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platform/x86/intel: pmc/core: Add Alder Lake low power mode support f…
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…or pmc core

Alder Lake has 14 status registers that are memory mapped. These
registers show the status of the low power mode requirements. The
registers are latched on every C10 entry or exit and on every s0ix.y
entry/exit. Accessing these registers is useful for debugging any low
power related activities.

Thus, add debugfs entry to access low power mode status registers.

Cc: Chao Qin <chao.qin@intel.com>
Cc: Srinivas Pandruvada <srinivas.pandruvada@intel.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: David Box <david.e.box@intel.com>
Tested-by: You-Sheng Yang <vicamo.yang@canonical.com>
Acked-by: Rajneesh Bhardwaj <irenic.rajneesh@gmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Gayatri Kammela <gayatri.kammela@intel.com>
Link: https://lore.kernel.org/r/d27ec98589a5aaa569bbce0e937ed03779fc0a22.1629091915.git.gayatri.kammela@intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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Gayatri Kammela authored and Hans de Goede committed Aug 20, 2021
1 parent ee7e89f commit 6cfce3e
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194 changes: 194 additions & 0 deletions drivers/platform/x86/intel/pmc/core.c
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Original file line number Diff line number Diff line change
Expand Up @@ -736,6 +736,189 @@ static const struct pmc_bit_map adl_ltr_show_map[] = {
{}
};

static const struct pmc_bit_map adl_clocksource_status_map[] = {
{"CLKPART1_OFF_STS", BIT(0)},
{"CLKPART2_OFF_STS", BIT(1)},
{"CLKPART3_OFF_STS", BIT(2)},
{"CLKPART4_OFF_STS", BIT(3)},
{"CLKPART5_OFF_STS", BIT(4)},
{"CLKPART6_OFF_STS", BIT(5)},
{"CLKPART7_OFF_STS", BIT(6)},
{"CLKPART8_OFF_STS", BIT(7)},
{"PCIE0PLL_OFF_STS", BIT(10)},
{"PCIE1PLL_OFF_STS", BIT(11)},
{"PCIE2PLL_OFF_STS", BIT(12)},
{"PCIE3PLL_OFF_STS", BIT(13)},
{"PCIE4PLL_OFF_STS", BIT(14)},
{"PCIE5PLL_OFF_STS", BIT(15)},
{"PCIE6PLL_OFF_STS", BIT(16)},
{"USB2PLL_OFF_STS", BIT(18)},
{"OCPLL_OFF_STS", BIT(22)},
{"AUDIOPLL_OFF_STS", BIT(23)},
{"GBEPLL_OFF_STS", BIT(24)},
{"Fast_XTAL_Osc_OFF_STS", BIT(25)},
{"AC_Ring_Osc_OFF_STS", BIT(26)},
{"MC_Ring_Osc_OFF_STS", BIT(27)},
{"SATAPLL_OFF_STS", BIT(29)},
{"USB3PLL_OFF_STS", BIT(31)},
{}
};

static const struct pmc_bit_map adl_power_gating_status_0_map[] = {
{"PMC_PGD0_PG_STS", BIT(0)},
{"DMI_PGD0_PG_STS", BIT(1)},
{"ESPISPI_PGD0_PG_STS", BIT(2)},
{"XHCI_PGD0_PG_STS", BIT(3)},
{"SPA_PGD0_PG_STS", BIT(4)},
{"SPB_PGD0_PG_STS", BIT(5)},
{"SPC_PGD0_PG_STS", BIT(6)},
{"GBE_PGD0_PG_STS", BIT(7)},
{"SATA_PGD0_PG_STS", BIT(8)},
{"DSP_PGD0_PG_STS", BIT(9)},
{"DSP_PGD1_PG_STS", BIT(10)},
{"DSP_PGD2_PG_STS", BIT(11)},
{"DSP_PGD3_PG_STS", BIT(12)},
{"SPD_PGD0_PG_STS", BIT(13)},
{"LPSS_PGD0_PG_STS", BIT(14)},
{"SMB_PGD0_PG_STS", BIT(16)},
{"ISH_PGD0_PG_STS", BIT(17)},
{"NPK_PGD0_PG_STS", BIT(19)},
{"PECI_PGD0_PG_STS", BIT(21)},
{"XDCI_PGD0_PG_STS", BIT(25)},
{"EXI_PGD0_PG_STS", BIT(26)},
{"CSE_PGD0_PG_STS", BIT(27)},
{"KVMCC_PGD0_PG_STS", BIT(28)},
{"PMT_PGD0_PG_STS", BIT(29)},
{"CLINK_PGD0_PG_STS", BIT(30)},
{"PTIO_PGD0_PG_STS", BIT(31)},
{}
};

