diff options
Diffstat (limited to 'drivers/clk/ralink/clk-mt7621.c')
| -rw-r--r-- | drivers/clk/ralink/clk-mt7621.c | 110 |
1 files changed, 99 insertions, 11 deletions
diff --git a/drivers/clk/ralink/clk-mt7621.c b/drivers/clk/ralink/clk-mt7621.c index 857da1e274be..92d14350c4b3 100644 --- a/drivers/clk/ralink/clk-mt7621.c +++ b/drivers/clk/ralink/clk-mt7621.c @@ -11,14 +11,17 @@ #include <linux/mfd/syscon.h> #include <linux/platform_device.h> #include <linux/regmap.h> +#include <linux/reset-controller.h> #include <linux/slab.h> #include <dt-bindings/clock/mt7621-clk.h> +#include <dt-bindings/reset/mt7621-reset.h> /* Configuration registers */ #define SYSC_REG_SYSTEM_CONFIG0 0x10 #define SYSC_REG_SYSTEM_CONFIG1 0x14 #define SYSC_REG_CLKCFG0 0x2c #define SYSC_REG_CLKCFG1 0x30 +#define SYSC_REG_RESET_CTRL 0x34 #define SYSC_REG_CUR_CLK_STS 0x44 #define MEMC_REG_CPU_PLL 0x648 @@ -118,7 +121,7 @@ static int mt7621_gate_is_enabled(struct clk_hw *hw) if (regmap_read(sysc, SYSC_REG_CLKCFG1, &val)) return 0; - return val & BIT(clk_gate->bit_idx); + return val & clk_gate->bit_idx; } static const struct clk_ops mt7621_gate_ops = { @@ -130,14 +133,13 @@ static const struct clk_ops mt7621_gate_ops = { static int mt7621_gate_ops_init(struct device *dev, struct mt7621_gate *sclk) { + /* + * There are drivers for this SoC that are older + * than clock driver and are not prepared for the clock. + * We don't want the kernel to disable anything so we + * add CLK_IS_CRITICAL flag here. + */ struct clk_init_data init = { - /* - * Until now no clock driver existed so - * these SoC drivers are not prepared - * yet for the clock. We don't want kernel to - * disable anything so we add CLK_IS_CRITICAL - * flag here. - */ .flags = CLK_SET_RATE_PARENT | CLK_IS_CRITICAL, .num_parents = 1, .parent_names = &sclk->parent_name, @@ -405,6 +407,82 @@ free_clk_priv: } CLK_OF_DECLARE_DRIVER(mt7621_clk, "mediatek,mt7621-sysc", mt7621_clk_init); +struct mt7621_rst { + struct reset_controller_dev rcdev; + struct regmap *sysc; +}; + +static struct mt7621_rst *to_mt7621_rst(struct reset_controller_dev *dev) +{ + return container_of(dev, struct mt7621_rst, rcdev); +} + +static int mt7621_assert_device(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct mt7621_rst *data = to_mt7621_rst(rcdev); + struct regmap *sysc = data->sysc; + + return regmap_update_bits(sysc, SYSC_REG_RESET_CTRL, BIT(id), BIT(id)); +} + +static int mt7621_deassert_device(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct mt7621_rst *data = to_mt7621_rst(rcdev); + struct regmap *sysc = data->sysc; + + return regmap_update_bits(sysc, SYSC_REG_RESET_CTRL, BIT(id), 0); +} + +static int mt7621_reset_device(struct reset_controller_dev *rcdev, + unsigned long id) +{ + int ret; + + ret = mt7621_assert_device(rcdev, id); + if (ret < 0) + return ret; + + return mt7621_deassert_device(rcdev, id); +} + +static int mt7621_rst_xlate(struct reset_controller_dev *rcdev, + const struct of_phandle_args *reset_spec) +{ + unsigned long id = reset_spec->args[0]; + + if (id == MT7621_RST_SYS || id >= rcdev->nr_resets) + return -EINVAL; + + return id; +} + +static const struct reset_control_ops reset_ops = { + .reset = mt7621_reset_device, + .assert = mt7621_assert_device, + .deassert = mt7621_deassert_device +}; + +static int mt7621_reset_init(struct device *dev, struct regmap *sysc) +{ + struct mt7621_rst *rst_data; + + rst_data = devm_kzalloc(dev, sizeof(*rst_data), GFP_KERNEL); + if (!rst_data) + return -ENOMEM; + + rst_data->sysc = sysc; + rst_data->rcdev.ops = &reset_ops; + rst_data->rcdev.owner = THIS_MODULE; + rst_data->rcdev.nr_resets = 32; + rst_data->rcdev.of_reset_n_cells = 1; + rst_data->rcdev.of_xlate = mt7621_rst_xlate; + rst_data->rcdev.of_node = dev_of_node(dev); + + return devm_reset_controller_register(dev, &rst_data->rcdev); +} + static int mt7621_clk_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; @@ -431,12 +509,19 @@ static int mt7621_clk_probe(struct platform_device *pdev) return ret; } + ret = mt7621_reset_init(dev, priv->sysc); + if (ret) { + dev_err(dev, "Could not init reset controller\n"); + return ret; + } + count = ARRAY_SIZE(mt7621_clks_base) + ARRAY_SIZE(mt7621_fixed_clks) + ARRAY_SIZE(mt7621_gates); clk_data = devm_kzalloc(dev, struct_size(clk_data, hws, count), GFP_KERNEL); if (!clk_data) return -ENOMEM; + clk_data->num = count; for (i = 0; i < ARRAY_SIZE(mt7621_clks_base); i++) clk_data->hws[i] = mt7621_clk_early[i]; @@ -453,8 +538,6 @@ static int mt7621_clk_probe(struct platform_device *pdev) goto unreg_clk_fixed; } - clk_data->num = count; - ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clk_data); if (ret) { dev_err(dev, "Couldn't add clk hw provider\n"); @@ -492,4 +575,9 @@ static struct platform_driver mt7621_clk_driver = { .of_match_table = mt7621_clk_of_match, }, }; -builtin_platform_driver(mt7621_clk_driver); + +static int __init mt7621_clk_reset_init(void) +{ + return platform_driver_register(&mt7621_clk_driver); +} +arch_initcall(mt7621_clk_reset_init); |