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dd3c5284 MR |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Silvaco dual-role I3C master driver | |
4 | * | |
5 | * Copyright (C) 2020 Silvaco | |
6 | * Author: Miquel RAYNAL <miquel.raynal@bootlin.com> | |
7 | * Based on a work from: Conor Culhane <conor.culhane@silvaco.com> | |
8 | */ | |
9 | ||
10 | #include <linux/bitfield.h> | |
11 | #include <linux/clk.h> | |
12 | #include <linux/completion.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/i3c/master.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/iopoll.h> | |
17 | #include <linux/list.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/of.h> | |
05be23ef | 20 | #include <linux/pinctrl/consumer.h> |
dd3c5284 | 21 | #include <linux/platform_device.h> |
05be23ef | 22 | #include <linux/pm_runtime.h> |
dd3c5284 MR |
23 | |
24 | /* Master Mode Registers */ | |
25 | #define SVC_I3C_MCONFIG 0x000 | |
26 | #define SVC_I3C_MCONFIG_MASTER_EN BIT(0) | |
27 | #define SVC_I3C_MCONFIG_DISTO(x) FIELD_PREP(BIT(3), (x)) | |
28 | #define SVC_I3C_MCONFIG_HKEEP(x) FIELD_PREP(GENMASK(5, 4), (x)) | |
29 | #define SVC_I3C_MCONFIG_ODSTOP(x) FIELD_PREP(BIT(6), (x)) | |
30 | #define SVC_I3C_MCONFIG_PPBAUD(x) FIELD_PREP(GENMASK(11, 8), (x)) | |
31 | #define SVC_I3C_MCONFIG_PPLOW(x) FIELD_PREP(GENMASK(15, 12), (x)) | |
32 | #define SVC_I3C_MCONFIG_ODBAUD(x) FIELD_PREP(GENMASK(23, 16), (x)) | |
33 | #define SVC_I3C_MCONFIG_ODHPP(x) FIELD_PREP(BIT(24), (x)) | |
34 | #define SVC_I3C_MCONFIG_SKEW(x) FIELD_PREP(GENMASK(27, 25), (x)) | |
35 | #define SVC_I3C_MCONFIG_I2CBAUD(x) FIELD_PREP(GENMASK(31, 28), (x)) | |
36 | ||
37 | #define SVC_I3C_MCTRL 0x084 | |
38 | #define SVC_I3C_MCTRL_REQUEST_MASK GENMASK(2, 0) | |
39 | #define SVC_I3C_MCTRL_REQUEST_NONE 0 | |
40 | #define SVC_I3C_MCTRL_REQUEST_START_ADDR 1 | |
41 | #define SVC_I3C_MCTRL_REQUEST_STOP 2 | |
42 | #define SVC_I3C_MCTRL_REQUEST_IBI_ACKNACK 3 | |
43 | #define SVC_I3C_MCTRL_REQUEST_PROC_DAA 4 | |
44 | #define SVC_I3C_MCTRL_REQUEST_AUTO_IBI 7 | |
45 | #define SVC_I3C_MCTRL_TYPE_I3C 0 | |
46 | #define SVC_I3C_MCTRL_TYPE_I2C BIT(4) | |
47 | #define SVC_I3C_MCTRL_IBIRESP_AUTO 0 | |
48 | #define SVC_I3C_MCTRL_IBIRESP_ACK_WITHOUT_BYTE 0 | |
49 | #define SVC_I3C_MCTRL_IBIRESP_ACK_WITH_BYTE BIT(7) | |
50 | #define SVC_I3C_MCTRL_IBIRESP_NACK BIT(6) | |
51 | #define SVC_I3C_MCTRL_IBIRESP_MANUAL GENMASK(7, 6) | |
52 | #define SVC_I3C_MCTRL_DIR(x) FIELD_PREP(BIT(8), (x)) | |
53 | #define SVC_I3C_MCTRL_DIR_WRITE 0 | |
54 | #define SVC_I3C_MCTRL_DIR_READ 1 | |
55 | #define SVC_I3C_MCTRL_ADDR(x) FIELD_PREP(GENMASK(15, 9), (x)) | |
56 | #define SVC_I3C_MCTRL_RDTERM(x) FIELD_PREP(GENMASK(23, 16), (x)) | |
57 | ||
58 | #define SVC_I3C_MSTATUS 0x088 | |
59 | #define SVC_I3C_MSTATUS_STATE(x) FIELD_GET(GENMASK(2, 0), (x)) | |
60 | #define SVC_I3C_MSTATUS_STATE_DAA(x) (SVC_I3C_MSTATUS_STATE(x) == 5) | |
61 | #define SVC_I3C_MSTATUS_STATE_IDLE(x) (SVC_I3C_MSTATUS_STATE(x) == 0) | |
62 | #define SVC_I3C_MSTATUS_BETWEEN(x) FIELD_GET(BIT(4), (x)) | |
63 | #define SVC_I3C_MSTATUS_NACKED(x) FIELD_GET(BIT(5), (x)) | |
64 | #define SVC_I3C_MSTATUS_IBITYPE(x) FIELD_GET(GENMASK(7, 6), (x)) | |
65 | #define SVC_I3C_MSTATUS_IBITYPE_IBI 1 | |
66 | #define SVC_I3C_MSTATUS_IBITYPE_MASTER_REQUEST 2 | |
67 | #define SVC_I3C_MSTATUS_IBITYPE_HOT_JOIN 3 | |
68 | #define SVC_I3C_MINT_SLVSTART BIT(8) | |
69 | #define SVC_I3C_MINT_MCTRLDONE BIT(9) | |
70 | #define SVC_I3C_MINT_COMPLETE BIT(10) | |
71 | #define SVC_I3C_MINT_RXPEND BIT(11) | |
72 | #define SVC_I3C_MINT_TXNOTFULL BIT(12) | |
73 | #define SVC_I3C_MINT_IBIWON BIT(13) | |
74 | #define SVC_I3C_MINT_ERRWARN BIT(15) | |
75 | #define SVC_I3C_MSTATUS_SLVSTART(x) FIELD_GET(SVC_I3C_MINT_SLVSTART, (x)) | |
76 | #define SVC_I3C_MSTATUS_MCTRLDONE(x) FIELD_GET(SVC_I3C_MINT_MCTRLDONE, (x)) | |
77 | #define SVC_I3C_MSTATUS_COMPLETE(x) FIELD_GET(SVC_I3C_MINT_COMPLETE, (x)) | |
78 | #define SVC_I3C_MSTATUS_RXPEND(x) FIELD_GET(SVC_I3C_MINT_RXPEND, (x)) | |
79 | #define SVC_I3C_MSTATUS_TXNOTFULL(x) FIELD_GET(SVC_I3C_MINT_TXNOTFULL, (x)) | |
80 | #define SVC_I3C_MSTATUS_IBIWON(x) FIELD_GET(SVC_I3C_MINT_IBIWON, (x)) | |
81 | #define SVC_I3C_MSTATUS_ERRWARN(x) FIELD_GET(SVC_I3C_MINT_ERRWARN, (x)) | |
82 | #define SVC_I3C_MSTATUS_IBIADDR(x) FIELD_GET(GENMASK(30, 24), (x)) | |
83 | ||
84 | #define SVC_I3C_IBIRULES 0x08C | |
85 | #define SVC_I3C_IBIRULES_ADDR(slot, addr) FIELD_PREP(GENMASK(29, 0), \ | |
86 | ((addr) & 0x3F) << ((slot) * 6)) | |
87 | #define SVC_I3C_IBIRULES_ADDRS 5 | |
88 | #define SVC_I3C_IBIRULES_MSB0 BIT(30) | |
89 | #define SVC_I3C_IBIRULES_NOBYTE BIT(31) | |
90 | #define SVC_I3C_IBIRULES_MANDBYTE 0 | |
91 | #define SVC_I3C_MINTSET 0x090 | |
92 | #define SVC_I3C_MINTCLR 0x094 | |
93 | #define SVC_I3C_MINTMASKED 0x098 | |
94 | #define SVC_I3C_MERRWARN 0x09C | |
49b472eb | 95 | #define SVC_I3C_MERRWARN_NACK BIT(2) |
9aaeef11 | 96 | #define SVC_I3C_MERRWARN_TIMEOUT BIT(20) |
dd3c5284 MR |
97 | #define SVC_I3C_MDMACTRL 0x0A0 |
98 | #define SVC_I3C_MDATACTRL 0x0AC | |
99 | #define SVC_I3C_MDATACTRL_FLUSHTB BIT(0) | |
100 | #define SVC_I3C_MDATACTRL_FLUSHRB BIT(1) | |
101 | #define SVC_I3C_MDATACTRL_UNLOCK_TRIG BIT(3) | |
102 | #define SVC_I3C_MDATACTRL_TXTRIG_FIFO_NOT_FULL GENMASK(5, 4) | |
103 | #define SVC_I3C_MDATACTRL_RXTRIG_FIFO_NOT_EMPTY 0 | |
104 | #define SVC_I3C_MDATACTRL_RXCOUNT(x) FIELD_GET(GENMASK(28, 24), (x)) | |
105 | #define SVC_I3C_MDATACTRL_TXFULL BIT(30) | |
106 | #define SVC_I3C_MDATACTRL_RXEMPTY BIT(31) | |
107 | ||
108 | #define SVC_I3C_MWDATAB 0x0B0 | |
109 | #define SVC_I3C_MWDATAB_END BIT(8) | |
110 | ||
111 | #define SVC_I3C_MWDATABE 0x0B4 | |
112 | #define SVC_I3C_MWDATAH 0x0B8 | |
113 | #define SVC_I3C_MWDATAHE 0x0BC | |
114 | #define SVC_I3C_MRDATAB 0x0C0 | |
115 | #define SVC_I3C_MRDATAH 0x0C8 | |
116 | #define SVC_I3C_MWMSG_SDR 0x0D0 | |
117 | #define SVC_I3C_MRMSG_SDR 0x0D4 | |
118 | #define SVC_I3C_MWMSG_DDR 0x0D8 | |
119 | #define SVC_I3C_MRMSG_DDR 0x0DC | |
120 | ||
121 | #define SVC_I3C_MDYNADDR 0x0E4 | |
122 | #define SVC_MDYNADDR_VALID BIT(0) | |
123 | #define SVC_MDYNADDR_ADDR(x) FIELD_PREP(GENMASK(7, 1), (x)) | |
124 | ||
125 | #define SVC_I3C_MAX_DEVS 32 | |
05be23ef | 126 | #define SVC_I3C_PM_TIMEOUT_MS 1000 |
dd3c5284 MR |
127 | |
128 | /* This parameter depends on the implementation and may be tuned */ | |
129 | #define SVC_I3C_FIFO_SIZE 16 | |
130 | ||
05b26c31 FL |
131 | #define SVC_I3C_EVENT_IBI BIT(0) |
132 | #define SVC_I3C_EVENT_HOTJOIN BIT(1) | |
133 | ||
dd3c5284 MR |
134 | struct svc_i3c_cmd { |
135 | u8 addr; | |
136 | bool rnw; | |
137 | u8 *in; | |
138 | const void *out; | |
139 | unsigned int len; | |
6fb61734 | 140 | unsigned int actual_len; |
6d1a19d3 | 141 | struct i3c_priv_xfer *xfer; |
dd3c5284 MR |
142 | bool continued; |
143 | }; | |
144 | ||
145 | struct svc_i3c_xfer { | |
146 | struct list_head node; | |
147 | struct completion comp; | |
148 | int ret; | |
149 | unsigned int type; | |
150 | unsigned int ncmds; | |
a8b163e1 | 151 | struct svc_i3c_cmd cmds[] __counted_by(ncmds); |
dd3c5284 MR |
152 | }; |
153 | ||
1c5ee2a7 CW |
154 | struct svc_i3c_regs_save { |
155 | u32 mconfig; | |
156 | u32 mdynaddr; | |
157 | }; | |
158 | ||
dd3c5284 MR |
159 | /** |
160 | * struct svc_i3c_master - Silvaco I3C Master structure | |
161 | * @base: I3C master controller | |
162 | * @dev: Corresponding device | |
163 | * @regs: Memory mapping | |
5496eac6 | 164 | * @saved_regs: Volatile values for PM operations |
dd3c5284 MR |
165 | * @free_slots: Bit array of available slots |
166 | * @addrs: Array containing the dynamic addresses of each attached device | |
167 | * @descs: Array of descriptors, one per attached device | |
168 | * @hj_work: Hot-join work | |
169 | * @ibi_work: IBI work | |
170 | * @irq: Main interrupt | |
171 | * @pclk: System clock | |
172 | * @fclk: Fast clock (bus) | |
173 | * @sclk: Slow clock (other events) | |
174 | * @xferqueue: Transfer queue structure | |
175 | * @xferqueue.list: List member | |
176 | * @xferqueue.cur: Current ongoing transfer | |
177 | * @xferqueue.lock: Queue lock | |
178 | * @ibi: IBI structure | |
179 | * @ibi.num_slots: Number of slots available in @ibi.slots | |
180 | * @ibi.slots: Available IBI slots | |
181 | * @ibi.tbq_slot: To be queued IBI slot | |
182 | * @ibi.lock: IBI lock | |
6bf3fc26 | 183 | * @lock: Transfer lock, protect between IBI work thread and callbacks from master |
