Patchwork [v2,2/2] RX-51: ARM errata 430973 workaround

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Submitter Pali Rohár
Date July 10, 2013, 12:59 p.m.
Message ID <1373461145-9812-3-git-send-email-pali.rohar@gmail.com>
Download mbox | patch
Permalink /patch/258044/
State New
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Comments

Pali Rohár - July 10, 2013, 12:59 p.m.
Closed and signed Nokia X-Loader bootloader stored in RX-51 nand does not set
IBE bit in ACTLR and starting kernel in non-secure mode. So direct write to
ACTLR by our kernel does not working and the code for ARM errata 430973 in
commit 7ce236fcd6fd45b0441a2d49acb2ceb2de2e8a47 that sets IBE bit is a noop.

In order to have workaround for ARM errata 430973 from non-secure world on
RX-51 we needs Secure Monitor Call to set IBE BIT in ACTLR.

This patch adds RX-51 specific SMC support and sets IBE bit in ACTLR during
board init code for ARM errata 430973 workaround.

ARM errata 430973 workaround is needed for thumb-2 ISA compiled userspace
binaries. Without this workaround thumb-2 binaries crashing. So with this
patch it is possible to recompile and run applications/binaries with thumb-2
ISA on RX-51.

Signed-off-by: Ivaylo Dimitrov <freemangordon@abv.bg>
Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
---
 arch/arm/mach-omap2/board-rx51.c |   78 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
Tony Lindgren - Sept. 17, 2013, 11:24 p.m.
* Pali Rohár <pali.rohar@gmail.com> [130710 06:06]:
> --- a/arch/arm/mach-omap2/board-rx51.c
> +++ b/arch/arm/mach-omap2/board-rx51.c

This file will be gone as soon as we're moving to device
tree based booting. So let's do this in more future proof
way.

> +/**
> + * rx51_secure_dispatcher: Routine to dispatch secure PPA API calls
> + * @idx: The PPA API index
> + * @process: Process ID
> + * @flag: The flag indicating criticality of operation
> + * @nargs: Number of valid arguments out of four.
> + * @arg1, arg2, arg3 args4: Parameters passed to secure API
> + *
> + * Return the non-zero error value on failure.
> + */
> +static u32 rx51_secure_dispatcher(u32 idx, u32 process, u32 flag, u32 nargs,
> +			   u32 arg1, u32 arg2, u32 arg3, u32 arg4)
> +{
> +	u32 ret;
> +	u32 param[5];
> +
> +	param[0] = nargs+1; /* RX-51 needs number of arguments + 1 */
> +	param[1] = arg1;
> +	param[2] = arg2;
> +	param[3] = arg3;
> +	param[4] = arg4;
> +
> +	/*
> +	 * Secure API needs physical address
> +	 * pointer for the parameters
> +	 */
> +	local_irq_disable();
> +	local_fiq_disable();
> +	flush_cache_all();
> +	outer_clean_range(__pa(param), __pa(param + 5));
> +	ret = omap_smc3(idx, process, flag, __pa(param));
> +	flush_cache_all();
> +	local_fiq_enable();
> +	local_irq_enable();
> +
> +	return ret;
> +}

I think this used to be in omap-secure.c, and then made rx51
specific.. But since board-rx51.c is going away, let's move
this function to omap-secure.c.

> + * rx51_secure_update_aux_cr: Routine to modify the contents of Auxiliary Control Register
> + *  @set_bits: bits to set in ACR
> + *  @clr_bits: bits to clear in ACR
> + *
> + * Return the non-zero error value on failure.
> +*/
> +static u32 rx51_secure_update_aux_cr(u32 set_bits, u32 clear_bits)
> +{
> +	u32 acr;
> +
> +	/* Read ACR */
> +	asm volatile ("mrc p15, 0, %0, c1, c0, 1" : "=r" (acr));
> +	acr &= ~clear_bits;
> +	acr |= set_bits;
> +
> +	return rx51_secure_dispatcher(RX51_PPA_WRITE_ACR,
> +				      0,
> +				      FLAG_START_CRITICAL,
> +				      1, acr, 0, 0, 0);
> +}

This too.

