spi is shared between the rtc and tsc2100

adds the very begining of the rtc driver (only reads the time currently


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14935 a1c6a512-1295-4272-9138-f99709370657

firmware/SOURCES

@@ -146,6 +146,8 @@ drivers/rtc/rtc_ds1339_ds3231.c
 drivers/rtc/rtc_s3c2440.c
 #elif (CONFIG_RTC == RTC_AS3514)
 drivers/rtc/rtc_as3514.c
+#elif (CONFIG_RTC == RTC_RX5X348AB)
+drivers/rtc/rtc_rx5x348ab.c
 #endif /* (CONFIG_RTC == RTC_) */
 #endif /* SIMULATOR */
 

firmware/drivers/rtc/rtc_rx5x348ab.c

@@ -0,0 +1,35 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id: rtc_as3514.c 12131 2007-01-27 20:48:48Z dan_a $
+ *
+ * Copyright (C) 2007 by Jonathan Gordon
+ *
+ * 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 "spi.h"
+#include "rtc.h"
+#include <stdbool.h>
+
+void rtc_init(void)
+{
+}
+
+int rtc_read_datetime(unsigned char* buf)
+{
+    char command = 0x04; /* burst read from the start of the time/date reg */
+    spi_block_transfer(SPI_target_RX5X348AB,
+                       &command, 1, buf, 7);
+    return 1;
+}

firmware/drivers/tsc2100.c

@@ -30,7 +30,8 @@ void tsc2100_read_values(short *x, short* y, short *z1, short *z2)
     unsigned short command = 0x8000|(page << 11)|(address << 5);
     unsigned char out[] = {command >> 8, command & 0xff};
     unsigned char in[8];
-    spi_block_transfer(out, sizeof(out), in, sizeof(in));
+    spi_block_transfer(SPI_target_TSC2100, 
+                       out, sizeof(out), in, sizeof(in));
 
     *x = (in[0]<<8)|in[1];
     *y = (in[2]<<8)|in[3];
@@ -43,7 +44,8 @@ short tsc2100_readreg(int page, int address)
     unsigned short command = 0x8000|(page << 11)|(address << 5);
     unsigned char out[] = {command >> 8, command & 0xff};
     unsigned char in[2];
-    spi_block_transfer(out, sizeof(out), in, sizeof(in));
+    spi_block_transfer(SPI_target_TSC2100, 
+                       out, sizeof(out), in, sizeof(in));
     return (in[0]<<8)|in[1];
 }
 
@@ -53,7 +55,8 @@ void tsc2100_writereg(int page, int address, short value)
     unsigned short command = 0x8000|(page << 11)|(address << 5);
     unsigned char out[4] = {command >> 8, command & 0xff,
                             value >> 8,   value & 0xff};
-    spi_block_transfer(out, sizeof(out), NULL, 0);
+    spi_block_transfer(SPI_target_TSC2100, 
+                       out, sizeof(out), NULL, 0);
 }
 
 void tsc2100_keyclick(void)

firmware/export/config-mrobe500.h

@@ -62,7 +62,7 @@
 #define CONFIG_CODEC SWCODEC
 
 /* define this if you have a real-time clock */
-//#define CONFIG_RTC RTC_S3C2440
+#define CONFIG_RTC RTC_RX5X348AB
 
 /* Define this for LCD backlight available */
 #define HAVE_BACKLIGHT

firmware/export/config.h

@@ -140,6 +140,7 @@
 #define RTC_AS3514   6 /* Sandisk Sansa e200 series */
 #define RTC_DS1339_DS3231   7 /* h1x0 RTC mod */
 #define RTC_IMX31L   8
+#define RTC_RX5X348AB 9
 
 /* USB On-the-go */
 #define USBOTG_ISP1362 1362 /* iriver H300 */

firmware/export/spi.h

@@ -18,9 +18,6 @@
  ****************************************************************************/
 #ifndef __SPI_H__
 #define __SPI_H__
-
+#include "spi-target.h"
-int spi_block_transfer(const uint8_t *tx_bytes, unsigned int tx_size,
-                             uint8_t *rx_bytes, unsigned int rx_size);
-void spi_init(void);
 
