#include <linux/auxiliary_bus.h>
#include <linux/container_of.h>
#include <linux/dev_printk.h>
#include <linux/device.h>
#include <linux/mfd/syscon.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/pm_domain.h>
#include <linux/regmap.h>
#include <dt-bindings/power/marvell,pxa1908-power.h>
#define APMU_PWR_CTRL_REG 0xd8
#define APMU_PWR_BLK_TMR_REG 0xdc
#define APMU_PWR_STATUS_REG 0xf0
#define APMU_DEBUG 0x88
#define DSI_PHY_DVM_MASK BIT(31)
#define POWER_ON_LATENCY_US 300
#define POWER_OFF_LATENCY_US 20
#define POWER_POLL_TIMEOUT_US (25 * USEC_PER_MSEC)
#define POWER_POLL_SLEEP_US 6
#define NR_DOMAINS 5
#define to_pxa1908_pd(_genpd) container_of(_genpd, struct pxa1908_pd, genpd)
struct pxa1908_pd_ctrl {
struct generic_pm_domain *domains[NR_DOMAINS];
struct genpd_onecell_data onecell_data;
struct regmap *base;
struct device *dev;
};
struct pxa1908_pd_data {
u32 reg_clk_res_ctrl;
u32 pwr_state;
u32 hw_mode;
bool keep_on;
int id;
};
struct pxa1908_pd {
const struct pxa1908_pd_data data;
struct pxa1908_pd_ctrl *ctrl;
struct generic_pm_domain genpd;
bool initialized;
};
static inline bool pxa1908_pd_is_on(struct pxa1908_pd *pd)
{
struct pxa1908_pd_ctrl *ctrl = pd->ctrl;
return pd->data.id != PXA1908_POWER_DOMAIN_DSI
? regmap_test_bits(ctrl->base, APMU_PWR_STATUS_REG, pd->data.pwr_state)
: regmap_test_bits(ctrl->base, APMU_DEBUG, DSI_PHY_DVM_MASK);
}
static int pxa1908_pd_power_on(struct generic_pm_domain *genpd)
{
struct pxa1908_pd *pd = to_pxa1908_pd(genpd);
const struct pxa1908_pd_data *data = &pd->data;
struct pxa1908_pd_ctrl *ctrl = pd->ctrl;
unsigned int status;
int ret = 0;
regmap_set_bits(ctrl->base, data->reg_clk_res_ctrl, data->hw_mode);
if (data->id != PXA1908_POWER_DOMAIN_ISP)
regmap_write(ctrl->base, APMU_PWR_BLK_TMR_REG, 0x20001fff);
regmap_set_bits(ctrl->base, APMU_PWR_CTRL_REG, data->pwr_state);
ret = regmap_read_poll_timeout(ctrl->base, APMU_PWR_STATUS_REG, status,
status & data->pwr_state, POWER_POLL_SLEEP_US,
POWER_ON_LATENCY_US + POWER_POLL_TIMEOUT_US);
if (ret == -ETIMEDOUT)
dev_err(ctrl->dev, "timed out powering on domain '%s'\n", pd->genpd.name);
return ret;
}
static int pxa1908_pd_power_off(struct generic_pm_domain *genpd)
{
struct pxa1908_pd *pd = to_pxa1908_pd(genpd);
const struct pxa1908_pd_data *data = &pd->data;
struct pxa1908_pd_ctrl *ctrl = pd->ctrl;
unsigned int status;
int ret;
regmap_clear_bits(ctrl->base, APMU_PWR_CTRL_REG, data->pwr_state);
ret = regmap_read_poll_timeout(ctrl->base, APMU_PWR_STATUS_REG, status,
!(status & data->pwr_state), POWER_POLL_SLEEP_US,
POWER_OFF_LATENCY_US + POWER_POLL_TIMEOUT_US);
if (ret == -ETIMEDOUT) {
dev_err(ctrl->dev, "timed out powering off domain '%s'\n", pd->genpd.name);
return ret;
}
return regmap_clear_bits(ctrl->base, data->reg_clk_res_ctrl, data->hw_mode);
}
static inline int pxa1908_dsi_power_on(struct generic_pm_domain *genpd)
{
struct pxa1908_pd *pd = to_pxa1908_pd(genpd);
struct pxa1908_pd_ctrl *ctrl = pd->ctrl;
return regmap_set_bits(ctrl->base, APMU_DEBUG, DSI_PHY_DVM_MASK);
}
static inline int pxa1908_dsi_power_off(struct generic_pm_domain *genpd)
{
struct pxa1908_pd *pd = to_pxa1908_pd(genpd);
struct pxa1908_pd_ctrl *ctrl = pd->ctrl;
return regmap_clear_bits(ctrl->base, APMU_DEBUG, DSI_PHY_DVM_MASK);
