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/*
* Mailbox Daemon LPC Helpers
*
* Copyright 2016 IBM
*
* 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.
*
*/
#define _GNU_SOURCE
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <limits.h>
#include <poll.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/timerfd.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include <inttypes.h>
#include "mbox.h"
#include "common.h"
#include "mboxd_lpc.h"
#include "mboxd_flash.h"
#include <linux/aspeed-lpc-ctrl.h>
#define LPC_CTRL_PATH "/dev/aspeed-lpc-ctrl"
int init_lpc_dev(struct mbox_context *context)
{
struct aspeed_lpc_ctrl_mapping map = {
.window_type = ASPEED_LPC_CTRL_WINDOW_MEMORY,
.window_id = 0, /* There's only one */
.flags = 0,
.addr = 0,
.offset = 0,
.size = 0
};
int fd;
/* Open LPC Device */
MSG_OUT("Opening %s\n", LPC_CTRL_PATH);
fd = open(LPC_CTRL_PATH, O_RDWR | O_SYNC);
if (fd < 0) {
MSG_ERR("Couldn't open %s with flags O_RDWR: %s\n",
LPC_CTRL_PATH, strerror(errno));
return -errno;
}
context->fds[LPC_CTRL_FD].fd = fd;
/* Find Size of Reserved Memory Region */
MSG_OUT("Getting buffer size...\n");
if (ioctl(fd, ASPEED_LPC_CTRL_IOCTL_GET_SIZE, &map) < 0) {
MSG_ERR("Couldn't get lpc control buffer size: %s\n",
strerror(errno));
return -errno;
}
context->mem_size = map.size;
/* Map at the top of the 28-bit LPC firmware address space-0 */
context->lpc_base = 0x0FFFFFFF & -context->mem_size;
/* mmap the Reserved Memory Region */
MSG_OUT("Mapping %s for %u\n", LPC_CTRL_PATH, context->mem_size);
context->mem = mmap(NULL, context->mem_size, PROT_READ | PROT_WRITE,
MAP_SHARED, fd, 0);
if (context->mem == MAP_FAILED) {
MSG_ERR("Didn't manage to mmap %s: %s\n", LPC_CTRL_PATH,
strerror(errno));
return -errno;
}
return 0;
}
void free_lpc_dev(struct mbox_context *context)
{
if (context->mem) {
munmap(context->mem, context->mem_size);
}
close(context->fds[LPC_CTRL_FD].fd);
}
/*
* point_to_flash() - Point the lpc bus mapping to the actual flash device
* @context: The mbox context pointer
*
* Return: 0 on success otherwise negative error code
*/
int point_to_flash(struct mbox_context *context)
{
struct aspeed_lpc_ctrl_mapping map = {
.window_type = ASPEED_LPC_CTRL_WINDOW_FLASH,
.window_id = 0, /* Theres only one */
.flags = 0,
/*
* The mask is because the top nibble is the host LPC FW space,
* we want space 0.
*/
.addr = 0x0FFFFFFF & -context->flash_size,
.offset = 0,
.size = context->flash_size
};
if (context->state & MAPS_FLASH) {
return 0; /* LPC Bus already points to flash */
}
/* Don't let the host access flash while we're suspended */
if (context->state & STATE_SUSPENDED) {
MSG_ERR("Can't point lpc mapping to flash while suspended\n");
return -MBOX_R_PARAM_ERROR;
}
MSG_OUT("Pointing HOST LPC bus at the actual flash\n");
MSG_OUT("Assuming %dMB of flash: HOST LPC 0x%08x\n",
context->flash_size >> 20, map.addr);
if (ioctl(context->fds[LPC_CTRL_FD].fd, ASPEED_LPC_CTRL_IOCTL_MAP, &map)
== -1) {
MSG_ERR("Failed to point the LPC BUS at the actual flash: %s\n",
strerror(errno));
return -MBOX_R_SYSTEM_ERROR;
}
context->state = ACTIVE_MAPS_FLASH;
/*
* Since the host now has access to the flash it can change it out from
* under us
*/
return set_flash_bytemap(context, 0, context->flash_size, FLASH_DIRTY);
}
/*
* point_to_memory() - Point the lpc bus mapping to the reserved memory region
* @context: The mbox context pointer
*
* Return: 0 on success otherwise negative error code
*/
int point_to_memory(struct mbox_context *context)
{
struct aspeed_lpc_ctrl_mapping map = {
.window_type = ASPEED_LPC_CTRL_WINDOW_MEMORY,
.window_id = 0, /* There's only one */
.flags = 0,
.addr = context->lpc_base,
.offset = 0,
.size = context->mem_size
};
if (context->state & MAPS_MEM) {
return 0; /* LPC Bus already points to reserved memory area */
}
MSG_OUT("Pointing HOST LPC bus at memory region %p of size 0x%.8x\n",
context->mem, context->mem_size);
MSG_OUT("LPC address 0x%.8x\n", map.addr);
if (ioctl(context->fds[LPC_CTRL_FD].fd, ASPEED_LPC_CTRL_IOCTL_MAP,
&map)) {
MSG_ERR("Failed to point the LPC BUS to memory: %s\n",
strerror(errno));
return -MBOX_R_SYSTEM_ERROR;
}
/* LPC now maps memory (keep suspended state) */
context->state = MAPS_MEM | (context->state & STATE_SUSPENDED);
return 0;
}
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