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

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

#include <common.h>
#include <clk.h>
#include <dm.h>
#include <init.h>
#include <log.h>
#include <ram.h>
#include <asm/io.h>
#include <dm/device_compat.h>
#include <linux/bitops.h>
#include <linux/delay.h>

#define MEM_MODE_MASK	GENMASK(2, 0)
#define SWP_FMC_OFFSET 10
#define SWP_FMC_MASK	GENMASK(SWP_FMC_OFFSET+1, SWP_FMC_OFFSET)
#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;
	u32 swp_fmc;
	ofnode bank_node;
	char *bank_name;
	u8 bank = 0;
	int ret;

	ret = dev_read_phandle_with_args(dev, "st,syscfg", NULL, 0, 0,
						 &args);
	if (ret) {
		dev_dbg(dev, "%s: can't find syscon device (%d)\n", __func__, ret);
	} else {
		syscfg_base = (u32 *)ofnode_get_addr(args.node);

		mem_remap = dev_read_u32_default(dev, "st,mem_remap", NOT_FOUND);
		if (mem_remap != NOT_FOUND) {
			/* set memory mapping selection */
			clrsetbits_le32(syscfg_base, MEM_MODE_MASK, mem_remap);
		} else {
			dev_dbg(dev, "%s: cannot find st,mem_remap property\n", __func__);
		}
		
		swp_fmc = dev_read_u32_default(dev, "st,swp_fmc", NOT_FOUND);
		if (swp_fmc != NOT_FOUND) {
			/* set fmc swapping selection */
			clrsetbits_le32(syscfg_base, SWP_FMC_MASK, swp_fmc << SWP_FMC_OFFSET);
		} else {
			dev_dbg(dev, "%s: cannot find st,swp_fmc property\n", __func__);
		}

		dev_dbg(dev, "syscfg %x = %x\n", (u32)syscfg_base, *syscfg_base);
	}

	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	= sizeof(struct stm32_sdram_params),
};
Commit	Line	Data
83d290c5	1	// SPDX-License-Identifier: GPL-2.0+
bf1ae442	2	/*
3bc599c9 PC	3	* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
3bc599c9 PC	4	* Author(s): Vikas Manocha, <[email protected]> for STMicroelectronics.
bf1ae442 VM	5	*/
	6
	7	#include <common.h>
d0b24c1a	8	#include <clk.h>
910a52ed	9	#include <dm.h>
691d719d	10	#include <init.h>
f7ae49fc	11	#include <log.h>
910a52ed	12	#include <ram.h>
bf1ae442	13	#include <asm/io.h>
336d4615	14	#include <dm/device_compat.h>
cd93d625	15	#include <linux/bitops.h>
c05ed00a	16	#include <linux/delay.h>
bf1ae442	17
0b3f789a	18	#define MEM_MODE_MASK GENMASK(2, 0)
246a5e5f RP	19	#define SWP_FMC_OFFSET 10
246a5e5f RP	20	#define SWP_FMC_MASK GENMASK(SWP_FMC_OFFSET+1, SWP_FMC_OFFSET)
0b3f789a PC	21	#define NOT_FOUND 0xff
0b3f789a PC	22
9242ece1	23	struct stm32_fmc_regs {
1421e0a3 PC	24	/* 0x0 */
	25	u32 bcr1; /* NOR/PSRAM Chip select control register 1 */
	26	u32 btr1; /* SRAM/NOR-Flash Chip select timing register 1 */
	27	u32 bcr2; /* NOR/PSRAM Chip select Control register 2 */
