[J-u-boot.git] / drivers / ram / stm32_sdram.c

/*
 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
 * Author(s): Vikas Manocha, <[email protected]> for STMicroelectronics.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <clk.h>
#include <dm.h>
#include <ram.h>
#include <asm/io.h>

#define MEM_MODE_MASK	GENMASK(2, 0)
#define NOT_FOUND	0xff

struct stm32_fmc_regs {
	/* 0x0 */
	u32 bcr1;	/* NOR/PSRAM Chip select control register 1 */
	u32 btr1;	/* SRAM/NOR-Flash Chip select timing register 1 */
	u32 bcr2;	/* NOR/PSRAM Chip select Control register 2 */
	u32 btr2;	/* SRAM/NOR-Flash Chip select timing register 2 */
	u32 bcr3;	/* NOR/PSRAMChip select Control register 3 */
	u32 btr3;	/* SRAM/NOR-Flash Chip select timing register 3 */
	u32 bcr4;	/* NOR/PSRAM Chip select Control register 4 */
	u32 btr4;	/* SRAM/NOR-Flash Chip select timing register 4 */
	u32 reserved1[24];

	/* 0x80 */
	u32 pcr;	/* NAND Flash control register */
	u32 sr;		/* FIFO status and interrupt register */
	u32 pmem;	/* Common memory space timing register */
	u32 patt;	/* Attribute memory space timing registers  */
	u32 reserved2[1];
	u32 eccr;	/* ECC result registers */
	u32 reserved3[27];

	/* 0x104 */
	u32 bwtr1;	/* SRAM/NOR-Flash write timing register 1 */
	u32 reserved4[1];
	u32 bwtr2;	/* SRAM/NOR-Flash write timing register 2 */
	u32 reserved5[1];
	u32 bwtr3;	/* SRAM/NOR-Flash write timing register 3 */
	u32 reserved6[1];
	u32 bwtr4;	/* SRAM/NOR-Flash write timing register 4 */
	u32 reserved7[8];

	/* 0x140 */
	u32 sdcr1;	/* SDRAM Control register 1 */
	u32 sdcr2;	/* SDRAM Control register 2 */
	u32 sdtr1;	/* SDRAM Timing register 1 */
	u32 sdtr2;	/* SDRAM Timing register 2 */
	u32 sdcmr;	/* SDRAM Mode register */
	u32 sdrtr;	/* SDRAM Refresh timing register */
	u32 sdsr;	/* SDRAM Status register */
};

/*
 * NOR/PSRAM Control register BCR1
 * FMC controller Enable, only availabe for H7
 */
#define FMC_BCR1_FMCEN		BIT(31)

/* Control register SDCR */
#define FMC_SDCR_RPIPE_SHIFT	13	/* RPIPE bit shift */
#define FMC_SDCR_RBURST_SHIFT	12	/* RBURST bit shift */
#define FMC_SDCR_SDCLK_SHIFT	10	/* SDRAM clock divisor shift */
#define FMC_SDCR_WP_SHIFT	9	/* Write protection shift */
#define FMC_SDCR_CAS_SHIFT	7	/* CAS latency shift */
#define FMC_SDCR_NB_SHIFT	6	/* Number of banks shift */
#define FMC_SDCR_MWID_SHIFT	4	/* Memory width shift */
#define FMC_SDCR_NR_SHIFT	2	/* Number of row address bits shift */
#define FMC_SDCR_NC_SHIFT	0	/* Number of col address bits shift */

/* Timings register SDTR */
#define FMC_SDTR_TMRD_SHIFT	0	/* Load mode register to active */
#define FMC_SDTR_TXSR_SHIFT	4	/* Exit self-refresh time */
#define FMC_SDTR_TRAS_SHIFT	8	/* Self-refresh time */
#define FMC_SDTR_TRC_SHIFT	12	/* Row cycle delay */
#define FMC_SDTR_TWR_SHIFT	16	/* Recovery delay */
#define FMC_SDTR_TRP_SHIFT	20	/* Row precharge delay */
#define FMC_SDTR_TRCD_SHIFT	24	/* Row-to-column delay */

#define FMC_SDCMR_NRFS_SHIFT	5

#define FMC_SDCMR_MODE_NORMAL		0
#define FMC_SDCMR_MODE_START_CLOCK	1
#define FMC_SDCMR_MODE_PRECHARGE	2
#define FMC_SDCMR_MODE_AUTOREFRESH	3
#define FMC_SDCMR_MODE_WRITE_MODE	4
#define FMC_SDCMR_MODE_SELFREFRESH	5
#define FMC_SDCMR_MODE_POWERDOWN	6

#define FMC_SDCMR_BANK_1		BIT(4)
#define FMC_SDCMR_BANK_2		BIT(3)

#define FMC_SDCMR_MODE_REGISTER_SHIFT	9

#define FMC_SDSR_BUSY			BIT(5)

#define FMC_BUSY_WAIT(regs)	do { \
		__asm__ __volatile__ ("dsb" : : : "memory"); \
		while (regs->sdsr & FMC_SDSR_BUSY) \
			; \
	} while (0)

struct stm32_sdram_control {
	u8 no_columns;
	u8 no_rows;
	u8 memory_width;
	u8 no_banks;
	u8 cas_latency;
	u8 sdclk;
	u8 rd_burst;
	u8 rd_pipe_delay;
};

struct stm32_sdram_timing {
	u8 tmrd;
	u8 txsr;
	u8 tras;
	u8 trc;
	u8 trp;
	u8 twr;
	u8 trcd;
};
enum stm32_fmc_bank {
	SDRAM_BANK1,
	SDRAM_BANK2,
	MAX_SDRAM_BANK,
};

enum stm32_fmc_family {
	STM32F7_FMC,
	STM32H7_FMC,
};

struct bank_params {
	struct stm32_sdram_control *sdram_control;
	struct stm32_sdram_timing *sdram_timing;
	u32 sdram_ref_count;
	enum stm32_fmc_bank target_bank;
};

struct stm32_sdram_params {
	struct stm32_fmc_regs *base;
	u8 no_sdram_banks;
	struct bank_params bank_params[MAX_SDRAM_BANK];
	enum stm32_fmc_family family;
};

#define SDRAM_MODE_BL_SHIFT	0
#define SDRAM_MODE_CAS_SHIFT	4
#define SDRAM_MODE_BL		0

int stm32_sdram_init(struct udevice *dev)
{
	struct stm32_sdram_params *params = dev_get_platdata(dev);
	struct stm32_sdram_control *control;
	struct stm32_sdram_timing *timing;
	struct stm32_fmc_regs *regs = params->base;
	enum stm32_fmc_bank target_bank;
	u32 ctb; /* SDCMR register: Command Target Bank */
	u32 ref_count;
	u8 i;

	/* disable the FMC controller */
	if (params->family == STM32H7_FMC)
		clrbits_le32(&regs->bcr1, FMC_BCR1_FMCEN);

	for (i = 0; i < params->no_sdram_banks; i++) {
		control = params->bank_params[i].sdram_control;
		timing = params->bank_params[i].sdram_timing;
		target_bank = params->bank_params[i].target_bank;
		ref_count = params->bank_params[i].sdram_ref_count;

		writel(control->sdclk << FMC_SDCR_SDCLK_SHIFT
			| control->cas_latency << FMC_SDCR_CAS_SHIFT
			| control->no_banks << FMC_SDCR_NB_SHIFT
			| control->memory_width << FMC_SDCR_MWID_SHIFT
			| control->no_rows << FMC_SDCR_NR_SHIFT
			| control->no_columns << FMC_SDCR_NC_SHIFT
			| control->rd_pipe_delay << FMC_SDCR_RPIPE_SHIFT
			| control->rd_burst << FMC_SDCR_RBURST_SHIFT,
			&regs->sdcr1);

		if (target_bank == SDRAM_BANK2)
			writel(control->cas_latency << FMC_SDCR_CAS_SHIFT
				| control->no_banks << FMC_SDCR_NB_SHIFT
				| control->memory_width << FMC_SDCR_MWID_SHIFT
				| control->no_rows << FMC_SDCR_NR_SHIFT
				| control->no_columns << FMC_SDCR_NC_SHIFT,
				&regs->sdcr2);

		writel(timing->trcd << FMC_SDTR_TRCD_SHIFT
			| timing->trp << FMC_SDTR_TRP_SHIFT
			| timing->twr << FMC_SDTR_TWR_SHIFT
			| timing->trc << FMC_SDTR_TRC_SHIFT
			| timing->tras << FMC_SDTR_TRAS_SHIFT
			| timing->txsr << FMC_SDTR_TXSR_SHIFT
			| timing->tmrd << FMC_SDTR_TMRD_SHIFT,
			&regs->sdtr1);

