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WIP: media: meson: vdec: add support for MPEG4 decoding
Add support for V4L2_PIX_FMT_MPEG4, V4L2_PIX_FMT_XVID and V4L2_PIX_FMT_H.263. This is experimental !!! Signed-off-by: Maxime Jourdan <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| // SPDX-License-Identifier: GPL-2.0+ | ||
| /* | ||
| * Copyright (C) 2018 Maxime Jourdan <[email protected]> | ||
| */ | ||
|
|
||
| #include <media/v4l2-mem2mem.h> | ||
| #include <media/videobuf2-dma-contig.h> | ||
|
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| #include "vdec_helpers.h" | ||
| #include "dos_regs.h" | ||
|
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| #define SIZE_WORKSPACE SZ_1M | ||
| /* Offset added by firmware, to substract from workspace paddr */ | ||
| #define DCAC_BUFF_START_IP 0x02b00000 | ||
|
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| /* map firmware registers to known MPEG4 functions */ | ||
| #define MREG_BUFFERIN AV_SCRATCH_8 | ||
| #define MREG_BUFFEROUT AV_SCRATCH_9 | ||
| #define MP4_NOT_CODED_CNT AV_SCRATCH_A | ||
| #define MP4_OFFSET_REG AV_SCRATCH_C | ||
| #define MEM_OFFSET_REG AV_SCRATCH_F | ||
| #define MREG_FATAL_ERROR AV_SCRATCH_L | ||
|
|
||
| #define BUF_IDX_MASK GENMASK(2, 0) | ||
| #define INTERLACE_FLAG BIT(7) | ||
| #define TOP_FIELD_FIRST_FLAG BIT(6) | ||
|
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| struct codec_mpeg4 { | ||
| /* Buffer for the MPEG4 Workspace */ | ||
| void *workspace_vaddr; | ||
| dma_addr_t workspace_paddr; | ||
| }; | ||
|
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| static int codec_mpeg4_can_recycle(struct amvdec_core *core) | ||
| { | ||
| return !amvdec_read_dos(core, MREG_BUFFERIN); | ||
| } | ||
|
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| static void codec_mpeg4_recycle(struct amvdec_core *core, u32 buf_idx) | ||
| { | ||
| amvdec_write_dos(core, MREG_BUFFERIN, ~BIT(buf_idx)); | ||
| } | ||
|
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||
| static int codec_mpeg4_start(struct amvdec_session *sess) { | ||
| struct amvdec_core *core = sess->core; | ||
| struct codec_mpeg4 *mpeg4 = sess->priv; | ||
| int ret; | ||
|
|
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| mpeg4 = kzalloc(sizeof(*mpeg4), GFP_KERNEL); | ||
| if (!mpeg4) | ||
| return -ENOMEM; | ||
|
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| /* Allocate some memory for the MPEG4 decoder's state */ | ||
| mpeg4->workspace_vaddr = dma_alloc_coherent(core->dev, SIZE_WORKSPACE, | ||
| &mpeg4->workspace_paddr, | ||
| GFP_KERNEL); | ||
| if (!mpeg4->workspace_vaddr) { | ||
| dev_err(core->dev, "Failed to request MPEG4 Workspace\n"); | ||
| ret = -ENOMEM; | ||
| goto free_mpeg4; | ||
| } | ||
|
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| /* Canvas regs: AV_SCRATCH_0-AV_SCRATCH_4;AV_SCRATCH_G-AV_SCRATCH_J */ | ||
| amvdec_set_canvases(sess, (u32[]){ AV_SCRATCH_0, AV_SCRATCH_G, 0 }, | ||
| (u32[]){ 4, 4, 0 }); | ||
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| amvdec_write_dos(core, MEM_OFFSET_REG, | ||
| mpeg4->workspace_paddr - DCAC_BUFF_START_IP); | ||
| amvdec_write_dos(core, PSCALE_CTRL, 0); | ||
| amvdec_write_dos(core, MP4_NOT_CODED_CNT, 0); | ||
| amvdec_write_dos(core, MREG_BUFFERIN, 0); | ||
| amvdec_write_dos(core, MREG_BUFFEROUT, 0); | ||
| amvdec_write_dos(core, MREG_FATAL_ERROR, 0); | ||
| amvdec_write_dos(core, MDEC_PIC_DC_THRESH, 0x404038aa); | ||
|
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| sess->keyframe_found = 1; | ||
| sess->priv = mpeg4; | ||
|
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| return 0; | ||
|
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| free_mpeg4: | ||
| kfree(mpeg4); | ||
| return ret; | ||
| } | ||
|
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| static int codec_mpeg4_stop(struct amvdec_session *sess) | ||
| { | ||
| struct codec_mpeg4 *mpeg4 = sess->priv; | ||
| struct amvdec_core *core = sess->core; | ||
|
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| if (mpeg4->workspace_vaddr) { | ||
| dma_free_coherent(core->dev, SIZE_WORKSPACE, | ||
| mpeg4->workspace_vaddr, | ||
| mpeg4->workspace_paddr); | ||
| mpeg4->workspace_vaddr = 0; | ||
| } | ||
|
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| return 0; | ||
| } | ||
|
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| static irqreturn_t codec_mpeg4_isr(struct amvdec_session *sess) | ||
| { | ||
| struct amvdec_core *core = sess->core; | ||
| u32 reg; | ||
| u32 buffer_index; | ||
| u32 field = V4L2_FIELD_NONE; | ||
|
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| reg = amvdec_read_dos(core, MREG_FATAL_ERROR); | ||
| if (reg == 1) { | ||
| dev_err(core->dev, "mpeg4 fatal error\n"); | ||
| amvdec_abort(sess); | ||
| return IRQ_HANDLED; | ||
| } | ||
|
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| reg = amvdec_read_dos(core, MREG_BUFFEROUT); | ||
| if (!reg) | ||
| goto end; | ||
|
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| buffer_index = reg & BUF_IDX_MASK; | ||
| if (reg & INTERLACE_FLAG) | ||
| field = (reg & TOP_FIELD_FIRST_FLAG) ? | ||
| V4L2_FIELD_INTERLACED_TB : | ||
| V4L2_FIELD_INTERLACED_BT; | ||
|
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| amvdec_dst_buf_done_idx(sess, buffer_index, -1, field); | ||
| amvdec_write_dos(core, MREG_BUFFEROUT, 0); | ||
|
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| end: | ||
| amvdec_write_dos(core, ASSIST_MBOX1_CLR_REG, 1); | ||
| return IRQ_HANDLED; | ||
| } | ||
|
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| struct amvdec_codec_ops codec_mpeg4_ops = { | ||
| .start = codec_mpeg4_start, | ||
| .stop = codec_mpeg4_stop, | ||
| .isr = codec_mpeg4_isr, | ||
| .can_recycle = codec_mpeg4_can_recycle, | ||
| .recycle = codec_mpeg4_recycle, | ||
| }; | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| /* SPDX-License-Identifier: GPL-2.0+ */ | ||
| /* | ||
| * Copyright (C) 2018 Maxime Jourdan <[email protected]> | ||
| */ | ||
|
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| #ifndef __MESON_VDEC_CODEC_MPEG4_H_ | ||
| #define __MESON_VDEC_CODEC_MPEG4_H_ | ||
|
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| #include "vdec.h" | ||
|
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| extern struct amvdec_codec_ops codec_mpeg4_ops; | ||
|
|
||
| #endif |
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