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255 lines
8.2 KiB
Diff
255 lines
8.2 KiB
Diff
commit 121915c4ee0812a14bc8d752bc210d0238d755c1
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Author: Waldemar Brodkorb <mips@waldemar-brodkorb.de>
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Date: Tue Jun 8 19:06:01 2010 +0200
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MIPS: BCM47xx: Add NVRAM support devices
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When trying to netboot a Linksys WRT54GS WLAN router, the bootup fails,
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because of following error message:
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...
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[ 0.424000] b44: b44.c:v2.0
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[ 0.424000] b44: Invalid MAC address found in EEPROM
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[ 0.432000] b44 ssb0:1: Problem fetching invariants of chip,aborting
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[ 0.436000] b44: probe of ssb0:1 failed with error -22
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...
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The router uses a CFE bootloader, but most of the needed environment
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variables for network card initialization, are not available from CFE
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via printenv and even though not via cfe_getenv().
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The required environment variables are saved in a special partition
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in flash memory. The attached patch implement nvram_getenv and enables
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bootup via NFS root on my router.
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Most of the patch is extracted from the OpenWrt subversion repository and
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stripped down and cleaned up to just fix this issue.
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[Ralf: sorted out header file inclusions. Lots of unneded headers and such
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that should have been included.]
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Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
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Reviewed-by: Phil Sutter <phil@nwl.cc>
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To: linux-mips@linux-mips.org
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Cc: Hauke Mehrtens <hauke@hauke-m.de>
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Patchwork: http://patchwork.linux-mips.org/patch/1359/
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Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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--- a/arch/mips/bcm47xx/Makefile
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+++ b/arch/mips/bcm47xx/Makefile
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@@ -3,4 +3,4 @@
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# under Linux.
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#
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-obj-y := gpio.o irq.o prom.o serial.o setup.o time.o wgt634u.o
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+obj-y := gpio.o irq.o nvram.o prom.o serial.o setup.o time.o wgt634u.o
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--- /dev/null
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+++ b/arch/mips/bcm47xx/nvram.c
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@@ -0,0 +1,94 @@
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+/*
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+ * BCM947xx nvram variable access
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+ *
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+ * Copyright (C) 2005 Broadcom Corporation
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+ * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License as published by the
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+ * Free Software Foundation; either version 2 of the License, or (at your
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+ * option) any later version.
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+ */
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+
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+#include <linux/init.h>
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+#include <linux/types.h>
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+#include <linux/module.h>
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+#include <linux/ssb/ssb.h>
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+#include <linux/kernel.h>
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+#include <linux/string.h>
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+#include <asm/addrspace.h>
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+#include <asm/mach-bcm47xx/nvram.h>
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+#include <asm/mach-bcm47xx/bcm47xx.h>
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+
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+static char nvram_buf[NVRAM_SPACE];
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+
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+/* Probe for NVRAM header */
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+static void __init early_nvram_init(void)
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+{
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+ struct ssb_mipscore *mcore = &ssb_bcm47xx.mipscore;
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+ struct nvram_header *header;
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+ int i;
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+ u32 base, lim, off;
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+ u32 *src, *dst;
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+
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+ base = mcore->flash_window;
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+ lim = mcore->flash_window_size;
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+
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+ off = FLASH_MIN;
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+ while (off <= lim) {
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+ /* Windowed flash access */
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+ header = (struct nvram_header *)
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+ KSEG1ADDR(base + off - NVRAM_SPACE);
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+ if (header->magic == NVRAM_HEADER)
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+ goto found;
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+ off <<= 1;
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+ }
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+
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+ /* Try embedded NVRAM at 4 KB and 1 KB as last resorts */
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+ header = (struct nvram_header *) KSEG1ADDR(base + 4096);
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+ if (header->magic == NVRAM_HEADER)
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+ goto found;
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+
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+ header = (struct nvram_header *) KSEG1ADDR(base + 1024);
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+ if (header->magic == NVRAM_HEADER)
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+ goto found;
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+
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+ return;
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+
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+found:
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+ src = (u32 *) header;
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+ dst = (u32 *) nvram_buf;
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+ for (i = 0; i < sizeof(struct nvram_header); i += 4)
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+ *dst++ = *src++;
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+ for (; i < header->len && i < NVRAM_SPACE; i += 4)
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+ *dst++ = le32_to_cpu(*src++);
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+}
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+
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+int nvram_getenv(char *name, char *val, size_t val_len)
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+{
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+ char *var, *value, *end, *eq;
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+
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+ if (!name)
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+ return 1;
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+
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+ if (!nvram_buf[0])
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+ early_nvram_init();
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+
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+ /* Look for name=value and return value */
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+ var = &nvram_buf[sizeof(struct nvram_header)];
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+ end = nvram_buf + sizeof(nvram_buf) - 2;
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+ end[0] = end[1] = '\0';
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+ for (; *var; var = value + strlen(value) + 1) {
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+ eq = strchr(var, '=');
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+ if (!eq)
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+ break;
