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_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",
398 * wait long enough for Slave(s) to be in steady state. This
399 * does not need to be super precise.
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
407 mutex_lock(&bus->bus_lock);
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);
415 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
416 CDNS_MCP_CONFIG_UPDATE_BIT,
417 CDNS_MCP_CONFIG_UPDATE_BIT);
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);
423 /* program hardware to disable parity error */
424 cdns_updatel(cdns, CDNS_MCP_CMDCTRL,
425 CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR,
429 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
430 CDNS_MCP_CONFIG_UPDATE_BIT,
431 CDNS_MCP_CONFIG_UPDATE_BIT);
433 /* Continue bus operation with parity error injection disabled */
434 mutex_unlock(&bus->bus_lock);
436 /* Userspace changed the hardware state behind the kernel's back */
437 add_taint(TAINT_USER, LOCKDEP_STILL_OK);
440 * allow Master device to enter pm_runtime suspend. This may
441 * also result in Slave devices suspending.
443 pm_runtime_mark_last_busy(bus->dev);
444 pm_runtime_put_autosuspend(bus->dev);
449 DEFINE_DEBUGFS_ATTRIBUTE(cdns_parity_error_fops, NULL,
450 cdns_parity_error_injection, "%llu\n");
452 static int cdns_set_pdi_loopback_source(void *data, u64 value)
454 struct sdw_cdns *cdns = data;
455 unsigned int pdi_out_num = cdns->pcm.num_bd + cdns->pcm.num_out;
457 if (value > pdi_out_num)
460 /* Userspace changed the hardware state behind the kernel's back */
461 add_taint(TAINT_USER, LOCKDEP_STILL_OK);
463 cdns->pdi_loopback_source = value;
467 DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_source_fops, NULL, cdns_set_pdi_loopback_source, "%llu\n");
469 static int cdns_set_pdi_loopback_target(void *data, u64 value)
471 struct sdw_cdns *cdns = data;
472 unsigned int pdi_in_num = cdns->pcm.num_bd + cdns->pcm.num_in;
474 if (value > pdi_in_num)
477 /* Userspace changed the hardware state behind the kernel's back */
478 add_taint(TAINT_USER, LOCKDEP_STILL_OK);
480 cdns->pdi_loopback_target = value;
484 DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_target_fops, NULL, cdns_set_pdi_loopback_target, "%llu\n");
487 * sdw_cdns_debugfs_init() - Cadence debugfs init
488 * @cdns: Cadence instance
489 * @root: debugfs root
491 void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root)
493 debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops);
495 debugfs_create_file("cdns-hw-reset", 0200, root, cdns,
496 &cdns_hw_reset_fops);
498 debugfs_create_file("cdns-parity-error-injection", 0200, root, cdns,
499 &cdns_parity_error_fops);
501 cdns->pdi_loopback_source = -1;
502 cdns->pdi_loopback_target = -1;
504 debugfs_create_file("cdns-pdi-loopback-source", 0200, root, cdns,
505 &cdns_pdi_loopback_source_fops);
507 debugfs_create_file("cdns-pdi-loopback-target", 0200, root, cdns,
508 &cdns_pdi_loopback_target_fops);
511 EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init);
513 #endif /* CONFIG_DEBUG_FS */
518 static enum sdw_command_response
519 cdns_fill_msg_resp(struct sdw_cdns *cdns,
520 struct sdw_msg *msg, int count, int offset)
522 int nack = 0, no_ack = 0;
525 /* check message response */
526 for (i = 0; i < count; i++) {
527 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
529 dev_vdbg(cdns->dev, "Msg Ack not received, cmd %d\n", i);
531 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
533 dev_err_ratelimited(cdns->dev, "Msg NACK received, cmd %d\n", i);
538 dev_err_ratelimited(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num);
543 dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num);
544 return SDW_CMD_IGNORED;
547 if (msg->flags == SDW_MSG_FLAG_READ) {
549 for (i = 0; i < count; i++)
550 msg->buf[i + offset] = FIELD_GET(CDNS_MCP_RESP_RDATA,
551 cdns->response_buf[i]);
557 static enum sdw_command_response
558 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd,
559 int offset, int count, bool defer)
565 /* Program the watermark level for RX FIFO */
566 if (cdns->msg_count != count) {
567 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count);
568 cdns->msg_count = count;
571 base = CDNS_MCP_CMD_BASE;
572 addr = msg->addr + offset;
574 for (i = 0; i < count; i++) {
575 data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
576 data |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, cmd);
577 data |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, addr);
580 if (msg->flags == SDW_MSG_FLAG_WRITE)
