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