/*
- * linux/drivers/serial/s3c2410.c
+ * linux/drivers/char/s3c2410.c
*
- * Driver for onboard UARTs on the Samsung S3C24XX
+ * Driver for onboard UARTs on the Samsung S3C2410
*
* Based on drivers/char/serial.c and drivers/char/21285.c
*
*
* 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 Pötzl)
- * - Break character handling (Herbert Pötzl)
- * - 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 rx_fifofull;
- 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
-#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)
-
+#include <asm/debug-ll.h>
+#define dbg(x...) llprintk(x)
#else
-#define dbg(x...) printk(KERN_DEBUG "s3c24xx: ");
+#define dbg(x...)
#endif
-#else /* no debug */
-#define dbg(x...) do {} while(0)
-#endif
-
-/* 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)
+#define SERIAL_S3C2410_NAME "ttySAC"
+#define SERIAL_S3C2410_MAJOR 204
+#define SERIAL_S3C2410_MINOR 64
/* 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)
-/* register access controls */
-
-#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)))
-
-#define wr_regb(port, reg, val) \
- do { __raw_writeb(val, portaddr(port, reg)); } while(0)
-
-#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);
+/* access functions */
- while (--count && !s3c24xx_serial_txempty_nofifo(port))
- udelay(100);
+#define portaddr(port, reg) ((void *)((port)->membase + (reg)))
- ufcon = rd_regl(port, S3C2410_UFCON);
- ufcon |= S3C2410_UFCON_RESETRX;
- wr_regl(port, S3C2410_UFCON, ufcon);
+#define rd_regb(port, reg) (__raw_readb(portaddr(port, reg)))
+#define rd_regl(port, reg) (__raw_readl(portaddr(port, reg)))
- ucon = rd_regl(port, S3C2410_UCON);
- ucon |= S3C2410_UCON_RXIRQMODE;
- wr_regl(port, S3C2410_UCON, ucon);
+#define wr_regb(port, reg, val) \
+ do { __raw_writeb(val, portaddr(port, reg)); } while(0)
- rx_enabled(port) = 1;
- spin_unlock_irqrestore(&port->lock, flags);
-}
+#define wr_regl(port, reg, val) \
+ do { __raw_writel(val, portaddr(port, reg)); } while(0)
-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);
- rx_enabled(port) = 0;
- spin_unlock_irqrestore(&port->lock, flags);
-}
+/* code */
static void
-s3c24xx_serial_stop_tx(struct uart_port *port, unsigned int tty_stop)
+serial_s3c2410_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
-s3c24xx_serial_start_tx(struct uart_port *port, unsigned int tty_start)
+serial_s3c2410_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 s3c24xx_serial_stop_rx(struct uart_port *port)
+static void serial_s3c2410_stop_rx(struct uart_port *port)
{
if (rx_enabled(port)) {
- dbg("s3c24xx_serial_stop_rx: port=%p\n", port);
+ dbg("serial_s3c2410_stop_rx: port=%p\n", port);
disable_irq(RX_IRQ(port));
rx_enabled(port) = 0;
}
}
-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)
+static void serial_s3c2410_enable_ms(struct uart_port *port)
{
- struct s3c24xx_uart_info *info = ourport->info;
-
- if (ufstat & info->rx_fifofull)
- return info->fifosize;
-
- return (ufstat & info->rx_fifomask) >> info->rx_fifoshift;
}
-
/* ? - where has parity gone?? */
#define S3C2410_UERSTAT_PARITY (0x1000)
static irqreturn_t
-s3c24xx_serial_rx_chars(int irq, void *dev_id, struct pt_regs *regs)
+serial_s3c2410_rx_chars(int irq, void *dev_id, struct pt_regs *regs)
{
- struct s3c24xx_uart_port *ourport = dev_id;
- struct uart_port *port = &ourport->port;
+ struct uart_port *port = dev_id;
struct tty_struct *tty = port->info->tty;
- unsigned int ufcon, ch, flag, ufstat, uerstat;
- int max_count = 64;
+ unsigned int ufcon, ch, rxs, ufstat;
+ int max_count = 256;
while (max_count-- > 0) {
ufcon = rd_regl(port, S3C2410_UFCON);
ufstat = rd_regl(port, S3C2410_UFSTAT);
- if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
+ if (S3C2410_UFCON_RXC(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;
