staging: fsl-mc: Freescale Management Complex (fsl-mc) bus driver
Platform device driver that sets up the basic bus infrastructure
for the fsl-mc bus type, including support for adding/removing
fsl-mc devices, register/unregister of fsl-mc drivers, and bus
match support to bind devices to drivers.
Signed-off-by: J. German Rivera <German.Rivera@freescale.com>
Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
Acked-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/fsl-mc/bus/mc-bus.c b/drivers/staging/fsl-mc/bus/mc-bus.c
new file mode 100644
index 0000000..ce1de52
--- /dev/null
+++ b/drivers/staging/fsl-mc/bus/mc-bus.c
@@ -0,0 +1,755 @@
+/*
+ * Freescale Management Complex (MC) bus driver
+ *
+ * Copyright (C) 2014 Freescale Semiconductor, Inc.
+ * Author: German Rivera <German.Rivera@freescale.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include "../include/mc-private.h"
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/limits.h>
+#include "../include/dpmng.h"
+#include "../include/mc-sys.h"
+#include "dprc-cmd.h"
+
+static struct kmem_cache *mc_dev_cache;
+
+/**
+ * fsl_mc_bus_match - device to driver matching callback
+ * @dev: the MC object device structure to match against
+ * @drv: the device driver to search for matching MC object device id
+ * structures
+ *
+ * Returns 1 on success, 0 otherwise.
+ */
+static int fsl_mc_bus_match(struct device *dev, struct device_driver *drv)
+{
+ const struct fsl_mc_device_match_id *id;
+ struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
+ struct fsl_mc_driver *mc_drv = to_fsl_mc_driver(drv);
+ bool found = false;
+
+ if (WARN_ON(!fsl_mc_bus_type.dev_root))
+ goto out;
+
+ if (!mc_drv->match_id_table)
+ goto out;
+
+ /*
+ * If the object is not 'plugged' don't match.
+ * Only exception is the root DPRC, which is a special case.
+ */
+ if ((mc_dev->obj_desc.state & DPRC_OBJ_STATE_PLUGGED) == 0 &&
+ &mc_dev->dev != fsl_mc_bus_type.dev_root)
+ goto out;
+
+ /*
+ * Traverse the match_id table of the given driver, trying to find
+ * a matching for the given MC object device.
+ */
+ for (id = mc_drv->match_id_table; id->vendor != 0x0; id++) {
+ if (id->vendor == mc_dev->obj_desc.vendor &&
+ strcmp(id->obj_type, mc_dev->obj_desc.type) == 0 &&
+ id->ver_major == mc_dev->obj_desc.ver_major &&
+ id->ver_minor == mc_dev->obj_desc.ver_minor) {
+ found = true;
+ break;
+ }
+ }
+
+out:
+ dev_dbg(dev, "%smatched\n", found ? "" : "not ");
+ return found;
+}
+
+/**
+ * fsl_mc_bus_uevent - callback invoked when a device is added
+ */
+static int fsl_mc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ pr_debug("%s invoked\n", __func__);
+ return 0;
+}
+
+struct bus_type fsl_mc_bus_type = {
+ .name = "fsl-mc",
+ .match = fsl_mc_bus_match,
+ .uevent = fsl_mc_bus_uevent,
+};
+EXPORT_SYMBOL_GPL(fsl_mc_bus_type);
+
+static int fsl_mc_driver_probe(struct device *dev)
+{
+ struct fsl_mc_driver *mc_drv;
+ struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
+ int error;
+
+ if (WARN_ON(!dev->driver))
+ return -EINVAL;
+
+ mc_drv = to_fsl_mc_driver(dev->driver);
+ if (WARN_ON(!mc_drv->probe))
+ return -EINVAL;
+
+ error = mc_drv->probe(mc_dev);
+ if (error < 0) {
+ dev_err(dev, "MC object device probe callback failed: %d\n",
+ error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int fsl_mc_driver_remove(struct device *dev)
+{
+ struct fsl_mc_driver *mc_drv = to_fsl_mc_driver(dev->driver);
+ struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
+ int error;
+
+ if (WARN_ON(!dev->driver))
+ return -EINVAL;
+
+ error = mc_drv->remove(mc_dev);
+ if (error < 0) {
+ dev_err(dev,
+ "MC object device remove callback failed: %d\n",
+ error);
+ return error;
+ }
+
+ return 0;
+}
+
+static void fsl_mc_driver_shutdown(struct device *dev)
+{
+ struct fsl_mc_driver *mc_drv = to_fsl_mc_driver(dev->driver);
+ struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
+
+ mc_drv->shutdown(mc_dev);
+}
+
+/**
+ * __fsl_mc_driver_register - registers a child device driver with the
+ * MC bus
+ *
+ * This function is implicitly invoked from the registration function of
+ * fsl_mc device drivers, which is generated by the
+ * module_fsl_mc_driver() macro.
