[PATCH] I2C: Add PXA I2C driver
Add support for the I2C PXA driver.
Signed-off-by: Russell King <[email protected]>
diff --git a/include/asm-arm/arch-pxa/i2c.h b/include/asm-arm/arch-pxa/i2c.h
new file mode 100644
index 0000000..46ec224
--- /dev/null
+++ b/include/asm-arm/arch-pxa/i2c.h
@@ -0,0 +1,70 @@
+/*
+ * i2c_pxa.h
+ *
+ * Copyright (C) 2002 Intrinsyc Software Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+#ifndef _I2C_PXA_H_
+#define _I2C_PXA_H_
+
+#if 0
+#define DEF_TIMEOUT 3
+#else
+/* need a longer timeout if we're dealing with the fact we may well be
+ * looking at a multi-master environment
+*/
+#define DEF_TIMEOUT 32
+#endif
+
+#define BUS_ERROR (-EREMOTEIO)
+#define XFER_NAKED (-ECONNREFUSED)
+#define I2C_RETRY (-2000) /* an error has occurred retry transmit */
+
+/* ICR initialize bit values
+*
+* 15. FM 0 (100 Khz operation)
+* 14. UR 0 (No unit reset)
+* 13. SADIE 0 (Disables the unit from interrupting on slave addresses
+* matching its slave address)
+* 12. ALDIE 0 (Disables the unit from interrupt when it loses arbitration
+* in master mode)
+* 11. SSDIE 0 (Disables interrupts from a slave stop detected, in slave mode)
+* 10. BEIE 1 (Enable interrupts from detected bus errors, no ACK sent)
+* 9. IRFIE 1 (Enable interrupts from full buffer received)
+* 8. ITEIE 1 (Enables the I2C unit to interrupt when transmit buffer empty)
+* 7. GCD 1 (Disables i2c unit response to general call messages as a slave)
+* 6. IUE 0 (Disable unit until we change settings)
+* 5. SCLE 1 (Enables the i2c clock output for master mode (drives SCL)
+* 4. MA 0 (Only send stop with the ICR stop bit)
+* 3. TB 0 (We are not transmitting a byte initially)
+* 2. ACKNAK 0 (Send an ACK after the unit receives a byte)
+* 1. STOP 0 (Do not send a STOP)
+* 0. START 0 (Do not send a START)
+*
+*/
+#define I2C_ICR_INIT (ICR_BEIE | ICR_IRFIE | ICR_ITEIE | ICR_GCD | ICR_SCLE)
+
+/* I2C status register init values
+ *
+ * 10. BED 1 (Clear bus error detected)
+ * 9. SAD 1 (Clear slave address detected)
+ * 7. IRF 1 (Clear IDBR Receive Full)
+ * 6. ITE 1 (Clear IDBR Transmit Empty)
+ * 5. ALD 1 (Clear Arbitration Loss Detected)
+ * 4. SSD 1 (Clear Slave Stop Detected)
+ */
+#define I2C_ISR_INIT 0x7FF /* status register init */
+
+struct i2c_slave_client;
+
+struct i2c_pxa_platform_data {
+ unsigned int slave_addr;
+ struct i2c_slave_client *slave;
+};
+
+extern void pxa_set_i2c_info(struct i2c_pxa_platform_data *info);
+#endif
diff --git a/include/linux/i2c-id.h b/include/linux/i2c-id.h
index 89270ce..74d6dc9 100644
--- a/include/linux/i2c-id.h
+++ b/include/linux/i2c-id.h
@@ -203,6 +203,7 @@
#define I2C_ALGO_MV64XXX 0x190000 /* Marvell mv64xxx i2c ctlr */
#define I2C_ALGO_PCA 0x1a0000 /* PCA 9564 style adapters */
#define I2C_ALGO_AU1550 0x1b0000 /* Au1550 PSC algorithm */
+#define I2C_ALGO_PXA 0x1c0000 /* Intel PXA I2C algorithm */
#define I2C_ALGO_EXP 0x800000 /* experimental */
diff --git a/include/linux/i2c-pxa.h b/include/linux/i2c-pxa.h
new file mode 100644
index 0000000..5f3eaf8
--- /dev/null
+++ b/include/linux/i2c-pxa.h
@@ -0,0 +1,48 @@
+#ifndef _LINUX_I2C_ALGO_PXA_H
+#define _LINUX_I2C_ALGO_PXA_H
+
+struct i2c_eeprom_emu_watcher {
+ void (*write)(void *, unsigned int addr, unsigned char newval);
+};
+
+struct i2c_eeprom_emu_watch {
+ struct list_head node;
+ unsigned int start;
+ unsigned int end;
+ struct i2c_eeprom_emu_watcher *ops;
+ void *data;
+};
+
+#define I2C_EEPROM_EMU_SIZE (256)
+
+struct i2c_eeprom_emu {
+ unsigned int size;
+ unsigned int ptr;
+ unsigned int seen_start;
+ struct list_head watch;
+
+ unsigned char bytes[I2C_EEPROM_EMU_SIZE];
+};
+
+typedef enum i2c_slave_event_e {
+ I2C_SLAVE_EVENT_START_READ,
+ I2C_SLAVE_EVENT_START_WRITE,
+ I2C_SLAVE_EVENT_STOP
+} i2c_slave_event_t;
+
+struct i2c_slave_client {
+ void *data;
+ void (*event)(void *ptr, i2c_slave_event_t event);
+ int (*read) (void *ptr);
+ void (*write)(void *ptr, unsigned int val);
+};
+
+extern int i2c_eeprom_emu_addwatcher(struct i2c_eeprom_emu *, void *data,
+ unsigned int addr, unsigned int size,
+ struct i2c_eeprom_emu_watcher *);
+
+extern void i2c_eeprom_emu_delwatcher(struct i2c_eeprom_emu *, void *data, struct i2c_eeprom_emu_watcher *watcher);
+
+extern struct i2c_eeprom_emu *i2c_pxa_get_eeprom(void);
+
+#endif /* _LINUX_I2C_ALGO_PXA_H */
