| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Eric Anholt | 945 | 64.73% | 1 | 4.55% |
| Nicolas Saenz Julienne | 176 | 12.05% | 3 | 13.64% |
| Stefan Wahren | 137 | 9.38% | 4 | 18.18% |
| Maxime Ripard | 102 | 6.99% | 3 | 13.64% |
| James Hughes | 32 | 2.19% | 1 | 4.55% |
| Christophe Jaillet | 26 | 1.78% | 1 | 4.55% |
| Kees Cook | 15 | 1.03% | 1 | 4.55% |
| Andy Shevchenko | 12 | 0.82% | 2 | 9.09% |
| Yang Yingliang | 5 | 0.34% | 1 | 4.55% |
| Linus Torvalds | 4 | 0.27% | 1 | 4.55% |
| Rajan Vaja | 3 | 0.21% | 1 | 4.55% |
| Kieran Bingham | 1 | 0.07% | 1 | 4.55% |
| Wang Qing | 1 | 0.07% | 1 | 4.55% |
| Yuan Can | 1 | 0.07% | 1 | 4.55% |
| Total | 1460 | 22 |
// SPDX-License-Identifier: GPL-2.0 /* * Defines interfaces for interacting with the Raspberry Pi firmware's * property channel. * * Copyright © 2015 Broadcom */ #include <linux/dma-mapping.h> #include <linux/kref.h> #include <linux/mailbox_client.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/slab.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 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; struct kref consumers; }; 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); } unsigned int rpi_firmware_clk_get_max_rate(struct rpi_firmware *fw, unsigned int id) { struct rpi_firmware_clk_rate_request msg = RPI_FIRMWARE_CLK_RATE_REQUEST(id); int ret; ret = rpi_firmware_property(fw, RPI_FIRMWARE_GET_MAX_CLOCK_RATE, &msg, sizeof(msg)); if (ret) /* * If our firmware doesn't support that operation, or fails, we * assume the maximum clock rate is absolute maximum we can * store over our type. */ return UINT_MAX; return le32_to_cpu(msg.rate); } EXPORT_SYMBOL_GPL(rpi_firmware_clk_get_max_rate); static void rpi_firmware_delete(struct kref *kref) { struct rpi_firmware *fw = container_of(kref, struct rpi_firmware, consumers); mbox_free_channel(fw->chan); kfree(fw); } void rpi_firmware_put(struct rpi_firmware *fw) { kref_put(&fw->consumers, rpi_firmware_delete); } EXPORT_SYMBOL_GPL(rpi_firmware_put); static void devm_rpi_firmware_put(void *data) { struct rpi_firmware *fw = data; rpi_firmware_put(fw); } static int rpi_firmware_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct rpi_firmware *fw; /* * Memory will be freed by rpi_firmware_delete() once all users have * released their firmware handles. Don't use devm_kzalloc() here. */ fw = kzalloc(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); kfree(fw); return dev_err_probe(dev, ret, "Failed to get mbox channel\n"); } init_completion(&fw->c); kref_init(&fw->consumers); 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; rpi_firmware_put(fw); return 0; } static const struct of_device_id rpi_firmware_of_match[] = { { .compatible = "raspberrypi,bcm2835-firmware", }, {}, }; MODULE_DEVICE_TABLE(of, rpi_firmware_of_match); struct device_node *rpi_firmware_find_node(void) { return of_find_matching_node(NULL, rpi_firmware_of_match); } EXPORT_SYMBOL_GPL(rpi_firmware_find_node); /** * rpi_firmware_get - Get pointer to rpi_firmware structure. * @firmware_node: Pointer to the firmware Device Tree node. * * The reference to rpi_firmware has to be released with rpi_firmware_put(). * * 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); struct rpi_firmware *fw; if (!pdev) return NULL; fw = platform_get_drvdata(pdev); if (!fw) goto err_put_device; if (!kref_get_unless_zero(&fw->consumers)) goto err_put_device; put_device(&pdev->dev); return fw; err_put_device: put_device(&pdev->dev); return NULL; } EXPORT_SYMBOL_GPL(rpi_firmware_get); /** * devm_rpi_firmware_get - Get pointer to rpi_firmware structure. * @dev: The firmware device structure * @firmware_node: Pointer to the firmware Device Tree node. * * Returns NULL is the firmware device is not ready. */ struct rpi_firmware *devm_rpi_firmware_get(struct device *dev, struct device_node *firmware_node) { struct rpi_firmware *fw; fw = rpi_firmware_get(firmware_node); if (!fw) return NULL; if (devm_add_action_or_reset(dev, devm_rpi_firmware_put, fw)) return NULL; return fw; } EXPORT_SYMBOL_GPL(devm_rpi_firmware_get); 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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