Merge remote-tracking branches 'spi/topic/atmel', 'spi/topic/cadence', 'spi/topic/dw' and 'spi/topic/fsl-cpm' into spi-next

drivers/spi/spi-atmel.c

@@ -26,6 +26,7 @@
 #include <linux/io.h>
 #include <linux/gpio.h>
 #include <linux/pinctrl/consumer.h>
+#include <linux/pm_runtime.h>
 
 /* SPI register offsets */
 #define SPI_CR					0x0000
@@ -191,6 +192,8 @@
 
 #define SPI_DMA_TIMEOUT		(msecs_to_jiffies(1000))
 
+#define AUTOSUSPEND_TIMEOUT	2000
+
 struct atmel_spi_dma {
 	struct dma_chan			*chan_rx;
 	struct dma_chan			*chan_tx;
@@ -414,23 +417,6 @@ static int atmel_spi_dma_slave_config(struct atmel_spi *as,
 	return err;
 }
 
-static bool filter(struct dma_chan *chan, void *pdata)
-{
-	struct atmel_spi_dma *sl_pdata = pdata;
-	struct at_dma_slave *sl;
-
-	if (!sl_pdata)
-		return false;
-
-	sl = &sl_pdata->dma_slave;
-	if (sl->dma_dev == chan->device->dev) {
-		chan->private = sl;
-		return true;
-	} else {
-		return false;
-	}
-}
-
 static int atmel_spi_configure_dma(struct atmel_spi *as)
 {
 	struct dma_slave_config	slave_config;
@@ -441,19 +427,24 @@ static int atmel_spi_configure_dma(struct atmel_spi *as)
 	dma_cap_zero(mask);
 	dma_cap_set(DMA_SLAVE, mask);
 
-	as->dma.chan_tx = dma_request_slave_channel_compat(mask, filter,
-							   &as->dma,
-							   dev, "tx");
-	if (!as->dma.chan_tx) {
+	as->dma.chan_tx = dma_request_slave_channel_reason(dev, "tx");
+	if (IS_ERR(as->dma.chan_tx)) {
+		err = PTR_ERR(as->dma.chan_tx);
+		if (err == -EPROBE_DEFER) {
+			dev_warn(dev, "no DMA channel available at the moment\n");
+			return err;
+		}
 		dev_err(dev,
 			"DMA TX channel not available, SPI unable to use DMA\n");
 		err = -EBUSY;
 		goto error;
 	}
 
-	as->dma.chan_rx = dma_request_slave_channel_compat(mask, filter,
-							   &as->dma,
-							   dev, "rx");
+	/*
+	 * No reason to check EPROBE_DEFER here since we have already requested
+	 * tx channel. If it fails here, it's for another reason.
+	 */
+	as->dma.chan_rx = dma_request_slave_channel(dev, "rx");
 
 	if (!as->dma.chan_rx) {
 		dev_err(dev,
@@ -474,7 +465,7 @@ static int atmel_spi_configure_dma(struct atmel_spi *as)
 error:
 	if (as->dma.chan_rx)
 		dma_release_channel(as->dma.chan_rx);
-	if (as->dma.chan_tx)
+	if (!IS_ERR(as->dma.chan_tx))
 		dma_release_channel(as->dma.chan_tx);
 	return err;
 }
@@ -482,11 +473,9 @@ error:
 static void atmel_spi_stop_dma(struct atmel_spi *as)
 {
 	if (as->dma.chan_rx)
-		as->dma.chan_rx->device->device_control(as->dma.chan_rx,
-							DMA_TERMINATE_ALL, 0);
+		dmaengine_terminate_all(as->dma.chan_rx);
 	if (as->dma.chan_tx)
-		as->dma.chan_tx->device->device_control(as->dma.chan_tx,
-							DMA_TERMINATE_ALL, 0);
+		dmaengine_terminate_all(as->dma.chan_tx);
 }
 
 static void atmel_spi_release_dma(struct atmel_spi *as)
@@ -1315,6 +1304,7 @@ static int atmel_spi_probe(struct platform_device *pdev)
 	master->setup = atmel_spi_setup;
 	master->transfer_one_message = atmel_spi_transfer_one_message;
 	master->cleanup = atmel_spi_cleanup;
+	master->auto_runtime_pm = true;
 	platform_set_drvdata(pdev, master);
 
 	as = spi_master_get_devdata(master);
@@ -1347,8 +1337,11 @@ static int atmel_spi_probe(struct platform_device *pdev)
 	as->use_dma = false;
 	as->use_pdc = false;
 	if (as->caps.has_dma_support) {
-		if (atmel_spi_configure_dma(as) == 0)
+		ret = atmel_spi_configure_dma(as);
+		if (ret == 0)
 			as->use_dma = true;
+		else if (ret == -EPROBE_DEFER)
+			return ret;
 	} else {
 		as->use_pdc = true;
 	}
@@ -1387,6 +1380,11 @@ static int atmel_spi_probe(struct platform_device *pdev)
 	dev_info(&pdev->dev, "Atmel SPI Controller at 0x%08lx (irq %d)\n",
 			(unsigned long)regs->start, irq);
 
