arch/powerpc/include/asm/vio.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * IBM PowerPC Virtual I/O Infrastructure Support.
   4  *
   5  * Copyright (c) 2003 IBM Corp.
   6  *  Dave Engebretsen engebret@us.ibm.com
   7  *  Santiago Leon santil@us.ibm.com
   8  */
   9
  10 #ifndef _ASM_POWERPC_VIO_H
  11 #define _ASM_POWERPC_VIO_H
  12 #ifdef __KERNEL__
  13
  14 #include <linux/errno.h>
  15 #include <linux/device.h>
  16 #include <linux/dma-mapping.h>
  17 #include <linux/mod_devicetable.h>
  18 #include <linux/scatterlist.h>
  19
  20 #include <asm/hvcall.h>
  21
  22 /*
  23  * Architecture-specific constants for drivers to
  24  * extract attributes of the device using vio_get_attribute()
  25  */
  26 #define VETH_MAC_ADDR "local-mac-address"
  27 #define VETH_MCAST_FILTER_SIZE "ibm,mac-address-filters"
  28
  29 /* End architecture-specific constants */
  30
  31 #define h_vio_signal(ua, mode) \
  32   plpar_hcall_norets(H_VIO_SIGNAL, ua, mode)
  33
  34 #define VIO_IRQ_DISABLE         0UL
  35 #define VIO_IRQ_ENABLE          1UL
  36
  37 /*
  38  * VIO CMO minimum entitlement for all devices and spare entitlement
  39  */
  40 #define VIO_CMO_MIN_ENT 1562624
  41
  42 extern struct bus_type vio_bus_type;
  43
  44 struct iommu_table;
  45
  46 /*
  47  * Platform Facilities Option (PFO)-specific data
  48  */
  49
  50 /* Starting unit address for PFO devices on the VIO BUS */
  51 #define VIO_BASE_PFO_UA 0x50000000
  52
  53 /**
  54  * vio_pfo_op - PFO operation parameters
  55  *
  56  * @flags: h_call subfunctions and modifiers
  57  * @in: Input data block logical real address
  58  * @inlen: If non-negative, the length of the input data block.  If negative,
  59  *      the length of the input data descriptor list in bytes.
  60  * @out: Output data block logical real address
  61  * @outlen: If non-negative, the length of the input data block.  If negative,
  62  *      the length of the input data descriptor list in bytes.
  63  * @csbcpb: Logical real address of the 4k naturally-aligned storage block
  64  *      containing the CSB & optional FC field specific CPB
  65  * @timeout: # of milliseconds to retry h_call, 0 for no timeout.
  66  * @hcall_err: pointer to return the h_call return value, else NULL
  67  */
  68 struct vio_pfo_op {
  69         u64 flags;
  70         s64 in;
  71         s64 inlen;
  72         s64 out;
  73         s64 outlen;
  74         u64 csbcpb;
  75         void *done;
  76         unsigned long handle;
  77         unsigned int timeout;
  78         long hcall_err;
  79 };
  80
  81 /* End PFO specific data */
  82
  83 enum vio_dev_family {
  84         VDEVICE,        /* The OF node is a child of /vdevice */
  85         PFO,            /* The OF node is a child of /ibm,platform-facilities */
  86 };
  87
  88 /**
  89  * vio_dev - This structure is used to describe virtual I/O devices.
  90  *
  91  * @desired: set from return of driver's get_desired_dma() function
  92  * @entitled: bytes of IO data that has been reserved for this device.
  93  * @allocated: bytes of IO data currently in use by the device.
  94  * @allocs_failed: number of DMA failures due to insufficient entitlement.
  95  */
  96 struct vio_dev {
  97         const char *name;
  98         const char *type;
  99         uint32_t unit_address;
 100         uint32_t resource_id;
 101         unsigned int irq;
 102         struct {
 103                 size_t desired;
 104                 size_t entitled;
 105                 size_t allocated;
 106                 atomic_t allocs_failed;
 107         } cmo;
 108         enum vio_dev_family family;
 109         struct device dev;
 110 };
 111
 112 struct vio_driver {
 113         const char *name;
 114         const struct vio_device_id *id_table;
 115         int (*probe)(struct vio_dev *dev, const struct vio_device_id *id);
 116         void (*remove)(struct vio_dev *dev);
 117         /* A driver must have a get_desired_dma() function to
 118          * be loaded in a CMO environment if it uses DMA.
 119          */
 120         unsigned long (*get_desired_dma)(struct vio_dev *dev);
 121         const struct dev_pm_ops *pm;
 122         struct device_driver driver;
 123 };
 124
 125 extern int __vio_register_driver(struct vio_driver *drv, struct module *owner,
 126                                  const char *mod_name);
 127 /*
 128  * vio_register_driver must be a macro so that KBUILD_MODNAME can be expanded
 129  */
 130 #define vio_register_driver(driver)             \
 131         __vio_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)
 132 extern void vio_unregister_driver(struct vio_driver *drv);
 133
 134 extern int vio_cmo_entitlement_update(size_t);
 135 extern void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired);
 136
 137 extern void vio_unregister_device(struct vio_dev *dev);
 138
 139 extern int vio_h_cop_sync(struct vio_dev *vdev, struct vio_pfo_op *op);
 140
 141 struct device_node;
 142
 143 extern struct vio_dev *vio_register_device_node(
 144                 struct device_node *node_vdev);
 145 extern const void *vio_get_attribute(struct vio_dev *vdev, char *which,
 146                 int *length);
 147 #ifdef CONFIG_PPC_PSERIES
 148 extern struct vio_dev *vio_find_node(struct device_node *vnode);
 149 extern int vio_enable_interrupts(struct vio_dev *dev);
 150 extern int vio_disable_interrupts(struct vio_dev *dev);
 151 #else
 152 static inline int vio_enable_interrupts(struct vio_dev *dev)
 153 {
 154         return 0;
 155 }
 156 #endif
 157
 158 static inline struct vio_driver *to_vio_driver(struct device_driver *drv)
 159 {
 160         return container_of(drv, struct vio_driver, driver);
 161 }
 162
 163 static inline struct vio_dev *to_vio_dev(struct device *dev)
 164 {
 165         return container_of(dev, struct vio_dev, dev);
 166 }
 167
 168 #endif /* __KERNEL__ */
 169 #endif /* _ASM_POWERPC_VIO_H */