clk: renesas: rzg2l: Refactor SD mux driver

Refactor SD MUX driver to be able to reuse the same code on RZ/G3S.
RZ/G2{L,UL} has a limitation with regards to switching the clock source
for SD MUX (MUX clock source has to be switched to 266MHz before
switching b/w 533MHz and 400MHz).  Rework the handling of this limitation
to use a clock notifier that is registered according to platform based
initialization data, so the SD MUX code can be reused on RZ/G3S.

As RZ/G2{L,UL} and RZ/G3S use different bits in different registers to
check if the clock switching has been done, this configuration (register
offset, register bits and bitfield width) is now passed through struct
cpg_core_clk::sconf (status configuration) from platform specific
initialization code.

Along with struct cpg_core_clk::sconf the mux table indices are also
passed from platform specific initialization code.

Also, mux flags are now passed to DEF_SD_MUX() as they will be used
later by RZ/G3S.

CPG_WEN_BIT macro has been introduced to select properly the WEN bit
of various registers.

Signed-off-by: Claudiu Beznea <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Geert Uytterhoeven <[email protected]>

Author: claudiubeznea

drivers/clk/renesas/r9a07g043-cpg.c

@@ -21,6 +21,10 @@
 #define SEL_SDHI0		SEL_PLL_PACK(CPG_PL2SDHI_DSEL, 0, 2)
 #define SEL_SDHI1		SEL_PLL_PACK(CPG_PL2SDHI_DSEL, 4, 2)
 
+/* Clock status configuration. */
+#define SEL_SDHI0_STS		SEL_PLL_PACK(CPG_CLKSTATUS, 28, 1)
+#define SEL_SDHI1_STS		SEL_PLL_PACK(CPG_CLKSTATUS, 29, 1)
+
 enum clk_ids {
 	/* Core Clock Outputs exported to DT */
 	LAST_DT_CORE_CLK = R9A07G043_CLK_P0_DIV2,
@@ -85,6 +89,8 @@ static const char * const sel_pll3_3[] = { ".pll3_533", ".pll3_400" };
 static const char * const sel_pll6_2[]	= { ".pll6_250", ".pll5_250" };
 static const char * const sel_shdi[] = { ".clk_533", ".clk_400", ".clk_266" };
 
+static const u32 mtable_sdhi[] = { 1, 2, 3 };
+
 static const struct cpg_core_clk r9a07g043_core_clks[] __initconst = {
 	/* External Clock Inputs */
 	DEF_INPUT("extal", CLK_EXTAL),
@@ -130,8 +136,10 @@ static const struct cpg_core_clk r9a07g043_core_clks[] __initconst = {
 	DEF_MUX("HP", R9A07G043_CLK_HP, SEL_PLL6_2, sel_pll6_2),
 	DEF_FIXED("SPI0", R9A07G043_CLK_SPI0, CLK_DIV_PLL3_C, 1, 2),
 	DEF_FIXED("SPI1", R9A07G043_CLK_SPI1, CLK_DIV_PLL3_C, 1, 4),
-	DEF_SD_MUX("SD0", R9A07G043_CLK_SD0, SEL_SDHI0, sel_shdi),
-	DEF_SD_MUX("SD1", R9A07G043_CLK_SD1, SEL_SDHI1, sel_shdi),
+	DEF_SD_MUX("SD0", R9A07G043_CLK_SD0, SEL_SDHI0, SEL_SDHI0_STS, sel_shdi,
+		   mtable_sdhi, 0, rzg2l_cpg_sd_clk_mux_notifier),
+	DEF_SD_MUX("SD1", R9A07G043_CLK_SD1, SEL_SDHI1, SEL_SDHI0_STS, sel_shdi,
+		   mtable_sdhi, 0, rzg2l_cpg_sd_clk_mux_notifier),
 	DEF_FIXED("SD0_DIV4", CLK_SD0_DIV4, R9A07G043_CLK_SD0, 1, 4),
 	DEF_FIXED("SD1_DIV4", CLK_SD1_DIV4, R9A07G043_CLK_SD1, 1, 4),
 };

drivers/clk/renesas/r9a07g044-cpg.c

@@ -22,6 +22,10 @@
 #define SEL_SDHI0		SEL_PLL_PACK(CPG_PL2SDHI_DSEL, 0, 2)
 #define SEL_SDHI1		SEL_PLL_PACK(CPG_PL2SDHI_DSEL, 4, 2)
 
