3  * OMAP2 McSPI controller driver
32 #include <linux/platform_data/spi-omap2-mcspi.h>
153 	struct omap2_mcspi *mcspi = spi_controller_get_devdata(ctlr);  in mcspi_write_reg()  local
155 	writel_relaxed(val, mcspi->base + idx);  in mcspi_write_reg()
160 	struct omap2_mcspi *mcspi = spi_controller_get_devdata(ctlr);  in mcspi_read_reg()  local
162 	return readl_relaxed(mcspi->base + idx);  in mcspi_read_reg()
244 	struct omap2_mcspi *mcspi = spi_controller_get_devdata(spi->controller);  in omap2_mcspi_set_cs()  local
255 		int err = pm_runtime_resume_and_get(mcspi->dev);  in omap2_mcspi_set_cs()
257 			dev_err(mcspi->dev, "failed to get sync: %d\n", err);  in omap2_mcspi_set_cs()
264 		if (mcspi->use_multi_mode) {  in omap2_mcspi_set_cs()
275 		pm_runtime_mark_last_busy(mcspi->dev);  in omap2_mcspi_set_cs()
276 		pm_runtime_put_autosuspend(mcspi->dev);  in omap2_mcspi_set_cs()
282 	struct omap2_mcspi	*mcspi = spi_controller_get_devdata(ctlr);  in omap2_mcspi_set_mode()  local
283 	struct omap2_mcspi_regs	*ctx = &mcspi->ctx;  in omap2_mcspi_set_mode()
297 		if (mcspi->use_multi_mode)  in omap2_mcspi_set_mode()
312 	struct omap2_mcspi *mcspi;  in omap2_mcspi_set_fifo()  local
317 	mcspi = spi_controller_get_devdata(ctlr);  in omap2_mcspi_set_fifo()
347 		mcspi->fifo_depth = max_fifo_depth;  in omap2_mcspi_set_fifo()
360 	mcspi->fifo_depth = 0;  in omap2_mcspi_set_fifo()
380 static int mcspi_wait_for_completion(struct  omap2_mcspi *mcspi,  in mcspi_wait_for_completion()  argument
383 	if (spi_controller_is_target(mcspi->ctlr)) {  in mcspi_wait_for_completion()
385 		    mcspi->target_aborted)  in mcspi_wait_for_completion()
397 	struct omap2_mcspi *mcspi = spi_controller_get_devdata(spi->controller);  in omap2_mcspi_rx_callback()  local
398 	struct omap2_mcspi_dma *mcspi_dma = &mcspi->dma_channels[spi_get_chipselect(spi, 0)];  in omap2_mcspi_rx_callback()
409 	struct omap2_mcspi *mcspi = spi_controller_get_devdata(spi->controller);  in omap2_mcspi_tx_callback()  local
410 	struct omap2_mcspi_dma *mcspi_dma = &mcspi->dma_channels[spi_get_chipselect(spi, 0)];  in omap2_mcspi_tx_callback()
422 	struct omap2_mcspi	*mcspi;  in omap2_mcspi_tx_dma()  local
426 	mcspi = spi_controller_get_devdata(spi->controller);  in omap2_mcspi_tx_dma()
427 	mcspi_dma = &mcspi->dma_channels[spi_get_chipselect(spi, 0)];  in omap2_mcspi_tx_dma()
451 	struct omap2_mcspi	*mcspi;  in omap2_mcspi_rx_dma()  local
464 	mcspi = spi_controller_get_devdata(spi->controller);  in omap2_mcspi_rx_dma()
465 	mcspi_dma = &mcspi->dma_channels[spi_get_chipselect(spi, 0)];  in omap2_mcspi_rx_dma()
473 	if (mcspi->fifo_depth == 0)  in omap2_mcspi_rx_dma()
490 	 *  Reduce DMA transfer length by one more if McSPI is  in omap2_mcspi_rx_dma()
493 	if ((l & OMAP2_MCSPI_CHCONF_TURBO) && mcspi->fifo_depth == 0)  in omap2_mcspi_rx_dma()
532 	ret = mcspi_wait_for_completion(mcspi, &mcspi_dma->dma_rx_completion);  in omap2_mcspi_rx_dma()
533 	if (ret || mcspi->target_aborted) {  in omap2_mcspi_rx_dma()
