MIPS: BCM47XX: Support SPROM prefixes for PCI devices

#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];

		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: