1// SPDX-License-Identifier: GPL-2.0-only
2// Copyright(c) 2023 Intel Corporation. All rights reserved.
3
4#include <linux/acpi.h>
5#include <linux/debugfs.h>
6#include <linux/delay.h>
7#include <linux/device.h>
8#include <linux/io.h>
9#include <linux/pm_runtime.h>
10#include <linux/soundwire/sdw.h>
11#include <linux/soundwire/sdw_intel.h>
12#include <linux/soundwire/sdw_registers.h>
13#include "bus.h"
14#include "cadence_master.h"
15#include "intel.h"
16
17/*
18 * debugfs
19 */
20#ifdef CONFIG_DEBUG_FS
21
22#define RD_BUF (2 * PAGE_SIZE)
23
24static ssize_t intel_sprintf(void __iomem *mem, bool l,
25			     char *buf, size_t pos, unsigned int reg)
26{
27	int value;
28
29	if (l)
30		value = intel_readl(mem, reg);
31	else
32		value = intel_readw(mem, reg);
33
34	return scnprintf(buf + pos, RD_BUF - pos, "%4x\t%4x\n", reg, value);
35}
36
37static int intel_reg_show(struct seq_file *s_file, void *data)
38{
39	struct sdw_intel *sdw = s_file->private;
40	void __iomem *s = sdw->link_res->shim;
41	void __iomem *vs_s = sdw->link_res->shim_vs;
42	ssize_t ret;
43	u32 pcm_cap;
44	int pcm_bd;
45	char *buf;
46	int j;
47
48	buf = kzalloc(RD_BUF, GFP_KERNEL);
49	if (!buf)
50		return -ENOMEM;
51
52	ret = scnprintf(buf, RD_BUF, "Register  Value\n");
53	ret += scnprintf(buf + ret, RD_BUF - ret, "\nShim\n");
54
55	ret += intel_sprintf(s, true, buf, ret, SDW_SHIM2_LECAP);
56	ret += intel_sprintf(s, false, buf, ret, SDW_SHIM2_PCMSCAP);
57
58	pcm_cap = intel_readw(s, SDW_SHIM2_PCMSCAP);
59	pcm_bd = FIELD_GET(SDW_SHIM2_PCMSCAP_BSS, pcm_cap);
60
61	for (j = 0; j < pcm_bd; j++) {
62		ret += intel_sprintf(s, false, buf, ret,
63				SDW_SHIM2_PCMSYCHM(j));
64		ret += intel_sprintf(s, false, buf, ret,
65				SDW_SHIM2_PCMSYCHC(j));
66	}
67
68	ret += scnprintf(buf + ret, RD_BUF - ret, "\nVS CLK controls\n");
69	ret += intel_sprintf(vs_s, true, buf, ret, SDW_SHIM2_INTEL_VS_LVSCTL);
70
71	ret += scnprintf(buf + ret, RD_BUF - ret, "\nVS Wake registers\n");
72	ret += intel_sprintf(vs_s, false, buf, ret, SDW_SHIM2_INTEL_VS_WAKEEN);
73	ret += intel_sprintf(vs_s, false, buf, ret, SDW_SHIM2_INTEL_VS_WAKESTS);
74
75	ret += scnprintf(buf + ret, RD_BUF - ret, "\nVS IOCTL, ACTMCTL\n");
76	ret += intel_sprintf(vs_s, false, buf, ret, SDW_SHIM2_INTEL_VS_IOCTL);
77	ret += intel_sprintf(vs_s, false, buf, ret, SDW_SHIM2_INTEL_VS_ACTMCTL);
78
79	seq_printf(s_file, "%s", buf);
80	kfree(buf);
81
82	return 0;
83}
84DEFINE_SHOW_ATTRIBUTE(intel_reg);
85
86static int intel_set_m_datamode(void *data, u64 value)
87{
88	struct sdw_intel *sdw = data;
89	struct sdw_bus *bus = &sdw->cdns.bus;
90
91	if (value > SDW_PORT_DATA_MODE_STATIC_1)
92		return -EINVAL;
93
94	/* Userspace changed the hardware state behind the kernel's back */
95	add_taint(TAINT_USER, LOCKDEP_STILL_OK);
96
97	bus->params.m_data_mode = value;
98
99	return 0;
100}
101DEFINE_DEBUGFS_ATTRIBUTE(intel_set_m_datamode_fops, NULL,
102			 intel_set_m_datamode, "%llu\n");
103
104static int intel_set_s_datamode(void *data, u64 value)
105{
106	struct sdw_intel *sdw = data;
107	struct sdw_bus *bus = &sdw->cdns.bus;
108
109	if (value > SDW_PORT_DATA_MODE_STATIC_1)
110		return -EINVAL;
111
112	/* Userspace changed the hardware state behind the kernel's back */
113	add_taint(TAINT_USER, LOCKDEP_STILL_OK);
114
115	bus->params.s_data_mode = value;
116
117	return 0;
118}
119DEFINE_DEBUGFS_ATTRIBUTE(intel_set_s_datamode_fops, NULL,
120			 intel_set_s_datamode, "%llu\n");
121
122void intel_ace2x_debugfs_init(struct sdw_intel *sdw)
123{
124	struct dentry *root = sdw->cdns.bus.debugfs;
125
126	if (!root)
127		return;
128
129	sdw->debugfs = debugfs_create_dir("intel-sdw", root);
130
131	debugfs_create_file("intel-registers", 0400, sdw->debugfs, sdw,
132			    &intel_reg_fops);
133
134	debugfs_create_file("intel-m-datamode", 0200, sdw->debugfs, sdw,
135			    &intel_set_m_datamode_fops);
136
137	debugfs_create_file("intel-s-datamode", 0200, sdw->debugfs, sdw,
138			    &intel_set_s_datamode_fops);
139
140	sdw_cdns_debugfs_init(&sdw->cdns, sdw->debugfs);
141}
142
143void intel_ace2x_debugfs_exit(struct sdw_intel *sdw)
144{
145	debugfs_remove_recursive(sdw->debugfs);
146}
147#endif /* CONFIG_DEBUG_FS */
148