+/* Clock status configuration. */
+#define SEL_SDHI0_STS		SEL_PLL_PACK(CPG_CLKSTATUS, 28, 1)
+#define SEL_SDHI1_STS		SEL_PLL_PACK(CPG_CLKSTATUS, 29, 1)
+
 enum clk_ids {
 	/* Core Clock Outputs exported to DT */
 	LAST_DT_CORE_CLK = R9A07G054_CLK_DRP_A,
@@ -105,6 +109,8 @@ static const char * const sel_pll6_2[]	= { ".pll6_250", ".pll5_250" };
 static const char * const sel_shdi[] = { ".clk_533", ".clk_400", ".clk_266" };
 static const char * const sel_gpu2[] = { ".pll6", ".pll3_div2_2" };
 
+static const u32 mtable_sdhi[] = { 1, 2, 3 };
+
 static const struct {
 	struct cpg_core_clk common[56];
 #ifdef CONFIG_CLK_R9A07G054
@@ -170,8 +176,10 @@ static const struct {
 		DEF_MUX("HP", R9A07G044_CLK_HP, SEL_PLL6_2, sel_pll6_2),
 		DEF_FIXED("SPI0", R9A07G044_CLK_SPI0, CLK_DIV_PLL3_C, 1, 2),
 		DEF_FIXED("SPI1", R9A07G044_CLK_SPI1, CLK_DIV_PLL3_C, 1, 4),
-		DEF_SD_MUX("SD0", R9A07G044_CLK_SD0, SEL_SDHI0, sel_shdi),
-		DEF_SD_MUX("SD1", R9A07G044_CLK_SD1, SEL_SDHI1, sel_shdi),
+		DEF_SD_MUX("SD0", R9A07G044_CLK_SD0, SEL_SDHI0, SEL_SDHI0_STS, sel_shdi,
+			   mtable_sdhi, 0, rzg2l_cpg_sd_clk_mux_notifier),
+		DEF_SD_MUX("SD1", R9A07G044_CLK_SD1, SEL_SDHI1, SEL_SDHI0_STS, sel_shdi,
+			   mtable_sdhi, 0, rzg2l_cpg_sd_clk_mux_notifier),
 		DEF_FIXED("SD0_DIV4", CLK_SD0_DIV4, R9A07G044_CLK_SD0, 1, 4),
 		DEF_FIXED("SD1_DIV4", CLK_SD1_DIV4, R9A07G044_CLK_SD1, 1, 4),
 		DEF_DIV("G", R9A07G044_CLK_G, CLK_SEL_GPU2, DIVGPU, dtable_1_8),

drivers/clk/renesas/rzg2l-cpg.c

@@ -61,31 +61,37 @@
 #define GET_REG_SAMPLL_CLK1(val)	((val >> 22) & 0xfff)
 #define GET_REG_SAMPLL_CLK2(val)	((val >> 12) & 0xfff)
 
+#define CPG_WEN_BIT		BIT(16)
+
 #define MAX_VCLK_FREQ		(148500000)
 
 /**
  * struct clk_hw_data - clock hardware data
  * @hw: clock hw
  * @conf: clock configuration (register offset, shift, width)
+ * @sconf: clock status configuration (register offset, shift, width)
  * @priv: CPG private data structure
  */
 struct clk_hw_data {
 	struct clk_hw hw;
 	u32 conf;
+	u32 sconf;
 	struct rzg2l_cpg_priv *priv;
 };
 
 #define to_clk_hw_data(_hw)	container_of(_hw, struct clk_hw_data, hw)
 
 /**
- * struct sd_hw_data - SD clock hardware data
+ * struct sd_mux_hw_data - SD MUX clock hardware data
  * @hw_data: clock hw data
+ * @mtable: clock mux table
  */
-struct sd_hw_data {
+struct sd_mux_hw_data {
 	struct clk_hw_data hw_data;
+	const u32 *mtable;
 };
 
-#define to_sd_hw_data(_hw)	container_of(_hw, struct sd_hw_data, hw_data)
+#define to_sd_mux_hw_data(_hw)	container_of(_hw, struct sd_mux_hw_data, hw_data)
 
 struct rzg2l_pll5_param {
 	u32 pl5_fracin;
@@ -142,6 +148,76 @@ static void rzg2l_cpg_del_clk_provider(void *data)
 	of_clk_del_provider(data);
 }
 