}
#define DOMAIN(_id, _name, ctrl, mode, state) \
[_id] = { \
.data = { \
.reg_clk_res_ctrl = ctrl, \
.hw_mode = BIT(mode), \
.pwr_state = BIT(state), \
.id = _id, \
}, \
.genpd = { \
.name = _name, \
.power_on = pxa1908_pd_power_on, \
.power_off = pxa1908_pd_power_off, \
}, \
}
static struct pxa1908_pd domains[NR_DOMAINS] = {
DOMAIN(PXA1908_POWER_DOMAIN_VPU, "vpu", 0xa4, 19, 2),
DOMAIN(PXA1908_POWER_DOMAIN_GPU, "gpu", 0xcc, 11, 0),
DOMAIN(PXA1908_POWER_DOMAIN_GPU2D, "gpu2d", 0xf4, 11, 6),
DOMAIN(PXA1908_POWER_DOMAIN_ISP, "isp", 0x38, 15, 4),
[PXA1908_POWER_DOMAIN_DSI] = {
.genpd = {
.name = "dsi",
.power_on = pxa1908_dsi_power_on,
.power_off = pxa1908_dsi_power_off,
.flags = GENPD_FLAG_ALWAYS_ON,
},
.data = {
.keep_on = true,
},
},
};
static void pxa1908_pd_remove(struct auxiliary_device *auxdev)
{
struct pxa1908_pd *pd;
int ret;
for (int i = NR_DOMAINS - 1; i >= 0; i--) {
pd = &domains[i];
if (!pd->initialized)
continue;
if (pxa1908_pd_is_on(pd) && !pd->data.keep_on)
pxa1908_pd_power_off(&pd->genpd);
ret = pm_genpd_remove(&pd->genpd);
if (ret)
dev_err(&auxdev->dev, "failed to remove domain '%s': %d\n",
pd->genpd.name, ret);
}
}
static int
pxa1908_pd_init(struct pxa1908_pd_ctrl *ctrl, int id, struct device *dev)
{
struct pxa1908_pd *pd = &domains[id];
int ret;
ctrl->domains[id] = &pd->genpd;
pd->ctrl = ctrl;
if (pd->data.keep_on) {
ret = pd->genpd.power_on(&pd->genpd);
if (ret)
return dev_err_probe(dev, ret, "failed to power on domain '%s'\n",
pd->genpd.name);
} else {
if (pxa1908_pd_is_on(pd)) {
dev_warn(dev,
"domain '%s' is on despite being default off; powering off\n",
pd->genpd.name);
ret = pd->genpd.power_off(&pd->genpd);
if (ret)
return dev_err_probe(dev, ret,
"failed to power off domain '%s'\n",
pd->genpd.name);
}
}
ret = pm_genpd_init(&pd->genpd, NULL, !pd->data.keep_on);
if (ret)
return dev_err_probe(dev, ret, "domain '%s' failed to initialize\n",
pd->genpd.name);
pd->initialized = true;
return 0;
}
static int
pxa1908_pd_probe(struct auxiliary_device *auxdev, const struct auxiliary_device_id *aux_id)
{
struct pxa1908_pd_ctrl *ctrl;
struct device *dev = &auxdev->dev;
int ret;
ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
if (!ctrl)
return -ENOMEM;
auxiliary_set_drvdata(auxdev, ctrl);
ctrl->base = syscon_node_to_regmap(dev->parent->of_node);
if (IS_ERR(ctrl->base))
return dev_err_probe(dev, PTR_ERR(ctrl->base), "no regmap available\n");
ctrl->dev = dev;
ctrl->onecell_data.domains = ctrl->domains;
ctrl->onecell_data.num_domains = NR_DOMAINS;
for (int i = 0; i < NR_DOMAINS; i++) {
ret = pxa1908_pd_init(ctrl, i, dev);
if (ret)
goto err;
}
return of_genpd_add_provider_onecell(dev->parent->of_node, &ctrl->onecell_data);
err:
pxa1908_pd_remove(auxdev);
return ret;
}
static const struct auxiliary_device_id pxa1908_pd_id[] = {
{ .name = "clk_pxa1908_apmu.power" },
{ }
};
MODULE_DEVICE_TABLE(auxiliary, pxa1908_pd_id);
static struct auxiliary_driver pxa1908_pd_driver = {
.probe = pxa1908_pd_probe,
.remove = pxa1908_pd_remove,
.id_table = pxa1908_pd_id,
};
module_auxiliary_driver(pxa1908_pd_driver);
MODULE_AUTHOR("Duje Mihanović <duje@dujemihanovic.xyz>");
MODULE_DESCRIPTION("Marvell PXA1908 power domain driver");
MODULE_LICENSE("GPL");
