path: root/src/drivers/spi/winbond.c

/*
 * Copyright 2008, Network Appliance Inc.
 * Author: Jason McMullan <mcmullan <at> netapp.com>
 * Licensed under the GPL-2 or later.
 */

#include <console/console.h>
#include <stdlib.h>
#include <spi_flash.h>
#include <spi-generic.h>
#include <string.h>
#include <assert.h>

#include "spi_flash_internal.h"

/* M25Pxx-specific commands */
#define CMD_W25_WREN		0x06	/* Write Enable */
#define CMD_W25_WRDI		0x04	/* Write Disable */
#define CMD_W25_RDSR		0x05	/* Read Status Register */
#define CMD_W25_WRSR		0x01	/* Write Status Register */
#define CMD_W25_RDSR2		0x35	/* Read Status2 Register */
#define CMD_W25_WRSR2		0x31	/* Write Status2 Register */
#define CMD_W25_READ		0x03	/* Read Data Bytes */
#define CMD_W25_FAST_READ	0x0b	/* Read Data Bytes at Higher Speed */
#define CMD_W25_PP		0x02	/* Page Program */
#define CMD_W25_SE		0x20	/* Sector (4K) Erase */
#define CMD_W25_BE		0xd8	/* Block (64K) Erase */
#define CMD_W25_CE		0xc7	/* Chip Erase */
#define CMD_W25_DP		0xb9	/* Deep Power-down */
#define CMD_W25_RES		0xab	/* Release from DP, and Read Signature */

struct winbond_spi_flash_params {
	uint16_t id;
	uint8_t l2_page_size_shift;
	uint8_t pages_per_sector_shift : 4;
	uint8_t sectors_per_block_shift : 4;
	uint8_t nr_blocks_shift;
	uint8_t bp_bits : 3;
	uint8_t protection_granularity_shift : 5;
	char name[10];
};

union status_reg1_bp3 {
	uint8_t u;
	struct {
		uint8_t busy : 1;
		uint8_t wel  : 1;
		uint8_t bp   : 3;
		uint8_t tb   : 1;
		uint8_t sec  : 1;
		uint8_t srp0 : 1;
	};
};

union status_reg1_bp4 {
	uint8_t u;
	struct {
		uint8_t busy : 1;
		uint8_t wel  : 1;
		uint8_t bp   : 4;
		uint8_t tb   : 1;
		uint8_t srp0 : 1;
	};
};

union status_reg2 {
	uint8_t u;
	struct {
		uint8_t srp1 : 1;
		uint8_t   qe : 1;
		uint8_t  res : 1;
		uint8_t   lb : 3;
		uint8_t  cmp : 1;
		uint8_t  sus : 1;
	};
};

