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 int (*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
vio_enable_interrupts(struct vio_dev * dev)152 static inline int vio_enable_interrupts(struct vio_dev *dev)
153 {
154 return 0;
155 }
156 #endif
157
to_vio_driver(struct device_driver * drv)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
to_vio_dev(struct device * dev)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 */
170