Lines Matching +full:i3c +full:- +full:hci
1 // SPDX-License-Identifier: BSD-3-Clause
7 * Note: The I3C HCI v2.0 spec is still in flux. The IBI support is based on
13 #include <linux/dma-mapping.h>
15 #include <linux/i3c/master.h>
18 #include "hci.h"
40 #define rhs_reg_read(r) readl(hci->RHS_regs + (RHS_##r))
41 #define rhs_reg_write(r, v) writel(v, hci->RHS_regs + (RHS_##r))
52 * Ring Header (Per-Ring Bundle)
55 #define rh_reg_read(r) readl(rh->regs + (RH_##r))
56 #define rh_reg_write(r, v) writel(v, rh->regs + (RH_##r))
150 static void hci_dma_cleanup(struct i3c_hci *hci) in hci_dma_cleanup() argument
152 struct hci_rings_data *rings = hci->io_data; in hci_dma_cleanup()
159 for (i = 0; i < rings->total; i++) { in hci_dma_cleanup()
160 rh = &rings->headers[i]; in hci_dma_cleanup()
167 if (rh->xfer) in hci_dma_cleanup()
168 dma_free_coherent(&hci->master.dev, in hci_dma_cleanup()
169 rh->xfer_struct_sz * rh->xfer_entries, in hci_dma_cleanup()
170 rh->xfer, rh->xfer_dma); in hci_dma_cleanup()
171 if (rh->resp) in hci_dma_cleanup()
172 dma_free_coherent(&hci->master.dev, in hci_dma_cleanup()
173 rh->resp_struct_sz * rh->xfer_entries, in hci_dma_cleanup()
174 rh->resp, rh->resp_dma); in hci_dma_cleanup()
175 kfree(rh->src_xfers); in hci_dma_cleanup()
176 if (rh->ibi_status) in hci_dma_cleanup()
177 dma_free_coherent(&hci->master.dev, in hci_dma_cleanup()
178 rh->ibi_status_sz * rh->ibi_status_entries, in hci_dma_cleanup()
179 rh->ibi_status, rh->ibi_status_dma); in hci_dma_cleanup()
180 if (rh->ibi_data_dma) in hci_dma_cleanup()
181 dma_unmap_single(&hci->master.dev, rh->ibi_data_dma, in hci_dma_cleanup()
182 rh->ibi_chunk_sz * rh->ibi_chunks_total, in hci_dma_cleanup()
184 kfree(rh->ibi_data); in hci_dma_cleanup()
190 hci->io_data = NULL; in hci_dma_cleanup()
193 static int hci_dma_init(struct i3c_hci *hci) in hci_dma_init() argument
204 dev_info(&hci->master.dev, "%d DMA rings available\n", nr_rings); in hci_dma_init()
206 dev_err(&hci->master.dev, "number of rings should be <= 8\n"); in hci_dma_init()
213 return -ENOMEM; in hci_dma_init()
214 hci->io_data = rings; in hci_dma_init()
215 rings->total = nr_rings; in hci_dma_init()
217 regval = FIELD_PREP(MAX_HEADER_COUNT, rings->total); in hci_dma_init()
220 for (i = 0; i < rings->total; i++) { in hci_dma_init()
223 dev_info(&hci->master.dev, "Ring %d at offset %#x\n", i, offset); in hci_dma_init()
224 ret = -EINVAL; in hci_dma_init()
227 rh = &rings->headers[i]; in hci_dma_init()
228 rh->regs = hci->base_regs + offset; in hci_dma_init()
229 spin_lock_init(&rh->lock); in hci_dma_init()
230 init_completion(&rh->op_done); in hci_dma_init()
232 rh->xfer_entries = XFER_RING_ENTRIES; in hci_dma_init()
235 rh->xfer_struct_sz = FIELD_GET(CR_XFER_STRUCT_SIZE, regval); in hci_dma_init()
236 rh->resp_struct_sz = FIELD_GET(CR_RESP_STRUCT_SIZE, regval); in hci_dma_init()
238 rh->xfer_struct_sz, rh->resp_struct_sz); in hci_dma_init()