		if (target_bank == SDRAM_BANK2)
			writel(timing->trcd << FMC_SDTR_TRCD_SHIFT
				| timing->trp << FMC_SDTR_TRP_SHIFT
				| timing->twr << FMC_SDTR_TWR_SHIFT
				| timing->trc << FMC_SDTR_TRC_SHIFT
				| timing->tras << FMC_SDTR_TRAS_SHIFT
				| timing->txsr << FMC_SDTR_TXSR_SHIFT
				| timing->tmrd << FMC_SDTR_TMRD_SHIFT,
				&regs->sdtr2);

		if (target_bank == SDRAM_BANK1)
			ctb = FMC_SDCMR_BANK_1;
		else
			ctb = FMC_SDCMR_BANK_2;

		writel(ctb | FMC_SDCMR_MODE_START_CLOCK, &regs->sdcmr);
		udelay(200);	/* 200 us delay, page 10, "Power-Up" */
		FMC_BUSY_WAIT(regs);

		writel(ctb | FMC_SDCMR_MODE_PRECHARGE, &regs->sdcmr);
		udelay(100);
		FMC_BUSY_WAIT(regs);

		writel((ctb | FMC_SDCMR_MODE_AUTOREFRESH | 7 << FMC_SDCMR_NRFS_SHIFT),
		       &regs->sdcmr);
		udelay(100);
		FMC_BUSY_WAIT(regs);

		writel(ctb | (SDRAM_MODE_BL << SDRAM_MODE_BL_SHIFT
		       | control->cas_latency << SDRAM_MODE_CAS_SHIFT)
		       << FMC_SDCMR_MODE_REGISTER_SHIFT | FMC_SDCMR_MODE_WRITE_MODE,
		       &regs->sdcmr);
		udelay(100);
		FMC_BUSY_WAIT(regs);

		writel(ctb | FMC_SDCMR_MODE_NORMAL, &regs->sdcmr);
		FMC_BUSY_WAIT(regs);

		/* Refresh timer */
		writel(ref_count << 1, &regs->sdrtr);
	}

	/* enable the FMC controller */
	if (params->family == STM32H7_FMC)
		setbits_le32(&regs->bcr1, FMC_BCR1_FMCEN);

	return 0;
}

static int stm32_fmc_ofdata_to_platdata(struct udevice *dev)
{
	struct stm32_sdram_params *params = dev_get_platdata(dev);
	struct bank_params *bank_params;
	struct ofnode_phandle_args args;
	u32 *syscfg_base;
	u32 mem_remap;
	ofnode bank_node;
	char *bank_name;
	u8 bank = 0;
	int ret;

	mem_remap = dev_read_u32_default(dev, "st,mem_remap", NOT_FOUND);
	if (mem_remap != NOT_FOUND) {
		ret = dev_read_phandle_with_args(dev, "st,syscfg", NULL, 0, 0,
						 &args);
		if (ret) {
			debug("%s: can't find syscon device (%d)\n", __func__,
			      ret);
			return ret;
		}

		syscfg_base = (u32 *)ofnode_get_addr(args.node);

		/* set memory mapping selection */
		clrsetbits_le32(syscfg_base, MEM_MODE_MASK, mem_remap);
	} else {
		debug("%s: cannot find st,mem_remap property\n", __func__);
	}

	dev_for_each_subnode(bank_node, dev) {
		/* extract the bank index from DT */
		bank_name = (char *)ofnode_get_name(bank_node);
		strsep(&bank_name, "@");
		if (!bank_name) {
			pr_err("missing sdram bank index");
			return -EINVAL;
		}

		bank_params = &params->bank_params[bank];
		strict_strtoul(bank_name, 10,
			       (long unsigned int *)&bank_params->target_bank);

		if (bank_params->target_bank >= MAX_SDRAM_BANK) {
			pr_err("Found bank %d , but only bank 0 and 1 are supported",
			      bank_params->target_bank);
			return -EINVAL;
		}

		debug("Find bank %s %u\n", bank_name, bank_params->target_bank);

		params->bank_params[bank].sdram_control =
			(struct stm32_sdram_control *)
			 ofnode_read_u8_array_ptr(bank_node,
						  "st,sdram-control",
						  sizeof(struct stm32_sdram_control));

		if (!params->bank_params[bank].sdram_control) {
			pr_err("st,sdram-control not found for %s",
			      ofnode_get_name(bank_node));
			return -EINVAL;
		}


