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