[PATCH v2 0/7] RISC-V: Add eMMC support for TH1520 boards

[PATCH v2 0/7] RISC-V: Add eMMC support for TH1520 boards

[Drew Fustini]

This series adds support for the eMMC on the BeagleV Ahead and the
Sipeed LicheePi 4A. This allows the kernel to boot with the rootfs on
eMMC.

I tested on top of v6.6-rc6 with riscv defconfig. I was able to boot
both the Ahead [1] and LPi4a [2] from eMMC. The following prerequisites
are required:

  [PATCH v2] riscv: dts: thead: set dma-noncoherent to soc bus [3]

I pushed a branch [4] with this patch series and the above patch for
those that find a git branch easier to test.

Please note that only the MMC controller connected to the eMMC device
is enabled in the device trees for these two boards. I did not yet
attempt to configure and use the microSD card slot. My preference is to
address that in a future patch series.

References:
[1] https://gist.github.com/pdp7/7850027e8d256b6fd9cd53080240f0f6
[2] https://gist.github.com/pdp7/fae4637378426723508b679420a0a5a1
[3] https://lore.kernel.org/linux-riscv/20230912072232.2455-1-jszhang@kernel.org/
[4] https://github.com/pdp7/linux/tree/b4/th1520-mmc

Changes in PATCH v2:
- make use of BIT(), GENMASK(), FIELD_PREP(), FIELD_GET()
- add EXPORT_SYMBOL_GPL(__sdhci_execute_tuning)
- call th1520_phy_1_8v_init() when FLAG_IO_FIXED_1V8 is set
- set DWCMSHC_CARD_IS_EMMC when mmc caps contains MMC_CAP_NONREMOVABLE
- remove manipulation of AT_CTRL_AT_EN from th1520_set_uhs_signaling()
- remove unneccessary cycle of enabling and disabling AT_CTRL_AT_EN in
  th1520_execute_tuning()
- remove th1520_phy_1_8v_init_no_pull()
- remove th1520_phy_3_3v_init_no_pull()
- remove FLAG_PULL_UP_EN from priv->flags
- remove thead,phy-pull-up device tree property

Changes in PACH v1:
https://lore.kernel.org/all/20230921-th1520-mmc-v1-0-49f76c274fb3@baylibre.com/
- ADMA mode now works correctly due to a patch from Jisheng on the list
  ("riscv: dts: thead: set dma-noncoherent to soc bus") and this commit
  from Icenowy that is now merged: 8eb8fe67e2c8 ("riscv: errata: fix
  T-Head dcache.cva encoding").
- Expose __sdhci_execute_tuning from sdhci.c so that it can be called
  from th1520_execute_tuning()
- Refactor the define macros for all the PHY related registers to make
  it easier to understand the bit fields that the code is manipulating
- Replace magic numbers in the PHY register writes with proper defines 
- Replace non_removable in dwcmshc_priv with check of mmc_host.caps
- Drop dt prop "thead,io-fixed-1v8" and instead check for existing
  properties: "mmc-ddr-1_8v", "mmc-hs200-1_8v", or "mmc-hs400-1_8v"
- Rename dt prop from "thead,pull-up" to "thead,phy-pull-up" and
  improve the description in the dt binding
- Replace pull_up_en in dwcmshc_priv with bit field in new flags field
- Create th1520_set_uhs_signaling() and call dwcmshc_set_uhs_signaling()
  from it instead of adding th1520 code to dwcmshc_set_uhs_signaling()
- Return -EIO instead of -1 upon errors in th1520_execute_tuning()

Changes in RFC v2:
https://lore.kernel.org/linux-riscv/20230724-th1520-emmc-v2-0-132ed2e2171e@baylibre.com/
- Expand dwcmshc_priv based on driver in the T-Head 5.10 kernel:
  delay_line, non_removable, pull_up_en, io_fixed_1v8
- New boolean property "thead,pull-up" indicates phy pull-up config
- New boolean property "thead,io-fixed-1v8" indicates that io voltage
  should be set to 1.8V during reset
- Add th1520_phy_1_8v_init() as voltage_switch op
- Add th1520_execute_tuning() as the platform_execute_tuning op
- Added th1520_sdhci_reset() as the .reset op. This function will set
  io voltage to 1.8V after calling the standard sdhci_reset() function.
- Modified dwcmshc_set_uhs_signaling() to enable SDHCI_CTRL_VDD_180 when
  io_fixed_1v8 is true
- Add many defines for register offsets and settings based on the mmc
  support in the T-Head downstream v5.10 kernel

RFC v1 series:
https://lore.kernel.org/r/20230724-th1520-emmc-v1-0-cca1b2533da2@baylibre.com

Signed-off-by: Drew Fustini <dfustini@baylibre.com>
---
Drew Fustini (7):
      dt-bindings: mmc: sdhci-of-dwcmhsc: Add T-Head TH1520 support
      mmc: sdhci: add __sdhci_execute_tuning() to header
      mmc: sdhci-of-dwcmshc: Add support for T-Head TH1520
      riscv: defconfig: Enable mmc and dma drivers for T-Head TH1520
      riscv: dts: thead: Add TH1520 mmc controller and sdhci clock
      riscv: dts: thead: Enable BeagleV Ahead eMMC controller
      riscv: dts: thead: Enable LicheePi 4A eMMC controller

 .../bindings/mmc/snps,dwcmshc-sdhci.yaml           |   1 +
 arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts |  14 +
 .../boot/dts/thead/th1520-lichee-module-4a.dtsi    |  14 +
 arch/riscv/boot/dts/thead/th1520.dtsi              |  15 +
 arch/riscv/configs/defconfig                       |   2 +
 drivers/mmc/host/sdhci-of-dwcmshc.c                | 358 +++++++++++++++++++++
 drivers/mmc/host/sdhci.c                           |   3 +-
 drivers/mmc/host/sdhci.h                           |   1 +
 8 files changed, 407 insertions(+), 1 deletion(-)
---
base-commit: f4c03b3d6c4bdafbb7885ccb84b095001eab1b88
change-id: 20231017-th1520-mmc-b7c72b7f56cd

Best regards,
-- 
Drew Fustini <dfustini@baylibre.com>


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[PATCH v2 1/7] dt-bindings: mmc: sdhci-of-dwcmhsc: Add T-Head TH1520 support

[Drew Fustini]

Add compatible value for the T-Head TH1520 dwcmshc controller.

Signed-off-by: Drew Fustini <dfustini@baylibre.com>
---
 Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml b/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml
index a43eb837f8da..42804d955293 100644
--- a/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml
+++ b/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml
@@ -19,6 +19,7 @@ properties:
       - rockchip,rk3568-dwcmshc
       - rockchip,rk3588-dwcmshc
       - snps,dwcmshc-sdhci
+      - thead,th1520-dwcmshc
 
   reg:
     maxItems: 1

-- 
2.34.1


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Re: [PATCH v2 1/7] dt-bindings: mmc: sdhci-of-dwcmhsc: Add T-Head TH1520 support

[Krzysztof Kozlowski]

On 17/10/2023 22:43, Drew Fustini wrote:
> Add compatible value for the T-Head TH1520 dwcmshc controller.
> 
> Signed-off-by: Drew Fustini <dfustini@baylibre.com>
> ---

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Best regards,
Krzysztof


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Re: [PATCH v2 1/7] dt-bindings: mmc: sdhci-of-dwcmhsc: Add T-Head TH1520 support

[Guo Ren]

On Wed, Oct 18, 2023 at 4:45 AM Drew Fustini <dfustini@baylibre.com> wrote:
>
> Add compatible value for the T-Head TH1520 dwcmshc controller.
>
> Signed-off-by: Drew Fustini <dfustini@baylibre.com>
> ---
>  Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml b/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml
> index a43eb837f8da..42804d955293 100644
> --- a/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml
> +++ b/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml
> @@ -19,6 +19,7 @@ properties:
>        - rockchip,rk3568-dwcmshc
>        - rockchip,rk3588-dwcmshc
>        - snps,dwcmshc-sdhci
> +      - thead,th1520-dwcmshc
Acked-by: Guo Ren <guoren@kernel.org>

>
>    reg:
>      maxItems: 1
>
> --
> 2.34.1
>


-- 
Best Regards
 Guo Ren

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[PATCH v2 2/7] mmc: sdhci: add __sdhci_execute_tuning() to header

[Drew Fustini]

Expose __sdhci_execute_tuning() so that it can be called from the
mmc host controller drivers.

In the sdhci-of-dwcmshc driver, sdhci_dwcmshc_th1520_ops sets
platform_execute_tuning to th1520_execute_tuning(). That function has
to manipulate phy registers before tuning can be performed. To avoid
copying the code verbatim from __sdhci_execute_tuning() into
th1520_execute_tuning(), make it possible for __sdhci_execute_tuning()
to be called from sdhci-of-dwcmshc.

Signed-off-by: Drew Fustini <dfustini@baylibre.com>
---
 drivers/mmc/host/sdhci.c | 3 ++-
 drivers/mmc/host/sdhci.h | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index ff41aa56564e..c79f73459915 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2841,7 +2841,7 @@ void sdhci_send_tuning(struct sdhci_host *host, u32 opcode)
 }
 EXPORT_SYMBOL_GPL(sdhci_send_tuning);
 
-static int __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode)
+int __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode)
 {
 	int i;
 
@@ -2879,6 +2879,7 @@ static int __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode)
 	sdhci_reset_tuning(host);
 	return -EAGAIN;
 }
+EXPORT_SYMBOL_GPL(__sdhci_execute_tuning);
 
 int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
 {
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index f219bdea8f28..a20864fc0641 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -793,6 +793,7 @@ void sdhci_set_bus_width(struct sdhci_host *host, int width);
 void sdhci_reset(struct sdhci_host *host, u8 mask);
 void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing);
 int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode);
+int __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode);
 void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios);
 int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
 				      struct mmc_ios *ios);

-- 
2.34.1


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[PATCH v2 3/7] mmc: sdhci-of-dwcmshc: Add support for T-Head TH1520

[Drew Fustini]

Add support for the mmc controller in the T-Head TH1520 with the new
compatible "thead,th1520-dwcmshc". Implement custom sdhci_ops for
set_uhs_signaling, reset, voltage_switch, and platform_execute_tuning.

Signed-off-by: Drew Fustini <dfustini@baylibre.com>
---
 drivers/mmc/host/sdhci-of-dwcmshc.c | 358 ++++++++++++++++++++++++++++++++++++
 1 file changed, 358 insertions(+)

diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
index 3a3bae6948a8..88ed0937c4e9 100644
--- a/drivers/mmc/host/sdhci-of-dwcmshc.c
+++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
@@ -8,6 +8,7 @@
  */
 
 #include <linux/acpi.h>
+#include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/dma-mapping.h>
 #include <linux/iopoll.h>
@@ -35,6 +36,21 @@
 #define DWCMSHC_CARD_IS_EMMC		BIT(0)
 #define DWCMSHC_ENHANCED_STROBE		BIT(8)
 #define DWCMSHC_EMMC_ATCTRL		0x40
+/* Tuning and auto-tuning fields in AT_CTRL_R control register */
+#define AT_CTRL_AT_EN			BIT(0) /* autotuning is enabled */
+#define AT_CTRL_CI_SEL			BIT(1) /* interval to drive center phase select */
+#define AT_CTRL_SWIN_TH_EN		BIT(2) /* sampling window threshold enable */
+#define AT_CTRL_RPT_TUNE_ERR		BIT(3) /* enable reporting framing errors */
+#define AT_CTRL_SW_TUNE_EN		BIT(4) /* enable software managed tuning */
+#define AT_CTRL_WIN_EDGE_SEL_MASK	GENMASK(11, 8) /* bits [11:8] */
+#define AT_CTRL_WIN_EDGE_SEL		0xf /* sampling window edge select */
+#define AT_CTRL_TUNE_CLK_STOP_EN	BIT(16) /* clocks stopped during phase code change */
+#define AT_CTRL_PRE_CHANGE_DLY_MASK	GENMASK(18, 17) /* bits [18:17] */
+#define AT_CTRL_PRE_CHANGE_DLY		0x1  /* 2-cycle latency */
+#define AT_CTRL_POST_CHANGE_DLY_MASK	GENMASK(20, 19) /* bits [20:19] */
+#define AT_CTRL_POST_CHANGE_DLY		0x3  /* 4-cycle latency */
+#define AT_CTRL_SWIN_TH_VAL_MASK	GENMASK(31, 24) /* bits [31:24] */
+#define AT_CTRL_SWIN_TH_VAL		0x9  /* sampling window threshold */
 
 /* Rockchip specific Registers */
 #define DWCMSHC_EMMC_DLL_CTRL		0x800
@@ -72,6 +88,82 @@
 	(((x) & DWCMSHC_EMMC_DLL_TIMEOUT) == 0))
 #define RK35xx_MAX_CLKS 3
 
+/* PHY register area pointer */
+#define DWC_MSHC_PTR_PHY_R	0x300
+
+/* PHY general configuration */
+#define PHY_CNFG_R		(DWC_MSHC_PTR_PHY_R + 0x00)
+#define PHY_CNFG_RSTN_DEASSERT	0x1  /* Deassert PHY reset */
+#define PHY_CNFG_PAD_SP_MASK	GENMASK(19, 16) /* bits [19:16] */
+#define PHY_CNFG_PAD_SP		0x0c /* PMOS TX drive strength */
+#define PHY_CNFG_PAD_SN_MASK	GENMASK(23, 20) /* bits [23:20] */
+#define PHY_CNFG_PAD_SN		0x0c /* NMOS TX drive strength */
+
+/* PHY command/response pad settings */
+#define PHY_CMDPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x04)
+
+/* PHY data pad settings */
+#define PHY_DATAPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x06)
+
+/* PHY clock pad settings */
+#define PHY_CLKPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x08)
+
+/* PHY strobe pad settings */
+#define PHY_STBPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x0a)
+
+/* PHY reset pad settings */
+#define PHY_RSTNPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x0c)
+
+/* Bitfields are common for all pad settings */
+#define PHY_PAD_RXSEL_1V8		0x1 /* Receiver type select for 1.8V */
+#define PHY_PAD_RXSEL_3V3		0x2 /* Receiver type select for 3.3V */
+
+#define PHY_PAD_WEAKPULL_MASK		GENMASK(4, 3) /* bits [4:3] */
+#define PHY_PAD_WEAKPULL_PULLUP		0x1 /* Weak pull down enabled */
+#define PHY_PAD_WEAKPULL_PULLDOWN	0x2 /* Weak pull down enabled */
+
+#define PHY_PAD_TXSLEW_CTRL_P_MASK	GENMASK(8, 5) /* bits [8:5] */
+#define PHY_PAD_TXSLEW_CTRL_P		0x3 /* Slew control for P-Type pad TX */
+#define PHY_PAD_TXSLEW_CTRL_N_MASK	GENMASK(12, 9) /* bits [12:9] */
+#define PHY_PAD_TXSLEW_CTRL_N		0x3 /* Slew control for N-Type pad TX */
+
+/* PHY CLK delay line settings */
+#define PHY_SDCLKDL_CNFG_R		(DWC_MSHC_PTR_PHY_R + 0x1d)
+#define PHY_SDCLKDL_CNFG_UPDATE	BIT(4) /* set before writing to SDCLKDL_DC */
+
+/* PHY CLK delay line delay code */
+#define PHY_SDCLKDL_DC_R		(DWC_MSHC_PTR_PHY_R + 0x1e)
+#define PHY_SDCLKDL_DC_INITIAL		0x40 /* initial delay code */
+#define PHY_SDCLKDL_DC_DEFAULT		0x32 /* default delay code */
+#define PHY_SDCLKDL_DC_HS400		0x18 /* delay code for HS400 mode */
+
+/* PHY drift_cclk_rx delay line configuration setting */
+#define PHY_ATDL_CNFG_R			(DWC_MSHC_PTR_PHY_R + 0x21)
+#define PHY_ATDL_CNFG_INPSEL_MASK	GENMASK(3, 2) /* bits [3:2] */
+#define PHY_ATDL_CNFG_INPSEL		0x3 /* delay line input source */
+
+/* PHY DLL control settings */
+#define PHY_DLL_CTRL_R			(DWC_MSHC_PTR_PHY_R + 0x24)
+#define PHY_DLL_CTRL_DISABLE		0x0 /* PHY DLL is enabled */
+#define PHY_DLL_CTRL_ENABLE		0x1 /* PHY DLL is disabled */
+
+/* PHY DLL  configuration register 1 */
+#define PHY_DLL_CNFG1_R			(DWC_MSHC_PTR_PHY_R + 0x25)
+#define PHY_DLL_CNFG1_SLVDLY_MASK	GENMASK(5, 4) /* bits [5:4] */
+#define PHY_DLL_CNFG1_SLVDLY		0x2 /* DLL slave update delay input */
+#define PHY_DLL_CNFG1_WAITCYCLE		0x5 /* DLL wait cycle input */
+
+/* PHY DLL configuration register 2 */
+#define PHY_DLL_CNFG2_R			(DWC_MSHC_PTR_PHY_R + 0x26)
+#define PHY_DLL_CNFG2_JUMPSTEP		0xa /* DLL jump step input */
+
+/* PHY DLL master and slave delay line configuration settings */
+#define PHY_DLLDL_CNFG_R		(DWC_MSHC_PTR_PHY_R + 0x28)
+#define PHY_DLLDL_CNFG_SLV_INPSEL_MASK	GENMASK(6, 5) /* bits [6:5] */
+#define PHY_DLLDL_CNFG_SLV_INPSEL	0x3 /* clock source select for slave DL */
+
+#define FLAG_IO_FIXED_1V8	BIT(0)
+
 #define BOUNDARY_OK(addr, len) \
 	((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1)))
 
