soc: qcom: spm: add support for voltage regulator
The SPM / SAW2 device also provides a voltage regulator functionality with optional AVS (Adaptive Voltage Scaling) support. The exact register sequence and voltage ranges differs from device to device. Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Acked-by: Konrad Dybcio <konrad.dybcio@linaro.org> Link: https://lore.kernel.org/r/20240102-saw2-spm-regulator-v7-5-0472ec237f49@linaro.org Signed-off-by: Bjorn Andersson <andersson@kernel.org>
This commit is contained in:
Dmitry Baryshkov
Bjorn Andersson
parent
57e2b067f1
commit
6496dba142
@ -6,20 +6,40 @@
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* SAW power controller driver
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*/
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#include <linux/kernel.h>
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#include <linux/bitfield.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/iopoll.h>
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#include <linux/kernel.h>
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#include <linux/linear_range.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/smp.h>
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#include <linux/regulator/driver.h>
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#include <soc/qcom/spm.h>
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#define FIELD_SET(current, mask, val) \
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(((current) & ~(mask)) | FIELD_PREP((mask), (val)))
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#define SPM_CTL_INDEX 0x7f
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#define SPM_CTL_INDEX_SHIFT 4
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#define SPM_CTL_EN BIT(0)
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/* These registers might be specific to SPM 1.1 */
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#define SPM_VCTL_VLVL GENMASK(7, 0)
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#define SPM_PMIC_DATA_0_VLVL GENMASK(7, 0)
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#define SPM_PMIC_DATA_1_MIN_VSEL GENMASK(5, 0)
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#define SPM_PMIC_DATA_1_MAX_VSEL GENMASK(21, 16)
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#define SPM_1_1_AVS_CTL_AVS_ENABLED BIT(27)
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#define SPM_AVS_CTL_MAX_VLVL GENMASK(22, 17)
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#define SPM_AVS_CTL_MIN_VLVL GENMASK(15, 10)
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enum spm_reg {
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SPM_REG_CFG,
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SPM_REG_SPM_CTL,
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@ -29,10 +49,12 @@ enum spm_reg {
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SPM_REG_PMIC_DATA_1,
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SPM_REG_VCTL,
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SPM_REG_SEQ_ENTRY,
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SPM_REG_SPM_STS,
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SPM_REG_STS0,
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SPM_REG_STS1,
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SPM_REG_PMIC_STS,
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SPM_REG_AVS_CTL,
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SPM_REG_AVS_LIMIT,
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SPM_REG_RST,
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SPM_REG_NR,
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};
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@ -49,11 +71,20 @@ struct spm_reg_data {
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u32 avs_limit;
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u8 seq[MAX_SEQ_DATA];
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u8 start_index[PM_SLEEP_MODE_NR];
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smp_call_func_t set_vdd;
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/* for now we support only a single range */
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struct linear_range *range;
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unsigned int ramp_delay;
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unsigned int init_uV;
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};
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struct spm_driver_data {
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void __iomem *reg_base;
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const struct spm_reg_data *reg_data;
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struct device *dev;
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unsigned int volt_sel;
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int reg_cpu;
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};
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static const u16 spm_reg_offset_v4_1[SPM_REG_NR] = {
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@ -189,6 +220,10 @@ static const struct spm_reg_data spm_reg_8226_cpu = {
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static const u16 spm_reg_offset_v1_1[SPM_REG_NR] = {
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[SPM_REG_CFG] = 0x08,
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[SPM_REG_STS0] = 0x0c,
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[SPM_REG_STS1] = 0x10,
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[SPM_REG_VCTL] = 0x14,
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[SPM_REG_AVS_CTL] = 0x18,
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[SPM_REG_SPM_CTL] = 0x20,
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[SPM_REG_PMIC_DLY] = 0x24,
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[SPM_REG_PMIC_DATA_0] = 0x28,
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@ -196,7 +231,12 @@ static const u16 spm_reg_offset_v1_1[SPM_REG_NR] = {
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[SPM_REG_SEQ_ENTRY] = 0x80,
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};
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static void smp_set_vdd_v1_1(void *data);
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/* SPM register data for 8064 */
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static struct linear_range spm_v1_1_regulator_range =
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REGULATOR_LINEAR_RANGE(700000, 0, 56, 12500);
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static const struct spm_reg_data spm_reg_8064_cpu = {
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.reg_offset = spm_reg_offset_v1_1,
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.spm_cfg = 0x1F,
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@ -207,6 +247,10 @@ static const struct spm_reg_data spm_reg_8064_cpu = {
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0x10, 0x54, 0x30, 0x0C, 0x24, 0x30, 0x0F },
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.start_index[PM_SLEEP_MODE_STBY] = 0,
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.start_index[PM_SLEEP_MODE_SPC] = 2,
