fdc4aca89e
VirtIO can use various different buses and virtio devices are commonly implemented as PCI devices. But virtual environments without PCI support (a common situation in embedded devices models) might use simple memory mapped device (“virtio-mmio”) instead of the PCI device. This adds a transport driver that implements UCLASS_VIRTIO for virtio over mmio. Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi> Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
130 lines
3.4 KiB
C
130 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (C) 2018, Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
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* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
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*
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* From Linux kernel include/uapi/linux/virtio_mmio.h
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*/
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#ifndef _LINUX_VIRTIO_MMIO_H
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#define _LINUX_VIRTIO_MMIO_H
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/* Control registers */
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/* Magic value ("virt" string) - Read Only */
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#define VIRTIO_MMIO_MAGIC_VALUE 0x000
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/* Virtio device version - Read Only */
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#define VIRTIO_MMIO_VERSION 0x004
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/* Virtio device ID - Read Only */
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#define VIRTIO_MMIO_DEVICE_ID 0x008
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/* Virtio vendor ID - Read Only */
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#define VIRTIO_MMIO_VENDOR_ID 0x00c
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/*
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* Bitmask of the features supported by the device (host)
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* (32 bits per set) - Read Only
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*/
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#define VIRTIO_MMIO_DEVICE_FEATURES 0x010
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/* Device (host) features set selector - Write Only */
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#define VIRTIO_MMIO_DEVICE_FEATURES_SEL 0x014
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/*
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* Bitmask of features activated by the driver (guest)
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* (32 bits per set) - Write Only
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*/
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#define VIRTIO_MMIO_DRIVER_FEATURES 0x020
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/* Activated features set selector - Write Only */
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#define VIRTIO_MMIO_DRIVER_FEATURES_SEL 0x024
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#ifndef VIRTIO_MMIO_NO_LEGACY /* LEGACY DEVICES ONLY! */
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/* Guest's memory page size in bytes - Write Only */
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#define VIRTIO_MMIO_GUEST_PAGE_SIZE 0x028
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#endif
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/* Queue selector - Write Only */
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#define VIRTIO_MMIO_QUEUE_SEL 0x030
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/* Maximum size of the currently selected queue - Read Only */
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#define VIRTIO_MMIO_QUEUE_NUM_MAX 0x034
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/* Queue size for the currently selected queue - Write Only */
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#define VIRTIO_MMIO_QUEUE_NUM 0x038
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#ifndef VIRTIO_MMIO_NO_LEGACY /* LEGACY DEVICES ONLY! */
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/* Used Ring alignment for the currently selected queue - Write Only */
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#define VIRTIO_MMIO_QUEUE_ALIGN 0x03c
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/* Guest's PFN for the currently selected queue - Read Write */
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#define VIRTIO_MMIO_QUEUE_PFN 0x040
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#endif
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/* Ready bit for the currently selected queue - Read Write */
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#define VIRTIO_MMIO_QUEUE_READY 0x044
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/* Queue notifier - Write Only */
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#define VIRTIO_MMIO_QUEUE_NOTIFY 0x050
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/* Interrupt status - Read Only */
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#define VIRTIO_MMIO_INTERRUPT_STATUS 0x060
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/* Interrupt acknowledge - Write Only */
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#define VIRTIO_MMIO_INTERRUPT_ACK 0x064
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/* Device status register - Read Write */
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#define VIRTIO_MMIO_STATUS 0x070
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/* Selected queue's Descriptor Table address, 64 bits in two halves */
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#define VIRTIO_MMIO_QUEUE_DESC_LOW 0x080
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#define VIRTIO_MMIO_QUEUE_DESC_HIGH 0x084
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/* Selected queue's Available Ring address, 64 bits in two halves */
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#define VIRTIO_MMIO_QUEUE_AVAIL_LOW 0x090
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#define VIRTIO_MMIO_QUEUE_AVAIL_HIGH 0x094
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/* Selected queue's Used Ring address, 64 bits in two halves */
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#define VIRTIO_MMIO_QUEUE_USED_LOW 0x0a0
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#define VIRTIO_MMIO_QUEUE_USED_HIGH 0x0a4
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/* Configuration atomicity value */
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#define VIRTIO_MMIO_CONFIG_GENERATION 0x0fc
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/*
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* The config space is defined by each driver as
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* the per-driver configuration space - Read Write
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*/
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#define VIRTIO_MMIO_CONFIG 0x100
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/* Interrupt flags (re: interrupt status & acknowledge registers) */
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#define VIRTIO_MMIO_INT_VRING BIT(0)
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#define VIRTIO_MMIO_INT_CONFIG BIT(1)
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/*
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* The alignment to use between consumer and producer parts of vring.
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* Currently hardcoded to the page size.
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*/
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#define PAGE_SHIFT 12
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#define VIRTIO_MMIO_VRING_ALIGN PAGE_SIZE
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/**
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* virtio mmio transport driver private data
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*
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* @base: mmio transport device register base
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* @version: mmio transport device version
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*/
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struct virtio_mmio_priv {
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void __iomem *base;
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u32 version;
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};
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#endif /* _LINUX_VIRTIO_MMIO_H */
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