>  static void __init rx51_init(void)
>  {
>  	struct omap_sdrc_params *sdrc_params;
> @@ -105,6 +175,14 @@ static void __init rx51_init(void)
>  	rx51_peripherals_init();
>  	rx51_camera_init();
>  
> +	if (omap_type() == OMAP2_DEVICE_TYPE_SEC) {
> +#ifdef CONFIG_ARM_ERRATA_430973
> +		pr_info("RX-51: Enabling ARM errata 430973 workaround\n");
> +		/* set IBE to 1 */
> +		rx51_secure_update_aux_cr(BIT(6), 0);
> +#endif
> +	}
> +
>  	/* Ensure SDRC pins are mux'd for self-refresh */
>  	omap_mux_init_signal("sdrc_cke0", OMAP_PIN_OUTPUT);
>  	omap_mux_init_signal("sdrc_cke1", OMAP_PIN_OUTPUT);

Then this can be called both from board-generic.c based on the
compatible flag, and board-rx51.c for now.

Regards,

Tony
Pali Rohár - Sept. 18, 2013, 8:33 a.m.
On Wednesday 18 September 2013 01:24:17 Tony Lindgren wrote:
> * Pali Rohár <pali.rohar@gmail.com> [130710 06:06]:
> > --- a/arch/arm/mach-omap2/board-rx51.c
> > +++ b/arch/arm/mach-omap2/board-rx51.c
> 
> This file will be gone as soon as we're moving to device
> tree based booting. So let's do this in more future proof
> way.
> 
> > +/**
> > + * rx51_secure_dispatcher: Routine to dispatch secure PPA
> > API calls + * @idx: The PPA API index
> > + * @process: Process ID
> > + * @flag: The flag indicating criticality of operation
> > + * @nargs: Number of valid arguments out of four.
> > + * @arg1, arg2, arg3 args4: Parameters passed to secure API
> > + *
> > + * Return the non-zero error value on failure.
> > + */
> > +static u32 rx51_secure_dispatcher(u32 idx, u32 process, u32
> > flag, u32 nargs, +			   u32 arg1, u32 arg2, u32 arg3, u32
> > arg4)
> > +{
> > +	u32 ret;
> > +	u32 param[5];
> > +
> > +	param[0] = nargs+1; /* RX-51 needs number of arguments + 
1
> > */ +	param[1] = arg1;
> > +	param[2] = arg2;
> > +	param[3] = arg3;
> > +	param[4] = arg4;
> > +
> > +	/*
> > +	 * Secure API needs physical address
> > +	 * pointer for the parameters
> > +	 */
> > +	local_irq_disable();
> > +	local_fiq_disable();
> > +	flush_cache_all();
> > +	outer_clean_range(__pa(param), __pa(param + 5));
> > +	ret = omap_smc3(idx, process, flag, __pa(param));
> > +	flush_cache_all();
> > +	local_fiq_enable();
> > +	local_irq_enable();
> > +
> > +	return ret;
> > +}
> 
> I think this used to be in omap-secure.c, and then made rx51
> specific.. But since board-rx51.c is going away, let's move
> this function to omap-secure.c.
> 
> > + * rx51_secure_update_aux_cr: Routine to modify the
> > contents of Auxiliary Control Register + *  @set_bits: bits
> > to set in ACR
> > + *  @clr_bits: bits to clear in ACR
> > + *
> > + * Return the non-zero error value on failure.
> > +*/
> > +static u32 rx51_secure_update_aux_cr(u32 set_bits, u32
> > clear_bits) +{
> > +	u32 acr;
> > +
> > +	/* Read ACR */
> > +	asm volatile ("mrc p15, 0, %0, c1, c0, 1" : "=r" (acr));
> > +	acr &= ~clear_bits;
> > +	acr |= set_bits;
> > +
> > +	return rx51_secure_dispatcher(RX51_PPA_WRITE_ACR,
> > +				      0,
> > +				      FLAG_START_CRITICAL,
> > +				      1, acr, 0, 0, 0);
> > +}
> 
> This too.
> 
> >  static void __init rx51_init(void)
> >  {
> >  
> >  	struct omap_sdrc_params *sdrc_params;
> > 
> > @@ -105,6 +175,14 @@ static void __init rx51_init(void)
> > 
> >  	rx51_peripherals_init();
> >  	rx51_camera_init();
> > 
> > +	if (omap_type() == OMAP2_DEVICE_TYPE_SEC) {
> > +#ifdef CONFIG_ARM_ERRATA_430973
> > +		pr_info("RX-51: Enabling ARM errata 430973
> > workaround\n"); +		/* set IBE to 1 */
> > +		rx51_secure_update_aux_cr(BIT(6), 0);
> > +#endif
> > +	}
> > +
> > 
> >  	/* Ensure SDRC pins are mux'd for self-refresh */
> >  	omap_mux_init_signal("sdrc_cke0", OMAP_PIN_OUTPUT);
> >  	omap_mux_init_signal("sdrc_cke1", OMAP_PIN_OUTPUT);
> 
> Then this can be called both from board-generic.c based on the
> compatible flag, and board-rx51.c for now.
> 
> Regards,
> 
> Tony

