xref: /openbmc/linux/drivers/slimbus/qcom-ctrl.c (revision e5bd61e8)
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 	if (!ctrl->slew_reg) {
476 		/* SLEW RATE register for this SLIMbus */
477 		ctrl->slew_reg = devm_platform_ioremap_resource_byname(pdev, "slew");
478 		if (IS_ERR(ctrl->slew_reg))
479 			return;
480 	}
481 
482 	writel_relaxed(1, ctrl->slew_reg);
483 	/* Make sure SLIMbus-slew rate enabling goes through */
484 	wmb();
485 }
486 
487 static int qcom_slim_probe(struct platform_device *pdev)
488 {
489 	struct qcom_slim_ctrl *ctrl;
490 	struct slim_controller *sctrl;
491 	struct resource *slim_mem;
492 	int ret, ver;
493 
494 	ctrl = devm_kzalloc(&pdev->dev, sizeof(*ctrl), GFP_KERNEL);
495 	if (!ctrl)
496 		return -ENOMEM;
497 
498 	ctrl->hclk = devm_clk_get(&pdev->dev, "iface");
499 	if (IS_ERR(ctrl->hclk))
500 		return PTR_ERR(ctrl->hclk);
501 
502 	ctrl->rclk = devm_clk_get(&pdev->dev, "core");
503 	if (IS_ERR(ctrl->rclk))
504 		return PTR_ERR(ctrl->rclk);
505 
506 	ret = clk_set_rate(ctrl->rclk, SLIM_ROOT_FREQ);
507 	if (ret) {
508 		dev_err(&pdev->dev, "ref-clock set-rate failed:%d\n", ret);
509 		return ret;
510 	}
511 
512 	ctrl->irq = platform_get_irq(pdev, 0);
513 	if (!ctrl->irq) {
514 		dev_err(&pdev->dev, "no slimbus IRQ\n");
515 		return -ENODEV;
516 	}
517 
518 	sctrl = &ctrl->ctrl;
519 	sctrl->dev = &pdev->dev;
520 	ctrl->dev = &pdev->dev;
521 	platform_set_drvdata(pdev, ctrl);
522 	dev_set_drvdata(ctrl->dev, ctrl);
523 
524 	slim_mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ctrl");
525 	ctrl->base = devm_ioremap_resource(ctrl->dev, slim_mem);
526 	if (IS_ERR(ctrl->base))
527 		return PTR_ERR(ctrl->base);
528 
529 	sctrl->set_laddr = qcom_set_laddr;
530 	sctrl->xfer_msg = qcom_xfer_msg;
531 	sctrl->wakeup =  qcom_clk_pause_wakeup;
532 	ctrl->tx.n = QCOM_TX_MSGS;
533 	ctrl->tx.sl_sz = SLIM_MSGQ_BUF_LEN;
534 	ctrl->rx.n = QCOM_RX_MSGS;
535 	ctrl->rx.sl_sz = SLIM_MSGQ_BUF_LEN;
536 	ctrl->wr_comp = kcalloc(QCOM_TX_MSGS, sizeof(struct completion *),
537 				GFP_KERNEL);
538 	if (!ctrl->wr_comp)
539 		return -ENOMEM;
540 
541 	spin_lock_init(&ctrl->rx.lock);
542 	spin_lock_init(&ctrl->tx.lock);
543 	INIT_WORK(&ctrl->wd, qcom_slim_rxwq);
544 	ctrl->rxwq = create_singlethread_workqueue("qcom_slim_rx");
545 	if (!ctrl->rxwq) {
546 		dev_err(ctrl->dev, "Failed to start Rx WQ\n");
547 		return -ENOMEM;
548 	}
549 
550 	ctrl->framer.rootfreq = SLIM_ROOT_FREQ / 8;
551 	ctrl->framer.superfreq =
552 		ctrl->framer.rootfreq / SLIM_CL_PER_SUPERFRAME_DIV8;
553 	sctrl->a_framer = &ctrl->framer;
554 	sctrl->clkgear = SLIM_MAX_CLK_GEAR;
555 
556 	qcom_slim_prg_slew(pdev, ctrl);
557 
558 	ret = devm_request_irq(&pdev->dev, ctrl->irq, qcom_slim_interrupt,
559 				IRQF_TRIGGER_HIGH, "qcom_slim_irq", ctrl);
