[PATCH 5/8] watchdog: iTCO_wdt: Add support for v3 silicon
From: Peter Tyser
Date: Mon Mar 10 2014 - 17:36:14 EST
Some new Atom's, eg Avoton and Bay Trail, have slightly different iTCO
functionality:
- The watchdog timer ticks at 1 second instead of .6 seconds
- Some 8 and 16-bit registers were combined into 32-bit registers
- Some registers were removed (DAT_IN, DAT_OUT, MESSAGE)
- The BOOT_STS field in TCO_STS was removed
- The NO_REBOOT bit is in the PMC area instead of GCS
Update the driver to support the above changes and bump the version to
1.11.
Signed-off-by: Peter Tyser <ptyser@xxxxxxxxxxx>
Tested-by: Rajat Jain <rajatjain@xxxxxxxxxxx>
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Cc: James Ralston <james.d.ralston@xxxxxxxxx>
Cc: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx>
Cc: Lee Jones <lee.jones@xxxxxxxxxx>
Cc: Wim Van Sebroeck <wim@xxxxxxxxx>
Cc: linux-watchdog@xxxxxxxxxxxxxxx
---
drivers/watchdog/iTCO_wdt.c | 137 ++++++++++++++++++++++++++-----------------
1 files changed, 82 insertions(+), 55 deletions(-)
diff --git a/drivers/watchdog/iTCO_wdt.c b/drivers/watchdog/iTCO_wdt.c
index 04f8af6..6d5928f 100644
--- a/drivers/watchdog/iTCO_wdt.c
+++ b/drivers/watchdog/iTCO_wdt.c
@@ -48,7 +48,7 @@
/* Module and version information */
#define DRV_NAME "iTCO_wdt"
-#define DRV_VERSION "1.10"
+#define DRV_VERSION "1.11"
/* Includes */
#include <linux/module.h> /* For module specific items */
@@ -92,9 +92,12 @@ static struct { /* this is private data for the iTCO_wdt device */
unsigned int iTCO_version;
struct resource *tco_res;
struct resource *smi_res;
- struct resource *gcs_res;
- /* NO_REBOOT flag is Memory-Mapped GCS register bit 5 (TCO version 2)*/
- unsigned long __iomem *gcs;
+ /*
+ * NO_REBOOT flag is Memory-Mapped GCS register bit 5 (TCO version 2),
+ * or memory-mapped PMC register bit 4 (TCO version 3).
+ */
+ struct resource *gcs_pmc_res;
+ unsigned long __iomem *gcs_pmc;
/* the lock for io operations */
spinlock_t io_lock;
struct platform_device *dev;
@@ -125,11 +128,19 @@ MODULE_PARM_DESC(turn_SMI_watchdog_clear_off,
* Some TCO specific functions
*/
-static inline unsigned int seconds_to_ticks(int seconds)
+/*
+ * The iTCO v1 and v2's internal timer is stored as ticks which decrement
+ * every 0.6 seconds. v3's internal timer is stored as seconds (some
+ * datasheets incorrectly state 0.6 seconds).
