diff options
Diffstat (limited to 'drivers/serial/mux.c')
| -rw-r--r-- | drivers/serial/mux.c | 633 |
1 files changed, 0 insertions, 633 deletions
diff --git a/drivers/serial/mux.c b/drivers/serial/mux.c deleted file mode 100644 index 9711e06a837..00000000000 --- a/drivers/serial/mux.c +++ /dev/null @@ -1,633 +0,0 @@ -/* -** mux.c: -** serial driver for the Mux console found in some PA-RISC servers. -** -** (c) Copyright 2002 Ryan Bradetich -** (c) Copyright 2002 Hewlett-Packard Company -** -** This program is free software; you can redistribute it and/or modify -** it under the terms of the GNU General Public License as published by -** the Free Software Foundation; either version 2 of the License, or -** (at your option) any later version. -** -** This Driver currently only supports the console (port 0) on the MUX. -** Additional work will be needed on this driver to enable the full -** functionality of the MUX. -** -*/ - -#include <linux/module.h> -#include <linux/tty.h> -#include <linux/ioport.h> -#include <linux/init.h> -#include <linux/serial.h> -#include <linux/console.h> -#include <linux/delay.h> /* for udelay */ -#include <linux/device.h> -#include <asm/io.h> -#include <asm/irq.h> -#include <asm/parisc-device.h> - -#ifdef CONFIG_MAGIC_SYSRQ -#include <linux/sysrq.h> -#define SUPPORT_SYSRQ -#endif - -#include <linux/serial_core.h> - -#define MUX_OFFSET 0x800 -#define MUX_LINE_OFFSET 0x80 - -#define MUX_FIFO_SIZE 255 -#define MUX_POLL_DELAY (30 * HZ / 1000) - -#define IO_DATA_REG_OFFSET 0x3c -#define IO_DCOUNT_REG_OFFSET 0x40 - -#define MUX_EOFIFO(status) ((status & 0xF000) == 0xF000) -#define MUX_STATUS(status) ((status & 0xF000) == 0x8000) -#define MUX_BREAK(status) ((status & 0xF000) == 0x2000) - -#define MUX_NR 256 -static unsigned int port_cnt __read_mostly; -struct mux_port { - struct uart_port port; - int enabled; -}; -static struct mux_port mux_ports[MUX_NR]; - -static struct uart_driver mux_driver = { - .owner = THIS_MODULE, - .driver_name = "ttyB", - .dev_name = "ttyB", - .major = MUX_MAJOR, - .minor = 0, - .nr = MUX_NR, -}; - -static struct timer_list mux_timer; - -#define UART_PUT_CHAR(p, c) __raw_writel((c), (p)->membase + IO_DATA_REG_OFFSET) -#define UART_GET_FIFO_CNT(p) __raw_readl((p)->membase + IO_DCOUNT_REG_OFFSET) - -/** - * get_mux_port_count - Get the number of available ports on the Mux. - * @dev: The parisc device. - * - * This function is used to determine the number of ports the Mux - * supports. The IODC data reports the number of ports the Mux - * can support, but there are cases where not all the Mux ports - * are connected. This function can override the IODC and - * return the true port count. - */ -static int __init get_mux_port_count(struct parisc_device *dev) -{ - int status; - u8 iodc_data[32]; - unsigned long bytecnt; - - /* If this is the built-in Mux for the K-Class (Eole CAP/MUX), - * we only need to allocate resources for 1 port since the - * other 7 ports are not connected. - */ - if(dev->id.hversion == 0x15) - return 1; - - status = pdc_iodc_read(&bytecnt, dev->hpa.start, 0, iodc_data, 32); - BUG_ON(status != PDC_OK); - - /* Return the number of ports specified in the iodc data. */ - return ((((iodc_data)[4] & 0xf0) >> 4) * 8) + 8; -} - -/** - * mux_tx_empty - Check if the transmitter fifo is empty. - * @port: Ptr to the uart_port. - * - * This function test if the transmitter fifo for the port - * described by 'port' is empty. If it is empty, this function - * should return TIOCSER_TEMT, otherwise return 0. - */ -static unsigned int mux_tx_empty(struct uart_port *port) -{ - return UART_GET_FIFO_CNT(port) ? 