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 <mach/hardware.h>
39 #include <mach/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
49 UART_BAUDDIV_MSB = 0x0c,
50 UART_BAUDDIV_LSB = 0x10,
57 UART_RTS_TRAIL = 0x2c,
58 UART_DRV_ENABLE = 0x30,
60 UART_RXFIFO_IRQLEVEL = 0x38,
61 UART_TXFIFO_IRQLEVEL = 0x3c,
69 #define LINE_CR_BRK (1<<0)
70 #define LINE_CR_PEN (1<<1)
71 #define LINE_CR_EPS (1<<2)
72 #define LINE_CR_STP2 (1<<3)
73 #define LINE_CR_FEN (1<<4)
74 #define LINE_CR_5BIT (0<<5)
75 #define LINE_CR_6BIT (1<<5)
76 #define LINE_CR_7BIT (2<<5)
77 #define LINE_CR_8BIT (3<<5)
78 #define LINE_CR_BITS_MASK (3<<5)
80 #define CR_UART_EN (1<<0)
81 #define CR_SIREN (1<<1)
82 #define CR_SIRLP (1<<2)
83 #define CR_MSIE (1<<3)
86 #define CR_RTIE (1<<6)
92 #define FR_BUSY (1<<3)
93 #define FR_RXFE (1<<4)
94 #define FR_TXFF (1<<5)
95 #define FR_RXFF (1<<6)
96 #define FR_TXFE (1<<7)
98 #define IIR_MIS (1<<0)
99 #define IIR_RIS (1<<1)
100 #define IIR_TIS (1<<2)
101 #define IIR_RTIS (1<<3)
104 #define RTS_CR_AUTO (1<<0)
105 #define RTS_CR_RTS (1<<1)
106 #define RTS_CR_COUNT (1<<2)
107 #define RTS_CR_MOD2 (1<<3)
108 #define RTS_CR_RTS_POL (1<<4)
109 #define RTS_CR_CTS_CTR (1<<5)
110 #define RTS_CR_CTS_POL (1<<6)
111 #define RTS_CR_STICK (1<<7)
113 #define UART_PORT_SIZE 0x40
114 #define DRIVER_NAME "netx-uart"
117 struct uart_port port;
120 static void netx_stop_tx(struct uart_port *port)
123 val = readl(port->membase + UART_CR);
124 writel(val & ~CR_TIE, port->membase + UART_CR);
127 static void netx_stop_rx(struct uart_port *port)
130 val = readl(port->membase + UART_CR);
131 writel(val & ~CR_RIE, port->membase + UART_CR);
134 static void netx_enable_ms(struct uart_port *port)
137 val = readl(port->membase + UART_CR);
138 writel(val | CR_MSIE, port->membase + UART_CR);
141 static inline void netx_transmit_buffer(struct uart_port *port)
143 struct circ_buf *xmit = &port->state->xmit;
146 writel(port->x_char, port->membase + UART_DR);
152 if (uart_tx_stopped(port) || uart_circ_empty(xmit)) {
158 /* send xmit->buf[xmit->tail]
159 * out the port here */
160 writel(xmit->buf[xmit->tail], port->membase + UART_DR);
161 xmit->tail = (xmit->tail + 1) &
162 (UART_XMIT_SIZE - 1);
164 if (uart_circ_empty(xmit))
166 } while (!(readl(port->membase + UART_FR) & FR_TXFF));
168 if (uart_circ_empty(xmit))
172 static void netx_start_tx(struct uart_port *port)
175 readl(port->membase + UART_CR) | CR_TIE, port->membase + UART_CR);
177 if (!(readl(port->membase + UART_FR) & FR_TXFF))
178 netx_transmit_buffer(port);
181 static unsigned int netx_tx_empty(struct uart_port *port)
183 return readl(port->membase + UART_FR) & FR_BUSY ? 0 : TIOCSER_TEMT;
186 static void netx_txint(struct uart_port *port)
188 struct circ_buf *xmit = &port->state->xmit;
190 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
195 netx_transmit_buffer(port);
197 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
198 uart_write_wakeup(port);
201 static void netx_rxint(struct uart_port *port)
203 unsigned char rx, flg, status;
204 struct tty_struct *tty = port->state->port.tty;
206 while (!(readl(port->membase + UART_FR) & FR_RXFE)) {
207 rx = readl(port->membase + UART_DR);
210 status = readl(port->membase + UART_SR);
211 if (status & SR_BE) {
212 writel(0, port->membase + UART_SR);
213 if (uart_handle_break(port))
217 if (unlikely(status & (SR_FE | SR_PE | SR_OE))) {
220 port->icount.parity++;
221 else if (status & SR_FE)
222 port->icount.frame++;
224 port->icount.overrun++;
226 status &= port->read_status_mask;
230 else if (status & SR_PE)
232 else if (status & SR_FE)
236 if (uart_handle_sysrq_char(port, rx))
