drivers/soundwire/qcom.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (c) 2019, Linaro Limited
   3
   4 #include <linux/clk.h>
   5 #include <linux/completion.h>
   6 #include <linux/interrupt.h>
   7 #include <linux/io.h>
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <linux/of.h>
  11 #include <linux/of_irq.h>
  12 #include <linux/of_device.h>
  13 #include <linux/regmap.h>
  14 #include <linux/slab.h>
  15 #include <linux/slimbus.h>
  16 #include <linux/soundwire/sdw.h>
  17 #include <linux/soundwire/sdw_registers.h>
  18 #include <sound/pcm_params.h>
  19 #include <sound/soc.h>
  20 #include "bus.h"
  21
  22 #define SWRM_COMP_HW_VERSION                                    0x00
  23 #define SWRM_COMP_CFG_ADDR                                      0x04
  24 #define SWRM_COMP_CFG_IRQ_LEVEL_OR_PULSE_MSK                    BIT(1)
  25 #define SWRM_COMP_CFG_ENABLE_MSK                                BIT(0)
  26 #define SWRM_COMP_PARAMS                                        0x100
  27 #define SWRM_COMP_PARAMS_DOUT_PORTS_MASK                        GENMASK(4, 0)
  28 #define SWRM_COMP_PARAMS_DIN_PORTS_MASK                         GENMASK(9, 5)
  29 #define SWRM_INTERRUPT_STATUS                                   0x200
  30 #define SWRM_INTERRUPT_STATUS_RMSK                              GENMASK(16, 0)
  31 #define SWRM_INTERRUPT_STATUS_NEW_SLAVE_ATTACHED                BIT(1)
  32 #define SWRM_INTERRUPT_STATUS_CHANGE_ENUM_SLAVE_STATUS          BIT(2)
  33 #define SWRM_INTERRUPT_STATUS_CMD_ERROR                         BIT(7)
  34 #define SWRM_INTERRUPT_STATUS_SPECIAL_CMD_ID_FINISHED           BIT(10)
  35 #define SWRM_INTERRUPT_MASK_ADDR                                0x204
  36 #define SWRM_INTERRUPT_CLEAR                                    0x208
  37 #define SWRM_CMD_FIFO_WR_CMD                                    0x300
  38 #define SWRM_CMD_FIFO_RD_CMD                                    0x304
  39 #define SWRM_CMD_FIFO_CMD                                       0x308
  40 #define SWRM_CMD_FIFO_STATUS                                    0x30C
  41 #define SWRM_CMD_FIFO_CFG_ADDR                                  0x314
  42 #define SWRM_RD_WR_CMD_RETRIES                                  0x7
  43 #define SWRM_CMD_FIFO_RD_FIFO_ADDR                              0x318
  44 #define SWRM_ENUMERATOR_CFG_ADDR                                0x500
  45 #define SWRM_MCP_FRAME_CTRL_BANK_ADDR(m)                (0x101C + 0x40 * (m))
  46 #define SWRM_MCP_FRAME_CTRL_BANK_ROW_CTRL_SHFT                  3
  47 #define SWRM_MCP_FRAME_CTRL_BANK_COL_CTRL_BMSK                  GENMASK(2, 0)
  48 #define SWRM_MCP_FRAME_CTRL_BANK_ROW_CTRL_BMSK                  GENMASK(7, 3)
  49 #define SWRM_MCP_FRAME_CTRL_BANK_COL_CTRL_SHFT                  0
  50 #define SWRM_MCP_CFG_ADDR                                       0x1048
  51 #define SWRM_MCP_CFG_MAX_NUM_OF_CMD_NO_PINGS_BMSK               GENMASK(21, 17)
  52 #define SWRM_MCP_CFG_MAX_NUM_OF_CMD_NO_PINGS_SHFT               0x11
  53 #define SWRM_DEF_CMD_NO_PINGS                                   0x1f
  54 #define SWRM_MCP_STATUS                                         0x104C
  55 #define SWRM_MCP_STATUS_BANK_NUM_MASK                           BIT(0)
  56 #define SWRM_MCP_SLV_STATUS                                     0x1090
  57 #define SWRM_MCP_SLV_STATUS_MASK                                GENMASK(1, 0)
  58 #define SWRM_DP_PORT_CTRL_BANK(n, m)    (0x1124 + 0x100 * (n - 1) + 0x40 * m)
  59 #define SWRM_DP_PORT_CTRL_EN_CHAN_SHFT                          0x18
  60 #define SWRM_DP_PORT_CTRL_OFFSET2_SHFT                          0x10
  61 #define SWRM_DP_PORT_CTRL_OFFSET1_SHFT                          0x08
  62 #define SWRM_AHB_BRIDGE_WR_DATA_0                               0xc85
