mfd: cros_ec: add proto v3 skeleton
Add support in cros_ec.c to handle EC host command protocol v3. For v3+, probe for maximum shared protocol version and max request, response, and passthrough sizes. For now, this will always fall back to v2, since there is no bus-specific code for handling proto v3 packets. Signed-off-by: Stephen Barber <smbarber@chromium.org> Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Reviewed-by: Gwendal Grignou <gwendal@chromium.org> Tested-by: Gwendal Grignou <gwendal@chromium.org> Tested-by: Heiko Stuebner <heiko@sntech.de> Acked-by: Lee Jones <lee.jones@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Signed-off-by: Lee Jones <lee.jones@linaro.org>
此提交包含在：
Stephen Barber
@@ -215,7 +215,11 @@ static int cros_ec_lpc_probe(struct platform_device *pdev)
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ec_dev->ec_name = pdev->name;
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ec_dev->phys_name = dev_name(dev);
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ec_dev->cmd_xfer = cros_ec_cmd_xfer_lpc;
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ec_dev->pkt_xfer = NULL;
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ec_dev->cmd_readmem = cros_ec_lpc_readmem;
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ec_dev->din_size = sizeof(struct ec_host_response) +
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sizeof(struct ec_response_get_protocol_info);
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ec_dev->dout_size = sizeof(struct ec_host_request);
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ret = cros_ec_register(ec_dev);
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if (ret) {
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@@ -22,51 +22,49 @@
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#define EC_COMMAND_RETRIES 50
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int cros_ec_prepare_tx(struct cros_ec_device *ec_dev,
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struct cros_ec_command *msg)
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static int prepare_packet(struct cros_ec_device *ec_dev,
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struct cros_ec_command *msg)
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{
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uint8_t *out;
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int csum, i;
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struct ec_host_request *request;
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u8 *out;
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int i;
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u8 csum = 0;
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BUG_ON(ec_dev->proto_version != EC_HOST_REQUEST_VERSION);
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BUG_ON(msg->outsize + sizeof(*request) > ec_dev->dout_size);
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BUG_ON(msg->outsize > EC_PROTO2_MAX_PARAM_SIZE);
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out = ec_dev->dout;
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out[0] = EC_CMD_VERSION0 + msg->version;
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out[1] = msg->command;
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out[2] = msg->outsize;
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csum = out[0] + out[1] + out[2];
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request = (struct ec_host_request *)out;
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request->struct_version = EC_HOST_REQUEST_VERSION;
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request->checksum = 0;
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request->command = msg->command;
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request->command_version = msg->version;
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request->reserved = 0;
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request->data_len = msg->outsize;
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for (i = 0; i < sizeof(*request); i++)
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csum += out[i];
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/* Copy data and update checksum */
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memcpy(out + sizeof(*request), msg->data, msg->outsize);
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for (i = 0; i < msg->outsize; i++)
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csum += out[EC_MSG_TX_HEADER_BYTES + i] = msg->data[i];
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out[EC_MSG_TX_HEADER_BYTES + msg->outsize] = (uint8_t)(csum & 0xff);
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csum += msg->data[i];
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return EC_MSG_TX_PROTO_BYTES + msg->outsize;
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request->checksum = -csum;
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return sizeof(*request) + msg->outsize;
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}
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EXPORT_SYMBOL(cros_ec_prepare_tx);
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int cros_ec_check_result(struct cros_ec_device *ec_dev,
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struct cros_ec_command *msg)
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{
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switch (msg->result) {
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case EC_RES_SUCCESS:
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return 0;
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case EC_RES_IN_PROGRESS:
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dev_dbg(ec_dev->dev, "command 0x%02x in progress\n",
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msg->command);
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return -EAGAIN;
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default:
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dev_dbg(ec_dev->dev, "command 0x%02x returned %d\n",
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msg->command, msg->result);
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return 0;
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}
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}
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EXPORT_SYMBOL(cros_ec_check_result);
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int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev,
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struct cros_ec_command *msg)
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static int send_command(struct cros_ec_device *ec_dev,
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struct cros_ec_command *msg)
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{
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int ret;
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mutex_lock(&ec_dev->lock);
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ret = ec_dev->cmd_xfer(ec_dev, msg);
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if (ec_dev->proto_version > 2)
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ret = ec_dev->pkt_xfer(ec_dev, msg);
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else
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ret = ec_dev->cmd_xfer(ec_dev, msg);
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if (msg->result == EC_RES_IN_PROGRESS) {
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int i;
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struct cros_ec_command *status_msg;
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@@ -74,10 +72,8 @@ int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev,
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status_msg = kmalloc(sizeof(*status_msg) + sizeof(*status),
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GFP_KERNEL);
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if (!status_msg) {
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ret = -ENOMEM;
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goto exit;
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}
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if (!status_msg)
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return -ENOMEM;
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status_msg->version = 0;
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status_msg->command = EC_CMD_GET_COMMS_STATUS;
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@@ -107,7 +103,278 @@ int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev,
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kfree(status_msg);
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}
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return ret;
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}
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int cros_ec_prepare_tx(struct cros_ec_device *ec_dev,
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struct cros_ec_command *msg)
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{
