1 files changed, 295 insertions, 17 deletions

diff --git a/drivers/clk/mvebu/armada-37xx-periph.c b/drivers/clk/mvebu/armada-37xx-periph.c
index 72e2ce46f4b0..87213ea7fc84 100644
--- a/drivers/clk/mvebu/armada-37xx-periph.c
+++ b/drivers/clk/mvebu/armada-37xx-periph.c
@@ -21,9 +21,11 @@
  */
 
 #include <linux/clk-provider.h>
+#include <linux/mfd/syscon.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
+#include <linux/regmap.h>
 #include <linux/slab.h>
 
 #define TBG_SEL		0x0
@@ -33,6 +35,26 @@
 #define CLK_SEL		0x10
 #define CLK_DIS		0x14
 
+#define LOAD_LEVEL_NR	4
+
+#define ARMADA_37XX_NB_L0L1	0x18
+#define ARMADA_37XX_NB_L2L3	0x1C
+#define		ARMADA_37XX_NB_TBG_DIV_OFF	13
+#define		ARMADA_37XX_NB_TBG_DIV_MASK	0x7
+#define		ARMADA_37XX_NB_CLK_SEL_OFF	11
+#define		ARMADA_37XX_NB_CLK_SEL_MASK	0x1
+#define		ARMADA_37XX_NB_TBG_SEL_OFF	9
+#define		ARMADA_37XX_NB_TBG_SEL_MASK	0x3
+#define		ARMADA_37XX_NB_CONFIG_SHIFT	16
+#define ARMADA_37XX_NB_DYN_MOD	0x24
+#define		ARMADA_37XX_NB_DFS_EN	31
+#define ARMADA_37XX_NB_CPU_LOAD	0x30
+#define		ARMADA_37XX_NB_CPU_LOAD_MASK	0x3
+#define		ARMADA_37XX_DVFS_LOAD_0		0
+#define		ARMADA_37XX_DVFS_LOAD_1		1
+#define		ARMADA_37XX_DVFS_LOAD_2		2
+#define		ARMADA_37XX_DVFS_LOAD_3		3
+
 struct clk_periph_driver_data {
 	struct clk_hw_onecell_data *hw_data;
 	spinlock_t lock;
@@ -46,7 +68,18 @@ struct clk_double_div {
 	u8 shift2;
 };
 
+struct clk_pm_cpu {
+	struct clk_hw hw;
+	void __iomem *reg_mux;
+	u8 shift_mux;
+	u32 mask_mux;
+	void __iomem *reg_div;
+	u8 shift_div;
+	struct regmap *nb_pm_base;
+};
+
 #define to_clk_double_div(_hw) container_of(_hw, struct clk_double_div, hw)
+#define to_clk_pm_cpu(_hw) container_of(_hw, struct clk_pm_cpu, hw)
 
 struct clk_periph_data {
 	const char *name;
@@ -55,6 +88,7 @@ struct clk_periph_data {
 	struct clk_hw *mux_hw;
 	struct clk_hw *rate_hw;
 	struct clk_hw *gate_hw;
+	struct clk_hw *muxrate_hw;
 	bool is_double_div;
 };
 
@@ -79,7 +113,9 @@ static const struct clk_div_table clk_table2[] = {
 	{ .val = 1, .div = 4, },
 	{ .val = 0, .div = 0, }, /* last entry */
 };
+
 static const struct clk_ops clk_double_div_ops;
+static const struct clk_ops clk_pm_cpu_ops;
 
 #define PERIPH_GATE(_name, _bit)		\
 struct clk_gate gate_##_name = {		\
@@ -121,6 +157,18 @@ struct clk_divider rate_##_name = {		\
 	}					\
 };
 
+#define PERIPH_PM_CPU(_name, _shift1, _reg, _shift2)	\
+struct clk_pm_cpu muxrate_##_name = {		\
+	.reg_mux = (void *)TBG_SEL,		\
+	.mask_mux = 3,				\
+	.shift_mux = _shift1,			\
+	.reg_div = (void *)_reg,		\
+	.shift_div = _shift2,			\
+	.hw.init = &(struct clk_init_data){	\
+		.ops =  &clk_pm_cpu_ops,	\
+	}					\
+};
+
 #define PERIPH_CLK_FULL_DD(_name, _bit, _shift, _reg1, _reg2, _shift1, _shift2)\
 static PERIPH_GATE(_name, _bit);			    \
 static PERIPH_MUX(_name, _shift);			    \
@@ -135,10 +183,6 @@ static PERIPH_DIV(_name, _reg, _shift1, _table);
 static PERIPH_GATE(_name, _bit);			\
 static PERIPH_DIV(_name, _reg, _shift, _table);
 
