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74 lines
2.5 KiB
Diff
74 lines
2.5 KiB
Diff
From 9a6a2b96dfd8b01336f8519a5be7fb353cfa62fb Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
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Date: Sat, 14 Mar 2015 17:55:54 +0100
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Subject: [PATCH] MIPS: BCM47XX: Support SPROM prefixes for PCI devices
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Support parsing SPROMs with prefixes defined like devpath1=pci/1/1
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Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
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Cc: linux-mips@linux-mips.org
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Cc: Hauke Mehrtens <hauke@hauke-m.de>
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Patchwork: https://patchwork.linux-mips.org/patch/9552/
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Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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---
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arch/mips/bcm47xx/sprom.c | 33 +++++++++++++++++++++++++++++++++
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1 file changed, 33 insertions(+)
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diff --git a/arch/mips/bcm47xx/sprom.c b/arch/mips/bcm47xx/sprom.c
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index 2eff7fe..eff9205 100644
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--- a/arch/mips/bcm47xx/sprom.c
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+++ b/arch/mips/bcm47xx/sprom.c
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@@ -836,6 +836,38 @@ static int bcm47xx_get_sprom_ssb(struct ssb_bus *bus, struct ssb_sprom *out)
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#endif
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#if defined(CONFIG_BCM47XX_BCMA)
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+/*
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+ * Having many NVRAM entries for PCI devices led to repeating prefixes like
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+ * pci/1/1/ all the time and wasting flash space. So at some point Broadcom
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+ * decided to introduce prefixes like 0: 1: 2: etc.
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+ * If we find e.g. devpath0=pci/2/1 or devpath0=pci/2/1/ we should use 0:
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+ * instead of pci/2/1/.
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+ */
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+static void bcm47xx_sprom_apply_prefix_alias(char *prefix, size_t prefix_size)
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+{
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+ size_t prefix_len = strlen(prefix);
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+ size_t short_len = prefix_len - 1;
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+ char nvram_var[10];
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+ char buf[20];
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+ int i;
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+
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+ /* Passed prefix has to end with a slash */
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+ if (prefix_len <= 0 || prefix[prefix_len - 1] != '/')
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+ return;
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+
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+ for (i = 0; i < 3; i++) {
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+ if (snprintf(nvram_var, sizeof(nvram_var), "devpath%d", i) <= 0)
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+ continue;
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+ if (bcm47xx_nvram_getenv(nvram_var, buf, sizeof(buf)) < 0)
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+ continue;
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+ if (!strcmp(buf, prefix) ||
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+ (short_len && strlen(buf) == short_len && !strncmp(buf, prefix, short_len))) {
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+ snprintf(prefix, prefix_size, "%d:", i);
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+ return;
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+ }
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+ }
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+}
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+
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static int bcm47xx_get_sprom_bcma(struct bcma_bus *bus, struct ssb_sprom *out)
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{
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char prefix[10];
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@@ -847,6 +879,7 @@ static int bcm47xx_get_sprom_bcma(struct bcma_bus *bus, struct ssb_sprom *out)
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snprintf(prefix, sizeof(prefix), "pci/%u/%u/",
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bus->host_pci->bus->number + 1,
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PCI_SLOT(bus->host_pci->devfn));
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+ bcm47xx_sprom_apply_prefix_alias(prefix, sizeof(prefix));
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bcm47xx_fill_sprom(out, prefix, false);
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return 0;
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case BCMA_HOSTTYPE_SOC:
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--
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1.8.4.5
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