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.
29 #if defined(CONFIG_SERIAL_M32R_SIO_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
33 #include <linux/module.h>
34 #include <linux/tty.h>
35 #include <linux/ioport.h>
36 #include <linux/init.h>
37 #include <linux/console.h>
38 #include <linux/sysrq.h>
39 #include <linux/serial.h>
40 #include <linux/serialP.h>
41 #include <linux/delay.h>
47 #define PORT_M32R_BASE PORT_M32R_SIO
48 #define PORT_INDEX(x) (x - PORT_M32R_BASE + 1)
49 #define BAUD_RATE 115200
51 #include <linux/serial_core.h>
53 #include "m32r_sio_reg.h"
59 #define DEBUG_AUTOCONF(fmt...) printk(fmt)
61 #define DEBUG_AUTOCONF(fmt...) do { } while (0)
65 #define DEBUG_INTR(fmt...) printk(fmt)
67 #define DEBUG_INTR(fmt...) do { } while (0)
70 #define PASS_LIMIT 256
73 * We default to IRQ0 for the "no irq" hack. Some
74 * machine types want others as well - they're free
75 * to redefine this in their header file.
77 #define is_real_interrupt(irq) ((irq) != 0)
79 #define BASE_BAUD 115200
81 /* Standard COM flags */
82 #define STD_COM_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST)
85 * SERIAL_PORT_DFNS tells us about built-in ports that have no
86 * standard enumeration mechanism. Platforms that can find all
87 * serial ports via mechanisms like ACPI or PCI need not supply it.
89 #if defined(CONFIG_PLAT_USRV)
91 #define SERIAL_PORT_DFNS \
92 /* UART CLK PORT IRQ FLAGS */ \
93 { 0, BASE_BAUD, 0x3F8, PLD_IRQ_UART0, STD_COM_FLAGS }, /* ttyS0 */ \
94 { 0, BASE_BAUD, 0x2F8, PLD_IRQ_UART1, STD_COM_FLAGS }, /* ttyS1 */
96 #else /* !CONFIG_PLAT_USRV */
98 #if defined(CONFIG_SERIAL_M32R_PLDSIO)
99 #define SERIAL_PORT_DFNS \
100 { 0, BASE_BAUD, ((unsigned long)PLD_ESIO0CR), PLD_IRQ_SIO0_RCV, \
101 STD_COM_FLAGS }, /* ttyS0 */
103 #define SERIAL_PORT_DFNS \
104 { 0, BASE_BAUD, M32R_SIO_OFFSET, M32R_IRQ_SIO0_R, \
105 STD_COM_FLAGS }, /* ttyS0 */
108 #endif /* !CONFIG_PLAT_USRV */
110 static struct old_serial_port old_serial_port[] = {
114 #define UART_NR ARRAY_SIZE(old_serial_port)
116 struct uart_sio_port {
117 struct uart_port port;
118 struct timer_list timer; /* "no irq" timer */
119 struct list_head list; /* ports on this IRQ */
124 unsigned char mcr_mask; /* mask of user bits */
125 unsigned char mcr_force; /* mask of forced bits */
126 unsigned char lsr_break_flag;
129 * We provide a per-port pm hook.
131 void (*pm)(struct uart_port *port,
132 unsigned int state, unsigned int old);
137 struct list_head *head;
140 static struct irq_info irq_lists[NR_IRQS];
143 * Here we define the default xmit fifo size used for each type of UART.