+ tty->flip.work.func((void *)tty);
+ if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
+ printk(KERN_WARNING "TTY_DONT_FLIP set\n");
+ goto out;
}
}
- /* insert the character into the buffer */
+ ch = rd_regb(port, S3C2410_URXH);
- flag = TTY_NORMAL;
+ *tty->flip.char_buf_ptr = ch;
+ *tty->flip.flag_buf_ptr = TTY_NORMAL;
port->icount.rx++;
- 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;
- }
+ rxs = rd_regb(port, S3C2410_UERSTAT) | RXSTAT_DUMMY_READ;
- if (uerstat & S3C2410_UERSTAT_FRAME)
+ if (rxs & S3C2410_UERSTAT_ANY) {
+ if (rxs & S3C2410_UERSTAT_FRAME)
port->icount.frame++;
- if (uerstat & S3C2410_UERSTAT_OVERRUN)
+ if (rxs & S3C2410_UERSTAT_OVERRUN)
port->icount.overrun++;
- uerstat &= port->read_status_mask;
+ rxs &= port->read_status_mask;
- if (uerstat & S3C2410_UERSTAT_BREAK)
- flag = TTY_BREAK;
- else if (uerstat & S3C2410_UERSTAT_PARITY)
- flag = TTY_PARITY;
- else if (uerstat & ( S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_OVERRUN))
- flag = TTY_FRAME;
+ if (rxs & S3C2410_UERSTAT_PARITY)
+ *tty->flip.flag_buf_ptr = TTY_PARITY;
+ else if (rxs & ( S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_OVERRUN))
+ *tty->flip.flag_buf_ptr = TTY_FRAME;
}
- 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 & port->ignore_status_mask) == 0) {
+ tty->flip.flag_buf_ptr++;
+ tty->flip.char_buf_ptr++;
+ tty->flip.count++;
}
- if ((uerstat & S3C2410_UERSTAT_OVERRUN) &&
+ if ((rxs & 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);
+ *tty->flip.char_buf_ptr++ = 0;
+ *tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
+ tty->flip.count++;
}
-
- ignore_char:
- continue;
}
tty_flip_buffer_push(tty);
return IRQ_HANDLED;
}
-static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id, struct pt_regs *regs)
+static irqreturn_t
+serial_s3c2410_tx_chars(int irq, void *dev_id, struct pt_regs *regs)
{
- struct s3c24xx_uart_port *ourport = id;
- struct uart_port *port = &ourport->port;
+ struct uart_port *port = (struct uart_port *)dev_id;
struct circ_buf *xmit = &port->info->xmit;
int count = 256;
*/
if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
- s3c24xx_serial_stop_tx(port, 0);
+ serial_s3c2410_stop_tx(port, 0);
goto out;
}
/* try and drain the buffer... */
while (!uart_circ_empty(xmit) && count-- > 0) {
- if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
+ if (rd_regl(port, S3C2410_UFSTAT) & S3C2410_UFSTAT_TXFULL)
break;
wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
uart_write_wakeup(port);
if (uart_circ_empty(xmit))
- s3c24xx_serial_stop_tx(port, 0);
+ serial_s3c2410_stop_tx(port, 0);
out:
return IRQ_HANDLED;
}
-static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
+static unsigned int
+serial_s3c2410_tx_empty(struct uart_port *port)
{
- 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);
+ unsigned int ufcon = rd_regl(port, S3C2410_UFCON);
+ return (S3C2410_UFCON_TXC(ufcon) != 0) ? 0 : TIOCSER_TEMT;
}
/* no modem control lines */
-static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
+static unsigned int
+serial_s3c2410_get_mctrl(struct uart_port *port)
{
unsigned int umstat = rd_regb(port,S3C2410_UMSTAT);
return TIOCM_CAR | TIOCM_DSR;
}
-static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
+static void
+serial_s3c2410_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
/* todo - possibly remove AFC and do manual CTS */
}
-static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state)
+static void serial_s3c2410_break_ctl(struct uart_port *port, int break_state)
{
unsigned long flags;
unsigned int ucon;
spin_unlock_irqrestore(&port->lock, flags);
}
-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)
+static int serial_s3c2410_startup(struct uart_port *port)
{
- struct s3c24xx_uart_port *ourport = to_ourport(port);
- unsigned long flags;
int ret;
