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From 9a6a2b96dfd8b01336f8519a5be7fb353cfa62fb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
Date: Sat, 14 Mar 2015 17:55:54 +0100
Subject: [PATCH] MIPS: BCM47XX: Support SPROM prefixes for PCI devices
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Support parsing SPROMs with prefixes defined like devpath1=pci/1/1
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: Hauke Mehrtens <hauke@hauke-m.de>
Patchwork: https://patchwork.linux-mips.org/patch/9552/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---
arch/mips/bcm47xx/sprom.c | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/arch/mips/bcm47xx/sprom.c b/arch/mips/bcm47xx/sprom.c
index 2eff7fe..eff9205 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:
--
1.8.4.5
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