1 files changed, 303 insertions, 0 deletions

diff --git a/drivers/clk/clk-lochnagar.c b/drivers/clk/clk-lochnagar.c
new file mode 100644
index 000000000..80944bf48
--- /dev/null
+++ b/drivers/clk/clk-lochnagar.c
@@ -0,0 +1,303 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Lochnagar clock control
+ *
+ * Copyright (c) 2017-2018 Cirrus Logic, Inc. and
+ *                         Cirrus Logic International Semiconductor Ltd.
+ *
+ * Author: Charles Keepax <ckeepax@opensource.cirrus.com>
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include <linux/mfd/lochnagar1_regs.h>
+#include <linux/mfd/lochnagar2_regs.h>
+
+#include <dt-bindings/clock/lochnagar.h>
+
+#define LOCHNAGAR_NUM_CLOCKS	(LOCHNAGAR_SPDIF_CLKOUT + 1)
+
+struct lochnagar_clk {
+	const char * const name;
+	struct clk_hw hw;
+
+	struct lochnagar_clk_priv *priv;
+
+	u16 cfg_reg;
+	u16 ena_mask;
+
+	u16 src_reg;
+	u16 src_mask;
+};
+
+struct lochnagar_clk_priv {
+	struct device *dev;
+	struct regmap *regmap;
+
+	struct lochnagar_clk lclks[LOCHNAGAR_NUM_CLOCKS];
+};
+
+#define LN_PARENT(NAME) { .name = NAME, .fw_name = NAME }
+
+static const struct clk_parent_data lochnagar1_clk_parents[] = {
+	LN_PARENT("ln-none"),
+	LN_PARENT("ln-spdif-mclk"),
+	LN_PARENT("ln-psia1-mclk"),
+	LN_PARENT("ln-psia2-mclk"),
+	LN_PARENT("ln-cdc-clkout"),
+	LN_PARENT("ln-dsp-clkout"),
+	LN_PARENT("ln-pmic-32k"),
+	LN_PARENT("ln-gf-mclk1"),
+	LN_PARENT("ln-gf-mclk3"),
+	LN_PARENT("ln-gf-mclk2"),
+	LN_PARENT("ln-gf-mclk4"),
+};
+
+static const struct clk_parent_data lochnagar2_clk_parents[] = {
+	LN_PARENT("ln-none"),
+	LN_PARENT("ln-cdc-clkout"),
+	LN_PARENT("ln-dsp-clkout"),
+	LN_PARENT("ln-pmic-32k"),
+	LN_PARENT("ln-spdif-mclk"),
+	LN_PARENT("ln-clk-12m"),
+	LN_PARENT("ln-clk-11m"),
+	LN_PARENT("ln-clk-24m"),
+	LN_PARENT("ln-clk-22m"),
+	LN_PARENT("ln-clk-8m"),
+	LN_PARENT("ln-usb-clk-24m"),
+	LN_PARENT("ln-gf-mclk1"),
+	LN_PARENT("ln-gf-mclk3"),
+	LN_PARENT("ln-gf-mclk2"),
+	LN_PARENT("ln-psia1-mclk"),
+	LN_PARENT("ln-psia2-mclk"),
+	LN_PARENT("ln-spdif-clkout"),
+	LN_PARENT("ln-adat-mclk"),
+	LN_PARENT("ln-usb-clk-12m"),
+};
+
+#define LN1_CLK(ID, NAME, REG) \
+	[LOCHNAGAR_##ID] = { \
+		.name = NAME, \
+		.cfg_reg = LOCHNAGAR1_##REG, \
+		.ena_mask = LOCHNAGAR1_##ID##_ENA_MASK, \
+		.src_reg = LOCHNAGAR1_##ID##_SEL, \
+		.src_mask = LOCHNAGAR1_SRC_MASK, \
+	}
+
+#define LN2_CLK(ID, NAME) \
+	[LOCHNAGAR_##ID] = { \
+		.name = NAME, \
+		.cfg_reg = LOCHNAGAR2_##ID##_CTRL, \
+		.src_reg = LOCHNAGAR2_##ID##_CTRL, \
+		.ena_mask = LOCHNAGAR2_CLK_ENA_MASK, \
+		.src_mask = LOCHNAGAR2_CLK_SRC_MASK, \
+	}
+
+static const struct lochnagar_clk lochnagar1_clks[LOCHNAGAR_NUM_CLOCKS] = {
+	LN1_CLK(CDC_MCLK1,      "ln-cdc-mclk1",  CDC_AIF_CTRL2),
