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Merge branch 'clk-exynos-cpu-clk' into clk-next 

Folded into this merge commit is a build error fix: s/clk/core in
clk_change_rate due to the new struct clk_core
hifive-unleashed-5.1
Michael Turquette 2015-06-20 12:18:03 -07:00
parent ddfb157444 8eb92ab68f
commit 85e88fab13
12 changed files with 471 additions and 212 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
arch/arm/mach-exynos/exynos.c
View File

@ -224,6 +224,25 @@ static void __init exynos_init_irq(void)
exynos_map_pmu();
}
static const struct of_device_id exynos_cpufreq_matches[] = {
{ .compatible = "samsung,exynos4210", .data = "cpufreq-dt" },
{ /* sentinel */ }
};
static void __init exynos_cpufreq_init(void)
{
struct device_node *root = of_find_node_by_path("/");
const struct of_device_id *match;
match = of_match_node(exynos_cpufreq_matches, root);
if (!match) {
platform_device_register_simple("exynos-cpufreq", -1, NULL, 0);
return;
}
platform_device_register_simple(match->data, -1, NULL, 0);
}
static void __init exynos_dt_machine_init(void)
{
/*
@ -245,7 +264,7 @@ static void __init exynos_dt_machine_init(void)
of_machine_is_compatible("samsung,exynos5250"))
platform_device_register(&exynos_cpuidle);
platform_device_register_simple("exynos-cpufreq", -1, NULL, 0);
exynos_cpufreq_init();
of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
}

3
drivers/clk/clk.c
View File

@ -1417,6 +1417,9 @@ static void clk_change_rate(struct clk_core *core)
if (core->notifier_count && old_rate != core->rate)
__clk_notify(core, POST_RATE_CHANGE, old_rate, core->rate);
if (core->flags & CLK_RECALC_NEW_RATES)
(void)clk_calc_new_rates(core, core->new_rate);
/*
* Use safe iteration, as change_rate can actually swap parents
* for certain clock types.

2
drivers/clk/samsung/Makefile
View File

@ -2,7 +2,7 @@
# Samsung Clock specific Makefile
#
obj-$(CONFIG_COMMON_CLK) += clk.o clk-pll.o
obj-$(CONFIG_COMMON_CLK) += clk.o clk-pll.o clk-cpu.o
obj-$(CONFIG_SOC_EXYNOS3250) += clk-exynos3250.o
obj-$(CONFIG_ARCH_EXYNOS4) += clk-exynos4.o
obj-$(CONFIG_SOC_EXYNOS4415) += clk-exynos4415.o

