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-rw-r--r--drivers/bus/fsl-mc/dprc-driver.c809
1 files changed, 809 insertions, 0 deletions
diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c
new file mode 100644
index 000000000000..52c7e15143d6
--- /dev/null
+++ b/drivers/bus/fsl-mc/dprc-driver.c
@@ -0,0 +1,809 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Freescale data path resource container (DPRC) driver
+ *
+ * Copyright (C) 2014-2016 Freescale Semiconductor, Inc.
+ * Author: German Rivera <German.Rivera@freescale.com>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/msi.h>
+#include <linux/fsl/mc.h>
+
+#include "fsl-mc-private.h"
+
+#define FSL_MC_DPRC_DRIVER_NAME "fsl_mc_dprc"
+
+struct fsl_mc_child_objs {
+ int child_count;
+ struct fsl_mc_obj_desc *child_array;
+};
+
+static bool fsl_mc_device_match(struct fsl_mc_device *mc_dev,
+ struct fsl_mc_obj_desc *obj_desc)
+{
+ return mc_dev->obj_desc.id == obj_desc->id &&
+ strcmp(mc_dev->obj_desc.type, obj_desc->type) == 0;
+
+}
+
+static int __fsl_mc_device_remove_if_not_in_mc(struct device *dev, void *data)
+{
+ int i;
+ struct fsl_mc_child_objs *objs;
+ struct fsl_mc_device *mc_dev;
+
+ mc_dev = to_fsl_mc_device(dev);
+ objs = data;
+
+ for (i = 0; i < objs->child_count; i++) {
+ struct fsl_mc_obj_desc *obj_desc = &objs->child_array[i];
+
+ if (strlen(obj_desc->type) != 0 &&
+ fsl_mc_device_match(mc_dev, obj_desc))
+ break;
+ }
+
+ if (i == objs->child_count)
+ fsl_mc_device_remove(mc_dev);
+
+ return 0;
+}
+
+static int __fsl_mc_device_remove(struct device *dev, void *data)
+{
+ fsl_mc_device_remove(to_fsl_mc_device(dev));
+ return 0;
+}
+
+/**
+ * dprc_remove_devices - Removes devices for objects removed from a DPRC
+ *
+ * @mc_bus_dev: pointer to the fsl-mc device that represents a DPRC object
+ * @obj_desc_array: array of object descriptors for child objects currently
+ * present in the DPRC in the MC.
+ * @num_child_objects_in_mc: number of entries in obj_desc_array
+ *
+ * Synchronizes the state of the Linux bus driver with the actual state of
+ * the MC by removing devices that represent MC objects that have
+ * been dynamically removed in the physical DPRC.
+ */
+static void dprc_remove_devices(struct fsl_mc_device *mc_bus_dev,
+ struct fsl_mc_obj_desc *obj_desc_array,
+ int num_child_objects_in_mc)
+{
+ if (num_child_objects_in_mc != 0) {
+ /*
+ * Remove child objects that are in the DPRC in Linux,
+ * but not in the MC:
+ */
+ struct fsl_mc_child_objs objs;
+
+ objs.child_count = num_child_objects_in_mc;
+ objs.child_array = obj_desc_array;
+ device_for_each_child(&mc_bus_dev->dev, &objs,
+ __fsl_mc_device_remove_if_not_in_mc);
+ } else {
+ /*
+ * There are no child objects for this DPRC in the MC.
+ * So, remove all the child devices from Linux:
+ */
+ device_for_each_child(&mc_bus_dev->dev, NULL,
+ __fsl_mc_device_remove);
+ }
+}
+
+static int __fsl_mc_device_match(struct device *dev, void *data)
+{
+ struct fsl_mc_obj_desc *obj_desc = data;
+ struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
+
+ return fsl_mc_device_match(mc_dev, obj_desc);
+}
+
+static struct fsl_mc_device *fsl_mc_device_lookup(struct fsl_mc_obj_desc
+ *obj_desc,
+ struct fsl_mc_device
+ *mc_bus_dev)
+{
+ struct device *dev;
+
+ dev = device_find_child(&mc_bus_dev->dev, obj_desc,
+ __fsl_mc_device_match);
+
+ return dev ? to_fsl_mc_device(dev) : NULL;
+}
+
+/**
+ * check_plugged_state_change - Check change in an MC object's plugged state
+ *
+ * @mc_dev: pointer to the fsl-mc device for a given MC object
+ * @obj_desc: pointer to the MC object's descriptor in the MC
+ *
+ * If the plugged state has changed from unplugged to plugged, the fsl-mc
+ * device is bound to the corresponding device driver.
