clk: renesas: Add Gen2 clock core

Add common clock code for Renesas RCar Gen2 platforms.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

5 files changed, 339 insertions, 0 deletions

diff --git a/drivers/clk/renesas/Kconfig b/drivers/clk/renesas/Kconfig
index d805f8b36e..a7aa565fb8 100644
--- a/drivers/clk/renesas/Kconfig
+++ b/drivers/clk/renesas/Kconfig
@@ -4,6 +4,13 @@ config CLK_RENESAS
 	help
 	  Enable support for clock present on Renesas RCar SoCs.
 
+config CLK_RCAR_GEN2
+	bool "Renesas RCar Gen2 clock driver"
+	def_bool y if RCAR_32
+	depends on CLK_RENESAS
+	help
+	  Enable this to support the clocks on Renesas RCar Gen2 SoC.
+
 config CLK_RCAR_GEN3
 	bool "Renesas RCar Gen3 clock driver"
 	def_bool y if RCAR_GEN3
diff --git a/drivers/clk/renesas/Makefile b/drivers/clk/renesas/Makefile
index 4be9852729..14105a0da4 100644
--- a/drivers/clk/renesas/Makefile
+++ b/drivers/clk/renesas/Makefile
@@ -1,4 +1,5 @@
 obj-$(CONFIG_CLK_RENESAS) += renesas-cpg-mssr.o
+obj-$(CONFIG_CLK_RCAR_GEN2) += clk-rcar-gen2.o
 obj-$(CONFIG_CLK_RCAR_GEN3) += clk-rcar-gen3.o
 obj-$(CONFIG_CLK_R8A7795) += r8a7795-cpg-mssr.o
 obj-$(CONFIG_CLK_R8A7796) += r8a7796-cpg-mssr.o
diff --git a/drivers/clk/renesas/clk-rcar-gen2.c b/drivers/clk/renesas/clk-rcar-gen2.c
new file mode 100644
index 0000000000..f65b18c7f6
--- /dev/null
+++ b/drivers/clk/renesas/clk-rcar-gen2.c
@@ -0,0 +1,279 @@
+/*
+ * Renesas RCar Gen2 CPG MSSR driver
+ *
+ * Copyright (C) 2017 Marek Vasut <marek.vasut@gmail.com>
+ *
+ * Based on the following driver from Linux kernel:
+ * r8a7796 Clock Pulse Generator / Module Standby and Software Reset
+ *
+ * Copyright (C) 2016 Glider bvba
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <clk-uclass.h>
+#include <dm.h>
+#include <errno.h>
+#include <asm/io.h>
+
+#include <dt-bindings/clock/renesas-cpg-mssr.h>
+
+#include "renesas-cpg-mssr.h"
+#include "rcar-gen2-cpg.h"
+
+#define CPG_RST_MODEMR		0x0060
+
+#define CPG_PLL0CR		0x00d8
+#define CPG_SDCKCR		0x0074
+
+struct clk_div_table {
+	u8	val;
+	u8	div;
+};
+
+/* SDHI divisors */
+static const struct clk_div_table cpg_sdh_div_table[] = {
+	{  0,  2 }, {  1,  3 }, {  2,  4 }, {  3,  6 },
+	{  4,  8 }, {  5, 12 }, {  6, 16 }, {  7, 18 },
+	{  8, 24 }, { 10, 36 }, { 11, 48 }, {  0,  0 },
+};
+
+static const struct clk_div_table cpg_sd01_div_table[] = {
+	{  4,  8 }, {  5, 12 }, {  6, 16 }, {  7, 18 },
+	{  8, 24 }, { 10, 36 }, { 11, 48 }, { 12, 10 },
+	{  0,  0 },
+};
+
+static u8 gen2_clk_get_sdh_div(const struct clk_div_table *table, u8 div)
+{
+	while ((*table++).val) {
+		if ((*table).div == div)
+			return div;
+	}
+	return 0xff;
+}
+
+static int gen2_clk_enable(struct clk *clk)
