Merge tag 'davinci-for-v3.11/soc-2' of git://git.kernel.org/pub/scm/linux/kernel/git/nsekhar/linux-davinci into next/soc

From Sekhar Nori:

DaVinci SoC updates for v3.11 - part 2

This pull request adds DT and runtime PM to
EDMA ARM private API so it can be used on
DT enabled DaVinci and OMAP platforms.

Also adds DMA channel crossbar mapping
support to be used by DT-enabled platforms
which use it.

* tag 'davinci-for-v3.11/soc-2' of git://git.kernel.org/pub/scm/linux/kernel/git/nsekhar/linux-davinci:
  dmaengine: edma: enable build for AM33XX
  ARM: edma: Add EDMA crossbar event mux support
  ARM: edma: Add DT and runtime PM support to the private EDMA API
  dmaengine: edma: Add TI EDMA device tree binding
  ARM: edma: Convert to devm_* api

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

8 files changed, 286 insertions, 72 deletions

diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c
index a1db6cd8cf7..a432e6c1dac 100644
--- a/arch/arm/common/edma.c
+++ b/arch/arm/common/edma.c
@@ -17,6 +17,7 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
+#include <linux/err.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/module.h>
@@ -24,6 +25,13 @@
 #include <linux/platform_device.h>
 #include <linux/io.h>
 #include <linux/slab.h>
+#include <linux/edma.h>
+#include <linux/err.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/of_dma.h>
+#include <linux/of_irq.h>
+#include <linux/pm_runtime.h>
 
 #include <linux/platform_data/edma.h>
 
@@ -1368,32 +1376,236 @@ void edma_clear_event(unsigned channel)
 }
 EXPORT_SYMBOL(edma_clear_event);
 
-/*-----------------------------------------------------------------------*/
+#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_DMADEVICES)
+
+static int edma_of_read_u32_to_s16_array(const struct device_node *np,
+					 const char *propname, s16 *out_values,
+					 size_t sz)
+{
+	int ret;
+
+	ret = of_property_read_u16_array(np, propname, out_values, sz);
+	if (ret)
+		return ret;
+
+	/* Terminate it */
+	*out_values++ = -1;
+	*out_values++ = -1;
+
+	return 0;
+}
+
+static int edma_xbar_event_map(struct device *dev,
+			       struct device_node *node,
+			       struct edma_soc_info *pdata, int len)
+{
+	int ret, i;
+	struct resource res;
+	void __iomem *xbar;
+	const s16 (*xbar_chans)[2];
+	u32 shift, offset, mux;
+
+	xbar_chans = devm_kzalloc(dev,
+				  len/sizeof(s16) + 2*sizeof(s16),
+				  GFP_KERNEL);
+	if (!xbar_chans)
+		return -ENOMEM;
+
+	ret = of_address_to_resource(node, 1, &res);
+	if (ret)
+		return -EIO;
+
+	xbar = devm_ioremap(dev, res.start, resource_size(&res));
+	if (!xbar)
+		return -ENOMEM;
+
+	ret = edma_of_read_u32_to_s16_array(node,
+					    "ti,edma-xbar-event-map",
+					    (s16 *)xbar_chans,
+					    len/sizeof(u32));
+	if (ret)
+		return -EIO;
+
+	for (i = 0; xbar_chans[i][0] != -1; i++) {
+		shift = (xbar_chans[i][1] & 0x03) << 3;
+		offset = xbar_chans[i][1] & 0xfffffffc;
+		mux = readl(xbar + offset);
+		mux &= ~(0xff << shift);
+		mux |= xbar_chans[i][0] << shift;
+		writel(mux, (xbar + offset));
+	}
+
+	pdata->xbar_chans = xbar_chans;
+
+	return 0;
+}
+
+static int edma_of_parse_dt(struct device *dev,
+			    struct device_node *node,
+			    struct edma_soc_info *pdata)
+{
+	int ret = 0, i;
+	u32 value;
+	struct property *prop;
+	size_t sz;
+	struct edma_rsv_info *rsv_info;
+	s8 (*queue_tc_map)[2], (*queue_priority_map)[2];
+
+	memset(pdata, 0, sizeof(struct edma_soc_info));
+
+	ret = of_property_read_u32(node, "dma-channels", &value);
+	if (ret < 0)
+		return ret;
+	pdata->n_channel = value;
+
+	ret = of_property_read_u32(node, "ti,edma-regions", &value);
+	if (ret < 0)
+		return ret;
+	pdata->n_region = value;
+
+	ret = of_property_read_u32(node, "ti,edma-slots", &value);
+	if (ret < 0)
+		return ret;
+	pdata->n_slot = value;
+
+	pdata->n_cc = 1;
+
+	rsv_info = devm_kzalloc(dev, sizeof(struct edma_rsv_info), GFP_KERNEL);
+	if (!rsv_info)
+		return -ENOMEM;
+	pdata->rsv = rsv_info;
+
+	queue_tc_map = devm_kzalloc(dev, 8*sizeof(s8), GFP_KERNEL);
+	if (!queue_tc_map)
+		return -ENOMEM;
+
+	for (i = 0; i < 3; i++) {
+		queue_tc_map[i][0] = i;
+		queue_tc_map[i][1] = i;
+	}
+	queue_tc_map[i][0] = -1;
+	queue_tc_map[i][1] = -1;
+
+	pdata->queue_tc_mapping = queue_tc_map;
+
+	queue_priority_map = devm_kzalloc(dev, 8*sizeof(s8), GFP_KERNEL);
+	if (!queue_priority_map)
+		return -ENOMEM;
+
+	for (i = 0; i < 3; i++) {
+		queue_priority_map[i][0] = i;
+		queue_priority_map[i][1] = i;
+	}
+	queue_priority_map[i][0] = -1;
+	queue_priority_map[i][1] = -1;
+
+	pdata->queue_priority_mapping = queue_priority_map;
+
+	pdata->default_queue = 0;
+
+	prop = of_find_property(node, "ti,edma-xbar-event-map", &sz);
+	if (prop)
+		ret = edma_xbar_event_map(dev, node, pdata, sz);
+
+	return ret;
+}
+
+static struct of_dma_filter_info edma_filter_info = {
+	.filter_fn = edma_filter_fn,
+};
+
+static struct edma_soc_info *edma_setup_info_from_dt(struct device *dev,
+						      struct device_node *node)
+{
+	struct edma_soc_info *info;
+	int ret;
+
+	info = devm_kzalloc(dev, sizeof(struct edma_soc_info), GFP_KERNEL);
+	if (!info)
+		return ERR_PTR(-ENOMEM);
+
+	ret = edma_of_parse_dt(dev, node, info);
+	if (ret)
+		return ERR_PTR(ret);
+
+	dma_cap_set(DMA_SLAVE, edma_filter_info.dma_cap);
+	of_dma_controller_register(dev->of_node, of_dma_simple_xlate,
+				   &edma_filter_info);
 
