mirror of
https://github.com/AsahiLinux/u-boot
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88364387c6
This patch adds the cros_ec driver that implements the protocol for communicating with Google's ChromeOS embedded controller. Signed-off-by: Bernie Thompson <bhthompson@chromium.org> Signed-off-by: Bill Richardson <wfrichar@chromium.org> Signed-off-by: Che-Liang Chiou <clchiou@chromium.org> Signed-off-by: Doug Anderson <dianders@chromium.org> Signed-off-by: Gabe Black <gabeblack@chromium.org> Signed-off-by: Hung-ying Tyan <tyanh@chromium.org> Signed-off-by: Louis Yung-Chieh Lo <yjlou@chromium.org> Signed-off-by: Randall Spangler <rspangler@chromium.org> Signed-off-by: Sean Paul <seanpaul@chromium.org> Signed-off-by: Simon Glass <sjg@chromium.org> Signed-off-by: Vincent Palatin <vpalatin@chromium.org> Acked-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org>
1304 lines
33 KiB
C
1304 lines
33 KiB
C
/*
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* Chromium OS cros_ec driver
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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 <i2c.h>
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#include <cros_ec.h>
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#include <fdtdec.h>
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#include <malloc.h>
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#include <spi.h>
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#include <asm/io.h>
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#include <asm-generic/gpio.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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enum {
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/* Timeout waiting for a flash erase command to complete */
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CROS_EC_CMD_TIMEOUT_MS = 5000,
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/* Timeout waiting for a synchronous hash to be recomputed */
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CROS_EC_CMD_HASH_TIMEOUT_MS = 2000,
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};
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static struct cros_ec_dev static_dev, *last_dev;
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DECLARE_GLOBAL_DATA_PTR;
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/* Note: depends on enum ec_current_image */
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static const char * const ec_current_image_name[] = {"unknown", "RO", "RW"};
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void cros_ec_dump_data(const char *name, int cmd, const uint8_t *data, int len)
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{
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#ifdef DEBUG
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int i;
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printf("%s: ", name);
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if (cmd != -1)
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printf("cmd=%#x: ", cmd);
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for (i = 0; i < len; i++)
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printf("%02x ", data[i]);
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printf("\n");
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#endif
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}
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/*
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* Calculate a simple 8-bit checksum of a data block
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*
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* @param data Data block to checksum
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* @param size Size of data block in bytes
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* @return checksum value (0 to 255)
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*/
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int cros_ec_calc_checksum(const uint8_t *data, int size)
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{
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int csum, i;
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for (i = csum = 0; i < size; i++)
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csum += data[i];
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return csum & 0xff;
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}
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static int send_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version,
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const void *dout, int dout_len,
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uint8_t **dinp, int din_len)
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{
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int ret;
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switch (dev->interface) {
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#ifdef CONFIG_CROS_EC_SPI
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case CROS_EC_IF_SPI:
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ret = cros_ec_spi_command(dev, cmd, cmd_version,
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(const uint8_t *)dout, dout_len,
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dinp, din_len);
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break;
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#endif
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#ifdef CONFIG_CROS_EC_I2C
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case CROS_EC_IF_I2C:
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ret = cros_ec_i2c_command(dev, cmd, cmd_version,
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(const uint8_t *)dout, dout_len,
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dinp, din_len);
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break;
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#endif
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#ifdef CONFIG_CROS_EC_LPC
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case CROS_EC_IF_LPC:
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ret = cros_ec_lpc_command(dev, cmd, cmd_version,
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(const uint8_t *)dout, dout_len,
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dinp, din_len);
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break;
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#endif
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case CROS_EC_IF_NONE:
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default:
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ret = -1;
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}
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return ret;
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}
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/**
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* Send a command to the 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 Response data (may be NULL If din_len=0).
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* If not NULL, it will be updated to point to the data
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* and will always be double word aligned (64-bits)
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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 ec_command_inptr(struct cros_ec_dev *dev, uint8_t cmd,
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int cmd_version, const void *dout, int dout_len, uint8_t **dinp,
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int din_len)
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{
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uint8_t *din;
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int len;
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if (cmd_version != 0 && !dev->cmd_version_is_supported) {
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debug("%s: Command version >0 unsupported\n", __func__);
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return -1;
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}
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len = send_command(dev, cmd, cmd_version, dout, dout_len,
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&din, din_len);
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/* If the command doesn't complete, wait a while */
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if (len == -EC_RES_IN_PROGRESS) {
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struct ec_response_get_comms_status *resp;
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ulong start;
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/* Wait for command to complete */
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start = get_timer(0);
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do {
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int ret;
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mdelay(50); /* Insert some reasonable delay */
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ret = send_command(dev, EC_CMD_GET_COMMS_STATUS, 0,
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NULL, 0,
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(uint8_t **)&resp, sizeof(*resp));
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if (ret < 0)
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return ret;
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if (get_timer(start) > CROS_EC_CMD_TIMEOUT_MS) {
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debug("%s: Command %#02x timeout\n",
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__func__, cmd);
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return -EC_RES_TIMEOUT;
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}
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} while (resp->flags & EC_COMMS_STATUS_PROCESSING);
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/* OK it completed, so read the status response */
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/* not sure why it was 0 for the last argument */
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len = send_command(dev, EC_CMD_RESEND_RESPONSE, 0,
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NULL, 0, &din, din_len);
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}
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debug("%s: len=%d, dinp=%p, *dinp=%p\n", __func__, len, dinp, *dinp);
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if (dinp) {
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/* If we have any data to return, it must be 64bit-aligned */
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assert(len <= 0 || !((uintptr_t)din & 7));
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*dinp = din;
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}
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return len;
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}
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/**
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* Send a command to the 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 din Response data (may be NULL If din_len=0).