+ */
+static inline unsigned int seconds_to_ticks(int secs)
{
- /* the internal timer is stored as ticks which decrement
- * every 0.6 seconds */
- return (seconds * 10) / 6;
+ return iTCO_wdt_private.iTCO_version == 3 ? secs : (secs * 10) / 6;
+}
+
+static inline unsigned int ticks_to_seconds(int ticks)
+{
+ return iTCO_wdt_private.iTCO_version == 3 ? ticks : (ticks * 6) / 10;
}
static void iTCO_wdt_set_NO_REBOOT_bit(void)
@@ -137,10 +148,14 @@ static void iTCO_wdt_set_NO_REBOOT_bit(void)
u32 val32;
/* Set the NO_REBOOT bit: this disables reboots */
- if (iTCO_wdt_private.iTCO_version == 2) {
- val32 = readl(iTCO_wdt_private.gcs);
+ if (iTCO_wdt_private.iTCO_version == 3) {
+ val32 = readl(iTCO_wdt_private.gcs_pmc);
+ val32 |= 0x00000010;
+ writel(val32, iTCO_wdt_private.gcs_pmc);
+ } else if (iTCO_wdt_private.iTCO_version == 2) {
+ val32 = readl(iTCO_wdt_private.gcs_pmc);
val32 |= 0x00000020;
- writel(val32, iTCO_wdt_private.gcs);
+ writel(val32, iTCO_wdt_private.gcs_pmc);
} else if (iTCO_wdt_private.iTCO_version == 1) {
pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
val32 |= 0x00000002;
@@ -154,12 +169,20 @@ static int iTCO_wdt_unset_NO_REBOOT_bit(void)
u32 val32;
/* Unset the NO_REBOOT bit: this enables reboots */
- if (iTCO_wdt_private.iTCO_version == 2) {
- val32 = readl(iTCO_wdt_private.gcs);
+ if (iTCO_wdt_private.iTCO_version == 3) {
+ val32 = readl(iTCO_wdt_private.gcs_pmc);
+ val32 &= 0xffffffef;
+ writel(val32, iTCO_wdt_private.gcs_pmc);
+
+ val32 = readl(iTCO_wdt_private.gcs_pmc);
+ if (val32 & 0x00000010)
+ ret = -EIO;
+ } else if (iTCO_wdt_private.iTCO_version == 2) {
+ val32 = readl(iTCO_wdt_private.gcs_pmc);
val32 &= 0xffffffdf;
- writel(val32, iTCO_wdt_private.gcs);
+ writel(val32, iTCO_wdt_private.gcs_pmc);
- val32 = readl(iTCO_wdt_private.gcs);
+ val32 = readl(iTCO_wdt_private.gcs_pmc);
if (val32 & 0x00000020)
ret = -EIO;
} else if (iTCO_wdt_private.iTCO_version == 1) {
@@ -192,7 +215,7 @@ static int iTCO_wdt_start(struct watchdog_device *wd_dev)
/* Force the timer to its reload value by writing to the TCO_RLD
register */
- if (iTCO_wdt_private.iTCO_version == 2)
+ if (iTCO_wdt_private.iTCO_version >= 2)
outw(0x01, TCO_RLD);
else if (iTCO_wdt_private.iTCO_version == 1)
outb(0x01, TCO_RLD);
@@ -240,9 +263,9 @@ static int iTCO_wdt_ping(struct watchdog_device *wd_dev)
iTCO_vendor_pre_keepalive(iTCO_wdt_private.smi_res, wd_dev->timeout);
/* Reload the timer by writing to the TCO Timer Counter register */
- if (iTCO_wdt_private.iTCO_version == 2)
+ if (iTCO_wdt_private.iTCO_version >= 2) {
outw(0x01, TCO_RLD);
- else if (iTCO_wdt_private.iTCO_version == 1) {
+ } else if (iTCO_wdt_private.iTCO_version == 1) {
/* Reset the timeout status bit so that the timer
