4 * Driver for M32R serial ports
6 * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
7 * Based on drivers/serial/8250.c.
9 * Copyright (C) 2001 Russell King.
10 * Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
19 * A note about mapbase / membase
21 * mapbase is the physical address of the IO port. Currently, we don't
22 * support this very well, and it may well be dropped from this driver
23 * in future. As such, mapbase should be NULL.
25 * membase is an 'ioremapped' cookie. This is compatible with the old
26 * serial.c driver, and is currently the preferred form.
28 #include <linux/config.h>
30 #if defined(CONFIG_SERIAL_M32R_SIO_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
34 #include <linux/module.h>
35 #include <linux/tty.h>
36 #include <linux/ioport.h>
37 #include <linux/init.h>
38 #include <linux/console.h>
39 #include <linux/sysrq.h>
40 #include <linux/serial.h>
41 #include <linux/serialP.h>
42 #include <linux/delay.h>
48 #define PORT_M32R_BASE PORT_M32R_SIO
49 #define PORT_INDEX(x) (x - PORT_M32R_BASE + 1)
50 #define BAUD_RATE 115200
52 #include <linux/serial_core.h>
54 #include "m32r_sio_reg.h"
60 #define DEBUG_AUTOCONF(fmt...) printk(fmt)
62 #define DEBUG_AUTOCONF(fmt...) do { } while (0)
66 #define DEBUG_INTR(fmt...) printk(fmt)
68 #define DEBUG_INTR(fmt...) do { } while (0)
71 #define PASS_LIMIT 256
74 * We default to IRQ0 for the "no irq" hack. Some
75 * machine types want others as well - they're free
76 * to redefine this in their header file.
78 #define is_real_interrupt(irq) ((irq) != 0)
80 #include <asm/serial.h>
82 /* Standard COM flags */
83 #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
86 * SERIAL_PORT_DFNS tells us about built-in ports that have no
87 * standard enumeration mechanism. Platforms that can find all
88 * serial ports via mechanisms like ACPI or PCI need not supply it.
90 #undef SERIAL_PORT_DFNS
91 #if defined(CONFIG_PLAT_USRV)
93 #define SERIAL_PORT_DFNS \
94 /* UART CLK PORT IRQ FLAGS */ \
95 { 0, BASE_BAUD, 0x3F8, PLD_IRQ_UART0, STD_COM_FLAGS }, /* ttyS0 */ \
96 { 0, BASE_BAUD, 0x2F8, PLD_IRQ_UART1, STD_COM_FLAGS }, /* ttyS1 */
98 #else /* !CONFIG_PLAT_USRV */
100 #if defined(CONFIG_SERIAL_M32R_PLDSIO)
101 #define SERIAL_PORT_DFNS \
102 { 0, BASE_BAUD, ((unsigned long)PLD_ESIO0CR), PLD_IRQ_SIO0_RCV, \
103 STD_COM_FLAGS }, /* ttyS0 */
105 #define SERIAL_PORT_DFNS \
106 { 0, BASE_BAUD, M32R_SIO_OFFSET, M32R_IRQ_SIO0_R, \
107 STD_COM_FLAGS }, /* ttyS0 */
110 #endif /* !CONFIG_PLAT_USRV */
112 static struct old_serial_port old_serial_port[] = {
113 SERIAL_PORT_DFNS /* defined in asm/serial.h */
116 #define UART_NR ARRAY_SIZE(old_serial_port)
118 struct uart_sio_port {
119 struct uart_port port;
120 struct timer_list timer; /* "no irq" timer */
121 struct list_head list; /* ports on this IRQ */
126 unsigned char mcr_mask; /* mask of user bits */
127 unsigned char mcr_force; /* mask of forced bits */
128 unsigned char lsr_break_flag;
131 * We provide a per-port pm hook.
133 void (*pm)(struct uart_port *port,
134 unsigned int state, unsigned int old);
139 struct list_head *head;
142 static struct irq_info irq_lists[NR_IRQS];
145 * Here we define the default xmit fifo size used for each type of UART.
