1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
4 * Author(s): Vikas Manocha, <vikas.manocha@st.com> for STMicroelectronics.
13 #define MEM_MODE_MASK GENMASK(2, 0)
14 #define NOT_FOUND 0xff
16 struct stm32_fmc_regs {
18 u32 bcr1; /* NOR/PSRAM Chip select control register 1 */
19 u32 btr1; /* SRAM/NOR-Flash Chip select timing register 1 */
20 u32 bcr2; /* NOR/PSRAM Chip select Control register 2 */
21 u32 btr2; /* SRAM/NOR-Flash Chip select timing register 2 */
22 u32 bcr3; /* NOR/PSRAMChip select Control register 3 */
23 u32 btr3; /* SRAM/NOR-Flash Chip select timing register 3 */
24 u32 bcr4; /* NOR/PSRAM Chip select Control register 4 */
25 u32 btr4; /* SRAM/NOR-Flash Chip select timing register 4 */
29 u32 pcr; /* NAND Flash control register */
30 u32 sr; /* FIFO status and interrupt register */
31 u32 pmem; /* Common memory space timing register */
32 u32 patt; /* Attribute memory space timing registers */
34 u32 eccr; /* ECC result registers */
38 u32 bwtr1; /* SRAM/NOR-Flash write timing register 1 */
40 u32 bwtr2; /* SRAM/NOR-Flash write timing register 2 */
42 u32 bwtr3; /* SRAM/NOR-Flash write timing register 3 */
44 u32 bwtr4; /* SRAM/NOR-Flash write timing register 4 */
48 u32 sdcr1; /* SDRAM Control register 1 */
49 u32 sdcr2; /* SDRAM Control register 2 */
50 u32 sdtr1; /* SDRAM Timing register 1 */
51 u32 sdtr2; /* SDRAM Timing register 2 */
52 u32 sdcmr; /* SDRAM Mode register */
53 u32 sdrtr; /* SDRAM Refresh timing register */
54 u32 sdsr; /* SDRAM Status register */
58 * NOR/PSRAM Control register BCR1
59 * FMC controller Enable, only availabe for H7
61 #define FMC_BCR1_FMCEN BIT(31)
63 /* Control register SDCR */
64 #define FMC_SDCR_RPIPE_SHIFT 13 /* RPIPE bit shift */
65 #define FMC_SDCR_RBURST_SHIFT 12 /* RBURST bit shift */
66 #define FMC_SDCR_SDCLK_SHIFT 10 /* SDRAM clock divisor shift */
67 #define FMC_SDCR_WP_SHIFT 9 /* Write protection shift */
68 #define FMC_SDCR_CAS_SHIFT 7 /* CAS latency shift */
69 #define FMC_SDCR_NB_SHIFT 6 /* Number of banks shift */
70 #define FMC_SDCR_MWID_SHIFT 4 /* Memory width shift */
71 #define FMC_SDCR_NR_SHIFT 2 /* Number of row address bits shift */
72 #define FMC_SDCR_NC_SHIFT 0 /* Number of col address bits shift */
74 /* Timings register SDTR */
75 #define FMC_SDTR_TMRD_SHIFT 0 /* Load mode register to active */
76 #define FMC_SDTR_TXSR_SHIFT 4 /* Exit self-refresh time */
77 #define FMC_SDTR_TRAS_SHIFT 8 /* Self-refresh time */
78 #define FMC_SDTR_TRC_SHIFT 12 /* Row cycle delay */
79 #define FMC_SDTR_TWR_SHIFT 16 /* Recovery delay */
80 #define FMC_SDTR_TRP_SHIFT 20 /* Row precharge delay */
81 #define FMC_SDTR_TRCD_SHIFT 24 /* Row-to-column delay */
83 #define FMC_SDCMR_NRFS_SHIFT 5
85 #define FMC_SDCMR_MODE_NORMAL 0
86 #define FMC_SDCMR_MODE_START_CLOCK 1
87 #define FMC_SDCMR_MODE_PRECHARGE 2
88 #define FMC_SDCMR_MODE_AUTOREFRESH 3
89 #define FMC_SDCMR_MODE_WRITE_MODE 4
90 #define FMC_SDCMR_MODE_SELFREFRESH 5
91 #define FMC_SDCMR_MODE_POWERDOWN 6
93 #define FMC_SDCMR_BANK_1 BIT(4)
94 #define FMC_SDCMR_BANK_2 BIT(3)
96 #define FMC_SDCMR_MODE_REGISTER_SHIFT 9
98 #define FMC_SDSR_BUSY BIT(5)
100 #define FMC_BUSY_WAIT(regs) do { \
