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/cleanup.h>
10 #include <linux/delay.h>
11 #include <linux/device.h>
12 #include <linux/debugfs.h>
13 #include <linux/interrupt.h>
14 #include <linux/io.h>
15 #include <linux/module.h>
16 #include <linux/mod_devicetable.h>
17 #include <linux/pm_runtime.h>
18 #include <linux/soundwire/sdw_registers.h>
19 #include <linux/soundwire/sdw.h>
20 #include <sound/pcm_params.h>
21 #include <sound/soc.h>
22 #include <linux/workqueue.h>
23 #include "bus.h"
24 #include "cadence_master.h"
25
26 static int interrupt_mask;
27 module_param_named(cnds_mcp_int_mask, interrupt_mask, int, 0444);
28 MODULE_PARM_DESC(cdns_mcp_int_mask, "Cadence MCP IntMask");
29
30 #define CDNS_MCP_CONFIG 0x0
31 #define CDNS_MCP_CONFIG_BUS_REL BIT(6)
32
33 #define CDNS_IP_MCP_CONFIG 0x0 /* IP offset added at run-time */
34
35 #define CDNS_IP_MCP_CONFIG_MCMD_RETRY GENMASK(27, 24)
36 #define CDNS_IP_MCP_CONFIG_MPREQ_DELAY GENMASK(20, 16)
37 #define CDNS_IP_MCP_CONFIG_MMASTER BIT(7)
38 #define CDNS_IP_MCP_CONFIG_SNIFFER BIT(5)
39 #define CDNS_IP_MCP_CONFIG_CMD BIT(3)
40 #define CDNS_IP_MCP_CONFIG_OP GENMASK(2, 0)
41 #define CDNS_IP_MCP_CONFIG_OP_NORMAL 0
42
43 #define CDNS_MCP_CONTROL 0x4
44
45 #define CDNS_MCP_CONTROL_CMD_RST BIT(7)
46 #define CDNS_MCP_CONTROL_SOFT_RST BIT(6)
47 #define CDNS_MCP_CONTROL_HW_RST BIT(4)
48 #define CDNS_MCP_CONTROL_CLK_STOP_CLR BIT(2)
49
50 #define CDNS_IP_MCP_CONTROL 0x4 /* IP offset added at run-time */
51
52 #define CDNS_IP_MCP_CONTROL_RST_DELAY GENMASK(10, 8)
53 #define CDNS_IP_MCP_CONTROL_SW_RST BIT(5)
54 #define CDNS_IP_MCP_CONTROL_CLK_PAUSE BIT(3)
55 #define CDNS_IP_MCP_CONTROL_CMD_ACCEPT BIT(1)
56 #define CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP BIT(0)
57
58 #define CDNS_IP_MCP_CMDCTRL 0x8 /* IP offset added at run-time */
59
60 #define CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR BIT(2)
61
62 #define CDNS_MCP_SSPSTAT 0xC
63 #define CDNS_MCP_FRAME_SHAPE 0x10
64 #define CDNS_MCP_FRAME_SHAPE_INIT 0x14
65 #define CDNS_MCP_FRAME_SHAPE_COL_MASK GENMASK(2, 0)
66 #define CDNS_MCP_FRAME_SHAPE_ROW_MASK GENMASK(7, 3)
67
68 #define CDNS_MCP_CONFIG_UPDATE 0x18
69 #define CDNS_MCP_CONFIG_UPDATE_BIT BIT(0)
70
71 #define CDNS_MCP_PHYCTRL 0x1C
72 #define CDNS_MCP_SSP_CTRL0 0x20
73 #define CDNS_MCP_SSP_CTRL1 0x28
74 #define CDNS_MCP_CLK_CTRL0 0x30
75 #define CDNS_MCP_CLK_CTRL1 0x38
76 #define CDNS_MCP_CLK_MCLKD_MASK GENMASK(7, 0)
77
78 #define CDNS_MCP_STAT 0x40
79
80 #define CDNS_MCP_STAT_ACTIVE_BANK BIT(20)
81 #define CDNS_MCP_STAT_CLK_STOP BIT(16)
82
83 #define CDNS_MCP_INTSTAT 0x44
84 #define CDNS_MCP_INTMASK 0x48
85
86 #define CDNS_MCP_INT_IRQ BIT(31)
87 #define CDNS_MCP_INT_RESERVED1 GENMASK(30, 17)
88 #define CDNS_MCP_INT_WAKEUP BIT(16)
89 #define CDNS_MCP_INT_SLAVE_RSVD BIT(15)
90 #define CDNS_MCP_INT_SLAVE_ALERT BIT(14)
91 #define CDNS_MCP_INT_SLAVE_ATTACH BIT(13)
92 #define CDNS_MCP_INT_SLAVE_NATTACH BIT(12)
93 #define CDNS_MCP_INT_SLAVE_MASK GENMASK(15, 12)
94 #define CDNS_MCP_INT_DPINT BIT(11)
95 #define CDNS_MCP_INT_CTRL_CLASH BIT(10)
96 #define CDNS_MCP_INT_DATA_CLASH BIT(9)
97 #define CDNS_MCP_INT_PARITY BIT(8)
98 #define CDNS_MCP_INT_CMD_ERR BIT(7)
99 #define CDNS_MCP_INT_RESERVED2 GENMASK(6, 4)
100 #define CDNS_MCP_INT_RX_NE BIT(3)
101 #define CDNS_MCP_INT_RX_WL BIT(2)
102 #define CDNS_MCP_INT_TXE BIT(1)
103 #define CDNS_MCP_INT_TXF BIT(0)
104 #define CDNS_MCP_INT_RESERVED (CDNS_MCP_INT_RESERVED1 | CDNS_MCP_INT_RESERVED2)
105
106 #define CDNS_MCP_INTSET 0x4C
107
108 #define CDNS_MCP_SLAVE_STAT 0x50
109 #define CDNS_MCP_SLAVE_STAT_MASK GENMASK(1, 0)
110
111 #define CDNS_MCP_SLAVE_INTSTAT0 0x54
112 #define CDNS_MCP_SLAVE_INTSTAT1 0x58
113 #define CDNS_MCP_SLAVE_INTSTAT_NPRESENT BIT(0)
114 #define CDNS_MCP_SLAVE_INTSTAT_ATTACHED BIT(1)
115 #define CDNS_MCP_SLAVE_INTSTAT_ALERT BIT(2)
116 #define CDNS_MCP_SLAVE_INTSTAT_RESERVED BIT(3)
117 #define CDNS_MCP_SLAVE_STATUS_BITS GENMASK(3, 0)
118 #define CDNS_MCP_SLAVE_STATUS_NUM 4
119
120 #define CDNS_MCP_SLAVE_INTMASK0 0x5C
121 #define CDNS_MCP_SLAVE_INTMASK1 0x60
122
123 #define CDNS_MCP_SLAVE_INTMASK0_MASK GENMASK(31, 0)
124 #define CDNS_MCP_SLAVE_INTMASK1_MASK GENMASK(15, 0)
125
126 #define CDNS_MCP_PORT_INTSTAT 0x64
127 #define CDNS_MCP_PDI_STAT 0x6C
128
129 #define CDNS_MCP_FIFOLEVEL 0x78
130 #define CDNS_MCP_FIFOSTAT 0x7C
131 #define CDNS_MCP_RX_FIFO_AVAIL GENMASK(5, 0)
132
133 #define CDNS_IP_MCP_CMD_BASE 0x80 /* IP offset added at run-time */
134 #define CDNS_IP_MCP_RESP_BASE 0x80 /* IP offset added at run-time */
135 /* FIFO can hold 8 commands */
136 #define CDNS_MCP_CMD_LEN 8
137 #define CDNS_MCP_CMD_WORD_LEN 0x4
138
139 #define CDNS_MCP_CMD_SSP_TAG BIT(31)
140 #define CDNS_MCP_CMD_COMMAND GENMASK(30, 28)
141 #define CDNS_MCP_CMD_DEV_ADDR GENMASK(27, 24)
142 #define CDNS_MCP_CMD_REG_ADDR GENMASK(23, 8)
143 #define CDNS_MCP_CMD_REG_DATA GENMASK(7, 0)
144
145 #define CDNS_MCP_CMD_READ 2
146 #define CDNS_MCP_CMD_WRITE 3
147
148 #define CDNS_MCP_RESP_RDATA GENMASK(15, 8)
149 #define CDNS_MCP_RESP_ACK BIT(0)
150 #define CDNS_MCP_RESP_NACK BIT(1)
151
152 #define CDNS_DP_SIZE 128
153
154 #define CDNS_DPN_B0_CONFIG(n) (0x100 + CDNS_DP_SIZE * (n))
155 #define CDNS_DPN_B0_CH_EN(n) (0x104 + CDNS_DP_SIZE * (n))
156 #define CDNS_DPN_B0_SAMPLE_CTRL(n) (0x108 + CDNS_DP_SIZE * (n))
157 #define CDNS_DPN_B0_OFFSET_CTRL(n) (0x10C + CDNS_DP_SIZE * (n))
158 #define CDNS_DPN_B0_HCTRL(n) (0x110 + CDNS_DP_SIZE * (n))
159 #define CDNS_DPN_B0_ASYNC_CTRL(n) (0x114 + CDNS_DP_SIZE * (n))
160
161 #define CDNS_DPN_B1_CONFIG(n) (0x118 + CDNS_DP_SIZE * (n))
162 #define CDNS_DPN_B1_CH_EN(n) (0x11C + CDNS_DP_SIZE * (n))
163 #define CDNS_DPN_B1_SAMPLE_CTRL(n) (0x120 + CDNS_DP_SIZE * (n))
164 #define CDNS_DPN_B1_OFFSET_CTRL(n) (0x124 + CDNS_DP_SIZE * (n))
165 #define CDNS_DPN_B1_HCTRL(n) (0x128 + CDNS_DP_SIZE * (n))
166 #define CDNS_DPN_B1_ASYNC_CTRL(n) (0x12C + CDNS_DP_SIZE * (n))
167
168 #define CDNS_DPN_CONFIG_BPM BIT(18)
169 #define CDNS_DPN_CONFIG_BGC GENMASK(17, 16)
170 #define CDNS_DPN_CONFIG_WL GENMASK(12, 8)
171 #define CDNS_DPN_CONFIG_PORT_DAT GENMASK(3, 2)
172 #define CDNS_DPN_CONFIG_PORT_FLOW GENMASK(1, 0)
173
174 #define CDNS_DPN_SAMPLE_CTRL_SI GENMASK(15, 0)
175
176 #define CDNS_DPN_OFFSET_CTRL_1 GENMASK(7, 0)
177 #define CDNS_DPN_OFFSET_CTRL_2 GENMASK(15, 8)
178
179 #define CDNS_DPN_HCTRL_HSTOP GENMASK(3, 0)
180 #define CDNS_DPN_HCTRL_HSTART GENMASK(7, 4)
181 #define CDNS_DPN_HCTRL_LCTRL GENMASK(10, 8)
182
183 #define CDNS_PORTCTRL 0x130
184 #define CDNS_PORTCTRL_TEST_FAILED BIT(1)
185 #define CDNS_PORTCTRL_DIRN BIT(7)
186 #define CDNS_PORTCTRL_BANK_INVERT BIT(8)
187
188 #define CDNS_PORT_OFFSET 0x80
189
190 #define CDNS_PDI_CONFIG(n) (0x1100 + (n) * 16)
191
192 #define CDNS_PDI_CONFIG_SOFT_RESET BIT(24)
193 #define CDNS_PDI_CONFIG_CHANNEL GENMASK(15, 8)
194 #define CDNS_PDI_CONFIG_PORT GENMASK(4, 0)
195
196 /* Driver defaults */
197 #define CDNS_TX_TIMEOUT 500
198
199 #define CDNS_SCP_RX_FIFOLEVEL 0x2
200
201 /*
202 * register accessor helpers
203 */
cdns_readl(struct sdw_cdns * cdns,int offset)204 static inline u32 cdns_readl(struct sdw_cdns *cdns, int offset)
205 {
206 return readl(cdns->registers + offset);
207 }
208
cdns_writel(struct sdw_cdns * cdns,int offset,u32 value)209 static inline void cdns_writel(struct sdw_cdns *cdns, int offset, u32 value)
210 {