  63 #define SWRM_AHB_BRIDGE_WR_ADDR_0                               0xc89
  64 #define SWRM_AHB_BRIDGE_RD_ADDR_0                               0xc8d
  65 #define SWRM_AHB_BRIDGE_RD_DATA_0                               0xc91
  66
  67 #define SWRM_REG_VAL_PACK(data, dev, id, reg)   \
  68                         ((reg) | ((id) << 16) | ((dev) << 20) | ((data) << 24))
  69
  70 #define SWRM_MAX_ROW_VAL        0 /* Rows = 48 */
  71 #define SWRM_DEFAULT_ROWS       48
  72 #define SWRM_MIN_COL_VAL        0 /* Cols = 2 */
  73 #define SWRM_DEFAULT_COL        16
  74 #define SWRM_MAX_COL_VAL        7
  75 #define SWRM_SPECIAL_CMD_ID     0xF
  76 #define MAX_FREQ_NUM            1
  77 #define TIMEOUT_MS              (2 * HZ)
  78 #define QCOM_SWRM_MAX_RD_LEN    0xf
  79 #define QCOM_SDW_MAX_PORTS      14
  80 #define DEFAULT_CLK_FREQ        9600000
  81 #define SWRM_MAX_DAIS           0xF
  82
  83 struct qcom_swrm_port_config {
  84         u8 si;
  85         u8 off1;
  86         u8 off2;
  87 };
  88
  89 struct qcom_swrm_ctrl {
  90         struct sdw_bus bus;
  91         struct device *dev;
  92         struct regmap *regmap;
  93         struct completion *comp;
  94         struct work_struct slave_work;
  95         /* read/write lock */
  96         spinlock_t comp_lock;
  97         /* Port alloc/free lock */
  98         struct mutex port_lock;
  99         struct clk *hclk;
 100         u8 wr_cmd_id;
 101         u8 rd_cmd_id;
 102         int irq;
 103         unsigned int version;
 104         int num_din_ports;
 105         int num_dout_ports;
 106         unsigned long dout_port_mask;
 107         unsigned long din_port_mask;
 108         struct qcom_swrm_port_config pconfig[QCOM_SDW_MAX_PORTS];
 109         struct sdw_stream_runtime *sruntime[SWRM_MAX_DAIS];
 110         enum sdw_slave_status status[SDW_MAX_DEVICES];
 111         int (*reg_read)(struct qcom_swrm_ctrl *ctrl, int reg, u32 *val);
 112         int (*reg_write)(struct qcom_swrm_ctrl *ctrl, int reg, int val);
 113 };
 114
 115 #define to_qcom_sdw(b)  container_of(b, struct qcom_swrm_ctrl, bus)
 116
 117 static int qcom_swrm_abh_reg_read(struct qcom_swrm_ctrl *ctrl, int reg,
 118                                   u32 *val)
 119 {
 120         struct regmap *wcd_regmap = ctrl->regmap;
 121         int ret;
 122
 123         /* pg register + offset */
 124         ret = regmap_bulk_write(wcd_regmap, SWRM_AHB_BRIDGE_RD_ADDR_0,
 125                           (u8 *)&reg, 4);
 126         if (ret < 0)
 127                 return SDW_CMD_FAIL;
 128
 129         ret = regmap_bulk_read(wcd_regmap, SWRM_AHB_BRIDGE_RD_DATA_0,
 130                                val, 4);
 131         if (ret < 0)
 132                 return SDW_CMD_FAIL;
 133
 134         return SDW_CMD_OK;
 135 }
 136
 137 static int qcom_swrm_ahb_reg_write(struct qcom_swrm_ctrl *ctrl,
 138                                    int reg, int val)
 139 {
 140         struct regmap *wcd_regmap = ctrl->regmap;
 141         int ret;
 142         /* pg register + offset */
 143         ret = regmap_bulk_write(wcd_regmap, SWRM_AHB_BRIDGE_WR_DATA_0,
 144                           (u8 *)&val, 4);
 145         if (ret)
 146                 return SDW_CMD_FAIL;
 147
 148         /* write address register */
 149         ret = regmap_bulk_write(wcd_regmap, SWRM_AHB_BRIDGE_WR_ADDR_0,
 150                           (u8 *)&reg, 4);
 151         if (ret)
 152                 return SDW_CMD_FAIL;
 153
 154         return SDW_CMD_OK;
 155 }
 156
 157 static int qcom_swrm_cmd_fifo_wr_cmd(struct qcom_swrm_ctrl *ctrl, u8 cmd_data,
 158                                      u8 dev_addr, u16 reg_addr)
 159 {
 160         DECLARE_COMPLETION_ONSTACK(comp);
 161         unsigned long flags;
 162         u32 val;
 163         int ret;
 164
 165         spin_lock_irqsave(&ctrl->comp_lock, flags);
