diff options
Diffstat (limited to 'drivers/soc')
| -rw-r--r-- | drivers/soc/tegra/pmc.c | 485 |
1 files changed, 424 insertions, 61 deletions
diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c index 08966c26d65c..bb173456bbff 100644 --- a/drivers/soc/tegra/pmc.c +++ b/drivers/soc/tegra/pmc.c @@ -31,10 +31,13 @@ #include <linux/iopoll.h> #include <linux/of.h> #include <linux/of_address.h> +#include <linux/of_platform.h> #include <linux/platform_device.h> +#include <linux/pm_domain.h> #include <linux/reboot.h> #include <linux/reset.h> #include <linux/seq_file.h> +#include <linux/slab.h> #include <linux/spinlock.h> #include <soc/tegra/common.h> @@ -102,6 +105,16 @@ #define GPU_RG_CNTRL 0x2d4 +struct tegra_powergate { + struct generic_pm_domain genpd; + struct tegra_pmc *pmc; + unsigned int id; + struct clk **clks; + unsigned int num_clks; + struct reset_control **resets; + unsigned int num_resets; +}; + struct tegra_pmc_soc { unsigned int num_powergates; const char *const *powergates; @@ -132,6 +145,7 @@ struct tegra_pmc_soc { * @cpu_pwr_good_en: CPU power good signal is enabled * @lp0_vec_phys: physical base address of the LP0 warm boot code * @lp0_vec_size: size of the LP0 warm boot code + * @powergates_available: Bitmap of available power gates * @powergates_lock: mutex for power gate register access */ struct tegra_pmc { @@ -156,6 +170,7 @@ struct tegra_pmc { bool cpu_pwr_good_en; u32 lp0_vec_phys; u32 lp0_vec_size; + DECLARE_BITMAP(powergates_available, TEGRA_POWERGATE_MAX); struct mutex powergates_lock; }; @@ -165,6 +180,12 @@ static struct tegra_pmc *pmc = &(struct tegra_pmc) { .suspend_mode = TEGRA_SUSPEND_NONE, }; +static inline struct tegra_powergate * +to_powergate(struct generic_pm_domain *domain) +{ + return container_of(domain, struct tegra_powergate, genpd); +} + static u32 tegra_pmc_readl(unsigned long offset) { return readl(pmc->base + offset); @@ -188,6 +209,31 @@ static inline bool tegra_powergate_is_valid(int id) return (pmc->soc && pmc->soc->powergates[id]); } +static inline bool tegra_powergate_is_available(int id) +{ + return test_bit(id, pmc->powergates_available); +} + +static int tegra_powergate_lookup(struct tegra_pmc *pmc, const char *name) +{ + unsigned int i; + + if (!pmc || !pmc->soc || !name) + return -EINVAL; + + for (i = 0; i < pmc->soc->num_powergates; i++) { + if (!tegra_powergate_is_valid(i)) + continue; + + if (!strcmp(name, pmc->soc->powergates[i])) + return i; + } + + dev_err(pmc->dev, "powergate %s not found\n", name); + + return -ENODEV; +} + /** * tegra_powergate_set() - set the state of a partition * @id: partition ID @@ -218,13 +264,219 @@ static int tegra_powergate_set(unsigned int id, bool new_state) return err; } +static int __tegra_powergate_remove_clamping(unsigned int id) +{ + u32 mask; + + mutex_lock(&pmc->powergates_lock); + + /* + * On Tegra124 and later, the clamps for the GPU are controlled by a + * separate register (with different semantics). + */ + if (id == TEGRA_POWERGATE_3D) { + if (pmc->soc->has_gpu_clamps) { + tegra_pmc_writel(0, GPU_RG_CNTRL); + goto out; + } + } + + /* + * Tegra 2 has a bug where PCIE and VDE clamping masks are + * swapped relatively to the partition ids + */ + if (id == TEGRA_POWERGATE_VDEC) + mask = (1 << TEGRA_POWERGATE_PCIE); + else if (id == TEGRA_POWERGATE_PCIE) + mask = (1 << TEGRA_POWERGATE_VDEC); + else + mask = (1 << id); + + tegra_pmc_writel(mask, REMOVE_CLAMPING); + +out: + mutex_unlock(&pmc->powergates_lock); + + return 0; +} + +static void tegra_powergate_disable_clocks(struct tegra_powergate *pg) +{ + unsigned int i; + + for (i = 0; i < pg->num_clks; i++) + clk_disable_unprepare(pg->clks[i]); +} + +static int tegra_powergate_enable_clocks(struct tegra_powergate *pg) +{ + unsigned int i; + int err; + + for (i = 0; i < pg->num_clks; i++) { + err = clk_prepare_enable(pg->clks[i]); + if (err) + goto out; + } + + return 0; + +out: + while (i--) + clk_disable_unprepare(pg->clks[i]); + + return err; +} + +static int tegra_powergate_reset_assert(struct tegra_powergate *pg) +{ + unsigned int i; + int err; + + for (i = 0; i < pg->num_resets; i++) { + err = reset_control_assert(pg->resets[i]); + if (err) + return err; + } + + return 0; +} + +static int tegra_powergate_reset_deassert(struct tegra_powergate *pg) +{ + unsigned int i; + int err; + + for (i = 0; i < pg->num_resets; i++) { + err = reset_control_deassert(pg->resets[i]); + if (err) + return err; + } + + return 0; +} + +static int tegra_powergate_power_up(struct tegra_powergate *pg, + bool disable_clocks) +{ + int err; + + err = tegra_powergate_reset_assert(pg); + if (err) + return err; + + usleep_range(10, 20); + + err = tegra_powergate_set(pg->id, true); + if (err < 0) + return err; + + usleep_range(10, 20); + + err = tegra_powergate_enable_clocks(pg); + if (err) + goto disable_clks; + + usleep_range(10, 20); + + err = __tegra_powergate_remove_clamping(pg->id); + if (err) + goto disable_clks; + + usleep_range(10, 20); + + err = tegra_powergate_reset_deassert(pg); + if (err) + goto powergate_off; + + usleep_range(10, 20); + + if (disable_clocks) + tegra_powergate_disable_clocks(pg); + + return 0; + +disable_clks: + tegra_powergate_disable_clocks(pg); + usleep_range(10, 20); +powergate_off: + tegra_powergate_set(pg->id, false); + + return err; +} + +static int tegra_powergate_power_down(struct tegra_powergate *pg) +{ + int err; + + err = tegra_powergate_enable_clocks(pg); + if (err) + return err; + + usleep_range(10, 20); + + err = tegra_powergate_reset_assert(pg); + if (err) + goto disable_clks; + + usleep_range(10, 20); + + tegra_powergate_disable_clocks(pg); + + usleep_range(10, 20); + + err = tegra_powergate_set(pg->id, false); + if (err) + goto assert_resets; + + return 0; + +assert_resets: + tegra_powergate_enable_clocks(pg); + usleep_range(10, 20); + tegra_powergate_reset_deassert(pg); + usleep_range(10, 20); +disable_clks: + tegra_powergate_disable_clocks(pg); + + return err; +} + +static int tegra_genpd_power_on(struct generic_pm_domain *domain) +{ + struct tegra_powergate *pg = to_powergate(domain); + struct tegra_pmc *pmc = pg->pmc; + int err; + + err = tegra_powergate_power_up(pg, true); + if (err) + dev_err(pmc->dev, "failed to turn on PM domain %s: %d\n", + pg->genpd.name, err); + + return err; +} + +static int tegra_genpd_power_off(struct generic_pm_domain *domain) +{ + struct tegra_powergate *pg = to_powergate(domain); + struct tegra_pmc *pmc = pg->pmc; + int err; + + err = tegra_powergate_power_down(pg); + if (err) + dev_err(pmc->dev, "failed to turn off PM domain %s: %d\n", + pg->genpd.name, err); + + return err; +} + /** * tegra_powergate_power_on() - power on partition * @id: partition ID */ int tegra_powergate_power_on(unsigned int id) { - if (!tegra_powergate_is_valid(id)) + if (!tegra_powergate_is_available(id)) return -EINVAL; return tegra_powergate_set(id, true); @@ -236,7 +488,7 @@ int tegra_powergate_power_on(unsigned int id) */ int tegra_powergate_power_off(unsigned int id) { - if (!tegra_powergate_is_valid(id)) + if (!tegra_powergate_is_available(id)) return -EINVAL; return tegra_powergate_set(id, false); @@ -267,41 +519,10 @@ int tegra_powergate_is_powered(unsigned int id) */ int tegra_powergate_remove_clamping(unsigned int id) { - u32 mask; - - if (!tegra_powergate_is_valid(id)) + if (!tegra_powergate_is_available(id)) return -EINVAL; - mutex_lock(&pmc->powergates_lock); - - /* - * On Tegra124 and later, the clamps for the GPU are controlled by a - * separate register (with different semantics). - */ - if (id == TEGRA_POWERGATE_3D) { - if (pmc->soc->has_gpu_clamps) { - tegra_pmc_writel(0, GPU_RG_CNTRL); - goto out; - } - } - - /* - * Tegra 2 has a bug where PCIE and VDE clamping masks are - * swapped relatively to the partition ids - */ - if (id == TEGRA_POWERGATE_VDEC) - mask = (1 << TEGRA_POWERGATE_PCIE); - else if (id == TEGRA_POWERGATE_PCIE) - mask = (1 << TEGRA_POWERGATE_VDEC); - else - mask = (1 << id); - - tegra_pmc_writel(mask, REMOVE_CLAMPING); - -out: - mutex_unlock(&pmc->powergates_lock); - - return 0; + return __tegra_powergate_remove_clamping(id); } EXPORT_SYMBOL(tegra_powergate_remove_clamping); @@ -316,35 +537,20 @@ EXPORT_SYMBOL(tegra_powergate_remove_clamping); int tegra_powergate_sequence_power_up(unsigned int id, struct clk *clk, struct reset_control *rst) { - int ret; - - reset_control_assert(rst); - - ret = tegra_powergate_power_on(id); - if (ret) - goto err_power; - - ret = clk_prepare_enable(clk); - if (ret) - goto err_clk; - - usleep_range(10, 20); + struct tegra_powergate pg; + int err; - ret = tegra_powergate_remove_clamping(id); - if (ret) - goto err_clamp; + pg.id = id; + pg.clks = &clk; + pg.num_clks = 1; + pg.resets = &rst; + pg.num_resets = 1; - usleep_range(10, 20); - reset_control_deassert(rst); - - return 0; + err = tegra_powergate_power_up(&pg, false); + if (err) + pr_err("failed to turn on partition %d: %d\n", id, err); -err_clamp: - clk_disable_unprepare(clk); -err_clk: - tegra_powergate_power_off(id); -err_power: - return ret; + return err; } EXPORT_SYMBOL(tegra_powergate_sequence_power_up); @@ -486,6 +692,155 @@ static int tegra_powergate_debugfs_init(void) return 0; } +static int tegra_powergate_of_get_clks(struct tegra_powergate *pg, + struct device_node *np) +{ + struct clk *clk; + unsigned int i, count; + int err; + + count = of_count_phandle_with_args(np, "clocks", "#clock-cells"); + if (count == 0) + return -ENODEV; + + pg->clks = kcalloc(count, sizeof(clk), GFP_KERNEL); + if (!pg->clks) + return -ENOMEM; + + for (i = 0; i < count; i++) { + pg->clks[i] = of_clk_get(np, i); + if (IS_ERR(pg->clks[i])) { + err = PTR_ERR(pg->clks[i]); + goto err; + } + } + + pg->num_clks = count; + + return 0; + +err: + while (i--) + clk_put(pg->clks[i]); + kfree(pg->clks); + + return err; +} + +static int tegra_powergate_of_get_resets(struct tegra_powergate *pg, + struct device_node *np) +{ + struct reset_control *rst; + unsigned int i, count; + int err; + + count = of_count_phandle_with_args(np, "resets", "#reset-cells"); + if (count == 0) + return -ENODEV; + + pg->resets = kcalloc(count, sizeof(rst), GFP_KERNEL); + if (!pg->resets) + return -ENOMEM; + + for (i = 0; i < count; i++) { + pg->resets[i] = of_reset_control_get_by_index(np, i); + if (IS_ERR(pg->resets[i])) { + err = PTR_ERR(pg->resets[i]); + goto error; + } + } + + pg->num_resets = count; + + return 0; + +error: + while (i--) + reset_control_put(pg->resets[i]); + kfree(pg->resets); + + return err; +} + +static void tegra_powergate_add(struct tegra_pmc *pmc, struct device_node *np) +{ + struct tegra_powergate *pg; + bool off; + int id; + + pg = kzalloc(sizeof(*pg), GFP_KERNEL); + if (!pg) + goto error; + + id = tegra_powergate_lookup(pmc, np->name); + if (id < 0) + goto free_mem; + + /* + * Clear the bit for this powergate so it cannot be managed + * directly via the legacy APIs for controlling powergates. + */ + clear_bit(id, pmc->powergates_available); + + pg->id = id; + pg->genpd.name = np->name; + pg->genpd.power_off = tegra_genpd_power_off; + pg->genpd.power_on = tegra_genpd_power_on; + pg->pmc = pmc; + + if (tegra_powergate_of_get_clks(pg, np)) + goto set_available; + + if (tegra_powergate_of_get_resets(pg, np)) + goto remove_clks; + + off = !tegra_powergate_is_powered(pg->id); + + pm_genpd_init(&pg->genpd, NULL, off); + + if (of_genpd_add_provider_simple(np, &pg->genpd)) + goto remove_resets; + + dev_dbg(pmc->dev, "added power domain %s\n", pg->genpd.name); + + return; + +remove_resets: + while (pg->num_resets--) + reset_control_put(pg->resets[pg->num_resets]); + kfree(pg->resets); + +remove_clks: + while (pg->num_clks--) + clk_put(pg->clks[pg->num_clks]); + kfree(pg->clks); + +set_available: + set_bit(id, pmc->powergates_available); + +free_mem: + kfree(pg); + +error: + dev_err(pmc->dev, "failed to create power domain for %s\n", np->name); +} + +static void tegra_powergate_init(struct tegra_pmc *pmc) +{ + struct device_node *np, *child; + + np = of_get_child_by_name(pmc->dev->of_node, "powergates"); + if (!np) + return; + + for_each_child_of_node(np, child) { + tegra_powergate_add(pmc, child); + of_node_put(child); + } + + of_node_put(np); +} + static int tegra_io_rail_prepare(unsigned int id, unsigned long *request, unsigned long *status, unsigned int *bit) { @@ -887,6 +1242,8 @@ static int tegra_pmc_probe(struct platform_device *pdev) return err; } + tegra_powergate_init(pmc); + mutex_lock(&pmc->powergates_lock); iounmap(pmc->base); pmc->base = base; @@ -1120,6 +1477,7 @@ static int __init tegra_pmc_early_init(void) const struct of_device_id *match; struct device_node *np; struct resource regs; + unsigned int i; bool invert; u32 value; @@ -1169,6 +1527,11 @@ static int __init tegra_pmc_early_init(void) return -ENXIO; } + /* Create a bit-map of the available and valid partitions */ + for (i = 0; i < pmc->soc->num_powergates; i++) + if (pmc->soc->powergates[i]) + set_bit(i, pmc->powergates_available); + mutex_init(&pmc->powergates_lock); /* |