594 lines
13 KiB
C
594 lines
13 KiB
C
/*
|
|
* linux/drivers/char/clps711x.c
|
|
*
|
|
* Driver for CLPS711x serial ports
|
|
*
|
|
* Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
|
|
*
|
|
* Copyright 1999 ARM Limited
|
|
* Copyright (C) 2000 Deep Blue Solutions Ltd.
|
|
*
|
|
* 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
* $Id: clps711x.c,v 1.42 2002/07/28 10:03:28 rmk Exp $
|
|
*
|
|
*/
|
|
#include <linux/config.h>
|
|
|
|
#if defined(CONFIG_SERIAL_CLPS711X_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
|
|
#define SUPPORT_SYSRQ
|
|
#endif
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/init.h>
|
|
#include <linux/console.h>
|
|
#include <linux/sysrq.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/device.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/tty_flip.h>
|
|
#include <linux/serial_core.h>
|
|
#include <linux/serial.h>
|
|
|
|
#include <asm/hardware.h>
|
|
#include <asm/io.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/hardware/clps7111.h>
|
|
|
|
#define UART_NR 2
|
|
|
|
#define SERIAL_CLPS711X_MAJOR 204
|
|
#define SERIAL_CLPS711X_MINOR 40
|
|
#define SERIAL_CLPS711X_NR UART_NR
|
|
|
|
/*
|
|
* We use the relevant SYSCON register as a base address for these ports.
|
|
*/
|
|
#define UBRLCR(port) ((port)->iobase + UBRLCR1 - SYSCON1)
|
|
#define UARTDR(port) ((port)->iobase + UARTDR1 - SYSCON1)
|
|
#define SYSFLG(port) ((port)->iobase + SYSFLG1 - SYSCON1)
|
|
#define SYSCON(port) ((port)->iobase + SYSCON1 - SYSCON1)
|
|
|
|
#define TX_IRQ(port) ((port)->irq)
|
|
#define RX_IRQ(port) ((port)->irq + 1)
|
|
|
|
#define UART_ANY_ERR (UARTDR_FRMERR | UARTDR_PARERR | UARTDR_OVERR)
|
|
|
|
#define tx_enabled(port) ((port)->unused[0])
|
|
|
|
static void clps711xuart_stop_tx(struct uart_port *port)
|
|
{
|
|
if (tx_enabled(port)) {
|
|
disable_irq(TX_IRQ(port));
|
|
tx_enabled(port) = 0;
|
|
}
|
|
}
|
|
|
|
static void clps711xuart_start_tx(struct uart_port *port)
|
|
{
|
|
if (!tx_enabled(port)) {
|
|
enable_irq(TX_IRQ(port));
|
|
tx_enabled(port) = 1;
|
|
}
|
|
}
|
|
|
|
static void clps711xuart_stop_rx(struct uart_port *port)
|
|
{
|
|
disable_irq(RX_IRQ(port));
|
|
}
|
|
|
|
static void clps711xuart_enable_ms(struct uart_port *port)
|
|
{
|
|
}
|
|
|
|
static irqreturn_t clps711xuart_int_rx(int irq, void *dev_id, struct pt_regs *regs)
|
|
{
|
|
struct uart_port *port = dev_id;
|
|
struct tty_struct *tty = port->info->tty;
|
|
unsigned int status, ch, flg, ignored = 0;
|
|
|
|
status = clps_readl(SYSFLG(port));
|
|
while (!(status & SYSFLG_URXFE)) {
|
|
ch = clps_readl(UARTDR(port));
|
|
|
|
if (tty->flip.count >= TTY_FLIPBUF_SIZE)
|
|
goto ignore_char;
|
|
port->icount.rx++;
|
|
|
|
flg = TTY_NORMAL;
|
|
|
|
/*
|
|
* Note that the error handling code is
|
|
* out of the main execution path
|
|
*/
|
|
if (unlikely(ch & UART_ANY_ERR)) {
|
|
if (ch & UARTDR_PARERR)
|
|
port->icount.parity++;
|
|
else if (ch & UARTDR_FRMERR)
|
|
port->icount.frame++;
|
|
if (ch & UARTDR_OVERR)
|
|
port->icount.overrun++;
|
|
|
|
ch &= port->read_status_mask;
|
|
|
|
if (ch & UARTDR_PARERR)
|
|
flg = TTY_PARITY;
|
|
else if (ch & UARTDR_FRMERR)
|
|
flg = TTY_FRAME;
|
|
|
|
#ifdef SUPPORT_SYSRQ
|
|
port->sysrq = 0;
|
|
#endif
|
|
}
|
|
|
|
if (uart_handle_sysrq_char(port, ch, regs))
|
|
goto ignore_char;
|
|
|
|
/*
|
|
* CHECK: does overrun affect the current character?
