aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorwdenk <wdenk>2004-10-10 18:03:33 +0000
committerwdenk <wdenk>2004-10-10 18:03:33 +0000
commitb65085130aed33584d95502c20317ad4379c1ca6 (patch)
treeeed2284bd6c1d9336df1ba926a1c6f2be8b876ff
parent2cbe571a5676a41aa32ff98e9b1a2934e3922574 (diff)
downloadu-boot-linaro-stable-b65085130aed33584d95502c20317ad4379c1ca6.tar.gz
Code Cleanup
Patch by Gary Jennejohn, 04 Oct 2004: - fix I2C on at91rm9200 - add support for Ricoh RS5C372A RTC
-rw-r--r--CHANGELOG4
-rw-r--r--board/cmc_pu2/memsetup.S40
-rw-r--r--cpu/at91rm9200/i2c.c12
-rw-r--r--include/at91rm9200_i2c.h158
-rw-r--r--rtc/Makefile2
-rw-r--r--rtc/rs5c372.c303
6 files changed, 415 insertions, 104 deletions
diff --git a/CHANGELOG b/CHANGELOG
index acc800e42..db8cc8b61 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -2,6 +2,10 @@
Changes since U-Boot 1.1.1:
======================================================================
+* Patch by Gary Jennejohn, 04 Oct 2004:
+ - fix I2C on at91rm9200
+ - add support for Ricoh RS5C372A RTC
+
* Patch by Gary Jennejohn, 01 Oct 2004:
- add support for CMC PU2 board
- add support for I2C on at91rm9200
diff --git a/board/cmc_pu2/memsetup.S b/board/cmc_pu2/memsetup.S
index 168cd6bd8..2d0e1d701 100644
--- a/board/cmc_pu2/memsetup.S
+++ b/board/cmc_pu2/memsetup.S
@@ -2,7 +2,7 @@
* Memory Setup stuff - taken from blob memsetup.S
*
* Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl) and
- * Jan-Derk Bakker (J.D.Bakker@its.tudelft.nl)
+ * Jan-Derk Bakker (J.D.Bakker@its.tudelft.nl)
*
* Modified for the at91rm9200dk board by
* (C) Copyright 2004
@@ -18,7 +18,7 @@
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
@@ -92,36 +92,36 @@ _TEXT_BASE:
.globl memsetup
memsetup:
/* memory control configuration */
- /* this isn't very elegant, but what the heck */
- ldr r0, =SMRDATA
+ /* this isn't very elegant, but what the heck */
+ ldr r0, =SMRDATA
ldr r1, _TEXT_BASE
sub r0, r0, r1
- add r2, r0, #80
+ add r2, r0, #80
0:
/* the address */
- ldr r1, [r0], #4
+ ldr r1, [r0], #4
/* the value */
- ldr r3, [r0], #4
- str r3, [r1]
- cmp r2, r0
- bne 0b
+ ldr r3, [r0], #4
+ str r3, [r1]
+ cmp r2, r0
+ bne 0b
/* delay - this is all done by guess */
- ldr r0, =0x00001000
+ ldr r0, =0x00001000
1:
- subs r0, r0, #1
- bhi 1b
- ldr r0, =SMRDATA1
+ subs r0, r0, #1
+ bhi 1b
+ ldr r0, =SMRDATA1
ldr r1, _TEXT_BASE
sub r0, r0, r1
- add r2, r0, #176
+ add r2, r0, #176
2:
/* the address */
- ldr r1, [r0], #4
+ ldr r1, [r0], #4
/* the value */
- ldr r3, [r0], #4
- str r3, [r1]
- cmp r2, r0
- bne 2b
+ ldr r3, [r0], #4
+ str r3, [r1]
+ cmp r2, r0
+ bne 2b
/* everything is fine now */
mov pc, lr
diff --git a/cpu/at91rm9200/i2c.c b/cpu/at91rm9200/i2c.c
index d5d6268db..515792c7e 100644
--- a/cpu/at91rm9200/i2c.c
+++ b/cpu/at91rm9200/i2c.c
@@ -60,7 +60,6 @@ at91_xfer(unsigned char chip, unsigned int addr, int alen,
AT91PS_TWI twi = (AT91PS_TWI) AT91_TWI_BASE;
int length;
unsigned char *buf;
-
/* Set the TWI Master Mode Register */
twi->TWI_MMR = (chip << 16) | (alen << 8)
| ((rw == 1) ? AT91C_TWI_MREAD : 0);
@@ -126,13 +125,15 @@ int
i2c_read(unsigned char chip, unsigned int addr, int alen,
