diff options
| -rw-r--r-- | drivers/misc/mic/Kconfig | 17 | ||||
| -rw-r--r-- | drivers/misc/mic/Makefile | 1 | ||||
| -rw-r--r-- | drivers/misc/mic/bus/Makefile | 5 | ||||
| -rw-r--r-- | drivers/misc/mic/bus/mic_bus.c | 218 | ||||
| -rw-r--r-- | include/linux/mic_bus.h | 110 |
5 files changed, 351 insertions, 0 deletions
diff --git a/drivers/misc/mic/Kconfig b/drivers/misc/mic/Kconfig index 462a5b1d8651..ee1d2ac3cd09 100644 --- a/drivers/misc/mic/Kconfig +++ b/drivers/misc/mic/Kconfig @@ -1,3 +1,20 @@ +comment "Intel MIC Bus Driver" + +config INTEL_MIC_BUS + tristate "Intel MIC Bus Driver" + depends on 64BIT && PCI && X86 && X86_DEV_DMA_OPS + help + This option is selected by any driver which registers a + device or driver on the MIC Bus, such as CONFIG_INTEL_MIC_HOST, + CONFIG_INTEL_MIC_CARD, CONFIG_INTEL_MIC_X100_DMA etc. + + If you are building a host/card kernel with an Intel MIC device + then say M (recommended) or Y, else say N. If unsure say N. + + More information about the Intel MIC family as well as the Linux + OS and tools for MIC to use with this driver are available from + <http://software.intel.com/en-us/mic-developer>. + comment "Intel MIC Host Driver" config INTEL_MIC_HOST diff --git a/drivers/misc/mic/Makefile b/drivers/misc/mic/Makefile index 05b34d683a58..e9bf148755e2 100644 --- a/drivers/misc/mic/Makefile +++ b/drivers/misc/mic/Makefile @@ -4,3 +4,4 @@ # obj-$(CONFIG_INTEL_MIC_HOST) += host/ obj-$(CONFIG_INTEL_MIC_CARD) += card/ +obj-$(CONFIG_INTEL_MIC_BUS) += bus/ diff --git a/drivers/misc/mic/bus/Makefile b/drivers/misc/mic/bus/Makefile new file mode 100644 index 000000000000..d85c7f2a0af4 --- /dev/null +++ b/drivers/misc/mic/bus/Makefile @@ -0,0 +1,5 @@ +# +# Makefile - Intel MIC Linux driver. +# Copyright(c) 2014, Intel Corporation. +# +obj-$(CONFIG_INTEL_MIC_BUS) += mic_bus.o diff --git a/drivers/misc/mic/bus/mic_bus.c b/drivers/misc/mic/bus/mic_bus.c new file mode 100644 index 000000000000..961ae90aae47 --- /dev/null +++ b/drivers/misc/mic/bus/mic_bus.c @@ -0,0 +1,218 @@ +/* + * Intel MIC Platform Software Stack (MPSS) + * + * Copyright(c) 2014 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. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + * Intel MIC Bus driver. + * + * This implementation is very similar to the the virtio bus driver + * implementation @ drivers/virtio/virtio.c + */ +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/idr.h> +#include <linux/mic_bus.h> + +/* Unique numbering for mbus devices. */ +static DEFINE_IDA(mbus_index_ida); + +static ssize_t device_show(struct device *d, + struct device_attribute *attr, char *buf) +{ + struct mbus_device *dev = dev_to_mbus(d); + return sprintf(buf, "0x%04x\n", dev->id.device); +} +static DEVICE_ATTR_RO(device); + +static ssize_t vendor_show(struct device *d, + struct device_attribute *attr, char *buf) +{ + struct mbus_device *dev = dev_to_mbus(d); + return sprintf(buf, "0x%04x\n", dev->id.vendor); +} +static DEVICE_ATTR_RO(vendor); + +static ssize_t modalias_show(struct device *d, + struct device_attribute *attr, char *buf) +{ + struct mbus_device *dev = dev_to_mbus(d); + return sprintf(buf, "mbus:d%08Xv%08X\n", + dev->id.device, dev->id.vendor); +} +static DEVICE_ATTR_RO(modalias); + +static struct attribute *mbus_dev_attrs[] = { + &dev_attr_device.attr, + &dev_attr_vendor.attr, + &dev_attr_modalias.attr, + NULL, +}; +ATTRIBUTE_GROUPS(mbus_dev); + +static inline int