2 * linux/drivers/serial/s3c2410.c
4 * Driver for onboard UARTs on the Samsung S3C24XX
6 * Based on drivers/char/serial.c and drivers/char/21285.c
8 * Ben Dooks, (c) 2003-2005 Simtec Electronics
9 * http://www.simtec.co.uk/products/SWLINUX/
13 * 22-Jul-2004 BJD Finished off device rewrite
15 * 21-Jul-2004 BJD Thanks to <herbet@13thfloor.at> for pointing out
16 * problems with baud rate and loss of IR settings. Update
17 * to add configuration via platform_device structure
19 * 28-Sep-2004 BJD Re-write for the following items
20 * - S3C2410 and S3C2440 serial support
21 * - Power Management support
22 * - Fix console via IrDA devices
23 * - SysReq (Herbert Pötzl)
24 * - Break character handling (Herbert Pötzl)
25 * - spin-lock initialisation (Dimitry Andric)
26 * - added clock control
27 * - updated init code to use platform_device info
29 * 06-Mar-2005 BJD Add s3c2440 fclk clock source
31 * 09-Mar-2005 BJD Add s3c2400 support
33 * 10-Mar-2005 LCVR Changed S3C2410_VA_UART to S3C24XX_VA_UART
36 /* Note on 2440 fclk clock source handling
38 * Whilst it is possible to use the fclk as clock source, the method
39 * of properly switching too/from this is currently un-implemented, so
40 * whichever way is configured at startup is the one that will be used.
43 /* Hote on 2410 error handling
45 * The s3c2410 manual has a love/hate affair with the contents of the
46 * UERSTAT register in the UART blocks, and keeps marking some of the
47 * error bits as reserved. Having checked with the s3c2410x01,
48 * it copes with BREAKs properly, so I am happy to ignore the RESERVED
49 * feature from the latter versions of the manual.
51 * If it becomes aparrent that latter versions of the 2410 remove these
52 * bits, then action will have to be taken to differentiate the versions
53 * and change the policy on BREAK
59 #if defined(CONFIG_SERIAL_S3C2410_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
63 #include <linux/module.h>
64 #include <linux/ioport.h>
65 #include <linux/platform_device.h>
66 #include <linux/init.h>
67 #include <linux/sysrq.h>
68 #include <linux/console.h>
69 #include <linux/tty.h>
70 #include <linux/tty_flip.h>
71 #include <linux/serial_core.h>
72 #include <linux/serial.h>
73 #include <linux/delay.h>
74 #include <linux/clk.h>
79 #include <asm/hardware.h>
81 #include <asm/arch/regs-serial.h>
82 #include <asm/arch/regs-gpio.h>
86 struct s3c24xx_uart_info {
89 unsigned int fifosize;
90 unsigned long rx_fifomask;
91 unsigned long rx_fifoshift;
92 unsigned long rx_fifofull;
93 unsigned long tx_fifomask;
94 unsigned long tx_fifoshift;
95 unsigned long tx_fifofull;
97 /* clock source control */
99 int (*get_clksrc)(struct uart_port *, struct s3c24xx_uart_clksrc *clk);
100 int (*set_clksrc)(struct uart_port *, struct s3c24xx_uart_clksrc *clk);
103 int (*reset_port)(struct uart_port *, struct s3c2410_uartcfg *);
106 struct s3c24xx_uart_port {
107 unsigned char rx_claimed;
108 unsigned char tx_claimed;
110 struct s3c24xx_uart_info *info;
111 struct s3c24xx_uart_clksrc *clksrc;
114 struct uart_port port;
118 /* configuration defines */
122 /* send debug to the low-level output routines */
124 extern void printascii(const char *);
127 s3c24xx_serial_dbg(const char *fmt, ...)
133 vsprintf(buff, fmt, va);
139 #define dbg(x...) s3c24xx_serial_dbg(x)
142 #define dbg(x...) printk(KERN_DEBUG "s3c24xx: ");
145 #define dbg(x...) do {} while(0)
148 /* UART name and device definitions */
150 #define S3C24XX_SERIAL_NAME "ttySAC"
151 #define S3C24XX_SERIAL_MAJOR 204
152 #define S3C24XX_SERIAL_MINOR 64
155 /* conversion functions */
157 #define s3c24xx_dev_to_port(__dev) (struct uart_port *)dev_get_drvdata(__dev)
158 #define s3c24xx_dev_to_cfg(__dev) (struct s3c2410_uartcfg *)((__dev)->platform_data)
160 /* we can support 3 uarts, but not always use them */
162 #ifdef CONFIG_CPU_S3C2400
168 /* port irq numbers */
170 #define TX_IRQ(port) ((port)->irq + 1)
171 #define RX_IRQ(port) ((port)->irq)
173 /* register access controls */
175 #define portaddr(port, reg) ((port)->membase + (reg))
177 #define rd_regb(port, reg) (__raw_readb(portaddr(port, reg)))
178 #define rd_regl(port, reg) (__raw_readl(portaddr(port, reg)))
180 #define wr_regb(port, reg, val) \
181 do { __raw_writeb(val, portaddr(port, reg)); } while(0)
183 #define wr_regl(port, reg, val) \
184 do { __raw_writel(val, portaddr(port, reg)); } while(0)
186 /* macros to change one thing to another */
188 #define tx_enabled(port) ((port)->unused[0])
189 #define rx_enabled(port) ((port)->unused[1])
191 /* flag to ignore all characters comming in */
192 #define RXSTAT_DUMMY_READ (0x10000000)
194 static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port)
196 return container_of(port, struct s3c24xx_uart_port, port);
199 /* translate a port to the device name */
201 static inline const char *s3c24xx_serial_portname(struct uart_port *port)
203 return to_platform_device(port->dev)->name;
206 static int s3c24xx_serial_txempty_nofifo(struct uart_port *port)
208 return (rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE);
211 static void s3c24xx_serial_rx_enable(struct uart_port *port)
214 unsigned int ucon, ufcon;
217 spin_lock_irqsave(&port->lock, flags);
219 while (--count && !s3c24xx_serial_txempty_nofifo(port))
222 ufcon = rd_regl(port, S3C2410_UFCON);
223 ufcon |= S3C2410_UFCON_RESETRX;
