blob: 49b1262461be323d6f40fa61e4f27f321cb3de0c [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
/*
* Copyright (C) 2018, STMicroelectronics - All Rights Reserved
*/
#define LOG_CATEGORY UCLASS_RAM
#include <common.h>
#include <clk.h>
#include <dm.h>
#include <init.h>
#include <log.h>
#include <ram.h>
#include <regmap.h>
#include <syscon.h>
#include <asm/io.h>
#include <dm/device_compat.h>
#include "stm32mp1_ddr.h"
#include "stm32mp1_ddr_regs.h"
/* DDR subsystem configuration */
struct stm32mp1_ddr_cfg {
u8 nb_bytes; /* MEMC_DRAM_DATA_WIDTH */
};
static const char *const clkname[] = {
"ddrc1",
"ddrc2",
"ddrcapb",
"ddrphycapb",
"ddrphyc" /* LAST clock => used for get_rate() */
};
int stm32mp1_ddr_clk_enable(struct ddr_info *priv, uint32_t mem_speed)
{
unsigned long ddrphy_clk;
unsigned long ddr_clk;
struct clk clk;
int ret;
unsigned int idx;
for (idx = 0; idx < ARRAY_SIZE(clkname); idx++) {
ret = clk_get_by_name(priv->dev, clkname[idx], &clk);
if (!ret)
ret = clk_enable(&clk);
if (ret) {
log_err("error for %s : %d\n", clkname[idx], ret);
return ret;
}
}
priv->clk = clk;
ddrphy_clk = clk_get_rate(&priv->clk);
log_debug("DDR: mem_speed (%d kHz), RCC %d kHz\n",
mem_speed, (u32)(ddrphy_clk / 1000));
/* max 10% frequency delta */
ddr_clk = abs(ddrphy_clk - mem_speed * 1000);
if (ddr_clk > (mem_speed * 100)) {
log_err("DDR expected freq %d kHz, current is %d kHz\n",
mem_speed, (u32)(ddrphy_clk / 1000));
return -EINVAL;
}
return 0;
}
__weak int board_stm32mp1_ddr_config_name_match(struct udevice *dev,
const char *name)
{
return 0; /* Always match */
}
static ofnode stm32mp1_ddr_get_ofnode(struct udevice *dev)
{
const char *name;
ofnode node;
dev_for_each_subnode(node, dev) {
name = ofnode_get_property(node, "compatible", NULL);
if (!board_stm32mp1_ddr_config_name_match(dev, name))
return node;
}
return dev_ofnode(dev);
}
static int stm32mp1_ddr_setup(struct udevice *dev)
{
struct ddr_info *priv = dev_get_priv(dev);
int ret;
unsigned int idx;
struct clk axidcg;
struct stm32mp1_ddr_config config;
ofnode node = stm32mp1_ddr_get_ofnode(dev);
#define PARAM(x, y, z) \
{ .name = x, \
.offset = offsetof(struct stm32mp1_ddr_config, y), \
.size = sizeof(config.y) / sizeof(u32), \
}
#define CTL_PARAM(x) PARAM("st,ctl-"#x, c_##x, NULL)
#define PHY_PARAM(x) PARAM("st,phy-"#x, p_##x, NULL)
const struct {
const char *name; /* name in DT */
const u32 offset; /* offset in config struct */
const u32 size; /* size of parameters */
} param[] = {
CTL_PARAM(reg),
CTL_PARAM(timing),
CTL_PARAM(map),
CTL_PARAM(perf),
PHY_PARAM(reg),
PHY_PARAM(timing)
};
config.info.speed = ofnode_read_u32_default(node, "st,mem-speed", 0);
config.info.size = ofnode_read_u32_default(node, "st,mem-size", 0);
config.info.name = ofnode_read_string(node, "st,mem-name");
if (!config.info.name) {
dev_dbg(dev, "no st,mem-name\n");
return -EINVAL;
}
printf("RAM: %s\n", config.info.name);
for (idx = 0; idx < ARRAY_SIZE(param); idx++) {
