diff options
| -rw-r--r-- | drivers/soc/tegra/pmc.c | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c index 1699dda6b393..ecce91517af2 100644 --- a/drivers/soc/tegra/pmc.c +++ b/drivers/soc/tegra/pmc.c @@ -13,9 +13,13 @@ #include <linux/arm-smccc.h> #include <linux/clk.h> +#include <linux/clk-provider.h> +#include <linux/clkdev.h> +#include <linux/clk/clk-conf.h> #include <linux/clk/tegra.h> #include <linux/debugfs.h> #include <linux/delay.h> +#include <linux/device.h> #include <linux/err.h> #include <linux/export.h> #include <linux/init.h> @@ -48,6 +52,7 @@ #include <dt-bindings/pinctrl/pinctrl-tegra-io-pad.h> #include <dt-bindings/gpio/tegra186-gpio.h> #include <dt-bindings/gpio/tegra194-gpio.h> +#include <dt-bindings/soc/tegra-pmc.h> #define PMC_CNTRL 0x0 #define PMC_CNTRL_INTR_POLARITY BIT(17) /* inverts INTR polarity */ @@ -100,6 +105,8 @@ #define PMC_WAKE2_STATUS 0x168 #define PMC_SW_WAKE2_STATUS 0x16c +#define PMC_CLK_OUT_CNTRL 0x1a8 +#define PMC_CLK_OUT_MUX_MASK GENMASK(1, 0) #define PMC_SENSOR_CTRL 0x1b0 #define PMC_SENSOR_CTRL_SCRATCH_WRITE BIT(2) #define PMC_SENSOR_CTRL_ENABLE_RST BIT(1) @@ -155,6 +162,63 @@ #define TEGRA_SMC_PMC_READ 0xaa #define TEGRA_SMC_PMC_WRITE 0xbb +struct pmc_clk { + struct clk_hw hw; + unsigned long offs; + u32 mux_shift; + u32 force_en_shift; +}; + +#define to_pmc_clk(_hw) container_of(_hw, struct pmc_clk, hw) + +struct pmc_clk_init_data { + char *name; + const char *const *parents; + int num_parents; + int clk_id; + u8 mux_shift; + u8 force_en_shift; +}; + +static const char * const clk_out1_parents[] = { "osc", "osc_div2", + "osc_div4", "extern1", +}; + +static const char * const clk_out2_parents[] = { "osc", "osc_div2", + "osc_div4", "extern2", +}; + +static const char * const clk_out3_parents[] = { "osc", "osc_div2", + "osc_div4", "extern3", +}; + +static const struct pmc_clk_init_data tegra_pmc_clks_data[] = { + { + .name = "pmc_clk_out_1", + .parents = clk_out1_parents, + .num_parents = ARRAY_SIZE(clk_out1_parents), + .clk_id = TEGRA_PMC_CLK_OUT_1, + .mux_shift = 6, + .force_en_shift = 2, + }, + { + .name = "pmc_clk_out_2", + .parents = clk_out2_parents, + .num_parents = ARRAY_SIZE(clk_out2_parents), + .clk_id = TEGRA_PMC_CLK_OUT_2, + .mux_shift = 14, + .force_en_shift = 10, + }, + { + .name = "pmc_clk_out_3", + .parents = clk_out3_parents, + .num_parents = ARRAY_SIZE(clk_out3_parents), + .clk_id = TEGRA_PMC_CLK_OUT_3, + .mux_shift = 22, + .force_en_shift = 18, + }, +}; + struct tegra_powergate { struct generic_pm_domain genpd; struct tegra_pmc *pmc; @@ -254,6 +318,9 @@ struct tegra_pmc_soc { */ const struct tegra_wake_event *wake_events; unsigned int num_wake_events; + + const struct pmc_clk_init_data *pmc_clks_data; + unsigned int num_pmc_clks; }; static const char * const tegra186_reset_sources[] = { @@ -2163,6 +2230,166 @@ static int tegra_pmc_clk_notify_cb(struct notifier_block *nb, return NOTIFY_OK; } +static void pmc_clk_fence_udelay(u32 offset) +{ + tegra_pmc_readl(pmc, offset); + /* pmc clk propagation delay 2 us */ + udelay(2); +} + +static u8 