1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) 2 // Copyright(c) 2015-17 Intel Corporation. 3 4 /* 5 * MIPI Discovery And Configuration (DisCo) Specification for SoundWire 6 * specifies properties to be implemented for SoundWire Masters and Slaves. 7 * The DisCo spec doesn't mandate these properties. However, SDW bus cannot 8 * work without knowing these values. 9 * 10 * The helper functions read the Master and Slave properties. Implementers 11 * of Master or Slave drivers can use any of the below three mechanisms: 12 * a) Use these APIs here as .read_prop() callback for Master and Slave 13 * b) Implement own methods and set those as .read_prop(), but invoke 14 * APIs in this file for generic read and override the values with 15 * platform specific data 16 * c) Implement ones own methods which do not use anything provided 17 * here 18 */ 19 20 #include <linux/device.h> 21 #include <linux/property.h> 22 #include <linux/mod_devicetable.h> 23 #include <linux/soundwire/sdw.h> 24 #include "bus.h" 25 26 /** 27 * sdw_master_read_prop() - Read Master properties 28 * @bus: SDW bus instance 29 */ 30 int sdw_master_read_prop(struct sdw_bus *bus) 31 { 32 struct sdw_master_prop *prop = &bus->prop; 33 struct fwnode_handle *link; 34 char name[32]; 35 int nval, i; 36 37 device_property_read_u32(bus->dev, 38 "mipi-sdw-sw-interface-revision", 39 &prop->revision); 40 41 /* Find master handle */ 42 snprintf(name, sizeof(name), 43 "mipi-sdw-link-%d-subproperties", bus->link_id); 44 45 link = device_get_named_child_node(bus->dev, name); 46 if (!link) { 47 dev_err(bus->dev, "Master node %s not found\n", name); 48 return -EIO; 49 } 50 51 if (fwnode_property_read_bool(link, 52 "mipi-sdw-clock-stop-mode0-supported")) 53 prop->clk_stop_modes |= BIT(SDW_CLK_STOP_MODE0); 54 55 if (fwnode_property_read_bool(link, 56 "mipi-sdw-clock-stop-mode1-supported")) 57 prop->clk_stop_modes |= BIT(SDW_CLK_STOP_MODE1); 58 59 fwnode_property_read_u32(link, 60 "mipi-sdw-max-clock-frequency", 61 &prop->max_clk_freq); 62 63 nval = fwnode_property_count_u32(link, "mipi-sdw-clock-frequencies-supported"); 64 if (nval > 0) { 65 prop->num_clk_freq = nval; 66 prop->clk_freq = devm_kcalloc(bus->dev, prop->num_clk_freq, 67 sizeof(*prop->clk_freq), 68 GFP_KERNEL); 69 if (!prop->clk_freq) 70 return -ENOMEM; 71 72 fwnode_property_read_u32_array(link, 73 "mipi-sdw-clock-frequencies-supported", 74 prop->clk_freq, prop->num_clk_freq); 75 } 76 77 /* 78 * Check the frequencies supported. If FW doesn't provide max 79 * freq, then populate here by checking values. 80 */ 81 if (!prop->max_clk_freq && prop->clk_freq) { 82 prop->max_clk_freq = prop->clk_freq[0]; 83 for (i = 1; i < prop->num_clk_freq; i++) { 84 if (prop->clk_freq[i] > prop->max_clk_freq) 85 prop->max_clk_freq = prop->clk_freq[i]; 86 } 87 } 88 89 nval = fwnode_property_count_u32(link, "mipi-sdw-supported-clock-gears"); 90 if (nval > 0) { 91 prop->num_clk_gears = nval; 92 prop->clk_gears = devm_kcalloc(bus->dev, prop->num_clk_gears, 93 sizeof(*prop->clk_gears), 94 GFP_KERNEL); 95 if (!prop->clk_gears) 96 return -ENOMEM; 97 98 fwnode_property_read_u32_array(link, 99 "mipi-sdw-supported-clock-gears", 100 prop->clk_gears, 101 prop->num_clk_gears); 102 } 103 104 fwnode_property_read_u32(link, "mipi-sdw-default-frame-rate", 105 &prop->default_frame_rate); 106 107 fwnode_property_read_u32(link, "mipi-sdw-default-frame-row-size", 108 &prop->default_row); 109 110 fwnode_property_read_u32(link, "mipi-sdw-default-frame-col-size", 111 &prop->default_col); 112 113 prop->dynamic_frame = fwnode_property_read_bool(link, 114 "mipi-sdw-dynamic-frame-shape"); 115 116 fwnode_property_read_u32(link, "mipi-sdw-command-error-threshold", 117 &prop->err_threshold); 118 119 return 0; 120 } 121 EXPORT_SYMBOL(sdw_master_read_prop); 122 123 static int sdw_slave_read_dp0(struct