+++ /dev/null
-/*
- * linux/arch/arm26/kernel/dma.c
- *
- * Copyright (C) 1995-2000 Russell King
- * 2003 Ian Molton
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Front-end to the DMA handling. This handles the allocation/freeing
- * of DMA channels, and provides a unified interface to the machines
- * DMA facilities.
- */
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/sched.h>
-#include <linux/mman.h>
-#include <linux/init.h>
-#include <linux/spinlock.h>
-#include <linux/errno.h>
-
-#include <asm/dma.h>
-
-DEFINE_SPINLOCK(dma_spin_lock);
-
-static dma_t dma_chan[MAX_DMA_CHANNELS];
-
-/*
- * Get dma list for /proc/dma
- */
-int get_dma_list(char *buf)
-{
- dma_t *dma;
- char *p = buf;
- int i;
-
- for (i = 0, dma = dma_chan; i < MAX_DMA_CHANNELS; i++, dma++)
- if (dma->lock)
- p += sprintf(p, "%2d: %14s %s\n", i,
- dma->d_ops->type, dma->device_id);
-
- return p - buf;
-}
-
-/*
- * Request DMA channel
- *
- * On certain platforms, we have to allocate an interrupt as well...
- */
-int request_dma(dmach_t channel, const char *device_id)
-{
- dma_t *dma = dma_chan + channel;
- int ret;
-
- if (channel >= MAX_DMA_CHANNELS || !dma->d_ops)
- goto bad_dma;
-
- if (xchg(&dma->lock, 1) != 0)
- goto busy;
-
- dma->device_id = device_id;
- dma->active = 0;
- dma->invalid = 1;
-
- ret = 0;
- if (dma->d_ops->request)
- ret = dma->d_ops->request(channel, dma);
-
- if (ret)
- xchg(&dma->lock, 0);
-
- return ret;
-
-bad_dma:
- printk(KERN_ERR "dma: trying to allocate DMA%d\n", channel);
- return -EINVAL;
-
-busy:
- return -EBUSY;
-}
-
-/*
- * Free DMA channel
- *
- * On certain platforms, we have to free interrupt as well...
- */
-void free_dma(dmach_t channel)
-{
- dma_t *dma = dma_chan + channel;
-
- if (channel >= MAX_DMA_CHANNELS || !dma->d_ops)
- goto bad_dma;
-
- if (dma->active) {
- printk(KERN_ERR "dma%d: freeing active DMA\n", channel);
- dma->d_ops->disable(channel, dma);
- dma->active = 0;
- }
-
- if (xchg(&dma->lock, 0) != 0) {
- if (dma->d_ops->free)
- dma->d_ops->free(channel, dma);
- return;
- }
-
- printk(KERN_ERR "dma%d: trying to free free DMA\n", channel);
- return;
-
-bad_dma:
- printk(KERN_ERR "dma: trying to free DMA%d\n", channel);
-}
-
-/* Set DMA Scatter-Gather list
- */
-void set_dma_sg (dmach_t channel, struct scatterlist *sg, int nr_sg)
-{
- dma_t *dma = dma_chan + channel;
-
- if (dma->active)
- printk(KERN_ERR "dma%d: altering DMA SG while "
- "DMA active\n", channel);
-
- dma->sg = sg;
- dma->sgcount = nr_sg;
- dma->using_sg = 1;
- dma->invalid = 1;
-}
-
-/* Set DMA address
- *
- * Copy address to the structure, and set the invalid bit
- */
-void set_dma_addr (dmach_t channel, unsigned long physaddr)
-{
- dma_t *dma = dma_chan + channel;
-
- if (dma->active)
- printk(KERN_ERR "dma%d: altering DMA address while "
- "DMA active\n", channel);
-
- dma->sg = &dma->buf;
- dma->sgcount = 1;
- dma->buf.__address = (char *)physaddr;//FIXME - not pretty
- dma->using_sg = 0;
- dma->invalid = 1;
-}
-
-/* Set DMA byte count
- *
- * Copy address to the structure, and set the invalid bit
- */
-void set_dma_count (dmach_t channel, unsigned long count)
-{
- dma_t *dma = dma_chan + channel;
-
- if (dma->active)
- printk(KERN_ERR "dma%d: altering DMA count while "
- "DMA active\n", channel);
-
- dma->sg = &dma->buf;
- dma->sgcount = 1;
- dma->buf.length = count;
- dma->using_sg = 0;
- dma->invalid = 1;
-}
-
-/* Set DMA direction mode
- */
-void set_dma_mode (dmach_t channel, dmamode_t mode)
-{
- dma_t *dma = dma_chan + channel;
-
- if (dma->active)
- printk(KERN_ERR "dma%d: altering DMA mode while "
- "DMA active\n", channel);
-
- dma->dma_mode = mode;
- dma->invalid = 1;
-}
-
-/* Enable DMA channel
- */
-void enable_dma (dmach_t channel)
-{
- dma_t *dma = dma_chan + channel;
-
- if (!dma->lock)
- goto free_dma;
-
- if (dma->active == 0) {
- dma->active = 1;
- dma->d_ops->enable(channel, dma);
- }
- return;
-
-free_dma:
- printk(KERN_ERR "dma%d: trying to enable free DMA\n", channel);
- BUG();
-}
-
-/* Disable DMA channel
- */
-void disable_dma (dmach_t channel)
-{
- dma_t *dma = dma_chan + channel;
-
- if (!dma->lock)
- goto free_dma;
-
- if (dma->active == 1) {
- dma->active = 0;
- dma->d_ops->disable(channel, dma);
- }
- return;
-
-free_dma:
- printk(KERN_ERR "dma%d: trying to disable free DMA\n", channel);
- BUG();
-}
-
-/*
- * Is the specified DMA channel active?
- */
-int dma_channel_active(dmach_t channel)
-{
- return dma_chan[channel].active;
-}
-
-void set_dma_page(dmach_t channel, char pagenr)
-{
- printk(KERN_ERR "dma%d: trying to set_dma_page\n", channel);
-}
-
-void set_dma_speed(dmach_t channel, int cycle_ns)
-{
- dma_t *dma = dma_chan + channel;
- int ret = 0;
-
- if (dma->d_ops->setspeed)
- ret = dma->d_ops->setspeed(channel, dma, cycle_ns);
- dma->speed = ret;
-}
-
-int get_dma_residue(dmach_t channel)
-{
- dma_t *dma = dma_chan + channel;
- int ret = 0;
-
- if (dma->d_ops->residue)
- ret = dma->d_ops->residue(channel, dma);
-
- return ret;
-}
-
-void __init init_dma(void)
-{
- arch_dma_init(dma_chan);
-}
-
-EXPORT_SYMBOL(request_dma);
-EXPORT_SYMBOL(free_dma);
-EXPORT_SYMBOL(enable_dma);
-EXPORT_SYMBOL(disable_dma);
-EXPORT_SYMBOL(set_dma_addr);
-EXPORT_SYMBOL(set_dma_count);
-EXPORT_SYMBOL(set_dma_mode);
-EXPORT_SYMBOL(set_dma_page);
-EXPORT_SYMBOL(get_dma_residue);
-EXPORT_SYMBOL(set_dma_sg);
-EXPORT_SYMBOL(set_dma_speed);
-
-EXPORT_SYMBOL(dma_spin_lock);
git.openpandora.org / pandora-kernel.git / blobdiff