[PATCH v2 7/9] ufs: Add a PCI based UFS controller driver

[Bin Meng]

This adds a simple PCI based UFS controller driver with a QEMU
emulated UFS controller on the PCI bus.

Requiring QEMU v8.2+.

Signed-off-by: Bin Meng <bmeng at tinylab.org>

---

Changes in v2:
- fix a build warning

 drivers/ufs/Kconfig   | 11 +++++++++++
 drivers/ufs/Makefile  |  1 +
 drivers/ufs/ufs-pci.c | 45 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 57 insertions(+)
 create mode 100644 drivers/ufs/ufs-pci.c

diff --git a/drivers/ufs/Kconfig b/drivers/ufs/Kconfig
index 0e0cc58e3d..42797ce052 100644
--- a/drivers/ufs/Kconfig
+++ b/drivers/ufs/Kconfig
@@ -15,6 +15,17 @@ config CADENCE_UFS
 	  This selects the platform driver for the Cadence UFS host
 	  controller present on present TI's J721e devices.
 
+config UFS_PCI
+	bool "PCI bus based UFS Controller support"
+	depends on PCI && UFS
+	help
+	  This selects the PCI UFS Host Controller Interface. Select this if
+	  you have UFS Host Controller with PCI Interface.
+
+	  If you have a controller with this interface, say Y here.
+
+	  If unsure, say N.
+
 config TI_J721E_UFS
 	bool "Glue Layer driver for UFS on TI J721E devices"
 	help
diff --git a/drivers/ufs/Makefile b/drivers/ufs/Makefile
index 4f3344fd4e..13f1e689ef 100644
--- a/drivers/ufs/Makefile
+++ b/drivers/ufs/Makefile
@@ -6,4 +6,5 @@
 obj-$(CONFIG_UFS) += ufs.o ufs-uclass.o
 obj-$(CONFIG_CADENCE_UFS) += cdns-platform.o
 obj-$(CONFIG_TI_J721E_UFS) += ti-j721e-ufs.o
+obj-$(CONFIG_UFS_PCI) += ufs-pci.o
 obj-$(CONFIG_UFS_RENESAS) += ufs-renesas.o
diff --git a/drivers/ufs/ufs-pci.c b/drivers/ufs/ufs-pci.c
new file mode 100644
index 0000000000..ad41358727
--- /dev/null
+++ b/drivers/ufs/ufs-pci.c
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2023 tinylab.org
+ * Author: Bin Meng <bmeng at tinylab.org>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <pci.h>
+#include <ufs.h>
+#include <dm/device_compat.h>
+#include "ufs.h"
+
+static int ufs_pci_bind(struct udevice *dev)
+{
+	struct udevice *scsi_dev;
+
+	return ufs_scsi_bind(dev, &scsi_dev);
+}
+
+static int ufs_pci_probe(struct udevice *dev)
+{
+	int err;
+
+	err = ufshcd_probe(dev, NULL);
+	if (err)
+		dev_err(dev, "%s failed (ret=%d)\n", __func__, err);
+
+	return err;
+}
+
+U_BOOT_DRIVER(ufs_pci) = {
+	.name	= "ufs_pci",
+	.id	= UCLASS_UFS,
+	.bind	= ufs_pci_bind,
+	.probe	= ufs_pci_probe,
+};
+
+static struct pci_device_id ufs_supported[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_REDHAT, PCI_DEVICE_ID_REDHAT_UFS) },
+	{},
+};
+
+U_BOOT_PCI_DEVICE(ufs_pci, ufs_supported);
-- 
2.34.1