![Andrzej Hajda](/assets/img/avatar_default.png)
The function can return negative values. The problem has been detected using proposed semantic patch scripts/coccinelle/tests/unsigned_lesser_than_zero.cocci [1]. [1]: http://permalink.gmane.org/gmane.linux.kernel/2038576 Signed-off-by: Andrzej Hajda <a.hajda@samsung.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
804 lines
20 KiB
C
804 lines
20 KiB
C
/*
|
|
* High Speed Serial Ports on NXP LPC32xx SoC
|
|
*
|
|
* Authors: Kevin Wells <kevin.wells@nxp.com>
|
|
* Roland Stigge <stigge@antcom.de>
|
|
*
|
|
* Copyright (C) 2010 NXP Semiconductors
|
|
* Copyright (C) 2012 Roland Stigge
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/init.h>
|
|
#include <linux/console.h>
|
|
#include <linux/sysrq.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/tty_flip.h>
|
|
#include <linux/serial_core.h>
|
|
#include <linux/serial.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/nmi.h>
|
|
#include <linux/io.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/of.h>
|
|
#include <mach/platform.h>
|
|
#include <mach/hardware.h>
|
|
|
|
/*
|
|
* High Speed UART register offsets
|
|
*/
|
|
#define LPC32XX_HSUART_FIFO(x) ((x) + 0x00)
|
|
#define LPC32XX_HSUART_LEVEL(x) ((x) + 0x04)
|
|
#define LPC32XX_HSUART_IIR(x) ((x) + 0x08)
|
|
#define LPC32XX_HSUART_CTRL(x) ((x) + 0x0C)
|
|
#define LPC32XX_HSUART_RATE(x) ((x) + 0x10)
|
|
|
|
#define LPC32XX_HSU_BREAK_DATA (1 << 10)
|
|
#define LPC32XX_HSU_ERROR_DATA (1 << 9)
|
|
#define LPC32XX_HSU_RX_EMPTY (1 << 8)
|
|
|
|
#define LPC32XX_HSU_TX_LEV(n) (((n) >> 8) & 0xFF)
|
|
#define LPC32XX_HSU_RX_LEV(n) ((n) & 0xFF)
|
|
|
|
#define LPC32XX_HSU_TX_INT_SET (1 << 6)
|
|
#define LPC32XX_HSU_RX_OE_INT (1 << 5)
|
|
#define LPC32XX_HSU_BRK_INT (1 << 4)
|
|
#define LPC32XX_HSU_FE_INT (1 << 3)
|
|
#define LPC32XX_HSU_RX_TIMEOUT_INT (1 << 2)
|
|
#define LPC32XX_HSU_RX_TRIG_INT (1 << 1)
|
|
#define LPC32XX_HSU_TX_INT (1 << 0)
|
|
|
|
#define LPC32XX_HSU_HRTS_INV (1 << 21)
|
|
#define LPC32XX_HSU_HRTS_TRIG_8B (0x0 << 19)
|
|
#define LPC32XX_HSU_HRTS_TRIG_16B (0x1 << 19)
|
|
#define LPC32XX_HSU_HRTS_TRIG_32B (0x2 << 19)
|
|
#define LPC32XX_HSU_HRTS_TRIG_48B (0x3 << 19)
|
|
#define LPC32XX_HSU_HRTS_EN (1 << 18)
|
|
#define LPC32XX_HSU_TMO_DISABLED (0x0 << 16)
|
|
#define LPC32XX_HSU_TMO_INACT_4B (0x1 << 16)
|
|
#define LPC32XX_HSU_TMO_INACT_8B (0x2 << 16)
|
|
#define LPC32XX_HSU_TMO_INACT_16B (0x3 << 16)
|
|
#define LPC32XX_HSU_HCTS_INV (1 << 15)
|
|
#define LPC32XX_HSU_HCTS_EN (1 << 14)
|
|
#define LPC32XX_HSU_OFFSET(n) ((n) << 9)
|
|
#define LPC32XX_HSU_BREAK (1 << 8)
|
|
#define LPC32XX_HSU_ERR_INT_EN (1 << 7)
|
|
#define LPC32XX_HSU_RX_INT_EN (1 << 6)
|
|
#define LPC32XX_HSU_TX_INT_EN (1 << 5)
|
|
#define LPC32XX_HSU_RX_TL1B (0x0 << 2)
|
|
#define LPC32XX_HSU_RX_TL4B (0x1 << 2)
|
|
#define LPC32XX_HSU_RX_TL8B (0x2 << 2)
|
|
#define LPC32XX_HSU_RX_TL16B (0x3 << 2)
|
|
#define LPC32XX_HSU_RX_TL32B (0x4 << 2)
|
|
#define LPC32XX_HSU_RX_TL48B (0x5 << 2)
|
|
#define LPC32XX_HSU_TX_TLEMPTY (0x0 << 0)
|
|
#define LPC32XX_HSU_TX_TL0B (0x0 << 0)
|
|
#define LPC32XX_HSU_TX_TL4B (0x1 << 0)
|
|
#define LPC32XX_HSU_TX_TL8B (0x2 << 0)
|
|
#define LPC32XX_HSU_TX_TL16B (0x3 << 0)
|
|
|
|
#define MODNAME "lpc32xx_hsuart"
|
|
|
|
struct lpc32xx_hsuart_port {
|
|
struct uart_port port;
|
|
};
|
|
|
|
#define FIFO_READ_LIMIT 128
|
|
#define MAX_PORTS 3
|
|
#define LPC32XX_TTY_NAME "ttyTX"
|
|
static struct lpc32xx_hsuart_port lpc32xx_hs_ports[MAX_PORTS];
|
|
|
|
#ifdef CONFIG_SERIAL_HS_LPC32XX_CONSOLE
|
|
static void wait_for_xmit_empty(struct uart_port *port)
|
|
{
|
|
unsigned int timeout = 10000;
|
|
|
|
do {
|
|
if (LPC32XX_HSU_TX_LEV(readl(LPC32XX_HSUART_LEVEL(
|
|
port->membase))) == 0)
|
|
break;
|
|
if (--timeout == 0)
|
|
break;
|
|
udelay(1);
|
|
} while (1);
|
|
}
|
|
|
|
static void wait_for_xmit_ready(struct uart_port *port)
|
|
{
|
|
unsigned int timeout = 10000;
|
|
|
|
while (1) {
|
|
if (LPC32XX_HSU_TX_LEV(readl(LPC32XX_HSUART_LEVEL(
|
|
port->membase))) < 32)
|
|
break;
|
|
if (--timeout == 0)
|
|
break;
|
|
udelay(1);
|
|
}
|
|
}
|
|
|
|
static void lpc32xx_hsuart_console_putchar(struct uart_port *port, int ch)
|
|
{
|
|
wait_for_xmit_ready(port);
|
|
writel((u32)ch, LPC32XX_HSUART_FIFO(port->membase));
|
|
}
|
|
|
|
static void lpc32xx_hsuart_console_write(struct console *co, const char *s,
|
|
unsigned int count)
|
|
{
|
|
struct lpc32xx_hsuart_port *up = &lpc32xx_hs_ports[co->index];
|
|
unsigned long flags;
|
|
int locked = 1;
|
|
|
|
touch_nmi_watchdog();
|
|
local_irq_save(flags);
|
|
if (up->port.sysrq)
|
|
locked = 0;
|
|
else if (oops_in_progress)
|
|
locked = spin_trylock(&up->port.lock);
|
|
else
|
|
spin_lock(&up->port.lock);
|
|
|
|
uart_console_write(&up->port, s, count, lpc32xx_hsuart_console_putchar);
|
|
wait_for_xmit_empty(&up->port);
|
|
|
|
if (locked)
|
|
spin_unlock(&up->port.lock);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static int __init lpc32xx_hsuart_console_setup(struct console *co,
|
|
char *options)
|
|
{
|
|
struct uart_port *port;
|
|
int baud = 115200;
|
|
int bits = 8;
|
|
int parity = 'n';
|
|
int flow = 'n';
|
|
|
|
if (co->index >= MAX_PORTS)
|
|
co->index = 0;
|
|
|
|
port = &lpc32xx_hs_ports[co->index].port;
|
|
if (!port->membase)
|
|
return -ENODEV;
|
|
|
|
if (options)
|
|
uart_parse_options(options, &baud, &parity, &bits, &flow);
|
|
|
|
return uart_set_options(port, co, baud, parity, bits, flow);
|
|
}
|
|
|
|
static struct uart_driver lpc32xx_hsuart_reg;
|
|
static struct console lpc32xx_hsuart_console = {
|
|
.name = LPC32XX_TTY_NAME,
|
|
.write = lpc32xx_hsuart_console_write,
|
|
.device = uart_console_device,
