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Message-Id: <20230915094351.11120-18-victorshihgli@gmail.com>
Date: Fri, 15 Sep 2023 17:43:45 +0800
From: Victor Shih <victorshihgli@...il.com>
To: ulf.hansson@...aro.org, adrian.hunter@...el.com
Cc: linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
benchuanggli@...il.com, HL.Liu@...esyslogic.com.tw,
Greg.tu@...esyslogic.com.tw, takahiro.akashi@...aro.org,
dlunev@...omium.org, Victor Shih <victorshihgli@...il.com>,
Ben Chuang <ben.chuang@...esyslogic.com.tw>,
Victor Shih <victor.shih@...esyslogic.com.tw>
Subject: [PATCH V12 17/23] mmc: sdhci-uhs2: add uhs2_control() to initialise the interface
From: Victor Shih <victor.shih@...esyslogic.com.tw>
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@...esyslogic.com.tw>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
Signed-off-by: Victor Shih <victor.shih@...esyslogic.com.tw>
Acked-by: Adrian Hunter <adrian.hunter@...el.com>
---
Updates in V8:
- Reorder the definitions and lose the parentheses in
sdhci_uhs2_set_config().
- read_poll_timeout() to instead of read_poll_timeout_atomic()
in sdhci_uhs2_check_dormant().
Updates in V7:
- Remove unnecessary function.
Updates in V6:
- Remove unnecessary function.
- Remove unnecessary parameter when call the DBG().
- Cancel export state of some functions.
---
drivers/mmc/host/sdhci-uhs2.c | 88 +++++++++++++++++++++++++++++++++++
1 file changed, 88 insertions(+)
diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
index af1b0c5e48fd..09b86fec9f7b 100644
--- a/drivers/mmc/host/sdhci-uhs2.c
+++ b/drivers/mmc/host/sdhci-uhs2.c
@@ -278,6 +278,48 @@ 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;
+ 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->ios.timing == MMC_TIMING_UHS2_SPEED_B ||
+ host->mmc->ios.timing == MMC_TIMING_UHS2_SPEED_B_HD)
+ 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)
+{
+ int timeout = 100000; /* 100ms */
+ u32 val;
+
+ if (read_poll_timeout(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 *
@@ -359,6 +401,51 @@ 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);
+ struct mmc_ios *ios = &mmc->ios;
+ int err = 0;
+
+ 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_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_SET_IOS:
+ err = sdhci_uhs2_set_ios(mmc, ios);
+ 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 *
@@ -481,6 +568,7 @@ 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_control = sdhci_uhs2_control;
return 0;
}
--
2.25.1
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