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Date: Wed, 05 Sep 2012 12:20:06 +0300
From: Peter Ujfalusi <peter.ujfalusi@...com>
To: Vaibhav Hiremath <hvaibhav@...com>
CC: linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
Benoit Cousson <b-cousson@...com>,
Tony Lindgren <tony@...mide.com>,
Paul Walmsley <paul@...an.com>, Kevin Hilman <khilman@...com>
Subject: Re: [RFC PATCH] ARM: OMAP2+: omap-device: Do not overwrite resources
allocated by OF layer
On 08/29/2012 12:48 PM, Vaibhav Hiremath wrote:
> With the new devices (like, AM33XX and OMAP5) we now only support
> DT boot mode of operation and now it is the time to start killing
> slowly the dependency on hwmod, so with this patch, we are starting
> with device resources.
> The idea here is implemented considering to both boot modes -
> - DT boot mode
> OF framework will construct the resource structure (currently
> does for MEM & IRQ resource) and we should respect/use these
> resources, killing hwmod dependency.
> If pdev->num_resources > 0, we assume that MEM & IRQ resources
> have been allocated by OF layer already (through DTB).
>
> Once DMA resource is available from OF layer, we should
> kill filling any resources from hwmod.
>
> - Non-DT boot mode
> Here, pdev->num_resources = 0, and we should get all the
> resources from hwmod (following existing steps)
>
> Signed-off-by: Vaibhav Hiremath <hvaibhav@...com>
> Cc: Benoit Cousson <b-cousson@...com>
> Cc: Tony Lindgren <tony@...mide.com>
> Cc: Paul Walmsley <paul@...an.com>
> Cc: Kevin Hilman <khilman@...com>
> ---
> This patch is tested on BeagleBone and AM37xEVM.
I tried this on OMAP3 (with McBSP/twl4030-audio/omap-twl4030 DT boot), OMAP4
(McPDM, DMIC DT), and on OMAP5 (McPDM, DMIC DT).
I have sent the patches needed for the dtsi files to probe the audio related
IPs with this patch.
Tested-by: Peter Ujfalusi <peter.ujfalusi@...com>
>
> Why RFC?
> Still we have function duplication omap_device_fill_resources() and
> omap_device_fill_dma_resources(), we can actually split the function
> into 3 resources and avoid duplication -
> - omap_device_fill_dma_resources()
> - omap_device_fill_mem_resources()
> - omap_device_fill_irq_resources()
>
> Actually I wanted to clean it further but thought of getting
> feedback first and then proceed further.
>
> arch/arm/mach-omap2/omap_hwmod.c | 27 ++++++++++
> arch/arm/plat-omap/include/plat/omap_hwmod.h | 1 +
> arch/arm/plat-omap/omap_device.c | 72 +++++++++++++++++++++----
> 3 files changed, 88 insertions(+), 12 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
> index 31ec283..edabfb3 100644
> --- a/arch/arm/mach-omap2/omap_hwmod.c
> +++ b/arch/arm/mach-omap2/omap_hwmod.c
> @@ -3330,6 +3330,33 @@ int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res)
> }
>
> /**
> + * omap_hwmod_fill_dma_resources - fill struct resource array with dma data
> + * @oh: struct omap_hwmod *
> + * @res: pointer to the array of struct resource to fill
> + *
> + * Fill the struct resource array @res with dma resource data from the
> + * omap_hwmod @oh. Intended to be called by code that registers
> + * omap_devices. See also omap_hwmod_count_resources(). Returns the
> + * number of array elements filled.
