1 // SPDX-License-Identifier: GPL-2.0-only 2 // Copyright(c) 2017-2019 Intel Corporation. 3 4 #include <linux/device.h> 5 #include <linux/debugfs.h> 6 #include <linux/mod_devicetable.h> 7 #include <linux/pm_runtime.h> 8 #include <linux/slab.h> 9 #include <linux/soundwire/sdw.h> 10 #include <linux/soundwire/sdw_registers.h> 11 #include "bus.h" 12 13 static struct dentry *sdw_debugfs_root; 14 15 void sdw_bus_debugfs_init(struct sdw_bus *bus) 16 { 17 char name[16]; 18 19 if (!sdw_debugfs_root) 20 return; 21 22 /* create the debugfs master-N */ 23 snprintf(name, sizeof(name), "master-%d-%d", bus->id, bus->link_id); 24 bus->debugfs = debugfs_create_dir(name, sdw_debugfs_root); 25 } 26 27 void sdw_bus_debugfs_exit(struct sdw_bus *bus) 28 { 29 debugfs_remove_recursive(bus->debugfs); 30 } 31 32 #define RD_BUF (3 * PAGE_SIZE) 33 34 static ssize_t sdw_sprintf(struct sdw_slave *slave, 35 char *buf, size_t pos, unsigned int reg) 36 { 37 int value; 38 39 value = sdw_read_no_pm(slave, reg); 40 41 if (value < 0) 42 return scnprintf(buf + pos, RD_BUF - pos, "%3x\tXX\n", reg); 43 else 44 return scnprintf(buf + pos, RD_BUF - pos, 45 "%3x\t%2x\n", reg, value); 46 } 47 48 static int sdw_slave_reg_show(struct seq_file *s_file, void *data) 49 { 50 struct sdw_slave *slave = s_file->private; 51 char *buf; 52 ssize_t ret; 53 int i, j; 54 55 buf = kzalloc(RD_BUF, GFP_KERNEL); 56 if (!buf) 57 return -ENOMEM; 58 59 ret = pm_runtime_get_sync(&slave->dev); 60 if (ret < 0 && ret != -EACCES) { 61 pm_runtime_put_noidle(&slave->dev); 62 kfree(buf); 63 return ret; 64 } 65 66 ret = scnprintf(buf, RD_BUF, "Register Value\n"); 67 68 /* DP0 non-banked registers */ 69 ret += scnprintf(buf + ret, RD_BUF - ret, "\nDP0\n"); 70 for (i = SDW_DP0_INT; i <= SDW_DP0_PREPARECTRL; i++) 71 ret += sdw_sprintf(slave, buf, ret, i); 72 73 /* DP0 Bank 0 registers */ 74 ret += scnprintf(buf + ret, RD_BUF - ret, "Bank0\n"); 75 ret += sdw_sprintf(slave, buf, ret, SDW_DP0_CHANNELEN); 76 for (i = SDW_DP0_SAMPLECTRL1; i <= SDW_DP0_LANECTRL; i++) 77 ret += sdw_sprintf(slave, buf, ret, i); 78 79 /* DP0 Bank 1 registers */ 80 ret += scnprintf(buf + ret, RD_BUF - ret, "Bank1\n"); 81 ret += sdw_sprintf(slave, buf, ret, 82 SDW_DP0_CHANNELEN + SDW_BANK1_OFFSET); 83 for (i = SDW_DP0_SAMPLECTRL1 + SDW_BANK1_OFFSET; 84 i <= SDW_DP0_LANECTRL + SDW_BANK1_OFFSET; i++) 85 ret += sdw_sprintf(slave, buf, ret, i); 86 87 /* SCP registers */ 88 ret += scnprintf(buf + ret, RD_BUF - ret, "\nSCP\n"); 89 for (i = SDW_SCP_INT1; i <= SDW_SCP_BUS_CLOCK_BASE; i++) 90 ret += sdw_sprintf(slave, buf, ret, i); 91 for (i = SDW_SCP_DEVID_0; i <= SDW_SCP_DEVID_5; i++) 92 ret += sdw_sprintf(slave, buf, ret, i); 93 for (i = SDW_SCP_FRAMECTRL_B0; i <= SDW_SCP_BUSCLOCK_SCALE_B0; i++) 94 ret += sdw_sprintf(slave, buf, ret, i); 95 for (i = SDW_SCP_FRAMECTRL_B1; i <= SDW_SCP_BUSCLOCK_SCALE_B1; i++) 96 ret += sdw_sprintf(slave, buf, ret, i); 97 for (i = SDW_SCP_PHY_OUT_CTRL_0; i <= SDW_SCP_PHY_OUT_CTRL_7; i++) 98 ret += sdw_sprintf(slave, buf, ret, i); 99 100 101 /* 102 * SCP Bank 0/1 registers are read-only and cannot be 103 * retrieved from the Slave. The Master typically keeps track 104 * of the current frame size so the information can be found 105 * in other places 106 */ 107 108 /* DP1..14 registers */ 109 for (i = 1; SDW_VALID_PORT_RANGE(i); i++) { 110 111 /* DPi registers */ 112 ret += scnprintf(buf + ret, RD_BUF - ret, "\nDP%d\n", i); 113 for (j = SDW_DPN_INT(i); j <= SDW_DPN_PREPARECTRL(i); j++) 114 ret += sdw_sprintf(slave, buf, ret, j); 115 116 /* DPi Bank0 registers */ 117 ret += scnprintf(buf + ret, RD_BUF - ret, "Bank0\n"); 118 for (j = SDW_DPN_CHANNELEN_B0(i); 119 j <= SDW_DPN_LANECTRL_B0(i); j++) 120 ret += sdw_sprintf(slave, buf, ret, j); 121 122 /* DPi Bank1 registers */ 123 ret += scnprintf(buf + ret, RD_BUF - ret, "Bank1\n"); 124 for (j = SDW_DPN_CHANNELEN_B1(i); 125 j <= SDW_DPN_LANECTRL_B1(i); j++) 126 ret += sdw_sprintf(slave, buf, ret, j); 127 } 128 129 seq_printf(s_file, "%s", buf); 130 131 pm_runtime_mark_last_busy(&slave->dev); 132 pm_runtime_put(&slave->dev); 133 134 kfree(buf); 135 136 return 0; 137 } 138 DEFINE_SHOW_ATTRIBUTE(sdw_slave_reg); 139 140 void sdw_slave_debugfs_init(struct sdw_slave *slave) 141 { 142 struct dentry *master; 143 struct dentry *d; 144 char name[32]; 145 146 master = slave->bus->debugfs; 147 148 /* create the debugfs slave-name */ 149 snprintf(name, sizeof(name), "%s", dev_name(&slave->dev)); 150 d = debugfs_create_dir(name, master); 151 152 debugfs_create_file("registers", 0400, d, slave, &sdw_slave_reg_fops); 153 154 slave->debugfs = d; 155 } 156 157 void sdw_slave_debugfs_exit(struct sdw_slave *slave) 158 { 159 debugfs_remove_recursive(slave->debugfs); 160 } 161 162 void sdw_debugfs_init(void) 163 { 164 sdw_debugfs_root = debugfs_create_dir("soundwire", NULL); 165 } 166 167 void sdw_debugfs_exit(void) 168 { 169 debugfs_remove_recursive(sdw_debugfs_root); 170 } 171