drivers/slimbus/qcom-ctrl.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2011-2017, The Linux Foundation
   4  */
   5
   6 #include <linux/irq.h>
   7 #include <linux/kernel.h>
   8 #include <linux/init.h>
   9 #include <linux/slab.h>
  10 #include <linux/io.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/delay.h>
  14 #include <linux/clk.h>
  15 #include <linux/of.h>
  16 #include <linux/pm_runtime.h>
  17 #include "slimbus.h"
  18
  19 /* Manager registers */
  20 #define MGR_CFG         0x200
  21 #define MGR_STATUS      0x204
  22 #define MGR_INT_EN      0x210
  23 #define MGR_INT_STAT    0x214
  24 #define MGR_INT_CLR     0x218
  25 #define MGR_TX_MSG      0x230
  26 #define MGR_RX_MSG      0x270
  27 #define MGR_IE_STAT     0x2F0
  28 #define MGR_VE_STAT     0x300
  29 #define MGR_CFG_ENABLE  1
  30
  31 /* Framer registers */
  32 #define FRM_CFG         0x400
  33 #define FRM_STAT        0x404
  34 #define FRM_INT_EN      0x410
  35 #define FRM_INT_STAT    0x414
  36 #define FRM_INT_CLR     0x418
  37 #define FRM_WAKEUP      0x41C
  38 #define FRM_CLKCTL_DONE 0x420
  39 #define FRM_IE_STAT     0x430
  40 #define FRM_VE_STAT     0x440
  41
  42 /* Interface registers */
  43 #define INTF_CFG        0x600
  44 #define INTF_STAT       0x604
  45 #define INTF_INT_EN     0x610
  46 #define INTF_INT_STAT   0x614
  47 #define INTF_INT_CLR    0x618
  48 #define INTF_IE_STAT    0x630
  49 #define INTF_VE_STAT    0x640
  50
  51 /* Interrupt status bits */
  52 #define MGR_INT_TX_NACKED_2     BIT(25)
  53 #define MGR_INT_MSG_BUF_CONTE   BIT(26)
  54 #define MGR_INT_RX_MSG_RCVD     BIT(30)
  55 #define MGR_INT_TX_MSG_SENT     BIT(31)
  56
  57 /* Framer config register settings */
  58 #define FRM_ACTIVE      1
  59 #define CLK_GEAR        7
  60 #define ROOT_FREQ       11
  61 #define REF_CLK_GEAR    15
  62 #define INTR_WAKE       19
  63
  64 #define SLIM_MSG_ASM_FIRST_WORD(l, mt, mc, dt, ad) \
  65                 ((l) | ((mt) << 5) | ((mc) << 8) | ((dt) << 15) | ((ad) << 16))
  66
  67 #define SLIM_ROOT_FREQ 24576000
  68 #define QCOM_SLIM_AUTOSUSPEND 1000
  69
  70 /* MAX message size over control channel */
  71 #define SLIM_MSGQ_BUF_LEN       40
  72 #define QCOM_TX_MSGS 2
  73 #define QCOM_RX_MSGS    8
  74 #define QCOM_BUF_ALLOC_RETRIES  10
  75
  76 #define CFG_PORT(r, v) ((v) ? CFG_PORT_V2(r) : CFG_PORT_V1(r))
  77
  78 /* V2 Component registers */
  79 #define CFG_PORT_V2(r) ((r ## _V2))
  80 #define COMP_CFG_V2             4
  81 #define COMP_TRUST_CFG_V2       0x3000
  82
  83 /* V1 Component registers */
  84 #define CFG_PORT_V1(r) ((r ## _V1))
  85 #define COMP_CFG_V1             0
  86 #define COMP_TRUST_CFG_V1       0x14
  87
  88 /* Resource group info for manager, and non-ported generic device-components */
  89 #define EE_MGR_RSC_GRP  (1 << 10)
  90 #define EE_NGD_2        (2 << 6)
  91 #define EE_NGD_1        0
  92
  93 struct slim_ctrl_buf {
  94         void            *base;
  95         spinlock_t      lock;
  96         int             head;
  97         int             tail;
  98         int             sl_sz;
  99         int             n;
 100 };
 101
 102 struct qcom_slim_ctrl {
 103         struct slim_controller  ctrl;
 104         struct slim_framer      framer;
 105         struct device           *dev;
 106         void __iomem            *base;
 107         void __iomem            *slew_reg;
 108
 109         struct slim_ctrl_buf    rx;
 110         struct slim_ctrl_buf    tx;
 111