@@ -92,6 +184,8 @@ struct dwcmshc_priv {
 	struct clk	*bus_clk;
 	int vendor_specific_area1; /* P_VENDOR_SPECIFIC_AREA reg */
 	void *priv; /* pointer to SoC private stuff */
+	u16 delay_line;
+	u16 flags;
 };
 
 /*
@@ -157,6 +251,129 @@ static void dwcmshc_request(struct mmc_host *mmc, struct mmc_request *mrq)
 	sdhci_request(mmc, mrq);
 }
 
+static void th1520_phy_1_8v_init(struct sdhci_host *host)
+{
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
+	u32 val;
+
+	if (!priv)
+		return;
+
+	/* deassert phy reset & set tx drive strength */
+	val = PHY_CNFG_RSTN_DEASSERT;
+	val |= FIELD_PREP(PHY_CNFG_PAD_SP_MASK, PHY_CNFG_PAD_SP);
+	val |= FIELD_PREP(PHY_CNFG_PAD_SN_MASK, PHY_CNFG_PAD_SN);
+	sdhci_writel(host, val, PHY_CNFG_R);
+
+	/* disable delay line */
+	sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE, PHY_SDCLKDL_CNFG_R);
+
+	/* set delay line */
+	sdhci_writeb(host, priv->delay_line, PHY_SDCLKDL_DC_R);
+	sdhci_writeb(host, PHY_DLL_CNFG2_JUMPSTEP, PHY_DLL_CNFG2_R);
+
+	/* enable delay lane */
+	val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R);
+	val &= ~(PHY_SDCLKDL_CNFG_UPDATE);
+	sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R);
+
+	/* configure phy pads */
+	val = PHY_PAD_RXSEL_1V8;
+	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLUP);
+	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
+	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
+	sdhci_writew(host, val, PHY_CMDPAD_CNFG_R);
+	sdhci_writew(host, val, PHY_DATAPAD_CNFG_R);
+	sdhci_writew(host, val, PHY_RSTNPAD_CNFG_R);
+
+	val = FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
+	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
+	sdhci_writew(host, val, PHY_CLKPAD_CNFG_R);
+
+	val = PHY_PAD_RXSEL_1V8;
+	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLDOWN);
+	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
+	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
+	sdhci_writew(host, val, PHY_STBPAD_CNFG_R);
+
+	/* enable data strobe mode */
+	sdhci_writeb(host, FIELD_PREP(PHY_DLLDL_CNFG_SLV_INPSEL_MASK, PHY_DLLDL_CNFG_SLV_INPSEL),
+		     PHY_DLLDL_CNFG_R);
+
+	/* enable phy dll */
+	sdhci_writeb(host, PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R);
+}
+
+static void th1520_phy_3_3v_init(struct sdhci_host *host)
+{
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
+	u32 val;
+
+	/* deassert phy reset & set tx drive strength */
+	val = PHY_CNFG_RSTN_DEASSERT;
+	val |= FIELD_PREP(PHY_CNFG_PAD_SP_MASK, PHY_CNFG_PAD_SP);
+	val |= FIELD_PREP(PHY_CNFG_PAD_SN_MASK, PHY_CNFG_PAD_SN);
+	sdhci_writel(host, val, PHY_CNFG_R);
+
+	/* disable delay line */
+	sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE, PHY_SDCLKDL_CNFG_R);
+
+	/* set delay line */
+	sdhci_writeb(host, priv->delay_line, PHY_SDCLKDL_DC_R);
+	sdhci_writeb(host, PHY_DLL_CNFG2_JUMPSTEP, PHY_DLL_CNFG2_R);
+
+	/* enable delay lane */
+	val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R);
+	val &= ~(PHY_SDCLKDL_CNFG_UPDATE);
+	sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R);
+
+	/* configure phy pads */
+	val = PHY_PAD_RXSEL_3V3;
+	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLUP);
+	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
+	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
+	sdhci_writew(host, val, PHY_CMDPAD_CNFG_R);
+	sdhci_writew(host, val, PHY_DATAPAD_CNFG_R);
+	sdhci_writew(host, val, PHY_RSTNPAD_CNFG_R);
+
+	val = FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
+	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
+	sdhci_writew(host, val, PHY_CLKPAD_CNFG_R);
+
+	val = PHY_PAD_RXSEL_3V3;
+	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLDOWN);
+	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
+	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
+	sdhci_writew(host, val, PHY_STBPAD_CNFG_R);
+
+	/* enable phy dll */
+	sdhci_writeb(host, PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R);
+}
+
+static void th1520_sdhci_set_phy(struct sdhci_host *host)
+{
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
+	u16 emmc_ctrl;
+
+	/* Before power on, set PHY configs */
+	if (priv->flags & FLAG_IO_FIXED_1V8)
+		th1520_phy_1_8v_init(host);
+	else
+		th1520_phy_3_3v_init(host);
+
+	if (host->mmc->caps & MMC_CAP_NONREMOVABLE) {
+		emmc_ctrl = sdhci_readw(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_CONTROL);
+		emmc_ctrl |= DWCMSHC_CARD_IS_EMMC;
+		sdhci_writew(host, emmc_ctrl, priv->vendor_specific_area1 + DWCMSHC_EMMC_CONTROL);
+	}
+
+	sdhci_writeb(host, FIELD_PREP(PHY_DLL_CNFG1_SLVDLY_MASK, PHY_DLL_CNFG1_SLVDLY) |
+		     PHY_DLL_CNFG1_WAITCYCLE, PHY_DLL_CNFG1_R);
+}
+
 static void dwcmshc_set_uhs_signaling(struct sdhci_host *host,
 				      unsigned int timing)
 {
@@ -189,9 +406,26 @@ static void dwcmshc_set_uhs_signaling(struct sdhci_host *host,
 		ctrl_2 |= DWCMSHC_CTRL_HS400;
 	}
 
+	if (priv->flags & FLAG_IO_FIXED_1V8)
+		ctrl_2 |= SDHCI_CTRL_VDD_180;
 	sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
 }
 
+static void th1520_set_uhs_signaling(struct sdhci_host *host,
+				     unsigned int timing)
+{
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
+
+	dwcmshc_set_uhs_signaling(host, timing);
+	if (timing == MMC_TIMING_MMC_HS400) {
+		priv->delay_line = PHY_SDCLKDL_DC_HS400;
+		th1520_sdhci_set_phy(host);
+	} else {
+		sdhci_writeb(host, 0, PHY_DLLDL_CNFG_R);
+	}
+}
+
 static void dwcmshc_hs400_enhanced_strobe(struct mmc_host *mmc,
 					  struct mmc_ios *ios)
 {
@@ -338,6 +572,85 @@ static void rk35xx_sdhci_reset(struct sdhci_host *host, u8 mask)
 	sdhci_reset(host, mask);
 }
 
+static int th1520_execute_tuning(struct sdhci_host *host, u32 opcode)
+{
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
+	u32 val = 0;
+
+	if (host->flags & SDHCI_HS400_TUNING)
+		return 0;
+
+	sdhci_writeb(host, FIELD_PREP(PHY_ATDL_CNFG_INPSEL_MASK, PHY_ATDL_CNFG_INPSEL),
+		     PHY_ATDL_CNFG_R);
+	val = sdhci_readl(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL);
+
+	/*
+	 * configure tuning settings:
+	 *  - center phase select code driven in block gap interval
+	 *  - disable reporting of framing errors
+	 *  - disable software managed tuning
+	 *  - disable user selection of sampling window edges,
+	 *    instead tuning calculated edges are used
+	 */
+	val &= ~(AT_CTRL_CI_SEL | AT_CTRL_RPT_TUNE_ERR | AT_CTRL_SW_TUNE_EN |
+		 FIELD_PREP(AT_CTRL_WIN_EDGE_SEL_MASK, AT_CTRL_WIN_EDGE_SEL));
+
+	/*
+	 * configure tuning settings:
+	 *  - enable auto-tuning
+	 *  - enable sampling window threshold
+	 *  - stop clocks during phase code change
+	 *  - set max latency in cycles between tx and rx clocks
+	 *  - set max latency in cycles to switch output phase
+	 *  - set max sampling window threshold value
+	 */
+	val |= AT_CTRL_AT_EN | AT_CTRL_SWIN_TH_EN | AT_CTRL_TUNE_CLK_STOP_EN;
+	val |= FIELD_PREP(AT_CTRL_PRE_CHANGE_DLY_MASK, AT_CTRL_PRE_CHANGE_DLY);
+	val |= FIELD_PREP(AT_CTRL_POST_CHANGE_DLY_MASK, AT_CTRL_POST_CHANGE_DLY);
+	val |= FIELD_PREP(AT_CTRL_SWIN_TH_VAL_MASK, AT_CTRL_SWIN_TH_VAL);
+
+	sdhci_writel(host, val, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL);
+	val = sdhci_readl(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL);
+
+	/* check if is possible to enable auto-tuning */
+	if (!(val & AT_CTRL_AT_EN)) {
+		dev_err(mmc_dev(host->mmc), "failed to enable auto tuning\n");
+		return -EIO;
+	}
+
+	/* perform tuning */
+	sdhci_start_tuning(host);
+	host->tuning_err = __sdhci_execute_tuning(host, opcode);
+	if (host->tuning_err) {
+		/* disable auto-tuning upon tuning error */
+		val &= ~AT_CTRL_AT_EN;
+		sdhci_writel(host, val, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL);
+		dev_err(mmc_dev(host->mmc), "tuning failed: %d\n", host->tuning_err);
+		return -EIO;
+	}
+	sdhci_end_tuning(host);
+
+	return 0;
+}
+
+static void th1520_sdhci_reset(struct sdhci_host *host, u8 mask)
+{
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
+	u16 ctrl_2;
+
+	sdhci_reset(host, mask);
+
+	if (priv->flags & FLAG_IO_FIXED_1V8) {
+		ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+		if (!(ctrl_2 & SDHCI_CTRL_VDD_180)) {
+			ctrl_2 |= SDHCI_CTRL_VDD_180;
+			sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
+		}
+	}
+}
+
 static const struct sdhci_ops sdhci_dwcmshc_ops = {
 	.set_clock		= sdhci_set_clock,
 	.set_bus_width		= sdhci_set_bus_width,
@@ -356,6 +669,17 @@ static const struct sdhci_ops sdhci_dwcmshc_rk35xx_ops = {
 	.adma_write_desc	= dwcmshc_adma_write_desc,
 };
 
+static const struct sdhci_ops sdhci_dwcmshc_th1520_ops = {
+	.set_clock		= sdhci_set_clock,
+	.set_bus_width		= sdhci_set_bus_width,
+	.set_uhs_signaling	= th1520_set_uhs_signaling,
+	.get_max_clock		= dwcmshc_get_max_clock,
+	.reset			= th1520_sdhci_reset,
+	.adma_write_desc	= dwcmshc_adma_write_desc,
+	.voltage_switch		= th1520_phy_1_8v_init,
+	.platform_execute_tuning = &th1520_execute_tuning,
+};
+
 static const struct sdhci_pltfm_data sdhci_dwcmshc_pdata = {
 	.ops = &sdhci_dwcmshc_ops,
 	.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
@@ -379,6 +703,12 @@ static const struct sdhci_pltfm_data sdhci_dwcmshc_rk35xx_pdata = {
 		   SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
 };
 
+static const struct sdhci_pltfm_data sdhci_dwcmshc_th1520_pdata = {
+	.ops = &sdhci_dwcmshc_th1520_ops,
+	.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
+	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
+};
+
 static int dwcmshc_rk35xx_init(struct sdhci_host *host, struct dwcmshc_priv *dwc_priv)
 {
 	int err;
@@ -447,6 +777,10 @@ static const struct of_device_id sdhci_dwcmshc_dt_ids[] = {
 		.compatible = "snps,dwcmshc-sdhci",
 		.data = &sdhci_dwcmshc_pdata,
 	},
+	{
+		.compatible = "thead,th1520-dwcmshc",
+		.data = &sdhci_dwcmshc_th1520_pdata,
+	},
 	{},
 };
 MODULE_DEVICE_TABLE(of, sdhci_dwcmshc_dt_ids);
@@ -542,6 +876,30 @@ static int dwcmshc_probe(struct platform_device *pdev)
 			goto err_clk;
 	}
 
+	if (pltfm_data == &sdhci_dwcmshc_th1520_pdata) {
+		priv->delay_line = PHY_SDCLKDL_DC_DEFAULT;
+
+		if ((device_property_read_bool(dev, "mmc-ddr-1_8v")) |
+		    (device_property_read_bool(dev, "mmc-hs200-1_8v")) |
+		    (device_property_read_bool(dev, "mmc-hs400-1_8v")))
+			priv->flags |= FLAG_IO_FIXED_1V8;
+		else
+			priv->flags &= ~FLAG_IO_FIXED_1V8;
+
+		/*
+		 * start_signal_voltage_switch() will try 3.3V first
+		 * then 1.8V. Use SDHCI_SIGNALING_180 ranther than
+		 * SDHCI_SIGNALING_330 to avoid setting voltage to 3.3V
+		 * in sdhci_start_signal_voltage_switch().
+		 */
+		if (priv->flags & FLAG_IO_FIXED_1V8) {
+			host->flags &= ~SDHCI_SIGNALING_330;
+			host->flags |=  SDHCI_SIGNALING_180;
+		}
+
+		sdhci_enable_v4_mode(host);
+	}
+
 #ifdef CONFIG_ACPI
 	if (pltfm_data == &sdhci_dwcmshc_bf3_pdata)
 		sdhci_enable_v4_mode(host);

-- 
2.34.1


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Re: [PATCH v2 3/7] mmc: sdhci-of-dwcmshc: Add support for T-Head TH1520

[Jisheng Zhang]

