Lines Matching full:dma
3 * 8250_dma.c - DMA Engine API support for 8250.c
10 #include <linux/dma-mapping.h>
23 struct uart_8250_dma *dma = p->dma; in __dma_tx_complete() local
28 dma_sync_single_for_cpu(dma->txchan->device->dev, dma->tx_addr, in __dma_tx_complete()
33 dma->tx_running = 0; in __dma_tx_complete()
35 xmit->tail += dma->tx_size; in __dma_tx_complete()
37 p->port.icount.tx += dma->tx_size; in __dma_tx_complete()
54 struct uart_8250_dma *dma = p->dma; in __dma_rx_complete() local
59 dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state); in __dma_rx_complete()
60 cur_index = dma->rx_size - state.residue; in __dma_rx_complete()
62 if (cur_index == dma->rx_index) in __dma_rx_complete()
64 else if (cur_index > dma->rx_index) in __dma_rx_complete()
65 count = cur_index - dma->rx_index; in __dma_rx_complete()
67 count = dma->rx_size - dma->rx_index; in __dma_rx_complete()
69 tty_insert_flip_string(tty_port, dma->rx_buf + dma->rx_index, count); in __dma_rx_complete()
71 if (cur_index < dma->rx_index) { in __dma_rx_complete()
72 tty_insert_flip_string(tty_port, dma->rx_buf, cur_index); in __dma_rx_complete()
77 dma->rx_index = cur_index; in __dma_rx_complete()
85 struct uart_8250_dma *dma = p->dma; in __dma_rx_complete() local
90 dma->rx_running = 0; in __dma_rx_complete()
91 dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state); in __dma_rx_complete()
93 count = dma->rx_size - state.residue; in __dma_rx_complete()
95 tty_insert_flip_string(tty_port, dma->rx_buf, count); in __dma_rx_complete()
105 struct uart_8250_dma *dma = p->dma; in serial8250_tx_dma() local
111 if (dma->tx_running) { in serial8250_tx_dma()
113 dmaengine_pause(dma->txchan); in serial8250_tx_dma()
115 dmaengine_resume(dma->txchan); in serial8250_tx_dma()
128 dma->tx_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); in serial8250_tx_dma()
130 if (dma->tx_size < MAX_TX_BYTES) { in serial8250_tx_dma()
135 desc = dmaengine_prep_slave_single(dma->txchan, in serial8250_tx_dma()
136 dma->tx_addr + xmit->tail, in serial8250_tx_dma()
137 dma->tx_size, DMA_MEM_TO_DEV, in serial8250_tx_dma()
144 dma->tx_running = 1; in serial8250_tx_dma()
148 dma->tx_cookie = dmaengine_submit(desc); in serial8250_tx_dma()
150 dma_sync_single_for_device(dma->txchan->device->dev, dma->tx_addr, in serial8250_tx_dma()
153 dma_async_issue_pending(dma->txchan); in serial8250_tx_dma()
154 if (dma->tx_err) { in serial8250_tx_dma()
155 dma->tx_err = 0; in serial8250_tx_dma()
160 dma->tx_err = 1; in serial8250_tx_dma()
173 struct uart_8250_dma *dma = p->dma; in serial8250_rx_dma() local
179 dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state); in serial8250_rx_dma()
180 cur_index = dma->rx_size - state.residue; in serial8250_rx_dma()
181 } while (cur_index % dma->rxconf.src_maxburst); in serial8250_rx_dma()
200 struct uart_8250_dma *dma = p->dma; in serial8250_start_rx_dma() local
203 desc = dmaengine_prep_dma_cyclic(dma->rxchan, dma->rx_addr, in serial8250_start_rx_dma()
204 dma->rx_size, dma->rx_size, in serial8250_start_rx_dma()
210 dma->rx_running = 1; in serial8250_start_rx_dma()
214 dma->rx_cookie = dmaengine_submit(desc); in serial8250_start_rx_dma()
215 dma_async_issue_pending(dma->rxchan); in serial8250_start_rx_dma()
216 dma->rx_index = 0; in serial8250_start_rx_dma()
224 struct uart_8250_dma *dma = p->dma; in serial8250_rx_dma() local
227 if (dma->rx_running) in serial8250_rx_dma()
230 desc = dmaengine_prep_slave_single(dma->rxchan, dma->rx_addr, in serial8250_rx_dma()
231 dma->rx_size, DMA_DEV_TO_MEM, in serial8250_rx_dma()
236 dma->rx_running = 1; in serial8250_rx_dma()
240 dma->rx_cookie = dmaengine_submit(desc); in serial8250_rx_dma()
242 dma_async_issue_pending(dma->rxchan); in serial8250_rx_dma()
251 struct uart_8250_dma *dma = p->dma; in serial8250_rx_dma_flush() local
253 if (dma->rx_running) { in serial8250_rx_dma_flush()
254 dmaengine_pause(dma->rxchan); in serial8250_rx_dma_flush()
256 dmaengine_terminate_async(dma->rxchan); in serial8250_rx_dma_flush()