581 data |= msg->buf[i + offset];
583 data |= FIELD_PREP(CDNS_MCP_CMD_SSP_TAG, msg->ssp_sync);
584 cdns_writel(cdns, base, data);
585 base += CDNS_MCP_CMD_WORD_LEN;
591 /* wait for timeout or response */
592 time = wait_for_completion_timeout(&cdns->tx_complete,
593 msecs_to_jiffies(CDNS_TX_TIMEOUT));
595 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n",
596 cmd, msg->dev_num, msg->addr, msg->len);
598 return SDW_CMD_TIMEOUT;
601 return cdns_fill_msg_resp(cdns, msg, count, offset);
604 static enum sdw_command_response
605 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg)
607 int nack = 0, no_ack = 0;
612 /* Program the watermark level for RX FIFO */
613 if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) {
614 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL);
615 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL;
618 data[0] = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
619 data[0] |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, 0x3);
622 data[0] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE1);
623 data[1] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE2);
625 data[0] |= msg->addr_page1;
626 data[1] |= msg->addr_page2;
628 base = CDNS_MCP_CMD_BASE;
629 cdns_writel(cdns, base, data[0]);
630 base += CDNS_MCP_CMD_WORD_LEN;
631 cdns_writel(cdns, base, data[1]);
633 time = wait_for_completion_timeout(&cdns->tx_complete,
634 msecs_to_jiffies(CDNS_TX_TIMEOUT));
636 dev_err(cdns->dev, "SCP Msg trf timed out\n");
638 return SDW_CMD_TIMEOUT;
641 /* check response the writes */
642 for (i = 0; i < 2; i++) {
643 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
645 dev_err(cdns->dev, "Program SCP Ack not received\n");
646 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
648 dev_err(cdns->dev, "Program SCP NACK received\n");
653 /* For NACK, NO ack, don't return err if we are in Broadcast mode */
655 dev_err_ratelimited(cdns->dev,
656 "SCP_addrpage NACKed for Slave %d\n", msg->dev_num);
661 dev_dbg_ratelimited(cdns->dev,
662 "SCP_addrpage ignored for Slave %d\n", msg->dev_num);
663 return SDW_CMD_IGNORED;
669 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd)
674 ret = cdns_program_scp_addr(cdns, msg);
681 switch (msg->flags) {
682 case SDW_MSG_FLAG_READ:
683 *cmd = CDNS_MCP_CMD_READ;
686 case SDW_MSG_FLAG_WRITE:
687 *cmd = CDNS_MCP_CMD_WRITE;
691 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags);
698 enum sdw_command_response
699 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg)
701 struct sdw_cdns *cdns = bus_to_cdns(bus);
704 ret = cdns_prep_msg(cdns, msg, &cmd);
706 return SDW_CMD_FAIL_OTHER;
708 for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) {
709 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
710 CDNS_MCP_CMD_LEN, false);
711 if (ret != SDW_CMD_OK)
715 if (!(msg->len % CDNS_MCP_CMD_LEN))
718 return _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
719 msg->len % CDNS_MCP_CMD_LEN, false);
721 EXPORT_SYMBOL(cdns_xfer_msg);
723 enum sdw_command_response
724 cdns_xfer_msg_defer(struct sdw_bus *bus,
725 struct sdw_msg *msg, struct sdw_defer *defer)
727 struct sdw_cdns *cdns = bus_to_cdns(bus);
730 /* for defer only 1 message is supported */
734 ret = cdns_prep_msg(cdns, msg, &cmd);
736 return SDW_CMD_FAIL_OTHER;
739 cdns->defer->length = msg->len;
741 return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true);
743 EXPORT_SYMBOL(cdns_xfer_msg_defer);
745 enum sdw_command_response
746 cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num)
748 struct sdw_cdns *cdns = bus_to_cdns(bus);
751 /* Create dummy message with valid device number */
752 memset(&msg, 0, sizeof(msg));
753 msg.dev_num = dev_num;
755 return cdns_program_scp_addr(cdns, &msg);
757 EXPORT_SYMBOL(cdns_reset_page_addr);
759 u32 cdns_read_ping_status(struct sdw_bus *bus)
761 struct sdw_cdns *cdns = bus_to_cdns(bus);
763 return cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
765 EXPORT_SYMBOL(cdns_read_ping_status);
771 static void cdns_read_response(struct sdw_cdns *cdns)
773 u32 num_resp, cmd_base;
776 num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT);
777 num_resp &= CDNS_MCP_RX_FIFO_AVAIL;
779 cmd_base = CDNS_MCP_CMD_BASE;
781 for (i = 0; i < num_resp; i++) {
782 cdns->response_buf[i] = cdns_readl(cdns, cmd_base);
783 cmd_base += CDNS_MCP_CMD_WORD_LEN;
787 static int cdns_update_slave_status(struct sdw_cdns *cdns,
790 enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
791 bool is_slave = false;
796 memset(status, 0, sizeof(status));
798 for (i = 0; i <= SDW_MAX_DEVICES; i++) {