On Tue, Oct 17, 2023 at 01:43:49PM -0700, Drew Fustini wrote:
> Add support for the mmc controller in the T-Head TH1520 with the new
> compatible "thead,th1520-dwcmshc". Implement custom sdhci_ops for
> set_uhs_signaling, reset, voltage_switch, and platform_execute_tuning.
> 
> Signed-off-by: Drew Fustini <dfustini@baylibre.com>
> ---
>  drivers/mmc/host/sdhci-of-dwcmshc.c | 358 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 358 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
> index 3a3bae6948a8..88ed0937c4e9 100644
> --- a/drivers/mmc/host/sdhci-of-dwcmshc.c
> +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
> @@ -8,6 +8,7 @@
>   */
>  
>  #include <linux/acpi.h>
> +#include <linux/bitfield.h>
>  #include <linux/clk.h>
>  #include <linux/dma-mapping.h>
>  #include <linux/iopoll.h>
> @@ -35,6 +36,21 @@
>  #define DWCMSHC_CARD_IS_EMMC		BIT(0)
>  #define DWCMSHC_ENHANCED_STROBE		BIT(8)
>  #define DWCMSHC_EMMC_ATCTRL		0x40
> +/* Tuning and auto-tuning fields in AT_CTRL_R control register */
> +#define AT_CTRL_AT_EN			BIT(0) /* autotuning is enabled */
> +#define AT_CTRL_CI_SEL			BIT(1) /* interval to drive center phase select */
> +#define AT_CTRL_SWIN_TH_EN		BIT(2) /* sampling window threshold enable */
> +#define AT_CTRL_RPT_TUNE_ERR		BIT(3) /* enable reporting framing errors */
> +#define AT_CTRL_SW_TUNE_EN		BIT(4) /* enable software managed tuning */
> +#define AT_CTRL_WIN_EDGE_SEL_MASK	GENMASK(11, 8) /* bits [11:8] */
> +#define AT_CTRL_WIN_EDGE_SEL		0xf /* sampling window edge select */
> +#define AT_CTRL_TUNE_CLK_STOP_EN	BIT(16) /* clocks stopped during phase code change */
> +#define AT_CTRL_PRE_CHANGE_DLY_MASK	GENMASK(18, 17) /* bits [18:17] */
> +#define AT_CTRL_PRE_CHANGE_DLY		0x1  /* 2-cycle latency */
> +#define AT_CTRL_POST_CHANGE_DLY_MASK	GENMASK(20, 19) /* bits [20:19] */
> +#define AT_CTRL_POST_CHANGE_DLY		0x3  /* 4-cycle latency */
> +#define AT_CTRL_SWIN_TH_VAL_MASK	GENMASK(31, 24) /* bits [31:24] */
> +#define AT_CTRL_SWIN_TH_VAL		0x9  /* sampling window threshold */
>  
>  /* Rockchip specific Registers */
>  #define DWCMSHC_EMMC_DLL_CTRL		0x800
> @@ -72,6 +88,82 @@
>  	(((x) & DWCMSHC_EMMC_DLL_TIMEOUT) == 0))
>  #define RK35xx_MAX_CLKS 3
>  
> +/* PHY register area pointer */
> +#define DWC_MSHC_PTR_PHY_R	0x300
> +
> +/* PHY general configuration */
> +#define PHY_CNFG_R		(DWC_MSHC_PTR_PHY_R + 0x00)
> +#define PHY_CNFG_RSTN_DEASSERT	0x1  /* Deassert PHY reset */
> +#define PHY_CNFG_PAD_SP_MASK	GENMASK(19, 16) /* bits [19:16] */
> +#define PHY_CNFG_PAD_SP		0x0c /* PMOS TX drive strength */
> +#define PHY_CNFG_PAD_SN_MASK	GENMASK(23, 20) /* bits [23:20] */
> +#define PHY_CNFG_PAD_SN		0x0c /* NMOS TX drive strength */
> +
> +/* PHY command/response pad settings */
> +#define PHY_CMDPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x04)
> +
> +/* PHY data pad settings */
> +#define PHY_DATAPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x06)
> +
> +/* PHY clock pad settings */
> +#define PHY_CLKPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x08)
> +
> +/* PHY strobe pad settings */
> +#define PHY_STBPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x0a)
> +
> +/* PHY reset pad settings */
> +#define PHY_RSTNPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x0c)
> +
> +/* Bitfields are common for all pad settings */
> +#define PHY_PAD_RXSEL_1V8		0x1 /* Receiver type select for 1.8V */
> +#define PHY_PAD_RXSEL_3V3		0x2 /* Receiver type select for 3.3V */
> +
> +#define PHY_PAD_WEAKPULL_MASK		GENMASK(4, 3) /* bits [4:3] */
> +#define PHY_PAD_WEAKPULL_PULLUP		0x1 /* Weak pull down enabled */
> +#define PHY_PAD_WEAKPULL_PULLDOWN	0x2 /* Weak pull down enabled */
> +
> +#define PHY_PAD_TXSLEW_CTRL_P_MASK	GENMASK(8, 5) /* bits [8:5] */
> +#define PHY_PAD_TXSLEW_CTRL_P		0x3 /* Slew control for P-Type pad TX */
> +#define PHY_PAD_TXSLEW_CTRL_N_MASK	GENMASK(12, 9) /* bits [12:9] */
> +#define PHY_PAD_TXSLEW_CTRL_N		0x3 /* Slew control for N-Type pad TX */
> +
> +/* PHY CLK delay line settings */
> +#define PHY_SDCLKDL_CNFG_R		(DWC_MSHC_PTR_PHY_R + 0x1d)
> +#define PHY_SDCLKDL_CNFG_UPDATE	BIT(4) /* set before writing to SDCLKDL_DC */
> +
> +/* PHY CLK delay line delay code */
> +#define PHY_SDCLKDL_DC_R		(DWC_MSHC_PTR_PHY_R + 0x1e)
> +#define PHY_SDCLKDL_DC_INITIAL		0x40 /* initial delay code */
> +#define PHY_SDCLKDL_DC_DEFAULT		0x32 /* default delay code */
> +#define PHY_SDCLKDL_DC_HS400		0x18 /* delay code for HS400 mode */
> +
> +/* PHY drift_cclk_rx delay line configuration setting */
> +#define PHY_ATDL_CNFG_R			(DWC_MSHC_PTR_PHY_R + 0x21)
> +#define PHY_ATDL_CNFG_INPSEL_MASK	GENMASK(3, 2) /* bits [3:2] */
> +#define PHY_ATDL_CNFG_INPSEL		0x3 /* delay line input source */
> +
> +/* PHY DLL control settings */
> +#define PHY_DLL_CTRL_R			(DWC_MSHC_PTR_PHY_R + 0x24)
> +#define PHY_DLL_CTRL_DISABLE		0x0 /* PHY DLL is enabled */
> +#define PHY_DLL_CTRL_ENABLE		0x1 /* PHY DLL is disabled */
> +
> +/* PHY DLL  configuration register 1 */
> +#define PHY_DLL_CNFG1_R			(DWC_MSHC_PTR_PHY_R + 0x25)
> +#define PHY_DLL_CNFG1_SLVDLY_MASK	GENMASK(5, 4) /* bits [5:4] */
> +#define PHY_DLL_CNFG1_SLVDLY		0x2 /* DLL slave update delay input */
> +#define PHY_DLL_CNFG1_WAITCYCLE		0x5 /* DLL wait cycle input */
> +
> +/* PHY DLL configuration register 2 */
> +#define PHY_DLL_CNFG2_R			(DWC_MSHC_PTR_PHY_R + 0x26)
> +#define PHY_DLL_CNFG2_JUMPSTEP		0xa /* DLL jump step input */
> +
> +/* PHY DLL master and slave delay line configuration settings */
> +#define PHY_DLLDL_CNFG_R		(DWC_MSHC_PTR_PHY_R + 0x28)
> +#define PHY_DLLDL_CNFG_SLV_INPSEL_MASK	GENMASK(6, 5) /* bits [6:5] */
> +#define PHY_DLLDL_CNFG_SLV_INPSEL	0x3 /* clock source select for slave DL */
> +
> +#define FLAG_IO_FIXED_1V8	BIT(0)
> +
>  #define BOUNDARY_OK(addr, len) \
>  	((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1)))
>  
> @@ -92,6 +184,8 @@ struct dwcmshc_priv {
>  	struct clk	*bus_clk;
>  	int vendor_specific_area1; /* P_VENDOR_SPECIFIC_AREA reg */
>  	void *priv; /* pointer to SoC private stuff */
> +	u16 delay_line;
> +	u16 flags;
>  };
>  
>  /*
> @@ -157,6 +251,129 @@ static void dwcmshc_request(struct mmc_host *mmc, struct mmc_request *mrq)
>  	sdhci_request(mmc, mrq);
>  }
>  
> +static void th1520_phy_1_8v_init(struct sdhci_host *host)
> +{
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> +	u32 val;
> +
> +	if (!priv)
> +		return;

this is impossible, can be removed.

> +
> +	/* deassert phy reset & set tx drive strength */
> +	val = PHY_CNFG_RSTN_DEASSERT;
> +	val |= FIELD_PREP(PHY_CNFG_PAD_SP_MASK, PHY_CNFG_PAD_SP);
> +	val |= FIELD_PREP(PHY_CNFG_PAD_SN_MASK, PHY_CNFG_PAD_SN);
> +	sdhci_writel(host, val, PHY_CNFG_R);
> +
> +	/* disable delay line */
> +	sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE, PHY_SDCLKDL_CNFG_R);
> +
> +	/* set delay line */
> +	sdhci_writeb(host, priv->delay_line, PHY_SDCLKDL_DC_R);
> +	sdhci_writeb(host, PHY_DLL_CNFG2_JUMPSTEP, PHY_DLL_CNFG2_R);
> +
> +	/* enable delay lane */
> +	val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R);
> +	val &= ~(PHY_SDCLKDL_CNFG_UPDATE);
> +	sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R);
> +
> +	/* configure phy pads */
> +	val = PHY_PAD_RXSEL_1V8;
> +	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLUP);
> +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> +	sdhci_writew(host, val, PHY_CMDPAD_CNFG_R);
> +	sdhci_writew(host, val, PHY_DATAPAD_CNFG_R);
> +	sdhci_writew(host, val, PHY_RSTNPAD_CNFG_R);
> +
> +	val = FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> +	sdhci_writew(host, val, PHY_CLKPAD_CNFG_R);
> +
> +	val = PHY_PAD_RXSEL_1V8;
> +	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLDOWN);
> +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> +	sdhci_writew(host, val, PHY_STBPAD_CNFG_R);
> +
> +	/* enable data strobe mode */
> +	sdhci_writeb(host, FIELD_PREP(PHY_DLLDL_CNFG_SLV_INPSEL_MASK, PHY_DLLDL_CNFG_SLV_INPSEL),
> +		     PHY_DLLDL_CNFG_R);
> +
> +	/* enable phy dll */
> +	sdhci_writeb(host, PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R);
> +}
> +
> +static void th1520_phy_3_3v_init(struct sdhci_host *host)
> +{
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> +	u32 val;
> +
> +	/* deassert phy reset & set tx drive strength */
> +	val = PHY_CNFG_RSTN_DEASSERT;
> +	val |= FIELD_PREP(PHY_CNFG_PAD_SP_MASK, PHY_CNFG_PAD_SP);
> +	val |= FIELD_PREP(PHY_CNFG_PAD_SN_MASK, PHY_CNFG_PAD_SN);
> +	sdhci_writel(host, val, PHY_CNFG_R);
> +
> +	/* disable delay line */
> +	sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE, PHY_SDCLKDL_CNFG_R);
> +
> +	/* set delay line */
> +	sdhci_writeb(host, priv->delay_line, PHY_SDCLKDL_DC_R);
> +	sdhci_writeb(host, PHY_DLL_CNFG2_JUMPSTEP, PHY_DLL_CNFG2_R);
> +
> +	/* enable delay lane */
> +	val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R);
> +	val &= ~(PHY_SDCLKDL_CNFG_UPDATE);
> +	sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R);
> +
> +	/* configure phy pads */
> +	val = PHY_PAD_RXSEL_3V3;
> +	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLUP);
> +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> +	sdhci_writew(host, val, PHY_CMDPAD_CNFG_R);
> +	sdhci_writew(host, val, PHY_DATAPAD_CNFG_R);
> +	sdhci_writew(host, val, PHY_RSTNPAD_CNFG_R);
> +
> +	val = FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> +	sdhci_writew(host, val, PHY_CLKPAD_CNFG_R);
> +
> +	val = PHY_PAD_RXSEL_3V3;
> +	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLDOWN);
> +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> +	sdhci_writew(host, val, PHY_STBPAD_CNFG_R);
> +
> +	/* enable phy dll */
> +	sdhci_writeb(host, PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R);
> +}
> +
> +static void th1520_sdhci_set_phy(struct sdhci_host *host)
> +{
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> +	u16 emmc_ctrl;
> +
> +	/* Before power on, set PHY configs */
> +	if (priv->flags & FLAG_IO_FIXED_1V8)
> +		th1520_phy_1_8v_init(host);
> +	else
> +		th1520_phy_3_3v_init(host);
> +
> +	if (host->mmc->caps & MMC_CAP_NONREMOVABLE) {

Hi Drew,

IMHO, this doesn't work for sdio. Normally, for a sdio wifi,
"non-removable" is set, then the EMMC bit will be set below unexpectedly.
So I suggested trying cap2 & (MMC_CAP2_NO_SD | MMC_CAP2_NO_SDIO)
and reflect this fact in the dt-binding, I.E if this host is for emmc
then no-sd and no-sdio is a must. I didn't see other
solutions.

PS: can sd and sdio work with this patch?

Thanks

> +		emmc_ctrl = sdhci_readw(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_CONTROL);
> +		emmc_ctrl |= DWCMSHC_CARD_IS_EMMC;
> +		sdhci_writew(host, emmc_ctrl, priv->vendor_specific_area1 + DWCMSHC_EMMC_CONTROL);
> +	}
> +
> +	sdhci_writeb(host, FIELD_PREP(PHY_DLL_CNFG1_SLVDLY_MASK, PHY_DLL_CNFG1_SLVDLY) |
> +		     PHY_DLL_CNFG1_WAITCYCLE, PHY_DLL_CNFG1_R);
> +}
> +
>  static void dwcmshc_set_uhs_signaling(struct sdhci_host *host,
>  				      unsigned int timing)
>  {
> @@ -189,9 +406,26 @@ static void dwcmshc_set_uhs_signaling(struct sdhci_host *host,
>  		ctrl_2 |= DWCMSHC_CTRL_HS400;
>  	}
>  
> +	if (priv->flags & FLAG_IO_FIXED_1V8)
> +		ctrl_2 |= SDHCI_CTRL_VDD_180;
>  	sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
>  }
>  
> +static void th1520_set_uhs_signaling(struct sdhci_host *host,
> +				     unsigned int timing)
> +{
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> +
> +	dwcmshc_set_uhs_signaling(host, timing);
> +	if (timing == MMC_TIMING_MMC_HS400) {
> +		priv->delay_line = PHY_SDCLKDL_DC_HS400;
> +		th1520_sdhci_set_phy(host);
> +	} else {
> +		sdhci_writeb(host, 0, PHY_DLLDL_CNFG_R);
> +	}
> +}
> +
>  static void dwcmshc_hs400_enhanced_strobe(struct mmc_host *mmc,
>  					  struct mmc_ios *ios)
>  {
> @@ -338,6 +572,85 @@ static void rk35xx_sdhci_reset(struct sdhci_host *host, u8 mask)
>  	sdhci_reset(host, mask);
>  }
>  
> +static int th1520_execute_tuning(struct sdhci_host *host, u32 opcode)
> +{
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> +	u32 val = 0;
> +
> +	if (host->flags & SDHCI_HS400_TUNING)
> +		return 0;
> +
> +	sdhci_writeb(host, FIELD_PREP(PHY_ATDL_CNFG_INPSEL_MASK, PHY_ATDL_CNFG_INPSEL),
> +		     PHY_ATDL_CNFG_R);
> +	val = sdhci_readl(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL);
> +
> +	/*
> +	 * configure tuning settings:
> +	 *  - center phase select code driven in block gap interval
> +	 *  - disable reporting of framing errors
> +	 *  - disable software managed tuning
> +	 *  - disable user selection of sampling window edges,
> +	 *    instead tuning calculated edges are used
> +	 */
> +	val &= ~(AT_CTRL_CI_SEL | AT_CTRL_RPT_TUNE_ERR | AT_CTRL_SW_TUNE_EN |
> +		 FIELD_PREP(AT_CTRL_WIN_EDGE_SEL_MASK, AT_CTRL_WIN_EDGE_SEL));
> +
> +	/*
> +	 * configure tuning settings:
> +	 *  - enable auto-tuning
> +	 *  - enable sampling window threshold
> +	 *  - stop clocks during phase code change
> +	 *  - set max latency in cycles between tx and rx clocks
> +	 *  - set max latency in cycles to switch output phase
> +	 *  - set max sampling window threshold value
> +	 */
> +	val |= AT_CTRL_AT_EN | AT_CTRL_SWIN_TH_EN | AT_CTRL_TUNE_CLK_STOP_EN;
> +	val |= FIELD_PREP(AT_CTRL_PRE_CHANGE_DLY_MASK, AT_CTRL_PRE_CHANGE_DLY);
> +	val |= FIELD_PREP(AT_CTRL_POST_CHANGE_DLY_MASK, AT_CTRL_POST_CHANGE_DLY);
> +	val |= FIELD_PREP(AT_CTRL_SWIN_TH_VAL_MASK, AT_CTRL_SWIN_TH_VAL);
> +
> +	sdhci_writel(host, val, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL);
> +	val = sdhci_readl(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL);
> +
> +	/* check if is possible to enable auto-tuning */

I'm not sure why do we need to check auto tuning is supported. Does this
mean some of the sdhci hosts in th1520 don't support auto tuing while
others support it?

> +	if (!(val & AT_CTRL_AT_EN)) {
> +		dev_err(mmc_dev(host->mmc), "failed to enable auto tuning\n");
> +		return -EIO;

FWICT, the controller can make use of sw tuning if AT isn't supported
but I think that could be an improvement in the future. We can focuse on
AT now.

> +	}
> +
> +	/* perform tuning */
> +	sdhci_start_tuning(host);
> +	host->tuning_err = __sdhci_execute_tuning(host, opcode);
> +	if (host->tuning_err) {
> +		/* disable auto-tuning upon tuning error */
> +		val &= ~AT_CTRL_AT_EN;
> +		sdhci_writel(host, val, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL);
> +		dev_err(mmc_dev(host->mmc), "tuning failed: %d\n", host->tuning_err);
> +		return -EIO;
> +	}
> +	sdhci_end_tuning(host);
> +
> +	return 0;
> +}
> +
> +static void th1520_sdhci_reset(struct sdhci_host *host, u8 mask)
> +{
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> +	u16 ctrl_2;
> +
> +	sdhci_reset(host, mask);
> +
> +	if (priv->flags & FLAG_IO_FIXED_1V8) {
> +		ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
> +		if (!(ctrl_2 & SDHCI_CTRL_VDD_180)) {
> +			ctrl_2 |= SDHCI_CTRL_VDD_180;
> +			sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
> +		}
> +	}
> +}
> +
>  static const struct sdhci_ops sdhci_dwcmshc_ops = {
>  	.set_clock		= sdhci_set_clock,
>  	.set_bus_width		= sdhci_set_bus_width,
> @@ -356,6 +669,17 @@ static const struct sdhci_ops sdhci_dwcmshc_rk35xx_ops = {
>  	.adma_write_desc	= dwcmshc_adma_write_desc,
>  };
>  
> +static const struct sdhci_ops sdhci_dwcmshc_th1520_ops = {
> +	.set_clock		= sdhci_set_clock,
> +	.set_bus_width		= sdhci_set_bus_width,
> +	.set_uhs_signaling	= th1520_set_uhs_signaling,
> +	.get_max_clock		= dwcmshc_get_max_clock,
> +	.reset			= th1520_sdhci_reset,
> +	.adma_write_desc	= dwcmshc_adma_write_desc,
> +	.voltage_switch		= th1520_phy_1_8v_init,
> +	.platform_execute_tuning = &th1520_execute_tuning,
> +};
> +
>  static const struct sdhci_pltfm_data sdhci_dwcmshc_pdata = {
>  	.ops = &sdhci_dwcmshc_ops,
>  	.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
> @@ -379,6 +703,12 @@ static const struct sdhci_pltfm_data sdhci_dwcmshc_rk35xx_pdata = {
>  		   SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
>  };
>  
> +static const struct sdhci_pltfm_data sdhci_dwcmshc_th1520_pdata = {
> +	.ops = &sdhci_dwcmshc_th1520_ops,
> +	.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
> +	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
> +};
> +
>  static int dwcmshc_rk35xx_init(struct sdhci_host *host, struct dwcmshc_priv *dwc_priv)
>  {
>  	int err;
> @@ -447,6 +777,10 @@ static const struct of_device_id sdhci_dwcmshc_dt_ids[] = {
>  		.compatible = "snps,dwcmshc-sdhci",
>  		.data = &sdhci_dwcmshc_pdata,
>  	},
> +	{
> +		.compatible = "thead,th1520-dwcmshc",
> +		.data = &sdhci_dwcmshc_th1520_pdata,
> +	},
>  	{},
>  };
>  MODULE_DEVICE_TABLE(of, sdhci_dwcmshc_dt_ids);
> @@ -542,6 +876,30 @@ static int dwcmshc_probe(struct platform_device *pdev)
>  			goto err_clk;
>  	}
>  
> +	if (pltfm_data == &sdhci_dwcmshc_th1520_pdata) {
> +		priv->delay_line = PHY_SDCLKDL_DC_DEFAULT;
> +
> +		if ((device_property_read_bool(dev, "mmc-ddr-1_8v")) |
> +		    (device_property_read_bool(dev, "mmc-hs200-1_8v")) |
> +		    (device_property_read_bool(dev, "mmc-hs400-1_8v")))
> +			priv->flags |= FLAG_IO_FIXED_1V8;
> +		else
> +			priv->flags &= ~FLAG_IO_FIXED_1V8;
> +
> +		/*
> +		 * start_signal_voltage_switch() will try 3.3V first
> +		 * then 1.8V. Use SDHCI_SIGNALING_180 ranther than
> +		 * SDHCI_SIGNALING_330 to avoid setting voltage to 3.3V
> +		 * in sdhci_start_signal_voltage_switch().
> +		 */
> +		if (priv->flags & FLAG_IO_FIXED_1V8) {
> +			host->flags &= ~SDHCI_SIGNALING_330;
> +			host->flags |=  SDHCI_SIGNALING_180;
> +		}
> +
> +		sdhci_enable_v4_mode(host);
> +	}
> +
>  #ifdef CONFIG_ACPI
>  	if (pltfm_data == &sdhci_dwcmshc_bf3_pdata)
>  		sdhci_enable_v4_mode(host);
> 
> -- 
> 2.34.1
> 

