diff options
Diffstat (limited to 'nuttx/drivers/mtd/at25.c')
| -rw-r--r-- | nuttx/drivers/mtd/at25.c | 710 |
1 files changed, 0 insertions, 710 deletions
diff --git a/nuttx/drivers/mtd/at25.c b/nuttx/drivers/mtd/at25.c deleted file mode 100644 index c58b16122..000000000 --- a/nuttx/drivers/mtd/at25.c +++ /dev/null @@ -1,710 +0,0 @@ -/************************************************************************************ - * drivers/mtd/at25.c - * Driver for SPI-based AT25DF321 (32Mbit) flash. - * - * Copyright (C) 2009-2012 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <gnutt@nuttx.org> - * Petteri Aimonen <jpa@nx.mail.kapsi.fi> - * - * 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 <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 - ************************************************************************************/ - -#ifndef CONFIG_AT25_SPIMODE -# define CONFIG_AT25_SPIMODE SPIDEV_MODE0 -#endif - -/* AT25 Registers *******************************************************************/ -/* Indentification register values */ - -#define AT25_MANUFACTURER 0x1F -#define AT25_AT25DF321_TYPE 0x47 /* 32 M-bit */ - -/* AT25DF321 capacity is 4,194,304 bytes: - * (64 sectors) * (65,536 bytes per sector) - * (16384 pages) * (256 bytes per page) - */ - -#define AT25_AT25DF321_SECTOR_SHIFT 12 /* Sector size 1 << 12 = 4096 */ -#define AT25_AT25DF321_NSECTORS 1024 -#define AT25_AT25DF321_PAGE_SHIFT 9 /* Page size 1 << 9 = 512 */ -#define AT25_AT25DF321_NPAGES 8192 - -/* Instructions */ -/* Command Value N Description Addr Dummy Data */ -#define AT25_WREN 0x06 /* 1 Write Enable 0 0 0 */ -#define AT25_WRDI 0x04 /* 1 Write Disable 0 0 0 */ -#define AT25_RDID 0x9f /* 1 Read Identification 0 0 1-3 */ -#define AT25_RDSR 0x05 /* 1 Read Status Register 0 0 >=1 */ -#define AT25_WRSR 0x01 /* 1 Write Status Register 0 0 1 */ -#define AT25_READ 0x03 /* 1 Read Data Bytes 3 0 >=1 */ -#define AT25_FAST_READ 0x0b /* 1 Higher speed read 3 1 >=1 */ -#define AT25_PP 0x02 /* 1 Page Program 3 0 1-256 */ -#define AT25_SE 0x20 /* 1 Sector Erase 3 0 0 */ -#define AT25_BE 0xc7 /* 1 Bulk Erase 0 0 0 */ -#define AT25_DP 0xb9 /* 2 Deep power down 0 0 0 */ -#define AT25_RES 0xab /* 2 Read Electronic Signature 0 3 >=1 */ - -/* Status register bit definitions */ - -#define AT25_SR_WIP (1 << 0) /* Bit 0: Write in progress bit */ -#define AT25_SR_WEL (1 << 1) /* Bit 1: Write enable latch bit */ -#define AT25_SR_EPE (1 << 5) /* Bit 5: Erase/program error */ -#define AT25_SR_UNPROT 0x00 /* Global unprotect command */ - -#define AT25_DUMMY 0xa5 - -/************************************************************************************ - * 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 at25_dev_s. - */ - -struct at25_dev_s -{ - struct mtd_dev_s mtd; /* MTD interface */ - FAR struct spi_dev_s *dev; /* Saved SPI interface instance */ - uint8_t sectorshift; /* 16 or 18 */ - uint8_t pageshift; /* 8 */ - uint16_t nsectors; /* 128 or 64 */ - uint32_t npages; /* 32,768 or 65,536 */ -}; - -/************************************************************************************ - * Private Function Prototypes - ************************************************************************************/ - -/* Helpers */ - -static void at25_lock(FAR struct spi_dev_s *dev); -static inline void at25_unlock(FAR struct spi_dev_s *dev); -static inline int at25_readid(struct at25_dev_s *priv); -static void at25_waitwritecomplete(struct at25_dev_s *priv); -static void at25_writeenable(struct at25_dev_s *priv); -static inline void at25_sectorerase(struct at25_dev_s *priv, off_t offset); -static inline int at25_bulkerase(struct at25_dev_s *priv); -static inline void at25_pagewrite(struct at25_dev_s *priv, FAR const uint8_t *buffer, - off_t offset); - -/* MTD driver methods */ - -static int at25_erase(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks); -static ssize_t at25_bread(FAR struct mtd_dev_s *dev, off_t startblock, - size_t nblocks, FAR uint8_t *buf); -static ssize_t at25_bwrite(FAR struct mtd_dev_s *dev, off_t startblock, - size_t nblocks, FAR const uint8_t *buf); -static ssize_t at25_read(FAR struct mtd_dev_s *dev, off_t offset, size_t nbytes, - FAR uint8_t *buffer); -static int at25_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg); - -/************************************************************************************ - * Private Data - ************************************************************************************/ - -/************************************************************************************ - * Private Functions - ************************************************************************************/ - -/************************************************************************************ - * Name: at25_lock - ************************************************************************************/ - -static void at25_lock(FAR struct spi_dev_s *dev) -{ - /* 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(dev, 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(dev, CONFIG_AT25_SPIMODE); - SPI_SETBITS(dev, 8); - (void)SPI_SETFREQUENCY(dev, 20000000); -} - -/************************************************************************************ - * Name: at25_unlock - ************************************************************************************/ - -static inline void at25_unlock(FAR struct spi_dev_s *dev) -{ - (void)SPI_LOCK(dev, false); -} - -/************************************************************************************ - * Name: at25_readid - ************************************************************************************/ - -static inline int at25_readid(struct at25_dev_s *priv) -{ - uint16_t manufacturer; - uint16_t memory; - uint16_t version; - - fvdbg("priv: %p\n", priv); - - /* Lock the SPI bus, configure the bus, and select this FLASH part. */ - - at25_lock(priv->dev); - SPI_SELECT(priv->dev, SPIDEV_FLASH, true); - - /* Send the "Read ID (RDID)" command and read the first three ID bytes */ - - (void)SPI_SEND(priv->dev, AT25_RDID); - manufacturer = SPI_SEND(priv->dev, AT25_DUMMY); - memory = SPI_SEND(priv->dev, AT25_DUMMY); - - /* Deselect the FLASH and unlock the bus */ - - SPI_SELECT(priv->dev, SPIDEV_FLASH, false); - at25_unlock(priv->dev); - - fvdbg("manufacturer: %02x memory: %02x\n", - manufacturer, memory); - - /* Check for a valid manufacturer and memory type */ - - if (manufacturer == AT25_MANUFACTURER && memory == AT25_AT25DF321_TYPE) - { - priv->sectorshift = AT25_AT25DF321_SECTOR_SHIFT; - priv->nsectors = AT25_AT25DF321_NSECTORS; - priv->pageshift = AT25_AT25DF321_PAGE_SHIFT; - priv->npages = AT25_AT25DF321_NPAGES; - return OK; - } - - return -ENODEV; -} - -/************************************************************************************ - * Name: at25_waitwritecomplete - ************************************************************************************/ - -static void at25_waitwritecomplete(struct at25_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->dev, SPIDEV_FLASH, true); - - /* Send "Read Status Register (RDSR)" command */ - - (void)SPI_SEND(priv->dev, AT25_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->dev, AT25_DUMMY); - } - while ((status & AT25_SR_WIP) != 0); - - /* Deselect the FLASH */ - - SPI_SELECT(priv->dev, SPIDEV_FLASH, false); - -#else - - /* Loop as long as the memory is busy with a write cycle */ - - do - { - /* Select this FLASH part */ - - SPI_SELECT(priv->dev, SPIDEV_FLASH, true); - - /* Send "Read Status Register (RDSR)" command */ - - (void)SPI_SEND(priv->dev, AT25_RDSR); - - /* Send a dummy byte to generate the clock needed to shift out the status */ - - status = SPI_SEND(priv->dev, AT25_DUMMY); - - /* Deselect the FLASH */ - - SPI_SELECT(priv->dev, 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 ((status & AT25_SR_WIP) != 0) - { - at25_unlock(priv->dev); - usleep(10000); - at25_lock(priv->dev); - } - } - while ((status & AT25_SR_WIP) != 0); -#endif - - if (status & AT25_SR_EPE) - { - fdbg("Write error, status: 0x%02x\n", status); - } - - fvdbg("Complete, status: 0x%02x\n", status); -} - -/************************************************************************************ - * Name: at25_writeenable - ************************************************************************************/ - -static void at25_writeenable(struct at25_dev_s *priv) -{ - SPI_SELECT(priv->dev, SPIDEV_FLASH, true); - (void)SPI_SEND(priv->dev, AT25_WREN); - SPI_SELECT(priv->dev, SPIDEV_FLASH, false); - fvdbg("Enabled\n"); -} - -/************************************************************************************ - * Name: at25_sectorerase - ************************************************************************************/ - -static inline void at25_sectorerase(struct at25_dev_s *priv, off_t sector) -{ - off_t offset = sector << priv->sectorshift; - - fvdbg("sector: %08lx\n", (long)sector); - - /* Wait for any preceding write to complete. We could simplify things by - * perform