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 (UPF_BOOT_AUTOCONF | UPF_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)
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)
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;
338 ch = sio_in(up, SIORXB);
340 up->port.icount.rx++;
342 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
343 UART_LSR_FE | UART_LSR_OE))) {
345 * For statistics only
347 if (*status & UART_LSR_BI) {
348 *status &= ~(UART_LSR_FE | UART_LSR_PE);
349 up->port.icount.brk++;
351 * We do the SysRQ and SAK checking
352 * here because otherwise the break
353 * may get masked by ignore_status_mask
354 * or read_status_mask.
356 if (uart_handle_break(&up->port))
358 } else if (*status & UART_LSR_PE)
359 up->port.icount.parity++;
360 else if (*status & UART_LSR_FE)
361 up->port.icount.frame++;
362 if (*status & UART_LSR_OE)
363 up->port.icount.overrun++;
366 * Mask off conditions which should be ingored.
368 *status &= up->port.read_status_mask;
370 if (up->port.line == up->port.cons->index) {
371 /* Recover the break flag from console xmit */
372 *status |= up->lsr_break_flag;
373 up->lsr_break_flag = 0;
376 if (*status & UART_LSR_BI) {
377 DEBUG_INTR("handling break....");
379 } else if (*status & UART_LSR_PE)
381 else if (*status & UART_LSR_FE)
384 if (uart_handle_sysrq_char(&up->port, ch, regs))
386 if ((*status & up->port.ignore_status_mask) == 0)
387 tty_insert_flip_char(tty, ch, flag);
389 if (*status & UART_LSR_OE) {
391 * Overrun is special, since it's reported
392 * immediately, and doesn't affect the current
395 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
398 *status = serial_in(up, UART_LSR);
399 } while ((*status & UART_LSR_DR) && (max_count-- > 0));
400 tty_flip_buffer_push(tty);
403 static _INLINE_ void transmit_chars(struct uart_sio_port *up)
405 struct circ_buf *xmit = &up->port.info->xmit;
408 if (up->port.x_char) {
409 #ifndef CONFIG_SERIAL_M32R_PLDSIO /* XXX */
410 serial_out(up, UART_TX, up->port.x_char);
412 up->port.icount.tx++;
416 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
417 m32r_sio_stop_tx(&up->port);
421 count = up->port.fifosize;
423 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
424 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
425 up->port.icount.tx++;
426 if (uart_circ_empty(xmit))
428 while (!serial_in(up, UART_LSR) & UART_LSR_THRE);
430 } while (--count > 0);
432 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
433 uart_write_wakeup(&up->port);
435 DEBUG_INTR("THRE...");
437 if (uart_circ_empty(xmit))
438 m32r_sio_stop_tx(&up->port);
442 * This handles the interrupt from one port.
444 static inline void m32r_sio_handle_port(struct uart_sio_port *up,
445 unsigned int status, struct pt_regs *regs)
447 DEBUG_INTR("status = %x...", status);
450 receive_chars(up, &status, regs);
456 * This is the serial driver's interrupt routine.
458 * Arjan thinks the old way was overly complex, so it got simplified.
459 * Alan disagrees, saying that need the complexity to handle the weird
460 * nature of ISA shared interrupts. (This is a special exception.)
462 * In order to handle ISA shared interrupts properly, we need to check
463 * that all ports have been serviced, and therefore the ISA interrupt
464 * line has been de-asserted.
466 * This means we need to loop through all ports. checking that they
467 * don't have an interrupt pending.
469 static irqreturn_t m32r_sio_interrupt(int irq, void *dev_id,
470 struct pt_regs *regs)
472 struct irq_info *i = dev_id;
473 struct list_head *l, *end = NULL;
474 int pass_counter = 0;
476 DEBUG_INTR("m32r_sio_interrupt(%d)...", irq);
478 #ifdef CONFIG_SERIAL_M32R_PLDSIO
479 // if (irq == PLD_IRQ_SIO0_SND)
480 // irq = PLD_IRQ_SIO0_RCV;
482 if (irq == M32R_IRQ_SIO0_S)
483 irq = M32R_IRQ_SIO0_R;
490 struct uart_sio_port *up;
493 up = list_entry(l, struct uart_sio_port, list);
495 sts = sio_in(up, SIOSTS);
497 spin_lock(&up->port.lock);
498 m32r_sio_handle_port(up, sts, regs);
499 spin_unlock(&up->port.lock);
502 } else if (end == NULL)
507 if (l == i->head && pass_counter++ > PASS_LIMIT) {
514 spin_unlock(&i->lock);
516 DEBUG_INTR("end.\n");
522 * To support ISA shared interrupts, we need to have one interrupt
523 * handler that ensures that the IRQ line has been deasserted
524 * before returning. Failing to do this will result in the IRQ
525 * line being stuck active, and, since ISA irqs are edge triggered,
526 * no more IRQs will be seen.
