H300 FM radio support, with help from Peter D'Hoye

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8237 a1c6a512-1295-4272-9138-f99709370657

2 files changed, 44 insertions, 15 deletions

diff --git a/firmware/drivers/fmradio_i2c.c b/firmware/drivers/fmradio_i2c.c
index 4e491093f0..2475084696 100644
--- a/firmware/drivers/fmradio_i2c.c
+++ b/firmware/drivers/fmradio_i2c.c
@@ -30,18 +30,38 @@
 /* cute little functions, atomic read-modify-write */
 /* SDA is GPIO1,23 */
 
-#define SDA_LO     and_l(~0x00800000, &GPIO1_OUT)    // and_b(~0x10, &PBDRL)
-#define SDA_HI      or_l( 0x00800000, &GPIO1_OUT)    //  or_b( 0x10, &PBDRL)
-#define SDA_INPUT  and_l(~0x00800000, &GPIO1_ENABLE) // and_b(~0x10, &PBIORL)
-#define SDA_OUTPUT  or_l( 0x00800000, &GPIO1_ENABLE) //  or_b( 0x10, &PBIORL)
-#define SDA             ( 0x00800000 & GPIO1_READ)   //      (PBDR & 0x0010)
-
-/* SCL is GPIO, 3 */
-#define SCL_INPUT  and_l(~0x00000008, &GPIO_ENABLE)  // and_b(~0x02, &PBIORL)
-#define SCL_OUTPUT  or_l( 0x00000008, &GPIO_ENABLE)  //  or_b( 0x02, &PBIORL) 
-#define SCL_LO     and_l(~0x00000008, &GPIO_OUT)     // and_b(~0x02, &PBDRL)
-#define SCL_HI      or_l( 0x00000008, &GPIO_OUT)     //  or_b( 0x02, &PBDRL)
-#define SCL             ( 0x00000008 & GPIO_READ)    // (PBDR & 0x0002)
+#ifdef IRIVER_H300_SERIES
+
+/* SDA is GPIO57 */
+#define SDA_LO     and_l(~0x02000000, &GPIO1_OUT)
+#define SDA_HI      or_l( 0x02000000, &GPIO1_OUT)
+#define SDA_INPUT  and_l(~0x02000000, &GPIO1_ENABLE)
+#define SDA_OUTPUT  or_l( 0x02000000, &GPIO1_ENABLE)
+#define SDA             ( 0x02000000 & GPIO1_READ)
+
+/* SCL is GPIO56 */
+#define SCL_INPUT  and_l(~0x01000000, &GPIO1_ENABLE)
+#define SCL_OUTPUT  or_l( 0x01000000, &GPIO1_ENABLE)
+#define SCL_LO     and_l(~0x01000000, &GPIO1_OUT)
+#define SCL_HI      or_l( 0x01000000, &GPIO1_OUT)
+#define SCL             ( 0x01000000 & GPIO1_READ)
+
+#else
+
+/* SDA is GPIO55 */
+#define SDA_LO     and_l(~0x00800000, &GPIO1_OUT)
+#define SDA_HI      or_l( 0x00800000, &GPIO1_OUT)
+#define SDA_INPUT  and_l(~0x00800000, &GPIO1_ENABLE)
+#define SDA_OUTPUT  or_l( 0x00800000, &GPIO1_ENABLE)
+#define SDA             ( 0x00800000 & GPIO1_READ)
+
+/* SCL is GPIO3 */
+#define SCL_INPUT  and_l(~0x00000008, &GPIO_ENABLE)
+#define SCL_OUTPUT  or_l( 0x00000008, &GPIO_ENABLE)
+#define SCL_LO     and_l(~0x00000008, &GPIO_OUT)
+#define SCL_HI      or_l( 0x00000008, &GPIO_OUT)
+#define SCL             ( 0x00000008 & GPIO_READ)
+#endif
 
 /* delay loop to achieve 400kHz at 120MHz CPU frequency */
 #define DELAY    do { int _x; for(_x=0;_x<22;_x++);} while(0)
@@ -84,8 +104,8 @@ static void fmradio_i2c_ack(void)
     SCL_INPUT;   /* Set the clock to input */
     while(!SCL)  /* and wait for the slave to release it */
     {
-        SCL_OUTPUT;  /* Set the clock to output */
         SCL_HI;
+        SCL_OUTPUT;  /* Set the clock to output */
         SCL_INPUT;   /* Set the clock to input */
         DELAY;
     }
@@ -111,8 +131,8 @@ static int fmradio_i2c_getack(void)
     SCL_INPUT;   /* Set the clock to input */
     while(!SCL)  /* and wait for the slave to release it */
     {
-        SCL_OUTPUT;  /* Set the clock to output */
         SCL_HI;
+        SCL_OUTPUT;  /* Set the clock to output */
         SCL_INPUT;   /* Set the clock to input */
         DELAY;
     }
@@ -160,10 +180,12 @@ static unsigned char fmradio_i2c_inb(void)
    /* clock in each bit, MSB first */
    for ( i=0x80; i; i>>=1 ) {
        SDA_INPUT;   /* And set to input */
-       SCL_HI;
+       DELAY;
        DELAY;
        if ( SDA )
            byte |= i;
+       SCL_HI;
+       DELAY;
        SCL_LO;
        DELAY;
        SDA_OUTPUT;
diff --git a/firmware/drivers/i2c-coldfire.c b/firmware/drivers/i2c-coldfire.c
index 0c83c1cb1a..ffdc4f29de 100644
--- a/firmware/drivers/i2c-coldfire.c
+++ b/firmware/drivers/i2c-coldfire.c
@@ -46,7 +46,14 @@ void i2c_init(void)
     or_l(0x00000008, &GPIO_ENABLE);
     or_l(0x00800000, &GPIO1_FUNCTION);
     or_l(0x00000008, &GPIO_FUNCTION);
+#elif defined(IRIVER_H300_SERIES)
+    /* The FM chip has no pullup for SCL, so we have to bit-bang the
+       I2C for that one. */
+    or_l(0x03000000, &GPIO1_OUT);
+    or_l(0x03000000, &GPIO1_ENABLE);
+    or_l(0x03000000, &GPIO1_FUNCTION);
 #endif
+    
     /* I2C Clock divisor = 576 => 119.952 MHz / 2 / 576 = 104.125 kHz */
     MFDR = 0x14;