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Diffstat (limited to 'nuttx/drivers/mtd/w25.c')
| -rw-r--r-- | nuttx/drivers/mtd/w25.c | 1179 |
1 files changed, 0 insertions, 1179 deletions
diff --git a/nuttx/drivers/mtd/w25.c b/nuttx/drivers/mtd/w25.c deleted file mode 100644 index bd6680fdf..000000000 --- a/nuttx/drivers/mtd/w25.c +++ /dev/null @@ -1,1179 +0,0 @@ -/************************************************************************************ - * drivers/mtd/w25.c - * Driver for SPI-based W25x16, x32, and x64 and W25q16, q32, q64, and q128 FLASH - * - * Copyright (C) 2012 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <gnutt@nuttx.org> - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * 3. Neither the name NuttX nor the names of its contributors may be - * used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS - * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE - * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, - * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS - * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED - * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN - * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - * - ************************************************************************************/ - -/************************************************************************************ - * Included Files - ************************************************************************************/ - -#include <nuttx/config.h> - -#include <sys/types.h> - -#include <stdint.h> -#include <stdbool.h> -#include <stdlib.h> -#include <unistd.h> -#include <string.h> -#include <assert.h> -#include <errno.h> -#include <debug.h> - -#include <nuttx/kmalloc.h> -#include <nuttx/fs/ioctl.h> -#include <nuttx/spi.h> -#include <nuttx/mtd.h> - -/************************************************************************************ - * Pre-processor Definitions - ************************************************************************************/ -/* Configuration ********************************************************************/ -/* Per the data sheet, the W25 parts can be driven with either SPI mode 0 (CPOL=0 - * and CPHA=0) or mode 3 (CPOL=1 and CPHA=1). But I have heard that other devices - * can operate in mode 0 or 1. So you may need to specify CONFIG_W25_SPIMODE to - * select the best mode for your device. If CONFIG_W25_SPIMODE is not defined, - * mode 0 will be used. - */ - -#ifndef CONFIG_W25_SPIMODE -# define CONFIG_W25_SPIMODE SPIDEV_MODE0 -#endif - -/* SPI Frequency. May be up to 25MHz. */ - -#ifndef CONFIG_W25_SPIFREQUENCY -# define CONFIG_W25_SPIFREQUENCY 20000000 -#endif - -/* W25 Instructions *****************************************************************/ -/* Command Value Description */ -/* */ -#define W25_WREN 0x06 /* Write enable */ -#define W25_WRDI 0x04 /* Write Disable */ -#define W25_RDSR 0x05 /* Read status register */ -#define W25_WRSR 0x01 /* Write Status Register */ -#define W25_RDDATA 0x03 /* Read data bytes */ -#define W25_FRD 0x0b /* Higher speed read */ -#define W25_FRDD 0x3b /* Fast read, dual output */ -#define W25_PP 0x02 /* Program page */ -#define W25_BE 0xd8 /* Block Erase (64KB) */ -#define W25_SE 0x20 /* Sector erase (4KB) */ -#define W25_CE 0xc7 /* Chip erase */ -#define W25_PD 0xb9 /* Power down */ -#define W25_PURDID 0xab /* Release PD, Device ID */ -#define W25_RDMFID 0x90 /* Read Manufacturer / Device */ -#define W25_JEDEC_ID 0x9f /* JEDEC ID read */ - -/* W25 Registers ********************************************************************/ -/* Read ID (RDID) register values */ - -#define W25_MANUFACTURER 0xef /* Winbond Serial Flash */ -#define W25X16_DEVID 0x14 /* W25X16 device ID (0xab, 0x90) */ -#define W25X32_DEVID 0x15 /* W25X16 device ID (0xab, 0x90) */ -#define W25X64_DEVID 0x16 /* W25X16 device ID (0xab, 0x90) */ - -/* JEDEC Read ID register values */ - -#define W25_JEDEC_MANUFACTURER 0xef /* SST manufacturer ID */ -#define W25X_JEDEC_MEMORY_TYPE 0x30 /* W25X memory type */ -#define W25Q_JEDEC_MEMORY_TYPE_A 0x40 /* W25Q memory type */ -#define W25Q_JEDEC_MEMORY_TYPE_B 0x60 /* W25Q memory type */ - -#define W25_JEDEC_CAPACITY_16MBIT 0x15 /* 512x4096 = 16Mbit memory capacity */ -#define W25_JEDEC_CAPACITY_32MBIT 0x16 /* 1024x4096 = 32Mbit memory capacity */ -#define W25_JEDEC_CAPACITY_64MBIT 0x17 /* 2048x4096 = 64Mbit memory capacity */ -#define W25_JEDEC_CAPACITY_128MBIT 0x18 /* 4096x4096 = 128Mbit memory capacity */ - -#define NSECTORS_16MBIT 512 /* 512 sectors x 4096 bytes/sector = 2Mb */ -#define NSECTORS_32MBIT 1024 /* 1024 sectors x 4096 bytes/sector = 4Mb */ -#define NSECTORS_64MBIT 2048 /* 2048 sectors x 4096 bytes/sector = 8Mb */ -#define NSECTORS_128MBIT 4096 /* 4096 sectors x 4096 bytes/sector = 16Mb */ - -/* Status register bit definitions */ - -#define W25_SR_BUSY (1 << 0) /* Bit 0: Write in progress */ -#define W25_SR_WEL (1 << 1) /* Bit 1: Write enable latch bit */ -#define W25_SR_BP_SHIFT (2) /* Bits 2-5: Block protect bits */ -#define W25_SR_BP_MASK (15 << W25_SR_BP_SHIFT) -# define W25X16_SR_BP_NONE (0 << W25_SR_BP_SHIFT) /* Unprotected */ -# define W25X16_SR_BP_UPPER32nd (1 << W25_SR_BP_SHIFT) /* Upper 32nd */ -# define W25X16_SR_BP_UPPER16th (2 << W25_SR_BP_SHIFT) /* Upper 16th */ -# define W25X16_SR_BP_UPPER8th (3 << W25_SR_BP_SHIFT) /* Upper 8th */ -# define W25X16_SR_BP_UPPERQTR (4 << W25_SR_BP_SHIFT) /* Upper quarter */ -# define W25X16_SR_BP_UPPERHALF (5 << W25_SR_BP_SHIFT) /* Upper half */ -# define W25X16_SR_BP_ALL (6 << W25_SR_BP_SHIFT) /* All sectors */ -# define W25X16_SR_BP_LOWER32nd (9 << W25_SR_BP_SHIFT) /* Lower 32nd */ -# define W25X16_SR_BP_LOWER16th (10 << W25_SR_BP_SHIFT) /* Lower 16th */ -# define W25X16_SR_BP_LOWER8th (11 << W25_SR_BP_SHIFT) /* Lower 8th */ -# define W25X16_SR_BP_LOWERQTR (12 << W25_SR_BP_SHIFT) /* Lower quarter */ -# define W25X16_SR_BP_LOWERHALF (13 << W25_SR_BP_SHIFT) /* Lower half */ - -# define W25X32_SR_BP_NONE (0 << W25_SR_BP_SHIFT) /* Unprotected */ -# define W25X32_SR_BP_UPPER64th (1 << W25_SR_BP_SHIFT) /* Upper 64th */ -# define W25X32_SR_BP_UPPER32nd (2 << W25_SR_BP_SHIFT) /* Upper 32nd */ -# define W25X32_SR_BP_UPPER16th (3 << W25_SR_BP_SHIFT) /* Upper 16th */ -# define W25X32_SR_BP_UPPER8th (4 << W25_SR_BP_SHIFT) /* Upper 8th */ -# define W25X32_SR_BP_UPPERQTR (5 << W25_SR_BP_SHIFT) /* Upper quarter */ -# define W25X32_SR_BP_UPPERHALF (6 << W25_SR_BP_SHIFT) /* Upper half */ -# define W25X32_SR_BP_ALL (7 << W25_SR_BP_SHIFT) /* All sectors */ -# define W25X32_SR_BP_LOWER64th (9 << W25_SR_BP_SHIFT) /* Lower 64th */ -# define W25X32_SR_BP_LOWER32nd (10 << W25_SR_BP_SHIFT) /* Lower 32nd */ -# define W25X32_SR_BP_LOWER16th (11 << W25_SR_BP_SHIFT) /* Lower 16th */ -# define W25X32_SR_BP_LOWER8th (12 << W25_SR_BP_SHIFT) /* Lower 8th */ -# define W25X32_SR_BP_LOWERQTR (13 << W25_SR_BP_SHIFT) /* Lower quarter */ -# define W25X32_SR_BP_LOWERHALF (14 << W25_SR_BP_SHIFT) /* Lower half */ - -# define W25X64_SR_BP_NONE (0 << W25_SR_BP_SHIFT) /* Unprotected */ -# define W25X64_SR_BP_UPPER64th (1 << W25_SR_BP_SHIFT) /* Upper 64th */ -# define W25X64_SR_BP_UPPER32nd (2 << W25_SR_BP_SHIFT) /* Upper 32nd */ -# define W25X64_SR_BP_UPPER16th (3 << W25_SR_BP_SHIFT) /* Upper 16th */ -# define W25X64_SR_BP_UPPER8th (4 << W25_SR_BP_SHIFT) /* Upper 8th */ -# define W25X64_SR_BP_UPPERQTR (5 << W25_SR_BP_SHIFT) /* Upper quarter */ -# define W25X64_SR_BP_UPPERHALF (6 << W25_SR_BP_SHIFT) /* Upper half */ -# define W25X46_SR_BP_ALL (7 << W25_SR_BP_SHIFT) /* All sectors */ -# define W25X64_SR_BP_LOWER64th (9 << W25_SR_BP_SHIFT) /* Lower 64th */ -# define W25X64_SR_BP_LOWER32nd (10 << W25_SR_BP_SHIFT) /* Lower 32nd */ -# define W25X64_SR_BP_LOWER16th (11 << W25_SR_BP_SHIFT) /* Lower 16th */ -# define W25X64_SR_BP_LOWER8th (12 << W25_SR_BP_SHIFT) /* Lower 8th */ -# define W25X64_SR_BP_LOWERQTR (13 << W25_SR_BP_SHIFT) /* Lower quarter */ -# define W25X64_SR_BP_LOWERHALF (14 << W25_SR_BP_SHIFT) /* Lower half */ - /* Bit 6: Reserved */ -#define W25_SR_SRP (1 << 7) /* Bit 7: Status register write protect */ - -#define W25_DUMMY 0xa5 - -/* Chip Geometries ******************************************************************/ -/* All members of the family support uniform 4K-byte sectors and 256 byte pages */ - -#define W25_SECTOR_SHIFT 12 /* Sector size 1 << 12 = 4Kb */ -#define W25_SECTOR_SIZE (1 << 12) /* Sector size 1 << 12 = 4Kb */ -#define W25_PAGE_SHIFT 8 /* Sector size 1 << 8 = 256b */ -#define W25_PAGE_SIZE (1 << 8) /* Sector size 1 << 8 = 256b */ - -#ifdef CONFIG_W25_SECTOR512 /* Simulate a 512 byte sector */ -# define W25_SECTOR512_SHIFT 9 /* Sector size 1 << 9 = 512 bytes */ -# define W25_SECTOR512_SIZE (1 << 9) /* Sector size 1 << 9 = 512 bytes */ -#endif - -#define W25_ERASED_STATE 0xff /* State of FLASH when erased */ - -/* Cache flags */ - -#define W25_CACHE_VALID (1 << 0) /* 1=Cache has valid data */ -#define W25_CACHE_DIRTY (1 << 1) /* 1=Cache is dirty */ -#define W25_CACHE_ERASED (1 << 2) /* 1=Backing FLASH is erased */ - -#define IS_VALID(p) ((((p)->flags) & W25_CACHE_VALID) != 0) -#define IS_DIRTY(p) ((((p)->flags) & W25_CACHE_DIRTY) != 0) -#define IS_ERASED(p) ((((p)->flags) & W25_CACHE_DIRTY) != 0) - -#define SET_VALID(p) do { (p)->flags |= W25_CACHE_VALID; } while (0) -#define