211 writel(value, cdns->registers + offset);
212 }
213
cdns_ip_readl(struct sdw_cdns * cdns,int offset)214 static inline u32 cdns_ip_readl(struct sdw_cdns *cdns, int offset)
215 {
216 return cdns_readl(cdns, cdns->ip_offset + offset);
217 }
218
cdns_ip_writel(struct sdw_cdns * cdns,int offset,u32 value)219 static inline void cdns_ip_writel(struct sdw_cdns *cdns, int offset, u32 value)
220 {
221 return cdns_writel(cdns, cdns->ip_offset + offset, value);
222 }
223
cdns_updatel(struct sdw_cdns * cdns,int offset,u32 mask,u32 val)224 static inline void cdns_updatel(struct sdw_cdns *cdns,
225 int offset, u32 mask, u32 val)
226 {
227 u32 tmp;
228
229 tmp = cdns_readl(cdns, offset);
230 tmp = (tmp & ~mask) | val;
231 cdns_writel(cdns, offset, tmp);
232 }
233
cdns_ip_updatel(struct sdw_cdns * cdns,int offset,u32 mask,u32 val)234 static inline void cdns_ip_updatel(struct sdw_cdns *cdns,
235 int offset, u32 mask, u32 val)
236 {
237 cdns_updatel(cdns, cdns->ip_offset + offset, mask, val);
238 }
239
cdns_set_wait(struct sdw_cdns * cdns,int offset,u32 mask,u32 value)240 static int cdns_set_wait(struct sdw_cdns *cdns, int offset, u32 mask, u32 value)
241 {
242 int timeout = 10;
243 u32 reg_read;
244
245 /* Wait for bit to be set */
246 do {
247 reg_read = readl(cdns->registers + offset);
248 if ((reg_read & mask) == value)
249 return 0;
250
251 timeout--;
252 usleep_range(50, 100);
253 } while (timeout != 0);
254
255 return -ETIMEDOUT;
256 }
257
cdns_clear_bit(struct sdw_cdns * cdns,int offset,u32 value)258 static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value)
259 {
260 writel(value, cdns->registers + offset);
261
262 /* Wait for bit to be self cleared */
263 return cdns_set_wait(cdns, offset, value, 0);
264 }
265
266 /*
267 * all changes to the MCP_CONFIG, MCP_CONTROL, MCP_CMDCTRL and MCP_PHYCTRL
268 * need to be confirmed with a write to MCP_CONFIG_UPDATE
269 */
cdns_config_update(struct sdw_cdns * cdns)270 static int cdns_config_update(struct sdw_cdns *cdns)
271 {
272 int ret;
273
274 if (sdw_cdns_is_clock_stop(cdns)) {
275 dev_err(cdns->dev, "Cannot program MCP_CONFIG_UPDATE in ClockStopMode\n");
276 return -EINVAL;
277 }
278
279 ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE,
280 CDNS_MCP_CONFIG_UPDATE_BIT);
281 if (ret < 0)
282 dev_err(cdns->dev, "Config update timedout\n");
283
284 return ret;
285 }
286
287 /**
288 * sdw_cdns_config_update() - Update configurations
289 * @cdns: Cadence instance
290 */
sdw_cdns_config_update(struct sdw_cdns * cdns)291 void sdw_cdns_config_update(struct sdw_cdns *cdns)
292 {
293 /* commit changes */
294 cdns_writel(cdns, CDNS_MCP_CONFIG_UPDATE, CDNS_MCP_CONFIG_UPDATE_BIT);
295 }
296 EXPORT_SYMBOL(sdw_cdns_config_update);
297
298 /**
299 * sdw_cdns_config_update_set_wait() - wait until configuration update bit is self-cleared
300 * @cdns: Cadence instance
301 */
sdw_cdns_config_update_set_wait(struct sdw_cdns * cdns)302 int sdw_cdns_config_update_set_wait(struct sdw_cdns *cdns)
303 {
304 /* the hardware recommendation is to wait at least 300us */
305 return cdns_set_wait(cdns, CDNS_MCP_CONFIG_UPDATE,
306 CDNS_MCP_CONFIG_UPDATE_BIT, 0);
307 }
308 EXPORT_SYMBOL(sdw_cdns_config_update_set_wait);
309
310 /*
311 * debugfs
312 */
313 #ifdef CONFIG_DEBUG_FS
314
315 #define RD_BUF (2 * PAGE_SIZE)
316
cdns_sprintf(struct sdw_cdns * cdns,char * buf,size_t pos,unsigned int reg)317 static ssize_t cdns_sprintf(struct sdw_cdns *cdns,
318 char *buf, size_t pos, unsigned int reg)
319 {
320 return scnprintf(buf + pos, RD_BUF - pos,
321 "%4x\t%8x\n", reg, cdns_readl(cdns, reg));
322 }
323
cdns_reg_show(struct seq_file * s,void * data)324 static int cdns_reg_show(struct seq_file *s, void *data)
325 {
326 struct sdw_cdns *cdns = s->private;
327 ssize_t ret;
328 int num_ports;
329 int i, j;
330
331 char *buf __free(kfree) = kzalloc(RD_BUF, GFP_KERNEL);
332 if (!buf)
333 return -ENOMEM;
334
335 ret = scnprintf(buf, RD_BUF, "Register Value\n");
336 ret += scnprintf(buf + ret, RD_BUF - ret, "\nMCP Registers\n");
337 /* 8 MCP registers */
338 for (i = CDNS_MCP_CONFIG; i <= CDNS_MCP_PHYCTRL; i += sizeof(u32))
339 ret += cdns_sprintf(cdns, buf, ret, i);
340
341 ret += scnprintf(buf + ret, RD_BUF - ret,
342 "\nStatus & Intr Registers\n");
343 /* 13 Status & Intr registers (offsets 0x70 and 0x74 not defined) */
344 for (i = CDNS_MCP_STAT; i <= CDNS_MCP_FIFOSTAT; i += sizeof(u32))
345 ret += cdns_sprintf(cdns, buf, ret, i);
346
347 ret += scnprintf(buf + ret, RD_BUF - ret,
348 "\nSSP & Clk ctrl Registers\n");
349 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL0);
350 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL1);
351 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL0);
352 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL1);
353
354 ret += scnprintf(buf + ret, RD_BUF - ret,
355 "\nDPn B0 Registers\n");
356
357 num_ports = cdns->num_ports;
358
359 for (i = 0; i < num_ports; i++) {
360 ret += scnprintf(buf + ret, RD_BUF - ret,
361 "\nDP-%d\n", i);
362 for (j = CDNS_DPN_B0_CONFIG(i);
363 j < CDNS_DPN_B0_ASYNC_CTRL(i); j += sizeof(u32))
364 ret += cdns_sprintf(cdns, buf, ret, j);
365 }
366
367 ret += scnprintf(buf + ret, RD_BUF - ret,
368 "\nDPn B1 Registers\n");
369 for (i = 0; i < num_ports; i++) {
370 ret += scnprintf(buf + ret, RD_BUF - ret,
371 "\nDP-%d\n", i);
372
373 for (j = CDNS_DPN_B1_CONFIG(i);
374 j < CDNS_DPN_B1_ASYNC_CTRL(i); j += sizeof(u32))
375 ret += cdns_sprintf(cdns, buf, ret, j);
376 }
377
378 ret += scnprintf(buf + ret, RD_BUF - ret,
379 "\nDPn Control Registers\n");
380 for (i = 0; i < num_ports; i++)
381 ret += cdns_sprintf(cdns, buf, ret,
382 CDNS_PORTCTRL + i * CDNS_PORT_OFFSET);
383
384 ret += scnprintf(buf + ret, RD_BUF - ret,
385 "\nPDIn Config Registers\n");
386
387 /* number of PDI and ports is interchangeable */
388 for (i = 0; i < num_ports; i++)
389 ret += cdns_sprintf(cdns, buf, ret, CDNS_PDI_CONFIG(i));
390
391 seq_printf(s, "%s", buf);
392
393 return 0;
394 }
395 DEFINE_SHOW_ATTRIBUTE(cdns_reg);
396
cdns_hw_reset(void * data,u64 value)397 static int cdns_hw_reset(void *data, u64 value)
398 {
399 struct sdw_cdns *cdns = data;
400 int ret;
401
402 if (value != 1)
403 return -EINVAL;
404
405 /* Userspace changed the hardware state behind the kernel's back */
406 add_taint(TAINT_USER, LOCKDEP_STILL_OK);
407
408 ret = sdw_cdns_exit_reset(cdns);
409
410 dev_dbg(cdns->dev, "link hw_reset done: %d\n", ret);
411
412 return ret;
413 }
414
415 DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n");
416
cdns_parity_error_injection(void * data,u64 value)417 static int cdns_parity_error_injection(void *data, u64 value)
418 {
419 struct sdw_cdns *cdns = data;
420 struct sdw_bus *bus;
421 int ret;
422
423 if (value != 1)
424 return -EINVAL;
425
426 bus = &cdns->bus;
427
428 /*
429 * Resume Master device. If this results in a bus reset, the
430 * Slave devices will re-attach and be re-enumerated.
431 */
432 ret = pm_runtime_resume_and_get(bus->dev);
433 if (ret < 0 && ret != -EACCES) {
434 dev_err_ratelimited(cdns->dev,
435 "pm_runtime_resume_and_get failed in %s, ret %d\n",
436 __func__, ret);
437 return ret;
438 }
439
440 /*
441 * wait long enough for Slave(s) to be in steady state. This
442 * does not need to be super precise.
443 */
444 msleep(200);
445
446 /*
447 * Take the bus lock here to make sure that any bus transactions
448 * will be queued while we inject a parity error on a dummy read
449 */
450 mutex_lock(&bus->bus_lock);
451
452 /* program hardware to inject parity error */
453 cdns_ip_updatel(cdns, CDNS_IP_MCP_CMDCTRL,
454 CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR,
455 CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR);
456
457 /* commit changes */
458 ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE, CDNS_MCP_CONFIG_UPDATE_BIT);
459 if (ret < 0)
460 goto unlock;
461
462 /* do a broadcast dummy read to avoid bus clashes */
463 ret = sdw_bread_no_pm_unlocked(&cdns->bus, 0xf, SDW_SCP_DEVID_0);
464 dev_info(cdns->dev, "parity error injection, read: %d\n", ret);
465
466 /* program hardware to disable parity error */
467 cdns_ip_updatel(cdns, CDNS_IP_MCP_CMDCTRL,
468 CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR,
469 0);
470
471 /* commit changes */
472 ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE, CDNS_MCP_CONFIG_UPDATE_BIT);
473 if (ret < 0)
474 goto unlock;
475
476 /* Userspace changed the hardware state behind the kernel's back */
477 add_taint(TAINT_USER, LOCKDEP_STILL_OK);
478
479 unlock:
480 /* Continue bus operation with parity error injection disabled */
481 mutex_unlock(&bus->bus_lock);
482
483 /*
484 * allow Master device to enter pm_runtime suspend. This may
485 * also result in Slave devices suspending.
486 */
487 pm_runtime_mark_last_busy(bus->dev);
488 pm_runtime_put_autosuspend(bus->dev);
489
490 return 0;
491 }
492
493 DEFINE_DEBUGFS_ATTRIBUTE(cdns_parity_error_fops, NULL,
494 cdns_parity_error_injection, "%llu\n");
495
cdns_set_pdi_loopback_source(void * data,u64 value)496 static int cdns_set_pdi_loopback_source(void *data, u64 value)
497 {
498 struct sdw_cdns *cdns = data;
499 unsigned int pdi_out_num = cdns->pcm.num_bd + cdns->pcm.num_out;
500
501 if (value > pdi_out_num)
502 return -EINVAL;
503
504 /* Userspace changed the hardware state behind the kernel's back */
505 add_taint(TAINT_USER, LOCKDEP_STILL_OK);
506
507 cdns->pdi_loopback_source = value;
508
509 return 0;
510 }
511 DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_source_fops, NULL, cdns_set_pdi_loopback_source, "%llu\n");
512
cdns_set_pdi_loopback_target(void * data,u64 value)513 static int cdns_set_pdi_loopback_target(void *data, u64 value)
514 {
515 struct sdw_cdns *cdns = data;
516 unsigned int pdi_in_num = cdns->pcm.num_bd + cdns->pcm.num_in;
517
518 if (value > pdi_in_num)
519 return -EINVAL;
520
521 /* Userspace changed the hardware state behind the kernel's back */
522 add_taint(TAINT_USER, LOCKDEP_STILL_OK);
523
524 cdns->pdi_loopback_target = value;
525
526 return 0;
527 }
528 DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_target_fops, NULL, cdns_set_pdi_loopback_target, "%llu\n");
529
530 /**
531 * sdw_cdns_debugfs_init() - Cadence debugfs init
532 * @cdns: Cadence instance
533 * @root: debugfs root
534 */
sdw_cdns_debugfs_init(struct sdw_cdns * cdns,struct dentry * root)535 void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root)
536 {
537 debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops);
538
539 debugfs_create_file("cdns-hw-reset", 0200, root, cdns,
540 &cdns_hw_reset_fops);
541
542 debugfs_create_file("cdns-parity-error-injection", 0200, root, cdns,
543 &cdns_parity_error_fops);
544
545 cdns->pdi_loopback_source = -1;
546 cdns->pdi_loopback_target = -1;
547
548 debugfs_create_file("cdns-pdi-loopback-source", 0200, root, cdns,
549 &cdns_pdi_loopback_source_fops);
550
551 debugfs_create_file("cdns-pdi-loopback-target", 0200, root, cdns,
552 &cdns_pdi_loopback_target_fops);
553
554 }
555 EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init);
556
557 #endif /* CONFIG_DEBUG_FS */
558
559 /*
560 * IO Calls
561 */
562 static enum sdw_command_response
cdns_fill_msg_resp(struct sdw_cdns * cdns,struct sdw_msg * msg,int count,int offset)563 cdns_fill_msg_resp(struct sdw_cdns *cdns,
564 struct sdw_msg *msg, int count, int offset)
565 {
566 int nack = 0, no_ack = 0;
567 int i;
568
569 /* check message response */
570 for (i = 0; i < count; i++) {
571 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
572 no_ack = 1;
573 dev_vdbg(cdns->dev, "Msg Ack not received, cmd %d\n", i);
574 }
575 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
576 nack = 1;
577 dev_err_ratelimited(cdns->dev, "Msg NACK received, cmd %d\n", i);
578 }
579 }
580
581 if (nack) {
582 dev_err_ratelimited(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num);
583 return SDW_CMD_FAIL;
584 }
585
586 if (no_ack) {
587 dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num);
588 return SDW_CMD_IGNORED;
589 }
590
591 if (msg->flags == SDW_MSG_FLAG_READ) {
592 /* fill response */
593 for (i = 0; i < count; i++)
594 msg->buf[i + offset] = FIELD_GET(CDNS_MCP_RESP_RDATA,
595 cdns->response_buf[i]);
596 }
597
598 return SDW_CMD_OK;
599 }
600
cdns_read_response(struct sdw_cdns * cdns)601 static void cdns_read_response(struct sdw_cdns *cdns)
602 {
603 u32 num_resp, cmd_base;
604 int i;
605
606 /* RX_FIFO_AVAIL can be 2 entries more than the FIFO size */
607 BUILD_BUG_ON(ARRAY_SIZE(cdns->response_buf) < CDNS_MCP_CMD_LEN + 2);
608
609 num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT);
610 num_resp &= CDNS_MCP_RX_FIFO_AVAIL;
611 if (num_resp > ARRAY_SIZE(cdns->response_buf)) {
612 dev_warn(cdns->dev, "RX AVAIL %d too long\n", num_resp);
613 num_resp = ARRAY_SIZE(cdns->response_buf);
614 }
615
616 cmd_base = CDNS_IP_MCP_CMD_BASE;
617
618 for (i = 0; i < num_resp; i++) {
619 cdns->response_buf[i] = cdns_ip_readl(cdns, cmd_base);
620 cmd_base += CDNS_MCP_CMD_WORD_LEN;
621 }
622 }
623
624 static enum sdw_command_response
_cdns_xfer_msg(struct sdw_cdns * cdns,struct sdw_msg * msg,int cmd,int offset,int count,bool defer)625 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd,
626 int offset, int count, bool defer)
627 {
628 unsigned long time;
629 u32 base, i, data;
630 u16 addr;
631
632 /* Program the watermark level for RX FIFO */
633 if (cdns->msg_count != count) {
634 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count);
635 cdns->msg_count = count;
636 }
637
638 base = CDNS_IP_MCP_CMD_BASE;
639 addr = msg->addr + offset;
640
641 for (i = 0; i < count; i++) {
642 data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
643 data |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, cmd);
644 data |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, addr);
645 addr++;
646
647 if (msg->flags == SDW_MSG_FLAG_WRITE)
648 data |= msg->buf[i + offset];
649
650 data |= FIELD_PREP(CDNS_MCP_CMD_SSP_TAG, msg->ssp_sync);
651 cdns_ip_writel(cdns, base, data);
652 base += CDNS_MCP_CMD_WORD_LEN;
653 }
654
655 if (defer)
656 return SDW_CMD_OK;
657
658 /* wait for timeout or response */
659 time = wait_for_completion_timeout(&cdns->tx_complete,
660 msecs_to_jiffies(CDNS_TX_TIMEOUT));
661 if (!time) {
662 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n",
663 cmd, msg->dev_num, msg->addr, msg->len);
664 msg->len = 0;
665
666 /* Drain anything in the RX_FIFO */
667 cdns_read_response(cdns);
668
669 return SDW_CMD_TIMEOUT;
670 }
671
672 return cdns_fill_msg_resp(cdns, msg, count, offset);
673 }
674
675 static enum sdw_command_response
cdns_program_scp_addr(struct sdw_cdns * cdns,struct sdw_msg * msg)676 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg)