+	LN1_CLK(CDC_MCLK2,      "ln-cdc-mclk2",  CDC_AIF_CTRL2),
+	LN1_CLK(DSP_CLKIN,      "ln-dsp-clkin",  DSP_AIF),
+	LN1_CLK(GF_CLKOUT1,     "ln-gf-clkout1", GF_AIF1),
+};
+
+static const struct lochnagar_clk lochnagar2_clks[LOCHNAGAR_NUM_CLOCKS] = {
+	LN2_CLK(CDC_MCLK1,      "ln-cdc-mclk1"),
+	LN2_CLK(CDC_MCLK2,      "ln-cdc-mclk2"),
+	LN2_CLK(DSP_CLKIN,      "ln-dsp-clkin"),
+	LN2_CLK(GF_CLKOUT1,     "ln-gf-clkout1"),
+	LN2_CLK(GF_CLKOUT2,     "ln-gf-clkout2"),
+	LN2_CLK(PSIA1_MCLK,     "ln-psia1-mclk"),
+	LN2_CLK(PSIA2_MCLK,     "ln-psia2-mclk"),
+	LN2_CLK(SPDIF_MCLK,     "ln-spdif-mclk"),
+	LN2_CLK(ADAT_MCLK,      "ln-adat-mclk"),
+	LN2_CLK(SOUNDCARD_MCLK, "ln-soundcard-mclk"),
+};
+
+struct lochnagar_config {
+	const struct clk_parent_data *parents;
+	int nparents;
+	const struct lochnagar_clk *clks;
+};
+
+static const struct lochnagar_config lochnagar1_conf = {
+	.parents = lochnagar1_clk_parents,
+	.nparents = ARRAY_SIZE(lochnagar1_clk_parents),
+	.clks = lochnagar1_clks,
+};
+
+static const struct lochnagar_config lochnagar2_conf = {
+	.parents = lochnagar2_clk_parents,
+	.nparents = ARRAY_SIZE(lochnagar2_clk_parents),
+	.clks = lochnagar2_clks,
+};
+
+static inline struct lochnagar_clk *lochnagar_hw_to_lclk(struct clk_hw *hw)
+{
+	return container_of(hw, struct lochnagar_clk, hw);
+}
+
+static int lochnagar_clk_prepare(struct clk_hw *hw)
+{
+	struct lochnagar_clk *lclk = lochnagar_hw_to_lclk(hw);
+	struct lochnagar_clk_priv *priv = lclk->priv;
+	struct regmap *regmap = priv->regmap;
+	int ret;
+
+	ret = regmap_update_bits(regmap, lclk->cfg_reg,
+				 lclk->ena_mask, lclk->ena_mask);
+	if (ret < 0)
+		dev_dbg(priv->dev, "Failed to prepare %s: %d\n",
+			lclk->name, ret);
+
+	return ret;
+}
+
+static void lochnagar_clk_unprepare(struct clk_hw *hw)
+{
+	struct lochnagar_clk *lclk = lochnagar_hw_to_lclk(hw);
+	struct lochnagar_clk_priv *priv = lclk->priv;
+	struct regmap *regmap = priv->regmap;
+	int ret;
+
+	ret = regmap_update_bits(regmap, lclk->cfg_reg, lclk->ena_mask, 0);
+	if (ret < 0)
+		dev_dbg(priv->dev, "Failed to unprepare %s: %d\n",
+			lclk->name, ret);
+}
+
+static int lochnagar_clk_set_parent(struct clk_hw *hw, u8 index)
+{
+	struct lochnagar_clk *lclk = lochnagar_hw_to_lclk(hw);
+	struct lochnagar_clk_priv *priv = lclk->priv;
+	struct regmap *regmap = priv->regmap;
+	int ret;
+
+	ret = regmap_update_bits(regmap, lclk->src_reg, lclk->src_mask, index);
+	if (ret < 0)
+		dev_dbg(priv->dev, "Failed to reparent %s: %d\n",
+			lclk->name, ret);
+
+	return ret;
+}
+
+static u8 lochnagar_clk_get_parent(struct clk_hw *hw)
+{
+	struct lochnagar_clk *lclk = lochnagar_hw_to_lclk(hw);
+	struct lochnagar_clk_priv *priv = lclk->priv;
+	struct regmap *regmap = priv->regmap;
