diff options
| -rw-r--r-- | drivers/misc/cros_ec.c | 33 | ||||
| -rw-r--r-- | include/cros_ec.h | 4 | ||||
| -rw-r--r-- | include/cros_ec_message.h | 2 | ||||
| -rw-r--r-- | include/ec_commands.h | 344 |
4 files changed, 321 insertions, 62 deletions
diff --git a/drivers/misc/cros_ec.c b/drivers/misc/cros_ec.c index 1cb879c..ff46762 100644 --- a/drivers/misc/cros_ec.c +++ b/drivers/misc/cros_ec.c @@ -7,10 +7,11 @@ */ /* - * The Matrix Keyboard Protocol driver handles talking to the keyboard - * controller chip. Mostly this is for keyboard functions, but some other - * things have slipped in, so we provide generic services to talk to the - * KBC. + * This is the interface to the Chrome OS EC. It provides keyboard functions, + * power control and battery management. Quite a few other functions are + * provided to enable the EC software to be updated, talk to the EC's I2C bus + * and store a small amount of data in a memory which persists while the EC + * is not reset. */ #include <common.h> @@ -216,7 +217,7 @@ static int ec_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version, int cros_ec_scan_keyboard(struct cros_ec_dev *dev, struct mbkp_keyscan *scan) { - if (ec_command(dev, EC_CMD_CROS_EC_STATE, 0, NULL, 0, scan, + if (ec_command(dev, EC_CMD_MKBP_STATE, 0, NULL, 0, scan, sizeof(scan->data)) < sizeof(scan->data)) return -1; @@ -263,7 +264,7 @@ int cros_ec_read_version(struct cros_ec_dev *dev, int cros_ec_read_build_info(struct cros_ec_dev *dev, char **strp) { if (ec_command_inptr(dev, EC_CMD_GET_BUILD_INFO, 0, NULL, 0, - (uint8_t **)strp, EC_HOST_PARAM_SIZE) < 0) + (uint8_t **)strp, EC_PROTO2_MAX_PARAM_SIZE) < 0) return -1; return 0; @@ -332,7 +333,7 @@ int cros_ec_read_hash(struct cros_ec_dev *dev, debug("%s: No valid hash (status=%d size=%d). Compute one...\n", __func__, hash->status, hash->size); - p.cmd = EC_VBOOT_HASH_RECALC; + p.cmd = EC_VBOOT_HASH_START; p.hash_type = EC_VBOOT_HASH_TYPE_SHA256; p.nonce_size = 0; p.offset = EC_VBOOT_HASH_OFFSET_RW; @@ -414,10 +415,10 @@ int cros_ec_interrupt_pending(struct cros_ec_dev *dev) return !gpio_get_value(dev->ec_int.gpio); } -int cros_ec_info(struct cros_ec_dev *dev, struct ec_response_cros_ec_info *info) +int cros_ec_info(struct cros_ec_dev *dev, struct ec_response_mkbp_info *info) { - if (ec_command(dev, EC_CMD_CROS_EC_INFO, 0, NULL, 0, info, - sizeof(*info)) < sizeof(*info)) + if (ec_command(dev, EC_CMD_MKBP_INFO, 0, NULL, 0, info, + sizeof(*info)) < sizeof(*info)) return -1; return 0; @@ -590,8 +591,8 @@ static int cros_ec_flash_write_block(struct cros_ec_dev *dev, p.offset = offset; p.size = size; - assert(data && p.size <= sizeof(p.data)); - memcpy(p.data, data, p.size); + assert(data && p.size <= EC_FLASH_WRITE_VER0_SIZE); + memcpy(&p + 1, data, p.size); return ec_command_inptr(dev, EC_CMD_FLASH_WRITE, 0, &p, sizeof(p), NULL, 0) >= 0 ? 0 : -1; @@ -602,8 +603,7 @@ static int cros_ec_flash_write_block(struct cros_ec_dev *dev, */ static int cros_ec_flash_write_burst_size(struct cros_ec_dev *dev) { - struct ec_params_flash_write p; - return sizeof(p.data); + return EC_FLASH_WRITE_VER0_SIZE; } /** @@ -804,7 +804,8 @@ int cros_ec_get_ldo(struct cros_ec_dev *dev, uint8_t index, uint8_t *state) } /** - * Decode MBKP details from the device tree and allocate a suitable device. + * Decode EC interface details from the device tree and allocate a suitable + * device. * * @param blob Device tree blob * @param node Node to decode from @@ -1086,7 +1087,7 @@ static int do_cros_ec(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) } printf("%s\n", id); } else if (0 == strcmp("info", cmd)) { - struct ec_response_cros_ec_info info; + struct ec_response_mkbp_info info; if (cros_ec_info(dev, &info)) { debug("%s: Could not read KBC info\n", __func__); diff --git a/include/cros_ec.h b/include/cros_ec.h index 999c3c9..3166132 100644 --- a/include/cros_ec.h +++ b/include/cros_ec.h @@ -151,7 +151,7 @@ enum { }; /** - * Set up the Chromium OS matrix keyboard protocol + * 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 @@ -168,7 +168,7 @@ int cros_ec_init(const void *blob, struct cros_ec_dev **cros_ecp); * @param info Place to put the info structure */ int cros_ec_info(struct cros_ec_dev *dev, - struct ec_response_cros_ec_info *info); + struct ec_response_mkbp_info *info); /** * Read the host event flags diff --git a/include/cros_ec_message.h b/include/cros_ec_message.h index b1da53d..36e2d83 100644 --- a/include/cros_ec_message.h +++ b/include/cros_ec_message.h @@ -23,7 +23,7 @@ enum { MSG_PROTO_BYTES = MSG_HEADER_BYTES + MSG_TRAILER_BYTES, /* Max length of messages */ - MSG_BYTES = EC_HOST_PARAM_SIZE + MSG_PROTO_BYTES, + MSG_BYTES = EC_PROTO2_MAX_PARAM_SIZE + MSG_PROTO_BYTES, }; #endif diff --git a/include/ec_commands.h b/include/ec_commands.h index d9c8c1f..78baab1 100644 --- a/include/ec_commands.h +++ b/include/ec_commands.h @@ -1,4 +1,4 @@ -/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved. +/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved. * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ @@ -42,13 +42,19 @@ #define EC_LPC_ADDR_HOST_CMD 0x204 /* I/O addresses for host command args and params */ -#define EC_LPC_ADDR_HOST_ARGS 0x800 -#define EC_LPC_ADDR_HOST_PARAM 0x804 -#define EC_HOST_PARAM_SIZE 0x0fc /* Size of param area in bytes */ - -/* I/O addresses for host command params, old interface */ -#define EC_LPC_ADDR_OLD_PARAM 0x880 -#define EC_OLD_PARAM_SIZE 0x080 /* Size of param area in bytes */ +/* Protocol version 2 */ +#define EC_LPC_ADDR_HOST_ARGS 0x800 /* And 0x801, 0x802, 0x803 */ +#define EC_LPC_ADDR_HOST_PARAM 0x804 /* For version 2 params; size is + * EC_PROTO2_MAX_PARAM_SIZE */ +/* Protocol version 3 */ +#define EC_LPC_ADDR_HOST_PACKET 0x800 /* Offset of version 3 packet */ +#define EC_LPC_HOST_PACKET_SIZE 0x100 /* Max size of version 3 packet */ + +/* The actual block is 0x800-0x8ff, but some BIOSes think it's 0x880-0x8ff + * and they tell the kernel that so we have to think of it as two parts. */ +#define EC_HOST_CMD_REGION0 0x800 +#define EC_HOST_CMD_REGION1 0x880 +#define EC_HOST_CMD_REGION_SIZE 0x80 /* EC command register bit functions */ #define EC_LPC_CMDR_DATA (1 << 0) /* Data ready for host to read */ @@ -122,8 +128,8 @@ #define EC_SWITCH_LID_OPEN 0x01 #define EC_SWITCH_POWER_BUTTON_PRESSED 0x02 #define EC_SWITCH_WRITE_PROTECT_DISABLED 0x04 -/* Recovery requested via keyboard */ -#define EC_SWITCH_KEYBOARD_RECOVERY 0x08 +/* Was recovery requested via keyboard; now unused. */ +#define EC_SWITCH_IGNORE1 0x08 /* Recovery requested via dedicated signal (from servo board) */ #define EC_SWITCH_DEDICATED_RECOVERY 0x10 /* Was fake developer mode switch; now unused. Remove in next refactor. */ @@ -132,10 +138,13 @@ /* Host command interface flags */ /* Host command interface supports LPC args (LPC interface only) */ #define EC_HOST_CMD_FLAG_LPC_ARGS_SUPPORTED 0x01 +/* Host command interface supports version 3 protocol */ +#define EC_HOST_CMD_FLAG_VERSION_3 0x02 /* Wireless switch flags */ #define EC_WIRELESS_SWITCH_WLAN 0x01 #define EC_WIRELESS_SWITCH_BLUETOOTH 0x02 +#define EC_WIRELESS_SWITCH_WWAN 0x04 /* * This header file is used in coreboot both in C and ACPI code. The ACPI code @@ -191,6 +200,9 @@ enum ec_status { EC_RES_UNAVAILABLE = 9, /* No response available */ EC_RES_TIMEOUT = 10, /* We got a timeout */ EC_RES_OVERFLOW = 11, /* Table / data overflow */ + EC_RES_INVALID_HEADER = 12, /* Header contains invalid data */ + EC_RES_REQUEST_TRUNCATED = 13, /* Didn't get the entire request */ + EC_RES_RESPONSE_TOO_BIG = 14 /* Response was too big to handle */ }; /* @@ -272,6 +284,105 @@ struct ec_lpc_host_args { */ #define EC_HOST_ARGS_FLAG_TO_HOST 0x02 +/*****************************************************************************/ + +/* + * Protocol version 2 for I2C and SPI send a request this way: + * + * 0 EC_CMD_VERSION0 + (command version) + * 1 Command number + * 2 Length of params = N + * 3..N+2 Params, if any + * N+3 8-bit checksum of bytes 0..N+2 + * + * The corresponding response is: + * + * 0 Result code (EC_RES_*) + * 1 Length of params = M + * 2..M+1 Params, if any + * M+2 8-bit checksum of bytes 0..M+1 + */ +#define EC_PROTO2_REQUEST_HEADER_BYTES 3 +#define EC_PROTO2_REQUEST_TRAILER_BYTES 1 +#define EC_PROTO2_REQUEST_OVERHEAD (EC_PROTO2_REQUEST_HEADER_BYTES + \ + EC_PROTO2_REQUEST_TRAILER_BYTES) + +#define EC_PROTO2_RESPONSE_HEADER_BYTES 2 +#define EC_PROTO2_RESPONSE_TRAILER_BYTES 1 +#define EC_PROTO2_RESPONSE_OVERHEAD (EC_PROTO2_RESPONSE_HEADER_BYTES + \ + EC_PROTO2_RESPONSE_TRAILER_BYTES) + +/* Parameter length was limited by the LPC interface */ +#define EC_PROTO2_MAX_PARAM_SIZE 0xfc + +/* Maximum request and response packet sizes for protocol version 2 */ +#define EC_PROTO2_MAX_REQUEST_SIZE (EC_PROTO2_REQUEST_OVERHEAD + \ + EC_PROTO2_MAX_PARAM_SIZE) +#define EC_PROTO2_MAX_RESPONSE_SIZE (EC_PROTO2_RESPONSE_OVERHEAD + \ + EC_PROTO2_MAX_PARAM_SIZE) + +/*****************************************************************************/ + +/* + * Value written to legacy command port / prefix byte to indicate protocol + * 3+ structs are being used. Usage is bus-dependent. + */ +#define EC_COMMAND_PROTOCOL_3 0xda + +#define EC_HOST_REQUEST_VERSION 3 + +/* Version 3 request from host */ +struct ec_host_request { + /* Struct version (=3) + * + * EC will return EC_RES_INVALID_HEADER if it receives a header with a + * version it doesn't know how to parse. + */ + uint8_t struct_version; + + /* + * Checksum of request and data; sum of all bytes including checksum + * should total to 0. + */ + uint8_t checksum; + + /* Command code */ + uint16_t command; + + /* Command version */ + uint8_t command_version; + + /* Unused byte in current protocol version; set to 0 */ + uint8_t reserved; + + /* Length of data which follows this header */ + uint16_t data_len; +} __packed; + +#define EC_HOST_RESPONSE_VERSION 3 + +/* Version 3 response from EC */ +struct ec_host_response { + /* Struct version (=3) */ + uint8_t struct_version; + + /* + * Checksum of response and data; sum of all bytes including checksum + * should total to 0. + */ + uint8_t checksum; + + /* Result code (EC_RES_*) */ + uint16_t result; + + /* Length of data which follows this header */ + uint16_t data_len; + + /* Unused bytes in current protocol version; set to 0 */ + uint16_t reserved; +} __packed; + +/*****************************************************************************/ /* * Notes on commands: * @@ -411,6 +522,46 @@ struct ec_response_get_comms_status { uint32_t flags; /* Mask of enum ec_comms_status */ } __packed; +/* + * Fake a variety of responses, purely for testing purposes. + * FIXME: Would be nice to force checksum errors. + */ +#define EC_CMD_TEST_PROTOCOL 0x0a + +/* Tell the EC what to send back to us. */ +struct ec_params_test_protocol { + uint32_t ec_result; + uint32_t ret_len; + uint8_t buf[32]; +} __packed; + +/* Here it comes... */ +struct ec_response_test_protocol { + uint8_t buf[32]; +} __packed; + +/* Get prococol information */ +#define EC_CMD_GET_PROTOCOL_INFO 0x0b + +/* Flags for ec_response_get_protocol_info.flags */ +/* EC_RES_IN_PROGRESS may be returned if a command is slow */ +#define EC_PROTOCOL_INFO_IN_PROGRESS_SUPPORTED (1 << 0) + +struct ec_response_get_protocol_info { + /* Fields which exist if at least protocol version 3 supported */ + + /* Bitmask of protocol versions supported (1 << n means version n)*/ + uint32_t protocol_versions; + + /* Maximum request packet size, in bytes */ + uint16_t max_request_packet_size; + + /* Maximum response packet size, in bytes */ + uint16_t max_response_packet_size; + + /* Flags; see EC_PROTOCOL_INFO_* */ + uint32_t flags; +} __packed; /*****************************************************************************/ /* Flash commands */ @@ -452,15 +603,15 @@ struct ec_params_flash_read { /* Write flash */ #define EC_CMD_FLASH_WRITE 0x12 +#define EC_VER_FLASH_WRITE 1 + +/* Version 0 of the flash command supported only 64 bytes of data */ +#define EC_FLASH_WRITE_VER0_SIZE 64 struct ec_params_flash_write { uint32_t offset; /* Byte offset to write */ uint32_t size; /* Size to write in bytes */ - /* - * Data to write. Could really use EC_PARAM_SIZE - 8, but tidiest to - * use a power of 2 so writes stay aligned. - */ - uint8_t data[64]; + /* Followed by data to write */ } __packed; /* Erase flash */ @@ -729,6 +880,49 @@ enum lightbar_command { }; /*****************************************************************************/ +/* LED control commands */ + +#define EC_CMD_LED_CONTROL 0x29 + +enum ec_led_id { + EC_LED_ID_BATTERY_LED = 0, + EC_LED_ID_POWER_BUTTON_LED, + EC_LED_ID_ADAPTER_LED, +}; + +/* LED control flags */ +#define EC_LED_FLAGS_QUERY (1 << 0) /* Query LED capability only */ +#define EC_LED_FLAGS_AUTO (1 << 1) /* Switch LED back to automatic