2005-04-16 16:20:36 -06:00
|
|
|
/*
|
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|
|
* Driver for the PSC of the Freescale MPC52xx PSCs configured as UARTs.
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*
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* FIXME According to the usermanual the status bits in the status register
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* are only updated when the peripherals access the FIFO and not when the
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* CPU access them. So since we use this bits to know when we stop writing
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* and reading, they may not be updated in-time and a race condition may
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* exists. But I haven't be able to prove this and I don't care. But if
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* any problem arises, it might worth checking. The TX/RX FIFO Stats
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* registers should be used in addition.
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* Update: Actually, they seem updated ... At least the bits we use.
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*
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*
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* Maintainer : Sylvain Munaut <tnt@246tNt.com>
|
2006-11-27 14:21:01 -07:00
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*
|
2005-04-16 16:20:36 -06:00
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* Some of the code has been inspired/copied from the 2.4 code written
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|
|
* by Dale Farnsworth <dfarnsworth@mvista.com>.
|
2006-11-27 14:21:01 -07:00
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*
|
2008-01-28 10:28:56 -07:00
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* Copyright (C) 2008 Freescale Semiconductor Inc.
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* John Rigby <jrigby@gmail.com>
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|
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* Added support for MPC5121
|
2006-11-27 14:21:02 -07:00
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* Copyright (C) 2006 Secret Lab Technologies Ltd.
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* Grant Likely <grant.likely@secretlab.ca>
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* Copyright (C) 2004-2006 Sylvain Munaut <tnt@246tNt.com>
|
2005-04-16 16:20:36 -06:00
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* Copyright (C) 2003 MontaVista, Software, Inc.
|
2006-11-27 14:21:01 -07:00
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*
|
2005-04-16 16:20:36 -06:00
|
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|
* This file is licensed under the terms of the GNU General Public License
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|
|
* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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|
*/
|
2006-11-27 14:21:01 -07:00
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2006-11-27 14:21:02 -07:00
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|
#undef DEBUG
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#include <linux/device.h>
|
2005-04-16 16:20:36 -06:00
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#include <linux/module.h>
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|
|
#include <linux/tty.h>
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|
|
#include <linux/serial.h>
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#include <linux/sysrq.h>
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|
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#include <linux/console.h>
|
2008-01-16 14:37:25 -07:00
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|
#include <linux/delay.h>
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|
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#include <linux/io.h>
|
2008-01-08 12:20:40 -07:00
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|
#include <linux/of.h>
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|
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#include <linux/of_platform.h>
|
2010-02-16 22:30:03 -07:00
|
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|
#include <linux/clk.h>
|
2006-11-27 14:21:02 -07:00
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|
2005-04-16 16:20:36 -06:00
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|
#include <asm/mpc52xx.h>
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|
#include <asm/mpc52xx_psc.h>
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|
|
#if defined(CONFIG_SERIAL_MPC52xx_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
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|
|
#define SUPPORT_SYSRQ
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|
|
#endif
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|
#include <linux/serial_core.h>
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|
2006-01-06 01:11:32 -07:00
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|
|
/* We've been assigned a range on the "Low-density serial ports" major */
|
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|
|
#define SERIAL_PSC_MAJOR 204
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|
|
#define SERIAL_PSC_MINOR 148
|
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|
|
|
2005-04-16 16:20:36 -06:00
|
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|
|
|
|
#define ISR_PASS_LIMIT 256 /* Max number of iteration in the interrupt */
|
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|
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|
|
|
|
|
|
static struct uart_port mpc52xx_uart_ports[MPC52xx_PSC_MAXNUM];
|
|
|
|
/* Rem: - We use the read_status_mask as a shadow of
|
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|
|
* psc->mpc52xx_psc_imr
|
|
|
|
* - It's important that is array is all zero on start as we
|
|
|
|
* use it to know if it's initialized or not ! If it's not sure
|
|
|
|
* it's cleared, then a memset(...,0,...) should be added to
|
|
|
|
* the console_init
|
|
|
|
*/
|
2008-08-01 10:09:34 -06:00
|
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|
|
2006-11-27 14:21:02 -07:00
|
|
|
/* lookup table for matching device nodes to index numbers */
|
|
|
|
static struct device_node *mpc52xx_uart_nodes[MPC52xx_PSC_MAXNUM];
|
|
|
|
|
|
|
|
static void mpc52xx_uart_of_enumerate(void);
|
2005-04-16 16:20:36 -06:00
|
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|
|
2008-01-28 10:28:55 -07:00
|
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|
|
2005-04-16 16:20:36 -06:00
|
|
|
#define PSC(port) ((struct mpc52xx_psc __iomem *)((port)->membase))
|
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|
|
|
|
|
|
|
|
|
|
/* Forward declaration of the interruption handling routine */
|
2008-01-16 14:37:25 -07:00
|
|
|
static irqreturn_t mpc52xx_uart_int(int irq, void *dev_id);
|
2010-02-16 22:30:03 -07:00
|
|
|
static irqreturn_t mpc5xxx_uart_process_int(struct uart_port *port);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
|
|
|
|
/* Simple macro to test if a port is console or not. This one is taken
|
|
|
|
* for serial_core.c and maybe should be moved to serial_core.h ? */
|
|
|
|
#ifdef CONFIG_SERIAL_CORE_CONSOLE
|
2008-01-16 14:37:25 -07:00
|
|
|
#define uart_console(port) \
|
|
|
|
((port)->cons && (port)->cons->index == (port)->line)
|
2005-04-16 16:20:36 -06:00
|
|
|
#else
|
|
|
|
#define uart_console(port) (0)
|
|
|
|
#endif
|
|
|
|
|
2008-01-28 10:28:55 -07:00
|
|
|
/* ======================================================================== */
|
|
|
|
/* PSC fifo operations for isolating differences between 52xx and 512x */
|
|
|
|
/* ======================================================================== */
|
|
|
|
|
|
|
|
struct psc_ops {
|
|
|
|
void (*fifo_init)(struct uart_port *port);
|
|
|
|
int (*raw_rx_rdy)(struct uart_port *port);
|
|
|
|
int (*raw_tx_rdy)(struct uart_port *port);
|
|
|
|
int (*rx_rdy)(struct uart_port *port);
|
|
|
|
int (*tx_rdy)(struct uart_port *port);
|
|
|
|
int (*tx_empty)(struct uart_port *port);
|
|
|
|
void (*stop_rx)(struct uart_port *port);
|
|
|
|
void (*start_tx)(struct uart_port *port);
|
|
|
|