560 	if (ret) {
561 		dev_err(&pdev->dev, "request IRQ failed\n");
562 		goto err_request_irq_failed;
563 	}
564 
565 	ret = clk_prepare_enable(ctrl->hclk);
566 	if (ret)
567 		goto err_hclk_enable_failed;
568 
569 	ret = clk_prepare_enable(ctrl->rclk);
570 	if (ret)
571 		goto err_rclk_enable_failed;
572 
573 	ctrl->tx.base = devm_kcalloc(&pdev->dev, ctrl->tx.n, ctrl->tx.sl_sz,
574 				     GFP_KERNEL);
575 	if (!ctrl->tx.base) {
576 		ret = -ENOMEM;
577 		goto err;
578 	}
579 
580 	ctrl->rx.base = devm_kcalloc(&pdev->dev,ctrl->rx.n, ctrl->rx.sl_sz,
581 				     GFP_KERNEL);
582 	if (!ctrl->rx.base) {
583 		ret = -ENOMEM;
584 		goto err;
585 	}
586 
587 	/* Register with framework before enabling frame, clock */
588 	ret = slim_register_controller(&ctrl->ctrl);
589 	if (ret) {
590 		dev_err(ctrl->dev, "error adding controller\n");
591 		goto err;
592 	}
593 
594 	ver = readl_relaxed(ctrl->base);
595 	/* Version info in 16 MSbits */
596 	ver >>= 16;
597 	/* Component register initialization */
598 	writel(1, ctrl->base + CFG_PORT(COMP_CFG, ver));
599 	writel((EE_MGR_RSC_GRP | EE_NGD_2 | EE_NGD_1),
600 				ctrl->base + CFG_PORT(COMP_TRUST_CFG, ver));
601 
602 	writel((MGR_INT_TX_NACKED_2 |
603 			MGR_INT_MSG_BUF_CONTE | MGR_INT_RX_MSG_RCVD |
604 			MGR_INT_TX_MSG_SENT), ctrl->base + MGR_INT_EN);
605 	writel(1, ctrl->base + MGR_CFG);
606 	/* Framer register initialization */
607 	writel((1 << INTR_WAKE) | (0xA << REF_CLK_GEAR) |
608 		(0xA << CLK_GEAR) | (1 << ROOT_FREQ) | (1 << FRM_ACTIVE) | 1,
609 		ctrl->base + FRM_CFG);
610 	writel(MGR_CFG_ENABLE, ctrl->base + MGR_CFG);
611 	writel(1, ctrl->base + INTF_CFG);
612 	writel(1, ctrl->base + CFG_PORT(COMP_CFG, ver));
613 
614 	pm_runtime_use_autosuspend(&pdev->dev);
615 	pm_runtime_set_autosuspend_delay(&pdev->dev, QCOM_SLIM_AUTOSUSPEND);
616 	pm_runtime_set_active(&pdev->dev);
617 	pm_runtime_mark_last_busy(&pdev->dev);
618 	pm_runtime_enable(&pdev->dev);
619 
620 	dev_dbg(ctrl->dev, "QCOM SB controller is up:ver:0x%x!\n", ver);
621 	return 0;
622 
623 err:
624 	clk_disable_unprepare(ctrl->rclk);
625 err_rclk_enable_failed:
626 	clk_disable_unprepare(ctrl->hclk);
627 err_hclk_enable_failed:
628 err_request_irq_failed:
629 	destroy_workqueue(ctrl->rxwq);
630 	return ret;
631 }
632 
633 static int qcom_slim_remove(struct platform_device *pdev)
634 {
635 	struct qcom_slim_ctrl *ctrl = platform_get_drvdata(pdev);
636 
637 	pm_runtime_disable(&pdev->dev);
638 	slim_unregister_controller(&ctrl->ctrl);
639 	clk_disable_unprepare(ctrl->rclk);
640 	clk_disable_unprepare(ctrl->hclk);
641 	destroy_workqueue(ctrl->rxwq);
642 	return 0;
643 }
644 
645 /*
646  * If PM_RUNTIME is not defined, these 2 functions become helper
647  * functions to be called from system suspend/resume.
