linux/arch/powerpc/include/asm/vio.h
Kent Yoder f2ab621996 powerpc/pseries: Add PFO support to the VIO bus
Add support for the Platform Facilities Option (PFO) to the VIO bus.
These devices have a separate root node in OpenFirmware which
requires additional parsing to map into the existing VIO device
structure fields. This adds the interface for PFO device drivers to
make synchronous hypervisor calls.

Signed-off-by: Robert Jennings <rcj@linux.vnet.ibm.com>
Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2012-05-14 10:49:09 +10:00

173 lines
4.8 KiB
C

/*
* IBM PowerPC Virtual I/O Infrastructure Support.
*
* Copyright (c) 2003 IBM Corp.
* Dave Engebretsen engebret@us.ibm.com
* Santiago Leon santil@us.ibm.com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#ifndef _ASM_POWERPC_VIO_H
#define _ASM_POWERPC_VIO_H
#ifdef __KERNEL__
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/mod_devicetable.h>
#include <asm/hvcall.h>
#include <asm/scatterlist.h>
/*
* Architecture-specific constants for drivers to
* extract attributes of the device using vio_get_attribute()
*/
#define VETH_MAC_ADDR "local-mac-address"
#define VETH_MCAST_FILTER_SIZE "ibm,mac-address-filters"
/* End architecture-specific constants */
#define h_vio_signal(ua, mode) \
plpar_hcall_norets(H_VIO_SIGNAL, ua, mode)
#define VIO_IRQ_DISABLE 0UL
#define VIO_IRQ_ENABLE 1UL
/*
* VIO CMO minimum entitlement for all devices and spare entitlement
*/
#define VIO_CMO_MIN_ENT 1562624
struct iommu_table;
/*
* Platform Facilities Option (PFO)-specific data
*/
/* Starting unit address for PFO devices on the VIO BUS */
#define VIO_BASE_PFO_UA 0x50000000
/**
* vio_pfo_op - PFO operation parameters
*
* @flags: h_call subfunctions and modifiers
* @in: Input data block logical real address
* @inlen: If non-negative, the length of the input data block. If negative,
* the length of the input data descriptor list in bytes.
* @out: Output data block logical real address
* @outlen: If non-negative, the length of the input data block. If negative,
* the length of the input data descriptor list in bytes.
* @csbcpb: Logical real address of the 4k naturally-aligned storage block
* containing the CSB & optional FC field specific CPB
* @timeout: # of milliseconds to retry h_call, 0 for no timeout.
* @hcall_err: pointer to return the h_call return value, else NULL
*/
struct vio_pfo_op {
u64 flags;
s64 in;
s64 inlen;
s64 out;
s64 outlen;
u64 csbcpb;
void *done;
unsigned long handle;
unsigned int timeout;
long hcall_err;
};
/* End PFO specific data */
enum vio_dev_family {
VDEVICE, /* The OF node is a child of /vdevice */
PFO, /* The OF node is a child of /ibm,platform-facilities */
};
/**
* vio_dev - This structure is used to describe virtual I/O devices.
*
* @desired: set from return of driver's get_desired_dma() function
* @entitled: bytes of IO data that has been reserved for this device.
* @allocated: bytes of IO data currently in use by the device.
* @allocs_failed: number of DMA failures due to insufficient entitlement.
*/
struct vio_dev {
const char *name;
const char *type;
uint32_t unit_address;
uint32_t resource_id;
unsigned int irq;
struct {
size_t desired;
size_t entitled;
size_t allocated;
atomic_t allocs_failed;
} cmo;
enum vio_dev_family family;
struct device dev;
};
struct vio_driver {
const char *name;
const struct vio_device_id *id_table;
int (*probe)(struct vio_dev *dev, const struct vio_device_id *id);
int (*remove)(struct vio_dev *dev);
/* A driver must have a get_desired_dma() function to
* be loaded in a CMO environment if it uses DMA.
*/
unsigned long (*get_desired_dma)(struct vio_dev *dev);
const struct dev_pm_ops *pm;
struct device_driver driver;
};
extern int __vio_register_driver(struct vio_driver *drv, struct module *owner,
const char *mod_name);
/*
* vio_register_driver must be a macro so that KBUILD_MODNAME can be expanded
*/
#define vio_register_driver(driver) \
__vio_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)
extern void vio_unregister_driver(struct vio_driver *drv);
extern int vio_cmo_entitlement_update(size_t);
extern void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired);
extern void __devinit vio_unregister_device(struct vio_dev *dev);
extern int vio_h_cop_sync(struct vio_dev *vdev, struct vio_pfo_op *op);
struct device_node;
extern struct vio_dev *vio_register_device_node(
struct device_node *node_vdev);
extern const void *vio_get_attribute(struct vio_dev *vdev, char *which,
int *length);
#ifdef CONFIG_PPC_PSERIES
extern struct vio_dev *vio_find_node(struct device_node *vnode);
extern int vio_enable_interrupts(struct vio_dev *dev);
extern int vio_disable_interrupts(struct vio_dev *dev);
#else
static inline int vio_enable_interrupts(struct vio_dev *dev)
{
return 0;
}
#endif
static inline struct vio_driver *to_vio_driver(struct device_driver *drv)
{
return container_of(drv, struct vio_driver, driver);
}
static inline struct vio_dev *to_vio_dev(struct device *dev)
{
return container_of(dev, struct vio_dev, dev);
}
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_VIO_H */