diff options
Diffstat (limited to 'drivers/staging/greybus/firmware.c')
| -rw-r--r-- | drivers/staging/greybus/firmware.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/drivers/staging/greybus/firmware.c b/drivers/staging/greybus/firmware.c new file mode 100644 index 0000000..13efaab --- /dev/null +++ b/drivers/staging/greybus/firmware.c @@ -0,0 +1,199 @@ +/* + * FIRMWARE Greybus driver. + * + * Copyright 2015 Google Inc. + * Copyright 2015 Linaro Ltd. + * + * Released under the GPLv2 only. + */ + +#include <linux/firmware.h> + +#include "greybus.h" + +struct gb_firmware { + struct gb_connection *connection; + const struct firmware *fw; +}; + +static void free_firmware(struct gb_firmware *firmware) +{ + release_firmware(firmware->fw); + firmware->fw = NULL; +} + +/* This returns path of the firmware blob on the disk */ +static int download_firmware(struct gb_firmware *firmware, u8 stage) +{ + struct gb_connection *connection = firmware->connection; + struct gb_interface *intf = connection->bundle->intf; + char firmware_name[28]; + + /* Already have a firmware, free it */ + if (firmware->fw) + free_firmware(firmware); + + /* + * Create firmware name + * + * XXX Name it properly.. + */ + sprintf(firmware_name, "ara:%04x:%04x:%04x:%04x:%04x.fw", intf->unipro_mfg_id, + intf->unipro_prod_id, intf->ara_vend_id, intf->ara_prod_id, + stage); + + return request_firmware(&firmware->fw, firmware_name, &connection->dev); +} + +static int gb_firmware_size_request(struct gb_operation *op) +{ + struct gb_connection *connection = op->connection; + struct gb_firmware *firmware = connection->private; + struct gb_firmware_size_request *size_request = op->request->payload; + struct gb_firmware_size_response *size_response; + struct device *dev = &connection->dev; + int ret; + + if (op->request->payload_size != sizeof(*size_request)) { + dev_err(dev, "%s: illegal size of firmware size request (%zu != %zu)\n", + __func__, op->request->payload_size, + sizeof(*size_request)); + return -EINVAL; + } + + ret = download_firmware(firmware, size_request->stage); + if (ret) { + dev_err(dev, "%s: failed to download firmware (%d)\n", __func__, + ret); + return ret; + } + + if (!gb_operation_response_alloc(op, sizeof(*size_response), + GFP_KERNEL)) { + dev_err(dev, "%s: error allocating response\n", __func__); + free_firmware(firmware); + return -ENOMEM; + } + + size_response = op->response->payload; + size_response->size = cpu_to_le32(firmware->fw->size); + + return 0; +} + +static int gb_firmware_get_firmware(struct gb_operation *op) +{ + struct gb_connection *connection = op->connection; + struct gb_firmware *firmware = connection->private; + struct gb_firmware_get_firmware_request *firmware_request = op->request->payload; + struct gb_firmware_get_firmware_response *firmware_response; + struct device *dev = &connection->dev; + unsigned int offset, size; + + if (op->request->payload_size != sizeof(*firmware_request)) { + dev_err(dev, "%s: Illegal size of get firmware request (%zu %zu)\n", + __func__, op->request->payload_size, + sizeof(*firmware_request)); + return -EINVAL; + } + + if (!firmware->fw) { + dev_err(dev, "%s: firmware not available\n", __func__); + return -EINVAL; + } + + offset = le32_to_cpu(firmware_request->offset); + size = le32_to_cpu(firmware_request->size); + + if (!gb_operation_response_alloc(op, sizeof(*firmware_response) + size, + GFP_KERNEL)) { + dev_err(dev, "%s: error allocating response\n", __func__); + return -ENOMEM; + } + + firmware_response = op->response->payload; + memcpy(firmware_response->data, firmware->fw->data + offset, size); + + return 0; +} + +static int gb_firmware_ready_to_boot(struct gb_operation *op) +{ + struct gb_connection *connection = op->connection; + struct gb_firmware_ready_to_boot_request *rtb_request = op->request->payload; + struct device *dev = &connection->dev; + u8 stage, status; + + if (op->request->payload_size != sizeof(*rtb_request)) { + dev_err(dev, "%s: Illegal size of ready to boot request (%zu %zu)\n", + __func__, op->request->payload_size, + sizeof(*rtb_request)); + return -EINVAL; + } + + stage = rtb_request->stage; + status = rtb_request->status; + + /* Return error if the blob was invalid */ + if (status == GB_FIRMWARE_BOOT_STATUS_INVALID) + return -EINVAL; + + /* + * XXX Should we return error for insecure firmware? + */ + + return 0; +} + +static int gb_firmware_request_recv(u8 type, struct gb_operation *op) +{ + switch (type) { + case GB_FIRMWARE_TYPE_FIRMWARE_SIZE: + return gb_firmware_size_request(op); + case GB_FIRMWARE_TYPE_GET_FIRMWARE: + return gb_firmware_get_firmware(op); + case GB_FIRMWARE_TYPE_READY_TO_BOOT: + return gb_firmware_ready_to_boot(op); + default: + dev_err(&op->connection->dev, + "unsupported request: %hhu\n", type); + return -EINVAL; + } +} + +static int gb_firmware_connection_init(struct gb_connection *connection) +{ + struct gb_firmware *firmware; + + firmware = kzalloc(sizeof(*firmware), GFP_KERNEL); + if (!firmware) + return -ENOMEM; + + firmware->connection = connection; + connection->private = firmware; + + return 0; +} + +static void gb_firmware_connection_exit(struct gb_connection *connection) +{ + struct gb_firmware *firmware = connection->private; + + /* Release firmware */ + if (firmware->fw) + free_firmware(firmware); + + connection->private = NULL; + kfree(firmware); +} + +static struct gb_protocol firmware_protocol = { + .name = "firmware", + .id = GREYBUS_PROTOCOL_FIRMWARE, + .major = GB_FIRMWARE_VERSION_MAJOR, + .minor = GB_FIRMWARE_VERSION_MINOR, + .connection_init = gb_firmware_connection_init, + .connection_exit = gb_firmware_connection_exit, + .request_recv = gb_firmware_request_recv, +}; +gb_builtin_protocol_driver(firmware_protocol); |
