[deliverable/linux.git] / drivers / clk / samsung / clk-exynos5440.c

/*
 * Copyright (c) 2013 Samsung Electronics Co., Ltd.
 * Author: Thomas Abraham <thomas.ab@samsung.com>
 *
 * 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.
 *
 * Common Clock Framework support for Exynos5440 SoC.
*/

#include <dt-bindings/clock/exynos5440.h>
#include <linux/clk-provider.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/notifier.h>
#include <linux/reboot.h>

#include "clk.h"
#include "clk-pll.h"

#define CLKEN_OV_VAL		0xf8
#define CPU_CLK_STATUS		0xfc
#define MISC_DOUT1		0x558

static void __iomem *reg_base;

/* parent clock name list */
PNAME(mout_armclk_p)	= { "cplla", "cpllb" };
PNAME(mout_spi_p)	= { "div125", "div200" };

/* fixed rate clocks generated outside the soc */
static struct samsung_fixed_rate_clock exynos5440_fixed_rate_ext_clks[] __initdata = {
	FRATE(0, "xtal", NULL, CLK_IS_ROOT, 0),
};

/* fixed rate clocks */
static struct samsung_fixed_rate_clock exynos5440_fixed_rate_clks[] __initdata = {
	FRATE(0, "ppll", NULL, CLK_IS_ROOT, 1000000000),
	FRATE(0, "usb_phy0", NULL, CLK_IS_ROOT, 60000000),
	FRATE(0, "usb_phy1", NULL, CLK_IS_ROOT, 60000000),
	FRATE(0, "usb_ohci12", NULL, CLK_IS_ROOT, 12000000),
	FRATE(0, "usb_ohci48", NULL, CLK_IS_ROOT, 48000000),
};

/* fixed factor clocks */
static struct samsung_fixed_factor_clock exynos5440_fixed_factor_clks[] __initdata = {
	FFACTOR(0, "div250", "ppll", 1, 4, 0),
	FFACTOR(0, "div200", "ppll", 1, 5, 0),
	FFACTOR(0, "div125", "div250", 1, 2, 0),
};

/* mux clocks */
static struct samsung_mux_clock exynos5440_mux_clks[] __initdata = {
	MUX(0, "mout_spi", mout_spi_p, MISC_DOUT1, 5, 1),
	MUX_A(CLK_ARM_CLK, "arm_clk", mout_armclk_p,
			CPU_CLK_STATUS, 0, 1, "armclk"),
};

/* divider clocks */
static struct samsung_div_clock exynos5440_div_clks[] __initdata = {
	DIV(CLK_SPI_BAUD, "div_spi", "mout_spi", MISC_DOUT1, 3, 2),
};

/* gate clocks */
static struct samsung_gate_clock exynos5440_gate_clks[] __initdata = {
	GATE(CLK_PB0_250, "pb0_250", "div250", CLKEN_OV_VAL, 3, 0, 0),
	GATE(CLK_PR0_250, "pr0_250", "div250", CLKEN_OV_VAL, 4, 0, 0),
	GATE(CLK_PR1_250, "pr1_250", "div250", CLKEN_OV_VAL, 5, 0, 0),
	GATE(CLK_B_250, "b_250", "div250", CLKEN_OV_VAL, 9, 0, 0),
	GATE(CLK_B_125, "b_125", "div125", CLKEN_OV_VAL, 10, 0, 0),
	GATE(CLK_B_200, "b_200", "div200", CLKEN_OV_VAL, 11, 0, 0),
	GATE(CLK_SATA, "sata", "div200", CLKEN_OV_VAL, 12, 0, 0),
	GATE(CLK_USB, "usb", "div200", CLKEN_OV_VAL, 13, 0, 0),
	GATE(CLK_GMAC0, "gmac0", "div200", CLKEN_OV_VAL, 14, 0, 0),
	GATE(CLK_CS250, "cs250", "div250", CLKEN_OV_VAL, 19, 0, 0),
	GATE(CLK_PB0_250_O, "pb0_250_o", "pb0_250", CLKEN_OV_VAL, 3, 0, 0),
	GATE(CLK_PR0_250_O, "pr0_250_o", "pr0_250", CLKEN_OV_VAL, 4, 0, 0),
	GATE(CLK_PR1_250_O, "pr1_250_o", "pr1_250", CLKEN_OV_VAL, 5, 0, 0),
	GATE(CLK_B_250_O, "b_250_o", "b_250", CLKEN_OV_VAL, 9, 0, 0),
	GATE(CLK_B_125_O, "b_125_o", "b_125", CLKEN_OV_VAL, 10, 0, 0),
	GATE(CLK_B_200_O, "b_200_o", "b_200", CLKEN_OV_VAL, 11, 0, 0),
	GATE(CLK_SATA_O, "sata_o", "sata", CLKEN_OV_VAL, 12, 0, 0),
	GATE(CLK_USB_O, "usb_o", "usb", CLKEN_OV_VAL, 13, 0, 0),
	GATE(CLK_GMAC0_O, "gmac0_o", "gmac", CLKEN_OV_VAL, 14, 0, 0),
	GATE(CLK_CS250_O, "cs250_o", "cs250", CLKEN_OV_VAL, 19, 0, 0),
};

