u-boot/drivers/mtd/spi/spi_flash_probe.c

/*
 * SPI flash probing
 *
 * Copyright (C) 2008 Atmel Corporation
 * Copyright (C) 2010 Reinhard Meyer, EMK Elektronik
 * Copyright (C) 2013 Jagannadha Sutradharudu Teki, Xilinx Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#include <common.h>
#include <fdtdec.h>
#include <malloc.h>
#include <spi.h>
#include <spi_flash.h>

#include "spi_flash_internal.h"

DECLARE_GLOBAL_DATA_PTR;

#ifdef CONFIG_SPI_FLASH_BAR
int spi_flash_bank_config(struct spi_flash *flash, u8 idcode0)
{
	u8 cmd;
	u8 curr_bank = 0;

	/* discover bank cmds */
	switch (idcode0) {
	case SPI_FLASH_SPANSION_IDCODE0:
		flash->bank_read_cmd = CMD_BANKADDR_BRRD;
		flash->bank_write_cmd = CMD_BANKADDR_BRWR;
		break;
	case SPI_FLASH_STMICRO_IDCODE0:
	case SPI_FLASH_WINBOND_IDCODE0:
		flash->bank_read_cmd = CMD_EXTNADDR_RDEAR;
		flash->bank_write_cmd = CMD_EXTNADDR_WREAR;
		break;
	default:
		printf("SF: Unsupported bank commands %02x\n", idcode0);
		return -1;
	}

	/* read the bank reg - on which bank the flash is in currently */
	cmd = flash->bank_read_cmd;
	if (flash->size > SPI_FLASH_16MB_BOUN) {
		if (spi_flash_read_common(flash, &cmd, 1, &curr_bank, 1)) {
			debug("SF: fail to read bank addr register\n");
			return -1;
		}
		flash->bank_curr = curr_bank;
	} else {
		flash->bank_curr = curr_bank;
	}

	return 0;
}
#endif

#ifdef CONFIG_OF_CONTROL
int spi_flash_decode_fdt(const void *blob, struct spi_flash *flash)
{
	fdt_addr_t addr;
	fdt_size_t size;
	int node;

	/* If there is no node, do nothing */
	node = fdtdec_next_compatible(blob, 0, COMPAT_GENERIC_SPI_FLASH);
	if (node < 0)
		return 0;

	addr = fdtdec_get_addr_size(blob, node, "memory-map", &size);
	if (addr == FDT_ADDR_T_NONE) {
		debug("%s: Cannot decode address\n", __func__);
		return 0;
	}

	if (flash->size != size) {
		debug("%s: Memory map must cover entire device\n", __func__);
		return -1;
	}
	flash->memory_map = (void *)addr;

	return 0;
}
#endif /* CONFIG_OF_CONTROL */

/*
 * The following table holds all device probe functions
 *
 * shift:  number of continuation bytes before the ID
 * idcode: the expected IDCODE or 0xff for non JEDEC devices
 * probe:  the function to call
 *
 * Non JEDEC devices should be ordered in the table such that
 * the probe functions with best detection algorithms come first.
 *
 * Several matching entries are permitted, they will be tried
 * in sequence until a probe function returns non NULL.
 *
 * IDCODE_CONT_LEN may be redefined if a device needs to declare a
 * larger "shift" value.  IDCODE_PART_LEN generally shouldn't be
 * changed.  This is the max number of bytes probe functions may
 * examine when looking up part-specific identification info.
 *
 * Probe functions will be given the idcode buffer starting at their
 * manu id byte (the "idcode" in the table below).  In other words,
 * all of the continuation bytes will be skipped (the "shift" below).
 */
#define IDCODE_CONT_LEN 0
#define IDCODE_PART_LEN 5
static const struct {
	const u8 shift;
	const u8 idcode;
	struct spi_flash *(*probe) (struct spi_slave *spi, u8 *idcode);
} flashes[] = {
	/* Keep it sorted by define name */
#ifdef CONFIG_SPI_FLASH_ATMEL
	{ 0, 0x1f, spi_flash_probe_atmel, },
#endif
#ifdef CONFIG_SPI_FLASH_EON
	{ 0, 0x1c, spi_flash_probe_eon, },
#endif
#ifdef CONFIG_SPI_FLASH_GIGADEVICE
	{ 0, 0xc8, spi_flash_probe_gigadevice, },
#endif
#ifdef CONFIG_SPI_FLASH_MACRONIX
	{ 0, 0xc2, spi_flash_probe_macronix, },
#endif
#ifdef CONFIG_SPI_FLASH_SPANSION
	{ 0, 0x01, spi_flash_probe_spansion, },
#endif
#ifdef CONFIG_SPI_FLASH_SST
	{ 0, 0xbf, spi_flash_probe_sst, },
#endif
#ifdef CONFIG_SPI_FLASH_STMICRO
	{ 0, 0x20, spi_flash_probe_stmicro, },
#endif
#ifdef CONFIG_SPI_FLASH_WINBOND
	{ 0, 0xef, spi_flash_probe_winbond, },
#endif
#ifdef CONFIG_SPI_FRAM_RAMTRON
	{ 6, 0xc2, spi_fram_probe_ramtron, },
# undef IDCODE_CONT_LEN
# define IDCODE_CONT_LEN 6
#endif
	/* Keep it sorted by best detection */
#ifdef CONFIG_SPI_FLASH_STMICRO
	{ 0, 0xff, spi_flash_probe_stmicro, },
#endif
#ifdef CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC
	{ 0, 0xff, spi_fram_probe_ramtron, },
#endif
};
#define IDCODE_LEN (IDCODE_CONT_LEN + IDCODE_PART_LEN)

struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
		unsigned int max_hz, unsigned int spi_mode)
{
	struct spi_slave *spi;
	struct spi_flash *flash = NULL;
	int ret, i, shift;
	u8 idcode[IDCODE_LEN], *idp;

	spi = spi_setup_slave(bus, cs, max_hz, spi_mode);
	if (!spi) {
		printf("SF: Failed to set up slave\n");
		return NULL;
	}

	ret = spi_claim_bus(spi);
	if (ret) {
		debug("SF: Failed to claim SPI bus: %d\n", ret);
		goto err_claim_bus;
	}

	/* Read the ID codes */
	ret = spi_flash_cmd(spi, CMD_READ_ID, idcode, sizeof(idcode));
	if (ret)
		goto err_read_id;

#ifdef DEBUG
	printf("SF: Got idcodes\n");
	print_buffer(0, idcode, 1, sizeof(idcode), 0);
#endif

	/* count the number of continuation bytes */
	for (shift = 0, idp = idcode;
	     shift < IDCODE_CONT_LEN && *idp == 0x7f;
	     ++shift, ++idp)
		continue;

	/* search the table for matches in shift and id */
	for (i = 0; i < ARRAY_SIZE(flashes); ++i)
		if (flashes[i].shift == shift && flashes[i].idcode == *idp) {
			/* we have a match, call probe */
			flash = flashes[i].probe(spi, idp);
			if (flash)
				break;
		}

	if (!flash) {
		printf("SF: Unsupported manufacturer %02x\n", *idp);
		goto err_manufacturer_probe;
	}

#ifdef CONFIG_SPI_FLASH_BAR
	/* Configure the BAR - disover bank cmds and read current bank  */
	ret = spi_flash_bank_config(flash, *idp);
	if (ret < 0)
		goto err_manufacturer_probe;
#endif

#ifdef CONFIG_OF_CONTROL
	if (spi_flash_decode_fdt(gd->fdt_blob, flash)) {
		debug("SF: FDT decode error\n");
		goto err_manufacturer_probe;
	}
#endif
#ifndef CONFIG_SPL_BUILD
	printf("SF: Detected %s with page size ", flash->name);
	print_size(flash->sector_size, ", total ");
	print_size(flash->size, "");
	if (flash->memory_map)
		printf(", mapped at %p", flash->memory_map);
	puts("\n");
#endif
#ifndef CONFIG_SPI_FLASH_BAR
	if (flash->size > SPI_FLASH_16MB_BOUN) {
		puts("SF: Warning - Only lower 16MiB accessible,");
		puts(" Full access #define CONFIG_SPI_FLASH_BAR\n");
	}
#endif

	spi_release_bus(spi);

	return flash;

err_manufacturer_probe:
err_read_id:
	spi_release_bus(spi);
err_claim_bus:
	spi_free_slave(spi);
	return NULL;
}

void *spi_flash_do_alloc(int offset, int size, struct spi_slave *spi,
			 const char *name)
{
	struct spi_flash *flash;
	void *ptr;

	ptr = malloc(size);
	if (!ptr) {
		debug("SF: Failed to allocate memory\n");
		return NULL;
	}
	memset(ptr, '\0', size);
	flash = (struct spi_flash *)(ptr + offset);

	/* Set up some basic fields - caller will sort out sizes */
	flash->spi = spi;
	flash->name = name;
	flash->poll_cmd = CMD_READ_STATUS;

	flash->read = spi_flash_cmd_read_fast;
	flash->write = spi_flash_cmd_write_multi;
	flash->erase = spi_flash_cmd_erase;

	return flash;
}

void spi_flash_free(struct spi_flash *flash)
{
	spi_free_slave(flash->spi);
	free(flash);
}