+ * If the plugged state has changed from plugged to unplugged, the fsl-mc
+ * device is unbound from the corresponding device driver.
+ */
+static void check_plugged_state_change(struct fsl_mc_device *mc_dev,
+ struct fsl_mc_obj_desc *obj_desc)
+{
+ int error;
+ u32 plugged_flag_at_mc =
+ obj_desc->state & FSL_MC_OBJ_STATE_PLUGGED;
+
+ if (plugged_flag_at_mc !=
+ (mc_dev->obj_desc.state & FSL_MC_OBJ_STATE_PLUGGED)) {
+ if (plugged_flag_at_mc) {
+ mc_dev->obj_desc.state |= FSL_MC_OBJ_STATE_PLUGGED;
+ error = device_attach(&mc_dev->dev);
+ if (error < 0) {
+ dev_err(&mc_dev->dev,
+ "device_attach() failed: %d\n",
+ error);
+ }
+ } else {
+ mc_dev->obj_desc.state &= ~FSL_MC_OBJ_STATE_PLUGGED;
+ device_release_driver(&mc_dev->dev);
+ }
+ }
+}
+
+/**
+ * dprc_add_new_devices - Adds devices to the logical bus for a DPRC
+ *
+ * @mc_bus_dev: pointer to the fsl-mc device that represents a DPRC object
+ * @obj_desc_array: array of device descriptors for child devices currently
+ * present in the physical DPRC.
+ * @num_child_objects_in_mc: number of entries in obj_desc_array
+ *
+ * Synchronizes the state of the Linux bus driver with the actual
+ * state of the MC by adding objects that have been newly discovered
+ * in the physical DPRC.
+ */
+static void dprc_add_new_devices(struct fsl_mc_device *mc_bus_dev,
+ struct fsl_mc_obj_desc *obj_desc_array,
+ int num_child_objects_in_mc)
+{
+ int error;
+ int i;
+
+ for (i = 0; i < num_child_objects_in_mc; i++) {
+ struct fsl_mc_device *child_dev;
+ struct fsl_mc_obj_desc *obj_desc = &obj_desc_array[i];
+
+ if (strlen(obj_desc->type) == 0)
+ continue;
+
+ /*
+ * Check if device is already known to Linux:
+ */
+ child_dev = fsl_mc_device_lookup(obj_desc, mc_bus_dev);
+ if (child_dev) {
+ check_plugged_state_change(child_dev, obj_desc);
+ put_device(&child_dev->dev);
+ continue;
+ }
+
+ error = fsl_mc_device_add(obj_desc, NULL, &mc_bus_dev->dev,
+ &child_dev);
+ if (error < 0)
+ continue;
+ }
+}
+
+/**
+ * dprc_scan_objects - Discover objects in a DPRC
+ *
+ * @mc_bus_dev: pointer to the fsl-mc device that represents a DPRC object
+ * @total_irq_count: If argument is provided the function populates the
+ * total number of IRQs created by objects in the DPRC.
+ *
+ * Detects objects added and removed from a DPRC and synchronizes the
+ * state of the Linux bus driver, MC by adding and removing
+ * devices accordingly.
+ * Two types of devices can be found in a DPRC: allocatable objects (e.g.,
+ * dpbp, dpmcp) and non-allocatable devices (e.g., dprc, dpni).
+ * All allocatable devices needed to be probed before all non-allocatable
+ * devices, to ensure that device drivers for non-allocatable
+ * devices can allocate any type of allocatable devices.
