1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2 // Copyright(c) 2015-17 Intel Corporation.
3 
4 /*
5  * Cadence SoundWire Master module
6  * Used by Master driver
7  */
8 
9 #include <linux/delay.h>
10 #include <linux/device.h>
11 #include <linux/debugfs.h>
12 #include <linux/interrupt.h>
13 #include <linux/io.h>
14 #include <linux/module.h>
15 #include <linux/mod_devicetable.h>
16 #include <linux/pm_runtime.h>
17 #include <linux/soundwire/sdw_registers.h>
18 #include <linux/soundwire/sdw.h>
19 #include <sound/pcm_params.h>
20 #include <sound/soc.h>
21 #include <linux/workqueue.h>
22 #include "bus.h"
23 #include "cadence_master.h"
24 
25 static int interrupt_mask;
26 module_param_named(cnds_mcp_int_mask, interrupt_mask, int, 0444);
27 MODULE_PARM_DESC(cdns_mcp_int_mask, "Cadence MCP IntMask");
28 
29 #define CDNS_MCP_CONFIG				0x0
30 
31 #define CDNS_MCP_CONFIG_MCMD_RETRY		GENMASK(27, 24)
32 #define CDNS_MCP_CONFIG_MPREQ_DELAY		GENMASK(20, 16)
33 #define CDNS_MCP_CONFIG_MMASTER			BIT(7)
34 #define CDNS_MCP_CONFIG_BUS_REL			BIT(6)
35 #define CDNS_MCP_CONFIG_SNIFFER			BIT(5)
36 #define CDNS_MCP_CONFIG_SSPMOD			BIT(4)
37 #define CDNS_MCP_CONFIG_CMD			BIT(3)
38 #define CDNS_MCP_CONFIG_OP			GENMASK(2, 0)
39 #define CDNS_MCP_CONFIG_OP_NORMAL		0
40 
41 #define CDNS_MCP_CONTROL			0x4
42 
43 #define CDNS_MCP_CONTROL_RST_DELAY		GENMASK(10, 8)
44 #define CDNS_MCP_CONTROL_CMD_RST		BIT(7)
45 #define CDNS_MCP_CONTROL_SOFT_RST		BIT(6)
46 #define CDNS_MCP_CONTROL_SW_RST			BIT(5)
47 #define CDNS_MCP_CONTROL_HW_RST			BIT(4)
48 #define CDNS_MCP_CONTROL_CLK_PAUSE		BIT(3)
49 #define CDNS_MCP_CONTROL_CLK_STOP_CLR		BIT(2)
50 #define CDNS_MCP_CONTROL_CMD_ACCEPT		BIT(1)
51 #define CDNS_MCP_CONTROL_BLOCK_WAKEUP		BIT(0)
52 
53 #define CDNS_MCP_CMDCTRL			0x8
54 
55 #define CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR	BIT(2)
56 
57 #define CDNS_MCP_SSPSTAT			0xC
58 #define CDNS_MCP_FRAME_SHAPE			0x10
59 #define CDNS_MCP_FRAME_SHAPE_INIT		0x14
60 #define CDNS_MCP_FRAME_SHAPE_COL_MASK		GENMASK(2, 0)
61 #define CDNS_MCP_FRAME_SHAPE_ROW_MASK		GENMASK(7, 3)
62 
63 #define CDNS_MCP_CONFIG_UPDATE			0x18
64 #define CDNS_MCP_CONFIG_UPDATE_BIT		BIT(0)
65 
66 #define CDNS_MCP_PHYCTRL			0x1C
67 #define CDNS_MCP_SSP_CTRL0			0x20
68 #define CDNS_MCP_SSP_CTRL1			0x28
69 #define CDNS_MCP_CLK_CTRL0			0x30
70 #define CDNS_MCP_CLK_CTRL1			0x38
71 #define CDNS_MCP_CLK_MCLKD_MASK		GENMASK(7, 0)
72 
73 #define CDNS_MCP_STAT				0x40
74 
75 #define CDNS_MCP_STAT_ACTIVE_BANK		BIT(20)
76 #define CDNS_MCP_STAT_CLK_STOP			BIT(16)
77 
78 #define CDNS_MCP_INTSTAT			0x44
79 #define CDNS_MCP_INTMASK			0x48
80 
81 #define CDNS_MCP_INT_IRQ			BIT(31)
82 #define CDNS_MCP_INT_RESERVED1			GENMASK(30, 17)
83 #define CDNS_MCP_INT_WAKEUP			BIT(16)
84 #define CDNS_MCP_INT_SLAVE_RSVD			BIT(15)
85 #define CDNS_MCP_INT_SLAVE_ALERT		BIT(14)
86 #define CDNS_MCP_INT_SLAVE_ATTACH		BIT(13)
87 #define CDNS_MCP_INT_SLAVE_NATTACH		BIT(12)
88 #define CDNS_MCP_INT_SLAVE_MASK			GENMASK(15, 12)
89 #define CDNS_MCP_INT_DPINT			BIT(11)
90 #define CDNS_MCP_INT_CTRL_CLASH			BIT(10)
91 #define CDNS_MCP_INT_DATA_CLASH			BIT(9)
92 #define CDNS_MCP_INT_PARITY			BIT(8)
93 #define CDNS_MCP_INT_CMD_ERR			BIT(7)
94 #define CDNS_MCP_INT_RESERVED2			GENMASK(6, 4)
95 #define CDNS_MCP_INT_RX_NE			BIT(3)
96 #define CDNS_MCP_INT_RX_WL			BIT(2)
97 #define CDNS_MCP_INT_TXE			BIT(1)
98 #define CDNS_MCP_INT_TXF			BIT(0)
99 #define CDNS_MCP_INT_RESERVED (CDNS_MCP_INT_RESERVED1 | CDNS_MCP_INT_RESERVED2)
100 
101 #define CDNS_MCP_INTSET				0x4C
102 
103 #define CDNS_MCP_SLAVE_STAT			0x50
104 #define CDNS_MCP_SLAVE_STAT_MASK		GENMASK(1, 0)
105 
106 #define CDNS_MCP_SLAVE_INTSTAT0			0x54
107 #define CDNS_MCP_SLAVE_INTSTAT1			0x58
108 #define CDNS_MCP_SLAVE_INTSTAT_NPRESENT		BIT(0)
109 #define CDNS_MCP_SLAVE_INTSTAT_ATTACHED		BIT(1)
110 #define CDNS_MCP_SLAVE_INTSTAT_ALERT		BIT(2)
111 #define CDNS_MCP_SLAVE_INTSTAT_RESERVED		BIT(3)
112 #define CDNS_MCP_SLAVE_STATUS_BITS		GENMASK(3, 0)
113 #define CDNS_MCP_SLAVE_STATUS_NUM		4
114 
115 #define CDNS_MCP_SLAVE_INTMASK0			0x5C
116 #define CDNS_MCP_SLAVE_INTMASK1			0x60
117 
118 #define CDNS_MCP_SLAVE_INTMASK0_MASK		GENMASK(31, 0)
119 #define CDNS_MCP_SLAVE_INTMASK1_MASK		GENMASK(15, 0)
120 
121 #define CDNS_MCP_PORT_INTSTAT			0x64
122 #define CDNS_MCP_PDI_STAT			0x6C
123 
124 #define CDNS_MCP_FIFOLEVEL			0x78
125 #define CDNS_MCP_FIFOSTAT			0x7C
126 #define CDNS_MCP_RX_FIFO_AVAIL			GENMASK(5, 0)
127 
128 #define CDNS_MCP_CMD_BASE			0x80
129 #define CDNS_MCP_RESP_BASE			0x80
130 #define CDNS_MCP_CMD_LEN			0x20
131 #define CDNS_MCP_CMD_WORD_LEN			0x4
132 
133 #define CDNS_MCP_CMD_SSP_TAG			BIT(31)
134 #define CDNS_MCP_CMD_COMMAND			GENMASK(30, 28)
135 #define CDNS_MCP_CMD_DEV_ADDR			GENMASK(27, 24)
136 #define CDNS_MCP_CMD_REG_ADDR			GENMASK(23, 8)
137 #define CDNS_MCP_CMD_REG_DATA			GENMASK(7, 0)
138 
139 #define CDNS_MCP_CMD_READ			2
140 #define CDNS_MCP_CMD_WRITE			3
141 
142 #define CDNS_MCP_RESP_RDATA			GENMASK(15, 8)
143 #define CDNS_MCP_RESP_ACK			BIT(0)
144 #define CDNS_MCP_RESP_NACK			BIT(1)
145 
146 #define CDNS_DP_SIZE				128
147 
148 #define CDNS_DPN_B0_CONFIG(n)			(0x100 + CDNS_DP_SIZE * (n))
149 #define CDNS_DPN_B0_CH_EN(n)			(0x104 + CDNS_DP_SIZE * (n))
150 #define CDNS_DPN_B0_SAMPLE_CTRL(n)		(0x108 + CDNS_DP_SIZE * (n))
151 #define CDNS_DPN_B0_OFFSET_CTRL(n)		(0x10C + CDNS_DP_SIZE * (n))
152 #define CDNS_DPN_B0_HCTRL(n)			(0x110 + CDNS_DP_SIZE * (n))
153 #define CDNS_DPN_B0_ASYNC_CTRL(n)		(0x114 + CDNS_DP_SIZE * (n))
154 
155 #define CDNS_DPN_B1_CONFIG(n)			(0x118 + CDNS_DP_SIZE * (n))
156 #define CDNS_DPN_B1_CH_EN(n)			(0x11C + CDNS_DP_SIZE * (n))
157 #define CDNS_DPN_B1_SAMPLE_CTRL(n)		(0x120 + CDNS_DP_SIZE * (n))
158 #define CDNS_DPN_B1_OFFSET_CTRL(n)		(0x124 + CDNS_DP_SIZE * (n))
159 #define CDNS_DPN_B1_HCTRL(n)			(0x128 + CDNS_DP_SIZE * (n))
160 #define CDNS_DPN_B1_ASYNC_CTRL(n)		(0x12C + CDNS_DP_SIZE * (n))
161 
162 #define CDNS_DPN_CONFIG_BPM			BIT(18)
163 #define CDNS_DPN_CONFIG_BGC			GENMASK(17, 16)
164 #define CDNS_DPN_CONFIG_WL			GENMASK(12, 8)
165 #define CDNS_DPN_CONFIG_PORT_DAT		GENMASK(3, 2)
166 #define CDNS_DPN_CONFIG_PORT_FLOW		GENMASK(1, 0)
167 
168 #define CDNS_DPN_SAMPLE_CTRL_SI			GENMASK(15, 0)
169 
170 #define CDNS_DPN_OFFSET_CTRL_1			GENMASK(7, 0)
