diff options
| author | Ashok Reddy Soma <ashok.reddy.soma@xilinx.com> | 2021-07-09 05:53:41 -0600 |
|---|---|---|
| committer | Michal Simek <michal.simek@xilinx.com> | 2021-07-26 09:18:45 +0200 |
| commit | ee9ae005dc4cbd0a9a792c0b78385055f18b9a8a (patch) | |
| tree | 22f3679579c0e6465eb7f9c9889d2111799c17e6 | |
| parent | affcba728b90428f38e6ea6b945935146c8f3dcb (diff) | |
mmc: zynq_sdhci: Use Mask writes for Tap delays
Restrict tap_delay value to the allowed size(8bits for itap and 6 bits
for otap) before writing to the tap delay register.
Clear ITAP and OTAP delay bits before updating with the new tap value
for Versal platform.
Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
| -rw-r--r-- | drivers/mmc/zynq_sdhci.c | 58 |
1 files changed, 31 insertions, 27 deletions
diff --git a/drivers/mmc/zynq_sdhci.c b/drivers/mmc/zynq_sdhci.c index f65a87a4e14..bf638e96758 100644 --- a/drivers/mmc/zynq_sdhci.c +++ b/drivers/mmc/zynq_sdhci.c @@ -19,11 +19,13 @@ #include <sdhci.h> #include <zynqmp_tap_delay.h> -#define SDHCI_ARASAN_ITAPDLY_REGISTER 0xF0F8 -#define SDHCI_ARASAN_OTAPDLY_REGISTER 0xF0FC -#define SDHCI_ITAPDLY_CHGWIN 0x200 -#define SDHCI_ITAPDLY_ENABLE 0x100 -#define SDHCI_OTAPDLY_ENABLE 0x40 +#define SDHCI_ARASAN_ITAPDLY_REGISTER 0xF0F8 +#define SDHCI_ARASAN_ITAPDLY_SEL_MASK GENMASK(7, 0) +#define SDHCI_ARASAN_OTAPDLY_REGISTER 0xF0FC +#define SDHCI_ARASAN_OTAPDLY_SEL_MASK GENMASK(5, 0) +#define SDHCI_ITAPDLY_CHGWIN BIT(9) +#define SDHCI_ITAPDLY_ENABLE BIT(8) +#define SDHCI_OTAPDLY_ENABLE BIT(6) #define SDHCI_TUNING_LOOP_COUNT 40 #define MMC_BANK2 0x2 @@ -297,6 +299,7 @@ static int sdhci_versal_sdcardclk_set_phase(struct sdhci_host *host, struct mmc *mmc = (struct mmc *)host->mmc; u8 tap_delay, tap_max = 0; int timing = mode2timing[mmc->selected_mode]; + u32 regval; /* * This is applicable for SDHCI_SPEC_300 and above @@ -329,16 +332,16 @@ static int sdhci_versal_sdcardclk_set_phase(struct sdhci_host *host, tap_delay = (degrees * tap_max) / 360; + /* Limit output tap_delay value to 6 bits */ + tap_delay &= SDHCI_ARASAN_OTAPDLY_SEL_MASK; + /* Set the Clock Phase */ - if (tap_delay) { - u32 regval; - - regval = sdhci_readl(host, SDHCI_ARASAN_OTAPDLY_REGISTER); - regval |= SDHCI_OTAPDLY_ENABLE; - sdhci_writel(host, regval, SDHCI_ARASAN_OTAPDLY_REGISTER); - regval |= tap_delay; - sdhci_writel(host, regval, SDHCI_ARASAN_OTAPDLY_REGISTER); - } + regval = sdhci_readl(host, SDHCI_ARASAN_OTAPDLY_REGISTER); + regval |= SDHCI_OTAPDLY_ENABLE; + sdhci_writel(host, regval, SDHCI_ARASAN_OTAPDLY_REGISTER); + regval &= ~SDHCI_ARASAN_OTAPDLY_SEL_MASK; + regval |= tap_delay; + sdhci_writel(host, regval, SDHCI_ARASAN_OTAPDLY_REGISTER); return 0; } @@ -358,6 +361,7 @@ static int sdhci_versal_sampleclk_set_phase(struct sdhci_host *host, struct mmc *mmc = (struct mmc *)host->mmc; u8 tap_delay, tap_max = 0; int timing = mode2timing[mmc->selected_mode]; + u32 regval; /* * This is applicable for SDHCI_SPEC_300 and above @@ -390,20 +394,20 @@ static int sdhci_versal_sampleclk_set_phase(struct sdhci_host *host, tap_delay = (degrees * tap_max) / 360; + /* Limit input tap_delay value to 8 bits */ + tap_delay &= SDHCI_ARASAN_ITAPDLY_SEL_MASK; + /* Set the Clock Phase */ - if (tap_delay) { - u32 regval; - - regval = sdhci_readl(host, SDHCI_ARASAN_ITAPDLY_REGISTER); - regval |= SDHCI_ITAPDLY_CHGWIN; - sdhci_writel(host, regval, SDHCI_ARASAN_ITAPDLY_REGISTER); - regval |= SDHCI_ITAPDLY_ENABLE; - sdhci_writel(host, regval, SDHCI_ARASAN_ITAPDLY_REGISTER); - regval |= tap_delay; - sdhci_writel(host, regval, SDHCI_ARASAN_ITAPDLY_REGISTER); - regval &= ~SDHCI_ITAPDLY_CHGWIN; - sdhci_writel(host, regval, SDHCI_ARASAN_ITAPDLY_REGISTER); - } + regval = sdhci_readl(host, SDHCI_ARASAN_ITAPDLY_REGISTER); + regval |= SDHCI_ITAPDLY_CHGWIN; + sdhci_writel(host, regval, SDHCI_ARASAN_ITAPDLY_REGISTER); + regval |= SDHCI_ITAPDLY_ENABLE; + sdhci_writel(host, regval, SDHCI_ARASAN_ITAPDLY_REGISTER); + regval &= ~SDHCI_ARASAN_ITAPDLY_SEL_MASK; + regval |= tap_delay; + sdhci_writel(host, regval, SDHCI_ARASAN_ITAPDLY_REGISTER); + regval &= ~SDHCI_ITAPDLY_CHGWIN; + sdhci_writel(host, regval, SDHCI_ARASAN_ITAPDLY_REGISTER); return 0; } |