145 static const struct serial_uart_config uart_config[] = {
148 .dfl_xmit_fifo_size = 1,
151 [PORT_INDEX(PORT_M32R_SIO)] = {
153 .dfl_xmit_fifo_size = 1,
158 #ifdef CONFIG_SERIAL_M32R_PLDSIO
160 #define __sio_in(x) inw((unsigned long)(x))
161 #define __sio_out(v,x) outw((v),(unsigned long)(x))
163 static inline void sio_set_baud_rate(unsigned long baud)
165 unsigned short sbaud;
166 sbaud = (boot_cpu_data.bus_clock / (baud * 4))-1;
167 __sio_out(sbaud, PLD_ESIO0BAUR);
170 static void sio_reset(void)
174 tmp = __sio_in(PLD_ESIO0RXB);
175 tmp = __sio_in(PLD_ESIO0RXB);
176 tmp = __sio_in(PLD_ESIO0CR);
177 sio_set_baud_rate(BAUD_RATE);
178 __sio_out(0x0300, PLD_ESIO0CR);
179 __sio_out(0x0003, PLD_ESIO0CR);
182 static void sio_init(void)
186 tmp = __sio_in(PLD_ESIO0RXB);
187 tmp = __sio_in(PLD_ESIO0RXB);
188 tmp = __sio_in(PLD_ESIO0CR);
189 __sio_out(0x0300, PLD_ESIO0CR);
190 __sio_out(0x0003, PLD_ESIO0CR);
193 static void sio_error(int *status)
195 printk("SIO0 error[%04x]\n", *status);
198 } while ((*status = __sio_in(PLD_ESIO0CR)) != 3);
201 #else /* not CONFIG_SERIAL_M32R_PLDSIO */
203 #define __sio_in(x) inl(x)
204 #define __sio_out(v,x) outl((v),(x))
206 static inline void sio_set_baud_rate(unsigned long baud)
210 i = boot_cpu_data.bus_clock / (baud * 16);
211 j = (boot_cpu_data.bus_clock - (i * baud * 16)) / baud;
215 __sio_out(i, M32R_SIO0_BAUR_PORTL);
216 __sio_out(j, M32R_SIO0_RBAUR_PORTL);
219 static void sio_reset(void)
221 __sio_out(0x00000300, M32R_SIO0_CR_PORTL); /* init status */
222 __sio_out(0x00000800, M32R_SIO0_MOD1_PORTL); /* 8bit */
223 __sio_out(0x00000080, M32R_SIO0_MOD0_PORTL); /* 1stop non */
224 sio_set_baud_rate(BAUD_RATE);
225 __sio_out(0x00000000, M32R_SIO0_TRCR_PORTL);
226 __sio_out(0x00000003, M32R_SIO0_CR_PORTL); /* RXCEN */
229 static void sio_init(void)
233 tmp = __sio_in(M32R_SIO0_RXB_PORTL);
234 tmp = __sio_in(M32R_SIO0_RXB_PORTL);
235 tmp = __sio_in(M32R_SIO0_STS_PORTL);
236 __sio_out(0x00000003, M32R_SIO0_CR_PORTL);
239 static void sio_error(int *status)
241 printk("SIO0 error[%04x]\n", *status);
244 } while ((*status = __sio_in(M32R_SIO0_CR_PORTL)) != 3);
247 #endif /* CONFIG_SERIAL_M32R_PLDSIO */
249 static unsigned int sio_in(struct uart_sio_port *up, int offset)
251 return __sio_in(up->port.iobase + offset);
254 static void sio_out(struct uart_sio_port *up, int offset, int value)
256 __sio_out(value, up->port.iobase + offset);
259 static unsigned int serial_in(struct uart_sio_port *up, int offset)
264 return __sio_in(offset);
267 static void serial_out(struct uart_sio_port *up, int offset, int value)
272 __sio_out(value, offset);
275 static void m32r_sio_stop_tx(struct uart_port *port)
277 struct uart_sio_port *up = (struct uart_sio_port *)port;
279 if (up->ier & UART_IER_THRI) {
280 up->ier &= ~UART_IER_THRI;
281 serial_out(up, UART_IER, up->ier);
285 static void m32r_sio_start_tx(struct uart_port *port)
287 #ifdef CONFIG_SERIAL_M32R_PLDSIO
288 struct uart_sio_port *up = (struct uart_sio_port *)port;
289 struct circ_buf *xmit = &up->port.info->xmit;
291 if (!(up->ier & UART_IER_THRI)) {
292 up->ier |= UART_IER_THRI;
293 serial_out(up, UART_IER, up->ier);
294 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
295 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
296 up->port.icount.tx++;
298 while((serial_in(up, UART_LSR) & UART_EMPTY) != UART_EMPTY);
300 struct uart_sio_port *up = (struct uart_sio_port *)port;
302 if (!(up->ier & UART_IER_THRI)) {
303 up->ier |= UART_IER_THRI;
304 serial_out(up, UART_IER, up->ier);
309 static void m32r_sio_stop_rx(struct uart_port *port)
311 struct uart_sio_port *up = (struct uart_sio_port *)port;
313 up->ier &= ~UART_IER_RLSI;
314 up->port.read_status_mask &= ~UART_LSR_DR;
315 serial_out(up, UART_IER, up->ier);
318 static void m32r_sio_enable_ms(struct uart_port *port)
320 struct uart_sio_port *up = (struct uart_sio_port *)port;
322 up->ier |= UART_IER_MSI;
323 serial_out(up, UART_IER, up->ier);
326 static void receive_chars(struct uart_sio_port *up, int *status)
328 struct tty_struct *tty = up->port.info->tty;
334 ch = sio_in(up, SIORXB);
336 up->port.icount.rx++;
338 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
339 UART_LSR_FE | UART_LSR_OE))) {
341 * For statistics only
343 if (*status & UART_LSR_BI) {
344 *status &= ~(UART_LSR_FE | UART_LSR_PE);
345 up->port.icount.brk++;
347 * We do the SysRQ and SAK checking
348 * here because otherwise the break
349 * may get masked by ignore_status_mask
350 * or read_status_mask.
