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 
qcom_slim_queue_tx(struct qcom_slim_ctrl * ctrl,void * buf,u8 len,u32 tx_reg)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 
slim_alloc_rxbuf(struct qcom_slim_ctrl * ctrl)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 
slim_ack_txn(struct qcom_slim_ctrl * ctrl,int err)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 
qcom_slim_handle_tx_irq(struct qcom_slim_ctrl * ctrl,u32 stat)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 
qcom_slim_handle_rx_irq(struct qcom_slim_ctrl * ctrl,u32 stat)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 
qcom_slim_interrupt(int irq,void * d)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 
qcom_clk_pause_wakeup(struct slim_controller * sctrl)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 
slim_alloc_txbuf(struct qcom_slim_ctrl * ctrl,struct slim_msg_txn * txn,struct completion * done)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 
qcom_xfer_msg(struct slim_controller * sctrl,struct slim_msg_txn * txn)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 
qcom_set_laddr(struct slim_controller * sctrl,struct slim_eaddr * ead,u8 laddr)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 
slim_get_current_rxbuf(struct qcom_slim_ctrl * ctrl,void * buf)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 
qcom_slim_rxwq(struct work_struct * work)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 
qcom_slim_prg_slew(struct platform_device * pdev,struct qcom_slim_ctrl * ctrl)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 
qcom_slim_probe(struct platform_device * pdev)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 < 0) {
519 		dev_err(&pdev->dev, "no slimbus IRQ\n");
520 		return ctrl->irq;
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 		dev_err(&pdev->dev, "IOremap failed\n");
533 		return PTR_ERR(ctrl->base);
534 	}
535 
536 	sctrl->set_laddr = qcom_set_laddr;
537 	sctrl->xfer_msg = qcom_xfer_msg;
538 	sctrl->wakeup =  qcom_clk_pause_wakeup;
539 	ctrl->tx.n = QCOM_TX_MSGS;
540 	ctrl->tx.sl_sz = SLIM_MSGQ_BUF_LEN;
541 	ctrl->rx.n = QCOM_RX_MSGS;
542 	ctrl->rx.sl_sz = SLIM_MSGQ_BUF_LEN;
543 	ctrl->wr_comp = kcalloc(QCOM_TX_MSGS, sizeof(struct completion *),
544 				GFP_KERNEL);
545 	if (!ctrl->wr_comp)
546 		return -ENOMEM;
547 
548 	spin_lock_init(&ctrl->rx.lock);
549 	spin_lock_init(&ctrl->tx.lock);
550 	INIT_WORK(&ctrl->wd, qcom_slim_rxwq);
551 	ctrl->rxwq = create_singlethread_workqueue("qcom_slim_rx");
552 	if (!ctrl->rxwq) {
553 		dev_err(ctrl->dev, "Failed to start Rx WQ\n");
554 		return -ENOMEM;
555 	}
556 
557 	ctrl->framer.rootfreq = SLIM_ROOT_FREQ / 8;
558 	ctrl->framer.superfreq =
559 		ctrl->framer.rootfreq / SLIM_CL_PER_SUPERFRAME_DIV8;
560 	sctrl->a_framer = &ctrl->framer;
561 	sctrl->clkgear = SLIM_MAX_CLK_GEAR;
562 
563 	qcom_slim_prg_slew(pdev, ctrl);
564 
565 	ret = devm_request_irq(&pdev->dev, ctrl->irq, qcom_slim_interrupt,
566 				IRQF_TRIGGER_HIGH, "qcom_slim_irq", ctrl);
567 	if (ret) {
568 		dev_err(&pdev->dev, "request IRQ failed\n");
569 		goto err_request_irq_failed;
570 	}
571 
572 	ret = clk_prepare_enable(ctrl->hclk);
573 	if (ret)
574 		goto err_hclk_enable_failed;
575 
576 	ret = clk_prepare_enable(ctrl->rclk);
577 	if (ret)
578 		goto err_rclk_enable_failed;
579 
580 	ctrl->tx.base = devm_kcalloc(&pdev->dev, ctrl->tx.n, ctrl->tx.sl_sz,
581 				     GFP_KERNEL);
582 	if (!ctrl->tx.base) {
583 		ret = -ENOMEM;
584 		goto err;
585 	}
586 
587 	ctrl->rx.base = devm_kcalloc(&pdev->dev,ctrl->rx.n, ctrl->rx.sl_sz,
588 				     GFP_KERNEL);
589 	if (!ctrl->rx.base) {
590 		ret = -ENOMEM;
591 		goto err;
592 	}
593 
594 	/* Register with framework before enabling frame, clock */
595 	ret = slim_register_controller(&ctrl->ctrl);
596 	if (ret) {
597 		dev_err(ctrl->dev, "error adding controller\n");
598 		goto err;
599 	}
600 
601 	ver = readl_relaxed(ctrl->base);
602 	/* Version info in 16 MSbits */
603 	ver >>= 16;
604 	/* Component register initialization */
605 	writel(1, ctrl->base + CFG_PORT(COMP_CFG, ver));
606 	writel((EE_MGR_RSC_GRP | EE_NGD_2 | EE_NGD_1),
607 				ctrl->base + CFG_PORT(COMP_TRUST_CFG, ver));
608 
609 	writel((MGR_INT_TX_NACKED_2 |
610 			MGR_INT_MSG_BUF_CONTE | MGR_INT_RX_MSG_RCVD |
