Root/target/linux/brcm47xx/patches-3.0/820-wgt634u-nvram-fix.patch

1The Netgear wgt634u uses a different format for storing the
2configuration. This patch is needed to read out the correct
3configuration. The cfe_env.c file uses a different method way to read
4out the configuration than the in kernel cfe config reader.
5
6--- a/arch/mips/bcm47xx/Makefile
7+++ b/arch/mips/bcm47xx/Makefile
8@@ -3,4 +3,4 @@
9 # under Linux.
10 #
11 
12-obj-y += gpio.o irq.o nvram.o prom.o serial.o setup.o time.o
13+obj-y += gpio.o irq.o nvram.o prom.o serial.o setup.o time.o cfe_env.o
14--- /dev/null
15+++ b/arch/mips/bcm47xx/cfe_env.c
16@@ -0,0 +1,229 @@
17+/*
18+ * CFE environment variable access
19+ *
20+ * Copyright 2001-2003, Broadcom Corporation
21+ * Copyright 2006, Felix Fietkau <nbd@openwrt.org>
22+ *
23+ * This program is free software; you can redistribute it and/or modify it
24+ * under the terms of the GNU General Public License as published by the
25+ * Free Software Foundation; either version 2 of the License, or (at your
26+ * option) any later version.
27+ */
28+
29+#include <linux/init.h>
30+#include <linux/module.h>
31+#include <linux/kernel.h>
32+#include <linux/string.h>
33+#include <asm/io.h>
34+#include <asm/uaccess.h>
35+
36+#define NVRAM_SIZE (0x1ff0)
37+static char _nvdata[NVRAM_SIZE];
38+static char _valuestr[256];
39+
40+/*
41+ * TLV types. These codes are used in the "type-length-value"
42+ * encoding of the items stored in the NVRAM device (flash or EEPROM)
43+ *
44+ * The layout of the flash/nvram is as follows:
45+ *
46+ * <type> <length> <data ...> <type> <length> <data ...> <type_end>
47+ *
48+ * The type code of "ENV_TLV_TYPE_END" marks the end of the list.
49+ * The "length" field marks the length of the data section, not
50+ * including the type and length fields.
51+ *
52+ * Environment variables are stored as follows:
53+ *
54+ * <type_env> <length> <flags> <name> = <value>
55+ *
56+ * If bit 0 (low bit) is set, the length is an 8-bit value.
57+ * If bit 0 (low bit) is clear, the length is a 16-bit value
58+ *
59+ * Bit 7 set indicates "user" TLVs. In this case, bit 0 still
60+ * indicates the size of the length field.
61+ *
62+ * Flags are from the constants below:
63+ *
64+ */
65+#define ENV_LENGTH_16BITS 0x00 /* for low bit */
66+#define ENV_LENGTH_8BITS 0x01
67+
68+#define ENV_TYPE_USER 0x80
69+
70+#define ENV_CODE_SYS(n,l) (((n)<<1)|(l))
71+#define ENV_CODE_USER(n,l) ((((n)<<1)|(l)) | ENV_TYPE_USER)
72+
73+/*
74+ * The actual TLV types we support
75+ */
76+
77+#define ENV_TLV_TYPE_END 0x00
78+#define ENV_TLV_TYPE_ENV ENV_CODE_SYS(0,ENV_LENGTH_8BITS)
79+
80+/*
81+ * Environment variable flags
82+ */
83+
84+#define ENV_FLG_NORMAL 0x00 /* normal read/write */
85+#define ENV_FLG_BUILTIN 0x01 /* builtin - not stored in flash */
86+#define ENV_FLG_READONLY 0x02 /* read-only - cannot be changed */
87+
88+#define ENV_FLG_MASK 0xFF /* mask of attributes we keep */
89+#define ENV_FLG_ADMIN 0x100 /* lets us internally override permissions */
90+
91+
92+/* *********************************************************************
93+ * _nvram_read(buffer,offset,length)
94+ *
95+ * Read data from the NVRAM device
96+ *
97+ * Input parameters:
98+ * buffer - destination buffer
99+ * offset - offset of data to read
100+ * length - number of bytes to read
101+ *
102+ * Return value:
103+ * number of bytes read, or <0 if error occured
104+ ********************************************************************* */
105+static int
106+_nvram_read(unsigned char *nv_buf, unsigned char *buffer, int offset, int length)
107+{
108+ int i;
109+ if (offset > NVRAM_SIZE)
110+ return -1;
111+
112+ for ( i = 0; i < length; i++) {
113+ buffer[i] = ((volatile unsigned char*)nv_buf)[offset + i];
114+ }
115+ return length;
116+}
117+
118+
119+static char*
120+_strnchr(const char *dest,int c,size_t cnt)
121+{
122+ while (*dest && (cnt > 0)) {
123+ if (*dest == c) return (char *) dest;
124+ dest++;
125+ cnt--;
126+ }
127+ return NULL;
128+}
129+
130+
131+
132+/*
133+ * Core support API: Externally visible.
134+ */
135+
136+/*
137+ * Get the value of an NVRAM variable
138+ * @param name name of variable to get
139+ * @return value of variable or NULL if undefined
140+ */
141+
142+char*
143+cfe_env_get(unsigned char *nv_buf, char* name)
