diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/clk/ralink/clk-mt7621.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/clk/ralink/clk-mt7621.c')
-rw-r--r-- | drivers/clk/ralink/clk-mt7621.c | 578 |
1 files changed, 578 insertions, 0 deletions
diff --git a/drivers/clk/ralink/clk-mt7621.c b/drivers/clk/ralink/clk-mt7621.c new file mode 100644 index 000000000..99256659d --- /dev/null +++ b/drivers/clk/ralink/clk-mt7621.c @@ -0,0 +1,578 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Mediatek MT7621 Clock Driver + * Author: Sergio Paracuellos <sergio.paracuellos@gmail.com> + */ + +#include <linux/bitfield.h> +#include <linux/bitops.h> +#include <linux/clk-provider.h> +#include <linux/clk.h> +#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 + +#define XTAL_MODE_SEL_MASK GENMASK(8, 6) +#define CPU_CLK_SEL_MASK GENMASK(31, 30) +#define CUR_CPU_FDIV_MASK GENMASK(12, 8) +#define CUR_CPU_FFRAC_MASK GENMASK(4, 0) +#define CPU_PLL_PREDIV_MASK GENMASK(13, 12) +#define CPU_PLL_FBDIV_MASK GENMASK(10, 4) + +struct mt7621_clk_priv { + struct regmap *sysc; + struct regmap *memc; +}; + +struct mt7621_clk { + struct clk_hw hw; + struct mt7621_clk_priv *priv; +}; + +struct mt7621_fixed_clk { + u8 idx; + const char *name; + const char *parent_name; + unsigned long rate; + struct clk_hw *hw; +}; + +struct mt7621_gate { + u8 idx; + const char *name; + const char *parent_name; + struct mt7621_clk_priv *priv; + u32 bit_idx; + struct clk_hw hw; +}; + +#define GATE(_id, _name, _pname, _shift) \ + { \ + .idx = _id, \ + .name = _name, \ + .parent_name = _pname, \ + .bit_idx = _shift \ + } + +static struct mt7621_gate mt7621_gates[] = { + GATE(MT7621_CLK_HSDMA, "hsdma", "150m", BIT(5)), + GATE(MT7621_CLK_FE, "fe", "250m", BIT(6)), + GATE(MT7621_CLK_SP_DIVTX, "sp_divtx", "270m", BIT(7)), + GATE(MT7621_CLK_TIMER, "timer", "50m", BIT(8)), + GATE(MT7621_CLK_PCM, "pcm", "270m", BIT(11)), + GATE(MT7621_CLK_PIO, "pio", "50m", BIT(13)), + GATE(MT7621_CLK_GDMA, "gdma", "bus", BIT(14)), + GATE(MT7621_CLK_NAND, "nand", "125m", BIT(15)), + GATE(MT7621_CLK_I2C, "i2c", "50m", BIT(16)), + GATE(MT7621_CLK_I2S, "i2s", "270m", BIT(17)), + GATE(MT7621_CLK_SPI, "spi", "bus", BIT(18)), + GATE(MT7621_CLK_UART1, "uart1", "50m", BIT(19)), + GATE(MT7621_CLK_UART2, "uart2", "50m", BIT(20)), + GATE(MT7621_CLK_UART3, "uart3", "50m", BIT(21)), + GATE(MT7621_CLK_ETH, "eth", "50m", BIT(23)), + GATE(MT7621_CLK_PCIE0, "pcie0", "125m", BIT(24)), + GATE(MT7621_CLK_PCIE1, "pcie1", "125m", BIT(25)), + GATE(MT7621_CLK_PCIE2, "pcie2", "125m", BIT(26)), + GATE(MT7621_CLK_CRYPTO, "crypto", "250m", BIT(29)), + GATE(MT7621_CLK_SHXC, "shxc", "50m", BIT(30)) +}; + +static inline struct mt7621_gate *to_mt7621_gate(struct clk_hw *hw) +{ + return container_of(hw, struct mt7621_gate, hw); +} + +static int mt7621_gate_enable(struct clk_hw *hw) +{ + struct mt7621_gate *clk_gate = to_mt7621_gate(hw); + struct regmap *sysc = clk_gate->priv->sysc; + + return