2 * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2
6 * as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 #if defined(CONFIG_SERIAL_NETX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
22 #include <linux/device.h>
23 #include <linux/module.h>
24 #include <linux/ioport.h>
25 #include <linux/init.h>
26 #include <linux/console.h>
27 #include <linux/sysrq.h>
28 #include <linux/platform_device.h>
29 #include <linux/tty.h>
30 #include <linux/tty_flip.h>
31 #include <linux/serial_core.h>
32 #include <linux/serial.h>
36 #include <mach/hardware.h>
37 #include <mach/netx-regs.h>
39 /* We've been assigned a range on the "Low-density serial ports" major */
40 #define SERIAL_NX_MAJOR 204
41 #define MINOR_START 170
47 UART_BAUDDIV_MSB = 0x0c,
48 UART_BAUDDIV_LSB = 0x10,
55 UART_RTS_TRAIL = 0x2c,
56 UART_DRV_ENABLE = 0x30,
58 UART_RXFIFO_IRQLEVEL = 0x38,
59 UART_TXFIFO_IRQLEVEL = 0x3c,
67 #define LINE_CR_BRK (1<<0)
68 #define LINE_CR_PEN (1<<1)
69 #define LINE_CR_EPS (1<<2)
70 #define LINE_CR_STP2 (1<<3)
71 #define LINE_CR_FEN (1<<4)
72 #define LINE_CR_5BIT (0<<5)
73 #define LINE_CR_6BIT (1<<5)
74 #define LINE_CR_7BIT (2<<5)
75 #define LINE_CR_8BIT (3<<5)
76 #define LINE_CR_BITS_MASK (3<<5)
78 #define CR_UART_EN (1<<0)
79 #define CR_SIREN (1<<1)
80 #define CR_SIRLP (1<<2)
81 #define CR_MSIE (1<<3)
84 #define CR_RTIE (1<<6)
90 #define FR_BUSY (1<<3)
91 #define FR_RXFE (1<<4)
92 #define FR_TXFF (1<<5)
93 #define FR_RXFF (1<<6)
94 #define FR_TXFE (1<<7)
96 #define IIR_MIS (1<<0)
97 #define IIR_RIS (1<<1)
98 #define IIR_TIS (1<<2)
99 #define IIR_RTIS (1<<3)
102 #define RTS_CR_AUTO (1<<0)
103 #define RTS_CR_RTS (1<<1)
104 #define RTS_CR_COUNT (1<<2)
105 #define RTS_CR_MOD2 (1<<3)
106 #define RTS_CR_RTS_POL (1<<4)
107 #define RTS_CR_CTS_CTR (1<<5)
108 #define RTS_CR_CTS_POL (1<<6)
109 #define RTS_CR_STICK (1<<7)
111 #define UART_PORT_SIZE 0x40
112 #define DRIVER_NAME "netx-uart"
115 struct uart_port port;
118 static void netx_stop_tx(struct uart_port *port)
121 val = readl(port->membase + UART_CR);
122 writel(val & ~CR_TIE, port->membase + UART_CR);
125 static void netx_stop_rx(struct uart_port *port)
128 val = readl(port->membase + UART_CR);
129 writel(val & ~CR_RIE, port->membase + UART_CR);
132 static void netx_enable_ms(struct uart_port *port)
135 val = readl(port->membase + UART_CR);
136 writel(val | CR_MSIE, port->membase + UART_CR);
139 static inline void netx_transmit_buffer(struct uart_port *port)
141 struct circ_buf *xmit = &port->state->xmit;
144 writel(port->x_char, port->membase + UART_DR);
150 if (uart_tx_stopped(port) || uart_circ_empty(xmit)) {
156 /* send xmit->buf[xmit->tail]
157 * out the port here */
158 writel(xmit->buf[xmit->tail], port->membase + UART_DR);
159 xmit->tail = (xmit->tail + 1) &
160 (UART_XMIT_SIZE - 1);
162 if (uart_circ_empty(xmit))
164 } while (!(readl(port->membase + UART_FR) & FR_TXFF));
166 if (uart_circ_empty(xmit))
170 static void netx_start_tx(struct uart_port *port)
173 readl(port->membase + UART_CR) | CR_TIE, port->membase + UART_CR);
175 if (!(readl(port->membase + UART_FR) & FR_TXFF))
176 netx_transmit_buffer(port);
179 static unsigned int netx_tx_empty(struct uart_port *port)
181 return readl(port->membase + UART_FR) & FR_BUSY ? 0 : TIOCSER_TEMT;
184 static void netx_txint(struct uart_port *port)
186 struct circ_buf *xmit = &port->state->xmit;
188 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
193 netx_transmit_buffer(port);
195 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
196 uart_write_wakeup(port);
