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