On 4/24/2015 11:55 PM, Simon Glass wrote:
> Hi Haikun,
>
> On 24 April 2015 at 07:22, Haikun Wang <haikun.w...@freescale.com> wrote:
>> Atmel DataFlash chips have commands different from common spi
>> flash commands.
>> Atmel DataFlash also have special page-size.
>> This driver add support for accessing Atmel DataFlash.
>> It is based on the Driver Model.
>>
>> Signed-off-by: Haikun Wang <haikun.w...@freescale.com>
>> ---
>> Verified with AT45DB021B.
>>
>> Changes in v2:
>> - 1. Correct comment style
>> - 2. Use get_timer in dataflash_waitready to check whether timeout
>> - 3. Remove struct spi_flash * in struct dataflash, and get it from
>> udevice->uclass_priv
>> - 4. Replace spi_flash_write_common with spi_flash_cmd_write
>> - 5. Replace spi_flash_read with spi_flash_cmd_read
>> - 6. Change type of varible "status" form char to u8 in dataflash_status
>> - 7. Change add_dataflash's argument type due to <change 3>
>> - 8. Add claim_bus and release_bus in erase/write/read due to <change 5 & 6>
>>
>> Changes in v1: None
>> drivers/mtd/spi/Makefile | 1 +
>> drivers/mtd/spi/spi_dataflash.c | 704
>> ++++++++++++++++++++++++++++++++++++++++
>> 2 files changed, 705 insertions(+)
>> create mode 100644 drivers/mtd/spi/spi_dataflash.c
>
> Reviewed-by: Simon Glass <s...@chromium.org>
>
> See a small questoin below.
>
>>
>> diff --git a/drivers/mtd/spi/Makefile b/drivers/mtd/spi/Makefile
>> index c61b784..42acd24 100644
>> --- a/drivers/mtd/spi/Makefile
>> +++ b/drivers/mtd/spi/Makefile
>> @@ -15,6 +15,7 @@ endif
>> #ifndef CONFIG_DM_SPI
>> obj-$(CONFIG_SPI_FLASH) += sf_probe.o
>> #endif
>> +obj-$(CONFIG_DM_SPI_DATAFLASH) += spi_dataflash.o
>> obj-$(CONFIG_CMD_SF) += sf.o
>> obj-$(CONFIG_SPI_FLASH) += sf_ops.o sf_params.o
>> obj-$(CONFIG_SPI_FLASH_SANDBOX) += sandbox.o
>> diff --git a/drivers/mtd/spi/spi_dataflash.c
>> b/drivers/mtd/spi/spi_dataflash.c
>> new file mode 100644
>> index 0000000..c68cf2e
>> --- /dev/null
>> +++ b/drivers/mtd/spi/spi_dataflash.c
>> @@ -0,0 +1,704 @@
>> +/*
>> + *
>> + * Atmel DataFlash probing
>> + *
>> + * Copyright (C) 2004-2009, 2015 Freescale Semiconductor, Inc.
>> + * Haikun Wang (haikun.w...@freescale.com)
>> + *
>> + * SPDX-License-Identifier: GPL-2.0+
>> +*/
>> +#include <common.h>
>> +#include <dm.h>
>> +#include <errno.h>
>> +#include <fdtdec.h>
>> +#include <spi.h>
>> +#include <spi_flash.h>
>> +#include <div64.h>
>> +#include <linux/err.h>
>> +#include <linux/math64.h>
>> +
>> +#include "sf_internal.h"
>> +
>> +/*
>> + * DataFlash is a kind of SPI flash. Most AT45 chips have two buffers in
>> + * each chip, which may be used for double buffered I/O; but this driver
>> + * doesn't (yet) use these for any kind of i/o overlap or prefetching.
>> + *
>> + * Sometimes DataFlash is packaged in MMC-format cards, although the
>> + * MMC stack can't (yet?) distinguish between MMC and DataFlash
>> + * protocols during enumeration.
