1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2 // Copyright(c) 2015-17 Intel Corporation.
5 * Cadence SoundWire Master module
6 * Used by Master driver
9 #include <linux/delay.h>
10 #include <linux/device.h>
11 #include <linux/debugfs.h>
12 #include <linux/interrupt.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>
23 #include "cadence_master.h"
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");
29 #define CDNS_MCP_CONFIG 0x0
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
41 #define CDNS_MCP_CONTROL 0x4
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)
53 #define CDNS_MCP_CMDCTRL 0x8
55 #define CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR BIT(2)
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)
63 #define CDNS_MCP_CONFIG_UPDATE 0x18
64 #define CDNS_MCP_CONFIG_UPDATE_BIT BIT(0)
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)
73 #define CDNS_MCP_STAT 0x40
75 #define CDNS_MCP_STAT_ACTIVE_BANK BIT(20)
76 #define CDNS_MCP_STAT_CLK_STOP BIT(16)
78 #define CDNS_MCP_INTSTAT 0x44
79 #define CDNS_MCP_INTMASK 0x48
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)
101 #define CDNS_MCP_INTSET 0x4C
103 #define CDNS_MCP_SLAVE_STAT 0x50
104 #define CDNS_MCP_SLAVE_STAT_MASK GENMASK(1, 0)
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
115 #define CDNS_MCP_SLAVE_INTMASK0 0x5C
116 #define CDNS_MCP_SLAVE_INTMASK1 0x60
118 #define CDNS_MCP_SLAVE_INTMASK0_MASK GENMASK(31, 0)
119 #define CDNS_MCP_SLAVE_INTMASK1_MASK GENMASK(15, 0)
121 #define CDNS_MCP_PORT_INTSTAT 0x64
122 #define CDNS_MCP_PDI_STAT 0x6C
124 #define CDNS_MCP_FIFOLEVEL 0x78
125 #define CDNS_MCP_FIFOSTAT 0x7C
126 #define CDNS_MCP_RX_FIFO_AVAIL GENMASK(5, 0)
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
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)
139 #define CDNS_MCP_CMD_READ 2
140 #define CDNS_MCP_CMD_WRITE 3
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)
146 #define CDNS_DP_SIZE 128
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))
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))
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)
168 #define CDNS_DPN_SAMPLE_CTRL_SI GENMASK(15, 0)
170 #define CDNS_DPN_OFFSET_CTRL_1 GENMASK(7, 0)
171 #define CDNS_DPN_OFFSET_CTRL_2 GENMASK(15, 8)
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)
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)
182 #define CDNS_PORT_OFFSET 0x80
184 #define CDNS_PDI_CONFIG(n) (0x1100 + (n) * 16)
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)
190 /* Driver defaults */
191 #define CDNS_TX_TIMEOUT 500
193 #define CDNS_SCP_RX_FIFOLEVEL 0x2
196 * register accessor helpers
198 static inline u32 cdns_readl(struct sdw_cdns *cdns, int offset)
200 return readl(cdns->registers + offset);
203 static inline void cdns_writel(struct sdw_cdns *cdns, int offset, u32 value)
205 writel(value, cdns->registers + offset);
208 static inline void cdns_updatel(struct sdw_cdns *cdns,
209 int offset, u32 mask, u32 val)
213 tmp = cdns_readl(cdns, offset);
214 tmp = (tmp & ~mask) | val;
215 cdns_writel(cdns, offset, tmp);
218 static int cdns_set_wait(struct sdw_cdns *cdns, int offset, u32 mask, u32 value)
223 /* Wait for bit to be set */
225 reg_read = readl(cdns->registers + offset);
226 if ((reg_read & mask) == value)
230 usleep_range(50, 100);
231 } while (timeout != 0);
236 static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value)
238 writel(value, cdns->registers + offset);
240 /* Wait for bit to be self cleared */
241 return cdns_set_wait(cdns, offset, value, 0);
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
248 static int cdns_config_update(struct sdw_cdns *cdns)
252 if (sdw_cdns_is_clock_stop(cdns)) {
253 dev_err(cdns->dev, "Cannot program MCP_CONFIG_UPDATE in ClockStopMode\n");
257 ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE,
258 CDNS_MCP_CONFIG_UPDATE_BIT);
260 dev_err(cdns->dev, "Config update timedout\n");
268 #ifdef CONFIG_DEBUG_FS
270 #define RD_BUF (2 * PAGE_SIZE)
272 static ssize_t cdns_sprintf(struct sdw_cdns *cdns,
273 char *buf, size_t pos, unsigned int reg)
275 return scnprintf(buf + pos, RD_BUF - pos,
276 "%4x\t%8x\n", reg, cdns_readl(cdns, reg));
279 static int cdns_reg_show(struct seq_file *s, void *data)
281 struct sdw_cdns *cdns = s->private;
287 buf = kzalloc(RD_BUF, GFP_KERNEL);
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);
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);
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);
310 ret += scnprintf(buf + ret, RD_BUF - ret,
311 "\nDPn B0 Registers\n");
313 num_ports = cdns->num_ports;
315 for (i = 0; i < num_ports; i++) {
316 ret += scnprintf(buf + ret, RD_BUF - ret,
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);
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,
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);
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);
340 ret += scnprintf(buf + ret, RD_BUF - ret,
341 "\nPDIn Config Registers\n");
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));
347 seq_printf(s, "%s", buf);
352 DEFINE_SHOW_ATTRIBUTE(cdns_reg);
354 static int cdns_hw_reset(void *data, u64 value)
356 struct sdw_cdns *cdns = data;
362 /* Userspace changed the hardware state behind the kernel's back */
363 add_taint(TAINT_USER, LOCKDEP_STILL_OK);
365 ret = sdw_cdns_exit_reset(cdns);
367 dev_dbg(cdns->dev, "link hw_reset done: %d\n", ret);
372 DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n");
374 static int cdns_parity_error_injection(void *data, u64 value)
376 struct sdw_cdns *cdns = data;
386 * Resume Master device. If this results in a bus reset, the
387 * Slave devices will re-attach and be re-enumerated.