542 	if (mcspi->fifo_depth > 0)  in omap2_mcspi_rx_dma()
596 	struct omap2_mcspi	*mcspi;  in omap2_mcspi_txrx_dma()  local
609 	mcspi = spi_controller_get_devdata(spi->controller);  in omap2_mcspi_txrx_dma()
610 	mcspi_dma = &mcspi->dma_channels[spi_get_chipselect(spi, 0)];  in omap2_mcspi_txrx_dma()
636 	mcspi->target_aborted = false;  in omap2_mcspi_txrx_dma()
639 	reinit_completion(&mcspi->txdone);  in omap2_mcspi_txrx_dma()
655 		ret = mcspi_wait_for_completion(mcspi, &mcspi_dma->dma_tx_completion);  in omap2_mcspi_txrx_dma()
656 		if (ret || mcspi->target_aborted) {  in omap2_mcspi_txrx_dma()
662 		if (spi_controller_is_target(mcspi->ctlr)) {  in omap2_mcspi_txrx_dma()
663 			ret = mcspi_wait_for_completion(mcspi, &mcspi->txdone);  in omap2_mcspi_txrx_dma()
664 			if (ret || mcspi->target_aborted)  in omap2_mcspi_txrx_dma()
668 		if (mcspi->fifo_depth > 0) {  in omap2_mcspi_txrx_dma()
669 			irqstat_reg = mcspi->base + OMAP2_MCSPI_IRQSTATUS;  in omap2_mcspi_txrx_dma()
675 			mcspi_write_reg(mcspi->ctlr, OMAP2_MCSPI_IRQSTATUS,  in omap2_mcspi_txrx_dma()
682 			if (mcspi->fifo_depth > 0) {  in omap2_mcspi_txrx_dma()
915 	struct omap2_mcspi *mcspi;  in omap2_mcspi_setup_transfer()  local
920 	mcspi = spi_controller_get_devdata(spi->controller);  in omap2_mcspi_setup_transfer()
930 	ref_clk_hz = mcspi->ref_clk_hz;  in omap2_mcspi_setup_transfer()
949 	if (mcspi->pin_dir == MCSPI_PINDIR_D0_IN_D1_OUT) {  in omap2_mcspi_setup_transfer()
1008 static int omap2_mcspi_request_dma(struct omap2_mcspi *mcspi,  in omap2_mcspi_request_dma()  argument
1013 	mcspi_dma->dma_rx = dma_request_chan(mcspi->dev,  in omap2_mcspi_request_dma()
1021 	mcspi_dma->dma_tx = dma_request_chan(mcspi->dev,  in omap2_mcspi_request_dma()
1039 	struct omap2_mcspi *mcspi = spi_controller_get_devdata(ctlr);  in omap2_mcspi_release_dma()  local
1044 		mcspi_dma = &mcspi->dma_channels[i];  in omap2_mcspi_release_dma()
1074 	struct omap2_mcspi	*mcspi = spi_controller_get_devdata(spi->controller);  in omap2_mcspi_setup()  local
1075 	struct omap2_mcspi_regs	*ctx = &mcspi->ctx;  in omap2_mcspi_setup()
1082 		cs->base = mcspi->base + spi_get_chipselect(spi, 0) * 0x14;  in omap2_mcspi_setup()
1083 		cs->phys = mcspi->phys + spi_get_chipselect(spi, 0) * 0x14;  in omap2_mcspi_setup()
1093 	ret = pm_runtime_resume_and_get(mcspi->dev);  in omap2_mcspi_setup()
1105 	pm_runtime_mark_last_busy(mcspi->dev);  in omap2_mcspi_setup()
1106 	pm_runtime_put_autosuspend(mcspi->dev);  in omap2_mcspi_setup()
1113 	struct omap2_mcspi *mcspi = data;  in omap2_mcspi_irq_handler()  local
1116 	irqstat	= mcspi_read_reg(mcspi->ctlr, OMAP2_MCSPI_IRQSTATUS);  in omap2_mcspi_irq_handler()
1121 	mcspi_write_reg(mcspi->ctlr, OMAP2_MCSPI_IRQENABLE, 0);  in omap2_mcspi_irq_handler()
1123 		complete(&mcspi->txdone);  in omap2_mcspi_irq_handler()
1130 	struct omap2_mcspi *mcspi = spi_controller_get_devdata(ctlr);  in omap2_mcspi_target_abort()  local