0 : TIOCSER_TEMT; -} - -/** - * mux_set_mctrl - Set the current state of the modem control inputs. - * @ports: Ptr to the uart_port. - * @mctrl: Modem control bits. - * - * The Serial MUX does not support CTS, DCD or DSR so this function - * is ignored. - */ -static void mux_set_mctrl(struct uart_port *port, unsigned int mctrl) -{ -} - -/** - * mux_get_mctrl - Returns the current state of modem control inputs. - * @port: Ptr to the uart_port. - * - * The Serial MUX does not support CTS, DCD or DSR so these lines are - * treated as permanently active. - */ -static unsigned int mux_get_mctrl(struct uart_port *port) -{ - return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; -} - -/** - * mux_stop_tx - Stop transmitting characters. - * @port: Ptr to the uart_port. - * - * The Serial MUX does not support this function. - */ -static void mux_stop_tx(struct uart_port *port) -{ -} - -/** - * mux_start_tx - Start transmitting characters. - * @port: Ptr to the uart_port. - * - * The Serial Mux does not support this function. - */ -static void mux_start_tx(struct uart_port *port) -{ -} - -/** - * mux_stop_rx - Stop receiving characters. - * @port: Ptr to the uart_port. - * - * The Serial Mux does not support this function. - */ -static void mux_stop_rx(struct uart_port *port) -{ -} - -/** - * mux_enable_ms - Enable modum status interrupts. - * @port: Ptr to the uart_port. - * - * The Serial Mux does not support this function. - */ -static void mux_enable_ms(struct uart_port *port) -{ -} - -/** - * mux_break_ctl - Control the transmitssion of a break signal. - * @port: Ptr to the uart_port. - * @break_state: Raise/Lower the break signal. - * - * The Serial Mux does not support this function. - */ -static void mux_break_ctl(struct uart_port *port, int break_state) -{ -} - -/** - * mux_write - Write chars to the mux fifo. - * @port: Ptr to the uart_port. - * - * This function writes all the data from the uart buffer to - * the mux fifo. - */ -static void mux_write(struct uart_port *port) -{ - int count; - struct circ_buf *xmit = &port->state->xmit; - - if(port->x_char) { - UART_PUT_CHAR(port, port->x_char); - port->icount.tx++; - port->x_char = 0; - return; - } - - if(uart_circ_empty(xmit) || uart_tx_stopped(port)) { - mux_stop_tx(port); - return; - } - - count = (port->fifosize) - UART_GET_FIFO_CNT(port); - do { - UART_PUT_CHAR(port, xmit->buf[xmit->tail]); - xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); - port->icount.tx++; - if(uart_circ_empty(xmit)) - break; - - } while(--count > 0); - - while(UART_GET_FIFO_CNT(port)) - udelay(1); - - if(uart_circ_chars_pending(xmit) < WAKEUP_CHARS) - uart_write_wakeup(port); - - if (uart_circ_empty(xmit)) - mux_stop_tx(port); -} - -/** - * mux_read - Read chars from the mux fifo. - * @port: Ptr to the uart_port. - * - * This reads all available data from the mux's fifo and pushes - * the data to the tty layer. - */ -static void mux_read(struct uart_port *port) -{ - int data; - struct tty_struct *tty = port->state->port.tty; - __u32 start_count = port->icount.rx; - - while(1) { - data = __raw_readl(port->membase + IO_DATA_REG_OFFSET); - - if (MUX_STATUS(data)) - continue; - - if (MUX_EOFIFO(data)) - break; - - port->icount.rx++; - - if (MUX_BREAK(data)) { - port->icount.brk++; - if(uart_handle_break(port)) - continue; - } - - if (uart_handle_sysrq_char(port, data & 0xffu)) - continue; - - tty_insert_flip_char(tty, data & 0xFF, TTY_NORMAL); - } - - if (start_count != port->icount.rx) { - tty_flip_buffer_push(tty); - } -} - -/** - * mux_startup - Initialize the port. - * @port: Ptr to the uart_port. - * - * Grab any resources needed for this port and start the - * mux timer. - */ -static int mux_startup(struct uart_port *port) -{ - mux_ports[port->line].enabled = 1; - return 0; -} - -/** - * mux_shutdown - Disable the port. - * @port: Ptr to the uart_port. - * - * Release any resources needed for the port. - */ -static void mux_shutdown(struct uart_port *port) -{ - mux_ports[port->line].enabled = 0; -} - -/** - * mux_set_termios - Chane port parameters. - * @port: Ptr to the uart_port. - * @termios: new termios settings. - * @old: old termios settings. - * - * The Serial Mux does not support this function. - */ -static void -mux_set_termios(struct uart_port *port, struct ktermios *termios, - struct ktermios *old) -{ -} - -/** - * mux_type - Describe the port. - * @port: Ptr to the uart_port. - * - * Return a pointer to a string constant describing the - * specified port. - */ -static const char *mux_type(struct uart_port *port) -{ - return "Mux"; -} - -/** - * mux_release_port - Release memory and IO regions. - * @port: Ptr to the uart_port. - * - * Release any memory and IO region resources currently in use by - * the port. - */ -static void mux_release_port(struct uart_port *port) -{ -} - -/** - * mux_request_port - Request memory and IO regions. - * @port: Ptr to the uart_port. - * - * Request any memory and IO region resources required by the port. - * If any fail, no resources should be registered when this function - * returns, and it should return -EBUSY on failure. - */ -static int mux_request_port(struct uart_port *port) -{ - return 0; -} - -/** - * mux_config_port - Perform port autoconfiguration. - * @port: Ptr to the uart_port. - * @type: Bitmask of required configurations. - * - * Perform any autoconfiguration steps for the port. This function is - * called if the UPF_BOOT_AUTOCONF flag is specified for the port. - * [Note: This is required for now because of a bug in the Serial core. - * rmk has already submitted a patch to linus, should be available for - * 2.5.47.] - */ -static void mux_config_port(struct uart_port *port, int type) -{ - port->type = PORT_MUX; -} - -/** - * mux_verify_port - Verify the port information. - * @port: Ptr to the uart_port. - * @ser: Ptr to the serial information. - * - * Verify the new serial port information contained within serinfo is - * suitable for this port type. - */ -static int mux_verify_port(struct uart_port *port, struct serial_struct *ser) -{ - if(port->membase == NULL) - return -EINVAL; - - return 0; -} - -/** - * mux_drv_poll - Mux poll function. - * @unused: Unused variable - * - * This function periodically polls the Serial MUX to check for new data. - */ -static void mux_poll(unsigned long unused) -{ - int i; - - for(i = 0; i < port_cnt; ++i) { - if(!mux_ports[i].enabled) - continue; - - mux_read(&mux_ports[i].port); - mux_write(&mux_ports[i].port); - } - - mod_timer(&mux_timer, jiffies + MUX_POLL_DELAY); -} - - -#ifdef CONFIG_SERIAL_MUX_CONSOLE -static void mux_console_write(struct console *co, const char *s, unsigned count) -{ - /* Wait until the FIFO drains. */ - while(UART_GET_FIFO_CNT(&mux_ports[0].port)) - udelay(1); - - while(count--) { - if(*s == '\n') { - UART_PUT_CHAR(&mux_ports[0].port, '\r'); - } - UART_PUT_CHAR(&mux_ports[0].port, *s++); - } - -} - -static int mux_console_setup(struct console *co, char *options) -{ - return 0; -} - -struct tty_driver *mux_console_device(struct console *co, int *index) -{ - *index = co->index; - return mux_driver.tty_driver; -} - -static struct console mux_console = { - .name = "ttyB", - .write = mux_console_write, - .device = mux_console_device, - .setup = mux_console_setup, - .flags = CON_ENABLED | CON_PRINTBUFFER, - .index = 0, -}; - -#define MUX_CONSOLE &mux_console -#else -#define MUX_CONSOLE NULL -#endif - -static struct uart_ops mux_pops = { - .tx_empty = mux_tx_empty, - .set_mctrl = mux_set_mctrl, - .get_mctrl = mux_get_mctrl, - .stop_tx = mux_stop_tx, - .start_tx = mux_start_tx, - .stop_rx = mux_stop_rx, - .enable_ms = mux_enable_ms, - .break_ctl = mux_break_ctl, - .startup = mux_startup, - .shutdown = mux_shutdown, - .set_termios = mux_set_termios, - .type = mux_type, - .release_port = mux_release_port, - .request_port = mux_request_port, - .config_port = mux_config_port, - .verify_port = mux_verify_port, -}; - -/** - * mux_probe - Determine if the Serial Mux should claim this device. - * @dev: The parisc device. - * - * Deterimine if the Serial Mux should claim this chip (return 0) - * or not (return 1). - */ -static int __init mux_probe(struct parisc_device *dev) -{ - int i, status; - - int port_count = get_mux_port_count(dev); - printk(KERN_INFO "Serial mux driver (%d ports) Revision: 0.6\n", port_count); - - dev_set_drvdata(&dev->dev, (void *)(long)port_count); - request_mem_region(dev->hpa.start + MUX_OFFSET, - port_count * MUX_LINE_OFFSET, "Mux"); - - if(!port_cnt) { - mux_driver.cons = MUX_CONSOLE; - - status = uart_register_driver(&mux_driver); - if(status) { - printk(KERN_ERR "Serial mux: Unable to register driver.