+{
+	struct gen2_clk_priv *priv = dev_get_priv(clk->dev);
+
+	return renesas_clk_endisable(clk, priv->base, true);
+}
+
+static int gen2_clk_disable(struct clk *clk)
+{
+	struct gen2_clk_priv *priv = dev_get_priv(clk->dev);
+
+	return renesas_clk_endisable(clk, priv->base, false);
+}
+
+static ulong gen2_clk_get_rate(struct clk *clk)
+{
+	struct gen2_clk_priv *priv = dev_get_priv(clk->dev);
+	struct cpg_mssr_info *info = priv->info;
+	struct clk parent;
+	const struct cpg_core_clk *core;
+	const struct rcar_gen2_cpg_pll_config *pll_config =
+					priv->cpg_pll_config;
+	u32 value, mult, div, rate = 0;
+	int ret;
+
+	debug("%s[%i] Clock: id=%lu\n", __func__, __LINE__, clk->id);
+
+	ret = renesas_clk_get_parent(clk, info, &parent);
+	if (ret) {
+		printf("%s[%i] parent fail, ret=%i\n", __func__, __LINE__, ret);
+		return ret;
+	}
+
+	if (renesas_clk_is_mod(clk)) {
+		rate = gen2_clk_get_rate(&parent);
+		debug("%s[%i] MOD clk: parent=%lu => rate=%u\n",
+		      __func__, __LINE__, parent.id, rate);
+		return rate;
+	}
+
+	ret = renesas_clk_get_core(clk, info, &core);
+	if (ret)
+		return ret;
+
+	switch (core->type) {
+	case CLK_TYPE_IN:
+		if (core->id == info->clk_extal_id) {
+			rate = clk_get_rate(&priv->clk_extal);
+			debug("%s[%i] EXTAL clk: rate=%u\n",
+			      __func__, __LINE__, rate);
+			return rate;
+		}
+
+		if (core->id == info->clk_extal_usb_id) {
+			rate = clk_get_rate(&priv->clk_extal_usb);
+			debug("%s[%i] EXTALR clk: rate=%u\n",
+			      __func__, __LINE__, rate);
+			return rate;
+		}
+
+		return -EINVAL;
+
+	case CLK_TYPE_FF:
+		rate = (gen2_clk_get_rate(&parent) * core->mult) / core->div;
+		debug("%s[%i] FIXED clk: parent=%i div=%i mul=%i => rate=%u\n",
+		      __func__, __LINE__,
+		      core->parent, core->mult, core->div, rate);
+		return rate;
+
+	case CLK_TYPE_DIV6P1:	/* DIV6 Clock with 1 parent clock */
+		value = (readl(priv->base + core->offset) & 0x3f) + 1;
+		rate = gen2_clk_get_rate(&parent) / value;
+		debug("%s[%i] DIV6P1 clk: parent=%i div=%i => rate=%u\n",
+		      __func__, __LINE__,
+		      core->parent, value, rate);
+		return rate;
+
+	case CLK_TYPE_GEN2_MAIN:
+		rate = gen2_clk_get_rate(&parent) / pll_config->extal_div;
+		debug("%s[%i] MAIN clk: parent=%i extal_div=%i => rate=%u\n",
+		      __func__, __LINE__,
+		      core->parent, pll_config->extal_div, rate);
+		return rate;
+
+	case CLK_TYPE_GEN2_PLL0:
+		/*
+		 * PLL0 is a  configurable multiplier clock except on R-Car
+		 * V2H/E2. Register the PLL0 clock as a fixed factor clock for
+		 * now as there's no generic multiplier clock implementation and
+		 * we  currently  have no need to change  the multiplier value.
