[linux-block.git] / drivers / clk / versatile / clk-impd1.c

/*
 * Clock driver for the ARM Integrator/IM-PD1 board
 * Copyright (C) 2012-2013 Linus Walleij
 *
 * 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.
 */
#include <linux/clk-provider.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/platform_data/clk-integrator.h>

#include "clk-icst.h"

#define IMPD1_OSC1	0x00
#define IMPD1_OSC2	0x04
#define IMPD1_LOCK	0x08

struct impd1_clk {
	char *vco1name;
	struct clk *vco1clk;
	char *vco2name;
	struct clk *vco2clk;
	struct clk *mmciclk;
	char *uartname;
	struct clk *uartclk;
	char *spiname;
	struct clk *spiclk;
	char *scname;
	struct clk *scclk;
	struct clk_lookup *clks[6];
};

/* One entry for each connected IM-PD1 LM */
static struct impd1_clk impd1_clks[4];

/*
 * There are two VCO's on the IM-PD1
 */

static const struct icst_params impd1_vco1_params = {
	.ref		= 24000000,	/* 24 MHz */
	.vco_max	= ICST525_VCO_MAX_3V,
	.vco_min	= ICST525_VCO_MIN,
	.vd_min		= 12,
	.vd_max		= 519,
	.rd_min		= 3,
	.rd_max		= 120,
	.s2div		= icst525_s2div,
	.idx2s		= icst525_idx2s,
};

static const struct clk_icst_desc impd1_icst1_desc = {
	.params = &impd1_vco1_params,
	.vco_offset = IMPD1_OSC1,
	.lock_offset = IMPD1_LOCK,
};

static const struct icst_params impd1_vco2_params = {
	.ref		= 24000000,	/* 24 MHz */
	.vco_max	= ICST525_VCO_MAX_3V,
	.vco_min	= ICST525_VCO_MIN,
	.vd_min		= 12,
	.vd_max		= 519,
	.rd_min		= 3,
	.rd_max		= 120,
	.s2div		= icst525_s2div,
	.idx2s		= icst525_idx2s,
};

static const struct clk_icst_desc impd1_icst2_desc = {
	.params = &impd1_vco2_params,
	.vco_offset = IMPD1_OSC2,
	.lock_offset = IMPD1_LOCK,
};

/**
 * integrator_impd1_clk_init() - set up the integrator clock tree
 * @base: base address of the logic module (LM)
 * @id: the ID of this LM
 */
void integrator_impd1_clk_init(void __iomem *base, unsigned int id)
{
	struct impd1_clk *imc;
	struct clk *clk;
	int i;

	if (id > 3) {
		pr_crit("no more than 4 LMs can be attached\n");
		return;
	}
	imc = &impd1_clks[id];

	imc->vco1name = kasprintf(GFP_KERNEL, "lm%x-vco1", id);
	clk = icst_clk_register(NULL, &impd1_icst1_desc, imc->vco1name, NULL,
				base);
	imc->vco1clk = clk;
	imc->clks[0] = clkdev_alloc(clk, NULL, "lm%x:01000", id);

	/* VCO2 is also called "CLK2" */
	imc->vco2name = kasprintf(GFP_KERNEL, "lm%x-vco2", id);
	clk = icst_clk_register(NULL, &impd1_icst2_desc, imc->vco2name, NULL,
				base);
	imc->vco2clk = clk;

	/* MMCI uses CLK2 right off */
	imc->clks[1] = clkdev_alloc(clk, NULL, "lm%x:00700", id);

	/* UART reference clock divides CLK2 by a fixed factor 4 */
	imc->uartname = kasprintf(GFP_KERNEL, "lm%x-uartclk", id);
	clk = clk_register_fixed_factor(NULL, imc->uartname, imc->vco2name,
				   CLK_IGNORE_UNUSED, 1, 4);
	imc->uartclk = clk;
	imc->clks[2] = clkdev_alloc(clk, NULL, "lm%x:00100", id);
	imc->clks[3] = clkdev_alloc(clk, NULL, "lm%x:00200", id);

	/* SPI PL022 clock divides CLK2 by a fixed factor 64 */
	imc->spiname = kasprintf(GFP_KERNEL, "lm%x-spiclk", id);
	clk = clk_register_fixed_factor(NULL, imc->spiname, imc->vco2name,
				   CLK_IGNORE_UNUSED, 1, 64);
	imc->clks[4] = clkdev_alloc(clk, NULL, "lm%x:00300", id);