-static int __init edma_probe(struct platform_device *pdev)
+	return info;
+}
+#else
+static struct edma_soc_info *edma_setup_info_from_dt(struct device *dev,
+						      struct device_node *node)
+{
+	return ERR_PTR(-ENOSYS);
+}
+#endif
+
+static int edma_probe(struct platform_device *pdev)
 {
 	struct edma_soc_info	**info = pdev->dev.platform_data;
-	const s8		(*queue_priority_mapping)[2];
-	const s8		(*queue_tc_mapping)[2];
+	struct edma_soc_info    *ninfo[EDMA_MAX_CC] = {NULL};
+	s8		(*queue_priority_mapping)[2];
+	s8		(*queue_tc_mapping)[2];
 	int			i, j, off, ln, found = 0;
 	int			status = -1;
 	const s16		(*rsv_chans)[2];
 	const s16		(*rsv_slots)[2];
+	const s16		(*xbar_chans)[2];
 	int			irq[EDMA_MAX_CC] = {0, 0};
 	int			err_irq[EDMA_MAX_CC] = {0, 0};
 	struct resource		*r[EDMA_MAX_CC] = {NULL};
-	resource_size_t		len[EDMA_MAX_CC];
+	struct resource		res[EDMA_MAX_CC];
 	char			res_name[10];
 	char			irq_name[10];
+	struct device_node	*node = pdev->dev.of_node;
+	struct device		*dev = &pdev->dev;
+	int			ret;
+
+	if (node) {
+		/* Check if this is a second instance registered */
+		if (arch_num_cc) {
+			dev_err(dev, "only one EDMA instance is supported via DT\n");
+			return -ENODEV;
+		}
+
+		ninfo[0] = edma_setup_info_from_dt(dev, node);
+		if (IS_ERR(ninfo[0])) {
+			dev_err(dev, "failed to get DT data\n");
+			return PTR_ERR(ninfo[0]);
+		}
+
+		info = ninfo;
+	}
 
 	if (!info)
 		return -ENODEV;
 