	28	u32 btr2; /* SRAM/NOR-Flash Chip select timing register 2 */
	29	u32 bcr3; /* NOR/PSRAMChip select Control register 3 */
	30	u32 btr3; /* SRAM/NOR-Flash Chip select timing register 3 */
	31	u32 bcr4; /* NOR/PSRAM Chip select Control register 4 */
	32	u32 btr4; /* SRAM/NOR-Flash Chip select timing register 4 */
	33	u32 reserved1[24];
	34
	35	/* 0x80 */
	36	u32 pcr; /* NAND Flash control register */
	37	u32 sr; /* FIFO status and interrupt register */
	38	u32 pmem; /* Common memory space timing register */
	39	u32 patt; /* Attribute memory space timing registers */
	40	u32 reserved2[1];
	41	u32 eccr; /* ECC result registers */
	42	u32 reserved3[27];
	43
	44	/* 0x104 */
	45	u32 bwtr1; /* SRAM/NOR-Flash write timing register 1 */
	46	u32 reserved4[1];
	47	u32 bwtr2; /* SRAM/NOR-Flash write timing register 2 */
	48	u32 reserved5[1];
	49	u32 bwtr3; /* SRAM/NOR-Flash write timing register 3 */
	50	u32 reserved6[1];
	51	u32 bwtr4; /* SRAM/NOR-Flash write timing register 4 */
	52	u32 reserved7[8];
	53
	54	/* 0x140 */
	55	u32 sdcr1; /* SDRAM Control register 1 */
	56	u32 sdcr2; /* SDRAM Control register 2 */
	57	u32 sdtr1; /* SDRAM Timing register 1 */
	58	u32 sdtr2; /* SDRAM Timing register 2 */
	59	u32 sdcmr; /* SDRAM Mode register */
	60	u32 sdrtr; /* SDRAM Refresh timing register */
	61	u32 sdsr; /* SDRAM Status register */
9242ece1 PC	62	};
9242ece1 PC	63
7016651e PC	64	/*
	65	* NOR/PSRAM Control register BCR1
	66	* FMC controller Enable, only availabe for H7
	67	*/
	68	#define FMC_BCR1_FMCEN BIT(31)
	69
9242ece1 PC	70	/* Control register SDCR */
	71	#define FMC_SDCR_RPIPE_SHIFT 13 /* RPIPE bit shift */
	72	#define FMC_SDCR_RBURST_SHIFT 12 /* RBURST bit shift */
	73	#define FMC_SDCR_SDCLK_SHIFT 10 /* SDRAM clock divisor shift */
	74	#define FMC_SDCR_WP_SHIFT 9 /* Write protection shift */
	75	#define FMC_SDCR_CAS_SHIFT 7 /* CAS latency shift */
	76	#define FMC_SDCR_NB_SHIFT 6 /* Number of banks shift */
	77	#define FMC_SDCR_MWID_SHIFT 4 /* Memory width shift */
	78	#define FMC_SDCR_NR_SHIFT 2 /* Number of row address bits shift */
	79	#define FMC_SDCR_NC_SHIFT 0 /* Number of col address bits shift */
	80
	81	/* Timings register SDTR */
	82	#define FMC_SDTR_TMRD_SHIFT 0 /* Load mode register to active */
	83	#define FMC_SDTR_TXSR_SHIFT 4 /* Exit self-refresh time */
	84	#define FMC_SDTR_TRAS_SHIFT 8 /* Self-refresh time */
	85	#define FMC_SDTR_TRC_SHIFT 12 /* Row cycle delay */
	86	#define FMC_SDTR_TWR_SHIFT 16 /* Recovery delay */
	87	#define FMC_SDTR_TRP_SHIFT 20 /* Row precharge delay */
	88	#define FMC_SDTR_TRCD_SHIFT 24 /* Row-to-column delay */
