1 files changed, 280 insertions, 0 deletions

diff --git a/firmware/drivers/rtc/rtc_m41st84w.c b/firmware/drivers/rtc/rtc_m41st84w.c
new file mode 100644
index 0000000000..1d76867e13
--- /dev/null
+++ b/firmware/drivers/rtc/rtc_m41st84w.c
@@ -0,0 +1,280 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Linus Nielsen Feltzing, Uwe Freese, Laurent Baum
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "config.h"
+#include "i2c.h"
+#include "rtc.h"
+#include "kernel.h"
+#include "system.h"
+#include <stdbool.h>
+
+#define RTC_ADR 0xd0
+#define RTC_DEV_WRITE   (RTC_ADR | 0x00)
+#define RTC_DEV_READ    (RTC_ADR | 0x01)
+
+void rtc_init(void)
+{
+    unsigned char data; 
+
+#ifdef HAVE_ALARM_MOD
+    /* Check + save alarm bit first, before the power thread starts watching */
+    rtc_check_alarm_started(false);
+#endif
+
+    rtc_write(0x13, 0x10); /* 32 kHz square wave */
+
+    /* Clear the Stop bit if it is set */
+    data = rtc_read(0x01);
+    if(data & 0x80)
+        rtc_write(0x01, 0x00);
+
+    /* Clear the HT bit if it is set */
+    data = rtc_read(0x0c);
+
+    if(data & 0x40)
+    {
+        data &= ~0x40;
+        rtc_write(0x0c,data);
+    }
+    
+#ifdef HAVE_ALARM_MOD    
+
+    /* Clear Trec bit, write-protecting the RTC for 200ms when shutting off */
+    /* without this, the alarm won't work! */
+    
+    data = rtc_read(0x04);
+    if (data & 0x80)
+    {
+        data &= ~0x80;
+        rtc_write(0x04, data);
+    }
+
+    /* Also, make sure that the OUT bit in register 8 is 1,
+       otherwise the player can't be turned off. */
+    rtc_write(8, rtc_read(8) | 0x80);
+    
+#endif
+}
+
+#ifdef HAVE_ALARM_MOD    
+
+/* check whether the unit has been started by the RTC alarm function */
+/* (check for AF, which => started using wakeup alarm) */
+bool rtc_check_alarm_started(bool release_alarm)
+{
+    static bool alarm_state, run_before;
+    bool rc;
+
+    if (run_before) {
+        rc = alarm_state;
+        alarm_state &= ~release_alarm;
+    } else { 
+        /* This call resets AF, so we store the state for later recall */ 
+        rc = alarm_state = rtc_check_alarm_flag();
+        run_before = true; 
+    }
+ 
+    return rc;
+}
+/*
+ * Checks the AL register.  This call resets AL once read.
+ *
+ * We're only interested if ABE is set.  AL is still raised regardless
+ * even if the unit is off when the alarm occurs.
+ */
+bool rtc_check_alarm_flag(void) 
+{
+    return ( ( (rtc_read(0x0f) & 0x40) != 0) &&
+               (rtc_read(0x0a) & 0x20)  );
+}
+
+/* set alarm time registers to the given time (repeat once per day) */
+void rtc_set_alarm(int h, int m)
+{
+    unsigned char data;
+
+    /* for daily alarm, RPT5=RPT4=on, RPT1=RPT2=RPT3=off */
+    
+    rtc_write(0x0e, 0x00);                       /* seconds 0 and RTP1 */
+    rtc_write(0x0d, ((m / 10) << 4) | (m % 10)); /* minutes and RPT2 */
+    rtc_write(0x0c, ((h / 10) << 4) | (h % 10)); /* hour and RPT3 */
+    rtc_write(0x0b, 0xc1);                       /* set date 01 and RPT4 and RTP5 */
+    
+    /* set month to 1, if it's invalid, the rtc does an alarm every second instead */
+    data = rtc_read(0x0a);
+    data &= 0xe0;
+    data |= 0x01;
+    rtc_write(0x0a, data);
+}
+
+/* read out the current alarm time */
+void rtc_get_alarm(int *h, int *m)
+{
+    unsigned char data;
+
+    data = rtc_read(0x0c);