		params->bank_params[bank].sdram_timing =
			(struct stm32_sdram_timing *)
			 ofnode_read_u8_array_ptr(bank_node,
						  "st,sdram-timing",
						  sizeof(struct stm32_sdram_timing));

		if (!params->bank_params[bank].sdram_timing) {
			pr_err("st,sdram-timing not found for %s",
			      ofnode_get_name(bank_node));
			return -EINVAL;
		}


		bank_params->sdram_ref_count = ofnode_read_u32_default(bank_node,
						"st,sdram-refcount", 8196);
		bank++;
	}

	params->no_sdram_banks = bank;
	debug("%s, no of banks = %d\n", __func__, params->no_sdram_banks);

	return 0;
}

static int stm32_fmc_probe(struct udevice *dev)
{
	struct stm32_sdram_params *params = dev_get_platdata(dev);
	int ret;
	fdt_addr_t addr;

	addr = dev_read_addr(dev);
	if (addr == FDT_ADDR_T_NONE)
		return -EINVAL;

	params->base = (struct stm32_fmc_regs *)addr;
	params->family = dev_get_driver_data(dev);

#ifdef CONFIG_CLK
	struct clk clk;

	ret = clk_get_by_index(dev, 0, &clk);
	if (ret < 0)
		return ret;

	ret = clk_enable(&clk);

	if (ret) {
		dev_err(dev, "failed to enable clock\n");
		return ret;
	}
#endif
	ret = stm32_sdram_init(dev);
	if (ret)
		return ret;

	return 0;
}

static int stm32_fmc_get_info(struct udevice *dev, struct ram_info *info)
{
	return 0;
}

static struct ram_ops stm32_fmc_ops = {
	.get_info = stm32_fmc_get_info,
};

static const struct udevice_id stm32_fmc_ids[] = {
	{ .compatible = "st,stm32-fmc", .data = STM32F7_FMC },
	{ .compatible = "st,stm32h7-fmc", .data = STM32H7_FMC },
	{ }
};

