Merge tag 'mmc-v6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc

Pull MMC updates from Ulf Hansson:
 "MMC core:
   - Add documentation for the mmc-test driver
   - Register the eMMC RPMB partition with the RPMB subsystem
   - Some various cleanups

  MMC host:
   - dw_mmc-rockchip: Add support for the RK3576 variant
   - renesas_sdhi: Add support for the RZ/V2H(P) variant
   - sdhci_am654: Add a retry mechanism for tuning
   - sdhci-atmel: Convert DT bindings to json schema
   - sdhci-of-dwcmshc:
       - Add eMMC HW reset support for BlueField-3 SoC
       - Add support for the RK3576 variant
       - Add support for the Sophgo SG2042 variant
   - sdhci-of-ma35d1: Add new driver for the Nuvoton MA35D1 SDHCI

  Misc/Tee:
   - Add Replay Protected Memory Block (RPMB) subsystem
   - Let optee probe RPMB device using RPMB subsystem"

* tag 'mmc-v6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc: (41 commits)
  mmc: core: Use dev_err_probe for deferred regulators
  optee: Fix a NULL vs IS_ERR() check
  mmc: sdhci_am654: Add prints to tuning algorithm
  mmc: sdhci_am654: Add retry tuning
  dt-bindings: mmc: Add support for rk3576 eMMC
  Documentation: mmc: Add mmc-test doc
  rpmb: fix error path in rpmb_dev_register()
  optee: add RPMB dependency
  mmc: block: add RPMB dependency
  mmc: core Convert UNSTUFF_BITS macro to inline function
  dt-bindings: mmc: sdhci-atmel: Convert to json schema
  mmc: core: Convert simple_stroul to kstroul
  mmc: core: Calculate size from pointer
  mmc: cqhci: Make use of cqhci_halted() routine
  mmc: core: Replace the argument of mmc_sd_switch() with defines
  mmc: dw_mmc-rockchip: Add support for rk3576 SoCs
  mmc: dw_mmc-rockchip: Add internal phase support
  dt-bindings: mmc: Add support for rk3576 dw-mshc
  mmc: sdhci-of-dwcmshc: Add hw_reset() support for BlueField-3 SoC
  mmc: core: remove left-over data structure declarations
  ...

3 files changed, 242 insertions, 0 deletions

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 41c54051347a..3fe7e2a9bd29 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -104,6 +104,16 @@ config PHANTOM
 	  If you choose to build module, its name will be phantom. If unsure,
 	  say N here.
 