+ */
+int __fsl_mc_driver_register(struct fsl_mc_driver *mc_driver,
+ struct module *owner)
+{
+ int error;
+
+ mc_driver->driver.owner = owner;
+ mc_driver->driver.bus = &fsl_mc_bus_type;
+
+ if (mc_driver->probe)
+ mc_driver->driver.probe = fsl_mc_driver_probe;
+
+ if (mc_driver->remove)
+ mc_driver->driver.remove = fsl_mc_driver_remove;
+
+ if (mc_driver->shutdown)
+ mc_driver->driver.shutdown = fsl_mc_driver_shutdown;
+
+ error = driver_register(&mc_driver->driver);
+ if (error < 0) {
+ pr_err("driver_register() failed for %s: %d\n",
+ mc_driver->driver.name, error);
+ return error;
+ }
+
+ pr_info("MC object device driver %s registered\n",
+ mc_driver->driver.name);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(__fsl_mc_driver_register);
+
+/**
+ * fsl_mc_driver_unregister - unregisters a device driver from the
+ * MC bus
+ */
+void fsl_mc_driver_unregister(struct fsl_mc_driver *mc_driver)
+{
+ driver_unregister(&mc_driver->driver);
+}
+EXPORT_SYMBOL_GPL(fsl_mc_driver_unregister);
+
+static int get_dprc_icid(struct fsl_mc_io *mc_io,
+ int container_id, uint16_t *icid)
+{
+ uint16_t dprc_handle;
+ struct dprc_attributes attr;
+ int error;
+
+ error = dprc_open(mc_io, container_id, &dprc_handle);
+ if (error < 0) {
+ pr_err("dprc_open() failed: %d\n", error);
+ return error;
+ }
+
+ memset(&attr, 0, sizeof(attr));
+ error = dprc_get_attributes(mc_io, dprc_handle, &attr);
+ if (error < 0) {
+ pr_err("dprc_get_attributes() failed: %d\n", error);
+ goto common_cleanup;
+ }
+
+ *icid = attr.icid;
+ error = 0;
+
+common_cleanup:
+ (void)dprc_close(mc_io, dprc_handle);
+ return error;
+}
+
+static int translate_mc_addr(uint64_t mc_addr, phys_addr_t *phys_addr)
+{
+ int i;
+ struct fsl_mc *mc = dev_get_drvdata(fsl_mc_bus_type.dev_root->parent);
+
+ if (mc->num_translation_ranges == 0) {
+ /*
+ * Do identity mapping:
+ */
+ *phys_addr = mc_addr;
+ return 0;
+ }
+
+ for (i = 0; i < mc->num_translation_ranges; i++) {
+ struct fsl_mc_addr_translation_range *range =
+ &mc->translation_ranges[i];
+
+ if (mc_addr >= range->start_mc_addr &&
+ mc_addr < range->end_mc_addr) {
+ *phys_addr = range->start_phys_addr +
+ (mc_addr - range->start_mc_addr);
+ return 0;
+ }
+ }
+
+ return -EFAULT;
+}
+
+static int fsl_mc_device_get_mmio_regions(struct fsl_mc_device *mc_dev,
+ struct fsl_mc_device *mc_bus_dev)
+{
+ int i;
+ int error;
+ struct resource *regions;
+ struct dprc_obj_desc *obj_desc = &mc_dev->obj_desc;
+ struct device *parent_dev = mc_dev->dev.parent;
+
+ regions = kmalloc_array(obj_desc->region_count,