Hi Tony,

I'm not very happy. I sent this patch 6 months ago and only now 
you commented that needs rework again. This patch is needed 
because all thumb-2 userspace binaries crashing. I want to have
working support for Nokia N900 and not always rebasing and 
changing patches. Also DT still not working on N900 (file contains 
only small subset of devices as in board files plus it is not in 
stable kernel) so I do not want to switch to DT. I need something 
which is working and not something new non-working. I belive that 
you and other kernel guys do not remove all n900 board files until 
every one line will be rewritten to DT and tested that everything 
working. And from this and other conversation it looks for me 
that you are going to do that. So please clarify what you want to 
do (and when) with board-rx51-* files. Aftethat I can decide what 
to do in future.

For now I see this situation something like: I wrote patches, 
send them to ML and after half of year maintainer politely 
rejected them becuase my patches not using new uber cool 
technology with still not working and also was not available half 
year ago. What happen if I find another time to rework this patch 
and send it again in next 2 or 5 months?

Tony, if you did not have time for review this patch months ago 
or you found it only today - no problem, I understand it. But 
what I need to know is what will happen with board-rx51-* files 
(and when?) You can see that DT does not have definitions of all 
n900 hw parts (plus it is not in last 3.11 kernel!) which means 
that DT is not usable for me and other n900 people. This also 
means that I cannot rewrite my patches for DT and test if they 
working.
Tony Lindgren - Sept. 18, 2013, 5:18 p.m.
* Pali Rohár <pali.rohar@gmail.com> [130918 01:41]:
> 
> I'm not very happy. I sent this patch 6 months ago and only now 
> you commented that needs rework again. This patch is needed 
> because all thumb-2 userspace binaries crashing. I want to have
> working support for Nokia N900 and not always rebasing and 
> changing patches. Also DT still not working on N900 (file contains 
> only small subset of devices as in board files plus it is not in 
> stable kernel) so I do not want to switch to DT. I need something 
> which is working and not something new non-working. I belive that 
> you and other kernel guys do not remove all n900 board files until 
> every one line will be rewritten to DT and tested that everything 
> working. And from this and other conversation it looks for me 
> that you are going to do that. So please clarify what you want to 
> do (and when) with board-rx51-* files. Aftethat I can decide what 
> to do in future.

Sorry if there's been some going back and forth with the patches,
I think pretty much everybody wants n900 support in the mainline.

It's obvious that we're moving everything to be devicetree only
as discussed on the mailing lists over past few years. For most
drivers it's already working, and we can still initialize platform
data too for the legacy devices until they have bindings, so it
should not be too intrusive except for the configuration changes
to use appended DTB or a chained bootloader with DTB support.

> For now I see this situation something like: I wrote patches, 
> send them to ML and after half of year maintainer politely 
> rejected them becuase my patches not using new uber cool 
> technology with still not working and also was not available half 
> year ago. What happen if I find another time to rework this patch 
> and send it again in next 2 or 5 months?

Hmm hasn't there been pending comments until recently on your
patches?

It seems that with the changes I suggested your patches should
work for both legacy booting and DT based booting, so maybe just
try to update them over next few weeks, let's say by -rc3 rather
than wait 2 to 5 months? :) No need to test them currently on
the DT based booting if you don't have that set up, just move
the code out of the board-*.c file.
 
> Tony, if you did not have time for review this patch months ago 
> or you found it only today - no problem, I understand it. But 
> what I need to know is what will happen with board-rx51-* files 
> (and when?) You can see that DT does not have definitions of all 
> n900 hw parts (plus it is not in last 3.11 kernel!) which means 
> that DT is not usable for me and other n900 people. This also 
> means that I cannot rewrite my patches for DT and test if they 
> working.

