diff options
Diffstat (limited to 'arch/mips/bcm47xx')
| -rw-r--r-- | arch/mips/bcm47xx/sprom.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/mips/bcm47xx/sprom.c b/arch/mips/bcm47xx/sprom.c index 2eff7fe99c6b..eff920560689 100644 --- a/arch/mips/bcm47xx/sprom.c +++ b/arch/mips/bcm47xx/sprom.c @@ -836,6 +836,38 @@ static int bcm47xx_get_sprom_ssb(struct ssb_bus *bus, struct ssb_sprom *out) #endif #if defined(CONFIG_BCM47XX_BCMA) +/* + * Having many NVRAM entries for PCI devices led to repeating prefixes like + * pci/1/1/ all the time and wasting flash space. So at some point Broadcom + * decided to introduce prefixes like 0: 1: 2: etc. + * If we find e.g. devpath0=pci/2/1 or devpath0=pci/2/1/ we should use 0: + * instead of pci/2/1/. + */ +static void bcm47xx_sprom_apply_prefix_alias(char *prefix, size_t prefix_size) +{ + size_t prefix_len = strlen(prefix); + size_t short_len = prefix_len - 1; + char nvram_var[10]; + char buf[20]; + int i; + + /* Passed prefix has to end with a slash */ + if (prefix_len <= 0 || prefix[prefix_len - 1] != '/') + return; + + for (i = 0; i < 3; i++) { + if (snprintf(nvram_var, sizeof(nvram_var), "devpath%d", i) <= 0) + continue; + if (bcm47xx_nvram_getenv(nvram_var, buf, sizeof(buf)) < 0) + continue; + if (!strcmp(buf, prefix) || + (short_len && strlen(buf) == short_len && !strncmp(buf, prefix, short_len))) { + snprintf(prefix, prefix_size, "%d:", i); + return; + } + } +} + static int bcm47xx_get_sprom_bcma(struct bcma_bus *bus, struct ssb_sprom *out) { char prefix[10]; @@ -847,6 +879,7 @@ static int bcm47xx_get_sprom_bcma(struct bcma_bus *bus, struct ssb_sprom *out) snprintf(prefix, sizeof(prefix), "pci/%u/%u/", bus->host_pci->bus->number + 1, PCI_SLOT(bus->host_pci->devfn)); + bcm47xx_sprom_apply_prefix_alias(prefix, sizeof(prefix)); bcm47xx_fill_sprom(out, prefix, false); return 0; case BCMA_HOSTTYPE_SOC: |