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/iosf_mbi.h> 27 28 /* Power gate status reg */ 29 #define PWRGT_STATUS 0x61 30 /* Subsystem config/status Video processor */ 31 #define VED_SS_PM0 0x32 32 /* Subsystem config/status ISP (Image Signal Processor) */ 33 #define ISP_SS_PM0 0x39 34 /* Subsystem config/status Input/output controller */ 35 #define MIO_SS_PM 0x3B 36 /* Shift bits for getting status for video, isp and i/o */ 37 #define SSS_SHIFT 24 38 /* Shift bits for getting status for graphics rendering */ 39 #define RENDER_POS 0 40 /* Shift bits for getting status for media control */ 41 #define MEDIA_POS 2 42 /* Shift bits for getting status for Valley View/Baytrail display */ 43 #define VLV_DISPLAY_POS 6 44 /* Subsystem config/status display for Cherry Trail SOC */ 45 #define CHT_DSP_SSS 0x36 46 /* Shift bits for getting status for display */ 47 #define CHT_DSP_SSS_POS 16 48 49 struct punit_device { 50 char *name; 51 int reg; 52 int sss_pos; 53 }; 54 55 static const struct punit_device punit_device_byt[] = { 56 { "GFX RENDER", PWRGT_STATUS, RENDER_POS }, 57 { "GFX MEDIA", PWRGT_STATUS, MEDIA_POS }, 58 { "DISPLAY", PWRGT_STATUS, VLV_DISPLAY_POS }, 59 { "VED", VED_SS_PM0, SSS_SHIFT }, 60 { "ISP", ISP_SS_PM0, SSS_SHIFT }, 61 { "MIO", MIO_SS_PM, SSS_SHIFT }, 62 { NULL } 63 }; 64 65 static const struct punit_device punit_device_cht[] = { 66 { "GFX RENDER", PWRGT_STATUS, RENDER_POS }, 67 { "GFX MEDIA", PWRGT_STATUS, MEDIA_POS }, 68 { "DISPLAY", CHT_DSP_SSS, CHT_DSP_SSS_POS }, 69 { "VED", VED_SS_PM0, SSS_SHIFT }, 70 { "ISP", ISP_SS_PM0, SSS_SHIFT }, 71 { "MIO", MIO_SS_PM, SSS_SHIFT }, 72 { NULL } 73 }; 74 75 static const char * const dstates[] = {"D0", "D0i1", "D0i2", "D0i3"}; 76 77 static int punit_dev_state_show(struct seq_file *seq_file, void *unused) 78 { 79 u32 punit_pwr_status; 80 struct punit_device *punit_devp = seq_file->private; 81 int index; 82 int status; 83 84 seq_puts(seq_file, "\n\nPUNIT NORTH COMPLEX DEVICES :\n"); 85 while (punit_devp->name) { 86 status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ, 87 punit_devp->reg, &punit_pwr_status); 88 if (status) { 89 seq_printf(seq_file, "%9s : Read Failed\n", 90 punit_devp->name); 91 } else { 92 index = (punit_pwr_status >> punit_devp->sss_pos) & 3; 93 seq_printf(seq_file, "%9s : %s\n", punit_devp->name, 94 dstates[index]); 95 } 96 punit_devp++; 97 } 98 99 return 0; 100 } 101 102 static int punit_dev_state_open(struct inode *inode, struct file *file) 103 { 104 return single_open(file, punit_dev_state_show, inode->i_private); 105 } 106 107 static const struct file_operations punit_dev_state_ops = { 108 .open = punit_dev_state_open, 109 .read = seq_read, 110 .llseek = seq_lseek, 111 .release = single_release, 112 }; 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", S_IFREG | S_IRUGO, 125 punit_dbg_file, punit_device, 126 &punit_dev_state_ops); 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(55, punit_device_byt), /* Valleyview, Bay Trail */ 147 ICPU(76, punit_device_cht), /* Braswell, Cherry Trail */ 148 {} 149 }; 150 151 MODULE_DEVICE_TABLE(x86cpu, intel_punit_cpu_ids); 152 153 static int __init punit_atom_debug_init(void) 154 { 155 const struct x86_cpu_id *id; 156 int ret; 157 158 id = x86_match_cpu(intel_punit_cpu_ids); 159 if (!id) 160 return -ENODEV; 161 162 ret = punit_dbgfs_register((struct punit_device *)id->driver_data); 163 if (ret < 0) 164 return ret; 165 166 return 0; 167 } 168 169 static void __exit punit_atom_debug_exit(void) 170 { 171 punit_dbgfs_unregister(); 172 } 173 174 module_init(punit_atom_debug_init); 175 module_exit(punit_atom_debug_exit); 176 177 MODULE_AUTHOR("Kumar P, Mahesh <mahesh.kumar.p@intel.com>"); 178 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); 179 MODULE_DESCRIPTION("Driver for Punit devices states debugging"); 180 MODULE_LICENSE("GPL v2"); 181