![Anatolij Gustschin](/assets/img/avatar_default.png)
mpc512x platform clock code names PSC clocks as "pscX_mclk" but the driver tries to get "pscX_clk" clock and this results in errors like: mpc52xx-psc-uart 80011700.psc: Failed to get PSC clock entry! The problem appears when opening ttyPSC devices other than the system's serial console. Since getting and enabling the PSC clock fails, uart port startup doesn't succeed and tty flag TTY_IO_ERROR remains set causing further errors in tty ioctls, i.e. 'strace stty -F /dev/ttyPSC1' shows: open("/dev/ttyPSC1", O_RDONLY|O_NONBLOCK|O_LARGEFILE) = 3 dup2(3, 0) = 0 close(3) = 0 fcntl64(0, F_GETFL) = 0x10800 (flags O_RDONLY|O_NONBLOCK|O_LARGEFILE) fcntl64(0, F_SETFL, O_RDONLY|O_LARGEFILE) = 0 ioctl(0, TCGETS, 0xbff89038) = -1 EIO (Input/output error) Only request PSC clock names that the platform actually provides. Signed-off-by: Anatolij Gustschin <agust@denx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1531 lines
39 KiB
C
1531 lines
39 KiB
C
/*
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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>
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*
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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>.
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*
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* Copyright (C) 2008 Freescale Semiconductor Inc.
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* John Rigby <jrigby@gmail.com>
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* Added support for MPC5121
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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>
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* Copyright (C) 2003 MontaVista, Software, Inc.
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*
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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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*/
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#undef DEBUG
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/serial.h>
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#include <linux/sysrq.h>
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#include <linux/console.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/clk.h>
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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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/* 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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#define ISR_PASS_LIMIT 256 /* Max number of iteration in the interrupt */
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static struct uart_port mpc52xx_uart_ports[MPC52xx_PSC_MAXNUM];
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/* Rem: - We use the read_status_mask as a shadow of
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* psc->mpc52xx_psc_imr
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* - It's important that is array is all zero on start as we
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* use it to know if it's initialized or not ! If it's not sure
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* it's cleared, then a memset(...,0,...) should be added to
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* the console_init
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*/
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/* lookup table for matching device nodes to index numbers */
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static struct device_node *mpc52xx_uart_nodes[MPC52xx_PSC_MAXNUM];
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static void mpc52xx_uart_of_enumerate(void);
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#define PSC(port) ((struct mpc52xx_psc __iomem *)((port)->membase))
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/* Forward declaration of the interruption handling routine */
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static irqreturn_t mpc52xx_uart_int(int irq, void *dev_id);
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static irqreturn_t mpc5xxx_uart_process_int(struct uart_port *port);
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/* Simple macro to test if a port is console or not. This one is taken
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* for serial_core.c and maybe should be moved to serial_core.h ? */
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#ifdef CONFIG_SERIAL_CORE_CONSOLE
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#define uart_console(port) \
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((port)->cons && (port)->cons->index == (port)->line)
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#else
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#define uart_console(port) (0)
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#endif
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/* ======================================================================== */
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/* PSC fifo operations for isolating differences between 52xx and 512x */
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/* ======================================================================== */
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struct psc_ops {
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void (*fifo_init)(struct uart_port *port);
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int (*raw_rx_rdy)(struct uart_port *port);
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int (*raw_tx_rdy)(struct uart_port *port);
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int (*rx_rdy)(struct uart_port *port);
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int (*tx_rdy)(struct uart_port *port);
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int (*tx_empty)(struct uart_port *port);
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void (*stop_rx)(struct uart_port *port);
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void (*start_tx)(struct uart_port *port);
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void (*stop_tx)(struct uart_port *port);
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void (*rx_clr_irq)(struct uart_port *port);
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void (*tx_clr_irq)(struct uart_port *port);
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void (*write_char)(struct uart_port *port, unsigned char c);
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unsigned char (*read_char)(struct uart_port *port);
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void (*cw_disable_ints)(struct uart_port *port);
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void (*cw_restore_ints)(struct uart_port *port);
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unsigned int (*set_baudrate)(struct uart_port *port,
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struct ktermios *new,
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struct ktermios *old);
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int (*clock)(struct uart_port *port, int enable);
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int (*fifoc_init)(void);
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void (*fifoc_uninit)(void);
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void (*get_irq)(struct uart_port *, struct device_node *);
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irqreturn_t (*handle_irq)(struct uart_port *port);
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};
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/* setting the prescaler and divisor reg is common for all chips */
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static inline void mpc52xx_set_divisor(struct mpc52xx_psc __iomem *psc,
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u16 prescaler, unsigned int divisor)
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{
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/* select prescaler */