+ * That is, we need to ensure that the corresponding resource pools are
+ * populated before they can get allocation requests from probe callbacks
+ * of the device drivers for the non-allocatable devices.
+ */
+static int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
+ unsigned int *total_irq_count)
+{
+ int num_child_objects;
+ int dprc_get_obj_failures;
+ int error;
+ unsigned int irq_count = mc_bus_dev->obj_desc.irq_count;
+ struct fsl_mc_obj_desc *child_obj_desc_array = NULL;
+ struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev);
+
+ error = dprc_get_obj_count(mc_bus_dev->mc_io,
+ 0,
+ mc_bus_dev->mc_handle,
+ &num_child_objects);
+ if (error < 0) {
+ dev_err(&mc_bus_dev->dev, "dprc_get_obj_count() failed: %d\n",
+ error);
+ return error;
+ }
+
+ if (num_child_objects != 0) {
+ int i;
+
+ child_obj_desc_array =
+ devm_kmalloc_array(&mc_bus_dev->dev, num_child_objects,
+ sizeof(*child_obj_desc_array),
+ GFP_KERNEL);
+ if (!child_obj_desc_array)
+ return -ENOMEM;
+
+ /*
+ * Discover objects currently present in the physical DPRC:
+ */
+ dprc_get_obj_failures = 0;
+ for (i = 0; i < num_child_objects; i++) {
+ struct fsl_mc_obj_desc *obj_desc =
+ &child_obj_desc_array[i];
+
+ error = dprc_get_obj(mc_bus_dev->mc_io,
+ 0,
+ mc_bus_dev->mc_handle,
+ i, obj_desc);
+ if (error < 0) {
+ dev_err(&mc_bus_dev->dev,
+ "dprc_get_obj(i=%d) failed: %d\n",
+ i, error);
+ /*
+ * Mark the obj entry as "invalid", by using the
+ * empty string as obj type:
+ */
+ obj_desc->type[0] = '\0';
+ obj_desc->id = error;
+ dprc_get_obj_failures++;
+ continue;
+ }
+
+ /*
+ * add a quirk for all versions of dpsec < 4.0...none
+ * are coherent regardless of what the MC reports.
+ */
+ if ((strcmp(obj_desc->type, "dpseci") == 0) &&
+ (obj_desc->ver_major < 4))
+ obj_desc->flags |=
+ FSL_MC_OBJ_FLAG_NO_MEM_SHAREABILITY;
+
+ irq_count += obj_desc->irq_count;
+ dev_dbg(&mc_bus_dev->dev,
+ "Discovered object: type %s, id %d\n",
+ obj_desc->type, obj_desc->id);
+ }
+
+ if (dprc_get_obj_failures != 0) {
+ dev_err(&mc_bus_dev->dev,
+ "%d out of %d devices could not be retrieved\n",
+ dprc_get_obj_failures, num_child_objects);
+ }
+ }
+
+ /*
+ * Allocate IRQ's before binding the scanned devices with their
+ * respective drivers.
+ */
+ if (dev_get_msi_domain(&mc_bus_dev->dev) && !mc_bus->irq_resources) {
+ if (irq_count > FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS) {
+ dev_warn(&mc_bus_dev->dev,
+ "IRQs needed (%u) exceed IRQs preallocated (%u)\n",
+ irq_count, FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS);
+ }
+
+ error = fsl_mc_populate_irq_pool(mc_bus,
+ FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS);
+ if (error < 0)
+ return error;
+ }
+
+ if (total_irq_count)
+ *total_irq_count = irq_count;
+
+ dprc_remove_devices(mc_bus_dev, child_obj_desc_array,
+ num_child_objects);
+
+ dprc_add_new_devices(mc_bus_dev, child_obj_desc_array,
+ num_child_objects);
+
+ if (child_obj_desc_array)
+ devm_kfree(&mc_bus_dev->dev, child_obj_desc_array);
+
+ return 0;
+}
+
+/**
+ * dprc_scan_container - Scans a physical DPRC and synchronizes Linux bus state
+ *
+ * @mc_bus_dev: pointer to the fsl-mc device that represents a DPRC object
+ *
+ * Scans the physical DPRC and synchronizes the state of the Linux
+ * bus driver with the actual state of the MC by adding and removing
+ * devices as appropriate.