regmap_update_bits(sysc, SYSC_REG_CLKCFG1, + clk_gate->bit_idx, clk_gate->bit_idx); +} + +static void mt7621_gate_disable(struct clk_hw *hw) +{ + struct mt7621_gate *clk_gate = to_mt7621_gate(hw); + struct regmap *sysc = clk_gate->priv->sysc; + + regmap_update_bits(sysc, SYSC_REG_CLKCFG1, clk_gate->bit_idx, 0); +} + +static int mt7621_gate_is_enabled(struct clk_hw *hw) +{ + struct mt7621_gate *clk_gate = to_mt7621_gate(hw); + struct regmap *sysc = clk_gate->priv->sysc; + u32 val; + + if (regmap_read(sysc, SYSC_REG_CLKCFG1, &val)) + return 0; + + return val & BIT(clk_gate->bit_idx); +} + +static const struct clk_ops mt7621_gate_ops = { + .enable = mt7621_gate_enable, + .disable = mt7621_gate_disable, + .is_enabled = mt7621_gate_is_enabled, +}; + +static int mt7621_gate_ops_init(struct device *dev, + struct mt7621_gate *sclk) +{ + struct clk_init_data init = { + .flags = CLK_SET_RATE_PARENT, + .num_parents = 1, + .parent_names = &sclk->parent_name, + .ops = &mt7621_gate_ops, + .name = sclk->name, + }; + + sclk->hw.init = &init; + return devm_clk_hw_register(dev, &sclk->hw); +} + +static int mt7621_register_gates(struct device *dev, + struct clk_hw_onecell_data *clk_data, + struct mt7621_clk_priv *priv) +{ + struct clk_hw **hws = clk_data->hws; + struct mt7621_gate *sclk; + int ret, i; + + for (i = 0; i < ARRAY_SIZE(mt7621_gates); i++) { + sclk = &mt7621_gates[i]; + sclk->priv = priv; + ret = mt7621_gate_ops_init(dev, sclk); + if (ret) { + dev_err(dev, "Couldn't register clock %s\n", sclk->name); + goto err_clk_unreg; + } + + hws[sclk->idx] = &sclk->hw; + } + + return 0; + +err_clk_unreg: + while (--i >= 0) { + sclk = &mt7621_gates[i]; + clk_hw_unregister(&sclk->hw); + } + return ret; +} + +#define FIXED(_id, _name, _rate) \ + { \ + .idx = _id, \ + .name = _name, \ + .parent_name = "xtal", \ + .rate = _rate \ + } + +static struct mt7621_fixed_clk mt7621_fixed_clks[] = { + FIXED(MT7621_CLK_50M, "50m", 50000000), + FIXED(MT7621_CLK_125M, "125m", 125000000), + FIXED(MT7621_CLK_150M, "150m", 150000000), + FIXED(MT7621_CLK_250M, "250m", 250000000), + FIXED(MT7621_CLK_270M, "270m", 270000000), +}; + +static int mt7621_register_fixed_clocks(struct device *dev, + struct clk_hw_onecell_data *clk_data) +{ + struct clk_hw **hws = clk_data->hws; + struct mt7621_fixed_clk *sclk; + int ret, i; + + for (i = 0; i < ARRAY_SIZE(mt7621_fixed_clks); i++) { + sclk = &mt7621_fixed_clks[i]; + sclk->hw = clk_hw_register_fixed_rate(dev, sclk->name, + sclk->parent_name, 0, + sclk->rate); + if (IS_ERR(sclk->hw)) { + dev_err(dev, "Couldn't register clock %s\n", sclk->name); + ret = PTR_ERR(sclk->hw); + goto err_clk_unreg; + } + + hws[sclk->idx] = sclk->hw; + } + + return 0; + +err_clk_unreg: + while (--i >= 0) { + sclk = &mt7621_fixed_clks[i]; + clk_hw_unregister_fixed_rate(sclk->hw); + } + return ret; +} + +static inline struct mt7621_clk *to_mt7621_clk(struct clk_hw *hw) +{ + return container_of(hw, struct mt7621_clk, hw); +} + +static unsigned long mt7621_xtal_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct mt7621_clk *clk = to_mt7621_clk(hw); + struct regmap *sysc = clk->priv->sysc; + u32 val; + + regmap_read(sysc, SYSC_REG_SYSTEM_CONFIG0, &val); + val = FIELD_GET(XTAL_MODE_SEL_MASK, val); + + if (val <= 2) + return 20000000; + if (val <= 5) + return 40000000; + + return 25000000; +} + +static unsigned long mt7621_cpu_recalc_rate(struct clk_hw *hw, + unsigned long xtal_clk) +{ + static const u32 prediv_tbl[] = { 0, 1, 2, 2 }; + struct mt7621_clk *clk = to_mt7621_clk(hw); + struct regmap *sysc = clk->priv->sysc; + struct regmap *memc = clk->priv->memc; + u32 clkcfg, clk_sel, curclk, ffiv, ffrac; + u32 pll, prediv, fbdiv; + unsigned long cpu_clk; + + regmap_read(sysc, SYSC_REG_CLKCFG0, &clkcfg); + clk_sel = FIELD_GET(CPU_CLK_SEL_MASK, clkcfg); + + regmap_read(sysc, SYSC_REG_CUR_CLK_STS, &curclk); + ffiv = FIELD_GET(CUR_CPU_FDIV_MASK, curclk); + ffrac = FIELD_GET(CUR_CPU_FFRAC_MASK, curclk); + + switch (clk_sel) { + case 0: + cpu_clk = 500000000; + break; + case 1: + regmap_read(memc, MEMC_REG_CPU_PLL, &pll); + fbdiv = FIELD_GET(CPU_PLL_FBDIV_MASK, pll); + prediv = FIELD_GET(CPU_PLL_PREDIV_MASK, pll); + cpu_clk = ((fbdiv + 1) * xtal_clk) >> prediv_tbl[prediv]; + break; + default: + cpu_clk = xtal_clk; + } + + return cpu_clk / ffiv * ffrac; +} + +static unsigned long mt7621_bus_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + return parent_rate / 4; +} + +#define CLK_BASE(_name, _parent, _recalc) { \ + .init = &(struct clk_init_data) { \ + .name = _name, \ + .ops = &(const struct clk_ops) { \ + .recalc_rate = _recalc, \ + }, \ + .parent_data = &(const struct clk_parent_data) { \ + .name = _parent, \ + .fw_name = _parent \ + }, \ + .num_parents = _parent ? 1 : 0 \ + }, \ +} + +static struct mt7621_clk mt7621_clks_base[] = { + { CLK_BASE("xtal", NULL, mt7621_xtal_recalc_rate) }, + { CLK_BASE("cpu", "xtal", mt7621_cpu_recalc_rate) }, + { CLK_BASE("bus", "cpu", mt7621_bus_recalc_rate) }, +}; + +static struct clk_hw *mt7621_clk_early[MT7621_CLK_MAX]; + +static int mt7621_register_early_clocks(struct device_node *np, + struct clk_hw_onecell_data *clk_data, + struct mt7621_clk_priv *priv) +{ + struct clk_hw **hws = clk_data->hws; + struct mt7621_clk *sclk; + int ret, i, j; + + for (i = 0; i < ARRAY_SIZE(mt7621_clks_base); i++) { + sclk = &mt7621_clks_base[i]; + sclk->priv = priv; + ret = of_clk_hw_register(np, &sclk->hw); + if (ret) { + pr_err("Couldn't register top clock %i\n", i); + goto err_clk_unreg; + } + + hws[i] = &sclk->hw; + mt7621_clk_early[i] = &sclk->hw; + } + + for (j = i; j < MT7621_CLK_MAX; j++) + mt7621_clk_early[j] = ERR_PTR(-EPROBE_DEFER); + + return 0; + +err_clk_unreg: + while (--i >= 0) { + sclk = &mt7621_clks_base[i]; + clk_hw_unregister(&sclk->hw); + } + return ret; +} + +static void __init mt7621_clk_init(struct device_node *node) +{ + struct mt7621_clk_priv *priv; + struct clk_hw_onecell_data *clk_data; + int ret, i, count; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return; + + priv->sysc = syscon_node_to_regmap(node); + if (IS_ERR(priv->sysc)) { + pr_err("Could not get sysc syscon regmap\n"); + goto free_clk_priv; + } + + priv->memc = syscon_regmap_lookup_by_phandle(node, "ralink,memctl"); + if (IS_ERR(priv->memc)) { + pr_err("Could not get memc syscon regmap\n"); + goto free_clk_priv; + } + + count = ARRAY_SIZE(mt7621_clks_base) + + ARRAY_SIZE(mt7621_fixed_clks) + ARRAY_SIZE(mt7621_gates); + clk_data = kzalloc(struct_size(clk_data, hws, count), GFP_KERNEL); + if (!clk_data) + goto free_clk_priv; + + ret = mt7621_register_early_clocks(node, clk_data, priv); + if (ret) { + pr_err("Couldn't register top clocks\n"); + goto free_clk_data; + } + + clk_data->num = count; + + ret = of_clk_add_hw_provider(node, of_clk_hw_onecell_get, clk_data); + if (ret) { + pr_err("Couldn't add clk hw provider\n"); + goto unreg_clk_top; + } + + return; + +unreg_clk_top: + for (i = 0; i < ARRAY_SIZE(mt7621_clks_base); i++) { + struct mt7621_clk *sclk = &mt7621_clks_base[i]; + + clk_hw_unregister(&sclk->hw); + } + +free_clk_data: + kfree(clk_data); + +free_clk_priv: + kfree(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; + struct clk_hw_onecell_data *clk_data; + struct device *dev = &pdev->dev; + struct mt7621_clk_priv *priv; + int ret, i, count; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->sysc = syscon_node_to_regmap(np); + if (IS_ERR(priv->sysc)) { + ret = PTR_ERR(priv->sysc); + dev_err(dev, "Could not get sysc syscon regmap\n"); + return ret; + } + + priv->memc = syscon_regmap_lookup_by_phandle(np, "ralink,memctl"); + if (IS_ERR(priv->memc)) { + ret = PTR_ERR(priv->memc); + dev_err(dev, "Could not get memc syscon regmap\n"); + 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; + + for (i = 0; i < ARRAY_SIZE(mt7621_clks_base); i++) + clk_data->hws[i] = mt7621_clk_early[i]; + + ret = mt7621_register_fixed_clocks(dev, clk_data); + if (ret) { + dev_err(dev, "Couldn't register fixed clocks\n"); + return ret; + } + + ret = mt7621_register_gates(dev, clk_data, priv); + if (ret) { + dev_err(dev, "Couldn't register fixed clock gates\n"); + 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"); + goto unreg_clk_gates; + } + + return 0; + +unreg_clk_gates: + for (i = 0; i < ARRAY_SIZE(mt7621_gates); i++) { + struct mt7621_gate *sclk = &mt7621_gates[i]; + + clk_hw_unregister(&sclk->hw); + } + +unreg_clk_fixed: + for (i = 0; i < ARRAY_SIZE(mt7621_fixed_clks); i++) { + struct mt7621_fixed_clk *sclk = &mt7621_fixed_clks[i]; + + clk_hw_unregister_fixed_rate(sclk->hw); + } + + return ret; +} + +static const struct of_device_id mt7621_clk_of_match[] = { + { .compatible = "mediatek,mt7621-sysc" }, + {} +}; + +static struct platform_driver mt7621_clk_driver = { + .probe = mt7621_clk_probe, + .driver = { + .name = "mt7621-clk", + .of_match_table = mt7621_clk_of_match, + }, +}; + +static int __init mt7621_clk_reset_init(void) +{ + return platform_driver_register(&mt7621_clk_driver); +} +arch_initcall(mt7621_clk_reset_init); |