	89
	90	#define FMC_SDCMR_NRFS_SHIFT 5
	91
	92	#define FMC_SDCMR_MODE_NORMAL 0
	93	#define FMC_SDCMR_MODE_START_CLOCK 1
	94	#define FMC_SDCMR_MODE_PRECHARGE 2
	95	#define FMC_SDCMR_MODE_AUTOREFRESH 3
	96	#define FMC_SDCMR_MODE_WRITE_MODE 4
	97	#define FMC_SDCMR_MODE_SELFREFRESH 5
	98	#define FMC_SDCMR_MODE_POWERDOWN 6
	99
	100	#define FMC_SDCMR_BANK_1 BIT(4)
	101	#define FMC_SDCMR_BANK_2 BIT(3)
	102
	103	#define FMC_SDCMR_MODE_REGISTER_SHIFT 9
	104
	105	#define FMC_SDSR_BUSY BIT(5)
	106
1421e0a3	107	#define FMC_BUSY_WAIT(regs) do { \
9242ece1	108	__asm__ __volatile__ ("dsb" : : : "memory"); \
1421e0a3	109	while (regs->sdsr & FMC_SDSR_BUSY) \
9242ece1 PC	110	; \
	111	} while (0)
	112
6c9a1003 VM	113	struct stm32_sdram_control {
	114	u8 no_columns;
	115	u8 no_rows;
	116	u8 memory_width;
	117	u8 no_banks;
	118	u8 cas_latency;
bfea69ad	119	u8 sdclk;
6c9a1003 VM	120	u8 rd_burst;
	121	u8 rd_pipe_delay;
	122	};
	123
	124	struct stm32_sdram_timing {
	125	u8 tmrd;
	126	u8 txsr;
	127	u8 tras;
	128	u8 trc;
	129	u8 trp;
bfea69ad	130	u8 twr;
6c9a1003 VM	131	u8 trcd;
6c9a1003 VM	132	};
f303aaf2 PC	133	enum stm32_fmc_bank {
	134	SDRAM_BANK1,
	135	SDRAM_BANK2,
	136	MAX_SDRAM_BANK,
	137	};
	138
7016651e PC	139	enum stm32_fmc_family {
	140	STM32F7_FMC,
	141	STM32H7_FMC,
	142	};
	143
f303aaf2	144	struct bank_params {
f39b90dc PC	145	struct stm32_sdram_control *sdram_control;
f39b90dc PC	146	struct stm32_sdram_timing *sdram_timing;
bfea69ad	147	u32 sdram_ref_count;
f303aaf2 PC	148	enum stm32_fmc_bank target_bank;
	149	};
	150
	151	struct stm32_sdram_params {
	152	struct stm32_fmc_regs *base;
	153	u8 no_sdram_banks;
	154	struct bank_params bank_params[MAX_SDRAM_BANK];
7016651e	155	enum stm32_fmc_family family;
6c9a1003	156	};
bf1ae442 VM	157
	158	#define SDRAM_MODE_BL_SHIFT 0
	159	#define SDRAM_MODE_CAS_SHIFT 4
	160	#define SDRAM_MODE_BL 0
bf1ae442	161
6c9a1003	162	int stm32_sdram_init(struct udevice *dev)
bf1ae442	163	{
6c9a1003	164	struct stm32_sdram_params *params = dev_get_platdata(dev);
f303aaf2 PC	165	struct stm32_sdram_control *control;
f303aaf2 PC	166	struct stm32_sdram_timing *timing;
1421e0a3	167	struct stm32_fmc_regs *regs = params->base;
f303aaf2 PC	168	enum stm32_fmc_bank target_bank;
	169	u32 ctb; /* SDCMR register: Command Target Bank */
	170	u32 ref_count;
	171	u8 i;
	172
7016651e PC	173	/* disable the FMC controller */
	174	if (params->family == STM32H7_FMC)
	175	clrbits_le32(&regs->bcr1, FMC_BCR1_FMCEN);
	176
f303aaf2 PC	177	for (i = 0; i < params->no_sdram_banks; i++) {
	178	control = params->bank_params[i].sdram_control;