147 static const struct serial_uart_config uart_config[] = {
150 .dfl_xmit_fifo_size = 1,
153 [PORT_INDEX(PORT_M32R_SIO)] = {
155 .dfl_xmit_fifo_size = 1,
160 #ifdef CONFIG_SERIAL_M32R_PLDSIO
162 #define __sio_in(x) inw((unsigned long)(x))
163 #define __sio_out(v,x) outw((v),(unsigned long)(x))
165 static inline void sio_set_baud_rate(unsigned long baud)
167 unsigned short sbaud;
168 sbaud = (boot_cpu_data.bus_clock / (baud * 4))-1;
169 __sio_out(sbaud, PLD_ESIO0BAUR);
172 static void sio_reset(void)
176 tmp = __sio_in(PLD_ESIO0RXB);
177 tmp = __sio_in(PLD_ESIO0RXB);
178 tmp = __sio_in(PLD_ESIO0CR);
179 sio_set_baud_rate(BAUD_RATE);
180 __sio_out(0x0300, PLD_ESIO0CR);
181 __sio_out(0x0003, PLD_ESIO0CR);
184 static void sio_init(void)
188 tmp = __sio_in(PLD_ESIO0RXB);
189 tmp = __sio_in(PLD_ESIO0RXB);
190 tmp = __sio_in(PLD_ESIO0CR);
191 __sio_out(0x0300, PLD_ESIO0CR);
192 __sio_out(0x0003, PLD_ESIO0CR);
195 static void sio_error(int *status)
197 printk("SIO0 error[%04x]\n", *status);
200 } while ((*status = __sio_in(PLD_ESIO0CR)) != 3);
203 #else /* not CONFIG_SERIAL_M32R_PLDSIO */
205 #define __sio_in(x) inl(x)
206 #define __sio_out(v,x) outl((v),(x))
208 static inline void sio_set_baud_rate(unsigned long baud)
212 i = boot_cpu_data.bus_clock / (baud * 16);
213 j = (boot_cpu_data.bus_clock - (i * baud * 16)) / baud;
217 __sio_out(i, M32R_SIO0_BAUR_PORTL);
218 __sio_out(j, M32R_SIO0_RBAUR_PORTL);
221 static void sio_reset(void)
223 __sio_out(0x00000300, M32R_SIO0_CR_PORTL); /* init status */
224 __sio_out(0x00000800, M32R_SIO0_MOD1_PORTL); /* 8bit */
225 __sio_out(0x00000080, M32R_SIO0_MOD0_PORTL); /* 1stop non */
226 sio_set_baud_rate(BAUD_RATE);
227 __sio_out(0x00000000, M32R_SIO0_TRCR_PORTL);
228 __sio_out(0x00000003, M32R_SIO0_CR_PORTL); /* RXCEN */
231 static void sio_init(void)
235 tmp = __sio_in(M32R_SIO0_RXB_PORTL);
236 tmp = __sio_in(M32R_SIO0_RXB_PORTL);
237 tmp = __sio_in(M32R_SIO0_STS_PORTL);
238 __sio_out(0x00000003, M32R_SIO0_CR_PORTL);
241 static void sio_error(int *status)
243 printk("SIO0 error[%04x]\n", *status);
246 } while ((*status = __sio_in(M32R_SIO0_CR_PORTL)) != 3);
249 #endif /* CONFIG_SERIAL_M32R_PLDSIO */
251 static _INLINE_ unsigned int sio_in(struct uart_sio_port *up, int offset)
253 return __sio_in(up->port.iobase + offset);
256 static _INLINE_ void sio_out(struct uart_sio_port *up, int offset, int value)
258 __sio_out(value, up->port.iobase + offset);
261 static _INLINE_ unsigned int serial_in(struct uart_sio_port *up, int offset)
266 return __sio_in(offset);
