diff options
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/armada-37xx-cpufreq.c | 163 |
1 files changed, 160 insertions, 3 deletions
diff --git a/drivers/cpufreq/armada-37xx-cpufreq.c b/drivers/cpufreq/armada-37xx-cpufreq.c index 739da90ff3f6..75491fc841a6 100644 --- a/drivers/cpufreq/armada-37xx-cpufreq.c +++ b/drivers/cpufreq/armada-37xx-cpufreq.c @@ -51,6 +51,16 @@ #define ARMADA_37XX_DVFS_LOAD_2 2 #define ARMADA_37XX_DVFS_LOAD_3 3 +/* AVS register set */ +#define ARMADA_37XX_AVS_CTL0 0x0 +#define ARMADA_37XX_AVS_ENABLE BIT(30) +#define ARMADA_37XX_AVS_HIGH_VDD_LIMIT 16 +#define ARMADA_37XX_AVS_LOW_VDD_LIMIT 22 +#define ARMADA_37XX_AVS_VDD_MASK 0x3F +#define ARMADA_37XX_AVS_CTL2 0x8 +#define ARMADA_37XX_AVS_LOW_VDD_EN BIT(6) +#define ARMADA_37XX_AVS_VSET(x) (0x1C + 4 * (x)) + /* * On Armada 37xx the Power management manages 4 level of CPU load, * each level can be associated with a CPU clock source, a CPU @@ -58,6 +68,17 @@ */ #define LOAD_LEVEL_NR 4 +#define MIN_VOLT_MV 1000 + +/* AVS value for the corresponding voltage (in mV) */ +static int avs_map[] = { + 747, 758, 770, 782, 793, 805, 817, 828, 840, 852, 863, 875, 887, 898, + 910, 922, 933, 945, 957, 968, 980, 992, 1003, 1015, 1027, 1038, 1050, + 1062, 1073, 1085, 1097, 1108, 1120, 1132, 1143, 1155, 1167, 1178, 1190, + 1202, 1213, 1225, 1237, 1248, 1260, 1272, 1283, 1295, 1307, 1318, 1330, + 1342 +}; + struct armada37xx_cpufreq_state { struct regmap *regmap; u32 nb_l0l1; @@ -71,6 +92,7 @@ static struct armada37xx_cpufreq_state *armada37xx_cpufreq_state; struct armada_37xx_dvfs { u32 cpu_freq_max; u8 divider[LOAD_LEVEL_NR]; + u32 avs[LOAD_LEVEL_NR]; }; static struct armada_37xx_dvfs armada_37xx_dvfs[] = { @@ -148,6 +170,128 @@ static void __init armada37xx_cpufreq_dvfs_setup(struct regmap *base, clk_set_parent(clk, parent); } +/* + * Find out the armada 37x supported AVS value whose voltage value is + * the round-up closest to the target voltage value. + */ +static u32 armada_37xx_avs_val_match(int target_vm) +{ + u32 avs; + + /* Find out the round-up closest supported voltage value */ + for (avs = 0; avs < ARRAY_SIZE(avs_map); avs++) + if (avs_map[avs] >= target_vm) + break; + + /* + * If all supported voltages are smaller than target one, + * choose the largest supported voltage + */ + if (avs == ARRAY_SIZE(avs_map)) + avs = ARRAY_SIZE(avs_map) - 1; + + return avs; +} + +/* + * For Armada 37xx soc, L0(VSET0) VDD AVS value is set to SVC revision + * value or a default value when SVC is not supported. + * - L0 can be read out from the register of AVS_CTRL_0 and L0 voltage + * can be got from the mapping table of avs_map. + * - L1 voltage should be about 100mv smaller than L0 voltage + * - L2 & L3 voltage should be about 150mv smaller than L0 voltage. + * This function calculates L1 & L2 & L3 AVS values dynamically based + * on L0 voltage and fill all AVS values to the AVS value table. + */ +static void __init armada37xx_cpufreq_avs_configure(struct regmap *base, + struct armada_37xx_dvfs *dvfs) +{ + unsigned int target_vm; + int load_level = 0; + u32 l0_vdd_min; + + if (base == NULL) + return; + + /* Get L0 VDD min value */ + regmap_read(base, ARMADA_37XX_AVS_CTL0, &l0_vdd_min); + l0_vdd_min = (l0_vdd_min >> ARMADA_37XX_AVS_LOW_VDD_LIMIT) & + ARMADA_37XX_AVS_VDD_MASK; + if (l0_vdd_min >= ARRAY_SIZE(avs_map)) { + pr_err("L0 VDD MIN %d is not correct.