ipq806x: update clk-qcom patches

Preparing for cpufreq driver switch to generic cpufreq-dt

Signed-off-by: Pavel Kubelun <be.dissent@gmail.com>

1 files changed, 386 insertions, 0 deletions

diff --git a/target/linux/ipq806x/patches-4.4/175-add-regmap-mux-div.patch b/target/linux/ipq806x/patches-4.4/175-add-regmap-mux-div.patch
new file mode 100644
index 0000000000..b5c23b5165
--- /dev/null
+++ b/target/linux/ipq806x/patches-4.4/175-add-regmap-mux-div.patch
@@ -0,0 +1,386 @@
+From 7727b1cae43e9abac746ef016c3dbf50ee81a6d6 Mon Sep 17 00:00:00 2001
+From: Georgi Djakov <georgi.djakov@linaro.org>
+Date: Wed, 18 Mar 2015 17:23:29 +0200
+Subject: clk: qcom: Add support for regmap mux-div clocks
+
+Add support for hardware that support switching both parent clocks and the
+divider at the same time. This avoids generating intermediate frequencies
+from either the old parent clock and new divider or new parent clock and
+old divider combinations.
+
+Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
+---
+ drivers/clk/qcom/Makefile             |   1 +
+ drivers/clk/qcom/clk-regmap-mux-div.c | 288 ++++++++++++++++++++++++++++++++++
+ drivers/clk/qcom/clk-regmap-mux-div.h |  63 ++++++++
+ 3 files changed, 352 insertions(+)
+ create mode 100644 drivers/clk/qcom/clk-regmap-mux-div.c
+ create mode 100644 drivers/clk/qcom/clk-regmap-mux-div.h
+
+--- a/drivers/clk/qcom/Makefile
++++ b/drivers/clk/qcom/Makefile
+@@ -8,6 +8,7 @@ clk-qcom-y += clk-rcg2.o
+ clk-qcom-y += clk-branch.o
+ clk-qcom-y += clk-regmap-divider.o
+ clk-qcom-y += clk-regmap-mux.o
++clk-qcom-y += clk-regmap-mux-div.o
+ clk-qcom-$(CONFIG_KRAIT_CLOCKS) += clk-krait.o
+ obj-$(CONFIG_KPSS_XCC) += kpss-xcc.o
+ clk-qcom-y += clk-hfpll.o
+--- /dev/null
++++ b/drivers/clk/qcom/clk-regmap-mux-div.c
+@@ -0,0 +1,288 @@
++/*
++ * Copyright (c) 2015, Linaro Limited
++ * Copyright (c) 2014, 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/bitops.h>
++#include <linux/clk.h>
++#include <linux/delay.h>
++#include <linux/export.h>
++#include <linux/kernel.h>
++#include <linux/regmap.h>
++
++#include "clk-regmap-mux-div.h"
++
++#define CMD_RCGR			0x0
++#define CMD_RCGR_UPDATE			BIT(0)
++#define CMD_RCGR_DIRTY_CFG		BIT(4)
++#define CMD_RCGR_ROOT_OFF		BIT(31)
++#define CFG_RCGR			0x4
++
++static int __mux_div_update_config(struct clk_regmap_mux_div *md)
++{
++	int ret;
++	u32 val, count;
++	const char *name = clk_hw_get_name(&md->clkr.hw);
++
++	ret = regmap_update_bits(md->clkr.regmap, CMD_RCGR + md->reg_offset,
++				 CMD_RCGR_UPDATE, CMD_RCGR_UPDATE);
++	if (ret)
++		return ret;
++
++	/* Wait for update to take effect */
++	for (count = 500; count > 0; count--) {
++		ret = regmap_read(md->clkr.regmap, CMD_RCGR + md->reg_offset,
++				  &val);
++		if (ret)
++			return ret;
++		if (!(val & CMD_RCGR_UPDATE))
++			return 0;
++		udelay(1);
++	}
++
++	pr_err("%s: RCG did not update its configuration", name);
++	return -EBUSY;
++}
++
++static int __mux_div_set_src_div(struct clk_regmap_mux_div *md, u32 src_sel,
++				 u32 src_div)
++{
++	int ret;
++	u32 val, mask;
++
++	val = (src_div << md->hid_shift) | (src_sel << md->src_shift);
++	mask = ((BIT(md->hid_width) - 1) << md->hid_shift) |
++	       ((BIT(md->src_width) - 1) << md->src_shift);
++
++	ret = regmap_update_bits(md->clkr.regmap, CFG_RCGR + md->reg_offset,
++				 mask, val);
++	if (ret)
++		return ret;
++
++	return __mux_div_update_config(md);
++}
++
++static void __mux_div_get_src_div(struct clk_regmap_mux_div *md, u32 *src_sel,
++				  u32 *src_div)
++{
++	u32 val, div, src;
++	const char *name = clk_hw_get_name(&md->clkr.hw);
++
++	regmap_read(md->clkr.regmap, CMD_RCGR + md->reg_offset, &val);
++
++	if (val & CMD_RCGR_DIRTY_CFG) {
++		pr_err("%s: RCG configuration is pending\n", name);
++		return;
++	}
++
++	regmap_read(md->clkr.regmap, CFG_RCGR + md->reg_offset, &val);
++	src = (val >> md->src_shift);