>> + */
>> +
>> +/* reads can bypass the buffers */
>> +#define OP_READ_CONTINUOUS 0xE8
>> +#define OP_READ_PAGE 0xD2
>> +
>> +/* group B requests can run even while status reports "busy" */
>> +#define OP_READ_STATUS 0xD7 /* group B */
>> +
>> +/* move data between host and buffer */
>> +#define OP_READ_BUFFER1 0xD4 /* group B */
>> +#define OP_READ_BUFFER2 0xD6 /* group B */
>> +#define OP_WRITE_BUFFER1 0x84 /* group B */
>> +#define OP_WRITE_BUFFER2 0x87 /* group B */
>> +
>> +/* erasing flash */
>> +#define OP_ERASE_PAGE 0x81
>> +#define OP_ERASE_BLOCK 0x50
>> +
>> +/* move data between buffer and flash */
>> +#define OP_TRANSFER_BUF1 0x53
>> +#define OP_TRANSFER_BUF2 0x55
>> +#define OP_MREAD_BUFFER1 0xD4
>> +#define OP_MREAD_BUFFER2 0xD6
>> +#define OP_MWERASE_BUFFER1 0x83
>> +#define OP_MWERASE_BUFFER2 0x86
>> +#define OP_MWRITE_BUFFER1 0x88 /* sector must be pre-erased */
>> +#define OP_MWRITE_BUFFER2 0x89 /* sector must be pre-erased */
>> +
>> +/* write to buffer, then write-erase to flash */
>> +#define OP_PROGRAM_VIA_BUF1 0x82
>> +#define OP_PROGRAM_VIA_BUF2 0x85
>> +
>> +/* compare buffer to flash */
>> +#define OP_COMPARE_BUF1 0x60
>> +#define OP_COMPARE_BUF2 0x61
>> +
>> +/* read flash to buffer, then write-erase to flash */
>> +#define OP_REWRITE_VIA_BUF1 0x58
>> +#define OP_REWRITE_VIA_BUF2 0x59
>> +
>> +/*
>> + * newer chips report JEDEC manufacturer and device IDs; chip
>> + * serial number and OTP bits; and per-sector writeprotect.
>> + */
>> +#define OP_READ_ID 0x9F
>> +#define OP_READ_SECURITY 0x77
>> +#define OP_WRITE_SECURITY_REVC 0x9A
>> +#define OP_WRITE_SECURITY 0x9B /* revision D */
>> +
>> +
>> +struct dataflash {
>> + uint8_t command[16];
>> + unsigned short page_offset; /* offset in flash address */
>> +};
>> +
>> +/*
>> + * Return the status of the DataFlash device.
>> + */
>> +static inline int dataflash_status(struct spi_slave *spi)
>> +{
>> + int ret;
>> + u8 status;
>> + /*
>> + * NOTE: at45db321c over 25 MHz wants to write
>> + * a dummy byte after the opcode...
>> + */
>> + ret = spi_flash_cmd(spi, OP_READ_STATUS, &status, 1);
>> + return ret ? -EIO : status;
>> +}
>> +
>> +/*
>> + * Poll the DataFlash device until it is READY.
>> + * This usually takes 5-20 msec or so; more for sector erase.
>> + * ready: return > 0
>> + */
>> +static int dataflash_waitready(struct spi_slave *spi)
>> +{
>> + int status;
>> + int timeout = 2 * CONFIG_SYS_HZ;
>> + int timebase;
>> +
>> + timebase = get_timer(0);
>> + do {
>> + status = dataflash_status(spi);
>> + if (status < 0)
>> + status = 0;
>> +
>> + if (status & (1 << 7)) /* RDY/nBSY */
>> + return status;
>> +
>> + mdelay(3);
>> + } while (get_timer(timebase) < timeout);
>> +
>> + return -ETIME;
>> +}
>> +
>> +/*
>> + * Erase pages of flash.