677 {
678 int nack = 0, no_ack = 0;
679 unsigned long time;
680 u32 data[2], base;
681 int i;
682
683 /* Program the watermark level for RX FIFO */
684 if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) {
685 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL);
686 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL;
687 }
688
689 data[0] = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
690 data[0] |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, 0x3);
691 data[1] = data[0];
692
693 data[0] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE1);
694 data[1] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE2);
695
696 data[0] |= msg->addr_page1;
697 data[1] |= msg->addr_page2;
698
699 base = CDNS_IP_MCP_CMD_BASE;
700 cdns_ip_writel(cdns, base, data[0]);
701 base += CDNS_MCP_CMD_WORD_LEN;
702 cdns_ip_writel(cdns, base, data[1]);
703
704 time = wait_for_completion_timeout(&cdns->tx_complete,
705 msecs_to_jiffies(CDNS_TX_TIMEOUT));
706 if (!time) {
707 dev_err(cdns->dev, "SCP Msg trf timed out\n");
708 msg->len = 0;
709 return SDW_CMD_TIMEOUT;
710 }
711
712 /* check response the writes */
713 for (i = 0; i < 2; i++) {
714 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
715 no_ack = 1;
716 dev_err(cdns->dev, "Program SCP Ack not received\n");
717 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
718 nack = 1;
719 dev_err(cdns->dev, "Program SCP NACK received\n");
720 }
721 }
722 }
723
724 /* For NACK, NO ack, don't return err if we are in Broadcast mode */
725 if (nack) {
726 dev_err_ratelimited(cdns->dev,
727 "SCP_addrpage NACKed for Slave %d\n", msg->dev_num);
728 return SDW_CMD_FAIL;
729 }
730
731 if (no_ack) {
732 dev_dbg_ratelimited(cdns->dev,
733 "SCP_addrpage ignored for Slave %d\n", msg->dev_num);
734 return SDW_CMD_IGNORED;
735 }
736
737 return SDW_CMD_OK;
738 }
739
cdns_prep_msg(struct sdw_cdns * cdns,struct sdw_msg * msg,int * cmd)740 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd)
741 {
742 int ret;
743
744 if (msg->page) {
745 ret = cdns_program_scp_addr(cdns, msg);
746 if (ret) {
747 msg->len = 0;
748 return ret;
749 }
750 }
751
752 switch (msg->flags) {
753 case SDW_MSG_FLAG_READ:
754 *cmd = CDNS_MCP_CMD_READ;
755 break;
756
757 case SDW_MSG_FLAG_WRITE:
758 *cmd = CDNS_MCP_CMD_WRITE;
759 break;
760
761 default:
762 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags);
763 return -EINVAL;
764 }
765
766 return 0;
767 }
768
769 enum sdw_command_response
cdns_xfer_msg(struct sdw_bus * bus,struct sdw_msg * msg)770 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg)
771 {
772 struct sdw_cdns *cdns = bus_to_cdns(bus);
773 int cmd = 0, ret, i;
774
775 ret = cdns_prep_msg(cdns, msg, &cmd);
776 if (ret)
777 return SDW_CMD_FAIL_OTHER;
778
779 for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) {
780 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
781 CDNS_MCP_CMD_LEN, false);
782 if (ret != SDW_CMD_OK)
783 return ret;
784 }
785
786 if (!(msg->len % CDNS_MCP_CMD_LEN))
787 return SDW_CMD_OK;
788
789 return _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
790 msg->len % CDNS_MCP_CMD_LEN, false);
791 }
792 EXPORT_SYMBOL(cdns_xfer_msg);
793
794 enum sdw_command_response
cdns_xfer_msg_defer(struct sdw_bus * bus)795 cdns_xfer_msg_defer(struct sdw_bus *bus)
796 {
797 struct sdw_cdns *cdns = bus_to_cdns(bus);
798 struct sdw_defer *defer = &bus->defer_msg;
799 struct sdw_msg *msg = defer->msg;
800 int cmd = 0, ret;
801
802 /* for defer only 1 message is supported */
803 if (msg->len > 1)
804 return -ENOTSUPP;
805
806 ret = cdns_prep_msg(cdns, msg, &cmd);
807 if (ret)
808 return SDW_CMD_FAIL_OTHER;
809
810 return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true);
811 }
812 EXPORT_SYMBOL(cdns_xfer_msg_defer);
813
cdns_read_ping_status(struct sdw_bus * bus)814 u32 cdns_read_ping_status(struct sdw_bus *bus)
815 {
816 struct sdw_cdns *cdns = bus_to_cdns(bus);
817
818 return cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
819 }
820 EXPORT_SYMBOL(cdns_read_ping_status);
821
822 /*
823 * IRQ handling
824 */
825
cdns_update_slave_status(struct sdw_cdns * cdns,u64 slave_intstat)826 static int cdns_update_slave_status(struct sdw_cdns *cdns,
827 u64 slave_intstat)
828 {
829 enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
830 bool is_slave = false;
831 u32 mask;
832 u32 val;
833 int i, set_status;
834
835 memset(status, 0, sizeof(status));
836
837 for (i = 0; i <= SDW_MAX_DEVICES; i++) {
838 mask = (slave_intstat >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) &
839 CDNS_MCP_SLAVE_STATUS_BITS;
840
841 set_status = 0;
842
843 if (mask) {
844 is_slave = true;
845
846 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) {
847 status[i] = SDW_SLAVE_RESERVED;
848 set_status++;
849 }
850
851 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) {
852 status[i] = SDW_SLAVE_ATTACHED;
853 set_status++;
854 }
855
856 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) {
857 status[i] = SDW_SLAVE_ALERT;
858 set_status++;
859 }
860
861 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) {
862 status[i] = SDW_SLAVE_UNATTACHED;
863 set_status++;
864 }
865 }
866
867 /*
868 * check that there was a single reported Slave status and when
869 * there is not use the latest status extracted from PING commands
870 */
871 if (set_status != 1) {
872 val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
873 val >>= (i * 2);
874
875 switch (val & 0x3) {
876 case 0:
877 status[i] = SDW_SLAVE_UNATTACHED;
878 break;
879 case 1:
880 status[i] = SDW_SLAVE_ATTACHED;
881 break;
882 case 2:
883 status[i] = SDW_SLAVE_ALERT;
884 break;
885 case 3:
886 default:
887 status[i] = SDW_SLAVE_RESERVED;
888 break;
889 }
890 }
891 }
892
893 if (is_slave)
894 return sdw_handle_slave_status(&cdns->bus, status);
895
896 return 0;
897 }
898
899 /**
900 * sdw_cdns_irq() - Cadence interrupt handler
901 * @irq: irq number
902 * @dev_id: irq context
903 */
sdw_cdns_irq(int irq,void * dev_id)904 irqreturn_t sdw_cdns_irq(int irq, void *dev_id)
905 {
906 struct sdw_cdns *cdns = dev_id;
907 u32 int_status;
908
909 /* Check if the link is up */
910 if (!cdns->link_up)
911 return IRQ_NONE;
912
913 int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT);
914
915 /* check for reserved values read as zero */
916 if (int_status & CDNS_MCP_INT_RESERVED)
917 return IRQ_NONE;
918
919 if (!(int_status & CDNS_MCP_INT_IRQ))
920 return IRQ_NONE;
921
922 if (int_status & CDNS_MCP_INT_RX_WL) {
923 struct sdw_bus *bus = &cdns->bus;
924 struct sdw_defer *defer = &bus->defer_msg;
925
926 cdns_read_response(cdns);
927
928 if (defer && defer->msg) {
929 cdns_fill_msg_resp(cdns, defer->msg,
930 defer->length, 0);
931 complete(&defer->complete);
932 } else {
933 complete(&cdns->tx_complete);
934 }
935 }
936
937 if (int_status & CDNS_MCP_INT_PARITY) {
938 /* Parity error detected by Master */
939 dev_err_ratelimited(cdns->dev, "Parity error\n");
940 }
941
942 if (int_status & CDNS_MCP_INT_CTRL_CLASH) {
943 /* Slave is driving bit slot during control word */
944 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n");
945 }
946
947 if (int_status & CDNS_MCP_INT_DATA_CLASH) {
948 /*
949 * Multiple slaves trying to drive bit slot, or issue with
950 * ownership of data bits or Slave gone bonkers
951 */
952 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n");