 112         struct completion       **wr_comp;
 113         int                     irq;
 114         struct workqueue_struct *rxwq;
 115         struct work_struct      wd;
 116         struct clk              *rclk;
 117         struct clk              *hclk;
 118 };
 119
 120 static void qcom_slim_queue_tx(struct qcom_slim_ctrl *ctrl, void *buf,
 121                                u8 len, u32 tx_reg)
 122 {
 123         int count = (len + 3) >> 2;
 124
 125         __iowrite32_copy(ctrl->base + tx_reg, buf, count);
 126
 127         /* Ensure Oder of subsequent writes */
 128         mb();
 129 }
 130
 131 static void *slim_alloc_rxbuf(struct qcom_slim_ctrl *ctrl)
 132 {
 133         unsigned long flags;
 134         int idx;
 135
 136         spin_lock_irqsave(&ctrl->rx.lock, flags);
 137         if ((ctrl->rx.tail + 1) % ctrl->rx.n == ctrl->rx.head) {
 138                 spin_unlock_irqrestore(&ctrl->rx.lock, flags);
 139                 dev_err(ctrl->dev, "RX QUEUE full!");
 140                 return NULL;
 141         }
 142         idx = ctrl->rx.tail;
 143         ctrl->rx.tail = (ctrl->rx.tail + 1) % ctrl->rx.n;
 144         spin_unlock_irqrestore(&ctrl->rx.lock, flags);
 145
 146         return ctrl->rx.base + (idx * ctrl->rx.sl_sz);
 147 }
 148
 149 static void slim_ack_txn(struct qcom_slim_ctrl *ctrl, int err)
 150 {
 151         struct completion *comp;
 152         unsigned long flags;
 153         int idx;
 154
 155         spin_lock_irqsave(&ctrl->tx.lock, flags);
 156         idx = ctrl->tx.head;
 157         ctrl->tx.head = (ctrl->tx.head + 1) % ctrl->tx.n;
 158         spin_unlock_irqrestore(&ctrl->tx.lock, flags);
 159
 160         comp = ctrl->wr_comp[idx];
 161         ctrl->wr_comp[idx] = NULL;
 162
 163         complete(comp);
 164 }
 165
 166 static irqreturn_t qcom_slim_handle_tx_irq(struct qcom_slim_ctrl *ctrl,
 167                                            u32 stat)
 168 {
 169         int err = 0;
 170
 171         if (stat & MGR_INT_TX_MSG_SENT)
 172                 writel_relaxed(MGR_INT_TX_MSG_SENT,
 173                                ctrl->base + MGR_INT_CLR);
 174
 175         if (stat & MGR_INT_TX_NACKED_2) {
 176                 u32 mgr_stat = readl_relaxed(ctrl->base + MGR_STATUS);
 177                 u32 mgr_ie_stat = readl_relaxed(ctrl->base + MGR_IE_STAT);
 178                 u32 frm_stat = readl_relaxed(ctrl->base + FRM_STAT);
 179                 u32 frm_cfg = readl_relaxed(ctrl->base + FRM_CFG);
 180                 u32 frm_intr_stat = readl_relaxed(ctrl->base + FRM_INT_STAT);
 181                 u32 frm_ie_stat = readl_relaxed(ctrl->base + FRM_IE_STAT);
 182                 u32 intf_stat = readl_relaxed(ctrl->base + INTF_STAT);
 183                 u32 intf_intr_stat = readl_relaxed(ctrl->base + INTF_INT_STAT);
 184                 u32 intf_ie_stat = readl_relaxed(ctrl->base + INTF_IE_STAT);
 185
 186                 writel_relaxed(MGR_INT_TX_NACKED_2, ctrl->base + MGR_INT_CLR);
 187
 188                 dev_err(ctrl->dev, "TX Nack MGR:int:0x%x, stat:0x%x\n",
 189                         stat, mgr_stat);
 190                 dev_err(ctrl->dev, "TX Nack MGR:ie:0x%x\n", mgr_ie_stat);
 191                 dev_err(ctrl->dev, "TX Nack FRM:int:0x%x, stat:0x%x\n",
 192                         frm_intr_stat, frm_stat);
 193                 dev_err(ctrl->dev, "TX Nack FRM:cfg:0x%x, ie:0x%x\n",
 194                         frm_cfg, frm_ie_stat);
 195                 dev_err(ctrl->dev, "TX Nack INTF:intr:0x%x, stat:0x%x\n",
