2 * drivers/serial/netx-serial.c
4 * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #if defined(CONFIG_SERIAL_NETX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
24 #include <linux/device.h>
25 #include <linux/module.h>
26 #include <linux/ioport.h>
27 #include <linux/init.h>
28 #include <linux/console.h>
29 #include <linux/sysrq.h>
30 #include <linux/platform_device.h>
31 #include <linux/tty.h>
32 #include <linux/tty_flip.h>
33 #include <linux/serial_core.h>
34 #include <linux/serial.h>
38 #include <asm/hardware.h>
39 #include <asm/arch/netx-regs.h>
41 /* We've been assigned a range on the "Low-density serial ports" major */
42 #define SERIAL_NX_MAJOR 204
43 #define MINOR_START 170
45 #ifdef CONFIG_SERIAL_NETX_CONSOLE
51 UART_BAUDDIV_MSB = 0x0c,
52 UART_BAUDDIV_LSB = 0x10,
59 UART_RTS_TRAIL = 0x2c,
60 UART_DRV_ENABLE = 0x30,
62 UART_RXFIFO_IRQLEVEL = 0x38,
63 UART_TXFIFO_IRQLEVEL = 0x3c,
71 #define LINE_CR_BRK (1<<0)
72 #define LINE_CR_PEN (1<<1)
73 #define LINE_CR_EPS (1<<2)
74 #define LINE_CR_STP2 (1<<3)
75 #define LINE_CR_FEN (1<<4)
76 #define LINE_CR_5BIT (0<<5)
77 #define LINE_CR_6BIT (1<<5)
78 #define LINE_CR_7BIT (2<<5)
79 #define LINE_CR_8BIT (3<<5)
80 #define LINE_CR_BITS_MASK (3<<5)
82 #define CR_UART_EN (1<<0)
83 #define CR_SIREN (1<<1)
84 #define CR_SIRLP (1<<2)
85 #define CR_MSIE (1<<3)
88 #define CR_RTIE (1<<6)
94 #define FR_BUSY (1<<3)
95 #define FR_RXFE (1<<4)
96 #define FR_TXFF (1<<5)
97 #define FR_RXFF (1<<6)
98 #define FR_TXFE (1<<7)
100 #define IIR_MIS (1<<0)
101 #define IIR_RIS (1<<1)
102 #define IIR_TIS (1<<2)
103 #define IIR_RTIS (1<<3)
106 #define RTS_CR_AUTO (1<<0)
107 #define RTS_CR_RTS (1<<1)
108 #define RTS_CR_COUNT (1<<2)
109 #define RTS_CR_MOD2 (1<<3)
110 #define RTS_CR_RTS_POL (1<<4)
111 #define RTS_CR_CTS_CTR (1<<5)
112 #define RTS_CR_CTS_POL (1<<6)
113 #define RTS_CR_STICK (1<<7)
115 #define UART_PORT_SIZE 0x40
116 #define DRIVER_NAME "netx-uart"
119 struct uart_port port;
122 static void netx_stop_tx(struct uart_port *port)
125 val = readl(port->membase + UART_CR);
126 writel(val & ~CR_TIE, port->membase + UART_CR);
129 static void netx_stop_rx(struct uart_port *port)
132 val = readl(port->membase + UART_CR);
133 writel(val & ~CR_RIE, port->membase + UART_CR);
136 static void netx_enable_ms(struct uart_port *port)
139 val = readl(port->membase + UART_CR);
140 writel(val | CR_MSIE, port->membase + UART_CR);
143 static inline void netx_transmit_buffer(struct uart_port *port)
145 struct circ_buf *xmit = &port->info->xmit;
148 writel(port->x_char, port->membase + UART_DR);
154 if (uart_tx_stopped(port) || uart_circ_empty(xmit)) {
160 /* send xmit->buf[xmit->tail]
161 * out the port here */
162 writel(xmit->buf[xmit->tail], port->membase + UART_DR);
163 xmit->tail = (xmit->tail + 1) &
164 (UART_XMIT_SIZE - 1);
166 if (uart_circ_empty(xmit))
168 } while (!(readl(port->membase + UART_FR) & FR_TXFF));
170 if (uart_circ_empty(xmit))
174 static void netx_start_tx(struct uart_port *port)
177 readl(port->membase + UART_CR) | CR_TIE, port->membase + UART_CR);
179 if (!(readl(port->membase + UART_FR) & FR_TXFF))
180 netx_transmit_buffer(port);
183 static unsigned int netx_tx_empty(struct uart_port *port)
185 return readl(port->membase + UART_FR) & FR_BUSY ? 0 : TIOCSER_TEMT;
188 static void netx_txint(struct uart_port *port)
190 struct circ_buf *xmit = &port->info->xmit;
192 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
197 netx_transmit_buffer(port);
199 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
