1 // SPDX-License-Identifier: GPL-2.0-only
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.)
7 * Copyright (c) 2015, Intel Corporation.
10 #define pr_fmt(fmt) "punit_atom: " fmt
12 #include <linux/acpi.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/device.h>
16 #include <linux/debugfs.h>
17 #include <linux/seq_file.h>
19 #include <asm/cpu_device_id.h>
20 #include <asm/intel-family.h>
21 #include <asm/iosf_mbi.h>
23 /* Subsystem config/status Video processor */
24 #define VED_SS_PM0 0x32
25 /* Subsystem config/status ISP (Image Signal Processor) */
26 #define ISP_SS_PM0 0x39
27 /* Subsystem config/status Input/output controller */
28 #define MIO_SS_PM 0x3B
29 /* Shift bits for getting status for video, isp and i/o */
32 /* Power gate status reg */
33 #define PWRGT_STATUS 0x61
34 /* Shift bits for getting status for graphics rendering */
36 /* Shift bits for getting status for media control */
38 /* Shift bits for getting status for Valley View/Baytrail display */
39 #define VLV_DISPLAY_POS 6
41 /* Subsystem config/status display for Cherry Trail SOC */
42 #define CHT_DSP_SSS 0x36
43 /* Shift bits for getting status for display */
44 #define CHT_DSP_SSS_POS 16
52 static const struct punit_device punit_device_tng[] = {
53 { "DISPLAY", CHT_DSP_SSS, SSS_SHIFT },
54 { "VED", VED_SS_PM0, SSS_SHIFT },
55 { "ISP", ISP_SS_PM0, SSS_SHIFT },
56 { "MIO", MIO_SS_PM, SSS_SHIFT },
60 static const struct punit_device punit_device_byt[] = {
61 { "GFX RENDER", PWRGT_STATUS, RENDER_POS },
62 { "GFX MEDIA", PWRGT_STATUS, MEDIA_POS },
63 { "DISPLAY", PWRGT_STATUS, VLV_DISPLAY_POS },
64 { "VED", VED_SS_PM0, SSS_SHIFT },
65 { "ISP", ISP_SS_PM0, SSS_SHIFT },
66 { "MIO", MIO_SS_PM, SSS_SHIFT },
70 static const struct punit_device punit_device_cht[] = {
71 { "GFX RENDER", PWRGT_STATUS, RENDER_POS },
72 { "GFX MEDIA", PWRGT_STATUS, MEDIA_POS },
73 { "DISPLAY", CHT_DSP_SSS, CHT_DSP_SSS_POS },
74 { "VED", VED_SS_PM0, SSS_SHIFT },
75 { "ISP", ISP_SS_PM0, SSS_SHIFT },
76 { "MIO", MIO_SS_PM, SSS_SHIFT },
80 static const char * const dstates[] = {"D0", "D0i1", "D0i2", "D0i3"};
82 static int punit_dev_state_show(struct seq_file *seq_file, void *unused)
85 struct punit_device *punit_devp = seq_file->private;
89 seq_puts(seq_file, "\n\nPUNIT NORTH COMPLEX DEVICES :\n");
90 while (punit_devp->name) {
91 status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
92 punit_devp->reg, &punit_pwr_status);
94 seq_printf(seq_file, "%9s : Read Failed\n",
97 index = (punit_pwr_status >> punit_devp->sss_pos) & 3;
98 seq_printf(seq_file, "%9s : %s\n", punit_devp->name,
106 DEFINE_SHOW_ATTRIBUTE(punit_dev_state);
108 static struct dentry *punit_dbg_file;
110 static void punit_dbgfs_register(struct punit_device *punit_device)
112 punit_dbg_file = debugfs_create_dir("punit_atom", NULL);
114 debugfs_create_file("dev_power_state", 0444, punit_dbg_file,
115 punit_device, &punit_dev_state_fops);
118 static void punit_dbgfs_unregister(void)
120 debugfs_remove_recursive(punit_dbg_file);
123 #if defined(CONFIG_ACPI) && defined(CONFIG_SUSPEND)
124 static const struct punit_device *punit_dev;
126 static void punit_s2idle_check(void)
128 const struct punit_device *punit_devp;
129 u32 punit_pwr_status, dstate;
132 for (punit_devp = punit_dev; punit_devp->name; punit_devp++) {
133 /* Skip MIO, it is on till the very last moment */
134 if (punit_devp->reg == MIO_SS_PM)
137 status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
138 punit_devp->reg, &punit_pwr_status);
140 pr_err("%s read failed\n", punit_devp->name);
142 dstate = (punit_pwr_status >> punit_devp->sss_pos) & 3;
144 pr_err("%s is in D0 prior to s2idle\n", punit_devp->name);
149 static struct acpi_s2idle_dev_ops punit_s2idle_ops = {
150 .check = punit_s2idle_check,
153 static void punit_s2idle_check_register(struct punit_device *punit_device)
155 punit_dev = punit_device;
156 acpi_register_lps0_dev(&punit_s2idle_ops);
159 static void punit_s2idle_check_unregister(void)
161 acpi_unregister_lps0_dev(&punit_s2idle_ops);
164 static void punit_s2idle_check_register(struct punit_device *punit_device) {}
165 static void punit_s2idle_check_unregister(void) {}
168 #define X86_MATCH(model, data) \
169 X86_MATCH_VENDOR_FAM_MODEL_FEATURE(INTEL, 6, INTEL_FAM6_##model, \
170 X86_FEATURE_MWAIT, data)
172 static const struct x86_cpu_id intel_punit_cpu_ids[] = {
173 X86_MATCH(ATOM_SILVERMONT, &punit_device_byt),
174 X86_MATCH(ATOM_SILVERMONT_MID, &punit_device_tng),
175 X86_MATCH(ATOM_AIRMONT, &punit_device_cht),
178 MODULE_DEVICE_TABLE(x86cpu, intel_punit_cpu_ids);
180 static int __init punit_atom_debug_init(void)
182 struct punit_device *punit_device;
183 const struct x86_cpu_id *id;
185 id = x86_match_cpu(intel_punit_cpu_ids);
189 punit_device = (struct punit_device *)id->driver_data;
190 punit_dbgfs_register(punit_device);
191 punit_s2idle_check_register(punit_device);
196 static void __exit punit_atom_debug_exit(void)
198 punit_s2idle_check_unregister();
199 punit_dbgfs_unregister();
202 module_init(punit_atom_debug_init);
203 module_exit(punit_atom_debug_exit);
207 MODULE_DESCRIPTION("Driver for Punit devices states debugging");
208 MODULE_LICENSE("GPL v2");