* needs to count down twice again before rebooting */
outw(0x0008, TCO1_STS); /* write 1 to clear bit */
@@ -270,14 +293,14 @@ static int iTCO_wdt_set_timeout(struct watchdog_device *wd_dev, unsigned int t)
/* "Values of 0h-3h are ignored and should not be attempted" */
if (tmrval < 0x04)
return -EINVAL;
- if (((iTCO_wdt_private.iTCO_version == 2) && (tmrval > 0x3ff)) ||
+ if (((iTCO_wdt_private.iTCO_version >= 2) && (tmrval > 0x3ff)) ||
((iTCO_wdt_private.iTCO_version == 1) && (tmrval > 0x03f)))
return -EINVAL;
iTCO_vendor_pre_set_heartbeat(tmrval);
/* Write new heartbeat to watchdog */
- if (iTCO_wdt_private.iTCO_version == 2) {
+ if (iTCO_wdt_private.iTCO_version >= 2) {
spin_lock(&iTCO_wdt_private.io_lock);
val16 = inw(TCOv2_TMR);
val16 &= 0xfc00;
@@ -312,13 +335,13 @@ static unsigned int iTCO_wdt_get_timeleft(struct watchdog_device *wd_dev)
unsigned int time_left = 0;
/* read the TCO Timer */
- if (iTCO_wdt_private.iTCO_version == 2) {
+ if (iTCO_wdt_private.iTCO_version >= 2) {
spin_lock(&iTCO_wdt_private.io_lock);
val16 = inw(TCO_RLD);
val16 &= 0x3ff;
spin_unlock(&iTCO_wdt_private.io_lock);
- time_left = (val16 * 6) / 10;
+ time_left = ticks_to_seconds(val16);
} else if (iTCO_wdt_private.iTCO_version == 1) {
spin_lock(&iTCO_wdt_private.io_lock);
val8 = inb(TCO_RLD);
@@ -327,7 +350,7 @@ static unsigned int iTCO_wdt_get_timeleft(struct watchdog_device *wd_dev)
val8 += (inb(TCOv1_TMR) & 0x3f);
spin_unlock(&iTCO_wdt_private.io_lock);
- time_left = (val8 * 6) / 10;
+ time_left = ticks_to_seconds(val8);
}
return time_left;
}
@@ -376,16 +399,16 @@ static void iTCO_wdt_cleanup(void)
resource_size(iTCO_wdt_private.tco_res));
release_region(iTCO_wdt_private.smi_res->start,
resource_size(iTCO_wdt_private.smi_res));
- if (iTCO_wdt_private.iTCO_version == 2) {
- iounmap(iTCO_wdt_private.gcs);
- release_mem_region(iTCO_wdt_private.gcs_res->start,
- resource_size(iTCO_wdt_private.gcs_res));
+ if (iTCO_wdt_private.iTCO_version >= 2) {
+ iounmap(iTCO_wdt_private.gcs_pmc);
+ release_mem_region(iTCO_wdt_private.gcs_pmc_res->start,
+ resource_size(iTCO_wdt_private.gcs_pmc_res));
}
iTCO_wdt_private.tco_res = NULL;
iTCO_wdt_private.smi_res = NULL;
- iTCO_wdt_private.gcs_res = NULL;
- iTCO_wdt_private.gcs = NULL;
+ iTCO_wdt_private.gcs_pmc_res = NULL;
+ iTCO_wdt_private.gcs_pmc = NULL;
}
static int iTCO_wdt_probe(struct platform_device *dev)
@@ -414,27 +437,27 @@ static int iTCO_wdt_probe(struct platform_device *dev)
iTCO_wdt_private.pdev = to_pci_dev(dev->dev.parent);
/*
- * Get the Memory-Mapped GCS register, we need it for the
- * NO_REBOOT flag (TCO v2).
+ * Get the Memory-Mapped GCS or PMC register, we need it for the
+ * NO_REBOOT flag (TCO v2 and v3).
