diff options
Diffstat (limited to 'roms/u-boot/drivers/misc/cros_ec.c')
| -rw-r--r-- | roms/u-boot/drivers/misc/cros_ec.c | 1672 |
1 files changed, 1672 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/misc/cros_ec.c b/roms/u-boot/drivers/misc/cros_ec.c new file mode 100644 index 000000000..7904d5cc7 --- /dev/null +++ b/roms/u-boot/drivers/misc/cros_ec.c @@ -0,0 +1,1672 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Chromium OS cros_ec driver + * + * Copyright (c) 2012 The Chromium OS Authors. + */ + +/* + * 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. + */ + +#define LOG_CATEGORY UCLASS_CROS_EC + +#include <common.h> +#include <command.h> +#include <dm.h> +#include <flash.h> +#include <i2c.h> +#include <cros_ec.h> +#include <fdtdec.h> +#include <log.h> +#include <malloc.h> +#include <spi.h> +#include <linux/delay.h> +#include <linux/errno.h> +#include <asm/io.h> +#include <asm-generic/gpio.h> +#include <dm/device-internal.h> +#include <dm/of_extra.h> +#include <dm/uclass-internal.h> + +#ifdef DEBUG_TRACE +#define debug_trace(fmt, b...) debug(fmt, #b) +#else +#define debug_trace(fmt, b...) +#endif + +enum { + /* Timeout waiting for a flash erase command to complete */ + CROS_EC_CMD_TIMEOUT_MS = 5000, + /* Timeout waiting for a synchronous hash to be recomputed */ + CROS_EC_CMD_HASH_TIMEOUT_MS = 2000, + + /* Wait 10 ms between attempts to check if EC's hash is ready */ + CROS_EC_HASH_CHECK_DELAY_MS = 10, + +}; + +#define INVALID_HCMD 0xFF + +/* + * Map UHEPI masks to non UHEPI commands in order to support old EC FW + * which does not support UHEPI command. + */ +static const struct { + u8 set_cmd; + u8 clear_cmd; + u8 get_cmd; +} event_map[] = { + [EC_HOST_EVENT_MAIN] = { + INVALID_HCMD, EC_CMD_HOST_EVENT_CLEAR, + INVALID_HCMD, + }, + [EC_HOST_EVENT_B] = { + INVALID_HCMD, EC_CMD_HOST_EVENT_CLEAR_B, + EC_CMD_HOST_EVENT_GET_B, + }, + [EC_HOST_EVENT_SCI_MASK] = { + EC_CMD_HOST_EVENT_SET_SCI_MASK, INVALID_HCMD, + EC_CMD_HOST_EVENT_GET_SCI_MASK, + }, + [EC_HOST_EVENT_SMI_MASK] = { + EC_CMD_HOST_EVENT_SET_SMI_MASK, INVALID_HCMD, + EC_CMD_HOST_EVENT_GET_SMI_MASK, + }, + [EC_HOST_EVENT_ALWAYS_REPORT_MASK] = { + INVALID_HCMD, INVALID_HCMD, INVALID_HCMD, + }, + [EC_HOST_EVENT_ACTIVE_WAKE_MASK] = { + EC_CMD_HOST_EVENT_SET_WAKE_MASK, INVALID_HCMD, + EC_CMD_HOST_EVENT_GET_WAKE_MASK, + }, + [EC_HOST_EVENT_LAZY_WAKE_MASK_S0IX] = { + EC_CMD_HOST_EVENT_SET_WAKE_MASK, INVALID_HCMD, + EC_CMD_HOST_EVENT_GET_WAKE_MASK, + }, + [EC_HOST_EVENT_LAZY_WAKE_MASK_S3] = { + EC_CMD_HOST_EVENT_SET_WAKE_MASK, INVALID_HCMD, + EC_CMD_HOST_EVENT_GET_WAKE_MASK, + }, + [EC_HOST_EVENT_LAZY_WAKE_MASK_S5] = { + EC_CMD_HOST_EVENT_SET_WAKE_MASK, INVALID_HCMD, + EC_CMD_HOST_EVENT_GET_WAKE_MASK, + }, +}; + +void cros_ec_dump_data(const char *name, int cmd, const uint8_t *data, int len) +{ +#ifdef DEBUG + int i; + + printf("%s: ", name); + if (cmd != -1) + printf("cmd=%#x: ", cmd); + for (i = 0; i < len; i++) + printf("%02x ", data[i]); + printf("\n"); +#endif +} + +/* + * 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 csum, i; + + for (i = csum = 0; i < size; i++) + csum += data[i]; + return csum & 0xff; +} + +/** + * Create a request packet for protocol version 3. + * + * The packet is stored in the device's internal output buffer. + * + * @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 + * @return packet size in bytes, or <0 if error. + */ +static int create_proto3_request(struct cros_ec_dev *cdev, + int cmd, int cmd_version, + const void *dout, int dout_len) +{ + struct ec_host_request *rq = (struct ec_host_request *)cdev->dout; + int out_bytes = dout_len + sizeof(*rq); + + /* Fail if output size is too big */ + if (out_bytes > (int)sizeof(cdev->dout)) { + debug("%s: Cannot send %d bytes\n", __func__, dout_len); + return -EC_RES_REQUEST_TRUNCATED; + } + + /* Fill in request packet */ + rq->struct_version = EC_HOST_REQUEST_VERSION; + rq->checksum = 0; + rq->command = cmd; + rq->command_version = cmd_version; + rq->reserved = 0; + rq->data_len = dout_len; + + /* Copy data after header */ + memcpy(rq + 1, dout, dout_len); + + /* Write checksum field so the entire packet sums to 0 */ + rq->checksum = (uint8_t)(-cros_ec_calc_checksum(cdev->dout, out_bytes)); + + cros_ec_dump_data("out", cmd, cdev->dout, out_bytes); + + /* Return size of request packet */ + return out_bytes; +} + +/** + * Prepare the device to receive a protocol version 3 response. + * + * @param dev CROS-EC device + * @param din_len Maximum size of response in bytes + * @return maximum expected number of bytes in response, or <0 if error. + */ +static int prepare_proto3_response_buffer(struct cros_ec_dev *cdev, int din_len) +{ + int in_bytes = din_len + sizeof(struct ec_host_response); + + /* Fail if input size is too big */ + if (in_bytes > (int)sizeof(cdev->din)) { + debug("%s: Cannot receive %d bytes\n", __func__, din_len); + return -EC_RES_RESPONSE_TOO_BIG; + } + + /* Return expected size of response packet */ + return in_bytes; +} + +/** + * Handle a protocol version 3 response