drivers/soundwire/mipi_disco.c

   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", &prop->revision);
  39
  40         /* Find master handle */
  41         snprintf(name, sizeof(name),
  42                         "mipi-sdw-master-%d-subproperties", bus->link_id);
  43
  44         link = device_get_named_child_node(bus->dev, name);
  45         if (!link) {
  46                 dev_err(bus->dev, "Master node %s not found\n", name);
  47                 return -EIO;
  48         }
  49
  50         if (fwnode_property_read_bool(link,
  51                         "mipi-sdw-clock-stop-mode0-supported") == true)
  52                 prop->clk_stop_mode = SDW_CLK_STOP_MODE0;
  53
  54         if (fwnode_property_read_bool(link,
  55                         "mipi-sdw-clock-stop-mode1-supported") == true)
  56                 prop->clk_stop_mode |= SDW_CLK_STOP_MODE1;
  57
  58         fwnode_property_read_u32(link,
  59                         "mipi-sdw-max-clock-frequency", &prop->max_freq);
  60
  61         nval = fwnode_property_read_u32_array(link,
  62                         "mipi-sdw-clock-frequencies-supported", NULL, 0);
  63         if (nval > 0) {
  64
  65                 prop->num_freq = nval;
  66                 prop->freq = devm_kcalloc(bus->dev, prop->num_freq,
  67                                 sizeof(*prop->freq), GFP_KERNEL);
  68                 if (!prop->freq)
  69                         return -ENOMEM;
  70
  71                 fwnode_property_read_u32_array(link,
  72                                 "mipi-sdw-clock-frequencies-supported",
  73                                 prop->freq, prop->num_freq);
  74         }
  75
  76         /*
  77          * Check the frequencies supported. If FW doesn't provide max
  78          * freq, then populate here by checking values.
  79          */
  80         if (!prop->max_freq && prop->freq) {
  81                 prop->max_freq = prop->freq[0];
  82                 for (i = 1; i < prop->num_freq; i++) {
  83                         if (prop->freq[i] > prop->max_freq)
  84                                 prop->max_freq = prop->freq[i];
  85                 }
  86         }
  87
  88         nval = fwnode_property_read_u32_array(link,
  89                         "mipi-sdw-supported-clock-gears", NULL, 0);
  90         if (nval > 0) {
  91
  92                 prop->num_clk_gears = nval;
  93                 prop->clk_gears = devm_kcalloc(bus->dev, prop->num_clk_gears,
  94                                 sizeof(*prop->clk_gears), 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, prop->num_clk_gears);
 101         }
 102
 103         fwnode_property_read_u32(link, "mipi-sdw-default-frame-rate",
 104                         &prop->default_frame_rate);
 105
 106         fwnode_property_read_u32(link, "mipi-sdw-default-frame-row-size",
 107                         &prop->default_row);
 108
 109         fwnode_property_read_u32(link, "mipi-sdw-default-frame-col-size",
 110                         &prop->default_col);
 111
 112         prop->dynamic_frame =  fwnode_property_read_bool(link,
 113                         "mipi-sdw-dynamic-frame-shape");
 114
 115         fwnode_property_read_u32(link, "mipi-sdw-command-error-threshold",
 116                         &prop->err_threshold);
 117
 118         return 0;
 119 }
 120 EXPORT_SYMBOL(sdw_master_read_prop);
 121
 122 static int sdw_slave_read_dp0(struct sdw_slave *slave,
 123                 struct fwnode_handle *port, struct sdw_dp0_prop *dp0)
 124 {
 125         int nval;
 126
 127         fwnode_property_read_u32(port, "mipi-sdw-port-max-wordlength",
 128                         &dp0->max_word);
 129
 130         fwnode_property_read_u32(port, "mipi-sdw-port-min-wordlength",
 131                         &dp0->min_word);
 132
 133         nval = fwnode_property_read_u32_array(port,
 134                         "mipi-sdw-port-wordlength-configs", NULL, 0);
 135         if (nval > 0) {
 136
 137                 dp0->num_words = nval;
 138                 dp0->words = devm_kcalloc(&slave->dev,
 139                                 dp0->num_words, sizeof(*dp0->words),
 140                                 GFP_KERNEL);
 141                 if (!dp0->words)
 142                         return -ENOMEM;
 143
 144                 fwnode_property_read_u32_array(port,
 145                                 "mipi-sdw-port-wordlength-configs",
 146                                 dp0->words, dp0->num_words);
 147         }
 148
 149         dp0->flow_controlled = fwnode_property_read_bool(
 150                         port, "mipi-sdw-bra-flow-controlled");
 151
 152         dp0->simple_ch_prep_sm = fwnode_property_read_bool(
 153                         port, "mipi-sdw-simplified-channel-prepare-sm");
 154
 155         dp0->device_interrupts = fwnode_property_read_bool(
 156                         port, "mipi-sdw-imp-def-dp0-interrupts-supported");
 157
 158         return 0;
 159 }
 160
 161 static int sdw_slave_read_dpn(struct sdw_slave *slave,
 162                 struct sdw_dpn_prop *dpn, int count, int ports, char *type)
 163 {
 164         struct fwnode_handle *node;