static const struct of_device_id ext_clk_match[] __initconst = {
	{ .compatible = "samsung,clock-xtal", .data = (void *)0, },
	{},
};

static int exynos5440_clk_restart_notify(struct notifier_block *this,
		unsigned long code, void *unused)
{
	u32 val, status;

	status = readl_relaxed(reg_base + 0xbc);
	val = readl_relaxed(reg_base + 0xcc);
	val = (val & 0xffff0000) | (status & 0xffff);
	writel_relaxed(val, reg_base + 0xcc);

	return NOTIFY_DONE;
}

/*
 * Exynos5440 Clock restart notifier, handles restart functionality
 */
static struct notifier_block exynos5440_clk_restart_handler = {
	.notifier_call = exynos5440_clk_restart_notify,
	.priority = 128,
};

/* register exynos5440 clocks */
static void __init exynos5440_clk_init(struct device_node *np)
{
	struct samsung_clk_provider *ctx;

	reg_base = of_iomap(np, 0);
	if (!reg_base) {
		pr_err("%s: failed to map clock controller registers,"
			" aborting clock initialization\n", __func__);
		return;
	}

	ctx = samsung_clk_init(np, reg_base, CLK_NR_CLKS);
	if (!ctx)
		panic("%s: unable to allocate context.\n", __func__);

	samsung_clk_of_register_fixed_ext(ctx, exynos5440_fixed_rate_ext_clks,
		ARRAY_SIZE(exynos5440_fixed_rate_ext_clks), ext_clk_match);

	samsung_clk_register_pll2550x("cplla", "xtal", reg_base + 0x1c, 0x10);
	samsung_clk_register_pll2550x("cpllb", "xtal", reg_base + 0x20, 0x10);

	samsung_clk_register_fixed_rate(ctx, exynos5440_fixed_rate_clks,
			ARRAY_SIZE(exynos5440_fixed_rate_clks));
	samsung_clk_register_fixed_factor(ctx, exynos5440_fixed_factor_clks,
			ARRAY_SIZE(exynos5440_fixed_factor_clks));
	samsung_clk_register_mux(ctx, exynos5440_mux_clks,
			ARRAY_SIZE(exynos5440_mux_clks));
	samsung_clk_register_div(ctx, exynos5440_div_clks,
			ARRAY_SIZE(exynos5440_div_clks));
	samsung_clk_register_gate(ctx, exynos5440_gate_clks,
			ARRAY_SIZE(exynos5440_gate_clks));

	samsung_clk_of_add_provider(np, ctx);

	if (register_restart_handler(&exynos5440_clk_restart_handler))
		pr_warn("exynos5440 clock can't register restart handler\n");