void (*stop_tx)(struct uart_port *port);
|
|
|
|
void (*rx_clr_irq)(struct uart_port *port);
|
|
|
|
void (*tx_clr_irq)(struct uart_port *port);
|
|
|
|
void (*write_char)(struct uart_port *port, unsigned char c);
|
|
|
|
unsigned char (*read_char)(struct uart_port *port);
|
|
|
|
void (*cw_disable_ints)(struct uart_port *port);
|
|
|
|
void (*cw_restore_ints)(struct uart_port *port);
|
2010-04-26 05:18:12 -06:00
|
|
|
unsigned int (*set_baudrate)(struct uart_port *port,
|
|
|
|
struct ktermios *new,
|
|
|
|
struct ktermios *old);
|
2010-02-16 22:30:03 -07:00
|
|
|
int (*clock)(struct uart_port *port, int enable);
|
|
|
|
int (*fifoc_init)(void);
|
|
|
|
void (*fifoc_uninit)(void);
|
|
|
|
void (*get_irq)(struct uart_port *, struct device_node *);
|
|
|
|
irqreturn_t (*handle_irq)(struct uart_port *port);
|
2008-01-28 10:28:55 -07:00
|
|
|
};
|
|
|
|
|
2010-04-26 05:18:12 -06:00
|
|
|
/* setting the prescaler and divisor reg is common for all chips */
|
|
|
|
static inline void mpc52xx_set_divisor(struct mpc52xx_psc __iomem *psc,
|
|
|
|
u16 prescaler, unsigned int divisor)
|
|
|
|
{
|
|
|
|
/* select prescaler */
|
|
|
|
out_be16(&psc->mpc52xx_psc_clock_select, prescaler);
|
|
|
|
out_8(&psc->ctur, divisor >> 8);
|
|
|
|
out_8(&psc->ctlr, divisor & 0xff);
|
|
|
|
}
|
|
|
|
|
2008-01-28 10:28:56 -07:00
|
|
|
#ifdef CONFIG_PPC_MPC52xx
|
2008-01-28 10:28:55 -07:00
|
|
|
#define FIFO_52xx(port) ((struct mpc52xx_psc_fifo __iomem *)(PSC(port)+1))
|
|
|
|
static void mpc52xx_psc_fifo_init(struct uart_port *port)
|
|
|
|
{
|
|
|
|
struct mpc52xx_psc __iomem *psc = PSC(port);
|
|
|
|
struct mpc52xx_psc_fifo __iomem *fifo = FIFO_52xx(port);
|
|
|
|
|
|
|
|
out_8(&fifo->rfcntl, 0x00);
|
|
|
|
out_be16(&fifo->rfalarm, 0x1ff);
|
|
|
|
out_8(&fifo->tfcntl, 0x07);
|
|
|
|
out_be16(&fifo->tfalarm, 0x80);
|
|
|
|
|
|
|
|
port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY;
|
|
|
|
out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int mpc52xx_psc_raw_rx_rdy(struct uart_port *port)
|
|
|
|
{
|
|
|
|
return in_be16(&PSC(port)->mpc52xx_psc_status)
|
|
|
|
& MPC52xx_PSC_SR_RXRDY;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int mpc52xx_psc_raw_tx_rdy(struct uart_port *port)
|
|
|
|
{
|
|
|
|
return in_be16(&PSC(port)->mpc52xx_psc_status)
|
|
|
|
& MPC52xx_PSC_SR_TXRDY;
|
|
|
|
}
|
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|
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|
|
|
|
|
|
|
static int mpc52xx_psc_rx_rdy(struct uart_port *port)
|
|
|
|
{
|
|
|
|
return in_be16(&PSC(port)->mpc52xx_psc_isr)
|
|
|
|
& port->read_status_mask
|
|
|
|
& MPC52xx_PSC_IMR_RXRDY;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int mpc52xx_psc_tx_rdy(struct uart_port *port)
|
|
|
|
{
|
|
|
|
return in_be16(&PSC(port)->mpc52xx_psc_isr)
|
|
|
|
& port->read_status_mask
|
|
|
|
& MPC52xx_PSC_IMR_TXRDY;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int mpc52xx_psc_tx_empty(struct uart_port *port)
|
|
|
|
{
|
|
|
|
return in_be16(&PSC(port)->mpc52xx_psc_status)
|
|
|
|
& MPC52xx_PSC_SR_TXEMP;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mpc52xx_psc_start_tx(struct uart_port *port)
|
|
|
|
{
|
|
|
|
port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY;
|
|
|
|
out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mpc52xx_psc_stop_tx(struct uart_port *port)
|
|
|
|
{
|
|
|
|
port->read_status_mask &= ~MPC52xx_PSC_IMR_TXRDY;
|
|
|
|
out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mpc52xx_psc_stop_rx(struct uart_port *port)
|
|
|
|
{
|
|
|
|
port->read_status_mask &= ~MPC52xx_PSC_IMR_RXRDY;
|
|
|
|
out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mpc52xx_psc_rx_clr_irq(struct uart_port *port)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mpc52xx_psc_tx_clr_irq(struct uart_port *port)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mpc52xx_psc_write_char(struct uart_port *port, unsigned char c)
|
|
|
|
{
|
|
|
|
out_8(&PSC(port)->mpc52xx_psc_buffer_8, c);
|
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned char mpc52xx_psc_read_char(struct uart_port *port)
|
|
|
|
{
|
|
|
|
return in_8(&PSC(port)->mpc52xx_psc_buffer_8);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mpc52xx_psc_cw_disable_ints(struct uart_port *port)
|
|
|
|
{
|
|
|
|
out_be16(&PSC(port)->mpc52xx_psc_imr, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mpc52xx_psc_cw_restore_ints(struct uart_port *port)
|
|
|
|
{
|
|
|
|
out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
|
|
|
|
}
|
|
|
|
|
2010-04-26 05:18:12 -06:00
|
|
|
static unsigned int mpc5200_psc_set_baudrate(struct uart_port *port,
|
|
|
|
struct ktermios *new,
|
|
|
|
struct ktermios *old)
|
2008-01-28 10:28:55 -07:00
|
|
|
{
|
2010-04-26 05:18:12 -06:00
|
|
|
unsigned int baud;
|
|
|
|
unsigned int divisor;
|
|
|
|
|
|
|
|
/* The 5200 has a fixed /32 prescaler, uartclk contains the ipb freq */
|
|
|
|
baud = uart_get_baud_rate(port, new, old,
|
|
|
|
port->uartclk / (32 * 0xffff) + 1,
|
|
|
|
port->uartclk / 32);
|
|
|
|
divisor = (port->uartclk + 16 * baud) / (32 * baud);
|
|
|
|
|
|
|
|
/* enable the /32 prescaler and set the divisor */
|
|
|
|
mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
|
|
|
|
return baud;
|
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned int mpc5200b_psc_set_baudrate(struct uart_port *port,
|
|
|
|
struct ktermios *new,
|
|
|
|
struct ktermios *old)
|
|
|
|
{
|
|
|
|
unsigned int baud;
|
|
|
|
unsigned int divisor;
|
|
|
|
u16 prescaler;
|
|
|
|
|
|
|
|
/* The 5200B has a selectable /4 or /32 prescaler, uartclk contains the
|
|
|
|
* ipb freq */
|
|
|
|
baud = uart_get_baud_rate(port, new, old,
|
|
|
|
port->uartclk / (32 * 0xffff) + 1,
|
|
|
|
port->uartclk / 4);
|
|
|
|
divisor = (port->uartclk + 2 * baud) / (4 * baud);
|
|
|
|
|
|
|
|
/* select the proper prescaler and set the divisor */
|
|
|
|
if (divisor > 0xffff) {
|
|
|
|
divisor = (divisor + 4) / 8;
|
|
|
|
prescaler = 0xdd00; /* /32 */
|
|
|
|
} else
|
|
|
|
prescaler = 0xff00; /* /4 */
|
|
|
|
mpc52xx_set_divisor(PSC(port), prescaler, divisor);
|
|
|
|
return baud;
|
2008-01-28 10:28:55 -07:00
|
|
|
}
|
|
|
|
|
2010-02-16 22:30:03 -07:00
|
|
|
static void mpc52xx_psc_get_irq(struct uart_port *port, struct device_node *np)
|
|
|
|
{
|
|
|
|
port->irqflags = IRQF_DISABLED;
|
|
|
|
port->irq = irq_of_parse_and_map(np, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* 52xx specific interrupt handler. The caller holds the port lock */
|
|
|
|
static irqreturn_t mpc52xx_psc_handle_irq(struct uart_port *port)
|
|
|
|
{
|
|
|
|
return mpc5xxx_uart_process_int(port);
|
|
|
|
}
|
|
|
|
|
2008-01-28 10:28:55 -07:00
|
|
|
static struct psc_ops mpc52xx_psc_ops = {
|
|
|
|
.fifo_init = mpc52xx_psc_fifo_init,
|
|
|
|
.raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
|
|
|
|
.raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
|
|
|
|
.rx_rdy = mpc52xx_psc_rx_rdy,
|
|
|
|
.tx_rdy = mpc52xx_psc_tx_rdy,
|
|
|
|
.tx_empty = mpc52xx_psc_tx_empty,
|
|
|
|
.stop_rx = mpc52xx_psc_stop_rx,
|
|
|
|
.start_tx = mpc52xx_psc_start_tx,
|
|
|
|
.stop_tx = mpc52xx_psc_stop_tx,
|
|
|
|
.rx_clr_irq = mpc52xx_psc_rx_clr_irq,
|
|
|
|
.tx_clr_irq = mpc52xx_psc_tx_clr_irq,
|
|
|
|
.write_char = mpc52xx_psc_write_char,
|
|
|
|
.read_char = mpc52xx_psc_read_char,
|
|
|
|
.cw_disable_ints = mpc52xx_psc_cw_disable_ints,
|
|
|
|
.cw_restore_ints = mpc52xx_psc_cw_restore_ints,
|
2010-04-26 05:18:12 -06:00
|
|
|
.set_baudrate = mpc5200_psc_set_baudrate,
|
|
|
|
.get_irq = mpc52xx_psc_get_irq,
|
|
|
|
.handle_irq = mpc52xx_psc_handle_irq,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct psc_ops mpc5200b_psc_ops = {
|
|
|
|
.fifo_init = mpc52xx_psc_fifo_init,
|
|
|
|
.raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
|
|
|
|
.raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
|
|
|
|
.rx_rdy = mpc52xx_psc_rx_rdy,
|
|
|
|
.tx_rdy = mpc52xx_psc_tx_rdy,
|
|
|
|
.tx_empty = mpc52xx_psc_tx_empty,
|
|
|
|
.stop_rx = mpc52xx_psc_stop_rx,
|
|
|
|
.start_tx = mpc52xx_psc_start_tx,
|
|
|
|
.stop_tx = mpc52xx_psc_stop_tx,
|
|
|
|
.rx_clr_irq = mpc52xx_psc_rx_clr_irq,
|
|
|
|
.tx_clr_irq = mpc52xx_psc_tx_clr_irq,
|
|
|
|
.write_char = mpc52xx_psc_write_char,
|
|
|
|
.read_char = mpc52xx_psc_read_char,
|
|
|
|
.cw_disable_ints = mpc52xx_psc_cw_disable_ints,
|
|
|
|
.cw_restore_ints = mpc52xx_psc_cw_restore_ints,
|
|
|
|
.set_baudrate = mpc5200b_psc_set_baudrate,