171 #define CDNS_DPN_OFFSET_CTRL_2			GENMASK(15, 8)
172 
173 #define CDNS_DPN_HCTRL_HSTOP			GENMASK(3, 0)
174 #define CDNS_DPN_HCTRL_HSTART			GENMASK(7, 4)
175 #define CDNS_DPN_HCTRL_LCTRL			GENMASK(10, 8)
176 
177 #define CDNS_PORTCTRL				0x130
178 #define CDNS_PORTCTRL_TEST_FAILED		BIT(1)
179 #define CDNS_PORTCTRL_DIRN			BIT(7)
180 #define CDNS_PORTCTRL_BANK_INVERT		BIT(8)
181 
182 #define CDNS_PORT_OFFSET			0x80
183 
184 #define CDNS_PDI_CONFIG(n)			(0x1100 + (n) * 16)
185 
186 #define CDNS_PDI_CONFIG_SOFT_RESET		BIT(24)
187 #define CDNS_PDI_CONFIG_CHANNEL			GENMASK(15, 8)
188 #define CDNS_PDI_CONFIG_PORT			GENMASK(4, 0)
189 
190 /* Driver defaults */
191 #define CDNS_TX_TIMEOUT				500
192 
193 #define CDNS_SCP_RX_FIFOLEVEL			0x2
194 
195 /*
196  * register accessor helpers
197  */
198 static inline u32 cdns_readl(struct sdw_cdns *cdns, int offset)
199 {
200 	return readl(cdns->registers + offset);
201 }
202 
203 static inline void cdns_writel(struct sdw_cdns *cdns, int offset, u32 value)
204 {
205 	writel(value, cdns->registers + offset);
206 }
207 
208 static inline void cdns_updatel(struct sdw_cdns *cdns,
209 				int offset, u32 mask, u32 val)
210 {
211 	u32 tmp;
212 
213 	tmp = cdns_readl(cdns, offset);
214 	tmp = (tmp & ~mask) | val;
215 	cdns_writel(cdns, offset, tmp);
216 }
217 
218 static int cdns_set_wait(struct sdw_cdns *cdns, int offset, u32 mask, u32 value)
219 {
220 	int timeout = 10;
221 	u32 reg_read;
222 
223 	/* Wait for bit to be set */
224 	do {
225 		reg_read = readl(cdns->registers + offset);
226 		if ((reg_read & mask) == value)
227 			return 0;
228 
229 		timeout--;
230 		usleep_range(50, 100);
231 	} while (timeout != 0);
232 
233 	return -ETIMEDOUT;
234 }
235 
236 static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value)
237 {
238 	writel(value, cdns->registers + offset);
239 
240 	/* Wait for bit to be self cleared */
241 	return cdns_set_wait(cdns, offset, value, 0);
242 }
243 
244 /*
245  * all changes to the MCP_CONFIG, MCP_CONTROL, MCP_CMDCTRL and MCP_PHYCTRL
246  * need to be confirmed with a write to MCP_CONFIG_UPDATE
247  */
248 static int cdns_config_update(struct sdw_cdns *cdns)
249 {
250 	int ret;
251 
252 	if (sdw_cdns_is_clock_stop(cdns)) {
253 		dev_err(cdns->dev, "Cannot program MCP_CONFIG_UPDATE in ClockStopMode\n");
254 		return -EINVAL;
255 	}
256 
257 	ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE,
258 			     CDNS_MCP_CONFIG_UPDATE_BIT);
259 	if (ret < 0)
260 		dev_err(cdns->dev, "Config update timedout\n");
261 
262 	return ret;
263 }
264 
265 /*
266  * debugfs
267  */
268 #ifdef CONFIG_DEBUG_FS
269 
270 #define RD_BUF (2 * PAGE_SIZE)
271 
272 static ssize_t cdns_sprintf(struct sdw_cdns *cdns,
273 			    char *buf, size_t pos, unsigned int reg)
274 {
275 	return scnprintf(buf + pos, RD_BUF - pos,
276 			 "%4x\t%8x\n", reg, cdns_readl(cdns, reg));
277 }
278 
279 static int cdns_reg_show(struct seq_file *s, void *data)
280 {
281 	struct sdw_cdns *cdns = s->private;
282 	char *buf;
283 	ssize_t ret;
284 	int num_ports;
285 	int i, j;
286 
287 	buf = kzalloc(RD_BUF, GFP_KERNEL);
288 	if (!buf)
289 		return -ENOMEM;
290 
291 	ret = scnprintf(buf, RD_BUF, "Register  Value\n");
292 	ret += scnprintf(buf + ret, RD_BUF - ret, "\nMCP Registers\n");
293 	/* 8 MCP registers */
294 	for (i = CDNS_MCP_CONFIG; i <= CDNS_MCP_PHYCTRL; i += sizeof(u32))
295 		ret += cdns_sprintf(cdns, buf, ret, i);
296 
297 	ret += scnprintf(buf + ret, RD_BUF - ret,
298 			 "\nStatus & Intr Registers\n");
299 	/* 13 Status & Intr registers (offsets 0x70 and 0x74 not defined) */
300 	for (i = CDNS_MCP_STAT; i <=  CDNS_MCP_FIFOSTAT; i += sizeof(u32))
301 		ret += cdns_sprintf(cdns, buf, ret, i);
302 
303 	ret += scnprintf(buf + ret, RD_BUF - ret,
304 			 "\nSSP & Clk ctrl Registers\n");
305 	ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL0);
306 	ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL1);
307 	ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL0);
308 	ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL1);
309 
310 	ret += scnprintf(buf + ret, RD_BUF - ret,
311 			 "\nDPn B0 Registers\n");
312 
313 	num_ports = cdns->num_ports;
314 
315 	for (i = 0; i < num_ports; i++) {
316 		ret += scnprintf(buf + ret, RD_BUF - ret,
317 				 "\nDP-%d\n", i);
318 		for (j = CDNS_DPN_B0_CONFIG(i);
319 		     j < CDNS_DPN_B0_ASYNC_CTRL(i); j += sizeof(u32))
320 			ret += cdns_sprintf(cdns, buf, ret, j);
321 	}
322 
323 	ret += scnprintf(buf + ret, RD_BUF - ret,
324 			 "\nDPn B1 Registers\n");
325 	for (i = 0; i < num_ports; i++) {
326 		ret += scnprintf(buf + ret, RD_BUF - ret,
327 				 "\nDP-%d\n", i);
328 
329 		for (j = CDNS_DPN_B1_CONFIG(i);
330 		     j < CDNS_DPN_B1_ASYNC_CTRL(i); j += sizeof(u32))
331 			ret += cdns_sprintf(cdns, buf, ret, j);
332 	}
333 
334 	ret += scnprintf(buf + ret, RD_BUF - ret,
335 			 "\nDPn Control Registers\n");
336 	for (i = 0; i < num_ports; i++)
337 		ret += cdns_sprintf(cdns, buf, ret,
338 				CDNS_PORTCTRL + i * CDNS_PORT_OFFSET);
339 
340 	ret += scnprintf(buf + ret, RD_BUF - ret,
341 			 "\nPDIn Config Registers\n");
342 
343 	/* number of PDI and ports is interchangeable */
344 	for (i = 0; i < num_ports; i++)
345 		ret += cdns_sprintf(cdns, buf, ret, CDNS_PDI_CONFIG(i));
346 
347 	seq_printf(s, "%s", buf);
348 	kfree(buf);
349 
350 	return 0;
351 }
352 DEFINE_SHOW_ATTRIBUTE(cdns_reg);
353 
354 static int cdns_hw_reset(void *data, u64 value)
355 {
356 	struct sdw_cdns *cdns = data;
357 	int ret;
358 
359 	if (value != 1)
360 		return -EINVAL;
361 
362 	/* Userspace changed the hardware state behind the kernel's back */
363 	add_taint(TAINT_USER, LOCKDEP_STILL_OK);
364 
365 	ret = sdw_cdns_exit_reset(cdns);
366 
367 	dev_dbg(cdns->dev, "link hw_reset done: %d\n", ret);
368 
369 	return ret;
370 }
371 
372 DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n");
373 
374 static int cdns_parity_error_injection(void *data, u64 value)
375 {
376 	struct sdw_cdns *cdns = data;
377 	struct sdw_bus *bus;
378 	int ret;
379 
380 	if (value != 1)
381 		return -EINVAL;
382 
383 	bus = &cdns->bus;
384 
385 	/*
386 	 * Resume Master device. If this results in a bus reset, the
387 	 * Slave devices will re-attach and be re-enumerated.