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out_be16(&psc->mpc52xx_psc_clock_select, prescaler);
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out_8(&psc->ctur, divisor >> 8);
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out_8(&psc->ctlr, divisor & 0xff);
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}
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#ifdef CONFIG_PPC_MPC52xx
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#define FIFO_52xx(port) ((struct mpc52xx_psc_fifo __iomem *)(PSC(port)+1))
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static void mpc52xx_psc_fifo_init(struct uart_port *port)
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{
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struct mpc52xx_psc __iomem *psc = PSC(port);
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struct mpc52xx_psc_fifo __iomem *fifo = FIFO_52xx(port);
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out_8(&fifo->rfcntl, 0x00);
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out_be16(&fifo->rfalarm, 0x1ff);
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out_8(&fifo->tfcntl, 0x07);
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out_be16(&fifo->tfalarm, 0x80);
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port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY;
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out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
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}
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static int mpc52xx_psc_raw_rx_rdy(struct uart_port *port)
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{
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return in_be16(&PSC(port)->mpc52xx_psc_status)
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& MPC52xx_PSC_SR_RXRDY;
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}
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static int mpc52xx_psc_raw_tx_rdy(struct uart_port *port)
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{
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return in_be16(&PSC(port)->mpc52xx_psc_status)
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& MPC52xx_PSC_SR_TXRDY;
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}
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static int mpc52xx_psc_rx_rdy(struct uart_port *port)
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{
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return in_be16(&PSC(port)->mpc52xx_psc_isr)
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& port->read_status_mask
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& MPC52xx_PSC_IMR_RXRDY;
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}
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static int mpc52xx_psc_tx_rdy(struct uart_port *port)
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{
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return in_be16(&PSC(port)->mpc52xx_psc_isr)
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& port->read_status_mask
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& MPC52xx_PSC_IMR_TXRDY;
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}
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static int mpc52xx_psc_tx_empty(struct uart_port *port)
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{
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return in_be16(&PSC(port)->mpc52xx_psc_status)
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& MPC52xx_PSC_SR_TXEMP;
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}
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static void mpc52xx_psc_start_tx(struct uart_port *port)
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{
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port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY;
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out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
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}
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static void mpc52xx_psc_stop_tx(struct uart_port *port)
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{
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port->read_status_mask &= ~MPC52xx_PSC_IMR_TXRDY;
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out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
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}
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static void mpc52xx_psc_stop_rx(struct uart_port *port)
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{
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port->read_status_mask &= ~MPC52xx_PSC_IMR_RXRDY;
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out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
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}
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static void mpc52xx_psc_rx_clr_irq(struct uart_port *port)
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{
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}
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static void mpc52xx_psc_tx_clr_irq(struct uart_port *port)
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{
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}
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static void mpc52xx_psc_write_char(struct uart_port *port, unsigned char c)
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{
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out_8(&PSC(port)->mpc52xx_psc_buffer_8, c);
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}
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static unsigned char mpc52xx_psc_read_char(struct uart_port *port)
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{
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return in_8(&PSC(port)->mpc52xx_psc_buffer_8);
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}
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static void mpc52xx_psc_cw_disable_ints(struct uart_port *port)
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{
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out_be16(&PSC(port)->mpc52xx_psc_imr, 0);
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}
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static void mpc52xx_psc_cw_restore_ints(struct uart_port *port)
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{
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out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
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}
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static unsigned int mpc5200_psc_set_baudrate(struct uart_port *port,
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struct ktermios *new,
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struct ktermios *old)
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{
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unsigned int baud;
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unsigned int divisor;
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/* The 5200 has a fixed /32 prescaler, uartclk contains the ipb freq */
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baud = uart_get_baud_rate(port, new, old,
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port->uartclk / (32 * 0xffff) + 1,
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port->uartclk / 32);
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divisor = (port->uartclk + 16 * baud) / (32 * baud);
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/* enable the /32 prescaler and set the divisor */
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mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
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return baud;
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}
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static unsigned int mpc5200b_psc_set_baudrate(struct uart_port *port,
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struct ktermios *new,