349
drivers/clk/samsung/clk-cpu.c 100644
View File

@ -0,0 +1,349 @@
/*
* Copyright (c) 2014 Samsung Electronics Co., Ltd.
* Author: Thomas Abraham <thomas.ab@samsung.com>
*
* Copyright (c) 2015 Samsung Electronics Co., Ltd.
* Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
*
* 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.
*
* This file contains the utility function to register CPU clock for Samsung
* Exynos platforms. A CPU clock is defined as a clock supplied to a CPU or a
* group of CPUs. The CPU clock is typically derived from a hierarchy of clock
* blocks which includes mux and divider blocks. There are a number of other
* auxiliary clocks supplied to the CPU domain such as the debug blocks and AXI
* clock for CPU domain. The rates of these auxiliary clocks are related to the
* CPU clock rate and this relation is usually specified in the hardware manual
* of the SoC or supplied after the SoC characterization.
*
* The below implementation of the CPU clock allows the rate changes of the CPU
* clock and the corresponding rate changes of the auxillary clocks of the CPU
* domain. The platform clock driver provides a clock register configuration
* for each configurable rate which is then used to program the clock hardware
* registers to acheive a fast co-oridinated rate change for all the CPU domain
* clocks.
*
* On a rate change request for the CPU clock, the rate change is propagated
* upto the PLL supplying the clock to the CPU domain clock blocks. While the
* CPU domain PLL is reconfigured, the CPU domain clocks are driven using an
* alternate clock source. If required, the alternate clock source is divided
* down in order to keep the output clock rate within the previous OPP limits.
*/
#include <linux/errno.h>
#include "clk-cpu.h"
#define E4210_SRC_CPU 0x0
#define E4210_STAT_CPU 0x200
#define E4210_DIV_CPU0 0x300
#define E4210_DIV_CPU1 0x304
#define E4210_DIV_STAT_CPU0 0x400
#define E4210_DIV_STAT_CPU1 0x404
#define E4210_DIV0_RATIO0_MASK 0x7
#define E4210_DIV1_HPM_MASK (0x7 << 4)
#define E4210_DIV1_COPY_MASK (0x7 << 0)
#define E4210_MUX_HPM_MASK (1 << 20)
#define E4210_DIV0_ATB_SHIFT 16
#define E4210_DIV0_ATB_MASK (DIV_MASK << E4210_DIV0_ATB_SHIFT)
#define MAX_DIV 8
#define DIV_MASK 7
#define DIV_MASK_ALL 0xffffffff
#define MUX_MASK 7
/*
* Helper function to wait until divider(s) have stabilized after the divider
* value has changed.
*/
static void wait_until_divider_stable(void __iomem *div_reg, unsigned long mask)
{
unsigned long timeout = jiffies + msecs_to_jiffies(10);
do {
if (!(readl(div_reg) & mask))
return;
} while (time_before(jiffies, timeout));
if (!(readl(div_reg) & mask))
return;
pr_err("%s: timeout in divider stablization\n", __func__);
}
/*
* Helper function to wait until mux has stabilized after the mux selection
* value was changed.
*/
static void wait_until_mux_stable(void __iomem *mux_reg, u32 mux_pos,
unsigned long mux_value)
{
unsigned long timeout = jiffies + msecs_to_jiffies(10);
do {
if (((readl(mux_reg) >> mux_pos) & MUX_MASK) == mux_value)
return;
} while (time_before(jiffies, timeout));
if (((readl(mux_reg) >> mux_pos) & MUX_MASK) == mux_value)
return;
pr_err("%s: re-parenting mux timed-out\n", __func__);
}
/* common round rate callback useable for all types of CPU clocks */
static long exynos_cpuclk_round_rate(struct clk_hw *hw,
unsigned long drate, unsigned long *prate)
{
struct clk *parent = __clk_get_parent(hw->clk);
*prate = __clk_round_rate(parent, drate);
return *prate;
}
