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authorGreg Kroah-Hartman <gregkh@suse.de>2011-01-13 23:10:18 +0300
committerGreg Kroah-Hartman <gregkh@suse.de>2011-01-13 23:10:18 +0300
commitab4382d27412e7e3e7c936e8d50d8888dfac3df8 (patch)
tree51d96dea2431140358784b6b426715f37f74fd53 /drivers/serial/sunhv.c
parent728674a7e466628df2aeec6d11a2ae1ef968fb67 (diff)
downloadlinux-ab4382d27412e7e3e7c936e8d50d8888dfac3df8.tar.xz
tty: move drivers/serial/ to drivers/tty/serial/
The serial drivers are really just tty drivers, so move them to drivers/tty/ to make things a bit neater overall. This is part of the tty/serial driver movement proceedure as proposed by Arnd Bergmann and approved by everyone involved a number of months ago. Cc: Arnd Bergmann <arnd@arndb.de> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Rogier Wolff <R.E.Wolff@bitwizard.nl> Cc: Michael H. Warfield <mhw@wittsend.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/serial/sunhv.c')
-rw-r--r--drivers/serial/sunhv.c661
1 files changed, 0 insertions, 661 deletions
diff --git a/drivers/serial/sunhv.c b/drivers/serial/sunhv.c
deleted file mode 100644
index c9014868297d..000000000000
--- a/drivers/serial/sunhv.c
+++ /dev/null
@@ -1,661 +0,0 @@
-/* sunhv.c: Serial driver for SUN4V hypervisor console.
- *
- * Copyright (C) 2006, 2007 David S. Miller (davem@davemloft.net)
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/major.h>
-#include <linux/circ_buf.h>
-#include <linux/serial.h>
-#include <linux/sysrq.h>
-#include <linux/console.h>
-#include <linux/spinlock.h>
-#include <linux/slab.h>
-#include <linux/delay.h>
-#include <linux/init.h>
-#include <linux/of_device.h>
-
-#include <asm/hypervisor.h>
-#include <asm/spitfire.h>
-#include <asm/prom.h>
-#include <asm/irq.h>
-
-#if defined(CONFIG_MAGIC_SYSRQ)
-#define SUPPORT_SYSRQ
-#endif
-
-#include <linux/serial_core.h>
-
-#include "suncore.h"
-
-#define CON_BREAK ((long)-1)
-#define CON_HUP ((long)-2)
-
-#define IGNORE_BREAK 0x1
-#define IGNORE_ALL 0x2
-
-static char *con_write_page;
-static char *con_read_page;
-
-static int hung_up = 0;
-
-static void transmit_chars_putchar(struct uart_port *port, struct circ_buf *xmit)
-{
- while (!uart_circ_empty(xmit)) {
- long status = sun4v_con_putchar(xmit->buf[xmit->tail]);
-
- if (status != HV_EOK)
- break;
-
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- port->icount.tx++;
- }
-}
-
-static void transmit_chars_write(struct uart_port *port, struct circ_buf *xmit)
-{
- while (!uart_circ_empty(xmit)) {
- unsigned long ra = __pa(xmit->buf + xmit->tail);
- unsigned long len, status, sent;
-
- len = CIRC_CNT_TO_END(xmit->head, xmit->tail,
- UART_XMIT_SIZE);
- status = sun4v_con_write(ra, len, &sent);
- if (status != HV_EOK)
- break;
- xmit->tail = (xmit->tail + sent) & (UART_XMIT_SIZE - 1);
- port->icount.tx += sent;
- }
-}
-
-static int receive_chars_getchar(struct uart_port *port, struct tty_struct *tty)
-{
- int saw_console_brk = 0;
- int limit = 10000;
-
- while (limit-- > 0) {
- long status;
- long c = sun4v_con_getchar(&status);
-
- if (status == HV_EWOULDBLOCK)
- break;
-
- if (c == CON_BREAK) {