	/* Smart Card clock divides CLK2 by a fixed factor 4 */
	imc->scname = kasprintf(GFP_KERNEL, "lm%x-scclk", id);
	clk = clk_register_fixed_factor(NULL, imc->scname, imc->vco2name,
				   CLK_IGNORE_UNUSED, 1, 4);
	imc->scclk = clk;
	imc->clks[5] = clkdev_alloc(clk, NULL, "lm%x:00600", id);

	for (i = 0; i < ARRAY_SIZE(imc->clks); i++)
		clkdev_add(imc->clks[i]);
}

void integrator_impd1_clk_exit(unsigned int id)
{
	int i;
	struct impd1_clk *imc;

	if (id > 3)
		return;
	imc = &impd1_clks[id];

	for (i = 0; i < ARRAY_SIZE(imc->clks); i++)
		clkdev_drop(imc->clks[i]);
	clk_unregister(imc->spiclk);
	clk_unregister(imc->uartclk);
	clk_unregister(imc->vco2clk);
	clk_unregister(imc->vco1clk);
	kfree(imc->scname);
	kfree(imc->spiname);
	kfree(imc->uartname);
	kfree(imc->vco2name);
	kfree(imc->vco1name);
}
Commit	Line	Data
70ee6577 LW	1	/*
70ee6577 LW	2	* Clock driver for the ARM Integrator/IM-PD1 board
8e048b99	3	* Copyright (C) 2012-2013 Linus Walleij
70ee6577 LW	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	#include <linux/clk-provider.h>
	10	#include <linux/clk.h>
	11	#include <linux/clkdev.h>
	12	#include <linux/err.h>
	13	#include <linux/io.h>
	14	#include <linux/platform_data/clk-integrator.h>
	15
70ee6577 LW	16	#include "clk-icst.h"
70ee6577 LW	17
cc0cc4ca LW	18	#define IMPD1_OSC1 0x00
	19	#define IMPD1_OSC2 0x04
	20	#define IMPD1_LOCK 0x08
	21
70ee6577	22	struct impd1_clk {
8e048b99 LW	23	char *vco1name;
	24	struct clk *vco1clk;
	25	char *vco2name;
	26	struct clk *vco2clk;
	27	struct clk *mmciclk;
	28	char *uartname;
70ee6577	29	struct clk *uartclk;
8e048b99 LW	30	char *spiname;
	31	struct clk *spiclk;
	32	char *scname;
	33	struct clk *scclk;
	34	struct clk_lookup *clks[6];
70ee6577 LW	35	};
70ee6577 LW	36
8e048b99	37	/* One entry for each connected IM-PD1 LM */
70ee6577 LW	38	static struct impd1_clk impd1_clks[4];
	39
	40	/*
8e048b99	41	* There are two VCO's on the IM-PD1
70ee6577 LW	42	*/
70ee6577 LW	43
8e048b99	44	static const struct icst_params impd1_vco1_params = {
70ee6577 LW	45	.ref = 24000000, /* 24 MHz */
	46	.vco_max = ICST525_VCO_MAX_3V,
	47	.vco_min = ICST525_VCO_MIN,
	48	.vd_min = 12,
	49	.vd_max = 519,
	50	.rd_min = 3,
	51	.rd_max = 120,
	52	.s2div = icst525_s2div,
	53	.idx2s = icst525_idx2s,
	54	};
	55
	56	static const struct clk_icst_desc impd1_icst1_desc = {
8e048b99	57	.params = &impd1_vco1_params,
70ee6577 LW	58	.vco_offset = IMPD1_OSC1,
	59	.lock_offset = IMPD1_LOCK,
	60	};
	61
8e048b99 LW	62	static const struct icst_params impd1_vco2_params = {
	63	.ref = 24000000, /* 24 MHz */
	64	.vco_max = ICST525_VCO_MAX_3V,
	65	.vco_min = ICST525_VCO_MIN,
	66	.vd_min = 12,
	67	.vd_max = 519,
	68	.rd_min = 3,
	69	.rd_max = 120,
	70	.s2div = icst525_s2div,
	71	.idx2s = icst525_idx2s,
	72	};
	73
	74	static const struct clk_icst_desc impd1_icst2_desc = {
	75	.params = &impd1_vco2_params,
