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Message-ID: <53764BF2.1030805@ti.com>
Date: Fri, 16 May 2014 12:33:38 -0500
From: Joel Fernandes <joelf@...com>
To: Peter Ujfalusi <peter.ujfalusi@...com>, <nsekhar@...com>,
<arnd@...db.de>
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: Re: [PATCH v3 08/13] ARM: edma: Get IP configuration from HW (number
of channels, tc, etc)
On 05/16/2014 07:17 AM, Peter Ujfalusi wrote:
> 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.
Thanks.
Acked-by: Joel Fernandes <joelf@...com>
>
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
> ---
> arch/arm/common/edma.c | 115 +++++++++++++++++++++++++++++++------------------
> 1 file changed, 73 insertions(+), 42 deletions(-)
>
> diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c
> index aa9473cb0c23..485be42519b9 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_xbar_event_map(struct device *dev, struct device_node *node,
> @@ -1458,50 +1525,16 @@ 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);
> @@ -1621,14 +1654,12 @@ 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]);
>
--
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