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Message-ID: <79CD15C6BA57404B839C016229A409A83EAAE645@DBDE01.ent.ti.com>
Date: Fri, 7 Sep 2012 18:44:17 +0000
From: "Hiremath, Vaibhav" <hvaibhav@...com>
To: "Cousson, Benoit" <b-cousson@...com>
CC: "linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"devicetree-discuss@...ts.ozlabs.org"
<devicetree-discuss@...ts.ozlabs.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Tony Lindgren <tony@...mide.com>,
Paul Walmsley <paul@...an.com>,
"Hilman, Kevin" <khilman@...com>
Subject: RE: [RFC PATCH] ARM: OMAP2+: omap-device: Do not overwrite
resources allocated by OF layer
On Fri, Sep 07, 2012 at 23:17:37, Cousson, Benoit wrote:
> Hi Vaibhav,
>
> The following patch is hacing some checkpatch issues.
>
> CHECK: Alignment should match open parenthesis
> #169: FILE: arch/arm/plat-omap/omap_device.c:591:
> + dev_dbg(&pdev->dev, "%s(): resources already allocated %d\n",
> + __func__, res_count);
>
> CHECK: Alignment should match open parenthesis
> #171: FILE: arch/arm/plat-omap/omap_device.c:593:
> + memcpy(res, pdev->resource,
> + sizeof(struct resource) * pdev->num_resources);
>
> CHECK: Alignment should match open parenthesis
> #173: FILE: arch/arm/plat-omap/omap_device.c:595:
> + omap_device_fill_dma_resources(od,
> + &res[pdev->num_resources]);
>
> CHECK: Alignment should match open parenthesis
> #176: FILE: arch/arm/plat-omap/omap_device.c:598:
> + dev_dbg(&pdev->dev, "%s(): using resources from hwmod %d\n",
> + __func__, res_count);
>
> total: 0 errors, 0 warnings, 4 checks, 130 lines checked
>
>
> Since I was in a nice mood, because the week-end is almost there, I fixed them myself.
>
My bad...I usually do check for checkpatch.pl and sparse warnings, not sure
how did I miss this one. I will be more careful here onwards.
> Please note that I had to rename the API becasue it was way too long to do a proper alignement.
>
> omap_device_fill_dma_resources -> _od_fill_dma_resources
>
> In fact I realized that some private APIs should probably be renamed as well like that for
> consistency.
>
> Just let me know if you have any issue with that version.
>
Looks ok to me.
Thanks,
Vaibhav
> Regards,
> Benoit
>
> ---
> From b82b04e8eb27abe0cfe9cd7bf4fee8bb1bb9b013 Mon Sep 17 00:00:00 2001
> From: Vaibhav Hiremath <hvaibhav@...com>
> Date: Wed, 29 Aug 2012 15:18:11 +0530
> Subject: [PATCH] ARM: OMAP: omap_device: Do not overwrite resources allocated by OF layer
>
> 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: Tony Lindgren <tony@...mide.com>
> Cc: Paul Walmsley <paul@...an.com>
> Cc: Kevin Hilman <khilman@...com>
> [b-cousson@...com: Fix some checkpatch CHECK issues]
> Signed-off-by: Benoit Cousson <b-cousson@...com>
> ---
> 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 | 71 +++++++++++++++++++++----
> 3 files changed, 87 insertions(+), 12 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
> index 6ca8e51..7768804 100644
> --- a/arch/arm/mach-omap2/omap_hwmod.c
> +++ b/arch/arm/mach-omap2/omap_hwmod.c
> @@ -3158,6 +3158,33 @@ 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 6132972..5857b9c 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 ff57b5a..6f5c580 100644
> --- a/arch/arm/plat-omap/omap_device.c
> +++ b/arch/arm/plat-omap/omap_device.c
> @@ -494,6 +494,33 @@ static int omap_device_fill_resources(struct omap_device *od,
> }
>
> /**
> + * _od_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 _od_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
> @@ -532,24 +559,44 @@ 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);
> + _od_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
>
>
>
> On 08/29/2012 11:48 AM, 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.
> >
> > 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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