|
2010-02-16 22:30:03 -07:00
|
|
|
.get_irq = mpc52xx_psc_get_irq,
|
|
|
|
.handle_irq = mpc52xx_psc_handle_irq,
|
2008-01-28 10:28:55 -07:00
|
|
|
};
|
|
|
|
|
2008-01-28 10:28:56 -07:00
|
|
|
#endif /* CONFIG_MPC52xx */
|
|
|
|
|
|
|
|
#ifdef CONFIG_PPC_MPC512x
|
|
|
|
#define FIFO_512x(port) ((struct mpc512x_psc_fifo __iomem *)(PSC(port)+1))
|
2010-02-16 22:30:03 -07:00
|
|
|
|
|
|
|
/* PSC FIFO Controller for mpc512x */
|
|
|
|
struct psc_fifoc {
|
|
|
|
u32 fifoc_cmd;
|
|
|
|
u32 fifoc_int;
|
|
|
|
u32 fifoc_dma;
|
|
|
|
u32 fifoc_axe;
|
|
|
|
u32 fifoc_debug;
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct psc_fifoc __iomem *psc_fifoc;
|
|
|
|
static unsigned int psc_fifoc_irq;
|
|
|
|
|
2008-01-28 10:28:56 -07:00
|
|
|
static void mpc512x_psc_fifo_init(struct uart_port *port)
|
|
|
|
{
|
2010-02-16 22:30:03 -07:00
|
|
|
/* /32 prescaler */
|
|
|
|
out_be16(&PSC(port)->mpc52xx_psc_clock_select, 0xdd00);
|
|
|
|
|
2008-01-28 10:28:56 -07:00
|
|
|
out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE);
|
|
|
|
out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
|
|
|
|
out_be32(&FIFO_512x(port)->txalarm, 1);
|
|
|
|
out_be32(&FIFO_512x(port)->tximr, 0);
|
|
|
|
|
|
|
|
out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE);
|
|
|
|
out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
|
|
|
|
out_be32(&FIFO_512x(port)->rxalarm, 1);
|
|
|
|
out_be32(&FIFO_512x(port)->rximr, 0);
|
|
|
|
|
|
|
|
out_be32(&FIFO_512x(port)->tximr, MPC512x_PSC_FIFO_ALARM);
|
|
|
|
out_be32(&FIFO_512x(port)->rximr, MPC512x_PSC_FIFO_ALARM);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int mpc512x_psc_raw_rx_rdy(struct uart_port *port)
|
|
|
|
{
|
|
|
|
return !(in_be32(&FIFO_512x(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int mpc512x_psc_raw_tx_rdy(struct uart_port *port)
|
|
|
|
{
|
|
|
|
return !(in_be32(&FIFO_512x(port)->txsr) & MPC512x_PSC_FIFO_FULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int mpc512x_psc_rx_rdy(struct uart_port *port)
|
|
|
|
{
|
|
|
|
return in_be32(&FIFO_512x(port)->rxsr)
|
|
|
|
& in_be32(&FIFO_512x(port)->rximr)
|
|
|
|
& MPC512x_PSC_FIFO_ALARM;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int mpc512x_psc_tx_rdy(struct uart_port *port)
|
|
|
|
{
|
|
|
|
return in_be32(&FIFO_512x(port)->txsr)
|
|
|
|
& in_be32(&FIFO_512x(port)->tximr)
|
|
|
|
& MPC512x_PSC_FIFO_ALARM;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int mpc512x_psc_tx_empty(struct uart_port *port)
|
|
|
|
{
|
|
|
|
return in_be32(&FIFO_512x(port)->txsr)
|
|
|
|
& MPC512x_PSC_FIFO_EMPTY;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mpc512x_psc_stop_rx(struct uart_port *port)
|
|
|
|
{
|
|
|
|
unsigned long rx_fifo_imr;
|
|
|
|
|
|
|
|
rx_fifo_imr = in_be32(&FIFO_512x(port)->rximr);
|
|
|
|
rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
|
|
|
|
out_be32(&FIFO_512x(port)->rximr, rx_fifo_imr);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mpc512x_psc_start_tx(struct uart_port *port)
|
|
|
|
{
|
|
|
|
unsigned long tx_fifo_imr;
|
|
|
|
|
|
|
|
tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
|
|
|
|
tx_fifo_imr |= MPC512x_PSC_FIFO_ALARM;
|
|
|
|
out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mpc512x_psc_stop_tx(struct uart_port *port)
|
|
|
|
{
|
|
|
|
unsigned long tx_fifo_imr;
|
|
|
|
|
|
|
|
tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
|
|
|
|
tx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
|
|
|
|
out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mpc512x_psc_rx_clr_irq(struct uart_port *port)
|
|
|
|
{
|
|
|
|
out_be32(&FIFO_512x(port)->rxisr, in_be32(&FIFO_512x(port)->rxisr));
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mpc512x_psc_tx_clr_irq(struct uart_port *port)
|
|
|
|
{
|
|
|
|
out_be32(&FIFO_512x(port)->txisr, in_be32(&FIFO_512x(port)->txisr));
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mpc512x_psc_write_char(struct uart_port *port, unsigned char c)
|
|
|
|
{
|
|
|
|
out_8(&FIFO_512x(port)->txdata_8, c);
|
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned char mpc512x_psc_read_char(struct uart_port *port)
|
|
|
|
{
|
|
|
|
return in_8(&FIFO_512x(port)->rxdata_8);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mpc512x_psc_cw_disable_ints(struct uart_port *port)
|
|
|
|
{
|
|
|
|
port->read_status_mask =
|
|
|
|
in_be32(&FIFO_512x(port)->tximr) << 16 |
|
|
|
|
in_be32(&FIFO_512x(port)->rximr);
|
|
|
|
out_be32(&FIFO_512x(port)->tximr, 0);
|
|
|
|
out_be32(&FIFO_512x(port)->rximr, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mpc512x_psc_cw_restore_ints(struct uart_port *port)
|
|
|
|
{
|
|
|
|
out_be32(&FIFO_512x(port)->tximr,
|
|
|
|
(port->read_status_mask >> 16) & 0x7f);
|
|
|
|
out_be32(&FIFO_512x(port)->rximr, port->read_status_mask & 0x7f);
|
|
|
|
}
|
|
|
|
|
2010-04-26 05:18:12 -06:00
|
|
|
static unsigned int mpc512x_psc_set_baudrate(struct uart_port *port,
|
|
|
|
struct ktermios *new,
|
|
|
|
struct ktermios *old)
|
2008-01-28 10:28:56 -07:00
|
|
|
{
|
2010-04-26 05:18:12 -06:00
|
|
|
unsigned int baud;
|
|
|
|
unsigned int divisor;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The "MPC5121e Microcontroller Reference Manual, Rev. 3" says on
|
|
|
|
* pg. 30-10 that the chip supports a /32 and a /10 prescaler.
|
|
|
|
* Furthermore, it states that "After reset, the prescaler by 10
|
|
|
|
* for the UART mode is selected", but the reset register value is
|
|
|
|
* 0x0000 which means a /32 prescaler. This is wrong.
|
|
|
|
*
|
|
|
|
* In reality using /32 prescaler doesn't work, as it is not supported!
|
|
|
|
* Use /16 or /10 prescaler, see "MPC5121e Hardware Design Guide",
|
|
|
|
* Chapter 4.1 PSC in UART Mode.
|
|
|
|
* Calculate with a /16 prescaler here.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* uartclk contains the ips freq */
|
|
|
|
baud = uart_get_baud_rate(port, new, old,
|
|
|
|
port->uartclk / (16 * 0xffff) + 1,
|
|
|
|
port->uartclk / 16);
|
|
|
|
divisor = (port->uartclk + 8 * baud) / (16 * baud);
|
|
|
|
|
|
|
|
/* enable the /16 prescaler and set the divisor */
|
|
|
|
mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
|
|
|
|
return baud;
|
2008-01-28 10:28:56 -07:00
|
|
|
}
|
|
|
|
|
2010-02-16 22:30:03 -07:00
|
|
|
/* Init PSC FIFO Controller */
|
|
|
|
static int __init mpc512x_psc_fifoc_init(void)
|
|
|
|
{
|
|
|
|
struct device_node *np;
|
|
|
|
|
|
|
|
np = of_find_compatible_node(NULL, NULL,
|
|
|
|
"fsl,mpc5121-psc-fifo");
|
|
|
|
if (!np) {
|
|
|
|
pr_err("%s: Can't find FIFOC node\n", __func__);
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
psc_fifoc = of_iomap(np, 0);
|
|
|
|
if (!psc_fifoc) {
|
|
|
|
pr_err("%s: Can't map FIFOC\n", __func__);
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
psc_fifoc_irq = irq_of_parse_and_map(np, 0);
|
|
|
|
of_node_put(np);
|
|
|
|
if (psc_fifoc_irq == NO_IRQ) {
|
|
|
|
pr_err("%s: Can't get FIFOC irq\n", __func__);
|
|
|
|
iounmap(psc_fifoc);
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit mpc512x_psc_fifoc_uninit(void)
|
|
|
|
{
|
|
|
|
iounmap(psc_fifoc);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* 512x specific interrupt handler. The caller holds the port lock */
|
|
|
|
static irqreturn_t mpc512x_psc_handle_irq(struct uart_port *port)
|
|
|
|
{
|
|
|
|
unsigned long fifoc_int;
|
|
|
|
int psc_num;
|
|
|
|
|
|
|
|
/* Read pending PSC FIFOC interrupts */
|
|
|
|
fifoc_int = in_be32(&psc_fifoc->fifoc_int);
|
|
|
|
|
|
|
|
/* Check if it is an interrupt for this port */
|
|
|
|
psc_num = (port->mapbase & 0xf00) >> 8;
|
|
|
|
if (test_bit(psc_num, &fifoc_int) ||
|
|
|
|
test_bit(psc_num + 16, &fifoc_int))
|
|
|
|
return mpc5xxx_uart_process_int(port);
|
|
|
|
|
|
|
|
return IRQ_NONE;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int mpc512x_psc_clock(struct uart_port *port, int enable)
|
|
|
|
{
|
|
|
|
struct clk *psc_clk;
|
|
|
|
int psc_num;
|
|
|
|
char clk_name[10];
|
|
|
|
|
|
|
|
if (uart_console(port))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
psc_num = (port->mapbase & 0xf00) >> 8;
|
|
|
|
snprintf(clk_name, sizeof(clk_name), "psc%d_clk", psc_num);
|
|
|
|
psc_clk = clk_get(port->dev, clk_name);
|
|
|
|
if (IS_ERR(psc_clk)) {
|
|
|
|
dev_err(port->dev, "Failed to get PSC clock entry!\n");
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
dev_dbg(port->dev, "%s %sable\n", clk_name, enable ? "en" : "dis");
|
|
|
|
|
|
|