224 wr_regl(port, S3C2410_UFCON, ufcon);
226 ucon = rd_regl(port, S3C2410_UCON);
227 ucon |= S3C2410_UCON_RXIRQMODE;
228 wr_regl(port, S3C2410_UCON, ucon);
230 rx_enabled(port) = 1;
231 spin_unlock_irqrestore(&port->lock, flags);
234 static void s3c24xx_serial_rx_disable(struct uart_port *port)
239 spin_lock_irqsave(&port->lock, flags);
241 ucon = rd_regl(port, S3C2410_UCON);
242 ucon &= ~S3C2410_UCON_RXIRQMODE;
243 wr_regl(port, S3C2410_UCON, ucon);
245 rx_enabled(port) = 0;
246 spin_unlock_irqrestore(&port->lock, flags);
249 static void s3c24xx_serial_stop_tx(struct uart_port *port)
251 if (tx_enabled(port)) {
252 disable_irq(TX_IRQ(port));
253 tx_enabled(port) = 0;
254 if (port->flags & UPF_CONS_FLOW)
255 s3c24xx_serial_rx_enable(port);
259 static void s3c24xx_serial_start_tx(struct uart_port *port)
261 if (!tx_enabled(port)) {
262 if (port->flags & UPF_CONS_FLOW)
263 s3c24xx_serial_rx_disable(port);
265 enable_irq(TX_IRQ(port));
266 tx_enabled(port) = 1;
271 static void s3c24xx_serial_stop_rx(struct uart_port *port)
273 if (rx_enabled(port)) {
274 dbg("s3c24xx_serial_stop_rx: port=%p\n", port);
275 disable_irq(RX_IRQ(port));
276 rx_enabled(port) = 0;
280 static void s3c24xx_serial_enable_ms(struct uart_port *port)
284 static inline struct s3c24xx_uart_info *s3c24xx_port_to_info(struct uart_port *port)
286 return to_ourport(port)->info;
289 static inline struct s3c2410_uartcfg *s3c24xx_port_to_cfg(struct uart_port *port)
291 if (port->dev == NULL)
294 return (struct s3c2410_uartcfg *)port->dev->platform_data;
297 static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport,
298 unsigned long ufstat)
300 struct s3c24xx_uart_info *info = ourport->info;
302 if (ufstat & info->rx_fifofull)
303 return info->fifosize;
305 return (ufstat & info->rx_fifomask) >> info->rx_fifoshift;
309 /* ? - where has parity gone?? */
310 #define S3C2410_UERSTAT_PARITY (0x1000)
313 s3c24xx_serial_rx_chars(int irq, void *dev_id, struct pt_regs *regs)
315 struct s3c24xx_uart_port *ourport = dev_id;
316 struct uart_port *port = &ourport->port;
317 struct tty_struct *tty = port->info->tty;
318 unsigned int ufcon, ch, flag, ufstat, uerstat;
321 while (max_count-- > 0) {
322 ufcon = rd_regl(port, S3C2410_UFCON);
323 ufstat = rd_regl(port, S3C2410_UFSTAT);
325 if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
328 uerstat = rd_regl(port, S3C2410_UERSTAT);
329 ch = rd_regb(port, S3C2410_URXH);
331 if (port->flags & UPF_CONS_FLOW) {
332 int txe = s3c24xx_serial_txempty_nofifo(port);
334 if (rx_enabled(port)) {
336 rx_enabled(port) = 0;
341 ufcon |= S3C2410_UFCON_RESETRX;
342 wr_regl(port, S3C2410_UFCON, ufcon);
343 rx_enabled(port) = 1;
350 /* insert the character into the buffer */
355 if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) {
356 dbg("rxerr: port ch=0x%02x, rxs=0x%08x\n",
359 /* check for break */
360 if (uerstat & S3C2410_UERSTAT_BREAK) {
363 if (uart_handle_break(port))
367 if (uerstat & S3C2410_UERSTAT_FRAME)
368 port->icount.frame++;
369 if (uerstat & S3C2410_UERSTAT_OVERRUN)
370 port->icount.overrun++;
372 uerstat &= port->read_status_mask;
374 if (uerstat & S3C2410_UERSTAT_BREAK)
376 else if (uerstat & S3C2410_UERSTAT_PARITY)
378 else if (uerstat & ( S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_OVERRUN))
382 if (uart_handle_sysrq_char(port, ch, regs))
385 uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN, ch, flag);
390 tty_flip_buffer_push(tty);
396 static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id, struct pt_regs *regs)
398 struct s3c24xx_uart_port *ourport = id;
399 struct uart_port *port = &ourport->port;
400 struct circ_buf *xmit = &port->info->xmit;
404 wr_regb(port, S3C2410_UTXH, port->x_char);
410 /* if there isnt anything more to transmit, or the uart is now
411 * stopped, disable the uart and exit
414 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
415 s3c24xx_serial_stop_tx(port);
419 /* try and drain the buffer... */
421 while (!uart_circ_empty(xmit) && count-- > 0) {
422 if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
425 wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
426 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
430 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
431 uart_write_wakeup(port);
433 if (uart_circ_empty(xmit))
434 s3c24xx_serial_stop_tx(port);
440 static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
442 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
443 unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT);
444 unsigned long ufcon = rd_regl(port, S3C2410_UFCON);
446 if (ufcon & S3C2410_UFCON_FIFOMODE) {
447 if ((ufstat & info->tx_fifomask) != 0 ||
448 (ufstat & info->tx_fifofull))
454 return s3c24xx_serial_txempty_nofifo(port);
457 /* no modem control lines */
458 static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
460 unsigned int umstat = rd_regb(port,S3C2410_UMSTAT);
462 if (umstat & S3C2410_UMSTAT_CTS)
463 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
465 return TIOCM_CAR | TIOCM_DSR;
468 static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
470 /* todo - possibly remove AFC and do manual CTS */
473 static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state)
478 spin_lock_irqsave(&port->lock, flags);
480 ucon = rd_regl(port, S3C2410_UCON);
483 ucon |= S3C2410_UCON_SBREAK;
485 ucon &= ~S3C2410_UCON_SBREAK;
