Srinivas Pandruvada | 956079e | 2015-05-06 12:15:54 -0700 | [diff] [blame] | 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> |
Dave Hansen | d5e0c89 | 2016-06-02 17:19:39 -0700 | [diff] [blame] | 26 | #include <asm/intel-family.h> |
Srinivas Pandruvada | 956079e | 2015-05-06 12:15:54 -0700 | [diff] [blame] | 27 | #include <asm/iosf_mbi.h> |
| 28 | |
Srinivas Pandruvada | 956079e | 2015-05-06 12:15:54 -0700 | [diff] [blame] | 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 |
Andy Shevchenko | 9485f8b | 2016-06-13 21:28:01 +0300 | [diff] [blame] | 37 | |
| 38 | /* Power gate status reg */ |
| 39 | #define PWRGT_STATUS 0x61 |
Srinivas Pandruvada | 956079e | 2015-05-06 12:15:54 -0700 | [diff] [blame] | 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 |
Andy Shevchenko | 9485f8b | 2016-06-13 21:28:01 +0300 | [diff] [blame] | 46 | |
Srinivas Pandruvada | 956079e | 2015-05-06 12:15:54 -0700 | [diff] [blame] | 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 | |
Andy Shevchenko | 9485f8b | 2016-06-13 21:28:01 +0300 | [diff] [blame] | 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 | |
Srinivas Pandruvada | 956079e | 2015-05-06 12:15:54 -0700 | [diff] [blame] | 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) { |
Andy Shevchenko | 4077a38 | 2015-11-11 19:59:29 +0200 | [diff] [blame] | 97 | status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ, |
| 98 | punit_devp->reg, &punit_pwr_status); |
Srinivas Pandruvada | 956079e | 2015-05-06 12:15:54 -0700 | [diff] [blame] | 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[] = { |
Dave Hansen | d5e0c89 | 2016-06-02 17:19:39 -0700 | [diff] [blame] | 157 | ICPU(INTEL_FAM6_ATOM_SILVERMONT1, punit_device_byt), |
Andy Shevchenko | 9485f8b | 2016-06-13 21:28:01 +0300 | [diff] [blame] | 158 | ICPU(INTEL_FAM6_ATOM_MERRIFIELD1, punit_device_tng), |
Dave Hansen | d5e0c89 | 2016-06-02 17:19:39 -0700 | [diff] [blame] | 159 | ICPU(INTEL_FAM6_ATOM_AIRMONT, punit_device_cht), |
Srinivas Pandruvada | 956079e | 2015-05-06 12:15:54 -0700 | [diff] [blame] | 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"); |