799 mask = (slave_intstat >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) &
800 CDNS_MCP_SLAVE_STATUS_BITS;
807 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) {
808 status[i] = SDW_SLAVE_RESERVED;
812 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) {
813 status[i] = SDW_SLAVE_ATTACHED;
817 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) {
818 status[i] = SDW_SLAVE_ALERT;
822 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) {
823 status[i] = SDW_SLAVE_UNATTACHED;
829 * check that there was a single reported Slave status and when
830 * there is not use the latest status extracted from PING commands
832 if (set_status != 1) {
833 val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
838 status[i] = SDW_SLAVE_UNATTACHED;
841 status[i] = SDW_SLAVE_ATTACHED;
844 status[i] = SDW_SLAVE_ALERT;
848 status[i] = SDW_SLAVE_RESERVED;
855 return sdw_handle_slave_status(&cdns->bus, status);
861 * sdw_cdns_irq() - Cadence interrupt handler
863 * @dev_id: irq context
865 irqreturn_t sdw_cdns_irq(int irq, void *dev_id)
867 struct sdw_cdns *cdns = dev_id;
870 /* Check if the link is up */
874 int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT);
876 /* check for reserved values read as zero */
877 if (int_status & CDNS_MCP_INT_RESERVED)
880 if (!(int_status & CDNS_MCP_INT_IRQ))
883 if (int_status & CDNS_MCP_INT_RX_WL) {
884 cdns_read_response(cdns);
887 cdns_fill_msg_resp(cdns, cdns->defer->msg,
888 cdns->defer->length, 0);
889 complete(&cdns->defer->complete);
892 complete(&cdns->tx_complete);
896 if (int_status & CDNS_MCP_INT_PARITY) {
897 /* Parity error detected by Master */
898 dev_err_ratelimited(cdns->dev, "Parity error\n");
901 if (int_status & CDNS_MCP_INT_CTRL_CLASH) {
902 /* Slave is driving bit slot during control word */
903 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n");
906 if (int_status & CDNS_MCP_INT_DATA_CLASH) {
908 * Multiple slaves trying to drive bit slot, or issue with
909 * ownership of data bits or Slave gone bonkers
911 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n");
914 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL &&
915 int_status & CDNS_MCP_INT_DPINT) {
918 /* just log which ports report an error */
919 port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT);
920 dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n",
923 /* clear status w/ write1 */
924 cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat);
927 if (int_status & CDNS_MCP_INT_SLAVE_MASK) {
928 /* Mask the Slave interrupt and wake thread */
929 cdns_updatel(cdns, CDNS_MCP_INTMASK,
930 CDNS_MCP_INT_SLAVE_MASK, 0);
932 int_status &= ~CDNS_MCP_INT_SLAVE_MASK;
935 * Deal with possible race condition between interrupt
936 * handling and disabling interrupts on suspend.
938 * If the master is in the process of disabling
939 * interrupts, don't schedule a workqueue
941 if (cdns->interrupt_enabled)
942 schedule_work(&cdns->work);
945 cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status);
948 EXPORT_SYMBOL(sdw_cdns_irq);
951 * cdns_update_slave_status_work - update slave status in a work since we will need to handle
952 * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave
954 * @work: cdns worker thread
956 static void cdns_update_slave_status_work(struct work_struct *work)
958 struct sdw_cdns *cdns =
959 container_of(work, struct sdw_cdns, work);
966 * Clear main interrupt first so we don't lose any assertions
967 * that happen during this function.
969 cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK);
971 slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
972 slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
975 * Clear the bits before handling so we don't lose any
976 * bits that re-assert.
978 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0);
979 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1);
981 /* combine the two status */
982 slave_intstat = ((u64)slave1 << 32) | slave0;
984 dev_dbg_ratelimited(cdns->dev, "Slave status change: 0x%llx\n", slave_intstat);
987 cdns_update_slave_status(cdns, slave_intstat);
990 * When there is more than one peripheral per link, it's
991 * possible that a deviceB becomes attached after we deal with
992 * the attachment of deviceA. Since the hardware does a
993 * logical AND, the attachment of the second device does not
994 * change the status seen by the driver.
996 * In that case, clearing the registers above would result in
997 * the deviceB never being detected - until a change of status
998 * is observed on the bus.