270 serial_out(struct uart_sio_port *up, int offset, int value)
275 __sio_out(value, offset);
278 static void m32r_sio_stop_tx(struct uart_port *port, unsigned int tty_stop)
280 struct uart_sio_port *up = (struct uart_sio_port *)port;
282 if (up->ier & UART_IER_THRI) {
283 up->ier &= ~UART_IER_THRI;
284 serial_out(up, UART_IER, up->ier);
288 static void m32r_sio_start_tx(struct uart_port *port, unsigned int tty_start)
290 #ifdef CONFIG_SERIAL_M32R_PLDSIO
291 struct uart_sio_port *up = (struct uart_sio_port *)port;
292 struct circ_buf *xmit = &up->port.info->xmit;
294 if (!(up->ier & UART_IER_THRI)) {
295 up->ier |= UART_IER_THRI;
296 serial_out(up, UART_IER, up->ier);
297 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
298 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
299 up->port.icount.tx++;
301 while((serial_in(up, UART_LSR) & UART_EMPTY) != UART_EMPTY);
303 struct uart_sio_port *up = (struct uart_sio_port *)port;
305 if (!(up->ier & UART_IER_THRI)) {
306 up->ier |= UART_IER_THRI;
307 serial_out(up, UART_IER, up->ier);
312 static void m32r_sio_stop_rx(struct uart_port *port)
314 struct uart_sio_port *up = (struct uart_sio_port *)port;
316 up->ier &= ~UART_IER_RLSI;
317 up->port.read_status_mask &= ~UART_LSR_DR;
318 serial_out(up, UART_IER, up->ier);
321 static void m32r_sio_enable_ms(struct uart_port *port)
323 struct uart_sio_port *up = (struct uart_sio_port *)port;
325 up->ier |= UART_IER_MSI;
326 serial_out(up, UART_IER, up->ier);
329 static _INLINE_ void receive_chars(struct uart_sio_port *up, int *status,
330 struct pt_regs *regs)
332 struct tty_struct *tty = up->port.info->tty;
337 if (unlikely(tty->flip.count >= TTY_FLIPBUF_SIZE)) {
338 tty->flip.work.func((void *)tty);
339 if (tty->flip.count >= TTY_FLIPBUF_SIZE)
340 return; // if TTY_DONT_FLIP is set
342 ch = sio_in(up, SIORXB);
343 *tty->flip.char_buf_ptr = ch;
344 *tty->flip.flag_buf_ptr = TTY_NORMAL;
345 up->port.icount.rx++;
347 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
348 UART_LSR_FE | UART_LSR_OE))) {
350 * For statistics only
352 if (*status & UART_LSR_BI) {
353 *status &= ~(UART_LSR_FE | UART_LSR_PE);
354 up->port.icount.brk++;
356 * We do the SysRQ and SAK checking
357 * here because otherwise the break
358 * may get masked by ignore_status_mask
359 * or read_status_mask.
361 if (uart_handle_break(&up->port))
363 } else if (*status & UART_LSR_PE)
364 up->port.icount.parity++;
365 else if (*status & UART_LSR_FE)
366 up->port.icount.frame++;
367 if (*status & UART_LSR_OE)
368 up->port.icount.overrun++;
371 * Mask off conditions which should be ingored.