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.set_vdd = smp_set_vdd_v1_1,
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.range = &spm_v1_1_regulator_range,
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.init_uV = 1300000,
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.ramp_delay = 1250,
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};
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static inline void spm_register_write(struct spm_driver_data *drv,
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@ -258,6 +302,185 @@ void spm_set_low_power_mode(struct spm_driver_data *drv,
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spm_register_write_sync(drv, SPM_REG_SPM_CTL, ctl_val);
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}
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static int spm_set_voltage_sel(struct regulator_dev *rdev, unsigned int selector)
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{
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struct spm_driver_data *drv = rdev_get_drvdata(rdev);
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drv->volt_sel = selector;
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/* Always do the SAW register writes on the corresponding CPU */
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return smp_call_function_single(drv->reg_cpu, drv->reg_data->set_vdd, drv, true);
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}
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static int spm_get_voltage_sel(struct regulator_dev *rdev)
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{
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struct spm_driver_data *drv = rdev_get_drvdata(rdev);
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return drv->volt_sel;
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}
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static const struct regulator_ops spm_reg_ops = {
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.set_voltage_sel = spm_set_voltage_sel,
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.get_voltage_sel = spm_get_voltage_sel,
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.list_voltage = regulator_list_voltage_linear_range,
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.set_voltage_time_sel = regulator_set_voltage_time_sel,
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};
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static void smp_set_vdd_v1_1(void *data)
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{
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struct spm_driver_data *drv = data;
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unsigned int vctl, data0, data1, avs_ctl, sts;
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unsigned int vlevel, volt_sel;
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bool avs_enabled;
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volt_sel = drv->volt_sel;
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vlevel = volt_sel | 0x80; /* band */
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avs_ctl = spm_register_read(drv, SPM_REG_AVS_CTL);
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vctl = spm_register_read(drv, SPM_REG_VCTL);
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data0 = spm_register_read(drv, SPM_REG_PMIC_DATA_0);
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data1 = spm_register_read(drv, SPM_REG_PMIC_DATA_1);
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avs_enabled = avs_ctl & SPM_1_1_AVS_CTL_AVS_ENABLED;
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/* If AVS is enabled, switch it off during the voltage change */
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if (avs_enabled) {
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avs_ctl &= ~SPM_1_1_AVS_CTL_AVS_ENABLED;
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spm_register_write(drv, SPM_REG_AVS_CTL, avs_ctl);
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}
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/* Kick the state machine back to idle */
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spm_register_write(drv, SPM_REG_RST, 1);
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vctl = FIELD_SET(vctl, SPM_VCTL_VLVL, vlevel);
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data0 = FIELD_SET(data0, SPM_PMIC_DATA_0_VLVL, vlevel);
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data1 = FIELD_SET(data1, SPM_PMIC_DATA_1_MIN_VSEL, volt_sel);
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data1 = FIELD_SET(data1, SPM_PMIC_DATA_1_MAX_VSEL, volt_sel);
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spm_register_write(drv, SPM_REG_VCTL, vctl);
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spm_register_write(drv, SPM_REG_PMIC_DATA_0, data0);
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spm_register_write(drv, SPM_REG_PMIC_DATA_1, data1);
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if (read_poll_timeout_atomic(spm_register_read,
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sts, sts == vlevel,
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1, 200, false,
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drv, SPM_REG_STS1)) {
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dev_err_ratelimited(drv->dev, "timeout setting the voltage (%x %x)!\n", sts, vlevel);
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goto enable_avs;
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}
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if (avs_enabled) {
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unsigned int max_avs = volt_sel;
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unsigned int min_avs = max(max_avs, 4U) - 4;
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avs_ctl = FIELD_SET(avs_ctl, SPM_AVS_CTL_MIN_VLVL, min_avs);
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avs_ctl = FIELD_SET(avs_ctl, SPM_AVS_CTL_MAX_VLVL, max_avs);
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spm_register_write(drv, SPM_REG_AVS_CTL, avs_ctl);
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}
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enable_avs:
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if (avs_enabled) {
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avs_ctl |= SPM_1_1_AVS_CTL_AVS_ENABLED;
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spm_register_write(drv, SPM_REG_AVS_CTL, avs_ctl);
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}
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}
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static int spm_get_cpu(struct device *dev)
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{
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int cpu;
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bool found;
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for_each_possible_cpu(cpu) {
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struct device_node *cpu_node, *saw_node;
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cpu_node = of_cpu_device_node_get(cpu);
