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-rw-r--r--firmware/target/arm/i2c-pp.c208
1 files changed, 208 insertions, 0 deletions
diff --git a/firmware/target/arm/i2c-pp.c b/firmware/target/arm/i2c-pp.c
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index 0000000000..0c8aec8f4b
--- /dev/null
+++ b/firmware/target/arm/i2c-pp.c
@@ -0,0 +1,208 @@
+/***************************************************************************
+ * __________ __ ___.
+ * Open \______ \ ____ ____ | | _\_ |__ _______ ___
+ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
+ * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
+ * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
+ * \/ \/ \/ \/ \/
+ * $Id$
+ *
+ * PP502X and PP5002 I2C driver
+ *
+ * Based on code from the ipodlinux project - http://ipodlinux.org/
+ * Adapted for Rockbox in November 2005
+ *
+ * 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"
+#if CONFIG_I2C == I2C_PP5002
+#include "i2c-pp5002.h"
+#else
+#include "i2c-pp5020.h"
+#endif
+
+/* Local functions definitions */
+
+#define POLL_TIMEOUT (HZ)
+
+static int pp_i2c_wait_not_busy(void)
+{
+ unsigned long timeout;
+ timeout = current_tick + POLL_TIMEOUT;
+ while (TIME_BEFORE(current_tick, timeout)) {
+ if (!(I2C_STATUS & I2C_BUSY)) {
+ return 0;
+ }
+ yield();
+ }
+
+ return -1;
+}
+
+static int pp_i2c_read_byte(unsigned int addr, unsigned int *data)
+{
+ if (pp_i2c_wait_not_busy() < 0)
+ {
+ return -1;
+ }
+
+ {
+ unsigned int byte;
+ int old_irq_level = set_irq_level(HIGHEST_IRQ_LEVEL);
+
+ /* clear top 15 bits, left shift 1, or in 0x1 for a read */
+ I2C_ADDR = ((addr << 17) >> 16) | 0x1 ;
+
+ I2C_CTRL |= 0x20;
+
+ I2C_CTRL |= I2C_SEND;
+
+ set_irq_level(old_irq_level);
+ if (pp_i2c_wait_not_busy() < 0)
+ {
+ return -1;
+ }
+ old_irq_level = set_irq_level(HIGHEST_IRQ_LEVEL);
+
+ byte = I2C_DATA(0);
+
+ if (data)
+ *data = byte;
+
+ set_irq_level(old_irq_level);
+ }
+
+ return 0;
+}
+
+static int pp_i2c_send_bytes(unsigned int addr, unsigned int len, unsigned char *data)
+{
+ unsigned int i;
+
+ if (len < 1 || len > 4)
+ {
+ return -1;
+ }
+
+ if (pp_i2c_wait_not_busy() < 0)
+ {
+ return -2;
+ }
+
+ {
+ int old_irq_level = set_irq_level(HIGHEST_IRQ_LEVEL);
+
+ /* clear top 15 bits, left shift 1 */
+ I2C_ADDR = (addr << 17) >> 16;
+
+ I2C_CTRL &= ~0x20;
+
+ for ( i = 0; i < len; i++ )
+ {
+ I2C_DATA(i) = *data++;
+ }
+
+ I2C_CTRL = (I2C_CTRL & ~0x26) | ((len-1) << 1);
+
+ I2C_CTRL |= I2C_SEND;
+
+ set_irq_level(old_irq_level);
+ }
+
+ return 0x0;
+}
+
+static int pp_i2c_send_byte(unsigned int addr, int data0)
+{
+ unsigned char data[1];
+
+ data[0] = data0;
+
+ return pp_i2c_send_bytes(addr, 1, data);
+}
+
+/* Public functions */
+static struct mutex i2c_mutex;
+
+int i2c_readbytes(unsigned int dev_addr, int addr, int len, unsigned char *data) {
+ unsigned int temp;
+ int i;
+ mutex_lock(&i2c_mutex);
+ pp_i2c_send_byte(dev_addr, addr);
+ for (i = 0; i < len; i++) {
+ pp_i2c_read_byte(dev_addr, &temp);
+ data[i] = temp;
+ }
+ mutex_unlock(&i2c_mutex);
+ return i;
+}
+
+int i2c_readbyte(unsigned int dev_addr, int addr)
+{
+ int data;
+
+ mutex_lock(&i2c_mutex);
+ pp_i2c_send_byte(dev_addr, addr);
+ pp_i2c_read_byte(dev_addr, &data);
+ mutex_unlock(&i2c_mutex);
+
+ return data;
+}
+
+int pp_i2c_send(unsigned int addr, int data0, int data1)
+{
+ int retval;
+ unsigned char data[2];
+
+ data[0] = data0;
+ data[1] = data1;
+
+ mutex_lock(&i2c_mutex);
+ retval = pp_i2c_send_bytes(addr, 2, data);
+ mutex_unlock(&i2c_mutex);
+
+ return retval;
+}
+
+void i2c_init(void)
+{
+ /* From ipodlinux */
+
+#ifdef IPOD_MINI
+ /* GPIO port C disable port 0x10 */
+ GPIOC_ENABLE &= ~0x10;
+
+ /* GPIO port C disable port 0x20 */
+ GPIOC_ENABLE &= ~0x20;
+#endif
+
+#if CONFIG_I2C == I2C_PP5002
+ DEV_EN |= 0x2;
+#else
+ DEV_EN |= DEV_I2C; /* Enable I2C */
+#endif
+ DEV_RS |= DEV_I2C; /* Start I2C Reset */
+ DEV_RS &=~DEV_I2C; /* End I2C Reset */
+
+#if CONFIG_I2C == I2C_PP5020
+ outl(0x0, 0x600060a4);
+ outl(0x80 | (0 << 8), 0x600060a4);
+#endif
+
+ mutex_init(&i2c_mutex);
+
+ i2c_readbyte(0x8, 0);
+}