373 *status &= up->port.read_status_mask;
375 if (up->port.line == up->port.cons->index) {
376 /* Recover the break flag from console xmit */
377 *status |= up->lsr_break_flag;
378 up->lsr_break_flag = 0;
381 if (*status & UART_LSR_BI) {
382 DEBUG_INTR("handling break....");
383 *tty->flip.flag_buf_ptr = TTY_BREAK;
384 } else if (*status & UART_LSR_PE)
385 *tty->flip.flag_buf_ptr = TTY_PARITY;
386 else if (*status & UART_LSR_FE)
387 *tty->flip.flag_buf_ptr = TTY_FRAME;
389 if (uart_handle_sysrq_char(&up->port, ch, regs))
391 if ((*status & up->port.ignore_status_mask) == 0) {
392 tty->flip.flag_buf_ptr++;
393 tty->flip.char_buf_ptr++;
396 if ((*status & UART_LSR_OE) &&
397 tty->flip.count < TTY_FLIPBUF_SIZE) {
399 * Overrun is special, since it's reported
400 * immediately, and doesn't affect the current
403 *tty->flip.flag_buf_ptr = TTY_OVERRUN;
404 tty->flip.flag_buf_ptr++;
405 tty->flip.char_buf_ptr++;
409 *status = serial_in(up, UART_LSR);
410 } while ((*status & UART_LSR_DR) && (max_count-- > 0));
411 tty_flip_buffer_push(tty);
414 static _INLINE_ void transmit_chars(struct uart_sio_port *up)
416 struct circ_buf *xmit = &up->port.info->xmit;
419 if (up->port.x_char) {
420 #ifndef CONFIG_SERIAL_M32R_PLDSIO /* XXX */
421 serial_out(up, UART_TX, up->port.x_char);
423 up->port.icount.tx++;
427 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
428 m32r_sio_stop_tx(&up->port, 0);
432 count = up->port.fifosize;
434 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
435 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
436 up->port.icount.tx++;
437 if (uart_circ_empty(xmit))
439 while (!serial_in(up, UART_LSR) & UART_LSR_THRE);
441 } while (--count > 0);
443 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
444 uart_write_wakeup(&up->port);
446 DEBUG_INTR("THRE...");
448 if (uart_circ_empty(xmit))
449 m32r_sio_stop_tx(&up->port, 0);
453 * This handles the interrupt from one port.
455 static inline void m32r_sio_handle_port(struct uart_sio_port *up,
456 unsigned int status, struct pt_regs *regs)
458 DEBUG_INTR("status = %x...", status);
461 receive_chars(up, &status, regs);
467 * This is the serial driver's interrupt routine.
469 * Arjan thinks the old way was overly complex, so it got simplified.
470 * Alan disagrees, saying that need the complexity to handle the weird
471 * nature of ISA shared interrupts. (This is a special exception.)
473 * In order to handle ISA shared interrupts properly, we need to check
474 * that all ports have been serviced, and therefore the ISA interrupt
475 * line has been de-asserted.
477 * This means we need to loop through all ports. checking that they
478 * don't have an interrupt pending.
480 static irqreturn_t m32r_sio_interrupt(int irq, void *dev_id,
481 struct pt_regs *regs)
483 struct irq_info *i = dev_id;
484 struct list_head *l, *end = NULL;
485 int pass_counter = 0;
487 DEBUG_INTR("m32r_sio_interrupt(%d)...", irq);
489 #ifdef CONFIG_SERIAL_M32R_PLDSIO
490 // if (irq == PLD_IRQ_SIO0_SND)
491 // irq = PLD_IRQ_SIO0_RCV;
493 if (irq == M32R_IRQ_SIO0_S)
494 irq = M32R_IRQ_SIO0_R;
501 struct uart_sio_port *up;
504 up = list_entry(l, struct uart_sio_port, list);
506 sts = sio_in(up, SIOSTS);
508 spin_lock(&up->port.lock);
509 m32r_sio_handle_port(up, sts, regs);
510 spin_unlock(&up->port.lock);
513 } else if (end == NULL)
518 if (l == i->head && pass_counter++ > PASS_LIMIT) {
525 spin_unlock(&i->lock);
527 DEBUG_INTR("end.\n");
533 * To support ISA shared interrupts, we need to have one interrupt
534 * handler that ensures that the IRQ line has been deasserted
535 * before returning. Failing to do this will result in the IRQ
536 * line being stuck active, and, since ISA irqs are edge triggered,
537 * no more IRQs will be seen.