263 struct uart_8250_dma *dma = p->dma; in serial8250_request_dma() local
264 phys_addr_t rx_dma_addr = dma->rx_dma_addr ? in serial8250_request_dma()
265 dma->rx_dma_addr : p->port.mapbase; in serial8250_request_dma()
266 phys_addr_t tx_dma_addr = dma->tx_dma_addr ? in serial8250_request_dma()
267 dma->tx_dma_addr : p->port.mapbase; in serial8250_request_dma()
273 dma->rxconf.direction = DMA_DEV_TO_MEM; in serial8250_request_dma()
274 dma->rxconf.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; in serial8250_request_dma()
275 dma->rxconf.src_addr = rx_dma_addr + UART_RX; in serial8250_request_dma()
278 dma->rxconf.src_maxburst = p->port.fifosize / 4; in serial8250_request_dma()
280 dma->rxconf.src_maxburst = 16; in serial8250_request_dma()
283 dma->txconf.direction = DMA_MEM_TO_DEV; in serial8250_request_dma()
284 dma->txconf.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; in serial8250_request_dma()
285 dma->txconf.dst_addr = tx_dma_addr + UART_TX; in serial8250_request_dma()
287 dma->txconf.dst_maxburst = 16; in serial8250_request_dma()
293 dma->rxchan = dma_request_slave_channel_compat(mask, in serial8250_request_dma()
294 dma->fn, dma->rx_param, in serial8250_request_dma()
296 if (!dma->rxchan) in serial8250_request_dma()
299 /* 8250 rx dma requires dmaengine driver to support pause/terminate */ in serial8250_request_dma()
300 ret = dma_get_slave_caps(dma->rxchan, &caps); in serial8250_request_dma()
309 dmaengine_slave_config(dma->rxchan, &dma->rxconf); in serial8250_request_dma()
313 if (!dma->rx_size) in serial8250_request_dma()
314 dma->rx_size = PAGE_SIZE * 2; in serial8250_request_dma()
316 if (!dma->rx_size) in serial8250_request_dma()
317 dma->rx_size = PAGE_SIZE; in serial8250_request_dma()
320 dma->rx_buf = dma_alloc_coherent(dma->rxchan->device->dev, dma->rx_size, in serial8250_request_dma()
321 &dma->rx_addr, GFP_KERNEL); in serial8250_request_dma()
322 if (!dma->rx_buf) { in serial8250_request_dma()
328 dma->txchan = dma_request_slave_channel_compat(mask, in serial8250_request_dma()
329 dma->fn, dma->tx_param, in serial8250_request_dma()
331 if (dma->txchan) { in serial8250_request_dma()
332 dmaengine_slave_config(dma->txchan, &dma->txconf); in serial8250_request_dma()
335 dma->tx_addr = dma_map_single(dma->txchan->device->dev, in serial8250_request_dma()
339 if (dma_mapping_error(dma->txchan->device->dev, dma->tx_addr)) { in serial8250_request_dma()
340 dma_free_coherent(dma->rxchan->device->dev, in serial8250_request_dma()
341 dma->rx_size, dma->rx_buf, in serial8250_request_dma()
342 dma->rx_addr); in serial8250_request_dma()
343 dma_release_channel(dma->txchan); in serial8250_request_dma()
344 dma->txchan = NULL; in serial8250_request_dma()
347 dev_info_ratelimited(p->port.dev, "got rx and tx dma channels\n"); in serial8250_request_dma()
349 dev_info_ratelimited(p->port.dev, "got rx dma channels only\n"); in serial8250_request_dma()
353 /* start dma for rx*/ in serial8250_request_dma()
358 dma_release_channel(dma->rxchan); in serial8250_request_dma()
365 struct uart_8250_dma *dma = p->dma; in serial8250_release_dma() local
367 if (!dma) in serial8250_release_dma()
371 dmaengine_terminate_sync(dma->rxchan); in serial8250_release_dma()
372 dma_free_coherent(dma->rxchan->device->dev, dma->rx_size, dma->rx_buf, in serial8250_release_dma()
373 dma->rx_addr); in serial8250_release_dma()
374 dma_release_channel(dma->rxchan); in serial8250_release_dma()
375 dma->rxchan = NULL; in serial8250_release_dma()
377 dma->rx_running = 0; in serial8250_release_dma()
380 if (dma->txchan) { in serial8250_release_dma()
381 dmaengine_terminate_all(dma->txchan); in serial8250_release_dma()
382 dma_unmap_single(dma->txchan->device->dev, dma->tx_addr, in serial8250_release_dma()
384 dma_release_channel(dma->txchan); in serial8250_release_dma()
385 dma->txchan = NULL; in serial8250_release_dma()
386 dma->tx_running = 0; in serial8250_release_dma()
388 dev_dbg_ratelimited(p->port.dev, "dma channels released\n"); in serial8250_release_dma()