[U-Boot] [PATCH] Fix CFI flash driver for 8-bit bus support
Rogan Dawes
rogan at dawes.za.net
Sat Apr 2 21:37:03 CEST 2011
On 2011/04/02 1:23 PM, Albert ARIBAUD wrote:
> Hi Aaron,
>
> Le 02/04/2011 09:17, Aaron Williams a écrit :
>> This patch corrects the addresses used when working with Spansion/AMD FLASH chips.
>> Addressing for 8 and 16 bits is almost identical except in the 16-bit case the
>> LSB of the address is always 0. The confusion arose because the addresses
>> in the datasheet for 16-bit mode are word addresses but this code assumed it was
>> byte addresses.
>>
>> I have only been able to test this on our Octeon boards which use either an 8-bit
>> or 16-bit bus. I have not tested the case where there's an 8-bit part on a 16-bit
>> bus.
>>
>> This patch also adds some delays as suggested by Spansion.
>>
>> If a part can be both 8 and 16-bits, it forces it to work in 8-bit mode if an
>> 8-bit bus is detected.
>>
>> -Aaron Williams
>>
>>
>> Signed-off-by: Aaron Williams<aaron.williams at caviumnetworks.com>
>
> Comments related to testing and 'signatures' should not be part of the
> commit message and thus should go below the commit message delimiter.
>
>> ---
>> drivers/mtd/cfi_flash.c | 93 ++++++++++++++++++++++++++++++++++-------------
>> include/mtd/cfi_flash.h | 40 ++++++++++----------
>> 2 files changed, 87 insertions(+), 46 deletions(-)
>>
>> diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c
>> index 0909fe7..eab1fbe 100644
>> --- a/drivers/mtd/cfi_flash.c
>> +++ b/drivers/mtd/cfi_flash.c
>> @@ -10,6 +10,9 @@
>> *
>> * Copyright (C) 2006
>> * Tolunay Orkun<listmember at orkun.us>
>> + *
>
> There is a space between the asterisk and end of line. You can check if
> your patch is whitespace-clean by applying it locally as if you were
> another u-boot user; 'git apply' will tell you where in the patch there
> are undue whitespace.
>
>> + * Copyright (C) 2011 Cavium Networks, Inc.
>> + * Aaron Williams<Aaron.Williams at caviumnetworks.com>
>> *
>> * See file CREDITS for list of people who contributed to this
>> * project.
>> @@ -32,7 +35,6 @@
>> */
>>
>> /* The DEBUG define must be before common to enable debugging */
>> -/* #define DEBUG */
Not sure why you removed this?
>>
>> #include<common.h>
>> #include<asm/processor.h>
>> @@ -209,9 +211,11 @@ unsigned long flash_sector_size(flash_info_t *info, flash_sect_t sect)
>> static inline void *
>> flash_map (flash_info_t * info, flash_sect_t sect, uint offset)
>> {
>> - unsigned int byte_offset = offset * info->portwidth;
>> -
>
> Whitespace (see 'git apply' comment above).
>
>> - return (void *)(info->start[sect] + byte_offset);
>> + unsigned int byte_offset = offset * info->portwidth / info->chipwidth;
>> + unsigned int addr = (info->start[sect] + byte_offset);
>> + unsigned int mask = 0xffffffff<< (info->portwidth - 1);
>> +
>> + return (void *)(addr& mask);
>> }
>>
>> static inline void flash_unmap(flash_info_t *info, flash_sect_t sect,
>> @@ -397,6 +401,8 @@ void flash_write_cmd (flash_info_t * info, flash_sect_t sect,
>> #endif
>> flash_write64(cword.ll, addr);
>> break;
>> + default:
>> + debug ("fwc: Unknown port width %d\n", info->portwidth);
>> }
>>
>> /* Ensure all the instructions are fully finished */
>> @@ -581,6 +587,7 @@ static int flash_status_check (flash_info_t * info, flash_sect_t sector,
>> prompt, info->start[sector],
>> flash_read_long (info, sector, 0));
>> flash_write_cmd (info, sector, 0, info->cmd_reset);
>> + udelay(1);
>> return ERR_TIMOUT;
Is there a point to introducing a delay if you are already returning a
timeout error?
