[PATCH] clk: socfpga: agilex: add clock driver for eASIC N5X platform

[Dinh Nguyen]

Add support for Intel's eASIC N5X platform. The clock manager driver for
the N5X is very similar to the Agilex platform, we can re-use most of
the Agilex clock driver.

This patch makes the necessary changes for the driver to differentiate
between the Agilex and the N5X platforms.

Signed-off-by: Dinh Nguyen <dinguyen@xxxxxxxxxx>
---
 drivers/clk/socfpga/clk-agilex.c     | 88 +++++++++++++++++++++++++++-
 drivers/clk/socfpga/clk-periph-s10.c | 53 +++++++++++++++++
 drivers/clk/socfpga/clk-pll-s10.c    | 85 ++++++++++++++++++++++++++-
 drivers/clk/socfpga/stratix10-clk.h  | 15 +++++
 4 files changed, 238 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/socfpga/clk-agilex.c b/drivers/clk/socfpga/clk-agilex.c
index bb3e80928ebe..f9394ed8a41d 100644
--- a/drivers/clk/socfpga/clk-agilex.c
+++ b/drivers/clk/socfpga/clk-agilex.c
@@ -196,6 +196,17 @@ static const struct stratix10_pll_clock agilex_pll_clks[] = {
 	  0, 0x9c},
 };
 
+static const struct n5x_perip_c_clock n5x_main_perip_c_clks[] = {
+	{ AGILEX_MAIN_PLL_C0_CLK, "main_pll_c0", "main_pll", NULL, 1, 0, 0x54, 0},
+	{ AGILEX_MAIN_PLL_C1_CLK, "main_pll_c1", "main_pll", NULL, 1, 0, 0x54, 8},
+	{ AGILEX_MAIN_PLL_C2_CLK, "main_pll_c2", "main_pll", NULL, 1, 0, 0x54, 16},
+	{ AGILEX_MAIN_PLL_C3_CLK, "main_pll_c3", "main_pll", NULL, 1, 0, 0x54, 24},
+	{ AGILEX_PERIPH_PLL_C0_CLK, "peri_pll_c0", "periph_pll", NULL, 1, 0, 0xA8, 0},
+	{ AGILEX_PERIPH_PLL_C1_CLK, "peri_pll_c1", "periph_pll", NULL, 1, 0, 0xA8, 8},
+	{ AGILEX_PERIPH_PLL_C2_CLK, "peri_pll_c2", "periph_pll", NULL, 1, 0, 0xA8, 16},
+	{ AGILEX_PERIPH_PLL_C3_CLK, "peri_pll_c3", "periph_pll", NULL, 1, 0, 0xA8, 24},
+};
+
 static const struct stratix10_perip_c_clock agilex_main_perip_c_clks[] = {
 	{ AGILEX_MAIN_PLL_C0_CLK, "main_pll_c0", "main_pll", NULL, 1, 0, 0x58},
 	{ AGILEX_MAIN_PLL_C1_CLK, "main_pll_c1", "main_pll", NULL, 1, 0, 0x5C},
@@ -289,6 +300,25 @@ static const struct stratix10_gate_clock agilex_gate_clks[] = {
 	  10, 0, 0, 0, 0, 0, 4},
 };
 
+static int n5x_clk_register_c_perip(const struct n5x_perip_c_clock *clks,
+				       int nums, struct stratix10_clock_data *data)
+{
+	struct clk *clk;
+	void __iomem *base = data->base;
+	int i;
+
+	for (i = 0; i < nums; i++) {
+		clk = n5x_register_periph(&clks[i], base);
+		if (IS_ERR(clk)) {
+			pr_err("%s: failed to register clock %s\n",
+			       __func__, clks[i].name);
+			continue;
+		}
+		data->clk_data.clks[clks[i].id] = clk;
+	}
+	return 0;
+}
+
 static int agilex_clk_register_c_perip(const struct stratix10_perip_c_clock *clks,
 				       int nums, struct stratix10_clock_data *data)
 {
@@ -367,6 +397,26 @@ static int agilex_clk_register_pll(const struct stratix10_pll_clock *clks,
 	return 0;
 }
 