05b26c31 | 184 | * @enabled_events: Bit masks for enable events (IBI, HotJoin). |
dd3c5284 MR |
185 | */ |
186 | struct svc_i3c_master { | |
187 | struct i3c_master_controller base; | |
188 | struct device *dev; | |
189 | void __iomem *regs; | |
1c5ee2a7 | 190 | struct svc_i3c_regs_save saved_regs; |
dd3c5284 MR |
191 | u32 free_slots; |
192 | u8 addrs[SVC_I3C_MAX_DEVS]; | |
193 | struct i3c_dev_desc *descs[SVC_I3C_MAX_DEVS]; | |
194 | struct work_struct hj_work; | |
195 | struct work_struct ibi_work; | |
196 | int irq; | |
197 | struct clk *pclk; | |
198 | struct clk *fclk; | |
199 | struct clk *sclk; | |
200 | struct { | |
201 | struct list_head list; | |
202 | struct svc_i3c_xfer *cur; | |
203 | /* Prevent races between transfers */ | |
204 | spinlock_t lock; | |
205 | } xferqueue; | |
206 | struct { | |
207 | unsigned int num_slots; | |
208 | struct i3c_dev_desc **slots; | |
209 | struct i3c_ibi_slot *tbq_slot; | |
210 | /* Prevent races within IBI handlers */ | |
211 | spinlock_t lock; | |
212 | } ibi; | |
6bf3fc26 | 213 | struct mutex lock; |
05b26c31 | 214 | int enabled_events; |
dd3c5284 MR |
215 | }; |
216 | ||
217 | /** | |
3e5feb11 | 218 | * struct svc_i3c_i2c_dev_data - Device specific data |
dd3c5284 MR |
219 | * @index: Index in the master tables corresponding to this device |
220 | * @ibi: IBI slot index in the master structure | |
221 | * @ibi_pool: IBI pool associated to this device | |
222 | */ | |
223 | struct svc_i3c_i2c_dev_data { | |
224 | u8 index; | |
225 | int ibi; | |
226 | struct i3c_generic_ibi_pool *ibi_pool; | |
227 | }; | |
228 | ||
05b26c31 FL |
229 | static inline bool is_events_enabled(struct svc_i3c_master *master, u32 mask) |
230 | { | |
231 | return !!(master->enabled_events & mask); | |
232 | } | |
233 | ||
dd3c5284 MR |
234 | static bool svc_i3c_master_error(struct svc_i3c_master *master) |
235 | { | |
236 | u32 mstatus, merrwarn; | |
237 | ||
238 | mstatus = readl(master->regs + SVC_I3C_MSTATUS); | |
239 | if (SVC_I3C_MSTATUS_ERRWARN(mstatus)) { | |
240 | merrwarn = readl(master->regs + SVC_I3C_MERRWARN); | |
241 | writel(merrwarn, master->regs + SVC_I3C_MERRWARN); | |
9aaeef11 FL |
242 | |
243 | /* Ignore timeout error */ | |
244 | if (merrwarn & SVC_I3C_MERRWARN_TIMEOUT) { | |
245 | dev_dbg(master->dev, "Warning condition: MSTATUS 0x%08x, MERRWARN 0x%08x\n", | |
246 | mstatus, merrwarn); | |
247 | return false; | |
248 | } | |
249 | ||
dd3c5284 MR |
250 | dev_err(master->dev, |
251 | "Error condition: MSTATUS 0x%08x, MERRWARN 0x%08x\n", | |
252 | mstatus, merrwarn); | |
253 | ||
254 | return true; | |
255 | } | |
256 | ||
257 | return false; | |
258 | } | |
259 | ||
260 | static void svc_i3c_master_enable_interrupts(struct svc_i3c_master *master, u32 mask) | |
261 | { | |
262 | writel(mask, master->regs + SVC_I3C_MINTSET); | |
263 | } | |
264 | ||
265 | static void svc_i3c_master_disable_interrupts(struct svc_i3c_master *master) | |
266 | { | |
267 | u32 mask = readl(master->regs + SVC_I3C_MINTSET); | |
268 | ||
269 | writel(mask, master->regs + SVC_I3C_MINTCLR); | |
270 | } | |
271 | ||
9fd6b5ce CW |
272 | static void svc_i3c_master_clear_merrwarn(struct svc_i3c_master *master) |
273 | { | |
274 | /* Clear pending warnings */ | |
275 | writel(readl(master->regs + SVC_I3C_MERRWARN), | |
276 | master->regs + SVC_I3C_MERRWARN); | |
277 | } | |
278 | ||
279 | static void svc_i3c_master_flush_fifo(struct svc_i3c_master *master) | |
280 | { | |
281 | /* Flush FIFOs */ | |
282 | writel(SVC_I3C_MDATACTRL_FLUSHTB | SVC_I3C_MDATACTRL_FLUSHRB, | |
283 | master->regs + SVC_I3C_MDATACTRL); | |
284 | } | |
285 | ||
286 | static void svc_i3c_master_reset_fifo_trigger(struct svc_i3c_master *master) | |
287 | { | |
288 | u32 reg; | |
289 | ||
290 | /* Set RX and TX tigger levels, flush FIFOs */ | |
291 | reg = SVC_I3C_MDATACTRL_FLUSHTB | | |
292 | SVC_I3C_MDATACTRL_FLUSHRB | | |
293 | SVC_I3C_MDATACTRL_UNLOCK_TRIG | | |
294 | SVC_I3C_MDATACTRL_TXTRIG_FIFO_NOT_FULL | | |
295 | SVC_I3C_MDATACTRL_RXTRIG_FIFO_NOT_EMPTY; | |
296 | writel(reg, master->regs + SVC_I3C_MDATACTRL); | |
297 | } | |
298 | ||
299 | static void svc_i3c_master_reset(struct svc_i3c_master *master) | |
300 | { | |
301 | svc_i3c_master_clear_merrwarn(master); | |
302 | svc_i3c_master_reset_fifo_trigger(master); | |
303 | svc_i3c_master_disable_interrupts(master); | |
304 | } | |
305 | ||
dd3c5284 MR |
306 | static inline struct svc_i3c_master * |
307 | to_svc_i3c_master(struct i3c_master_controller *master) | |
308 | { | |
309 | return container_of(master, struct svc_i3c_master, base); | |
310 | } | |
311 | ||
312 | static void svc_i3c_master_hj_work(struct work_struct *work) | |
313 | { | |
314 | struct svc_i3c_master *master; | |
315 | ||
316 | master = container_of(work, struct svc_i3c_master, hj_work); | |
317 | i3c_master_do_daa(&master->base); | |
318 | } | |
319 | ||
320 | static struct i3c_dev_desc * | |
321 | svc_i3c_master_dev_from_addr(struct svc_i3c_master *master, | |
322 | unsigned int ibiaddr) | |
323 | { | |
324 | int i; | |
325 | ||
326 | for (i = 0; i < SVC_I3C_MAX_DEVS; i++) | |
327 | if (master->addrs[i] == ibiaddr) | |
328 | break; | |
329 | ||
330 | if (i == SVC_I3C_MAX_DEVS) | |
331 | return NULL; | |
332 | ||
333 | return master->descs[i]; | |
334 | } | |
335 | ||
336 | static void svc_i3c_master_emit_stop(struct svc_i3c_master *master) | |
337 | { | |
338 | writel(SVC_I3C_MCTRL_REQUEST_STOP, master->regs + SVC_I3C_MCTRL); | |
339 | ||
340 | /* | |
341 | * This delay is necessary after the emission of a stop, otherwise eg. | |
342 | * repeating IBIs do not get detected. There is a note in the manual | |
343 | * about it, stating that the stop condition might not be settled | |
344 | * correctly if a start condition follows too rapidly. | |
345 | */ | |
346 | udelay(1); | |
347 | } | |
348 | ||
dd3c5284 MR |
349 | static int svc_i3c_master_handle_ibi(struct svc_i3c_master *master, |
350 | struct i3c_dev_desc *dev) | |
351 | { | |
352 | struct svc_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev); | |
353 | struct i3c_ibi_slot *slot; | |
354 | unsigned int count; | |
355 | u32 mdatactrl; | |
c85e209b | 356 | int ret, val; |
dd3c5284 MR |
357 | u8 *buf; |
358 | ||
359 | slot = i3c_generic_ibi_get_free_slot(data->ibi_pool); | |
360 | if (!slot) | |
361 | return -ENOSPC; | |
362 | ||
363 | slot->len = 0; | |
364 | buf = slot->data; | |
365 | ||
c85e209b FL |
366 | ret = readl_relaxed_poll_timeout(master->regs + SVC_I3C_MSTATUS, val, |
367 | SVC_I3C_MSTATUS_COMPLETE(val), 0, 1000); | |
368 | if (ret) { | |
369 | dev_err(master->dev, "Timeout when polling for COMPLETE\n"); | |
370 | return ret; | |
371 | } | |
372 | ||
dd3c5284 MR |
373 | while (SVC_I3C_MSTATUS_RXPEND(readl(master->regs + SVC_I3C_MSTATUS)) && |
374 | slot->len < SVC_I3C_FIFO_SIZE) { | |
375 | mdatactrl = readl(master->regs + SVC_I3C_MDATACTRL); | |
376 | count = SVC_I3C_MDATACTRL_RXCOUNT(mdatactrl); | |
377 | readsl(master->regs + SVC_I3C_MRDATAB, buf, count); | |
378 | slot->len += count; | |
379 | buf += count; | |
380 | } | |
381 | ||
382 | master->ibi.tbq_slot = slot; | |
383 | ||
384 | return 0; | |
385 | } | |
386 | ||
387 | static void svc_i3c_master_ack_ibi(struct svc_i3c_master *master, | |
388 | bool mandatory_byte) | |
389 | { | |
390 | unsigned int ibi_ack_nack; | |
391 | ||
392 | ibi_ack_nack = SVC_I3C_MCTRL_REQUEST_IBI_ACKNACK; | |
393 | if (mandatory_byte) | |
394 | ibi_ack_nack |= SVC_I3C_MCTRL_IBIRESP_ACK_WITH_BYTE; | |
395 | else | |
396 | ibi_ack_nack |= SVC_I3C_MCTRL_IBIRESP_ACK_WITHOUT_BYTE; | |
397 | ||
398 | writel(ibi_ack_nack, master->regs + SVC_I3C_MCTRL); | |
399 | } | |
400 | ||
401 | static void svc_i3c_master_nack_ibi(struct svc_i3c_master *master) | |
402 | { | |
403 | writel(SVC_I3C_MCTRL_REQUEST_IBI_ACKNACK | | |
404 | SVC_I3C_MCTRL_IBIRESP_NACK, | |
405 | master->regs + SVC_I3C_MCTRL); | |
406 | } | |
407 | ||
408 | static void svc_i3c_master_ibi_work(struct work_struct *work) | |
409 | { | |
410 | struct svc_i3c_master *master = container_of(work, struct svc_i3c_master, ibi_work); | |
411 | struct svc_i3c_i2c_dev_data *data; | |
412 | unsigned int ibitype, ibiaddr; | |
413 | struct i3c_dev_desc *dev; | |
414 | u32 status, val; | |
415 | int ret; | |
416 | ||
6bf3fc26 | 417 | mutex_lock(&master->lock); |
38baed9b FL |
418 | /* |
419 | * IBIWON may be set before SVC_I3C_MCTRL_REQUEST_AUTO_IBI, causing | |
