[RFC PATCH 03/13] ARM: edma: add DT and runtime PM support for AM335x

[Matt Porter]

Adds support for parsing the TI EDMA DT data into the required
EDMA private API platform data.

Calls runtime PM API only in the DT case in order to unidle the
associated hwmods on AM335x.

Signed-off-by: Matt Porter <mporter@xxxxxx>
---
 arch/arm/common/edma.c           |  252 ++++++++++++++++++++++++++++++++++++--
 arch/arm/include/asm/mach/edma.h |    8 +-
 2 files changed, 244 insertions(+), 16 deletions(-)

diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c
index 001d268..f337f81 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 <asm/mach/edma.h>
 
@@ -1366,30 +1373,236 @@ 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_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;
+	s16 (*rsv_chans)[2], (*rsv_slots)[2];
+	s8 (*queue_tc_map)[2], (*queue_priority_map)[2];
+
+	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;
+	/* This is unused */
+	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)
+		return -EINVAL;
+
+	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)
+		return -EINVAL;
+
+	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 (!rsv_slots)
+		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 (!rsv_slots)
+		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;
+
+	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;
-	const s8		(*queue_priority_mapping)[2];
-	const s8		(*queue_tc_mapping)[2];
+	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];
+	s16			(*rsv_chans)[2];
+	s16			(*rsv_slots)[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		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;
+	struct edma_soc_info	*pdata;
+
+	if (node) {
+		int ret;
+		pdata = devm_kzalloc(dev,
+				     sizeof(struct edma_soc_info),
+				     GFP_KERNEL);
+		edma_of_parse_dt(dev, node, pdata);
+		info = &pdata;
+		dma_cap_set(DMA_SLAVE, edma_filter_info.dma_cap);
+		of_dma_controller_register(dev->of_node,
+					   of_dma_simple_xlate,
+					   &edma_filter_info);
+		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;
+		}
+	}
 
 	if (!info)
 		return -ENODEV;
 
 	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 (node) {
+			int err;
+			err = of_address_to_resource(node, 0, &res[j]);
+			if (err) {
+				dev_err(dev,
+					"unable to find 'reg' property\n");
+				return -EIO;
+			}
+			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 (found)
 				break;
@@ -1465,8 +1678,12 @@ static int __init edma_probe(struct platform_device *pdev)
 			}
 		}
 
-		sprintf(irq_name, "edma%d", j);
-		irq[j] = platform_get_irq_byname(pdev, irq_name);
+		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 +1693,12 @@ 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 +1759,17 @@ 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)
@@ -1548,4 +1777,3 @@ static int __init edma_init(void)
 	return platform_driver_probe(&edma_driver, edma_probe);
 }
 arch_initcall(edma_init);
-
diff --git a/arch/arm/include/asm/mach/edma.h b/arch/arm/include/asm/mach/edma.h
index 7e84c90..ce5f6f8 100644
--- a/arch/arm/include/asm/mach/edma.h
+++ b/arch/arm/include/asm/mach/edma.h
@@ -237,8 +237,8 @@ void edma_resume(unsigned channel);
 
 struct edma_rsv_info {
 
-	const s16	(*rsv_chans)[2];
-	const s16	(*rsv_slots)[2];
+	s16		(*rsv_chans)[2];
+	s16		(*rsv_slots)[2];
 };
 
 /* platform_data for EDMA driver */
@@ -260,8 +260,8 @@ struct edma_soc_info {
 	/* Resource reservation for other cores */
 	struct edma_rsv_info	*rsv;
 
-	const s8	(*queue_tc_mapping)[2];
-	const s8	(*queue_priority_mapping)[2];
+	s8	(*queue_tc_mapping)[2];
+	s8	(*queue_priority_mapping)[2];
 };
 
 #endif
-- 
1.7.9.5

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