388 	 */
389 	ret = pm_runtime_resume_and_get(bus->dev);
390 	if (ret < 0 && ret != -EACCES) {
391 		dev_err_ratelimited(cdns->dev,
392 				    "pm_runtime_resume_and_get failed in %s, ret %d\n",
393 				    __func__, ret);
394 		return ret;
395 	}
396 
397 	/*
398 	 * wait long enough for Slave(s) to be in steady state. This
399 	 * does not need to be super precise.
400 	 */
401 	msleep(200);
402 
403 	/*
404 	 * Take the bus lock here to make sure that any bus transactions
405 	 * will be queued while we inject a parity error on a dummy read
406 	 */
407 	mutex_lock(&bus->bus_lock);
408 
409 	/* program hardware to inject parity error */
410 	cdns_updatel(cdns, CDNS_MCP_CMDCTRL,
411 		     CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR,
412 		     CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR);
413 
414 	/* commit changes */
415 	cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
416 		     CDNS_MCP_CONFIG_UPDATE_BIT,
417 		     CDNS_MCP_CONFIG_UPDATE_BIT);
418 
419 	/* do a broadcast dummy read to avoid bus clashes */
420 	ret = sdw_bread_no_pm_unlocked(&cdns->bus, 0xf, SDW_SCP_DEVID_0);
421 	dev_info(cdns->dev, "parity error injection, read: %d\n", ret);
422 
423 	/* program hardware to disable parity error */
424 	cdns_updatel(cdns, CDNS_MCP_CMDCTRL,
425 		     CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR,
426 		     0);
427 
428 	/* commit changes */
429 	cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
430 		     CDNS_MCP_CONFIG_UPDATE_BIT,
431 		     CDNS_MCP_CONFIG_UPDATE_BIT);
432 
433 	/* Continue bus operation with parity error injection disabled */
434 	mutex_unlock(&bus->bus_lock);
435 
436 	/* Userspace changed the hardware state behind the kernel's back */
437 	add_taint(TAINT_USER, LOCKDEP_STILL_OK);
438 
439 	/*
440 	 * allow Master device to enter pm_runtime suspend. This may
441 	 * also result in Slave devices suspending.
442 	 */
443 	pm_runtime_mark_last_busy(bus->dev);
444 	pm_runtime_put_autosuspend(bus->dev);
445 
446 	return 0;
447 }
448 
449 DEFINE_DEBUGFS_ATTRIBUTE(cdns_parity_error_fops, NULL,
450 			 cdns_parity_error_injection, "%llu\n");
451 
452 static int cdns_set_pdi_loopback_source(void *data, u64 value)
453 {
454 	struct sdw_cdns *cdns = data;
455 	unsigned int pdi_out_num = cdns->pcm.num_bd + cdns->pcm.num_out;
456 
457 	if (value > pdi_out_num)
458 		return -EINVAL;
459 
460 	/* Userspace changed the hardware state behind the kernel's back */
461 	add_taint(TAINT_USER, LOCKDEP_STILL_OK);
462 
463 	cdns->pdi_loopback_source = value;
464 
465 	return 0;
466 }
467 DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_source_fops, NULL, cdns_set_pdi_loopback_source, "%llu\n");
468 
469 static int cdns_set_pdi_loopback_target(void *data, u64 value)
470 {
471 	struct sdw_cdns *cdns = data;
472 	unsigned int pdi_in_num = cdns->pcm.num_bd + cdns->pcm.num_in;
473 
474 	if (value > pdi_in_num)
475 		return -EINVAL;
476 
477 	/* Userspace changed the hardware state behind the kernel's back */
478 	add_taint(TAINT_USER, LOCKDEP_STILL_OK);
479 
480 	cdns->pdi_loopback_target = value;
481 
482 	return 0;
483 }
484 DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_target_fops, NULL, cdns_set_pdi_loopback_target, "%llu\n");
485 
486 /**
487  * sdw_cdns_debugfs_init() - Cadence debugfs init
488  * @cdns: Cadence instance
489  * @root: debugfs root
490  */
491 void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root)
492 {
493 	debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops);
494 
495 	debugfs_create_file("cdns-hw-reset", 0200, root, cdns,
496 			    &cdns_hw_reset_fops);
497 
498 	debugfs_create_file("cdns-parity-error-injection", 0200, root, cdns,
499 			    &cdns_parity_error_fops);
500 
501 	cdns->pdi_loopback_source = -1;
502 	cdns->pdi_loopback_target = -1;
503 
504 	debugfs_create_file("cdns-pdi-loopback-source", 0200, root, cdns,
505 			    &cdns_pdi_loopback_source_fops);
506 
507 	debugfs_create_file("cdns-pdi-loopback-target", 0200, root, cdns,
508 			    &cdns_pdi_loopback_target_fops);
509 
510 }
511 EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init);
512 
513 #endif /* CONFIG_DEBUG_FS */
514 
515 /*
516  * IO Calls
517  */
518 static enum sdw_command_response
519 cdns_fill_msg_resp(struct sdw_cdns *cdns,
520 		   struct sdw_msg *msg, int count, int offset)
521 {
522 	int nack = 0, no_ack = 0;
523 	int i;
524 
525 	/* check message response */
526 	for (i = 0; i < count; i++) {
527 		if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
528 			no_ack = 1;
529 			dev_vdbg(cdns->dev, "Msg Ack not received, cmd %d\n", i);
530 		}
531 		if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
532 			nack = 1;
533 			dev_err_ratelimited(cdns->dev, "Msg NACK received, cmd %d\n", i);
534 		}
535 	}
536 
537 	if (nack) {
538 		dev_err_ratelimited(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num);
539 		return SDW_CMD_FAIL;
540 	}
541 
542 	if (no_ack) {
543 		dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num);
544 		return SDW_CMD_IGNORED;
545 	}
546 
547 	if (msg->flags == SDW_MSG_FLAG_READ) {
548 		/* fill response */
549 		for (i = 0; i < count; i++)
550 			msg->buf[i + offset] = FIELD_GET(CDNS_MCP_RESP_RDATA,
551 							 cdns->response_buf[i]);
552 	}
553 
554 	return SDW_CMD_OK;
555 }
556 
557 static enum sdw_command_response
558 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd,
559 	       int offset, int count, bool defer)
560 {
561 	unsigned long time;
562 	u32 base, i, data;
563 	u16 addr;
564 
565 	/* Program the watermark level for RX FIFO */
566 	if (cdns->msg_count != count) {
567 		cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count);
568 		cdns->msg_count = count;
569 	}
570 
571 	base = CDNS_MCP_CMD_BASE;
572 	addr = msg->addr + offset;
573 
574 	for (i = 0; i < count; i++) {
575 		data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
576 		data |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, cmd);
577 		data |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, addr);
578 		addr++;
579 
580 		if (msg->flags == SDW_MSG_FLAG_WRITE)
581 			data |= msg->buf[i + offset];
582 
583 		data |= FIELD_PREP(CDNS_MCP_CMD_SSP_TAG, msg->ssp_sync);
584 		cdns_writel(cdns, base, data);
585 		base += CDNS_MCP_CMD_WORD_LEN;
586 	}
587 
588 	if (defer)
589 		return SDW_CMD_OK;
590 
591 	/* wait for timeout or response */
592 	time = wait_for_completion_timeout(&cdns->tx_complete,
593 					   msecs_to_jiffies(CDNS_TX_TIMEOUT));
594 	if (!time) {
595 		dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n",
596 			cmd, msg->dev_num, msg->addr, msg->len);
597 		msg->len = 0;
598 		return SDW_CMD_TIMEOUT;
599 	}
600 
601 	return cdns_fill_msg_resp(cdns, msg, count, offset);
602 }
603 
604 static enum sdw_command_response
605 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg)
606 {
607 	int nack = 0, no_ack = 0;
608 	unsigned long time;
609 	u32 data[2], base;
610 	int i;
611 
612 	/* Program the watermark level for RX FIFO */
613 	if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) {
614 		cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL);
615 		cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL;
616 	}
617 
618 	data[0] = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
619 	data[0] |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, 0x3);
620 	data[1] = data[0];
621 
622 	data[0] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE1);
623 	data[1] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE2);
624 
625 	data[0] |= msg->addr_page1;
626 	data[1] |= msg->addr_page2;
627 
628 	base = CDNS_MCP_CMD_BASE;
629 	cdns_writel(cdns, base, data[0]);
630 	base += CDNS_MCP_CMD_WORD_LEN;
631 	cdns_writel(cdns, base, data[1]);
632 
633 	time = wait_for_completion_timeout(&cdns->tx_complete,
634 					   msecs_to_jiffies(CDNS_TX_TIMEOUT));
635 	if (!time) {
636 		dev_err(cdns->dev, "SCP Msg trf timed out\n");
637 		msg->len = 0;
638 		return SDW_CMD_TIMEOUT;
639 	}
640 