*/
- if (iTCO_wdt_private.iTCO_version == 2) {
- iTCO_wdt_private.gcs_res = platform_get_resource(dev,
+ if (iTCO_wdt_private.iTCO_version >= 2) {
+ iTCO_wdt_private.gcs_pmc_res = platform_get_resource(dev,
IORESOURCE_MEM,
- ICH_RES_MEM_GCS);
+ ICH_RES_MEM_GCS_PMC);
- if (!iTCO_wdt_private.gcs_res)
+ if (!iTCO_wdt_private.gcs_pmc_res)
goto out;
- if (!request_mem_region(iTCO_wdt_private.gcs_res->start,
- resource_size(iTCO_wdt_private.gcs_res), dev->name)) {
+ if (!request_mem_region(iTCO_wdt_private.gcs_pmc_res->start,
+ resource_size(iTCO_wdt_private.gcs_pmc_res), dev->name)) {
ret = -EBUSY;
goto out;
}
- iTCO_wdt_private.gcs = ioremap(iTCO_wdt_private.gcs_res->start,
- resource_size(iTCO_wdt_private.gcs_res));
- if (!iTCO_wdt_private.gcs) {
+ iTCO_wdt_private.gcs_pmc = ioremap(iTCO_wdt_private.gcs_pmc_res->start,
+ resource_size(iTCO_wdt_private.gcs_pmc_res));
+ if (!iTCO_wdt_private.gcs_pmc) {
ret = -EIO;
- goto unreg_gcs;
+ goto unreg_gcs_pmc;
}
}
@@ -442,7 +465,7 @@ static int iTCO_wdt_probe(struct platform_device *dev)
if (iTCO_wdt_unset_NO_REBOOT_bit() && iTCO_vendor_check_noreboot_on()) {
pr_info("unable to reset NO_REBOOT flag, device disabled by hardware/BIOS\n");
ret = -ENODEV; /* Cannot reset NO_REBOOT bit */
- goto unmap_gcs;
+ goto unmap_gcs_pmc;
}
/* Set the NO_REBOOT bit to prevent later reboots, just for sure */
@@ -454,7 +477,7 @@ static int iTCO_wdt_probe(struct platform_device *dev)
pr_err("I/O address 0x%04llx already in use, device disabled\n",
(u64)SMI_EN);
ret = -EBUSY;
- goto unmap_gcs;
+ goto unmap_gcs_pmc;
}
if (turn_SMI_watchdog_clear_off >= iTCO_wdt_private.iTCO_version) {
/*
@@ -478,9 +501,13 @@ static int iTCO_wdt_probe(struct platform_device *dev)
ich_info->name, ich_info->iTCO_version, (u64)TCOBASE);
/* Clear out the (probably old) status */
- outw(0x0008, TCO1_STS); /* Clear the Time Out Status bit */
- outw(0x0002, TCO2_STS); /* Clear SECOND_TO_STS bit */
- outw(0x0004, TCO2_STS); /* Clear BOOT_STS bit */
+ if (iTCO_wdt_private.iTCO_version == 3) {
+ outl(0x20008, TCO1_STS);
+ } else {
+ outw(0x0008, TCO1_STS); /* Clear the Time Out Status bit */
+ outw(0x0002, TCO2_STS); /* Clear SECOND_TO_STS bit */
+ outw(0x0004, TCO2_STS); /* Clear BOOT_STS bit */
+ }
iTCO_wdt_watchdog_dev.bootstatus = 0;
iTCO_wdt_watchdog_dev.timeout = WATCHDOG_TIMEOUT;
@@ -515,18 +542,18 @@ unreg_tco:
unreg_smi:
release_region(iTCO_wdt_private.smi_res->start,
resource_size(iTCO_wdt_private.smi_res));
-unmap_gcs:
- if (iTCO_wdt_private.iTCO_version == 2)
- iounmap(iTCO_wdt_private.gcs);
-unreg_gcs:
- if (iTCO_wdt_private.iTCO_version == 2)
- release_mem_region(iTCO_wdt_private.gcs_res->start,
- resource_size(iTCO_wdt_private.gcs_res));
+unmap_gcs_pmc:
+ if (iTCO_wdt_private.iTCO_version >= 2)
+ iounmap(iTCO_wdt_private.gcs_pmc);
+unreg_gcs_pmc:
+ if (iTCO_wdt_private.iTCO_version >= 2)
+ release_mem_region(iTCO_wdt_private.gcs_pmc_res->start,
+ resource_size(iTCO_wdt_private.gcs_pmc_res));
out:
iTCO_wdt_private.tco_res = NULL;
iTCO_wdt_private.smi_res = NULL;
- iTCO_wdt_private.gcs_res = NULL;
- iTCO_wdt_private.gcs = NULL;
+ iTCO_wdt_private.gcs_pmc_res = NULL;
+ iTCO_wdt_private.gcs_pmc = NULL;
return ret;
}
--
1.7.7.GIT
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