U_BOOT_DRIVER(stm32_fmc) = {
	.name = "stm32_fmc",
	.id = UCLASS_RAM,
	.of_match = stm32_fmc_ids,
	.ops = &stm32_fmc_ops,
	.ofdata_to_platdata = stm32_fmc_ofdata_to_platdata,
	.probe = stm32_fmc_probe,
	.platdata_auto_alloc_size = sizeof(struct stm32_sdram_params),
};
Commit	Line	Data
bf1ae442	1	/*
3bc599c9 PC	2	* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
3bc599c9 PC	3	* Author(s): Vikas Manocha, <[email protected]> for STMicroelectronics.
bf1ae442 VM	4	*
	5	* SPDX-License-Identifier: GPL-2.0+
	6	*/
	7
	8	#include <common.h>
d0b24c1a	9	#include <clk.h>
910a52ed VM	10	#include <dm.h>
910a52ed VM	11	#include <ram.h>
bf1ae442	12	#include <asm/io.h>
bf1ae442	13
0b3f789a PC	14	#define MEM_MODE_MASK GENMASK(2, 0)
	15	#define NOT_FOUND 0xff
	16
9242ece1	17	struct stm32_fmc_regs {
1421e0a3 PC	18	/* 0x0 */
	19	u32 bcr1; /* NOR/PSRAM Chip select control register 1 */
	20	u32 btr1; /* SRAM/NOR-Flash Chip select timing register 1 */
	21	u32 bcr2; /* NOR/PSRAM Chip select Control register 2 */
	22	u32 btr2; /* SRAM/NOR-Flash Chip select timing register 2 */
	23	u32 bcr3; /* NOR/PSRAMChip select Control register 3 */
	24	u32 btr3; /* SRAM/NOR-Flash Chip select timing register 3 */
	25	u32 bcr4; /* NOR/PSRAM Chip select Control register 4 */
	26	u32 btr4; /* SRAM/NOR-Flash Chip select timing register 4 */
	27	u32 reserved1[24];
	28
	29	/* 0x80 */
	30	u32 pcr; /* NAND Flash control register */
	31	u32 sr; /* FIFO status and interrupt register */
	32	u32 pmem; /* Common memory space timing register */
	33	u32 patt; /* Attribute memory space timing registers */
	34	u32 reserved2[1];
	35	u32 eccr; /* ECC result registers */
	36	u32 reserved3[27];
	37
	38	/* 0x104 */
	39	u32 bwtr1; /* SRAM/NOR-Flash write timing register 1 */
	40	u32 reserved4[1];
	41	u32 bwtr2; /* SRAM/NOR-Flash write timing register 2 */
	42	u32 reserved5[1];
	43	u32 bwtr3; /* SRAM/NOR-Flash write timing register 3 */
	44	u32 reserved6[1];
	45	u32 bwtr4; /* SRAM/NOR-Flash write timing register 4 */
	46	u32 reserved7[8];
	47
	48	/* 0x140 */
	49	u32 sdcr1; /* SDRAM Control register 1 */
	50	u32 sdcr2; /* SDRAM Control register 2 */
	51	u32 sdtr1; /* SDRAM Timing register 1 */
	52	u32 sdtr2; /* SDRAM Timing register 2 */
	53	u32 sdcmr; /* SDRAM Mode register */
	54	u32 sdrtr; /* SDRAM Refresh timing register */
	55	u32 sdsr; /* SDRAM Status register */
9242ece1 PC	56	};
9242ece1 PC	57
7016651e PC	58	/*
	59	* NOR/PSRAM Control register BCR1
	60	* FMC controller Enable, only availabe for H7
	61	*/
	62	#define FMC_BCR1_FMCEN BIT(31)
	63
9242ece1 PC	64	/* Control register SDCR */
	65	#define FMC_SDCR_RPIPE_SHIFT 13 /* RPIPE bit shift */
	66	#define FMC_SDCR_RBURST_SHIFT 12 /* RBURST bit shift */
	67	#define FMC_SDCR_SDCLK_SHIFT 10 /* SDRAM clock divisor shift */
	68	#define FMC_SDCR_WP_SHIFT 9 /* Write protection shift */
	69	#define FMC_SDCR_CAS_SHIFT 7 /* CAS latency shift */
	70	#define FMC_SDCR_NB_SHIFT 6 /* Number of banks shift */
	71	#define FMC_SDCR_MWID_SHIFT 4 /* Memory width shift */
	72	#define FMC_SDCR_NR_SHIFT 2 /* Number of row address bits shift */
	73	#define FMC_SDCR_NC_SHIFT 0 /* Number of col address bits shift */
	74
	75	/* Timings register SDTR */
	76	#define FMC_SDTR_TMRD_SHIFT 0 /* Load mode register to active */
	77	#define FMC_SDTR_TXSR_SHIFT 4 /* Exit self-refresh time */
	78	#define FMC_SDTR_TRAS_SHIFT 8 /* Self-refresh time */
