[U-Boot] [PATCH 07/11] flash/cfi_flash: Use virtual sector start address, not phys
Kumar Gala
galak at kernel.crashing.org
Wed Jan 14 09:38:37 CET 2009
On Dec 3, 2008, at 11:04 PM, Becky Bruce wrote:
> include/flash.h was commented to say that the address in
> flash_info->start was a physical address. However, from u-boot's
> point of view, and looking at most flash code, it makes more
> sense for this to be a virtual address. So I corrected the
> comment to indicate that this was a virtual address.
>
> The only flash driver that was actually treating the address
> as physical was the mtd/cfi_flash driver. However, this code
> was using it inconsistently as it actually directly dereferenced
> the "start" element, while it used map_physmem to get a
> virtual address in other places. I changed this driver so
> that the code which initializes the info->start field calls
> map_physmem to get a virtual address, eliminating the need for
> further map_physmem calls. The code is now consistent.
>
> The *only* place a physical address should be used is when defining
> the
> flash banks list that is used to initialize the flash_info struct. I
> have fixed the one platform that was impacted by this change
> (MPC8641D).
>
> Signed-off-by: Becky Bruce <beckyb at kernel.crashing.org>
> ---
> drivers/mtd/cfi_flash.c | 53 +++++++++++++++++
> +----------------------
> include/configs/MPC8641HPCN.h | 2 +-
> include/flash.h | 2 +-
> 3 files changed, 26 insertions(+), 31 deletions(-)
Stefan,
Have you reviewed this. I'm not sure if remvoing the map_physmem() is
the right answer because I'm assuming Haavard added them for a reason
(AVR32?). Should we instead change info->start to be a phys_addr_t?
- k
> diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c
> index e8afe99..292cc28 100644
> --- a/drivers/mtd/cfi_flash.c
> +++ b/drivers/mtd/cfi_flash.c
> @@ -305,17 +305,12 @@ flash_map (flash_info_t * info, flash_sect_t
> sect, uint offset)
> {
> unsigned int byte_offset = offset * info->portwidth;
>
> - return map_physmem(info->start[sect] + byte_offset,
> - flash_sector_size(info, sect) - byte_offset,
> - MAP_NOCACHE);
> + return (void *)(info->start[sect] + byte_offset);
> }
>
> static inline void flash_unmap(flash_info_t *info, flash_sect_t sect,
> unsigned int offset, void *addr)
> {
> - unsigned int byte_offset = offset * info->portwidth;
> -
> - unmap_physmem(addr, flash_sector_size(info, sect) - byte_offset);
> }
>
> /
> *-----------------------------------------------------------------------
> @@ -793,12 +788,10 @@ static flash_sect_t find_sector (flash_info_t
> * info, ulong addr)
> static int flash_write_cfiword (flash_info_t * info, ulong dest,
> cfiword_t cword)
> {
> - void *dstaddr;
> + void *dstaddr = (void *)dest;
> int flag;
> flash_sect_t sect;
>
> - dstaddr = map_physmem(dest, info->portwidth, MAP_NOCACHE);
> -
> /* Check if Flash is (sufficiently) erased */
> switch (info->portwidth) {
> case FLASH_CFI_8BIT:
> @@ -817,10 +810,8 @@ static int flash_write_cfiword (flash_info_t *
> info, ulong dest,
> flag = 0;
> break;
> }
> - if (!flag) {
> - unmap_physmem(dstaddr, info->portwidth);
> + if (!flag)
> return ERR_NOT_ERASED;
> - }
>
> /* Disable interrupts which might cause a timeout here */
> flag = disable_interrupts ();
> @@ -862,8 +853,6 @@ static int flash_write_cfiword (flash_info_t *
> info, ulong dest,