 #endif

firmware/target/arm/tms320dm320/spi-dm320.c

@@ -24,18 +24,43 @@
  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  *  675 Mass Ave, Cambridge, MA 02139, USA.
  */
-
+#include "kernel.h"
 #include "system.h"
+#include "spi.h"
 
 #define GIO_TS_ENABLE  (1<<2)
-#define clr_gio_enable() IO_GIO_BITSET1=GIO_TS_ENABLE
+#define GIO_RTC_ENABLE (1<<12)
-#define set_gio_enable() IO_GIO_BITCLR1=GIO_TS_ENABLE
 
-int spi_block_transfer(const uint8_t *tx_bytes, unsigned int tx_size,
+struct mutex spi_lock;
+
+struct SPI_info {
+    volatile unsigned short *setreg;
+    volatile unsigned short *clrreg;
+    int bit;
+};
+#define reg(a) (PHY_IO_BASE+a)
+struct SPI_info spi_targets[] =
+{
+    [SPI_target_TSC2100]   = { reg(0x0594), reg(0x058E), GIO_TS_ENABLE },
+    [SPI_target_RX5X348AB] = { reg(0x058C), reg(0x0592), GIO_RTC_ENABLE },
+};
+
+static void spi_disable_all_targets(void)
+{
+    int i;
+    for(i=0;i<SPI_MAX_TARGETS;i++)
+    {
+        *spi_targets[i].clrreg = spi_targets[i].bit;
+    }
+}
+
+int spi_block_transfer(enum SPI_target target,
+                       const uint8_t *tx_bytes, unsigned int tx_size,
                              uint8_t *rx_bytes, unsigned int rx_size)
 {
+    spinlock_lock(&spi_lock);
     /* Activate the slave select pin */
-    set_gio_enable();
+    *spi_targets[target].setreg = spi_targets[target].bit;
 
     while (tx_size--)
     {
@@ -58,13 +83,15 @@ int spi_block_transfer(const uint8_t *tx_bytes, unsigned int tx_size,
         *rx_bytes++ = data & 0xff;
     }
 
-    clr_gio_enable();
+    *spi_targets[target].clrreg = spi_targets[target].bit;
     
+    spinlock_unlock(&spi_lock);
     return 0;
 }
 
 void spi_init(void)
 {
+    spinlock_init(&spi_lock);
     /* Set SCLK idle level = 0 */
     IO_SERIAL0_MODE |= (1<<10);
     
@@ -72,6 +99,9 @@ void spi_init(void)
     IO_SERIAL0_TX_ENABLE = 0x0001;
 
     /* Set GIO 18 to output for touch screen slave enable */
-    IO_GIO_DIR1&=~GIO_TS_ENABLE;
+    IO_GIO_DIR1 &= ~GIO_TS_ENABLE;
-    clr_gio_enable();
+    /* Set GIO 12 to output for rtc slave enable */
+    IO_GIO_DIR0 &= ~GIO_RTC_ENABLE;
+    
+    spi_disable_all_targets(); /* make sure only one is ever enabled at a time */
 }

firmware/target/arm/tms320dm320/spi-target.h

@@ -21,9 +21,17 @@
 #define SPI_TARGET_H
 
 #include <inttypes.h>
+#include <stdbool.h>
+
+enum SPI_target {
+    SPI_target_TSC2100 = 0,
+    SPI_target_RX5X348AB,
+    SPI_MAX_TARGETS,
+};
 
 void spi_init(void);
-int spi_block_transfer(const uint8_t *tx_bytes, unsigned int tx_size,
+int spi_block_transfer(enum SPI_target target,
+                       const uint8_t *tx_bytes, unsigned int tx_size,
                              uint8_t *rx_bytes, unsigned int rx_size);
 
 #endif