641 	/* check response the writes */
642 	for (i = 0; i < 2; i++) {
643 		if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
644 			no_ack = 1;
645 			dev_err(cdns->dev, "Program SCP Ack not received\n");
646 			if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
647 				nack = 1;
648 				dev_err(cdns->dev, "Program SCP NACK received\n");
649 			}
650 		}
651 	}
652 
653 	/* For NACK, NO ack, don't return err if we are in Broadcast mode */
654 	if (nack) {
655 		dev_err_ratelimited(cdns->dev,
656 				    "SCP_addrpage NACKed for Slave %d\n", msg->dev_num);
657 		return SDW_CMD_FAIL;
658 	}
659 
660 	if (no_ack) {
661 		dev_dbg_ratelimited(cdns->dev,
662 				    "SCP_addrpage ignored for Slave %d\n", msg->dev_num);
663 		return SDW_CMD_IGNORED;
664 	}
665 
666 	return SDW_CMD_OK;
667 }
668 
669 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd)
670 {
671 	int ret;
672 
673 	if (msg->page) {
674 		ret = cdns_program_scp_addr(cdns, msg);
675 		if (ret) {
676 			msg->len = 0;
677 			return ret;
678 		}
679 	}
680 
681 	switch (msg->flags) {
682 	case SDW_MSG_FLAG_READ:
683 		*cmd = CDNS_MCP_CMD_READ;
684 		break;
685 
686 	case SDW_MSG_FLAG_WRITE:
687 		*cmd = CDNS_MCP_CMD_WRITE;
688 		break;
689 
690 	default:
691 		dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags);
692 		return -EINVAL;
693 	}
694 
695 	return 0;
696 }
697 
698 enum sdw_command_response
699 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg)
700 {
701 	struct sdw_cdns *cdns = bus_to_cdns(bus);
702 	int cmd = 0, ret, i;
703 
704 	ret = cdns_prep_msg(cdns, msg, &cmd);
705 	if (ret)
706 		return SDW_CMD_FAIL_OTHER;
707 
708 	for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) {
709 		ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
710 				     CDNS_MCP_CMD_LEN, false);
711 		if (ret != SDW_CMD_OK)
712 			return ret;
713 	}
714 
715 	if (!(msg->len % CDNS_MCP_CMD_LEN))
716 		return SDW_CMD_OK;
717 
718 	return _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
719 			      msg->len % CDNS_MCP_CMD_LEN, false);
720 }
721 EXPORT_SYMBOL(cdns_xfer_msg);
722 
723 enum sdw_command_response
724 cdns_xfer_msg_defer(struct sdw_bus *bus,
725 		    struct sdw_msg *msg, struct sdw_defer *defer)
726 {
727 	struct sdw_cdns *cdns = bus_to_cdns(bus);
728 	int cmd = 0, ret;
729 
730 	/* for defer only 1 message is supported */
731 	if (msg->len > 1)
732 		return -ENOTSUPP;
733 
734 	ret = cdns_prep_msg(cdns, msg, &cmd);
735 	if (ret)
736 		return SDW_CMD_FAIL_OTHER;
737 
738 	cdns->defer = defer;
739 	cdns->defer->length = msg->len;
740 
741 	return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true);
742 }
743 EXPORT_SYMBOL(cdns_xfer_msg_defer);
744 
745 enum sdw_command_response
746 cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num)
747 {
748 	struct sdw_cdns *cdns = bus_to_cdns(bus);
749 	struct sdw_msg msg;
750 
751 	/* Create dummy message with valid device number */
752 	memset(&msg, 0, sizeof(msg));
753 	msg.dev_num = dev_num;
754 
755 	return cdns_program_scp_addr(cdns, &msg);
756 }
757 EXPORT_SYMBOL(cdns_reset_page_addr);
758 
759 u32 cdns_read_ping_status(struct sdw_bus *bus)
760 {
761 	struct sdw_cdns *cdns = bus_to_cdns(bus);
762 
763 	return cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
764 }
765 EXPORT_SYMBOL(cdns_read_ping_status);
766 
767 /*
768  * IRQ handling
769  */
770 
771 static void cdns_read_response(struct sdw_cdns *cdns)
772 {
773 	u32 num_resp, cmd_base;
774 	int i;
775 
776 	num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT);
777 	num_resp &= CDNS_MCP_RX_FIFO_AVAIL;
778 
779 	cmd_base = CDNS_MCP_CMD_BASE;
780 
781 	for (i = 0; i < num_resp; i++) {
782 		cdns->response_buf[i] = cdns_readl(cdns, cmd_base);
783 		cmd_base += CDNS_MCP_CMD_WORD_LEN;
784 	}
785 }
786 
787 static int cdns_update_slave_status(struct sdw_cdns *cdns,
788 				    u64 slave_intstat)
789 {
790 	enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
791 	bool is_slave = false;
792 	u32 mask;
793 	u32 val;
794 	int i, set_status;
795 
796 	memset(status, 0, sizeof(status));
797 
798 	for (i = 0; i <= SDW_MAX_DEVICES; i++) {
799 		mask = (slave_intstat >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) &
800 			CDNS_MCP_SLAVE_STATUS_BITS;
801 
802 		set_status = 0;
803 
804 		if (mask) {
805 			is_slave = true;
806 
807 			if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) {
808 				status[i] = SDW_SLAVE_RESERVED;
809 				set_status++;
810 			}
811 
812 			if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) {
813 				status[i] = SDW_SLAVE_ATTACHED;
814 				set_status++;
815 			}
816 
817 			if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) {
818 				status[i] = SDW_SLAVE_ALERT;
819 				set_status++;
820 			}
821 
822 			if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) {
823 				status[i] = SDW_SLAVE_UNATTACHED;
824 				set_status++;
825 			}
826 		}
827 
828 		/*
829 		 * check that there was a single reported Slave status and when
830 		 * there is not use the latest status extracted from PING commands
831 		 */
832 		if (set_status != 1) {
833 			val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
834 			val >>= (i * 2);
835 
836 			switch (val & 0x3) {
837 			case 0:
838 				status[i] = SDW_SLAVE_UNATTACHED;
839 				break;
840 			case 1:
841 				status[i] = SDW_SLAVE_ATTACHED;
842 				break;
843 			case 2:
844 				status[i] = SDW_SLAVE_ALERT;
845 				break;
846 			case 3:
847 			default:
848 				status[i] = SDW_SLAVE_RESERVED;
849 				break;
850 			}
851 		}
852 	}
853 
854 	if (is_slave)
855 		return sdw_handle_slave_status(&cdns->bus, status);
856 
857 	return 0;
858 }
859 
860 /**
861  * sdw_cdns_irq() - Cadence interrupt handler
862  * @irq: irq number
863  * @dev_id: irq context
864  */
865 irqreturn_t sdw_cdns_irq(int irq, void *dev_id)
866 {
867 	struct sdw_cdns *cdns = dev_id;
868 	u32 int_status;
869 
870 	/* Check if the link is up */
871 	if (!cdns->link_up)
872 		return IRQ_NONE;
873 
874 	int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT);
875 
876 	/* check for reserved values read as zero */
877 	if (int_status & CDNS_MCP_INT_RESERVED)
878 		return IRQ_NONE;
879 
880 	if (!(int_status & CDNS_MCP_INT_IRQ))
881 		return IRQ_NONE;
882 
883 	if (int_status & CDNS_MCP_INT_RX_WL) {
884 		cdns_read_response(cdns);
885 
886 		if (cdns->defer) {
887 			cdns_fill_msg_resp(cdns, cdns->defer->msg,
888 					   cdns->defer->length, 0);
889 			complete(&cdns->defer->complete);
890 			cdns->defer = NULL;
891 		} else {
892 			complete(&cdns->tx_complete);
893 		}
894 	}
895 
896 	if (int_status & CDNS_MCP_INT_PARITY) {
897 		/* Parity error detected by Master */
898 		dev_err_ratelimited(cdns->dev, "Parity error\n");
899 	}
900 
901 	if (int_status & CDNS_MCP_INT_CTRL_CLASH) {
902 		/* Slave is driving bit slot during control word */
903 		dev_err_ratelimited(cdns->dev, "Bus clash for control word\n");
904 	}
905 
906 	if (int_status & CDNS_MCP_INT_DATA_CLASH) {
907 		/*
908 		 * Multiple slaves trying to drive bit slot, or issue with
909 		 * ownership of data bits or Slave gone bonkers
910 		 */
911 		dev_err_ratelimited(cdns->dev, "Bus clash for data word\n");
912 	}
913 
914 	if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL &&
915 	    int_status & CDNS_MCP_INT_DPINT) {
916 		u32 port_intstat;
917 
918 		/* just log which ports report an error */
919 		port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT);
920 		dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n",
921 				    port_intstat);
922 
923 		/* clear status w/ write1 */
924 		cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat);
925 	}
926 
927 	if (int_status & CDNS_MCP_INT_SLAVE_MASK) {
928 		/* Mask the Slave interrupt and wake thread */
929 		cdns_updatel(cdns, CDNS_MCP_INTMASK,
930 			     CDNS_MCP_INT_SLAVE_MASK, 0);
931 
932 		int_status &= ~CDNS_MCP_INT_SLAVE_MASK;
933 
934 		/*
935 		 * Deal with possible race condition between interrupt
936 		 * handling and disabling interrupts on suspend.