144+{
145+ int size;
146+ unsigned char *buffer;
147+ unsigned char *ptr;
148+ unsigned char *envval;
149+ unsigned int reclen;
150+ unsigned int rectype;
151+ int offset;
152+ int flg;
153+
154+ if (!strcmp(name, "nvram_type"))
155+ return "cfe";
156+
157+ size = NVRAM_SIZE;
158+ buffer = &_nvdata[0];
159+
160+ ptr = buffer;
161+ offset = 0;
162+
163+ /* Read the record type and length */
164+ if (_nvram_read(nv_buf, ptr,offset,1) != 1) {
165+ goto error;
166+ }
167+
168+ while ((*ptr != ENV_TLV_TYPE_END) && (size > 1)) {
169+
170+ /* Adjust pointer for TLV type */
171+ rectype = *(ptr);
172+ offset++;
173+ size--;
174+
175+ /*
176+ * Read the length. It can be either 1 or 2 bytes
177+ * depending on the code
178+ */
179+ if (rectype & ENV_LENGTH_8BITS) {
180+ /* Read the record type and length - 8 bits */
181+ if (_nvram_read(nv_buf, ptr,offset,1) != 1) {
182+ goto error;
183+ }
184+ reclen = *(ptr);
185+ size--;
186+ offset++;
187+ }
188+ else {
189+ /* Read the record type and length - 16 bits, MSB first */
190+ if (_nvram_read(nv_buf, ptr,offset,2) != 2) {
191+ goto error;
192+ }
193+ reclen = (((unsigned int) *(ptr)) << 8) + (unsigned int) *(ptr+1);
194+ size -= 2;
195+ offset += 2;
196+ }
197+
198+ if (reclen > size)
199+ break; /* should not happen, bad NVRAM */
200+
201+ switch (rectype) {
202+ case ENV_TLV_TYPE_ENV:
203+ /* Read the TLV data */
204+ if (_nvram_read(nv_buf, ptr,offset,reclen) != reclen)
205+ goto error;
206+ flg = *ptr++;
207+ envval = (unsigned char *) _strnchr(ptr,'=',(reclen-1));
208+ if (envval) {
209+ *envval++ = '\0';
210+ memcpy(_valuestr,envval,(reclen-1)-(envval-ptr));
211+ _valuestr[(reclen-1)-(envval-ptr)] = '\0';
212+#if 0
213+ printk(KERN_INFO "NVRAM:%s=%s\n", ptr, _valuestr);
214+#endif
215+ if(!strcmp(ptr, name)){
216+ return _valuestr;
217+ }
218+ if((strlen(ptr) > 1) && !strcmp(&ptr[1], name))
219+ return _valuestr;
220+ }
221+ break;
222+
223+ default:
224+ /* Unknown TLV type, skip it. */
225+ break;
226+ }
227+
228+ /*
229+ * Advance to next TLV
230+ */
231+
232+ size -= (int)reclen;
233+ offset += reclen;
234+
235+ /* Read the next record type */
236+ ptr = buffer;
237+ if (_nvram_read(nv_buf, ptr,offset,1) != 1)
238+ goto error;
239+ }
240+
241+error:
242+ return NULL;
243+
244+}
245+
246--- a/arch/mips/bcm47xx/nvram.c
247+++ b/arch/mips/bcm47xx/nvram.c
248@@ -22,6 +22,8 @@
249 #include <asm/mach-bcm47xx/bcm47xx.h>
250 
251 static char nvram_buf[NVRAM_SPACE];
252+static int cfe_env;
253+extern char *cfe_env_get(char *nv_buf, const char *name);
254 
255 /* Probe for NVRAM header */
256 static void early_nvram_init(void)
257@@ -55,6 +57,25 @@ static void early_nvram_init(void)
258         break;
259 #endif
260     }
261+ cfe_env = 0;
262+
263+ /* XXX: hack for supporting the CFE environment stuff on WGT634U */
264+ if (lim >= 8 * 1024 * 1024) {
265+ src = (u32 *) KSEG1ADDR(base + 8 * 1024 * 1024 - 0x2000);
266+ dst = (u32 *) nvram_buf;
267+
268+ if ((*src & 0xff00ff) == 0x000001) {
269+ printk("early_nvram_init: WGT634U NVRAM found.\n");
270+
271+ for (i = 0; i < 0x1ff0; i++) {
272+ if (*src == 0xFFFFFFFF)
273+ break;
274+ *dst++ = *src++;
275+ }
276+ cfe_env = 1;
277+ return;
278+ }
279+ }
280 
281     off = FLASH_MIN;
282     while (off <= lim) {
283@@ -96,6 +117,12 @@ int nvram_getenv(char *name, char *val,
284     if (!nvram_buf[0])
285         early_nvram_init();
286 
287+ if (cfe_env) {
288+ value = cfe_env_get(nvram_buf, name);
289+ snprintf(val, val_len, "%s", value);
290+ return 0;
291+ }
292+
293     /* Look for name=value and return value */
294     var = &nvram_buf[sizeof(struct nvram_header)];
295     end = nvram_buf + sizeof(nvram_buf) - 2;
296@@ -125,6 +152,9 @@ char *nvram_get(const char *name)
297     if (!nvram_buf[0])
298         early_nvram_init();
299 
300+ if (cfe_env)
301+ return cfe_env_get(nvram_buf, name);
302+
303     /* Look for name=value and return value */
304     var = &nvram_buf[sizeof(struct nvram_header)];
305     end = nvram_buf + sizeof(nvram_buf) - 2;
306

Archive Download this file

Branches:
backfire
history
master
release_2010-11-17
release_2010-12-14
release_2011-02-23
release_2011-05-28
release_2011-08-27
release_2011-11-13
release_2012-03-18
release_2012-04-09
release_2012-10-11
uclibc_nptl



interactive