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
 43struct dw_hdma_debugfs_entry {
 44	const char				*name;
 45	void __iomem				*reg;
 46};
 47
 48static 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}
 57DEFINE_DEBUGFS_ATTRIBUTE(fops_x32, dw_hdma_debugfs_u32_get, NULL, "0x%08llx\n");
 58
 59static 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
 79static 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
116static 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
133static 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
150static 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
160void 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}