200 uart_write_wakeup(port);
203 static void netx_rxint(struct uart_port *port)
205 unsigned char rx, flg, status;
206 struct tty_struct *tty = port->info->tty;
208 while (!(readl(port->membase + UART_FR) & FR_RXFE)) {
209 rx = readl(port->membase + UART_DR);
212 status = readl(port->membase + UART_SR);
213 if (status & SR_BE) {
214 writel(0, port->membase + UART_SR);
215 if (uart_handle_break(port))
219 if (unlikely(status & (SR_FE | SR_PE | SR_OE))) {
222 port->icount.parity++;
223 else if (status & SR_FE)
224 port->icount.frame++;
226 port->icount.overrun++;
228 status &= port->read_status_mask;
232 else if (status & SR_PE)
234 else if (status & SR_FE)
238 if (uart_handle_sysrq_char(port, rx))
241 uart_insert_char(port, status, SR_OE, rx, flg);
244 tty_flip_buffer_push(tty);
248 static irqreturn_t netx_int(int irq, void *dev_id)
250 struct uart_port *port = dev_id;
252 unsigned char status;
254 spin_lock_irqsave(&port->lock,flags);
256 status = readl(port->membase + UART_IIR) & IIR_MASK;
258 if (status & IIR_RIS)
260 if (status & IIR_TIS)
262 if (status & IIR_MIS) {
263 if (readl(port->membase + UART_FR) & FR_CTS)
264 uart_handle_cts_change(port, 1);
266 uart_handle_cts_change(port, 0);
268 writel(0, port->membase + UART_IIR);
269 status = readl(port->membase + UART_IIR) & IIR_MASK;
272 spin_unlock_irqrestore(&port->lock,flags);
276 static unsigned int netx_get_mctrl(struct uart_port *port)
278 unsigned int ret = TIOCM_DSR | TIOCM_CAR;
280 if (readl(port->membase + UART_FR) & FR_CTS)
286 static void netx_set_mctrl(struct uart_port *port, unsigned int mctrl)
290 if (mctrl & TIOCM_RTS) {
291 val = readl(port->membase + UART_RTS_CR);
292 writel(val | RTS_CR_RTS, port->membase + UART_RTS_CR);
296 static void netx_break_ctl(struct uart_port *port, int break_state)
298 unsigned int line_cr;
299 spin_lock_irq(&port->lock);
301 line_cr = readl(port->membase + UART_LINE_CR);
302 if (break_state != 0)
303 line_cr |= LINE_CR_BRK;
305 line_cr &= ~LINE_CR_BRK;
306 writel(line_cr, port->membase + UART_LINE_CR);
308 spin_unlock_irq(&port->lock);
311 static int netx_startup(struct uart_port *port)
315 ret = request_irq(port->irq, netx_int, 0,
318 dev_err(port->dev, "unable to grab irq%d\n",port->irq);
322 writel(readl(port->membase + UART_LINE_CR) | LINE_CR_FEN,
323 port->membase + UART_LINE_CR);
325 writel(CR_MSIE | CR_RIE | CR_TIE | CR_RTIE | CR_UART_EN,
326 port->membase + UART_CR);
332 static void netx_shutdown(struct uart_port *port)
334 writel(0, port->membase + UART_CR) ;
336 free_irq(port->irq, port);
340 netx_set_termios(struct uart_port *port, struct ktermios *termios,
341 struct ktermios *old)
343 unsigned int baud, quot;
344 unsigned char old_cr;
345 unsigned char line_cr = LINE_CR_FEN;
346 unsigned char rts_cr = 0;
348 switch (termios->c_cflag & CSIZE) {
350 line_cr |= LINE_CR_5BIT;
353 line_cr |= LINE_CR_6BIT;
356 line_cr |= LINE_CR_7BIT;
359 line_cr |= LINE_CR_8BIT;
363 if (termios->c_cflag & CSTOPB)
364 line_cr |= LINE_CR_STP2;
366 if (termios->c_cflag & PARENB) {
367 line_cr |= LINE_CR_PEN;
368 if (!(termios->c_cflag & PARODD))
369 line_cr |= LINE_CR_EPS;
372 if (termios->c_cflag & CRTSCTS)
373 rts_cr = RTS_CR_AUTO | RTS_CR_CTS_CTR | RTS_CR_RTS_POL;
375 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
381 spin_lock_irq(&port->lock);
383 uart_update_timeout(port, termios->c_cflag, baud);
385 old_cr = readl(port->membase + UART_CR);
387 /* disable interrupts */
388 writel(old_cr & ~(CR_MSIE | CR_RIE | CR_TIE | CR_RTIE),