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struct ktermios *old)
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{
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unsigned int baud;
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unsigned int divisor;
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u16 prescaler;
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/* The 5200B has a selectable /4 or /32 prescaler, uartclk contains the
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* ipb freq */
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baud = uart_get_baud_rate(port, new, old,
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port->uartclk / (32 * 0xffff) + 1,
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port->uartclk / 4);
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divisor = (port->uartclk + 2 * baud) / (4 * baud);
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/* select the proper prescaler and set the divisor
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* prefer high prescaler for more tolerance on low baudrates */
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if (divisor > 0xffff || baud <= 115200) {
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divisor = (divisor + 4) / 8;
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prescaler = 0xdd00; /* /32 */
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} else
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prescaler = 0xff00; /* /4 */
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mpc52xx_set_divisor(PSC(port), prescaler, divisor);
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return baud;
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}
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static void mpc52xx_psc_get_irq(struct uart_port *port, struct device_node *np)
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{
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port->irqflags = 0;
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port->irq = irq_of_parse_and_map(np, 0);
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}
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/* 52xx specific interrupt handler. The caller holds the port lock */
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static irqreturn_t mpc52xx_psc_handle_irq(struct uart_port *port)
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{
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return mpc5xxx_uart_process_int(port);
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}
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static struct psc_ops mpc52xx_psc_ops = {
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.fifo_init = mpc52xx_psc_fifo_init,
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.raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
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.raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
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.rx_rdy = mpc52xx_psc_rx_rdy,
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.tx_rdy = mpc52xx_psc_tx_rdy,
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.tx_empty = mpc52xx_psc_tx_empty,
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.stop_rx = mpc52xx_psc_stop_rx,
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.start_tx = mpc52xx_psc_start_tx,
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.stop_tx = mpc52xx_psc_stop_tx,
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.rx_clr_irq = mpc52xx_psc_rx_clr_irq,
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.tx_clr_irq = mpc52xx_psc_tx_clr_irq,
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.write_char = mpc52xx_psc_write_char,
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.read_char = mpc52xx_psc_read_char,
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.cw_disable_ints = mpc52xx_psc_cw_disable_ints,
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.cw_restore_ints = mpc52xx_psc_cw_restore_ints,
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.set_baudrate = mpc5200_psc_set_baudrate,
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.get_irq = mpc52xx_psc_get_irq,
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.handle_irq = mpc52xx_psc_handle_irq,
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};
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static struct psc_ops mpc5200b_psc_ops = {
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.fifo_init = mpc52xx_psc_fifo_init,
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.raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
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.raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
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.rx_rdy = mpc52xx_psc_rx_rdy,
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.tx_rdy = mpc52xx_psc_tx_rdy,
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.tx_empty = mpc52xx_psc_tx_empty,
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.stop_rx = mpc52xx_psc_stop_rx,
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.start_tx = mpc52xx_psc_start_tx,
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.stop_tx = mpc52xx_psc_stop_tx,
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.rx_clr_irq = mpc52xx_psc_rx_clr_irq,
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.tx_clr_irq = mpc52xx_psc_tx_clr_irq,
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.write_char = mpc52xx_psc_write_char,
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.read_char = mpc52xx_psc_read_char,
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.cw_disable_ints = mpc52xx_psc_cw_disable_ints,
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.cw_restore_ints = mpc52xx_psc_cw_restore_ints,
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.set_baudrate = mpc5200b_psc_set_baudrate,
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.get_irq = mpc52xx_psc_get_irq,
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.handle_irq = mpc52xx_psc_handle_irq,
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};
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#endif /* CONFIG_MPC52xx */
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#ifdef CONFIG_PPC_MPC512x
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#define FIFO_512x(port) ((struct mpc512x_psc_fifo __iomem *)(PSC(port)+1))
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/* PSC FIFO Controller for mpc512x */
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struct psc_fifoc {
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u32 fifoc_cmd;
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u32 fifoc_int;
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u32 fifoc_dma;
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u32 fifoc_axe;
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u32 fifoc_debug;
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};
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static struct psc_fifoc __iomem *psc_fifoc;
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static unsigned int psc_fifoc_irq;
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static void mpc512x_psc_fifo_init(struct uart_port *port)
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{
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/* /32 prescaler */
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out_be16(&PSC(port)->mpc52xx_psc_clock_select, 0xdd00);
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out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE);
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out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
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out_be32(&FIFO_512x(port)->txalarm, 1);
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out_be32(&FIFO_512x(port)->tximr, 0);
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out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE);
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out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
