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Date: Tue, 22 Feb 2011 17:08:26 +0530
From: "TK, Pratheesh Gangadhar" <pratheesh@...com>
To: Sergei Shtylyov <sshtylyov@...sta.com>
CC: "davinci-linux-open-source@...ux.davincidsp.com"
<davinci-linux-open-source@...ux.davincidsp.com>,
"gregkh@...e.de" <gregkh@...e.de>,
"Chatterjee, Amit" <amit.chatterjee@...com>,
"hjk@...utronix.de" <hjk@...utronix.de>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH 2/2] Defines DA850/AM18xx/OMAPL1-38 SOC resources used
by PRUSS UIO driver
Hi,
> -----Original Message-----
> From: Sergei Shtylyov [mailto:sshtylyov@...sta.com]
> Sent: Monday, February 21, 2011 10:40 PM
> To: TK, Pratheesh Gangadhar
> Cc: davinci-linux-open-source@...ux.davincidsp.com; gregkh@...e.de;
> Chatterjee, Amit; hjk@...utronix.de; linux-kernel@...r.kernel.org; linux-
> arm-kernel@...ts.infradead.org
> Subject: Re: [PATCH 2/2] Defines DA850/AM18xx/OMAPL1-38 SOC resources used
> by PRUSS UIO driver
>
> Hello.
>
> Pratheesh Gangadhar wrote:
>
> > Signed-off-by: Pratheesh Gangadhar <pratheesh@...com>
>
> Signoff should follow the change log, not precede it. "From:" line may
> precede the change log.
Fixed this in the new version.
>
> > This patch defines PRUSS, ECAP clocks, memory and IRQ resources
> > used by PRUSS UIO driver in DA850/AM18xx/OMAPL1-38 devices. UIO
> > driver exports 64K I/O region of PRUSS, 128KB L3 RAM and 256KB
> > DDR buffer to user space. PRUSS has 8 host event interrupt lines
> > mapped to IRQ_DA8XX_EVTOUT0..7 of ARM9 INTC.These in conjunction
> > with shared memory can be used to implement IPC between ARM9 and
> > PRUSS.
>
> > diff --git a/arch/arm/mach-davinci/board-da850-evm.c b/arch/arm/mach-
> davinci/board-da850-evm.c
> > index 11f986b..ddcbac8 100644
> > --- a/arch/arm/mach-davinci/board-da850-evm.c
> > +++ b/arch/arm/mach-davinci/board-da850-evm.c
> > @@ -1077,6 +1077,10 @@ static __init void da850_evm_init(void)
> > pr_warning("da850_evm_init: i2c0 registration failed: %d\n",
> > ret);
> >
> > + ret = da8xx_register_pruss();
> > + if (ret)
> > + pr_warning("da850_evm_init: pruss registration failed:
> %d\n",
> > + ret);
> >
> > ret = da8xx_register_watchdog();
> > if (ret)
>
> I'd put this into a pacth of its own, to have the SoC level changes
> separated from board-level changes...
Ok. I will do this; I need to make this change for hawkboard as well.
>
> > diff --git a/arch/arm/mach-davinci/da850.c b/arch/arm/mach-
> davinci/da850.c
> > index 3443d97..0096d4f 100644
> > --- a/arch/arm/mach-davinci/da850.c
> > +++ b/arch/arm/mach-davinci/da850.c
> > @@ -238,6 +238,13 @@ static struct clk tptc2_clk = {
> > .flags = ALWAYS_ENABLED,
> > };
> >
> > +static struct clk pruss_clk = {
> > + .name = "pruss",
> > + .parent = &pll0_sysclk2,
> > + .lpsc = DA8XX_LPSC0_DMAX,
>
> We have patch submitted by TI that renames this #define to
> DA8XX_LPSC0_PRUSS...
>
> > + .flags = ALWAYS_ENABLED,
> > +};
> > +
>
> We already have patch submitted by TI that defines this clock. It
> would be
> nice if you coordinated your efforts to avoid such conflicts.
> Again, I'd put the part adding the clocks into a patch of its own.
I will try to sync with that patch.
>
> > diff --git a/arch/arm/mach-davinci/devices-da8xx.c b/arch/arm/mach-
> davinci/devices-da8xx.c
> > index beda8a4..4ea3d1f 100644
> > --- a/arch/arm/mach-davinci/devices-da8xx.c
> > +++ b/arch/arm/mach-davinci/devices-da8xx.c
> > @@ -725,3 +725,76 @@ int __init da8xx_register_cpuidle(void)
> >
> > return platform_device_register(&da8xx_cpuidle_device);
> > }
> > +static struct resource pruss_resources[] = {
> > + [0] = {
> > + .start = DA8XX_PRUSS_BASE,
> > + .end = DA8XX_PRUSS_BASE + SZ_64K - 1,
> > + .flags = IORESOURCE_MEM,
> > + },
> > + [1] = {
> > + .start = DA8XX_L3RAM_BASE,
> > + .end = DA8XX_L3RAM_BASE + SZ_128K - 1,
> > + .flags = IORESOURCE_MEM,
>
> Are you going to use all SRAM?
Its application dependent - we don't use more than 10KB at this point.
>
> > + },
> > + [2] = {
> > + .start = 0,
> > + .end = SZ_256K - 1,
> > + .flags = IORESOURCE_MEM,
> > + },
> > +
> > + [3] = {
> > + .start = IRQ_DA8XX_EVTOUT0,
> > + .end = IRQ_DA8XX_EVTOUT0,
> > + .flags = IORESOURCE_IRQ,
> > + },
> > + [4] = {
> > + .start = IRQ_DA8XX_EVTOUT1,
> > + .end = IRQ_DA8XX_EVTOUT1,
> > + .flags = IORESOURCE_IRQ,
> > + },
> > + [5] = {
> > + .start = IRQ_DA8XX_EVTOUT2,
> > + .end = IRQ_DA8XX_EVTOUT2,
> > + .flags = IORESOURCE_IRQ,
> > + },
> > + [6] = {
> > + .start = IRQ_DA8XX_EVTOUT3,
> > + .end = IRQ_DA8XX_EVTOUT3,
> > + .flags = IORESOURCE_IRQ,
> > + },
> > + [7] = {
> > + .start = IRQ_DA8XX_EVTOUT4,
> > + .end = IRQ_DA8XX_EVTOUT4,
> > + .flags = IORESOURCE_IRQ,
> > + },
> > + [8] = {
> > + .start = IRQ_DA8XX_EVTOUT5,
> > + .end = IRQ_DA8XX_EVTOUT5,
> > + .flags = IORESOURCE_IRQ,
> > + },
> > + [9] = {
> > + .start = IRQ_DA8XX_EVTOUT6,
> > + .end = IRQ_DA8XX_EVTOUT6,
> > + .flags = IORESOURCE_IRQ,
> > + },
> > + [10] = {
> > + .start = IRQ_DA8XX_EVTOUT7,
> > + .end = IRQ_DA8XX_EVTOUT7,
> > + .flags = IORESOURCE_IRQ,
> > + },
> > +};
> > +
> > +static struct platform_device pruss_device = {
> > + .name = "pruss",
> > + .id = 0,
> > + .num_resources = ARRAY_SIZE(pruss_resources),
> > + .resource = pruss_resources,
> > + .dev = {
> > + .coherent_dma_mask = 0xffffffff,
> > + }
> > +};
> > +
> > +int __init da8xx_register_pruss()
> > +{
> > + return platform_device_register(&pruss_device);
> > +}
>
> Again, there's TI patch that adds this device already...
I will check this.
Thanks,
Pratheesh
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