drivers/clk/hisilicon/clk-hi3519.c

/*
 * 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");