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include/cros_ec.h
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/* SPDX-License-Identifier: GPL-2.0+ */ |
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/* * Chromium OS cros_ec driver * * Copyright (c) 2012 The Chromium OS Authors. |
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*/ #ifndef _CROS_EC_H #define _CROS_EC_H #include <linux/compiler.h> #include <ec_commands.h> |
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#include <cros_ec_message.h> |
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#include <asm/gpio.h> |
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#include <dm/of_extra.h> |
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/* Our configuration information */ struct cros_ec_dev { |
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struct udevice *dev; /* Transport device */ |
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struct gpio_desc ec_int; /* GPIO used as EC interrupt line */ |
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int protocol_version; /* Protocol version to use */ |
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int optimise_flash_write; /* Don't write erased flash blocks */ /* * These two buffers will always be dword-aligned and include enough * space for up to 7 word-alignment bytes also, so we can ensure that * the body of the message is always dword-aligned (64-bit). * * We use this alignment to keep ARM and x86 happy. Probably word * alignment would be OK, there might be a small performance advantage * to using dword. */ uint8_t din[ALIGN(MSG_BYTES + sizeof(int64_t), sizeof(int64_t))] __aligned(sizeof(int64_t)); uint8_t dout[ALIGN(MSG_BYTES + sizeof(int64_t), sizeof(int64_t))] __aligned(sizeof(int64_t)); }; /* * Hard-code the number of columns we happen to know we have right now. It * would be more correct to call cros_ec_info() at startup and determine the * actual number of keyboard cols from there. */ #define CROS_EC_KEYSCAN_COLS 13 /* Information returned by a key scan */ struct mbkp_keyscan { uint8_t data[CROS_EC_KEYSCAN_COLS]; }; |
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/* Holds information about the Chrome EC */ struct fdt_cros_ec { struct fmap_entry flash; /* Address and size of EC flash */ /* * Byte value of erased flash, or -1 if not known. It is normally * 0xff but some flash devices use 0 (e.g. STM32Lxxx) */ int flash_erase_value; struct fmap_entry region[EC_FLASH_REGION_COUNT]; }; |
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/** * Read the ID of the CROS-EC device * * The ID is a string identifying the CROS-EC device. * * @param dev CROS-EC device * @param id Place to put the ID * @param maxlen Maximum length of the ID field * @return 0 if ok, -1 on error */ |
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int cros_ec_read_id(struct udevice *dev, char *id, int maxlen); |
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/** * Read a keyboard scan from the CROS-EC device * * Send a message requesting a keyboard scan and return the result * * @param dev CROS-EC device * @param scan Place to put the scan results * @return 0 if ok, -1 on error */ |
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int cros_ec_scan_keyboard(struct udevice *dev, struct mbkp_keyscan *scan); |
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/** * Read which image is currently running on the CROS-EC device. * * @param dev CROS-EC device * @param image Destination for image identifier * @return 0 if ok, <0 on error */ |
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int cros_ec_read_current_image(struct udevice *dev, enum ec_current_image *image); |
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/** * Read the hash of the CROS-EC device firmware. * * @param dev CROS-EC device |
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* @param hash_offset Offset in flash to read from |
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* @param hash Destination for hash information * @return 0 if ok, <0 on error */ |
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int cros_ec_read_hash(struct udevice *dev, uint hash_offset, struct ec_response_vboot_hash *hash); |
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/** * Send a reboot command to the CROS-EC device. * * Note that some reboot commands (such as EC_REBOOT_COLD) also reboot the AP. * * @param dev CROS-EC device * @param cmd Reboot command * @param flags Flags for reboot command (EC_REBOOT_FLAG_*) * @return 0 if ok, <0 on error */ |
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int cros_ec_reboot(struct udevice *dev, enum ec_reboot_cmd cmd, uint8_t flags); |
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/** * Check if the CROS-EC device has an interrupt pending. * * Read the status of the external interrupt connected to the CROS-EC device. * If no external interrupt is configured, this always returns 1. * * @param dev CROS-EC device * @return 0 if no interrupt is pending */ |
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int cros_ec_interrupt_pending(struct udevice *dev); |
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enum { CROS_EC_OK, CROS_EC_ERR = 1, CROS_EC_ERR_FDT_DECODE, CROS_EC_ERR_CHECK_VERSION, CROS_EC_ERR_READ_ID, CROS_EC_ERR_DEV_INIT, }; /** |
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* Initialise the Chromium OS EC driver |
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* * @param blob Device tree blob containing setup information * @param cros_ecp Returns pointer to the cros_ec device, or NULL if none * @return 0 if we got an cros_ec device and all is well (or no cros_ec is * expected), -ve if we should have an cros_ec device but failed to find * one, or init failed (-CROS_EC_ERR_...). */ |