+	pm_runtime_enable(dev);
+	ret = pm_runtime_get_sync(dev);
+	if (ret < 0) {
+		dev_err(dev, "pm_runtime_get_sync() failed\n");
+		return ret;
+	}
+
 	for (j = 0; j < EDMA_MAX_CC; j++) {
-		sprintf(res_name, "edma_cc%d", j);
-		r[j] = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+		if (!info[j]) {
+			if (!found)
+				return -ENODEV;
+			break;
+		}
+		if (node) {
+			ret = of_address_to_resource(node, j, &res[j]);
+			if (!ret)
+				r[j] = &res[j];
+		} else {
+			sprintf(res_name, "edma_cc%d", j);
+			r[j] = platform_get_resource_byname(pdev,
+						IORESOURCE_MEM,
 						res_name);
-		if (!r[j] || !info[j]) {
+		}
+		if (!r[j]) {
 			if (found)
 				break;
 			else
@@ -1402,26 +1614,14 @@ static int __init edma_probe(struct platform_device *pdev)
 			found = 1;
 		}
 
-		len[j] = resource_size(r[j]);
+		edmacc_regs_base[j] = devm_ioremap_resource(&pdev->dev, r[j]);
+		if (IS_ERR(edmacc_regs_base[j]))
+			return PTR_ERR(edmacc_regs_base[j]);
 
-		r[j] = request_mem_region(r[j]->start, len[j],
-			dev_name(&pdev->dev));
-		if (!r[j]) {
-			status = -EBUSY;
-			goto fail1;
-		}
-
-		edmacc_regs_base[j] = ioremap(r[j]->start, len[j]);
-		if (!edmacc_regs_base[j]) {
-			status = -EBUSY;
-			goto fail1;
-		}
-
-		edma_cc[j] = kzalloc(sizeof(struct edma), GFP_KERNEL);
-		if (!edma_cc[j]) {
-			status = -ENOMEM;
-			goto fail1;
-		}
+		edma_cc[j] = devm_kzalloc(&pdev->dev, sizeof(struct edma),
+					  GFP_KERNEL);
+		if (!edma_cc[j])
+			return -ENOMEM;
 
 		edma_cc[j]->num_channels = min_t(unsigned, info[j]->n_channel,
 							EDMA_MAX_DMACH);
@@ -1452,7 +1652,7 @@ static int __init edma_probe(struct platform_device *pdev)
 					off = rsv_chans[i][0];
 					ln = rsv_chans[i][1];
 					clear_bits(off, ln,
-						edma_cc[j]->edma_unused);
+						  edma_cc[j]->edma_unused);
 				}
 			}
 
@@ -1468,26 +1668,48 @@ static int __init edma_probe(struct platform_device *pdev)
 			}
 		}
 
-		sprintf(irq_name, "edma%d", j);
-		irq[j] = platform_get_irq_byname(pdev, irq_name);
+		/* Clear the xbar mapped channels in unused list */
+		xbar_chans = info[j]->xbar_chans;
+		if (xbar_chans) {
+			for (i = 0; xbar_chans[i][1] != -1; i++) {
+				off = xbar_chans[i][1];
+				clear_bits(off, 1,
+					   edma_cc[j]->edma_unused);
+			}
+		}
+
+		if (node) {
+			irq[j] = irq_of_parse_and_map(node, 0);
+		} else {
+			sprintf(irq_name, "edma%d", j);
+			irq[j] = platform_get_irq_byname(pdev, irq_name);
+		}
 		edma_cc[j]->irq_res_start = irq[j];
-		status = request_irq(irq[j], dma_irq_handler, 0, "edma",
-					&pdev->dev);
+		status = devm_request_irq(&pdev->dev, irq[j],
+					  dma_irq_handler, 0, "edma",
+					  &pdev->dev);
 		if (status < 0) {
-			dev_dbg(&pdev->dev, "request_irq %d failed --> %d\n",
+			dev_dbg(&pdev->dev,
+				"devm_request_irq %d failed --> %d\n",
 				irq[j], status);
-			goto fail;
+			return status;
 		}
 