420 | * readl_relaxed_poll_timeout() to return immediately. Consequently, | |
421 | * ibitype will be 0 since it was last updated only after the 8th SCL | |
422 | * cycle, leading to missed client IBI handlers. | |
423 | * | |
424 | * A typical scenario is when IBIWON occurs and bus arbitration is lost | |
425 | * at svc_i3c_master_priv_xfers(). | |
426 | * | |
427 | * Clear SVC_I3C_MINT_IBIWON before sending SVC_I3C_MCTRL_REQUEST_AUTO_IBI. | |
428 | */ | |
429 | writel(SVC_I3C_MINT_IBIWON, master->regs + SVC_I3C_MSTATUS); | |
430 | ||
dd3c5284 MR |
431 | /* Acknowledge the incoming interrupt with the AUTOIBI mechanism */ |
432 | writel(SVC_I3C_MCTRL_REQUEST_AUTO_IBI | | |
433 | SVC_I3C_MCTRL_IBIRESP_AUTO, | |
434 | master->regs + SVC_I3C_MCTRL); | |
435 | ||
436 | /* Wait for IBIWON, should take approximately 100us */ | |
437 | ret = readl_relaxed_poll_timeout(master->regs + SVC_I3C_MSTATUS, val, | |
438 | SVC_I3C_MSTATUS_IBIWON(val), 0, 1000); | |
439 | if (ret) { | |
440 | dev_err(master->dev, "Timeout when polling for IBIWON\n"); | |
dfd7cd6a | 441 | svc_i3c_master_emit_stop(master); |
dd3c5284 MR |
442 | goto reenable_ibis; |
443 | } | |
444 | ||
dd3c5284 MR |
445 | status = readl(master->regs + SVC_I3C_MSTATUS); |
446 | ibitype = SVC_I3C_MSTATUS_IBITYPE(status); | |
447 | ibiaddr = SVC_I3C_MSTATUS_IBIADDR(status); | |
448 | ||
449 | /* Handle the critical responses to IBI's */ | |
450 | switch (ibitype) { | |
451 | case SVC_I3C_MSTATUS_IBITYPE_IBI: | |
452 | dev = svc_i3c_master_dev_from_addr(master, ibiaddr); | |
05b26c31 | 453 | if (!dev || !is_events_enabled(master, SVC_I3C_EVENT_IBI)) |
dd3c5284 MR |
454 | svc_i3c_master_nack_ibi(master); |
455 | else | |
456 | svc_i3c_master_handle_ibi(master, dev); | |
457 | break; | |
458 | case SVC_I3C_MSTATUS_IBITYPE_HOT_JOIN: | |
05b26c31 FL |
459 | if (is_events_enabled(master, SVC_I3C_EVENT_HOTJOIN)) |
460 | svc_i3c_master_ack_ibi(master, false); | |
461 | else | |
462 | svc_i3c_master_nack_ibi(master); | |
dd3c5284 MR |
463 | break; |
464 | case SVC_I3C_MSTATUS_IBITYPE_MASTER_REQUEST: | |
465 | svc_i3c_master_nack_ibi(master); | |
466 | break; | |
467 | default: | |
468 | break; | |
469 | } | |
470 | ||
471 | /* | |
472 | * If an error happened, we probably got interrupted and the exchange | |
473 | * timedout. In this case we just drop everything, emit a stop and wait | |
474 | * for the slave to interrupt again. | |
475 | */ | |
476 | if (svc_i3c_master_error(master)) { | |
477 | if (master->ibi.tbq_slot) { | |
478 | data = i3c_dev_get_master_data(dev); | |
479 | i3c_generic_ibi_recycle_slot(data->ibi_pool, | |
480 | master->ibi.tbq_slot); | |
481 | master->ibi.tbq_slot = NULL; | |
482 | } | |
483 | ||
484 | svc_i3c_master_emit_stop(master); | |
485 | ||
486 | goto reenable_ibis; | |
487 | } | |
488 | ||
489 | /* Handle the non critical tasks */ | |
490 | switch (ibitype) { | |
491 | case SVC_I3C_MSTATUS_IBITYPE_IBI: | |
492 | if (dev) { | |
493 | i3c_master_queue_ibi(dev, master->ibi.tbq_slot); | |
494 | master->ibi.tbq_slot = NULL; | |
495 | } | |
496 | svc_i3c_master_emit_stop(master); | |
497 | break; | |
498 | case SVC_I3C_MSTATUS_IBITYPE_HOT_JOIN: | |
05b26c31 FL |
499 | svc_i3c_master_emit_stop(master); |
500 | if (is_events_enabled(master, SVC_I3C_EVENT_HOTJOIN)) | |
501 | queue_work(master->base.wq, &master->hj_work); | |
dd3c5284 MR |
502 | break; |
503 | case SVC_I3C_MSTATUS_IBITYPE_MASTER_REQUEST: | |
504 | default: | |
505 | break; | |
506 | } | |
507 | ||
508 | reenable_ibis: | |
509 | svc_i3c_master_enable_interrupts(master, SVC_I3C_MINT_SLVSTART); | |
6bf3fc26 | 510 | mutex_unlock(&master->lock); |
dd3c5284 MR |
511 | } |
512 | ||
513 | static irqreturn_t svc_i3c_master_irq_handler(int irq, void *dev_id) | |
514 | { | |
515 | struct svc_i3c_master *master = (struct svc_i3c_master *)dev_id; | |
225d5ef0 | 516 | u32 active = readl(master->regs + SVC_I3C_MSTATUS); |
dd3c5284 MR |
517 | |
518 | if (!SVC_I3C_MSTATUS_SLVSTART(active)) | |
519 | return IRQ_NONE; | |
520 | ||
521 | /* Clear the interrupt status */ | |
522 | writel(SVC_I3C_MINT_SLVSTART, master->regs + SVC_I3C_MSTATUS); | |
523 | ||
524 | svc_i3c_master_disable_interrupts(master); | |
525 | ||
526 | /* Handle the interrupt in a non atomic context */ | |
527 | queue_work(master->base.wq, &master->ibi_work); | |
528 | ||
529 | return IRQ_HANDLED; | |
530 | } | |
531 | ||
532 | static int svc_i3c_master_bus_init(struct i3c_master_controller *m) | |
533 | { | |
534 | struct svc_i3c_master *master = to_svc_i3c_master(m); | |
535 | struct i3c_bus *bus = i3c_master_get_bus(m); | |
536 | struct i3c_device_info info = {}; | |
537 | unsigned long fclk_rate, fclk_period_ns; | |
538 | unsigned int high_period_ns, od_low_period_ns; | |
173fcb27 | 539 | u32 ppbaud, pplow, odhpp, odbaud, odstop, i2cbaud, reg; |
dd3c5284 MR |
540 | int ret; |
541 | ||
05be23ef CW |
542 | ret = pm_runtime_resume_and_get(master->dev); |
543 | if (ret < 0) { | |
544 | dev_err(master->dev, | |
545 | "<%s> cannot resume i3c bus master, err: %d\n", | |
546 | __func__, ret); | |
547 | return ret; | |
548 | } | |
549 | ||
dd3c5284 MR |
550 | /* Timings derivation */ |
551 | fclk_rate = clk_get_rate(master->fclk); | |
05be23ef CW |
552 | if (!fclk_rate) { |
553 | ret = -EINVAL; | |
554 | goto rpm_out; | |
555 | } | |
dd3c5284 MR |
556 | |
557 | fclk_period_ns = DIV_ROUND_UP(1000000000, fclk_rate); | |
558 | ||
559 | /* | |
560 | * Using I3C Push-Pull mode, target is 12.5MHz/80ns period. | |
561 | * Simplest configuration is using a 50% duty-cycle of 40ns. | |
562 | */ | |
563 | ppbaud = DIV_ROUND_UP(40, fclk_period_ns) - 1; | |
564 | pplow = 0; | |
565 | ||
566 | /* | |
567 | * Using I3C Open-Drain mode, target is 4.17MHz/240ns with a | |
568 | * duty-cycle tuned so that high levels are filetered out by | |
569 | * the 50ns filter (target being 40ns). | |
570 | */ | |
571 | odhpp = 1; | |
572 | high_period_ns = (ppbaud + 1) * fclk_period_ns; | |
573 | odbaud = DIV_ROUND_UP(240 - high_period_ns, high_period_ns) - 1; | |
574 | od_low_period_ns = (odbaud + 1) * high_period_ns; | |
575 | ||
576 | switch (bus->mode) { | |
577 | case I3C_BUS_MODE_PURE: | |
578 | i2cbaud = 0; | |
173fcb27 | 579 | odstop = 0; |
dd3c5284 MR |
580 | break; |
581 | case I3C_BUS_MODE_MIXED_FAST: | |
582 | case I3C_BUS_MODE_MIXED_LIMITED: | |
583 | /* | |
584 | * Using I2C Fm+ mode, target is 1MHz/1000ns, the difference | |
585 | * between the high and low period does not really matter. | |
586 | */ | |
587 | i2cbaud = DIV_ROUND_UP(1000, od_low_period_ns) - 2; | |
173fcb27 | 588 | odstop = 1; |
dd3c5284 MR |
589 | break; |
590 | case I3C_BUS_MODE_MIXED_SLOW: | |
591 | /* | |
592 | * Using I2C Fm mode, target is 0.4MHz/2500ns, with the same | |
593 | * constraints as the FM+ mode. | |
594 | */ | |
595 | i2cbaud = DIV_ROUND_UP(2500, od_low_period_ns) - 2; | |
173fcb27 | 596 | odstop = 1; |
dd3c5284 MR |
597 | break; |
598 | default: | |
05be23ef | 599 | goto rpm_out; |
dd3c5284 MR |
600 | } |
601 | ||
602 | reg = SVC_I3C_MCONFIG_MASTER_EN | | |
603 | SVC_I3C_MCONFIG_DISTO(0) | | |
604 | SVC_I3C_MCONFIG_HKEEP(0) | | |
173fcb27 | 605 | SVC_I3C_MCONFIG_ODSTOP(odstop) | |
dd3c5284 MR |
606 | SVC_I3C_MCONFIG_PPBAUD(ppbaud) | |
607 | SVC_I3C_MCONFIG_PPLOW(pplow) | | |
608 | SVC_I3C_MCONFIG_ODBAUD(odbaud) | | |
609 | SVC_I3C_MCONFIG_ODHPP(odhpp) | | |
610 | SVC_I3C_MCONFIG_SKEW(0) | | |
611 | SVC_I3C_MCONFIG_I2CBAUD(i2cbaud); | |
612 | writel(reg, master->regs + SVC_I3C_MCONFIG); | |
613 | ||
614 | /* Master core's registration */ | |
615 | ret = i3c_master_get_free_addr(m, 0); | |
616 | if (ret < 0) | |
05be23ef | 617 | goto rpm_out; |
dd3c5284 MR |
618 | |
619 | info.dyn_addr = ret; | |
620 | ||
621 | writel(SVC_MDYNADDR_VALID | SVC_MDYNADDR_ADDR(info.dyn_addr), | |
622 | master->regs + SVC_I3C_MDYNADDR); | |
623 | ||
624 | ret = i3c_master_set_info(&master->base, &info); | |
625 | if (ret) | |
05be23ef | 626 | goto rpm_out; |
dd3c5284 | 627 | |
05be23ef CW |
628 | rpm_out: |
629 | pm_runtime_mark_last_busy(master->dev); | |
630 | pm_runtime_put_autosuspend(master->dev); | |
631 | ||
632 | return ret; | |
dd3c5284 MR |
633 | } |
634 | ||
635 | static void svc_i3c_master_bus_cleanup(struct i3c_master_controller *m) | |
636 | { | |
637 | struct svc_i3c_master *master = to_svc_i3c_master(m); | |
05be23ef CW |
638 | int ret; |
639 | ||
640 | ret = pm_runtime_resume_and_get(master->dev); | |
641 | if (ret < 0) { | |
