diff options
Diffstat (limited to 'drivers/firmware')
| -rw-r--r-- | drivers/firmware/google/Kconfig | 8 | ||||
| -rw-r--r-- | drivers/firmware/google/Makefile | 1 | ||||
| -rw-r--r-- | drivers/firmware/google/coreboot_table-acpi.c | 2 | ||||
| -rw-r--r-- | drivers/firmware/google/coreboot_table-of.c | 2 | ||||
| -rw-r--r-- | drivers/firmware/google/coreboot_table.c | 130 | ||||
| -rw-r--r-- | drivers/firmware/google/coreboot_table.h | 72 | ||||
| -rw-r--r-- | drivers/firmware/google/framebuffer-coreboot.c | 115 | ||||
| -rw-r--r-- | drivers/firmware/google/memconsole-coreboot.c | 49 | ||||
| -rw-r--r-- | drivers/firmware/google/vpd.c | 43 |
9 files changed, 313 insertions, 109 deletions
diff --git a/drivers/firmware/google/Kconfig b/drivers/firmware/google/Kconfig index f16b381a569c..a456a000048b 100644 --- a/drivers/firmware/google/Kconfig +++ b/drivers/firmware/google/Kconfig @@ -55,6 +55,14 @@ config GOOGLE_MEMCONSOLE_X86_LEGACY the EBDA on Google servers. If found, this log is exported to userland in the file /sys/firmware/log. +config GOOGLE_FRAMEBUFFER_COREBOOT + tristate "Coreboot Framebuffer" + depends on FB_SIMPLE + depends on GOOGLE_COREBOOT_TABLE + help + This option enables the kernel to search for a framebuffer in + the coreboot table. If found, it is registered with simplefb. + config GOOGLE_MEMCONSOLE_COREBOOT tristate "Firmware Memory Console" depends on GOOGLE_COREBOOT_TABLE diff --git a/drivers/firmware/google/Makefile b/drivers/firmware/google/Makefile index dcd3675efcfc..d0b3fba96194 100644 --- a/drivers/firmware/google/Makefile +++ b/drivers/firmware/google/Makefile @@ -4,6 +4,7 @@ obj-$(CONFIG_GOOGLE_SMI) += gsmi.o obj-$(CONFIG_GOOGLE_COREBOOT_TABLE) += coreboot_table.o obj-$(CONFIG_GOOGLE_COREBOOT_TABLE_ACPI) += coreboot_table-acpi.o obj-$(CONFIG_GOOGLE_COREBOOT_TABLE_OF) += coreboot_table-of.o +obj-$(CONFIG_GOOGLE_FRAMEBUFFER_COREBOOT) += framebuffer-coreboot.o obj-$(CONFIG_GOOGLE_MEMCONSOLE) += memconsole.o obj-$(CONFIG_GOOGLE_MEMCONSOLE_COREBOOT) += memconsole-coreboot.o obj-$(CONFIG_GOOGLE_MEMCONSOLE_X86_LEGACY) += memconsole-x86-legacy.o diff --git a/drivers/firmware/google/coreboot_table-acpi.c b/drivers/firmware/google/coreboot_table-acpi.c index fb98db2d20e2..77197fe3d42f 100644 --- a/drivers/firmware/google/coreboot_table-acpi.c +++ b/drivers/firmware/google/coreboot_table-acpi.c @@ -53,7 +53,7 @@ static int coreboot_table_acpi_probe(struct platform_device *pdev) if (!ptr) return -ENOMEM; - return coreboot_table_init(ptr); + return coreboot_table_init(&pdev->dev, ptr); } static int coreboot_table_acpi_remove(struct platform_device *pdev) diff --git a/drivers/firmware/google/coreboot_table-of.c b/drivers/firmware/google/coreboot_table-of.c index 727acdc83e83..f15bf404c579 100644 --- a/drivers/firmware/google/coreboot_table-of.c +++ b/drivers/firmware/google/coreboot_table-of.c @@ -34,7 +34,7 @@ static int coreboot_table_of_probe(struct platform_device *pdev) if (!ptr) return -ENOMEM; - return coreboot_table_init(ptr); + return coreboot_table_init(&pdev->dev, ptr); } static int coreboot_table_of_remove(struct platform_device *pdev) diff --git a/drivers/firmware/google/coreboot_table.c b/drivers/firmware/google/coreboot_table.c index 0019d3ec18dd..19db5709ae28 100644 --- a/drivers/firmware/google/coreboot_table.c +++ b/drivers/firmware/google/coreboot_table.c @@ -4,6 +4,7 @@ * Module providing coreboot table access. * * Copyright 2017 Google Inc. + * Copyright 2017 Samuel Holland <samuel@sholland.org> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License v2.0 as published by @@ -15,37 +16,96 @@ * GNU General Public License for more details. */ +#include <linux/device.h> #include <linux/err.h> #include <linux/init.