Commit 8a30e3c0 authored by Matthew Wilcox's avatar Matthew Wilcox Committed by James Simmons

[PATCH] Mux driver for PA-RISC

A driver for the Mux serial ports in some PA-RISC servers from Ryan Bradetich.
parent d9bfacba
...@@ -317,6 +317,44 @@ config SERIAL_SUNSU ...@@ -317,6 +317,44 @@ config SERIAL_SUNSU
mouse on (PCI) UltraSPARC systems. Say Y or M if you want to be able mouse on (PCI) UltraSPARC systems. Say Y or M if you want to be able
to these serial ports. to these serial ports.
config SERIAL_MUX
tristate "Serial MUX support"
depends on PARISC
default y
---help---
Saying Y here will enable the hardware MUX serial driver for
the Nova and K class systems. The hardware MUX is not 8250/16550
compatible therefore the /dev/ttyB0 device is shared between the
Serial MUX and the PDC software console. The following steps
need to be completed to use the Serial MUX:
1. create the device entry (mknod /dev/ttyB0 c 11 0)
2. Edit the /etc/inittab to start a getty listening on /dev/ttyB0
3. Add device ttyB0 to /etc/securetty (if you want to log on as
root on this console.)
4. Change the kernel command console parameter to: console=ttyB0
config SERIAL_MUX_CONSOLE
bool "Support for console on serial MUX"
depends on SERIAL_MUX
default y
config PDC_CONSOLE
bool "PDC software console support"
depends on PARISC && !SERIAL_MUX
default n
help
Saying Y here will enable the software based PDC console to be
used as the system console. This is useful for machines in
which the hardware based console has not been written yet. The
following steps must be competed to use the PDC console:
1. create the device entry (mknod /dev/ttyB0 c 11 0)
2. Edit the /etc/inittab to start a getty listening on /dev/ttyB0
3. Add device ttyB0 to /etc/securetty (if you want to log on as
root on this console.)
4. Change the kernel command console parameter to: console=ttyB0
config SERIAL_SUNSAB config SERIAL_SUNSAB
tristate "Sun Siemens SAB82532 serial support" tristate "Sun Siemens SAB82532 serial support"
depends on (SPARC32 || SPARC64) && PCI depends on (SPARC32 || SPARC64) && PCI
...@@ -336,12 +374,12 @@ config V850E_NB85E_UART_CONSOLE ...@@ -336,12 +374,12 @@ config V850E_NB85E_UART_CONSOLE
config SERIAL_CORE config SERIAL_CORE
tristate tristate
default m if SERIAL_AMBA!=y && SERIAL_CLPS711X!=y && SERIAL_21285!=y && !SERIAL_SA1100 && !SERIAL_ANAKIN && !SERIAL_UART00 && SERIAL_8250!=y && !SERIAL_ROCKETPORT && !SERIAL_SUNCORE && !V850E_NB85E_UART && (SERIAL_AMBA=m || SERIAL_CLPS711X=m || SERIAL_21285=m || SERIAL_8250=m) default m if SERIAL_AMBA!=y && SERIAL_CLPS711X!=y && SERIAL_21285!=y && !SERIAL_SA1100 && !SERIAL_ANAKIN && !SERIAL_UART00 && SERIAL_8250!=y && SERIAL_MUX!=y && !SERIAL_ROCKETPORT && !SERIAL_SUNCORE && !V850E_NB85E_UART && (SERIAL_AMBA=m || SERIAL_CLPS711X=m || SERIAL_21285=m || SERIAL_8250=m || SERIAL_MUX=m)
default y if SERIAL_AMBA=y || SERIAL_CLPS711X=y || SERIAL_21285=y || SERIAL_SA1100 || SERIAL_ANAKIN || SERIAL_UART00 || SERIAL_8250=y || SERIAL_ROCKETPORT || SERIAL_SUNCORE || V850E_NB85E_UART default y if SERIAL_AMBA=y || SERIAL_CLPS711X=y || SERIAL_21285=y || SERIAL_SA1100 || SERIAL_ANAKIN || SERIAL_UART00 || SERIAL_8250=y || SERIAL_MUX=y || SERIAL_ROCKETPORT || SERIAL_SUNCORE || V850E_NB85E_UART
config SERIAL_CORE_CONSOLE config SERIAL_CORE_CONSOLE
bool bool
depends on SERIAL_AMBA_CONSOLE || SERIAL_CLPS711X_CONSOLE || SERIAL_21285_CONSOLE || SERIAL_SA1100_CONSOLE || SERIAL_ANAKIN_CONSOLE || SERIAL_UART00_CONSOLE || SERIAL_8250_CONSOLE || SERIAL_SUNCORE || V850E_NB85E_UART_CONSOLE depends on SERIAL_AMBA_CONSOLE || SERIAL_CLPS711X_CONSOLE || SERIAL_21285_CONSOLE || SERIAL_SA1100_CONSOLE || SERIAL_ANAKIN_CONSOLE || SERIAL_UART00_CONSOLE || SERIAL_8250_CONSOLE || SERIAL_MUX_CONSOLE || SERIAL_SUNCORE || V850E_NB85E_UART_CONSOLE
default y default y
config SERIAL_68328 config SERIAL_68328
......
