clk: uniphier: add Media I/O clock driver for UniPhier SoCs

This is the initial commit for the UniPhier clock drivers.
Currently, only the Media I/O clock is supported.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

arch/arm/Kconfig

@@ -689,6 +689,7 @@ config TARGET_COLIBRI_PXA270
 
 config ARCH_UNIPHIER
 	bool "Socionext UniPhier SoCs"
+	select CLK_UNIPHIER
 	select CPU_V7
 	select SUPPORT_SPL
 	select SPL

drivers/clk/Kconfig

@@ -20,4 +20,6 @@ config SPL_CLK
 	  setting up clocks within SPL, and allows the same drivers to be
 	  used as U-Boot proper.
 
+source "drivers/clk/uniphier/Kconfig"
+
 endmenu

drivers/clk/Makefile

@@ -10,3 +10,4 @@ obj-$(CONFIG_ROCKCHIP_RK3036) += clk_rk3036.o
 obj-$(CONFIG_ROCKCHIP_RK3288) += clk_rk3288.o
 obj-$(CONFIG_SANDBOX) += clk_sandbox.o
 obj-$(CONFIG_MACH_PIC32) += clk_pic32.o
+obj-$(CONFIG_CLK_UNIPHIER) += uniphier/

drivers/clk/uniphier/Kconfig

@@ -0,0 +1,13 @@
+config CLK_UNIPHIER
+	bool
+	select CLK
+	select SPL_CLK
+
+menu "Clock drivers for UniPhier SoCs"
+	depends on CLK_UNIPHIER
+
+config CLK_UNIPHIER_MIO
+	bool "Clock driver for UniPhier Media I/O block"
+	default y
+
+endmenu

drivers/clk/uniphier/Makefile

@@ -0,0 +1,3 @@
+obj-y					+= clk-uniphier-core.o
+
+obj-$(CONFIG_CLK_UNIPHIER_MIO)		+= clk-uniphier-mio.o

drivers/clk/uniphier/clk-uniphier-core.c

@@ -0,0 +1,159 @@
+/*
+ * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <mapmem.h>
+#include <linux/bitops.h>
+#include <linux/io.h>
+#include <clk.h>
+#include <dm/device.h>
+
+#include "clk-uniphier.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int uniphier_clk_enable(struct udevice *dev, int index)
+{
+	struct uniphier_clk_priv *priv = dev_get_priv(dev);
+	struct uniphier_clk_gate_data *gate = priv->socdata->gate;
+	unsigned int nr_gate = priv->socdata->nr_gate;
+	void __iomem *reg;
+	u32 mask, data, tmp;
+	int i;
+
+	for (i = 0; i < nr_gate; i++) {
+		if (gate[i].index != index)
+			continue;
+
+		reg = priv->base + gate[i].reg;
+		mask = gate[i].mask;
+		data = gate[i].data & mask;
+
+		tmp = readl(reg);
+		tmp &= ~mask;
+		tmp |= data & mask;
+		debug("%s: %p: %08x\n", __func__, reg, tmp);
+		writel(tmp, reg);
+	}
+
+	return 0;
+}
+
+static ulong uniphier_clk_get_rate(struct udevice *dev, int index)
+{
+	struct uniphier_clk_priv *priv = dev_get_priv(dev);
+	struct uniphier_clk_rate_data *rdata = priv->socdata->rate;
+	unsigned int nr_rdata = priv->socdata->nr_rate;
+	void __iomem *reg;
+	u32 mask, data;
+	ulong matched_rate = 0;
+	int i;
+
+	for (i = 0; i < nr_rdata; i++) {
+		if (rdata[i].index != index)
+			continue;
+
+		if (rdata[i].reg == UNIPHIER_CLK_RATE_IS_FIXED)
+			return rdata[i].rate;
+
+		reg = priv->base + rdata[i].reg;
+		mask = rdata[i].mask;
+		data = rdata[i].data & mask;
+		if ((readl(reg) & mask) == data) {
+			if (matched_rate && rdata[i].rate != matched_rate) {
+				printf("failed to get clk rate for insane register values\n");
+				return -EINVAL;
+			}
+			matched_rate = rdata[i].rate;
+		}
+	}
+
+	debug("%s: rate = %lu\n", __func__, matched_rate);
+
+	return matched_rate;
+}
+
+static ulong uniphier_clk_set_rate(struct udevice *dev, int index, ulong rate)
+{
+	struct uniphier_clk_priv *priv = dev_get_priv(dev);
+	struct uniphier_clk_rate_data *rdata = priv->socdata->rate;
+	unsigned int nr_rdata = priv->socdata->nr_rate;
+	void __iomem *reg;
+	u32 mask, data, tmp;
+	ulong best_rate = 0;
+	int i;
+
+	/* first, decide the best match rate */
+	for (i = 0; i < nr_rdata; i++) {
+		if (rdata[i].index != index)
+			continue;
+
+		if (rdata[i].reg == UNIPHIER_CLK_RATE_IS_FIXED)
+			return 0;
+
+		if (rdata[i].rate > best_rate && rdata[i].rate <= rate)
+			best_rate = rdata[i].rate;
+	}
+
+	if (!best_rate)
+		return -ENODEV;
+
+	debug("%s: requested rate = %lu, set rate = %lu\n", __func__,
+	      rate, best_rate);
+
+	/* second, really set registers */
+	for (i = 0; i < nr_rdata; i++) {
+		if (rdata[i].index != index || rdata[i].rate != best_rate)
+			continue;
+
+		reg = priv->base + rdata[i].reg;
+		mask = rdata[i].mask;
+		data = rdata[i].data & mask;
+
+		tmp = readl(reg);
+		tmp &= ~mask;
+		tmp |= data;
+		debug("%s: %p: %08x\n", __func__, reg, tmp);
+		writel(tmp, reg);
+	}
+
+	return best_rate;
+}
+
+const struct clk_ops uniphier_clk_ops = {
+	.enable = uniphier_clk_enable,
+	.get_periph_rate = uniphier_clk_get_rate,
+	.set_periph_rate = uniphier_clk_set_rate,
+};
+
+int uniphier_clk_probe(struct udevice *dev)
+{
+	struct uniphier_clk_priv *priv = dev_get_priv(dev);
+	fdt_addr_t addr;
+	fdt_size_t size;
+
+	addr = fdtdec_get_addr_size(gd->fdt_blob, dev->of_offset, "reg",
+				    &size);
+	if (addr == FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	priv->base = map_sysmem(addr, size);
+	if (!priv->base)
+		return -ENOMEM;
+
+	priv->socdata = (void *)dev_get_driver_data(dev);
+
+	return 0;
+}
+
+int uniphier_clk_remove(struct udevice *dev)
+{
+	struct uniphier_clk_priv *priv = dev_get_priv(dev);
+
+	unmap_sysmem(priv->base);
+
+	return 0;
+}

