1 /* SPDX-License-Identifier: GPL-2.0+ */
11  * with the Frame DMA engine on multiple Microchip switchcores.
13  * Frame DMA DCB format:
15  * +---------------------------+
17  * +---------------------------+
18  * |   Reserved  |    Info     |
19  * +---------------------------+
21  * +---------------------------+
23  * +---------------------------+
25  * +---------------------------+
27  * +---------------------------+
29  * +---------------------------+
31  * |-------------|-------------|
37  * |---------------------------|
39  * +-------------|-------------+
41  * +-------------|-------------+
44  * addresses of the data pointers can, as of writing, be either a: DMA address,
73 	u64 info;  member
78 	/* User-provided callback to set the dataptr */
80 	/* User-provided callback to set the nextptr */
91 	/* DMA address */
92 	dma_addr_t dma;  member
97 	/* Indexes used to access the next-to-be-used DCB or DB */
117 	fdma->dcb_index++;  in fdma_dcb_advance()
118 	if (fdma->dcb_index >= fdma->n_dcbs)  in fdma_dcb_advance()
119 		fdma->dcb_index = 0;  in fdma_dcb_advance()
125 	fdma->db_index++;  in fdma_db_advance()
131 	fdma->db_index = 0;  in fdma_db_reset()
137 	return fdma->db_index != fdma->n_dbs;  in fdma_dcb_is_reusable()
143 	return db->status & FDMA_DCB_STATUS_DONE;  in fdma_db_is_done()
149 	return FDMA_DCB_STATUS_BLOCKL(db->status);  in fdma_db_len_get()
155 	dcb->info = FDMA_DCB_INFO_DATAL(len);  in fdma_dcb_len_set()
162 	return &fdma->dcbs[dcb_idx].db[db_idx];  in fdma_db_get()
168 	return fdma_db_get(fdma, fdma->dcb_index, fdma->db_index);  in fdma_db_next_get()
174 	return &fdma->dcbs[dcb_idx];  in fdma_dcb_get()
180 	return fdma_dcb_get(fdma, fdma->dcb_index);  in fdma_dcb_next_get()
192 	*nextptr = fdma->dma + (sizeof(struct fdma_dcb) * dcb_idx);  in fdma_nextptr_cb()
196 /* Get the DMA address of a dataptr, by index. This function is only applicable
203 	return fdma->dma + (sizeof(struct fdma_dcb) * fdma->n_dcbs) +  in fdma_dataptr_get_contiguous()
204 	       (dcb_idx * fdma->n_dbs + db_idx) * fdma->db_size +  in fdma_dataptr_get_contiguous()
215 	return (u8 *)fdma->dcbs + (sizeof(struct fdma_dcb) * fdma->n_dcbs) +  in fdma_dataptr_virt_get_contiguous()
216 	       (dcb_idx * fdma->n_dbs + db_idx) * fdma->db_size +  in fdma_dataptr_virt_get_contiguous()
223 	return dcb == fdma->last_dcb;  in fdma_is_last()
226 int fdma_dcbs_init(struct fdma *fdma, u64 info, u64 status);
228 int fdma_dcb_add(struct fdma *fdma, int dcb_idx, u64 info, u64 status);
229 int __fdma_dcb_add(struct fdma *fdma, int dcb_idx, u64 info, u64 status,