static const struct pmc_bit_map adl_power_gating_status_1_map[] = {
{"USBR0_PGD0_PG_STS", BIT(0)},
{"SMT1_PGD0_PG_STS", BIT(2)},
{"CSMERTC_PGD0_PG_STS", BIT(6)},
{"CSMEPSF_PGD0_PG_STS", BIT(7)},
{"CNVI_PGD0_PG_STS", BIT(19)},
{"DSP_PGD4_PG_STS", BIT(26)},
{"SPG_PGD0_PG_STS", BIT(27)},
{"SPE_PGD0_PG_STS", BIT(28)},
{}
};

static const struct pmc_bit_map adl_power_gating_status_2_map[] = {
{"THC0_PGD0_PG_STS", BIT(7)},
{"THC1_PGD0_PG_STS", BIT(8)},
{"SPF_PGD0_PG_STS", BIT(14)},
{}
};

static const struct pmc_bit_map adl_d3_status_0_map[] = {
{"ISH_D3_STS", BIT(2)},
{"LPSS_D3_STS", BIT(3)},
{"XDCI_D3_STS", BIT(4)},
{"XHCI_D3_STS", BIT(5)},
{"SPA_D3_STS", BIT(12)},
{"SPB_D3_STS", BIT(13)},
{"SPC_D3_STS", BIT(14)},
{"SPD_D3_STS", BIT(15)},
{"SPE_D3_STS", BIT(16)},
{"DSP_D3_STS", BIT(19)},
{"SATA_D3_STS", BIT(20)},
{"DMI_D3_STS", BIT(22)},
{}
};

static const struct pmc_bit_map adl_d3_status_1_map[] = {
{"GBE_D3_STS", BIT(19)},
{"CNVI_D3_STS", BIT(27)},
{}
};

static const struct pmc_bit_map adl_d3_status_2_map[] = {
{"CSMERTC_D3_STS", BIT(1)},
{"CSE_D3_STS", BIT(4)},
{"KVMCC_D3_STS", BIT(5)},
{"USBR0_D3_STS", BIT(6)},
{"SMT1_D3_STS", BIT(8)},
{"PTIO_D3_STS", BIT(16)},
{"PMT_D3_STS", BIT(17)},
{}
};

static const struct pmc_bit_map adl_d3_status_3_map[] = {
{"THC0_D3_STS", BIT(14)},
{"THC1_D3_STS", BIT(15)},
{}
};

static const struct pmc_bit_map adl_vnn_req_status_0_map[] = {
{"ISH_VNN_REQ_STS", BIT(2)},
{"ESPISPI_VNN_REQ_STS", BIT(18)},
{"DSP_VNN_REQ_STS", BIT(19)},
{}
};

static const struct pmc_bit_map adl_vnn_req_status_1_map[] = {
{"NPK_VNN_REQ_STS", BIT(4)},
{"EXI_VNN_REQ_STS", BIT(9)},
{"GBE_VNN_REQ_STS", BIT(19)},
{"SMB_VNN_REQ_STS", BIT(25)},
{"CNVI_VNN_REQ_STS", BIT(27)},
{}
};

static const struct pmc_bit_map adl_vnn_req_status_2_map[] = {
{"CSMERTC_VNN_REQ_STS", BIT(1)},
{"CSE_VNN_REQ_STS", BIT(4)},
{"SMT1_VNN_REQ_STS", BIT(8)},
{"CLINK_VNN_REQ_STS", BIT(14)},
{"GPIOCOM4_VNN_REQ_STS", BIT(20)},
{"GPIOCOM3_VNN_REQ_STS", BIT(21)},
{"GPIOCOM2_VNN_REQ_STS", BIT(22)},
{"GPIOCOM1_VNN_REQ_STS", BIT(23)},
{"GPIOCOM0_VNN_REQ_STS", BIT(24)},
{}
};

static const struct pmc_bit_map adl_vnn_req_status_3_map[] = {
{"GPIOCOM5_VNN_REQ_STS", BIT(11)},
{}
};