packet. + * + * The packet must already be stored in the device's internal input buffer. + * + * @param dev CROS-EC device + * @param dinp Returns pointer to response data + * @param din_len Maximum size of response in bytes + * @return number of bytes of response data, or <0 if error. Note that error + * codes can be from errno.h or -ve EC_RES_INVALID_CHECKSUM values (and they + * overlap!) + */ +static int handle_proto3_response(struct cros_ec_dev *dev, + uint8_t **dinp, int din_len) +{ + struct ec_host_response *rs = (struct ec_host_response *)dev->din; + int in_bytes; + int csum; + + cros_ec_dump_data("in-header", -1, dev->din, sizeof(*rs)); + + /* Check input data */ + if (rs->struct_version != EC_HOST_RESPONSE_VERSION) { + debug("%s: EC response version mismatch\n", __func__); + return -EC_RES_INVALID_RESPONSE; + } + + if (rs->reserved) { + debug("%s: EC response reserved != 0\n", __func__); + return -EC_RES_INVALID_RESPONSE; + } + + if (rs->data_len > din_len) { + debug("%s: EC returned too much data\n", __func__); + return -EC_RES_RESPONSE_TOO_BIG; + } + + cros_ec_dump_data("in-data", -1, dev->din + sizeof(*rs), rs->data_len); + + /* Update in_bytes to actual data size */ + in_bytes = sizeof(*rs) + rs->data_len; + + /* Verify checksum */ + csum = cros_ec_calc_checksum(dev->din, in_bytes); + if (csum) { + debug("%s: EC response checksum invalid: 0x%02x\n", __func__, + csum); + return -EC_RES_INVALID_CHECKSUM; + } + + /* Return error result, if any */ + if (rs->result) + return -(int)rs->result; + + /* If we're still here, set response data pointer and return length */ + *dinp = (uint8_t *)(rs + 1); + + return rs->data_len; +} + +static int send_command_proto3(struct cros_ec_dev *cdev, + int cmd, int cmd_version, + const void *dout, int dout_len, + uint8_t **dinp, int din_len) +{ + struct dm_cros_ec_ops *ops; + int out_bytes, in_bytes; + int rv; + + /* Create request packet */ + out_bytes = create_proto3_request(cdev, cmd, cmd_version, + dout, dout_len); + if (out_bytes < 0) + return out_bytes; + + /* Prepare response buffer */ + in_bytes = prepare_proto3_response_buffer(cdev, din_len); + if (in_bytes < 0) + return in_bytes; + + ops = dm_cros_ec_get_ops(cdev->dev); + rv = ops->packet ? ops->packet(cdev->dev, out_bytes, in_bytes) : + -ENOSYS; + if (rv < 0) + return rv; + + /* Process the response */ + return handle_proto3_response(cdev, dinp, din_len); +} + +static int send_command(struct cros_ec_dev *dev, uint cmd, int cmd_version, + const void *dout, int dout_len, + uint8_t **dinp, int din_len) +{ + struct dm_cros_ec_ops *ops; + int ret = -1; + + /* Handle protocol version 3 support */ + if (dev->protocol_version == 3) { + return send_command_proto3(dev, cmd, cmd_version, + dout, dout_len, dinp, din_len); + } + + ops = dm_cros_ec_get_ops(dev->dev); + ret = ops->command(dev->dev, cmd, cmd_version, + (const uint8_t *)dout, dout_len, dinp, din_len); + + return ret; +} + +/** + * Send a command to the 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 Response data (may be NULL If din_len=0). + * If not NULL, it will be updated to point to the data + * and will always be double word aligned (64-bits) + * @param din_len Maximum size of response in bytes + * @return number of bytes in response, or -ve on error + */ +static int ec_command_inptr(struct udevice *dev, uint cmd, + int cmd_version, const void *dout, int dout_len, + uint8_t **dinp, int din_len) +{ + struct cros_ec_dev *cdev = dev_get_uclass_priv(dev); + uint8_t *din = NULL; + int len; + + len = send_command(cdev, cmd, cmd_version, dout, dout_len, &din, + din_len); + + /* If the command doesn't complete, wait a while */ + if (len == -EC_RES_IN_PROGRESS) { + struct ec_response_get_comms_status *resp = NULL; + ulong start; + + /* Wait for command to complete */ + start = get_timer(0); + do { + int ret; + + mdelay(50); /* Insert some reasonable delay */ + ret = send_command(cdev, EC_CMD_GET_COMMS_STATUS, 0, + NULL, 0, + (uint8_t **)&resp, sizeof(*resp)); + if (ret < 0) + return ret; + + if (get_timer(start) > CROS_EC_CMD_TIMEOUT_MS) { + debug("%s: Command %#02x timeout\n", + __func__, cmd); + return -EC_RES_TIMEOUT; + } + } while (resp->flags & EC_COMMS_STATUS_PROCESSING); + + /* OK it completed, so read the status response */ + /* not sure why it was 0 for the last argument */ + len = send_command(cdev, EC_CMD_RESEND_RESPONSE, 0, NULL, 0, + &din, din_len); + } + + debug("%s: len=%d, din=%p\n", __func__, len, din); + if (dinp) { + /* If we have any data to return, it must be 64bit-aligned */ + assert(len <= 0 || !