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* It not NULL, it is a place for ec_command() to copy the
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* data to.
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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 ec_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version,
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const void *dout, int dout_len,
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void *din, int din_len)
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{
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uint8_t *in_buffer;
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int len;
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assert((din_len == 0) || din);
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len = ec_command_inptr(dev, cmd, cmd_version, dout, dout_len,
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&in_buffer, din_len);
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if (len > 0) {
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/*
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* If we were asked to put it somewhere, do so, otherwise just
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* disregard the result.
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*/
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if (din && in_buffer) {
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assert(len <= din_len);
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memmove(din, in_buffer, len);
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}
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}
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return len;
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}
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int cros_ec_scan_keyboard(struct cros_ec_dev *dev, struct mbkp_keyscan *scan)
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{
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if (ec_command(dev, EC_CMD_CROS_EC_STATE, 0, NULL, 0, scan,
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sizeof(scan->data)) < sizeof(scan->data))
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return -1;
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return 0;
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}
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int cros_ec_read_id(struct cros_ec_dev *dev, char *id, int maxlen)
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{
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struct ec_response_get_version *r;
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if (ec_command_inptr(dev, EC_CMD_GET_VERSION, 0, NULL, 0,
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(uint8_t **)&r, sizeof(*r)) < sizeof(*r))
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return -1;
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if (maxlen > sizeof(r->version_string_ro))
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maxlen = sizeof(r->version_string_ro);
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switch (r->current_image) {
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case EC_IMAGE_RO:
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memcpy(id, r->version_string_ro, maxlen);
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break;
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case EC_IMAGE_RW:
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memcpy(id, r->version_string_rw, maxlen);
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break;
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default:
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return -1;
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}
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id[maxlen - 1] = '\0';
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return 0;
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}
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int cros_ec_read_version(struct cros_ec_dev *dev,
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struct ec_response_get_version **versionp)
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{
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if (ec_command_inptr(dev, EC_CMD_GET_VERSION, 0, NULL, 0,
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(uint8_t **)versionp, sizeof(**versionp))
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< sizeof(**versionp))
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return -1;
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return 0;
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}
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int cros_ec_read_build_info(struct cros_ec_dev *dev, char **strp)
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{
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if (ec_command_inptr(dev, EC_CMD_GET_BUILD_INFO, 0, NULL, 0,
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(uint8_t **)strp, EC_HOST_PARAM_SIZE) < 0)
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return -1;
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return 0;
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}
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int cros_ec_read_current_image(struct cros_ec_dev *dev,
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enum ec_current_image *image)
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{
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struct ec_response_get_version *r;
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if (ec_command_inptr(dev, EC_CMD_GET_VERSION, 0, NULL, 0,
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(uint8_t **)&r, sizeof(*r)) < sizeof(*r))
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return -1;
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*image = r->current_image;
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return 0;
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}
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static int cros_ec_wait_on_hash_done(struct cros_ec_dev *dev,
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struct ec_response_vboot_hash *hash)
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{
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struct ec_params_vboot_hash p;
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ulong start;
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start = get_timer(0);
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while (hash->status == EC_VBOOT_HASH_STATUS_BUSY) {
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mdelay(50); /* Insert some reasonable delay */
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p.cmd = EC_VBOOT_HASH_GET;
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if (ec_command(dev, EC_CMD_VBOOT_HASH, 0, &p, sizeof(p),
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hash, sizeof(*hash)) < 0)
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return -1;
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if (get_timer(start) > CROS_EC_CMD_HASH_TIMEOUT_MS) {
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debug("%s: EC_VBOOT_HASH_GET timeout\n", __func__);
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return -EC_RES_TIMEOUT;
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}
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}
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return 0;
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}
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int cros_ec_read_hash(struct cros_ec_dev *dev,
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struct ec_response_vboot_hash *hash)
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{
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struct ec_params_vboot_hash p;
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int rv;
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p.cmd = EC_VBOOT_HASH_GET;
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if (ec_command(dev, EC_CMD_VBOOT_HASH, 0, &p, sizeof(p),
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hash, sizeof(*hash)) < 0)
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return -1;
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/* If the EC is busy calculating the hash, fidget until it's done. */
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rv = cros_ec_wait_on_hash_done(dev, hash);
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if (rv)
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return rv;
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/* If the hash is valid, we're done. Otherwise, we have to kick it off
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* again and wait for it to complete. Note that we explicitly assume
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* that hashing zero bytes is always wrong, even though that would
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* produce a valid hash value. */
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if (hash->status == EC_VBOOT_HASH_STATUS_DONE && hash->size)
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return 0;
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debug("%s: No valid hash (status=%d size=%d). Compute one...\n",
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__func__, hash->status, hash->size);
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p.cmd = EC_VBOOT_HASH_RECALC;
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p.hash_type = EC_VBOOT_HASH_TYPE_SHA256;
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p.nonce_size = 0;
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p.offset = EC_VBOOT_HASH_OFFSET_RW;
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if (ec_command(dev, EC_CMD_VBOOT_HASH, 0, &p, sizeof(p),
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hash, sizeof(*hash)) < 0)
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return -1;
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rv = cros_ec_wait_on_hash_done(dev, hash);
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if (rv)
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return rv;
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debug("%s: hash done\n", __func__);
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return 0;
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}
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static int cros_ec_invalidate_hash(struct cros_ec_dev *dev)
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{
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struct ec_params_vboot_hash p;
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struct ec_response_vboot_hash *hash;
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/* We don't have an explict command for the EC to discard its current
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* hash value, so we'll just tell it to calculate one that we know is
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* wrong (we claim that hashing zero bytes is always invalid).
