drivers/spi/spi-slave-mt27xx.c

98 static void mtk_spi_slave_disable_dma(struct mtk_spi_slave *mdata)
102 	reg_val = readl(mdata->base + SPIS_DMA_CFG_REG);
105 	writel(reg_val, mdata->base + SPIS_DMA_CFG_REG);
108 static void mtk_spi_slave_disable_xfer(struct mtk_spi_slave *mdata)
112 	reg_val = readl(mdata->base + SPIS_CFG_REG);
115 	writel(reg_val, mdata->base + SPIS_CFG_REG);
118 static int mtk_spi_slave_wait_for_completion(struct mtk_spi_slave *mdata)
120 	if (wait_for_completion_interruptible(&mdata->xfer_done) ||
121 	    mdata->slave_aborted) {
122 		dev_err(mdata->dev, "interrupted\n");
132 	struct mtk_spi_slave *mdata = spi_controller_get_devdata(ctlr);
140 	reg_val = readl(mdata->base + SPIS_CFG_REG);
157 	writel(reg_val, mdata->base + SPIS_CFG_REG);
166 	struct mtk_spi_slave *mdata = spi_controller_get_devdata(ctlr);
169 	writel(SPIS_SOFT_RST, mdata->base + SPIS_SOFT_RST_REG);
171 	reg_val = readl(mdata->base + SPIS_CFG_REG);
176 	writel(reg_val, mdata->base + SPIS_CFG_REG);
180 		iowrite32_rep(mdata->base + SPIS_TX_DATA_REG,
187 		writel(reg_val, mdata->base + SPIS_TX_DATA_REG);
190 	ret = mtk_spi_slave_wait_for_completion(mdata);
192 		mtk_spi_slave_disable_xfer(mdata);
193 		writel(SPIS_SOFT_RST, mdata->base + SPIS_SOFT_RST_REG);
203 	struct mtk_spi_slave *mdata = spi_controller_get_devdata(ctlr);
204 	struct device *dev = mdata->dev;
207 	writel(SPIS_SOFT_RST, mdata->base + SPIS_SOFT_RST_REG);
232 	writel(xfer->tx_dma, mdata->base + SPIS_TX_SRC_REG);
233 	writel(xfer->rx_dma, mdata->base + SPIS_RX_DST_REG);
235 	writel(SPIS_DMA_ADDR_EN, mdata->base + SPIS_SOFT_RST_REG);
238 	reg_val = readl(mdata->base + SPIS_CFG_REG);
243 	writel(reg_val, mdata->base + SPIS_CFG_REG);
248 	writel(reg_val, mdata->base + SPIS_DMA_CFG_REG);
250 	reg_val = readl(mdata->base + SPIS_DMA_CFG_REG);
256 	writel(reg_val, mdata->base + SPIS_DMA_CFG_REG);
258 	ret = mtk_spi_slave_wait_for_completion(mdata);
275 	mtk_spi_slave_disable_dma(mdata);
276 	mtk_spi_slave_disable_xfer(mdata);
277 	writel(SPIS_SOFT_RST, mdata->base + SPIS_SOFT_RST_REG);
286 	struct mtk_spi_slave *mdata = spi_controller_get_devdata(ctlr);
288 	reinit_completion(&mdata->xfer_done);
289 	mdata->slave_aborted = false;
290 	mdata->cur_transfer = xfer;
292 	if (xfer->len > mdata->dev_comp->max_fifo_size)
300 	struct mtk_spi_slave *mdata = spi_controller_get_devdata(spi->controller);
305 	writel(reg_val, mdata->base + SPIS_IRQ_EN_REG);
309 	writel(reg_val, mdata->base + SPIS_IRQ_MASK_REG);
311 	mtk_spi_slave_disable_dma(mdata);
312 	mtk_spi_slave_disable_xfer(mdata);
319 	struct mtk_spi_slave *mdata = spi_controller_get_devdata(ctlr);
321 	mdata->slave_aborted = true;
322 	complete(&mdata->xfer_done);
330 	struct mtk_spi_slave *mdata = spi_controller_get_devdata(ctlr);
331 	struct spi_transfer *trans = mdata->cur_transfer;
334 	int_status = readl(mdata->base + SPIS_IRQ_ST_REG);
335 	writel(int_status, mdata->base + SPIS_IRQ_CLR_REG);
343 		writel(SPIS_SOFT_RST, mdata->base + SPIS_SOFT_RST_REG);
346 			dma_unmap_single(mdata->dev, trans->tx_dma,
349 			dma_unmap_single(mdata->dev, trans->rx_dma,
352 		mtk_spi_slave_disable_dma(mdata);
353 		mtk_spi_slave_disable_xfer(mdata);
361 			ioread32_rep(mdata->base + SPIS_RX_DATA_REG,
365 			reg_val = readl(mdata->base + SPIS_RX_DATA_REG);
370 		mtk_spi_slave_disable_xfer(mdata);
378 	mdata->cur_transfer = NULL;
379 	complete(&mdata->xfer_done);
387 	struct mtk_spi_slave *mdata;
391 	ctlr = spi_alloc_slave(&pdev->dev, sizeof(*mdata));
413 	mdata = spi_controller_get_devdata(ctlr);
414 	mdata->dev_comp = of_id->data;
416 	if (mdata->dev_comp->must_rx)
421 	init_completion(&mdata->xfer_done);
422 	mdata->dev = &pdev->dev;
423 	mdata->base = devm_platform_ioremap_resource(pdev, 0);
424 	if (IS_ERR(mdata->base)) {
425 		ret = PTR_ERR(mdata->base);
442 	mdata->spi_clk = devm_clk_get(&pdev->dev, "spi");
443 	if (IS_ERR(mdata->spi_clk)) {
444 		ret = PTR_ERR(mdata->spi_clk);
449 	ret = clk_prepare_enable(mdata->spi_clk);
461 		clk_disable_unprepare(mdata->spi_clk);
465 	clk_disable_unprepare(mdata->spi_clk);
486 	struct mtk_spi_slave *mdata = spi_controller_get_devdata(ctlr);
494 		clk_disable_unprepare(mdata->spi_clk);
502 	struct mtk_spi_slave *mdata = spi_controller_get_devdata(ctlr);
506 		ret = clk_prepare_enable(mdata->spi_clk);
515 		clk_disable_unprepare(mdata->spi_clk);
525 	struct mtk_spi_slave *mdata = spi_controller_get_devdata(ctlr);
527 	clk_disable_unprepare(mdata->spi_clk);
535 	struct mtk_spi_slave *mdata = spi_controller_get_devdata(ctlr);
538 	ret = clk_prepare_enable(mdata->spi_clk);