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2025cf9e | 1 | // SPDX-License-Identifier: GPL-2.0-only |
956079e0 SP |
2 | /* |
3 | * Intel SOC Punit device state debug driver | |
4 | * Punit controls power management for North Complex devices (Graphics | |
5 | * blocks, Image Signal Processing, video processing, display, DSP etc.) | |
6 | * | |
7 | * Copyright (c) 2015, Intel Corporation. | |
956079e0 SP |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/device.h> | |
13 | #include <linux/debugfs.h> | |
14 | #include <linux/seq_file.h> | |
15 | #include <linux/io.h> | |
16 | #include <asm/cpu_device_id.h> | |
d5e0c89a | 17 | #include <asm/intel-family.h> |
956079e0 SP |
18 | #include <asm/iosf_mbi.h> |
19 | ||
956079e0 SP |
20 | /* Subsystem config/status Video processor */ |
21 | #define VED_SS_PM0 0x32 | |
22 | /* Subsystem config/status ISP (Image Signal Processor) */ | |
23 | #define ISP_SS_PM0 0x39 | |
24 | /* Subsystem config/status Input/output controller */ | |
25 | #define MIO_SS_PM 0x3B | |
26 | /* Shift bits for getting status for video, isp and i/o */ | |
27 | #define SSS_SHIFT 24 | |
9485f8b6 AS |
28 | |
29 | /* Power gate status reg */ | |
30 | #define PWRGT_STATUS 0x61 | |
956079e0 SP |
31 | /* Shift bits for getting status for graphics rendering */ |
32 | #define RENDER_POS 0 | |
33 | /* Shift bits for getting status for media control */ | |
34 | #define MEDIA_POS 2 | |
35 | /* Shift bits for getting status for Valley View/Baytrail display */ | |
36 | #define VLV_DISPLAY_POS 6 | |
9485f8b6 | 37 | |
956079e0 SP |
38 | /* Subsystem config/status display for Cherry Trail SOC */ |
39 | #define CHT_DSP_SSS 0x36 | |
40 | /* Shift bits for getting status for display */ | |
41 | #define CHT_DSP_SSS_POS 16 | |
42 | ||
43 | struct punit_device { | |
44 | char *name; | |
45 | int reg; | |
46 | int sss_pos; | |
47 | }; | |
48 | ||
9485f8b6 AS |
49 | static const struct punit_device punit_device_tng[] = { |
50 | { "DISPLAY", CHT_DSP_SSS, SSS_SHIFT }, | |
51 | { "VED", VED_SS_PM0, SSS_SHIFT }, | |
52 | { "ISP", ISP_SS_PM0, SSS_SHIFT }, | |
53 | { "MIO", MIO_SS_PM, SSS_SHIFT }, | |
54 | { NULL } | |
55 | }; | |
56 | ||
956079e0 SP |
57 | static const struct punit_device punit_device_byt[] = { |
58 | { "GFX RENDER", PWRGT_STATUS, RENDER_POS }, | |
59 | { "GFX MEDIA", PWRGT_STATUS, MEDIA_POS }, | |
60 | { "DISPLAY", PWRGT_STATUS, VLV_DISPLAY_POS }, | |
61 | { "VED", VED_SS_PM0, SSS_SHIFT }, | |
62 | { "ISP", ISP_SS_PM0, SSS_SHIFT }, | |
63 | { "MIO", MIO_SS_PM, SSS_SHIFT }, | |
64 | { NULL } | |
65 | }; | |
66 | ||
67 | static const struct punit_device punit_device_cht[] = { | |
68 | { "GFX RENDER", PWRGT_STATUS, RENDER_POS }, | |
69 | { "GFX MEDIA", PWRGT_STATUS, MEDIA_POS }, | |
70 | { "DISPLAY", CHT_DSP_SSS, CHT_DSP_SSS_POS }, | |
71 | { "VED", VED_SS_PM0, SSS_SHIFT }, | |
72 | { "ISP", ISP_SS_PM0, SSS_SHIFT }, | |
73 | { "MIO", MIO_SS_PM, SSS_SHIFT }, | |
74 | { NULL } | |
75 | }; | |
76 | ||
77 | static const char * const dstates[] = {"D0", "D0i1", "D0i2", "D0i3"}; | |
78 | ||
79 | static int punit_dev_state_show(struct seq_file *seq_file, void *unused) | |