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int cros_ec_init(const void *blob, struct udevice**cros_ecp); |
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/** * Read information about the keyboard matrix * * @param dev CROS-EC device * @param info Place to put the info structure */ |
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int cros_ec_info(struct udevice *dev, struct ec_response_mkbp_info *info); |
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/** * Read the host event flags * * @param dev CROS-EC device * @param events_ptr Destination for event flags. Not changed on error. * @return 0 if ok, <0 on error */ |
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int cros_ec_get_host_events(struct udevice *dev, uint32_t *events_ptr); |
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/** * Clear the specified host event flags * * @param dev CROS-EC device * @param events Event flags to clear * @return 0 if ok, <0 on error */ |
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int cros_ec_clear_host_events(struct udevice *dev, uint32_t events); |
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/** * Get/set flash protection * * @param dev CROS-EC device * @param set_mask Mask of flags to set; if 0, just retrieves existing * protection state without changing it. * @param set_flags New flag values; only bits in set_mask are applied; * ignored if set_mask=0. * @param prot Destination for updated protection state from EC. * @return 0 if ok, <0 on error */ |
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int cros_ec_flash_protect(struct udevice *dev, uint32_t set_mask, uint32_t set_flags, struct ec_response_flash_protect *resp); |
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/** * Notify EC of current boot mode * * @param dev CROS-EC device * @param vboot_mode Verified boot mode * @return 0 if ok, <0 on error */ int cros_ec_entering_mode(struct udevice *dev, int mode); |
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/** * Run internal tests on the cros_ec interface. * * @param dev CROS-EC device * @return 0 if ok, <0 if the test failed */ |
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int cros_ec_test(struct udevice *dev); |
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/** * Update the EC RW copy. * * @param dev CROS-EC device * @param image the content to write * @param imafge_size content length * @return 0 if ok, <0 if the test failed */ |
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int cros_ec_flash_update_rw(struct udevice *dev, const uint8_t *image, int image_size); |
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/** * Return a pointer to the board's CROS-EC device * |
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* @return pointer to CROS-EC device, or NULL if none is available */ |
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struct udevice *board_get_cros_ec_dev(void); |
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struct dm_cros_ec_ops { int (*check_version)(struct udevice *dev); int (*command)(struct udevice *dev, uint8_t cmd, int cmd_version, const uint8_t *dout, int dout_len, uint8_t **dinp, int din_len); int (*packet)(struct udevice *dev, int out_bytes, int in_bytes); }; #define dm_cros_ec_get_ops(dev) \ ((struct dm_cros_ec_ops *)(dev)->driver->ops) int cros_ec_register(struct udevice *dev); |
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/** |
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* Dump a block of data for a command. * * @param name Name for data (e.g. 'in', 'out') * @param cmd Command number associated with data, or -1 for none * @param data Data block to dump * @param len Length of data block to dump */ void cros_ec_dump_data(const char *name, int cmd, const uint8_t *data, int len); /** * Calculate a simple 8-bit checksum of a data block * * @param data Data block to checksum * @param size Size of data block in bytes * @return checksum value (0 to 255) */ int cros_ec_calc_checksum(const uint8_t *data, int size); |
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int cros_ec_flash_erase(struct udevice *dev, uint32_t offset, uint32_t size); |
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/** * Read data from the flash * * Read an arbitrary amount of data from the EC flash, by repeatedly reading * small blocks. * * 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 */ |
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int cros_ec_flash_read(struct udevice *dev, uint8_t *data, uint32_t offset, uint32_t size); |
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/** |
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* Read back flash parameters * * This function reads back parameters of the flash as reported by the EC * * @param dev Pointer to device * @param info Pointer to output flash info struct */ |
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int cros_ec_read_flashinfo(struct udevice *dev, struct ec_response_flash_info *info); |
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/** |
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* Write data to the flash * * Write an arbitrary amount of data to the EC flash, by repeatedly writing * small blocks. * * 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 */ |
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int cros_ec_flash_write(struct udevice *dev, const uint8_t *data, uint32_t offset, uint32_t size); |
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/** * 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 */ |
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int cros_ec_flash_offset(struct udevice *dev, enum ec_flash_region region, uint32_t *offset, uint32_t *size); |