539 static void serial_do_unlink(struct irq_info *i, struct uart_sio_port *up)
541 spin_lock_irq(&i->lock);
543 if (!list_empty(i->head)) {
544 if (i->head == &up->list)
545 i->head = i->head->next;
548 BUG_ON(i->head != &up->list);
552 spin_unlock_irq(&i->lock);
555 static int serial_link_irq_chain(struct uart_sio_port *up)
557 struct irq_info *i = irq_lists + up->port.irq;
558 int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? SA_SHIRQ : 0;
560 spin_lock_irq(&i->lock);
563 list_add(&up->list, i->head);
564 spin_unlock_irq(&i->lock);
568 INIT_LIST_HEAD(&up->list);
570 spin_unlock_irq(&i->lock);
572 ret = request_irq(up->port.irq, m32r_sio_interrupt,
573 irq_flags, "SIO0-RX", i);
574 ret |= request_irq(up->port.irq + 1, m32r_sio_interrupt,
575 irq_flags, "SIO0-TX", i);
577 serial_do_unlink(i, up);
583 static void serial_unlink_irq_chain(struct uart_sio_port *up)
585 struct irq_info *i = irq_lists + up->port.irq;
587 BUG_ON(i->head == NULL);
589 if (list_empty(i->head)) {
590 free_irq(up->port.irq, i);
591 free_irq(up->port.irq + 1, i);
594 serial_do_unlink(i, up);
598 * This function is used to handle ports that do not have an interrupt.
600 static void m32r_sio_timeout(unsigned long data)
602 struct uart_sio_port *up = (struct uart_sio_port *)data;
603 unsigned int timeout;
606 sts = sio_in(up, SIOSTS);
608 spin_lock(&up->port.lock);
609 m32r_sio_handle_port(up, sts, NULL);
610 spin_unlock(&up->port.lock);
613 timeout = up->port.timeout;
614 timeout = timeout > 6 ? (timeout / 2 - 2) : 1;
615 mod_timer(&up->timer, jiffies + timeout);
618 static unsigned int m32r_sio_tx_empty(struct uart_port *port)
620 struct uart_sio_port *up = (struct uart_sio_port *)port;
624 spin_lock_irqsave(&up->port.lock, flags);
625 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
626 spin_unlock_irqrestore(&up->port.lock, flags);
631 static unsigned int m32r_sio_get_mctrl(struct uart_port *port)
636 static void m32r_sio_set_mctrl(struct uart_port *port, unsigned int mctrl)
641 static void m32r_sio_break_ctl(struct uart_port *port, int break_state)
646 static int m32r_sio_startup(struct uart_port *port)
648 struct uart_sio_port *up = (struct uart_sio_port *)port;
654 * If the "interrupt" for this port doesn't correspond with any
655 * hardware interrupt, we use a timer-based system. The original
656 * driver used to do this with IRQ0.
658 if (!is_real_interrupt(up->port.irq)) {
659 unsigned int timeout = up->port.timeout;
661 timeout = timeout > 6 ? (timeout / 2 - 2) : 1;
663 up->timer.data = (unsigned long)up;
664 mod_timer(&up->timer, jiffies + timeout);
666 retval = serial_link_irq_chain(up);
672 * Finally, enable interrupts. Note: Modem status interrupts
673 * are set via set_termios(), which will be occurring imminently
674 * anyway, so we don't enable them here.
676 * - M32R_PLDSIO: 0x04
678 up->ier = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
679 sio_out(up, SIOTRCR, up->ier);
682 * And clear the interrupt registers again for luck.
689 static void m32r_sio_shutdown(struct uart_port *port)
691 struct uart_sio_port *up = (struct uart_sio_port *)port;
694 * Disable interrupts from this port
697 sio_out(up, SIOTRCR, 0);
700 * Disable break condition and FIFOs
705 if (!is_real_interrupt(up->port.irq))
706 del_timer_sync(&up->timer);
708 serial_unlink_irq_chain(up);
711 static unsigned int m32r_sio_get_divisor(struct uart_port *port,
714 return uart_get_divisor(port, baud);
717 static void m32r_sio_set_termios(struct uart_port *port,
718 struct termios *termios, struct termios *old)
720 struct uart_sio_port *up = (struct uart_sio_port *)port;
721 unsigned char cval = 0;
723 unsigned int baud, quot;
725 switch (termios->c_cflag & CSIZE) {
727 cval = UART_LCR_WLEN5;
730 cval = UART_LCR_WLEN6;
733 cval = UART_LCR_WLEN7;
737 cval = UART_LCR_WLEN8;
741 if (termios->c_cflag & CSTOPB)
742 cval |= UART_LCR_STOP;
743 if (termios->c_cflag & PARENB)
744 cval |= UART_LCR_PARITY;
745 if (!(termios->c_cflag & PARODD))
746 cval |= UART_LCR_EPAR;
748 if (termios->c_cflag & CMSPAR)
749 cval |= UART_LCR_SPAR;
753 * Ask the core to calculate the divisor for us.