+ sizeof(regions[0]), GFP_KERNEL);
+ if (!regions)
+ return -ENOMEM;
+
+ for (i = 0; i < obj_desc->region_count; i++) {
+ struct dprc_region_desc region_desc;
+
+ error = dprc_get_obj_region(mc_bus_dev->mc_io,
+ mc_bus_dev->mc_handle,
+ obj_desc->type,
+ obj_desc->id, i, ®ion_desc);
+ if (error < 0) {
+ dev_err(parent_dev,
+ "dprc_get_obj_region() failed: %d\n", error);
+ goto error_cleanup_regions;
+ }
+
+ WARN_ON(region_desc.base_paddr == 0x0);
+ WARN_ON(region_desc.size == 0);
+ error = translate_mc_addr(region_desc.base_paddr,
+ ®ions[i].start);
+ if (error < 0) {
+ dev_err(parent_dev,
+ "Invalid MC address: %#llx\n",
+ region_desc.base_paddr);
+ goto error_cleanup_regions;
+ }
+
+ regions[i].end = regions[i].start + region_desc.size - 1;
+ regions[i].name = "fsl-mc object MMIO region";
+ regions[i].flags = IORESOURCE_IO;
+ }
+
+ mc_dev->regions = regions;
+ return 0;
+
+error_cleanup_regions:
+ kfree(regions);
+ return error;
+}
+
+/**
+ * Add a newly discovered MC object device to be visible in Linux
+ */
+int fsl_mc_device_add(struct dprc_obj_desc *obj_desc,
+ struct fsl_mc_io *mc_io,
+ struct device *parent_dev,
+ struct fsl_mc_device **new_mc_dev)
+{
+ int error;
+ struct fsl_mc_device *mc_dev = NULL;
+ struct fsl_mc_bus *mc_bus = NULL;
+ struct fsl_mc_device *parent_mc_dev;
+
+ if (parent_dev->bus == &fsl_mc_bus_type)
+ parent_mc_dev = to_fsl_mc_device(parent_dev);
+ else
+ parent_mc_dev = NULL;
+
+ if (strcmp(obj_desc->type, "dprc") == 0) {
+ /*
+ * Allocate an MC bus device object:
+ */
+ mc_bus = devm_kzalloc(parent_dev, sizeof(*mc_bus), GFP_KERNEL);
+ if (!mc_bus)
+ return -ENOMEM;
+
+ mc_dev = &mc_bus->mc_dev;
+ } else {
+ /*
+ * Allocate a regular fsl_mc_device object:
+ */
+ mc_dev = kmem_cache_zalloc(mc_dev_cache, GFP_KERNEL);
+ if (!mc_dev)
+ return -ENOMEM;
+ }
+
+ mc_dev->obj_desc = *obj_desc;
+ mc_dev->mc_io = mc_io;
+ device_initialize(&mc_dev->dev);
+ mc_dev->dev.parent = parent_dev;
+ mc_dev->dev.bus = &fsl_mc_bus_type;
+ dev_set_name(&mc_dev->dev, "%s.%x", obj_desc->type, obj_desc->id);
+
+ if (strcmp(obj_desc->type, "dprc") == 0) {
+ struct fsl_mc_io *mc_io2;
+
+ mc_dev->flags |= FSL_MC_IS_DPRC;
+
+ /*
+ * To get the DPRC's ICID, we need to open the DPRC
+ * in get_dprc_icid(). For child DPRCs, we do so using the
+ * parent DPRC's MC portal instead of the child DPRC's MC
+ * portal, in case the child DPRC is already opened with
+ * its own portal (e.g., the DPRC used by AIOP).
+ *
+ * NOTE: There cannot be more than one active open for a
+ * given MC object, using the same MC portal.