|
if (enable)
|
|
|
|
clk_enable(psc_clk);
|
|
|
|
else
|
|
|
|
clk_disable(psc_clk);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mpc512x_psc_get_irq(struct uart_port *port, struct device_node *np)
|
|
|
|
{
|
|
|
|
port->irqflags = IRQF_SHARED;
|
|
|
|
port->irq = psc_fifoc_irq;
|
|
|
|
}
|
|
|
|
|
2008-01-28 10:28:56 -07:00
|
|
|
static struct psc_ops mpc512x_psc_ops = {
|
|
|
|
.fifo_init = mpc512x_psc_fifo_init,
|
|
|
|
.raw_rx_rdy = mpc512x_psc_raw_rx_rdy,
|
|
|
|
.raw_tx_rdy = mpc512x_psc_raw_tx_rdy,
|
|
|
|
.rx_rdy = mpc512x_psc_rx_rdy,
|
|
|
|
.tx_rdy = mpc512x_psc_tx_rdy,
|
|
|
|
.tx_empty = mpc512x_psc_tx_empty,
|
|
|
|
.stop_rx = mpc512x_psc_stop_rx,
|
|
|
|
.start_tx = mpc512x_psc_start_tx,
|
|
|
|
.stop_tx = mpc512x_psc_stop_tx,
|
|
|
|
.rx_clr_irq = mpc512x_psc_rx_clr_irq,
|
|
|
|
.tx_clr_irq = mpc512x_psc_tx_clr_irq,
|
|
|
|
.write_char = mpc512x_psc_write_char,
|
|
|
|
.read_char = mpc512x_psc_read_char,
|
|
|
|
.cw_disable_ints = mpc512x_psc_cw_disable_ints,
|
|
|
|
.cw_restore_ints = mpc512x_psc_cw_restore_ints,
|
2010-04-26 05:18:12 -06:00
|
|
|
.set_baudrate = mpc512x_psc_set_baudrate,
|
2010-02-16 22:30:03 -07:00
|
|
|
.clock = mpc512x_psc_clock,
|
|
|
|
.fifoc_init = mpc512x_psc_fifoc_init,
|
|
|
|
.fifoc_uninit = mpc512x_psc_fifoc_uninit,
|
|
|
|
.get_irq = mpc512x_psc_get_irq,
|
|
|
|
.handle_irq = mpc512x_psc_handle_irq,
|
2008-01-28 10:28:56 -07:00
|
|
|
};
|
|
|
|
#endif
|
|
|
|
|
|
|
|
static struct psc_ops *psc_ops;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/* ======================================================================== */
|
|
|
|
/* UART operations */
|
|
|
|
/* ======================================================================== */
|
|
|
|
|
2006-11-27 14:21:01 -07:00
|
|
|
static unsigned int
|
2005-04-16 16:20:36 -06:00
|
|
|
mpc52xx_uart_tx_empty(struct uart_port *port)
|
|
|
|
{
|
2008-01-28 10:28:55 -07:00
|
|
|
return psc_ops->tx_empty(port) ? TIOCSER_TEMT : 0;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2006-11-27 14:21:01 -07:00
|
|
|
static void
|
2005-04-16 16:20:36 -06:00
|
|
|
mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
|
|
|
|
{
|
2008-12-21 02:54:32 -07:00
|
|
|
if (mctrl & TIOCM_RTS)
|
|
|
|
out_8(&PSC(port)->op1, MPC52xx_PSC_OP_RTS);
|
|
|
|
else
|
|
|
|
out_8(&PSC(port)->op0, MPC52xx_PSC_OP_RTS);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2006-11-27 14:21:01 -07:00
|
|
|
static unsigned int
|
2005-04-16 16:20:36 -06:00
|
|
|
mpc52xx_uart_get_mctrl(struct uart_port *port)
|
|
|
|
{
|
2008-12-21 02:54:32 -07:00
|
|
|
unsigned int ret = TIOCM_DSR;
|
|
|
|
u8 status = in_8(&PSC(port)->mpc52xx_psc_ipcr);
|
|
|
|
|
|
|
|
if (!(status & MPC52xx_PSC_CTS))
|
|
|
|
ret |= TIOCM_CTS;
|
|
|
|
if (!(status & MPC52xx_PSC_DCD))
|
|
|
|
ret |= TIOCM_CAR;
|
|
|
|
|
|
|
|
return ret;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2006-11-27 14:21:01 -07:00
|
|
|
static void
|
2005-08-31 03:12:14 -06:00
|
|
|
mpc52xx_uart_stop_tx(struct uart_port *port)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
/* port->lock taken by caller */
|
2008-01-28 10:28:55 -07:00
|
|
|
psc_ops->stop_tx(port);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2006-11-27 14:21:01 -07:00
|
|
|
static void
|
2005-08-31 03:12:14 -06:00
|
|
|
mpc52xx_uart_start_tx(struct uart_port *port)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
/* port->lock taken by caller */
|
2008-01-28 10:28:55 -07:00
|
|
|
psc_ops->start_tx(port);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2006-11-27 14:21:01 -07:00
|
|
|
static void
|
2005-04-16 16:20:36 -06:00
|
|
|
mpc52xx_uart_send_xchar(struct uart_port *port, char ch)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
2006-11-27 14:21:01 -07:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
port->x_char = ch;
|
|
|
|
if (ch) {
|
|
|
|
/* Make sure tx interrupts are on */
|
|
|
|
/* Truly necessary ??? They should be anyway */
|
2008-01-28 10:28:55 -07:00
|
|
|
psc_ops->start_tx(port);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
2006-11-27 14:21:01 -07:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
mpc52xx_uart_stop_rx(struct uart_port *port)
|
|
|
|
{
|
|
|
|
/* port->lock taken by caller */
|
2008-01-28 10:28:55 -07:00
|
|
|
psc_ops->stop_rx(port);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
mpc52xx_uart_enable_ms(struct uart_port *port)
|
|
|
|
{
|
2008-12-21 02:54:32 -07:00
|
|
|
struct mpc52xx_psc __iomem *psc = PSC(port);
|
|
|
|
|
|
|
|
/* clear D_*-bits by reading them */
|
|
|
|
in_8(&psc->mpc52xx_psc_ipcr);
|
|
|
|
/* enable CTS and DCD as IPC interrupts */
|
|
|
|
out_8(&psc->mpc52xx_psc_acr, MPC52xx_PSC_IEC_CTS | MPC52xx_PSC_IEC_DCD);
|
|
|
|
|
|
|
|
port->read_status_mask |= MPC52xx_PSC_IMR_IPC;
|
|
|
|
out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
mpc52xx_uart_break_ctl(struct uart_port *port, int ctl)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
|
|
|
2008-01-16 14:37:25 -07:00
|
|
|
if (ctl == -1)
|
|
|
|
out_8(&PSC(port)->command, MPC52xx_PSC_START_BRK);
|
2005-04-16 16:20:36 -06:00
|
|
|
else
|
2008-01-16 14:37:25 -07:00
|
|
|
out_8(&PSC(port)->command, MPC52xx_PSC_STOP_BRK);
|
2006-11-27 14:21:01 -07:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
mpc52xx_uart_startup(struct uart_port *port)
|
|
|
|
{
|
|
|
|
struct mpc52xx_psc __iomem *psc = PSC(port);
|
|
|
|
int ret;
|
|
|
|
|
2010-02-16 22:30:03 -07:00
|
|
|
if (psc_ops->clock) {
|
|
|
|
ret = psc_ops->clock(port, 1);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/* Request IRQ */
|
|
|
|
ret = request_irq(port->irq, mpc52xx_uart_int,
|
2010-02-16 22:30:03 -07:00
|
|
|
port->irqflags, "mpc52xx_psc_uart", port);
|
2005-04-16 16:20:36 -06:00
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
/* Reset/activate the port, clear and enable interrupts */
|
2008-01-16 14:37:25 -07:00
|
|
|
out_8(&psc->command, MPC52xx_PSC_RST_RX);
|
|
|
|
out_8(&psc->command, MPC52xx_PSC_RST_TX);
|
2006-11-27 14:21:01 -07:00
|
|
|
|
2008-01-16 14:37:25 -07:00
|
|
|
out_be32(&psc->sicr, 0); /* UART mode DCD ignored */
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2008-01-28 10:28:55 -07:00
|
|
|
psc_ops->fifo_init(port);
|
2006-11-27 14:21:01 -07:00
|
|
|
|
2008-01-16 14:37:25 -07:00
|
|
|
out_8(&psc->command, MPC52xx_PSC_TX_ENABLE);
|
|
|
|
out_8(&psc->command, MPC52xx_PSC_RX_ENABLE);
|
2006-11-27 14:21:01 -07:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
mpc52xx_uart_shutdown(struct uart_port *port)
|
|
|
|
{
|
|
|
|
struct mpc52xx_psc __iomem *psc = PSC(port);
|
2006-11-27 14:21:01 -07:00
|
|
|
|
2007-05-06 09:38:51 -06:00
|
|
|
/* Shut down the port. Leave TX active if on a console port */
|
2008-01-16 14:37:25 -07:00
|
|
|
out_8(&psc->command, MPC52xx_PSC_RST_RX);
|
2007-05-06 09:38:51 -06:00
|
|
|
if (!uart_console(port))
|
2008-01-16 14:37:25 -07:00
|
|
|
out_8(&psc->command, MPC52xx_PSC_RST_TX);
|
2006-11-27 14:21:01 -07:00
|
|
|
|
|
|
|
port->read_status_mask = 0;
|
2008-01-16 14:37:25 -07:00
|
|
|
out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2010-02-16 22:30:03 -07:00
|
|
|
if (psc_ops->clock)
|
|
|
|
psc_ops->clock(port, 0);
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/* Release interrupt */
|
|
|
|
free_irq(port->irq, port);
|
|
|
|
}
|
|
|
|
|
2006-11-27 14:21:01 -07:00
|
|
|
static void
|
2006-12-08 03:38:45 -07:00
|
|
|
mpc52xx_uart_set_termios(struct uart_port *port, struct ktermios *new,
|
2008-01-16 14:37:25 -07:00
|
|
|
struct ktermios *old)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
struct mpc52xx_psc __iomem *psc = PSC(port);
|
|
|
|
unsigned long flags;
|
|
|
|
unsigned char mr1, mr2;
|
2010-04-26 05:18:12 -06:00
|
|
|
unsigned int j;
|
|
|
|
unsigned int baud;
|
2006-11-27 14:21:01 -07:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/* Prepare what we're gonna write */
|
|
|
|
mr1 = 0;
|
2006-11-27 14:21:01 -07:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
switch (new->c_cflag & CSIZE) {
|
2008-01-16 14:37:25 -07:00
|
|
|
case CS5: mr1 |= MPC52xx_PSC_MODE_5_BITS;
|
|
|
|
break;
|
|
|
|
case CS6: mr1 |= MPC52xx_PSC_MODE_6_BITS;
|
|
|
|
break;
|
|
|
|
case CS7: mr1 |= MPC52xx_PSC_MODE_7_BITS;
|
|
|
|
break;
|
|
|
|
case CS8:
|
|
|
|
default: mr1 |= MPC52xx_PSC_MODE_8_BITS;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
if (new->c_cflag & PARENB) {
|
|
|
|
mr1 |= (new->c_cflag & PARODD) ?