((uintptr_t)din & 7)); + *dinp = din; + } + + return len; +} + +/** + * Send a command to the 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 din Response data (may be NULL If din_len=0). + * It not NULL, it is a place for ec_command() to copy the + * data to. + * @param din_len Maximum size of response in bytes + * @return number of bytes in response, or -ve on error + */ +static int ec_command(struct udevice *dev, uint cmd, int cmd_version, + const void *dout, int dout_len, + void *din, int din_len) +{ + uint8_t *in_buffer; + int len; + + assert((din_len == 0) || din); + len = ec_command_inptr(dev, cmd, cmd_version, dout, dout_len, + &in_buffer, din_len); + if (len > 0) { + /* + * If we were asked to put it somewhere, do so, otherwise just + * disregard the result. + */ + if (din && in_buffer) { + assert(len <= din_len); + if (len > din_len) + return -ENOSPC; + memmove(din, in_buffer, len); + } + } + return len; +} + +int cros_ec_scan_keyboard(struct udevice *dev, struct mbkp_keyscan *scan) +{ + if (ec_command(dev, EC_CMD_MKBP_STATE, 0, NULL, 0, scan, + sizeof(scan->data)) != sizeof(scan->data)) + return -1; + + return 0; +} + +int cros_ec_get_next_event(struct udevice *dev, + struct ec_response_get_next_event *event) +{ + int ret; + + ret = ec_command(dev, EC_CMD_GET_NEXT_EVENT, 0, NULL, 0, + event, sizeof(*event)); + if (ret < 0) + return ret; + else if (ret != sizeof(*event)) + return -EC_RES_INVALID_RESPONSE; + + return 0; +} + +int cros_ec_read_id(struct udevice *dev, char *id, int maxlen) +{ + struct ec_response_get_version *r; + int ret; + + ret = ec_command_inptr(dev, EC_CMD_GET_VERSION, 0, NULL, 0, + (uint8_t **)&r, sizeof(*r)); + if (ret != sizeof(*r)) { + log_err("Got rc %d, expected %u\n", ret, (uint)sizeof(*r)); + return -1; + } + + if (maxlen > (int)sizeof(r->version_string_ro)) + maxlen = sizeof(r->version_string_ro); + + switch (r->current_image) { + case EC_IMAGE_RO: + memcpy(id, r->version_string_ro, maxlen); + break; + case EC_IMAGE_RW: + memcpy(id, r->version_string_rw, maxlen); + break; + default: + log_err("Invalid EC image %d\n", r->current_image); + return -1; + } + + id[maxlen - 1] = '\0'; + return 0; +} + +int cros_ec_read_version(struct udevice *dev, + struct ec_response_get_version **versionp) +{ + if (ec_command_inptr(dev, EC_CMD_GET_VERSION, 0, NULL, 0, + (uint8_t **)versionp, sizeof(**versionp)) + != sizeof(**versionp)) + return -1; + + return 0; +} + +int cros_ec_read_build_info(struct udevice *dev, char **strp) +{ + if (ec_command_inptr(dev, EC_CMD_GET_BUILD_INFO, 0, NULL, 0, + (uint8_t **)strp, EC_PROTO2_MAX_PARAM_SIZE) < 0) + return -1; + + return 0; +} + +int cros_ec_read_current_image(struct udevice *dev, + enum ec_current_image *image) +{ + struct ec_response_get_version *r; + + if (ec_command_inptr(dev, EC_CMD_GET_VERSION, 0, NULL, 0, + (uint8_t **)&r, sizeof(*r)) != sizeof(*r)) + return -1; + + *image = r->current_image; + return 0; +} + +static int cros_ec_wait_on_hash_done(struct udevice *dev, + struct ec_params_vboot_hash *p, + struct ec_response_vboot_hash *hash) +{ + ulong start; + + start = get_timer(0); + while (hash->status == EC_VBOOT_HASH_STATUS_BUSY) { + mdelay(CROS_EC_HASH_CHECK_DELAY_MS); + + p->cmd = EC_VBOOT_HASH_GET; + + if (ec_command(dev, EC_CMD_VBOOT_HASH, 0, p, sizeof(*p), hash, + sizeof(*hash)) < 0) + return -1; + + if (get_timer(start) > CROS_EC_CMD_HASH_TIMEOUT_MS) { + debug("%s: EC_VBOOT_HASH_GET timeout\n", __func__); + return -EC_RES_TIMEOUT; + } + } + return 0; +} + +int cros_ec_read_hash(struct udevice *dev, uint hash_offset, + struct ec_response_vboot_hash *hash) +{ + struct ec_params_vboot_hash p; + int rv; + + p.cmd = EC_VBOOT_HASH_GET; + p.offset = hash_offset; + if (ec_command(dev, EC_CMD_VBOOT_HASH, 0, &p, sizeof(p), + hash, sizeof(*hash)) < 0) + return -1; + + /* If the EC is busy calculating the hash, fidget until it's done. */ + rv = cros_ec_wait_on_hash_done(dev, &p, hash); + if (rv) + return rv; + + /* If the hash is valid, we're done. Otherwise, we have to kick it off + * again and wait for it to complete. Note that we explicitly assume + * that hashing zero bytes is always wrong, even though that would + * produce a valid hash value. */ + if (hash->status == EC_VBOOT_HASH_STATUS_DONE && hash->size) + return 0; + + debug("%s: No valid hash (status=%d size=%d). Compute one...\n", + __func__, hash->status, hash->size); + + p.cmd = EC_VBOOT_HASH_START; + p.hash_type = EC_VBOOT_HASH_TYPE_SHA256; + p.nonce_size = 0; + p.offset = hash_offset; + + if (ec_command(dev, EC_CMD_VBOOT_HASH, 0, &p, sizeof(p), + hash, sizeof(*hash)) < 0) + return -1; + + rv = cros_ec_wait_on_hash_done(dev, &p, hash); + if (rv) + return rv; + if (hash->status != EC_VBOOT_HASH_STATUS_DONE) { + log_err("Hash did not complete, status=%d\n", hash->status); + return -EIO; + } + + debug("%s: hash done\n", __func__); + + return 0; +} + +static int cros_ec_invalidate_hash(struct udevice *dev) +{ + struct ec_params_vboot_hash p; + struct ec_response_vboot_hash *hash; + + /* We don't have an explict command for the EC to discard its current + * hash value, so we'll just tell it to calculate one that we know is + * wrong (we claim that hashing zero bytes is always invalid). + */ + p.cmd = EC_VBOOT_HASH_RECALC; + p.hash_type = EC_VBOOT_HASH_TYPE_SHA256; + p.nonce_size = 0; + p.offset = 0; + p.size = 0; + + debug("%s:\n", __func__); + + if (ec_command_inptr(dev, EC_CMD_VBOOT_HASH, 0, &p, sizeof(p), + (uint8_t **)&hash, sizeof(*hash)) < 0) + return -1; + + /* No need to wait for it to finish */ + return 0; +} + +int cros_ec_hello(struct udevice *dev, uint *handshakep) +{ + struct ec_params_hello req; + struct ec_response_hello *resp; + + req.in_data = 0x12345678; + if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req, sizeof(req), + (uint8_t **)&resp, sizeof(*resp)) < 0) + return -EIO; + if (resp->out_data != req.in_data + 0x01020304) { + printf("Received invalid handshake %x\n", resp->out_data); + if (handshakep) + *handshakep = req.in_data; + return -ENOTSYNC; + } + + return 0; +} + +int cros_ec_reboot(struct udevice *dev, enum ec_reboot_cmd cmd, uint8_t flags) +{ + struct ec_params_reboot_ec p; + + p.cmd = cmd; + p.flags = flags; + + if (ec_command_inptr(dev, EC_CMD_REBOOT_EC, 0, &p, sizeof(p), NULL, 0) + < 0) + return -1; + + if (!(flags & EC_REBOOT_FLAG_ON_AP_SHUTDOWN)) { + ulong start; + + /* + * EC reboot will take place immediately so delay to allow it + * to complete. Note that some reboot types (EC_REBOOT_COLD) + * will reboot the AP as well, in which case we won't actually + * get to this point. + */ + mdelay(50); + start = get_timer(0); + while (cros_ec_hello(dev, NULL)) { + if (get_timer(start) > 3000) { + log_err("EC did not return from reboot\n"); + return -ETIMEDOUT; + } + mdelay(5); + } + } + + return 0; +} + +int cros_ec_interrupt_pending(struct udevice *dev) +{ + struct cros_ec_dev *cdev = dev_get_uclass_priv(dev); + + /* no interrupt support : always poll */ + if (!dm_gpio_is_valid(&cdev->ec_int)) + return -ENOENT; + + return dm_gpio_get_value(&cdev->ec_int); +} + +int cros_ec_info(struct udevice *dev, struct ec_response_mkbp_info *info) +{ + if (ec_command(dev, EC_CMD_MKBP_INFO, 0, NULL, 0, info, + sizeof(*info)) != sizeof(*info)) + return -1; + + return 0; +} + +int cros_ec_get_event_mask(struct udevice *dev, uint type, uint32_t *mask) +{ + struct ec_response_host_event_mask rsp; + int ret; + + ret = ec_command(dev, type, 0, NULL, 0, &rsp, sizeof(rsp)); + if (ret < 0) + return ret; + else if (ret != sizeof(rsp)) + return -EINVAL; + + *mask = rsp.mask; + + return 0; +} + +int cros_ec_set_event_mask(struct udevice *dev, uint type, uint32_t mask) +{ + struct ec_params_host_event_mask req; + int ret; + + req.mask = mask; + + ret = ec_command(dev, type, 0, &req, sizeof(req), NULL, 0); + if (ret < 0) + return ret; + + return 0; +} + +int cros_ec_get_host_events(struct udevice *dev, uint32_t *events_ptr) +{ + struct ec_response_host_event_mask *resp; + + /* + * Use the B copy of the event flags, because the main copy is already + * used by ACPI/SMI. + */ + if (ec_command_inptr(dev, EC_CMD_HOST_EVENT_GET_B, 0, NULL, 0, + (uint8_t **)&resp, sizeof(*resp)) < (int)sizeof(*resp)) + return -1; + + if (resp->mask & EC_HOST_EVENT_MASK(EC_HOST_EVENT_INVALID)) + return -1; + + *events_ptr = resp->mask; + return 0; +} + +int cros_ec_clear_host_events(struct udevice *dev, uint32_t events) +{ + struct ec_params_host_event_mask params; + + params.mask = events; + + /* + * Use the B copy of the event flags, so it affects the data returned + * by cros_ec_get_host_events(). + */ + if (ec_command_inptr(dev, EC_CMD_HOST_EVENT_CLEAR_B, 0, + ¶ms, sizeof(params), NULL, 0) < 0) + return -1; + + return 0; +} + +int cros_ec_flash_protect(struct udevice *dev, uint32_t set_mask, + uint32_t set_flags, + struct ec_response_flash_protect *resp) +{ + struct ec_params_flash_protect params; + + params.mask = set_mask; + params.flags = set_flags; + + if (ec_command(dev, EC_CMD_FLASH_PROTECT, EC_VER_FLASH_PROTECT, + ¶ms, sizeof(params), + resp, sizeof(*resp)) != sizeof(*resp)) + return -1; + + return 0; +} + +int cros_ec_entering_mode(struct udevice *dev, int mode) +{ + int rc; + + rc = ec_command(dev, EC_CMD_ENTERING_MODE, 0, &mode, sizeof(mode), + NULL, 0); + if (rc) + return -1; + return 0; +} + +static int cros_ec_check_version(struct udevice *dev) +{ + struct cros_ec_dev *cdev = dev_get_uclass_priv(dev); + struct ec_params_hello req; + + struct dm_cros_ec_ops *ops; + int ret; + + ops = dm_cros_ec_get_ops(dev); + if (ops->check_version) { + ret = ops->check_version(dev); + if (ret) + return ret; + } + + /* + * TODO(sjg@chromium.org). + * There is a strange oddity here with the EC. We could just ignore + * the response, i.e. pass the last two parameters as NULL and 0. + * In this case we won't read back very many bytes from the EC. + * On the I2C bus the EC gets upset about this and will try to send + * the bytes anyway. This means that we will have to wait for that + * to complete before continuing with a new EC command. + * + * This problem is probably unique to the I2C bus. + * + * So for now, just read all the data anyway. + */ + + /* Try sending a version 3 packet */ + cdev->protocol_version = 3; + req.in_data = 0; + ret = cros_ec_hello(dev, NULL); + if (!ret || ret == -ENOTSYNC) + return 0; + + /* Try sending a version 2 packet */ + cdev->protocol_version = 2; + ret = cros_ec_hello(dev, NULL); + if (!ret || ret == -ENOTSYNC) + return 0; + + /* + * Fail if we're still here, since