diff options
Diffstat (limited to 'drivers/soc/apple/apple-pmgr-pwrstate.c')
| -rw-r--r-- | drivers/soc/apple/apple-pmgr-pwrstate.c | 326 |
1 files changed, 0 insertions, 326 deletions
diff --git a/drivers/soc/apple/apple-pmgr-pwrstate.c b/drivers/soc/apple/apple-pmgr-pwrstate.c deleted file mode 100644 index d62a776c89a1..000000000000 --- a/drivers/soc/apple/apple-pmgr-pwrstate.c +++ /dev/null @@ -1,326 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only OR MIT -/* - * Apple SoC PMGR device power state driver - * - * Copyright The Asahi Linux Contributors - */ - -#include <linux/bitops.h> -#include <linux/bitfield.h> -#include <linux/err.h> -#include <linux/of.h> -#include <linux/of_address.h> -#include <linux/platform_device.h> -#include <linux/pm_domain.h> -#include <linux/regmap.h> -#include <linux/mfd/syscon.h> -#include <linux/reset-controller.h> -#include <linux/module.h> - -#define APPLE_PMGR_RESET BIT(31) -#define APPLE_PMGR_AUTO_ENABLE BIT(28) -#define APPLE_PMGR_PS_AUTO GENMASK(27, 24) -#define APPLE_PMGR_PS_MIN GENMASK(19, 16) -#define APPLE_PMGR_PARENT_OFF BIT(11) -#define APPLE_PMGR_DEV_DISABLE BIT(10) -#define APPLE_PMGR_WAS_CLKGATED BIT(9) -#define APPLE_PMGR_WAS_PWRGATED BIT(8) -#define APPLE_PMGR_PS_ACTUAL GENMASK(7, 4) -#define APPLE_PMGR_PS_TARGET GENMASK(3, 0) - -#define APPLE_PMGR_FLAGS (APPLE_PMGR_WAS_CLKGATED | APPLE_PMGR_WAS_PWRGATED) - -#define APPLE_PMGR_PS_ACTIVE 0xf -#define APPLE_PMGR_PS_CLKGATE 0x4 -#define APPLE_PMGR_PS_PWRGATE 0x0 - -#define APPLE_PMGR_PS_SET_TIMEOUT 100 -#define APPLE_PMGR_RESET_TIME 1 - -struct apple_pmgr_ps { - struct device *dev; - struct generic_pm_domain genpd; - struct reset_controller_dev rcdev; - struct regmap *regmap; - u32 offset; - u32 min_state; -}; - -#define genpd_to_apple_pmgr_ps(_genpd) container_of(_genpd, struct apple_pmgr_ps, genpd) -#define rcdev_to_apple_pmgr_ps(_rcdev) container_of(_rcdev, struct apple_pmgr_ps, rcdev) - -static int apple_pmgr_ps_set(struct generic_pm_domain *genpd, u32 pstate, bool auto_enable) -{ - int ret; - struct apple_pmgr_ps *ps = genpd_to_apple_pmgr_ps(genpd); - u32 reg; - - ret = regmap_read(ps->regmap, ps->offset, ®); - if (ret < 0) - return ret; - - /* Resets are synchronous, and only work if the device is powered and clocked. */ - if (reg & APPLE_PMGR_RESET && pstate != APPLE_PMGR_PS_ACTIVE) - dev_err(ps->dev, "PS %s: powering off with RESET active\n", - genpd->name); - - reg &= ~(APPLE_PMGR_AUTO_ENABLE | APPLE_PMGR_FLAGS | APPLE_PMGR_PS_TARGET); - reg |= FIELD_PREP(APPLE_PMGR_PS_TARGET, pstate); - - dev_dbg(ps->dev, "PS %s: pwrstate = 0x%x: 0x%x\n", genpd->name, pstate, reg); - - regmap_write(ps->regmap, ps->offset, reg); - - ret = regmap_read_poll_timeout_atomic( - ps->regmap, ps->offset, reg, - (FIELD_GET(APPLE_PMGR_PS_ACTUAL, reg) == pstate), 1, - APPLE_PMGR_PS_SET_TIMEOUT); - if (ret < 0) - dev_err(ps->dev, "PS %s: Failed to reach power state 0x%x (now: 0x%x)\n", - genpd->name, pstate, reg); - - if (auto_enable) { - /* Not all devices implement this; this is a no-op where not implemented. */ - reg &= ~APPLE_PMGR_FLAGS; - reg |= APPLE_PMGR_AUTO_ENABLE; - regmap_write(ps->regmap, ps->offset, reg); - } - - return ret; -} - -static bool apple_pmgr_ps_is_active(struct apple_pmgr_ps *ps) -{ - u32 reg = 