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 const 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 void (*shutdown)(struct vio_dev *dev); 118 /* A driver must have a get_desired_dma() function to 119 * be loaded in a CMO environment if it uses DMA. 120 */ 121 unsigned long (*get_desired_dma)(struct vio_dev *dev); 122 const struct dev_pm_ops *pm; 123 struct device_driver driver; 124 }; 125 126 extern int __vio_register_driver(struct vio_driver *drv, struct module *owner, 127 const char *mod_name); 128 /* 129 * vio_register_driver must be a macro so that KBUILD_MODNAME can be expanded 130 */ 131 #define vio_register_driver(driver) \ 132 __vio_register_driver(driver, THIS_MODULE, KBUILD_MODNAME) 133 extern void vio_unregister_driver(struct vio_driver *drv); 134 135 extern int vio_cmo_entitlement_update(size_t); 136 extern void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired); 137 138 extern void vio_unregister_device(struct vio_dev *dev); 139 140 extern int vio_h_cop_sync(struct vio_dev *vdev, struct vio_pfo_op *op); 141 142 struct device_node; 143 144 extern struct vio_dev *vio_register_device_node( 145 struct device_node *node_vdev); 146 extern const void *vio_get_attribute(struct vio_dev *vdev, char *which, 147 int *length); 148 #ifdef CONFIG_PPC_PSERIES 149 extern struct vio_dev *vio_find_node(struct device_node *vnode); 150 extern int vio_enable_interrupts(struct vio_dev *dev); 151 extern int vio_disable_interrupts(struct vio_dev *dev); 152 #else 153 static inline int vio_enable_interrupts(struct vio_dev *dev) 154 { 155 return 0; 156 } 157 #endif 158 159 static inline struct vio_driver *to_vio_driver(struct device_driver *drv) 160 { 161 return container_of(drv, struct vio_driver, driver); 162 } 163 164 #define to_vio_dev(__dev) container_of_const(__dev, struct vio_dev, dev) 165 166 #endif /* __KERNEL__ */ 167 #endif /* _ASM_POWERPC_VIO_H */ 168