>> }
>> udelay (1); /* also triggers watchdog */
>> @@ -628,6 +635,7 @@ static int flash_full_status_check (flash_info_t * info, flash_sect_t sector,
>> puts ("Vpp Low Error.\n");
>> }
>> flash_write_cmd (info, sector, 0, info->cmd_reset);
>> + udelay(1);
>> break;
>> default:
>> break;
>> @@ -744,12 +752,8 @@ static void flash_add_byte (flash_info_t * info, cfiword_t * cword, uchar c)
>> static flash_sect_t find_sector (flash_info_t * info, ulong addr)
>> {
>> static flash_sect_t saved_sector = 0; /* previously found sector */
>> - static flash_info_t *saved_info = 0; /* previously used flash bank */
>> flash_sect_t sector = saved_sector;
>>
>> - if ((info != saved_info) || (sector>= info->sector_count))
>> - sector = 0;
>> -
>> while ((info->start[sector]< addr)
>> && (sector< info->sector_count - 1))
>> sector++;
>> @@ -761,7 +765,6 @@ static flash_sect_t find_sector (flash_info_t * info, ulong addr)
>> sector--;
>>
>> saved_sector = sector;
>> - saved_info = info;
>> return sector;
>> }
>>
>> @@ -825,12 +828,15 @@ static int flash_write_cfiword (flash_info_t * info, ulong dest,
>>
>> switch (info->portwidth) {
>> case FLASH_CFI_8BIT:
>> + debug("%s: 8-bit 0x%02x\n", __func__, cword.c);
>> flash_write8(cword.c, dstaddr);
>> break;
>> case FLASH_CFI_16BIT:
>> + debug("%s: 16-bit 0x%04x\n", __func__, cword.w);
>> flash_write16(cword.w, dstaddr);
>> break;
>> case FLASH_CFI_32BIT:
>> + debug("%s: 32-bit 0x%08lx\n", __func__, cword.l);
>> flash_write32(cword.l, dstaddr);
>> break;
>> case FLASH_CFI_64BIT:
>> @@ -1043,6 +1049,8 @@ int flash_erase (flash_info_t * info, int s_first, int s_last)
>> int prot;
>> flash_sect_t sect;
>> int st;
>> +
>
> Whitespace (see 'git apply' comment above).
>
>> + debug("%s: erasing sectors %d to %d\n", __func__, s_first, s_last);
>>
>> if (info->flash_id != FLASH_MAN_CFI) {
>> puts ("Can't erase unknown flash type - aborted\n");
>> @@ -1082,6 +1090,7 @@ int flash_erase (flash_info_t * info, int s_first, int s_last)
>> break;
>> case CFI_CMDSET_AMD_STANDARD:
>> case CFI_CMDSET_AMD_EXTENDED:
>> + flash_write_cmd (info, 0, 0, AMD_CMD_RESET);
>> flash_unlock_seq (info, sect);
>> flash_write_cmd (info, sect,
>> info->addr_unlock1,
>> @@ -1121,6 +1130,8 @@ int flash_erase (flash_info_t * info, int s_first, int s_last)
>> rcode = 1;
>> else if (flash_verbose)
>> putc ('.');
>> + } else {
>> + debug("\nSector %d is protected.\n", sect);
>> }
>> }
>>
>> @@ -1490,6 +1501,7 @@ void flash_read_user_serial (flash_info_t * info, void *buffer, int offset,
>> flash_write_cmd (info, 0, 0, FLASH_CMD_READ_ID);
>> memcpy (dst, src + offset, len);
>> flash_write_cmd (info, 0, 0, info->cmd_reset);
>> + udelay(1);
>> flash_unmap(info, 0, FLASH_OFFSET_USER_PROTECTION, src);
>> }
>>
>> @@ -1505,6 +1517,7 @@ void flash_read_factory_serial (flash_info_t * info, void *buffer, int offset,
>> flash_write_cmd (info, 0, 0, FLASH_CMD_READ_ID);
>> memcpy (buffer, src + offset, len);
>> flash_write_cmd (info, 0, 0, info->cmd_reset);
>> + udelay(1);
>> flash_unmap(info, 0, FLASH_OFFSET_INTEL_PROTECTION, src);
>> }
>>
>> @@ -1536,6 +1549,7 @@ static void cfi_reverse_geometry(struct cfi_qry *qry)
>> static void cmdset_intel_read_jedec_ids(flash_info_t *info)
>> {
>> flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
>> + udelay(1);
>> flash_write_cmd(info, 0, 0, FLASH_CMD_READ_ID);
>> udelay(1000); /* some flash are slow to respond */
>> info->manufacturer_id = flash_read_uchar (info,
>> @@ -1573,8 +1587,7 @@ static void cmdset_amd_read_jedec_ids(flash_info_t *info)
>> flash_unlock_seq(info, 0);
>> flash_write_cmd(info, 0, info->addr_unlock1, FLASH_CMD_READ_ID);
>> udelay(1000); /* some flash are slow to respond */
>> -
>> - manuId = flash_read_uchar (info, FLASH_OFFSET_MANUFACTURER_ID);
>> + manuId = flash_read_uchar(info, FLASH_OFFSET_MANUFACTURER_ID);
>> /* JEDEC JEP106Z specifies ID codes up to bank 7 */
>> while (manuId == FLASH_CONTINUATION_CODE&& bankId< 0x800) {
>> bankId += 0x100;
>> @@ -1604,6 +1617,7 @@ static void cmdset_amd_read_jedec_ids(flash_info_t *info)
>> break;
>> }
>> flash_write_cmd(info, 0, 0, AMD_CMD_RESET);
>> + udelay(1);
>> }
>>
>> static int cmdset_amd_init(flash_info_t *info, struct cfi_qry *qry)
>> @@ -1719,7 +1733,7 @@ static void flash_read_cfi (flash_info_t *info, void *buf,
>> unsigned int i;
>>
>> for (i = 0; i< len; i++)
>> - p[i] = flash_read_uchar(info, start + i);
>> + p[i] = flash_read_uchar(info, start + (i * 2));
>
> This "2" seems a bit magical to me -- apparently the semantics of
> flash_read_uchar seem to change with your patch If they do, please add
> comments before the definition of flash_read_uchar() to make the meaning
> of its arguments completely clear.