this wait at the end of each write operation (rather than at - * the beginning of ALL operations), but have the wait first will slightly - * improve performance. - */ - - at25_waitwritecomplete(priv); - - /* Send write enable instruction */ - - at25_writeenable(priv); - - /* Select this FLASH part */ - - SPI_SELECT(priv->dev, SPIDEV_FLASH, true); - - /* Send the "Sector Erase (SE)" instruction */ - - (void)SPI_SEND(priv->dev, AT25_SE); - - /* Send the sector offset high byte first. For all of the supported - * parts, the sector number is completely contained in the first byte - * and the values used in the following two bytes don't really matter. - */ - - (void)SPI_SEND(priv->dev, (offset >> 16) & 0xff); - (void)SPI_SEND(priv->dev, (offset >> 8) & 0xff); - (void)SPI_SEND(priv->dev, offset & 0xff); - - /* Deselect the FLASH */ - - SPI_SELECT(priv->dev, SPIDEV_FLASH, false); - fvdbg("Erased\n"); -} - -/************************************************************************************ - * Name: at25_bulkerase - ************************************************************************************/ - -static inline int at25_bulkerase(struct at25_dev_s *priv) -{ - fvdbg("priv: %p\n", priv); - - /* Wait for any preceding write to complete. We could simplify things by - * perform this wait at the end of each write operation (rather than at - * the beginning of ALL operations), but have the wait first will slightly - * improve performance. - */ - - at25_waitwritecomplete(priv); - - /* Send write enable instruction */ - - at25_writeenable(priv); - - /* Select this FLASH part */ - - SPI_SELECT(priv->dev, SPIDEV_FLASH, true); - - /* Send the "Bulk Erase (BE)" instruction */ - - (void)SPI_SEND(priv->dev, AT25_BE); - - /* Deselect the FLASH */ - - SPI_SELECT(priv->dev, SPIDEV_FLASH, false); - fvdbg("Return: OK\n"); - return OK; -} - -/************************************************************************************ - * Name: at25_pagewrite - ************************************************************************************/ - -static inline void at25_pagewrite(struct at25_dev_s *priv, FAR const uint8_t *buffer, - off_t page) -{ - off_t offset = page << 8; - - fvdbg("page: %08lx offset: %08lx\n", (long)page, (long)offset); - - /* Wait for any preceding write to complete. We could simplify things by - * perform this wait at the end of each write operation (rather than at - * the beginning of ALL operations), but have the wait first will slightly - * improve performance. - */ - - at25_waitwritecomplete(priv); - - /* Enable the write access to the FLASH */ - - at25_writeenable(priv); - - /* Select this FLASH part */ - - SPI_SELECT(priv->dev, SPIDEV_FLASH, true); - - /* Send "Page Program (PP)" command */ - - (void)SPI_SEND(priv->dev, AT25_PP); - - /* Send the page offset high byte first. */ - - (void)SPI_SEND(priv->dev, (offset >> 16) & 0xff); - (void)SPI_SEND(priv->dev, (offset >> 8) & 0xff); - (void)SPI_SEND(priv->dev, offset & 0xff); - - /* Then write the specified number of bytes */ - - SPI_SNDBLOCK(priv->dev, buffer, 256); - - /* Deselect the FLASH: Chip Select high */ - - SPI_SELECT(priv->dev, SPIDEV_FLASH, false); - fvdbg("Written\n"); -} - -/************************************************************************************ - * Name: at25_erase - ************************************************************************************/ - -static int at25_erase(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks) -{ - FAR struct at25_dev_s *priv = (FAR struct at25_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 */ - - at25_lock(priv->dev); - while (blocksleft-- > 0) - { - /* Erase each sector */ - - at25_sectorerase(priv, startblock); - startblock++; - } - - at25_unlock(priv->dev); - return (int)nblocks; -} - -/************************************************************************************ - * Name: at25_bread - ************************************************************************************/ - -static ssize_t at25_bread(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks, - FAR uint8_t *buffer) -{ - FAR struct at25_dev_s *priv = (FAR struct at25_dev_s *)dev; - 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 */ - - nbytes = at25_read(dev, startblock << priv->pageshift, nblocks << priv->pageshift, buffer); - if (nbytes > 0) - { - return nbytes >> priv->pageshift; - } - - return (int)nbytes; -} - -/************************************************************************************ - * Name: at25_bwrite - ************************************************************************************/ - -static ssize_t at25_bwrite(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks, - FAR const uint8_t *buffer) -{ - FAR struct at25_dev_s *priv = (FAR struct at25_dev_s *)dev; - size_t blocksleft = nblocks; - - fvdbg("startblock: %08lx nblocks: %d\n", (long)startblock, (int)nblocks); - - /* Lock the SPI bus and write each page to FLASH */ - - at25_lock(priv->dev); - while (blocksleft-- > 0) - { - at25_pagewrite(priv, buffer, startblock * 2); - at25_pagewrite(priv, buffer + 256, startblock * 2 + 1); - buffer += 1 << priv->pageshift; - startblock++; - } - - at25_unlock(priv->dev); - return nblocks; -} - -/************************************************************************************ - * Name: at25_read - ************************************************************************************/ - -static ssize_t at25_read(FAR struct mtd_dev_s *dev, off_t offset, size_t nbytes, - FAR uint8_t *buffer) -{ - FAR struct at25_dev_s *priv = (FAR struct at25_dev_s *)dev; - - fvdbg("offset: %08lx nbytes: %d\n", (long)offset, (int)nbytes); - - /* Wait for any preceding write to complete. We could simplify things by - * perform this wait at the end of each write operation (rather than at - * the beginning of ALL operations), but have the wait first will slightly - * improve performance. - */ - - at25_waitwritecomplete(priv); - - /* Lock the SPI bus and select this FLASH part */ - - at25_lock(priv->dev); - SPI_SELECT(priv->dev, SPIDEV_FLASH, true); - - /* Send "Read from Memory " instruction */ - - (void)SPI_SEND(priv->dev, AT25_READ); - - /* Send the page offset high byte first. */ - - (void)SPI_SEND(priv->dev, (offset >> 16) & 0xff); - (void)SPI_SEND(priv->dev, (offset >> 8) & 0xff); - (void)SPI_SEND(priv->dev, offset & 0xff); - - /* Then read all of the requested bytes */ - - SPI_RECVBLOCK(priv->dev, buffer, nbytes); - - /* Deselect the FLASH and unlock the SPI bus */ - - SPI_SELECT(priv->dev, SPIDEV_FLASH, false); - at25_unlock(priv->dev); - - fvdbg("return nbytes: %d\n", (int)nbytes); - return nbytes; -} - -/************************************************************************************ - * Name: at25_ioctl - ************************************************************************************/ - -static int at25_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg) -{ - FAR struct at25_dev_s *priv = (FAR struct at25_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. - */ - - geo->blocksize = (1 << priv->pageshift); - geo->erasesize = (1 << priv->sectorshift); - geo->neraseblocks = priv->nsectors; - ret = OK; - - fvdbg("blocksize: %d erasesize: %d neraseblocks: %d\n", - geo->blocksize, geo->erasesize, geo->neraseblocks); - } - } - break; - - case MTDIOC_BULKERASE: - { - /* Erase the entire device */ - - at25_lock(priv->dev); - ret = at25_bulkerase(priv); - at25_unlock(priv->dev); - } - break; - - case MTDIOC_XIPBASE: - default: - ret = -ENOTTY; /* Bad command */ - break; - } - - fvdbg("return %d\n", ret); - return ret; -} - -/************************************************************************************ - * Public Functions - ************************************************************************************/ - -/************************************************************************************ - * Name: at25_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 *at25_initialize(FAR struct spi_dev_s *dev) -{ - FAR struct at25_dev_s *priv; - int ret; - - fvdbg("dev: %p\n", dev); - - /* 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 at25_dev_s *)kmalloc(sizeof(struct at25_dev_s)); - if (priv) - { - /* Initialize the allocated structure */ - - priv->mtd.erase = at25_erase; - priv->mtd.bread = at25_bread; - priv->mtd.bwrite = at25_bwrite; - priv->mtd.read = at25_read; - priv->mtd.ioctl = at25_ioctl; - priv->dev = dev; - - /* Deselect the FLASH */ - - SPI_SELECT(dev, SPIDEV_FLASH, false); - - /* Identify the FLASH chip and get its capacity */ - - ret = at25_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 - { - /* Unprotect all sectors */ - - at25_writeenable(priv); - SPI_SELECT(priv->dev, SPIDEV_FLASH, true); - (void)SPI_SEND(priv->dev, AT25_WRSR); - (void)SPI_SEND(priv->dev, AT25_SR_UNPROT); - SPI_SELECT(priv->dev, SPIDEV_FLASH, false); - } - } - - /* Return the implementation-specific state structure as the MTD device */ - - fvdbg("Return %p\n", priv); - return (FAR struct mtd_dev_s *)priv; -} |