1 files changed, 184 insertions, 43 deletions

diff --git a/drivers/clk/microchip/clk-mpfs.c b/drivers/clk/microchip/clk-mpfs.c
index c22632a7439c..ee58304913ef 100644
--- a/drivers/clk/microchip/clk-mpfs.c
+++ b/drivers/clk/microchip/clk-mpfs.c
@@ -4,10 +4,13 @@
  *
  * Copyright (C) 2020-2022 Microchip Technology Inc. All rights reserved.
  */
+#include <linux/cleanup.h>
 #include <linux/clk-provider.h>
 #include <linux/io.h>
+#include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/regmap.h>
 #include <dt-bindings/clock/microchip,mpfs-clock.h>
 #include <soc/microchip/mpfs.h>
 
@@ -30,6 +33,14 @@
 #define MSSPLL_POSTDIV_WIDTH	0x07u
 #define MSSPLL_FIXED_DIV	4u
 
+static const struct regmap_config mpfs_clk_regmap_config = {
+	.reg_bits = 32,
+	.reg_stride = 4,
+	.val_bits = 32,
+	.val_format_endian = REGMAP_ENDIAN_LITTLE,
+	.max_register = REG_SUBBLK_RESET_CR,
+};
+
 /*
  * This clock ID is defined here, rather than the binding headers, as it is an
  * internal clock only, and therefore has no consumers in other peripheral
@@ -39,6 +50,7 @@
 
 struct mpfs_clock_data {
 	struct device *dev;
+	struct regmap *regmap;
 	void __iomem *base;
 	void __iomem *msspll_base;
 	struct clk_hw_onecell_data hw_data;
@@ -67,21 +79,39 @@ struct mpfs_msspll_out_hw_clock {
 
 #define to_mpfs_msspll_out_clk(_hw) container_of(_hw, struct mpfs_msspll_out_hw_clock, hw)
 
+struct mpfs_cfg_clock {
+	struct regmap *map;
+	const struct clk_div_table *table;
+	u8 map_offset;
+	u8 shift;
+	u8 width;
+	u8 flags;
+};
+
 struct mpfs_cfg_hw_clock {
-	struct clk_divider cfg;
-	struct clk_init_data init;
+	struct clk_hw hw;
+	struct mpfs_cfg_clock cfg;
 	unsigned int id;
-	u32 reg_offset;
+};
+
+#define to_mpfs_cfg_clk(_hw) container_of(_hw, struct mpfs_cfg_hw_clock, hw)
+
+struct mpfs_periph_clock {
+	struct regmap *map;
+	u8 map_offset;
+	u8 shift;
 };
 
 struct mpfs_periph_hw_clock {
-	struct clk_gate periph;
+	struct clk_hw hw;
+	struct mpfs_periph_clock periph;
 	unsigned int id;
 };
 
+#define to_mpfs_periph_clk(_hw) container_of(_hw, struct mpfs_periph_hw_clock, hw)
+
 /*
- * mpfs_clk_lock prevents anything else from writing to the
- * mpfs clk block while a software locked register is being written.
+ * Protects MSSPLL outputs, since there's two to a register
  */
 static DEFINE_SPINLOCK(mpfs_clk_lock);
 
@@ -219,16 +249,61 @@ static int mpfs_clk_register_msspll_outs(struct device *dev,
 /*
  * "CFG" clocks
  */
+static unsigned long mpfs_cfg_clk_recalc_rate(struct clk_hw *hw, unsigned long prate)
+{
+	struct mpfs_cfg_hw_clock *cfg_hw = to_mpfs_cfg_clk(hw);
+	struct mpfs_cfg_clock *cfg = &cfg_hw->cfg;
+	u32 val;
 
