1 files changed, 268 insertions, 0 deletions
diff --git a/drivers/bus/fsl-mc/mc-io.c b/drivers/bus/fsl-mc/mc-io.c
new file mode 100644
index 0000000000000..7226cfc49b6fd
--- /dev/null
+++ b/drivers/bus/fsl-mc/mc-io.c
@@ -0,0 +1,268 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
+/*
+ * Copyright 2013-2016 Freescale Semiconductor Inc.
+ *
+ */
+
+#include <linux/io.h>
+#include <linux/fsl/mc.h>
+
+#include "fsl-mc-private.h"
+
+static int fsl_mc_io_set_dpmcp(struct fsl_mc_io *mc_io,
+			       struct fsl_mc_device *dpmcp_dev)
+{
+	int error;
+
+	if (mc_io->dpmcp_dev)
+		return -EINVAL;
+
+	if (dpmcp_dev->mc_io)
+		return -EINVAL;
+
+	error = dpmcp_open(mc_io,
+			   0,
+			   dpmcp_dev->obj_desc.id,
+			   &dpmcp_dev->mc_handle);
+	if (error < 0)
+		return error;
+
+	mc_io->dpmcp_dev = dpmcp_dev;
+	dpmcp_dev->mc_io = mc_io;
+	return 0;
+}
+
+static void fsl_mc_io_unset_dpmcp(struct fsl_mc_io *mc_io)
+{
+	int error;
+	struct fsl_mc_device *dpmcp_dev = mc_io->dpmcp_dev;
+
+	error = dpmcp_close(mc_io,
+			    0,
+			    dpmcp_dev->mc_handle);
+	if (error < 0) {
+		dev_err(&dpmcp_dev->dev, "dpmcp_close() failed: %d\n",
+			error);
+	}
+
+	mc_io->dpmcp_dev = NULL;
+	dpmcp_dev->mc_io = NULL;
+}
+
+/**
+ * Creates an MC I/O object
+ *
+ * @dev: device to be associated with the MC I/O object
+ * @mc_portal_phys_addr: physical address of the MC portal to use
+ * @mc_portal_size: size in bytes of the MC portal
+ * @dpmcp-dev: Pointer to the DPMCP object associated with this MC I/O
+ * object or NULL if none.
+ * @flags: flags for the new MC I/O object
+ * @new_mc_io: Area to return pointer to newly created MC I/O object
+ *
+ * Returns '0' on Success; Error code otherwise.
+ */
+int __must_check fsl_create_mc_io(struct device *dev,
+				  phys_addr_t mc_portal_phys_addr,
+				  u32 mc_portal_size,
+				  struct fsl_mc_device *dpmcp_dev,
+				  u32 flags, struct fsl_mc_io **new_mc_io)
+{
+	int error;
+	struct fsl_mc_io *mc_io;
+	void __iomem *mc_portal_virt_addr;
+	struct resource *res;
+
+	mc_io = devm_kzalloc(dev, sizeof(*mc_io), GFP_KERNEL);
+	if (!mc_io)
+		return -ENOMEM;
+
+	mc_io->dev = dev;
+	mc_io->flags = flags;
+	mc_io->portal_phys_addr = mc_portal_phys_addr;
+	mc_io->portal_size = mc_portal_size;
+	if (flags & FSL_MC_IO_ATOMIC_CONTEXT_PORTAL)
+		spin_lock_init(&mc_io->spinlock);
+	else
+		mutex_init(&mc_io->mutex);
+
+	res = devm_request_mem_region(dev,
+				      mc_portal_phys_addr,
+				      mc_portal_size,
+				      "mc_portal");
+	if (!res) {
+		dev_err(dev,
+			"devm_request_mem_region failed for MC portal %pa\n",
+			&mc_portal_phys_addr);
+		return -EBUSY;
+	}
+
+	mc_portal_virt_addr = devm_ioremap_nocache(dev,
+						   mc_portal_phys_addr,
+						   mc_portal_size);
+	if (!mc_portal_virt_addr) {
+		dev_err(dev,
+			"devm_ioremap_nocache failed for MC portal %pa\n",
+			&mc_portal_phys_addr);
+		return -ENXIO;
+	}
+
+	mc_io->portal_virt_addr = mc_portal_virt_addr;
+	if (dpmcp_dev) {
+		error = fsl_mc_io_set_dpmcp(mc_io, dpmcp_dev);
+		if (error < 0)
+			goto error_destroy_mc_io;
+	}
+
+	*new_mc_io = mc_io;
+	return 0;
+
+error_destroy_mc_io:
+	fsl_destroy_mc_io(mc_io);
+	return error;
+}
+
+/**
+ * Destroys an MC I/O object
+ *
+ * @mc_io: MC I/O object to destroy
+ */
+void fsl_destroy_mc_io(struct fsl_mc_io *mc_io)
+{
+	struct fsl_mc_device *dpmcp_dev = mc_io->dpmcp_dev;
+
+	if (dpmcp_dev)
+		fsl_mc_io_unset_dpmcp(mc_io);
+
+	devm_iounmap(mc_io->dev, mc_io->portal_virt_addr);
+	devm_release_mem_region(mc_io->dev,
+				mc_io->portal_phys_addr,
+				mc_io->portal_size);
+
+	mc_io->portal_virt_addr = NULL;
+	devm_kfree(mc_io->dev, mc_io);
+}
+
+/**
+ * fsl_mc_portal_allocate - Allocates an MC portal
+ *
+ * @mc_dev: MC device for which the MC portal is to be allocated
+ * @mc_io_flags: Flags for the fsl_mc_io object that wraps the allocated
+ * MC portal.