755 #ifdef CONFIG_SERIAL_M32R_PLDSIO
756 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/4);
758 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
760 quot = m32r_sio_get_divisor(port, baud);
763 * Ok, we're now changing the port state. Do it with
764 * interrupts disabled.
766 spin_lock_irqsave(&up->port.lock, flags);
768 sio_set_baud_rate(baud);
771 * Update the per-port timeout.
773 uart_update_timeout(port, termios->c_cflag, baud);
775 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
776 if (termios->c_iflag & INPCK)
777 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
778 if (termios->c_iflag & (BRKINT | PARMRK))
779 up->port.read_status_mask |= UART_LSR_BI;
782 * Characteres to ignore
784 up->port.ignore_status_mask = 0;
785 if (termios->c_iflag & IGNPAR)
786 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
787 if (termios->c_iflag & IGNBRK) {
788 up->port.ignore_status_mask |= UART_LSR_BI;
790 * If we're ignoring parity and break indicators,
791 * ignore overruns too (for real raw support).
793 if (termios->c_iflag & IGNPAR)
794 up->port.ignore_status_mask |= UART_LSR_OE;
798 * ignore all characters if CREAD is not set
800 if ((termios->c_cflag & CREAD) == 0)
801 up->port.ignore_status_mask |= UART_LSR_DR;
804 * CTS flow control flag and modem status interrupts
806 up->ier &= ~UART_IER_MSI;
807 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
808 up->ier |= UART_IER_MSI;
810 serial_out(up, UART_IER, up->ier);
812 up->lcr = cval; /* Save LCR */
813 spin_unlock_irqrestore(&up->port.lock, flags);
816 static void m32r_sio_pm(struct uart_port *port, unsigned int state,
817 unsigned int oldstate)
819 struct uart_sio_port *up = (struct uart_sio_port *)port;
822 up->pm(port, state, oldstate);
826 * Resource handling. This is complicated by the fact that resources
827 * depend on the port type. Maybe we should be claiming the standard
828 * 8250 ports, and then trying to get other resources as necessary?
831 m32r_sio_request_std_resource(struct uart_sio_port *up, struct resource **res)
833 unsigned int size = 8 << up->port.regshift;
834 #ifndef CONFIG_SERIAL_M32R_PLDSIO
839 switch (up->port.iotype) {
841 if (up->port.mapbase) {
842 #ifdef CONFIG_SERIAL_M32R_PLDSIO
843 *res = request_mem_region(up->port.mapbase, size, "serial");
845 start = up->port.mapbase;
846 *res = request_mem_region(start, size, "serial");
854 *res = request_region(up->port.iobase, size, "serial");
862 static void m32r_sio_release_port(struct uart_port *port)
864 struct uart_sio_port *up = (struct uart_sio_port *)port;
865 unsigned long start, offset = 0, size = 0;
867 size <<= up->port.regshift;
869 switch (up->port.iotype) {
871 if (up->port.mapbase) {
875 iounmap(up->port.membase);
876 up->port.membase = NULL;
878 start = up->port.mapbase;
881 release_mem_region(start + offset, size);
882 release_mem_region(start, 8 << up->port.regshift);
887 start = up->port.iobase;
890 release_region(start + offset, size);
891 release_region(start + offset, 8 << up->port.regshift);
899 static int m32r_sio_request_port(struct uart_port *port)
901 struct uart_sio_port *up = (struct uart_sio_port *)port;
902 struct resource *res = NULL;
905 ret = m32r_sio_request_std_resource(up, &res);
908 * If we have a mapbase, then request that as well.
910 if (ret == 0 && up->port.flags & UPF_IOREMAP) {
911 int size = res->end - res->start + 1;
913 up->port.membase = ioremap(up->port.mapbase, size);
914 if (!up->port.membase)
920 release_resource(res);
926 static void m32r_sio_config_port(struct uart_port *port, int flags)
928 struct uart_sio_port *up = (struct uart_sio_port *)port;
930 spin_lock_irqsave(&up->port.lock, flags);
932 up->port.type = (PORT_M32R_SIO - PORT_M32R_BASE + 1);
933 up->port.fifosize = uart_config[up->port.type].dfl_xmit_fifo_size;
935 spin_unlock_irqrestore(&up->port.lock, flags);
939 m32r_sio_verify_port(struct uart_port *port, struct serial_struct *ser)
941 if (ser->irq >= NR_IRQS || ser->irq < 0 ||
942 ser->baud_base < 9600 || ser->type < PORT_UNKNOWN ||
943 ser->type >= ARRAY_SIZE(uart_config))
949 m32r_sio_type(struct uart_port *port)
951 int type = port->type;
953 if (type >= ARRAY_SIZE(uart_config))
955 return uart_config[type].name;
958 static struct uart_ops m32r_sio_pops = {
959 .tx_empty = m32r_sio_tx_empty,
960 .set_mctrl = m32r_sio_set_mctrl,
961 .get_mctrl = m32r_sio_get_mctrl,
962 .stop_tx = m32r_sio_stop_tx,
963 .start_tx = m32r_sio_start_tx,
964 .stop_rx = m32r_sio_stop_rx,
965 .enable_ms = m32r_sio_enable_ms,
966 .break_ctl = m32r_sio_break_ctl,
967 .startup = m32r_sio_startup,
968 .shutdown = m32r_sio_shutdown,
969 .set_termios = m32r_sio_set_termios,
971 .type = m32r_sio_type,
972 .release_port = m32r_sio_release_port,
973 .request_port = m32r_sio_request_port,
974 .config_port = m32r_sio_config_port,
975 .verify_port = m32r_sio_verify_port,
978 static struct uart_sio_port m32r_sio_ports[UART_NR];
980 static void __init m32r_sio_init_ports(void)
982 struct uart_sio_port *up;
983 static int first = 1;
990 for (i = 0, up = m32r_sio_ports; i < ARRAY_SIZE(old_serial_port);
992 up->port.iobase = old_serial_port[i].port;
993 up->port.irq = irq_canonicalize(old_serial_port[i].irq);
994 up->port.uartclk = old_serial_port[i].baud_base * 16;
995 up->port.flags = old_serial_port[i].flags;
996 up->port.membase = old_serial_port[i].iomem_base;
997 up->port.iotype = old_serial_port[i].io_type;
998 up->port.regshift = old_serial_port[i].iomem_reg_shift;
999 up->port.ops = &m32r_sio_pops;
1003 static void __init m32r_sio_register_ports(struct uart_driver *drv)
1007 m32r_sio_init_ports();
1009 for (i = 0; i < UART_NR; i++) {
1010 struct uart_sio_port *up = &m32r_sio_ports[i];
1013 up->port.ops = &m32r_sio_pops;
1014 init_timer(&up->timer);
1015 up->timer.function = m32r_sio_timeout;
1018 * ALPHA_KLUDGE_MCR needs to be killed.
1020 up->mcr_mask = ~ALPHA_KLUDGE_MCR;
1021 up->mcr_force = ALPHA_KLUDGE_MCR;
1023 uart_add_one_port(drv, &up->port);
1027 #ifdef CONFIG_SERIAL_M32R_SIO_CONSOLE
1030 * Wait for transmitter & holding register to empty
1032 static inline void wait_for_xmitr(struct uart_sio_port *up)
1034 unsigned int status, tmout = 10000;
1036 /* Wait up to 10ms for the character(s) to be sent. */
1038 status = sio_in(up, SIOSTS);
1043 } while ((status & UART_EMPTY) != UART_EMPTY);
1045 /* Wait up to 1s for flow control if necessary */
1046 if (up->port.flags & UPF_CONS_FLOW) {
1054 * Print a string to the serial port trying not to disturb
1055 * any possible real use of the port...