+/* Must be called in atomic context. */
+static int rzg2l_cpg_wait_clk_update_done(void __iomem *base, u32 conf)
+{
+	u32 bitmask = GENMASK(GET_WIDTH(conf) - 1, 0) << GET_SHIFT(conf);
+	u32 off = GET_REG_OFFSET(conf);
+	u32 val;
+
+	return readl_poll_timeout_atomic(base + off, val, !(val & bitmask), 10, 200);
+}
+
+int rzg2l_cpg_sd_clk_mux_notifier(struct notifier_block *nb, unsigned long event,
+				  void *data)
+{
+	struct clk_notifier_data *cnd = data;
+	struct clk_hw *hw = __clk_get_hw(cnd->clk);
+	struct clk_hw_data *clk_hw_data = to_clk_hw_data(hw);
+	struct rzg2l_cpg_priv *priv = clk_hw_data->priv;
+	u32 off = GET_REG_OFFSET(clk_hw_data->conf);
+	u32 shift = GET_SHIFT(clk_hw_data->conf);
+	const u32 clk_src_266 = 3;
+	unsigned long flags;
+	int ret;
+
+	if (event != PRE_RATE_CHANGE || (cnd->new_rate / MEGA == 266))
+		return NOTIFY_DONE;
+
+	spin_lock_irqsave(&priv->rmw_lock, flags);
+
+	/*
+	 * As per the HW manual, we should not directly switch from 533 MHz to
+	 * 400 MHz and vice versa. To change the setting from 2’b01 (533 MHz)
+	 * to 2’b10 (400 MHz) or vice versa, Switch to 2’b11 (266 MHz) first,
+	 * and then switch to the target setting (2’b01 (533 MHz) or 2’b10
+	 * (400 MHz)).
+	 * Setting a value of '0' to the SEL_SDHI0_SET or SEL_SDHI1_SET clock
+	 * switching register is prohibited.
+	 * The clock mux has 3 input clocks(533 MHz, 400 MHz, and 266 MHz), and
+	 * the index to value mapping is done by adding 1 to the index.
+	 */
+
+	writel((CPG_WEN_BIT | clk_src_266) << shift, priv->base + off);
+
+	/* Wait for the update done. */
+	ret = rzg2l_cpg_wait_clk_update_done(priv->base, clk_hw_data->sconf);
+
+	spin_unlock_irqrestore(&priv->rmw_lock, flags);
+
+	if (ret)
+		dev_err(priv->dev, "failed to switch to safe clk source\n");
+
+	return notifier_from_errno(ret);
+}
+
+static int rzg2l_register_notifier(struct clk_hw *hw, const struct cpg_core_clk *core,
+				   struct rzg2l_cpg_priv *priv)
+{
+	struct notifier_block *nb;
+
+	if (!core->notifier)
+		return 0;
+
+	nb = devm_kzalloc(priv->dev, sizeof(*nb), GFP_KERNEL);
+	if (!nb)
+		return -ENOMEM;
+
+	nb->notifier_call = core->notifier;
+
+	return clk_notifier_register(hw->clk, nb);
+}
+
 static struct clk * __init
 rzg2l_cpg_div_clk_register(const struct cpg_core_clk *core,
 			   struct clk **clks,
@@ -205,62 +281,43 @@ rzg2l_cpg_mux_clk_register(const struct cpg_core_clk *core,
 static int rzg2l_cpg_sd_clk_mux_set_parent(struct clk_hw *hw, u8 index)
 {
 	struct clk_hw_data *clk_hw_data = to_clk_hw_data(hw);
+	struct sd_mux_hw_data *sd_mux_hw_data = to_sd_mux_hw_data(clk_hw_data);
 	struct rzg2l_cpg_priv *priv = clk_hw_data->priv;
 	u32 off = GET_REG_OFFSET(clk_hw_data->conf);
 	u32 shift = GET_SHIFT(clk_hw_data->conf);
-	const u32 clk_src_266 = 2;
-	u32 msk, val, bitmask;
 	unsigned long flags;
+	u32 val;
 	int ret;
 