++	src &= BIT(md->src_width) - 1;
++	*src_sel = src;
++
++	div = (val >> md->hid_shift);
++	div &= BIT(md->hid_width) - 1;
++	*src_div = div;
++}
++
++static int mux_div_enable(struct clk_hw *hw)
++{
++	struct clk_regmap_mux_div *md = to_clk_regmap_mux_div(hw);
++
++	return __mux_div_set_src_div(md, md->src_sel, md->div);
++}
++
++static inline bool is_better_rate(unsigned long req, unsigned long best,
++				  unsigned long new)
++{
++	return (req <= new && new < best) || (best < req && best < new);
++}
++
++static int mux_div_determine_rate(struct clk_hw *hw,
++				  struct clk_rate_request *req)
++{
++	struct clk_regmap_mux_div *md = to_clk_regmap_mux_div(hw);
++	unsigned int i, div, max_div;
++	unsigned long actual_rate, best_rate = 0;
++	unsigned long req_rate = req->rate;
++
++	for (i = 0; i < clk_hw_get_num_parents(hw); i++) {
++		struct clk_hw *parent = clk_hw_get_parent_by_index(hw, i);
++		unsigned long parent_rate = clk_hw_get_rate(parent);
++
++		max_div = BIT(md->hid_width) - 1;
++		for (div = 1; div < max_div; div++) {
++			parent_rate = mult_frac(req_rate, div, 2);
++			parent_rate = clk_hw_round_rate(parent, parent_rate);
++			actual_rate = mult_frac(parent_rate, 2, div);
++
++			if (is_better_rate(req_rate, best_rate, actual_rate)) {
++				best_rate = actual_rate;
++				req->rate = best_rate;
++				req->best_parent_rate = parent_rate;
++				req->best_parent_hw = parent;
++			}
++
++			if (actual_rate < req_rate || best_rate <= req_rate)
++				break;
++		}
++	}
++
++	if (!best_rate)
++		return -EINVAL;
++
++	return 0;
++}
++
++static int __mux_div_set_rate_and_parent(struct clk_hw *hw, unsigned long rate,
++					 unsigned long prate, u32 src_sel)
++{
++	struct clk_regmap_mux_div *md = to_clk_regmap_mux_div(hw);
++	int ret, i;
++	u32 div, max_div, best_src = 0, best_div = 0;
++	unsigned long actual_rate, best_rate = 0;
++
++	for (i = 0; i < clk_hw_get_num_parents(hw); i++) {
++		struct clk_hw *parent = clk_hw_get_parent_by_index(hw, i);
++		unsigned long parent_rate = clk_hw_get_rate(parent);
++
++		max_div = BIT(md->hid_width) - 1;
++		for (div = 1; div < max_div; div++) {
++			parent_rate = mult_frac(rate, div, 2);
++			parent_rate = clk_hw_round_rate(parent, parent_rate);
++			actual_rate = mult_frac(parent_rate, 2, div);
++
++			if (is_better_rate(rate, best_rate, actual_rate)) {
++				best_rate = actual_rate;
++				best_src = md->parent_map[i].cfg;
++				best_div = div - 1;
++			}
++
++			if (actual_rate < rate || best_rate <= rate)
++				break;
++		}
++	}
++
++	ret = __mux_div_set_src_div(md, best_src, best_div);
++	if (!ret) {
++		md->div = best_div;
++		md->src_sel = best_src;
++	}
++
++	return ret;
++}
++
++static u8 mux_div_get_parent(struct clk_hw *hw)
++{
++	struct clk_regmap_mux_div *md = to_clk_regmap_mux_div(hw);
++	const char *name = clk_hw_get_name(hw);
++	u32 i, div, src;
++
++	__mux_div_get_src_div(md, &src, &div);
++
++	for (i = 0; i < clk_hw_get_num_parents(hw); i++)
++		if (src == md->parent_map[i].cfg)
++			return i;
++
++	pr_err("%s: Can't find parent %d\n", name, src);
++	return 0;
++}
++
++static int mux_div_set_parent(struct clk_hw *hw, u8 index)
++{
++	struct clk_regmap_mux_div *md = to_clk_regmap_mux_div(hw);
++
++	return __mux_div_set_src_div(md, md->parent_map[index].cfg, md->div);
++}
++
++static int mux_div_set_rate(struct clk_hw *hw,
++			    unsigned long rate, unsigned long prate)
++{
++	struct clk_regmap_mux_div *md = to_clk_regmap_mux_div(hw);
++
++	return __mux_div_set_rate_and_parent(hw, rate, prate, md->src_sel);
++}
++
++static int mux_div_set_rate_and_parent(struct clk_hw *hw,  unsigned long rate,
++				       unsigned long prate, u8 index)
++{
++	struct clk_regmap_mux_div *md = to_clk_regmap_mux_div(hw);
++
++	return __mux_div_set_rate_and_parent(hw, rate, prate,
++					     md->parent_map[index].cfg);
++}
++
