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

/*
 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
 * Author(s): Vikas Manocha, <vikas.manocha@st.com> for STMicroelectronics.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

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

DECLARE_GLOBAL_DATA_PTR;

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;
	ofnode bank_node;
	char *bank_name;
	u8 bank = 0;

	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, <vikas.manocha@st.com> 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
6c9a1003 VM	14	DECLARE_GLOBAL_DATA_PTR;
6c9a1003 VM	15
9242ece1	16	struct stm32_fmc_regs {
1421e0a3 PC	17	/* 0x0 */
	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 */
	26	u32 reserved1[24];
	27
	28	/* 0x80 */
	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 */
	33	u32 reserved2[1];
	34	u32 eccr; /* ECC result registers */
	35	u32 reserved3[27];
	36
	37	/* 0x104 */
	38	u32 bwtr1; /* SRAM/NOR-Flash write timing register 1 */
	39	u32 reserved4[1];
	40	u32 bwtr2; /* SRAM/NOR-Flash write timing register 2 */
	41	u32 reserved5[1];
	42	u32 bwtr3; /* SRAM/NOR-Flash write timing register 3 */
	43	u32 reserved6[1];
	44	u32 bwtr4; /* SRAM/NOR-Flash write timing register 4 */
	45	u32 reserved7[8];
	46
	47	/* 0x140 */
	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 */
9242ece1 PC	55	};
9242ece1 PC	56
7016651e PC	57	/*
	58	* NOR/PSRAM Control register BCR1
	59	* FMC controller Enable, only availabe for H7
	60	*/
	61	#define FMC_BCR1_FMCEN BIT(31)
	62
9242ece1 PC	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 */
	73
	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 */
	82
	83	#define FMC_SDCMR_NRFS_SHIFT 5
	84
	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
	92
	93	#define FMC_SDCMR_BANK_1 BIT(4)
	94	#define FMC_SDCMR_BANK_2 BIT(3)
	95
	96	#define FMC_SDCMR_MODE_REGISTER_SHIFT 9
	97
	98	#define FMC_SDSR_BUSY BIT(5)
	99
1421e0a3	100	#define FMC_BUSY_WAIT(regs) do { \
9242ece1	101	__asm__ __volatile__ ("dsb" : : : "memory"); \
1421e0a3	102	while (regs->sdsr & FMC_SDSR_BUSY) \
9242ece1 PC	103	; \
	104	} while (0)
	105
6c9a1003 VM	106	struct stm32_sdram_control {
	107	u8 no_columns;
	108	u8 no_rows;
	109	u8 memory_width;
	110	u8 no_banks;
	111	u8 cas_latency;
bfea69ad	112	u8 sdclk;
6c9a1003 VM	113	u8 rd_burst;
	114	u8 rd_pipe_delay;
	115	};
	116
	117	struct stm32_sdram_timing {
	118	u8 tmrd;
	119	u8 txsr;
	120	u8 tras;
	121	u8 trc;
	122	u8 trp;
bfea69ad	123	u8 twr;
6c9a1003 VM	124	u8 trcd;
6c9a1003 VM	125	};
f303aaf2 PC	126	enum stm32_fmc_bank {
	127	SDRAM_BANK1,
	128	SDRAM_BANK2,
	129	MAX_SDRAM_BANK,
	130	};
	131
7016651e PC	132	enum stm32_fmc_family {
	133	STM32F7_FMC,
	134	STM32H7_FMC,
	135	};
	136
f303aaf2	137	struct bank_params {
f39b90dc PC	138	struct stm32_sdram_control *sdram_control;
f39b90dc PC	139	struct stm32_sdram_timing *sdram_timing;
bfea69ad	140	u32 sdram_ref_count;
f303aaf2 PC	141	enum stm32_fmc_bank target_bank;
	142	};
	143
	144	struct stm32_sdram_params {
	145	struct stm32_fmc_regs *base;
