meta-ox64-bsp/recipes-kernel/linux/linux-yocto/0012-WIP-sdhci-add-BFLB-sdhci-driver.patch

From 14d10e1f6fd28f9c760c46b5fd1becd2f2b20f9a Mon Sep 17 00:00:00 2001
From: Allen Martin <armartin@gmail.com>
Date: Wed, 11 Jan 2023 18:16:51 -0800
Subject: [PATCH 12/15] WIP: sdhci: add BFLB sdhci driver

---
 .../boot/dts/bouffalolab/bl808-sipeed-m1s.dts |   4 +
 arch/riscv/boot/dts/bouffalolab/bl808.dtsi    |  11 ++
 drivers/mmc/host/Kconfig                      |  14 +++
 drivers/mmc/host/Makefile                     |   1 +
 drivers/mmc/host/sdhci-bflb.c                 | 117 ++++++++++++++++++
 5 files changed, 147 insertions(+)
 create mode 100644 drivers/mmc/host/sdhci-bflb.c

diff --git a/arch/riscv/boot/dts/bouffalolab/bl808-sipeed-m1s.dts b/arch/riscv/boot/dts/bouffalolab/bl808-sipeed-m1s.dts
index 70259bad7dfd..effaeda67c3f 100644
--- a/arch/riscv/boot/dts/bouffalolab/bl808-sipeed-m1s.dts
+++ b/arch/riscv/boot/dts/bouffalolab/bl808-sipeed-m1s.dts
@@ -46,6 +46,10 @@ &uart0 {
 	status = "okay";
 };
 
+&sdhci0 {
+	status = "okay";
+};
+
 &ipclic {
 	status = "okay";
 };
diff --git a/arch/riscv/boot/dts/bouffalolab/bl808.dtsi b/arch/riscv/boot/dts/bouffalolab/bl808.dtsi
index c5cda8d74ccd..6f859194f82c 100644
--- a/arch/riscv/boot/dts/bouffalolab/bl808.dtsi
+++ b/arch/riscv/boot/dts/bouffalolab/bl808.dtsi
@@ -61,6 +61,17 @@ uart0: serial@30002000 {
 			status = "disabled";
 		};
 
+		sdhci0: sdhci@20060000 {
+			compatible = "bouffalolab,bflb-sdhci";
+			reg = <0x20060000 0x100>;
+			interrupts-extended = <&ipclic BFLB_IPC_SOURCE_M0
+						       BFLB_IPC_DEVICE_SDHCI
+						       IRQ_TYPE_EDGE_RISING>;
+			mboxes = <&ipclic BFLB_IPC_SOURCE_M0 BFLB_IPC_DEVICE_SDHCI>;
+			clocks = <&xtal>;
+			status = "disabled";
+		};
+
 		ipclic: mailbox@30005000 {
 			compatible = "bouffalolab,bflb-ipc";
 			reg = <0x30005000 0x20>,
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 5e19a961c34d..f3c4654bb376 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -413,6 +413,20 @@ config MMC_SDHCI_F_SDH30
 
 	  If unsure, say N.
 
+config MMC_SDHCI_BFLB
+	tristate "SDHCI support on Bouffalo Lab BL808 SoC"
+	depends on MMC_SDHCI_PLTFM
+	depends on OF
+	depends on COMMON_CLK
+	select MMC_SDHCI_IO_ACCESSORS
+	help
+	  This selects the Secure Digital Host Controller Interface in
+	  Bouffalo Lab BL808 SoC.
+
+	  If you have a controller with this interface, say Y or M here.
+
+	  If unsure, say N.
+
 config MMC_SDHCI_MILBEAUT
 	tristate "SDHCI support for Socionext Milbeaut Serieas using F_SDH30"
 	depends on MMC_SDHCI_PLTFM
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index ba0c6d0cd85d..626875dfb629 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -103,6 +103,7 @@ cqhci-y					+= cqhci-core.o
 cqhci-$(CONFIG_MMC_CRYPTO)		+= cqhci-crypto.o
 obj-$(CONFIG_MMC_HSQ)			+= mmc_hsq.o
 obj-$(CONFIG_MMC_LITEX)			+= litex_mmc.o
+obj-$(CONFIG_MMC_SDHCI_BFLB)		+= sdhci-bflb.o
 
