1 files changed, 340 insertions, 0 deletions
diff --git a/src/drivers/pc80/mc146818rtc.c b/src/drivers/pc80/mc146818rtc.c
new file mode 100644
index 0000000000..99d670de42
--- /dev/null
+++ b/src/drivers/pc80/mc146818rtc.c
@@ -0,0 +1,340 @@
+#include <stdint.h>
+#include <console/console.h>
+#include <pc80/mc146818rtc.h>
+#include <boot/coreboot_tables.h>
+#include <string.h>
+#if CONFIG_USE_OPTION_TABLE
+#include "option_table.h"
+#include <cbfs.h>
+#endif
+
+/* control registers - Moto names
+ */
+#define RTC_REG_A		10
+#define RTC_REG_B		11
+#define RTC_REG_C		12
+#define RTC_REG_D		13
+
+
+/**********************************************************************
+ * register details
+ **********************************************************************/
+#define RTC_FREQ_SELECT	RTC_REG_A
+
+/* update-in-progress  - set to "1" 244 microsecs before RTC goes off the bus,
+ * reset after update (may take 1.984ms @ 32768Hz RefClock) is complete,
+ * totalling to a max high interval of 2.228 ms.
+ */
+# define RTC_UIP		0x80
+# define RTC_DIV_CTL		0x70
+   /* divider control: refclock values 4.194 / 1.049 MHz / 32.768 kHz */
+#  define RTC_REF_CLCK_4MHZ	0x00
+#  define RTC_REF_CLCK_1MHZ	0x10
+#  define RTC_REF_CLCK_32KHZ	0x20
+   /* 2 values for divider stage reset, others for "testing purposes only" */
+#  define RTC_DIV_RESET1	0x60
+#  define RTC_DIV_RESET2	0x70
+  /* Periodic intr. / Square wave rate select. 0=none, 1=32.8kHz,... 15=2Hz */
+# define RTC_RATE_SELECT 	0x0F
+#  define RTC_RATE_NONE		0x00
+#  define RTC_RATE_32786HZ	0x01
+#  define RTC_RATE_16384HZ	0x02
+#  define RTC_RATE_8192HZ	0x03
+#  define RTC_RATE_4096HZ	0x04
+#  define RTC_RATE_2048HZ	0x05
+#  define RTC_RATE_1024HZ	0x06
+#  define RTC_RATE_512HZ	0x07
+#  define RTC_RATE_256HZ	0x08
+#  define RTC_RATE_128HZ	0x09
+#  define RTC_RATE_64HZ		0x0a
+#  define RTC_RATE_32HZ		0x0b
+#  define RTC_RATE_16HZ		0x0c
+#  define RTC_RATE_8HZ		0x0d
+#  define RTC_RATE_4HZ		0x0e
+#  define RTC_RATE_2HZ		0x0f
+
+/**********************************************************************/
+#define RTC_CONTROL	RTC_REG_B
+# define RTC_SET 0x80		/* disable updates for clock setting */
+# define RTC_PIE 0x40		/* periodic interrupt enable */
+# define RTC_AIE 0x20		/* alarm interrupt enable */
+# define RTC_UIE 0x10		/* update-finished interrupt enable */
+# define RTC_SQWE 0x08		/* enable square-wave output */
+# define RTC_DM_BINARY 0x04	/* all time/date values are BCD if clear */
+# define RTC_24H 0x02		/* 24 hour mode - else hours bit 7 means pm */
+# define RTC_DST_EN 0x01	/* auto switch DST - works f. USA only */
+
+/**********************************************************************/
+#define RTC_INTR_FLAGS	RTC_REG_C
+/* caution - cleared by read */
+# define RTC_IRQF 0x80		/* any of the following 3 is active */
+# define RTC_PF 0x40
+# define RTC_AF 0x20
+# define RTC_UF 0x10
+
+/**********************************************************************/
+#define RTC_VALID	RTC_REG_D
+# define RTC_VRT 0x80		/* valid RAM and time */
+/**********************************************************************/
+
