spi/omap2-mcspi: convert to the pump message infrastructure

This patch converts the OMAP SPI driver to use the SPI infrastructure
pump message queue.Also fixes the below warning.
master is unqueued, this is deprecated
Signed-off-by: NShubhrajyoti D <shubhrajyoti@ti.com>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>

drivers/spi/spi-omap2-mcspi.c

@@ -120,10 +120,6 @@ struct omap2_mcspi_regs {
 };
 
 struct omap2_mcspi {
-	struct work_struct	work;
-	/* lock protects queue and registers */
-	spinlock_t		lock;
-	struct list_head	msg_queue;
 	struct spi_master	*master;
 	/* Virtual base address of the controller */
 	void __iomem		*base;
@@ -131,7 +127,6 @@ struct omap2_mcspi {
 	/* SPI1 has 4 channels, while SPI2 has 2 */
 	struct omap2_mcspi_dma	*dma_channels;
 	struct device		*dev;
-	struct workqueue_struct *wq;
 	struct omap2_mcspi_regs ctx;
 };
 
@@ -275,6 +270,23 @@ static int omap2_mcspi_enable_clocks(struct omap2_mcspi *mcspi)
 	return pm_runtime_get_sync(mcspi->dev);
 }
 
+static int omap2_prepare_transfer(struct spi_master *master)
+{
+	struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
+
+	pm_runtime_get_sync(mcspi->dev);
+	return 0;
+}
+
+static int omap2_unprepare_transfer(struct spi_master *master)
+{
+	struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
+
+	pm_runtime_mark_last_busy(mcspi->dev);
+	pm_runtime_put_autosuspend(mcspi->dev);
+	return 0;
+}
+
 static int mcspi_wait_for_reg_bit(void __iomem *reg, unsigned long bit)
 {
 	unsigned long timeout;
@@ -846,144 +858,122 @@ static void omap2_mcspi_cleanup(struct spi_device *spi)
 	}
 }
 
-static void omap2_mcspi_work(struct work_struct *work)
+static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m)
 {
-	struct omap2_mcspi	*mcspi;
-
-	mcspi = container_of(work, struct omap2_mcspi, work);
-
-	if (omap2_mcspi_enable_clocks(mcspi) < 0)
-		return;
-
-	spin_lock_irq(&mcspi->lock);
 
 	/* We only enable one channel at a time -- the one whose message is
-	 * at the head of the queue -- although this controller would gladly
+	 * -- although this controller would gladly
 	 * arbitrate among multiple channels.  This corresponds to "single
 	 * channel" master mode.  As a side effect, we need to manage the
 	 * chipselect with the FORCE bit ... CS != channel enable.
 	 */
-	while (!list_empty(&mcspi->msg_queue)) {
-		struct spi_message		*m;
-		struct spi_device		*spi;
-		struct spi_transfer		*t = NULL;
-		int				cs_active = 0;
-		struct omap2_mcspi_cs		*cs;
-		struct omap2_mcspi_device_config *cd;
-		int				par_override = 0;
-		int				status = 0;
-		u32				chconf;
-
-		m = container_of(mcspi->msg_queue.next, struct spi_message,
-				 queue);
-
-		list_del_init(&m->queue);
-		spin_unlock_irq(&mcspi->lock);
-
-		spi = m->spi;
-		cs = spi->controller_state;
-		cd = spi->controller_data;
 
-		omap2_mcspi_set_enable(spi, 1);
-		list_for_each_entry(t, &m->transfers, transfer_list) {
-			if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) {
-				status = -EINVAL;
-				break;
-			}
-			if (par_override || t->speed_hz || t->bits_per_word) {
-				par_override = 1;
-				status = omap2_mcspi_setup_transfer(spi, t);
-				if (status < 0)
-					break;
-				if (!t->speed_hz && !t->bits_per_word)
-					par_override = 0;
-			}
+	struct spi_device		*spi;
+	struct spi_transfer		*t = NULL;
+	int				cs_active = 0;
+	struct omap2_mcspi_cs		*cs;
+	struct omap2_mcspi_device_config *cd;
+	int				par_override = 0;
+	int				status = 0;
+	u32				chconf;
 
-			if (!cs_active) {
-				omap2_mcspi_force_cs(spi, 1);
-				cs_active = 1;
-			}
+	spi = m->spi;
+	cs = spi->controller_state;
+	cd = spi->controller_data;
 
-			chconf = mcspi_cached_chconf0(spi);
-			chconf &= ~OMAP2_MCSPI_CHCONF_TRM_MASK;
-			chconf &= ~OMAP2_MCSPI_CHCONF_TURBO;
+	omap2_mcspi_set_enable(spi, 1);
+	list_for_each_entry(t, &m->transfers, transfer_list) {
+		if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) {
+			status = -EINVAL;
+			break;
+		}
+		if (par_override || t->speed_hz || t->bits_per_word) {
+			par_override = 1;
+			status = omap2_mcspi_setup_transfer(spi, t);
+			if (status < 0)
+				break;
+			if (!t->speed_hz && !t->bits_per_word)
+				par_override = 0;
+		}
 