528 static void serial_do_unlink(struct irq_info *i, struct uart_sio_port *up)
530 spin_lock_irq(&i->lock);
532 if (!list_empty(i->head)) {
533 if (i->head == &up->list)
534 i->head = i->head->next;
537 BUG_ON(i->head != &up->list);
541 spin_unlock_irq(&i->lock);
544 static int serial_link_irq_chain(struct uart_sio_port *up)
546 struct irq_info *i = irq_lists + up->port.irq;
547 int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? SA_SHIRQ : 0;
549 spin_lock_irq(&i->lock);
552 list_add(&up->list, i->head);
553 spin_unlock_irq(&i->lock);
557 INIT_LIST_HEAD(&up->list);
559 spin_unlock_irq(&i->lock);
561 ret = request_irq(up->port.irq, m32r_sio_interrupt,
562 irq_flags, "SIO0-RX", i);
563 ret |= request_irq(up->port.irq + 1, m32r_sio_interrupt,
564 irq_flags, "SIO0-TX", i);
566 serial_do_unlink(i, up);
572 static void serial_unlink_irq_chain(struct uart_sio_port *up)
574 struct irq_info *i = irq_lists + up->port.irq;
576 BUG_ON(i->head == NULL);
578 if (list_empty(i->head)) {
579 free_irq(up->port.irq, i);
580 free_irq(up->port.irq + 1, i);
583 serial_do_unlink(i, up);
587 * This function is used to handle ports that do not have an interrupt.
589 static void m32r_sio_timeout(unsigned long data)
591 struct uart_sio_port *up = (struct uart_sio_port *)data;
592 unsigned int timeout;
595 sts = sio_in(up, SIOSTS);
597 spin_lock(&up->port.lock);
598 m32r_sio_handle_port(up, sts, NULL);
599 spin_unlock(&up->port.lock);
602 timeout = up->port.timeout;
603 timeout = timeout > 6 ? (timeout / 2 - 2) : 1;
604 mod_timer(&up->timer, jiffies + timeout);
607 static unsigned int m32r_sio_tx_empty(struct uart_port *port)
609 struct uart_sio_port *up = (struct uart_sio_port *)port;
613 spin_lock_irqsave(&up->port.lock, flags);
614 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
615 spin_unlock_irqrestore(&up->port.lock, flags);
620 static unsigned int m32r_sio_get_mctrl(struct uart_port *port)
625 static void m32r_sio_set_mctrl(struct uart_port *port, unsigned int mctrl)
630 static void m32r_sio_break_ctl(struct uart_port *port, int break_state)
635 static int m32r_sio_startup(struct uart_port *port)
637 struct uart_sio_port *up = (struct uart_sio_port *)port;
643 * If the "interrupt" for this port doesn't correspond with any
644 * hardware interrupt, we use a timer-based system. The original
645 * driver used to do this with IRQ0.
647 if (!is_real_interrupt(up->port.irq)) {
648 unsigned int timeout = up->port.timeout;
650 timeout = timeout > 6 ? (timeout / 2 - 2) : 1;
652 up->timer.data = (unsigned long)up;
653 mod_timer(&up->timer, jiffies + timeout);
655 retval = serial_link_irq_chain(up);
661 * Finally, enable interrupts. Note: Modem status interrupts
662 * are set via set_termios(), which will be occurring imminently
663 * anyway, so we don't enable them here.
665 * - M32R_PLDSIO: 0x04
667 up->ier = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
668 sio_out(up, SIOTRCR, up->ier);
671 * And clear the interrupt registers again for luck.