+ */
+static int dprc_scan_container(struct fsl_mc_device *mc_bus_dev)
+{
+ int error;
+ struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev);
+
+ fsl_mc_init_all_resource_pools(mc_bus_dev);
+
+ /*
+ * Discover objects in the DPRC:
+ */
+ mutex_lock(&mc_bus->scan_mutex);
+ error = dprc_scan_objects(mc_bus_dev, NULL);
+ mutex_unlock(&mc_bus->scan_mutex);
+ if (error < 0) {
+ fsl_mc_cleanup_all_resource_pools(mc_bus_dev);
+ return error;
+ }
+
+ return 0;
+}
+
+/**
+ * dprc_irq0_handler - Regular ISR for DPRC interrupt 0
+ *
+ * @irq: IRQ number of the interrupt being handled
+ * @arg: Pointer to device structure
+ */
+static irqreturn_t dprc_irq0_handler(int irq_num, void *arg)
+{
+ return IRQ_WAKE_THREAD;
+}
+
+/**
+ * dprc_irq0_handler_thread - Handler thread function for DPRC interrupt 0
+ *
+ * @irq: IRQ number of the interrupt being handled
+ * @arg: Pointer to device structure
+ */
+static irqreturn_t dprc_irq0_handler_thread(int irq_num, void *arg)
+{
+ int error;
+ u32 status;
+ struct device *dev = arg;
+ struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
+ struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
+ struct fsl_mc_io *mc_io = mc_dev->mc_io;
+ struct msi_desc *msi_desc = mc_dev->irqs[0]->msi_desc;
+
+ dev_dbg(dev, "DPRC IRQ %d triggered on CPU %u\n",
+ irq_num, smp_processor_id());
+
+ if (!(mc_dev->flags & FSL_MC_IS_DPRC))
+ return IRQ_HANDLED;
+
+ mutex_lock(&mc_bus->scan_mutex);
+ if (!msi_desc || msi_desc->irq != (u32)irq_num)
+ goto out;
+
+ status = 0;
+ error = dprc_get_irq_status(mc_io, 0, mc_dev->mc_handle, 0,
+ &status);
+ if (error < 0) {
+ dev_err(dev,
+ "dprc_get_irq_status() failed: %d\n", error);
+ goto out;
+ }
+
+ error = dprc_clear_irq_status(mc_io, 0, mc_dev->mc_handle, 0,
+ status);
+ if (error < 0) {
+ dev_err(dev,
+ "dprc_clear_irq_status() failed: %d\n", error);
+ goto out;
+ }
+
+ if (status & (DPRC_IRQ_EVENT_OBJ_ADDED |
+ DPRC_IRQ_EVENT_OBJ_REMOVED |
+ DPRC_IRQ_EVENT_CONTAINER_DESTROYED |
+ DPRC_IRQ_EVENT_OBJ_DESTROYED |
+ DPRC_IRQ_EVENT_OBJ_CREATED)) {
+ unsigned int irq_count;
+
+ error = dprc_scan_objects(mc_dev, &irq_count);
+ if (error < 0) {
+ /*
+ * If the error is -ENXIO, we ignore it, as it indicates
+ * that the object scan was aborted, as we detected that
+ * an object was removed from the DPRC in the MC, while
+ * we were scanning the DPRC.
