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>

1 files changed, 41 insertions, 4 deletions

diff --git a/drivers/watchdog/f71808e_wdt.c b/drivers/watchdog/f71808e_wdt.c
index 3c9142474d18..f573948998b0 100644
--- a/drivers/watchdog/f71808e_wdt.c
+++ b/drivers/watchdog/f71808e_wdt.c
@@ -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;