	76	.vco_offset = IMPD1_OSC2,
	77	.lock_offset = IMPD1_LOCK,
	78	};
	79
70ee6577 LW	80	/**
	81	* integrator_impd1_clk_init() - set up the integrator clock tree
	82	* @base: base address of the logic module (LM)
	83	* @id: the ID of this LM
	84	*/
	85	void integrator_impd1_clk_init(void __iomem *base, unsigned int id)
	86	{
	87	struct impd1_clk *imc;
	88	struct clk *clk;
	89	int i;
	90
	91	if (id > 3) {
	92	pr_crit("no more than 4 LMs can be attached\n");
	93	return;
	94	}
	95	imc = &impd1_clks[id];
	96
8e048b99	97	imc->vco1name = kasprintf(GFP_KERNEL, "lm%x-vco1", id);
bf6edb4b LW	98	clk = icst_clk_register(NULL, &impd1_icst1_desc, imc->vco1name, NULL,
bf6edb4b LW	99	base);
ae6e694e	100	imc->vco1clk = clk;
70ee6577 LW	101	imc->clks[0] = clkdev_alloc(clk, NULL, "lm%x:01000", id);
70ee6577 LW	102
8e048b99 LW	103	/* VCO2 is also called "CLK2" */
8e048b99 LW	104	imc->vco2name = kasprintf(GFP_KERNEL, "lm%x-vco2", id);
bf6edb4b LW	105	clk = icst_clk_register(NULL, &impd1_icst2_desc, imc->vco2name, NULL,
bf6edb4b LW	106	base);
8e048b99 LW	107	imc->vco2clk = clk;
	108
	109	/* MMCI uses CLK2 right off */
	110	imc->clks[1] = clkdev_alloc(clk, NULL, "lm%x:00700", id);
	111
	112	/* UART reference clock divides CLK2 by a fixed factor 4 */
	113	imc->uartname = kasprintf(GFP_KERNEL, "lm%x-uartclk", id);
	114	clk = clk_register_fixed_factor(NULL, imc->uartname, imc->vco2name,
	115	CLK_IGNORE_UNUSED, 1, 4);
70ee6577	116	imc->uartclk = clk;
8e048b99 LW	117	imc->clks[2] = clkdev_alloc(clk, NULL, "lm%x:00100", id);
	118	imc->clks[3] = clkdev_alloc(clk, NULL, "lm%x:00200", id);
	119
	120	/* SPI PL022 clock divides CLK2 by a fixed factor 64 */
	121	imc->spiname = kasprintf(GFP_KERNEL, "lm%x-spiclk", id);
	122	clk = clk_register_fixed_factor(NULL, imc->spiname, imc->vco2name,
	123	CLK_IGNORE_UNUSED, 1, 64);
	124	imc->clks[4] = clkdev_alloc(clk, NULL, "lm%x:00300", id);
	125
	126	/* Smart Card clock divides CLK2 by a fixed factor 4 */
	127	imc->scname = kasprintf(GFP_KERNEL, "lm%x-scclk", id);
	128	clk = clk_register_fixed_factor(NULL, imc->scname, imc->vco2name,
	129	CLK_IGNORE_UNUSED, 1, 4);
	130	imc->scclk = clk;
	131	imc->clks[5] = clkdev_alloc(clk, NULL, "lm%x:00600", id);
70ee6577 LW	132
	133	for (i = 0; i < ARRAY_SIZE(imc->clks); i++)
	134	clkdev_add(imc->clks[i]);
	135	}
	136
	137	void integrator_impd1_clk_exit(unsigned int id)
	138	{
	139	int i;
	140	struct impd1_clk *imc;
	141
	142	if (id > 3)
	143	return;
	144	imc = &impd1_clks[id];
	145
	146	for (i = 0; i < ARRAY_SIZE(imc->clks); i++)
	147	clkdev_drop(imc->clks[i]);
8e048b99	148	clk_unregister(imc->spiclk);
70ee6577	149	clk_unregister(imc->uartclk);
8e048b99 LW	150	clk_unregister(imc->vco2clk);
	151	clk_unregister(imc->vco1clk);
	152	kfree(imc->scname);
	153	kfree(imc->spiname);
	154	kfree(imc->uartname);
	155	kfree(imc->vco2name);
	156	kfree(imc->vco1name);
70ee6577	157	}