 196                         intf_intr_stat, intf_stat);
 197                 dev_err(ctrl->dev, "TX Nack INTF:ie:0x%x\n",
 198                         intf_ie_stat);
 199                 err = -ENOTCONN;
 200         }
 201
 202         slim_ack_txn(ctrl, err);
 203
 204         return IRQ_HANDLED;
 205 }
 206
 207 static irqreturn_t qcom_slim_handle_rx_irq(struct qcom_slim_ctrl *ctrl,
 208                                            u32 stat)
 209 {
 210         u32 *rx_buf, pkt[10];
 211         bool q_rx = false;
 212         u8 mc, mt, len;
 213
 214         pkt[0] = readl_relaxed(ctrl->base + MGR_RX_MSG);
 215         mt = SLIM_HEADER_GET_MT(pkt[0]);
 216         len = SLIM_HEADER_GET_RL(pkt[0]);
 217         mc = SLIM_HEADER_GET_MC(pkt[0]>>8);
 218
 219         /*
 220          * this message cannot be handled by ISR, so
 221          * let work-queue handle it
 222          */
 223         if (mt == SLIM_MSG_MT_CORE && mc == SLIM_MSG_MC_REPORT_PRESENT) {
 224                 rx_buf = (u32 *)slim_alloc_rxbuf(ctrl);
 225                 if (!rx_buf) {
 226                         dev_err(ctrl->dev, "dropping RX:0x%x due to RX full\n",
 227                                         pkt[0]);
 228                         goto rx_ret_irq;
 229                 }
 230                 rx_buf[0] = pkt[0];
 231
 232         } else {
 233                 rx_buf = pkt;
 234         }
 235
 236         __ioread32_copy(rx_buf + 1, ctrl->base + MGR_RX_MSG + 4,
 237                         DIV_ROUND_UP(len, 4));
 238
 239         switch (mc) {
 240
 241         case SLIM_MSG_MC_REPORT_PRESENT:
 242                 q_rx = true;
 243                 break;
 244         case SLIM_MSG_MC_REPLY_INFORMATION:
 245         case SLIM_MSG_MC_REPLY_VALUE:
 246                 slim_msg_response(&ctrl->ctrl, (u8 *)(rx_buf + 1),
 247                                   (u8)(*rx_buf >> 24), (len - 4));
 248                 break;
 249         default:
 250                 dev_err(ctrl->dev, "unsupported MC,%x MT:%x\n",
 251                         mc, mt);
 252                 break;
 253         }
 254 rx_ret_irq:
 255         writel(MGR_INT_RX_MSG_RCVD, ctrl->base +
 256                        MGR_INT_CLR);
 257         if (q_rx)
 258                 queue_work(ctrl->rxwq, &ctrl->wd);
 259
 260         return IRQ_HANDLED;
 261 }
 262
 263 static irqreturn_t qcom_slim_interrupt(int irq, void *d)
 264 {
 265         struct qcom_slim_ctrl *ctrl = d;
 266         u32 stat = readl_relaxed(ctrl->base + MGR_INT_STAT);
 267         int ret = IRQ_NONE;
 268
 269         if (stat & MGR_INT_TX_MSG_SENT || stat & MGR_INT_TX_NACKED_2)
 270                 ret = qcom_slim_handle_tx_irq(ctrl, stat);
 271
 272         if (stat & MGR_INT_RX_MSG_RCVD)
 273                 ret = qcom_slim_handle_rx_irq(ctrl, stat);
 274
 275         return ret;
 276 }
 277
 278 static int qcom_clk_pause_wakeup(struct slim_controller *sctrl)
 279 {
 280         struct qcom_slim_ctrl *ctrl = dev_get_drvdata(sctrl->dev);
 281
 282         clk_prepare_enable(ctrl->hclk);
 283         clk_prepare_enable(ctrl->rclk);
 284         enable_irq(ctrl->irq);
 285
 286         writel_relaxed(1, ctrl->base + FRM_WAKEUP);
 287         /* Make sure framer wakeup write goes through before ISR fires */
 288         mb();
 289         /*
 290          * HW Workaround: Currently, slave is reporting lost-sync messages
 291          * after SLIMbus comes out of clock pause.