0; - - regmap_read(ps->regmap, ps->offset, ®); - /* - * We consider domains as active if they are actually on, or if they have auto-PM - * enabled and the intended target is on. - */ - return (FIELD_GET(APPLE_PMGR_PS_ACTUAL, reg) == APPLE_PMGR_PS_ACTIVE || - (FIELD_GET(APPLE_PMGR_PS_TARGET, reg) == APPLE_PMGR_PS_ACTIVE && - reg & APPLE_PMGR_AUTO_ENABLE)); -} - -static int apple_pmgr_ps_power_on(struct generic_pm_domain *genpd) -{ - return apple_pmgr_ps_set(genpd, APPLE_PMGR_PS_ACTIVE, true); -} - -static int apple_pmgr_ps_power_off(struct generic_pm_domain *genpd) -{ - return apple_pmgr_ps_set(genpd, APPLE_PMGR_PS_PWRGATE, false); -} - -static int apple_pmgr_reset_assert(struct reset_controller_dev *rcdev, unsigned long id) -{ - struct apple_pmgr_ps *ps = rcdev_to_apple_pmgr_ps(rcdev); - unsigned long flags; - - spin_lock_irqsave(&ps->genpd.slock, flags); - - if (ps->genpd.status == GENPD_STATE_OFF) - dev_err(ps->dev, "PS 0x%x: asserting RESET while powered down\n", ps->offset); - - dev_dbg(ps->dev, "PS 0x%x: assert reset\n", ps->offset); - /* Quiesce device before asserting reset */ - regmap_update_bits(ps->regmap, ps->offset, APPLE_PMGR_FLAGS | APPLE_PMGR_DEV_DISABLE, - APPLE_PMGR_DEV_DISABLE); - regmap_update_bits(ps->regmap, ps->offset, APPLE_PMGR_FLAGS | APPLE_PMGR_RESET, - APPLE_PMGR_RESET); - - spin_unlock_irqrestore(&ps->genpd.slock, flags); - - return 0; -} - -static int apple_pmgr_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id) -{ - struct apple_pmgr_ps *ps = rcdev_to_apple_pmgr_ps(rcdev); - unsigned long flags; - - spin_lock_irqsave(&ps->genpd.slock, flags); - - dev_dbg(ps->dev, "PS 0x%x: deassert reset\n", ps->offset); - regmap_update_bits(ps->regmap, ps->offset, APPLE_PMGR_FLAGS | APPLE_PMGR_RESET, 0); - regmap_update_bits(ps->regmap, ps->offset, APPLE_PMGR_FLAGS | APPLE_PMGR_DEV_DISABLE, 0); - - if (ps->genpd.status == GENPD_STATE_OFF) - dev_err(ps->dev, "PS 0x%x: RESET was deasserted while powered down\n", ps->offset); - - spin_unlock_irqrestore(&ps->genpd.slock, flags); - - return 0; -} - -static int apple_pmgr_reset_reset(struct reset_controller_dev *rcdev, unsigned long id) -{ - int ret; - - ret = apple_pmgr_reset_assert(rcdev, id); - if (ret) - return ret; - - usleep_range(APPLE_PMGR_RESET_TIME, 2 * APPLE_PMGR_RESET_TIME); - - return apple_pmgr_reset_deassert(rcdev, id); -} - -static int apple_pmgr_reset_status(struct reset_controller_dev *rcdev, unsigned long id) -{ - struct apple_pmgr_ps *ps = rcdev_to_apple_pmgr_ps(rcdev); - u32 reg = 0; - - regmap_read(ps->regmap, ps->offset, ®); - - return !!(reg & APPLE_PMGR_RESET); -} - -const struct reset_control_ops apple_pmgr_reset_ops = { - .assert = apple_pmgr_reset_assert, - .deassert = apple_pmgr_reset_deassert, - .reset = apple_pmgr_reset_reset, - .status = apple_pmgr_reset_status, -}; - -static int apple_pmgr_reset_xlate(struct reset_controller_dev *rcdev, - const struct of_phandle_args *reset_spec) -{ - return 0; -} - -static int apple_pmgr_ps_probe(struct platform_device *pdev) -{ - struct device *dev = &pdev->dev; - struct device_node *node = dev->of_node; - struct apple_pmgr_ps *ps; - struct regmap *regmap; - struct of_phandle_iterator it; - int ret; - const char *name; - bool active; - - regmap = syscon_node_to_regmap(node->parent); - if (IS_ERR(regmap)) - return