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/** |
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* Read/write non-volatile data from/to a CROS-EC device. |
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* * @param dev CROS-EC device * @param block Buffer of VbNvContext to be read/write * @return 0 if ok, -1 on error */ |
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int cros_ec_read_nvdata(struct udevice *dev, uint8_t *block, int size); int cros_ec_write_nvdata(struct udevice *dev, const uint8_t *block, int size); |
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/** * 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 */ |
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int cros_ec_read_version(struct udevice *dev, struct ec_response_get_version **versionp); |
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/** * 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 */ |
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int cros_ec_read_build_info(struct udevice *dev, char **strp); |
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/** * 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 */ |
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int cros_ec_set_ldo(struct udevice *dev, uint8_t index, uint8_t state); |
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/** * 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 */ |
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int cros_ec_get_ldo(struct udevice *dev, uint8_t index, uint8_t *state); |
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/** |
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* Get access to the error reported when cros_ec_board_init() was called * * This permits delayed reporting of the EC error if it failed during * early init. * * @return error (0 if there was no error, -ve if there was an error) */ int cros_ec_get_error(void); |
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/** * Returns information from the FDT about the Chrome EC flash * |
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* @param dev Device to read from |
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* @param config Structure to use to return information */ |
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int cros_ec_decode_ec_flash(struct udevice *dev, struct fdt_cros_ec *config); |
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/** * Check the current keyboard state, in case recovery mode is requested. * This function is for sandbox only. * * @param ec CROS-EC device */ |
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void cros_ec_check_keyboard(struct udevice *dev); |
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struct i2c_msg; /* * Tunnel an I2C transfer to the EC * * @param dev CROS-EC device |
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* @param port The remote port on EC to use |
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* @param msg List of messages to transfer * @param nmsgs Number of messages to transfer */ |
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int cros_ec_i2c_tunnel(struct udevice *dev, int port, struct i2c_msg *msg, int nmsgs); |
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/** * cros_ec_get_events_b() - Get event mask B * * @return value of event mask, default value of 0 if it could not be read */ uint64_t cros_ec_get_events_b(struct udevice *dev); /** * cros_ec_clear_events_b() - Clear even mask B * * Any pending events in the B range are cleared * * @return 0 if OK, -ve on error */ int cros_ec_clear_events_b(struct udevice *dev, uint64_t mask); /** * cros_ec_efs_verify() - tell the EC to verify one of its images * * @param dev CROS-EC device * @param region Flash region to query * @return 0 if OK, -ve on error */ int cros_ec_efs_verify(struct udevice *dev, enum ec_flash_region region); /** * cros_ec_battery_cutoff() - Request that the battery be cut off * * This tells the battery to stop supplying power. This is used before shipping * a device to ensure that the battery remains charged while the device is * shipped or sitting on the shelf waiting to be purchased. * * @param dev CROS-EC device * @param flags Flags to use (EC_BATTERY_CUTOFF_FLAG_...) * @return 0 if OK, -ve on error */ int cros_ec_battery_cutoff(struct udevice *dev, uint8_t flags); /** * cros_ec_read_limit_power() - Check if power is limited by batter/charger * * Sometimes the battery is low and / or the device is connected to a charger * that cannot supply much power. * * @param dev CROS-EC device * @param limit_powerp Returns whether power is limited (0 or 1) * @return 0 if OK, -ENOSYS if the EC does not support this comment, -EINVAL * if the EC returned an invalid response */ int cros_ec_read_limit_power(struct udevice *dev, int *limit_powerp); /** * cros_ec_config_powerbtn() - Configure the behaviour of the power button * * @param dev CROS-EC device * @param flags Flags to use (EC_POWER_BUTTON_...) * @return 0 if OK, -ve on error */ int cros_ec_config_powerbtn(struct udevice *dev, uint32_t flags); /** * cros_ec_get_lid_shutdown_mask() - Set the lid shutdown mask * * Determines whether a lid close event is reported * * @param dev CROS-EC device * @return shufdown mas if OK, -ve on error */ int cros_ec_get_lid_shutdown_mask(struct udevice *dev); /** * cros_ec_set_lid_shutdown_mask() - Set the lid shutdown mask * * Set whether a lid close event is reported * * @param dev CROS-EC device * @param enable true to enable reporting, false to disable * @return shufdown mas if OK, -ve on error */ int cros_ec_set_lid_shutdown_mask(struct udevice *dev, int enable); |
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#endif |