239 uart_insert_char(port, status, SR_OE, rx, flg);
242 tty_flip_buffer_push(tty);
246 static irqreturn_t netx_int(int irq, void *dev_id)
248 struct uart_port *port = dev_id;
250 unsigned char status;
252 spin_lock_irqsave(&port->lock,flags);
254 status = readl(port->membase + UART_IIR) & IIR_MASK;
256 if (status & IIR_RIS)
258 if (status & IIR_TIS)
260 if (status & IIR_MIS) {
261 if (readl(port->membase + UART_FR) & FR_CTS)
262 uart_handle_cts_change(port, 1);
264 uart_handle_cts_change(port, 0);
266 writel(0, port->membase + UART_IIR);
267 status = readl(port->membase + UART_IIR) & IIR_MASK;
270 spin_unlock_irqrestore(&port->lock,flags);
274 static unsigned int netx_get_mctrl(struct uart_port *port)
276 unsigned int ret = TIOCM_DSR | TIOCM_CAR;
278 if (readl(port->membase + UART_FR) & FR_CTS)
284 static void netx_set_mctrl(struct uart_port *port, unsigned int mctrl)
288 /* FIXME: Locking needed ? */
289 if (mctrl & TIOCM_RTS) {
290 val = readl(port->membase + UART_RTS_CR);
291 writel(val | RTS_CR_RTS, port->membase + UART_RTS_CR);
295 static void netx_break_ctl(struct uart_port *port, int break_state)
297 unsigned int line_cr;
298 spin_lock_irq(&port->lock);
300 line_cr = readl(port->membase + UART_LINE_CR);
301 if (break_state != 0)
302 line_cr |= LINE_CR_BRK;
304 line_cr &= ~LINE_CR_BRK;
305 writel(line_cr, port->membase + UART_LINE_CR);
307 spin_unlock_irq(&port->lock);
310 static int netx_startup(struct uart_port *port)
314 ret = request_irq(port->irq, netx_int, 0,
317 dev_err(port->dev, "unable to grab irq%d\n",port->irq);
321 writel(readl(port->membase + UART_LINE_CR) | LINE_CR_FEN,
322 port->membase + UART_LINE_CR);
324 writel(CR_MSIE | CR_RIE | CR_TIE | CR_RTIE | CR_UART_EN,
325 port->membase + UART_CR);
331 static void netx_shutdown(struct uart_port *port)
333 writel(0, port->membase + UART_CR) ;
335 free_irq(port->irq, port);
339 netx_set_termios(struct uart_port *port, struct ktermios *termios,
340 struct ktermios *old)
342 unsigned int baud, quot;
343 unsigned char old_cr;
344 unsigned char line_cr = LINE_CR_FEN;
345 unsigned char rts_cr = 0;
347 switch (termios->c_cflag & CSIZE) {
349 line_cr |= LINE_CR_5BIT;
352 line_cr |= LINE_CR_6BIT;
355 line_cr |= LINE_CR_7BIT;
358 line_cr |= LINE_CR_8BIT;
362 if (termios->c_cflag & CSTOPB)
363 line_cr |= LINE_CR_STP2;
365 if (termios->c_cflag & PARENB) {
366 line_cr |= LINE_CR_PEN;
367 if (!(termios->c_cflag & PARODD))
368 line_cr |= LINE_CR_EPS;
371 if (termios->c_cflag & CRTSCTS)
372 rts_cr = RTS_CR_AUTO | RTS_CR_CTS_CTR | RTS_CR_RTS_POL;
374 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
380 spin_lock_irq(&port->lock);
382 uart_update_timeout(port, termios->c_cflag, baud);
384 old_cr = readl(port->membase + UART_CR);
386 /* disable interrupts */
387 writel(old_cr & ~(CR_MSIE | CR_RIE | CR_TIE | CR_RTIE),
388 port->membase + UART_CR);
390 /* drain transmitter */
391 while (readl(port->membase + UART_FR) & FR_BUSY);
394 writel(old_cr & ~CR_UART_EN, port->membase + UART_CR);
396 /* modem status interrupts */
398 if (UART_ENABLE_MS(port, termios->c_cflag))
401 writel((quot>>8) & 0xff, port->membase + UART_BAUDDIV_MSB);
402 writel(quot & 0xff, port->membase + UART_BAUDDIV_LSB);
403 writel(line_cr, port->membase + UART_LINE_CR);
405 writel(rts_cr, port->membase + UART_RTS_CR);
408 * Characters to ignore
410 port->ignore_status_mask = 0;
411 if (termios->c_iflag & IGNPAR)
412 port->ignore_status_mask |= SR_PE;
413 if (termios->c_iflag & IGNBRK) {
414 port->ignore_status_mask |= SR_BE;
416 * If we're ignoring parity and break indicators,
417 * ignore overruns too (for real raw support).