>> + */
>> +static int spi_dataflash_erase(struct udevice *dev, u32 offset, size_t len)
>> +{
>> + struct dataflash *dataflash;
>> + struct spi_flash *spi_flash;
>> + struct spi_slave *spi;
>> + unsigned blocksize;
>> + uint8_t *command;
>> + uint32_t rem;
>> + int status;
>> +
>> + dataflash = dev->priv;
>> + spi_flash = dev->uclass_priv;
>> + spi = spi_flash->spi;
>> +
>> + blocksize = spi_flash->page_size << 3;
>> +
>> + memset(dataflash->command, 0 , sizeof(dataflash->command));
>> + command = dataflash->command;
>> +
>> + debug("%s: erase addr=0x%x len 0x%x\n", dev->name, offset, len);
>> +
>> + div_u64_rem(len, spi_flash->page_size, &rem);
>> + if (rem)
>> + return -EINVAL;
>> + div_u64_rem(offset, spi_flash->page_size, &rem);
>> + if (rem)
>> + return -EINVAL;
>> +
>> + status = spi_claim_bus(spi);
>> + if (status) {
>> + debug("SPI DATAFLASH: unable to claim SPI bus\n");
>> + return status;
>> + }
>> +
>> + while (len > 0) {
>> + unsigned int pageaddr;
>> + int do_block;
>> + /*
>> + * Calculate flash page address; use block erase (for speed)
>> if
>> + * we're at a block boundary and need to erase the whole
>> block.
>> + */
>> + pageaddr = div_u64(offset, spi_flash->page_size);
>> + do_block = (pageaddr & 0x7) == 0 && len >= blocksize;
>> + pageaddr = pageaddr << dataflash->page_offset;
>> +
>> + command[0] = do_block ? OP_ERASE_BLOCK : OP_ERASE_PAGE;
>> + command[1] = (uint8_t)(pageaddr >> 16);
>> + command[2] = (uint8_t)(pageaddr >> 8);
>> + command[3] = 0;
>> +
>> + debug("%s ERASE %s: (%x) %x %x %x [%d]\n",
>> + dev->name, do_block ? "block" : "page",
>> + command[0], command[1], command[2], command[3],
>> + pageaddr);
>> +
>> + status = spi_flash_cmd_write(spi, command, 4, NULL, 0);
>> + if (status < 0) {
>> + debug("%s: erase send command error!\n", dev->name);
>> + return -EIO;
>> + }
>> +
>> + status = dataflash_waitready(spi);
>> + if (status < 0) {
>> + debug("%s: erase waitready error!\n", dev->name);
>> + return status;
>> + }
>> +
>> + if (do_block) {
>> + offset += blocksize;
>> + len -= blocksize;
>> + } else {
>> + offset += spi_flash->page_size;
>> + len -= spi_flash->page_size;
>> + }
>> + }
>> +
>> + spi_release_bus(spi);
>> +
>> + return 0;
>> +}
>> +
>> +/*
>> + * Read from the DataFlash device.
>> + * offset : Start offset in flash device
>> + * len : Amount to read
>> + * buf : Buffer containing the data
>> + */
>> +static int spi_dataflash_read(struct udevice *dev, u32 offset, size_t len,
>> + void *buf)
>> +{
>> + struct dataflash *dataflash;
>> + struct spi_flash *spi_flash;
>> + struct spi_slave *spi;
>> + unsigned int addr;
>> + uint8_t *command;
>> + int status;
>> +
>> + dataflash = dev->priv;
>> + spi_flash = dev->uclass_priv;
>> + spi = spi_flash->spi;
>> +
>> + memset(dataflash->command, 0 , sizeof(dataflash->command));
>> + command = dataflash->command;
>> +
>> + debug("%s: erase addr=0x%x len 0x%x\n", dev->name, offset, len);
>> + debug("READ: (%x) %x %x %x\n",
>> + command[0], command[1], command[2], command[3]);
>> +
>> + /* Calculate flash page/byte address */
>> + addr = (((unsigned)offset / spi_flash->page_size)
>> + << dataflash->page_offset)
>> + + ((unsigned)offset % spi_flash->page_size);
>> +
>> + status = spi_claim_bus(spi);
>> + if (status) {
>> + debug("SPI DATAFLASH: unable to claim SPI bus\n");
>> + return status;
>> + }
>> +
>> + /*
>> + * Continuous read, max clock = f(car) which may be less than
>> + * the peak rate available. Some chips support commands with
>> + * fewer "don't care" bytes. Both buffers stay unchanged.