 166         ctrl->comp = &comp;
 167         spin_unlock_irqrestore(&ctrl->comp_lock, flags);
 168         val = SWRM_REG_VAL_PACK(cmd_data, dev_addr,
 169                                 SWRM_SPECIAL_CMD_ID, reg_addr);
 170         ret = ctrl->reg_write(ctrl, SWRM_CMD_FIFO_WR_CMD, val);
 171         if (ret)
 172                 goto err;
 173
 174         ret = wait_for_completion_timeout(ctrl->comp,
 175                                           msecs_to_jiffies(TIMEOUT_MS));
 176
 177         if (!ret)
 178                 ret = SDW_CMD_IGNORED;
 179         else
 180                 ret = SDW_CMD_OK;
 181 err:
 182         spin_lock_irqsave(&ctrl->comp_lock, flags);
 183         ctrl->comp = NULL;
 184         spin_unlock_irqrestore(&ctrl->comp_lock, flags);
 185
 186         return ret;
 187 }
 188
 189 static int qcom_swrm_cmd_fifo_rd_cmd(struct qcom_swrm_ctrl *ctrl,
 190                                      u8 dev_addr, u16 reg_addr,
 191                                      u32 len, u8 *rval)
 192 {
 193         int i, ret;
 194         u32 val;
 195         DECLARE_COMPLETION_ONSTACK(comp);
 196         unsigned long flags;
 197
 198         spin_lock_irqsave(&ctrl->comp_lock, flags);
 199         ctrl->comp = &comp;
 200         spin_unlock_irqrestore(&ctrl->comp_lock, flags);
 201
 202         val = SWRM_REG_VAL_PACK(len, dev_addr, SWRM_SPECIAL_CMD_ID, reg_addr);
 203         ret = ctrl->reg_write(ctrl, SWRM_CMD_FIFO_RD_CMD, val);
 204         if (ret)
 205                 goto err;
 206
 207         ret = wait_for_completion_timeout(ctrl->comp,
 208                                           msecs_to_jiffies(TIMEOUT_MS));
 209
 210         if (!ret) {
 211                 ret = SDW_CMD_IGNORED;
 212                 goto err;
 213         } else {
 214                 ret = SDW_CMD_OK;
 215         }
 216
 217         for (i = 0; i < len; i++) {
 218                 ctrl->reg_read(ctrl, SWRM_CMD_FIFO_RD_FIFO_ADDR, &val);
 219                 rval[i] = val & 0xFF;
 220         }
 221
 222 err:
 223         spin_lock_irqsave(&ctrl->comp_lock, flags);
 224         ctrl->comp = NULL;
 225         spin_unlock_irqrestore(&ctrl->comp_lock, flags);
 226
 227         return ret;
 228 }
 229
 230 static void qcom_swrm_get_device_status(struct qcom_swrm_ctrl *ctrl)
 231 {
 232         u32 val;
 233         int i;
 234
 235         ctrl->reg_read(ctrl, SWRM_MCP_SLV_STATUS, &val);
 236
 237         for (i = 0; i < SDW_MAX_DEVICES; i++) {
 238                 u32 s;
 239
 240                 s = (val >> (i * 2));
 241                 s &= SWRM_MCP_SLV_STATUS_MASK;
 242                 ctrl->status[i] = s;
 243         }
 244 }
 245
 246 static irqreturn_t qcom_swrm_irq_handler(int irq, void *dev_id)
 247 {
 248         struct qcom_swrm_ctrl *ctrl = dev_id;
 249         u32 sts, value;
 250         unsigned long flags;
 251
 252         ctrl->reg_read(ctrl, SWRM_INTERRUPT_STATUS, &sts);
 253
 254         if (sts & SWRM_INTERRUPT_STATUS_CMD_ERROR) {
 255                 ctrl->reg_read(ctrl, SWRM_CMD_FIFO_STATUS, &value);
 256                 dev_err_ratelimited(ctrl->dev,
 257                                     "CMD error, fifo status 0x%x\n",
 258                                      value);
 259                 ctrl->reg_write(ctrl, SWRM_CMD_FIFO_CMD, 0x1);
 260         }
 261
 262         if ((sts & SWRM_INTERRUPT_STATUS_NEW_SLAVE_ATTACHED) ||
 263             sts & SWRM_INTERRUPT_STATUS_CHANGE_ENUM_SLAVE_STATUS)
 264                 schedule_work(&ctrl->slave_work);
 265
 266         /**
 267          * clear the interrupt before complete() is called, as complete can
 268          * schedule new read/writes which require interrupts, clearing the
 269          * interrupt would avoid missing interrupts in such cases.