I usually stop looking at new code around -rc4 and concentrate
on fixes until -rc1 or so. So there can be easily one month
delays on reviewing stuff depending on where we are with the
current merge window or -rc cycle, sorry if that's annoying.

The .dts files will be separate from the kernel soonish, so
that's not be a show stopper. Just like all the board specific
.config files are separate from the kernel already. Too bad our
.dts changes did not get merged for v3.12 because of conflicts
with other branches, but hey, they should be independent from the
kernel anyways.

The board files will be going away as soon as things are working
with DT. We've been pretty much only applying fixes to them for
quite some time now. For the timeline, the earliest we'll be able
to remove the board-*.c files and platform data is for v3.13
assuming the PM dependencies get sorted out before that. Making
omap3 DT only is going remove about 25k LOC, so that's a good
reason for doing that.

Cheers,

Tony
Pali Rohár - Sept. 18, 2013, 6:13 p.m.
Hello,

On Wednesday 18 September 2013 19:18:17 Tony Lindgren wrote:
> * Pali Rohár <pali.rohar@gmail.com> [130918 01:41]:
> > I'm not very happy. I sent this patch 6 months ago and only
> > now you commented that needs rework again. This patch is
> > needed because all thumb-2 userspace binaries crashing. I
> > want to have working support for Nokia N900 and not always
> > rebasing and changing patches. Also DT still not working on
> > N900 (file contains only small subset of devices as in
> > board files plus it is not in stable kernel) so I do not
> > want to switch to DT. I need something which is working and
> > not something new non-working. I belive that you and other
> > kernel guys do not remove all n900 board files until every
> > one line will be rewritten to DT and tested that everything
> > working. And from this and other conversation it looks for
> > me that you are going to do that. So please clarify what
> > you want to do (and when) with board-rx51-* files. Aftethat
> > I can decide what to do in future.
> 
> Sorry if there's been some going back and forth with the
> patches, I think pretty much everybody wants n900 support in
> the mainline.
> 
> It's obvious that we're moving everything to be devicetree
> only as discussed on the mailing lists over past few years.
> For most drivers it's already working, and we can still
> initialize platform data too for the legacy devices until
> they have bindings, so it should not be too intrusive except
> for the configuration changes to use appended DTB or a
> chained bootloader with DTB support.
> 
> > For now I see this situation something like: I wrote
> > patches, send them to ML and after half of year maintainer
> > politely rejected them becuase my patches not using new
> > uber cool technology with still not working and also was
> > not available half year ago. What happen if I find another
> > time to rework this patch and send it again in next 2 or 5
> > months?
> 
> Hmm hasn't there been pending comments until recently on your
> patches?
> 

Since 10.07.2013 I do not have any emails for patch 2/2. If I 
missed something from you, please resend me it.

> It seems that with the changes I suggested your patches should
> work for both legacy booting and DT based booting, so maybe
> just try to update them over next few weeks, let's say by
> -rc3 rather than wait 2 to 5 months? :) No need to test them
> currently on the DT based booting if you don't have that set
> up, just move the code out of the board-*.c file.
> 

Ok, no problem. I will move code as you suggested.

> > Tony, if you did not have time for review this patch months
> > ago or you found it only today - no problem, I understand
> > it. But what I need to know is what will happen with
> > board-rx51-* files (and when?) You can see that DT does not
> > have definitions of all n900 hw parts (plus it is not in
> > last 3.11 kernel!) which means that DT is not usable for me
> > and other n900 people. This also means that I cannot
> > rewrite my patches for DT and test if they working.
> 
> I usually stop looking at new code around -rc4 and concentrate
> on fixes until -rc1 or so. So there can be easily one month
> delays on reviewing stuff depending on where we are with the
> current merge window or -rc cycle, sorry if that's annoying.
> 
> The .dts files will be separate from the kernel soonish, so
> that's not be a show stopper. Just like all the board specific
> .config files are separate from the kernel already. Too bad
> our .dts changes did not get merged for v3.12 because of
> conflicts with other branches, but hey, they should be
> independent from the kernel anyways.
> 
> The board files will be going away as soon as things are
> working with DT. We've been pretty much only applying fixes
> to them for quite some time now. For the timeline, the
> earliest we'll be able to remove the board-*.c files and
> platform data is for v3.13 assuming the PM dependencies get
> sorted out before that. Making omap3 DT only is going remove
> about 25k LOC, so that's a good reason for doing that.
> 
> Cheers,
> 
> Tony

