drivers/spi/spi-ep93xx.c

115 	struct ep93xx_spi *espi = spi_controller_get_devdata(host);
116 	unsigned long spi_clk_rate = clk_get_rate(espi->clk);
150 	struct ep93xx_spi *espi = spi_controller_get_devdata(host);
173 	writel(div_cpsr, espi->mmio + SSPCPSR);
174 	writel(cr0, espi->mmio + SSPCR0);
181 	struct ep93xx_spi *espi = spi_controller_get_devdata(host);
187 			val = ((u16 *)xfer->tx_buf)[espi->tx];
188 		espi->tx += 2;
191 			val = ((u8 *)xfer->tx_buf)[espi->tx];
192 		espi->tx += 1;
194 	writel(val, espi->mmio + SSPDR);
199 	struct ep93xx_spi *espi = spi_controller_get_devdata(host);
203 	val = readl(espi->mmio + SSPDR);
206 			((u16 *)xfer->rx_buf)[espi->rx] = val;
207 		espi->rx += 2;
210 			((u8 *)xfer->rx_buf)[espi->rx] = val;
211 		espi->rx += 1;
228 	struct ep93xx_spi *espi = spi_controller_get_devdata(host);
232 	while ((readl(espi->mmio + SSPSR) & SSPSR_RNE)) {
234 		espi->fifo_level--;
238 	while (espi->fifo_level < SPI_FIFO_SIZE && espi->tx < xfer->len) {
240 		espi->fifo_level++;
243 	if (espi->rx == xfer->len)
275 	struct ep93xx_spi *espi = spi_controller_get_devdata(host);
296 		chan = espi->dma_rx;
298 		sgt = &espi->rx_sgt;
300 		conf.src_addr = espi->sspdr_phys;
303 		chan = espi->dma_tx;
305 		sgt = &espi->tx_sgt;
307 		conf.dst_addr = espi->sspdr_phys;
317 	 * because we are using @espi->zeropage to provide a zero RX buffer
342 			sg_set_page(sg, virt_to_page(espi->zeropage),
379 	struct ep93xx_spi *espi = spi_controller_get_devdata(host);
384 		chan = espi->dma_rx;
385 		sgt = &espi->rx_sgt;
387 		chan = espi->dma_tx;
388 		sgt = &espi->tx_sgt;
406 	struct ep93xx_spi *espi = spi_controller_get_devdata(host);
430 	dma_async_issue_pending(espi->dma_rx);
431 	dma_async_issue_pending(espi->dma_tx);
440 	struct ep93xx_spi *espi = spi_controller_get_devdata(host);
447 	if (readl(espi->mmio + SSPIIR) & SSPIIR_RORIS) {
449 		writel(0, espi->mmio + SSPICR);
473 	val = readl(espi->mmio + SSPCR1);
475 	writel(val, espi->mmio + SSPCR1);
486 	struct ep93xx_spi *espi = spi_controller_get_devdata(host);
497 	espi->rx = 0;
498 	espi->tx = 0;
505 	if (espi->dma_rx && xfer->len > SPI_FIFO_SIZE)
511 	val = readl(espi->mmio + SSPCR1);
513 	writel(val, espi->mmio + SSPCR1);
522 	struct ep93xx_spi *espi = spi_controller_get_devdata(host);
529 	while (readl(espi->mmio + SSPSR) & SSPSR_RNE) {
535 		readl(espi->mmio + SSPDR);
542 	espi->fifo_level = 0;
549 	struct ep93xx_spi *espi = spi_controller_get_devdata(host);
553 	ret = clk_prepare_enable(espi->clk);
557 	val = readl(espi->mmio + SSPCR1);
559 	writel(val, espi->mmio + SSPCR1);
566 	struct ep93xx_spi *espi = spi_controller_get_devdata(host);
569 	val = readl(espi->mmio + SSPCR1);
571 	writel(val, espi->mmio + SSPCR1);
573 	clk_disable_unprepare(espi->clk);
587 static int ep93xx_spi_setup_dma(struct ep93xx_spi *espi)
592 	espi->zeropage = (void *)get_zeroed_page(GFP_KERNEL);
593 	if (!espi->zeropage)
599 	espi->dma_rx_data.port = EP93XX_DMA_SSP;
600 	espi->dma_rx_data.direction = DMA_DEV_TO_MEM;
601 	espi->dma_rx_data.name = "ep93xx-spi-rx";
603 	espi->dma_rx = dma_request_channel(mask, ep93xx_spi_dma_filter,
604 					   &espi->dma_rx_data);
605 	if (!espi->dma_rx) {
610 	espi->dma_tx_data.port = EP93XX_DMA_SSP;
611 	espi->dma_tx_data.direction = DMA_MEM_TO_DEV;
612 	espi->dma_tx_data.name = "ep93xx-spi-tx";
614 	espi->dma_tx = dma_request_channel(mask, ep93xx_spi_dma_filter,
615 					   &espi->dma_tx_data);
616 	if (!espi->dma_tx) {
624 	dma_release_channel(espi->dma_rx);
625 	espi->dma_rx = NULL;
627 	free_page((unsigned long)espi->zeropage);
632 static void ep93xx_spi_release_dma(struct ep93xx_spi *espi)
634 	if (espi->dma_rx) {
635 		dma_release_channel(espi->dma_rx);
636 		sg_free_table(&espi->rx_sgt);
638 	if (espi->dma_tx) {
639 		dma_release_channel(espi->dma_tx);
640 		sg_free_table(&espi->tx_sgt);
643 	if (espi->zeropage)
644 		free_page((unsigned long)espi->zeropage);
651 	struct ep93xx_spi *espi;
666 	host = spi_alloc_host(&pdev->dev, sizeof(*espi));
686 	espi = spi_controller_get_devdata(host);
688 	espi->clk = devm_clk_get(&pdev->dev, NULL);
689 	if (IS_ERR(espi->clk)) {
691 		error = PTR_ERR(espi->clk);
699 	host->max_speed_hz = clk_get_rate(espi->clk) / 2;
700 	host->min_speed_hz = clk_get_rate(espi->clk) / (254 * 256);
702 	espi->mmio = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
703 	if (IS_ERR(espi->mmio)) {
704 		error = PTR_ERR(espi->mmio);
707 	espi->sspdr_phys = res->start + SSPDR;
716 	if (info->use_dma && ep93xx_spi_setup_dma(espi))
720 	writel(0, espi->mmio + SSPCR1);
734 	ep93xx_spi_release_dma(espi);
744 	struct ep93xx_spi *espi = spi_controller_get_devdata(host);
746 	ep93xx_spi_release_dma(espi);