sdw_slave *slave, 124 struct fwnode_handle *port, 125 struct sdw_dp0_prop *dp0) 126 { 127 int nval; 128 129 fwnode_property_read_u32(port, "mipi-sdw-port-max-wordlength", 130 &dp0->max_word); 131 132 fwnode_property_read_u32(port, "mipi-sdw-port-min-wordlength", 133 &dp0->min_word); 134 135 nval = fwnode_property_count_u32(port, "mipi-sdw-port-wordlength-configs"); 136 if (nval > 0) { 137 138 dp0->num_words = nval; 139 dp0->words = devm_kcalloc(&slave->dev, 140 dp0->num_words, sizeof(*dp0->words), 141 GFP_KERNEL); 142 if (!dp0->words) 143 return -ENOMEM; 144 145 fwnode_property_read_u32_array(port, 146 "mipi-sdw-port-wordlength-configs", 147 dp0->words, dp0->num_words); 148 } 149 150 dp0->BRA_flow_controlled = fwnode_property_read_bool(port, 151 "mipi-sdw-bra-flow-controlled"); 152 153 dp0->simple_ch_prep_sm = fwnode_property_read_bool(port, 154 "mipi-sdw-simplified-channel-prepare-sm"); 155 156 dp0->imp_def_interrupts = fwnode_property_read_bool(port, 157 "mipi-sdw-imp-def-dp0-interrupts-supported"); 158 159 return 0; 160 } 161 162 static int sdw_slave_read_dpn(struct sdw_slave *slave, 163 struct sdw_dpn_prop *dpn, int count, int ports, 164 char *type) 165 { 166 struct fwnode_handle *node; 167 u32 bit, i = 0; 168 int nval; 169 unsigned long addr; 170 char name[40]; 171 172 addr = ports; 173 /* valid ports are 1 to 14 so apply mask */ 174 addr &= GENMASK(14, 1); 175 176 for_each_set_bit(bit, &addr, 32) { 177 snprintf(name, sizeof(name), 178 "mipi-sdw-dp-%d-%s-subproperties", bit, type); 179 180 dpn[i].num = bit; 181 182 node = device_get_named_child_node(&slave->dev, name); 183 if (!node) { 184 dev_err(&slave->dev, "%s dpN not found\n", name); 185 return -EIO; 186 } 187 188 fwnode_property_read_u32(node, "mipi-sdw-port-max-wordlength", 189 &dpn[i].max_word); 190 fwnode_property_read_u32(node, "mipi-sdw-port-min-wordlength", 191 &dpn[i].min_word); 192 193 nval = fwnode_property_count_u32(node, "mipi-sdw-port-wordlength-configs"); 194 if (nval > 0) { 195 dpn[i].num_words = nval; 196 dpn[i].words = devm_kcalloc(&slave->dev, 197 dpn[i].num_words, 198 sizeof(*dpn[i].words), 199 GFP_KERNEL); 200 if (!dpn[i].words) 201 return -ENOMEM; 202 203 fwnode_property_read_u32_array(node, 204 "mipi-sdw-port-wordlength-configs", 205 dpn[i].words, dpn[i].num_words); 206 } 207 208 fwnode_property_read_u32(node, "mipi-sdw-data-port-type", 209 &dpn[i].type); 210 211 fwnode_property_read_u32(node, 212 "mipi-sdw-max-grouping-supported", 213 &dpn[i].max_grouping); 214 215 dpn[i].simple_ch_prep_sm = fwnode_property_read_bool(node, 216 "mipi-sdw-simplified-channelprepare-sm"); 217 218 fwnode_property_read_u32(node, 219 "mipi-sdw-port-channelprepare-timeout", 220 &dpn[i].ch_prep_timeout); 221 222 fwnode_property_read_u32(node, 223 "mipi-sdw-imp-def-dpn-interrupts-supported", 224 &dpn[i].imp_def_interrupts); 225 226 fwnode_property_read_u32(node, "mipi-sdw-min-channel-number", 227 &dpn[i].min_ch); 228 229 fwnode_property_read_u32(node, "mipi-sdw-max-channel-number", 230 &dpn[i].max_ch); 231 232 nval = fwnode_property_count_u32(node, "mipi-sdw-channel-number-list"); 233 if (nval > 0) { 234 dpn[i].num_channels = nval; 235 dpn[i].channels = devm_kcalloc(&slave->dev, 236 dpn[i].num_channels, 237 sizeof(*dpn[i].channels), 238 GFP_KERNEL); 239 if (!dpn[i].channels) 240 return -ENOMEM; 241 242 fwnode_property_read_u32_array(node, 243 "mipi-sdw-channel-number-list", 244 dpn[i].channels, dpn[i].num_channels); 245 } 246 247 nval = fwnode_property_count_u32(node, "mipi-sdw-channel-combination-list"); 248 if (nval > 0) { 249 dpn[i].num_ch_combinations = nval; 250 dpn[i].ch_combinations = devm_kcalloc(&slave->dev, 251 dpn[i].num_ch_combinations, 252 sizeof(*dpn[i].ch_combinations), 253 GFP_KERNEL); 254 if (!dpn[i].ch_combinations) 255 return -ENOMEM; 256 257 fwnode_property_read_u32_array(node, 