- dbg("s3c24xx_serial_startup: port=%p (%08lx,%p)\n",
- port->mapbase, port->membase);
-
- local_irq_save(flags);
-
+ tx_enabled(port) = 1;
rx_enabled(port) = 1;
- ret = request_irq(RX_IRQ(port),
- s3c24xx_serial_rx_chars, 0,
- s3c24xx_serial_portname(port), ourport);
-
- if (ret != 0) {
- printk(KERN_ERR "cannot get irq %d\n", RX_IRQ(port));
- return ret;
- }
-
- ourport->rx_claimed = 1;
+ dbg("serial_s3c2410_startup: port=%p (%p)\n",
+ port, port->mapbase);
- dbg("requesting tx irq...\n");
+ ret = request_irq(RX_IRQ(port), serial_s3c2410_rx_chars, 0,
+ serial_s3c2410_name, port);
- tx_enabled(port) = 1;
+ if (ret != 0)
+ return ret;
- ret = request_irq(TX_IRQ(port),
- s3c24xx_serial_tx_chars, 0,
- s3c24xx_serial_portname(port), ourport);
+ ret = request_irq(TX_IRQ(port), serial_s3c2410_tx_chars, 0,
+ serial_s3c2410_name, port);
if (ret) {
- printk(KERN_ERR "cannot get irq %d\n", TX_IRQ(port));
- goto err;
+ free_irq(RX_IRQ(port), port);
+ return ret;
}
- 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;
}
-/* power power management control */
-
-static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
- unsigned int old)
-{
- 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);
- }
-}
-
-/* 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)
+static void serial_s3c2410_shutdown(struct uart_port *port)
{
- 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;
+ free_irq(TX_IRQ(port), port);
+ free_irq(RX_IRQ(port), port);
}
-static void s3c24xx_serial_set_termios(struct uart_port *port,
- struct termios *termios,
- struct termios *old)
+static void
+serial_s3c2410_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;
termios->c_cflag |= CLOCAL;
/*
- * Ask the core to calculate the divisor for us.
+ * We don't support BREAK character recognition.
*/
+ termios->c_iflag &= ~(IGNBRK | BRKINT);
- 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;
- }
+ /*
+ * 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:
break;
}
- /* preserve original lcon IR settings */
- ulcon |= (cfg->ulcon & S3C2410_LCON_IRM);
-
if (termios->c_cflag & CSTOPB)
ulcon |= S3C2410_LCON_STOPB;
ulcon |= S3C2410_LCON_PNONE;
}
+ /*
+ if (port->fifosize)
+ enable_fifo()
+ */
+
spin_lock_irqsave(&port->lock, flags);
- dbg("setting ulcon to %08x, brddiv to %d\n", ulcon, quot);
+ dbg("setting ulcon to %08x\n", ulcon);
+ //dbg("<flushing output from serial>\n");
+ /* 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),
spin_unlock_irqrestore(&port->lock, flags);
}
-static const char *s3c24xx_serial_type(struct uart_port *port)
+static const char *serial_s3c2410_type(struct uart_port *port)
{
- switch (port->type) {
- case PORT_S3C2410:
- return "S3C2410";
- case PORT_S3C2440:
- return "S3C2440";
- default:
- return NULL;
- }
+ return port->type == PORT_S3C2410 ? "S3C2410" : NULL;
}
#define MAP_SIZE (0x100)
-static void s3c24xx_serial_release_port(struct uart_port *port)
+static void
+serial_s3c2410_release_port(struct uart_port *port)
{
release_mem_region(port->mapbase, MAP_SIZE);
}
-static int s3c24xx_serial_request_port(struct uart_port *port)
+static int
+serial_s3c2410_request_port(struct uart_port *port)
{
- char *name = s3c24xx_serial_portname(port);
- return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY;
+ return request_mem_region(port->mapbase, MAP_SIZE, serial_s3c2410_name)
+ != NULL ? 0 : -EBUSY;
}
-static void s3c24xx_serial_config_port(struct uart_port *port, int flags)
+static void
+serial_s3c2410_config_port(struct uart_port *port, int flags)
{
- struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
-
if (flags & UART_CONFIG_TYPE &&
- s3c24xx_serial_request_port(port) == 0)
- port->type = info->type;
+ serial_s3c2410_request_port(port) == 0)
+ port->type = PORT_S3C2410;
}
/*
* verify the new serial_struct (for TIOCSSERIAL).
