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- // 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,
- };
- #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);
- 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(50); /* Insert some reasonable delay */
- 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_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)) {
- /*
- * 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.
- */
- /*
- * TODO(rspangler@chromium.org): Would be nice if we had a
- * better way to determine when the reboot is complete. Could
- * we poll a memory-mapped LPC value?
- */
- udelay(50000);
- }
- 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 ec_response_hello *resp;
- 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;
- if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req, sizeof(req),
- (uint8_t **)&resp, sizeof(*resp)) > 0)
- return 0;
- /* Try sending a version 2 packet */
- cdev->protocol_version = 2;
- if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req, sizeof(req),
- (uint8_t **)&resp, sizeof(*resp)) > 0)
- 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)
- {
- 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)) < sizeof(*resp)) {
- printf("ec_command_inptr() returned error\n");
- return -1;
- }
- if (resp->out_data != req.in_data + 0x01020304) {
- printf("Received invalid handshake %x\n", resp->out_data);
- return -1;
- }
- 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_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_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_check_feature(struct udevice *dev, int feature)
- {
- struct ec_response_get_features r;
- int rv;
- rv = ec_command(dev, EC_CMD_GET_FEATURES, 0, &r, sizeof(r), NULL, 0);
- if (rv)
- return rv;
- if (feature >= 8 * sizeof(r.flags))
- return -1;
- return r.flags[feature / 32] & EC_FEATURE_MASK_0(feature);
- }
- /*
- * 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;
- }
- UCLASS_DRIVER(cros_ec) = {
- .id = UCLASS_CROS_EC,
- .name = "cros-ec",
- .per_device_auto_alloc_size = sizeof(struct cros_ec_dev),
- .post_bind = dm_scan_fdt_dev,
- .flags = DM_UC_FLAG_ALLOC_PRIV_DMA,
- };
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