diff options
| -rw-r--r-- | drivers/watchdog/sp5100_tco.c | 62 |
1 files changed, 29 insertions, 33 deletions
diff --git a/drivers/watchdog/sp5100_tco.c b/drivers/watchdog/sp5100_tco.c index 0e816f2cdb07..5a13ab483c50 100644 --- a/drivers/watchdog/sp5100_tco.c +++ b/drivers/watchdog/sp5100_tco.c @@ -396,48 +396,44 @@ static int sp5100_tco_setupdevice(void) pr_debug("Got 0x%04x from indirect I/O\n", val); /* Check MMIO address conflict */ - if (request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE, - dev_name)) - goto setup_wdt; - else + if (!request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE, + dev_name)) { pr_debug("MMIO address 0x%04x already in use\n", val); + /* + * Secondly, Find the watchdog timer MMIO address + * from SBResource_MMIO register. + */ + if (tco_has_sp5100_reg_layout(sp5100_tco_pci)) { + /* Read SBResource_MMIO from PCI config(PCI_Reg: 9Ch) */ + pci_read_config_dword(sp5100_tco_pci, + SP5100_SB_RESOURCE_MMIO_BASE, + &val); + } else { + /* Read SBResource_MMIO from AcpiMmioEn(PM_Reg: 24h) */ + val = sp5100_tco_read_pm_reg32(SB800_PM_ACPI_MMIO_EN); + } - /* - * Secondly, Find the watchdog timer MMIO address - * from SBResource_MMIO register. - */ - if (tco_has_sp5100_reg_layout(sp5100_tco_pci)) { - /* Read SBResource_MMIO from PCI config(PCI_Reg: 9Ch) */ - pci_read_config_dword(sp5100_tco_pci, - SP5100_SB_RESOURCE_MMIO_BASE, &val); - } else { - /* Read SBResource_MMIO from AcpiMmioEn(PM_Reg: 24h) */ - val = sp5100_tco_read_pm_reg32(SB800_PM_ACPI_MMIO_EN); - } - - /* The SBResource_MMIO is enabled and mapped memory space? */ - if ((val & (SB800_ACPI_MMIO_DECODE_EN | SB800_ACPI_MMIO_SEL)) == + /* The SBResource_MMIO is enabled and mapped memory space? */ + if ((val & (SB800_ACPI_MMIO_DECODE_EN | SB800_ACPI_MMIO_SEL)) != SB800_ACPI_MMIO_DECODE_EN) { + pr_notice("failed to find MMIO address, giving up.\n"); + ret = -ENODEV; + goto unreg_region; + } /* Clear unnecessary the low twelve bits */ val &= ~0xFFF; /* Add the Watchdog Timer offset to base address. */ val += SB800_PM_WDT_MMIO_OFFSET; /* Check MMIO address conflict */ - if (request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE, - dev_name)) { - pr_debug("Got 0x%04x from SBResource_MMIO register\n", - val); - goto setup_wdt; - } else + if (!request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE, + dev_name)) { pr_debug("MMIO address 0x%04x already in use\n", val); - } else - pr_debug("SBResource_MMIO is disabled(0x%04x)\n", val); - - pr_notice("failed to find MMIO address, giving up.\n"); - ret = -ENODEV; - goto unreg_region; + ret = -EBUSY; + goto unreg_region; + } + pr_debug("Got 0x%04x from SBResource_MMIO register\n", val); + } -setup_wdt: tcobase_phys = val; tcobase = ioremap(val, SP5100_WDT_MEM_MAP_SIZE); @@ -472,7 +468,7 @@ setup_wdt: tco_timer_stop(); release_region(SP5100_IO_PM_INDEX_REG, SP5100_PM_IOPORTS_SIZE); - /* Done */ + return 0; unreg_mem_region: |