648  */
649 #ifdef CONFIG_PM
650 static int qcom_slim_runtime_suspend(struct device *device)
651 {
652 	struct qcom_slim_ctrl *ctrl = dev_get_drvdata(device);
653 	int ret;
654 
655 	dev_dbg(device, "pm_runtime: suspending...\n");
656 	ret = slim_ctrl_clk_pause(&ctrl->ctrl, false, SLIM_CLK_UNSPECIFIED);
657 	if (ret) {
658 		dev_err(device, "clk pause not entered:%d", ret);
659 	} else {
660 		disable_irq(ctrl->irq);
661 		clk_disable_unprepare(ctrl->hclk);
662 		clk_disable_unprepare(ctrl->rclk);
663 	}
664 	return ret;
665 }
666 
667 static int qcom_slim_runtime_resume(struct device *device)
668 {
669 	struct qcom_slim_ctrl *ctrl = dev_get_drvdata(device);
670 	int ret = 0;
671 
672 	dev_dbg(device, "pm_runtime: resuming...\n");
673 	ret = slim_ctrl_clk_pause(&ctrl->ctrl, true, 0);
674 	if (ret)
675 		dev_err(device, "clk pause not exited:%d", ret);
676 	return ret;
677 }
678 #endif
679 
680 #ifdef CONFIG_PM_SLEEP
681 static int qcom_slim_suspend(struct device *dev)
682 {
683 	int ret = 0;
684 
685 	if (!pm_runtime_enabled(dev) ||
686 		(!pm_runtime_suspended(dev))) {
687 		dev_dbg(dev, "system suspend");
688 		ret = qcom_slim_runtime_suspend(dev);
689 	}
690 
691 	return ret;
692 }
693 
694 static int qcom_slim_resume(struct device *dev)
695 {
696 	if (!pm_runtime_enabled(dev) || !pm_runtime_suspended(dev)) {
697 		int ret;
698 
699 		dev_dbg(dev, "system resume");
700 		ret = qcom_slim_runtime_resume(dev);
701 		if (!ret) {
702 			pm_runtime_mark_last_busy(dev);
703 			pm_request_autosuspend(dev);
704 		}
705 		return ret;
706 
707 	}
708 	return 0;
709 }
710 #endif /* CONFIG_PM_SLEEP */
711 
712 static const struct dev_pm_ops qcom_slim_dev_pm_ops = {
713 	SET_SYSTEM_SLEEP_PM_OPS(qcom_slim_suspend, qcom_slim_resume)
714 	SET_RUNTIME_PM_OPS(
715 			   qcom_slim_runtime_suspend,
716 			   qcom_slim_runtime_resume,
717 			   NULL
718 	)
719 };
720 
721 static const struct of_device_id qcom_slim_dt_match[] = {
722 	{ .compatible = "qcom,slim", },
723 	{ .compatible = "qcom,apq8064-slim", },
724 	{}
725 };
726 
727 static struct platform_driver qcom_slim_driver = {
728 	.probe = qcom_slim_probe,
729 	.remove = qcom_slim_remove,
730 	.driver	= {
731 		.name = "qcom_slim_ctrl",
732 		.of_match_table = qcom_slim_dt_match,
733 		.pm = &qcom_slim_dev_pm_ops,
734 	},
735 };
736 module_platform_driver(qcom_slim_driver);
737 
738 MODULE_LICENSE("GPL v2");
739 MODULE_DESCRIPTION("Qualcomm SLIMbus Controller");
740