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(regmap, lclk->src_reg, &val);
+	if (ret < 0) {
+		dev_dbg(priv->dev, "Failed to read parent of %s: %d\n",
+			lclk->name, ret);
+		return clk_hw_get_num_parents(hw);
+	}
+
+	val &= lclk->src_mask;
+
+	return val;
+}
+
+static const struct clk_ops lochnagar_clk_ops = {
+	.prepare = lochnagar_clk_prepare,
+	.unprepare = lochnagar_clk_unprepare,
+	.set_parent = lochnagar_clk_set_parent,
+	.get_parent = lochnagar_clk_get_parent,
+};
+
+static struct clk_hw *
+lochnagar_of_clk_hw_get(struct of_phandle_args *clkspec, void *data)
+{
+	struct lochnagar_clk_priv *priv = data;
+	unsigned int idx = clkspec->args[0];
+
+	if (idx >= ARRAY_SIZE(priv->lclks)) {
+		dev_err(priv->dev, "Invalid index %u\n", idx);
+		return ERR_PTR(-EINVAL);
+	}
+
+	return &priv->lclks[idx].hw;
+}
+
+static const struct of_device_id lochnagar_of_match[] = {
+	{ .compatible = "cirrus,lochnagar1-clk", .data = &lochnagar1_conf },
+	{ .compatible = "cirrus,lochnagar2-clk", .data = &lochnagar2_conf },
+	{}
+};
+MODULE_DEVICE_TABLE(of, lochnagar_of_match);
+
+static int lochnagar_clk_probe(struct platform_device *pdev)
+{
+	struct clk_init_data clk_init = {
+		.ops = &lochnagar_clk_ops,
+	};
+	struct device *dev = &pdev->dev;
+	struct lochnagar_clk_priv *priv;
+	const struct of_device_id *of_id;
+	struct lochnagar_clk *lclk;
+	struct lochnagar_config *conf;
+	int ret, i;
+
+	of_id = of_match_device(lochnagar_of_match, dev);
+	if (!of_id)
+		return -EINVAL;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->dev = dev;
+	priv->regmap = dev_get_regmap(dev->parent, NULL);
+	conf = (struct lochnagar_config *)of_id->data;
+
+	memcpy(priv->lclks, conf->clks, sizeof(priv->lclks));
+
+	clk_init.parent_data = conf->parents;
+	clk_init.num_parents = conf->nparents;
+
+	for (i = 0; i < ARRAY_SIZE(priv->lclks); i++) {
+		lclk = &priv->lclks[i];
+
+		if (!lclk->name)
+			continue;
+
+		clk_init.name = lclk->name;
+
+		lclk->priv = priv;
+		lclk->hw.init = &clk_init;
+
+		ret = devm_clk_hw_register(dev, &lclk->hw);
+		if (ret) {
+			dev_err(dev, "Failed to register %s: %d\n",
+				lclk->name, ret);
+			return ret;
+		}
+	}
+
+	ret = devm_of_clk_add_hw_provider(dev, lochnagar_of_clk_hw_get, priv);
+	if (ret < 0)
+		dev_err(dev, "Failed to register provider: %d\n", ret);
+
+	return ret;
+}
+
+static struct platform_driver lochnagar_clk_driver = {
+	.driver = {
+		.name = "lochnagar-clk",
+		.of_match_table = lochnagar_of_match,
+	},
+	.probe = lochnagar_clk_probe,
+};
+module_platform_driver(lochnagar_clk_driver);
+
+MODULE_AUTHOR("Charles Keepax <ckeepax@opensource.cirrus.com>");
+MODULE_DESCRIPTION("Clock driver for Cirrus Logic Lochnagar Board");
+MODULE_LICENSE("GPL v2");