2  * Defines interfaces for interacting wtih the Raspberry Pi firmware's
12 #include <linux/dma-mapping.h>
18 #include <soc/bcm2835/raspberrypi-firmware.h>
39 	complete(&fw->c);  in response_callback()
43  * Sends a request to the firmware through the BCM2835 mailbox driver,
55 	reinit_completion(&fw->c);  in rpi_firmware_transaction()
56 	ret = mbox_send_message(fw->chan, &message);  in rpi_firmware_transaction()
58 		wait_for_completion(&fw->c);  in rpi_firmware_transaction()
61 		dev_err(fw->cl.dev, "mbox_send_message returned %d\n", ret);  in rpi_firmware_transaction()
69  * rpi_firmware_property_list - Submit firmware property list
70  * @fw:		Pointer to firmware structure from rpi_firmware_get().
74  * Submits a set of concatenated tags to the VPU firmware through the
79  * See struct rpi_firmware_property_tag_header for the per-tag
92 		return -EINVAL;  in rpi_firmware_property_list()
94 	buf = dma_alloc_coherent(fw->cl.dev, PAGE_ALIGN(size), &bus_addr,  in rpi_firmware_property_list()
97 		return -ENOMEM;  in rpi_firmware_property_list()
99 	/* The firmware will error out without parsing in this case. */  in rpi_firmware_property_list()
105 	buf[size / 4 - 1] = RPI_FIRMWARE_PROPERTY_END;  in rpi_firmware_property_list()
116 		 * But single-tag is the most common, so go with it.  in rpi_firmware_property_list()
118 		dev_err(fw->cl.dev, "Request 0x%08x returned status 0x%08x\n",  in rpi_firmware_property_list()
120 		ret = -EINVAL;  in rpi_firmware_property_list()
123 	dma_free_coherent(fw->cl.dev, PAGE_ALIGN(size), buf, bus_addr);  in rpi_firmware_property_list()
130  * rpi_firmware_property - Submit single firmware property
131  * @fw:		Pointer to firmware structure from rpi_firmware_get().
136  * Submits a single tag to the VPU firmware through the mailbox
157 		return -ENOMEM;  in rpi_firmware_property()
160 	header->tag = tag;  in rpi_firmware_property()
161 	header->buf_size = buf_size;  in rpi_firmware_property()
162 	header->req_resp_size = 0;  in rpi_firmware_property()
188 		dev_info(fw->cl.dev,  in rpi_firmware_print_firmware_revision()
189 			 "Attached to firmware from %04ld-%02d-%02d %02d:%02d\n",  in rpi_firmware_print_firmware_revision()
205 	rpi_hwmon = platform_device_register_data(dev, "raspberrypi-hwmon",  in rpi_register_hwmon_driver()
206 						  -1, NULL, 0);  in rpi_register_hwmon_driver()
211 	struct device *dev = &pdev->dev;  in rpi_firmware_probe()
216 		return -ENOMEM;  in rpi_firmware_probe()
218 	fw->cl.dev = dev;  in rpi_firmware_probe()
219 	fw->cl.rx_callback = response_callback;  in rpi_firmware_probe()
220 	fw->cl.tx_block = true;  in rpi_firmware_probe()
222 	fw->chan = mbox_request_channel(&fw->cl, 0);  in rpi_firmware_probe()
223 	if (IS_ERR(fw->chan)) {  in rpi_firmware_probe()
224 		int ret = PTR_ERR(fw->chan);  in rpi_firmware_probe()
225 		if (ret != -EPROBE_DEFER)  in rpi_firmware_probe()
230 	init_completion(&fw->c);  in rpi_firmware_probe()
246 	mbox_free_channel(fw->chan);  in rpi_firmware_remove()
252  * rpi_firmware_get - Get pointer to rpi_firmware structure.
253  * @firmware_node:    Pointer to the firmware Device Tree node.
255  * Returns NULL is the firmware device is not ready.
269 	{ .compatible = "raspberrypi,bcm2835-firmware", },
276 		.name = "raspberrypi-firmware",
285 MODULE_DESCRIPTION("Raspberry Pi firmware driver");