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authorLinus Nielsen Feltzing <linus@haxx.se>2006-02-23 15:24:45 +0000
committerLinus Nielsen Feltzing <linus@haxx.se>2006-02-23 15:24:45 +0000
commit4feb0fca80c291c37c939e8445f846edd2b231bc (patch)
tree4a1cc04bc704e0bb7ff8d13129c628010138babc /firmware
parent072744b4f4cfaa8c0ceb8e18f43a92dad78da91a (diff)
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PCF50606 driver for iAudio X5
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8809 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware')
-rw-r--r--firmware/target/coldfire/iaudio/x5/pcf50606-x5.c171
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 */
+}