linux-kernel - [RFC PATCH 2/3] mmc: sdhci-esdhc-imx: add NXP S32G2 support

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Message-ID: <20211021071333.32485-3-clin@suse.com>
Date:   Thu, 21 Oct 2021 15:13:32 +0800
From:   Chester Lin <clin@...e.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>, s32@....com,
        NXP Linux Team <linux-imx@....com>,
        BOUGH CHEN <haibo.chen@....com>,
        Dong Aisheng <aisheng.dong@....com>, linux-mmc@...r.kernel.org
CC:     Rob Herring <robh+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Radu Nicolae Pirea <radu-nicolae.pirea@....nxp.com>,
        Andreas Färber <afaerber@...e.de>,
        Matthias Brugger <mbrugger@...e.com>,
        "Ivan T . Ivanov" <iivanov@...e.de>,
        "Lee, Chun-Yi" <jlee@...e.com>, Chester Lin <clin@...e.com>
Subject: [RFC PATCH 2/3] mmc: sdhci-esdhc-imx: add NXP S32G2 support

Support the SDHCI controller found on NXP S32G2 platform. The new flag
ESDHC_FLAG_SKIP_ERR004536 is used because the hardware erratum bit is not
applicable for S32G2.

Signed-off-by: Chester Lin <clin@...e.com>
---
 drivers/mmc/host/sdhci-esdhc-imx.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index f18d169bc8ff..d0f7d46a0354 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -196,6 +196,9 @@
  */
 #define ESDHC_FLAG_BROKEN_AUTO_CMD23	BIT(16)
 
+/* ERR004536 is not applicable for the IP  */
+#define ESDHC_FLAG_SKIP_ERR004536	BIT(17)
+
 enum wp_types {
 	ESDHC_WP_NONE,		/* no WP, neither controller nor gpio */
 	ESDHC_WP_CONTROLLER,	/* mmc controller internal WP */
@@ -289,6 +292,13 @@ static const struct esdhc_soc_data usdhc_imx7d_data = {
 			| ESDHC_FLAG_BROKEN_AUTO_CMD23,
 };
 
+static struct esdhc_soc_data usdhc_s32g2_data = {
+	.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_MAN_TUNING
+			| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
+			| ESDHC_FLAG_HS400 | ESDHC_FLAG_HS400_ES
+			| ESDHC_FLAG_SKIP_ERR004536,
+};
+
 static struct esdhc_soc_data usdhc_imx7ulp_data = {
 	.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
 			| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
@@ -347,6 +357,7 @@ static const struct of_device_id imx_esdhc_dt_ids[] = {
 	{ .compatible = "fsl,imx7ulp-usdhc", .data = &usdhc_imx7ulp_data, },
 	{ .compatible = "fsl,imx8qxp-usdhc", .data = &usdhc_imx8qxp_data, },
 	{ .compatible = "fsl,imx8mm-usdhc", .data = &usdhc_imx8mm_data, },
+	{ .compatible = "nxp,s32g2-usdhc", .data = &usdhc_s32g2_data, },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, imx_esdhc_dt_ids);
@@ -1359,8 +1370,10 @@ static void sdhci_esdhc_imx_hwinit(struct sdhci_host *host)
 		 * erratum ESDHC_FLAG_ERR004536 fix for MX6Q TO1.2 and MX6DL
 		 * TO1.1, it's harmless for MX6SL
 		 */
-		writel(readl(host->ioaddr + 0x6c) & ~BIT(7),
-			host->ioaddr + 0x6c);
+		if (!(imx_data->socdata->flags & ESDHC_FLAG_SKIP_ERR004536)) {
+			writel(readl(host->ioaddr + 0x6c) & ~BIT(7),
+				host->ioaddr + 0x6c);
+		}
 
 		/* disable DLL_CTRL delay line settings */
 		writel(0x0, host->ioaddr + ESDHC_DLL_CTRL);
-- 
2.30.0