drivers/dma/dmabrg.c

1 // SPDX-License-Identifier: GPL-2.0
5  * (c) 2007 MSC Vertriebsges.m.b.H, Manuel Lauss <mlau@msc-ge.com>
17  * from USB-SRAM/Audio units to main memory (and also the LCDC; but that
20  * from the traditional SH DMAC (although it blocks usage of DMAC 0)
23  * -----------------------------------------------------
24  *     0      | USB-DMA   | ... | xfer done    | DMABRGI1
25  *     1      | USB-UAE   | ... | USB addr err.| DMABRGI0
38  * DMABRGI0 services  USB  DMA  Address  errors,  but it still must be
39  * enabled/acked in the DMABRGCR register.  USB-DMA complete indicator
42  * DMABRGCR:	Bits 31-24: audio-dma ENABLE flags,
43  *		Bits 23-16: audio-dma STATUS flags,
44  *		Bits  9-8:  USB error/xfer ENABLE,
45  *		Bits  1-0:  USB error/xfer STATUS.
93 	/* USB stuff, get it out of the way first */  in dmabrg_irq()
103 		dcr &= dcr - 1;  in dmabrg_irq()
129 		return -ENOENT;  in dmabrg_request_irq()
131 		return -EBUSY;  in dmabrg_request_irq()
159 		return -ENOMEM;  in dmabrg_init()
162 	/* request DMAC channel 0 before anyone else can get it */  in dmabrg_init()
163 	ret = request_dma(0, "DMAC 0 (DMABRG)");  in dmabrg_init()
165 		printk(KERN_INFO "DMABRG: DMAC ch0 not reserved!\n");  in dmabrg_init()
170 	__raw_writel(0x94000000, DMARSRA);	/* enable DMABRG in DMAC 0 */  in dmabrg_init()
172 	/* enable DMABRG mode, enable the DMAC */  in dmabrg_init()
177 			"DMABRG USB address error", NULL);  in dmabrg_init()