+static int n5x_clk_register_pll(const struct stratix10_pll_clock *clks,
+				 int nums, struct stratix10_clock_data *data)
+{
+	struct clk *clk;
+	void __iomem *base = data->base;
+	int i;
+
+	for (i = 0; i < nums; i++) {
+		clk = n5x_register_pll(&clks[i], base);
+		if (IS_ERR(clk)) {
+			pr_err("%s: failed to register clock %s\n",
+			       __func__, clks[i].name);
+			continue;
+		}
+		data->clk_data.clks[clks[i].id] = clk;
+	}
+
+	return 0;
+}
+
 static struct stratix10_clock_data *__socfpga_agilex_clk_init(struct platform_device *pdev,
 						    int nr_clks)
 {
@@ -401,7 +451,7 @@ static struct stratix10_clock_data *__socfpga_agilex_clk_init(struct platform_de
 	return clk_data;
 }
 
-static int agilex_clkmgr_probe(struct platform_device *pdev)
+static int agilex_clkmgr_init(struct platform_device *pdev)
 {
 	struct stratix10_clock_data *clk_data;
 
@@ -423,9 +473,43 @@ static int agilex_clkmgr_probe(struct platform_device *pdev)
 	return 0;
 }
 
+static int n5x_clkmgr_init(struct platform_device *pdev)
+{
+	struct stratix10_clock_data *clk_data;
+
+	clk_data = __socfpga_agilex_clk_init(pdev, AGILEX_NUM_CLKS);
+	if (IS_ERR(clk_data))
+		return PTR_ERR(clk_data);
+
+	n5x_clk_register_pll(agilex_pll_clks, ARRAY_SIZE(agilex_pll_clks), clk_data);
+
+	n5x_clk_register_c_perip(n5x_main_perip_c_clks,
+				 ARRAY_SIZE(n5x_main_perip_c_clks), clk_data);
+
+	agilex_clk_register_cnt_perip(agilex_main_perip_cnt_clks,
+				   ARRAY_SIZE(agilex_main_perip_cnt_clks),
+				   clk_data);
+
+	agilex_clk_register_gate(agilex_gate_clks, ARRAY_SIZE(agilex_gate_clks),
+			      clk_data);
+	return 0;
+}
+
+static int agilex_clkmgr_probe(struct platform_device *pdev)
+{
+	int (*probe_func)(struct platform_device *);
+
+	probe_func = of_device_get_match_data(&pdev->dev);
+	if (!probe_func)
+		return -ENODEV;
+	return	probe_func(pdev);;
+}
+
 static const struct of_device_id agilex_clkmgr_match_table[] = {
 	{ .compatible = "intel,agilex-clkmgr",
-	  .data = agilex_clkmgr_probe },
+	  .data = agilex_clkmgr_init },
+	{ .compatible = "intel,n5x-clkmgr",
+	  .data = n5x_clkmgr_init },
 	{ }
 };
 
diff --git a/drivers/clk/socfpga/clk-periph-s10.c b/drivers/clk/socfpga/clk-periph-s10.c
index 397b77b89b16..135581c41c05 100644
--- a/drivers/clk/socfpga/clk-periph-s10.c
+++ b/drivers/clk/socfpga/clk-periph-s10.c
@@ -15,6 +15,21 @@
 
 #define to_periph_clk(p) container_of(p, struct socfpga_periph_clk, hw.hw)
 
+static unsigned long n5x_clk_peri_c_clk_recalc_rate(struct clk_hw *hwclk,
+					     unsigned long parent_rate)
+{
+	struct socfpga_periph_clk *socfpgaclk = to_periph_clk(hwclk);
+	unsigned long div;
+	unsigned long shift = socfpgaclk->shift;
+	u32 val;
+
+	val = readl(socfpgaclk->hw.reg);
+	val &= (0x1F << shift);
+	div = (val >> shift) + 1;
+
+	return parent_rate / div;
+}
+
 static unsigned long clk_peri_c_clk_recalc_rate(struct clk_hw *hwclk,
 					     unsigned long parent_rate)
 {
@@ -63,6 +78,11 @@ static u8 clk_periclk_get_parent(struct clk_hw *hwclk)
 	return parent;
 }
 
