219 lines
6.6 KiB
C
219 lines
6.6 KiB
C
/* -*- mode: c; c-basic-offset: 8 -*- */
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/*
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* MCA device support functions
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*
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* These functions support the ongoing device access API.
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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.h>
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#include <linux/string.h>
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/**
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* mca_device_read_stored_pos - read POS register from stored data
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* @mca_dev: device 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_device_read_stored_pos(struct mca_device *mca_dev, int reg)
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{
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if(reg < 0 || reg >= 8)
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return 0;
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return mca_dev->pos[reg];
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}
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EXPORT_SYMBOL(mca_device_read_stored_pos);
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/**
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* mca_device_read_pos - read POS register from card
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* @mca_dev: device 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
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* mca_device_read_stored_pos and may not be invoked from
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* interrupt context. It handles the deep magic required for
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* onboard devices transparently.
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*/
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unsigned char mca_device_read_pos(struct mca_device *mca_dev, int reg)
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{
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struct mca_bus *mca_bus = to_mca_bus(mca_dev->dev.parent);
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return mca_bus->f.mca_read_pos(mca_dev, reg);
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return mca_dev->pos[reg];
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}
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EXPORT_SYMBOL(mca_device_read_pos);
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/**
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* mca_device_write_pos - read POS register from card
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* @mca_dev: device to write pos register to
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* @reg: register to write to
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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 to 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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*/
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void mca_device_write_pos(struct mca_device *mca_dev, int reg,
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unsigned char byte)
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{
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struct mca_bus *mca_bus = to_mca_bus(mca_dev->dev.parent);
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mca_bus->f.mca_write_pos(mca_dev, reg, byte);
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}
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EXPORT_SYMBOL(mca_device_write_pos);
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/**
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* mca_device_transform_irq - transform the ADF obtained IRQ
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* @mca_device: device whose irq needs transforming
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* @irq: input irq from ADF
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*
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* MCA Adapter Definition Files (ADF) contain irq, ioport, memory
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* etc. definitions. In systems with more than one bus, these need
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* to be transformed through bus mapping functions to get the real
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* system global quantities.
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*
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* This function transforms the interrupt number and returns the
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* transformed system global interrupt
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*/
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int mca_device_transform_irq(struct mca_device *mca_dev, int irq)
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{
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struct mca_bus *mca_bus = to_mca_bus(mca_dev->dev.parent);
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return mca_bus->f.mca_transform_irq(mca_dev, irq);
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}
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EXPORT_SYMBOL(mca_device_transform_irq);
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/**
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* mca_device_transform_ioport - transform the ADF obtained I/O port
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* @mca_device: device whose port needs transforming
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* @ioport: input I/O port from ADF
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*
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* MCA Adapter Definition Files (ADF) contain irq, ioport, memory
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* etc. definitions. In systems with more than one bus, these need
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* to be transformed through bus mapping functions to get the real
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* system global quantities.
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*
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* This function transforms the I/O port number and returns the
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* transformed system global port number.
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*
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* This transformation can be assumed to be linear for port ranges.
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*/
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int mca_device_transform_ioport(struct mca_device *mca_dev, int port)
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{
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struct mca_bus *mca_bus = to_mca_bus(mca_dev->dev.parent);
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return mca_bus->f.mca_transform_ioport(mca_dev, port);
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}
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EXPORT_SYMBOL(mca_device_transform_ioport);
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/**
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* mca_device_transform_memory - transform the ADF obtained memory
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* @mca_device: device whose memory region needs transforming
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* @mem: memory region start from ADF
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*
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* MCA Adapter Definition Files (ADF) contain irq, ioport, memory
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* etc. definitions. In systems with more than one bus, these need
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* to be transformed through bus mapping functions to get the real
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* system global quantities.
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*
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* This function transforms the memory region start and returns the
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* transformed system global memory region (physical).
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*
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* This transformation can be assumed to be linear for region ranges.
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*/
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void *mca_device_transform_memory(struct mca_device *mca_dev, void *mem)
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{
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struct mca_bus *mca_bus = to_mca_bus(mca_dev->dev.parent);
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return mca_bus->f.mca_transform_memory(mca_dev, mem);
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}
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EXPORT_SYMBOL(mca_device_transform_memory);
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/**
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* mca_device_claimed - check if claimed by driver
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* @mca_dev: device to check
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*
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* Returns 1 if the slot has been claimed by a driver
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*/
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int mca_device_claimed(struct mca_device *mca_dev)
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{
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return mca_dev->driver_loaded;
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}
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EXPORT_SYMBOL(mca_device_claimed);
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/**
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* mca_device_set_claim - set the claim value of the driver
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* @mca_dev: device to set value for
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* @val: claim value to set (1 claimed, 0 unclaimed)
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*/
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void mca_device_set_claim(struct mca_device *mca_dev, int val)
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{
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mca_dev->driver_loaded = val;
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}
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EXPORT_SYMBOL(mca_device_set_claim);
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/**
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* mca_device_status - get the status of the device
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* @mca_device: device to get
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*
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* returns an enumeration of the device status:
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*
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* MCA_ADAPTER_NORMAL adapter is OK.
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* MCA_ADAPTER_NONE no adapter at device (should never happen).
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* MCA_ADAPTER_DISABLED adapter is disabled.
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* MCA_ADAPTER_ERROR adapter cannot be initialised.
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*/
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enum MCA_AdapterStatus mca_device_status(struct mca_device *mca_dev)
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{
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return mca_dev->status;
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}
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EXPORT_SYMBOL(mca_device_status);
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/**
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* mca_device_set_name - set the name of the device
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* @mca_device: device to set the name of
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* @name: name to set
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*/
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void mca_device_set_name(struct mca_device *mca_dev, const char *name)
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{
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if(!mca_dev)
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return;
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strlcpy(mca_dev->name, name, sizeof(mca_dev->name));
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}
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EXPORT_SYMBOL(mca_device_set_name);
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