mbus_id_match(const struct mbus_device *dev, + const struct mbus_device_id *id) +{ + if (id->device != dev->id.device && id->device != MBUS_DEV_ANY_ID) + return 0; + + return id->vendor == MBUS_DEV_ANY_ID || id->vendor == dev->id.vendor; +} + +/* + * This looks through all the IDs a driver claims to support. If any of them + * match, we return 1 and the kernel will call mbus_dev_probe(). + */ +static int mbus_dev_match(struct device *dv, struct device_driver *dr) +{ + unsigned int i; + struct mbus_device *dev = dev_to_mbus(dv); + const struct mbus_device_id *ids; + + ids = drv_to_mbus(dr)->id_table; + for (i = 0; ids[i].device; i++) + if (mbus_id_match(dev, &ids[i])) + return 1; + return 0; +} + +static int mbus_uevent(struct device *dv, struct kobj_uevent_env *env) +{ + struct mbus_device *dev = dev_to_mbus(dv); + + return add_uevent_var(env, "MODALIAS=mbus:d%08Xv%08X", + dev->id.device, dev->id.vendor); +} + +static int mbus_dev_probe(struct device *d) +{ + int err; + struct mbus_device *dev = dev_to_mbus(d); + struct mbus_driver *drv = drv_to_mbus(dev->dev.driver); + + err = drv->probe(dev); + if (!err) + if (drv->scan) + drv->scan(dev); + return err; +} + +static int mbus_dev_remove(struct device *d) +{ + struct mbus_device *dev = dev_to_mbus(d); + struct mbus_driver *drv = drv_to_mbus(dev->dev.driver); + + drv->remove(dev); + return 0; +} + +static struct bus_type mic_bus = { + .name = "mic_bus", + .match = mbus_dev_match, + .dev_groups = mbus_dev_groups, + .uevent = mbus_uevent, + .probe = mbus_dev_probe, + .remove = mbus_dev_remove, +}; + +int mbus_register_driver(struct mbus_driver *driver) +{ + driver->driver.bus = &mic_bus; + return driver_register(&driver->driver); +} +EXPORT_SYMBOL_GPL(mbus_register_driver); + +void mbus_unregister_driver(struct mbus_driver *driver) +{ + driver_unregister(&driver->driver); +} +EXPORT_SYMBOL_GPL(mbus_unregister_driver); + +static void mbus_release_dev(struct device *d) +{ + struct mbus_device *mbdev = dev_to_mbus(d); + kfree(mbdev); +} + +struct mbus_device * +mbus_register_device(struct device *pdev, int id, struct dma_map_ops *dma_ops, + struct mbus_hw_ops *hw_ops, void __iomem *mmio_va) +{ + int ret; + struct mbus_device *mbdev; + + mbdev = kzalloc(sizeof(*mbdev), GFP_KERNEL); + if (!mbdev) + return ERR_PTR(-ENOMEM); + + mbdev->mmio_va = mmio_va; + mbdev->dev.parent = pdev; + mbdev->id.device = id; + mbdev->id.vendor = MBUS_DEV_ANY_ID; + mbdev->dev.archdata.dma_ops = dma_ops; + mbdev->dev.dma_mask = &mbdev->dev.coherent_dma_mask; + dma_set_mask(&mbdev->dev, DMA_BIT_MASK(64)); + mbdev->dev.release = mbus_release_dev; + mbdev->hw_ops = hw_ops; + mbdev->dev.bus = &mic_bus; + + /* Assign a unique device index and hence name. */ + ret = ida_simple_get(&mbus_index_ida, 0, 0, GFP_KERNEL); + if (ret < 0) + goto free_mbdev; + + mbdev->index = ret; + dev_set_name(&mbdev->dev, "mbus-dev%u", mbdev->index); + /* + * device_register() causes the bus infrastructure to look for a + * matching driver. + */ + ret = device_register(&mbdev->dev); + if (ret) + goto ida_remove; + return mbdev; +ida_remove: + ida_simple_remove(&mbus_index_ida, mbdev->index); +free_mbdev: + kfree(mbdev); + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(mbus_register_device); + +void mbus_unregister_device(struct mbus_device *mbdev) +{ + int index = mbdev->index; /* save for after device release */ + + device_unregister(&mbdev->dev); + ida_simple_remove(&mbus_index_ida, index); +} +EXPORT_SYMBOL_GPL(mbus_unregister_device); + +static