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Date: Mon, 4 Mar 2013 20:54:16 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: linux-watchdog@...r.kernel.org
Cc: Wim Van Sebroeck <wim@...ana.be>, linux-kernel@...r.kernel.org,
Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH 5/8] watchdog: w83627hf: Auto-detect IO address and supported chips
Instead of requiring the user to provide an IO address per module
parameter, auto-detect it as well as supported chips.
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
drivers/watchdog/w83627hf_wdt.c | 121 ++++++++++++++++++++++++++++++++-------
1 file changed, 101 insertions(+), 20 deletions(-)
diff --git a/drivers/watchdog/w83627hf_wdt.c b/drivers/watchdog/w83627hf_wdt.c
index 8ae71fb..3a2ba30 100644
--- a/drivers/watchdog/w83627hf_wdt.c
+++ b/drivers/watchdog/w83627hf_wdt.c
@@ -44,10 +44,10 @@
#define WATCHDOG_NAME "w83627hf/thf/hg/dhg WDT"
#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
-/* You must set this - there is no sane way to probe for this board. */
-static int wdt_io = 0x2E;
-module_param(wdt_io, int, 0);
-MODULE_PARM_DESC(wdt_io, "w83627hf/thf WDT io port (default 0x2E)");
+static int wdt_io;
+
+enum chips { w83627hf, w83637hf, w83627thf, w83687thf, w83627ehf, w83627dhg,
+ w83627uhg };
/*
* Kernel methods.
@@ -60,6 +60,14 @@ MODULE_PARM_DESC(wdt_io, "w83627hf/thf WDT io port (default 0x2E)");
#define W83627HF_LD_WDT 0x08
+#define W83627HF_ID 0x52
+#define W83637HF_ID 0x70
+#define W83627THF_ID 0x82
+#define W83687THF_ID 0x85
+#define W83627EHF_ID 0x88
+#define W83627DHG_ID 0xa0
+#define W83627UHG_ID 0xa2
+
static void superio_outb(int reg, int val)
{
outb(reg, WDT_EFER);
@@ -88,29 +96,44 @@ static void superio_exit(void)
outb_p(0xAA, WDT_EFER); /* Leave extended function mode */
}
-/* tyan motherboards seem to set F5 to 0x4C ?
- * So explicitly init to appropriate value. */
-
-static void w83627hf_init(void)
+static void w83627hf_init(enum chips chip)
{
unsigned char t;
superio_enter();
superio_select(W83627HF_LD_WDT);
- t = superio_inb(0x20); /* check chip version */
- if (t == 0x82) { /* W83627THF */
- t = (superio_inb(0x2b) & 0xf7);
- superio_outb(0x2b, t | 0x04); /* set GPIO3 to WDT0 */
- } else if (t == 0x88 || t == 0xa0) { /* W83627EHF / W83627DHG */
- t = superio_inb(0x2d);
- superio_outb(0x2d, t & ~0x01); /* set GPIO5 to WDT0 */
- }
/* set CR30 bit 0 to activate GPIO2 */
t = superio_inb(0x30);
if (!(t & 0x01))
superio_outb(0x30, t | 0x01);
+ switch (chip) {
+ case w83627hf:
+ t = superio_inb(0x2B) & ~0x10;
+ superio_outb(0x2B, t); /* set GPIO24 to WDT0 */
+ break;
+ case w83627thf:
+ t = (superio_inb(0x2B) & ~0x08) | 0x04;
+ superio_outb(0x2B, t); /* set GPIO3 to WDT0 */
+ break;
+ case w83627ehf:
+ case w83627dhg:
+ case w83627uhg:
+ t = superio_inb(0x2D) & ~0x01; /* PIN77 -> WDT0# */
+ superio_outb(0x2D, t); /* set GPIO5 to WDT0 */
+ t = superio_inb(0xF5);
+ t |= 0x02; /* enable the WDTO# output low pulse
+ * to the KBRST# pin */
+ superio_outb(0xF5, t);
+ break;
+ case w83637hf:
+ case w83687thf:
+ break;
+ default:
+ break;
+ }
+
t = superio_inb(0xF6);
if (t != 0) {
pr_info("Watchdog already running. Resetting timeout to %d sec\n",
@@ -120,8 +143,6 @@ static void w83627hf_init(void)
/* set second mode & disable keyboard turning off watchdog */
t = superio_inb(0xF5) & ~0x0C;
- /* enable the WDTO# output low pulse to the KBRST# pin */
- t |= 0x02;
superio_outb(0xF5, t);
/* disable keyboard & mouse turning off watchdog */
@@ -217,19 +238,79 @@ static struct notifier_block wdt_notifier = {
.notifier_call = wdt_notify_sys,
};
+static int wdt_find(int addr)
+{
+ u8 val;
+ int ret = -ENODEV;
+
+ superio_enter();
+ superio_select(W83627HF_LD_WDT);
+ val = superio_inb(0x20);
+ switch (val) {
+ case W83627HF_ID:
+ ret = w83627hf;
+ break;
+ case W83637HF_ID:
+ ret = w83637hf;
+ break;
+ case W83627THF_ID:
+ ret = w83627thf;
+ break;
+ case W83687THF_ID:
+ ret = w83687thf;
+ break;
+ case W83627EHF_ID:
+ ret = w83627ehf;
+ break;
+ case W83627DHG_ID:
+ ret = w83627dhg;
+ break;
+ case W83627UHG_ID:
+ ret = w83627uhg;
+ break;
+ case 0xff:
+ break;
+ default:
+ pr_err("Unsupported chip ID: 0x%02x\n", val);
+ break;
+ }
+ superio_exit();
+ return ret;
+}
+
static int __init wdt_init(void)
{
int ret;
bool nowayout = WATCHDOG_NOWAYOUT;
+ int chip;
+ const char * const chip_name[] = {
+ "W83627HF",
+ "W83637HF",
+ "W83627THF",
+ "W83687THF",
+ "W83627EHF",
+ "W83627DHG",
+ "W83627UHG",
+ };
+
+ wdt_io = 0x2e;
+ chip = wdt_find(0x2e);
+ if (chip < 0) {
+ wdt_io = 0x4e;
+ chip = wdt_find(0x4e);
+ if (chip < 0)
+ return chip;
+ }
- pr_info("WDT driver for the Winbond(TM) W83627HF/THF/HG/DHG Super I/O chip initialising\n");
+ pr_info("WDT driver for %s Super I/O chip initialising, nowayout=%d\n",
+ chip_name[chip], nowayout);
if (!request_region(wdt_io, 1, WATCHDOG_NAME)) {
pr_err("I/O address 0x%04x already in use\n", wdt_io);
return -EIO;
}
- w83627hf_init();
+ w83627hf_init(chip);
ret = register_reboot_notifier(&wdt_notifier);
if (ret != 0) {
--
1.7.9.7
--
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