1000 * To avoid this race condition, re-check if any device0 needs
1001 * attention with PING commands. There is no need to check for
1002 * ALERTS since they are not allowed until a non-zero
1003 * device_number is assigned.
1005 * Do not clear the INTSTAT0/1. While looping to enumerate devices on
1006 * #0 there could be status changes on other devices - these must
1007 * be kept in the INTSTAT so they can be handled when all #0 devices
1008 * have been handled.
1011 device0_status = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
1012 device0_status &= 3;
1014 if (device0_status == SDW_SLAVE_ATTACHED) {
1015 if (retry_count++ < SDW_MAX_DEVICES) {
1016 dev_dbg_ratelimited(cdns->dev,
1017 "Device0 detected after clearing status, iteration %d\n",
1019 slave_intstat = CDNS_MCP_SLAVE_INTSTAT_ATTACHED;
1022 dev_err_ratelimited(cdns->dev,
1023 "Device0 detected after %d iterations\n",
1028 /* unmask Slave interrupt now */
1029 cdns_updatel(cdns, CDNS_MCP_INTMASK,
1030 CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);
1034 /* paranoia check to make sure self-cleared bits are indeed cleared */
1035 void sdw_cdns_check_self_clearing_bits(struct sdw_cdns *cdns, const char *string,
1036 bool initial_delay, int reset_iterations)
1039 u32 mcp_config_update;
1043 usleep_range(1000, 1500);
1045 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL);
1047 /* the following bits should be cleared immediately */
1048 if (mcp_control & CDNS_MCP_CONTROL_CMD_RST)
1049 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CMD_RST is not cleared\n", string);
1050 if (mcp_control & CDNS_MCP_CONTROL_SOFT_RST)
1051 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SOFT_RST is not cleared\n", string);
1052 if (mcp_control & CDNS_MCP_CONTROL_SW_RST)
1053 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SW_RST is not cleared\n", string);
1054 if (mcp_control & CDNS_MCP_CONTROL_CLK_STOP_CLR)
1055 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CLK_STOP_CLR is not cleared\n", string);
1056 mcp_config_update = cdns_readl(cdns, CDNS_MCP_CONFIG_UPDATE);
1057 if (mcp_config_update & CDNS_MCP_CONFIG_UPDATE_BIT)
1058 dev_err(cdns->dev, "%s failed: MCP_CONFIG_UPDATE_BIT is not cleared\n", string);
1061 while (mcp_control & CDNS_MCP_CONTROL_HW_RST) {
1062 if (i == reset_iterations) {
1063 dev_err(cdns->dev, "%s failed: MCP_CONTROL_HW_RST is not cleared\n", string);
1067 dev_dbg(cdns->dev, "%s: MCP_CONTROL_HW_RST is not cleared at iteration %d\n", string, i);
1070 usleep_range(1000, 1500);
1071 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL);
1075 EXPORT_SYMBOL(sdw_cdns_check_self_clearing_bits);
1082 * sdw_cdns_exit_reset() - Program reset parameters and start bus operations
1083 * @cdns: Cadence instance
1085 int sdw_cdns_exit_reset(struct sdw_cdns *cdns)
1087 /* keep reset delay unchanged to 4096 cycles */
1089 /* use hardware generated reset */
1090 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1091 CDNS_MCP_CONTROL_HW_RST,
1092 CDNS_MCP_CONTROL_HW_RST);
1094 /* commit changes */
1095 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
1096 CDNS_MCP_CONFIG_UPDATE_BIT,
1097 CDNS_MCP_CONFIG_UPDATE_BIT);
1099 /* don't wait here */
1103 EXPORT_SYMBOL(sdw_cdns_exit_reset);
1106 * cdns_enable_slave_interrupts() - Enable SDW slave interrupts
1107 * @cdns: Cadence instance
1108 * @state: boolean for true/false
1110 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state)
1114 mask = cdns_readl(cdns, CDNS_MCP_INTMASK);
1116 mask |= CDNS_MCP_INT_SLAVE_MASK;
1118 mask &= ~CDNS_MCP_INT_SLAVE_MASK;
1120 cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
1124 * sdw_cdns_enable_interrupt() - Enable SDW interrupts
1125 * @cdns: Cadence instance
1126 * @state: True if we are trying to enable interrupt.