199 static void netx_rxint(struct uart_port *port, unsigned long *flags)
201 unsigned char rx, flg, status;
203 while (!(readl(port->membase + UART_FR) & FR_RXFE)) {
204 rx = readl(port->membase + UART_DR);
207 status = readl(port->membase + UART_SR);
208 if (status & SR_BE) {
209 writel(0, port->membase + UART_SR);
210 if (uart_handle_break(port))
214 if (unlikely(status & (SR_FE | SR_PE | SR_OE))) {
217 port->icount.parity++;
218 else if (status & SR_FE)
219 port->icount.frame++;
221 port->icount.overrun++;
223 status &= port->read_status_mask;
227 else if (status & SR_PE)
229 else if (status & SR_FE)
233 if (uart_handle_sysrq_char(port, rx))
236 uart_insert_char(port, status, SR_OE, rx, flg);
239 spin_unlock_irqrestore(&port->lock, *flags);
240 tty_flip_buffer_push(&port->state->port);
241 spin_lock_irqsave(&port->lock, *flags);
244 static irqreturn_t netx_int(int irq, void *dev_id)
246 struct uart_port *port = dev_id;
248 unsigned char status;
250 spin_lock_irqsave(&port->lock,flags);
252 status = readl(port->membase + UART_IIR) & IIR_MASK;
254 if (status & IIR_RIS)
255 netx_rxint(port, &flags);
256 if (status & IIR_TIS)
258 if (status & IIR_MIS) {
259 if (readl(port->membase + UART_FR) & FR_CTS)
260 uart_handle_cts_change(port, 1);
262 uart_handle_cts_change(port, 0);
264 writel(0, port->membase + UART_IIR);
265 status = readl(port->membase + UART_IIR) & IIR_MASK;
268 spin_unlock_irqrestore(&port->lock,flags);
272 static unsigned int netx_get_mctrl(struct uart_port *port)
274 unsigned int ret = TIOCM_DSR | TIOCM_CAR;
276 if (readl(port->membase + UART_FR) & FR_CTS)
282 static void netx_set_mctrl(struct uart_port *port, unsigned int mctrl)
286 /* FIXME: Locking needed ? */
287 if (mctrl & TIOCM_RTS) {
288 val = readl(port->membase + UART_RTS_CR);
289 writel(val | RTS_CR_RTS, port->membase + UART_RTS_CR);
293 static void netx_break_ctl(struct uart_port *port, int break_state)
295 unsigned int line_cr;
296 spin_lock_irq(&port->lock);
298 line_cr = readl(port->membase + UART_LINE_CR);
299 if (break_state != 0)
300 line_cr |= LINE_CR_BRK;
302 line_cr &= ~LINE_CR_BRK;
303 writel(line_cr, port->membase + UART_LINE_CR);
305 spin_unlock_irq(&port->lock);
308 static int netx_startup(struct uart_port *port)
312 ret = request_irq(port->irq, netx_int, 0,
315 dev_err(port->dev, "unable to grab irq%d\n",port->irq);
319 writel(readl(port->membase + UART_LINE_CR) | LINE_CR_FEN,
320 port->membase + UART_LINE_CR);
322 writel(CR_MSIE | CR_RIE | CR_TIE | CR_RTIE | CR_UART_EN,
323 port->membase + UART_CR);
329 static void netx_shutdown(struct uart_port *port)
331 writel(0, port->membase + UART_CR) ;
333 free_irq(port->irq, port);
337 netx_set_termios(struct uart_port *port, struct ktermios *termios,
338 struct ktermios *old)
340 unsigned int baud, quot;
341 unsigned char old_cr;
342 unsigned char line_cr = LINE_CR_FEN;
343 unsigned char rts_cr = 0;
345 switch (termios->c_cflag & CSIZE) {
347 line_cr |= LINE_CR_5BIT;
350 line_cr |= LINE_CR_6BIT;
353 line_cr |= LINE_CR_7BIT;
356 line_cr |= LINE_CR_8BIT;
360 if (termios->c_cflag & CSTOPB)
361 line_cr |= LINE_CR_STP2;
363 if (termios->c_cflag & PARENB) {
364 line_cr |= LINE_CR_PEN;
365 if (!(termios->c_cflag & PARODD))
366 line_cr |= LINE_CR_EPS;
369 if (termios->c_cflag & CRTSCTS)
370 rts_cr = RTS_CR_AUTO | RTS_CR_CTS_CTR | RTS_CR_RTS_POL;
372 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
378 spin_lock_irq(&port->lock);
380 uart_update_timeout(port, termios->c_cflag, baud);
382 old_cr = readl(port->membase + UART_CR);
384 /* disable interrupts */