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Re: [PATCH v2 3/7] mmc: sdhci-of-dwcmshc: Add support for T-Head TH1520

[Drew Fustini]

On Wed, Oct 18, 2023 at 11:46:19PM +0800, Jisheng Zhang wrote:
> On Tue, Oct 17, 2023 at 01:43:49PM -0700, Drew Fustini wrote:
> > Add support for the mmc controller in the T-Head TH1520 with the new
> > compatible "thead,th1520-dwcmshc". Implement custom sdhci_ops for
> > set_uhs_signaling, reset, voltage_switch, and platform_execute_tuning.
> > 
> > Signed-off-by: Drew Fustini <dfustini@baylibre.com>
> > ---
> >  drivers/mmc/host/sdhci-of-dwcmshc.c | 358 ++++++++++++++++++++++++++++++++++++
> >  1 file changed, 358 insertions(+)
> > 
> > diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
> > index 3a3bae6948a8..88ed0937c4e9 100644
> > --- a/drivers/mmc/host/sdhci-of-dwcmshc.c
> > +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
> > @@ -8,6 +8,7 @@
> >   */
> >  
> >  #include <linux/acpi.h>
> > +#include <linux/bitfield.h>
> >  #include <linux/clk.h>
> >  #include <linux/dma-mapping.h>
> >  #include <linux/iopoll.h>
> > @@ -35,6 +36,21 @@
> >  #define DWCMSHC_CARD_IS_EMMC		BIT(0)
> >  #define DWCMSHC_ENHANCED_STROBE		BIT(8)
> >  #define DWCMSHC_EMMC_ATCTRL		0x40
> > +/* Tuning and auto-tuning fields in AT_CTRL_R control register */
> > +#define AT_CTRL_AT_EN			BIT(0) /* autotuning is enabled */
> > +#define AT_CTRL_CI_SEL			BIT(1) /* interval to drive center phase select */
> > +#define AT_CTRL_SWIN_TH_EN		BIT(2) /* sampling window threshold enable */
> > +#define AT_CTRL_RPT_TUNE_ERR		BIT(3) /* enable reporting framing errors */
> > +#define AT_CTRL_SW_TUNE_EN		BIT(4) /* enable software managed tuning */
> > +#define AT_CTRL_WIN_EDGE_SEL_MASK	GENMASK(11, 8) /* bits [11:8] */
> > +#define AT_CTRL_WIN_EDGE_SEL		0xf /* sampling window edge select */
> > +#define AT_CTRL_TUNE_CLK_STOP_EN	BIT(16) /* clocks stopped during phase code change */
> > +#define AT_CTRL_PRE_CHANGE_DLY_MASK	GENMASK(18, 17) /* bits [18:17] */
> > +#define AT_CTRL_PRE_CHANGE_DLY		0x1  /* 2-cycle latency */
> > +#define AT_CTRL_POST_CHANGE_DLY_MASK	GENMASK(20, 19) /* bits [20:19] */
> > +#define AT_CTRL_POST_CHANGE_DLY		0x3  /* 4-cycle latency */
> > +#define AT_CTRL_SWIN_TH_VAL_MASK	GENMASK(31, 24) /* bits [31:24] */
> > +#define AT_CTRL_SWIN_TH_VAL		0x9  /* sampling window threshold */
> >  
> >  /* Rockchip specific Registers */
> >  #define DWCMSHC_EMMC_DLL_CTRL		0x800
> > @@ -72,6 +88,82 @@
> >  	(((x) & DWCMSHC_EMMC_DLL_TIMEOUT) == 0))
> >  #define RK35xx_MAX_CLKS 3
> >  
> > +/* PHY register area pointer */
> > +#define DWC_MSHC_PTR_PHY_R	0x300
> > +
> > +/* PHY general configuration */
> > +#define PHY_CNFG_R		(DWC_MSHC_PTR_PHY_R + 0x00)
> > +#define PHY_CNFG_RSTN_DEASSERT	0x1  /* Deassert PHY reset */
> > +#define PHY_CNFG_PAD_SP_MASK	GENMASK(19, 16) /* bits [19:16] */
> > +#define PHY_CNFG_PAD_SP		0x0c /* PMOS TX drive strength */
> > +#define PHY_CNFG_PAD_SN_MASK	GENMASK(23, 20) /* bits [23:20] */
> > +#define PHY_CNFG_PAD_SN		0x0c /* NMOS TX drive strength */
> > +
> > +/* PHY command/response pad settings */
> > +#define PHY_CMDPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x04)
> > +
> > +/* PHY data pad settings */
> > +#define PHY_DATAPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x06)
> > +
> > +/* PHY clock pad settings */
> > +#define PHY_CLKPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x08)
> > +
> > +/* PHY strobe pad settings */
> > +#define PHY_STBPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x0a)
> > +
> > +/* PHY reset pad settings */
> > +#define PHY_RSTNPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x0c)
> > +
> > +/* Bitfields are common for all pad settings */
> > +#define PHY_PAD_RXSEL_1V8		0x1 /* Receiver type select for 1.8V */
> > +#define PHY_PAD_RXSEL_3V3		0x2 /* Receiver type select for 3.3V */
> > +
> > +#define PHY_PAD_WEAKPULL_MASK		GENMASK(4, 3) /* bits [4:3] */
> > +#define PHY_PAD_WEAKPULL_PULLUP		0x1 /* Weak pull down enabled */
> > +#define PHY_PAD_WEAKPULL_PULLDOWN	0x2 /* Weak pull down enabled */
> > +
> > +#define PHY_PAD_TXSLEW_CTRL_P_MASK	GENMASK(8, 5) /* bits [8:5] */
> > +#define PHY_PAD_TXSLEW_CTRL_P		0x3 /* Slew control for P-Type pad TX */
> > +#define PHY_PAD_TXSLEW_CTRL_N_MASK	GENMASK(12, 9) /* bits [12:9] */
> > +#define PHY_PAD_TXSLEW_CTRL_N		0x3 /* Slew control for N-Type pad TX */
> > +
> > +/* PHY CLK delay line settings */
> > +#define PHY_SDCLKDL_CNFG_R		(DWC_MSHC_PTR_PHY_R + 0x1d)
> > +#define PHY_SDCLKDL_CNFG_UPDATE	BIT(4) /* set before writing to SDCLKDL_DC */
> > +
> > +/* PHY CLK delay line delay code */
> > +#define PHY_SDCLKDL_DC_R		(DWC_MSHC_PTR_PHY_R + 0x1e)
> > +#define PHY_SDCLKDL_DC_INITIAL		0x40 /* initial delay code */
> > +#define PHY_SDCLKDL_DC_DEFAULT		0x32 /* default delay code */
> > +#define PHY_SDCLKDL_DC_HS400		0x18 /* delay code for HS400 mode */
> > +
> > +/* PHY drift_cclk_rx delay line configuration setting */
> > +#define PHY_ATDL_CNFG_R			(DWC_MSHC_PTR_PHY_R + 0x21)
> > +#define PHY_ATDL_CNFG_INPSEL_MASK	GENMASK(3, 2) /* bits [3:2] */
> > +#define PHY_ATDL_CNFG_INPSEL		0x3 /* delay line input source */
> > +
> > +/* PHY DLL control settings */
> > +#define PHY_DLL_CTRL_R			(DWC_MSHC_PTR_PHY_R + 0x24)
> > +#define PHY_DLL_CTRL_DISABLE		0x0 /* PHY DLL is enabled */
> > +#define PHY_DLL_CTRL_ENABLE		0x1 /* PHY DLL is disabled */
> > +
> > +/* PHY DLL  configuration register 1 */
> > +#define PHY_DLL_CNFG1_R			(DWC_MSHC_PTR_PHY_R + 0x25)
> > +#define PHY_DLL_CNFG1_SLVDLY_MASK	GENMASK(5, 4) /* bits [5:4] */
> > +#define PHY_DLL_CNFG1_SLVDLY		0x2 /* DLL slave update delay input */
> > +#define PHY_DLL_CNFG1_WAITCYCLE		0x5 /* DLL wait cycle input */
> > +
> > +/* PHY DLL configuration register 2 */
> > +#define PHY_DLL_CNFG2_R			(DWC_MSHC_PTR_PHY_R + 0x26)
> > +#define PHY_DLL_CNFG2_JUMPSTEP		0xa /* DLL jump step input */
> > +
> > +/* PHY DLL master and slave delay line configuration settings */
> > +#define PHY_DLLDL_CNFG_R		(DWC_MSHC_PTR_PHY_R + 0x28)
> > +#define PHY_DLLDL_CNFG_SLV_INPSEL_MASK	GENMASK(6, 5) /* bits [6:5] */
> > +#define PHY_DLLDL_CNFG_SLV_INPSEL	0x3 /* clock source select for slave DL */
> > +
> > +#define FLAG_IO_FIXED_1V8	BIT(0)
> > +
> >  #define BOUNDARY_OK(addr, len) \
> >  	((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1)))
> >  
> > @@ -92,6 +184,8 @@ struct dwcmshc_priv {
> >  	struct clk	*bus_clk;
> >  	int vendor_specific_area1; /* P_VENDOR_SPECIFIC_AREA reg */
> >  	void *priv; /* pointer to SoC private stuff */
> > +	u16 delay_line;
> > +	u16 flags;
> >  };
> >  
> >  /*
> > @@ -157,6 +251,129 @@ static void dwcmshc_request(struct mmc_host *mmc, struct mmc_request *mrq)
> >  	sdhci_request(mmc, mrq);
> >  }
> >  
> > +static void th1520_phy_1_8v_init(struct sdhci_host *host)
> > +{
> > +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> > +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> > +	u32 val;
> > +
> > +	if (!priv)
> > +		return;
> 
> this is impossible, can be removed.

Thanks, will do.

> 
> > +
> > +	/* deassert phy reset & set tx drive strength */
> > +	val = PHY_CNFG_RSTN_DEASSERT;
> > +	val |= FIELD_PREP(PHY_CNFG_PAD_SP_MASK, PHY_CNFG_PAD_SP);
> > +	val |= FIELD_PREP(PHY_CNFG_PAD_SN_MASK, PHY_CNFG_PAD_SN);
> > +	sdhci_writel(host, val, PHY_CNFG_R);
> > +
> > +	/* disable delay line */
> > +	sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE, PHY_SDCLKDL_CNFG_R);
> > +
> > +	/* set delay line */
> > +	sdhci_writeb(host, priv->delay_line, PHY_SDCLKDL_DC_R);
> > +	sdhci_writeb(host, PHY_DLL_CNFG2_JUMPSTEP, PHY_DLL_CNFG2_R);
> > +
> > +	/* enable delay lane */
> > +	val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R);
> > +	val &= ~(PHY_SDCLKDL_CNFG_UPDATE);
> > +	sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R);
> > +
> > +	/* configure phy pads */
> > +	val = PHY_PAD_RXSEL_1V8;
> > +	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLUP);
> > +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> > +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> > +	sdhci_writew(host, val, PHY_CMDPAD_CNFG_R);
> > +	sdhci_writew(host, val, PHY_DATAPAD_CNFG_R);
> > +	sdhci_writew(host, val, PHY_RSTNPAD_CNFG_R);
> > +
> > +	val = FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> > +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> > +	sdhci_writew(host, val, PHY_CLKPAD_CNFG_R);
> > +
> > +	val = PHY_PAD_RXSEL_1V8;
> > +	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLDOWN);
> > +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> > +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> > +	sdhci_writew(host, val, PHY_STBPAD_CNFG_R);
> > +
> > +	/* enable data strobe mode */
> > +	sdhci_writeb(host, FIELD_PREP(PHY_DLLDL_CNFG_SLV_INPSEL_MASK, PHY_DLLDL_CNFG_SLV_INPSEL),
> > +		     PHY_DLLDL_CNFG_R);
> > +
> > +	/* enable phy dll */
> > +	sdhci_writeb(host, PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R);
> > +}
> > +
> > +static void th1520_phy_3_3v_init(struct sdhci_host *host)
> > +{
> > +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> > +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> > +	u32 val;
> > +
> > +	/* deassert phy reset & set tx drive strength */
> > +	val = PHY_CNFG_RSTN_DEASSERT;
> > +	val |= FIELD_PREP(PHY_CNFG_PAD_SP_MASK, PHY_CNFG_PAD_SP);
> > +	val |= FIELD_PREP(PHY_CNFG_PAD_SN_MASK, PHY_CNFG_PAD_SN);
> > +	sdhci_writel(host, val, PHY_CNFG_R);
> > +
> > +	/* disable delay line */
> > +	sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE, PHY_SDCLKDL_CNFG_R);
> > +
> > +	/* set delay line */
> > +	sdhci_writeb(host, priv->delay_line, PHY_SDCLKDL_DC_R);
> > +	sdhci_writeb(host, PHY_DLL_CNFG2_JUMPSTEP, PHY_DLL_CNFG2_R);
> > +
> > +	/* enable delay lane */
> > +	val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R);
> > +	val &= ~(PHY_SDCLKDL_CNFG_UPDATE);
> > +	sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R);
> > +
> > +	/* configure phy pads */
> > +	val = PHY_PAD_RXSEL_3V3;
> > +	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLUP);
> > +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> > +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> > +	sdhci_writew(host, val, PHY_CMDPAD_CNFG_R);
> > +	sdhci_writew(host, val, PHY_DATAPAD_CNFG_R);
> > +	sdhci_writew(host, val, PHY_RSTNPAD_CNFG_R);
> > +
> > +	val = FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> > +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> > +	sdhci_writew(host, val, PHY_CLKPAD_CNFG_R);
> > +
> > +	val = PHY_PAD_RXSEL_3V3;
> > +	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLDOWN);
> > +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> > +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> > +	sdhci_writew(host, val, PHY_STBPAD_CNFG_R);
> > +
> > +	/* enable phy dll */
> > +	sdhci_writeb(host, PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R);
> > +}
> > +
> > +static void th1520_sdhci_set_phy(struct sdhci_host *host)
> > +{
> > +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> > +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> > +	u16 emmc_ctrl;
> > +
> > +	/* Before power on, set PHY configs */
> > +	if (priv->flags & FLAG_IO_FIXED_1V8)
> > +		th1520_phy_1_8v_init(host);
> > +	else
> > +		th1520_phy_3_3v_init(host);
> > +
> > +	if (host->mmc->caps & MMC_CAP_NONREMOVABLE) {
> 
> Hi Drew,
> 
> IMHO, this doesn't work for sdio. Normally, for a sdio wifi,
> "non-removable" is set, then the EMMC bit will be set below unexpectedly.
> So I suggested trying cap2 & (MMC_CAP2_NO_SD | MMC_CAP2_NO_SDIO)
> and reflect this fact in the dt-binding, I.E if this host is for emmc
> then no-sd and no-sdio is a must. I didn't see other
> solutions.

Thank you for explaining. I will change the code to test that instead.

> 
> PS: can sd and sdio work with this patch?

After sending v2, I tried enabling the sdhci nodes. Initially, the
microSD card was not recognized. Then I realized I needed to change
th1520_set_uhs_signaling() so that it calls th1520_sdhci_set_phy()
for all devices and not just for MMC_TIMING_MMC_HS400.

With that change, the microSD card did appear as a block device and
I was able to mount the vfat partition that was on the card.

I did not try enabling sdio for the wifi module yet.

