[PATCH v4 03/14] ARM: edma: add AM33XX support to the private EDMA API

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Adds support for parsing the TI EDMA DT data into the required
EDMA private API platform data. Enables runtime PM support to
initialize the EDMA hwmod. Adds AM33XX EMDA crossbar event mux
support.

Signed-off-by: Matt Porter <mporter@xxxxxx>
---
 arch/arm/common/edma.c             |  314 ++++++++++++++++++++++++++++++++++--
 include/linux/platform_data/edma.h |    1 +
 2 files changed, 306 insertions(+), 9 deletions(-)

diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c
index a3d189d..1951d63 100644
--- a/arch/arm/common/edma.c
+++ b/arch/arm/common/edma.c
@@ -24,6 +24,13 @@
 #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>
 
@@ -723,6 +730,9 @@ EXPORT_SYMBOL(edma_free_channel);
  */
 int edma_alloc_slot(unsigned ctlr, int slot)
 {
+	if (!edma_cc[ctlr])
+		return -EINVAL;
+
 	if (slot >= 0)
 		slot = EDMA_CHAN_SLOT(slot);
 
@@ -1366,31 +1376,291 @@ void edma_clear_event(unsigned channel)
 EXPORT_SYMBOL(edma_clear_event);
 
 /*-----------------------------------------------------------------------*/
+static int edma_of_read_u32_to_s8_array(const struct device_node *np,
+					 const char *propname, s8 *out_values,
+					 size_t sz)
+{
+	struct property *prop = of_find_property(np, propname, NULL);
+	const __be32 *val;
+
+	if (!prop)
+		return -EINVAL;
+	if (!prop->value)
+		return -ENODATA;
+	if ((sz * sizeof(u32)) > prop->length)
+		return -EOVERFLOW;
+
+	val = prop->value;
+
+	while (sz--)
+		*out_values++ = (s8)(be32_to_cpup(val++) & 0xff);
+
+	/* Terminate it */
+	*out_values++ = -1;
+	*out_values++ = -1;
+
+	return 0;
+}
+
+static int edma_of_read_u32_to_s16_array(const struct device_node *np,
+					 const char *propname, s16 *out_values,
+					 size_t sz)
+{
+	struct property *prop = of_find_property(np, propname, NULL);
+	const __be32 *val;
+
+	if (!prop)
+		return -EINVAL;
+	if (!prop->value)
+		return -ENODATA;
+	if ((sz * sizeof(u32)) > prop->length)
+		return -EOVERFLOW;
+
+	val = prop->value;
+
+	while (sz--)
+		*out_values++ = (s16)(be32_to_cpup(val++) & 0xffff);
+
+	/* 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 = 0;
+	int i;
+	struct resource res;
+	void *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 (IS_ERR_VALUE(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 (IS_ERR_VALUE(ret))
+		return -EIO;
+
+	for (i = 0; xbar_chans[i][0] != -1; i++) {
+		shift = (xbar_chans[i][1] % 4) * 8;
+		offset = xbar_chans[i][1] >> 2;
+		offset <<= 2;
+		mux = readl((void *)((u32)xbar + offset));
+		mux &= ~(0xff << shift);
+		mux |= xbar_chans[i][0] << shift;
+		writel(mux, (void *)((u32)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;
+	u32 value;
+	struct property *prop;
+	size_t sz;
+	struct edma_rsv_info *rsv_info;
+	const s16 (*rsv_chans)[2], (*rsv_slots)[2];
+	const 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;
+	pdata->n_tc = 3;
+
+	rsv_info =
+		devm_kzalloc(dev, sizeof(struct edma_rsv_info), GFP_KERNEL);
+	if (!rsv_info)
+		return -ENOMEM;
+	pdata->rsv = rsv_info;
+
+	/* Build the reserved channel/slots arrays */
+	prop = of_find_property(node, "ti,edma-reserved-channels", &sz);
+	if (prop) {
+		rsv_chans = devm_kzalloc(dev,
+					 sz/sizeof(s16) + 2*sizeof(s16),
+					 GFP_KERNEL);
+		if (!rsv_chans)
+			return -ENOMEM;
+		pdata->rsv->rsv_chans = rsv_chans;
+
+		ret = edma_of_read_u32_to_s16_array(node,
+						    "ti,edma-reserved-channels",
+						    (s16 *)rsv_chans,
+						    sz/sizeof(u32));
