From 465596b1639393ef320decced442537133ab09e8 Mon Sep 17 00:00:00 2001
From: Dave Chapman <dave@dchapman.com>
Date: Sun, 5 Feb 2006 17:16:34 +0000
Subject: More iPod 3G code from Seven Le Mesle

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8582 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/drivers/i2c-pp5002.c | 168 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 168 insertions(+)
 create mode 100644 firmware/drivers/i2c-pp5002.c

(limited to 'firmware/drivers/i2c-pp5002.c')

diff --git a/firmware/drivers/i2c-pp5002.c b/firmware/drivers/i2c-pp5002.c
new file mode 100644
index 0000000000..dc26d8a5d9
--- /dev/null
+++ b/firmware/drivers/i2c-pp5002.c
@@ -0,0 +1,168 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * PP5002 I2C driver
+ *
+ * Based on code from the ipodlinux project - http://ipodlinux.org/
+ * Adapted for Rockbox in January 2006
+ *
+ * Original file: linux/arch/armnommu/mach-ipod/hardware.c
+ *
+ * Copyright (c) 2003-2005 Bernard Leach (leachbj@bouncycastle.org)
+ *
+ * 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 "cpu.h"
+#include "kernel.h"
+#include "logf.h"
+#include "system.h"
+#include "i2c-pp5002.h"
+
+/* Local functions definitions */
+
+#define IPOD_I2C_BASE   0xc0008000
+#define IPOD_I2C_CTRL   (IPOD_I2C_BASE+0x00)
+#define IPOD_I2C_ADDR   (IPOD_I2C_BASE+0x04)
+#define IPOD_I2C_DATA0  (IPOD_I2C_BASE+0x0c)
+#define IPOD_I2C_DATA1  (IPOD_I2C_BASE+0x10)
+#define IPOD_I2C_DATA2  (IPOD_I2C_BASE+0x14)
+#define IPOD_I2C_DATA3  (IPOD_I2C_BASE+0x18)
+#define IPOD_I2C_STATUS (IPOD_I2C_BASE+0x1c)
+
+/* IPOD_I2C_CTRL bit definitions */
+#define IPOD_I2C_SEND   0x80
+
+/* IPOD_I2C_STATUS bit definitions */
+#define IPOD_I2C_BUSY   (1<<6)
+
+#define POLL_TIMEOUT (HZ)
+
+static int ipod_i2c_wait_not_busy(void)
+{
+    unsigned long timeout;
+    timeout = current_tick + POLL_TIMEOUT;
+    while (TIME_BEFORE(current_tick, timeout)) {
+         if (!(inb(IPOD_I2C_STATUS) & IPOD_I2C_BUSY)) {
+            return 0;
+         }
+         yield();
+    }
+
+    return -1;
+}
+
+
+/* Public functions */
+
+int ipod_i2c_read_byte(unsigned int addr, unsigned int *data)
+{
+    if (ipod_i2c_wait_not_busy() < 0)
+    {
+        return -1;
+    }
+
+    /* clear top 15 bits, left shift 1, or in 0x1 for a read */
+    outb(((addr << 17) >> 16) | 0x1, IPOD_I2C_ADDR);
+
+    outb(inb(IPOD_I2C_CTRL) | 0x20, IPOD_I2C_CTRL);
+
+    outb(inb(IPOD_I2C_CTRL) | IPOD_I2C_SEND, IPOD_I2C_CTRL);
+
+    if (ipod_i2c_wait_not_busy() < 0)
+    {
+        return -1;
+    }
+
+    if (data)
+    {
+        *data = inb(IPOD_I2C_DATA0);
+    }
+
+    return 0;
+}
+
+int ipod_i2c_send_bytes(unsigned int addr, unsigned int len, unsigned char *data)
+{
+    int data_addr;
+    unsigned int i;
+
+    if (len < 1 || len > 4)
+    {
+        return -1;
+    }
+
+    if (ipod_i2c_wait_not_busy() < 0)
+    {
+        return -2;
+    }
+
+    /* clear top 15 bits, left shift 1 */
+    outb((addr << 17) >> 16, IPOD_I2C_ADDR);
+
+    outb(inb(IPOD_I2C_CTRL) & ~0x20, IPOD_I2C_CTRL);
+
+    data_addr = IPOD_I2C_DATA0;
+    for ( i = 0; i < len; i++ )
+    {
+        outb(*data++, data_addr);
+        data_addr += 4;
+    }
+
+    outb((inb(IPOD_I2C_CTRL) & ~0x26) | ((len-1) << 1), IPOD_I2C_CTRL);
+
+    outb(inb(IPOD_I2C_CTRL) | IPOD_I2C_SEND, IPOD_I2C_CTRL);
+
+    return 0x0;
+}
+
+int ipod_i2c_send_byte(unsigned int addr, int data0)
+{
+    unsigned char data[1];
+
+    data[0] = data0;
+
+    return ipod_i2c_send_bytes(addr, 1, data);
+}
+
+
+int i2c_readbyte(unsigned int dev_addr, int addr)
+{
+    int data;
+
+    ipod_i2c_send_byte(dev_addr, addr);
+    ipod_i2c_read_byte(dev_addr, &data);
+
+    return data;
+}
+
+int ipod_i2c_send(unsigned int addr, int data0, int data1)
+{
+    unsigned char data[2];
+
+    data[0] = data0;
+    data[1] = data1;
+
+    return ipod_i2c_send_bytes(addr, 2, data);
+}
+
+void i2c_init(void)
+{
+   /* From ipodlinux */
+
+   outl(inl(0xcf005000) | 0x2, 0xcf005000);
+	
+   outl(inl(0xcf005030) | (1<<8), 0xcf005030);
+   outl(inl(0xcf005030) & ~(1<<8), 0xcf005030);
+}
-- 
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