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*/
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p.cmd = EC_VBOOT_HASH_RECALC;
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p.hash_type = EC_VBOOT_HASH_TYPE_SHA256;
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p.nonce_size = 0;
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p.offset = 0;
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p.size = 0;
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debug("%s:\n", __func__);
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if (ec_command_inptr(dev, EC_CMD_VBOOT_HASH, 0, &p, sizeof(p),
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(uint8_t **)&hash, sizeof(*hash)) < 0)
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return -1;
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/* No need to wait for it to finish */
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return 0;
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}
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int cros_ec_reboot(struct cros_ec_dev *dev, enum ec_reboot_cmd cmd,
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uint8_t flags)
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{
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struct ec_params_reboot_ec p;
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p.cmd = cmd;
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p.flags = flags;
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if (ec_command_inptr(dev, EC_CMD_REBOOT_EC, 0, &p, sizeof(p), NULL, 0)
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< 0)
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return -1;
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if (!(flags & EC_REBOOT_FLAG_ON_AP_SHUTDOWN)) {
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/*
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* EC reboot will take place immediately so delay to allow it
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* to complete. Note that some reboot types (EC_REBOOT_COLD)
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* will reboot the AP as well, in which case we won't actually
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* get to this point.
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*/
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/*
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* TODO(rspangler@chromium.org): Would be nice if we had a
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* better way to determine when the reboot is complete. Could
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* we poll a memory-mapped LPC value?
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*/
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udelay(50000);
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}
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return 0;
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}
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int cros_ec_interrupt_pending(struct cros_ec_dev *dev)
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{
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/* no interrupt support : always poll */
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if (!fdt_gpio_isvalid(&dev->ec_int))
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return 1;
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return !gpio_get_value(dev->ec_int.gpio);
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}
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int cros_ec_info(struct cros_ec_dev *dev, struct ec_response_cros_ec_info *info)
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{
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if (ec_command(dev, EC_CMD_CROS_EC_INFO, 0, NULL, 0, info,
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sizeof(*info)) < sizeof(*info))
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return -1;
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return 0;
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}
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int cros_ec_get_host_events(struct cros_ec_dev *dev, uint32_t *events_ptr)
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{
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struct ec_response_host_event_mask *resp;
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/*
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* Use the B copy of the event flags, because the main copy is already
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* used by ACPI/SMI.
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*/
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if (ec_command_inptr(dev, EC_CMD_HOST_EVENT_GET_B, 0, NULL, 0,
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(uint8_t **)&resp, sizeof(*resp)) < sizeof(*resp))
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return -1;
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if (resp->mask & EC_HOST_EVENT_MASK(EC_HOST_EVENT_INVALID))
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return -1;
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*events_ptr = resp->mask;
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return 0;
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}
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int cros_ec_clear_host_events(struct cros_ec_dev *dev, uint32_t events)
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{
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struct ec_params_host_event_mask params;
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params.mask = events;
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/*
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* Use the B copy of the event flags, so it affects the data returned
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* by cros_ec_get_host_events().
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*/
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if (ec_command_inptr(dev, EC_CMD_HOST_EVENT_CLEAR_B, 0,
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¶ms, sizeof(params), NULL, 0) < 0)
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return -1;
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return 0;
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}
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int cros_ec_flash_protect(struct cros_ec_dev *dev,
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uint32_t set_mask, uint32_t set_flags,
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struct ec_response_flash_protect *resp)
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{
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struct ec_params_flash_protect params;
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params.mask = set_mask;
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params.flags = set_flags;
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if (ec_command(dev, EC_CMD_FLASH_PROTECT, EC_VER_FLASH_PROTECT,
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¶ms, sizeof(params),
|
|
resp, sizeof(*resp)) < sizeof(*resp))
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cros_ec_check_version(struct cros_ec_dev *dev)
|
|
{
|
|
struct ec_params_hello req;
|
|
struct ec_response_hello *resp;
|
|
|
|
#ifdef CONFIG_CROS_EC_LPC
|
|
/* LPC has its own way of doing this */
|
|
if (dev->interface == CROS_EC_IF_LPC)
|
|
return cros_ec_lpc_check_version(dev);
|
|
#endif
|
|
|
|
/*
|
|
* TODO(sjg@chromium.org).
|
|
* There is a strange oddity here with the EC. We could just ignore
|
|
* the response, i.e. pass the last two parameters as NULL and 0.
|
|
* In this case we won't read back very many bytes from the EC.
|
|
* On the I2C bus the EC gets upset about this and will try to send
|
|
* the bytes anyway. This means that we will have to wait for that
|
|
* to complete before continuing with a new EC command.
|
|
*
|
|
* This problem is probably unique to the I2C bus.
|
|
*
|
|
* So for now, just read all the data anyway.