101 __asm__ __volatile__ ("dsb" : : : "memory"); \
102 while (regs->sdsr & FMC_SDSR_BUSY) \
106 struct stm32_sdram_control {
117 struct stm32_sdram_timing {
126 enum stm32_fmc_bank {
132 enum stm32_fmc_family {
138 struct stm32_sdram_control *sdram_control;
139 struct stm32_sdram_timing *sdram_timing;
141 enum stm32_fmc_bank target_bank;
144 struct stm32_sdram_params {
145 struct stm32_fmc_regs *base;
147 struct bank_params bank_params[MAX_SDRAM_BANK];
148 enum stm32_fmc_family family;
151 #define SDRAM_MODE_BL_SHIFT 0
152 #define SDRAM_MODE_CAS_SHIFT 4
153 #define SDRAM_MODE_BL 0
155 int stm32_sdram_init(struct udevice *dev)
157 struct stm32_sdram_params *params = dev_get_platdata(dev);
158 struct stm32_sdram_control *control;
159 struct stm32_sdram_timing *timing;
160 struct stm32_fmc_regs *regs = params->base;
161 enum stm32_fmc_bank target_bank;
162 u32 ctb; /* SDCMR register: Command Target Bank */
166 /* disable the FMC controller */
167 if (params->family == STM32H7_FMC)
168 clrbits_le32(®s->bcr1, FMC_BCR1_FMCEN);
170 for (i = 0; i < params->no_sdram_banks; i++) {
171 control = params->bank_params[i].sdram_control;
172 timing = params->bank_params[i].sdram_timing;
173 target_bank = params->bank_params[i].target_bank;
174 ref_count = params->bank_params[i].sdram_ref_count;
176 writel(control->sdclk << FMC_SDCR_SDCLK_SHIFT
177 | control->cas_latency << FMC_SDCR_CAS_SHIFT
178 | control->no_banks << FMC_SDCR_NB_SHIFT
179 | control->memory_width << FMC_SDCR_MWID_SHIFT
180 | control->no_rows << FMC_SDCR_NR_SHIFT
181 | control->no_columns << FMC_SDCR_NC_SHIFT
182 | control->rd_pipe_delay << FMC_SDCR_RPIPE_SHIFT
183 | control->rd_burst << FMC_SDCR_RBURST_SHIFT,
186 if (target_bank == SDRAM_BANK2)
187 writel(control->cas_latency << FMC_SDCR_CAS_SHIFT
188 | control->no_banks << FMC_SDCR_NB_SHIFT
189 | control->memory_width << FMC_SDCR_MWID_SHIFT
190 | control->no_rows << FMC_SDCR_NR_SHIFT
191 | control->no_columns << FMC_SDCR_NC_SHIFT,
194 writel(timing->trcd << FMC_SDTR_TRCD_SHIFT
195 | timing->trp << FMC_SDTR_TRP_SHIFT
196 | timing->twr << FMC_SDTR_TWR_SHIFT
197 | timing->trc << FMC_SDTR_TRC_SHIFT
198 | timing->tras << FMC_SDTR_TRAS_SHIFT
199 | timing->txsr << FMC_SDTR_TXSR_SHIFT
200 | timing->tmrd << FMC_SDTR_TMRD_SHIFT,
203 if (target_bank == SDRAM_BANK2)
204 writel(timing->trcd << FMC_SDTR_TRCD_SHIFT
205 | timing->trp << FMC_SDTR_TRP_SHIFT
206 | timing->twr << FMC_SDTR_TWR_SHIFT
207 | timing->trc << FMC_SDTR_TRC_SHIFT
208 | timing->tras << FMC_SDTR_TRAS_SHIFT
209 | timing->txsr << FMC_SDTR_TXSR_SHIFT
210 | timing->tmrd << FMC_SDTR_TMRD_SHIFT,
213 if (target_bank == SDRAM_BANK1)
214 ctb = FMC_SDCMR_BANK_1;
216 ctb = FMC_SDCMR_BANK_2;
218 writel(ctb | FMC_SDCMR_MODE_START_CLOCK, ®s->sdcmr);
219 udelay(200); /* 200 us delay, page 10, "Power-Up" */
222 writel(ctb | FMC_SDCMR_MODE_PRECHARGE, ®s->sdcmr);
226 writel((ctb | FMC_SDCMR_MODE_AUTOREFRESH | 7 << FMC_SDCMR_NRFS_SHIFT),
231 writel(ctb | (SDRAM_MODE_BL << SDRAM_MODE_BL_SHIFT
232 | control->cas_latency << SDRAM_MODE_CAS_SHIFT)
233 << FMC_SDCMR_MODE_REGISTER_SHIFT | FMC_SDCMR_MODE_WRITE_MODE,
238 writel(ctb | FMC_SDCMR_MODE_NORMAL, ®s->sdcmr);
