[PATCH linux dev-5.15 v1 2/2] mmc: host: Add support for NPCM SDHCI controller

[Tomer Maimon]

This patch adds NPCM SDHCI controller driver support to NPCM BMC SoC.

Signed-off-by: Tomer Maimon <tmaimon77 at gmail.com>
---
 drivers/mmc/host/Kconfig      |  8 ++++
 drivers/mmc/host/Makefile     |  1 +
 drivers/mmc/host/sdhci-npcm.c | 81 +++++++++++++++++++++++++++++++++++
 3 files changed, 90 insertions(+)
 create mode 100644 drivers/mmc/host/sdhci-npcm.c

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index ccc148cdb5ee..db66bb60ea40 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -704,6 +704,14 @@ config MMC_TMIO
 	  This provides support for the SD/MMC cell found in TC6393XB,
 	  T7L66XB and also HTC ASIC3
 
+config MMC_SDHCI_NPCM
+	tristate "Secure Digital Host Controller Interface support for NPCM"
+	depends on ARCH_NPCM
+	depends on MMC_SDHCI_PLTFM
+	help
+	  This provides support for the SD/eMMC controller found in
+	  NPCM BMC family SoCs.
+
 config MMC_SDHI
 	tristate "Renesas SDHI SD/SDIO controller support"
 	depends on SUPERH || ARCH_RENESAS || COMPILE_TEST
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 14004cc09aaa..d2341cfbd754 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -38,6 +38,7 @@ obj-$(CONFIG_MMC_SPI)		+= of_mmc_spi.o
 obj-$(CONFIG_MMC_S3C)   	+= s3cmci.o
 obj-$(CONFIG_MMC_SDRICOH_CS)	+= sdricoh_cs.o
 obj-$(CONFIG_MMC_TMIO)		+= tmio_mmc.o
+obj-$(CONFIG_MMC_SDHCI_NPCM)	+= sdhci-npcm.o
 obj-$(CONFIG_MMC_TMIO_CORE)	+= tmio_mmc_core.o
 obj-$(CONFIG_MMC_SDHI)		+= renesas_sdhi_core.o
 obj-$(CONFIG_MMC_SDHI_SYS_DMAC)		+= renesas_sdhi_sys_dmac.o
diff --git a/drivers/mmc/host/sdhci-npcm.c b/drivers/mmc/host/sdhci-npcm.c
new file mode 100644
index 000000000000..298c5f3e7c2b
--- /dev/null
+++ b/drivers/mmc/host/sdhci-npcm.c
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * NPCM SDHC MMC host controller driver.
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>
+#include <linux/module.h>
+#include <linux/of.h>
+
+#include "sdhci-pltfm.h"
+
+static const struct sdhci_pltfm_data npcm_sdhci_pdata = {
+	.quirks  = SDHCI_QUIRK_DELAY_AFTER_POWER,
+	.quirks2 = SDHCI_QUIRK2_STOP_WITH_TC |
+		   SDHCI_QUIRK2_NO_1_8_V,
+};
+
+static int npcm_sdhci_probe(struct platform_device *pdev)
+{
+	struct sdhci_pltfm_host *pltfm_host;
+	struct sdhci_host *host;
+	u32 caps;
+	int ret;
+
+	host = sdhci_pltfm_init(pdev, &npcm_sdhci_pdata, 0);
+	if (IS_ERR(host))
+		return PTR_ERR(host);
+
+	pltfm_host = sdhci_priv(host);
+	pltfm_host->clk = devm_clk_get(&pdev->dev, NULL);
+
+	if (!IS_ERR(pltfm_host->clk))
+		clk_prepare_enable(pltfm_host->clk);
+
+	caps = sdhci_readl(host, SDHCI_CAPABILITIES);
+	if (caps & SDHCI_CAN_DO_8BIT)
+		host->mmc->caps |= MMC_CAP_8_BIT_DATA;
+
+	ret = mmc_of_parse(host->mmc);
+	if (ret)
+		goto err_sdhci_add;
+
+	ret = sdhci_add_host(host);
+	if (ret)
+		goto err_sdhci_add;
+
+	return 0;
+
+err_sdhci_add:
+	clk_disable_unprepare(pltfm_host->clk);
+	sdhci_pltfm_free(pdev);
+	return ret;
+}
+
+static const struct of_device_id npcm_sdhci_of_match[] = {
+	{ .compatible = "nuvoton,npcm750-sdhci" },
+	{ .compatible = "nuvoton,npcm845-sdhci" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, npcm_sdhci_of_match);
+
+static struct platform_driver npcm_sdhci_driver = {
+	.driver = {
+		.name	= "npcm-sdhci",
+		.of_match_table = npcm_sdhci_of_match,
+		.pm	= &sdhci_pltfm_pmops,
+	},
+	.probe		= npcm_sdhci_probe,
+	.remove		= sdhci_pltfm_unregister,
+};
+
+module_platform_driver(npcm_sdhci_driver);
+
+MODULE_DESCRIPTION("NPCM Secure Digital Host Controller Interface driver");
+MODULE_AUTHOR("Tomer Maimon <tomer.maimon at nuvoton.com>");
+MODULE_LICENSE("GPL v2");
-- 
2.33.0