258 "mipi-sdw-channel-combination-list", 259 dpn[i].ch_combinations, 260 dpn[i].num_ch_combinations); 261 } 262 263 fwnode_property_read_u32(node, 264 "mipi-sdw-modes-supported", &dpn[i].modes); 265 266 fwnode_property_read_u32(node, "mipi-sdw-max-async-buffer", 267 &dpn[i].max_async_buffer); 268 269 dpn[i].block_pack_mode = fwnode_property_read_bool(node, 270 "mipi-sdw-block-packing-mode"); 271 272 fwnode_property_read_u32(node, "mipi-sdw-port-encoding-type", 273 &dpn[i].port_encoding); 274 275 /* TODO: Read audio mode */ 276 277 i++; 278 } 279 280 return 0; 281 } 282 283 /** 284 * sdw_slave_read_prop() - Read Slave properties 285 * @slave: SDW Slave 286 */ 287 int sdw_slave_read_prop(struct sdw_slave *slave) 288 { 289 struct sdw_slave_prop *prop = &slave->prop; 290 struct device *dev = &slave->dev; 291 struct fwnode_handle *port; 292 int nval; 293 294 device_property_read_u32(dev, "mipi-sdw-sw-interface-revision", 295 &prop->mipi_revision); 296 297 prop->wake_capable = device_property_read_bool(dev, 298 "mipi-sdw-wake-up-unavailable"); 299 prop->wake_capable = !prop->wake_capable; 300 301 prop->test_mode_capable = device_property_read_bool(dev, 302 "mipi-sdw-test-mode-supported"); 303 304 prop->clk_stop_mode1 = false; 305 if (device_property_read_bool(dev, 306 "mipi-sdw-clock-stop-mode1-supported")) 307 prop->clk_stop_mode1 = true; 308 309 prop->simple_clk_stop_capable = device_property_read_bool(dev, 310 "mipi-sdw-simplified-clockstopprepare-sm-supported"); 311 312 device_property_read_u32(dev, "mipi-sdw-clockstopprepare-timeout", 313 &prop->clk_stop_timeout); 314 315 device_property_read_u32(dev, "mipi-sdw-slave-channelprepare-timeout", 316 &prop->ch_prep_timeout); 317 318 device_property_read_u32(dev, 319 "mipi-sdw-clockstopprepare-hard-reset-behavior", 320 &prop->reset_behave); 321 322 prop->high_PHY_capable = device_property_read_bool(dev, 323 "mipi-sdw-highPHY-capable"); 324 325 prop->paging_support = device_property_read_bool(dev, 326 "mipi-sdw-paging-support"); 327 328 prop->bank_delay_support = device_property_read_bool(dev, 329 "mipi-sdw-bank-delay-support"); 330 331 device_property_read_u32(dev, 332 "mipi-sdw-port15-read-behavior", &prop->p15_behave); 333 334 device_property_read_u32(dev, "mipi-sdw-master-count", 335 &prop->master_count); 336 337 device_property_read_u32(dev, "mipi-sdw-source-port-list", 338 &prop->source_ports); 339 340 device_property_read_u32(dev, "mipi-sdw-sink-port-list", 341 &prop->sink_ports); 342 343 /* Read dp0 properties */ 344 port = device_get_named_child_node(dev, "mipi-sdw-dp-0-subproperties"); 345 if (!port) { 346 dev_dbg(dev, "DP0 node not found!!\n"); 347 } else { 348 prop->dp0_prop = devm_kzalloc(&slave->dev, 349 sizeof(*prop->dp0_prop), 350 GFP_KERNEL); 351 if (!prop->dp0_prop) 352 return -ENOMEM; 353 354 sdw_slave_read_dp0(slave, port, prop->dp0_prop); 355 } 356 357 /* 358 * Based on each DPn port, get source and sink dpn properties. 359 * Also, some ports can operate as both source or sink. 360 */ 361 362 /* Allocate memory for set bits in port lists */ 363 nval = hweight32(prop->source_ports); 364 prop->src_dpn_prop = devm_kcalloc(&slave->dev, nval, 365 sizeof(*prop->src_dpn_prop), 366 GFP_KERNEL); 367 if (!prop->src_dpn_prop) 368 return -ENOMEM; 369 370 /* Read dpn properties for source port(s) */ 371 sdw_slave_read_dpn(slave, prop->src_dpn_prop, nval, 372 prop->source_ports, "source"); 373 374 nval = hweight32(prop->sink_ports); 375 prop->sink_dpn_prop = devm_kcalloc(&slave->dev, nval, 376 sizeof(*prop->sink_dpn_prop), 377 GFP_KERNEL); 378 if (!prop->sink_dpn_prop) 379 return -ENOMEM; 380 381 /* Read dpn properties for sink port(s) */ 382 sdw_slave_read_dpn(slave, prop->sink_dpn_prop, nval, 383 prop->sink_ports, "sink"); 384 385 return 0; 386 } 387 EXPORT_SYMBOL(sdw_slave_read_prop); 388