 292          * Transaction with slave fail before slave reports that message
 293          * Give some time for that report to come
 294          * SLIMbus wakes up in clock gear 10 at 24.576MHz. With each superframe
 295          * being 250 usecs, we wait for 5-10 superframes here to ensure
 296          * we get the message
 297          */
 298         usleep_range(1250, 2500);
 299         return 0;
 300 }
 301
 302 static void *slim_alloc_txbuf(struct qcom_slim_ctrl *ctrl,
 303                               struct slim_msg_txn *txn,
 304                               struct completion *done)
 305 {
 306         unsigned long flags;
 307         int idx;
 308
 309         spin_lock_irqsave(&ctrl->tx.lock, flags);
 310         if (((ctrl->tx.head + 1) % ctrl->tx.n) == ctrl->tx.tail) {
 311                 spin_unlock_irqrestore(&ctrl->tx.lock, flags);
 312                 dev_err(ctrl->dev, "controller TX buf unavailable");
 313                 return NULL;
 314         }
 315         idx = ctrl->tx.tail;
 316         ctrl->wr_comp[idx] = done;
 317         ctrl->tx.tail = (ctrl->tx.tail + 1) % ctrl->tx.n;
 318
 319         spin_unlock_irqrestore(&ctrl->tx.lock, flags);
 320
 321         return ctrl->tx.base + (idx * ctrl->tx.sl_sz);
 322 }
 323
 324
 325 static int qcom_xfer_msg(struct slim_controller *sctrl,
 326                          struct slim_msg_txn *txn)
 327 {
 328         struct qcom_slim_ctrl *ctrl = dev_get_drvdata(sctrl->dev);
 329         DECLARE_COMPLETION_ONSTACK(done);
 330         void *pbuf = slim_alloc_txbuf(ctrl, txn, &done);
 331         unsigned long ms = txn->rl + HZ;
 332         u8 *puc;
 333         int ret = 0, timeout, retries = QCOM_BUF_ALLOC_RETRIES;
 334         u8 la = txn->la;
 335         u32 *head;
 336         /* HW expects length field to be excluded */
 337         txn->rl--;
 338
 339         /* spin till buffer is made available */
 340         if (!pbuf) {
 341                 while (retries--) {
 342                         usleep_range(10000, 15000);
 343                         pbuf = slim_alloc_txbuf(ctrl, txn, &done);
 344                         if (pbuf)
 345                                 break;
 346                 }
 347         }
 348
 349         if (retries < 0 && !pbuf)
 350                 return -ENOMEM;
 351
 352         puc = (u8 *)pbuf;
 353         head = (u32 *)pbuf;
 354
 355         if (txn->dt == SLIM_MSG_DEST_LOGICALADDR) {
 356                 *head = SLIM_MSG_ASM_FIRST_WORD(txn->rl, txn->mt,
 357                                                 txn->mc, 0, la);
 358                 puc += 3;
 359         } else {
 360                 *head = SLIM_MSG_ASM_FIRST_WORD(txn->rl, txn->mt,
 361                                                 txn->mc, 1, la);
 362                 puc += 2;
 363         }
 364
 365         if (slim_tid_txn(txn->mt, txn->mc))
 366                 *(puc++) = txn->tid;
 367
 368         if (slim_ec_txn(txn->mt, txn->mc)) {
 369                 *(puc++) = (txn->ec & 0xFF);
 370                 *(puc++) = (txn->ec >> 8) & 0xFF;
 371         }
 372
 373         if (txn->msg && txn->msg->wbuf)
 374                 memcpy(puc, txn->msg->wbuf, txn->msg->num_bytes);
 375
 376         qcom_slim_queue_tx(ctrl, head, txn->rl, MGR_TX_MSG);
 377         timeout = wait_for_completion_timeout(&done, msecs_to_jiffies(ms));
 378
 379         if (!timeout) {
 380                 dev_err(ctrl->dev, "TX timed out:MC:0x%x,mt:0x%x", txn->mc,
 381                                         txn->mt);
