From 140c91b26ebc48d80c6ac3ef06953b17d7fb3785 Mon Sep 17 00:00:00 2001 From: Kuppuswamy Sathyanarayanan Date: Sun, 9 Apr 2017 15:00:19 -0700 Subject: [PATCH] watchdog: iTCO_wdt: Add PMC specific noreboot update api In some SoCs, setting noreboot bit needs modification to PMC GC registers. But not all PMC drivers allow other drivers to memory map their GC region. This could create mem request conflict in watchdog driver. So this patch adds facility to allow PMC drivers to pass noreboot update function to watchdog drivers via platform data. Signed-off-by: Kuppuswamy Sathyanarayanan Acked-by: Guenter Roeck Signed-off-by: Andy Shevchenko --- drivers/watchdog/iTCO_wdt.c | 25 ++++++++++++++++++------- include/linux/platform_data/itco_wdt.h | 4 ++++ 2 files changed, 22 insertions(+), 7 deletions(-) diff --git a/drivers/watchdog/iTCO_wdt.c b/drivers/watchdog/iTCO_wdt.c index a62993381c52..347f0389b089 100644 --- a/drivers/watchdog/iTCO_wdt.c +++ b/drivers/watchdog/iTCO_wdt.c @@ -106,6 +106,8 @@ struct iTCO_wdt_private { struct pci_dev *pci_dev; /* whether or not the watchdog has been suspended */ bool suspended; + /* no reboot API private data */ + void *no_reboot_priv; /* no reboot update function pointer */ int (*update_no_reboot_bit)(void *p, bool set); }; @@ -217,14 +219,23 @@ static int update_no_reboot_bit_mem(void *priv, bool set) return 0; } -static void iTCO_wdt_no_reboot_bit_setup(struct iTCO_wdt_private *p) +static void iTCO_wdt_no_reboot_bit_setup(struct iTCO_wdt_private *p, + struct itco_wdt_platform_data *pdata) { + if (pdata->update_no_reboot_bit) { + p->update_no_reboot_bit = pdata->update_no_reboot_bit; + p->no_reboot_priv = pdata->no_reboot_priv; + return; + } + 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; else p->update_no_reboot_bit = update_no_reboot_bit_def; + + p->no_reboot_priv = p; } static int iTCO_wdt_start(struct watchdog_device *wd_dev) @@ -237,7 +248,7 @@ static int iTCO_wdt_start(struct watchdog_device *wd_dev) iTCO_vendor_pre_start(p->smi_res, wd_dev->timeout); /* disable chipset's NO_REBOOT bit */ - if (p->update_no_reboot_bit(p, false)) { + if (p->update_no_reboot_bit(p->no_reboot_priv, false)) { spin_unlock(&p->io_lock); pr_err("failed to reset NO_REBOOT flag, reboot disabled by hardware/BIOS\n"); return -EIO; @@ -278,7 +289,7 @@ static int iTCO_wdt_stop(struct watchdog_device *wd_dev) val = inw(TCO1_CNT(p)); /* Set the NO_REBOOT bit to prevent later reboots, just for sure */ - p->update_no_reboot_bit(p, true); + p->update_no_reboot_bit(p->no_reboot_priv, true); spin_unlock(&p->io_lock); @@ -443,13 +454,13 @@ static int iTCO_wdt_probe(struct platform_device *pdev) p->iTCO_version = pdata->version; p->pci_dev = to_pci_dev(dev->parent); - iTCO_wdt_no_reboot_bit_setup(p); + iTCO_wdt_no_reboot_bit_setup(p, pdata); /* * 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) { + if (p->iTCO_version >= 2 && !pdata->update_no_reboot_bit) { p->gcs_pmc_res = platform_get_resource(pdev, IORESOURCE_MEM, ICH_RES_MEM_GCS_PMC); @@ -459,14 +470,14 @@ static int iTCO_wdt_probe(struct platform_device *pdev) } /* Check chipset's NO_REBOOT bit */ - if (p->update_no_reboot_bit(p, false) && + if (p->update_no_reboot_bit(p->no_reboot_priv, false) && iTCO_vendor_check_noreboot_on()) { pr_info("unable to reset NO_REBOOT flag, device disabled by hardware/BIOS\n"); return -ENODEV; /* Cannot reset NO_REBOOT bit */ } /* Set the NO_REBOOT bit to prevent later reboots, just for sure */ - p->update_no_reboot_bit(p, true); + 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, diff --git a/include/linux/platform_data/itco_wdt.h b/include/linux/platform_data/itco_wdt.h index f16542c77ff7..0e95527edf25 100644 --- a/include/linux/platform_data/itco_wdt.h +++ b/include/linux/platform_data/itco_wdt.h @@ -14,6 +14,10 @@ struct itco_wdt_platform_data { char name[32]; unsigned int version; + /* private data to be passed to update_no_reboot_bit API */ + void *no_reboot_priv; + /* pointer for platform specific no reboot update function */ + int (*update_no_reboot_bit)(void *priv, bool set); }; #endif /* _ITCO_WDT_H_ */ -- 2.20.1