On STM32MP25, the delay block is inside the SoC, and configured through
the SYSCFG registers. The algorithm is also different from what was in
STM32MP1 chip.
Signed-off-by: Yann Gautier <yann.gautier@xxxxxxxxxxx>
---
drivers/mmc/host/mmci_stm32_sdmmc.c | 66 ++++++++++++++++++++++++++++-
1 file changed, 65 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/mmci_stm32_sdmmc.c b/drivers/mmc/host/mmci_stm32_sdmmc.c
index c51c85ca24917..d6112a8dacf8b 100644
--- a/drivers/mmc/host/mmci_stm32_sdmmc.c
+++ b/drivers/mmc/host/mmci_stm32_sdmmc.c
@@ -33,6 +33,20 @@
#define DLYB_LNG_TIMEOUT_US 1000
#define SDMMC_VSWEND_TIMEOUT_US 10000
+#define SYSCFG_DLYBSD_CR 0x0
+#define DLYBSD_CR_EN BIT(0)
+#define DLYBSD_CR_RXTAPSEL_MASK GENMASK(6, 1)
+#define DLYBSD_TAPSEL_NB 32
+#define DLYBSD_BYP_EN BIT(16)
+#define DLYBSD_BYP_CMD GENMASK(21, 17)
+#define DLYBSD_ANTIGLITCH_EN BIT(22)
+
+#define SYSCFG_DLYBSD_SR 0x4
+#define DLYBSD_SR_LOCK BIT(0)
+#define DLYBSD_SR_RXTAPSEL_ACK BIT(1)
+
+#define DLYBSD_TIMEOUT_1S_IN_US 1000000
+
struct sdmmc_lli_desc {
u32 idmalar;
u32 idmabase;
@@ -499,6 +513,46 @@ static int sdmmc_dlyb_mp15_prepare(struct mmci_host *host)
return 0;
}
+static int sdmmc_dlyb_mp25_enable(struct sdmmc_dlyb *dlyb)
+{
+ u32 cr, sr;
+
+ cr = readl_relaxed(dlyb->base + SYSCFG_DLYBSD_CR);
+ cr |= DLYBSD_CR_EN;
+
+ writel_relaxed(cr, dlyb->base + SYSCFG_DLYBSD_CR);
+
+ return readl_relaxed_poll_timeout(dlyb->base + SYSCFG_DLYBSD_SR,
+ sr, sr & DLYBSD_SR_LOCK, 1,
+ DLYBSD_TIMEOUT_1S_IN_US);
+}
+
+static int sdmmc_dlyb_mp25_set_cfg(struct sdmmc_dlyb *dlyb,
+ int unit __maybe_unused, int phase,
+ bool sampler __maybe_unused)
+{
+ u32 cr, sr;
+
+ cr = readl_relaxed(dlyb->base + SYSCFG_DLYBSD_CR);
+ cr &= ~DLYBSD_CR_RXTAPSEL_MASK;
+ cr |= FIELD_PREP(DLYBSD_CR_RXTAPSEL_MASK, phase);
+
+ writel_relaxed(cr, dlyb->base + SYSCFG_DLYBSD_CR);
+
+ return readl_relaxed_poll_timeout(dlyb->base + SYSCFG_DLYBSD_SR,
+ sr, sr & DLYBSD_SR_RXTAPSEL_ACK, 1,
+ DLYBSD_TIMEOUT_1S_IN_US);
+}
+
+static int sdmmc_dlyb_mp25_prepare(struct mmci_host *host)
+{
+ struct sdmmc_dlyb *dlyb = host->variant_priv;
+
+ dlyb->max = DLYBSD_TAPSEL_NB;
+
+ return 0;
+}
+
static int sdmmc_dlyb_phase_tuning(struct mmci_host *host, u32 opcode)
{
struct sdmmc_dlyb *dlyb = host->variant_priv;
@@ -639,6 +693,12 @@ static struct sdmmc_tuning_ops dlyb_tuning_mp15_ops = {
.set_cfg = sdmmc_dlyb_mp15_set_cfg,
};
+static struct sdmmc_tuning_ops dlyb_tuning_mp25_ops = {
+ .dlyb_enable = sdmmc_dlyb_mp25_enable,
+ .tuning_prepare = sdmmc_dlyb_mp25_prepare,
+ .set_cfg = sdmmc_dlyb_mp25_set_cfg,
+};
+
void sdmmc_variant_init(struct mmci_host *host)
{
struct device_node *np = host->mmc->parent->of_node;
@@ -657,7 +717,11 @@ void sdmmc_variant_init(struct mmci_host *host)
return;
dlyb->base = base_dlyb;
- dlyb->ops = &dlyb_tuning_mp15_ops;
+ if (of_device_is_compatible(np, "st,stm32mp25-sdmmc2"))
+ dlyb->ops = &dlyb_tuning_mp25_ops;
+ else
+ dlyb->ops = &dlyb_tuning_mp15_ops;
+
host->variant_priv = dlyb;
host->mmc_ops->execute_tuning = sdmmc_execute_tuning;
}
--
2.25.1