1131 	struct omap2_mcspi_dma *mcspi_dma = mcspi->dma_channels;  in omap2_mcspi_target_abort()
1133 	mcspi->target_aborted = true;  in omap2_mcspi_target_abort()
1136 	complete(&mcspi->txdone);  in omap2_mcspi_target_abort()
1153 	struct omap2_mcspi		*mcspi;  in omap2_mcspi_transfer_one()  local
1161 	mcspi = spi_controller_get_devdata(ctlr);  in omap2_mcspi_transfer_one()
1162 	mcspi_dma = mcspi->dma_channels + spi_get_chipselect(spi, 0);  in omap2_mcspi_transfer_one()
1238 	if (mcspi->fifo_depth > 0)  in omap2_mcspi_transfer_one()
1253 	if (mcspi->fifo_depth > 0 && t)  in omap2_mcspi_transfer_one()
1262 	struct omap2_mcspi	*mcspi = spi_controller_get_devdata(ctlr);  in omap2_mcspi_prepare_message()  local
1263 	struct omap2_mcspi_regs	*ctx = &mcspi->ctx;  in omap2_mcspi_prepare_message()
1272 	mcspi->use_multi_mode = true;  in omap2_mcspi_prepare_message()
1274 	if (mcspi->last_msg_kept_cs)  in omap2_mcspi_prepare_message()
1275 		mcspi->use_multi_mode = false;  in omap2_mcspi_prepare_message()
1292 			mcspi->use_multi_mode = false;  in omap2_mcspi_prepare_message()
1298 				mcspi->use_multi_mode = false;  in omap2_mcspi_prepare_message()
1299 				mcspi->last_msg_kept_cs = true;  in omap2_mcspi_prepare_message()
1301 				mcspi->last_msg_kept_cs = false;  in omap2_mcspi_prepare_message()
1306 				mcspi->use_multi_mode = false;  in omap2_mcspi_prepare_message()
1320 		if (msg->spi->controller_state == cs && !mcspi->use_multi_mode) {  in omap2_mcspi_prepare_message()
1339 	struct omap2_mcspi *mcspi = spi_controller_get_devdata(spi->controller);  in omap2_mcspi_can_dma()  local
1341 		&mcspi->dma_channels[spi_get_chipselect(spi, 0)];  in omap2_mcspi_can_dma()
1357 	struct omap2_mcspi *mcspi = spi_controller_get_devdata(spi->controller);  in omap2_mcspi_max_xfer_size()  local
1359 		&mcspi->dma_channels[spi_get_chipselect(spi, 0)];  in omap2_mcspi_max_xfer_size()
1361 	if (mcspi->max_xfer_len && mcspi_dma->dma_rx)  in omap2_mcspi_max_xfer_size()
1362 		return mcspi->max_xfer_len;  in omap2_mcspi_max_xfer_size()
1367 static int omap2_mcspi_controller_setup(struct omap2_mcspi *mcspi)  in omap2_mcspi_controller_setup()  argument
1369 	struct spi_controller	*ctlr = mcspi->ctlr;  in omap2_mcspi_controller_setup()
1370 	struct omap2_mcspi_regs	*ctx = &mcspi->ctx;  in omap2_mcspi_controller_setup()
1373 	ret = pm_runtime_resume_and_get(mcspi->dev);  in omap2_mcspi_controller_setup()
1382 	pm_runtime_mark_last_busy(mcspi->dev);  in omap2_mcspi_controller_setup()
1383 	pm_runtime_put_autosuspend(mcspi->dev);  in omap2_mcspi_controller_setup()
1406 	struct omap2_mcspi *mcspi = spi_controller_get_devdata(ctlr);  in omap_mcspi_runtime_resume()  local
1407 	struct omap2_mcspi_regs *ctx = &mcspi->ctx;  in omap_mcspi_runtime_resume()
1415 	/* McSPI: context restore */  in omap_mcspi_runtime_resume()
1455 		.compatible = "ti,omap2-mcspi",
1459 		.compatible = "ti,omap4-mcspi",
1463 		.compatible = "ti,am654-mcspi",
1474 	struct omap2_mcspi	*mcspi;  in omap2_mcspi_probe()  local
