1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright 2019-2020 NXP
4 */
5
6#include <linux/debugfs.h>
7#include <linux/device.h>
8#include <linux/io.h>
9#include <linux/kernel.h>
10#include <linux/pm_runtime.h>
11#include <linux/seq_file.h>
12#include <linux/types.h>
13
14#include "imx8-isi-core.h"
15#include "imx8-isi-regs.h"
16
17static inline u32 mxc_isi_read(struct mxc_isi_pipe *pipe, u32 reg)
18{
19	return readl(pipe->regs + reg);
20}
21
22static int mxc_isi_debug_dump_regs_show(struct seq_file *m, void *p)
23{
24#define MXC_ISI_DEBUG_REG(name)		{ name, #name }
25	struct debug_regs {
26		u32 offset;
27		const char * const name;
28	};
29	static const struct debug_regs registers[] = {
30		MXC_ISI_DEBUG_REG(CHNL_CTRL),
31		MXC_ISI_DEBUG_REG(CHNL_IMG_CTRL),
32		MXC_ISI_DEBUG_REG(CHNL_OUT_BUF_CTRL),
33		MXC_ISI_DEBUG_REG(CHNL_IMG_CFG),
34		MXC_ISI_DEBUG_REG(CHNL_IER),
35		MXC_ISI_DEBUG_REG(CHNL_STS),
36		MXC_ISI_DEBUG_REG(CHNL_SCALE_FACTOR),
37		MXC_ISI_DEBUG_REG(CHNL_SCALE_OFFSET),
38		MXC_ISI_DEBUG_REG(CHNL_CROP_ULC),
39		MXC_ISI_DEBUG_REG(CHNL_CROP_LRC),
40		MXC_ISI_DEBUG_REG(CHNL_CSC_COEFF0),
41		MXC_ISI_DEBUG_REG(CHNL_CSC_COEFF1),
42		MXC_ISI_DEBUG_REG(CHNL_CSC_COEFF2),
43		MXC_ISI_DEBUG_REG(CHNL_CSC_COEFF3),
44		MXC_ISI_DEBUG_REG(CHNL_CSC_COEFF4),
45		MXC_ISI_DEBUG_REG(CHNL_CSC_COEFF5),
46		MXC_ISI_DEBUG_REG(CHNL_ROI_0_ALPHA),
47		MXC_ISI_DEBUG_REG(CHNL_ROI_0_ULC),
48		MXC_ISI_DEBUG_REG(CHNL_ROI_0_LRC),
49		MXC_ISI_DEBUG_REG(CHNL_ROI_1_ALPHA),
50		MXC_ISI_DEBUG_REG(CHNL_ROI_1_ULC),
51		MXC_ISI_DEBUG_REG(CHNL_ROI_1_LRC),
52		MXC_ISI_DEBUG_REG(CHNL_ROI_2_ALPHA),
53		MXC_ISI_DEBUG_REG(CHNL_ROI_2_ULC),
54		MXC_ISI_DEBUG_REG(CHNL_ROI_2_LRC),
55		MXC_ISI_DEBUG_REG(CHNL_ROI_3_ALPHA),
56		MXC_ISI_DEBUG_REG(CHNL_ROI_3_ULC),
57		MXC_ISI_DEBUG_REG(CHNL_ROI_3_LRC),
58		MXC_ISI_DEBUG_REG(CHNL_OUT_BUF1_ADDR_Y),
59		MXC_ISI_DEBUG_REG(CHNL_OUT_BUF1_ADDR_U),
60		MXC_ISI_DEBUG_REG(CHNL_OUT_BUF1_ADDR_V),
61		MXC_ISI_DEBUG_REG(CHNL_OUT_BUF_PITCH),
62		MXC_ISI_DEBUG_REG(CHNL_IN_BUF_ADDR),
63		MXC_ISI_DEBUG_REG(CHNL_IN_BUF_PITCH),
64		MXC_ISI_DEBUG_REG(CHNL_MEM_RD_CTRL),
65		MXC_ISI_DEBUG_REG(CHNL_OUT_BUF2_ADDR_Y),
66		MXC_ISI_DEBUG_REG(CHNL_OUT_BUF2_ADDR_U),
67		MXC_ISI_DEBUG_REG(CHNL_OUT_BUF2_ADDR_V),
68		MXC_ISI_DEBUG_REG(CHNL_SCL_IMG_CFG),
69		MXC_ISI_DEBUG_REG(CHNL_FLOW_CTRL),
70	};
71	/* These registers contain the upper 4 bits of 36-bit DMA addresses. */
72	static const struct debug_regs registers_36bit_dma[] = {
73		MXC_ISI_DEBUG_REG(CHNL_Y_BUF1_XTND_ADDR),
74		MXC_ISI_DEBUG_REG(CHNL_U_BUF1_XTND_ADDR),
75		MXC_ISI_DEBUG_REG(CHNL_V_BUF1_XTND_ADDR),
76		MXC_ISI_DEBUG_REG(CHNL_Y_BUF2_XTND_ADDR),
77		MXC_ISI_DEBUG_REG(CHNL_U_BUF2_XTND_ADDR),
78		MXC_ISI_DEBUG_REG(CHNL_V_BUF2_XTND_ADDR),
79		MXC_ISI_DEBUG_REG(CHNL_IN_BUF_XTND_ADDR),
80	};
81
82	struct mxc_isi_pipe *pipe = m->private;
83	unsigned int i;
84
85	if (!pm_runtime_get_if_in_use(pipe->isi->dev))
86		return 0;
87
88	seq_printf(m, "--- ISI pipe %u registers ---\n", pipe->id);
89
90	for (i = 0; i < ARRAY_SIZE(registers); ++i)
91		seq_printf(m, "%21s[0x%02x]: 0x%08x\n",
92			   registers[i].name, registers[i].offset,
93			   mxc_isi_read(pipe, registers[i].offset));
94
95	if (pipe->isi->pdata->has_36bit_dma) {
96		for (i = 0; i < ARRAY_SIZE(registers_36bit_dma); ++i) {
97			const struct debug_regs *reg = &registers_36bit_dma[i];
98
99			seq_printf(m, "%21s[0x%02x]: 0x%08x\n",
100				   reg->name, reg->offset,
101				   mxc_isi_read(pipe, reg->offset));
102		}
103	}
104
105	pm_runtime_put(pipe->isi->dev);
106
107	return 0;
108}
109DEFINE_SHOW_ATTRIBUTE(mxc_isi_debug_dump_regs);
110
111void mxc_isi_debug_init(struct mxc_isi_dev *isi)
112{
113	unsigned int i;
114
115	isi->debugfs_root = debugfs_create_dir(dev_name(isi->dev), NULL);
116
117	for (i = 0; i < isi->pdata->num_channels; ++i) {
118		struct mxc_isi_pipe *pipe = &isi->pipes[i];
119		char name[8];
120
121		sprintf(name, "pipe%u", pipe->id);
122		debugfs_create_file(name, 0444, isi->debugfs_root, pipe,
123				    &mxc_isi_debug_dump_regs_fops);
124	}
125}
126
127void mxc_isi_debug_cleanup(struct mxc_isi_dev *isi)
128{
129	debugfs_remove_recursive(isi->debugfs_root);
130}
131