Re: [Qemu-devel] [PATCH v9 08/16] sdhci: use a numeric value for the default CAPAB register

[Alistair Francis]

On Mon, Jan 22, 2018 at 6:08 PM, Philippe Mathieu-Daudé <address@hidden> wrote:
> using many #defines is not portable when scaling to different HCI.
>
> Signed-off-by: Philippe Mathieu-Daudé <address@hidden>

Reviewed-by: Alistair Francis <address@hidden>

Alistair

> ---
>  hw/sd/sdhci.c | 74 
> +++++++++++++----------------------------------------------
>  1 file changed, 16 insertions(+), 58 deletions(-)
>
> diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c
> index 1331062306..1c781c4ba5 100644
> --- a/hw/sd/sdhci.c
> +++ b/hw/sd/sdhci.c
> @@ -39,67 +39,25 @@
>  #define TYPE_SDHCI_BUS "sdhci-bus"
>  #define SDHCI_BUS(obj) OBJECT_CHECK(SDBus, (obj), TYPE_SDHCI_BUS)
>
> +#define MASKED_WRITE(reg, mask, val)  (reg = (reg & (mask)) | (val))
> +
>  /* Default SD/MMC host controller features information, which will be
>   * presented in CAPABILITIES register of generic SD host controller at reset.
> - * If not stated otherwise:
> - * 0 - not supported, 1 - supported, other - prohibited.
> + *
> + * support:
> + * - 3.3v and 1.8v voltages
> + * - SDMA/ADMA1/ADMA2
> + * - high-speed
> + * max host controller R/W buffers size: 512B
> + * max clock frequency for SDclock: 52 MHz
> + * timeout clock frequency: 52 MHz
> + *
> + * does not support:
> + * - 3.0v voltage
> + * - 64-bit system bus
> + * - suspend/resume
>   */
> -#define SDHC_CAPAB_64BITBUS       0ul        /* 64-bit System Bus Support */
> -#define SDHC_CAPAB_18V            1ul        /* Voltage support 1.8v */
> -#define SDHC_CAPAB_30V            0ul        /* Voltage support 3.0v */
> -#define SDHC_CAPAB_33V            1ul        /* Voltage support 3.3v */
> -#define SDHC_CAPAB_SUSPRESUME     0ul        /* Suspend/resume support */
> -#define SDHC_CAPAB_SDMA           1ul        /* SDMA support */
> -#define SDHC_CAPAB_HIGHSPEED      1ul        /* High speed support */
> -#define SDHC_CAPAB_ADMA1          1ul        /* ADMA1 support */
> -#define SDHC_CAPAB_ADMA2          1ul        /* ADMA2 support */
> -/* Maximum host controller R/W buffers size
> - * Possible values: 512, 1024, 2048 bytes */
> -#define SDHC_CAPAB_MAXBLOCKLENGTH 512ul
> -/* Maximum clock frequency for SDclock in MHz
> - * value in range 10-63 MHz, 0 - not defined */
> -#define SDHC_CAPAB_BASECLKFREQ    52ul
> -#define SDHC_CAPAB_TOUNIT         1ul  /* Timeout clock unit 0 - kHz, 1 - 
> MHz */
> -/* Timeout clock frequency 1-63, 0 - not defined */
> -#define SDHC_CAPAB_TOCLKFREQ      52ul
> -
> -/* Now check all parameters and calculate CAPABILITIES REGISTER value */
> -#if SDHC_CAPAB_64BITBUS > 1 || SDHC_CAPAB_18V > 1 || SDHC_CAPAB_30V > 1 ||   
>   \
> -    SDHC_CAPAB_33V > 1 || SDHC_CAPAB_SUSPRESUME > 1 || SDHC_CAPAB_SDMA > 1 
> ||  \
> -    SDHC_CAPAB_HIGHSPEED > 1 || SDHC_CAPAB_ADMA2 > 1 || SDHC_CAPAB_ADMA1 > 1 
> ||\
> -    SDHC_CAPAB_TOUNIT > 1
> -#error Capabilities features can have value 0 or 1 only!
> -#endif
> -
> -#if SDHC_CAPAB_MAXBLOCKLENGTH == 512
> -#define MAX_BLOCK_LENGTH 0ul
> -#elif SDHC_CAPAB_MAXBLOCKLENGTH == 1024
> -#define MAX_BLOCK_LENGTH 1ul
> -#elif SDHC_CAPAB_MAXBLOCKLENGTH == 2048
> -#define MAX_BLOCK_LENGTH 2ul
> -#else
> -#error Max host controller block size can have value 512, 1024 or 2048 only!
> -#endif
> -
> -#if (SDHC_CAPAB_BASECLKFREQ > 0 && SDHC_CAPAB_BASECLKFREQ < 10) || \
> -    SDHC_CAPAB_BASECLKFREQ > 63
> -#error SDclock frequency can have value in range 0, 10-63 only!
> -#endif
> -
> -#if SDHC_CAPAB_TOCLKFREQ > 63
> -#error Timeout clock frequency can have value in range 0-63 only!
> -#endif
> -
> -#define SDHC_CAPAB_REG_DEFAULT                                 \
> -   ((SDHC_CAPAB_64BITBUS << 28) | (SDHC_CAPAB_18V << 26) |     \
> -    (SDHC_CAPAB_30V << 25) | (SDHC_CAPAB_33V << 24) |          \
> -    (SDHC_CAPAB_SUSPRESUME << 23) | (SDHC_CAPAB_SDMA << 22) |  \
> -    (SDHC_CAPAB_HIGHSPEED << 21) | (SDHC_CAPAB_ADMA1 << 20) |  \
> -    (SDHC_CAPAB_ADMA2 << 19) | (MAX_BLOCK_LENGTH << 16) |      \
> -    (SDHC_CAPAB_BASECLKFREQ << 8) | (SDHC_CAPAB_TOUNIT << 7) | \
> -    (SDHC_CAPAB_TOCLKFREQ))
> -
> -#define MASKED_WRITE(reg, mask, val)  (reg = (reg & (mask)) | (val))
> +#define SDHC_CAPAB_REG_DEFAULT 0x057834b4
>
>  static uint8_t sdhci_slotint(SDHCIState *s)
>  {
> --
> 2.15.1
>
>