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cros: add cros_ec driver
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>
This commit is contained in:
Hung-ying Tyan
Tom Rini
parent
ca85eb8c42
commit
88364387c6
8 changed files with 3278 additions and 0 deletions
38
doc/device-tree-bindings/misc/cros-ec.txt
Normal file
38
doc/device-tree-bindings/misc/cros-ec.txt
Normal file
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@ -0,0 +1,38 @@
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Chrome OS CROS_EC Binding
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======================
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The device tree node which describes the operation of the CROS_EC interface
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is as follows:
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Required properties :
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- compatible = "google,cros-ec"
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Optional properties :
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- spi-max-frequency : Sets the maximum frequency (in Hz) for SPI bus
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operation
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- i2c-max-frequency : Sets the maximum frequency (in Hz) for I2C bus
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operation
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- ec-interrupt : Selects the EC interrupt, defined as a GPIO according
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to the platform
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- optimise-flash-write : Boolean property - if present then flash blocks
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containing all 0xff will not be written, since we assume that the EC
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uses that pattern for erased blocks
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The CROS_EC node should appear as a subnode of the interrupt that connects it
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to the EC (e.g. i2c, spi, lpc). The reg property (as usual) will indicate
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the unit address on that bus.
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Example
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=======
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spi@131b0000 {
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cros-ec@0 {
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reg = <0>;
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compatible = "google,cros-ec";
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spi-max-frequency = <5000000>;
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ec-interrupt = <&gpio 174 1>;
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optimise-flash-write;
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status = "disabled";
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};
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};
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@ -28,6 +28,7 @@ LIB := $(obj)libmisc.o
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COBJS-$(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_FSL_IIM) += fsl_iim.o
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COBJS-$(CONFIG_GPIO_LED) += gpio_led.o
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COBJS-$(CONFIG_FSL_MC9SDZ60) += mc9sdz60.o
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1304
drivers/misc/cros_ec.c
Normal file
1304
drivers/misc/cros_ec.c
Normal file
File diff suppressed because it is too large
Load diff
449
include/cros_ec.h
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449
include/cros_ec.h
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@ -0,0 +1,449 @@
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/*
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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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#ifndef _CROS_EC_H
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#define _CROS_EC_H
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#include <linux/compiler.h>
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#include <ec_commands.h>
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#include <fdtdec.h>
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#include <cros_ec_message.h>
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/* Which interface is the device on? */
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enum cros_ec_interface_t {
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CROS_EC_IF_NONE,
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CROS_EC_IF_SPI,
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CROS_EC_IF_I2C,
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CROS_EC_IF_LPC, /* Intel Low Pin Count interface */
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};
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/* Our configuration information */
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struct cros_ec_dev {
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enum cros_ec_interface_t interface;
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struct spi_slave *spi; /* Our SPI slave, if using SPI */
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int node; /* Our node */
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int parent_node; /* Our parent node (interface) */
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unsigned int cs; /* Our chip select */
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unsigned int addr; /* Device address (for I2C) */
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unsigned int bus_num; /* Bus number (for I2C) */
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unsigned int max_frequency; /* Maximum interface frequency */
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struct fdt_gpio_state ec_int; /* GPIO used as EC interrupt line */
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int cmd_version_is_supported; /* Device supports command versions */
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int optimise_flash_write; /* Don't write erased flash blocks */
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/*
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* These two buffers will always be dword-aligned and include enough
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* space for up to 7 word-alignment bytes also, so we can ensure that
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* the body of the message is always dword-aligned (64-bit).
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*
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* We use this alignment to keep ARM and x86 happy. Probably word
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* alignment would be OK, there might be a small performance advantage
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* to using dword.
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*/
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uint8_t din[ALIGN(MSG_BYTES + sizeof(int64_t), sizeof(int64_t))]
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__aligned(sizeof(int64_t));
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uint8_t dout[ALIGN(MSG_BYTES + sizeof(int64_t), sizeof(int64_t))]
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__aligned(sizeof(int64_t));
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};
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/*
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* Hard-code the number of columns we happen to know we have right now. It
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* would be more correct to call cros_ec_info() at startup and determine the
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* actual number of keyboard cols from there.
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*/
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#define CROS_EC_KEYSCAN_COLS 13
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/* Information returned by a key scan */
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struct mbkp_keyscan {
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uint8_t data[CROS_EC_KEYSCAN_COLS];
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};
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/**
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* Read the ID of the CROS-EC device
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*
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* The ID is a string identifying the CROS-EC device.
