[PATCH 2/3 v6] drivers/bus: Freescale Management Complex (fsl-mc) bus driver

From: J. German Rivera
Date: Fri Jan 16 2015 - 20:20:08 EST

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@xxxxxxxxxxxxx>
Signed-off-by: Stuart Yoder <stuart.yoder@xxxxxxxxxxxxx>
---
Changes addressed in v6:
- Fixed new checkpatch warnings

Changes addressed in v5:
- Addressed comments from Alex Graf:
* Renamed dprc_get_container_id() call as dpmng_get_container_id().
* Added TODO comment to use the 'ranges' property of the
fsl-mc DT node.

Changes addressed in v4:
- Addressed comments from Alex Graf:
* Added missing scope limitations and more descriptive help
text for the FSL_MC_BUS config option.
- Fixed bug related to setting fsl_mc_bus_type.dev_root too
late.

Changes in v3:
- Addressed changes from Kim Phillips:
* Renamed files:
drivers/bus/fsl-mc/fsl_mc_bus.c -> drivers/bus/fsl-mc/mc-bus.c
include/linux/fsl_mc.h -> include/linux/fsl/mc.h
include/linux/fsl_mc_private.h -> include/linux/fsl/mc-private.h

- Addressed comments from Timur Tabi:
* Changed all functions that had goto out/error when no common cleanup
was done, to just have multiple return points.
* Replaced error cleanup boolean flags with multiple exit points.

Changes in v2:
- Addressed comment from Joe Perches:
* Changed pr_debug to dev_dbg in fsl_mc_bus_match

- Addressed comments from Kim Phillips and Alex Graf:
* Changed version check to allow the driver to run with MC
firmware that has major version number greater than or equal
to the driver's major version number.
* Removed minor version check

- Removed unused variable parent_dev in fsl_mc_device_remove

drivers/bus/Kconfig | 3 +
drivers/bus/Makefile | 3 +
drivers/bus/fsl-mc/Kconfig | 24 ++
drivers/bus/fsl-mc/Makefile | 14 +
drivers/bus/fsl-mc/mc-bus.c | 585 +++++++++++++++++++++++++++++++++++++++++
include/linux/fsl/mc-private.h | 33 +++
include/linux/fsl/mc.h | 137 ++++++++++
7 files changed, 799 insertions(+)
create mode 100644 drivers/bus/fsl-mc/Kconfig
create mode 100644 drivers/bus/fsl-mc/Makefile
create mode 100644 drivers/bus/fsl-mc/mc-bus.c
create mode 100644 include/linux/fsl/mc-private.h
create mode 100644 include/linux/fsl/mc.h

diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
index b99729e..dde3ec2 100644
--- a/drivers/bus/Kconfig
+++ b/drivers/bus/Kconfig
@@ -67,4 +67,7 @@ config VEXPRESS_CONFIG
help
Platform configuration infrastructure for the ARM Ltd.
Versatile Express.
+
+source "drivers/bus/fsl-mc/Kconfig"
+
endmenu
diff --git a/drivers/bus/Makefile b/drivers/bus/Makefile
index 2973c18..6abcab1 100644
--- a/drivers/bus/Makefile
+++ b/drivers/bus/Makefile
@@ -15,3 +15,6 @@ obj-$(CONFIG_ARM_CCI) += arm-cci.o
obj-$(CONFIG_ARM_CCN) += arm-ccn.o

obj-$(CONFIG_VEXPRESS_CONFIG) += vexpress-config.o
+
+# Freescale Management Complex (MC) bus drivers
+obj-$(CONFIG_FSL_MC_BUS) += fsl-mc/
diff --git a/drivers/bus/fsl-mc/Kconfig b/drivers/bus/fsl-mc/Kconfig
new file mode 100644
index 0000000..0d779d9
--- /dev/null
+++ b/drivers/bus/fsl-mc/Kconfig
@@ -0,0 +1,24 @@
+#
+# Freescale Management Complex (MC) bus drivers
+#
+# Copyright (C) 2014 Freescale Semiconductor, Inc.
+#
+# This file is released under the GPLv2
+#
+
+config FSL_MC_BUS
+ tristate "Freescale Management Complex (MC) bus driver"
+ depends on OF && ARM64
+ help
+ Driver to enable the bus infrastructure for the Freescale
+ QorIQ Management Complex (fsl-mc). The fsl-mc is a hardware
+ module of the QorIQ LS2 SoCs, that does resource management
+ for hardware building-blocks in the SoC that can be used
+ to dynamically create networking hardware objects such as
+ network interfaces (NICs), crypto accelerator instances,
+ or L2 switches.
+
+ Only enable this option when building the kernel for
+ Freescale QorQIQ LS2xxxx SoCs.
+
+
diff --git a/drivers/bus/fsl-mc/Makefile b/drivers/bus/fsl-mc/Makefile
new file mode 100644
index 0000000..decd339
--- /dev/null
+++ b/drivers/bus/fsl-mc/Makefile
@@ -0,0 +1,14 @@
+#
+# Freescale Management Complex (MC) bus drivers
+#
+# Copyright (C) 2014 Freescale Semiconductor, Inc.
+#
+# This file is released under the GPLv2
+#
+obj-$(CONFIG_FSL_MC_BUS) += mc-bus-driver.o
+
+mc-bus-driver-objs := mc-bus.o \
+ mc-sys.o \
+ dprc.o \
+ dpmng.o
+
diff --git a/drivers/bus/fsl-mc/mc-bus.c b/drivers/bus/fsl-mc/mc-bus.c
new file mode 100644
index 0000000..e6f3d62
--- /dev/null
+++ b/drivers/bus/fsl-mc/mc-bus.c
@@ -0,0 +1,585 @@
+/*
+ * Freescale Management Complex (MC) bus driver
+ *
+ * Copyright (C) 2014 Freescale Semiconductor, Inc.
+ * Author: German Rivera <German.Rivera@xxxxxxxxxxxxx>
+ *
+ * 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 <linux/fsl/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 <linux/fsl/dpmng.h>
+#include <linux/fsl/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 (!mc_drv->match_id_table)
+ goto out;
+
+ if (WARN_ON(!fsl_mc_bus_type.dev_root))
+ 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;
+
+ /*
+ * Set default driver callbacks, if not set by the child driver:
+ */
+ 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 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, &region_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);
+ regions[i].start = region_desc.base_paddr;
+ regions[i].end = region_desc.base_paddr + 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_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;
+
+ /*
+ * DPRC devices must have a dedicated MC portal
+ */
+ if (WARN_ON(strcmp(obj_desc->type, "dprc") == 0 && !mc_io))
+ return -EINVAL;
+
+ mc_dev = kmem_cache_zalloc(mc_dev_cache, GFP_KERNEL);
+ if (!mc_dev) {
+ dev_err(parent_dev,
+ "No memory to allocate fsl_mc_device\n");
+ 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
+ */
+ 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;
+ if (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);
+ 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)
+{
+ 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) {
+ fsl_destroy_mc_io(mc_dev->mc_io);
+ if (&mc_dev->dev == fsl_mc_bus_type.dev_root)
+ fsl_mc_bus_type.dev_root = NULL;
+ }
+
+ mc_dev->mc_io = NULL;
+ kmem_cache_free(mc_dev_cache, mc_dev);
+}
+EXPORT_SYMBOL_GPL(fsl_mc_device_remove);
+
+/**
+ * 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_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");
+
+ /*
+ * TODO: When the 'ranges' property gets added to the fsl-mc
+ * node in the device tree, we need to use it here, to validate
+ * the MC portal base address. For example, given the following
+ * ranges property:
+ * ranges = <0x8 0x0 0x8 0x0 0x20000000>;
+ *
+ * we could check that the portal address falls in the
+ * 512MiB region that starts at 0x8_0000_0000 in the physical
+ * address map. Also, we can use the 'range' property to translate
+ * the MC portal address from the 'reg' propertu, into a physical,
+ * if in the future the MC portal address specified specified
+ * in the 'reg' property becomes an MC-relative address (offset).
+ */
+ 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 = 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;
+
+ platform_set_drvdata(pdev, 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_device *mc_bus_dev = platform_get_drvdata(pdev);
+
+ if (WARN_ON(&mc_bus_dev->dev != fsl_mc_bus_type.dev_root))
+ return -EINVAL;
+
+ fsl_mc_device_remove(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");
diff --git a/include/linux/fsl/mc-private.h b/include/linux/fsl/mc-private.h
new file mode 100644
index 0000000..604832a
--- /dev/null
+++ b/include/linux/fsl/mc-private.h
@@ -0,0 +1,33 @@
+/*
+ * Freescale Management Complex (MC) bus private declarations
+ *
+ * Copyright (C) 2014 Freescale Semiconductor, Inc.
+ * Author: German Rivera <German.Rivera@xxxxxxxxxxxxx>
+ *
+ * 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.
+ */
+#ifndef _FSL_MC_PRIVATE_H_
+#define _FSL_MC_PRIVATE_H_
+
+#include <linux/fsl/mc.h>
+#include <linux/mutex.h>
+#include <linux/stringify.h>
+
+#define FSL_MC_DEVICE_MATCH(_mc_dev, _obj_desc) \
+ (strcmp((_mc_dev)->obj_desc.type, (_obj_desc)->type) == 0 && \
+ (_mc_dev)->obj_desc.id == (_obj_desc)->id)
+
+#define FSL_MC_IS_ALLOCATABLE(_obj_type) \
+ (strcmp(_obj_type, "dpbp") == 0 || \
+ strcmp(_obj_type, "dpcon") == 0)
+
+int __must_check 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);
+
+void fsl_mc_device_remove(struct fsl_mc_device *mc_dev);
+
+#endif /* _FSL_MC_PRIVATE_H_ */
diff --git a/include/linux/fsl/mc.h b/include/linux/fsl/mc.h
new file mode 100644
index 0000000..5d89d1bf
--- /dev/null
+++ b/include/linux/fsl/mc.h
@@ -0,0 +1,137 @@
+/*
+ * Freescale Management Complex (MC) bus public interface
+ *
+ * Copyright (C) 2014 Freescale Semiconductor, Inc.
+ * Author: German Rivera <German.Rivera@xxxxxxxxxxxxx>
+ *
+ * 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.
+ */
+#ifndef _FSL_MC_H_
+#define _FSL_MC_H_
+
+#include <linux/device.h>
+#include <linux/mod_devicetable.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/fsl/dprc.h>
+
+#define FSL_MC_VENDOR_FREESCALE 0x1957
+
+struct fsl_mc_device;
+struct fsl_mc_io;
+
+/**
+ * struct fsl_mc_driver - MC object device driver object
+ * @driver: Generic device driver
+ * @match_id_table: table of supported device matching Ids
+ * @probe: Function called when a device is added
+ * @remove: Function called when a device is removed
+ * @shutdown: Function called at shutdown time to quiesce the device
+ * @suspend: Function called when a device is stopped
+ * @resume: Function called when a device is resumed
+ *
+ * Generic DPAA device driver object for device drivers that are registered
+ * with a DPRC bus. This structure is to be embedded in each device-specific
+ * driver structure.
+ */
+struct fsl_mc_driver {
+ struct device_driver driver;
+ const struct fsl_mc_device_match_id *match_id_table;
+ int (*probe)(struct fsl_mc_device *dev);
+ int (*remove)(struct fsl_mc_device *dev);
+ void (*shutdown)(struct fsl_mc_device *dev);
+ int (*suspend)(struct fsl_mc_device *dev, pm_message_t state);
+ int (*resume)(struct fsl_mc_device *dev);
+};
+
+#define to_fsl_mc_driver(_drv) \
+ container_of(_drv, struct fsl_mc_driver, driver)
+
+/**
+ * struct fsl_mc_device_match_id - MC object device Id entry for driver matching
+ * @vendor: vendor ID
+ * @obj_type: MC object type
+ * @ver_major: MC object version major number
+ * @ver_minor: MC object version minor number
+ *
+ * Type of entries in the "device Id" table for MC object devices supported by
+ * a MC object device driver. The last entry of the table has vendor set to 0x0
+ */
+struct fsl_mc_device_match_id {
+ uint16_t vendor;
+ const char obj_type[16];
+ uint32_t ver_major;
+ uint32_t ver_minor;
+};
+
+/**
+ * Bit masks for a MC object device (struct fsl_mc_device) flags
+ */
+#define FSL_MC_IS_DPRC 0x0001
+
+/**
+ * Default DMA mask for devices on a fsl-mc bus
+ */
+#define FSL_MC_DEFAULT_DMA_MASK (~0ULL)
+
+/**
+ * struct fsl_mc_device - MC object device object
+ * @dev: Linux driver model device object
+ * @dma_mask: Default DMA mask
+ * @flags: MC object device flags
+ * @icid: Isolation context ID for the device
+ * @mc_handle: MC handle for the corresponding MC object opened
+ * @mc_io: Pointer to MC IO object assigned to this device or
+ * NULL if none.
+ * @obj_desc: MC description of the DPAA device
+ * @regions: pointer to array of MMIO region entries
+ *
+ * Generic device object for MC object devices that are "attached" to a
+ * MC bus.
+ *
+ * NOTES:
+ * - For a non-DPRC object its icid is the same as its parent DPRC's icid.
+ * - The SMMU notifier callback gets invoked after device_add() has been
+ * called for an MC object device, but before the device-specific probe
+ * callback gets called.
+ */
+struct fsl_mc_device {
+ struct device dev;
+ uint64_t dma_mask;
+ uint16_t flags;
+ uint16_t icid;
+ uint16_t mc_handle;
+ struct fsl_mc_io *mc_io;
+ struct dprc_obj_desc obj_desc;
+ struct resource *regions;
+};
+
+#define to_fsl_mc_device(_dev) \
+ container_of(_dev, struct fsl_mc_device, dev)
+
+/*
+ * module_fsl_mc_driver() - Helper macro for drivers that don't do
+ * anything special in module init/exit. This eliminates a lot of
+ * boilerplate. Each module may only use this macro once, and
+ * calling it replaces module_init() and module_exit()
+ */
+#define module_fsl_mc_driver(__fsl_mc_driver) \
+ module_driver(__fsl_mc_driver, fsl_mc_driver_register, \
+ fsl_mc_driver_unregister)
+
+/*
+ * Macro to avoid include chaining to get THIS_MODULE
+ */
+#define fsl_mc_driver_register(drv) \
+ __fsl_mc_driver_register(drv, THIS_MODULE)
+
+int __must_check __fsl_mc_driver_register(struct fsl_mc_driver *fsl_mc_driver,
+ struct module *owner);
+
+void fsl_mc_driver_unregister(struct fsl_mc_driver *driver);
+
+extern struct bus_type fsl_mc_bus_type;
+
+#endif /* _FSL_MC_H_ */
--
2.2.2

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