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> 26 #include <asm/intel-family.h> 27 #include <asm/iosf_mbi.h> 28 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 37 38 /* Power gate status reg */ 39 #define PWRGT_STATUS 0x61 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 46 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 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 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) { 97 status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ, 98 punit_devp->reg, &punit_pwr_status); 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 DEFINE_SHOW_ATTRIBUTE(punit_dev_state); 113 114 static struct dentry *punit_dbg_file; 115 116 static int punit_dbgfs_register(struct punit_device *punit_device) 117 { 118 static struct dentry *dev_state; 119 120 punit_dbg_file = debugfs_create_dir("punit_atom", NULL); 121 if (!punit_dbg_file) 122 return -ENXIO; 123 124 dev_state = debugfs_create_file("dev_power_state", 0444, 125 punit_dbg_file, punit_device, 126 &punit_dev_state_fops); 127 if (!dev_state) { 128 pr_err("punit_dev_state register failed\n"); 129 debugfs_remove(punit_dbg_file); 130 return -ENXIO; 131 } 132 133 return 0; 134 } 135 136 static void punit_dbgfs_unregister(void) 137 { 138 debugfs_remove_recursive(punit_dbg_file); 139 } 140 141 #define ICPU(model, drv_data) \ 142 { X86_VENDOR_INTEL, 6, model, X86_FEATURE_MWAIT,\ 143 (kernel_ulong_t)&drv_data } 144 145 static const struct x86_cpu_id intel_punit_cpu_ids[] = { 146 ICPU(INTEL_FAM6_ATOM_SILVERMONT1, punit_device_byt), 147 ICPU(INTEL_FAM6_ATOM_MERRIFIELD, punit_device_tng), 148 ICPU(INTEL_FAM6_ATOM_AIRMONT, punit_device_cht), 149 {} 150 }; 151 152 MODULE_DEVICE_TABLE(x86cpu, intel_punit_cpu_ids); 153 154 static int __init punit_atom_debug_init(void) 155 { 156 const struct x86_cpu_id *id; 157 int ret; 158 159 id = x86_match_cpu(intel_punit_cpu_ids); 160 if (!id) 161 return -ENODEV; 162 163 ret = punit_dbgfs_register((struct punit_device *)id->driver_data); 164 if (ret < 0) 165 return ret; 166 167 return 0; 168 } 169 170 static void __exit punit_atom_debug_exit(void) 171 { 172 punit_dbgfs_unregister(); 173 } 174 175 module_init(punit_atom_debug_init); 176 module_exit(punit_atom_debug_exit); 177 178 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"); 182