/* common recalc rate callback useable for all types of CPU clocks */
static unsigned long exynos_cpuclk_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
/*
* The CPU clock output (armclk) rate is the same as its parent
* rate. Although there exist certain dividers inside the CPU
* clock block that could be used to divide the parent clock,
* the driver does not make use of them currently, except during
* frequency transitions.
*/
return parent_rate;
}
static const struct clk_ops exynos_cpuclk_clk_ops = {
.recalc_rate = exynos_cpuclk_recalc_rate,
.round_rate = exynos_cpuclk_round_rate,
};
/*
* Helper function to set the 'safe' dividers for the CPU clock. The parameters
* div and mask contain the divider value and the register bit mask of the
* dividers to be programmed.
*/
static void exynos_set_safe_div(void __iomem *base, unsigned long div,
unsigned long mask)
{
unsigned long div0;
div0 = readl(base + E4210_DIV_CPU0);
div0 = (div0 & ~mask) | (div & mask);
writel(div0, base + E4210_DIV_CPU0);
wait_until_divider_stable(base + E4210_DIV_STAT_CPU0, mask);
}
/* handler for pre-rate change notification from parent clock */
static int exynos_cpuclk_pre_rate_change(struct clk_notifier_data *ndata,
struct exynos_cpuclk *cpuclk, void __iomem *base)
{
const struct exynos_cpuclk_cfg_data *cfg_data = cpuclk->cfg;
unsigned long alt_prate = clk_get_rate(cpuclk->alt_parent);
unsigned long alt_div = 0, alt_div_mask = DIV_MASK;
unsigned long div0, div1 = 0, mux_reg;
/* find out the divider values to use for clock data */
while ((cfg_data->prate * 1000) != ndata->new_rate) {
if (cfg_data->prate == 0)
return -EINVAL;
cfg_data++;
}
spin_lock(cpuclk->lock);
/*
* For the selected PLL clock frequency, get the pre-defined divider
* values. If the clock for sclk_hpm is not sourced from apll, then
* the values for DIV_COPY and DIV_HPM dividers need not be set.
*/
div0 = cfg_data->div0;
if (test_bit(CLK_CPU_HAS_DIV1, &cpuclk->flags)) {
div1 = cfg_data->div1;
if (readl(base + E4210_SRC_CPU) & E4210_MUX_HPM_MASK)
div1 = readl(base + E4210_DIV_CPU1) &
(E4210_DIV1_HPM_MASK | E4210_DIV1_COPY_MASK);
}
/*
* If the old parent clock speed is less than the clock speed of
* the alternate parent, then it should be ensured that at no point
* the armclk speed is more than the old_prate until the dividers are
* set. Also workaround the issue of the dividers being set to lower
* values before the parent clock speed is set to new lower speed
* (this can result in too high speed of armclk output clocks).
*/
if (alt_prate > ndata->old_rate || ndata->old_rate > ndata->new_rate) {
unsigned long tmp_rate = min(ndata->old_rate, ndata->new_rate);
alt_div = DIV_ROUND_UP(alt_prate, tmp_rate) - 1;
WARN_ON(alt_div >= MAX_DIV);
if (test_bit(CLK_CPU_NEEDS_DEBUG_ALT_DIV, &cpuclk->flags)) {
/*
* In Exynos4210, ATB clock parent is also mout_core. So
* ATB clock also needs to be mantained at safe speed.
*/
alt_div |= E4210_DIV0_ATB_MASK;
alt_div_mask |= E4210_DIV0_ATB_MASK;
}
exynos_set_safe_div(base, alt_div, alt_div_mask);
div0 |= alt_div;
}
/* select sclk_mpll as the alternate parent */
mux_reg = readl(base + E4210_SRC_CPU);
writel(mux_reg | (1 << 16), base + E4210_SRC_CPU);
wait_until_mux_stable(base + E4210_STAT_CPU, 16, 2);
/* alternate parent is active now. set the dividers */
writel(div0, base + E4210_DIV_CPU0);
wait_until_divider_stable(base + E4210_DIV_STAT_CPU0, DIV_MASK_ALL);
if (test_bit(CLK_CPU_HAS_DIV1, &cpuclk->flags)) {
writel(div1, base + E4210_DIV_CPU1);
wait_until_divider_stable(base + E4210_DIV_STAT_CPU1,
