PCF50606 driver for iAudio X5

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8809 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 171 insertions, 0 deletions

diff --git a/firmware/target/coldfire/iaudio/x5/pcf50606-x5.c b/firmware/target/coldfire/iaudio/x5/pcf50606-x5.c
new file mode 100644
index 0000000000..6f81d38a53
--- /dev/null
+++ b/firmware/target/coldfire/iaudio/x5/pcf50606-x5.c
@@ -0,0 +1,171 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 by Linus Nielsen Feltzing
+ *
+ * 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 "cpu.h"
+#include <stdbool.h>
+#include "kernel.h"
+#include "system.h"
+#include "hwcompat.h"
+#include "logf.h"
+#include "debug.h"
+#include "string.h"
+#include "generic_i2c.h"
+
+void pcf50606_sda_output(void)
+{
+    or_l( 0x00001000, &GPIO1_ENABLE);
+}
+
+void pcf50606_sda_input(void)
+{
+    and_l(~0x00001000, &GPIO1_ENABLE);
+}
+
+void pcf50606_sda_lo(void)
+{
+    and_l(~0x00001000, &GPIO1_OUT);
+}
+
+void pcf50606_sda_hi(void)
+{
+    or_l( 0x00001000, &GPIO1_OUT);
+}
+
+int pcf50606_sda(void)
+{
+    return 0x00001000 & GPIO1_READ;
+}
+
+void pcf50606_scl_output(void)
+{
+    or_l( 0x00000400, &GPIO_ENABLE);
+}
+
+void pcf50606_scl_input(void)
+{
+    and_l(~0x00000400, &GPIO_ENABLE);
+}
+
+int pcf50606_scl(void)
+{
+    return 0x00000400 & GPIO_READ;
+}
+
+void pcf50606_scl_lo(void)
+{
+    and_l(~0x00000400, &GPIO_OUT);
+}
+
+void pcf50606_scl_hi(void)
+{
+    pcf50606_scl_input();
+    while(!pcf50606_scl())
+    {
+    }
+    or_l(0x0400, &GPIO_OUT);
+    pcf50606_scl_output();
+}
+
+void pcf50606_delay(void)
+{
+    do { int _x; for(_x=0;_x<32;_x++);} while(0);
+}
+
+struct i2c_interface pcf50606_i2c = {
+    0x10, /* Address */
+
+    /* Bit-banged interface definitions */
+    pcf50606_scl_hi,  /* Drive SCL high, might sleep on clk stretch */
+    pcf50606_scl_lo,  /* Drive SCL low */
+    pcf50606_sda_hi,  /* Drive SDA high */
+    pcf50606_sda_lo,  /* Drive SDA low */
+    pcf50606_sda_input,  /* Set SDA as input */
+    pcf50606_sda_output, /* Set SDA as output */
+    pcf50606_scl_input,  /* Set SCL as input */
+    pcf50606_scl_output, /* Set SCL as output */
+    pcf50606_scl,      /* Read SCL, returns 0 or nonzero */
+    pcf50606_sda,      /* Read SDA, returns 0 or nonzero */
+
+    pcf50606_delay,  /* START SDA hold time (tHD:SDA) */
+    pcf50606_delay,  /* SDA hold time (tHD:DAT) */
+    pcf50606_delay,  /* SDA setup time (tSU:DAT) */
+    pcf50606_delay,  /* STOP setup time (tSU:STO) */
+    pcf50606_delay,  /* Rep. START setup time (tSU:STA) */
+    pcf50606_delay,  /* SCL high period (tHIGH) */
+};
+
+int pcf50606_read_multiple(int address, unsigned char* buf, int count)
+{
+    return i2c_read_data(0x10, address, buf, count);
+}
+
+int pcf50606_read(int address)
+{
+    int ret;
+    unsigned char c;
+
+    ret = pcf50606_read_multiple(address, &c, 1);
+    if(ret >= 0)
+        return c;
+    else
+        return ret;
+}
+
+int pcf50606_write_multiple(int address, const unsigned char* buf, int count)
+{
+    return i2c_write_data(0x10, address, buf, count);
+}
+
+int pcf50606_write(int address, unsigned char val)
+{
+    return pcf50606_write_multiple(address, &val, 1);
+}
+
+/* These voltages were determined by measuring the output of the PCF50606
+   on a running X5, and verified by disassembling the original firmware */
+static void set_voltages(void)
+{
+    static const unsigned char buf[5] =
+        {
+            0xf4,   /* IOREGC = 2.9V, ON in all states */
+            0xf0,   /* D1REGC = 2.5V, ON in all states */
+            0xf6,   /* D2REGC = 3.1V, ON in all states */
+            0xf4,   /* D3REGC = 2.9V, ON in all states */
+        };
+
+    pcf50606_write_multiple(0x23, buf, 4);
+}
+
+void pcf50606_init(void)
+{
+    /* Bit banged I2C */
+    or_l(0x00001000, &GPIO1_OUT);
+    or_l(0x00000400, &GPIO_OUT);
+    or_l(0x00001000, &GPIO1_ENABLE);
+    or_l(0x00000400, &GPIO_ENABLE);
+    or_l(0x00001000, &GPIO1_FUNCTION);
+    or_l(0x00000400, &GPIO_FUNCTION);
+
+    i2c_add_node(&pcf50606_i2c);
+
+    set_voltages();
+
+    pcf50606_write(0x35, 0xf1); /* Backlight PWM = 7kHz 8/16 */
+    pcf50606_write(0x38, 0x30); /* Backlight ON */
+}