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Commit 1a634bdd authored by Ben Dooks's avatar Ben Dooks Committed by Russell King
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[ARM PATCH] 2234/3: S3C2410 - new serial driver (1/4) 

Patch from Ben Dooks

S3C2410/S3C2440 new serial driver

this patch includes the following

- clock selection using clock core
- handling for both 2410 and 2440 uarts
- uart suspend/resume support
- Dimitry Andric's fix for un-initialised spinlocks
- Herbert Poetzl's fixes for the following
-> break character recognition
-> Magic-SYSRQ handling
-> Uart software flow control (IrDA console)

Updated to include rmk's comments from Patch #2234/1
and fix a few checks for serial clocks, as well as
merging fixes from rmk that had taken time to go
through the biteepr to release.

Signed-off-by: Ben Dooks
Signed-off-by: Russell King
parent 1fc697f9
Hide whitespace changes
Inline Side-by-side
Showing with 1169 additions and 351 deletions
drivers/serial/s3c2410.c
View file @ 1a634bdd
/*
* linux/drivers/char/s3c2410.c
* linux/drivers/serial/s3c2410.c
*
* Driver for onboard UARTs on the Samsung S3C2410
* Driver for onboard UARTs on the Samsung S3C24XX
*
* Based on drivers/char/serial.c and drivers/char/21285.c
*
......@@ -9,55 +9,153 @@
*
* Changelog:
*
*/
* 22-Jul-2004 BJD Finished off device rewrite
*
* 21-Jul-2004 BJD Thanks to <herbet@13thfloor.at> for pointing out
* problems with baud rate and loss of IR settings. Update
* to add configuration via platform_device structure
*
* 28-Sep-2004 BJD Re-write for the following items
* - S3C2410 and S3C2440 serial support
* - Power Management support
* - Fix console via IrDA devices
* - SysReq (Herbert Ptzl)
* - Break character handling (Herbert Ptzl)
* - spin-lock initialisation (Dimitry Andric)
* - added clock control
* - updated init code to use platform_device info
*/
/* Hote on 2410 error handling
*
* The s3c2410 manual has a love/hate affair with the contents of the
* UERSTAT register in the UART blocks, and keeps marking some of the
* error bits as reserved. Having checked with the s3c2410x01,
* it copes with BREAKs properly, so I am happy to ignore the RESERVED
* feature from the latter versions of the manual.
*
* If it becomes aparrent that latter versions of the 2410 remove these
* bits, then action will have to be taken to differentiate the versions
* and change the policy on BREAK
*
* BJD, 04-Nov-2004
*/
#include <linux/config.h>
#if defined(CONFIG_SERIAL_S3C2410_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include <linux/module.h>
#include <linux/tty.h>
#include <linux/ioport.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/sysrq.h>
#include <linux/console.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
#include <linux/serial.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/hardware.h>
#include <asm/hardware/clock.h>
#include <asm/arch/regs-serial.h>
#include <asm/arch/regs-gpio.h>
#include <asm/mach-types.h>
/* structures */
struct s3c24xx_uart_info {
char *name;
unsigned int type;
unsigned int fifosize;
unsigned long rx_fifomask;
unsigned long rx_fifoshift;
unsigned long tx_fifomask;
unsigned long tx_fifoshift;
unsigned long tx_fifofull;
/* clock source control */
int (*get_clksrc)(struct uart_port *, struct s3c24xx_uart_clksrc *clk);
int (*set_clksrc)(struct uart_port *, struct s3c24xx_uart_clksrc *clk);
};
struct s3c24xx_uart_port {
unsigned char rx_claimed;
unsigned char tx_claimed;
struct s3c24xx_uart_info *info;
struct s3c24xx_uart_clksrc *clksrc;
struct clk *clk;
struct clk *baudclk;
struct uart_port port;
};
/* configuration defines */
#if 0
#include <asm/debug-ll.h>
#define dbg(x...) llprintk(x)
#if 1
/* send debug to the low-level output routines */
extern void printascii(const char *);
static void
s3c24xx_serial_dbg(const char *fmt, ...)
{
va_list va;
char buff[256];
va_start(va, fmt);
vsprintf(buff, fmt, va);
va_end(va);
printascii(buff);
}
#define dbg(x...) s3c24xx_serial_dbg(x)
#else
#define dbg(x...)
#define dbg(x...) printk(KERN_DEBUG "s3c24xx: ");
#endif
#else /* no debug */
#define dbg(x...) do {} while(0)
#endif
#define SERIAL_S3C2410_NAME "ttySAC"
#define SERIAL_S3C2410_MAJOR 204
#define SERIAL_S3C2410_MINOR 64
/* UART name and device definitions */
#define S3C24XX_SERIAL_NAME "ttySAC"
#define S3C24XX_SERIAL_DEVFS "tts/"
#define S3C24XX_SERIAL_MAJOR 204
#define S3C24XX_SERIAL_MINOR 64
/* conversion functions */
#define s3c24xx_dev_to_port(__dev) (struct uart_port *)dev_get_drvdata(__dev)
#define s3c24xx_dev_to_cfg(__dev) (struct s3c2410_uartcfg *)((__dev)->platform_data)
/* we can support 3 uarts, but not always use them */
#define NR_PORTS (3)
static const char serial_s3c2410_name[] = "Samsung S3C2410 UART";
/* port irq numbers */
#define TX_IRQ(port) ((port)->irq + 1)
#define RX_IRQ(port) ((port)->irq)
#define tx_enabled(port) ((port)->unused[0])
#define rx_enabled(port) ((port)->unused[1])
/* flag to ignore all characters comming in */
#define RXSTAT_DUMMY_READ (0x10000000)
/* register access controls */
/* access functions */
#define portaddr(port, reg) ((void *)((port)->membase + (reg)))
#define portaddr(port, reg) ((port)->membase + (reg))
#define rd_regb(port, reg) (__raw_readb(portaddr(port, reg)))
#define rd_regl(port, reg) (__raw_readl(portaddr(port, reg)))
......@@ -68,102 +166,230 @@ static const char serial_s3c2410_name[] = "Samsung S3C2410 UART";
#define wr_regl(port, reg, val) \
do { __raw_writel(val, portaddr(port, reg)); } while(0)
/* macros to change one thing to another */
#define tx_enabled(port) ((port)->unused[0])
#define rx_enabled(port) ((port)->unused[1])
