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Message-ID: <51C42705.1060803@ti.com>
Date: Fri, 21 Jun 2013 15:42:21 +0530
From: Sekhar Nori <nsekhar@...com>
To: Joel A Fernandes <joelagnel@...com>
CC: Tony Lindgren <tony@...mide.com>, Matt Porter <matt@...orter.com>,
Grant Likely <grant.likely@...retlab.ca>,
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Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v12 03/11] ARM: edma: Add EDMA crossbar event mux support
On 6/21/2013 2:36 AM, Joel A Fernandes wrote:
> From: Matt Porter <mporter@...com>
>
>
You should add a description apart from just documenting what you
changed in this patch.
Changes by Joel:
> * Split EDMA xbar support out of original EDMA DT parsing patch
> to keep it easier for review.
> * Rewrite shift and offset calculation.
>
> Suggested-by: Sekhar Nori <nsekhar@...com>
> Suggested by: Andy Shevchenko <andy.shevchenko@...il.com>
> Signed-off-by: Joel A Fernandes <joelagnel@...com>
>
> Reference:
> [1] https://patchwork.kernel.org/patch/2226991/
> ---
> arch/arm/common/edma.c | 62 +++++++++++++++++++++++++++++++++++-
> include/linux/platform_data/edma.h | 1 +
> 2 files changed, 62 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c
> index 407e01e..a03d4f0 100644
> --- a/arch/arm/common/edma.c
> +++ b/arch/arm/common/edma.c
> @@ -568,7 +568,7 @@ static int prepare_unused_channel_list(struct device *dev, void *data)
> (int)pdev->resource[i].start >= 0) {
> ctlr = EDMA_CTLR(pdev->resource[i].start);
> clear_bit(EDMA_CHAN_SLOT(pdev->resource[i].start),
> - edma_cc[ctlr]->edma_unused);
> + edma_cc[ctlr]->edma_unused);
There are two problems with this hunk:
1) It does not belong to this patch. I said that earlier.
2) It actually introduces a new checkpatch issue.
I dropped this hunk.
> }
> }
>
> @@ -1393,6 +1393,52 @@ static int edma_of_read_u32_to_s16_array(const struct device_node *np,
> return 0;
> }
>
> +static int edma_xbar_event_map(struct device *dev,
> + struct device_node *node,
> + struct edma_soc_info *pdata, int len)
> +{
> + int ret = 0;
No need to initialize ret here since you use it only after init.
I fixed that.
> + int i;
> + struct resource res;
> + void __iomem *xbar;
> + const s16 (*xbar_chans)[2];
> + u32 shift, offset, mux;
> +
> + xbar_chans = devm_kzalloc(dev,
> + len/sizeof(s16) + 2*sizeof(s16),
> + GFP_KERNEL);
> + if (!xbar_chans)
> + return -ENOMEM;
> +
> + ret = of_address_to_resource(node, 1, &res);
> + if (ret)
> + return -EIO;
> +
> + xbar = devm_ioremap(dev, res.start, resource_size(&res));
> + if (!xbar)
> + return -ENOMEM;
> +
> + ret = edma_of_read_u32_to_s16_array(node,
> + "ti,edma-xbar-event-map",
> + (s16 *)xbar_chans,
> + len/sizeof(u32));
> + if (ret)
> + return -EIO;
> +
> + for (i = 0; xbar_chans[i][0] != -1; i++) {
> + shift = (xbar_chans[i][1] & 0x03) << 3;
> + offset = xbar_chans[i][1] & 0xfffffffc;
> + mux = readl(xbar + offset);
> + mux &= ~(0xff << shift);
> + mux |= xbar_chans[i][0] << shift;
> + writel(mux, (xbar + offset));
> + }
> +
> + pdata->xbar_chans = xbar_chans;
> +
> + return 0;
> +}
> +
> static int edma_of_parse_dt(struct device *dev,
> struct device_node *node,
> struct edma_soc_info *pdata)
> @@ -1458,6 +1504,10 @@ static int edma_of_parse_dt(struct device *dev,
>
> 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);
> +
> return ret;
> }
>
> @@ -1476,6 +1526,7 @@ static int edma_probe(struct platform_device *pdev)
> int status = -1;
> const s16 (*rsv_chans)[2];
> const s16 (*rsv_slots)[2];
> + const s16 (*xbar_chans)[2];
> int irq[EDMA_MAX_CC] = {0, 0};
> int err_irq[EDMA_MAX_CC] = {0, 0};
> struct resource *r[EDMA_MAX_CC] = {NULL};
> @@ -1591,6 +1642,15 @@ static int edma_probe(struct platform_device *pdev)
> }
> }
>
> + /* Clear the xbar mapped channels in unused list */
> + xbar_chans = info[j]->xbar_chans;
> + if (xbar_chans) {
> + for (i = 0; xbar_chans[i][1] != -1; i++) {
> + off = xbar_chans[i][1];
> + clear_bits(off, 1,
> + edma_cc[j]->edma_unused);
You ignored my request to fix the alignment issue here. I will send the
updated patch separately.
Thanks,
Sekhar
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