the EC doesn't understand any + * protcol version we speak. Version 1 interface without command + * version is no longer supported, and we don't know about any new + * protocol versions. + */ + cdev->protocol_version = 0; + printf("%s: ERROR: old EC interface not supported\n", __func__); + return -1; +} + +int cros_ec_test(struct udevice *dev) +{ + uint out_data; + int ret; + + ret = cros_ec_hello(dev, &out_data); + if (ret == -ENOTSYNC) { + printf("Received invalid handshake %x\n", out_data); + return ret; + } else if (ret) { + printf("ec_command_inptr() returned error\n"); + return ret; + } + + return 0; +} + +int cros_ec_flash_offset(struct udevice *dev, enum ec_flash_region region, + uint32_t *offset, uint32_t *size) +{ + struct ec_params_flash_region_info p; + struct ec_response_flash_region_info *r; + int ret; + + p.region = region; + ret = ec_command_inptr(dev, EC_CMD_FLASH_REGION_INFO, + EC_VER_FLASH_REGION_INFO, + &p, sizeof(p), (uint8_t **)&r, sizeof(*r)); + if (ret != sizeof(*r)) + return -1; + + if (offset) + *offset = r->offset; + if (size) + *size = r->size; + + return 0; +} + +int cros_ec_flash_erase(struct udevice *dev, uint32_t offset, uint32_t size) +{ + struct ec_params_flash_erase p; + + p.offset = offset; + p.size = size; + return ec_command_inptr(dev, EC_CMD_FLASH_ERASE, 0, &p, sizeof(p), + NULL, 0); +} + +/** + * Write a single block to the flash + * + * Write a block of data to the EC flash. The size must not exceed the flash + * write block size which you can obtain from cros_ec_flash_write_burst_size(). + * + * 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 + */ +static int cros_ec_flash_write_block(struct udevice *dev, const uint8_t *data, + uint32_t offset, uint32_t size) +{ + struct ec_params_flash_write *p; + int ret; + + p = malloc(sizeof(*p) + size); + if (!p) + return -ENOMEM; + + p->offset = offset; + p->size = size; + assert(data && p->size <= EC_FLASH_WRITE_VER0_SIZE); + memcpy(p + 1, data, p->size); + + ret = ec_command_inptr(dev, EC_CMD_FLASH_WRITE, 0, + p, sizeof(*p) + size, NULL, 0) >= 0 ? 0 : -1; + + free(p); + + return ret; +} + +/** + * Return optimal flash write burst size + */ +static int cros_ec_flash_write_burst_size(struct udevice *dev) +{ + return EC_FLASH_WRITE_VER0_SIZE; +} + +/** + * Check if a block of data is erased (all 0xff) + * + * This function is useful when dealing with flash, for checking whether a + * data block is erased and thus does not need to be programmed. + * + * @param data Pointer to data to check (must be word-aligned) + * @param size Number of bytes to check (must be word-aligned) + * @return 0 if erased, non-zero if any word is not erased + */ +static int cros_ec_data_is_erased(const uint32_t *data, int size) +{ + assert(!(size & 3)); + size /= sizeof(uint32_t); + for (; size > 0; size -= 4, data++) + if (*data != -1U) + return 0; + + return 1; +} + +/** + * 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) +{ + int ret; + + ret = ec_command(dev, EC_CMD_FLASH_INFO, 0, + NULL, 0, info, sizeof(*info)); + if (ret < 0) + return ret; + + return ret < sizeof(*info) ? -1 : 0; +} + +int cros_ec_flash_write(struct udevice *dev, const uint8_t *data, + uint32_t offset, uint32_t size) +{ + struct cros_ec_dev *cdev = dev_get_uclass_priv(dev); + uint32_t burst = cros_ec_flash_write_burst_size(dev); + uint32_t end, off; + int ret; + + if (!burst) + return -EINVAL; + + /* + * TODO: round up to the nearest multiple of write size. Can get away + * without that on link right now because its write size is 4 bytes. + */ + end = offset + size; + for (off = offset; off < end; off += burst, data += burst) { + uint32_t todo; + + /* If the data is empty, there is no point in programming it */ + todo = min(end - off, burst); + if (cdev->optimise_flash_write && + cros_ec_data_is_erased((uint32_t *)data, todo)) + continue; + + ret = cros_ec_flash_write_block(dev, data, off, todo); + if (ret) + return ret; + } + + return 0; +} + +/** + * Run verification on a slot + * + * @param me CrosEc instance + * @param region Region to run verification on + * @return 0 if success or not applicable. Non-zero if verification failed. + */ +int cros_ec_efs_verify(struct udevice *dev, enum ec_flash_region region) +{ + struct ec_params_efs_verify p; + int rv; + + log_info("EFS: EC is verifying updated image...\n"); + p.region = region; + + rv = ec_command(dev, EC_CMD_EFS_VERIFY, 0, &p, sizeof(p), NULL, 0); + if (rv >= 0) { + log_info("EFS: Verification success\n"); + return 0; + } + if (rv == -EC_RES_INVALID_COMMAND) { + log_info("EFS: EC doesn't support EFS_VERIFY command\n"); + return 0; + } + log_info("EFS: Verification failed\n"); + + return rv; +} + +/** + * Read a single block from the flash + * + * Read a block of data from the EC flash. The size must not exceed the flash + * write block size which you can obtain from cros_ec_flash_write_burst_size(). + * + * 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 + */ +static int cros_ec_flash_read_block(struct udevice *dev, uint8_t *data, + uint32_t offset, uint32_t size) +{ + struct ec_params_flash_read p; + + p.offset = offset; + p.size = size; + + return ec_command(dev, EC_CMD_FLASH_READ, 0, + &p, sizeof(p), data, size) >= 0 ? 