pmc_clk_mux_get_parent(struct clk_hw *hw) +{ + struct pmc_clk *clk = to_pmc_clk(hw); + u32 val; + + val = tegra_pmc_readl(pmc, clk->offs) >> clk->mux_shift; + val &= PMC_CLK_OUT_MUX_MASK; + + return val; +} + +static int pmc_clk_mux_set_parent(struct clk_hw *hw, u8 index) +{ + struct pmc_clk *clk = to_pmc_clk(hw); + u32 val; + + val = tegra_pmc_readl(pmc, clk->offs); + val &= ~(PMC_CLK_OUT_MUX_MASK << clk->mux_shift); + val |= index << clk->mux_shift; + tegra_pmc_writel(pmc, val, clk->offs); + pmc_clk_fence_udelay(clk->offs); + + return 0; +} + +static int pmc_clk_is_enabled(struct clk_hw *hw) +{ + struct pmc_clk *clk = to_pmc_clk(hw); + u32 val; + + val = tegra_pmc_readl(pmc, clk->offs) & BIT(clk->force_en_shift); + + return val ? 1 : 0; +} + +static void pmc_clk_set_state(unsigned long offs, u32 shift, int state) +{ + u32 val; + + val = tegra_pmc_readl(pmc, offs); + val = state ? (val | BIT(shift)) : (val & ~BIT(shift)); + tegra_pmc_writel(pmc, val, offs); + pmc_clk_fence_udelay(offs); +} + +static int pmc_clk_enable(struct clk_hw *hw) +{ + struct pmc_clk *clk = to_pmc_clk(hw); + + pmc_clk_set_state(clk->offs, clk->force_en_shift, 1); + + return 0; +} + +static void pmc_clk_disable(struct clk_hw *hw) +{ + struct pmc_clk *clk = to_pmc_clk(hw); + + pmc_clk_set_state(clk->offs, clk->force_en_shift, 0); +} + +static const struct clk_ops pmc_clk_ops = { + .get_parent = pmc_clk_mux_get_parent, + .set_parent = pmc_clk_mux_set_parent, + .determine_rate = __clk_mux_determine_rate, + .is_enabled = pmc_clk_is_enabled, + .enable = pmc_clk_enable, + .disable = pmc_clk_disable, +}; + +static struct clk * +tegra_pmc_clk_out_register(struct tegra_pmc *pmc, + const struct pmc_clk_init_data *data, + unsigned long offset) +{ + struct clk_init_data init; + struct pmc_clk *pmc_clk; + + pmc_clk = devm_kzalloc(pmc->dev, sizeof(*pmc_clk), GFP_KERNEL); + if (!pmc_clk) + return ERR_PTR(-ENOMEM); + + init.name = data->name; + init.ops = &pmc_clk_ops; + init.parent_names = data->parents; + init.num_parents = data->num_parents; + init.flags = CLK_SET_RATE_NO_REPARENT | CLK_SET_RATE_PARENT | + CLK_SET_PARENT_GATE; + + pmc_clk->hw.init = &init; + pmc_clk->offs = offset; + pmc_clk->mux_shift = data->mux_shift; + pmc_clk->force_en_shift = data->force_en_shift; + + return clk_register(NULL, &pmc_clk->hw); +} + +static void tegra_pmc_clock_register(struct tegra_pmc *pmc, + struct device_node *np) +{ + struct clk *clk; + struct clk_onecell_data *clk_data; + unsigned int num_clks; + int i, err; + + num_clks = pmc->soc->num_pmc_clks; + + if (!num_clks) + return; + + clk_data = devm_kmalloc(pmc->dev, sizeof(*clk_data), GFP_KERNEL); + if (!clk_data) + return; + + clk_data->clks = devm_kcalloc(pmc->dev, TEGRA_PMC_CLK_MAX, + sizeof(*clk_data->clks), GFP_KERNEL); + if (!clk_data->clks) + return; + + clk_data->clk_num = TEGRA_PMC_CLK_MAX; + + for (i = 0; i < TEGRA_PMC_CLK_MAX; i++) + clk_data->clks[i] = ERR_PTR(-ENOENT); + + for (i = 0; i < pmc->soc->num_pmc_clks; i++) { + const struct pmc_clk_init_data *data; + + data = pmc->soc->pmc_clks_data + i; + + clk = tegra_pmc_clk_out_register(pmc, data, PMC_CLK_OUT_CNTRL); + if (IS_ERR(clk)) { + dev_warn(pmc->dev, "unable to register clock %s: %d\n", + data->name, PTR_ERR_OR_ZERO(clk)); + return; + } + + err = clk_register_clkdev(clk, data->name, NULL); + if (err) { + dev_warn(pmc->dev, + "unable to register %s clock lookup: %d\n", + data->name, err); + return; + } + + clk_data->clks[data->clk_id] = clk; + } + + err = of_clk_add_provider(np, of_clk_src_onecell_get, clk_data); + if (err) + dev_warn(pmc->dev, "failed to add pmc clock provider: %d\n", + err); +} + static int tegra_pmc_probe(struct platform_device *pdev) { void __iomem *base; @@ -2281,6 +2508,7 @@ static int tegra_pmc_probe(struct platform_device *pdev) pmc->base = base; mutex_unlock(&pmc->powergates_lock); + tegra_pmc_clock_register(pmc, pdev->dev.of_node); platform_set_drvdata(pdev, pmc); return 0; @@ -2422,6 +2650,8 @@ static const struct tegra_pmc_soc tegra20_pmc_soc = { .num_reset_sources = 0, .reset_levels = NULL, .num_reset_levels = 0, + .pmc_clks_data = NULL, + .num_pmc_clks = 0, }; static const char * const tegra30_powergates[] = { @@ -2469,6 +2699,8 @@ static const struct tegra_pmc_soc tegra30_pmc_soc = { .num_reset_sources = ARRAY_SIZE(tegra30_reset_sources), .reset_levels = NULL, .num_reset_levels = 0, + .pmc_clks_data = tegra_pmc_clks_data, + .num_pmc_clks = ARRAY_SIZE(tegra_pmc_clks_data), }; static const char * const tegra114_powergates[] = { @@ -2520,6 +2752,8 @@ static const struct tegra_pmc_soc tegra114_pmc_soc = { .num_reset_sources = ARRAY_SIZE(tegra30_reset_sources), .reset_levels = NULL, .num_reset_levels = 0, + .pmc_clks_data = tegra_pmc_clks_data, + .num_pmc_clks = ARRAY_SIZE(tegra_pmc_clks_data), }; static const char * const tegra124_powergates[] = { @@ -2631,6 +2865,8 @@ static const struct tegra_pmc_soc tegra124_pmc_soc = { .num_reset_sources = ARRAY_SIZE(tegra30_reset_sources), .reset_levels = NULL, .num_reset_levels = 0, + .pmc_clks_data = tegra_pmc_clks_data, + .num_pmc_clks = ARRAY_SIZE(tegra_pmc_clks_data), }; static const char * const tegra210_powergates[] = { @@ -2745,6 +2981,8 @@ static const struct tegra_pmc_soc tegra210_pmc_soc = { .num_reset_levels = 0, .num_wake_events = ARRAY_SIZE(tegra210_wake_events), .wake_events = tegra210_wake_events, + .pmc_clks_data = tegra_pmc_clks_data, + .num_pmc_clks = ARRAY_SIZE(tegra_pmc_clks_data), }; #define TEGRA186_IO_PAD_TABLE(_pad) \ @@ -2874,6 +3112,8 @@ static const struct tegra_pmc_soc tegra186_pmc_soc = { .num_reset_levels = ARRAY_SIZE(tegra186_reset_levels), .num_wake_events = ARRAY_SIZE(tegra186_wake_events), .wake_events = tegra186_wake_events, + .pmc_clks_data = NULL, + .num_pmc_clks = 0, }; static const struct tegra_io_pad_soc tegra194_io_pads[] = { @@ -2991,6 +3231,8 @@ static const struct tegra_pmc_soc tegra194_pmc_soc = { .num_reset_levels = ARRAY_SIZE(tegra186_reset_levels), .num_wake_events = ARRAY_SIZE(tegra194_wake_events), .wake_events = tegra194_wake_events, + .pmc_clks_data = NULL, + .num_pmc_clks = 0, }; static const struct of_device_id tegra_pmc_match[] = { |