-		sprintf(irq_name, "edma%d_err", j);
-		err_irq[j] = platform_get_irq_byname(pdev, irq_name);
+		if (node) {
+			err_irq[j] = irq_of_parse_and_map(node, 2);
+		} else {
+			sprintf(irq_name, "edma%d_err", j);
+			err_irq[j] = platform_get_irq_byname(pdev, irq_name);
+		}
 		edma_cc[j]->irq_res_end = err_irq[j];
-		status = request_irq(err_irq[j], dma_ccerr_handler, 0,
-					"edma_error", &pdev->dev);
+		status = devm_request_irq(&pdev->dev, err_irq[j],
+					  dma_ccerr_handler, 0,
+					  "edma_error", &pdev->dev);
 		if (status < 0) {
-			dev_dbg(&pdev->dev, "request_irq %d failed --> %d\n",
+			dev_dbg(&pdev->dev,
+				"devm_request_irq %d failed --> %d\n",
 				err_irq[j], status);
-			goto fail;
+			return status;
 		}
 
 		for (i = 0; i < edma_cc[j]->num_channels; i++)
@@ -1522,28 +1744,19 @@ static int __init edma_probe(struct platform_device *pdev)
 	}
 
 	return 0;
-
-fail:
-	for (i = 0; i < EDMA_MAX_CC; i++) {
-		if (err_irq[i])
-			free_irq(err_irq[i], &pdev->dev);
-		if (irq[i])
-			free_irq(irq[i], &pdev->dev);
-	}
-fail1:
-	for (i = 0; i < EDMA_MAX_CC; i++) {
-		if (r[i])
-			release_mem_region(r[i]->start, len[i]);
-		if (edmacc_regs_base[i])
-			iounmap(edmacc_regs_base[i]);
-		kfree(edma_cc[i]);
-	}
-	return status;
 }
 
+static const struct of_device_id edma_of_ids[] = {
+	{ .compatible = "ti,edma3", },
+	{}
+};
 
 static struct platform_driver edma_driver = {
-	.driver.name	= "edma",
+	.driver = {
+		.name	= "edma",
+		.of_match_table = edma_of_ids,
+	},
+	.probe = edma_probe,
 };
 
 static int __init edma_init(void)
diff --git a/arch/arm/mach-davinci/devices-da8xx.c b/arch/arm/mach-davinci/devices-da8xx.c
index bf572525175..eb254fe861a 100644
--- a/arch/arm/mach-davinci/devices-da8xx.c
+++ b/arch/arm/mach-davinci/devices-da8xx.c
@@ -105,27 +105,27 @@ struct platform_device da8xx_serial_device = {
 	},
 };
 
-static const s8 da8xx_queue_tc_mapping[][2] = {
+static s8 da8xx_queue_tc_mapping[][2] = {
 	/* {event queue no, TC no} */
 	{0, 0},
 	{1, 1},
 	{-1, -1}
 };
 
-static const s8 da8xx_queue_priority_mapping[][2] = {
+static s8 da8xx_queue_priority_mapping[][2] = {
 	/* {event queue no, Priority} */
 	{0, 3},
 	{1, 7},
 	{-1, -1}
 };
 
-static const s8 da850_queue_tc_mapping[][2] = {
+static s8 da850_queue_tc_mapping[][2] = {
 	/* {event queue no, TC no} */
 	{0, 0},
 	{-1, -1}
 };
 
-static const s8 da850_queue_priority_mapping[][2] = {
+static s8 da850_queue_priority_mapping[][2] = {
 	/* {event queue no, Priority} */
 	{0, 3},
 	{-1, -1}
diff --git a/arch/arm/mach-davinci/devices-tnetv107x.c b/arch/arm/mach-davinci/devices-tnetv107x.c
index 612a0856e9c..128cb9ae80f 100644
--- a/arch/arm/mach-davinci/devices-tnetv107x.c
+++ b/arch/arm/mach-davinci/devices-tnetv107x.c
@@ -58,14 +58,14 @@
 #define TNETV107X_DMACH_SDIO1_RX		28
 #define TNETV107X_DMACH_SDIO1_TX		29
 
-static const s8 edma_tc_mapping[][2] = {
+static s8 edma_tc_mapping[][2] = {
 	/* event queue no	TC no	*/
 	{	 0,		 0	},
 	{	 1,		 1	},
 	{	-1,		-1	}
 };
 