+ */
+ if (error != -ENXIO) {
+ dev_err(dev, "dprc_scan_objects() failed: %d\n",
+ error);
+ }
+
+ goto out;
+ }
+
+ if (irq_count > FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS) {
+ dev_warn(dev,
+ "IRQs needed (%u) exceed IRQs preallocated (%u)\n",
+ irq_count, FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS);
+ }
+ }
+
+out:
+ mutex_unlock(&mc_bus->scan_mutex);
+ return IRQ_HANDLED;
+}
+
+/*
+ * Disable and clear interrupt for a given DPRC object
+ */
+static int disable_dprc_irq(struct fsl_mc_device *mc_dev)
+{
+ int error;
+ struct fsl_mc_io *mc_io = mc_dev->mc_io;
+
+ /*
+ * Disable generation of interrupt, while we configure it:
+ */
+ error = dprc_set_irq_enable(mc_io, 0, mc_dev->mc_handle, 0, 0);
+ if (error < 0) {
+ dev_err(&mc_dev->dev,
+ "Disabling DPRC IRQ failed: dprc_set_irq_enable() failed: %d\n",
+ error);
+ return error;
+ }
+
+ /*
+ * Disable all interrupt causes for the interrupt:
+ */
+ error = dprc_set_irq_mask(mc_io, 0, mc_dev->mc_handle, 0, 0x0);
+ if (error < 0) {
+ dev_err(&mc_dev->dev,
+ "Disabling DPRC IRQ failed: dprc_set_irq_mask() failed: %d\n",
+ error);
+ return error;
+ }
+
+ /*
+ * Clear any leftover interrupts:
+ */
+ error = dprc_clear_irq_status(mc_io, 0, mc_dev->mc_handle, 0, ~0x0U);
+ if (error < 0) {
+ dev_err(&mc_dev->dev,
+ "Disabling DPRC IRQ failed: dprc_clear_irq_status() failed: %d\n",
+ error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int register_dprc_irq_handler(struct fsl_mc_device *mc_dev)
+{
+ int error;
+ struct fsl_mc_device_irq *irq = mc_dev->irqs[0];
+
+ /*
+ * NOTE: devm_request_threaded_irq() invokes the device-specific
+ * function that programs the MSI physically in the device
+ */
+ error = devm_request_threaded_irq(&mc_dev->dev,
+ irq->msi_desc->irq,
+ dprc_irq0_handler,
+ dprc_irq0_handler_thread,
+ IRQF_NO_SUSPEND | IRQF_ONESHOT,
+ dev_name(&mc_dev->dev),
+ &mc_dev->dev);
+ if (error < 0) {
+ dev_err(&mc_dev->dev,
+ "devm_request_threaded_irq() failed: %d\n",
+ error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int enable_dprc_irq(struct fsl_mc_device *mc_dev)
+{
+ int error;
+
+ /*
+ * Enable all interrupt causes for the interrupt:
+ */
+ error = dprc_set_irq_mask(mc_dev->mc_io, 0, mc_dev->mc_handle, 0,
+ ~0x0u);
+ if (error < 0) {
+ dev_err(&mc_dev->dev,
+ "Enabling DPRC IRQ failed: dprc_set_irq_mask() failed: %d\n",
+ error);
+
+ return error;
+ }
+
+ /*
+ * Enable generation of the interrupt:
+ */
+ error = dprc_set_irq_enable(mc_dev->mc_io, 0, mc_dev->mc_handle, 0, 1);
+ if (error < 0) {
+ dev_err(&mc_dev->dev,
+ "Enabling DPRC IRQ failed: dprc_set_irq_enable() failed: %d\n",
+ error);
+
+ return error;
+ }
+
+ return 0;
+}
+
+/*
+ * Setup interrupt for a given DPRC device
+ */
+static int dprc_setup_irq(struct fsl_mc_device *mc_dev)
+{
+ int error;
+
+ error = fsl_mc_allocate_irqs(mc_dev);
+ if (error < 0)
+ return error;
+
+ error = disable_dprc_irq(mc_dev);
+ if (error < 0)
+ goto error_free_irqs;
+
+ error = register_dprc_irq_handler(mc_dev);
+ if (error < 0)
+ goto error_free_irqs;
+
+ error = enable_dprc_irq(mc_dev);
+ if (error < 0)
+ goto error_free_irqs;
+
+ return 0;
+
+error_free_irqs:
+ fsl_mc_free_irqs(mc_dev);
+ return error;
+}
+
+/**
+ * dprc_probe - callback invoked when a DPRC is being bound to this driver
+ *
+ * @mc_dev: Pointer to fsl-mc device representing a DPRC
+ *
+ * It opens the physical DPRC in the MC.
