[deliverable/linux.git] / drivers / clk / qcom / clk-rcg2.c

/*
 * Copyright (c) 2013, The Linux Foundation. All rights reserved.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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.
 */

#include <linux/kernel.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/bug.h>
#include <linux/export.h>
#include <linux/clk-provider.h>
#include <linux/delay.h>
#include <linux/regmap.h>
#include <linux/math64.h>

#include <asm/div64.h>

#include "clk-rcg.h"
#include "common.h"

#define CMD_REG			0x0
#define CMD_UPDATE		BIT(0)
#define CMD_ROOT_EN		BIT(1)
#define CMD_DIRTY_CFG		BIT(4)
#define CMD_DIRTY_N		BIT(5)
#define CMD_DIRTY_M		BIT(6)
#define CMD_DIRTY_D		BIT(7)
#define CMD_ROOT_OFF		BIT(31)

#define CFG_REG			0x4
#define CFG_SRC_DIV_SHIFT	0
#define CFG_SRC_SEL_SHIFT	8
#define CFG_SRC_SEL_MASK	(0x7 << CFG_SRC_SEL_SHIFT)
#define CFG_MODE_SHIFT		12
#define CFG_MODE_MASK		(0x3 << CFG_MODE_SHIFT)
#define CFG_MODE_DUAL_EDGE	(0x2 << CFG_MODE_SHIFT)

#define M_REG			0x8
#define N_REG			0xc
#define D_REG			0x10

static int clk_rcg2_is_enabled(struct clk_hw *hw)
{
	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
	u32 cmd;
	int ret;

	ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG, &cmd);
	if (ret)
		return ret;

	return (cmd & CMD_ROOT_OFF) == 0;
}

static u8 clk_rcg2_get_parent(struct clk_hw *hw)
{
	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
	int num_parents = __clk_get_num_parents(hw->clk);
	u32 cfg;
	int i, ret;

	ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg);
	if (ret)
		goto err;

	cfg &= CFG_SRC_SEL_MASK;
	cfg >>= CFG_SRC_SEL_SHIFT;

	for (i = 0; i < num_parents; i++)
		if (cfg == rcg->parent_map[i].cfg)
			return i;

err:
	pr_debug("%s: Clock %s has invalid parent, using default.\n",
		 __func__, __clk_get_name(hw->clk));
	return 0;
}

static int update_config(struct clk_rcg2 *rcg)
{
	int count, ret;
	u32 cmd;
	struct clk_hw *hw = &rcg->clkr.hw;
	const char *name = __clk_get_name(hw->clk);

	ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG,
				 CMD_UPDATE, CMD_UPDATE);
	if (ret)
		return ret;

	/* Wait for update to take effect */
	for (count = 500; count > 0; count--) {
		ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG, &cmd);
		if (ret)
			return ret;
		if (!(cmd & CMD_UPDATE))
			return 0;
		udelay(1);
	}

	WARN(1, "%s: rcg didn't update its configuration.", name);
	return 0;
}

static int clk_rcg2_set_parent(struct clk_hw *hw, u8 index)
{
	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
	int ret;
	u32 cfg = rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT;

	ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
				 CFG_SRC_SEL_MASK, cfg);
	if (ret)
		return ret;

	return update_config(rcg);
}

/*
 * Calculate m/n:d rate
 *
 *          parent_rate     m
 *   rate = ----------- x  ---
 *            hid_div       n
 */
static unsigned long
calc_rate(unsigned long rate, u32 m, u32 n, u32 mode, u32 hid_div)
{
	if (hid_div) {
		rate *= 2;
		rate /= hid_div + 1;
	}

	if (mode) {
		u64 tmp = rate;
		tmp *= m;
		do_div(tmp, n);
		rate = tmp;
	}

	return rate;
}

static unsigned long
clk_rcg2_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
{
	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
	u32 cfg, hid_div, m = 0, n = 0, mode = 0, mask;

	regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg);

	if (rcg->mnd_width) {
		mask = BIT(rcg->mnd_width) - 1;
		regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + M_REG, &m);
		m &= mask;
		regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + N_REG, &n);
		n =  ~n;
		n &= mask;
		n += m;
		mode = cfg & CFG_MODE_MASK;
		mode >>= CFG_MODE_SHIFT;
	}

	mask = BIT(rcg->hid_width) - 1;
	hid_div = cfg >> CFG_SRC_DIV_SHIFT;
	hid_div &= mask;

	return calc_rate(parent_rate, m, n, mode, hid_div);
}

static long _freq_tbl_determine_rate(struct clk_hw *hw,
		const struct freq_tbl *f, unsigned long rate,
		unsigned long *p_rate, struct clk_hw **p_hw)
{
	unsigned long clk_flags;
	struct clk *p;

	f = qcom_find_freq(f, rate);
	if (!f)
		return -EINVAL;

	clk_flags = __clk_get_flags(hw->clk);
	p = clk_get_parent_by_index(hw->clk, f->src);
	if (clk_flags & CLK_SET_RATE_PARENT) {
		if (f->pre_div) {
			rate /= 2;
			rate *= f->pre_div + 1;
		}