|
|
|
|
MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN;
|
|
|
|
} else
|
|
|
|
mr1 |= MPC52xx_PSC_MODE_PARNONE;
|
2006-11-27 14:21:01 -07:00
|
|
|
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
mr2 = 0;
|
|
|
|
|
|
|
|
if (new->c_cflag & CSTOPB)
|
|
|
|
mr2 |= MPC52xx_PSC_MODE_TWO_STOP;
|
|
|
|
else
|
|
|
|
mr2 |= ((new->c_cflag & CSIZE) == CS5) ?
|
|
|
|
MPC52xx_PSC_MODE_ONE_STOP_5_BITS :
|
|
|
|
MPC52xx_PSC_MODE_ONE_STOP;
|
|
|
|
|
2008-12-21 02:54:32 -07:00
|
|
|
if (new->c_cflag & CRTSCTS) {
|
|
|
|
mr1 |= MPC52xx_PSC_MODE_RXRTS;
|
|
|
|
mr2 |= MPC52xx_PSC_MODE_TXCTS;
|
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/* Get the lock */
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
|
|
|
2008-12-05 09:34:46 -07:00
|
|
|
/* Do our best to flush TX & RX, so we don't lose anything */
|
|
|
|
/* But we don't wait indefinitely ! */
|
2005-04-16 16:20:36 -06:00
|
|
|
j = 5000000; /* Maximum wait */
|
|
|
|
/* FIXME Can't receive chars since set_termios might be called at early
|
|
|
|
* boot for the console, all stuff is not yet ready to receive at that
|
|
|
|
* time and that just makes the kernel oops */
|
|
|
|
/* while (j-- && mpc52xx_uart_int_rx_chars(port)); */
|
2008-01-28 10:28:55 -07:00
|
|
|
while (!mpc52xx_uart_tx_empty(port) && --j)
|
2005-04-16 16:20:36 -06:00
|
|
|
udelay(1);
|
|
|
|
|
|
|
|
if (!j)
|
2008-01-16 14:37:25 -07:00
|
|
|
printk(KERN_ERR "mpc52xx_uart.c: "
|
2005-04-16 16:20:36 -06:00
|
|
|
"Unable to flush RX & TX fifos in-time in set_termios."
|
2008-01-16 14:37:25 -07:00
|
|
|
"Some chars may have been lost.\n");
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/* Reset the TX & RX */
|
2008-01-16 14:37:25 -07:00
|
|
|
out_8(&psc->command, MPC52xx_PSC_RST_RX);
|
|
|
|
out_8(&psc->command, MPC52xx_PSC_RST_TX);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/* Send new mode settings */
|
2008-01-16 14:37:25 -07:00
|
|
|
out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
|
|
|
|
out_8(&psc->mode, mr1);
|
|
|
|
out_8(&psc->mode, mr2);
|
2010-04-26 05:18:12 -06:00
|
|
|
baud = psc_ops->set_baudrate(port, new, old);
|
|
|
|
|
|
|
|
/* Update the per-port timeout */
|
|
|
|
uart_update_timeout(port, new->c_cflag, baud);
|
2006-11-27 14:21:01 -07:00
|
|
|
|
2008-12-21 02:54:32 -07:00
|
|
|
if (UART_ENABLE_MS(port, new->c_cflag))
|
|
|
|
mpc52xx_uart_enable_ms(port);
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/* Reenable TX & RX */
|
2008-01-16 14:37:25 -07:00
|
|
|
out_8(&psc->command, MPC52xx_PSC_TX_ENABLE);
|
|
|
|
out_8(&psc->command, MPC52xx_PSC_RX_ENABLE);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/* We're all set, release the lock */
|
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
static const char *
|
|
|
|
mpc52xx_uart_type(struct uart_port *port)
|
|
|
|
{
|
|
|
|
return port->type == PORT_MPC52xx ? "MPC52xx PSC" : NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
mpc52xx_uart_release_port(struct uart_port *port)
|
|
|
|
{
|
2008-01-16 14:37:25 -07:00
|
|
|
/* remapped by us ? */
|
|
|
|
if (port->flags & UPF_IOREMAP) {
|
2005-04-16 16:20:36 -06:00
|
|
|
iounmap(port->membase);
|
|
|
|
port->membase = NULL;
|
|
|
|
}
|
|
|
|
|
2006-11-27 14:21:02 -07:00
|
|
|
release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
mpc52xx_uart_request_port(struct uart_port *port)
|
|
|
|
{
|
2006-10-01 00:29:23 -06:00
|
|
|
int err;
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
if (port->flags & UPF_IOREMAP) /* Need to remap ? */
|
2006-11-27 14:21:02 -07:00
|
|
|
port->membase = ioremap(port->mapbase,
|
2008-01-16 14:37:25 -07:00
|
|
|
sizeof(struct mpc52xx_psc));
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
if (!port->membase)
|
|
|
|
return -EINVAL;
|
|
|
|
|
2006-11-27 14:21:02 -07:00
|
|
|
err = request_mem_region(port->mapbase, sizeof(struct mpc52xx_psc),
|
2005-04-16 16:20:36 -06:00
|
|
|
"mpc52xx_psc_uart") != NULL ? 0 : -EBUSY;
|
2006-10-01 00:29:23 -06:00
|
|
|
|
|
|
|
if (err && (port->flags & UPF_IOREMAP)) {
|
|
|
|
iounmap(port->membase);
|
|
|
|
port->membase = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
return err;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
mpc52xx_uart_config_port(struct uart_port *port, int flags)
|
|
|
|
{
|
2008-01-16 14:37:25 -07:00
|
|
|
if ((flags & UART_CONFIG_TYPE)
|
|
|
|
&& (mpc52xx_uart_request_port(port) == 0))
|
|
|
|
port->type = PORT_MPC52xx;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
|
|
|
|
{
|
2008-01-16 14:37:25 -07:00
|
|
|
if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPC52xx)
|
2005-04-16 16:20:36 -06:00
|
|
|
return -EINVAL;
|
|
|
|
|
2008-01-16 14:37:25 -07:00
|
|
|
if ((ser->irq != port->irq) ||
|
2009-10-15 09:58:28 -06:00
|
|
|
(ser->io_type != UPIO_MEM) ||
|
2008-01-16 14:37:25 -07:00
|
|
|
(ser->baud_base != port->uartclk) ||
|
|
|
|
(ser->iomem_base != (void *)port->mapbase) ||
|
|
|
|
(ser->hub6 != 0))
|
2005-04-16 16:20:36 -06:00
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static struct uart_ops mpc52xx_uart_ops = {
|
|
|
|
.tx_empty = mpc52xx_uart_tx_empty,
|
|
|
|
.set_mctrl = mpc52xx_uart_set_mctrl,
|
|
|
|
.get_mctrl = mpc52xx_uart_get_mctrl,
|
|
|
|
.stop_tx = mpc52xx_uart_stop_tx,
|
|
|
|
.start_tx = mpc52xx_uart_start_tx,
|
|
|
|
.send_xchar = mpc52xx_uart_send_xchar,
|
|
|
|
.stop_rx = mpc52xx_uart_stop_rx,
|
|
|
|
.enable_ms = mpc52xx_uart_enable_ms,
|
|
|
|
.break_ctl = mpc52xx_uart_break_ctl,
|
|
|
|
.startup = mpc52xx_uart_startup,
|
|
|
|
.shutdown = mpc52xx_uart_shutdown,
|
|
|
|
.set_termios = mpc52xx_uart_set_termios,
|
|
|
|
/* .pm = mpc52xx_uart_pm, Not supported yet */
|
|
|
|
/* .set_wake = mpc52xx_uart_set_wake, Not supported yet */
|
|
|
|
.type = mpc52xx_uart_type,
|
|
|
|
.release_port = mpc52xx_uart_release_port,
|
|
|
|
.request_port = mpc52xx_uart_request_port,
|
|
|
|
.config_port = mpc52xx_uart_config_port,
|
|
|
|
.verify_port = mpc52xx_uart_verify_port
|
|
|
|
};
|
|
|
|
|
2006-11-27 14:21:01 -07:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/* ======================================================================== */
|
|
|
|
/* Interrupt handling */
|
|
|
|
/* ======================================================================== */
|
2006-11-27 14:21:01 -07:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
static inline int
|
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 07:55:46 -06:00
|
|
|
mpc52xx_uart_int_rx_chars(struct uart_port *port)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2009-09-19 14:13:28 -06:00
|
|
|
struct tty_struct *tty = port->state->port.tty;
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-09 21:54:13 -07:00
|
|
|
unsigned char ch, flag;
|
2005-04-16 16:20:36 -06:00
|
|
|
unsigned short status;
|
|
|
|
|
|
|
|
/* While we can read, do so ! */
|
2008-01-28 10:28:55 -07:00
|
|
|
while (psc_ops->raw_rx_rdy(port)) {
|
2005-04-16 16:20:36 -06:00
|
|
|
/* Get the char */
|
2008-01-28 10:28:55 -07:00
|
|
|
ch = psc_ops->read_char(port);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/* Handle sysreq char */
|
|
|
|
#ifdef SUPPORT_SYSRQ
|
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 07:55:46 -06:00
|
|
|
if (uart_handle_sysrq_char(port, ch)) {
|
2005-04-16 16:20:36 -06:00
|
|
|
port->sysrq = 0;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* Store it */
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-09 21:54:13 -07:00
|
|
|
|
|
|
|
flag = TTY_NORMAL;
|
2005-04-16 16:20:36 -06:00
|
|
|
port->icount.rx++;
|
2006-11-27 14:21:01 -07:00
|
|
|
|
2008-01-28 10:28:55 -07:00
|
|
|
status = in_be16(&PSC(port)->mpc52xx_psc_status);
|
|
|
|
|
2008-01-16 14:37:25 -07:00
|
|
|