937 		 *
938 		 * If the master is in the process of disabling
939 		 * interrupts, don't schedule a workqueue
940 		 */
941 		if (cdns->interrupt_enabled)
942 			schedule_work(&cdns->work);
943 	}
944 
945 	cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status);
946 	return IRQ_HANDLED;
947 }
948 EXPORT_SYMBOL(sdw_cdns_irq);
949 
950 /**
951  * cdns_update_slave_status_work - update slave status in a work since we will need to handle
952  * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave
953  * process.
954  * @work: cdns worker thread
955  */
956 static void cdns_update_slave_status_work(struct work_struct *work)
957 {
958 	struct sdw_cdns *cdns =
959 		container_of(work, struct sdw_cdns, work);
960 	u32 slave0, slave1;
961 	u64 slave_intstat;
962 	u32 device0_status;
963 	int retry_count = 0;
964 
965 	/*
966 	 * Clear main interrupt first so we don't lose any assertions
967 	 * that happen during this function.
968 	 */
969 	cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK);
970 
971 	slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
972 	slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
973 
974 	/*
975 	 * Clear the bits before handling so we don't lose any
976 	 * bits that re-assert.
977 	 */
978 	cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0);
979 	cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1);
980 
981 	/* combine the two status */
982 	slave_intstat = ((u64)slave1 << 32) | slave0;
983 
984 	dev_dbg_ratelimited(cdns->dev, "Slave status change: 0x%llx\n", slave_intstat);
985 
986 update_status:
987 	cdns_update_slave_status(cdns, slave_intstat);
988 
989 	/*
990 	 * When there is more than one peripheral per link, it's
991 	 * possible that a deviceB becomes attached after we deal with
992 	 * the attachment of deviceA. Since the hardware does a
993 	 * logical AND, the attachment of the second device does not
994 	 * change the status seen by the driver.
995 	 *
996 	 * In that case, clearing the registers above would result in
997 	 * the deviceB never being detected - until a change of status
998 	 * is observed on the bus.
999 	 *
1000 	 * To avoid this race condition, re-check if any device0 needs
1001 	 * attention with PING commands. There is no need to check for
1002 	 * ALERTS since they are not allowed until a non-zero
1003 	 * device_number is assigned.
1004 	 *
1005 	 * Do not clear the INTSTAT0/1. While looping to enumerate devices on
1006 	 * #0 there could be status changes on other devices - these must
1007 	 * be kept in the INTSTAT so they can be handled when all #0 devices
1008 	 * have been handled.
1009 	 */
1010 
1011 	device0_status = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
1012 	device0_status &= 3;
1013 
1014 	if (device0_status == SDW_SLAVE_ATTACHED) {
1015 		if (retry_count++ < SDW_MAX_DEVICES) {
1016 			dev_dbg_ratelimited(cdns->dev,
1017 					    "Device0 detected after clearing status, iteration %d\n",
1018 					    retry_count);
1019 			slave_intstat = CDNS_MCP_SLAVE_INTSTAT_ATTACHED;
1020 			goto update_status;
1021 		} else {
1022 			dev_err_ratelimited(cdns->dev,
1023 					    "Device0 detected after %d iterations\n",
1024 					    retry_count);
1025 		}
1026 	}
1027 
1028 	/* unmask Slave interrupt now */
1029 	cdns_updatel(cdns, CDNS_MCP_INTMASK,
1030 		     CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);
1031 
1032 }
1033 
1034 /* paranoia check to make sure self-cleared bits are indeed cleared */
1035 void sdw_cdns_check_self_clearing_bits(struct sdw_cdns *cdns, const char *string,
1036 				       bool initial_delay, int reset_iterations)
1037 {
1038 	u32 mcp_control;
1039 	u32 mcp_config_update;
1040 	int i;
1041 
1042 	if (initial_delay)
1043 		usleep_range(1000, 1500);
1044 
1045 	mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL);
1046 
1047 	/* the following bits should be cleared immediately */
1048 	if (mcp_control & CDNS_MCP_CONTROL_CMD_RST)
1049 		dev_err(cdns->dev, "%s failed: MCP_CONTROL_CMD_RST is not cleared\n", string);
1050 	if (mcp_control & CDNS_MCP_CONTROL_SOFT_RST)
1051 		dev_err(cdns->dev, "%s failed: MCP_CONTROL_SOFT_RST is not cleared\n", string);
1052 	if (mcp_control & CDNS_MCP_CONTROL_SW_RST)
1053 		dev_err(cdns->dev, "%s failed: MCP_CONTROL_SW_RST is not cleared\n", string);
1054 	if (mcp_control & CDNS_MCP_CONTROL_CLK_STOP_CLR)
1055 		dev_err(cdns->dev, "%s failed: MCP_CONTROL_CLK_STOP_CLR is not cleared\n", string);
1056 	mcp_config_update = cdns_readl(cdns, CDNS_MCP_CONFIG_UPDATE);
1057 	if (mcp_config_update & CDNS_MCP_CONFIG_UPDATE_BIT)
1058 		dev_err(cdns->dev, "%s failed: MCP_CONFIG_UPDATE_BIT is not cleared\n", string);
1059 
1060 	i = 0;
1061 	while (mcp_control & CDNS_MCP_CONTROL_HW_RST) {
1062 		if (i == reset_iterations) {
1063 			dev_err(cdns->dev, "%s failed: MCP_CONTROL_HW_RST is not cleared\n", string);
1064 			break;
1065 		}
1066 
1067 		dev_dbg(cdns->dev, "%s: MCP_CONTROL_HW_RST is not cleared at iteration %d\n", string, i);
1068 		i++;
1069 
1070 		usleep_range(1000, 1500);
1071 		mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL);
1072 	}
1073 
1074 }
1075 EXPORT_SYMBOL(sdw_cdns_check_self_clearing_bits);
1076 
1077 /*
1078  * init routines
1079  */
1080 
1081 /**
1082  * sdw_cdns_exit_reset() - Program reset parameters and start bus operations
1083  * @cdns: Cadence instance
1084  */
1085 int sdw_cdns_exit_reset(struct sdw_cdns *cdns)
1086 {
1087 	/* keep reset delay unchanged to 4096 cycles */
1088 
1089 	/* use hardware generated reset */
1090 	cdns_updatel(cdns, CDNS_MCP_CONTROL,
1091 		     CDNS_MCP_CONTROL_HW_RST,
1092 		     CDNS_MCP_CONTROL_HW_RST);
1093 
1094 	/* commit changes */
1095 	cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
1096 		     CDNS_MCP_CONFIG_UPDATE_BIT,
1097 		     CDNS_MCP_CONFIG_UPDATE_BIT);
1098 
1099 	/* don't wait here */
1100 	return 0;
1101 
1102 }
1103 EXPORT_SYMBOL(sdw_cdns_exit_reset);
1104 
1105 /**
1106  * cdns_enable_slave_interrupts() - Enable SDW slave interrupts
1107  * @cdns: Cadence instance
1108  * @state: boolean for true/false
1109  */
1110 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state)
1111 {
1112 	u32 mask;
1113 
1114 	mask = cdns_readl(cdns, CDNS_MCP_INTMASK);
1115 	if (state)
1116 		mask |= CDNS_MCP_INT_SLAVE_MASK;
1117 	else
1118 		mask &= ~CDNS_MCP_INT_SLAVE_MASK;
1119 
1120 	cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
1121 }
1122 
1123 /**
1124  * sdw_cdns_enable_interrupt() - Enable SDW interrupts
1125  * @cdns: Cadence instance
1126  * @state: True if we are trying to enable interrupt.