|
|
*/
|
|
dev->cmd_version_is_supported = 1;
|
|
if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req, sizeof(req),
|
|
(uint8_t **)&resp, sizeof(*resp)) > 0) {
|
|
/* It appears to understand new version commands */
|
|
dev->cmd_version_is_supported = 1;
|
|
} else {
|
|
dev->cmd_version_is_supported = 0;
|
|
if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req,
|
|
sizeof(req), (uint8_t **)&resp,
|
|
sizeof(*resp)) < 0) {
|
|
debug("%s: Failed both old and new command style\n",
|
|
__func__);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cros_ec_test(struct cros_ec_dev *dev)
|
|
{
|
|
struct ec_params_hello req;
|
|
struct ec_response_hello *resp;
|
|
|
|
req.in_data = 0x12345678;
|
|
if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req, sizeof(req),
|
|
(uint8_t **)&resp, sizeof(*resp)) < sizeof(*resp)) {
|
|
printf("ec_command_inptr() returned error\n");
|
|
return -1;
|
|
}
|
|
if (resp->out_data != req.in_data + 0x01020304) {
|
|
printf("Received invalid handshake %x\n", resp->out_data);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cros_ec_flash_offset(struct cros_ec_dev *dev, enum ec_flash_region region,
|
|
uint32_t *offset, uint32_t *size)
|
|
{
|
|
struct ec_params_flash_region_info p;
|
|
struct ec_response_flash_region_info *r;
|
|
int ret;
|
|
|
|
p.region = region;
|
|
ret = ec_command_inptr(dev, EC_CMD_FLASH_REGION_INFO,
|
|
EC_VER_FLASH_REGION_INFO,
|
|
&p, sizeof(p), (uint8_t **)&r, sizeof(*r));
|
|
if (ret != sizeof(*r))
|
|
return -1;
|
|
|
|
if (offset)
|
|
*offset = r->offset;
|
|
if (size)
|
|
*size = r->size;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cros_ec_flash_erase(struct cros_ec_dev *dev, uint32_t offset, uint32_t size)
|
|
{
|
|
struct ec_params_flash_erase p;
|
|
|
|
p.offset = offset;
|
|
p.size = size;
|
|
return ec_command_inptr(dev, EC_CMD_FLASH_ERASE, 0, &p, sizeof(p),
|
|
NULL, 0);
|
|
}
|
|
|
|
/**
|
|
* Write a single block to the flash
|
|
*
|
|
* Write a block of data to the EC flash. The size must not exceed the flash
|
|
* write block size which you can obtain from cros_ec_flash_write_burst_size().
|
|
*
|
|
* The offset starts at 0. You can obtain the region information from
|
|
* cros_ec_flash_offset() to find out where to write for a particular region.
|
|
*
|
|
* Attempting to write to the region where the EC is currently running from
|
|
* will result in an error.
|
|
*
|
|
* @param dev CROS-EC device
|
|
* @param data Pointer to data buffer to write
|
|
* @param offset Offset within flash to write to.
|
|
* @param size Number of bytes to write
|
|
* @return 0 if ok, -1 on error
|
|
*/
|
|
static int cros_ec_flash_write_block(struct cros_ec_dev *dev,
|
|
const uint8_t *data, uint32_t offset, uint32_t size)
|
|
{
|
|
struct ec_params_flash_write p;
|
|
|
|
p.offset = offset;
|
|
p.size = size;
|
|
assert(data && p.size <= sizeof(p.data));
|
|
memcpy(p.data, data, p.size);
|
|
|
|
return ec_command_inptr(dev, EC_CMD_FLASH_WRITE, 0,
|
|
&p, sizeof(p), NULL, 0) >= 0 ? 0 : -1;
|
|
}
|
|
|
|
/**
|
|
* Return optimal flash write burst size
|
|
*/
|
|
static int cros_ec_flash_write_burst_size(struct cros_ec_dev *dev)
|
|
{
|
|
struct ec_params_flash_write p;
|
|
return sizeof(p.data);
|
|
}
|
|
|
|
/**
|
|
* Check if a block of data is erased (all 0xff)
|
|
*
|
|
* This function is useful when dealing with flash, for checking whether a
|
|
* data block is erased and thus does not need to be programmed.
|
|
*
|
|
* @param data Pointer to data to check (must be word-aligned)
|
|
* @param size Number of bytes to check (must be word-aligned)
|
|
* @return 0 if erased, non-zero if any word is not erased
|
|
*/
|
|
static int cros_ec_data_is_erased(const uint32_t *data, int size)
|
|
{
|
|
assert(!(size & 3));
|
|
size /= sizeof(uint32_t);
|
|
for (; size > 0; size -= 4, data++)
|
|
if (*data != -1U)
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
int cros_ec_flash_write(struct cros_ec_dev *dev, const uint8_t *data,
|
|
uint32_t offset, uint32_t size)
|
|
{
|
|
uint32_t burst = cros_ec_flash_write_burst_size(dev);
|
|
uint32_t end, off;
|
|
int ret;
|
|
|
|
/*
|
|
* TODO: round up to the nearest multiple of write size. Can get away
|
|
* without that on link right now because its write size is 4 bytes.
|
|
*/
|
|
end = offset + size;
|
|
for (off = offset; off < end; off += burst, data += burst) {
|
|
uint32_t todo;
|
|
|
|
/* If the data is empty, there is no point in programming it */
|
|
todo = min(end - off, burst);
|
|
if (dev->optimise_flash_write &&
|
|
cros_ec_data_is_erased((uint32_t *)data, todo))
|
|
continue;
|
|
|
|
ret = cros_ec_flash_write_block(dev, data, off, todo);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Read a single block from the flash
|
|
*
|
|
* Read a block of data from the EC flash. The size must not exceed the flash
|
|
* write block size which you can obtain from cros_ec_flash_write_burst_size().
|
|
*
|
|
* The offset starts at 0. You can obtain the region information from
|
|
* cros_ec_flash_offset() to find out where to read for a particular region.
