mirror of https://gitee.com/openkylin/linux.git
Merge branch 'acpi-pm'
* acpi-pm: ACPI / bus: Move duplicate code to a separate new function mfd: Add support for Intel Sunrisepoint LPSS devices dmaengine: add a driver for Intel integrated DMA 64-bit mfd: make mfd_remove_devices() iterate in reverse order driver core: implement device_for_each_child_reverse() klist: implement klist_prev() Driver core: wakeup the parent device before trying probe ACPI / PM: Attach ACPI power domain only once PM / QoS: Make it possible to expose device latency tolerance to userspace ACPI / PM: Update the copyright notice and description of power.c
This commit is contained in:
Rafael J. Wysocki
commit
ef5f5de069
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@ -482,6 +482,43 @@ static void acpi_device_remove_notify_handler(struct acpi_device *device)
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Device Matching
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-------------------------------------------------------------------------- */
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static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
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const struct device *dev)
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{
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struct mutex *physical_node_lock = &adev->physical_node_lock;
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mutex_lock(physical_node_lock);
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if (list_empty(&adev->physical_node_list)) {
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adev = NULL;
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} else {
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const struct acpi_device_physical_node *node;
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node = list_first_entry(&adev->physical_node_list,
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struct acpi_device_physical_node, node);
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if (node->dev != dev)
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adev = NULL;
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}
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mutex_unlock(physical_node_lock);
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return adev;
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}
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/**
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* acpi_device_is_first_physical_node - Is given dev first physical node
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* @adev: ACPI companion device
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* @dev: Physical device to check
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*
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* Function checks if given @dev is the first physical devices attached to
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* the ACPI companion device. This distinction is needed in some cases
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* where the same companion device is shared between many physical devices.
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*
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* Note that the caller have to provide valid @adev pointer.
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*/
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bool acpi_device_is_first_physical_node(struct acpi_device *adev,
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const struct device *dev)
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{
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return !!acpi_primary_dev_companion(adev, dev);
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}
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/*
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* acpi_companion_match() - Can we match via ACPI companion device
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* @dev: Device in question
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@ -506,7 +543,6 @@ static void acpi_device_remove_notify_handler(struct acpi_device *device)
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struct acpi_device *acpi_companion_match(const struct device *dev)
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{
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struct acpi_device *adev;
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struct mutex *physical_node_lock;
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adev = ACPI_COMPANION(dev);
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if (!adev)
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@ -515,21 +551,7 @@ struct acpi_device *acpi_companion_match(const struct device *dev)
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if (list_empty(&adev->pnp.ids))
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return NULL;
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physical_node_lock = &adev->physical_node_lock;
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mutex_lock(physical_node_lock);
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if (list_empty(&adev->physical_node_list)) {
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adev = NULL;
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} else {
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const struct acpi_device_physical_node *node;
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node = list_first_entry(&adev->physical_node_list,
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struct acpi_device_physical_node, node);
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if (node->dev != dev)
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adev = NULL;
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}
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mutex_unlock(physical_node_lock);
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return adev;
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return acpi_primary_dev_companion(adev, dev);
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}
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/**
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@ -1119,6 +1119,14 @@ int acpi_dev_pm_attach(struct device *dev, bool power_on)
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if (dev->pm_domain)
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return -EEXIST;
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/*
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* Only attach the power domain to the first device if the
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* companion is shared by multiple. This is to prevent doing power
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* management twice.
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*/
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if (!acpi_device_is_first_physical_node(adev, dev))
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return -EBUSY;
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acpi_add_pm_notifier(adev, dev, acpi_pm_notify_work_func);
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dev->pm_domain = &acpi_general_pm_domain;
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if (power_on) {
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@ -96,6 +96,8 @@ void acpi_device_add_finalize(struct acpi_device *device);
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void acpi_free_pnp_ids(struct acpi_device_pnp *pnp);
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bool acpi_device_is_present(struct acpi_device *adev);
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bool acpi_device_is_battery(struct acpi_device *adev);
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bool acpi_device_is_first_physical_node(struct acpi_device *adev,
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const struct device *dev);
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/* --------------------------------------------------------------------------
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Device Matching and Notification
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@ -1,8 +1,10 @@
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/*
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* acpi_power.c - ACPI Bus Power Management ($Revision: 39 $)
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* drivers/acpi/power.c - ACPI Power Resources management.
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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* Copyright (C) 2001 - 2015 Intel Corp.
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* Author: Andy Grover <andrew.grover@intel.com>
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* Author: Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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* Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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@ -23,10 +25,11 @@
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* ACPI power-managed devices may be controlled in two ways:
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* 1. via "Device Specific (D-State) Control"
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* 2. via "Power Resource Control".
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* This module is used to manage devices relying on Power Resource Control.
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* The code below deals with ACPI Power Resources control.
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*
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* An ACPI "power resource object" describes a software controllable power
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* plane, clock plane, or other resource used by a power managed device.
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* An ACPI "power resource object" represents a software controllable power
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* plane, clock plane, or other resource depended on by a device.
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*
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* A device may rely on multiple power resources, and a power resource
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* may be shared by multiple devices.
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*/
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@ -115,7 +115,6 @@ int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
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return 0;
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}
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bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
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{
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struct acpi_device_physical_node *pn;
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@ -1252,6 +1252,19 @@ void device_unregister(struct device *dev)
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}
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EXPORT_SYMBOL_GPL(device_unregister);
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static struct device *prev_device(struct klist_iter *i)
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{
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struct klist_node *n = klist_prev(i);
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struct device *dev = NULL;
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struct device_private *p;
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if (n) {
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p = to_device_private_parent(n);
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dev = p->device;
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}
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return dev;
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}
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static struct device *next_device(struct klist_iter *i)
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{
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struct klist_node *n = klist_next(i);
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@ -1340,6 +1353,36 @@ int device_for_each_child(struct device *parent, void *data,
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}
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EXPORT_SYMBOL_GPL(device_for_each_child);
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/**
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* device_for_each_child_reverse - device child iterator in reversed order.
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* @parent: parent struct device.
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* @fn: function to be called for each device.
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* @data: data for the callback.
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*
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* Iterate over @parent's child devices, and call @fn for each,
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* passing it @data.
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*
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* We check the return of @fn each time. If it returns anything
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* other than 0, we break out and return that value.
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*/
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int device_for_each_child_reverse(struct device *parent, void *data,
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int (*fn)(struct device *dev, void *data))
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{
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struct klist_iter i;
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struct device *child;
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int error = 0;
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if (!parent->p)
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return 0;
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klist_iter_init(&parent->p->klist_children, &i);
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while ((child = prev_device(&i)) && !error)
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error = fn(child, data);
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klist_iter_exit(&i);
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return error;
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}
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EXPORT_SYMBOL_GPL(device_for_each_child_reverse);
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/**
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* device_find_child - device iterator for locating a particular device.
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* @parent: parent struct device
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@ -399,6 +399,8 @@ EXPORT_SYMBOL_GPL(wait_for_device_probe);
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*
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* This function must be called with @dev lock held. When called for a
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* USB interface, @dev->parent lock must be held as well.
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*
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* If the device has a parent, runtime-resume the parent before driver probing.
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*/
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int driver_probe_device(struct device_driver *drv, struct device *dev)
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{
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@ -410,10 +412,16 @@ int driver_probe_device(struct device_driver *drv, struct device *dev)
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pr_debug("bus: '%s': %s: matched device %s with driver %s\n",
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drv->bus->name, __func__, dev_name(dev), drv->name);
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if (dev->parent)
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pm_runtime_get_sync(dev->parent);
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pm_runtime_barrier(dev);
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ret = really_probe(dev, drv);
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pm_request_idle(dev);
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if (dev->parent)
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pm_runtime_put(dev->parent);
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return ret;
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}
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@ -507,11 +515,17 @@ static void __device_attach_async_helper(void *_dev, async_cookie_t cookie)
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device_lock(dev);
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if (dev->parent)
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pm_runtime_get_sync(dev->parent);
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bus_for_each_drv(dev->bus, NULL, &data, __device_attach_driver);
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dev_dbg(dev, "async probe completed\n");
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pm_request_idle(dev);
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if (dev->parent)
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pm_runtime_put(dev->parent);
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device_unlock(dev);
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put_device(dev);
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@ -541,6 +555,9 @@ static int __device_attach(struct device *dev, bool allow_async)
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.want_async = false,
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};
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if (dev->parent)
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pm_runtime_get_sync(dev->parent);
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ret = bus_for_each_drv(dev->bus, NULL, &data,
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__device_attach_driver);
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if (!ret && allow_async && data.have_async) {
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@ -557,6 +574,9 @@ static int __device_attach(struct device *dev, bool allow_async)
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} else {
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pm_request_idle(dev);
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}
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if (dev->parent)
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pm_runtime_put(dev->parent);
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}
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out_unlock:
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device_unlock(dev);
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@ -73,6 +73,8 @@ extern int pm_qos_sysfs_add_resume_latency(struct device *dev);
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extern void pm_qos_sysfs_remove_resume_latency(struct device *dev);
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extern int pm_qos_sysfs_add_flags(struct device *dev);
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extern void pm_qos_sysfs_remove_flags(struct device *dev);
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extern int pm_qos_sysfs_add_latency_tolerance(struct device *dev);
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extern void pm_qos_sysfs_remove_latency_tolerance(struct device *dev);
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#else /* CONFIG_PM */
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|
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@ -883,3 +883,40 @@ int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val)
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mutex_unlock(&dev_pm_qos_mtx);
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return ret;
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}
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/**
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* dev_pm_qos_expose_latency_tolerance - Expose latency tolerance to userspace
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* @dev: Device whose latency tolerance to expose
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*/
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int dev_pm_qos_expose_latency_tolerance(struct device *dev)
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{
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int ret;
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if (!dev->power.set_latency_tolerance)
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return -EINVAL;
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mutex_lock(&dev_pm_qos_sysfs_mtx);
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ret = pm_qos_sysfs_add_latency_tolerance(dev);
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mutex_unlock(&dev_pm_qos_sysfs_mtx);
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return ret;
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}
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EXPORT_SYMBOL_GPL(dev_pm_qos_expose_latency_tolerance);
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/**
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* dev_pm_qos_hide_latency_tolerance - Hide latency tolerance from userspace
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* @dev: Device whose latency tolerance to hide
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*/
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void dev_pm_qos_hide_latency_tolerance(struct device *dev)
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{
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mutex_lock(&dev_pm_qos_sysfs_mtx);
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pm_qos_sysfs_remove_latency_tolerance(dev);
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mutex_unlock(&dev_pm_qos_sysfs_mtx);
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/* Remove the request from user space now */
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pm_runtime_get_sync(dev);
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dev_pm_qos_update_user_latency_tolerance(dev,
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PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT);
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pm_runtime_put(dev);
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}
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EXPORT_SYMBOL_GPL(dev_pm_qos_hide_latency_tolerance);
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|
|
|
|||
|
|
@ -738,6 +738,17 @@ void pm_qos_sysfs_remove_flags(struct device *dev)
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sysfs_unmerge_group(&dev->kobj, &pm_qos_flags_attr_group);
|
||||
}
|
||||
|
||||
int pm_qos_sysfs_add_latency_tolerance(struct device *dev)
|
||||
{
|
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return sysfs_merge_group(&dev->kobj,
|
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&pm_qos_latency_tolerance_attr_group);
|
||||
}
|
||||
|
||||
void pm_qos_sysfs_remove_latency_tolerance(struct device *dev)
|
||||
{
|
||||
sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
|
||||
}
|
||||
|
||||
void rpm_sysfs_remove(struct device *dev)
|
||||
{
|
||||
sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
|
||||
|
|
|
|||
|
|
@ -85,6 +85,14 @@ config INTEL_IOP_ADMA
|
|||
help
|
||||
Enable support for the Intel(R) IOP Series RAID engines.