+ */
+ if (parent_mc_dev) {
+ /*
+ * device being added is a child DPRC device
+ */
+ mc_io2 = parent_mc_dev->mc_io;
+ } else {
+ /*
+ * device being added is the root DPRC device
+ */
+ if (WARN_ON(!mc_io)) {
+ error = -EINVAL;
+ goto error_cleanup_dev;
+ }
+
+ mc_io2 = mc_io;
+
+ if (!fsl_mc_bus_type.dev_root)
+ fsl_mc_bus_type.dev_root = &mc_dev->dev;
+ }
+
+ error = get_dprc_icid(mc_io2, obj_desc->id, &mc_dev->icid);
+ if (error < 0)
+ goto error_cleanup_dev;
+ } else {
+ /*
+ * A non-DPRC MC object device has to be a child of another
+ * MC object (specifically a DPRC object)
+ */
+ mc_dev->icid = parent_mc_dev->icid;
+ mc_dev->dma_mask = FSL_MC_DEFAULT_DMA_MASK;
+ mc_dev->dev.dma_mask = &mc_dev->dma_mask;
+ }
+
+ /*
+ * Get MMIO regions for the device from the MC:
+ *
+ * NOTE: the root DPRC is a special case as its MMIO region is
+ * obtained from the device tree
+ */
+ if (parent_mc_dev && obj_desc->region_count != 0) {
+ error = fsl_mc_device_get_mmio_regions(mc_dev,
+ parent_mc_dev);
+ if (error < 0)
+ goto error_cleanup_dev;
+ }
+
+ /*
+ * The device-specific probe callback will get invoked by device_add()
+ */
+ error = device_add(&mc_dev->dev);
+ if (error < 0) {
+ dev_err(parent_dev,
+ "device_add() failed for device %s: %d\n",
+ dev_name(&mc_dev->dev), error);
+ goto error_cleanup_dev;
+ }
+
+ (void)get_device(&mc_dev->dev);
+ dev_dbg(parent_dev, "Added MC object device %s\n",
+ dev_name(&mc_dev->dev));
+
+ *new_mc_dev = mc_dev;
+ return 0;
+
+error_cleanup_dev:
+ kfree(mc_dev->regions);
+ if (mc_bus)
+ devm_kfree(parent_dev, mc_bus);
+ else
+ kmem_cache_free(mc_dev_cache, mc_dev);
+
+ return error;
+}
+EXPORT_SYMBOL_GPL(fsl_mc_device_add);
+
+/**
+ * fsl_mc_device_remove - Remove a MC object device from being visible to
+ * Linux
+ *
+ * @mc_dev: Pointer to a MC object device object
+ */
+void fsl_mc_device_remove(struct fsl_mc_device *mc_dev)
+{
+ struct fsl_mc_bus *mc_bus = NULL;
+
+ kfree(mc_dev->regions);
+
+ /*
+ * The device-specific remove callback will get invoked by device_del()
+ */
+ device_del(&mc_dev->dev);
+ put_device(&mc_dev->dev);
+
+ if (strcmp(mc_dev->obj_desc.type, "dprc") == 0) {
+ struct fsl_mc_io *mc_io = mc_dev->mc_io;
+
+ mc_bus = to_fsl_mc_bus(mc_dev);
+ fsl_destroy_mc_io(mc_io);
+ if (&mc_dev->dev == fsl_mc_bus_type.dev_root)
+ fsl_mc_bus_type.dev_root = NULL;
+ }
+
+ mc_dev->mc_io = NULL;
+ if (mc_bus)
+ devm_kfree(mc_dev->dev.parent, mc_bus);
+ else
+ kmem_cache_free(mc_dev_cache, mc_dev);
+}
+EXPORT_SYMBOL_GPL(fsl_mc_device_remove);
+
+static int parse_mc_ranges(struct device *dev,
+ int *paddr_cells,
+ int *mc_addr_cells,
+ int *mc_size_cells,
+ const __be32 **ranges_start,
+ uint8_t *num_ranges)
+{
+ const __be32 *prop;
+ int range_tuple_cell_count;
+ int ranges_len;
+ int tuple_len;
+ struct device_node *mc_node = dev->of_node;
+
+ *ranges_start = of_get_property(mc_node, "ranges", &ranges_len);
+ if (!(*ranges_start) || !ranges_len) {
+ dev_warn(dev,
+ "missing or empty ranges property for device tree node '%s'\n",
+ mc_node->name);
+
+ *num_ranges = 0;
+ return 0;
+ }
+
+ *paddr_cells = of_n_addr_cells(mc_node);
+
+ prop = of_get_property(mc_node, "#address-cells", NULL);
+ if (prop)
+ *mc_addr_cells = be32_to_cpup(prop);
+ else
+ *mc_addr_cells = *paddr_cells;
+
+ prop = of_get_property(mc_node, "#size-cells", NULL);
+ if (prop)
+ *mc_size_cells = be32_to_cpup(prop);
+ else
+ *mc_size_cells = of_n_size_cells(mc_node);
+
+ range_tuple_cell_count = *paddr_cells + *mc_addr_cells +
+ *mc_size_cells;
+
+ tuple_len = range_tuple_cell_count * sizeof(__be32);
+ if (ranges_len % tuple_len != 0) {
+ dev_err(dev, "malformed ranges property '%s'\n", mc_node->name);
+ return -EINVAL;
+ }
+
+ *num_ranges = ranges_len / tuple_len;
+ return 0;
+}
+
+static int get_mc_addr_translation_ranges(struct device *dev,
+ struct fsl_mc_addr_translation_range
+ **ranges,
+ uint8_t *num_ranges)
+{
+ int error;
+ int paddr_cells;
+ int mc_addr_cells;
+ int mc_size_cells;
+ int i;
+ const __be32 *ranges_start;
+ const __be32 *cell;
+
+ error = parse_mc_ranges(dev,
+ &paddr_cells,
+ &mc_addr_cells,
+ &mc_size_cells,
+ &ranges_start,
+ num_ranges);
+ if (error < 0)
+ return error;
+
+ if (!(*num_ranges)) {
+ /*
+ * Missing or empty ranges property ("ranges;") for the
+ * 'fsl,qoriq-mc' node. In this case, identity mapping
+ * will be used.
+ */
+ *ranges = NULL;
+ return 0;
+ }
+
+ *ranges = devm_kcalloc(dev, *num_ranges,
+ sizeof(struct fsl_mc_addr_translation_range),
+ GFP_KERNEL);
+ if (!(*ranges))
+ return -ENOMEM;
+
+ cell = ranges_start;
+ for (i = 0; i < *num_ranges; ++i) {
+ struct fsl_mc_addr_translation_range *range = &(*ranges)[i];
+
+ range->start_mc_addr = of_read_number(cell, mc_addr_cells);
+ cell += mc_addr_cells;
+ range->start_phys_addr = of_read_number(cell, paddr_cells);
+ cell += paddr_cells;
+ range->end_mc_addr = range->start_mc_addr +
+ of_read_number(cell, mc_size_cells);
+
+ cell += mc_size_cells;
+ }
+
+ return 0;
+}
+
+/**
+ * fsl_mc_bus_probe - callback invoked when the root MC bus is being
+ * added
+ */
+static int fsl_mc_bus_probe(struct platform_device *pdev)
+{
+ struct dprc_obj_desc obj_desc;
+ int error;
+ struct fsl_mc *mc;
+ struct fsl_mc_device *mc_bus_dev = NULL;
+ struct fsl_mc_io *mc_io = NULL;
+ int container_id;
+ phys_addr_t mc_portal_phys_addr;
+ uint32_t mc_portal_size;
+ struct mc_version mc_version;
+ struct resource res;
+
+ dev_info(&pdev->dev, "Root MC bus device probed");
+
+ mc = devm_kzalloc(&pdev->dev, sizeof(*mc), GFP_KERNEL);
+ if (!mc)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, mc);
+
+ /*
+ * Get physical address of MC portal for the root DPRC:
+ */
+ error = of_address_to_resource(pdev->dev.of_node, 0, &res);
+ if (error < 0) {
+ dev_err(&pdev->dev,
+ "of_address_to_resource() failed for %s\n",
+ pdev->dev.of_node->full_name);
+ return error;
+ }
+
+ mc_portal_phys_addr = res.start;
+ mc_portal_size = resource_size(&res);
+ error = fsl_create_mc_io(&pdev->dev, mc_portal_phys_addr,
+ mc_portal_size, 0, &mc_io);
+ if (error < 0)
+ return error;
+
+ error = mc_get_version(mc_io, &mc_version);
+ if (error != 0) {
+ dev_err(&pdev->dev,
+ "mc_get_version() failed with error %d\n", error);
+ goto error_cleanup_mc_io;
+ }
+
+ dev_info(&pdev->dev,
+ "Freescale Management Complex Firmware version: %u.%u.%u\n",
+ mc_version.major, mc_version.minor, mc_version.revision);
+
+ if (mc_version.major < MC_VER_MAJOR) {
+ dev_err(&pdev->dev,
+ "ERROR: MC firmware version not supported by driver (driver version: %u.%u)\n",
+ MC_VER_MAJOR, MC_VER_MINOR);
+ error = -ENOTSUPP;
+ goto error_cleanup_mc_io;
+ }
+
+ if (mc_version.major > MC_VER_MAJOR) {
+ dev_warn(&pdev->dev,
+ "WARNING: driver may not support newer MC firmware features (driver version: %u.%u)\n",
+ MC_VER_MAJOR, MC_VER_MINOR);
+ }
+
+ error = get_mc_addr_translation_ranges(&pdev->dev,
+ &mc->translation_ranges,
+ &mc->num_translation_ranges);
+ if (error < 0)
+ goto error_cleanup_mc_io;
+
+ error = dpmng_get_container_id(mc_io, &container_id);