352 if (uart_handle_break(&up->port))
354 } else if (*status & UART_LSR_PE)
355 up->port.icount.parity++;
356 else if (*status & UART_LSR_FE)
357 up->port.icount.frame++;
358 if (*status & UART_LSR_OE)
359 up->port.icount.overrun++;
362 * Mask off conditions which should be ingored.
364 *status &= up->port.read_status_mask;
366 if (up->port.line == up->port.cons->index) {
367 /* Recover the break flag from console xmit */
368 *status |= up->lsr_break_flag;
369 up->lsr_break_flag = 0;
372 if (*status & UART_LSR_BI) {
373 DEBUG_INTR("handling break....");
375 } else if (*status & UART_LSR_PE)
377 else if (*status & UART_LSR_FE)
380 if (uart_handle_sysrq_char(&up->port, ch))
382 if ((*status & up->port.ignore_status_mask) == 0)
383 tty_insert_flip_char(tty, ch, flag);
385 if (*status & UART_LSR_OE) {
387 * Overrun is special, since it's reported
388 * immediately, and doesn't affect the current
391 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
394 *status = serial_in(up, UART_LSR);
395 } while ((*status & UART_LSR_DR) && (max_count-- > 0));
396 tty_flip_buffer_push(tty);
399 static void transmit_chars(struct uart_sio_port *up)
401 struct circ_buf *xmit = &up->port.info->xmit;
404 if (up->port.x_char) {
405 #ifndef CONFIG_SERIAL_M32R_PLDSIO /* XXX */
406 serial_out(up, UART_TX, up->port.x_char);
408 up->port.icount.tx++;
412 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
413 m32r_sio_stop_tx(&up->port);
417 count = up->port.fifosize;
419 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
420 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
421 up->port.icount.tx++;
422 if (uart_circ_empty(xmit))
424 while (!serial_in(up, UART_LSR) & UART_LSR_THRE);
426 } while (--count > 0);
428 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
429 uart_write_wakeup(&up->port);
431 DEBUG_INTR("THRE...");
433 if (uart_circ_empty(xmit))
434 m32r_sio_stop_tx(&up->port);
438 * This handles the interrupt from one port.
440 static inline void m32r_sio_handle_port(struct uart_sio_port *up,
443 DEBUG_INTR("status = %x...", status);
446 receive_chars(up, &status);
452 * This is the serial driver's interrupt routine.
454 * Arjan thinks the old way was overly complex, so it got simplified.
455 * Alan disagrees, saying that need the complexity to handle the weird
456 * nature of ISA shared interrupts. (This is a special exception.)
458 * In order to handle ISA shared interrupts properly, we need to check
459 * that all ports have been serviced, and therefore the ISA interrupt
460 * line has been de-asserted.
462 * This means we need to loop through all ports. checking that they
463 * don't have an interrupt pending.