drivers/clk/uniphier/clk-uniphier-mio.c

@@ -0,0 +1,178 @@
+/*
+ * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <clk.h>
+#include <dm/device.h>
+
+#include "clk-uniphier.h"
+
+#define UNIPHIER_MIO_CLK_GATE_SD(ch, idx)	\
+	{					\
+		.index = (idx),			\
+		.reg = 0x20 + 0x200 * (ch),	\
+		.mask = 0x00000100,		\
+		.data = 0x00000100,		\
+	},					\
+	{					\
+		.index = (idx),			\
+		.reg = 0x110 + 0x200 * (ch),	\
+		.mask = 0x00000001,		\
+		.data = 0x00000001,		\
+	}
+
+#define UNIPHIER_MIO_CLK_RATE_SD(ch, idx)	\
+	{					\
+		.index = (idx),			\
+		.reg = 0x30 + 0x200 * (ch),	\
+		.mask = 0x00031300,		\
+		.data = 0x00000000,		\
+		.rate = 44444444,		\
+	},					\
+	{					\
+		.index = (idx),			\
+		.reg = 0x30 + 0x200 * (ch),	\
+		.mask = 0x00031300,		\
+		.data = 0x00010000,		\
+		.rate = 33333333,		\
+	},					\
+	{					\
+		.index = (idx),			\
+		.reg = 0x30 + 0x200 * (ch),	\
+		.mask = 0x00031300,		\
+		.data = 0x00020000,		\
+		.rate = 50000000,		\
+	},					\
+	{					\
+		.index = (idx),			\
+		.reg = 0x30 + 0x200 * (ch),	\
+		.mask = 0x00031300,		\
+		.data = 0x00020000,		\
+		.rate = 66666666,		\
+	},					\
+	{					\
+		.index = (idx),			\
+		.reg = 0x30 + 0x200 * (ch),	\
+		.mask = 0x00031300,		\
+		.data = 0x00001000,		\
+		.rate = 100000000,		\
+	},					\
+	{					\
+		.index = (idx),			\
+		.reg = 0x30 + 0x200 * (ch),	\
+		.mask = 0x00031300,		\
+		.data = 0x00001100,		\
+		.rate = 40000000,		\
+	},					\
+	{					\
+		.index = (idx),			\
+		.reg = 0x30 + 0x200 * (ch),	\
+		.mask = 0x00031300,		\
+		.data = 0x00001200,		\
+		.rate = 25000000,		\
+	},					\
+	{					\
+		.index = (idx),			\
+		.reg = 0x30 + 0x200 * (ch),	\
+		.mask = 0x00031300,		\
+		.data = 0x00001300,		\
+		.rate = 22222222,		\
+	}
+
+#define UNIPHIER_MIO_CLK_GATE_USB(ch, idx)	\
+	{					\
+		.index = (idx),			\
+		.reg = 0x20 + 0x200 * (ch),	\
+		.mask = 0x30000000,		\
+		.data = 0x30000000,		\
+	},					\
+	{					\
+		.index = (idx),			\
+		.reg = 0x110 + 0x200 * (ch),	\
+		.mask = 0x01000000,		\
+		.data = 0x01000000,		\
+	},					\
+	{					\
+		.index = (idx),			\
+		.reg = 0x114 + 0x200 * (ch),	\
+		.mask = 0x00000001,		\
+		.data = 0x00000001,		\
+	}
+
+#define UNIPHIER_MIO_CLK_GATE_DMAC(idx)		\
+	{					\
+		.index = (idx),			\
+		.reg = 0x20,			\
+		.mask = 0x02000000,		\
+		.data = 0x02000000,		\
+	},					\
+	{					\
+		.index = (idx),			\
+		.reg = 0x110,			\
+		.mask = 0x00020000,		\
+		.data = 0x00020000,		\
+	}
+
+static struct uniphier_clk_gate_data uniphier_mio_clk_gate[] = {
+	UNIPHIER_MIO_CLK_GATE_SD(0, 0),
+	UNIPHIER_MIO_CLK_GATE_SD(1, 1),
+	UNIPHIER_MIO_CLK_GATE_SD(2, 2),		/* for PH1-Pro4 only */
+	UNIPHIER_MIO_CLK_GATE_USB(0, 3),
+	UNIPHIER_MIO_CLK_GATE_USB(1, 4),
