drivers/dma/dw-edma/dw-hdma-v0-debugfs.c

   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
  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
  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
  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
 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[16];
 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
 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[16];
 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
 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
 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 }