> if (flag)
> enable_interrupts ();
>
> - unmap_physmem(dstaddr, info->portwidth);
> -
> return flash_full_status_check (info, find_sector (info, dest),
> info->write_tout, "write");
> }
> @@ -877,7 +866,7 @@ static int flash_write_cfibuffer (flash_info_t *
> info, ulong dest, uchar * cp,
> int cnt;
> int retcode;
> void *src = cp;
> - void *dst = map_physmem(dest, len, MAP_NOCACHE);
> + void *dst = dest;
> void *dst2 = dst;
> int flag = 0;
> uint offset = 0;
> @@ -1039,7 +1028,6 @@ static int flash_write_cfibuffer (flash_info_t
> * info, ulong dest, uchar * cp,
> }
>
> out_unmap:
> - unmap_physmem(dst, len);
> return retcode;
> }
> #endif /* CONFIG_SYS_FLASH_USE_BUFFER_WRITE */
> @@ -1288,7 +1276,7 @@ int write_buff (flash_info_t * info, uchar *
> src, ulong addr, ulong cnt)
> /* handle unaligned start */
> if ((aln = addr - wp) != 0) {
> cword.l = 0;
> - p = map_physmem(wp, info->portwidth, MAP_NOCACHE);
> + p = (uchar *)wp;
> for (i = 0; i < aln; ++i)
> flash_add_byte (info, &cword, flash_read8(p + i));
>
> @@ -1300,7 +1288,6 @@ int write_buff (flash_info_t * info, uchar *
> src, ulong addr, ulong cnt)
> flash_add_byte (info, &cword, flash_read8(p + i));
>
> rc = flash_write_cfiword (info, wp, cword);
> - unmap_physmem(p, info->portwidth);
> if (rc != 0)
> return rc;
>
> @@ -1359,14 +1346,13 @@ int write_buff (flash_info_t * info, uchar *
> src, ulong addr, ulong cnt)
> * handle unaligned tail bytes
> */
> cword.l = 0;
> - p = map_physmem(wp, info->portwidth, MAP_NOCACHE);
> + p = (uchar *)wp;
> for (i = 0; (i < info->portwidth) && (cnt > 0); ++i) {
> flash_add_byte (info, &cword, *src++);
> --cnt;
> }
> for (; i < info->portwidth; ++i)
> flash_add_byte (info, &cword, flash_read8(p + i));
> - unmap_physmem(p, info->portwidth);
>
> return flash_write_cfiword (info, wp, cword);
> }
> @@ -1605,7 +1591,7 @@ static void flash_read_jedec_ids (flash_info_t
> * info)
> * board_flash_get_legacy needs to fill in at least:
> * info->portwidth, info->chipwidth and info->interface for Jedec
> probing.
> */
> -static int flash_detect_legacy(ulong base, int banknum)
> +static int flash_detect_legacy(phys_addr_t base, int banknum)
> {
> flash_info_t *info = &flash_info[banknum];
>
> @@ -1621,7 +1607,10 @@ static int flash_detect_legacy(ulong base,
> int banknum)
>
> for (i = 0; i < sizeof(modes) / sizeof(modes[0]); i++) {
> info->vendor = modes[i];
> - info->start[0] = base;
> + info->start[0] =
> + (ulong)map_physmem(base,
> + info->portwith,
> + MAP_NOCACHE);
> if (info->portwidth == FLASH_CFI_8BIT
> && info->interface == FLASH_CFI_X8X16) {
> info->addr_unlock1 = 0x2AAA;
> @@ -1635,8 +1624,11 @@ static int flash_detect_legacy(ulong base,
> int banknum)
> info->manufacturer_id,
> info->device_id,
> info->device_id2);
> - if (jedec_flash_match(info, base))
> + if (jedec_flash_match(info, info->start[0]))
> break;
> + else
> + unmap_physmem(info->start[0],
> + MAP_NOCACHE);
> }
> }
>
> @@ -1658,7 +1650,7 @@ static int flash_detect_legacy(ulong base, int
> banknum)
> return 0; /* use CFI */
> }
> #else
> -static inline int flash_detect_legacy(ulong base, int banknum)
> +static inline int flash_detect_legacy(phys_addr_t base, int banknum)
> {
> return 0; /* use CFI */
> }
> @@ -1799,12 +1791,12 @@ static void flash_fixup_atmel(flash_info_t
> *info, struct cfi_qry *qry)
> * The following code cannot be run from FLASH!