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out_be32(&FIFO_512x(port)->rxalarm, 1);
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out_be32(&FIFO_512x(port)->rximr, 0);
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out_be32(&FIFO_512x(port)->tximr, MPC512x_PSC_FIFO_ALARM);
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out_be32(&FIFO_512x(port)->rximr, MPC512x_PSC_FIFO_ALARM);
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}
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static int mpc512x_psc_raw_rx_rdy(struct uart_port *port)
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{
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return !(in_be32(&FIFO_512x(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY);
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}
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static int mpc512x_psc_raw_tx_rdy(struct uart_port *port)
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{
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return !(in_be32(&FIFO_512x(port)->txsr) & MPC512x_PSC_FIFO_FULL);
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}
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static int mpc512x_psc_rx_rdy(struct uart_port *port)
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{
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return in_be32(&FIFO_512x(port)->rxsr)
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& in_be32(&FIFO_512x(port)->rximr)
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& MPC512x_PSC_FIFO_ALARM;
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}
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static int mpc512x_psc_tx_rdy(struct uart_port *port)
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{
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return in_be32(&FIFO_512x(port)->txsr)
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& in_be32(&FIFO_512x(port)->tximr)
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& MPC512x_PSC_FIFO_ALARM;
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}
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static int mpc512x_psc_tx_empty(struct uart_port *port)
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{
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return in_be32(&FIFO_512x(port)->txsr)
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& MPC512x_PSC_FIFO_EMPTY;
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}
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static void mpc512x_psc_stop_rx(struct uart_port *port)
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{
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unsigned long rx_fifo_imr;
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rx_fifo_imr = in_be32(&FIFO_512x(port)->rximr);
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rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
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out_be32(&FIFO_512x(port)->rximr, rx_fifo_imr);
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}
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static void mpc512x_psc_start_tx(struct uart_port *port)
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{
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unsigned long tx_fifo_imr;
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|
|
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);
|
|
}
|
|
|
|
static unsigned int mpc512x_psc_set_baudrate(struct uart_port *port,
|
|
struct ktermios *new,
|
|
struct ktermios *old)
|
|
{
|
|
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;
|
|
}
|
|
|
|
/* 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__);
|
|
of_node_put(np);
|
|
return -ENODEV;
|
|
}
|
|
|
|
psc_fifoc_irq = irq_of_parse_and_map(np, 0);
|
|
of_node_put(np);
|
|
if (psc_fifoc_irq == 0) {
|
|
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_mclk", 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;
|
|
}
|
|
|
|
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,
|
|
.set_baudrate = mpc512x_psc_set_baudrate,
|
|
.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,
|
|
};
|
|
#endif
|
|
|
|
static const struct psc_ops *psc_ops;
|
|
|
|
/* ======================================================================== */
|
|
/* UART operations */
|
|
/* ======================================================================== */
|
|
|
|
static unsigned int
|
|
mpc52xx_uart_tx_empty(struct uart_port *port)
|
|
{
|
|
return psc_ops->tx_empty(port) ? TIOCSER_TEMT : 0;
|
|
}
|
|
|
|
static void
|
|
mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
|
|
{
|
|
if (mctrl & TIOCM_RTS)
|
|
out_8(&PSC(port)->op1, MPC52xx_PSC_OP_RTS);
|
|
else
|
|
out_8(&PSC(port)->op0, MPC52xx_PSC_OP_RTS);
|
|
}
|
|
|
|
static unsigned int
|
|
mpc52xx_uart_get_mctrl(struct uart_port *port)
|
|
{
|
|
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;
|
|
}
|
|
|
|
static void
|
|
mpc52xx_uart_stop_tx(struct uart_port *port)
|
|
{
|
|
/* port->lock taken by caller */
|
|
psc_ops->stop_tx(port);
|
|
}
|
|
|
|
static void
|
|
mpc52xx_uart_start_tx(struct uart_port *port)
|
|
{
|
|
/* port->lock taken by caller */
|
|
psc_ops->start_tx(port);
|
|
}
|
|
|
|
static void
|
|
mpc52xx_uart_send_xchar(struct uart_port *port, char ch)
|
|
{
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
|
|
port->x_char = ch;
|
|
if (ch) {
|
|
/* Make sure tx interrupts are on */
|
|
/* Truly necessary ??? They should be anyway */
|
|
psc_ops->start_tx(port);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
}
|
|
|
|
static void
|
|
mpc52xx_uart_stop_rx(struct uart_port *port)
|
|
{
|
|
/* port->lock taken by caller */
|
|
psc_ops->stop_rx(port);
|
|
}
|
|
|
|
static void
|
|
mpc52xx_uart_enable_ms(struct uart_port *port)
|
|
{
|
|
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);
|
|
}
|
|
|
|
static void
|
|
mpc52xx_uart_break_ctl(struct uart_port *port, int ctl)
|
|
{
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
|
|
if (ctl == -1)
|
|
out_8(&PSC(port)->command, MPC52xx_PSC_START_BRK);
|
|
else
|
|
out_8(&PSC(port)->command, MPC52xx_PSC_STOP_BRK);
|
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
}
|
|
|
|
static int
|
|
mpc52xx_uart_startup(struct uart_port *port)
|
|
{
|
|
struct mpc52xx_psc __iomem *psc = PSC(port);
|
|
int ret;
|
|
|
|
if (psc_ops->clock) {
|
|
ret = psc_ops->clock(port, 1);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
/* Request IRQ */
|
|
ret = request_irq(port->irq, mpc52xx_uart_int,
|
|
port->irqflags, "mpc52xx_psc_uart", port);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Reset/activate the port, clear and enable interrupts */
|
|
out_8(&psc->command, MPC52xx_PSC_RST_RX);
|
|
out_8(&psc->command, MPC52xx_PSC_RST_TX);
|
|
|
|
out_be32(&psc->sicr, 0); /* UART mode DCD ignored */
|
|
|
|
psc_ops->fifo_init(port);
|
|
|
|
out_8(&psc->command, MPC52xx_PSC_TX_ENABLE);
|
|
out_8(&psc->command, MPC52xx_PSC_RX_ENABLE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
mpc52xx_uart_shutdown(struct uart_port *port)
|
|
{
|
|
struct mpc52xx_psc __iomem *psc = PSC(port);
|
|
|
|
/* Shut down the port. Leave TX active if on a console port */
|
|
out_8(&psc->command, MPC52xx_PSC_RST_RX);
|
|
if (!uart_console(port))
|
|
out_8(&psc->command, MPC52xx_PSC_RST_TX);
|
|
|
|
port->read_status_mask = 0;
|
|
out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
|
|
|
|
if (psc_ops->clock)
|
|
psc_ops->clock(port, 0);
|
|
|
|
/* Release interrupt */
|
|
free_irq(port->irq, port);
|
|
}
|
|
|
|
static void
|
|
mpc52xx_uart_set_termios(struct uart_port *port, struct ktermios *new,
|
|
struct ktermios *old)
|
|
{
|
|
struct mpc52xx_psc __iomem *psc = PSC(port);
|
|
unsigned long flags;
|
|
unsigned char mr1, mr2;
|
|
unsigned int j;
|
|
unsigned int baud;
|
|
|
|
/* Prepare what we're gonna write */
|
|
mr1 = 0;
|
|
|
|
switch (new->c_cflag & CSIZE) {
|
|
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;
|
|
}
|
|
|
|
if (new->c_cflag & PARENB) {
|
|
if (new->c_cflag & CMSPAR)
|
|
mr1 |= MPC52xx_PSC_MODE_PARFORCE;
|
|
|
|
/* With CMSPAR, PARODD also means high parity (same as termios) */
|
|
mr1 |= (new->c_cflag & PARODD) ?