+config RPMB
+	tristate "RPMB partition interface"
+	depends on MMC
+	help
+	  Unified RPMB unit interface for RPMB capable devices such as eMMC and
+	  UFS. Provides interface for in-kernel security controllers to access
+	  RPMB unit.
+
+	  If unsure, select N.
+
 config TIFM_CORE
 	tristate "TI Flash Media interface support"
 	depends on PCI
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index c2f990862d2b..a9f94525e181 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_LKDTM)		+= lkdtm/
 obj-$(CONFIG_TIFM_CORE)       	+= tifm_core.o
 obj-$(CONFIG_TIFM_7XX1)       	+= tifm_7xx1.o
 obj-$(CONFIG_PHANTOM)		+= phantom.o
+obj-$(CONFIG_RPMB)		+= rpmb-core.o
 obj-$(CONFIG_QCOM_COINCELL)	+= qcom-coincell.o
 obj-$(CONFIG_QCOM_FASTRPC)	+= fastrpc.o
 obj-$(CONFIG_SENSORS_BH1770)	+= bh1770glc.o
diff --git a/drivers/misc/rpmb-core.c b/drivers/misc/rpmb-core.c
new file mode 100644
index 000000000000..bc68cde1a8bf
--- /dev/null
+++ b/drivers/misc/rpmb-core.c
@@ -0,0 +1,231 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright(c) 2015 - 2019 Intel Corporation. All rights reserved.
+ * Copyright(c) 2021 - 2024 Linaro Ltd.
+ */
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/rpmb.h>
+#include <linux/slab.h>
+
+static DEFINE_IDA(rpmb_ida);
+static DEFINE_MUTEX(rpmb_mutex);
+
+/**
+ * rpmb_dev_get() - increase rpmb device ref counter
+ * @rdev: rpmb device
+ */
+struct rpmb_dev *rpmb_dev_get(struct rpmb_dev *rdev)
+{
+	if (rdev)
+		get_device(&rdev->dev);
+	return rdev;
+}
+EXPORT_SYMBOL_GPL(rpmb_dev_get);
+
+/**
+ * rpmb_dev_put() - decrease rpmb device ref counter
+ * @rdev: rpmb device
+ */
+void rpmb_dev_put(struct rpmb_dev *rdev)
+{
+	if (rdev)
+		put_device(&rdev->dev);
+}
+EXPORT_SYMBOL_GPL(rpmb_dev_put);
+
+/**
+ * rpmb_route_frames() - route rpmb frames to rpmb device
+ * @rdev:	rpmb device
+ * @req:	rpmb request frames
+ * @req_len:	length of rpmb request frames in bytes
+ * @rsp:	rpmb response frames
+ * @rsp_len:	length of rpmb response frames in bytes
+ *
+ * Returns: < 0 on failure
+ */
+int rpmb_route_frames(struct rpmb_dev *rdev, u8 *req,
+		      unsigned int req_len, u8 *rsp, unsigned int rsp_len)
+{
+	if (!req || !req_len || !rsp || !rsp_len)
+		return -EINVAL;
+
+	return rdev->descr.route_frames(rdev->dev.parent, req, req_len,
+					rsp, rsp_len);
+}
+EXPORT_SYMBOL_GPL(rpmb_route_frames);
+
+static void rpmb_dev_release(struct device *dev)
+{
+	struct rpmb_dev *rdev = to_rpmb_dev(dev);
+
+	mutex_lock(&rpmb_mutex);
+	ida_simple_remove(&rpmb_ida, rdev->id);
+	mutex_unlock(&rpmb_mutex);
+	kfree(rdev->descr.dev_id);
+	kfree(rdev);
+}
+
+static struct class rpmb_class = {
+	.name = "rpmb",
+	.dev_release = rpmb_dev_release,
+};
+
+/**
+ * rpmb_dev_find_device() - return first matching rpmb device
+ * @start: rpmb device to begin with
+ * @data: data for the match function
+ * @match: the matching function
+ *
+ * Iterate over registered RPMB devices, and call @match() for each passing
+ * it the RPMB device and @data.
+ *
+ * The return value of @match() is checked for each call. If it returns
+ * anything other 0, break and return the found RPMB device.
+ *
+ * It's the callers responsibility to call rpmb_dev_put() on the returned
+ * device, when it's done with it.
+ *
+ * Returns: a matching rpmb device or NULL on failure
+ */
+struct rpmb_dev *rpmb_dev_find_device(const void *data,
+				      const struct rpmb_dev *start,
+				      int (*match)(struct device *dev,
+						   const void *data))
+{
+	struct device *dev;
+	const struct device *start_dev = NULL;
+
+	if (start)
+		start_dev = &start->dev;
+	dev = class_find_device(&rpmb_class, start_dev, data, match);
+
+	return dev ? to_rpmb_dev(dev) : NULL;
+}
+EXPORT_SYMBOL_GPL(rpmb_dev_find_device);
+
+int rpmb_interface_register(struct class_interface *intf)
+{
+	intf->class = &rpmb_class;
+
+	return class_interface_register(intf);
+}
+EXPORT_SYMBOL_GPL(rpmb_interface_register);
+
+void rpmb_interface_unregister(struct class_interface *intf)
+{
+	class_interface_unregister(intf);
+}
+EXPORT_SYMBOL_GPL(rpmb_interface_unregister);
+
+/**
+ * rpmb_dev_unregister() - unregister RPMB partition from the RPMB subsystem
+ * @rdev: the rpmb device to unregister
+ *
+ * This function should be called from the release function of the
+ * underlying device used when the RPMB device was registered.
+ *
+ * Returns: < 0 on failure
+ */
+int rpmb_dev_unregister(struct rpmb_dev *rdev)
+{
+	if (!rdev)
+		return -EINVAL;
+
+	device_del(&rdev->dev);
+
+	rpmb_dev_put(rdev);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rpmb_dev_unregister);
+
+/**
+ * rpmb_dev_register - register RPMB partition with the RPMB subsystem
+ * @dev: storage device of the rpmb device
+ * @descr: RPMB device description
+ *
+ * While registering the RPMB partition extract needed device information
+ * while needed resources are available.
+ *
+ * Returns: a pointer to a 'struct rpmb_dev' or an ERR_PTR on failure
+ */
+struct rpmb_dev *rpmb_dev_register(struct device *dev,
+				   struct rpmb_descr *descr)
+{
+	struct rpmb_dev *rdev;
+	int ret;
+
+	if (!dev || !descr || !descr->route_frames || !descr->dev_id ||
+	    !descr->dev_id_len)
+		return ERR_PTR(-EINVAL);
+
+	rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
+	if (!rdev)
+		return ERR_PTR(-ENOMEM);
+	rdev->descr = *descr;
+	rdev->descr.dev_id = kmemdup(descr->dev_id, descr->dev_id_len,
+				     GFP_KERNEL);
+	if (!rdev->descr.dev_id) {
+		ret = -ENOMEM;
+		goto err_free_rdev;
+	}
+
+	mutex_lock(&rpmb_mutex);
+	ret = ida_simple_get(&rpmb_ida, 0, 0, GFP_KERNEL);
+	mutex_unlock(&rpmb_mutex);
+	if (ret < 0)
+		goto err_free_dev_id;
+	rdev->id = ret;
+
+	dev_set_name(&rdev->dev, "rpmb%d", rdev->id);
+	rdev->dev.class = &rpmb_class;
+	rdev->dev.parent = dev;
+
+	ret = device_register(&rdev->dev);
+	if (ret) {
+		put_device(&rdev->dev);
+		return ERR_PTR(ret);
+	}
+
+	dev_dbg(&rdev->dev, "registered device\n");
+
+	return rdev;
+
+err_free_dev_id:
+	kfree(rdev->descr.dev_id);
+err_free_rdev:
+	kfree(rdev);
+	return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(rpmb_dev_register);
+
+static int __init rpmb_init(void)
+{
+	int ret;
+
+	ret = class_register(&rpmb_class);
+	if (ret) {
+		pr_err("couldn't create class\n");
+		return ret;
+	}
+	ida_init(&rpmb_ida);
+	return 0;
+}
+
+static void __exit rpmb_exit(void)
+{
+	ida_destroy(&rpmb_ida);
+	class_unregister(&rpmb_class);
+}
+
+subsys_initcall(rpmb_init);
+module_exit(rpmb_exit);
+
+MODULE_AUTHOR("Jens Wiklander <jens.wiklander@linaro.org>");
+MODULE_DESCRIPTION("RPMB class");
+MODULE_LICENSE("GPL");