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/*
* Copyright (C) 2018 Pengutronix, Uwe Kleine-König <oss-tools@pengutronix.de>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <linux/if.h>
#include <linux/mii.h>
#include <linux/sockios.h>
#include "fileaccpriv.h"
#define container_of(ptr, type, member) \
(type *)((char *)(ptr) - (char *) &((type *)0)->member)
struct memtool_mdio_fd {
struct memtool_fd mfd;
int fd;
uint16_t phy_id;
char ifrn_name[IFNAMSIZ];
};
static ssize_t mdio_read(struct memtool_fd *handle, off_t offset,
void *buf, size_t nbytes, int width)
{
struct memtool_mdio_fd *mdio_fd =
container_of(handle, struct memtool_mdio_fd, mfd);
struct ifreq ifr;
struct mii_ioctl_data *mii = (void *)&ifr.ifr_data;
size_t i = 0;
int ret;
if (width != 2) {
fprintf(stderr,
"mdio can only be accessed with memory width 2\n");
return -EINVAL;
}
assert((nbytes & 1) == 0);
memset(&ifr, 0, sizeof(ifr));
strcpy(ifr.ifr_name, mdio_fd->ifrn_name);
mii->phy_id = mdio_fd->phy_id;
while (2 * i < nbytes) {
mii->reg_num = offset / 2 + i;
ret = ioctl(mdio_fd->fd, SIOCGMIIREG, &ifr);
if (ret < 0) {
perror("Failure to read register");
return -1;
}
((uint16_t *)buf)[i] = mii->val_out;
++i;
}
return 2 * i;
}
static ssize_t mdio_write(struct memtool_fd *handle, off_t offset,
const void *buf, size_t nbytes, int width)
{
struct memtool_mdio_fd *mdio_fd =
container_of(handle, struct memtool_mdio_fd, mfd);
struct ifreq ifr;
struct mii_ioctl_data *mii = (void *)&ifr.ifr_data;
size_t i = 0;
int ret;
if (width != 2) {
fprintf(stderr,
"mdio can only be accessed with memory width 2\n");
return -EINVAL;
}
assert((nbytes & 1) == 0);
memset(&ifr, 0, sizeof(ifr));
strcpy(ifr.ifr_name, mdio_fd->ifrn_name);
mii->phy_id = mdio_fd->phy_id;
while (2 * i < nbytes) {
mii->reg_num = offset / 2 + i;
mii->val_in = ((uint16_t *)buf)[i];
ret = ioctl(mdio_fd->fd, SIOCSMIIREG, &ifr);
if (ret < 0) {
perror("Failure to write register");
return -1;
}
++i;
}
return 2 * i;
}
static int mdio_close(struct memtool_fd *handle)
{
struct memtool_mdio_fd *mdio_fd =
container_of(handle, struct memtool_mdio_fd, mfd);
int ret;
ret = close(mdio_fd->fd);
free(mdio_fd);
return ret;
}
struct memtool_fd *mdio_open(const char *spec, int flags)
{
struct memtool_mdio_fd *mdio_fd;
char *delim;
char *endp;
long int val;
mdio_fd = malloc(sizeof(*mdio_fd));
if (!mdio_fd) {
fprintf(stderr, "Failure to allocate mdio_fd\n");
return NULL;
}
mdio_fd->mfd.read = mdio_read;
mdio_fd->mfd.write = mdio_write;
mdio_fd->mfd.close = mdio_close;
mdio_fd->fd = socket(AF_INET, SOCK_DGRAM, 0);
if (mdio_fd->fd < 0) {
perror("socket");
goto err_socket;
}
delim = strrchr(spec, '.');
if (!delim) {
fprintf(stderr, "Failed to parse phy specifier, no \".\"\n");
goto err_parse;
}
if (delim - spec >= sizeof(mdio_fd->ifrn_name)) {
fprintf(stderr, "device string too long\n");
goto err_parse;
}
memcpy(mdio_fd->ifrn_name, spec, delim - spec);
mdio_fd->ifrn_name[delim - spec] = '\0';
val = strtol(delim + 1, &endp, 0);
if (*endp != '\0') {
fprintf(stderr, "failed to parse phy_id\n");
goto err_parse;
}
if (val < 0 || val >= (1 << 16)) {
fprintf(stderr, "phy_id out of range\n");
err_parse:
close(mdio_fd->fd);
err_socket:
free(mdio_fd);
return NULL;
}
mdio_fd->phy_id = val;
return &mdio_fd->mfd;
}
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