611 			MGR_INT_TX_MSG_SENT), ctrl->base + MGR_INT_EN);
612 	writel(1, ctrl->base + MGR_CFG);
613 	/* Framer register initialization */
614 	writel((1 << INTR_WAKE) | (0xA << REF_CLK_GEAR) |
615 		(0xA << CLK_GEAR) | (1 << ROOT_FREQ) | (1 << FRM_ACTIVE) | 1,
616 		ctrl->base + FRM_CFG);
617 	writel(MGR_CFG_ENABLE, ctrl->base + MGR_CFG);
618 	writel(1, ctrl->base + INTF_CFG);
619 	writel(1, ctrl->base + CFG_PORT(COMP_CFG, ver));
620 
621 	pm_runtime_use_autosuspend(&pdev->dev);
622 	pm_runtime_set_autosuspend_delay(&pdev->dev, QCOM_SLIM_AUTOSUSPEND);
623 	pm_runtime_set_active(&pdev->dev);
624 	pm_runtime_mark_last_busy(&pdev->dev);
625 	pm_runtime_enable(&pdev->dev);
626 
627 	dev_dbg(ctrl->dev, "QCOM SB controller is up:ver:0x%x!\n", ver);
628 	return 0;
629 
630 err:
631 	clk_disable_unprepare(ctrl->rclk);
632 err_rclk_enable_failed:
633 	clk_disable_unprepare(ctrl->hclk);
634 err_hclk_enable_failed:
635 err_request_irq_failed:
636 	destroy_workqueue(ctrl->rxwq);
637 	return ret;
638 }
639 
qcom_slim_remove(struct platform_device * pdev)640 static int qcom_slim_remove(struct platform_device *pdev)
641 {
642 	struct qcom_slim_ctrl *ctrl = platform_get_drvdata(pdev);
643 
644 	pm_runtime_disable(&pdev->dev);
645 	slim_unregister_controller(&ctrl->ctrl);
646 	destroy_workqueue(ctrl->rxwq);
647 	return 0;
648 }
649 
650 /*
651  * If PM_RUNTIME is not defined, these 2 functions become helper
652  * functions to be called from system suspend/resume.
653  */
654 #ifdef CONFIG_PM
qcom_slim_runtime_suspend(struct device * device)655 static int qcom_slim_runtime_suspend(struct device *device)
656 {
657 	struct platform_device *pdev = to_platform_device(device);
658 	struct qcom_slim_ctrl *ctrl = platform_get_drvdata(pdev);
659 	int ret;
660 
661 	dev_dbg(device, "pm_runtime: suspending...\n");
662 	ret = slim_ctrl_clk_pause(&ctrl->ctrl, false, SLIM_CLK_UNSPECIFIED);
663 	if (ret) {
664 		dev_err(device, "clk pause not entered:%d", ret);
665 	} else {
666 		disable_irq(ctrl->irq);
667 		clk_disable_unprepare(ctrl->hclk);
668 		clk_disable_unprepare(ctrl->rclk);
669 	}
670 	return ret;
671 }
672 
qcom_slim_runtime_resume(struct device * device)673 static int qcom_slim_runtime_resume(struct device *device)
674 {
675 	struct platform_device *pdev = to_platform_device(device);
676 	struct qcom_slim_ctrl *ctrl = platform_get_drvdata(pdev);
677 	int ret = 0;
678 
679 	dev_dbg(device, "pm_runtime: resuming...\n");
680 	ret = slim_ctrl_clk_pause(&ctrl->ctrl, true, 0);
681 	if (ret)
682 		dev_err(device, "clk pause not exited:%d", ret);
683 	return ret;
684 }
685 #endif
686 
687 #ifdef CONFIG_PM_SLEEP
qcom_slim_suspend(struct device * dev)688 static int qcom_slim_suspend(struct device *dev)
689 {
690 	int ret = 0;
691 
692 	if (!pm_runtime_enabled(dev) ||
693 		(!pm_runtime_suspended(dev))) {
694 		dev_dbg(dev, "system suspend");
695 		ret = qcom_slim_runtime_suspend(dev);
696 	}
697 
698 	return ret;
699 }
700 
qcom_slim_resume(struct device * dev)701 static int qcom_slim_resume(struct device *dev)
702 {
703 	if (!pm_runtime_enabled(dev) || !pm_runtime_suspended(dev)) {
704 		int ret;
705 
706 		dev_dbg(dev, "system resume");
707 		ret = qcom_slim_runtime_resume(dev);
708 		if (!ret) {
709 			pm_runtime_mark_last_busy(dev);
710 			pm_request_autosuspend(dev);
711 		}
712 		return ret;
713 
714 	}
715 	return 0;
716 }
717 #endif /* CONFIG_PM_SLEEP */
718 
719 static const struct dev_pm_ops qcom_slim_dev_pm_ops = {
720 	SET_SYSTEM_SLEEP_PM_OPS(qcom_slim_suspend, qcom_slim_resume)
721 	SET_RUNTIME_PM_OPS(
722 			   qcom_slim_runtime_suspend,
723 			   qcom_slim_runtime_resume,
724 			   NULL
725 	)
726 };
727 
728 static const struct of_device_id qcom_slim_dt_match[] = {
729 	{ .compatible = "qcom,slim", },
730 	{ .compatible = "qcom,apq8064-slim", },
731 	{}
732 };
733 
734 static struct platform_driver qcom_slim_driver = {
735 	.probe = qcom_slim_probe,
736 	.remove = qcom_slim_remove,
737 	.driver	= {
738 		.name = "qcom_slim_ctrl",
739 		.of_match_table = qcom_slim_dt_match,
740 		.pm = &qcom_slim_dev_pm_ops,
741 	},
742 };
743 module_platform_driver(qcom_slim_driver);
744 
745 MODULE_LICENSE("GPL v2");
746 MODULE_DESCRIPTION("Qualcomm SLIMbus Controller");
747