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",
394 pm_runtime_put_noidle(bus->dev);
399 * wait long enough for Slave(s) to be in steady state. This
400 * does not need to be super precise.
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
408 mutex_lock(&bus->bus_lock);
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);
416 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
417 CDNS_MCP_CONFIG_UPDATE_BIT,
418 CDNS_MCP_CONFIG_UPDATE_BIT);
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);
424 /* program hardware to disable parity error */
425 cdns_updatel(cdns, CDNS_MCP_CMDCTRL,
426 CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR,
430 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
431 CDNS_MCP_CONFIG_UPDATE_BIT,
432 CDNS_MCP_CONFIG_UPDATE_BIT);
434 /* Continue bus operation with parity error injection disabled */
435 mutex_unlock(&bus->bus_lock);
437 /* Userspace changed the hardware state behind the kernel's back */
438 add_taint(TAINT_USER, LOCKDEP_STILL_OK);
441 * allow Master device to enter pm_runtime suspend. This may
442 * also result in Slave devices suspending.
444 pm_runtime_mark_last_busy(bus->dev);
445 pm_runtime_put_autosuspend(bus->dev);
450 DEFINE_DEBUGFS_ATTRIBUTE(cdns_parity_error_fops, NULL,
451 cdns_parity_error_injection, "%llu\n");
454 * sdw_cdns_debugfs_init() - Cadence debugfs init
455 * @cdns: Cadence instance
456 * @root: debugfs root
458 void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root)
460 debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops);
462 debugfs_create_file("cdns-hw-reset", 0200, root, cdns,
463 &cdns_hw_reset_fops);
465 debugfs_create_file("cdns-parity-error-injection", 0200, root, cdns,
466 &cdns_parity_error_fops);
468 EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init);
470 #endif /* CONFIG_DEBUG_FS */
475 static enum sdw_command_response
476 cdns_fill_msg_resp(struct sdw_cdns *cdns,
477 struct sdw_msg *msg, int count, int offset)
479 int nack = 0, no_ack = 0;
482 /* check message response */
483 for (i = 0; i < count; i++) {
484 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
486 dev_vdbg(cdns->dev, "Msg Ack not received, cmd %d\n", i);
488 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
490 dev_err_ratelimited(cdns->dev, "Msg NACK received, cmd %d\n", i);
495 dev_err_ratelimited(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num);
500 dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num);
501 return SDW_CMD_IGNORED;
505 for (i = 0; i < count; i++)
506 msg->buf[i + offset] = FIELD_GET(CDNS_MCP_RESP_RDATA, cdns->response_buf[i]);
511 static enum sdw_command_response
512 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd,
513 int offset, int count, bool defer)
519 /* Program the watermark level for RX FIFO */
520 if (cdns->msg_count != count) {
521 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count);
522 cdns->msg_count = count;
525 base = CDNS_MCP_CMD_BASE;
528 for (i = 0; i < count; i++) {
529 data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
530 data |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, cmd);
531 data |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, addr);
534 if (msg->flags == SDW_MSG_FLAG_WRITE)
535 data |= msg->buf[i + offset];
537 data |= FIELD_PREP(CDNS_MCP_CMD_SSP_TAG, msg->ssp_sync);
538 cdns_writel(cdns, base, data);
539 base += CDNS_MCP_CMD_WORD_LEN;
545 /* wait for timeout or response */
546 time = wait_for_completion_timeout(&cdns->tx_complete,
547 msecs_to_jiffies(CDNS_TX_TIMEOUT));
549 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n",
550 cmd, msg->dev_num, msg->addr, msg->len);
552 return SDW_CMD_TIMEOUT;
555 return cdns_fill_msg_resp(cdns, msg, count, offset);
558 static enum sdw_command_response
559 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg)
561 int nack = 0, no_ack = 0;
566 /* Program the watermark level for RX FIFO */
567 if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) {
568 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL);
569 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL;
572 data[0] = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
573 data[0] |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, 0x3);
576 data[0] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE1);