> 
> Thanks
> 
> > +		emmc_ctrl = sdhci_readw(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_CONTROL);
> > +		emmc_ctrl |= DWCMSHC_CARD_IS_EMMC;
> > +		sdhci_writew(host, emmc_ctrl, priv->vendor_specific_area1 + DWCMSHC_EMMC_CONTROL);
> > +	}
> > +
> > +	sdhci_writeb(host, FIELD_PREP(PHY_DLL_CNFG1_SLVDLY_MASK, PHY_DLL_CNFG1_SLVDLY) |
> > +		     PHY_DLL_CNFG1_WAITCYCLE, PHY_DLL_CNFG1_R);
> > +}
> > +
> >  static void dwcmshc_set_uhs_signaling(struct sdhci_host *host,
> >  				      unsigned int timing)
> >  {
> > @@ -189,9 +406,26 @@ static void dwcmshc_set_uhs_signaling(struct sdhci_host *host,
> >  		ctrl_2 |= DWCMSHC_CTRL_HS400;
> >  	}
> >  
> > +	if (priv->flags & FLAG_IO_FIXED_1V8)
> > +		ctrl_2 |= SDHCI_CTRL_VDD_180;
> >  	sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
> >  }
> >  
> > +static void th1520_set_uhs_signaling(struct sdhci_host *host,
> > +				     unsigned int timing)
> > +{
> > +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> > +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> > +
> > +	dwcmshc_set_uhs_signaling(host, timing);
> > +	if (timing == MMC_TIMING_MMC_HS400) {
> > +		priv->delay_line = PHY_SDCLKDL_DC_HS400;
> > +		th1520_sdhci_set_phy(host);
> > +	} else {
> > +		sdhci_writeb(host, 0, PHY_DLLDL_CNFG_R);
> > +	}
> > +}
> > +
> >  static void dwcmshc_hs400_enhanced_strobe(struct mmc_host *mmc,
> >  					  struct mmc_ios *ios)
> >  {
> > @@ -338,6 +572,85 @@ static void rk35xx_sdhci_reset(struct sdhci_host *host, u8 mask)
> >  	sdhci_reset(host, mask);
> >  }
> >  
> > +static int th1520_execute_tuning(struct sdhci_host *host, u32 opcode)
> > +{
> > +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> > +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> > +	u32 val = 0;
> > +
> > +	if (host->flags & SDHCI_HS400_TUNING)
> > +		return 0;
> > +
> > +	sdhci_writeb(host, FIELD_PREP(PHY_ATDL_CNFG_INPSEL_MASK, PHY_ATDL_CNFG_INPSEL),
> > +		     PHY_ATDL_CNFG_R);
> > +	val = sdhci_readl(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL);
> > +
> > +	/*
> > +	 * configure tuning settings:
> > +	 *  - center phase select code driven in block gap interval
> > +	 *  - disable reporting of framing errors
> > +	 *  - disable software managed tuning
> > +	 *  - disable user selection of sampling window edges,
> > +	 *    instead tuning calculated edges are used
> > +	 */
> > +	val &= ~(AT_CTRL_CI_SEL | AT_CTRL_RPT_TUNE_ERR | AT_CTRL_SW_TUNE_EN |
> > +		 FIELD_PREP(AT_CTRL_WIN_EDGE_SEL_MASK, AT_CTRL_WIN_EDGE_SEL));
> > +
> > +	/*
> > +	 * configure tuning settings:
> > +	 *  - enable auto-tuning
> > +	 *  - enable sampling window threshold
> > +	 *  - stop clocks during phase code change
> > +	 *  - set max latency in cycles between tx and rx clocks
> > +	 *  - set max latency in cycles to switch output phase
> > +	 *  - set max sampling window threshold value
> > +	 */
> > +	val |= AT_CTRL_AT_EN | AT_CTRL_SWIN_TH_EN | AT_CTRL_TUNE_CLK_STOP_EN;
> > +	val |= FIELD_PREP(AT_CTRL_PRE_CHANGE_DLY_MASK, AT_CTRL_PRE_CHANGE_DLY);
> > +	val |= FIELD_PREP(AT_CTRL_POST_CHANGE_DLY_MASK, AT_CTRL_POST_CHANGE_DLY);
> > +	val |= FIELD_PREP(AT_CTRL_SWIN_TH_VAL_MASK, AT_CTRL_SWIN_TH_VAL);
> > +
> > +	sdhci_writel(host, val, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL);
> > +	val = sdhci_readl(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL);
> > +
> > +	/* check if is possible to enable auto-tuning */
> 
> I'm not sure why do we need to check auto tuning is supported. Does this
> mean some of the sdhci hosts in th1520 don't support auto tuing while
> others support it?

I agree that this doesn't seem to make sense. This was logic I found in
the T-Head kernel. I've never seen that message print thus far during my
testing, so I think this if() block is probably unnecessary.

I just removed that if() block and I found that eMMC an microSD still
work okay. I will remove this in the next revision.

> 
> > +	if (!(val & AT_CTRL_AT_EN)) {
> > +		dev_err(mmc_dev(host->mmc), "failed to enable auto tuning\n");
> > +		return -EIO;
> 
> FWICT, the controller can make use of sw tuning if AT isn't supported
> but I think that could be an improvement in the future. We can focuse on
> AT now.

Yes, I believe software controller tuning is an option, and I agree it
would be preferable to add that functionality later.
> 
> > +	}
> > +
> > +	/* perform tuning */
> > +	sdhci_start_tuning(host);
> > +	host->tuning_err = __sdhci_execute_tuning(host, opcode);
> > +	if (host->tuning_err) {
> > +		/* disable auto-tuning upon tuning error */
> > +		val &= ~AT_CTRL_AT_EN;
> > +		sdhci_writel(host, val, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL);
> > +		dev_err(mmc_dev(host->mmc), "tuning failed: %d\n", host->tuning_err);
> > +		return -EIO;
> > +	}
> > +	sdhci_end_tuning(host);
> > +
> > +	return 0;
> > +}
> > +
> > +static void th1520_sdhci_reset(struct sdhci_host *host, u8 mask)
> > +{
> > +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> > +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> > +	u16 ctrl_2;
> > +
> > +	sdhci_reset(host, mask);
> > +
> > +	if (priv->flags & FLAG_IO_FIXED_1V8) {
> > +		ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
> > +		if (!(ctrl_2 & SDHCI_CTRL_VDD_180)) {
> > +			ctrl_2 |= SDHCI_CTRL_VDD_180;
> > +			sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
> > +		}
> > +	}
> > +}
> > +
> >  static const struct sdhci_ops sdhci_dwcmshc_ops = {
> >  	.set_clock		= sdhci_set_clock,
> >  	.set_bus_width		= sdhci_set_bus_width,
> > @@ -356,6 +669,17 @@ static const struct sdhci_ops sdhci_dwcmshc_rk35xx_ops = {
> >  	.adma_write_desc	= dwcmshc_adma_write_desc,
> >  };
> >  
> > +static const struct sdhci_ops sdhci_dwcmshc_th1520_ops = {
> > +	.set_clock		= sdhci_set_clock,
> > +	.set_bus_width		= sdhci_set_bus_width,
> > +	.set_uhs_signaling	= th1520_set_uhs_signaling,
> > +	.get_max_clock		= dwcmshc_get_max_clock,
> > +	.reset			= th1520_sdhci_reset,
> > +	.adma_write_desc	= dwcmshc_adma_write_desc,
> > +	.voltage_switch		= th1520_phy_1_8v_init,
> > +	.platform_execute_tuning = &th1520_execute_tuning,
> > +};
> > +
> >  static const struct sdhci_pltfm_data sdhci_dwcmshc_pdata = {
> >  	.ops = &sdhci_dwcmshc_ops,
> >  	.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
> > @@ -379,6 +703,12 @@ static const struct sdhci_pltfm_data sdhci_dwcmshc_rk35xx_pdata = {
> >  		   SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
> >  };
> >  
> > +static const struct sdhci_pltfm_data sdhci_dwcmshc_th1520_pdata = {
> > +	.ops = &sdhci_dwcmshc_th1520_ops,
> > +	.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
> > +	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
> > +};
> > +
> >  static int dwcmshc_rk35xx_init(struct sdhci_host *host, struct dwcmshc_priv *dwc_priv)
> >  {
> >  	int err;
> > @@ -447,6 +777,10 @@ static const struct of_device_id sdhci_dwcmshc_dt_ids[] = {
> >  		.compatible = "snps,dwcmshc-sdhci",
> >  		.data = &sdhci_dwcmshc_pdata,
> >  	},
> > +	{
> > +		.compatible = "thead,th1520-dwcmshc",
> > +		.data = &sdhci_dwcmshc_th1520_pdata,
> > +	},
> >  	{},
> >  };
> >  MODULE_DEVICE_TABLE(of, sdhci_dwcmshc_dt_ids);
> > @@ -542,6 +876,30 @@ static int dwcmshc_probe(struct platform_device *pdev)
> >  			goto err_clk;
> >  	}
> >  
> > +	if (pltfm_data == &sdhci_dwcmshc_th1520_pdata) {
> > +		priv->delay_line = PHY_SDCLKDL_DC_DEFAULT;
> > +
> > +		if ((device_property_read_bool(dev, "mmc-ddr-1_8v")) |
> > +		    (device_property_read_bool(dev, "mmc-hs200-1_8v")) |
> > +		    (device_property_read_bool(dev, "mmc-hs400-1_8v")))
> > +			priv->flags |= FLAG_IO_FIXED_1V8;
> > +		else
> > +			priv->flags &= ~FLAG_IO_FIXED_1V8;
> > +
> > +		/*
> > +		 * start_signal_voltage_switch() will try 3.3V first
> > +		 * then 1.8V. Use SDHCI_SIGNALING_180 ranther than
> > +		 * SDHCI_SIGNALING_330 to avoid setting voltage to 3.3V
> > +		 * in sdhci_start_signal_voltage_switch().
> > +		 */
> > +		if (priv->flags & FLAG_IO_FIXED_1V8) {
> > +			host->flags &= ~SDHCI_SIGNALING_330;
> > +			host->flags |=  SDHCI_SIGNALING_180;
> > +		}
> > +
> > +		sdhci_enable_v4_mode(host);
> > +	}
> > +
> >  #ifdef CONFIG_ACPI
> >  	if (pltfm_data == &sdhci_dwcmshc_bf3_pdata)
> >  		sdhci_enable_v4_mode(host);
> > 
> > -- 
> > 2.34.1
> > 

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Re: [PATCH v2 3/7] mmc: sdhci-of-dwcmshc: Add support for T-Head TH1520

[Jisheng Zhang]

