From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@ppc970.osdl.org>
Date: Sat, 16 Apr 2005 15:20:36 -0700
Subject: Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
---
 drivers/pnp/system.c | 111 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 drivers/pnp/system.c

(limited to 'drivers/pnp/system.c')

diff --git a/drivers/pnp/system.c b/drivers/pnp/system.c
new file mode 100644
index 000000000000..d42015c382af
--- /dev/null
+++ b/drivers/pnp/system.c
@@ -0,0 +1,111 @@
+/*
+ * system.c - a driver for reserving pnp system resources
+ *
+ * Some code is based on pnpbios_core.c
+ * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
+ *
+ */
+
+#include <linux/pnp.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/ioport.h>
+
+static const struct pnp_device_id pnp_dev_table[] = {
+	/* General ID for reserving resources */
+	{	"PNP0c02",		0	},
+	/* memory controller */
+	{	"PNP0c01",		0	},
+	{	"",			0	}
+};
+
+static void reserve_ioport_range(char *pnpid, int start, int end)
+{
+	struct resource *res;
+	char *regionid;
+
+	regionid = kmalloc(16, GFP_KERNEL);
+	if ( regionid == NULL )
+		return;
+	snprintf(regionid, 16, "pnp %s", pnpid);
+	res = request_region(start,end-start+1,regionid);
+	if ( res == NULL )
+		kfree( regionid );
+	else
+		res->flags &= ~IORESOURCE_BUSY;
+	/*
+	 * Failures at this point are usually harmless. pci quirks for
+	 * example do reserve stuff they know about too, so we may well
+	 * have double reservations.
+	 */
+	printk(KERN_INFO
+		"pnp: %s: ioport range 0x%x-0x%x %s reserved\n",
+		pnpid, start, end,
+		NULL != res ? "has been" : "could not be"
+	);
+
+	return;
+}
+
+static void reserve_resources_of_dev( struct pnp_dev *dev )
+{
+	int i;
+
+	for (i=0;i<PNP_MAX_PORT;i++) {
+		if (!pnp_port_valid(dev, i))
+			/* end of resources */
+			continue;
+		if (pnp_port_start(dev, i) == 0)
+			/* disabled */
+			/* Do nothing */
+			continue;
+		if (pnp_port_start(dev, i) < 0x100)
+			/*
+			 * Below 0x100 is only standard PC hardware
+			 * (pics, kbd, timer, dma, ...)
+			 * We should not get resource conflicts there,
+			 * and the kernel reserves these anyway
+			 * (see arch/i386/kernel/setup.c).
+			 * So, do nothing
+			 */
+			continue;
+		if (pnp_port_end(dev, i) < pnp_port_start(dev, i))
+			/* invalid endpoint */
+			/* Do nothing */
+			continue;
+		reserve_ioport_range(
+			dev->dev.bus_id,
+			pnp_port_start(dev, i),
+			pnp_port_end(dev, i)
+		);
+	}
+
+	return;
+}
+
+static int system_pnp_probe(struct pnp_dev * dev, const struct pnp_device_id *dev_id)
+{
+	reserve_resources_of_dev(dev);
+	return 0;
+}
+
+static struct pnp_driver system_pnp_driver = {
+	.name		= "system",
+	.id_table	= pnp_dev_table,
+	.flags		= PNP_DRIVER_RES_DO_NOT_CHANGE,
+	.probe		= system_pnp_probe,
+	.remove		= NULL,
+};
+
+static int __init pnp_system_init(void)
+{
+	return pnp_register_driver(&system_pnp_driver);
+}
+
+/**
+ * Reserve motherboard resources after PCI claim BARs,
+ * but before PCI assign resources for uninitialized PCI devices
+ */
+fs_initcall(pnp_system_init);
-- 
cgit v1.2.3-59-g8ed1b