|
|
MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN;
|
|
} else {
|
|
mr1 |= MPC52xx_PSC_MODE_PARNONE;
|
|
}
|
|
|
|
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;
|
|
|
|
if (new->c_cflag & CRTSCTS) {
|
|
mr1 |= MPC52xx_PSC_MODE_RXRTS;
|
|
mr2 |= MPC52xx_PSC_MODE_TXCTS;
|
|
}
|
|
|
|
/* Get the lock */
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
|
|
/* Do our best to flush TX & RX, so we don't lose anything */
|
|
/* But we don't wait indefinitely ! */
|
|
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)); */
|
|
while (!mpc52xx_uart_tx_empty(port) && --j)
|
|
udelay(1);
|
|
|
|
if (!j)
|
|
printk(KERN_ERR "mpc52xx_uart.c: "
|
|
"Unable to flush RX & TX fifos in-time in set_termios."
|
|
"Some chars may have been lost.\n");
|
|
|
|
/* Reset the TX & RX */
|
|
out_8(&psc->command, MPC52xx_PSC_RST_RX);
|
|
out_8(&psc->command, MPC52xx_PSC_RST_TX);
|
|
|
|
/* Send new mode settings */
|
|
out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
|
|
out_8(&psc->mode, mr1);
|
|
out_8(&psc->mode, mr2);
|
|
baud = psc_ops->set_baudrate(port, new, old);
|
|
|
|
/* Update the per-port timeout */
|
|
uart_update_timeout(port, new->c_cflag, baud);
|
|
|
|
if (UART_ENABLE_MS(port, new->c_cflag))
|
|
mpc52xx_uart_enable_ms(port);
|
|
|
|
/* Reenable TX & RX */
|
|
out_8(&psc->command, MPC52xx_PSC_TX_ENABLE);
|
|
out_8(&psc->command, MPC52xx_PSC_RX_ENABLE);
|
|
|
|
/* We're all set, release the lock */
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
}
|
|
|
|
static const char *
|
|
mpc52xx_uart_type(struct uart_port *port)
|
|
{
|
|
/*
|
|
* We keep using PORT_MPC52xx for historic reasons although it applies
|
|
* for MPC512x, too, but print "MPC5xxx" to not irritate users
|
|
*/
|
|
return port->type == PORT_MPC52xx ? "MPC5xxx PSC" : NULL;
|
|
}
|
|
|
|
static void
|
|
mpc52xx_uart_release_port(struct uart_port *port)
|
|
{
|
|
/* remapped by us ? */
|
|
if (port->flags & UPF_IOREMAP) {
|
|
iounmap(port->membase);
|
|
port->membase = NULL;
|
|
}
|
|
|
|
release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
|
|
}
|
|
|
|
static int
|
|
mpc52xx_uart_request_port(struct uart_port *port)
|
|
{
|
|
int err;
|
|
|
|
if (port->flags & UPF_IOREMAP) /* Need to remap ? */
|
|
port->membase = ioremap(port->mapbase,
|
|
sizeof(struct mpc52xx_psc));
|
|
|
|
if (!port->membase)
|
|
return -EINVAL;
|
|
|
|
err = request_mem_region(port->mapbase, sizeof(struct mpc52xx_psc),
|
|
"mpc52xx_psc_uart") != NULL ? 0 : -EBUSY;
|
|
|
|
if (err && (port->flags & UPF_IOREMAP)) {
|
|
iounmap(port->membase);
|
|
port->membase = NULL;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static void
|
|
mpc52xx_uart_config_port(struct uart_port *port, int flags)
|
|
{
|
|
if ((flags & UART_CONFIG_TYPE)
|
|
&& (mpc52xx_uart_request_port(port) == 0))
|
|
port->type = PORT_MPC52xx;
|
|
}
|
|
|
|
static int
|
|
mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
|
|
{
|
|
if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPC52xx)
|
|
return -EINVAL;
|
|
|
|
if ((ser->irq != port->irq) ||
|
|
(ser->io_type != UPIO_MEM) ||
|
|
(ser->baud_base != port->uartclk) ||
|
|
(ser->iomem_base != (void *)port->mapbase) ||
|
|
(ser->hub6 != 0))
|
|
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
|
|
};
|
|
|
|
|
|
/* ======================================================================== */
|
|
/* Interrupt handling */
|
|
/* ======================================================================== */
|
|
|
|
static inline int
|
|
mpc52xx_uart_int_rx_chars(struct uart_port *port)
|
|
{
|
|
struct tty_port *tport = &port->state->port;
|
|
unsigned char ch, flag;
|
|
unsigned short status;
|
|
|
|
/* While we can read, do so ! */
|
|
while (psc_ops->raw_rx_rdy(port)) {
|
|
/* Get the char */
|
|
ch = psc_ops->read_char(port);
|
|
|
|
/* Handle sysreq char */