...@@ -24,6 +24,7 @@ obj-$(CONFIG_SERIAL_SUNCORE) += suncore.o ...@@ -24,6 +24,7 @@ obj-$(CONFIG_SERIAL_SUNCORE) += suncore.o
obj-$(CONFIG_SERIAL_SUNZILOG) += sunzilog.o obj-$(CONFIG_SERIAL_SUNZILOG) += sunzilog.o
obj-$(CONFIG_SERIAL_SUNSU) += sunsu.o obj-$(CONFIG_SERIAL_SUNSU) += sunsu.o
obj-$(CONFIG_SERIAL_SUNSAB) += sunsab.o obj-$(CONFIG_SERIAL_SUNSAB) += sunsab.o
obj-$(CONFIG_SERIAL_MUX) += mux.o
obj-$(CONFIG_SERIAL_68328) += 68328serial.o obj-$(CONFIG_SERIAL_68328) += 68328serial.o
obj-$(CONFIG_SERIAL_68360) += 68360serial.o obj-$(CONFIG_SERIAL_68360) += 68360serial.o
obj-$(CONFIG_SERIAL_COLDFIRE) += mcfserial.o obj-$(CONFIG_SERIAL_COLDFIRE) += mcfserial.o
......
/*
** 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/config.h>
#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 <asm/io.h>
#ifdef CONFIG_MAGIC_SYSRQ
#include <linux/sysrq.h>
#define SUPPORT_SYSRQ
#endif
#include <linux/serial_core.h>
#define MUX_NR 1
#define MUX_OFFSET 0x800
#define MUX_LINE_OFFSET 0x80
#define MUX_FIFO_SIZE 255
#define MUX_MIN_FREE_SIZE 32
#define MUX_FIFO_DRAIN_DELAY 1
#define MUX_POLL_DELAY (30 * HZ / 1000)
#define IO_COMMAND_REG_OFFSET 0x30
#define IO_STATUS_REG_OFFSET 0x34
#define IO_DATA_REG_OFFSET 0x3c
#define IO_DCOUNT_REG_OFFSET 0x40
#define IO_UCOUNT_REG_OFFSET 0x44
#define IO_FIFOS_REG_OFFSET 0x48
#define MUX_EOFIFO(status) ((status & 0xF000) == 0xF000)
#define MUX_STATUS(status) ((status & 0xF000) == 0x8000)
#define MUX_BREAK(status) ((status & 0xF000) == 0x2000)
static struct uart_port mux_ports[MUX_NR];
static struct timer_list mux_timer;
#define UART_PUT_CHAR(p, c) __raw_writel((c), (unsigned long)(p)->membase + IO_DATA_REG_OFFSET)
#define UART_GET_FIFO_CNT(p) __raw_readl((unsigned long)(p)->membase + IO_DCOUNT_REG_OFFSET)
/**
* 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)
{
unsigned int cnt = __raw_readl((unsigned long)port->membase
+ IO_DCOUNT_REG_OFFSET);
return cnt ? 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.
* @tty_stop: tty layer issue this command?
*
* The Serial MUX does not support this function.
*/
static void mux_stop_tx(struct uart_port *port, unsigned int tty_stop)
{
}
/**
* mux_start_tx - Start transmitting characters.
* @port: Ptr to the uart_port.
* @tty_start: tty layer issue this command?
*
* The Serial Mux does not support this function.
*/
static void mux_start_tx(struct uart_port *port, unsigned int tty_start)
{
}
/**
* 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->info->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, 0);
return;
}
count = (port->fifosize >> 1) - 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);
if(uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
if (uart_circ_empty(xmit))
mux_stop_tx(port, 0);
}
/**
* 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;
__u32 start_count = port->icount.rx;
struct tty_struct *tty = port->info->tty;
while(1) {
data = __raw_readl((unsigned long)port->membase
+ IO_DATA_REG_OFFSET);
if (MUX_STATUS(data))
continue;
if (MUX_EOFIFO(data))
break;
if (tty->flip.count >= TTY_FLIPBUF_SIZE)
continue;
*tty->flip.char_buf_ptr = data & 0xffu;
*tty->flip.flag_buf_ptr = TTY_NORMAL;
port->icount.rx++;
if (MUX_BREAK(data)) {
port->icount.brk++;
if(uart_handle_break(port))
continue;
}
if (uart_handle_sysrq_char(port, data & 0xffu, NULL))
continue;
tty->flip.flag_buf_ptr++;
tty->flip.char_buf_ptr++;
tty->flip.count++;
}
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)
{
mod_timer(&mux_timer, jiffies + MUX_POLL_DELAY);
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_change_speed - Chane port parameters.