|
||||
|
||||
config IDMA64
|
||||
tristate "Intel integrated DMA 64-bit support"
|
||||
select DMA_ENGINE
|
||||
select DMA_VIRTUAL_CHANNELS
|
||||
help
|
||||
Enable DMA support for Intel Low Power Subsystem such as found on
|
||||
Intel Skylake PCH.
|
||||
|
||||
source "drivers/dma/dw/Kconfig"
|
||||
|
||||
config AT_HDMAC
|
||||
|
|
|
|||
|
|
@ -14,6 +14,7 @@ obj-$(CONFIG_HSU_DMA) += hsu/
|
|||
obj-$(CONFIG_MPC512X_DMA) += mpc512x_dma.o
|
||||
obj-$(CONFIG_PPC_BESTCOMM) += bestcomm/
|
||||
obj-$(CONFIG_MV_XOR) += mv_xor.o
|
||||
obj-$(CONFIG_IDMA64) += idma64.o
|
||||
obj-$(CONFIG_DW_DMAC_CORE) += dw/
|
||||
obj-$(CONFIG_AT_HDMAC) += at_hdmac.o
|
||||
obj-$(CONFIG_AT_XDMAC) += at_xdmac.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,710 @@
|
|||
/*
|
||||
* Core driver for the Intel integrated DMA 64-bit
|
||||
*
|
||||
* Copyright (C) 2015 Intel Corporation
|
||||
* Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#include <linux/bitops.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/dmaengine.h>
|
||||
#include <linux/dma-mapping.h>
|
||||
#include <linux/dmapool.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/slab.h>
|
||||
|
||||
#include "idma64.h"
|
||||
|
||||
/* Platform driver name */
|
||||
#define DRV_NAME "idma64"
|
||||
|
||||
/* For now we support only two channels */
|
||||
#define IDMA64_NR_CHAN 2
|
||||
|
||||
/* ---------------------------------------------------------------------- */
|
||||
|
||||
static struct device *chan2dev(struct dma_chan *chan)
|
||||
{
|
||||
return &chan->dev->device;
|
||||
}
|
||||
|
||||
/* ---------------------------------------------------------------------- */
|
||||
|
||||
static void idma64_off(struct idma64 *idma64)
|
||||
{
|
||||
unsigned short count = 100;
|
||||
|
||||
dma_writel(idma64, CFG, 0);
|
||||
|
||||
channel_clear_bit(idma64, MASK(XFER), idma64->all_chan_mask);
|
||||
channel_clear_bit(idma64, MASK(BLOCK), idma64->all_chan_mask);
|
||||
channel_clear_bit(idma64, MASK(SRC_TRAN), idma64->all_chan_mask);
|
||||
channel_clear_bit(idma64, MASK(DST_TRAN), idma64->all_chan_mask);
|
||||
channel_clear_bit(idma64, MASK(ERROR), idma64->all_chan_mask);
|
||||
|
||||
do {
|
||||
cpu_relax();
|
||||
} while (dma_readl(idma64, CFG) & IDMA64_CFG_DMA_EN && --count);
|
||||
}
|
||||
|
||||
static void idma64_on(struct idma64 *idma64)
|
||||
{
|
||||
dma_writel(idma64, CFG, IDMA64_CFG_DMA_EN);
|
||||
}
|
||||
|
||||
/* ---------------------------------------------------------------------- */
|
||||
|
||||
static void idma64_chan_init(struct idma64 *idma64, struct idma64_chan *idma64c)
|
||||
{
|
||||
u32 cfghi = IDMA64C_CFGH_SRC_PER(1) | IDMA64C_CFGH_DST_PER(0);
|
||||
u32 cfglo = 0;
|
||||
|
||||
/* Enforce FIFO drain when channel is suspended */
|
||||
cfglo |= IDMA64C_CFGL_CH_DRAIN;
|
||||
|
||||
/* Set default burst alignment */
|
||||
cfglo |= IDMA64C_CFGL_DST_BURST_ALIGN | IDMA64C_CFGL_SRC_BURST_ALIGN;
|
||||
|
||||
channel_writel(idma64c, CFG_LO, cfglo);
|
||||
channel_writel(idma64c, CFG_HI, cfghi);
|
||||
|
||||
/* Enable interrupts */
|
||||
channel_set_bit(idma64, MASK(XFER), idma64c->mask);
|
||||
channel_set_bit(idma64, MASK(ERROR), idma64c->mask);
|
||||
|
||||
/*
|
||||
* Enforce the controller to be turned on.
|
||||
*
|
||||
* The iDMA is turned off in ->probe() and looses context during system
|
||||
* suspend / resume cycle. That's why we have to enable it each time we
|
||||
* use it.
|
||||
*/
|
||||
idma64_on(idma64);
|
||||
}
|
||||
|
||||
static void idma64_chan_stop(struct idma64 *idma64, struct idma64_chan *idma64c)
|
||||
{
|
||||
channel_clear_bit(idma64, CH_EN, idma64c->mask);
|
||||
}
|
||||
|
||||
static void idma64_chan_start(struct idma64 *idma64, struct idma64_chan *idma64c)
|
||||
{
|
||||
struct idma64_desc *desc = idma64c->desc;
|
||||
struct idma64_hw_desc *hw = &desc->hw[0];
|
||||
|
||||
channel_writeq(idma64c, SAR, 0);
|
||||
channel_writeq(idma64c, DAR, 0);
|
||||
|
||||
channel_writel(idma64c, CTL_HI, IDMA64C_CTLH_BLOCK_TS(~0UL));
|
||||
channel_writel(idma64c, CTL_LO, IDMA64C_CTLL_LLP_S_EN | IDMA64C_CTLL_LLP_D_EN);
|
||||
|
||||
channel_writeq(idma64c, LLP, hw->llp);
|
||||
|
||||
channel_set_bit(idma64, CH_EN, idma64c->mask);
|
||||
}
|
||||
|
||||
static void idma64_stop_transfer(struct idma64_chan *idma64c)
|
||||
{
|
||||
struct idma64 *idma64 = to_idma64(idma64c->vchan.chan.device);
|
||||
|
||||
idma64_chan_stop(idma64, idma64c);
|
||||
}
|
||||
|
||||
static void idma64_start_transfer(struct idma64_chan *idma64c)
|
||||
{
|
||||
struct idma64 *idma64 = to_idma64(idma64c->vchan.chan.device);
|
||||
struct virt_dma_desc *vdesc;
|
||||
|
||||
/* Get the next descriptor */
|
||||
vdesc = vchan_next_desc(&idma64c->vchan);
|
||||
if (!vdesc) {
|
||||
idma64c->desc = NULL;
|
||||
return;
|
||||
}
|
||||
|
||||
list_del(&vdesc->node);
|
||||
idma64c->desc = to_idma64_desc(vdesc);
|
||||
|
||||
/* Configure the channel */
|
||||
idma64_chan_init(idma64, idma64c);
|
||||
|
||||
/* Start the channel with a new descriptor */
|
||||
idma64_chan_start(idma64, idma64c);
|
||||
}
|
||||
|
||||
/* ---------------------------------------------------------------------- */
|
||||
|
||||
static void idma64_chan_irq(struct idma64 *idma64, unsigned short c,
|
||||
u32 status_err, u32 status_xfer)
|
||||
{
|
||||
struct idma64_chan *idma64c = &idma64->chan[c];
|
||||
struct idma64_desc *desc;
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&idma64c->vchan.lock, flags);
|
||||
desc = idma64c->desc;
|
||||
if (desc) {
|
||||
if (status_err & (1 << c)) {
|
||||
dma_writel(idma64, CLEAR(ERROR), idma64c->mask);
|
||||
desc->status = DMA_ERROR;
|
||||
} else if (status_xfer & (1 << c)) {
|
||||
dma_writel(idma64, CLEAR(XFER), idma64c->mask);
|
||||
desc->status = DMA_COMPLETE;
|
||||
vchan_cookie_complete(&desc->vdesc);
|
||||
idma64_start_transfer(idma64c);
|
||||
}
|
||||
|
||||
/* idma64_start_transfer() updates idma64c->desc */
|
||||
if (idma64c->desc == NULL || desc->status == DMA_ERROR)
|
||||
idma64_stop_transfer(idma64c);
|
||||
}
|
||||
spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
|
||||
}
|
||||
|
||||
static irqreturn_t idma64_irq(int irq, void *dev)
|
||||
{
|
||||
struct idma64 *idma64 = dev;
|
||||
u32 status = dma_readl(idma64, STATUS_INT);
|
||||
u32 status_xfer;
|
||||
u32 status_err;
|
||||
unsigned short i;
|
||||
|
||||
dev_vdbg(idma64->dma.dev, "%s: status=%#x\n", __func__, status);
|
||||
|
||||
/* Check if we have any interrupt from the DMA controller */
|
||||
if (!status)
|
||||
return IRQ_NONE;
|
||||
|
||||
/* Disable interrupts */
|
||||
channel_clear_bit(idma64, MASK(XFER), idma64->all_chan_mask);
|
||||
channel_clear_bit(idma64, MASK(ERROR), idma64->all_chan_mask);
|
||||
|
||||
status_xfer = dma_readl(idma64, RAW(XFER));
|
||||
status_err = dma_readl(idma64, RAW(ERROR));
|
||||
|
||||
for (i = 0; i < idma64->dma.chancnt; i++)
|
||||
idma64_chan_irq(idma64, i, status_err, status_xfer);
|
||||
|
||||
/* Re-enable interrupts */
|
||||
channel_set_bit(idma64, MASK(XFER), idma64->all_chan_mask);
|
||||
channel_set_bit(idma64, MASK(ERROR), idma64->all_chan_mask);
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
/* ---------------------------------------------------------------------- */
|
||||
|
||||
static struct idma64_desc *idma64_alloc_desc(unsigned int ndesc)
|
||||
{
|
||||
struct idma64_desc *desc;
|
||||
|
||||
desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
|
||||
if (!desc)
|
||||
return NULL;
|
||||
|
||||
desc->hw = kcalloc(ndesc, sizeof(*desc->hw), GFP_NOWAIT);
|
||||
if (!desc->hw) {
|
||||
kfree(desc);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return desc;
|
||||
}
|
||||
|
||||
static void idma64_desc_free(struct idma64_chan *idma64c,
|
||||
struct idma64_desc *desc)
|
||||
{
|
||||
struct idma64_hw_desc *hw;
|
||||
|
||||
if (desc->ndesc) {
|
||||
unsigned int i = desc->ndesc;
|
||||
|
||||
do {
|
||||
hw = &desc->hw[--i];
|
||||
dma_pool_free(idma64c->pool, hw->lli, hw->llp);
|
||||
} while (i);
|
||||
}
|
||||
|
||||
kfree(desc->hw);
|
||||
kfree(desc);
|
||||
}
|
||||
|
||||
static void idma64_vdesc_free(struct virt_dma_desc *vdesc)
|
||||
{
|
||||
struct idma64_chan *idma64c = to_idma64_chan(vdesc->tx.chan);
|
||||
|
||||
idma64_desc_free(idma64c, to_idma64_desc(vdesc));
|
||||
}
|
||||
|
||||
static u64 idma64_hw_desc_fill(struct idma64_hw_desc *hw,
|
||||
struct dma_slave_config *config,
|
||||
enum dma_transfer_direction direction, u64 llp)
|
||||
{
|
||||
struct idma64_lli *lli = hw->lli;
|
||||
u64 sar, dar;
|
||||
u32 ctlhi = IDMA64C_CTLH_BLOCK_TS(hw->len);
|
||||
u32 ctllo = IDMA64C_CTLL_LLP_S_EN | IDMA64C_CTLL_LLP_D_EN;
|
||||
u32 src_width, dst_width;