953 }
954
955 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL &&
956 int_status & CDNS_MCP_INT_DPINT) {
957 u32 port_intstat;
958
959 /* just log which ports report an error */
960 port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT);
961 dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n",
962 port_intstat);
963
964 /* clear status w/ write1 */
965 cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat);
966 }
967
968 if (int_status & CDNS_MCP_INT_SLAVE_MASK) {
969 /* Mask the Slave interrupt and wake thread */
970 cdns_updatel(cdns, CDNS_MCP_INTMASK,
971 CDNS_MCP_INT_SLAVE_MASK, 0);
972
973 int_status &= ~CDNS_MCP_INT_SLAVE_MASK;
974
975 /*
976 * Deal with possible race condition between interrupt
977 * handling and disabling interrupts on suspend.
978 *
979 * If the master is in the process of disabling
980 * interrupts, don't schedule a workqueue
981 */
982 if (cdns->interrupt_enabled)
983 schedule_work(&cdns->work);
984 }
985
986 cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status);
987 return IRQ_HANDLED;
988 }
989 EXPORT_SYMBOL(sdw_cdns_irq);
990
991 /**
992 * cdns_update_slave_status_work - update slave status in a work since we will need to handle
993 * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave
994 * process.
995 * @work: cdns worker thread
996 */
cdns_update_slave_status_work(struct work_struct * work)997 static void cdns_update_slave_status_work(struct work_struct *work)
998 {
999 struct sdw_cdns *cdns =
1000 container_of(work, struct sdw_cdns, work);
1001 u32 slave0, slave1;
1002 u64 slave_intstat;
1003 u32 device0_status;
1004 int retry_count = 0;
1005
1006 /*
1007 * Clear main interrupt first so we don't lose any assertions
1008 * that happen during this function.
1009 */
1010 cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK);
1011
1012 slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
1013 slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
1014
1015 /*
1016 * Clear the bits before handling so we don't lose any
1017 * bits that re-assert.
1018 */
1019 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0);
1020 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1);
1021
1022 /* combine the two status */
1023 slave_intstat = ((u64)slave1 << 32) | slave0;
1024
1025 dev_dbg_ratelimited(cdns->dev, "Slave status change: 0x%llx\n", slave_intstat);
1026
1027 update_status:
1028 cdns_update_slave_status(cdns, slave_intstat);
1029
1030 /*
1031 * When there is more than one peripheral per link, it's
1032 * possible that a deviceB becomes attached after we deal with
1033 * the attachment of deviceA. Since the hardware does a
1034 * logical AND, the attachment of the second device does not
1035 * change the status seen by the driver.
1036 *
1037 * In that case, clearing the registers above would result in
1038 * the deviceB never being detected - until a change of status
1039 * is observed on the bus.
1040 *
1041 * To avoid this race condition, re-check if any device0 needs
1042 * attention with PING commands. There is no need to check for
1043 * ALERTS since they are not allowed until a non-zero
1044 * device_number is assigned.
1045 *
1046 * Do not clear the INTSTAT0/1. While looping to enumerate devices on
1047 * #0 there could be status changes on other devices - these must
1048 * be kept in the INTSTAT so they can be handled when all #0 devices
1049 * have been handled.
1050 */
1051
1052 device0_status = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
1053 device0_status &= 3;
1054
1055 if (device0_status == SDW_SLAVE_ATTACHED) {
1056 if (retry_count++ < SDW_MAX_DEVICES) {
1057 dev_dbg_ratelimited(cdns->dev,
1058 "Device0 detected after clearing status, iteration %d\n",
1059 retry_count);
1060 slave_intstat = CDNS_MCP_SLAVE_INTSTAT_ATTACHED;
1061 goto update_status;
1062 } else {
1063 dev_err_ratelimited(cdns->dev,
1064 "Device0 detected after %d iterations\n",
1065 retry_count);
1066 }
1067 }
1068
1069 /* unmask Slave interrupt now */
1070 cdns_updatel(cdns, CDNS_MCP_INTMASK,
1071 CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);
1072
1073 }
1074
1075 /* 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)1076 void sdw_cdns_check_self_clearing_bits(struct sdw_cdns *cdns, const char *string,
1077 bool initial_delay, int reset_iterations)
1078 {
1079 u32 ip_mcp_control;
1080 u32 mcp_control;
1081 u32 mcp_config_update;
1082 int i;
1083
1084 if (initial_delay)
1085 usleep_range(1000, 1500);
1086
1087 ip_mcp_control = cdns_ip_readl(cdns, CDNS_IP_MCP_CONTROL);
1088
1089 /* the following bits should be cleared immediately */
1090 if (ip_mcp_control & CDNS_IP_MCP_CONTROL_SW_RST)
1091 dev_err(cdns->dev, "%s failed: IP_MCP_CONTROL_SW_RST is not cleared\n", string);
1092
1093 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL);
1094
1095 /* the following bits should be cleared immediately */
1096 if (mcp_control & CDNS_MCP_CONTROL_CMD_RST)
1097 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CMD_RST is not cleared\n", string);
1098 if (mcp_control & CDNS_MCP_CONTROL_SOFT_RST)
1099 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SOFT_RST is not cleared\n", string);
1100 if (mcp_control & CDNS_MCP_CONTROL_CLK_STOP_CLR)
1101 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CLK_STOP_CLR is not cleared\n", string);
1102
1103 mcp_config_update = cdns_readl(cdns, CDNS_MCP_CONFIG_UPDATE);
1104 if (mcp_config_update & CDNS_MCP_CONFIG_UPDATE_BIT)
1105 dev_err(cdns->dev, "%s failed: MCP_CONFIG_UPDATE_BIT is not cleared\n", string);
1106
1107 i = 0;
1108 while (mcp_control & CDNS_MCP_CONTROL_HW_RST) {
1109 if (i == reset_iterations) {
1110 dev_err(cdns->dev, "%s failed: MCP_CONTROL_HW_RST is not cleared\n", string);
1111 break;
1112 }
1113
1114 dev_dbg(cdns->dev, "%s: MCP_CONTROL_HW_RST is not cleared at iteration %d\n", string, i);
1115 i++;
1116
1117 usleep_range(1000, 1500);
1118 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL);
1119 }
1120
1121 }
1122 EXPORT_SYMBOL(sdw_cdns_check_self_clearing_bits);
1123
1124 /*
1125 * init routines
1126 */
1127
1128 /**
1129 * sdw_cdns_exit_reset() - Program reset parameters and start bus operations
1130 * @cdns: Cadence instance
1131 */
sdw_cdns_exit_reset(struct sdw_cdns * cdns)1132 int sdw_cdns_exit_reset(struct sdw_cdns *cdns)
1133 {
1134 /* keep reset delay unchanged to 4096 cycles */
1135
1136 /* use hardware generated reset */
1137 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1138 CDNS_MCP_CONTROL_HW_RST,
1139 CDNS_MCP_CONTROL_HW_RST);
1140
1141 /* commit changes */
1142 return cdns_config_update(cdns);
1143 }
1144 EXPORT_SYMBOL(sdw_cdns_exit_reset);
1145
1146 /**
1147 * cdns_enable_slave_interrupts() - Enable SDW slave interrupts
1148 * @cdns: Cadence instance
1149 * @state: boolean for true/false
1150 */
cdns_enable_slave_interrupts(struct sdw_cdns * cdns,bool state)1151 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state)
1152 {
1153 u32 mask;
1154
1155 mask = cdns_readl(cdns, CDNS_MCP_INTMASK);
1156 if (state)
1157 mask |= CDNS_MCP_INT_SLAVE_MASK;
1158 else
1159 mask &= ~CDNS_MCP_INT_SLAVE_MASK;
1160
1161 cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
1162 }
1163
1164 /**
1165 * sdw_cdns_enable_interrupt() - Enable SDW interrupts
1166 * @cdns: Cadence instance
1167 * @state: True if we are trying to enable interrupt.