if (status & (MPC52xx_PSC_SR_PE |
|
|
|
|
MPC52xx_PSC_SR_FE |
|
|
|
|
MPC52xx_PSC_SR_RB)) {
|
2006-11-27 14:21:01 -07:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
if (status & MPC52xx_PSC_SR_RB) {
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-09 21:54:13 -07:00
|
|
|
flag = TTY_BREAK;
|
2005-04-16 16:20:36 -06:00
|
|
|
uart_handle_break(port);
|
2008-12-21 02:54:31 -07:00
|
|
|
port->icount.brk++;
|
|
|
|
} else if (status & MPC52xx_PSC_SR_PE) {
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-09 21:54:13 -07:00
|
|
|
flag = TTY_PARITY;
|
2008-12-21 02:54:31 -07:00
|
|
|
port->icount.parity++;
|
|
|
|
}
|
|
|
|
else if (status & MPC52xx_PSC_SR_FE) {
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-09 21:54:13 -07:00
|
|
|
flag = TTY_FRAME;
|
2008-12-21 02:54:31 -07:00
|
|
|
port->icount.frame++;
|
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/* Clear error condition */
|
2008-01-16 14:37:25 -07:00
|
|
|
out_8(&PSC(port)->command, MPC52xx_PSC_RST_ERR_STAT);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
}
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-09 21:54:13 -07:00
|
|
|
tty_insert_flip_char(tty, ch, flag);
|
|
|
|
if (status & MPC52xx_PSC_SR_OE) {
|
|
|
|
/*
|
|
|
|
* Overrun is special, since it's
|
|
|
|
* reported immediately, and doesn't
|
|
|
|
* affect the current character
|
|
|
|
*/
|
|
|
|
tty_insert_flip_char(tty, 0, TTY_OVERRUN);
|
2008-12-21 02:54:31 -07:00
|
|
|
port->icount.overrun++;
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-09 21:54:13 -07:00
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2008-04-29 01:36:25 -06:00
|
|
|
spin_unlock(&port->lock);
|
2005-04-16 16:20:36 -06:00
|
|
|
tty_flip_buffer_push(tty);
|
2008-04-29 01:36:25 -06:00
|
|
|
spin_lock(&port->lock);
|
2006-11-27 14:21:01 -07:00
|
|
|
|
2008-01-28 10:28:55 -07:00
|
|
|
return psc_ops->raw_rx_rdy(port);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
static inline int
|
|
|
|
mpc52xx_uart_int_tx_chars(struct uart_port *port)
|
|
|
|
{
|
2009-09-19 14:13:28 -06:00
|
|
|
struct circ_buf *xmit = &port->state->xmit;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/* Process out of band chars */
|
|
|
|
if (port->x_char) {
|
2008-01-28 10:28:55 -07:00
|
|
|
psc_ops->write_char(port, port->x_char);
|
2005-04-16 16:20:36 -06:00
|
|
|
port->icount.tx++;
|
|
|
|
port->x_char = 0;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Nothing to do ? */
|
|
|
|
if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
|
2005-08-31 03:12:14 -06:00
|
|
|
mpc52xx_uart_stop_tx(port);
|
2005-04-16 16:20:36 -06:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Send chars */
|
2008-01-28 10:28:55 -07:00
|
|
|
while (psc_ops->raw_tx_rdy(port)) {
|
|
|
|
psc_ops->write_char(port, xmit->buf[xmit->tail]);
|
2005-04-16 16:20:36 -06:00
|
|
|
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
|
|
|
|
port->icount.tx++;
|
|
|
|
if (uart_circ_empty(xmit))
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Wake up */
|
|
|
|
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
|
|
|
|
uart_write_wakeup(port);
|
|
|
|
|
|
|
|
/* Maybe we're done after all */
|
|
|
|
if (uart_circ_empty(xmit)) {
|
2005-08-31 03:12:14 -06:00
|
|
|
mpc52xx_uart_stop_tx(port);
|
2005-04-16 16:20:36 -06:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2006-11-27 14:21:01 -07:00
|
|
|
static irqreturn_t
|
2010-02-16 22:30:03 -07:00
|
|
|
mpc5xxx_uart_process_int(struct uart_port *port)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
unsigned long pass = ISR_PASS_LIMIT;
|
|
|
|
unsigned int keepgoing;
|
2008-12-21 02:54:32 -07:00
|
|
|
u8 status;
|
2006-11-27 14:21:01 -07:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/* While we have stuff to do, we continue */
|
|
|
|
do {
|
|
|
|
/* If we don't find anything to do, we stop */
|
2006-11-27 14:21:01 -07:00
|
|
|
keepgoing = 0;
|
|
|
|
|
2008-01-28 10:28:55 -07:00
|
|
|
psc_ops->rx_clr_irq(port);
|
|
|
|
if (psc_ops->rx_rdy(port))
|
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 07:55:46 -06:00
|
|
|
keepgoing |= mpc52xx_uart_int_rx_chars(port);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2008-01-28 10:28:55 -07:00
|
|
|
psc_ops->tx_clr_irq(port);
|
|
|
|
if (psc_ops->tx_rdy(port))
|
2005-04-16 16:20:36 -06:00
|
|
|
keepgoing |= mpc52xx_uart_int_tx_chars(port);
|
2006-11-27 14:21:01 -07:00
|
|
|
|
2008-12-21 02:54:32 -07:00
|
|
|
status = in_8(&PSC(port)->mpc52xx_psc_ipcr);
|
|
|
|
if (status & MPC52xx_PSC_D_DCD)
|
|
|
|
uart_handle_dcd_change(port, !(status & MPC52xx_PSC_DCD));
|
|
|
|
|
|
|
|
if (status & MPC52xx_PSC_D_CTS)
|
|
|
|
uart_handle_cts_change(port, !(status & MPC52xx_PSC_CTS));
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/* Limit number of iteration */
|
2008-01-16 14:37:25 -07:00
|
|
|
if (!(--pass))
|
2005-04-16 16:20:36 -06:00
|
|
|
keepgoing = 0;
|
|
|
|
|
|
|
|
} while (keepgoing);
|
2006-11-27 14:21:01 -07:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
|
2010-02-16 22:30:03 -07:00
|
|
|
static irqreturn_t
|
|
|
|
mpc52xx_uart_int(int irq, void *dev_id)
|
|
|
|
{
|
|
|
|
struct uart_port *port = dev_id;
|
|
|
|
irqreturn_t ret;
|
|
|
|
|
|
|
|
spin_lock(&port->lock);
|
|
|
|
|
|
|
|
ret = psc_ops->handle_irq(port);
|
|
|
|
|
|
|
|
spin_unlock(&port->lock);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/* ======================================================================== */
|
|
|
|
/* Console ( if applicable ) */
|
|
|
|
/* ======================================================================== */
|
|
|
|
|
|
|
|
#ifdef CONFIG_SERIAL_MPC52xx_CONSOLE
|
|
|
|
|
|
|
|
static void __init
|
|
|
|
mpc52xx_console_get_options(struct uart_port *port,
|
2008-01-16 14:37:25 -07:00
|
|
|
int *baud, int *parity, int *bits, int *flow)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
struct mpc52xx_psc __iomem *psc = PSC(port);
|
|
|
|
unsigned char mr1;
|
|
|
|
|
2006-11-27 14:21:02 -07:00
|
|
|
pr_debug("mpc52xx_console_get_options(port=%p)\n", port);
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/* Read the mode registers */
|
2008-01-16 14:37:25 -07:00
|
|
|
out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
|
2005-04-16 16:20:36 -06:00
|
|
|
mr1 = in_8(&psc->mode);
|
2006-11-27 14:21:01 -07:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/* CT{U,L}R are write-only ! */
|
2006-11-27 14:21:02 -07:00
|
|
|
*baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/* Parse them */
|
|
|
|
switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) {
|
2008-01-16 14:37:25 -07:00
|
|
|
case MPC52xx_PSC_MODE_5_BITS:
|
|
|
|
*bits = 5;
|
|
|
|
break;
|
|
|
|
case MPC52xx_PSC_MODE_6_BITS:
|
|
|
|
*bits = 6;
|
|
|
|
break;
|
|
|
|
case MPC52xx_PSC_MODE_7_BITS:
|
|
|
|
*bits = 7;
|
|
|
|
break;
|
|
|
|
case MPC52xx_PSC_MODE_8_BITS:
|
|
|
|
default:
|
|
|
|
*bits = 8;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
2006-11-27 14:21:01 -07:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
if (mr1 & MPC52xx_PSC_MODE_PARNONE)
|
|
|
|
*parity = 'n';
|
|
|
|
else
|
|
|
|
*parity = mr1 & MPC52xx_PSC_MODE_PARODD ? 'o' : 'e';
|
|
|
|
}
|
|
|
|
|
2006-11-27 14:21:01 -07:00
|
|
|
static void
|
2005-04-16 16:20:36 -06:00
|
|
|
mpc52xx_console_write(struct console *co, const char *s, unsigned int count)
|
|
|
|
{
|
|
|
|
struct uart_port *port = &mpc52xx_uart_ports[co->index];
|
|
|
|
unsigned int i, j;
|
2006-11-27 14:21:01 -07:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/* Disable interrupts */
|
2008-01-28 10:28:55 -07:00
|
|
|
psc_ops->cw_disable_ints(port);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/* Wait the TX buffer to be empty */