++static unsigned long mux_div_recalc_rate(struct clk_hw *hw, unsigned long prate)
++{
++	struct clk_regmap_mux_div *md = to_clk_regmap_mux_div(hw);
++	u32 div, src;
++	int i, num_parents = clk_hw_get_num_parents(hw);
++	const char *name = clk_hw_get_name(hw);
++
++	__mux_div_get_src_div(md, &src, &div);
++	for (i = 0; i < num_parents; i++)
++		if (src == md->parent_map[i].cfg) {
++			struct clk_hw *p = clk_hw_get_parent_by_index(hw, i);
++			unsigned long parent_rate = clk_hw_get_rate(p);
++
++			return mult_frac(parent_rate, 2, div + 1);
++		}
++
++	pr_err("%s: Can't find parent %d\n", name, src);
++	return 0;
++}
++
++static struct clk_hw *mux_div_get_safe_parent(struct clk_hw *hw,
++					      unsigned long *safe_freq)
++{
++	int i;
++	struct clk_regmap_mux_div *md = to_clk_regmap_mux_div(hw);
++
++	if (md->safe_freq)
++		*safe_freq = md->safe_freq;
++
++	for (i = 0; i < clk_hw_get_num_parents(hw); i++)
++		if (md->safe_src == md->parent_map[i].cfg)
++			break;
++
++	return clk_hw_get_parent_by_index(hw, i);
++}
++
++static void mux_div_disable(struct clk_hw *hw)
++{
++	struct clk_regmap_mux_div *md = to_clk_regmap_mux_div(hw);
++	struct clk_hw *parent;
++	u32 div;
++
++	if (!md->safe_freq || !md->safe_src)
++		return;
++
++	parent = mux_div_get_safe_parent(hw, &md->safe_freq);
++	div = divider_get_val(md->safe_freq, clk_get_rate(parent->clk), NULL,
++			      md->hid_width, CLK_DIVIDER_ROUND_CLOSEST);
++	div = 2 * div + 1;
++
++	__mux_div_set_src_div(md, md->safe_src, div);
++}
++
++const struct clk_ops clk_regmap_mux_div_ops = {
++	.enable = mux_div_enable,
++	.disable = mux_div_disable,
++	.get_parent = mux_div_get_parent,
++	.set_parent = mux_div_set_parent,
++	.set_rate = mux_div_set_rate,
++	.set_rate_and_parent = mux_div_set_rate_and_parent,
++	.determine_rate = mux_div_determine_rate,
++	.recalc_rate = mux_div_recalc_rate,
++	.get_safe_parent = mux_div_get_safe_parent,
++};
++EXPORT_SYMBOL_GPL(clk_regmap_mux_div_ops);
+--- /dev/null
++++ b/drivers/clk/qcom/clk-regmap-mux-div.h
+@@ -0,0 +1,63 @@
++/*
++ * Copyright (c) 2015, Linaro Limited
++ * Copyright (c) 2014, 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.
++ */
++
++#ifndef __QCOM_CLK_REGMAP_MUX_DIV_H__
++#define __QCOM_CLK_REGMAP_MUX_DIV_H__
++
++#include <linux/clk-provider.h>
++#include "clk-regmap.h"
++#include "clk-rcg.h"
++
++/**
++ * struct mux_div_clk - combined mux/divider clock
++ * @reg_offset: offset of the mux/divider register
++ * @hid_width:	number of bits in half integer divider
++ * @hid_shift:	lowest bit of hid value field
++ * @src_width:	number of bits in source select
++ * @src_shift:	lowest bit of source select field
++ * @div:	the divider raw configuration value
++ * @src_sel:	the mux index which will be used if the clock is enabled
++ * @safe_src:	the safe source mux index for this clock
++ * @safe_freq:	When switching rates from A to B, the mux div clock will
++ *		instead switch from A -> safe_freq -> B. This allows the
++ *		mux_div clock to change rates while enabled, even if this
++ *		behavior is not supported by the parent clocks.
++ *		If changing the rate of parent A also causes the rate of
++ *		parent B to change, then safe_freq must be defined.
++ *		safe_freq is expected to have a source clock which is always
++ *		on and runs at only one rate.
++ * @parent_map:	pointer to parent_map struct
++ * @clkr:	handle between common and hardware-specific interfaces
++ */
++
++struct clk_regmap_mux_div {
++	u32				reg_offset;
++	u32				hid_width;
++	u32				hid_shift;
++	u32				src_width;
++	u32				src_shift;
++	u32				div;
++	u32				src_sel;
++	u32				safe_src;
++	unsigned long			safe_freq;
++	const struct parent_map		*parent_map;
++	struct clk_regmap		clkr;
++};
++
++#define to_clk_regmap_mux_div(_hw) \
++	container_of(to_clk_regmap(_hw), struct clk_regmap_mux_div, clkr)
++
++extern const struct clk_ops clk_regmap_mux_div_ops;
++
++#endif