239 xfers_sz = rh->xfer_struct_sz * rh->xfer_entries; in hci_dma_init()
240 resps_sz = rh->resp_struct_sz * rh->xfer_entries; in hci_dma_init()
242 rh->xfer = dma_alloc_coherent(&hci->master.dev, xfers_sz, in hci_dma_init()
243 &rh->xfer_dma, GFP_KERNEL); in hci_dma_init()
244 rh->resp = dma_alloc_coherent(&hci->master.dev, resps_sz, in hci_dma_init()
245 &rh->resp_dma, GFP_KERNEL); in hci_dma_init()
246 rh->src_xfers = in hci_dma_init()
247 kmalloc_array(rh->xfer_entries, sizeof(*rh->src_xfers), in hci_dma_init()
249 ret = -ENOMEM; in hci_dma_init()
250 if (!rh->xfer || !rh->resp || !rh->src_xfers) in hci_dma_init()
253 rh_reg_write(CMD_RING_BASE_LO, lower_32_bits(rh->xfer_dma)); in hci_dma_init()
254 rh_reg_write(CMD_RING_BASE_HI, upper_32_bits(rh->xfer_dma)); in hci_dma_init()
255 rh_reg_write(RESP_RING_BASE_LO, lower_32_bits(rh->resp_dma)); in hci_dma_init()
256 rh_reg_write(RESP_RING_BASE_HI, upper_32_bits(rh->resp_dma)); in hci_dma_init()
258 regval = FIELD_PREP(CR_RING_SIZE, rh->xfer_entries); in hci_dma_init()
276 rh->ibi_status_sz = FIELD_GET(IBI_STATUS_STRUCT_SIZE, regval); in hci_dma_init()
277 rh->ibi_status_entries = IBI_STATUS_RING_ENTRIES; in hci_dma_init()
278 rh->ibi_chunks_total = IBI_CHUNK_POOL_SIZE; in hci_dma_init()
280 rh->ibi_chunk_sz = dma_get_cache_alignment(); in hci_dma_init()
281 rh->ibi_chunk_sz *= IBI_CHUNK_CACHELINES; in hci_dma_init()
287 rh->ibi_chunk_sz = umax(4, rh->ibi_chunk_sz); in hci_dma_init()
288 rh->ibi_chunk_sz = roundup_pow_of_two(rh->ibi_chunk_sz); in hci_dma_init()
289 if (rh->ibi_chunk_sz > 256) { in hci_dma_init()
290 ret = -EINVAL; in hci_dma_init()
294 ibi_status_ring_sz = rh->ibi_status_sz * rh->ibi_status_entries; in hci_dma_init()
295 ibi_data_ring_sz = rh->ibi_chunk_sz * rh->ibi_chunks_total; in hci_dma_init()
297 rh->ibi_status = in hci_dma_init()
298 dma_alloc_coherent(&hci->master.dev, ibi_status_ring_sz, in hci_dma_init()
299 &rh->ibi_status_dma, GFP_KERNEL); in hci_dma_init()
300 rh->ibi_data = kmalloc(ibi_data_ring_sz, GFP_KERNEL); in hci_dma_init()
301 ret = -ENOMEM; in hci_dma_init()
302 if (!rh->ibi_status || !rh->ibi_data) in hci_dma_init()
304 rh->ibi_data_dma = in hci_dma_init()
305 dma_map_single(&hci->master.dev, rh->ibi_data, in hci_dma_init()
307 if (dma_mapping_error(&hci->master.dev, rh->ibi_data_dma)) { in hci_dma_init()
308 rh->ibi_data_dma = 0; in hci_dma_init()
309 ret = -ENOMEM; in hci_dma_init()
313 rh_reg_write(IBI_STATUS_RING_BASE_LO, lower_32_bits(rh->ibi_status_dma)); in hci_dma_init()
314 rh_reg_write(IBI_STATUS_RING_BASE_HI, upper_32_bits(rh->ibi_status_dma)); in hci_dma_init()
315 rh_reg_write(IBI_DATA_RING_BASE_LO, lower_32_bits(rh->ibi_data_dma)); in hci_dma_init()
316 rh_reg_write(IBI_DATA_RING_BASE_HI, upper_32_bits(rh->ibi_data_dma)); in hci_dma_init()
319 rh->ibi_status_entries) | in hci_dma_init()
321 ilog2(rh->ibi_chunk_sz) - 2) | in hci_dma_init()
