1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2023 Cai Huoqing
4 * Synopsys DesignWare HDMA v0 debugfs
5 *
6 * Author: Cai Huoqing <cai.huoqing@linux.dev>
7 */
8
9 #include <linux/debugfs.h>
10 #include <linux/bitfield.h>
11
12 #include "dw-hdma-v0-debugfs.h"
13 #include "dw-hdma-v0-regs.h"
14 #include "dw-edma-core.h"
15
16 #define REGS_ADDR(dw, name) \
17 ({ \
18 struct dw_hdma_v0_regs __iomem *__regs = (dw)->chip->reg_base; \
19 \
20 (void __iomem *)&__regs->name; \
21 })
22
23 #define REGS_CH_ADDR(dw, name, _dir, _ch) \
24 ({ \
25 struct dw_hdma_v0_ch_regs __iomem *__ch_regs; \
26 \
27 if (_dir == EDMA_DIR_READ) \
28 __ch_regs = REGS_ADDR(dw, ch[_ch].rd); \
29 else \
30 __ch_regs = REGS_ADDR(dw, ch[_ch].wr); \
31 \
32 (void __iomem *)&__ch_regs->name; \
33 })
34
35 #define CTX_REGISTER(dw, name, dir, ch) \
36 {#name, REGS_CH_ADDR(dw, name, dir, ch)}
37
38 #define WRITE_STR "write"
39 #define READ_STR "read"
40 #define CHANNEL_STR "channel"
41 #define REGISTERS_STR "registers"
42
43 struct dw_hdma_debugfs_entry {
44 const char *name;
45 void __iomem *reg;
46 };
47
dw_hdma_debugfs_u32_get(void * data,u64 * val)48 static int dw_hdma_debugfs_u32_get(void *data, u64 *val)
49 {
50 struct dw_hdma_debugfs_entry *entry = data;
51 void __iomem *reg = entry->reg;
52
53 *val = readl(reg);
54
55 return 0;
56 }
57 DEFINE_DEBUGFS_ATTRIBUTE(fops_x32, dw_hdma_debugfs_u32_get, NULL, "0x%08llx\n");
58
dw_hdma_debugfs_create_x32(struct dw_edma * dw,const struct dw_hdma_debugfs_entry ini[],int nr_entries,struct dentry * dent)59 static void dw_hdma_debugfs_create_x32(struct dw_edma *dw,
60 const struct dw_hdma_debugfs_entry ini[],
61 int nr_entries, struct dentry *dent)
62 {
63 struct dw_hdma_debugfs_entry *entries;
64 int i;
65
66 entries = devm_kcalloc(dw->chip->dev, nr_entries, sizeof(*entries),
67 GFP_KERNEL);
68 if (!entries)
69 return;
70
71 for (i = 0; i < nr_entries; i++) {
72 entries[i] = ini[i];
73
74 debugfs_create_file_unsafe(entries[i].name, 0444, dent,
75 &entries[i], &fops_x32);
76 }
77 }
78
dw_hdma_debugfs_regs_ch(struct dw_edma * dw,enum dw_edma_dir dir,u16 ch,struct dentry * dent)79 static void dw_hdma_debugfs_regs_ch(struct dw_edma *dw, enum dw_edma_dir dir,
80 u16 ch, struct dentry *dent)
81 {
82 const struct dw_hdma_debugfs_entry debugfs_regs[] = {
83 CTX_REGISTER(dw, ch_en, dir, ch),
84 CTX_REGISTER(dw, doorbell, dir, ch),
85 CTX_REGISTER(dw, prefetch, dir, ch),
86 CTX_REGISTER(dw, handshake, dir, ch),
87 CTX_REGISTER(dw, llp.lsb, dir, ch),
88 CTX_REGISTER(dw, llp.msb, dir, ch),
89 CTX_REGISTER(dw, cycle_sync, dir, ch),
90 CTX_REGISTER(dw, transfer_size, dir, ch),
91 CTX_REGISTER(dw, sar.lsb, dir, ch),
