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linux/drivers/serial/uart00.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

783 lines
18 KiB
C
Raw Blame History

/*
* linux/drivers/serial/uart00.c
*
* Driver for UART00 serial ports
*
* Based on drivers/char/serial_amba.c, by ARM Limited &
* Deep Blue Solutions Ltd.
* Copyright 2001 Altera Corporation
*
* Update for 2.6.4 by Dirk Behme <dirk.behme@de.bosch.com>
*
* 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: uart00.c,v 1.35 2002/07/28 10:03:28 rmk Exp $
*
*/
#include <linux/config.h>
#if defined(CONFIG_SERIAL_UART00_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/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
#include <linux/serial.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/sizes.h>
#include <asm/arch/excalibur.h>
#define UART00_TYPE (volatile unsigned int*)
#include <asm/arch/uart00.h>
#include <asm/arch/int_ctrl00.h>
#define UART_NR 2
#define SERIAL_UART00_NAME "ttyUA"
#define SERIAL_UART00_MAJOR 204
#define SERIAL_UART00_MINOR 16 /* Temporary - will change in future */
#define SERIAL_UART00_NR UART_NR
#define UART_PORT_SIZE 0x50
#define UART00_ISR_PASS_LIMIT 256
/*
* Access macros for the UART00 UARTs
*/
#define UART_GET_INT_STATUS(p) inl(UART_ISR((p)->membase))
#define UART_PUT_IES(p, c) outl(c,UART_IES((p)->membase))
#define UART_GET_IES(p) inl(UART_IES((p)->membase))
#define UART_PUT_IEC(p, c) outl(c,UART_IEC((p)->membase))
#define UART_GET_IEC(p) inl(UART_IEC((p)->membase))
#define UART_PUT_CHAR(p, c) outl(c,UART_TD((p)->membase))
#define UART_GET_CHAR(p) inl(UART_RD((p)->membase))
#define UART_GET_RSR(p) inl(UART_RSR((p)->membase))
#define UART_GET_RDS(p) inl(UART_RDS((p)->membase))
#define UART_GET_MSR(p) inl(UART_MSR((p)->membase))
#define UART_GET_MCR(p) inl(UART_MCR((p)->membase))
#define UART_PUT_MCR(p, c) outl(c,UART_MCR((p)->membase))
#define UART_GET_MC(p) inl(UART_MC((p)->membase))
#define UART_PUT_MC(p, c) outl(c,UART_MC((p)->membase))
#define UART_GET_TSR(p) inl(UART_TSR((p)->membase))
#define UART_GET_DIV_HI(p) inl(UART_DIV_HI((p)->membase))
#define UART_PUT_DIV_HI(p,c) outl(c,UART_DIV_HI((p)->membase))
#define UART_GET_DIV_LO(p) inl(UART_DIV_LO((p)->membase))
#define UART_PUT_DIV_LO(p,c) outl(c,UART_DIV_LO((p)->membase))
#define UART_RX_DATA(s) ((s) & UART_RSR_RX_LEVEL_MSK)
#define UART_TX_READY(s) (((s) & UART_TSR_TX_LEVEL_MSK) < 15)
//#define UART_TX_EMPTY(p) ((UART_GET_FR(p) & UART00_UARTFR_TMSK) == 0)
static void uart00_stop_tx(struct uart_port *port, unsigned int tty_stop)
{
UART_PUT_IEC(port, UART_IEC_TIE_MSK);
}
static void uart00_stop_rx(struct uart_port *port)
{
UART_PUT_IEC(port, UART_IEC_RE_MSK);
}
static void uart00_enable_ms(struct uart_port *port)
{
UART_PUT_IES(port, UART_IES_ME_MSK);
}
static void
uart00_rx_chars(struct uart_port *port, struct pt_regs *regs)
{
struct tty_struct *tty = port->info->tty;
unsigned int status, ch, rds, flg, ignored = 0;
status = UART_GET_RSR(port);
while (UART_RX_DATA(status)) {
/*
* We need to read rds before reading the
* character from the fifo
*/
rds = UART_GET_RDS(port);
ch = UART_GET_CHAR(port);
port->icount.rx++;
if (tty->flip.count >= TTY_FLIPBUF_SIZE)
goto ignore_char;
flg = TTY_NORMAL;
/*
* Note that the error handling code is
* out of the main execution path
*/
if (rds & (UART_RDS_BI_MSK |UART_RDS_FE_MSK|
UART_RDS_PE_MSK |UART_RDS_PE_MSK))
goto handle_error;
if (uart_handle_sysrq_char(port, ch, regs))
goto ignore_char;
error_return:
tty_insert_flip_char(tty, ch, flg);
ignore_char:
status = UART_GET_RSR(port);
}
out:
tty_flip_buffer_push(tty);
return;
handle_error:
if (rds & UART_RDS_BI_MSK) {
status &= ~(UART_RDS_FE_MSK | UART_RDS_PE_MSK);
port->icount.brk++;
if (uart_handle_break(port))
goto ignore_char;
} else if (rds & UART_RDS_PE_MSK)
port->icount.parity++;
else if (rds & UART_RDS_FE_MSK)
port->icount.frame++;
if (rds & UART_RDS_OE_MSK)
port->icount.overrun++;
if (rds & port->ignore_status_mask) {
if (++ignored > 100)
goto out;
goto ignore_char;
}
rds &= port->read_status_mask;
if (rds & UART_RDS_BI_MSK)
flg = TTY_BREAK;
else if (rds & UART_RDS_PE_MSK)
flg = TTY_PARITY;
else if (rds & UART_RDS_FE_MSK)
flg = TTY_FRAME;
if (rds & UART_RDS_OE_MSK) {
/*
* CHECK: does overrun affect the current character?
