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[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 } 132 133 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 } 149 150 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 } 171