1 // SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
3 * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
14 #include "stm32mp1_ddr.h"
16 static const char *const clkname[] = {
21 "ddrphyc" /* LAST clock => used for get_rate() */
24 int stm32mp1_ddr_clk_enable(struct ddr_info *priv, uint32_t mem_speed)
26 unsigned long ddrphy_clk;
27 unsigned long ddr_clk;
32 for (idx = 0; idx < ARRAY_SIZE(clkname); idx++) {
33 ret = clk_get_by_name(priv->dev, clkname[idx], &clk);
36 ret = clk_enable(&clk);
39 printf("error for %s : %d\n", clkname[idx], ret);
45 ddrphy_clk = clk_get_rate(&priv->clk);
47 debug("DDR: mem_speed (%d kHz), RCC %d kHz\n",
48 mem_speed, (u32)(ddrphy_clk / 1000));
49 /* max 10% frequency delta */
50 ddr_clk = abs(ddrphy_clk - mem_speed * 1000);
51 if (ddr_clk > (mem_speed * 100)) {
52 pr_err("DDR expected freq %d kHz, current is %d kHz\n",
53 mem_speed, (u32)(ddrphy_clk / 1000));
60 static __maybe_unused int stm32mp1_ddr_setup(struct udevice *dev)
62 struct ddr_info *priv = dev_get_priv(dev);
66 struct stm32mp1_ddr_config config;
68 #define PARAM(x, y, z) \
70 .offset = offsetof(struct stm32mp1_ddr_config, y), \
71 .size = sizeof(config.y) / sizeof(u32), \
75 #define CTL_PARAM(x) PARAM("st,ctl-"#x, c_##x, NULL)
76 #define PHY_PARAM(x) PARAM("st,phy-"#x, p_##x, NULL)
77 #define PHY_PARAM_OPT(x) PARAM("st,phy-"#x, p_##x, &config.p_##x##_present)
80 const char *name; /* name in DT */
81 const u32 offset; /* offset in config struct */
82 const u32 size; /* size of parameters */
83 bool * const present; /* presence indication for opt */
94 config.info.speed = dev_read_u32_default(dev, "st,mem-speed", 0);
95 config.info.size = dev_read_u32_default(dev, "st,mem-size", 0);
96 config.info.name = dev_read_string(dev, "st,mem-name");
97 if (!config.info.name) {
98 debug("%s: no st,mem-name\n", __func__);
101 printf("RAM: %s\n", config.info.name);
103 for (idx = 0; idx < ARRAY_SIZE(param); idx++) {
104 ret = dev_read_u32_array(dev, param[idx].name,
105 (void *)((u32)&config +
108 debug("%s: %s[0x%x] = %d\n", __func__,
109 param[idx].name, param[idx].size, ret);
111 (ret != -FDT_ERR_NOTFOUND || !param[idx].present)) {
112 pr_err("%s: Cannot read %s, error=%d\n",
113 __func__, param[idx].name, ret);
116 if (param[idx].present) {
117 /* save presence of optional parameters */
118 *param[idx].present = true;
119 if (ret == -FDT_ERR_NOTFOUND) {
120 *param[idx].present = false;
121 #ifdef CONFIG_STM32MP1_DDR_INTERACTIVE
122 /* reset values if used later */
123 memset((void *)((u32)&config +
125 0, param[idx].size * sizeof(u32));
131 ret = clk_get_by_name(dev, "axidcg", &axidcg);
133 debug("%s: Cannot found axidcg\n", __func__);
136 clk_disable(&axidcg); /* disable clock gating during init */
138 stm32mp1_ddr_init(priv, &config);
140 clk_enable(&axidcg); /* enable clock gating */
143 debug("%s : get_ram_size(%x, %x)\n", __func__,
144 (u32)priv->info.base, (u32)STM32_DDR_SIZE);
146 priv->info.size = get_ram_size((long *)priv->info.base,
149 debug("%s : %x\n", __func__, (u32)priv->info.size);
151 /* check memory access for all memory */
152 if (config.info.size != priv->info.size) {
153 printf("DDR invalid size : 0x%x, expected 0x%x\n",
154 priv->info.size, config.info.size);
160 static int stm32mp1_ddr_probe(struct udevice *dev)
162 struct ddr_info *priv = dev_get_priv(dev);
166 debug("STM32MP1 DDR probe\n");
169 ret = regmap_init_mem(dev_ofnode(dev), &map);
173 priv->ctl = regmap_get_range(map, 0);
174 priv->phy = regmap_get_range(map, 1);
176 priv->rcc = STM32_RCC_BASE;
178 priv->info.base = STM32_DDR_BASE;
180 #if !defined(CONFIG_TFABOOT) && \
181 (!defined(CONFIG_SPL) || defined(CONFIG_SPL_BUILD))
183 return stm32mp1_ddr_setup(dev);
185 priv->info.size = dev_read_u32_default(dev, "st,mem-size", 0);
190 static int stm32mp1_ddr_get_info(struct udevice *dev, struct ram_info *info)
192 struct ddr_info *priv = dev_get_priv(dev);
199 static struct ram_ops stm32mp1_ddr_ops = {
200 .get_info = stm32mp1_ddr_get_info,
203 static const struct udevice_id stm32mp1_ddr_ids[] = {
204 { .compatible = "st,stm32mp1-ddr" },
208 U_BOOT_DRIVER(ddr_stm32mp1) = {
209 .name = "stm32mp1_ddr",
211 .of_match = stm32mp1_ddr_ids,
212 .ops = &stm32mp1_ddr_ops,
213 .probe = stm32mp1_ddr_probe,
214 .priv_auto_alloc_size = sizeof(struct ddr_info),