+static const struct clk_ops n5x_peri_c_clk_ops = {
+	.recalc_rate = n5x_clk_peri_c_clk_recalc_rate,
+	.get_parent = clk_periclk_get_parent,
+};
+
 static const struct clk_ops peri_c_clk_ops = {
 	.recalc_rate = clk_peri_c_clk_recalc_rate,
 	.get_parent = clk_periclk_get_parent,
@@ -107,6 +127,39 @@ struct clk *s10_register_periph(const struct stratix10_perip_c_clock *clks,
 	return clk;
 }
 
+struct clk *n5x_register_periph(const struct n5x_perip_c_clock *clks,
+				void __iomem *regbase)
+{
+	struct clk *clk;
+	struct socfpga_periph_clk *periph_clk;
+	struct clk_init_data init;
+	const char *name = clks->name;
+	const char *parent_name = clks->parent_name;
+
+	periph_clk = kzalloc(sizeof(*periph_clk), GFP_KERNEL);
+	if (WARN_ON(!periph_clk))
+		return NULL;
+
+	periph_clk->hw.reg = regbase + clks->offset;
+	periph_clk->shift = clks->shift;
+
+	init.name = name;
+	init.ops = &n5x_peri_c_clk_ops;
+	init.flags = clks->flags;
+
+	init.num_parents = clks->num_parents;
+	init.parent_names = parent_name ? &parent_name : NULL;
+
+	periph_clk->hw.hw.init = &init;
+
+	clk = clk_register(NULL, &periph_clk->hw.hw);
+	if (WARN_ON(IS_ERR(clk))) {
+		kfree(periph_clk);
+		return NULL;
+	}
+	return clk;
+}
+
 struct clk *s10_register_cnt_periph(const struct stratix10_perip_cnt_clock *clks,
 				    void __iomem *regbase)
 {
diff --git a/drivers/clk/socfpga/clk-pll-s10.c b/drivers/clk/socfpga/clk-pll-s10.c
index 4e268953b7da..4bdf64be3ed4 100644
--- a/drivers/clk/socfpga/clk-pll-s10.c
+++ b/drivers/clk/socfpga/clk-pll-s10.c
@@ -27,10 +27,37 @@
 #define SWCTRLBTCLKSEL_MASK		0x200
 #define SWCTRLBTCLKSEL_SHIFT		9
 
+#define SOCFPGA_N5X_PLLDIV_FDIV_MASK	GENMASK(16, 8)
+#define SOCFPGA_N5X_PLLDIV_FDIV_SHIFT	8
+#define SOCFPGA_N5X_PLLDIV_RDIV_MASK	GENMASK(5, 0)
+#define SOCFPGA_N5X_PLLDIV_QDIV_MASK	GENMASK(26, 24)
+#define SOCFPGA_N5X_PLLDIV_QDIV_SHIFT	24
+
 #define SOCFPGA_BOOT_CLK		"boot_clk"
 
 #define to_socfpga_clk(p) container_of(p, struct socfpga_pll, hw.hw)
 
+static unsigned long n5x_clk_pll_recalc_rate(struct clk_hw *hwclk,
+						unsigned long parent_rate)
+{
+	struct socfpga_pll *socfpgaclk = to_socfpga_clk(hwclk);
+	unsigned long fdiv, reg, rdiv, qdiv;
+	u32 power = 1;
+
+	/* read VCO1 reg for numerator and denominator */
+	reg = readl(socfpgaclk->hw.reg + 0x8);
+	fdiv = (reg & SOCFPGA_N5X_PLLDIV_FDIV_MASK) >> SOCFPGA_N5X_PLLDIV_FDIV_SHIFT;
+	rdiv = (reg & SOCFPGA_N5X_PLLDIV_RDIV_MASK);
+	qdiv = (reg & SOCFPGA_N5X_PLLDIV_QDIV_MASK) >> SOCFPGA_N5X_PLLDIV_QDIV_SHIFT;
+
+	while (qdiv) {
+		power *= 2;
+		qdiv--;
+	}
+
+	return ((parent_rate * 2 * (fdiv + 1)) / ((rdiv + 1) * power));
+}
+
 static unsigned long agilex_clk_pll_recalc_rate(struct clk_hw *hwclk,
 						unsigned long parent_rate)
 {
@@ -123,7 +150,26 @@ static int clk_pll_prepare(struct clk_hw *hwclk)
 	return 0;
 }
 