1128 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)
1130 u32 slave_intmask0 = 0;
1131 u32 slave_intmask1 = 0;
1137 slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK;
1138 slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK;
1140 /* enable detection of all slave state changes */
1141 mask = CDNS_MCP_INT_SLAVE_MASK;
1143 /* enable detection of bus issues */
1144 mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
1145 CDNS_MCP_INT_PARITY;
1147 /* port interrupt limited to test modes for now */
1148 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1149 mask |= CDNS_MCP_INT_DPINT;
1151 /* enable detection of RX fifo level */
1152 mask |= CDNS_MCP_INT_RX_WL;
1155 * CDNS_MCP_INT_IRQ needs to be set otherwise all previous
1156 * settings are irrelevant
1158 mask |= CDNS_MCP_INT_IRQ;
1160 if (interrupt_mask) /* parameter override */
1161 mask = interrupt_mask;
1164 /* clear slave interrupt status before enabling interrupt */
1168 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
1169 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state);
1170 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
1171 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state);
1173 cdns->interrupt_enabled = state;
1176 * Complete any on-going status updates before updating masks,
1177 * and cancel queued status updates.
1179 * There could be a race with a new interrupt thrown before
1180 * the 3 mask updates below are complete, so in the interrupt
1181 * we use the 'interrupt_enabled' status to prevent new work
1182 * from being queued.
1185 cancel_work_sync(&cdns->work);
1187 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0);
1188 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1);
1189 cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
1193 EXPORT_SYMBOL(sdw_cdns_enable_interrupt);
1195 static int cdns_allocate_pdi(struct sdw_cdns *cdns,
1196 struct sdw_cdns_pdi **stream,
1197 u32 num, u32 pdi_offset)
1199 struct sdw_cdns_pdi *pdi;
1205 pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL);
1209 for (i = 0; i < num; i++) {
1210 pdi[i].num = i + pdi_offset;
1218 * sdw_cdns_pdi_init() - PDI initialization routine
1220 * @cdns: Cadence instance
1221 * @config: Stream configurations
1223 int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
1224 struct sdw_cdns_stream_config config)
1226 struct sdw_cdns_streams *stream;
1230 cdns->pcm.num_bd = config.pcm_bd;
1231 cdns->pcm.num_in = config.pcm_in;
1232 cdns->pcm.num_out = config.pcm_out;
1234 /* Allocate PDIs for PCMs */
1235 stream = &cdns->pcm;
1237 /* we allocate PDI0 and PDI1 which are used for Bulk */
1240 ret = cdns_allocate_pdi(cdns, &stream->bd,
1241 stream->num_bd, offset);
1245 offset += stream->num_bd;
1247 ret = cdns_allocate_pdi(cdns, &stream->in,
1248 stream->num_in, offset);
1252 offset += stream->num_in;
1254 ret = cdns_allocate_pdi(cdns, &stream->out,
1255 stream->num_out, offset);
1259 /* Update total number of PCM PDIs */
1260 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1261 cdns->num_ports = stream->num_pdi;
1265 EXPORT_SYMBOL(sdw_cdns_pdi_init);
1267 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
1273 r = sdw_find_row_index(n_rows);
1274 c = sdw_find_col_index(n_cols);
1276 val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r);
1277 val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c);
1282 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
1284 struct sdw_bus *bus = &cdns->bus;
1285 struct sdw_master_prop *prop = &bus->prop;
1290 /* Set clock divider */
1291 divider = (prop->mclk_freq / prop->max_clk_freq) - 1;
1293 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0,
1294 CDNS_MCP_CLK_MCLKD_MASK, divider);
1295 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1,
1296 CDNS_MCP_CLK_MCLKD_MASK, divider);
1299 * Frame shape changes after initialization have to be done
1300 * with the bank switch mechanism
1302 val = cdns_set_initial_frame_shape(prop->default_row,
1304 cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val);
1306 /* Set SSP interval to default value */
1307 ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ;
1308 cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval);
1309 cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval);
1313 * sdw_cdns_init() - Cadence initialization
1314 * @cdns: Cadence instance
1316 int sdw_cdns_init(struct sdw_cdns *cdns)
1320 cdns_init_clock_ctrl(cdns);
