mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-30 14:19:16 +00:00
Code Issues Releases Wiki Activity

cpuidle: qcom_spm: Detach state machine from main SPM handling

Browse source 
In commit a871be6b8e ("cpuidle: Convert Qualcomm SPM driver to a generic
CPUidle driver") the SPM driver has been converted to a
generic CPUidle driver: that was mainly made to simplify the
driver and that was a great accomplishment;
Though, at that time, this driver was only applicable to ARM 32-bit SoCs,
lacking logic about the handling of newer generation SAW.

In preparation for the enablement of SPM features on AArch64/ARM64,
split the cpuidle-qcom-spm driver in two: the CPUIdle related
state machine (currently used only on ARM SoCs) stays there, while
the SPM communication handling lands back in soc/qcom/spm.c and
also making sure to not discard the simplifications that were
introduced in the aforementioned commit.

Since now the "two drivers" are split, the SCM dependency in the
main SPM handling is gone and for this reason it was also possible
to move the SPM initialization early: this will also make sure that
whenever the SAW CPUIdle driver is getting initialized, the SPM
driver will be ready to do the job.

Please note that the anticipation of the SPM initialization was
also done to optimize the boot times on platforms that have their
CPU/L2 idle states managed by other means (such as PSCI), while
needing SAW initialization for other purposes, like AVS control.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Reviewed-by: Stephan Gerhold <stephan@gerhold.net>
Tested-by: Stephan Gerhold <stephan@gerhold.net>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210729155609.608159-2-angelogioacchino.delregno@somainline.org
This commit is contained in:
AngeloGioacchino Del Regno 2021-07-29 17:56:05 +02:00 committed by Bjorn Andersson
parent b03543067a
commit 60f3692b5f
6 changed files with 340 additions and 254 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
drivers/cpuidle/Kconfig.arm
View file

@ -112,6 +112,7 @@ config ARM_QCOM_SPM_CPUIDLE
select CPU_IDLE_MULTIPLE_DRIVERS
select DT_IDLE_STATES
select QCOM_SCM
select QCOM_SPM
help
Select this to enable cpuidle for Qualcomm processors.
The Subsystem Power Manager (SPM) controls low power modes for the

326
drivers/cpuidle/cpuidle-qcom-spm.c
View file

@ -18,158 +18,18 @@
#include <linux/cpuidle.h>
#include <linux/cpu_pm.h>
#include <linux/qcom_scm.h>
#include <soc/qcom/spm.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_qcom_spm_data {
struct cpuidle_driver cpuidle_driver;
void __iomem *reg_base;
const struct spm_reg_data *reg_data;
struct spm_driver_data *spm;
};
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,
};
/* 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 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);
@ -201,10 +61,10 @@ static int qcom_cpu_spc(struct spm_driver_data *drv)
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);
struct cpuidle_qcom_spm_data *data = container_of(drv, struct cpuidle_qcom_spm_data,
cpuidle_driver);
return CPU_PM_CPU_IDLE_ENTER_PARAM(qcom_cpu_spc, idx, data);
return CPU_PM_CPU_IDLE_ENTER_PARAM(qcom_cpu_spc, idx, data->spm);
}
static struct cpuidle_driver qcom_spm_idle_driver = {
@ -225,134 +85,92 @@ static const struct of_device_id qcom_idle_state_match[] = {
{ },
};
static int spm_cpuidle_init(struct cpuidle_driver *drv, int cpu)
static int spm_cpuidle_register(struct device *cpuidle_dev, int cpu)
{
struct platform_device *pdev = NULL;
struct device_node *cpu_node, *saw_node;
struct cpuidle_qcom_spm_data *data = NULL;
int ret;
memcpy(drv, &qcom_spm_idle_driver, sizeof(*drv));
drv->cpumask = (struct cpumask *)cpumask_of(cpu);
cpu_node = of_cpu_device_node_get(cpu);
if (!cpu_node)
return -ENODEV;
/* Parse idle states from device tree */
ret = dt_init_idle_driver(drv, qcom_idle_state_match, 1);
saw_node = of_parse_phandle(cpu_node, "qcom,saw", 0);
if (!saw_node)
return -ENODEV;
pdev = of_find_device_by_node(saw_node);
of_node_put(saw_node);
of_node_put(cpu_node);
if (!pdev)
return -ENODEV;
data = devm_kzalloc(cpuidle_dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->spm = dev_get_drvdata(&pdev->dev);
if (!data->spm)
return -EINVAL;
data->cpuidle_driver = qcom_spm_idle_driver;
data->cpuidle_driver.cpumask = (struct cpumask *)cpumask_of(cpu);
ret = dt_init_idle_driver(&data->cpuidle_driver,
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);
ret = qcom_scm_set_warm_boot_addr(cpu_resume_arm, cpumask_of(cpu));
if (ret)
return ret;
return cpuidle_register(&data->cpuidle_driver, NULL);
}
static struct spm_driver_data *spm_get_drv(struct platform_device *pdev,
int *spm_cpu)
static int spm_cpuidle_drv_probe(struct platform_device *pdev)
{
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,msm8226-saw2-v2.1-cpu",
.data = &spm_reg_8226_cpu },
{ .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);
for_each_possible_cpu(cpu) {
ret = spm_cpuidle_register(&pdev->dev, cpu);
if (ret && ret != -ENODEV) {
dev_err(&pdev->dev,
"Cannot register for CPU%d: %d\n", cpu, ret);
}
}
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,
static struct platform_driver spm_cpuidle_driver = {
.probe = spm_cpuidle_drv_probe,
.driver = {
.name = "saw",
.of_match_table = spm_match_table,
.name = "qcom-spm-cpuidle",
.suppress_bind_attrs = true,
},
};
builtin_platform_driver(spm_driver);
static int __init qcom_spm_cpuidle_init(void)
{
struct platform_device *pdev;
int ret;
ret = platform_driver_register(&spm_cpuidle_driver);
if (ret)
return ret;
pdev = platform_device_register_simple("qcom-spm-cpuidle",
-1, NULL, 0);
if (IS_ERR(pdev)) {
platform_driver_unregister(&spm_cpuidle_driver);
return PTR_ERR(pdev);
}
return 0;
}
device_initcall(qcom_spm_cpuidle_init);

