1 // SPDX-License-Identifier: GPL-2.0-only 2 // Copyright(c) 2023 Intel Corporation 3 4 #include <linux/acpi.h> 5 #include <linux/debugfs.h> 6 #include <linux/delay.h> 7 #include <linux/device.h> 8 #include <linux/io.h> 9 #include <linux/pm_runtime.h> 10 #include <linux/soundwire/sdw.h> 11 #include <linux/soundwire/sdw_intel.h> 12 #include <linux/soundwire/sdw_registers.h> 13 #include "bus.h" 14 #include "cadence_master.h" 15 #include "intel.h" 16 17 /* 18 * debugfs 19 */ 20 #ifdef CONFIG_DEBUG_FS 21 22 #define RD_BUF (2 * PAGE_SIZE) 23 24 static ssize_t intel_sprintf(void __iomem *mem, bool l, 25 char *buf, size_t pos, unsigned int reg) 26 { 27 int value; 28 29 if (l) 30 value = intel_readl(mem, reg); 31 else 32 value = intel_readw(mem, reg); 33 34 return scnprintf(buf + pos, RD_BUF - pos, "%4x\t%4x\n", reg, value); 35 } 36 37 static int intel_reg_show(struct seq_file *s_file, void *data) 38 { 39 struct sdw_intel *sdw = s_file->private; 40 void __iomem *s = sdw->link_res->shim; 41 void __iomem *vs_s = sdw->link_res->shim_vs; 42 ssize_t ret; 43 u32 pcm_cap; 44 int pcm_bd; 45 char *buf; 46 int j; 47 48 buf = kzalloc(RD_BUF, GFP_KERNEL); 49 if (!buf) 50 return -ENOMEM; 51 52 ret = scnprintf(buf, RD_BUF, "Register Value\n"); 53 ret += scnprintf(buf + ret, RD_BUF - ret, "\nShim\n"); 54 55 ret += intel_sprintf(s, true, buf, ret, SDW_SHIM2_LECAP); 56 ret += intel_sprintf(s, false, buf, ret, SDW_SHIM2_PCMSCAP); 57 58 pcm_cap = intel_readw(s, SDW_SHIM2_PCMSCAP); 59 pcm_bd = FIELD_GET(SDW_SHIM2_PCMSCAP_BSS, pcm_cap); 60 61 for (j = 0; j < pcm_bd; j++) { 62 ret += intel_sprintf(s, false, buf, ret, 63 SDW_SHIM2_PCMSYCHM(j)); 64 ret += intel_sprintf(s, false, buf, ret, 65 SDW_SHIM2_PCMSYCHC(j)); 66 } 67 68 ret += scnprintf(buf + ret, RD_BUF - ret, "\nVS CLK controls\n"); 69 ret += intel_sprintf(vs_s, true, buf, ret, SDW_SHIM2_INTEL_VS_LVSCTL); 70 71 ret += scnprintf(buf + ret, RD_BUF - ret, "\nVS Wake registers\n"); 72 ret += intel_sprintf(vs_s, false, buf, ret, SDW_SHIM2_INTEL_VS_WAKEEN); 73 ret += intel_sprintf(vs_s, false, buf, ret, SDW_SHIM2_INTEL_VS_WAKESTS); 74 75 ret += scnprintf(buf + ret, RD_BUF - ret, "\nVS IOCTL, ACTMCTL\n"); 76 ret += intel_sprintf(vs_s, false, buf, ret, SDW_SHIM2_INTEL_VS_IOCTL); 77 ret += intel_sprintf(vs_s, false, buf, ret, SDW_SHIM2_INTEL_VS_ACTMCTL); 78 79 seq_printf(s_file, "%s", buf); 80 kfree(buf); 81 82 return 0; 83 } 84 DEFINE_SHOW_ATTRIBUTE(intel_reg); 85 86 static int intel_set_m_datamode(void *data, u64 value) 87 { 88 struct sdw_intel *sdw = data; 89 struct sdw_bus *bus = &sdw->cdns.bus; 90 91 if (value > SDW_PORT_DATA_MODE_STATIC_1) 92 return -EINVAL; 93 94 /* Userspace changed the hardware state behind the kernel's back */ 95 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 96 97 bus->params.m_data_mode = value; 98 99 return 0; 100 } 101 DEFINE_DEBUGFS_ATTRIBUTE(intel_set_m_datamode_fops, NULL, 102 intel_set_m_datamode, "%llu\n"); 103 104 static int intel_set_s_datamode(void *data, u64 value) 105 { 106 struct sdw_intel *sdw = data; 107 struct sdw_bus *bus = &sdw->cdns.bus; 108 109 if (value > SDW_PORT_DATA_MODE_STATIC_1) 110 return -EINVAL; 111 112 /* Userspace changed the hardware state behind the kernel's back */ 113 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 114 115 bus->params.s_data_mode = value; 116 117 return 0; 118 } 119 DEFINE_DEBUGFS_ATTRIBUTE(intel_set_s_datamode_fops, NULL, 120 intel_set_s_datamode, "%llu\n"); 121 122 void intel_ace2x_debugfs_init(struct sdw_intel *sdw) 123 { 124 struct dentry *root = sdw->cdns.bus.debugfs; 125 126 if (!root) 127 return; 128 129 sdw->debugfs = debugfs_create_dir("intel-sdw", root); 130 131 debugfs_create_file("intel-registers", 0400, sdw->debugfs, sdw, 132 &intel_reg_fops); 133 134 debugfs_create_file("intel-m-datamode", 0200, sdw->debugfs, sdw, 135 &intel_set_m_datamode_fops); 136 137 debugfs_create_file("intel-s-datamode", 0200, sdw->debugfs, sdw, 138 &intel_set_s_datamode_fops); 139 140 sdw_cdns_debugfs_init(&sdw->cdns, sdw->debugfs); 141 } 142 143 void intel_ace2x_debugfs_exit(struct sdw_intel *sdw) 144 { 145 debugfs_remove_recursive(sdw->debugfs); 146 } 147 #endif /* CONFIG_DEBUG_FS */ 148