- if (uart_handle_break(port))
- continue;
- saw_console_brk = 1;
- c = 0;
- }
-
- if (c == CON_HUP) {
- hung_up = 1;
- uart_handle_dcd_change(port, 0);
- } else if (hung_up) {
- hung_up = 0;
- uart_handle_dcd_change(port, 1);
- }
-
- if (tty == NULL) {
- uart_handle_sysrq_char(port, c);
- continue;
- }
-
- port->icount.rx++;
-
- if (uart_handle_sysrq_char(port, c))
- continue;
-
- tty_insert_flip_char(tty, c, TTY_NORMAL);
- }
-
- return saw_console_brk;
-}
-
-static int receive_chars_read(struct uart_port *port, struct tty_struct *tty)
-{
- int saw_console_brk = 0;
- int limit = 10000;
-
- while (limit-- > 0) {
- unsigned long ra = __pa(con_read_page);
- unsigned long bytes_read, i;
- long stat = sun4v_con_read(ra, PAGE_SIZE, &bytes_read);
-
- if (stat != HV_EOK) {
- bytes_read = 0;
-
- if (stat == CON_BREAK) {
- if (uart_handle_break(port))
- continue;
- saw_console_brk = 1;
- *con_read_page = 0;
- bytes_read = 1;
- } else if (stat == CON_HUP) {
- hung_up = 1;
- uart_handle_dcd_change(port, 0);
- continue;
- } else {
- /* HV_EWOULDBLOCK, etc. */
- break;
- }
- }
-
- if (hung_up) {
- hung_up = 0;
- uart_handle_dcd_change(port, 1);
- }
-
- for (i = 0; i < bytes_read; i++)
- uart_handle_sysrq_char(port, con_read_page[i]);
-
- if (tty == NULL)
- continue;
-
- port->icount.rx += bytes_read;
-
- tty_insert_flip_string(tty, con_read_page, bytes_read);
- }
-
- return saw_console_brk;
-}
-
-struct sunhv_ops {
- void (*transmit_chars)(struct uart_port *port, struct circ_buf *xmit);
- int (*receive_chars)(struct uart_port *port, struct tty_struct *tty);
-};
-
-static struct sunhv_ops bychar_ops = {
- .transmit_chars = transmit_chars_putchar,
- .receive_chars = receive_chars_getchar,
-};
-
-static struct sunhv_ops bywrite_ops = {
- .transmit_chars = transmit_chars_write,
- .receive_chars = receive_chars_read,
-};
-
-static struct sunhv_ops *sunhv_ops = &bychar_ops;
-
-static struct tty_struct *receive_chars(struct uart_port *port)
-{
- struct tty_struct *tty = NULL;
-
- if (port->state != NULL) /* Unopened serial console */
- tty = port->state->port.tty;
-
- if (sunhv_ops->receive_chars(port, tty))
- sun_do_break();
-
- return tty;
-}
-
-static void transmit_chars(struct uart_port *port)
-{
- struct circ_buf *xmit;
-
- if (!port->state)
- return;
-
- xmit = &port->state->xmit;
- if (uart_circ_empty(xmit) || uart_tx_stopped(port))
- return;
-
- sunhv_ops->transmit_chars(port, xmit);
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(port);
-}
-
-static irqreturn_t sunhv_interrupt(int irq, void *dev_id)
-{
- struct uart_port *port = dev_id;
- struct tty_struct *tty;
- unsigned long flags;
-
- spin_lock_irqsave(&port->lock, flags);
- tty = receive_chars(port);
- transmit_chars(port);
- spin_unlock_irqrestore(&port->lock, flags);
-
- if (tty)
- tty_flip_buffer_push(tty);
-
- return IRQ_HANDLED;
-}
-
-/* port->lock is not held. */
-static unsigned int sunhv_tx_empty(struct uart_port *port)
-{
- /* Transmitter is always empty for us. If the circ buffer
- * is non-empty or there is an x_char pending, our caller
- * will do the right thing and ignore what we return here.
