HD300 - add basic RTC support

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28697 a1c6a512-1295-4272-9138-f99709370657

firmware/SOURCES

@@ -252,6 +252,8 @@ drivers/rtc/rtc_tcc77x.c
 drivers/rtc/rtc_jz4740.c
 #elif (CONFIG_RTC == RTC_S35390A)
 drivers/rtc/rtc_s35390a.c
+#elif (CONFIG_RTC == RTC_S35380A)
+drivers/rtc/rtc_s35380a.c
 #elif (CONFIG_RTC == RTC_D2)
 drivers/rtc/rtc_d2.c
 #endif /* (CONFIG_RTC == RTC_) */

firmware/drivers/rtc/rtc_s35380a.c

@@ -0,0 +1,128 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * adopted for HD300 by Marcin Bukat
+ * Copyright (C) 2009 by Bertrik Sikken
+ * Copyright (C) 2008 by Robert Kukla 
+ * 
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "config.h"
+#include "rtc.h" 
+#include "i2c-coldfire.h"
+
+/*  Driver for the Seiko S35380A real-time clock chip with i2c interface
+
+    This driver was derived from rtc_s3539a.c and adapted for the MPIO HD300
+ */
+
+#define RTC_ADDR   0x60
+
+#define STATUS_REG1     0
+#define STATUS_REG2     1
+#define REALTIME_DATA1  2
+#define REALTIME_DATA2  3
+#define INT1_REG        4
+#define INT2_REG        5
+#define CLOCK_CORR_REG  6
+#define FREE_REG        7
+
+/* STATUS_REG1 flags */
+#define STATUS_REG1_POC   0x80
+#define STATUS_REG1_BLD   0x40
+#define STATUS_REG1_INT2  0x20
+#define STATUS_REG1_INT1  0x10
+#define STATUS_REG1_SC1   0x08
+#define STATUS_REG1_SC0   0x04
+#define STATUS_REG1_H1224 0x02
+#define STATUS_REG1_RESET 0x01
+
+
+static void reverse_bits(unsigned char* v, int size)
+{
+    static const unsigned char flipnibble[] =
+        {0x00, 0x08, 0x04, 0x0C, 0x02, 0x0A, 0x06, 0x0E,
+         0x01, 0x09, 0x05, 0x0D, 0x03, 0x0B, 0x07, 0x0F};
+    int i;
+                                            
+    for (i = 0; i < size; i++) {
+        v[i] = (flipnibble[v[i] & 0x0F] << 4) |
+                flipnibble[(v[i] >> 4) & 0x0F];
+    }
+}    
+
+void rtc_init(void)
+{
+    unsigned char status_reg;
+    i2c_read(I2C_IFACE_1, RTC_ADDR | (STATUS_REG1<<1), &status_reg, 1);
+
+    if ( (status_reg & STATUS_REG1_POC) ||
+         (status_reg & STATUS_REG1_BLD) )
+    {
+        /* perform rtc reset*/
+        status_reg |= STATUS_REG1_RESET;
+        i2c_write(I2C_IFACE_1, RTC_ADDR | (STATUS_REG1<<1), &status_reg, 1);
+    }
+}
+
+int rtc_read_datetime(struct tm *tm)
+{
+    unsigned char buf[7];
+    unsigned int i;
+    int ret;
+
+    ret = i2c_read(I2C_IFACE_1, RTC_ADDR | (REALTIME_DATA1<<1), buf, sizeof(buf));
+    reverse_bits(buf, sizeof(buf));
+
+    buf[4] &= 0x3f; /* mask out p.m. flag */
+
+    for (i = 0; i < sizeof(buf); i++)
+        buf[i] = BCD2DEC(buf[i]);
+
+    tm->tm_sec = buf[6];
+    tm->tm_min = buf[5];
+    tm->tm_hour = buf[4];
+    tm->tm_wday = buf[3];
+    tm->tm_mday = buf[2];
+    tm->tm_mon = buf[1] - 1;
+    tm->tm_year = buf[0] + 100;
+    
+    return ret;
+}
+
+int rtc_write_datetime(const struct tm *tm)
+{
+    unsigned char buf[7];
+    unsigned int i;
+    int ret;
+
+    buf[6] = tm->tm_sec;
+    buf[5] = tm->tm_min;
+    buf[4] = tm->tm_hour;
+    buf[3] = tm->tm_wday;
+    buf[2] = tm->tm_mday;
+    buf[1] = tm->tm_mon + 1;
+    buf[0] = tm->tm_year - 100;
+
+    for (i = 0; i < sizeof(buf); i++)
+        buf[i] = DEC2BCD(buf[i]);
+
+    reverse_bits(buf, sizeof(buf));
+    ret = i2c_write(I2C_IFACE_1, RTC_ADDR | (REALTIME_DATA1<<1), buf, sizeof(buf));
+
+    return ret;
+}
+

firmware/export/config.h

@@ -280,6 +280,7 @@ Lyre prototype 1 */
 #define RTC_JZ47XX   16 /* Ingenic Jz47XX */
 #define RTC_NANO2G   17 /* This seems to be a PCF5063x */
 #define RTC_D2       18 /* Either PCF50606 or PCF50635 */
+#define RTC_S35380A  19 
 
 /* USB On-the-go */
 #define USBOTG_M66591   6591 /* M:Robe 500 */

firmware/export/config/mpiohd300.h

@@ -73,7 +73,7 @@
 #define CONFIG_CODEC SWCODEC
 
 /* Define this if you have RTC */
-#define CONFIG_RTC RTC_S35390A
+#define CONFIG_RTC RTC_S35380A
 
 #define CONFIG_LCD LCD_S1D15E06