92 CTX_REGISTER(dw, sar.msb, dir, ch),
93 CTX_REGISTER(dw, dar.lsb, dir, ch),
94 CTX_REGISTER(dw, dar.msb, dir, ch),
95 CTX_REGISTER(dw, watermark_en, dir, ch),
96 CTX_REGISTER(dw, control1, dir, ch),
97 CTX_REGISTER(dw, func_num, dir, ch),
98 CTX_REGISTER(dw, qos, dir, ch),
99 CTX_REGISTER(dw, ch_stat, dir, ch),
100 CTX_REGISTER(dw, int_stat, dir, ch),
101 CTX_REGISTER(dw, int_setup, dir, ch),
102 CTX_REGISTER(dw, int_clear, dir, ch),
103 CTX_REGISTER(dw, msi_stop.lsb, dir, ch),
104 CTX_REGISTER(dw, msi_stop.msb, dir, ch),
105 CTX_REGISTER(dw, msi_watermark.lsb, dir, ch),
106 CTX_REGISTER(dw, msi_watermark.msb, dir, ch),
107 CTX_REGISTER(dw, msi_abort.lsb, dir, ch),
108 CTX_REGISTER(dw, msi_abort.msb, dir, ch),
109 CTX_REGISTER(dw, msi_msgdata, dir, ch),
110 };
111 int nr_entries = ARRAY_SIZE(debugfs_regs);
112
113 dw_hdma_debugfs_create_x32(dw, debugfs_regs, nr_entries, dent);
114 }
115
dw_hdma_debugfs_regs_wr(struct dw_edma * dw,struct dentry * dent)116 static void dw_hdma_debugfs_regs_wr(struct dw_edma *dw, struct dentry *dent)
117 {
118 struct dentry *regs_dent, *ch_dent;
119 char name[32];
120 int i;
121
122 regs_dent = debugfs_create_dir(WRITE_STR, dent);
123
124 for (i = 0; i < dw->wr_ch_cnt; i++) {
125 snprintf(name, sizeof(name), "%s:%d", CHANNEL_STR, i);
126
127 ch_dent = debugfs_create_dir(name, regs_dent);
128
129 dw_hdma_debugfs_regs_ch(dw, EDMA_DIR_WRITE, i, ch_dent);
130 }
131 }
132
dw_hdma_debugfs_regs_rd(struct dw_edma * dw,struct dentry * dent)133 static void dw_hdma_debugfs_regs_rd(struct dw_edma *dw, struct dentry *dent)
134 {
135 struct dentry *regs_dent, *ch_dent;
136 char name[32];
137 int i;
138
139 regs_dent = debugfs_create_dir(READ_STR, dent);
140
141 for (i = 0; i < dw->rd_ch_cnt; i++) {
142 snprintf(name, sizeof(name), "%s:%d", CHANNEL_STR, i);
143
144 ch_dent = debugfs_create_dir(name, regs_dent);
145
146 dw_hdma_debugfs_regs_ch(dw, EDMA_DIR_READ, i, ch_dent);
147 }
148 }
149
dw_hdma_debugfs_regs(struct dw_edma * dw)150 static void dw_hdma_debugfs_regs(struct dw_edma *dw)
151 {
152 struct dentry *regs_dent;
153
154 regs_dent = debugfs_create_dir(REGISTERS_STR, dw->dma.dbg_dev_root);
155
156 dw_hdma_debugfs_regs_wr(dw, regs_dent);
157 dw_hdma_debugfs_regs_rd(dw, regs_dent);
158 }
159
dw_hdma_v0_debugfs_on(struct dw_edma * dw)160 void dw_hdma_v0_debugfs_on(struct dw_edma *dw)
161 {
162 if (!debugfs_initialized())
163 return;
164
165 debugfs_create_u32("mf", 0444, dw->dma.dbg_dev_root, &dw->chip->mf);
166 debugfs_create_u16("wr_ch_cnt", 0444, dw->dma.dbg_dev_root, &dw->wr_ch_cnt);
167 debugfs_create_u16("rd_ch_cnt", 0444, dw->dma.dbg_dev_root, &dw->rd_ch_cnt);
168
169 dw_hdma_debugfs_regs(dw);
170 }
171