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author | Linus Torvalds <torvalds@linux-foundation.org> | 2021-04-29 11:28:08 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-04-29 11:28:08 -0700 |
commit | 77d51337d650086643e1e96b8a7e1e6cbf0b09ff (patch) | |
tree | 9aae3449eaa5fd3a280b0e95eaab7ad172536b2c /drivers/firmware | |
parent | 3644286f6cbcea86f6fa4d308e7ac06bf2a3715a (diff) | |
parent | 7e9be673cb1b0be0f4279a960c2ecb28a147c327 (diff) | |
download | linux-77d51337d650086643e1e96b8a7e1e6cbf0b09ff.tar.bz2 |
Merge tag 'mips_5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux
Pull MIPS updates from Thomas Bogendoerfer:
- removed get_fs/set_fs
- removed broken/unmaintained MIPS KVM trap and emulate support
- added support for Loongson-2K1000
- fixes and cleanups
* tag 'mips_5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux: (107 commits)
MIPS: BCM63XX: Use BUG_ON instead of condition followed by BUG.
MIPS: select ARCH_KEEP_MEMBLOCK unconditionally
mips: Do not include hi and lo in clobber list for R6
MIPS:DTS:Correct the license for Loongson-2K
MIPS:DTS:Fix label name and interrupt number of ohci for Loongson-2K
MIPS: Avoid handcoded DIVU in `__div64_32' altogether
lib/math/test_div64: Correct the spelling of "dividend"
lib/math/test_div64: Fix error message formatting
mips/bootinfo:correct some comments of fw_arg
MIPS: Avoid DIVU in `__div64_32' is result would be zero
MIPS: Reinstate platform `__div64_32' handler
div64: Correct inline documentation for `do_div'
lib/math: Add a `do_div' test module
MIPS: Makefile: Replace -pg with CC_FLAGS_FTRACE
MIPS: pci-legacy: revert "use generic pci_enable_resources"
MIPS: Loongson64: Add kexec/kdump support
MIPS: pci-legacy: use generic pci_enable_resources
MIPS: pci-legacy: remove busn_resource field
MIPS: pci-legacy: remove redundant info messages
MIPS: pci-legacy: stop using of_pci_range_to_resource
...
Diffstat (limited to 'drivers/firmware')
-rw-r--r-- | drivers/firmware/broadcom/bcm47xx_nvram.c | 92 |
1 files changed, 47 insertions, 45 deletions
diff --git a/drivers/firmware/broadcom/bcm47xx_nvram.c b/drivers/firmware/broadcom/bcm47xx_nvram.c index 835ece9c00f1..bd235833b687 100644 --- a/drivers/firmware/broadcom/bcm47xx_nvram.c +++ b/drivers/firmware/broadcom/bcm47xx_nvram.c @@ -34,26 +34,46 @@ static char nvram_buf[NVRAM_SPACE]; static size_t nvram_len; static const u32 nvram_sizes[] = {0x6000, 0x8000, 0xF000, 0x10000}; -static u32 find_nvram_size(void __iomem *end) +/** + * bcm47xx_nvram_is_valid - check for a valid NVRAM at specified memory + */ +static bool bcm47xx_nvram_is_valid(void __iomem *nvram) { - struct nvram_header __iomem *header; - int i; + return ((struct nvram_header *)nvram)->magic == NVRAM_MAGIC; +} + +/** + * bcm47xx_nvram_copy - copy NVRAM to internal buffer + */ +static void bcm47xx_nvram_copy(void __iomem *nvram_start, size_t res_size) +{ + struct nvram_header __iomem *header = nvram_start; + size_t copy_size; - for (i = 0; i < ARRAY_SIZE(nvram_sizes); i++) { - header = (struct nvram_header *)(end - nvram_sizes[i]); - if (header->magic == NVRAM_MAGIC) - return nvram_sizes[i]; + copy_size = header->len; + if (copy_size > res_size) { + pr_err("The nvram size according to the header seems to be bigger than the partition on flash\n"); + copy_size = res_size; + } + if (copy_size >= NVRAM_SPACE) { + pr_err("nvram on flash (%zu bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n", + copy_size, NVRAM_SPACE - 1); + copy_size = NVRAM_SPACE - 1; } - return 0; + __ioread32_copy(nvram_buf, nvram_start, DIV_ROUND_UP(copy_size, 4)); + nvram_buf[NVRAM_SPACE - 1] = '\0'; + nvram_len = copy_size; } -/* Probe for NVRAM header */ -static int nvram_find_and_copy(void __iomem *iobase, u32 lim) +/** + * bcm47xx_nvram_find_and_copy - find NVRAM on flash mapping & copy it + */ +static int bcm47xx_nvram_find_and_copy(void __iomem *flash_start, size_t res_size) { - struct nvram_header __iomem *header; - u32 off; - u32 size; + size_t flash_size; + size_t offset; + int i; if (nvram_len) { pr_warn("nvram already initialized\n"); @@ -61,49 +81,31 @@ static int nvram_find_and_copy(void __iomem *iobase, u32 lim) } /* TODO: when nvram is on nand flash check for bad blocks first. */ - off = FLASH_MIN; - while (off <= lim) { - /* Windowed flash access */ - size = find_nvram_size(iobase + off); - if (size) { - header = (struct nvram_header *)(iobase + off - size); - goto found; + + /* Try every possible flash size and check for NVRAM at its end */ + for (flash_size = FLASH_MIN; flash_size <= res_size; flash_size <<= 1) { + for (i = 0; i < ARRAY_SIZE(nvram_sizes); i++) { + offset = flash_size - nvram_sizes[i]; + if (bcm47xx_nvram_is_valid(flash_start + offset)) + goto found; } - off <<= 1; } /* Try embedded NVRAM at 4 KB and 1 KB as last resorts */ - header = (struct nvram_header *)(iobase + 4096); - if (header->magic == NVRAM_MAGIC) { - size = NVRAM_SPACE; + + offset = 4096; + if (bcm47xx_nvram_is_valid(flash_start + offset)) goto found; - } - header = (struct nvram_header *)(iobase + 1024); - if (header->magic == NVRAM_MAGIC) { - size = NVRAM_SPACE; + offset = 1024; + if (bcm47xx_nvram_is_valid(flash_start + offset)) goto found; - } pr_err("no nvram found\n"); return -ENXIO; found: - __ioread32_copy(nvram_buf, header, sizeof(*header) / 4); - nvram_len = ((struct nvram_header *)(nvram_buf))->len; - if (nvram_len > size) { - pr_err("The nvram size according to the header seems to be bigger than the partition on flash\n"); - nvram_len = size; - } - if (nvram_len >= NVRAM_SPACE) { - pr_err("nvram on flash (%zu bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n", - nvram_len, NVRAM_SPACE - 1); - nvram_len = NVRAM_SPACE - 1; - } - /* proceed reading data after header */ - __ioread32_copy(nvram_buf + sizeof(*header), header + 1, - DIV_ROUND_UP(nvram_len, 4)); - nvram_buf[NVRAM_SPACE - 1] = '\0'; + bcm47xx_nvram_copy(flash_start + offset, res_size - offset); return 0; } @@ -124,7 +126,7 @@ int bcm47xx_nvram_init_from_mem(u32 base, u32 lim) if (!iobase) return -ENOMEM; - err = nvram_find_and_copy(iobase, lim); + err = bcm47xx_nvram_find_and_copy(iobase, lim); iounmap(iobase); |