|
|
* ASSUMPTION: it does not.
|
|
*/
|
|
uart_insert_char(port, ch, UARTDR_OVERR, ch, flg);
|
|
|
|
ignore_char:
|
|
status = clps_readl(SYSFLG(port));
|
|
}
|
|
tty_flip_buffer_push(tty);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t clps711xuart_int_tx(int irq, void *dev_id, struct pt_regs *regs)
|
|
{
|
|
struct uart_port *port = dev_id;
|
|
struct circ_buf *xmit = &port->info->xmit;
|
|
int count;
|
|
|
|
if (port->x_char) {
|
|
clps_writel(port->x_char, UARTDR(port));
|
|
port->icount.tx++;
|
|
port->x_char = 0;
|
|
return IRQ_HANDLED;
|
|
}
|
|
if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
|
|
clps711xuart_stop_tx(port);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
count = port->fifosize >> 1;
|
|
do {
|
|
clps_writel(xmit->buf[xmit->tail], UARTDR(port));
|
|
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
|
|
port->icount.tx++;
|
|
if (uart_circ_empty(xmit))
|
|
break;
|
|
} while (--count > 0);
|
|
|
|
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
|
|
uart_write_wakeup(port);
|
|
|
|
if (uart_circ_empty(xmit))
|
|
clps711xuart_stop_tx(port);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static unsigned int clps711xuart_tx_empty(struct uart_port *port)
|
|
{
|
|
unsigned int status = clps_readl(SYSFLG(port));
|
|
return status & SYSFLG_UBUSY ? 0 : TIOCSER_TEMT;
|
|
}
|
|
|
|
static unsigned int clps711xuart_get_mctrl(struct uart_port *port)
|
|
{
|
|
unsigned int port_addr;
|
|
unsigned int result = 0;
|
|
unsigned int status;
|
|
|
|
port_addr = SYSFLG(port);
|
|
if (port_addr == SYSFLG1) {
|
|
status = clps_readl(SYSFLG1);
|
|
if (status & SYSFLG1_DCD)
|
|
result |= TIOCM_CAR;
|
|
if (status & SYSFLG1_DSR)
|
|
result |= TIOCM_DSR;
|
|
if (status & SYSFLG1_CTS)
|
|
result |= TIOCM_CTS;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
static void
|
|
clps711xuart_set_mctrl_null(struct uart_port *port, unsigned int mctrl)
|
|
{
|
|
}
|
|
|
|
static void clps711xuart_break_ctl(struct uart_port *port, int break_state)
|
|
{
|
|
unsigned long flags;
|
|
unsigned int ubrlcr;
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
ubrlcr = clps_readl(UBRLCR(port));
|
|
if (break_state == -1)
|
|
ubrlcr |= UBRLCR_BREAK;
|
|
else
|
|
ubrlcr &= ~UBRLCR_BREAK;
|
|
clps_writel(ubrlcr, UBRLCR(port));
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
}
|
|
|
|
static int clps711xuart_startup(struct uart_port *port)
|
|
{
|
|
unsigned int syscon;
|
|
int retval;
|
|
|
|
tx_enabled(port) = 1;
|
|
|
|
/*
|
|
* Allocate the IRQs
|
|
*/
|
|
retval = request_irq(TX_IRQ(port), clps711xuart_int_tx, 0,
|
|
"clps711xuart_tx", port);
|
|
if (retval)
|
|
return retval;
|
|
|
|
retval = request_irq(RX_IRQ(port), clps711xuart_int_rx, 0,
|
|
"clps711xuart_rx", port);
|
|
if (retval) {
|
|