|
|
#ifdef SUPPORT_SYSRQ
|
|
if (uart_handle_sysrq_char(port, ch)) {
|
|
port->sysrq = 0;
|
|
continue;
|
|
}
|
|
#endif
|
|
|
|
/* Store it */
|
|
|
|
flag = TTY_NORMAL;
|
|
port->icount.rx++;
|
|
|
|
status = in_be16(&PSC(port)->mpc52xx_psc_status);
|
|
|
|
if (status & (MPC52xx_PSC_SR_PE |
|
|
MPC52xx_PSC_SR_FE |
|
|
MPC52xx_PSC_SR_RB)) {
|
|
|
|
if (status & MPC52xx_PSC_SR_RB) {
|
|
flag = TTY_BREAK;
|
|
uart_handle_break(port);
|
|
port->icount.brk++;
|
|
} else if (status & MPC52xx_PSC_SR_PE) {
|
|
flag = TTY_PARITY;
|
|
port->icount.parity++;
|
|
}
|
|
else if (status & MPC52xx_PSC_SR_FE) {
|
|
flag = TTY_FRAME;
|
|
port->icount.frame++;
|
|
}
|
|
|
|
/* Clear error condition */
|
|
out_8(&PSC(port)->command, MPC52xx_PSC_RST_ERR_STAT);
|
|
|
|
}
|
|
tty_insert_flip_char(tport, 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(tport, 0, TTY_OVERRUN);
|
|
port->icount.overrun++;
|
|
}
|
|
}
|
|
|
|
spin_unlock(&port->lock);
|
|
tty_flip_buffer_push(tport);
|
|
spin_lock(&port->lock);
|
|
|
|
return psc_ops->raw_rx_rdy(port);
|
|
}
|
|
|
|
static inline int
|
|
mpc52xx_uart_int_tx_chars(struct uart_port *port)
|
|
{
|
|
struct circ_buf *xmit = &port->state->xmit;
|
|
|
|
/* Process out of band chars */
|
|
if (port->x_char) {
|
|
psc_ops->write_char(port, port->x_char);
|
|
port->icount.tx++;
|
|
port->x_char = 0;
|
|
return 1;
|
|
}
|
|
|
|
/* Nothing to do ? */
|
|
if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
|
|
mpc52xx_uart_stop_tx(port);
|
|
return 0;
|
|
}
|
|
|
|
/* Send chars */
|
|
while (psc_ops->raw_tx_rdy(port)) {
|
|
psc_ops->write_char(port, xmit->buf[xmit->tail]);
|
|
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)) {
|
|
mpc52xx_uart_stop_tx(port);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static irqreturn_t
|
|
mpc5xxx_uart_process_int(struct uart_port *port)
|
|
{
|
|
unsigned long pass = ISR_PASS_LIMIT;
|
|
unsigned int keepgoing;
|
|
u8 status;
|
|
|
|
/* While we have stuff to do, we continue */
|
|
do {
|
|
/* If we don't find anything to do, we stop */
|
|
keepgoing = 0;
|
|
|
|
psc_ops->rx_clr_irq(port);
|
|
if (psc_ops->rx_rdy(port))
|
|
keepgoing |= mpc52xx_uart_int_rx_chars(port);
|
|
|
|
psc_ops->tx_clr_irq(port);
|
|
if (psc_ops->tx_rdy(port))
|
|
keepgoing |= mpc52xx_uart_int_tx_chars(port);
|
|
|
|
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));
|
|
|
|
/* Limit number of iteration */
|
|
if (!(--pass))
|
|
keepgoing = 0;
|
|
|
|
} while (keepgoing);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/* ======================================================================== */
|
|
/* Console ( if applicable ) */
|
|
/* ======================================================================== */
|
|
|
|
#ifdef CONFIG_SERIAL_MPC52xx_CONSOLE
|
|
|
|
static void __init
|
|
mpc52xx_console_get_options(struct uart_port *port,
|
|
int *baud, int *parity, int *bits, int *flow)
|
|
{
|
|
struct mpc52xx_psc __iomem *psc = PSC(port);
|
|
unsigned char mr1;
|
|
|
|
pr_debug("mpc52xx_console_get_options(port=%p)\n", port);
|
|
|
|
/* Read the mode registers */
|
|
out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
|
|
mr1 = in_8(&psc->mode);
|
|
|
|
/* CT{U,L}R are write-only ! */
|
|
*baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
|
|
|
|
/* Parse them */
|
|
switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) {
|
|
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;
|
|
}
|
|
|
|
if (mr1 & MPC52xx_PSC_MODE_PARNONE)
|
|
*parity = 'n';
|
|
else
|
|
*parity = mr1 & MPC52xx_PSC_MODE_PARODD ? 'o' : 'e';
|
|
}
|
|
|
|
static void
|
|
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;
|
|
|
|
/* Disable interrupts */
|
|
psc_ops->cw_disable_ints(port);
|
|
|
|
/* Wait the TX buffer to be empty */
|
|
j = 5000000; /* Maximum wait */
|
|
