// 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 #include #include #include #include #include #include #include #include #include #include #define SPM_CTL_INDEX 0x7f #define SPM_CTL_INDEX_SHIFT 4 #define SPM_CTL_EN BIT(0) 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_AVS_CTL, SPM_REG_AVS_LIMIT, SPM_REG_NR, }; static const u16 spm_reg_offset_v4_1[SPM_REG_NR] = { [SPM_REG_AVS_CTL] = 0x904, [SPM_REG_AVS_LIMIT] = 0x908, }; static const struct spm_reg_data spm_reg_660_gold_l2 = { .reg_offset = spm_reg_offset_v4_1, .avs_ctl = 0x1010031, .avs_limit = 0x4580458, }; static const struct spm_reg_data spm_reg_660_silver_l2 = { .reg_offset = spm_reg_offset_v4_1, .avs_ctl = 0x101c031, .avs_limit = 0x4580458, }; static const struct spm_reg_data spm_reg_8998_gold_l2 = { .reg_offset = spm_reg_offset_v4_1, .avs_ctl = 0x1010031, .avs_limit = 0x4700470, }; static const struct spm_reg_data spm_reg_8998_silver_l2 = { .reg_offset = spm_reg_offset_v4_1, .avs_ctl = 0x1010031, .avs_limit = 0x4200420, }; static const u16 spm_reg_offset_v3_0[SPM_REG_NR] = { [SPM_REG_CFG] = 0x08, [SPM_REG_SPM_CTL] = 0x30, [SPM_REG_DLY] = 0x34, [SPM_REG_SEQ_ENTRY] = 0x400, }; /* SPM register data for 8916 */ static const struct spm_reg_data spm_reg_8916_cpu = { .reg_offset = spm_reg_offset_v3_0, .spm_cfg = 0x1, .spm_dly = 0x3C102800, .seq = { 0x60, 0x03, 0x60, 0x0B, 0x0F, 0x20, 0x10, 0x80, 0x30, 0x90, 0x5B, 0x60, 0x03, 0x60, 0x3B, 0x76, 0x76, 0x0B, 0x94, 0x5B, 0x80, 0x10, 0x26, 0x30, 0x0F }, .start_index[PM_SLEEP_MODE_STBY] = 0, .start_index[PM_SLEEP_MODE_SPC] = 5, }; static const u16 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, }; /* SPM register data for 8226 */ static const struct spm_reg_data spm_reg_8226_cpu = { .reg_offset = spm_reg_offset_v2_1, .spm_cfg = 0x0, .spm_dly = 0x3C102800, .seq = { 0x60, 0x03, 0x60, 0x0B, 0x0F, 0x20, 0x10, 0x80, 0x30, 0x90, 0x5B, 0x60, 0x03, 0x60, 0x3B, 0x76, 0x76, 0x0B, 0x94, 0x5B, 0x80, 0x10, 0x26, 0x30, 0x0F }, .start_index[PM_SLEEP_MODE_STBY] = 0, .start_index[PM_SLEEP_MODE_SPC] = 5, }; static const u16 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]); } 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 const struct of_device_id spm_match_table[] = { { .compatible = "qcom,sdm660-gold-saw2-v4.1-l2", .data = &spm_reg_660_gold_l2 }, { .compatible = "qcom,sdm660-silver-saw2-v4.1-l2", .data = &spm_reg_660_silver_l2 }, { .compatible = "qcom,msm8226-saw2-v2.1-cpu", .data = &spm_reg_8226_cpu }, { .compatible = "qcom,msm8916-saw2-v3.0-cpu", .data = &spm_reg_8916_cpu }, { .compatible = "qcom,msm8974-saw2-v2.1-cpu", .data = &spm_reg_8974_8084_cpu }, { .compatible = "qcom,msm8998-gold-saw2-v4.1-l2", .data = &spm_reg_8998_gold_l2 }, { .compatible = "qcom,msm8998-silver-saw2-v4.1-l2", .data = &spm_reg_8998_silver_l2 }, { .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 }, { }, }; MODULE_DEVICE_TABLE(of, spm_match_table); static int spm_dev_probe(struct platform_device *pdev) { const struct of_device_id *match_id; struct spm_driver_data *drv; struct resource *res; void __iomem *addr; drv = devm_kzalloc(&pdev->dev, sizeof(*drv), GFP_KERNEL); if (!drv) return -ENOMEM; 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; platform_set_drvdata(pdev, drv); /* 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_AVS_CTL, drv->reg_data->avs_ctl); spm_register_write(drv, SPM_REG_AVS_LIMIT, drv->reg_data->avs_limit); 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 */ if (drv->reg_data->reg_offset[SPM_REG_SPM_CTL]) spm_set_low_power_mode(drv, PM_SLEEP_MODE_STBY); return 0; } static struct platform_driver spm_driver = { .probe = spm_dev_probe, .driver = { .name = "qcom_spm", .of_match_table = spm_match_table, }, }; static int __init qcom_spm_init(void) { return platform_driver_register(&spm_driver); } arch_initcall(qcom_spm_init); MODULE_LICENSE("GPL v2");