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.)
6 * Copyright (c) 2015, Intel Corporation.
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.
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
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>
25 #include <asm/cpu_device_id.h>
26 #include <asm/intel-family.h>
27 #include <asm/iosf_mbi.h>
29 /* Power gate status reg */
30 #define PWRGT_STATUS 0x61
31 /* Subsystem config/status Video processor */
32 #define VED_SS_PM0 0x32
33 /* Subsystem config/status ISP (Image Signal Processor) */
34 #define ISP_SS_PM0 0x39
35 /* Subsystem config/status Input/output controller */
36 #define MIO_SS_PM 0x3B
37 /* Shift bits for getting status for video, isp and i/o */
39 /* Shift bits for getting status for graphics rendering */
41 /* Shift bits for getting status for media control */
43 /* Shift bits for getting status for Valley View/Baytrail display */
44 #define VLV_DISPLAY_POS 6
45 /* Subsystem config/status display for Cherry Trail SOC */
46 #define CHT_DSP_SSS 0x36
47 /* Shift bits for getting status for display */
48 #define CHT_DSP_SSS_POS 16
56 static const struct punit_device punit_device_byt[] = {
57 { "GFX RENDER", PWRGT_STATUS, RENDER_POS },
58 { "GFX MEDIA", PWRGT_STATUS, MEDIA_POS },
59 { "DISPLAY", PWRGT_STATUS, VLV_DISPLAY_POS },
60 { "VED", VED_SS_PM0, SSS_SHIFT },
61 { "ISP", ISP_SS_PM0, SSS_SHIFT },
62 { "MIO", MIO_SS_PM, SSS_SHIFT },
66 static const struct punit_device punit_device_cht[] = {
67 { "GFX RENDER", PWRGT_STATUS, RENDER_POS },
68 { "GFX MEDIA", PWRGT_STATUS, MEDIA_POS },
69 { "DISPLAY", CHT_DSP_SSS, CHT_DSP_SSS_POS },
70 { "VED", VED_SS_PM0, SSS_SHIFT },
71 { "ISP", ISP_SS_PM0, SSS_SHIFT },
72 { "MIO", MIO_SS_PM, SSS_SHIFT },
76 static const char * const dstates[] = {"D0", "D0i1", "D0i2", "D0i3"};
78 static int punit_dev_state_show(struct seq_file *seq_file, void *unused)
81 struct punit_device *punit_devp = seq_file->private;
85 seq_puts(seq_file, "\n\nPUNIT NORTH COMPLEX DEVICES :\n");
86 while (punit_devp->name) {
87 status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
88 punit_devp->reg, &punit_pwr_status);
90 seq_printf(seq_file, "%9s : Read Failed\n",
93 index = (punit_pwr_status >> punit_devp->sss_pos) & 3;
94 seq_printf(seq_file, "%9s : %s\n", punit_devp->name,
103 static int punit_dev_state_open(struct inode *inode, struct file *file)
105 return single_open(file, punit_dev_state_show, inode->i_private);
108 static const struct file_operations punit_dev_state_ops = {
109 .open = punit_dev_state_open,
112 .release = single_release,
115 static struct dentry *punit_dbg_file;
117 static int punit_dbgfs_register(struct punit_device *punit_device)
119 static struct dentry *dev_state;
121 punit_dbg_file = debugfs_create_dir("punit_atom", NULL);
125 dev_state = debugfs_create_file("dev_power_state", S_IFREG | S_IRUGO,
126 punit_dbg_file, punit_device,
127 &punit_dev_state_ops);
129 pr_err("punit_dev_state register failed\n");
130 debugfs_remove(punit_dbg_file);
137 static void punit_dbgfs_unregister(void)
139 debugfs_remove_recursive(punit_dbg_file);
142 #define ICPU(model, drv_data) \
143 { X86_VENDOR_INTEL, 6, model, X86_FEATURE_MWAIT,\
144 (kernel_ulong_t)&drv_data }
146 static const struct x86_cpu_id intel_punit_cpu_ids[] = {
147 ICPU(INTEL_FAM6_ATOM_SILVERMONT1, punit_device_byt),
148 ICPU(INTEL_FAM6_ATOM_AIRMONT, punit_device_cht),
152 MODULE_DEVICE_TABLE(x86cpu, intel_punit_cpu_ids);
154 static int __init punit_atom_debug_init(void)
156 const struct x86_cpu_id *id;
159 id = x86_match_cpu(intel_punit_cpu_ids);
163 ret = punit_dbgfs_register((struct punit_device *)id->driver_data);
170 static void __exit punit_atom_debug_exit(void)
172 punit_dbgfs_unregister();
175 module_init(punit_atom_debug_init);
176 module_exit(punit_atom_debug_exit);
178 MODULE_AUTHOR("Kumar P, Mahesh <mahesh.kumar.p@intel.com>");
179 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
180 MODULE_DESCRIPTION("Driver for Punit devices states debugging");
181 MODULE_LICENSE("GPL v2");