redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

watchdog: add f71862fg support 

Watchdog support for Fintek F71862fg Super-I/O added.
Two different hardware reset pins of the F71862fg chip can be configured 
by an additional module parameter.

Signed-off-by: Lutz Ballaschke <vegan.grindcore@googlemail.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
hifive-unleashed-5.1
Lutz Ballaschke 2010-09-26 16:25:35 +02:00 committed by Wim Van Sebroeck
parent f9a9f096d2
commit 7977ff6e3d
1 changed files with 41 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
drivers/watchdog/f71808e_wdt.c
View File

@ -42,6 +42,7 @@
#define SIO_REG_DEVID 0x20 /* Device ID (2 bytes) */
#define SIO_REG_DEVREV 0x22 /* Device revision */
#define SIO_REG_MANID 0x23 /* Fintek ID (2 bytes) */
#define SIO_REG_ROM_ADDR_SEL 0x27 /* ROM address select */
#define SIO_REG_MFUNCT1 0x29 /* Multi function select 1 */
#define SIO_REG_MFUNCT2 0x2a /* Multi function select 2 */
#define SIO_REG_MFUNCT3 0x2b /* Multi function select 3 */
@ -71,6 +72,8 @@
#define WATCHDOG_MAX_TIMEOUT (60 * 255)
#define WATCHDOG_PULSE_WIDTH 125 /* 125 ms, default pulse width for
watchdog signal */
#define WATCHDOG_F71862FG_PIN 63 /* default watchdog reset output
pin number 63 */
static unsigned short force_id;
module_param(force_id, ushort, 0);
@ -90,6 +93,12 @@ MODULE_PARM_DESC(pulse_width,
"Watchdog signal pulse width. 0(=level), 1 ms, 25 ms, 125 ms or 5000 ms"
" (default=" __MODULE_STRING(WATCHDOG_PULSE_WIDTH) ")");
static unsigned int f71862fg_pin = WATCHDOG_F71862FG_PIN;
module_param(f71862fg_pin, uint, 0);
MODULE_PARM_DESC(f71862fg_pin,
"Watchdog f71862fg reset output pin configuration. Choose pin 56 or 63"
" (default=" __MODULE_STRING(WATCHDOG_F71862FG_PIN)")");
static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0444);
MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
@ -283,6 +292,28 @@ exit_unlock:
return err;
}
static int f71862fg_pin_configure(unsigned short ioaddr)
{
/* When ioaddr is non-zero the calling function has to take care of
mutex handling and superio preparation! */
if (f71862fg_pin == 63) {
if (ioaddr) {
/* SPI must be disabled first to use this pin! */
superio_clear_bit(ioaddr, SIO_REG_ROM_ADDR_SEL, 6);
superio_set_bit(ioaddr, SIO_REG_MFUNCT3, 4);
}
} else if (f71862fg_pin == 56) {
if (ioaddr)
superio_set_bit(ioaddr, SIO_REG_MFUNCT1, 1);
} else {
printk(KERN_ERR DRVNAME ": Invalid argument f71862fg_pin=%d\n",
f71862fg_pin);
return -EINVAL;
}
return 0;
}
static int watchdog_start(void)
{
/* Make sure we don't die as soon as the watchdog is enabled below */
@ -304,6 +335,12 @@ static int watchdog_start(void)
superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT3, 3);
break;
case f71862fg:
err = f71862fg_pin_configure(watchdog.sioaddr);
if (err)
goto exit_superio;
break;
case f71882fg:
/* Set pin 56 to WDTRST# */
superio_set_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 1);
@ -712,16 +749,16 @@ static int __init f71808e_find(int sioaddr)
case SIO_F71808_ID:
watchdog.type = f71808fg;
break;
case SIO_F71862_ID:
watchdog.type = f71862fg;
err = f71862fg_pin_configure(0); /* validate module parameter */
break;
case SIO_F71882_ID:
watchdog.type = f71882fg;
break;
case SIO_F71889_ID:
watchdog.type = f71889fg;
break;
case SIO_F71862_ID:
/* These have a watchdog, though it isn't implemented (yet). */
err = -ENOSYS;
goto exit;
case SIO_F71858_ID:
/* Confirmed (by datasheet) not to have a watchdog. */
err = -ENODEV;