|
|
.setup = lpc32xx_hsuart_console_setup,
|
|
.flags = CON_PRINTBUFFER,
|
|
.index = -1,
|
|
.data = &lpc32xx_hsuart_reg,
|
|
};
|
|
|
|
static int __init lpc32xx_hsuart_console_init(void)
|
|
{
|
|
register_console(&lpc32xx_hsuart_console);
|
|
return 0;
|
|
}
|
|
console_initcall(lpc32xx_hsuart_console_init);
|
|
|
|
#define LPC32XX_HSUART_CONSOLE (&lpc32xx_hsuart_console)
|
|
#else
|
|
#define LPC32XX_HSUART_CONSOLE NULL
|
|
#endif
|
|
|
|
static struct uart_driver lpc32xx_hs_reg = {
|
|
.owner = THIS_MODULE,
|
|
.driver_name = MODNAME,
|
|
.dev_name = LPC32XX_TTY_NAME,
|
|
.nr = MAX_PORTS,
|
|
.cons = LPC32XX_HSUART_CONSOLE,
|
|
};
|
|
static int uarts_registered;
|
|
|
|
static unsigned int __serial_get_clock_div(unsigned long uartclk,
|
|
unsigned long rate)
|
|
{
|
|
u32 div, goodrate, hsu_rate, l_hsu_rate, comprate;
|
|
u32 rate_diff;
|
|
|
|
/* Find the closest divider to get the desired clock rate */
|
|
div = uartclk / rate;
|
|
goodrate = hsu_rate = (div / 14) - 1;
|
|
if (hsu_rate != 0)
|
|
hsu_rate--;
|
|
|
|
/* Tweak divider */
|
|
l_hsu_rate = hsu_rate + 3;
|
|
rate_diff = 0xFFFFFFFF;
|
|
|
|
while (hsu_rate < l_hsu_rate) {
|
|
comprate = uartclk / ((hsu_rate + 1) * 14);
|
|
if (abs(comprate - rate) < rate_diff) {
|
|
goodrate = hsu_rate;
|
|
rate_diff = abs(comprate - rate);
|
|
}
|
|
|
|
hsu_rate++;
|
|
}
|
|
if (hsu_rate > 0xFF)
|
|
hsu_rate = 0xFF;
|
|
|
|
return goodrate;
|
|
}
|
|
|
|
static void __serial_uart_flush(struct uart_port *port)
|
|
{
|
|
u32 tmp;
|
|
int cnt = 0;
|
|
|
|
while ((readl(LPC32XX_HSUART_LEVEL(port->membase)) > 0) &&
|
|
(cnt++ < FIFO_READ_LIMIT))
|
|
tmp = readl(LPC32XX_HSUART_FIFO(port->membase));
|
|
}
|
|
|
|
static void __serial_lpc32xx_rx(struct uart_port *port)
|
|
{
|
|
struct tty_port *tport = &port->state->port;
|
|
unsigned int tmp, flag;
|
|
|
|
/* Read data from FIFO and push into terminal */
|
|
tmp = readl(LPC32XX_HSUART_FIFO(port->membase));
|
|
while (!(tmp & LPC32XX_HSU_RX_EMPTY)) {
|
|
flag = TTY_NORMAL;
|
|
port->icount.rx++;
|
|
|
|
if (tmp & LPC32XX_HSU_ERROR_DATA) {
|
|
/* Framing error */
|
|
writel(LPC32XX_HSU_FE_INT,
|
|
LPC32XX_HSUART_IIR(port->membase));
|
|
port->icount.frame++;
|
|
flag = TTY_FRAME;
|
|
tty_insert_flip_char(tport, 0, TTY_FRAME);
|
|
}
|
|
|
|
tty_insert_flip_char(tport, (tmp & 0xFF), flag);
|
|
|
|
tmp = readl(LPC32XX_HSUART_FIFO(port->membase));
|
|
}
|
|
|
|
spin_unlock(&port->lock);
|
|
tty_flip_buffer_push(tport);
|
|
spin_lock(&port->lock);
|
|
}
|
|
|
|
static void __serial_lpc32xx_tx(struct uart_port *port)
|
|
{
|
|
struct circ_buf *xmit = &port->state->xmit;
|
|
unsigned int tmp;
|
|
|
|
if (port->x_char) {
|
|
writel((u32)port->x_char, LPC32XX_HSUART_FIFO(port->membase));
|
|
port->icount.tx++;
|
|
port->x_char = 0;
|
|
return;
|
|
}
|
|
|
|
