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Linux/arch/powerpc/include/asm/vio.h

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  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/errno.h>
 19 #include <linux/device.h>
 20 #include <linux/dma-mapping.h>
 21 #include <linux/mod_devicetable.h>
 22 #include <linux/scatterlist.h>
 23 
 24 #include <asm/hvcall.h>
 25 
 26 /*
 27  * Architecture-specific constants for drivers to
 28  * extract attributes of the device using vio_get_attribute()
 29  */
 30 #define VETH_MAC_ADDR "local-mac-address"
 31 #define VETH_MCAST_FILTER_SIZE "ibm,mac-address-filters"
 32 
 33 /* End architecture-specific constants */
 34 
 35 #define h_vio_signal(ua, mode) \
 36   plpar_hcall_norets(H_VIO_SIGNAL, ua, mode)
 37 
 38 #define VIO_IRQ_DISABLE         0UL
 39 #define VIO_IRQ_ENABLE          1UL
 40 
 41 /*
 42  * VIO CMO minimum entitlement for all devices and spare entitlement
 43  */
 44 #define VIO_CMO_MIN_ENT 1562624
 45 
 46 extern struct bus_type vio_bus_type;
 47 
 48 struct iommu_table;
 49 
 50 /*
 51  * Platform Facilities Option (PFO)-specific data
 52  */
 53 
 54 /* Starting unit address for PFO devices on the VIO BUS */
 55 #define VIO_BASE_PFO_UA 0x50000000
 56 
 57 /**
 58  * vio_pfo_op - PFO operation parameters
 59  *
 60  * @flags: h_call subfunctions and modifiers
 61  * @in: Input data block logical real address
 62  * @inlen: If non-negative, the length of the input data block.  If negative,
 63  *      the length of the input data descriptor list in bytes.
 64  * @out: Output data block logical real address
 65  * @outlen: If non-negative, the length of the input data block.  If negative,
 66  *      the length of the input data descriptor list in bytes.
 67  * @csbcpb: Logical real address of the 4k naturally-aligned storage block
 68  *      containing the CSB & optional FC field specific CPB
 69  * @timeout: # of milliseconds to retry h_call, 0 for no timeout.
 70  * @hcall_err: pointer to return the h_call return value, else NULL
 71  */
 72 struct vio_pfo_op {
 73         u64 flags;
 74         s64 in;
 75         s64 inlen;
 76         s64 out;
 77         s64 outlen;
 78         u64 csbcpb;
 79         void *done;
 80         unsigned long handle;
 81         unsigned int timeout;
 82         long hcall_err;
 83 };
 84 
 85 /* End PFO specific data */
 86 
 87 enum vio_dev_family {
 88         VDEVICE,        /* The OF node is a child of /vdevice */
 89         PFO,            /* The OF node is a child of /ibm,platform-facilities */
 90 };
 91 
 92 /**
 93  * vio_dev - This structure is used to describe virtual I/O devices.
 94  *
 95  * @desired: set from return of driver's get_desired_dma() function
 96  * @entitled: bytes of IO data that has been reserved for this device.
 97  * @allocated: bytes of IO data currently in use by the device.
 98  * @allocs_failed: number of DMA failures due to insufficient entitlement.
 99  */
100 struct vio_dev {
101         const char *name;
102         const char *type;
103         uint32_t unit_address;
104         uint32_t resource_id;
105         unsigned int irq;
106         struct {
107                 size_t desired;
108                 size_t entitled;
109                 size_t allocated;
110                 atomic_t allocs_failed;
111         } cmo;
112         enum vio_dev_family family;
113         struct device dev;
114 };
115 
116 struct vio_driver {
117         const char *name;
118         const struct vio_device_id *id_table;
119         int (*probe)(struct vio_dev *dev, const struct vio_device_id *id);
120         int (*remove)(struct vio_dev *dev);
121         /* A driver must have a get_desired_dma() function to
122          * be loaded in a CMO environment if it uses DMA.
123          */
124         unsigned long (*get_desired_dma)(struct vio_dev *dev);
125         const struct dev_pm_ops *pm;
126         struct device_driver driver;
127 };
128 
129 extern int __vio_register_driver(struct vio_driver *drv, struct module *owner,
130                                  const char *mod_name);
131 /*
132  * vio_register_driver must be a macro so that KBUILD_MODNAME can be expanded
133  */
134 #define vio_register_driver(driver)             \
135         __vio_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)
136 extern void vio_unregister_driver(struct vio_driver *drv);
137 
138 extern int vio_cmo_entitlement_update(size_t);
139 extern void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired);
140 
141 extern void vio_unregister_device(struct vio_dev *dev);
142 
143 extern int vio_h_cop_sync(struct vio_dev *vdev, struct vio_pfo_op *op);
144 
145 struct device_node;
146 
147 extern struct vio_dev *vio_register_device_node(
148                 struct device_node *node_vdev);
149 extern const void *vio_get_attribute(struct vio_dev *vdev, char *which,
150                 int *length);
151 #ifdef CONFIG_PPC_PSERIES
152 extern struct vio_dev *vio_find_node(struct device_node *vnode);
153 extern int vio_enable_interrupts(struct vio_dev *dev);
154 extern int vio_disable_interrupts(struct vio_dev *dev);
155 #else
156 static inline int vio_enable_interrupts(struct vio_dev *dev)
157 {
158         return 0;
159 }
160 #endif
161 
162 static inline struct vio_driver *to_vio_driver(struct device_driver *drv)
163 {
164         return container_of(drv, struct vio_driver, driver);
165 }
166 
167 static inline struct vio_dev *to_vio_dev(struct device *dev)
168 {
169         return container_of(dev, struct vio_dev, dev);
170 }
171 
172 #endif /* __KERNEL__ */
173 #endif /* _ASM_POWERPC_VIO_H */
174 

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