Hi Heiko,
> Maybe a way to go ... more comments?
>
> Below a patch, which introduces a function, which checks for
> "protection bugfixes", and if no bugfix is found the old code is
> executed. Just a fast RFC patch.
>
> bye,
> Heiko
>
> diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c
> index dd394a8..9d3fdcc 100644
> --- a/drivers/mtd/cfi_flash.c
> +++ b/drivers/mtd/cfi_flash.c
> @@ -1376,6 +1376,38 @@ int write_buff (flash_info_t * info, uchar * src,
> ulong addr, ulong cnt)
> */
> #ifdef CONFIG_SYS_FLASH_PROTECTION
>
> +static int cfi_protect_bugfix(flash_info_t * info, long sector, int prot)
> +{
> + if ((info->manufacturer_id == 0x89) && (info->device_id == 0x8922)) {
> + /*
> + * see errata called
> + * "Numonyx Axcell P33/P30 Specification Update" :)
> + */
> + flash_write_cmd (info, sector, 0, FLASH_CMD_READ_ID);
> + if (!flash_isequal (info, sector, FLASH_OFFSET_PROTECT,
> + prot)) {
> + /*
> + * cmd must come before FLASH_CMD_PROTECT + 20us
> + * Disable interrupts which might cause a timeout here.
> + */
> + int flag = disable_interrupts ();
> + unsigned short cmd;
> + if (prot)
> + cmd = FLASH_CMD_PROTECT_SET;
> + else
> + cmd = FLASH_CMD_PROTECT_CLEAR;
> + flash_write_cmd (info, sector, 0,
> + FLASH_CMD_PROTECT);
> + flash_write_cmd (info, sector, 0, cmd);
> + /* re-enable interrupts if necessary */
> + if (flag)
> + enable_interrupts ();
> + }
> + return 1;
> + }
> + return 0;
> +}
> +
> int flash_real_protect (flash_info_t * info, long sector, int prot)
> {
> int retcode = 0;
> @@ -1384,31 +1416,18 @@ int flash_real_protect (flash_info_t * info, long
> sector, int prot)
> case CFI_CMDSET_INTEL_PROG_REGIONS:
> case CFI_CMDSET_INTEL_STANDARD:
> case CFI_CMDSET_INTEL_EXTENDED:
> - /*
> - * see errata called
> - * "Numonyx Axcell P33/P30 Specification Update" :)
> - */
> - flash_write_cmd (info, sector, 0, FLASH_CMD_READ_ID);
> - if (!flash_isequal (info, sector, FLASH_OFFSET_PROTECT,
> - prot)) {
> - /*
> - * cmd must come before FLASH_CMD_PROTECT + 20us
> - * Disable interrupts which might cause a
> timeout here.
> - */
> - int flag = disable_interrupts ();
> - unsigned short cmd;
> -
> + if (!cfi_protect_bugfix(info, sector, prot)) {
> + flash_write_cmd (info, sector, 0,
> + FLASH_CMD_CLEAR_STATUS);
> + flash_write_cmd (info, sector, 0,
> + FLASH_CMD_PROTECT);
> if (prot)
> - cmd = FLASH_CMD_PROTECT_SET;
> + flash_write_cmd (info, sector, 0,
> + FLASH_CMD_PROTECT_SET);
> else
> - cmd = FLASH_CMD_PROTECT_CLEAR;
> + flash_write_cmd (info, sector, 0,
> + FLASH_CMD_PROTECT_CLEAR);
>
> - flash_write_cmd (info, sector, 0,
> - FLASH_CMD_PROTECT);
> - flash_write_cmd (info, sector, 0, cmd);
> - /* re-enable interrupts if necessary */
> - if (flag)
> - enable_interrupts ();
> }
> break;
> case CFI_CMDSET_AMD_EXTENDED:
Can't we introduce a field "chip_quirk" in flash_info_t, and upon flash
enumeration check for the specific chip version and for example put a
CFI_QUIRK_PROTECT in it for this chip. The core code can then check for
this flag and call functions appropriately.
In other words, why not introduce a generic infrastructure for handling
chip quirks that may need different handling for other functions also.
Cheers
Detlev
--
Programming X-Windows is like trying to find the square root of pi
using roman numerals.
-- The UNIX Haters Handbook
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