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> +#include <linux/slab.h> #include "coreboot_table.h" -struct coreboot_table_entry { - u32 tag; - u32 size; -}; +#define CB_DEV(d) container_of(d, struct coreboot_device, dev) +#define CB_DRV(d) container_of(d, struct coreboot_driver, drv) static struct coreboot_table_header __iomem *ptr_header; -/* - * This function parses the coreboot table for an entry that contains the base - * address of the given entry tag. The coreboot table consists of a header - * directly followed by a number of small, variable-sized entries, which each - * contain an identifying tag and their length as the first two fields. - */ -int coreboot_table_find(int tag, void *data, size_t data_size) +static int coreboot_bus_match(struct device *dev, struct device_driver *drv) { - struct coreboot_table_header header; - struct coreboot_table_entry entry; - void *ptr_entry; - int i; + struct coreboot_device *device = CB_DEV(dev); + struct coreboot_driver *driver = CB_DRV(drv); - if (!ptr_header) - return -EPROBE_DEFER; + return device->entry.tag == driver->tag; +} +static int coreboot_bus_probe(struct device *dev) +{ + int ret = -ENODEV; + struct coreboot_device *device = CB_DEV(dev); + struct coreboot_driver *driver = CB_DRV(dev->driver); + + if (driver->probe) + ret = driver->probe(device); + + return ret; +} + +static int coreboot_bus_remove(struct device *dev) +{ + int ret = 0; + struct coreboot_device *device = CB_DEV(dev); + struct coreboot_driver *driver = CB_DRV(dev->driver); + + if (driver->remove) + ret = driver->remove(device); + + return ret; +} + +static struct bus_type coreboot_bus_type = { + .name = "coreboot", + .match = coreboot_bus_match, + .probe = coreboot_bus_probe, + .remove = coreboot_bus_remove, +}; + +static int __init coreboot_bus_init(void) +{ + return bus_register(&coreboot_bus_type); +} +module_init(coreboot_bus_init); + +static void coreboot_device_release(struct device *dev) +{ + struct coreboot_device *device = CB_DEV(dev); + + kfree(device); +} + +int coreboot_driver_register(struct coreboot_driver *driver) +{ + driver->drv.bus = &coreboot_bus_type; + + return driver_register(&driver->drv); +} +EXPORT_SYMBOL(coreboot_driver_register); + +void coreboot_driver_unregister(struct coreboot_driver *driver) +{ + driver_unregister(&driver->drv); +} +EXPORT_SYMBOL(coreboot_driver_unregister); + +int coreboot_table_init(struct device *dev, void __iomem *ptr) +{ + int i, ret; + void *ptr_entry; + struct coreboot_device *device; + struct coreboot_table_entry entry; + struct coreboot_table_header header; + + ptr_header = ptr; memcpy_fromio(&header, ptr_header, sizeof(header)); if (strncmp(header.signature, "LBIO", sizeof(header.signature))) { @@ -54,37 +114,41 @@ int coreboot_table_find(int tag, void *data, size_t data_size) } ptr_entry = (void *)ptr_header + header.header_bytes; - for (i = 0; i < header.table_entries; i++) { memcpy_fromio(&entry, ptr_entry, sizeof(entry)); - if (entry.tag == tag) { - if (data_size < entry.size) - return -EINVAL; - memcpy_fromio(data, ptr_entry, entry.size); + device = kzalloc(sizeof(struct device) + entry.size, GFP_KERNEL); + if (!device) { + ret = -ENOMEM; + break; + } + + dev_set_name(&device->dev, "coreboot%d", i); + device->dev.parent = dev; + device->dev.bus = &coreboot_bus_type; + device->dev.release = coreboot_device_release; + memcpy_fromio(&device->entry, ptr_entry, entry.size); - return 0; + ret = device_register(&device->dev); + if (ret) { + put_device(&device->dev); + break; } ptr_entry += entry.size; } - return -ENOENT; -} -EXPORT_SYMBOL(coreboot_table_find); - -int coreboot_table_init(void __iomem *ptr) -{ - ptr_header = ptr; - - return 0; + return ret; } EXPORT_SYMBOL(coreboot_table_init); int coreboot_table_exit(void) { - if (ptr_header) + if (ptr_header) { + bus_unregister(&coreboot_bus_type); iounmap(ptr_header); + ptr_header = NULL; + } return 0; } diff --git a/drivers/firmware/google/coreboot_table.h b/drivers/firmware/google/coreboot_table.h index 6eff1ae0c5d3..8ad95a94481b 100644 --- a/drivers/firmware/google/coreboot_table.h +++ b/drivers/firmware/google/coreboot_table.h @@ -3,7 +3,9 @@ * * Internal header for coreboot table access. * + * Copyright 2014 Gerd Hoffmann <kraxel@redhat.com> * Copyright 2017 Google Inc. + * Copyright 2017 Samuel Holland <samuel@sholland.org> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License v2.0 as published by @@ -20,14 +22,6 @@ #include <linux/io.h> -/* List of coreboot entry structures that is used */ -struct lb_cbmem_ref { - uint32_t tag; - uint32_t size; - - uint64_t cbmem_addr; -}; - /* Coreboot table header structure */ struct coreboot_table_header { char signature[4]; @@ -38,11 +32,67 @@ struct coreboot_table_header { u32 table_entries; }; -/* Retrieve coreboot table entry with tag *tag* and copy it to data */ -int coreboot_table_find(int tag, void *data, size_t data_size); +/* List of coreboot entry structures that is used */ +/* Generic */ +struct coreboot_table_entry { + u32 tag; + u32 size; +}; + +/* Points to a CBMEM entry */ +struct lb_cbmem_ref { + u32 tag; + u32 size; + + u64 cbmem_addr; +}; + +/* Describes framebuffer setup by coreboot */ +struct lb_framebuffer { + u32 tag; + u32 size; + + u64 physical_address; + u32 x_resolution; + u32 y_resolution; + u32 bytes_per_line; + u8 bits_per_pixel; + u8 red_mask_pos; + u8 red_mask_size; + u8 green_mask_pos; + u8 green_mask_size; + u8 blue_mask_pos; + u8 blue_mask_size; + u8 reserved_mask_pos; + u8 reserved_mask_size; +}; + +/* A device, additionally with information from coreboot. */ +struct coreboot_device { + struct device dev; + union { + struct coreboot_table_entry entry; + struct lb_cbmem_ref cbmem_ref; + struct lb_framebuffer framebuffer; + }; +}; + +/* A driver for handling devices described in coreboot tables. */ +struct coreboot_driver { + int (*probe)(struct coreboot_device *); + int (*remove)(struct coreboot_device *); + struct device_driver drv; + u32 tag; +}; + +/* Register a driver that uses the data from a coreboot table. */ +int coreboot_driver_register(struct coreboot_driver *driver); + +/* Unregister a driver that uses the data from a coreboot table. */ +void coreboot_driver_unregister(struct coreboot_driver *driver); /* Initialize coreboot table module given a pointer to iomem */ -int coreboot_table_init(void __iomem *ptr); +int coreboot_table_init(struct device *dev, void __iomem *ptr); /* Cleanup coreboot table module */ int coreboot_table_exit(void); diff --git a/drivers/firmware/google/framebuffer-coreboot.c b/drivers/firmware/google/framebuffer-coreboot.c new file mode 100644 index 000000000000..b8b49c067157 --- /dev/null +++ b/drivers/firmware/google/framebuffer-coreboot.c @@ -0,0 +1,115 @@ +/* + * framebuffer-coreboot.c + * + * Memory based framebuffer accessed through coreboot table. + * + * Copyright 2012-2013 David Herrmann <dh.herrmann@gmail.com> + * Copyright 2017 Google Inc. + * Copyright 2017 Samuel Holland <samuel@sholland.