419 if (termios->c_iflag & IGNPAR)
420 port->ignore_status_mask |= SR_PE;
423 port->read_status_mask = 0;
424 if (termios->c_iflag & (BRKINT | PARMRK))
425 port->read_status_mask |= SR_BE;
426 if (termios->c_iflag & INPCK)
427 port->read_status_mask |= SR_PE | SR_FE;
429 writel(old_cr, port->membase + UART_CR);
431 spin_unlock_irq(&port->lock);
434 static const char *netx_type(struct uart_port *port)
436 return port->type == PORT_NETX ? "NETX" : NULL;
439 static void netx_release_port(struct uart_port *port)
441 release_mem_region(port->mapbase, UART_PORT_SIZE);
444 static int netx_request_port(struct uart_port *port)
446 return request_mem_region(port->mapbase, UART_PORT_SIZE,
447 DRIVER_NAME) != NULL ? 0 : -EBUSY;
450 static void netx_config_port(struct uart_port *port, int flags)
452 if (flags & UART_CONFIG_TYPE && netx_request_port(port) == 0)
453 port->type = PORT_NETX;
457 netx_verify_port(struct uart_port *port, struct serial_struct *ser)
461 if (ser->type != PORT_UNKNOWN && ser->type != PORT_NETX)
467 static struct uart_ops netx_pops = {
468 .tx_empty = netx_tx_empty,
469 .set_mctrl = netx_set_mctrl,
470 .get_mctrl = netx_get_mctrl,
471 .stop_tx = netx_stop_tx,
472 .start_tx = netx_start_tx,
473 .stop_rx = netx_stop_rx,
474 .enable_ms = netx_enable_ms,
475 .break_ctl = netx_break_ctl,
476 .startup = netx_startup,
477 .shutdown = netx_shutdown,
478 .set_termios = netx_set_termios,
480 .release_port = netx_release_port,
481 .request_port = netx_request_port,
482 .config_port = netx_config_port,
483 .verify_port = netx_verify_port,
486 static struct netx_port netx_ports[] = {
491 .membase = (char __iomem *)io_p2v(NETX_PA_UART0),
492 .mapbase = NETX_PA_UART0,
493 .irq = NETX_IRQ_UART0,
494 .uartclk = 100000000,
496 .flags = UPF_BOOT_AUTOCONF,
504 .membase = (char __iomem *)io_p2v(NETX_PA_UART1),
505 .mapbase = NETX_PA_UART1,
506 .irq = NETX_IRQ_UART1,
507 .uartclk = 100000000,
509 .flags = UPF_BOOT_AUTOCONF,
517 .membase = (char __iomem *)io_p2v(NETX_PA_UART2),
518 .mapbase = NETX_PA_UART2,
519 .irq = NETX_IRQ_UART2,
520 .uartclk = 100000000,
522 .flags = UPF_BOOT_AUTOCONF,
529 #ifdef CONFIG_SERIAL_NETX_CONSOLE
531 static void netx_console_putchar(struct uart_port *port, int ch)
533 while (readl(port->membase + UART_FR) & FR_BUSY);
534 writel(ch, port->membase + UART_DR);
538 netx_console_write(struct console *co, const char *s, unsigned int count)
540 struct uart_port *port = &netx_ports[co->index].port;
541 unsigned char cr_save;
543 cr_save = readl(port->membase + UART_CR);
544 writel(cr_save | CR_UART_EN, port->membase + UART_CR);
546 uart_console_write(port, s, count, netx_console_putchar);
548 while (readl(port->membase + UART_FR) & FR_BUSY);
549 writel(cr_save, port->membase + UART_CR);
553 netx_console_get_options(struct uart_port *port, int *baud,
554 int *parity, int *bits, int *flow)
556 unsigned char line_cr;
558 *baud = (readl(port->membase + UART_BAUDDIV_MSB) << 8) |
559 readl(port->membase + UART_BAUDDIV_LSB);
566 line_cr = readl(port->membase + UART_LINE_CR);
568 if (line_cr & LINE_CR_PEN) {
569 if (line_cr & LINE_CR_EPS)
575 switch (line_cr & LINE_CR_BITS_MASK) {