SET_DIRTY(p) do { (p)->flags |= W25_CACHE_DIRTY; } while (0) -#define SET_ERASED(p) do { (p)->flags |= W25_CACHE_DIRTY; } while (0) - -#define CLR_VALID(p) do { (p)->flags &= ~W25_CACHE_VALID; } while (0) -#define CLR_DIRTY(p) do { (p)->flags &= ~W25_CACHE_DIRTY; } while (0) -#define CLR_ERASED(p) do { (p)->flags &= ~W25_CACHE_DIRTY; } while (0) - -/************************************************************************************ - * Private Types - ************************************************************************************/ - -/* This type represents the state of the MTD device. The struct mtd_dev_s must - * appear at the beginning of the definition so that you can freely cast between - * pointers to struct mtd_dev_s and struct w25_dev_s. - */ - -struct w25_dev_s -{ - struct mtd_dev_s mtd; /* MTD interface */ - FAR struct spi_dev_s *spi; /* Saved SPI interface instance */ - uint16_t nsectors; /* Number of erase sectors */ - -#if defined(CONFIG_W25_SECTOR512) && !defined(CONFIG_W25_READONLY) - uint8_t flags; /* Buffered sector flags */ - uint16_t esectno; /* Erase sector number in the cache*/ - FAR uint8_t *sector; /* Allocated sector data */ -#endif -}; - -/************************************************************************************ - * Private Function Prototypes - ************************************************************************************/ - -/* Helpers */ - -static void w25_lock(FAR struct spi_dev_s *spi); -static inline void w25_unlock(FAR struct spi_dev_s *spi); -static inline int w25_readid(FAR struct w25_dev_s *priv); -#ifndef CONFIG_W25_READONLY -static void w25_unprotect(FAR struct w25_dev_s *priv); -#endif -static uint8_t w25_waitwritecomplete(FAR struct w25_dev_s *priv); -static inline void w25_wren(FAR struct w25_dev_s *priv); -static inline void w25_wrdi(FAR struct w25_dev_s *priv); -static void w25_sectorerase(FAR struct w25_dev_s *priv, off_t offset); -static inline int w25_chiperase(FAR struct w25_dev_s *priv); -static void w25_byteread(FAR struct w25_dev_s *priv, FAR uint8_t *buffer, - off_t address, size_t nbytes); -#ifndef CONFIG_W25_READONLY -static void w25_pagewrite(FAR struct w25_dev_s *priv, FAR const uint8_t *buffer, - off_t address, size_t nbytes); -#endif -#ifdef CONFIG_W25_SECTOR512 -static void w25_cacheflush(struct w25_dev_s *priv); -static FAR uint8_t *w25_cacheread(struct w25_dev_s *priv, off_t sector); -static void w25_cacheerase(struct w25_dev_s *priv, off_t sector); -static void w25_cachewrite(FAR struct w25_dev_s *priv, FAR const uint8_t *buffer, - off_t sector, size_t nsectors); -#endif - -/* MTD driver methods */ - -static int w25_erase(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks); -static ssize_t w25_bread(FAR struct mtd_dev_s *dev, off_t startblock, - size_t nblocks, FAR uint8_t *buf); -static ssize_t w25_bwrite(FAR struct mtd_dev_s *dev, off_t startblock, - size_t nblocks, FAR const uint8_t *buf); -static ssize_t w25_read(FAR struct mtd_dev_s *dev, off_t offset, size_t nbytes, - FAR uint8_t *buffer); -static int w25_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg); - -/************************************************************************************ - * Private Data - ************************************************************************************/ - -/************************************************************************************ - * Private Functions - ************************************************************************************/ - -/************************************************************************************ - * Name: w25_lock - ************************************************************************************/ - -static void w25_lock(FAR struct spi_dev_s *spi) -{ - /* On SPI busses where there are multiple devices, it will be necessary to - * lock SPI to have exclusive access to the busses for a sequence of - * transfers. The bus should be locked before the chip is selected. - * - * This is a blocking call and will not return until we have exclusiv access to - * the SPI buss. We will retain that exclusive access until the bus is unlocked. - */ - - (void)SPI_LOCK(spi, true); - - /* After locking the SPI bus, the we also need call the setfrequency, setbits, and - * setmode methods to make sure that the SPI is properly configured for the device. - * If the SPI buss is being shared, then it may have been left in an incompatible - * state. - */ - - SPI_SETMODE(spi, CONFIG_W25_SPIMODE); - SPI_SETBITS(spi, 8); - (void)SPI_SETFREQUENCY(spi, CONFIG_W25_SPIFREQUENCY); -} - -/************************************************************************************ - * Name: w25_unlock - ************************************************************************************/ - -static inline void w25_unlock(FAR struct spi_dev_s *spi) -{ - (void)SPI_LOCK(spi, false); -} - -/************************************************************************************ - * Name: w25_readid - ************************************************************************************/ - -static inline int w25_readid(struct w25_dev_s *priv) -{ - uint16_t manufacturer; - uint16_t memory; - uint16_t capacity; - - fvdbg("priv: %p\n", priv); - - /* Lock the SPI bus, configure the bus, and select this FLASH part. */ - - w25_lock(priv->spi); - SPI_SELECT(priv->spi, SPIDEV_FLASH, true); - - /* Send the "Read ID (RDID)" command and read the first three ID bytes */ - - (void)SPI_SEND(priv->spi, W25_JEDEC_ID); - manufacturer = SPI_SEND(priv->spi, W25_DUMMY); - memory = SPI_SEND(priv->spi, W25_DUMMY); - capacity = SPI_SEND(priv->spi, W25_DUMMY); - - /* Deselect the FLASH and unlock the bus */ - - SPI_SELECT(priv->spi, SPIDEV_FLASH, false); - w25_unlock(priv->spi); - - fvdbg("manufacturer: %02x memory: %02x capacity: %02x\n", - manufacturer, memory, capacity); - - /* Check for a valid manufacturer and memory type */ - - if (manufacturer == W25_JEDEC_MANUFACTURER && - (memory == W25X_JEDEC_MEMORY_TYPE || - memory == W25Q_JEDEC_MEMORY_TYPE_A || - memory == W25Q_JEDEC_MEMORY_TYPE_B)) - { - /* Okay.. is it a FLASH capacity that we understand? If so, save - * the FLASH capacity. - */ - - /* 16M-bit / 2M-byte (2,097,152) - * - * W24X16, W25Q16BV, W25Q16CL, W25Q16CV, W25Q16DW - */ - - if (capacity == W25_JEDEC_CAPACITY_16MBIT) - { - priv->nsectors = NSECTORS_16MBIT; - } - - /* 32M-bit / M-byte (4,194,304) - * - * W25X32, W25Q32BV, W25Q32DW - */ - - else if (capacity == W25_JEDEC_CAPACITY_32MBIT) - { - priv->nsectors = NSECTORS_32MBIT; - } - - /* 64M-bit / 8M-byte (8,388,608) - * - * W25X64, W25Q64BV, W25Q64CV, W25Q64DW - */ - - else if (capacity == W25_JEDEC_CAPACITY_64MBIT) - { - priv->nsectors = NSECTORS_64MBIT; - } - - /* 128M-bit / 16M-byte (16,777,216) - * - * W25Q128BV - */ - - else if (capacity == W25_JEDEC_CAPACITY_128MBIT) - { - priv->nsectors = NSECTORS_128MBIT; - } - else - { - /* Nope.. we don't understand this capacity. */ - - return -ENODEV; - } - - return OK; - } - - /* We don't understand the manufacturer or the memory type */ - - return -ENODEV; -} - -/************************************************************************************ - * Name: w25_unprotect - ************************************************************************************/ - -#ifndef CONFIG_W25_READONLY -static void w25_unprotect(FAR struct w25_dev_s *priv) -{ - /* Select this FLASH part */ - - SPI_SELECT(priv->spi, SPIDEV_FLASH, true); - - /* Send "Write enable (WREN)" */ - - w25_wren(priv); - - /* Re-select this FLASH part (This might not be necessary... but is it shown in - * the SST25 timing diagrams from which this code was leveraged.) - */ - - SPI_SELECT(priv->spi, SPIDEV_FLASH, false); - SPI_SELECT(priv->spi, SPIDEV_FLASH, true); - - /* Send "Write enable status (EWSR)" */ - - SPI_SEND(priv->spi, W25_WRSR); - - /* Following by the new status value */ - - SPI_SEND(priv->spi, 0); - SPI_SEND(priv->spi, 0); -} -#endif - -/************************************************************************************ - * Name: w25_waitwritecomplete - ************************************************************************************/ - -static uint8_t w25_waitwritecomplete(struct w25_dev_s *priv) -{ - uint8_t status; - - /* Are we the only device on the bus? */ - -#ifdef CONFIG_SPI_OWNBUS - - /* Select this FLASH part */ - - SPI_SELECT(priv->spi, SPIDEV_FLASH, true); - - /* Send "Read Status Register (RDSR)" command */ - - (void)SPI_SEND(priv->spi, W25_RDSR); - - /* Loop as long as the memory is busy with a write cycle */ - - do - { - /* Send a dummy byte to generate the clock needed to shift out the status */ - - status = SPI_SEND(priv->spi, W25_DUMMY); - } - while ((status & W25_SR_BUSY) != 0); - - /* Deselect the FLASH */ - - SPI_SELECT(priv->spi, SPIDEV_FLASH, false); - -#else - - /* Loop as long as the memory is busy with a write cycle */ - - do - { - /* Select this FLASH part */ - - SPI_SELECT(priv->spi, SPIDEV_FLASH, true); - - /* Send "Read Status Register (RDSR)" command */ - - (void)SPI_SEND(priv->spi, W25_RDSR); - - /* Send a dummy byte to generate the clock needed to shift out the status */ - - status = SPI_SEND(priv->spi, W25_DUMMY); - - /* Deselect the FLASH */ - - SPI_SELECT(priv->spi, SPIDEV_FLASH, false); - - /* Given that writing could take up to few tens of