*/
static int
-s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
+serial_s3c2410_verify_port(struct uart_port *port, struct serial_struct *ser)
{
- struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
+ int ret = 0;
- if (ser->type != PORT_UNKNOWN && ser->type != info->type)
- return -EINVAL;
+ if (ser->type != PORT_UNKNOWN && ser->type != PORT_S3C2410)
+ ret = -EINVAL;
- return 0;
+ return ret;
}
-
-#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_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,
};
-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,
- }
+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,
},
+ {
+ .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
-
- [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,
- }
+ ,
+ {
+ .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,
}
#endif
};
-
-static int s3c24xx_serial_resetport(struct uart_port *port,
- struct s3c2410_uartcfg *cfg)
+static int
+serial_s3c2410_resetport(struct uart_port *port,
+ struct s3c2410_uartcfg *cfg)
{
/* ensure registers are setup */
- dbg("s3c24xx_serial_resetport: port=%p (%08lx), cfg=%p\n",
+ dbg("serial_s3c2410_resetport: port=%p (%08x), cfg=%p\n",
port, port->mapbase, cfg);
wr_regl(port, S3C2410_UCON, cfg->ucon);
return 0;
}
-/* s3c24xx_serial_init_port
+/* serial_s3c2410_init_ports
*
- * initialise a single serial port from the platform device given
- */
-
-static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
- struct s3c24xx_uart_info *info,
- struct platform_device *platdev)
-{
- 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 (platdev == NULL)
- return -ENODEV;
-
- cfg = s3c24xx_dev_to_cfg(&platdev->dev);
-
- if (port->mapbase != 0)
- return 0;
-
- if (cfg->hwport > 3)
- return -EINVAL;
-
- /* setup info for port */
- port->dev = &platdev->dev;
- ourport->info = info;
-
- /* copy the info in from provided structure */
- ourport->port.fifosize = info->fifosize;
-
- dbg("s3c24xx_serial_init_port: %p (hw %d)...\n", port, cfg->hwport);
-
- port->uartclk = 1;
-
- if (cfg->uart_flags & UPF_CONS_FLOW) {
- dbg("s3c24xx_serial_init_port: enabling flow control\n");
- port->flags |= UPF_CONS_FLOW;
- }
-
- /* sort our the physical and virtual addresses for each UART */
-
- 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
+ * initialise the serial ports from the machine provided initialisation
+ * data.