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*
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* @param dev CROS-EC device
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* @param id Place to put the ID
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* @param maxlen Maximum length of the ID field
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* @return 0 if ok, -1 on error
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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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* Read a keyboard scan from the CROS-EC device
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*
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* Send a message requesting a keyboard scan and return the result
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*
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* @param dev CROS-EC device
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* @param scan Place to put the scan results
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* @return 0 if ok, -1 on error
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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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* Read which image is currently running on the CROS-EC device.
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*
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* @param dev CROS-EC device
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* @param image Destination for image identifier
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* @return 0 if ok, <0 on error
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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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* Read the hash of the CROS-EC device firmware.
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*
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* @param dev CROS-EC device
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* @param hash Destination for hash information
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* @return 0 if ok, <0 on error
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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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* Send a reboot command to the CROS-EC device.
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*
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* Note that some reboot commands (such as EC_REBOOT_COLD) also reboot the AP.
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*
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* @param dev CROS-EC device
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* @param cmd Reboot command
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* @param flags Flags for reboot command (EC_REBOOT_FLAG_*)
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* @return 0 if ok, <0 on error
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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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* Check if the CROS-EC device has an interrupt pending.
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*
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* Read the status of the external interrupt connected to the CROS-EC device.
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* If no external interrupt is configured, this always returns 1.
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*
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* @param dev CROS-EC device
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* @return 0 if no interrupt is pending
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*/
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int cros_ec_interrupt_pending(struct cros_ec_dev *dev);
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enum {
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CROS_EC_OK,
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CROS_EC_ERR = 1,
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CROS_EC_ERR_FDT_DECODE,
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CROS_EC_ERR_CHECK_VERSION,
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CROS_EC_ERR_READ_ID,
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CROS_EC_ERR_DEV_INIT,
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};
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/**
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* Set up the Chromium OS matrix keyboard protocol
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*
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* @param blob Device tree blob containing setup information
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* @param cros_ecp Returns pointer to the cros_ec device, or NULL if none
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* @return 0 if we got an cros_ec device and all is well (or no cros_ec is
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* expected), -ve if we should have an cros_ec device but failed to find
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* one, or init failed (-CROS_EC_ERR_...).
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*/
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int cros_ec_init(const void *blob, struct cros_ec_dev **cros_ecp);
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/**
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* Read information about the keyboard matrix
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*
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* @param dev CROS-EC device
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* @param info Place to put the info structure
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*/
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int cros_ec_info(struct cros_ec_dev *dev,
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struct ec_response_cros_ec_info *info);
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/**
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* Read the host event flags
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*
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* @param dev CROS-EC device
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* @param events_ptr Destination for event flags. Not changed on error.
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* @return 0 if ok, <0 on error
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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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* Clear the specified host event flags
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*
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* @param dev CROS-EC device
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* @param events Event flags to clear
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* @return 0 if ok, <0 on error
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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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* Get/set flash protection
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*
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* @param dev CROS-EC device
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* @param set_mask Mask of flags to set; if 0, just retrieves existing
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* protection state without changing it.
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* @param set_flags New flag values; only bits in set_mask are applied;
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* ignored if set_mask=0.
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* @param prot Destination for updated protection state from EC.
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* @return 0 if ok, <0 on error
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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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* Run internal tests on the cros_ec interface.
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*
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* @param dev CROS-EC device
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* @return 0 if ok, <0 if the test failed
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*/
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int cros_ec_test(struct cros_ec_dev *dev);
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/**
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* Update the EC RW copy.
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*
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* @param dev CROS-EC device
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* @param image the content to write
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* @param imafge_size content length
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* @return 0 if ok, <0 if the test failed
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*/
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int cros_ec_flash_update_rw(struct cros_ec_dev *dev,
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const uint8_t *image, int image_size);
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/**
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* Return a pointer to the board's CROS-EC device
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*
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* This should be implemented by board files.
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*
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* @return pointer to CROS-EC device, or NULL if none is available
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*/
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struct cros_ec_dev *board_get_cros_ec_dev(void);
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/* Internal interfaces */
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int cros_ec_i2c_init(struct cros_ec_dev *dev, const void *blob);
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int cros_ec_spi_init(struct cros_ec_dev *dev, const void *blob);
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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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* Read information from the fdt for the i2c cros_ec interface
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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 if we failed to read all required information
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*/
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int cros_ec_i2c_decode_fdt(struct cros_ec_dev *dev, const void *blob);
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/**
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* Read information from the fdt for the spi cros_ec interface
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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 if we failed to read all required information
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*/
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int cros_ec_spi_decode_fdt(struct cros_ec_dev *dev, const void *blob);
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/**
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* Check whether the LPC interface supports new-style commands.
