mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-26 21:13:48 +00:00
4135e10732
This adds a transport driver that implements UCLASS_VIRTIO for virtio over pci, which is commonly used on x86. It only supports the legacy interface of the pci transport, which is the default device that QEMU emulates. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
173 lines
5.1 KiB
C
173 lines
5.1 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause */
|
|
/*
|
|
* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
|
|
*
|
|
* From Linux kernel include/uapi/linux/virtio_pci.h
|
|
*/
|
|
|
|
#ifndef _LINUX_VIRTIO_PCI_H
|
|
#define _LINUX_VIRTIO_PCI_H
|
|
|
|
#ifndef VIRTIO_PCI_NO_LEGACY
|
|
|
|
/* A 32-bit r/o bitmask of the features supported by the host */
|
|
#define VIRTIO_PCI_HOST_FEATURES 0
|
|
|
|
/* A 32-bit r/w bitmask of features activated by the guest */
|
|
#define VIRTIO_PCI_GUEST_FEATURES 4
|
|
|
|
/* A 32-bit r/w PFN for the currently selected queue */
|
|
#define VIRTIO_PCI_QUEUE_PFN 8
|
|
|
|
/* A 16-bit r/o queue size for the currently selected queue */
|
|
#define VIRTIO_PCI_QUEUE_NUM 12
|
|
|
|
/* A 16-bit r/w queue selector */
|
|
#define VIRTIO_PCI_QUEUE_SEL 14
|
|
|
|
/* A 16-bit r/w queue notifier */
|
|
#define VIRTIO_PCI_QUEUE_NOTIFY 16
|
|
|
|
/* An 8-bit device status register */
|
|
#define VIRTIO_PCI_STATUS 18
|
|
|
|
/*
|
|
* An 8-bit r/o interrupt status register. Reading the value will return the
|
|
* current contents of the ISR and will also clear it. This is effectively
|
|
* a read-and-acknowledge.
|
|
*/
|
|
#define VIRTIO_PCI_ISR 19
|
|
|
|
/* MSI-X registers: only enabled if MSI-X is enabled */
|
|
|
|
/* A 16-bit vector for configuration changes */
|
|
#define VIRTIO_MSI_CONFIG_VECTOR 20
|
|
/* A 16-bit vector for selected queue notifications */
|
|
#define VIRTIO_MSI_QUEUE_VECTOR 22
|
|
|
|
/*
|
|
* The remaining space is defined by each driver as the per-driver
|
|
* configuration space
|
|
*/
|
|
#define VIRTIO_PCI_CONFIG_OFF(msix) ((msix) ? 24 : 20)
|
|
|
|
/* Virtio ABI version, this must match exactly */
|
|
#define VIRTIO_PCI_ABI_VERSION 0
|
|
|
|
/*
|
|
* How many bits to shift physical queue address written to QUEUE_PFN.
|
|
* 12 is historical, and due to x86 page size.
|
|
*/
|
|
#define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12
|
|
|
|
/*
|
|
* The alignment to use between consumer and producer parts of vring.
|
|
* x86 pagesize again.
|
|
*/
|
|
#define VIRTIO_PCI_VRING_ALIGN 4096
|
|
|
|
#endif /* VIRTIO_PCI_NO_LEGACY */
|
|
|
|
/* The bit of the ISR which indicates a device configuration change */
|
|
#define VIRTIO_PCI_ISR_CONFIG 0x2
|
|
/* Vector value used to disable MSI for queue */
|
|
#define VIRTIO_MSI_NO_VECTOR 0xffff
|
|
|
|
#ifndef VIRTIO_PCI_NO_MODERN
|
|
|
|
/* IDs for different capabilities. Must all exist. */
|
|
|
|
/* Common configuration */
|
|
#define VIRTIO_PCI_CAP_COMMON_CFG 1
|
|
/* Notifications */
|
|
#define VIRTIO_PCI_CAP_NOTIFY_CFG 2
|
|
/* ISR access */
|
|
#define VIRTIO_PCI_CAP_ISR_CFG 3
|
|
/* Device specific configuration */
|
|
#define VIRTIO_PCI_CAP_DEVICE_CFG 4