+ * It scans the DPRC to discover the MC objects contained in it.
+ * It creates the interrupt pool for the MC bus associated with the DPRC.
+ * It configures the interrupts for the DPRC device itself.
+ */
+static int dprc_probe(struct fsl_mc_device *mc_dev)
+{
+ int error;
+ size_t region_size;
+ struct device *parent_dev = mc_dev->dev.parent;
+ struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
+ bool mc_io_created = false;
+ bool msi_domain_set = false;
+ u16 major_ver, minor_ver;
+
+ if (!is_fsl_mc_bus_dprc(mc_dev))
+ return -EINVAL;
+
+ if (dev_get_msi_domain(&mc_dev->dev))
+ return -EINVAL;
+
+ if (!mc_dev->mc_io) {
+ /*
+ * This is a child DPRC:
+ */
+ if (!dev_is_fsl_mc(parent_dev))
+ return -EINVAL;
+
+ if (mc_dev->obj_desc.region_count == 0)
+ return -EINVAL;
+
+ region_size = resource_size(mc_dev->regions);
+
+ error = fsl_create_mc_io(&mc_dev->dev,
+ mc_dev->regions[0].start,
+ region_size,
+ NULL,
+ FSL_MC_IO_ATOMIC_CONTEXT_PORTAL,
+ &mc_dev->mc_io);
+ if (error < 0)
+ return error;
+
+ mc_io_created = true;
+
+ /*
+ * Inherit parent MSI domain:
+ */
+ dev_set_msi_domain(&mc_dev->dev,
+ dev_get_msi_domain(parent_dev));
+ msi_domain_set = true;
+ } else {
+ /*
+ * This is a root DPRC
+ */
+ struct irq_domain *mc_msi_domain;
+
+ if (dev_is_fsl_mc(parent_dev))
+ return -EINVAL;
+
+ error = fsl_mc_find_msi_domain(parent_dev,
+ &mc_msi_domain);
+ if (error < 0) {
+ dev_warn(&mc_dev->dev,
+ "WARNING: MC bus without interrupt support\n");
+ } else {
+ dev_set_msi_domain(&mc_dev->dev, mc_msi_domain);
+ msi_domain_set = true;
+ }
+ }
+
+ error = dprc_open(mc_dev->mc_io, 0, mc_dev->obj_desc.id,
+ &mc_dev->mc_handle);
+ if (error < 0) {
+ dev_err(&mc_dev->dev, "dprc_open() failed: %d\n", error);
+ goto error_cleanup_msi_domain;
+ }
+
+ error = dprc_get_attributes(mc_dev->mc_io, 0, mc_dev->mc_handle,
+ &mc_bus->dprc_attr);
+ if (error < 0) {
+ dev_err(&mc_dev->dev, "dprc_get_attributes() failed: %d\n",
+ error);
+ goto error_cleanup_open;
+ }
+
+ error = dprc_get_api_version(mc_dev->mc_io, 0,
+ &major_ver,
+ &minor_ver);
+ if (error < 0) {
+ dev_err(&mc_dev->dev, "dprc_get_api_version() failed: %d\n",
+ error);
+ goto error_cleanup_open;
+ }
+
+ if (major_ver < DPRC_MIN_VER_MAJOR ||
+ (major_ver == DPRC_MIN_VER_MAJOR &&
+ minor_ver < DPRC_MIN_VER_MINOR)) {
+ dev_err(&mc_dev->dev,
+ "ERROR: DPRC version %d.%d not supported\n",
+ major_ver, minor_ver);
+ error = -ENOTSUPP;
+ goto error_cleanup_open;
+ }
+
+ mutex_init(&mc_bus->scan_mutex);
+
+ /*
+ * Discover MC objects in DPRC object:
+ */
+ error = dprc_scan_container(mc_dev);
+ if (error < 0)
+ goto error_cleanup_open;
+
+ /*