* ASSUMPTION: it does not.
*/
tty_insert_flip_char(tty, ch, flg);
ch = 0;
flg = TTY_OVERRUN;
}
#ifdef SUPPORT_SYSRQ
port->sysrq = 0;
#endif
goto error_return;
}
static void uart00_tx_chars(struct uart_port *port)
{
struct circ_buf *xmit = &port->info->xmit;
int count;
if (port->x_char) {
while ((UART_GET_TSR(port) & UART_TSR_TX_LEVEL_MSK) == 15)
barrier();
UART_PUT_CHAR(port, port->x_char);
port->icount.tx++;
port->x_char = 0;
return;
}
if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
uart00_stop_tx(port, 0);
return;
}
count = port->fifosize >> 1;
do {
while ((UART_GET_TSR(port) & UART_TSR_TX_LEVEL_MSK) == 15)
barrier();
UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
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))
uart00_stop_tx(port, 0);
}
static void uart00_start_tx(struct uart_port *port, unsigned int tty_start)
{
UART_PUT_IES(port, UART_IES_TIE_MSK);
uart00_tx_chars(port);
}
static void uart00_modem_status(struct uart_port *port)
{
unsigned int status;
status = UART_GET_MSR(port);
if (!(status & (UART_MSR_DCTS_MSK | UART_MSR_DDSR_MSK |
UART_MSR_TERI_MSK | UART_MSR_DDCD_MSK)))
return;
if (status & UART_MSR_DDCD_MSK)
uart_handle_dcd_change(port, status & UART_MSR_DCD_MSK);
if (status & UART_MSR_DDSR_MSK)
port->icount.dsr++;
if (status & UART_MSR_DCTS_MSK)
uart_handle_cts_change(port, status & UART_MSR_CTS_MSK);
wake_up_interruptible(&port->info->delta_msr_wait);
}
static irqreturn_t uart00_int(int irq, void *dev_id, struct pt_regs *regs)
{
struct uart_port *port = dev_id;
unsigned int status, pass_counter = 0;
status = UART_GET_INT_STATUS(port);
do {
if (status & UART_ISR_RI_MSK)
uart00_rx_chars(port, regs);
if (status & UART_ISR_MI_MSK)
uart00_modem_status(port);
if (status & (UART_ISR_TI_MSK | UART_ISR_TII_MSK))
uart00_tx_chars(port);
if (pass_counter++ > UART00_ISR_PASS_LIMIT)
break;
status = UART_GET_INT_STATUS(port);
} while (status);
return IRQ_HANDLED;
}
static unsigned int uart00_tx_empty(struct uart_port *port)
{
return UART_GET_TSR(port) & UART_TSR_TX_LEVEL_MSK? 0 : TIOCSER_TEMT;
}
static unsigned int uart00_get_mctrl(struct uart_port *port)
{
unsigned int result = 0;
unsigned int status;
status = UART_GET_MSR(port);
if (status & UART_MSR_DCD_MSK)
result |= TIOCM_CAR;
if (status & UART_MSR_DSR_MSK)
result |= TIOCM_DSR;
if (status & UART_MSR_CTS_MSK)
result |= TIOCM_CTS;
if (status & UART_MSR_RI_MSK)
result |= TIOCM_RI;
return result;
}
static void uart00_set_mctrl_null(struct uart_port *port, unsigned int mctrl)
{
}
static void uart00_break_ctl(struct uart_port *port, int break_state)
{
unsigned long flags;
unsigned int mcr;
spin_lock_irqsave(&port->lock, flags);
mcr = UART_GET_MCR(port);
if (break_state == -1)
mcr |= UART_MCR_BR_MSK;
else
mcr &= ~UART_MCR_BR_MSK;
UART_PUT_MCR(port, mcr);
spin_unlock_irqrestore(&port->lock, flags);
}
static void
uart00_set_termios(struct uart_port *port, struct termios *termios,
struct termios *old)
{
unsigned int uart_mc, old_ies, baud, quot;
unsigned long flags;
/*
* We don't support CREAD (yet)
*/
