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Diffstat (limited to 'include/cros_ec.h')
| -rw-r--r-- | include/cros_ec.h | 449 |
1 files changed, 449 insertions, 0 deletions
diff --git a/include/cros_ec.h b/include/cros_ec.h new file mode 100644 index 0000000..335d5b4 --- /dev/null +++ b/include/cros_ec.h @@ -0,0 +1,449 @@ +/* + * Chromium OS cros_ec driver + * + * 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_EC_H +#define _CROS_EC_H + +#include <linux/compiler.h> +#include <ec_commands.h> +#include <fdtdec.h> +#include <cros_ec_message.h> + +/* Which interface is the device on? */ +enum cros_ec_interface_t { + CROS_EC_IF_NONE, + CROS_EC_IF_SPI, + CROS_EC_IF_I2C, + CROS_EC_IF_LPC, /* Intel Low Pin Count interface */ +}; + +/* Our configuration information */ +struct cros_ec_dev { + enum cros_ec_interface_t interface; + struct spi_slave *spi; /* Our SPI slave, if using SPI */ + int node; /* Our node */ + int parent_node; /* Our parent node (interface) */ + unsigned int cs; /* Our chip select */ + unsigned int addr; /* Device address (for I2C) */ + unsigned int bus_num; /* Bus number (for I2C) */ + unsigned int max_frequency; /* Maximum interface frequency */ + struct fdt_gpio_state ec_int; /* GPIO used as EC interrupt line */ + int cmd_version_is_supported; /* Device supports command versions */ + 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]; +}; + +/** + * 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 cros_ec_dev *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 cros_ec_dev *dev, struct mbkp_keyscan *scan); + +/** + * 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 cros_ec_dev *dev, + enum ec_current_image *image); + +/** + * Read the hash of the CROS-EC device firmware. + * + * @param dev CROS-EC device + * @param hash Destination for hash information + * @return 0 if ok, <0 on error + */ +int cros_ec_read_hash(struct cros_ec_dev *dev, + 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 cros_ec_dev *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 cros_ec_dev *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, +}; + +/** + * Set up the Chromium OS matrix keyboard protocol + * + * @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 cros_ec_dev **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 cros_ec_dev *dev, + struct ec_response_cros_ec_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 cros_ec_dev *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 cros_ec_dev *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 cros_ec_dev *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 cros_ec_dev *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 cros_ec_dev *dev, + const uint8_t *image, int image_size); + +/** + * Return a pointer to the board's CROS-EC device + * + * This should be implemented by board files. + * + * @return pointer to CROS-EC device, or NULL if none is available + */ +struct cros_ec_dev *board_get_cros_ec_dev(void); + + +/* Internal interfaces */ +int cros_ec_i2c_init(struct cros_ec_dev *dev, const void *blob); +int cros_ec_spi_init(struct cros_ec_dev *dev, const void *blob); +int cros_ec_lpc_init(struct cros_ec_dev *dev, const void *blob); + +/** + * Read information from the fdt for the i2c cros_ec interface + * + * @param dev CROS-EC device + * @param blob Device tree blob + * @return 0 if ok, -1 if we failed to read all required information + */ +int cros_ec_i2c_decode_fdt(struct cros_ec_dev *dev, const void *blob); + +/** + * Read information from the fdt for the spi cros_ec interface + * + * @param dev CROS-EC device + * @param blob Device tree blob + * @return 0 if ok, -1 if we failed to read all required information + */ +int cros_ec_spi_decode_fdt(struct cros_ec_dev *dev, const void *blob); + +/** + * Check whether the LPC interface supports new-style commands. + * + * LPC has its own way of doing this, which involves checking LPC values + * visible to the host. Do this, and update dev->cmd_version_is_supported + * accordingly. + * + * @param dev CROS-EC device to check + */ +int cros_ec_lpc_check_version(struct cros_ec_dev *dev); + +/** + * Send a command to an I2C CROS-EC device and return the reply. + * + * This rather complicated function deals with sending both old-style and + * new-style commands. The old ones have just a command byte and arguments. + * The new ones have version, command, arg-len, [args], chksum so are 3 bytes + * longer. + * + * The device's internal input/output buffers are used. + * + * @param dev CROS-EC device + * @param cmd Command to send (EC_CMD_...) + * @param cmd_version Version of command to send (EC_VER_...) + * @param dout Output data (may be NULL If dout_len=0) + * @param dout_len Size of output data in bytes + * @param dinp Returns pointer to response data + * @param din_len Maximum size of response in bytes + * @return number of bytes in response, or -1 on error + */ +int cros_ec_i2c_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version, + const uint8_t *dout, int dout_len, + uint8_t **dinp, int din_len); + +/** + * Send a command to a LPC CROS-EC device and return the reply. + * + * The device's internal input/output buffers are used. + * + * @param dev CROS-EC device + * @param cmd Command to send (EC_CMD_...) + * @param cmd_version Version of command to send (EC_VER_...) + * @param dout Output data (may be NULL If dout_len=0) + * @param dout_len Size of output data in bytes + * @param dinp Returns pointer to response data + * @param din_len Maximum size of response in bytes + * @return number of bytes in response, or -1 on error + */ +int cros_ec_lpc_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version, + const uint8_t *dout, int dout_len, + uint8_t **dinp, int din_len); + +int cros_ec_spi_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version, + const uint8_t *dout, int dout_len, + uint8_t **dinp, int din_len); + +/** + * 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); + +/** + * Decode a flash region parameter + * + * @param argc Number of params remaining + * @param argv List of remaining parameters + * @return flash region (EC_FLASH_REGION_...) or -1 on error + */ +int cros_ec_decode_region(int argc, char * const argv[]); + +int cros_ec_flash_erase(struct cros_ec_dev *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 cros_ec_dev *dev, uint8_t *data, uint32_t offset, + uint32_t size); + +/** + * 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 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 |