diff options
| -rw-r--r-- | src/soc/intel/common/block/include/intelblocks/pmclib.h | 9 | ||||
| -rw-r--r-- | src/soc/intel/common/block/pmc/pmclib.c | 127 |
2 files changed, 136 insertions, 0 deletions
diff --git a/src/soc/intel/common/block/include/intelblocks/pmclib.h b/src/soc/intel/common/block/include/intelblocks/pmclib.h index 2b06a504d4..2123c4a6b7 100644 --- a/src/soc/intel/common/block/include/intelblocks/pmclib.h +++ b/src/soc/intel/common/block/include/intelblocks/pmclib.h @@ -220,4 +220,13 @@ void pmc_soc_set_afterg3_en(bool on); */ void pmc_set_power_failure_state(bool target_on); +/* + * This function ensures that the duration programmed in the PchPmPwrCycDur will never be + * smaller than the SLP_Sx assertion widths. + * If the pm_pwr_cyc_dur is less than any of the SLP_Sx assertion widths then it returns the + * default value PCH_PM_PWR_CYC_DUR. + */ +uint8_t get_pm_pwr_cyc_dur(uint8_t slp_s4_min_assert, uint8_t slp_s3_min_assert, + uint8_t slp_a_min_assert, uint8_t pm_pwr_cyc_dur); + #endif /* SOC_INTEL_COMMON_BLOCK_PMCLIB_H */ diff --git a/src/soc/intel/common/block/pmc/pmclib.c b/src/soc/intel/common/block/pmc/pmclib.c index 40d407bc78..ad9c4fec3d 100644 --- a/src/soc/intel/common/block/pmc/pmclib.c +++ b/src/soc/intel/common/block/pmc/pmclib.c @@ -18,6 +18,38 @@ static struct chipset_power_state power_state; +/* List of Minimum Assertion durations in microseconds */ +enum min_assert_dur { + MinAssertDur0s = 0, + MinAssertDur60us = 60, + MinAssertDur1ms = 1000, + MinAssertDur50ms = 50000, + MinAssertDur98ms = 98000, + MinAssertDur500ms = 500000, + MinAssertDur1s = 1000000, + MinAssertDur2s = 2000000, + MinAssertDur3s = 3000000, + MinAssertDur4s = 4000000, +}; + +/* Signal Assertion duration values */ +struct cfg_assert_dur { + /* Minimum assertion duration of SLP_A signal */ + enum min_assert_dur slp_a; + + /* Minimum assertion duration of SLP_4 signal */ + enum min_assert_dur slp_s4; + + /* Minimum assertion duration of SLP_3 signal */ + enum min_assert_dur slp_s3; + + /* PCH PM Power Cycle duration */ + enum min_assert_dur pm_pwr_cyc_dur; +}; + +/* Default value of PchPmPwrCycDur */ +#define PCH_PM_PWR_CYC_DUR 0 + struct chipset_power_state *pmc_get_power_state(void) { struct chipset_power_state *ptr = NULL; @@ -573,3 +605,98 @@ void pmc_set_power_failure_state(const bool target_on) pmc_soc_set_afterg3_en(on); } + +/* This function returns the highest assertion duration of the SLP_Sx assertion widths */ +static enum min_assert_dur get_high_assert_width(const struct cfg_assert_dur *cfg_assert_dur) +{ + enum min_assert_dur max_assert_dur = cfg_assert_dur->slp_s4; + + if (max_assert_dur < cfg_assert_dur->slp_s3) + max_assert_dur = cfg_assert_dur->slp_s3; + + if (max_assert_dur < cfg_assert_dur->slp_a) + max_assert_dur = cfg_assert_dur->slp_a; + + return max_assert_dur; +} + +/* This function converts assertion durations from register-encoded to microseconds */ +static void