|
||||
|
||||
if (direction == DMA_MEM_TO_DEV) {
|
||||
sar = hw->phys;
|
||||
dar = config->dst_addr;
|
||||
ctllo |= IDMA64C_CTLL_DST_FIX | IDMA64C_CTLL_SRC_INC |
|
||||
IDMA64C_CTLL_FC_M2P;
|
||||
src_width = min_t(u32, 2, __fls(sar | hw->len));
|
||||
dst_width = __fls(config->dst_addr_width);
|
||||
} else { /* DMA_DEV_TO_MEM */
|
||||
sar = config->src_addr;
|
||||
dar = hw->phys;
|
||||
ctllo |= IDMA64C_CTLL_DST_INC | IDMA64C_CTLL_SRC_FIX |
|
||||
IDMA64C_CTLL_FC_P2M;
|
||||
src_width = __fls(config->src_addr_width);
|
||||
dst_width = min_t(u32, 2, __fls(dar | hw->len));
|
||||
}
|
||||
|
||||
lli->sar = sar;
|
||||
lli->dar = dar;
|
||||
|
||||
lli->ctlhi = ctlhi;
|
||||
lli->ctllo = ctllo |
|
||||
IDMA64C_CTLL_SRC_MSIZE(config->src_maxburst) |
|
||||
IDMA64C_CTLL_DST_MSIZE(config->dst_maxburst) |
|
||||
IDMA64C_CTLL_DST_WIDTH(dst_width) |
|
||||
IDMA64C_CTLL_SRC_WIDTH(src_width);
|
||||
|
||||
lli->llp = llp;
|
||||
return hw->llp;
|
||||
}
|
||||
|
||||
static void idma64_desc_fill(struct idma64_chan *idma64c,
|
||||
struct idma64_desc *desc)
|
||||
{
|
||||
struct dma_slave_config *config = &idma64c->config;
|
||||
struct idma64_hw_desc *hw = &desc->hw[desc->ndesc - 1];
|
||||
struct idma64_lli *lli = hw->lli;
|
||||
u64 llp = 0;
|
||||
unsigned int i = desc->ndesc;
|
||||
|
||||
/* Fill the hardware descriptors and link them to a list */
|
||||
do {
|
||||
hw = &desc->hw[--i];
|
||||
llp = idma64_hw_desc_fill(hw, config, desc->direction, llp);
|
||||
desc->length += hw->len;
|
||||
} while (i);
|
||||
|
||||
/* Trigger interrupt after last block */
|
||||
lli->ctllo |= IDMA64C_CTLL_INT_EN;
|
||||
}
|
||||
|
||||
static struct dma_async_tx_descriptor *idma64_prep_slave_sg(
|
||||
struct dma_chan *chan, struct scatterlist *sgl,
|
||||
unsigned int sg_len, enum dma_transfer_direction direction,
|
||||
unsigned long flags, void *context)
|
||||
{
|
||||
struct idma64_chan *idma64c = to_idma64_chan(chan);
|
||||
struct idma64_desc *desc;
|
||||
struct scatterlist *sg;
|
||||
unsigned int i;
|
||||
|
||||
desc = idma64_alloc_desc(sg_len);
|
||||
if (!desc)
|
||||
return NULL;
|
||||
|
||||
for_each_sg(sgl, sg, sg_len, i) {
|
||||
struct idma64_hw_desc *hw = &desc->hw[i];
|
||||
|
||||
/* Allocate DMA capable memory for hardware descriptor */
|
||||
hw->lli = dma_pool_alloc(idma64c->pool, GFP_NOWAIT, &hw->llp);
|
||||
if (!hw->lli) {
|
||||
desc->ndesc = i;
|
||||
idma64_desc_free(idma64c, desc);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
hw->phys = sg_dma_address(sg);
|
||||
hw->len = sg_dma_len(sg);
|
||||
}
|
||||
|
||||
desc->ndesc = sg_len;
|
||||
desc->direction = direction;
|
||||
desc->status = DMA_IN_PROGRESS;
|
||||
|
||||
idma64_desc_fill(idma64c, desc);
|
||||
return vchan_tx_prep(&idma64c->vchan, &desc->vdesc, flags);
|
||||
}
|
||||
|
||||
static void idma64_issue_pending(struct dma_chan *chan)
|
||||
{
|
||||
struct idma64_chan *idma64c = to_idma64_chan(chan);
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&idma64c->vchan.lock, flags);
|
||||
if (vchan_issue_pending(&idma64c->vchan) && !idma64c->desc)
|
||||
idma64_start_transfer(idma64c);
|
||||
spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
|
||||
}
|
||||
|
||||
static size_t idma64_active_desc_size(struct idma64_chan *idma64c)
|
||||
{
|
||||
struct idma64_desc *desc = idma64c->desc;
|
||||
struct idma64_hw_desc *hw;
|
||||
size_t bytes = desc->length;
|
||||
u64 llp;
|
||||
u32 ctlhi;
|
||||
unsigned int i = 0;
|
||||
|
||||
llp = channel_readq(idma64c, LLP);
|
||||
do {
|
||||
hw = &desc->hw[i];
|
||||
} while ((hw->llp != llp) && (++i < desc->ndesc));
|
||||
|
||||
if (!i)
|
||||
return bytes;
|
||||
|
||||
do {
|
||||
bytes -= desc->hw[--i].len;
|
||||
} while (i);
|
||||
|
||||
ctlhi = channel_readl(idma64c, CTL_HI);
|
||||
return bytes - IDMA64C_CTLH_BLOCK_TS(ctlhi);
|
||||
}
|
||||
|
||||
static enum dma_status idma64_tx_status(struct dma_chan *chan,
|
||||
dma_cookie_t cookie, struct dma_tx_state *state)
|
||||
{
|
||||
struct idma64_chan *idma64c = to_idma64_chan(chan);
|
||||
struct virt_dma_desc *vdesc;
|
||||
enum dma_status status;
|
||||
size_t bytes;
|
||||
unsigned long flags;
|
||||
|
||||
status = dma_cookie_status(chan, cookie, state);
|
||||
if (status == DMA_COMPLETE)
|
||||
return status;
|
||||
|
||||
spin_lock_irqsave(&idma64c->vchan.lock, flags);
|
||||
vdesc = vchan_find_desc(&idma64c->vchan, cookie);
|
||||
if (idma64c->desc && cookie == idma64c->desc->vdesc.tx.cookie) {
|
||||
bytes = idma64_active_desc_size(idma64c);
|
||||
dma_set_residue(state, bytes);
|
||||
status = idma64c->desc->status;
|
||||
} else if (vdesc) {
|
||||
bytes = to_idma64_desc(vdesc)->length;
|
||||
dma_set_residue(state, bytes);
|
||||
}
|
||||
spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
static void convert_burst(u32 *maxburst)
|
||||
{
|
||||
if (*maxburst)
|
||||
*maxburst = __fls(*maxburst);
|
||||
else
|
||||
*maxburst = 0;
|
||||
}
|
||||
|
||||
static int idma64_slave_config(struct dma_chan *chan,
|
||||
struct dma_slave_config *config)
|
||||
{
|
||||
struct idma64_chan *idma64c = to_idma64_chan(chan);
|
||||
|
||||
/* Check if chan will be configured for slave transfers */
|
||||
if (!is_slave_direction(config->direction))
|
||||
return -EINVAL;
|
||||
|
||||
memcpy(&idma64c->config, config, sizeof(idma64c->config));
|
||||
|
||||
convert_burst(&idma64c->config.src_maxburst);
|
||||
convert_burst(&idma64c->config.dst_maxburst);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void idma64_chan_deactivate(struct idma64_chan *idma64c)
|
||||
{
|
||||
unsigned short count = 100;
|
||||
u32 cfglo;
|
||||
|
||||
cfglo = channel_readl(idma64c, CFG_LO);
|
||||
channel_writel(idma64c, CFG_LO, cfglo | IDMA64C_CFGL_CH_SUSP);
|
||||
do {
|
||||
udelay(1);
|
||||
cfglo = channel_readl(idma64c, CFG_LO);
|
||||
} while (!(cfglo & IDMA64C_CFGL_FIFO_EMPTY) && --count);
|
||||
}
|
||||
|
||||
static void idma64_chan_activate(struct idma64_chan *idma64c)
|
||||
{
|
||||
u32 cfglo;
|
||||
|
||||
cfglo = channel_readl(idma64c, CFG_LO);
|
||||
channel_writel(idma64c, CFG_LO, cfglo & ~IDMA64C_CFGL_CH_SUSP);
|
||||
}
|
||||
|
||||
static int idma64_pause(struct dma_chan *chan)
|
||||
{
|
||||
struct idma64_chan *idma64c = to_idma64_chan(chan);
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&idma64c->vchan.lock, flags);
|
||||
if (idma64c->desc && idma64c->desc->status == DMA_IN_PROGRESS) {
|
||||
idma64_chan_deactivate(idma64c);
|
||||
idma64c->desc->status = DMA_PAUSED;
|
||||
}
|
||||
spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int idma64_resume(struct dma_chan *chan)
|
||||
{
|
||||
struct idma64_chan *idma64c = to_idma64_chan(chan);
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&idma64c->vchan.lock, flags);
|
||||
if (idma64c->desc && idma64c->desc->status == DMA_PAUSED) {
|
||||
idma64c->desc->status = DMA_IN_PROGRESS;
|
||||
idma64_chan_activate(idma64c);
|
||||
}
|
||||
spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int idma64_terminate_all(struct dma_chan *chan)
|
||||
{
|
||||
struct idma64_chan *idma64c = to_idma64_chan(chan);
|
||||
unsigned long flags;
|
||||
LIST_HEAD(head);
|
||||
|
||||
spin_lock_irqsave(&idma64c->vchan.lock, flags);
|
||||
idma64_chan_deactivate(idma64c);
|
||||
idma64_stop_transfer(idma64c);
|
||||
if (idma64c->desc) {
|
||||
idma64_vdesc_free(&idma64c->desc->vdesc);
|
||||
idma64c->desc = NULL;
|
||||
}
|
||||
vchan_get_all_descriptors(&idma64c->vchan, &head);
|
||||
spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
|
||||
|
||||
vchan_dma_desc_free_list(&idma64c->vchan, &head);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int idma64_alloc_chan_resources(struct dma_chan *chan)
|
||||
{
|
||||
struct idma64_chan *idma64c = to_idma64_chan(chan);
|
||||
|
||||
/* Create a pool of consistent memory blocks for hardware descriptors */
|
||||
idma64c->pool = dma_pool_create(dev_name(chan2dev(chan)),
|
||||
chan->device->dev,
|
||||
sizeof(struct idma64_lli), 8, 0);
|
||||
if (!idma64c->pool) {
|
||||
dev_err(chan2dev(chan), "No memory for descriptors\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void idma64_free_chan_resources(struct dma_chan *chan)
|
||||
{
|
||||
struct idma64_chan *idma64c = to_idma64_chan(chan);
|
||||
|
||||
vchan_free_chan_resources(to_virt_chan(chan));
|
||||
dma_pool_destroy(idma64c->pool);
|
||||
idma64c->pool = NULL;
|
||||
}
|
||||
|
||||
/* ---------------------------------------------------------------------- */
|
||||
|
||||
#define IDMA64_BUSWIDTHS \
|
||||
BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
|
||||
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
|
||||
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES)
