Linux kernel mirror (for testing)
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linux
1// SPDX-License-Identifier: GPL-2.0-only
2// Copyright(c) 2023 Intel Corporation
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 if (sdw->link_res->mic_privacy) {
80 ret += scnprintf(buf + ret, RD_BUF - ret, "\nVS PVCCS\n");
81 ret += intel_sprintf(vs_s, false, buf, ret,
82 SDW_SHIM2_INTEL_VS_PVCCS);
83 }
84
85 seq_printf(s_file, "%s", buf);
86 kfree(buf);
87
88 return 0;
89}
90DEFINE_SHOW_ATTRIBUTE(intel_reg);
91
92static int intel_set_m_datamode(void *data, u64 value)
93{
94 struct sdw_intel *sdw = data;
95 struct sdw_bus *bus = &sdw->cdns.bus;
96
97 if (value > SDW_PORT_DATA_MODE_STATIC_1)
98 return -EINVAL;
99
100 /* Userspace changed the hardware state behind the kernel's back */
101 add_taint(TAINT_USER, LOCKDEP_STILL_OK);
102
103 bus->params.m_data_mode = value;
104
105 return 0;
106}
107DEFINE_DEBUGFS_ATTRIBUTE(intel_set_m_datamode_fops, NULL,
108 intel_set_m_datamode, "%llu\n");
109
110static int intel_set_s_datamode(void *data, u64 value)
111{
112 struct sdw_intel *sdw = data;
113 struct sdw_bus *bus = &sdw->cdns.bus;
114
115 if (value > SDW_PORT_DATA_MODE_STATIC_1)
116 return -EINVAL;
117
118 /* Userspace changed the hardware state behind the kernel's back */
119 add_taint(TAINT_USER, LOCKDEP_STILL_OK);
120
121 bus->params.s_data_mode = value;
122
123 return 0;
124}
125DEFINE_DEBUGFS_ATTRIBUTE(intel_set_s_datamode_fops, NULL,
126 intel_set_s_datamode, "%llu\n");
127
128void intel_ace2x_debugfs_init(struct sdw_intel *sdw)
129{
130 struct dentry *root = sdw->cdns.bus.debugfs;
131
132 if (!root)
133 return;
134
135 sdw->debugfs = debugfs_create_dir("intel-sdw", root);
136
137 debugfs_create_file("intel-registers", 0400, sdw->debugfs, sdw,
138 &intel_reg_fops);
139
140 debugfs_create_file("intel-m-datamode", 0200, sdw->debugfs, sdw,
141 &intel_set_m_datamode_fops);
142
143 debugfs_create_file("intel-s-datamode", 0200, sdw->debugfs, sdw,
144 &intel_set_s_datamode_fops);
145
146 sdw_cdns_debugfs_init(&sdw->cdns, sdw->debugfs);
147}
148
149void intel_ace2x_debugfs_exit(struct sdw_intel *sdw)
150{
151 debugfs_remove_recursive(sdw->debugfs);
152}
153#endif /* CONFIG_DEBUG_FS */