 ifeq ($(CONFIG_CB710_DEBUG),y)
 	CFLAGS-cb710-mmc	+= -DDEBUG
diff --git a/drivers/mmc/host/sdhci-bflb.c b/drivers/mmc/host/sdhci-bflb.c
new file mode 100644
index 000000000000..a67ecb2a380d
--- /dev/null
+++ b/drivers/mmc/host/sdhci-bflb.c
@@ -0,0 +1,117 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/mmc/host.h>
+#include <linux/module.h>
+#include <linux/of.h>
+
+#include "sdhci-pltfm.h"
+
+static u16 sdhci_bflb_readw(struct sdhci_host *host, int reg)
+{
+	u16 ret;
+
+	switch (reg) {
+	case SDHCI_HOST_VERSION:
+	case SDHCI_SLOT_INT_STATUS:
+		/* those registers don't exist */
+		return 0;
+	default:
+		ret = readw(host->ioaddr + reg);
+	}
+	return ret;
+}
+
+static u32 sdhci_bflb_readl(struct sdhci_host *host, int reg)
+{
+	u32 ret;
+
+	ret = readl(host->ioaddr + reg);
+
+	switch (reg) {
+	case SDHCI_CAPABILITIES:
+		/* Mask the support for 3.0V */
+		ret &= ~SDHCI_CAN_VDD_300;
+		break;
+	}
+	return ret;
+}
+
+static const struct sdhci_ops sdhci_bflb_ops = {
+	.read_w	= sdhci_bflb_readw,
+	.read_l	= sdhci_bflb_readl,
+	.set_clock = sdhci_set_clock,
+	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
+	.get_timeout_clock = sdhci_pltfm_clk_get_max_clock,
+	.set_bus_width = sdhci_set_bus_width,
+	.reset = sdhci_reset,
+	.set_uhs_signaling = sdhci_set_uhs_signaling,
+};
+
+static const struct sdhci_pltfm_data sdhci_bflb_pdata = {
+	.ops	= &sdhci_bflb_ops,
+	.quirks	= SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER |
+		  SDHCI_QUIRK_NO_BUSY_IRQ |
+		  SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
+		  SDHCI_QUIRK_NO_HISPD_BIT |
+		  SDHCI_QUIRK_BROKEN_CARD_DETECTION |
+		  SDHCI_QUIRK_BROKEN_DMA |
+		  SDHCI_QUIRK_BROKEN_ADMA |
+		  SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
+};
+
+static int sdhci_bflb_probe(struct platform_device *pdev)
+{
+	struct sdhci_host *host;
+	struct sdhci_pltfm_host *pltfm_host;
+	int ret;
+
+	host = sdhci_pltfm_init(pdev, &sdhci_bflb_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);
+
+	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 sdhci_bflb_of_match_table[] = {
+	{ .compatible = "bouffalolab,bflb-sdhci", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, sdhci_bflb_of_match_table);
+
+static struct platform_driver sdhci_bflb_driver = {
+	.driver		= {
+		.name	= "sdhci-bflb",
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+		.pm	= &sdhci_pltfm_pmops,
+		.of_match_table = sdhci_bflb_of_match_table,
+	},
+	.probe		= sdhci_bflb_probe,
+//	.remove		= sdhci_pltfm_unregister,
+};
+
+module_platform_driver(sdhci_bflb_driver);
+
+MODULE_DESCRIPTION("SDHCI driver for Bflb");
+MODULE_LICENSE("GPL v2");
-- 
2.39.0