		if (f->n) {
			u64 tmp = rate;
			tmp = tmp * f->n;
			do_div(tmp, f->m);
			rate = tmp;
		}
	} else {
		rate =  __clk_get_rate(p);
	}
	*p_hw = __clk_get_hw(p);
	*p_rate = rate;

	return f->freq;
}

static long clk_rcg2_determine_rate(struct clk_hw *hw, unsigned long rate,
		unsigned long min_rate, unsigned long max_rate,
		unsigned long *p_rate, struct clk_hw **p)
{
	struct clk_rcg2 *rcg = to_clk_rcg2(hw);

	return _freq_tbl_determine_rate(hw, rcg->freq_tbl, rate, p_rate, p);
}

static int clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f)
{
	u32 cfg, mask;
	struct clk_hw *hw = &rcg->clkr.hw;
	int ret, index = qcom_find_src_index(hw, rcg->parent_map, f->src);

	if (index < 0)
		return index;

	if (rcg->mnd_width && f->n) {
		mask = BIT(rcg->mnd_width) - 1;
		ret = regmap_update_bits(rcg->clkr.regmap,
				rcg->cmd_rcgr + M_REG, mask, f->m);
		if (ret)
			return ret;

		ret = regmap_update_bits(rcg->clkr.regmap,
				rcg->cmd_rcgr + N_REG, mask, ~(f->n - f->m));
		if (ret)
			return ret;

		ret = regmap_update_bits(rcg->clkr.regmap,
				rcg->cmd_rcgr + D_REG, mask, ~f->n);
		if (ret)
			return ret;
	}

	mask = BIT(rcg->hid_width) - 1;
	mask |= CFG_SRC_SEL_MASK | CFG_MODE_MASK;
	cfg = f->pre_div << CFG_SRC_DIV_SHIFT;
	cfg |= rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT;
	if (rcg->mnd_width && f->n && (f->m != f->n))
		cfg |= CFG_MODE_DUAL_EDGE;
	ret = regmap_update_bits(rcg->clkr.regmap,
			rcg->cmd_rcgr + CFG_REG, mask, cfg);
	if (ret)
		return ret;

	return update_config(rcg);
}

static int __clk_rcg2_set_rate(struct clk_hw *hw, unsigned long rate)
{
	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
	const struct freq_tbl *f;

	f = qcom_find_freq(rcg->freq_tbl, rate);
	if (!f)
		return -EINVAL;

	return clk_rcg2_configure(rcg, f);
}

static int clk_rcg2_set_rate(struct clk_hw *hw, unsigned long rate,
			    unsigned long parent_rate)
{
	return __clk_rcg2_set_rate(hw, rate);
}

static int clk_rcg2_set_rate_and_parent(struct clk_hw *hw,
		unsigned long rate, unsigned long parent_rate, u8 index)
{
	return __clk_rcg2_set_rate(hw, rate);
}

const struct clk_ops clk_rcg2_ops = {
	.is_enabled = clk_rcg2_is_enabled,
	.get_parent = clk_rcg2_get_parent,
	.set_parent = clk_rcg2_set_parent,
	.recalc_rate = clk_rcg2_recalc_rate,
	.determine_rate = clk_rcg2_determine_rate,
	.set_rate = clk_rcg2_set_rate,
	.set_rate_and_parent = clk_rcg2_set_rate_and_parent,
};
EXPORT_SYMBOL_GPL(clk_rcg2_ops);

struct frac_entry {
	int num;
	int den;
};

static const struct frac_entry frac_table_675m[] = {	/* link rate of 270M */
	{ 52, 295 },	/* 119 M */
	{ 11, 57 },	/* 130.25 M */
	{ 63, 307 },	/* 138.50 M */
	{ 11, 50 },	/* 148.50 M */
	{ 47, 206 },	/* 154 M */
	{ 31, 100 },	/* 205.25 M */
	{ 107, 269 },	/* 268.50 M */
	{ },
};

static struct frac_entry frac_table_810m[] = { /* Link rate of 162M */
	{ 31, 211 },	/* 119 M */
	{ 32, 199 },	/* 130.25 M */
	{ 63, 307 },	/* 138.50 M */
	{ 11, 60 },	/* 148.50 M */
	{ 50, 263 },	/* 154 M */
	{ 31, 120 },	/* 205.25 M */
	{ 119, 359 },	/* 268.50 M */
	{ },
};

static int clk_edp_pixel_set_rate(struct clk_hw *hw, unsigned long rate,
			      unsigned long parent_rate)
{
	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
	struct freq_tbl f = *rcg->freq_tbl;
	const struct frac_entry *frac;
	int delta = 100000;
	s64 src_rate = parent_rate;
	s64 request;
	u32 mask = BIT(rcg->hid_width) - 1;
	u32 hid_div;

	if (src_rate == 810000000)
		frac = frac_table_810m;
	else
		frac = frac_table_675m;

