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
mxc_isi_read(struct mxc_isi_pipe * pipe,u32 reg)17 static inline u32 mxc_isi_read(struct mxc_isi_pipe *pipe, u32 reg)
18 {
19 return readl(pipe->regs + reg);
20 }
21
mxc_isi_debug_dump_regs_show(struct seq_file * m,void * p)22 static 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 = ®isters_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 }
109 DEFINE_SHOW_ATTRIBUTE(mxc_isi_debug_dump_regs);
110
mxc_isi_debug_init(struct mxc_isi_dev * isi)111 void 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
mxc_isi_debug_cleanup(struct mxc_isi_dev * isi)127 void mxc_isi_debug_cleanup(struct mxc_isi_dev *isi)
128 {
129 debugfs_remove_recursive(isi->debugfs_root);
130 }
131