>
> Besides, does this still work with pure 8 bit devices, where the CFI
> area is byte-spaced?
>
>> }
>>
>> void __flash_cmd_reset(flash_info_t *info)
>> @@ -1730,6 +1744,7 @@ void __flash_cmd_reset(flash_info_t *info)
>> * that AMD flash roms ignore the Intel command.
>> */
>> flash_write_cmd(info, 0, 0, AMD_CMD_RESET);
>> + udelay(1);
>> flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
>> }
>> void flash_cmd_reset(flash_info_t *info)
>> @@ -1739,21 +1754,38 @@ static int __flash_detect_cfi (flash_info_t * info, struct cfi_qry *qry)
>> {
>> int cfi_offset;
>>
>> - /* Issue FLASH reset command */
>> - flash_cmd_reset(info);
>> -
>> for (cfi_offset=0;
>> cfi_offset< sizeof(flash_offset_cfi) / sizeof(uint);
>> cfi_offset++) {
>> + /* Issue FLASH reset command */
>> + flash_cmd_reset(info);
>> flash_write_cmd (info, 0, flash_offset_cfi[cfi_offset],
>> FLASH_CMD_CFI);
>> if (flash_isequal (info, 0, FLASH_OFFSET_CFI_RESP, 'Q')
>> - && flash_isequal (info, 0, FLASH_OFFSET_CFI_RESP + 1, 'R')
>> - && flash_isequal (info, 0, FLASH_OFFSET_CFI_RESP + 2, 'Y')) {
>> + && flash_isequal (info, 0, FLASH_OFFSET_CFI_RESP + 2, 'R')
>> + && flash_isequal (info, 0, FLASH_OFFSET_CFI_RESP + 4, 'Y')) {
>
> Here too, the change requires that the semantics of flash_isequal be
> explicited in a comment before the definition of flash_isequal() to make
> the meaning of its arguments completely clear.
>
>> flash_read_cfi(info, qry, FLASH_OFFSET_CFI_RESP,
>> sizeof(struct cfi_qry));
>> +#ifdef CONFIG_SYS_FLASH_INTERFACE_WIDTH
>> + info->interface = CONFIG_SYS_FLASH_INTERFACE_WIDTH;
>> +#else
>> info->interface = le16_to_cpu(qry->interface_desc);
>> -
>> + /* Some flash chips can support multiple bus widths.
>> + * In this case, override the interface width and
>> + * limit it to the port width.
>> + */
>> + if ((info->interface == FLASH_CFI_X8X16)&&
>> + (info->portwidth == FLASH_CFI_8BIT)) {
>> + debug("Overriding 16-bit interface width to "
>> + " 8-bit port width.\n");
>> + info->interface = FLASH_CFI_X8;
>> + } else if ((info->interface == FLASH_CFI_X16X32)&&
>> + (info->portwidth == FLASH_CFI_16BIT)) {
>> + debug("Overriding 16-bit interface width to "
>> + " 16-bit port width.\n");
>> + info->interface = FLASH_CFI_X16;
>> + }
>> +#endif
>> info->cfi_offset = flash_offset_cfi[cfi_offset];
>> debug ("device interface is %d\n",
>> info->interface);
>> @@ -1764,8 +1796,8 @@ static int __flash_detect_cfi (flash_info_t * info, struct cfi_qry *qry)
>> info->chipwidth<< CFI_FLASH_SHIFT_WIDTH);
>>
>> /* calculate command offsets as in the Linux driver */
>> - info->addr_unlock1 = 0x555;
>> - info->addr_unlock2 = 0x2aa;
>> + info->addr_unlock1 = 0xaaa;
>> + info->addr_unlock2 = 0x555;
>>
>> /*
>> * modify the unlock address if we are
>> @@ -1799,8 +1831,11 @@ static int flash_detect_cfi (flash_info_t * info, struct cfi_qry *qry)
>> for (info->chipwidth = FLASH_CFI_BY8;
>> info->chipwidth<= info->portwidth;
>> info->chipwidth<<= 1)
>> - if (__flash_detect_cfi(info, qry))
>> + if (__flash_detect_cfi(info, qry)) {
>> + debug("Found CFI flash, portwidth %d, chipwidth %d\n",
>> + info->portwidth, info->chipwidth);
>> return 1;
>> + }
>> }
>> debug ("not found\n");
>> return 0;
>> @@ -1819,7 +1854,7 @@ static void flash_fixup_amd(flash_info_t *info, struct cfi_qry *qry)
>> /* CFI< 1.1, try to guess from device id */
>> if ((info->device_id& 0x80) != 0)