control */ + +enum ec_led_colors { + EC_LED_COLOR_RED = 0, + EC_LED_COLOR_GREEN, + EC_LED_COLOR_BLUE, + EC_LED_COLOR_YELLOW, + EC_LED_COLOR_WHITE, + + EC_LED_COLOR_COUNT +}; + +struct ec_params_led_control { + uint8_t led_id; /* Which LED to control */ + uint8_t flags; /* Control flags */ + + uint8_t brightness[EC_LED_COLOR_COUNT]; +} __packed; + +struct ec_response_led_control { + /* + * Available brightness value range. + * + * Range 0 means color channel not present. + * Range 1 means on/off control. + * Other values means the LED is control by PWM. + */ + uint8_t brightness_range[EC_LED_COLOR_COUNT]; +} __packed; + +/*****************************************************************************/ /* Verified boot commands */ /* @@ -916,57 +1110,57 @@ struct ec_params_tmp006_set_calibration { } __packed; /*****************************************************************************/ -/* CROS_EC - Matrix KeyBoard Protocol */ +/* MKBP - Matrix KeyBoard Protocol */ /* * Read key state * - * Returns raw data for keyboard cols; see ec_response_cros_ec_info.cols for + * Returns raw data for keyboard cols; see ec_response_mkbp_info.cols for * expected response size. */ -#define EC_CMD_CROS_EC_STATE 0x60 +#define EC_CMD_MKBP_STATE 0x60 /* Provide information about the matrix : number of rows and columns */ -#define EC_CMD_CROS_EC_INFO 0x61 +#define EC_CMD_MKBP_INFO 0x61 -struct ec_response_cros_ec_info { +struct ec_response_mkbp_info { uint32_t rows; uint32_t cols; uint8_t switches; } __packed; /* Simulate key press */ -#define EC_CMD_CROS_EC_SIMULATE_KEY 0x62 +#define EC_CMD_MKBP_SIMULATE_KEY 0x62 -struct ec_params_cros_ec_simulate_key { +struct ec_params_mkbp_simulate_key { uint8_t col; uint8_t row; uint8_t pressed; } __packed; /* Configure keyboard scanning */ -#define EC_CMD_CROS_EC_SET_CONFIG 0x64 -#define EC_CMD_CROS_EC_GET_CONFIG 0x65 +#define EC_CMD_MKBP_SET_CONFIG 0x64 +#define EC_CMD_MKBP_GET_CONFIG 0x65 /* flags */ -enum cros_ec_config_flags { - EC_CROS_EC_FLAGS_ENABLE = 1, /* Enable keyboard scanning */ +enum mkbp_config_flags { + EC_MKBP_FLAGS_ENABLE = 1, /* Enable keyboard scanning */ }; -enum cros_ec_config_valid { - EC_CROS_EC_VALID_SCAN_PERIOD = 1 << 0, - EC_CROS_EC_VALID_POLL_TIMEOUT = 1 << 1, - EC_CROS_EC_VALID_MIN_POST_SCAN_DELAY = 1 << 3, - EC_CROS_EC_VALID_OUTPUT_SETTLE = 1 << 4, - EC_CROS_EC_VALID_DEBOUNCE_DOWN = 1 << 5, - EC_CROS_EC_VALID_DEBOUNCE_UP = 1 << 6, - EC_CROS_EC_VALID_FIFO_MAX_DEPTH = 1 << 7, +enum mkbp_config_valid { + EC_MKBP_VALID_SCAN_PERIOD = 1 << 0, + EC_MKBP_VALID_POLL_TIMEOUT = 1 << 1, + EC_MKBP_VALID_MIN_POST_SCAN_DELAY = 1 << 3, + EC_MKBP_VALID_OUTPUT_SETTLE = 1 << 4, + EC_MKBP_VALID_DEBOUNCE_DOWN = 1 << 5, + EC_MKBP_VALID_DEBOUNCE_UP = 1 << 6, + EC_MKBP_VALID_FIFO_MAX_DEPTH = 1 << 7, }; /* Configuration for our key scanning algorithm */ -struct ec_cros_ec_config { +struct ec_mkbp_config { uint32_t valid_mask; /* valid fields */ - uint8_t flags; /* some flags (enum cros_ec_config_flags) */ + uint8_t flags; /* some flags (enum mkbp_config_flags) */ uint8_t valid_flags; /* which flags are valid */ uint16_t scan_period_us; /* period between start of scans */ /* revert to interrupt mode after no activity for this long */ @@ -985,12 +1179,12 @@ struct ec_cros_ec_config { uint8_t fifo_max_depth; } __packed; -struct ec_params_cros_ec_set_config { - struct ec_cros_ec_config config; +struct ec_params_mkbp_set_config { + struct ec_mkbp_config config; } __packed; -struct ec_response_cros_ec_get_config { - struct ec_cros_ec_config config; +struct ec_response_mkbp_get_config { + struct ec_mkbp_config config; } __packed; /* Run the key scan emulation */ @@ -1146,7 +1340,7 @@ struct ec_response_gpio_get { #define EC_CMD_I2C_READ 0x94 struct ec_params_i2c_read { - uint16_t addr; + uint16_t addr; /* 8-bit address (7-bit shifted << 1) */ uint8_t read_size; /* Either 8 or 16. */ uint8_t port; uint8_t offset; @@ -1160,7 +1354,7 @@ struct ec_response_i2c_read { struct ec_params_i2c_write { uint16_t data; - uint16_t addr; + uint16_t addr; /* 8-bit address (7-bit shifted << 1) */ uint8_t write_size; /* Either 8 or 16. */ uint8_t port; uint8_t offset; @@ -1244,6 +1438,61 @@ struct ec_response_ldo_get { } __packed; /*****************************************************************************/ +/* Power info. */ + +/* + * Get power info. + */ +#define EC_CMD_POWER_INFO 0x9d + +struct ec_response_power_info { + uint32_t usb_dev_type; + uint16_t voltage_ac; + uint16_t voltage_system; + uint16_t current_system; + uint16_t usb_current_limit; +} __packed; + +/*****************************************************************************/ +/* I2C passthru command */ + +#define EC_CMD_I2C_PASSTHRU 0x9e + +/* Slave address is 10 (not 7) bit */ +#define EC_I2C_FLAG_10BIT (1 << 16) + +/* Read data; if not present, message is a write */ +#define EC_I2C_FLAG_READ (1 << 15) + +/* Mask for address */ +#define EC_I2C_ADDR_MASK 0x3ff + +#define EC_I2C_STATUS_NAK (1 << 0) /* Transfer was not acknowledged */ +#define EC_I2C_STATUS_TIMEOUT (1 << 1) /* Timeout during transfer */ + +/* Any error */ +#define EC_I2C_STATUS_ERROR (EC_I2C_STATUS_NAK | EC_I2C_STATUS_TIMEOUT) + +struct ec_params_i2c_passthru_msg { + uint16_t addr_flags; /* I2C slave address (7 or 10 bits) and flags */ + uint16_t len; /* Number of bytes to read or write */ +} __packed; + +struct ec_params_i2c_passthru { + uint8_t port; /* I2C port number */ + uint8_t num_msgs; /* Number of messages */ + struct ec_params_i2c_passthru_msg msg[]; + /* Data to write for all messages is concatenated here */ +} __packed; + +struct ec_response_i2c_passthru { + uint8_t i2c_status; /* Status flags (EC_I2C_STATUS_...) */ + uint8_t num_msgs; /* Number of messages processed */ + uint8_t data[]; /* Data read by messages concatenated here */ +} __packed; + + +/*****************************************************************************/ /* Temporary debug commands. TODO: remove this crosbug.com/p/13849 */ /* @@ -1259,7 +1508,16 @@ struct ec_response_ldo_get { #define EC_CMD_CHARGE_CURRENT_LIMIT 0xa1 struct ec_params_current_limit { - uint32_t limit; + uint32_t limit; /* in mA */ +} __packed; + +/* + * Set maximum external power current. + */ +#define EC_CMD_EXT_POWER_CURRENT_LIMIT 0xa2 + +struct ec_params_ext_power_current_limit { + uint32_t limit; /* in mA */ } __packed; /*****************************************************************************/ |