On x86 we use CMOS RAM to read and write some settings. Add basic support
for this, including access to registers 128-255.
Signed-off-by: Simon Glass <s...@chromium.org>
---
Changes in v2:
- Adjust the mc146818 driver instead of adding a new cmos.h header
drivers/rtc/mc146818.c | 53 +++++++++++++++++++++++++++++++++++++-------------
include/rtc.h | 32 ++++++++++++++++++++++++++++++
2 files changed, 71 insertions(+), 14 deletions(-)
diff --git a/drivers/rtc/mc146818.c b/drivers/rtc/mc146818.c
index 39e6041..b506b16 100644
--- a/drivers/rtc/mc146818.c
+++ b/drivers/rtc/mc146818.c
@@ -27,9 +27,6 @@
/* Set this to 1 to clear the CMOS RAM */
#define CLEAR_CMOS 0
-static uchar rtc_read (uchar reg);
-static void rtc_write (uchar reg, uchar val);
-
#define RTC_PORT_MC146818 CONFIG_SYS_ISA_IO_BASE_ADDRESS + 0x70
#define RTC_SECONDS 0x00
#define RTC_SECONDS_ALARM 0x01
@@ -133,32 +130,60 @@ void rtc_reset (void)
/* ------------------------------------------------------------------------- */
-#ifdef CONFIG_SYS_RTC_REG_BASE_ADDR
/*
* use direct memory access
*/
-static uchar rtc_read (uchar reg)
+int rtc_read(int reg)
{
+#ifdef CONFIG_SYS_RTC_REG_BASE_ADDR
return in8(CONFIG_SYS_RTC_REG_BASE_ADDR + reg);
+#else
+ int ofs = 0;
+
+ if (reg >= 128) {
+ ofs = 2;
+ reg -= 128;
+ }
+ out8(RTC_PORT_MC146818 + ofs, reg);
+
+ return in8(RTC_PORT_MC146818 + ofs + 1);
+#endif
}
-static void rtc_write (uchar reg, uchar val)
+void rtc_write(int reg, uchar val)
{
+#ifdef CONFIG_SYS_RTC_REG_BASE_ADDR
out8(CONFIG_SYS_RTC_REG_BASE_ADDR + reg, val);
-}
#else
-static uchar rtc_read (uchar reg)
+ int ofs = 0;
+
+ if (reg >= 128) {
+ ofs = 2;
+ reg -= 128;
+ }
+ out8(RTC_PORT_MC146818 + ofs, reg);
+ out8(RTC_PORT_MC146818 + ofs + 1, val);
+#endif
+}
+
+u32 rtc_read32(int reg)
{
- out8(RTC_PORT_MC146818,reg);
- return in8(RTC_PORT_MC146818 + 1);
+ u32 value = 0;
+ int i;
+
+ for (i = 0; i < sizeof(value); i++)
+ value |= rtc_read(reg + i) << (i << 3);
+
+ return value;
}
-static void rtc_write (uchar reg, uchar val)
+void rtc_write32(int reg, u32 value)
{
- out8(RTC_PORT_MC146818,reg);
- out8(RTC_PORT_MC146818+1, val);
+ int i;
+
+ for (i = 0; i < sizeof(value); i++)
+ rtc_write(reg + i, (value >> (i << 3)) & 0xff);
}
-#endif
void rtc_init(void)
{
diff --git a/include/rtc.h b/include/rtc.h
index d11aa8b..b6df1f4 100644
--- a/include/rtc.h
+++ b/include/rtc.h
@@ -51,6 +51,38 @@ unsigned long mktime (unsigned int, unsigned int, unsigned
int,
unsigned int, unsigned int, unsigned int);
/**
+ * rtc_read() - Read an 8-bit register
+ *
+ * @reg: Register to read
+ * @return value read
+ */
+int rtc_read(int reg);
+
+/**
+ * rtc_write() - Write an 8-bit register
+ *
+ * @reg: Register to write
+ * @value: Value to write
+ */
+void rtc_write(int reg, uchar val);
+
+/**
+ * rtc_read32() - Read a 32-bit value from the RTC
+ *
+ * @reg: Offset to start reading from
+ * @return value read
+ */
+u32 rtc_read32(int reg);
+
+/**
+ * rtc_write32() - Write a 32-bit value to the RTC
+ *
+ * @reg: Register to start writing to
+ * @value: Value to write
+ */
+void rtc_write32(int reg, u32 value);
+
+/**
* rtc_init() - Set up the real time clock ready for use
*/
void rtc_init(void);
--
2.2.0.rc0.207.ga3a616c
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