DIV_MASK_ALL);
}
spin_unlock(cpuclk->lock);
return 0;
}
/* handler for post-rate change notification from parent clock */
static int exynos_cpuclk_post_rate_change(struct clk_notifier_data *ndata,
struct exynos_cpuclk *cpuclk, void __iomem *base)
{
const struct exynos_cpuclk_cfg_data *cfg_data = cpuclk->cfg;
unsigned long div = 0, div_mask = DIV_MASK;
unsigned long mux_reg;
/* find out the divider values to use for clock data */
if (test_bit(CLK_CPU_NEEDS_DEBUG_ALT_DIV, &cpuclk->flags)) {
while ((cfg_data->prate * 1000) != ndata->new_rate) {
if (cfg_data->prate == 0)
return -EINVAL;
cfg_data++;
}
}
spin_lock(cpuclk->lock);
/* select mout_apll as the alternate parent */
mux_reg = readl(base + E4210_SRC_CPU);
writel(mux_reg & ~(1 << 16), base + E4210_SRC_CPU);
wait_until_mux_stable(base + E4210_STAT_CPU, 16, 1);
if (test_bit(CLK_CPU_NEEDS_DEBUG_ALT_DIV, &cpuclk->flags)) {
div |= (cfg_data->div0 & E4210_DIV0_ATB_MASK);
div_mask |= E4210_DIV0_ATB_MASK;
}
exynos_set_safe_div(base, div, div_mask);
spin_unlock(cpuclk->lock);
return 0;
}
/*
* This notifier function is called for the pre-rate and post-rate change
* notifications of the parent clock of cpuclk.
*/
static int exynos_cpuclk_notifier_cb(struct notifier_block *nb,
unsigned long event, void *data)
{
struct clk_notifier_data *ndata = data;
struct exynos_cpuclk *cpuclk;
void __iomem *base;
int err = 0;
cpuclk = container_of(nb, struct exynos_cpuclk, clk_nb);
base = cpuclk->ctrl_base;
if (event == PRE_RATE_CHANGE)
err = exynos_cpuclk_pre_rate_change(ndata, cpuclk, base);
else if (event == POST_RATE_CHANGE)
err = exynos_cpuclk_post_rate_change(ndata, cpuclk, base);
return notifier_from_errno(err);
}
/* helper function to register a CPU clock */
int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx,
unsigned int lookup_id, const char *name, const char *parent,
const char *alt_parent, unsigned long offset,
const struct exynos_cpuclk_cfg_data *cfg,
unsigned long num_cfgs, unsigned long flags)
{
struct exynos_cpuclk *cpuclk;
struct clk_init_data init;
struct clk *clk;
int ret = 0;
cpuclk = kzalloc(sizeof(*cpuclk), GFP_KERNEL);
if (!cpuclk)
return -ENOMEM;
init.name = name;
init.flags = CLK_SET_RATE_PARENT;
init.parent_names = &parent;
init.num_parents = 1;
init.ops = &exynos_cpuclk_clk_ops;
cpuclk->hw.init = &init;
cpuclk->ctrl_base = ctx->reg_base + offset;
cpuclk->lock = &ctx->lock;
cpuclk->flags = flags;
cpuclk->clk_nb.notifier_call = exynos_cpuclk_notifier_cb;
cpuclk->alt_parent = __clk_lookup(alt_parent);
if (!cpuclk->alt_parent) {
pr_err("%s: could not lookup alternate parent %s\n",
__func__, alt_parent);
ret = -EINVAL;
goto free_cpuclk;
}
clk = __clk_lookup(parent);
if (!clk) {
pr_err("%s: could not lookup parent clock %s\n",
__func__, parent);
ret = -EINVAL;
goto free_cpuclk;
}
ret = clk_notifier_register(clk, &cpuclk->clk_nb);
if (ret) {
pr_err("%s: failed to register clock notifier for %s\n",
__func__, name);
goto free_cpuclk;
}
cpuclk->cfg = kmemdup(cfg, sizeof(*cfg) * num_cfgs, GFP_KERNEL);
if (!cpuclk->cfg) {
pr_err("%s: could not allocate memory for cpuclk data\n",
__func__);
ret = -ENOMEM;
goto unregister_clk_nb;
}
clk = clk_register(NULL, &cpuclk->hw);
if (IS_ERR(clk)) {
pr_err("%s: could not register cpuclk %s\n", __func__, name);
ret = PTR_ERR(clk);
goto free_cpuclk_data;
}
samsung_clk_add_lookup(ctx, clk, lookup_id);
return 0;
free_cpuclk_data:
kfree(cpuclk->cfg);
unregister_clk_nb:
clk_notifier_unregister(__clk_lookup(parent), &cpuclk->clk_nb);
free_cpuclk:
kfree(cpuclk);
return ret;
}

