/************************************************************************************ * drivers/mtd/mx25rxx.c * * Copyright (C) 2017 Gregory Nutt. All rights reserved. * Author: Simon Piriou * Derived from QuadSPI-based N25QxxxA driver (drivers/mtd/n25qxxx.c) * Author: dev@ziggurat29.com * * 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 #include #include #include #include #include #include #include #include #include #include /****************************************************************************** * Pre-processor Definitions ******************************************************************************/ /* MX25RXX Commands */ #define MX25R_READ 0x03 /* Read data bytes */ #define MX25R_FAST_READ 0x0b /* Higher speed read */ #define MX25R_2READ 0xbb /* 2 x I/O read command */ #define MX25R_DREAD 0x3b /* 1I / 2O read command */ #define MX25R_4READ 0xeb /* 4 x I/O read command */ #define MX25R_QREAD 0x6b /* 1I / 4O read command */ #define MX25R_PP 0x02 /* Page program */ #define MX25R_4PP 0x38 /* Quad page program */ #define MX25R_SE 0x20 /* 4Kb Sector erase */ #define MX25R_BE32 0x52 /* 32Kbit block Erase */ #define MX25R_BE64 0xd8 /* 64Kbit block Erase */ #define MX25R_CE 0xc7 /* Chip erase */ #define MX25R_CE_ALT 0x60 /* Chip erase (alternate) */ #define MX25R_WREN 0x06 /* Write Enable */ #define MX25R_WRDI 0x04 /* Write Disable */ #define MX25R_RDSR 0x05 /* Read status register */ #define MX25R_RDCR 0x15 /* Read config register */ #define MX25R_WRSR 0x01 /* Write stat/conf register */ #define MX25R_RDID 0x9f /* Read identification */ #define MX25R_RES 0xab /* Read electronic ID */ #define MX25R_REMS 0x90 /* Read manufacture and ID */ #define MX25R_DP 0xb9 /* Deep power down */ #define MX25R_RDP 0xab /* Release deep power down */ #define MX25R_PGM_SUSPEND 0x75 /* Suspends program */ #define MX25R_ERS_SUSPEND 0xb0 /* Suspends erase */ #define MX25R_PGM_RESUME 0x7A /* Resume program */ #define MX25R_ERS_RESUME 0x30 /* Resume erase */ #define MX25R_ENSO 0xb1 /* Enter secured OTP */ #define MX25R_EXSO 0xc1 /* Exit secured OTP */ #define MX25R_RDSCUR 0x2b /* Read security register */ #define MX25R_WRSCUR 0x2f /* Write security register */ #define MX25R_RSTEN 0x66 /* Reset Enable */ #define MX25R_RST 0x99 /* Reset Memory */ #define MX25R_RDSFDP 0x5a /* read out until CS# high */ #define MX25R_SBL 0xc0 /* Set Burst Length */ #define MX25R_SBL_ALT 0x77 /* Set Burst Length */ #define MX25R_NOP 0x00 /* No Operation */ /* MX25Rxx Registers */ /* Read ID (RDID) register values */ #define MX25R_MANUFACTURER 0xc2 /* Macronix manufacturer ID */ #define MX25R6435F_DEVID 0x17 /* MX25R6435F device ID */ /* JEDEC Read ID register values */ #define MX25R_JEDEC_MANUFACTURER 0xc2 /* Macronix manufacturer ID */ #define MX25R_JEDEC_MEMORY_TYPE 0x28 /* MX25Rx memory type */ #define MX25R_JEDEC_MX25R6435F_CAPACITY 0x17 /* MX25R6435F memory capacity */ #define MX25R_JEDEC_MX25R8035F_CAPACITY 0x14 /* MX25R8035F memory capacity */ /* Supported chips parameters */ /* MX25R6435F (64 MB) memory capacity */ #define MX25R6435F_SECTOR_SIZE (4*1024) #define MX25R6435F_SECTOR_SHIFT (12) #define MX25R6435F_SECTOR_COUNT (16384) #define MX25R6435F_PAGE_SIZE (256) #define MX25R6435F_PAGE_SHIFT (8) /* Status register bit definitions */ #define MX25R_SR_WIP (1 << 0) /* Bit 0: Write in progress */ #define MX25R_SR_WEL (1 << 1) /* Bit 1: Write enable latch */ #define MX25R_SR_BP_SHIFT (2) /* Bits 2-5: Block protect bits */ #define MX25R_SR_BP_MASK (15 << MX25R_SR_BP_SHIFT) #define MX25R_SR_QE (1 << 6) /* Bit 6: Quad enable */ #define MX25R_SR_SRWD (1 << 7) /* Bit 7: Status register write protect */ /* Configuration registerregister bit definitions */ #define MX25R_CR_LH (1 << 9) /* Bit 9: Power mode */ #define MX25R_CR_TB (1 << 3) /* Bit 3: Top/bottom selected */ #define MX25R_CR_DC (1 << 6) /* Bit 6: Dummy cycle */ /************************************************************************************ * Private Types ************************************************************************************/ /* Internal state of the MTD device */ struct mx25rxx_dev_s { struct mtd_dev_s mtd; /* MTD interface */ FAR struct qspi_dev_s *qspi; /* QuadSPI interface */ FAR uint8_t *cmdbuf; /* Allocated command buffer */ uint8_t sectorshift; /* 16 or 18 */ uint8_t pageshift; /* 8 */ uint16_t nsectors; /* 128 or 64 */ }; /****************************************************************************** * Private Function Prototypes ******************************************************************************/ /* MTD driver methods */ static int mx25rxx_erase(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks); static ssize_t mx25rxx_bread(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks, FAR uint8_t *buf); static ssize_t mx25rxx_bwrite(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks, FAR const uint8_t *buf); static ssize_t mx25rxx_read(FAR struct mtd_dev_s *dev, off_t offset, size_t nbytes, FAR uint8_t *buffer); static int mx25rxx_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg); /* Internal driver methods */ static void mx25rxx_lock(FAR struct qspi_dev_s *qspi, bool read); static void mx25rxx_unlock(FAR struct qspi_dev_s *qspi); static int mx25rxx_command_read(FAR struct qspi_dev_s *qspi, uint8_t cmd, FAR void *buffer, size_t buflen); static int mx25rxx_command_write(FAR struct qspi_dev_s *qspi, uint8_t cmd, FAR const void *buffer, size_t buflen); static int mx25rxx_command(FAR struct qspi_dev_s *qspi, uint8_t cmd); static int mx25rxx_command_address(FAR struct qspi_dev_s *qspi, uint8_t cmd, off_t addr, uint8_t addrlen); static int mx25rxx_readid(struct mx25rxx_dev_s *dev); static int mx25rxx_read_byte(FAR struct mx25rxx_dev_s *dev, FAR uint8_t *buffer, off_t address, size_t buflen); static int mx25rxx_read_status(FAR struct mx25rxx_dev_s *dev); static int mx25rxx_read_configuration(FAR struct mx25rxx_dev_s *dev); static void mx25rxx_write_status_config(FAR struct mx25rxx_dev_s *dev, uint8_t status, uint16_t config); static void mx25rxx_write_enable(FAR struct mx25rxx_dev_s *dev, bool enable); static int mx25rxx_write_page(struct mx25rxx_dev_s *priv, FAR const uint8_t *buffer, off_t address, size_t buflen); static int