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