[PATCH v1 21/30] clk: starfive: Add StarFive JH7110 always-on clock driver
Hal Feng
hal.feng at linux.starfivetech.com
Thu Sep 29 23:03:16 PDT 2022
From: Emil Renner Berthing <kernel at esmil.dk>
Add driver for the StarFive JH7110 always-on clock controller.
Signed-off-by: Emil Renner Berthing <kernel at esmil.dk>
Signed-off-by: Hal Feng <hal.feng at linux.starfivetech.com>
---
drivers/clk/starfive/Kconfig | 9 +
drivers/clk/starfive/Makefile | 1 +
.../clk/starfive/clk-starfive-jh7110-aon.c | 161 ++++++++++++++++++
3 files changed, 171 insertions(+)
create mode 100644 drivers/clk/starfive/clk-starfive-jh7110-aon.c
diff --git a/drivers/clk/starfive/Kconfig b/drivers/clk/starfive/Kconfig
index c13096543a8b..42aad3b553cb 100644
--- a/drivers/clk/starfive/Kconfig
+++ b/drivers/clk/starfive/Kconfig
@@ -29,3 +29,12 @@ config CLK_STARFIVE_JH7110_SYS
help
Say yes here to support the system clock controller on the
StarFive JH7110 SoC.
+
+config CLK_STARFIVE_JH7110_AON
+ tristate "StarFive JH7110 always-on clock support"
+ depends on SOC_STARFIVE || COMPILE_TEST
+ select CLK_STARFIVE
+ default m if SOC_STARFIVE
+ help
+ Say yes here to support the always-on clock controller on the
+ StarFive JH7110 SoC.
diff --git a/drivers/clk/starfive/Makefile b/drivers/clk/starfive/Makefile
index 2bc126cc91f2..b54d11340704 100644
--- a/drivers/clk/starfive/Makefile
+++ b/drivers/clk/starfive/Makefile
@@ -5,3 +5,4 @@ obj-$(CONFIG_CLK_STARFIVE_JH7100) += clk-starfive-jh7100.o
obj-$(CONFIG_CLK_STARFIVE_JH7100_AUDIO) += clk-starfive-jh7100-audio.o
obj-$(CONFIG_CLK_STARFIVE_JH7110_SYS) += clk-starfive-jh7110-sys.o
+obj-$(CONFIG_CLK_STARFIVE_JH7110_AON) += clk-starfive-jh7110-aon.o
diff --git a/drivers/clk/starfive/clk-starfive-jh7110-aon.c b/drivers/clk/starfive/clk-starfive-jh7110-aon.c
new file mode 100644
index 000000000000..4975e7ad67be
--- /dev/null
+++ b/drivers/clk/starfive/clk-starfive-jh7110-aon.c
@@ -0,0 +1,161 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * StarFive JH7110 Always-On Clock Driver
+ *
+ * Copyright (C) 2022 Emil Renner Berthing <kernel at esmil.dk>
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+#include <dt-bindings/clock/starfive-jh7110-aon.h>
+
+#include "clk-starfive.h"
+
+/* external clocks */
+#define JH7110_AONCLK_OSC (JH7110_AONCLK_END + 0)
+#define JH7110_AONCLK_RTC (JH7110_AONCLK_END + 1)
+#define JH7110_AONCLK_GMAC0_RMII_REFIN (JH7110_AONCLK_END + 2)
+#define JH7110_AONCLK_GMAC0_RGMII_RXIN (JH7110_AONCLK_END + 3)
+#define JH7110_AONCLK_STG_AXIAHB (JH7110_AONCLK_END + 4)
+#define JH7110_AONCLK_APB_BUS_FUNC (JH7110_AONCLK_END + 5)
+#define JH7110_AONCLK_GMAC0_GTXCLK (JH7110_AONCLK_END + 6)
+
+static const struct starfive_clk_data jh7110_aonclk_data[] = {
+ /* source */
+ STARFIVE__DIV(JH7110_AONCLK_OSC_DIV4, "osc_div4", 4,
+ JH7110_AONCLK_OSC),
+ STARFIVE__MUX(JH7110_AONCLK_APB_FUNC, "aon_apb_func", 2,
+ JH7110_AONCLK_OSC_DIV4,
+ JH7110_AONCLK_OSC),
+ /* gmac0 */
+ STARFIVE_GATE(JH7110_AONCLK_GMAC0_AHB, "gmac0_ahb", 0,
+ JH7110_AONCLK_STG_AXIAHB),
+ STARFIVE_GATE(JH7110_AONCLK_GMAC0_AXI, "gmac0_axi", 0,
+ JH7110_AONCLK_STG_AXIAHB),
+ STARFIVE__DIV(JH7110_AONCLK_GMAC0_RMII_RTX, "gmac0_rmii_rtx", 30,
+ JH7110_AONCLK_GMAC0_RMII_REFIN),
+ STARFIVE_GMUX(JH7110_AONCLK_GMAC0_TX, "gmac0_tx", 0, 2,
+ JH7110_AONCLK_GMAC0_GTXCLK,
+ JH7110_AONCLK_GMAC0_RMII_RTX),
+ STARFIVE__INV(JH7110_AONCLK_GMAC0_TX_INV, "gmac0_tx_inv",
+ JH7110_AONCLK_GMAC0_TX),
+ STARFIVE__MUX(JH7110_AONCLK_GMAC0_RX, "gmac0_rx", 2,