487 wr_regl(port, S3C2410_UCON, ucon);
489 spin_unlock_irqrestore(&port->lock, flags);
492 static void s3c24xx_serial_shutdown(struct uart_port *port)
494 struct s3c24xx_uart_port *ourport = to_ourport(port);
496 if (ourport->tx_claimed) {
497 free_irq(TX_IRQ(port), ourport);
498 tx_enabled(port) = 0;
499 ourport->tx_claimed = 0;
502 if (ourport->rx_claimed) {
503 free_irq(RX_IRQ(port), ourport);
504 ourport->rx_claimed = 0;
505 rx_enabled(port) = 0;
510 static int s3c24xx_serial_startup(struct uart_port *port)
512 struct s3c24xx_uart_port *ourport = to_ourport(port);
515 dbg("s3c24xx_serial_startup: port=%p (%08lx,%p)\n",
516 port->mapbase, port->membase);
518 rx_enabled(port) = 1;
520 ret = request_irq(RX_IRQ(port),
521 s3c24xx_serial_rx_chars, 0,
522 s3c24xx_serial_portname(port), ourport);
525 printk(KERN_ERR "cannot get irq %d\n", RX_IRQ(port));
529 ourport->rx_claimed = 1;
531 dbg("requesting tx irq...\n");
533 tx_enabled(port) = 1;
535 ret = request_irq(TX_IRQ(port),
536 s3c24xx_serial_tx_chars, 0,
537 s3c24xx_serial_portname(port), ourport);
540 printk(KERN_ERR "cannot get irq %d\n", TX_IRQ(port));
544 ourport->tx_claimed = 1;
546 dbg("s3c24xx_serial_startup ok\n");
548 /* the port reset code should have done the correct
549 * register setup for the port controls */
554 s3c24xx_serial_shutdown(port);
558 /* power power management control */
560 static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
563 struct s3c24xx_uart_port *ourport = to_ourport(port);
567 if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL)
568 clk_disable(ourport->baudclk);
570 clk_disable(ourport->clk);
574 clk_enable(ourport->clk);
576 if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL)
577 clk_enable(ourport->baudclk);
581 printk(KERN_ERR "s3c24xx_serial: unknown pm %d\n", level);
585 /* baud rate calculation
587 * The UARTs on the S3C2410/S3C2440 can take their clocks from a number
588 * of different sources, including the peripheral clock ("pclk") and an
589 * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk")
590 * with a programmable extra divisor.
592 * The following code goes through the clock sources, and calculates the
593 * baud clocks (and the resultant actual baud rates) and then tries to
594 * pick the closest one and select that.
601 static struct s3c24xx_uart_clksrc tmp_clksrc = {
609 s3c24xx_serial_getsource(struct uart_port *port, struct s3c24xx_uart_clksrc *c)
611 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
613 return (info->get_clksrc)(port, c);
617 s3c24xx_serial_setsource(struct uart_port *port, struct s3c24xx_uart_clksrc *c)
619 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
621 return (info->set_clksrc)(port, c);
625 struct s3c24xx_uart_clksrc *clksrc;
631 static int s3c24xx_serial_calcbaud(struct baud_calc *calc,
632 struct uart_port *port,
633 struct s3c24xx_uart_clksrc *clksrc,
638 calc->src = clk_get(port->dev, clksrc->name);
639 if (calc->src == NULL || IS_ERR(calc->src))
642 rate = clk_get_rate(calc->src);
643 rate /= clksrc->divisor;
645 calc->clksrc = clksrc;
646 calc->quot = (rate + (8 * baud)) / (16 * baud);
647 calc->calc = (rate / (calc->quot * 16));
653 static unsigned int s3c24xx_serial_getclk(struct uart_port *port,
654 struct s3c24xx_uart_clksrc **clksrc,
658 struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
659 struct s3c24xx_uart_clksrc *clkp;
660 struct baud_calc res[MAX_CLKS];
661 struct baud_calc *resptr, *best, *sptr;
667 if (cfg->clocks_size < 2) {
668 if (cfg->clocks_size == 0)
671 /* check to see if we're sourcing fclk, and if so we're
672 * going to have to update the clock source
675 if (strcmp(clkp->name, "fclk") == 0) {
676 struct s3c24xx_uart_clksrc src;
678 s3c24xx_serial_getsource(port, &src);
680 /* check that the port already using fclk, and if
681 * not, then re-select fclk
684 if (strcmp(src.name, clkp->name) == 0) {
685 s3c24xx_serial_setsource(port, clkp);
686 s3c24xx_serial_getsource(port, &src);
689 clkp->divisor = src.divisor;
692 s3c24xx_serial_calcbaud(res, port, clkp, baud);
698 for (i = 0; i < cfg->clocks_size; i++, clkp++) {
699 if (s3c24xx_serial_calcbaud(resptr, port, clkp, baud))
704 /* ok, we now need to select the best clock we found */
707 unsigned int deviation = (1<<30)|((1<<30)-1);
710 for (sptr = res; sptr < resptr; sptr++) {
712 "found clk %p (%s) quot %d, calc %d\n",
713 sptr->clksrc, sptr->clksrc->name,
714 sptr->quot, sptr->calc);
716 calc_deviation = baud - sptr->calc;
717 if (calc_deviation < 0)
718 calc_deviation = -calc_deviation;
720 if (calc_deviation < deviation) {
722 deviation = calc_deviation;
726 printk(KERN_DEBUG "best %p (deviation %d)\n", best, deviation);
729 printk(KERN_DEBUG "selected clock %p (%s) quot %d, calc %d\n",
730 best->clksrc, best->clksrc->name, best->quot, best->calc);
732 /* store results to pass back */
734 *clksrc = best->clksrc;
740 static void s3c24xx_serial_set_termios(struct uart_port *port,
741 struct termios *termios,
744 struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
745 struct s3c24xx_uart_port *ourport = to_ourport(port);
746 struct s3c24xx_uart_clksrc *clksrc = NULL;
747 struct clk *clk = NULL;
749 unsigned int baud, quot;
754 * We don't support modem control lines.
756 termios->c_cflag &= ~(HUPCL | CMSPAR);
757 termios->c_cflag |= CLOCAL;
760 * Ask the core to calculate the divisor for us.
