mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-10 23:24:38 +00:00
cros: add LPC support for cros_ec
This patch adds LPC support for carrying out the cros_ec protocol. Signed-off-by: Randall Spangler <rspangler@chromium.org> Signed-off-by: Simon Glass <sjg@chromium.org> Signed-off-by: Hung-ying Tyan <tyanh@chromium.org> Acked-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
parent
f3424c554c
commit
c8d3328a0a
2 changed files with 284 additions and 0 deletions
|
@ -29,6 +29,7 @@ COBJS-$(CONFIG_ALI152X) += ali512x.o
|
|||
COBJS-$(CONFIG_DS4510) += ds4510.o
|
||||
COBJS-$(CONFIG_CBMEM_CONSOLE) += cbmem_console.o
|
||||
COBJS-$(CONFIG_CROS_EC) += cros_ec.o
|
||||
COBJS-$(CONFIG_CROS_EC_LPC) += cros_ec_lpc.o
|
||||
COBJS-$(CONFIG_CROS_EC_I2C) += cros_ec_i2c.o
|
||||
COBJS-$(CONFIG_CROS_EC_SPI) += cros_ec_spi.o
|
||||
COBJS-$(CONFIG_FSL_IIM) += fsl_iim.o
|
||||
|
|
283
drivers/misc/cros_ec_lpc.c
Normal file
283
drivers/misc/cros_ec_lpc.c
Normal file
|
@ -0,0 +1,283 @@
|
|||
/*
|
||||
* Chromium OS cros_ec driver - LPC interface
|
||||
*
|
||||
* Copyright (c) 2012 The Chromium OS Authors.
|
||||
* See file CREDITS for list of people who contributed to this
|
||||
* project.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License as
|
||||
* published by the Free Software Foundation; either version 2 of
|
||||
* the License, or (at your option) any later version.
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
||||
* MA 02111-1307 USA
|
||||
*/
|
||||
|
||||
/*
|
||||
* The Matrix Keyboard Protocol driver handles talking to the keyboard
|
||||
* controller chip. Mostly this is for keyboard functions, but some other
|
||||
* things have slipped in, so we provide generic services to talk to the
|
||||
* KBC.
|
||||
*/
|
||||
|
||||
#include <common.h>
|
||||
#include <command.h>
|
||||
#include <cros_ec.h>
|
||||
#include <asm/io.h>
|
||||
|
||||
#ifdef DEBUG_TRACE
|
||||
#define debug_trace(fmt, b...) debug(fmt, ##b)
|
||||
#else
|
||||
#define debug_trace(fmt, b...)
|
||||
#endif
|
||||
|
||||
static int wait_for_sync(struct cros_ec_dev *dev)
|
||||
{
|
||||
unsigned long start;
|
||||
|
||||
start = get_timer(0);
|
||||
while (inb(EC_LPC_ADDR_HOST_CMD) & EC_LPC_STATUS_BUSY_MASK) {
|
||||
if (get_timer(start) > 1000) {
|
||||
debug("%s: Timeout waiting for CROS_EC sync\n",
|
||||
__func__);
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Send a command to a LPC CROS_EC device and return the reply.
|
||||
*
|
||||
* The device's internal input/output buffers are used.
|
||||
*
|
||||
* @param dev CROS_EC device
|
||||
* @param cmd Command to send (EC_CMD_...)
|
||||
* @param cmd_version Version of command to send (EC_VER_...)