0 : -1; +} + +int cros_ec_flash_read(struct udevice *dev, uint8_t *data, uint32_t offset, + uint32_t size) +{ + uint32_t burst = cros_ec_flash_write_burst_size(dev); + uint32_t end, off; + int ret; + + end = offset + size; + for (off = offset; off < end; off += burst, data += burst) { + ret = cros_ec_flash_read_block(dev, data, off, + min(end - off, burst)); + if (ret) + return ret; + } + + return 0; +} + +int cros_ec_flash_update_rw(struct udevice *dev, const uint8_t *image, + int image_size) +{ + uint32_t rw_offset, rw_size; + int ret; + + if (cros_ec_flash_offset(dev, EC_FLASH_REGION_ACTIVE, &rw_offset, + &rw_size)) + return -1; + if (image_size > (int)rw_size) + return -1; + + /* Invalidate the existing hash, just in case the AP reboots + * unexpectedly during the update. If that happened, the EC RW firmware + * would be invalid, but the EC would still have the original hash. + */ + ret = cros_ec_invalidate_hash(dev); + if (ret) + return ret; + + /* + * Erase the entire RW section, so that the EC doesn't see any garbage + * past the new image if it's smaller than the current image. + * + * TODO: could optimize this to erase just the current image, since + * presumably everything past that is 0xff's. But would still need to + * round up to the nearest multiple of erase size. + */ + ret = cros_ec_flash_erase(dev, rw_offset, rw_size); + if (ret) + return ret; + + /* Write the image */ + ret = cros_ec_flash_write(dev, image, rw_offset, image_size); + if (ret) + return ret; + + return 0; +} + +int cros_ec_get_sku_id(struct udevice *dev) +{ + struct ec_sku_id_info *r; + int ret; + + ret = ec_command_inptr(dev, EC_CMD_GET_SKU_ID, 0, NULL, 0, + (uint8_t **)&r, sizeof(*r)); + if (ret != sizeof(*r)) + return -ret; + + return r->sku_id; +} + +int cros_ec_read_nvdata(struct udevice *dev, uint8_t *block, int size) +{ + struct ec_params_vbnvcontext p; + int len; + + if (size != EC_VBNV_BLOCK_SIZE && size != EC_VBNV_BLOCK_SIZE_V2) + return -EINVAL; + + p.op = EC_VBNV_CONTEXT_OP_READ; + + len = ec_command(dev, EC_CMD_VBNV_CONTEXT, EC_VER_VBNV_CONTEXT, + &p, sizeof(uint32_t) + size, block, size); + if (len != size) { + log_err("Expected %d bytes, got %d\n", size, len); + return -EIO; + } + + return 0; +} + +int cros_ec_write_nvdata(struct udevice *dev, const uint8_t *block, int size) +{ + struct ec_params_vbnvcontext p; + int len; + + if (size != EC_VBNV_BLOCK_SIZE && size != EC_VBNV_BLOCK_SIZE_V2) + return -EINVAL; + p.op = EC_VBNV_CONTEXT_OP_WRITE; + memcpy(p.block, block, size); + + len = ec_command_inptr(dev, EC_CMD_VBNV_CONTEXT, EC_VER_VBNV_CONTEXT, + &p, sizeof(uint32_t) + size, NULL, 0); + if (len < 0) + return -1; + + return 0; +} + +int cros_ec_battery_cutoff(struct udevice *dev, uint8_t flags) +{ + struct ec_params_battery_cutoff p; + int len; + + p.flags = flags; + len = ec_command(dev, EC_CMD_BATTERY_CUT_OFF, 1, &p, sizeof(p), + NULL, 0); + + if (len < 0) + return -1; + return 0; +} + +int cros_ec_set_pwm_duty(struct udevice *dev, uint8_t index, uint16_t duty) +{ + struct ec_params_pwm_set_duty p; + int ret; + + p.duty = duty; + p.pwm_type = EC_PWM_TYPE_GENERIC; + p.index = index; + + ret = ec_command(dev, EC_CMD_PWM_SET_DUTY, 0, &p, sizeof(p), + NULL, 0); + if (ret < 0) + return ret; + + return 0; +} + +int cros_ec_set_ldo(struct udevice *dev, uint8_t index, uint8_t state) +{ + struct ec_params_ldo_set params; + + params.index = index; + params.state = state; + + if (ec_command_inptr(dev, EC_CMD_LDO_SET, 0, ¶ms, sizeof(params), + NULL, 0)) + return -1; + + return 0; +} + +int cros_ec_get_ldo(struct udevice *dev, uint8_t index, uint8_t *state) +{ + struct ec_params_ldo_get params; + struct ec_response_ldo_get *resp; + + params.index = index; + + if (ec_command_inptr(dev, EC_CMD_LDO_GET, 0, ¶ms, sizeof(params), + (uint8_t **)&resp, sizeof(*resp)) != + sizeof(*resp)) + return -1; + + *state = resp->state; + + return 0; +} + +int cros_ec_register(struct udevice *dev) +{ + struct cros_ec_dev *cdev = dev_get_uclass_priv(dev); + char id[MSG_BYTES]; + + cdev->dev = dev; + gpio_request_by_name(dev, "ec-interrupt", 0, &cdev->ec_int, + GPIOD_IS_IN); + cdev->optimise_flash_write = dev_read_bool(dev, "optimise-flash-write"); + + if (cros_ec_check_version(dev)) { + debug("%s: Could not detect CROS-EC version\n", __func__); + return -CROS_EC_ERR_CHECK_VERSION; + } + + if (cros_ec_read_id(dev, id, sizeof(id))) { + debug("%s: Could not read KBC ID\n", __func__); + return -CROS_EC_ERR_READ_ID; + } + + /* Remember this device for use by the cros_ec command */ + debug("Google Chrome EC v%d CROS-EC driver ready, id '%s'\n", + cdev->protocol_version, id); + + return 0; +} + +int cros_ec_decode_ec_flash(struct udevice *dev, struct fdt_cros_ec *config) +{ + ofnode flash_node, node; + + flash_node = dev_read_subnode(dev, "flash"); + if (!ofnode_valid(flash_node)) { + debug("Failed