763 baud = uart_get_baud_rate(port, termios, old, 0, 115200*8);
765 if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
766 quot = port->custom_divisor;
768 quot = s3c24xx_serial_getclk(port, &clksrc, &clk, baud);
770 /* check to see if we need to change clock source */
772 if (ourport->clksrc != clksrc || ourport->baudclk != clk) {
773 s3c24xx_serial_setsource(port, clksrc);
775 if (ourport->baudclk != NULL && !IS_ERR(ourport->baudclk)) {
776 clk_disable(ourport->baudclk);
777 ourport->baudclk = NULL;
782 ourport->clksrc = clksrc;
783 ourport->baudclk = clk;
786 switch (termios->c_cflag & CSIZE) {
788 dbg("config: 5bits/char\n");
789 ulcon = S3C2410_LCON_CS5;
792 dbg("config: 6bits/char\n");
793 ulcon = S3C2410_LCON_CS6;
796 dbg("config: 7bits/char\n");
797 ulcon = S3C2410_LCON_CS7;
801 dbg("config: 8bits/char\n");
802 ulcon = S3C2410_LCON_CS8;
806 /* preserve original lcon IR settings */
807 ulcon |= (cfg->ulcon & S3C2410_LCON_IRM);
809 if (termios->c_cflag & CSTOPB)
810 ulcon |= S3C2410_LCON_STOPB;
812 umcon = (termios->c_cflag & CRTSCTS) ? S3C2410_UMCOM_AFC : 0;
814 if (termios->c_cflag & PARENB) {
815 if (termios->c_cflag & PARODD)
816 ulcon |= S3C2410_LCON_PODD;
818 ulcon |= S3C2410_LCON_PEVEN;
820 ulcon |= S3C2410_LCON_PNONE;
823 spin_lock_irqsave(&port->lock, flags);
825 dbg("setting ulcon to %08x, brddiv to %d\n", ulcon, quot);
827 wr_regl(port, S3C2410_ULCON, ulcon);
828 wr_regl(port, S3C2410_UBRDIV, quot);
829 wr_regl(port, S3C2410_UMCON, umcon);
831 dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n",
832 rd_regl(port, S3C2410_ULCON),
833 rd_regl(port, S3C2410_UCON),
834 rd_regl(port, S3C2410_UFCON));
837 * Update the per-port timeout.
839 uart_update_timeout(port, termios->c_cflag, baud);
842 * Which character status flags are we interested in?
844 port->read_status_mask = S3C2410_UERSTAT_OVERRUN;
845 if (termios->c_iflag & INPCK)
846 port->read_status_mask |= S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_PARITY;
849 * Which character status flags should we ignore?
851 port->ignore_status_mask = 0;
852 if (termios->c_iflag & IGNPAR)
853 port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN;
854 if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR)
855 port->ignore_status_mask |= S3C2410_UERSTAT_FRAME;
858 * Ignore all characters if CREAD is not set.
860 if ((termios->c_cflag & CREAD) == 0)
861 port->ignore_status_mask |= RXSTAT_DUMMY_READ;
863 spin_unlock_irqrestore(&port->lock, flags);
866 static const char *s3c24xx_serial_type(struct uart_port *port)
868 switch (port->type) {
880 #define MAP_SIZE (0x100)
882 static void s3c24xx_serial_release_port(struct uart_port *port)
884 release_mem_region(port->mapbase, MAP_SIZE);
887 static int s3c24xx_serial_request_port(struct uart_port *port)
889 const char *name = s3c24xx_serial_portname(port);
890 return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY;
893 static void s3c24xx_serial_config_port(struct uart_port *port, int flags)
895 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
897 if (flags & UART_CONFIG_TYPE &&
898 s3c24xx_serial_request_port(port) == 0)
899 port->type = info->type;
903 * verify the new serial_struct (for TIOCSSERIAL).
906 s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
908 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
910 if (ser->type != PORT_UNKNOWN && ser->type != info->type)
917 #ifdef CONFIG_SERIAL_S3C2410_CONSOLE
919 static struct console s3c24xx_serial_console;
921 #define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console
923 #define S3C24XX_SERIAL_CONSOLE NULL
926 static struct uart_ops s3c24xx_serial_ops = {
927 .pm = s3c24xx_serial_pm,
928 .tx_empty = s3c24xx_serial_tx_empty,
929 .get_mctrl = s3c24xx_serial_get_mctrl,
930 .set_mctrl = s3c24xx_serial_set_mctrl,
931 .stop_tx = s3c24xx_serial_stop_tx,
932 .start_tx = s3c24xx_serial_start_tx,
933 .stop_rx = s3c24xx_serial_stop_rx,
934 .enable_ms = s3c24xx_serial_enable_ms,
935 .break_ctl = s3c24xx_serial_break_ctl,
936 .startup = s3c24xx_serial_startup,
937 .shutdown = s3c24xx_serial_shutdown,
938 .set_termios = s3c24xx_serial_set_termios,
939 .type = s3c24xx_serial_type,
940 .release_port = s3c24xx_serial_release_port,
941 .request_port = s3c24xx_serial_request_port,
942 .config_port = s3c24xx_serial_config_port,
943 .verify_port = s3c24xx_serial_verify_port,
947 static struct uart_driver s3c24xx_uart_drv = {
948 .owner = THIS_MODULE,
949 .dev_name = "s3c2410_serial",
951 .cons = S3C24XX_SERIAL_CONSOLE,
952 .driver_name = S3C24XX_SERIAL_NAME,
953 .major = S3C24XX_SERIAL_MAJOR,
954 .minor = S3C24XX_SERIAL_MINOR,
957 static struct s3c24xx_uart_port s3c24xx_serial_ports[NR_PORTS] = {
960 .lock = SPIN_LOCK_UNLOCKED,
962 .irq = IRQ_S3CUART_RX0,
965 .ops = &s3c24xx_serial_ops,
966 .flags = UPF_BOOT_AUTOCONF,
972 .lock = SPIN_LOCK_UNLOCKED,
974 .irq = IRQ_S3CUART_RX1,
977 .ops = &s3c24xx_serial_ops,
978 .flags = UPF_BOOT_AUTOCONF,
986 .lock = SPIN_LOCK_UNLOCKED,
988 .irq = IRQ_S3CUART_RX2,
991 .ops = &s3c24xx_serial_ops,
992 .flags = UPF_BOOT_AUTOCONF,
999 /* s3c24xx_serial_resetport
1001 * wrapper to call the specific reset for this port (reset the fifos