|
||||
* @param dout Output data (may be NULL If dout_len=0)
|
||||
* @param dout_len Size of output data in bytes
|
||||
* @param dinp Place to put pointer to response data
|
||||
* @param din_len Maximum size of response in bytes
|
||||
* @return number of bytes in response, or -1 on error
|
||||
*/
|
||||
static int old_lpc_command(struct cros_ec_dev *dev, uint8_t cmd,
|
||||
const uint8_t *dout, int dout_len,
|
||||
uint8_t **dinp, int din_len)
|
||||
{
|
||||
int ret, i;
|
||||
|
||||
if (dout_len > EC_OLD_PARAM_SIZE) {
|
||||
debug("%s: Cannot send %d bytes\n", __func__, dout_len);
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (din_len > EC_OLD_PARAM_SIZE) {
|
||||
debug("%s: Cannot receive %d bytes\n", __func__, din_len);
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (wait_for_sync(dev)) {
|
||||
debug("%s: Timeout waiting ready\n", __func__);
|
||||
return -1;
|
||||
}
|
||||
|
||||
debug_trace("cmd: %02x, ", cmd);
|
||||
for (i = 0; i < dout_len; i++) {
|
||||
debug_trace("%02x ", dout[i]);
|
||||
outb(dout[i], EC_LPC_ADDR_OLD_PARAM + i);
|
||||
}
|
||||
outb(cmd, EC_LPC_ADDR_HOST_CMD);
|
||||
debug_trace("\n");
|
||||
|
||||
if (wait_for_sync(dev)) {
|
||||
debug("%s: Timeout waiting ready\n", __func__);
|
||||
return -1;
|
||||
}
|
||||
|
||||
ret = inb(EC_LPC_ADDR_HOST_DATA);
|
||||
if (ret) {
|
||||
debug("%s: CROS_EC result code %d\n", __func__, ret);
|
||||
return -ret;
|
||||
}
|
||||
|
||||
debug_trace("resp: %02x, ", ret);
|
||||
for (i = 0; i < din_len; i++) {
|
||||
dev->din[i] = inb(EC_LPC_ADDR_OLD_PARAM + i);
|
||||
debug_trace("%02x ", dev->din[i]);
|
||||
}
|
||||
debug_trace("\n");
|
||||
*dinp = dev->din;
|
||||
|
||||
return din_len;
|
||||
}
|
||||
|
||||
int cros_ec_lpc_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version,
|
||||
const uint8_t *dout, int dout_len,
|
||||
uint8_t **dinp, int din_len)
|
||||
{
|
||||
const int cmd_addr = EC_LPC_ADDR_HOST_CMD;
|
||||
const int data_addr = EC_LPC_ADDR_HOST_DATA;
|
||||
const int args_addr = EC_LPC_ADDR_HOST_ARGS;
|
||||
const int param_addr = EC_LPC_ADDR_HOST_PARAM;
|
||||
|
||||
struct ec_lpc_host_args args;
|
||||
uint8_t *d;
|
||||
int csum;
|
||||
int i;
|
||||
|
||||
/* Fall back to old-style command interface if args aren't supported */
|
||||
if (!dev->cmd_version_is_supported)
|
||||
return old_lpc_command(dev, cmd, dout, dout_len, dinp,
|
||||
din_len);
|
||||
|
||||
if (dout_len > EC_HOST_PARAM_SIZE) {
|
||||
debug("%s: Cannot send %d bytes\n", __func__, dout_len);
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Fill in args */
|
||||
args.flags = EC_HOST_ARGS_FLAG_FROM_HOST;
|
||||
args.command_version = cmd_version;
|
||||
args.data_size = dout_len;
|
||||
|
||||
/* Calculate checksum */
|
||||
csum = cmd + args.flags + args.command_version + args.data_size;
|
||||
for (i = 0, d = (uint8_t *)dout; i < dout_len; i++, d++)
|
||||
csum += *d;
|
||||
|
||||
args.checksum = (uint8_t)csum;
|
||||
|
||||
if (wait_for_sync(dev)) {
|
||||
debug("%s: Timeout waiting ready\n", __func__);
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Write args */
|
||||
for (i = 0, d = (uint8_t *)&args; i < sizeof(args); i++, d++)
|
||||
outb(*d, args_addr + i);
|
||||
|
||||
/* Write data, if any */
|
||||
debug_trace("cmd: %02x, ver: %02x", cmd, cmd_version);
|
||||
for (i = 0, d = (uint8_t *)dout; i < dout_len; i++, d++) {
|
||||
outb(*d, param_addr + i);
|
||||
debug_trace("%02x ", *d);
|
||||
}
|
||||
|
||||
outb(cmd, cmd_addr);
|
||||
debug_trace("\n");
|
||||
|
||||
if (wait_for_sync(dev)) {
|
||||
debug("%s: Timeout waiting for response\n", __func__);
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Check result */
|
||||
i = inb(data_addr);
|
||||
if (i) {
|
||||
debug("%s: CROS_EC result code %d\n", __func__, i);
|
||||
return -i;
|
||||
}
|
||||
|
||||
/* Read back args */
|
||||
for (i = 0, d = (uint8_t *)&args; i < sizeof(args); i++, d++)
|
||||
*d = inb(args_addr + i);
|
||||
|
||||
/*
|
||||
* If EC didn't modify args flags, then somehow we sent a new-style
|
||||
* command to an old EC, which means it would have read its params
|
||||
* from the wrong place.