-	/*
-	 * As per the HW manual, we should not directly switch from 533 MHz to
-	 * 400 MHz and vice versa. To change the setting from 2’b01 (533 MHz)
-	 * to 2’b10 (400 MHz) or vice versa, Switch to 2’b11 (266 MHz) first,
-	 * and then switch to the target setting (2’b01 (533 MHz) or 2’b10
-	 * (400 MHz)).
-	 * Setting a value of '0' to the SEL_SDHI0_SET or SEL_SDHI1_SET clock
-	 * switching register is prohibited.
-	 * The clock mux has 3 input clocks(533 MHz, 400 MHz, and 266 MHz), and
-	 * the index to value mapping is done by adding 1 to the index.
-	 */
-	bitmask = (GENMASK(GET_WIDTH(clk_hw_data->conf) - 1, 0) << shift) << 16;
-	msk = off ? CPG_CLKSTATUS_SELSDHI1_STS : CPG_CLKSTATUS_SELSDHI0_STS;
+	val = clk_mux_index_to_val(sd_mux_hw_data->mtable, CLK_MUX_ROUND_CLOSEST, index);
+
 	spin_lock_irqsave(&priv->rmw_lock, flags);
-	if (index != clk_src_266) {
-		writel(bitmask | ((clk_src_266 + 1) << shift), priv->base + off);
-
-		ret = readl_poll_timeout_atomic(priv->base + CPG_CLKSTATUS, val,
-						!(val & msk), 10,
-						CPG_SDHI_CLK_SWITCH_STATUS_TIMEOUT_US);
-		if (ret)
-			goto unlock;
-	}
 
-	writel(bitmask | ((index + 1) << shift), priv->base + off);
+	writel((CPG_WEN_BIT | val) << shift, priv->base + off);
+
+	/* Wait for the update done. */
+	ret = rzg2l_cpg_wait_clk_update_done(priv->base, clk_hw_data->sconf);
 
-	ret = readl_poll_timeout_atomic(priv->base + CPG_CLKSTATUS, val,
-					!(val & msk), 10,
-					CPG_SDHI_CLK_SWITCH_STATUS_TIMEOUT_US);
-unlock:
 	spin_unlock_irqrestore(&priv->rmw_lock, flags);
 
 	if (ret)
-		dev_err(priv->dev, "failed to switch clk source\n");
+		dev_err(priv->dev, "Failed to switch parent\n");
 
 	return ret;
 }
 
 static u8 rzg2l_cpg_sd_clk_mux_get_parent(struct clk_hw *hw)
 {
 	struct clk_hw_data *clk_hw_data = to_clk_hw_data(hw);
+	struct sd_mux_hw_data *sd_mux_hw_data = to_sd_mux_hw_data(clk_hw_data);
 	struct rzg2l_cpg_priv *priv = clk_hw_data->priv;
-	u32 val = readl(priv->base + GET_REG_OFFSET(clk_hw_data->conf));
+	u32 val;
 
+	val = readl(priv->base + GET_REG_OFFSET(clk_hw_data->conf));
 	val >>= GET_SHIFT(clk_hw_data->conf);
 	val &= GENMASK(GET_WIDTH(clk_hw_data->conf) - 1, 0);
 
-	return val ? val - 1 : 0;
+	return clk_mux_val_to_index(hw, sd_mux_hw_data->mtable, CLK_MUX_ROUND_CLOSEST, val);
 }
 
 static const struct clk_ops rzg2l_cpg_sd_clk_mux_ops = {
@@ -274,31 +331,40 @@ rzg2l_cpg_sd_mux_clk_register(const struct cpg_core_clk *core,
 			      void __iomem *base,
 			      struct rzg2l_cpg_priv *priv)
 {
-	struct sd_hw_data *sd_hw_data;
+	struct sd_mux_hw_data *sd_mux_hw_data;
 	struct clk_init_data init;
 	struct clk_hw *clk_hw;
 	int ret;
 
-	sd_hw_data = devm_kzalloc(priv->dev, sizeof(*sd_hw_data), GFP_KERNEL);
-	if (!sd_hw_data)
+	sd_mux_hw_data = devm_kzalloc(priv->dev, sizeof(*sd_mux_hw_data), GFP_KERNEL);
+	if (!sd_mux_hw_data)
 		return ERR_PTR(-ENOMEM);
 