-static const s8 edma_priority_mapping[][2] = {
+static s8 edma_priority_mapping[][2] = {
 	/* event queue no	Prio	*/
 	{	 0,		 3	},
 	{	 1,		 7	},
diff --git a/arch/arm/mach-davinci/dm355.c b/arch/arm/mach-davinci/dm355.c
index 526cf7d06d0..42ef53f62c6 100644
--- a/arch/arm/mach-davinci/dm355.c
+++ b/arch/arm/mach-davinci/dm355.c
@@ -569,7 +569,7 @@ static u8 dm355_default_priorities[DAVINCI_N_AINTC_IRQ] = {
 
 /*----------------------------------------------------------------------*/
 
-static const s8
+static s8
 queue_tc_mapping[][2] = {
 	/* {event queue no, TC no} */
 	{0, 0},
@@ -577,7 +577,7 @@ queue_tc_mapping[][2] = {
 	{-1, -1},
 };
 
-static const s8
+static s8
 queue_priority_mapping[][2] = {
 	/* {event queue no, Priority} */
 	{0, 3},
diff --git a/arch/arm/mach-davinci/dm365.c b/arch/arm/mach-davinci/dm365.c
index c4b741173c0..fa7af5eda52 100644
--- a/arch/arm/mach-davinci/dm365.c
+++ b/arch/arm/mach-davinci/dm365.c
@@ -826,7 +826,7 @@ static u8 dm365_default_priorities[DAVINCI_N_AINTC_IRQ] = {
 };
 
 /* Four Transfer Controllers on DM365 */
-static const s8
+static s8
 dm365_queue_tc_mapping[][2] = {
 	/* {event queue no, TC no} */
 	{0, 0},
@@ -836,7 +836,7 @@ dm365_queue_tc_mapping[][2] = {
 	{-1, -1},
 };
 
-static const s8
+static s8
 dm365_queue_priority_mapping[][2] = {
 	/* {event queue no, Priority} */
 	{0, 7},
diff --git a/arch/arm/mach-davinci/dm644x.c b/arch/arm/mach-davinci/dm644x.c
index dd156d58fe6..a49d18246fe 100644
--- a/arch/arm/mach-davinci/dm644x.c
+++ b/arch/arm/mach-davinci/dm644x.c
@@ -497,7 +497,7 @@ static u8 dm644x_default_priorities[DAVINCI_N_AINTC_IRQ] = {
 
 /*----------------------------------------------------------------------*/
 
-static const s8
+static s8
 queue_tc_mapping[][2] = {
 	/* {event queue no, TC no} */
 	{0, 0},
@@ -505,7 +505,7 @@ queue_tc_mapping[][2] = {
 	{-1, -1},
 };
 
-static const s8
+static s8
 queue_priority_mapping[][2] = {
 	/* {event queue no, Priority} */
 	{0, 3},
diff --git a/arch/arm/mach-davinci/dm646x.c b/arch/arm/mach-davinci/dm646x.c
index 6d52a321a8c..d1259e80141 100644
--- a/arch/arm/mach-davinci/dm646x.c
+++ b/arch/arm/mach-davinci/dm646x.c
@@ -531,7 +531,7 @@ static u8 dm646x_default_priorities[DAVINCI_N_AINTC_IRQ] = {
 /*----------------------------------------------------------------------*/
 
 /* Four Transfer Controllers on DM646x */
-static const s8
+static s8
 dm646x_queue_tc_mapping[][2] = {
 	/* {event queue no, TC no} */
 	{0, 0},
@@ -541,7 +541,7 @@ dm646x_queue_tc_mapping[][2] = {
 	{-1, -1},
 };
 
-static const s8
+static s8
 dm646x_queue_priority_mapping[][2] = {
 	/* {event queue no, Priority} */
 	{0, 4},
diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig
index 1bfe9ee0331..a5679a68cd3 100644
--- a/arch/arm/mach-omap2/Kconfig
+++ b/arch/arm/mach-omap2/Kconfig
@@ -17,6 +17,7 @@ config ARCH_OMAP2PLUS
 	select PROC_DEVICETREE if PROC_FS
 	select SOC_BUS
 	select SPARSE_IRQ
+	select TI_PRIV_EDMA
 	select USE_OF
 	help
 	  Systems based on OMAP2, OMAP3, OMAP4 or OMAP5