242 writel(ref_count << 1, ®s->sdrtr);
245 /* enable the FMC controller */
246 if (params->family == STM32H7_FMC)
247 setbits_le32(®s->bcr1, FMC_BCR1_FMCEN);
252 static int stm32_fmc_ofdata_to_platdata(struct udevice *dev)
254 struct stm32_sdram_params *params = dev_get_platdata(dev);
255 struct bank_params *bank_params;
256 struct ofnode_phandle_args args;
264 mem_remap = dev_read_u32_default(dev, "st,mem_remap", NOT_FOUND);
265 if (mem_remap != NOT_FOUND) {
266 ret = dev_read_phandle_with_args(dev, "st,syscfg", NULL, 0, 0,
269 debug("%s: can't find syscon device (%d)\n", __func__,
274 syscfg_base = (u32 *)ofnode_get_addr(args.node);
276 /* set memory mapping selection */
277 clrsetbits_le32(syscfg_base, MEM_MODE_MASK, mem_remap);
279 debug("%s: cannot find st,mem_remap property\n", __func__);
282 dev_for_each_subnode(bank_node, dev) {
283 /* extract the bank index from DT */
284 bank_name = (char *)ofnode_get_name(bank_node);
285 strsep(&bank_name, "@");
287 pr_err("missing sdram bank index");
291 bank_params = ¶ms->bank_params[bank];
292 strict_strtoul(bank_name, 10,
293 (long unsigned int *)&bank_params->target_bank);
295 if (bank_params->target_bank >= MAX_SDRAM_BANK) {
296 pr_err("Found bank %d , but only bank 0 and 1 are supported",
297 bank_params->target_bank);
301 debug("Find bank %s %u\n", bank_name, bank_params->target_bank);
303 params->bank_params[bank].sdram_control =
304 (struct stm32_sdram_control *)
305 ofnode_read_u8_array_ptr(bank_node,
307 sizeof(struct stm32_sdram_control));
309 if (!params->bank_params[bank].sdram_control) {
310 pr_err("st,sdram-control not found for %s",
311 ofnode_get_name(bank_node));
316 params->bank_params[bank].sdram_timing =
317 (struct stm32_sdram_timing *)
318 ofnode_read_u8_array_ptr(bank_node,
320 sizeof(struct stm32_sdram_timing));
322 if (!params->bank_params[bank].sdram_timing) {
323 pr_err("st,sdram-timing not found for %s",
324 ofnode_get_name(bank_node));
329 bank_params->sdram_ref_count = ofnode_read_u32_default(bank_node,
330 "st,sdram-refcount", 8196);
334 params->no_sdram_banks = bank;
335 debug("%s, no of banks = %d\n", __func__, params->no_sdram_banks);
340 static int stm32_fmc_probe(struct udevice *dev)
342 struct stm32_sdram_params *params = dev_get_platdata(dev);
346 addr = dev_read_addr(dev);
347 if (addr == FDT_ADDR_T_NONE)
350 params->base = (struct stm32_fmc_regs *)addr;
351 params->family = dev_get_driver_data(dev);
356 ret = clk_get_by_index(dev, 0, &clk);
360 ret = clk_enable(&clk);
363 dev_err(dev, "failed to enable clock\n");
367 ret = stm32_sdram_init(dev);
374 static int stm32_fmc_get_info(struct udevice *dev, struct ram_info *info)
379 static struct ram_ops stm32_fmc_ops = {
380 .get_info = stm32_fmc_get_info,
383 static const struct udevice_id stm32_fmc_ids[] = {
384 { .compatible = "st,stm32-fmc", .data = STM32F7_FMC },
385 { .compatible = "st,stm32h7-fmc", .data = STM32H7_FMC },
389 U_BOOT_DRIVER(stm32_fmc) = {
392 .of_match = stm32_fmc_ids,
393 .ops = &stm32_fmc_ops,
394 .ofdata_to_platdata = stm32_fmc_ofdata_to_platdata,
395 .probe = stm32_fmc_probe,
396 .platdata_auto_alloc_size = sizeof(struct stm32_sdram_params),