[PATCH 2/4] clk: airoha: Add support for Airoha AN7581 SoC clock
Christian Marangi
ansuelsmth at gmail.com
Sun Mar 9 15:06:44 CET 2025
Add support for Airoha AN7581 SoC clock driver. This mainly needed for
eMMC support to correctly get the current clock applied.
Based on the Linux clk-en7523.c but majorly reworked for U-Boot that
doesn't require CCF subsystem.
Major modification, support for set_rate, realtime get_rate and split
for reset part to a different driver.
Signed-off-by: Christian Marangi <ansuelsmth at gmail.com>
---
drivers/clk/Makefile | 1 +
drivers/clk/airoha/Makefile | 3 +
drivers/clk/airoha/clk-airoha.c | 438 +++++++++++++++++++++++++
include/dt-bindings/clock/en7523-clk.h | 17 +
4 files changed, 459 insertions(+)
create mode 100644 drivers/clk/airoha/Makefile
create mode 100644 drivers/clk/airoha/clk-airoha.c
create mode 100644 include/dt-bindings/clock/en7523-clk.h
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index fe0e49f6112..8411205ee04 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_$(PHASE_)CLK_GPIO) += clk-gpio.o
obj-$(CONFIG_$(PHASE_)CLK_STUB) += clk-stub.o
obj-y += adi/
+obj-y += airoha/
obj-y += analogbits/
obj-y += imx/
obj-$(CONFIG_CLK_JH7110) += starfive/
diff --git a/drivers/clk/airoha/Makefile b/drivers/clk/airoha/Makefile
new file mode 100644
index 00000000000..1744c5f7236
--- /dev/null
+++ b/drivers/clk/airoha/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+# Core
+obj-$(CONFIG_ARCH_AIROHA) += clk-airoha.o
diff --git a/drivers/clk/airoha/clk-airoha.c b/drivers/clk/airoha/clk-airoha.c
new file mode 100644
index 00000000000..96d120feba7
--- /dev/null
+++ b/drivers/clk/airoha/clk-airoha.c
@@ -0,0 +1,438 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Based on the Linux clk-en7523.c but majorly reworked
+ * for U-Boot that doesn't require CCF subsystem.
+ *
+ * Major modification, support for set_rate, realtime
+ * get_rate and split for reset part to a different driver.
+ *
+ * Author: Lorenzo Bianconi <lorenzo at kernel.org> (original driver)
+ * Christian Marangi <ansuelsmth at gmail.com>
+ */
+
+#include <clk-uclass.h>
+#include <dm.h>
+#include <dm/devres.h>
+#include <dm/device_compat.h>
+#include <dm/lists.h>
+#include <regmap.h>
+#include <syscon.h>
+
+#include <dt-bindings/clock/en7523-clk.h>
+
+#define REG_GSW_CLK_DIV_SEL 0x1b4
+#define REG_EMI_CLK_DIV_SEL 0x1b8
+#define REG_BUS_CLK_DIV_SEL 0x1bc
+#define REG_SPI_CLK_DIV_SEL 0x1c4
+#define REG_SPI_CLK_FREQ_SEL 0x1c8
+#define REG_NPU_CLK_DIV_SEL 0x1fc
+
+#define REG_NP_SCU_PCIC 0x88
+#define REG_NP_SCU_SSTR 0x9c
+#define REG_PCIE_XSI0_SEL_MASK GENMASK(14, 13)
+#define REG_PCIE_XSI1_SEL_MASK GENMASK(12, 11)
+#define REG_CRYPTO_CLKSRC2 0x20c
+
+#define EN7581_MAX_CLKS 9
+
+struct airoha_clk_desc {
+ int id;
+ const char *name;
+ u32 base_reg;
+ u8 base_bits;
+ u8 base_shift;
+ union {
+ const unsigned int *base_values;
+ unsigned int base_value;
+ };
+ size_t n_base_values;
+
+ u16 div_reg;
+ u8 div_bits;
+ u8 div_shift;
+ u16 div_val0;
+ u8 div_step;
+ u8 div_offset;
+};
+
