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
  47 struct 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  */
  57 struct 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
  71 struct 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
  82 extern int vio_register_driver(struct vio_driver *drv);
  83 extern void vio_unregister_driver(struct vio_driver *drv);
  84
  85 extern int vio_cmo_entitlement_update(size_t);
  86 extern void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired);
  87
  88 extern void __devinit vio_unregister_device(struct vio_dev *dev);
  89
  90 struct device_node;
  91
  92 extern struct vio_dev *vio_register_device_node(
  93                 struct device_node *node_vdev);
  94 extern const void *vio_get_attribute(struct vio_dev *vdev, char *which,
  95                 int *length);
  96 #ifdef CONFIG_PPC_PSERIES
  97 extern struct vio_dev *vio_find_node(struct device_node *vnode);
  98 extern int vio_enable_interrupts(struct vio_dev *dev);
  99 extern int vio_disable_interrupts(struct vio_dev *dev);
 100 #else
 101 static inline int vio_enable_interrupts(struct vio_dev *dev)
 102 {
 103         return 0;
 104 }
 105 #endif
 106
 107 static inline struct vio_driver *to_vio_driver(struct device_driver *drv)
 108 {
 109         return container_of(drv, struct vio_driver, driver);
 110 }
 111
 112 static 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 */