	146	u8 no_sdram_banks;
	147	struct bank_params bank_params[MAX_SDRAM_BANK];
7016651e	148	enum stm32_fmc_family family;
6c9a1003	149	};
bf1ae442 VM	150
	151	#define SDRAM_MODE_BL_SHIFT 0
	152	#define SDRAM_MODE_CAS_SHIFT 4
	153	#define SDRAM_MODE_BL 0
bf1ae442	154
6c9a1003	155	int stm32_sdram_init(struct udevice *dev)
bf1ae442	156	{
6c9a1003	157	struct stm32_sdram_params *params = dev_get_platdata(dev);
f303aaf2 PC	158	struct stm32_sdram_control *control;
f303aaf2 PC	159	struct stm32_sdram_timing *timing;
1421e0a3	160	struct stm32_fmc_regs *regs = params->base;
f303aaf2 PC	161	enum stm32_fmc_bank target_bank;
	162	u32 ctb; /* SDCMR register: Command Target Bank */
	163	u32 ref_count;
	164	u8 i;
	165
7016651e PC	166	/* disable the FMC controller */
	167	if (params->family == STM32H7_FMC)
	168	clrbits_le32(&regs->bcr1, FMC_BCR1_FMCEN);
	169
f303aaf2 PC	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;
	175
	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,
	184	&regs->sdcr1);
	185
	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,
	192	&regs->sdcr2);
	193
	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,
	201	&regs->sdtr1);
	202
	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,
	211	&regs->sdtr2);
7016651e	212
f303aaf2 PC	213	if (target_bank == SDRAM_BANK1)
	214	ctb = FMC_SDCMR_BANK_1;
	215	else
	216	ctb = FMC_SDCMR_BANK_2;
	217
	218	writel(ctb \| FMC_SDCMR_MODE_START_CLOCK, &regs->sdcmr);
	219	udelay(200); /* 200 us delay, page 10, "Power-Up" */
	220	FMC_BUSY_WAIT(regs);
	221
	222	writel(ctb \| FMC_SDCMR_MODE_PRECHARGE, &regs->sdcmr);
	223	udelay(100);
	224	FMC_BUSY_WAIT(regs);
	225
	226	writel((ctb \| FMC_SDCMR_MODE_AUTOREFRESH \| 7 << FMC_SDCMR_NRFS_SHIFT),
	227	&regs->sdcmr);
	228	udelay(100);
	229	FMC_BUSY_WAIT(regs);
	230
	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,
	234	&regs->sdcmr);
	235	udelay(100);
	236	FMC_BUSY_WAIT(regs);
	237
	238	writel(ctb \| FMC_SDCMR_MODE_NORMAL, &regs->sdcmr);
	239	FMC_BUSY_WAIT(regs);
	240
	241	/* Refresh timer */
	242	writel(ref_count << 1, &regs->sdrtr);
	243	}
bf1ae442	244
7016651e PC	245	/* enable the FMC controller */
	246	if (params->family == STM32H7_FMC)
	247	setbits_le32(&regs->bcr1, FMC_BCR1_FMCEN);
	248
bf1ae442 VM	249	return 0;
bf1ae442 VM	250	}
910a52ed	251
6c9a1003 VM	252	static int stm32_fmc_ofdata_to_platdata(struct udevice *dev)
6c9a1003 VM	253	{
6c9a1003	254	struct stm32_sdram_params *params = dev_get_platdata(dev);
f303aaf2 PC	255	struct bank_params *bank_params;
	256	ofnode bank_node;
	257	char *bank_name;
	258	u8 bank = 0;
6c9a1003	259
f39b90dc	260	dev_for_each_subnode(bank_node, dev) {
f303aaf2 PC	261	/* extract the bank index from DT */
	262	bank_name = (char *)ofnode_get_name(bank_node);
	263	strsep(&bank_name, "@");
	264	if (!bank_name) {
9b643e31	265	pr_err("missing sdram bank index");
f303aaf2 PC	266	return -EINVAL;
	267	}
	268
	269	bank_params = &params->bank_params[bank];
	270	strict_strtoul(bank_name, 10,
	271	(long unsigned int *)&bank_params->target_bank);
	272
	273	if (bank_params->target_bank >= MAX_SDRAM_BANK) {