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License v2.0 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/platform_data/simplefb.h> +#include <linux/platform_device.h> + +#include "coreboot_table.h" + +#define CB_TAG_FRAMEBUFFER 0x12 + +static const struct simplefb_format formats[] = SIMPLEFB_FORMATS; + +static int framebuffer_probe(struct coreboot_device *dev) +{ + int i; + u32 length; + struct lb_framebuffer *fb = &dev->framebuffer; + struct platform_device *pdev; + struct resource res; + struct simplefb_platform_data pdata = { + .width = fb->x_resolution, + .height = fb->y_resolution, + .stride = fb->bytes_per_line, + .format = NULL, + }; + + for (i = 0; i < ARRAY_SIZE(formats); ++i) { + if (fb->bits_per_pixel == formats[i].bits_per_pixel && + fb->red_mask_pos == formats[i].red.offset && + fb->red_mask_size == formats[i].red.length && + fb->green_mask_pos == formats[i].green.offset && + fb->green_mask_size == formats[i].green.length && + fb->blue_mask_pos == formats[i].blue.offset && + fb->blue_mask_size == formats[i].blue.length && + fb->reserved_mask_pos == formats[i].transp.offset && + fb->reserved_mask_size == formats[i].transp.length) + pdata.format = formats[i].name; + } + if (!pdata.format) + return -ENODEV; + + memset(&res, 0, sizeof(res)); + res.flags = IORESOURCE_MEM | IORESOURCE_BUSY; + res.name = "Coreboot Framebuffer"; + res.start = fb->physical_address; + length = PAGE_ALIGN(fb->y_resolution * fb->bytes_per_line); + res.end = res.start + length - 1; + if (res.end <= res.start) + return -EINVAL; + + pdev = platform_device_register_resndata(&dev->dev, + "simple-framebuffer", 0, + &res, 1, &pdata, + sizeof(pdata)); + if (IS_ERR(pdev)) + pr_warn("coreboot: could not register framebuffer\n"); + else + dev_set_drvdata(&dev->dev, pdev); + + return PTR_ERR_OR_ZERO(pdev); +} + +static int framebuffer_remove(struct coreboot_device *dev) +{ + struct platform_device *pdev = dev_get_drvdata(&dev->dev); + + platform_device_unregister(pdev); + + return 0; +} + +static struct coreboot_driver framebuffer_driver = { + .probe = framebuffer_probe, + .remove = framebuffer_remove, + .drv = { + .name = "framebuffer", + }, + .tag = CB_TAG_FRAMEBUFFER, +}; + +static int __init coreboot_framebuffer_init(void) +{ + return coreboot_driver_register(&framebuffer_driver); +} + +static void coreboot_framebuffer_exit(void) +{ + coreboot_driver_unregister(&framebuffer_driver); +} + +module_init(coreboot_framebuffer_init); +module_exit(coreboot_framebuffer_exit); + +MODULE_AUTHOR("Samuel Holland <samuel@sholland.org>"); +MODULE_LICENSE("GPL"); diff --git a/drivers/firmware/google/memconsole-coreboot.c b/drivers/firmware/google/memconsole-coreboot.c index 52738887735c..b29e10757bfb 100644 --- a/drivers/firmware/google/memconsole-coreboot.c +++ b/drivers/firmware/google/memconsole-coreboot.c @@ -15,9 +15,9 @@ * GNU General Public License for more details. */ +#include <linux/device.h> #include <linux/kernel.h> #include <linux/module.h> -#include <linux/platform_device.h> #include "memconsole.h" #include "coreboot_table.h" @@ -73,18 +73,19 @@ static ssize_t memconsole_coreboot_read(char *buf, loff_t pos, size_t count) return done; } -static int memconsole_coreboot_init(phys_addr_t physaddr) +static int memconsole_probe(struct coreboot_device *dev) { struct cbmem_cons __iomem *tmp_cbmc; - tmp_cbmc = memremap(physaddr, sizeof(*tmp_cbmc), MEMREMAP_WB); + tmp_cbmc = memremap(dev->cbmem_ref.cbmem_addr, + sizeof(*tmp_cbmc), MEMREMAP_WB); if (!tmp_cbmc) return -ENOMEM; /* Read size only once to prevent overrun attack through /dev/mem. */ cbmem_console_size = tmp_cbmc->size_dont_access_after_boot; - cbmem_console = memremap(physaddr, + cbmem_console = memremap(dev->cbmem_ref.cbmem_addr, cbmem_console_size + sizeof(*cbmem_console), MEMREMAP_WB); memunmap(tmp_cbmc); @@ -93,26 +94,11 @@ static int memconsole_coreboot_init(phys_addr_t