diff options
Diffstat (limited to 'arch/arm26/kernel/dma.c')
| -rw-r--r-- | arch/arm26/kernel/dma.c | 273 |
1 files changed, 0 insertions, 273 deletions
diff --git a/arch/arm26/kernel/dma.c b/arch/arm26/kernel/dma.c deleted file mode 100644 index 80b5a774d905..000000000000 --- a/arch/arm26/kernel/dma.c +++ /dev/null @@ -1,273 +0,0 @@ -/* - * 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); |