|
||||
|
||||
static int idma64_probe(struct idma64_chip *chip)
|
||||
{
|
||||
struct idma64 *idma64;
|
||||
unsigned short nr_chan = IDMA64_NR_CHAN;
|
||||
unsigned short i;
|
||||
int ret;
|
||||
|
||||
idma64 = devm_kzalloc(chip->dev, sizeof(*idma64), GFP_KERNEL);
|
||||
if (!idma64)
|
||||
return -ENOMEM;
|
||||
|
||||
idma64->regs = chip->regs;
|
||||
chip->idma64 = idma64;
|
||||
|
||||
idma64->chan = devm_kcalloc(chip->dev, nr_chan, sizeof(*idma64->chan),
|
||||
GFP_KERNEL);
|
||||
if (!idma64->chan)
|
||||
return -ENOMEM;
|
||||
|
||||
idma64->all_chan_mask = (1 << nr_chan) - 1;
|
||||
|
||||
/* Turn off iDMA controller */
|
||||
idma64_off(idma64);
|
||||
|
||||
ret = devm_request_irq(chip->dev, chip->irq, idma64_irq, IRQF_SHARED,
|
||||
dev_name(chip->dev), idma64);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
INIT_LIST_HEAD(&idma64->dma.channels);
|
||||
for (i = 0; i < nr_chan; i++) {
|
||||
struct idma64_chan *idma64c = &idma64->chan[i];
|
||||
|
||||
idma64c->vchan.desc_free = idma64_vdesc_free;
|
||||
vchan_init(&idma64c->vchan, &idma64->dma);
|
||||
|
||||
idma64c->regs = idma64->regs + i * IDMA64_CH_LENGTH;
|
||||
idma64c->mask = BIT(i);
|
||||
}
|
||||
|
||||
dma_cap_set(DMA_SLAVE, idma64->dma.cap_mask);
|
||||
dma_cap_set(DMA_PRIVATE, idma64->dma.cap_mask);
|
||||
|
||||
idma64->dma.device_alloc_chan_resources = idma64_alloc_chan_resources;
|
||||
idma64->dma.device_free_chan_resources = idma64_free_chan_resources;
|
||||
|
||||
idma64->dma.device_prep_slave_sg = idma64_prep_slave_sg;
|
||||
|
||||
idma64->dma.device_issue_pending = idma64_issue_pending;
|
||||
idma64->dma.device_tx_status = idma64_tx_status;
|
||||
|
||||
idma64->dma.device_config = idma64_slave_config;
|
||||
idma64->dma.device_pause = idma64_pause;
|
||||
idma64->dma.device_resume = idma64_resume;
|
||||
idma64->dma.device_terminate_all = idma64_terminate_all;
|
||||
|
||||
idma64->dma.src_addr_widths = IDMA64_BUSWIDTHS;
|
||||
idma64->dma.dst_addr_widths = IDMA64_BUSWIDTHS;
|
||||
idma64->dma.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
|
||||
idma64->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
|
||||
|
||||
idma64->dma.dev = chip->dev;
|
||||
|
||||
ret = dma_async_device_register(&idma64->dma);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
dev_info(chip->dev, "Found Intel integrated DMA 64-bit\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int idma64_remove(struct idma64_chip *chip)
|
||||
{
|
||||
struct idma64 *idma64 = chip->idma64;
|
||||
unsigned short i;
|
||||
|
||||
dma_async_device_unregister(&idma64->dma);
|
||||
|
||||
/*
|
||||
* Explicitly call devm_request_irq() to avoid the side effects with
|
||||
* the scheduled tasklets.
|
||||
*/
|
||||
devm_free_irq(chip->dev, chip->irq, idma64);
|
||||
|
||||
for (i = 0; i < idma64->dma.chancnt; i++) {
|
||||
struct idma64_chan *idma64c = &idma64->chan[i];
|
||||
|
||||
tasklet_kill(&idma64c->vchan.task);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* ---------------------------------------------------------------------- */
|
||||
|
||||
static int idma64_platform_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct idma64_chip *chip;
|
||||
struct device *dev = &pdev->dev;
|
||||
struct resource *mem;
|
||||
int ret;
|
||||
|
||||
chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
|
||||
if (!chip)
|
||||
return -ENOMEM;
|
||||
|
||||
chip->irq = platform_get_irq(pdev, 0);
|
||||
if (chip->irq < 0)
|
||||
return chip->irq;
|
||||
|
||||
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
chip->regs = devm_ioremap_resource(dev, mem);
|
||||
if (IS_ERR(chip->regs))
|
||||
return PTR_ERR(chip->regs);
|
||||
|
||||
ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
chip->dev = dev;
|
||||
|
||||
ret = idma64_probe(chip);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
platform_set_drvdata(pdev, chip);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int idma64_platform_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct idma64_chip *chip = platform_get_drvdata(pdev);
|
||||
|
||||
return idma64_remove(chip);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM_SLEEP
|
||||
|
||||
static int idma64_pm_suspend(struct device *dev)
|
||||
{
|
||||
struct platform_device *pdev = to_platform_device(dev);
|
||||
struct idma64_chip *chip = platform_get_drvdata(pdev);
|
||||
|
||||
idma64_off(chip->idma64);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int idma64_pm_resume(struct device *dev)
|
||||
{
|
||||
struct platform_device *pdev = to_platform_device(dev);
|
||||
struct idma64_chip *chip = platform_get_drvdata(pdev);
|
||||
|
||||
idma64_on(chip->idma64);
|
||||
return 0;
|
||||
}
|
||||
|
||||
#endif /* CONFIG_PM_SLEEP */
|
||||
|
||||
static const struct dev_pm_ops idma64_dev_pm_ops = {
|
||||
SET_SYSTEM_SLEEP_PM_OPS(idma64_pm_suspend, idma64_pm_resume)
|
||||
};
|
||||
|
||||
static struct platform_driver idma64_platform_driver = {
|
||||
.probe = idma64_platform_probe,
|
||||
.remove = idma64_platform_remove,
|
||||
.driver = {
|
||||
.name = DRV_NAME,
|
||||
.pm = &idma64_dev_pm_ops,
|
||||
},
|
||||
};
|
||||
|
||||
module_platform_driver(idma64_platform_driver);
|
||||
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_DESCRIPTION("iDMA64 core driver");
|
||||
MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
|
||||
MODULE_ALIAS("platform:" DRV_NAME);
|
||||
|
|
@ -0,0 +1,233 @@
|
|||
/*
|
||||
* Driver for the Intel integrated DMA 64-bit
|
||||
*
|
||||
* Copyright (C) 2015 Intel Corporation
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#ifndef __DMA_IDMA64_H__
|
||||
#define __DMA_IDMA64_H__
|
||||
|
||||
#include <linux/device.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/spinlock.h>
|
||||
#include <linux/types.h>
|
||||
|
||||
#include "virt-dma.h"
|
||||
|
||||
/* Channel registers */
|
||||
|
||||
#define IDMA64_CH_SAR 0x00 /* Source Address Register */
|
||||
#define IDMA64_CH_DAR 0x08 /* Destination Address Register */
|
||||
#define IDMA64_CH_LLP 0x10 /* Linked List Pointer */
|
||||
#define IDMA64_CH_CTL_LO 0x18 /* Control Register Low */
|
||||
#define IDMA64_CH_CTL_HI 0x1c /* Control Register High */
|
||||
#define IDMA64_CH_SSTAT 0x20
|
||||
#define IDMA64_CH_DSTAT 0x28
|
||||
#define IDMA64_CH_SSTATAR 0x30
|
||||
#define IDMA64_CH_DSTATAR 0x38
|
||||
#define IDMA64_CH_CFG_LO 0x40 /* Configuration Register Low */
|
||||
#define IDMA64_CH_CFG_HI 0x44 /* Configuration Register High */
|
||||
#define IDMA64_CH_SGR 0x48
|
||||
#define IDMA64_CH_DSR 0x50
|
||||
|
||||
#define IDMA64_CH_LENGTH 0x58
|
||||
|
||||
/* Bitfields in CTL_LO */
|
||||
#define IDMA64C_CTLL_INT_EN (1 << 0) /* irqs enabled? */
|
||||
#define IDMA64C_CTLL_DST_WIDTH(x) ((x) << 1) /* bytes per element */
|
||||
#define IDMA64C_CTLL_SRC_WIDTH(x) ((x) << 4)
|
||||
#define IDMA64C_CTLL_DST_INC (0 << 8) /* DAR update/not */
|
||||
#define IDMA64C_CTLL_DST_FIX (1 << 8)
|
||||
#define IDMA64C_CTLL_SRC_INC (0 << 10) /* SAR update/not */
|
||||
#define IDMA64C_CTLL_SRC_FIX (1 << 10)
|
||||
#define IDMA64C_CTLL_DST_MSIZE(x) ((x) << 11) /* burst, #elements */
|
||||
#define IDMA64C_CTLL_SRC_MSIZE(x) ((x) << 14)
|
||||
#define IDMA64C_CTLL_FC_M2P (1 << 20) /* mem-to-periph */
|
||||
#define IDMA64C_CTLL_FC_P2M (2 << 20) /* periph-to-mem */
|
||||
#define IDMA64C_CTLL_LLP_D_EN (1 << 27) /* dest block chain */
|
||||
#define IDMA64C_CTLL_LLP_S_EN (1 << 28) /* src block chain */
|
||||
|
||||
/* Bitfields in CTL_HI */
|
||||
#define IDMA64C_CTLH_BLOCK_TS(x) ((x) & ((1 << 17) - 1))
|
||||
#define IDMA64C_CTLH_DONE (1 << 17)
|
||||
|
||||
/* Bitfields in CFG_LO */
|
||||
#define IDMA64C_CFGL_DST_BURST_ALIGN (1 << 0) /* dst burst align */
|
||||
#define IDMA64C_CFGL_SRC_BURST_ALIGN (1 << 1) /* src burst align */
|
||||
#define IDMA64C_CFGL_CH_SUSP (1 << 8)
|
||||
#define IDMA64C_CFGL_FIFO_EMPTY (1 << 9)
|
||||
#define IDMA64C_CFGL_CH_DRAIN (1 << 10) /* drain FIFO */
|
||||
#define IDMA64C_CFGL_DST_OPT_BL (1 << 20) /* optimize dst burst length */
|
||||
#define IDMA64C_CFGL_SRC_OPT_BL (1 << 21) /* optimize src burst length */
|
||||
|
||||
/* Bitfields in CFG_HI */
|
||||
#define IDMA64C_CFGH_SRC_PER(x) ((x) << 0) /* src peripheral */
|
||||
#define IDMA64C_CFGH_DST_PER(x) ((x) << 4) /* dst peripheral */
|
||||
#define IDMA64C_CFGH_RD_ISSUE_THD(x) ((x) << 8)
|
||||
#define IDMA64C_CFGH_RW_ISSUE_THD(x) ((x) << 18)
|
||||
|
||||
/* Interrupt registers */
|
||||
|
||||
#define IDMA64_INT_XFER 0x00
|
||||
#define IDMA64_INT_BLOCK 0x08
|
||||
#define IDMA64_INT_SRC_TRAN 0x10
|
||||
#define IDMA64_INT_DST_TRAN 0x18
|
||||
#define IDMA64_INT_ERROR 0x20
|
||||
|
||||
#define IDMA64_RAW(x) (0x2c0 + IDMA64_INT_##x) /* r */
|