+	UNIPHIER_MIO_CLK_GATE_USB(2, 5),
+	UNIPHIER_MIO_CLK_GATE_DMAC(6),
+	UNIPHIER_MIO_CLK_GATE_USB(3, 7),	/* for PH1-sLD3 only */
+};
+
+static struct uniphier_clk_rate_data uniphier_mio_clk_rate[] = {
+	UNIPHIER_MIO_CLK_RATE_SD(0, 0),
+	UNIPHIER_MIO_CLK_RATE_SD(1, 1),
+	UNIPHIER_MIO_CLK_RATE_SD(2, 2),		/* for PH1-Pro4 only */
+};
+
+static struct uniphier_clk_soc_data uniphier_mio_clk_data = {
+	.gate = uniphier_mio_clk_gate,
+	.nr_gate = ARRAY_SIZE(uniphier_mio_clk_gate),
+	.rate = uniphier_mio_clk_rate,
+	.nr_rate = ARRAY_SIZE(uniphier_mio_clk_rate),
+};
+
+static const struct udevice_id uniphier_mio_clk_match[] = {
+	{
+		.compatible = "socionext,ph1-sld3-mioctrl",
+		.data = (ulong)&uniphier_mio_clk_data,
+	},
+	{
+		.compatible = "socionext,ph1-ld4-mioctrl",
+		.data = (ulong)&uniphier_mio_clk_data,
+	},
+	{
+		.compatible = "socionext,ph1-pro4-mioctrl",
+		.data = (ulong)&uniphier_mio_clk_data,
+	},
+	{
+		.compatible = "socionext,ph1-sld8-mioctrl",
+		.data = (ulong)&uniphier_mio_clk_data,
+	},
+	{
+		.compatible = "socionext,ph1-pro5-mioctrl",
+		.data = (ulong)&uniphier_mio_clk_data,
+	},
+	{
+		.compatible = "socionext,proxstream2-mioctrl",
+		.data = (ulong)&uniphier_mio_clk_data,
+	},
+	{ /* sentinel */ }
+};
+
+U_BOOT_DRIVER(uniphier_mio_clk) = {
+	.name = "uniphier-mio-clk",
+	.id = UCLASS_CLK,
+	.of_match = uniphier_mio_clk_match,
+	.probe = uniphier_clk_probe,
+	.remove = uniphier_clk_remove,
+	.priv_auto_alloc_size = sizeof(struct uniphier_clk_priv),
+	.ops = &uniphier_clk_ops,
+};

drivers/clk/uniphier/clk-uniphier.h

@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __CLK_UNIPHIER_H__
+#define __CLK_UNIPHIER_H__
+
+#include <linux/kernel.h>
+
+struct uniphier_clk_gate_data {
+	int index;
+	unsigned int reg;
+	u32 mask;
+	u32 data;
+};
+
+struct uniphier_clk_rate_data {
+	int index;
+	unsigned int reg;
+#define UNIPHIER_CLK_RATE_IS_FIXED		UINT_MAX
+	u32 mask;
+	u32 data;
+	unsigned long rate;
+};
+
+struct uniphier_clk_soc_data {
+	struct uniphier_clk_gate_data *gate;
+	unsigned int nr_gate;
+	struct uniphier_clk_rate_data *rate;
+	unsigned int nr_rate;
+};
+
+#define UNIPHIER_CLK_FIXED_RATE(i, f)			\
+	{						\
+		.index = i,				\
+		.reg = UNIPHIER_CLK_RATE_IS_FIXED,	\
+		.rate = f,				\
+	}
+
+/**
+ * struct uniphier_clk_priv - private data for UniPhier clock driver
+ *
+ * @base: base address of the clock provider
+ * @socdata: SoC specific data
+ */
+struct uniphier_clk_priv {
+	void __iomem *base;
+	struct uniphier_clk_soc_data *socdata;
+};
+
+extern const struct clk_ops uniphier_clk_ops;
+int uniphier_clk_probe(struct udevice *dev);
+int uniphier_clk_remove(struct udevice *dev);
+
+#endif /* __CLK_UNIPHIER_H__ */