LXR linux/arch/powerpc/include/asm/vio.h

   1/*
   2 * IBM PowerPC Virtual I/O Infrastructure Support.
   3 *
   4 * Copyright (c) 2003 IBM Corp.
   5 *  Dave Engebretsen engebret@us.ibm.com
   6 *  Santiago Leon santil@us.ibm.com
   7 *
   8 * This program is free software; you can redistribute it and/or
   9 * modify it under the terms of the GNU General Public License
  10 * as published by the Free Software Foundation; either version
  11 * 2 of the License, or (at your option) any later version.
  12 */
  13
  14#ifndef _ASM_POWERPC_VIO_H
  15#define _ASM_POWERPC_VIO_H
  16#ifdef __KERNEL__
  17
  18#include <linux/init.h>
  19#include <linux/errno.h>
  20#include <linux/device.h>
  21#include <linux/dma-mapping.h>
  22#include <linux/mod_devicetable.h>
  23
  24#include <asm/hvcall.h>
  25#include <asm/scatterlist.h>
  26
  27/*
  28 * Architecture-specific constants for drivers to
  29 * extract attributes of the device using vio_get_attribute()
  30 */
  31#define VETH_MAC_ADDR "local-mac-address"
  32#define VETH_MCAST_FILTER_SIZE "ibm,mac-address-filters"
  33
  34/* End architecture-specific constants */
  35
  36#define h_vio_signal(ua, mode) \
  37  plpar_hcall_norets(H_VIO_SIGNAL, ua, mode)
  38
  39#define VIO_IRQ_DISABLE         0UL
  40#define VIO_IRQ_ENABLE          1UL
  41
  42/*
  43 * VIO CMO minimum entitlement for all devices and spare entitlement
  44 */
  45#define VIO_CMO_MIN_ENT 1562624
  46
  47struct iommu_table;
  48
  49/**
  50 * vio_dev - This structure is used to describe virtual I/O devices.
  51 *
  52 * @desired: set from return of driver's get_desired_dma() function
  53 * @entitled: bytes of IO data that has been reserved for this device.
  54 * @allocated: bytes of IO data currently in use by the device.
  55 * @allocs_failed: number of DMA failures due to insufficient entitlement.
  56 */
  57struct vio_dev {
  58        const char *name;
  59        const char *type;
  60        uint32_t unit_address;
  61        unsigned int irq;
  62        struct {
  63                size_t desired;
  64                size_t entitled;
  65                size_t allocated;
  66                atomic_t allocs_failed;
  67        } cmo;
  68        struct device dev;
  69};
  70
  71struct vio_driver {
  72        const struct vio_device_id *id_table;
  73        int (*probe)(struct vio_dev *dev, const struct vio_device_id *id);
  74        int (*remove)(struct vio_dev *dev);
  75        /* A driver must have a get_desired_dma() function to
  76         * be loaded in a CMO environment if it uses DMA.
  77         */
  78        unsigned long (*get_desired_dma)(struct vio_dev *dev);
  79        struct device_driver driver;
  80};
  81
  82extern int vio_register_driver(struct vio_driver *drv);
  83extern void vio_unregister_driver(struct vio_driver *drv);
  84
  85extern int vio_cmo_entitlement_update(size_t);
  86extern void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired);
  87
  88extern void __devinit vio_unregister_device(struct vio_dev *dev);
  89
  90struct device_node;
  91
  92extern struct vio_dev *vio_register_device_node(
  93                struct device_node *node_vdev);
  94extern const void *vio_get_attribute(struct vio_dev *vdev, char *which,
  95                int *length);
  96#ifdef CONFIG_PPC_PSERIES
  97extern struct vio_dev *vio_find_node(struct device_node *vnode);
  98extern int vio_enable_interrupts(struct vio_dev *dev);
  99extern int vio_disable_interrupts(struct vio_dev *dev);
 100#else
 101static inline int vio_enable_interrupts(struct vio_dev *dev)
 102{
 103        return 0;
 104}
 105#endif
 106
 107static inline struct vio_driver *to_vio_driver(struct device_driver *drv)
 108{
 109        return container_of(drv, struct vio_driver, driver);
 110}
 111
 112static inline struct vio_dev *to_vio_dev(struct device *dev)
 113{
 114        return container_of(dev, struct vio_dev, dev);
 115}
 116
 117#endif /* __KERNEL__ */
 118#endif /* _ASM_POWERPC_VIO_H */
 119