330 lines
8.4 KiB
C
330 lines
8.4 KiB
C
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/* -*- mode: c; c-basic-offset: 8 -*- */
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/*
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* MCA bus support functions for legacy (2.4) API.
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*
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* Legacy API means the API that operates in terms of MCA slot number
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*
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* (C) 2002 James Bottomley <James.Bottomley@HansenPartnership.com>
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*
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**-----------------------------------------------------------------------------
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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**
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**-----------------------------------------------------------------------------
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*/
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/mca-legacy.h>
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#include <asm/io.h>
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/* NOTE: This structure is stack allocated */
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struct mca_find_adapter_info {
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int id;
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int slot;
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struct mca_device *mca_dev;
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};
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/* The purpose of this iterator is to loop over all the devices and
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* find the one with the smallest slot number that's just greater than
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* or equal to the required slot with a matching id */
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static int mca_find_adapter_callback(struct device *dev, void *data)
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{
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struct mca_find_adapter_info *info = data;
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struct mca_device *mca_dev = to_mca_device(dev);
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if(mca_dev->pos_id != info->id)
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return 0;
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if(mca_dev->slot < info->slot)
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return 0;
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if(!info->mca_dev || info->mca_dev->slot >= mca_dev->slot)
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info->mca_dev = mca_dev;
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return 0;
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}
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/**
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* mca_find_adapter - scan for adapters
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* @id: MCA identification to search for
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* @start: starting slot
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*
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* Search the MCA configuration for adapters matching the 16bit
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* ID given. The first time it should be called with start as zero
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* and then further calls made passing the return value of the
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* previous call until %MCA_NOTFOUND is returned.
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*
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* Disabled adapters are not reported.
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*/
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int mca_find_adapter(int id, int start)
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{
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struct mca_find_adapter_info info;
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if(id == 0xffff)
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return MCA_NOTFOUND;
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info.slot = start;
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info.id = id;
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info.mca_dev = NULL;
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for(;;) {
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bus_for_each_dev(&mca_bus_type, NULL, &info, mca_find_adapter_callback);
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if(info.mca_dev == NULL)
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return MCA_NOTFOUND;
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if(info.mca_dev->status != MCA_ADAPTER_DISABLED)
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break;
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/* OK, found adapter but it was disabled. Go around
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* again, excluding the slot we just found */
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info.slot = info.mca_dev->slot + 1;
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info.mca_dev = NULL;
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}
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return info.mca_dev->slot;
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}
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EXPORT_SYMBOL(mca_find_adapter);
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/*--------------------------------------------------------------------*/
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/**
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* mca_find_unused_adapter - scan for unused adapters
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* @id: MCA identification to search for
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* @start: starting slot
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*
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* Search the MCA configuration for adapters matching the 16bit
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* ID given. The first time it should be called with start as zero
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* and then further calls made passing the return value of the
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* previous call until %MCA_NOTFOUND is returned.
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*
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* Adapters that have been claimed by drivers and those that
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* are disabled are not reported. This function thus allows a driver
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* to scan for further cards when some may already be driven.
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*/
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int mca_find_unused_adapter(int id, int start)
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{
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struct mca_find_adapter_info info = { 0 };
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if (!MCA_bus || id == 0xffff)
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return MCA_NOTFOUND;
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info.slot = start;
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info.id = id;
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info.mca_dev = NULL;
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for(;;) {
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bus_for_each_dev(&mca_bus_type, NULL, &info, mca_find_adapter_callback);
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if(info.mca_dev == NULL)
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return MCA_NOTFOUND;
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if(info.mca_dev->status != MCA_ADAPTER_DISABLED
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&& !info.mca_dev->driver_loaded)
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break;
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/* OK, found adapter but it was disabled or already in
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* use. Go around again, excluding the slot we just
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* found */
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info.slot = info.mca_dev->slot + 1;
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info.mca_dev = NULL;
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}
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return info.mca_dev->slot;
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}
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EXPORT_SYMBOL(mca_find_unused_adapter);
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/* NOTE: stack allocated structure */
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struct mca_find_device_by_slot_info {
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int slot;
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struct mca_device *mca_dev;
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};
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static int mca_find_device_by_slot_callback(struct device *dev, void *data)
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{
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struct mca_find_device_by_slot_info *info = data;
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struct mca_device *mca_dev = to_mca_device(dev);
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if(mca_dev->slot == info->slot)
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info->mca_dev = mca_dev;
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return 0;
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}
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struct mca_device *mca_find_device_by_slot(int slot)
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{
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struct mca_find_device_by_slot_info info;
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info.slot = slot;
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info.mca_dev = NULL;
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bus_for_each_dev(&mca_bus_type, NULL, &info, mca_find_device_by_slot_callback);
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return info.mca_dev;
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}
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/**
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* mca_read_stored_pos - read POS register from boot data
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* @slot: slot number to read from
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* @reg: register to read from
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*
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* Fetch a POS value that was stored at boot time by the kernel
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* when it scanned the MCA space. The register value is returned.