if (uart_circ_empty(xmit) || uart_tx_stopped(port))
|
|
goto exit_tx;
|
|
|
|
/* Transfer data */
|
|
while (LPC32XX_HSU_TX_LEV(readl(
|
|
LPC32XX_HSUART_LEVEL(port->membase))) < 64) {
|
|
writel((u32) xmit->buf[xmit->tail],
|
|
LPC32XX_HSUART_FIFO(port->membase));
|
|
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
|
|
port->icount.tx++;
|
|
if (uart_circ_empty(xmit))
|
|
break;
|
|
}
|
|
|
|
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
|
|
uart_write_wakeup(port);
|
|
|
|
exit_tx:
|
|
if (uart_circ_empty(xmit)) {
|
|
tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
|
|
tmp &= ~LPC32XX_HSU_TX_INT_EN;
|
|
writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
|
|
}
|
|
}
|
|
|
|
static irqreturn_t serial_lpc32xx_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct uart_port *port = dev_id;
|
|
struct tty_port *tport = &port->state->port;
|
|
u32 status;
|
|
|
|
spin_lock(&port->lock);
|
|
|
|
/* Read UART status and clear latched interrupts */
|
|
status = readl(LPC32XX_HSUART_IIR(port->membase));
|
|
|
|
if (status & LPC32XX_HSU_BRK_INT) {
|
|
/* Break received */
|
|
writel(LPC32XX_HSU_BRK_INT, LPC32XX_HSUART_IIR(port->membase));
|
|
port->icount.brk++;
|
|
uart_handle_break(port);
|
|
}
|
|
|
|
/* Framing error */
|
|
if (status & LPC32XX_HSU_FE_INT)
|
|
writel(LPC32XX_HSU_FE_INT, LPC32XX_HSUART_IIR(port->membase));
|
|
|
|
if (status & LPC32XX_HSU_RX_OE_INT) {
|
|
/* Receive FIFO overrun */
|
|
writel(LPC32XX_HSU_RX_OE_INT,
|
|
LPC32XX_HSUART_IIR(port->membase));
|
|
port->icount.overrun++;
|
|
tty_insert_flip_char(tport, 0, TTY_OVERRUN);
|
|
tty_schedule_flip(tport);
|
|
}
|
|
|
|
/* Data received? */
|
|
if (status & (LPC32XX_HSU_RX_TIMEOUT_INT | LPC32XX_HSU_RX_TRIG_INT))
|
|
__serial_lpc32xx_rx(port);
|
|
|
|
/* Transmit data request? */
|
|
if ((status & LPC32XX_HSU_TX_INT) && (!uart_tx_stopped(port))) {
|
|
writel(LPC32XX_HSU_TX_INT, LPC32XX_HSUART_IIR(port->membase));
|
|
__serial_lpc32xx_tx(port);
|
|
}
|
|
|
|
spin_unlock(&port->lock);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/* port->lock is not held. */
|
|
static unsigned int serial_lpc32xx_tx_empty(struct uart_port *port)
|
|
{
|
|
unsigned int ret = 0;
|
|
|
|
if (LPC32XX_HSU_TX_LEV(readl(LPC32XX_HSUART_LEVEL(port->membase))) == 0)
|
|
ret = TIOCSER_TEMT;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* port->lock held by caller. */
|
|
static void serial_lpc32xx_set_mctrl(struct uart_port *port,
|
|
unsigned int mctrl)
|
|
{
|
|
/* No signals are supported on HS UARTs */
|
|
}
|
|
|
|
/* port->lock is held by caller and interrupts are disabled. */
|
|
static unsigned int serial_lpc32xx_get_mctrl(struct uart_port *port)
|
|
{
|
|
/* No signals are supported on HS UARTs */
|
|
return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
|
|
}
|
|
|
|
/* port->lock held by caller. */
