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2d8784df1a
When performing DMA operations on a MCB device, the device needed for using the DMA API is "mcb_device->bus_carrier". This is rather lengthy, so a shortcut is introduced to struct mcb_device in order to ensure the MCB device driver uses the correct device for DMA operations. Signed-off-by: Michael Moese <michael.moese@men.de> Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
141 lines
3.8 KiB
C
141 lines
3.8 KiB
C
/*
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* MEN Chameleon Bus.
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*
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* Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
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* Author: Johannes Thumshirn <johannes.thumshirn@men.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; version 2 of the License.
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*/
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#ifndef _LINUX_MCB_H
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#define _LINUX_MCB_H
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#include <linux/mod_devicetable.h>
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#include <linux/device.h>
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#include <linux/irqreturn.h>
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#define CHAMELEON_FILENAME_LEN 12
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struct mcb_driver;
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struct mcb_device;
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/**
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* struct mcb_bus - MEN Chameleon Bus
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*
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* @dev: bus device
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* @carrier: pointer to carrier device
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* @bus_nr: mcb bus number
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* @get_irq: callback to get IRQ number
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* @revision: the FPGA's revision number
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* @model: the FPGA's model number
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* @filename: the FPGA's name
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*/
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struct mcb_bus {
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struct device dev;
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struct device *carrier;
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int bus_nr;
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u8 revision;
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char model;
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u8 minor;
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char name[CHAMELEON_FILENAME_LEN + 1];
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int (*get_irq)(struct mcb_device *dev);
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};
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static inline struct mcb_bus *to_mcb_bus(struct device *dev)
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{
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return container_of(dev, struct mcb_bus, dev);
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}
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/**
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* struct mcb_device - MEN Chameleon Bus device
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*
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* @dev: device in kernel representation
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* @bus: mcb bus the device is plugged to
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* @is_added: flag to check if device is added to bus
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* @driver: associated mcb_driver
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* @id: mcb device id
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* @inst: instance in Chameleon table
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* @group: group in Chameleon table
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* @var: variant in Chameleon table
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* @bar: BAR in Chameleon table
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* @rev: revision in Chameleon table
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* @irq: IRQ resource
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* @memory: memory resource
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*/
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struct mcb_device {
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struct device dev;
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struct mcb_bus *bus;
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bool is_added;
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struct mcb_driver *driver;
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u16 id;
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int inst;
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int group;
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int var;
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int bar;
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int rev;
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struct resource irq;
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struct resource mem;
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struct device *dma_dev;
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};
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static inline struct mcb_device *to_mcb_device(struct device *dev)
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{
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return container_of(dev, struct mcb_device, dev);
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}
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/**
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* struct mcb_driver - MEN Chameleon Bus device driver
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*
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* @driver: device_driver
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* @id_table: mcb id table
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* @probe: probe callback
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* @remove: remove callback
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* @shutdown: shutdown callback
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*/
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struct mcb_driver {
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struct device_driver driver;
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const struct mcb_device_id *id_table;
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int (*probe)(struct mcb_device *mdev, const struct mcb_device_id *id);
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void (*remove)(struct mcb_device *mdev);
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void (*shutdown)(struct mcb_device *mdev);
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};
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static inline struct mcb_driver *to_mcb_driver(struct device_driver *drv)
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{
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return container_of(drv, struct mcb_driver, driver);
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}
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static inline void *mcb_get_drvdata(struct mcb_device *dev)
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{
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return dev_get_drvdata(&dev->dev);
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}
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static inline void mcb_set_drvdata(struct mcb_device *dev, void *data)
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{
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dev_set_drvdata(&dev->dev, data);
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}
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extern int __must_check __mcb_register_driver(struct mcb_driver *drv,
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struct module *owner,
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const char *mod_name);
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#define mcb_register_driver(driver) \
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__mcb_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)
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extern void mcb_unregister_driver(struct mcb_driver *driver);
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#define module_mcb_driver(__mcb_driver) \
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module_driver(__mcb_driver, mcb_register_driver, mcb_unregister_driver);
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extern void mcb_bus_add_devices(const struct mcb_bus *bus);
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extern int mcb_device_register(struct mcb_bus *bus, struct mcb_device *dev);
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extern struct mcb_bus *mcb_alloc_bus(struct device *carrier);
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extern struct mcb_bus *mcb_bus_get(struct mcb_bus *bus);
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extern void mcb_bus_put(struct mcb_bus *bus);
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extern struct mcb_device *mcb_alloc_dev(struct mcb_bus *bus);
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extern void mcb_free_dev(struct mcb_device *dev);
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extern void mcb_release_bus(struct mcb_bus *bus);
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extern struct resource *mcb_request_mem(struct mcb_device *dev,
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const char *name);
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extern void mcb_release_mem(struct resource *mem);
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extern int mcb_get_irq(struct mcb_device *dev);
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#endif /* _LINUX_MCB_H */
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