>> + */
>> + command[0] = OP_READ_CONTINUOUS;
>> + command[1] = (uint8_t)(addr >> 16);
>> + command[2] = (uint8_t)(addr >> 8);
>> + command[3] = (uint8_t)(addr >> 0);
>> +
>> + /* plus 4 "don't care" bytes, command len: 4 + 4 "don't care" bytes
>> */
>> + status = spi_flash_cmd_read(spi, command, 8, buf, len);
>> +
>> + spi_release_bus(spi);
>> +
>> + return status;
>> +}
>> +
>> +/*
>> + * Write to the DataFlash device.
>> + * offset : Start offset in flash device
>> + * len : Amount to write
>> + * buf : Buffer containing the data
>> + */
>> +int spi_dataflash_write(struct udevice *dev, u32 offset, size_t len,
>> + const void *buf)
>> +{
>> + struct dataflash *dataflash;
>> + struct spi_flash *spi_flash;
>> + struct spi_slave *spi;
>> + uint8_t *command;
>> + unsigned int pageaddr, addr, to, writelen;
>> + size_t remaining = len;
>> + u_char *writebuf = (u_char *)buf;
>> + int status = -EINVAL;
>> +
>> + dataflash = dev->priv;
>> + spi_flash = dev->uclass_priv;
>> + spi = spi_flash->spi;
>> +
>> + memset(dataflash->command, 0 , sizeof(dataflash->command));
>> + command = dataflash->command;
>> +
>> + debug("%s: write 0x%x..0x%x\n", dev->name, offset, (offset + len));
>> +
>> + pageaddr = ((unsigned)offset / spi_flash->page_size);
>> + to = ((unsigned)offset % spi_flash->page_size);
>> + if (to + len > spi_flash->page_size)
>> + writelen = spi_flash->page_size - to;
>> + else
>> + writelen = len;
>> +
>> + status = spi_claim_bus(spi);
>> + if (status) {
>> + debug("SPI DATAFLASH: unable to claim SPI bus\n");
>> + return status;
>> + }
>> +
>> + while (remaining > 0) {
>> + debug("write @ %d:%d len=%d\n", pageaddr, to, writelen);
>> +
>> + /*
>> + * REVISIT:
>> + * (a) each page in a sector must be rewritten at least
>> + * once every 10K sibling erase/program operations.
>> + * (b) for pages that are already erased, we could
>> + * use WRITE+MWRITE not PROGRAM for ~30% speedup.
>> + * (c) WRITE to buffer could be done while waiting for
>> + * a previous MWRITE/MWERASE to complete ...
>> + * (d) error handling here seems to be mostly missing.
>> + *
>> + * Two persistent bits per page, plus a per-sector counter,
>> + * could support (a) and (b) ... we might consider using
>> + * the second half of sector zero, which is just one block,
>> + * to track that state. (On AT91, that sector should also
>> + * support boot-from-DataFlash.)
