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brcm47xx: support SPROM/NVRAM prefixes

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Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 44855
This commit is contained in:
Rafał Miłecki 2015-03-17 07:07:17 +00:00
parent 917fb76321
commit 76811de003
1 changed files with 74 additions and 0 deletions
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74
target/linux/brcm47xx/patches-3.18/100-MIPS-BCM47XX-Support-SPROM-prefixes-for-PCI-devices.patch Normal file
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@ -0,0 +1,74 @@
From f3505e9283290dd9bb6197bd485e6cbfb5beaf7e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
Date: Wed, 11 Mar 2015 19:24:42 +0100
Subject: [PATCH V2] 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>
---
V2: I've noticed that Buffalo WZR-1750 uses an extra slash in NVRAM
devpaths entries. I added support for them and updated comment.
This adds one line over 80 chars, but it improved condition
readability so I think it's alright there.
---
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 290309e..5d32afc 100644
--- a/arch/mips/bcm47xx/sprom.c
+++ b/arch/mips/bcm47xx/sprom.c
@@ -822,6 +822,38 @@ 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];
@@ -833,6 +865,7 @@ 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