[mirror_ubuntu-jammy-kernel.git] / drivers / clk / loongson1 / clk-loongson1c.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (c) 2016 Yang Ling <gnaygnil@gmail.com>
 */

#include <linux/clkdev.h>
#include <linux/clk-provider.h>
#include <linux/io.h>

#include <loongson1.h>
#include "clk.h"

#define OSC		(24 * 1000000)
#define DIV_APB		1

static DEFINE_SPINLOCK(_lock);

static unsigned long ls1x_pll_recalc_rate(struct clk_hw *hw,
					  unsigned long parent_rate)
{
	u32 pll, rate;

	pll = __raw_readl(LS1X_CLK_PLL_FREQ);
	rate = ((pll >> 8) & 0xff) + ((pll >> 16) & 0xff);
	rate *= OSC;
	rate >>= 2;

	return rate;
}

static const struct clk_ops ls1x_pll_clk_ops = {
	.recalc_rate = ls1x_pll_recalc_rate,
};

static const struct clk_div_table ahb_div_table[] = {
	[0] = { .val = 0, .div = 2 },
	[1] = { .val = 1, .div = 4 },
	[2] = { .val = 2, .div = 3 },
	[3] = { .val = 3, .div = 3 },
	[4] = { /* sentinel */ }
};

void __init ls1x_clk_init(void)
{
	struct clk_hw *hw;

	hw = clk_hw_register_fixed_rate(NULL, "osc_clk", NULL, 0, OSC);
	clk_hw_register_clkdev(hw, "osc_clk", NULL);

	/* clock derived from 24 MHz OSC clk */
	hw = clk_hw_register_pll(NULL, "pll_clk", "osc_clk",
				&ls1x_pll_clk_ops, 0);
	clk_hw_register_clkdev(hw, "pll_clk", NULL);

	hw = clk_hw_register_divider(NULL, "cpu_clk_div", "pll_clk",
				   CLK_GET_RATE_NOCACHE, LS1X_CLK_PLL_DIV,
				   DIV_CPU_SHIFT, DIV_CPU_WIDTH,
				   CLK_DIVIDER_ONE_BASED |
				   CLK_DIVIDER_ROUND_CLOSEST, &_lock);
	clk_hw_register_clkdev(hw, "cpu_clk_div", NULL);
	hw = clk_hw_register_fixed_factor(NULL, "cpu_clk", "cpu_clk_div",
					0, 1, 1);
	clk_hw_register_clkdev(hw, "cpu_clk", NULL);

	hw = clk_hw_register_divider(NULL, "dc_clk_div", "pll_clk",
				   0, LS1X_CLK_PLL_DIV, DIV_DC_SHIFT,
				   DIV_DC_WIDTH, CLK_DIVIDER_ONE_BASED, &_lock);
	clk_hw_register_clkdev(hw, "dc_clk_div", NULL);
	hw = clk_hw_register_fixed_factor(NULL, "dc_clk", "dc_clk_div",
					0, 1, 1);
	clk_hw_register_clkdev(hw, "dc_clk", NULL);

	hw = clk_hw_register_divider_table(NULL, "ahb_clk_div", "cpu_clk_div",
				0, LS1X_CLK_PLL_FREQ, DIV_DDR_SHIFT,
				DIV_DDR_WIDTH, CLK_DIVIDER_ALLOW_ZERO,
				ahb_div_table, &_lock);
	clk_hw_register_clkdev(hw, "ahb_clk_div", NULL);
	hw = clk_hw_register_fixed_factor(NULL, "ahb_clk", "ahb_clk_div",
					0, 1, 1);
	clk_hw_register_clkdev(hw, "ahb_clk", NULL);
	clk_hw_register_clkdev(hw, "ls1x-dma", NULL);
	clk_hw_register_clkdev(hw, "stmmaceth", NULL);