mx25rxx_erase_sector(struct mx25rxx_dev_s *priv, off_t sector); static int mx25rxx_erase_block(struct mx25rxx_dev_s *priv, off_t block); static int mx25rxx_erase_chip(struct mx25rxx_dev_s *priv); /****************************************************************************** * Private Functions ******************************************************************************/ void mx25rxx_lock(FAR struct qspi_dev_s *qspi, bool read) { /* 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)QSPI_LOCK(qspi, 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. */ QSPI_SETMODE(qspi, CONFIG_MX25RXX_QSPIMODE); QSPI_SETBITS(qspi, 8); (void)QSPI_SETFREQUENCY(qspi, read ? CONFIG_MX25RXX_QSPI_READ_FREQUENCY : CONFIG_MX25RXX_QSPI_FREQUENCY); } void mx25rxx_unlock(FAR struct qspi_dev_s *qspi) { (void)QSPI_LOCK(qspi, false); } int mx25rxx_command_read(FAR struct qspi_dev_s *qspi, uint8_t cmd, FAR void *buffer, size_t buflen) { struct qspi_cmdinfo_s cmdinfo; finfo("CMD: %02x buflen: %lu\n", cmd, (unsigned long)buflen); cmdinfo.flags = QSPICMD_READDATA; cmdinfo.addrlen = 0; cmdinfo.cmd = cmd; cmdinfo.buflen = buflen; cmdinfo.addr = 0; cmdinfo.buffer = buffer; return QSPI_COMMAND(qspi, &cmdinfo); } int mx25rxx_command_write(FAR struct qspi_dev_s *qspi, uint8_t cmd, FAR const void *buffer, size_t buflen) { struct qspi_cmdinfo_s cmdinfo; finfo("CMD: %02x buflen: %lu 0x%x\n", cmd, (unsigned long)buflen, *(uint32_t*)buffer); cmdinfo.flags = QSPICMD_WRITEDATA; cmdinfo.addrlen = 0; cmdinfo.cmd = cmd; cmdinfo.buflen = buflen; cmdinfo.addr = 0; cmdinfo.buffer = (FAR void *)buffer; return QSPI_COMMAND(qspi, &cmdinfo); } int mx25rxx_command(FAR struct qspi_dev_s *qspi, uint8_t cmd) { struct qspi_cmdinfo_s cmdinfo; finfo("CMD: %02x\n", cmd); cmdinfo.flags = 0; cmdinfo.addrlen = 0; cmdinfo.cmd = cmd; cmdinfo.buflen = 0; cmdinfo.addr = 0; cmdinfo.buffer = NULL; return QSPI_COMMAND(qspi, &cmdinfo); } int mx25rxx_command_address(FAR struct qspi_dev_s *qspi, uint8_t cmd, off_t addr, uint8_t addrlen) { struct qspi_cmdinfo_s cmdinfo; finfo("CMD: %02x Address: %04lx addrlen=%d\n", cmd, (unsigned long)addr, addrlen); cmdinfo.flags = QSPICMD_ADDRESS; cmdinfo.addrlen = addrlen; cmdinfo.cmd = cmd; cmdinfo.buflen = 0; cmdinfo.addr = addr; cmdinfo.buffer = NULL; return QSPI_COMMAND(qspi, &cmdinfo); } int mx25rxx_read_byte(FAR struct mx25rxx_dev_s *dev, FAR uint8_t *buffer, off_t address, size_t buflen) { struct qspi_meminfo_s meminfo; finfo("address: %08lx nbytes: %d\n", (long)address, (int)buflen); meminfo.flags = QSPIMEM_READ | QSPIMEM_QUADIO; meminfo.addrlen = 3; /* Ignore performace enhanced mode => 2+4 dummies */ meminfo.dummies = 6; meminfo.buflen = buflen; meminfo.cmd = MX25R_4READ; meminfo.addr = address; meminfo.buffer = buffer; return QSPI_MEMORY(dev->qspi, &meminfo); } int mx25rxx_write_page(struct mx25rxx_dev_s *priv, FAR const uint8_t *buffer, off_t address, size_t buflen) { struct qspi_meminfo_s meminfo; unsigned int pagesize; unsigned int npages; int ret; int i; finfo("address: %08lx buflen: %u\n", (unsigned long)address, (unsigned)buflen); npages = (buflen >> priv->pageshift); pagesize = (1 << priv->pageshift); /* Set up non-varying parts of transfer description */ meminfo.flags = QSPIMEM_WRITE | QSPIMEM_QUADIO; meminfo.cmd = MX25R_4PP; meminfo.addrlen = 3; meminfo.buflen = pagesize; meminfo.dummies = 0; /* Then write each page */ for (i = 0; i < npages; i++) { /* Set up varying parts of the transfer description */ meminfo.addr = address; meminfo.buffer = (void *)buffer; /* Write one page */ mx25rxx_write_enable(priv, true); ret = QSPI_MEMORY(priv->qspi, &meminfo); mx25rxx_write_enable(priv, false); if (ret < 0) { ferr("ERROR: QSPI_MEMORY failed writing address=%06x\n", address); return ret; } /* Update for the next time through the loop */ buffer += pagesize; address += pagesize; } return OK; } int mx25rxx_erase_sector(struct mx25rxx_dev_s *priv, off_t sector) { off_t address; uint8_t status; finfo("sector: %08lx\n", (unsigned long)sector); /* Get the address associated with the sector */ address = (off_t)sector << priv->sectorshift; /* Send the sector erase command */ mx25rxx_write_enable(priv, true); mx25rxx_command_address(priv->qspi, MX25R_SE, address, 3); /* Wait for erasure to finish */ do { nxsig_usleep(50*1000); mx25rxx_read_status(priv); status = priv->cmdbuf[0]; } while ((status & MX25R_SR_WIP) != 0); return OK; } int mx25rxx_erase_block(struct mx25rxx_dev_s *priv, off_t block) { uint8_t status; finfo("block: %08lx\n", (unsigned long)block); /* Send the 64k block erase command */ mx25rxx_write_enable(priv, true); mx25rxx_command_address(priv->qspi, MX25R_BE64, block << 16, 3); /* Wait for erasure to finish */ do { nxsig_usleep(300*1000); mx25rxx_read_status(priv); status = priv->cmdbuf[0]; } while ((status & MX25R_SR_WIP) != 0); return OK; } int mx25rxx_erase_chip(struct mx25rxx_dev_s *priv) { uint8_t status; /* Erase the whole chip */ mx25rxx_write_enable(priv, true); mx25rxx_command(priv->qspi, MX25R_CE); /* Wait for the erasure to complete */ mx25rxx_read_status(priv); status = priv->cmdbuf[0]; while ((status & MX25R_SR_WIP) != 0) { nxsig_sleep(2); mx25rxx_read_status(priv); status = priv->cmdbuf[0]; } return OK; } void mx25rxx_write_enable(FAR struct mx25rxx_dev_s *dev, bool enable) { uint8_t status; do { mx25rxx_command(dev->qspi, enable ? MX25R_WREN : MX25R_WRDI); mx25rxx_read_status(dev); status = dev->cmdbuf[0]; } while ((status & MX25R_SR_WEL) ^ (enable ? MX25R_SR_WEL : 0)); } int mx25rxx_read_status(FAR struct mx25rxx_dev_s *dev) { return mx25rxx_command_read(dev->qspi, MX25R_RDSR, dev->cmdbuf, 1); } int mx25rxx_read_configuration(FAR struct mx25rxx_dev_s *dev) { return mx25rxx_command_read(dev->qspi, MX25R_RDCR, dev->cmdbuf, 4); } void mx25rxx_write_status_config(FAR struct mx25rxx_dev_s *dev, uint8_t status, uint16_t config) { mx25rxx_write_enable(dev, true); /* take care to mask of the SRP bit; it is one-time-programmable */ config &= ~MX25R_CR_TB; dev->cmdbuf[0] = status | 2; dev->cmdbuf[1] = config & 0xff; dev->cmdbuf[2] = config >> 8; mx25rxx_command_write(dev->qspi, MX25R_WRSR, dev->cmdbuf, 3); mx25rxx_write_enable(dev, false); } int mx25rxx_erase(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks) { FAR