|
2006-11-27 14:21:01 -07:00
|
|
|
j = 5000000; /* Maximum wait */
|
2008-01-28 10:28:55 -07:00
|
|
|
while (!mpc52xx_uart_tx_empty(port) && --j)
|
2005-04-16 16:20:36 -06:00
|
|
|
udelay(1);
|
|
|
|
|
|
|
|
/* Write all the chars */
|
2006-03-20 13:00:09 -07:00
|
|
|
for (i = 0; i < count; i++, s++) {
|
2005-04-16 16:20:36 -06:00
|
|
|
/* Line return handling */
|
2006-03-20 13:00:09 -07:00
|
|
|
if (*s == '\n')
|
2008-01-28 10:28:55 -07:00
|
|
|
psc_ops->write_char(port, '\r');
|
2006-11-27 14:21:01 -07:00
|
|
|
|
2006-03-20 13:00:09 -07:00
|
|
|
/* Send the char */
|
2008-01-28 10:28:55 -07:00
|
|
|
psc_ops->write_char(port, *s);
|
2006-03-20 13:00:09 -07:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/* Wait the TX buffer to be empty */
|
2006-11-27 14:21:01 -07:00
|
|
|
j = 20000; /* Maximum wait */
|
2008-01-28 10:28:55 -07:00
|
|
|
while (!mpc52xx_uart_tx_empty(port) && --j)
|
2005-04-16 16:20:36 -06:00
|
|
|
udelay(1);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Restore interrupt state */
|
2008-01-28 10:28:55 -07:00
|
|
|
psc_ops->cw_restore_ints(port);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2006-11-27 14:21:02 -07:00
|
|
|
|
|
|
|
static int __init
|
|
|
|
mpc52xx_console_setup(struct console *co, char *options)
|
|
|
|
{
|
|
|
|
struct uart_port *port = &mpc52xx_uart_ports[co->index];
|
|
|
|
struct device_node *np = mpc52xx_uart_nodes[co->index];
|
2008-01-28 10:28:55 -07:00
|
|
|
unsigned int uartclk;
|
2006-11-27 14:21:02 -07:00
|
|
|
struct resource res;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
|
|
|
|
int bits = 8;
|
|
|
|
int parity = 'n';
|
|
|
|
int flow = 'n';
|
|
|
|
|
|
|
|
pr_debug("mpc52xx_console_setup co=%p, co->index=%i, options=%s\n",
|
|
|
|
co, co->index, options);
|
|
|
|
|
2009-05-28 15:34:29 -06:00
|
|
|
if ((co->index < 0) || (co->index >= MPC52xx_PSC_MAXNUM)) {
|
2006-11-27 14:21:02 -07:00
|
|
|
pr_debug("PSC%x out of range\n", co->index);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!np) {
|
|
|
|
pr_debug("PSC%x not found in device tree\n", co->index);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
pr_debug("Console on ttyPSC%x is %s\n",
|
2008-01-16 14:37:25 -07:00
|
|
|
co->index, mpc52xx_uart_nodes[co->index]->full_name);
|
2006-11-27 14:21:02 -07:00
|
|
|
|
|
|
|
/* Fetch register locations */
|
2008-01-16 14:37:25 -07:00
|
|
|
ret = of_address_to_resource(np, 0, &res);
|
|
|
|
if (ret) {
|
2006-11-27 14:21:02 -07:00
|
|
|
pr_debug("Could not get resources for PSC%x\n", co->index);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2010-04-26 05:18:12 -06:00
|
|
|
uartclk = mpc5xxx_get_bus_frequency(np);
|
2008-01-28 10:28:55 -07:00
|
|
|
if (uartclk == 0) {
|
|
|
|
pr_debug("Could not find uart clock frequency!\n");
|
2006-11-27 14:21:02 -07:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Basic port init. Needed since we use some uart_??? func before
|
|
|
|
* real init for early access */
|
|
|
|
spin_lock_init(&port->lock);
|
2008-01-28 10:28:55 -07:00
|
|
|
port->uartclk = uartclk;
|
2006-11-27 14:21:02 -07:00
|
|
|
port->ops = &mpc52xx_uart_ops;
|
|
|
|
port->mapbase = res.start;
|
|
|
|
port->membase = ioremap(res.start, sizeof(struct mpc52xx_psc));
|
|
|
|
port->irq = irq_of_parse_and_map(np, 0);
|
|
|
|
|
|
|
|
if (port->membase == NULL)
|
|
|
|
return -EINVAL;
|
|
|
|
|
2007-10-13 22:37:02 -06:00
|
|
|
pr_debug("mpc52xx-psc uart at %p, mapped to %p, irq=%x, freq=%i\n",
|
2008-01-16 14:37:25 -07:00
|
|
|
(void *)port->mapbase, port->membase,
|
|
|
|
port->irq, port->uartclk);
|
2006-11-27 14:21:02 -07:00
|
|
|
|
|
|
|
/* Setup the port parameters accoding to options */
|
|
|
|
if (options)
|
|
|
|
uart_parse_options(options, &baud, &parity, &bits, &flow);
|
|
|
|
else
|
|
|
|
mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);
|
|
|
|
|
|
|
|
pr_debug("Setting console parameters: %i %i%c1 flow=%c\n",
|
2008-01-16 14:37:25 -07:00
|
|
|
baud, bits, parity, flow);
|
2006-11-27 14:21:02 -07:00
|
|
|
|
|
|
|
return uart_set_options(port, co, baud, parity, bits, flow);
|
|
|
|
}
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2006-01-06 01:11:31 -07:00
|
|
|
static struct uart_driver mpc52xx_uart_driver;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
static struct console mpc52xx_console = {
|
2006-01-06 01:11:32 -07:00
|
|
|
.name = "ttyPSC",
|
2005-04-16 16:20:36 -06:00
|
|
|
.write = mpc52xx_console_write,
|
|
|
|
.device = uart_console_device,
|
|
|
|
.setup = mpc52xx_console_setup,
|
|
|
|
.flags = CON_PRINTBUFFER,
|
2008-01-16 14:37:25 -07:00
|
|
|
.index = -1, /* Specified on the cmdline (e.g. console=ttyPSC0) */
|
2005-04-16 16:20:36 -06:00
|
|
|
.data = &mpc52xx_uart_driver,
|
|
|
|
};
|
|
|
|
|
2006-11-27 14:21:01 -07:00
|
|
|
|
|
|
|
static int __init
|
2005-04-16 16:20:36 -06:00
|
|
|
mpc52xx_console_init(void)
|
|
|
|
{
|
2006-11-27 14:21:02 -07:00
|
|
|
mpc52xx_uart_of_enumerate();
|
2005-04-16 16:20:36 -06:00
|
|
|
register_console(&mpc52xx_console);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
console_initcall(mpc52xx_console_init);
|
|
|
|
|
|
|
|
#define MPC52xx_PSC_CONSOLE &mpc52xx_console
|
|
|
|
#else
|
|
|
|
#define MPC52xx_PSC_CONSOLE NULL
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
|
|
/* ======================================================================== */
|
|
|
|
/* UART Driver */
|
|
|
|
/* ======================================================================== */
|
|
|
|
|
|
|
|
static struct uart_driver mpc52xx_uart_driver = {
|
|
|
|
.driver_name = "mpc52xx_psc_uart",
|
2006-01-06 01:11:32 -07:00
|
|
|
.dev_name = "ttyPSC",
|
|
|
|
.major = SERIAL_PSC_MAJOR,
|
|
|
|
.minor = SERIAL_PSC_MINOR,
|
2005-04-16 16:20:36 -06:00
|
|
|
.nr = MPC52xx_PSC_MAXNUM,
|
|
|
|
.cons = MPC52xx_PSC_CONSOLE,
|
|
|
|
};
|
|
|
|
|
2006-11-27 14:21:02 -07:00
|
|
|
/* ======================================================================== */
|
|
|
|
/* OF Platform Driver */
|
|
|
|
/* ======================================================================== */
|
|
|
|
|
2008-02-06 22:29:25 -07:00
|
|
|
static struct of_device_id mpc52xx_uart_of_match[] = {
|
|
|
|
#ifdef CONFIG_PPC_MPC52xx
|
2010-04-26 05:18:12 -06:00
|
|
|
{ .compatible = "fsl,mpc5200b-psc-uart", .data = &mpc5200b_psc_ops, },
|
2008-02-06 22:29:25 -07:00
|
|
|
{ .compatible = "fsl,mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
|
|
|
|
/* binding used by old lite5200 device trees: */
|
|
|
|
{ .compatible = "mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
|
|
|
|
/* binding used by efika: */
|
|
|
|
{ .compatible = "mpc5200-serial", .data = &mpc52xx_psc_ops, },
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_PPC_MPC512x
|
|
|
|
{ .compatible = "fsl,mpc5121-psc-uart", .data = &mpc512x_psc_ops, },
|
|
|
|
#endif
|
2008-04-29 06:40:37 -06:00
|
|
|
{},
|
2008-02-06 22:29:25 -07:00
|
|
|
};
|
|
|
|
|
2006-11-27 14:21:02 -07:00
|
|
|
static int __devinit
|
|
|
|
mpc52xx_uart_of_probe(struct of_device *op, const struct of_device_id *match)
|
|
|
|
{
|
|
|
|
int idx = -1;
|
2008-01-28 10:28:55 -07:00
|
|
|
unsigned int uartclk;
|
2006-11-27 14:21:02 -07:00
|
|
|
struct uart_port *port = NULL;
|
|
|
|
struct resource res;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
dev_dbg(&op->dev, "mpc52xx_uart_probe(op=%p, match=%p)\n", op, match);
|
|
|
|
|
|
|
|
/* Check validity & presence */
|
|
|
|
for (idx = 0; idx < MPC52xx_PSC_MAXNUM; idx++)
|
2010-04-13 17:12:29 -06:00
|
|
|
if (mpc52xx_uart_nodes[idx] == op->dev.of_node)
|
2006-11-27 14:21:02 -07:00
|
|
|
break;
|
|
|
|
if (idx >= MPC52xx_PSC_MAXNUM)
|
|
|
|
return -EINVAL;
|
|
|
|
pr_debug("Found %s assigned to ttyPSC%x\n",