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*
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* LPC has its own way of doing this, which involves checking LPC values
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* visible to the host. Do this, and update dev->cmd_version_is_supported
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* accordingly.
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*
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* @param dev CROS-EC device to check
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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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* Send a command to an I2C CROS-EC device and return the reply.
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*
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* This rather complicated function deals with sending both old-style and
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* new-style commands. The old ones have just a command byte and arguments.
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* The new ones have version, command, arg-len, [args], chksum so are 3 bytes
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* longer.
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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 Returns 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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int cros_ec_i2c_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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* 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 Returns 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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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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int cros_ec_spi_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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* Dump a block of data for a command.
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*
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* @param name Name for data (e.g. 'in', 'out')
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* @param cmd Command number associated with data, or -1 for none
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* @param data Data block to dump
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* @param len Length of data block to dump
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*/
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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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* 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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* Decode a flash region parameter
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*
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* @param argc Number of params remaining
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* @param argv List of remaining parameters
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* @return flash region (EC_FLASH_REGION_...) or -1 on error
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*/
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int cros_ec_decode_region(int argc, char * const argv[]);
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int cros_ec_flash_erase(struct cros_ec_dev *dev, uint32_t offset,
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uint32_t size);
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/**
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* Read data from the flash
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*
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* Read an arbitrary amount of data from the EC flash, by repeatedly reading
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* small blocks.
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*
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* The offset starts at 0. You can obtain the region information from
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* cros_ec_flash_offset() to find out where to read for a particular region.
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*
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* @param dev CROS-EC device
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* @param data Pointer to data buffer to read into
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* @param offset Offset within flash to read from
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* @param size Number of bytes to read
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* @return 0 if ok, -1 on error
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*/
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int cros_ec_flash_read(struct cros_ec_dev *dev, uint8_t *data, uint32_t offset,
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uint32_t size);
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/**
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* Write data to the flash
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*
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* Write an arbitrary amount of data to the EC flash, by repeatedly writing
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* small blocks.
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*
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* The offset starts at 0. You can obtain the region information from
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* cros_ec_flash_offset() to find out where to write for a particular region.
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*
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* Attempting to write to the region where the EC is currently running from
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* will result in an error.
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*
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* @param dev CROS-EC device
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* @param data Pointer to data buffer to write
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* @param offset Offset within flash to write to.
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* @param size Number of bytes to write
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* @return 0 if ok, -1 on error
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*/
|
||||
int cros_ec_flash_write(struct cros_ec_dev *dev, const uint8_t *data,
|
||||
uint32_t offset, uint32_t size);
|
||||
|
||||
/**
|
||||
* Obtain position and size of a flash region
|
||||
*
|
||||
* @param dev CROS-EC device
|
||||
* @param region Flash region to query
|
||||
* @param offset Returns offset of flash region in EC flash
|
||||
* @param size Returns size of flash region
|
||||
* @return 0 if ok, -1 on error
|
||||
*/
|
||||
int cros_ec_flash_offset(struct cros_ec_dev *dev, enum ec_flash_region region,
|
||||
uint32_t *offset, uint32_t *size);
|
||||
|
||||
/**
|
||||
* Read/write VbNvContext from/to a CROS-EC device.
|
||||
*
|
||||
* @param dev CROS-EC device
|
||||
* @param block Buffer of VbNvContext to be read/write
|
||||
* @return 0 if ok, -1 on error
|
||||
*/
|
||||
int cros_ec_read_vbnvcontext(struct cros_ec_dev *dev, uint8_t *block);
|
||||
int cros_ec_write_vbnvcontext(struct cros_ec_dev *dev, const uint8_t *block);
|
||||
|
||||
/**
|
||||
* Read the version information for the EC images
|
||||
*
|
||||
* @param dev CROS-EC device
|
||||
* @param versionp This is set to point to the version information
|
||||
* @return 0 if ok, -1 on error
|
||||
*/
|
||||
int cros_ec_read_version(struct cros_ec_dev *dev,
|
||||
struct ec_response_get_version **versionp);
|
||||
|
||||
/**
|
||||
* Read the build information for the EC
|
||||
*
|
||||
* @param dev CROS-EC device
|
||||
* @param versionp This is set to point to the build string
|
||||
* @return 0 if ok, -1 on error
|
||||
*/
|
||||
int cros_ec_read_build_info(struct cros_ec_dev *dev, char **strp);
|
||||
|
||||
/**
|
||||
* Switch on/off a LDO / FET.