9
drivers/soc/qcom/Kconfig
View file

@ -190,6 +190,15 @@ config QCOM_SOCINFO
Say yes here to support the Qualcomm socinfo driver, providing
information about the SoC to user space.
config QCOM_SPM
tristate "Qualcomm Subsystem Power Manager (SPM)"
depends on ARCH_QCOM
select QCOM_SCM
help
Enable the support for the Qualcomm Subsystem Power Manager, used
to manage cores, L2 low power modes and to configure the internal
Adaptive Voltage Scaler parameters, where supported.
config QCOM_WCNSS_CTRL
tristate "Qualcomm WCNSS control driver"
depends on ARCH_QCOM || COMPILE_TEST

1
drivers/soc/qcom/Makefile
View file

@ -20,6 +20,7 @@ obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o
obj-$(CONFIG_QCOM_SMP2P) += smp2p.o
obj-$(CONFIG_QCOM_SMSM) += smsm.o
obj-$(CONFIG_QCOM_SOCINFO) += socinfo.o
obj-$(CONFIG_QCOM_SPM) += spm.o
obj-$(CONFIG_QCOM_WCNSS_CTRL) += wcnss_ctrl.o
obj-$(CONFIG_QCOM_APR) += apr.o
obj-$(CONFIG_QCOM_LLCC) += llcc-qcom.o

216
drivers/soc/qcom/spm.c Normal file
View file

@ -0,0 +1,216 @@
// 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_NR,
};
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,
};
/* 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 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]);
}
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,msm8226-saw2-v2.1-cpu",
.data = &spm_reg_8226_cpu },
{ .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 },
{ },
};
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_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 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");

41
include/soc/qcom/spm.h Normal file
View file

@ -0,0 +1,41 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2011-2014, The Linux Foundation. All rights reserved.
* Copyright (c) 2014,2015, Linaro Ltd.
*/
#ifndef __SPM_H__
#define __SPM_H__
#include <linux/cpuidle.h>
#define MAX_PMIC_DATA 2
#define MAX_SEQ_DATA 64
enum pm_sleep_mode {
PM_SLEEP_MODE_STBY,
PM_SLEEP_MODE_RET,
PM_SLEEP_MODE_SPC,
PM_SLEEP_MODE_PC,
PM_SLEEP_MODE_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 {
void __iomem *reg_base;
const struct spm_reg_data *reg_data;
};
void spm_set_low_power_mode(struct spm_driver_data *drv,
enum pm_sleep_mode mode);
#endif /* __SPM_H__ */