1127  */
1128 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)
1129 {
1130 	u32 slave_intmask0 = 0;
1131 	u32 slave_intmask1 = 0;
1132 	u32 mask = 0;
1133 
1134 	if (!state)
1135 		goto update_masks;
1136 
1137 	slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK;
1138 	slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK;
1139 
1140 	/* enable detection of all slave state changes */
1141 	mask = CDNS_MCP_INT_SLAVE_MASK;
1142 
1143 	/* enable detection of bus issues */
1144 	mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
1145 		CDNS_MCP_INT_PARITY;
1146 
1147 	/* port interrupt limited to test modes for now */
1148 	if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1149 		mask |= CDNS_MCP_INT_DPINT;
1150 
1151 	/* enable detection of RX fifo level */
1152 	mask |= CDNS_MCP_INT_RX_WL;
1153 
1154 	/*
1155 	 * CDNS_MCP_INT_IRQ needs to be set otherwise all previous
1156 	 * settings are irrelevant
1157 	 */
1158 	mask |= CDNS_MCP_INT_IRQ;
1159 
1160 	if (interrupt_mask) /* parameter override */
1161 		mask = interrupt_mask;
1162 
1163 update_masks:
1164 	/* clear slave interrupt status before enabling interrupt */
1165 	if (state) {
1166 		u32 slave_state;
1167 
1168 		slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
1169 		cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state);
1170 		slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
1171 		cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state);
1172 	}
1173 	cdns->interrupt_enabled = state;
1174 
1175 	/*
1176 	 * Complete any on-going status updates before updating masks,
1177 	 * and cancel queued status updates.
1178 	 *
1179 	 * There could be a race with a new interrupt thrown before
1180 	 * the 3 mask updates below are complete, so in the interrupt
1181 	 * we use the 'interrupt_enabled' status to prevent new work
1182 	 * from being queued.
1183 	 */
1184 	if (!state)
1185 		cancel_work_sync(&cdns->work);
1186 
1187 	cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0);
1188 	cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1);
1189 	cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
1190 
1191 	return 0;
1192 }
1193 EXPORT_SYMBOL(sdw_cdns_enable_interrupt);
1194 
1195 static int cdns_allocate_pdi(struct sdw_cdns *cdns,
1196 			     struct sdw_cdns_pdi **stream,
1197 			     u32 num, u32 pdi_offset)
1198 {
1199 	struct sdw_cdns_pdi *pdi;
1200 	int i;
1201 
1202 	if (!num)
1203 		return 0;
1204 
1205 	pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL);
1206 	if (!pdi)
1207 		return -ENOMEM;
1208 
1209 	for (i = 0; i < num; i++) {
1210 		pdi[i].num = i + pdi_offset;
1211 	}
1212 
1213 	*stream = pdi;
1214 	return 0;
1215 }
1216 
1217 /**
1218  * sdw_cdns_pdi_init() - PDI initialization routine
1219  *
1220  * @cdns: Cadence instance
1221  * @config: Stream configurations
1222  */
1223 int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
1224 		      struct sdw_cdns_stream_config config)
1225 {
1226 	struct sdw_cdns_streams *stream;
1227 	int offset;
1228 	int ret;
1229 
1230 	cdns->pcm.num_bd = config.pcm_bd;
1231 	cdns->pcm.num_in = config.pcm_in;
1232 	cdns->pcm.num_out = config.pcm_out;
1233 
1234 	/* Allocate PDIs for PCMs */
1235 	stream = &cdns->pcm;
1236 
1237 	/* we allocate PDI0 and PDI1 which are used for Bulk */
1238 	offset = 0;
1239 
1240 	ret = cdns_allocate_pdi(cdns, &stream->bd,
1241 				stream->num_bd, offset);
1242 	if (ret)
1243 		return ret;
1244 
1245 	offset += stream->num_bd;
1246 
1247 	ret = cdns_allocate_pdi(cdns, &stream->in,
1248 				stream->num_in, offset);
1249 	if (ret)
1250 		return ret;
1251 
1252 	offset += stream->num_in;
1253 
1254 	ret = cdns_allocate_pdi(cdns, &stream->out,
1255 				stream->num_out, offset);
1256 	if (ret)
1257 		return ret;
1258 
1259 	/* Update total number of PCM PDIs */
1260 	stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1261 	cdns->num_ports = stream->num_pdi;
1262 
1263 	return 0;
1264 }
1265 EXPORT_SYMBOL(sdw_cdns_pdi_init);
1266 
1267 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
1268 {
1269 	u32 val;
1270 	int c;
1271 	int r;
1272 
1273 	r = sdw_find_row_index(n_rows);
1274 	c = sdw_find_col_index(n_cols);
1275 
1276 	val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r);
1277 	val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c);
1278 
1279 	return val;
1280 }
1281 
1282 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
1283 {
1284 	struct sdw_bus *bus = &cdns->bus;
1285 	struct sdw_master_prop *prop = &bus->prop;
1286 	u32 val;
1287 	u32 ssp_interval;
1288 	int divider;
1289 
1290 	/* Set clock divider */
1291 	divider	= (prop->mclk_freq / prop->max_clk_freq) - 1;
1292 
1293 	cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0,
1294 		     CDNS_MCP_CLK_MCLKD_MASK, divider);
1295 	cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1,
1296 		     CDNS_MCP_CLK_MCLKD_MASK, divider);
1297 
1298 	/*
1299 	 * Frame shape changes after initialization have to be done
1300 	 * with the bank switch mechanism
1301 	 */
1302 	val = cdns_set_initial_frame_shape(prop->default_row,
1303 					   prop->default_col);
1304 	cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val);
1305 
1306 	/* Set SSP interval to default value */
1307 	ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ;
1308 	cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval);
1309 	cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval);
1310 }
1311 
1312 /**
1313  * sdw_cdns_init() - Cadence initialization
1314  * @cdns: Cadence instance
1315  */
1316 int sdw_cdns_init(struct sdw_cdns *cdns)
1317 {
1318 	u32 val;
1319 
1320 	cdns_init_clock_ctrl(cdns);
1321 
1322 	sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);
1323 
1324 	/* reset msg_count to default value of FIFOLEVEL */
1325 	cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL);
1326 
1327 	/* flush command FIFOs */
1328 	cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST,
1329 		     CDNS_MCP_CONTROL_CMD_RST);
1330 
1331 	/* Set cmd accept mode */
1332 	cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
1333 		     CDNS_MCP_CONTROL_CMD_ACCEPT);
1334 
1335 	/* Configure mcp config */
1336 	val = cdns_readl(cdns, CDNS_MCP_CONFIG);
1337 
1338 	/* enable bus operations with clock and data */
1339 	val &= ~CDNS_MCP_CONFIG_OP;
1340 	val |= CDNS_MCP_CONFIG_OP_NORMAL;
1341 
1342 	/* Set cmd mode for Tx and Rx cmds */
1343 	val &= ~CDNS_MCP_CONFIG_CMD;
1344 
1345 	/* Disable sniffer mode */
1346 	val &= ~CDNS_MCP_CONFIG_SNIFFER;
1347 
1348 	/* Disable auto bus release */
1349 	val &= ~CDNS_MCP_CONFIG_BUS_REL;
1350 
1351 	if (cdns->bus.multi_link)
1352 		/* Set Multi-master mode to take gsync into account */
1353 		val |= CDNS_MCP_CONFIG_MMASTER;
1354 
1355 	/* leave frame delay to hardware default of 0x1F */
1356 
1357 	/* leave command retry to hardware default of 0 */
1358 
1359 	cdns_writel(cdns, CDNS_MCP_CONFIG, val);
1360 
1361 	/* changes will be committed later */
1362 	return 0;
1363 }
1364 EXPORT_SYMBOL(sdw_cdns_init);
1365 
1366 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params)
1367 {
1368 	struct sdw_master_prop *prop = &bus->prop;
1369 	struct sdw_cdns *cdns = bus_to_cdns(bus);
1370 	int mcp_clkctrl_off;
1371 	int divider;
1372 
1373 	if (!params->curr_dr_freq) {
1374 		dev_err(cdns->dev, "NULL curr_dr_freq\n");
1375 		return -EINVAL;
1376 	}
1377 
1378 	divider	= prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR /
1379 		params->curr_dr_freq;
1380 	divider--; /* divider is 1/(N+1) */
1381 
1382 	if (params->next_bank)
1383 		mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1;
1384 	else
1385 		mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0;
1386 
1387 	cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider);
1388 
1389 	return 0;
1390 }
1391 EXPORT_SYMBOL(cdns_bus_conf);
1392 
1393 static int cdns_port_params(struct sdw_bus *bus,
1394 			    struct sdw_port_params *p_params, unsigned int bank)
1395 {
1396 	struct sdw_cdns *cdns = bus_to_cdns(bus);
1397 	int dpn_config_off_source;
1398 	int dpn_config_off_target;
1399 	int target_num = p_params->num;
1400 	int source_num = p_params->num;
1401 	bool override = false;
1402 	int dpn_config;