465 static irqreturn_t m32r_sio_interrupt(int irq, void *dev_id)
467 struct irq_info *i = dev_id;
468 struct list_head *l, *end = NULL;
469 int pass_counter = 0;
471 DEBUG_INTR("m32r_sio_interrupt(%d)...", irq);
473 #ifdef CONFIG_SERIAL_M32R_PLDSIO
474 // if (irq == PLD_IRQ_SIO0_SND)
475 // irq = PLD_IRQ_SIO0_RCV;
477 if (irq == M32R_IRQ_SIO0_S)
478 irq = M32R_IRQ_SIO0_R;
485 struct uart_sio_port *up;
488 up = list_entry(l, struct uart_sio_port, list);
490 sts = sio_in(up, SIOSTS);
492 spin_lock(&up->port.lock);
493 m32r_sio_handle_port(up, sts);
494 spin_unlock(&up->port.lock);
497 } else if (end == NULL)
502 if (l == i->head && pass_counter++ > PASS_LIMIT) {
509 spin_unlock(&i->lock);
511 DEBUG_INTR("end.\n");
517 * To support ISA shared interrupts, we need to have one interrupt
518 * handler that ensures that the IRQ line has been deasserted
519 * before returning. Failing to do this will result in the IRQ
520 * line being stuck active, and, since ISA irqs are edge triggered,
521 * no more IRQs will be seen.
523 static void serial_do_unlink(struct irq_info *i, struct uart_sio_port *up)
525 spin_lock_irq(&i->lock);
527 if (!list_empty(i->head)) {
528 if (i->head == &up->list)
529 i->head = i->head->next;
532 BUG_ON(i->head != &up->list);
536 spin_unlock_irq(&i->lock);
539 static int serial_link_irq_chain(struct uart_sio_port *up)
541 struct irq_info *i = irq_lists + up->port.irq;
542 int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? IRQF_SHARED : 0;
544 spin_lock_irq(&i->lock);
547 list_add(&up->list, i->head);
548 spin_unlock_irq(&i->lock);
552 INIT_LIST_HEAD(&up->list);
554 spin_unlock_irq(&i->lock);
556 ret = request_irq(up->port.irq, m32r_sio_interrupt,
557 irq_flags, "SIO0-RX", i);
558 ret |= request_irq(up->port.irq + 1, m32r_sio_interrupt,
559 irq_flags, "SIO0-TX", i);
561 serial_do_unlink(i, up);
567 static void serial_unlink_irq_chain(struct uart_sio_port *up)
569 struct irq_info *i = irq_lists + up->port.irq;
571 BUG_ON(i->head == NULL);
573 if (list_empty(i->head)) {
574 free_irq(up->port.irq, i);
575 free_irq(up->port.irq + 1, i);
578 serial_do_unlink(i, up);
582 * This function is used to handle ports that do not have an interrupt.
584 static void m32r_sio_timeout(unsigned long data)
586 struct uart_sio_port *up = (struct uart_sio_port *)data;
587 unsigned int timeout;
590 sts = sio_in(up, SIOSTS);
592 spin_lock(&up->port.lock);
593 m32r_sio_handle_port(up, sts);
594 spin_unlock(&up->port.lock);
597 timeout = up->port.timeout;
598 timeout = timeout > 6 ? (timeout / 2 - 2) : 1;
599 mod_timer(&up->timer, jiffies + timeout);
602 static unsigned int m32r_sio_tx_empty(struct uart_port *port)
604 struct uart_sio_port *up = (struct uart_sio_port *)port;
608 spin_lock_irqsave(&up->port.lock, flags);
609 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
610 spin_unlock_irqrestore(&up->port.lock, flags);
615 static unsigned int m32r_sio_get_mctrl(struct uart_port *port)
620 static void m32r_sio_set_mctrl(struct uart_port *port, unsigned int mctrl)
625 static void m32r_sio_break_ctl(struct uart_port *port, int break_state)
630 static int m32r_sio_startup(struct uart_port *port)
632 struct uart_sio_port *up = (struct uart_sio_port *)port;
638 * If the "interrupt" for this port doesn't correspond with any
639 * hardware interrupt, we use a timer-based system. The original
640 * driver used to do this with IRQ0.
642 if (!is_real_interrupt(up->port.irq)) {
643 unsigned int timeout = up->port.timeout;
645 timeout = timeout > 6 ? (timeout / 2 - 2) : 1;
647 up->timer.data = (unsigned long)up;
648 mod_timer(&up->timer, jiffies + timeout);
650 retval = serial_link_irq_chain(up);
656 * Finally, enable interrupts. Note: Modem status interrupts
657 * are set via set_termios(), which will be occurring imminently
658 * anyway, so we don't enable them here.
660 * - M32R_PLDSIO: 0x04
662 up->ier = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
663 sio_out(up, SIOTRCR, up->ier);
666 * And clear the interrupt registers again for luck.