|
|
static void serial_lpc32xx_stop_tx(struct uart_port *port)
|
|
{
|
|
u32 tmp;
|
|
|
|
tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
|
|
tmp &= ~LPC32XX_HSU_TX_INT_EN;
|
|
writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
|
|
}
|
|
|
|
/* port->lock held by caller. */
|
|
static void serial_lpc32xx_start_tx(struct uart_port *port)
|
|
{
|
|
u32 tmp;
|
|
|
|
__serial_lpc32xx_tx(port);
|
|
tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
|
|
tmp |= LPC32XX_HSU_TX_INT_EN;
|
|
writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
|
|
}
|
|
|
|
/* port->lock held by caller. */
|
|
static void serial_lpc32xx_stop_rx(struct uart_port *port)
|
|
{
|
|
u32 tmp;
|
|
|
|
tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
|
|
tmp &= ~(LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN);
|
|
writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
|
|
|
|
writel((LPC32XX_HSU_BRK_INT | LPC32XX_HSU_RX_OE_INT |
|
|
LPC32XX_HSU_FE_INT), LPC32XX_HSUART_IIR(port->membase));
|
|
}
|
|
|
|
/* port->lock is not held. */
|
|
static void serial_lpc32xx_break_ctl(struct uart_port *port,
|
|
int break_state)
|
|
{
|
|
unsigned long flags;
|
|
u32 tmp;
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
|
|
if (break_state != 0)
|
|
tmp |= LPC32XX_HSU_BREAK;
|
|
else
|
|
tmp &= ~LPC32XX_HSU_BREAK;
|
|
writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
}
|
|
|
|
/* LPC3250 Errata HSUART.1: Hang workaround via loopback mode on inactivity */
|
|
static void lpc32xx_loopback_set(resource_size_t mapbase, int state)
|
|
{
|
|
int bit;
|
|
u32 tmp;
|
|
|
|
switch (mapbase) {
|
|
case LPC32XX_HS_UART1_BASE:
|
|
bit = 0;
|
|
break;
|
|
case LPC32XX_HS_UART2_BASE:
|
|
bit = 1;
|
|
break;
|
|
case LPC32XX_HS_UART7_BASE:
|
|
bit = 6;
|
|
break;
|
|
default:
|
|
WARN(1, "lpc32xx_hs: Warning: Unknown port at %08x\n", mapbase);
|
|
return;
|
|
}
|
|
|
|
tmp = readl(LPC32XX_UARTCTL_CLOOP);
|
|
if (state)
|
|
tmp |= (1 << bit);
|
|
else
|
|
tmp &= ~(1 << bit);
|
|
writel(tmp, LPC32XX_UARTCTL_CLOOP);
|
|
}
|
|
|
|
/* port->lock is not held. */
|
|
static int serial_lpc32xx_startup(struct uart_port *port)
|
|
{
|
|
int retval;
|
|
unsigned long flags;
|
|
u32 tmp;
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
|
|
__serial_uart_flush(port);
|
|
|
|
writel((LPC32XX_HSU_TX_INT | LPC32XX_HSU_FE_INT |
|
|
LPC32XX_HSU_BRK_INT | LPC32XX_HSU_RX_OE_INT),
|
|
LPC32XX_HSUART_IIR(port->membase));
|
|
|
|
writel(0xFF, LPC32XX_HSUART_RATE(port->membase));
|
|
|
|
/*
|
|
* Set receiver timeout, HSU offset of 20, no break, no interrupts,
|
|
* and default FIFO trigger levels
|
|
*/
|
|
tmp = LPC32XX_HSU_TX_TL8B | LPC32XX_HSU_RX_TL32B |
|
|
LPC32XX_HSU_OFFSET(20) | LPC32XX_HSU_TMO_INACT_4B;
|
|
writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
|
|
|
|