unsigned char *buffer, int len)
{
+#ifdef CFG_I2C_EEPROM_ADDR_OVERFLOW
/* we only allow one address byte */
if (alen > 1)
return 1;
-#ifdef CFG_I2C_EEPROM_ADDR_OVERFLOW
/* XXX assume an ATMEL AT24C16 */
if (alen == 1) {
+#if 0 /* EEPROM code already sets this correctly */
chip |= (addr >> 8) & 0xff;
+#endif
addr = addr & 0xff;
}
#endif
@@ -146,22 +147,25 @@ i2c_write(unsigned char chip, unsigned int addr, int alen,
int i;
unsigned char *buf;
+#ifdef CFG_I2C_EEPROM_ADDR_OVERFLOW
/* we only allow one address byte */
if (alen > 1)
return 1;
-#ifdef CFG_I2C_EEPROM_ADDR_OVERFLOW
/* XXX assume an ATMEL AT24C16 */
if (alen == 1) {
buf = buffer;
/* do single byte writes */
for (i = 0; i < len; i++) {
+#if 0 /* EEPROM code already sets this correctly */
chip |= (addr >> 8) & 0xff;
+#endif
addr = addr & 0xff;
if (at91_xfer(chip, addr, alen, buf++, 1, 0))
return 1;
+ addr++;
}
+ return 0;
}
- return 0;
#endif
return at91_xfer(chip, addr, alen, buffer, len, 0);
}
diff --git a/include/at91rm9200_i2c.h b/include/at91rm9200_i2c.h
index cb13d9d4d..c2ec2f18e 100644
--- a/include/at91rm9200_i2c.h
+++ b/include/at91rm9200_i2c.h
@@ -1,90 +1,90 @@
-// ----------------------------------------------------------------------------
-// ATMEL Microcontroller Software Support - ROUSSET -
-// ----------------------------------------------------------------------------
-// The software is delivered "AS IS" without warranty or condition of any
-// kind, either express, implied or statutory. This includes without
-// limitation any warranty or condition with respect to merchantability or
-// fitness for any particular purpose, or against the infringements of
-// intellectual property rights of others.
-// ----------------------------------------------------------------------------
-// File Name : at91rm9200_i2c.h
-// Object : AT91RM9200 / TWI definitions
-// Generated : AT91 SW Application Group 12/03/2002 (10:48:02)
-//
-// ----------------------------------------------------------------------------
+/* ---------------------------------------------------------------------------- */
+/* ATMEL Microcontroller Software Support - ROUSSET - */
+/* ---------------------------------------------------------------------------- */
+/* The software is delivered "AS IS" without warranty or condition of any */
+/* kind, either express, implied or statutory. This includes without */
+/* limitation any warranty or condition with respect to merchantability or */
+/* fitness for any particular purpose, or against the infringements of */
+/* intellectual property rights of others. */
+/* ---------------------------------------------------------------------------- */
+/* File Name : at91rm9200_i2c.h */
+/* Object : AT91RM9200 / TWI definitions */
+/* Generated : AT91 SW Application Group 12/03/2002 (10:48:02) */
+/* */
+/* ---------------------------------------------------------------------------- */
#ifndef AT91RM9200_TWI_H
#define AT91RM9200_TWI_H
-// *****************************************************************************
-// SOFTWARE API DEFINITION FOR Two-wire Interface