	179	timing = params->bank_params[i].sdram_timing;
	180	target_bank = params->bank_params[i].target_bank;
	181	ref_count = params->bank_params[i].sdram_ref_count;
	182
	183	writel(control->sdclk << FMC_SDCR_SDCLK_SHIFT
	184	\| control->cas_latency << FMC_SDCR_CAS_SHIFT
	185	\| control->no_banks << FMC_SDCR_NB_SHIFT
	186	\| control->memory_width << FMC_SDCR_MWID_SHIFT
	187	\| control->no_rows << FMC_SDCR_NR_SHIFT
	188	\| control->no_columns << FMC_SDCR_NC_SHIFT
	189	\| control->rd_pipe_delay << FMC_SDCR_RPIPE_SHIFT
	190	\| control->rd_burst << FMC_SDCR_RBURST_SHIFT,
	191	&regs->sdcr1);
	192
	193	if (target_bank == SDRAM_BANK2)
	194	writel(control->cas_latency << FMC_SDCR_CAS_SHIFT
	195	\| control->no_banks << FMC_SDCR_NB_SHIFT
	196	\| control->memory_width << FMC_SDCR_MWID_SHIFT
	197	\| control->no_rows << FMC_SDCR_NR_SHIFT
	198	\| control->no_columns << FMC_SDCR_NC_SHIFT,
	199	&regs->sdcr2);
	200
	201	writel(timing->trcd << FMC_SDTR_TRCD_SHIFT
	202	\| timing->trp << FMC_SDTR_TRP_SHIFT
	203	\| timing->twr << FMC_SDTR_TWR_SHIFT
	204	\| timing->trc << FMC_SDTR_TRC_SHIFT
	205	\| timing->tras << FMC_SDTR_TRAS_SHIFT
	206	\| timing->txsr << FMC_SDTR_TXSR_SHIFT
	207	\| timing->tmrd << FMC_SDTR_TMRD_SHIFT,
	208	&regs->sdtr1);
	209
	210	if (target_bank == SDRAM_BANK2)
	211	writel(timing->trcd << FMC_SDTR_TRCD_SHIFT
	212	\| timing->trp << FMC_SDTR_TRP_SHIFT
	213	\| timing->twr << FMC_SDTR_TWR_SHIFT
	214	\| timing->trc << FMC_SDTR_TRC_SHIFT
	215	\| timing->tras << FMC_SDTR_TRAS_SHIFT
	216	\| timing->txsr << FMC_SDTR_TXSR_SHIFT
	217	\| timing->tmrd << FMC_SDTR_TMRD_SHIFT,
	218	&regs->sdtr2);
7016651e	219
f303aaf2 PC	220	if (target_bank == SDRAM_BANK1)
	221	ctb = FMC_SDCMR_BANK_1;
	222	else
	223	ctb = FMC_SDCMR_BANK_2;
	224
	225	writel(ctb \| FMC_SDCMR_MODE_START_CLOCK, &regs->sdcmr);
	226	udelay(200); /* 200 us delay, page 10, "Power-Up" */
	227	FMC_BUSY_WAIT(regs);
	228
	229	writel(ctb \| FMC_SDCMR_MODE_PRECHARGE, &regs->sdcmr);
	230	udelay(100);
	231	FMC_BUSY_WAIT(regs);
	232
	233	writel((ctb \| FMC_SDCMR_MODE_AUTOREFRESH \| 7 << FMC_SDCMR_NRFS_SHIFT),
	234	&regs->sdcmr);
	235	udelay(100);
	236	FMC_BUSY_WAIT(regs);
	237
	238	writel(ctb \| (SDRAM_MODE_BL << SDRAM_MODE_BL_SHIFT
	239	\| control->cas_latency << SDRAM_MODE_CAS_SHIFT)
	240	<< FMC_SDCMR_MODE_REGISTER_SHIFT \| FMC_SDCMR_MODE_WRITE_MODE,
	241	&regs->sdcmr);
	242	udelay(100);
	243	FMC_BUSY_WAIT(regs);
	244
	245	writel(ctb \| FMC_SDCMR_MODE_NORMAL, &regs->sdcmr);
	246	FMC_BUSY_WAIT(regs);
	247
	248	/* Refresh timer */
	249	writel(ref_count << 1, &regs->sdrtr);
	250	}
bf1ae442	251