1005 static inline int s3c24xx_serial_resetport(struct uart_port * port,
1006 struct s3c2410_uartcfg *cfg)
1008 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1010 return (info->reset_port)(port, cfg);
1013 /* s3c24xx_serial_init_port
1015 * initialise a single serial port from the platform device given
1018 static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
1019 struct s3c24xx_uart_info *info,
1020 struct platform_device *platdev)
1022 struct uart_port *port = &ourport->port;
1023 struct s3c2410_uartcfg *cfg;
1024 struct resource *res;
1026 dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev);
1028 if (platdev == NULL)
1031 cfg = s3c24xx_dev_to_cfg(&platdev->dev);
1033 if (port->mapbase != 0)
1036 if (cfg->hwport > 3)
1039 /* setup info for port */
1040 port->dev = &platdev->dev;
1041 ourport->info = info;
1043 /* copy the info in from provided structure */
1044 ourport->port.fifosize = info->fifosize;
1046 dbg("s3c24xx_serial_init_port: %p (hw %d)...\n", port, cfg->hwport);
1050 if (cfg->uart_flags & UPF_CONS_FLOW) {
1051 dbg("s3c24xx_serial_init_port: enabling flow control\n");
1052 port->flags |= UPF_CONS_FLOW;
1055 /* sort our the physical and virtual addresses for each UART */
1057 res = platform_get_resource(platdev, IORESOURCE_MEM, 0);
1059 printk(KERN_ERR "failed to find memory resource for uart\n");
1063 dbg("resource %p (%lx..%lx)\n", res, res->start, res->end);
1065 port->mapbase = res->start;
1066 port->membase = S3C24XX_VA_UART + (res->start - S3C24XX_PA_UART);
1067 port->irq = platform_get_irq(platdev, 0);
1071 ourport->clk = clk_get(&platdev->dev, "uart");
1073 dbg("port: map=%08x, mem=%08x, irq=%d, clock=%ld\n",
1074 port->mapbase, port->membase, port->irq, port->uartclk);
1076 /* reset the fifos (and setup the uart) */
1077 s3c24xx_serial_resetport(port, cfg);
1081 /* Device driver serial port probe */
1083 static int probe_index = 0;
1085 static int s3c24xx_serial_probe(struct platform_device *dev,
1086 struct s3c24xx_uart_info *info)
1088 struct s3c24xx_uart_port *ourport;
1091 dbg("s3c24xx_serial_probe(%p, %p) %d\n", dev, info, probe_index);
1093 ourport = &s3c24xx_serial_ports[probe_index];
1096 dbg("%s: initialising port %p...\n", __FUNCTION__, ourport);
1098 ret = s3c24xx_serial_init_port(ourport, info, dev);
1102 dbg("%s: adding port\n", __FUNCTION__);
1103 uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
1104 platform_set_drvdata(dev, &ourport->port);
1112 static int s3c24xx_serial_remove(struct platform_device *dev)
1114 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1117 uart_remove_one_port(&s3c24xx_uart_drv, port);
1122 /* UART power management code */
1126 static int s3c24xx_serial_suspend(struct platform_device *dev, pm_message_t state)
1128 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1131 uart_suspend_port(&s3c24xx_uart_drv, port);
1136 static int s3c24xx_serial_resume(struct platform_device *dev)
1138 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1139 struct s3c24xx_uart_port *ourport = to_ourport(port);
1142 clk_enable(ourport->clk);
1143 s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
1144 clk_disable(ourport->clk);
1146 uart_resume_port(&s3c24xx_uart_drv, port);
1153 #define s3c24xx_serial_suspend NULL
1154 #define s3c24xx_serial_resume NULL
1157 static int s3c24xx_serial_init(struct platform_driver *drv,
1158 struct s3c24xx_uart_info *info)
1160 dbg("s3c24xx_serial_init(%p,%p)\n", drv, info);
1161 return platform_driver_register(drv);
1165 /* now comes the code to initialise either the s3c2410 or s3c2440 serial
1169 /* cpu specific variations on the serial port support */
1171 #ifdef CONFIG_CPU_S3C2400
1173 static int s3c2400_serial_getsource(struct uart_port *port,
1174 struct s3c24xx_uart_clksrc *clk)
1182 static int s3c2400_serial_setsource(struct uart_port *port,
1183 struct s3c24xx_uart_clksrc *clk)
1188 static int s3c2400_serial_resetport(struct uart_port *port,
1189 struct s3c2410_uartcfg *cfg)
1191 dbg("s3c2400_serial_resetport: port=%p (%08lx), cfg=%p\n",
1192 port, port->mapbase, cfg);
1194 wr_regl(port, S3C2410_UCON, cfg->ucon);
1195 wr_regl(port, S3C2410_ULCON, cfg->ulcon);
1197 /* reset both fifos */
1199 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1200 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1205 static struct s3c24xx_uart_info s3c2400_uart_inf = {
1206 .name = "Samsung S3C2400 UART",
1207 .type = PORT_S3C2400,
1209 .rx_fifomask = S3C2410_UFSTAT_RXMASK,
1210 .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT,
1211 .rx_fifofull = S3C2410_UFSTAT_RXFULL,
1212 .tx_fifofull = S3C2410_UFSTAT_TXFULL,
1213 .tx_fifomask = S3C2410_UFSTAT_TXMASK,
1214 .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT,
1215 .get_clksrc = s3c2400_serial_getsource,
1216 .set_clksrc = s3c2400_serial_setsource,
1217 .reset_port = s3c2400_serial_resetport,
1220 static int s3c2400_serial_probe(struct platform_device *dev)
1222 return s3c24xx_serial_probe(dev, &s3c2400_uart_inf);
1225 static struct platform_driver s3c2400_serial_drv = {
1226 .probe = s3c2400_serial_probe,
1227 .remove = s3c24xx_serial_remove,
1228 .suspend = s3c24xx_serial_suspend,