678 static void m32r_sio_shutdown(struct uart_port *port)
680 struct uart_sio_port *up = (struct uart_sio_port *)port;
683 * Disable interrupts from this port
686 sio_out(up, SIOTRCR, 0);
689 * Disable break condition and FIFOs
694 if (!is_real_interrupt(up->port.irq))
695 del_timer_sync(&up->timer);
697 serial_unlink_irq_chain(up);
700 static unsigned int m32r_sio_get_divisor(struct uart_port *port,
703 return uart_get_divisor(port, baud);
706 static void m32r_sio_set_termios(struct uart_port *port,
707 struct termios *termios, struct termios *old)
709 struct uart_sio_port *up = (struct uart_sio_port *)port;
710 unsigned char cval = 0;
712 unsigned int baud, quot;
714 switch (termios->c_cflag & CSIZE) {
716 cval = UART_LCR_WLEN5;
719 cval = UART_LCR_WLEN6;
722 cval = UART_LCR_WLEN7;
726 cval = UART_LCR_WLEN8;
730 if (termios->c_cflag & CSTOPB)
731 cval |= UART_LCR_STOP;
732 if (termios->c_cflag & PARENB)
733 cval |= UART_LCR_PARITY;
734 if (!(termios->c_cflag & PARODD))
735 cval |= UART_LCR_EPAR;
737 if (termios->c_cflag & CMSPAR)
738 cval |= UART_LCR_SPAR;
742 * Ask the core to calculate the divisor for us.
744 #ifdef CONFIG_SERIAL_M32R_PLDSIO
745 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/4);
747 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
749 quot = m32r_sio_get_divisor(port, baud);
752 * Ok, we're now changing the port state. Do it with
753 * interrupts disabled.
755 spin_lock_irqsave(&up->port.lock, flags);
757 sio_set_baud_rate(baud);
760 * Update the per-port timeout.
762 uart_update_timeout(port, termios->c_cflag, baud);
764 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
765 if (termios->c_iflag & INPCK)
766 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
767 if (termios->c_iflag & (BRKINT | PARMRK))
768 up->port.read_status_mask |= UART_LSR_BI;
771 * Characteres to ignore
773 up->port.ignore_status_mask = 0;
774 if (termios->c_iflag & IGNPAR)
775 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
776 if (termios->c_iflag & IGNBRK) {
777 up->port.ignore_status_mask |= UART_LSR_BI;
779 * If we're ignoring parity and break indicators,
780 * ignore overruns too (for real raw support).
782 if (termios->c_iflag & IGNPAR)
783 up->port.ignore_status_mask |= UART_LSR_OE;
787 * ignore all characters if CREAD is not set
789 if ((termios->c_cflag & CREAD) == 0)
790 up->port.ignore_status_mask |= UART_LSR_DR;
793 * CTS flow control flag and modem status interrupts
795 up->ier &= ~UART_IER_MSI;
796 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
797 up->ier |= UART_IER_MSI;
799 serial_out(up, UART_IER, up->ier);
801 up->lcr = cval; /* Save LCR */
802 spin_unlock_irqrestore(&up->port.lock, flags);
805 static void m32r_sio_pm(struct uart_port *port, unsigned int state,
806 unsigned int oldstate)
808 struct uart_sio_port *up = (struct uart_sio_port *)port;
811 up->pm(port, state, oldstate);
815 * Resource handling. This is complicated by the fact that resources
816 * depend on the port type. Maybe we should be claiming the standard
817 * 8250 ports, and then trying to get other resources as necessary?
820 m32r_sio_request_std_resource(struct uart_sio_port *up, struct resource **res)
822 unsigned int size = 8 << up->port.regshift;
823 #ifndef CONFIG_SERIAL_M32R_PLDSIO
828 switch (up->port.iotype) {
830 if (up->port.mapbase) {
831 #ifdef CONFIG_SERIAL_M32R_PLDSIO
832 *res = request_mem_region(up->port.mapbase, size, "serial");
834 start = up->port.mapbase;
835 *res = request_mem_region(start, size, "serial");
843 *res = request_region(up->port.iobase, size, "serial");
851 static void m32r_sio_release_port(struct uart_port *port)
853 struct uart_sio_port *up = (struct uart_sio_port *)port;
854 unsigned long start, offset = 0, size = 0;
856 size <<= up->port.regshift;
858 switch (up->port.iotype) {
860 if (up->port.mapbase) {
864 iounmap(up->port.membase);
865 up->port.membase = NULL;
867 start = up->port.mapbase;
870 release_mem_region(start + offset, size);
871 release_mem_region(start, 8 << up->port.regshift);
876 start = up->port.iobase;
879 release_region(start + offset, size);
880 release_region(start + offset, 8 << up->port.regshift);
888 static int m32r_sio_request_port(struct uart_port *port)
890 struct uart_sio_port *up = (struct uart_sio_port *)port;
891 struct resource *res = NULL;
894 ret = m32r_sio_request_std_resource(up, &res);
897 * If we have a mapbase, then request that as well.