	/* clock derived from AHB clk */
	hw = clk_hw_register_fixed_factor(NULL, "apb_clk", "ahb_clk", 0, 1,
					DIV_APB);
	clk_hw_register_clkdev(hw, "apb_clk", NULL);
	clk_hw_register_clkdev(hw, "ls1x-ac97", NULL);
	clk_hw_register_clkdev(hw, "ls1x-i2c", NULL);
	clk_hw_register_clkdev(hw, "ls1x-nand", NULL);
	clk_hw_register_clkdev(hw, "ls1x-pwmtimer", NULL);
	clk_hw_register_clkdev(hw, "ls1x-spi", NULL);
	clk_hw_register_clkdev(hw, "ls1x-wdt", NULL);
	clk_hw_register_clkdev(hw, "serial8250", NULL);
}
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
b4626a7f YL	2	/*
b4626a7f YL	3	* Copyright (c) 2016 Yang Ling <gnaygnil@gmail.com>
b4626a7f YL	4	*/
	5
	6	#include <linux/clkdev.h>
	7	#include <linux/clk-provider.h>
62e59c4e	8	#include <linux/io.h>
b4626a7f YL	9
	10	#include <loongson1.h>
	11	#include "clk.h"
	12
	13	#define OSC (24 * 1000000)
	14	#define DIV_APB 1
	15
	16	static DEFINE_SPINLOCK(_lock);
	17
	18	static unsigned long ls1x_pll_recalc_rate(struct clk_hw *hw,
	19	unsigned long parent_rate)
	20	{
	21	u32 pll, rate;
	22
	23	pll = __raw_readl(LS1X_CLK_PLL_FREQ);
	24	rate = ((pll >> 8) & 0xff) + ((pll >> 16) & 0xff);
	25	rate *= OSC;
	26	rate >>= 2;
	27
	28	return rate;
	29	}
	30
	31	static const struct clk_ops ls1x_pll_clk_ops = {
	32	.recalc_rate = ls1x_pll_recalc_rate,
	33	};
	34
	35	static const struct clk_div_table ahb_div_table[] = {
	36	[0] = { .val = 0, .div = 2 },
	37	[1] = { .val = 1, .div = 4 },
	38	[2] = { .val = 2, .div = 3 },
	39	[3] = { .val = 3, .div = 3 },
e0eeb52c	40	[4] = { /* sentinel */ }
b4626a7f YL	41	};
	42
	43	void __init ls1x_clk_init(void)
	44	{
	45	struct clk_hw *hw;
	46
	47	hw = clk_hw_register_fixed_rate(NULL, "osc_clk", NULL, 0, OSC);
	48	clk_hw_register_clkdev(hw, "osc_clk", NULL);
	49
	50	/* clock derived from 24 MHz OSC clk */
	51	hw = clk_hw_register_pll(NULL, "pll_clk", "osc_clk",
	52	&ls1x_pll_clk_ops, 0);
	53	clk_hw_register_clkdev(hw, "pll_clk", NULL);
	54
	55	hw = clk_hw_register_divider(NULL, "cpu_clk_div", "pll_clk",
	56	CLK_GET_RATE_NOCACHE, LS1X_CLK_PLL_DIV,
	57	DIV_CPU_SHIFT, DIV_CPU_WIDTH,
	58	CLK_DIVIDER_ONE_BASED \|
	59	CLK_DIVIDER_ROUND_CLOSEST, &_lock);
	60	clk_hw_register_clkdev(hw, "cpu_clk_div", NULL);
	61	hw = clk_hw_register_fixed_factor(NULL, "cpu_clk", "cpu_clk_div",
	62	0, 1, 1);
	63	clk_hw_register_clkdev(hw, "cpu_clk", NULL);
	64
	65	hw = clk_hw_register_divider(NULL, "dc_clk_div", "pll_clk",
	66	0, LS1X_CLK_PLL_DIV, DIV_DC_SHIFT,
	67	DIV_DC_WIDTH, CLK_DIVIDER_ONE_BASED, &_lock);
	68	clk_hw_register_clkdev(hw, "dc_clk_div", NULL);
	69	hw = clk_hw_register_fixed_factor(NULL, "dc_clk", "dc_clk_div",
	70	0, 1, 1);
	71	clk_hw_register_clkdev(hw, "dc_clk", NULL);
	72
	73	hw = clk_hw_register_divider_table(NULL, "ahb_clk_div", "cpu_clk_div",
	74	0, LS1X_CLK_PLL_FREQ, DIV_DDR_SHIFT,
	75	DIV_DDR_WIDTH, CLK_DIVIDER_ALLOW_ZERO,
	76	ahb_div_table, &_lock);
	77	clk_hw_register_clkdev(hw, "ahb_clk_div", NULL);
	78	hw = clk_hw_register_fixed_factor(NULL, "ahb_clk", "ahb_clk_div",
	79	0, 1, 1);
	80	clk_hw_register_clkdev(hw, "ahb_clk", NULL);
	81	clk_hw_register_clkdev(hw, "ls1x-dma", NULL);
	82	clk_hw_register_clkdev(hw, "stmmaceth", NULL);
	83
	84	/* clock derived from AHB clk */
	85	hw = clk_hw_register_fixed_factor(NULL, "apb_clk", "ahb_clk", 0, 1,
	86	DIV_APB);
	87	clk_hw_register_clkdev(hw, "apb_clk", NULL);
	88	clk_hw_register_clkdev(hw, "ls1x-ac97", NULL);
	89	clk_hw_register_clkdev(hw, "ls1x-i2c", NULL);
	90	clk_hw_register_clkdev(hw, "ls1x-nand", NULL);
	91	clk_hw_register_clkdev(hw, "ls1x-pwmtimer", NULL);
	92	clk_hw_register_clkdev(hw, "ls1x-spi", NULL);
	93	clk_hw_register_clkdev(hw, "ls1x-wdt", NULL);
	94	clk_hw_register_clkdev(hw, "serial8250", NULL);
	95	}