diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/sh/drivers/dma/dma-isa.c |
Linux-2.6.12-rc2v2.6.12-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!
Diffstat (limited to 'arch/sh/drivers/dma/dma-isa.c')
-rw-r--r-- | arch/sh/drivers/dma/dma-isa.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/arch/sh/drivers/dma/dma-isa.c b/arch/sh/drivers/dma/dma-isa.c new file mode 100644 index 00000000000..1c9bc45b8bc --- /dev/null +++ b/arch/sh/drivers/dma/dma-isa.c @@ -0,0 +1,106 @@ +/* + * arch/sh/drivers/dma/dma-isa.c + * + * Generic ISA DMA wrapper for SH DMA API + * + * Copyright (C) 2003, 2004 Paul Mundt + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <asm/dma.h> + +/* + * This implements a small wrapper set to make code using the old ISA DMA API + * work with the SH DMA API. Since most of the work in the new API happens + * at ops->xfer() time, we simply use the various set_dma_xxx() routines to + * fill in per-channel info, and then hand hand this off to ops->xfer() at + * enable_dma() time. + * + * For channels that are doing on-demand data transfer via cascading, the + * channel itself will still need to be configured through the new API. As + * such, this code is meant for only the simplest of tasks (and shouldn't be + * used in any new drivers at all). + * + * It should also be noted that various functions here are labelled as + * being deprecated. This is due to the fact that the ops->xfer() method is + * the preferred way of doing things (as well as just grabbing the spinlock + * directly). As such, any users of this interface will be warned rather + * loudly. + */ + +unsigned long __deprecated claim_dma_lock(void) +{ + unsigned long flags; + + spin_lock_irqsave(&dma_spin_lock, flags); + + return flags; +} +EXPORT_SYMBOL(claim_dma_lock); + +void __deprecated release_dma_lock(unsigned long flags) +{ + spin_unlock_irqrestore(&dma_spin_lock, flags); +} +EXPORT_SYMBOL(release_dma_lock); + +void __deprecated disable_dma(unsigned int chan) +{ + /* Nothing */ +} +EXPORT_SYMBOL(disable_dma); + +void __deprecated enable_dma(unsigned int chan) +{ + struct dma_info *info = get_dma_info(chan); + struct dma_channel *channel = &info->channels[chan]; + + info->ops->xfer(channel); +} +EXPORT_SYMBOL(enable_dma); + +void clear_dma_ff(unsigned int chan) +{ + /* Nothing */ +} +EXPORT_SYMBOL(clear_dma_ff); + +void set_dma_mode(unsigned int chan, char mode) +{ + struct dma_info *info = get_dma_info(chan); + struct dma_channel *channel = &info->channels[chan]; + + channel->mode = mode; +} +EXPORT_SYMBOL(set_dma_mode); + +void set_dma_addr(unsigned int chan, unsigned int addr) +{ + struct dma_info *info = get_dma_info(chan); + struct dma_channel *channel = &info->channels[chan]; + + /* + * Single address mode is the only thing supported through + * this interface. + */ + if ((channel->mode & DMA_MODE_MASK) == DMA_MODE_READ) { + channel->sar = addr; + } else { + channel->dar = addr; + } +} +EXPORT_SYMBOL(set_dma_addr); + +void set_dma_count(unsigned int chan, unsigned int count) +{ + struct dma_info *info = get_dma_info(chan); + struct dma_channel *channel = &info->channels[chan]; + + channel->count = count; +} +EXPORT_SYMBOL(set_dma_count); + |