>> + */
>> +
>> + addr = pageaddr << dataflash->page_offset;
>> +
>> + /* (1) Maybe transfer partial page to Buffer1 */
>> + if (writelen != spi_flash->page_size) {
>> + command[0] = OP_TRANSFER_BUF1;
>> + command[1] = (addr & 0x00FF0000) >> 16;
>> + command[2] = (addr & 0x0000FF00) >> 8;
>> + command[3] = 0;
>> +
>> + debug("TRANSFER: (%x) %x %x %x\n",
>> + command[0], command[1], command[2],
>> command[3]);
>> +
>> + status = spi_flash_cmd_write(spi, command, 4, NULL,
>> 0);
>> + if (status < 0) {
>> + debug("%s: write(<pagesize) command
>> error!\n",
>> + dev->name);
>> + return -EIO;
>> + }
>> +
>> + status = dataflash_waitready(spi);
>> + if (status < 0) {
>> + debug("%s: write(<pagesize) waitready
>> error!\n",
>> + dev->name);
>> + return status;
>> + }
>> + }
>> +
>> + /* (2) Program full page via Buffer1 */
>> + addr += to;
>> + command[0] = OP_PROGRAM_VIA_BUF1;
>> + command[1] = (addr & 0x00FF0000) >> 16;
>> + command[2] = (addr & 0x0000FF00) >> 8;
>> + command[3] = (addr & 0x000000FF);
>> +
>> + debug("PROGRAM: (%x) %x %x %x\n",
>> + command[0], command[1], command[2], command[3]);
>> +
>> + status = spi_flash_cmd_write(spi, command,
>> + 4, writebuf, writelen);
>> + if (status < 0) {
>> + debug("%s: write send command error!\n", dev->name);
>> + return -EIO;
>> + }
>> +
>> + status = dataflash_waitready(spi);
>> + if (status < 0) {
>> + debug("%s: write waitready error!\n", dev->name);
>> + return status;
>> + }
>> +
>> +#ifdef CONFIG_SPI_DATAFLASH_WRITE_VERIFY
>> + /* (3) Compare to Buffer1 */
>> + addr = pageaddr << dataflash->page_offset;
>> + command[0] = OP_COMPARE_BUF1;
>> + command[1] = (addr & 0x00FF0000) >> 16;
>> + command[2] = (addr & 0x0000FF00) >> 8;
>> + command[3] = 0;
>> +
>> + debug("COMPARE: (%x) %x %x %x\n",
>> + command[0], command[1], command[2], command[3]);
>> +
>> + status = spi_flash_cmd_write(spi, command,
>> + 4, writebuf, writelen);
>> + if (status < 0) {
>> + debug("%s: write(compare) send command error!\n",
>> + dev->name);
>> + return -EIO;
>> + }
>> +
>> + status = dataflash_waitready(spi);
>> +
>> + /* Check result of the compare operation */
>> + if (status & (1 << 6)) {
>> + printf("SPI DataFlash: write compare page %u, err
>> %d\n",
>> + pageaddr, status);
>> + remaining = 0;
>> + status = -EIO;
>> + break;
>> + } else {
>> + status = 0;
>> + }
>> +
>> +#endif /* CONFIG_SPI_DATAFLASH_WRITE_VERIFY */
>> + remaining = remaining - writelen;
>> + pageaddr++;
>> + to = 0;
>> + writebuf += writelen;
>> +
>> + if (remaining > spi_flash->page_size)
>> + writelen = spi_flash->page_size;
>> + else
>> + writelen = remaining;
>> + }
>> +
>> + spi_release_bus(spi);
>> +
>> + return 0;
>> +}
>> +
>> +static int add_dataflash(struct udevice *dev, char *name, int nr_pages,
>> + int pagesize, int pageoffset, char revision)
>> +{
>> + struct spi_flash *spi_flash;
>> + struct dataflash *dataflash;
>> +
>> + dataflash = dev->priv;
>> + spi_flash = dev->uclass_priv;
>> +
>> + dataflash->page_offset = pageoffset;
>> +
>> + spi_flash->name = name;
>> + spi_flash->page_size = pagesize;
>> + spi_flash->size = nr_pages * pagesize;
>> + spi_flash->erase_size = pagesize;
>> +
>> +#ifndef CONFIG_SPL_BUILD
>> + printf("SPI DataFlash: Detected %s with page size ",
>> spi_flash->name);
>> + print_size(spi_flash->page_size, ", erase size ");
>> + print_size(spi_flash->erase_size, ", total ");
>> + print_size(spi_flash->size, "");
>> + printf(", revision %c", revision);
>> + puts("\n");
>> +#endif
>> +
>> + return 0;
>> +}
>> +
>> +struct flash_info {
>> + char *name;
>> +
>> + /*
>> + * JEDEC id has a high byte of zero plus three data bytes:
>> + * the manufacturer id, then a two byte device id.