Thanks for clarification.
Tony Lindgren - Sept. 18, 2013, 6:21 p.m.
* Pali Rohár <pali.rohar@gmail.com> [130918 11:21]:
> On Wednesday 18 September 2013 19:18:17 Tony Lindgren wrote:
> > 
> > Hmm hasn't there been pending comments until recently on your
> > patches?
> > 
> 
> Since 10.07.2013 I do not have any emails for patch 2/2. If I 
> missed something from you, please resend me it.

Sorry I noticed it only when looking at them again from "keep
in my inbox for applying" or "mark as read and archive" point
of view. So no other comments from me are pending.
 
> > It seems that with the changes I suggested your patches should
> > work for both legacy booting and DT based booting, so maybe
> > just try to update them over next few weeks, let's say by
> > -rc3 rather than wait 2 to 5 months? :) No need to test them
> > currently on the DT based booting if you don't have that set
> > up, just move the code out of the board-*.c file.
> > 
> 
> Ok, no problem. I will move code as you suggested.

Thanks,

Tony
Tony Lindgren - Sept. 18, 2013, 7:27 p.m.
* Pali Rohár <pali.rohar@gmail.com> [130918 12:29]:
> Hello Tony,
> 
> here is new v3 patch. I just only moved functions rx51_secure_dispatcher and
> rx51_secure_update_aux_cr to omap-secure.c and added header to omap-secure.h
> Because I only moved two functions to other source file I tested only compilation.
> It is OK now?

Yes looks OK to me for v3.13 for the patch.

For the patch description, maybe also add something saying
that the rx51_secure_dispatcher() is different from the existing
smc function as that may be easy to miss while glancing over
the code?