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* Missing or invalid registers report 0.
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*/
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unsigned char mca_read_stored_pos(int slot, int reg)
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{
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struct mca_device *mca_dev = mca_find_device_by_slot(slot);
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if(!mca_dev)
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return 0;
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return mca_device_read_stored_pos(mca_dev, reg);
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}
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EXPORT_SYMBOL(mca_read_stored_pos);
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/**
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* mca_read_pos - read POS register from card
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* @slot: slot number to read from
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* @reg: register to read from
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*
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* Fetch a POS value directly from the hardware to obtain the
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* current value. This is much slower than mca_read_stored_pos and
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* may not be invoked from interrupt context. It handles the
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* deep magic required for onboard devices transparently.
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*/
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unsigned char mca_read_pos(int slot, int reg)
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{
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struct mca_device *mca_dev = mca_find_device_by_slot(slot);
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if(!mca_dev)
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return 0;
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return mca_device_read_pos(mca_dev, reg);
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}
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EXPORT_SYMBOL(mca_read_pos);
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/**
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* mca_write_pos - read POS register from card
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* @slot: slot number to read from
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* @reg: register to read from
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* @byte: byte to write to the POS registers
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*
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* Store a POS value directly from the hardware. You should not
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* normally need to use this function and should have a very good
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* knowledge of MCA bus before you do so. Doing this wrongly can
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* damage the hardware.
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*
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* This function may not be used from interrupt context.
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*
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* Note that this a technically a Bad Thing, as IBM tech stuff says
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* you should only set POS values through their utilities.
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* However, some devices such as the 3c523 recommend that you write
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* back some data to make sure the configuration is consistent.
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* I'd say that IBM is right, but I like my drivers to work.
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*
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* This function can't do checks to see if multiple devices end up
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* with the same resources, so you might see magic smoke if someone
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* screws up.
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*/
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void mca_write_pos(int slot, int reg, unsigned char byte)
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{
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struct mca_device *mca_dev = mca_find_device_by_slot(slot);
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if(!mca_dev)
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return;
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mca_device_write_pos(mca_dev, reg, byte);
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}
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EXPORT_SYMBOL(mca_write_pos);
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/**
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* mca_set_adapter_name - Set the description of the card
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* @slot: slot to name
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* @name: text string for the namen
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*
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* This function sets the name reported via /proc for this
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* adapter slot. This is for user information only. Setting a
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* name deletes any previous name.
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*/
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void mca_set_adapter_name(int slot, char* name)
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{
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struct mca_device *mca_dev = mca_find_device_by_slot(slot);
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if(!mca_dev)
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return;
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mca_device_set_name(mca_dev, name);
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}
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EXPORT_SYMBOL(mca_set_adapter_name);
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/**
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* mca_mark_as_used - claim an MCA device
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* @slot: slot to claim
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* FIXME: should we make this threadsafe
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*
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* Claim an MCA slot for a device driver. If the
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* slot is already taken the function returns 1,
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* if it is not taken it is claimed and 0 is
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* returned.
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*/
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int mca_mark_as_used(int slot)
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{
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struct mca_device *mca_dev = mca_find_device_by_slot(slot);
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if(!mca_dev)
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/* FIXME: this is actually a severe error */
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return 1;
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if(mca_device_claimed(mca_dev))
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return 1;
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mca_device_set_claim(mca_dev, 1);
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return 0;
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}
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EXPORT_SYMBOL(mca_mark_as_used);
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/**
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* mca_mark_as_unused - release an MCA device
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* @slot: slot to claim
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*
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* Release the slot for other drives to use.
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*/
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void mca_mark_as_unused(int slot)
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{
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struct mca_device *mca_dev = mca_find_device_by_slot(slot);
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if(!mca_dev)
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return;
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mca_device_set_claim(mca_dev, 0);
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}
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EXPORT_SYMBOL(mca_mark_as_unused);
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