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Message-ID: <30cb5871-71f1-4b62-91fc-489519125bc2@kernel.org>
Date: Mon, 8 Jul 2024 16:25:09 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Shan-Chun Hung <shanchun1218@...il.com>, ulf.hansson@...aro.org,
robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
adrian.hunter@...el.com, p.zabel@...gutronix.de, pbrobinson@...il.com,
serghox@...il.com, mcgrof@...nel.org,
prabhakar.mahadev-lad.rj@...renesas.com, forbidden405@...look.com,
tmaimon77@...il.com, andy.shevchenko@...il.com,
linux-arm-kernel@...ts.infradead.org, linux-mmc@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: ychuang3@...oton.com, schung@...oton.com
Subject: Re: [PATCH v4 2/2] mmc: sdhci-of-ma35d1: Add Nuvoton MA35D1 SDHCI
driver
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@...il.com>
> ---
> 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@...il.com>
> + */
> +
> +#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.
> + 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()
> + 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.
> + goto err_sdhci;
> + }
> +
> + sdhci_get_of_property(pdev);
> +
Best regards,
Krzysztof
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