-static const struct clk_ops agilex_clk_pll_ops = {
+static int n5x_clk_pll_prepare(struct clk_hw *hwclk)
+{
+	struct socfpga_pll *socfpgaclk = to_socfpga_clk(hwclk);
+	u32 reg;
+
+	/* Bring PLL out of reset */
+	reg = readl(socfpgaclk->hw.reg + 0x4);
+	reg &= ~SOCFPGA_PLL_RESET_MASK;
+	writel(reg, socfpgaclk->hw.reg + 0x4);
+
+	return 0;
+}
+
+static struct clk_ops n5x_clk_pll_ops = {
+	.recalc_rate = n5x_clk_pll_recalc_rate,
+	.get_parent = clk_pll_get_parent,
+	.prepare = n5x_clk_pll_prepare,
+};
+
+static struct clk_ops agilex_clk_pll_ops = {
 	.recalc_rate = agilex_clk_pll_recalc_rate,
 	.get_parent = clk_pll_get_parent,
 	.prepare = clk_pll_prepare,
@@ -214,3 +260,40 @@ struct clk *agilex_register_pll(const struct stratix10_pll_clock *clks,
 	}
 	return clk;
 }
+
+struct clk *n5x_register_pll(const struct stratix10_pll_clock *clks,
+			     void __iomem *reg)
+{
+	struct clk *clk;
+	struct socfpga_pll *pll_clk;
+	struct clk_init_data init;
+	const char *name = clks->name;
+
+	pll_clk = kzalloc(sizeof(*pll_clk), GFP_KERNEL);
+	if (WARN_ON(!pll_clk))
+		return NULL;
+
+	pll_clk->hw.reg = reg + clks->offset;
+
+	if (streq(name, SOCFPGA_BOOT_CLK))
+		init.ops = &clk_boot_ops;
+	else
+		init.ops = &n5x_clk_pll_ops;
+
+	init.name = name;
+	init.flags = clks->flags;
+
+	init.num_parents = clks->num_parents;
+	init.parent_names = NULL;
+	init.parent_data = clks->parent_data;
+	pll_clk->hw.hw.init = &init;
+
+	pll_clk->hw.bit_idx = SOCFPGA_PLL_POWER;
+
+	clk = clk_register(NULL, &pll_clk->hw.hw);
+	if (WARN_ON(IS_ERR(clk))) {
+		kfree(pll_clk);
+		return NULL;
+	}
+	return clk;
+}
diff --git a/drivers/clk/socfpga/stratix10-clk.h b/drivers/clk/socfpga/stratix10-clk.h
index f9d5d724c694..90441c990855 100644
--- a/drivers/clk/socfpga/stratix10-clk.h
+++ b/drivers/clk/socfpga/stratix10-clk.h
@@ -30,6 +30,17 @@ struct stratix10_perip_c_clock {
 	unsigned long		offset;
 };
 
+struct n5x_perip_c_clock {
+	unsigned int		id;
+	const char		*name;
+	const char		*parent_name;
+	const char		*const *parent_names;
+	u8			num_parents;
+	unsigned long		flags;
+	unsigned long		offset;
+	unsigned long		shift;
+};
+
 struct stratix10_perip_cnt_clock {
 	unsigned int		id;
 	const char		*name;
@@ -64,8 +75,12 @@ struct clk *s10_register_pll(const struct stratix10_pll_clock *,
 			     void __iomem *);
 struct clk *agilex_register_pll(const struct stratix10_pll_clock *,
 				void __iomem *);
+struct clk *n5x_register_pll(const struct stratix10_pll_clock *,
+			     void __iomem *);
 struct clk *s10_register_periph(const struct stratix10_perip_c_clock *,
 				void __iomem *);
+struct clk *n5x_register_periph(const struct n5x_perip_c_clock *,
+				void __iomem *);
 struct clk *s10_register_cnt_periph(const struct stratix10_perip_cnt_clock *,
 				    void __iomem *);
 struct clk *s10_register_gate(const struct stratix10_gate_clock *,
-- 
2.30.0