 165         u32 bit, i = 0;
 166         int nval;
 167         unsigned long addr;
 168         char name[40];
 169
 170         addr = ports;
 171         /* valid ports are 1 to 14 so apply mask */
 172         addr &= GENMASK(14, 1);
 173
 174         for_each_set_bit(bit, &addr, 32) {
 175                 snprintf(name, sizeof(name),
 176                         "mipi-sdw-dp-%d-%s-subproperties", bit, type);
 177
 178                 dpn[i].num = bit;
 179
 180                 node = device_get_named_child_node(&slave->dev, name);
 181                 if (!node) {
 182                         dev_err(&slave->dev, "%s dpN not found\n", name);
 183                         return -EIO;
 184                 }
 185
 186                 fwnode_property_read_u32(node, "mipi-sdw-port-max-wordlength",
 187                                         &dpn[i].max_word);
 188                 fwnode_property_read_u32(node, "mipi-sdw-port-min-wordlength",
 189                                         &dpn[i].min_word);
 190
 191                 nval = fwnode_property_read_u32_array(node,
 192                                 "mipi-sdw-port-wordlength-configs", NULL, 0);
 193                 if (nval > 0) {
 194
 195                         dpn[i].num_words = nval;
 196                         dpn[i].words = devm_kcalloc(&slave->dev,
 197                                         dpn[i].num_words,
 198                                         sizeof(*dpn[i].words), GFP_KERNEL);
 199                         if (!dpn[i].words)
 200                                 return -ENOMEM;
 201
 202                         fwnode_property_read_u32_array(node,
 203                                         "mipi-sdw-port-wordlength-configs",
 204                                         dpn[i].words, dpn[i].num_words);
 205                 }
 206
 207                 fwnode_property_read_u32(node, "mipi-sdw-data-port-type",
 208                                 &dpn[i].type);
 209
 210                 fwnode_property_read_u32(node,
 211                                 "mipi-sdw-max-grouping-supported",
 212                                 &dpn[i].max_grouping);
 213
 214                 dpn[i].simple_ch_prep_sm = fwnode_property_read_bool(node,
 215                                 "mipi-sdw-simplified-channelprepare-sm");
 216
 217                 fwnode_property_read_u32(node,
 218                                 "mipi-sdw-port-channelprepare-timeout",
 219                                 &dpn[i].ch_prep_timeout);
 220
 221                 fwnode_property_read_u32(node,
 222                                 "mipi-sdw-imp-def-dpn-interrupts-supported",
 223                                 &dpn[i].device_interrupts);
 224
 225                 fwnode_property_read_u32(node, "mipi-sdw-min-channel-number",
 226                                 &dpn[i].min_ch);
 227
 228                 fwnode_property_read_u32(node, "mipi-sdw-max-channel-number",
 229                                 &dpn[i].max_ch);
 230
 231                 nval = fwnode_property_read_u32_array(node,
 232                                 "mipi-sdw-channel-number-list", NULL, 0);
 233                 if (nval > 0) {
 234
 235                         dpn[i].num_ch = nval;
 236                         dpn[i].ch = devm_kcalloc(&slave->dev, dpn[i].num_ch,
 237                                         sizeof(*dpn[i].ch), GFP_KERNEL);
 238                         if (!dpn[i].ch)
 239                                 return -ENOMEM;
 240
 241                         fwnode_property_read_u32_array(node,
 242                                         "mipi-sdw-channel-number-list",
 243                                         dpn[i].ch, dpn[i].num_ch);
 244                 }
 245
 246                 nval = fwnode_property_read_u32_array(node,
 247                                 "mipi-sdw-channel-combination-list", NULL, 0);
 248                 if (nval > 0) {
 249
 250                         dpn[i].num_ch_combinations = nval;
 251                         dpn[i].ch_combinations = devm_kcalloc(&slave->dev,
 252                                         dpn[i].num_ch_combinations,
 253                                         sizeof(*dpn[i].ch_combinations),
 254                                         GFP_KERNEL);
 255                         if (!dpn[i].ch_combinations)
 256                                 return -ENOMEM;
 257
 258                         fwnode_property_read_u32_array(node,
 259                                         "mipi-sdw-channel-combination-list",
 260                                         dpn[i].ch_combinations,
 261                                         dpn[i].num_ch_combinations);
 262                 }
 263
 264                 fwnode_property_read_u32(node,
 265                                 "mipi-sdw-modes-supported", &dpn[i].modes);
 266
 267                 fwnode_property_read_u32(node, "mipi-sdw-max-async-buffer",
 268                                 &dpn[i].max_async_buffer);
 269
 270                 dpn[i].block_pack_mode = fwnode_property_read_bool(node,
 271                                 "mipi-sdw-block-packing-mode");
