x86/kernel/i8237.c

1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * 8237A DMA controller suspend functions.
12 #include <asm/dma.h>
17  * 8237A DMA controller (used for ISA and LPC).
18  * Allocation is handled in kernel/dma.c and normal usage is
19  * in asm/dma.h.
34 		/* DMA count is a bit weird so this is not 0 */  in i8237A_resume()
38 	/* Enable cascade DMA or channel 0-3 won't work */  in i8237A_resume()
51 	 * From SKL PCH onwards, the legacy DMA device is removed in which the  in i8237A_init_ops()
52 	 * I/O ports (81h-83h, 87h, 89h-8Bh, 8Fh) related to it are removed  in i8237A_init_ops()
56 	 * the presence of DMA device since it may be used by BIOS to decode  in i8237A_init_ops()
62 		return -ENODEV;  in i8237A_init_ops()
66 	 * support 8237 DMA or bus mastering from LPC. Platform firmware  in i8237A_init_ops()
71 		return -ENODEV;  in i8237A_init_ops()