389 port->membase + UART_CR);
391 /* drain transmitter */
392 while (readl(port->membase + UART_FR) & FR_BUSY);
395 writel(old_cr & ~CR_UART_EN, port->membase + UART_CR);
397 /* modem status interrupts */
399 if (UART_ENABLE_MS(port, termios->c_cflag))
402 writel((quot>>8) & 0xff, port->membase + UART_BAUDDIV_MSB);
403 writel(quot & 0xff, port->membase + UART_BAUDDIV_LSB);
404 writel(line_cr, port->membase + UART_LINE_CR);
406 writel(rts_cr, port->membase + UART_RTS_CR);
409 * Characters to ignore
411 port->ignore_status_mask = 0;
412 if (termios->c_iflag & IGNPAR)
413 port->ignore_status_mask |= SR_PE;
414 if (termios->c_iflag & IGNBRK) {
415 port->ignore_status_mask |= SR_BE;
417 * If we're ignoring parity and break indicators,
418 * ignore overruns too (for real raw support).
420 if (termios->c_iflag & IGNPAR)
421 port->ignore_status_mask |= SR_PE;
424 port->read_status_mask = 0;
425 if (termios->c_iflag & (BRKINT | PARMRK))
426 port->read_status_mask |= SR_BE;
427 if (termios->c_iflag & INPCK)
428 port->read_status_mask |= SR_PE | SR_FE;
430 writel(old_cr, port->membase + UART_CR);
432 spin_unlock_irq(&port->lock);
435 static const char *netx_type(struct uart_port *port)
437 return port->type == PORT_NETX ? "NETX" : NULL;
440 static void netx_release_port(struct uart_port *port)
442 release_mem_region(port->mapbase, UART_PORT_SIZE);
445 static int netx_request_port(struct uart_port *port)
447 return request_mem_region(port->mapbase, UART_PORT_SIZE,
448 DRIVER_NAME) != NULL ? 0 : -EBUSY;
451 static void netx_config_port(struct uart_port *port, int flags)
453 if (flags & UART_CONFIG_TYPE && netx_request_port(port) == 0)
454 port->type = PORT_NETX;
458 netx_verify_port(struct uart_port *port, struct serial_struct *ser)
462 if (ser->type != PORT_UNKNOWN && ser->type != PORT_NETX)
468 static struct uart_ops netx_pops = {
469 .tx_empty = netx_tx_empty,
470 .set_mctrl = netx_set_mctrl,
471 .get_mctrl = netx_get_mctrl,
472 .stop_tx = netx_stop_tx,
473 .start_tx = netx_start_tx,
474 .stop_rx = netx_stop_rx,
475 .enable_ms = netx_enable_ms,
476 .break_ctl = netx_break_ctl,
477 .startup = netx_startup,
478 .shutdown = netx_shutdown,
479 .set_termios = netx_set_termios,
481 .release_port = netx_release_port,
482 .request_port = netx_request_port,
483 .config_port = netx_config_port,
484 .verify_port = netx_verify_port,
487 static struct netx_port netx_ports[] = {
492 .membase = (char __iomem *)io_p2v(NETX_PA_UART0),
493 .mapbase = NETX_PA_UART0,
494 .irq = NETX_IRQ_UART0,
495 .uartclk = 100000000,
497 .flags = UPF_BOOT_AUTOCONF,
505 .membase = (char __iomem *)io_p2v(NETX_PA_UART1),
506 .mapbase = NETX_PA_UART1,
507 .irq = NETX_IRQ_UART1,
508 .uartclk = 100000000,
510 .flags = UPF_BOOT_AUTOCONF,
518 .membase = (char __iomem *)io_p2v(NETX_PA_UART2),
519 .mapbase = NETX_PA_UART2,
520 .irq = NETX_IRQ_UART2,
521 .uartclk = 100000000,
523 .flags = UPF_BOOT_AUTOCONF,
530 static void netx_console_putchar(struct uart_port *port, int ch)
532 while (readl(port->membase + UART_FR) & FR_BUSY);
533 writel(ch, port->membase + UART_DR);
537 netx_console_write(struct console *co, const char *s, unsigned int count)
539 struct uart_port *port = &netx_ports[co->index].port;
540 unsigned char cr_save;
542 cr_save = readl(port->membase + UART_CR);
543 writel(cr_save | CR_UART_EN, port->membase + UART_CR);
545 uart_console_write(port, s, count, netx_console_putchar);
547 while (readl(port->membase + UART_FR) & FR_BUSY);