physaddr) return -ENOMEM; memconsole_setup(memconsole_coreboot_read); - return 0; -} - -static int memconsole_probe(struct platform_device *pdev) -{ - int ret; - struct lb_cbmem_ref entry; - - ret = coreboot_table_find(CB_TAG_CBMEM_CONSOLE, &entry, sizeof(entry)); - if (ret) - return ret; - - ret = memconsole_coreboot_init(entry.cbmem_addr); - if (ret) - return ret; return memconsole_sysfs_init(); } -static int memconsole_remove(struct platform_device *pdev) +static int memconsole_remove(struct coreboot_device *dev) { memconsole_exit(); @@ -122,28 +108,27 @@ static int memconsole_remove(struct platform_device *pdev) return 0; } -static struct platform_driver memconsole_driver = { +static struct coreboot_driver memconsole_driver = { .probe = memconsole_probe, .remove = memconsole_remove, - .driver = { + .drv = { .name = "memconsole", }, + .tag = CB_TAG_CBMEM_CONSOLE, }; -static int __init platform_memconsole_init(void) +static void coreboot_memconsole_exit(void) { - struct platform_device *pdev; - - pdev = platform_device_register_simple("memconsole", -1, NULL, 0); - if (IS_ERR(pdev)) - return PTR_ERR(pdev); - - platform_driver_register(&memconsole_driver); + coreboot_driver_unregister(&memconsole_driver); +} - return 0; +static int __init coreboot_memconsole_init(void) +{ + return coreboot_driver_register(&memconsole_driver); } -module_init(platform_memconsole_init); +module_exit(coreboot_memconsole_exit); +module_init(coreboot_memconsole_init); MODULE_AUTHOR("Google, Inc."); MODULE_LICENSE("GPL"); diff --git a/drivers/firmware/google/vpd.c b/drivers/firmware/google/vpd.c index e4b40f2b4627..e9db895916c3 100644 --- a/drivers/firmware/google/vpd.c +++ b/drivers/firmware/google/vpd.c @@ -286,20 +286,15 @@ static int vpd_sections_init(phys_addr_t physaddr) return 0; } -static int vpd_probe(struct platform_device *pdev) +static int vpd_probe(struct coreboot_device *dev) { int ret; - struct lb_cbmem_ref entry; - - ret = coreboot_table_find(CB_TAG_VPD, &entry, sizeof(entry)); - if (ret) - return ret; vpd_kobj = kobject_create_and_add("vpd", firmware_kobj); if (!vpd_kobj) return -ENOMEM; - ret = vpd_sections_init(entry.cbmem_addr); + ret = vpd_sections_init(dev->cbmem_ref.cbmem_addr); if (ret) { kobject_put(vpd_kobj); return ret; @@ -308,7 +303,7 @@ static int vpd_probe(struct platform_device *pdev) return 0; } -static int vpd_remove(struct platform_device *pdev) +static int vpd_remove(struct coreboot_device *dev) { vpd_section_destroy(&ro_vpd); vpd_section_destroy(&rw_vpd); @@ -318,41 +313,27 @@ static int vpd_remove(struct platform_device *pdev) return 0; } -static struct platform_driver vpd_driver = { +static struct coreboot_driver vpd_driver = { .probe = vpd_probe, .remove = vpd_remove, - .driver = { + .drv = { .name = "vpd", }, + .tag = CB_TAG_VPD, }; -static struct platform_device *vpd_pdev; - -static int __init vpd_platform_init(void) +static int __init coreboot_vpd_init(void) { - int ret; - - ret = platform_driver_register(&vpd_driver); - if (ret) - return ret; - - vpd_pdev = platform_device_register_simple("vpd", -1, NULL, 0); - if (IS_ERR(vpd_pdev)) { - platform_driver_unregister(&vpd_driver); - return PTR_ERR(vpd_pdev); - } - - return 0; + return coreboot_driver_register(&vpd_driver); } -static void __exit vpd_platform_exit(void) +static void __exit coreboot_vpd_exit(void) { - platform_device_unregister(vpd_pdev); - platform_driver_unregister(&vpd_driver); + coreboot_driver_unregister(&vpd_driver); } -module_init(vpd_platform_init); -module_exit(vpd_platform_exit); +module_init(coreboot_vpd_init); +module_exit(coreboot_vpd_exit); MODULE_AUTHOR("Google, Inc."); MODULE_LICENSE("GPL"); |