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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>
This commit is contained in:
Peter Ujfalusi 2014-05-16 15:17:15 +03:00 committed by Sekhar Nori
parent 643efcff52
commit 6d10c3950b
1 changed files with 73 additions and 42 deletions
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115
arch/arm/common/edma.c
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@ -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]);