-// *****************************************************************************
+/* ******************************************************************************/
+/* SOFTWARE API DEFINITION FOR Two-wire Interface */
+/* ******************************************************************************/
#ifndef __ASSEMBLY__
typedef struct _AT91S_TWI {
- AT91_REG TWI_CR; // Control Register
- AT91_REG TWI_MMR; // Master Mode Register
- AT91_REG TWI_SMR; // Slave Mode Register
- AT91_REG TWI_IADR; // Internal Address Register
- AT91_REG TWI_CWGR; // Clock Waveform Generator Register
- AT91_REG Reserved0[3]; //
- AT91_REG TWI_SR; // Status Register
- AT91_REG TWI_IER; // Interrupt Enable Register
- AT91_REG TWI_IDR; // Interrupt Disable Register
- AT91_REG TWI_IMR; // Interrupt Mask Register
- AT91_REG TWI_RHR; // Receive Holding Register
- AT91_REG TWI_THR; // Transmit Holding Register
- AT91_REG Reserved1[50]; //
- AT91_REG TWI_RPR; // Receive Pointer Register
- AT91_REG TWI_RCR; // Receive Counter Register
- AT91_REG TWI_TPR; // Transmit Pointer Register
- AT91_REG TWI_TCR; // Transmit Counter Register
- AT91_REG TWI_RNPR; // Receive Next Pointer Register
- AT91_REG TWI_RNCR; // Receive Next Counter Register
- AT91_REG TWI_TNPR; // Transmit Next Pointer Register
- AT91_REG TWI_TNCR; // Transmit Next Counter Register
- AT91_REG TWI_PTCR; // PDC Transfer Control Register
- AT91_REG TWI_PTSR; // PDC Transfer Status Register
+ AT91_REG TWI_CR; /* Control Register */
+ AT91_REG TWI_MMR; /* Master Mode Register */
+ AT91_REG TWI_SMR; /* Slave Mode Register */
+ AT91_REG TWI_IADR; /* Internal Address Register */
+ AT91_REG TWI_CWGR; /* Clock Waveform Generator Register */
+ AT91_REG Reserved0[3];
+ AT91_REG TWI_SR; /* Status Register */
+ AT91_REG TWI_IER; /* Interrupt Enable Register */
+ AT91_REG TWI_IDR; /* Interrupt Disable Register */
+ AT91_REG TWI_IMR; /* Interrupt Mask Register */
+ AT91_REG TWI_RHR; /* Receive Holding Register */
+ AT91_REG TWI_THR; /* Transmit Holding Register */
+ AT91_REG Reserved1[50];
+ AT91_REG TWI_RPR; /* Receive Pointer Register */
+ AT91_REG TWI_RCR; /* Receive Counter Register */
+ AT91_REG TWI_TPR; /* Transmit Pointer Register */
+ AT91_REG TWI_TCR; /* Transmit Counter Register */
+ AT91_REG TWI_RNPR; /* Receive Next Pointer Register */
+ AT91_REG TWI_RNCR; /* Receive Next Counter Register */
+ AT91_REG TWI_TNPR; /* Transmit Next Pointer Register */
+ AT91_REG TWI_TNCR; /* Transmit Next Counter Register */
+ AT91_REG TWI_PTCR; /* PDC Transfer Control Register */
+ AT91_REG TWI_PTSR; /* PDC Transfer Status Register */
} AT91S_TWI, *AT91PS_TWI;
#endif
-// -------- TWI_CR : (TWI Offset: 0x0) TWI Control Register --------
-#define AT91C_TWI_START ( 0x1 << 0) // (TWI) Send a START Condition
-#define AT91C_TWI_STOP ( 0x1 << 1) // (TWI) Send a STOP Condition
-#define AT91C_TWI_MSEN ( 0x1 << 2) // (TWI) TWI Master Transfer Enabled
-#define AT91C_TWI_MSDIS ( 0x1 << 3) // (TWI) TWI Master Transfer Disabled
-#define AT91C_TWI_SVEN ( 0x1 << 4) // (TWI) TWI Slave Transfer Enabled
-#define AT91C_TWI_SVDIS ( 0x1 << 5) // (TWI) TWI Slave Transfer Disabled
-#define AT91C_TWI_SWRST ( 0x1 << 7) // (TWI) Software Reset