|
|
/* PCI configuration access */
|
|
#define VIRTIO_PCI_CAP_PCI_CFG 5
|
|
|
|
/* This is the PCI capability header: */
|
|
struct virtio_pci_cap {
|
|
__u8 cap_vndr; /* Generic PCI field: PCI_CAP_ID_VNDR */
|
|
__u8 cap_next; /* Generic PCI field: next ptr */
|
|
__u8 cap_len; /* Generic PCI field: capability length */
|
|
__u8 cfg_type; /* Identifies the structure */
|
|
__u8 bar; /* Where to find it */
|
|
__u8 padding[3]; /* Pad to full dword */
|
|
__le32 offset; /* Offset within bar */
|
|
__le32 length; /* Length of the structure, in bytes */
|
|
};
|
|
|
|
struct virtio_pci_notify_cap {
|
|
struct virtio_pci_cap cap;
|
|
__le32 notify_off_multiplier; /* Multiplier for queue_notify_off */
|
|
};
|
|
|
|
/* Fields in VIRTIO_PCI_CAP_COMMON_CFG: */
|
|
struct virtio_pci_common_cfg {
|
|
/* About the whole device */
|
|
__le32 device_feature_select; /* read-write */
|
|
__le32 device_feature; /* read-only */
|
|
__le32 guest_feature_select; /* read-write */
|
|
__le32 guest_feature; /* read-write */
|
|
__le16 msix_config; /* read-write */
|
|
__le16 num_queues; /* read-only */
|
|
__u8 device_status; /* read-write */
|
|
__u8 config_generation; /* read-only */
|
|
|
|
/* About a specific virtqueue */
|
|
__le16 queue_select; /* read-write */
|
|
__le16 queue_size; /* read-write, power of 2 */
|
|
__le16 queue_msix_vector; /* read-write */
|
|
__le16 queue_enable; /* read-write */
|
|
__le16 queue_notify_off; /* read-only */
|
|
__le32 queue_desc_lo; /* read-write */
|
|
__le32 queue_desc_hi; /* read-write */
|
|
__le32 queue_avail_lo; /* read-write */
|
|
__le32 queue_avail_hi; /* read-write */
|
|
__le32 queue_used_lo; /* read-write */
|
|
__le32 queue_used_hi; /* read-write */
|
|
};
|
|
|
|
/* Fields in VIRTIO_PCI_CAP_PCI_CFG: */
|
|
struct virtio_pci_cfg_cap {
|
|
struct virtio_pci_cap cap;
|
|
__u8 pci_cfg_data[4]; /* Data for BAR access */
|
|
};
|
|
|
|
/* Macro versions of offsets for the Old Timers! */
|
|
#define VIRTIO_PCI_CAP_VNDR 0
|
|
#define VIRTIO_PCI_CAP_NEXT 1
|
|
#define VIRTIO_PCI_CAP_LEN 2
|
|
#define VIRTIO_PCI_CAP_CFG_TYPE 3
|
|
#define VIRTIO_PCI_CAP_BAR 4
|
|
#define VIRTIO_PCI_CAP_OFFSET 8
|
|
#define VIRTIO_PCI_CAP_LENGTH 12
|
|
|
|
#define VIRTIO_PCI_NOTIFY_CAP_MULT 16
|
|
|
|
#define VIRTIO_PCI_COMMON_DFSELECT 0
|
|
#define VIRTIO_PCI_COMMON_DF 4
|
|
#define VIRTIO_PCI_COMMON_GFSELECT 8
|
|
#define VIRTIO_PCI_COMMON_GF 12
|
|
#define VIRTIO_PCI_COMMON_MSIX 16
|
|
#define VIRTIO_PCI_COMMON_NUMQ 18
|
|
#define VIRTIO_PCI_COMMON_STATUS 20
|
|
#define VIRTIO_PCI_COMMON_CFGGENERATION 21
|
|
#define VIRTIO_PCI_COMMON_Q_SELECT 22
|
|
#define VIRTIO_PCI_COMMON_Q_SIZE 24
|
|
#define VIRTIO_PCI_COMMON_Q_MSIX 26
|
|
#define VIRTIO_PCI_COMMON_Q_ENABLE 28
|
|
#define VIRTIO_PCI_COMMON_Q_NOFF 30
|
|
#define VIRTIO_PCI_COMMON_Q_DESCLO 32
|
|
#define VIRTIO_PCI_COMMON_Q_DESCHI 36
|
|
#define VIRTIO_PCI_COMMON_Q_AVAILLO 40
|
|
#define VIRTIO_PCI_COMMON_Q_AVAILHI 44
|
|
#define VIRTIO_PCI_COMMON_Q_USEDLO 48
|
|
#define VIRTIO_PCI_COMMON_Q_USEDHI 52
|
|
|
|
#endif /* VIRTIO_PCI_NO_MODERN */
|
|
|
|
#endif /* _LINUX_VIRTIO_PCI_H */
|