577 data[1] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE2);
579 data[0] |= msg->addr_page1;
580 data[1] |= msg->addr_page2;
582 base = CDNS_MCP_CMD_BASE;
583 cdns_writel(cdns, base, data[0]);
584 base += CDNS_MCP_CMD_WORD_LEN;
585 cdns_writel(cdns, base, data[1]);
587 time = wait_for_completion_timeout(&cdns->tx_complete,
588 msecs_to_jiffies(CDNS_TX_TIMEOUT));
590 dev_err(cdns->dev, "SCP Msg trf timed out\n");
592 return SDW_CMD_TIMEOUT;
595 /* check response the writes */
596 for (i = 0; i < 2; i++) {
597 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
599 dev_err(cdns->dev, "Program SCP Ack not received\n");
600 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
602 dev_err(cdns->dev, "Program SCP NACK received\n");
607 /* For NACK, NO ack, don't return err if we are in Broadcast mode */
609 dev_err_ratelimited(cdns->dev,
610 "SCP_addrpage NACKed for Slave %d\n", msg->dev_num);
615 dev_dbg_ratelimited(cdns->dev,
616 "SCP_addrpage ignored for Slave %d\n", msg->dev_num);
617 return SDW_CMD_IGNORED;
623 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd)
628 ret = cdns_program_scp_addr(cdns, msg);
635 switch (msg->flags) {
636 case SDW_MSG_FLAG_READ:
637 *cmd = CDNS_MCP_CMD_READ;
640 case SDW_MSG_FLAG_WRITE:
641 *cmd = CDNS_MCP_CMD_WRITE;
645 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags);
652 enum sdw_command_response
653 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg)
655 struct sdw_cdns *cdns = bus_to_cdns(bus);
658 ret = cdns_prep_msg(cdns, msg, &cmd);
660 return SDW_CMD_FAIL_OTHER;
662 for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) {
663 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
664 CDNS_MCP_CMD_LEN, false);
669 if (!(msg->len % CDNS_MCP_CMD_LEN))
672 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
673 msg->len % CDNS_MCP_CMD_LEN, false);
678 EXPORT_SYMBOL(cdns_xfer_msg);
680 enum sdw_command_response
681 cdns_xfer_msg_defer(struct sdw_bus *bus,
682 struct sdw_msg *msg, struct sdw_defer *defer)
684 struct sdw_cdns *cdns = bus_to_cdns(bus);
687 /* for defer only 1 message is supported */
691 ret = cdns_prep_msg(cdns, msg, &cmd);
693 return SDW_CMD_FAIL_OTHER;
696 cdns->defer->length = msg->len;
698 return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true);
700 EXPORT_SYMBOL(cdns_xfer_msg_defer);
702 enum sdw_command_response
703 cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num)
705 struct sdw_cdns *cdns = bus_to_cdns(bus);
708 /* Create dummy message with valid device number */
709 memset(&msg, 0, sizeof(msg));
710 msg.dev_num = dev_num;
712 return cdns_program_scp_addr(cdns, &msg);
714 EXPORT_SYMBOL(cdns_reset_page_addr);
720 static void cdns_read_response(struct sdw_cdns *cdns)
722 u32 num_resp, cmd_base;
725 num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT);
726 num_resp &= CDNS_MCP_RX_FIFO_AVAIL;
728 cmd_base = CDNS_MCP_CMD_BASE;
730 for (i = 0; i < num_resp; i++) {
731 cdns->response_buf[i] = cdns_readl(cdns, cmd_base);
732 cmd_base += CDNS_MCP_CMD_WORD_LEN;
736 static int cdns_update_slave_status(struct sdw_cdns *cdns,
739 enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
740 bool is_slave = false;
744 memset(status, 0, sizeof(status));
746 for (i = 0; i <= SDW_MAX_DEVICES; i++) {
747 mask = (slave_intstat >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) &
748 CDNS_MCP_SLAVE_STATUS_BITS;
755 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) {
756 status[i] = SDW_SLAVE_RESERVED;
760 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) {
761 status[i] = SDW_SLAVE_ATTACHED;
765 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) {
766 status[i] = SDW_SLAVE_ALERT;
770 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) {
771 status[i] = SDW_SLAVE_UNATTACHED;
775 /* first check if Slave reported multiple status */
776 if (set_status > 1) {
779 dev_warn_ratelimited(cdns->dev,
780 "Slave %d reported multiple Status: %d\n",
783 /* check latest status extracted from PING commands */
784 val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
789 status[i] = SDW_SLAVE_UNATTACHED;
792 status[i] = SDW_SLAVE_ATTACHED;
795 status[i] = SDW_SLAVE_ALERT;
799 status[i] = SDW_SLAVE_RESERVED;
803 dev_warn_ratelimited(cdns->dev,
804 "Slave %d status updated to %d\n",
811 return sdw_handle_slave_status(&cdns->bus, status);
