[U-Boot] [PATCH] mmc: sdhci: Add the programmable clock mode support
Jaehoon Chung
jh80.chung at samsung.com
Mon Aug 22 04:24:04 CEST 2016
Hi Wenyou,
On 08/16/2016 10:02 AM, Jaehoon Chung wrote:
> Hi Andreas,
>
> On 08/15/2016 01:17 AM, Andreas Bießmann wrote:
>> Dear Pantelis,
>>
>> On 20.06.16 03:58, Wenyou Yang wrote:
>>> Add the programmable clock mode for the clock generator.
>>>
Sorry for reviewing too late.
First, this patch needs to rebase on latest u-boot-mmc.
Then I will check this patch on my boards..
>>
>> this one is delegated to me, but I think it is out of my scope. Could
>> you please have a look?
>
> I will be delegated to me. I will check this patch.
>
> Thanks.
>
> Best Regards,
> Jaehoon Chung
>
>>
>> Andreas
>>
>>> Signed-off-by: Wenyou Yang <wenyou.yang at atmel.com>
>>> ---
>>>
>>> drivers/mmc/sdhci.c | 49 +++++++++++++++++++++++++++++++++++++++----------
>>> include/sdhci.h | 15 +++++++++++++++
>>> 2 files changed, 54 insertions(+), 10 deletions(-)
>>>
>>> diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
>>> index 5c71ab8..ee6d4a1 100644
>>> --- a/drivers/mmc/sdhci.c
>>> +++ b/drivers/mmc/sdhci.c
>>> @@ -286,7 +286,7 @@ static int sdhci_send_command(struct mmc *mmc, struct mmc_cmd *cmd,
>>> static int sdhci_set_clock(struct mmc *mmc, unsigned int clock)
>>> {
>>> struct sdhci_host *host = mmc->priv;
>>> - unsigned int div, clk, timeout, reg;
>>> + unsigned int div, clk = 0, timeout, reg;
>>>
>>> /* Wait max 20 ms */
>>> timeout = 200;
>>> @@ -310,14 +310,35 @@ static int sdhci_set_clock(struct mmc *mmc, unsigned int clock)
>>> return 0;
>>>
>>> if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300) {
>>> - /* Version 3.00 divisors must be a multiple of 2. */
>>> - if (mmc->cfg->f_max <= clock)
>>> - div = 1;
>>> - else {
>>> - for (div = 2; div < SDHCI_MAX_DIV_SPEC_300; div += 2) {
>>> - if ((mmc->cfg->f_max / div) <= clock)
>>> + /*
>>> + * Check if the Host Controller supports Programmable Clock
>>> + * Mode.
>>> + */
>>> + if (host->clk_mul) {
>>> + for (div = 1; div <= 1024; div++) {
>>> + if ((mmc->cfg->f_max * host->clk_mul / div)
>>> + <= clock)
>>> break;
>>> }
>>> +
>>> + /*
>>> + * Set Programmable Clock Mode in the Clock
>>> + * Control register.