free_irq(TX_IRQ(port), port);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* enable the port
|
|
*/
|
|
syscon = clps_readl(SYSCON(port));
|
|
syscon |= SYSCON_UARTEN;
|
|
clps_writel(syscon, SYSCON(port));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void clps711xuart_shutdown(struct uart_port *port)
|
|
{
|
|
unsigned int ubrlcr, syscon;
|
|
|
|
/*
|
|
* Free the interrupt
|
|
*/
|
|
free_irq(TX_IRQ(port), port); /* TX interrupt */
|
|
free_irq(RX_IRQ(port), port); /* RX interrupt */
|
|
|
|
/*
|
|
* disable the port
|
|
*/
|
|
syscon = clps_readl(SYSCON(port));
|
|
syscon &= ~SYSCON_UARTEN;
|
|
clps_writel(syscon, SYSCON(port));
|
|
|
|
/*
|
|
* disable break condition and fifos
|
|
*/
|
|
ubrlcr = clps_readl(UBRLCR(port));
|
|
ubrlcr &= ~(UBRLCR_FIFOEN | UBRLCR_BREAK);
|
|
clps_writel(ubrlcr, UBRLCR(port));
|
|
}
|
|
|
|
static void
|
|
clps711xuart_set_termios(struct uart_port *port, struct termios *termios,
|
|
struct termios *old)
|
|
{
|
|
unsigned int ubrlcr, baud, quot;
|
|
unsigned long flags;
|
|
|
|
/*
|
|
* We don't implement CREAD.
|
|
*/
|
|
termios->c_cflag |= CREAD;
|
|
|
|
/*
|
|
* Ask the core to calculate the divisor for us.
|
|
*/
|
|
baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
|
|
quot = uart_get_divisor(port, baud);
|
|
|
|
switch (termios->c_cflag & CSIZE) {
|
|
case CS5:
|
|
ubrlcr = UBRLCR_WRDLEN5;
|
|
break;
|
|
case CS6:
|
|
ubrlcr = UBRLCR_WRDLEN6;
|
|
break;
|
|
case CS7:
|
|
ubrlcr = UBRLCR_WRDLEN7;
|
|
break;
|
|
default: // CS8
|
|
ubrlcr = UBRLCR_WRDLEN8;
|
|
break;
|
|
}
|
|
if (termios->c_cflag & CSTOPB)
|
|
ubrlcr |= UBRLCR_XSTOP;
|
|
if (termios->c_cflag & PARENB) {
|
|
ubrlcr |= UBRLCR_PRTEN;
|
|
if (!(termios->c_cflag & PARODD))
|
|
ubrlcr |= UBRLCR_EVENPRT;
|
|
}
|
|
if (port->fifosize > 1)
|
|
ubrlcr |= UBRLCR_FIFOEN;
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
|
|
/*
|
|
* Update the per-port timeout.
|
|
*/
|
|
uart_update_timeout(port, termios->c_cflag, baud);
|
|
|
|
port->read_status_mask = UARTDR_OVERR;
|
|
if (termios->c_iflag & INPCK)
|
|
port->read_status_mask |= UARTDR_PARERR | UARTDR_FRMERR;
|
|
|
|
/*
|
|
* Characters to ignore
|
|
*/
|
|
port->ignore_status_mask = 0;
|
|
if (termios->c_iflag & IGNPAR)
|
|
port->ignore_status_mask |= UARTDR_FRMERR | UARTDR_PARERR;
|
|
if (termios->c_iflag & IGNBRK) {
|
|
/*
|
|
* If we're ignoring parity and break indicators,
|
|
* ignore overruns to (for real raw support).
|
|
*/
|
|
if (termios->c_iflag & IGNPAR)
|
|
port->ignore_status_mask |= UARTDR_OVERR;
|
|
}
|
|
|
|
quot -= 1;
|
|
|
|
clps_writel(ubrlcr | quot, UBRLCR(port));
|
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
}
|
|
|
|
static const char *clps711xuart_type(struct uart_port *port)
|
|
{
|
|
return port->type == PORT_CLPS711X ? "CLPS711x" : NULL;
|
|
}
|
|
|
|
/*
|
|
* Configure/autoconfigure the port.