817 * sdw_cdns_irq() - Cadence interrupt handler
819 * @dev_id: irq context
821 irqreturn_t sdw_cdns_irq(int irq, void *dev_id)
823 struct sdw_cdns *cdns = dev_id;
825 int ret = IRQ_HANDLED;
827 /* Check if the link is up */
831 int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT);
833 /* check for reserved values read as zero */
834 if (int_status & CDNS_MCP_INT_RESERVED)
837 if (!(int_status & CDNS_MCP_INT_IRQ))
840 if (int_status & CDNS_MCP_INT_RX_WL) {
841 cdns_read_response(cdns);
844 cdns_fill_msg_resp(cdns, cdns->defer->msg,
845 cdns->defer->length, 0);
846 complete(&cdns->defer->complete);
849 complete(&cdns->tx_complete);
853 if (int_status & CDNS_MCP_INT_PARITY) {
854 /* Parity error detected by Master */
855 dev_err_ratelimited(cdns->dev, "Parity error\n");
858 if (int_status & CDNS_MCP_INT_CTRL_CLASH) {
859 /* Slave is driving bit slot during control word */
860 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n");
863 if (int_status & CDNS_MCP_INT_DATA_CLASH) {
865 * Multiple slaves trying to drive bit slot, or issue with
866 * ownership of data bits or Slave gone bonkers
868 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n");
871 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL &&
872 int_status & CDNS_MCP_INT_DPINT) {
875 /* just log which ports report an error */
876 port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT);
877 dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n",
880 /* clear status w/ write1 */
881 cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat);
884 if (int_status & CDNS_MCP_INT_SLAVE_MASK) {
885 /* Mask the Slave interrupt and wake thread */
886 cdns_updatel(cdns, CDNS_MCP_INTMASK,
887 CDNS_MCP_INT_SLAVE_MASK, 0);
889 int_status &= ~CDNS_MCP_INT_SLAVE_MASK;
892 * Deal with possible race condition between interrupt
893 * handling and disabling interrupts on suspend.
895 * If the master is in the process of disabling
896 * interrupts, don't schedule a workqueue
898 if (cdns->interrupt_enabled)
899 schedule_work(&cdns->work);
902 cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status);
905 EXPORT_SYMBOL(sdw_cdns_irq);
908 * To update slave status in a work since we will need to handle
909 * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave
911 * @work: cdns worker thread
913 static void cdns_update_slave_status_work(struct work_struct *work)
915 struct sdw_cdns *cdns =
916 container_of(work, struct sdw_cdns, work);
920 slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
921 slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
923 /* combine the two status */
924 slave_intstat = ((u64)slave1 << 32) | slave0;
926 dev_dbg_ratelimited(cdns->dev, "Slave status change: 0x%llx\n", slave_intstat);
928 cdns_update_slave_status(cdns, slave_intstat);
929 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0);
930 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1);
932 /* clear and unmask Slave interrupt now */
933 cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK);
934 cdns_updatel(cdns, CDNS_MCP_INTMASK,
935 CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);
944 * sdw_cdns_exit_reset() - Program reset parameters and start bus operations
945 * @cdns: Cadence instance
947 int sdw_cdns_exit_reset(struct sdw_cdns *cdns)
949 /* program maximum length reset to be safe */
950 cdns_updatel(cdns, CDNS_MCP_CONTROL,
951 CDNS_MCP_CONTROL_RST_DELAY,
952 CDNS_MCP_CONTROL_RST_DELAY);
954 /* use hardware generated reset */
955 cdns_updatel(cdns, CDNS_MCP_CONTROL,
956 CDNS_MCP_CONTROL_HW_RST,
957 CDNS_MCP_CONTROL_HW_RST);
960 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
961 CDNS_MCP_CONFIG_UPDATE_BIT,
962 CDNS_MCP_CONFIG_UPDATE_BIT);
964 /* don't wait here */
968 EXPORT_SYMBOL(sdw_cdns_exit_reset);
971 * sdw_cdns_enable_slave_interrupt() - Enable SDW slave interrupts
972 * @cdns: Cadence instance
973 * @state: boolean for true/false
975 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state)
979 mask = cdns_readl(cdns, CDNS_MCP_INTMASK);
981 mask |= CDNS_MCP_INT_SLAVE_MASK;
983 mask &= ~CDNS_MCP_INT_SLAVE_MASK;
985 cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
989 * sdw_cdns_enable_interrupt() - Enable SDW interrupts
990 * @cdns: Cadence instance
991 * @state: True if we are trying to enable interrupt.