9b643e31	274	pr_err("Found bank %d , but only bank 0 and 1 are supported",
f303aaf2 PC	275	bank_params->target_bank);
	276	return -EINVAL;
	277	}
	278
	279	debug("Find bank %s %u\n", bank_name, bank_params->target_bank);
	280
	281	params->bank_params[bank].sdram_control =
	282	(struct stm32_sdram_control *)
	283	ofnode_read_u8_array_ptr(bank_node,
	284	"st,sdram-control",
	285	sizeof(struct stm32_sdram_control));
	286
	287	if (!params->bank_params[bank].sdram_control) {
9b643e31	288	pr_err("st,sdram-control not found for %s",
f303aaf2	289	ofnode_get_name(bank_node));
f39b90dc PC	290	return -EINVAL;
	291	}
	292
f39b90dc	293
f303aaf2 PC	294	params->bank_params[bank].sdram_timing =
	295	(struct stm32_sdram_timing *)
	296	ofnode_read_u8_array_ptr(bank_node,
	297	"st,sdram-timing",
	298	sizeof(struct stm32_sdram_timing));
	299
	300	if (!params->bank_params[bank].sdram_timing) {
9b643e31	301	pr_err("st,sdram-timing not found for %s",
f303aaf2	302	ofnode_get_name(bank_node));
f39b90dc PC	303	return -EINVAL;
	304	}
	305
f303aaf2 PC	306
f303aaf2 PC	307	bank_params->sdram_ref_count = ofnode_read_u32_default(bank_node,
bfea69ad	308	"st,sdram-refcount", 8196);
f303aaf2	309	bank++;
6c9a1003 VM	310	}
6c9a1003 VM	311
f303aaf2 PC	312	params->no_sdram_banks = bank;
	313	debug("%s, no of banks = %d\n", __func__, params->no_sdram_banks);
	314
6c9a1003 VM	315	return 0;
	316	}
	317
910a52ed VM	318	static int stm32_fmc_probe(struct udevice *dev)
910a52ed VM	319	{
1421e0a3	320	struct stm32_sdram_params *params = dev_get_platdata(dev);
d0b24c1a	321	int ret;
1421e0a3 PC	322	fdt_addr_t addr;
	323
	324	addr = dev_read_addr(dev);
	325	if (addr == FDT_ADDR_T_NONE)
	326	return -EINVAL;
	327
	328	params->base = (struct stm32_fmc_regs *)addr;
7016651e	329	params->family = dev_get_driver_data(dev);
1421e0a3	330
14a50e37	331	#ifdef CONFIG_CLK
d0b24c1a	332	struct clk clk;
6c9a1003	333
d0b24c1a VM	334	ret = clk_get_by_index(dev, 0, &clk);
	335	if (ret < 0)
	336	return ret;
	337
	338	ret = clk_enable(&clk);
	339
	340	if (ret) {
	341	dev_err(dev, "failed to enable clock\n");
	342	return ret;
	343	}
	344	#endif
6c9a1003 VM	345	ret = stm32_sdram_init(dev);
	346	if (ret)
	347	return ret;
	348
910a52ed VM	349	return 0;
	350	}
	351
	352	static int stm32_fmc_get_info(struct udevice dev, struct ram_info info)
	353	{
910a52ed VM	354	return 0;
	355	}
	356
	357	static struct ram_ops stm32_fmc_ops = {
	358	.get_info = stm32_fmc_get_info,
	359	};
	360
	361	static const struct udevice_id stm32_fmc_ids[] = {
7016651e PC	362	{ .compatible = "st,stm32-fmc", .data = STM32F7_FMC },
7016651e PC	363	{ .compatible = "st,stm32h7-fmc", .data = STM32H7_FMC },
910a52ed VM	364	{ }
	365	};
	366
	367	U_BOOT_DRIVER(stm32_fmc) = {
	368	.name = "stm32_fmc",
	369	.id = UCLASS_RAM,
	370	.of_match = stm32_fmc_ids,
	371	.ops = &stm32_fmc_ops,
6c9a1003	372	.ofdata_to_platdata = stm32_fmc_ofdata_to_platdata,
910a52ed	373	.probe = stm32_fmc_probe,
6c9a1003	374	.platdata_auto_alloc_size = sizeof(struct stm32_sdram_params),
910a52ed	375	};