/*
- * 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
*
*
* 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
-#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
+
+/* 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
+
-#define SERIAL_S3C2410_NAME "ttySAC"
-#define SERIAL_S3C2410_MAJOR 204
-#define SERIAL_S3C2410_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)
-
-/* access functions */
+/* register access controls */
-#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)))
#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;
+
+ 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
-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, 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) {
- tty->flip.work.func((void *)tty);
- if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
- printk(KERN_WARNING "TTY_DONT_FLIP set\n");
- goto out;
- }
+ 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);
- *tty->flip.char_buf_ptr = ch;
- *tty->flip.flag_buf_ptr = TTY_NORMAL;
+ 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)
- *tty->flip.flag_buf_ptr = TTY_PARITY;
- else if (rxs & ( S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_OVERRUN))
- *tty->flip.flag_buf_ptr = TTY_FRAME;
+ 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 & port->ignore_status_mask) == 0) {
- tty->flip.flag_buf_ptr++;
- tty->flip.char_buf_ptr++;
- tty->flip.count++;
+ 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->flip.char_buf_ptr++ = 0;
- *tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
- tty->flip.count++;
+
+ tty_insert_flip_char(tty, 0, TTY_OVERRUN);
}
+
+ ignore_char:
+ continue;
}
tty_flip_buffer_push(tty);
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;
*/
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]);
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);
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;
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);
- dbg("serial_s3c2410_startup: port=%p (%p)\n",
- port, port->mapbase);
+ local_irq_save(flags);
- ret = request_irq(RX_IRQ(port), serial_s3c2410_rx_chars, 0,
- serial_s3c2410_name, port);
+ rx_enabled(port) = 1;
+
+ 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;
- ret = request_irq(TX_IRQ(port), serial_s3c2410_tx_chars, 0,
- serial_s3c2410_name, port);
+ dbg("requesting tx irq...\n");
+
+ tx_enabled(port) = 1;
+
+ 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;
+ unsigned int umcon;
/*
* We don't support modem control lines.
*/
- termios->c_cflag &= ~(HUPCL | CRTSCTS | CMSPAR);
+ termios->c_cflag &= ~(HUPCL | 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:
break;
}
+ /* preserve original lcon IR settings */
+ ulcon |= (cfg->ulcon & S3C2410_LCON_IRM);
+
if (termios->c_cflag & CSTOPB)
ulcon |= S3C2410_LCON_STOPB;
+ umcon = (termios->c_cflag & CRTSCTS) ? S3C2410_UMCOM_AFC : 0;
+
if (termios->c_cflag & PARENB) {
- if (!(termios->c_cflag & PARODD))
+ if (termios->c_cflag & PARODD)
ulcon |= S3C2410_LCON_PODD;
else
ulcon |= S3C2410_LCON_PEVEN;
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);
+ wr_regl(port, S3C2410_UMCON, umcon);
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 *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_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 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 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);
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,
+ .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)
+{
+ unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+ switch (ucon & S3C2440_UCON_CLKMASK) {
+ case S3C2440_UCON_UCLK:
+ clk->divisor = 1;
+ clk->name = "uclk";
+ break;
- if (ptr->mapbase == 0)
- continue;
+ 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);
+}
+
+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)
+{
+}
- /* reset the fifos (and setup the uart */
- serial_s3c2410_resetport(ptr, cfg);
+#define s3c2440_uart_inf_at NULL
+#endif /* CONFIG_CPU_S3C2440 */
+
+/* module initialisation code */
+
+static int __init s3c24xx_serial_modinit(void)
+{
+ int ret;
+
+ 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');
}
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);
*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;
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
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,
+ .write = s3c24xx_serial_console_write,
+ .setup = s3c24xx_serial_console_setup
};
-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,
-};
-
-#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;
-
- dbg("s3c2410_serial_probe: dev=%p, _dev=%p, res=%p\n", _dev, dev, res);
-
- for (i = 0; i < dev->num_resources; i++, res++)
- if (res->flags & IORESOURCE_MEM)
- break;
+ struct s3c24xx_uart_info *info;
+ struct platform_device *dev = s3c24xx_uart_devs[0];
- if (i < dev->num_resources) {
- struct uart_port *ptr = serial_s3c2410_ports;
+ dbg("s3c24xx_serial_initconsole\n");
- for (i = 0; i < NR_PORTS; i++, ptr++) {
- dbg("s3c2410_serial_probe: ptr=%p (%08x, %08x)\n",
- ptr, ptr->mapbase, ptr->membase);
+ /* select driver based on the cpu */
- 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");
git://git.onelab.eu / linux-2.6.git / blobdiff