\n", l0_vdd_min); + return; + } + dvfs->avs[0] = l0_vdd_min; + + if (avs_map[l0_vdd_min] <= MIN_VOLT_MV) { + /* + * If L0 voltage is smaller than 1000mv, then all VDD sets + * use L0 voltage; + */ + u32 avs_min = armada_37xx_avs_val_match(MIN_VOLT_MV); + + for (load_level = 1; load_level < LOAD_LEVEL_NR; load_level++) + dvfs->avs[load_level] = avs_min; + + return; + } + + /* + * L1 voltage is equal to L0 voltage - 100mv and it must be + * larger than 1000mv + */ + + target_vm = avs_map[l0_vdd_min] - 100; + target_vm = target_vm > MIN_VOLT_MV ? target_vm : MIN_VOLT_MV; + dvfs->avs[1] = armada_37xx_avs_val_match(target_vm); + + /* + * L2 & L3 voltage is equal to L0 voltage - 150mv and it must + * be larger than 1000mv + */ + target_vm = avs_map[l0_vdd_min] - 150; + target_vm = target_vm > MIN_VOLT_MV ? target_vm : MIN_VOLT_MV; + dvfs->avs[2] = dvfs->avs[3] = armada_37xx_avs_val_match(target_vm); +} + +static void __init armada37xx_cpufreq_avs_setup(struct regmap *base, + struct armada_37xx_dvfs *dvfs) +{ + unsigned int avs_val = 0, freq; + int load_level = 0; + + if (base == NULL) + return; + + /* Disable AVS before the configuration */ + regmap_update_bits(base, ARMADA_37XX_AVS_CTL0, + ARMADA_37XX_AVS_ENABLE, 0); + + + /* Enable low voltage mode */ + regmap_update_bits(base, ARMADA_37XX_AVS_CTL2, + ARMADA_37XX_AVS_LOW_VDD_EN, + ARMADA_37XX_AVS_LOW_VDD_EN); + + + for (load_level = 1; load_level < LOAD_LEVEL_NR; load_level++) { + freq = dvfs->cpu_freq_max / dvfs->divider[load_level]; + + avs_val = dvfs->avs[load_level]; + regmap_update_bits(base, ARMADA_37XX_AVS_VSET(load_level-1), + ARMADA_37XX_AVS_VDD_MASK << ARMADA_37XX_AVS_HIGH_VDD_LIMIT | + ARMADA_37XX_AVS_VDD_MASK << ARMADA_37XX_AVS_LOW_VDD_LIMIT, + avs_val << ARMADA_37XX_AVS_HIGH_VDD_LIMIT | + avs_val << ARMADA_37XX_AVS_LOW_VDD_LIMIT); + } + + /* Enable AVS after the configuration */ + regmap_update_bits(base, ARMADA_37XX_AVS_CTL0, + ARMADA_37XX_AVS_ENABLE, + ARMADA_37XX_AVS_ENABLE); + +} + static void armada37xx_cpufreq_disable_dvfs(struct regmap *base) { unsigned int reg = ARMADA_37XX_NB_DYN_MOD, @@ -216,7 +360,7 @@ static int __init armada37xx_cpufreq_driver_init(void) struct platform_device *pdev; unsigned long freq; unsigned int cur_frequency; - struct regmap *nb_pm_base; + struct regmap *nb_pm_base, *avs_base; struct device *cpu_dev; int load_lvl, ret; struct clk *clk; @@ -227,6 +371,14 @@ static int __init armada37xx_cpufreq_driver_init(void) if (IS_ERR(nb_pm_base)) return -ENODEV; + avs_base = + syscon_regmap_lookup_by_compatible("marvell,armada-3700-avs"); + + /* if AVS is not present don't use it but still try to setup dvfs */ + if (IS_ERR(avs_base)) { + pr_info("Syscon failed for Adapting Voltage Scaling: skip it\n"); + avs_base = NULL; + } /* Before doing any configuration on the DVFS first, disable it */ armada37xx_cpufreq_disable_dvfs(nb_pm_base); @@ -270,16 +422,21 @@ static int __init armada37xx_cpufreq_driver_init(void) armada37xx_cpufreq_state->regmap = nb_pm_base; + armada37xx_cpufreq_avs_configure(avs_base, dvfs); + armada37xx_cpufreq_avs_setup(avs_base, dvfs); + armada37xx_cpufreq_dvfs_setup(nb_pm_base, clk, dvfs->divider); clk_put(clk); for (load_lvl = ARMADA_37XX_DVFS_LOAD_0; load_lvl < LOAD_LEVEL_NR; load_lvl++) { + unsigned long u_volt = avs_map[dvfs->avs[load_lvl]] * 1000; freq = cur_frequency / dvfs->divider[load_lvl]; - - ret = dev_pm_opp_add(cpu_dev, freq, 0); + ret = dev_pm_opp_add(cpu_dev, freq, u_volt); if (ret) goto remove_opp; + + } /* Now that everything is setup, enable the DVFS at hardware level */ |