|
2008-01-16 14:37:25 -07:00
|
|
|
mpc52xx_uart_nodes[idx]->full_name, idx);
|
2006-11-27 14:21:02 -07:00
|
|
|
|
2010-04-26 05:18:12 -06:00
|
|
|
/* set the uart clock to the input clock of the psc, the different
|
|
|
|
* prescalers are taken into account in the set_baudrate() methods
|
|
|
|
* of the respective chip */
|
|
|
|
uartclk = mpc5xxx_get_bus_frequency(op->dev.of_node);
|
2008-01-28 10:28:55 -07:00
|
|
|
if (uartclk == 0) {
|
|
|
|
dev_dbg(&op->dev, "Could not find uart clock frequency!\n");
|
2006-11-27 14:21:02 -07:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Init the port structure */
|
|
|
|
port = &mpc52xx_uart_ports[idx];
|
|
|
|
|
|
|
|
spin_lock_init(&port->lock);
|
2008-01-28 10:28:55 -07:00
|
|
|
port->uartclk = uartclk;
|
2006-11-27 14:21:02 -07:00
|
|
|
port->fifosize = 512;
|
|
|
|
port->iotype = UPIO_MEM;
|
|
|
|
port->flags = UPF_BOOT_AUTOCONF |
|
2008-01-16 14:37:25 -07:00
|
|
|
(uart_console(port) ? 0 : UPF_IOREMAP);
|
2006-11-27 14:21:02 -07:00
|
|
|
port->line = idx;
|
|
|
|
port->ops = &mpc52xx_uart_ops;
|
|
|
|
port->dev = &op->dev;
|
|
|
|
|
|
|
|
/* Search for IRQ and mapbase */
|
2010-04-13 17:12:29 -06:00
|
|
|
ret = of_address_to_resource(op->dev.of_node, 0, &res);
|
2008-01-16 14:37:25 -07:00
|
|
|
if (ret)
|
2006-11-27 14:21:02 -07:00
|
|
|
return ret;
|
|
|
|
|
|
|
|
port->mapbase = res.start;
|
2008-12-21 02:54:32 -07:00
|
|
|
if (!port->mapbase) {
|
|
|
|
dev_dbg(&op->dev, "Could not allocate resources for PSC\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2010-04-13 17:12:29 -06:00
|
|
|
psc_ops->get_irq(port, op->dev.of_node);
|
2008-12-21 02:54:32 -07:00
|
|
|
if (port->irq == NO_IRQ) {
|
|
|
|
dev_dbg(&op->dev, "Could not get irq\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
2006-11-27 14:21:02 -07:00
|
|
|
|
2007-10-13 22:37:02 -06:00
|
|
|
dev_dbg(&op->dev, "mpc52xx-psc uart at %p, irq=%x, freq=%i\n",
|
2008-01-16 14:37:25 -07:00
|
|
|
(void *)port->mapbase, port->irq, port->uartclk);
|
2006-11-27 14:21:02 -07:00
|
|
|
|
|
|
|
/* Add the port to the uart sub-system */
|
|
|
|
ret = uart_add_one_port(&mpc52xx_uart_driver, port);
|
2010-02-16 22:30:03 -07:00
|
|
|
if (ret)
|
2008-12-21 02:54:32 -07:00
|
|
|
return ret;
|
2006-11-27 14:21:02 -07:00
|
|
|
|
2008-12-21 02:54:32 -07:00
|
|
|
dev_set_drvdata(&op->dev, (void *)port);
|
|
|
|
return 0;
|
2006-11-27 14:21:02 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
mpc52xx_uart_of_remove(struct of_device *op)
|
|
|
|
{
|
|
|
|
struct uart_port *port = dev_get_drvdata(&op->dev);
|
|
|
|
dev_set_drvdata(&op->dev, NULL);
|
|
|
|
|
2010-02-16 22:30:03 -07:00
|
|
|
if (port)
|
2006-11-27 14:21:02 -07:00
|
|
|
uart_remove_one_port(&mpc52xx_uart_driver, port);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
static int
|
|
|
|
mpc52xx_uart_of_suspend(struct of_device *op, pm_message_t state)
|
|
|
|
{
|
|
|
|
struct uart_port *port = (struct uart_port *) dev_get_drvdata(&op->dev);
|
|
|
|
|
|
|
|
if (port)
|
|
|
|
uart_suspend_port(&mpc52xx_uart_driver, port);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
mpc52xx_uart_of_resume(struct of_device *op)
|
|
|
|
{
|
|
|
|
struct uart_port *port = (struct uart_port *) dev_get_drvdata(&op->dev);
|
|
|
|
|
|
|
|
if (port)
|
|
|
|
uart_resume_port(&mpc52xx_uart_driver, port);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
static void
|
2009-02-03 12:30:25 -07:00
|
|
|
mpc52xx_uart_of_assign(struct device_node *np)
|
2006-11-27 14:21:02 -07:00
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
2009-02-03 12:30:25 -07:00
|
|
|
/* Find the first free PSC number */
|
2006-11-27 14:21:02 -07:00
|
|
|
for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
|
|
|
|
if (mpc52xx_uart_nodes[i] == NULL) {
|
2009-02-03 12:30:25 -07:00
|
|
|
of_node_get(np);
|
|
|
|
mpc52xx_uart_nodes[i] = np;
|
|
|
|
return;
|
2006-11-27 14:21:02 -07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
mpc52xx_uart_of_enumerate(void)
|
|
|
|
{
|
2008-01-16 14:37:25 -07:00
|
|
|
static int enum_done;
|
2006-11-27 14:21:02 -07:00
|
|
|
struct device_node *np;
|
2008-01-28 10:28:56 -07:00
|
|
|
const struct of_device_id *match;
|
2006-11-27 14:21:02 -07:00
|
|
|
int i;
|
|
|
|
|
|
|
|
if (enum_done)
|
|
|
|
return;
|
|
|
|
|
2009-02-03 12:30:25 -07:00
|
|
|
/* Assign index to each PSC in device tree */
|
|
|
|
for_each_matching_node(np, mpc52xx_uart_of_match) {
|
2008-01-28 10:28:56 -07:00
|
|
|
match = of_match_node(mpc52xx_uart_of_match, np);
|
|
|
|
psc_ops = match->data;
|
2009-02-03 12:30:25 -07:00
|
|
|
mpc52xx_uart_of_assign(np);
|
2006-11-27 14:21:02 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
enum_done = 1;
|
|
|
|
|
|
|
|
for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
|
|
|
|
if (mpc52xx_uart_nodes[i])
|
|
|
|
pr_debug("%s assigned to ttyPSC%x\n",
|
2008-01-16 14:37:25 -07:00
|
|
|
mpc52xx_uart_nodes[i]->full_name, i);
|
2006-11-27 14:21:02 -07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
MODULE_DEVICE_TABLE(of, mpc52xx_uart_of_match);
|
|
|
|
|
|
|
|
static struct of_platform_driver mpc52xx_uart_of_driver = {
|
|
|
|
.probe = mpc52xx_uart_of_probe,
|
|
|
|
.remove = mpc52xx_uart_of_remove,
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
.suspend = mpc52xx_uart_of_suspend,
|
|
|
|
.resume = mpc52xx_uart_of_resume,
|
|
|
|
#endif
|
2010-04-13 17:13:02 -06:00
|
|
|
.driver = {
|
|
|
|
.name = "mpc52xx-psc-uart",
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.of_match_table = mpc52xx_uart_of_match,
|
2006-11-27 14:21:02 -07:00
|
|
|
},
|
|
|
|
};
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
|
|
|
|
/* ======================================================================== */
|
|
|
|
/* Module */
|
|
|
|
/* ======================================================================== */
|
|
|
|
|
|
|
|
static int __init
|
|
|
|
mpc52xx_uart_init(void)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
2006-11-27 14:21:02 -07:00
|
|
|
printk(KERN_INFO "Serial: MPC52xx PSC UART driver\n");
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2008-01-16 14:37:25 -07:00
|
|
|
ret = uart_register_driver(&mpc52xx_uart_driver);
|
|
|
|
if (ret) {
|
2006-11-27 14:21:02 -07:00
|
|
|
printk(KERN_ERR "%s: uart_register_driver failed (%i)\n",
|
|
|
|
__FILE__, ret);
|
|
|
|
return ret;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2006-11-27 14:21:02 -07:00
|
|
|
mpc52xx_uart_of_enumerate();
|
|
|
|
|
2010-02-16 22:30:03 -07:00
|
|
|
/*
|
|
|
|
* Map the PSC FIFO Controller and init if on MPC512x.
|
|
|
|
*/
|
2010-05-04 16:18:59 -06:00
|
|
|
if (psc_ops && psc_ops->fifoc_init) {
|
2010-02-16 22:30:03 -07:00
|
|
|
ret = psc_ops->fifoc_init();
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2006-11-27 14:21:02 -07:00
|
|
|
ret = of_register_platform_driver(&mpc52xx_uart_of_driver);
|
|
|
|
if (ret) {
|
|
|
|
printk(KERN_ERR "%s: of_register_platform_driver failed (%i)\n",
|
|
|
|
__FILE__, ret);
|
|
|
|
uart_unregister_driver(&mpc52xx_uart_driver);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit
|
|
|
|
mpc52xx_uart_exit(void)
|
|
|
|
{
|
2010-02-16 22:30:03 -07:00
|
|
|
if (psc_ops->fifoc_uninit)
|
|
|
|
psc_ops->fifoc_uninit();
|
|
|
|
|
2006-11-27 14:21:02 -07:00
|
|
|
of_unregister_platform_driver(&mpc52xx_uart_of_driver);
|
2005-04-16 16:20:36 -06:00
|
|
|
uart_unregister_driver(&mpc52xx_uart_driver);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
module_init(mpc52xx_uart_init);
|
|
|
|
module_exit(mpc52xx_uart_exit);
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
|
|
|
|
MODULE_DESCRIPTION("Freescale MPC52xx PSC UART");
|
|
|
|
MODULE_LICENSE("GPL");
|