||||
#define IDMA64_STATUS(x) (0x2e8 + IDMA64_INT_##x) /* r (raw & mask) */
|
||||
#define IDMA64_MASK(x) (0x310 + IDMA64_INT_##x) /* rw (set = irq enabled) */
|
||||
#define IDMA64_CLEAR(x) (0x338 + IDMA64_INT_##x) /* w (ack, affects "raw") */
|
||||
|
||||
/* Common registers */
|
||||
|
||||
#define IDMA64_STATUS_INT 0x360 /* r */
|
||||
#define IDMA64_CFG 0x398
|
||||
#define IDMA64_CH_EN 0x3a0
|
||||
|
||||
/* Bitfields in CFG */
|
||||
#define IDMA64_CFG_DMA_EN (1 << 0)
|
||||
|
||||
/* Hardware descriptor for Linked LIst transfers */
|
||||
struct idma64_lli {
|
||||
u64 sar;
|
||||
u64 dar;
|
||||
u64 llp;
|
||||
u32 ctllo;
|
||||
u32 ctlhi;
|
||||
u32 sstat;
|
||||
u32 dstat;
|
||||
};
|
||||
|
||||
struct idma64_hw_desc {
|
||||
struct idma64_lli *lli;
|
||||
dma_addr_t llp;
|
||||
dma_addr_t phys;
|
||||
unsigned int len;
|
||||
};
|
||||
|
||||
struct idma64_desc {
|
||||
struct virt_dma_desc vdesc;
|
||||
enum dma_transfer_direction direction;
|
||||
struct idma64_hw_desc *hw;
|
||||
unsigned int ndesc;
|
||||
size_t length;
|
||||
enum dma_status status;
|
||||
};
|
||||
|
||||
static inline struct idma64_desc *to_idma64_desc(struct virt_dma_desc *vdesc)
|
||||
{
|
||||
return container_of(vdesc, struct idma64_desc, vdesc);
|
||||
}
|
||||
|
||||
struct idma64_chan {
|
||||
struct virt_dma_chan vchan;
|
||||
|
||||
void __iomem *regs;
|
||||
|
||||
/* hardware configuration */
|
||||
enum dma_transfer_direction direction;
|
||||
unsigned int mask;
|
||||
struct dma_slave_config config;
|
||||
|
||||
void *pool;
|
||||
struct idma64_desc *desc;
|
||||
};
|
||||
|
||||
static inline struct idma64_chan *to_idma64_chan(struct dma_chan *chan)
|
||||
{
|
||||
return container_of(chan, struct idma64_chan, vchan.chan);
|
||||
}
|
||||
|
||||
#define channel_set_bit(idma64, reg, mask) \
|
||||
dma_writel(idma64, reg, ((mask) << 8) | (mask))
|
||||
#define channel_clear_bit(idma64, reg, mask) \
|
||||
dma_writel(idma64, reg, ((mask) << 8) | 0)
|
||||
|
||||
static inline u32 idma64c_readl(struct idma64_chan *idma64c, int offset)
|
||||
{
|
||||
return readl(idma64c->regs + offset);
|
||||
}
|
||||
|
||||
static inline void idma64c_writel(struct idma64_chan *idma64c, int offset,
|
||||
u32 value)
|
||||
{
|
||||
writel(value, idma64c->regs + offset);
|
||||
}
|
||||
|
||||
#define channel_readl(idma64c, reg) \
|
||||
idma64c_readl(idma64c, IDMA64_CH_##reg)
|
||||
#define channel_writel(idma64c, reg, value) \
|
||||
idma64c_writel(idma64c, IDMA64_CH_##reg, (value))
|
||||
|
||||
static inline u64 idma64c_readq(struct idma64_chan *idma64c, int offset)
|
||||
{
|
||||
u64 l, h;
|
||||
|
||||
l = idma64c_readl(idma64c, offset);
|
||||
h = idma64c_readl(idma64c, offset + 4);
|
||||
|
||||
return l | (h << 32);
|
||||
}
|
||||
|
||||
static inline void idma64c_writeq(struct idma64_chan *idma64c, int offset,
|
||||
u64 value)
|
||||
{
|
||||
idma64c_writel(idma64c, offset, value);
|
||||
idma64c_writel(idma64c, offset + 4, value >> 32);
|
||||
}
|
||||
|
||||
#define channel_readq(idma64c, reg) \
|
||||
idma64c_readq(idma64c, IDMA64_CH_##reg)
|
||||
#define channel_writeq(idma64c, reg, value) \
|
||||
idma64c_writeq(idma64c, IDMA64_CH_##reg, (value))
|
||||
|
||||
struct idma64 {
|
||||
struct dma_device dma;
|
||||
|
||||
void __iomem *regs;
|
||||
|
||||
/* channels */
|
||||
unsigned short all_chan_mask;
|
||||
struct idma64_chan *chan;
|
||||
};
|
||||
|
||||
static inline struct idma64 *to_idma64(struct dma_device *ddev)
|
||||
{
|
||||
return container_of(ddev, struct idma64, dma);
|
||||
}
|
||||
|
||||
static inline u32 idma64_readl(struct idma64 *idma64, int offset)
|
||||
{
|
||||
return readl(idma64->regs + offset);
|
||||
}
|
||||
|
||||
static inline void idma64_writel(struct idma64 *idma64, int offset, u32 value)
|
||||
{
|
||||
writel(value, idma64->regs + offset);
|
||||
}
|
||||
|
||||
#define dma_readl(idma64, reg) \
|
||||
idma64_readl(idma64, IDMA64_##reg)
|
||||
#define dma_writel(idma64, reg, value) \
|
||||
idma64_writel(idma64, IDMA64_##reg, (value))
|
||||
|
||||
/**
|
||||
* struct idma64_chip - representation of DesignWare DMA controller hardware
|
||||
* @dev: struct device of the DMA controller
|
||||
* @irq: irq line
|
||||
* @regs: memory mapped I/O space
|
||||
* @idma64: struct idma64 that is filed by idma64_probe()
|
||||
*/
|
||||
struct idma64_chip {
|
||||
struct device *dev;
|
||||
int irq;
|
||||
void __iomem *regs;
|
||||
struct idma64 *idma64;
|
||||
};
|
||||
|
||||
#endif /* __DMA_IDMA64_H__ */
|
||||
|
|
@ -328,6 +328,29 @@ config INTEL_SOC_PMIC
|
|||
thermal, charger and related power management functions
|
||||
on these systems.
|
||||
|
||||
config MFD_INTEL_LPSS
|
||||
tristate
|
||||
select COMMON_CLK
|
||||
select MFD_CORE
|
||||
|
||||
config MFD_INTEL_LPSS_ACPI
|
||||
tristate "Intel Low Power Subsystem support in ACPI mode"
|
||||
select MFD_INTEL_LPSS
|
||||
depends on X86 && ACPI
|
||||
help
|
||||
This driver supports Intel Low Power Subsystem (LPSS) devices such as
|
||||
I2C, SPI and HS-UART starting from Intel Sunrisepoint (Intel Skylake
|
||||
PCH) in ACPI mode.
|
||||
|
||||
config MFD_INTEL_LPSS_PCI
|
||||
tristate "Intel Low Power Subsystem support in PCI mode"
|
||||
select MFD_INTEL_LPSS
|
||||
depends on X86 && PCI
|
||||
help
|
||||
This driver supports Intel Low Power Subsystem (LPSS) devices such as
|
||||
I2C, SPI and HS-UART starting from Intel Sunrisepoint (Intel Skylake
|
||||
PCH) in PCI mode.
|
||||
|
||||
config MFD_INTEL_MSIC
|
||||
bool "Intel MSIC"
|
||||
depends on INTEL_SCU_IPC
|
||||
|
|
|
|||
|
|
@ -161,6 +161,9 @@ obj-$(CONFIG_TPS65911_COMPARATOR) += tps65911-comparator.o
|
|||
obj-$(CONFIG_MFD_TPS65090) += tps65090.o
|
||||
obj-$(CONFIG_MFD_AAT2870_CORE) += aat2870-core.o
|
||||
obj-$(CONFIG_MFD_ATMEL_HLCDC) += atmel-hlcdc.o
|
||||
obj-$(CONFIG_MFD_INTEL_LPSS) += intel-lpss.o
|
||||
obj-$(CONFIG_MFD_INTEL_LPSS_PCI) += intel-lpss-pci.o
|
||||
obj-$(CONFIG_MFD_INTEL_LPSS_ACPI) += intel-lpss-acpi.o
|
||||
obj-$(CONFIG_MFD_INTEL_MSIC) += intel_msic.o
|
||||
obj-$(CONFIG_MFD_PALMAS) += palmas.o
|
||||
obj-$(CONFIG_MFD_VIPERBOARD) += viperboard.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,84 @@
|
|||
/*
|
||||
* Intel LPSS ACPI support.
|
||||
*
|
||||
* Copyright (C) 2015, Intel Corporation
|
||||
*
|
||||
* Authors: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
|
||||
* Mika Westerberg <mika.westerberg@linux.intel.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#include <linux/acpi.h>
|
||||
#include <linux/ioport.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/pm.h>
|
||||
#include <linux/pm_runtime.h>
|
||||
#include <linux/platform_device.h>
|
||||
|
||||
#include "intel-lpss.h"
|
||||
|
||||
static const struct intel_lpss_platform_info spt_info = {
|
||||
.clk_rate = 120000000,
|
||||
};
|
||||
|
||||
static const struct acpi_device_id intel_lpss_acpi_ids[] = {
|
||||
/* SPT */
|
||||
{ "INT3446", (kernel_ulong_t)&spt_info },
|
||||
{ "INT3447", (kernel_ulong_t)&spt_info },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(acpi, intel_lpss_acpi_ids);
|
||||
|
||||
static int intel_lpss_acpi_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct intel_lpss_platform_info *info;
|
||||
const struct acpi_device_id *id;
|
||||
|
||||
id = acpi_match_device(intel_lpss_acpi_ids, &pdev->dev);
|
||||
if (!id)
|
||||
return -ENODEV;
|
||||
|
||||
info = devm_kmemdup(&pdev->dev, (void *)id->driver_data, sizeof(*info),
|
||||
GFP_KERNEL);
|
||||
if (!info)
|
||||
return -ENOMEM;
|
||||
|
||||
info->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
info->irq = platform_get_irq(pdev, 0);
|
||||
|
||||
pm_runtime_set_active(&pdev->dev);
|
||||
pm_runtime_enable(&pdev->dev);
|
||||
|
||||
return intel_lpss_probe(&pdev->dev, info);
|
||||
}
|
||||
|
||||
static int intel_lpss_acpi_remove(struct platform_device *pdev)
|
||||
{
|
||||
intel_lpss_remove(&pdev->dev);
|
||||
pm_runtime_disable(&pdev->dev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static INTEL_LPSS_PM_OPS(intel_lpss_acpi_pm_ops);
|
||||
|
||||
static struct platform_driver intel_lpss_acpi_driver = {
|
||||
.probe = intel_lpss_acpi_probe,
|
||||
.remove = intel_lpss_acpi_remove,
|
||||
.driver = {
|
||||
.name = "intel-lpss",
|
||||
.acpi_match_table = intel_lpss_acpi_ids,
|
||||
.pm = &intel_lpss_acpi_pm_ops,
|
||||
},
|
||||
};
|
||||
|
||||
module_platform_driver(intel_lpss_acpi_driver);
|
||||
|
||||
MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
|
||||
MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
|
||||
MODULE_DESCRIPTION("Intel LPSS ACPI driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -0,0 +1,113 @@
|
|||
/*
|
||||
* Intel LPSS PCI support.
