SDIO

offset	name	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0	comment
0x30	SD_CTL							ERR_DET_ON	BUSY_DET_ON	CHK_CMD	JOB_START	ADMA_EN	JOB_DIR	DTRX_EN	CMD_EN	RSP_EN	RSPR2_EN

SD_CTL bits

ERR_DET_ON	BUSY_DET_ON	CHK_CMD	JOB_START	ADMA_EN	JOB_DIR	DTRX_EN	CMD_EN	RSP_EN	RSPR2_EN	Result
x						x				Multiple error interrupts after starting transfer with no error flags
	x				x	x				Gets stuck

ADMA

ADMA is pretty simple:

Create a list of descriptors
set the ADMA enable bit
set the DMA addr to the location of the first descriptor
set the DMA len to 0x10
set the DMA job count to 1
trigger and wait

ADMA descriptor format

offset	name	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0	notes
0x0	ctrl/flags	job cnt	job cnt	job cnt	job cnt	job cnt	job cnt	job cnt	job cnt	job cnt	job cnt	job cnt	job cnt	job cnt	job cnt	job cnt	job cnt														miu sel	miu sel	end	end - list descriptor in list
0x4	dma addr
0x8	dma len
0xc	padding