+	pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_TIMEOUT);
+	pm_runtime_use_autosuspend(&pdev->dev);
+	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+
 	ret = devm_spi_register_master(&pdev->dev, master);
 	if (ret)
 		goto out_free_dma;
@@ -1394,6 +1392,9 @@ static int atmel_spi_probe(struct platform_device *pdev)
 	return 0;
 
 out_free_dma:
+	pm_runtime_disable(&pdev->dev);
+	pm_runtime_set_suspended(&pdev->dev);
+
 	if (as->use_dma)
 		atmel_spi_release_dma(as);
 
@@ -1415,6 +1416,8 @@ static int atmel_spi_remove(struct platform_device *pdev)
 	struct spi_master	*master = platform_get_drvdata(pdev);
 	struct atmel_spi	*as = spi_master_get_devdata(master);
 
+	pm_runtime_get_sync(&pdev->dev);
+
 	/* reset the hardware and block queue progress */
 	spin_lock_irq(&as->lock);
 	if (as->use_dma) {
@@ -1432,14 +1435,37 @@ static int atmel_spi_remove(struct platform_device *pdev)
 
 	clk_disable_unprepare(as->clk);
 
+	pm_runtime_put_noidle(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+
 	return 0;
 }
 
-#ifdef CONFIG_PM_SLEEP
+#ifdef CONFIG_PM
+static int atmel_spi_runtime_suspend(struct device *dev)
+{
+	struct spi_master *master = dev_get_drvdata(dev);
+	struct atmel_spi *as = spi_master_get_devdata(master);
+
+	clk_disable_unprepare(as->clk);
+	pinctrl_pm_select_sleep_state(dev);
+
+	return 0;
+}
+
+static int atmel_spi_runtime_resume(struct device *dev)
+{
+	struct spi_master *master = dev_get_drvdata(dev);
+	struct atmel_spi *as = spi_master_get_devdata(master);
+
+	pinctrl_pm_select_default_state(dev);
+
+	return clk_prepare_enable(as->clk);
+}
+
 static int atmel_spi_suspend(struct device *dev)
 {
-	struct spi_master	*master = dev_get_drvdata(dev);
-	struct atmel_spi	*as = spi_master_get_devdata(master);
+	struct spi_master *master = dev_get_drvdata(dev);
 	int ret;
 
 	/* Stop the queue running */
@@ -1449,22 +1475,22 @@ static int atmel_spi_suspend(struct device *dev)
 		return ret;
 	}
 
-	clk_disable_unprepare(as->clk);
-
-	pinctrl_pm_select_sleep_state(dev);
+	if (!pm_runtime_suspended(dev))
+		atmel_spi_runtime_suspend(dev);
 
 	return 0;
 }
 
 static int atmel_spi_resume(struct device *dev)
 {
-	struct spi_master	*master = dev_get_drvdata(dev);
-	struct atmel_spi	*as = spi_master_get_devdata(master);
+	struct spi_master *master = dev_get_drvdata(dev);
 	int ret;
 
-	pinctrl_pm_select_default_state(dev);
-
-	clk_prepare_enable(as->clk);
+	if (!pm_runtime_suspended(dev)) {
+		ret = atmel_spi_runtime_resume(dev);
+		if (ret)
+			return ret;
+	}
 
 	/* Start the queue running */
 	ret = spi_master_resume(master);
@@ -1474,8 +1500,11 @@ static int atmel_spi_resume(struct device *dev)
 	return ret;
 }
 
-static SIMPLE_DEV_PM_OPS(atmel_spi_pm_ops, atmel_spi_suspend, atmel_spi_resume);
-
+static const struct dev_pm_ops atmel_spi_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(atmel_spi_suspend, atmel_spi_resume)
+	SET_RUNTIME_PM_OPS(atmel_spi_runtime_suspend,
+			   atmel_spi_runtime_resume, NULL)
+};
 #define ATMEL_SPI_PM_OPS	(&atmel_spi_pm_ops)
 #else
 #define ATMEL_SPI_PM_OPS	NULL

drivers/spi/spi-cadence.c

@@ -521,6 +521,17 @@ static int cdns_spi_probe(struct platform_device *pdev)
 		goto clk_dis_apb;
 	}
 
+	ret = of_property_read_u32(pdev->dev.of_node, "num-cs", &num_cs);
+	if (ret < 0)
+		master->num_chipselect = CDNS_SPI_DEFAULT_NUM_CS;
+	else
+		master->num_chipselect = num_cs;
+
+	ret = of_property_read_u32(pdev->dev.of_node, "is-decoded-cs",
+				   &xspi->is_decoded_cs);
+	if (ret < 0)
+		xspi->is_decoded_cs = 0;
+
 	/* SPI controller initializations */
 	cdns_spi_init_hw(xspi);
 
@@ -539,19 +550,6 @@ static int cdns_spi_probe(struct platform_device *pdev)
 		goto remove_master;
 	}
 
-	ret = of_property_read_u32(pdev->dev.of_node, "num-cs", &num_cs);
-
-	if (ret < 0)
-		master->num_chipselect = CDNS_SPI_DEFAULT_NUM_CS;
-	else
-		master->num_chipselect = num_cs;
-
-	ret = of_property_read_u32(pdev->dev.of_node, "is-decoded-cs",
-				   &xspi->is_decoded_cs);
-
-	if (ret < 0)
-		xspi->is_decoded_cs = 0;
-
 	master->prepare_transfer_hardware = cdns_prepare_transfer_hardware;
 	master->prepare_message = cdns_prepare_message;
 	master->transfer_one = cdns_transfer_one;

drivers/spi/spi-dw-mid.c

@@ -26,6 +26,9 @@
 #include <linux/intel_mid_dma.h>
 #include <linux/pci.h>
 
+#define RX_BUSY		0
+#define TX_BUSY		1
+
 struct mid_dma {
 	struct intel_mid_dma_slave	dmas_tx;
 	struct intel_mid_dma_slave	dmas_rx;
@@ -98,41 +101,26 @@ static void mid_spi_dma_exit(struct dw_spi *dws)
 }
 
 /*
- * dws->dma_chan_done is cleared before the dma transfer starts,
- * callback for rx/tx channel will each increment it by 1.
- * Reaching 2 means the whole spi transaction is done.
+ * dws->dma_chan_busy is set before the dma transfer starts, callback for tx
+ * channel will clear a corresponding bit.
  */
-static void dw_spi_dma_done(void *arg)
+static void dw_spi_dma_tx_done(void *arg)
 {
 	struct dw_spi *dws = arg;
 
-	if (++dws->dma_chan_done != 2)
+	if (test_and_clear_bit(TX_BUSY, &dws->dma_chan_busy) & BIT(RX_BUSY))
 		return;
 	dw_spi_xfer_done(dws);
 }
 
-static int mid_spi_dma_transfer(struct dw_spi *dws, int cs_change)
+static struct dma_async_tx_descriptor *dw_spi_dma_prepare_tx(struct dw_spi *dws)
 {
-	struct dma_async_tx_descriptor *txdesc, *rxdesc;
-	struct dma_slave_config txconf, rxconf;
-	u16 dma_ctrl = 0;
-
-	/* 1. setup DMA related registers */
-	if (cs_change) {
-		spi_enable_chip(dws, 0);
-		dw_writew(dws, DW_SPI_DMARDLR, 0xf);
-		dw_writew(dws, DW_SPI_DMATDLR, 0x10);
-		if (dws->tx_dma)
-			dma_ctrl |= SPI_DMA_TDMAE;
-		if (dws->rx_dma)
-			dma_ctrl |= SPI_DMA_RDMAE;
-		dw_writew(dws, DW_SPI_DMACR, dma_ctrl);
-		spi_enable_chip(dws, 1);
-	}
+	struct dma_slave_config txconf;
+	struct dma_async_tx_descriptor *txdesc;
 
-	dws->dma_chan_done = 0;
+	if (!dws->tx_dma)
+		return NULL;
 
-	/* 2. Prepare the TX dma transfer */
 	txconf.direction = DMA_MEM_TO_DEV;
 	txconf.dst_addr = dws->dma_addr;
 	txconf.dst_maxburst = LNW_DMA_MSIZE_16;
@@ -151,10 +139,33 @@ static int mid_spi_dma_transfer(struct dw_spi *dws, int cs_change)
 				1,
 				DMA_MEM_TO_DEV,
 				DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
-	txdesc->callback = dw_spi_dma_done;
+	txdesc->callback = dw_spi_dma_tx_done;
 	txdesc->callback_param = dws;
 
