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!

1 files changed, 348 insertions, 0 deletions

diff --git a/drivers/mca/mca-legacy.c b/drivers/mca/mca-legacy.c
new file mode 100644
index 000000000000..af56313ba0af
--- /dev/null
+++ b/drivers/mca/mca-legacy.c
@@ -0,0 +1,348 @@
+/* -*- mode: c; c-basic-offset: 8 -*- */
+
+/*
+ * MCA bus support functions for legacy (2.4) API.
+ *
+ * Legacy API means the API that operates in terms of MCA slot number
+ *
+ * (C) 2002 James Bottomley <James.Bottomley@HansenPartnership.com>
+ *
+**-----------------------------------------------------------------------------
+**  
+**  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., 675 Mass Ave, Cambridge, MA 02139, USA.
+**
+**-----------------------------------------------------------------------------
+ */
+
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/mca-legacy.h>
+#include <asm/io.h>
+
+/* NOTE: This structure is stack allocated */
+struct mca_find_adapter_info {
+	int			id;
+	int			slot;
+	struct mca_device	*mca_dev;
+};
+
+/* The purpose of this iterator is to loop over all the devices and
+ * find the one with the smallest slot number that's just greater than
+ * or equal to the required slot with a matching id */
+static int mca_find_adapter_callback(struct device *dev, void *data)
+{
+	struct mca_find_adapter_info *info = data;
+	struct mca_device *mca_dev = to_mca_device(dev);
+
+	if(mca_dev->pos_id != info->id)
+		return 0;
+
+	if(mca_dev->slot < info->slot)
+		return 0;
+
+	if(!info->mca_dev || info->mca_dev->slot >= mca_dev->slot)
+		info->mca_dev = mca_dev;
+
+	return 0;
+}
+
+/**
+ *	mca_find_adapter - scan for adapters
+ *	@id:	MCA identification to search for
+ *	@start:	starting slot
+ *
+ *	Search the MCA configuration for adapters matching the 16bit
+ *	ID given. The first time it should be called with start as zero
+ *	and then further calls made passing the return value of the
+ *	previous call until %MCA_NOTFOUND is returned.
+ *
+ *	Disabled adapters are not reported.
+ */
+
+int mca_find_adapter(int id, int start)
+{
+	struct mca_find_adapter_info info;
+
+	if(id == 0xffff)
+		return MCA_NOTFOUND;
+
+	info.slot = start;
+	info.id = id;
+	info.mca_dev = NULL;
+
+	for(;;) {
+		bus_for_each_dev(&mca_bus_type, NULL, &info, mca_find_adapter_callback);
+
+		if(info.mca_dev == NULL)
+			return MCA_NOTFOUND;
+
+		if(info.mca_dev->status != MCA_ADAPTER_DISABLED)
+			break;
+
+		/* OK, found adapter but it was disabled.  Go around
+		 * again, excluding the slot we just found */
+
+		info.slot = info.mca_dev->slot + 1;
+		info.mca_dev = NULL;
+	}
+		
+	return info.mca_dev->slot;
+}
+EXPORT_SYMBOL(mca_find_adapter);
+
+/*--------------------------------------------------------------------*/
+
+/**
+ *	mca_find_unused_adapter - scan for unused adapters
+ *	@id:	MCA identification to search for
+ *	@start:	starting slot
+ *
+ *	Search the MCA configuration for adapters matching the 16bit
+ *	ID given. The first time it should be called with start as zero
+ *	and then further calls made passing the return value of the
+ *	previous call until %MCA_NOTFOUND is returned.
+ *
+ *	Adapters that have been claimed by drivers and those that
+ *	are disabled are not reported. This function thus allows a driver
+ *	to scan for further cards when some may already be driven.
+ */
+
+int mca_find_unused_adapter(int id, int start)
+{
+	struct mca_find_adapter_info info = { 0 };
+
+	if (!MCA_bus || id == 0xffff)
+		return MCA_NOTFOUND;
+
+	info.slot = start;
+	info.id = id;
+	info.mca_dev = NULL;
+
+	for(;;) {
+		bus_for_each_dev(&mca_bus_type, NULL, &info, mca_find_adapter_callback);
+
+		if(info.mca_dev == NULL)
+			return MCA_NOTFOUND;
+
+		if(info.mca_dev->status != MCA_ADAPTER_DISABLED
+		   && !info.mca_dev->driver_loaded)
+			break;
+
+		/* OK, found adapter but it was disabled or already in
+		 * use.  Go around again, excluding the slot we just
+		 * found */
+
+		info.slot = info.mca_dev->slot + 1;
+		info.mca_dev = NULL;
+	}
+		
+	return info.mca_dev->slot;
+}
+EXPORT_SYMBOL(mca_find_unused_adapter);
+
+/* NOTE: stack allocated structure */
+struct mca_find_device_by_slot_info {
+	int			slot;
+	struct mca_device 	*mca_dev;
+};
+
+static int mca_find_device_by_slot_callback(struct device *dev, void *data)
+{
+	struct mca_find_device_by_slot_info *info = data;
+	struct mca_device *mca_dev = to_mca_device(dev);
+
+	if(mca_dev->slot == info->slot)
+		info->mca_dev = mca_dev;
+
+	return 0;
+}
+
+struct mca_device *mca_find_device_by_slot(int slot)
+{
+	struct mca_find_device_by_slot_info info;
+
+	info.slot = slot;
+	info.mca_dev = NULL;
+
+	bus_for_each_dev(&mca_bus_type, NULL, &info, mca_find_device_by_slot_callback);
+
+	return info.mca_dev;
+}
+EXPORT_SYMBOL(mca_find_device_by_slot);
+
+/**
+ *	mca_read_stored_pos - read POS register from boot data
+ *	@slot: slot number to read from
+ *	@reg:  register to read from
+ *
+ *	Fetch a POS value that was stored at boot time by the kernel
+ *	when it scanned the MCA space. The register value is returned.