 272
 273                 fwnode_property_read_u32(node, "mipi-sdw-port-encoding-type",
 274                                 &dpn[i].port_encoding);
 275
 276                 /* TODO: Read audio mode */
 277
 278                 i++;
 279         }
 280
 281         return 0;
 282 }
 283
 284 /**
 285  * sdw_slave_read_prop() - Read Slave properties
 286  * @slave: SDW Slave
 287  */
 288 int sdw_slave_read_prop(struct sdw_slave *slave)
 289 {
 290         struct sdw_slave_prop *prop = &slave->prop;
 291         struct device *dev = &slave->dev;
 292         struct fwnode_handle *port;
 293         int num_of_ports, nval, i, dp0 = 0;
 294
 295         device_property_read_u32(dev, "mipi-sdw-sw-interface-revision",
 296                                 &prop->mipi_revision);
 297
 298         prop->wake_capable = device_property_read_bool(dev,
 299                                 "mipi-sdw-wake-up-unavailable");
 300         prop->wake_capable = !prop->wake_capable;
 301
 302         prop->test_mode_capable = device_property_read_bool(dev,
 303                                 "mipi-sdw-test-mode-supported");
 304
 305         prop->clk_stop_mode1 = false;
 306         if (device_property_read_bool(dev,
 307                                 "mipi-sdw-clock-stop-mode1-supported"))
 308                 prop->clk_stop_mode1 = true;
 309
 310         prop->simple_clk_stop_capable = device_property_read_bool(dev,
 311                         "mipi-sdw-simplified-clockstopprepare-sm-supported");
 312
 313         device_property_read_u32(dev, "mipi-sdw-clockstopprepare-timeout",
 314                         &prop->clk_stop_timeout);
 315
 316         device_property_read_u32(dev, "mipi-sdw-slave-channelprepare-timeout",
 317                         &prop->ch_prep_timeout);
 318
 319         device_property_read_u32(dev,
 320                         "mipi-sdw-clockstopprepare-hard-reset-behavior",
 321                         &prop->reset_behave);
 322
 323         prop->high_PHY_capable = device_property_read_bool(dev,
 324                         "mipi-sdw-highPHY-capable");
 325
 326         prop->paging_support = device_property_read_bool(dev,
 327                         "mipi-sdw-paging-support");
 328
 329         prop->bank_delay_support = device_property_read_bool(dev,
 330                         "mipi-sdw-bank-delay-support");
 331
 332         device_property_read_u32(dev,
 333                         "mipi-sdw-port15-read-behavior", &prop->p15_behave);
 334
 335         device_property_read_u32(dev, "mipi-sdw-master-count",
 336                                 &prop->master_count);
 337
 338         device_property_read_u32(dev, "mipi-sdw-source-port-list",
 339                                 &prop->source_ports);
 340
 341         device_property_read_u32(dev, "mipi-sdw-sink-port-list",
 342                                 &prop->sink_ports);
 343
 344         /* Read dp0 properties */
 345         port = device_get_named_child_node(dev, "mipi-sdw-dp-0-subproperties");
 346         if (!port) {
 347                 dev_dbg(dev, "DP0 node not found!!\n");
 348         } else {
 349
 350                 prop->dp0_prop = devm_kzalloc(&slave->dev,
 351                                 sizeof(*prop->dp0_prop), GFP_KERNEL);
 352                 if (!prop->dp0_prop)
 353                         return -ENOMEM;
 354
 355                 sdw_slave_read_dp0(slave, port, prop->dp0_prop);
 356                 dp0 = 1;
 357         }
 358
 359         /*
 360          * Based on each DPn port, get source and sink dpn properties.
 361          * Also, some ports can operate as both source or sink.
 362          */
 363
 364         /* Allocate memory for set bits in port lists */
 365         nval = hweight32(prop->source_ports);
 366         prop->src_dpn_prop = devm_kcalloc(&slave->dev, nval,
 367                                 sizeof(*prop->src_dpn_prop), GFP_KERNEL);
 368         if (!prop->src_dpn_prop)
 369                 return -ENOMEM;
 370
 371         /* Read dpn properties for source port(s) */
 372         sdw_slave_read_dpn(slave, prop->src_dpn_prop, nval,
 373                         prop->source_ports, "source");
 374
 375         nval = hweight32(prop->sink_ports);
 376         prop->sink_dpn_prop = devm_kcalloc(&slave->dev, nval,
 377                                 sizeof(*prop->sink_dpn_prop), 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         /* some ports are bidirectional so check total ports by ORing */
 386         nval = prop->source_ports | prop->sink_ports;
 387         num_of_ports = hweight32(nval) + dp0; /* add DP0 */
 388
 389         /* Allocate port_ready based on num_of_ports */
 390         slave->port_ready = devm_kcalloc(&slave->dev, num_of_ports,
 391                                 sizeof(*slave->port_ready), GFP_KERNEL);
 392         if (!slave->port_ready)
 393                 return -ENOMEM;
 394
 395         /* Initialize completion */
 396         for (i = 0; i < num_of_ports; i++)
 397                 init_completion(&slave->port_ready[i]);
 398
 399         return 0;
 400 }
 401 EXPORT_SYMBOL(sdw_slave_read_prop);