lpc32xx_loopback_set(port->mapbase, 0); /* get out of loopback mode */
|
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
retval = request_irq(port->irq, serial_lpc32xx_interrupt,
|
|
0, MODNAME, port);
|
|
if (!retval)
|
|
writel((tmp | LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN),
|
|
LPC32XX_HSUART_CTRL(port->membase));
|
|
|
|
return retval;
|
|
}
|
|
|
|
/* port->lock is not held. */
|
|
static void serial_lpc32xx_shutdown(struct uart_port *port)
|
|
{
|
|
u32 tmp;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
|
|
tmp = LPC32XX_HSU_TX_TL8B | LPC32XX_HSU_RX_TL32B |
|
|
LPC32XX_HSU_OFFSET(20) | LPC32XX_HSU_TMO_INACT_4B;
|
|
writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
|
|
|
|
lpc32xx_loopback_set(port->mapbase, 1); /* go to loopback mode */
|
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
free_irq(port->irq, port);
|
|
}
|
|
|
|
/* port->lock is not held. */
|
|
static void serial_lpc32xx_set_termios(struct uart_port *port,
|
|
struct ktermios *termios,
|
|
struct ktermios *old)
|
|
{
|
|
unsigned long flags;
|
|
unsigned int baud, quot;
|
|
u32 tmp;
|
|
|
|
/* Always 8-bit, no parity, 1 stop bit */
|
|
termios->c_cflag &= ~(CSIZE | CSTOPB | PARENB | PARODD);
|
|
termios->c_cflag |= CS8;
|
|
|
|
termios->c_cflag &= ~(HUPCL | CMSPAR | CLOCAL | CRTSCTS);
|
|
|
|
baud = uart_get_baud_rate(port, termios, old, 0,
|
|
port->uartclk / 14);
|
|
|
|
quot = __serial_get_clock_div(port->uartclk, baud);
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
|
|
/* Ignore characters? */
|
|
tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
|
|
if ((termios->c_cflag & CREAD) == 0)
|
|
tmp &= ~(LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN);
|
|
else
|
|
tmp |= LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN;
|
|
writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
|
|
|
|
writel(quot, LPC32XX_HSUART_RATE(port->membase));
|
|
|
|
uart_update_timeout(port, termios->c_cflag, baud);
|
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
/* Don't rewrite B0 */
|
|
if (tty_termios_baud_rate(termios))
|
|
tty_termios_encode_baud_rate(termios, baud, baud);
|
|
}
|
|
|
|
static const char *serial_lpc32xx_type(struct uart_port *port)
|
|
{
|
|
return MODNAME;
|
|
}
|
|
|
|
static void serial_lpc32xx_release_port(struct uart_port *port)
|
|
{
|
|
if ((port->iotype == UPIO_MEM32) && (port->mapbase)) {
|
|
if (port->flags & UPF_IOREMAP) {
|
|
iounmap(port->membase);
|
|
port->membase = NULL;
|
|
}
|
|
|
|
release_mem_region(port->mapbase, SZ_4K);
|
|
}
|
|
}
|
|
|
|
static int serial_lpc32xx_request_port(struct uart_port *port)
|
|
{
|
|
int ret = -ENODEV;
|
|
|
|
if ((port->iotype == UPIO_MEM32) && (port->mapbase)) {
|
|
ret = 0;
|
|
|
|
if (!request_mem_region(port->mapbase, SZ_4K, MODNAME))
|
|
ret = -EBUSY;
|
|
else if (port->flags & UPF_IOREMAP) {