-// -------- TWI_MMR : (TWI Offset: 0x4) TWI Master Mode Register --------
-#define AT91C_TWI_IADRSZ ( 0x3 << 8) // (TWI) Internal Device Address Size
-#define AT91C_TWI_IADRSZ_NO ( 0x0 << 8) // (TWI) No internal device address
-#define AT91C_TWI_IADRSZ_1_BYTE ( 0x1 << 8) // (TWI) One-byte internal device address
-#define AT91C_TWI_IADRSZ_2_BYTE ( 0x2 << 8) // (TWI) Two-byte internal device address
-#define AT91C_TWI_IADRSZ_3_BYTE ( 0x3 << 8) // (TWI) Three-byte internal device address
-#define AT91C_TWI_MREAD ( 0x1 << 12) // (TWI) Master Read Direction
-#define AT91C_TWI_DADR ( 0x7F << 6) // (TWI) Device Address
-// -------- TWI_SMR : (TWI Offset: 0x8) TWI Slave Mode Register --------
-#define AT91C_TWI_SADR ( 0x7F << 16) // (TWI) Slave Device Address
-// -------- TWI_CWGR : (TWI Offset: 0x10) TWI Clock Waveform Generator Register --------
-#define AT91C_TWI_CLDIV ( 0xFF << 0) // (TWI) Clock Low Divider
-#define AT91C_TWI_CHDIV ( 0xFF << 8) // (TWI) Clock High Divider
-#define AT91C_TWI_CKDIV ( 0x7 << 16) // (TWI) Clock Divider
-// -------- TWI_SR : (TWI Offset: 0x20) TWI Status Register --------
-#define AT91C_TWI_TXCOMP ( 0x1 << 0) // (TWI) Transmission Completed
-#define AT91C_TWI_RXRDY ( 0x1 << 1) // (TWI) Receive holding register ReaDY
-#define AT91C_TWI_TXRDY ( 0x1 << 2) // (TWI) Transmit holding register ReaDY
-#define AT91C_TWI_SVREAD ( 0x1 << 3) // (TWI) Slave Read
-#define AT91C_TWI_SVACC ( 0x1 << 4) // (TWI) Slave Access
-#define AT91C_TWI_GCACC ( 0x1 << 5) // (TWI) General Call Access
-#define AT91C_TWI_OVRE ( 0x1 << 6) // (TWI) Overrun Error
-#define AT91C_TWI_UNRE ( 0x1 << 7) // (TWI) Underrun Error
-#define AT91C_TWI_NACK ( 0x1 << 8) // (TWI) Not Acknowledged
-#define AT91C_TWI_ARBLST ( 0x1 << 9) // (TWI) Arbitration Lost
-// -------- TWI_IER : (TWI Offset: 0x24) TWI Interrupt Enable Register --------
-// -------- TWI_IDR : (TWI Offset: 0x28) TWI Interrupt Disable Register --------
-// -------- TWI_IMR : (TWI Offset: 0x2c) TWI Interrupt Mask Register --------
+/* -------- TWI_CR : (TWI Offset: 0x0) TWI Control Register -------- */
+#define AT91C_TWI_START (0x1 << 0) /* (TWI) Send a START Condition */
+#define AT91C_TWI_STOP (0x1 << 1) /* (TWI) Send a STOP Condition */
+#define AT91C_TWI_MSEN (0x1 << 2) /* (TWI) TWI Master Transfer Enabled */
+#define AT91C_TWI_MSDIS (0x1 << 3) /* (TWI) TWI Master Transfer Disabled */
+#define AT91C_TWI_SVEN (0x1 << 4) /* (TWI) TWI Slave Transfer Enabled */
+#define AT91C_TWI_SVDIS (0x1 << 5) /* (TWI) TWI Slave Transfer Disabled */
+#define AT91C_TWI_SWRST (0x1 << 7) /* (TWI) Software Reset */
+/* -------- TWI_MMR : (TWI Offset: 0x4) TWI Master Mode Register -------- */
+#define AT91C_TWI_IADRSZ (0x3 << 8) /* (TWI) Internal Device Address Size */
+#define AT91C_TWI_IADRSZ_NO (0x0 << 8) /* (TWI) No internal device address */
+#define AT91C_TWI_IADRSZ_1_BYTE (0x1 << 8) /* (TWI) One-byte internal device address */
+#define AT91C_TWI_IADRSZ_2_BYTE (0x2 << 8) /* (TWI) Two-byte internal device address */
+#define AT91C_TWI_IADRSZ_3_BYTE (0x3 << 8) /* (TWI) Three-byte internal device address */
+#define AT91C_TWI_MREAD (0x1 << 12) /* (TWI) Master Read Direction */
