| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Eric Anholt | 882 | 65.28% | 1 | 8.33% |
| Nicolas Saenz Julienne | 233 | 17.25% | 2 | 16.67% |
| Stefan Wahren | 148 | 10.95% | 4 | 33.33% |
| James Hughes | 32 | 2.37% | 1 | 8.33% |
| Maxime Ripard | 29 | 2.15% | 1 | 8.33% |
| Kees Cook | 15 | 1.11% | 1 | 8.33% |
| Andy Shevchenko | 12 | 0.89% | 2 | 16.67% |
| Total | 1351 | 12 |
// SPDX-License-Identifier: GPL-2.0 /* * Defines interfaces for interacting wtih the Raspberry Pi firmware's * property channel. * * Copyright © 2015 Broadcom */ #include <linux/dma-mapping.h> #include <linux/mailbox_client.h> #include <linux/module.h> #include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/pci.h> #include <linux/delay.h> #include <soc/bcm2835/raspberrypi-firmware.h> #define MBOX_MSG(chan, data28) (((data28) & ~0xf) | ((chan) & 0xf)) #define MBOX_CHAN(msg) ((msg) & 0xf) #define MBOX_DATA28(msg) ((msg) & ~0xf) #define MBOX_CHAN_PROPERTY 8 #define VL805_PCI_CONFIG_VERSION_OFFSET 0x50 static struct platform_device *rpi_hwmon; static struct platform_device *rpi_clk; struct rpi_firmware { struct mbox_client cl; struct mbox_chan *chan; /* The property channel. */ struct completion c; u32 enabled; }; static DEFINE_MUTEX(transaction_lock); static void response_callback(struct mbox_client *cl, void *msg) { struct rpi_firmware *fw = container_of(cl, struct rpi_firmware, cl); complete(&fw->c); } /* * Sends a request to the firmware through the BCM2835 mailbox driver, * and synchronously waits for the reply. */ static int rpi_firmware_transaction(struct rpi_firmware *fw, u32 chan, u32 data) { u32 message = MBOX_MSG(chan, data); int ret; WARN_ON(data & 0xf); mutex_lock(&transaction_lock); reinit_completion(&fw->c); ret = mbox_send_message(fw->chan, &message); if (ret >= 0) { if (wait_for_completion_timeout(&fw->c, HZ)) { ret = 0; } else { ret = -ETIMEDOUT; WARN_ONCE(1, "Firmware transaction timeout"); } } else { dev_err(fw->cl.dev, "mbox_send_message returned %d\n", ret); } mutex_unlock(&transaction_lock); return ret; } /** * rpi_firmware_property_list - Submit firmware property list * @fw: Pointer to firmware structure from rpi_firmware_get(). * @data: Buffer holding tags. * @tag_size: Size of tags buffer. * * Submits a set of concatenated tags to the VPU firmware through the * mailbox property interface. * * The buffer header and the ending tag are added by this function and * don't need to be supplied, just the actual tags for your operation. * See struct rpi_firmware_property_tag_header for the per-tag * structure. */ int rpi_firmware_property_list(struct rpi_firmware *fw, void *data, size_t tag_size) { size_t size = tag_size + 12; u32 *buf; dma_addr_t bus_addr; int ret; /* Packets are processed a dword at a time. */ if (size & 3) return -EINVAL; buf = dma_alloc_coherent(fw->cl.dev, PAGE_ALIGN(size), &bus_addr, GFP_ATOMIC); if (!buf) return -ENOMEM; /* The firmware will error out without parsing in this case. */ WARN_ON(size >= 1024 * 1024); buf[0] = size; buf[1] = RPI_FIRMWARE_STATUS_REQUEST; memcpy(&buf[2], data, tag_size); buf[size / 4 - 1] = RPI_FIRMWARE_PROPERTY_END; wmb(); ret = rpi_firmware_transaction(fw, MBOX_CHAN_PROPERTY, bus_addr); rmb(); memcpy(data, &buf[2], tag_size); if (ret == 0 && buf[1] != RPI_FIRMWARE_STATUS_SUCCESS) { /* * The tag name here might not be the one causing the * error, if there were multiple tags in the request. * But single-tag is the most common, so go with it. */ dev_err(fw->cl.dev, "Request 0x%08x returned status 0x%08x\n", buf[2], buf[1]); ret = -EINVAL; } dma_free_coherent(fw->cl.dev, PAGE_ALIGN(size), buf, bus_addr); return ret; } EXPORT_SYMBOL_GPL(rpi_firmware_property_list); /** * rpi_firmware_property - Submit single firmware property * @fw: Pointer to firmware structure from rpi_firmware_get(). * @tag: One of enum_mbox_property_tag. * @tag_data: Tag data buffer. * @buf_size: Buffer size. * * Submits a single tag to the VPU firmware through the mailbox * property interface. * * This is a convenience wrapper around * rpi_firmware_property_list() to avoid some of the * boilerplate in property calls. */ int rpi_firmware_property(struct rpi_firmware *fw, u32 tag, void *tag_data, size_t buf_size) { struct rpi_firmware_property_tag_header *header; int ret; /* Some mailboxes can use over 1k bytes. Rather than checking * size and using stack or kmalloc depending on requirements, * just use kmalloc. Mailboxes don't get called enough to worry * too much about the time taken in the allocation. */ void *data = kmalloc(sizeof(*header) + buf_size, GFP_KERNEL); if (!data) return -ENOMEM; header = data; header->tag = tag; header->buf_size = buf_size; header->req_resp_size = 0; memcpy(data + sizeof(*header), tag_data, buf_size); ret = rpi_firmware_property_list(fw, data, buf_size + sizeof(*header)); memcpy(tag_data, data + sizeof(*header), buf_size); kfree(data); return ret; } EXPORT_SYMBOL_GPL(rpi_firmware_property); static void rpi_firmware_print_firmware_revision(struct rpi_firmware *fw) { time64_t date_and_time; u32 packet; int ret = rpi_firmware_property(fw, RPI_FIRMWARE_GET_FIRMWARE_REVISION, &packet, sizeof(packet)); if (ret) return; /* This is not compatible with y2038 */ date_and_time = packet; dev_info(fw->cl.dev, "Attached to firmware from %ptT\n", &date_and_time); } static void rpi_register_hwmon_driver(struct device *dev, struct rpi_firmware *fw) { u32 packet; int ret = rpi_firmware_property(fw, RPI_FIRMWARE_GET_THROTTLED, &packet, sizeof(packet)); if (ret) return; rpi_hwmon = platform_device_register_data(dev, "raspberrypi-hwmon", -1, NULL, 0); } static void rpi_register_clk_driver(struct device *dev) { struct device_node *firmware; /* * Earlier DTs don't have a node for the firmware clocks but * rely on us creating a platform device by hand. If we do * have a node for the firmware clocks, just bail out here. */ firmware = of_get_compatible_child(dev->of_node, "raspberrypi,firmware-clocks"); if (firmware) { of_node_put(firmware); return; } rpi_clk = platform_device_register_data(dev, "raspberrypi-clk", -1, NULL, 0); } static int rpi_firmware_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct rpi_firmware *fw; fw = devm_kzalloc(dev, sizeof(*fw), GFP_KERNEL); if (!fw) return -ENOMEM; fw->cl.dev = dev; fw->cl.rx_callback = response_callback; fw->cl.tx_block = true; fw->chan = mbox_request_channel(&fw->cl, 0); if (IS_ERR(fw->chan)) { int ret = PTR_ERR(fw->chan); if (ret != -EPROBE_DEFER) dev_err(dev, "Failed to get mbox channel: %d\n", ret); return