|
|
port->membase = ioremap(port->mapbase, SZ_4K);
|
|
if (!port->membase) {
|
|
release_mem_region(port->mapbase, SZ_4K);
|
|
ret = -ENOMEM;
|
|
}
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void serial_lpc32xx_config_port(struct uart_port *port, int uflags)
|
|
{
|
|
int ret;
|
|
|
|
ret = serial_lpc32xx_request_port(port);
|
|
if (ret < 0)
|
|
return;
|
|
port->type = PORT_UART00;
|
|
port->fifosize = 64;
|
|
|
|
__serial_uart_flush(port);
|
|
|
|
writel((LPC32XX_HSU_TX_INT | LPC32XX_HSU_FE_INT |
|
|
LPC32XX_HSU_BRK_INT | LPC32XX_HSU_RX_OE_INT),
|
|
LPC32XX_HSUART_IIR(port->membase));
|
|
|
|
writel(0xFF, LPC32XX_HSUART_RATE(port->membase));
|
|
|
|
/* Set receiver timeout, HSU offset of 20, no break, no interrupts,
|
|
and default FIFO trigger levels */
|
|
writel(LPC32XX_HSU_TX_TL8B | LPC32XX_HSU_RX_TL32B |
|
|
LPC32XX_HSU_OFFSET(20) | LPC32XX_HSU_TMO_INACT_4B,
|
|
LPC32XX_HSUART_CTRL(port->membase));
|
|
}
|
|
|
|
static int serial_lpc32xx_verify_port(struct uart_port *port,
|
|
struct serial_struct *ser)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (ser->type != PORT_UART00)
|
|
ret = -EINVAL;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct uart_ops serial_lpc32xx_pops = {
|
|
.tx_empty = serial_lpc32xx_tx_empty,
|
|
.set_mctrl = serial_lpc32xx_set_mctrl,
|
|
.get_mctrl = serial_lpc32xx_get_mctrl,
|
|
.stop_tx = serial_lpc32xx_stop_tx,
|
|
.start_tx = serial_lpc32xx_start_tx,
|
|
.stop_rx = serial_lpc32xx_stop_rx,
|
|
.break_ctl = serial_lpc32xx_break_ctl,
|
|
.startup = serial_lpc32xx_startup,
|
|
.shutdown = serial_lpc32xx_shutdown,
|
|
.set_termios = serial_lpc32xx_set_termios,
|
|
.type = serial_lpc32xx_type,
|
|
.release_port = serial_lpc32xx_release_port,
|
|
.request_port = serial_lpc32xx_request_port,
|
|
.config_port = serial_lpc32xx_config_port,
|
|
.verify_port = serial_lpc32xx_verify_port,
|
|
};
|
|
|
|
/*
|
|
* Register a set of serial devices attached to a platform device
|
|
*/
|
|
static int serial_hs_lpc32xx_probe(struct platform_device *pdev)
|
|
{
|
|
struct lpc32xx_hsuart_port *p = &lpc32xx_hs_ports[uarts_registered];
|
|
int ret = 0;
|
|
struct resource *res;
|
|
|
|
if (uarts_registered >= MAX_PORTS) {
|
|
dev_err(&pdev->dev,
|
|
"Error: Number of possible ports exceeded (%d)!\n",
|
|
uarts_registered + 1);
|
|
return -ENXIO;
|
|
}
|
|
|
|
memset(p, 0, sizeof(*p));
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res) {
|
|
dev_err(&pdev->dev,
|
|
"Error getting mem resource for HS UART port %d\n",
|
|
uarts_registered);
|
|
return -ENXIO;
|
|
}
|
|
p->port.mapbase = res->start;
|
|
p->port.membase = NULL;
|
|
|
|
ret = platform_get_irq(pdev, 0);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Error getting irq for HS UART port %d\n",
|
|
uarts_registered);
|
|
return ret;
|
|
}
|
|
p->port.irq = ret;