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);
/* byte size and parity */
switch (termios->c_cflag & CSIZE) {
case CS5:
uart_mc = UART_MC_CLS_CHARLEN_5;
break;
case CS6:
uart_mc = UART_MC_CLS_CHARLEN_6;
break;
case CS7:
uart_mc = UART_MC_CLS_CHARLEN_7;
break;
default: // CS8
uart_mc = UART_MC_CLS_CHARLEN_8;
break;
}
if (termios->c_cflag & CSTOPB)
uart_mc|= UART_MC_ST_TWO;
if (termios->c_cflag & PARENB) {
uart_mc |= UART_MC_PE_MSK;
if (!(termios->c_cflag & PARODD))
uart_mc |= UART_MC_EP_MSK;
}
spin_lock_irqsave(&port->lock, flags);
/*
* Update the per-port timeout.
*/
uart_update_timeout(port, termios->c_cflag, baud);
port->read_status_mask = UART_RDS_OE_MSK;
if (termios->c_iflag & INPCK)
port->read_status_mask |= UART_RDS_FE_MSK | UART_RDS_PE_MSK;
if (termios->c_iflag & (BRKINT | PARMRK))
port->read_status_mask |= UART_RDS_BI_MSK;
/*
* Characters to ignore
*/
port->ignore_status_mask = 0;
if (termios->c_iflag & IGNPAR)
port->ignore_status_mask |= UART_RDS_FE_MSK | UART_RDS_PE_MSK;
if (termios->c_iflag & IGNBRK) {
port->ignore_status_mask |= UART_RDS_BI_MSK;
/*
* If we're ignoring parity and break indicators,
* ignore overruns to (for real raw support).
*/
if (termios->c_iflag & IGNPAR)
port->ignore_status_mask |= UART_RDS_OE_MSK;
}
/* first, disable everything */
old_ies = UART_GET_IES(port);
if (UART_ENABLE_MS(port, termios->c_cflag))
old_ies |= UART_IES_ME_MSK;
/* Set baud rate */
UART_PUT_DIV_LO(port, (quot & 0xff));
UART_PUT_DIV_HI(port, ((quot & 0xf00) >> 8));
UART_PUT_MC(port, uart_mc);
UART_PUT_IES(port, old_ies);
spin_unlock_irqrestore(&port->lock, flags);
}
static int uart00_startup(struct uart_port *port)
{
int result;
/*
* Allocate the IRQ
*/
result = request_irq(port->irq, uart00_int, 0, "uart00", port);
if (result) {
printk(KERN_ERR "Request of irq %d failed\n", port->irq);
return result;
}
/*
* Finally, enable interrupts. Use the TII interrupt to minimise
* the number of interrupts generated. If higher performance is
* needed, consider using the TI interrupt with a suitable FIFO
* threshold
*/
UART_PUT_IES(port, UART_IES_RE_MSK | UART_IES_TIE_MSK);
return 0;
}
static void uart00_shutdown(struct uart_port *port)
{
/*
* disable all interrupts, disable the port
*/
UART_PUT_IEC(port, 0xff);
/* disable break condition and fifos */
UART_PUT_MCR(port, UART_GET_MCR(port) &~UART_MCR_BR_MSK);
/*
* Free the interrupt
*/
free_irq(port->irq, port);
}
static const char *uart00_type(struct uart_port *port)
{
return port->type == PORT_UART00 ? "Altera UART00" : NULL;
}
/*
* Release the memory region(s) being used by 'port'
*/
static void uart00_release_port(struct uart_port *port)
{
release_mem_region(port->mapbase, UART_PORT_SIZE);
#ifdef CONFIG_ARCH_CAMELOT
if (port->membase != (void*)IO_ADDRESS(EXC_UART00_BASE)) {
iounmap(port->membase);
}
#endif
}
/*
* Request the memory region(s) being used by 'port'
*/
static int uart00_request_port(struct uart_port *port)
{
return request_mem_region(port->mapbase, UART_PORT_SIZE, "serial_uart00")
!= NULL ? 0 : -EBUSY;
}
/*
* Configure/autoconfigure the port.