On Wed, Oct 18, 2023 at 11:27:26AM -0700, Drew Fustini wrote:
> On Wed, Oct 18, 2023 at 11:46:19PM +0800, Jisheng Zhang wrote:
> > On Tue, Oct 17, 2023 at 01:43:49PM -0700, Drew Fustini wrote:
> > > Add support for the mmc controller in the T-Head TH1520 with the new
> > > compatible "thead,th1520-dwcmshc". Implement custom sdhci_ops for
> > > set_uhs_signaling, reset, voltage_switch, and platform_execute_tuning.
> > > 
> > > Signed-off-by: Drew Fustini <dfustini@baylibre.com>
> > > ---
> > >  drivers/mmc/host/sdhci-of-dwcmshc.c | 358 ++++++++++++++++++++++++++++++++++++
> > >  1 file changed, 358 insertions(+)
> > > 
> > > diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
> > > index 3a3bae6948a8..88ed0937c4e9 100644
> > > --- a/drivers/mmc/host/sdhci-of-dwcmshc.c
> > > +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
> > > @@ -8,6 +8,7 @@
> > >   */
> > >  
> > >  #include <linux/acpi.h>
> > > +#include <linux/bitfield.h>
> > >  #include <linux/clk.h>
> > >  #include <linux/dma-mapping.h>
> > >  #include <linux/iopoll.h>
> > > @@ -35,6 +36,21 @@
> > >  #define DWCMSHC_CARD_IS_EMMC		BIT(0)
> > >  #define DWCMSHC_ENHANCED_STROBE		BIT(8)
> > >  #define DWCMSHC_EMMC_ATCTRL		0x40
> > > +/* Tuning and auto-tuning fields in AT_CTRL_R control register */
> > > +#define AT_CTRL_AT_EN			BIT(0) /* autotuning is enabled */
> > > +#define AT_CTRL_CI_SEL			BIT(1) /* interval to drive center phase select */
> > > +#define AT_CTRL_SWIN_TH_EN		BIT(2) /* sampling window threshold enable */
> > > +#define AT_CTRL_RPT_TUNE_ERR		BIT(3) /* enable reporting framing errors */
> > > +#define AT_CTRL_SW_TUNE_EN		BIT(4) /* enable software managed tuning */
> > > +#define AT_CTRL_WIN_EDGE_SEL_MASK	GENMASK(11, 8) /* bits [11:8] */
> > > +#define AT_CTRL_WIN_EDGE_SEL		0xf /* sampling window edge select */
> > > +#define AT_CTRL_TUNE_CLK_STOP_EN	BIT(16) /* clocks stopped during phase code change */
> > > +#define AT_CTRL_PRE_CHANGE_DLY_MASK	GENMASK(18, 17) /* bits [18:17] */
> > > +#define AT_CTRL_PRE_CHANGE_DLY		0x1  /* 2-cycle latency */
> > > +#define AT_CTRL_POST_CHANGE_DLY_MASK	GENMASK(20, 19) /* bits [20:19] */
> > > +#define AT_CTRL_POST_CHANGE_DLY		0x3  /* 4-cycle latency */
> > > +#define AT_CTRL_SWIN_TH_VAL_MASK	GENMASK(31, 24) /* bits [31:24] */
> > > +#define AT_CTRL_SWIN_TH_VAL		0x9  /* sampling window threshold */
> > >  
> > >  /* Rockchip specific Registers */
> > >  #define DWCMSHC_EMMC_DLL_CTRL		0x800
> > > @@ -72,6 +88,82 @@
> > >  	(((x) & DWCMSHC_EMMC_DLL_TIMEOUT) == 0))
> > >  #define RK35xx_MAX_CLKS 3
> > >  
> > > +/* PHY register area pointer */
> > > +#define DWC_MSHC_PTR_PHY_R	0x300
> > > +
> > > +/* PHY general configuration */
> > > +#define PHY_CNFG_R		(DWC_MSHC_PTR_PHY_R + 0x00)
> > > +#define PHY_CNFG_RSTN_DEASSERT	0x1  /* Deassert PHY reset */
> > > +#define PHY_CNFG_PAD_SP_MASK	GENMASK(19, 16) /* bits [19:16] */
> > > +#define PHY_CNFG_PAD_SP		0x0c /* PMOS TX drive strength */
> > > +#define PHY_CNFG_PAD_SN_MASK	GENMASK(23, 20) /* bits [23:20] */
> > > +#define PHY_CNFG_PAD_SN		0x0c /* NMOS TX drive strength */
> > > +
> > > +/* PHY command/response pad settings */
> > > +#define PHY_CMDPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x04)
> > > +
> > > +/* PHY data pad settings */
> > > +#define PHY_DATAPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x06)
> > > +
> > > +/* PHY clock pad settings */
> > > +#define PHY_CLKPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x08)
> > > +
> > > +/* PHY strobe pad settings */
> > > +#define PHY_STBPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x0a)
> > > +
> > > +/* PHY reset pad settings */
> > > +#define PHY_RSTNPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x0c)
> > > +
> > > +/* Bitfields are common for all pad settings */
> > > +#define PHY_PAD_RXSEL_1V8		0x1 /* Receiver type select for 1.8V */
> > > +#define PHY_PAD_RXSEL_3V3		0x2 /* Receiver type select for 3.3V */
> > > +
> > > +#define PHY_PAD_WEAKPULL_MASK		GENMASK(4, 3) /* bits [4:3] */
> > > +#define PHY_PAD_WEAKPULL_PULLUP		0x1 /* Weak pull down enabled */
> > > +#define PHY_PAD_WEAKPULL_PULLDOWN	0x2 /* Weak pull down enabled */
> > > +
> > > +#define PHY_PAD_TXSLEW_CTRL_P_MASK	GENMASK(8, 5) /* bits [8:5] */
> > > +#define PHY_PAD_TXSLEW_CTRL_P		0x3 /* Slew control for P-Type pad TX */
> > > +#define PHY_PAD_TXSLEW_CTRL_N_MASK	GENMASK(12, 9) /* bits [12:9] */
> > > +#define PHY_PAD_TXSLEW_CTRL_N		0x3 /* Slew control for N-Type pad TX */
> > > +
> > > +/* PHY CLK delay line settings */
> > > +#define PHY_SDCLKDL_CNFG_R		(DWC_MSHC_PTR_PHY_R + 0x1d)
> > > +#define PHY_SDCLKDL_CNFG_UPDATE	BIT(4) /* set before writing to SDCLKDL_DC */
> > > +
> > > +/* PHY CLK delay line delay code */
> > > +#define PHY_SDCLKDL_DC_R		(DWC_MSHC_PTR_PHY_R + 0x1e)
> > > +#define PHY_SDCLKDL_DC_INITIAL		0x40 /* initial delay code */
> > > +#define PHY_SDCLKDL_DC_DEFAULT		0x32 /* default delay code */
> > > +#define PHY_SDCLKDL_DC_HS400		0x18 /* delay code for HS400 mode */
> > > +
> > > +/* PHY drift_cclk_rx delay line configuration setting */
> > > +#define PHY_ATDL_CNFG_R			(DWC_MSHC_PTR_PHY_R + 0x21)
> > > +#define PHY_ATDL_CNFG_INPSEL_MASK	GENMASK(3, 2) /* bits [3:2] */
> > > +#define PHY_ATDL_CNFG_INPSEL		0x3 /* delay line input source */
> > > +
> > > +/* PHY DLL control settings */
> > > +#define PHY_DLL_CTRL_R			(DWC_MSHC_PTR_PHY_R + 0x24)
> > > +#define PHY_DLL_CTRL_DISABLE		0x0 /* PHY DLL is enabled */
> > > +#define PHY_DLL_CTRL_ENABLE		0x1 /* PHY DLL is disabled */
> > > +
> > > +/* PHY DLL  configuration register 1 */
> > > +#define PHY_DLL_CNFG1_R			(DWC_MSHC_PTR_PHY_R + 0x25)
> > > +#define PHY_DLL_CNFG1_SLVDLY_MASK	GENMASK(5, 4) /* bits [5:4] */
> > > +#define PHY_DLL_CNFG1_SLVDLY		0x2 /* DLL slave update delay input */
> > > +#define PHY_DLL_CNFG1_WAITCYCLE		0x5 /* DLL wait cycle input */
> > > +
> > > +/* PHY DLL configuration register 2 */
> > > +#define PHY_DLL_CNFG2_R			(DWC_MSHC_PTR_PHY_R + 0x26)
> > > +#define PHY_DLL_CNFG2_JUMPSTEP		0xa /* DLL jump step input */
> > > +
> > > +/* PHY DLL master and slave delay line configuration settings */
> > > +#define PHY_DLLDL_CNFG_R		(DWC_MSHC_PTR_PHY_R + 0x28)
> > > +#define PHY_DLLDL_CNFG_SLV_INPSEL_MASK	GENMASK(6, 5) /* bits [6:5] */
> > > +#define PHY_DLLDL_CNFG_SLV_INPSEL	0x3 /* clock source select for slave DL */
> > > +
> > > +#define FLAG_IO_FIXED_1V8	BIT(0)
> > > +
> > >  #define BOUNDARY_OK(addr, len) \
> > >  	((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1)))
> > >  
> > > @@ -92,6 +184,8 @@ struct dwcmshc_priv {
> > >  	struct clk	*bus_clk;
> > >  	int vendor_specific_area1; /* P_VENDOR_SPECIFIC_AREA reg */
> > >  	void *priv; /* pointer to SoC private stuff */
> > > +	u16 delay_line;
> > > +	u16 flags;
> > >  };
> > >  
> > >  /*
> > > @@ -157,6 +251,129 @@ static void dwcmshc_request(struct mmc_host *mmc, struct mmc_request *mrq)
> > >  	sdhci_request(mmc, mrq);
> > >  }
> > >  
> > > +static void th1520_phy_1_8v_init(struct sdhci_host *host)
> > > +{
> > > +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> > > +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> > > +	u32 val;
> > > +
> > > +	if (!priv)
> > > +		return;
> > 
> > this is impossible, can be removed.
> 
> Thanks, will do.
> 
> > 
> > > +
> > > +	/* deassert phy reset & set tx drive strength */
> > > +	val = PHY_CNFG_RSTN_DEASSERT;
> > > +	val |= FIELD_PREP(PHY_CNFG_PAD_SP_MASK, PHY_CNFG_PAD_SP);
> > > +	val |= FIELD_PREP(PHY_CNFG_PAD_SN_MASK, PHY_CNFG_PAD_SN);
> > > +	sdhci_writel(host, val, PHY_CNFG_R);
> > > +
> > > +	/* disable delay line */
> > > +	sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE, PHY_SDCLKDL_CNFG_R);
> > > +
> > > +	/* set delay line */
> > > +	sdhci_writeb(host, priv->delay_line, PHY_SDCLKDL_DC_R);
> > > +	sdhci_writeb(host, PHY_DLL_CNFG2_JUMPSTEP, PHY_DLL_CNFG2_R);
> > > +
> > > +	/* enable delay lane */
> > > +	val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R);
> > > +	val &= ~(PHY_SDCLKDL_CNFG_UPDATE);
> > > +	sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R);
> > > +
> > > +	/* configure phy pads */
> > > +	val = PHY_PAD_RXSEL_1V8;
> > > +	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLUP);
> > > +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> > > +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> > > +	sdhci_writew(host, val, PHY_CMDPAD_CNFG_R);
> > > +	sdhci_writew(host, val, PHY_DATAPAD_CNFG_R);
> > > +	sdhci_writew(host, val, PHY_RSTNPAD_CNFG_R);
> > > +
> > > +	val = FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> > > +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> > > +	sdhci_writew(host, val, PHY_CLKPAD_CNFG_R);
> > > +
> > > +	val = PHY_PAD_RXSEL_1V8;
> > > +	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLDOWN);
> > > +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> > > +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> > > +	sdhci_writew(host, val, PHY_STBPAD_CNFG_R);
> > > +
> > > +	/* enable data strobe mode */
> > > +	sdhci_writeb(host, FIELD_PREP(PHY_DLLDL_CNFG_SLV_INPSEL_MASK, PHY_DLLDL_CNFG_SLV_INPSEL),
> > > +		     PHY_DLLDL_CNFG_R);
> > > +
> > > +	/* enable phy dll */
> > > +	sdhci_writeb(host, PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R);
> > > +}
> > > +
> > > +static void th1520_phy_3_3v_init(struct sdhci_host *host)
> > > +{
> > > +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> > > +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> > > +	u32 val;
> > > +
> > > +	/* deassert phy reset & set tx drive strength */
> > > +	val = PHY_CNFG_RSTN_DEASSERT;
> > > +	val |= FIELD_PREP(PHY_CNFG_PAD_SP_MASK, PHY_CNFG_PAD_SP);
> > > +	val |= FIELD_PREP(PHY_CNFG_PAD_SN_MASK, PHY_CNFG_PAD_SN);
> > > +	sdhci_writel(host, val, PHY_CNFG_R);
> > > +
> > > +	/* disable delay line */
> > > +	sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE, PHY_SDCLKDL_CNFG_R);
> > > +
> > > +	/* set delay line */
> > > +	sdhci_writeb(host, priv->delay_line, PHY_SDCLKDL_DC_R);
> > > +	sdhci_writeb(host, PHY_DLL_CNFG2_JUMPSTEP, PHY_DLL_CNFG2_R);
> > > +
> > > +	/* enable delay lane */
> > > +	val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R);
> > > +	val &= ~(PHY_SDCLKDL_CNFG_UPDATE);
> > > +	sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R);
> > > +
> > > +	/* configure phy pads */
> > > +	val = PHY_PAD_RXSEL_3V3;
> > > +	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLUP);
> > > +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> > > +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> > > +	sdhci_writew(host, val, PHY_CMDPAD_CNFG_R);
> > > +	sdhci_writew(host, val, PHY_DATAPAD_CNFG_R);
> > > +	sdhci_writew(host, val, PHY_RSTNPAD_CNFG_R);
> > > +
> > > +	val = FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> > > +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> > > +	sdhci_writew(host, val, PHY_CLKPAD_CNFG_R);
> > > +
> > > +	val = PHY_PAD_RXSEL_3V3;
> > > +	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLDOWN);
> > > +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> > > +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> > > +	sdhci_writew(host, val, PHY_STBPAD_CNFG_R);
> > > +
> > > +	/* enable phy dll */
> > > +	sdhci_writeb(host, PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R);
> > > +}
> > > +
> > > +static void th1520_sdhci_set_phy(struct sdhci_host *host)
> > > +{
> > > +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> > > +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> > > +	u16 emmc_ctrl;
> > > +
> > > +	/* Before power on, set PHY configs */
> > > +	if (priv->flags & FLAG_IO_FIXED_1V8)
> > > +		th1520_phy_1_8v_init(host);
> > > +	else
> > > +		th1520_phy_3_3v_init(host);
> > > +
> > > +	if (host->mmc->caps & MMC_CAP_NONREMOVABLE) {
> > 
> > Hi Drew,
> > 
> > IMHO, this doesn't work for sdio. Normally, for a sdio wifi,
> > "non-removable" is set, then the EMMC bit will be set below unexpectedly.
> > So I suggested trying cap2 & (MMC_CAP2_NO_SD | MMC_CAP2_NO_SDIO)
> > and reflect this fact in the dt-binding, I.E if this host is for emmc
> > then no-sd and no-sdio is a must. I didn't see other
> > solutions.
> 
> Thank you for explaining. I will change the code to test that instead.

FYI, my patch in my local repo looks like:

u32 tmp = MMC_CAP2_NO_SD | MMC_CAP2_NO_SDIO;
if ((cap2 & tmp) == tmp) {
	blablabla...
}

> 
> > 
> > PS: can sd and sdio work with this patch?
> 
> After sending v2, I tried enabling the sdhci nodes. Initially, the
> microSD card was not recognized. Then I realized I needed to change
> th1520_set_uhs_signaling() so that it calls th1520_sdhci_set_phy()
> for all devices and not just for MMC_TIMING_MMC_HS400.
> 
> With that change, the microSD card did appear as a block device and
> I was able to mount the vfat partition that was on the card.
> 
> I did not try enabling sdio for the wifi module yet.
> 
> > 
> > Thanks
> > 
> > > +		emmc_ctrl = sdhci_readw(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_CONTROL);
> > > +		emmc_ctrl |= DWCMSHC_CARD_IS_EMMC;
> > > +		sdhci_writew(host, emmc_ctrl, priv->vendor_specific_area1 + DWCMSHC_EMMC_CONTROL);
> > > +	}
> > > +
> > > +	sdhci_writeb(host, FIELD_PREP(PHY_DLL_CNFG1_SLVDLY_MASK, PHY_DLL_CNFG1_SLVDLY) |
> > > +		     PHY_DLL_CNFG1_WAITCYCLE, PHY_DLL_CNFG1_R);
> > > +}
> > > +
> > >  static void dwcmshc_set_uhs_signaling(struct sdhci_host *host,
> > >  				      unsigned int timing)
> > >  {
> > > @@ -189,9 +406,26 @@ static void dwcmshc_set_uhs_signaling(struct sdhci_host *host,
> > >  		ctrl_2 |= DWCMSHC_CTRL_HS400;
> > >  	}
> > >  
> > > +	if (priv->flags & FLAG_IO_FIXED_1V8)
> > > +		ctrl_2 |= SDHCI_CTRL_VDD_180;
> > >  	sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
> > >  }
> > >  
> > > +static void th1520_set_uhs_signaling(struct sdhci_host *host,
> > > +				     unsigned int timing)
> > > +{
> > > +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> > > +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> > > +
> > > +	dwcmshc_set_uhs_signaling(host, timing);
> > > +	if (timing == MMC_TIMING_MMC_HS400) {
> > > +		priv->delay_line = PHY_SDCLKDL_DC_HS400;
> > > +		th1520_sdhci_set_phy(host);
> > > +	} else {
> > > +		sdhci_writeb(host, 0, PHY_DLLDL_CNFG_R);
> > > +	}
> > > +}
> > > +
> > >  static void dwcmshc_hs400_enhanced_strobe(struct mmc_host *mmc,
> > >  					  struct mmc_ios *ios)
> > >  {
> > > @@ -338,6 +572,85 @@ static void rk35xx_sdhci_reset(struct sdhci_host *host, u8 mask)
> > >  	sdhci_reset(host, mask);
> > >  }
> > >  
> > > +static int th1520_execute_tuning(struct sdhci_host *host, u32 opcode)
> > > +{
> > > +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> > > +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> > > +	u32 val = 0;
> > > +
> > > +	if (host->flags & SDHCI_HS400_TUNING)
> > > +		return 0;
> > > +
> > > +	sdhci_writeb(host, FIELD_PREP(PHY_ATDL_CNFG_INPSEL_MASK, PHY_ATDL_CNFG_INPSEL),
> > > +		     PHY_ATDL_CNFG_R);
> > > +	val = sdhci_readl(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL);
> > > +
> > > +	/*
> > > +	 * configure tuning settings:
> > > +	 *  - center phase select code driven in block gap interval
> > > +	 *  - disable reporting of framing errors
> > > +	 *  - disable software managed tuning
> > > +	 *  - disable user selection of sampling window edges,
> > > +	 *    instead tuning calculated edges are used
> > > +	 */
> > > +	val &= ~(AT_CTRL_CI_SEL | AT_CTRL_RPT_TUNE_ERR | AT_CTRL_SW_TUNE_EN |
> > > +		 FIELD_PREP(AT_CTRL_WIN_EDGE_SEL_MASK, AT_CTRL_WIN_EDGE_SEL));
> > > +
> > > +	/*
> > > +	 * configure tuning settings:
> > > +	 *  - enable auto-tuning
> > > +	 *  - enable sampling window threshold
> > > +	 *  - stop clocks during phase code change
> > > +	 *  - set max latency in cycles between tx and rx clocks
> > > +	 *  - set max latency in cycles to switch output phase
> > > +	 *  - set max sampling window threshold value
> > > +	 */
> > > +	val |= AT_CTRL_AT_EN | AT_CTRL_SWIN_TH_EN | AT_CTRL_TUNE_CLK_STOP_EN;
> > > +	val |= FIELD_PREP(AT_CTRL_PRE_CHANGE_DLY_MASK, AT_CTRL_PRE_CHANGE_DLY);
> > > +	val |= FIELD_PREP(AT_CTRL_POST_CHANGE_DLY_MASK, AT_CTRL_POST_CHANGE_DLY);
> > > +	val |= FIELD_PREP(AT_CTRL_SWIN_TH_VAL_MASK, AT_CTRL_SWIN_TH_VAL);
> > > +
> > > +	sdhci_writel(host, val, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL);
> > > +	val = sdhci_readl(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL);
> > > +
> > > +	/* check if is possible to enable auto-tuning */
> > 
> > I'm not sure why do we need to check auto tuning is supported. Does this
> > mean some of the sdhci hosts in th1520 don't support auto tuing while
> > others support it?
> 
> I agree that this doesn't seem to make sense. This was logic I found in
> the T-Head kernel. I've never seen that message print thus far during my
> testing, so I think this if() block is probably unnecessary.
> 
> I just removed that if() block and I found that eMMC an microSD still
> work okay. I will remove this in the next revision.
> 
> > 
> > > +	if (!(val & AT_CTRL_AT_EN)) {
> > > +		dev_err(mmc_dev(host->mmc), "failed to enable auto tuning\n");
> > > +		return -EIO;
> > 
> > FWICT, the controller can make use of sw tuning if AT isn't supported
> > but I think that could be an improvement in the future. We can focuse on
> > AT now.
> 
> Yes, I believe software controller tuning is an option, and I agree it
> would be preferable to add that functionality later.
> > 
> > > +	}
> > > +
> > > +	/* perform tuning */
> > > +	sdhci_start_tuning(host);
> > > +	host->tuning_err = __sdhci_execute_tuning(host, opcode);
> > > +	if (host->tuning_err) {
> > > +		/* disable auto-tuning upon tuning error */
> > > +		val &= ~AT_CTRL_AT_EN;
> > > +		sdhci_writel(host, val, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL);
> > > +		dev_err(mmc_dev(host->mmc), "tuning failed: %d\n", host->tuning_err);
> > > +		return -EIO;
> > > +	}
> > > +	sdhci_end_tuning(host);
> > > +
> > > +	return 0;
> > > +}
> > > +
> > > +static void th1520_sdhci_reset(struct sdhci_host *host, u8 mask)
> > > +{
> > > +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> > > +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> > > +	u16 ctrl_2;
> > > +
> > > +	sdhci_reset(host, mask);
> > > +
> > > +	if (priv->flags & FLAG_IO_FIXED_1V8) {
> > > +		ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
> > > +		if (!(ctrl_2 & SDHCI_CTRL_VDD_180)) {
> > > +			ctrl_2 |= SDHCI_CTRL_VDD_180;
> > > +			sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
> > > +		}
> > > +	}
> > > +}
> > > +
> > >  static const struct sdhci_ops sdhci_dwcmshc_ops = {
> > >  	.set_clock		= sdhci_set_clock,
> > >  	.set_bus_width		= sdhci_set_bus_width,
> > > @@ -356,6 +669,17 @@ static const struct sdhci_ops sdhci_dwcmshc_rk35xx_ops = {
> > >  	.adma_write_desc	= dwcmshc_adma_write_desc,
> > >  };
> > >  
> > > +static const struct sdhci_ops sdhci_dwcmshc_th1520_ops = {
> > > +	.set_clock		= sdhci_set_clock,
> > > +	.set_bus_width		= sdhci_set_bus_width,
> > > +	.set_uhs_signaling	= th1520_set_uhs_signaling,
> > > +	.get_max_clock		= dwcmshc_get_max_clock,
> > > +	.reset			= th1520_sdhci_reset,
> > > +	.adma_write_desc	= dwcmshc_adma_write_desc,
> > > +	.voltage_switch		= th1520_phy_1_8v_init,
> > > +	.platform_execute_tuning = &th1520_execute_tuning,
> > > +};
> > > +
> > >  static const struct sdhci_pltfm_data sdhci_dwcmshc_pdata = {
> > >  	.ops = &sdhci_dwcmshc_ops,
> > >  	.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
> > > @@ -379,6 +703,12 @@ static const struct sdhci_pltfm_data sdhci_dwcmshc_rk35xx_pdata = {
> > >  		   SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
> > >  };
> > >  
> > > +static const struct sdhci_pltfm_data sdhci_dwcmshc_th1520_pdata = {
> > > +	.ops = &sdhci_dwcmshc_th1520_ops,
> > > +	.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
> > > +	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
> > > +};
> > > +
> > >  static int dwcmshc_rk35xx_init(struct sdhci_host *host, struct dwcmshc_priv *dwc_priv)
> > >  {
> > >  	int err;
> > > @@ -447,6 +777,10 @@ static const struct of_device_id sdhci_dwcmshc_dt_ids[] = {
> > >  		.compatible = "snps,dwcmshc-sdhci",
> > >  		.data = &sdhci_dwcmshc_pdata,
> > >  	},
> > > +	{
> > > +		.compatible = "thead,th1520-dwcmshc",
> > > +		.data = &sdhci_dwcmshc_th1520_pdata,
> > > +	},
> > >  	{},
> > >  };
> > >  MODULE_DEVICE_TABLE(of, sdhci_dwcmshc_dt_ids);
> > > @@ -542,6 +876,30 @@ static int dwcmshc_probe(struct platform_device *pdev)
> > >  			goto err_clk;
> > >  	}
> > >  
> > > +	if (pltfm_data == &sdhci_dwcmshc_th1520_pdata) {
> > > +		priv->delay_line = PHY_SDCLKDL_DC_DEFAULT;
> > > +
> > > +		if ((device_property_read_bool(dev, "mmc-ddr-1_8v")) |
> > > +		    (device_property_read_bool(dev, "mmc-hs200-1_8v")) |
> > > +		    (device_property_read_bool(dev, "mmc-hs400-1_8v")))
> > > +			priv->flags |= FLAG_IO_FIXED_1V8;
> > > +		else
> > > +			priv->flags &= ~FLAG_IO_FIXED_1V8;
> > > +
> > > +		/*
> > > +		 * start_signal_voltage_switch() will try 3.3V first
> > > +		 * then 1.8V. Use SDHCI_SIGNALING_180 ranther than
> > > +		 * SDHCI_SIGNALING_330 to avoid setting voltage to 3.3V
> > > +		 * in sdhci_start_signal_voltage_switch().
> > > +		 */
> > > +		if (priv->flags & FLAG_IO_FIXED_1V8) {
> > > +			host->flags &= ~SDHCI_SIGNALING_330;
> > > +			host->flags |=  SDHCI_SIGNALING_180;
> > > +		}
> > > +
> > > +		sdhci_enable_v4_mode(host);
> > > +	}
> > > +
> > >  #ifdef CONFIG_ACPI
> > >  	if (pltfm_data == &sdhci_dwcmshc_bf3_pdata)
> > >  		sdhci_enable_v4_mode(host);
> > > 
> > > -- 
> > > 2.34.1
> > > 

