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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.
*/
#include <skiboot.h>
#include <i2c.h>
#include <opal.h>
#include <device.h>
#include <opal-msg.h>
static LIST_HEAD(i2c_bus_list);
/* Used to assign OPAL IDs */
static uint32_t i2c_next_bus;
void i2c_add_bus(struct i2c_bus *bus)
{
bus->opal_id = ++i2c_next_bus;
dt_add_property_cells(bus->dt_node, "ibm,opal-id", bus->opal_id);
list_add_tail(&i2c_bus_list, &bus->link);
}
struct i2c_bus *i2c_find_bus_by_id(uint32_t opal_id)
{
struct i2c_bus *bus;
list_for_each(&i2c_bus_list, bus, link) {
if (bus->opal_id == opal_id)
return bus;
}
return NULL;
}
static void opal_i2c_request_complete(int rc, struct i2c_request *req)
{
uint64_t token = (uint64_t)(unsigned long)req->user_data;
opal_queue_msg(OPAL_MSG_ASYNC_COMP, NULL, NULL, token, rc);
i2c_free_req(req);
}
static int opal_i2c_request(uint64_t async_token, uint32_t bus_id,
struct opal_i2c_request *oreq)
{
struct i2c_bus *bus = NULL;
struct i2c_request *req;
int rc;
if (oreq->flags & OPAL_I2C_ADDR_10)
return OPAL_UNSUPPORTED;
bus = i2c_find_bus_by_id(bus_id);
if (!bus) {
/**
* @fwts-label I2CInvalidBusID
* @fwts-advice opal_i2c_request was passed an invalid bus
* ID. This has likely come from the OS rather than OPAL
* and thus could indicate an OS bug rather than an OPAL
* bug.
*/
prlog(PR_ERR, "I2C: Invalid 'bus_id' passed to the OPAL\n");
return OPAL_PARAMETER;
}
req = i2c_alloc_req(bus);
if (!req) {
/**
* @fwts-label I2CFailedAllocation
* @fwts-advice OPAL failed to allocate memory for an
* i2c_request. This points to an OPAL bug as OPAL ran
* out of memory and this should never happen.
*/
prlog(PR_ERR, "I2C: Failed to allocate 'i2c_request'\n");
return OPAL_NO_MEM;
}
switch(oreq->type) {
case OPAL_I2C_RAW_READ:
req->op = I2C_READ;
break;
case OPAL_I2C_RAW_WRITE:
req->op = I2C_WRITE;
break;
case OPAL_I2C_SM_READ:
req->op = SMBUS_READ;
req->offset = oreq->subaddr;
req->offset_bytes = oreq->subaddr_sz;
break;
case OPAL_I2C_SM_WRITE:
req->op = SMBUS_WRITE;
req->offset = oreq->subaddr;
req->offset_bytes = oreq->subaddr_sz;
break;
default:
bus->free_req(req);
return OPAL_PARAMETER;
}
req->dev_addr = oreq->addr;
req->rw_len = oreq->size;
req->rw_buf = (void *)oreq->buffer_ra;
req->completion = opal_i2c_request_complete;
req->user_data = (void *)(unsigned long)async_token;
req->bus = bus;
/* Finally, queue the OPAL i2c request and return */
rc = i2c_queue_req(req);
if (rc) {
i2c_free_req(req);
return rc;
}
return OPAL_ASYNC_COMPLETION;
}
opal_call(OPAL_I2C_REQUEST, opal_i2c_request, 3);
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