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firmware: coreboot: Only populate devices in coreboot_table_init()

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This function checks the header for sanity, registers a bus, and
populates devices for each coreboot table entry. Let's just populate
devices here and pull the other bits up into the caller so that this
function can be repurposed for pure device creation and registration.

Cc: Wei-Ning Huang <wnhuang@chromium.org>
Cc: Julius Werner <jwerner@chromium.org>
Cc: Brian Norris <briannorris@chromium.org>
Cc: Samuel Holland <samuel@sholland.org>
Suggested-by: Julius Werner <jwerner@chromium.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stephen Boyd 2018-08-15 13:37:08 -07:00 committed by Greg Kroah-Hartman
parent a7d9b5f012
commit 7adb05bb81
1 changed files with 29 additions and 38 deletions
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67
drivers/firmware/google/coreboot_table.c
View File

@ -32,8 +32,6 @@
#define CB_DEV(d) container_of(d, struct coreboot_device, dev) #define CB_DEV(d) container_of(d, struct coreboot_device, dev)
#define CB_DRV(d) container_of(d, struct coreboot_driver, drv) #define CB_DRV(d) container_of(d, struct coreboot_driver, drv)
static struct coreboot_table_header *ptr_header;
static int coreboot_bus_match(struct device *dev, struct device_driver *drv) static int coreboot_bus_match(struct device *dev, struct device_driver *drv)
{ {
struct coreboot_device *device = CB_DEV(dev); struct coreboot_device *device = CB_DEV(dev);
@ -94,36 +92,21 @@ void coreboot_driver_unregister(struct coreboot_driver *driver)
} }
EXPORT_SYMBOL(coreboot_driver_unregister); EXPORT_SYMBOL(coreboot_driver_unregister);
static int coreboot_table_init(struct device *dev, void *ptr) static int coreboot_table_populate(struct device *dev, void *ptr)
{ {
int i, ret; int i, ret;
void *ptr_entry; void *ptr_entry;
struct coreboot_device *device; struct coreboot_device *device;
struct coreboot_table_entry *entry; struct coreboot_table_entry *entry;
struct coreboot_table_header *header; struct coreboot_table_header *header = ptr;
ptr_header = ptr; ptr_entry = ptr + header->header_bytes;
header = ptr;
if (strncmp(header->signature, "LBIO", sizeof(header->signature))) {
pr_warn("coreboot_table: coreboot table missing or corrupt!\n");
ret = -ENODEV;
goto out;
}
ret = bus_register(&coreboot_bus_type);
if (ret)
goto out;
ptr_entry = ptr_header + header->header_bytes;
for (i = 0; i < header->table_entries; i++) { for (i = 0; i < header->table_entries; i++) {
entry = ptr_entry; entry = ptr_entry;
device = kzalloc(sizeof(struct device) + entry->size, GFP_KERNEL); device = kzalloc(sizeof(struct device) + entry->size, GFP_KERNEL);
if (!device) { if (!device)
ret = -ENOMEM; return -ENOMEM;
break;
}
dev_set_name(&device->dev, "coreboot%d", i); dev_set_name(&device->dev, "coreboot%d", i);
device->dev.parent = dev; device->dev.parent = dev;
@ -134,18 +117,13 @@ static int coreboot_table_init(struct device *dev, void *ptr)
ret = device_register(&device->dev); ret = device_register(&device->dev);
if (ret) { if (ret) {
put_device(&device->dev); put_device(&device->dev);
break; return ret;
} }
ptr_entry += entry->size; ptr_entry += entry->size;
} }
if (ret) return 0;
bus_unregister(&coreboot_bus_type);
out:
memunmap(ptr);
return ret;
} }
static int coreboot_table_probe(struct platform_device *pdev) static int coreboot_table_probe(struct platform_device *pdev)
@ -153,7 +131,9 @@ static int coreboot_table_probe(struct platform_device *pdev)
resource_size_t len; resource_size_t len;
struct coreboot_table_header *header; struct coreboot_table_header *header;
struct resource *res; struct resource *res;
struct device *dev = &pdev->dev;
void *ptr; void *ptr;
int ret;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0); res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) if (!res)
@ -163,26 +143,37 @@ static int coreboot_table_probe(struct platform_device *pdev)
if (!res->start || !len) if (!res->start || !len)
return -EINVAL; return -EINVAL;
/* Check just the header first to make sure things are sane */
header = memremap(res->start, sizeof(*header), MEMREMAP_WB); header = memremap(res->start, sizeof(*header), MEMREMAP_WB);
if (header == NULL) if (!header)
return -ENOMEM; return -ENOMEM;
ptr = memremap(res->start, header->header_bytes + header->table_bytes, len = header->header_bytes + header->table_bytes;
MEMREMAP_WB); ret = strncmp(header->signature, "LBIO", sizeof(header->signature));
memunmap(header); memunmap(header);
if (ret) {
dev_warn(dev, "coreboot table missing or corrupt!\n");
return -ENODEV;
}
ptr = memremap(res->start, len, MEMREMAP_WB);
if (!ptr) if (!ptr)
return -ENOMEM; return -ENOMEM;
return coreboot_table_init(&pdev->dev, ptr); ret = bus_register(&coreboot_bus_type);
if (!ret) {
ret = coreboot_table_populate(dev, ptr);
if (ret)
bus_unregister(&coreboot_bus_type);
}
memunmap(ptr);
return ret;
} }
static int coreboot_table_remove(struct platform_device *pdev) static int coreboot_table_remove(struct platform_device *pdev)
{ {
if (ptr_header) { bus_unregister(&coreboot_bus_type);
bus_unregister(&coreboot_bus_type);
ptr_header = NULL;
}
return 0; return 0;
} }