642 | dev_err(master->dev, "<%s> Cannot get runtime PM.\n", __func__); | |
643 | return; | |
644 | } | |
dd3c5284 MR |
645 | |
646 | svc_i3c_master_disable_interrupts(master); | |
647 | ||
648 | /* Disable master */ | |
649 | writel(0, master->regs + SVC_I3C_MCONFIG); | |
05be23ef CW |
650 | |
651 | pm_runtime_mark_last_busy(master->dev); | |
652 | pm_runtime_put_autosuspend(master->dev); | |
dd3c5284 MR |
653 | } |
654 | ||
655 | static int svc_i3c_master_reserve_slot(struct svc_i3c_master *master) | |
656 | { | |
657 | unsigned int slot; | |
658 | ||
659 | if (!(master->free_slots & GENMASK(SVC_I3C_MAX_DEVS - 1, 0))) | |
660 | return -ENOSPC; | |
661 | ||
662 | slot = ffs(master->free_slots) - 1; | |
663 | ||
664 | master->free_slots &= ~BIT(slot); | |
665 | ||
666 | return slot; | |
667 | } | |
668 | ||
669 | static void svc_i3c_master_release_slot(struct svc_i3c_master *master, | |
670 | unsigned int slot) | |
671 | { | |
672 | master->free_slots |= BIT(slot); | |
673 | } | |
674 | ||
675 | static int svc_i3c_master_attach_i3c_dev(struct i3c_dev_desc *dev) | |
676 | { | |
677 | struct i3c_master_controller *m = i3c_dev_get_master(dev); | |
678 | struct svc_i3c_master *master = to_svc_i3c_master(m); | |
679 | struct svc_i3c_i2c_dev_data *data; | |
680 | int slot; | |
681 | ||
682 | slot = svc_i3c_master_reserve_slot(master); | |
683 | if (slot < 0) | |
684 | return slot; | |
685 | ||
686 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
687 | if (!data) { | |
688 | svc_i3c_master_release_slot(master, slot); | |
689 | return -ENOMEM; | |
690 | } | |
691 | ||
692 | data->ibi = -1; | |
693 | data->index = slot; | |
694 | master->addrs[slot] = dev->info.dyn_addr ? dev->info.dyn_addr : | |
695 | dev->info.static_addr; | |
696 | master->descs[slot] = dev; | |
697 | ||
698 | i3c_dev_set_master_data(dev, data); | |
699 | ||
700 | return 0; | |
701 | } | |
702 | ||
703 | static int svc_i3c_master_reattach_i3c_dev(struct i3c_dev_desc *dev, | |
704 | u8 old_dyn_addr) | |
705 | { | |
706 | struct i3c_master_controller *m = i3c_dev_get_master(dev); | |
707 | struct svc_i3c_master *master = to_svc_i3c_master(m); | |
708 | struct svc_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev); | |
709 | ||
710 | master->addrs[data->index] = dev->info.dyn_addr ? dev->info.dyn_addr : | |
711 | dev->info.static_addr; | |
712 | ||
713 | return 0; | |
714 | } | |
715 | ||
716 | static void svc_i3c_master_detach_i3c_dev(struct i3c_dev_desc *dev) | |
717 | { | |
718 | struct svc_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev); | |
719 | struct i3c_master_controller *m = i3c_dev_get_master(dev); | |
720 | struct svc_i3c_master *master = to_svc_i3c_master(m); | |
721 | ||
722 | master->addrs[data->index] = 0; | |
723 | svc_i3c_master_release_slot(master, data->index); | |
724 | ||
725 | kfree(data); | |
726 | } | |
727 | ||
728 | static int svc_i3c_master_attach_i2c_dev(struct i2c_dev_desc *dev) | |
729 | { | |
730 | struct i3c_master_controller *m = i2c_dev_get_master(dev); | |
731 | struct svc_i3c_master *master = to_svc_i3c_master(m); | |
732 | struct svc_i3c_i2c_dev_data *data; | |
733 | int slot; | |
734 | ||
735 | slot = svc_i3c_master_reserve_slot(master); | |
736 | if (slot < 0) | |
737 | return slot; | |
738 | ||
739 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
740 | if (!data) { | |
741 | svc_i3c_master_release_slot(master, slot); | |
742 | return -ENOMEM; | |
743 | } | |
744 | ||
745 | data->index = slot; | |
746 | master->addrs[slot] = dev->addr; | |
747 | ||
748 | i2c_dev_set_master_data(dev, data); | |
749 | ||
750 | return 0; | |
751 | } | |
752 | ||
753 | static void svc_i3c_master_detach_i2c_dev(struct i2c_dev_desc *dev) | |
754 | { | |
755 | struct svc_i3c_i2c_dev_data *data = i2c_dev_get_master_data(dev); | |
756 | struct i3c_master_controller *m = i2c_dev_get_master(dev); | |
757 | struct svc_i3c_master *master = to_svc_i3c_master(m); | |
758 | ||
759 | svc_i3c_master_release_slot(master, data->index); | |
760 | ||
761 | kfree(data); | |
762 | } | |
763 | ||
764 | static int svc_i3c_master_readb(struct svc_i3c_master *master, u8 *dst, | |
765 | unsigned int len) | |
766 | { | |
767 | int ret, i; | |
768 | u32 reg; | |
769 | ||
770 | for (i = 0; i < len; i++) { | |
a84a9222 CW |
771 | ret = readl_poll_timeout_atomic(master->regs + SVC_I3C_MSTATUS, |
772 | reg, | |
773 | SVC_I3C_MSTATUS_RXPEND(reg), | |
774 | 0, 1000); | |
dd3c5284 MR |
775 | if (ret) |
776 | return ret; | |
777 | ||
778 | dst[i] = readl(master->regs + SVC_I3C_MRDATAB); | |
779 | } | |
780 | ||
781 | return 0; | |
782 | } | |
783 | ||
784 | static int svc_i3c_master_do_daa_locked(struct svc_i3c_master *master, | |
785 | u8 *addrs, unsigned int *count) | |
786 | { | |
787 | u64 prov_id[SVC_I3C_MAX_DEVS] = {}, nacking_prov_id = 0; | |
788 | unsigned int dev_nb = 0, last_addr = 0; | |
789 | u32 reg; | |
790 | int ret, i; | |
791 | ||
792 | while (true) { | |
793 | /* Enter/proceed with DAA */ | |
794 | writel(SVC_I3C_MCTRL_REQUEST_PROC_DAA | | |
795 | SVC_I3C_MCTRL_TYPE_I3C | | |
796 | SVC_I3C_MCTRL_IBIRESP_NACK | | |
797 | SVC_I3C_MCTRL_DIR(SVC_I3C_MCTRL_DIR_WRITE), | |
798 | master->regs + SVC_I3C_MCTRL); | |
799 | ||
800 | /* | |
801 | * Either one slave will send its ID, or the assignment process | |
802 | * is done. | |
803 | */ | |
a84a9222 CW |
804 | ret = readl_poll_timeout_atomic(master->regs + SVC_I3C_MSTATUS, |
805 | reg, | |
806 | SVC_I3C_MSTATUS_RXPEND(reg) | | |
807 | SVC_I3C_MSTATUS_MCTRLDONE(reg), | |
808 | 1, 1000); | |
dd3c5284 MR |
809 | if (ret) |
810 | return ret; | |
811 | ||
812 | if (SVC_I3C_MSTATUS_RXPEND(reg)) { | |
813 | u8 data[6]; | |
814 | ||
815 | /* | |
57ec42b9 | 816 | * We only care about the 48-bit provisioned ID yet to |
dd3c5284 MR |
817 | * be sure a device does not nack an address twice. |
818 | * Otherwise, we would just need to flush the RX FIFO. | |
819 | */ | |
820 | ret = svc_i3c_master_readb(master, data, 6); | |
821 | if (ret) | |
822 | return ret; | |
823 | ||
824 | for (i = 0; i < 6; i++) | |
825 | prov_id[dev_nb] |= (u64)(data[i]) << (8 * (5 - i)); | |
826 | ||
827 | /* We do not care about the BCR and DCR yet */ | |
828 | ret = svc_i3c_master_readb(master, data, 2); | |
829 | if (ret) | |
830 | return ret; | |
831 | } else if (SVC_I3C_MSTATUS_MCTRLDONE(reg)) { | |
832 | if (SVC_I3C_MSTATUS_STATE_IDLE(reg) && | |
833 | SVC_I3C_MSTATUS_COMPLETE(reg)) { | |
834 | /* | |
835 | * All devices received and acked they dynamic | |
836 | * address, this is the natural end of the DAA | |
837 | * procedure. | |
838 | */ | |
839 | break; | |
840 | } else if (SVC_I3C_MSTATUS_NACKED(reg)) { | |
6e13d652 FL |
841 | /* No I3C devices attached */ |
842 | if (dev_nb == 0) | |
843 | break; | |
844 | ||
dd3c5284 MR |
845 | /* |
846 | * A slave device nacked the address, this is | |
847 | * allowed only once, DAA will be stopped and | |
848 | * then resumed. The same device is supposed to | |
849 | * answer again immediately and shall ack the | |
850 | * address this time. | |
851 | */ | |
852 | if (prov_id[dev_nb] == nacking_prov_id) | |
853 | return -EIO; | |
854 | ||
855 | dev_nb--; | |
856 | nacking_prov_id = prov_id[dev_nb]; | |
857 | svc_i3c_master_emit_stop(master); | |
858 | ||
859 | continue; | |
860 | } else { | |
861 | return -EIO; | |
862 | } | |
863 | } | |
864 | ||
865 | /* Wait for the slave to be ready to receive its address */ | |
a84a9222 CW |
866 | ret = readl_poll_timeout_atomic(master->regs + SVC_I3C_MSTATUS, |
867 | reg, | |
868 | SVC_I3C_MSTATUS_MCTRLDONE(reg) && | |
869 | SVC_I3C_MSTATUS_STATE_DAA(reg) && | |
870 | SVC_I3C_MSTATUS_BETWEEN(reg), | |
871 | 0, 1000); | |
dd3c5284 MR |
872 | if (ret) |
873 | return ret; | |
874 | ||
875 | /* Give the slave device a suitable dynamic address */ | |
876 | ret = i3c_master_get_free_addr(&master->base, last_addr + 1); | |
877 | if (ret < 0) | |
878 | return ret; | |
879 | ||
880 | addrs[dev_nb] = ret; | |
881 | dev_dbg(master->dev, "DAA: device %d assigned to 0x%02x\n", | |
882 | dev_nb, addrs[dev_nb]); | |
883 | ||
884 | writel(addrs[dev_nb], master->regs + SVC_I3C_MWDATAB); | |
885 | last_addr = addrs[dev_nb++]; | |
886 | } | |
887 | ||
888 | *count = dev_nb; | |
889 | ||
890 | return 0; | |
891 | } | |
892 | ||
893 | static int svc_i3c_update_ibirules(struct svc_i3c_master *master) | |
894 | { | |
895 | struct i3c_dev_desc *dev; | |
896 | u32 reg_mbyte = 0, reg_nobyte = SVC_I3C_IBIRULES_NOBYTE; | |