673 static void m32r_sio_shutdown(struct uart_port *port)
675 struct uart_sio_port *up = (struct uart_sio_port *)port;
678 * Disable interrupts from this port
681 sio_out(up, SIOTRCR, 0);
684 * Disable break condition and FIFOs
689 if (!is_real_interrupt(up->port.irq))
690 del_timer_sync(&up->timer);
692 serial_unlink_irq_chain(up);
695 static unsigned int m32r_sio_get_divisor(struct uart_port *port,
698 return uart_get_divisor(port, baud);
701 static void m32r_sio_set_termios(struct uart_port *port,
702 struct ktermios *termios, struct ktermios *old)
704 struct uart_sio_port *up = (struct uart_sio_port *)port;
705 unsigned char cval = 0;
707 unsigned int baud, quot;
709 switch (termios->c_cflag & CSIZE) {
711 cval = UART_LCR_WLEN5;
714 cval = UART_LCR_WLEN6;
717 cval = UART_LCR_WLEN7;
721 cval = UART_LCR_WLEN8;
725 if (termios->c_cflag & CSTOPB)
726 cval |= UART_LCR_STOP;
727 if (termios->c_cflag & PARENB)
728 cval |= UART_LCR_PARITY;
729 if (!(termios->c_cflag & PARODD))
730 cval |= UART_LCR_EPAR;
732 if (termios->c_cflag & CMSPAR)
733 cval |= UART_LCR_SPAR;
737 * Ask the core to calculate the divisor for us.
739 #ifdef CONFIG_SERIAL_M32R_PLDSIO
740 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/4);
742 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
744 quot = m32r_sio_get_divisor(port, baud);
747 * Ok, we're now changing the port state. Do it with
748 * interrupts disabled.
750 spin_lock_irqsave(&up->port.lock, flags);
752 sio_set_baud_rate(baud);
755 * Update the per-port timeout.
757 uart_update_timeout(port, termios->c_cflag, baud);
759 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
760 if (termios->c_iflag & INPCK)
761 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
762 if (termios->c_iflag & (BRKINT | PARMRK))
763 up->port.read_status_mask |= UART_LSR_BI;
766 * Characteres to ignore
768 up->port.ignore_status_mask = 0;
769 if (termios->c_iflag & IGNPAR)
770 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
771 if (termios->c_iflag & IGNBRK) {
772 up->port.ignore_status_mask |= UART_LSR_BI;
774 * If we're ignoring parity and break indicators,
775 * ignore overruns too (for real raw support).
777 if (termios->c_iflag & IGNPAR)
778 up->port.ignore_status_mask |= UART_LSR_OE;
782 * ignore all characters if CREAD is not set
784 if ((termios->c_cflag & CREAD) == 0)
785 up->port.ignore_status_mask |= UART_LSR_DR;
788 * CTS flow control flag and modem status interrupts
790 up->ier &= ~UART_IER_MSI;
791 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
792 up->ier |= UART_IER_MSI;
794 serial_out(up, UART_IER, up->ier);
796 up->lcr = cval; /* Save LCR */
797 spin_unlock_irqrestore(&up->port.lock, flags);
800 static void m32r_sio_pm(struct uart_port *port, unsigned int state,
801 unsigned int oldstate)
803 struct uart_sio_port *up = (struct uart_sio_port *)port;
806 up->pm(port, state, oldstate);
810 * Resource handling. This is complicated by the fact that resources
811 * depend on the port type. Maybe we should be claiming the standard
812 * 8250 ports, and then trying to get other resources as necessary?
815 m32r_sio_request_std_resource(struct uart_sio_port *up, struct resource **res)
817 unsigned int size = 8 << up->port.regshift;
818 #ifndef CONFIG_SERIAL_M32R_PLDSIO
823 switch (up->port.iotype) {
825 if (up->port.mapbase) {
826 #ifdef CONFIG_SERIAL_M32R_PLDSIO
827 *res = request_mem_region(up->port.mapbase, size, "serial");
829 start = up->port.mapbase;
830 *res = request_mem_region(start, size, "serial");
838 *res = request_region(up->port.iobase, size, "serial");
846 static void m32r_sio_release_port(struct uart_port *port)
848 struct uart_sio_port *up = (struct uart_sio_port *)port;
849 unsigned long start, offset = 0, size = 0;
851 size <<= up->port.regshift;
853 switch (up->port.iotype) {
855 if (up->port.mapbase) {
859 iounmap(up->port.membase);
860 up->port.membase = NULL;
862 start = up->port.mapbase;
865 release_mem_region(start + offset, size);
866 release_mem_region(start, 8 << up->port.regshift);
871 start = up->port.iobase;
874 release_region(start + offset, size);
875 release_region(start + offset, 8 << up->port.regshift);
883 static int m32r_sio_request_port(struct uart_port *port)
885 struct uart_sio_port *up = (struct uart_sio_port *)port;
886 struct resource *res = NULL;
889 ret = m32r_sio_request_std_resource(up, &res);
892 * If we have a mapbase, then request that as well.