	79	#define FMC_SDTR_TRC_SHIFT 12 /* Row cycle delay */
	80	#define FMC_SDTR_TWR_SHIFT 16 /* Recovery delay */
	81	#define FMC_SDTR_TRP_SHIFT 20 /* Row precharge delay */
	82	#define FMC_SDTR_TRCD_SHIFT 24 /* Row-to-column delay */
	83
	84	#define FMC_SDCMR_NRFS_SHIFT 5
	85
	86	#define FMC_SDCMR_MODE_NORMAL 0
	87	#define FMC_SDCMR_MODE_START_CLOCK 1
	88	#define FMC_SDCMR_MODE_PRECHARGE 2
	89	#define FMC_SDCMR_MODE_AUTOREFRESH 3
	90	#define FMC_SDCMR_MODE_WRITE_MODE 4
	91	#define FMC_SDCMR_MODE_SELFREFRESH 5
	92	#define FMC_SDCMR_MODE_POWERDOWN 6
	93
	94	#define FMC_SDCMR_BANK_1 BIT(4)
	95	#define FMC_SDCMR_BANK_2 BIT(3)
	96
	97	#define FMC_SDCMR_MODE_REGISTER_SHIFT 9
	98
	99	#define FMC_SDSR_BUSY BIT(5)
	100
1421e0a3	101	#define FMC_BUSY_WAIT(regs) do { \
9242ece1	102	__asm__ __volatile__ ("dsb" : : : "memory"); \
1421e0a3	103	while (regs->sdsr & FMC_SDSR_BUSY) \
9242ece1 PC	104	; \
	105	} while (0)
	106
6c9a1003 VM	107	struct stm32_sdram_control {
	108	u8 no_columns;
	109	u8 no_rows;
	110	u8 memory_width;
	111	u8 no_banks;
	112	u8 cas_latency;
bfea69ad	113	u8 sdclk;
6c9a1003 VM	114	u8 rd_burst;
	115	u8 rd_pipe_delay;
	116	};
	117
	118	struct stm32_sdram_timing {
	119	u8 tmrd;
	120	u8 txsr;
	121	u8 tras;
	122	u8 trc;
	123	u8 trp;
bfea69ad	124	u8 twr;
6c9a1003 VM	125	u8 trcd;
6c9a1003 VM	126	};
f303aaf2 PC	127	enum stm32_fmc_bank {
	128	SDRAM_BANK1,
	129	SDRAM_BANK2,
	130	MAX_SDRAM_BANK,
	131	};
	132
7016651e PC	133	enum stm32_fmc_family {
	134	STM32F7_FMC,
	135	STM32H7_FMC,
	136	};
	137
f303aaf2	138	struct bank_params {
f39b90dc PC	139	struct stm32_sdram_control *sdram_control;
f39b90dc PC	140	struct stm32_sdram_timing *sdram_timing;
bfea69ad	141	u32 sdram_ref_count;
f303aaf2 PC	142	enum stm32_fmc_bank target_bank;
	143	};
	144
	145	struct stm32_sdram_params {
	146	struct stm32_fmc_regs *base;
	147	u8 no_sdram_banks;
	148	struct bank_params bank_params[MAX_SDRAM_BANK];
7016651e	149	enum stm32_fmc_family family;
6c9a1003	150	};
bf1ae442 VM	151
	152	#define SDRAM_MODE_BL_SHIFT 0
	153	#define SDRAM_MODE_CAS_SHIFT 4
	154	#define SDRAM_MODE_BL 0
bf1ae442	155
6c9a1003	156	int stm32_sdram_init(struct udevice *dev)
bf1ae442	157	{
6c9a1003	158	struct stm32_sdram_params *params = dev_get_platdata(dev);
f303aaf2 PC	159	struct stm32_sdram_control *control;
f303aaf2 PC	160	struct stm32_sdram_timing *timing;
1421e0a3	161	struct stm32_fmc_regs *regs = params->base;
f303aaf2 PC	162	enum stm32_fmc_bank target_bank;
	163	u32 ctb; /* SDCMR register: Command Target Bank */
	164	u32 ref_count;
	165	u8 i;
	166
7016651e PC	167	/* disable the FMC controller */
	168	if (params->family == STM32H7_FMC)
	169	clrbits_le32(&regs->bcr1, FMC_BCR1_FMCEN);
	170
f303aaf2 PC	171	for (i = 0; i < params->no_sdram_banks; i++) {
	172	control = params->bank_params[i].sdram_control;
	173	timing = params->bank_params[i].sdram_timing;
	174	target_bank = params->bank_params[i].target_bank;
	175	ref_count = params->bank_params[i].sdram_ref_count;
	176
	177	writel(control->sdclk << FMC_SDCR_SDCLK_SHIFT
	178	\| control->cas_latency << FMC_SDCR_CAS_SHIFT
	179	\| control->no_banks << FMC_SDCR_NB_SHIFT
	180	\| control->memory_width << FMC_SDCR_MWID_SHIFT
	181	\| control->no_rows << FMC_SDCR_NR_SHIFT
	182	\| control->no_columns << FMC_SDCR_NC_SHIFT
	183	\| control->rd_pipe_delay << FMC_SDCR_RPIPE_SHIFT
	184	\| control->rd_burst << FMC_SDCR_RBURST_SHIFT,