-			if (t->tx_buf == NULL)
-				chconf |= OMAP2_MCSPI_CHCONF_TRM_RX_ONLY;
-			else if (t->rx_buf == NULL)
-				chconf |= OMAP2_MCSPI_CHCONF_TRM_TX_ONLY;
-
-			if (cd && cd->turbo_mode && t->tx_buf == NULL) {
-				/* Turbo mode is for more than one word */
-				if (t->len > ((cs->word_len + 7) >> 3))
-					chconf |= OMAP2_MCSPI_CHCONF_TURBO;
-			}
+		if (!cs_active) {
+			omap2_mcspi_force_cs(spi, 1);
+			cs_active = 1;
+		}
 
-			mcspi_write_chconf0(spi, chconf);
+		chconf = mcspi_cached_chconf0(spi);
+		chconf &= ~OMAP2_MCSPI_CHCONF_TRM_MASK;
+		chconf &= ~OMAP2_MCSPI_CHCONF_TURBO;
 
-			if (t->len) {
-				unsigned	count;
+		if (t->tx_buf == NULL)
+			chconf |= OMAP2_MCSPI_CHCONF_TRM_RX_ONLY;
+		else if (t->rx_buf == NULL)
+			chconf |= OMAP2_MCSPI_CHCONF_TRM_TX_ONLY;
 
-				/* RX_ONLY mode needs dummy data in TX reg */
-				if (t->tx_buf == NULL)
-					__raw_writel(0, cs->base
-							+ OMAP2_MCSPI_TX0);
+		if (cd && cd->turbo_mode && t->tx_buf == NULL) {
+			/* Turbo mode is for more than one word */
+			if (t->len > ((cs->word_len + 7) >> 3))
+				chconf |= OMAP2_MCSPI_CHCONF_TURBO;
+		}
 
-				if (m->is_dma_mapped || t->len >= DMA_MIN_BYTES)
-					count = omap2_mcspi_txrx_dma(spi, t);
-				else
-					count = omap2_mcspi_txrx_pio(spi, t);
-				m->actual_length += count;
+		mcspi_write_chconf0(spi, chconf);
 
-				if (count != t->len) {
-					status = -EIO;
-					break;
-				}
-			}
+		if (t->len) {
+			unsigned	count;
+
+			/* RX_ONLY mode needs dummy data in TX reg */
+			if (t->tx_buf == NULL)
+				__raw_writel(0, cs->base
+						+ OMAP2_MCSPI_TX0);
 
-			if (t->delay_usecs)
-				udelay(t->delay_usecs);
+			if (m->is_dma_mapped || t->len >= DMA_MIN_BYTES)
+				count = omap2_mcspi_txrx_dma(spi, t);
+			else
+				count = omap2_mcspi_txrx_pio(spi, t);
+			m->actual_length += count;
 
-			/* ignore the "leave it on after last xfer" hint */
-			if (t->cs_change) {
-				omap2_mcspi_force_cs(spi, 0);
-				cs_active = 0;
+			if (count != t->len) {
+				status = -EIO;
+				break;
 			}
 		}
 
-		/* Restore defaults if they were overriden */
-		if (par_override) {
-			par_override = 0;
-			status = omap2_mcspi_setup_transfer(spi, NULL);
-		}
+		if (t->delay_usecs)
+			udelay(t->delay_usecs);
 
-		if (cs_active)
+		/* ignore the "leave it on after last xfer" hint */
+		if (t->cs_change) {
 			omap2_mcspi_force_cs(spi, 0);
+			cs_active = 0;
+		}
+	}
+	/* Restore defaults if they were overriden */
+	if (par_override) {
+		par_override = 0;
+		status = omap2_mcspi_setup_transfer(spi, NULL);
+	}
 
-		omap2_mcspi_set_enable(spi, 0);
-
-		m->status = status;
-		m->complete(m->context);
+	if (cs_active)
+		omap2_mcspi_force_cs(spi, 0);
 
-		spin_lock_irq(&mcspi->lock);
-	}
+	omap2_mcspi_set_enable(spi, 0);
 
-	spin_unlock_irq(&mcspi->lock);
+	m->status = status;
 
-	omap2_mcspi_disable_clocks(mcspi);
 }
 
-static int omap2_mcspi_transfer(struct spi_device *spi, struct spi_message *m)
+static int omap2_mcspi_transfer_one_message(struct spi_master *master,
+						struct spi_message *m)
 {
 	struct omap2_mcspi	*mcspi;
-	unsigned long		flags;
 	struct spi_transfer	*t;
 
+	mcspi = spi_master_get_devdata(master);
 	m->actual_length = 0;
 	m->status = 0;
 