-#define PERIPH_CLK_MUX_DIV(_name, _shift,  _reg, _shift_div, _table)	\
-static PERIPH_MUX(_name, _shift);			    \
-static PERIPH_DIV(_name, _reg, _shift_div, _table);
-
 #define PERIPH_CLK_MUX_DD(_name, _shift, _reg1, _reg2, _shift1, _shift2)\
 static PERIPH_MUX(_name, _shift);			    \
 static PERIPH_DOUBLEDIV(_name, _reg1, _reg2, _shift1, _shift2);
@@ -179,13 +223,12 @@ static PERIPH_DOUBLEDIV(_name, _reg1, _reg2, _shift1, _shift2);
 	  .rate_hw = &rate_##_name.hw,				\
 	}
 
-#define REF_CLK_MUX_DIV(_name)				\
+#define REF_CLK_PM_CPU(_name)				\
 	{ .name = #_name,				\
 	  .parent_names = (const char *[]){ "TBG-A-P",	\
 	      "TBG-B-P", "TBG-A-S", "TBG-B-S"},		\
 	  .num_parents = 4,				\
-	  .mux_hw = &mux_##_name.hw,			\
-	  .rate_hw = &rate_##_name.hw,			\
+	  .muxrate_hw = &muxrate_##_name.hw,		\
 	}
 
 #define REF_CLK_MUX_DD(_name)				\
@@ -215,9 +258,9 @@ PERIPH_CLK_FULL_DD(ddr_fclk, 21, 16, DIV_SEL0, DIV_SEL0, 15, 12);
 PERIPH_CLK_FULL(trace, 22, 18, DIV_SEL0, 20, clk_table6);
 PERIPH_CLK_FULL(counter, 23, 20, DIV_SEL0, 23, clk_table6);
 PERIPH_CLK_FULL_DD(eip97, 24, 24, DIV_SEL2, DIV_SEL2, 22, 19);
-PERIPH_CLK_MUX_DIV(cpu, 22, DIV_SEL0, 28, clk_table6);
+static PERIPH_PM_CPU(cpu, 22, DIV_SEL0, 28);
 
-static struct clk_periph_data data_nb[] ={
+static struct clk_periph_data data_nb[] = {
 	REF_CLK_FULL_DD(mmc),
 	REF_CLK_FULL_DD(sata_host),
 	REF_CLK_FULL_DD(sec_at),
@@ -234,7 +277,7 @@ static struct clk_periph_data data_nb[] ={
 	REF_CLK_FULL(trace),
 	REF_CLK_FULL(counter),
 	REF_CLK_FULL_DD(eip97),
-	REF_CLK_MUX_DIV(cpu),
+	REF_CLK_PM_CPU(cpu),
 	{ },
 };
 
@@ -281,7 +324,7 @@ static unsigned int get_div(void __iomem *reg, int shift)
 }
 
 static unsigned long clk_double_div_recalc_rate(struct clk_hw *hw,
-		unsigned long parent_rate)
+						unsigned long parent_rate)
 {
 	struct clk_double_div *double_div = to_clk_double_div(hw);
 	unsigned int div;
@@ -296,6 +339,222 @@ static const struct clk_ops clk_double_div_ops = {
 	.recalc_rate = clk_double_div_recalc_rate,
 };
 