894 if (ret == 0 && up->port.flags & UPF_IOREMAP) {
895 int size = res->end - res->start + 1;
897 up->port.membase = ioremap(up->port.mapbase, size);
898 if (!up->port.membase)
904 release_resource(res);
910 static void m32r_sio_config_port(struct uart_port *port, int flags)
912 struct uart_sio_port *up = (struct uart_sio_port *)port;
914 spin_lock_irqsave(&up->port.lock, flags);
916 up->port.type = (PORT_M32R_SIO - PORT_M32R_BASE + 1);
917 up->port.fifosize = uart_config[up->port.type].dfl_xmit_fifo_size;
919 spin_unlock_irqrestore(&up->port.lock, flags);
923 m32r_sio_verify_port(struct uart_port *port, struct serial_struct *ser)
925 if (ser->irq >= NR_IRQS || ser->irq < 0 ||
926 ser->baud_base < 9600 || ser->type < PORT_UNKNOWN ||
927 ser->type >= ARRAY_SIZE(uart_config))
933 m32r_sio_type(struct uart_port *port)
935 int type = port->type;
937 if (type >= ARRAY_SIZE(uart_config))
939 return uart_config[type].name;
942 static struct uart_ops m32r_sio_pops = {
943 .tx_empty = m32r_sio_tx_empty,
944 .set_mctrl = m32r_sio_set_mctrl,
945 .get_mctrl = m32r_sio_get_mctrl,
946 .stop_tx = m32r_sio_stop_tx,
947 .start_tx = m32r_sio_start_tx,
948 .stop_rx = m32r_sio_stop_rx,
949 .enable_ms = m32r_sio_enable_ms,
950 .break_ctl = m32r_sio_break_ctl,
951 .startup = m32r_sio_startup,
952 .shutdown = m32r_sio_shutdown,
953 .set_termios = m32r_sio_set_termios,
955 .type = m32r_sio_type,
956 .release_port = m32r_sio_release_port,
957 .request_port = m32r_sio_request_port,
958 .config_port = m32r_sio_config_port,
959 .verify_port = m32r_sio_verify_port,
962 static struct uart_sio_port m32r_sio_ports[UART_NR];
964 static void __init m32r_sio_init_ports(void)
966 struct uart_sio_port *up;
967 static int first = 1;
974 for (i = 0, up = m32r_sio_ports; i < ARRAY_SIZE(old_serial_port);
976 up->port.iobase = old_serial_port[i].port;
977 up->port.irq = irq_canonicalize(old_serial_port[i].irq);
978 up->port.uartclk = old_serial_port[i].baud_base * 16;
979 up->port.flags = old_serial_port[i].flags;
980 up->port.membase = old_serial_port[i].iomem_base;
981 up->port.iotype = old_serial_port[i].io_type;
982 up->port.regshift = old_serial_port[i].iomem_reg_shift;
983 up->port.ops = &m32r_sio_pops;
987 static void __init m32r_sio_register_ports(struct uart_driver *drv)
991 m32r_sio_init_ports();
993 for (i = 0; i < UART_NR; i++) {
994 struct uart_sio_port *up = &m32r_sio_ports[i];
997 up->port.ops = &m32r_sio_pops;
998 init_timer(&up->timer);
999 up->timer.function = m32r_sio_timeout;
1002 * ALPHA_KLUDGE_MCR needs to be killed.
1004 up->mcr_mask = ~ALPHA_KLUDGE_MCR;
1005 up->mcr_force = ALPHA_KLUDGE_MCR;
1007 uart_add_one_port(drv, &up->port);
1011 #ifdef CONFIG_SERIAL_M32R_SIO_CONSOLE
1014 * Wait for transmitter & holding register to empty
1016 static inline void wait_for_xmitr(struct uart_sio_port *up)
1018 unsigned int status, tmout = 10000;
1020 /* Wait up to 10ms for the character(s) to be sent. */
1022 status = sio_in(up, SIOSTS);
1027 } while ((status & UART_EMPTY) != UART_EMPTY);
1029 /* Wait up to 1s for flow control if necessary */
1030 if (up->port.flags & UPF_CONS_FLOW) {
1037 static void m32r_sio_console_putchar(struct uart_port *port, int ch)
1039 struct uart_sio_port *up = (struct uart_sio_port *)port;
1042 sio_out(up, SIOTXB, ch);
1046 * Print a string to the serial port trying not to disturb
1047 * any possible real use of the port...
1049 * The console_lock must be held when we get here.
1051 static void m32r_sio_console_write(struct console *co, const char *s,
1054 struct uart_sio_port *up = &m32r_sio_ports[co->index];
1058 * First save the UER then disable the interrupts
1060 ier = sio_in(up, SIOTRCR);
1061 sio_out(up, SIOTRCR, 0);
1063 uart_console_write(&up->port, s, count, m32r_sio_console_putchar);
1066 * Finally, wait for transmitter to become empty
1067 * and restore the IER
1070 sio_out(up, SIOTRCR, ier);
1073 static int __init m32r_sio_console_setup(struct console *co, char *options)
1075 struct uart_port *port;
1082 * Check whether an invalid uart number has been specified, and
1083 * if so, search for the first available port that does have
1086 if (co->index >= UART_NR)
1088 port = &m32r_sio_ports[co->index].port;
1093 spin_lock_init(&port->lock);
1096 uart_parse_options(options, &baud, &parity, &bits, &flow);
1098 return uart_set_options(port, co, baud, parity, bits, flow);
1101 static struct uart_driver m32r_sio_reg;
1102 static struct console m32r_sio_console = {
1104 .write = m32r_sio_console_write,
1105 .device = uart_console_device,
1106 .setup = m32r_sio_console_setup,
1107 .flags = CON_PRINTBUFFER,
1109 .data = &m32r_sio_reg,
1112 static int __init m32r_sio_console_init(void)
1116 m32r_sio_init_ports();
1117 register_console(&m32r_sio_console);
1120 console_initcall(m32r_sio_console_init);
1122 #define M32R_SIO_CONSOLE &m32r_sio_console
1124 #define M32R_SIO_CONSOLE NULL
1127 static struct uart_driver m32r_sio_reg = {
1128 .owner = THIS_MODULE,
1129 .driver_name = "sio",
1134 .cons = M32R_SIO_CONSOLE,
1138 * m32r_sio_suspend_port - suspend one serial port
1139 * @line: serial line number
1141 * Suspend one serial port.
1143 void m32r_sio_suspend_port(int line)
1145 uart_suspend_port(&m32r_sio_reg, &m32r_sio_ports[line].port);
1149 * m32r_sio_resume_port - resume one serial port
1150 * @line: serial line number
1152 * Resume one serial port.
1154 void m32r_sio_resume_port(int line)
1156 uart_resume_port(&m32r_sio_reg, &m32r_sio_ports[line].port);
1159 static int __init m32r_sio_init(void)
1163 printk(KERN_INFO "Serial: M32R SIO driver $Revision: 1.11 $ ");
1165 for (i = 0; i < NR_IRQS; i++)
1166 spin_lock_init(&irq_lists[i].lock);
1168 ret = uart_register_driver(&m32r_sio_reg);
1170 m32r_sio_register_ports(&m32r_sio_reg);
1175 static void __exit m32r_sio_exit(void)
1179 for (i = 0; i < UART_NR; i++)
1180 uart_remove_one_port(&m32r_sio_reg, &m32r_sio_ports[i].port);
1182 uart_unregister_driver(&m32r_sio_reg);
1185 module_init(m32r_sio_init);
1186 module_exit(m32r_sio_exit);
1188 EXPORT_SYMBOL(m32r_sio_suspend_port);
1189 EXPORT_SYMBOL(m32r_sio_resume_port);
1191 MODULE_LICENSE("GPL");
1192 MODULE_DESCRIPTION("Generic M32R SIO serial driver $Revision: 1.11 $");