	for (; frac->num; frac++) {
		request = rate;
		request *= frac->den;
		request = div_s64(request, frac->num);
		if ((src_rate < (request - delta)) ||
		    (src_rate > (request + delta)))
			continue;

		regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
				&hid_div);
		f.pre_div = hid_div;
		f.pre_div >>= CFG_SRC_DIV_SHIFT;
		f.pre_div &= mask;
		f.m = frac->num;
		f.n = frac->den;

		return clk_rcg2_configure(rcg, &f);
	}

	return -EINVAL;
}

static int clk_edp_pixel_set_rate_and_parent(struct clk_hw *hw,
		unsigned long rate, unsigned long parent_rate, u8 index)
{
	/* Parent index is set statically in frequency table */
	return clk_edp_pixel_set_rate(hw, rate, parent_rate);
}

static long clk_edp_pixel_determine_rate(struct clk_hw *hw, unsigned long rate,
				 unsigned long min_rate,
				 unsigned long max_rate,
				 unsigned long *p_rate, struct clk_hw **p)
{
	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
	const struct freq_tbl *f = rcg->freq_tbl;
	const struct frac_entry *frac;
	int delta = 100000;
	s64 src_rate = *p_rate;
	s64 request;
	u32 mask = BIT(rcg->hid_width) - 1;
	u32 hid_div;

	/* Force the correct parent */
	*p = __clk_get_hw(clk_get_parent_by_index(hw->clk, f->src));

	if (src_rate == 810000000)
		frac = frac_table_810m;
	else
		frac = frac_table_675m;

	for (; frac->num; frac++) {
		request = rate;
		request *= frac->den;
		request = div_s64(request, frac->num);
		if ((src_rate < (request - delta)) ||
		    (src_rate > (request + delta)))
			continue;

		regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
				&hid_div);
		hid_div >>= CFG_SRC_DIV_SHIFT;
		hid_div &= mask;

		return calc_rate(src_rate, frac->num, frac->den, !!frac->den,
				 hid_div);
	}

	return -EINVAL;
}

const struct clk_ops clk_edp_pixel_ops = {
	.is_enabled = clk_rcg2_is_enabled,
	.get_parent = clk_rcg2_get_parent,
	.set_parent = clk_rcg2_set_parent,
	.recalc_rate = clk_rcg2_recalc_rate,
	.set_rate = clk_edp_pixel_set_rate,
	.set_rate_and_parent = clk_edp_pixel_set_rate_and_parent,
	.determine_rate = clk_edp_pixel_determine_rate,
};
EXPORT_SYMBOL_GPL(clk_edp_pixel_ops);

static long clk_byte_determine_rate(struct clk_hw *hw, unsigned long rate,
			 unsigned long min_rate, unsigned long max_rate,
			 unsigned long *p_rate, struct clk_hw **p_hw)
{
	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
	const struct freq_tbl *f = rcg->freq_tbl;
	unsigned long parent_rate, div;
	u32 mask = BIT(rcg->hid_width) - 1;
	struct clk *p;

	if (rate == 0)
		return -EINVAL;

	p = clk_get_parent_by_index(hw->clk, f->src);
	*p_hw = __clk_get_hw(p);
	*p_rate = parent_rate = __clk_round_rate(p, rate);

	div = DIV_ROUND_UP((2 * parent_rate), rate) - 1;
	div = min_t(u32, div, mask);

	return calc_rate(parent_rate, 0, 0, 0, div);
}

static int clk_byte_set_rate(struct clk_hw *hw, unsigned long rate,
			 unsigned long parent_rate)
{
	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
	struct freq_tbl f = *rcg->freq_tbl;
	unsigned long div;
	u32 mask = BIT(rcg->hid_width) - 1;

	div = DIV_ROUND_UP((2 * parent_rate), rate) - 1;
	div = min_t(u32, div, mask);

	f.pre_div = div;

	return clk_rcg2_configure(rcg, &f);
}

static int clk_byte_set_rate_and_parent(struct clk_hw *hw,
		unsigned long rate, unsigned long parent_rate, u8 index)
{
	/* Parent index is set statically in frequency table */
	return clk_byte_set_rate(hw, rate, parent_rate);
}

const struct clk_ops clk_byte_ops = {
	.is_enabled = clk_rcg2_is_enabled,
	.get_parent = clk_rcg2_get_parent,
	.set_parent = clk_rcg2_set_parent,
	.recalc_rate = clk_rcg2_recalc_rate,
	.set_rate = clk_byte_set_rate,
	.set_rate_and_parent = clk_byte_set_rate_and_parent,
	.determine_rate = clk_byte_determine_rate,
};
EXPORT_SYMBOL_GPL(clk_byte_ops);

static const struct frac_entry frac_table_pixel[] = {
	{ 3, 8 },
	{ 2, 9 },
	{ 4, 9 },
	{ 1, 1 },
	{ }
};

static long clk_pixel_determine_rate(struct clk_hw *hw, unsigned long rate,
				 unsigned long min_rate,
				 unsigned long max_rate,
				 unsigned long *p_rate, struct clk_hw **p)
{
	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
	unsigned long request, src_rate;
	int delta = 100000;
	const struct freq_tbl *f = rcg->freq_tbl;
	const struct frac_entry *frac = frac_table_pixel;
	struct clk *parent = clk_get_parent_by_index(hw->clk, f->src);

	*p = __clk_get_hw(parent);

	for (; frac->num; frac++) {
		request = (rate * frac->den) / frac->num;

		src_rate = __clk_round_rate(parent, request);
		if ((src_rate < (request - delta)) ||
			(src_rate > (request + delta)))
			continue;

		*p_rate = src_rate;
		return (src_rate * frac->num) / frac->den;
	}

	return -EINVAL;
}

static int clk_pixel_set_rate(struct clk_hw *hw, unsigned long rate,
		unsigned long parent_rate)
{
	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
	struct freq_tbl f = *rcg->freq_tbl;
	const struct frac_entry *frac = frac_table_pixel;
	unsigned long request, src_rate;
	int delta = 100000;
	u32 mask = BIT(rcg->hid_width) - 1;
	u32 hid_div;
	struct clk *parent = clk_get_parent_by_index(hw->clk, f.src);

	for (; frac->num; frac++) {
		request = (rate * frac->den) / frac->num;

		src_rate = __clk_round_rate(parent, request);
		if ((src_rate < (request - delta)) ||
			(src_rate > (request + delta)))
			continue;

		regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
				&hid_div);
		f.pre_div = hid_div;
		f.pre_div >>= CFG_SRC_DIV_SHIFT;
		f.pre_div &= mask;
		f.m = frac->num;
		f.n = frac->den;

		return clk_rcg2_configure(rcg, &f);
	}
	return -EINVAL;
}

static int clk_pixel_set_rate_and_parent(struct clk_hw *hw, unsigned long rate,
		unsigned long parent_rate, u8 index)
{
	/* Parent index is set statically in frequency table */
	return clk_pixel_set_rate(hw, rate, parent_rate);
}

const struct clk_ops clk_pixel_ops = {
	.is_enabled = clk_rcg2_is_enabled,
	.get_parent = clk_rcg2_get_parent,
	.set_parent = clk_rcg2_set_parent,
	.recalc_rate = clk_rcg2_recalc_rate,
	.set_rate = clk_pixel_set_rate,
	.set_rate_and_parent = clk_pixel_set_rate_and_parent,
	.determine_rate = clk_pixel_determine_rate,
};
EXPORT_SYMBOL_GPL(clk_pixel_ops);
Commit	Line	Data
bcd61c0f SB	1	/*
	2	* Copyright (c) 2013, The Linux Foundation. All rights reserved.
	3	*
	4	* This software is licensed under the terms of the GNU General Public
	5	* License version 2, as published by the Free Software Foundation, and
	6	* may be copied, distributed, and modified under those terms.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*/
	13
	14	#include <linux/kernel.h>
	15	#include <linux/bitops.h>
	16	#include <linux/err.h>
	17	#include <linux/bug.h>
	18	#include <linux/export.h>
	19	#include <linux/clk-provider.h>
	20	#include <linux/delay.h>
	21	#include <linux/regmap.h>
99cbd064	22	#include <linux/math64.h>
bcd61c0f SB	23
	24	#include <asm/div64.h>
	25
	26	#include "clk-rcg.h"
50c6a503	27	#include "common.h"
bcd61c0f SB	28
	29	#define CMD_REG 0x0
	30	#define CMD_UPDATE BIT(0)
	31	#define CMD_ROOT_EN BIT(1)
	32	#define CMD_DIRTY_CFG BIT(4)
	33	#define CMD_DIRTY_N BIT(5)
	34	#define CMD_DIRTY_M BIT(6)
	35	#define CMD_DIRTY_D BIT(7)
	36	#define CMD_ROOT_OFF BIT(31)
	37
	38	#define CFG_REG 0x4
	39	#define CFG_SRC_DIV_SHIFT 0
	40	#define CFG_SRC_SEL_SHIFT 8
	41	#define CFG_SRC_SEL_MASK (0x7 << CFG_SRC_SEL_SHIFT)
	42	#define CFG_MODE_SHIFT 12
	43	#define CFG_MODE_MASK (0x3 << CFG_MODE_SHIFT)
	44	#define CFG_MODE_DUAL_EDGE (0x2 << CFG_MODE_SHIFT)
	45
	46	#define M_REG 0x8
	47	#define N_REG 0xc
	48	#define D_REG 0x10
	49
	50	static int clk_rcg2_is_enabled(struct clk_hw *hw)
	51	{
	52	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
	53	u32 cmd;
	54	int ret;
	55
	56	ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG, &cmd);
	57	if (ret)
	58	return ret;
	59
aa014149	60	return (cmd & CMD_ROOT_OFF) == 0;
bcd61c0f SB	61	}
	62
	63	static u8 clk_rcg2_get_parent(struct clk_hw *hw)
	64	{
	65	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
	66	int num_parents = __clk_get_num_parents(hw->clk);
	67	u32 cfg;
	68	int i, ret;
	69
	70	ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg);
	71	if (ret)
7f218978	72	goto err;
bcd61c0f SB	73
	74	cfg &= CFG_SRC_SEL_MASK;
	75	cfg >>= CFG_SRC_SEL_SHIFT;
	76
	77	for (i = 0; i < num_parents; i++)
293d2e97	78	if (cfg == rcg->parent_map[i].cfg)
bcd61c0f SB	79	return i;
bcd61c0f SB	80
7f218978 GD	81	err:
	82	pr_debug("%s: Clock %s has invalid parent, using default.\n",
	83	__func__, __clk_get_name(hw->clk));
	84	return 0;
bcd61c0f SB	85	}
	86
	87	static int update_config(struct clk_rcg2 *rcg)
	88	{
	89	int count, ret;
	90	u32 cmd;
	91	struct clk_hw *hw = &rcg->clkr.hw;
	92	const char *name = __clk_get_name(hw->clk);
	93
	94	ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG,
	95	CMD_UPDATE, CMD_UPDATE);
	96	if (ret)
	97	return ret;
	98
	99	/* Wait for update to take effect */
	100	for (count = 500; count > 0; count--) {
	101	ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG, &cmd);
	102	if (ret)
	103	return ret;
	104	if (!(cmd & CMD_UPDATE))
	105	return 0;
	106	udelay(1);
	107	}
	108
	109	WARN(1, "%s: rcg didn't update its configuration.", name);
	110	return 0;
	111	}
	112
	113	static int clk_rcg2_set_parent(struct clk_hw *hw, u8 index)
	114	{
	115	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
	116	int ret;
293d2e97	117	u32 cfg = rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT;
bcd61c0f SB	118
bcd61c0f SB	119	ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
293d2e97	120	CFG_SRC_SEL_MASK, cfg);
bcd61c0f SB	121	if (ret)
	122	return ret;
	123
	124	return update_config(rcg);
	125	}
	126
	127	/*
	128	* Calculate m/n:d rate
	129	*
	130	* parent_rate m
	131	* rate = ----------- x ---
	132	* hid_div n
	133	*/
	134	static unsigned long
	135	calc_rate(unsigned long rate, u32 m, u32 n, u32 mode, u32 hid_div)
	136	{
	137	if (hid_div) {
	138	rate *= 2;
	139	rate /= hid_div + 1;
	140	}
	141
	142	if (mode) {
	143	u64 tmp = rate;
	144	tmp *= m;
	145	do_div(tmp, n);
	146	rate = tmp;
	147	}
	148
	149	return rate;
	150	}
	151
	152	static unsigned long
	153	clk_rcg2_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
	154	{
	155	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
	156	u32 cfg, hid_div, m = 0, n = 0, mode = 0, mask;
	157
	158	regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg);
	159
	160	if (rcg->mnd_width) {
	161	mask = BIT(rcg->mnd_width) - 1;
	162	regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + M_REG, &m);
	163	m &= mask;
	164	regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + N_REG, &n);
	165	n = ~n;
	166	n &= mask;
	167	n += m;
	168	mode = cfg & CFG_MODE_MASK;
	169	mode >>= CFG_MODE_SHIFT;
	170	}
	171
	172	mask = BIT(rcg->hid_width) - 1;
	173	hid_div = cfg >> CFG_SRC_DIV_SHIFT;
	174	hid_div &= mask;
	175
	176	return calc_rate(parent_rate, m, n, mode, hid_div);
	177	}
	178
bcd61c0f SB	179	static long _freq_tbl_determine_rate(struct clk_hw *hw,
bcd61c0f SB	180	const struct freq_tbl *f, unsigned long rate,
646cafc6	181	unsigned long p_rate, struct clk_hw *p_hw)
bcd61c0f SB	182	{
bcd61c0f SB	183	unsigned long clk_flags;
646cafc6	184	struct clk *p;
bcd61c0f	185
50c6a503	186	f = qcom_find_freq(f, rate);
bcd61c0f SB	187	if (!f)
	188	return -EINVAL;
	189
	190	clk_flags = __clk_get_flags(hw->clk);
646cafc6	191	p = clk_get_parent_by_index(hw->clk, f->src);
bcd61c0f SB	192	if (clk_flags & CLK_SET_RATE_PARENT) {
	193	if (f->pre_div) {
	194	rate /= 2;
	195	rate *= f->pre_div + 1;
	196	}
	197
	198	if (f->n) {
	199	u64 tmp = rate;
	200	tmp = tmp * f->n;
	201	do_div(tmp, f->m);
	202	rate = tmp;
	203	}
	204	} else {
646cafc6	205	rate = __clk_get_rate(p);
bcd61c0f	206	}
646cafc6	207	*p_hw = __clk_get_hw(p);
bcd61c0f SB	208	*p_rate = rate;
	209
	210	return f->freq;
	211	}
	212
	213	static long clk_rcg2_determine_rate(struct clk_hw *hw, unsigned long rate,
1c8e6004	214	unsigned long min_rate, unsigned long max_rate,
646cafc6	215	unsigned long p_rate, struct clk_hw *p)
bcd61c0f SB	216	{
	217	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
	218
	219	return _freq_tbl_determine_rate(hw, rcg->freq_tbl, rate, p_rate, p);
	220	}
	221
99cbd064	222	static int clk_rcg2_configure(struct clk_rcg2 rcg, const struct freq_tbl f)
bcd61c0f	223	{
bcd61c0f	224	u32 cfg, mask;
293d2e97 GD	225	struct clk_hw *hw = &rcg->clkr.hw;
	226	int ret, index = qcom_find_src_index(hw, rcg->parent_map, f->src);
	227
	228	if (index < 0)
	229	return index;
bcd61c0f	230
bcd61c0f SB	231	if (rcg->mnd_width && f->n) {
bcd61c0f SB	232	mask = BIT(rcg->mnd_width) - 1;
99cbd064 SB	233	ret = regmap_update_bits(rcg->clkr.regmap,
99cbd064 SB	234	rcg->cmd_rcgr + M_REG, mask, f->m);
bcd61c0f SB	235	if (ret)
	236	return ret;
	237
99cbd064 SB	238	ret = regmap_update_bits(rcg->clkr.regmap,
99cbd064 SB	239	rcg->cmd_rcgr + N_REG, mask, ~(f->n - f->m));
bcd61c0f SB	240	if (ret)
	241	return ret;
	242
99cbd064 SB	243	ret = regmap_update_bits(rcg->clkr.regmap,
99cbd064 SB	244	rcg->cmd_rcgr + D_REG, mask, ~f->n);
bcd61c0f SB	245	if (ret)
	246	return ret;
	247	}
	248
	249	mask = BIT(rcg->hid_width) - 1;
	250	mask \|= CFG_SRC_SEL_MASK \| CFG_MODE_MASK;
	251	cfg = f->pre_div << CFG_SRC_DIV_SHIFT;
293d2e97	252	cfg \|= rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT;
0b21503d	253	if (rcg->mnd_width && f->n && (f->m != f->n))
bcd61c0f	254	cfg \|= CFG_MODE_DUAL_EDGE;
99cbd064 SB	255	ret = regmap_update_bits(rcg->clkr.regmap,
99cbd064 SB	256	rcg->cmd_rcgr + CFG_REG, mask, cfg);
bcd61c0f SB	257	if (ret)
	258	return ret;
	259
	260	return update_config(rcg);
	261	}
	262
99cbd064 SB	263	static int __clk_rcg2_set_rate(struct clk_hw *hw, unsigned long rate)
	264	{
	265	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
	266	const struct freq_tbl *f;
	267
50c6a503	268	f = qcom_find_freq(rcg->freq_tbl, rate);
99cbd064 SB	269	if (!f)
	270	return -EINVAL;
	271
	272	return clk_rcg2_configure(rcg, f);
	273	}
	274
bcd61c0f SB	275	static int clk_rcg2_set_rate(struct clk_hw *hw, unsigned long rate,
	276	unsigned long parent_rate)
	277	{
	278	return __clk_rcg2_set_rate(hw, rate);
	279	}
	280
	281	static int clk_rcg2_set_rate_and_parent(struct clk_hw *hw,
	282	unsigned long rate, unsigned long parent_rate, u8 index)
	283	{
	284	return __clk_rcg2_set_rate(hw, rate);
	285	}
	286
	287	const struct clk_ops clk_rcg2_ops = {
	288	.is_enabled = clk_rcg2_is_enabled,
	289	.get_parent = clk_rcg2_get_parent,
	290	.set_parent = clk_rcg2_set_parent,