>>> + */
>>> + clk = SDHCI_PROG_CLOCK_MODE;
>>> + div--;
>>> + } else {
>>> + /* Version 3.00 divisors must be a multiple of 2. */
>>> + if (mmc->cfg->f_max <= clock) {
>>> + div = 1;
>>> + } else {
>>> + for (div = 2;
>>> + div < SDHCI_MAX_DIV_SPEC_300; div += 2) {
>>> + if ((mmc->cfg->f_max / div) <= clock)
>>> + break;
>>> + }
>>> + }
>>> + div >>= 1;
>>> }
>>> } else {
>>> /* Version 2.00 divisors must be a power of 2. */
>>> @@ -325,13 +346,13 @@ static int sdhci_set_clock(struct mmc *mmc, unsigned int clock)
>>> if ((mmc->cfg->f_max / div) <= clock)
>>> break;
>>> }
>>> + div >>= 1;
>>> }
>>> - div >>= 1;
>>>
>>> if (host->set_clock)
>>> host->set_clock(host->index, div);
>>>
>>> - clk = (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
>>> + clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
>>> clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
>>> << SDHCI_DIVIDER_HI_SHIFT;
>>> clk |= SDHCI_CLOCK_INT_EN;
>>> @@ -480,7 +501,7 @@ static const struct mmc_ops sdhci_ops = {
>>>
>>> int add_sdhci(struct sdhci_host *host, u32 max_clk, u32 min_clk)
>>> {
>>> - unsigned int caps;
>>> + unsigned int caps, caps_1;
>>>
>>> host->cfg.name = host->name;
>>> host->cfg.ops = &sdhci_ops;
>>> @@ -546,6 +567,14 @@ int add_sdhci(struct sdhci_host *host, u32 max_clk, u32 min_clk)
>>>
>>> host->cfg.b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
>>>
>>> + /*
>>> + * In case of Host Controller v3.00, find out whether clock
>>> + * multiplier is supported.
>>> + */
>>> + caps_1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
>>> + host->clk_mul = (caps_1 & SDHCI_CLOCK_MUL_MASK) >>
>>> + SDHCI_CLOCK_MUL_SHIFT;
>>> +
>>> sdhci_reset(host, SDHCI_RESET_ALL);
>>>
>>> host->mmc = mmc_create(&host->cfg, host);
>>> diff --git a/include/sdhci.h b/include/sdhci.h
>>> index e0f6667..5abe0a2 100644
>>> --- a/include/sdhci.h
>>> +++ b/include/sdhci.h
>>> @@ -97,6 +97,7 @@
>>> #define SDHCI_DIV_MASK 0xFF
>>> #define SDHCI_DIV_MASK_LEN 8
>>> #define SDHCI_DIV_HI_MASK 0x300
>>> +#define SDHCI_PROG_CLOCK_MODE 0x0020
>>> #define SDHCI_CLOCK_CARD_EN 0x0004
>>> #define SDHCI_CLOCK_INT_STABLE 0x0002
>>> #define SDHCI_CLOCK_INT_EN 0x0001
>>> @@ -166,6 +167,19 @@
>>> #define SDHCI_CAN_64BIT 0x10000000
>>>
>>> #define SDHCI_CAPABILITIES_1 0x44
>>> +#define SDHCI_SUPPORT_SDR50 0x00000001
>>> +#define SDHCI_SUPPORT_SDR104 0x00000002
>>> +#define SDHCI_SUPPORT_DDR50 0x00000004
>>> +#define SDHCI_DRIVER_TYPE_A 0x00000010
>>> +#define SDHCI_DRIVER_TYPE_C 0x00000020
>>> +#define SDHCI_DRIVER_TYPE_D 0x00000040
>>> +#define SDHCI_RETUNING_TIMER_COUNT_MASK 0x00000F00
>>> +#define SDHCI_RETUNING_TIMER_COUNT_SHIFT 8
>>> +#define SDHCI_USE_SDR50_TUNING 0x00002000
>>> +#define SDHCI_RETUNING_MODE_MASK 0x0000C000
>>> +#define SDHCI_RETUNING_MODE_SHIFT 14
>>> +#define SDHCI_CLOCK_MUL_MASK 0x00FF0000
>>> +#define SDHCI_CLOCK_MUL_SHIFT 16
>>>
>>> #define SDHCI_MAX_CURRENT 0x48
>>>
>>> @@ -240,6 +254,7 @@ struct sdhci_host {
>>> unsigned int quirks;
>>> unsigned int host_caps;
>>> unsigned int version;
>>> + unsigned int clk_mul; /* Clock Muliplier value */
s/Muliplier/Multiplier
Best Regards,
Jaehoon Chung
>>> unsigned int clock;
>>> struct mmc *mmc;
>>> const struct sdhci_ops *ops;
>>>
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