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/* Copyright 2014-2016 IBM Corp.
* Copyright 2018 Raptor Engineering, LLC
*
* 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
* imitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <byteswap.h>
#include <stdint.h>
#include <stdbool.h>
#include <getopt.h>
#include <limits.h>
#include <arpa/inet.h>
#include <assert.h>
#include <endian.h>
#include <byteswap.h>
#define SYSFS_PREFIX "/sys/kernel/debug/powerpc/lpc"
int fd;
enum {
BMC_SIO_DEV_NONE = -1,
BMC_SIO_DEV_UART1 = 2,
BMC_SIO_DEV_UART2 = 3,
BMC_SIO_DEV_SWC = 4,
BMC_SIO_DEV_KBC = 5,
BMC_SIO_DEV_P80 = 7,
BMC_SIO_DEV_UART3 = 0xb,
BMC_SIO_DEV_UART4 = 0xc,
BMC_SIO_DEV_LPC2AHB = 0xd,
BMC_SIO_DEV_MBOX = 0xe,
};
static int bmc_sio_cur_dev = BMC_SIO_DEV_NONE;
void lpc_outb(uint8_t val, uint32_t addr)
{
ssize_t rc;
lseek(fd, addr, SEEK_SET);
val &= 0xff;
rc = write(fd, &val, 1);
if (rc != 1) {
perror("Failed to write to LPC");
exit(1);
}
}
static uint8_t lpc_inb(uint32_t addr)
{
uint8_t val;
ssize_t rc;
rc = read(fd, &val, 1);
if (rc != 1) {
perror("Failed to read from LPC");
exit(1);
}
return val;
}
/*
* SuperIO indirect accesses
*/
static void bmc_sio_outb(uint8_t val, uint8_t reg)
{
lpc_outb(reg, 0x2e);
lpc_outb(val, 0x2f);
}
static uint8_t bmc_sio_inb(uint8_t reg)
{
lpc_outb(reg, 0x2e);
return lpc_inb(0x2f);
}
static void bmc_sio_get(int dev)
{
if (bmc_sio_cur_dev == dev || dev < 0)
return;
if (bmc_sio_cur_dev == BMC_SIO_DEV_NONE) {
/* Send SuperIO password */
lpc_outb(0xa5, 0x2e);
lpc_outb(0xa5, 0x2e);
}
/* Select logical dev */
bmc_sio_outb(dev, 0x07);
bmc_sio_cur_dev = dev;
}
static void bmc_sio_put(bool lock_sio)
{
if (lock_sio) {
/* Re-lock SuperIO */
lpc_outb(0xaa, 0x2e);
bmc_sio_cur_dev = BMC_SIO_DEV_NONE;
}
}
/*
* AHB accesses via iLPC->AHB in SuperIO. Works on byteswapped
* values (ie. Little Endian registers)
*/
static void bmc_sio_ahb_prep(uint32_t reg, uint8_t type)
{
/* Enable iLPC->AHB */
bmc_sio_outb(0x01, 0x30);
/* Address */
bmc_sio_outb((reg >> 24) & 0xff, 0xf0);
bmc_sio_outb((reg >> 16) & 0xff, 0xf1);
bmc_sio_outb((reg >> 8) & 0xff, 0xf2);
bmc_sio_outb((reg ) & 0xff, 0xf3);
/* bytes cycle type */
bmc_sio_outb(type, 0xf8);
}
static void bmc_sio_ahb_writel(uint32_t val, uint32_t reg)
{
bmc_sio_get(BMC_SIO_DEV_LPC2AHB);
bmc_sio_ahb_prep(reg, 2);
/* Write data */
bmc_sio_outb(val >> 24, 0xf4);
bmc_sio_outb(val >> 16, 0xf5);
bmc_sio_outb(val >> 8, 0xf6);
bmc_sio_outb(val , 0xf7);
/* Trigger */
bmc_sio_outb(0xcf, 0xfe);
bmc_sio_put(false);
}
static uint32_t bmc_sio_ahb_readl(uint32_t reg)
{
uint32_t val = 0;
bmc_sio_get(BMC_SIO_DEV_LPC2AHB);
bmc_sio_ahb_prep(reg, 2);
/* Trigger */
bmc_sio_inb(0xfe);
/* Read results */
val = (val << 8) | bmc_sio_inb(0xf4);
val = (val << 8) | bmc_sio_inb(0xf5);
val = (val << 8) | bmc_sio_inb(0xf6);
val = (val << 8) | bmc_sio_inb(0xf7);
bmc_sio_put(false);
return val;
}
int main(int argc, char *argv[])
{
char path[256];
char *eq;
int size = 4;
bool do_write = false;
bool big_endian = false;
uint32_t addr, val;
ssize_t rc;
if (argc < 3) {
printf("Usage: %s <space> <addr>[=value]\n", argv[0]);
return 0;
}
eq = strchr(argv[2], '=');
if (eq) {
do_write = true;
val = strtoul(eq + 1, NULL, 0);
*eq = 0;
}
addr = strtoul(argv[2], NULL, 0);
memset(path, 0, sizeof(path));
snprintf(path, 255, SYSFS_PREFIX "/%s", argv[1]);
fd = open(path, O_RDWR);
if (fd < 0) {
perror("Failed to open sysfs file");
exit(1);
}
lseek(fd, addr, SEEK_SET);
if (do_write) {
bmc_sio_ahb_writel(val, addr);
} else {
val = bmc_sio_ahb_readl(addr);
printf("0x%08x\n", val);
}
return 0;
}
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