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Re: [PATCH v2 3/7] mmc: sdhci-of-dwcmshc: Add support for T-Head TH1520

[Adrian Hunter]

On 17/10/23 23:43, Drew Fustini wrote:
> Add support for the mmc controller in the T-Head TH1520 with the new
> compatible "thead,th1520-dwcmshc". Implement custom sdhci_ops for
> set_uhs_signaling, reset, voltage_switch, and platform_execute_tuning.
> 
> Signed-off-by: Drew Fustini <dfustini@baylibre.com>
> ---
>  drivers/mmc/host/sdhci-of-dwcmshc.c | 358 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 358 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
> index 3a3bae6948a8..88ed0937c4e9 100644
> --- a/drivers/mmc/host/sdhci-of-dwcmshc.c
> +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
> @@ -8,6 +8,7 @@
>   */
>  
>  #include <linux/acpi.h>
> +#include <linux/bitfield.h>
>  #include <linux/clk.h>
>  #include <linux/dma-mapping.h>
>  #include <linux/iopoll.h>
> @@ -35,6 +36,21 @@
>  #define DWCMSHC_CARD_IS_EMMC		BIT(0)
>  #define DWCMSHC_ENHANCED_STROBE		BIT(8)
>  #define DWCMSHC_EMMC_ATCTRL		0x40
> +/* Tuning and auto-tuning fields in AT_CTRL_R control register */
> +#define AT_CTRL_AT_EN			BIT(0) /* autotuning is enabled */
> +#define AT_CTRL_CI_SEL			BIT(1) /* interval to drive center phase select */
> +#define AT_CTRL_SWIN_TH_EN		BIT(2) /* sampling window threshold enable */
> +#define AT_CTRL_RPT_TUNE_ERR		BIT(3) /* enable reporting framing errors */
> +#define AT_CTRL_SW_TUNE_EN		BIT(4) /* enable software managed tuning */
> +#define AT_CTRL_WIN_EDGE_SEL_MASK	GENMASK(11, 8) /* bits [11:8] */
> +#define AT_CTRL_WIN_EDGE_SEL		0xf /* sampling window edge select */
> +#define AT_CTRL_TUNE_CLK_STOP_EN	BIT(16) /* clocks stopped during phase code change */
> +#define AT_CTRL_PRE_CHANGE_DLY_MASK	GENMASK(18, 17) /* bits [18:17] */
> +#define AT_CTRL_PRE_CHANGE_DLY		0x1  /* 2-cycle latency */
> +#define AT_CTRL_POST_CHANGE_DLY_MASK	GENMASK(20, 19) /* bits [20:19] */
> +#define AT_CTRL_POST_CHANGE_DLY		0x3  /* 4-cycle latency */
> +#define AT_CTRL_SWIN_TH_VAL_MASK	GENMASK(31, 24) /* bits [31:24] */
> +#define AT_CTRL_SWIN_TH_VAL		0x9  /* sampling window threshold */
>  
>  /* Rockchip specific Registers */
>  #define DWCMSHC_EMMC_DLL_CTRL		0x800
> @@ -72,6 +88,82 @@
>  	(((x) & DWCMSHC_EMMC_DLL_TIMEOUT) == 0))
>  #define RK35xx_MAX_CLKS 3
>  
> +/* PHY register area pointer */
> +#define DWC_MSHC_PTR_PHY_R	0x300
> +
> +/* PHY general configuration */
> +#define PHY_CNFG_R		(DWC_MSHC_PTR_PHY_R + 0x00)
> +#define PHY_CNFG_RSTN_DEASSERT	0x1  /* Deassert PHY reset */
> +#define PHY_CNFG_PAD_SP_MASK	GENMASK(19, 16) /* bits [19:16] */
> +#define PHY_CNFG_PAD_SP		0x0c /* PMOS TX drive strength */
> +#define PHY_CNFG_PAD_SN_MASK	GENMASK(23, 20) /* bits [23:20] */
> +#define PHY_CNFG_PAD_SN		0x0c /* NMOS TX drive strength */
> +
> +/* PHY command/response pad settings */
> +#define PHY_CMDPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x04)
> +
> +/* PHY data pad settings */
> +#define PHY_DATAPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x06)
> +
> +/* PHY clock pad settings */
> +#define PHY_CLKPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x08)
> +
> +/* PHY strobe pad settings */
> +#define PHY_STBPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x0a)
> +
> +/* PHY reset pad settings */
> +#define PHY_RSTNPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x0c)
> +
> +/* Bitfields are common for all pad settings */
> +#define PHY_PAD_RXSEL_1V8		0x1 /* Receiver type select for 1.8V */
> +#define PHY_PAD_RXSEL_3V3		0x2 /* Receiver type select for 3.3V */
> +
> +#define PHY_PAD_WEAKPULL_MASK		GENMASK(4, 3) /* bits [4:3] */
> +#define PHY_PAD_WEAKPULL_PULLUP		0x1 /* Weak pull down enabled */

down -> up ?

> +#define PHY_PAD_WEAKPULL_PULLDOWN	0x2 /* Weak pull down enabled */
> +
> +#define PHY_PAD_TXSLEW_CTRL_P_MASK	GENMASK(8, 5) /* bits [8:5] */
> +#define PHY_PAD_TXSLEW_CTRL_P		0x3 /* Slew control for P-Type pad TX */
> +#define PHY_PAD_TXSLEW_CTRL_N_MASK	GENMASK(12, 9) /* bits [12:9] */
> +#define PHY_PAD_TXSLEW_CTRL_N		0x3 /* Slew control for N-Type pad TX */
> +
> +/* PHY CLK delay line settings */
> +#define PHY_SDCLKDL_CNFG_R		(DWC_MSHC_PTR_PHY_R + 0x1d)
> +#define PHY_SDCLKDL_CNFG_UPDATE	BIT(4) /* set before writing to SDCLKDL_DC */
> +
> +/* PHY CLK delay line delay code */
> +#define PHY_SDCLKDL_DC_R		(DWC_MSHC_PTR_PHY_R + 0x1e)
> +#define PHY_SDCLKDL_DC_INITIAL		0x40 /* initial delay code */
> +#define PHY_SDCLKDL_DC_DEFAULT		0x32 /* default delay code */
> +#define PHY_SDCLKDL_DC_HS400		0x18 /* delay code for HS400 mode */
> +
> +/* PHY drift_cclk_rx delay line configuration setting */
> +#define PHY_ATDL_CNFG_R			(DWC_MSHC_PTR_PHY_R + 0x21)
> +#define PHY_ATDL_CNFG_INPSEL_MASK	GENMASK(3, 2) /* bits [3:2] */
> +#define PHY_ATDL_CNFG_INPSEL		0x3 /* delay line input source */
> +
> +/* PHY DLL control settings */
> +#define PHY_DLL_CTRL_R			(DWC_MSHC_PTR_PHY_R + 0x24)
> +#define PHY_DLL_CTRL_DISABLE		0x0 /* PHY DLL is enabled */
> +#define PHY_DLL_CTRL_ENABLE		0x1 /* PHY DLL is disabled */
> +
> +/* PHY DLL  configuration register 1 */
> +#define PHY_DLL_CNFG1_R			(DWC_MSHC_PTR_PHY_R + 0x25)
> +#define PHY_DLL_CNFG1_SLVDLY_MASK	GENMASK(5, 4) /* bits [5:4] */
> +#define PHY_DLL_CNFG1_SLVDLY		0x2 /* DLL slave update delay input */
> +#define PHY_DLL_CNFG1_WAITCYCLE		0x5 /* DLL wait cycle input */
> +
> +/* PHY DLL configuration register 2 */
> +#define PHY_DLL_CNFG2_R			(DWC_MSHC_PTR_PHY_R + 0x26)
> +#define PHY_DLL_CNFG2_JUMPSTEP		0xa /* DLL jump step input */
> +
> +/* PHY DLL master and slave delay line configuration settings */
> +#define PHY_DLLDL_CNFG_R		(DWC_MSHC_PTR_PHY_R + 0x28)
> +#define PHY_DLLDL_CNFG_SLV_INPSEL_MASK	GENMASK(6, 5) /* bits [6:5] */
> +#define PHY_DLLDL_CNFG_SLV_INPSEL	0x3 /* clock source select for slave DL */
> +
> +#define FLAG_IO_FIXED_1V8	BIT(0)
> +
>  #define BOUNDARY_OK(addr, len) \
>  	((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1)))
>  
> @@ -92,6 +184,8 @@ struct dwcmshc_priv {
>  	struct clk	*bus_clk;
>  	int vendor_specific_area1; /* P_VENDOR_SPECIFIC_AREA reg */
>  	void *priv; /* pointer to SoC private stuff */
> +	u16 delay_line;
> +	u16 flags;
>  };
>  
>  /*
> @@ -157,6 +251,129 @@ static void dwcmshc_request(struct mmc_host *mmc, struct mmc_request *mrq)
>  	sdhci_request(mmc, mrq);
>  }
>  
> +static void th1520_phy_1_8v_init(struct sdhci_host *host)
> +{
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> +	u32 val;
> +
> +	if (!priv)
> +		return;
> +
> +	/* deassert phy reset & set tx drive strength */
> +	val = PHY_CNFG_RSTN_DEASSERT;
> +	val |= FIELD_PREP(PHY_CNFG_PAD_SP_MASK, PHY_CNFG_PAD_SP);
> +	val |= FIELD_PREP(PHY_CNFG_PAD_SN_MASK, PHY_CNFG_PAD_SN);
> +	sdhci_writel(host, val, PHY_CNFG_R);
> +
> +	/* disable delay line */
> +	sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE, PHY_SDCLKDL_CNFG_R);
> +
> +	/* set delay line */
> +	sdhci_writeb(host, priv->delay_line, PHY_SDCLKDL_DC_R);
> +	sdhci_writeb(host, PHY_DLL_CNFG2_JUMPSTEP, PHY_DLL_CNFG2_R);
> +
> +	/* enable delay lane */
> +	val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R);
> +	val &= ~(PHY_SDCLKDL_CNFG_UPDATE);
> +	sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R);
> +
> +	/* configure phy pads */
> +	val = PHY_PAD_RXSEL_1V8;
> +	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLUP);
> +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> +	sdhci_writew(host, val, PHY_CMDPAD_CNFG_R);
> +	sdhci_writew(host, val, PHY_DATAPAD_CNFG_R);
> +	sdhci_writew(host, val, PHY_RSTNPAD_CNFG_R);
> +
> +	val = FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> +	sdhci_writew(host, val, PHY_CLKPAD_CNFG_R);
> +
> +	val = PHY_PAD_RXSEL_1V8;
> +	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLDOWN);
> +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> +	sdhci_writew(host, val, PHY_STBPAD_CNFG_R);
> +
> +	/* enable data strobe mode */
> +	sdhci_writeb(host, FIELD_PREP(PHY_DLLDL_CNFG_SLV_INPSEL_MASK, PHY_DLLDL_CNFG_SLV_INPSEL),
> +		     PHY_DLLDL_CNFG_R);
> +
> +	/* enable phy dll */
> +	sdhci_writeb(host, PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R);
> +}
> +
> +static void th1520_phy_3_3v_init(struct sdhci_host *host)
> +{
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> +	u32 val;
> +
> +	/* deassert phy reset & set tx drive strength */
> +	val = PHY_CNFG_RSTN_DEASSERT;
> +	val |= FIELD_PREP(PHY_CNFG_PAD_SP_MASK, PHY_CNFG_PAD_SP);
> +	val |= FIELD_PREP(PHY_CNFG_PAD_SN_MASK, PHY_CNFG_PAD_SN);
> +	sdhci_writel(host, val, PHY_CNFG_R);
> +
> +	/* disable delay line */
> +	sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE, PHY_SDCLKDL_CNFG_R);
> +
> +	/* set delay line */
> +	sdhci_writeb(host, priv->delay_line, PHY_SDCLKDL_DC_R);
> +	sdhci_writeb(host, PHY_DLL_CNFG2_JUMPSTEP, PHY_DLL_CNFG2_R);
> +
> +	/* enable delay lane */
> +	val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R);
> +	val &= ~(PHY_SDCLKDL_CNFG_UPDATE);
> +	sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R);
> +
> +	/* configure phy pads */
> +	val = PHY_PAD_RXSEL_3V3;
> +	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLUP);
> +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> +	sdhci_writew(host, val, PHY_CMDPAD_CNFG_R);
> +	sdhci_writew(host, val, PHY_DATAPAD_CNFG_R);
> +	sdhci_writew(host, val, PHY_RSTNPAD_CNFG_R);
> +
> +	val = FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> +	sdhci_writew(host, val, PHY_CLKPAD_CNFG_R);
> +
> +	val = PHY_PAD_RXSEL_3V3;
> +	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLDOWN);
> +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
> +	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
> +	sdhci_writew(host, val, PHY_STBPAD_CNFG_R);
> +
> +	/* enable phy dll */
> +	sdhci_writeb(host, PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R);
> +}
> +
> +static void th1520_sdhci_set_phy(struct sdhci_host *host)
> +{
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> +	u16 emmc_ctrl;
> +
> +	/* Before power on, set PHY configs */
> +	if (priv->flags & FLAG_IO_FIXED_1V8)
> +		th1520_phy_1_8v_init(host);
> +	else
> +		th1520_phy_3_3v_init(host);
> +
> +	if (host->mmc->caps & MMC_CAP_NONREMOVABLE) {
> +		emmc_ctrl = sdhci_readw(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_CONTROL);
> +		emmc_ctrl |= DWCMSHC_CARD_IS_EMMC;
> +		sdhci_writew(host, emmc_ctrl, priv->vendor_specific_area1 + DWCMSHC_EMMC_CONTROL);
> +	}
> +
> +	sdhci_writeb(host, FIELD_PREP(PHY_DLL_CNFG1_SLVDLY_MASK, PHY_DLL_CNFG1_SLVDLY) |
> +		     PHY_DLL_CNFG1_WAITCYCLE, PHY_DLL_CNFG1_R);
> +}
> +
>  static void dwcmshc_set_uhs_signaling(struct sdhci_host *host,
>  				      unsigned int timing)
>  {
> @@ -189,9 +406,26 @@ static void dwcmshc_set_uhs_signaling(struct sdhci_host *host,
>  		ctrl_2 |= DWCMSHC_CTRL_HS400;
>  	}
>  
> +	if (priv->flags & FLAG_IO_FIXED_1V8)
> +		ctrl_2 |= SDHCI_CTRL_VDD_180;
>  	sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
>  }
>  
> +static void th1520_set_uhs_signaling(struct sdhci_host *host,
> +				     unsigned int timing)
> +{
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> +
> +	dwcmshc_set_uhs_signaling(host, timing);
> +	if (timing == MMC_TIMING_MMC_HS400) {
> +		priv->delay_line = PHY_SDCLKDL_DC_HS400;
> +		th1520_sdhci_set_phy(host);
> +	} else {
> +		sdhci_writeb(host, 0, PHY_DLLDL_CNFG_R);
> +	}
> +}
> +
>  static void dwcmshc_hs400_enhanced_strobe(struct mmc_host *mmc,
>  					  struct mmc_ios *ios)
>  {
> @@ -338,6 +572,85 @@ static void rk35xx_sdhci_reset(struct sdhci_host *host, u8 mask)
>  	sdhci_reset(host, mask);
>  }
>  
> +static int th1520_execute_tuning(struct sdhci_host *host, u32 opcode)
> +{
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> +	u32 val = 0;
> +
> +	if (host->flags & SDHCI_HS400_TUNING)
> +		return 0;
> +
> +	sdhci_writeb(host, FIELD_PREP(PHY_ATDL_CNFG_INPSEL_MASK, PHY_ATDL_CNFG_INPSEL),
> +		     PHY_ATDL_CNFG_R);
> +	val = sdhci_readl(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL);
> +
> +	/*
> +	 * configure tuning settings:
> +	 *  - center phase select code driven in block gap interval
> +	 *  - disable reporting of framing errors
> +	 *  - disable software managed tuning
> +	 *  - disable user selection of sampling window edges,
> +	 *    instead tuning calculated edges are used
> +	 */
> +	val &= ~(AT_CTRL_CI_SEL | AT_CTRL_RPT_TUNE_ERR | AT_CTRL_SW_TUNE_EN |
> +		 FIELD_PREP(AT_CTRL_WIN_EDGE_SEL_MASK, AT_CTRL_WIN_EDGE_SEL));
> +
> +	/*
> +	 * configure tuning settings:
> +	 *  - enable auto-tuning
> +	 *  - enable sampling window threshold
> +	 *  - stop clocks during phase code change
> +	 *  - set max latency in cycles between tx and rx clocks
> +	 *  - set max latency in cycles to switch output phase
> +	 *  - set max sampling window threshold value
> +	 */
> +	val |= AT_CTRL_AT_EN | AT_CTRL_SWIN_TH_EN | AT_CTRL_TUNE_CLK_STOP_EN;
> +	val |= FIELD_PREP(AT_CTRL_PRE_CHANGE_DLY_MASK, AT_CTRL_PRE_CHANGE_DLY);
> +	val |= FIELD_PREP(AT_CTRL_POST_CHANGE_DLY_MASK, AT_CTRL_POST_CHANGE_DLY);
> +	val |= FIELD_PREP(AT_CTRL_SWIN_TH_VAL_MASK, AT_CTRL_SWIN_TH_VAL);
> +
> +	sdhci_writel(host, val, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL);
> +	val = sdhci_readl(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL);
> +
> +	/* check if is possible to enable auto-tuning */
> +	if (!(val & AT_CTRL_AT_EN)) {
> +		dev_err(mmc_dev(host->mmc), "failed to enable auto tuning\n");
> +		return -EIO;
> +	}
> +
> +	/* perform tuning */
> +	sdhci_start_tuning(host);
> +	host->tuning_err = __sdhci_execute_tuning(host, opcode);
> +	if (host->tuning_err) {
> +		/* disable auto-tuning upon tuning error */
> +		val &= ~AT_CTRL_AT_EN;
> +		sdhci_writel(host, val, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL);
> +		dev_err(mmc_dev(host->mmc), "tuning failed: %d\n", host->tuning_err);
> +		return -EIO;
> +	}
> +	sdhci_end_tuning(host);
> +
> +	return 0;
> +}
> +
> +static void th1520_sdhci_reset(struct sdhci_host *host, u8 mask)
> +{
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> +	u16 ctrl_2;
> +
> +	sdhci_reset(host, mask);
> +
> +	if (priv->flags & FLAG_IO_FIXED_1V8) {
> +		ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
> +		if (!(ctrl_2 & SDHCI_CTRL_VDD_180)) {
> +			ctrl_2 |= SDHCI_CTRL_VDD_180;
> +			sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
> +		}
> +	}
> +}
> +
>  static const struct sdhci_ops sdhci_dwcmshc_ops = {
>  	.set_clock		= sdhci_set_clock,
>  	.set_bus_width		= sdhci_set_bus_width,
> @@ -356,6 +669,17 @@ static const struct sdhci_ops sdhci_dwcmshc_rk35xx_ops = {
>  	.adma_write_desc	= dwcmshc_adma_write_desc,
>  };
>  
> +static const struct sdhci_ops sdhci_dwcmshc_th1520_ops = {
> +	.set_clock		= sdhci_set_clock,
> +	.set_bus_width		= sdhci_set_bus_width,
> +	.set_uhs_signaling	= th1520_set_uhs_signaling,
> +	.get_max_clock		= dwcmshc_get_max_clock,
> +	.reset			= th1520_sdhci_reset,
> +	.adma_write_desc	= dwcmshc_adma_write_desc,
> +	.voltage_switch		= th1520_phy_1_8v_init,
> +	.platform_execute_tuning = &th1520_execute_tuning,
> +};
> +
>  static const struct sdhci_pltfm_data sdhci_dwcmshc_pdata = {
>  	.ops = &sdhci_dwcmshc_ops,
>  	.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
> @@ -379,6 +703,12 @@ static const struct sdhci_pltfm_data sdhci_dwcmshc_rk35xx_pdata = {
>  		   SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
>  };
>  
> +static const struct sdhci_pltfm_data sdhci_dwcmshc_th1520_pdata = {
> +	.ops = &sdhci_dwcmshc_th1520_ops,
> +	.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
> +	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
> +};
> +
>  static int dwcmshc_rk35xx_init(struct sdhci_host *host, struct dwcmshc_priv *dwc_priv)
>  {
>  	int err;
> @@ -447,6 +777,10 @@ static const struct of_device_id sdhci_dwcmshc_dt_ids[] = {
>  		.compatible = "snps,dwcmshc-sdhci",
>  		.data = &sdhci_dwcmshc_pdata,
>  	},
> +	{
> +		.compatible = "thead,th1520-dwcmshc",
> +		.data = &sdhci_dwcmshc_th1520_pdata,
> +	},
>  	{},
>  };
>  MODULE_DEVICE_TABLE(of, sdhci_dwcmshc_dt_ids);
> @@ -542,6 +876,30 @@ static int dwcmshc_probe(struct platform_device *pdev)
>  			goto err_clk;
>  	}
>  
> +	if (pltfm_data == &sdhci_dwcmshc_th1520_pdata) {
> +		priv->delay_line = PHY_SDCLKDL_DC_DEFAULT;
> +
> +		if ((device_property_read_bool(dev, "mmc-ddr-1_8v")) |
> +		    (device_property_read_bool(dev, "mmc-hs200-1_8v")) |
> +		    (device_property_read_bool(dev, "mmc-hs400-1_8v")))
> +			priv->flags |= FLAG_IO_FIXED_1V8;
> +		else
> +			priv->flags &= ~FLAG_IO_FIXED_1V8;
> +
> +		/*
> +		 * start_signal_voltage_switch() will try 3.3V first
> +		 * then 1.8V. Use SDHCI_SIGNALING_180 ranther than