+ * @new_mc_io: Pointer to area where the pointer to the fsl_mc_io object
+ * that wraps the allocated MC portal is to be returned
+ *
+ * This function allocates an MC portal from the device's parent DPRC,
+ * from the corresponding MC bus' pool of MC portals and wraps
+ * it in a new fsl_mc_io object. If 'mc_dev' is a DPRC itself, the
+ * portal is allocated from its own MC bus.
+ */
+int __must_check fsl_mc_portal_allocate(struct fsl_mc_device *mc_dev,
+					u16 mc_io_flags,
+					struct fsl_mc_io **new_mc_io)
+{
+	struct fsl_mc_device *mc_bus_dev;
+	struct fsl_mc_bus *mc_bus;
+	phys_addr_t mc_portal_phys_addr;
+	size_t mc_portal_size;
+	struct fsl_mc_device *dpmcp_dev;
+	int error = -EINVAL;
+	struct fsl_mc_resource *resource = NULL;
+	struct fsl_mc_io *mc_io = NULL;
+
+	if (mc_dev->flags & FSL_MC_IS_DPRC) {
+		mc_bus_dev = mc_dev;
+	} else {
+		if (!dev_is_fsl_mc(mc_dev->dev.parent))
+			return error;
+
+		mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent);
+	}
+
+	mc_bus = to_fsl_mc_bus(mc_bus_dev);
+	*new_mc_io = NULL;
+	error = fsl_mc_resource_allocate(mc_bus, FSL_MC_POOL_DPMCP, &resource);
+	if (error < 0)
+		return error;
+
+	error = -EINVAL;
+	dpmcp_dev = resource->data;
+
+	if (dpmcp_dev->obj_desc.ver_major < DPMCP_MIN_VER_MAJOR ||
+	    (dpmcp_dev->obj_desc.ver_major == DPMCP_MIN_VER_MAJOR &&
+	     dpmcp_dev->obj_desc.ver_minor < DPMCP_MIN_VER_MINOR)) {
+		dev_err(&dpmcp_dev->dev,
+			"ERROR: Version %d.%d of DPMCP not supported.\n",
+			dpmcp_dev->obj_desc.ver_major,
+			dpmcp_dev->obj_desc.ver_minor);
+		error = -ENOTSUPP;
+		goto error_cleanup_resource;
+	}
+
+	mc_portal_phys_addr = dpmcp_dev->regions[0].start;
+	mc_portal_size = resource_size(dpmcp_dev->regions);
+
+	error = fsl_create_mc_io(&mc_bus_dev->dev,
+				 mc_portal_phys_addr,
+				 mc_portal_size, dpmcp_dev,
+				 mc_io_flags, &mc_io);
+	if (error < 0)
+		goto error_cleanup_resource;
+
+	*new_mc_io = mc_io;
+	return 0;
+
+error_cleanup_resource:
+	fsl_mc_resource_free(resource);
+	return error;
+}
+EXPORT_SYMBOL_GPL(fsl_mc_portal_allocate);
+
+/**
+ * fsl_mc_portal_free - Returns an MC portal to the pool of free MC portals
+ * of a given MC bus
+ *
+ * @mc_io: Pointer to the fsl_mc_io object that wraps the MC portal to free
+ */
+void fsl_mc_portal_free(struct fsl_mc_io *mc_io)
+{
+	struct fsl_mc_device *dpmcp_dev;
+	struct fsl_mc_resource *resource;
+
+	/*
+	 * Every mc_io obtained by calling fsl_mc_portal_allocate() is supposed
+	 * to have a DPMCP object associated with.
+	 */
+	dpmcp_dev = mc_io->dpmcp_dev;
+
+	resource = dpmcp_dev->resource;
+	if (!resource || resource->type != FSL_MC_POOL_DPMCP)
+		return;
+
+	if (resource->data != dpmcp_dev)
+		return;
+
+	fsl_destroy_mc_io(mc_io);
+	fsl_mc_resource_free(resource);
+}
+EXPORT_SYMBOL_GPL(fsl_mc_portal_free);
+
+/**
+ * fsl_mc_portal_reset - Resets the dpmcp object for a given fsl_mc_io object
+ *
+ * @mc_io: Pointer to the fsl_mc_io object that wraps the MC portal to free
+ */
+int fsl_mc_portal_reset(struct fsl_mc_io *mc_io)
+{
+	int error;
+	struct fsl_mc_device *dpmcp_dev = mc_io->dpmcp_dev;
+
+	error = dpmcp_reset(mc_io, 0, dpmcp_dev->mc_handle);
+	if (error < 0) {
+		dev_err(&dpmcp_dev->dev, "dpmcp_reset() failed: %d\n", error);
+		return error;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(fsl_mc_portal_reset);