*/
static void uart00_config_port(struct uart_port *port, int flags)
{
/*
* Map the io memory if this is a soft uart
*/
if (!port->membase)
port->membase = ioremap_nocache(port->mapbase,SZ_4K);
if (!port->membase)
printk(KERN_ERR "serial00: cannot map io memory\n");
else
port->type = PORT_UART00;
}
/*
* verify the new serial_struct (for TIOCSSERIAL).
*/
static int uart00_verify_port(struct uart_port *port, struct serial_struct *ser)
{
int ret = 0;
if (ser->type != PORT_UNKNOWN && ser->type != PORT_UART00)
ret = -EINVAL;
if (ser->irq < 0 || ser->irq >= NR_IRQS)
ret = -EINVAL;
if (ser->baud_base < 9600)
ret = -EINVAL;
return ret;
}
static struct uart_ops uart00_pops = {
.tx_empty = uart00_tx_empty,
.set_mctrl = uart00_set_mctrl_null,
.get_mctrl = uart00_get_mctrl,
.stop_tx = uart00_stop_tx,
.start_tx = uart00_start_tx,
.stop_rx = uart00_stop_rx,
.enable_ms = uart00_enable_ms,
.break_ctl = uart00_break_ctl,
.startup = uart00_startup,
.shutdown = uart00_shutdown,
.set_termios = uart00_set_termios,
.type = uart00_type,
.release_port = uart00_release_port,
.request_port = uart00_request_port,
.config_port = uart00_config_port,
.verify_port = uart00_verify_port,
};
#ifdef CONFIG_ARCH_CAMELOT
static struct uart_port epxa10db_port = {
.membase = (void*)IO_ADDRESS(EXC_UART00_BASE),
.mapbase = EXC_UART00_BASE,
.iotype = SERIAL_IO_MEM,
.irq = IRQ_UART,
.uartclk = EXC_AHB2_CLK_FREQUENCY,
.fifosize = 16,
.ops = &uart00_pops,
.flags = ASYNC_BOOT_AUTOCONF,
};
#endif
#ifdef CONFIG_SERIAL_UART00_CONSOLE
static void uart00_console_write(struct console *co, const char *s, unsigned count)
{
#ifdef CONFIG_ARCH_CAMELOT
struct uart_port *port = &epxa10db_port;
unsigned int status, old_ies;
int i;
/*
* First save the CR then disable the interrupts
*/
old_ies = UART_GET_IES(port);
UART_PUT_IEC(port,0xff);
/*
* Now, do each character
*/
for (i = 0; i < count; i++) {
do {
status = UART_GET_TSR(port);
} while (!UART_TX_READY(status));
UART_PUT_CHAR(port, s[i]);
if (s[i] == '\n') {
do {
status = UART_GET_TSR(port);
} while (!UART_TX_READY(status));
UART_PUT_CHAR(port, '\r');
}
}
/*
* Finally, wait for transmitter to become empty
* and restore the IES
*/
do {
status = UART_GET_TSR(port);
} while (status & UART_TSR_TX_LEVEL_MSK);
UART_PUT_IES(port, old_ies);
#endif
}
static void __init
uart00_console_get_options(struct uart_port *port, int *baud,
int *parity, int *bits)
{
unsigned int uart_mc, quot;
uart_mc = UART_GET_MC(port);
*parity = 'n';
if (uart_mc & UART_MC_PE_MSK) {
if (uart_mc & UART_MC_EP_MSK)
*parity = 'e';
else
*parity = 'o';
}
switch (uart_mc & UART_MC_CLS_MSK) {
case UART_MC_CLS_CHARLEN_5:
*bits = 5;
break;
case UART_MC_CLS_CHARLEN_6:
*bits = 6;
break;
case UART_MC_CLS_CHARLEN_7:
*bits = 7;
break;
case UART_MC_CLS_CHARLEN_8:
*bits = 8;
break;
}
quot = UART_GET_DIV_LO(port) | (UART_GET_DIV_HI(port) << 8);
*baud = port->uartclk / (16 *quot );
}
static int __init uart00_console_setup(struct console *co, char *options)
{
struct uart_port *port;
int baud = 115200;
int bits = 8;
int parity = 'n';
int flow = 'n';
#ifdef CONFIG_ARCH_CAMELOT
port = &epxa10db_port; ;
#else
return -ENODEV;
#endif
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
else
