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watchdog: iTCO_wdt: Make ICH_RES_IO_SMI optional 

The iTCO_wdt driver only needs ICH_RES_IO_SMI I/O resource when either
turn_SMI_watchdog_clear_off module parameter is set to match ->iTCO_version
(or higher), and when legacy iTCO_vendorsupport is set. Modify the driver
so that ICH_RES_IO_SMI is optional if the two conditions are not met.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Mika Westerberg 2020-02-26 16:21:21 +03:00 committed by Wolfram Sang
parent 7ca6ee3890
commit e42b0c2438
1 changed files with 16 additions and 12 deletions
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28
drivers/watchdog/iTCO_wdt.c
View File

@ -459,13 +459,25 @@ static int iTCO_wdt_probe(struct platform_device *pdev)
if (!p->tco_res)
return -ENODEV;
p->smi_res = platform_get_resource(pdev, IORESOURCE_IO, ICH_RES_IO_SMI);
if (!p->smi_res)
return -ENODEV;
p->iTCO_version = pdata->version;
p->pci_dev = to_pci_dev(dev->parent);
p->smi_res = platform_get_resource(pdev, IORESOURCE_IO, ICH_RES_IO_SMI);
if (p->smi_res) {
/* The TCO logic uses the TCO_EN bit in the SMI_EN register */
if (!devm_request_region(dev, p->smi_res->start,
resource_size(p->smi_res),
pdev->name)) {
pr_err("I/O address 0x%04llx already in use, device disabled\n",
(u64)SMI_EN(p));
return -EBUSY;
}
} else if (iTCO_vendorsupport ||
turn_SMI_watchdog_clear_off >= p->iTCO_version) {
pr_err("SMI I/O resource is missing\n");
return -ENODEV;
}
iTCO_wdt_no_reboot_bit_setup(p, pdata);
/*
@ -492,14 +504,6 @@ static int iTCO_wdt_probe(struct platform_device *pdev)
/* Set the NO_REBOOT bit to prevent later reboots, just for sure */
p->update_no_reboot_bit(p->no_reboot_priv, true);
/* The TCO logic uses the TCO_EN bit in the SMI_EN register */
if (!devm_request_region(dev, p->smi_res->start,
resource_size(p->smi_res),
pdev->name)) {
pr_err("I/O address 0x%04llx already in use, device disabled\n",
(u64)SMI_EN(p));
return -EBUSY;
}
if (turn_SMI_watchdog_clear_off >= p->iTCO_version) {
/*
* Bit 13: TCO_EN -> 0