1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 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.) 6 * 7 * Copyright (c) 2015, Intel Corporation. 8 */ 9 10 #include <linux/module.h> 11 #include <linux/init.h> 12 #include <linux/device.h> 13 #include <linux/debugfs.h> 14 #include <linux/seq_file.h> 15 #include <linux/io.h> 16 #include <asm/cpu_device_id.h> 17 #include <asm/intel-family.h> 18 #include <asm/iosf_mbi.h> 19 20 /* Subsystem config/status Video processor */ 21 #define VED_SS_PM0 0x32 22 /* Subsystem config/status ISP (Image Signal Processor) */ 23 #define ISP_SS_PM0 0x39 24 /* Subsystem config/status Input/output controller */ 25 #define MIO_SS_PM 0x3B 26 /* Shift bits for getting status for video, isp and i/o */ 27 #define SSS_SHIFT 24 28 29 /* Power gate status reg */ 30 #define PWRGT_STATUS 0x61 31 /* Shift bits for getting status for graphics rendering */ 32 #define RENDER_POS 0 33 /* Shift bits for getting status for media control */ 34 #define MEDIA_POS 2 35 /* Shift bits for getting status for Valley View/Baytrail display */ 36 #define VLV_DISPLAY_POS 6 37 38 /* Subsystem config/status display for Cherry Trail SOC */ 39 #define CHT_DSP_SSS 0x36 40 /* Shift bits for getting status for display */ 41 #define CHT_DSP_SSS_POS 16 42 43 struct punit_device { 44 char *name; 45 int reg; 46 int sss_pos; 47 }; 48 49 static const struct punit_device punit_device_tng[] = { 50 { "DISPLAY", CHT_DSP_SSS, SSS_SHIFT }, 51 { "VED", VED_SS_PM0, SSS_SHIFT }, 52 { "ISP", ISP_SS_PM0, SSS_SHIFT }, 53 { "MIO", MIO_SS_PM, SSS_SHIFT }, 54 { NULL } 55 }; 56 57 static const struct punit_device punit_device_byt[] = { 58 { "GFX RENDER", PWRGT_STATUS, RENDER_POS }, 59 { "GFX MEDIA", PWRGT_STATUS, MEDIA_POS }, 60 { "DISPLAY", PWRGT_STATUS, VLV_DISPLAY_POS }, 61 { "VED", VED_SS_PM0, SSS_SHIFT }, 62 { "ISP", ISP_SS_PM0, SSS_SHIFT }, 63 { "MIO", MIO_SS_PM, SSS_SHIFT }, 64 { NULL } 65 }; 66 67 static const struct punit_device punit_device_cht[] = { 68 { "GFX RENDER", PWRGT_STATUS, RENDER_POS }, 69 { "GFX MEDIA", PWRGT_STATUS, MEDIA_POS }, 70 { "DISPLAY", CHT_DSP_SSS, CHT_DSP_SSS_POS }, 71 { "VED", VED_SS_PM0, SSS_SHIFT }, 72 { "ISP", ISP_SS_PM0, SSS_SHIFT }, 73 { "MIO", MIO_SS_PM, SSS_SHIFT }, 74 { NULL } 75 }; 76 77 static const char * const dstates[] = {"D0", "D0i1", "D0i2", "D0i3"}; 78 79 static int punit_dev_state_show(struct seq_file *seq_file, void *unused) 80 { 81 u32 punit_pwr_status; 82 struct punit_device *punit_devp = seq_file->private; 83 int index; 84 int status; 85 86 seq_puts(seq_file, "\n\nPUNIT NORTH COMPLEX DEVICES :\n"); 87 while (punit_devp->name) { 88 status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ, 89 punit_devp->reg, &punit_pwr_status); 90 if (status) { 91 seq_printf(seq_file, "%9s : Read Failed\n", 92 punit_devp->name); 93 } else { 94 index = (punit_pwr_status >> punit_devp->sss_pos) & 3; 95 seq_printf(seq_file, "%9s : %s\n", punit_devp->name, 96 dstates[index]); 97 } 98 punit_devp++; 99 } 100 101 return 0; 102 } 103 DEFINE_SHOW_ATTRIBUTE(punit_dev_state); 104 105 static struct dentry *punit_dbg_file; 106 107 static void punit_dbgfs_register(struct punit_device *punit_device) 108 { 109 punit_dbg_file = debugfs_create_dir("punit_atom", NULL); 110 111 debugfs_create_file("dev_power_state", 0444, punit_dbg_file, 112 punit_device, &punit_dev_state_fops); 113 } 114 115 static void punit_dbgfs_unregister(void) 116 { 117 debugfs_remove_recursive(punit_dbg_file); 118 } 119 120 #define X86_MATCH(model, data) \ 121 X86_MATCH_VENDOR_FAM_MODEL_FEATURE(INTEL, 6, INTEL_FAM6_##model, \ 122 X86_FEATURE_MWAIT, data) 123 124 static const struct x86_cpu_id intel_punit_cpu_ids[] = { 125 X86_MATCH(ATOM_SILVERMONT, &punit_device_byt), 126 X86_MATCH(ATOM_SILVERMONT_MID, &punit_device_tng), 127 X86_MATCH(ATOM_AIRMONT, &punit_device_cht), 128 {} 129 }; 130 MODULE_DEVICE_TABLE(x86cpu, intel_punit_cpu_ids); 131 132 static int __init punit_atom_debug_init(void) 133 { 134 const struct x86_cpu_id *id; 135 136 id = x86_match_cpu(intel_punit_cpu_ids); 137 if (!id) 138 return -ENODEV; 139 140 punit_dbgfs_register((struct punit_device *)id->driver_data); 141 142 return 0; 143 } 144 145 static void __exit punit_atom_debug_exit(void) 146 { 147 punit_dbgfs_unregister(); 148 } 149 150 module_init(punit_atom_debug_init); 151 module_exit(punit_atom_debug_exit); 152 153 MODULE_AUTHOR("Kumar P, Mahesh <mahesh.kumar.p@intel.com>"); 154 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); 155 MODULE_DESCRIPTION("Driver for Punit devices states debugging"); 156 MODULE_LICENSE("GPL v2"); 157