|
||||
*
|
||||
* @param dev CROS-EC device
|
||||
* @param index index of the LDO/FET to switch
|
||||
* @param state new state of the LDO/FET : EC_LDO_STATE_ON|OFF
|
||||
* @return 0 if ok, -1 on error
|
||||
*/
|
||||
int cros_ec_set_ldo(struct cros_ec_dev *dev, uint8_t index, uint8_t state);
|
||||
|
||||
/**
|
||||
* Read back a LDO / FET current state.
|
||||
*
|
||||
* @param dev CROS-EC device
|
||||
* @param index index of the LDO/FET to switch
|
||||
* @param state current state of the LDO/FET : EC_LDO_STATE_ON|OFF
|
||||
* @return 0 if ok, -1 on error
|
||||
*/
|
||||
int cros_ec_get_ldo(struct cros_ec_dev *dev, uint8_t index, uint8_t *state);
|
||||
#endif
|
||||
44
include/cros_ec_message.h
Normal file
44
include/cros_ec_message.h
Normal file
|
|
@ -0,0 +1,44 @@
|
|||
/*
|
||||
* Chromium OS Matrix Keyboard Message Protocol definitions
|
||||
*
|
||||
* 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
|
||||
*/
|
||||
|
||||
#ifndef _CROS_MESSAGE_H
|
||||
#define _CROS_MESSAGE_H
|
||||
|
||||
/*
|
||||
* Command interface between EC and AP, for LPC, I2C and SPI interfaces.
|
||||
*
|
||||
* This is copied from the Chromium OS Open Source Embedded Controller code.
|
||||
*/
|
||||
enum {
|
||||
/* The header byte, which follows the preamble */
|
||||
MSG_HEADER = 0xec,
|
||||
|
||||
MSG_HEADER_BYTES = 3,
|
||||
MSG_TRAILER_BYTES = 2,
|
||||
MSG_PROTO_BYTES = MSG_HEADER_BYTES + MSG_TRAILER_BYTES,
|
||||
|
||||
/* Max length of messages */
|
||||
MSG_BYTES = EC_HOST_PARAM_SIZE + MSG_PROTO_BYTES,
|
||||
};
|
||||
|
||||
#endif
|
||||
1440
include/ec_commands.h
Normal file
1440
include/ec_commands.h
Normal file
File diff suppressed because it is too large
Load diff
|
|
@ -84,6 +84,7 @@ enum fdt_compat_id {
|
|||
COMPAT_SAMSUNG_EXYNOS5_SOUND, /* Exynos Sound */
|
||||
COMPAT_WOLFSON_WM8994_CODEC, /* Wolfson WM8994 Sound Codec */
|
||||
COMPAT_SAMSUNG_EXYNOS_SPI, /* Exynos SPI */
|
||||
COMPAT_GOOGLE_CROS_EC, /* Google CROS_EC Protocol */
|
||||
COMPAT_SAMSUNG_EXYNOS_EHCI, /* Exynos EHCI controller */
|
||||
COMPAT_SAMSUNG_EXYNOS_USB_PHY, /* Exynos phy controller for usb2.0 */
|
||||
COMPAT_SAMSUNG_EXYNOS_TMU, /* Exynos TMU */
|
||||
|
|
|
|||
|
|
@ -57,6 +57,7 @@ static const char * const compat_names[COMPAT_COUNT] = {
|
|||
COMPAT(SAMSUNG_EXYNOS5_SOUND, "samsung,exynos-sound"),
|
||||
COMPAT(WOLFSON_WM8994_CODEC, "wolfson,wm8994-codec"),
|
||||
COMPAT(SAMSUNG_EXYNOS_SPI, "samsung,exynos-spi"),
|
||||
COMPAT(GOOGLE_CROS_EC, "google,cros-ec"),
|
||||
COMPAT(SAMSUNG_EXYNOS_EHCI, "samsung,exynos-ehci"),
|
||||
COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"),
|
||||
COMPAT(SAMSUNG_EXYNOS_TMU, "samsung,exynos-tmu"),
|
||||
|
|
|
|||
Loading…
Reference in a new issue