>> + */
>> + uint32_t jedec_id;
>> +
>> + /* The size listed here is what works with OP_ERASE_PAGE. */
>> + unsigned nr_pages;
>> + uint16_t pagesize;
>> + uint16_t pageoffset;
>> +
>> + uint16_t flags;
>> +#define SUP_POW2PS 0x0002 /* supports 2^N byte pages */
>> +#define IS_POW2PS 0x0001 /* uses 2^N byte pages */
>> +};
>> +
>> +static struct flash_info dataflash_data[] = {
>> + /*
>> + * NOTE: chips with SUP_POW2PS (rev D and up) need two entries,
>> + * one with IS_POW2PS and the other without. The entry with the
>> + * non-2^N byte page size can't name exact chip revisions without
>> + * losing backwards compatibility for cmdlinepart.
>> + *
>> + * These newer chips also support 128-byte security registers (with
>> + * 64 bytes one-time-programmable) and software write-protection.
>> + */
>> + { "AT45DB011B", 0x1f2200, 512, 264, 9, SUP_POW2PS},
>> + { "at45db011d", 0x1f2200, 512, 256, 8, SUP_POW2PS | IS_POW2PS},
>
> Why is one in upper case and one lower case? Perhaps add a comment about this?
I just want to show the difference obviously between chips with normal
2^N bytes page-size and chips with dataflash special page-size through
their names.
I will add below comment:
/*
* Those two entries have different name spelling format in order to
* show their difference obviously.
* The upper case refer to the chip isn't in normal 2^N bytes page-size
* mode.
* The lower case refer to the chip is in normal 2^N bytes page-size
* mode.
*/
Best regards,
Wang Haikun
>
>> +
>> + { "AT45DB021B", 0x1f2300, 1024, 264, 9, SUP_POW2PS},
>> + { "at45db021d", 0x1f2300, 1024, 256, 8, SUP_POW2PS | IS_POW2PS},
>> +
>> + { "AT45DB041x", 0x1f2400, 2048, 264, 9, SUP_POW2PS},
>> + { "at45db041d", 0x1f2400, 2048, 256, 8, SUP_POW2PS | IS_POW2PS},
>> +
>> + { "AT45DB081B", 0x1f2500, 4096, 264, 9, SUP_POW2PS},
>> + { "at45db081d", 0x1f2500, 4096, 256, 8, SUP_POW2PS | IS_POW2PS},
>> +
>> + { "AT45DB161x", 0x1f2600, 4096, 528, 10, SUP_POW2PS},
>> + { "at45db161d", 0x1f2600, 4096, 512, 9, SUP_POW2PS | IS_POW2PS},
>> +
>> + { "AT45DB321x", 0x1f2700, 8192, 528, 10, 0}, /* rev C */
>> +
>> + { "AT45DB321x", 0x1f2701, 8192, 528, 10, SUP_POW2PS},
>> + { "at45db321d", 0x1f2701, 8192, 512, 9, SUP_POW2PS | IS_POW2PS},
>> +
>> + { "AT45DB642x", 0x1f2800, 8192, 1056, 11, SUP_POW2PS},
>> + { "at45db642d", 0x1f2800, 8192, 1024, 10, SUP_POW2PS | IS_POW2PS},
>> +};
>> +
>> +static struct flash_info *jedec_probe(struct spi_slave *spi, u8 *id)
>> +{
>> + int tmp;
>> + uint32_t jedec;
>> + struct flash_info *info;
>> + int status;
>> +
>> + /*
>> + * JEDEC also defines an optional "extended device information"
>> + * string for after vendor-specific data, after the three bytes
>> + * we use here. Supporting some chips might require using it.
