Release 4.11 drivers/clk/renesas/rcar-gen3-cpg.c
/*
* R-Car Gen3 Clock Pulse Generator
*
* Copyright (C) 2015-2016 Glider bvba
*
* Based on clk-rcar-gen3.c
*
* Copyright (C) 2015 Renesas Electronics Corp.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*/
#include <linux/bug.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/slab.h>
#include "renesas-cpg-mssr.h"
#include "rcar-gen3-cpg.h"
#define CPG_PLL0CR 0x00d8
#define CPG_PLL2CR 0x002c
#define CPG_PLL4CR 0x01f4
/*
* SDn Clock
*/
#define CPG_SD_STP_HCK BIT(9)
#define CPG_SD_STP_CK BIT(8)
#define CPG_SD_STP_MASK (CPG_SD_STP_HCK | CPG_SD_STP_CK)
#define CPG_SD_FC_MASK (0x7 << 2 | 0x3 << 0)
#define CPG_SD_DIV_TABLE_DATA(stp_hck, stp_ck, sd_srcfc, sd_fc, sd_div) \
{ \
.val = ((stp_hck) ? CPG_SD_STP_HCK : 0) | \
((stp_ck) ? CPG_SD_STP_CK : 0) | \
((sd_srcfc) << 2) | \
((sd_fc) << 0), \
.div = (sd_div), \
}
struct sd_div_table {
u32 val;
unsigned int div;
};
struct sd_clock {
struct clk_hw hw;
void __iomem *reg;
const struct sd_div_table *div_table;
unsigned int div_num;
unsigned int div_min;
unsigned int div_max;
};
/* SDn divider
* sd_srcfc sd_fc div
* stp_hck stp_ck (div) (div) = sd_srcfc x sd_fc
*-------------------------------------------------------------------
* 0 0 0 (1) 1 (4) 4
* 0 0 1 (2) 1 (4) 8
* 1 0 2 (4) 1 (4) 16
* 1 0 3 (8) 1 (4) 32
* 1 0 4 (16) 1 (4) 64
* 0 0 0 (1) 0 (2) 2
* 0 0 1 (2) 0 (2) 4
* 1 0 2 (4) 0 (2) 8
* 1 0 3 (8) 0 (2) 16
* 1 0 4 (16) 0 (2) 32
*/
static const struct sd_div_table cpg_sd_div_table[] = {
/* CPG_SD_DIV_TABLE_DATA(stp_hck, stp_ck, sd_srcfc, sd_fc, sd_div) */
CPG_SD_DIV_TABLE_DATA(0, 0, 0, 1, 4),
CPG_SD_DIV_TABLE_DATA(0, 0, 1, 1, 8),
CPG_SD_DIV_TABLE_DATA(1, 0, 2, 1, 16),
CPG_SD_DIV_TABLE_DATA(1, 0, 3, 1, 32),
CPG_SD_DIV_TABLE_DATA(1, 0, 4, 1, 64),
CPG_SD_DIV_TABLE_DATA(0, 0, 0, 0, 2),
CPG_SD_DIV_TABLE_DATA(0, 0, 1, 0, 4),
CPG_SD_DIV_TABLE_DATA(1, 0, 2, 0, 8),
CPG_SD_DIV_TABLE_DATA(1, 0, 3, 0, 16),
CPG_SD_DIV_TABLE_DATA(1, 0, 4, 0, 32),
};
#define to_sd_clock(_hw) container_of(_hw, struct sd_clock, hw)
static int cpg_sd_clock_enable(struct clk_hw *hw)
{
struct sd_clock *clock = to_sd_clock(hw);
u32 val, sd_fc;
unsigned int i;
val = readl(clock->reg);
sd_fc = val & CPG_SD_FC_MASK;
for (i = 0; i < clock->div_num; i++)
if (sd_fc == (clock->div_table[i].val & CPG_SD_FC_MASK))
break;
if (i >= clock->div_num)
return -EINVAL;
val &= ~(CPG_SD_STP_MASK);
val |= clock->div_table[i].val & CPG_SD_STP_MASK;
writel(val, clock->reg);
return 0;
}
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static void cpg_sd_clock_disable(struct clk_hw *hw)
{
struct sd_clock *clock = to_sd_clock(hw);
writel(readl(clock->reg) | CPG_SD_STP_MASK, clock->reg);
}
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static int cpg_sd_clock_is_enabled(struct clk_hw *hw)
{
struct sd_clock *clock = to_sd_clock(hw);
return !(readl(clock->reg) & CPG_SD_STP_MASK);
}
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static unsigned long cpg_sd_clock_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct sd_clock *clock = to_sd_clock(hw);
unsigned long rate = parent_rate;
u32 val, sd_fc;
unsigned int i;
val = readl(clock->reg);
sd_fc = val & CPG_SD_FC_MASK;
for (i = 0; i < clock->div_num; i++)
if (sd_fc == (clock->div_table[i].val & CPG_SD_FC_MASK))
break;
if (i >= clock->div_num)
return -EINVAL;
return DIV_ROUND_CLOSEST(rate, clock->div_table[i].div);
}
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static unsigned int cpg_sd_clock_calc_div(struct sd_clock *clock,
unsigned long rate,
unsigned long parent_rate)
{
unsigned int div;
if (!rate)
rate = 1;
div = DIV_ROUND_CLOSEST(parent_rate, rate);
return clamp_t(unsigned int, div, clock->div_min, clock->div_max);
}
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static long cpg_sd_clock_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *parent_rate)
{
struct sd_clock *clock = to_sd_clock(hw);
unsigned int div = cpg_sd_clock_calc_div(clock, rate, *parent_rate);
return DIV_ROUND_CLOSEST(*parent_rate, div);
}
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static int cpg_sd_clock_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct sd_clock *clock = to_sd_clock(hw);
