diff options
author | Li, Aubrey <aubrey.li@linux.intel.com> | 2014-06-30 14:09:38 +0800 |
---|---|---|
committer | H. Peter Anvin <hpa@linux.intel.com> | 2014-07-25 14:11:58 -0700 |
commit | b00055cade45379fb6a51798b70ef520d7555c5f (patch) | |
tree | 2cfa8e89e2317a1c25c141d4b7177352e3a1946b /arch/x86/kernel | |
parent | 93e5eadd1f6e7f45c31aa327c42ac52e4df5ff6f (diff) | |
download | linux-b00055cade45379fb6a51798b70ef520d7555c5f.tar.bz2 |
x86/pmc_atom: Eisable a few S0ix wake up events for S0ix residency
Disable PMC S0IX_WAKE_EN events coming from LPC block(unused) and
also from GPIO_SUS ored dedicated IRQs (must be disabled as per PMC
programming rule), GPIOSCORE ored dedicated IRQs (must be disabled
as per PMC programming rule), GPIO_SUS shared IRQ (not necessary
since the IOAPIC_DS wake event will still work), GPIO_SCORE shared
IRQ (not necessary since the IOAPIC_DS wake event will still work).
Signed-off-by: Aubrey Li <aubrey.li@linux.intel.com>
Link: http://lkml.kernel.org/r/53B0FF22.5080403@linux.intel.com
Signed-off-by: Olivier Leveque <olivier.leveque@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/kernel')
-rw-r--r-- | arch/x86/kernel/pmc_atom.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/arch/x86/kernel/pmc_atom.c b/arch/x86/kernel/pmc_atom.c index 9eb79f6fc512..d6cc0e9eee54 100644 --- a/arch/x86/kernel/pmc_atom.c +++ b/arch/x86/kernel/pmc_atom.c @@ -23,8 +23,24 @@ #include <asm/pmc_atom.h> +struct pmc_dev { + u32 base_addr; + void __iomem *regmap; +}; + +static struct pmc_dev pmc_device; static u32 acpi_base_addr; +static inline u32 pmc_reg_read(struct pmc_dev *pmc, int reg_offset) +{ + return readl(pmc->regmap + reg_offset); +} + +static inline void pmc_reg_write(struct pmc_dev *pmc, int reg_offset, u32 val) +{ + writel(val, pmc->regmap + reg_offset); +} + static void pmc_power_off(void) { u16 pm1_cnt_port; @@ -42,8 +58,23 @@ static void pmc_power_off(void) outl(pm1_cnt_value, pm1_cnt_port); } +static void pmc_hw_reg_setup(struct pmc_dev *pmc) +{ + /* + * Disable PMC S0IX_WAKE_EN events coming from: + * - LPC clock run + * - GPIO_SUS ored dedicated IRQs + * - GPIO_SCORE ored dedicated IRQs + * - GPIO_SUS shared IRQ + * - GPIO_SCORE shared IRQ + */ + pmc_reg_write(pmc, PMC_S0IX_WAKE_EN, (u32)PMC_WAKE_EN_SETTING); +} + static int pmc_setup_dev(struct pci_dev *pdev) { + struct pmc_dev *pmc = &pmc_device; + /* Obtain ACPI base address */ pci_read_config_dword(pdev, ACPI_BASE_ADDR_OFFSET, &acpi_base_addr); acpi_base_addr &= ACPI_BASE_ADDR_MASK; @@ -52,6 +83,17 @@ static int pmc_setup_dev(struct pci_dev *pdev) if (acpi_base_addr != 0 && pm_power_off == NULL) pm_power_off = pmc_power_off; + pci_read_config_dword(pdev, PMC_BASE_ADDR_OFFSET, &pmc->base_addr); + pmc->base_addr &= PMC_BASE_ADDR_MASK; + + pmc->regmap = ioremap_nocache(pmc->base_addr, PMC_MMIO_REG_LEN); + if (!pmc->regmap) { + dev_err(&pdev->dev, "error: ioremap failed\n"); + return -ENOMEM; + } + + /* PMC hardware registers setup */ + pmc_hw_reg_setup(pmc); return 0; } |