 270          */
 271         ctrl->reg_write(ctrl, SWRM_INTERRUPT_CLEAR, sts);
 272
 273         if (sts & SWRM_INTERRUPT_STATUS_SPECIAL_CMD_ID_FINISHED) {
 274                 spin_lock_irqsave(&ctrl->comp_lock, flags);
 275                 if (ctrl->comp)
 276                         complete(ctrl->comp);
 277                 spin_unlock_irqrestore(&ctrl->comp_lock, flags);
 278         }
 279
 280         return IRQ_HANDLED;
 281 }
 282 static int qcom_swrm_init(struct qcom_swrm_ctrl *ctrl)
 283 {
 284         u32 val;
 285
 286         /* Clear Rows and Cols */
 287         val = (SWRM_MAX_ROW_VAL << SWRM_MCP_FRAME_CTRL_BANK_ROW_CTRL_SHFT |
 288                SWRM_MIN_COL_VAL << SWRM_MCP_FRAME_CTRL_BANK_COL_CTRL_SHFT);
 289
 290         ctrl->reg_write(ctrl, SWRM_MCP_FRAME_CTRL_BANK_ADDR(0), val);
 291
 292         /* Disable Auto enumeration */
 293         ctrl->reg_write(ctrl, SWRM_ENUMERATOR_CFG_ADDR, 0);
 294
 295         /* Mask soundwire interrupts */
 296         ctrl->reg_write(ctrl, SWRM_INTERRUPT_MASK_ADDR,
 297                         SWRM_INTERRUPT_STATUS_RMSK);
 298
 299         /* Configure No pings */
 300         ctrl->reg_read(ctrl, SWRM_MCP_CFG_ADDR, &val);
 301         val &= ~SWRM_MCP_CFG_MAX_NUM_OF_CMD_NO_PINGS_BMSK;
 302         val |= (SWRM_DEF_CMD_NO_PINGS <<
 303                 SWRM_MCP_CFG_MAX_NUM_OF_CMD_NO_PINGS_SHFT);
 304         ctrl->reg_write(ctrl, SWRM_MCP_CFG_ADDR, val);
 305
 306         /* Configure number of retries of a read/write cmd */
 307         ctrl->reg_write(ctrl, SWRM_CMD_FIFO_CFG_ADDR, SWRM_RD_WR_CMD_RETRIES);
 308
 309         /* Set IRQ to PULSE */
 310         ctrl->reg_write(ctrl, SWRM_COMP_CFG_ADDR,
 311                         SWRM_COMP_CFG_IRQ_LEVEL_OR_PULSE_MSK |
 312                         SWRM_COMP_CFG_ENABLE_MSK);
 313         return 0;
 314 }
 315
 316 static enum sdw_command_response qcom_swrm_xfer_msg(struct sdw_bus *bus,
 317                                                     struct sdw_msg *msg)
 318 {
 319         struct qcom_swrm_ctrl *ctrl = to_qcom_sdw(bus);
 320         int ret, i, len;
 321
 322         if (msg->flags == SDW_MSG_FLAG_READ) {
 323                 for (i = 0; i < msg->len;) {
 324                         if ((msg->len - i) < QCOM_SWRM_MAX_RD_LEN)
 325                                 len = msg->len - i;
 326                         else
 327                                 len = QCOM_SWRM_MAX_RD_LEN;
 328
 329                         ret = qcom_swrm_cmd_fifo_rd_cmd(ctrl, msg->dev_num,
 330                                                         msg->addr + i, len,
 331                                                        &msg->buf[i]);
 332                         if (ret)
 333                                 return ret;
 334
 335                         i = i + len;
 336                 }
 337         } else if (msg->flags == SDW_MSG_FLAG_WRITE) {
 338                 for (i = 0; i < msg->len; i++) {
 339                         ret = qcom_swrm_cmd_fifo_wr_cmd(ctrl, msg->buf[i],
 340                                                         msg->dev_num,
 341                                                        msg->addr + i);
 342                         if (ret)
 343                                 return SDW_CMD_IGNORED;
 344                 }
 345         }
 346
 347         return SDW_CMD_OK;
 348 }
 349
 350 static int qcom_swrm_pre_bank_switch(struct sdw_bus *bus)
 351 {
 352         u32 reg = SWRM_MCP_FRAME_CTRL_BANK_ADDR(bus->params.next_bank);
 353         struct qcom_swrm_ctrl *ctrl = to_qcom_sdw(bus);
 354         u32 val;
 355
 356         ctrl->reg_read(ctrl, reg, &val);
 357
 358         val &= ~SWRM_MCP_FRAME_CTRL_BANK_COL_CTRL_BMSK;
 359         val &= ~SWRM_MCP_FRAME_CTRL_BANK_ROW_CTRL_BMSK;
 360
 361         val |= (SWRM_MAX_ROW_VAL << SWRM_MCP_FRAME_CTRL_BANK_ROW_CTRL_SHFT |
 362                 SWRM_MAX_COL_VAL << SWRM_MCP_FRAME_CTRL_BANK_COL_CTRL_SHFT);
 363
 364         return ctrl->reg_write(ctrl, reg, val);
 365 }
 366
 367 static int qcom_swrm_port_params(struct sdw_bus *bus,
 368                                  struct sdw_port_params *p_params,
 369                                  unsigned int bank)
 370 {
 371         /* TBD */
 372         return 0;
 373 }
 374
 375 static int qcom_swrm_transport_params(struct sdw_bus *bus,
 376                                       struct sdw_transport_params *params,
 377                                       enum sdw_reg_bank bank)
 378 {
 379         struct qcom_swrm_ctrl *ctrl = to_qcom_sdw(bus);
 380         u32 value;
 381
 382         value = params->offset1 << SWRM_DP_PORT_CTRL_OFFSET1_SHFT;
 383         value |= params->offset2 << SWRM_DP_PORT_CTRL_OFFSET2_SHFT;
 384         value |= params->sample_interval - 1;
 385
 386         return ctrl->reg_write(ctrl,
 387                                SWRM_DP_PORT_CTRL_BANK((params->port_num), bank),
 388                                value);
 389 }
 390
 391 static int qcom_swrm_port_enable(struct sdw_bus *bus,
 392                                  struct sdw_enable_ch *enable_ch,
 393                                  unsigned int bank)
 394 {
 395         u32 reg = SWRM_DP_PORT_CTRL_BANK(enable_ch->port_num, bank);
 396         struct qcom_swrm_ctrl *ctrl = to_qcom_sdw(bus);
 397         u32 val;
 398
 399         ctrl->reg_read(ctrl, reg, &val);
 400
 401         if (enable_ch->enable)
 402                 val |= (enable_ch->ch_mask << SWRM_DP_PORT_CTRL_EN_CHAN_SHFT);
 403         else
 404                 val &= ~(0xff << SWRM_DP_PORT_CTRL_EN_CHAN_SHFT);
 405
 406         return ctrl->reg_write(ctrl, reg, val);
 407 }
 408
 409 static const struct sdw_master_port_ops qcom_swrm_port_ops = {
 410         .dpn_set_port_params = qcom_swrm_port_params,
 411         .dpn_set_port_transport_params = qcom_swrm_transport_params,
 412         .dpn_port_enable_ch = qcom_swrm_port_enable,
 413 };
 414
 415 static const struct sdw_master_ops qcom_swrm_ops = {
 416         .xfer_msg = qcom_swrm_xfer_msg,
 417         .pre_bank_switch = qcom_swrm_pre_bank_switch,
 418 };
 419
 420 static int qcom_swrm_compute_params(struct sdw_bus *bus)
 421 {
 422         struct qcom_swrm_ctrl *ctrl = to_qcom_sdw(bus);
 423         struct sdw_master_runtime *m_rt;
 424         struct sdw_slave_runtime *s_rt;
 425         struct sdw_port_runtime *p_rt;
 426         struct qcom_swrm_port_config *pcfg;
 427         int i = 0;
 428
 429         list_for_each_entry(m_rt, &bus->m_rt_list, bus_node) {
 430                 list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
 431                         pcfg = &ctrl->pconfig[p_rt->num - 1];
 432                         p_rt->transport_params.port_num = p_rt->num;
 433                         p_rt->transport_params.sample_interval = pcfg->si + 1;
 434                         p_rt->transport_params.offset1 = pcfg->off1;
 435                         p_rt->transport_params.offset2 = pcfg->off2;
 436                 }
 437
 438                 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 439                         list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
 440                                 pcfg = &ctrl->pconfig[i];
 441                                 p_rt->transport_params.port_num = p_rt->num;
 442                                 p_rt->transport_params.sample_interval =
 443                                         pcfg->si + 1;
 444                                 p_rt->transport_params.offset1 = pcfg->off1;
 445                                 p_rt->transport_params.offset2 = pcfg->off2;
 446                                 i++;
 447                         }
 448                 }
 449         }
 450
 451         return 0;
 452 }
 453
 454 static u32 qcom_swrm_freq_tbl[MAX_FREQ_NUM] = {
 455         DEFAULT_CLK_FREQ,
 456 };
 457
 458 static void qcom_swrm_slave_wq(struct work_struct *work)
 459 {
 460         struct qcom_swrm_ctrl *ctrl =
 461                         container_of(work, struct qcom_swrm_ctrl, slave_work);
 462
 463         qcom_swrm_get_device_status(ctrl);
 464         sdw_handle_slave_status(&ctrl->bus, ctrl->status);
 465 }
 466
 467
 468 static void qcom_swrm_stream_free_ports(struct qcom_swrm_ctrl *ctrl,
 469                                         struct sdw_stream_runtime *stream)
 470 {
 471         struct sdw_master_runtime *m_rt;
 472         struct sdw_port_runtime *p_rt;
 473         unsigned long *port_mask;
 474
 475         mutex_lock(&ctrl->port_lock);
 476
 477         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 478                 if (m_rt->direction == SDW_DATA_DIR_RX)
 479                         port_mask = &ctrl->dout_port_mask;
 480                 else
 481                         port_mask = &ctrl->din_port_mask;
 482
 483                 list_for_each_entry(p_rt, &m_rt->port_list, port_node)
 484                         clear_bit(p_rt->num - 1, port_mask);
 485         }
 486
 487         mutex_unlock(&ctrl->port_lock);
 488 }
 489
 490 static int qcom_swrm_stream_alloc_ports(struct qcom_swrm_ctrl *ctrl,
 491                                         struct sdw_stream_runtime *stream,
 492                                        struct snd_pcm_hw_params *params,
 493                                        int direction)
 494 {
 495         struct sdw_port_config pconfig[QCOM_SDW_MAX_PORTS];
 496         struct sdw_stream_config sconfig;
 497         struct sdw_master_runtime *m_rt;
 498         struct sdw_slave_runtime *s_rt;
 499         struct sdw_port_runtime *p_rt;