+#define AT91C_TWI_DADR (0x7F << 6) /* (TWI) Device Address */
+/* -------- TWI_SMR : (TWI Offset: 0x8) TWI Slave Mode Register -------- */
+#define AT91C_TWI_SADR (0x7F << 16) /* (TWI) Slave Device Address */
+/* -------- TWI_CWGR : (TWI Offset: 0x10) TWI Clock Waveform Generator Register -------- */
+#define AT91C_TWI_CLDIV (0xFF << 0) /* (TWI) Clock Low Divider */
+#define AT91C_TWI_CHDIV (0xFF << 8) /* (TWI) Clock High Divider */
+#define AT91C_TWI_CKDIV (0x7 << 16) /* (TWI) Clock Divider */
+/* -------- TWI_SR : (TWI Offset: 0x20) TWI Status Register -------- */
+#define AT91C_TWI_TXCOMP (0x1 << 0) /* (TWI) Transmission Completed */
+#define AT91C_TWI_RXRDY (0x1 << 1) /* (TWI) Receive holding register ReaDY */
+#define AT91C_TWI_TXRDY (0x1 << 2) /* (TWI) Transmit holding register ReaDY*/
+#define AT91C_TWI_SVREAD (0x1 << 3) /* (TWI) Slave Read */
+#define AT91C_TWI_SVACC (0x1 << 4) /* (TWI) Slave Access */
+#define AT91C_TWI_GCACC (0x1 << 5) /* (TWI) General Call Access */
+#define AT91C_TWI_OVRE (0x1 << 6) /* (TWI) Overrun Error */
+#define AT91C_TWI_UNRE (0x1 << 7) /* (TWI) Underrun Error */
+#define AT91C_TWI_NACK (0x1 << 8) /* (TWI) Not Acknowledged */
+#define AT91C_TWI_ARBLST (0x1 << 9) /* (TWI) Arbitration Lost */
+/* -------- TWI_IER : (TWI Offset: 0x24) TWI Interrupt Enable Register -------- */
+/* -------- TWI_IDR : (TWI Offset: 0x28) TWI Interrupt Disable Register ------- */
+/* -------- TWI_IMR : (TWI Offset: 0x2c) TWI Interrupt Mask Register -------- */
/*
i2c Support for Atmel's AT91RM9200 Two-Wire Interface
@@ -120,7 +120,7 @@ typedef struct _AT91S_TWI {
#endif
#define AT91C_TWI_CLDIV3 ((AT91C_TWI_CLDIV2 + (4 - AT91C_TWI_CLDIV2 % 4)) >> 2)
-#define AT91C_EEPROM_I2C_ADDRESS (0x50 << 16)
+#define AT91C_EEPROM_I2C_ADDRESS (0x50 << 16)
-#endif
-#endif
+#endif /* __ASSEMBLY__ */
+#endif /* AT91RM9200_TWI_H */
diff --git a/rtc/Makefile b/rtc/Makefile
index 71fadeafd..4ceac7693 100644
--- a/rtc/Makefile
+++ b/rtc/Makefile
@@ -31,7 +31,7 @@ OBJS = date.o \
ds12887.o ds1302.o ds1306.o ds1307.o ds1337.o \
ds1556.o ds164x.o ds174x.o \
m41t11.o max6900.o m48t35ax.o mc146818.o mk48t59.o \
- mpc5xxx.o mpc8xx.o pcf8563.o s3c24x0_rtc.o
+ mpc5xxx.o mpc8xx.o pcf8563.o s3c24x0_rtc.o rs5c372.o
all: $(LIB)
diff --git a/rtc/rs5c372.c b/rtc/rs5c372.c
new file mode 100644
index 000000000..0f8ec6224
--- /dev/null
+++ b/rtc/rs5c372.c
@@ -0,0 +1,303 @@
+/*
+ * rs5c372.c
+ *
+ * Device driver for Ricoh's Real Time Controller RS5C372A.
+ *
+ * Copyright (C) 2004 Gary Jennejohn garyj@denx.de
+ *
+ * Based in part in ds1307.c -
+ * (C) Copyright 2001, 2002, 2003
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ * Keith Outwater, keith_outwater@mvis.com`
+ * Steven Scholz, steven.scholz@imc-berlin.de
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <command.h>
+#include <rtc.h>
+#include <i2c.h>
+
+#if defined(CONFIG_RTC_RS5C372A) && (CONFIG_COMMANDS & CFG_CMD_DATE)
+/*
+ * Reads are always done starting with register 15, which requires some
+ * jumping-through-hoops to access the data correctly.
+ *
+ * Writes are always done starting with register 0.