>> + *
>> + * If the vendor ID isn't Atmel's (0x1f), assume this call failed.
>> + * That's not an error; only rev C and newer chips handle it, and
>> + * only Atmel sells these chips.
>> + */
>> + if (id[0] != 0x1f)
>> + return NULL;
>> +
>> + jedec = id[0];
>> + jedec = jedec << 8;
>> + jedec |= id[1];
>> + jedec = jedec << 8;
>> + jedec |= id[2];
>> +
>> + for (tmp = 0, info = dataflash_data;
>> + tmp < ARRAY_SIZE(dataflash_data);
>> + tmp++, info++) {
>> + if (info->jedec_id == jedec) {
>> + if (info->flags & SUP_POW2PS) {
>> + status = dataflash_status(spi);
>> + if (status < 0) {
>> + debug("SPI DataFlash: status error
>> %d\n",
>> + status);
>> + return NULL;
>> + }
>> + if (status & 0x1) {
>> + if (info->flags & IS_POW2PS)
>> + return info;
>> + } else {
>> + if (!(info->flags & IS_POW2PS))
>> + return info;
>> + }
>> + } else {
>> + return info;
>> + }
>> + }
>> + }
>> +
>> + /*
>> + * Treat other chips as errors ... we won't know the right page
>> + * size (it might be binary) even when we can tell which density
>> + * class is involved (legacy chip id scheme).
>> + */
>> + printf("SPI DataFlash: Unsupported flash IDs: ");
>> + printf("manuf %02x, jedec %04x, ext_jedec %04x\n",
>> + id[0], jedec, id[3] << 8 | id[4]);
>> + return NULL;
>> +}
>> +
>> +/*
>> + * Detect and initialize DataFlash device, using JEDEC IDs on newer chips
>> + * or else the ID code embedded in the status bits:
>> + *
>> + * Device Density ID code #Pages PageSize Offset
>> + * AT45DB011B 1Mbit (128K) xx0011xx (0x0c) 512 264 9
>> + * AT45DB021B 2Mbit (256K) xx0101xx (0x14) 1024 264 9
>> + * AT45DB041B 4Mbit (512K) xx0111xx (0x1c) 2048 264 9
>> + * AT45DB081B 8Mbit (1M) xx1001xx (0x24) 4096 264 9
>> + * AT45DB0161B 16Mbit (2M) xx1011xx (0x2c) 4096 528 10
>> + * AT45DB0321B 32Mbit (4M) xx1101xx (0x34) 8192 528 10
>> + * AT45DB0642 64Mbit (8M) xx111xxx (0x3c) 8192 1056 11
>> + * AT45DB1282 128Mbit (16M) xx0100xx (0x10) 16384 1056 11
>> + */
>> +static int spi_dataflash_probe(struct udevice *dev)
>> +{
>> + struct spi_slave *spi = dev_get_parentdata(dev);
>> + struct spi_flash *spi_flash;
>> + struct flash_info *info;
>> + u8 idcode[5];
>> + int ret, status = 0;
>> +
>> + spi_flash = dev->uclass_priv;
>> + spi_flash->dev = dev;
>> +
>> + ret = spi_claim_bus(spi);
>> + if (ret)
>> + return ret;
>> +
>> + ret = spi_flash_cmd(spi, CMD_READ_ID, idcode, sizeof(idcode));
>> + if (ret) {
>> + printf("SPI DataFlash: Failed to get idcodes\n");
>> + goto err_read_cmd;
>> + }
>> +
>> + /*
>> + * Try to detect dataflash by JEDEC ID.
>> + * If it succeeds we know we have either a C or D part.
>> + * D will support power of 2 pagesize option.