385 writel(old_cr & ~(CR_MSIE | CR_RIE | CR_TIE | CR_RTIE),
386 port->membase + UART_CR);
388 /* drain transmitter */
389 while (readl(port->membase + UART_FR) & FR_BUSY);
392 writel(old_cr & ~CR_UART_EN, port->membase + UART_CR);
394 /* modem status interrupts */
396 if (UART_ENABLE_MS(port, termios->c_cflag))
399 writel((quot>>8) & 0xff, port->membase + UART_BAUDDIV_MSB);
400 writel(quot & 0xff, port->membase + UART_BAUDDIV_LSB);
401 writel(line_cr, port->membase + UART_LINE_CR);
403 writel(rts_cr, port->membase + UART_RTS_CR);
406 * Characters to ignore
408 port->ignore_status_mask = 0;
409 if (termios->c_iflag & IGNPAR)
410 port->ignore_status_mask |= SR_PE;
411 if (termios->c_iflag & IGNBRK) {
412 port->ignore_status_mask |= SR_BE;
414 * If we're ignoring parity and break indicators,
415 * ignore overruns too (for real raw support).
417 if (termios->c_iflag & IGNPAR)
418 port->ignore_status_mask |= SR_PE;
421 port->read_status_mask = 0;
422 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
423 port->read_status_mask |= SR_BE;
424 if (termios->c_iflag & INPCK)
425 port->read_status_mask |= SR_PE | SR_FE;
427 writel(old_cr, port->membase + UART_CR);
429 spin_unlock_irq(&port->lock);
432 static const char *netx_type(struct uart_port *port)
434 return port->type == PORT_NETX ? "NETX" : NULL;
437 static void netx_release_port(struct uart_port *port)
439 release_mem_region(port->mapbase, UART_PORT_SIZE);
442 static int netx_request_port(struct uart_port *port)
444 return request_mem_region(port->mapbase, UART_PORT_SIZE,
445 DRIVER_NAME) != NULL ? 0 : -EBUSY;
448 static void netx_config_port(struct uart_port *port, int flags)
450 if (flags & UART_CONFIG_TYPE && netx_request_port(port) == 0)
451 port->type = PORT_NETX;
455 netx_verify_port(struct uart_port *port, struct serial_struct *ser)
459 if (ser->type != PORT_UNKNOWN && ser->type != PORT_NETX)
465 static struct uart_ops netx_pops = {
466 .tx_empty = netx_tx_empty,
467 .set_mctrl = netx_set_mctrl,
468 .get_mctrl = netx_get_mctrl,
469 .stop_tx = netx_stop_tx,
470 .start_tx = netx_start_tx,
471 .stop_rx = netx_stop_rx,
472 .enable_ms = netx_enable_ms,
473 .break_ctl = netx_break_ctl,
474 .startup = netx_startup,
475 .shutdown = netx_shutdown,
476 .set_termios = netx_set_termios,
478 .release_port = netx_release_port,
479 .request_port = netx_request_port,
480 .config_port = netx_config_port,
481 .verify_port = netx_verify_port,
484 static struct netx_port netx_ports[] = {
489 .membase = (char __iomem *)io_p2v(NETX_PA_UART0),
490 .mapbase = NETX_PA_UART0,
491 .irq = NETX_IRQ_UART0,
492 .uartclk = 100000000,
494 .flags = UPF_BOOT_AUTOCONF,
502 .membase = (char __iomem *)io_p2v(NETX_PA_UART1),
503 .mapbase = NETX_PA_UART1,
504 .irq = NETX_IRQ_UART1,
505 .uartclk = 100000000,
507 .flags = UPF_BOOT_AUTOCONF,
515 .membase = (char __iomem *)io_p2v(NETX_PA_UART2),
516 .mapbase = NETX_PA_UART2,
517 .irq = NETX_IRQ_UART2,
518 .uartclk = 100000000,
520 .flags = UPF_BOOT_AUTOCONF,
527 #ifdef CONFIG_SERIAL_NETX_CONSOLE
529 static void netx_console_putchar(struct uart_port *port, int ch)
531 while (readl(port->membase + UART_FR) & FR_BUSY);
532 writel(ch, port->membase + UART_DR);
536 netx_console_write(struct console *co, const char *s, unsigned int count)
538 struct uart_port *port = &netx_ports[co->index].port;
539 unsigned char cr_save;
541 cr_save = readl(port->membase + UART_CR);
542 writel(cr_save | CR_UART_EN, port->membase + UART_CR);
544 uart_console_write(port, s, count, netx_console_putchar);