+		 */
+		mult = pll_config->pll0_mult;
+		if (!mult) {
+			value = readl(priv->base + CPG_PLL0CR);
+			mult = (((value >> 24) & 0x7f) + 1) * 2;
+		}
+
+		rate = (gen2_clk_get_rate(&parent) * mult) / info->pll0_div;
+		debug("%s[%i] PLL0 clk: parent=%i mult=%u => rate=%u\n",
+		      __func__, __LINE__, core->parent, mult, rate);
+		return rate;
+
+	case CLK_TYPE_GEN2_PLL1:
+		rate = (gen2_clk_get_rate(&parent) * pll_config->pll1_mult) / 2;
+		debug("%s[%i] PLL1 clk: parent=%i mul=%i => rate=%u\n",
+		      __func__, __LINE__,
+		      core->parent, pll_config->pll1_mult, rate);
+		return rate;
+
+	case CLK_TYPE_GEN2_PLL3:
+		rate = gen2_clk_get_rate(&parent) * pll_config->pll3_mult;
+		debug("%s[%i] PLL3 clk: parent=%i mul=%i => rate=%u\n",
+		      __func__, __LINE__,
+		      core->parent, pll_config->pll3_mult, rate);
+		return rate;
+
+	case CLK_TYPE_GEN2_SDH:
+		value = (readl(priv->base + CPG_SDCKCR) >> 8) & 0xf;
+		div = gen2_clk_get_sdh_div(cpg_sdh_div_table, value);
+		rate = gen2_clk_get_rate(&parent) / div;
+		debug("%s[%i] SDH clk: parent=%i div=%i => rate=%u\n",
+		      __func__, __LINE__,
+		      core->parent, div, rate);
+		return rate;
+
+	case CLK_TYPE_GEN2_SD0:
+		value = (readl(priv->base + CPG_SDCKCR) >> 4) & 0xf;
+		div = gen2_clk_get_sdh_div(cpg_sd01_div_table, value);
+		rate = gen2_clk_get_rate(&parent) / div;
+		debug("%s[%i] SD0 clk: parent=%i div=%i => rate=%u\n",
+		      __func__, __LINE__,
+		      core->parent, div, rate);
+		return rate;
+
+	case CLK_TYPE_GEN2_SD1:
+		value = (readl(priv->base + CPG_SDCKCR) >> 0) & 0xf;
+		div = gen2_clk_get_sdh_div(cpg_sd01_div_table, value);
+		rate = gen2_clk_get_rate(&parent) / div;
+		debug("%s[%i] SD1 clk: parent=%i div=%i => rate=%u\n",
+		      __func__, __LINE__,
+		      core->parent, div, rate);
+		return rate;
+	}
+
+	printf("%s[%i] unknown fail\n", __func__, __LINE__);
+
+	return -ENOENT;
+}
+
+static ulong gen2_clk_set_rate(struct clk *clk, ulong rate)
+{
+	return gen2_clk_get_rate(clk);
+}
+
+static int gen2_clk_of_xlate(struct clk *clk, struct ofnode_phandle_args *args)
+{
+	if (args->args_count != 2) {
+		debug("Invaild args_count: %d\n", args->args_count);
+		return -EINVAL;
+	}
+
+	clk->id = (args->args[0] << 16) | args->args[1];
+
+	return 0;
+}
+
+const struct clk_ops gen2_clk_ops = {
+	.enable		= gen2_clk_enable,
+	.disable	= gen2_clk_disable,
+	.get_rate	= gen2_clk_get_rate,
+	.set_rate	= gen2_clk_set_rate,
+	.of_xlate	= gen2_clk_of_xlate,
+};
+
+int gen2_clk_probe(struct udevice *dev)
+{
+	struct gen2_clk_priv *priv = dev_get_priv(dev);
+	struct cpg_mssr_info *info =
+		(struct cpg_mssr_info *)dev_get_driver_data(dev);
+	fdt_addr_t rst_base;
+	u32 cpg_mode;
+	int ret;
+
+	priv->base = (struct gen2_base *)devfdt_get_addr(dev);
+	if (!priv->base)