Regards,

Tony
 
> diff --git a/arch/arm/mach-omap2/board-rx51.c b/arch/arm/mach-omap2/board-rx51.c
> index 773510556..db168c9 100644
> --- a/arch/arm/mach-omap2/board-rx51.c
> +++ b/arch/arm/mach-omap2/board-rx51.c
> @@ -2,6 +2,8 @@
>   * Board support file for Nokia N900 (aka RX-51).
>   *
>   * Copyright (C) 2007, 2008 Nokia
> + * Copyright (C) 2012 Ivaylo Dimitrov <freemangordon@abv.bg>
> + * Copyright (C) 2013 Pali Rohár <pali.rohar@gmail.com>
>   *
>   * This program is free software; you can redistribute it and/or modify
>   * it under the terms of the GNU General Public License version 2 as
> @@ -31,7 +33,9 @@
>  #include "mux.h"
>  #include "gpmc.h"
>  #include "pm.h"
> +#include "soc.h"
>  #include "sdram-nokia.h"
> +#include "omap-secure.h"
>  
>  #define RX51_GPIO_SLEEP_IND 162
>  
> @@ -103,6 +107,14 @@ static void __init rx51_init(void)
>  	usb_musb_init(&musb_board_data);
>  	rx51_peripherals_init();
>  
> +	if (omap_type() == OMAP2_DEVICE_TYPE_SEC) {
> +#ifdef CONFIG_ARM_ERRATA_430973
> +		pr_info("RX-51: Enabling ARM errata 430973 workaround\n");
> +		/* set IBE to 1 */
> +		rx51_secure_update_aux_cr(BIT(6), 0);
> +#endif
> +	}
> +
>  	/* Ensure SDRC pins are mux'd for self-refresh */
>  	omap_mux_init_signal("sdrc_cke0", OMAP_PIN_OUTPUT);
>  	omap_mux_init_signal("sdrc_cke1", OMAP_PIN_OUTPUT);
> diff --git a/arch/arm/mach-omap2/omap-secure.c b/arch/arm/mach-omap2/omap-secure.c
> index b970440..eba74cf 100644
> --- a/arch/arm/mach-omap2/omap-secure.c
> +++ b/arch/arm/mach-omap2/omap-secure.c
> @@ -3,6 +3,8 @@
>   *
>   * Copyright (C) 2011 Texas Instruments, Inc.
>   *	Santosh Shilimkar <santosh.shilimkar@ti.com>
> + * Copyright (C) 2012 Ivaylo Dimitrov <freemangordon@abv.bg>
> + * Copyright (C) 2013 Pali Rohár <pali.rohar@gmail.com>
>   *
>   *
>   * This program is free software,you can redistribute it and/or modify
> @@ -70,3 +72,63 @@ phys_addr_t omap_secure_ram_mempool_base(void)
>  {
>  	return omap_secure_memblock_base;
>  }
> +
> +/**
> + * rx51_secure_dispatcher: Routine to dispatch secure PPA API calls
> + * @idx: The PPA API index
> + * @process: Process ID
> + * @flag: The flag indicating criticality of operation
> + * @nargs: Number of valid arguments out of four.
> + * @arg1, arg2, arg3 args4: Parameters passed to secure API
> + *
> + * Return the non-zero error value on failure.
> + */
> +u32 rx51_secure_dispatcher(u32 idx, u32 process, u32 flag, u32 nargs,
> +			   u32 arg1, u32 arg2, u32 arg3, u32 arg4)
> +{
> +	u32 ret;
> +	u32 param[5];
> +
> +	param[0] = nargs+1; /* RX-51 needs number of arguments + 1 */
> +	param[1] = arg1;
> +	param[2] = arg2;
> +	param[3] = arg3;
> +	param[4] = arg4;
> +
> +	/*
> +	 * Secure API needs physical address
> +	 * pointer for the parameters
> +	 */
> +	local_irq_disable();
> +	local_fiq_disable();
> +	flush_cache_all();
> +	outer_clean_range(__pa(param), __pa(param + 5));
> +	ret = omap_smc3(idx, process, flag, __pa(param));
> +	flush_cache_all();
> +	local_fiq_enable();
> +	local_irq_enable();
> +
> +	return ret;
> +}
> +
> +/**
> + * rx51_secure_update_aux_cr: Routine to modify the contents of Auxiliary Control Register
> + *  @set_bits: bits to set in ACR
> + *  @clr_bits: bits to clear in ACR
> + *
> + * Return the non-zero error value on failure.
> +*/
> +u32 rx51_secure_update_aux_cr(u32 set_bits, u32 clear_bits)
> +{
> +	u32 acr;
> +
> +	/* Read ACR */
> +	asm volatile ("mrc p15, 0, %0, c1, c0, 1" : "=r" (acr));
> +	acr &= ~clear_bits;
> +	acr |= set_bits;
> +
> +	return rx51_secure_dispatcher(RX51_PPA_WRITE_ACR,
> +				      0,
> +				      FLAG_START_CRITICAL,
> +				      1, acr, 0, 0, 0);
> +}
> diff --git a/arch/arm/mach-omap2/omap-secure.h b/arch/arm/mach-omap2/omap-secure.h
> index c4586f4..51b59c6 100644
> --- a/arch/arm/mach-omap2/omap-secure.h
> +++ b/arch/arm/mach-omap2/omap-secure.h
> @@ -3,6 +3,8 @@
>   *
>   * Copyright (C) 2011 Texas Instruments, Inc.
>   *	Santosh Shilimkar <santosh.shilimkar@ti.com>
> + * Copyright (C) 2012 Ivaylo Dimitrov <freemangordon@abv.bg>
> + * Copyright (C) 2013 Pali Rohár <pali.rohar@gmail.com>
>   *
>   * This program is free software; you can redistribute it and/or modify
>   * it under the terms of the GNU General Public License version 2 as
> @@ -46,6 +48,11 @@
>  #define OMAP4_PPA_L2_POR_INDEX		0x23
>  #define OMAP4_PPA_CPU_ACTRL_SMP_INDEX	0x25
>  
> +/* Secure RX-51 PPA (Primary Protected Application) APIs */
> +#define RX51_PPA_HWRNG			29
> +#define RX51_PPA_L2_INVAL		40
> +#define RX51_PPA_WRITE_ACR		42
> +
>  #ifndef __ASSEMBLER__
>  
>  extern u32 omap_secure_dispatcher(u32 idx, u32 flag, u32 nargs,
> @@ -55,6 +62,10 @@ extern u32 omap_smc3(u32 id, u32 process, u32 flag, u32 pargs);
>  extern phys_addr_t omap_secure_ram_mempool_base(void);
>  extern int omap_secure_ram_reserve_memblock(void);
>  
> +extern u32 rx51_secure_dispatcher(u32 idx, u32 process, u32 flag, u32 nargs,
> +				  u32 arg1, u32 arg2, u32 arg3, u32 arg4);
> +extern u32 rx51_secure_update_aux_cr(u32 set_bits, u32 clear_bits);
> +
>  #ifdef CONFIG_OMAP4_ERRATA_I688
>  extern int omap_barrier_reserve_memblock(void);
>  #else
> 
> 
> -- 
> Pali Rohár
> pali.rohar@gmail.com
Pavel Machek - Sept. 24, 2013, 12:15 a.m.
Hi!