73
drivers/clk/samsung/clk-cpu.h 100644
View File

@ -0,0 +1,73 @@
/*
* Copyright (c) 2014 Samsung Electronics Co., Ltd.
*
* 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.
*
* Common Clock Framework support for all PLL's in Samsung platforms
*/
#ifndef __SAMSUNG_CLK_CPU_H
#define __SAMSUNG_CLK_CPU_H
#include "clk.h"
/**
* struct exynos_cpuclk_data: config data to setup cpu clocks.
* @prate: frequency of the primary parent clock (in KHz).
* @div0: value to be programmed in the div_cpu0 register.
* @div1: value to be programmed in the div_cpu1 register.
*
* This structure holds the divider configuration data for dividers in the CPU
* clock domain. The parent frequency at which these divider values are valid is
* specified in @prate. The @prate is the frequency of the primary parent clock.
* For CPU clock domains that do not have a DIV1 register, the @div1 member
* value is not used.
*/
struct exynos_cpuclk_cfg_data {
unsigned long prate;
unsigned long div0;
unsigned long div1;
};
/**
* struct exynos_cpuclk: information about clock supplied to a CPU core.
* @hw: handle between CCF and CPU clock.
* @alt_parent: alternate parent clock to use when switching the speed
* of the primary parent clock.
* @ctrl_base: base address of the clock controller.
* @lock: cpu clock domain register access lock.
* @cfg: cpu clock rate configuration data.
* @num_cfgs: number of array elements in @cfg array.
* @clk_nb: clock notifier registered for changes in clock speed of the
* primary parent clock.
* @flags: configuration flags for the CPU clock.
*
* This structure holds information required for programming the CPU clock for
* various clock speeds.
*/
struct exynos_cpuclk {
struct clk_hw hw;
struct clk *alt_parent;
void __iomem *ctrl_base;
spinlock_t *lock;
const struct exynos_cpuclk_cfg_data *cfg;
const unsigned long num_cfgs;
struct notifier_block clk_nb;
unsigned long flags;
/* The CPU clock registers has DIV1 configuration register */
#define CLK_CPU_HAS_DIV1 (1 << 0)
/* When ALT parent is active, debug clocks need safe divider values */
#define CLK_CPU_NEEDS_DEBUG_ALT_DIV (1 << 1)
};
extern int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx,
unsigned int lookup_id, const char *name,
const char *parent, const char *alt_parent,
unsigned long offset,
const struct exynos_cpuclk_cfg_data *cfg,
unsigned long num_cfgs, unsigned long flags);
#endif /* __SAMSUNG_CLK_CPU_H */