+#if CONFIG_USE_OPTION_TABLE
+static int rtc_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++) {
+		sum += cmos_read(i);
+	}
+	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)
+{
+	int i;
+	u16 sum;
+	sum = 0;
+	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);
+}
+#endif
+
+#if CONFIG_ARCH_X86
+#define RTC_CONTROL_DEFAULT (RTC_24H)
+#define RTC_FREQ_SELECT_DEFAULT (RTC_REF_CLCK_32KHZ | RTC_RATE_1024HZ)
+#else
+#if CONFIG_ARCH_ALPHA
+#define RTC_CONTROL_DEFAULT (RTC_SQWE | RTC_24H)
+#define RTC_FREQ_SELECT_DEFAULT (RTC_REF_CLCK_32KHZ | RTC_RATE_1024HZ)
+#endif
+#endif
+
+void rtc_init(int invalid)
+{
+#if CONFIG_USE_OPTION_TABLE
+	unsigned char x;
+	int cmos_invalid, checksum_invalid;
+#endif
+
+	printk(BIOS_DEBUG, "RTC Init\n");
+
+#if CONFIG_USE_OPTION_TABLE
+	/* See if there has been a CMOS power problem. */
+	x = cmos_read(RTC_VALID);
+	cmos_invalid = !(x & RTC_VRT);
+
+	/* See if there is a CMOS checksum error */
+	checksum_invalid = !rtc_checksum_valid(PC_CKS_RANGE_START,
+			PC_CKS_RANGE_END,PC_CKS_LOC);
+
+#define CLEAR_CMOS 0
+	if (invalid || cmos_invalid || checksum_invalid) {
+		printk(BIOS_WARNING, "RTC:%s%s%s%s\n",
+			invalid?" Clear requested":"",
+			cmos_invalid?" Power Problem":"",
+			checksum_invalid?" Checksum invalid":"",
+			CLEAR_CMOS?" zeroing cmos":"");
+#if CLEAR_CMOS
+		cmos_write(0, 0x01);
+		cmos_write(0, 0x03);
+		cmos_write(0, 0x05);
+		for(i = 10; i < 48; i++) {
+			cmos_write(0, i);
+		}
+
+		if (cmos_invalid) {
+			/* Now setup a default date of Sat 1 January 2000 */
+			cmos_write(0, 0x00); /* seconds */
+			cmos_write(0, 0x02); /* minutes */
+			cmos_write(1, 0x04); /* hours */
+			cmos_write(7, 0x06); /* day of week */
+			cmos_write(1, 0x07); /* day of month */
+			cmos_write(1, 0x08); /* month */
+			cmos_write(0, 0x09); /* year */
+		}
+#endif
+	}
+#endif
+
+	/* Setup the real time clock */
+	cmos_write(RTC_CONTROL_DEFAULT, RTC_CONTROL);
+	/* Setup the frequency it operates at */
+	cmos_write(RTC_FREQ_SELECT_DEFAULT, RTC_FREQ_SELECT);
+
+#if CONFIG_USE_OPTION_TABLE
+	/* See if there is a LB CMOS checksum error */
+	checksum_invalid = !rtc_checksum_valid(LB_CKS_RANGE_START,
+			LB_CKS_RANGE_END,LB_CKS_LOC);
+	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);
+#endif
+
+	/* Clear any pending interrupts */
+	(void) cmos_read(RTC_INTR_FLAGS);
+}
+
+
+#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 0 = successful, -1 = an error occurred
+*/
+static int 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 that one byte so transfer the whole bytes */
+		for(i=0;length;i++,length-=8,byte++) {
+			/* load the byte */
+			ret[i]=cmos_read(byte);
+		}
+	}
+	return 0;
+}
+
+int get_option(void *dest, const char *name)
+{
+	struct cmos_option_table *ct;
+	struct cmos_entries *ce;
+	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, "RTC: 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);
+	}
+
+	if(get_cmos_value(ce->bit, ce->length, dest))
+		return(-3);
+	if(!rtc_checksum_valid(LB_CKS_RANGE_START,
+			LB_CKS_RANGE_END,LB_CKS_LOC))
+		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 */