>> + * Both support the security register, though with different
>> + * write procedures.
>> + */
>> + info = jedec_probe(spi, idcode);
>> + if (info != NULL)
>> + add_dataflash(dev, info->name, info->nr_pages,
>> + info->pagesize, info->pageoffset,
>> + (info->flags & SUP_POW2PS) ? 'd' : 'c');
>> + else {
>> + /*
>> + * Older chips support only legacy commands, identifing
>> + * capacity using bits in the status byte.
>> + */
>> + status = dataflash_status(spi);
>> + if (status <= 0 || status == 0xff) {
>> + printf("SPI DataFlash: read status error %d\n",
>> status);
>> + if (status == 0 || status == 0xff)
>> + status = -ENODEV;
>> + goto err_read_cmd;
>> + }
>> + /*
>> + * if there's a device there, assume it's dataflash.
>> + * board setup should have set spi->max_speed_max to
>> + * match f(car) for continuous reads, mode 0 or 3.
>> + */
>> + switch (status & 0x3c) {
>> + case 0x0c: /* 0 0 1 1 x x */
>> + status = add_dataflash(dev, "AT45DB011B",
>> + 512, 264, 9, 0);
>> + break;
>> + case 0x14: /* 0 1 0 1 x x */
>> + status = add_dataflash(dev, "AT45DB021B",
>> + 1024, 264, 9, 0);
>> + break;
>> + case 0x1c: /* 0 1 1 1 x x */
>> + status = add_dataflash(dev, "AT45DB041x",
>> + 2048, 264, 9, 0);
>> + break;
>> + case 0x24: /* 1 0 0 1 x x */
>> + status = add_dataflash(dev, "AT45DB081B",
>> + 4096, 264, 9, 0);
>> + break;
>> + case 0x2c: /* 1 0 1 1 x x */
>> + status = add_dataflash(dev, "AT45DB161x",
>> + 4096, 528, 10, 0);
>> + break;
>> + case 0x34: /* 1 1 0 1 x x */
>> + status = add_dataflash(dev, "AT45DB321x",
>> + 8192, 528, 10, 0);
>> + break;
>> + case 0x38: /* 1 1 1 x x x */
>> + case 0x3c:
>> + status = add_dataflash(dev, "AT45DB642x",
>> + 8192, 1056, 11, 0);
>> + break;
>> + /* obsolete AT45DB1282 not (yet?) supported */
>> + default:
>> + dev_info(&spi->dev, "unsupported device (%x)\n",
>> + status & 0x3c);
>> + status = -ENODEV;
>> + goto err_read_cmd;
>> + }
>> + }
>> +
>> + /* Assign spi data */
>> + spi_flash->spi = spi;
>> + spi_flash->memory_map = spi->memory_map;
>> + spi_flash->dual_flash = spi->option;
>> +
>> + spi_release_bus(spi);
>> +
>> + return 0;
>> +
>> +err_read_cmd:
>> + spi_release_bus(spi);
>> +
>> + return status;
>> +}
>> +
>> +static const struct dm_spi_flash_ops spi_dataflash_ops = {
>> + .read = spi_dataflash_read,
>> + .write = spi_dataflash_write,
>> + .erase = spi_dataflash_erase,
>> +};
>> +
>> +static const struct udevice_id spi_dataflash_ids[] = {
>> + { .compatible = "atmel,at45", },
>> + { .compatible = "atmel,dataflash", },
>> + { }
>> +};
>> +
>> +U_BOOT_DRIVER(spi_dataflash) = {
>> + .name = "mtd_dataflash",
>> + .id = UCLASS_SPI_FLASH,
>> + .of_match = spi_dataflash_ids,
>> + .probe = spi_dataflash_probe,
>> + .priv_auto_alloc_size = sizeof(struct dataflash),
>> + .ops = &spi_dataflash_ops,
>> +};
>> --
>> 2.1.0.27.g96db324
>>
>
> Regards,
> Simon
>
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