milliseconds, and erasing - * could take more. The following short delay in the "busy" case will allow - * other peripherals to access the SPI bus. - */ - -#if 0 /* Makes writes too slow */ - if ((status & W25_SR_BUSY) != 0) - { - w25_unlock(priv->spi); - usleep(1000); - w25_lock(priv->spi); - } -#endif - } - while ((status & W25_SR_BUSY) != 0); -#endif - - return status; -} - -/************************************************************************************ - * Name: w25_wren - ************************************************************************************/ - -static inline void w25_wren(struct w25_dev_s *priv) -{ - /* Select this FLASH part */ - - SPI_SELECT(priv->spi, SPIDEV_FLASH, true); - - /* Send "Write Enable (WREN)" command */ - - (void)SPI_SEND(priv->spi, W25_WREN); - - /* Deselect the FLASH */ - - SPI_SELECT(priv->spi, SPIDEV_FLASH, false); -} - -/************************************************************************************ - * Name: w25_wrdi - ************************************************************************************/ - -static inline void w25_wrdi(struct w25_dev_s *priv) -{ - /* Select this FLASH part */ - - SPI_SELECT(priv->spi, SPIDEV_FLASH, true); - - /* Send "Write Disable (WRDI)" command */ - - (void)SPI_SEND(priv->spi, W25_WRDI); - - /* Deselect the FLASH */ - - SPI_SELECT(priv->spi, SPIDEV_FLASH, false); -} - -/************************************************************************************ - * Name: w25_sectorerase - ************************************************************************************/ - -static void w25_sectorerase(struct w25_dev_s *priv, off_t sector) -{ - off_t address = sector << W25_SECTOR_SHIFT; - - fvdbg("sector: %08lx\n", (long)sector); - - /* Wait for any preceding write or erase operation to complete. */ - - (void)w25_waitwritecomplete(priv); - - /* Send write enable instruction */ - - w25_wren(priv); - - /* Select this FLASH part */ - - SPI_SELECT(priv->spi, SPIDEV_FLASH, true); - - /* Send the "Sector Erase (SE)" instruction */ - - (void)SPI_SEND(priv->spi, W25_SE); - - /* Send the sector address high byte first. Only the most significant bits (those - * corresponding to the sector) have any meaning. - */ - - (void)SPI_SEND(priv->spi, (address >> 16) & 0xff); - (void)SPI_SEND(priv->spi, (address >> 8) & 0xff); - (void)SPI_SEND(priv->spi, address & 0xff); - - /* Deselect the FLASH */ - - SPI_SELECT(priv->spi, SPIDEV_FLASH, false); -} - -/************************************************************************************ - * Name: w25_chiperase - ************************************************************************************/ - -static inline int w25_chiperase(struct w25_dev_s *priv) -{ - fvdbg("priv: %p\n", priv); - - /* Wait for any preceding write or erase operation to complete. */ - - (void)w25_waitwritecomplete(priv); - - /* Send write enable instruction */ - - w25_wren(priv); - - /* Select this FLASH part */ - - SPI_SELECT(priv->spi, SPIDEV_FLASH, true); - - /* Send the "Chip Erase (CE)" instruction */ - - (void)SPI_SEND(priv->spi, W25_CE); - - /* Deselect the FLASH */ - - SPI_SELECT(priv->spi, SPIDEV_FLASH, false); - fvdbg("Return: OK\n"); - return OK; -} - -/************************************************************************************ - * Name: w25_byteread - ************************************************************************************/ - -static void w25_byteread(FAR struct w25_dev_s *priv, FAR uint8_t *buffer, - off_t address, size_t nbytes) -{ - uint8_t status; - - fvdbg("address: %08lx nbytes: %d\n", (long)address, (int)nbytes); - - /* Wait for any preceding write or erase operation to complete. */ - - status = w25_waitwritecomplete(priv); - DEBUGASSERT((status & (W25_SR_WEL|W25_SR_BP_MASK)) == 0); - - /* Make sure that writing is disabled */ - - w25_wrdi(priv); - - /* Select this FLASH part */ - - SPI_SELECT(priv->spi, SPIDEV_FLASH, true); - - /* Send "Read from Memory " instruction */ - -#ifdef CONFIG_W25_SLOWREAD - (void)SPI_SEND(priv->spi, W25_RDDATA); -#else - (void)SPI_SEND(priv->spi, W25_FRD); -#endif - - /* Send the address high byte first. */ - - (void)SPI_SEND(priv->spi, (address >> 16) & 0xff); - (void)SPI_SEND(priv->spi, (address >> 8) & 0xff); - (void)SPI_SEND(priv->spi, address & 0xff); - - /* Send a dummy byte */ - -#ifndef CONFIG_W25_SLOWREAD - (void)SPI_SEND(priv->spi, W25_DUMMY); -#endif - - /* Then read all of the requested bytes */ - - SPI_RECVBLOCK(priv->spi, buffer, nbytes); - - /* Deselect the FLASH */ - - SPI_SELECT(priv->spi, SPIDEV_FLASH, false); -} - -/************************************************************************************ - * Name: w25_pagewrite - ************************************************************************************/ - -#ifndef CONFIG_W25_READONLY -static void w25_pagewrite(struct w25_dev_s *priv, FAR const uint8_t *buffer, - off_t address, size_t nbytes) -{ - uint8_t status; - - fvdbg("address: %08lx nwords: %d\n", (long)address, (int)nbytes); - DEBUGASSERT(priv && buffer && (address & 0xff) == 0 && - (nbytes & 0xff) == 0); - - for (; nbytes > 0; nbytes -= W25_PAGE_SIZE) - { - /* Wait for any preceding write or erase operation to complete. */ - - status = w25_waitwritecomplete(priv); - DEBUGASSERT((status & (W25_SR_WEL|W25_SR_BP_MASK)) == 0); - - /* Enable write access to the FLASH */ - - w25_wren(priv); - - /* Select this FLASH part */ - - SPI_SELECT(priv->spi, SPIDEV_FLASH, true); - - /* Send the "Page Program (W25_PP)" Command */ - - SPI_SEND(priv->spi, W25_PP); - - /* Send the address high byte first. */ - - (void)SPI_SEND(priv->spi, (address >> 16) & 0xff); - (void)SPI_SEND(priv->spi, (address >> 8) & 0xff); - (void)SPI_SEND(priv->spi, address & 0xff); - - /* Then send the page of data */ - - SPI_SNDBLOCK(priv->spi, buffer, W25_PAGE_SIZE); - - /* Deselect the FLASH and setup for the next pass through the loop */ - - SPI_SELECT(priv->spi, SPIDEV_FLASH, false); - - /* Update addresses */ - - address += W25_PAGE_SIZE; - buffer += W25_PAGE_SIZE; - } - - /* Disable writing */ - - w25_wrdi(priv); -} -#endif - -/************************************************************************************ - * Name: w25_cacheflush - ************************************************************************************/ - -#if defined(CONFIG_W25_SECTOR512) && !defined(CONFIG_W25_READONLY) -static void w25_cacheflush(struct w25_dev_s *priv) -{ - /* If the cached is dirty (meaning that it no longer matches the old FLASH contents) - * or was erased (with the cache containing the correct FLASH contents), then write - * the cached erase block to FLASH. - */ - - if (IS_DIRTY(priv) || IS_ERASED(priv)) - { - /* Write entire erase block to FLASH */ - - w25_pagewrite(priv, priv->sector, (off_t)priv->esectno << W25_SECTOR_SHIFT, - W25_SECTOR_SIZE); - - /* The case is no long dirty and the FLASH is no longer erased */ - - CLR_DIRTY(priv); - CLR_ERASED(priv); - } -} -#endif - -/************************************************************************************ - * Name: w25_cacheread - ************************************************************************************/ - -#if defined(CONFIG_W25_SECTOR512) && !defined(CONFIG_W25_READONLY) -static FAR uint8_t *w25_cacheread(struct w25_dev_s *priv, off_t sector) -{ - off_t esectno; - int shift; - int index; - - /* Convert from the 512 byte sector to the erase sector size of the device. For - * exmample, if the actual erase sector size if 4Kb (1 << 12), then we first - * shift to the right by 3 to get the sector number in 4096 increments. - */ - - shift = W25_SECTOR_SHIFT - W25_SECTOR512_SHIFT; - esectno = sector >> shift; - fvdbg("sector: %ld esectno: %d shift=%d\n", sector, esectno, shift); - - /* Check if the requested erase block is already in the cache */ - - if (!IS_VALID(priv) || esectno != priv->esectno) - { - /* No.. Flush any dirty erase block currently in the cache */ - - w25_cacheflush(priv); - - /* Read the erase block into the cache */ - - w25_byteread(priv, priv->sector, (esectno << W25_SECTOR_SHIFT), W25_SECTOR_SIZE); - - /* Mark the sector as cached */ - - priv->esectno = esectno; - - SET_VALID(priv); /* The data in the cache is valid */ - CLR_DIRTY(priv); /* It should match the FLASH contents */ - CLR_ERASED(priv); /* The underlying FLASH has not been erased */ - } - - /* Get the index to the 512 sector in the erase block that holds the argument */ - - index = sector & ((1 << shift) - 1); - - /* Return the address in the cache that holds this sector */ - - return &priv->sector[index << W25_SECTOR512_SHIFT]; -} -#endif - -/************************************************************************************ - * Name: w25_cacheerase - ************************************************************************************/ - -#if defined(CONFIG_W25_SECTOR512) && !defined(CONFIG_W25_READONLY) -static void w25_cacheerase(struct w25_dev_s *priv, off_t sector) -{ - FAR uint8_t *dest; - - /* First, make sure that the erase block containing the 512 byte sector is in - * the cache. - */ - - dest = w25_cacheread(priv, sector); - - /* Erase the block containing this sector if it is not already erased. - * The erased indicated will be cleared when the data from the erase sector - * is read into the cache and set here when we erase the block. - */ - - if (!IS_ERASED(priv)) - { - off_t esectno = sector >> (W25_SECTOR_SHIFT - W25_SECTOR512_SHIFT); - fvdbg("sector: %ld esectno: %d\n", sector, esectno); - - w25_sectorerase(priv, esectno); - SET_ERASED(priv); - } - - /* Put the cached sector data into the erase state and mart the cache as dirty - * (but don't update the FLASH yet. The caller will do that at a more optimal - * time). - */ - - memset(dest, W25_ERASED_STATE, W25_SECTOR512_SIZE); - SET_DIRTY(priv); -} -#endif - -/************************************************************************************ - * Name: w25_cachewrite - ************************************************************************************/ - -#if defined(CONFIG_W25_SECTOR512) && !defined(CONFIG_W25_READONLY) -static void w25_cachewrite(FAR struct w25_dev_s *priv, FAR const uint8_t *buffer, - off_t sector, size_t nsectors) -{ - FAR uint8_t *dest; - - for (; nsectors > 0; nsectors--) - { - /* First, make sure that the erase block containing 512 byte sector is in - * memory. - */ - - dest = w25_cacheread(priv, sector); - - /* Erase the block containing this sector if it is not already erased. - * The erased indicated will be cleared when the data from the erase sector - * is read into the cache and set here when we erase the sector. - */ - - if (!IS_ERASED(priv)) - { - off_t esectno = sector >> (W25_SECTOR_SHIFT - W25_SECTOR512_SHIFT); - fvdbg("sector: %ld esectno: %d\n", sector, esectno); - - w25_sectorerase(priv, esectno); - SET_ERASED(priv); - } - - /* Copy the new sector data into cached erase block */ - - memcpy(dest, buffer, W25_SECTOR512_SIZE); - SET_DIRTY(priv); - - /* Set up for the next 512 byte sector */ - - buffer += W25_SECTOR512_SIZE; - sector++; - } - - /* Flush the last erase block left in the cache */ - - w25_cacheflush(priv); -} -#endif - -/************************************************************************************ - * Name: w25_erase - ************************************************************************************/ - -static int w25_erase(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks) -{ -#ifdef CONFIG_W25_READONLY - return -EACESS -#else - FAR struct w25_dev_s *priv = (FAR struct w25_dev_s *)dev; - size_t blocksleft = nblocks; - - fvdbg("startblock: %08lx nblocks: %d\n", (long)startblock, (int)nblocks); - - /* Lock access to the SPI bus until we complete the erase */ - - w25_lock(priv->spi); - - while (blocksleft-- > 0) - { - /* Erase each sector */ - -#ifdef CONFIG_W25_SECTOR512 - w25_cacheerase(priv, startblock); -#else - w25_sectorerase(priv, startblock); -#endif - startblock++; - } - -#ifdef CONFIG_W25_SECTOR512 - /* Flush the last erase block left in the cache */ - - w25_cacheflush(priv); -#endif - - w25_unlock(priv->spi); - return (int)nblocks; -#endif -} - -/************************************************************************************ - * Name: w25_bread - ************************************************************************************/ - -static ssize_t w25_bread(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks, - FAR uint8_t *buffer) -{ - ssize_t nbytes; - - fvdbg("startblock: %08lx nblocks: %d\n", (long)startblock, (int)nblocks); - - /* On this device, we can handle the block read just like the byte-oriented read */ - -#ifdef CONFIG_W25_SECTOR512 - nbytes = w25_read(dev, startblock << W25_SECTOR512_SHIFT, nblocks << W25_SECTOR512_SHIFT, buffer); - if (nbytes > 0) - { - nbytes >>= W25_SECTOR512_SHIFT; - } -#else - nbytes = w25_read(dev, startblock << W25_SECTOR_SHIFT, nblocks << W25_SECTOR_SHIFT, buffer); - if (nbytes > 0) - { - nbytes >>= W25_SECTOR_SHIFT; - } -#endif - - return nbytes; -} - -/************************************************************************************ - * Name: w25_bwrite - ************************************************************************************/ - -static ssize_t w25_bwrite(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks, - FAR const uint8_t *buffer) -{ -#ifdef CONFIG_W25_READONLY - return -EACCESS; -#else - FAR struct w25_dev_s *priv = (FAR struct w25_dev_s *)dev; - - fvdbg("startblock: %08lx nblocks: %d\n", (long)startblock, (int)nblocks); - - /* Lock the SPI bus and write all of the pages to FLASH */ - - w25_lock(priv->spi); - -#if defined(CONFIG_W25_SECTOR512) - w25_cachewrite(priv, buffer, startblock, nblocks); -#else - w25_pagewrite(priv, buffer, startblock << W25_SECTOR_SHIFT, - nblocks << W25_SECTOR_SHIFT); -#endif - w25_unlock(priv->spi); - - return nblocks; -#endif -} - -/************************************************************************************ - * Name: w25_read - ************************************************************************************/ - -static ssize_t w25_read(FAR struct mtd_dev_s *dev, off_t offset, size_t nbytes, - FAR uint8_t *buffer) -{ - FAR struct w25_dev_s *priv = (FAR struct w25_dev_s *)dev; - - fvdbg("offset: %08lx nbytes: %d\n", (long)offset, (int)nbytes); - - /* Lock the SPI bus and select this FLASH part */ - - w25_lock(priv->spi); - w25_byteread(priv, buffer, offset, nbytes); - w25_unlock(priv->spi); - - fvdbg("return nbytes: %d\n", (int)nbytes); - return nbytes; -} - -/************************************************************************************ - * Name: w25_ioctl - ************************************************************************************/ - -static int w25_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg) -{ - FAR struct w25_dev_s *priv = (FAR struct w25_dev_s *)dev; - int ret = -EINVAL; /* Assume good command with bad parameters */ - - fvdbg("cmd: %d \n", cmd); - - switch (cmd) - { - case MTDIOC_GEOMETRY: - { - FAR struct mtd_geometry_s *geo = (FAR struct mtd_geometry_s *)((uintptr_t)arg); - if (geo) - { - /* Populate the geometry structure with information need to know - * the capacity and how to access the device. - * - * NOTE: that the device is treated as though it where just an array - * of fixed size blocks. That is most likely not true, but the client - * will expect the device logic to do whatever is necessary to make it - * appear so. - */ - -#ifdef CONFIG_W25_SECTOR512 - geo->blocksize = (1 << W25_SECTOR512_SHIFT); - geo->erasesize = (1 << W25_SECTOR512_SHIFT); - geo->neraseblocks = priv->nsectors << (W25_SECTOR_SHIFT - W25_SECTOR512_SHIFT); -#else - geo->blocksize = W25_SECTOR_SIZE; - geo->erasesize = W25_SECTOR_SIZE; - geo->neraseblocks = priv->nsectors; -#endif - ret = OK; - - fvdbg("blocksize: %d erasesize: %d neraseblocks: %d\n", - geo->blocksize, geo->erasesize, geo->neraseblocks); - } - } - break; - - case MTDIOC_BULKERASE: - { - /* Erase the entire device */ - - w25_lock(priv->spi); - ret = w25_chiperase(priv); - w25_unlock(priv->spi); - } - break; - - case MTDIOC_XIPBASE: - default: - ret = -ENOTTY; /* Bad command */ - break; - } - - fvdbg("return %d\n", ret); - return ret; -} - -/************************************************************************************ - * Public Functions - ************************************************************************************/ - -/************************************************************************************ - * Name: w25_initialize - * - * Description: - * Create an initialize MTD device instance. MTD devices are not registered - * in the file system, but are created as instances that can be bound to - * other functions (such as a block or character driver front end). - * - ************************************************************************************/ - -FAR struct mtd_dev_s *w25_initialize(FAR struct spi_dev_s *spi) -{ - FAR struct w25_dev_s *priv; - int ret; - - fvdbg("spi: %p\n", spi); - - /* Allocate a state structure (we allocate the structure instead of using - * a fixed, static allocation so that we can handle multiple FLASH devices. - * The current implementation would handle only one FLASH part per SPI - * device (only because of the SPIDEV_FLASH definition) and so would have - * to be extended to handle multiple FLASH parts on the same SPI bus. - */ - - priv = (FAR struct w25_dev_s *)kzalloc(sizeof(struct w25_dev_s)); - if (priv) - { - /* Initialize the allocated structure */ - - priv->mtd.erase = w25_erase; - priv->mtd.bread = w25_bread; - priv->mtd.bwrite = w25_bwrite; - priv->mtd.read = w25_read; - priv->mtd.ioctl = w25_ioctl; - priv->spi = spi; - - /* Deselect the FLASH */ - - SPI_SELECT(spi, SPIDEV_FLASH, false); - - /* Identify the FLASH chip and get its capacity */ - - ret = w25_readid(priv); - if (ret != OK) - { - /* Unrecognized! Discard all of that work we just did and return NULL */ - - fdbg("Unrecognized\n"); - kfree(priv); - priv = NULL; - } - else - { - /* Make sure the the FLASH is unprotected so that we can write into it */ - -#ifndef CONFIG_W25_READONLY - w25_unprotect(priv); -#endif - -#ifdef CONFIG_W25_SECTOR512 /* Simulate a 512 byte sector */ - /* Allocate a buffer for the erase block cache */ - - priv->sector = (FAR uint8_t *)kmalloc(W25_SECTOR_SIZE); - if (!priv->sector) - { - /* Allocation failed! Discard all of that work we just did and return NULL */ - - fdbg("Allocation failed\n"); - kfree(priv); - priv = NULL; - } -#endif - } - } - - /* Return the implementation-specific state structure as the MTD device */ - - fvdbg("Return %p\n", priv); - return (FAR struct mtd_dev_s *)priv; -} |