/* flag to ignore all characters comming in */
#define RXSTAT_DUMMY_READ (0x10000000)
static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port)
{
return container_of(port, struct s3c24xx_uart_port, port);
}
/* translate a port to the device name */
static inline char *s3c24xx_serial_portname(struct uart_port *port)
{
return to_platform_device(port->dev)->name;
}
static int s3c24xx_serial_txempty_nofifo(struct uart_port *port)
{
return (rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE);
}
static void s3c24xx_serial_rx_enable(struct uart_port *port)
{
unsigned long flags;
unsigned int ucon, ufcon;
int count = 10000;
spin_lock_irqsave(&port->lock, flags);
while (--count && !s3c24xx_serial_txempty_nofifo(port))
udelay(100);
ufcon = rd_regl(port, S3C2410_UFCON);
ufcon |= S3C2410_UFCON_RESETRX;
wr_regl(port, S3C2410_UFCON, ufcon);
ucon = rd_regl(port, S3C2410_UCON);
ucon |= S3C2410_UCON_RXIRQMODE;
wr_regl(port, S3C2410_UCON, ucon);
rx_enabled(port) = 1;
spin_unlock_irqrestore(&port->lock, flags);
}
static void s3c24xx_serial_rx_disable(struct uart_port *port)
{
unsigned long flags;
unsigned int ucon;
spin_lock_irqsave(&port->lock, flags);
ucon = rd_regl(port, S3C2410_UCON);
ucon &= ~S3C2410_UCON_RXIRQMODE;
wr_regl(port, S3C2410_UCON, ucon);
/* code */
rx_enabled(port) = 0;
spin_unlock_irqrestore(&port->lock, flags);
}
static void
serial_s3c2410_stop_tx(struct uart_port *port, unsigned int tty_stop)
s3c24xx_serial_stop_tx(struct uart_port *port, unsigned int tty_stop)
{
if (tx_enabled(port)) {
disable_irq(TX_IRQ(port));
tx_enabled(port) = 0;
if (port->flags & UPF_CONS_FLOW)
s3c24xx_serial_rx_enable(port);
}
}
static void
serial_s3c2410_start_tx(struct uart_port *port, unsigned int tty_start)
s3c24xx_serial_start_tx(struct uart_port *port, unsigned int tty_start)
{
if (!tx_enabled(port)) {
if (port->flags & UPF_CONS_FLOW)
s3c24xx_serial_rx_disable(port);
enable_irq(TX_IRQ(port));
tx_enabled(port) = 1;
}
}
static void serial_s3c2410_stop_rx(struct uart_port *port)
static void s3c24xx_serial_stop_rx(struct uart_port *port)
{
if (rx_enabled(port)) {
dbg("serial_s3c2410_stop_rx: port=%p\n", port);
dbg("s3c24xx_serial_stop_rx: port=%p\n", port);
disable_irq(RX_IRQ(port));
rx_enabled(port) = 0;
}
}
static void serial_s3c2410_enable_ms(struct uart_port *port)
static void s3c24xx_serial_enable_ms(struct uart_port *port)
{
}
static inline struct s3c24xx_uart_info *s3c24xx_port_to_info(struct uart_port *port)
{
return to_ourport(port)->info;
}
static inline struct s3c2410_uartcfg *s3c24xx_port_to_cfg(struct uart_port *port)
{
if (port->dev == NULL)
return NULL;
return (struct s3c2410_uartcfg *)port->dev->platform_data;
}
static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport,
unsigned long ufstat)
{
struct s3c24xx_uart_info *info = ourport->info;
return (ufstat & info->rx_fifomask) >> info->rx_fifoshift;
}
/* ? - where has parity gone?? */
#define S3C2410_UERSTAT_PARITY (0x1000)
static irqreturn_t
serial_s3c2410_rx_chars(int irq, void *dev_id, struct pt_regs *regs)
s3c24xx_serial_rx_chars(int irq, void *dev_id, struct pt_regs *regs)
{
struct uart_port *port = dev_id;
struct s3c24xx_uart_port *ourport = dev_id;
struct uart_port *port = &ourport->port;
struct tty_struct *tty = port->info->tty;
unsigned int ufcon, ch, flag, rxs, ufstat;
int max_count = 256;
unsigned int ufcon, ch, flag, ufstat, uerstat;
int max_count = 64;
while (max_count-- > 0) {
ufcon = rd_regl(port, S3C2410_UFCON);
ufstat = rd_regl(port, S3C2410_UFSTAT);
if (S3C2410_UFCON_RXC(ufstat) == 0)
if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
break;
if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
if (tty->low_latency)
tty_flip_buffer_push(tty);
/*
* If this failed then we will throw away the
* bytes but must do so to clear interrupts
*/
}
uerstat = rd_regl(port, S3C2410_UERSTAT);
ch = rd_regb(port, S3C2410_URXH);
if (port->flags & UPF_CONS_FLOW) {
int txe = s3c24xx_serial_txempty_nofifo(port);
if (rx_enabled(port)) {
if (!txe) {
rx_enabled(port) = 0;
continue;
}
} else {
if (txe) {
ufcon |= S3C2410_UFCON_RESETRX;
wr_regl(port, S3C2410_UFCON, ufcon);
rx_enabled(port) = 1;
goto out;
}
continue;
}
}
/* insert the character into the buffer */
flag = TTY_NORMAL;
port->icount.rx++;
rxs = rd_regb(port, S3C2410_UERSTAT) | RXSTAT_DUMMY_READ;
if (uerstat & S3C2410_UERSTAT_ANY) {
dbg("rxerr: port ch=0x%02x, rxs=0x%08x\n",
ch, uerstat);
/* check for break */
if (uerstat & S3C2410_UERSTAT_BREAK) {
dbg("break!\n");
port->icount.brk++;
if (uart_handle_break(port))
goto ignore_char;
}
if (rxs & S3C2410_UERSTAT_ANY) {
if (rxs & S3C2410_UERSTAT_FRAME)
if (uerstat & S3C2410_UERSTAT_FRAME)
port->icount.frame++;
if (rxs & S3C2410_UERSTAT_OVERRUN)
if (uerstat & S3C2410_UERSTAT_OVERRUN)
port->icount.overrun++;
rxs &= port->read_status_mask;
uerstat &= port->read_status_mask;
if (rxs & S3C2410_UERSTAT_PARITY)
if (uerstat & S3C2410_UERSTAT_BREAK)
flag = TTY_BREAK;
else if (uerstat & S3C2410_UERSTAT_PARITY)
flag = TTY_PARITY;
else if (rxs & ( S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_OVERRUN))
else if (uerstat & ( S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_OVERRUN))
flag = TTY_FRAME;
}
if ((rxs & port->ignore_status_mask) == 0) {
if (uart_handle_sysrq_char(port, ch, regs))
goto ignore_char;
if ((uerstat & port->ignore_status_mask) == 0) {
tty_insert_flip_char(tty, ch, flag);
}
if ((rxs & S3C2410_UERSTAT_OVERRUN) &&
if ((uerstat & S3C2410_UERSTAT_OVERRUN) &&
tty->flip.count < TTY_FLIPBUF_SIZE) {
/*
* Overrun is special, since it's reported
* immediately, and doesn't affect the current
* character.