	291	.recalc_rate = clk_rcg2_recalc_rate,
	292	.determine_rate = clk_rcg2_determine_rate,
	293	.set_rate = clk_rcg2_set_rate,
	294	.set_rate_and_parent = clk_rcg2_set_rate_and_parent,
	295	};
	296	EXPORT_SYMBOL_GPL(clk_rcg2_ops);
99cbd064 SB	297
	298	struct frac_entry {
	299	int num;
	300	int den;
	301	};
	302
	303	static const struct frac_entry frac_table_675m[] = { /* link rate of 270M */
	304	{ 52, 295 }, /* 119 M */
	305	{ 11, 57 }, /* 130.25 M */
	306	{ 63, 307 }, /* 138.50 M */
	307	{ 11, 50 }, /* 148.50 M */
	308	{ 47, 206 }, /* 154 M */
	309	{ 31, 100 }, /* 205.25 M */
	310	{ 107, 269 }, /* 268.50 M */
	311	{ },
	312	};
	313
	314	static struct frac_entry frac_table_810m[] = { /* Link rate of 162M */
	315	{ 31, 211 }, /* 119 M */
	316	{ 32, 199 }, /* 130.25 M */
	317	{ 63, 307 }, /* 138.50 M */
	318	{ 11, 60 }, /* 148.50 M */
	319	{ 50, 263 }, /* 154 M */
	320	{ 31, 120 }, /* 205.25 M */
	321	{ 119, 359 }, /* 268.50 M */
	322	{ },
	323	};
	324
	325	static int clk_edp_pixel_set_rate(struct clk_hw *hw, unsigned long rate,
	326	unsigned long parent_rate)
	327	{
	328	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
	329	struct freq_tbl f = *rcg->freq_tbl;
	330	const struct frac_entry *frac;
	331	int delta = 100000;
	332	s64 src_rate = parent_rate;
	333	s64 request;
	334	u32 mask = BIT(rcg->hid_width) - 1;
	335	u32 hid_div;
	336
	337	if (src_rate == 810000000)
	338	frac = frac_table_810m;
	339	else
	340	frac = frac_table_675m;
	341
	342	for (; frac->num; frac++) {
	343	request = rate;
	344	request *= frac->den;
	345	request = div_s64(request, frac->num);
	346	if ((src_rate < (request - delta)) \|\|
	347	(src_rate > (request + delta)))
	348	continue;
	349
	350	regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
	351	&hid_div);
	352	f.pre_div = hid_div;
	353	f.pre_div >>= CFG_SRC_DIV_SHIFT;
	354	f.pre_div &= mask;
	355	f.m = frac->num;
	356	f.n = frac->den;
	357
	358	return clk_rcg2_configure(rcg, &f);
	359	}
	360
361	return -EINVAL;
362	}
363
364	static int clk_edp_pixel_set_rate_and_parent(struct clk_hw *hw,
365	unsigned long rate, unsigned long parent_rate, u8 index)
366	{
367	/* Parent index is set statically in frequency table */
368	return clk_edp_pixel_set_rate(hw, rate, parent_rate);
369	}
370
371	static long clk_edp_pixel_determine_rate(struct clk_hw *hw, unsigned long rate,
1c8e6004 TV	372	unsigned long min_rate,
1c8e6004 TV	373	unsigned long max_rate,
646cafc6	374	unsigned long p_rate, struct clk_hw *p)
99cbd064 SB	375	{
	376	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
	377	const struct freq_tbl *f = rcg->freq_tbl;
	378	const struct frac_entry *frac;
	379	int delta = 100000;
	380	s64 src_rate = *p_rate;
	381	s64 request;
	382	u32 mask = BIT(rcg->hid_width) - 1;
	383	u32 hid_div;
	384
	385	/* Force the correct parent */
646cafc6	386	*p = __clk_get_hw(clk_get_parent_by_index(hw->clk, f->src));
99cbd064 SB	387
	388	if (src_rate == 810000000)
	389	frac = frac_table_810m;
	390	else
	391	frac = frac_table_675m;
	392
	393	for (; frac->num; frac++) {
	394	request = rate;
	395	request *= frac->den;
	396	request = div_s64(request, frac->num);
	397	if ((src_rate < (request - delta)) \|\|
	398	(src_rate > (request + delta)))
	399	continue;
	400
	401	regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
	402	&hid_div);
	403	hid_div >>= CFG_SRC_DIV_SHIFT;
	404	hid_div &= mask;
	405
	406	return calc_rate(src_rate, frac->num, frac->den, !!frac->den,
	407	hid_div);
	408	}
	409
	410	return -EINVAL;
	411	}
	412
	413	const struct clk_ops clk_edp_pixel_ops = {
	414	.is_enabled = clk_rcg2_is_enabled,
	415	.get_parent = clk_rcg2_get_parent,
	416	.set_parent = clk_rcg2_set_parent,
	417	.recalc_rate = clk_rcg2_recalc_rate,
	418	.set_rate = clk_edp_pixel_set_rate,
	419	.set_rate_and_parent = clk_edp_pixel_set_rate_and_parent,
	420	.determine_rate = clk_edp_pixel_determine_rate,
	421	};
	422	EXPORT_SYMBOL_GPL(clk_edp_pixel_ops);
	423
	424	static long clk_byte_determine_rate(struct clk_hw *hw, unsigned long rate,
1c8e6004	425	unsigned long min_rate, unsigned long max_rate,
646cafc6	426	unsigned long p_rate, struct clk_hw *p_hw)
99cbd064 SB	427	{
	428	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
	429	const struct freq_tbl *f = rcg->freq_tbl;
	430	unsigned long parent_rate, div;