struct mx25rxx_dev_s *priv = (FAR struct mx25rxx_dev_s *)dev; size_t blocksleft = nblocks; unsigned int sectorsPerBlock = (64*1024)>>priv->sectorshift; finfo("startblock: %08lx nblocks: %d\n", (long)startblock, (int)nblocks); /* Lock access to the SPI bus until we complete the erase */ mx25rxx_lock(priv->qspi, false); while (blocksleft > 0) { /* Check if current block is aligned on 64k block to speed up erase */ if (((startblock & (sectorsPerBlock-1)) == 0) && (blocksleft >= sectorsPerBlock)) { /* Erase 64k block */ mx25rxx_erase_block(priv, startblock>>(16-priv->sectorshift)); startblock += sectorsPerBlock; blocksleft -= sectorsPerBlock; } else { /* Erase each sector */ mx25rxx_erase_sector(priv, startblock); startblock ++; blocksleft --; } } mx25rxx_unlock(priv->qspi); return (int)nblocks; } ssize_t mx25rxx_bread(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks, FAR uint8_t *buf) { FAR struct mx25rxx_dev_s *mx_dev = (FAR struct mx25rxx_dev_s*)dev; ssize_t nbytes; finfo("startblock: %08lx nblocks: %d\n", (long)startblock, (int)nblocks); nbytes = mx25rxx_read(dev, startblock << mx_dev->pageshift, nblocks << mx_dev->pageshift, buf); if (nbytes > 0) { nbytes >>= mx_dev->pageshift; } return nbytes; } ssize_t mx25rxx_bwrite(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks, FAR const uint8_t *buf) { FAR struct mx25rxx_dev_s *priv = (FAR struct mx25rxx_dev_s *)dev; int ret = (int)nblocks; finfo("startblock: %08lx nblocks: %d\n", (long)startblock, (int)nblocks); /* Lock the QuadSPI bus and write all of the pages to FLASH */ mx25rxx_lock(priv->qspi, false); ret = mx25rxx_write_page(priv, buf, startblock << priv->pageshift, nblocks << priv->pageshift); if (ret < 0) { ferr("ERROR: mx25rxx_write_page failed: %d\n", ret); } mx25rxx_unlock(priv->qspi); return ret < 0 ? ret : nblocks; } ssize_t mx25rxx_read(FAR struct mtd_dev_s *dev, off_t offset, size_t nbytes, FAR uint8_t *buffer) { int ret; FAR struct mx25rxx_dev_s *priv = (FAR struct mx25rxx_dev_s *)dev; finfo("offset: %08lx nbytes: %d\n", (long)offset, (int)nbytes); /* Lock the QuadSPI bus and select this FLASH part */ mx25rxx_lock(priv->qspi, true); ret = mx25rxx_read_byte(priv, buffer, offset, nbytes); mx25rxx_unlock(priv->qspi); if (ret < 0) { ferr("ERROR: mx25rxx_read_byte returned: %d\n", ret); return (ssize_t)ret; } finfo("return nbytes: %d\n", (int)nbytes); return (ssize_t)nbytes; } int mx25rxx_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg) { FAR struct mx25rxx_dev_s *priv = (FAR struct mx25rxx_dev_s *)dev; int ret = -EINVAL; /* Assume good command with bad parameters */ finfo("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; finfo("blocksize: %d erasesize: %d neraseblocks: %d\n", geo->blocksize, geo->erasesize, geo->neraseblocks); } } break; case MTDIOC_BULKERASE: { /* Erase the entire device */ mx25rxx_lock(priv->qspi, false); ret = mx25rxx_erase_chip(priv); mx25rxx_unlock(priv->qspi); } break; default: ret = -ENOTTY; /* Bad/unsupported command */ break; } finfo("return %d\n", ret); return ret; } int mx25rxx_readid(struct mx25rxx_dev_s *dev) { /* Lock the QuadSPI bus and