7016651e PC	252	/* enable the FMC controller */
	253	if (params->family == STM32H7_FMC)
	254	setbits_le32(&regs->bcr1, FMC_BCR1_FMCEN);
	255
bf1ae442 VM	256	return 0;
bf1ae442 VM	257	}
910a52ed	258
6c9a1003 VM	259	static int stm32_fmc_ofdata_to_platdata(struct udevice *dev)
6c9a1003 VM	260	{
6c9a1003	261	struct stm32_sdram_params *params = dev_get_platdata(dev);
f303aaf2	262	struct bank_params *bank_params;
0b3f789a PC	263	struct ofnode_phandle_args args;
	264	u32 *syscfg_base;
	265	u32 mem_remap;
246a5e5f	266	u32 swp_fmc;
f303aaf2 PC	267	ofnode bank_node;
	268	char *bank_name;
	269	u8 bank = 0;
0b3f789a PC	270	int ret;
0b3f789a PC	271
246a5e5f	272	ret = dev_read_phandle_with_args(dev, "st,syscfg", NULL, 0, 0,
0b3f789a	273	&args);
246a5e5f RP	274	if (ret) {
	275	dev_dbg(dev, "%s: can't find syscon device (%d)\n", __func__, ret);
	276	} else {
0b3f789a PC	277	syscfg_base = (u32 *)ofnode_get_addr(args.node);
0b3f789a PC	278
246a5e5f RP	279	mem_remap = dev_read_u32_default(dev, "st,mem_remap", NOT_FOUND);
	280	if (mem_remap != NOT_FOUND) {
	281	/* set memory mapping selection */
	282	clrsetbits_le32(syscfg_base, MEM_MODE_MASK, mem_remap);
	283	} else {
	284	dev_dbg(dev, "%s: cannot find st,mem_remap property\n", __func__);
	285	}
	286
	287	swp_fmc = dev_read_u32_default(dev, "st,swp_fmc", NOT_FOUND);
	288	if (swp_fmc != NOT_FOUND) {
	289	/* set fmc swapping selection */
	290	clrsetbits_le32(syscfg_base, SWP_FMC_MASK, swp_fmc << SWP_FMC_OFFSET);
	291	} else {
	292	dev_dbg(dev, "%s: cannot find st,swp_fmc property\n", __func__);
	293	}
	294
	295	dev_dbg(dev, "syscfg %x = %x\n", (u32)syscfg_base, *syscfg_base);
0b3f789a	296	}
6c9a1003	297
f39b90dc	298	dev_for_each_subnode(bank_node, dev) {
f303aaf2 PC	299	/* extract the bank index from DT */
	300	bank_name = (char *)ofnode_get_name(bank_node);
	301	strsep(&bank_name, "@");
	302	if (!bank_name) {
9b643e31	303	pr_err("missing sdram bank index");
f303aaf2 PC	304	return -EINVAL;
	305	}
	306
	307	bank_params = &params->bank_params[bank];
	308	strict_strtoul(bank_name, 10,
	309	(long unsigned int *)&bank_params->target_bank);
	310
	311	if (bank_params->target_bank >= MAX_SDRAM_BANK) {
9b643e31	312	pr_err("Found bank %d , but only bank 0 and 1 are supported",
f303aaf2 PC	313	bank_params->target_bank);
	314	return -EINVAL;
	315	}
	316
	317	debug("Find bank %s %u\n", bank_name, bank_params->target_bank);
	318
	319	params->bank_params[bank].sdram_control =
	320	(struct stm32_sdram_control *)
	321	ofnode_read_u8_array_ptr(bank_node,
	322	"st,sdram-control",
	323	sizeof(struct stm32_sdram_control));
	324