\n"); - return 1; - } - } - - for(i = 0; i < port_count; ++i, ++port_cnt) { - struct uart_port *port = &mux_ports[port_cnt].port; - port->iobase = 0; - port->mapbase = dev->hpa.start + MUX_OFFSET + - (i * MUX_LINE_OFFSET); - port->membase = ioremap_nocache(port->mapbase, MUX_LINE_OFFSET); - port->iotype = UPIO_MEM; - port->type = PORT_MUX; - port->irq = NO_IRQ; - port->uartclk = 0; - port->fifosize = MUX_FIFO_SIZE; - port->ops = &mux_pops; - port->flags = UPF_BOOT_AUTOCONF; - port->line = port_cnt; - - /* The port->timeout needs to match what is present in - * uart_wait_until_sent in serial_core.c. Otherwise - * the time spent in msleep_interruptable will be very - * long, causing the appearance of a console hang. - */ - port->timeout = HZ / 50; - spin_lock_init(&port->lock); - - status = uart_add_one_port(&mux_driver, port); - BUG_ON(status); - } - - return 0; -} - -static int __devexit mux_remove(struct parisc_device *dev) -{ - int i, j; - int port_count = (long)dev_get_drvdata(&dev->dev); - - /* Find Port 0 for this card in the mux_ports list. */ - for(i = 0; i < port_cnt; ++i) { - if(mux_ports[i].port.mapbase == dev->hpa.start + MUX_OFFSET) - break; - } - BUG_ON(i + port_count > port_cnt); - - /* Release the resources associated with each port on the device. */ - for(j = 0; j < port_count; ++j, ++i) { - struct uart_port *port = &mux_ports[i].port; - - uart_remove_one_port(&mux_driver, port); - if(port->membase) - iounmap(port->membase); - } - - release_mem_region(dev->hpa.start + MUX_OFFSET, port_count * MUX_LINE_OFFSET); - return 0; -} - -/* Hack. This idea was taken from the 8250_gsc.c on how to properly order - * the serial port detection in the proper order. The idea is we always - * want the builtin mux to be detected before addin mux cards, so we - * specifically probe for the builtin mux cards first. - * - * This table only contains the parisc_device_id of known builtin mux - * devices. All other mux cards will be detected by the generic mux_tbl. - */ -static struct parisc_device_id builtin_mux_tbl[] = { - { HPHW_A_DIRECT, HVERSION_REV_ANY_ID, 0x15, 0x0000D }, /* All K-class */ - { HPHW_A_DIRECT, HVERSION_REV_ANY_ID, 0x44, 0x0000D }, /* E35, E45, and E55 */ - { 0, } -}; - -static struct parisc_device_id mux_tbl[] = { - { HPHW_A_DIRECT, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0000D }, - { 0, } -}; - -MODULE_DEVICE_TABLE(parisc, builtin_mux_tbl); -MODULE_DEVICE_TABLE(parisc, mux_tbl); - -static struct parisc_driver builtin_serial_mux_driver = { - .name = "builtin_serial_mux", - .id_table = builtin_mux_tbl, - .probe = mux_probe, - .remove = __devexit_p(mux_remove), -}; - -static struct parisc_driver serial_mux_driver = { - .name = "serial_mux", - .id_table = mux_tbl, - .probe = mux_probe, - .remove = __devexit_p(mux_remove), -}; - -/** - * mux_init - Serial MUX initialization procedure. - * - * Register the Serial MUX driver. - */ -static int __init mux_init(void) -{ - register_parisc_driver(&builtin_serial_mux_driver); - register_parisc_driver(&serial_mux_driver); - - if(port_cnt > 0) { - /* Start the Mux timer */ - init_timer(&mux_timer); - mux_timer.function = mux_poll; - mod_timer(&mux_timer, jiffies + MUX_POLL_DELAY); - -#ifdef CONFIG_SERIAL_MUX_CONSOLE - register_console(&mux_console); -#endif - } - - return 0; -} - -/** - * mux_exit - Serial MUX cleanup procedure. - * - * Unregister the Serial MUX driver from the tty layer. - */ -static void __exit mux_exit(void) -{ - /* Delete the Mux timer. */ - if(port_cnt > 0) { - del_timer(&mux_timer); -#ifdef CONFIG_SERIAL_MUX_CONSOLE - unregister_console(&mux_console); -#endif - } - - unregister_parisc_driver(&builtin_serial_mux_driver); - unregister_parisc_driver(&serial_mux_driver); - uart_unregister_driver(&mux_driver); -} - -module_init(mux_init); -module_exit(mux_exit); - -MODULE_AUTHOR("Ryan Bradetich"); -MODULE_DESCRIPTION("Serial MUX driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS_CHARDEV_MAJOR(MUX_MAJOR); |