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+ value = eq + 1;
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+ if ((eq - var) == strlen(name) &&
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+ strncmp(var, name, (eq - var)) == 0) {
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+ snprintf(val, val_len, "%s", value);
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+ return 0;
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+ }
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+ }
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+ return 1;
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+}
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+EXPORT_SYMBOL(nvram_getenv);
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--- a/arch/mips/bcm47xx/setup.c
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+++ b/arch/mips/bcm47xx/setup.c
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@@ -1,8 +1,8 @@
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/*
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* Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org>
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- * Copyright (C) 2005 Waldemar Brodkorb <wbx@openwrt.org>
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* Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
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* Copyright (C) 2006 Michael Buesch <mb@bu3sch.de>
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+ * Copyright (C) 2010 Waldemar Brodkorb <wbx@openadk.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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@@ -33,6 +33,7 @@
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#include <asm/time.h>
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#include <bcm47xx.h>
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#include <asm/fw/cfe/cfe_api.h>
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+#include <asm/mach-bcm47xx/nvram.h>
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struct ssb_bus ssb_bcm47xx;
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EXPORT_SYMBOL(ssb_bcm47xx);
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@@ -81,28 +82,42 @@ static int bcm47xx_get_invariants(struct
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/* Fill boardinfo structure */
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memset(&(iv->boardinfo), 0 , sizeof(struct ssb_boardinfo));
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- if (cfe_getenv("boardvendor", buf, sizeof(buf)) >= 0)
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+ if (cfe_getenv("boardvendor", buf, sizeof(buf)) >= 0 ||
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+ nvram_getenv("boardvendor", buf, sizeof(buf)) >= 0)
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iv->boardinfo.type = (u16)simple_strtoul(buf, NULL, 0);
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- if (cfe_getenv("boardtype", buf, sizeof(buf)) >= 0)
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+ if (cfe_getenv("boardtype", buf, sizeof(buf)) >= 0 ||
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+ nvram_getenv("boardtype", buf, sizeof(buf)) >= 0)
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iv->boardinfo.type = (u16)simple_strtoul(buf, NULL, 0);
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- if (cfe_getenv("boardrev", buf, sizeof(buf)) >= 0)
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+ if (cfe_getenv("boardrev", buf, sizeof(buf)) >= 0 ||
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+ nvram_getenv("boardrev", buf, sizeof(buf)) >= 0)
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iv->boardinfo.rev = (u16)simple_strtoul(buf, NULL, 0);
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/* Fill sprom structure */
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memset(&(iv->sprom), 0, sizeof(struct ssb_sprom));
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iv->sprom.revision = 3;
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- if (cfe_getenv("et0macaddr", buf, sizeof(buf)) >= 0)
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+ if (cfe_getenv("et0macaddr", buf, sizeof(buf)) >= 0 ||
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+ nvram_getenv("et0macaddr", buf, sizeof(buf)) >= 0)
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str2eaddr(buf, iv->sprom.et0mac);
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- if (cfe_getenv("et1macaddr", buf, sizeof(buf)) >= 0)
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+
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+ if (cfe_getenv("et1macaddr", buf, sizeof(buf)) >= 0 ||
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+ nvram_getenv("et1macaddr", buf, sizeof(buf)) >= 0)
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str2eaddr(buf, iv->sprom.et1mac);
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- if (cfe_getenv("et0phyaddr", buf, sizeof(buf)) >= 0)
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- iv->sprom.et0phyaddr = simple_strtoul(buf, NULL, 10);
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- if (cfe_getenv("et1phyaddr", buf, sizeof(buf)) >= 0)
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- iv->sprom.et1phyaddr = simple_strtoul(buf, NULL, 10);
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- if (cfe_getenv("et0mdcport", buf, sizeof(buf)) >= 0)
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+
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+ if (cfe_getenv("et0phyaddr", buf, sizeof(buf)) >= 0 ||
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+ nvram_getenv("et0phyaddr", buf, sizeof(buf)) >= 0)
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+ iv->sprom.et0phyaddr = simple_strtoul(buf, NULL, 0);
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+
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+ if (cfe_getenv("et1phyaddr", buf, sizeof(buf)) >= 0 ||
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+ nvram_getenv("et1phyaddr", buf, sizeof(buf)) >= 0)
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+ iv->sprom.et1phyaddr = simple_strtoul(buf, NULL, 0);
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+
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+ if (cfe_getenv("et0mdcport", buf, sizeof(buf)) >= 0 ||
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+ nvram_getenv("et0mdcport", buf, sizeof(buf)) >= 0)
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iv->sprom.et0mdcport = simple_strtoul(buf, NULL, 10);
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- if (cfe_getenv("et1mdcport", buf, sizeof(buf)) >= 0)
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+
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+ if (cfe_getenv("et1mdcport", buf, sizeof(buf)) >= 0 ||
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+ nvram_getenv("et1mdcport", buf, sizeof(buf)) >= 0)
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iv->sprom.et1mdcport = simple_strtoul(buf, NULL, 10);
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return 0;
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--- /dev/null
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+++ b/arch/mips/include/asm/mach-bcm47xx/nvram.h
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@@ -0,0 +1,36 @@
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+/*
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+ * Copyright (C) 2005, Broadcom Corporation
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+ * Copyright (C) 2006, Felix Fietkau <nbd@openwrt.org>
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License as published by the
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+ * Free Software Foundation; either version 2 of the License, or (at your
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+ * option) any later version.
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+ */
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+
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+#ifndef __NVRAM_H
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+#define __NVRAM_H
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+
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+#include <linux/types.h>
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+
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+struct nvram_header {
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+ u32 magic;
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+ u32 len;
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+ u32 crc_ver_init; /* 0:7 crc, 8:15 ver, 16:31 sdram_init */
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+ u32 config_refresh; /* 0:15 sdram_config, 16:31 sdram_refresh */
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+ u32 config_ncdl; /* ncdl values for memc */
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+};
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+
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+#define NVRAM_HEADER 0x48534C46 /* 'FLSH' */
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+#define NVRAM_VERSION 1
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+#define NVRAM_HEADER_SIZE 20
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+#define NVRAM_SPACE 0x8000
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+
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+#define FLASH_MIN 0x00020000 /* Minimum flash size */
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+
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+#define NVRAM_MAX_VALUE_LEN 255
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+#define NVRAM_MAX_PARAM_LEN 64
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+
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+extern int nvram_getenv(char *name, char *val, size_t val_len);
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+
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+#endif
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