+ */
+
+#define DEBUG 0
+
+#if DEBUG
+static unsigned int rtc_debug = DEBUG;
+#else
+#define rtc_debug 0 /* gcc will remove all the debug code for us */
+#endif
+
+#ifndef CFG_I2C_RTC_ADDR
+#define CFG_I2C_RTC_ADDR 0x32
+#endif
+
+#define RS5C372_RAM_SIZE 0x10
+#define RATE_32000HZ 0x80 /* Rate Select 32.000KHz */
+#define RATE_32768HZ 0x00 /* Rate Select 32.768KHz */
+
+#define STATUS_XPT 0x10 /* data invalid because voltage was 0 */
+
+#define USE_24HOUR_MODE 0x20
+#define TWELVE_HOUR_MODE(n) ((((n) >> 5) & 1) == 0)
+#define HOURS_AP(n) (((n) >> 5) & 1)
+#define HOURS_12(n) bcd2bin((n) & 0x1F)
+#define HOURS_24(n) bcd2bin((n) & 0x3F)
+
+
+static uchar bin2bcd (unsigned int n);
+static unsigned bcd2bin (uchar c);
+
+static int setup_done = 0;
+
+static int
+rs5c372_readram(char *buf, int len)
+{
+ int ret;
+
+ ret = i2c_read(CFG_I2C_RTC_ADDR, 0, 0, buf, len);
+ if (ret != 0) {
+ printf("%s: failed to read\n", __FUNCTION__);
+ return ret;
+ }
+
+ if (buf[0] & STATUS_XPT)
+ printf("### Warning: RTC lost power\n");
+
+ return ret;
+}
+
+static void
+rs5c372_enable(void)
+{
+ unsigned char buf[RS5C372_RAM_SIZE + 1];
+ int ret;
+
+
+ /* note that this returns reg. 15 in buf[1] */
+ ret = rs5c372_readram(&buf[1], RS5C372_RAM_SIZE);
+ if (ret != 0) {
+ printf("%s: failed\n", __FUNCTION__);
+ return;
+ }
+
+ buf[0] = 0;
+ /* we want to start writing at register 0 so we have to copy the */
+ /* register contents up one slot */
+ for (ret = 2; ret < 9; ret++)
+ buf[ret - 1] = buf[ret];
+ /* registers 0 to 6 (time values) are not touched */
+ buf[8] = RATE_32768HZ; /* reg. 7 */
+ buf[9] = 0; /* reg. 8 */
+ buf[10] = 0; /* reg. 9 */
+ buf[11] = 0; /* reg. 10 */
+ buf[12] = 0; /* reg. 11 */
+ buf[13] = 0; /* reg. 12 */
+ buf[14] = 0; /* reg. 13 */
+ buf[15] = 0; /* reg. 14 */
+ buf[16] = USE_24HOUR_MODE; /* reg. 15 */
+ ret = i2c_write(CFG_I2C_RTC_ADDR, 0, 0, buf, RS5C372_RAM_SIZE+1);
+ if (ret != 0) {
+ printf("%s: failed\n", __FUNCTION__);
+ return;
+ }
+ setup_done = 1;
+
+ return;
+}
+
+static void
+rs5c372_convert_to_time(struct rtc_time *dt, char *buf)
+{
+ /* buf[0] is register 15 */
+ dt->tm_sec = bcd2bin(buf[1]);
+ dt->tm_min = bcd2bin(buf[2]);
+
+ if (TWELVE_HOUR_MODE(buf[0])) {
+ dt->tm_hour = HOURS_12(buf[3]);
+ if (HOURS_AP(buf[3])) /* PM */
+ dt->tm_hour += 12;
+ } else /* 24-hour-mode */
+ dt->tm_hour = HOURS_24(buf[3]);
+
+ dt->tm_mday = bcd2bin(buf[5]);
+ dt->tm_mon = bcd2bin(buf[6]);
+ dt->tm_year = bcd2bin(buf[7]);
+ if (dt->tm_year >= 70)
+ dt->tm_year += 1900;
+ else
+ dt->tm_year += 2000;
+ /* 0 is Sunday */
+ dt->tm_wday = bcd2bin(buf[4] & 0x07);
+ dt->tm_yday = 0;
+ dt->tm_isdst= 0;
+
+ if(rtc_debug > 2) {
+ printf("rs5c372_convert_to_time: year = %d\n", dt->tm_year);
+ printf("rs5c372_convert_to_time: mon = %d\n", dt->tm_mon);
+ printf("rs5c372_convert_to_time: mday = %d\n", dt->tm_mday);
+ printf("rs5c372_convert_to_time: hour = %d\n", dt->tm_hour);
+ printf("rs5c372_convert_to_time: min = %d\n", dt->tm_min);