1168 */
sdw_cdns_enable_interrupt(struct sdw_cdns * cdns,bool state)1169 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)
1170 {
1171 u32 slave_intmask0 = 0;
1172 u32 slave_intmask1 = 0;
1173 u32 mask = 0;
1174
1175 if (!state)
1176 goto update_masks;
1177
1178 slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK;
1179 slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK;
1180
1181 /* enable detection of all slave state changes */
1182 mask = CDNS_MCP_INT_SLAVE_MASK;
1183
1184 /* enable detection of bus issues */
1185 mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
1186 CDNS_MCP_INT_PARITY;
1187
1188 /* port interrupt limited to test modes for now */
1189 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1190 mask |= CDNS_MCP_INT_DPINT;
1191
1192 /* enable detection of RX fifo level */
1193 mask |= CDNS_MCP_INT_RX_WL;
1194
1195 /*
1196 * CDNS_MCP_INT_IRQ needs to be set otherwise all previous
1197 * settings are irrelevant
1198 */
1199 mask |= CDNS_MCP_INT_IRQ;
1200
1201 if (interrupt_mask) /* parameter override */
1202 mask = interrupt_mask;
1203
1204 update_masks:
1205 /* clear slave interrupt status before enabling interrupt */
1206 if (state) {
1207 u32 slave_state;
1208
1209 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
1210 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state);
1211 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
1212 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state);
1213 }
1214 cdns->interrupt_enabled = state;
1215
1216 /*
1217 * Complete any on-going status updates before updating masks,
1218 * and cancel queued status updates.
1219 *
1220 * There could be a race with a new interrupt thrown before
1221 * the 3 mask updates below are complete, so in the interrupt
1222 * we use the 'interrupt_enabled' status to prevent new work
1223 * from being queued.
1224 */
1225 if (!state)
1226 cancel_work_sync(&cdns->work);
1227
1228 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0);
1229 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1);
1230 cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
1231
1232 return 0;
1233 }
1234 EXPORT_SYMBOL(sdw_cdns_enable_interrupt);
1235
cdns_allocate_pdi(struct sdw_cdns * cdns,struct sdw_cdns_pdi ** stream,u32 num)1236 static int cdns_allocate_pdi(struct sdw_cdns *cdns,
1237 struct sdw_cdns_pdi **stream,
1238 u32 num)
1239 {
1240 struct sdw_cdns_pdi *pdi;
1241 int i;
1242
1243 if (!num)
1244 return 0;
1245
1246 pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL);
1247 if (!pdi)
1248 return -ENOMEM;
1249
1250 for (i = 0; i < num; i++) {
1251 pdi[i].num = i;
1252 }
1253
1254 *stream = pdi;
1255 return 0;
1256 }
1257
1258 /**
1259 * sdw_cdns_pdi_init() - PDI initialization routine
1260 *
1261 * @cdns: Cadence instance
1262 * @config: Stream configurations
1263 */
sdw_cdns_pdi_init(struct sdw_cdns * cdns,struct sdw_cdns_stream_config config)1264 int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
1265 struct sdw_cdns_stream_config config)
1266 {
1267 struct sdw_cdns_streams *stream;
1268 int ret;
1269
1270 cdns->pcm.num_bd = config.pcm_bd;
1271 cdns->pcm.num_in = config.pcm_in;
1272 cdns->pcm.num_out = config.pcm_out;
1273
1274 /* Allocate PDIs for PCMs */
1275 stream = &cdns->pcm;
1276
1277 /* we allocate PDI0 and PDI1 which are used for Bulk */
1278 ret = cdns_allocate_pdi(cdns, &stream->bd, stream->num_bd);
1279 if (ret)
1280 return ret;
1281
1282 ret = cdns_allocate_pdi(cdns, &stream->in, stream->num_in);
1283 if (ret)
1284 return ret;
1285
1286 ret = cdns_allocate_pdi(cdns, &stream->out, stream->num_out);
1287 if (ret)
1288 return ret;
1289
1290 /* Update total number of PCM PDIs */
1291 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1292 cdns->num_ports = stream->num_pdi;
1293
1294 return 0;
1295 }
1296 EXPORT_SYMBOL(sdw_cdns_pdi_init);
1297
cdns_set_initial_frame_shape(int n_rows,int n_cols)1298 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
1299 {
1300 u32 val;
1301 int c;
1302 int r;
1303
1304 r = sdw_find_row_index(n_rows);
1305 c = sdw_find_col_index(n_cols);
1306
1307 val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r);
1308 val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c);
1309
1310 return val;
1311 }
1312
cdns_init_clock_ctrl(struct sdw_cdns * cdns)1313 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
1314 {
1315 struct sdw_bus *bus = &cdns->bus;
1316 struct sdw_master_prop *prop = &bus->prop;
1317 u32 val;
1318 u32 ssp_interval;
1319 int divider;
1320
1321 dev_dbg(cdns->dev, "mclk %d max %d row %d col %d\n",
1322 prop->mclk_freq,
1323 prop->max_clk_freq,
1324 prop->default_row,
1325 prop->default_col);
1326
1327 /* Set clock divider */
1328 divider = (prop->mclk_freq / prop->max_clk_freq) - 1;
1329
1330 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0,
1331 CDNS_MCP_CLK_MCLKD_MASK, divider);
1332 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1,
1333 CDNS_MCP_CLK_MCLKD_MASK, divider);
1334
1335 /*
1336 * Frame shape changes after initialization have to be done
1337 * with the bank switch mechanism
1338 */
1339 val = cdns_set_initial_frame_shape(prop->default_row,
1340 prop->default_col);
1341 cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val);
1342
1343 /* Set SSP interval to default value */
1344 ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ;
1345 cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval);
1346 cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval);
1347 }
1348
1349 /**
1350 * sdw_cdns_init() - Cadence initialization
1351 * @cdns: Cadence instance
1352 */
sdw_cdns_init(struct sdw_cdns * cdns)1353 int sdw_cdns_init(struct sdw_cdns *cdns)
1354 {
1355 u32 val;
1356
1357 cdns_init_clock_ctrl(cdns);
1358
1359 sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);
1360
1361 /* reset msg_count to default value of FIFOLEVEL */
1362 cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL);
1363
1364 /* flush command FIFOs */
1365 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST,
1366 CDNS_MCP_CONTROL_CMD_RST);
1367
1368 /* Set cmd accept mode */
1369 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, CDNS_IP_MCP_CONTROL_CMD_ACCEPT,
1370 CDNS_IP_MCP_CONTROL_CMD_ACCEPT);
1371
1372 /* Configure mcp config */
1373 val = cdns_readl(cdns, CDNS_MCP_CONFIG);
1374
1375 /* Disable auto bus release */
1376 val &= ~CDNS_MCP_CONFIG_BUS_REL;
1377
1378 cdns_writel(cdns, CDNS_MCP_CONFIG, val);
1379
1380 /* Configure IP mcp config */
1381 val = cdns_ip_readl(cdns, CDNS_IP_MCP_CONFIG);
1382
1383 /* enable bus operations with clock and data */
1384 val &= ~CDNS_IP_MCP_CONFIG_OP;
1385 val |= CDNS_IP_MCP_CONFIG_OP_NORMAL;
1386
1387 /* Set cmd mode for Tx and Rx cmds */
1388 val &= ~CDNS_IP_MCP_CONFIG_CMD;
1389
1390 /* Disable sniffer mode */
1391 val &= ~CDNS_IP_MCP_CONFIG_SNIFFER;
1392
1393 if (cdns->bus.multi_link)
1394 /* Set Multi-master mode to take gsync into account */
1395 val |= CDNS_IP_MCP_CONFIG_MMASTER;
1396
1397 /* leave frame delay to hardware default of 0x1F */
1398
1399 /* leave command retry to hardware default of 0 */
1400
1401 cdns_ip_writel(cdns, CDNS_IP_MCP_CONFIG, val);
1402
1403 /* changes will be committed later */
1404 return 0;
1405 }
1406 EXPORT_SYMBOL(sdw_cdns_init);
1407
cdns_bus_conf(struct sdw_bus * bus,struct sdw_bus_params * params)1408 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params)
1409 {
1410 struct sdw_master_prop *prop = &bus->prop;
1411 struct sdw_cdns *cdns = bus_to_cdns(bus);
1412 int mcp_clkctrl_off;
1413 int divider;
1414
1415 if (!params->curr_dr_freq) {
1416 dev_err(cdns->dev, "NULL curr_dr_freq\n");
1417 return -EINVAL;
1418 }
1419
1420 divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR /
1421 params->curr_dr_freq;
1422 divider--; /* divider is 1/(N+1) */
1423
1424 if (params->next_bank)
1425 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1;
1426 else
1427 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0;
1428
1429 cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider);
1430
1431 return 0;
1432 }
1433 EXPORT_SYMBOL(cdns_bus_conf);
1434
cdns_port_params(struct sdw_bus * bus,struct sdw_port_params * p_params,unsigned int bank)1435 static int cdns_port_params(struct sdw_bus *bus,
1436 struct sdw_port_params *p_params, unsigned int bank)
1437 {
1438 struct sdw_cdns *cdns = bus_to_cdns(bus);
1439 int dpn_config_off_source;