24
drivers/clk/samsung/clk-exynos4.c
View File

@ -19,6 +19,7 @@
#include <linux/syscore_ops.h>
#include "clk.h"
#include "clk-cpu.h"
/* Exynos4 clock controller register offsets */
#define SRC_LEFTBUS 0x4200
@ -534,7 +535,8 @@ static struct samsung_fixed_factor_clock exynos4x12_fixed_factor_clks[] __initda
/* list of mux clocks supported in all exynos4 soc's */
static struct samsung_mux_clock exynos4_mux_clks[] __initdata = {
MUX_FA(CLK_MOUT_APLL, "mout_apll", mout_apll_p, SRC_CPU, 0, 1,
CLK_SET_RATE_PARENT, 0, "mout_apll"),
CLK_SET_RATE_PARENT | CLK_RECALC_NEW_RATES, 0,
"mout_apll"),
MUX(CLK_MOUT_HDMI, "mout_hdmi", mout_hdmi_p, SRC_TV, 0, 1),
MUX(0, "mout_mfc1", sclk_evpll_p, SRC_MFC, 4, 1),
MUX(0, "mout_mfc", mout_mfc_p, SRC_MFC, 8, 1),
@ -1378,6 +1380,22 @@ static void __init exynos4x12_core_down_clock(void)
__raw_writel(0x0, reg_base + E4X12_PWR_CTRL2);
}
#define E4210_CPU_DIV0(apll, pclk_dbg, atb, periph, corem1, corem0) \
(((apll) << 24) | ((pclk_dbg) << 20) | ((atb) << 16) | \
((periph) << 12) | ((corem1) << 8) | ((corem0) << 4))
#define E4210_CPU_DIV1(hpm, copy) \
(((hpm) << 4) | ((copy) << 0))
static const struct exynos_cpuclk_cfg_data e4210_armclk_d[] __initconst = {
{ 1200000, E4210_CPU_DIV0(7, 1, 4, 3, 7, 3), E4210_CPU_DIV1(0, 5), },
{ 1000000, E4210_CPU_DIV0(7, 1, 4, 3, 7, 3), E4210_CPU_DIV1(0, 4), },
{ 800000, E4210_CPU_DIV0(7, 1, 3, 3, 7, 3), E4210_CPU_DIV1(0, 3), },
{ 500000, E4210_CPU_DIV0(7, 1, 3, 3, 7, 3), E4210_CPU_DIV1(0, 3), },
{ 400000, E4210_CPU_DIV0(7, 1, 3, 3, 7, 3), E4210_CPU_DIV1(0, 3), },
{ 200000, E4210_CPU_DIV0(0, 1, 1, 1, 3, 1), E4210_CPU_DIV1(0, 3), },
{ 0 },
};
/* register exynos4 clocks */
static void __init exynos4_clk_init(struct device_node *np,
enum exynos4_soc soc)
@ -1455,6 +1473,10 @@ static void __init exynos4_clk_init(struct device_node *np,
samsung_clk_register_fixed_factor(ctx,
exynos4210_fixed_factor_clks,
ARRAY_SIZE(exynos4210_fixed_factor_clks));
exynos_register_cpu_clock(ctx, CLK_ARM_CLK, "armclk",
mout_core_p4210[0], mout_core_p4210[1], 0x14200,
e4210_armclk_d, ARRAY_SIZE(e4210_armclk_d),
CLK_CPU_NEEDS_DEBUG_ALT_DIV | CLK_CPU_HAS_DIV1);
} else {
samsung_clk_register_mux(ctx, exynos4x12_mux_clks,
ARRAY_SIZE(exynos4x12_mux_clks));

11
drivers/cpufreq/Kconfig.arm
View File

@ -36,17 +36,6 @@ config ARM_EXYNOS_CPUFREQ
If in doubt, say N.
config ARM_EXYNOS4210_CPUFREQ
bool "SAMSUNG EXYNOS4210"
depends on CPU_EXYNOS4210
depends on ARM_EXYNOS_CPUFREQ
default y
help
This adds the CPUFreq driver for Samsung EXYNOS4210
SoC (S5PV310 or S5PC210).
If in doubt, say N.
config ARM_EXYNOS4X12_CPUFREQ
bool "SAMSUNG EXYNOS4x12"
depends on SOC_EXYNOS4212 || SOC_EXYNOS4412

1
drivers/cpufreq/Makefile
View File

@ -54,7 +54,6 @@ obj-$(CONFIG_ARCH_DAVINCI) += davinci-cpufreq.o
obj-$(CONFIG_UX500_SOC_DB8500) += dbx500-cpufreq.o
obj-$(CONFIG_ARM_EXYNOS_CPUFREQ) += arm-exynos-cpufreq.o
arm-exynos-cpufreq-y := exynos-cpufreq.o
arm-exynos-cpufreq-$(CONFIG_ARM_EXYNOS4210_CPUFREQ) += exynos4210-cpufreq.o
arm-exynos-cpufreq-$(CONFIG_ARM_EXYNOS4X12_CPUFREQ) += exynos4x12-cpufreq.o
arm-exynos-cpufreq-$(CONFIG_ARM_EXYNOS5250_CPUFREQ) += exynos5250-cpufreq.o
obj-$(CONFIG_ARM_EXYNOS5440_CPUFREQ) += exynos5440-cpufreq.o