> *
> */
> -ulong flash_get_size (ulong base, int banknum)
> +ulong flash_get_size (phys_addr_t base, int banknum)
> {
> flash_info_t *info = &flash_info[banknum];
> int i, j;
> flash_sect_t sect_cnt;
> - unsigned long sector;
> + phys_addr_t sector;
> unsigned long tmp;
> int size_ratio;
> uchar num_erase_regions;
> @@ -1820,7 +1812,7 @@ ulong flash_get_size (ulong base, int banknum)
> info->legacy_unlock = 0;
> #endif
>
> - info->start[0] = base;
> + info->start[0] = (ulong)map_physmem(base, info->portwidth,
> MAP_NOCACHE);
>
> if (flash_detect_cfi (info, &qry)) {
> info->vendor = le16_to_cpu(qry.p_id);
> @@ -1909,7 +1901,10 @@ ulong flash_get_size (ulong base, int banknum)
> printf("ERROR: too many flash sectors\n");
> break;
> }
> - info->start[sect_cnt] = sector;
> + info->start[sect_cnt] =
> + (ulong)map_physmem(sector,
> + info->portwidth,
> + MAP_NOCACHE);
> sector += (erase_region_size * size_ratio);
>
> /*
> @@ -1986,7 +1981,7 @@ unsigned long flash_init (void)
> char *s = getenv("unlock");
> #endif
>
> -#define BANK_BASE(i) (((unsigned long
> [CFI_MAX_FLASH_BANKS])CONFIG_SYS_FLASH_BANKS_LIST)[i])
> +#define BANK_BASE(i) (((phys_addr_t
> [CFI_MAX_FLASH_BANKS])CONFIG_SYS_FLASH_BANKS_LIST)[i])
>
> /* Init: no FLASHes known */
> for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
> diff --git a/include/configs/MPC8641HPCN.h b/include/configs/
> MPC8641HPCN.h
> index 69b4c44..c25380b 100644
> --- a/include/configs/MPC8641HPCN.h
> +++ b/include/configs/MPC8641HPCN.h
> @@ -187,7 +187,7 @@ extern unsigned long get_board_sys_clk(unsigned
> long dummy);
> | CONFIG_SYS_PHYS_ADDR_HIGH)
>
>
> -#define CONFIG_SYS_FLASH_BANKS_LIST {CONFIG_SYS_FLASH_BASE}
> +#define CONFIG_SYS_FLASH_BANKS_LIST {CONFIG_SYS_FLASH_BASE_PHYS}
>
> /* Convert an address into the right format for the BR registers */
> #ifdef CONFIG_PHYS_64BIT
> diff --git a/include/flash.h b/include/flash.h
> index 6e2981c..02c6a04 100644
> --- a/include/flash.h
> +++ b/include/flash.h
> @@ -33,7 +33,7 @@ typedef struct {
> ulong size; /* total bank size in bytes */
> ushort sector_count; /* number of erase units */
> ulong flash_id; /* combined device & manufacturer code */
> - ulong start[CONFIG_SYS_MAX_FLASH_SECT]; /* physical sector start
> addresses */
> + ulong start[CONFIG_SYS_MAX_FLASH_SECT]; /* virtual sector start
> address */
> uchar protect[CONFIG_SYS_MAX_FLASH_SECT]; /* sector protection
> status */
> #ifdef CONFIG_SYS_FLASH_CFI
> uchar portwidth; /* the width of the port */
> --
> 1.5.6.5
>
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