 500         unsigned long *port_mask;
 501         int i, maxport, pn, nports = 0, ret = 0;
 502
 503         mutex_lock(&ctrl->port_lock);
 504         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 505                 if (m_rt->direction == SDW_DATA_DIR_RX) {
 506                         maxport = ctrl->num_dout_ports;
 507                         port_mask = &ctrl->dout_port_mask;
 508                 } else {
 509                         maxport = ctrl->num_din_ports;
 510                         port_mask = &ctrl->din_port_mask;
 511                 }
 512
 513                 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 514                         list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
 515                                 /* Port numbers start from 1 - 14*/
 516                                 pn = find_first_zero_bit(port_mask, maxport);
 517                                 if (pn > (maxport - 1)) {
 518                                         dev_err(ctrl->dev, "All ports busy\n");
 519                                         ret = -EBUSY;
 520                                         goto err;
 521                                 }
 522                                 set_bit(pn, port_mask);
 523                                 pconfig[nports].num = pn + 1;
 524                                 pconfig[nports].ch_mask = p_rt->ch_mask;
 525                                 nports++;
 526                         }
 527                 }
 528         }
 529
 530         if (direction == SNDRV_PCM_STREAM_CAPTURE)
 531                 sconfig.direction = SDW_DATA_DIR_TX;
 532         else
 533                 sconfig.direction = SDW_DATA_DIR_RX;
 534
 535         /* hw parameters wil be ignored as we only support PDM */
 536         sconfig.ch_count = 1;
 537         sconfig.frame_rate = params_rate(params);
 538         sconfig.type = stream->type;
 539         sconfig.bps = 1;
 540         sdw_stream_add_master(&ctrl->bus, &sconfig, pconfig,
 541                               nports, stream);
 542 err:
 543         if (ret) {
 544                 for (i = 0; i < nports; i++)
 545                         clear_bit(pconfig[i].num - 1, port_mask);
 546         }
 547
 548         mutex_unlock(&ctrl->port_lock);
 549
 550         return ret;
 551 }
 552
 553 static int qcom_swrm_hw_params(struct snd_pcm_substream *substream,
 554                                struct snd_pcm_hw_params *params,
 555                               struct snd_soc_dai *dai)
 556 {
 557         struct qcom_swrm_ctrl *ctrl = dev_get_drvdata(dai->dev);
 558         struct sdw_stream_runtime *sruntime = ctrl->sruntime[dai->id];
 559         int ret;
 560
 561         ret = qcom_swrm_stream_alloc_ports(ctrl, sruntime, params,
 562                                            substream->stream);
 563         if (ret)
 564                 qcom_swrm_stream_free_ports(ctrl, sruntime);
 565
 566         return ret;
 567 }
 568
 569 static int qcom_swrm_hw_free(struct snd_pcm_substream *substream,
 570                              struct snd_soc_dai *dai)
 571 {
 572         struct qcom_swrm_ctrl *ctrl = dev_get_drvdata(dai->dev);
 573         struct sdw_stream_runtime *sruntime = ctrl->sruntime[dai->id];
 574
 575         qcom_swrm_stream_free_ports(ctrl, sruntime);
 576         sdw_stream_remove_master(&ctrl->bus, sruntime);
 577
 578         return 0;
 579 }
 580
 581 static int qcom_swrm_set_sdw_stream(struct snd_soc_dai *dai,
 582                                     void *stream, int direction)
 583 {
 584         struct qcom_swrm_ctrl *ctrl = dev_get_drvdata(dai->dev);
 585
 586         ctrl->sruntime[dai->id] = stream;
 587
 588         return 0;
 589 }
 590
 591 static void *qcom_swrm_get_sdw_stream(struct snd_soc_dai *dai, int direction)
 592 {
 593         struct qcom_swrm_ctrl *ctrl = dev_get_drvdata(dai->dev);
 594
 595         return ctrl->sruntime[dai->id];
 596 }
 597
 598 static int qcom_swrm_startup(struct snd_pcm_substream *substream,
 599                              struct snd_soc_dai *dai)
 600 {
 601         struct qcom_swrm_ctrl *ctrl = dev_get_drvdata(dai->dev);
 602         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 603         struct sdw_stream_runtime *sruntime;
 604         struct snd_soc_dai *codec_dai;
 605         int ret, i;
 606
 607         sruntime = sdw_alloc_stream(dai->name);
 608         if (!sruntime)
 609                 return -ENOMEM;
 610
 611         ctrl->sruntime[dai->id] = sruntime;
 612
 613         for_each_rtd_codec_dais(rtd, i, codec_dai) {
 614                 ret = snd_soc_dai_set_sdw_stream(codec_dai, sruntime,
 615                                                  substream->stream);
 616                 if (ret < 0 && ret != -ENOTSUPP) {