1403 
1404 	if (target_num == cdns->pdi_loopback_target &&
1405 	    cdns->pdi_loopback_source != -1) {
1406 		source_num = cdns->pdi_loopback_source;
1407 		override = true;
1408 	}
1409 
1410 	if (bank) {
1411 		dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num);
1412 		dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num);
1413 	} else {
1414 		dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num);
1415 		dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num);
1416 	}
1417 
1418 	dpn_config = cdns_readl(cdns, dpn_config_off_source);
1419 
1420 	/* use port params if there is no loopback, otherwise use source as is */
1421 	if (!override) {
1422 		u32p_replace_bits(&dpn_config, p_params->bps - 1, CDNS_DPN_CONFIG_WL);
1423 		u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW);
1424 		u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT);
1425 	}
1426 
1427 	cdns_writel(cdns, dpn_config_off_target, dpn_config);
1428 
1429 	return 0;
1430 }
1431 
1432 static int cdns_transport_params(struct sdw_bus *bus,
1433 				 struct sdw_transport_params *t_params,
1434 				 enum sdw_reg_bank bank)
1435 {
1436 	struct sdw_cdns *cdns = bus_to_cdns(bus);
1437 	int dpn_config;
1438 	int dpn_config_off_source;
1439 	int dpn_config_off_target;
1440 	int dpn_hctrl;
1441 	int dpn_hctrl_off_source;
1442 	int dpn_hctrl_off_target;
1443 	int dpn_offsetctrl;
1444 	int dpn_offsetctrl_off_source;
1445 	int dpn_offsetctrl_off_target;
1446 	int dpn_samplectrl;
1447 	int dpn_samplectrl_off_source;
1448 	int dpn_samplectrl_off_target;
1449 	int source_num = t_params->port_num;
1450 	int target_num = t_params->port_num;
1451 	bool override = false;
1452 
1453 	if (target_num == cdns->pdi_loopback_target &&
1454 	    cdns->pdi_loopback_source != -1) {
1455 		source_num = cdns->pdi_loopback_source;
1456 		override = true;
1457 	}
1458 
1459 	/*
1460 	 * Note: Only full data port is supported on the Master side for
1461 	 * both PCM and PDM ports.
1462 	 */
1463 
1464 	if (bank) {
1465 		dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num);
1466 		dpn_hctrl_off_source = CDNS_DPN_B1_HCTRL(source_num);
1467 		dpn_offsetctrl_off_source = CDNS_DPN_B1_OFFSET_CTRL(source_num);
1468 		dpn_samplectrl_off_source = CDNS_DPN_B1_SAMPLE_CTRL(source_num);
1469 
1470 		dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num);
1471 		dpn_hctrl_off_target = CDNS_DPN_B1_HCTRL(target_num);
1472 		dpn_offsetctrl_off_target = CDNS_DPN_B1_OFFSET_CTRL(target_num);
1473 		dpn_samplectrl_off_target = CDNS_DPN_B1_SAMPLE_CTRL(target_num);
1474 
1475 	} else {
1476 		dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num);
1477 		dpn_hctrl_off_source = CDNS_DPN_B0_HCTRL(source_num);
1478 		dpn_offsetctrl_off_source = CDNS_DPN_B0_OFFSET_CTRL(source_num);
1479 		dpn_samplectrl_off_source = CDNS_DPN_B0_SAMPLE_CTRL(source_num);
1480 
1481 		dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num);
1482 		dpn_hctrl_off_target = CDNS_DPN_B0_HCTRL(target_num);
1483 		dpn_offsetctrl_off_target = CDNS_DPN_B0_OFFSET_CTRL(target_num);
1484 		dpn_samplectrl_off_target = CDNS_DPN_B0_SAMPLE_CTRL(target_num);
1485 	}
1486 
1487 	dpn_config = cdns_readl(cdns, dpn_config_off_source);
1488 	if (!override) {
1489 		u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC);
1490 		u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM);
1491 	}
1492 	cdns_writel(cdns, dpn_config_off_target, dpn_config);
1493 
1494 	if (!override) {
1495 		dpn_offsetctrl = 0;
1496 		u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1);
1497 		u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2);
1498 	} else {
1499 		dpn_offsetctrl = cdns_readl(cdns, dpn_offsetctrl_off_source);
1500 	}
1501 	cdns_writel(cdns, dpn_offsetctrl_off_target,  dpn_offsetctrl);
1502 
1503 	if (!override) {
1504 		dpn_hctrl = 0;
1505 		u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART);
1506 		u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP);
1507 		u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL);
1508 	} else {
1509 		dpn_hctrl = cdns_readl(cdns, dpn_hctrl_off_source);
1510 	}
1511 	cdns_writel(cdns, dpn_hctrl_off_target, dpn_hctrl);
1512 
1513 	if (!override)
1514 		dpn_samplectrl = t_params->sample_interval - 1;
1515 	else
1516 		dpn_samplectrl = cdns_readl(cdns, dpn_samplectrl_off_source);
1517 	cdns_writel(cdns, dpn_samplectrl_off_target, dpn_samplectrl);
1518 
1519 	return 0;
1520 }
1521 
1522 static int cdns_port_enable(struct sdw_bus *bus,
1523 			    struct sdw_enable_ch *enable_ch, unsigned int bank)
1524 {
1525 	struct sdw_cdns *cdns = bus_to_cdns(bus);
1526 	int dpn_chnen_off, ch_mask;
1527 
1528 	if (bank)
1529 		dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num);
1530 	else
1531 		dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num);
1532 
1533 	ch_mask = enable_ch->ch_mask * enable_ch->enable;
1534 	cdns_writel(cdns, dpn_chnen_off, ch_mask);
1535 
1536 	return 0;
1537 }
1538 
1539 static const struct sdw_master_port_ops cdns_port_ops = {
1540 	.dpn_set_port_params = cdns_port_params,
1541 	.dpn_set_port_transport_params = cdns_transport_params,
1542 	.dpn_port_enable_ch = cdns_port_enable,
1543 };
1544 
1545 /**
1546  * sdw_cdns_is_clock_stop: Check clock status
1547  *
1548  * @cdns: Cadence instance
1549  */
1550 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns)
1551 {
1552 	return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP);
1553 }
1554 EXPORT_SYMBOL(sdw_cdns_is_clock_stop);
1555 
1556 /**
1557  * sdw_cdns_clock_stop: Cadence clock stop configuration routine
1558  *
1559  * @cdns: Cadence instance
1560  * @block_wake: prevent wakes if required by the platform
1561  */
1562 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake)
1563 {
1564 	bool slave_present = false;
1565 	struct sdw_slave *slave;
1566 	int ret;
1567 
1568 	sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);
1569 
1570 	/* Check suspend status */
1571 	if (sdw_cdns_is_clock_stop(cdns)) {
1572 		dev_dbg(cdns->dev, "Clock is already stopped\n");
1573 		return 0;
1574 	}
1575 
1576 	/*
1577 	 * Before entering clock stop we mask the Slave
1578 	 * interrupts. This helps avoid having to deal with e.g. a
1579 	 * Slave becoming UNATTACHED while the clock is being stopped
1580 	 */
1581 	cdns_enable_slave_interrupts(cdns, false);
1582 
1583 	/*
1584 	 * For specific platforms, it is required to be able to put
1585 	 * master into a state in which it ignores wake-up trials
1586 	 * in clock stop state
1587 	 */
1588 	if (block_wake)
1589 		cdns_updatel(cdns, CDNS_MCP_CONTROL,
1590 			     CDNS_MCP_CONTROL_BLOCK_WAKEUP,
1591 			     CDNS_MCP_CONTROL_BLOCK_WAKEUP);
1592 
1593 	list_for_each_entry(slave, &cdns->bus.slaves, node) {
1594 		if (slave->status == SDW_SLAVE_ATTACHED ||
1595 		    slave->status == SDW_SLAVE_ALERT) {
1596 			slave_present = true;
1597 			break;
1598 		}
1599 	}
1600 
1601 	/* commit changes */
1602 	ret = cdns_config_update(cdns);
1603 	if (ret < 0) {
1604 		dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1605 		return ret;
1606 	}
1607 
1608 	/* Prepare slaves for clock stop */
1609 	if (slave_present) {
1610 		ret = sdw_bus_prep_clk_stop(&cdns->bus);
1611 		if (ret < 0 && ret != -ENODATA) {
1612 			dev_err(cdns->dev, "prepare clock stop failed %d\n", ret);
1613 			return ret;
1614 		}
1615 	}
1616 
1617 	/*
1618 	 * Enter clock stop mode and only report errors if there are
1619 	 * Slave devices present (ALERT or ATTACHED)
1620 	 */
1621 	ret = sdw_bus_clk_stop(&cdns->bus);
1622 	if (ret < 0 && slave_present && ret != -ENODATA) {
1623 		dev_err(cdns->dev, "bus clock stop failed %d\n", ret);
1624 		return ret;
1625 	}
1626 
1627 	ret = cdns_set_wait(cdns, CDNS_MCP_STAT,
1628 			    CDNS_MCP_STAT_CLK_STOP,
1629 			    CDNS_MCP_STAT_CLK_STOP);
1630 	if (ret < 0)
1631 		dev_err(cdns->dev, "Clock stop failed %d\n", ret);
1632 
1633 	return ret;
1634 }
1635 EXPORT_SYMBOL(sdw_cdns_clock_stop);
1636 
1637 /**
1638  * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine
1639  *
1640  * @cdns: Cadence instance
1641  * @bus_reset: context may be lost while in low power modes and the bus
1642  * may require a Severe Reset and re-enumeration after a wake.