ret = ofnode_read_u32_array(node, param[idx].name,
(void *)((u32)&config +
param[idx].offset),
param[idx].size);
dev_dbg(dev, "%s: %s[0x%x] = %d\n", __func__,
param[idx].name, param[idx].size, ret);
if (ret) {
dev_err(dev, "Cannot read %s, error=%d\n",
param[idx].name, ret);
return -EINVAL;
}
}
ret = clk_get_by_name(dev, "axidcg", &axidcg);
if (ret) {
dev_dbg(dev, "%s: Cannot found axidcg\n", __func__);
return -EINVAL;
}
clk_disable(&axidcg); /* disable clock gating during init */
stm32mp1_ddr_init(priv, &config);
clk_enable(&axidcg); /* enable clock gating */
/* check size */
dev_dbg(dev, "get_ram_size(%x, %x)\n",
(u32)priv->info.base, (u32)STM32_DDR_SIZE);
priv->info.size = get_ram_size((long *)priv->info.base,
STM32_DDR_SIZE);
dev_dbg(dev, "info.size: %x\n", (u32)priv->info.size);
/* check memory access for all memory */
if (config.info.size != priv->info.size) {
printf("DDR invalid size : 0x%x, expected 0x%x\n",
priv->info.size, config.info.size);
return -EINVAL;
}
return 0;
}
static u8 get_data_bus_width(struct stm32mp1_ddrctl *ctl)
{
u32 reg = readl(&ctl->mstr) & DDRCTRL_MSTR_DATA_BUS_WIDTH_MASK;
u8 data_bus_width = reg >> DDRCTRL_MSTR_DATA_BUS_WIDTH_SHIFT;
return data_bus_width;
}
static u8 get_nb_bank(struct stm32mp1_ddrctl *ctl)
{
/* Count bank address bits */
u8 bits = 0;
u32 reg, val;
reg = readl(&ctl->addrmap1);
/* addrmap1.addrmap_bank_b1 */
val = (reg & GENMASK(5, 0)) >> 0;
if (val <= 31)
bits++;
/* addrmap1.addrmap_bank_b2 */
val = (reg & GENMASK(13, 8)) >> 8;
if (val <= 31)
bits++;
/* addrmap1.addrmap_bank_b3 */
val = (reg & GENMASK(21, 16)) >> 16;
if (val <= 31)
bits++;
return bits;
}
static u8 get_nb_col(struct stm32mp1_ddrctl *ctl, u8 data_bus_width)
{
u8 bits;
u32 reg, val;
/* Count column address bits, start at 2 for b0 and b1 (fixed) */
bits = 2;
reg = readl(&ctl->addrmap2);
/* addrmap2.addrmap_col_b2 */
val = (reg & GENMASK(3, 0)) >> 0;
if (val <= 7)
bits++;
/* addrmap2.addrmap_col_b3 */
val = (reg & GENMASK(11, 8)) >> 8;
if (val <= 7)
bits++;
/* addrmap2.addrmap_col_b4 */
val = (reg & GENMASK(19, 16)) >> 16;
if (val <= 7)
bits++;
/* addrmap2.addrmap_col_b5 */
val = (reg & GENMASK(27, 24)) >> 24;
if (val <= 7)
bits++;
reg = readl(&ctl->addrmap3);
/* addrmap3.addrmap_col_b6 */
val = (reg & GENMASK(3, 0)) >> 0;
if (val <= 7)
bits++;
/* addrmap3.addrmap_col_b7 */
val = (reg & GENMASK(11, 8)) >> 8;
if (val <= 7)
bits++;
/* addrmap3.addrmap_col_b8 */
val = (reg & GENMASK(19, 16)) >> 16;
if (val <= 7)
bits++;
/* addrmap3.addrmap_col_b9 */
val = (reg & GENMASK(27, 24)) >> 24;
if (val <= 7)
bits++;
reg = readl(&ctl->addrmap4);
/* addrmap4.addrmap_col_b10 */
val = (reg & GENMASK(3, 0)) >> 0;
if (val <= 7)
bits++;
/* addrmap4.addrmap_col_b11 */
val = (reg & GENMASK(11, 8)) >> 8;
if (val <= 7)
bits++;
/*
* column bits shift up:
* 1 when half the data bus is used (data_bus_width = 1)
* 2 when a quarter the data bus is used (data_bus_width = 2)
* nothing to do for full data bus (data_bus_width = 0)
*/
bits += data_bus_width;
