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path: root/drivers/firmware/google/coreboot_table-acpi.c
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Diffstat (limited to 'drivers/firmware/google/coreboot_table-acpi.c')
-rw-r--r--drivers/firmware/google/coreboot_table-acpi.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/drivers/firmware/google/coreboot_table-acpi.c b/drivers/firmware/google/coreboot_table-acpi.c
new file mode 100644
index 000000000000..fb98db2d20e2
--- /dev/null
+++ b/drivers/firmware/google/coreboot_table-acpi.c
@@ -0,0 +1,88 @@
+/*
+ * coreboot_table-acpi.c
+ *
+ * Using ACPI to locate Coreboot table and provide coreboot table access.
+ *
+ * Copyright 2017 Google Inc.
+ *
+ * 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/acpi.h>
+#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/platform_device.h>
+
+#include "coreboot_table.h"
+
+static int coreboot_table_acpi_probe(struct platform_device *pdev)
+{
+ phys_addr_t phyaddr;
+ resource_size_t len;
+ struct coreboot_table_header __iomem *header = NULL;
+ struct resource *res;
+ void __iomem *ptr = NULL;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -EINVAL;
+
+ len = resource_size(res);
+ if (!res->start || !len)
+ return -EINVAL;
+
+ phyaddr = res->start;
+ header = ioremap_cache(phyaddr, sizeof(*header));
+ if (header == NULL)
+ return -ENOMEM;
+
+ ptr = ioremap_cache(phyaddr,
+ header->header_bytes + header->table_bytes);
+ iounmap(header);
+ if (!ptr)
+ return -ENOMEM;
+
+ return coreboot_table_init(ptr);
+}
+
+static int coreboot_table_acpi_remove(struct platform_device *pdev)
+{
+ return coreboot_table_exit();
+}
+
+static const struct acpi_device_id cros_coreboot_acpi_match[] = {
+ { "GOOGCB00", 0 },
+ { "BOOT0000", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, cros_coreboot_acpi_match);
+
+static struct platform_driver coreboot_table_acpi_driver = {
+ .probe = coreboot_table_acpi_probe,
+ .remove = coreboot_table_acpi_remove,
+ .driver = {
+ .name = "coreboot_table_acpi",
+ .acpi_match_table = ACPI_PTR(cros_coreboot_acpi_match),
+ },
+};
+
+static int __init coreboot_table_acpi_init(void)
+{
+ return platform_driver_register(&coreboot_table_acpi_driver);
+}
+
+module_init(coreboot_table_acpi_init);
+
+MODULE_AUTHOR("Google, Inc.");
+MODULE_LICENSE("GPL");