-	sd_hw_data->hw_data.priv = priv;
-	sd_hw_data->hw_data.conf = core->conf;
+	sd_mux_hw_data->hw_data.priv = priv;
+	sd_mux_hw_data->hw_data.conf = core->conf;
+	sd_mux_hw_data->hw_data.sconf = core->sconf;
+	sd_mux_hw_data->mtable = core->mtable;
 
 	init.name = core->name;
 	init.ops = &rzg2l_cpg_sd_clk_mux_ops;
-	init.flags = 0;
+	init.flags = core->flag;
 	init.num_parents = core->num_parents;
 	init.parent_names = core->parent_names;
 
-	clk_hw = &sd_hw_data->hw_data.hw;
+	clk_hw = &sd_mux_hw_data->hw_data.hw;
 	clk_hw->init = &init;
 
 	ret = devm_clk_hw_register(priv->dev, clk_hw);
 	if (ret)
 		return ERR_PTR(ret);
 
+	ret = rzg2l_register_notifier(clk_hw, core, priv);
+	if (ret) {
+		dev_err(priv->dev, "Failed to register notifier for %s\n",
+			core->name);
+		return ERR_PTR(ret);
+	}
+
 	return clk_hw->clk;
 }
 

drivers/clk/renesas/rzg2l-cpg.h

@@ -9,6 +9,8 @@
 #ifndef __RENESAS_RZG2L_CPG_H__
 #define __RENESAS_RZG2L_CPG_H__
 
+#include <linux/notifier.h>
+
 #define CPG_SIPLL5_STBY		(0x140)
 #define CPG_SIPLL5_CLK1		(0x144)
 #define CPG_SIPLL5_CLK3		(0x14C)
@@ -42,8 +44,6 @@
 #define CPG_CLKSTATUS_SELSDHI0_STS	BIT(28)
 #define CPG_CLKSTATUS_SELSDHI1_STS	BIT(29)
 
-#define CPG_SDHI_CLK_SWITCH_STATUS_TIMEOUT_US	200
-
 /* n = 0/1/2 for PLL1/4/6 */
 #define CPG_SAMPLL_CLK1(n)	(0x04 + (16 * n))
 #define CPG_SAMPLL_CLK2(n)	(0x08 + (16 * n))
@@ -86,8 +86,11 @@ struct cpg_core_clk {
 	unsigned int mult;
 	unsigned int type;
 	unsigned int conf;
+	unsigned int sconf;
 	const struct clk_div_table *dtable;
+	const u32 *mtable;
 	const char * const *parent_names;
+	notifier_fn_t notifier;
 	u32 flag;
 	u32 mux_flags;
 	int num_parents;
@@ -150,10 +153,11 @@ enum clk_types {
 		 .parent_names = _parent_names, \
 		 .num_parents = ARRAY_SIZE(_parent_names), \
 		 .mux_flags = CLK_MUX_READ_ONLY)
-#define DEF_SD_MUX(_name, _id, _conf, _parent_names) \
-	DEF_TYPE(_name, _id, CLK_TYPE_SD_MUX, .conf = _conf, \
+#define DEF_SD_MUX(_name, _id, _conf, _sconf, _parent_names, _mtable, _clk_flags, _notifier) \
+	DEF_TYPE(_name, _id, CLK_TYPE_SD_MUX, .conf = _conf, .sconf = _sconf, \
 		 .parent_names = _parent_names, \
-		 .num_parents = ARRAY_SIZE(_parent_names))
+		 .num_parents = ARRAY_SIZE(_parent_names), \
+		 .mtable = _mtable, .flag = _clk_flags, .notifier = _notifier)
 #define DEF_PLL5_FOUTPOSTDIV(_name, _id, _parent) \
 	DEF_TYPE(_name, _id, CLK_TYPE_SIPLL5, .parent = _parent)
 #define DEF_PLL5_4_MUX(_name, _id, _conf, _parent_names) \
@@ -272,4 +276,6 @@ extern const struct rzg2l_cpg_info r9a07g044_cpg_info;
 extern const struct rzg2l_cpg_info r9a07g054_cpg_info;
 extern const struct rzg2l_cpg_info r9a09g011_cpg_info;
 
+int rzg2l_cpg_sd_clk_mux_notifier(struct notifier_block *nb, unsigned long event, void *data);
+
 #endif