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if (!cpu_node)
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continue;
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saw_node = of_parse_phandle(cpu_node, "qcom,saw", 0);
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found = (saw_node == dev->of_node);
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of_node_put(saw_node);
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of_node_put(cpu_node);
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if (found)
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return cpu;
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}
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/* L2 SPM is not bound to any CPU, voltage setting is not supported */
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return -EOPNOTSUPP;
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}
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#ifdef CONFIG_REGULATOR
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static int spm_register_regulator(struct device *dev, struct spm_driver_data *drv)
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{
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struct regulator_config config = {
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.dev = dev,
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.driver_data = drv,
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};
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struct regulator_desc *rdesc;
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struct regulator_dev *rdev;
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int ret;
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bool found;
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if (!drv->reg_data->set_vdd)
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return 0;
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rdesc = devm_kzalloc(dev, sizeof(*rdesc), GFP_KERNEL);
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if (!rdesc)
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return -ENOMEM;
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rdesc->name = "spm";
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rdesc->of_match = of_match_ptr("regulator");
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rdesc->type = REGULATOR_VOLTAGE;
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rdesc->owner = THIS_MODULE;
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rdesc->ops = &spm_reg_ops;
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rdesc->linear_ranges = drv->reg_data->range;
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rdesc->n_linear_ranges = 1;
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rdesc->n_voltages = rdesc->linear_ranges[rdesc->n_linear_ranges - 1].max_sel + 1;
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rdesc->ramp_delay = drv->reg_data->ramp_delay;
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ret = spm_get_cpu(dev);
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if (ret < 0)
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return ret;
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drv->reg_cpu = ret;
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dev_dbg(dev, "SAW2 bound to CPU %d\n", drv->reg_cpu);
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/*
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* Program initial voltage, otherwise registration will also try
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* setting the voltage, which might result in undervolting the CPU.
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*/
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drv->volt_sel = DIV_ROUND_UP(drv->reg_data->init_uV - rdesc->min_uV,
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rdesc->uV_step);
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ret = linear_range_get_selector_high(drv->reg_data->range,
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drv->reg_data->init_uV,
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&drv->volt_sel,
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&found);
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if (ret) {
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dev_err(dev, "Initial uV value out of bounds\n");
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return ret;
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}
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/* Always do the SAW register writes on the corresponding CPU */
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smp_call_function_single(drv->reg_cpu, drv->reg_data->set_vdd, drv, true);
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rdev = devm_regulator_register(dev, rdesc, &config);
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if (IS_ERR(rdev)) {
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dev_err(dev, "failed to register regulator\n");
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return PTR_ERR(rdev);
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}
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return 0;
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}
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#else
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static int spm_register_regulator(struct device *dev, struct spm_driver_data *drv)
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{
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return 0;
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}
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#endif
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static const struct of_device_id spm_match_table[] = {
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{ .compatible = "qcom,sdm660-gold-saw2-v4.1-l2",
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.data = &spm_reg_660_gold_l2 },
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@ -308,6 +531,7 @@ static int spm_dev_probe(struct platform_device *pdev)
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return -ENODEV;
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drv->reg_data = match_id->data;
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drv->dev = &pdev->dev;
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platform_set_drvdata(pdev, drv);
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/* Write the SPM sequences first.. */
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@ -335,7 +559,7 @@ static int spm_dev_probe(struct platform_device *pdev)
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if (drv->reg_data->reg_offset[SPM_REG_SPM_CTL])
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spm_set_low_power_mode(drv, PM_SLEEP_MODE_STBY);
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return 0;
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return spm_register_regulator(&pdev->dev, drv);
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}
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static struct platform_driver spm_driver = {
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