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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 <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <assert.h>
#include <errno.h>
#include <err.h>
#include <inttypes.h>
#include <endian.h>
#include "bitutils.h"
#include "operations.h"
#include "target.h"
#define FSI_SCAN_PATH "/sys/bus/platform/devices/gpio-fsi/fsi0/rescan"
#define FSI_CFAM_PATH "/sys/devices/platform/gpio-fsi/fsi0/slave@00:00/raw"
int fsi_fd;
static int kernel_fsi_getcfam(struct fsi *fsi, uint32_t addr64, uint32_t *value)
{
int rc;
uint32_t tmp, addr = (addr64 & 0x7ffc00) | ((addr64 & 0x3ff) << 2);
rc = lseek(fsi_fd, addr, SEEK_SET);
if (rc < 0) {
warn("Failed to seek %s", FSI_CFAM_PATH);
return errno;
}
rc = read(fsi_fd, &tmp, 4);
if (rc < 0) {
if ((addr64 & 0xfff) != 0xc09)
/* We expect reads of 0xc09 to occasionally
* fail as the probing code uses it to see
* if anything is present on the link. */
warn("Failed to read from 0x%08" PRIx32 " (%016" PRIx32 ")", (uint32_t) addr, addr64);
return errno;
}
*value = be32toh(tmp);
return 0;
}
static int kernel_fsi_putcfam(struct fsi *fsi, uint32_t addr64, uint32_t data)
{
int rc;
uint32_t tmp, addr = (addr64 & 0x7ffc00) | ((addr64 & 0x3ff) << 2);
rc = lseek(fsi_fd, addr, SEEK_SET);
if (rc < 0) {
warn("Failed to seek %s", FSI_CFAM_PATH);
return errno;
}
tmp = htobe32(data);
rc = write(fsi_fd, &tmp, 4);
if (rc < 0) {
warn("Failed to write to 0x%08" PRIx32 " (%016" PRIx32 ")", addr, addr64);
return errno;
}
return 0;
}
#if 0
/* TODO: At present we don't have a generic destroy method as there aren't many
* use cases for it. So for the moment we can just let the OS close the file
* descriptor on exit. */
static void kernel_fsi_destroy(struct target *target)
{
close(fsi_fd);
}
#endif
static void kernel_fsi_scan_devices(void)
{
const char one = '1';
int rc, fd;
fd = open(FSI_SCAN_PATH, O_WRONLY | O_SYNC);
if (fd < 0)
err(errno, "Unable to open %s", FSI_SCAN_PATH);
rc = write(fd, &one, sizeof(one));
if (rc < 0)
err(errno, "Unable to write to %s", FSI_SCAN_PATH);
close(fd);
}
int kernel_fsi_probe(struct target *target)
{
if (!fsi_fd) {
int tries = 5;
while (tries) {
/* Open first raw device */
fsi_fd = open(FSI_CFAM_PATH, O_RDWR | O_SYNC);
if (fsi_fd >= 0)
return 0;
tries--;
/* Scan */
kernel_fsi_scan_devices();
sleep(1);
}
if (fsi_fd < 0) {
err(errno, "Unable to open %s", FSI_CFAM_PATH);
return -1;
}
}
return -1;
}
struct fsi kernel_fsi = {
.target = {
.name = "Kernel based FSI master",
.compatible = "ibm,kernel-fsi",
.class = "fsi",
.probe = kernel_fsi_probe,
},
.read = kernel_fsi_getcfam,
.write = kernel_fsi_putcfam,
};
DECLARE_HW_UNIT(kernel_fsi);
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