1322 sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);
1324 /* reset msg_count to default value of FIFOLEVEL */
1325 cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL);
1327 /* flush command FIFOs */
1328 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST,
1329 CDNS_MCP_CONTROL_CMD_RST);
1331 /* Set cmd accept mode */
1332 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
1333 CDNS_MCP_CONTROL_CMD_ACCEPT);
1335 /* Configure mcp config */
1336 val = cdns_readl(cdns, CDNS_MCP_CONFIG);
1338 /* enable bus operations with clock and data */
1339 val &= ~CDNS_MCP_CONFIG_OP;
1340 val |= CDNS_MCP_CONFIG_OP_NORMAL;
1342 /* Set cmd mode for Tx and Rx cmds */
1343 val &= ~CDNS_MCP_CONFIG_CMD;
1345 /* Disable sniffer mode */
1346 val &= ~CDNS_MCP_CONFIG_SNIFFER;
1348 /* Disable auto bus release */
1349 val &= ~CDNS_MCP_CONFIG_BUS_REL;
1351 if (cdns->bus.multi_link)
1352 /* Set Multi-master mode to take gsync into account */
1353 val |= CDNS_MCP_CONFIG_MMASTER;
1355 /* leave frame delay to hardware default of 0x1F */
1357 /* leave command retry to hardware default of 0 */
1359 cdns_writel(cdns, CDNS_MCP_CONFIG, val);
1361 /* changes will be committed later */
1364 EXPORT_SYMBOL(sdw_cdns_init);
1366 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params)
1368 struct sdw_master_prop *prop = &bus->prop;
1369 struct sdw_cdns *cdns = bus_to_cdns(bus);
1370 int mcp_clkctrl_off;
1373 if (!params->curr_dr_freq) {
1374 dev_err(cdns->dev, "NULL curr_dr_freq\n");
1378 divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR /
1379 params->curr_dr_freq;
1380 divider--; /* divider is 1/(N+1) */
1382 if (params->next_bank)
1383 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1;
1385 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0;
1387 cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider);
1391 EXPORT_SYMBOL(cdns_bus_conf);
1393 static int cdns_port_params(struct sdw_bus *bus,
1394 struct sdw_port_params *p_params, unsigned int bank)
1396 struct sdw_cdns *cdns = bus_to_cdns(bus);
1397 int dpn_config_off_source;
1398 int dpn_config_off_target;
1399 int target_num = p_params->num;
1400 int source_num = p_params->num;
1401 bool override = false;
1404 if (target_num == cdns->pdi_loopback_target &&
1405 cdns->pdi_loopback_source != -1) {
1406 source_num = cdns->pdi_loopback_source;
1411 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num);
1412 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num);
1414 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num);
1415 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num);
1418 dpn_config = cdns_readl(cdns, dpn_config_off_source);
1420 /* use port params if there is no loopback, otherwise use source as is */
1422 u32p_replace_bits(&dpn_config, p_params->bps - 1, CDNS_DPN_CONFIG_WL);
1423 u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW);
1424 u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT);
1427 cdns_writel(cdns, dpn_config_off_target, dpn_config);
1432 static int cdns_transport_params(struct sdw_bus *bus,
1433 struct sdw_transport_params *t_params,
1434 enum sdw_reg_bank bank)
1436 struct sdw_cdns *cdns = bus_to_cdns(bus);
1438 int dpn_config_off_source;
1439 int dpn_config_off_target;
1441 int dpn_hctrl_off_source;
1442 int dpn_hctrl_off_target;
1444 int dpn_offsetctrl_off_source;
1445 int dpn_offsetctrl_off_target;
1447 int dpn_samplectrl_off_source;
1448 int dpn_samplectrl_off_target;
1449 int source_num = t_params->port_num;
1450 int target_num = t_params->port_num;
1451 bool override = false;
1453 if (target_num == cdns->pdi_loopback_target &&
1454 cdns->pdi_loopback_source != -1) {
1455 source_num = cdns->pdi_loopback_source;
1460 * Note: Only full data port is supported on the Master side for
1461 * both PCM and PDM ports.
1465 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num);
1466 dpn_hctrl_off_source = CDNS_DPN_B1_HCTRL(source_num);
1467 dpn_offsetctrl_off_source = CDNS_DPN_B1_OFFSET_CTRL(source_num);
1468 dpn_samplectrl_off_source = CDNS_DPN_B1_SAMPLE_CTRL(source_num);
1470 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num);
1471 dpn_hctrl_off_target = CDNS_DPN_B1_HCTRL(target_num);
1472 dpn_offsetctrl_off_target = CDNS_DPN_B1_OFFSET_CTRL(target_num);
1473 dpn_samplectrl_off_target = CDNS_DPN_B1_SAMPLE_CTRL(target_num);
1476 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num);
1477 dpn_hctrl_off_source = CDNS_DPN_B0_HCTRL(source_num);
1478 dpn_offsetctrl_off_source = CDNS_DPN_B0_OFFSET_CTRL(source_num);