323 rh->ibi_chunks_total); in hci_dma_init()
338 hci_dma_cleanup(hci); in hci_dma_init()
342 static void hci_dma_unmap_xfer(struct i3c_hci *hci, in hci_dma_unmap_xfer() argument
350 if (!xfer->data) in hci_dma_unmap_xfer()
352 dma_unmap_single(&hci->master.dev, in hci_dma_unmap_xfer()
353 xfer->data_dma, xfer->data_len, in hci_dma_unmap_xfer()
354 xfer->rnw ? DMA_FROM_DEVICE : DMA_TO_DEVICE); in hci_dma_unmap_xfer()
358 static int hci_dma_queue_xfer(struct i3c_hci *hci, in hci_dma_queue_xfer() argument
361 struct hci_rings_data *rings = hci->io_data; in hci_dma_queue_xfer()
369 rh = &rings->headers[ring]; in hci_dma_queue_xfer()
375 u32 *ring_data = rh->xfer + rh->xfer_struct_sz * enqueue_ptr; in hci_dma_queue_xfer()
378 *ring_data++ = xfer->cmd_desc[0]; in hci_dma_queue_xfer()
379 *ring_data++ = xfer->cmd_desc[1]; in hci_dma_queue_xfer()
380 if (hci->cmd == &mipi_i3c_hci_cmd_v2) { in hci_dma_queue_xfer()
381 *ring_data++ = xfer->cmd_desc[2]; in hci_dma_queue_xfer()
382 *ring_data++ = xfer->cmd_desc[3]; in hci_dma_queue_xfer()
386 if (!xfer->data) in hci_dma_queue_xfer()
387 xfer->data_len = 0; in hci_dma_queue_xfer()
389 FIELD_PREP(DATA_BUF_BLOCK_SIZE, xfer->data_len) | in hci_dma_queue_xfer()
390 ((i == n - 1) ? DATA_BUF_IOC : 0); in hci_dma_queue_xfer()
393 if (xfer->data) { in hci_dma_queue_xfer()
394 buf = xfer->bounce_buf ? xfer->bounce_buf : xfer->data; in hci_dma_queue_xfer()
395 xfer->data_dma = in hci_dma_queue_xfer()
396 dma_map_single(&hci->master.dev, in hci_dma_queue_xfer()
398 xfer->data_len, in hci_dma_queue_xfer()
399 xfer->rnw ? in hci_dma_queue_xfer()
402 if (dma_mapping_error(&hci->master.dev, in hci_dma_queue_xfer()
403 xfer->data_dma)) { in hci_dma_queue_xfer()
404 hci_dma_unmap_xfer(hci, xfer_list, i); in hci_dma_queue_xfer()
405 return -ENOMEM; in hci_dma_queue_xfer()
407 *ring_data++ = lower_32_bits(xfer->data_dma); in hci_dma_queue_xfer()
408 *ring_data++ = upper_32_bits(xfer->data_dma); in hci_dma_queue_xfer()
415 rh->src_xfers[enqueue_ptr] = xfer; in hci_dma_queue_xfer()
417 xfer->ring_number = ring; in hci_dma_queue_xfer()
418 xfer->ring_entry = enqueue_ptr; in hci_dma_queue_xfer()
420 enqueue_ptr = (enqueue_ptr + 1) % rh->xfer_entries; in hci_dma_queue_xfer()
429 hci_dma_unmap_xfer(hci, xfer_list, i + 1); in hci_dma_queue_xfer()
430 return -EBUSY; in hci_dma_queue_xfer()
435 spin_lock_irq(&rh->lock); in hci_dma_queue_xfer()
440 spin_unlock_irq(&rh->lock); in hci_dma_queue_xfer()
445 static bool hci_dma_dequeue_xfer(struct i3c_hci *hci, in hci_dma_dequeue_xfer() argument
448 struct hci_rings_data *rings = hci->io_data; in hci_dma_dequeue_xfer()
449 struct hci_rh_data *rh = &rings->headers[xfer_list[0].ring_number]; in hci_dma_dequeue_xfer()
455 if (wait_for_completion_timeout(&rh->op_done, HZ) == 0) { in hci_dma_dequeue_xfer()
460 dev_crit(&hci->master.dev, "unable to abort the ring\n"); in hci_dma_dequeue_xfer()