590 if (readl(port->membase + UART_RTS_CR) & RTS_CR_AUTO)
595 netx_console_setup(struct console *co, char *options)
597 struct netx_port *sport;
604 * Check whether an invalid uart number has been specified, and
605 * if so, search for the first available port that does have
608 if (co->index == -1 || co->index >= ARRAY_SIZE(netx_ports))
610 sport = &netx_ports[co->index];
613 uart_parse_options(options, &baud, &parity, &bits, &flow);
615 /* if the UART is enabled, assume it has been correctly setup
616 * by the bootloader and get the options
618 if (readl(sport->port.membase + UART_CR) & CR_UART_EN) {
619 netx_console_get_options(&sport->port, &baud,
620 &parity, &bits, &flow);
625 return uart_set_options(&sport->port, co, baud, parity, bits, flow);
628 static struct uart_driver netx_reg;
629 static struct console netx_console = {
631 .write = netx_console_write,
632 .device = uart_console_device,
633 .setup = netx_console_setup,
634 .flags = CON_PRINTBUFFER,
639 static int __init netx_console_init(void)
641 register_console(&netx_console);
644 console_initcall(netx_console_init);
646 #define NETX_CONSOLE &netx_console
648 #define NETX_CONSOLE NULL
651 static struct uart_driver netx_reg = {
652 .owner = THIS_MODULE,
653 .driver_name = DRIVER_NAME,
655 .major = SERIAL_NX_MAJOR,
656 .minor = MINOR_START,
657 .nr = ARRAY_SIZE(netx_ports),
658 .cons = NETX_CONSOLE,
661 static int serial_netx_suspend(struct platform_device *pdev, pm_message_t state)
663 struct netx_port *sport = platform_get_drvdata(pdev);
666 uart_suspend_port(&netx_reg, &sport->port);
671 static int serial_netx_resume(struct platform_device *pdev)
673 struct netx_port *sport = platform_get_drvdata(pdev);
676 uart_resume_port(&netx_reg, &sport->port);
681 static int serial_netx_probe(struct platform_device *pdev)
683 struct uart_port *port = &netx_ports[pdev->id].port;
685 dev_info(&pdev->dev, "initialising\n");
687 port->dev = &pdev->dev;
689 writel(1, port->membase + UART_RXFIFO_IRQLEVEL);
690 uart_add_one_port(&netx_reg, &netx_ports[pdev->id].port);
691 platform_set_drvdata(pdev, &netx_ports[pdev->id]);
696 static int serial_netx_remove(struct platform_device *pdev)
698 struct netx_port *sport = platform_get_drvdata(pdev);
700 platform_set_drvdata(pdev, NULL);
703 uart_remove_one_port(&netx_reg, &sport->port);
708 static struct platform_driver serial_netx_driver = {
709 .probe = serial_netx_probe,
710 .remove = serial_netx_remove,
712 .suspend = serial_netx_suspend,
713 .resume = serial_netx_resume,
717 .owner = THIS_MODULE,
721 static int __init netx_serial_init(void)
725 printk(KERN_INFO "Serial: NetX driver\n");
727 ret = uart_register_driver(&netx_reg);
731 ret = platform_driver_register(&serial_netx_driver);
733 uart_unregister_driver(&netx_reg);
738 static void __exit netx_serial_exit(void)
740 platform_driver_unregister(&serial_netx_driver);
741 uart_unregister_driver(&netx_reg);
744 module_init(netx_serial_init);
745 module_exit(netx_serial_exit);
747 MODULE_AUTHOR("Sascha Hauer");
748 MODULE_DESCRIPTION("NetX serial port driver");
749 MODULE_LICENSE("GPL");
750 MODULE_ALIAS("platform:" DRIVER_NAME);