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Message-ID: <1399967028-24757-2-git-send-email-peter.ujfalusi@ti.com>
Date: Tue, 13 May 2014 10:43:45 +0300
From: Peter Ujfalusi <peter.ujfalusi@...com>
To: <nsekhar@...com>, <joelf@...com>
CC: <linux@....linux.org.uk>, <vinod.koul@...el.com>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
<devicetree@...r.kernel.org>, <linux-doc@...r.kernel.org>,
<tony@...mide.com>, <bcousson@...libre.com>
Subject: [PATCH 1/4] ARM: edma: Get IP information from HW when booting with DT
>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
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
---
arch/arm/common/edma.c | 128 ++++++++++++++++++++++++++++++-------------------
1 file changed, 79 insertions(+), 49 deletions(-)
diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c
index fade9ada81f8..1a98f3cd4cd9 100644
--- a/arch/arm/common/edma.c
+++ b/arch/arm/common/edma.c
@@ -102,7 +102,16 @@
#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_QDMACH(x) ((x & 0x70) >> 4) /* bits 4-6 */
+#define GET_NUM_INTCH(x) ((x & 0x700) >> 8) /* bits 8-10 */
+#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 MP_EXIST BIT(25)
#define EDMA_MAX_DMACH 64
#define EDMA_MAX_PARAMENTRY 512
@@ -1415,6 +1424,68 @@ void edma_clear_event(unsigned channel)
}
EXPORT_SYMBOL(edma_clear_event);
+static int edma_setup_info_from_hw(struct device *dev,
+ struct edma_soc_info *pdata)
+{
+ int i;
+ u32 value, cccfg, n_tc;
+ s8 (*queue_tc_map)[2], (*queue_priority_map)[2];
+
+ /* Decode the eDMA3 configuration from CCCFG register */
+ cccfg = edma_read(0, EDMA_CCCFG);
+
+ value = GET_NUM_DMACH(cccfg);
+ pdata->n_channel = BIT(value + 1);
+
+ value = GET_NUM_REGN(cccfg);
+ pdata->n_region = BIT(value);
+
+ value = GET_NUM_PAENTRY(cccfg);
+ pdata->n_slot = BIT(value + 4);
+
+ value = GET_NUM_EVQUE(cccfg);
+ n_tc = value + 1;
+
+ dev_dbg(dev, "eDMA3 HW configuration (cccfg: 0x%08x):\n", cccfg);
+ dev_dbg(dev, "n_channel: %u\n", pdata->n_channel);
+ dev_dbg(dev, "n_region: %u\n", pdata->n_region);
+ dev_dbg(dev, "n_slot: %u\n", pdata->n_slot);
+ dev_dbg(dev, "n_tc: %u\n", n_tc);
+
+ pdata->n_cc = 1;
+
+ queue_tc_map = devm_kzalloc(dev, (n_tc + 1) * sizeof(s8), GFP_KERNEL);
+ if (!queue_tc_map)
+ return -ENOMEM;
+
+ for (i = 0; i < n_tc; 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, (n_tc + 1) * sizeof(s8),
+ GFP_KERNEL);
+ if (!queue_priority_map)
+ return -ENOMEM;
+
+ for (i = 0; i < n_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,
@@ -1483,63 +1554,16 @@ 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_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;
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);
@@ -1655,6 +1679,12 @@ static int edma_probe(struct platform_device *pdev)
if (IS_ERR(edmacc_regs_base[j]))
return PTR_ERR(edmacc_regs_base[j]);
+ if (node) {
+ /* Get eDMA3 configuration from IP */
+ ret = edma_setup_info_from_hw(dev, info[j]);
+ if (ret)
+ return ret;
+ }
edma_cc[j] = devm_kzalloc(&pdev->dev, sizeof(struct edma),
GFP_KERNEL);
if (!edma_cc[j])
--
1.9.3
--
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