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// 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/module.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 <soc/qcom/spm.h>
#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 8909 */
static const struct spm_reg_data spm_reg_8909_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, 0x76, 0x76, 0x0B, 0x94, 0x5B, 0x80,
0x10, 0x26, 0x30, 0x0F },
.start_index[PM_SLEEP_MODE_STBY] = 0,
.start_index[PM_SLEEP_MODE_SPC] = 5,
};
/* 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,msm8909-saw2-v3.0-cpu",
.data = &spm_reg_8909_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");
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