|
|
*
|
|
* @param dev CROS-EC device
|
|
* @param data Pointer to data buffer to read into
|
|
* @param offset Offset within flash to read from
|
|
* @param size Number of bytes to read
|
|
* @return 0 if ok, -1 on error
|
|
*/
|
|
static int cros_ec_flash_read_block(struct cros_ec_dev *dev, uint8_t *data,
|
|
uint32_t offset, uint32_t size)
|
|
{
|
|
struct ec_params_flash_read p;
|
|
|
|
p.offset = offset;
|
|
p.size = size;
|
|
|
|
return ec_command(dev, EC_CMD_FLASH_READ, 0,
|
|
&p, sizeof(p), data, size) >= 0 ? 0 : -1;
|
|
}
|
|
|
|
int cros_ec_flash_read(struct cros_ec_dev *dev, uint8_t *data, uint32_t offset,
|
|
uint32_t size)
|
|
{
|
|
uint32_t burst = cros_ec_flash_write_burst_size(dev);
|
|
uint32_t end, off;
|
|
int ret;
|
|
|
|
end = offset + size;
|
|
for (off = offset; off < end; off += burst, data += burst) {
|
|
ret = cros_ec_flash_read_block(dev, data, off,
|
|
min(end - off, burst));
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cros_ec_flash_update_rw(struct cros_ec_dev *dev,
|
|
const uint8_t *image, int image_size)
|
|
{
|
|
uint32_t rw_offset, rw_size;
|
|
int ret;
|
|
|
|
if (cros_ec_flash_offset(dev, EC_FLASH_REGION_RW, &rw_offset, &rw_size))
|
|
return -1;
|
|
if (image_size > rw_size)
|
|
return -1;
|
|
|
|
/* Invalidate the existing hash, just in case the AP reboots
|
|
* unexpectedly during the update. If that happened, the EC RW firmware
|
|
* would be invalid, but the EC would still have the original hash.
|
|
*/
|
|
ret = cros_ec_invalidate_hash(dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* Erase the entire RW section, so that the EC doesn't see any garbage
|
|
* past the new image if it's smaller than the current image.
|
|
*
|
|
* TODO: could optimize this to erase just the current image, since
|
|
* presumably everything past that is 0xff's. But would still need to
|
|
* round up to the nearest multiple of erase size.
|
|
*/
|
|
ret = cros_ec_flash_erase(dev, rw_offset, rw_size);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Write the image */
|
|
ret = cros_ec_flash_write(dev, image, rw_offset, image_size);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cros_ec_read_vbnvcontext(struct cros_ec_dev *dev, uint8_t *block)
|
|
{
|
|
struct ec_params_vbnvcontext p;
|
|
int len;
|
|
|
|
p.op = EC_VBNV_CONTEXT_OP_READ;
|
|
|
|
len = ec_command(dev, EC_CMD_VBNV_CONTEXT, EC_VER_VBNV_CONTEXT,
|
|
&p, sizeof(p), block, EC_VBNV_BLOCK_SIZE);
|
|
if (len < EC_VBNV_BLOCK_SIZE)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cros_ec_write_vbnvcontext(struct cros_ec_dev *dev, const uint8_t *block)
|
|
{
|
|
struct ec_params_vbnvcontext p;
|
|
int len;
|
|
|
|
p.op = EC_VBNV_CONTEXT_OP_WRITE;
|
|
memcpy(p.block, block, sizeof(p.block));
|
|
|
|
len = ec_command_inptr(dev, EC_CMD_VBNV_CONTEXT, EC_VER_VBNV_CONTEXT,
|
|
&p, sizeof(p), NULL, 0);
|
|
if (len < 0)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cros_ec_set_ldo(struct cros_ec_dev *dev, uint8_t index, uint8_t state)
|
|
{
|
|
struct ec_params_ldo_set params;
|
|
|
|
params.index = index;
|
|
params.state = state;
|
|
|
|
if (ec_command_inptr(dev, EC_CMD_LDO_SET, 0,
|
|
¶ms, sizeof(params),
|
|
NULL, 0))
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cros_ec_get_ldo(struct cros_ec_dev *dev, uint8_t index, uint8_t *state)
|
|
{
|
|
struct ec_params_ldo_get params;
|
|
struct ec_response_ldo_get *resp;
|
|
|
|
params.index = index;
|
|
|
|
if (ec_command_inptr(dev, EC_CMD_LDO_GET, 0,
|
|
¶ms, sizeof(params),
|
|
(uint8_t **)&resp, sizeof(*resp)) < sizeof(*resp))
|
|
return -1;
|
|
|
|
*state = resp->state;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Decode MBKP details from the device tree and allocate a suitable device.
|
|
*
|
|
* @param blob Device tree blob
|
|
* @param node Node to decode from
|
|
* @param devp Returns a pointer to the new allocated device
|
|
* @return 0 if ok, -1 on error
|
|
*/
|
|
static int cros_ec_decode_fdt(const void *blob, int node,
|
|
struct cros_ec_dev **devp)
|
|
{
|
|
enum fdt_compat_id compat;
|
|
struct cros_ec_dev *dev;
|
|
int parent;
|
|
|
|
/* See what type of parent we are inside (this is expensive) */
|
|
parent = fdt_parent_offset(blob, node);
|
|
if (parent < 0) {
|
|
debug("%s: Cannot find node parent\n", __func__);
|
|
return -1;
|
|
}
|
|
|
|
dev = &static_dev;
|
|