	325	if (!params->bank_params[bank].sdram_control) {
9b643e31	326	pr_err("st,sdram-control not found for %s",
f303aaf2	327	ofnode_get_name(bank_node));
f39b90dc PC	328	return -EINVAL;
	329	}
	330
f39b90dc	331
f303aaf2 PC	332	params->bank_params[bank].sdram_timing =
	333	(struct stm32_sdram_timing *)
	334	ofnode_read_u8_array_ptr(bank_node,
	335	"st,sdram-timing",
	336	sizeof(struct stm32_sdram_timing));
	337
	338	if (!params->bank_params[bank].sdram_timing) {
9b643e31	339	pr_err("st,sdram-timing not found for %s",
f303aaf2	340	ofnode_get_name(bank_node));
f39b90dc PC	341	return -EINVAL;
	342	}
	343
f303aaf2 PC	344
f303aaf2 PC	345	bank_params->sdram_ref_count = ofnode_read_u32_default(bank_node,
bfea69ad	346	"st,sdram-refcount", 8196);
f303aaf2	347	bank++;
6c9a1003 VM	348	}
6c9a1003 VM	349
f303aaf2 PC	350	params->no_sdram_banks = bank;
	351	debug("%s, no of banks = %d\n", __func__, params->no_sdram_banks);
	352
6c9a1003 VM	353	return 0;
	354	}
	355
910a52ed VM	356	static int stm32_fmc_probe(struct udevice *dev)
910a52ed VM	357	{
1421e0a3	358	struct stm32_sdram_params *params = dev_get_platdata(dev);
d0b24c1a	359	int ret;
1421e0a3 PC	360	fdt_addr_t addr;
	361
	362	addr = dev_read_addr(dev);
	363	if (addr == FDT_ADDR_T_NONE)
	364	return -EINVAL;
	365
	366	params->base = (struct stm32_fmc_regs *)addr;
7016651e	367	params->family = dev_get_driver_data(dev);
1421e0a3	368
14a50e37	369	#ifdef CONFIG_CLK
d0b24c1a	370	struct clk clk;
6c9a1003	371
d0b24c1a VM	372	ret = clk_get_by_index(dev, 0, &clk);
	373	if (ret < 0)
	374	return ret;
	375
	376	ret = clk_enable(&clk);
	377
	378	if (ret) {
	379	dev_err(dev, "failed to enable clock\n");
	380	return ret;
	381	}
	382	#endif
6c9a1003 VM	383	ret = stm32_sdram_init(dev);
	384	if (ret)
	385	return ret;
	386
910a52ed VM	387	return 0;
	388	}
	389
	390	static int stm32_fmc_get_info(struct udevice dev, struct ram_info info)
	391	{
910a52ed VM	392	return 0;
	393	}
	394
	395	static struct ram_ops stm32_fmc_ops = {
	396	.get_info = stm32_fmc_get_info,
	397	};
	398
	399	static const struct udevice_id stm32_fmc_ids[] = {
7016651e PC	400	{ .compatible = "st,stm32-fmc", .data = STM32F7_FMC },
7016651e PC	401	{ .compatible = "st,stm32h7-fmc", .data = STM32H7_FMC },
910a52ed VM	402	{ }
	403	};
	404
	405	U_BOOT_DRIVER(stm32_fmc) = {
	406	.name = "stm32_fmc",
	407	.id = UCLASS_RAM,
	408	.of_match = stm32_fmc_ids,
	409	.ops = &stm32_fmc_ops,
6c9a1003	410	.ofdata_to_platdata = stm32_fmc_ofdata_to_platdata,
910a52ed	411	.probe = stm32_fmc_probe,
41575d8e	412	.platdata_auto = sizeof(struct stm32_sdram_params),
910a52ed	413	};