+struct airoha_clk_priv {
+ struct regmap *chip_scu_map;
+ struct airoha_clk_soc_data *data;
+};
+
+struct airoha_clk_soc_data {
+ u32 num_clocks;
+ const struct airoha_clk_desc *descs;
+};
+
+static const u32 gsw_base[] = { 400000000, 500000000 };
+static const u32 slic_base[] = { 100000000, 3125000 };
+
+static const u32 emi7581_base[] = { 540000000, 480000000, 400000000, 300000000 };
+static const u32 bus7581_base[] = { 600000000, 540000000 };
+static const u32 npu7581_base[] = { 800000000, 750000000, 720000000, 600000000 };
+static const u32 crypto_base[] = { 540000000, 480000000 };
+static const u32 emmc7581_base[] = { 200000000, 150000000 };
+
+static const struct airoha_clk_desc en7581_base_clks[EN7581_MAX_CLKS] = {
+ [EN7523_CLK_GSW] = {
+ .id = EN7523_CLK_GSW,
+ .name = "gsw",
+
+ .base_reg = REG_GSW_CLK_DIV_SEL,
+ .base_bits = 1,
+ .base_shift = 8,
+ .base_values = gsw_base,
+ .n_base_values = ARRAY_SIZE(gsw_base),
+
+ .div_bits = 3,
+ .div_shift = 0,
+ .div_step = 1,
+ .div_offset = 1,
+ },
+ [EN7523_CLK_EMI] = {
+ .id = EN7523_CLK_EMI,
+ .name = "emi",
+
+ .base_reg = REG_EMI_CLK_DIV_SEL,
+ .base_bits = 2,
+ .base_shift = 8,
+ .base_values = emi7581_base,
+ .n_base_values = ARRAY_SIZE(emi7581_base),
+
+ .div_bits = 3,
+ .div_shift = 0,
+ .div_step = 1,
+ .div_offset = 1,
+ },
+ [EN7523_CLK_BUS] = {
+ .id = EN7523_CLK_BUS,
+ .name = "bus",
+
+ .base_reg = REG_BUS_CLK_DIV_SEL,
+ .base_bits = 1,
+ .base_shift = 8,
+ .base_values = bus7581_base,
+ .n_base_values = ARRAY_SIZE(bus7581_base),
+
+ .div_bits = 3,
+ .div_shift = 0,
+ .div_step = 1,
+ .div_offset = 1,
+ },
+ [EN7523_CLK_SLIC] = {
+ .id = EN7523_CLK_SLIC,
+ .name = "slic",
+
+ .base_reg = REG_SPI_CLK_FREQ_SEL,
+ .base_bits = 1,
+ .base_shift = 0,
+ .base_values = slic_base,
+ .n_base_values = ARRAY_SIZE(slic_base),
+
+ .div_reg = REG_SPI_CLK_DIV_SEL,
+ .div_bits = 5,
+ .div_shift = 24,
+ .div_val0 = 20,
+ .div_step = 2,
+ },
+ [EN7523_CLK_SPI] = {
+ .id = EN7523_CLK_SPI,
+ .name = "spi",
+
+ .base_reg = REG_SPI_CLK_DIV_SEL,
+
+ .base_value = 400000000,
+
+ .div_bits = 5,
+ .div_shift = 8,
+ .div_val0 = 40,
+ .div_step = 2,
+ },
+ [EN7523_CLK_NPU] = {
+ .id = EN7523_CLK_NPU,
+ .name = "npu",
+
+ .base_reg = REG_NPU_CLK_DIV_SEL,
+ .base_bits = 2,
+ .base_shift = 8,
+ .base_values = npu7581_base,
+ .n_base_values = ARRAY_SIZE(npu7581_base),
+
+ .div_bits = 3,
+ .div_shift = 0,
+ .div_step = 1,
+ .div_offset = 1,
+ },
+ [EN7523_CLK_CRYPTO] = {
+ .id = EN7523_CLK_CRYPTO,
+ .name = "crypto",
+
+ .base_reg = REG_CRYPTO_CLKSRC2,
+ .base_bits = 1,
+ .base_shift = 0,
+ .base_values = crypto_base,
+ .n_base_values = ARRAY_SIZE(crypto_base),
+ },
+ [EN7581_CLK_EMMC] = {
+ .id = EN7581_CLK_EMMC,
+ .name = "emmc",
+
+ .base_reg = REG_CRYPTO_CLKSRC2,
+ .base_bits = 1,
+ .base_shift = 12,
+ .base_values = emmc7581_base,
+ .n_base_values = ARRAY_SIZE(emmc7581_base),
+ }
+};
+
+static u32 airoha_clk_get_base_rate(const struct airoha_clk_desc *desc, u32 val)
+{
+ if (!desc->base_bits)
+ return desc->base_value;
+
+ val >>= desc->base_shift;
