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/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <stdint.h>
#include <stdio.h>
#include <sys/io.h>
#include <sys/param.h>
#include <unistd.h>
#include "comm-host.h"
#include "ec_commands.h"
#define INITIAL_UDELAY 5 /* 5 us */
#define MAXIMUM_UDELAY 10000 /* 10 ms */
int comm_init(void)
{
int i;
int byte = 0xff;
/* Request I/O privilege */
if (iopl(3) < 0) {
perror("Error getting I/O privilege");
return -3;
}
/*
* Test if the I/O port has been configured for Chromium EC LPC
* interface. If all the bytes are 0xff, very likely that Chromium EC
* is not present.
*
* TODO: (crosbug.com/p/10963) Should only need to look at the command
* byte, since we don't support ACPI burst mode and thus bit 4 should
* be 0.
*/
byte &= inb(EC_LPC_ADDR_USER_CMD);
byte &= inb(EC_LPC_ADDR_USER_DATA);
for (i = 0; i < EC_PARAM_SIZE && byte == 0xff; ++i)
byte &= inb(EC_LPC_ADDR_USER_PARAM + i);
if (byte == 0xff) {
fprintf(stderr, "Port 0x%x,0x%x,0x%x-0x%x are all 0xFF.\n",
EC_LPC_ADDR_USER_CMD, EC_LPC_ADDR_USER_DATA,
EC_LPC_ADDR_USER_PARAM,
EC_LPC_ADDR_USER_PARAM + EC_PARAM_SIZE - 1);
fprintf(stderr,
"Very likely this board doesn't have a Chromium EC.\n");
return -4;
}
return 0;
}
/*
* Wait for the EC to be unbusy. Returns 0 if unbusy, non-zero if
* timeout.
*/
static int wait_for_ec(int status_addr, int timeout_usec)
{
int i;
int delay = INITIAL_UDELAY;
for (i = 0; i < timeout_usec; i += delay) {
/*
* Delay first, in case we just sent out a command but the EC
* hasn't raise the busy flag. However, I think this doesn't
* happen since the LPC commands are executed in order and the
* busy flag is set by hardware.
*
* TODO: move this delay after inb(status).
*/
usleep(MIN(delay, timeout_usec - i));
if (!(inb(status_addr) & EC_LPC_STATUS_BUSY_MASK))
return 0;
/* Increase the delay interval after a few rapid checks */
if (i > 20)
delay = MIN(delay * 2, MAXIMUM_UDELAY);
}
return -1; /* Timeout */
}
int ec_command(int command, const void *indata, int insize,
void *outdata, int outsize) {
uint8_t *d;
int i;
/* TODO: add command line option to use kernel command/param window */
int cmd_addr = EC_LPC_ADDR_USER_CMD;
int data_addr = EC_LPC_ADDR_USER_DATA;
int param_addr = EC_LPC_ADDR_USER_PARAM;
if (insize > EC_PARAM_SIZE || outsize > EC_PARAM_SIZE) {
fprintf(stderr, "Data size too big\n");
return -EC_RES_ERROR;
}
if (wait_for_ec(cmd_addr, 1000000)) {
fprintf(stderr, "Timeout waiting for EC ready\n");
return -EC_RES_ERROR;
}
/* Write data, if any */
/* TODO: optimized copy using outl() */
for (i = 0, d = (uint8_t *)indata; i < insize; i++, d++)
outb(*d, param_addr + i);
outb(command, cmd_addr);
if (wait_for_ec(cmd_addr, 1000000)) {
fprintf(stderr, "Timeout waiting for EC response\n");
return -EC_RES_ERROR;
}
/* Check result */
i = inb(data_addr);
if (i) {
fprintf(stderr, "EC returned error result code %d\n", i);
return -i;
}
/* Read data, if any */
/* TODO: optimized copy using outl() */
for (i = 0, d = (uint8_t *)outdata; i < outsize; i++, d++)
*d = inb(param_addr + i);
/*
* LPC protocol doesn't have a way to communicate the true output
* size, so assume we got everything we asked for.
*/
return outsize;
}
uint8_t read_mapped_mem8(uint8_t offset)
{
return inb(EC_LPC_ADDR_MEMMAP + offset);
}
uint16_t read_mapped_mem16(uint8_t offset)
{
return inw(EC_LPC_ADDR_MEMMAP + offset);
}
uint32_t read_mapped_mem32(uint8_t offset)
{
return inl(EC_LPC_ADDR_MEMMAP + offset);
}
int read_mapped_string(uint8_t offset, char *buf)
{
int c;
for (c = 0; c < EC_MEMMAP_TEXT_MAX; c++) {
buf[c] = inb(EC_LPC_ADDR_MEMMAP + offset + c);
if (buf[c] == 0)
return c;
}
buf[EC_MEMMAP_TEXT_MAX-1] = 0;
return EC_MEMMAP_TEXT_MAX;
}
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