466 int idx = xfer->ring_entry; in hci_dma_dequeue_xfer()
471 * descriptor entries with a no-op. in hci_dma_dequeue_xfer()
474 u32 *ring_data = rh->xfer + rh->xfer_struct_sz * idx; in hci_dma_dequeue_xfer()
476 /* store no-op cmd descriptor */ in hci_dma_dequeue_xfer()
479 if (hci->cmd == &mipi_i3c_hci_cmd_v2) { in hci_dma_dequeue_xfer()
485 rh->src_xfers[idx] = NULL; in hci_dma_dequeue_xfer()
488 hci_dma_unmap_xfer(hci, xfer, 1); in hci_dma_dequeue_xfer()
500 static void hci_dma_xfer_done(struct i3c_hci *hci, struct hci_rh_data *rh) in hci_dma_xfer_done() argument
503 unsigned int tid, done_ptr = rh->done_ptr; in hci_dma_xfer_done()
511 ring_resp = rh->resp + rh->resp_struct_sz * done_ptr; in hci_dma_xfer_done()
516 xfer = rh->src_xfers[done_ptr]; in hci_dma_xfer_done()
520 hci_dma_unmap_xfer(hci, xfer, 1); in hci_dma_xfer_done()
521 xfer->ring_entry = -1; in hci_dma_xfer_done()
522 xfer->response = resp; in hci_dma_xfer_done()
523 if (tid != xfer->cmd_tid) { in hci_dma_xfer_done()
524 dev_err(&hci->master.dev, in hci_dma_xfer_done()
526 tid, xfer->cmd_tid); in hci_dma_xfer_done()
529 if (xfer->completion) in hci_dma_xfer_done()
530 complete(xfer->completion); in hci_dma_xfer_done()
533 done_ptr = (done_ptr + 1) % rh->xfer_entries; in hci_dma_xfer_done()
534 rh->done_ptr = done_ptr; in hci_dma_xfer_done()
538 spin_lock(&rh->lock); in hci_dma_xfer_done()
543 spin_unlock(&rh->lock); in hci_dma_xfer_done()
546 static int hci_dma_request_ibi(struct i3c_hci *hci, struct i3c_dev_desc *dev, in hci_dma_request_ibi() argument
555 return -ENOMEM; in hci_dma_request_ibi()
561 dev_ibi->pool = pool; in hci_dma_request_ibi()
562 dev_ibi->max_len = req->max_payload_len; in hci_dma_request_ibi()
563 dev_data->ibi_data = dev_ibi; in hci_dma_request_ibi()
567 static void hci_dma_free_ibi(struct i3c_hci *hci, struct i3c_dev_desc *dev) in hci_dma_free_ibi() argument
570 struct hci_dma_dev_ibi_data *dev_ibi = dev_data->ibi_data; in hci_dma_free_ibi()
572 dev_data->ibi_data = NULL; in hci_dma_free_ibi()
573 i3c_generic_ibi_free_pool(dev_ibi->pool); in hci_dma_free_ibi()
577 static void hci_dma_recycle_ibi_slot(struct i3c_hci *hci, in hci_dma_recycle_ibi_slot() argument
582 struct hci_dma_dev_ibi_data *dev_ibi = dev_data->ibi_data; in hci_dma_recycle_ibi_slot()
584 i3c_generic_ibi_recycle_slot(dev_ibi->pool, slot); in hci_dma_recycle_ibi_slot()
587 static void hci_dma_process_ibi(struct i3c_hci *hci, struct hci_rh_data *rh) in hci_dma_process_ibi() argument
607 ibi_addr = -1; in hci_dma_process_ibi()
610 last_ptr = -1; in hci_dma_process_ibi()
614 ptr = (ptr + 1) % rh->ibi_status_entries) { in hci_dma_process_ibi()
618 ring_ibi_status = rh->ibi_status + rh->ibi_status_sz * ptr; in hci_dma_process_ibi()
626 } else if (ibi_addr == -1) { in hci_dma_process_ibi()
636 ibi_size += chunks * rh->ibi_chunk_sz; in hci_dma_process_ibi()
646 if (last_ptr == -1) { in hci_dma_process_ibi()
