diff options
Diffstat (limited to 'src/drivers/pc80/mc146818rtc.c')
| -rw-r--r-- | src/drivers/pc80/mc146818rtc.c | 142 |
1 files changed, 72 insertions, 70 deletions
diff --git a/src/drivers/pc80/mc146818rtc.c b/src/drivers/pc80/mc146818rtc.c index c54f6cefa5..9670e9ce6b 100644 --- a/src/drivers/pc80/mc146818rtc.c +++ b/src/drivers/pc80/mc146818rtc.c @@ -10,7 +10,8 @@ #endif #include <arch/acpi.h> -static void rtc_update_cmos_date(u8 has_century) + +static void cmos_update_date(u8 has_century) { /* Now setup a default date equals to the build date */ cmos_write(0, RTC_CLK_SECOND); @@ -24,28 +25,27 @@ static void rtc_update_cmos_date(u8 has_century) } #if CONFIG_USE_OPTION_TABLE -static int rtc_checksum_valid(int range_start, int range_end, int cks_loc) +static int cmos_checksum_valid(int range_start, int range_end, int cks_loc) { int i; u16 sum, old_sum; sum = 0; - for(i = range_start; i <= range_end; i++) { + for (i = range_start; i <= range_end; i++) sum += cmos_read(i); - } - old_sum = ((cmos_read(cks_loc)<<8) | cmos_read(cks_loc+1))&0x0ffff; + old_sum = ((cmos_read(cks_loc) << 8) | cmos_read(cks_loc + 1)) & + 0x0ffff; return sum == old_sum; } -static void rtc_set_checksum(int range_start, int range_end, int cks_loc) +static void cmos_set_checksum(int range_start, int range_end, int cks_loc) { int i; u16 sum; sum = 0; - for(i = range_start; i <= range_end; i++) { + for (i = range_start; i <= range_end; i++) sum += cmos_read(i); - } cmos_write(((sum >> 8) & 0x0ff), cks_loc); - cmos_write(((sum >> 0) & 0x0ff), cks_loc+1); + cmos_write(((sum >> 0) & 0x0ff), cks_loc + 1); } #endif @@ -60,7 +60,7 @@ static void rtc_set_checksum(int range_start, int range_end, int cks_loc) #endif #ifndef __SMM__ -void rtc_init(int invalid) +void cmos_init(int invalid) { int cmos_invalid = 0; int checksum_invalid = 0; @@ -87,7 +87,7 @@ void rtc_init(int invalid) cmos_invalid = !(x & RTC_VRT); /* See if there is a CMOS checksum error */ - checksum_invalid = !rtc_checksum_valid(PC_CKS_RANGE_START, + checksum_invalid = !cmos_checksum_valid(PC_CKS_RANGE_START, PC_CKS_RANGE_END,PC_CKS_LOC); #define CLEAR_CMOS 0 @@ -102,13 +102,11 @@ void rtc_init(int invalid) cmos_write(0, 0x01); cmos_write(0, 0x03); cmos_write(0, 0x05); - for(i = 10; i < 128; i++) { + for (i = 10; i < 128; i++) cmos_write(0, i); - } #endif - if (cmos_invalid) { - rtc_update_cmos_date(RTC_HAS_NO_ALTCENTURY); - } + if (cmos_invalid) + cmos_update_date(RTC_HAS_NO_ALTCENTURY); printk(BIOS_WARNING, "RTC:%s%s%s%s\n", invalid?" Clear requested":"", @@ -126,30 +124,29 @@ void rtc_init(int invalid) #if CONFIG_USE_OPTION_TABLE /* See if there is a LB CMOS checksum error */ - checksum_invalid = !rtc_checksum_valid(LB_CKS_RANGE_START, + checksum_invalid = !cmos_checksum_valid(LB_CKS_RANGE_START, LB_CKS_RANGE_END,LB_CKS_LOC); - if(checksum_invalid) + if (checksum_invalid) printk(BIOS_DEBUG, "RTC: coreboot checksum invalid\n"); /* Make certain we have a valid checksum */ - rtc_set_checksum(PC_CKS_RANGE_START, - PC_CKS_RANGE_END,PC_CKS_LOC); + cmos_set_checksum(PC_CKS_RANGE_START, PC_CKS_RANGE_END, PC_CKS_LOC); #endif /* Clear any pending interrupts */ - (void) cmos_read(RTC_INTR_FLAGS); + cmos_read(RTC_INTR_FLAGS); } #endif #if CONFIG_USE_OPTION_TABLE -/* 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 - output the value placed in ret - returns CB_SUCCESS = successful, cb_err code if an error occurred -*/ +/* + * 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) { @@ -158,21 +155,22 @@ static enum cb_err get_cmos_value(unsigned long bit, unsigned long length, unsigned long i; unsigned char uchar; - /* The table is checked when it is built to ensure all - values are valid. */ + /* + * 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 */ + 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 that one byte so transfer the whole bytes */ - for(i=0;length;i++,length-=8,byte++) { + ret[0] = uchar & ((1 << length) - 1); + } else { /* more that one byte so transfer the whole bytes */ + for (i = 0; length; i++, length -= 8, byte++) { /* load the byte */ - ret[i]=cmos_read(byte); + ret[i] = cmos_read(byte); } } return CB_SUCCESS; @@ -183,7 +181,7 @@ enum cb_err get_option(void *dest, const char *name) struct cmos_option_table *ct; struct cmos_entries *ce; size_t namelen; - int found=0; + int found = 0; /* Figure out how long name is */ namelen = strnlen(name, CMOS_MAX_NAME_LENGTH); @@ -196,22 +194,22 @@ enum cb_err get_option(void *dest, const char *name) "Options are disabled\n"); return CB_CMOS_LAYOUT_NOT_FOUND; } - 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)) { + 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; + found = 1; break; } } - if(!found) { + if (!found) { printk(BIOS_DEBUG, "WARNING: No CMOS option '%s'.\n", name); return CB_CMOS_OPTION_NOT_FOUND; } - if(get_cmos_value(ce->bit, ce->length, dest) != CB_SUCCESS) + if (get_cmos_value(ce->bit, ce->length, dest) != CB_SUCCESS) return CB_CMOS_ACCESS_ERROR; - if(!rtc_checksum_valid(LB_CKS_RANGE_START, LB_CKS_RANGE_END,LB_CKS_LOC)) + if (!cmos_checksum_valid(LB_CKS_RANGE_START, LB_CKS_RANGE_END, LB_CKS_LOC)) return CB_CMOS_CHECKSUM_INVALID; return CB_SUCCESS; } @@ -226,9 +224,9 @@ static enum cb_err set_cmos_value(unsigned long bit, unsigned long length, 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 */ + 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; @@ -238,19 +236,20 @@ static enum cb_err set_cmos_value(unsigned long bit, unsigned long length, 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 */ + } 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++) + for (i = 0; length; i++, length -= 8, byte++) cmos_write(ret[i], byte); - if (byte >= LB_CKS_RANGE_START && byte <= LB_CKS_RANGE_END) + 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); + cmos_set_checksum(LB_CKS_RANGE_START, LB_CKS_RANGE_END, + LB_CKS_LOC); } return CB_SUCCESS; } @@ -262,7 +261,7 @@ enum cb_err set_option(const char *name, void *value) struct cmos_entries *ce; unsigned long length; size_t namelen; - int found=0; + int found = 0; /* Figure out how long name is */ namelen = strnlen(name, CMOS_MAX_NAME_LENGTH); @@ -271,18 +270,19 @@ enum cb_err set_option(const char *name, void *value) ct = cbfs_get_file_content(CBFS_DEFAULT_MEDIA, "cmos_layout.bin", CBFS_COMPONENT_CMOS_LAYOUT, NULL); if (!ct) { - printk(BIOS_ERR, "cmos_layout.bin could not be found. Options are disabled\n"); + printk(BIOS_ERR, "cmos_layout.bin could not be found. " + "Options are disabled\n"); return CB_CMOS_LAYOUT_NOT_FOUND; } - 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)) { + 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; + found = 1; break; } } - if(!found) { + if (!found) { printk(BIOS_DEBUG, "WARNING: No CMOS option '%s'.\n", name); return CB_CMOS_OPTION_NOT_FOUND; } @@ -308,17 +308,19 @@ enum cb_err set_option(const char *name, void *value) * hurts some OSes. Even if we don't set USE_OPTION_TABLE, we need * to make sure the date is valid. */ -void rtc_check_update_cmos_date(u8 has_century) +void cmos_check_update_date(u8 has_century) { u8 year, century; - /* Note: We need to check if the hardware supports RTC_CLK_ALTCENTURY. */ - century = has_century ? cmos_read(RTC_CLK_ALTCENTURY) : 0; - year = cmos_read(RTC_CLK_YEAR); + /* Note: Need to check if the hardware supports RTC_CLK_ALTCENTURY. */ + century = has_century ? cmos_read(RTC_CLK_ALTCENTURY) : 0; + year = cmos_read(RTC_CLK_YEAR); - /* TODO: If century is 0xFF, 100% that the cmos is cleared. - * Other than that, so far rtc_year is the only entry to check if the date is valid. */ - if (century > 0x99 || year > 0x99) { /* Invalid date */ - rtc_update_cmos_date(has_century); - } + /* + * TODO: If century is 0xFF, 100% that the cmos is cleared. + * Other than that, so far rtc_year is the only entry to check + * if the date is valid. + */ + if (century > 0x99 || year > 0x99) /* Invalid date */ + cmos_update_date(has_century); } |