 382                 ret = -ETIMEDOUT;
 383         }
 384
 385         return ret;
 386
 387 }
 388
 389 static int qcom_set_laddr(struct slim_controller *sctrl,
 390                                 struct slim_eaddr *ead, u8 laddr)
 391 {
 392         struct qcom_slim_ctrl *ctrl = dev_get_drvdata(sctrl->dev);
 393         struct {
 394                 __be16 manf_id;
 395                 __be16 prod_code;
 396                 u8 dev_index;
 397                 u8 instance;
 398                 u8 laddr;
 399         } __packed p;
 400         struct slim_val_inf msg = {0};
 401         DEFINE_SLIM_EDEST_TXN(txn, SLIM_MSG_MC_ASSIGN_LOGICAL_ADDRESS,
 402                               10, laddr, &msg);
 403         int ret;
 404
 405         p.manf_id = cpu_to_be16(ead->manf_id);
 406         p.prod_code = cpu_to_be16(ead->prod_code);
 407         p.dev_index = ead->dev_index;
 408         p.instance = ead->instance;
 409         p.laddr = laddr;
 410
 411         msg.wbuf = (void *)&p;
 412         msg.num_bytes = 7;
 413         ret = slim_do_transfer(&ctrl->ctrl, &txn);
 414
 415         if (ret)
 416                 dev_err(ctrl->dev, "set LA:0x%x failed:ret:%d\n",
 417                                   laddr, ret);
 418         return ret;
 419 }
 420
 421 static int slim_get_current_rxbuf(struct qcom_slim_ctrl *ctrl, void *buf)
 422 {
 423         unsigned long flags;
 424
 425         spin_lock_irqsave(&ctrl->rx.lock, flags);
 426         if (ctrl->rx.tail == ctrl->rx.head) {
 427                 spin_unlock_irqrestore(&ctrl->rx.lock, flags);
 428                 return -ENODATA;
 429         }
 430         memcpy(buf, ctrl->rx.base + (ctrl->rx.head * ctrl->rx.sl_sz),
 431                                 ctrl->rx.sl_sz);
 432
 433         ctrl->rx.head = (ctrl->rx.head + 1) % ctrl->rx.n;
 434         spin_unlock_irqrestore(&ctrl->rx.lock, flags);
 435
 436         return 0;
 437 }
 438
 439 static void qcom_slim_rxwq(struct work_struct *work)
 440 {
 441         u8 buf[SLIM_MSGQ_BUF_LEN];
 442         u8 mc, mt;
 443         int ret;
 444         struct qcom_slim_ctrl *ctrl = container_of(work, struct qcom_slim_ctrl,
 445                                                  wd);
 446
 447         while ((slim_get_current_rxbuf(ctrl, buf)) != -ENODATA) {
 448                 mt = SLIM_HEADER_GET_MT(buf[0]);
 449                 mc = SLIM_HEADER_GET_MC(buf[1]);
 450                 if (mt == SLIM_MSG_MT_CORE &&
 451                         mc == SLIM_MSG_MC_REPORT_PRESENT) {
 452                         struct slim_eaddr ea;
 453                         u8 laddr;
 454
 455                         ea.manf_id = be16_to_cpup((__be16 *)&buf[2]);
 456                         ea.prod_code = be16_to_cpup((__be16 *)&buf[4]);
 457                         ea.dev_index = buf[6];
 458                         ea.instance = buf[7];
 459
 460                         ret = slim_device_report_present(&ctrl->ctrl, &ea,
 461                                                          &laddr);
 462                         if (ret < 0)
 463                                 dev_err(ctrl->dev, "assign laddr failed:%d\n",
 464                                         ret);
 465                 } else {
 466                         dev_err(ctrl->dev, "unexpected message:mc:%x, mt:%x\n",
 467                                 mc, mt);
 468                 }
 469         }
 470 }
 471
 472 static void qcom_slim_prg_slew(struct platform_device *pdev,