*/
tty_insert_flip_char(tty, 0, TTY_OVERRUN);
}
ignore_char:
continue;
}
tty_flip_buffer_push(tty);
......@@ -171,10 +397,10 @@ serial_s3c2410_rx_chars(int irq, void *dev_id, struct pt_regs *regs)
return IRQ_HANDLED;
}
static irqreturn_t
serial_s3c2410_tx_chars(int irq, void *dev_id, struct pt_regs *regs)
static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id, struct pt_regs *regs)
{
struct uart_port *port = (struct uart_port *)dev_id;
struct s3c24xx_uart_port *ourport = id;
struct uart_port *port = &ourport->port;
struct circ_buf *xmit = &port->info->xmit;
int count = 256;
......@@ -190,14 +416,14 @@ serial_s3c2410_tx_chars(int irq, void *dev_id, struct pt_regs *regs)
*/
if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
serial_s3c2410_stop_tx(port, 0);
s3c24xx_serial_stop_tx(port, 0);
goto out;
}
/* try and drain the buffer... */
while (!uart_circ_empty(xmit) && count-- > 0) {
if (rd_regl(port, S3C2410_UFSTAT) & S3C2410_UFSTAT_TXFULL)
if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
break;
wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
......@@ -209,22 +435,31 @@ serial_s3c2410_tx_chars(int irq, void *dev_id, struct pt_regs *regs)
uart_write_wakeup(port);
if (uart_circ_empty(xmit))
serial_s3c2410_stop_tx(port, 0);
s3c24xx_serial_stop_tx(port, 0);
out:
return IRQ_HANDLED;
}
static unsigned int
serial_s3c2410_tx_empty(struct uart_port *port)
static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
{
unsigned int ufcon = rd_regl(port, S3C2410_UFCON);
return (S3C2410_UFCON_TXC(ufcon) != 0) ? 0 : TIOCSER_TEMT;
struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT);
unsigned long ufcon = rd_regl(port, S3C2410_UFCON);
if (ufcon & S3C2410_UFCON_FIFOMODE) {
if ((ufstat & info->tx_fifomask) != 0 ||
(ufstat & info->tx_fifofull))
return 0;
return 1;
}
return s3c24xx_serial_txempty_nofifo(port);
}
/* no modem control lines */
static unsigned int
serial_s3c2410_get_mctrl(struct uart_port *port)
static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
{
unsigned int umstat = rd_regb(port,S3C2410_UMSTAT);
......@@ -234,13 +469,12 @@ serial_s3c2410_get_mctrl(struct uart_port *port)
return TIOCM_CAR | TIOCM_DSR;
}
static void
serial_s3c2410_set_mctrl(struct uart_port *port, unsigned int mctrl)
static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
/* todo - possibly remove AFC and do manual CTS */
}
static void serial_s3c2410_break_ctl(struct uart_port *port, int break_state)
static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state)
{
unsigned long flags;
unsigned int ucon;
......@@ -259,46 +493,250 @@ static void serial_s3c2410_break_ctl(struct uart_port *port, int break_state)
spin_unlock_irqrestore(&port->lock, flags);
}
static int serial_s3c2410_startup(struct uart_port *port)
static void s3c24xx_serial_shutdown(struct uart_port *port)
{
struct s3c24xx_uart_port *ourport = to_ourport(port);
if (ourport->tx_claimed) {
free_irq(TX_IRQ(port), ourport);
tx_enabled(port) = 0;
ourport->tx_claimed = 0;
}
if (ourport->rx_claimed) {
free_irq(RX_IRQ(port), ourport);
ourport->rx_claimed = 0;
rx_enabled(port) = 0;
}
}
static int s3c24xx_serial_startup(struct uart_port *port)
{
struct s3c24xx_uart_port *ourport = to_ourport(port);
unsigned long flags;
int ret;
tx_enabled(port) = 1;
rx_enabled(port) = 1;
dbg("s3c24xx_serial_startup: port=%p (%08lx,%p)\n",
port->mapbase, port->membase);
local_irq_save(flags);
dbg("serial_s3c2410_startup: port=%p (%p)\n",
port, port->mapbase);
rx_enabled(port) = 1;
ret = request_irq(RX_IRQ(port), serial_s3c2410_rx_chars, 0,
serial_s3c2410_name, port);
ret = request_irq(RX_IRQ(port),
s3c24xx_serial_rx_chars, 0,
s3c24xx_serial_portname(port), ourport);
if (ret != 0)
if (ret != 0) {
printk(KERN_ERR "cannot get irq %d\n", RX_IRQ(port));
return ret;
}
ourport->rx_claimed = 1;
dbg("requesting tx irq...\n");
tx_enabled(port) = 1;
ret = request_irq(TX_IRQ(port), serial_s3c2410_tx_chars, 0,
serial_s3c2410_name, port);
ret = request_irq(TX_IRQ(port),
s3c24xx_serial_tx_chars, 0,
s3c24xx_serial_portname(port), ourport);
if (ret) {
free_irq(RX_IRQ(port), port);
return ret;
printk(KERN_ERR "cannot get irq %d\n", TX_IRQ(port));
goto err;
}
ourport->tx_claimed = 1;
dbg("s3c24xx_serial_startup ok\n");
/* the port reset code should have done the correct
* register setup for the port controls */
local_irq_restore(flags);
return ret;
err:
s3c24xx_serial_shutdown(port);
local_irq_restore(flags);
return ret;
}
static void serial_s3c2410_shutdown(struct uart_port *port)
/* power power management control */
static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
unsigned int old)
{
free_irq(TX_IRQ(port), port);
free_irq(RX_IRQ(port), port);
struct s3c24xx_uart_port *ourport = to_ourport(port);
switch (level) {
case 3:
if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL)
clk_disable(ourport->baudclk);
clk_disable(ourport->clk);
break;
case 0:
clk_enable(ourport->clk);
if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL)
clk_enable(ourport->baudclk);
break;
default:
printk(KERN_ERR "s3c24xx_serial: unknown pm %d\n", level);
}
}
static void
serial_s3c2410_set_termios(struct uart_port *port, struct termios *termios,
struct termios *old)
/* baud rate calculation
*
* The UARTs on the S3C2410/S3C2440 can take their clocks from a number
* of different sources, including the peripheral clock ("pclk") and an
* external clock ("uclk"). The S3C2440 also adds the core clock ("fclk")
* with a programmable extra divisor.
*
* The following code goes through the clock sources, and calculates the
* baud clocks (and the resultant actual baud rates) and then tries to
* pick the closest one and select that.
*
* NOTES:
* 1) there is no current code to properly select/deselect FCLK on
* the s3c2440, so only specify FCLK or non-FCLK in the clock
* sources for the UART
*
*/
#define MAX_CLKS (8)
static struct s3c24xx_uart_clksrc tmp_clksrc = {
.name = "pclk",
.min_baud = 0,
.max_baud = 0,
.divisor = 1,
};
static inline int
s3c24xx_serial_getsource(struct uart_port *port, struct s3c24xx_uart_clksrc *c)
{
struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
return (info->get_clksrc)(port, c);
}
static inline int
s3c24xx_serial_setsource(struct uart_port *port, struct s3c24xx_uart_clksrc *c)
{
struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
return (info->set_clksrc)(port, c);
}
struct baud_calc {
struct s3c24xx_uart_clksrc *clksrc;
unsigned int calc;
unsigned int quot;
struct clk *src;
};
static int s3c24xx_serial_calcbaud(struct baud_calc *calc,
struct uart_port *port,
struct s3c24xx_uart_clksrc *clksrc,
unsigned int baud)
{
unsigned long rate;
calc->src = clk_get(port->dev, clksrc->name);
if (calc->src == NULL || IS_ERR(calc->src))
return 0;
rate = clk_get_rate(calc->src);
calc->clksrc = clksrc;
calc->quot = (rate + (8 * baud)) / (16 * baud);
calc->calc = (rate / (calc->quot * 16));
calc->quot--;
return 1;
}
static unsigned int s3c24xx_serial_getclk(struct uart_port *port,
struct s3c24xx_uart_clksrc **clksrc,
struct clk **clk,
unsigned int baud)
{
struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
struct s3c24xx_uart_clksrc *clkp;
struct baud_calc res[MAX_CLKS];
struct baud_calc *resptr, *best, *sptr;
int i;
clkp = cfg->clocks;
best = NULL;
if (cfg->clocks_size < 2) {
if (cfg->clocks_size == 0)
clkp = &tmp_clksrc;
s3c24xx_serial_calcbaud(res, port, clkp, baud);
best = res;
resptr = best + 1;
} else {
resptr = res;
for (i = 0; i < cfg->clocks_size; i++, clkp++) {
if (s3c24xx_serial_calcbaud(resptr, port, clkp, baud))
resptr++;
}
}
/* ok, we now need to select the best clock we found */
if (!best) {
unsigned int deviation = (1<<30)|((1<<30)-1);
int calc_deviation;
for (sptr = res; sptr < resptr; sptr++) {
printk(KERN_DEBUG
"found clk %p (%s) quot %d, calc %d\n",
sptr->clksrc, sptr->clksrc->name,
sptr->quot, sptr->calc);
calc_deviation = baud - sptr->calc;
if (calc_deviation < 0)
calc_deviation = -calc_deviation;
if (calc_deviation < deviation) {
best = sptr;
deviation = calc_deviation;
}
}
printk(KERN_DEBUG "best %p (deviation %d)\n", best, deviation);
}
printk(KERN_DEBUG "selected clock %p (%s) quot %d, calc %d\n",
best->clksrc, best->clksrc->name, best->quot, best->calc);
/* store results to pass back */
*clksrc = best->clksrc;
*clk = best->src;
return best->quot;
}
static void s3c24xx_serial_set_termios(struct uart_port *port,
struct termios *termios,
struct termios *old)
{
struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
struct s3c24xx_uart_port *ourport = to_ourport(port);
struct s3c24xx_uart_clksrc *clksrc;
struct clk *clk;
unsigned long flags;
unsigned int baud, quot;
unsigned int ulcon;
......@@ -309,16 +747,34 @@ serial_s3c2410_set_termios(struct uart_port *port, struct termios *termios,
termios->c_cflag &= ~(HUPCL | CRTSCTS | CMSPAR);
termios->c_cflag |= CLOCAL;
/*
* We don't support BREAK character recognition.