5
drivers/cpufreq/exynos-cpufreq.c
View File

@ -168,10 +168,7 @@ static int exynos_cpufreq_probe(struct platform_device *pdev)
exynos_info->dev = &pdev->dev;
if (of_machine_is_compatible("samsung,exynos4210")) {
exynos_info->type = EXYNOS_SOC_4210;
ret = exynos4210_cpufreq_init(exynos_info);
} else if (of_machine_is_compatible("samsung,exynos4212")) {
if (of_machine_is_compatible("samsung,exynos4212")) {
exynos_info->type = EXYNOS_SOC_4212;
ret = exynos4x12_cpufreq_init(exynos_info);
} else if (of_machine_is_compatible("samsung,exynos4412")) {

9
drivers/cpufreq/exynos-cpufreq.h
View File

@ -18,7 +18,6 @@ enum cpufreq_level_index {
};
enum exynos_soc_type {
EXYNOS_SOC_4210,
EXYNOS_SOC_4212,
EXYNOS_SOC_4412,
EXYNOS_SOC_5250,
@ -53,14 +52,6 @@ struct exynos_dvfs_info {
void __iomem *cmu_regs;
};
#ifdef CONFIG_ARM_EXYNOS4210_CPUFREQ
extern int exynos4210_cpufreq_init(struct exynos_dvfs_info *);
#else
static inline int exynos4210_cpufreq_init(struct exynos_dvfs_info *info)
{
return -EOPNOTSUPP;
}
#endif
#ifdef CONFIG_ARM_EXYNOS4X12_CPUFREQ
extern int exynos4x12_cpufreq_init(struct exynos_dvfs_info *);
#else