+ val &= (1 << desc->base_bits) - 1;
+
+ if (val >= desc->n_base_values)
+ return 0;
+
+ return desc->base_values[val];
+}
+
+static u32 airoha_clk_get_div(const struct airoha_clk_desc *desc, u32 val)
+{
+ if (!desc->div_bits)
+ return 1;
+
+ val >>= desc->div_shift;
+ val &= (1 << desc->div_bits) - 1;
+
+ if (!val && desc->div_val0)
+ return desc->div_val0;
+
+ return (val + desc->div_offset) * desc->div_step;
+}
+
+static int airoha_clk_enable(struct clk *clk)
+{
+ struct airoha_clk_priv *priv = dev_get_priv(clk->dev);
+ struct airoha_clk_soc_data *data = priv->data;
+ int id = clk->id;
+
+ if (id > data->num_clocks)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int airoha_clk_disable(struct clk *clk)
+{
+ return 0;
+}
+
+static ulong airoha_clk_get_rate(struct clk *clk)
+{
+ struct airoha_clk_priv *priv = dev_get_priv(clk->dev);
+ struct airoha_clk_soc_data *data = priv->data;
+ const struct airoha_clk_desc *desc;
+ struct regmap *map = priv->chip_scu_map;
+ int id = clk->id;
+ u32 reg, val;
+ ulong rate;
+ int ret;
+
+ if (id > data->num_clocks) {
+ dev_err(clk->dev, "Invalid clk ID %d\n", id);
+ return 0;
+ }
+
+ desc = &data->descs[id];
+
+ ret = regmap_read(map, desc->base_reg, &val);
+ if (ret) {
+ dev_err(clk->dev, "Failed to read reg for clock %s\n",
+ desc->name);
+ return 0;
+ }
+
+ rate = airoha_clk_get_base_rate(desc, val);
+
+ reg = desc->div_reg ? desc->div_reg : desc->base_reg;
+ ret = regmap_read(map, reg, &val);
+ if (ret) {
+ dev_err(clk->dev, "Failed to read reg for clock %s\n",
+ desc->name);
+ return 0;
+ }
+
+ rate /= airoha_clk_get_div(desc, val);
+
+ return rate;
+}
+
+static int airoha_clk_search_rate(const struct airoha_clk_desc *desc, int div,
+ ulong rate)
+{
+ int i;
+
+ /* Single base rate */
+ if (!desc->base_bits) {
+ if (rate != desc->base_value / div)
+ goto err;
+
+ return 0;
+ }
+
+ /* Check every base rate with provided divisor */
+ for (i = 0; i < desc->n_base_values; i++)
+ if (rate == desc->base_values[i] / div)
+ return i;
+
+err:
+ return -EINVAL;
+}
+
+static ulong airoha_clk_set_rate(struct clk *clk, ulong rate)
+{
+ struct airoha_clk_priv *priv = dev_get_priv(clk->dev);
+ struct airoha_clk_soc_data *data = priv->data;
+ const struct airoha_clk_desc *desc;
+ struct regmap *map = priv->chip_scu_map;
+ int div_val, base_val;
+ u32 reg, val, mask;
+ int id = clk->id;
+ int div;
+ int ret;
+
+ if (id > data->num_clocks) {
+ dev_err(clk->dev, "Invalid clk ID %d\n", id);
+ return 0;
+ }
+
+ desc = &data->descs[id];
+
+ if (!desc->base_bits && !desc->div_bits) {
+ dev_err(clk->dev, "Can't set rate for fixed clock %s\n",
+ desc->name);
+ return 0;
+ }
+
+ if (!desc->div_bits) {
+ /* Divisor not supported, just search in base rate */
+ div_val = 0;
+ base_val = airoha_clk_search_rate(desc, 1, rate);
+ if (base_val < 0) {
+ dev_err(clk->dev, "Invalid rate for clock %s\n",
+ desc->name);
+ return 0;
+ }
+ } else {
+ div_val = 0;
+
+ /* Check if div0 satisfy the request */
+ if (desc->div_val0) {
+ base_val = airoha_clk_search_rate(desc, desc->div_val0,
