summaryrefslogtreecommitdiffstats
path: root/drivers/clk/ralink/clk-mt7621.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/clk/ralink/clk-mt7621.c')
-rw-r--r--drivers/clk/ralink/clk-mt7621.c583
1 files changed, 583 insertions, 0 deletions
diff --git a/drivers/clk/ralink/clk-mt7621.c b/drivers/clk/ralink/clk-mt7621.c
new file mode 100644
index 0000000000..92d14350c4
--- /dev/null
+++ b/drivers/clk/ralink/clk-mt7621.c
@@ -0,0 +1,583 @@
+// 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 & 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)
+{
+ /*
+ * 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 = {
+ .flags = CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
+ .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;
+ clk_data->num = count;
+
+ 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;
+ }
+
+ 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);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-14 15:46:10 +0000