int __init mbus_init(void) +{ + return bus_register(&mic_bus); +} + +static void __exit mbus_exit(void) +{ + bus_unregister(&mic_bus); + ida_destroy(&mbus_index_ida); +} + +core_initcall(mbus_init); +module_exit(mbus_exit); + +MODULE_AUTHOR("Intel Corporation"); +MODULE_DESCRIPTION("Intel(R) MIC Bus driver"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/mic_bus.h b/include/linux/mic_bus.h new file mode 100644 index 000000000000..d5b5f76d57ef --- /dev/null +++ b/include/linux/mic_bus.h @@ -0,0 +1,110 @@ +/* + * Intel MIC Platform Software Stack (MPSS) + * + * Copyright(c) 2014 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. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + * Intel MIC Bus driver. + * + * This implementation is very similar to the the virtio bus driver + * implementation @ include/linux/virtio.h. + */ +#ifndef _MIC_BUS_H_ +#define _MIC_BUS_H_ +/* + * Everything a mbus driver needs to work with any particular mbus + * implementation. + */ +#include <linux/interrupt.h> +#include <linux/dma-mapping.h> + +struct mbus_device_id { + __u32 device; + __u32 vendor; +}; + +#define MBUS_DEV_DMA_HOST 2 +#define MBUS_DEV_DMA_MIC 3 +#define MBUS_DEV_ANY_ID 0xffffffff + +/** + * mbus_device - representation of a device using mbus + * @mmio_va: virtual address of mmio space + * @hw_ops: the hardware ops supported by this device. + * @id: the device type identification (used to match it with a driver). + * @dev: underlying device. + * be used to communicate with. + * @index: unique position on the mbus bus + */ +struct mbus_device { + void __iomem *mmio_va; + struct mbus_hw_ops *hw_ops; + struct mbus_device_id id; + struct device dev; + int index; +}; + +/** + * mbus_driver - operations for a mbus I/O driver + * @driver: underlying device driver (populate name and owner). + * @id_table: the ids serviced by this driver. + * @probe: the function to call when a device is found. Returns 0 or -errno. + * @remove: the function to call when a device is removed. + */ +struct mbus_driver { + struct device_driver driver; + const struct mbus_device_id *id_table; + int (*probe)(struct mbus_device *dev); + void (*scan)(struct mbus_device *dev); + void (*remove)(struct mbus_device *dev); +}; + +/** + * struct mic_irq - opaque pointer used as cookie + */ +struct mic_irq; + +/** + * mbus_hw_ops - Hardware operations for accessing a MIC device on the MIC bus. + */ +struct mbus_hw_ops { + struct mic_irq* (*request_threaded_irq)(struct mbus_device *mbdev, + irq_handler_t handler, + irq_handler_t thread_fn, + const char *name, void *data, + int intr_src); + void (*free_irq)(struct mbus_device *mbdev, + struct mic_irq *cookie, void *data); + void (*ack_interrupt)(struct mbus_device *mbdev, int num); +}; + +struct mbus_device * +mbus_register_device(struct device *pdev, int id, struct dma_map_ops *dma_ops, + struct mbus_hw_ops *hw_ops, void __iomem *mmio_va); +void mbus_unregister_device(struct mbus_device *mbdev); + +int mbus_register_driver(struct mbus_driver *drv); +void mbus_unregister_driver(struct mbus_driver *drv); + +static inline struct mbus_device *dev_to_mbus(struct device *_dev) +{ + return container_of(_dev, struct mbus_device, dev); +} + +static inline struct mbus_driver *drv_to_mbus(struct device_driver *drv) +{ + return container_of(drv, struct mbus_driver, driver); +} + +#endif /* _MIC_BUS_H */ |