static const struct pmc_bit_map adl_vnn_misc_status_map[] = {
{"CPU_C10_REQ_STS", BIT(0)},
{"PCIe_LPM_En_REQ_STS", BIT(3)},
{"ITH_REQ_STS", BIT(5)},
{"CNVI_REQ_STS", BIT(6)},
{"ISH_REQ_STS", BIT(7)},
{"USB2_SUS_PG_Sys_REQ_STS", BIT(10)},
{"PCIe_Clk_REQ_STS", BIT(12)},
{"MPHY_Core_DL_REQ_STS", BIT(16)},
{"Break-even_En_REQ_STS", BIT(17)},
{"MPHY_SUS_REQ_STS", BIT(22)},
{"xDCI_attached_REQ_STS", BIT(24)},
{}
};

static const struct pmc_bit_map *adl_lpm_maps[] = {
adl_clocksource_status_map,
adl_power_gating_status_0_map,
adl_power_gating_status_1_map,
adl_power_gating_status_2_map,
adl_d3_status_0_map,
adl_d3_status_1_map,
adl_d3_status_2_map,
adl_d3_status_3_map,
adl_vnn_req_status_0_map,
adl_vnn_req_status_1_map,
adl_vnn_req_status_2_map,
adl_vnn_req_status_3_map,
adl_vnn_misc_status_map,
tgl_signal_status_map,
NULL
};

static const struct pmc_reg_map adl_reg_map = {
.pfear_sts = ext_adl_pfear_map,
.slp_s0_offset = ADL_PMC_SLP_S0_RES_COUNTER_OFFSET,
Expand All @@ -749,6 +932,17 @@ static const struct pmc_reg_map adl_reg_map = {
.pm_cfg_offset = CNP_PMC_PM_CFG_OFFSET,
.pm_read_disable_bit = CNP_PMC_READ_DISABLE_BIT,
.ltr_ignore_max = ADL_NUM_IP_IGN_ALLOWED,
.lpm_num_modes = ADL_LPM_NUM_MODES,
.lpm_num_maps = ADL_LPM_NUM_MAPS,
.lpm_res_counter_step_x2 = TGL_PMC_LPM_RES_COUNTER_STEP_X2,
.etr3_offset = ETR3_OFFSET,
.lpm_sts_latch_en_offset = ADL_LPM_STATUS_LATCH_EN_OFFSET,
.lpm_priority_offset = ADL_LPM_PRI_OFFSET,
.lpm_en_offset = ADL_LPM_EN_OFFSET,
.lpm_residency_offset = ADL_LPM_RESIDENCY_OFFSET,
.lpm_sts = adl_lpm_maps,
.lpm_status_offset = ADL_LPM_STATUS_OFFSET,
.lpm_live_status_offset = ADL_LPM_LIVE_STATUS_OFFSET,
};

static inline u32 pmc_core_reg_read(struct pmc_dev *pmcdev, int reg_offset)
Expand Down
13 changes: 13 additions & 0 deletions drivers/platform/x86/intel/pmc/core.h
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Original file line number Diff line number Diff line change
Expand Up @@ -224,6 +224,18 @@ enum ppfear_regs {
/* Extended Test Mode Register LPM bits (TGL and later */
#define ETR3_CLEAR_LPM_EVENTS BIT(28)

/* Alder Lake Power Management Controller register offsets */
#define ADL_LPM_EN_OFFSET 0x179C
#define ADL_LPM_RESIDENCY_OFFSET 0x17A4
#define ADL_LPM_NUM_MODES 2
#define ADL_LPM_NUM_MAPS 14

/* Alder Lake Low Power Mode debug registers */
#define ADL_LPM_STATUS_OFFSET 0x170C
#define ADL_LPM_PRI_OFFSET 0x17A0
#define ADL_LPM_STATUS_LATCH_EN_OFFSET 0x1704
#define ADL_LPM_LIVE_STATUS_OFFSET 0x1764

const char *pmc_lpm_modes[] = {
"S0i2.0",
"S0i2.1",
Expand Down Expand Up @@ -283,6 +295,7 @@ struct pmc_reg_map {
const u32 pm_vric1_offset;
/* Low Power Mode registers */
const int lpm_num_maps;
const int lpm_num_modes;
const int lpm_res_counter_step_x2;
const u32 lpm_sts_latch_en_offset;
const u32 lpm_en_offset;
Expand Down

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