[PATCH V6 17/24] mmc: sdhci-uhs2: add uhs2_control() to initialise the interface

[Victor Shih]

This is a sdhci version of mmc's uhs2_set_reg operation.
UHS-II interface (related registers) will be initialised here.

Signed-off-by: Ben Chuang <ben.chuang@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
Signed-off-by: Victor Shih <victor.shih@xxxxxxxxxxxxxxxxxxx>
---
 drivers/mmc/host/sdhci-uhs2.c | 92 +++++++++++++++++++++++++++++++++++
 drivers/mmc/host/sdhci.c      | 11 +++++
 2 files changed, 103 insertions(+)

diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
index c7e411fa0a6e..de15a6559702 100644
--- a/drivers/mmc/host/sdhci-uhs2.c
+++ b/drivers/mmc/host/sdhci-uhs2.c
@@ -276,6 +276,48 @@ static void __sdhci_uhs2_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 	sdhci_set_clock(host, host->clock);
 }
 
+static void sdhci_uhs2_set_config(struct sdhci_host *host)
+{
+	u32 value;
+	u16 sdhci_uhs2_set_ptr = sdhci_readw(host, SDHCI_UHS2_SETTINGS_PTR);
+	u16 sdhci_uhs2_gen_set_reg = (sdhci_uhs2_set_ptr + 0);
+	u16 sdhci_uhs2_phy_set_reg = (sdhci_uhs2_set_ptr + 4);
+	u16 sdhci_uhs2_tran_set_reg = (sdhci_uhs2_set_ptr + 8);
+	u16 sdhci_uhs2_tran_set_1_reg = (sdhci_uhs2_set_ptr + 12);
+
+	/* Set Gen Settings */
+	value = FIELD_PREP(SDHCI_UHS2_GEN_SETTINGS_N_LANES_MASK, host->mmc->uhs2_caps.n_lanes_set);
+	sdhci_writel(host, value, sdhci_uhs2_gen_set_reg);
+
+	/* Set PHY Settings */
+	value = FIELD_PREP(SDHCI_UHS2_PHY_N_LSS_DIR_MASK, host->mmc->uhs2_caps.n_lss_dir_set) |
+		FIELD_PREP(SDHCI_UHS2_PHY_N_LSS_SYN_MASK, host->mmc->uhs2_caps.n_lss_sync_set);
+	if (host->mmc->flags & MMC_UHS2_SPEED_B)
+		value |= SDHCI_UHS2_PHY_SET_SPEED_B;
+	sdhci_writel(host, value, sdhci_uhs2_phy_set_reg);
+
+	/* Set LINK-TRAN Settings */
+	value = FIELD_PREP(SDHCI_UHS2_TRAN_RETRY_CNT_MASK, host->mmc->uhs2_caps.max_retry_set) |
+		FIELD_PREP(SDHCI_UHS2_TRAN_N_FCU_MASK, host->mmc->uhs2_caps.n_fcu_set);
+	sdhci_writel(host, value, sdhci_uhs2_tran_set_reg);
+	sdhci_writel(host, host->mmc->uhs2_caps.n_data_gap_set, sdhci_uhs2_tran_set_1_reg);
+}
+
+static int sdhci_uhs2_check_dormant(struct sdhci_host *host)
+{
+	u32 val;
+	/* 100ms */
+	int timeout = 100000;
+
+	if (read_poll_timeout_atomic(sdhci_readl, val, (val & SDHCI_UHS2_IN_DORMANT_STATE),
+				     100, timeout, true, host, SDHCI_PRESENT_STATE)) {
+		pr_warn("%s: UHS2 IN_DORMANT fail in 100ms.\n", mmc_hostname(host->mmc));
+		sdhci_dumpregs(host);
+		return -EIO;
+	}
+	return 0;
+}
+
 /*****************************************************************************\
  *                                                                           *
  * MMC callbacks                                                             *
@@ -361,6 +403,55 @@ static int sdhci_uhs2_enable_clk(struct mmc_host *mmc)
 	return 0;
 }
 
+static int sdhci_uhs2_do_detect_init(struct mmc_host *mmc);
+
+static int sdhci_uhs2_control(struct mmc_host *mmc, enum sd_uhs2_operation op)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	int err = 0;
+	u16 sdhci_uhs2_set_ptr = sdhci_readw(host, SDHCI_UHS2_SETTINGS_PTR);
+	u16 sdhci_uhs2_phy_set_reg = (sdhci_uhs2_set_ptr + 4);
+
+	DBG("Begin uhs2 control, act %d.\n", op);
+
+	switch (op) {
+	case UHS2_PHY_INIT:
+		err = sdhci_uhs2_do_detect_init(mmc);
+		break;
+	case UHS2_SET_CONFIG:
+		sdhci_uhs2_set_config(host);
+		break;
+	case UHS2_ENABLE_INT:
+		sdhci_uhs2_clear_set_irqs(host, 0, SDHCI_INT_CARD_INT);
+		break;
+	case UHS2_DISABLE_INT:
+		sdhci_uhs2_clear_set_irqs(host, SDHCI_INT_CARD_INT, 0);
+		break;
+	case UHS2_SET_SPEED_B:
+		sdhci_writeb(host, SDHCI_UHS2_PHY_SET_SPEED_B, sdhci_uhs2_phy_set_reg);
+		break;
+	case UHS2_CHECK_DORMANT:
+		err = sdhci_uhs2_check_dormant(host);
+		break;
+	case UHS2_DISABLE_CLK:
+		err = sdhci_uhs2_disable_clk(mmc);
+		break;
+	case UHS2_ENABLE_CLK:
+		err = sdhci_uhs2_enable_clk(mmc);
+		break;
+	case UHS2_POST_ATTACH_SD:
+		host->ops->uhs2_post_attach_sd(host);
+		break;
+	default:
+		pr_err("%s: input sd uhs2 operation %d is wrong!\n",
+		       mmc_hostname(host->mmc), op);
+		err = -EIO;
+		break;
+	}
+
+	return err;
+}
+
 /*****************************************************************************\
  *                                                                           *
  * Driver init/exit                                                          *
@@ -489,6 +580,7 @@ static int sdhci_uhs2_host_ops_init(struct sdhci_host *host)
 	host->mmc_host_ops.start_signal_voltage_switch =
 		sdhci_uhs2_start_signal_voltage_switch;
 	host->mmc_host_ops.uhs2_set_ios = sdhci_uhs2_set_ios;
+	host->mmc_host_ops.uhs2_control = sdhci_uhs2_control;
 
 	return 0;
 }
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 49bbdc155b2b..3656e66fcca7 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -234,6 +234,17 @@ void sdhci_reset(struct sdhci_host *host, u8 mask)
 }
 EXPORT_SYMBOL_GPL(sdhci_reset);
 
+void sdhci_clear_set_irqs(struct sdhci_host *host, u32 clear, u32 set)
+{
+	u32 ier;
+
+	ier = sdhci_readl(host, SDHCI_INT_ENABLE);
+	ier &= ~clear;
+	ier |= set;
+	sdhci_writel(host, ier, SDHCI_INT_ENABLE);
+	sdhci_writel(host, ier, SDHCI_SIGNAL_ENABLE);
+}
+
 static bool sdhci_do_reset(struct sdhci_host *host, u8 mask)
 {
 	if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
-- 
2.25.1