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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [arch/] [sh/] [drivers/] [dma/] [dma-pvr2.c] - Rev 3
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/* * arch/sh/drivers/dma/dma-pvr2.c * * NEC PowerVR 2 (Dreamcast) DMA support * * 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/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/interrupt.h> #include <asm/mach/sysasic.h> #include <asm/mach/dma.h> #include <asm/dma.h> #include <asm/io.h> static unsigned int xfer_complete; static int count; static irqreturn_t pvr2_dma_interrupt(int irq, void *dev_id) { if (get_dma_residue(PVR2_CASCADE_CHAN)) { printk(KERN_WARNING "DMA: SH DMAC did not complete transfer " "on channel %d, waiting..\n", PVR2_CASCADE_CHAN); dma_wait_for_completion(PVR2_CASCADE_CHAN); } if (count++ < 10) pr_debug("Got a pvr2 dma interrupt for channel %d\n", irq - HW_EVENT_PVR2_DMA); xfer_complete = 1; return IRQ_HANDLED; } static int pvr2_request_dma(struct dma_channel *chan) { if (ctrl_inl(PVR2_DMA_MODE) != 0) return -EBUSY; ctrl_outl(0, PVR2_DMA_LMMODE0); return 0; } static int pvr2_get_dma_residue(struct dma_channel *chan) { return xfer_complete == 0; } static int pvr2_xfer_dma(struct dma_channel *chan) { if (chan->sar || !chan->dar) return -EINVAL; xfer_complete = 0; ctrl_outl(chan->dar, PVR2_DMA_ADDR); ctrl_outl(chan->count, PVR2_DMA_COUNT); ctrl_outl(chan->mode & DMA_MODE_MASK, PVR2_DMA_MODE); return 0; } static struct irqaction pvr2_dma_irq = { .name = "pvr2 DMA handler", .handler = pvr2_dma_interrupt, .flags = IRQF_DISABLED, }; static struct dma_ops pvr2_dma_ops = { .request = pvr2_request_dma, .get_residue = pvr2_get_dma_residue, .xfer = pvr2_xfer_dma, }; static struct dma_info pvr2_dma_info = { .name = "pvr2_dmac", .nr_channels = 1, .ops = &pvr2_dma_ops, .flags = DMAC_CHANNELS_TEI_CAPABLE, }; static int __init pvr2_dma_init(void) { setup_irq(HW_EVENT_PVR2_DMA, &pvr2_dma_irq); request_dma(PVR2_CASCADE_CHAN, "pvr2 cascade"); return register_dmac(&pvr2_dma_info); } static void __exit pvr2_dma_exit(void) { free_dma(PVR2_CASCADE_CHAN); free_irq(HW_EVENT_PVR2_DMA, 0); unregister_dmac(&pvr2_dma_info); } subsys_initcall(pvr2_dma_init); module_exit(pvr2_dma_exit); MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>"); MODULE_DESCRIPTION("NEC PowerVR 2 DMA driver"); MODULE_LICENSE("GPL");