1440 int dpn_config_off_target;
1441 int target_num = p_params->num;
1442 int source_num = p_params->num;
1443 bool override = false;
1444 int dpn_config;
1445
1446 if (target_num == cdns->pdi_loopback_target &&
1447 cdns->pdi_loopback_source != -1) {
1448 source_num = cdns->pdi_loopback_source;
1449 override = true;
1450 }
1451
1452 if (bank) {
1453 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num);
1454 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num);
1455 } else {
1456 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num);
1457 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num);
1458 }
1459
1460 dpn_config = cdns_readl(cdns, dpn_config_off_source);
1461
1462 /* use port params if there is no loopback, otherwise use source as is */
1463 if (!override) {
1464 u32p_replace_bits(&dpn_config, p_params->bps - 1, CDNS_DPN_CONFIG_WL);
1465 u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW);
1466 u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT);
1467 }
1468
1469 cdns_writel(cdns, dpn_config_off_target, dpn_config);
1470
1471 return 0;
1472 }
1473
cdns_transport_params(struct sdw_bus * bus,struct sdw_transport_params * t_params,enum sdw_reg_bank bank)1474 static int cdns_transport_params(struct sdw_bus *bus,
1475 struct sdw_transport_params *t_params,
1476 enum sdw_reg_bank bank)
1477 {
1478 struct sdw_cdns *cdns = bus_to_cdns(bus);
1479 int dpn_config;
1480 int dpn_config_off_source;
1481 int dpn_config_off_target;
1482 int dpn_hctrl;
1483 int dpn_hctrl_off_source;
1484 int dpn_hctrl_off_target;
1485 int dpn_offsetctrl;
1486 int dpn_offsetctrl_off_source;
1487 int dpn_offsetctrl_off_target;
1488 int dpn_samplectrl;
1489 int dpn_samplectrl_off_source;
1490 int dpn_samplectrl_off_target;
1491 int source_num = t_params->port_num;
1492 int target_num = t_params->port_num;
1493 bool override = false;
1494
1495 if (target_num == cdns->pdi_loopback_target &&
1496 cdns->pdi_loopback_source != -1) {
1497 source_num = cdns->pdi_loopback_source;
1498 override = true;
1499 }
1500
1501 /*
1502 * Note: Only full data port is supported on the Master side for
1503 * both PCM and PDM ports.
1504 */
1505
1506 if (bank) {
1507 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num);
1508 dpn_hctrl_off_source = CDNS_DPN_B1_HCTRL(source_num);
1509 dpn_offsetctrl_off_source = CDNS_DPN_B1_OFFSET_CTRL(source_num);
1510 dpn_samplectrl_off_source = CDNS_DPN_B1_SAMPLE_CTRL(source_num);
1511
1512 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num);
1513 dpn_hctrl_off_target = CDNS_DPN_B1_HCTRL(target_num);
1514 dpn_offsetctrl_off_target = CDNS_DPN_B1_OFFSET_CTRL(target_num);
1515 dpn_samplectrl_off_target = CDNS_DPN_B1_SAMPLE_CTRL(target_num);
1516
1517 } else {
1518 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num);
1519 dpn_hctrl_off_source = CDNS_DPN_B0_HCTRL(source_num);
1520 dpn_offsetctrl_off_source = CDNS_DPN_B0_OFFSET_CTRL(source_num);
1521 dpn_samplectrl_off_source = CDNS_DPN_B0_SAMPLE_CTRL(source_num);
1522
1523 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num);
1524 dpn_hctrl_off_target = CDNS_DPN_B0_HCTRL(target_num);
1525 dpn_offsetctrl_off_target = CDNS_DPN_B0_OFFSET_CTRL(target_num);
1526 dpn_samplectrl_off_target = CDNS_DPN_B0_SAMPLE_CTRL(target_num);
1527 }
1528
1529 dpn_config = cdns_readl(cdns, dpn_config_off_source);
1530 if (!override) {
1531 u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC);
1532 u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM);
1533 }
1534 cdns_writel(cdns, dpn_config_off_target, dpn_config);
1535
1536 if (!override) {
1537 dpn_offsetctrl = 0;
1538 u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1);
1539 u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2);
1540 } else {
1541 dpn_offsetctrl = cdns_readl(cdns, dpn_offsetctrl_off_source);
1542 }
1543 cdns_writel(cdns, dpn_offsetctrl_off_target, dpn_offsetctrl);
1544
1545 if (!override) {
1546 dpn_hctrl = 0;
1547 u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART);
1548 u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP);
1549 u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL);
1550 } else {
1551 dpn_hctrl = cdns_readl(cdns, dpn_hctrl_off_source);
1552 }
1553 cdns_writel(cdns, dpn_hctrl_off_target, dpn_hctrl);
1554
1555 if (!override)
1556 dpn_samplectrl = t_params->sample_interval - 1;
1557 else
1558 dpn_samplectrl = cdns_readl(cdns, dpn_samplectrl_off_source);
1559 cdns_writel(cdns, dpn_samplectrl_off_target, dpn_samplectrl);
1560
1561 return 0;
1562 }
1563
cdns_port_enable(struct sdw_bus * bus,struct sdw_enable_ch * enable_ch,unsigned int bank)1564 static int cdns_port_enable(struct sdw_bus *bus,
1565 struct sdw_enable_ch *enable_ch, unsigned int bank)
1566 {
1567 struct sdw_cdns *cdns = bus_to_cdns(bus);
1568 int dpn_chnen_off, ch_mask;
1569
1570 if (bank)
1571 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num);
1572 else
1573 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num);
1574
1575 ch_mask = enable_ch->ch_mask * enable_ch->enable;
1576 cdns_writel(cdns, dpn_chnen_off, ch_mask);
1577
1578 return 0;
1579 }
1580
1581 static const struct sdw_master_port_ops cdns_port_ops = {
1582 .dpn_set_port_params = cdns_port_params,
1583 .dpn_set_port_transport_params = cdns_transport_params,
1584 .dpn_port_enable_ch = cdns_port_enable,
1585 };
1586
1587 /**
1588 * sdw_cdns_is_clock_stop: Check clock status
1589 *
1590 * @cdns: Cadence instance
1591 */
sdw_cdns_is_clock_stop(struct sdw_cdns * cdns)1592 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns)
1593 {
1594 return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP);
1595 }
1596 EXPORT_SYMBOL(sdw_cdns_is_clock_stop);
1597
1598 /**
1599 * sdw_cdns_clock_stop: Cadence clock stop configuration routine
1600 *
1601 * @cdns: Cadence instance
1602 * @block_wake: prevent wakes if required by the platform
1603 */
sdw_cdns_clock_stop(struct sdw_cdns * cdns,bool block_wake)1604 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake)
1605 {
1606 bool slave_present = false;
1607 struct sdw_slave *slave;
1608 int ret;
1609
1610 sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);
1611
1612 /* Check suspend status */
1613 if (sdw_cdns_is_clock_stop(cdns)) {
1614 dev_dbg(cdns->dev, "Clock is already stopped\n");
1615 return 0;
1616 }
1617
1618 /*
1619 * Before entering clock stop we mask the Slave
1620 * interrupts. This helps avoid having to deal with e.g. a
1621 * Slave becoming UNATTACHED while the clock is being stopped
1622 */
1623 cdns_enable_slave_interrupts(cdns, false);
1624
1625 /*
1626 * For specific platforms, it is required to be able to put
1627 * master into a state in which it ignores wake-up trials
1628 * in clock stop state
1629 */
1630 if (block_wake)
1631 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL,
1632 CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP,
1633 CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP);
1634
1635 list_for_each_entry(slave, &cdns->bus.slaves, node) {
1636 if (slave->status == SDW_SLAVE_ATTACHED ||
1637 slave->status == SDW_SLAVE_ALERT) {
1638 slave_present = true;
1639 break;
1640 }
1641 }
1642
1643 /* commit changes */
1644 ret = cdns_config_update(cdns);
1645 if (ret < 0) {
1646 dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1647 return ret;
1648 }
1649
1650 /* Prepare slaves for clock stop */
1651 if (slave_present) {
1652 ret = sdw_bus_prep_clk_stop(&cdns->bus);
1653 if (ret < 0 && ret != -ENODATA) {
1654 dev_err(cdns->dev, "prepare clock stop failed %d\n", ret);
1655 return ret;
1656 }
1657 }
1658
1659 /*
1660 * Enter clock stop mode and only report errors if there are
1661 * Slave devices present (ALERT or ATTACHED)
1662 */
1663 ret = sdw_bus_clk_stop(&cdns->bus);
1664 if (ret < 0 && slave_present && ret != -ENODATA) {
1665 dev_err(cdns->dev, "bus clock stop failed %d\n", ret);
1666 return ret;
1667 }
1668
1669 ret = cdns_set_wait(cdns, CDNS_MCP_STAT,
1670 CDNS_MCP_STAT_CLK_STOP,
1671 CDNS_MCP_STAT_CLK_STOP);
1672 if (ret < 0)
1673 dev_err(cdns->dev, "Clock stop failed %d\n", ret);
1674
1675 return ret;
1676 }
1677 EXPORT_SYMBOL(sdw_cdns_clock_stop);
1678
1679 /**
1680 * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine
1681 *
1682 * @cdns: Cadence instance
1683 * @bus_reset: context may be lost while in low power modes and the bus
1684 * may require a Severe Reset and re-enumeration after a wake.
