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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Chromium OS cros_ec driver
*
* Copyright (c) 2012 The Chromium OS Authors.
*/
#ifndef _CROS_EC_H
#define _CROS_EC_H
#include <linux/compiler.h>
#include <ec_commands.h>
#include <cros_ec_message.h>
#include <asm/gpio.h>
#include <dm/of_extra.h>
/* Our configuration information */
struct cros_ec_dev {
struct udevice *dev; /* Transport device */
struct gpio_desc ec_int; /* GPIO used as EC interrupt line */
int protocol_version; /* Protocol version to use */
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];
};
/* 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];
};
/**
* 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
*/
int cros_ec_read_id(struct udevice *dev, char *id, int maxlen);
/**
* 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
*/
int cros_ec_scan_keyboard(struct udevice *dev, struct mbkp_keyscan *scan);
/**
* Get the next pending MKBP event from the ChromeOS EC device.
*
* Send a message requesting the next event and return the result.
*
* @param event Place to put the event.
* Return: 0 if ok, <0 on error.
*/
int cros_ec_get_next_event(struct udevice *dev,
struct ec_response_get_next_event *event);
/**
* 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
*/
int cros_ec_read_current_image(struct udevice *dev,
enum ec_current_image *image);
/**
* Read the hash of the CROS-EC device firmware.
*
* @param dev CROS-EC device
* @param hash_offset Offset in flash to read from
* @param hash Destination for hash information
* Return: 0 if ok, <0 on error
*/
int cros_ec_read_hash(struct udevice *dev, uint hash_offset,
struct ec_response_vboot_hash *hash);
/**
* 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
*/
int cros_ec_reboot(struct udevice *dev, enum ec_reboot_cmd cmd, uint8_t flags);
/**
* 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
*/
int cros_ec_interrupt_pending(struct udevice *dev);
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,
};
/**
* Initialise the Chromium OS EC driver
*
* @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_...).
*/
int cros_ec_init(const void *blob, struct udevice**cros_ecp);
/**
* Read information about the keyboard matrix
*
* @param dev CROS-EC device
* @param info Place to put the info structure
*/
int cros_ec_info(struct udevice *dev, struct ec_response_mkbp_info *info);
/**
* 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
*/
int cros_ec_get_host_events(struct udevice *dev, uint32_t *events_ptr);
/**
* Clear the specified host event flags
*
* @param dev CROS-EC device
* @param events Event flags to clear
* Return: 0 if ok, <0 on error
*/
int cros_ec_clear_host_events(struct udevice *dev, uint32_t events);
/**
* 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
*/
int cros_ec_flash_protect(struct udevice *dev, uint32_t set_mask,
uint32_t set_flags,
struct ec_response_flash_protect *resp);
/**
* Run internal tests on the cros_ec interface.
*
* @param dev CROS-EC device
* Return: 0 if ok, <0 if the test failed
*/
int cros_ec_test(struct udevice *dev);
/**
* 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
*/
int cros_ec_flash_update_rw(struct udevice *dev, const uint8_t *image,
int image_size);
/**
* Return a pointer to the board's CROS-EC device
*
* Return: pointer to CROS-EC device, or NULL if none is available
*/
struct udevice *board_get_cros_ec_dev(void);
struct dm_cros_ec_ops {
/**
* check_version() - Check the protocol version being used (optional)
*
* If provided, this function should check that the EC can be supported
* by the driver. If not provided, HELLO messages will be sent to try
* to determine the protocol version.
*
* @dev: Device to check
* @return 0 if the protocol is valid, -ve if not supported
*/
int (*check_version)(struct udevice *dev);
/**
* command() - Old-style command interface
*
* This sends a command and receives a response (deprecated, use
* packet())
*
* @dev: Device to use
* @cmd: Command to send (only supports 0-0xff)
* @cmd_version: Version of command to send (often 0)
* @dout: Output data (may be NULL If dout_len=0)
* @dout_len: Length of output data excluding 4-byte header
* @dinp: On input, set to point to input data, often struct
* cros_ec_dev->din - typically this is left alone but may be
* updated by the driver
* @din_len: Maximum length of response
* @return number of bytes in response, or -ve on error
*/
int (*command)(struct udevice *dev, uint8_t cmd, int cmd_version,
const uint8_t *dout, int dout_len,
uint8_t **dinp, int din_len);
/**
* packet() - New-style command interface
*
* This interface is preferred over command(), since it is typically
* easier to implement.
*
* @dev: Device to use
* @out_bytes: Number of bytes to send (from struct cros_ec_dev->dout)
* @in_bytes: Maximum number of bytes to expect in response
* @return number of bytes in response, or -ve on error
*/
int (*packet)(struct udevice *dev, int out_bytes, int in_bytes);
/**
* get_switches() - Get value of EC switches
*
* This is currently supported on the LPC EC.