|
||||
*/
|
||||
if (!(args.flags & EC_HOST_ARGS_FLAG_TO_HOST)) {
|
||||
debug("%s: CROS_EC protocol mismatch\n", __func__);
|
||||
return -EC_RES_INVALID_RESPONSE;
|
||||
}
|
||||
|
||||
if (args.data_size > din_len) {
|
||||
debug("%s: CROS_EC returned too much data %d > %d\n",
|
||||
__func__, args.data_size, din_len);
|
||||
return -EC_RES_INVALID_RESPONSE;
|
||||
}
|
||||
|
||||
/* Read data, if any */
|
||||
for (i = 0, d = (uint8_t *)dev->din; i < args.data_size; i++, d++) {
|
||||
*d = inb(param_addr + i);
|
||||
debug_trace("%02x ", *d);
|
||||
}
|
||||
debug_trace("\n");
|
||||
|
||||
/* Verify checksum */
|
||||
csum = cmd + args.flags + args.command_version + args.data_size;
|
||||
for (i = 0, d = (uint8_t *)dev->din; i < args.data_size; i++, d++)
|
||||
csum += *d;
|
||||
|
||||
if (args.checksum != (uint8_t)csum) {
|
||||
debug("%s: CROS_EC response has invalid checksum\n", __func__);
|
||||
return -EC_RES_INVALID_CHECKSUM;
|
||||
}
|
||||
*dinp = dev->din;
|
||||
|
||||
/* Return actual amount of data received */
|
||||
return args.data_size;
|
||||
}
|
||||
|
||||
/**
|
||||
* Initialize LPC protocol.
|
||||
*
|
||||
* @param dev CROS_EC device
|
||||
* @param blob Device tree blob
|
||||
* @return 0 if ok, -1 on error
|
||||
*/
|
||||
int cros_ec_lpc_init(struct cros_ec_dev *dev, const void *blob)
|
||||
{
|
||||
int byte, i;
|
||||
|
||||
/* See if we can find an EC at the other end */
|
||||
byte = 0xff;
|
||||
byte &= inb(EC_LPC_ADDR_HOST_CMD);
|
||||
byte &= inb(EC_LPC_ADDR_HOST_DATA);
|
||||
for (i = 0; i < EC_HOST_PARAM_SIZE && (byte == 0xff); i++)
|
||||
byte &= inb(EC_LPC_ADDR_HOST_PARAM + i);
|
||||
if (byte == 0xff) {
|
||||
debug("%s: CROS_EC device not found on LPC bus\n",
|
||||
__func__);
|
||||
return -1;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Test if LPC command args are supported.
|
||||
*
|
||||
* The cheapest way to do this is by looking for the memory-mapped
|
||||
* flag. This is faster than sending a new-style 'hello' command and
|
||||
* seeing whether the EC sets the EC_HOST_ARGS_FLAG_FROM_HOST flag
|
||||
* in args when it responds.
|
||||
*/
|
||||
int cros_ec_lpc_check_version(struct cros_ec_dev *dev)
|
||||
{
|
||||
if (inb(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_ID) == 'E' &&
|
||||
inb(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_ID + 1)
|
||||
== 'C' &&
|
||||
(inb(EC_LPC_ADDR_MEMMAP +
|
||||
EC_MEMMAP_HOST_CMD_FLAGS) &
|
||||
EC_HOST_CMD_FLAG_LPC_ARGS_SUPPORTED)) {
|
||||
dev->cmd_version_is_supported = 1;
|
||||
} else {
|
||||
/* We are going to use the old IO ports */
|
||||
dev->cmd_version_is_supported = 0;
|
||||
}
|
||||
debug("lpc: version %s\n", dev->cmd_version_is_supported ?
|
||||
"new" : "old");
|
||||
|
||||
return 0;
|
||||
}
|
Loading…
Reference in a new issue