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956079e0 SP |
1 | /* |
2 | * Intel SOC Punit device state debug driver | |
3 | * Punit controls power management for North Complex devices (Graphics | |
4 | * blocks, Image Signal Processing, video processing, display, DSP etc.) | |
5 | * | |
6 | * Copyright (c) 2015, Intel Corporation. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms and conditions of the GNU General Public License, | |
10 | * version 2, as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope it will be useful, but WITHOUT | |
13 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
15 | * more details. | |
16 | * | |
17 | */ | |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/device.h> | |
22 | #include <linux/debugfs.h> | |
23 | #include <linux/seq_file.h> | |
24 | #include <linux/io.h> | |
25 | #include <asm/cpu_device_id.h> | |
d5e0c89a | 26 | #include <asm/intel-family.h> |
956079e0 SP |
27 | #include <asm/iosf_mbi.h> |
28 | ||
956079e0 SP |
29 | /* Subsystem config/status Video processor */ |
30 | #define VED_SS_PM0 0x32 | |
31 | /* Subsystem config/status ISP (Image Signal Processor) */ | |
32 | #define ISP_SS_PM0 0x39 | |
33 | /* Subsystem config/status Input/output controller */ | |
34 | #define MIO_SS_PM 0x3B | |
35 | /* Shift bits for getting status for video, isp and i/o */ | |
36 | #define SSS_SHIFT 24 | |
9485f8b6 AS |
37 | |
38 | /* Power gate status reg */ | |
39 | #define PWRGT_STATUS 0x61 | |
956079e0 SP |
40 | /* Shift bits for getting status for graphics rendering */ |
41 | #define RENDER_POS 0 | |
42 | /* Shift bits for getting status for media control */ | |
43 | #define MEDIA_POS 2 | |
44 | /* Shift bits for getting status for Valley View/Baytrail display */ | |
45 | #define VLV_DISPLAY_POS 6 | |
9485f8b6 | 46 | |
956079e0 SP |
47 | /* Subsystem config/status display for Cherry Trail SOC */ |
48 | #define CHT_DSP_SSS 0x36 | |
49 | /* Shift bits for getting status for display */ | |
50 | #define CHT_DSP_SSS_POS 16 | |
51 | ||
52 | struct punit_device { | |
53 | char *name; | |
54 | int reg; | |
55 | int sss_pos; | |
56 | }; | |
57 | ||
9485f8b6 AS |
58 | static const struct punit_device punit_device_tng[] = { |
59 | { "DISPLAY", CHT_DSP_SSS, SSS_SHIFT }, | |
60 | { "VED", VED_SS_PM0, SSS_SHIFT }, | |
61 | { "ISP", ISP_SS_PM0, SSS_SHIFT }, | |
62 | { "MIO", MIO_SS_PM, SSS_SHIFT }, | |
63 | { NULL } | |
64 | }; | |
65 | ||
956079e0 SP |
66 | static const struct punit_device punit_device_byt[] = { |
67 | { "GFX RENDER", PWRGT_STATUS, RENDER_POS }, | |
68 | { "GFX MEDIA", PWRGT_STATUS, MEDIA_POS }, | |
69 | { "DISPLAY", PWRGT_STATUS, VLV_DISPLAY_POS }, | |
70 | { "VED", VED_SS_PM0, SSS_SHIFT }, | |
71 | { "ISP", ISP_SS_PM0, SSS_SHIFT }, | |
72 | { "MIO", MIO_SS_PM, SSS_SHIFT }, | |
73 | { NULL } | |
74 | }; | |
75 | ||
76 | static const struct punit_device punit_device_cht[] = { | |
77 | { "GFX RENDER", PWRGT_STATUS, RENDER_POS }, | |
78 | { "GFX MEDIA", PWRGT_STATUS, MEDIA_POS }, | |
79 | { "DISPLAY", CHT_DSP_SSS, CHT_DSP_SSS_POS }, | |
80 | { "VED", VED_SS_PM0, SSS_SHIFT }, | |
81 | { "ISP", ISP_SS_PM0, SSS_SHIFT }, | |
82 | { "MIO", MIO_SS_PM, SSS_SHIFT }, | |
83 | { NULL } | |
84 | }; | |
85 | ||
86 | static const char * const dstates[] = {"D0", "D0i1", "D0i2", "D0i3"}; | |
87 | ||
88 | static int punit_dev_state_show(struct seq_file *seq_file, void *unused) | |
89 | { | |
90 | u32 punit_pwr_status; | |