|
||||
*
|
||||
* Copyright (C) 2015, Intel Corporation
|
||||
*
|
||||
* Authors: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
|
||||
* Mika Westerberg <mika.westerberg@linux.intel.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#include <linux/ioport.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/pci.h>
|
||||
#include <linux/pm.h>
|
||||
#include <linux/pm_runtime.h>
|
||||
|
||||
#include "intel-lpss.h"
|
||||
|
||||
static int intel_lpss_pci_probe(struct pci_dev *pdev,
|
||||
const struct pci_device_id *id)
|
||||
{
|
||||
struct intel_lpss_platform_info *info;
|
||||
int ret;
|
||||
|
||||
ret = pcim_enable_device(pdev);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
info = devm_kmemdup(&pdev->dev, (void *)id->driver_data, sizeof(*info),
|
||||
GFP_KERNEL);
|
||||
if (!info)
|
||||
return -ENOMEM;
|
||||
|
||||
info->mem = &pdev->resource[0];
|
||||
info->irq = pdev->irq;
|
||||
|
||||
/* Probably it is enough to set this for iDMA capable devices only */
|
||||
pci_set_master(pdev);
|
||||
|
||||
ret = intel_lpss_probe(&pdev->dev, info);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
pm_runtime_put(&pdev->dev);
|
||||
pm_runtime_allow(&pdev->dev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void intel_lpss_pci_remove(struct pci_dev *pdev)
|
||||
{
|
||||
pm_runtime_forbid(&pdev->dev);
|
||||
pm_runtime_get_sync(&pdev->dev);
|
||||
|
||||
intel_lpss_remove(&pdev->dev);
|
||||
}
|
||||
|
||||
static INTEL_LPSS_PM_OPS(intel_lpss_pci_pm_ops);
|
||||
|
||||
static const struct intel_lpss_platform_info spt_info = {
|
||||
.clk_rate = 120000000,
|
||||
};
|
||||
|
||||
static const struct intel_lpss_platform_info spt_uart_info = {
|
||||
.clk_rate = 120000000,
|
||||
.clk_con_id = "baudclk",
|
||||
};
|
||||
|
||||
static const struct pci_device_id intel_lpss_pci_ids[] = {
|
||||
/* SPT-LP */
|
||||
{ PCI_VDEVICE(INTEL, 0x9d27), (kernel_ulong_t)&spt_uart_info },
|
||||
{ PCI_VDEVICE(INTEL, 0x9d28), (kernel_ulong_t)&spt_uart_info },
|
||||
{ PCI_VDEVICE(INTEL, 0x9d29), (kernel_ulong_t)&spt_info },
|
||||
{ PCI_VDEVICE(INTEL, 0x9d2a), (kernel_ulong_t)&spt_info },
|
||||
{ PCI_VDEVICE(INTEL, 0x9d60), (kernel_ulong_t)&spt_info },
|
||||
{ PCI_VDEVICE(INTEL, 0x9d61), (kernel_ulong_t)&spt_info },
|
||||
{ PCI_VDEVICE(INTEL, 0x9d62), (kernel_ulong_t)&spt_info },
|
||||
{ PCI_VDEVICE(INTEL, 0x9d63), (kernel_ulong_t)&spt_info },
|
||||
{ PCI_VDEVICE(INTEL, 0x9d64), (kernel_ulong_t)&spt_info },
|
||||
{ PCI_VDEVICE(INTEL, 0x9d65), (kernel_ulong_t)&spt_info },
|
||||
{ PCI_VDEVICE(INTEL, 0x9d66), (kernel_ulong_t)&spt_uart_info },
|
||||
/* SPT-H */
|
||||
{ PCI_VDEVICE(INTEL, 0xa127), (kernel_ulong_t)&spt_uart_info },
|
||||
{ PCI_VDEVICE(INTEL, 0xa128), (kernel_ulong_t)&spt_uart_info },
|
||||
{ PCI_VDEVICE(INTEL, 0xa129), (kernel_ulong_t)&spt_info },
|
||||
{ PCI_VDEVICE(INTEL, 0xa12a), (kernel_ulong_t)&spt_info },
|
||||
{ PCI_VDEVICE(INTEL, 0xa160), (kernel_ulong_t)&spt_info },
|
||||
{ PCI_VDEVICE(INTEL, 0xa161), (kernel_ulong_t)&spt_info },
|
||||
{ PCI_VDEVICE(INTEL, 0xa166), (kernel_ulong_t)&spt_uart_info },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(pci, intel_lpss_pci_ids);
|
||||
|
||||
static struct pci_driver intel_lpss_pci_driver = {
|
||||
.name = "intel-lpss",
|
||||
.id_table = intel_lpss_pci_ids,
|
||||
.probe = intel_lpss_pci_probe,
|
||||
.remove = intel_lpss_pci_remove,
|
||||
.driver = {
|
||||
.pm = &intel_lpss_pci_pm_ops,
|
||||
},
|
||||
};
|
||||
|
||||
module_pci_driver(intel_lpss_pci_driver);
|
||||
|
||||
MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
|
||||
MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
|
||||
MODULE_DESCRIPTION("Intel LPSS PCI driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -0,0 +1,524 @@
|
|||
/*
|
||||
* Intel Sunrisepoint LPSS core support.
|
||||
*
|
||||
* Copyright (C) 2015, Intel Corporation
|
||||
*
|
||||
* Authors: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
|
||||
* Mika Westerberg <mika.westerberg@linux.intel.com>
|
||||
* Heikki Krogerus <heikki.krogerus@linux.intel.com>
|
||||
* Jarkko Nikula <jarkko.nikula@linux.intel.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#include <linux/clk.h>
|
||||
#include <linux/clkdev.h>
|
||||
#include <linux/clk-provider.h>
|
||||
#include <linux/debugfs.h>
|
||||
#include <linux/idr.h>
|
||||
#include <linux/ioport.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/mfd/core.h>
|
||||
#include <linux/pm_qos.h>
|
||||
#include <linux/pm_runtime.h>
|
||||
#include <linux/seq_file.h>
|
||||
|
||||
#include "intel-lpss.h"
|
||||
|
||||
#define LPSS_DEV_OFFSET 0x000
|
||||
#define LPSS_DEV_SIZE 0x200
|
||||
#define LPSS_PRIV_OFFSET 0x200
|
||||
#define LPSS_PRIV_SIZE 0x100
|
||||
#define LPSS_IDMA64_OFFSET 0x800
|
||||
#define LPSS_IDMA64_SIZE 0x800
|
||||
|
||||
/* Offsets from lpss->priv */
|
||||
#define LPSS_PRIV_RESETS 0x04
|
||||
#define LPSS_PRIV_RESETS_FUNC BIT(2)
|
||||
#define LPSS_PRIV_RESETS_IDMA 0x3
|
||||
|
||||
#define LPSS_PRIV_ACTIVELTR 0x10
|
||||
#define LPSS_PRIV_IDLELTR 0x14
|
||||
|
||||
#define LPSS_PRIV_LTR_REQ BIT(15)
|
||||
#define LPSS_PRIV_LTR_SCALE_MASK 0xc00
|
||||
#define LPSS_PRIV_LTR_SCALE_1US 0x800
|
||||
#define LPSS_PRIV_LTR_SCALE_32US 0xc00
|
||||
#define LPSS_PRIV_LTR_VALUE_MASK 0x3ff
|
||||
|
||||
#define LPSS_PRIV_SSP_REG 0x20
|
||||
#define LPSS_PRIV_SSP_REG_DIS_DMA_FIN BIT(0)
|
||||
|
||||
#define LPSS_PRIV_REMAP_ADDR_LO 0x40
|
||||
#define LPSS_PRIV_REMAP_ADDR_HI 0x44
|
||||
|
||||
#define LPSS_PRIV_CAPS 0xfc
|
||||
#define LPSS_PRIV_CAPS_NO_IDMA BIT(8)
|
||||
#define LPSS_PRIV_CAPS_TYPE_SHIFT 4
|
||||
#define LPSS_PRIV_CAPS_TYPE_MASK (0xf << LPSS_PRIV_CAPS_TYPE_SHIFT)
|
||||
|
||||
/* This matches the type field in CAPS register */
|
||||
enum intel_lpss_dev_type {
|
||||
LPSS_DEV_I2C = 0,
|
||||
LPSS_DEV_UART,
|
||||
LPSS_DEV_SPI,
|
||||
};
|
||||
|
||||
struct intel_lpss {
|
||||
const struct intel_lpss_platform_info *info;
|
||||
enum intel_lpss_dev_type type;
|
||||
struct clk *clk;
|
||||
struct clk_lookup *clock;
|
||||
const struct mfd_cell *cell;
|
||||
struct device *dev;
|
||||
void __iomem *priv;
|
||||
int devid;
|
||||
u32 caps;
|
||||
u32 active_ltr;
|
||||
u32 idle_ltr;
|
||||
struct dentry *debugfs;
|
||||
};
|
||||
|
||||
static const struct resource intel_lpss_dev_resources[] = {
|
||||
DEFINE_RES_MEM_NAMED(LPSS_DEV_OFFSET, LPSS_DEV_SIZE, "lpss_dev"),
|
||||
DEFINE_RES_MEM_NAMED(LPSS_PRIV_OFFSET, LPSS_PRIV_SIZE, "lpss_priv"),
|
||||
DEFINE_RES_IRQ(0),
|
||||
};
|
||||
|
||||
static const struct resource intel_lpss_idma64_resources[] = {
|
||||
DEFINE_RES_MEM(LPSS_IDMA64_OFFSET, LPSS_IDMA64_SIZE),
|
||||
DEFINE_RES_IRQ(0),
|
||||
};
|
||||
|
||||
#define LPSS_IDMA64_DRIVER_NAME "idma64"
|
||||
|
||||
/*
|
||||
* Cells needs to be ordered so that the iDMA is created first. This is
|
||||
* because we need to be sure the DMA is available when the host controller
|
||||
* driver is probed.