+ rate);
+ if (base_val >= 0) {
+ div_val = 0;
+ goto apply;
+ }
+
+ /* Skip checking first divisor val */
+ div_val = 1;
+ }
+
+ /* Simulate rate with every divisor supported */
+ for (div_val = div_val + desc->div_offset;
+ div_val < BIT(desc->div_bits) - 1; div_val++) {
+ div = div_val * desc->div_step;
+
+ base_val = airoha_clk_search_rate(desc, div, rate);
+ if (base_val >= 0)
+ break;
+ }
+
+ if (div_val == BIT(desc->div_bits) - 1) {
+ dev_err(clk->dev, "Invalid rate for clock %s\n",
+ desc->name);
+ return 0;
+ }
+ }
+
+apply:
+ if (desc->div_bits) {
+ reg = desc->div_reg ? desc->div_reg : desc->base_reg;
+
+ mask = (BIT(desc->div_bits) - 1) << desc->div_shift;
+ val = div_val << desc->div_shift;
+
+ ret = regmap_update_bits(map, reg, mask, val);
+ if (ret) {
+ dev_err(clk->dev, "Failed to update div reg for clock %s\n",
+ desc->name);
+ return 0;
+ }
+ }
+
+ if (desc->base_bits) {
+ mask = (BIT(desc->base_bits) - 1) << desc->base_shift;
+ val = base_val << desc->base_shift;
+
+ ret = regmap_update_bits(map, desc->base_reg, mask, val);
+ if (ret) {
+ dev_err(clk->dev, "Failed to update reg for clock %s\n",
+ desc->name);
+ return 0;
+ }
+ }
+
+ return rate;
+}
+
+const struct clk_ops airoha_clk_ops = {
+ .enable = airoha_clk_enable,
+ .disable = airoha_clk_disable,
+ .get_rate = airoha_clk_get_rate,
+ .set_rate = airoha_clk_set_rate,
+};
+
+static int airoha_clk_probe(struct udevice *dev)
+{
+ struct airoha_clk_priv *priv = dev_get_priv(dev);
+ ofnode chip_scu_node;
+
+ chip_scu_node = ofnode_by_compatible(ofnode_null(),
+ "airoha,en7581-chip-scu");
+ if (!ofnode_valid(chip_scu_node))
+ return -EINVAL;
+
+ priv->chip_scu_map = syscon_node_to_regmap(chip_scu_node);
+ if (IS_ERR(priv->chip_scu_map))
+ return PTR_ERR(priv->chip_scu_map);
+
+ priv->data = (void *)dev_get_driver_data(dev);
+
+ return 0;
+}
+
+static const struct airoha_clk_soc_data en7581_data = {
+ .num_clocks = ARRAY_SIZE(en7581_base_clks),
+ .descs = en7581_base_clks,
+};
+
+static const struct udevice_id airoha_clk_ids[] = {
+ { .compatible = "airoha,en7581-scu",
+ .data = (ulong)&en7581_data,
+ },
+ { }
+};
+
+U_BOOT_DRIVER(airoha_clk) = {
+ .name = "clk-airoha",
+ .id = UCLASS_CLK,
+ .of_match = airoha_clk_ids,
+ .probe = airoha_clk_probe,
+ .priv_auto = sizeof(struct airoha_clk_priv),
+ .ops = &airoha_clk_ops,
+};
diff --git a/include/dt-bindings/clock/en7523-clk.h b/include/dt-bindings/clock/en7523-clk.h
new file mode 100644
index 00000000000..edfa64045f5
--- /dev/null
+++ b/include/dt-bindings/clock/en7523-clk.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+
+#ifndef _DT_BINDINGS_CLOCK_AIROHA_EN7523_H_
+#define _DT_BINDINGS_CLOCK_AIROHA_EN7523_H_
+
+#define EN7523_CLK_GSW 0
+#define EN7523_CLK_EMI 1
+#define EN7523_CLK_BUS 2
+#define EN7523_CLK_SLIC 3
+#define EN7523_CLK_SPI 4
+#define EN7523_CLK_NPU 5
+#define EN7523_CLK_CRYPTO 6
+#define EN7523_CLK_PCIE 7
+
+#define EN7581_CLK_EMMC 8
+
+#endif /* _DT_BINDINGS_CLOCK_AIROHA_EN7523_H_ */
--
2.48.1
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