> > Tony, if you did not have time for review this patch months ago 
> > or you found it only today - no problem, I understand it. But 
> > what I need to know is what will happen with board-rx51-* files 
> > (and when?) You can see that DT does not have definitions of all 
> > n900 hw parts (plus it is not in last 3.11 kernel!) which means 
> > that DT is not usable for me and other n900 people. This also 
> > means that I cannot rewrite my patches for DT and test if they 
> > working.
> 
> I usually stop looking at new code around -rc4 and concentrate
> on fixes until -rc1 or so. So there can be easily one month
> delays on reviewing stuff depending on where we are with the
> current merge window or -rc cycle, sorry if that's annoying.
> 
> The .dts files will be separate from the kernel soonish, so
> that's not be a show stopper. Just like all the board specific
> .config files are separate from the kernel already. Too bad our
> .dts changes did not get merged for v3.12 because of conflicts
> with other branches, but hey, they should be independent from the
> kernel anyways.

Well... I'd say it is still time to merge them. "New hardware support"
is ok after -rc1.

> The board files will be going away as soon as things are working
> with DT. We've been pretty much only applying fixes to them for
> quite some time now. For the timeline, the earliest we'll be able
> to remove the board-*.c files and platform data is for v3.13

And it would be good to merge n900 dts support for 3.12. Adding 
device tree at the same release as removing board support files in
same release leaves zero room for testing, and practically guarantees
regressions.

									Pavel
Tony Lindgren - Sept. 24, 2013, 4:51 p.m.
* Pavel Machek <pavel@ucw.cz> [130923 17:23]:
> Hi!
> 
> > > Tony, if you did not have time for review this patch months ago 
> > > or you found it only today - no problem, I understand it. But 
> > > what I need to know is what will happen with board-rx51-* files 
> > > (and when?) You can see that DT does not have definitions of all 
> > > n900 hw parts (plus it is not in last 3.11 kernel!) which means 
> > > that DT is not usable for me and other n900 people. This also 
> > > means that I cannot rewrite my patches for DT and test if they 
> > > working.
> > 
> > I usually stop looking at new code around -rc4 and concentrate
> > on fixes until -rc1 or so. So there can be easily one month
> > delays on reviewing stuff depending on where we are with the
> > current merge window or -rc cycle, sorry if that's annoying.
> > 
> > The .dts files will be separate from the kernel soonish, so
> > that's not be a show stopper. Just like all the board specific
> > .config files are separate from the kernel already. Too bad our
> > .dts changes did not get merged for v3.12 because of conflicts
> > with other branches, but hey, they should be independent from the
> > kernel anyways.
> 
> Well... I'd say it is still time to merge them. "New hardware support"
> is ok after -rc1.

Sure if there's a good reason like "driver foo is already device
tree only and cannot be used for board bar without blah".
 
> > The board files will be going away as soon as things are working
> > with DT. We've been pretty much only applying fixes to them for
> > quite some time now. For the timeline, the earliest we'll be able
> > to remove the board-*.c files and platform data is for v3.13
> 
> And it would be good to merge n900 dts support for 3.12. Adding 
> device tree at the same release as removing board support files in
> same release leaves zero room for testing, and practically guarantees
> regressions.

Yes we experienced that with omap4 conversion where it caused
some wl12xx regression. So we might want to keep some omap3
board files around until v3.14 if necessary.

Also please take a look at the "[PATCH 0/4] Clean up legacy platform
data handling for omaps for v3.13" patches I posted few days ago,
those should make it easy to have board specific pdata quirks
for DT based booting.