while (!mpc52xx_uart_tx_empty(port) && --j)
|
|
udelay(1);
|
|
|
|
/* Write all the chars */
|
|
for (i = 0; i < count; i++, s++) {
|
|
/* Line return handling */
|
|
if (*s == '\n')
|
|
psc_ops->write_char(port, '\r');
|
|
|
|
/* Send the char */
|
|
psc_ops->write_char(port, *s);
|
|
|
|
/* Wait the TX buffer to be empty */
|
|
j = 20000; /* Maximum wait */
|
|
while (!mpc52xx_uart_tx_empty(port) && --j)
|
|
udelay(1);
|
|
}
|
|
|
|
/* Restore interrupt state */
|
|
psc_ops->cw_restore_ints(port);
|
|
}
|
|
|
|
|
|
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];
|
|
unsigned int uartclk;
|
|
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);
|
|
|
|
if ((co->index < 0) || (co->index >= MPC52xx_PSC_MAXNUM)) {
|
|
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",
|
|
co->index, mpc52xx_uart_nodes[co->index]->full_name);
|
|
|
|
/* Fetch register locations */
|
|
ret = of_address_to_resource(np, 0, &res);
|
|
if (ret) {
|
|
pr_debug("Could not get resources for PSC%x\n", co->index);
|
|
return ret;
|
|
}
|
|
|
|
uartclk = mpc5xxx_get_bus_frequency(np);
|
|
if (uartclk == 0) {
|
|
pr_debug("Could not find uart clock frequency!\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Basic port init. Needed since we use some uart_??? func before
|
|
* real init for early access */
|
|
spin_lock_init(&port->lock);
|
|
port->uartclk = uartclk;
|
|
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;
|
|
|
|
pr_debug("mpc52xx-psc uart at %p, mapped to %p, irq=%x, freq=%i\n",
|
|
(void *)port->mapbase, port->membase,
|
|
port->irq, port->uartclk);
|
|
|
|
/* 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",
|
|
baud, bits, parity, flow);
|
|
|
|
return uart_set_options(port, co, baud, parity, bits, flow);
|
|
}
|
|
|
|
|
|
static struct uart_driver mpc52xx_uart_driver;
|
|
|
|
static struct console mpc52xx_console = {
|
|
.name = "ttyPSC",
|
|
.write = mpc52xx_console_write,
|
|
.device = uart_console_device,
|
|
.setup = mpc52xx_console_setup,
|
|
.flags = CON_PRINTBUFFER,
|
|
.index = -1, /* Specified on the cmdline (e.g. console=ttyPSC0) */
|
|
.data = &mpc52xx_uart_driver,
|
|
};
|
|
|
|
|
|
static int __init
|
|
mpc52xx_console_init(void)
|
|
{
|
|
mpc52xx_uart_of_enumerate();
|
|
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",
|
|
.dev_name = "ttyPSC",
|
|
.major = SERIAL_PSC_MAJOR,
|
|
.minor = SERIAL_PSC_MINOR,
|
|
.nr = MPC52xx_PSC_MAXNUM,
|
|
.cons = MPC52xx_PSC_CONSOLE,
|
|
};
|
|
|
|
/* ======================================================================== */
|
|
/* OF Platform Driver */
|
|
/* ======================================================================== */
|
|
|
|
static struct of_device_id mpc52xx_uart_of_match[] = {
|
|
#ifdef CONFIG_PPC_MPC52xx
|
|
{ .compatible = "fsl,mpc5200b-psc-uart", .data = &mpc5200b_psc_ops, },
|
|
{ .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
|
|
{},
|
|
};
|
|
|
|
static int mpc52xx_uart_of_probe(struct platform_device *op)
|
|
{
|
|
int idx = -1;
|
|
unsigned int uartclk;
|
|
struct uart_port *port = NULL;
|
|
struct resource res;
|
|
int ret;
|
|
|
|
/* Check validity & presence */
|
|
for (idx = 0; idx < MPC52xx_PSC_MAXNUM; idx++)
|
|
if (mpc52xx_uart_nodes[idx] == op->dev.of_node)
|
|
break;
|
|
if (idx >= MPC52xx_PSC_MAXNUM)
|
|
return -EINVAL;
|
|
pr_debug("Found %s assigned to ttyPSC%x\n",
|
|
mpc52xx_uart_nodes[idx]->full_name, idx);
|
|
|
|
/* 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);
|
|
if (uartclk == 0) {
|
|
dev_dbg(&op->dev, "Could not find uart clock frequency!\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Init the port structure */
|
|
port = &mpc52xx_uart_ports[idx];
|
|
|
|
spin_lock_init(&port->lock);
|
|
port->uartclk = uartclk;
|
|
port->fifosize = 512;
|
|
port->iotype = UPIO_MEM;
|
|
port->flags = UPF_BOOT_AUTOCONF |
|
|
(uart_console(port) ? 0 : UPF_IOREMAP);
|
|
port->line = idx;
|
|
port->ops = &mpc52xx_uart_ops;
|
|
port->dev = &op->dev;
|
|
|
|
/* Search for IRQ and mapbase */
|
|
ret = of_address_to_resource(op->dev.of_node, 0, &res);
|
|
if (ret)
|
|
return ret;
|
|
|
|
port->mapbase = res.start;
|
|
if (!port->mapbase) {
|
|
dev_dbg(&op->dev, "Could not allocate resources for PSC\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
psc_ops->get_irq(port, op->dev.of_node);
|
|
if (port->irq == 0) {
|
|
dev_dbg(&op->dev, "Could not get irq\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
dev_dbg(&op->dev, "mpc52xx-psc uart at %p, irq=%x, freq=%i\n",
|
|
(void *)port->mapbase, port->irq, port->uartclk);
|
|
|
|
/* Add the port to the uart sub-system */
|
|
ret = uart_add_one_port(&mpc52xx_uart_driver, port);
|
|
if (ret)
|
|
return ret;
|
|
|
|
dev_set_drvdata(&op->dev, (void *)port);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
mpc52xx_uart_of_remove(struct platform_device *op)
|
|
{
|
|
struct uart_port *port = dev_get_drvdata(&op->dev);
|
|
dev_set_drvdata(&op->dev, NULL);
|
|
|
|
if (port)
|
|
uart_remove_one_port(&mpc52xx_uart_driver, port);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int
|
|
mpc52xx_uart_of_suspend(struct platform_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 platform_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
|
|
mpc52xx_uart_of_assign(struct device_node *np)
|
|
{
|
|
int i;
|
|
|
|
/* Find the first free PSC number */
|
|
for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
|
|
if (mpc52xx_uart_nodes[i] == NULL) {
|
|
of_node_get(np);
|
|
mpc52xx_uart_nodes[i] = np;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
mpc52xx_uart_of_enumerate(void)
|
|
{
|
|
static int enum_done;
|
|
struct device_node *np;
|
|
const struct of_device_id *match;
|
|
int i;
|
|
|
|
if (enum_done)
|
|
return;
|
|
|
|
/* Assign index to each PSC in device tree */
|
|
for_each_matching_node(np, mpc52xx_uart_of_match) {
|
|
match = of_match_node(mpc52xx_uart_of_match, np);
|
|
psc_ops = match->data;
|
|
mpc52xx_uart_of_assign(np);
|
|
}
|
|
|
|
enum_done = 1;
|
|
|
|
for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
|
|
if (mpc52xx_uart_nodes[i])
|
|
pr_debug("%s assigned to ttyPSC%x\n",
|
|
mpc52xx_uart_nodes[i]->full_name, i);
|
|
}
|
|
}
|
|
|
|
MODULE_DEVICE_TABLE(of, mpc52xx_uart_of_match);
|
|
|
|
static struct 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
|
|
.driver = {
|
|
.name = "mpc52xx-psc-uart",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = mpc52xx_uart_of_match,
|
|
},
|
|
};
|
|
|
|
|
|
/* ======================================================================== */
|
|
/* Module */
|
|
/* ======================================================================== */
|
|
|
|
static int __init
|
|
mpc52xx_uart_init(void)
|
|
{
|
|
int ret;
|
|
|
|
printk(KERN_INFO "Serial: MPC52xx PSC UART driver\n");
|
|
|
|
ret = uart_register_driver(&mpc52xx_uart_driver);
|
|
if (ret) {
|
|
printk(KERN_ERR "%s: uart_register_driver failed (%i)\n",
|
|
__FILE__, ret);
|
|
return ret;
|
|
}
|
|
|
|
mpc52xx_uart_of_enumerate();
|
|
|
|
/*
|
|
* Map the PSC FIFO Controller and init if on MPC512x.
|
|
*/
|
|
if (psc_ops && psc_ops->fifoc_init) {
|
|
ret = psc_ops->fifoc_init();
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
ret = platform_driver_register(&mpc52xx_uart_of_driver);
|
|
if (ret) {
|
|
printk(KERN_ERR "%s: platform_driver_register failed (%i)\n",
|
|
__FILE__, ret);
|
|
uart_unregister_driver(&mpc52xx_uart_driver);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit
|
|
mpc52xx_uart_exit(void)
|
|
{
|
|
if (psc_ops->fifoc_uninit)
|
|
psc_ops->fifoc_uninit();
|
|
|
|
platform_driver_unregister(&mpc52xx_uart_of_driver);
|
|
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");
|