897 | unsigned int mbyte_addr_ok = 0, mbyte_addr_ko = 0, nobyte_addr_ok = 0, | |
898 | nobyte_addr_ko = 0; | |
899 | bool list_mbyte = false, list_nobyte = false; | |
900 | ||
901 | /* Create the IBIRULES register for both cases */ | |
902 | i3c_bus_for_each_i3cdev(&master->base.bus, dev) { | |
903 | if (I3C_BCR_DEVICE_ROLE(dev->info.bcr) == I3C_BCR_I3C_MASTER) | |
904 | continue; | |
905 | ||
906 | if (dev->info.bcr & I3C_BCR_IBI_PAYLOAD) { | |
907 | reg_mbyte |= SVC_I3C_IBIRULES_ADDR(mbyte_addr_ok, | |
908 | dev->info.dyn_addr); | |
909 | ||
910 | /* IBI rules cannot be applied to devices with MSb=1 */ | |
911 | if (dev->info.dyn_addr & BIT(7)) | |
912 | mbyte_addr_ko++; | |
913 | else | |
914 | mbyte_addr_ok++; | |
915 | } else { | |
916 | reg_nobyte |= SVC_I3C_IBIRULES_ADDR(nobyte_addr_ok, | |
917 | dev->info.dyn_addr); | |
918 | ||
919 | /* IBI rules cannot be applied to devices with MSb=1 */ | |
920 | if (dev->info.dyn_addr & BIT(7)) | |
921 | nobyte_addr_ko++; | |
922 | else | |
923 | nobyte_addr_ok++; | |
924 | } | |
925 | } | |
926 | ||
927 | /* Device list cannot be handled by hardware */ | |
928 | if (!mbyte_addr_ko && mbyte_addr_ok <= SVC_I3C_IBIRULES_ADDRS) | |
929 | list_mbyte = true; | |
930 | ||
931 | if (!nobyte_addr_ko && nobyte_addr_ok <= SVC_I3C_IBIRULES_ADDRS) | |
932 | list_nobyte = true; | |
933 | ||
934 | /* No list can be properly handled, return an error */ | |
935 | if (!list_mbyte && !list_nobyte) | |
936 | return -ERANGE; | |
937 | ||
938 | /* Pick the first list that can be handled by hardware, randomly */ | |
939 | if (list_mbyte) | |
940 | writel(reg_mbyte, master->regs + SVC_I3C_IBIRULES); | |
941 | else | |
942 | writel(reg_nobyte, master->regs + SVC_I3C_IBIRULES); | |
943 | ||
944 | return 0; | |
945 | } | |
946 | ||
947 | static int svc_i3c_master_do_daa(struct i3c_master_controller *m) | |
948 | { | |
949 | struct svc_i3c_master *master = to_svc_i3c_master(m); | |
950 | u8 addrs[SVC_I3C_MAX_DEVS]; | |
951 | unsigned long flags; | |
952 | unsigned int dev_nb; | |
953 | int ret, i; | |
954 | ||
05be23ef CW |
955 | ret = pm_runtime_resume_and_get(master->dev); |
956 | if (ret < 0) { | |
957 | dev_err(master->dev, "<%s> Cannot get runtime PM.\n", __func__); | |
958 | return ret; | |
959 | } | |
960 | ||
dd3c5284 MR |
961 | spin_lock_irqsave(&master->xferqueue.lock, flags); |
962 | ret = svc_i3c_master_do_daa_locked(master, addrs, &dev_nb); | |
963 | spin_unlock_irqrestore(&master->xferqueue.lock, flags); | |
05be23ef CW |
964 | if (ret) { |
965 | svc_i3c_master_emit_stop(master); | |
966 | svc_i3c_master_clear_merrwarn(master); | |
967 | goto rpm_out; | |
968 | } | |
dd3c5284 MR |
969 | |
970 | /* Register all devices who participated to the core */ | |
971 | for (i = 0; i < dev_nb; i++) { | |
972 | ret = i3c_master_add_i3c_dev_locked(m, addrs[i]); | |
973 | if (ret) | |
05be23ef | 974 | goto rpm_out; |
dd3c5284 MR |
975 | } |
976 | ||
977 | /* Configure IBI auto-rules */ | |
978 | ret = svc_i3c_update_ibirules(master); | |
05be23ef | 979 | if (ret) |
dd3c5284 | 980 | dev_err(master->dev, "Cannot handle such a list of devices"); |
dd3c5284 | 981 | |
05be23ef CW |
982 | rpm_out: |
983 | pm_runtime_mark_last_busy(master->dev); | |
984 | pm_runtime_put_autosuspend(master->dev); | |
dd3c5284 MR |
985 | |
986 | return ret; | |
987 | } | |
988 | ||
989 | static int svc_i3c_master_read(struct svc_i3c_master *master, | |
990 | u8 *in, unsigned int len) | |
991 | { | |
d5e51257 CW |
992 | int offset = 0, i; |
993 | u32 mdctrl, mstatus; | |
994 | bool completed = false; | |
995 | unsigned int count; | |
996 | unsigned long start = jiffies; | |
dd3c5284 | 997 | |
d5e51257 CW |
998 | while (!completed) { |
999 | mstatus = readl(master->regs + SVC_I3C_MSTATUS); | |
1000 | if (SVC_I3C_MSTATUS_COMPLETE(mstatus) != 0) | |
1001 | completed = true; | |
dd3c5284 | 1002 | |
d5e51257 CW |
1003 | if (time_after(jiffies, start + msecs_to_jiffies(1000))) { |
1004 | dev_dbg(master->dev, "I3C read timeout\n"); | |
1005 | return -ETIMEDOUT; | |
1006 | } | |
dd3c5284 | 1007 | |
d5e51257 | 1008 | mdctrl = readl(master->regs + SVC_I3C_MDATACTRL); |
dd3c5284 | 1009 | count = SVC_I3C_MDATACTRL_RXCOUNT(mdctrl); |
d5e51257 CW |
1010 | if (offset + count > len) { |
1011 | dev_err(master->dev, "I3C receive length too long!\n"); | |
1012 | return -EINVAL; | |
1013 | } | |
dd3c5284 MR |
1014 | for (i = 0; i < count; i++) |
1015 | in[offset + i] = readl(master->regs + SVC_I3C_MRDATAB); | |
1016 | ||
1017 | offset += count; | |
1018 | } | |
1019 | ||
d5e51257 | 1020 | return offset; |
dd3c5284 MR |
1021 | } |
1022 | ||
1023 | static int svc_i3c_master_write(struct svc_i3c_master *master, | |
1024 | const u8 *out, unsigned int len) | |
1025 | { | |
1026 | int offset = 0, ret; | |
1027 | u32 mdctrl; | |
1028 | ||
1029 | while (offset < len) { | |
1030 | ret = readl_poll_timeout(master->regs + SVC_I3C_MDATACTRL, | |
1031 | mdctrl, | |
1032 | !(mdctrl & SVC_I3C_MDATACTRL_TXFULL), | |
1033 | 0, 1000); | |
1034 | if (ret) | |
1035 | return ret; | |
1036 | ||
1037 | /* | |
1038 | * The last byte to be sent over the bus must either have the | |
1039 | * "end" bit set or be written in MWDATABE. | |
1040 | */ | |
1041 | if (likely(offset < (len - 1))) | |
1042 | writel(out[offset++], master->regs + SVC_I3C_MWDATAB); | |
1043 | else | |
1044 | writel(out[offset++], master->regs + SVC_I3C_MWDATABE); | |
1045 | } | |
1046 | ||
1047 | return 0; | |
1048 | } | |
1049 | ||
1050 | static int svc_i3c_master_xfer(struct svc_i3c_master *master, | |
1051 | bool rnw, unsigned int xfer_type, u8 addr, | |
1052 | u8 *in, const u8 *out, unsigned int xfer_len, | |
6fb61734 | 1053 | unsigned int *actual_len, bool continued) |
dd3c5284 MR |
1054 | { |
1055 | u32 reg; | |
1056 | int ret; | |
1057 | ||
5e5e3c92 FL |
1058 | /* clean SVC_I3C_MINT_IBIWON w1c bits */ |
1059 | writel(SVC_I3C_MINT_IBIWON, master->regs + SVC_I3C_MSTATUS); | |
1060 | ||
dd3c5284 MR |
1061 | writel(SVC_I3C_MCTRL_REQUEST_START_ADDR | |
1062 | xfer_type | | |
1063 | SVC_I3C_MCTRL_IBIRESP_NACK | | |
1064 | SVC_I3C_MCTRL_DIR(rnw) | | |
1065 | SVC_I3C_MCTRL_ADDR(addr) | | |
6fb61734 | 1066 | SVC_I3C_MCTRL_RDTERM(*actual_len), |
dd3c5284 MR |
1067 | master->regs + SVC_I3C_MCTRL); |
1068 | ||
1069 | ret = readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg, | |
1070 | SVC_I3C_MSTATUS_MCTRLDONE(reg), 0, 1000); | |
1071 | if (ret) | |
1072 | goto emit_stop; | |
1073 | ||
49b472eb CW |
1074 | if (readl(master->regs + SVC_I3C_MERRWARN) & SVC_I3C_MERRWARN_NACK) { |
1075 | ret = -ENXIO; | |
6d1a19d3 | 1076 | *actual_len = 0; |
49b472eb CW |
1077 | goto emit_stop; |
1078 | } | |
1079 | ||
5e5e3c92 FL |
1080 | /* |
1081 | * According to I3C spec ver 1.1.1, 5.1.2.2.3 Consequence of Controller Starting a Frame | |
1082 | * with I3C Target Address. | |
1083 | * | |
1084 | * The I3C Controller normally should start a Frame, the Address may be arbitrated, and so | |
1085 | * the Controller shall monitor to see whether an In-Band Interrupt request, a Controller | |
1086 | * Role Request (i.e., Secondary Controller requests to become the Active Controller), or | |
1087 | * a Hot-Join Request has been made. | |
1088 | * | |
1089 | * If missed IBIWON check, the wrong data will be return. When IBIWON happen, return failure | |
1090 | * and yield the above events handler. | |
1091 | */ | |
1092 | if (SVC_I3C_MSTATUS_IBIWON(reg)) { | |
7f3d633b | 1093 | ret = -EAGAIN; |
6d1a19d3 | 1094 | *actual_len = 0; |
5e5e3c92 FL |
1095 | goto emit_stop; |
1096 | } | |
1097 | ||
dd3c5284 MR |
1098 | if (rnw) |
1099 | ret = svc_i3c_master_read(master, in, xfer_len); | |
1100 | else | |
1101 | ret = svc_i3c_master_write(master, out, xfer_len); | |
d5e51257 | 1102 | if (ret < 0) |
dd3c5284 MR |
1103 | goto emit_stop; |
1104 | ||
d5e51257 | 1105 | if (rnw) |
6fb61734 | 1106 | *actual_len = ret; |
d5e51257 | 1107 | |
dd3c5284 MR |
1108 | ret = readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg, |
1109 | SVC_I3C_MSTATUS_COMPLETE(reg), 0, 1000); | |
1110 | if (ret) | |
1111 | goto emit_stop; | |
1112 | ||
d5e51257 CW |
1113 | writel(SVC_I3C_MINT_COMPLETE, master->regs + SVC_I3C_MSTATUS); |
1114 | ||
1115 | if (!continued) { | |
dd3c5284 MR |
1116 | svc_i3c_master_emit_stop(master); |
1117 | ||
d5e51257 CW |
1118 | /* Wait idle if stop is sent. */ |
1119 | readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg, | |