1479 dpn_samplectrl_off_source = CDNS_DPN_B0_SAMPLE_CTRL(source_num);
1481 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num);
1482 dpn_hctrl_off_target = CDNS_DPN_B0_HCTRL(target_num);
1483 dpn_offsetctrl_off_target = CDNS_DPN_B0_OFFSET_CTRL(target_num);
1484 dpn_samplectrl_off_target = CDNS_DPN_B0_SAMPLE_CTRL(target_num);
1487 dpn_config = cdns_readl(cdns, dpn_config_off_source);
1489 u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC);
1490 u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM);
1492 cdns_writel(cdns, dpn_config_off_target, dpn_config);
1496 u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1);
1497 u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2);
1499 dpn_offsetctrl = cdns_readl(cdns, dpn_offsetctrl_off_source);
1501 cdns_writel(cdns, dpn_offsetctrl_off_target, dpn_offsetctrl);
1505 u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART);
1506 u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP);
1507 u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL);
1509 dpn_hctrl = cdns_readl(cdns, dpn_hctrl_off_source);
1511 cdns_writel(cdns, dpn_hctrl_off_target, dpn_hctrl);
1514 dpn_samplectrl = t_params->sample_interval - 1;
1516 dpn_samplectrl = cdns_readl(cdns, dpn_samplectrl_off_source);
1517 cdns_writel(cdns, dpn_samplectrl_off_target, dpn_samplectrl);
1522 static int cdns_port_enable(struct sdw_bus *bus,
1523 struct sdw_enable_ch *enable_ch, unsigned int bank)
1525 struct sdw_cdns *cdns = bus_to_cdns(bus);
1526 int dpn_chnen_off, ch_mask;
1529 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num);
1531 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num);
1533 ch_mask = enable_ch->ch_mask * enable_ch->enable;
1534 cdns_writel(cdns, dpn_chnen_off, ch_mask);
1539 static const struct sdw_master_port_ops cdns_port_ops = {
1540 .dpn_set_port_params = cdns_port_params,
1541 .dpn_set_port_transport_params = cdns_transport_params,
1542 .dpn_port_enable_ch = cdns_port_enable,
1546 * sdw_cdns_is_clock_stop: Check clock status
1548 * @cdns: Cadence instance
1550 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns)
1552 return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP);
1554 EXPORT_SYMBOL(sdw_cdns_is_clock_stop);
1557 * sdw_cdns_clock_stop: Cadence clock stop configuration routine
1559 * @cdns: Cadence instance
1560 * @block_wake: prevent wakes if required by the platform
1562 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake)
1564 bool slave_present = false;
1565 struct sdw_slave *slave;
1568 sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);
1570 /* Check suspend status */
1571 if (sdw_cdns_is_clock_stop(cdns)) {
1572 dev_dbg(cdns->dev, "Clock is already stopped\n");
1577 * Before entering clock stop we mask the Slave
1578 * interrupts. This helps avoid having to deal with e.g. a
1579 * Slave becoming UNATTACHED while the clock is being stopped
1581 cdns_enable_slave_interrupts(cdns, false);
1584 * For specific platforms, it is required to be able to put
1585 * master into a state in which it ignores wake-up trials
1586 * in clock stop state
1589 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1590 CDNS_MCP_CONTROL_BLOCK_WAKEUP,
1591 CDNS_MCP_CONTROL_BLOCK_WAKEUP);
1593 list_for_each_entry(slave, &cdns->bus.slaves, node) {
1594 if (slave->status == SDW_SLAVE_ATTACHED ||
1595 slave->status == SDW_SLAVE_ALERT) {
1596 slave_present = true;
1601 /* commit changes */
1602 ret = cdns_config_update(cdns);
1604 dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1608 /* Prepare slaves for clock stop */
1609 if (slave_present) {
1610 ret = sdw_bus_prep_clk_stop(&cdns->bus);
1611 if (ret < 0 && ret != -ENODATA) {
1612 dev_err(cdns->dev, "prepare clock stop failed %d\n", ret);
1618 * Enter clock stop mode and only report errors if there are
1619 * Slave devices present (ALERT or ATTACHED)
1621 ret = sdw_bus_clk_stop(&cdns->bus);
1622 if (ret < 0 && slave_present && ret != -ENODATA) {
1623 dev_err(cdns->dev, "bus clock stop failed %d\n", ret);
1627 ret = cdns_set_wait(cdns, CDNS_MCP_STAT,
1628 CDNS_MCP_STAT_CLK_STOP,
1629 CDNS_MCP_STAT_CLK_STOP);
1631 dev_err(cdns->dev, "Clock stop failed %d\n", ret);
1635 EXPORT_SYMBOL(sdw_cdns_clock_stop);
1638 * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine
1640 * @cdns: Cadence instance
1641 * @bus_reset: context may be lost while in low power modes and the bus
1642 * may require a Severe Reset and re-enumeration after a wake.