*/
termios->c_iflag &= ~(IGNBRK | BRKINT);
/*
* 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);
baud = uart_get_baud_rate(port, termios, old, 0, 115200*8);
if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
quot = port->custom_divisor;
else
quot = s3c24xx_serial_getclk(port, &clksrc, &clk, baud);
/* check to see if we need to change clock source */
if (ourport->clksrc != clksrc || ourport->baudclk != clk) {
s3c24xx_serial_setsource(port, clksrc);
if (ourport->baudclk != NULL && !IS_ERR(ourport->baudclk)) {
clk_disable(ourport->baudclk);
clk_unuse(ourport->baudclk);
ourport->baudclk = NULL;
}
clk_use(clk);
clk_enable(clk);
ourport->clksrc = clksrc;
ourport->baudclk = clk;
}
switch (termios->c_cflag & CSIZE) {
case CS5:
......@@ -340,6 +796,9 @@ serial_s3c2410_set_termios(struct uart_port *port, struct termios *termios,
break;
}
/* preserve original lcon IR settings */
ulcon |= (cfg->ulcon & S3C2410_LCON_IRM);
if (termios->c_cflag & CSTOPB)
ulcon |= S3C2410_LCON_STOPB;
......@@ -352,18 +811,12 @@ serial_s3c2410_set_termios(struct uart_port *port, struct termios *termios,
ulcon |= S3C2410_LCON_PNONE;
}
/*
if (port->fifosize)
enable_fifo()
*/
spin_lock_irqsave(&port->lock, flags);
dbg("setting ulcon to %08x\n", ulcon);
//dbg("<flushing output from serial>\n");
dbg("setting ulcon to %08x, brddiv to %d\n", ulcon, quot);
/* set the ulcon register */
wr_regl(port, S3C2410_ULCON, ulcon);
wr_regl(port, S3C2410_UBRDIV, quot);
dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n",
rd_regl(port, S3C2410_ULCON),
......@@ -400,113 +853,151 @@ serial_s3c2410_set_termios(struct uart_port *port, struct termios *termios,
spin_unlock_irqrestore(&port->lock, flags);
}
static const char *serial_s3c2410_type(struct uart_port *port)
static const char *s3c24xx_serial_type(struct uart_port *port)
{
return port->type == PORT_S3C2410 ? "S3C2410" : NULL;
switch (port->type) {
case PORT_S3C2410:
return "S3C2410";
case PORT_S3C2440:
return "S3C2440";
default:
return NULL;
}
}
#define MAP_SIZE (0x100)
static void
serial_s3c2410_release_port(struct uart_port *port)
static void s3c24xx_serial_release_port(struct uart_port *port)
{
release_mem_region(port->mapbase, MAP_SIZE);
}
static int
serial_s3c2410_request_port(struct uart_port *port)
static int s3c24xx_serial_request_port(struct uart_port *port)
{
return request_mem_region(port->mapbase, MAP_SIZE, serial_s3c2410_name)
!= NULL ? 0 : -EBUSY;
char *name = s3c24xx_serial_portname(port);
return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY;
}
static void
serial_s3c2410_config_port(struct uart_port *port, int flags)
static void s3c24xx_serial_config_port(struct uart_port *port, int flags)
{
struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
if (flags & UART_CONFIG_TYPE &&
serial_s3c2410_request_port(port) == 0)
port->type = PORT_S3C2410;
s3c24xx_serial_request_port(port) == 0)
port->type = info->type;
}
/*
* verify the new serial_struct (for TIOCSSERIAL).
*/
static int
serial_s3c2410_verify_port(struct uart_port *port, struct serial_struct *ser)
s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
{
int ret = 0;
struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
if (ser->type != PORT_UNKNOWN && ser->type != PORT_S3C2410)
ret = -EINVAL;
if (ser->type != PORT_UNKNOWN && ser->type != info->type)
return -EINVAL;
return ret;
return 0;
}
static struct uart_ops serial_s3c2410_ops = {
.tx_empty = serial_s3c2410_tx_empty,
.get_mctrl = serial_s3c2410_get_mctrl,
.set_mctrl = serial_s3c2410_set_mctrl,
.stop_tx = serial_s3c2410_stop_tx,
.start_tx = serial_s3c2410_start_tx,
.stop_rx = serial_s3c2410_stop_rx,
.enable_ms = serial_s3c2410_enable_ms,
.break_ctl = serial_s3c2410_break_ctl,
.startup = serial_s3c2410_startup,
.shutdown = serial_s3c2410_shutdown,
.set_termios = serial_s3c2410_set_termios,
.type = serial_s3c2410_type,
.release_port = serial_s3c2410_release_port,
.request_port = serial_s3c2410_request_port,
.config_port = serial_s3c2410_config_port,
.verify_port = serial_s3c2410_verify_port,
#ifdef CONFIG_SERIAL_S3C2410_CONSOLE
static struct console s3c24xx_serial_console;
#define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console
#else
#define S3C24XX_SERIAL_CONSOLE NULL
#endif
static struct uart_ops s3c24xx_serial_ops = {
.pm = s3c24xx_serial_pm,
.tx_empty = s3c24xx_serial_tx_empty,
.get_mctrl = s3c24xx_serial_get_mctrl,
.set_mctrl = s3c24xx_serial_set_mctrl,
.stop_tx = s3c24xx_serial_stop_tx,
.start_tx = s3c24xx_serial_start_tx,
.stop_rx = s3c24xx_serial_stop_rx,
.enable_ms = s3c24xx_serial_enable_ms,
.break_ctl = s3c24xx_serial_break_ctl,
.startup = s3c24xx_serial_startup,
.shutdown = s3c24xx_serial_shutdown,
.set_termios = s3c24xx_serial_set_termios,
.type = s3c24xx_serial_type,
.release_port = s3c24xx_serial_release_port,
.request_port = s3c24xx_serial_request_port,
.config_port = s3c24xx_serial_config_port,
.verify_port = s3c24xx_serial_verify_port,
};
static struct uart_driver s3c24xx_uart_drv = {
.owner = THIS_MODULE,
.dev_name = "s3c2410_serial",
.nr = 3,
.cons = S3C24XX_SERIAL_CONSOLE,
.driver_name = S3C24XX_SERIAL_NAME,
.devfs_name = S3C24XX_SERIAL_DEVFS,
.major = S3C24XX_SERIAL_MAJOR,
.minor = S3C24XX_SERIAL_MINOR,
};
static struct uart_port serial_s3c2410_ports[NR_PORTS] = {
{
.membase = 0,
.mapbase = 0,
.iotype = UPIO_MEM,
.irq = IRQ_S3CUART_RX0,
.uartclk = 0,
.fifosize = 16,
.ops = &serial_s3c2410_ops,
.flags = UPF_BOOT_AUTOCONF,
.line = 0,
static struct s3c24xx_uart_port s3c24xx_serial_ports[NR_PORTS] = {
[0] = {
.port = {
.lock = SPIN_LOCK_UNLOCKED,
.membase = 0,
.mapbase = 0,
.iotype = UPIO_MEM,
.irq = IRQ_S3CUART_RX0,
.uartclk = 0,
.fifosize = 16,
.ops = &s3c24xx_serial_ops,
.flags = UPF_BOOT_AUTOCONF,
.line = 0,
}
},
