[U-Boot] [PATCH v6 1/5] dm: sf: Add Atmel DataFlash spi flash driver
Jagan Teki
jteki at openedev.com
Wed Jul 1 10:00:48 CEST 2015
On 1 July 2015 at 07:27, Wang Haikun <Haikun.Wang at freescale.com> wrote:
> On 6/30/2015 7:24 PM, Jagan Teki wrote:
>> Hi Haikun,
>>
>> On 30 June 2015 at 04:48, Simon Glass <sjg at chromium.org> wrote:
>>> Hi,
>>>
>>> On 26 June 2015 at 05:30, Haikun Wang <haikun.wang at 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.
>>>> Example:
>>>> => sf probe 1:0
>>>> SPI DataFlash: Detected AT45DB021B with page size 264 Bytes, erase size 264 Bytes, total 264 KiB, revision d
>>>> => sf erase 0 42000
>>>> SF: 270336 bytes @ 0x0 Erased: OK
>>>> => mw.l 82000000 45444342 20000
>>>> => sf write 82000000 0 42000
>>>> SF: 270336 bytes @ 0x0 Written: OK
>>>> => sf read 83000000 0 42000
>>>> SF: 270336 bytes @ 0x0 Read: OK
>>>> => cmp.b 82000000 83000000 42000
>>>> Total of 270336 byte(s) were the same
>>>>
>>>> Signed-off-by: Haikun Wang <haikun.wang at freescale.com>
>>>
>>> Reviewed-by: Simon Glass <sjg at chromium.org>
>>>
>>> The driver model stuff looks fine. But see some nits/suggestions below.
>>
>> Can you fix this and send a patch on top of master.
> Hi Jagan,
>
> You want me send a extra patch to fix those issues?
Yes.
>>
>>>
>>>> ---
>>>> Verified with AT45DB021B on LS1021AQDS.
>>>> Changes in v6:
>>>> - Add defconfig patch in this series
>>>>
>>>> Changes in v5:
>>>> - Change CONFIG_DM_SF_DATAFLASH to CONFIG_SF_DATAFLASH
>>>>
>>>> Changes in v4:
>>>> - Use dev_get_priv and dev_get_uclass_priv
>>>> - Add test log to commit message
>>>>
>>>> Changes in v3:
>>>> - 1. Rename file spi_dataflash.c to sf_dataflash.c
>>>> - 2. Add comment for array "dataflash_data"
>>>>
>>>> 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 4 & 5>
>>>>
>>>> Changes in v1: None
>>>> drivers/mtd/spi/Makefile | 1 +
>>>> drivers/mtd/spi/sf_dataflash.c | 711 +++++++++++++++++++++++++++++++++++++++++
>>>> 2 files changed, 712 insertions(+)
>>>> create mode 100644 drivers/mtd/spi/sf_dataflash.c
>>>>
>>>> diff --git a/drivers/mtd/spi/Makefile b/drivers/mtd/spi/Makefile
>>>> index c61b784..87f20bc 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_SF_DATAFLASH) += sf_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/sf_dataflash.c b/drivers/mtd/spi/sf_dataflash.c
>>>> new file mode 100644
>>>> index 0000000..d287db8
>>>> --- /dev/null
>>>> +++ b/drivers/mtd/spi/sf_dataflash.c
>>>> @@ -0,0 +1,711 @@
>>>> +/*
>>>> + *
>>>> + * Atmel DataFlash probing
>>>> + *
>>>> + * Copyright (C) 2004-2009, 2015 Freescale Semiconductor, Inc.
>>>> + * Haikun Wang (haikun.wang at 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 */
>>>> +
>>>
>>> Remove extra blank line here
>>>
>>>> +
>>>> +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)
>>>
>>> Why inline?
>>>
>>>> +{
>>>> + 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_get_priv(dev);
>>>> + spi_flash = dev_get_uclass_priv(dev);
>>>> + 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;
>>>
>>> Don't you want to call spi_release_bus() when you return from this
>>> loop? Maybe a goto?
>>>
>>>> + }
>>>> +
>>>> + 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_get_priv(dev);
>>>> + spi_flash = dev_get_uclass_priv(dev);
>>>> + 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_get_priv(dev);
>>>> + spi_flash = dev_get_uclass_priv(dev);
>>>> + 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;
>>>
>>> Similarly here.
>>>
>>>> + }
>>>> +
>>>> + 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
>>>
>>> Do we need this config? Do you think the API should allow for deciding
>>> whether or not to verify, rather than having it hard-coded?
>>>
>>>> + /* (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_get_priv(dev);
>>>> + spi_flash = dev_get_uclass_priv(dev);
>>>> +
>>>> + 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.
>>>> + *
>>>> + * 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.
>>>> + *
>>>> + * 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},
>>>> +
>>>> + { "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},
>>>> +};
>>>
>>> Perhaps these data structures should all be at the top of the file so
>>> they are together?
>>>
>>>> +
>>>> +static struct flash_info *jedec_probe(struct spi_slave *spi, u8 *id)
>>>
>>> Perhaps this should return an int error code?
>>>
>>>> +{
>>>> + 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_get_uclass_priv(dev);
>>>> + 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);
>>>
>>> Can you not use the info from the dataflash_data array instead of what
>>> looks like repetition here?
>>>
>>>> + break;
>>>> + /* obsolete AT45DB1282 not (yet?) supported */
>>>> + default:
>>>> + dev_info(&spi->dev, "unsupported device (%x)\n",
>>>
>>> Should that be:
>>>
>>> dev_info(spi->dev...
>>>
>>> ?
>>>
>>> Also, U-Boot doesn't implement dev_info() yet. You could perhaps
>>> contribute an implementation.
>>>
>>>> + 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 = "spi_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
thanks!
--
Jagan | openedev.
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