+		return -EINVAL;
+
+	priv->info = info;
+	ret = fdt_node_offset_by_compatible(gd->fdt_blob, -1, info->reset_node);
+	if (ret < 0)
+		return ret;
+
+	rst_base = fdtdec_get_addr(gd->fdt_blob, ret, "reg");
+	if (rst_base == FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	cpg_mode = readl(rst_base + CPG_RST_MODEMR);
+
+	priv->cpg_pll_config =
+		(struct rcar_gen2_cpg_pll_config *)info->get_pll_config(cpg_mode);
+	if (!priv->cpg_pll_config->extal_div)
+		return -EINVAL;
+
+	ret = clk_get_by_name(dev, "extal", &priv->clk_extal);
+	if (ret < 0)
+		return ret;
+
+	if (info->extal_usb_node) {
+		ret = clk_get_by_name(dev, info->extal_usb_node,
+				      &priv->clk_extal_usb);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+int gen2_clk_remove(struct udevice *dev)
+{
+	struct gen2_clk_priv *priv = dev_get_priv(dev);
+
+	return renesas_clk_remove(priv->base, priv->info);
+}
diff --git a/drivers/clk/renesas/rcar-gen2-cpg.h b/drivers/clk/renesas/rcar-gen2-cpg.h
new file mode 100644
index 0000000000..913c932620
--- /dev/null
+++ b/drivers/clk/renesas/rcar-gen2-cpg.h
@@ -0,0 +1,49 @@
+/*
+ * R-Car Gen2 Clock Pulse Generator
+ *
+ * Copyright (C) 2016 Cogent Embedded Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation; version 2 of the License.
+ */
+
+#ifndef __CLK_RENESAS_RCAR_GEN2_CPG_H__
+#define __CLK_RENESAS_RCAR_GEN2_CPG_H__
+
+enum rcar_gen2_clk_types {
+	CLK_TYPE_GEN2_MAIN = CLK_TYPE_CUSTOM,
+	CLK_TYPE_GEN2_PLL0,
+	CLK_TYPE_GEN2_PLL1,
+	CLK_TYPE_GEN2_PLL3,
+	CLK_TYPE_GEN2_Z,
+	CLK_TYPE_GEN2_LB,
+	CLK_TYPE_GEN2_ADSP,
+	CLK_TYPE_GEN2_SDH,
+	CLK_TYPE_GEN2_SD0,
+	CLK_TYPE_GEN2_SD1,
+	CLK_TYPE_GEN2_QSPI,
+	CLK_TYPE_GEN2_RCAN,
+};
+
+struct rcar_gen2_cpg_pll_config {
+	unsigned int extal_div;
+	unsigned int pll1_mult;
+	unsigned int pll3_mult;
+	unsigned int pll0_mult;		/* leave as zero if PLL0CR exists */
+};
+
+struct gen2_clk_priv {
+	void __iomem		*base;
+	struct cpg_mssr_info	*info;
+	struct clk		clk_extal;
+	struct clk		clk_extal_usb;
+	const struct rcar_gen2_cpg_pll_config *cpg_pll_config;
+};
+
+int gen2_clk_probe(struct udevice *dev);
+int gen2_clk_remove(struct udevice *dev);
+
+extern const struct clk_ops gen2_clk_ops;
+
+#endif
diff --git a/drivers/clk/renesas/renesas-cpg-mssr.h b/drivers/clk/renesas/renesas-cpg-mssr.h
index 2bd98bc510..c19a466be1 100644
--- a/drivers/clk/renesas/renesas-cpg-mssr.h
+++ b/drivers/clk/renesas/renesas-cpg-mssr.h
@@ -23,9 +23,12 @@ struct cpg_mssr_info {
 	unsigned int			mstp_table_size;
 	const char			*reset_node;
 	const char			*extalr_node;
+	const char			*extal_usb_node;
 	unsigned int			mod_clk_base;
 	unsigned int			clk_extal_id;
 	unsigned int			clk_extalr_id;
+	unsigned int			clk_extal_usb_id;
+	unsigned int			pll0_div;
 	const void			*(*get_pll_config)(const u32 cpg_mode);
 };