80 | { | |
81 | u32 punit_pwr_status; | |
82 | struct punit_device *punit_devp = seq_file->private; | |
83 | int index; | |
84 | int status; | |
85 | ||
86 | seq_puts(seq_file, "\n\nPUNIT NORTH COMPLEX DEVICES :\n"); | |
87 | while (punit_devp->name) { | |
4077a387 AS |
88 | status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ, |
89 | punit_devp->reg, &punit_pwr_status); | |
956079e0 SP |
90 | if (status) { |
91 | seq_printf(seq_file, "%9s : Read Failed\n", | |
92 | punit_devp->name); | |
93 | } else { | |
94 | index = (punit_pwr_status >> punit_devp->sss_pos) & 3; | |
95 | seq_printf(seq_file, "%9s : %s\n", punit_devp->name, | |
96 | dstates[index]); | |
97 | } | |
98 | punit_devp++; | |
99 | } | |
100 | ||
101 | return 0; | |
102 | } | |
3130451e | 103 | DEFINE_SHOW_ATTRIBUTE(punit_dev_state); |
956079e0 SP |
104 | |
105 | static struct dentry *punit_dbg_file; | |
106 | ||
107 | static int punit_dbgfs_register(struct punit_device *punit_device) | |
108 | { | |
f703fd37 | 109 | struct dentry *dev_state; |
956079e0 SP |
110 | |
111 | punit_dbg_file = debugfs_create_dir("punit_atom", NULL); | |
112 | if (!punit_dbg_file) | |
113 | return -ENXIO; | |
114 | ||
3130451e | 115 | dev_state = debugfs_create_file("dev_power_state", 0444, |
956079e0 | 116 | punit_dbg_file, punit_device, |
3130451e | 117 | &punit_dev_state_fops); |
956079e0 SP |
118 | if (!dev_state) { |
119 | pr_err("punit_dev_state register failed\n"); | |
120 | debugfs_remove(punit_dbg_file); | |
121 | return -ENXIO; | |
122 | } | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
127 | static void punit_dbgfs_unregister(void) | |
128 | { | |
129 | debugfs_remove_recursive(punit_dbg_file); | |
130 | } | |
131 | ||
132 | #define ICPU(model, drv_data) \ | |
133 | { X86_VENDOR_INTEL, 6, model, X86_FEATURE_MWAIT,\ | |
134 | (kernel_ulong_t)&drv_data } | |
135 | ||
136 | static const struct x86_cpu_id intel_punit_cpu_ids[] = { | |
f2c4db1b PZ |
137 | ICPU(INTEL_FAM6_ATOM_SILVERMONT, punit_device_byt), |
138 | ICPU(INTEL_FAM6_ATOM_SILVERMONT_MID, punit_device_tng), | |
d5e0c89a | 139 | ICPU(INTEL_FAM6_ATOM_AIRMONT, punit_device_cht), |
956079e0 SP |
140 | {} |
141 | }; | |
142 | ||
143 | MODULE_DEVICE_TABLE(x86cpu, intel_punit_cpu_ids); | |
144 | ||
145 | static int __init punit_atom_debug_init(void) | |
146 | { | |
147 | const struct x86_cpu_id *id; | |
148 | int ret; | |
149 | ||
150 | id = x86_match_cpu(intel_punit_cpu_ids); | |
151 | if (!id) | |
152 | return -ENODEV; | |
153 | ||
154 | ret = punit_dbgfs_register((struct punit_device *)id->driver_data); | |
155 | if (ret < 0) | |
156 | return ret; | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
161 | static void __exit punit_atom_debug_exit(void) | |
162 | { | |
163 | punit_dbgfs_unregister(); | |
164 | } | |
165 | ||
166 | module_init(punit_atom_debug_init); | |
167 | module_exit(punit_atom_debug_exit); | |
168 | ||
169 | MODULE_AUTHOR("Kumar P, Mahesh <mahesh.kumar.p@intel.com>"); | |
170 | MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); | |
171 | MODULE_DESCRIPTION("Driver for Punit devices states debugging"); | |
172 | MODULE_LICENSE("GPL v2"); |