threeeye
bc1d038eac
Squashed backup commit (no shallow-clone history issues) of xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream commit 9eece662e) plus all fixes applied to get everpal_defconfig building clean against a modern (GCC 15.2.0) toolchain -- see the previous commit message on the lineage-23.2 branch (also in this repo history is not available here since this is a squashed snapshot; full incremental history lives in the local DL380 checkout and the upstream GitHub remote). Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
85 lines
3.5 KiB
C
85 lines
3.5 KiB
C
/*
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* Copyright (C) 2016 MediaTek Inc.
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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 as
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* 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.
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* See http://www.gnu.org/licenses/gpl-2.0.html for more details.
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*/
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#ifndef _RING_EMI_H_
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#define _RING_EMI_H_
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#include <linux/io.h>
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#define ROUND_REPEAT
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#define EMI_READ32(addr) (readl(addr))
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#define EMI_WRITE32(addr, data) (writel(data, addr))
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struct ring_emi {
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/* addr where ring buffer starts */
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void *base;
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/* addr storing the next writable pos, guaranteed to be >= read except when write overflow, but it's ok. */
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void *write;
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/* addr storing the next readable pos, except when read == write as buffer empty */
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void *read;
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/* must be power of 2 */
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unsigned int max_size;
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};
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struct ring_emi_segment {
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/* addr points into ring buffer for read/write */
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void *ring_emi_pt;
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/* size to read/write */
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unsigned int sz;
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/* pos in external data buffer to read/write */
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unsigned int data_pos;
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/* the size to be read/write after this segment completed */
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unsigned int remain;
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};
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void ring_emi_init(void *base, unsigned int max_size, void *read, void *write, struct ring_emi *ring_emi);
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unsigned int ring_emi_read_prepare(unsigned int sz, struct ring_emi_segment *seg, struct ring_emi *ring_emi);
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#define ring_emi_read_all_prepare(seg, ring_emi) ring_emi_read_prepare((ring_emi)->max_size, seg, ring_emi)
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unsigned int ring_emi_write_prepare(unsigned int sz, struct ring_emi_segment *seg, struct ring_emi *ring_emi);
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/* making sure max_size is power of 2 */
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#define RING_EMI_VALIDATE_SIZE(max_size) WARN_ON(!max_size || (max_size & (max_size - 1)))
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#define RING_EMI_EMPTY(ring_emi) (EMI_READ32((ring_emi)->read) == EMI_READ32((ring_emi)->write))
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/* equation works even when write overflow */
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#define RING_EMI_SIZE(ring_emi) (EMI_READ32((ring_emi)->write) - EMI_READ32((ring_emi)->read))
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#ifdef ROUND_REPEAT
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#define RING_EMI_FULL(ring_emi) (((EMI_READ32((ring_emi)->write) + 1) & ((ring_emi)->max_size - 1)) \
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== EMI_READ32((ring_emi)->read))
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#else
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#define RING_EMI_FULL(ring_emi) (RING_EMI_SIZE(ring_emi) == (ring_emi)->max_size)
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#endif
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#define RING_EMI_READ_FOR_EACH(_sz, _seg, _ring_emi) \
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for (_ring_emi_segment_prepare(EMI_READ32((_ring_emi)->read), &(_seg), (_ring_emi)); \
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(_seg).sz > 0; \
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_ring_emi_read_commit(&(_seg), (_ring_emi)), \
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_ring_emi_segment_prepare(EMI_READ32((_ring_emi)->read), &(_seg), (_ring_emi)))
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#define RING_EMI_READ_ALL_FOR_EACH(seg, ring_emi) RING_EMI_READ_FOR_EACH((ring_emi)->max_size, seg, ring_emi)
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#define RING_EMI_WRITE_FOR_EACH(_sz, _seg, _ring_emi) \
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for (_ring_emi_segment_prepare(EMI_READ32((_ring_emi)->write), &(_seg), (_ring_emi)); \
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(_seg).sz > 0; \
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_ring_emi_write_commit(&(_seg), (_ring_emi)), \
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_ring_emi_segment_prepare(EMI_READ32((_ring_emi)->write), &(_seg), (_ring_emi)))
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void ring_emi_dump(const char *title, struct ring_emi *ring_emi);
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void ring_emi_dump_segment(const char *title, struct ring_emi_segment *seg);
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/* Ring Buffer Internal API */
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void _ring_emi_segment_prepare(unsigned int from, struct ring_emi_segment *seg, struct ring_emi *ring_emi);
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void _ring_emi_read_commit(struct ring_emi_segment *seg, struct ring_emi *ring_emi);
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void _ring_emi_write_commit(struct ring_emi_segment *seg, struct ring_emi *ring_emi);
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#endif
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