ranther -> rather

> +		 * SDHCI_SIGNALING_330 to avoid setting voltage to 3.3V
> +		 * in sdhci_start_signal_voltage_switch().
> +		 */
> +		if (priv->flags & FLAG_IO_FIXED_1V8) {
> +			host->flags &= ~SDHCI_SIGNALING_330;
> +			host->flags |=  SDHCI_SIGNALING_180;
> +		}
> +
> +		sdhci_enable_v4_mode(host);
> +	}
> +
>  #ifdef CONFIG_ACPI
>  	if (pltfm_data == &sdhci_dwcmshc_bf3_pdata)
>  		sdhci_enable_v4_mode(host);
> 


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[PATCH v2 4/7] riscv: defconfig: Enable mmc and dma drivers for T-Head TH1520

[Drew Fustini]

Enable the mmc controller driver and dma controller driver needed for
T-Head TH1520 based boards, like the LicheePi 4A and BeagleV-Ahead, to
boot from eMMC storage.

Signed-off-by: Drew Fustini <dfustini@baylibre.com>
---
 arch/riscv/configs/defconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/riscv/configs/defconfig b/arch/riscv/configs/defconfig
index ab86ec3b9eab..c5a8583236d0 100644
--- a/arch/riscv/configs/defconfig
+++ b/arch/riscv/configs/defconfig
@@ -168,12 +168,14 @@ CONFIG_MMC=y
 CONFIG_MMC_SDHCI=y
 CONFIG_MMC_SDHCI_PLTFM=y
 CONFIG_MMC_SDHCI_CADENCE=y
+CONFIG_MMC_SDHCI_OF_DWCMSHC=y
 CONFIG_MMC_SPI=y
 CONFIG_MMC_SUNXI=y
 CONFIG_RTC_CLASS=y
 CONFIG_RTC_DRV_SUN6I=y
 CONFIG_DMADEVICES=y
 CONFIG_DMA_SUN6I=m
+CONFIG_DW_AXI_DMAC=y
 CONFIG_VIRTIO_PCI=y
 CONFIG_VIRTIO_BALLOON=y
 CONFIG_VIRTIO_INPUT=y

-- 
2.34.1


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Re: [PATCH v2 4/7] riscv: defconfig: Enable mmc and dma drivers for T-Head TH1520

[Guo Ren]

On Wed, Oct 18, 2023 at 4:45 AM Drew Fustini <dfustini@baylibre.com> wrote:
>
> Enable the mmc controller driver and dma controller driver needed for
> T-Head TH1520 based boards, like the LicheePi 4A and BeagleV-Ahead, to
> boot from eMMC storage.
Yes, it's necessary to add this config for th1520.

Reviewed-by: Guo Ren <guoren@kernel.org>

>
> Signed-off-by: Drew Fustini <dfustini@baylibre.com>
> ---
>  arch/riscv/configs/defconfig | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/arch/riscv/configs/defconfig b/arch/riscv/configs/defconfig
> index ab86ec3b9eab..c5a8583236d0 100644
> --- a/arch/riscv/configs/defconfig
> +++ b/arch/riscv/configs/defconfig
> @@ -168,12 +168,14 @@ CONFIG_MMC=y
>  CONFIG_MMC_SDHCI=y
>  CONFIG_MMC_SDHCI_PLTFM=y
>  CONFIG_MMC_SDHCI_CADENCE=y
> +CONFIG_MMC_SDHCI_OF_DWCMSHC=y
>  CONFIG_MMC_SPI=y
>  CONFIG_MMC_SUNXI=y
>  CONFIG_RTC_CLASS=y
>  CONFIG_RTC_DRV_SUN6I=y
>  CONFIG_DMADEVICES=y
>  CONFIG_DMA_SUN6I=m
> +CONFIG_DW_AXI_DMAC=y
>  CONFIG_VIRTIO_PCI=y
>  CONFIG_VIRTIO_BALLOON=y
>  CONFIG_VIRTIO_INPUT=y
>
> --
> 2.34.1
>


-- 
Best Regards
 Guo Ren

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[PATCH v2 5/7] riscv: dts: thead: Add TH1520 mmc controller and sdhci clock

[Drew Fustini]

Add nodes for the SDHCI fixed clock and the first mmc controller which
is typically connected to the eMMC device.

Signed-off-by: Drew Fustini <dfustini@baylibre.com>
---
 arch/riscv/boot/dts/thead/th1520.dtsi | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/riscv/boot/dts/thead/th1520.dtsi b/arch/riscv/boot/dts/thead/th1520.dtsi
index ff364709a6df..ee0711352790 100644
--- a/arch/riscv/boot/dts/thead/th1520.dtsi
+++ b/arch/riscv/boot/dts/thead/th1520.dtsi
@@ -134,6 +134,13 @@ uart_sclk: uart-sclk-clock {
 		#clock-cells = <0>;
 	};
 
+	sdhci_clk: sdhci-clock {
+		compatible = "fixed-clock";
+		clock-frequency = <198000000>;
+		clock-output-names = "sdhci_clk";
+		#clock-cells = <0>;
+	};
+
 	soc {
 		compatible = "simple-bus";
 		interrupt-parent = <&plic>;
@@ -292,6 +299,14 @@ dmac0: dma-controller@ffefc00000 {
 			status = "disabled";
 		};
 
+		mmc0: mmc@ffe7080000 {
+			compatible = "thead,th1520-dwcmshc";
+			reg = <0xff 0xe7080000 0x0 0x10000>;
+			interrupts = <62 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&sdhci_clk>;
+			clock-names = "core";
+		};
+
 		timer0: timer@ffefc32000 {
 			compatible = "snps,dw-apb-timer";
 			reg = <0xff 0xefc32000 0x0 0x14>;

-- 
2.34.1


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[PATCH v2 6/7] riscv: dts: thead: Enable BeagleV Ahead eMMC controller

[Drew Fustini]

Add properties to the emmc node and enable it and set the frequency for
the sdhci clock.

Signed-off-by: Drew Fustini <dfustini@baylibre.com>
---
 arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts b/arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts
index 70e8042c8304..bf55319ba950 100644
--- a/arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts
+++ b/arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts
@@ -52,6 +52,10 @@ &uart_sclk {
 	clock-frequency = <100000000>;
 };
 
+&sdhci_clk {
+	clock-frequency = <198000000>;
+};
+
 &dmac0 {
 	status = "okay";
 };
@@ -59,3 +63,13 @@ &dmac0 {
 &uart0 {
 	status = "okay";
 };
+
+&mmc0 {
+	bus-width = <8>;
+	max-frequency = <198000000>;
+	mmc-hs400-1_8v;
+	non-removable;
+	no-sdio;
+	no-sd;
+	status = "okay";
+};

-- 
2.34.1


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Re: [PATCH v2 6/7] riscv: dts: thead: Enable BeagleV Ahead eMMC controller

[Conor Dooley]

[-- Attachment #1.1: Type: text/plain, Size: 1110 bytes --]

On Tue, Oct 17, 2023 at 01:43:52PM -0700, Drew Fustini wrote:
> Add properties to the emmc node and enable it and set the frequency for
> the sdhci clock.
> 
> Signed-off-by: Drew Fustini <dfustini@baylibre.com>
> ---
>  arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts b/arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts
> index 70e8042c8304..bf55319ba950 100644
> --- a/arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts
> +++ b/arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts
> @@ -52,6 +52,10 @@ &uart_sclk {
>  	clock-frequency = <100000000>;
>  };
>  
> +&sdhci_clk {
> +	clock-frequency = <198000000>;
> +};
> +
>  &dmac0 {
>  	status = "okay";
>  };
> @@ -59,3 +63,13 @@ &dmac0 {
>  &uart0 {
>  	status = "okay";
>  };
> +
> +&mmc0 {
> +	bus-width = <8>;
> +	max-frequency = <198000000>;
> +	mmc-hs400-1_8v;
> +	non-removable;
> +	no-sdio;
> +	no-sd;
> +	status = "okay";
> +};

Is this file meant to be in alphanumerical order?


[-- Attachment #1.2: signature.asc --]
[-- Type: application/pgp-signature, Size: 228 bytes --]

[-- Attachment #2: Type: text/plain, Size: 161 bytes --]

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Re: [PATCH v2 6/7] riscv: dts: thead: Enable BeagleV Ahead eMMC controller

[Drew Fustini]

On Wed, Oct 18, 2023 at 02:57:50PM +0100, Conor Dooley wrote:
> On Tue, Oct 17, 2023 at 01:43:52PM -0700, Drew Fustini wrote:
> > Add properties to the emmc node and enable it and set the frequency for
> > the sdhci clock.
> > 
> > Signed-off-by: Drew Fustini <dfustini@baylibre.com>
> > ---
> >  arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts | 14 ++++++++++++++
> >  1 file changed, 14 insertions(+)
> > 
> > diff --git a/arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts b/arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts
> > index 70e8042c8304..bf55319ba950 100644
> > --- a/arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts
> > +++ b/arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts
> > @@ -52,6 +52,10 @@ &uart_sclk {
> >  	clock-frequency = <100000000>;
> >  };
> >  
> > +&sdhci_clk {
> > +	clock-frequency = <198000000>;
> > +};
> > +
> >  &dmac0 {
> >  	status = "okay";
> >  };
> > @@ -59,3 +63,13 @@ &dmac0 {
> >  &uart0 {
> >  	status = "okay";
> >  };
> > +
> > +&mmc0 {
> > +	bus-width = <8>;
> > +	max-frequency = <198000000>;
> > +	mmc-hs400-1_8v;
> > +	non-removable;
> > +	no-sdio;
> > +	no-sd;
> > +	status = "okay";
> > +};
> 
> Is this file meant to be in alphanumerical order?
> 

Good point, I should add the new nodes in alphabetical order.

Thanks,
Drew

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[PATCH v2 7/7] riscv: dts: thead: Enable LicheePi 4A eMMC controller

[Drew Fustini]

Add properties to the emmc node and enable it and set the frequency for
the sdhci clock.

Signed-off-by: Drew Fustini <dfustini@baylibre.com>
---
 arch/riscv/boot/dts/thead/th1520-lichee-module-4a.dtsi | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/riscv/boot/dts/thead/th1520-lichee-module-4a.dtsi b/arch/riscv/boot/dts/thead/th1520-lichee-module-4a.dtsi
index a802ab110429..bc8f111571bc 100644
--- a/arch/riscv/boot/dts/thead/th1520-lichee-module-4a.dtsi
+++ b/arch/riscv/boot/dts/thead/th1520-lichee-module-4a.dtsi
@@ -29,6 +29,10 @@ &apb_clk {
 	clock-frequency = <62500000>;
 };
 
+&sdhci_clk {
+	clock-frequency = <198000000>;
+};
+
 &uart_sclk {
 	clock-frequency = <100000000>;
 };
@@ -36,3 +40,13 @@ &uart_sclk {
 &dmac0 {
 	status = "okay";
 };
+
+&mmc0 {
+	bus-width = <8>;
+	max-frequency = <198000000>;
+	mmc-hs400-1_8v;
+	non-removable;
+	no-sdio;
+	no-sd;
+	status = "okay";
+};

-- 
2.34.1


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