	pr_info("Exynos5440: arm_clk = %ldHz\n", _get_rate("arm_clk"));
	pr_info("exynos5440 clock initialization complete\n");
}
CLK_OF_DECLARE(exynos5440_clk, "samsung,exynos5440-clock", exynos5440_clk_init);
Commit	Line	Data
f2585b1c TA	1	/*
	2	* Copyright (c) 2013 Samsung Electronics Co., Ltd.
	3	* Author: Thomas Abraham <thomas.ab@samsung.com>
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*
	9	* Common Clock Framework support for Exynos5440 SoC.
	10	*/
	11
ad3ab455	12	#include <dt-bindings/clock/exynos5440.h>
f2585b1c TA	13	#include <linux/clk-provider.h>
	14	#include <linux/of.h>
	15	#include <linux/of_address.h>
5e6473f4 PD	16	#include <linux/notifier.h>
5e6473f4 PD	17	#include <linux/reboot.h>
f2585b1c	18
f2585b1c TA	19	#include "clk.h"
	20	#include "clk-pll.h"
	21
	22	#define CLKEN_OV_VAL 0xf8
	23	#define CPU_CLK_STATUS 0xfc
	24	#define MISC_DOUT1 0x558
	25
5e6473f4 PD	26	static void __iomem *reg_base;
5e6473f4 PD	27
f2585b1c TA	28	/* parent clock name list */
	29	PNAME(mout_armclk_p) = { "cplla", "cpllb" };
	30	PNAME(mout_spi_p) = { "div125", "div200" };
	31
	32	/* fixed rate clocks generated outside the soc */
901f8576	33	static struct samsung_fixed_rate_clock exynos5440_fixed_rate_ext_clks[] __initdata = {
ad3ab455	34	FRATE(0, "xtal", NULL, CLK_IS_ROOT, 0),
f2585b1c TA	35	};
	36
	37	/* fixed rate clocks */
901f8576	38	static struct samsung_fixed_rate_clock exynos5440_fixed_rate_clks[] __initdata = {
ad3ab455 AH	39	FRATE(0, "ppll", NULL, CLK_IS_ROOT, 1000000000),
	40	FRATE(0, "usb_phy0", NULL, CLK_IS_ROOT, 60000000),
	41	FRATE(0, "usb_phy1", NULL, CLK_IS_ROOT, 60000000),
	42	FRATE(0, "usb_ohci12", NULL, CLK_IS_ROOT, 12000000),
	43	FRATE(0, "usb_ohci48", NULL, CLK_IS_ROOT, 48000000),
f2585b1c TA	44	};
	45
	46	/* fixed factor clocks */
901f8576	47	static struct samsung_fixed_factor_clock exynos5440_fixed_factor_clks[] __initdata = {
ad3ab455 AH	48	FFACTOR(0, "div250", "ppll", 1, 4, 0),
	49	FFACTOR(0, "div200", "ppll", 1, 5, 0),
	50	FFACTOR(0, "div125", "div250", 1, 2, 0),
f2585b1c TA	51	};
	52
	53	/* mux clocks */
901f8576	54	static struct samsung_mux_clock exynos5440_mux_clks[] __initdata = {
ad3ab455 AH	55	MUX(0, "mout_spi", mout_spi_p, MISC_DOUT1, 5, 1),
ad3ab455 AH	56	MUX_A(CLK_ARM_CLK, "arm_clk", mout_armclk_p,
f2585b1c TA	57	CPU_CLK_STATUS, 0, 1, "armclk"),
	58	};
	59
	60	/* divider clocks */
901f8576	61	static struct samsung_div_clock exynos5440_div_clks[] __initdata = {
ad3ab455	62	DIV(CLK_SPI_BAUD, "div_spi", "mout_spi", MISC_DOUT1, 3, 2),
f2585b1c TA	63	};
	64
	65	/* gate clocks */
901f8576	66	static struct samsung_gate_clock exynos5440_gate_clks[] __initdata = {
ad3ab455 AH	67	GATE(CLK_PB0_250, "pb0_250", "div250", CLKEN_OV_VAL, 3, 0, 0),
	68	GATE(CLK_PR0_250, "pr0_250", "div250", CLKEN_OV_VAL, 4, 0, 0),
	69	GATE(CLK_PR1_250, "pr1_250", "div250", CLKEN_OV_VAL, 5, 0, 0),
	70	GATE(CLK_B_250, "b_250", "div250", CLKEN_OV_VAL, 9, 0, 0),
	71	GATE(CLK_B_125, "b_125", "div125", CLKEN_OV_VAL, 10, 0, 0),
	72	GATE(CLK_B_200, "b_200", "div200", CLKEN_OV_VAL, 11, 0, 0),
	73	GATE(CLK_SATA, "sata", "div200", CLKEN_OV_VAL, 12, 0, 0),
	74	GATE(CLK_USB, "usb", "div200", CLKEN_OV_VAL, 13, 0, 0),
	75	GATE(CLK_GMAC0, "gmac0", "div200", CLKEN_OV_VAL, 14, 0, 0),
	76	GATE(CLK_CS250, "cs250", "div250", CLKEN_OV_VAL, 19, 0, 0),
	77	GATE(CLK_PB0_250_O, "pb0_250_o", "pb0_250", CLKEN_OV_VAL, 3, 0, 0),
