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/*
* Renesas RCar Gen2 CPG MSSR driver
*
* Copyright (C) 2017 Marek Vasut <marek.vasut@gmail.com>
*
* Based on the following driver from Linux kernel:
* r8a7796 Clock Pulse Generator / Module Standby and Software Reset
*
* Copyright (C) 2016 Glider bvba
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <clk-uclass.h>
#include <dm.h>
#include <errno.h>
#include <asm/io.h>
#include <dt-bindings/clock/renesas-cpg-mssr.h>
#include "renesas-cpg-mssr.h"
#include "rcar-gen2-cpg.h"
#define CPG_RST_MODEMR 0x0060
#define CPG_PLL0CR 0x00d8
#define CPG_SDCKCR 0x0074
struct clk_div_table {
u8 val;
u8 div;
};
/* SDHI divisors */
static const struct clk_div_table cpg_sdh_div_table[] = {
{ 0, 2 }, { 1, 3 }, { 2, 4 }, { 3, 6 },
{ 4, 8 }, { 5, 12 }, { 6, 16 }, { 7, 18 },
{ 8, 24 }, { 10, 36 }, { 11, 48 }, { 0, 0 },
};
static const struct clk_div_table cpg_sd01_div_table[] = {
{ 4, 8 }, { 5, 12 }, { 6, 16 }, { 7, 18 },
{ 8, 24 }, { 10, 36 }, { 11, 48 }, { 12, 10 },
{ 0, 0 },
};
static u8 gen2_clk_get_sdh_div(const struct clk_div_table *table, u8 div)
{
while ((*table++).val) {
if ((*table).div == div)
return div;
}
return 0xff;
}
static int gen2_clk_enable(struct clk *clk)
{
struct gen2_clk_priv *priv = dev_get_priv(clk->dev);
return renesas_clk_endisable(clk, priv->base, true);
}
static int gen2_clk_disable(struct clk *clk)
{
struct gen2_clk_priv *priv = dev_get_priv(clk->dev);
return renesas_clk_endisable(clk, priv->base, false);
}
static ulong gen2_clk_get_rate(struct clk *clk)
{
struct gen2_clk_priv *priv = dev_get_priv(clk->dev);
struct cpg_mssr_info *info = priv->info;
struct clk parent;
const struct cpg_core_clk *core;
const struct rcar_gen2_cpg_pll_config *pll_config =
priv->cpg_pll_config;
u32 value, mult, div, rate = 0;
int ret;
debug("%s[%i] Clock: id=%lu\n", __func__, __LINE__, clk->id);
ret = renesas_clk_get_parent(clk, info, &parent);
if (ret) {
printf("%s[%i] parent fail, ret=%i\n", __func__, __LINE__, ret);
return ret;
}
if (renesas_clk_is_mod(clk)) {
rate = gen2_clk_get_rate(&parent);
debug("%s[%i] MOD clk: parent=%lu => rate=%u\n",
__func__, __LINE__, parent.id, rate);
return rate;
}
ret = renesas_clk_get_core(clk, info, &core);
if (ret)
return ret;
switch (core->type) {
case CLK_TYPE_IN:
if (core->id == info->clk_extal_id) {
rate = clk_get_rate(&priv->clk_extal);
debug("%s[%i] EXTAL clk: rate=%u\n",
__func__, __LINE__, rate);
return rate;
}
if (core->id == info->clk_extal_usb_id) {
rate = clk_get_rate(&priv->clk_extal_usb);
debug("%s[%i] EXTALR clk: rate=%u\n",
__func__, __LINE__, rate);
return rate;
}
return -EINVAL;
case CLK_TYPE_FF:
rate = (gen2_clk_get_rate(&parent) * core->mult) / core->div;
debug("%s[%i] FIXED clk: parent=%i div=%i mul=%i => rate=%u\n",
__func__, __LINE__,
core->parent, core->mult, core->div, rate);
return rate;
case CLK_TYPE_DIV6P1: /* DIV6 Clock with 1 parent clock */
value = (readl(priv->base + core->offset) & 0x3f) + 1;
rate = gen2_clk_get_rate(&parent) / value;
debug("%s[%i] DIV6P1 clk: parent=%i div=%i => rate=%u\n",
__func__, __LINE__,
core->parent, value, rate);
return rate;
case CLK_TYPE_GEN2_MAIN:
rate = gen2_clk_get_rate(&parent) / pll_config->extal_div;
debug("%s[%i] MAIN clk: parent=%i extal_div=%i => rate=%u\n",
__func__, __LINE__,
core->parent, pll_config->extal_div, rate);
return rate;
case CLK_TYPE_GEN2_PLL0:
/*
* PLL0 is a configurable multiplier clock except on R-Car
* V2H/E2. Register the PLL0 clock 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.
*/
mult = pll_config->pll0_mult;
if (!mult) {
value = readl(priv->base + CPG_PLL0CR);
mult = (((value >> 24) & 0x7f) + 1) * 2;
}
rate = (gen2_clk_get_rate(&parent) * mult) / info->pll0_div;
debug("%s[%i] PLL0 clk: parent=%i mult=%u => rate=%u\n",
__func__, __LINE__, core->parent, mult, rate);
return rate;
case CLK_TYPE_GEN2_PLL1:
rate = (gen2_clk_get_rate(&parent) * pll_config->pll1_mult) / 2;
debug("%s[%i] PLL1 clk: parent=%i mul=%i => rate=%u\n",
__func__, __LINE__,
core->parent, pll_config->pll1_mult, rate);
return rate;
case CLK_TYPE_GEN2_PLL3:
rate = gen2_clk_get_rate(&parent) * pll_config->pll3_mult;
debug("%s[%i] PLL3 clk: parent=%i mul=%i => rate=%u\n",
__func__, __LINE__,
core->parent, pll_config->pll3_mult, rate);
return rate;
case CLK_TYPE_GEN2_SDH:
value = (readl(priv->base + CPG_SDCKCR) >> 8) & 0xf;
div = gen2_clk_get_sdh_div(cpg_sdh_div_table, value);
rate = gen2_clk_get_rate(&parent) / div;
debug("%s[%i] SDH clk: parent=%i div=%i => rate=%u\n",
__func__, __LINE__,
core->parent, div, rate);
return rate;
case CLK_TYPE_GEN2_SD0:
value = (readl(priv->base + CPG_SDCKCR) >> 4) & 0xf;
div = gen2_clk_get_sdh_div(cpg_sd01_div_table, value);
rate = gen2_clk_get_rate(&parent) / div;
debug("%s[%i] SD0 clk: parent=%i div=%i => rate=%u\n",
__func__, __LINE__,
core->parent, div, rate);
return rate;
case CLK_TYPE_GEN2_SD1:
value = (readl(priv->base + CPG_SDCKCR) >> 0) & 0xf;
div = gen2_clk_get_sdh_div(cpg_sd01_div_table, value);
rate = gen2_clk_get_rate(&parent) / div;
debug("%s[%i] SD1 clk: parent=%i div=%i => rate=%u\n",
__func__, __LINE__,
core->parent, div, rate);
return rate;
}
printf("%s[%i] unknown fail\n", __func__, __LINE__);
return -ENOENT;
}
static ulong gen2_clk_set_rate(struct clk *clk, ulong rate)
{
return gen2_clk_get_rate(clk);
}
static int gen2_clk_of_xlate(struct clk *clk, struct ofnode_phandle_args *args)
{
if (args->args_count != 2) {
debug("Invaild args_count: %d\n", args->args_count);
return -EINVAL;
}
clk->id = (args->args[0] << 16) | args->args[1];
return 0;
}
const struct clk_ops gen2_clk_ops = {
.enable = gen2_clk_enable,
.disable = gen2_clk_disable,
.get_rate = gen2_clk_get_rate,
.set_rate = gen2_clk_set_rate,
.of_xlate = gen2_clk_of_xlate,
};
int gen2_clk_probe(struct udevice *dev)
{
struct gen2_clk_priv *priv = dev_get_priv(dev);
struct cpg_mssr_info *info =
(struct cpg_mssr_info *)dev_get_driver_data(dev);
fdt_addr_t rst_base;
u32 cpg_mode;
int ret;
priv->base = (struct gen2_base *)devfdt_get_addr(dev);
if (!priv->base)
return -EINVAL;
priv->info = info;
ret = fdt_node_offset_by_compatible(gd->fdt_blob, -1, info->reset_node);
if (ret < 0)
return ret;
rst_base = fdtdec_get_addr(gd->fdt_blob, ret, "reg");
if (rst_base == FDT_ADDR_T_NONE)
return -EINVAL;
cpg_mode = readl(rst_base + CPG_RST_MODEMR);
priv->cpg_pll_config =
(struct rcar_gen2_cpg_pll_config *)info->get_pll_config(cpg_mode);
if (!priv->cpg_pll_config->extal_div)
return -EINVAL;
ret = clk_get_by_name(dev, "extal", &priv->clk_extal);
if (ret < 0)
return ret;
if (info->extal_usb_node) {
ret = clk_get_by_name(dev, info->extal_usb_node,
&priv->clk_extal_usb);
if (ret < 0)
return ret;
}
return 0;
}
int gen2_clk_remove(struct udevice *dev)
{
struct gen2_clk_priv *priv = dev_get_priv(dev);
return renesas_clk_remove(priv->base, priv->info);
}
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