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/* Copyright 2013-2014 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __I2C_H
#define __I2C_H
struct i2c_request;
struct i2c_bus {
struct list_node link;
struct dt_node *dt_node;
uint32_t opal_id;
int (*queue_req)(struct i2c_request *req);
struct i2c_request *(*alloc_req)(struct i2c_bus *bus);
void (*free_req)(struct i2c_request *req);
void (*set_req_timeout)(struct i2c_request *req,
uint64_t duration);
uint64_t (*run_req)(struct i2c_request *req);
int (*check_quirk)(void *data, struct i2c_request *req, int *rc);
void *check_quirk_data;
};
/*
* I2C specific OPAL error codes:
*
* OPAL_I2C_TIMEOUT I2C request timed out
* OPAL_I2C_INVALID_CMD New command given when old not completed yet
* OPAL_I2C_LBUS_PARITY Local bus parity error
* OPAL_I2C_BKEND_OVERRUN Writing/reading into full/empty fifo respectively
* OPAL_I2C_BKEND_ACCESS Writing/reading more data than requested
* OPAL_I2C_ARBT_LOST I2C bus is held by some other master
* OPAL_I2C_NACK_RCVD Slave is not responding back with the ACK
* OPAL_I2C_STOP_ERR Did not able to send the STOP condtion on bus
*/
struct i2c_request {
struct list_node link;
struct i2c_bus *bus;
enum i2c_operation {
I2C_READ, /* RAW read from the device without offset */
I2C_WRITE, /* RAW write to the device without offset */
SMBUS_READ, /* SMBUS protocol read from the device */
SMBUS_WRITE, /* SMBUS protocol write to the device */
} op;
int result; /* OPAL i2c error code */
uint32_t dev_addr; /* Slave device address */
uint32_t offset_bytes; /* Internal device offset */
uint32_t offset; /* Internal device offset */
uint32_t rw_len; /* Length of the data request */
void *rw_buf; /* Data request buffer */
void (*completion)( /* Completion callback */
int rc, struct i2c_request *req);
void *user_data; /* Client data */
int retries;
};
/* Generic i2c */
extern void i2c_add_bus(struct i2c_bus *bus);
extern struct i2c_bus *i2c_find_bus_by_id(uint32_t opal_id);
static inline struct i2c_request *i2c_alloc_req(struct i2c_bus *bus)
{
return bus->alloc_req(bus);
}
static inline void i2c_free_req(struct i2c_request *req)
{
req->bus->free_req(req);
}
static inline int i2c_queue_req(struct i2c_request *req)
{
return req->bus->queue_req(req);
}
static inline void i2c_set_req_timeout(struct i2c_request *req,
uint64_t duration)
{
if (req->bus->set_req_timeout)
req->bus->set_req_timeout(req, duration);
}
static inline uint64_t i2c_run_req(struct i2c_request *req)
{
if (req->bus->run_req)
return req->bus->run_req(req);
return 0;
}
static inline int i2c_check_quirk(struct i2c_request *req, int *rc)
{
if (req->bus->check_quirk)
return req->bus->check_quirk(req->bus->check_quirk_data, req, rc);
return 0;
}
/* I2C synchronous request API */
int i2c_request_send(int bus_id, int dev_addr, int read_write,
uint32_t offset, uint32_t offset_bytes, void* buf,
size_t buflen, int timeout);
/* P8 implementation details */
extern void p8_i2c_init(void);
extern void p8_i2c_interrupt(uint32_t chip_id);
/* P9 I2C Ownership Change OCC interrupt handler */
extern void p9_i2c_bus_owner_change(u32 chip_id);
#endif /* __I2C_H */
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