[1] = {
.port = {
.lock = SPIN_LOCK_UNLOCKED,
.membase = 0,
.mapbase = 0,
.iotype = UPIO_MEM,
.irq = IRQ_S3CUART_RX1,
.uartclk = 0,
.fifosize = 16,
.ops = &s3c24xx_serial_ops,
.flags = UPF_BOOT_AUTOCONF,
.line = 1,
}
},
{
.membase = 0,
.mapbase = 0,
.iotype = UPIO_MEM,
.irq = IRQ_S3CUART_RX1,
.uartclk = 0,
.fifosize = 16,
.ops = &serial_s3c2410_ops,
.flags = UPF_BOOT_AUTOCONF,
.line = 1,
}
#if NR_PORTS > 2
,
{
.membase = 0,
.mapbase = 0,
.iotype = UPIO_MEM,
.irq = IRQ_S3CUART_RX2,
.uartclk = 0,
.fifosize = 16,
.ops = &serial_s3c2410_ops,
.flags = UPF_BOOT_AUTOCONF,
.line = 2,
[2] = {
.port = {
.lock = SPIN_LOCK_UNLOCKED,
.membase = 0,
.mapbase = 0,
.iotype = UPIO_MEM,
.irq = IRQ_S3CUART_RX2,
.uartclk = 0,
.fifosize = 16,
.ops = &s3c24xx_serial_ops,
.flags = UPF_BOOT_AUTOCONF,
.line = 2,
}
}
#endif
};
static int
serial_s3c2410_resetport(struct uart_port *port,
struct s3c2410_uartcfg *cfg)
static int s3c24xx_serial_resetport(struct uart_port *port,
struct s3c2410_uartcfg *cfg)
{
/* ensure registers are setup */
dbg("serial_s3c2410_resetport: port=%p (%08x), cfg=%p\n",
dbg("s3c24xx_serial_resetport: port=%p (%08lx), cfg=%p\n",
port, port->mapbase, cfg);
wr_regl(port, S3C2410_UCON, cfg->ucon);
......@@ -520,105 +1011,429 @@ serial_s3c2410_resetport(struct uart_port *port,
return 0;
}
/* serial_s3c2410_init_ports
/* s3c24xx_serial_init_port
*
* initialise the serial ports from the machine provided initialisation
* data.
*/
* initialise a single serial port from the platform device given
*/
static int serial_s3c2410_init_ports(void)
static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
struct s3c24xx_uart_info *info,
struct platform_device *platdev)
{
struct uart_port *ptr = serial_s3c2410_ports;
struct s3c2410_uartcfg *cfg = s3c2410_uartcfgs;
static int inited = 0;
int i;
struct uart_port *port = &ourport->port;
struct s3c2410_uartcfg *cfg;
struct resource *res;
dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev);
if (inited)
if (platdev == NULL)
return -ENODEV;
cfg = s3c24xx_dev_to_cfg(&platdev->dev);
if (port->mapbase != 0)
return 0;
inited = 1;
dbg("serial_s3c2410_init_ports: initialising ports...\n");
if (cfg->hwport > 3)
return -EINVAL;
for (i = 0; i < NR_PORTS; i++, ptr++, cfg++) {
/* setup info for port */
port->dev = &platdev->dev;
ourport->info = info;
if (cfg->hwport > 3)
continue;
/* copy the info in from provided structure */
ourport->port.fifosize = info->fifosize;
dbg("serial_s3c2410_init_ports: port %d (hw %d)...\n",
i, cfg->hwport);
dbg("s3c24xx_serial_init_port: %p (hw %d)...\n", port, cfg->hwport);
if (cfg->clock != NULL)
ptr->uartclk = *cfg->clock;
port->uartclk = 1;
switch (cfg->hwport) {
case 0:
ptr->mapbase = S3C2410_PA_UART0;
ptr->membase = (char *)S3C2410_VA_UART0;
ptr->irq = IRQ_S3CUART_RX0;
break;
if (cfg->uart_flags & UPF_CONS_FLOW) {
dbg("s3c24xx_serial_init_port: enabling flow control\n");
port->flags |= UPF_CONS_FLOW;
}
case 1:
ptr->mapbase = S3C2410_PA_UART1;
ptr->membase = (char *)S3C2410_VA_UART1;
ptr->irq = IRQ_S3CUART_RX1;
break;
/* sort our the physical and virtual addresses for each UART */
case 2:
ptr->mapbase = S3C2410_PA_UART2;
ptr->membase = (char *)S3C2410_VA_UART2;
ptr->irq = IRQ_S3CUART_RX2;
break;
}
res = platform_get_resource(platdev, IORESOURCE_MEM, 0);
if (res == NULL) {
printk(KERN_ERR "failed to find memory resource for uart\n");
return -EINVAL;
}
dbg("resource %p (%lx..%lx)\n", res, res->start, res->end);
port->mapbase = res->start;
port->membase = (void __iomem *)(res->start - S3C2410_PA_UART);
port->membase += S3C2410_VA_UART;
port->irq = platform_get_irq(platdev, 0);
ourport->clk = clk_get(&platdev->dev, "uart");
if (ourport->clk != NULL && !IS_ERR(ourport->clk))
clk_use(ourport->clk);
dbg("port: map=%08x, mem=%08x, irq=%d, clock=%ld\n",
port->mapbase, port->membase, port->irq, port->uartclk);
/* reset the fifos (and setup the uart) */
s3c24xx_serial_resetport(port, cfg);
return 0;
}
/* Device driver serial port probe */
static int probe_index = 0;
int s3c24xx_serial_probe(struct device *_dev,
struct s3c24xx_uart_info *info)
{
struct s3c24xx_uart_port *ourport;
struct platform_device *dev = to_platform_device(_dev);
int ret;
dbg("s3c24xx_serial_probe(%p, %p) %d\n", _dev, info, probe_index);
ourport = &s3c24xx_serial_ports[probe_index];
probe_index++;
dbg("%s: initialising port %p...\n", __FUNCTION__, ourport);
ret = s3c24xx_serial_init_port(ourport, info, dev);
if (ret < 0)
goto probe_err;
dbg("%s: adding port\n", __FUNCTION__);
uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
dev_set_drvdata(_dev, &ourport->port);
return 0;
probe_err:
return ret;
}
int s3c24xx_serial_remove(struct device *_dev)
{
struct uart_port *port = s3c24xx_dev_to_port(_dev);
if (port)
uart_remove_one_port(&s3c24xx_uart_drv, port);
return 0;
}
/* UART power management code */
#ifdef CONFIG_PM
int s3c24xx_serial_suspend(struct device *dev, u32 state, u32 level)
{
struct uart_port *port = s3c24xx_dev_to_port(dev);
if (port && level == SUSPEND_DISABLE)
uart_suspend_port(&s3c24xx_uart_drv, port);
return 0;
}
int s3c24xx_serial_resume(struct device *dev, u32 level)
{
struct uart_port *port = s3c24xx_dev_to_port(dev);
struct s3c24xx_uart_port *ourport = to_ourport(port);
if (port && level == RESUME_ENABLE) {
clk_enable(ourport->clk);
s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
clk_disable(ourport->clk);
uart_resume_port(&s3c24xx_uart_drv, port);
}
return 0;
}
#else
#define s3c24xx_serial_suspend NULL
#define s3c24xx_serial_resume NULL
#endif
int s3c24xx_serial_init(struct device_driver *drv,
struct s3c24xx_uart_info *info)
{
dbg("s3c24xx_serial_init(%p,%p)\n", drv, info);
return driver_register(drv);
}
/* now comes the code to initialise either the s3c2410 or s3c2440 serial