1229 .resume = s3c24xx_serial_resume,
1231 .name = "s3c2400-uart",
1232 .owner = THIS_MODULE,
1236 static inline int s3c2400_serial_init(void)
1238 return s3c24xx_serial_init(&s3c2400_serial_drv, &s3c2400_uart_inf);
1241 static inline void s3c2400_serial_exit(void)
1243 platform_driver_unregister(&s3c2400_serial_drv);
1246 #define s3c2400_uart_inf_at &s3c2400_uart_inf
1249 static inline int s3c2400_serial_init(void)
1254 static inline void s3c2400_serial_exit(void)
1258 #define s3c2400_uart_inf_at NULL
1260 #endif /* CONFIG_CPU_S3C2400 */
1262 /* S3C2410 support */
1264 #ifdef CONFIG_CPU_S3C2410
1266 static int s3c2410_serial_setsource(struct uart_port *port,
1267 struct s3c24xx_uart_clksrc *clk)
1269 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1271 if (strcmp(clk->name, "uclk") == 0)
1272 ucon |= S3C2410_UCON_UCLK;
1274 ucon &= ~S3C2410_UCON_UCLK;
1276 wr_regl(port, S3C2410_UCON, ucon);
1280 static int s3c2410_serial_getsource(struct uart_port *port,
1281 struct s3c24xx_uart_clksrc *clk)
1283 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1286 clk->name = (ucon & S3C2410_UCON_UCLK) ? "uclk" : "pclk";
1291 static int s3c2410_serial_resetport(struct uart_port *port,
1292 struct s3c2410_uartcfg *cfg)
1294 dbg("s3c2410_serial_resetport: port=%p (%08lx), cfg=%p\n",
1295 port, port->mapbase, cfg);
1297 wr_regl(port, S3C2410_UCON, cfg->ucon);
1298 wr_regl(port, S3C2410_ULCON, cfg->ulcon);
1300 /* reset both fifos */
1302 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1303 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1308 static struct s3c24xx_uart_info s3c2410_uart_inf = {
1309 .name = "Samsung S3C2410 UART",
1310 .type = PORT_S3C2410,
1312 .rx_fifomask = S3C2410_UFSTAT_RXMASK,
1313 .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT,
1314 .rx_fifofull = S3C2410_UFSTAT_RXFULL,
1315 .tx_fifofull = S3C2410_UFSTAT_TXFULL,
1316 .tx_fifomask = S3C2410_UFSTAT_TXMASK,
1317 .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT,
1318 .get_clksrc = s3c2410_serial_getsource,
1319 .set_clksrc = s3c2410_serial_setsource,
1320 .reset_port = s3c2410_serial_resetport,
1323 /* device management */
1325 static int s3c2410_serial_probe(struct platform_device *dev)
1327 return s3c24xx_serial_probe(dev, &s3c2410_uart_inf);
1330 static struct platform_driver s3c2410_serial_drv = {
1331 .probe = s3c2410_serial_probe,
1332 .remove = s3c24xx_serial_remove,
1333 .suspend = s3c24xx_serial_suspend,
1334 .resume = s3c24xx_serial_resume,
1336 .name = "s3c2410-uart",
1337 .owner = THIS_MODULE,
1341 static inline int s3c2410_serial_init(void)
1343 return s3c24xx_serial_init(&s3c2410_serial_drv, &s3c2410_uart_inf);
1346 static inline void s3c2410_serial_exit(void)
1348 platform_driver_unregister(&s3c2410_serial_drv);
1351 #define s3c2410_uart_inf_at &s3c2410_uart_inf
1354 static inline int s3c2410_serial_init(void)
1359 static inline void s3c2410_serial_exit(void)
1363 #define s3c2410_uart_inf_at NULL
1365 #endif /* CONFIG_CPU_S3C2410 */
1367 #if defined(CONFIG_CPU_S3C2440) || defined(CONFIG_CPU_S3C2442)
1369 static int s3c2440_serial_setsource(struct uart_port *port,
1370 struct s3c24xx_uart_clksrc *clk)
1372 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1374 // todo - proper fclk<>nonfclk switch //
1376 ucon &= ~S3C2440_UCON_CLKMASK;
1378 if (strcmp(clk->name, "uclk") == 0)
1379 ucon |= S3C2440_UCON_UCLK;
1380 else if (strcmp(clk->name, "pclk") == 0)
1381 ucon |= S3C2440_UCON_PCLK;
1382 else if (strcmp(clk->name, "fclk") == 0)
1383 ucon |= S3C2440_UCON_FCLK;
1385 printk(KERN_ERR "unknown clock source %s\n", clk->name);
1389 wr_regl(port, S3C2410_UCON, ucon);
1394 static int s3c2440_serial_getsource(struct uart_port *port,
1395 struct s3c24xx_uart_clksrc *clk)
1397 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1398 unsigned long ucon0, ucon1, ucon2;
1400 switch (ucon & S3C2440_UCON_CLKMASK) {
1401 case S3C2440_UCON_UCLK:
1406 case S3C2440_UCON_PCLK:
1407 case S3C2440_UCON_PCLK2:
1412 case S3C2440_UCON_FCLK:
1413 /* the fun of calculating the uart divisors on
1416 ucon0 = __raw_readl(S3C24XX_VA_UART0 + S3C2410_UCON);
1417 ucon1 = __raw_readl(S3C24XX_VA_UART1 + S3C2410_UCON);
1418 ucon2 = __raw_readl(S3C24XX_VA_UART2 + S3C2410_UCON);
1420 printk("ucons: %08lx, %08lx, %08lx\n", ucon0, ucon1, ucon2);
1422 ucon0 &= S3C2440_UCON0_DIVMASK;
1423 ucon1 &= S3C2440_UCON1_DIVMASK;
1424 ucon2 &= S3C2440_UCON2_DIVMASK;
1427 clk->divisor = ucon0 >> S3C2440_UCON_DIVSHIFT;
1429 } else if (ucon1 != 0) {
1430 clk->divisor = ucon1 >> S3C2440_UCON_DIVSHIFT;
1432 } else if (ucon2 != 0) {
1433 clk->divisor = ucon2 >> S3C2440_UCON_DIVSHIFT;
1436 /* manual calims 44, seems to be 9 */
1447 static int s3c2440_serial_resetport(struct uart_port *port,
1448 struct s3c2410_uartcfg *cfg)
1450 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1452 dbg("s3c2440_serial_resetport: port=%p (%08lx), cfg=%p\n",
1453 port, port->mapbase, cfg);
1455 /* ensure we don't change the clock settings... */
1457 ucon &= (S3C2440_UCON0_DIVMASK | (3<<10));
1459 wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
1460 wr_regl(port, S3C2410_ULCON, cfg->ulcon);
1462 /* reset both fifos */