*/
-/* 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,
- .rx_fifofull = S3C2410_UFSTAT_RXFULL,
- .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)
+static int serial_s3c2410_init_ports(void)
{
- 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,
- .rx_fifofull = S3C2440_UFSTAT_RXFULL,
- .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);
-}
+ struct uart_port *ptr = serial_s3c2410_ports;
+ struct s3c2410_uartcfg *cfg = s3c2410_uartcfgs;
+ static int inited = 0;
+ int i;
-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,
-};
+ if (inited)
+ return 0;
+ inited = 1;
+ dbg("serial_s3c2410_init_ports: initialising ports...\n");
-static inline int s3c2440_serial_init(void)
-{
- return s3c24xx_serial_init(&s3c2440_serial_drv, &s3c2440_uart_inf);
-}
+ for (i = 0; i < NR_PORTS; i++, ptr++, cfg++) {
-static inline void s3c2440_serial_exit(void)
-{
- driver_unregister(&s3c2440_serial_drv);
-}
+ if (cfg->hwport > 3)
+ continue;
-#define s3c2440_uart_inf_at &s3c2440_uart_inf
-#else
+ dbg("serial_s3c2410_init_ports: port %d (hw %d)...\n",
+ i, cfg->hwport);
-static inline int s3c2440_serial_init(void)
-{
- return 0;
-}
+ if (cfg->clock != NULL)
+ ptr->uartclk = *cfg->clock;
-static inline void s3c2440_serial_exit(void)
-{
-}
+ switch (cfg->hwport) {
+ case 0:
+ ptr->mapbase = S3C2410_PA_UART0;
+ ptr->membase = (char *)S3C2410_VA_UART0;
+ ptr->irq = IRQ_S3CUART_RX0;
+ break;
-#define s3c2440_uart_inf_at NULL
-#endif /* CONFIG_CPU_S3C2440 */
+ case 1:
+ ptr->mapbase = S3C2410_PA_UART1;
+ ptr->membase = (char *)S3C2410_VA_UART1;
+ ptr->irq = IRQ_S3CUART_RX1;
+ break;
-/* module initialisation code */
+ case 2:
+ ptr->mapbase = S3C2410_PA_UART2;
+ ptr->membase = (char *)S3C2410_VA_UART2;
+ ptr->irq = IRQ_S3CUART_RX2;
+ break;
+ }
-static int __init s3c24xx_serial_modinit(void)
-{
- int ret;
+ if (ptr->mapbase == 0)
+ continue;
- ret = uart_register_driver(&s3c24xx_uart_drv);
- if (ret < 0) {
- printk(KERN_ERR "failed to register UART driver\n");
- return -1;
+ /* reset the fifos (and setup the uart */
+ serial_s3c2410_resetport(ptr, cfg);
}
- 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
-s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
+serial_s3c2410_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 (ufstat & info->tx_fifofull) ? 0 : 1;
+
+ return S3C2410_UFCON_TXC(ufstat) < 12;
}
/* in non-fifo mode, we go and use the tx buffer empty */
utrstat = rd_regl(port, S3C2410_UTRSTAT);
- return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
+
+ return (utrstat & S3C2410_UTRSTAT_TXFE) ? 1 : 0;
}
static void
-s3c24xx_serial_console_write(struct console *co, const char *s,
+serial_s3c2410_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 (!s3c24xx_serial_console_txrdy(cons_uart, ufcon))
+ while (!serial_s3c2410_console_txrdy(cons_uart, ufcon))
barrier();
wr_regb(cons_uart, S3C2410_UTXH, s[i]);
if (s[i] == '\n') {
- while (!s3c24xx_serial_console_txrdy(cons_uart, ufcon))
+ while (!serial_s3c2410_console_txrdy(cons_uart, ufcon))
barrier();
wr_regb(cons_uart, S3C2410_UTXH, '\r');
}
static void __init
-s3c24xx_serial_get_options(struct uart_port *port, int *baud,
+serial_s3c2410_get_options(struct uart_port *port, int *baud,
int *parity, int *bits)
{
- struct s3c24xx_uart_clksrc clksrc;
- struct clk *clk;
- unsigned int ulcon;
- unsigned int ucon;
- unsigned int ubrdiv;
- unsigned long rate;
+
+ unsigned int ulcon, ucon, ubrdiv;
ulcon = rd_regl(port, S3C2410_ULCON);
ucon = rd_regl(port, S3C2410_UCON);
ubrdiv = rd_regl(port, S3C2410_UBRDIV);
- dbg("s3c24xx_serial_get_options: port=%p\n"
+ dbg("serial_s3c2410_get_options: port=%p\n"
"registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n",
port, ulcon, ucon, ubrdiv);
*parity = 'o';
break;
