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path: root/src/drivers/pc80/rtc/mc146818rtc.c
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Diffstat (limited to 'src/drivers/pc80/rtc/mc146818rtc.c')
-rw-r--r--src/drivers/pc80/rtc/mc146818rtc.c228
1 files changed, 0 insertions, 228 deletions
diff --git a/src/drivers/pc80/rtc/mc146818rtc.c b/src/drivers/pc80/rtc/mc146818rtc.c
index ee61a6c22d..23f2db3556 100644
--- a/src/drivers/pc80/rtc/mc146818rtc.c
+++ b/src/drivers/pc80/rtc/mc146818rtc.c
@@ -26,18 +26,6 @@
#include <security/vboot/vbnv_layout.h>
#include <types.h>
-/* There's no way around this include guard. option_table.h is autogenerated */
-#if CONFIG(USE_OPTION_TABLE)
-#include "option_table.h"
-#else
-#define LB_CKS_RANGE_START 0
-#define LB_CKS_RANGE_END 0
-#define LB_CKS_LOC 0
-#endif
-
-/* Don't warn for checking >= LB_CKS_RANGE_START even though it may be 0. */
-#pragma GCC diagnostic ignored "-Wtype-limits"
-
static void cmos_reset_date(void)
{
/* Now setup a default date equals to the build date */
@@ -191,222 +179,6 @@ void cmos_init(bool invalid)
}
/*
- * This routine returns the value of the requested bits.
- * input bit = bit count from the beginning of the cmos image
- * length = number of bits to include in the value
- * ret = a character pointer to where the value is to be returned
- * returns CB_SUCCESS = successful, cb_err code if an error occurred
- */
-static enum cb_err get_cmos_value(unsigned long bit, unsigned long length,
- void *vret)
-{
- unsigned char *ret;
- unsigned long byte, byte_bit;
- unsigned long i;
- unsigned char uchar;
-
- /*
- * The table is checked when it is built to ensure all
- * values are valid.
- */
- 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 < 9) { /* one byte or less */
- uchar = cmos_read(byte); /* load the byte */
- uchar >>= byte_bit; /* shift the bits to byte align */
- /* clear unspecified bits */
- ret[0] = uchar & ((1 << length) - 1);
- } else { /* more than one byte so transfer the whole bytes */
- for (i = 0; length; i++, length -= 8, byte++) {
- /* load the byte */
- ret[i] = cmos_read(byte);
- }
- }
- return CB_SUCCESS;
-}
-
-static enum cb_err locate_cmos_layout(struct region_device *rdev)
-{
- uint32_t cbfs_type = CBFS_COMPONENT_CMOS_LAYOUT;
- MAYBE_STATIC_BSS struct cbfsf fh = {};
-
- /*
- * In case VBOOT is enabled and this function is called from SMM,
- * we have multiple CMOS layout files and to locate them we'd need to
- * include VBOOT into SMM...
- *
- * Support only one CMOS layout in the 'COREBOOT' region for now.
- */
- if (!region_device_sz(&(fh.data))) {
- if (cbfs_locate_file_in_region(&fh, "COREBOOT", "cmos_layout.bin",
- &cbfs_type)) {
- printk(BIOS_ERR, "RTC: cmos_layout.bin could not be found. "
- "Options are disabled\n");
- return CB_CMOS_LAYOUT_NOT_FOUND;
- }
- }
-
- cbfs_file_data(rdev, &fh);
-
- return CB_SUCCESS;
-}
-
-enum cb_err cmos_get_option(void *dest, const char *name)
-{
- struct cmos_option_table *ct;
- struct region_device rdev;
- struct cmos_entries *ce;
- size_t namelen;
- int found = 0;
-
- if (!CONFIG(USE_OPTION_TABLE))
- return CB_CMOS_OTABLE_DISABLED;
-
- /* Figure out how long name is */
- namelen = strnlen(name, CMOS_MAX_NAME_LENGTH);
-
- if (locate_cmos_layout(&rdev) != CB_SUCCESS) {
- return CB_CMOS_LAYOUT_NOT_FOUND;
- }
- ct = rdev_mmap_full(&rdev);
- if (!ct) {
- printk(BIOS_ERR, "RTC: cmos_layout.bin could not be mapped. "
- "Options are disabled\n");
-
- return CB_CMOS_LAYOUT_NOT_FOUND;
- }
-
- /* find the requested entry record */
- 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, "No CMOS option '%s'.\n", name);
- rdev_munmap(&rdev, ct);
- return CB_CMOS_OPTION_NOT_FOUND;
- }
-
- if (!cmos_checksum_valid(LB_CKS_RANGE_START, LB_CKS_RANGE_END, LB_CKS_LOC)) {
- rdev_munmap(&rdev, ct);
- return CB_CMOS_CHECKSUM_INVALID;
- }
- if (get_cmos_value(ce->bit, ce->length, dest) != CB_SUCCESS) {
- rdev_munmap(&rdev, ct);
- return CB_CMOS_ACCESS_ERROR;
- }
- rdev_munmap(&rdev, ct);
- return CB_SUCCESS;
-}
-
-static enum cb_err 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 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 CB_ERR_ARG;
-
- 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) {
- cmos_set_checksum(LB_CKS_RANGE_START, LB_CKS_RANGE_END,
- LB_CKS_LOC);
- }
- return CB_SUCCESS;
-}
-
-enum cb_err cmos_set_option(const char *name, void *value)
-{
- struct cmos_option_table *ct;
- struct region_device rdev;
- struct cmos_entries *ce;
- unsigned long length;
- size_t namelen;
- int found = 0;
-
- if (!CONFIG(USE_OPTION_TABLE))
- return CB_CMOS_OTABLE_DISABLED;
-
- /* Figure out how long name is */
- namelen = strnlen(name, CMOS_MAX_NAME_LENGTH);
-
- if (locate_cmos_layout(&rdev) != CB_SUCCESS) {
- return CB_CMOS_LAYOUT_NOT_FOUND;
- }
- ct = rdev_mmap_full(&rdev);
- if (!ct) {
- printk(BIOS_ERR, "RTC: cmos_layout.bin could not be mapped. "
- "Options are disabled\n");
-
- return CB_CMOS_LAYOUT_NOT_FOUND;
- }
-
- /* find the requested entry record */
- 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);
- rdev_munmap(&rdev, ct);
- return CB_CMOS_OPTION_NOT_FOUND;
- }
-
- 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})
- != CB_SUCCESS) {
- rdev_munmap(&rdev, ct);
- return CB_CMOS_ACCESS_ERROR;
- }
- }
-
- if (set_cmos_value(ce->bit, length, value) != CB_SUCCESS) {
- rdev_munmap(&rdev, ct);
- return CB_CMOS_ACCESS_ERROR;
- }
-
- rdev_munmap(&rdev, ct);
- return CB_SUCCESS;
-}
-
-/*
* Upon return the caller is guaranteed 244 microseconds to complete any
* RTC operations. wait_uip may be called a single time prior to multiple
* accesses, but sequences requiring more time should call wait_uip again.
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-26 20:46:03 +0000