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u8 *out;
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u8 csum;
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int i;
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if (ec_dev->proto_version > 2)
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return prepare_packet(ec_dev, msg);
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BUG_ON(msg->outsize > EC_PROTO2_MAX_PARAM_SIZE);
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out = ec_dev->dout;
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out[0] = EC_CMD_VERSION0 + msg->version;
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out[1] = msg->command;
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out[2] = msg->outsize;
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csum = out[0] + out[1] + out[2];
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for (i = 0; i < msg->outsize; i++)
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csum += out[EC_MSG_TX_HEADER_BYTES + i] = msg->data[i];
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out[EC_MSG_TX_HEADER_BYTES + msg->outsize] = csum;
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return EC_MSG_TX_PROTO_BYTES + msg->outsize;
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}
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EXPORT_SYMBOL(cros_ec_prepare_tx);
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int cros_ec_check_result(struct cros_ec_device *ec_dev,
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struct cros_ec_command *msg)
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{
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switch (msg->result) {
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case EC_RES_SUCCESS:
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return 0;
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case EC_RES_IN_PROGRESS:
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dev_dbg(ec_dev->dev, "command 0x%02x in progress\n",
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msg->command);
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return -EAGAIN;
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default:
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dev_dbg(ec_dev->dev, "command 0x%02x returned %d\n",
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msg->command, msg->result);
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return 0;
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}
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}
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EXPORT_SYMBOL(cros_ec_check_result);
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static int cros_ec_host_command_proto_query(struct cros_ec_device *ec_dev,
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int devidx,
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struct cros_ec_command *msg)
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{
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/*
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* Try using v3+ to query for supported protocols. If this
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* command fails, fall back to v2. Returns the highest protocol
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* supported by the EC.
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* Also sets the max request/response/passthru size.
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*/
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int ret;
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if (!ec_dev->pkt_xfer)
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return -EPROTONOSUPPORT;
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memset(msg, 0, sizeof(*msg));
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msg->command = EC_CMD_PASSTHRU_OFFSET(devidx) | EC_CMD_GET_PROTOCOL_INFO;
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msg->insize = sizeof(struct ec_response_get_protocol_info);
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ret = send_command(ec_dev, msg);
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if (ret < 0) {
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dev_dbg(ec_dev->dev,
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"failed to check for EC[%d] protocol version: %d\n",
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devidx, ret);
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return ret;
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}
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if (devidx > 0 && msg->result == EC_RES_INVALID_COMMAND)
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return -ENODEV;
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else if (msg->result != EC_RES_SUCCESS)
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return msg->result;
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return 0;
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}
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static int cros_ec_host_command_proto_query_v2(struct cros_ec_device *ec_dev)
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{
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struct cros_ec_command *msg;
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struct ec_params_hello *hello_params;
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struct ec_response_hello *hello_response;
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int ret;
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int len = max(sizeof(*hello_params), sizeof(*hello_response));
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msg = kmalloc(sizeof(*msg) + len, GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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msg->version = 0;
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msg->command = EC_CMD_HELLO;
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hello_params = (struct ec_params_hello *)msg->data;
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msg->outsize = sizeof(*hello_params);
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hello_response = (struct ec_response_hello *)msg->data;
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msg->insize = sizeof(*hello_response);
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hello_params->in_data = 0xa0b0c0d0;
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ret = send_command(ec_dev, msg);
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if (ret < 0) {
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dev_dbg(ec_dev->dev,
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"EC failed to respond to v2 hello: %d\n",
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ret);
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goto exit;
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} else if (msg->result != EC_RES_SUCCESS) {
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dev_err(ec_dev->dev,
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"EC responded to v2 hello with error: %d\n",
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msg->result);
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ret = msg->result;
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goto exit;
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} else if (hello_response->out_data != 0xa1b2c3d4) {
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dev_err(ec_dev->dev,
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"EC responded to v2 hello with bad result: %u\n",
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hello_response->out_data);
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ret = -EBADMSG;
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goto exit;
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}
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ret = 0;
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exit:
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kfree(msg);
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return ret;
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}
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int cros_ec_query_all(struct cros_ec_device *ec_dev)
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{
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struct device *dev = ec_dev->dev;
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struct cros_ec_command *proto_msg;
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struct ec_response_get_protocol_info *proto_info;
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int ret;
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proto_msg = kzalloc(sizeof(*proto_msg) + sizeof(*proto_info),
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GFP_KERNEL);
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if (!proto_msg)
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return -ENOMEM;
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/* First try sending with proto v3. */
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ec_dev->proto_version = 3;