993 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)
995 u32 slave_intmask0 = 0;
996 u32 slave_intmask1 = 0;
1002 slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK;
1003 slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK;
1005 /* enable detection of all slave state changes */
1006 mask = CDNS_MCP_INT_SLAVE_MASK;
1008 /* enable detection of bus issues */
1009 mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
1010 CDNS_MCP_INT_PARITY;
1012 /* port interrupt limited to test modes for now */
1013 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1014 mask |= CDNS_MCP_INT_DPINT;
1016 /* enable detection of RX fifo level */
1017 mask |= CDNS_MCP_INT_RX_WL;
1020 * CDNS_MCP_INT_IRQ needs to be set otherwise all previous
1021 * settings are irrelevant
1023 mask |= CDNS_MCP_INT_IRQ;
1025 if (interrupt_mask) /* parameter override */
1026 mask = interrupt_mask;
1029 /* clear slave interrupt status before enabling interrupt */
1033 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
1034 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state);
1035 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
1036 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state);
1038 cdns->interrupt_enabled = state;
1041 * Complete any on-going status updates before updating masks,
1042 * and cancel queued status updates.
1044 * There could be a race with a new interrupt thrown before
1045 * the 3 mask updates below are complete, so in the interrupt
1046 * we use the 'interrupt_enabled' status to prevent new work
1047 * from being queued.
1050 cancel_work_sync(&cdns->work);
1052 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0);
1053 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1);
1054 cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
1058 EXPORT_SYMBOL(sdw_cdns_enable_interrupt);
1060 static int cdns_allocate_pdi(struct sdw_cdns *cdns,
1061 struct sdw_cdns_pdi **stream,
1062 u32 num, u32 pdi_offset)
1064 struct sdw_cdns_pdi *pdi;
1070 pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL);
1074 for (i = 0; i < num; i++) {
1075 pdi[i].num = i + pdi_offset;
1083 * sdw_cdns_pdi_init() - PDI initialization routine
1085 * @cdns: Cadence instance
1086 * @config: Stream configurations
1088 int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
1089 struct sdw_cdns_stream_config config)
1091 struct sdw_cdns_streams *stream;
1095 cdns->pcm.num_bd = config.pcm_bd;
1096 cdns->pcm.num_in = config.pcm_in;
1097 cdns->pcm.num_out = config.pcm_out;
1098 cdns->pdm.num_bd = config.pdm_bd;
1099 cdns->pdm.num_in = config.pdm_in;
1100 cdns->pdm.num_out = config.pdm_out;
1102 /* Allocate PDIs for PCMs */
1103 stream = &cdns->pcm;
1105 /* we allocate PDI0 and PDI1 which are used for Bulk */
1108 ret = cdns_allocate_pdi(cdns, &stream->bd,
1109 stream->num_bd, offset);
1113 offset += stream->num_bd;
1115 ret = cdns_allocate_pdi(cdns, &stream->in,
1116 stream->num_in, offset);
1120 offset += stream->num_in;
1122 ret = cdns_allocate_pdi(cdns, &stream->out,
1123 stream->num_out, offset);
1127 /* Update total number of PCM PDIs */
1128 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1129 cdns->num_ports = stream->num_pdi;
1131 /* Allocate PDIs for PDMs */
1132 stream = &cdns->pdm;
1133 ret = cdns_allocate_pdi(cdns, &stream->bd,
1134 stream->num_bd, offset);
1138 offset += stream->num_bd;
1140 ret = cdns_allocate_pdi(cdns, &stream->in,
1141 stream->num_in, offset);
1145 offset += stream->num_in;
1147 ret = cdns_allocate_pdi(cdns, &stream->out,
1148 stream->num_out, offset);
1153 /* Update total number of PDM PDIs */
1154 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1155 cdns->num_ports += stream->num_pdi;
1159 EXPORT_SYMBOL(sdw_cdns_pdi_init);
1161 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
1167 r = sdw_find_row_index(n_rows);
1168 c = sdw_find_col_index(n_cols);
1170 val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r);
1171 val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c);