+static void armada_3700_pm_dvfs_update_regs(unsigned int load_level,
+					    unsigned int *reg,
+					    unsigned int *offset)
+{
+	if (load_level <= ARMADA_37XX_DVFS_LOAD_1)
+		*reg = ARMADA_37XX_NB_L0L1;
+	else
+		*reg = ARMADA_37XX_NB_L2L3;
+
+	if (load_level == ARMADA_37XX_DVFS_LOAD_0 ||
+	    load_level ==  ARMADA_37XX_DVFS_LOAD_2)
+		*offset += ARMADA_37XX_NB_CONFIG_SHIFT;
+}
+
+static bool armada_3700_pm_dvfs_is_enabled(struct regmap *base)
+{
+	unsigned int val, reg = ARMADA_37XX_NB_DYN_MOD;
+
+	if (IS_ERR(base))
+		return false;
+
+	regmap_read(base, reg, &val);
+
+	return !!(val & BIT(ARMADA_37XX_NB_DFS_EN));
+}
+
+static unsigned int armada_3700_pm_dvfs_get_cpu_div(struct regmap *base)
+{
+	unsigned int reg = ARMADA_37XX_NB_CPU_LOAD;
+	unsigned int offset = ARMADA_37XX_NB_TBG_DIV_OFF;
+	unsigned int load_level, div;
+
+	/*
+	 * This function is always called after the function
+	 * armada_3700_pm_dvfs_is_enabled, so no need to check again
+	 * if the base is valid.
+	 */
+	regmap_read(base, reg, &load_level);
+
+	/*
+	 * The register and the offset inside this register accessed to
+	 * read the current divider depend on the load level
+	 */
+	load_level &= ARMADA_37XX_NB_CPU_LOAD_MASK;
+	armada_3700_pm_dvfs_update_regs(load_level, &reg, &offset);
+
+	regmap_read(base, reg, &div);
+
+	return (div >> offset) & ARMADA_37XX_NB_TBG_DIV_MASK;
+}
+
+static unsigned int armada_3700_pm_dvfs_get_cpu_parent(struct regmap *base)
+{
+	unsigned int reg = ARMADA_37XX_NB_CPU_LOAD;
+	unsigned int offset = ARMADA_37XX_NB_TBG_SEL_OFF;
+	unsigned int load_level, sel;
+
+	/*
+	 * This function is always called after the function
+	 * armada_3700_pm_dvfs_is_enabled, so no need to check again
+	 * if the base is valid
+	 */
+	regmap_read(base, reg, &load_level);
+
+	/*
+	 * The register and the offset inside this register accessed to
+	 * read the current divider depend on the load level
+	 */
+	load_level &= ARMADA_37XX_NB_CPU_LOAD_MASK;
+	armada_3700_pm_dvfs_update_regs(load_level, &reg, &offset);
+
+	regmap_read(base, reg, &sel);
+
+	return (sel >> offset) & ARMADA_37XX_NB_TBG_SEL_MASK;
+}
+
+static u8 clk_pm_cpu_get_parent(struct clk_hw *hw)
+{
+	struct clk_pm_cpu *pm_cpu = to_clk_pm_cpu(hw);
+	int num_parents = clk_hw_get_num_parents(hw);
+	u32 val;
+
+	if (armada_3700_pm_dvfs_is_enabled(pm_cpu->nb_pm_base)) {
+		val = armada_3700_pm_dvfs_get_cpu_parent(pm_cpu->nb_pm_base);
+	} else {
+		val = readl(pm_cpu->reg_mux) >> pm_cpu->shift_mux;
+		val &= pm_cpu->mask_mux;
+	}
+
+	if (val >= num_parents)
+		return -EINVAL;
+
+	return val;
+}
+
+static int clk_pm_cpu_set_parent(struct clk_hw *hw, u8 index)
+{
+	struct clk_pm_cpu *pm_cpu = to_clk_pm_cpu(hw);
+	struct regmap *base = pm_cpu->nb_pm_base;
+	int load_level;
+
+	/*
+	 * We set the clock parent only if the DVFS is available but
+	 * not enabled.
+	 */
+	if (IS_ERR(base) || armada_3700_pm_dvfs_is_enabled(base))
+		return -EINVAL;
+
+	/* Set the parent clock for all the load level */
+	for (load_level = 0; load_level < LOAD_LEVEL_NR; load_level++) {
+		unsigned int reg, mask,  val,
+			offset = ARMADA_37XX_NB_TBG_SEL_OFF;
+
+		armada_3700_pm_dvfs_update_regs(load_level, &reg, &offset);
+
+		val = index << offset;
+		mask = ARMADA_37XX_NB_TBG_SEL_MASK << offset;
+		regmap_update_bits(base, reg, mask, val);
+	}
+	return 0;
+}
+
+static unsigned long clk_pm_cpu_recalc_rate(struct clk_hw *hw,
+					    unsigned long parent_rate)
+{
+	struct clk_pm_cpu *pm_cpu = to_clk_pm_cpu(hw);
+	unsigned int div;
+
+	if (armada_3700_pm_dvfs_is_enabled(pm_cpu->nb_pm_base))
+		div = armada_3700_pm_dvfs_get_cpu_div(pm_cpu->nb_pm_base);
+	else
+		div = get_div(pm_cpu->reg_div, pm_cpu->shift_div);
+	return DIV_ROUND_UP_ULL((u64)parent_rate, div);
+}
+
+static long clk_pm_cpu_round_rate(struct clk_hw *hw, unsigned long rate,
+				  unsigned long *parent_rate)
+{
+	struct clk_pm_cpu *pm_cpu = to_clk_pm_cpu(hw);
+	struct regmap *base = pm_cpu->nb_pm_base;
+	unsigned int div = *parent_rate / rate;
+	unsigned int load_level;
+	/* only available when DVFS is enabled */
+	if (!armada_3700_pm_dvfs_is_enabled(base))
+		return -EINVAL;
+
+	for (load_level = 0; load_level < LOAD_LEVEL_NR; load_level++) {
+		unsigned int reg, val, offset = ARMADA_37XX_NB_TBG_DIV_OFF;
+
+		armada_3700_pm_dvfs_update_regs(load_level, &reg, &offset);
+
+		regmap_read(base, reg, &val);
+
+		val >>= offset;
+		val &= ARMADA_37XX_NB_TBG_DIV_MASK;
+		if (val == div)
+			/*
+			 * We found a load level matching the target
+			 * divider, switch to this load level and
+			 * return.
+			 */
+			return *parent_rate / div;
+	}
+
+	/* We didn't find any valid divider */
+	return -EINVAL;
+}
+
+static int clk_pm_cpu_set_rate(struct clk_hw *hw, unsigned long rate,
+			       unsigned long parent_rate)
+{
+	struct clk_pm_cpu *pm_cpu = to_clk_pm_cpu(hw);
+	struct regmap *base = pm_cpu->nb_pm_base;
+	unsigned int div = parent_rate / rate;
+	unsigned int load_level;
+
+	/* only available when DVFS is enabled */
+	if (!armada_3700_pm_dvfs_is_enabled(base))
+		return -EINVAL;
+
+	for (load_level = 0; load_level < LOAD_LEVEL_NR; load_level++) {
+		unsigned int reg, mask, val,
+			offset = ARMADA_37XX_NB_TBG_DIV_OFF;
+
+		armada_3700_pm_dvfs_update_regs(load_level, &reg, &offset);
+
+		regmap_read(base, reg, &val);
+		val >>= offset;
+		val &= ARMADA_37XX_NB_TBG_DIV_MASK;
+
+		if (val == div) {
+			/*
+			 * We found a load level matching the target
+			 * divider, switch to this load level and
+			 * return.
+			 */
+			reg = ARMADA_37XX_NB_CPU_LOAD;
+			mask = ARMADA_37XX_NB_CPU_LOAD_MASK;
+			regmap_update_bits(base, reg, mask, load_level);
+
+			return rate;
+		}
+	}
+
+	/* We didn't find any valid divider */
+	return -EINVAL;
+}
+
+static const struct clk_ops clk_pm_cpu_ops = {
+	.get_parent = clk_pm_cpu_get_parent,
+	.set_parent = clk_pm_cpu_set_parent,
+	.round_rate = clk_pm_cpu_round_rate,
+	.set_rate = clk_pm_cpu_set_rate,
+	.recalc_rate = clk_pm_cpu_recalc_rate,
+};
+
 static const struct of_device_id armada_3700_periph_clock_of_match[] = {
 	{ .compatible = "marvell,armada-3700-periph-clock-nb",
 	  .data = data_nb, },
@@ -303,6 +562,7 @@ static const struct of_device_id armada_3700_periph_clock_of_match[] = {
 	.data = data_sb, },
 	{ }
 };
+
 static int armada_3700_add_composite_clk(const struct clk_periph_data *data,
 					 void __iomem *reg, spinlock_t *lock,
 					 struct device *dev, struct clk_hw **hw)
@@ -354,10 +614,29 @@ static int armada_3700_add_composite_clk(const struct clk_periph_data *data,
 		}
 	}
 