1120 | SVC_I3C_MSTATUS_STATE_IDLE(reg), 0, 1000); | |
1121 | } | |
1122 | ||
dd3c5284 MR |
1123 | return 0; |
1124 | ||
1125 | emit_stop: | |
1126 | svc_i3c_master_emit_stop(master); | |
1127 | svc_i3c_master_clear_merrwarn(master); | |
1128 | ||
1129 | return ret; | |
1130 | } | |
1131 | ||
1132 | static struct svc_i3c_xfer * | |
1133 | svc_i3c_master_alloc_xfer(struct svc_i3c_master *master, unsigned int ncmds) | |
1134 | { | |
1135 | struct svc_i3c_xfer *xfer; | |
1136 | ||
1137 | xfer = kzalloc(struct_size(xfer, cmds, ncmds), GFP_KERNEL); | |
1138 | if (!xfer) | |
1139 | return NULL; | |
1140 | ||
1141 | INIT_LIST_HEAD(&xfer->node); | |
1142 | xfer->ncmds = ncmds; | |
1143 | xfer->ret = -ETIMEDOUT; | |
1144 | ||
1145 | return xfer; | |
1146 | } | |
1147 | ||
1148 | static void svc_i3c_master_free_xfer(struct svc_i3c_xfer *xfer) | |
1149 | { | |
1150 | kfree(xfer); | |
1151 | } | |
1152 | ||
1153 | static void svc_i3c_master_dequeue_xfer_locked(struct svc_i3c_master *master, | |
1154 | struct svc_i3c_xfer *xfer) | |
1155 | { | |
1156 | if (master->xferqueue.cur == xfer) | |
1157 | master->xferqueue.cur = NULL; | |
1158 | else | |
1159 | list_del_init(&xfer->node); | |
1160 | } | |
1161 | ||
1162 | static void svc_i3c_master_dequeue_xfer(struct svc_i3c_master *master, | |
1163 | struct svc_i3c_xfer *xfer) | |
1164 | { | |
1165 | unsigned long flags; | |
1166 | ||
1167 | spin_lock_irqsave(&master->xferqueue.lock, flags); | |
1168 | svc_i3c_master_dequeue_xfer_locked(master, xfer); | |
1169 | spin_unlock_irqrestore(&master->xferqueue.lock, flags); | |
1170 | } | |
1171 | ||
1172 | static void svc_i3c_master_start_xfer_locked(struct svc_i3c_master *master) | |
1173 | { | |
1174 | struct svc_i3c_xfer *xfer = master->xferqueue.cur; | |
1175 | int ret, i; | |
1176 | ||
1177 | if (!xfer) | |
1178 | return; | |
1179 | ||
d5e51257 CW |
1180 | svc_i3c_master_clear_merrwarn(master); |
1181 | svc_i3c_master_flush_fifo(master); | |
1182 | ||
dd3c5284 MR |
1183 | for (i = 0; i < xfer->ncmds; i++) { |
1184 | struct svc_i3c_cmd *cmd = &xfer->cmds[i]; | |
1185 | ||
1186 | ret = svc_i3c_master_xfer(master, cmd->rnw, xfer->type, | |
1187 | cmd->addr, cmd->in, cmd->out, | |
6fb61734 | 1188 | cmd->len, &cmd->actual_len, |
dd3c5284 | 1189 | cmd->continued); |
6d1a19d3 FL |
1190 | /* cmd->xfer is NULL if I2C or CCC transfer */ |
1191 | if (cmd->xfer) | |
1192 | cmd->xfer->actual_len = cmd->actual_len; | |
1193 | ||
dd3c5284 MR |
1194 | if (ret) |
1195 | break; | |
1196 | } | |
1197 | ||
1198 | xfer->ret = ret; | |
1199 | complete(&xfer->comp); | |
1200 | ||
1201 | if (ret < 0) | |
1202 | svc_i3c_master_dequeue_xfer_locked(master, xfer); | |
1203 | ||
1204 | xfer = list_first_entry_or_null(&master->xferqueue.list, | |
1205 | struct svc_i3c_xfer, | |
1206 | node); | |
1207 | if (xfer) | |
1208 | list_del_init(&xfer->node); | |
1209 | ||
1210 | master->xferqueue.cur = xfer; | |
1211 | svc_i3c_master_start_xfer_locked(master); | |
1212 | } | |
1213 | ||
1214 | static void svc_i3c_master_enqueue_xfer(struct svc_i3c_master *master, | |
1215 | struct svc_i3c_xfer *xfer) | |
1216 | { | |
1217 | unsigned long flags; | |
33beadb3 CW |
1218 | int ret; |
1219 | ||
1220 | ret = pm_runtime_resume_and_get(master->dev); | |
1221 | if (ret < 0) { | |
1222 | dev_err(master->dev, "<%s> Cannot get runtime PM.\n", __func__); | |
1223 | return; | |
1224 | } | |
dd3c5284 MR |
1225 | |
1226 | init_completion(&xfer->comp); | |
1227 | spin_lock_irqsave(&master->xferqueue.lock, flags); | |
1228 | if (master->xferqueue.cur) { | |
1229 | list_add_tail(&xfer->node, &master->xferqueue.list); | |
1230 | } else { | |
1231 | master->xferqueue.cur = xfer; | |
1232 | svc_i3c_master_start_xfer_locked(master); | |
1233 | } | |
1234 | spin_unlock_irqrestore(&master->xferqueue.lock, flags); | |
33beadb3 CW |
1235 | |
1236 | pm_runtime_mark_last_busy(master->dev); | |
1237 | pm_runtime_put_autosuspend(master->dev); | |
dd3c5284 MR |
1238 | } |
1239 | ||
1240 | static bool | |
1241 | svc_i3c_master_supports_ccc_cmd(struct i3c_master_controller *master, | |
1242 | const struct i3c_ccc_cmd *cmd) | |
1243 | { | |
1244 | /* No software support for CCC commands targeting more than one slave */ | |
1245 | return (cmd->ndests == 1); | |
1246 | } | |
1247 | ||
1248 | static int svc_i3c_master_send_bdcast_ccc_cmd(struct svc_i3c_master *master, | |
1249 | struct i3c_ccc_cmd *ccc) | |
1250 | { | |
1251 | unsigned int xfer_len = ccc->dests[0].payload.len + 1; | |
1252 | struct svc_i3c_xfer *xfer; | |
1253 | struct svc_i3c_cmd *cmd; | |
1254 | u8 *buf; | |
1255 | int ret; | |
1256 | ||
1257 | xfer = svc_i3c_master_alloc_xfer(master, 1); | |
1258 | if (!xfer) | |
1259 | return -ENOMEM; | |
1260 | ||
1261 | buf = kmalloc(xfer_len, GFP_KERNEL); | |
1262 | if (!buf) { | |
1263 | svc_i3c_master_free_xfer(xfer); | |
1264 | return -ENOMEM; | |
1265 | } | |
1266 | ||
1267 | buf[0] = ccc->id; | |
1268 | memcpy(&buf[1], ccc->dests[0].payload.data, ccc->dests[0].payload.len); | |
1269 | ||
1270 | xfer->type = SVC_I3C_MCTRL_TYPE_I3C; | |
1271 | ||
1272 | cmd = &xfer->cmds[0]; | |
1273 | cmd->addr = ccc->dests[0].addr; | |
1274 | cmd->rnw = ccc->rnw; | |
1275 | cmd->in = NULL; | |
1276 | cmd->out = buf; | |
1277 | cmd->len = xfer_len; | |
6fb61734 | 1278 | cmd->actual_len = 0; |
dd3c5284 MR |
1279 | cmd->continued = false; |
1280 | ||
6bf3fc26 | 1281 | mutex_lock(&master->lock); |
dd3c5284 MR |
1282 | svc_i3c_master_enqueue_xfer(master, xfer); |
1283 | if (!wait_for_completion_timeout(&xfer->comp, msecs_to_jiffies(1000))) | |
1284 | svc_i3c_master_dequeue_xfer(master, xfer); | |
6bf3fc26 | 1285 | mutex_unlock(&master->lock); |
dd3c5284 MR |
1286 | |
1287 | ret = xfer->ret; | |
1288 | kfree(buf); | |
1289 | svc_i3c_master_free_xfer(xfer); | |
1290 | ||
1291 | return ret; | |
1292 | } | |
1293 | ||
1294 | static int svc_i3c_master_send_direct_ccc_cmd(struct svc_i3c_master *master, | |
1295 | struct i3c_ccc_cmd *ccc) | |
1296 | { | |
1297 | unsigned int xfer_len = ccc->dests[0].payload.len; | |
6fb61734 | 1298 | unsigned int actual_len = ccc->rnw ? xfer_len : 0; |
dd3c5284 MR |
1299 | struct svc_i3c_xfer *xfer; |
1300 | struct svc_i3c_cmd *cmd; | |
1301 | int ret; | |
1302 | ||
1303 | xfer = svc_i3c_master_alloc_xfer(master, 2); | |
1304 | if (!xfer) | |
1305 | return -ENOMEM; | |
1306 | ||
1307 | xfer->type = SVC_I3C_MCTRL_TYPE_I3C; | |
1308 | ||
1309 | /* Broadcasted message */ | |
1310 | cmd = &xfer->cmds[0]; | |
1311 | cmd->addr = I3C_BROADCAST_ADDR; | |
1312 | cmd->rnw = 0; | |
1313 | cmd->in = NULL; | |
1314 | cmd->out = &ccc->id; | |
1315 | cmd->len = 1; | |
6fb61734 | 1316 | cmd->actual_len = 0; |
dd3c5284 MR |
1317 | cmd->continued = true; |
1318 | ||
1319 | /* Directed message */ | |
1320 | cmd = &xfer->cmds[1]; | |
1321 | cmd->addr = ccc->dests[0].addr; | |
1322 | cmd->rnw = ccc->rnw; | |
1323 | cmd->in = ccc->rnw ? ccc->dests[0].payload.data : NULL; | |
1324 | cmd->out = ccc->rnw ? NULL : ccc->dests[0].payload.data, | |
1325 | cmd->len = xfer_len; | |
6fb61734 | 1326 | cmd->actual_len = actual_len; |
dd3c5284 MR |
1327 | cmd->continued = false; |
1328 | ||
6bf3fc26 | 1329 | mutex_lock(&master->lock); |
dd3c5284 MR |
1330 | svc_i3c_master_enqueue_xfer(master, xfer); |
1331 | if (!wait_for_completion_timeout(&xfer->comp, msecs_to_jiffies(1000))) | |
1332 | svc_i3c_master_dequeue_xfer(master, xfer); | |
6bf3fc26 | 1333 | mutex_unlock(&master->lock); |
dd3c5284 | 1334 | |
6fb61734 FL |
1335 | if (cmd->actual_len != xfer_len) |
1336 | ccc->dests[0].payload.len = cmd->actual_len; | |
d5e51257 | 1337 | |
dd3c5284 MR |
1338 | ret = xfer->ret; |
1339 | svc_i3c_master_free_xfer(xfer); | |
1340 | ||
1341 | return ret; | |
1342 | } | |
1343 | ||
1344 | static int svc_i3c_master_send_ccc_cmd(struct i3c_master_controller *m, | |
1345 | struct i3c_ccc_cmd *cmd) | |
1346 | { | |
1347 | struct svc_i3c_master *master = to_svc_i3c_master(m); | |
1348 | bool broadcast = cmd->id < 0x80; | |
6e13d652 | 1349 | int ret; |
dd3c5284 MR |
1350 | |
1351 | if (broadcast) | |
6e13d652 | 1352 | ret = svc_i3c_master_send_bdcast_ccc_cmd(master, cmd); |
dd3c5284 | 1353 | else |
6e13d652 FL |
1354 | ret = svc_i3c_master_send_direct_ccc_cmd(master, cmd); |
1355 | ||
1356 | if (ret) | |
1357 | cmd->err = I3C_ERROR_M2; | |
1358 | ||
1359 | return ret; | |
dd3c5284 MR |
1360 | } |
1361 | ||
1362 | static int svc_i3c_master_priv_xfers(struct i3c_dev_desc *dev, | |