* port information
*/
/* cpu specific variations on the serial port support */
#ifdef CONFIG_CPU_S3C2410
static int s3c2410_serial_setsource(struct uart_port *port,
struct s3c24xx_uart_clksrc *clk)
{
unsigned long ucon = rd_regl(port, S3C2410_UCON);
if (strcmp(clk->name, "uclk") == 0)
ucon |= S3C2410_UCON_UCLK;
else
ucon &= ~S3C2410_UCON_UCLK;
wr_regl(port, S3C2410_UCON, ucon);
return 0;
}
static int s3c2410_serial_getsource(struct uart_port *port,
struct s3c24xx_uart_clksrc *clk)
{
unsigned long ucon = rd_regl(port, S3C2410_UCON);
clk->divisor = 1;
clk->name = (ucon & S3C2410_UCON_UCLK) ? "uclk" : "pclk";
return 0;
}
static struct s3c24xx_uart_info s3c2410_uart_inf = {
.name = "Samsung S3C2410 UART",
.type = PORT_S3C2410,
.fifosize = 16,
.rx_fifomask = S3C2410_UFSTAT_RXMASK,
.rx_fifoshift = S3C2410_UFSTAT_RXSHIFT,
.tx_fifofull = S3C2410_UFSTAT_TXFULL,
.tx_fifomask = S3C2410_UFSTAT_TXMASK,
.tx_fifoshift = S3C2410_UFSTAT_TXSHIFT,
.get_clksrc = s3c2410_serial_getsource,
.set_clksrc = s3c2410_serial_setsource,
};
/* device management */
static int s3c2410_serial_probe(struct device *dev)
{
return s3c24xx_serial_probe(dev, &s3c2410_uart_inf);
}
static struct device_driver s3c2410_serial_drv = {
.name = "s3c2410-uart",
.bus = &platform_bus_type,
.probe = s3c2410_serial_probe,
.remove = s3c24xx_serial_remove,
.suspend = s3c24xx_serial_suspend,
.resume = s3c24xx_serial_resume,
};
static inline int s3c2410_serial_init(void)
{
return s3c24xx_serial_init(&s3c2410_serial_drv, &s3c2410_uart_inf);
}
static inline void s3c2410_serial_exit(void)
{
driver_unregister(&s3c2410_serial_drv);
}
#define s3c2410_uart_inf_at &s3c2410_uart_inf
#else
static inline int s3c2410_serial_init(void)
{
return 0;
}
static inline void s3c2410_serial_exit(void)
{
}
#define s3c2410_uart_inf_at NULL
#endif /* CONFIG_CPU_S3C2410 */
#ifdef CONFIG_CPU_S3C2440
static int s3c2440_serial_setsource(struct uart_port *port,
struct s3c24xx_uart_clksrc *clk)
{
unsigned long ucon = rd_regl(port, S3C2410_UCON);
// todo - proper fclk<>nonfclk switch //
ucon &= ~S3C2440_UCON_CLKMASK;
if (strcmp(clk->name, "uclk") == 0)
ucon |= S3C2440_UCON_UCLK;
else if (strcmp(clk->name, "pclk") == 0)
ucon |= S3C2440_UCON_PCLK;
else if (strcmp(clk->name, "fclk") == 0)
ucon |= S3C2440_UCON_FCLK;
else {
printk(KERN_ERR "unknown clock source %s\n", clk->name);
return -EINVAL;
}
wr_regl(port, S3C2410_UCON, ucon);
return 0;
}
static int s3c2440_serial_getsource(struct uart_port *port,
struct s3c24xx_uart_clksrc *clk)
{
unsigned long ucon = rd_regl(port, S3C2410_UCON);
switch (ucon & S3C2440_UCON_CLKMASK) {
case S3C2440_UCON_UCLK:
clk->divisor = 1;
clk->name = "uclk";
break;
case S3C2440_UCON_PCLK:
case S3C2440_UCON_PCLK2:
clk->divisor = 1;
clk->name = "pclk";
break;
case S3C2440_UCON_FCLK:
clk->divisor = 7; /* todo - work out divisor */
clk->name = "fclk";
break;
}
return 0;
}
static struct s3c24xx_uart_info s3c2440_uart_inf = {
.name = "Samsung S3C2440 UART",
.type = PORT_S3C2440,
.fifosize = 64,
.rx_fifomask = S3C2440_UFSTAT_RXMASK,
.rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
.tx_fifofull = S3C2440_UFSTAT_TXFULL,
.tx_fifomask = S3C2440_UFSTAT_TXMASK,
.tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
.get_clksrc = s3c2440_serial_getsource,
.set_clksrc = s3c2440_serial_setsource
};
/* device management */
static int s3c2440_serial_probe(struct device *dev)
{
dbg("s3c2440_serial_probe: dev=%p\n", dev);
return s3c24xx_serial_probe(dev, &s3c2440_uart_inf);
}
static struct device_driver s3c2440_serial_drv = {
.name = "s3c2440-uart",
.bus = &platform_bus_type,
.probe = s3c2440_serial_probe,
.remove = s3c24xx_serial_remove,
.suspend = s3c24xx_serial_suspend,
.resume = s3c24xx_serial_resume,
};
static inline int s3c2440_serial_init(void)
{
return s3c24xx_serial_init(&s3c2440_serial_drv, &s3c2440_uart_inf);
}
static inline void s3c2440_serial_exit(void)
{
driver_unregister(&s3c2440_serial_drv);
}
#define s3c2440_uart_inf_at &s3c2440_uart_inf
#else
static inline int s3c2440_serial_init(void)
{
return 0;
}
static inline void s3c2440_serial_exit(void)
{
}
#define s3c2440_uart_inf_at NULL
#endif /* CONFIG_CPU_S3C2440 */
/* module initialisation code */
if (ptr->mapbase == 0)
continue;
static int __init s3c24xx_serial_modinit(void)
{
int ret;
/* reset the fifos (and setup the uart */
serial_s3c2410_resetport(ptr, cfg);
ret = uart_register_driver(&s3c24xx_uart_drv);
if (ret < 0) {
printk(KERN_ERR "failed to register UART driver\n");
return -1;
}
s3c2410_serial_init();
s3c2440_serial_init();
return 0;
}
static void __exit s3c24xx_serial_modexit(void)
{
s3c2410_serial_exit();
s3c2440_serial_exit();
uart_unregister_driver(&s3c24xx_uart_drv);
}
module_init(s3c24xx_serial_modinit);
module_exit(s3c24xx_serial_modexit);
/* Console code */
#ifdef CONFIG_SERIAL_S3C2410_CONSOLE
static struct uart_port *cons_uart;
static int
serial_s3c2410_console_txrdy(struct uart_port *port, unsigned int ufcon)
s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
{
struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
unsigned long ufstat, utrstat;
if (ufcon & S3C2410_UFCON_FIFOMODE) {
/* fifo mode - check ammount of data in fifo registers... */
ufstat = rd_regl(port, S3C2410_UFSTAT);
return S3C2410_UFCON_TXC(ufstat) < 12;
return (ufstat & info->tx_fifofull) ? 0 : 1;
}
/* in non-fifo mode, we go and use the tx buffer empty */
utrstat = rd_regl(port, S3C2410_UTRSTAT);
return (utrstat & S3C2410_UTRSTAT_TXFE) ? 1 : 0;
return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
}
static void
serial_s3c2410_console_write(struct console *co, const char *s,
s3c24xx_serial_console_write(struct console *co, const char *s,
unsigned int count)
{
int i;
unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON);
for (i = 0; i < count; i++) {
while (!serial_s3c2410_console_txrdy(cons_uart, ufcon))
while (!s3c24xx_serial_console_txrdy(cons_uart, ufcon))
barrier();
wr_regb(cons_uart, S3C2410_UTXH, s[i]);
if (s[i] == '\n') {
while (!serial_s3c2410_console_txrdy(cons_uart, ufcon))
while (!s3c24xx_serial_console_txrdy(cons_uart, ufcon))
barrier();
wr_regb(cons_uart, S3C2410_UTXH, '\r');
......@@ -627,17 +1442,21 @@ serial_s3c2410_console_write(struct console *co, const char *s,
}
static void __init
serial_s3c2410_get_options(struct uart_port *port, int *baud,
s3c24xx_serial_get_options(struct uart_port *port, int *baud,
int *parity, int *bits)
{
unsigned int ulcon, ucon, ubrdiv;
struct s3c24xx_uart_clksrc clksrc;
struct clk *clk;
unsigned int ulcon;
unsigned int ucon;
unsigned int ubrdiv;
unsigned long rate;
ulcon = rd_regl(port, S3C2410_ULCON);
ucon = rd_regl(port, S3C2410_UCON);
ubrdiv = rd_regl(port, S3C2410_UBRDIV);
dbg("serial_s3c2410_get_options: port=%p\n"
dbg("s3c24xx_serial_get_options: port=%p\n"
"registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n",
port, ulcon, ucon, ubrdiv);
......@@ -669,21 +1488,53 @@ serial_s3c2410_get_options(struct uart_port *port, int *baud,
*parity = 'o';
break;
default:
case S3C2410_LCON_PNONE:
default:
*parity = 'n';
}
/* now calculate the baud rate */
*baud = port->uartclk / ( 16 * (ubrdiv + 1));
s3c24xx_serial_getsource(port, &clksrc);
clk = clk_get(port->dev, clksrc.name);
if (!IS_ERR(clk) && clk != NULL)
rate = clk_get_rate(clk);
else
rate = 1;
*baud = rate / ( 16 * (ubrdiv + 1));
dbg("calculated baud %d\n", *baud);
}
}
/* s3c24xx_serial_init_ports
*
* initialise the serial ports from the machine provided initialisation
* data.
*/
static int s3c24xx_serial_init_ports(struct s3c24xx_uart_info *info)
{
struct s3c24xx_uart_port *ptr = s3c24xx_serial_ports;
struct platform_device **platdev_ptr;
int i;
dbg("s3c24xx_serial_init_ports: initialising ports...\n");
platdev_ptr = s3c24xx_uart_devs;
for (i = 0; i < NR_PORTS; i++, ptr++, platdev_ptr++) {
s3c24xx_serial_init_port(ptr, info, *platdev_ptr);
}
return 0;
}
static int __init
serial_s3c2410_console_setup(struct console *co, char *options)
s3c24xx_serial_console_setup(struct console *co, char *options)
{
struct uart_port *port;
int baud = 9600;
......@@ -691,23 +1542,26 @@ serial_s3c2410_console_setup(struct console *co, char *options)
int parity = 'n';
int flow = 'n';
dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n",
co, co->index, options);
/* is this a valid port */
if (co->index == -1 || co->index >= NR_PORTS)
co->index = 0;
port = &serial_s3c2410_ports[co->index];
port = &s3c24xx_serial_ports[co->index].port;
/* is the port configured? */
if (port->mapbase == 0x0) {
co->index = 0;
port = &serial_s3c2410_ports[co->index];
port = &s3c24xx_serial_ports[co->index].port;
}
cons_uart = port;
dbg("serial_s3c2410_console_setup: port=%p (%d)\n", port, co->index);
dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index);
/*
* Check whether an invalid uart number has been specified, and
......@@ -717,138 +1571,68 @@ serial_s3c2410_console_setup(struct console *co, char *options)
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
else
serial_s3c2410_get_options(port, &baud, &parity, &bits);
s3c24xx_serial_get_options(port, &baud, &parity, &bits);
dbg("s3c24xx_serial_console_setup: baud %d\n", baud);
return uart_set_options(port, co, baud, parity, bits, flow);
}
static struct uart_driver s3c2410_uart_drv;
/* s3c24xx_serial_initconsole
*
* initialise the console from one of the uart drivers
*/
static struct console serial_s3c2410_console =
static struct console s3c24xx_serial_console =
{
.name = SERIAL_S3C2410_NAME,
.write = serial_s3c2410_console_write,
.name = S3C24XX_SERIAL_NAME,
.device = uart_console_device,
.setup = serial_s3c2410_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &s3c2410_uart_drv,
};
static int __init s3c2410_console_init(void)
{
dbg("s3c2410_console_init:\n");
serial_s3c2410_init_ports();
register_console(&serial_s3c2410_console);
return 0;
}
console_initcall(s3c2410_console_init);
#define SERIAL_S3C2410_CONSOLE &serial_s3c2410_console
#else
#define SERIAL_S3C2410_CONSOLE NULL
#endif
static struct uart_driver s3c2410_uart_drv = {
.owner = THIS_MODULE,
.driver_name = SERIAL_S3C2410_NAME,
.dev_name = SERIAL_S3C2410_NAME,
.major = SERIAL_S3C2410_MAJOR,
.minor = SERIAL_S3C2410_MINOR,
.nr = 3,
.cons = SERIAL_S3C2410_CONSOLE,
};
/* device driver */
static int s3c2410_serial_probe(struct device *_dev);
static int s3c2410_serial_remove(struct device *_dev);
static struct device_driver s3c2410_serial_drv = {
.name = "s3c2410-uart",
.bus = &platform_bus_type,
.probe = s3c2410_serial_probe,
.remove = s3c2410_serial_remove,
.suspend = NULL,
.resume = NULL,
.write = s3c24xx_serial_console_write,
.setup = s3c24xx_serial_console_setup
};
#define s3c2410_dev_to_port(__dev) (struct uart_port *)dev_get_drvdata(__dev)
static int s3c2410_serial_probe(struct device *_dev)
static int s3c24xx_serial_initconsole(void)
{
struct platform_device *dev = to_platform_device(_dev);
struct resource *res = dev->resource;
int i;
struct s3c24xx_uart_info *info;
struct platform_device *dev = s3c24xx_uart_devs[0];
dbg("s3c2410_serial_probe: dev=%p, _dev=%p, res=%p\n", _dev, dev, res);
dbg("s3c24xx_serial_initconsole\n");
for (i = 0; i < dev->num_resources; i++, res++)
if (res->flags & IORESOURCE_MEM)
break;
if (i < dev->num_resources) {
struct uart_port *ptr = serial_s3c2410_ports;
/* select driver based on the cpu */
for (i = 0; i < NR_PORTS; i++, ptr++) {
dbg("s3c2410_serial_probe: ptr=%p (%08x, %08x)\n",
ptr, ptr->mapbase, ptr->membase);
if (ptr->mapbase != res->start)
continue;