- */
- return TIOCSER_TEMT;
-}
-
-/* port->lock held by caller. */
-static void sunhv_set_mctrl(struct uart_port *port, unsigned int mctrl)
-{
- return;
-}
-
-/* port->lock is held by caller and interrupts are disabled. */
-static unsigned int sunhv_get_mctrl(struct uart_port *port)
-{
- return TIOCM_DSR | TIOCM_CAR | TIOCM_CTS;
-}
-
-/* port->lock held by caller. */
-static void sunhv_stop_tx(struct uart_port *port)
-{
- return;
-}
-
-/* port->lock held by caller. */
-static void sunhv_start_tx(struct uart_port *port)
-{
- transmit_chars(port);
-}
-
-/* port->lock is not held. */
-static void sunhv_send_xchar(struct uart_port *port, char ch)
-{
- unsigned long flags;
- int limit = 10000;
-
- spin_lock_irqsave(&port->lock, flags);
-
- while (limit-- > 0) {
- long status = sun4v_con_putchar(ch);
- if (status == HV_EOK)
- break;
- udelay(1);
- }
-
- spin_unlock_irqrestore(&port->lock, flags);
-}
-
-/* port->lock held by caller. */
-static void sunhv_stop_rx(struct uart_port *port)
-{
-}
-
-/* port->lock held by caller. */
-static void sunhv_enable_ms(struct uart_port *port)
-{
-}
-
-/* port->lock is not held. */
-static void sunhv_break_ctl(struct uart_port *port, int break_state)
-{
- if (break_state) {
- unsigned long flags;
- int limit = 10000;
-
- spin_lock_irqsave(&port->lock, flags);
-
- while (limit-- > 0) {
- long status = sun4v_con_putchar(CON_BREAK);
- if (status == HV_EOK)
- break;
- udelay(1);
- }
-
- spin_unlock_irqrestore(&port->lock, flags);
- }
-}
-
-/* port->lock is not held. */
-static int sunhv_startup(struct uart_port *port)
-{
- return 0;
-}
-
-/* port->lock is not held. */
-static void sunhv_shutdown(struct uart_port *port)
-{
-}
-
-/* port->lock is not held. */
-static void sunhv_set_termios(struct uart_port *port, struct ktermios *termios,
- struct ktermios *old)
-{
- unsigned int baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
- unsigned int quot = uart_get_divisor(port, baud);
- unsigned int iflag, cflag;
- unsigned long flags;
-
- spin_lock_irqsave(&port->lock, flags);
-
- iflag = termios->c_iflag;
- cflag = termios->c_cflag;
-
- port->ignore_status_mask = 0;
- if (iflag & IGNBRK)
- port->ignore_status_mask |= IGNORE_BREAK;
- if ((cflag & CREAD) == 0)
- port->ignore_status_mask |= IGNORE_ALL;
-
- /* XXX */
- uart_update_timeout(port, cflag,
- (port->uartclk / (16 * quot)));
-
- spin_unlock_irqrestore(&port->lock, flags);
-}
-
-static const char *sunhv_type(struct uart_port *port)
-{
- return "SUN4V HCONS";
-}
-
-static void sunhv_release_port(struct uart_port *port)
-{
-}
-
-static int sunhv_request_port(struct uart_port *port)
-{
- return 0;
-}
-
-static void sunhv_config_port(struct uart_port *port, int flags)
-{
-}
-
-static int sunhv_verify_port(struct uart_port *port, struct serial_struct *ser)
-{
- return -EINVAL;
-}
-
-static struct uart_ops sunhv_pops = {
- .tx_empty = sunhv_tx_empty,
- .set_mctrl = sunhv_set_mctrl,
- .get_mctrl = sunhv_get_mctrl,
- .stop_tx = sunhv_stop_tx,
- .start_tx = sunhv_start_tx,
- .send_xchar = sunhv_send_xchar,
- .stop_rx = sunhv_stop_rx,
- .enable_ms = sunhv_enable_ms,
- .break_ctl = sunhv_break_ctl,
- .startup = sunhv_startup,
- .shutdown = sunhv_shutdown,
- .set_termios = sunhv_set_termios,
- .type = sunhv_type,
- .release_port = sunhv_release_port,
- .request_port = sunhv_request_port,
- .config_port = sunhv_config_port,
- .verify_port = sunhv_verify_port,
-};
-
-static struct uart_driver sunhv_reg = {
- .owner = THIS_MODULE,
- .driver_name = "sunhv",
- .dev_name = "ttyS",
- .major = TTY_MAJOR,
-};
-
-static struct uart_port *sunhv_port;
-
-/* Copy 's' into the con_write_page, decoding "\n" into
- * "\r\n" along the way. We have to return two lengths
- * because the caller needs to know how much to advance
- * 's' and also how many bytes to output via con_write_page.
