diff options
Diffstat (limited to 'drivers/virtio/virtio_mmio.h')
| -rw-r--r-- | drivers/virtio/virtio_mmio.h | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_mmio.h b/drivers/virtio/virtio_mmio.h new file mode 100644 index 0000000000..b3408828a5 --- /dev/null +++ b/drivers/virtio/virtio_mmio.h @@ -0,0 +1,129 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Copyright (C) 2018, Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi> + * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com> + * + * From Linux kernel include/uapi/linux/virtio_mmio.h + */ + +#ifndef _LINUX_VIRTIO_MMIO_H +#define _LINUX_VIRTIO_MMIO_H + +/* Control registers */ + +/* Magic value ("virt" string) - Read Only */ +#define VIRTIO_MMIO_MAGIC_VALUE 0x000 + +/* Virtio device version - Read Only */ +#define VIRTIO_MMIO_VERSION 0x004 + +/* Virtio device ID - Read Only */ +#define VIRTIO_MMIO_DEVICE_ID 0x008 + +/* Virtio vendor ID - Read Only */ +#define VIRTIO_MMIO_VENDOR_ID 0x00c + +/* + * Bitmask of the features supported by the device (host) + * (32 bits per set) - Read Only + */ +#define VIRTIO_MMIO_DEVICE_FEATURES 0x010 + +/* Device (host) features set selector - Write Only */ +#define VIRTIO_MMIO_DEVICE_FEATURES_SEL 0x014 + +/* + * Bitmask of features activated by the driver (guest) + * (32 bits per set) - Write Only + */ +#define VIRTIO_MMIO_DRIVER_FEATURES 0x020 + +/* Activated features set selector - Write Only */ +#define VIRTIO_MMIO_DRIVER_FEATURES_SEL 0x024 + +#ifndef VIRTIO_MMIO_NO_LEGACY /* LEGACY DEVICES ONLY! */ + +/* Guest's memory page size in bytes - Write Only */ +#define VIRTIO_MMIO_GUEST_PAGE_SIZE 0x028 + +#endif + +/* Queue selector - Write Only */ +#define VIRTIO_MMIO_QUEUE_SEL 0x030 + +/* Maximum size of the currently selected queue - Read Only */ +#define VIRTIO_MMIO_QUEUE_NUM_MAX 0x034 + +/* Queue size for the currently selected queue - Write Only */ +#define VIRTIO_MMIO_QUEUE_NUM 0x038 + +#ifndef VIRTIO_MMIO_NO_LEGACY /* LEGACY DEVICES ONLY! */ + +/* Used Ring alignment for the currently selected queue - Write Only */ +#define VIRTIO_MMIO_QUEUE_ALIGN 0x03c + +/* Guest's PFN for the currently selected queue - Read Write */ +#define VIRTIO_MMIO_QUEUE_PFN 0x040 + +#endif + +/* Ready bit for the currently selected queue - Read Write */ +#define VIRTIO_MMIO_QUEUE_READY 0x044 + +/* Queue notifier - Write Only */ +#define VIRTIO_MMIO_QUEUE_NOTIFY 0x050 + +/* Interrupt status - Read Only */ +#define VIRTIO_MMIO_INTERRUPT_STATUS 0x060 + +/* Interrupt acknowledge - Write Only */ +#define VIRTIO_MMIO_INTERRUPT_ACK 0x064 + +/* Device status register - Read Write */ +#define VIRTIO_MMIO_STATUS 0x070 + +/* Selected queue's Descriptor Table address, 64 bits in two halves */ +#define VIRTIO_MMIO_QUEUE_DESC_LOW 0x080 +#define VIRTIO_MMIO_QUEUE_DESC_HIGH 0x084 + +/* Selected queue's Available Ring address, 64 bits in two halves */ +#define VIRTIO_MMIO_QUEUE_AVAIL_LOW 0x090 +#define VIRTIO_MMIO_QUEUE_AVAIL_HIGH 0x094 + +/* Selected queue's Used Ring address, 64 bits in two halves */ +#define VIRTIO_MMIO_QUEUE_USED_LOW 0x0a0 +#define VIRTIO_MMIO_QUEUE_USED_HIGH 0x0a4 + +/* Configuration atomicity value */ +#define VIRTIO_MMIO_CONFIG_GENERATION 0x0fc + +/* + * The config space is defined by each driver as + * the per-driver configuration space - Read Write + */ +#define VIRTIO_MMIO_CONFIG 0x100 + +/* Interrupt flags (re: interrupt status & acknowledge registers) */ + +#define VIRTIO_MMIO_INT_VRING BIT(0) +#define VIRTIO_MMIO_INT_CONFIG BIT(1) + +/* + * The alignment to use between consumer and producer parts of vring. + * Currently hardcoded to the page size. + */ +#define PAGE_SHIFT 12 +#define VIRTIO_MMIO_VRING_ALIGN PAGE_SIZE + +/** + * virtio mmio transport driver private data + * + * @base: mmio transport device register base + * @version: mmio transport device version + */ +struct virtio_mmio_priv { + void __iomem *base; + u32 version; +}; + +#endif /* _LINUX_VIRTIO_MMIO_H */ |