+ printf("rs5c372_convert_to_time: sec = %d\n", dt->tm_sec);
+ }
+}
+
+/*
+ * Get the current time from the RTC
+ */
+void
+rtc_get (struct rtc_time *tmp)
+{
+ unsigned char buf[RS5C372_RAM_SIZE];
+ int ret;
+
+ if (!setup_done)
+ rs5c372_enable();
+
+ if (!setup_done)
+ return;
+
+ memset(buf, 0, sizeof(buf));
+
+ /* note that this returns reg. 15 in buf[0] */
+ ret = rs5c372_readram(buf, RS5C372_RAM_SIZE);
+ if (ret != 0) {
+ printf("%s: failed\n", __FUNCTION__);
+ return;
+ }
+
+ rs5c372_convert_to_time(tmp, buf);
+
+ return;
+}
+
+/*
+ * Set the RTC
+ */
+void
+rtc_set (struct rtc_time *tmp)
+{
+ unsigned char buf[8], reg15;
+ int ret;
+
+ if (!setup_done)
+ rs5c372_enable();
+
+ if (!setup_done)
+ return;
+
+ if(rtc_debug > 2) {
+ printf("rtc_set: tm_year = %d\n", tmp->tm_year);
+ printf("rtc_set: tm_mon = %d\n", tmp->tm_mon);
+ printf("rtc_set: tm_mday = %d\n", tmp->tm_mday);
+ printf("rtc_set: tm_hour = %d\n", tmp->tm_hour);
+ printf("rtc_set: tm_min = %d\n", tmp->tm_min);
+ printf("rtc_set: tm_sec = %d\n", tmp->tm_sec);
+ }
+
+ memset(buf, 0, sizeof(buf));
+
+ /* only read register 15 */
+ ret = i2c_read(CFG_I2C_RTC_ADDR, 0, 0, buf, 1);
+
+ if (ret == 0) {
+ /* need to save register 15 */
+ reg15 = buf[0];
+ buf[0] = 0; /* register address on RS5C372 */
+ buf[1] = bin2bcd(tmp->tm_sec);
+ buf[2] = bin2bcd(tmp->tm_min);
+ /* need to handle 12 hour mode */
+ if (TWELVE_HOUR_MODE(reg15)) {
+ if (tmp->tm_hour >= 12) { /* PM */
+ /* 12 PM is a special case */
+ if (tmp->tm_hour == 12)
+ buf[3] = bin2bcd(tmp->tm_hour);
+ else
+ buf[3] = bin2bcd(tmp->tm_hour - 12);
+ buf[3] |= 0x20;
+ }
+ } else {
+ buf[3] = bin2bcd(tmp->tm_hour);
+ }
+
+ buf[4] = bin2bcd(tmp->tm_wday);
+ buf[5] = bin2bcd(tmp->tm_mday);
+ buf[6] = bin2bcd(tmp->tm_mon);
+ if (tmp->tm_year < 1970 || tmp->tm_year > 2069)
+ printf("WARNING: year should be between 1970 and 2069!\n");
+ buf[7] = bin2bcd(tmp->tm_year % 100);
+
+ ret = i2c_write(CFG_I2C_RTC_ADDR, 0, 0, buf, 8);
+ if (ret != 0)
+ printf("rs5c372_set_datetime(), i2c_master_send() returned %d\n",ret);
+ }
+
+ return;
+}
+
+/*
+ * Reset the RTC. We set the date back to 1970-01-01.
+ */
+void
+rtc_reset (void)
+{
+ struct rtc_time tmp;
+
+ if (!setup_done)
+ rs5c372_enable();
+
+ if (!setup_done)
+ return;
+
+ tmp.tm_year = 1970;
+ tmp.tm_mon = 1;
+ /* Jan. 1, 1970 was a Thursday */
+ tmp.tm_wday= 4;
+ tmp.tm_mday= 1;
+ tmp.tm_hour = 0;
+ tmp.tm_min = 0;
+ tmp.tm_sec = 0;
+
+ rtc_set(&tmp);
+
+ printf ("RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n",
+ tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
+ tmp.tm_hour, tmp.tm_min, tmp.tm_sec);
+
+ return;
+}
+
+static unsigned int
+bcd2bin (unsigned char n)
+{
+ return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
+}
+
+static unsigned char
+bin2bcd (unsigned int n)
+{
+ return (((n / 10) << 4) | (n % 10));
+}
+#endif /* defined(CONFIG_RTC_RS5C372A) && (CONFIG_COMMANDS & CFG_CMD_DATE) */