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204 lines
4.6 KiB
204 lines
4.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* coreboot_table.c |
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* |
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* Module providing coreboot table access. |
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* |
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* Copyright 2017 Google Inc. |
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* Copyright 2017 Samuel Holland <[email protected]> |
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*/ |
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#include <linux/acpi.h> |
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#include <linux/device.h> |
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#include <linux/err.h> |
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#include <linux/init.h> |
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#include <linux/io.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#include "coreboot_table.h" |
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#define CB_DEV(d) container_of(d, struct coreboot_device, dev) |
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#define CB_DRV(d) container_of(d, struct coreboot_driver, drv) |
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static int coreboot_bus_match(struct device *dev, struct device_driver *drv) |
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{ |
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struct coreboot_device *device = CB_DEV(dev); |
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struct coreboot_driver *driver = CB_DRV(drv); |
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return device->entry.tag == driver->tag; |
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} |
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static int coreboot_bus_probe(struct device *dev) |
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{ |
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int ret = -ENODEV; |
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struct coreboot_device *device = CB_DEV(dev); |
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struct coreboot_driver *driver = CB_DRV(dev->driver); |
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if (driver->probe) |
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ret = driver->probe(device); |
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return ret; |
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} |
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static void coreboot_bus_remove(struct device *dev) |
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{ |
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struct coreboot_device *device = CB_DEV(dev); |
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struct coreboot_driver *driver = CB_DRV(dev->driver); |
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if (driver->remove) |
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driver->remove(device); |
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} |
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static struct bus_type coreboot_bus_type = { |
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.name = "coreboot", |
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.match = coreboot_bus_match, |
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.probe = coreboot_bus_probe, |
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.remove = coreboot_bus_remove, |
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}; |
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static void coreboot_device_release(struct device *dev) |
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{ |
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struct coreboot_device *device = CB_DEV(dev); |
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kfree(device); |
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} |
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int coreboot_driver_register(struct coreboot_driver *driver) |
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{ |
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driver->drv.bus = &coreboot_bus_type; |
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return driver_register(&driver->drv); |
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} |
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EXPORT_SYMBOL(coreboot_driver_register); |
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void coreboot_driver_unregister(struct coreboot_driver *driver) |
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{ |
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driver_unregister(&driver->drv); |
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} |
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EXPORT_SYMBOL(coreboot_driver_unregister); |
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static int coreboot_table_populate(struct device *dev, void *ptr) |
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{ |
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int i, ret; |
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void *ptr_entry; |
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struct coreboot_device *device; |
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struct coreboot_table_entry *entry; |
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struct coreboot_table_header *header = ptr; |
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ptr_entry = ptr + header->header_bytes; |
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for (i = 0; i < header->table_entries; i++) { |
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entry = ptr_entry; |
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device = kzalloc(sizeof(struct device) + entry->size, GFP_KERNEL); |
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if (!device) |
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return -ENOMEM; |
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dev_set_name(&device->dev, "coreboot%d", i); |
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device->dev.parent = dev; |
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device->dev.bus = &coreboot_bus_type; |
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device->dev.release = coreboot_device_release; |
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memcpy(&device->entry, ptr_entry, entry->size); |
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ret = device_register(&device->dev); |
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if (ret) { |
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put_device(&device->dev); |
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return ret; |
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} |
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ptr_entry += entry->size; |
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} |
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return 0; |
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} |
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static int coreboot_table_probe(struct platform_device *pdev) |
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{ |
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resource_size_t len; |
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struct coreboot_table_header *header; |
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struct resource *res; |
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struct device *dev = &pdev->dev; |
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void *ptr; |
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int ret; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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if (!res) |
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return -EINVAL; |
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len = resource_size(res); |
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if (!res->start || !len) |
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return -EINVAL; |
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/* Check just the header first to make sure things are sane */ |
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header = memremap(res->start, sizeof(*header), MEMREMAP_WB); |
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if (!header) |
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return -ENOMEM; |
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len = header->header_bytes + header->table_bytes; |
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ret = strncmp(header->signature, "LBIO", sizeof(header->signature)); |
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memunmap(header); |
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if (ret) { |
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dev_warn(dev, "coreboot table missing or corrupt!\n"); |
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return -ENODEV; |
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} |
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ptr = memremap(res->start, len, MEMREMAP_WB); |
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if (!ptr) |
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return -ENOMEM; |
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ret = bus_register(&coreboot_bus_type); |
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if (!ret) { |
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ret = coreboot_table_populate(dev, ptr); |
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if (ret) |
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bus_unregister(&coreboot_bus_type); |
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} |
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memunmap(ptr); |
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return ret; |
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} |
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static int __cb_dev_unregister(struct device *dev, void *dummy) |
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{ |
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device_unregister(dev); |
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return 0; |
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} |
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static int coreboot_table_remove(struct platform_device *pdev) |
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{ |
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bus_for_each_dev(&coreboot_bus_type, NULL, NULL, __cb_dev_unregister); |
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bus_unregister(&coreboot_bus_type); |
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return 0; |
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} |
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#ifdef CONFIG_ACPI |
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static const struct acpi_device_id cros_coreboot_acpi_match[] = { |
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{ "GOOGCB00", 0 }, |
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{ "BOOT0000", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(acpi, cros_coreboot_acpi_match); |
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#endif |
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#ifdef CONFIG_OF |
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static const struct of_device_id coreboot_of_match[] = { |
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{ .compatible = "coreboot" }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, coreboot_of_match); |
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#endif |
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static struct platform_driver coreboot_table_driver = { |
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.probe = coreboot_table_probe, |
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.remove = coreboot_table_remove, |
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.driver = { |
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.name = "coreboot_table", |
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.acpi_match_table = ACPI_PTR(cros_coreboot_acpi_match), |
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.of_match_table = of_match_ptr(coreboot_of_match), |
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}, |
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}; |
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module_platform_driver(coreboot_table_driver); |
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MODULE_AUTHOR("Google, Inc."); |
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MODULE_LICENSE("GPL");
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