91 | struct punit_device *punit_devp = seq_file->private; | |
92 | int index; | |
93 | int status; | |
94 | ||
95 | seq_puts(seq_file, "\n\nPUNIT NORTH COMPLEX DEVICES :\n"); | |
96 | while (punit_devp->name) { | |
4077a387 AS |
97 | status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ, |
98 | punit_devp->reg, &punit_pwr_status); | |
956079e0 SP |
99 | if (status) { |
100 | seq_printf(seq_file, "%9s : Read Failed\n", | |
101 | punit_devp->name); | |
102 | } else { | |
103 | index = (punit_pwr_status >> punit_devp->sss_pos) & 3; | |
104 | seq_printf(seq_file, "%9s : %s\n", punit_devp->name, | |
105 | dstates[index]); | |
106 | } | |
107 | punit_devp++; | |
108 | } | |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
113 | static int punit_dev_state_open(struct inode *inode, struct file *file) | |
114 | { | |
115 | return single_open(file, punit_dev_state_show, inode->i_private); | |
116 | } | |
117 | ||
118 | static const struct file_operations punit_dev_state_ops = { | |
119 | .open = punit_dev_state_open, | |
120 | .read = seq_read, | |
121 | .llseek = seq_lseek, | |
122 | .release = single_release, | |
123 | }; | |
124 | ||
125 | static struct dentry *punit_dbg_file; | |
126 | ||
127 | static int punit_dbgfs_register(struct punit_device *punit_device) | |
128 | { | |
129 | static struct dentry *dev_state; | |
130 | ||
131 | punit_dbg_file = debugfs_create_dir("punit_atom", NULL); | |
132 | if (!punit_dbg_file) | |
133 | return -ENXIO; | |
134 | ||
135 | dev_state = debugfs_create_file("dev_power_state", S_IFREG | S_IRUGO, | |
136 | punit_dbg_file, punit_device, | |
137 | &punit_dev_state_ops); | |
138 | if (!dev_state) { | |
139 | pr_err("punit_dev_state register failed\n"); | |
140 | debugfs_remove(punit_dbg_file); | |
141 | return -ENXIO; | |
142 | } | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
147 | static void punit_dbgfs_unregister(void) | |
148 | { | |
149 | debugfs_remove_recursive(punit_dbg_file); | |
150 | } | |
151 | ||
152 | #define ICPU(model, drv_data) \ | |
153 | { X86_VENDOR_INTEL, 6, model, X86_FEATURE_MWAIT,\ | |
154 | (kernel_ulong_t)&drv_data } | |
155 | ||
156 | static const struct x86_cpu_id intel_punit_cpu_ids[] = { | |
d5e0c89a | 157 | ICPU(INTEL_FAM6_ATOM_SILVERMONT1, punit_device_byt), |
70c6cb0f | 158 | ICPU(INTEL_FAM6_ATOM_MERRIFIELD, punit_device_tng), |
d5e0c89a | 159 | ICPU(INTEL_FAM6_ATOM_AIRMONT, punit_device_cht), |
956079e0 SP |
160 | {} |
161 | }; | |
162 | ||
163 | MODULE_DEVICE_TABLE(x86cpu, intel_punit_cpu_ids); | |
164 | ||
165 | static int __init punit_atom_debug_init(void) | |
166 | { | |
167 | const struct x86_cpu_id *id; | |
168 | int ret; | |
169 | ||
170 | id = x86_match_cpu(intel_punit_cpu_ids); | |
171 | if (!id) | |
172 | return -ENODEV; | |
173 | ||
174 | ret = punit_dbgfs_register((struct punit_device *)id->driver_data); | |
175 | if (ret < 0) | |
176 | return ret; | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
181 | static void __exit punit_atom_debug_exit(void) | |
182 | { | |
183 | punit_dbgfs_unregister(); | |
184 | } | |
185 | ||
186 | module_init(punit_atom_debug_init); | |
187 | module_exit(punit_atom_debug_exit); | |
188 | ||
189 | MODULE_AUTHOR("Kumar P, Mahesh <mahesh.kumar.p@intel.com>"); | |
190 | MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); | |
191 | MODULE_DESCRIPTION("Driver for Punit devices states debugging"); | |
192 | MODULE_LICENSE("GPL v2"); |