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ret = cros_ec_host_command_proto_query(ec_dev, 0, proto_msg);
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if (ret == 0) {
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proto_info = (struct ec_response_get_protocol_info *)
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proto_msg->data;
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ec_dev->max_request = proto_info->max_request_packet_size -
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sizeof(struct ec_host_request);
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ec_dev->max_response = proto_info->max_response_packet_size -
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sizeof(struct ec_host_response);
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ec_dev->proto_version =
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min(EC_HOST_REQUEST_VERSION,
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fls(proto_info->protocol_versions) - 1);
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dev_dbg(ec_dev->dev,
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"using proto v%u\n",
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ec_dev->proto_version);
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ec_dev->din_size = ec_dev->max_response +
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sizeof(struct ec_host_response) +
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EC_MAX_RESPONSE_OVERHEAD;
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ec_dev->dout_size = ec_dev->max_request +
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sizeof(struct ec_host_request) +
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EC_MAX_REQUEST_OVERHEAD;
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/*
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* Check for PD
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*/
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ret = cros_ec_host_command_proto_query(ec_dev, 1, proto_msg);
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if (ret) {
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dev_dbg(ec_dev->dev, "no PD chip found: %d\n", ret);
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ec_dev->max_passthru = 0;
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} else {
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dev_dbg(ec_dev->dev, "found PD chip\n");
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ec_dev->max_passthru =
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proto_info->max_request_packet_size -
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sizeof(struct ec_host_request);
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}
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} else {
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/* Try querying with a v2 hello message. */
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ec_dev->proto_version = 2;
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ret = cros_ec_host_command_proto_query_v2(ec_dev);
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if (ret == 0) {
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/* V2 hello succeeded. */
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dev_dbg(ec_dev->dev, "falling back to proto v2\n");
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ec_dev->max_request = EC_PROTO2_MAX_PARAM_SIZE;
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ec_dev->max_response = EC_PROTO2_MAX_PARAM_SIZE;
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ec_dev->max_passthru = 0;
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ec_dev->pkt_xfer = NULL;
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ec_dev->din_size = EC_MSG_BYTES;
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ec_dev->dout_size = EC_MSG_BYTES;
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} else {
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/*
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* It's possible for a test to occur too early when
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* the EC isn't listening. If this happens, we'll
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* test later when the first command is run.
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*/
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ec_dev->proto_version = EC_PROTO_VERSION_UNKNOWN;
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dev_dbg(ec_dev->dev, "EC query failed: %d\n", ret);
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goto exit;
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}
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}
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devm_kfree(dev, ec_dev->din);
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devm_kfree(dev, ec_dev->dout);
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ec_dev->din = devm_kzalloc(dev, ec_dev->din_size, GFP_KERNEL);
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if (!ec_dev->din) {
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ret = -ENOMEM;
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goto exit;
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}
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ec_dev->dout = devm_kzalloc(dev, ec_dev->dout_size, GFP_KERNEL);
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if (!ec_dev->dout) {
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devm_kfree(dev, ec_dev->din);
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ret = -ENOMEM;
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goto exit;
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}
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exit:
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kfree(proto_msg);
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return ret;
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}
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EXPORT_SYMBOL(cros_ec_query_all);
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int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev,
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struct cros_ec_command *msg)
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{
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int ret;
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mutex_lock(&ec_dev->lock);
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if (ec_dev->proto_version == EC_PROTO_VERSION_UNKNOWN) {
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ret = cros_ec_query_all(ec_dev);
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if (ret) {
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dev_err(ec_dev->dev,
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"EC version unknown and query failed; aborting command\n");
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mutex_unlock(&ec_dev->lock);
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return ret;
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}
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}
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if (msg->insize > ec_dev->max_response) {
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dev_dbg(ec_dev->dev, "clamping message receive buffer\n");
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msg->insize = ec_dev->max_response;
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}
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if (msg->command < EC_CMD_PASSTHRU_OFFSET(1)) {
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if (msg->outsize > ec_dev->max_request) {
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dev_err(ec_dev->dev,
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"request of size %u is too big (max: %u)\n",
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msg->outsize,
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ec_dev->max_request);
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mutex_unlock(&ec_dev->lock);
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return -EMSGSIZE;
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}
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} else {
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if (msg->outsize > ec_dev->max_passthru) {
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dev_err(ec_dev->dev,
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"passthru rq of size %u is too big (max: %u)\n",
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msg->outsize,
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ec_dev->max_passthru);
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mutex_unlock(&ec_dev->lock);
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return -EMSGSIZE;
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}
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}
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ret = send_command(ec_dev, msg);
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mutex_unlock(&ec_dev->lock);
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return ret;
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