1464 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1465 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1470 static struct s3c24xx_uart_info s3c2440_uart_inf = {
1471 .name = "Samsung S3C2440 UART",
1472 .type = PORT_S3C2440,
1474 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
1475 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
1476 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
1477 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
1478 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
1479 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
1480 .get_clksrc = s3c2440_serial_getsource,
1481 .set_clksrc = s3c2440_serial_setsource,
1482 .reset_port = s3c2440_serial_resetport,
1485 /* device management */
1487 static int s3c2440_serial_probe(struct platform_device *dev)
1489 dbg("s3c2440_serial_probe: dev=%p\n", dev);
1490 return s3c24xx_serial_probe(dev, &s3c2440_uart_inf);
1493 static struct platform_driver s3c2440_serial_drv = {
1494 .probe = s3c2440_serial_probe,
1495 .remove = s3c24xx_serial_remove,
1496 .suspend = s3c24xx_serial_suspend,
1497 .resume = s3c24xx_serial_resume,
1499 .name = "s3c2440-uart",
1500 .owner = THIS_MODULE,
1505 static inline int s3c2440_serial_init(void)
1507 return s3c24xx_serial_init(&s3c2440_serial_drv, &s3c2440_uart_inf);
1510 static inline void s3c2440_serial_exit(void)
1512 platform_driver_unregister(&s3c2440_serial_drv);
1515 #define s3c2440_uart_inf_at &s3c2440_uart_inf
1518 static inline int s3c2440_serial_init(void)
1523 static inline void s3c2440_serial_exit(void)
1527 #define s3c2440_uart_inf_at NULL
1528 #endif /* CONFIG_CPU_S3C2440 */
1530 #if defined(CONFIG_CPU_S3C2412) || defined(CONFIG_CPU_S3C2413)
1532 static int s3c2412_serial_setsource(struct uart_port *port,
1533 struct s3c24xx_uart_clksrc *clk)
1535 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1537 ucon &= ~S3C2412_UCON_CLKMASK;
1539 if (strcmp(clk->name, "uclk") == 0)
1540 ucon |= S3C2440_UCON_UCLK;
1541 else if (strcmp(clk->name, "pclk") == 0)
1542 ucon |= S3C2440_UCON_PCLK;
1543 else if (strcmp(clk->name, "usysclk") == 0)
1544 ucon |= S3C2412_UCON_USYSCLK;
1546 printk(KERN_ERR "unknown clock source %s\n", clk->name);
1550 wr_regl(port, S3C2410_UCON, ucon);
1555 static int s3c2412_serial_getsource(struct uart_port *port,
1556 struct s3c24xx_uart_clksrc *clk)
1558 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1560 switch (ucon & S3C2412_UCON_CLKMASK) {
1561 case S3C2412_UCON_UCLK:
1566 case S3C2412_UCON_PCLK:
1567 case S3C2412_UCON_PCLK2:
1572 case S3C2412_UCON_USYSCLK:
1574 clk->name = "usysclk";
1581 static int s3c2412_serial_resetport(struct uart_port *port,
1582 struct s3c2410_uartcfg *cfg)
1584 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1586 dbg("%s: port=%p (%08lx), cfg=%p\n",
1587 __FUNCTION__, port, port->mapbase, cfg);
1589 /* ensure we don't change the clock settings... */
1591 ucon &= S3C2412_UCON_CLKMASK;
1593 wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
1594 wr_regl(port, S3C2410_ULCON, cfg->ulcon);
1596 /* reset both fifos */
1598 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1599 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1604 static struct s3c24xx_uart_info s3c2412_uart_inf = {
1605 .name = "Samsung S3C2412 UART",
1606 .type = PORT_S3C2412,
1608 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
1609 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
1610 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
1611 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
1612 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
1613 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
1614 .get_clksrc = s3c2412_serial_getsource,
1615 .set_clksrc = s3c2412_serial_setsource,
1616 .reset_port = s3c2412_serial_resetport,
1619 /* device management */
1621 static int s3c2412_serial_probe(struct platform_device *dev)
1623 dbg("s3c2440_serial_probe: dev=%p\n", dev);
1624 return s3c24xx_serial_probe(dev, &s3c2440_uart_inf);
1627 static struct platform_driver s3c2412_serial_drv = {
1628 .probe = s3c2412_serial_probe,
1629 .remove = s3c24xx_serial_remove,
1630 .suspend = s3c24xx_serial_suspend,
1631 .resume = s3c24xx_serial_resume,
1633 .name = "s3c2412-uart",
1634 .owner = THIS_MODULE,
1639 static inline int s3c2412_serial_init(void)
1641 return s3c24xx_serial_init(&s3c2412_serial_drv, &s3c2412_uart_inf);
1644 static inline void s3c2412_serial_exit(void)
1646 platform_driver_unregister(&s3c2412_serial_drv);
1649 #define s3c2412_uart_inf_at &s3c2412_uart_inf
1652 static inline int s3c2412_serial_init(void)
1657 static inline void s3c2412_serial_exit(void)
1661 #define s3c2412_uart_inf_at NULL
1662 #endif /* CONFIG_CPU_S3C2440 */
1665 /* module initialisation code */
1667 static int __init s3c24xx_serial_modinit(void)
1671 ret = uart_register_driver(&s3c24xx_uart_drv);
1673 printk(KERN_ERR "failed to register UART driver\n");
1677 s3c2400_serial_init();
1678 s3c2410_serial_init();
1679 s3c2412_serial_init();
1680 s3c2440_serial_init();
1685 static void __exit s3c24xx_serial_modexit(void)
1687 s3c2400_serial_exit();
1688 s3c2410_serial_exit();
1689 s3c2412_serial_exit();
