Re: [PATCH v4 2/2] mmc: sdhci-of-ma35d1: Add Nuvoton MA35D1 SDHCI driver

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Dear Krzysztof,

Thank you for your review.

On 2024/7/8 下午 10:25, Krzysztof Kozlowski wrote:
On 04/07/2024 08:26, Shan-Chun Hung wrote:
Add the SDHCI driver for the MA35D1 platform. It is based upon the
SDHCI interface, but requires some extra initialization.

Signed-off-by: Shan-Chun Hung <shanchun1218@xxxxxxxxx>
---
  drivers/mmc/host/Kconfig           |  12 ++
  drivers/mmc/host/Makefile          |   1 +
  drivers/mmc/host/sdhci-of-ma35d1.c | 297 +++++++++++++++++++++++++++++
  3 files changed, 310 insertions(+)
  create mode 100644 drivers/mmc/host/sdhci-of-ma35d1.c

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index bb0d4fb0892a..aa6922ff4210 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -252,6 +252,18 @@ config MMC_SDHCI_OF_SPARX5

  	  If unsure, say N.

+config MMC_SDHCI_OF_MA35D1
+	tristate "SDHCI OF support for the MA35D1 SDHCI controller"
+	depends on ARCH_MA35 || COMPILE_TEST
+	depends on MMC_SDHCI_PLTFM
+	help
+	  This selects the MA35D1 Secure Digital Host Controller Interface.
+	  The controller supports SD/MMC/SDIO devices.
+
+	  If you have a controller with this interface, say Y or M here.
+
+	  If unsure, say N.
+
  config MMC_SDHCI_CADENCE
  	tristate "SDHCI support for the Cadence SD/SDIO/eMMC controller"
  	depends on MMC_SDHCI_PLTFM
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index f53f86d200ac..3ccffebbe59b 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -88,6 +88,7 @@ obj-$(CONFIG_MMC_SDHCI_OF_ESDHC)	+= sdhci-of-esdhc.o
  obj-$(CONFIG_MMC_SDHCI_OF_HLWD)		+= sdhci-of-hlwd.o
  obj-$(CONFIG_MMC_SDHCI_OF_DWCMSHC)	+= sdhci-of-dwcmshc.o
  obj-$(CONFIG_MMC_SDHCI_OF_SPARX5)	+= sdhci-of-sparx5.o
+obj-$(CONFIG_MMC_SDHCI_OF_MA35D1)	+= sdhci-of-ma35d1.o
  obj-$(CONFIG_MMC_SDHCI_BCM_KONA)	+= sdhci-bcm-kona.o
  obj-$(CONFIG_MMC_SDHCI_IPROC)		+= sdhci-iproc.o
  obj-$(CONFIG_MMC_SDHCI_NPCM)		+= sdhci-npcm.o
diff --git a/drivers/mmc/host/sdhci-of-ma35d1.c b/drivers/mmc/host/sdhci-of-ma35d1.c
new file mode 100644
index 000000000000..b5aab65b9093
--- /dev/null
+++ b/drivers/mmc/host/sdhci-of-ma35d1.c
@@ -0,0 +1,297 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2024 Nuvoton Technology Corp.
+ *
+ * Author: Shan-Chun Hung <shanchun1218@xxxxxxxxx>
+ */
+
+#include <linux/align.h>
+#include <linux/array_size.h>
+#include <linux/bits.h>
+#include <linux/build_bug.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/dev_printk.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/math.h>
+#include <linux/mfd/syscon.h>
+#include <linux/minmax.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/host.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <linux/sizes.h>
+#include <linux/types.h>
+
+#include "sdhci-pltfm.h"
+#include "sdhci.h"
+
+#define MA35_SYS_MISCFCR0	0x070
+#define MA35_SDHCI_MSHCCTL	0x508
+#define MA35_SDHCI_MBIUCTL	0x510
+
+#define MA35_SDHCI_CMD_CONFLICT_CHK	BIT(0)
+#define MA35_SDHCI_INCR_MSK		GENMASK(3, 0)
+#define MA35_SDHCI_INCR16		BIT(3)
+#define MA35_SDHCI_INCR8		BIT(2)
+
+struct ma35_priv {
+	struct regmap		*regmap;
Drop, you don't use it.
I will remove it and use local variables instead.

+	struct reset_control	*rst;
+	struct pinctrl		*pinctrl;
+	struct pinctrl_state	*pins_uhs;
+	struct pinctrl_state	*pins_default;
+};
+
+struct ma35_restore_data {
+	u32	reg;
+	u32	width;
+};
+
...

+
+static int ma35_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct sdhci_pltfm_host *pltfm_host;
+	struct sdhci_host *host;
+	struct ma35_priv *priv;
+	int err;
+	u32 extra, ctl;
+
+	host = sdhci_pltfm_init(pdev, &sdhci_ma35_pdata, sizeof(struct ma35_priv));
+	if (IS_ERR(host))
+		return PTR_ERR(host);
+
+	/* Extra adma table cnt for cross 128M boundary handling. */
+	extra = DIV_ROUND_UP_ULL(dma_get_required_mask(dev), SZ_128M);
+	extra = min(extra, SDHCI_MAX_SEGS);
+
+	host->adma_table_cnt += extra;
+	pltfm_host = sdhci_priv(host);
+	priv = sdhci_pltfm_priv(pltfm_host);
+
+	pltfm_host->clk = devm_clk_get_optional_enabled(dev, NULL);
+	if (IS_ERR(pltfm_host->clk)) {
+		err = PTR_ERR(pltfm_host->clk);
+		dev_err_probe(dev, err, "failed to get clk\n");
Syntax is err = dev_err_probe()
I will fix it.
+		goto err_sdhci;
+	}
+
+	err = mmc_of_parse(host->mmc);
+	if (err)
+		goto err_sdhci;
+
+	priv->rst = devm_reset_control_get_exclusive(dev, NULL);
+	if (IS_ERR(priv->rst)) {
+		err = PTR_ERR(priv->rst);
+		dev_err_probe(dev, err, "failed to get reset control\n");
err = dev_err_probe

... so all your previous versions were leaking memory. Double check your
error paths.
I will fix it and make sure to double check the error paths.
+		goto err_sdhci;
+	}
+
+	sdhci_get_of_property(pdev);
+
Best regards,
Krzysztof

Best Regards,

Shan-Chun





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