 	/* reject invalid messages and transfers */
-	if (list_empty(&m->transfers) || !m->complete)
+	if (list_empty(&m->transfers))
 		return -EINVAL;
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		const void	*tx_buf = t->tx_buf;
@@ -995,7 +985,7 @@ static int omap2_mcspi_transfer(struct spi_device *spi, struct spi_message *m)
 				|| (t->bits_per_word &&
 					(  t->bits_per_word < 4
 					|| t->bits_per_word > 32))) {
-			dev_dbg(&spi->dev, "transfer: %d Hz, %d %s%s, %d bpw\n",
+			dev_dbg(mcspi->dev, "transfer: %d Hz, %d %s%s, %d bpw\n",
 					t->speed_hz,
 					len,
 					tx_buf ? "tx" : "",
@@ -1004,7 +994,7 @@ static int omap2_mcspi_transfer(struct spi_device *spi, struct spi_message *m)
 			return -EINVAL;
 		}
 		if (t->speed_hz && t->speed_hz < (OMAP2_MCSPI_MAX_FREQ >> 15)) {
-			dev_dbg(&spi->dev, "speed_hz %d below minimum %d Hz\n",
+			dev_dbg(mcspi->dev, "speed_hz %d below minimum %d Hz\n",
 				t->speed_hz,
 				OMAP2_MCSPI_MAX_FREQ >> 15);
 			return -EINVAL;
@@ -1014,35 +1004,30 @@ static int omap2_mcspi_transfer(struct spi_device *spi, struct spi_message *m)
 			continue;
 
 		if (tx_buf != NULL) {
-			t->tx_dma = dma_map_single(&spi->dev, (void *) tx_buf,
+			t->tx_dma = dma_map_single(mcspi->dev, (void *) tx_buf,
 					len, DMA_TO_DEVICE);
-			if (dma_mapping_error(&spi->dev, t->tx_dma)) {
-				dev_dbg(&spi->dev, "dma %cX %d bytes error\n",
+			if (dma_mapping_error(mcspi->dev, t->tx_dma)) {
+				dev_dbg(mcspi->dev, "dma %cX %d bytes error\n",
 						'T', len);
 				return -EINVAL;
 			}
 		}
 		if (rx_buf != NULL) {
-			t->rx_dma = dma_map_single(&spi->dev, rx_buf, t->len,
+			t->rx_dma = dma_map_single(mcspi->dev, rx_buf, t->len,
 					DMA_FROM_DEVICE);
-			if (dma_mapping_error(&spi->dev, t->rx_dma)) {
-				dev_dbg(&spi->dev, "dma %cX %d bytes error\n",
+			if (dma_mapping_error(mcspi->dev, t->rx_dma)) {
+				dev_dbg(mcspi->dev, "dma %cX %d bytes error\n",
 						'R', len);
 				if (tx_buf != NULL)
-					dma_unmap_single(&spi->dev, t->tx_dma,
+					dma_unmap_single(mcspi->dev, t->tx_dma,
 							len, DMA_TO_DEVICE);
 				return -EINVAL;
 			}
 		}
 	}
 
-	mcspi = spi_master_get_devdata(spi->master);
-
-	spin_lock_irqsave(&mcspi->lock, flags);
-	list_add_tail(&m->queue, &mcspi->msg_queue);
-	queue_work(mcspi->wq, &mcspi->work);
-	spin_unlock_irqrestore(&mcspi->lock, flags);
-
+	omap2_mcspi_work(mcspi, m);
+	spi_finalize_current_message(master);
 	return 0;
 }
 
@@ -1120,7 +1105,9 @@ static int __devinit omap2_mcspi_probe(struct platform_device *pdev)
 	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
 
 	master->setup = omap2_mcspi_setup;
-	master->transfer = omap2_mcspi_transfer;
+	master->prepare_transfer_hardware = omap2_prepare_transfer;
+	master->unprepare_transfer_hardware = omap2_unprepare_transfer;
+	master->transfer_one_message = omap2_mcspi_transfer_one_message;
 	master->cleanup = omap2_mcspi_cleanup;
 	master->dev.of_node = node;
 
@@ -1145,12 +1132,6 @@ static int __devinit omap2_mcspi_probe(struct platform_device *pdev)
 	mcspi = spi_master_get_devdata(master);
 	mcspi->master = master;
 
-	mcspi->wq = alloc_workqueue(dev_name(&pdev->dev), WQ_MEM_RECLAIM, 1);
-	if (mcspi->wq == NULL) {
-		status = -ENOMEM;
-		goto free_master;
-	}
-
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (r == NULL) {
 		status = -ENODEV;
@@ -1169,10 +1150,7 @@ static int __devinit omap2_mcspi_probe(struct platform_device *pdev)
 	}
 
 	mcspi->dev = &pdev->dev;
-	INIT_WORK(&mcspi->work, omap2_mcspi_work);
 
-	spin_lock_init(&mcspi->lock);
-	INIT_LIST_HEAD(&mcspi->msg_queue);
 	INIT_LIST_HEAD(&mcspi->ctx.cs);
 
 	mcspi->dma_channels = kcalloc(master->num_chipselect,
@@ -1253,7 +1231,6 @@ static int __devexit omap2_mcspi_remove(struct platform_device *pdev)
 
 	spi_unregister_master(master);
 	kfree(dma_channels);
-	destroy_workqueue(mcspi->wq);
 	platform_set_drvdata(pdev, NULL);
 
 	return 0;