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https://github.com/rd-stuffs/msm-4.14.git
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c978ad3a8b
This is virtio clock frontend driver for guest virtual machine. It operates clocks by requesting clock backend which is in hypervisor. The frontend driver talks with backend device via the virtio interface. Change-Id: I0cd2def134e029b7762ddec2c799ab5057568caf Signed-off-by: Zhiqiang Tu <ztu@codeaurora.org>
51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
/* Copyright (c) 2019, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _LINUX_VIRTIO_CLK_H
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#define _LINUX_VIRTIO_CLK_H
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#include <linux/types.h>
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#include <linux/virtio_ids.h>
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#include <linux/virtio_config.h>
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#include <linux/virtio_types.h>
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/* Feature bits */
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#define VIRTIO_CLK_F_RESET 1 /* Support reset */
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#define VIRTIO_CLK_F_NAME 2 /* Support clock name */
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/* Configuration layout */
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struct virtio_clk_config {
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__u32 num_clks;
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__u32 num_resets;
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__u8 name[20];
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} __packed;
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/* Request/response message format */
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struct virtio_clk_msg {
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u8 name[40];
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__virtio32 id;
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__virtio32 type;
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__virtio32 result;
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__virtio32 data[4];
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};
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/* Request type */
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#define VIRTIO_CLK_T_ENABLE 0
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#define VIRTIO_CLK_T_DISABLE 1
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#define VIRTIO_CLK_T_SET_RATE 2
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#define VIRTIO_CLK_T_GET_RATE 3
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#define VIRTIO_CLK_T_ROUND_RATE 4
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#define VIRTIO_CLK_T_RESET 5
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#define VIRTIO_CLK_T_SET_FLAGS 6
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#endif /* _LINUX_VIRTIO_CLK_H */
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