652 deq_ptr %= rh->ibi_status_entries; in hci_dma_process_ibi()
655 dev_err(&hci->master.dev, "IBI error from %#x\n", ibi_addr); in hci_dma_process_ibi()
660 dev = i3c_hci_addr_to_dev(hci, ibi_addr); in hci_dma_process_ibi()
662 dev_err(&hci->master.dev, in hci_dma_process_ibi()
668 dev_ibi = dev_data->ibi_data; in hci_dma_process_ibi()
669 if (ibi_size > dev_ibi->max_len) { in hci_dma_process_ibi()
670 dev_err(&hci->master.dev, "IBI payload too big (%d > %d)\n", in hci_dma_process_ibi()
671 ibi_size, dev_ibi->max_len); in hci_dma_process_ibi()
676 * This ring model is not suitable for zero-copy processing of IBIs. in hci_dma_process_ibi()
677 * We have the data chunk ring wrap-around to deal with, meaning in hci_dma_process_ibi()
685 slot = i3c_generic_ibi_get_free_slot(dev_ibi->pool); in hci_dma_process_ibi()
687 dev_err(&hci->master.dev, "no free slot for IBI\n"); in hci_dma_process_ibi()
692 ibi_data_offset = rh->ibi_chunk_sz * rh->ibi_chunk_ptr; in hci_dma_process_ibi()
693 ring_ibi_data = rh->ibi_data + ibi_data_offset; in hci_dma_process_ibi()
694 ring_ibi_data_dma = rh->ibi_data_dma + ibi_data_offset; in hci_dma_process_ibi()
695 first_part = (rh->ibi_chunks_total - rh->ibi_chunk_ptr) in hci_dma_process_ibi()
696 * rh->ibi_chunk_sz; in hci_dma_process_ibi()
699 dma_sync_single_for_cpu(&hci->master.dev, ring_ibi_data_dma, in hci_dma_process_ibi()
701 memcpy(slot->data, ring_ibi_data, first_part); in hci_dma_process_ibi()
706 ring_ibi_data = rh->ibi_data; in hci_dma_process_ibi()
707 ring_ibi_data_dma = rh->ibi_data_dma; in hci_dma_process_ibi()
708 dma_sync_single_for_cpu(&hci->master.dev, ring_ibi_data_dma, in hci_dma_process_ibi()
709 ibi_size - first_part, DMA_FROM_DEVICE); in hci_dma_process_ibi()
710 memcpy(slot->data + first_part, ring_ibi_data, in hci_dma_process_ibi()
711 ibi_size - first_part); in hci_dma_process_ibi()
715 slot->dev = dev; in hci_dma_process_ibi()
716 slot->len = ibi_size; in hci_dma_process_ibi()
721 spin_lock(&rh->lock); in hci_dma_process_ibi()
726 spin_unlock(&rh->lock); in hci_dma_process_ibi()
729 rh->ibi_chunk_ptr += ibi_chunks; in hci_dma_process_ibi()
730 rh->ibi_chunk_ptr %= rh->ibi_chunks_total; in hci_dma_process_ibi()
736 static bool hci_dma_irq_handler(struct i3c_hci *hci) in hci_dma_irq_handler() argument
738 struct hci_rings_data *rings = hci->io_data; in hci_dma_irq_handler()
742 for (i = 0; i < rings->total; i++) { in hci_dma_irq_handler()
746 rh = &rings->headers[i]; in hci_dma_irq_handler()
754 hci_dma_process_ibi(hci, rh); in hci_dma_irq_handler()
756 hci_dma_xfer_done(hci, rh); in hci_dma_irq_handler()
758 complete(&rh->op_done); in hci_dma_irq_handler()
763 dev_notice_ratelimited(&hci->master.dev, in hci_dma_irq_handler()
765 mipi_i3c_hci_resume(hci); in hci_dma_irq_handler()
783 dev_warn_ratelimited(&hci->master.dev, in hci_dma_irq_handler()
786 dev_err_ratelimited(&hci->master.dev, in hci_dma_irq_handler()