Regards,

Tony

Patch

diff --git a/arch/arm/mach-omap2/board-rx51.c b/arch/arm/mach-omap2/board-rx51.c
index 03663c2..f234dee 100644
--- a/arch/arm/mach-omap2/board-rx51.c
+++ b/arch/arm/mach-omap2/board-rx51.c
@@ -2,6 +2,8 @@ 
  * Board support file for Nokia N900 (aka RX-51).
  *
  * Copyright (C) 2007, 2008 Nokia
+ * Copyright (C) 2012 Ivaylo Dimitrov <freemangordon@abv.bg>
+ * Copyright (C) 2013 Pali Rohár <pali.rohar@gmail.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -21,6 +23,7 @@ 
 #include <linux/usb/musb.h>
 #include <linux/platform_data/spi-omap2-mcspi.h>
 
+#include <asm/cacheflush.h>
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
@@ -31,7 +34,14 @@ 
 #include "mux.h"
 #include "gpmc.h"
 #include "pm.h"
+#include "soc.h"
 #include "sdram-nokia.h"
+#include "omap-secure.h"
+
+/* Secure PPA (Primary Protected Application) APIs */
+#define RX51_PPA_HWRNG			29
+#define RX51_PPA_L2_INVAL		40
+#define RX51_PPA_WRITE_ACR		42
 
 #define RX51_GPIO_SLEEP_IND 162
 
@@ -90,6 +100,66 @@  static struct omap_musb_board_data musb_board_data = {
 	.power			= 0,
 };
 
+/**
+ * rx51_secure_dispatcher: Routine to dispatch secure PPA API calls
+ * @idx: The PPA API index
+ * @process: Process ID
+ * @flag: The flag indicating criticality of operation
+ * @nargs: Number of valid arguments out of four.
+ * @arg1, arg2, arg3 args4: Parameters passed to secure API
+ *
+ * Return the non-zero error value on failure.
+ */
+static u32 rx51_secure_dispatcher(u32 idx, u32 process, u32 flag, u32 nargs,
+			   u32 arg1, u32 arg2, u32 arg3, u32 arg4)
+{
+	u32 ret;
+	u32 param[5];
+
+	param[0] = nargs+1; /* RX-51 needs number of arguments + 1 */
+	param[1] = arg1;
+	param[2] = arg2;
+	param[3] = arg3;
+	param[4] = arg4;
+
+	/*
+	 * Secure API needs physical address
+	 * pointer for the parameters
+	 */
+	local_irq_disable();
+	local_fiq_disable();
+	flush_cache_all();
+	outer_clean_range(__pa(param), __pa(param + 5));
+	ret = omap_smc3(idx, process, flag, __pa(param));
+	flush_cache_all();
+	local_fiq_enable();
+	local_irq_enable();
+
+	return ret;
+}
+
+/**
+ * rx51_secure_update_aux_cr: Routine to modify the contents of Auxiliary Control Register
+ *  @set_bits: bits to set in ACR
+ *  @clr_bits: bits to clear in ACR
+ *
+ * Return the non-zero error value on failure.
+*/
+static u32 rx51_secure_update_aux_cr(u32 set_bits, u32 clear_bits)
+{
+	u32 acr;
+
+	/* Read ACR */
+	asm volatile ("mrc p15, 0, %0, c1, c0, 1" : "=r" (acr));
+	acr &= ~clear_bits;
+	acr |= set_bits;
+
+	return rx51_secure_dispatcher(RX51_PPA_WRITE_ACR,
+				      0,
+				      FLAG_START_CRITICAL,
+				      1, acr, 0, 0, 0);
+}
+
 static void __init rx51_init(void)
 {
 	struct omap_sdrc_params *sdrc_params;
@@ -105,6 +175,14 @@  static void __init rx51_init(void)
 	rx51_peripherals_init();
 	rx51_camera_init();
 
+	if (omap_type() == OMAP2_DEVICE_TYPE_SEC) {
+#ifdef CONFIG_ARM_ERRATA_430973
+		pr_info("RX-51: Enabling ARM errata 430973 workaround\n");
+		/* set IBE to 1 */
+		rx51_secure_update_aux_cr(BIT(6), 0);
+#endif
+	}
+
 	/* Ensure SDRC pins are mux'd for self-refresh */
 	omap_mux_init_signal("sdrc_cke0", OMAP_PIN_OUTPUT);
 	omap_mux_init_signal("sdrc_cke1", OMAP_PIN_OUTPUT);