linux-kernel - Re: [PATCH v3 13/26] coresight: etm4x: Add commentary on the registers

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Message-ID: <CANLsYkxhsj39+oG6i8hWLUsrU5shSTEq88_6_5zmAJcbFjTMgA@mail.gmail.com>
Date:   Tue, 3 Nov 2020 12:04:59 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Mike Leach <mike.leach@...aro.org>,
        Coresight ML <coresight@...ts.linaro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 13/26] coresight: etm4x: Add commentary on the registers

On Wed, 28 Oct 2020 at 16:10, Suzuki K Poulose <suzuki.poulose@....com> wrote:
>
> As we are about define a switch..case table for individual register
> access by offset for implementing the system instruction support,
> document the possible set of registers for each group to make
> it easier to co-relate.

s/co-relate/correlate

>
> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
> Cc: Mike Leach <mike.leach@...aro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> ---
>  drivers/hwtracing/coresight/coresight-etm4x.h | 21 ++++++++++++-------
>  1 file changed, 13 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h
> index 14e0f29db6b3..510828c73db6 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.h
> +++ b/drivers/hwtracing/coresight/coresight-etm4x.h
> @@ -44,13 +44,13 @@
>  #define TRCVDSACCTLR                   0x0A4
>  #define TRCVDARCCTLR                   0x0A8
>  /* Derived resources registers */
> -#define TRCSEQEVRn(n)                  (0x100 + (n * 4))
> +#define TRCSEQEVRn(n)                  (0x100 + (n * 4)) /* n = 0-2 */
>  #define TRCSEQRSTEVR                   0x118
>  #define TRCSEQSTR                      0x11C
>  #define TRCEXTINSELR                   0x120
> -#define TRCCNTRLDVRn(n)                        (0x140 + (n * 4))
> -#define TRCCNTCTLRn(n)                 (0x150 + (n * 4))
> -#define TRCCNTVRn(n)                   (0x160 + (n * 4))
> +#define TRCCNTRLDVRn(n)                        (0x140 + (n * 4)) /* n = 0-3 */
> +#define TRCCNTCTLRn(n)                 (0x150 + (n * 4)) /* n = 0-3 */
> +#define TRCCNTVRn(n)                   (0x160 + (n * 4)) /* n = 0-3 */
>  /* ID registers */
>  #define TRCIDR8                                0x180
>  #define TRCIDR9                                0x184
> @@ -59,7 +59,7 @@
>  #define TRCIDR12                       0x190
>  #define TRCIDR13                       0x194
>  #define TRCIMSPEC0                     0x1C0
> -#define TRCIMSPECn(n)                  (0x1C0 + (n * 4))
> +#define TRCIMSPECn(n)                  (0x1C0 + (n * 4)) /* n = 1-7 */
>  #define TRCIDR0                                0x1E0
>  #define TRCIDR1                                0x1E4
>  #define TRCIDR2                                0x1E8
> @@ -68,9 +68,12 @@
>  #define TRCIDR5                                0x1F4
>  #define TRCIDR6                                0x1F8
>  #define TRCIDR7                                0x1FC
> -/* Resource selection registers */
> +/*
> + * Resource selection registers, n = 2-31.
> + * First pair (regs 0, 1) is always present and is reserved.
> + */
>  #define TRCRSCTLRn(n)                  (0x200 + (n * 4))
> -/* Single-shot comparator registers */
> +/* Single-shot comparator registers, n = 0-7 */
>  #define TRCSSCCRn(n)                   (0x280 + (n * 4))
>  #define TRCSSCSRn(n)                   (0x2A0 + (n * 4))
>  #define TRCSSPCICRn(n)                 (0x2C0 + (n * 4))
> @@ -80,11 +83,13 @@
>  #define TRCPDCR                                0x310
>  #define TRCPDSR                                0x314
>  /* Trace registers (0x318-0xEFC) */
> -/* Comparator registers */
> +/* Address Comparator registers n = 0-15 */
>  #define TRCACVRn(n)                    (0x400 + (n * 8))
>  #define TRCACATRn(n)                   (0x480 + (n * 8))
> +/* Data Value Comparator Value registers, n = 0-7 */
>  #define TRCDVCVRn(n)                   (0x500 + (n * 16))
>  #define TRCDVCMRn(n)                   (0x580 + (n * 16))
> +/* ContextID/Virtual ContextID comparators, n = 0-7 */
>  #define TRCCIDCVRn(n)                  (0x600 + (n * 8))
>  #define TRCVMIDCVRn(n)                 (0x640 + (n * 8))
>  #define TRCCIDCCTLR0                   0x680
> --
> 2.24.1
>