-	/* 3. Prepare the RX dma transfer */
+	return txdesc;
+}
+
+/*
+ * dws->dma_chan_busy is set before the dma transfer starts, callback for rx
+ * channel will clear a corresponding bit.
+ */
+static void dw_spi_dma_rx_done(void *arg)
+{
+	struct dw_spi *dws = arg;
+
+	if (test_and_clear_bit(RX_BUSY, &dws->dma_chan_busy) & BIT(TX_BUSY))
+		return;
+	dw_spi_xfer_done(dws);
+}
+
+static struct dma_async_tx_descriptor *dw_spi_dma_prepare_rx(struct dw_spi *dws)
+{
+	struct dma_slave_config rxconf;
+	struct dma_async_tx_descriptor *rxdesc;
+
+	if (!dws->rx_dma)
+		return NULL;
+
 	rxconf.direction = DMA_DEV_TO_MEM;
 	rxconf.src_addr = dws->dma_addr;
 	rxconf.src_maxburst = LNW_DMA_MSIZE_16;
@@ -173,15 +184,56 @@ static int mid_spi_dma_transfer(struct dw_spi *dws, int cs_change)
 				1,
 				DMA_DEV_TO_MEM,
 				DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
-	rxdesc->callback = dw_spi_dma_done;
+	rxdesc->callback = dw_spi_dma_rx_done;
 	rxdesc->callback_param = dws;
 
+	return rxdesc;
+}
+
+static void dw_spi_dma_setup(struct dw_spi *dws)
+{
+	u16 dma_ctrl = 0;
+
+	spi_enable_chip(dws, 0);
+
+	dw_writew(dws, DW_SPI_DMARDLR, 0xf);
+	dw_writew(dws, DW_SPI_DMATDLR, 0x10);
+
+	if (dws->tx_dma)
+		dma_ctrl |= SPI_DMA_TDMAE;
+	if (dws->rx_dma)
+		dma_ctrl |= SPI_DMA_RDMAE;
+	dw_writew(dws, DW_SPI_DMACR, dma_ctrl);
+
+	spi_enable_chip(dws, 1);
+}
+
+static int mid_spi_dma_transfer(struct dw_spi *dws, int cs_change)
+{
+	struct dma_async_tx_descriptor *txdesc, *rxdesc;
+
+	/* 1. setup DMA related registers */
+	if (cs_change)
+		dw_spi_dma_setup(dws);
+
+	/* 2. Prepare the TX dma transfer */
+	txdesc = dw_spi_dma_prepare_tx(dws);
+
+	/* 3. Prepare the RX dma transfer */
+	rxdesc = dw_spi_dma_prepare_rx(dws);
+
 	/* rx must be started before tx due to spi instinct */
-	dmaengine_submit(rxdesc);
-	dma_async_issue_pending(dws->rxchan);
+	if (rxdesc) {
+		set_bit(RX_BUSY, &dws->dma_chan_busy);
+		dmaengine_submit(rxdesc);
+		dma_async_issue_pending(dws->rxchan);
+	}
 
-	dmaengine_submit(txdesc);
-	dma_async_issue_pending(dws->txchan);
+	if (txdesc) {
+		set_bit(TX_BUSY, &dws->dma_chan_busy);
+		dmaengine_submit(txdesc);
+		dma_async_issue_pending(dws->txchan);
+	}
 
 	return 0;
 }

drivers/spi/spi-dw.h

@@ -139,7 +139,7 @@ struct dw_spi {
 	struct scatterlist	tx_sgl;
 	struct dma_chan		*rxchan;
 	struct scatterlist	rx_sgl;
-	int			dma_chan_done;
+	unsigned long		dma_chan_busy;
 	struct device		*dma_dev;
 	dma_addr_t		dma_addr; /* phy address of the Data register */
 	struct dw_spi_dma_ops	*dma_ops;

drivers/spi/spi-fsl-cpm.c

@@ -56,12 +56,15 @@ void fsl_spi_cpm_reinit_txrx(struct mpc8xxx_spi *mspi)
 		qe_issue_cmd(QE_INIT_TX_RX, mspi->subblock,
 			     QE_CR_PROTOCOL_UNSPECIFIED, 0);
 	} else {
-		cpm_command(CPM_SPI_CMD, CPM_CR_INIT_TRX);
 		if (mspi->flags & SPI_CPM1) {
+			out_be32(&mspi->pram->rstate, 0);
 			out_be16(&mspi->pram->rbptr,
 				 in_be16(&mspi->pram->rbase));
+			out_be32(&mspi->pram->tstate, 0);
 			out_be16(&mspi->pram->tbptr,
 				 in_be16(&mspi->pram->tbase));
+		} else {
+			cpm_command(CPM_SPI_CMD, CPM_CR_INIT_TRX);
 		}
 	}
 }