get_min_assert_dur(uint8_t slp_s4_min_assert, uint8_t slp_s3_min_assert, + uint8_t slp_a_min_assert, uint8_t pm_pwr_cyc_dur, + struct cfg_assert_dur *cfg_assert_dur) +{ + /* + * Ensure slp_x_dur_list[] elements in the devicetree config are in sync with + * FSP encoded values. + */ + + /* slp_s4_assert_dur_list : 1s, 1s(default), 2s, 3s, 4s */ + const enum min_assert_dur slp_s4_assert_dur_list[] = { + MinAssertDur1s, MinAssertDur1s, MinAssertDur2s, MinAssertDur3s, MinAssertDur4s + }; + + /* slp_s3_assert_dur_list: 50ms, 60us, 1ms, 50ms (Default), 2s */ + const enum min_assert_dur slp_s3_assert_dur_list[] = { + MinAssertDur50ms, MinAssertDur60us, MinAssertDur1ms, MinAssertDur50ms, + MinAssertDur2s + }; + + /* slp_a_assert_dur_list: 2s, 0s, 4s, 98ms, 2s(Default) */ + const enum min_assert_dur slp_a_assert_dur_list[] = { + MinAssertDur2s, MinAssertDur0s, MinAssertDur4s, MinAssertDur98ms, MinAssertDur2s + }; + + /* pm_pwr_cyc_dur_list: 4s(Default), 1s, 2s, 3s, 4s */ + const enum min_assert_dur pm_pwr_cyc_dur_list[] = { + MinAssertDur4s, MinAssertDur1s, MinAssertDur2s, MinAssertDur3s, MinAssertDur4s + }; + + /* Get signal assertion width */ + if (slp_s4_min_assert < ARRAY_SIZE(slp_s4_assert_dur_list)) + cfg_assert_dur->slp_s4 = slp_s4_assert_dur_list[slp_s4_min_assert]; + + if (slp_s3_min_assert < ARRAY_SIZE(slp_s3_assert_dur_list)) + cfg_assert_dur->slp_s3 = slp_s3_assert_dur_list[slp_s3_min_assert]; + + if (slp_a_min_assert < ARRAY_SIZE(slp_a_assert_dur_list)) + cfg_assert_dur->slp_a = slp_a_assert_dur_list[slp_a_min_assert]; + + if (pm_pwr_cyc_dur < ARRAY_SIZE(pm_pwr_cyc_dur_list)) + cfg_assert_dur->pm_pwr_cyc_dur = pm_pwr_cyc_dur_list[pm_pwr_cyc_dur]; +} + +/* + * This function ensures that the duration programmed in the PchPmPwrCycDur will never be + * smaller than the SLP_Sx assertion widths. + * If the pm_pwr_cyc_dur is less than any of the SLP_Sx assertion widths then it returns the + * default value PCH_PM_PWR_CYC_DUR. + */ +uint8_t get_pm_pwr_cyc_dur(uint8_t slp_s4_min_assert, uint8_t slp_s3_min_assert, + uint8_t slp_a_min_assert, uint8_t pm_pwr_cyc_dur) +{ + /* Set default values for the minimum assertion duration */ + struct cfg_assert_dur cfg_assert_dur = { + .slp_a = MinAssertDur2s, + .slp_s4 = MinAssertDur1s, + .slp_s3 = MinAssertDur50ms, + .pm_pwr_cyc_dur = MinAssertDur4s + }; + + enum min_assert_dur high_assert_width; + + /* Convert assertion durations from register-encoded to microseconds */ + get_min_assert_dur(slp_s4_min_assert, slp_s3_min_assert, slp_a_min_assert, + pm_pwr_cyc_dur, &cfg_assert_dur); + + /* Get the highest assertion duration among PCH EDS specified signals for pwr_cyc_dur */ + high_assert_width = get_high_assert_width(&cfg_assert_dur); + + if (cfg_assert_dur.pm_pwr_cyc_dur >= high_assert_width) + return pm_pwr_cyc_dur; + + printk(BIOS_DEBUG, + "Set PmPwrCycDur to 4s as configured PmPwrCycDur (%d) violates PCH EDS " + "spec\n", pm_pwr_cyc_dur); + + return PCH_PM_PWR_CYC_DUR; +} |