 473                                 struct qcom_slim_ctrl *ctrl)
 474 {
 475         struct resource *slew_mem;
 476
 477         if (!ctrl->slew_reg) {
 478                 /* SLEW RATE register for this SLIMbus */
 479                 slew_mem = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 480                                 "slew");
 481                 ctrl->slew_reg = devm_ioremap(&pdev->dev, slew_mem->start,
 482                                 resource_size(slew_mem));
 483                 if (!ctrl->slew_reg)
 484                         return;
 485         }
 486
 487         writel_relaxed(1, ctrl->slew_reg);
 488         /* Make sure SLIMbus-slew rate enabling goes through */
 489         wmb();
 490 }
 491
 492 static int qcom_slim_probe(struct platform_device *pdev)
 493 {
 494         struct qcom_slim_ctrl *ctrl;
 495         struct slim_controller *sctrl;
 496         struct resource *slim_mem;
 497         int ret, ver;
 498
 499         ctrl = devm_kzalloc(&pdev->dev, sizeof(*ctrl), GFP_KERNEL);
 500         if (!ctrl)
 501                 return -ENOMEM;
 502
 503         ctrl->hclk = devm_clk_get(&pdev->dev, "iface");
 504         if (IS_ERR(ctrl->hclk))
 505                 return PTR_ERR(ctrl->hclk);
 506
 507         ctrl->rclk = devm_clk_get(&pdev->dev, "core");
 508         if (IS_ERR(ctrl->rclk))
 509                 return PTR_ERR(ctrl->rclk);
 510
 511         ret = clk_set_rate(ctrl->rclk, SLIM_ROOT_FREQ);
 512         if (ret) {
 513                 dev_err(&pdev->dev, "ref-clock set-rate failed:%d\n", ret);
 514                 return ret;
 515         }
 516
 517         ctrl->irq = platform_get_irq(pdev, 0);
 518         if (!ctrl->irq) {
 519                 dev_err(&pdev->dev, "no slimbus IRQ\n");
 520                 return -ENODEV;
 521         }
 522
 523         sctrl = &ctrl->ctrl;
 524         sctrl->dev = &pdev->dev;
 525         ctrl->dev = &pdev->dev;
 526         platform_set_drvdata(pdev, ctrl);
 527         dev_set_drvdata(ctrl->dev, ctrl);
 528
 529         slim_mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ctrl");
 530         ctrl->base = devm_ioremap_resource(ctrl->dev, slim_mem);
 531         if (IS_ERR(ctrl->base))
 532                 return PTR_ERR(ctrl->base);
 533
 534         sctrl->set_laddr = qcom_set_laddr;
 535         sctrl->xfer_msg = qcom_xfer_msg;
 536         sctrl->wakeup =  qcom_clk_pause_wakeup;
 537         ctrl->tx.n = QCOM_TX_MSGS;
 538         ctrl->tx.sl_sz = SLIM_MSGQ_BUF_LEN;
 539         ctrl->rx.n = QCOM_RX_MSGS;
 540         ctrl->rx.sl_sz = SLIM_MSGQ_BUF_LEN;
 541         ctrl->wr_comp = kcalloc(QCOM_TX_MSGS, sizeof(struct completion *),
 542                                 GFP_KERNEL);
 543         if (!ctrl->wr_comp)
 544                 return -ENOMEM;
 545
 546         spin_lock_init(&ctrl->rx.lock);
 547         spin_lock_init(&ctrl->tx.lock);
 548         INIT_WORK(&ctrl->wd, qcom_slim_rxwq);
 549         ctrl->rxwq = create_singlethread_workqueue("qcom_slim_rx");
 550         if (!ctrl->rxwq) {
 551                 dev_err(ctrl->dev, "Failed to start Rx WQ\n");
 552                 return -ENOMEM;
 553         }
 554
 555         ctrl->framer.rootfreq = SLIM_ROOT_FREQ / 8;
 556         ctrl->framer.superfreq =
 557                 ctrl->framer.rootfreq / SLIM_CL_PER_SUPERFRAME_DIV8;
 558         sctrl->a_framer = &ctrl->framer;
 559         sctrl->clkgear = SLIM_MAX_CLK_GEAR;
 560
 561         qcom_slim_prg_slew(pdev, ctrl);
 562
