summaryrefslogtreecommitdiffstats
path: root/arch/x86/platform/atom/punit_atom_debug.c
blob: f8ed5f66cd206a024f4c4ceb4f0a1373739fbdd1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Intel SOC Punit device state debug driver
 * Punit controls power management for North Complex devices (Graphics
 * blocks, Image Signal Processing, video processing, display, DSP etc.)
 *
 * Copyright (c) 2015, Intel Corporation.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/io.h>
#include <asm/cpu_device_id.h>
#include <asm/intel-family.h>
#include <asm/iosf_mbi.h>

/* Subsystem config/status Video processor */
#define VED_SS_PM0		0x32
/* Subsystem config/status ISP (Image Signal Processor) */
#define ISP_SS_PM0		0x39
/* Subsystem config/status Input/output controller */
#define MIO_SS_PM		0x3B
/* Shift bits for getting status for video, isp and i/o */
#define SSS_SHIFT		24

/* Power gate status reg */
#define PWRGT_STATUS		0x61
/* Shift bits for getting status for graphics rendering */
#define RENDER_POS		0
/* Shift bits for getting status for media control */
#define MEDIA_POS		2
/* Shift bits for getting status for Valley View/Baytrail display */
#define VLV_DISPLAY_POS		6

/* Subsystem config/status display for Cherry Trail SOC */
#define CHT_DSP_SSS		0x36
/* Shift bits for getting status for display */
#define CHT_DSP_SSS_POS		16

struct punit_device {
	char *name;
	int reg;
	int sss_pos;
};

static const struct punit_device punit_device_tng[] = {
	{ "DISPLAY",	CHT_DSP_SSS,	SSS_SHIFT },
	{ "VED",	VED_SS_PM0,	SSS_SHIFT },
	{ "ISP",	ISP_SS_PM0,	SSS_SHIFT },
	{ "MIO",	MIO_SS_PM,	SSS_SHIFT },
	{ NULL }
};

static const struct punit_device punit_device_byt[] = {
	{ "GFX RENDER",	PWRGT_STATUS,	RENDER_POS },
	{ "GFX MEDIA",	PWRGT_STATUS,	MEDIA_POS },
	{ "DISPLAY",	PWRGT_STATUS,	VLV_DISPLAY_POS },
	{ "VED",	VED_SS_PM0,	SSS_SHIFT },
	{ "ISP",	ISP_SS_PM0,	SSS_SHIFT },
	{ "MIO",	MIO_SS_PM,	SSS_SHIFT },
	{ NULL }
};

static const struct punit_device punit_device_cht[] = {
	{ "GFX RENDER",	PWRGT_STATUS,	RENDER_POS },
	{ "GFX MEDIA",	PWRGT_STATUS,	MEDIA_POS },
	{ "DISPLAY",	CHT_DSP_SSS,	CHT_DSP_SSS_POS },
	{ "VED",	VED_SS_PM0,	SSS_SHIFT },
	{ "ISP",	ISP_SS_PM0,	SSS_SHIFT },
	{ "MIO",	MIO_SS_PM,	SSS_SHIFT },
	{ NULL }
};

static const char * const dstates[] = {"D0", "D0i1", "D0i2", "D0i3"};

static int punit_dev_state_show(struct seq_file *seq_file, void *unused)
{
	u32 punit_pwr_status;
	struct punit_device *punit_devp = seq_file->private;
	int index;
	int status;

	seq_puts(seq_file, "\n\nPUNIT NORTH COMPLEX DEVICES :\n");
	while (punit_devp->name) {
		status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
				       punit_devp->reg, &punit_pwr_status);
		if (status) {
			seq_printf(seq_file, "%9s : Read Failed\n",
				   punit_devp->name);
		} else  {
			index = (punit_pwr_status >> punit_devp->sss_pos) & 3;
			seq_printf(seq_file, "%9s : %s\n", punit_devp->name,
				   dstates[index]);
		}
		punit_devp++;
	}

	return 0;
}
DEFINE_SHOW_ATTRIBUTE(punit_dev_state);

static struct dentry *punit_dbg_file;

static void punit_dbgfs_register(struct punit_device *punit_device)
{
	punit_dbg_file = debugfs_create_dir("punit_atom", NULL);

	debugfs_create_file("dev_power_state", 0444, punit_dbg_file,
			    punit_device, &punit_dev_state_fops);
}

static void punit_dbgfs_unregister(void)
{
	debugfs_remove_recursive(punit_dbg_file);
}

#define X86_MATCH(model, data)						 \
	X86_MATCH_VENDOR_FAM_MODEL_FEATURE(INTEL, 6, INTEL_FAM6_##model, \
					   X86_FEATURE_MWAIT, data)

static const struct x86_cpu_id intel_punit_cpu_ids[] = {
	X86_MATCH(ATOM_SILVERMONT,		&punit_device_byt),
	X86_MATCH(ATOM_SILVERMONT_MID,		&punit_device_tng),
	X86_MATCH(ATOM_AIRMONT,			&punit_device_cht),
	{}
};
MODULE_DEVICE_TABLE(x86cpu, intel_punit_cpu_ids);

static int __init punit_atom_debug_init(void)
{
	const struct x86_cpu_id *id;

	id = x86_match_cpu(intel_punit_cpu_ids);
	if (!id)
		return -ENODEV;

	punit_dbgfs_register((struct punit_device *)id->driver_data);

	return 0;
}

static void __exit punit_atom_debug_exit(void)
{
	punit_dbgfs_unregister();
}

module_init(punit_atom_debug_init);
module_exit(punit_atom_debug_exit);

MODULE_AUTHOR("Kumar P, Mahesh <mahesh.kumar.p@intel.com>");
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
MODULE_DESCRIPTION("Driver for Punit devices states debugging");
MODULE_LICENSE("GPL v2");