ret; } init_completion(&fw->c); platform_set_drvdata(pdev, fw); rpi_firmware_print_firmware_revision(fw); rpi_register_hwmon_driver(dev, fw); rpi_register_clk_driver(dev); return 0; } static void rpi_firmware_shutdown(struct platform_device *pdev) { struct rpi_firmware *fw = platform_get_drvdata(pdev); if (!fw) return; rpi_firmware_property(fw, RPI_FIRMWARE_NOTIFY_REBOOT, NULL, 0); } static int rpi_firmware_remove(struct platform_device *pdev) { struct rpi_firmware *fw = platform_get_drvdata(pdev); platform_device_unregister(rpi_hwmon); rpi_hwmon = NULL; platform_device_unregister(rpi_clk); rpi_clk = NULL; mbox_free_channel(fw->chan); return 0; } /** * rpi_firmware_get - Get pointer to rpi_firmware structure. * @firmware_node: Pointer to the firmware Device Tree node. * * Returns NULL is the firmware device is not ready. */ struct rpi_firmware *rpi_firmware_get(struct device_node *firmware_node) { struct platform_device *pdev = of_find_device_by_node(firmware_node); if (!pdev) return NULL; return platform_get_drvdata(pdev); } EXPORT_SYMBOL_GPL(rpi_firmware_get); /* * The Raspberry Pi 4 gets its USB functionality from VL805, a PCIe chip that * implements xHCI. After a PCI reset, VL805's firmware may either be loaded * directly from an EEPROM or, if not present, by the SoC's co-processor, * VideoCore. RPi4's VideoCore OS contains both the non public firmware load * logic and the VL805 firmware blob. This function triggers the aforementioned * process. */ int rpi_firmware_init_vl805(struct pci_dev *pdev) { struct device_node *fw_np; struct rpi_firmware *fw; u32 dev_addr, version; int ret; fw_np = of_find_compatible_node(NULL, NULL, "raspberrypi,bcm2835-firmware"); if (!fw_np) return 0; fw = rpi_firmware_get(fw_np); of_node_put(fw_np); if (!fw) return -ENODEV; /* * Make sure we don't trigger a firmware load unnecessarily. * * If something went wrong with PCI, this whole exercise would be * futile as VideoCore expects from us a configured PCI bus. Just take * the faulty version (likely ~0) and let xHCI's registration fail * further down the line. */ pci_read_config_dword(pdev, VL805_PCI_CONFIG_VERSION_OFFSET, &version); if (version) goto exit; dev_addr = pdev->bus->number << 20 | PCI_SLOT(pdev->devfn) << 15 | PCI_FUNC(pdev->devfn) << 12; ret = rpi_firmware_property(fw, RPI_FIRMWARE_NOTIFY_XHCI_RESET, &dev_addr, sizeof(dev_addr)); if (ret) return ret; /* Wait for vl805 to startup */ usleep_range(200, 1000); pci_read_config_dword(pdev, VL805_PCI_CONFIG_VERSION_OFFSET, &version); exit: pci_info(pdev, "VL805 firmware version %08x\n", version); return 0; } EXPORT_SYMBOL_GPL(rpi_firmware_init_vl805); static const struct of_device_id rpi_firmware_of_match[] = { { .compatible = "raspberrypi,bcm2835-firmware", }, {}, }; MODULE_DEVICE_TABLE(of, rpi_firmware_of_match); static struct platform_driver rpi_firmware_driver = { .driver = { .name = "raspberrypi-firmware", .of_match_table = rpi_firmware_of_match, }, .probe = rpi_firmware_probe, .shutdown = rpi_firmware_shutdown, .remove = rpi_firmware_remove, }; module_platform_driver(rpi_firmware_driver); MODULE_AUTHOR("Eric Anholt <eric@anholt.net>"); MODULE_DESCRIPTION("Raspberry Pi firmware driver"); MODULE_LICENSE("GPL v2");
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