diff options
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/iTCO_wdt.c | 83 |
1 files changed, 50 insertions, 33 deletions
diff --git a/drivers/watchdog/iTCO_wdt.c b/drivers/watchdog/iTCO_wdt.c index 3d0abc0d59b4..a62993381c52 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 update function pointer */ + int (*update_no_reboot_bit)(void *p, bool set); }; /* module parameters */ @@ -170,48 +172,61 @@ static inline u32 no_reboot_bit(struct iTCO_wdt_private *p) return enable_bit; } -static void iTCO_wdt_set_NO_REBOOT_bit(struct iTCO_wdt_private *p) +static int update_no_reboot_bit_def(void *priv, bool set) { - u32 val32; - - /* Set the NO_REBOOT bit: this disables reboots */ - if (p->iTCO_version >= 2) { - val32 = readl(p->gcs_pmc); - val32 |= no_reboot_bit(p); - writel(val32, p->gcs_pmc); - } else if (p->iTCO_version == 1) { - pci_read_config_dword(p->pci_dev, 0xd4, &val32); - val32 |= no_reboot_bit(p); - pci_write_config_dword(p->pci_dev, 0xd4, val32); - } + return 0; } -static int iTCO_wdt_unset_NO_REBOOT_bit(struct iTCO_wdt_private *p) +static int update_no_reboot_bit_pci(void *priv, bool set) { - u32 enable_bit = no_reboot_bit(p); - u32 val32 = 0; + struct iTCO_wdt_private *p = priv; + u32 val32 = 0, newval32 = 0; - /* Unset the NO_REBOOT bit: this enables reboots */ - if (p->iTCO_version >= 2) { - val32 = readl(p->gcs_pmc); - val32 &= ~enable_bit; - writel(val32, p->gcs_pmc); + pci_read_config_dword(p->pci_dev, 0xd4, &val32); + if (set) + val32 |= no_reboot_bit(p); + else + val32 &= ~no_reboot_bit(p); + pci_write_config_dword(p->pci_dev, 0xd4, val32); + pci_read_config_dword(p->pci_dev, 0xd4, &newval32); - val32 = readl(p->gcs_pmc); - } else if (p->iTCO_version == 1) { - pci_read_config_dword(p->pci_dev, 0xd4, &val32); - val32 &= ~enable_bit; - pci_write_config_dword(p->pci_dev, 0xd4, val32); + /* make sure the update is successful */ + if (val32 != newval32) + return -EIO; - pci_read_config_dword(p->pci_dev, 0xd4, &val32); - } + return 0; +} + +static int update_no_reboot_bit_mem(void *priv, bool set) +{ + struct iTCO_wdt_private *p = priv; + u32 val32 = 0, newval32 = 0; + + val32 = readl(p->gcs_pmc); + if (set) + val32 |= no_reboot_bit(p); + else + val32 &= ~no_reboot_bit(p); + writel(val32, p->gcs_pmc); + newval32 = readl(p->gcs_pmc); - if (val32 & enable_bit) + /* make sure the update is successful */ + if (val32 != newval32) return -EIO; return 0; } +static void iTCO_wdt_no_reboot_bit_setup(struct iTCO_wdt_private *p) +{ + 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; +} + static int iTCO_wdt_start(struct watchdog_device *wd_dev) { struct iTCO_wdt_private *p = watchdog_get_drvdata(wd_dev); @@ -222,7 +237,7 @@ 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 (iTCO_wdt_unset_NO_REBOOT_bit(p)) { + if (p->update_no_reboot_bit(p, false)) { spin_unlock(&p->io_lock); pr_err("failed to reset NO_REBOOT flag, reboot disabled by hardware/BIOS\n"); return -EIO; @@ -263,7 +278,7 @@ 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 */ - iTCO_wdt_set_NO_REBOOT_bit(p); + p->update_no_reboot_bit(p, true); spin_unlock(&p->io_lock); @@ -428,6 +443,8 @@ 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); + /* * Get the Memory-Mapped GCS or PMC register, we need it for the * NO_REBOOT flag (TCO v2 and v3). @@ -442,14 +459,14 @@ static int iTCO_wdt_probe(struct platform_device *pdev) } /* Check chipset's NO_REBOOT bit */ - if (iTCO_wdt_unset_NO_REBOOT_bit(p) && + if (p->update_no_reboot_bit(p, 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 */ - iTCO_wdt_set_NO_REBOOT_bit(p); + p->update_no_reboot_bit(p, true); /* The TCO logic uses the TCO_EN bit in the SMI_EN register */ if (!devm_request_region(dev, p->smi_res->start, |