linux-kernel - Re: [PATCH 11/15] ARM: etm: Check arch version and disable data tracing for ptm

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Date:	Thu, 28 Jun 2012 18:07:48 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	John Stultz <john.stultz@...aro.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Arve Hjønnevåg <arve@...roid.com>,
	Russell King <linux@....linux.org.uk>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: Re: [PATCH 11/15] ARM: etm: Check arch version and disable data
 tracing for ptm

On Thu, Jun 21, 2012 at 12:47 AM, John Stultz <john.stultz@...aro.org> wrote:

> +#define ETMR_ID                        0x1e4
> +#define ETMIDR_VERSION(x)      (((x) >> 4) & 0xff)
> +#define ETMIDR_VERSION_PFT_1_0 0x30

NAK don't reinvent this stuff.

>From <linux/amba/bus.h>

Use these macros on the periphid:
#define amba_config(d)  AMBA_CONFIG_BITS((d)->periphid)
#define amba_rev(d)     AMBA_REV_BITS((d)->periphid)
#define amba_manf(d)    AMBA_MANF_BITS((d)->periphid)
#define amba_part(d)    AMBA_PART_BITS((d)->periphid)

I thin amba_rev() is the one you're looking for (not sure).

So here:

> @@ -724,6 +724,9 @@ static int __devinit etm_probe(struct amba_device *dev, const struct amba_id *id

> +       if (etmccr & ETMCCR_ETMIDR_PRESENT) {
> +               etmidr = etm_readl(t, t->etm_regs_count, ETMR_ID);
> +               etm_version = ETMIDR_VERSION(etmidr);

etm_version = amba_rev(dev);

etc.

Yours,
Linus Walleij
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