Re: [Qemu-devel] [PATCH v5 04/31] sdhci: add clock capabilities (Spec v1)

[Philippe Mathieu-Daudé]

On 01/08/2018 07:22 PM, Alistair Francis wrote:
> On Mon, Jan 8, 2018 at 7:42 AM, Philippe Mathieu-Daudé <address@hidden> wrote:
>> Signed-off-by: Philippe Mathieu-Daudé <address@hidden>
>> ---
>>  include/hw/sd/sdhci.h |  2 ++
>>  hw/sd/sdhci.c         | 52 
>> +++++++++++++++++++++++++++++++--------------------
>>  2 files changed, 34 insertions(+), 20 deletions(-)
>>
>> diff --git a/include/hw/sd/sdhci.h b/include/hw/sd/sdhci.h
>> index 2703da1d5a..c1602becd2 100644
>> --- a/include/hw/sd/sdhci.h
>> +++ b/include/hw/sd/sdhci.h
>> @@ -103,6 +103,8 @@ typedef struct SDHCIState {
>>      bool pending_insert_quirk; /* Quirk for Raspberry Pi card insert int */
>>      uint8_t spec_version;
>>      struct {
>> +        uint8_t timeout_clk_freq, base_clk_freq_mhz;
>> +        bool timeout_clk_in_mhz;
>>          uint16_t max_blk_len;
>>          bool suspend;
>>          bool high_speed;
>> diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c
>> index c78643fe54..05681c86d6 100644
>> --- a/hw/sd/sdhci.c
>> +++ b/hw/sd/sdhci.c
>> @@ -46,36 +46,31 @@
>>  #define SDHC_CAPAB_64BITBUS       0ul        /* 64-bit System Bus Support */
>>  #define SDHC_CAPAB_ADMA1          1ul        /* ADMA1 support */
>>  #define SDHC_CAPAB_ADMA2          1ul        /* ADMA2 support */
>> -/* 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_ADMA2 > 1 || SDHC_CAPAB_ADMA1 > 1 
>> || \
>> -    SDHC_CAPAB_TOUNIT > 1
>> +#if SDHC_CAPAB_64BITBUS > 1 || SDHC_CAPAB_ADMA2 > 1 || SDHC_CAPAB_ADMA1 > 1
>>  #error Capabilities features can have value 0 or 1 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_ADMA1 << 20) |   \
>> -    (SDHC_CAPAB_ADMA2 << 19) |                                 \
>> -    (SDHC_CAPAB_BASECLKFREQ << 8) | (SDHC_CAPAB_TOUNIT << 7) | \
>> -    (SDHC_CAPAB_TOCLKFREQ))
>> +    (SDHC_CAPAB_ADMA2 << 19))
>>
>>  #define MASKED_WRITE(reg, mask, val)  (reg = (reg & (mask)) | (val))
>>
>> +static void sdhci_check_capab_freq_range(SDHCIState *s, const char *desc,
>> +                                         uint8_t freq, Error **errp)
>> +{
>> +    switch (freq) {
>> +    case 0:
>> +    case 10 ... 63:
>> +        break;
> 
> You are missing a default here.

Thanks, peer review is useful :)

I didn't try qtest expected failures yet, I'll see if it's doable.

> 
> Alistair
> 
>> +        error_setg(errp, "SD %s clock frequency can have value"
>> +                   "in range 0-63 only", desc);
>> +        return;
>> +    }
>> +}
>> +
>>  static void sdhci_init_capareg(SDHCIState *s, Error **errp)
>>  {
>>      uint64_t capareg = 0;
>> @@ -83,6 +78,16 @@ static void sdhci_init_capareg(SDHCIState *s, Error 
>> **errp)
>>
>>      switch (s->spec_version) {
>>      case 1:
>> +        sdhci_check_capab_freq_range(s, "Timeout", s->cap.timeout_clk_freq,
>> +                                     errp);
>> +        capareg = FIELD_DP64(capareg, SDHC_CAPAB, TOCLKFREQ,
>> +                             s->cap.timeout_clk_freq);
>> +        sdhci_check_capab_freq_range(s, "Base", s->cap.base_clk_freq_mhz, 
>> errp);
>> +        capareg = FIELD_DP64(capareg, SDHC_CAPAB, BASECLKFREQ,
>> +                             s->cap.base_clk_freq_mhz);
>> +        capareg = FIELD_DP64(capareg, SDHC_CAPAB, TOUNIT,
>> +                             s->cap.timeout_clk_in_mhz);
>> +
>>          val = ctz32(s->cap.max_blk_len >> 9);
>>          if (val >= 0b11) {
>>              error_setg(errp, "block size can be 512, 1024 or 2048 only");
>> @@ -1304,6 +1309,13 @@ const VMStateDescription sdhci_vmstate = {
>>  static Property sdhci_properties[] = {
>>      DEFINE_PROP_UINT8("sd-spec-version", SDHCIState, spec_version, 2),
>>
>> +    /* Timeout clock frequency 1-63, 0 - not defined */
>> +    DEFINE_PROP_UINT8("timeout-freq", SDHCIState, cap.timeout_clk_freq, 0),
>> +    /* Timeout clock unit 0 - kHz, 1 - MHz */
>> +    DEFINE_PROP_BOOL("freq-in-mhz", SDHCIState, cap.timeout_clk_in_mhz, 
>> true),
>> +    /* Maximum base clock frequency for SD clock in MHz (range 10-63 MHz, 
>> 0) */
>> +    DEFINE_PROP_UINT8("max-frequency", SDHCIState, cap.base_clk_freq_mhz, 
>> 0),
>> +
>>      /* Maximum host controller R/W buffers size
>>       * Possible values: 512, 1024, 2048 bytes */
>>      DEFINE_PROP_UINT16("max-block-length", SDHCIState, cap.max_blk_len, 
>> 512),
>> --
>> 2.15.1
>>
>>