1690 s3c2440_serial_exit();
1692 uart_unregister_driver(&s3c24xx_uart_drv);
1696 module_init(s3c24xx_serial_modinit);
1697 module_exit(s3c24xx_serial_modexit);
1701 #ifdef CONFIG_SERIAL_S3C2410_CONSOLE
1703 static struct uart_port *cons_uart;
1706 s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
1708 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1709 unsigned long ufstat, utrstat;
1711 if (ufcon & S3C2410_UFCON_FIFOMODE) {
1712 /* fifo mode - check ammount of data in fifo registers... */
1714 ufstat = rd_regl(port, S3C2410_UFSTAT);
1715 return (ufstat & info->tx_fifofull) ? 0 : 1;
1718 /* in non-fifo mode, we go and use the tx buffer empty */
1720 utrstat = rd_regl(port, S3C2410_UTRSTAT);
1721 return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
1725 s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
1727 unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON);
1728 while (!s3c24xx_serial_console_txrdy(port, ufcon))
1730 wr_regb(cons_uart, S3C2410_UTXH, ch);
1734 s3c24xx_serial_console_write(struct console *co, const char *s,
1737 uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar);
1741 s3c24xx_serial_get_options(struct uart_port *port, int *baud,
1742 int *parity, int *bits)
1744 struct s3c24xx_uart_clksrc clksrc;
1748 unsigned int ubrdiv;
1751 ulcon = rd_regl(port, S3C2410_ULCON);
1752 ucon = rd_regl(port, S3C2410_UCON);
1753 ubrdiv = rd_regl(port, S3C2410_UBRDIV);
1755 dbg("s3c24xx_serial_get_options: port=%p\n"
1756 "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n",
1757 port, ulcon, ucon, ubrdiv);
1759 if ((ucon & 0xf) != 0) {
1760 /* consider the serial port configured if the tx/rx mode set */
1762 switch (ulcon & S3C2410_LCON_CSMASK) {
1763 case S3C2410_LCON_CS5:
1766 case S3C2410_LCON_CS6:
1769 case S3C2410_LCON_CS7:
1773 case S3C2410_LCON_CS8:
1778 switch (ulcon & S3C2410_LCON_PMASK) {
1779 case S3C2410_LCON_PEVEN:
1783 case S3C2410_LCON_PODD:
1787 case S3C2410_LCON_PNONE:
1792 /* now calculate the baud rate */
1794 s3c24xx_serial_getsource(port, &clksrc);
1796 clk = clk_get(port->dev, clksrc.name);
1797 if (!IS_ERR(clk) && clk != NULL)
1798 rate = clk_get_rate(clk) / clksrc.divisor;
1803 *baud = rate / ( 16 * (ubrdiv + 1));
1804 dbg("calculated baud %d\n", *baud);
1809 /* s3c24xx_serial_init_ports
1811 * initialise the serial ports from the machine provided initialisation
1815 static int s3c24xx_serial_init_ports(struct s3c24xx_uart_info *info)
1817 struct s3c24xx_uart_port *ptr = s3c24xx_serial_ports;
1818 struct platform_device **platdev_ptr;
1821 dbg("s3c24xx_serial_init_ports: initialising ports...\n");
1823 platdev_ptr = s3c24xx_uart_devs;
1825 for (i = 0; i < NR_PORTS; i++, ptr++, platdev_ptr++) {
1826 s3c24xx_serial_init_port(ptr, info, *platdev_ptr);
1833 s3c24xx_serial_console_setup(struct console *co, char *options)
1835 struct uart_port *port;
1841 dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n",
1842 co, co->index, options);
1844 /* is this a valid port */
1846 if (co->index == -1 || co->index >= NR_PORTS)
1849 port = &s3c24xx_serial_ports[co->index].port;
1851 /* is the port configured? */
1853 if (port->mapbase == 0x0) {
1855 port = &s3c24xx_serial_ports[co->index].port;
1860 dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index);
1863 * Check whether an invalid uart number has been specified, and
1864 * if so, search for the first available port that does have
1868 uart_parse_options(options, &baud, &parity, &bits, &flow);
1870 s3c24xx_serial_get_options(port, &baud, &parity, &bits);
1872 dbg("s3c24xx_serial_console_setup: baud %d\n", baud);
1874 return uart_set_options(port, co, baud, parity, bits, flow);
1877 /* s3c24xx_serial_initconsole
1879 * initialise the console from one of the uart drivers
1882 static struct console s3c24xx_serial_console =
1884 .name = S3C24XX_SERIAL_NAME,
1885 .device = uart_console_device,
1886 .flags = CON_PRINTBUFFER,
1888 .write = s3c24xx_serial_console_write,
1889 .setup = s3c24xx_serial_console_setup
1892 static int s3c24xx_serial_initconsole(void)
1894 struct s3c24xx_uart_info *info;
1895 struct platform_device *dev = s3c24xx_uart_devs[0];
1897 dbg("s3c24xx_serial_initconsole\n");
1899 /* select driver based on the cpu */
1902 printk(KERN_ERR "s3c24xx: no devices for console init\n");
1906 if (strcmp(dev->name, "s3c2400-uart") == 0) {
1907 info = s3c2400_uart_inf_at;
1908 } else if (strcmp(dev->name, "s3c2410-uart") == 0) {
1909 info = s3c2410_uart_inf_at;
1910 } else if (strcmp(dev->name, "s3c2440-uart") == 0) {
1911 info = s3c2440_uart_inf_at;
1912 } else if (strcmp(dev->name, "s3c2412-uart") == 0) {
1913 info = s3c2412_uart_inf_at;
1915 printk(KERN_ERR "s3c24xx: no driver for %s\n", dev->name);
1920 printk(KERN_ERR "s3c24xx: no driver for console\n");
1924 s3c24xx_serial_console.data = &s3c24xx_uart_drv;
1925 s3c24xx_serial_init_ports(info);
1927 register_console(&s3c24xx_serial_console);
1931 console_initcall(s3c24xx_serial_initconsole);
1933 #endif /* CONFIG_SERIAL_S3C2410_CONSOLE */
1935 MODULE_LICENSE("GPL");
1936 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
1937 MODULE_DESCRIPTION("Samsung S3C2410/S3C2440/S3C2412 Serial port driver");