-#define CLK_CFG(_id, _name, _parent, _shift, _width, _table, _flags, _offset) {		\
-	.id = _id,									\
-	.cfg.shift = _shift,								\
-	.cfg.width = _width,								\
-	.cfg.table = _table,								\
-	.reg_offset = _offset,								\
-	.cfg.flags = _flags,								\
-	.cfg.hw.init = CLK_HW_INIT(_name, _parent, &clk_divider_ops, 0),		\
-	.cfg.lock = &mpfs_clk_lock,							\
+	regmap_read(cfg->map, cfg->map_offset, &val);
+	val >>= cfg->shift;
+	val &= clk_div_mask(cfg->width);
+
+	return divider_recalc_rate(hw, prate, val, cfg->table, cfg->flags, cfg->width);
+}
+
+static int mpfs_cfg_clk_determine_rate(struct clk_hw *hw, struct clk_rate_request *req)
+{
+	struct mpfs_cfg_hw_clock *cfg_hw = to_mpfs_cfg_clk(hw);
+	struct mpfs_cfg_clock *cfg = &cfg_hw->cfg;
+
+	return divider_determine_rate(hw, req, cfg->table, cfg->width, 0);
+}
+
+static int mpfs_cfg_clk_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long prate)
+{
+	struct mpfs_cfg_hw_clock *cfg_hw = to_mpfs_cfg_clk(hw);
+	struct mpfs_cfg_clock *cfg = &cfg_hw->cfg;
+	int divider_setting;
+	u32 val;
+	u32 mask;
+
+	divider_setting = divider_get_val(rate, prate, cfg->table, cfg->width, 0);
+
+	if (divider_setting < 0)
+		return divider_setting;
+
+	mask = clk_div_mask(cfg->width) << cfg->shift;
+	val = divider_setting << cfg->shift;
+	regmap_update_bits(cfg->map, cfg->map_offset, val, mask);
+
+	return 0;
+}
+
+static const struct clk_ops mpfs_clk_cfg_ops = {
+	.recalc_rate = mpfs_cfg_clk_recalc_rate,
+	.determine_rate = mpfs_cfg_clk_determine_rate,
+	.set_rate = mpfs_cfg_clk_set_rate,
+};
+
+#define CLK_CFG(_id, _name, _parent, _shift, _width, _table, _flags, _offset) {	\
+	.id = _id,								\
+	.cfg.shift = _shift,							\
+	.cfg.width = _width,							\
+	.cfg.table = _table,							\
+	.cfg.map_offset = _offset,						\
+	.cfg.flags = _flags,							\
+	.hw.init = CLK_HW_INIT(_name, _parent, &mpfs_clk_cfg_ops, 0),		\
 }
 
 #define CLK_CPU_OFFSET		0u
@@ -248,10 +323,10 @@ static struct mpfs_cfg_hw_clock mpfs_cfg_clks[] = {
 		.cfg.shift = 0,
 		.cfg.width = 12,
 		.cfg.table = mpfs_div_rtcref_table,
-		.reg_offset = REG_RTC_CLOCK_CR,
+		.cfg.map_offset = REG_RTC_CLOCK_CR,
 		.cfg.flags = CLK_DIVIDER_ONE_BASED,
-		.cfg.hw.init =
-			CLK_HW_INIT_PARENTS_DATA("clk_rtcref", mpfs_ext_ref, &clk_divider_ops, 0),
+		.hw.init =
+			CLK_HW_INIT_PARENTS_DATA("clk_rtcref", mpfs_ext_ref, &mpfs_clk_cfg_ops, 0),
 	}
 };
 
@@ -264,14 +339,14 @@ static int mpfs_clk_register_cfgs(struct device *dev, struct mpfs_cfg_hw_clock *
 	for (i = 0; i < num_clks; i++) {
 		struct mpfs_cfg_hw_clock *cfg_hw = &cfg_hws[i];
 
-		cfg_hw->cfg.reg = data->base + cfg_hw->reg_offset;
-		ret = devm_clk_hw_register(dev, &cfg_hw->cfg.hw);
+		cfg_hw->cfg.map = data->regmap;
+		ret = devm_clk_hw_register(dev, &cfg_hw->hw);
 		if (ret)
 			return dev_err_probe(dev, ret, "failed to register clock id: %d\n",
 					     cfg_hw->id);
 
 		id = cfg_hw->id;
-		data->hw_data.hws[id] = &cfg_hw->cfg.hw;
+		data->hw_data.hws[id] = &cfg_hw->hw;
 	}
 
 	return 0;
@@ -281,15 +356,50 @@ static int mpfs_clk_register_cfgs(struct device *dev, struct mpfs_cfg_hw_clock *
  * peripheral clocks - devices connected to axi or ahb buses.
  */
 
-#define CLK_PERIPH(_id, _name, _parent, _shift, _flags) {			\
-	.id = _id,								\
-	.periph.bit_idx = _shift,						\
-	.periph.hw.init = CLK_HW_INIT_HW(_name, _parent, &clk_gate_ops,		\
-				  _flags),					\
-	.periph.lock = &mpfs_clk_lock,						\
+static int mpfs_periph_clk_enable(struct clk_hw *hw)
+{
+	struct mpfs_periph_hw_clock *periph_hw = to_mpfs_periph_clk(hw);
+	struct mpfs_periph_clock *periph = &periph_hw->periph;
+
+	regmap_update_bits(periph->map, periph->map_offset,
+			   BIT(periph->shift), BIT(periph->shift));
+
+	return 0;
 }
 