1363 | struct i3c_priv_xfer *xfers, | |
1364 | int nxfers) | |
1365 | { | |
1366 | struct i3c_master_controller *m = i3c_dev_get_master(dev); | |
1367 | struct svc_i3c_master *master = to_svc_i3c_master(m); | |
1368 | struct svc_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev); | |
1369 | struct svc_i3c_xfer *xfer; | |
1370 | int ret, i; | |
1371 | ||
1372 | xfer = svc_i3c_master_alloc_xfer(master, nxfers); | |
1373 | if (!xfer) | |
1374 | return -ENOMEM; | |
1375 | ||
1376 | xfer->type = SVC_I3C_MCTRL_TYPE_I3C; | |
1377 | ||
1378 | for (i = 0; i < nxfers; i++) { | |
1379 | struct svc_i3c_cmd *cmd = &xfer->cmds[i]; | |
1380 | ||
6d1a19d3 | 1381 | cmd->xfer = &xfers[i]; |
dd3c5284 MR |
1382 | cmd->addr = master->addrs[data->index]; |
1383 | cmd->rnw = xfers[i].rnw; | |
1384 | cmd->in = xfers[i].rnw ? xfers[i].data.in : NULL; | |
1385 | cmd->out = xfers[i].rnw ? NULL : xfers[i].data.out; | |
1386 | cmd->len = xfers[i].len; | |
6fb61734 | 1387 | cmd->actual_len = xfers[i].rnw ? xfers[i].len : 0; |
dd3c5284 MR |
1388 | cmd->continued = (i + 1) < nxfers; |
1389 | } | |
1390 | ||
6bf3fc26 | 1391 | mutex_lock(&master->lock); |
dd3c5284 MR |
1392 | svc_i3c_master_enqueue_xfer(master, xfer); |
1393 | if (!wait_for_completion_timeout(&xfer->comp, msecs_to_jiffies(1000))) | |
1394 | svc_i3c_master_dequeue_xfer(master, xfer); | |
6bf3fc26 | 1395 | mutex_unlock(&master->lock); |
dd3c5284 MR |
1396 | |
1397 | ret = xfer->ret; | |
1398 | svc_i3c_master_free_xfer(xfer); | |
1399 | ||
1400 | return ret; | |
1401 | } | |
1402 | ||
1403 | static int svc_i3c_master_i2c_xfers(struct i2c_dev_desc *dev, | |
1404 | const struct i2c_msg *xfers, | |
1405 | int nxfers) | |
1406 | { | |
1407 | struct i3c_master_controller *m = i2c_dev_get_master(dev); | |
1408 | struct svc_i3c_master *master = to_svc_i3c_master(m); | |
1409 | struct svc_i3c_i2c_dev_data *data = i2c_dev_get_master_data(dev); | |
1410 | struct svc_i3c_xfer *xfer; | |
1411 | int ret, i; | |
1412 | ||
1413 | xfer = svc_i3c_master_alloc_xfer(master, nxfers); | |
1414 | if (!xfer) | |
1415 | return -ENOMEM; | |
1416 | ||
1417 | xfer->type = SVC_I3C_MCTRL_TYPE_I2C; | |
1418 | ||
1419 | for (i = 0; i < nxfers; i++) { | |
1420 | struct svc_i3c_cmd *cmd = &xfer->cmds[i]; | |
1421 | ||
1422 | cmd->addr = master->addrs[data->index]; | |
1423 | cmd->rnw = xfers[i].flags & I2C_M_RD; | |
1424 | cmd->in = cmd->rnw ? xfers[i].buf : NULL; | |
1425 | cmd->out = cmd->rnw ? NULL : xfers[i].buf; | |
1426 | cmd->len = xfers[i].len; | |
6fb61734 | 1427 | cmd->actual_len = cmd->rnw ? xfers[i].len : 0; |
dd3c5284 MR |
1428 | cmd->continued = (i + 1 < nxfers); |
1429 | } | |
1430 | ||
6bf3fc26 | 1431 | mutex_lock(&master->lock); |
dd3c5284 MR |
1432 | svc_i3c_master_enqueue_xfer(master, xfer); |
1433 | if (!wait_for_completion_timeout(&xfer->comp, msecs_to_jiffies(1000))) | |
1434 | svc_i3c_master_dequeue_xfer(master, xfer); | |
6bf3fc26 | 1435 | mutex_unlock(&master->lock); |
dd3c5284 MR |
1436 | |
1437 | ret = xfer->ret; | |
1438 | svc_i3c_master_free_xfer(xfer); | |
1439 | ||
1440 | return ret; | |
1441 | } | |
1442 | ||
1443 | static int svc_i3c_master_request_ibi(struct i3c_dev_desc *dev, | |
1444 | const struct i3c_ibi_setup *req) | |
1445 | { | |
1446 | struct i3c_master_controller *m = i3c_dev_get_master(dev); | |
1447 | struct svc_i3c_master *master = to_svc_i3c_master(m); | |
1448 | struct svc_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev); | |
1449 | unsigned long flags; | |
1450 | unsigned int i; | |
1451 | ||
1452 | if (dev->ibi->max_payload_len > SVC_I3C_FIFO_SIZE) { | |
1453 | dev_err(master->dev, "IBI max payload %d should be < %d\n", | |
1454 | dev->ibi->max_payload_len, SVC_I3C_FIFO_SIZE); | |
1455 | return -ERANGE; | |
1456 | } | |
1457 | ||
1458 | data->ibi_pool = i3c_generic_ibi_alloc_pool(dev, req); | |
1459 | if (IS_ERR(data->ibi_pool)) | |
1460 | return PTR_ERR(data->ibi_pool); | |
1461 | ||
1462 | spin_lock_irqsave(&master->ibi.lock, flags); | |
1463 | for (i = 0; i < master->ibi.num_slots; i++) { | |
1464 | if (!master->ibi.slots[i]) { | |
1465 | data->ibi = i; | |
1466 | master->ibi.slots[i] = dev; | |
1467 | break; | |
1468 | } | |
1469 | } | |
1470 | spin_unlock_irqrestore(&master->ibi.lock, flags); | |
1471 | ||
1472 | if (i < master->ibi.num_slots) | |
1473 | return 0; | |
1474 | ||
1475 | i3c_generic_ibi_free_pool(data->ibi_pool); | |
1476 | data->ibi_pool = NULL; | |
1477 | ||
1478 | return -ENOSPC; | |
1479 | } | |
1480 | ||
1481 | static void svc_i3c_master_free_ibi(struct i3c_dev_desc *dev) | |
1482 | { | |
1483 | struct i3c_master_controller *m = i3c_dev_get_master(dev); | |
1484 | struct svc_i3c_master *master = to_svc_i3c_master(m); | |
1485 | struct svc_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev); | |
1486 | unsigned long flags; | |
1487 | ||
1488 | spin_lock_irqsave(&master->ibi.lock, flags); | |
1489 | master->ibi.slots[data->ibi] = NULL; | |
1490 | data->ibi = -1; | |
1491 | spin_unlock_irqrestore(&master->ibi.lock, flags); | |
1492 | ||
1493 | i3c_generic_ibi_free_pool(data->ibi_pool); | |
1494 | } | |
1495 | ||
1496 | static int svc_i3c_master_enable_ibi(struct i3c_dev_desc *dev) | |
1497 | { | |
1498 | struct i3c_master_controller *m = i3c_dev_get_master(dev); | |
05be23ef CW |
1499 | struct svc_i3c_master *master = to_svc_i3c_master(m); |
1500 | int ret; | |
1501 | ||
1502 | ret = pm_runtime_resume_and_get(master->dev); | |
1503 | if (ret < 0) { | |
1504 | dev_err(master->dev, "<%s> Cannot get runtime PM.\n", __func__); | |
1505 | return ret; | |
1506 | } | |
dd3c5284 | 1507 | |
05b26c31 | 1508 | master->enabled_events |= SVC_I3C_EVENT_IBI; |
7ff730ca CW |
1509 | svc_i3c_master_enable_interrupts(master, SVC_I3C_MINT_SLVSTART); |
1510 | ||
dd3c5284 MR |
1511 | return i3c_master_enec_locked(m, dev->info.dyn_addr, I3C_CCC_EVENT_SIR); |
1512 | } | |
1513 | ||
1514 | static int svc_i3c_master_disable_ibi(struct i3c_dev_desc *dev) | |
1515 | { | |
1516 | struct i3c_master_controller *m = i3c_dev_get_master(dev); | |
05be23ef CW |
1517 | struct svc_i3c_master *master = to_svc_i3c_master(m); |
1518 | int ret; | |
1519 | ||
05b26c31 FL |
1520 | master->enabled_events &= ~SVC_I3C_EVENT_IBI; |
1521 | if (!master->enabled_events) | |
1522 | svc_i3c_master_disable_interrupts(master); | |
7ff730ca | 1523 | |
05be23ef | 1524 | ret = i3c_master_disec_locked(m, dev->info.dyn_addr, I3C_CCC_EVENT_SIR); |
dd3c5284 | 1525 | |
05be23ef CW |
1526 | pm_runtime_mark_last_busy(master->dev); |
1527 | pm_runtime_put_autosuspend(master->dev); | |
1528 | ||
1529 | return ret; | |
dd3c5284 MR |
1530 | } |
1531 | ||
05b26c31 FL |
1532 | static int svc_i3c_master_enable_hotjoin(struct i3c_master_controller *m) |
1533 | { | |
1534 | struct svc_i3c_master *master = to_svc_i3c_master(m); | |
1535 | int ret; | |
1536 | ||
1537 | ret = pm_runtime_resume_and_get(master->dev); | |
1538 | if (ret < 0) { | |
1539 | dev_err(master->dev, "<%s> Cannot get runtime PM.\n", __func__); | |
1540 | return ret; | |
1541 | } | |
1542 | ||
1543 | master->enabled_events |= SVC_I3C_EVENT_HOTJOIN; | |
1544 | ||
1545 | svc_i3c_master_enable_interrupts(master, SVC_I3C_MINT_SLVSTART); | |
1546 | ||
1547 | return 0; | |
1548 | } | |
1549 | ||
1550 | static int svc_i3c_master_disable_hotjoin(struct i3c_master_controller *m) | |
1551 | { | |
1552 | struct svc_i3c_master *master = to_svc_i3c_master(m); | |
1553 | ||
1554 | master->enabled_events &= ~SVC_I3C_EVENT_HOTJOIN; | |
1555 | ||
1556 | if (!master->enabled_events) | |
1557 | svc_i3c_master_disable_interrupts(master); | |
1558 | ||
1559 | pm_runtime_mark_last_busy(master->dev); | |
1560 | pm_runtime_put_autosuspend(master->dev); | |
1561 | ||
1562 | return 0; | |
1563 | } | |
1564 | ||
dd3c5284 MR |
1565 | static void svc_i3c_master_recycle_ibi_slot(struct i3c_dev_desc *dev, |
1566 | struct i3c_ibi_slot *slot) | |
1567 | { | |
1568 | struct svc_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev); | |
1569 | ||
1570 | i3c_generic_ibi_recycle_slot(data->ibi_pool, slot); | |
1571 | } | |
1572 | ||
1573 | static const struct i3c_master_controller_ops svc_i3c_master_ops = { | |
1574 | .bus_init = svc_i3c_master_bus_init, | |
1575 | .bus_cleanup = svc_i3c_master_bus_cleanup, | |
1576 | .attach_i3c_dev = svc_i3c_master_attach_i3c_dev, | |
1577 | .detach_i3c_dev = svc_i3c_master_detach_i3c_dev, | |
1578 | .reattach_i3c_dev = svc_i3c_master_reattach_i3c_dev, | |