+		if (ret < 0)
+			return ret;
+	}
+
+	prop = of_find_property(node, "ti,edma-reserved-slots", &sz);
+	if (prop) {
+		rsv_slots = devm_kzalloc(dev,
+					 sz/sizeof(s16) + 2*sizeof(s16),
+					 GFP_KERNEL);
+		if (!rsv_slots)
+			return -ENOMEM;
+		pdata->rsv->rsv_slots = rsv_slots;
+
+		ret = edma_of_read_u32_to_s16_array(node,
+						    "ti,edma-reserved-slots",
+						    (s16 *)rsv_slots,
+						    sz/sizeof(u32));
+		if (ret < 0)
+			return ret;
+	}
+
+	prop = of_find_property(node, "ti,edma-queue-tc-map", &sz);
+	if (!prop)
+		return -EINVAL;
+
+	queue_tc_map = devm_kzalloc(dev,
+				    sz/sizeof(s8) + 2*sizeof(s8),
+				    GFP_KERNEL);
+	if (!queue_tc_map)
+		return -ENOMEM;
+	pdata->queue_tc_mapping = queue_tc_map;
+
+	ret = edma_of_read_u32_to_s8_array(node,
+					   "ti,edma-queue-tc-map",
+					   (s8 *)queue_tc_map,
+					   sz/sizeof(u32));
+	if (ret < 0)
+		return ret;
+
+	prop = of_find_property(node, "ti,edma-queue-priority-map", &sz);
+	if (!prop)
+		return -EINVAL;
+
+	queue_priority_map = devm_kzalloc(dev,
+					  sz/sizeof(s8) + 2*sizeof(s8),
+					  GFP_KERNEL);
+	if (!queue_priority_map)
+		return -ENOMEM;
+	pdata->queue_priority_mapping = queue_priority_map;
+
+	ret = edma_of_read_u32_to_s8_array(node,
+					   "ti,edma-queue-tc-map",
+					   (s8 *)queue_priority_map,
+					   sz/sizeof(u32));
+	if (ret < 0)
+		return ret;
+
+	ret = of_property_read_u32(node, "ti,edma-default-queue", &value);
+	if (ret < 0)
+		return ret;
+	pdata->default_queue = value;
+
+	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 int __init edma_probe(struct platform_device *pdev)
 {
 	struct edma_soc_info	**info = pdev->dev.platform_data;
+	struct edma_soc_info	*ninfo[EDMA_MAX_CC] = {NULL, NULL};
+	struct edma_soc_info	tmpinfo;
 	const s8		(*queue_priority_mapping)[2];
 	const 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};
+	struct resource		*r[EDMA_MAX_CC] = {NULL, NULL};
+	struct resource		res[EDMA_MAX_CC];
 	resource_size_t		len[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) {
+		info = ninfo;
+		edma_of_parse_dt(dev, node, &tmpinfo);
+		info[0] = &tmpinfo;
+
+		dma_cap_set(DMA_SLAVE, edma_filter_info.dma_cap);
+		of_dma_controller_register(dev->of_node,
+					   of_dma_simple_xlate,
+					   &edma_filter_info);
+	}
 
 	if (!info)
 		return -ENODEV;
 
+	pm_runtime_enable(dev);
+	ret = pm_runtime_get_sync(dev);
+	if (IS_ERR_VALUE(ret)) {
+		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 (!IS_ERR_VALUE(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
@@ -1465,8 +1735,22 @@ 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);
@@ -1476,8 +1760,12 @@ static int __init edma_probe(struct platform_device *pdev)
 			goto fail;
 		}
 
-		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);
@@ -1538,9 +1826,17 @@ fail1:
 	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/include/linux/platform_data/edma.h b/include/linux/platform_data/edma.h
index 2344ea2..ffc1fb2 100644
--- a/include/linux/platform_data/edma.h
+++ b/include/linux/platform_data/edma.h
@@ -177,6 +177,7 @@ struct edma_soc_info {
 
 	const s8	(*queue_tc_mapping)[2];
 	const s8	(*queue_priority_mapping)[2];
+	const s16	(*xbar_chans)[2];
 };
 
 #endif
-- 
1.7.9.5

--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Linux Arm (vger)]     [ARM Kernel]     [ARM MSM]     [Linux Tegra]     [Linux WPAN Networking]     [Linux Wireless Networking]     [Maemo Users]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Trails]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux