123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344 |
- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright (c) 2011-2014, The Linux Foundation. All rights reserved.
- * Copyright (c) 2014,2015, Linaro Ltd.
- *
- * SAW power controller driver
- */
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <linux/io.h>
- #include <linux/slab.h>
- #include <linux/of.h>
- #include <linux/of_address.h>
- #include <linux/of_device.h>
- #include <linux/err.h>
- #include <linux/platform_device.h>
- #include <linux/cpuidle.h>
- #include <linux/cpu_pm.h>
- #include <linux/qcom_scm.h>
- #include <asm/proc-fns.h>
- #include <asm/suspend.h>
- #include "dt_idle_states.h"
- #define MAX_PMIC_DATA 2
- #define MAX_SEQ_DATA 64
- #define SPM_CTL_INDEX 0x7f
- #define SPM_CTL_INDEX_SHIFT 4
- #define SPM_CTL_EN BIT(0)
- enum pm_sleep_mode {
- PM_SLEEP_MODE_STBY,
- PM_SLEEP_MODE_RET,
- PM_SLEEP_MODE_SPC,
- PM_SLEEP_MODE_PC,
- PM_SLEEP_MODE_NR,
- };
- enum spm_reg {
- SPM_REG_CFG,
- SPM_REG_SPM_CTL,
- SPM_REG_DLY,
- SPM_REG_PMIC_DLY,
- SPM_REG_PMIC_DATA_0,
- SPM_REG_PMIC_DATA_1,
- SPM_REG_VCTL,
- SPM_REG_SEQ_ENTRY,
- SPM_REG_SPM_STS,
- SPM_REG_PMIC_STS,
- SPM_REG_NR,
- };
- struct spm_reg_data {
- const u8 *reg_offset;
- u32 spm_cfg;
- u32 spm_dly;
- u32 pmic_dly;
- u32 pmic_data[MAX_PMIC_DATA];
- u8 seq[MAX_SEQ_DATA];
- u8 start_index[PM_SLEEP_MODE_NR];
- };
- struct spm_driver_data {
- struct cpuidle_driver cpuidle_driver;
- void __iomem *reg_base;
- const struct spm_reg_data *reg_data;
- };
- static const u8 spm_reg_offset_v2_1[SPM_REG_NR] = {
- [SPM_REG_CFG] = 0x08,
- [SPM_REG_SPM_CTL] = 0x30,
- [SPM_REG_DLY] = 0x34,
- [SPM_REG_SEQ_ENTRY] = 0x80,
- };
- /* SPM register data for 8974, 8084 */
- static const struct spm_reg_data spm_reg_8974_8084_cpu = {
- .reg_offset = spm_reg_offset_v2_1,
- .spm_cfg = 0x1,
- .spm_dly = 0x3C102800,
- .seq = { 0x03, 0x0B, 0x0F, 0x00, 0x20, 0x80, 0x10, 0xE8, 0x5B, 0x03,
- 0x3B, 0xE8, 0x5B, 0x82, 0x10, 0x0B, 0x30, 0x06, 0x26, 0x30,
- 0x0F },
- .start_index[PM_SLEEP_MODE_STBY] = 0,
- .start_index[PM_SLEEP_MODE_SPC] = 3,
- };
- static const u8 spm_reg_offset_v1_1[SPM_REG_NR] = {
- [SPM_REG_CFG] = 0x08,
- [SPM_REG_SPM_CTL] = 0x20,
- [SPM_REG_PMIC_DLY] = 0x24,
- [SPM_REG_PMIC_DATA_0] = 0x28,
- [SPM_REG_PMIC_DATA_1] = 0x2C,
- [SPM_REG_SEQ_ENTRY] = 0x80,
- };
- /* SPM register data for 8064 */
- static const struct spm_reg_data spm_reg_8064_cpu = {
- .reg_offset = spm_reg_offset_v1_1,
- .spm_cfg = 0x1F,
- .pmic_dly = 0x02020004,
- .pmic_data[0] = 0x0084009C,
- .pmic_data[1] = 0x00A4001C,
- .seq = { 0x03, 0x0F, 0x00, 0x24, 0x54, 0x10, 0x09, 0x03, 0x01,
- 0x10, 0x54, 0x30, 0x0C, 0x24, 0x30, 0x0F },
- .start_index[PM_SLEEP_MODE_STBY] = 0,
- .start_index[PM_SLEEP_MODE_SPC] = 2,
- };
- static inline void spm_register_write(struct spm_driver_data *drv,
- enum spm_reg reg, u32 val)
- {
- if (drv->reg_data->reg_offset[reg])
- writel_relaxed(val, drv->reg_base +
- drv->reg_data->reg_offset[reg]);
- }
- /* Ensure a guaranteed write, before return */
- static inline void spm_register_write_sync(struct spm_driver_data *drv,
- enum spm_reg reg, u32 val)
- {
- u32 ret;
- if (!drv->reg_data->reg_offset[reg])
- return;
- do {
- writel_relaxed(val, drv->reg_base +
- drv->reg_data->reg_offset[reg]);
- ret = readl_relaxed(drv->reg_base +
- drv->reg_data->reg_offset[reg]);
- if (ret == val)
- break;
- cpu_relax();
- } while (1);
- }
- static inline u32 spm_register_read(struct spm_driver_data *drv,
- enum spm_reg reg)
- {
- return readl_relaxed(drv->reg_base + drv->reg_data->reg_offset[reg]);
- }
- static void spm_set_low_power_mode(struct spm_driver_data *drv,
- enum pm_sleep_mode mode)
- {
- u32 start_index;
- u32 ctl_val;
- start_index = drv->reg_data->start_index[mode];
- ctl_val = spm_register_read(drv, SPM_REG_SPM_CTL);
- ctl_val &= ~(SPM_CTL_INDEX << SPM_CTL_INDEX_SHIFT);
- ctl_val |= start_index << SPM_CTL_INDEX_SHIFT;
- ctl_val |= SPM_CTL_EN;
- spm_register_write_sync(drv, SPM_REG_SPM_CTL, ctl_val);
- }
- static int qcom_pm_collapse(unsigned long int unused)
- {
- qcom_scm_cpu_power_down(QCOM_SCM_CPU_PWR_DOWN_L2_ON);
- /*
- * Returns here only if there was a pending interrupt and we did not
- * power down as a result.
- */
- return -1;
- }
- static int qcom_cpu_spc(struct spm_driver_data *drv)
- {
- int ret;
- spm_set_low_power_mode(drv, PM_SLEEP_MODE_SPC);
- ret = cpu_suspend(0, qcom_pm_collapse);
- /*
- * ARM common code executes WFI without calling into our driver and
- * if the SPM mode is not reset, then we may accidently power down the
- * cpu when we intended only to gate the cpu clock.
- * Ensure the state is set to standby before returning.
- */
- spm_set_low_power_mode(drv, PM_SLEEP_MODE_STBY);
- return ret;
- }
- static int spm_enter_idle_state(struct cpuidle_device *dev,
- struct cpuidle_driver *drv, int idx)
- {
- struct spm_driver_data *data = container_of(drv, struct spm_driver_data,
- cpuidle_driver);
- return CPU_PM_CPU_IDLE_ENTER_PARAM(qcom_cpu_spc, idx, data);
- }
- static struct cpuidle_driver qcom_spm_idle_driver = {
- .name = "qcom_spm",
- .owner = THIS_MODULE,
- .states[0] = {
- .enter = spm_enter_idle_state,
- .exit_latency = 1,
- .target_residency = 1,
- .power_usage = UINT_MAX,
- .name = "WFI",
- .desc = "ARM WFI",
- }
- };
- static const struct of_device_id qcom_idle_state_match[] = {
- { .compatible = "qcom,idle-state-spc", .data = spm_enter_idle_state },
- { },
- };
- static int spm_cpuidle_init(struct cpuidle_driver *drv, int cpu)
- {
- int ret;
- memcpy(drv, &qcom_spm_idle_driver, sizeof(*drv));
- drv->cpumask = (struct cpumask *)cpumask_of(cpu);
- /* Parse idle states from device tree */
- ret = dt_init_idle_driver(drv, qcom_idle_state_match, 1);
- if (ret <= 0)
- return ret ? : -ENODEV;
- /* We have atleast one power down mode */
- return qcom_scm_set_warm_boot_addr(cpu_resume_arm, drv->cpumask);
- }
- static struct spm_driver_data *spm_get_drv(struct platform_device *pdev,
- int *spm_cpu)
- {
- struct spm_driver_data *drv = NULL;
- struct device_node *cpu_node, *saw_node;
- int cpu;
- bool found = 0;
- for_each_possible_cpu(cpu) {
- cpu_node = of_cpu_device_node_get(cpu);
- if (!cpu_node)
- continue;
- saw_node = of_parse_phandle(cpu_node, "qcom,saw", 0);
- found = (saw_node == pdev->dev.of_node);
- of_node_put(saw_node);
- of_node_put(cpu_node);
- if (found)
- break;
- }
- if (found) {
- drv = devm_kzalloc(&pdev->dev, sizeof(*drv), GFP_KERNEL);
- if (drv)
- *spm_cpu = cpu;
- }
- return drv;
- }
- static const struct of_device_id spm_match_table[] = {
- { .compatible = "qcom,msm8974-saw2-v2.1-cpu",
- .data = &spm_reg_8974_8084_cpu },
- { .compatible = "qcom,apq8084-saw2-v2.1-cpu",
- .data = &spm_reg_8974_8084_cpu },
- { .compatible = "qcom,apq8064-saw2-v1.1-cpu",
- .data = &spm_reg_8064_cpu },
- { },
- };
- static int spm_dev_probe(struct platform_device *pdev)
- {
- struct spm_driver_data *drv;
- struct resource *res;
- const struct of_device_id *match_id;
- void __iomem *addr;
- int cpu, ret;
- if (!qcom_scm_is_available())
- return -EPROBE_DEFER;
- drv = spm_get_drv(pdev, &cpu);
- if (!drv)
- return -EINVAL;
- platform_set_drvdata(pdev, drv);
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- drv->reg_base = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(drv->reg_base))
- return PTR_ERR(drv->reg_base);
- match_id = of_match_node(spm_match_table, pdev->dev.of_node);
- if (!match_id)
- return -ENODEV;
- drv->reg_data = match_id->data;
- ret = spm_cpuidle_init(&drv->cpuidle_driver, cpu);
- if (ret)
- return ret;
- /* Write the SPM sequences first.. */
- addr = drv->reg_base + drv->reg_data->reg_offset[SPM_REG_SEQ_ENTRY];
- __iowrite32_copy(addr, drv->reg_data->seq,
- ARRAY_SIZE(drv->reg_data->seq) / 4);
- /*
- * ..and then the control registers.
- * On some SoC if the control registers are written first and if the
- * CPU was held in reset, the reset signal could trigger the SPM state
- * machine, before the sequences are completely written.
- */
- spm_register_write(drv, SPM_REG_CFG, drv->reg_data->spm_cfg);
- spm_register_write(drv, SPM_REG_DLY, drv->reg_data->spm_dly);
- spm_register_write(drv, SPM_REG_PMIC_DLY, drv->reg_data->pmic_dly);
- spm_register_write(drv, SPM_REG_PMIC_DATA_0,
- drv->reg_data->pmic_data[0]);
- spm_register_write(drv, SPM_REG_PMIC_DATA_1,
- drv->reg_data->pmic_data[1]);
- /* Set up Standby as the default low power mode */
- spm_set_low_power_mode(drv, PM_SLEEP_MODE_STBY);
- return cpuidle_register(&drv->cpuidle_driver, NULL);
- }
- static int spm_dev_remove(struct platform_device *pdev)
- {
- struct spm_driver_data *drv = platform_get_drvdata(pdev);
- cpuidle_unregister(&drv->cpuidle_driver);
- return 0;
- }
- static struct platform_driver spm_driver = {
- .probe = spm_dev_probe,
- .remove = spm_dev_remove,
- .driver = {
- .name = "saw",
- .of_match_table = spm_match_table,
- },
- };
- builtin_platform_driver(spm_driver);
|