- case S3C2410_LCON_PNONE:
default:
+ case S3C2410_LCON_PNONE:
*parity = 'n';
}
/* now calculate the baud rate */
- 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));
+ *baud = port->uartclk / ( 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
-s3c24xx_serial_console_setup(struct console *co, char *options)
+serial_s3c2410_console_setup(struct console *co, char *options)
{
struct uart_port *port;
int baud = 9600;
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 = &s3c24xx_serial_ports[co->index].port;
+ port = &serial_s3c2410_ports[co->index];
/* is the port configured? */
if (port->mapbase == 0x0) {
co->index = 0;
- port = &s3c24xx_serial_ports[co->index].port;
+ port = &serial_s3c2410_ports[co->index];
}
cons_uart = port;
- dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index);
+ dbg("serial_s3c2410_console_setup: port=%p (%d)\n", port, co->index);
/*
* Check whether an invalid uart number has been specified, and
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
else
- s3c24xx_serial_get_options(port, &baud, &parity, &bits);
-
- dbg("s3c24xx_serial_console_setup: baud %d\n", baud);
+ serial_s3c2410_get_options(port, &baud, &parity, &bits);
return uart_set_options(port, co, baud, parity, bits, flow);
}
-/* s3c24xx_serial_initconsole
- *
- * initialise the console from one of the uart drivers
-*/
+static struct uart_driver s3c2410_uart_drv;
-static struct console s3c24xx_serial_console =
+static struct console serial_s3c2410_console =
{
- .name = S3C24XX_SERIAL_NAME,
+ .name = SERIAL_S3C2410_NAME,
+ .write = serial_s3c2410_console_write,
.device = uart_console_device,
+ .setup = serial_s3c2410_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
- .write = s3c24xx_serial_console_write,
- .setup = s3c24xx_serial_console_setup
+ .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 int s3c24xx_serial_initconsole(void)
+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,
+};
+
+#define s3c2410_dev_to_port(__dev) (struct uart_port *)dev_get_drvdata(__dev)
+
+static int s3c2410_serial_probe(struct device *_dev)
{
- struct s3c24xx_uart_info *info;
- struct platform_device *dev = s3c24xx_uart_devs[0];
+ struct platform_device *dev = to_platform_device(_dev);
+ struct resource *res = dev->resource;
+ int i;
- dbg("s3c24xx_serial_initconsole\n");
+ dbg("s3c2410_serial_probe: dev=%p, _dev=%p, res=%p\n", _dev, dev, res);
- /* select driver based on the cpu */
+ for (i = 0; i < dev->num_resources; i++, res++)
+ if (res->flags & IORESOURCE_MEM)
+ break;
- if (dev == NULL) {
- printk(KERN_ERR "s3c24xx: no devices for console init\n");
- return 0;
- }
+ if (i < dev->num_resources) {
+ struct uart_port *ptr = serial_s3c2410_ports;
- 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;
- }
+ for (i = 0; i < NR_PORTS; i++, ptr++) {
+ dbg("s3c2410_serial_probe: ptr=%p (%08x, %08x)\n",
+ ptr, ptr->mapbase, ptr->membase);
- if (info == NULL) {
- printk(KERN_ERR "s3c24xx: no driver for console\n");
- return 0;
+ 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;
+ }
}
- s3c24xx_serial_console.data = &s3c24xx_uart_drv;
- s3c24xx_serial_init_ports(info);
+ return 0;
+}
+
+static int s3c2410_serial_remove(struct device *_dev)
+{
+ struct uart_port *port = s3c2410_dev_to_port(_dev);
+
+ if (port)
+ uart_remove_one_port(&s3c2410_uart_drv, port);
- register_console(&s3c24xx_serial_console);
return 0;
}
-console_initcall(s3c24xx_serial_initconsole);
-#endif /* CONFIG_SERIAL_S3C2410_CONSOLE */
+
+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);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
-MODULE_DESCRIPTION("Samsung S3C2410/S3C2440 Serial port driver");
+MODULE_DESCRIPTION("Samsung S3C2410X (S3C2410) Serial driver");
git://git.onelab.eu / linux-2.6.git / blobdiff