|
|
*/
|
|
static void clps711xuart_config_port(struct uart_port *port, int flags)
|
|
{
|
|
if (flags & UART_CONFIG_TYPE)
|
|
port->type = PORT_CLPS711X;
|
|
}
|
|
|
|
static void clps711xuart_release_port(struct uart_port *port)
|
|
{
|
|
}
|
|
|
|
static int clps711xuart_request_port(struct uart_port *port)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static struct uart_ops clps711x_pops = {
|
|
.tx_empty = clps711xuart_tx_empty,
|
|
.set_mctrl = clps711xuart_set_mctrl_null,
|
|
.get_mctrl = clps711xuart_get_mctrl,
|
|
.stop_tx = clps711xuart_stop_tx,
|
|
.start_tx = clps711xuart_start_tx,
|
|
.stop_rx = clps711xuart_stop_rx,
|
|
.enable_ms = clps711xuart_enable_ms,
|
|
.break_ctl = clps711xuart_break_ctl,
|
|
.startup = clps711xuart_startup,
|
|
.shutdown = clps711xuart_shutdown,
|
|
.set_termios = clps711xuart_set_termios,
|
|
.type = clps711xuart_type,
|
|
.config_port = clps711xuart_config_port,
|
|
.release_port = clps711xuart_release_port,
|
|
.request_port = clps711xuart_request_port,
|
|
};
|
|
|
|
static struct uart_port clps711x_ports[UART_NR] = {
|
|
{
|
|
.iobase = SYSCON1,
|
|
.irq = IRQ_UTXINT1, /* IRQ_URXINT1, IRQ_UMSINT */
|
|
.uartclk = 3686400,
|
|
.fifosize = 16,
|
|
.ops = &clps711x_pops,
|
|
.line = 0,
|
|
.flags = ASYNC_BOOT_AUTOCONF,
|
|
},
|
|
{
|
|
.iobase = SYSCON2,
|
|
.irq = IRQ_UTXINT2, /* IRQ_URXINT2 */
|
|
.uartclk = 3686400,
|
|
.fifosize = 16,
|
|
.ops = &clps711x_pops,
|
|
.line = 1,
|
|
.flags = ASYNC_BOOT_AUTOCONF,
|
|
}
|
|
};
|
|
|
|
#ifdef CONFIG_SERIAL_CLPS711X_CONSOLE
|
|
/*
|
|
* Print a string to the serial port trying not to disturb
|
|
* any possible real use of the port...
|
|
*
|
|
* The console_lock must be held when we get here.
|
|
*
|
|
* Note that this is called with interrupts already disabled
|
|
*/
|
|
static void
|
|
clps711xuart_console_write(struct console *co, const char *s,
|
|
unsigned int count)
|
|
{
|
|
struct uart_port *port = clps711x_ports + co->index;
|
|
unsigned int status, syscon;
|
|
int i;
|
|
|
|
/*
|
|
* Ensure that the port is enabled.
|
|
*/
|
|
syscon = clps_readl(SYSCON(port));
|
|
clps_writel(syscon | SYSCON_UARTEN, SYSCON(port));
|
|
|
|
/*
|
|
* Now, do each character
|
|
*/
|
|
for (i = 0; i < count; i++) {
|
|
do {
|
|
status = clps_readl(SYSFLG(port));
|
|
} while (status & SYSFLG_UTXFF);
|
|
clps_writel(s[i], UARTDR(port));
|
|
if (s[i] == '\n') {
|
|
do {
|
|
status = clps_readl(SYSFLG(port));
|
|
} while (status & SYSFLG_UTXFF);
|
|
clps_writel('\r', UARTDR(port));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Finally, wait for transmitter to become empty
|
|
* and restore the uart state.