to find flash node\n"); + return -1; + } + + if (ofnode_read_fmap_entry(flash_node, &config->flash)) { + debug("Failed to decode flash node in chrome-ec\n"); + return -1; + } + + config->flash_erase_value = ofnode_read_s32_default(flash_node, + "erase-value", -1); + ofnode_for_each_subnode(node, flash_node) { + const char *name = ofnode_get_name(node); + enum ec_flash_region region; + + if (0 == strcmp(name, "ro")) { + region = EC_FLASH_REGION_RO; + } else if (0 == strcmp(name, "rw")) { + region = EC_FLASH_REGION_ACTIVE; + } else if (0 == strcmp(name, "wp-ro")) { + region = EC_FLASH_REGION_WP_RO; + } else { + debug("Unknown EC flash region name '%s'\n", name); + return -1; + } + + if (ofnode_read_fmap_entry(node, &config->region[region])) { + debug("Failed to decode flash region in chrome-ec'\n"); + return -1; + } + } + + return 0; +} + +int cros_ec_i2c_tunnel(struct udevice *dev, int port, struct i2c_msg *in, + int nmsgs) +{ + union { + struct ec_params_i2c_passthru p; + uint8_t outbuf[EC_PROTO2_MAX_PARAM_SIZE]; + } params; + union { + struct ec_response_i2c_passthru r; + uint8_t inbuf[EC_PROTO2_MAX_PARAM_SIZE]; + } response; + struct ec_params_i2c_passthru *p = ¶ms.p; + struct ec_response_i2c_passthru *r = &response.r; + struct ec_params_i2c_passthru_msg *msg; + uint8_t *pdata, *read_ptr = NULL; + int read_len; + int size; + int rv; + int i; + + p->port = port; + + p->num_msgs = nmsgs; + size = sizeof(*p) + p->num_msgs * sizeof(*msg); + + /* Create a message to write the register address and optional data */ + pdata = (uint8_t *)p + size; + + read_len = 0; + for (i = 0, msg = p->msg; i < nmsgs; i++, msg++, in++) { + bool is_read = in->flags & I2C_M_RD; + + msg->addr_flags = in->addr; + msg->len = in->len; + if (is_read) { + msg->addr_flags |= EC_I2C_FLAG_READ; + read_len += in->len; + read_ptr = in->buf; + if (sizeof(*r) + read_len > sizeof(response)) { + puts("Read length too big for buffer\n"); + return -1; + } + } else { + if (pdata - (uint8_t *)p + in->len > sizeof(params)) { + puts("Params too large for buffer\n"); + return -1; + } + memcpy(pdata, in->buf, in->len); + pdata += in->len; + } + } + + rv = ec_command(dev, EC_CMD_I2C_PASSTHRU, 0, p, pdata - (uint8_t *)p, + r, sizeof(*r) + read_len); + if (rv < 0) + return rv; + + /* Parse response */ + if (r->i2c_status & EC_I2C_STATUS_ERROR) { + printf("Transfer failed with status=0x%x\n", r->i2c_status); + return -1; + } + + if (rv < sizeof(*r) + read_len) { + puts("Truncated read response\n"); + return -1; + } + + /* We only support a single read message for each transfer */ + if (read_len) + memcpy(read_ptr, r->data, read_len); + + return 0; +} + +int cros_ec_get_features(struct udevice *dev, u64 *featuresp) +{ + struct ec_response_get_features r; + int rv; + + rv = ec_command(dev, EC_CMD_GET_FEATURES, 0, NULL, 0, &r, sizeof(r)); + if (rv != sizeof(r)) + return -EIO; + *featuresp = r.flags[0] | (u64)r.flags[1] << 32; + + return 0; +} + +int cros_ec_check_feature(struct udevice *dev, uint feature) +{ + struct ec_response_get_features r; + int rv; + + rv = ec_command(dev, EC_CMD_GET_FEATURES, 0, NULL, 0, &r, sizeof(r)); + if (rv != sizeof(r)) + return -EIO; + + if (feature >= 8 * sizeof(r.flags)) + return -EINVAL; + + return r.flags[feature / 32] & EC_FEATURE_MASK_0(feature) ? true : + false; +} + +/* + * Query the EC for specified mask indicating enabled events. + * The EC maintains separate event masks for SMI, SCI and WAKE. + */ +static int cros_ec_uhepi_cmd(struct udevice *dev, uint mask, uint action, + uint64_t *value) +{ + int ret; + struct ec_params_host_event req; + struct ec_response_host_event rsp; + + req.action = action; + req.mask_type = mask; + if (action != EC_HOST_EVENT_GET) + req.value = *value; + else + *value = 0; + ret = ec_command(dev, EC_CMD_HOST_EVENT, 0, &req, sizeof(req), &rsp, + sizeof(rsp)); + + if (action != EC_HOST_EVENT_GET) + return ret; + if (ret == 0) + *value = rsp.value; + + return ret; +} + +static int cros_ec_handle_non_uhepi_cmd(struct udevice *dev, uint hcmd, + uint action, uint64_t *value) +{ + int ret = -1; + struct ec_params_host_event_mask req; + struct ec_response_host_event_mask rsp; + + if (hcmd == INVALID_HCMD) + return ret; + + if (action != EC_HOST_EVENT_GET) + req.mask = (uint32_t)*value; + else + *value = 0; + + ret = ec_command(dev, hcmd, 0, &req, sizeof(req), &rsp, sizeof(rsp)); + if (action != EC_HOST_EVENT_GET) + return ret; + if (ret == 0) + *value = rsp.mask; + + return ret; +} + +bool cros_ec_is_uhepi_supported(struct udevice *dev) +{ +#define UHEPI_SUPPORTED 1 +#define UHEPI_NOT_SUPPORTED 2 + static int uhepi_support; + + if (!uhepi_support) { + uhepi_support = cros_ec_check_feature(dev, + EC_FEATURE_UNIFIED_WAKE_MASKS) > 0 ? UHEPI_SUPPORTED : + UHEPI_NOT_SUPPORTED; + log_debug("Chrome EC: UHEPI %s\n", + uhepi_support == UHEPI_SUPPORTED ? "supported" : + "not supported"); + } + return uhepi_support == UHEPI_SUPPORTED; +} + +static int cros_ec_get_mask(struct udevice *dev, uint type) +{ + u64 value = 0; + + if (cros_ec_is_uhepi_supported(dev)) { + cros_ec_uhepi_cmd(dev, type, EC_HOST_EVENT_GET, &value); + } else { + assert(type < ARRAY_SIZE(event_map)); + cros_ec_handle_non_uhepi_cmd(dev, event_map[type].get_cmd, + EC_HOST_EVENT_GET, &value); + } + return value; +} + +static int cros_ec_clear_mask(struct udevice *dev, uint type, u64 mask) +{ + if (cros_ec_is_uhepi_supported(dev)) + return cros_ec_uhepi_cmd(dev, type, EC_HOST_EVENT_CLEAR, &mask); + + assert(type < ARRAY_SIZE(event_map)); + + return cros_ec_handle_non_uhepi_cmd(dev, event_map[type].clear_cmd, + EC_HOST_EVENT_CLEAR, &mask); +} + +uint64_t cros_ec_get_events_b(struct udevice *dev) +{ + return cros_ec_get_mask(dev, EC_HOST_EVENT_B); +} + +int cros_ec_clear_events_b(struct udevice *dev, uint64_t mask) +{ + log_debug("Chrome EC: clear events_b mask to 0x%016llx\n", mask); + + return cros_ec_clear_mask(dev, EC_HOST_EVENT_B, mask); +} + +int cros_ec_read_limit_power(struct udevice *dev, int *limit_powerp) +{ + struct ec_params_charge_state p; + struct ec_response_charge_state r; + int ret; + + p.cmd = CHARGE_STATE_CMD_GET_PARAM; + p.get_param.param = CS_PARAM_LIMIT_POWER; + ret = ec_command(dev, EC_CMD_CHARGE_STATE, 0, &p, sizeof(p), + &r, sizeof(r)); + + /* + * If our EC doesn't support the LIMIT_POWER parameter, assume that + * LIMIT_POWER is not requested. + */ + if (ret == -EC_RES_INVALID_PARAM || ret == -EC_RES_INVALID_COMMAND) { + log_warning("PARAM_LIMIT_POWER not supported by EC\n"); + return -ENOSYS; + } + + if (ret != sizeof(r.get_param)) + return -EINVAL; + + *limit_powerp = r.get_param.value; + return 0; +} + +int cros_ec_config_powerbtn(struct udevice *dev, uint32_t flags) +{ + struct ec_params_config_power_button params; + int ret; + + params.flags = flags; + ret = ec_command(dev, EC_CMD_CONFIG_POWER_BUTTON, 0, + ¶ms, sizeof(params), NULL, 0); + if (ret < 0) + return ret; + + return 0; +} + +int cros_ec_get_lid_shutdown_mask(struct udevice *dev) +{ + u32 mask; + int ret; + + ret = cros_ec_get_event_mask(dev, EC_CMD_HOST_EVENT_GET_SMI_MASK, + &mask); + if (ret < 0) + return ret; + + return !!(mask & EC_HOST_EVENT_MASK(EC_HOST_EVENT_LID_CLOSED)); +} + +int cros_ec_set_lid_shutdown_mask(struct udevice *dev, int enable) +{ + u32 mask; + int ret; + + ret = cros_ec_get_event_mask(dev, EC_CMD_HOST_EVENT_GET_SMI_MASK, + &mask); + if (ret < 0) + return ret; + + /* Set lid close event state in the EC SMI event mask */ + if (enable) + mask |= EC_HOST_EVENT_MASK(EC_HOST_EVENT_LID_CLOSED); + else + mask &= ~EC_HOST_EVENT_MASK(EC_HOST_EVENT_LID_CLOSED); + + ret = cros_ec_set_event_mask(dev, EC_CMD_HOST_EVENT_SET_SMI_MASK, mask); + if (ret < 0) + return ret; + + printf("EC: %sabled lid close event\n", enable ? "en" : "dis"); + return 0; +} + +int cros_ec_vstore_supported(struct udevice *dev) +{ + return cros_ec_check_feature(dev, EC_FEATURE_VSTORE); +} + +int cros_ec_vstore_info(struct udevice *dev, u32 *lockedp) +{ + struct ec_response_vstore_info *resp; + + if (ec_command_inptr(dev, EC_CMD_VSTORE_INFO, 0, NULL, 0, + (uint8_t **)&resp, sizeof(*resp)) != sizeof(*resp)) + return -EIO; + + if (lockedp) + *lockedp = resp->slot_locked; + + return resp->slot_count; +} + +/* + * cros_ec_vstore_read - Read data from EC vstore slot + * + * @slot: vstore slot to read from + * @data: buffer to store read data, must be EC_VSTORE_SLOT_SIZE bytes + */ +int cros_ec_vstore_read(struct udevice *dev, int slot, uint8_t *data) +{ + struct ec_params_vstore_read req; + struct ec_response_vstore_read *resp; + + req.slot = slot; + if (ec_command_inptr(dev, EC_CMD_VSTORE_READ, 0, &req, sizeof(req), + (uint8_t **)&resp, sizeof(*resp)) != sizeof(*resp)) + return -EIO; + + if (!data || req.slot >= EC_VSTORE_SLOT_MAX) + return -EINVAL; + + memcpy(data, resp->data, sizeof(resp->data)); + + return 0; +} + +/* + * cros_ec_vstore_write - Save data into EC vstore slot + * + * @slot: vstore slot to write into + * @data: data to write + * @size: size of data in bytes + * + * Maximum size of data is EC_VSTORE_SLOT_SIZE. It is the callers + * responsibility to check the number of implemented slots by + * querying the vstore info. + */ +int cros_ec_vstore_write(struct udevice *dev, int slot, const uint8_t *data, + size_t size) +{ + struct ec_params_vstore_write req; + + if (slot >= EC_VSTORE_SLOT_MAX || size > EC_VSTORE_SLOT_SIZE) + return -EINVAL; + + req.slot = slot; + memcpy(req.data, data, size); + + if (ec_command(dev, EC_CMD_VSTORE_WRITE, 0, &req, sizeof(req), NULL, 0)) + return -EIO; + + return 0; +} + +int cros_ec_get_switches(struct udevice *dev) +{ + struct dm_cros_ec_ops *ops; + int ret; + + ops = dm_cros_ec_get_ops(dev); + if (!ops->get_switches) + return -ENOSYS; + + ret = ops->get_switches(dev); + if (ret < 0) + return log_msg_ret("get", ret); + + return ret; +} + +UCLASS_DRIVER(cros_ec) = { + .id = UCLASS_CROS_EC, + .name = "cros-ec", + .per_device_auto = sizeof(struct cros_ec_dev), +#if !CONFIG_IS_ENABLED(OF_PLATDATA) + .post_bind = dm_scan_fdt_dev, +#endif + .flags = DM_UC_FLAG_ALLOC_PRIV_DMA, +}; |