unsigned int div = cpg_sd_clock_calc_div(clock, rate, parent_rate);
u32 val;
unsigned int i;
for (i = 0; i < clock->div_num; i++)
if (div == clock->div_table[i].div)
break;
if (i >= clock->div_num)
return -EINVAL;
val = readl(clock->reg);
val &= ~(CPG_SD_STP_MASK | CPG_SD_FC_MASK);
val |= clock->div_table[i].val & (CPG_SD_STP_MASK | CPG_SD_FC_MASK);
writel(val, clock->reg);
return 0;
}
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static const struct clk_ops cpg_sd_clock_ops = {
.enable = cpg_sd_clock_enable,
.disable = cpg_sd_clock_disable,
.is_enabled = cpg_sd_clock_is_enabled,
.recalc_rate = cpg_sd_clock_recalc_rate,
.round_rate = cpg_sd_clock_round_rate,
.set_rate = cpg_sd_clock_set_rate,
};
static struct clk * __init cpg_sd_clk_register(const struct cpg_core_clk *core,
void __iomem *base,
const char *parent_name)
{
struct clk_init_data init;
struct sd_clock *clock;
struct clk *clk;
unsigned int i;
clock = kzalloc(sizeof(*clock), GFP_KERNEL);
if (!clock)
return ERR_PTR(-ENOMEM);
init.name = core->name;
init.ops = &cpg_sd_clock_ops;
init.flags = CLK_IS_BASIC | CLK_SET_RATE_PARENT;
init.parent_names = &parent_name;
init.num_parents = 1;
clock->reg = base + core->offset;
clock->hw.init = &init;
clock->div_table = cpg_sd_div_table;
clock->div_num = ARRAY_SIZE(cpg_sd_div_table);
clock->div_max = clock->div_table[0].div;
clock->div_min = clock->div_max;
for (i = 1; i < clock->div_num; i++) {
clock->div_max = max(clock->div_max, clock->div_table[i].div);
clock->div_min = min(clock->div_min, clock->div_table[i].div);
}
clk = clk_register(NULL, &clock->hw);
if (IS_ERR(clk))
kfree(clock);
return clk;
}
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static const struct rcar_gen3_cpg_pll_config *cpg_pll_config __initdata;
static unsigned int cpg_clk_extalr __initdata;
struct clk * __init rcar_gen3_cpg_clk_register(struct device *dev,
const struct cpg_core_clk *core, const struct cpg_mssr_info *info,
struct clk **clks, void __iomem *base)
{
const struct clk *parent;
unsigned int mult = 1;
unsigned int div = 1;
u32 value;
parent = clks[core->parent];
if (IS_ERR(parent))
return ERR_CAST(parent);
switch (core->type) {
case CLK_TYPE_GEN3_MAIN:
div = cpg_pll_config->extal_div;
break;
case CLK_TYPE_GEN3_PLL0:
/*
* PLL0 is a configurable multiplier clock. Register it as a
* fixed factor clock for now as there's no generic multiplier
* clock implementation and we currently have no need to change
* the multiplier value.
*/
value = readl(base + CPG_PLL0CR);
mult = (((value >> 24) & 0x7f) + 1) * 2;
break;
case CLK_TYPE_GEN3_PLL1:
mult = cpg_pll_config->pll1_mult;
break;
case CLK_TYPE_GEN3_PLL2:
/*
* PLL2 is a configurable multiplier clock. Register it as a
* fixed factor clock for now as there's no generic multiplier
* clock implementation and we currently have no need to change
* the multiplier value.
*/
value = readl(base + CPG_PLL2CR);
mult = (((value >> 24) & 0x7f) + 1) * 2;
break;
case CLK_TYPE_GEN3_PLL3:
mult = cpg_pll_config->pll3_mult;
break;
case CLK_TYPE_GEN3_PLL4:
/*
* PLL4 is a configurable multiplier clock. Register it as a
* fixed factor clock for now as there's no generic multiplier
* clock implementation and we currently have no need to change
* the multiplier value.
*/
value = readl(base + CPG_PLL4CR);
mult = (((value >> 24) & 0x7f) + 1) * 2;
break;
case CLK_TYPE_GEN3_SD:
return cpg_sd_clk_register(core, base, __clk_get_name(parent));
case CLK_TYPE_GEN3_R:
/*
* RINT is default.
* Only if EXTALR is populated, we switch to it.
*/
value = readl(base + CPG_RCKCR) & 0x3f;
if (clk_get_rate(clks[cpg_clk_extalr])) {
parent = clks[cpg_clk_extalr];
value |= BIT(15);
}
writel(value, base + CPG_RCKCR);
break;
default:
return ERR_PTR(-EINVAL);
}
return clk_register_fixed_factor(NULL, core->name,
__clk_get_name(parent), 0, mult, div);
}
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int __init rcar_gen3_cpg_init(const struct rcar_gen3_cpg_pll_config *config,
unsigned int clk_extalr)
{
cpg_pll_config = config;
cpg_clk_extalr = clk_extalr;
return 0;
}
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