dev->node = node;
|
|
dev->parent_node = parent;
|
|
|
|
compat = fdtdec_lookup(blob, parent);
|
|
switch (compat) {
|
|
#ifdef CONFIG_CROS_EC_SPI
|
|
case COMPAT_SAMSUNG_EXYNOS_SPI:
|
|
dev->interface = CROS_EC_IF_SPI;
|
|
if (cros_ec_spi_decode_fdt(dev, blob))
|
|
return -1;
|
|
break;
|
|
#endif
|
|
#ifdef CONFIG_CROS_EC_I2C
|
|
case COMPAT_SAMSUNG_S3C2440_I2C:
|
|
dev->interface = CROS_EC_IF_I2C;
|
|
if (cros_ec_i2c_decode_fdt(dev, blob))
|
|
return -1;
|
|
break;
|
|
#endif
|
|
#ifdef CONFIG_CROS_EC_LPC
|
|
case COMPAT_INTEL_LPC:
|
|
dev->interface = CROS_EC_IF_LPC;
|
|
break;
|
|
#endif
|
|
default:
|
|
debug("%s: Unknown compat id %d\n", __func__, compat);
|
|
return -1;
|
|
}
|
|
|
|
fdtdec_decode_gpio(blob, node, "ec-interrupt", &dev->ec_int);
|
|
dev->optimise_flash_write = fdtdec_get_bool(blob, node,
|
|
"optimise-flash-write");
|
|
*devp = dev;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cros_ec_init(const void *blob, struct cros_ec_dev **cros_ecp)
|
|
{
|
|
char id[MSG_BYTES];
|
|
struct cros_ec_dev *dev;
|
|
int node = 0;
|
|
|
|
*cros_ecp = NULL;
|
|
do {
|
|
node = fdtdec_next_compatible(blob, node,
|
|
COMPAT_GOOGLE_CROS_EC);
|
|
if (node < 0) {
|
|
debug("%s: Node not found\n", __func__);
|
|
return 0;
|
|
}
|
|
} while (!fdtdec_get_is_enabled(blob, node));
|
|
|
|
if (cros_ec_decode_fdt(blob, node, &dev)) {
|
|
debug("%s: Failed to decode device.\n", __func__);
|
|
return -CROS_EC_ERR_FDT_DECODE;
|
|
}
|
|
|
|
switch (dev->interface) {
|
|
#ifdef CONFIG_CROS_EC_SPI
|
|
case CROS_EC_IF_SPI:
|
|
if (cros_ec_spi_init(dev, blob)) {
|
|
debug("%s: Could not setup SPI interface\n", __func__);
|
|
return -CROS_EC_ERR_DEV_INIT;
|
|
}
|
|
break;
|
|
#endif
|
|
#ifdef CONFIG_CROS_EC_I2C
|
|
case CROS_EC_IF_I2C:
|
|
if (cros_ec_i2c_init(dev, blob))
|
|
return -CROS_EC_ERR_DEV_INIT;
|
|
break;
|
|
#endif
|
|
#ifdef CONFIG_CROS_EC_LPC
|
|
case CROS_EC_IF_LPC:
|
|
if (cros_ec_lpc_init(dev, blob))
|
|
return -CROS_EC_ERR_DEV_INIT;
|
|
break;
|
|
#endif
|
|
case CROS_EC_IF_NONE:
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
/* we will poll the EC interrupt line */
|
|
fdtdec_setup_gpio(&dev->ec_int);
|
|
if (fdt_gpio_isvalid(&dev->ec_int))
|
|
gpio_direction_input(dev->ec_int.gpio);
|
|
|
|
if (cros_ec_check_version(dev)) {
|
|
debug("%s: Could not detect CROS-EC version\n", __func__);
|
|
return -CROS_EC_ERR_CHECK_VERSION;
|
|
}
|
|
|
|
if (cros_ec_read_id(dev, id, sizeof(id))) {
|
|
debug("%s: Could not read KBC ID\n", __func__);
|
|
return -CROS_EC_ERR_READ_ID;
|
|
}
|
|
|
|
/* Remember this device for use by the cros_ec command */
|
|
last_dev = *cros_ecp = dev;
|
|
debug("Google Chrome EC CROS-EC driver ready, id '%s'\n", id);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_CMD_CROS_EC
|
|
int cros_ec_decode_region(int argc, char * const argv[])
|
|
{
|
|
if (argc > 0) {
|
|
if (0 == strcmp(*argv, "rw"))
|
|
return EC_FLASH_REGION_RW;
|
|
else if (0 == strcmp(*argv, "ro"))
|
|
return EC_FLASH_REGION_RO;
|
|
|
|
debug("%s: Invalid region '%s'\n", __func__, *argv);
|
|
} else {
|
|
debug("%s: Missing region parameter\n", __func__);
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* Perform a flash read or write command
|
|
*
|
|
* @param dev CROS-EC device to read/write
|
|
* @param is_write 1 do to a write, 0 to do a read
|
|
* @param argc Number of arguments
|
|
* @param argv Arguments (2 is region, 3 is address)
|
|
* @return 0 for ok, 1 for a usage error or -ve for ec command error
|
|
* (negative EC_RES_...)
|
|
*/
|
|
static int do_read_write(struct cros_ec_dev *dev, int is_write, int argc,
|
|
char * const argv[])
|
|
{
|
|
uint32_t offset, size = -1U, region_size;
|
|
unsigned long addr;
|
|
char *endp;
|
|
int region;
|
|
int ret;
|
|
|
|
region = cros_ec_decode_region(argc - 2, argv + 2);
|
|
if (region == -1)
|
|
return 1;
|
|
if (argc < 4)
|
|
return 1;
|
|
addr = simple_strtoul(argv[3], &endp, 16);
|
|
if (*argv[3] == 0 || *endp != 0)
|
|
return 1;
|
|
if (argc > 4) {
|
|
size = simple_strtoul(argv[4], &endp, 16);
|
|
if (*argv[4] == 0 || *endp != 0)
|
|
return 1;
|
|
}
|
|
|
|
ret = cros_ec_flash_offset(dev, region, &offset, ®ion_size);
|
|
if (ret) {
|
|
debug("%s: Could not read region info\n", __func__);
|
|
return ret;
|
|
}
|
|
if (size == -1U)
|
|
size = region_size;
|
|
|
|
ret = is_write ?