 617                         dev_err(dai->dev, "Failed to set sdw stream on %s",
 618                                 codec_dai->name);
 619                         sdw_release_stream(sruntime);
 620                         return ret;
 621                 }
 622         }
 623
 624         return 0;
 625 }
 626
 627 static void qcom_swrm_shutdown(struct snd_pcm_substream *substream,
 628                                struct snd_soc_dai *dai)
 629 {
 630         struct qcom_swrm_ctrl *ctrl = dev_get_drvdata(dai->dev);
 631
 632         sdw_release_stream(ctrl->sruntime[dai->id]);
 633         ctrl->sruntime[dai->id] = NULL;
 634 }
 635
 636 static const struct snd_soc_dai_ops qcom_swrm_pdm_dai_ops = {
 637         .hw_params = qcom_swrm_hw_params,
 638         .hw_free = qcom_swrm_hw_free,
 639         .startup = qcom_swrm_startup,
 640         .shutdown = qcom_swrm_shutdown,
 641         .set_sdw_stream = qcom_swrm_set_sdw_stream,
 642         .get_sdw_stream = qcom_swrm_get_sdw_stream,
 643 };
 644
 645 static const struct snd_soc_component_driver qcom_swrm_dai_component = {
 646         .name = "soundwire",
 647 };
 648
 649 static int qcom_swrm_register_dais(struct qcom_swrm_ctrl *ctrl)
 650 {
 651         int num_dais = ctrl->num_dout_ports + ctrl->num_din_ports;
 652         struct snd_soc_dai_driver *dais;
 653         struct snd_soc_pcm_stream *stream;
 654         struct device *dev = ctrl->dev;
 655         int i;
 656
 657         /* PDM dais are only tested for now */
 658         dais = devm_kcalloc(dev, num_dais, sizeof(*dais), GFP_KERNEL);
 659         if (!dais)
 660                 return -ENOMEM;
 661
 662         for (i = 0; i < num_dais; i++) {
 663                 dais[i].name = devm_kasprintf(dev, GFP_KERNEL, "SDW Pin%d", i);
 664                 if (!dais[i].name)
 665                         return -ENOMEM;
 666
 667                 if (i < ctrl->num_dout_ports)
 668                         stream = &dais[i].playback;
 669                 else
 670                         stream = &dais[i].capture;
 671
 672                 stream->channels_min = 1;
 673                 stream->channels_max = 1;
 674                 stream->rates = SNDRV_PCM_RATE_48000;
 675                 stream->formats = SNDRV_PCM_FMTBIT_S16_LE;
 676
 677                 dais[i].ops = &qcom_swrm_pdm_dai_ops;
 678                 dais[i].id = i;
 679         }
 680
 681         return devm_snd_soc_register_component(ctrl->dev,
 682                                                 &qcom_swrm_dai_component,
 683                                                 dais, num_dais);
 684 }
 685
 686 static int qcom_swrm_get_port_config(struct qcom_swrm_ctrl *ctrl)
 687 {
 688         struct device_node *np = ctrl->dev->of_node;
 689         u8 off1[QCOM_SDW_MAX_PORTS];
 690         u8 off2[QCOM_SDW_MAX_PORTS];
 691         u8 si[QCOM_SDW_MAX_PORTS];
 692         int i, ret, nports, val;
 693
 694         ctrl->reg_read(ctrl, SWRM_COMP_PARAMS, &val);
 695
 696         ctrl->num_dout_ports = val & SWRM_COMP_PARAMS_DOUT_PORTS_MASK;
 697         ctrl->num_din_ports = (val & SWRM_COMP_PARAMS_DIN_PORTS_MASK) >> 5;
 698
 699         ret = of_property_read_u32(np, "qcom,din-ports", &val);
 700         if (ret)
 701                 return ret;
 702
 703         if (val > ctrl->num_din_ports)
 704                 return -EINVAL;
 705
 706         ctrl->num_din_ports = val;
 707
 708         ret = of_property_read_u32(np, "qcom,dout-ports", &val);
 709         if (ret)
 710                 return ret;
 711
 712         if (val > ctrl->num_dout_ports)
 713                 return -EINVAL;
 714
 715         ctrl->num_dout_ports = val;
 716
 717         nports = ctrl->num_dout_ports + ctrl->num_din_ports;
 718
 719         ret = of_property_read_u8_array(np, "qcom,ports-offset1",
 720                                         off1, nports);
 721         if (ret)
 722                 return ret;
 723
 724         ret = of_property_read_u8_array(np, "qcom,ports-offset2",
 725                                         off2, nports);
 726         if (ret)
 727                 return ret;
 728
 729         ret = of_property_read_u8_array(np, "qcom,ports-sinterval-low",
 730                                         si, nports);
 731         if (ret)
 732                 return ret;
 733
 734         for (i = 0; i < nports; i++) {
 735                 ctrl->pconfig[i].si = si[i];
 736                 ctrl->pconfig[i].off1 = off1[i];
 737                 ctrl->pconfig[i].off2 = off2[i];
 738         }
 739
 740         return 0;
 741 }
 742
 743 static int qcom_swrm_probe(struct platform_device *pdev)
 744 {
 745         struct device *dev = &pdev->dev;
 746         struct sdw_master_prop *prop;
 747         struct sdw_bus_params *params;