static const struct winbond_spi_flash_params winbond_spi_flash_table[] = {
	{
		.id				= 0x3015,
		.l2_page_size_shift		= 8,
		.pages_per_sector_shift		= 4,
		.sectors_per_block_shift	= 4,
		.nr_blocks_shift		= 5,
		.name				= "W25X16",
	},
	{
		.id				= 0x3016,
		.l2_page_size_shift		= 8,
		.pages_per_sector_shift		= 4,
		.sectors_per_block_shift	= 4,
		.nr_blocks_shift		= 6,
		.name				= "W25X32",
	},
	{
		.id				= 0x3017,
		.l2_page_size_shift		= 8,
		.pages_per_sector_shift		= 4,
		.sectors_per_block_shift	= 4,
		.nr_blocks_shift		= 7,
		.name				= "W25X64",
	},
	{
		.id				= 0x4014,
		.l2_page_size_shift		= 8,
		.pages_per_sector_shift		= 4,
		.sectors_per_block_shift	= 4,
		.nr_blocks_shift		= 4,
		.name				= "W25Q80",
	},
	{
		.id				= 0x4015,
		.l2_page_size_shift		= 8,
		.pages_per_sector_shift		= 4,
		.sectors_per_block_shift	= 4,
		.nr_blocks_shift		= 5,
		.name				= "W25Q16",
		.protection_granularity_shift	= 16,
		.bp_bits			= 3,
	},
	{
		.id				= 0x4016,
		.l2_page_size_shift		= 8,
		.pages_per_sector_shift		= 4,
		.sectors_per_block_shift	= 4,
		.nr_blocks_shift		= 6,
		.name				= "W25Q32",
		.protection_granularity_shift	= 16,
		.bp_bits			= 3,
	},
	{
		.id				= 0x6016,
		.l2_page_size_shift		= 8,
		.pages_per_sector_shift		= 4,
		.sectors_per_block_shift	= 4,
		.nr_blocks_shift		= 6,
		.name				= "W25Q32DW",
		.protection_granularity_shift	= 16,
		.bp_bits			= 3,
	},
	{
		.id				= 0x4017,
		.l2_page_size_shift		= 8,
		.pages_per_sector_shift		= 4,
		.sectors_per_block_shift	= 4,
		.nr_blocks_shift		= 7,
		.name				= "W25Q64",
		.protection_granularity_shift	= 17,
		.bp_bits			= 3,
	},
	{
		.id				= 0x6017,
		.l2_page_size_shift		= 8,
		.pages_per_sector_shift		= 4,
		.sectors_per_block_shift	= 4,
		.nr_blocks_shift		= 7,
		.name				= "W25Q64DW",
		.protection_granularity_shift	= 17,
		.bp_bits			= 3,
	},
	{
		.id				= 0x4018,
		.l2_page_size_shift		= 8,
		.pages_per_sector_shift		= 4,
		.sectors_per_block_shift	= 4,
		.nr_blocks_shift		= 8,
		.name				= "W25Q128",
		.protection_granularity_shift	= 18,
		.bp_bits			= 3,
	},
	{
		.id				= 0x6018,
		.l2_page_size_shift		= 8,
		.pages_per_sector_shift		= 4,
		.sectors_per_block_shift	= 4,
		.nr_blocks_shift		= 8,
		.name				= "W25Q128FW",
		.protection_granularity_shift	= 18,
		.bp_bits			= 3,
	},
	{
		.id				= 0x4019,
		.l2_page_size_shift		= 8,
		.pages_per_sector_shift		= 4,
		.sectors_per_block_shift	= 4,
		.nr_blocks_shift		= 9,
		.name				= "W25Q256",
		.protection_granularity_shift	= 16,
		.bp_bits			= 4,
	},
};

static int winbond_write(const struct spi_flash *flash, u32 offset, size_t len,
			const void *buf)
{
	unsigned long byte_addr;
	unsigned long page_size;
	size_t chunk_len;
	size_t actual;
	int ret = 0;
	u8 cmd[4];

	page_size = flash->page_size;

	for (actual = 0; actual < len; actual += chunk_len) {
		byte_addr = offset % page_size;
		chunk_len = min(len - actual, page_size - byte_addr);
		chunk_len = spi_crop_chunk(&flash->spi, sizeof(cmd), chunk_len);

		cmd[0] = CMD_W25_PP;
		cmd[1] = (offset >> 16) & 0xff;
		cmd[2] = (offset >> 8) & 0xff;
		cmd[3] = offset & 0xff;
#if IS_ENABLED(CONFIG_DEBUG_SPI_FLASH)
		printk(BIOS_SPEW, "PP: 0x%p => cmd = { 0x%02x 0x%02x%02x%02x }"
		        " chunk_len = %zu\n", buf + actual,
			cmd[0], cmd[1], cmd[2], cmd[3], chunk_len);
#endif

		ret = spi_flash_cmd(&flash->spi, CMD_W25_WREN, NULL, 0);
		if (ret < 0) {
			printk(BIOS_WARNING, "SF: Enabling Write failed\n");
			goto out;
		}

		ret = spi_flash_cmd_write(&flash->spi, cmd, sizeof(cmd),
				buf + actual, chunk_len);
		if (ret < 0) {
			printk(BIOS_WARNING, "SF: Winbond Page Program failed\n");
			goto out;
		}

		ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
		if (ret)
			goto out;

		offset += chunk_len;
	}

#if IS_ENABLED(CONFIG_DEBUG_SPI_FLASH)
	printk(BIOS_SPEW, "SF: Winbond: Successfully programmed %zu bytes @"
			" 0x%lx\n", len, (unsigned long)(offset - len));
#endif
	ret = 0;

out:
	return ret;
}

/*
 * Convert BPx, TB and CMP to a region.
 * SEC (if available) must be zero.
 */
static void winbond_bpbits_to_region(const size_t granularity,
				     const u8 bp,
				     bool tb,
				     const bool cmp,
				     const size_t flash_size,
				     struct region *out)
{
	size_t protected_size =
		min(bp ? granularity << (bp - 1) : 0, flash_size);

	if (cmp) {
		protected_size = flash_size - protected_size;
		tb = !tb;
	}

	out->offset = tb ? flash_size - protected_size : 0;
	out->size = protected_size;
}

/*
 * Available on all devices.
 * Read block protect bits from Status/Status2 Reg.
 * Converts block protection bits to a region.
 *
 * Returns:
 * -1    on error
 *  1    if region is covered by write protection
 *  0    if a part of region isn't covered by write protection
 */
static int winbond_get_write_protection(const struct spi_flash *flash,
					const struct region *region)
{
	const struct winbond_spi_flash_params *params;
	struct region wp_region;
	union status_reg2 reg2;
	u8 bp, tb;
	int ret;

	params = (const struct winbond_spi_flash_params *)flash->driver_private;
	const size_t granularity = (1 << params->protection_granularity_shift);

	if (params->bp_bits == 3) {
		union status_reg1_bp3 reg1_bp3;

		ret = spi_flash_cmd(&flash->spi, flash->status_cmd, &reg1_bp3.u,
				    sizeof(reg1_bp3.u));
		if (ret)
			return ret;

		if (reg1_bp3.sec) {
			// FIXME: not supported
			return -1;
		}

		bp = reg1_bp3.bp;
		tb = reg1_bp3.tb;
	} else if (params->bp_bits == 4) {
		union status_reg1_bp4 reg1_bp4;

		ret = spi_flash_cmd(&flash->spi, flash->status_cmd, &reg1_bp4.u,
				    sizeof(reg1_bp4.u));
		if (ret)
			return ret;

		bp = reg1_bp4.bp;
		tb = reg1_bp4.tb;
	} else {
		// FIXME: not supported
		return -1;
	}

	ret = spi_flash_cmd(&flash->spi, CMD_W25_RDSR2, &reg2.u,
			    sizeof(reg2.u));
	if (ret)
		return ret;

	winbond_bpbits_to_region(granularity, bp, tb, reg2.cmp, flash->size,
				 &wp_region);

	if (!reg2.srp1 || !wp_region.size) {
		printk(BIOS_DEBUG, "WINBOND: flash isn't protected\n");

		return 0;
	}

	printk(BIOS_DEBUG, "WINBOND: flash protected range 0x%08zx-0x%08zx\n",
	       wp_region.offset, wp_region.size);

	return region_is_subregion(&wp_region, region);
}


static const struct spi_flash_ops spi_flash_ops = {
	.write = winbond_write,
	.erase = spi_flash_cmd_erase,
	.status = spi_flash_cmd_status,
#if IS_ENABLED(CONFIG_SPI_FLASH_NO_FAST_READ)
	.read = spi_flash_cmd_read_slow,
#else
	.read = spi_flash_cmd_read_fast,
#endif
	.get_write_protection = winbond_get_write_protection,
};

int spi_flash_probe_winbond(const struct spi_slave *spi, u8 *idcode,
			    struct spi_flash *flash)
{
	const struct winbond_spi_flash_params *params;
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(winbond_spi_flash_table); i++) {
		params = &winbond_spi_flash_table[i];
		if (params->id == ((idcode[1] << 8) | idcode[2]))
			break;
	}

	if (i == ARRAY_SIZE(winbond_spi_flash_table)) {
		printk(BIOS_WARNING, "SF: Unsupported Winbond ID %02x%02x\n",
				idcode[1], idcode[2]);
		return -1;
	}

	memcpy(&flash->spi, spi, sizeof(*spi));
	flash->name = params->name;

	/* Params are in power-of-two. */
	flash->page_size = 1 << params->l2_page_size_shift;
	flash->sector_size = flash->page_size *
			(1 << params->pages_per_sector_shift);
	flash->size = flash->sector_size *
			(1 << params->sectors_per_block_shift) *
			(1 << params->nr_blocks_shift);
	flash->erase_cmd = CMD_W25_SE;
	flash->status_cmd = CMD_W25_RDSR;

	flash->ops = &spi_flash_ops;
	flash->driver_private = params;

	return 0;
}