configure the bus. */ mx25rxx_lock(dev->qspi, false); /* Read the JEDEC ID */ mx25rxx_command_read(dev->qspi, MX25R_RDID, dev->cmdbuf, 3); /* Unlock the bus */ mx25rxx_unlock(dev->qspi); finfo("Manufacturer: %02x Device Type %02x, Capacity: %02x\n", dev->cmdbuf[0], dev->cmdbuf[1], dev->cmdbuf[2]); /* Check for Macronix MX25Rxx chip */ if (dev->cmdbuf[0] != MX25R_JEDEC_MANUFACTURER || dev->cmdbuf[1] != MX25R_JEDEC_MEMORY_TYPE) { ferr("ERROR: Unrecognized device type: 0x%02x 0x%02x\n", dev->cmdbuf[0], dev->cmdbuf[1]); return -ENODEV; } /* Check for a supported capacity */ switch (dev->cmdbuf[2]) { case MX25R_JEDEC_MX25R6435F_CAPACITY: dev->sectorshift = MX25R6435F_SECTOR_SHIFT; dev->pageshift = MX25R6435F_PAGE_SHIFT; dev->nsectors = MX25R6435F_SECTOR_COUNT; break; default: ferr("ERROR: Unsupported memory capacity: %02x\n", dev->cmdbuf[2]); return -ENODEV; } return OK; } /****************************************************************************** * Public Functions ******************************************************************************/ /****************************************************************************** * Name: mx25rxx_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 *mx25rxx_initialize(FAR struct qspi_dev_s *qspi, bool unprotect) { FAR struct mx25rxx_dev_s *dev; int ret; uint8_t status; uint16_t config; DEBUGASSERT(qspi != NULL); /* 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 QuadSPI * device (only because of the QSPIDEV_FLASH(0) definition) and so would have * to be extended to handle multiple FLASH parts on the same QuadSPI bus. */ dev = (FAR struct mx25rxx_dev_s *)kmm_zalloc(sizeof(*dev)); if (dev == NULL) { ferr("Failed to allocate mtd device\n"); return NULL; } dev->mtd.erase = mx25rxx_erase; dev->mtd.bread = mx25rxx_bread; dev->mtd.bwrite = mx25rxx_bwrite; dev->mtd.read = mx25rxx_read; dev->mtd.ioctl = mx25rxx_ioctl; dev->qspi = qspi; /* Allocate a 4-byte buffer to support DMA-able command data */ dev->cmdbuf = (FAR uint8_t *)QSPI_ALLOC(qspi, 4); if (dev->cmdbuf == NULL) { ferr("Failed to allocate command buffer\n"); goto exit_free_dev; } /* Identify the FLASH chip and get its capacity */ ret = mx25rxx_readid(dev); if (ret != OK) { /* Unrecognized! Discard all of that work we just did and return NULL */ ferr("Unrecognized QSPI device\n"); goto exit_free_cmdbuf; } mx25rxx_lock(dev->qspi, false); /* Set MTD device in low power mode, with minimum dummy cycles */ mx25rxx_write_status_config(dev, MX25R_SR_QE, 0x0000); mx25rxx_read_status(dev); status = dev->cmdbuf[0]; mx25rxx_read_configuration(dev); config = *(uint16_t*)(dev->cmdbuf); /* FIXME avoid compiler warnings in case info logs are disabled */ (void)status; (void)config; finfo("device ready 0x%02x 0x%04x\n", status, config); mx25rxx_unlock(dev->qspi); #ifdef CONFIG_MTD_REGISTRATION /* Register the MTD with the procfs system if enabled */ mtd_register(&dev->mtd, "mx25rxx"); #endif /* Return the implementation-specific state structure as the MTD device */ return &dev->mtd; exit_free_cmdbuf: QSPI_FREE(qspi, dev->cmdbuf); exit_free_dev: kmm_free(dev); return NULL; }