1 files changed, 177 insertions, 0 deletions
diff --git a/drivers/acpi/motherboard.c b/drivers/acpi/motherboard.c
new file mode 100644
index 0000000..61ea707
--- /dev/null
+++ b/drivers/acpi/motherboard.c
@@ -0,0 +1,177 @@
+/* 
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or (at
+ *  your option) any later version.
+ *
+ *  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.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+/* Purpose: Prevent PCMCIA cards from using motherboard resources. */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/ioport.h>
+#include <asm/io.h>
+
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+
+#define _COMPONENT		ACPI_SYSTEM_COMPONENT
+ACPI_MODULE_NAME		("acpi_motherboard")
+
+/* Dell use PNP0C01 instead of PNP0C02 */
+#define ACPI_MB_HID1			"PNP0C01"
+#define ACPI_MB_HID2			"PNP0C02"
+
+/**
+ * Doesn't care about legacy IO ports, only IO ports beyond 0x1000 are reserved
+ * Doesn't care about the failure of 'request_region', since other may reserve 
+ * the io ports as well
+ */
+#define IS_RESERVED_ADDR(base, len) \
+	(((len) > 0) && ((base) > 0) && ((base) + (len) < IO_SPACE_LIMIT) \
+	&& ((base) + (len) > PCIBIOS_MIN_IO))
+
+/*
+ * Clearing the flag (IORESOURCE_BUSY) allows drivers to use
+ * the io ports if they really know they can use it, while
+ * still preventing hotplug PCI devices from using it. 
+ */
+
+static acpi_status
+acpi_reserve_io_ranges (struct acpi_resource *res, void *data)
+{
+	struct resource *requested_res = NULL;
+
+	ACPI_FUNCTION_TRACE("acpi_reserve_io_ranges");
+
+	if (res->id == ACPI_RSTYPE_IO) {
+		struct acpi_resource_io *io_res = &res->data.io;
+
+		if (io_res->min_base_address != io_res->max_base_address)
+			return_VALUE(AE_OK);
+		if (IS_RESERVED_ADDR(io_res->min_base_address, io_res->range_length)) {
+			ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Motherboard resources 0x%08x - 0x%08x\n",
+				io_res->min_base_address, 
+				io_res->min_base_address + io_res->range_length));
+			requested_res = request_region(io_res->min_base_address, 
+				io_res->range_length, "motherboard");
+		}
+	} else if (res->id == ACPI_RSTYPE_FIXED_IO) {
+		struct acpi_resource_fixed_io *fixed_io_res = &res->data.fixed_io;
+
+		if (IS_RESERVED_ADDR(fixed_io_res->base_address, fixed_io_res->range_length)) {
+			ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Motherboard resources 0x%08x - 0x%08x\n",
+				fixed_io_res->base_address, 
+				fixed_io_res->base_address + fixed_io_res->range_length));
+			requested_res = request_region(fixed_io_res->base_address, 
+				fixed_io_res->range_length, "motherboard");
+		}
+	} else {
+		/* Memory mapped IO? */
+	}
+
+	if (requested_res)
+		requested_res->flags &= ~IORESOURCE_BUSY;
+	return_VALUE(AE_OK);
+}
+
+static int acpi_motherboard_add (struct acpi_device *device)
+{
+	if (!device)
+		return -EINVAL;
+	acpi_walk_resources(device->handle, METHOD_NAME__CRS, 
+		acpi_reserve_io_ranges, NULL);
+
+	return 0;
+}
+
+static struct acpi_driver acpi_motherboard_driver1 = {
+	.name =		"motherboard",
+	.class =	"",
+	.ids =		ACPI_MB_HID1,
+	.ops =	{
+		.add =		acpi_motherboard_add,
+	},
+};
+
+static struct acpi_driver acpi_motherboard_driver2 = {
+	.name =		"motherboard",
+	.class =	"",
+	.ids =		ACPI_MB_HID2,
+	.ops =	{
+		.add =		acpi_motherboard_add,
+	},
+};
+
+static void __init
+acpi_reserve_resources (void)
+{
+	if (acpi_gbl_FADT->xpm1a_evt_blk.address && acpi_gbl_FADT->pm1_evt_len)
+		request_region(acpi_gbl_FADT->xpm1a_evt_blk.address, 
+			acpi_gbl_FADT->pm1_evt_len, "PM1a_EVT_BLK");
+
+	if (acpi_gbl_FADT->xpm1b_evt_blk.address && acpi_gbl_FADT->pm1_evt_len)
+		request_region(acpi_gbl_FADT->xpm1b_evt_blk.address,
+			acpi_gbl_FADT->pm1_evt_len, "PM1b_EVT_BLK");
+
+	if (acpi_gbl_FADT->xpm1a_cnt_blk.address && acpi_gbl_FADT->pm1_cnt_len)
+		request_region(acpi_gbl_FADT->xpm1a_cnt_blk.address, 
+			acpi_gbl_FADT->pm1_cnt_len, "PM1a_CNT_BLK");
+
+	if (acpi_gbl_FADT->xpm1b_cnt_blk.address && acpi_gbl_FADT->pm1_cnt_len)
+		request_region(acpi_gbl_FADT->xpm1b_cnt_blk.address, 
+			acpi_gbl_FADT->pm1_cnt_len, "PM1b_CNT_BLK");
+
+	if (acpi_gbl_FADT->xpm_tmr_blk.address && acpi_gbl_FADT->pm_tm_len == 4)
+		request_region(acpi_gbl_FADT->xpm_tmr_blk.address,
+			4, "PM_TMR");
+
+	if (acpi_gbl_FADT->xpm2_cnt_blk.address && acpi_gbl_FADT->pm2_cnt_len)
+		request_region(acpi_gbl_FADT->xpm2_cnt_blk.address,
+			acpi_gbl_FADT->pm2_cnt_len, "PM2_CNT_BLK");
+
+	/* Length of GPE blocks must be a non-negative multiple of 2 */
+
+	if (acpi_gbl_FADT->xgpe0_blk.address && acpi_gbl_FADT->gpe0_blk_len &&
+			!(acpi_gbl_FADT->gpe0_blk_len & 0x1))
+		request_region(acpi_gbl_FADT->xgpe0_blk.address,
+			acpi_gbl_FADT->gpe0_blk_len, "GPE0_BLK");
+
+	if (acpi_gbl_FADT->xgpe1_blk.address && acpi_gbl_FADT->gpe1_blk_len &&
+			!(acpi_gbl_FADT->gpe1_blk_len & 0x1))
+		request_region(acpi_gbl_FADT->xgpe1_blk.address,
+			acpi_gbl_FADT->gpe1_blk_len, "GPE1_BLK");
+}
+
+static int __init acpi_motherboard_init(void)
+{
+	acpi_bus_register_driver(&acpi_motherboard_driver1);
+	acpi_bus_register_driver(&acpi_motherboard_driver2);
+	/* 
+	 * Guarantee motherboard IO reservation first
+	 * This module must run after scan.c
+	 */
+	if (!acpi_disabled)
+		acpi_reserve_resources ();
+	return 0;
+}
+
+/**
+ * Reserve motherboard resources after PCI claim BARs,
+ * but before PCI assign resources for uninitialized PCI devices
+ */
+fs_initcall(acpi_motherboard_init);