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authorSven Schnelle <svens@stackframe.org>2011-06-06 15:58:54 +0200
committerPatrick Georgi <patrick@georgi-clan.de>2011-06-15 08:44:15 +0200
commitd29e5bb9335a7d185480a8a780b619d3a3151f11 (patch)
tree1fb5314199291d551c43f4b9448ef4fc28758c6b /src/pc80/mc146818rtc.c
parentd40d4f77126a6d7cbe932b4e6a43f86cde5a8689 (diff)
CMOS: add set_option()
Change-Id: I584189d9fcf7c9b831d9c020ee7ed59bb5ae08e8 Signed-off-by: Sven Schnelle <svens@stackframe.org> Reviewed-on: http://review.coreboot.org/23 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
Diffstat (limited to 'src/pc80/mc146818rtc.c')
-rw-r--r--src/pc80/mc146818rtc.c83
1 files changed, 83 insertions, 0 deletions
diff --git a/src/pc80/mc146818rtc.c b/src/pc80/mc146818rtc.c
index 5850ec6784..4bbfa9ea04 100644
--- a/src/pc80/mc146818rtc.c
+++ b/src/pc80/mc146818rtc.c
@@ -252,4 +252,87 @@ int get_option(void *dest, const char *name)
return(-4);
return(0);
}
+
+static int set_cmos_value(unsigned long bit, unsigned long length, void *vret)
+{
+ unsigned char *ret;
+ unsigned long byte,byte_bit;
+ unsigned long i;
+ unsigned char uchar, mask;
+ unsigned int chksum_update_needed = 0;
+
+ ret = vret;
+ byte = bit / 8; /* find the byte where the data starts */
+ byte_bit = bit % 8; /* find the bit in the byte where the data starts */
+ if(length <= 8) { /* one byte or less */
+ mask = (1 << length) - 1;
+ mask <<= byte_bit;
+
+ uchar = cmos_read(byte);
+ uchar &= ~mask;
+ uchar |= (ret[0] << byte_bit);
+ cmos_write(uchar, byte);
+ if (byte >= LB_CKS_RANGE_START && byte <= LB_CKS_RANGE_END)
+ chksum_update_needed = 1;
+ } else { /* more that one byte so transfer the whole bytes */
+ if (byte_bit || length % 8)
+ return -1;
+
+ for(i=0; length; i++, length-=8, byte++)
+ cmos_write(ret[i], byte);
+ if (byte >= LB_CKS_RANGE_START && byte <= LB_CKS_RANGE_END)
+ chksum_update_needed = 1;
+ }
+
+ if (chksum_update_needed) {
+ rtc_set_checksum(LB_CKS_RANGE_START,
+ LB_CKS_RANGE_END,LB_CKS_LOC);
+ }
+ return 0;
+}
+
+
+int set_option(const char *name, void *value)
+{
+ struct cmos_option_table *ct;
+ struct cmos_entries *ce;
+ unsigned long length;
+ size_t namelen;
+ int found=0;
+
+ /* Figure out how long name is */
+ namelen = strnlen(name, CMOS_MAX_NAME_LENGTH);
+
+ /* find the requested entry record */
+ ct=cbfs_find_file("cmos_layout.bin", CBFS_COMPONENT_CMOS_LAYOUT);
+ if (!ct) {
+ printk(BIOS_ERR, "cmos_layout.bin could not be found. Options are disabled\n");
+ return(-2);
+ }
+ ce=(struct cmos_entries*)((unsigned char *)ct + ct->header_length);
+ for(;ce->tag==LB_TAG_OPTION;
+ ce=(struct cmos_entries*)((unsigned char *)ce + ce->size)) {
+ if (memcmp(ce->name, name, namelen) == 0) {
+ found=1;
+ break;
+ }
+ }
+ if(!found) {
+ printk(BIOS_DEBUG, "WARNING: No CMOS option '%s'.\n", name);
+ return(-2);
+ }
+
+ length = ce->length;
+ if (ce->config == 's') {
+ length = MAX(strlen((const char *)value) * 8, ce->length - 8);
+ /* make sure the string is null terminated */
+ if ((set_cmos_value(ce->bit + ce->length - 8, 8, &(u8[]){0})))
+ return (-3);
+ }
+
+ if ((set_cmos_value(ce->bit, length, value)))
+ return (-3);
+
+ return 0;
+}
#endif /* CONFIG_USE_OPTION_TABLE */