uart00_console_get_options(port, &baud, &parity, &bits);
return uart_set_options(port, co, baud, parity, bits, flow);
}
extern struct uart_driver uart00_reg;
static struct console uart00_console = {
.name = SERIAL_UART00_NAME,
.write = uart00_console_write,
.device = uart_console_device,
.setup = uart00_console_setup,
.flags = CON_PRINTBUFFER,
.index = 0,
.data = &uart00_reg,
};
static int __init uart00_console_init(void)
{
register_console(&uart00_console);
return 0;
}
console_initcall(uart00_console_init);
#define UART00_CONSOLE &uart00_console
#else
#define UART00_CONSOLE NULL
#endif
static struct uart_driver uart00_reg = {
.owner = NULL,
.driver_name = SERIAL_UART00_NAME,
.dev_name = SERIAL_UART00_NAME,
.major = SERIAL_UART00_MAJOR,
.minor = SERIAL_UART00_MINOR,
.nr = UART_NR,
.cons = UART00_CONSOLE,
};
struct dev_port_entry{
unsigned int base_addr;
struct uart_port *port;
};
#ifdef CONFIG_PLD_HOTSWAP
static struct dev_port_entry dev_port_map[UART_NR];
/*
* Keep a mapping of dev_info addresses -> port lines to use when
* removing ports dev==NULL indicates unused entry
*/
struct uart00_ps_data{
unsigned int clk;
unsigned int fifosize;
};
int uart00_add_device(struct pldhs_dev_info* dev_info, void* dev_ps_data)
{
struct uart00_ps_data* dev_ps=dev_ps_data;
struct uart_port * port;
int i,result;
i=0;
while(dev_port_map[i].port)
i++;
if(i==UART_NR){
printk(KERN_WARNING "uart00: Maximum number of ports reached\n");
return 0;
}
port=kmalloc(sizeof(struct uart_port),GFP_KERNEL);
if(!port)
return -ENOMEM;
printk("clk=%d fifo=%d\n",dev_ps->clk,dev_ps->fifosize);
port->membase=0;
port->mapbase=dev_info->base_addr;
port->iotype=SERIAL_IO_MEM;
port->irq=dev_info->irq;
port->uartclk=dev_ps->clk;
port->fifosize=dev_ps->fifosize;
port->ops=&uart00_pops;
port->line=i;
port->flags=ASYNC_BOOT_AUTOCONF;
result=uart_add_one_port(&uart00_reg, port);
if(result){
printk("uart_add_one_port returned %d\n",result);
return result;
}
dev_port_map[i].base_addr=dev_info->base_addr;
dev_port_map[i].port=port;
printk("uart00: added device at %x as ttyUA%d\n",dev_port_map[i].base_addr,i);
return 0;
}
int uart00_remove_devices(void)
{
int i,result;
result=0;
for(i=1;i<UART_NR;i++){
if(dev_port_map[i].base_addr){
result=uart_remove_one_port(&uart00_reg, dev_port_map[i].port);
if(result)
return result;
/* port removed sucessfully, so now tidy up */
kfree(dev_port_map[i].port);
dev_port_map[i].base_addr=0;
dev_port_map[i].port=NULL;
}
}
return 0;
}
struct pld_hotswap_ops uart00_pldhs_ops={
.name = "uart00",
.add_device = uart00_add_device,
.remove_devices = uart00_remove_devices,
};
#endif
static int __init uart00_init(void)
{
int result;
printk(KERN_INFO "Serial: UART00 driver $Revision: 1.35 $\n");
printk(KERN_WARNING "serial_uart00:Using temporary major/minor pairs"
" - these WILL change in the future\n");
result = uart_register_driver(&uart00_reg);
if (result)
return result;
#ifdef CONFIG_ARCH_CAMELOT
result = uart_add_one_port(&uart00_reg,&epxa10db_port);
#endif
if (result)
uart_unregister_driver(&uart00_reg);
#ifdef CONFIG_PLD_HOTSWAP
pldhs_register_driver(&uart00_pldhs_ops);
#endif
return result;
}
__initcall(uart00_init);
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