+	if (data->muxrate_hw) {
+		struct clk_pm_cpu *pmcpu_clk;
+		struct clk_hw *muxrate_hw = data->muxrate_hw;
+		struct regmap *map;
+
+		pmcpu_clk =  to_clk_pm_cpu(muxrate_hw);
+		pmcpu_clk->reg_mux = reg + (u64)pmcpu_clk->reg_mux;
+		pmcpu_clk->reg_div = reg + (u64)pmcpu_clk->reg_div;
+
+		mux_hw = muxrate_hw;
+		rate_hw = muxrate_hw;
+		mux_ops = muxrate_hw->init->ops;
+		rate_ops = muxrate_hw->init->ops;
+
+		map = syscon_regmap_lookup_by_compatible(
+				"marvell,armada-3700-nb-pm");
+		pmcpu_clk->nb_pm_base = map;
+	}
+
 	*hw = clk_hw_register_composite(dev, data->name, data->parent_names,
-				       data->num_parents, mux_hw,
-				       mux_ops, rate_hw, rate_ops,
-				       gate_hw, gate_ops, CLK_IGNORE_UNUSED);
+					data->num_parents, mux_hw,
+					mux_ops, rate_hw, rate_ops,
+					gate_hw, gate_ops, CLK_IGNORE_UNUSED);
 
 	return PTR_ERR_OR_ZERO(*hw);
 }
@@ -403,12 +682,11 @@ static int armada_3700_periph_clock_probe(struct platform_device *pdev)
 		if (armada_3700_add_composite_clk(&data[i], reg,
 						  &driver_data->lock, dev, hw))
 			dev_err(dev, "Can't register periph clock %s\n",
-			       data[i].name);
-
+				data[i].name);
 	}
 
 	ret = of_clk_add_hw_provider(np, of_clk_hw_onecell_get,
-				  driver_data->hw_data);
+				     driver_data->hw_data);
 	if (ret) {
 		for (i = 0; i < num_periph; i++)
 			clk_hw_unregister(driver_data->hw_data->hws[i]);