1685 */
sdw_cdns_clock_restart(struct sdw_cdns * cdns,bool bus_reset)1686 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset)
1687 {
1688 int ret;
1689
1690 /* unmask Slave interrupts that were masked when stopping the clock */
1691 cdns_enable_slave_interrupts(cdns, true);
1692
1693 ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,
1694 CDNS_MCP_CONTROL_CLK_STOP_CLR);
1695 if (ret < 0) {
1696 dev_err(cdns->dev, "Couldn't exit from clock stop\n");
1697 return ret;
1698 }
1699
1700 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0);
1701 if (ret < 0) {
1702 dev_err(cdns->dev, "clock stop exit failed %d\n", ret);
1703 return ret;
1704 }
1705
1706 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL,
1707 CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP, 0);
1708
1709 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, CDNS_IP_MCP_CONTROL_CMD_ACCEPT,
1710 CDNS_IP_MCP_CONTROL_CMD_ACCEPT);
1711
1712 if (!bus_reset) {
1713
1714 /* enable bus operations with clock and data */
1715 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONFIG,
1716 CDNS_IP_MCP_CONFIG_OP,
1717 CDNS_IP_MCP_CONFIG_OP_NORMAL);
1718
1719 ret = cdns_config_update(cdns);
1720 if (ret < 0) {
1721 dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1722 return ret;
1723 }
1724
1725 ret = sdw_bus_exit_clk_stop(&cdns->bus);
1726 if (ret < 0)
1727 dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret);
1728 }
1729
1730 return ret;
1731 }
1732 EXPORT_SYMBOL(sdw_cdns_clock_restart);
1733
1734 /**
1735 * sdw_cdns_probe() - Cadence probe routine
1736 * @cdns: Cadence instance
1737 */
sdw_cdns_probe(struct sdw_cdns * cdns)1738 int sdw_cdns_probe(struct sdw_cdns *cdns)
1739 {
1740 init_completion(&cdns->tx_complete);
1741 cdns->bus.port_ops = &cdns_port_ops;
1742
1743 INIT_WORK(&cdns->work, cdns_update_slave_status_work);
1744 return 0;
1745 }
1746 EXPORT_SYMBOL(sdw_cdns_probe);
1747
cdns_set_sdw_stream(struct snd_soc_dai * dai,void * stream,int direction)1748 int cdns_set_sdw_stream(struct snd_soc_dai *dai,
1749 void *stream, int direction)
1750 {
1751 struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
1752 struct sdw_cdns_dai_runtime *dai_runtime;
1753
1754 dai_runtime = cdns->dai_runtime_array[dai->id];
1755
1756 if (stream) {
1757 /* first paranoia check */
1758 if (dai_runtime) {
1759 dev_err(dai->dev,
1760 "dai_runtime already allocated for dai %s\n",
1761 dai->name);
1762 return -EINVAL;
1763 }
1764
1765 /* allocate and set dai_runtime info */
1766 dai_runtime = kzalloc(sizeof(*dai_runtime), GFP_KERNEL);
1767 if (!dai_runtime)
1768 return -ENOMEM;
1769
1770 dai_runtime->stream_type = SDW_STREAM_PCM;
1771
1772 dai_runtime->bus = &cdns->bus;
1773 dai_runtime->link_id = cdns->instance;
1774
1775 dai_runtime->stream = stream;
1776 dai_runtime->direction = direction;
1777
1778 cdns->dai_runtime_array[dai->id] = dai_runtime;
1779 } else {
1780 /* second paranoia check */
1781 if (!dai_runtime) {
1782 dev_err(dai->dev,
1783 "dai_runtime not allocated for dai %s\n",
1784 dai->name);
1785 return -EINVAL;
1786 }
1787
1788 /* for NULL stream we release allocated dai_runtime */
1789 kfree(dai_runtime);
1790 cdns->dai_runtime_array[dai->id] = NULL;
1791 }
1792 return 0;
1793 }
1794 EXPORT_SYMBOL(cdns_set_sdw_stream);
1795
1796 /**
1797 * cdns_find_pdi() - Find a free PDI
1798 *
1799 * @cdns: Cadence instance
1800 * @num: Number of PDIs
1801 * @pdi: PDI instances
1802 * @dai_id: DAI id
1803 *
1804 * Find a PDI for a given PDI array. The PDI num and dai_id are
1805 * expected to match, return NULL otherwise.
1806 */
cdns_find_pdi(struct sdw_cdns * cdns,unsigned int num,struct sdw_cdns_pdi * pdi,int dai_id)1807 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns,
1808 unsigned int num,
1809 struct sdw_cdns_pdi *pdi,
1810 int dai_id)
1811 {
1812 int i;
1813
1814 for (i = 0; i < num; i++)
1815 if (pdi[i].num == dai_id)
1816 return &pdi[i];
1817
1818 return NULL;
1819 }
1820
1821 /**
1822 * sdw_cdns_config_stream: Configure a stream
1823 *
1824 * @cdns: Cadence instance
1825 * @ch: Channel count
1826 * @dir: Data direction
1827 * @pdi: PDI to be used
1828 */
sdw_cdns_config_stream(struct sdw_cdns * cdns,u32 ch,u32 dir,struct sdw_cdns_pdi * pdi)1829 void sdw_cdns_config_stream(struct sdw_cdns *cdns,
1830 u32 ch, u32 dir, struct sdw_cdns_pdi *pdi)
1831 {
1832 u32 offset, val = 0;
1833
1834 if (dir == SDW_DATA_DIR_RX) {
1835 val = CDNS_PORTCTRL_DIRN;
1836
1837 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1838 val |= CDNS_PORTCTRL_TEST_FAILED;
1839 }
1840 offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET;
1841 cdns_updatel(cdns, offset,
1842 CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED,
1843 val);
1844
1845 val = pdi->num;
1846 val |= CDNS_PDI_CONFIG_SOFT_RESET;
1847 val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1);
1848 cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val);
1849 }
1850 EXPORT_SYMBOL(sdw_cdns_config_stream);
1851
1852 /**
1853 * sdw_cdns_alloc_pdi() - Allocate a PDI
1854 *
1855 * @cdns: Cadence instance
1856 * @stream: Stream to be allocated
1857 * @ch: Channel count
1858 * @dir: Data direction
1859 * @dai_id: DAI id
1860 */
sdw_cdns_alloc_pdi(struct sdw_cdns * cdns,struct sdw_cdns_streams * stream,u32 ch,u32 dir,int dai_id)1861 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns,
1862 struct sdw_cdns_streams *stream,
1863 u32 ch, u32 dir, int dai_id)
1864 {
1865 struct sdw_cdns_pdi *pdi = NULL;
1866
1867 if (dir == SDW_DATA_DIR_RX)
1868 pdi = cdns_find_pdi(cdns, stream->num_in, stream->in,
1869 dai_id);
1870 else
1871 pdi = cdns_find_pdi(cdns, stream->num_out, stream->out,
1872 dai_id);
1873
1874 /* check if we found a PDI, else find in bi-directional */
1875 if (!pdi)
1876 pdi = cdns_find_pdi(cdns, stream->num_bd, stream->bd,
1877 dai_id);
1878
1879 if (pdi) {
1880 pdi->l_ch_num = 0;
1881 pdi->h_ch_num = ch - 1;
1882 pdi->dir = dir;
1883 pdi->ch_count = ch;
1884 }
1885
1886 return pdi;
1887 }
1888 EXPORT_SYMBOL(sdw_cdns_alloc_pdi);
1889
1890 MODULE_LICENSE("Dual BSD/GPL");
1891 MODULE_DESCRIPTION("Cadence Soundwire Library");
1892