clk: hisilicon: add CRG driver for hi3519 soc

* Hisilicon Hi3519 Clock and Reset Generator(CRG)

The Hi3519 CRG module provides clock and reset signals to various

controllers within the SoC.

This binding uses the following bindings:

    Documentation/devicetree/bindings/clock/clock-bindings.txt

    Documentation/devicetree/bindings/reset/reset.txt

Required Properties:

- compatible: should be one of the following.

  - "hisilicon,hi3519-crg" - controller compatible with Hi3519 SoC.

- reg: physical base address of the controller and length of memory mapped

  region.

- #clock-cells: should be 1.

Each clock is assigned an identifier and client nodes use this identifier

to specify the clock which they consume.

All these identifier could be found in <dt-bindings/clock/hi3519-clock.h>.

- #reset-cells: should be 2.

A reset signal can be controlled by writing a bit register in the CRG module.

The reset specifier consists of two cells. The first cell represents the

register offset relative to the base address. The second cell represents the

bit index in the register.

Example: CRG nodes

CRG: clock-reset-controller@12010000 {

	compatible = "hisilicon,hi3519-crg";

	reg = <0x12010000 0x10000>;

	#clock-cells = <1>;

	#reset-cells = <2>;

};

Example: consumer nodes

i2c0: i2c@12110000 {

	compatible = "hisilicon,hi3519-i2c";

	reg = <0x12110000 0x1000>;

	clocks = <&CRG HI3519_I2C0_RST>;

	resets = <&CRG 0xe4 0>;

};

config COMMON_CLK_HI3519

	tristate "Hi3519 Clock Driver"

	depends on ARCH_HISI || COMPILE_TEST

	select RESET_HISI

	default ARCH_HISI

	help

	  Build the clock driver for hi3519.

config COMMON_CLK_HI6220

	bool "Hi6220 Clock Driver"

	depends on ARCH_HISI || COMPILE_TEST

obj-$(CONFIG_ARCH_HI3xxx)	+= clk-hi3620.o

obj-$(CONFIG_ARCH_HIP04)	+= clk-hip04.o

obj-$(CONFIG_ARCH_HIX5HD2)	+= clk-hix5hd2.o

obj-$(CONFIG_COMMON_CLK_HI3519)	+= clk-hi3519.o

obj-$(CONFIG_COMMON_CLK_HI6220)	+= clk-hi6220.o

obj-$(CONFIG_RESET_HISI)	+= reset.o

obj-$(CONFIG_STUB_CLK_HI6220)	+= clk-hi6220-stub.o

/*

 * Hi3519 Clock Driver

 *

 * Copyright (c) 2015-2016 HiSilicon Technologies Co., Ltd.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program. If not, see <http://www.gnu.org/licenses/>.

 */

#include <dt-bindings/clock/hi3519-clock.h>

#include <linux/clk-provider.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include "clk.h"

#include "reset.h"

#define HI3519_INNER_CLK_OFFSET	64

#define HI3519_FIXED_24M	65

#define HI3519_FIXED_50M	66

#define HI3519_FIXED_75M	67

#define HI3519_FIXED_125M	68

#define HI3519_FIXED_150M	69

#define HI3519_FIXED_200M	70

#define HI3519_FIXED_250M	71

#define HI3519_FIXED_300M	72

#define HI3519_FIXED_400M	73

#define HI3519_FMC_MUX		74

#define HI3519_NR_CLKS		128

static const struct hisi_fixed_rate_clock hi3519_fixed_rate_clks[] = {

	{ HI3519_FIXED_24M, "24m", NULL, 0, 24000000, },

	{ HI3519_FIXED_50M, "50m", NULL, 0, 50000000, },

	{ HI3519_FIXED_75M, "75m", NULL, 0, 75000000, },

	{ HI3519_FIXED_125M, "125m", NULL, 0, 125000000, },

	{ HI3519_FIXED_150M, "150m", NULL, 0, 150000000, },

	{ HI3519_FIXED_200M, "200m", NULL, 0, 200000000, },

	{ HI3519_FIXED_250M, "250m", NULL, 0, 250000000, },

	{ HI3519_FIXED_300M, "300m", NULL, 0, 300000000, },

	{ HI3519_FIXED_400M, "400m", NULL, 0, 400000000, },

};

static const char *const fmc_mux_p[] = {

		"24m", "75m", "125m", "150m", "200m", "250m", "300m", "400m", };

static u32 fmc_mux_table[] = {0, 1, 2, 3, 4, 5, 6, 7};

static const struct hisi_mux_clock hi3519_mux_clks[] = {

	{ HI3519_FMC_MUX, "fmc_mux", fmc_mux_p, ARRAY_SIZE(fmc_mux_p),

		CLK_SET_RATE_PARENT, 0xc0, 2, 3, 0, fmc_mux_table, },

};

static const struct hisi_gate_clock hi3519_gate_clks[] = {

	{ HI3519_FMC_CLK, "clk_fmc", "fmc_mux",

		CLK_SET_RATE_PARENT, 0xc0, 1, 0, },

	{ HI3519_UART0_CLK, "clk_uart0", "24m",

		CLK_SET_RATE_PARENT, 0xe4, 20, 0, },

	{ HI3519_UART1_CLK, "clk_uart1", "24m",

		CLK_SET_RATE_PARENT, 0xe4, 21, 0, },

	{ HI3519_UART2_CLK, "clk_uart2", "24m",

		CLK_SET_RATE_PARENT, 0xe4, 22, 0, },

	{ HI3519_UART3_CLK, "clk_uart3", "24m",

		CLK_SET_RATE_PARENT, 0xe4, 23, 0, },

	{ HI3519_UART4_CLK, "clk_uart4", "24m",

		CLK_SET_RATE_PARENT, 0xe4, 24, 0, },

	{ HI3519_SPI0_CLK, "clk_spi0", "50m",

		CLK_SET_RATE_PARENT, 0xe4, 16, 0, },

	{ HI3519_SPI1_CLK, "clk_spi1", "50m",

		CLK_SET_RATE_PARENT, 0xe4, 17, 0, },

	{ HI3519_SPI2_CLK, "clk_spi2", "50m",

		CLK_SET_RATE_PARENT, 0xe4, 18, 0, },

};

static int hi3519_clk_probe(struct platform_device *pdev)

{

	struct device_node *np = pdev->dev.of_node;

	struct hisi_clock_data *clk_data;

	struct hisi_reset_controller *rstc;

	rstc = hisi_reset_init(np);

	if (!rstc)

		return -ENOMEM;

	clk_data = hisi_clk_init(np, HI3519_NR_CLKS);

	if (!clk_data) {

		hisi_reset_exit(rstc);

		return -ENODEV;

	}

	hisi_clk_register_fixed_rate(hi3519_fixed_rate_clks,

				     ARRAY_SIZE(hi3519_fixed_rate_clks),

				     clk_data);

	hisi_clk_register_mux(hi3519_mux_clks, ARRAY_SIZE(hi3519_mux_clks),

					clk_data);

	hisi_clk_register_gate(hi3519_gate_clks,

			ARRAY_SIZE(hi3519_gate_clks), clk_data);

	return 0;

}

static const struct of_device_id hi3519_clk_match_table[] = {

	{ .compatible = "hisilicon,hi3519-crg" },

	{ }

};

MODULE_DEVICE_TABLE(of, hi3519_clk_match_table);

static struct platform_driver hi3519_clk_driver = {

	.probe          = hi3519_clk_probe,

	.driver         = {

		.name   = "hi3519-clk",

		.of_match_table = hi3519_clk_match_table,

	},

};

static int __init hi3519_clk_init(void)

{

	return platform_driver_register(&hi3519_clk_driver);

}

core_initcall(hi3519_clk_init);

MODULE_LICENSE("GPL v2");

MODULE_DESCRIPTION("HiSilicon Hi3519 Clock Driver");

/*

 * Copyright (c) 2015 HiSilicon Technologies Co., Ltd.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program. If not, see <http://www.gnu.org/licenses/>.

 */

#ifndef __DTS_HI3519_CLOCK_H

#define __DTS_HI3519_CLOCK_H

#define HI3519_FMC_CLK			1

#define HI3519_SPI0_CLK			2

#define HI3519_SPI1_CLK			3

#define HI3519_SPI2_CLK			4

#define HI3519_UART0_CLK		5

#define HI3519_UART1_CLK		6

#define HI3519_UART2_CLK		7

#define HI3519_UART3_CLK		8

#define HI3519_UART4_CLK		9

#define HI3519_PWM_CLK			10

#define HI3519_DMA_CLK			11

#define HI3519_IR_CLK			12

#define HI3519_ETH_PHY_CLK		13

#define HI3519_ETH_MAC_CLK		14

#define HI3519_ETH_MACIF_CLK		15

#define HI3519_USB2_BUS_CLK		16

#define HI3519_USB2_PORT_CLK		17

#define HI3519_USB3_CLK			18

#endif	/* __DTS_HI3519_CLOCK_H */