|
|
*/
|
|
do {
|
|
status = clps_readl(SYSFLG(port));
|
|
} while (status & SYSFLG_UBUSY);
|
|
|
|
clps_writel(syscon, SYSCON(port));
|
|
}
|
|
|
|
static void __init
|
|
clps711xuart_console_get_options(struct uart_port *port, int *baud,
|
|
int *parity, int *bits)
|
|
{
|
|
if (clps_readl(SYSCON(port)) & SYSCON_UARTEN) {
|
|
unsigned int ubrlcr, quot;
|
|
|
|
ubrlcr = clps_readl(UBRLCR(port));
|
|
|
|
*parity = 'n';
|
|
if (ubrlcr & UBRLCR_PRTEN) {
|
|
if (ubrlcr & UBRLCR_EVENPRT)
|
|
*parity = 'e';
|
|
else
|
|
*parity = 'o';
|
|
}
|
|
|
|
if ((ubrlcr & UBRLCR_WRDLEN_MASK) == UBRLCR_WRDLEN7)
|
|
*bits = 7;
|
|
else
|
|
*bits = 8;
|
|
|
|
quot = ubrlcr & UBRLCR_BAUD_MASK;
|
|
*baud = port->uartclk / (16 * (quot + 1));
|
|
}
|
|
}
|
|
|
|
static int __init clps711xuart_console_setup(struct console *co, char *options)
|
|
{
|
|
struct uart_port *port;
|
|
int baud = 38400;
|
|
int bits = 8;
|
|
int parity = 'n';
|
|
int flow = 'n';
|
|
|
|
/*
|
|
* Check whether an invalid uart number has been specified, and
|
|
* if so, search for the first available port that does have
|
|
* console support.
|
|
*/
|
|
port = uart_get_console(clps711x_ports, UART_NR, co);
|
|
|
|
if (options)
|
|
uart_parse_options(options, &baud, &parity, &bits, &flow);
|
|
else
|
|
clps711xuart_console_get_options(port, &baud, &parity, &bits);
|
|
|
|
return uart_set_options(port, co, baud, parity, bits, flow);
|
|
}
|
|
|
|
static struct uart_driver clps711x_reg;
|
|
static struct console clps711x_console = {
|
|
.name = "ttyCL",
|
|
.write = clps711xuart_console_write,
|
|
.device = uart_console_device,
|
|
.setup = clps711xuart_console_setup,
|
|
.flags = CON_PRINTBUFFER,
|
|
.index = -1,
|
|
.data = &clps711x_reg,
|
|
};
|
|
|
|
static int __init clps711xuart_console_init(void)
|
|
{
|
|
register_console(&clps711x_console);
|
|
return 0;
|
|
}
|
|
console_initcall(clps711xuart_console_init);
|
|
|
|
#define CLPS711X_CONSOLE &clps711x_console
|
|
#else
|
|
#define CLPS711X_CONSOLE NULL
|
|
#endif
|
|
|
|
static struct uart_driver clps711x_reg = {
|
|
.driver_name = "ttyCL",
|
|
.dev_name = "ttyCL",
|
|
.major = SERIAL_CLPS711X_MAJOR,
|
|
.minor = SERIAL_CLPS711X_MINOR,
|
|
.nr = UART_NR,
|
|
|
|
.cons = CLPS711X_CONSOLE,
|
|
};
|
|
|
|
static int __init clps711xuart_init(void)
|
|
{
|
|
int ret, i;
|
|
|
|
printk(KERN_INFO "Serial: CLPS711x driver $Revision: 1.42 $\n");
|
|
|
|
ret = uart_register_driver(&clps711x_reg);
|
|
if (ret)
|
|
return ret;
|
|
|
|
for (i = 0; i < UART_NR; i++)
|
|
uart_add_one_port(&clps711x_reg, &clps711x_ports[i]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit clps711xuart_exit(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < UART_NR; i++)
|
|
uart_remove_one_port(&clps711x_reg, &clps711x_ports[i]);
|
|
|
|
uart_unregister_driver(&clps711x_reg);
|
|
}
|
|
|
|
module_init(clps711xuart_init);
|
|
module_exit(clps711xuart_exit);
|
|
|
|
MODULE_AUTHOR("Deep Blue Solutions Ltd");
|
|
MODULE_DESCRIPTION("CLPS-711x generic serial driver $Revision: 1.42 $");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_CHARDEV(SERIAL_CLPS711X_MAJOR, SERIAL_CLPS711X_MINOR);
|