|
|
cros_ec_flash_write(dev, (uint8_t *)addr, offset, size) :
|
|
cros_ec_flash_read(dev, (uint8_t *)addr, offset, size);
|
|
if (ret) {
|
|
debug("%s: Could not %s region\n", __func__,
|
|
is_write ? "write" : "read");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int do_cros_ec(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
|
|
{
|
|
struct cros_ec_dev *dev = last_dev;
|
|
const char *cmd;
|
|
int ret = 0;
|
|
|
|
if (argc < 2)
|
|
return CMD_RET_USAGE;
|
|
|
|
cmd = argv[1];
|
|
if (0 == strcmp("init", cmd)) {
|
|
ret = cros_ec_init(gd->fdt_blob, &dev);
|
|
if (ret) {
|
|
printf("Could not init cros_ec device (err %d)\n", ret);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Just use the last allocated device; there should be only one */
|
|
if (!last_dev) {
|
|
printf("No CROS-EC device available\n");
|
|
return 1;
|
|
}
|
|
if (0 == strcmp("id", cmd)) {
|
|
char id[MSG_BYTES];
|
|
|
|
if (cros_ec_read_id(dev, id, sizeof(id))) {
|
|
debug("%s: Could not read KBC ID\n", __func__);
|
|
return 1;
|
|
}
|
|
printf("%s\n", id);
|
|
} else if (0 == strcmp("info", cmd)) {
|
|
struct ec_response_cros_ec_info info;
|
|
|
|
if (cros_ec_info(dev, &info)) {
|
|
debug("%s: Could not read KBC info\n", __func__);
|
|
return 1;
|
|
}
|
|
printf("rows = %u\n", info.rows);
|
|
printf("cols = %u\n", info.cols);
|
|
printf("switches = %#x\n", info.switches);
|
|
} else if (0 == strcmp("curimage", cmd)) {
|
|
enum ec_current_image image;
|
|
|
|
if (cros_ec_read_current_image(dev, &image)) {
|
|
debug("%s: Could not read KBC image\n", __func__);
|
|
return 1;
|
|
}
|
|
printf("%d\n", image);
|
|
} else if (0 == strcmp("hash", cmd)) {
|
|
struct ec_response_vboot_hash hash;
|
|
int i;
|
|
|
|
if (cros_ec_read_hash(dev, &hash)) {
|
|
debug("%s: Could not read KBC hash\n", __func__);
|
|
return 1;
|
|
}
|
|
|
|
if (hash.hash_type == EC_VBOOT_HASH_TYPE_SHA256)
|
|
printf("type: SHA-256\n");
|
|
else
|
|
printf("type: %d\n", hash.hash_type);
|
|
|
|
printf("offset: 0x%08x\n", hash.offset);
|
|
printf("size: 0x%08x\n", hash.size);
|
|
|
|
printf("digest: ");
|
|
for (i = 0; i < hash.digest_size; i++)
|
|
printf("%02x", hash.hash_digest[i]);
|
|
printf("\n");
|
|
} else if (0 == strcmp("reboot", cmd)) {
|
|
int region;
|
|
enum ec_reboot_cmd cmd;
|
|
|
|
if (argc >= 3 && !strcmp(argv[2], "cold"))
|
|
cmd = EC_REBOOT_COLD;
|
|
else {
|
|
region = cros_ec_decode_region(argc - 2, argv + 2);
|
|
if (region == EC_FLASH_REGION_RO)
|
|
cmd = EC_REBOOT_JUMP_RO;
|
|
else if (region == EC_FLASH_REGION_RW)
|
|
cmd = EC_REBOOT_JUMP_RW;
|
|
else
|
|
return CMD_RET_USAGE;
|
|
}
|
|
|
|
if (cros_ec_reboot(dev, cmd, 0)) {
|
|
debug("%s: Could not reboot KBC\n", __func__);
|
|
return 1;
|
|
}
|
|
} else if (0 == strcmp("events", cmd)) {
|
|
uint32_t events;
|
|
|
|
if (cros_ec_get_host_events(dev, &events)) {
|
|
debug("%s: Could not read host events\n", __func__);
|
|
return 1;
|
|
}
|
|
printf("0x%08x\n", events);
|
|
} else if (0 == strcmp("clrevents", cmd)) {
|
|
uint32_t events = 0x7fffffff;
|
|
|
|
if (argc >= 3)
|
|
events = simple_strtol(argv[2], NULL, 0);
|
|
|
|
if (cros_ec_clear_host_events(dev, events)) {
|
|
debug("%s: Could not clear host events\n", __func__);
|
|
return 1;
|
|
}
|
|
} else if (0 == strcmp("read", cmd)) {
|
|
ret = do_read_write(dev, 0, argc, argv);
|
|
if (ret > 0)
|
|
return CMD_RET_USAGE;
|
|
} else if (0 == strcmp("write", cmd)) {
|
|
ret = do_read_write(dev, 1, argc, argv);
|
|
if (ret > 0)
|
|
return CMD_RET_USAGE;
|
|
} else if (0 == strcmp("erase", cmd)) {
|
|
int region = cros_ec_decode_region(argc - 2, argv + 2);
|
|
uint32_t offset, size;
|
|
|
|
if (region == -1)
|
|
return CMD_RET_USAGE;
|
|
if (cros_ec_flash_offset(dev, region, &offset, &size)) {
|
|
debug("%s: Could not read region info\n", __func__);
|
|
ret = -1;
|
|
} else {
|
|
ret = cros_ec_flash_erase(dev, offset, size);
|
|
if (ret) {
|
|
debug("%s: Could not erase region\n",
|
|
__func__);
|
|
}
|
|
}
|
|
} else if (0 == strcmp("regioninfo", cmd)) {
|
|
int region = cros_ec_decode_region(argc - 2, argv + 2);
|
|
uint32_t offset, size;
|
|
|
|
if (region == -1)
|
|
return CMD_RET_USAGE;
|
|
ret = cros_ec_flash_offset(dev, region, &offset, &size);
|
|
if (ret) {
|
|
debug("%s: Could not read region info\n", __func__);
|
|
} else {
|
|
printf("Region: %s\n", region == EC_FLASH_REGION_RO ?