184
drivers/cpufreq/exynos4210-cpufreq.c
View File

@ -1,184 +0,0 @@
/*
* Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* EXYNOS4210 - CPU frequency scaling support
*
* 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/module.h>
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/cpufreq.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include "exynos-cpufreq.h"
static struct clk *cpu_clk;
static struct clk *moutcore;
static struct clk *mout_mpll;
static struct clk *mout_apll;
static struct exynos_dvfs_info *cpufreq;
static unsigned int exynos4210_volt_table[] = {
1250000, 1150000, 1050000, 975000, 950000,
};
static struct cpufreq_frequency_table exynos4210_freq_table[] = {
{0, L0, 1200 * 1000},
{0, L1, 1000 * 1000},
{0, L2, 800 * 1000},
{0, L3, 500 * 1000},
{0, L4, 200 * 1000},
{0, 0, CPUFREQ_TABLE_END},
};
static struct apll_freq apll_freq_4210[] = {
/*
* values:
* freq
* clock divider for CORE, COREM0, COREM1, PERIPH, ATB, PCLK_DBG, APLL, RESERVED
* clock divider for COPY, HPM, RESERVED
* PLL M, P, S
*/
APLL_FREQ(1200, 0, 3, 7, 3, 4, 1, 7, 0, 5, 0, 0, 150, 3, 1),
APLL_FREQ(1000, 0, 3, 7, 3, 4, 1, 7, 0, 4, 0, 0, 250, 6, 1),
APLL_FREQ(800, 0, 3, 7, 3, 3, 1, 7, 0, 3, 0, 0, 200, 6, 1),
APLL_FREQ(500, 0, 3, 7, 3, 3, 1, 7, 0, 3, 0, 0, 250, 6, 2),
APLL_FREQ(200, 0, 1, 3, 1, 3, 1, 0, 0, 3, 0, 0, 200, 6, 3),
};
static void exynos4210_set_clkdiv(unsigned int div_index)
{
unsigned int tmp;
/* Change Divider - CPU0 */
tmp = apll_freq_4210[div_index].clk_div_cpu0;
__raw_writel(tmp, cpufreq->cmu_regs + EXYNOS4_CLKDIV_CPU);
do {
tmp = __raw_readl(cpufreq->cmu_regs + EXYNOS4_CLKDIV_STATCPU);
} while (tmp & 0x1111111);
/* Change Divider - CPU1 */
tmp = apll_freq_4210[div_index].clk_div_cpu1;
__raw_writel(tmp, cpufreq->cmu_regs + EXYNOS4_CLKDIV_CPU1);
do {
tmp = __raw_readl(cpufreq->cmu_regs + EXYNOS4_CLKDIV_STATCPU1);
} while (tmp & 0x11);
}
static void exynos4210_set_apll(unsigned int index)
{
unsigned int tmp, freq = apll_freq_4210[index].freq;
/* MUX_CORE_SEL = MPLL, ARMCLK uses MPLL for lock time */
clk_set_parent(moutcore, mout_mpll);
do {
tmp = (__raw_readl(cpufreq->cmu_regs + EXYNOS4_CLKMUX_STATCPU)
>> EXYNOS4_CLKSRC_CPU_MUXCORE_SHIFT);
tmp &= 0x7;
} while (tmp != 0x2);
clk_set_rate(mout_apll, freq * 1000);
/* MUX_CORE_SEL = APLL */
clk_set_parent(moutcore, mout_apll);
do {
tmp = __raw_readl(cpufreq->cmu_regs + EXYNOS4_CLKMUX_STATCPU);
tmp &= EXYNOS4_CLKMUX_STATCPU_MUXCORE_MASK;
} while (tmp != (0x1 << EXYNOS4_CLKSRC_CPU_MUXCORE_SHIFT));
}
static void exynos4210_set_frequency(unsigned int old_index,
unsigned int new_index)
{
if (old_index > new_index) {
exynos4210_set_clkdiv(new_index);
exynos4210_set_apll(new_index);
} else if (old_index < new_index) {
exynos4210_set_apll(new_index);
exynos4210_set_clkdiv(new_index);
}
}
int exynos4210_cpufreq_init(struct exynos_dvfs_info *info)
{
struct device_node *np;
unsigned long rate;
/*
* HACK: This is a temporary workaround to get access to clock
* controller registers directly and remove static mappings and
* dependencies on platform headers. It is necessary to enable
* Exynos multi-platform support and will be removed together with
* this whole driver as soon as Exynos gets migrated to use
* cpufreq-dt driver.
*/
np = of_find_compatible_node(NULL, NULL, "samsung,exynos4210-clock");
if (!np) {
pr_err("%s: failed to find clock controller DT node\n",
__func__);
return -ENODEV;
}
info->cmu_regs = of_iomap(np, 0);
if (!info->cmu_regs) {
pr_err("%s: failed to map CMU registers\n", __func__);
return -EFAULT;
}
cpu_clk = clk_get(NULL, "armclk");
if (IS_ERR(cpu_clk))
return PTR_ERR(cpu_clk);
moutcore = clk_get(NULL, "moutcore");
if (IS_ERR(moutcore))
goto err_moutcore;
mout_mpll = clk_get(NULL, "mout_mpll");
if (IS_ERR(mout_mpll))
goto err_mout_mpll;
rate = clk_get_rate(mout_mpll) / 1000;
mout_apll = clk_get(NULL, "mout_apll");
if (IS_ERR(mout_apll))
goto err_mout_apll;
info->mpll_freq_khz = rate;
/* 800Mhz */
info->pll_safe_idx = L2;
info->cpu_clk = cpu_clk;
info->volt_table = exynos4210_volt_table;
info->freq_table = exynos4210_freq_table;
info->set_freq = exynos4210_set_frequency;
cpufreq = info;
return 0;
err_mout_apll:
clk_put(mout_mpll);
err_mout_mpll:
clk_put(moutcore);
err_moutcore:
clk_put(cpu_clk);
pr_debug("%s: failed initialization\n", __func__);
return -EINVAL;
}

1
include/linux/clk-provider.h
View File

@ -31,6 +31,7 @@
#define CLK_GET_RATE_NOCACHE BIT(6) /* do not use the cached clk rate */
#define CLK_SET_RATE_NO_REPARENT BIT(7) /* don't re-parent on rate change */
#define CLK_GET_ACCURACY_NOCACHE BIT(8) /* do not use the cached clk accuracy */
#define CLK_RECALC_NEW_RATES BIT(9) /* recalc rates after notifications */
struct clk_hw;
struct clk_core;