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[PATCH] I2C: Add PXA I2C driver

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Add support for the I2C PXA driver.

Signed-off-by: Russell King <rmk@arm.linux.org.uk>
This commit is contained in:
Russell King 2005-06-15 12:38:14 +01:00
parent c0105338eb
commit b652b438fc
6 changed files with 1167 additions and 0 deletions
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16
drivers/i2c/busses/Kconfig
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@ -144,6 +144,22 @@ config I2C_I810
This driver can also be built as a module. If so, the module
will be called i2c-i810.
config I2C_PXA
tristate "Intel PXA2XX I2C adapter (EXPERIMENTAL)"
depends on I2C && EXPERIMENTAL && ARCH_PXA
help
If you have devices in the PXA I2C bus, say yes to this option.
This driver can also be built as a module. If so, the module
will be called i2c-pxa.
config I2C_PXA_SLAVE
bool "Intel PXA2XX I2C Slave comms support"
depends on I2C_PXA
help
Support I2C slave mode communications on the PXA I2C bus. This
is necessary for systems where the PXA may be a target on the
I2C bus.
config I2C_PIIX4
tristate "Intel PIIX4"
depends on I2C && PCI

1
drivers/i2c/busses/Makefile
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@ -28,6 +28,7 @@ obj-$(CONFIG_I2C_PARPORT_LIGHT) += i2c-parport-light.o
obj-$(CONFIG_I2C_PCA_ISA) += i2c-pca-isa.o
obj-$(CONFIG_I2C_PIIX4) += i2c-piix4.o
obj-$(CONFIG_I2C_PROSAVAGE) += i2c-prosavage.o
obj-$(CONFIG_I2C_PXA) += i2c-pxa.o
obj-$(CONFIG_I2C_RPXLITE) += i2c-rpx.o
obj-$(CONFIG_I2C_S3C2410) += i2c-s3c2410.o
obj-$(CONFIG_I2C_SAVAGE4) += i2c-savage4.o

1031
drivers/i2c/busses/i2c-pxa.c Normal file
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File diff suppressed because it is too large Load Diff

70
include/asm-arm/arch-pxa/i2c.h Normal file
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@ -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

1
include/linux/i2c-id.h
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@ -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 */

48
include/linux/i2c-pxa.h Normal file
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@ -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 */