548 writel(cr_save, port->membase + UART_CR);
552 netx_console_get_options(struct uart_port *port, int *baud,
553 int *parity, int *bits, int *flow)
555 unsigned char line_cr;
557 *baud = (readl(port->membase + UART_BAUDDIV_MSB) << 8) |
558 readl(port->membase + UART_BAUDDIV_LSB);
565 line_cr = readl(port->membase + UART_LINE_CR);
567 if (line_cr & LINE_CR_PEN) {
568 if (line_cr & LINE_CR_EPS)
574 switch (line_cr & LINE_CR_BITS_MASK) {
589 if (readl(port->membase + UART_RTS_CR) & RTS_CR_AUTO)
594 netx_console_setup(struct console *co, char *options)
596 struct netx_port *sport;
603 * Check whether an invalid uart number has been specified, and
604 * if so, search for the first available port that does have
607 if (co->index == -1 || co->index >= ARRAY_SIZE(netx_ports))
609 sport = &netx_ports[co->index];
612 uart_parse_options(options, &baud, &parity, &bits, &flow);
614 /* if the UART is enabled, assume it has been correctly setup
615 * by the bootloader and get the options
617 if (readl(sport->port.membase + UART_CR) & CR_UART_EN) {
618 netx_console_get_options(&sport->port, &baud,
619 &parity, &bits, &flow);
624 return uart_set_options(&sport->port, co, baud, parity, bits, flow);
627 static struct uart_driver netx_reg;
628 static struct console netx_console = {
630 .write = netx_console_write,
631 .device = uart_console_device,
632 .setup = netx_console_setup,
633 .flags = CON_PRINTBUFFER,
638 static int __init netx_console_init(void)
640 register_console(&netx_console);
643 console_initcall(netx_console_init);
645 #define NETX_CONSOLE &netx_console
647 #define NETX_CONSOLE NULL
650 static struct uart_driver netx_reg = {
651 .owner = THIS_MODULE,
652 .driver_name = DRIVER_NAME,
654 .major = SERIAL_NX_MAJOR,
655 .minor = MINOR_START,
656 .nr = ARRAY_SIZE(netx_ports),
657 .cons = NETX_CONSOLE,
660 static int serial_netx_suspend(struct platform_device *pdev, pm_message_t state)
662 struct netx_port *sport = platform_get_drvdata(pdev);
665 uart_suspend_port(&netx_reg, &sport->port);
670 static int serial_netx_resume(struct platform_device *pdev)
672 struct netx_port *sport = platform_get_drvdata(pdev);
675 uart_resume_port(&netx_reg, &sport->port);
680 static int serial_netx_probe(struct platform_device *pdev)
682 struct uart_port *port = &netx_ports[pdev->id].port;
684 dev_info(&pdev->dev, "initialising\n");
686 port->dev = &pdev->dev;
688 writel(1, port->membase + UART_RXFIFO_IRQLEVEL);
689 uart_add_one_port(&netx_reg, &netx_ports[pdev->id].port);
690 platform_set_drvdata(pdev, &netx_ports[pdev->id]);
695 static int serial_netx_remove(struct platform_device *pdev)
697 struct netx_port *sport = platform_get_drvdata(pdev);
699 platform_set_drvdata(pdev, NULL);
702 uart_remove_one_port(&netx_reg, &sport->port);
707 static struct platform_driver serial_netx_driver = {
708 .probe = serial_netx_probe,
709 .remove = serial_netx_remove,
711 .suspend = serial_netx_suspend,
712 .resume = serial_netx_resume,
719 static int __init netx_serial_init(void)
723 printk(KERN_INFO "Serial: NetX driver\n");
725 ret = uart_register_driver(&netx_reg);
729 ret = platform_driver_register(&serial_netx_driver);
731 uart_unregister_driver(&netx_reg);
736 static void __exit netx_serial_exit(void)
738 platform_driver_unregister(&serial_netx_driver);
739 uart_unregister_driver(&netx_reg);
742 module_init(netx_serial_init);
743 module_exit(netx_serial_exit);
745 MODULE_AUTHOR("Sascha Hauer");
746 MODULE_DESCRIPTION("NetX serial port driver");
747 MODULE_LICENSE("GPL");