546 while (readl(port->membase + UART_FR) & FR_BUSY);
547 writel(cr_save, port->membase + UART_CR);
551 netx_console_get_options(struct uart_port *port, int *baud,
552 int *parity, int *bits, int *flow)
554 unsigned char line_cr;
556 *baud = (readl(port->membase + UART_BAUDDIV_MSB) << 8) |
557 readl(port->membase + UART_BAUDDIV_LSB);
564 line_cr = readl(port->membase + UART_LINE_CR);
566 if (line_cr & LINE_CR_PEN) {
567 if (line_cr & LINE_CR_EPS)
573 switch (line_cr & LINE_CR_BITS_MASK) {
588 if (readl(port->membase + UART_RTS_CR) & RTS_CR_AUTO)
593 netx_console_setup(struct console *co, char *options)
595 struct netx_port *sport;
602 * Check whether an invalid uart number has been specified, and
603 * if so, search for the first available port that does have
606 if (co->index == -1 || co->index >= ARRAY_SIZE(netx_ports))
608 sport = &netx_ports[co->index];
611 uart_parse_options(options, &baud, &parity, &bits, &flow);
613 /* if the UART is enabled, assume it has been correctly setup
614 * by the bootloader and get the options
616 if (readl(sport->port.membase + UART_CR) & CR_UART_EN) {
617 netx_console_get_options(&sport->port, &baud,
618 &parity, &bits, &flow);
623 return uart_set_options(&sport->port, co, baud, parity, bits, flow);
626 static struct uart_driver netx_reg;
627 static struct console netx_console = {
629 .write = netx_console_write,
630 .device = uart_console_device,
631 .setup = netx_console_setup,
632 .flags = CON_PRINTBUFFER,
637 static int __init netx_console_init(void)
639 register_console(&netx_console);
642 console_initcall(netx_console_init);
644 #define NETX_CONSOLE &netx_console
646 #define NETX_CONSOLE NULL
649 static struct uart_driver netx_reg = {
650 .owner = THIS_MODULE,
651 .driver_name = DRIVER_NAME,
653 .major = SERIAL_NX_MAJOR,
654 .minor = MINOR_START,
655 .nr = ARRAY_SIZE(netx_ports),
656 .cons = NETX_CONSOLE,
659 static int serial_netx_suspend(struct platform_device *pdev, pm_message_t state)
661 struct netx_port *sport = platform_get_drvdata(pdev);
664 uart_suspend_port(&netx_reg, &sport->port);
669 static int serial_netx_resume(struct platform_device *pdev)
671 struct netx_port *sport = platform_get_drvdata(pdev);
674 uart_resume_port(&netx_reg, &sport->port);
679 static int serial_netx_probe(struct platform_device *pdev)
681 struct uart_port *port = &netx_ports[pdev->id].port;
683 dev_info(&pdev->dev, "initialising\n");
685 port->dev = &pdev->dev;
687 writel(1, port->membase + UART_RXFIFO_IRQLEVEL);
688 uart_add_one_port(&netx_reg, &netx_ports[pdev->id].port);
689 platform_set_drvdata(pdev, &netx_ports[pdev->id]);
694 static int serial_netx_remove(struct platform_device *pdev)
696 struct netx_port *sport = platform_get_drvdata(pdev);
699 uart_remove_one_port(&netx_reg, &sport->port);
704 static struct platform_driver serial_netx_driver = {
705 .probe = serial_netx_probe,
706 .remove = serial_netx_remove,
708 .suspend = serial_netx_suspend,
709 .resume = serial_netx_resume,
716 static int __init netx_serial_init(void)
720 printk(KERN_INFO "Serial: NetX driver\n");
722 ret = uart_register_driver(&netx_reg);
726 ret = platform_driver_register(&serial_netx_driver);
728 uart_unregister_driver(&netx_reg);
733 static void __exit netx_serial_exit(void)
735 platform_driver_unregister(&serial_netx_driver);
736 uart_unregister_driver(&netx_reg);
739 module_init(netx_serial_init);
740 module_exit(netx_serial_exit);
742 MODULE_AUTHOR("Sascha Hauer");
743 MODULE_DESCRIPTION("NetX serial port driver");
744 MODULE_LICENSE("GPL");
745 MODULE_ALIAS("platform:" DRIVER_NAME);