1643  */
1644 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset)
1645 {
1646 	int ret;
1647 
1648 	/* unmask Slave interrupts that were masked when stopping the clock */
1649 	cdns_enable_slave_interrupts(cdns, true);
1650 
1651 	ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,
1652 			     CDNS_MCP_CONTROL_CLK_STOP_CLR);
1653 	if (ret < 0) {
1654 		dev_err(cdns->dev, "Couldn't exit from clock stop\n");
1655 		return ret;
1656 	}
1657 
1658 	ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0);
1659 	if (ret < 0) {
1660 		dev_err(cdns->dev, "clock stop exit failed %d\n", ret);
1661 		return ret;
1662 	}
1663 
1664 	cdns_updatel(cdns, CDNS_MCP_CONTROL,
1665 		     CDNS_MCP_CONTROL_BLOCK_WAKEUP, 0);
1666 
1667 	cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
1668 		     CDNS_MCP_CONTROL_CMD_ACCEPT);
1669 
1670 	if (!bus_reset) {
1671 
1672 		/* enable bus operations with clock and data */
1673 		cdns_updatel(cdns, CDNS_MCP_CONFIG,
1674 			     CDNS_MCP_CONFIG_OP,
1675 			     CDNS_MCP_CONFIG_OP_NORMAL);
1676 
1677 		ret = cdns_config_update(cdns);
1678 		if (ret < 0) {
1679 			dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1680 			return ret;
1681 		}
1682 
1683 		ret = sdw_bus_exit_clk_stop(&cdns->bus);
1684 		if (ret < 0)
1685 			dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret);
1686 	}
1687 
1688 	return ret;
1689 }
1690 EXPORT_SYMBOL(sdw_cdns_clock_restart);
1691 
1692 /**
1693  * sdw_cdns_probe() - Cadence probe routine
1694  * @cdns: Cadence instance
1695  */
1696 int sdw_cdns_probe(struct sdw_cdns *cdns)
1697 {
1698 	init_completion(&cdns->tx_complete);
1699 	cdns->bus.port_ops = &cdns_port_ops;
1700 
1701 	INIT_WORK(&cdns->work, cdns_update_slave_status_work);
1702 	return 0;
1703 }
1704 EXPORT_SYMBOL(sdw_cdns_probe);
1705 
1706 int cdns_set_sdw_stream(struct snd_soc_dai *dai,
1707 			void *stream, int direction)
1708 {
1709 	struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
1710 	struct sdw_cdns_dma_data *dma;
1711 
1712 	if (stream) {
1713 		/* first paranoia check */
1714 		if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1715 			dma = dai->playback_dma_data;
1716 		else
1717 			dma = dai->capture_dma_data;
1718 
1719 		if (dma) {
1720 			dev_err(dai->dev,
1721 				"dma_data already allocated for dai %s\n",
1722 				dai->name);
1723 			return -EINVAL;
1724 		}
1725 
1726 		/* allocate and set dma info */
1727 		dma = kzalloc(sizeof(*dma), GFP_KERNEL);
1728 		if (!dma)
1729 			return -ENOMEM;
1730 
1731 		dma->stream_type = SDW_STREAM_PCM;
1732 
1733 		dma->bus = &cdns->bus;
1734 		dma->link_id = cdns->instance;
1735 
1736 		dma->stream = stream;
1737 
1738 		if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1739 			dai->playback_dma_data = dma;
1740 		else
1741 			dai->capture_dma_data = dma;
1742 	} else {
1743 		/* for NULL stream we release allocated dma_data */
1744 		if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
1745 			kfree(dai->playback_dma_data);
1746 			dai->playback_dma_data = NULL;
1747 		} else {
1748 			kfree(dai->capture_dma_data);
1749 			dai->capture_dma_data = NULL;
1750 		}
1751 	}
1752 	return 0;
1753 }
1754 EXPORT_SYMBOL(cdns_set_sdw_stream);
1755 
1756 /**
1757  * cdns_find_pdi() - Find a free PDI
1758  *
1759  * @cdns: Cadence instance
1760  * @offset: Starting offset
1761  * @num: Number of PDIs
1762  * @pdi: PDI instances
1763  * @dai_id: DAI id
1764  *
1765  * Find a PDI for a given PDI array. The PDI num and dai_id are
1766  * expected to match, return NULL otherwise.
1767  */
1768 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns,
1769 					  unsigned int offset,
1770 					  unsigned int num,
1771 					  struct sdw_cdns_pdi *pdi,
1772 					  int dai_id)
1773 {
1774 	int i;
1775 
1776 	for (i = offset; i < offset + num; i++)
1777 		if (pdi[i].num == dai_id)
1778 			return &pdi[i];
1779 
1780 	return NULL;
1781 }
1782 
1783 /**
1784  * sdw_cdns_config_stream: Configure a stream
1785  *
1786  * @cdns: Cadence instance
1787  * @ch: Channel count
1788  * @dir: Data direction
1789  * @pdi: PDI to be used
1790  */
1791 void sdw_cdns_config_stream(struct sdw_cdns *cdns,
1792 			    u32 ch, u32 dir, struct sdw_cdns_pdi *pdi)
1793 {
1794 	u32 offset, val = 0;
1795 
1796 	if (dir == SDW_DATA_DIR_RX) {
1797 		val = CDNS_PORTCTRL_DIRN;
1798 
1799 		if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1800 			val |= CDNS_PORTCTRL_TEST_FAILED;
1801 	}
1802 	offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET;
1803 	cdns_updatel(cdns, offset,
1804 		     CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED,
1805 		     val);
1806 
1807 	val = pdi->num;
1808 	val |= CDNS_PDI_CONFIG_SOFT_RESET;
1809 	val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1);
1810 	cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val);
1811 }
1812 EXPORT_SYMBOL(sdw_cdns_config_stream);
1813 
1814 /**
1815  * sdw_cdns_alloc_pdi() - Allocate a PDI
1816  *
1817  * @cdns: Cadence instance
1818  * @stream: Stream to be allocated
1819  * @ch: Channel count
1820  * @dir: Data direction
1821  * @dai_id: DAI id
1822  */
1823 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns,
1824 					struct sdw_cdns_streams *stream,
1825 					u32 ch, u32 dir, int dai_id)
1826 {
1827 	struct sdw_cdns_pdi *pdi = NULL;
1828 
1829 	if (dir == SDW_DATA_DIR_RX)
1830 		pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in,
1831 				    dai_id);
1832 	else
1833 		pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out,
1834 				    dai_id);
1835 
1836 	/* check if we found a PDI, else find in bi-directional */
1837 	if (!pdi)
1838 		pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd,
1839 				    dai_id);
1840 
1841 	if (pdi) {
1842 		pdi->l_ch_num = 0;
1843 		pdi->h_ch_num = ch - 1;
1844 		pdi->dir = dir;
1845 		pdi->ch_count = ch;
1846 	}
1847 
1848 	return pdi;
1849 }
1850 EXPORT_SYMBOL(sdw_cdns_alloc_pdi);
1851 
1852 MODULE_LICENSE("Dual BSD/GPL");
1853 MODULE_DESCRIPTION("Cadence Soundwire Library");
1854