> + */
> +int omap_hwmod_fill_dma_resources(struct omap_hwmod *oh, struct resource *res)
> +{
> + int i, sdma_reqs_cnt;
> + int r = 0;
> +
> + sdma_reqs_cnt = _count_sdma_reqs(oh);
> + for (i = 0; i < sdma_reqs_cnt; i++) {
> + (res + r)->name = (oh->sdma_reqs + i)->name;
> + (res + r)->start = (oh->sdma_reqs + i)->dma_req;
> + (res + r)->end = (oh->sdma_reqs + i)->dma_req;
> + (res + r)->flags = IORESOURCE_DMA;
> + r++;
> + }
> +
> + return r;
> +}
> +
> +/**
> * omap_hwmod_get_resource_byname - fetch IP block integration data by name
> * @oh: struct omap_hwmod * to operate on
> * @type: one of the IORESOURCE_* constants from include/linux/ioport.h
> diff --git a/arch/arm/plat-omap/include/plat/omap_hwmod.h b/arch/arm/plat-omap/include/plat/omap_hwmod.h
> index 9b9646c..0533073 100644
> --- a/arch/arm/plat-omap/include/plat/omap_hwmod.h
> +++ b/arch/arm/plat-omap/include/plat/omap_hwmod.h
> @@ -615,6 +615,7 @@ int omap_hwmod_softreset(struct omap_hwmod *oh);
>
> int omap_hwmod_count_resources(struct omap_hwmod *oh);
> int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res);
> +int omap_hwmod_fill_dma_resources(struct omap_hwmod *oh, struct resource *res);
> int omap_hwmod_get_resource_byname(struct omap_hwmod *oh, unsigned int type,
> const char *name, struct resource *res);
>
> diff --git a/arch/arm/plat-omap/omap_device.c b/arch/arm/plat-omap/omap_device.c
> index c490240..fd15a3a 100644
> --- a/arch/arm/plat-omap/omap_device.c
> +++ b/arch/arm/plat-omap/omap_device.c
> @@ -486,6 +486,33 @@ static int omap_device_fill_resources(struct omap_device *od,
> }
>
> /**
> + * omap_device_fill_dma_resources - fill in array of struct resource with dma resources
> + * @od: struct omap_device *
> + * @res: pointer to an array of struct resource to be filled in
> + *
> + * Populate one or more empty struct resource pointed to by @res with
> + * the dma resource data for this omap_device @od. Used by
> + * omap_device_alloc() after calling omap_device_count_resources().
> + *
> + * Ideally this function would not be needed at all. If we have
> + * mechanism to get dma resources from DT.
> + *
> + * Returns 0.
> + */
> +static int omap_device_fill_dma_resources(struct omap_device *od,
> + struct resource *res)
> +{
> + int i, r;
> +
> + for (i = 0; i < od->hwmods_cnt; i++) {
> + r = omap_hwmod_fill_dma_resources(od->hwmods[i], res);
> + res += r;
> + }
> +
> + return 0;
> +}
> +
> +/**
> * omap_device_alloc - allocate an omap_device
> * @pdev: platform_device that will be included in this omap_device
> * @oh: ptr to the single omap_hwmod that backs this omap_device
> @@ -524,24 +551,45 @@ struct omap_device *omap_device_alloc(struct platform_device *pdev,
> od->hwmods = hwmods;
> od->pdev = pdev;
>
> + res_count = omap_device_count_resources(od);
> /*
> - * HACK: Ideally the resources from DT should match, and hwmod
> - * should just add the missing ones. Since the name is not
> - * properly populated by DT, stick to hwmod resources only.
> + * DT Boot:
> + * OF framework will construct the resource structure (currently
> + * does for MEM & IRQ resource) and we should respect/use these
> + * resources, killing hwmod dependency.
> + * If pdev->num_resources > 0, we assume that MEM & IRQ resources
> + * have been allocated by OF layer already (through DTB).
> + *
> + * Non-DT Boot:
> + * Here, pdev->num_resources = 0, and we should get all the
> + * resources from hwmod.
> + *
> + * TODO: Once DMA resource is available from OF layer, we should
> + * kill filling any resources from hwmod.
> */
> - if (pdev->num_resources && pdev->resource)
> - dev_warn(&pdev->dev, "%s(): resources already allocated %d\n",
> - __func__, pdev->num_resources);
> -
> - res_count = omap_device_count_resources(od);
> - if (res_count > 0) {
> - dev_dbg(&pdev->dev, "%s(): resources allocated from hwmod %d\n",
> - __func__, res_count);
> + if (res_count > pdev->num_resources) {
> + /* Allocate resources memory to account for new resources */
> res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL);
> if (!res)
> goto oda_exit3;
>
> - omap_device_fill_resources(od, res);
> + /*
> + * If pdev->num_resources > 0, then assume that,
> + * MEM and IRQ resources will only come from DT and only
> + * fill DMA resource from hwmod layer.
> + */
> + if (pdev->num_resources && pdev->resource) {
> + dev_dbg(&pdev->dev, "%s(): resources already allocated %d\n",
> + __func__, res_count);
> + memcpy(res, pdev->resource,
> + sizeof(struct resource) * pdev->num_resources);
> + omap_device_fill_dma_resources(od,
> + &res[pdev->num_resources]);
> + } else {
> + dev_dbg(&pdev->dev, "%s(): using resources from hwmod %d\n",
> + __func__, res_count);
> + omap_device_fill_resources(od, res);
> + }
>
> ret = platform_device_add_resources(pdev, res, res_count);
> kfree(res);
> --
> 1.7.0.4
>
> --
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