899 if (ret == 0 && up->port.flags & UPF_IOREMAP) {
900 int size = res->end - res->start + 1;
902 up->port.membase = ioremap(up->port.mapbase, size);
903 if (!up->port.membase)
909 release_resource(res);
915 static void m32r_sio_config_port(struct uart_port *port, int flags)
917 struct uart_sio_port *up = (struct uart_sio_port *)port;
919 spin_lock_irqsave(&up->port.lock, flags);
921 up->port.type = (PORT_M32R_SIO - PORT_M32R_BASE + 1);
922 up->port.fifosize = uart_config[up->port.type].dfl_xmit_fifo_size;
924 spin_unlock_irqrestore(&up->port.lock, flags);
928 m32r_sio_verify_port(struct uart_port *port, struct serial_struct *ser)
930 if (ser->irq >= NR_IRQS || ser->irq < 0 ||
931 ser->baud_base < 9600 || ser->type < PORT_UNKNOWN ||
932 ser->type >= ARRAY_SIZE(uart_config))
938 m32r_sio_type(struct uart_port *port)
940 int type = port->type;
942 if (type >= ARRAY_SIZE(uart_config))
944 return uart_config[type].name;
947 static struct uart_ops m32r_sio_pops = {
948 .tx_empty = m32r_sio_tx_empty,
949 .set_mctrl = m32r_sio_set_mctrl,
950 .get_mctrl = m32r_sio_get_mctrl,
951 .stop_tx = m32r_sio_stop_tx,
952 .start_tx = m32r_sio_start_tx,
953 .stop_rx = m32r_sio_stop_rx,
954 .enable_ms = m32r_sio_enable_ms,
955 .break_ctl = m32r_sio_break_ctl,
956 .startup = m32r_sio_startup,
957 .shutdown = m32r_sio_shutdown,
958 .set_termios = m32r_sio_set_termios,
960 .type = m32r_sio_type,
961 .release_port = m32r_sio_release_port,
962 .request_port = m32r_sio_request_port,
963 .config_port = m32r_sio_config_port,
964 .verify_port = m32r_sio_verify_port,
967 static struct uart_sio_port m32r_sio_ports[UART_NR];
969 static void __init m32r_sio_init_ports(void)
971 struct uart_sio_port *up;
972 static int first = 1;
979 for (i = 0, up = m32r_sio_ports; i < ARRAY_SIZE(old_serial_port);
981 up->port.iobase = old_serial_port[i].port;
982 up->port.irq = irq_canonicalize(old_serial_port[i].irq);
983 up->port.uartclk = old_serial_port[i].baud_base * 16;
984 up->port.flags = old_serial_port[i].flags;
985 up->port.membase = old_serial_port[i].iomem_base;
986 up->port.iotype = old_serial_port[i].io_type;
987 up->port.regshift = old_serial_port[i].iomem_reg_shift;
988 up->port.ops = &m32r_sio_pops;
992 static void __init m32r_sio_register_ports(struct uart_driver *drv)
996 m32r_sio_init_ports();
998 for (i = 0; i < UART_NR; i++) {
999 struct uart_sio_port *up = &m32r_sio_ports[i];
1002 up->port.ops = &m32r_sio_pops;
1003 init_timer(&up->timer);
1004 up->timer.function = m32r_sio_timeout;
1007 * ALPHA_KLUDGE_MCR needs to be killed.
1009 up->mcr_mask = ~ALPHA_KLUDGE_MCR;
1010 up->mcr_force = ALPHA_KLUDGE_MCR;
1012 uart_add_one_port(drv, &up->port);
1016 #ifdef CONFIG_SERIAL_M32R_SIO_CONSOLE
1019 * Wait for transmitter & holding register to empty
1021 static inline void wait_for_xmitr(struct uart_sio_port *up)
1023 unsigned int status, tmout = 10000;
1025 /* Wait up to 10ms for the character(s) to be sent. */
1027 status = sio_in(up, SIOSTS);
1032 } while ((status & UART_EMPTY) != UART_EMPTY);
1034 /* Wait up to 1s for flow control if necessary */
1035 if (up->port.flags & UPF_CONS_FLOW) {
1043 * Print a string to the serial port trying not to disturb
1044 * any possible real use of the port...
1046 * The console_lock must be held when we get here.
1048 static void m32r_sio_console_write(struct console *co, const char *s,
1051 struct uart_sio_port *up = &m32r_sio_ports[co->index];
1056 * First save the UER then disable the interrupts
1058 ier = sio_in(up, SIOTRCR);
1059 sio_out(up, SIOTRCR, 0);
1062 * Now, do each character
1064 for (i = 0; i < count; i++, s++) {
1068 * Send the character out.
1069 * If a LF, also do CR...
1071 sio_out(up, SIOTXB, *s);
1075 sio_out(up, SIOTXB, 13);
1080 * Finally, wait for transmitter to become empty
1081 * and restore the IER
1084 sio_out(up, SIOTRCR, ier);
1087 static int __init m32r_sio_console_setup(struct console *co, char *options)
1089 struct uart_port *port;
1096 * Check whether an invalid uart number has been specified, and
1097 * if so, search for the first available port that does have
1100 if (co->index >= UART_NR)
1102 port = &m32r_sio_ports[co->index].port;
1107 spin_lock_init(&port->lock);
1110 uart_parse_options(options, &baud, &parity, &bits, &flow);
1112 return uart_set_options(port, co, baud, parity, bits, flow);
1115 static struct uart_driver m32r_sio_reg;
1116 static struct console m32r_sio_console = {
1118 .write = m32r_sio_console_write,
1119 .device = uart_console_device,
1120 .setup = m32r_sio_console_setup,
1121 .flags = CON_PRINTBUFFER,
1123 .data = &m32r_sio_reg,
1126 static int __init m32r_sio_console_init(void)
1130 m32r_sio_init_ports();
1131 register_console(&m32r_sio_console);
1134 console_initcall(m32r_sio_console_init);
1136 #define M32R_SIO_CONSOLE &m32r_sio_console
1138 #define M32R_SIO_CONSOLE NULL
1141 static struct uart_driver m32r_sio_reg = {
1142 .owner = THIS_MODULE,
1143 .driver_name = "sio",
1144 .devfs_name = "tts/",
1149 .cons = M32R_SIO_CONSOLE,
1153 * m32r_sio_suspend_port - suspend one serial port
1154 * @line: serial line number
1156 * Suspend one serial port.
1158 void m32r_sio_suspend_port(int line)
1160 uart_suspend_port(&m32r_sio_reg, &m32r_sio_ports[line].port);
1164 * m32r_sio_resume_port - resume one serial port
1165 * @line: serial line number
1167 * Resume one serial port.
1169 void m32r_sio_resume_port(int line)
1171 uart_resume_port(&m32r_sio_reg, &m32r_sio_ports[line].port);
1174 static int __init m32r_sio_init(void)
1178 printk(KERN_INFO "Serial: M32R SIO driver $Revision: 1.11 $ ");
1180 for (i = 0; i < NR_IRQS; i++)
1181 spin_lock_init(&irq_lists[i].lock);
1183 ret = uart_register_driver(&m32r_sio_reg);
1185 m32r_sio_register_ports(&m32r_sio_reg);
1190 static void __exit m32r_sio_exit(void)
1194 for (i = 0; i < UART_NR; i++)
1195 uart_remove_one_port(&m32r_sio_reg, &m32r_sio_ports[i].port);
1197 uart_unregister_driver(&m32r_sio_reg);
1200 module_init(m32r_sio_init);
1201 module_exit(m32r_sio_exit);
1203 EXPORT_SYMBOL(m32r_sio_suspend_port);
1204 EXPORT_SYMBOL(m32r_sio_resume_port);
1206 MODULE_LICENSE("GPL");
1207 MODULE_DESCRIPTION("Generic M32R SIO serial driver $Revision: 1.11 $");