1579 | .attach_i2c_dev = svc_i3c_master_attach_i2c_dev, | |
1580 | .detach_i2c_dev = svc_i3c_master_detach_i2c_dev, | |
1581 | .do_daa = svc_i3c_master_do_daa, | |
1582 | .supports_ccc_cmd = svc_i3c_master_supports_ccc_cmd, | |
1583 | .send_ccc_cmd = svc_i3c_master_send_ccc_cmd, | |
1584 | .priv_xfers = svc_i3c_master_priv_xfers, | |
1585 | .i2c_xfers = svc_i3c_master_i2c_xfers, | |
1586 | .request_ibi = svc_i3c_master_request_ibi, | |
1587 | .free_ibi = svc_i3c_master_free_ibi, | |
1588 | .recycle_ibi_slot = svc_i3c_master_recycle_ibi_slot, | |
1589 | .enable_ibi = svc_i3c_master_enable_ibi, | |
1590 | .disable_ibi = svc_i3c_master_disable_ibi, | |
05b26c31 FL |
1591 | .enable_hotjoin = svc_i3c_master_enable_hotjoin, |
1592 | .disable_hotjoin = svc_i3c_master_disable_hotjoin, | |
dd3c5284 MR |
1593 | }; |
1594 | ||
05be23ef CW |
1595 | static int svc_i3c_master_prepare_clks(struct svc_i3c_master *master) |
1596 | { | |
1597 | int ret = 0; | |
1598 | ||
1599 | ret = clk_prepare_enable(master->pclk); | |
1600 | if (ret) | |
1601 | return ret; | |
1602 | ||
1603 | ret = clk_prepare_enable(master->fclk); | |
1604 | if (ret) { | |
1605 | clk_disable_unprepare(master->pclk); | |
1606 | return ret; | |
1607 | } | |
1608 | ||
1609 | ret = clk_prepare_enable(master->sclk); | |
1610 | if (ret) { | |
1611 | clk_disable_unprepare(master->pclk); | |
1612 | clk_disable_unprepare(master->fclk); | |
1613 | return ret; | |
1614 | } | |
1615 | ||
1616 | return 0; | |
1617 | } | |
1618 | ||
1619 | static void svc_i3c_master_unprepare_clks(struct svc_i3c_master *master) | |
1620 | { | |
1621 | clk_disable_unprepare(master->pclk); | |
1622 | clk_disable_unprepare(master->fclk); | |
1623 | clk_disable_unprepare(master->sclk); | |
1624 | } | |
1625 | ||
dd3c5284 MR |
1626 | static int svc_i3c_master_probe(struct platform_device *pdev) |
1627 | { | |
1628 | struct device *dev = &pdev->dev; | |
1629 | struct svc_i3c_master *master; | |
1630 | int ret; | |
1631 | ||
1632 | master = devm_kzalloc(dev, sizeof(*master), GFP_KERNEL); | |
1633 | if (!master) | |
1634 | return -ENOMEM; | |
1635 | ||
1636 | master->regs = devm_platform_ioremap_resource(pdev, 0); | |
1637 | if (IS_ERR(master->regs)) | |
1638 | return PTR_ERR(master->regs); | |
1639 | ||
1640 | master->pclk = devm_clk_get(dev, "pclk"); | |
1641 | if (IS_ERR(master->pclk)) | |
1642 | return PTR_ERR(master->pclk); | |
1643 | ||
1644 | master->fclk = devm_clk_get(dev, "fast_clk"); | |
1645 | if (IS_ERR(master->fclk)) | |
1646 | return PTR_ERR(master->fclk); | |
1647 | ||
1648 | master->sclk = devm_clk_get(dev, "slow_clk"); | |
1649 | if (IS_ERR(master->sclk)) | |
1650 | return PTR_ERR(master->sclk); | |
1651 | ||
1652 | master->irq = platform_get_irq(pdev, 0); | |
30009863 RJ |
1653 | if (master->irq < 0) |
1654 | return master->irq; | |
dd3c5284 MR |
1655 | |
1656 | master->dev = dev; | |
1657 | ||
05be23ef | 1658 | ret = svc_i3c_master_prepare_clks(master); |
dd3c5284 MR |
1659 | if (ret) |
1660 | return ret; | |
1661 | ||
dd3c5284 MR |
1662 | INIT_WORK(&master->hj_work, svc_i3c_master_hj_work); |
1663 | INIT_WORK(&master->ibi_work, svc_i3c_master_ibi_work); | |
6bf3fc26 FL |
1664 | mutex_init(&master->lock); |
1665 | ||
dd3c5284 MR |
1666 | ret = devm_request_irq(dev, master->irq, svc_i3c_master_irq_handler, |
1667 | IRQF_NO_SUSPEND, "svc-i3c-irq", master); | |
1668 | if (ret) | |
05be23ef | 1669 | goto err_disable_clks; |
dd3c5284 MR |
1670 | |
1671 | master->free_slots = GENMASK(SVC_I3C_MAX_DEVS - 1, 0); | |
1672 | ||
1673 | spin_lock_init(&master->xferqueue.lock); | |
1674 | INIT_LIST_HEAD(&master->xferqueue.list); | |
1675 | ||
1676 | spin_lock_init(&master->ibi.lock); | |
1677 | master->ibi.num_slots = SVC_I3C_MAX_DEVS; | |
1678 | master->ibi.slots = devm_kcalloc(&pdev->dev, master->ibi.num_slots, | |
1679 | sizeof(*master->ibi.slots), | |
1680 | GFP_KERNEL); | |
1681 | if (!master->ibi.slots) { | |
1682 | ret = -ENOMEM; | |
05be23ef | 1683 | goto err_disable_clks; |
dd3c5284 MR |
1684 | } |
1685 | ||
1686 | platform_set_drvdata(pdev, master); | |
1687 | ||
05be23ef CW |
1688 | pm_runtime_set_autosuspend_delay(&pdev->dev, SVC_I3C_PM_TIMEOUT_MS); |
1689 | pm_runtime_use_autosuspend(&pdev->dev); | |
1690 | pm_runtime_get_noresume(&pdev->dev); | |
1691 | pm_runtime_set_active(&pdev->dev); | |
1692 | pm_runtime_enable(&pdev->dev); | |
1693 | ||
57d8d3fc CW |
1694 | svc_i3c_master_reset(master); |
1695 | ||
dd3c5284 MR |
1696 | /* Register the master */ |
1697 | ret = i3c_master_register(&master->base, &pdev->dev, | |
1698 | &svc_i3c_master_ops, false); | |
1699 | if (ret) | |
05be23ef CW |
1700 | goto rpm_disable; |
1701 | ||
1702 | pm_runtime_mark_last_busy(&pdev->dev); | |
1703 | pm_runtime_put_autosuspend(&pdev->dev); | |
dd3c5284 MR |
1704 | |
1705 | return 0; | |
1706 | ||
05be23ef CW |
1707 | rpm_disable: |
1708 | pm_runtime_dont_use_autosuspend(&pdev->dev); | |
1709 | pm_runtime_put_noidle(&pdev->dev); | |
1710 | pm_runtime_set_suspended(&pdev->dev); | |
1711 | pm_runtime_disable(&pdev->dev); | |
dd3c5284 | 1712 | |
05be23ef CW |
1713 | err_disable_clks: |
1714 | svc_i3c_master_unprepare_clks(master); | |
dd3c5284 MR |
1715 | |
1716 | return ret; | |
1717 | } | |
1718 | ||
2810f1de | 1719 | static void svc_i3c_master_remove(struct platform_device *pdev) |
dd3c5284 MR |
1720 | { |
1721 | struct svc_i3c_master *master = platform_get_drvdata(pdev); | |
dd3c5284 | 1722 | |
0f74f8b6 | 1723 | i3c_master_unregister(&master->base); |
dd3c5284 | 1724 | |
05be23ef CW |
1725 | pm_runtime_dont_use_autosuspend(&pdev->dev); |
1726 | pm_runtime_disable(&pdev->dev); | |
dd3c5284 MR |
1727 | } |
1728 | ||
1c5ee2a7 CW |
1729 | static void svc_i3c_save_regs(struct svc_i3c_master *master) |
1730 | { | |
1731 | master->saved_regs.mconfig = readl(master->regs + SVC_I3C_MCONFIG); | |
1732 | master->saved_regs.mdynaddr = readl(master->regs + SVC_I3C_MDYNADDR); | |
1733 | } | |
1734 | ||
1735 | static void svc_i3c_restore_regs(struct svc_i3c_master *master) | |
1736 | { | |
1737 | if (readl(master->regs + SVC_I3C_MDYNADDR) != | |
1738 | master->saved_regs.mdynaddr) { | |
1739 | writel(master->saved_regs.mconfig, | |
1740 | master->regs + SVC_I3C_MCONFIG); | |
1741 | writel(master->saved_regs.mdynaddr, | |
1742 | master->regs + SVC_I3C_MDYNADDR); | |
1743 | } | |
1744 | } | |
1745 | ||
05be23ef CW |
1746 | static int __maybe_unused svc_i3c_runtime_suspend(struct device *dev) |
1747 | { | |
1748 | struct svc_i3c_master *master = dev_get_drvdata(dev); | |
1749 | ||
1c5ee2a7 | 1750 | svc_i3c_save_regs(master); |
05be23ef CW |
1751 | svc_i3c_master_unprepare_clks(master); |
1752 | pinctrl_pm_select_sleep_state(dev); | |
1753 | ||
1754 | return 0; | |
1755 | } | |
1756 | ||
1757 | static int __maybe_unused svc_i3c_runtime_resume(struct device *dev) | |
1758 | { | |
1759 | struct svc_i3c_master *master = dev_get_drvdata(dev); | |
05be23ef CW |
1760 | |
1761 | pinctrl_pm_select_default_state(dev); | |
1762 | svc_i3c_master_prepare_clks(master); | |
1763 | ||
1c5ee2a7 CW |
1764 | svc_i3c_restore_regs(master); |
1765 | ||
227fab1e | 1766 | return 0; |
05be23ef CW |
1767 | } |
1768 | ||
1769 | static const struct dev_pm_ops svc_i3c_pm_ops = { | |
1770 | SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, | |
1771 | pm_runtime_force_resume) | |
1772 | SET_RUNTIME_PM_OPS(svc_i3c_runtime_suspend, | |
1773 | svc_i3c_runtime_resume, NULL) | |
1774 | }; | |
1775 | ||
dd3c5284 | 1776 | static const struct of_device_id svc_i3c_master_of_match_tbl[] = { |
8911eae9 | 1777 | { .compatible = "silvaco,i3c-master-v1"}, |
dd3c5284 MR |
1778 | { /* sentinel */ }, |
1779 | }; | |
c5d4587b | 1780 | MODULE_DEVICE_TABLE(of, svc_i3c_master_of_match_tbl); |
dd3c5284 MR |
1781 | |
1782 | static struct platform_driver svc_i3c_master = { | |
1783 | .probe = svc_i3c_master_probe, | |
2810f1de | 1784 | .remove_new = svc_i3c_master_remove, |
dd3c5284 MR |
1785 | .driver = { |
1786 | .name = "silvaco-i3c-master", | |
1787 | .of_match_table = svc_i3c_master_of_match_tbl, | |
05be23ef | 1788 | .pm = &svc_i3c_pm_ops, |
dd3c5284 MR |
1789 | }, |
1790 | }; | |
1791 | module_platform_driver(svc_i3c_master); | |
1792 | ||
1793 | MODULE_AUTHOR("Conor Culhane <conor.culhane@silvaco.com>"); | |
1794 | MODULE_AUTHOR("Miquel Raynal <miquel.raynal@bootlin.com>"); | |
1795 | MODULE_DESCRIPTION("Silvaco dual-role I3C master driver"); | |
1796 | MODULE_LICENSE("GPL v2"); |