- */
-static int fill_con_write_page(const char *s, unsigned int n,
- unsigned long *page_bytes)
-{
- const char *orig_s = s;
- char *p = con_write_page;
- int left = PAGE_SIZE;
-
- while (n--) {
- if (*s == '\n') {
- if (left < 2)
- break;
- *p++ = '\r';
- left--;
- } else if (left < 1)
- break;
- *p++ = *s++;
- left--;
- }
- *page_bytes = p - con_write_page;
- return s - orig_s;
-}
-
-static void sunhv_console_write_paged(struct console *con, const char *s, unsigned n)
-{
- struct uart_port *port = sunhv_port;
- unsigned long flags;
- int locked = 1;
-
- local_irq_save(flags);
- if (port->sysrq) {
- locked = 0;
- } else if (oops_in_progress) {
- locked = spin_trylock(&port->lock);
- } else
- spin_lock(&port->lock);
-
- while (n > 0) {
- unsigned long ra = __pa(con_write_page);
- unsigned long page_bytes;
- unsigned int cpy = fill_con_write_page(s, n,
- &page_bytes);
-
- n -= cpy;
- s += cpy;
- while (page_bytes > 0) {
- unsigned long written;
- int limit = 1000000;
-
- while (limit--) {
- unsigned long stat;
-
- stat = sun4v_con_write(ra, page_bytes,
- &written);
- if (stat == HV_EOK)
- break;
- udelay(1);
- }
- if (limit < 0)
- break;
- page_bytes -= written;
- ra += written;
- }
- }
-
- if (locked)
- spin_unlock(&port->lock);
- local_irq_restore(flags);
-}
-
-static inline void sunhv_console_putchar(struct uart_port *port, char c)
-{
- int limit = 1000000;
-
- while (limit-- > 0) {
- long status = sun4v_con_putchar(c);
- if (status == HV_EOK)
- break;
- udelay(1);
- }
-}
-
-static void sunhv_console_write_bychar(struct console *con, const char *s, unsigned n)
-{
- struct uart_port *port = sunhv_port;
- unsigned long flags;
- int i, locked = 1;
-
- local_irq_save(flags);
- if (port->sysrq) {
- locked = 0;
- } else if (oops_in_progress) {
- locked = spin_trylock(&port->lock);
- } else
- spin_lock(&port->lock);
-
- for (i = 0; i < n; i++) {
- if (*s == '\n')
- sunhv_console_putchar(port, '\r');
- sunhv_console_putchar(port, *s++);
- }
-
- if (locked)
- spin_unlock(&port->lock);
- local_irq_restore(flags);
-}
-
-static struct console sunhv_console = {
- .name = "ttyHV",
- .write = sunhv_console_write_bychar,
- .device = uart_console_device,
- .flags = CON_PRINTBUFFER,
- .index = -1,
- .data = &sunhv_reg,
-};
-
-static int __devinit hv_probe(struct platform_device *op, const struct of_device_id *match)
-{
- struct uart_port *port;
- unsigned long minor;
- int err;
-
- if (op->archdata.irqs[0] == 0xffffffff)
- return -ENODEV;
-
- port = kzalloc(sizeof(struct uart_port), GFP_KERNEL);
- if (unlikely(!port))
- return -ENOMEM;
-
- minor = 1;