	185	&regs->sdcr1);
	186
	187	if (target_bank == SDRAM_BANK2)
	188	writel(control->cas_latency << FMC_SDCR_CAS_SHIFT
	189	\| control->no_banks << FMC_SDCR_NB_SHIFT
	190	\| control->memory_width << FMC_SDCR_MWID_SHIFT
	191	\| control->no_rows << FMC_SDCR_NR_SHIFT
	192	\| control->no_columns << FMC_SDCR_NC_SHIFT,
	193	&regs->sdcr2);
	194
	195	writel(timing->trcd << FMC_SDTR_TRCD_SHIFT
	196	\| timing->trp << FMC_SDTR_TRP_SHIFT
	197	\| timing->twr << FMC_SDTR_TWR_SHIFT
	198	\| timing->trc << FMC_SDTR_TRC_SHIFT
	199	\| timing->tras << FMC_SDTR_TRAS_SHIFT
	200	\| timing->txsr << FMC_SDTR_TXSR_SHIFT
	201	\| timing->tmrd << FMC_SDTR_TMRD_SHIFT,
	202	&regs->sdtr1);
	203
	204	if (target_bank == SDRAM_BANK2)
	205	writel(timing->trcd << FMC_SDTR_TRCD_SHIFT
	206	\| timing->trp << FMC_SDTR_TRP_SHIFT
	207	\| timing->twr << FMC_SDTR_TWR_SHIFT
	208	\| timing->trc << FMC_SDTR_TRC_SHIFT
	209	\| timing->tras << FMC_SDTR_TRAS_SHIFT
	210	\| timing->txsr << FMC_SDTR_TXSR_SHIFT
	211	\| timing->tmrd << FMC_SDTR_TMRD_SHIFT,
	212	&regs->sdtr2);
7016651e	213
f303aaf2 PC	214	if (target_bank == SDRAM_BANK1)
	215	ctb = FMC_SDCMR_BANK_1;
	216	else
	217	ctb = FMC_SDCMR_BANK_2;
	218
	219	writel(ctb \| FMC_SDCMR_MODE_START_CLOCK, &regs->sdcmr);
	220	udelay(200); /* 200 us delay, page 10, "Power-Up" */
	221	FMC_BUSY_WAIT(regs);
	222
	223	writel(ctb \| FMC_SDCMR_MODE_PRECHARGE, &regs->sdcmr);
	224	udelay(100);
	225	FMC_BUSY_WAIT(regs);
	226
	227	writel((ctb \| FMC_SDCMR_MODE_AUTOREFRESH \| 7 << FMC_SDCMR_NRFS_SHIFT),
	228	&regs->sdcmr);
	229	udelay(100);
	230	FMC_BUSY_WAIT(regs);
	231
	232	writel(ctb \| (SDRAM_MODE_BL << SDRAM_MODE_BL_SHIFT
	233	\| control->cas_latency << SDRAM_MODE_CAS_SHIFT)
	234	<< FMC_SDCMR_MODE_REGISTER_SHIFT \| FMC_SDCMR_MODE_WRITE_MODE,
	235	&regs->sdcmr);
	236	udelay(100);
	237	FMC_BUSY_WAIT(regs);
	238
	239	writel(ctb \| FMC_SDCMR_MODE_NORMAL, &regs->sdcmr);
	240	FMC_BUSY_WAIT(regs);
	241
	242	/* Refresh timer */
	243	writel(ref_count << 1, &regs->sdrtr);
	244	}
bf1ae442	245
7016651e PC	246	/* enable the FMC controller */
	247	if (params->family == STM32H7_FMC)
	248	setbits_le32(&regs->bcr1, FMC_BCR1_FMCEN);
	249
bf1ae442 VM	250	return 0;
bf1ae442 VM	251	}
910a52ed	252
6c9a1003 VM	253	static int stm32_fmc_ofdata_to_platdata(struct udevice *dev)
6c9a1003 VM	254	{
6c9a1003	255	struct stm32_sdram_params *params = dev_get_platdata(dev);
f303aaf2	256	struct bank_params *bank_params;
0b3f789a PC	257	struct ofnode_phandle_args args;
	258	u32 *syscfg_base;
	259	u32 mem_remap;
f303aaf2 PC	260	ofnode bank_node;
	261	char *bank_name;
	262	u8 bank = 0;
0b3f789a PC	263	int ret;
	264
	265	mem_remap = dev_read_u32_default(dev, "st,mem_remap", NOT_FOUND);
	266	if (mem_remap != NOT_FOUND) {
	267	ret = dev_read_phandle_with_args(dev, "st,syscfg", NULL, 0, 0,
	268	&args);
	269	if (ret) {
	270	debug("%s: can't find syscon device (%d)\n", __func__,
	271	ret);
	272	return ret;
	273	}
	274
	275	syscfg_base = (u32 *)ofnode_get_addr(args.node);
	276
	277	/* set memory mapping selection */
	278	clrsetbits_le32(syscfg_base, MEM_MODE_MASK, mem_remap);
	279	} else {
	280	debug("%s: cannot find st,mem_remap property\n", __func__);
	281	}
6c9a1003	282
f39b90dc	283	dev_for_each_subnode(bank_node, dev) {
f303aaf2 PC	284	/* extract the bank index from DT */
	285	bank_name = (char *)ofnode_get_name(bank_node);