+    *h = ((data & 0x30) >> 4) * 10 + (data & 0x0f);
+    
+    data = rtc_read(0x0d);
+    *m = ((data & 0x70) >> 4) * 10 + (data & 0x0f);
+}
+
+/* turn alarm on or off by setting the alarm flag enable */
+/* the alarm is automatically disabled when the RTC gets Vcc power at startup */
+/* avoid that an alarm occurs when the device is on because this locks the ON key forever */
+/* returns false if alarm was set and alarm flag (output) is off */
+/* returns true if alarm flag went on, which would lock the device, so the alarm was disabled again */
+bool rtc_enable_alarm(bool enable)
+{
+    unsigned char data = rtc_read(0x0a);
+    if (enable)
+    {
+        data |= 0xa0; /* turn bit d7=AFE and d5=ABE on */
+    }
+    else
+        data &= 0x5f; /* turn bit d7=AFE and d5=ABE off */
+    rtc_write(0x0a, data);
+    
+    /* check if alarm flag AF is off (as it should be) */
+    /* in some cases enabling the alarm results in an activated AF flag */
+    /* this should not happen, but it does */
+    /* if you know why, tell me! */
+    /* for now, we try again forever in this case */
+    while (rtc_check_alarm_flag()) /* on */
+    {
+        data &= 0x5f; /* turn bit d7=AFE and d5=ABE off */
+        rtc_write(0x0a, data);
+        sleep(HZ / 10);
+        rtc_check_alarm_flag();
+        data |= 0xa0; /* turn bit d7=AFE and d5=ABE on */
+        rtc_write(0x0a, data);
+    }
+
+    return false; /* all ok */
+}
+
+#endif /* HAVE_ALARM_MOD */
+
+int rtc_write(unsigned char address, unsigned char value)
+{
+    int ret = 0;
+    unsigned char buf[2];
+
+    i2c_begin();
+    
+    buf[0] = address;
+    buf[1] = value;
+
+    /* send run command */
+    if (i2c_write(RTC_DEV_WRITE,buf,2))
+    {
+        ret = -1;
+    }
+
+    i2c_end();
+    return ret;
+}
+
+int rtc_read(unsigned char address)
+{
+    int value = -1;
+    unsigned char buf[1];
+
+    i2c_begin();
+    
+    buf[0] = address;
+
+    /* send read command */
+    if (i2c_write(RTC_DEV_READ,buf,1) >= 0)
+    {
+        i2c_start();
+        i2c_outb(RTC_DEV_READ);
+        if (i2c_getack())
+        {
+            value = i2c_inb(1);
+        }
+    }
+
+    i2c_stop();
+
+    i2c_end();
+    return value;
+}
+
+int rtc_read_multiple(unsigned char address, unsigned char *buf, int numbytes)
+{
+    int ret = 0;
+    unsigned char obuf[1];
+    int i;
+
+    i2c_begin();
+    
+    obuf[0] = address;
+
+    /* send read command */
+    if (i2c_write(RTC_DEV_READ, obuf, 1) >= 0)
+    {
+        i2c_start();
+        i2c_outb(RTC_DEV_READ);
+        if (i2c_getack())
+        {
+            for(i = 0;i < numbytes-1;i++)
+                buf[i] = i2c_inb(0);
+            
+            buf[i] = i2c_inb(1);
+        }
+        else
+        {
+            ret = -1;
+        }
+    }
+
+    i2c_stop();
+
+    i2c_end();
+    return ret;
+}
+
+int rtc_read_datetime(unsigned char* buf) {
+    int rc;
+
+    rc = rtc_read_multiple(1, buf, 7);
+
+    /* Adjust weekday */
+    if(buf[3] == 7)
+        buf[3]=0;
+
+    return rc;
+}
+
+int rtc_write_datetime(unsigned char* buf) {
+    int i;
+    int rc = 0;
+    
+    /* Adjust weekday */
+    if(buf[3] == 0)
+        buf[3] = 7;
+
+    for (i = 0; i < 7 ; i++)
+    {
+        rc |= rtc_write(i+1, buf[i]);
+    }
+    rc |= rtc_write(8, 0x80); /* Out=1, calibration = 0 */
+
+    return rc;
+}