 748         struct qcom_swrm_ctrl *ctrl;
 749         int ret;
 750         u32 val;
 751
 752         ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
 753         if (!ctrl)
 754                 return -ENOMEM;
 755
 756         if (dev->parent->bus == &slimbus_bus) {
 757                 ctrl->reg_read = qcom_swrm_abh_reg_read;
 758                 ctrl->reg_write = qcom_swrm_ahb_reg_write;
 759                 ctrl->regmap = dev_get_regmap(dev->parent, NULL);
 760                 if (!ctrl->regmap)
 761                         return -EINVAL;
 762         } else {
 763                 /* Only WCD based SoundWire controller is supported */
 764                 return -ENOTSUPP;
 765         }
 766
 767         ctrl->irq = of_irq_get(dev->of_node, 0);
 768         if (ctrl->irq < 0) {
 769                 ret = ctrl->irq;
 770                 goto err_init;
 771         }
 772
 773         ctrl->hclk = devm_clk_get(dev, "iface");
 774         if (IS_ERR(ctrl->hclk)) {
 775                 ret = PTR_ERR(ctrl->hclk);
 776                 goto err_init;
 777         }
 778
 779         clk_prepare_enable(ctrl->hclk);
 780
 781         ctrl->dev = dev;
 782         dev_set_drvdata(&pdev->dev, ctrl);
 783         spin_lock_init(&ctrl->comp_lock);
 784         mutex_init(&ctrl->port_lock);
 785         INIT_WORK(&ctrl->slave_work, qcom_swrm_slave_wq);
 786
 787         ctrl->bus.ops = &qcom_swrm_ops;
 788         ctrl->bus.port_ops = &qcom_swrm_port_ops;
 789         ctrl->bus.compute_params = &qcom_swrm_compute_params;
 790
 791         ret = qcom_swrm_get_port_config(ctrl);
 792         if (ret)
 793                 goto err_clk;
 794
 795         params = &ctrl->bus.params;
 796         params->max_dr_freq = DEFAULT_CLK_FREQ;
 797         params->curr_dr_freq = DEFAULT_CLK_FREQ;
 798         params->col = SWRM_DEFAULT_COL;
 799         params->row = SWRM_DEFAULT_ROWS;
 800         ctrl->reg_read(ctrl, SWRM_MCP_STATUS, &val);
 801         params->curr_bank = val & SWRM_MCP_STATUS_BANK_NUM_MASK;
 802         params->next_bank = !params->curr_bank;
 803
 804         prop = &ctrl->bus.prop;
 805         prop->max_clk_freq = DEFAULT_CLK_FREQ;
 806         prop->num_clk_gears = 0;
 807         prop->num_clk_freq = MAX_FREQ_NUM;
 808         prop->clk_freq = &qcom_swrm_freq_tbl[0];
 809         prop->default_col = SWRM_DEFAULT_COL;
 810         prop->default_row = SWRM_DEFAULT_ROWS;
 811
 812         ctrl->reg_read(ctrl, SWRM_COMP_HW_VERSION, &ctrl->version);
 813
 814         ret = devm_request_threaded_irq(dev, ctrl->irq, NULL,
 815                                         qcom_swrm_irq_handler,
 816                                         IRQF_TRIGGER_RISING |
 817                                         IRQF_ONESHOT,
 818                                         "soundwire", ctrl);
 819         if (ret) {
 820                 dev_err(dev, "Failed to request soundwire irq\n");
 821                 goto err_clk;
 822         }
 823
 824         ret = sdw_bus_master_add(&ctrl->bus, dev, dev->fwnode);
 825         if (ret) {
 826                 dev_err(dev, "Failed to register Soundwire controller (%d)\n",
 827                         ret);
 828                 goto err_clk;
 829         }
 830
 831         qcom_swrm_init(ctrl);
 832         ret = qcom_swrm_register_dais(ctrl);
 833         if (ret)
 834                 goto err_master_add;
 835
 836         dev_info(dev, "Qualcomm Soundwire controller v%x.%x.%x Registered\n",
 837                  (ctrl->version >> 24) & 0xff, (ctrl->version >> 16) & 0xff,
 838                  ctrl->version & 0xffff);
 839
 840         return 0;
 841
 842 err_master_add:
 843         sdw_bus_master_delete(&ctrl->bus);
 844 err_clk:
 845         clk_disable_unprepare(ctrl->hclk);
 846 err_init:
 847         return ret;
 848 }
 849
 850 static int qcom_swrm_remove(struct platform_device *pdev)
 851 {
 852         struct qcom_swrm_ctrl *ctrl = dev_get_drvdata(&pdev->dev);
 853
 854         sdw_bus_master_delete(&ctrl->bus);
 855         clk_disable_unprepare(ctrl->hclk);
 856
 857         return 0;
 858 }
 859
 860 static const struct of_device_id qcom_swrm_of_match[] = {
 861         { .compatible = "qcom,soundwire-v1.3.0", },
 862         {/* sentinel */},
 863 };
 864
 865 MODULE_DEVICE_TABLE(of, qcom_swrm_of_match);
 866
 867 static struct platform_driver qcom_swrm_driver = {
 868         .probe  = &qcom_swrm_probe,
 869         .remove = &qcom_swrm_remove,
 870         .driver = {
 871                 .name   = "qcom-soundwire",
 872                 .of_match_table = qcom_swrm_of_match,
 873         }
 874 };
 875 module_platform_driver(qcom_swrm_driver);
 876
 877 MODULE_DESCRIPTION("Qualcomm soundwire driver");
 878 MODULE_LICENSE("GPL v2");