+ JH7110_AONCLK_GMAC0_RGMII_RXIN,
+ JH7110_AONCLK_GMAC0_RMII_RTX),
+ STARFIVE__INV(JH7110_AONCLK_GMAC0_RX_INV, "gmac0_rx_inv",
+ JH7110_AONCLK_GMAC0_RX),
+ /* otpc */
+ STARFIVE_GATE(JH7110_AONCLK_OTPC_APB, "otpc_apb", CLK_IGNORE_UNUSED,
+ JH7110_AONCLK_APB_BUS_FUNC),
+ /* rtc */
+ STARFIVE_GATE(JH7110_AONCLK_RTC_APB, "rtc_apb", CLK_IGNORE_UNUSED,
+ JH7110_AONCLK_APB_BUS_FUNC),
+ STARFIVE__DIV(JH7110_AONCLK_RTC_INTERNAL, "rtc_internal", 1022,
+ JH7110_AONCLK_OSC),
+ STARFIVE__MUX(JH7110_AONCLK_RTC_32K, "rtc_32k", 2,
+ JH7110_AONCLK_RTC,
+ JH7110_AONCLK_RTC_INTERNAL),
+ STARFIVE_GATE(JH7110_AONCLK_RTC_CAL, "rtc_cal", 0,
+ JH7110_AONCLK_OSC),
+};
+
+static struct clk_hw *jh7110_aonclk_get(struct of_phandle_args *clkspec, void *data)
+{
+ struct starfive_clk_priv *priv = data;
+ unsigned int idx = clkspec->args[0];
+
+ if (idx < JH7110_AONCLK_END)
+ return &priv->reg[idx].hw;
+
+ return ERR_PTR(-EINVAL);
+}
+
+static int jh7110_aoncrg_probe(struct platform_device *pdev)
+{
+ struct starfive_clk_priv *priv;
+ unsigned int idx;
+ int ret;
+
+ priv = devm_kzalloc(&pdev->dev,
+ struct_size(priv, reg, JH7110_AONCLK_END),
+ GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->dev = &pdev->dev;
+
+ priv->regmap = syscon_node_to_regmap(priv->dev->of_node->parent);
+ if (IS_ERR(priv->regmap)) {
+ dev_err(priv->dev, "failed to get regmap (error %ld)\n",
+ PTR_ERR(priv->regmap));
+ return PTR_ERR(priv->regmap);
+ }
+
+ for (idx = 0; idx < JH7110_AONCLK_END; idx++) {
+ u32 max = jh7110_aonclk_data[idx].max;
+ struct clk_parent_data parents[4] = {};
+ struct clk_init_data init = {
+ .name = jh7110_aonclk_data[idx].name,
+ .ops = starfive_clk_ops(max),
+ .parent_data = parents,
+ .num_parents = ((max & STARFIVE_CLK_MUX_MASK)
+ >> STARFIVE_CLK_MUX_SHIFT) + 1,
+ .flags = jh7110_aonclk_data[idx].flags,
+ };
+ struct starfive_clk *clk = &priv->reg[idx];
+ unsigned int i;
+
+ for (i = 0; i < init.num_parents; i++) {
+ unsigned int pidx = jh7110_aonclk_data[idx].parents[i];
+
+ if (pidx < JH7110_AONCLK_END)
+ parents[i].hw = &priv->reg[pidx].hw;
+ else if (pidx == JH7110_AONCLK_OSC)
+ parents[i].fw_name = "osc";
+ else if (pidx == JH7110_AONCLK_RTC)
+ parents[i].fw_name = "clk_rtc";
+ else if (pidx == JH7110_AONCLK_GMAC0_RMII_REFIN)
+ parents[i].fw_name = "gmac0_rmii_refin";
+ else if (pidx == JH7110_AONCLK_GMAC0_RGMII_RXIN)
+ parents[i].fw_name = "gmac0_rgmii_rxin";
+ else if (pidx == JH7110_AONCLK_STG_AXIAHB)
+ parents[i].fw_name = "stg_axiahb";
+ else if (pidx == JH7110_AONCLK_APB_BUS_FUNC)
+ parents[i].fw_name = "apb_bus_func";
+ }
+
+ clk->hw.init = &init;
+ clk->idx = idx;
+ clk->max_div = max & STARFIVE_CLK_DIV_MASK;
+
+ ret = devm_clk_hw_register(&pdev->dev, &clk->hw);
+ if (ret)
+ return ret;
+ }
+
+ return devm_of_clk_add_hw_provider(&pdev->dev, jh7110_aonclk_get, priv);
+}
+
+static const struct of_device_id jh7110_aoncrg_match[] = {
+ { .compatible = "starfive,jh7110-clkgen-aon" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, jh7110_aoncrg_match);
+
+static struct platform_driver jh7110_aoncrg_driver = {
+ .probe = jh7110_aoncrg_probe,
+ .driver = {
+ .name = "clk-starfive-jh7110-aon",
+ .of_match_table = jh7110_aoncrg_match,
+ },
+};
+module_platform_driver(jh7110_aoncrg_driver);
+
+MODULE_AUTHOR("Emil Renner Berthing");
+MODULE_DESCRIPTION("StarFive JH7110 always-on clock driver");
+MODULE_LICENSE("GPL v2");
--
2.17.1
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