 563         ret = devm_request_irq(&pdev->dev, ctrl->irq, qcom_slim_interrupt,
 564                                 IRQF_TRIGGER_HIGH, "qcom_slim_irq", ctrl);
 565         if (ret) {
 566                 dev_err(&pdev->dev, "request IRQ failed\n");
 567                 goto err_request_irq_failed;
 568         }
 569
 570         ret = clk_prepare_enable(ctrl->hclk);
 571         if (ret)
 572                 goto err_hclk_enable_failed;
 573
 574         ret = clk_prepare_enable(ctrl->rclk);
 575         if (ret)
 576                 goto err_rclk_enable_failed;
 577
 578         ctrl->tx.base = devm_kcalloc(&pdev->dev, ctrl->tx.n, ctrl->tx.sl_sz,
 579                                      GFP_KERNEL);
 580         if (!ctrl->tx.base) {
 581                 ret = -ENOMEM;
 582                 goto err;
 583         }
 584
 585         ctrl->rx.base = devm_kcalloc(&pdev->dev,ctrl->rx.n, ctrl->rx.sl_sz,
 586                                      GFP_KERNEL);
 587         if (!ctrl->rx.base) {
 588                 ret = -ENOMEM;
 589                 goto err;
 590         }
 591
 592         /* Register with framework before enabling frame, clock */
 593         ret = slim_register_controller(&ctrl->ctrl);
 594         if (ret) {
 595                 dev_err(ctrl->dev, "error adding controller\n");
 596                 goto err;
 597         }
 598
 599         ver = readl_relaxed(ctrl->base);
 600         /* Version info in 16 MSbits */
 601         ver >>= 16;
 602         /* Component register initialization */
 603         writel(1, ctrl->base + CFG_PORT(COMP_CFG, ver));
 604         writel((EE_MGR_RSC_GRP | EE_NGD_2 | EE_NGD_1),
 605                                 ctrl->base + CFG_PORT(COMP_TRUST_CFG, ver));
 606
 607         writel((MGR_INT_TX_NACKED_2 |
 608                         MGR_INT_MSG_BUF_CONTE | MGR_INT_RX_MSG_RCVD |
 609                         MGR_INT_TX_MSG_SENT), ctrl->base + MGR_INT_EN);
 610         writel(1, ctrl->base + MGR_CFG);
 611         /* Framer register initialization */
 612         writel((1 << INTR_WAKE) | (0xA << REF_CLK_GEAR) |
 613                 (0xA << CLK_GEAR) | (1 << ROOT_FREQ) | (1 << FRM_ACTIVE) | 1,
 614                 ctrl->base + FRM_CFG);
 615         writel(MGR_CFG_ENABLE, ctrl->base + MGR_CFG);
 616         writel(1, ctrl->base + INTF_CFG);
 617         writel(1, ctrl->base + CFG_PORT(COMP_CFG, ver));
 618
 619         pm_runtime_use_autosuspend(&pdev->dev);
 620         pm_runtime_set_autosuspend_delay(&pdev->dev, QCOM_SLIM_AUTOSUSPEND);
 621         pm_runtime_set_active(&pdev->dev);
 622         pm_runtime_mark_last_busy(&pdev->dev);
 623         pm_runtime_enable(&pdev->dev);
 624
 625         dev_dbg(ctrl->dev, "QCOM SB controller is up:ver:0x%x!\n", ver);
 626         return 0;
 627
 628 err:
 629         clk_disable_unprepare(ctrl->rclk);
 630 err_rclk_enable_failed:
 631         clk_disable_unprepare(ctrl->hclk);
 632 err_hclk_enable_failed:
 633 err_request_irq_failed:
 634         destroy_workqueue(ctrl->rxwq);
 635         return ret;
 636 }
 637
 638 static int qcom_slim_remove(struct platform_device *pdev)
 639 {
 640         struct qcom_slim_ctrl *ctrl = platform_get_drvdata(pdev);
 641
 642         pm_runtime_disable(&pdev->dev);
 643         slim_unregister_controller(&ctrl->ctrl);
 644         destroy_workqueue(ctrl->rxwq);
 645         return 0;
 646 }
 647
 648 /*
 649  * If PM_RUNTIME is not defined, these 2 functions become helper
 650  * functions to be called from system suspend/resume.
 651  */
 652 #ifdef CONFIG_PM
 653 static int qcom_slim_runtime_suspend(struct device *device)
 654 {
 655         struct qcom_slim_ctrl *ctrl = dev_get_drvdata(device);
 656         int ret;
 657
 658         dev_dbg(device, "pm_runtime: suspending...\n");
 659         ret = slim_ctrl_clk_pause(&ctrl->ctrl, false, SLIM_CLK_UNSPECIFIED);
 660         if (ret) {
 661                 dev_err(device, "clk pause not entered:%d", ret);
 662         } else {
 663                 disable_irq(ctrl->irq);
 664                 clk_disable_unprepare(ctrl->hclk);
 665                 clk_disable_unprepare(ctrl->rclk);
 666         }
 667         return ret;
 668 }
 669
 670 static int qcom_slim_runtime_resume(struct device *device)
 671 {
 672         struct qcom_slim_ctrl *ctrl = dev_get_drvdata(device);
 673         int ret = 0;
 674
 675         dev_dbg(device, "pm_runtime: resuming...\n");
 676         ret = slim_ctrl_clk_pause(&ctrl->ctrl, true, 0);
 677         if (ret)
 678                 dev_err(device, "clk pause not exited:%d", ret);
 679         return ret;
 680 }
 681 #endif
 682
 683 #ifdef CONFIG_PM_SLEEP
 684 static int qcom_slim_suspend(struct device *dev)
 685 {
 686         int ret = 0;
 687
 688         if (!pm_runtime_enabled(dev) ||
 689                 (!pm_runtime_suspended(dev))) {
 690                 dev_dbg(dev, "system suspend");
 691                 ret = qcom_slim_runtime_suspend(dev);
 692         }
 693
 694         return ret;
 695 }
 696
 697 static int qcom_slim_resume(struct device *dev)
 698 {
 699         if (!pm_runtime_enabled(dev) || !pm_runtime_suspended(dev)) {
 700                 int ret;
 701
 702                 dev_dbg(dev, "system resume");
 703                 ret = qcom_slim_runtime_resume(dev);
 704                 if (!ret) {
 705                         pm_runtime_mark_last_busy(dev);
 706                         pm_request_autosuspend(dev);
 707                 }
 708                 return ret;
 709
 710         }
 711         return 0;
 712 }
 713 #endif /* CONFIG_PM_SLEEP */
 714
 715 static const struct dev_pm_ops qcom_slim_dev_pm_ops = {
 716         SET_SYSTEM_SLEEP_PM_OPS(qcom_slim_suspend, qcom_slim_resume)
 717         SET_RUNTIME_PM_OPS(
 718                            qcom_slim_runtime_suspend,
 719                            qcom_slim_runtime_resume,
 720                            NULL
 721         )
 722 };
 723
 724 static const struct of_device_id qcom_slim_dt_match[] = {
 725         { .compatible = "qcom,slim", },
 726         { .compatible = "qcom,apq8064-slim", },
 727         {}
 728 };
 729
 730 static struct platform_driver qcom_slim_driver = {
 731         .probe = qcom_slim_probe,
 732         .remove = qcom_slim_remove,
 733         .driver = {
 734                 .name = "qcom_slim_ctrl",
 735                 .of_match_table = qcom_slim_dt_match,
 736                 .pm = &qcom_slim_dev_pm_ops,
 737         },
 738 };
 739 module_platform_driver(qcom_slim_driver);
 740
 741 MODULE_LICENSE("GPL v2");
 742 MODULE_DESCRIPTION("Qualcomm SLIMbus Controller");