-#define PARENT_CLK(PARENT) (&mpfs_cfg_clks[CLK_##PARENT##_OFFSET].cfg.hw)
+static void mpfs_periph_clk_disable(struct clk_hw *hw)
+{
+	struct mpfs_periph_hw_clock *periph_hw = to_mpfs_periph_clk(hw);
+	struct mpfs_periph_clock *periph = &periph_hw->periph;
+
+	regmap_update_bits(periph->map, periph->map_offset, BIT(periph->shift), 0);
+}
+
+static int mpfs_periph_clk_is_enabled(struct clk_hw *hw)
+{
+	struct mpfs_periph_hw_clock *periph_hw = to_mpfs_periph_clk(hw);
+	struct mpfs_periph_clock *periph = &periph_hw->periph;
+	u32 val;
+
+	regmap_read(periph->map, periph->map_offset, &val);
+
+	return !!(val & BIT(periph->shift));
+}
+
+static const struct clk_ops mpfs_periph_clk_ops = {
+	.enable = mpfs_periph_clk_enable,
+	.disable = mpfs_periph_clk_disable,
+	.is_enabled = mpfs_periph_clk_is_enabled,
+};
+
+#define CLK_PERIPH(_id, _name, _parent, _shift, _flags) {				\
+	.id = _id,									\
+	.periph.map_offset = REG_SUBBLK_CLOCK_CR,					\
+	.periph.shift = _shift,								\
+	.hw.init = CLK_HW_INIT_HW(_name, _parent, &mpfs_periph_clk_ops, _flags),	\
+}
+
+#define PARENT_CLK(PARENT) (&mpfs_cfg_clks[CLK_##PARENT##_OFFSET].hw)
 
 /*
  * Critical clocks:
@@ -346,19 +456,55 @@ static int mpfs_clk_register_periphs(struct device *dev, struct mpfs_periph_hw_c
 	for (i = 0; i < num_clks; i++) {
 		struct mpfs_periph_hw_clock *periph_hw = &periph_hws[i];
 
-		periph_hw->periph.reg = data->base + REG_SUBBLK_CLOCK_CR;
-		ret = devm_clk_hw_register(dev, &periph_hw->periph.hw);
+		periph_hw->periph.map = data->regmap;
+		ret = devm_clk_hw_register(dev, &periph_hw->hw);
 		if (ret)
 			return dev_err_probe(dev, ret, "failed to register clock id: %d\n",
 					     periph_hw->id);
 
 		id = periph_hws[i].id;
-		data->hw_data.hws[id] = &periph_hw->periph.hw;
+		data->hw_data.hws[id] = &periph_hw->hw;
 	}
 
 	return 0;
 }
 
+static inline int mpfs_clk_syscon_probe(struct mpfs_clock_data *clk_data,
+					struct platform_device *pdev)
+{
+	clk_data->regmap = syscon_regmap_lookup_by_compatible("microchip,mpfs-mss-top-sysreg");
+	if (IS_ERR(clk_data->regmap))
+		return PTR_ERR(clk_data->regmap);
+
+	clk_data->msspll_base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(clk_data->msspll_base))
+		return PTR_ERR(clk_data->msspll_base);
+
+	return 0;
+}
+
+static inline int mpfs_clk_old_format_probe(struct mpfs_clock_data *clk_data,
+					    struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+
+	dev_warn(&pdev->dev, "falling back to old devicetree format");
+
+	clk_data->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(clk_data->base))
+		return PTR_ERR(clk_data->base);
+
+	clk_data->msspll_base = devm_platform_ioremap_resource(pdev, 1);
+	if (IS_ERR(clk_data->msspll_base))
+		return PTR_ERR(clk_data->msspll_base);
+
+	clk_data->regmap = devm_regmap_init_mmio(dev, clk_data->base, &mpfs_clk_regmap_config);
+	if (IS_ERR(clk_data->regmap))
+		return PTR_ERR(clk_data->regmap);
+
+	return mpfs_reset_controller_register(dev, clk_data->regmap);
+}
+
 static int mpfs_clk_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -374,13 +520,12 @@ static int mpfs_clk_probe(struct platform_device *pdev)
 	if (!clk_data)
 		return -ENOMEM;
 
-	clk_data->base = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(clk_data->base))
-		return PTR_ERR(clk_data->base);
-
-	clk_data->msspll_base = devm_platform_ioremap_resource(pdev, 1);
-	if (IS_ERR(clk_data->msspll_base))
-		return PTR_ERR(clk_data->msspll_base);
+	ret = mpfs_clk_syscon_probe(clk_data, pdev);
+	if (ret) {
+		ret = mpfs_clk_old_format_probe(clk_data, pdev);
+		if (ret)
+			return ret;
+	}
 
 	clk_data->hw_data.num = num_clks;
 	clk_data->dev = dev;
@@ -406,11 +551,7 @@ static int mpfs_clk_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, &clk_data->hw_data);
-	if (ret)
-		return ret;
-
-	return mpfs_reset_controller_register(dev, clk_data->base + REG_SUBBLK_RESET_CR);
+	return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, &clk_data->hw_data);
 }
 
 static const struct of_device_id mpfs_clk_of_match_table[] = {