- if (sun4v_hvapi_register(HV_GRP_CORE, 1, &minor) == 0 &&
- minor >= 1) {
- err = -ENOMEM;
- con_write_page = kzalloc(PAGE_SIZE, GFP_KERNEL);
- if (!con_write_page)
- goto out_free_port;
-
- con_read_page = kzalloc(PAGE_SIZE, GFP_KERNEL);
- if (!con_read_page)
- goto out_free_con_write_page;
-
- sunhv_console.write = sunhv_console_write_paged;
- sunhv_ops = &bywrite_ops;
- }
-
- sunhv_port = port;
-
- port->line = 0;
- port->ops = &sunhv_pops;
- port->type = PORT_SUNHV;
- port->uartclk = ( 29491200 / 16 ); /* arbitrary */
-
- port->membase = (unsigned char __iomem *) __pa(port);
-
- port->irq = op->archdata.irqs[0];
-
- port->dev = &op->dev;
-
- err = sunserial_register_minors(&sunhv_reg, 1);
- if (err)
- goto out_free_con_read_page;
-
- sunserial_console_match(&sunhv_console, op->dev.of_node,
- &sunhv_reg, port->line, false);
-
- err = uart_add_one_port(&sunhv_reg, port);
- if (err)
- goto out_unregister_driver;
-
- err = request_irq(port->irq, sunhv_interrupt, 0, "hvcons", port);
- if (err)
- goto out_remove_port;
-
- dev_set_drvdata(&op->dev, port);
-
- return 0;
-
-out_remove_port:
- uart_remove_one_port(&sunhv_reg, port);
-
-out_unregister_driver:
- sunserial_unregister_minors(&sunhv_reg, 1);
-
-out_free_con_read_page:
- kfree(con_read_page);
-
-out_free_con_write_page:
- kfree(con_write_page);
-
-out_free_port:
- kfree(port);
- sunhv_port = NULL;
- return err;
-}
-
-static int __devexit hv_remove(struct platform_device *dev)
-{
- struct uart_port *port = dev_get_drvdata(&dev->dev);
-
- free_irq(port->irq, port);
-
- uart_remove_one_port(&sunhv_reg, port);
-
- sunserial_unregister_minors(&sunhv_reg, 1);
-
- kfree(port);
- sunhv_port = NULL;
-
- dev_set_drvdata(&dev->dev, NULL);
-
- return 0;
-}
-
-static const struct of_device_id hv_match[] = {
- {
- .name = "console",
- .compatible = "qcn",
- },
- {
- .name = "console",
- .compatible = "SUNW,sun4v-console",
- },
- {},
-};
-MODULE_DEVICE_TABLE(of, hv_match);
-
-static struct of_platform_driver hv_driver = {
- .driver = {
- .name = "hv",
- .owner = THIS_MODULE,
- .of_match_table = hv_match,
- },
- .probe = hv_probe,
- .remove = __devexit_p(hv_remove),
-};
-
-static int __init sunhv_init(void)
-{
- if (tlb_type != hypervisor)
- return -ENODEV;
-
- return of_register_platform_driver(&hv_driver);
-}
-
-static void __exit sunhv_exit(void)
-{
- of_unregister_platform_driver(&hv_driver);
-}
-
-module_init(sunhv_init);
-module_exit(sunhv_exit);
-
-MODULE_AUTHOR("David S. Miller");
-MODULE_DESCRIPTION("SUN4V Hypervisor console driver");
-MODULE_VERSION("2.0");
-MODULE_LICENSE("GPL");