	286	strsep(&bank_name, "@");
	287	if (!bank_name) {
9b643e31	288	pr_err("missing sdram bank index");
f303aaf2 PC	289	return -EINVAL;
	290	}
	291
	292	bank_params = &params->bank_params[bank];
	293	strict_strtoul(bank_name, 10,
	294	(long unsigned int *)&bank_params->target_bank);
	295
	296	if (bank_params->target_bank >= MAX_SDRAM_BANK) {
9b643e31	297	pr_err("Found bank %d , but only bank 0 and 1 are supported",
f303aaf2 PC	298	bank_params->target_bank);
	299	return -EINVAL;
	300	}
	301
	302	debug("Find bank %s %u\n", bank_name, bank_params->target_bank);
	303
	304	params->bank_params[bank].sdram_control =
	305	(struct stm32_sdram_control *)
	306	ofnode_read_u8_array_ptr(bank_node,
	307	"st,sdram-control",
	308	sizeof(struct stm32_sdram_control));
	309
	310	if (!params->bank_params[bank].sdram_control) {
9b643e31	311	pr_err("st,sdram-control not found for %s",
f303aaf2	312	ofnode_get_name(bank_node));
f39b90dc PC	313	return -EINVAL;
	314	}
	315
f39b90dc	316
f303aaf2 PC	317	params->bank_params[bank].sdram_timing =
	318	(struct stm32_sdram_timing *)
	319	ofnode_read_u8_array_ptr(bank_node,
	320	"st,sdram-timing",
	321	sizeof(struct stm32_sdram_timing));
	322
	323	if (!params->bank_params[bank].sdram_timing) {
9b643e31	324	pr_err("st,sdram-timing not found for %s",
f303aaf2	325	ofnode_get_name(bank_node));
f39b90dc PC	326	return -EINVAL;
	327	}
	328
f303aaf2 PC	329
f303aaf2 PC	330	bank_params->sdram_ref_count = ofnode_read_u32_default(bank_node,
bfea69ad	331	"st,sdram-refcount", 8196);
f303aaf2	332	bank++;
6c9a1003 VM	333	}
6c9a1003 VM	334
f303aaf2 PC	335	params->no_sdram_banks = bank;
	336	debug("%s, no of banks = %d\n", __func__, params->no_sdram_banks);
	337
6c9a1003 VM	338	return 0;
	339	}
	340
910a52ed VM	341	static int stm32_fmc_probe(struct udevice *dev)
910a52ed VM	342	{
1421e0a3	343	struct stm32_sdram_params *params = dev_get_platdata(dev);
d0b24c1a	344	int ret;
1421e0a3 PC	345	fdt_addr_t addr;
	346
	347	addr = dev_read_addr(dev);
	348	if (addr == FDT_ADDR_T_NONE)
	349	return -EINVAL;
	350
	351	params->base = (struct stm32_fmc_regs *)addr;
7016651e	352	params->family = dev_get_driver_data(dev);
1421e0a3	353
14a50e37	354	#ifdef CONFIG_CLK
d0b24c1a	355	struct clk clk;
6c9a1003	356
d0b24c1a VM	357	ret = clk_get_by_index(dev, 0, &clk);
	358	if (ret < 0)
	359	return ret;
	360
	361	ret = clk_enable(&clk);
	362
	363	if (ret) {
	364	dev_err(dev, "failed to enable clock\n");
	365	return ret;
	366	}
	367	#endif
6c9a1003 VM	368	ret = stm32_sdram_init(dev);
	369	if (ret)
	370	return ret;
	371
910a52ed VM	372	return 0;
	373	}
	374
	375	static int stm32_fmc_get_info(struct udevice dev, struct ram_info info)
	376	{
910a52ed VM	377	return 0;
	378	}
	379
	380	static struct ram_ops stm32_fmc_ops = {
	381	.get_info = stm32_fmc_get_info,
	382	};
	383
	384	static const struct udevice_id stm32_fmc_ids[] = {
7016651e PC	385	{ .compatible = "st,stm32-fmc", .data = STM32F7_FMC },
7016651e PC	386	{ .compatible = "st,stm32h7-fmc", .data = STM32H7_FMC },
910a52ed VM	387	{ }
	388	};
	389
	390	U_BOOT_DRIVER(stm32_fmc) = {
	391	.name = "stm32_fmc",
	392	.id = UCLASS_RAM,
	393	.of_match = stm32_fmc_ids,
	394	.ops = &stm32_fmc_ops,
6c9a1003	395	.ofdata_to_platdata = stm32_fmc_ofdata_to_platdata,
910a52ed	396	.probe = stm32_fmc_probe,
6c9a1003	397	.platdata_auto_alloc_size = sizeof(struct stm32_sdram_params),
910a52ed	398	};