1644 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset)
1648 /* unmask Slave interrupts that were masked when stopping the clock */
1649 cdns_enable_slave_interrupts(cdns, true);
1651 ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,
1652 CDNS_MCP_CONTROL_CLK_STOP_CLR);
1654 dev_err(cdns->dev, "Couldn't exit from clock stop\n");
1658 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0);
1660 dev_err(cdns->dev, "clock stop exit failed %d\n", ret);
1664 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1665 CDNS_MCP_CONTROL_BLOCK_WAKEUP, 0);
1667 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
1668 CDNS_MCP_CONTROL_CMD_ACCEPT);
1672 /* enable bus operations with clock and data */
1673 cdns_updatel(cdns, CDNS_MCP_CONFIG,
1675 CDNS_MCP_CONFIG_OP_NORMAL);
1677 ret = cdns_config_update(cdns);
1679 dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1683 ret = sdw_bus_exit_clk_stop(&cdns->bus);
1685 dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret);
1690 EXPORT_SYMBOL(sdw_cdns_clock_restart);
1693 * sdw_cdns_probe() - Cadence probe routine
1694 * @cdns: Cadence instance
1696 int sdw_cdns_probe(struct sdw_cdns *cdns)
1698 init_completion(&cdns->tx_complete);
1699 cdns->bus.port_ops = &cdns_port_ops;
1701 INIT_WORK(&cdns->work, cdns_update_slave_status_work);
1704 EXPORT_SYMBOL(sdw_cdns_probe);
1706 int cdns_set_sdw_stream(struct snd_soc_dai *dai,
1707 void *stream, int direction)
1709 struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
1710 struct sdw_cdns_dma_data *dma;
1713 /* first paranoia check */
1714 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1715 dma = dai->playback_dma_data;
1717 dma = dai->capture_dma_data;
1721 "dma_data already allocated for dai %s\n",
1726 /* allocate and set dma info */
1727 dma = kzalloc(sizeof(*dma), GFP_KERNEL);
1731 dma->stream_type = SDW_STREAM_PCM;
1733 dma->bus = &cdns->bus;
1734 dma->link_id = cdns->instance;
1736 dma->stream = stream;
1738 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1739 dai->playback_dma_data = dma;
1741 dai->capture_dma_data = dma;
1743 /* for NULL stream we release allocated dma_data */
1744 if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
1745 kfree(dai->playback_dma_data);
1746 dai->playback_dma_data = NULL;
1748 kfree(dai->capture_dma_data);
1749 dai->capture_dma_data = NULL;
1754 EXPORT_SYMBOL(cdns_set_sdw_stream);
1757 * cdns_find_pdi() - Find a free PDI
1759 * @cdns: Cadence instance
1760 * @offset: Starting offset
1761 * @num: Number of PDIs
1762 * @pdi: PDI instances
1765 * Find a PDI for a given PDI array. The PDI num and dai_id are
1766 * expected to match, return NULL otherwise.
1768 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns,
1769 unsigned int offset,
1771 struct sdw_cdns_pdi *pdi,
1776 for (i = offset; i < offset + num; i++)
1777 if (pdi[i].num == dai_id)
1784 * sdw_cdns_config_stream: Configure a stream
1786 * @cdns: Cadence instance
1787 * @ch: Channel count
1788 * @dir: Data direction
1789 * @pdi: PDI to be used
1791 void sdw_cdns_config_stream(struct sdw_cdns *cdns,
1792 u32 ch, u32 dir, struct sdw_cdns_pdi *pdi)
1794 u32 offset, val = 0;
1796 if (dir == SDW_DATA_DIR_RX) {
1797 val = CDNS_PORTCTRL_DIRN;
1799 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1800 val |= CDNS_PORTCTRL_TEST_FAILED;
1802 offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET;
1803 cdns_updatel(cdns, offset,
1804 CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED,
1808 val |= CDNS_PDI_CONFIG_SOFT_RESET;
1809 val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1);
1810 cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val);
1812 EXPORT_SYMBOL(sdw_cdns_config_stream);
1815 * sdw_cdns_alloc_pdi() - Allocate a PDI
1817 * @cdns: Cadence instance
1818 * @stream: Stream to be allocated
1819 * @ch: Channel count
1820 * @dir: Data direction
1823 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns,
1824 struct sdw_cdns_streams *stream,
1825 u32 ch, u32 dir, int dai_id)
1827 struct sdw_cdns_pdi *pdi = NULL;
1829 if (dir == SDW_DATA_DIR_RX)
1830 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in,
1833 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out,
1836 /* check if we found a PDI, else find in bi-directional */
1838 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd,
1843 pdi->h_ch_num = ch - 1;
1850 EXPORT_SYMBOL(sdw_cdns_alloc_pdi);
1852 MODULE_LICENSE("Dual BSD/GPL");
1853 MODULE_DESCRIPTION("Cadence Soundwire Library");