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watchdog: iTCO: Add support for Cannon Lake PCH iTCO 

In Intel Cannon Lake PCH the NO_REBOOT bit was moved from the private
register space to be part of the TCO1_CNT register. For this reason
introduce another version (6) that uses this register to set and clear
NO_REBOOT bit.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Mika Westerberg 2019-08-31 17:24:01 +03:00 committed by Wolfram Sang
parent 51d138292e
commit da23b6faa8
1 changed files with 24 additions and 2 deletions
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26
drivers/watchdog/iTCO_wdt.c
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@ -48,6 +48,7 @@
/* Includes */
#include <linux/acpi.h> /* For ACPI support */
#include <linux/bits.h> /* For BIT() */
#include <linux/module.h> /* For module specific items */
#include <linux/moduleparam.h> /* For new moduleparam's */
#include <linux/types.h> /* For standard types (like size_t) */
@ -215,6 +216,23 @@ static int update_no_reboot_bit_mem(void *priv, bool set)
return 0;
}
static int update_no_reboot_bit_cnt(void *priv, bool set)
{
struct iTCO_wdt_private *p = priv;
u16 val, newval;
val = inw(TCO1_CNT(p));
if (set)
val |= BIT(0);
else
val &= ~BIT(0);
outw(val, TCO1_CNT(p));
newval = inw(TCO1_CNT(p));
/* make sure the update is successful */
return val != newval ? -EIO : 0;
}
static void iTCO_wdt_no_reboot_bit_setup(struct iTCO_wdt_private *p,
struct itco_wdt_platform_data *pdata)
{
@ -224,7 +242,9 @@ static void iTCO_wdt_no_reboot_bit_setup(struct iTCO_wdt_private *p,
return;
}
if (p->iTCO_version >= 2)
if (p->iTCO_version >= 6)
p->update_no_reboot_bit = update_no_reboot_bit_cnt;
else if (p->iTCO_version >= 2)
p->update_no_reboot_bit = update_no_reboot_bit_mem;
else if (p->iTCO_version == 1)
p->update_no_reboot_bit = update_no_reboot_bit_pci;
@ -452,7 +472,8 @@ static int iTCO_wdt_probe(struct platform_device *pdev)
* Get the Memory-Mapped GCS or PMC register, we need it for the
* NO_REBOOT flag (TCO v2 and v3).
*/
if (p->iTCO_version >= 2 && !pdata->update_no_reboot_bit) {
if (p->iTCO_version >= 2 && p->iTCO_version < 6 &&
!pdata->update_no_reboot_bit) {
p->gcs_pmc_res = platform_get_resource(pdev,
IORESOURCE_MEM,
ICH_RES_MEM_GCS_PMC);
@ -502,6 +523,7 @@ static int iTCO_wdt_probe(struct platform_device *pdev)
/* Clear out the (probably old) status */
switch (p->iTCO_version) {
case 6:
case 5:
case 4:
outw(0x0008, TCO1_STS(p)); /* Clear the Time Out Status bit */