|
||||
*/
|
||||
static const struct mfd_cell intel_lpss_idma64_cell = {
|
||||
.name = LPSS_IDMA64_DRIVER_NAME,
|
||||
.num_resources = ARRAY_SIZE(intel_lpss_idma64_resources),
|
||||
.resources = intel_lpss_idma64_resources,
|
||||
};
|
||||
|
||||
static const struct mfd_cell intel_lpss_i2c_cell = {
|
||||
.name = "i2c_designware",
|
||||
.num_resources = ARRAY_SIZE(intel_lpss_dev_resources),
|
||||
.resources = intel_lpss_dev_resources,
|
||||
};
|
||||
|
||||
static const struct mfd_cell intel_lpss_uart_cell = {
|
||||
.name = "dw-apb-uart",
|
||||
.num_resources = ARRAY_SIZE(intel_lpss_dev_resources),
|
||||
.resources = intel_lpss_dev_resources,
|
||||
};
|
||||
|
||||
static const struct mfd_cell intel_lpss_spi_cell = {
|
||||
.name = "pxa2xx-spi",
|
||||
.num_resources = ARRAY_SIZE(intel_lpss_dev_resources),
|
||||
.resources = intel_lpss_dev_resources,
|
||||
};
|
||||
|
||||
static DEFINE_IDA(intel_lpss_devid_ida);
|
||||
static struct dentry *intel_lpss_debugfs;
|
||||
|
||||
static int intel_lpss_request_dma_module(const char *name)
|
||||
{
|
||||
static bool intel_lpss_dma_requested;
|
||||
|
||||
if (intel_lpss_dma_requested)
|
||||
return 0;
|
||||
|
||||
intel_lpss_dma_requested = true;
|
||||
return request_module("%s", name);
|
||||
}
|
||||
|
||||
static void intel_lpss_cache_ltr(struct intel_lpss *lpss)
|
||||
{
|
||||
lpss->active_ltr = readl(lpss->priv + LPSS_PRIV_ACTIVELTR);
|
||||
lpss->idle_ltr = readl(lpss->priv + LPSS_PRIV_IDLELTR);
|
||||
}
|
||||
|
||||
static int intel_lpss_debugfs_add(struct intel_lpss *lpss)
|
||||
{
|
||||
struct dentry *dir;
|
||||
|
||||
dir = debugfs_create_dir(dev_name(lpss->dev), intel_lpss_debugfs);
|
||||
if (IS_ERR(dir))
|
||||
return PTR_ERR(dir);
|
||||
|
||||
/* Cache the values into lpss structure */
|
||||
intel_lpss_cache_ltr(lpss);
|
||||
|
||||
debugfs_create_x32("capabilities", S_IRUGO, dir, &lpss->caps);
|
||||
debugfs_create_x32("active_ltr", S_IRUGO, dir, &lpss->active_ltr);
|
||||
debugfs_create_x32("idle_ltr", S_IRUGO, dir, &lpss->idle_ltr);
|
||||
|
||||
lpss->debugfs = dir;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void intel_lpss_debugfs_remove(struct intel_lpss *lpss)
|
||||
{
|
||||
debugfs_remove_recursive(lpss->debugfs);
|
||||
}
|
||||
|
||||
static void intel_lpss_ltr_set(struct device *dev, s32 val)
|
||||
{
|
||||
struct intel_lpss *lpss = dev_get_drvdata(dev);
|
||||
u32 ltr;
|
||||
|
||||
/*
|
||||
* Program latency tolerance (LTR) accordingly what has been asked
|
||||
* by the PM QoS layer or disable it in case we were passed
|
||||
* negative value or PM_QOS_LATENCY_ANY.
|
||||
*/
|
||||
ltr = readl(lpss->priv + LPSS_PRIV_ACTIVELTR);
|
||||
|
||||
if (val == PM_QOS_LATENCY_ANY || val < 0) {
|
||||
ltr &= ~LPSS_PRIV_LTR_REQ;
|
||||
} else {
|
||||
ltr |= LPSS_PRIV_LTR_REQ;
|
||||
ltr &= ~LPSS_PRIV_LTR_SCALE_MASK;
|
||||
ltr &= ~LPSS_PRIV_LTR_VALUE_MASK;
|
||||
|
||||
if (val > LPSS_PRIV_LTR_VALUE_MASK)
|
||||
ltr |= LPSS_PRIV_LTR_SCALE_32US | val >> 5;
|
||||
else
|
||||
ltr |= LPSS_PRIV_LTR_SCALE_1US | val;
|
||||
}
|
||||
|
||||
if (ltr == lpss->active_ltr)
|
||||
return;
|
||||
|
||||
writel(ltr, lpss->priv + LPSS_PRIV_ACTIVELTR);
|
||||
writel(ltr, lpss->priv + LPSS_PRIV_IDLELTR);
|
||||
|
||||
/* Cache the values into lpss structure */
|
||||
intel_lpss_cache_ltr(lpss);
|
||||
}
|
||||
|
||||
static void intel_lpss_ltr_expose(struct intel_lpss *lpss)
|
||||
{
|
||||
lpss->dev->power.set_latency_tolerance = intel_lpss_ltr_set;
|
||||
dev_pm_qos_expose_latency_tolerance(lpss->dev);
|
||||
}
|
||||
|
||||
static void intel_lpss_ltr_hide(struct intel_lpss *lpss)
|
||||
{
|
||||
dev_pm_qos_hide_latency_tolerance(lpss->dev);
|
||||
lpss->dev->power.set_latency_tolerance = NULL;
|
||||
}
|
||||
|
||||
static int intel_lpss_assign_devs(struct intel_lpss *lpss)
|
||||
{
|
||||
unsigned int type;
|
||||
|
||||
type = lpss->caps & LPSS_PRIV_CAPS_TYPE_MASK;
|
||||
type >>= LPSS_PRIV_CAPS_TYPE_SHIFT;
|
||||
|
||||
switch (type) {
|
||||
case LPSS_DEV_I2C:
|
||||
lpss->cell = &intel_lpss_i2c_cell;
|
||||
break;
|
||||
case LPSS_DEV_UART:
|
||||
lpss->cell = &intel_lpss_uart_cell;
|
||||
break;
|
||||
case LPSS_DEV_SPI:
|
||||
lpss->cell = &intel_lpss_spi_cell;
|
||||
break;
|
||||
default:
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
lpss->type = type;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static bool intel_lpss_has_idma(const struct intel_lpss *lpss)
|
||||
{
|
||||
return (lpss->caps & LPSS_PRIV_CAPS_NO_IDMA) == 0;
|
||||
}
|
||||
|
||||
static void intel_lpss_set_remap_addr(const struct intel_lpss *lpss)
|
||||
{
|
||||
resource_size_t addr = lpss->info->mem->start;
|
||||
|
||||
writel(addr, lpss->priv + LPSS_PRIV_REMAP_ADDR_LO);
|
||||
#if BITS_PER_LONG > 32
|
||||
writel(addr >> 32, lpss->priv + LPSS_PRIV_REMAP_ADDR_HI);
|
||||
#else
|
||||
writel(0, lpss->priv + LPSS_PRIV_REMAP_ADDR_HI);
|
||||
#endif
|
||||
}
|
||||
|
||||
static void intel_lpss_deassert_reset(const struct intel_lpss *lpss)
|
||||
{
|
||||
u32 value = LPSS_PRIV_RESETS_FUNC | LPSS_PRIV_RESETS_IDMA;
|
||||
|
||||
/* Bring out the device from reset */
|
||||
writel(value, lpss->priv + LPSS_PRIV_RESETS);
|
||||
}
|
||||
|
||||
static void intel_lpss_init_dev(const struct intel_lpss *lpss)
|
||||
{
|
||||
u32 value = LPSS_PRIV_SSP_REG_DIS_DMA_FIN;
|
||||
|
||||
intel_lpss_deassert_reset(lpss);
|
||||
|
||||
if (!intel_lpss_has_idma(lpss))
|
||||
return;
|
||||
|
||||
intel_lpss_set_remap_addr(lpss);
|
||||
|
||||
/* Make sure that SPI multiblock DMA transfers are re-enabled */
|
||||
if (lpss->type == LPSS_DEV_SPI)
|
||||
writel(value, lpss->priv + LPSS_PRIV_SSP_REG);
|
||||
}
|
||||
|
||||
static void intel_lpss_unregister_clock_tree(struct clk *clk)
|
||||
{
|
||||
struct clk *parent;
|
||||
|
||||
while (clk) {
|
||||
parent = clk_get_parent(clk);
|
||||
clk_unregister(clk);
|
||||
clk = parent;
|
||||
}
|
||||
}
|
||||
|
||||
static int intel_lpss_register_clock_divider(struct intel_lpss *lpss,
|
||||
const char *devname,
|
||||
struct clk **clk)
|
||||
{
|
||||
char name[32];
|
||||
struct clk *tmp = *clk;
|
||||
|
||||
snprintf(name, sizeof(name), "%s-enable", devname);
|
||||
tmp = clk_register_gate(NULL, name, __clk_get_name(tmp), 0,
|
||||
lpss->priv, 0, 0, NULL);
|
||||
if (IS_ERR(tmp))
|
||||
return PTR_ERR(tmp);
|
||||
|
||||
snprintf(name, sizeof(name), "%s-div", devname);
|
||||
tmp = clk_register_fractional_divider(NULL, name, __clk_get_name(tmp),
|
||||
0, lpss->priv, 1, 15, 16, 15, 0,
|
||||
NULL);
|
||||
if (IS_ERR(tmp))
|
||||
return PTR_ERR(tmp);
|
||||
*clk = tmp;
|
||||
|
||||
snprintf(name, sizeof(name), "%s-update", devname);
|
||||
tmp = clk_register_gate(NULL, name, __clk_get_name(tmp),
|
||||
CLK_SET_RATE_PARENT, lpss->priv, 31, 0, NULL);
|
||||
if (IS_ERR(tmp))
|
||||
return PTR_ERR(tmp);
|
||||
*clk = tmp;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int intel_lpss_register_clock(struct intel_lpss *lpss)
|
||||
{
|
||||
const struct mfd_cell *cell = lpss->cell;
|
||||
struct clk *clk;
|
||||
char devname[24];
|
||||
int ret;
|
||||
|
||||
if (!lpss->info->clk_rate)
|
||||
return 0;
|
||||
|
||||
/* Root clock */
|
||||
clk = clk_register_fixed_rate(NULL, dev_name(lpss->dev), NULL,
|
||||
CLK_IS_ROOT, lpss->info->clk_rate);
|
||||
if (IS_ERR(clk))
|
||||
return PTR_ERR(clk);
|
||||
|
||||
snprintf(devname, sizeof(devname), "%s.%d", cell->name, lpss->devid);
|
||||
|
||||
/*
|
||||
* Support for clock divider only if it has some preset value.
|
||||
* Otherwise we assume that the divider is not used.
|
||||
*/
|
||||
if (lpss->type != LPSS_DEV_I2C) {
|
||||
ret = intel_lpss_register_clock_divider(lpss, devname, &clk);
|
||||
if (ret)
|
||||
goto err_clk_register;
|
||||
}
|
||||
|
||||
ret = -ENOMEM;
|
||||
|
||||
/* Clock for the host controller */
|
||||
lpss->clock = clkdev_create(clk, lpss->info->clk_con_id, "%s", devname);
|
||||
if (!lpss->clock)
|
||||
goto err_clk_register;
|
||||
|
||||
lpss->clk = clk;
|
||||
|
||||
return 0;
|
||||
|
||||
err_clk_register:
|
||||
intel_lpss_unregister_clock_tree(clk);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void intel_lpss_unregister_clock(struct intel_lpss *lpss)
|
||||
{
|
||||
if (IS_ERR_OR_NULL(lpss->clk))
|
||||
return;
|
||||
|
||||
clkdev_drop(lpss->clock);
|
||||
intel_lpss_unregister_clock_tree(lpss->clk);
|
||||
}
|
||||
|
||||
int intel_lpss_probe(struct device *dev,
|
||||
const struct intel_lpss_platform_info *info)
|
||||
{
|
||||
struct intel_lpss *lpss;
|
||||
int ret;
|
||||
|
||||
if (!info || !info->mem || info->irq <= 0)
|
||||
return -EINVAL;
|
||||
|
||||
lpss = devm_kzalloc(dev, sizeof(*lpss), GFP_KERNEL);
|
||||
if (!lpss)
|
||||
return -ENOMEM;
|
||||
|
||||
lpss->priv = devm_ioremap(dev, info->mem->start + LPSS_PRIV_OFFSET,
|
||||
LPSS_PRIV_SIZE);
|
||||
if (!lpss->priv)
|
||||
return -ENOMEM;
|
||||
|
||||
lpss->info = info;
|
||||
lpss->dev = dev;
|
||||
lpss->caps = readl(lpss->priv + LPSS_PRIV_CAPS);
|
||||
|
||||
dev_set_drvdata(dev, lpss);
|
||||
|
||||
ret = intel_lpss_assign_devs(lpss);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
intel_lpss_init_dev(lpss);
|
||||
|
||||
lpss->devid = ida_simple_get(&intel_lpss_devid_ida, 0, 0, GFP_KERNEL);
|
||||
if (lpss->devid < 0)
|
||||
return lpss->devid;
|
||||
|
||||
ret = intel_lpss_register_clock(lpss);
|
||||
if (ret)
|
||||
goto err_clk_register;
|
||||
|
||||
intel_lpss_ltr_expose(lpss);
|
||||
|
||||
ret = intel_lpss_debugfs_add(lpss);
|
||||
if (ret)
|
||||
dev_warn(dev, "Failed to create debugfs entries\n");
|
||||
|
||||
if (intel_lpss_has_idma(lpss)) {
|
||||
/*
|
||||
* Ensure the DMA driver is loaded before the host
|
||||
* controller device appears, so that the host controller
|
||||
* driver can request its DMA channels as early as
|
||||
* possible.