dbg("s3c2410_serial_probe: got device %p: port=%p\n",
_dev, ptr);
uart_add_one_port(&s3c2410_uart_drv, ptr);
dev_set_drvdata(_dev, ptr);
break;
}
if (dev == NULL) {
printk(KERN_ERR "s3c24xx: no devices for console init\n");
return 0;
}
return 0;
}
if (strcmp(dev->name, "s3c2410-uart") == 0) {
info = s3c2410_uart_inf_at;
} else if (strcmp(dev->name, "s3c2440-uart") == 0) {
info = s3c2440_uart_inf_at;
} else {
printk(KERN_ERR "s3c24xx: no driver for %s\n", dev->name);
return 0;
}
static int s3c2410_serial_remove(struct device *_dev)
{
struct uart_port *port = s3c2410_dev_to_port(_dev);
if (info == NULL) {
printk(KERN_ERR "s3c24xx: no driver for console\n");
return 0;
}
if (port)
uart_remove_one_port(&s3c2410_uart_drv, port);
s3c24xx_serial_console.data = &s3c24xx_uart_drv;
s3c24xx_serial_init_ports(info);
register_console(&s3c24xx_serial_console);
return 0;
}
console_initcall(s3c24xx_serial_initconsole);
static int __init serial_s3c2410_init(void)
{
int ret;
printk(KERN_INFO "S3C2410X Serial, (c) 2003 Simtec Electronics\n");
ret = uart_register_driver(&s3c2410_uart_drv);
if (ret != 0)
return ret;
ret = driver_register(&s3c2410_serial_drv);
if (ret) {
uart_unregister_driver(&s3c2410_uart_drv);
}
return ret;
}
static void __exit serial_s3c2410_exit(void)
{
driver_unregister(&s3c2410_serial_drv);
uart_unregister_driver(&s3c2410_uart_drv);
}
module_init(serial_s3c2410_init);
module_exit(serial_s3c2410_exit);
#endif /* CONFIG_SERIAL_S3C2410_CONSOLE */
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
MODULE_DESCRIPTION("Samsung S3C2410X (S3C2410) Serial driver");
MODULE_DESCRIPTION("Samsung S3C2410/S3C2440 Serial port driver");
include/asm-arm/arch-s3c2410/regs-serial.h
View file @ 1a634bdd
......@@ -68,6 +68,12 @@
#define S3C2410_LCON_STOPB (1<<2)
#define S3C2410_LCON_IRM (1<<6)
#define S3C2440_UCON_CLKMASK (3<<10)
#define S3C2440_UCON_PCLK (0<<10)
#define S3C2440_UCON_UCLK (1<<10)
#define S3C2440_UCON_PCLK2 (2<<10)
#define S3C2440_UCON_FCLK (3<<10)
#define S3C2410_UCON_UCLK (1<<10)
#define S3C2410_UCON_SBREAK (1<<4)
......@@ -77,19 +83,35 @@
#define S3C2410_UCON_RXIRQMODE (1<<0)
#define S3C2410_UCON_RXFIFO_TOI (1<<7)
#define S3C2410_UCON_DEFAULT (S3C2410_UCON_TXILEVEL | S3C2410_UCON_RXILEVEL \
| S3C2410_UCON_TXIRQMODE | S3C2410_UCON_RXIRQMODE \
| S3C2410_UCON_RXFIFO_TOI)
#define S3C2410_UCON_DEFAULT (S3C2410_UCON_TXILEVEL | \
S3C2410_UCON_RXILEVEL | \
S3C2410_UCON_TXIRQMODE | \
S3C2410_UCON_RXIRQMODE | \
S3C2410_UCON_RXFIFO_TOI)
#define S3C2410_UFCON_FIFOMODE (1<<0)
#define S3C2410_UFCON_TXTRIG0 (0<<6)
#define S3C2410_UFCON_RXTRIG8 (1<<4)
#define S3C2410_UFCON_RXTRIG12 (2<<4)
/* S3C2440 FIFO trigger levels */
#define S3C2440_UFCON_RXTRIG1 (0<<4)
#define S3C2440_UFCON_RXTRIG8 (1<<4)
#define S3C2440_UFCON_RXTRIG16 (2<<4)
#define S3C2440_UFCON_RXTRIG32 (3<<4)
#define S3C2440_UFCON_TXTRIG0 (0<<6)
#define S3C2440_UFCON_TXTRIG16 (1<<6)
#define S3C2440_UFCON_TXTRIG32 (2<<6)
#define S3C2440_UFCON_TXTRIG48 (3<<6)
#define S3C2410_UFCON_RESETBOTH (3<<1)
#define S3C2410_UFCON_RESETTX (1<<2)
#define S3C2410_UFCON_RESETRX (1<<1)
#define S3C2410_UFCON_DEFAULT (S3C2410_UFCON_FIFOMODE | S3C2410_UFCON_TXTRIG0 \
| S3C2410_UFCON_RXTRIG8 )
#define S3C2410_UFCON_DEFAULT (S3C2410_UFCON_FIFOMODE | \
S3C2410_UFCON_TXTRIG0 | \
S3C2410_UFCON_RXTRIG8 )
#define S3C2410_UFSTAT_TXFULL (1<<9)
#define S3C2410_UFSTAT_RXFULL (1<<8)
......@@ -111,32 +133,36 @@
#define S3C2410_UERSTAT_OVERRUN (1<<0)
#define S3C2410_UERSTAT_FRAME (1<<2)
#define S3C2410_UERSTAT_ANY (S3C2410_UERSTAT_OVERRUN | S3C2410_UERSTAT_FRAME)
#define S3C2410_UERSTAT_BREAK (1<<3)
#define S3C2410_UERSTAT_ANY (S3C2410_UERSTAT_OVERRUN | \
S3C2410_UERSTAT_FRAME | \
S3C2410_UERSTAT_BREAK)
/* fifo size information */
#define S3C2410_UMSTAT_CTS (1<<0)
#define S3C2410_UMSTAT_DeltaCTS (1<<2)
#ifndef __ASSEMBLY__
static inline int S3C2410_UFCON_RXC(int fcon)
{
if (fcon & S3C2410_UFSTAT_RXFULL)
return 16;
return ((fcon) & S3C2410_UFSTAT_RXMASK) >> S3C2410_UFSTAT_RXSHIFT;
}
static inline int S3C2410_UFCON_TXC(int fcon)
{
if (fcon & S3C2410_UFSTAT_TXFULL)
return 16;
return ((fcon) & S3C2410_UFSTAT_TXMASK) >> S3C2410_UFSTAT_TXSHIFT;
}
#endif /* __ASSEMBLY__ */
/* struct s3c24xx_uart_clksrc
*
* this structure defines a named clock source that can be used for the
* uart, so that the best clock can be selected for the requested baud
* rate.
*
* min_baud and max_baud define the range of baud-rates this clock is
* acceptable for, if they are both zero, it is assumed any baud rate that
* can be generated from this clock will be used.
*
* divisor gives the divisor from the clock to the one seen by the uart
*/
#define S3C2410_UMSTAT_CTS (1<<0)
#define S3C2410_UMSTAT_DeltaCTS (1<<2)
struct s3c24xx_uart_clksrc {
const char *name;
unsigned int divisor;
unsigned int min_baud;
unsigned int max_baud;
};
#ifndef __ASSEMBLY__
/* configuration structure for per-machine configurations for the
* serial port
*
......@@ -148,15 +174,23 @@ struct s3c2410_uartcfg {
unsigned char hwport; /* hardware port number */
unsigned char unused;
unsigned short flags;
unsigned long *clock; /* pointer to clock rate */
unsigned long uart_flags; /* default uart flags */
unsigned long ucon; /* value of ucon for port */
unsigned long ulcon; /* value of ulcon for port */
unsigned long ufcon; /* value of ufcon for port */
struct s3c24xx_uart_clksrc *clocks;
unsigned int clocks_size;
};
extern struct s3c2410_uartcfg *s3c2410_uartcfgs;
/* s3c24xx_uart_devs
*
* this is exported from the core as we cannot use driver_register(),
* or platform_add_device() before the console_initcall()
*/
extern struct platform_device *s3c24xx_uart_devs[3];
#endif /* __ASSEMBLY__ */
......
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