>> cfi_reverse_geometry(qry);
>> - } else if (flash_read_uchar(info, info->ext_addr + 0xf) == 3) {
>> + } else if (flash_read_uchar(info, info->ext_addr + 0x1e) == 3) {
>
> Please add comments to explain what the '0x1e' actually means -- that's
> not a fault of your patch, btw, as the 0xf in the original code could
> already have used some commenting; since you're at it, you might as well
> improve on code understandability as well. :)
>
>> /* CFI>= 1.1, deduct from top/bottom flag */
>> /* note: ext_addr is valid since cfi_version> 0 */
>> cfi_reverse_geometry(qry);
>> @@ -1891,14 +1926,15 @@ ulong flash_get_size (phys_addr_t base, int banknum)
>>
>> if (flash_detect_cfi (info,&qry)) {
>> info->vendor = le16_to_cpu(qry.p_id);
>> - info->ext_addr = le16_to_cpu(qry.p_adr);
>> + info->ext_addr = le16_to_cpu(qry.p_adr) * 2;
>> + debug("extended address is 0x%x\n", info->ext_addr);
>> num_erase_regions = qry.num_erase_regions;
>>
>> if (info->ext_addr) {
>> info->cfi_version = (ushort) flash_read_uchar (info,
>> - info->ext_addr + 3)<< 8;
>> + info->ext_addr + 6)<< 8;
>> info->cfi_version |= (ushort) flash_read_uchar (info,
>> - info->ext_addr + 4);
>> + info->ext_addr + 8);
>> }
>
> Same remark re: "magic" for the changes above: tell readers what units
> (bytes, words, something else) these offsets are expressed in.
>
>> #ifdef DEBUG
>> @@ -1945,13 +1981,16 @@ ulong flash_get_size (phys_addr_t base, int banknum)
>> debug ("device id is 0x%x\n", info->device_id);
>> debug ("device id2 is 0x%x\n", info->device_id2);
>> debug ("cfi version is 0x%04x\n", info->cfi_version);
>> -
>> + debug ("port width: %d, chipwidth: %d, interface: %d\n",
>> + info->portwidth, info->chipwidth, info->interface);
>> size_ratio = info->portwidth / info->chipwidth;
>> +#if 0
>> /* if the chip is x8/x16 reduce the ratio by half */
>> if ((info->interface == FLASH_CFI_X8X16)
>> && (info->chipwidth == FLASH_CFI_BY8)) {
>> size_ratio>>= 1;
>> }
>> +#endif
>
> NAK on this one. If you want to remove some code, remove it. If you
> still want it, dont comment it out.
>
>> debug ("size_ratio %d port %d bits chip %d bits\n",
>> size_ratio, info->portwidth<< CFI_FLASH_SHIFT_WIDTH,
>> info->chipwidth<< CFI_FLASH_SHIFT_WIDTH);
>> @@ -2023,6 +2062,8 @@ ulong flash_get_size (phys_addr_t base, int banknum)
>> sect_cnt++;
>> }
>> }
>> + debug ("port width: %d, chipwidth: %d, interface: %d\n",
>> + info->portwidth, info->chipwidth, info->interface);
>>
>> info->sector_count = sect_cnt;
>> info->buffer_size = 1<< le16_to_cpu(qry.max_buf_write_size);
>> diff --git a/include/mtd/cfi_flash.h b/include/mtd/cfi_flash.h
>> index 3245b44..edcf9be 100644
>> --- a/include/mtd/cfi_flash.h
>> +++ b/include/mtd/cfi_flash.h
>
> Overall remark on the .h file: please explain what unit the values are
> expressed in (byte offets, word offsets, width-independent, whatever.
>
>>
>
> Apart from this, I am happy to report that this code works well with my
> ED Mini V2, allowing me to remove the CONFIG_FLASH_CFI_LEGACY config
> option and use the standard driver, so:
>
> Tested-by: Albert ARIBAUD <albert.aribaud at free.fr>
>
> Thanks a lot, Aaron!
>
> Amicalement,
Also tested with the DNS323, this patch allows me to remove the
"horrible hacks" that allowed CFI to work on that board too.
Thanks Aaron!
Rogan
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