+ * Configure interrupt for the DPRC object associated with this MC bus:
+ */
+ error = dprc_setup_irq(mc_dev);
+ if (error < 0)
+ goto error_cleanup_open;
+
+ dev_info(&mc_dev->dev, "DPRC device bound to driver");
+ return 0;
+
+error_cleanup_open:
+ (void)dprc_close(mc_dev->mc_io, 0, mc_dev->mc_handle);
+
+error_cleanup_msi_domain:
+ if (msi_domain_set)
+ dev_set_msi_domain(&mc_dev->dev, NULL);
+
+ if (mc_io_created) {
+ fsl_destroy_mc_io(mc_dev->mc_io);
+ mc_dev->mc_io = NULL;
+ }
+
+ return error;
+}
+
+/*
+ * Tear down interrupt for a given DPRC object
+ */
+static void dprc_teardown_irq(struct fsl_mc_device *mc_dev)
+{
+ struct fsl_mc_device_irq *irq = mc_dev->irqs[0];
+
+ (void)disable_dprc_irq(mc_dev);
+
+ devm_free_irq(&mc_dev->dev, irq->msi_desc->irq, &mc_dev->dev);
+
+ fsl_mc_free_irqs(mc_dev);
+}
+
+/**
+ * dprc_remove - callback invoked when a DPRC is being unbound from this driver
+ *
+ * @mc_dev: Pointer to fsl-mc device representing the DPRC
+ *
+ * It removes the DPRC's child objects from Linux (not from the MC) and
+ * closes the DPRC device in the MC.
+ * It tears down the interrupts that were configured for the DPRC device.
+ * It destroys the interrupt pool associated with this MC bus.
+ */
+static int dprc_remove(struct fsl_mc_device *mc_dev)
+{
+ int error;
+ struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
+
+ if (!is_fsl_mc_bus_dprc(mc_dev))
+ return -EINVAL;
+ if (!mc_dev->mc_io)
+ return -EINVAL;
+
+ if (!mc_bus->irq_resources)
+ return -EINVAL;
+
+ if (dev_get_msi_domain(&mc_dev->dev))
+ dprc_teardown_irq(mc_dev);
+
+ device_for_each_child(&mc_dev->dev, NULL, __fsl_mc_device_remove);
+
+ if (dev_get_msi_domain(&mc_dev->dev)) {
+ fsl_mc_cleanup_irq_pool(mc_bus);
+ dev_set_msi_domain(&mc_dev->dev, NULL);
+ }
+
+ fsl_mc_cleanup_all_resource_pools(mc_dev);
+
+ error = dprc_close(mc_dev->mc_io, 0, mc_dev->mc_handle);
+ if (error < 0)
+ dev_err(&mc_dev->dev, "dprc_close() failed: %d\n", error);
+
+ if (!fsl_mc_is_root_dprc(&mc_dev->dev)) {
+ fsl_destroy_mc_io(mc_dev->mc_io);
+ mc_dev->mc_io = NULL;
+ }
+
+ dev_info(&mc_dev->dev, "DPRC device unbound from driver");
+ return 0;
+}
+
+static const struct fsl_mc_device_id match_id_table[] = {
+ {
+ .vendor = FSL_MC_VENDOR_FREESCALE,
+ .obj_type = "dprc"},
+ {.vendor = 0x0},
+};
+
+static struct fsl_mc_driver dprc_driver = {
+ .driver = {
+ .name = FSL_MC_DPRC_DRIVER_NAME,
+ .owner = THIS_MODULE,
+ .pm = NULL,
+ },
+ .match_id_table = match_id_table,
+ .probe = dprc_probe,
+ .remove = dprc_remove,
+};
+
+int __init dprc_driver_init(void)
+{
+ return fsl_mc_driver_register(&dprc_driver);
+}
+
+void dprc_driver_exit(void)
+{
+ fsl_mc_driver_unregister(&dprc_driver);
+}