|
|
|
|
p->port.iotype = UPIO_MEM32;
|
|
p->port.uartclk = LPC32XX_MAIN_OSC_FREQ;
|
|
p->port.regshift = 2;
|
|
p->port.flags = UPF_BOOT_AUTOCONF | UPF_FIXED_PORT | UPF_IOREMAP;
|
|
p->port.dev = &pdev->dev;
|
|
p->port.ops = &serial_lpc32xx_pops;
|
|
p->port.line = uarts_registered++;
|
|
spin_lock_init(&p->port.lock);
|
|
|
|
/* send port to loopback mode by default */
|
|
lpc32xx_loopback_set(p->port.mapbase, 1);
|
|
|
|
ret = uart_add_one_port(&lpc32xx_hs_reg, &p->port);
|
|
|
|
platform_set_drvdata(pdev, p);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Remove serial ports registered against a platform device.
|
|
*/
|
|
static int serial_hs_lpc32xx_remove(struct platform_device *pdev)
|
|
{
|
|
struct lpc32xx_hsuart_port *p = platform_get_drvdata(pdev);
|
|
|
|
uart_remove_one_port(&lpc32xx_hs_reg, &p->port);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_PM
|
|
static int serial_hs_lpc32xx_suspend(struct platform_device *pdev,
|
|
pm_message_t state)
|
|
{
|
|
struct lpc32xx_hsuart_port *p = platform_get_drvdata(pdev);
|
|
|
|
uart_suspend_port(&lpc32xx_hs_reg, &p->port);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int serial_hs_lpc32xx_resume(struct platform_device *pdev)
|
|
{
|
|
struct lpc32xx_hsuart_port *p = platform_get_drvdata(pdev);
|
|
|
|
uart_resume_port(&lpc32xx_hs_reg, &p->port);
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
#define serial_hs_lpc32xx_suspend NULL
|
|
#define serial_hs_lpc32xx_resume NULL
|
|
#endif
|
|
|
|
static const struct of_device_id serial_hs_lpc32xx_dt_ids[] = {
|
|
{ .compatible = "nxp,lpc3220-hsuart" },
|
|
{ /* sentinel */ }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, serial_hs_lpc32xx_dt_ids);
|
|
|
|
static struct platform_driver serial_hs_lpc32xx_driver = {
|
|
.probe = serial_hs_lpc32xx_probe,
|
|
.remove = serial_hs_lpc32xx_remove,
|
|
.suspend = serial_hs_lpc32xx_suspend,
|
|
.resume = serial_hs_lpc32xx_resume,
|
|
.driver = {
|
|
.name = MODNAME,
|
|
.of_match_table = serial_hs_lpc32xx_dt_ids,
|
|
},
|
|
};
|
|
|
|
static int __init lpc32xx_hsuart_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = uart_register_driver(&lpc32xx_hs_reg);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = platform_driver_register(&serial_hs_lpc32xx_driver);
|
|
if (ret)
|
|
uart_unregister_driver(&lpc32xx_hs_reg);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit lpc32xx_hsuart_exit(void)
|
|
{
|
|
platform_driver_unregister(&serial_hs_lpc32xx_driver);
|
|
uart_unregister_driver(&lpc32xx_hs_reg);
|
|
}
|
|
|
|
module_init(lpc32xx_hsuart_init);
|
|
module_exit(lpc32xx_hsuart_exit);
|
|
|
|
MODULE_AUTHOR("Kevin Wells <kevin.wells@nxp.com>");
|
|
MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
|
|
MODULE_DESCRIPTION("NXP LPC32XX High Speed UART driver");
|
|
MODULE_LICENSE("GPL");
|