PTR_ERR(regmap); - - ps = devm_kzalloc(dev, sizeof(*ps), GFP_KERNEL); - if (!ps) - return -ENOMEM; - - ps->dev = dev; - ps->regmap = regmap; - - ret = of_property_read_string(node, "label", &name); - if (ret < 0) { - dev_err(dev, "missing label property\n"); - return ret; - } - - ret = of_property_read_u32(node, "reg", &ps->offset); - if (ret < 0) { - dev_err(dev, "missing reg property\n"); - return ret; - } - - ps->genpd.flags |= GENPD_FLAG_IRQ_SAFE; - ps->genpd.name = name; - ps->genpd.power_on = apple_pmgr_ps_power_on; - ps->genpd.power_off = apple_pmgr_ps_power_off; - - ret = of_property_read_u32(node, "apple,min-state", &ps->min_state); - if (ret == 0 && ps->min_state <= APPLE_PMGR_PS_ACTIVE) - regmap_update_bits(regmap, ps->offset, APPLE_PMGR_FLAGS | APPLE_PMGR_PS_MIN, - FIELD_PREP(APPLE_PMGR_PS_MIN, ps->min_state)); - - active = apple_pmgr_ps_is_active(ps); - if (of_property_read_bool(node, "apple,always-on")) { - ps->genpd.flags |= GENPD_FLAG_ALWAYS_ON; - if (!active) { - dev_warn(dev, "always-on domain %s is not on at boot\n", name); - /* Turn it on so pm_genpd_init does not fail */ - active = apple_pmgr_ps_power_on(&ps->genpd) == 0; - } - } - - /* Turn on auto-PM if the domain is already on */ - if (active) - regmap_update_bits(regmap, ps->offset, APPLE_PMGR_FLAGS | APPLE_PMGR_AUTO_ENABLE, - APPLE_PMGR_AUTO_ENABLE); - - ret = pm_genpd_init(&ps->genpd, NULL, !active); - if (ret < 0) { - dev_err(dev, "pm_genpd_init failed\n"); - return ret; - } - - ret = of_genpd_add_provider_simple(node, &ps->genpd); - if (ret < 0) { - dev_err(dev, "of_genpd_add_provider_simple failed\n"); - return ret; - } - - of_for_each_phandle(&it, ret, node, "power-domains", "#power-domain-cells", -1) { - struct of_phandle_args parent, child; - - parent.np = it.node; - parent.args_count = of_phandle_iterator_args(&it, parent.args, MAX_PHANDLE_ARGS); - child.np = node; - child.args_count = 0; - ret = of_genpd_add_subdomain(&parent, &child); - - if (ret == -EPROBE_DEFER) { - of_node_put(parent.np); - goto err_remove; - } else if (ret < 0) { - dev_err(dev, "failed to add to parent domain: %d (%s -> %s)\n", - ret, it.node->name, node->name); - of_node_put(parent.np); - goto err_remove; - } - } - - /* - * Do not participate in regular PM; parent power domains are handled via the - * genpd hierarchy. - */ - pm_genpd_remove_device(dev); - - ps->rcdev.owner = THIS_MODULE; - ps->rcdev.nr_resets = 1; - ps->rcdev.ops = &apple_pmgr_reset_ops; - ps->rcdev.of_node = dev->of_node; - ps->rcdev.of_reset_n_cells = 0; - ps->rcdev.of_xlate = apple_pmgr_reset_xlate; - - ret = devm_reset_controller_register(dev, &ps->rcdev); - if (ret < 0) - goto err_remove; - - return 0; -err_remove: - of_genpd_del_provider(node); - pm_genpd_remove(&ps->genpd); - return ret; -} - -static const struct of_device_id apple_pmgr_ps_of_match[] = { - { .compatible = "apple,pmgr-pwrstate" }, - {} -}; - -MODULE_DEVICE_TABLE(of, apple_pmgr_ps_of_match); - -static struct platform_driver apple_pmgr_ps_driver = { - .probe = apple_pmgr_ps_probe, - .driver = { - .name = "apple-pmgr-pwrstate", - .of_match_table = apple_pmgr_ps_of_match, - }, -}; - -MODULE_AUTHOR("Hector Martin <marcan@marcan.st>"); -MODULE_DESCRIPTION("PMGR power state driver for Apple SoCs"); - -module_platform_driver(apple_pmgr_ps_driver); |