ARM: edma: Get IP configuration from HW (number of channels, tc, etc)

From CCCFG register of eDMA3 we can get all the needed information for the
driver about the IP:
Number of channels: NUM_DMACH
Number of regions: NUM_REGN
Number of slots (PaRAM sets): NUM_PAENTRY
Number of TC/EQ: NUM_EVQUE

In case when booted with DT or the queue_priority_mapping is not provided
set up a default priority map.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Joel Fernandes <joelf@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>

1 files changed, 73 insertions, 42 deletions

diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c
index 79097d880d50..eeea011480eb 100644
--- a/arch/arm/common/edma.c
+++ b/arch/arm/common/edma.c
@@ -102,7 +102,13 @@
 #define PARM_OFFSET(param_no)   (EDMA_PARM + ((param_no) << 5))
 
 #define EDMA_DCHMAP     0x0100  /* 64 registers */
-#define CHMAP_EXIST     BIT(24)
+
+/* CCCFG register */
+#define GET_NUM_DMACH(x)        (x & 0x7) /* bits 0-2 */
+#define GET_NUM_PAENTRY(x)      ((x & 0x7000) >> 12) /* bits 12-14 */
+#define GET_NUM_EVQUE(x)        ((x & 0x70000) >> 16) /* bits 16-18 */
+#define GET_NUM_REGN(x)         ((x & 0x300000) >> 20) /* bits 20-21 */
+#define CHMAP_EXIST             BIT(24)
 
 #define EDMA_MAX_DMACH           64
 #define EDMA_MAX_PARAMENTRY     512
@@ -1408,6 +1414,67 @@ void edma_clear_event(unsigned channel)
 }
 EXPORT_SYMBOL(edma_clear_event);
 
+static int edma_setup_from_hw(struct device *dev, struct edma_soc_info *pdata,
+                              struct edma *edma_cc)
+{
+        int i;
+        u32 value, cccfg;
+        s8 (*queue_priority_map)[2];
+
+        /* Decode the eDMA3 configuration from CCCFG register */
+        cccfg = edma_read(0, EDMA_CCCFG);
+
+        value = GET_NUM_REGN(cccfg);
+        edma_cc->num_region = BIT(value);
+
+        value = GET_NUM_DMACH(cccfg);
+        edma_cc->num_channels = BIT(value + 1);
+
+        value = GET_NUM_PAENTRY(cccfg);
+        edma_cc->num_slots = BIT(value + 4);
+
+        value = GET_NUM_EVQUE(cccfg);
+        edma_cc->num_tc = value + 1;
+
+        dev_dbg(dev, "eDMA3 HW configuration (cccfg: 0x%08x):\n", cccfg);
+        dev_dbg(dev, "num_region: %u\n", edma_cc->num_region);
+        dev_dbg(dev, "num_channel: %u\n", edma_cc->num_channels);
+        dev_dbg(dev, "num_slot: %u\n", edma_cc->num_slots);
+        dev_dbg(dev, "num_tc: %u\n", edma_cc->num_tc);
+
+        /* Nothing need to be done if queue priority is provided */
+        if (pdata->queue_priority_mapping)
+                return 0;
+
+        /*
+         * Configure TC/queue priority as follows:
+         * Q0 - priority 0
+         * Q1 - priority 1
+         * Q2 - priority 2
+         * ...
+         * The meaning of priority numbers: 0 highest priority, 7 lowest
+         * priority. So Q0 is the highest priority queue and the last queue has
+         * the lowest priority.
+         */
+        queue_priority_map = devm_kzalloc(dev,
+                                          (edma_cc->num_tc + 1) * sizeof(s8),
+                                          GFP_KERNEL);
+        if (!queue_priority_map)
+                return -ENOMEM;
+
+        for (i = 0; i < edma_cc->num_tc; 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;
+
+        return 0;
+}
+
 #if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_DMADEVICES)
 
 static int edma_of_read_u32_to_s16_array(const struct device_node *np,
@@ -1476,50 +1543,16 @@ static int edma_of_parse_dt(struct device *dev,
                             struct device_node *node,
                             struct edma_soc_info *pdata)
 {
-        int ret = 0, i;
-        u32 value;
+        int ret = 0;
         struct property *prop;
         size_t sz;
         struct edma_rsv_info *rsv_info;
-        s8 (*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_tc = 3;
 
         rsv_info = devm_kzalloc(dev, sizeof(struct edma_rsv_info), GFP_KERNEL);
         if (!rsv_info)
                 return -ENOMEM;
         pdata->rsv = rsv_info;
 
-        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);
@@ -1639,14 +1672,12 @@ static int edma_probe(struct platform_device *pdev)
                 if (!edma_cc[j])
                         return -ENOMEM;
 
-                edma_cc[j]->num_channels = min_t(unsigned, info[j]->n_channel,
-                                                        EDMA_MAX_DMACH);
-                edma_cc[j]->num_slots = min_t(unsigned, info[j]->n_slot,
-                                                        EDMA_MAX_PARAMENTRY);
-                edma_cc[j]->num_tc = info[j]->n_tc;
+                /* Get eDMA3 configuration from IP */
+                ret = edma_setup_from_hw(dev, info[j], edma_cc[j]);
+                if (ret)
+                        return ret;
 
                 edma_cc[j]->default_queue = info[j]->default_queue;
-                edma_cc[j]->num_region = info[j]->n_region;
 
                 dev_dbg(&pdev->dev, "DMA REG BASE ADDR=%p\n",
                         edmacc_regs_base[j]);