lib/pci-edu.h

/*
 * Edu PCI device header.
 *
 * Copyright (C) 2016 Red Hat, Inc.
 *
 * Authors:
 *   Peter Xu <peterx@redhat.com>,
 *
 * This work is licensed under the terms of the GNU LGPL, version 2 or
 * later.
 *
 * Edu device is a virtualized device in QEMU. Please refer to
 * docs/specs/edu.txt in QEMU repository for EDU device manual.
 */
#ifndef _PCI_EDU_H_
#define _PCI_EDU_H_

#include "pci.h"
#include "asm/io.h"

#define  PCI_VENDOR_ID_QEMU              0x1234
#define  PCI_DEVICE_ID_EDU               0x11e8

/* The only bar used by EDU device */
#define EDU_BAR                     0
#define EDU_MAGIC                   0xed
#define EDU_VERSION                 0x100
#define EDU_DMA_BUF_SIZE            (1 << 20)
#define EDU_INPUT_BUF_SIZE          256

#define EDU_REG_ID                  0x0
#define EDU_REG_ALIVE               0x4
#define EDU_REG_FACTORIAL           0x8
#define EDU_REG_STATUS              0x20
#define EDU_REG_INTR_STATUS         0x24
#define EDU_REG_INTR_RAISE          0x60
#define EDU_REG_INTR_ACK            0x64
#define EDU_REG_DMA_SRC             0x80
#define EDU_REG_DMA_DST             0x88
#define EDU_REG_DMA_COUNT           0x90
#define EDU_REG_DMA_CMD             0x98

#define EDU_CMD_DMA_START           0x01
#define EDU_CMD_DMA_FROM            0x02
#define EDU_CMD_DMA_TO              0x00

#define EDU_STATUS_FACTORIAL        0x1
#define EDU_STATUS_INT_ENABLE       0x80

#define EDU_DMA_START               0x40000
#define EDU_DMA_SIZE_MAX            4096

struct pci_edu_dev {
	struct pci_dev pci_dev;
	volatile void *reg_base;
};

#define edu_reg(d, r) (volatile void *)((d)->reg_base + (r))

static inline uint64_t edu_reg_readq(struct pci_edu_dev *dev, int reg)
{
	return __raw_readq(edu_reg(dev, reg));
}

static inline uint32_t edu_reg_readl(struct pci_edu_dev *dev, int reg)
{
	return __raw_readl(edu_reg(dev, reg));
}

static inline void edu_reg_writeq(struct pci_edu_dev *dev, int reg,
				  uint64_t val)
{
	__raw_writeq(val, edu_reg(dev, reg));
}

static inline void edu_reg_writel(struct pci_edu_dev *dev, int reg,
				  uint32_t val)
{
	__raw_writel(val, edu_reg(dev, reg));
}

bool edu_init(struct pci_edu_dev *dev);
void edu_dma(struct pci_edu_dev *dev, iova_t iova,
	     size_t size, unsigned int dev_offset, bool from_device);

#endif