1176 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
1178 struct sdw_bus *bus = &cdns->bus;
1179 struct sdw_master_prop *prop = &bus->prop;
1184 /* Set clock divider */
1185 divider = (prop->mclk_freq / prop->max_clk_freq) - 1;
1187 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0,
1188 CDNS_MCP_CLK_MCLKD_MASK, divider);
1189 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1,
1190 CDNS_MCP_CLK_MCLKD_MASK, divider);
1193 * Frame shape changes after initialization have to be done
1194 * with the bank switch mechanism
1196 val = cdns_set_initial_frame_shape(prop->default_row,
1198 cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val);
1200 /* Set SSP interval to default value */
1201 ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ;
1202 cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval);
1203 cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval);
1207 * sdw_cdns_init() - Cadence initialization
1208 * @cdns: Cadence instance
1210 int sdw_cdns_init(struct sdw_cdns *cdns)
1214 cdns_init_clock_ctrl(cdns);
1216 /* reset msg_count to default value of FIFOLEVEL */
1217 cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL);
1219 /* flush command FIFOs */
1220 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST,
1221 CDNS_MCP_CONTROL_CMD_RST);
1223 /* Set cmd accept mode */
1224 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
1225 CDNS_MCP_CONTROL_CMD_ACCEPT);
1227 /* Configure mcp config */
1228 val = cdns_readl(cdns, CDNS_MCP_CONFIG);
1230 /* enable bus operations with clock and data */
1231 val &= ~CDNS_MCP_CONFIG_OP;
1232 val |= CDNS_MCP_CONFIG_OP_NORMAL;
1234 /* Set cmd mode for Tx and Rx cmds */
1235 val &= ~CDNS_MCP_CONFIG_CMD;
1237 /* Disable sniffer mode */
1238 val &= ~CDNS_MCP_CONFIG_SNIFFER;
1240 /* Disable auto bus release */
1241 val &= ~CDNS_MCP_CONFIG_BUS_REL;
1243 if (cdns->bus.multi_link)
1244 /* Set Multi-master mode to take gsync into account */
1245 val |= CDNS_MCP_CONFIG_MMASTER;
1247 /* leave frame delay to hardware default of 0x1F */
1249 /* leave command retry to hardware default of 0 */
1251 cdns_writel(cdns, CDNS_MCP_CONFIG, val);
1253 /* changes will be committed later */
1256 EXPORT_SYMBOL(sdw_cdns_init);
1258 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params)
1260 struct sdw_master_prop *prop = &bus->prop;
1261 struct sdw_cdns *cdns = bus_to_cdns(bus);
1262 int mcp_clkctrl_off;
1265 if (!params->curr_dr_freq) {
1266 dev_err(cdns->dev, "NULL curr_dr_freq\n");
1270 divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR /
1271 params->curr_dr_freq;
1272 divider--; /* divider is 1/(N+1) */
1274 if (params->next_bank)
1275 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1;
1277 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0;
1279 cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider);
1283 EXPORT_SYMBOL(cdns_bus_conf);
1285 static int cdns_port_params(struct sdw_bus *bus,
1286 struct sdw_port_params *p_params, unsigned int bank)
1288 struct sdw_cdns *cdns = bus_to_cdns(bus);
1289 int dpn_config = 0, dpn_config_off;
1292 dpn_config_off = CDNS_DPN_B1_CONFIG(p_params->num);
1294 dpn_config_off = CDNS_DPN_B0_CONFIG(p_params->num);
1296 dpn_config = cdns_readl(cdns, dpn_config_off);
1298 u32p_replace_bits(&dpn_config, (p_params->bps - 1), CDNS_DPN_CONFIG_WL);
1299 u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW);
1300 u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT);
1302 cdns_writel(cdns, dpn_config_off, dpn_config);
1307 static int cdns_transport_params(struct sdw_bus *bus,
1308 struct sdw_transport_params *t_params,
1309 enum sdw_reg_bank bank)
1311 struct sdw_cdns *cdns = bus_to_cdns(bus);
1312 int dpn_offsetctrl = 0, dpn_offsetctrl_off;
1313 int dpn_config = 0, dpn_config_off;
1314 int dpn_hctrl = 0, dpn_hctrl_off;
1315 int num = t_params->port_num;
1316 int dpn_samplectrl_off;
1319 * Note: Only full data port is supported on the Master side for
1320 * both PCM and PDM ports.