|
||||
*
|
||||
* If the DMA module is not there that's OK as well.
|
||||
*/
|
||||
intel_lpss_request_dma_module(LPSS_IDMA64_DRIVER_NAME);
|
||||
|
||||
ret = mfd_add_devices(dev, lpss->devid, &intel_lpss_idma64_cell,
|
||||
1, info->mem, info->irq, NULL);
|
||||
if (ret)
|
||||
dev_warn(dev, "Failed to add %s, fallback to PIO\n",
|
||||
LPSS_IDMA64_DRIVER_NAME);
|
||||
}
|
||||
|
||||
ret = mfd_add_devices(dev, lpss->devid, lpss->cell,
|
||||
1, info->mem, info->irq, NULL);
|
||||
if (ret)
|
||||
goto err_remove_ltr;
|
||||
|
||||
return 0;
|
||||
|
||||
err_remove_ltr:
|
||||
intel_lpss_debugfs_remove(lpss);
|
||||
intel_lpss_ltr_hide(lpss);
|
||||
|
||||
err_clk_register:
|
||||
ida_simple_remove(&intel_lpss_devid_ida, lpss->devid);
|
||||
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(intel_lpss_probe);
|
||||
|
||||
void intel_lpss_remove(struct device *dev)
|
||||
{
|
||||
struct intel_lpss *lpss = dev_get_drvdata(dev);
|
||||
|
||||
mfd_remove_devices(dev);
|
||||
intel_lpss_debugfs_remove(lpss);
|
||||
intel_lpss_ltr_hide(lpss);
|
||||
intel_lpss_unregister_clock(lpss);
|
||||
ida_simple_remove(&intel_lpss_devid_ida, lpss->devid);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(intel_lpss_remove);
|
||||
|
||||
static int resume_lpss_device(struct device *dev, void *data)
|
||||
{
|
||||
pm_runtime_resume(dev);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int intel_lpss_prepare(struct device *dev)
|
||||
{
|
||||
/*
|
||||
* Resume both child devices before entering system sleep. This
|
||||
* ensures that they are in proper state before they get suspended.
|
||||
*/
|
||||
device_for_each_child_reverse(dev, NULL, resume_lpss_device);
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(intel_lpss_prepare);
|
||||
|
||||
int intel_lpss_suspend(struct device *dev)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(intel_lpss_suspend);
|
||||
|
||||
int intel_lpss_resume(struct device *dev)
|
||||
{
|
||||
struct intel_lpss *lpss = dev_get_drvdata(dev);
|
||||
|
||||
intel_lpss_init_dev(lpss);
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(intel_lpss_resume);
|
||||
|
||||
static int __init intel_lpss_init(void)
|
||||
{
|
||||
intel_lpss_debugfs = debugfs_create_dir("intel_lpss", NULL);
|
||||
return 0;
|
||||
}
|
||||
module_init(intel_lpss_init);
|
||||
|
||||
static void __exit intel_lpss_exit(void)
|
||||
{
|
||||
debugfs_remove(intel_lpss_debugfs);
|
||||
}
|
||||
module_exit(intel_lpss_exit);
|
||||
|
||||
MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
|
||||
MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
|
||||
MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
|
||||
MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@linux.intel.com>");
|
||||
MODULE_DESCRIPTION("Intel LPSS core driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -0,0 +1,62 @@
|
|||
/*
|
||||
* Intel LPSS core support.
|
||||
*
|
||||
* Copyright (C) 2015, Intel Corporation
|
||||
*
|
||||
* Authors: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
|
||||
* Mika Westerberg <mika.westerberg@linux.intel.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#ifndef __MFD_INTEL_LPSS_H
|
||||
#define __MFD_INTEL_LPSS_H
|
||||
|
||||
struct device;
|
||||
struct resource;
|
||||
|
||||
struct intel_lpss_platform_info {
|
||||
struct resource *mem;
|
||||
int irq;
|
||||
unsigned long clk_rate;
|
||||
const char *clk_con_id;
|
||||
};
|
||||
|
||||
int intel_lpss_probe(struct device *dev,
|
||||
const struct intel_lpss_platform_info *info);
|
||||
void intel_lpss_remove(struct device *dev);
|
||||
|
||||
#ifdef CONFIG_PM
|
||||
int intel_lpss_prepare(struct device *dev);
|
||||
int intel_lpss_suspend(struct device *dev);
|
||||
int intel_lpss_resume(struct device *dev);
|
||||
|
||||
#ifdef CONFIG_PM_SLEEP
|
||||
#define INTEL_LPSS_SLEEP_PM_OPS \
|
||||
.prepare = intel_lpss_prepare, \
|
||||
.suspend = intel_lpss_suspend, \
|
||||
.resume = intel_lpss_resume, \
|
||||
.freeze = intel_lpss_suspend, \
|
||||
.thaw = intel_lpss_resume, \
|
||||
.poweroff = intel_lpss_suspend, \
|
||||
.restore = intel_lpss_resume,
|
||||
#endif
|
||||
|
||||
#define INTEL_LPSS_RUNTIME_PM_OPS \
|
||||
.runtime_suspend = intel_lpss_suspend, \
|
||||
.runtime_resume = intel_lpss_resume,
|
||||
|
||||
#else /* !CONFIG_PM */
|
||||
#define INTEL_LPSS_SLEEP_PM_OPS
|
||||
#define INTEL_LPSS_RUNTIME_PM_OPS
|
||||
#endif /* CONFIG_PM */
|
||||
|
||||
#define INTEL_LPSS_PM_OPS(name) \
|
||||
const struct dev_pm_ops name = { \
|
||||
INTEL_LPSS_SLEEP_PM_OPS \
|
||||
INTEL_LPSS_RUNTIME_PM_OPS \
|
||||
}
|
||||
|
||||
#endif /* __MFD_INTEL_LPSS_H */
|
||||
|
|
@ -302,7 +302,7 @@ void mfd_remove_devices(struct device *parent)
|
|||
{
|
||||
atomic_t *cnts = NULL;
|
||||
|
||||
device_for_each_child(parent, &cnts, mfd_remove_devices_fn);
|
||||
device_for_each_child_reverse(parent, &cnts, mfd_remove_devices_fn);
|
||||
kfree(cnts);
|
||||
}
|
||||
EXPORT_SYMBOL(mfd_remove_devices);
|
||||
|
|
|
|||
|
|
@ -959,6 +959,8 @@ extern int __must_check device_add(struct device *dev);
|
|||
extern void device_del(struct device *dev);
|
||||
extern int device_for_each_child(struct device *dev, void *data,
|
||||
int (*fn)(struct device *dev, void *data));
|
||||
extern int device_for_each_child_reverse(struct device *dev, void *data,
|
||||
int (*fn)(struct device *dev, void *data));
|
||||
extern struct device *device_find_child(struct device *dev, void *data,
|
||||
int (*match)(struct device *dev, void *data));
|
||||
extern int device_rename(struct device *dev, const char *new_name);
|
||||
|
|
|
|||
|
|
@ -63,6 +63,7 @@ extern void klist_iter_init(struct klist *k, struct klist_iter *i);
|
|||
extern void klist_iter_init_node(struct klist *k, struct klist_iter *i,
|
||||
struct klist_node *n);
|
||||
extern void klist_iter_exit(struct klist_iter *i);
|
||||
extern struct klist_node *klist_prev(struct klist_iter *i);
|
||||
extern struct klist_node *klist_next(struct klist_iter *i);
|
||||
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -161,6 +161,8 @@ void dev_pm_qos_hide_flags(struct device *dev);
|
|||
int dev_pm_qos_update_flags(struct device *dev, s32 mask, bool set);
|
||||
s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev);
|
||||
int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val);
|
||||
int dev_pm_qos_expose_latency_tolerance(struct device *dev);
|
||||
void dev_pm_qos_hide_latency_tolerance(struct device *dev);
|
||||
|
||||
static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev)
|
||||
{
|
||||
|
|
@ -229,6 +231,9 @@ static inline s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev)
|
|||
{ return PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT; }
|
||||
static inline int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val)
|
||||
{ return 0; }
|
||||
static inline int dev_pm_qos_expose_latency_tolerance(struct device *dev)
|
||||
{ return 0; }
|
||||
static inline void dev_pm_qos_hide_latency_tolerance(struct device *dev) {}
|
||||
|
||||
static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev) { return 0; }
|
||||
static inline s32 dev_pm_qos_requested_flags(struct device *dev) { return 0; }
|
||||
|
|
|
|||
41
lib/klist.c
41
lib/klist.c
|
|
@ -323,6 +323,47 @@ static struct klist_node *to_klist_node(struct list_head *n)
|
|||
return container_of(n, struct klist_node, n_node);
|
||||
}
|
||||
|
||||
/**
|
||||
* klist_prev - Ante up prev node in list.
|
||||
* @i: Iterator structure.
|
||||
*
|
||||
* First grab list lock. Decrement the reference count of the previous
|
||||
* node, if there was one. Grab the prev node, increment its reference
|
||||
* count, drop the lock, and return that prev node.
|
||||
*/
|
||||
struct klist_node *klist_prev(struct klist_iter *i)
|
||||
{
|
||||
void (*put)(struct klist_node *) = i->i_klist->put;
|
||||
struct klist_node *last = i->i_cur;
|
||||
struct klist_node *prev;
|
||||
|
||||
spin_lock(&i->i_klist->k_lock);
|
||||
|
||||
if (last) {
|
||||
prev = to_klist_node(last->n_node.prev);
|
||||
if (!klist_dec_and_del(last))
|
||||
put = NULL;
|
||||
} else
|
||||
prev = to_klist_node(i->i_klist->k_list.prev);
|
||||
|
||||
i->i_cur = NULL;
|
||||
while (prev != to_klist_node(&i->i_klist->k_list)) {
|
||||
if (likely(!knode_dead(prev))) {
|
||||
kref_get(&prev->n_ref);
|
||||
i->i_cur = prev;
|
||||
break;
|
||||
}
|
||||
prev = to_klist_node(prev->n_node.prev);
|
||||
}
|
||||
|
||||
spin_unlock(&i->i_klist->k_lock);
|
||||
|
||||
if (put && last)
|
||||
put(last);
|
||||
return i->i_cur;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(klist_prev);
|
||||
|
||||
/**
|
||||
* klist_next - Ante up next node in list.
|
||||
* @i: Iterator structure.
|
||||
|
|
|
|||
Loading…
Reference in New Issue