	78	GATE(CLK_PR0_250_O, "pr0_250_o", "pr0_250", CLKEN_OV_VAL, 4, 0, 0),
	79	GATE(CLK_PR1_250_O, "pr1_250_o", "pr1_250", CLKEN_OV_VAL, 5, 0, 0),
	80	GATE(CLK_B_250_O, "b_250_o", "b_250", CLKEN_OV_VAL, 9, 0, 0),
	81	GATE(CLK_B_125_O, "b_125_o", "b_125", CLKEN_OV_VAL, 10, 0, 0),
	82	GATE(CLK_B_200_O, "b_200_o", "b_200", CLKEN_OV_VAL, 11, 0, 0),
	83	GATE(CLK_SATA_O, "sata_o", "sata", CLKEN_OV_VAL, 12, 0, 0),
	84	GATE(CLK_USB_O, "usb_o", "usb", CLKEN_OV_VAL, 13, 0, 0),
	85	GATE(CLK_GMAC0_O, "gmac0_o", "gmac", CLKEN_OV_VAL, 14, 0, 0),
	86	GATE(CLK_CS250_O, "cs250_o", "cs250", CLKEN_OV_VAL, 19, 0, 0),
f2585b1c TA	87	};
f2585b1c TA	88
305cfab0	89	static const struct of_device_id ext_clk_match[] __initconst = {
f2585b1c TA	90	{ .compatible = "samsung,clock-xtal", .data = (void *)0, },
	91	{},
	92	};
	93
5e6473f4 PD	94	static int exynos5440_clk_restart_notify(struct notifier_block *this,
	95	unsigned long code, void *unused)
	96	{
	97	u32 val, status;
	98
	99	status = readl_relaxed(reg_base + 0xbc);
	100	val = readl_relaxed(reg_base + 0xcc);
	101	val = (val & 0xffff0000) \| (status & 0xffff);
	102	writel_relaxed(val, reg_base + 0xcc);
	103
	104	return NOTIFY_DONE;
	105	}
	106
	107	/*
	108	* Exynos5440 Clock restart notifier, handles restart functionality
	109	*/
	110	static struct notifier_block exynos5440_clk_restart_handler = {
	111	.notifier_call = exynos5440_clk_restart_notify,
	112	.priority = 128,
	113	};
	114
f2585b1c	115	/* register exynos5440 clocks */
901f8576	116	static void __init exynos5440_clk_init(struct device_node *np)
f2585b1c	117	{
976face4	118	struct samsung_clk_provider *ctx;
f2585b1c TA	119
	120	reg_base = of_iomap(np, 0);
	121	if (!reg_base) {
	122	pr_err("%s: failed to map clock controller registers,"
	123	" aborting clock initialization\n", __func__);
	124	return;
	125	}
	126
976face4 RS	127	ctx = samsung_clk_init(np, reg_base, CLK_NR_CLKS);
	128	if (!ctx)
	129	panic("%s: unable to allocate context.\n", __func__);
	130
	131	samsung_clk_of_register_fixed_ext(ctx, exynos5440_fixed_rate_ext_clks,
f2585b1c TA	132	ARRAY_SIZE(exynos5440_fixed_rate_ext_clks), ext_clk_match);
	133
	134	samsung_clk_register_pll2550x("cplla", "xtal", reg_base + 0x1c, 0x10);
	135	samsung_clk_register_pll2550x("cpllb", "xtal", reg_base + 0x20, 0x10);
	136
976face4	137	samsung_clk_register_fixed_rate(ctx, exynos5440_fixed_rate_clks,
f2585b1c	138	ARRAY_SIZE(exynos5440_fixed_rate_clks));
976face4	139	samsung_clk_register_fixed_factor(ctx, exynos5440_fixed_factor_clks,
f2585b1c	140	ARRAY_SIZE(exynos5440_fixed_factor_clks));
976face4	141	samsung_clk_register_mux(ctx, exynos5440_mux_clks,
f2585b1c	142	ARRAY_SIZE(exynos5440_mux_clks));
976face4	143	samsung_clk_register_div(ctx, exynos5440_div_clks,
f2585b1c	144	ARRAY_SIZE(exynos5440_div_clks));
976face4	145	samsung_clk_register_gate(ctx, exynos5440_gate_clks,
f2585b1c TA	146	ARRAY_SIZE(exynos5440_gate_clks));
f2585b1c TA	147
d5e136a2 SN	148	samsung_clk_of_add_provider(np, ctx);
d5e136a2 SN	149
5e6473f4 PD	150	if (register_restart_handler(&exynos5440_clk_restart_handler))
	151	pr_warn("exynos5440 clock can't register restart handler\n");
	152
3a647895	153	pr_info("Exynos5440: arm_clk = %ldHz\n", _get_rate("arm_clk"));
f2585b1c TA	154	pr_info("exynos5440 clock initialization complete\n");
	155	}
	156	CLK_OF_DECLARE(exynos5440_clk, "samsung,exynos5440-clock", exynos5440_clk_init);