1324 dpn_config_off = CDNS_DPN_B1_CONFIG(num);
1325 dpn_samplectrl_off = CDNS_DPN_B1_SAMPLE_CTRL(num);
1326 dpn_hctrl_off = CDNS_DPN_B1_HCTRL(num);
1327 dpn_offsetctrl_off = CDNS_DPN_B1_OFFSET_CTRL(num);
1329 dpn_config_off = CDNS_DPN_B0_CONFIG(num);
1330 dpn_samplectrl_off = CDNS_DPN_B0_SAMPLE_CTRL(num);
1331 dpn_hctrl_off = CDNS_DPN_B0_HCTRL(num);
1332 dpn_offsetctrl_off = CDNS_DPN_B0_OFFSET_CTRL(num);
1335 dpn_config = cdns_readl(cdns, dpn_config_off);
1336 u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC);
1337 u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM);
1338 cdns_writel(cdns, dpn_config_off, dpn_config);
1340 u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1);
1341 u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2);
1342 cdns_writel(cdns, dpn_offsetctrl_off, dpn_offsetctrl);
1344 u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART);
1345 u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP);
1346 u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL);
1348 cdns_writel(cdns, dpn_hctrl_off, dpn_hctrl);
1349 cdns_writel(cdns, dpn_samplectrl_off, (t_params->sample_interval - 1));
1354 static int cdns_port_enable(struct sdw_bus *bus,
1355 struct sdw_enable_ch *enable_ch, unsigned int bank)
1357 struct sdw_cdns *cdns = bus_to_cdns(bus);
1358 int dpn_chnen_off, ch_mask;
1361 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num);
1363 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num);
1365 ch_mask = enable_ch->ch_mask * enable_ch->enable;
1366 cdns_writel(cdns, dpn_chnen_off, ch_mask);
1371 static const struct sdw_master_port_ops cdns_port_ops = {
1372 .dpn_set_port_params = cdns_port_params,
1373 .dpn_set_port_transport_params = cdns_transport_params,
1374 .dpn_port_enable_ch = cdns_port_enable,
1378 * sdw_cdns_is_clock_stop: Check clock status
1380 * @cdns: Cadence instance
1382 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns)
1384 return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP);
1386 EXPORT_SYMBOL(sdw_cdns_is_clock_stop);
1389 * sdw_cdns_clock_stop: Cadence clock stop configuration routine
1391 * @cdns: Cadence instance
1392 * @block_wake: prevent wakes if required by the platform
1394 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake)
1396 bool slave_present = false;
1397 struct sdw_slave *slave;
1400 /* Check suspend status */
1401 if (sdw_cdns_is_clock_stop(cdns)) {
1402 dev_dbg(cdns->dev, "Clock is already stopped\n");
1407 * Before entering clock stop we mask the Slave
1408 * interrupts. This helps avoid having to deal with e.g. a
1409 * Slave becoming UNATTACHED while the clock is being stopped
1411 cdns_enable_slave_interrupts(cdns, false);
1414 * For specific platforms, it is required to be able to put
1415 * master into a state in which it ignores wake-up trials
1416 * in clock stop state
1419 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1420 CDNS_MCP_CONTROL_BLOCK_WAKEUP,
1421 CDNS_MCP_CONTROL_BLOCK_WAKEUP);
1423 list_for_each_entry(slave, &cdns->bus.slaves, node) {
1424 if (slave->status == SDW_SLAVE_ATTACHED ||
1425 slave->status == SDW_SLAVE_ALERT) {
1426 slave_present = true;
1432 * This CMD_ACCEPT should be used when there are no devices
1433 * attached on the link when entering clock stop mode. If this is
1434 * not set and there is a broadcast write then the command ignored
1435 * will be treated as a failure
1438 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1439 CDNS_MCP_CONTROL_CMD_ACCEPT,
1440 CDNS_MCP_CONTROL_CMD_ACCEPT);
1442 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1443 CDNS_MCP_CONTROL_CMD_ACCEPT, 0);
1445 /* commit changes */
1446 ret = cdns_config_update(cdns);
1448 dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1452 /* Prepare slaves for clock stop */
1453 ret = sdw_bus_prep_clk_stop(&cdns->bus);
1455 dev_err(cdns->dev, "prepare clock stop failed %d", ret);
1460 * Enter clock stop mode and only report errors if there are
1461 * Slave devices present (ALERT or ATTACHED)
1463 ret = sdw_bus_clk_stop(&cdns->bus);
1464 if (ret < 0 && slave_present && ret != -ENODATA) {
1465 dev_err(cdns->dev, "bus clock stop failed %d", ret);
1469 ret = cdns_set_wait(cdns, CDNS_MCP_STAT,
1470 CDNS_MCP_STAT_CLK_STOP,
1471 CDNS_MCP_STAT_CLK_STOP);
1473 dev_err(cdns->dev, "Clock stop failed %d\n", ret);
1477 EXPORT_SYMBOL(sdw_cdns_clock_stop);
1480 * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine
1482 * @cdns: Cadence instance
1483 * @bus_reset: context may be lost while in low power modes and the bus
1484 * may require a Severe Reset and re-enumeration after a wake.