+ *	Missing or invalid registers report 0.
+ */
+unsigned char mca_read_stored_pos(int slot, int reg)
+{
+	struct mca_device *mca_dev = mca_find_device_by_slot(slot);
+
+	if(!mca_dev)
+		return 0;
+
+	return mca_device_read_stored_pos(mca_dev, reg);
+}
+EXPORT_SYMBOL(mca_read_stored_pos);
+
+
+/**
+ *	mca_read_pos - read POS register from card
+ *	@slot: slot number to read from
+ *	@reg:  register to read from
+ *
+ *	Fetch a POS value directly from the hardware to obtain the
+ *	current value. This is much slower than mca_read_stored_pos and
+ *	may not be invoked from interrupt context. It handles the
+ *	deep magic required for onboard devices transparently.
+ */
+
+unsigned char mca_read_pos(int slot, int reg)
+{
+	struct mca_device *mca_dev = mca_find_device_by_slot(slot);
+
+	if(!mca_dev)
+		return 0;
+
+	return mca_device_read_pos(mca_dev, reg);
+}
+EXPORT_SYMBOL(mca_read_pos);
+
+		
+/**
+ *	mca_write_pos - read POS register from card
+ *	@slot: slot number to read from
+ *	@reg:  register to read from
+ *	@byte: byte to write to the POS registers
+ *
+ *	Store a POS value directly from the hardware. You should not
+ *	normally need to use this function and should have a very good
+ *	knowledge of MCA bus before you do so. Doing this wrongly can
+ *	damage the hardware.
+ *
+ *	This function may not be used from interrupt context.
+ *
+ *	Note that this a technically a Bad Thing, as IBM tech stuff says
+ *	you should only set POS values through their utilities.
+ *	However, some devices such as the 3c523 recommend that you write
+ *	back some data to make sure the configuration is consistent.
+ *	I'd say that IBM is right, but I like my drivers to work.
+ *
+ *	This function can't do checks to see if multiple devices end up
+ *	with the same resources, so you might see magic smoke if someone
+ *	screws up.
+ */
+
+void mca_write_pos(int slot, int reg, unsigned char byte)
+{
+	struct mca_device *mca_dev = mca_find_device_by_slot(slot);
+
+	if(!mca_dev)
+		return;
+
+	mca_device_write_pos(mca_dev, reg, byte);
+}
+EXPORT_SYMBOL(mca_write_pos);
+
+/**
+ *	mca_set_adapter_name - Set the description of the card
+ *	@slot: slot to name
+ *	@name: text string for the namen
+ *
+ *	This function sets the name reported via /proc for this
+ *	adapter slot. This is for user information only. Setting a
+ *	name deletes any previous name.
+ */
+
+void mca_set_adapter_name(int slot, char* name)
+{
+	struct mca_device *mca_dev = mca_find_device_by_slot(slot);
+
+	if(!mca_dev)
+		return;
+
+	mca_device_set_name(mca_dev, name);
+}
+EXPORT_SYMBOL(mca_set_adapter_name);
+
+/**
+ *	mca_is_adapter_used - check if claimed by driver
+ *	@slot:	slot to check
+ *
+ *	Returns 1 if the slot has been claimed by a driver
+ */
+
+int mca_is_adapter_used(int slot)
+{
+	struct mca_device *mca_dev = mca_find_device_by_slot(slot);
+
+	if(!mca_dev)
+		return 0;
+
+	return mca_device_claimed(mca_dev);
+}
+EXPORT_SYMBOL(mca_is_adapter_used);
+
+/**
+ *	mca_mark_as_used - claim an MCA device
+ *	@slot:	slot to claim
+ *	FIXME:  should we make this threadsafe
+ *
+ *	Claim an MCA slot for a device driver. If the
+ *	slot is already taken the function returns 1,
+ *	if it is not taken it is claimed and 0 is
+ *	returned.
+ */
+
+int mca_mark_as_used(int slot)
+{
+	struct mca_device *mca_dev = mca_find_device_by_slot(slot);
+
+	if(!mca_dev)
+		/* FIXME: this is actually a severe error */
+		return 1;
+
+	if(mca_device_claimed(mca_dev))
+		return 1;
+
+	mca_device_set_claim(mca_dev, 1);
+
+	return 0;
+}
+EXPORT_SYMBOL(mca_mark_as_used);
+
+/**
+ *	mca_mark_as_unused - release an MCA device
+ *	@slot:	slot to claim
+ *
+ *	Release the slot for other drives to use.
+ */
+
+void mca_mark_as_unused(int slot)
+{
+	struct mca_device *mca_dev = mca_find_device_by_slot(slot);
+
+	if(!mca_dev)
+		return;
+
+	mca_device_set_claim(mca_dev, 0);
+}
+EXPORT_SYMBOL(mca_mark_as_unused);
+