|
|
"RO" : "RW");
|
|
printf("Offset: %x\n", offset);
|
|
printf("Size: %x\n", size);
|
|
}
|
|
} else if (0 == strcmp("vbnvcontext", cmd)) {
|
|
uint8_t block[EC_VBNV_BLOCK_SIZE];
|
|
char buf[3];
|
|
int i, len;
|
|
unsigned long result;
|
|
|
|
if (argc <= 2) {
|
|
ret = cros_ec_read_vbnvcontext(dev, block);
|
|
if (!ret) {
|
|
printf("vbnv_block: ");
|
|
for (i = 0; i < EC_VBNV_BLOCK_SIZE; i++)
|
|
printf("%02x", block[i]);
|
|
putc('\n');
|
|
}
|
|
} else {
|
|
/*
|
|
* TODO(clchiou): Move this to a utility function as
|
|
* cmd_spi might want to call it.
|
|
*/
|
|
memset(block, 0, EC_VBNV_BLOCK_SIZE);
|
|
len = strlen(argv[2]);
|
|
buf[2] = '\0';
|
|
for (i = 0; i < EC_VBNV_BLOCK_SIZE; i++) {
|
|
if (i * 2 >= len)
|
|
break;
|
|
buf[0] = argv[2][i * 2];
|
|
if (i * 2 + 1 >= len)
|
|
buf[1] = '0';
|
|
else
|
|
buf[1] = argv[2][i * 2 + 1];
|
|
strict_strtoul(buf, 16, &result);
|
|
block[i] = result;
|
|
}
|
|
ret = cros_ec_write_vbnvcontext(dev, block);
|
|
}
|
|
if (ret) {
|
|
debug("%s: Could not %s VbNvContext\n", __func__,
|
|
argc <= 2 ? "read" : "write");
|
|
}
|
|
} else if (0 == strcmp("test", cmd)) {
|
|
int result = cros_ec_test(dev);
|
|
|
|
if (result)
|
|
printf("Test failed with error %d\n", result);
|
|
else
|
|
puts("Test passed\n");
|
|
} else if (0 == strcmp("version", cmd)) {
|
|
struct ec_response_get_version *p;
|
|
char *build_string;
|
|
|
|
ret = cros_ec_read_version(dev, &p);
|
|
if (!ret) {
|
|
/* Print versions */
|
|
printf("RO version: %1.*s\n",
|
|
sizeof(p->version_string_ro),
|
|
p->version_string_ro);
|
|
printf("RW version: %1.*s\n",
|
|
sizeof(p->version_string_rw),
|
|
p->version_string_rw);
|
|
printf("Firmware copy: %s\n",
|
|
(p->current_image <
|
|
ARRAY_SIZE(ec_current_image_name) ?
|
|
ec_current_image_name[p->current_image] :
|
|
"?"));
|
|
ret = cros_ec_read_build_info(dev, &build_string);
|
|
if (!ret)
|
|
printf("Build info: %s\n", build_string);
|
|
}
|
|
} else if (0 == strcmp("ldo", cmd)) {
|
|
uint8_t index, state;
|
|
char *endp;
|
|
|
|
if (argc < 3)
|
|
return CMD_RET_USAGE;
|
|
index = simple_strtoul(argv[2], &endp, 10);
|
|
if (*argv[2] == 0 || *endp != 0)
|
|
return CMD_RET_USAGE;
|
|
if (argc > 3) {
|
|
state = simple_strtoul(argv[3], &endp, 10);
|
|
if (*argv[3] == 0 || *endp != 0)
|
|
return CMD_RET_USAGE;
|
|
ret = cros_ec_set_ldo(dev, index, state);
|
|
} else {
|
|
ret = cros_ec_get_ldo(dev, index, &state);
|
|
if (!ret) {
|
|
printf("LDO%d: %s\n", index,
|
|
state == EC_LDO_STATE_ON ?
|
|
"on" : "off");
|
|
}
|
|
}
|
|
|
|
if (ret) {
|
|
debug("%s: Could not access LDO%d\n", __func__, index);
|
|
return ret;
|
|
}
|
|
} else {
|
|
return CMD_RET_USAGE;
|
|
}
|
|
|
|
if (ret < 0) {
|
|
printf("Error: CROS-EC command failed (error %d)\n", ret);
|
|
ret = 1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
U_BOOT_CMD(
|
|
crosec, 5, 1, do_cros_ec,
|
|
"CROS-EC utility command",
|
|
"init Re-init CROS-EC (done on startup automatically)\n"
|
|
"crosec id Read CROS-EC ID\n"
|
|
"crosec info Read CROS-EC info\n"
|
|
"crosec curimage Read CROS-EC current image\n"
|
|
"crosec hash Read CROS-EC hash\n"
|
|
"crosec reboot [rw | ro | cold] Reboot CROS-EC\n"
|
|
"crosec events Read CROS-EC host events\n"
|
|
"crosec clrevents [mask] Clear CROS-EC host events\n"
|
|
"crosec regioninfo <ro|rw> Read image info\n"
|
|
"crosec erase <ro|rw> Erase EC image\n"
|
|
"crosec read <ro|rw> <addr> [<size>] Read EC image\n"
|
|
"crosec write <ro|rw> <addr> [<size>] Write EC image\n"
|
|
"crosec vbnvcontext [hexstring] Read [write] VbNvContext from EC\n"
|
|
"crosec ldo <idx> [<state>] Switch/Read LDO state\n"
|
|
"crosec test run tests on cros_ec\n"
|
|
"crosec version Read CROS-EC version"
|
|
);
|
|
#endif
|