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/* Copyright 2016 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 <unistd.h>
#include "target.h"
#include "bitutils.h"
#include "operations.h"
#define FSI_DATA0_REG 0x1000
#define FSI_DATA1_REG 0x1001
#define FSI_CMD_REG 0x1002
#define FSI_CMD_REG_WRITE PPC_BIT32(0)
#define FSI_RESET_REG 0x1006
#define FSI_RESET_CMD PPC_BIT32(0)
#define FSI_SET_PIB_RESET_REG 0x1007
#define FSI_SET_PIB_RESET PPC_BIT32(0)
/* For some reason the FSI2PIB engine dies with frequent
* access. Letting it have a bit of a rest seems to stop the
* problem. This sets the number of usecs to sleep between SCOM
* accesses. */
#define FSI2PIB_RELAX 50
static int fsi2pib_getscom(struct target *target, uint64_t addr, uint64_t *value)
{
uint64_t result;
usleep(FSI2PIB_RELAX);
/* Get scom works by putting the address in FSI_CMD_REG and
* reading the result from FST_DATA[01]_REG. */
CHECK_ERR(write_next_target(target, FSI_CMD_REG, addr));
CHECK_ERR(read_next_target(target, FSI_DATA0_REG, &result));
*value = result << 32;
CHECK_ERR(read_next_target(target, FSI_DATA1_REG, &result));
*value |= result;
return 0;
}
static int fsi2pib_putscom(struct target *target, uint64_t addr, uint64_t value)
{
usleep(FSI2PIB_RELAX);
CHECK_ERR(write_next_target(target, FSI_RESET_REG, FSI_RESET_CMD));
CHECK_ERR(write_next_target(target, FSI_DATA0_REG, (value >> 32) & 0xffffffff));
CHECK_ERR(write_next_target(target, FSI_DATA1_REG, value & 0xffffffff));
CHECK_ERR(write_next_target(target, FSI_CMD_REG, FSI_CMD_REG_WRITE | addr));
return 0;
}
int fsi2pib_target_init(struct target *target, const char *name, uint64_t base, struct target *next)
{
target->name = name;
target->read = fsi2pib_getscom;
target->write = fsi2pib_putscom;
target->base = base;
target->next = next;
return -1;
}
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