* @port: Ptr to the uart_port.
* @cflag: character flags.
* @iflag: interrupt flags.
* @quot:
*
* The Serial Mux does not support this function.
*/
static void
mux_change_speed(struct uart_port *port, unsigned int cflag,
unsigned int iflag, unsigned int quot)
{
}
/**
* 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";
}
/**
* 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 functino 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)
{
struct uart_port *port = &mux_ports[0];
mux_read(port);
mux_write(port);
mod_timer(&mux_timer, jiffies + MUX_POLL_DELAY);
}
#ifdef CONFIG_SERIAL_MUX_CONSOLE
static struct console mux_console = {
.name = "ttyB",
.flags = 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,
.change_speed = mux_change_speed,
.type = mux_type,
.release_port = mux_release_port,
.request_port = mux_request_port,
.config_port = mux_config_port,
.verify_port = mux_verify_port,
};
static struct uart_driver mux_reg = {
.owner = THIS_MODULE,
.driver_name = "ttyB",
#ifdef CONFIG_DEVFS_FS
.dev_name = "ttyB%d",
#else
.dev_name = "ttyB%d",
#endif
.major = MUX_MAJOR,
.minor = 0,
.nr = MUX_NR,
.cons = MUX_CONSOLE,
};
/**
* 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, ret;
struct uart_port *port = &mux_ports[0];
init_timer(&mux_timer);
mux_timer.function = mux_poll;
printk(KERN_INFO "Serial mux driver Revision: 0.1\n");
ret = uart_register_driver(&mux_reg);
if (ret)
return ret;
for (i = 0; i < MUX_NR; i++) {
port = &mux_ports[i];
port->iobase = 0;
port->mapbase = dev->hpa + MUX_OFFSET + (i * MUX_LINE_OFFSET);
port->membase = ioremap(port->mapbase, MUX_LINE_OFFSET);
port->iotype = SERIAL_IO_MEM;
port->type = PORT_MUX;
port->irq = SERIAL_IRQ_NONE;
port->uartclk = 0;
port->fifosize = MUX_FIFO_SIZE;
port->ops = &mux_pops;
port->flags = UPF_BOOT_AUTOCONF;
port->line = 0;
uart_add_one_port(&mux_reg, port);
}
return 0;
}
static struct parisc_device_id mux_tbl[] = {
{ HPHW_A_DIRECT, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0000D },
{ 0, }
};
MODULE_DEVICE_TABLE(parisc, mux_tbl);
static struct parisc_driver mux_driver = {
.name = "Serial MUX driver",
.id_table = mux_tbl,
.probe = mux_probe,
};
/**
* mux_init - Serial MUX initalization procedure.
*
* Register the Serial MUX driver.
*/
static int __init mux_init(void)
{
return register_parisc_driver(&mux_driver);
}
/**
* mux_exit - Serial MUX cleanup procedure.
*
* Unregister the Serial MUX driver from the tty layer.
*/
static void __exit mux_exit(void)
{
int i;
for (i = 0; i < MUX_NR; i++) {
uart_remove_one_port(&mux_reg, &mux_ports[i]);
}
uart_unregister_driver(&mux_reg);
}
module_init(mux_init);
module_exit(mux_exit);
MODULE_AUTHOR("Ryan Bradetich");
MODULE_DESCRIPTION("Serial MUX driver");
MODULE_LICENSE("GPL");
...@@ -33,6 +33,7 @@ ...@@ -33,6 +33,7 @@
#define MD_MAJOR 9 #define MD_MAJOR 9
#define MISC_MAJOR 10 #define MISC_MAJOR 10
#define SCSI_CDROM_MAJOR 11 #define SCSI_CDROM_MAJOR 11
#define MUX_MAJOR 11 /* PA-RISC only */
#define QIC02_TAPE_MAJOR 12 #define QIC02_TAPE_MAJOR 12
#define XT_DISK_MAJOR 13 #define XT_DISK_MAJOR 13
#define SOUND_MAJOR 14 #define SOUND_MAJOR 14
......
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