drivers/spi/spi-axi-spi-engine.c

90 	/** @tx_xfer: Next xfer with tx_buf not yet fully written to TX FIFO. */
96 	/** @rx_xfer: Next xfer with rx_buf not yet fully written to RX FIFO. */
140 	struct spi_transfer *xfer)
144 	if (xfer->bits_per_word <= 8)
145 		len = xfer->len;
146 	else if (xfer->bits_per_word <= 16)
147 		len = xfer->len / 2;
149 		len = xfer->len / 4;
155 		if (xfer->tx_buf)
157 		if (xfer->rx_buf)
209 	struct spi_transfer *xfer;
211 	list_for_each_entry(xfer, &msg->transfers, transfer_list) {
212 		clk_div = DIV_ROUND_UP(max_hz, xfer->speed_hz);
213 		xfer->effective_speed_hz = max_hz / min(clk_div, 256U);
222 	struct spi_transfer *xfer;
233 	xfer = list_first_entry(&msg->transfers, struct spi_transfer, transfer_list);
234 	spi_engine_gen_cs(p, dry, spi, !xfer->cs_off);
236 	list_for_each_entry(xfer, &msg->transfers, transfer_list) {
237 		new_clk_div = host->max_speed_hz / xfer->effective_speed_hz;
246 		if (bits_per_word != xfer->bits_per_word) {
247 			bits_per_word = xfer->bits_per_word;
253 		spi_engine_gen_xfer(p, dry, xfer);
254 		spi_engine_gen_sleep(p, dry, spi_delay_to_ns(&xfer->delay, xfer),
255 				     xfer->effective_speed_hz);
257 		if (xfer->cs_change) {
258 			if (list_is_last(&xfer->transfer_list, &msg->transfers)) {
261 				if (!xfer->cs_off)
265 					&xfer->cs_change_delay, xfer),
266 					xfer->effective_speed_hz);
268 				if (!list_next_entry(xfer, transfer_list)->cs_off)
271 		} else if (!list_is_last(&xfer->transfer_list, &msg->transfers) &&
272 			   xfer->cs_off != list_next_entry(xfer, transfer_list)->cs_off) {
273 			spi_engine_gen_cs(p, dry, spi, xfer->cs_off);
292 	struct spi_transfer *xfer = *_xfer;
294 	if (!xfer) {
295 		xfer = list_first_entry(&msg->transfers,
297 	} else if (list_is_last(&xfer->transfer_list, &msg->transfers)) {
298 		xfer = NULL;
300 		xfer = list_next_entry(xfer, transfer_list);
303 	*_xfer = xfer;
309 	struct spi_transfer *xfer = st->tx_xfer;
312 		spi_engine_xfer_next(msg, &xfer);
313 	} while (xfer && !xfer->tx_buf);
315 	st->tx_xfer = xfer;
316 	if (xfer) {
317 		st->tx_length = xfer->len;
318 		st->tx_buf = xfer->tx_buf;
327 	struct spi_transfer *xfer = st->rx_xfer;
330 		spi_engine_xfer_next(msg, &xfer);
331 	} while (xfer && !xfer->rx_buf);
333 	st->rx_xfer = xfer;
334 	if (xfer) {
335 		st->rx_length = xfer->len;
336 		st->rx_buf = xfer->rx_buf;