return bits;
}
static u8 get_nb_row(struct stm32mp1_ddrctl *ctl)
{
/* Count row address bits */
u8 bits = 0;
u32 reg, val;
reg = readl(&ctl->addrmap5);
/* addrmap5.addrmap_row_b0 */
val = (reg & GENMASK(3, 0)) >> 0;
if (val <= 11)
bits++;
/* addrmap5.addrmap_row_b1 */
val = (reg & GENMASK(11, 8)) >> 8;
if (val <= 11)
bits++;
/* addrmap5.addrmap_row_b2_10 */
val = (reg & GENMASK(19, 16)) >> 16;
if (val <= 11)
bits += 9;
else
printf("warning: addrmap5.addrmap_row_b2_10 not supported\n");
/* addrmap5.addrmap_row_b11 */
val = (reg & GENMASK(27, 24)) >> 24;
if (val <= 11)
bits++;
reg = readl(&ctl->addrmap6);
/* addrmap6.addrmap_row_b12 */
val = (reg & GENMASK(3, 0)) >> 0;
if (val <= 7)
bits++;
/* addrmap6.addrmap_row_b13 */
val = (reg & GENMASK(11, 8)) >> 8;
if (val <= 7)
bits++;
/* addrmap6.addrmap_row_b14 */
val = (reg & GENMASK(19, 16)) >> 16;
if (val <= 7)
bits++;
/* addrmap6.addrmap_row_b15 */
val = (reg & GENMASK(27, 24)) >> 24;
if (val <= 7)
bits++;
return bits;
}
/*
* stm32mp1_ddr_size
*
* Get the current DRAM size from the DDR CTL registers
*
* @return: DRAM size
*/
u32 stm32mp1_ddr_size(struct udevice *dev)
{
u8 nb_bit;
u32 ddr_size;
u8 data_bus_width;
struct ddr_info *priv = dev_get_priv(dev);
struct stm32mp1_ddrctl *ctl = priv->ctl;
struct stm32mp1_ddr_cfg *cfg = (struct stm32mp1_ddr_cfg *)dev_get_driver_data(dev);
const u8 nb_bytes = cfg->nb_bytes;
data_bus_width = get_data_bus_width(ctl);
nb_bit = get_nb_bank(ctl) + get_nb_col(ctl, data_bus_width) +
get_nb_row(ctl);
if (nb_bit > 32) {
nb_bit = 32;
debug("invalid DDR configuration: %d bits\n", nb_bit);
}
ddr_size = (nb_bytes >> data_bus_width) << nb_bit;
if (ddr_size > STM32_DDR_SIZE) {
ddr_size = STM32_DDR_SIZE;
debug("invalid DDR configuration: size = %x\n", ddr_size);
}
return ddr_size;
}
static int stm32mp1_ddr_probe(struct udevice *dev)
{
struct ddr_info *priv = dev_get_priv(dev);
struct regmap *map;
int ret;
priv->dev = dev;
ret = regmap_init_mem(dev_ofnode(dev), &map);
if (ret)
return log_ret(ret);
priv->ctl = regmap_get_range(map, 0);
priv->phy = regmap_get_range(map, 1);
priv->rcc = STM32_RCC_BASE;
priv->info.base = STM32_DDR_BASE;
if (IS_ENABLED(CONFIG_SPL_BUILD)) {
priv->info.size = 0;
ret = stm32mp1_ddr_setup(dev);
return log_ret(ret);
}
priv->info.size = stm32mp1_ddr_size(dev);
return 0;
}
static int stm32mp1_ddr_get_info(struct udevice *dev, struct ram_info *info)
{
struct ddr_info *priv = dev_get_priv(dev);
*info = priv->info;
return 0;
}
static struct ram_ops stm32mp1_ddr_ops = {
.get_info = stm32mp1_ddr_get_info,
};
static const struct stm32mp1_ddr_cfg stm32mp15x_ddr_cfg = {
.nb_bytes = 4,
};
static const struct udevice_id stm32mp1_ddr_ids[] = {
{ .compatible = "st,stm32mp1-ddr", .data = (ulong)&stm32mp15x_ddr_cfg},
{ }
};
U_BOOT_DRIVER(ddr_stm32mp1) = {
.name = "stm32mp1_ddr",
.id = UCLASS_RAM,
.of_match = stm32mp1_ddr_ids,
.ops = &stm32mp1_ddr_ops,
.probe = stm32mp1_ddr_probe,
.priv_auto = sizeof(struct ddr_info),
};