1482 		ctlr = spi_alloc_target(&pdev->dev, sizeof(*mcspi));  in omap2_mcspi_probe()
1484 		ctlr = spi_alloc_host(&pdev->dev, sizeof(*mcspi));  in omap2_mcspi_probe()
1504 	mcspi = spi_controller_get_devdata(ctlr);  in omap2_mcspi_probe()
1505 	mcspi->ctlr = ctlr;  in omap2_mcspi_probe()
1515 			mcspi->pin_dir = MCSPI_PINDIR_D0_OUT_D1_IN;  in omap2_mcspi_probe()
1519 		mcspi->pin_dir = pdata->pin_dir;  in omap2_mcspi_probe()
1523 		mcspi->max_xfer_len = pdata->max_xfer_len;  in omap2_mcspi_probe()
1527 	mcspi->base = devm_platform_get_and_ioremap_resource(pdev, 0, &r);  in omap2_mcspi_probe()
1528 	if (IS_ERR(mcspi->base)) {  in omap2_mcspi_probe()
1529 		status = PTR_ERR(mcspi->base);  in omap2_mcspi_probe()
1532 	mcspi->phys = r->start + regs_offset;  in omap2_mcspi_probe()
1533 	mcspi->base += regs_offset;  in omap2_mcspi_probe()
1535 	mcspi->dev = &pdev->dev;  in omap2_mcspi_probe()
1537 	INIT_LIST_HEAD(&mcspi->ctx.cs);  in omap2_mcspi_probe()
1539 	mcspi->dma_channels = devm_kcalloc(&pdev->dev, ctlr->num_chipselect,  in omap2_mcspi_probe()
1542 	if (mcspi->dma_channels == NULL) {  in omap2_mcspi_probe()
1548 		sprintf(mcspi->dma_channels[i].dma_rx_ch_name, "rx%d", i);  in omap2_mcspi_probe()
1549 		sprintf(mcspi->dma_channels[i].dma_tx_ch_name, "tx%d", i);  in omap2_mcspi_probe()
1551 		status = omap2_mcspi_request_dma(mcspi,  in omap2_mcspi_probe()
1552 						 &mcspi->dma_channels[i]);  in omap2_mcspi_probe()
1560 	init_completion(&mcspi->txdone);  in omap2_mcspi_probe()
1563 				  mcspi);  in omap2_mcspi_probe()
1569 	mcspi->ref_clk = devm_clk_get_optional_enabled(&pdev->dev, NULL);  in omap2_mcspi_probe()
1570 	if (IS_ERR(mcspi->ref_clk)) {  in omap2_mcspi_probe()
1571 		status = PTR_ERR(mcspi->ref_clk);  in omap2_mcspi_probe()
1575 	if (mcspi->ref_clk)  in omap2_mcspi_probe()
1576 		mcspi->ref_clk_hz = clk_get_rate(mcspi->ref_clk);  in omap2_mcspi_probe()
1578 		mcspi->ref_clk_hz = OMAP2_MCSPI_MAX_FREQ;  in omap2_mcspi_probe()
1579 	ctlr->max_speed_hz = mcspi->ref_clk_hz;  in omap2_mcspi_probe()
1580 	ctlr->min_speed_hz = mcspi->ref_clk_hz >> 15;  in omap2_mcspi_probe()
1586 	status = omap2_mcspi_controller_setup(mcspi);  in omap2_mcspi_probe()
1609 	struct omap2_mcspi *mcspi = spi_controller_get_devdata(ctlr);  in omap2_mcspi_remove()  local
1613 	pm_runtime_dont_use_autosuspend(mcspi->dev);  in omap2_mcspi_remove()
1614 	pm_runtime_put_sync(mcspi->dev);  in omap2_mcspi_remove()
1624 	struct omap2_mcspi *mcspi = spi_controller_get_devdata(ctlr);  in omap2_mcspi_suspend()  local
1629 		dev_warn(mcspi->dev, "%s: failed to set pins: %i\n",  in omap2_mcspi_suspend()
1634 		dev_warn(mcspi->dev, "%s: controller suspend failed: %i\n",  in omap2_mcspi_suspend()
1643 	struct omap2_mcspi *mcspi = spi_controller_get_devdata(ctlr);  in omap2_mcspi_resume()  local
1648 		dev_warn(mcspi->dev, "%s: controller resume failed: %i\n",  in omap2_mcspi_resume()
1672 MODULE_DESCRIPTION("OMAP2 McSPI controller driver");