	431	u32 mask = BIT(rcg->hid_width) - 1;
646cafc6	432	struct clk *p;
99cbd064 SB	433
	434	if (rate == 0)
	435	return -EINVAL;
	436
646cafc6 TV	437	p = clk_get_parent_by_index(hw->clk, f->src);
	438	*p_hw = __clk_get_hw(p);
	439	*p_rate = parent_rate = __clk_round_rate(p, rate);
99cbd064 SB	440
	441	div = DIV_ROUND_UP((2 * parent_rate), rate) - 1;
	442	div = min_t(u32, div, mask);
	443
	444	return calc_rate(parent_rate, 0, 0, 0, div);
	445	}
	446
	447	static int clk_byte_set_rate(struct clk_hw *hw, unsigned long rate,
	448	unsigned long parent_rate)
	449	{
	450	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
	451	struct freq_tbl f = *rcg->freq_tbl;
	452	unsigned long div;
	453	u32 mask = BIT(rcg->hid_width) - 1;
	454
	455	div = DIV_ROUND_UP((2 * parent_rate), rate) - 1;
	456	div = min_t(u32, div, mask);
	457
	458	f.pre_div = div;
	459
	460	return clk_rcg2_configure(rcg, &f);
	461	}
	462
	463	static int clk_byte_set_rate_and_parent(struct clk_hw *hw,
	464	unsigned long rate, unsigned long parent_rate, u8 index)
	465	{
	466	/* Parent index is set statically in frequency table */
	467	return clk_byte_set_rate(hw, rate, parent_rate);
	468	}
	469
	470	const struct clk_ops clk_byte_ops = {
	471	.is_enabled = clk_rcg2_is_enabled,
	472	.get_parent = clk_rcg2_get_parent,
	473	.set_parent = clk_rcg2_set_parent,
	474	.recalc_rate = clk_rcg2_recalc_rate,
	475	.set_rate = clk_byte_set_rate,
	476	.set_rate_and_parent = clk_byte_set_rate_and_parent,
	477	.determine_rate = clk_byte_determine_rate,
	478	};
	479	EXPORT_SYMBOL_GPL(clk_byte_ops);
	480
	481	static const struct frac_entry frac_table_pixel[] = {
	482	{ 3, 8 },
	483	{ 2, 9 },
	484	{ 4, 9 },
	485	{ 1, 1 },
	486	{ }
	487	};
	488
	489	static long clk_pixel_determine_rate(struct clk_hw *hw, unsigned long rate,
1c8e6004 TV	490	unsigned long min_rate,
1c8e6004 TV	491	unsigned long max_rate,
646cafc6	492	unsigned long p_rate, struct clk_hw *p)
99cbd064 SB	493	{
	494	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
	495	unsigned long request, src_rate;
	496	int delta = 100000;
	497	const struct freq_tbl *f = rcg->freq_tbl;
	498	const struct frac_entry *frac = frac_table_pixel;
646cafc6 TV	499	struct clk *parent = clk_get_parent_by_index(hw->clk, f->src);
	500
	501	*p = __clk_get_hw(parent);
99cbd064 SB	502
	503	for (; frac->num; frac++) {
	504	request = (rate * frac->den) / frac->num;
	505
	506	src_rate = __clk_round_rate(parent, request);
	507	if ((src_rate < (request - delta)) \|\|
	508	(src_rate > (request + delta)))
	509	continue;
	510
	511	*p_rate = src_rate;
	512	return (src_rate * frac->num) / frac->den;
	513	}
	514
	515	return -EINVAL;
	516	}
	517
	518	static int clk_pixel_set_rate(struct clk_hw *hw, unsigned long rate,
	519	unsigned long parent_rate)
	520	{
	521	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
	522	struct freq_tbl f = *rcg->freq_tbl;
	523	const struct frac_entry *frac = frac_table_pixel;
	524	unsigned long request, src_rate;
	525	int delta = 100000;
	526	u32 mask = BIT(rcg->hid_width) - 1;
	527	u32 hid_div;
	528	struct clk *parent = clk_get_parent_by_index(hw->clk, f.src);
	529
	530	for (; frac->num; frac++) {
	531	request = (rate * frac->den) / frac->num;
	532
	533	src_rate = __clk_round_rate(parent, request);
	534	if ((src_rate < (request - delta)) \|\|
	535	(src_rate > (request + delta)))
	536	continue;
	537
	538	regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
	539	&hid_div);
	540	f.pre_div = hid_div;
	541	f.pre_div >>= CFG_SRC_DIV_SHIFT;
	542	f.pre_div &= mask;
	543	f.m = frac->num;
	544	f.n = frac->den;
	545
	546	return clk_rcg2_configure(rcg, &f);
	547	}
	548	return -EINVAL;
	549	}
	550
	551	static int clk_pixel_set_rate_and_parent(struct clk_hw *hw, unsigned long rate,
	552	unsigned long parent_rate, u8 index)
	553	{
	554	/* Parent index is set statically in frequency table */
	555	return clk_pixel_set_rate(hw, rate, parent_rate);
	556	}
	557
	558	const struct clk_ops clk_pixel_ops = {
	559	.is_enabled = clk_rcg2_is_enabled,
	560	.get_parent = clk_rcg2_get_parent,
	561	.set_parent = clk_rcg2_set_parent,
	562	.recalc_rate = clk_rcg2_recalc_rate,
	563	.set_rate = clk_pixel_set_rate,
	564	.set_rate_and_parent = clk_pixel_set_rate_and_parent,
	565	.determine_rate = clk_pixel_determine_rate,
566	};
567	EXPORT_SYMBOL_GPL(clk_pixel_ops);