*
* @dev: Device to use
* @return current switches value, or -ENOSYS if not supported
*/
int (*get_switches)(struct udevice *dev);
};
#define dm_cros_ec_get_ops(dev) \
((struct dm_cros_ec_ops *)(dev)->driver->ops)
int cros_ec_register(struct udevice *dev);
/**
* 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);
int cros_ec_flash_erase(struct udevice *dev, uint32_t offset, uint32_t size);
/**
* 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
*/
int cros_ec_flash_read(struct udevice *dev, uint8_t *data, uint32_t offset,
uint32_t size);
/**
* 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
*/
int cros_ec_read_flashinfo(struct udevice *dev,
struct ec_response_flash_info *info);
/**
* 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
*/
int cros_ec_flash_write(struct udevice *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 udevice *dev, enum ec_flash_region region,
uint32_t *offset, uint32_t *size);
/**
* cros_ec_get_sku_id() - Read the SKU ID
*
* @dev: CROS-EC device
* return SKU ID, or -ve on error
*/
int cros_ec_get_sku_id(struct udevice *dev);
/**
* Read/write non-volatile data 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_nvdata(struct udevice *dev, uint8_t *block, int size);
int cros_ec_write_nvdata(struct udevice *dev, const uint8_t *block, int size);
/**
* 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 udevice *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 udevice *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 udevice *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 udevice *dev, uint8_t index, uint8_t *state);
/**
* 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);
/**
* Returns information from the FDT about the Chrome EC flash
*
* @param dev Device to read from
* @param config Structure to use to return information
*/
int cros_ec_decode_ec_flash(struct udevice *dev, struct fdt_cros_ec *config);
/**
* Check the current keyboard state, in case recovery mode is requested.
* This function is for sandbox only.
*
* @param ec CROS-EC device
*/
void cros_ec_check_keyboard(struct udevice *dev);
struct i2c_msg;
/*
* Tunnel an I2C transfer to the EC
*
* @param dev CROS-EC device
* @param port The remote port on EC to use
* @param msg List of messages to transfer
* @param nmsgs Number of messages to transfer
*/
int cros_ec_i2c_tunnel(struct udevice *dev, int port, struct i2c_msg *msg,
int nmsgs);
/**
* 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_set_pwm_duty() - Set duty cycle of a generic pwm
*
* Note that duty value needs to be passed to the EC as a 16 bit number
* for increased precision.
*
* @param dev CROS-EC device
* @param index Index of the pwm
* @param duty Desired duty cycle, in 0..EC_PWM_MAX_DUTY range.
* Return: 0 if OK, -ve on error
*/
int cros_ec_set_pwm_duty(struct udevice *dev, uint8_t index, uint16_t duty);
/**
* 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);
/**
* cros_ec_hello() - Send a hello message
*
* Sends a message with a fixed input value and checks that the expected output
* value is received
*
* @dev: CROS-EC device
* @handshakep: If non-NULL, returns received handshake value on error
* Return: 0 if OK, -ve on error
*/
int cros_ec_hello(struct udevice *dev, uint *handshakep);
/**
* cros_ec_get_features() - Get the set of features provided by the EC
*
* See enum ec_feature_code for the list of available features
*
* @dev: CROS-EC device
* @featuresp: Returns a bitmask of supported features
* Return: 0 if OK, -ve on error
*/
int cros_ec_get_features(struct udevice *dev, u64 *featuresp);
/**
* cros_ec_check_feature() - Check if a feature is supported
*
* @dev: CROS-EC device
* @feature: Feature number to check (enum ec_feature_code)
* Return: true if supported, false if not, -ve on error
*/
int cros_ec_check_feature(struct udevice *dev, uint feature);
/**
* cros_ec_get_switches() - Get switches value
*
* @dev: CROS-EC device
* Return: switches value, or -ENOSYS if not supported, or other -ve value on
* other error
*/
int cros_ec_get_switches(struct udevice *dev);
/**
* cros_ec_vstore_supported() - Check if vstore is supported
*
* @dev: CROS-EC device
* Return: false if not supported, true if supported, -ve on error
*/
int cros_ec_vstore_supported(struct udevice *dev);
/**
* cros_ec_vstore_info() - Get vstore information
*
* @dev: CROS-EC device
* @lockedp: mask of locked slots
* Return: number of vstore slots supported by the EC,, -ve on error
*/
int cros_ec_vstore_info(struct udevice *dev, u32 *lockedp);
/**
* cros_ec_vstore_read() - Read data from EC vstore slot
*
* @dev: CROS-EC device
* @slot: vstore slot to read from
* @data: buffer to store read data, must be EC_VSTORE_SLOT_SIZE bytes
* Return: 0 if OK, -ve on error
*/
int cros_ec_vstore_read(struct udevice *dev, int slot, uint8_t *data);
/**
* cros_ec_vstore_write() - Save data into EC vstore slot
*
* The maximum size of data is EC_VSTORE_SLOT_SIZE. It is the caller's
* responsibility to check the number of implemented slots by querying the
* vstore info.
*
* @dev: CROS-EC device
* @slot: vstore slot to write into
* @data: data to write
* @size: size of data in bytes
* Return: 0 if OK, -ve on error
*/
int cros_ec_vstore_write(struct udevice *dev, int slot, const uint8_t *data,
size_t size);
/**
* cros_ec_read_batt_charge() - Read the battery-charge state
*
* @dev: CROS-EC device
* @chargep: Return battery-charge state as a percentage
*/
int cros_ec_read_batt_charge(struct udevice *dev, uint *chargep);
#endif