1486 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset)
1490 /* unmask Slave interrupts that were masked when stopping the clock */
1491 cdns_enable_slave_interrupts(cdns, true);
1493 ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,
1494 CDNS_MCP_CONTROL_CLK_STOP_CLR);
1496 dev_err(cdns->dev, "Couldn't exit from clock stop\n");
1500 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0);
1502 dev_err(cdns->dev, "clock stop exit failed %d\n", ret);
1506 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1507 CDNS_MCP_CONTROL_BLOCK_WAKEUP, 0);
1510 * clear CMD_ACCEPT so that the command ignored
1511 * will be treated as a failure during a broadcast write
1513 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT, 0);
1517 /* enable bus operations with clock and data */
1518 cdns_updatel(cdns, CDNS_MCP_CONFIG,
1520 CDNS_MCP_CONFIG_OP_NORMAL);
1522 ret = cdns_config_update(cdns);
1524 dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1528 ret = sdw_bus_exit_clk_stop(&cdns->bus);
1530 dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret);
1535 EXPORT_SYMBOL(sdw_cdns_clock_restart);
1538 * sdw_cdns_probe() - Cadence probe routine
1539 * @cdns: Cadence instance
1541 int sdw_cdns_probe(struct sdw_cdns *cdns)
1543 init_completion(&cdns->tx_complete);
1544 cdns->bus.port_ops = &cdns_port_ops;
1546 INIT_WORK(&cdns->work, cdns_update_slave_status_work);
1549 EXPORT_SYMBOL(sdw_cdns_probe);
1551 int cdns_set_sdw_stream(struct snd_soc_dai *dai,
1552 void *stream, bool pcm, int direction)
1554 struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
1555 struct sdw_cdns_dma_data *dma;
1558 /* first paranoia check */
1559 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1560 dma = dai->playback_dma_data;
1562 dma = dai->capture_dma_data;
1566 "dma_data already allocated for dai %s\n",
1571 /* allocate and set dma info */
1572 dma = kzalloc(sizeof(*dma), GFP_KERNEL);
1577 dma->stream_type = SDW_STREAM_PCM;
1579 dma->stream_type = SDW_STREAM_PDM;
1581 dma->bus = &cdns->bus;
1582 dma->link_id = cdns->instance;
1584 dma->stream = stream;
1586 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1587 dai->playback_dma_data = dma;
1589 dai->capture_dma_data = dma;
1591 /* for NULL stream we release allocated dma_data */
1592 if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
1593 kfree(dai->playback_dma_data);
1594 dai->playback_dma_data = NULL;
1596 kfree(dai->capture_dma_data);
1597 dai->capture_dma_data = NULL;
1602 EXPORT_SYMBOL(cdns_set_sdw_stream);
1605 * cdns_find_pdi() - Find a free PDI
1607 * @cdns: Cadence instance
1608 * @offset: Starting offset
1609 * @num: Number of PDIs
1610 * @pdi: PDI instances
1613 * Find a PDI for a given PDI array. The PDI num and dai_id are
1614 * expected to match, return NULL otherwise.
1616 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns,
1617 unsigned int offset,
1619 struct sdw_cdns_pdi *pdi,
1624 for (i = offset; i < offset + num; i++)
1625 if (pdi[i].num == dai_id)
1632 * sdw_cdns_config_stream: Configure a stream
1634 * @cdns: Cadence instance
1635 * @ch: Channel count
1636 * @dir: Data direction
1637 * @pdi: PDI to be used
1639 void sdw_cdns_config_stream(struct sdw_cdns *cdns,
1640 u32 ch, u32 dir, struct sdw_cdns_pdi *pdi)
1642 u32 offset, val = 0;
1644 if (dir == SDW_DATA_DIR_RX) {
1645 val = CDNS_PORTCTRL_DIRN;
1647 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1648 val |= CDNS_PORTCTRL_TEST_FAILED;
1650 offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET;
1651 cdns_updatel(cdns, offset,
1652 CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED,
1656 val |= CDNS_PDI_CONFIG_SOFT_RESET;
1657 val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1);
1658 cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val);
1660 EXPORT_SYMBOL(sdw_cdns_config_stream);
1663 * sdw_cdns_alloc_pdi() - Allocate a PDI
1665 * @cdns: Cadence instance
1666 * @stream: Stream to be allocated
1667 * @ch: Channel count
1668 * @dir: Data direction
1671 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns,
1672 struct sdw_cdns_streams *stream,
1673 u32 ch, u32 dir, int dai_id)
1675 struct sdw_cdns_pdi *pdi = NULL;
1677 if (dir == SDW_DATA_DIR_RX)
1678 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in,
1681 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out,
1684 /* check if we found a PDI, else find in bi-directional */
1686 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd,
1691 pdi->h_ch_num = ch - 1;
1698 EXPORT_SYMBOL(sdw_cdns_alloc_pdi);
1700 MODULE_LICENSE("Dual BSD/GPL");
1701 MODULE_DESCRIPTION("Cadence Soundwire Library");