1057 * The console_lock must be held when we get here.
1059 static void m32r_sio_console_write(struct console *co, const char *s,
1062 struct uart_sio_port *up = &m32r_sio_ports[co->index];
1067 * First save the UER then disable the interrupts
1069 ier = sio_in(up, SIOTRCR);
1070 sio_out(up, SIOTRCR, 0);
1073 * Now, do each character
1075 for (i = 0; i < count; i++, s++) {
1079 * Send the character out.
1080 * If a LF, also do CR...
1082 sio_out(up, SIOTXB, *s);
1086 sio_out(up, SIOTXB, 13);
1091 * Finally, wait for transmitter to become empty
1092 * and restore the IER
1095 sio_out(up, SIOTRCR, ier);
1098 static int __init m32r_sio_console_setup(struct console *co, char *options)
1100 struct uart_port *port;
1107 * Check whether an invalid uart number has been specified, and
1108 * if so, search for the first available port that does have
1111 if (co->index >= UART_NR)
1113 port = &m32r_sio_ports[co->index].port;
1118 spin_lock_init(&port->lock);
1121 uart_parse_options(options, &baud, &parity, &bits, &flow);
1123 return uart_set_options(port, co, baud, parity, bits, flow);
1126 static struct uart_driver m32r_sio_reg;
1127 static struct console m32r_sio_console = {
1129 .write = m32r_sio_console_write,
1130 .device = uart_console_device,
1131 .setup = m32r_sio_console_setup,
1132 .flags = CON_PRINTBUFFER,
1134 .data = &m32r_sio_reg,
1137 static int __init m32r_sio_console_init(void)
1141 m32r_sio_init_ports();
1142 register_console(&m32r_sio_console);
1145 console_initcall(m32r_sio_console_init);
1147 #define M32R_SIO_CONSOLE &m32r_sio_console
1149 #define M32R_SIO_CONSOLE NULL
1152 static struct uart_driver m32r_sio_reg = {
1153 .owner = THIS_MODULE,
1154 .driver_name = "sio",
1155 .devfs_name = "tts/",
1160 .cons = M32R_SIO_CONSOLE,
1164 * m32r_sio_suspend_port - suspend one serial port
1165 * @line: serial line number
1167 * Suspend one serial port.
1169 void m32r_sio_suspend_port(int line)
1171 uart_suspend_port(&m32r_sio_reg, &m32r_sio_ports[line].port);
1175 * m32r_sio_resume_port - resume one serial port
1176 * @line: serial line number
1178 * Resume one serial port.
1180 void m32r_sio_resume_port(int line)
1182 uart_resume_port(&m32r_sio_reg, &m32r_sio_ports[line].port);
1185 static int __init m32r_sio_init(void)
1189 printk(KERN_INFO "Serial: M32R SIO driver $Revision: 1.11 $ ");
1191 for (i = 0; i < NR_IRQS; i++)
1192 spin_lock_init(&irq_lists[i].lock);
1194 ret = uart_register_driver(&m32r_sio_reg);
1196 m32r_sio_register_ports(&m32r_sio_reg);
1201 static void __exit m32r_sio_exit(void)
1205 for (i = 0; i < UART_NR; i++)
1206 uart_remove_one_port(&m32r_sio_reg, &m32r_sio_ports[i].port);
1208 uart_unregister_driver(&m32r_sio_reg);
1211 module_init(m32r_sio_init);
1212 module_exit(m32r_sio_exit);
1214 EXPORT_SYMBOL(m32r_sio_suspend_port);
1215 EXPORT_SYMBOL(m32r_sio_resume_port);
1217 MODULE_LICENSE("GPL");
1218 MODULE_DESCRIPTION("Generic M32R SIO serial driver $Revision: 1.11 $");