+ if (error < 0) {
+ dev_err(&pdev->dev,
+ "dpmng_get_container_id() failed: %d\n", error);
+ goto error_cleanup_mc_io;
+ }
+
+ obj_desc.vendor = FSL_MC_VENDOR_FREESCALE;
+ strcpy(obj_desc.type, "dprc");
+ obj_desc.id = container_id;
+ obj_desc.ver_major = DPRC_VER_MAJOR;
+ obj_desc.ver_minor = DPRC_VER_MINOR;
+ obj_desc.region_count = 0;
+
+ error = fsl_mc_device_add(&obj_desc, mc_io, &pdev->dev, &mc_bus_dev);
+ if (error < 0)
+ goto error_cleanup_mc_io;
+
+ mc->root_mc_bus_dev = mc_bus_dev;
+ return 0;
+
+error_cleanup_mc_io:
+ fsl_destroy_mc_io(mc_io);
+ return error;
+}
+
+/**
+ * fsl_mc_bus_remove - callback invoked when the root MC bus is being
+ * removed
+ */
+static int fsl_mc_bus_remove(struct platform_device *pdev)
+{
+ struct fsl_mc *mc = platform_get_drvdata(pdev);
+
+ if (WARN_ON(&mc->root_mc_bus_dev->dev != fsl_mc_bus_type.dev_root))
+ return -EINVAL;
+
+ fsl_mc_device_remove(mc->root_mc_bus_dev);
+ dev_info(&pdev->dev, "Root MC bus device removed");
+ return 0;
+}
+
+static const struct of_device_id fsl_mc_bus_match_table[] = {
+ {.compatible = "fsl,qoriq-mc",},
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, fsl_mc_bus_match_table);
+
+static struct platform_driver fsl_mc_bus_driver = {
+ .driver = {
+ .name = "fsl_mc_bus",
+ .owner = THIS_MODULE,
+ .pm = NULL,
+ .of_match_table = fsl_mc_bus_match_table,
+ },
+ .probe = fsl_mc_bus_probe,
+ .remove = fsl_mc_bus_remove,
+};
+
+static int __init fsl_mc_bus_driver_init(void)
+{
+ int error;
+
+ mc_dev_cache = kmem_cache_create("fsl_mc_device",
+ sizeof(struct fsl_mc_device), 0, 0,
+ NULL);
+ if (!mc_dev_cache) {
+ pr_err("Could not create fsl_mc_device cache\n");
+ return -ENOMEM;
+ }
+
+ error = bus_register(&fsl_mc_bus_type);
+ if (error < 0) {
+ pr_err("fsl-mc bus type registration failed: %d\n", error);
+ goto error_cleanup_cache;
+ }
+
+ pr_info("fsl-mc bus type registered\n");
+
+ error = platform_driver_register(&fsl_mc_bus_driver);
+ if (error < 0) {
+ pr_err("platform_driver_register() failed: %d\n", error);
+ goto error_cleanup_bus;
+ }
+
+ return 0;
+
+error_cleanup_bus:
+ bus_unregister(&fsl_mc_bus_type);
+
+error_cleanup_cache:
+ kmem_cache_destroy(mc_dev_cache);
+ return error;
+}
+
+postcore_initcall(fsl_mc_bus_driver_init);
+
+static void __exit fsl_mc_bus_driver_exit(void)
+{
+ if (WARN_ON(!mc_dev_cache))
+ return;
+
+ platform_driver_unregister(&fsl_mc_bus_driver);
+ bus_unregister(&fsl_mc_bus_type);
+ kmem_cache_destroy(mc_dev_cache);
+ pr_info("MC bus unregistered\n");
+}
+
+module_exit(fsl_mc_bus_driver_exit);
+
+MODULE_AUTHOR("Freescale Semiconductor Inc.");
+MODULE_DESCRIPTION("Freescale Management Complex (MC) bus driver");
+MODULE_LICENSE("GPL");