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1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | // Copyright (C) 2017 Broadcom | |
bf7e1899 AP |
3 | |
4 | /* | |
5 | * Broadcom FlexRM Mailbox Driver | |
dbc049ee AP |
6 | * |
7 | * Each Broadcom FlexSparx4 offload engine is implemented as an | |
8 | * extension to Broadcom FlexRM ring manager. The FlexRM ring | |
9 | * manager provides a set of rings which can be used to submit | |
10 | * work to a FlexSparx4 offload engine. | |
11 | * | |
12 | * This driver creates a mailbox controller using a set of FlexRM | |
13 | * rings where each mailbox channel represents a separate FlexRM ring. | |
14 | */ | |
15 | ||
16 | #include <asm/barrier.h> | |
17 | #include <asm/byteorder.h> | |
acf7e50a | 18 | #include <linux/atomic.h> |
1f7466c6 | 19 | #include <linux/bitmap.h> |
acf7e50a | 20 | #include <linux/debugfs.h> |
dbc049ee AP |
21 | #include <linux/delay.h> |
22 | #include <linux/device.h> | |
23 | #include <linux/dma-mapping.h> | |
24 | #include <linux/dmapool.h> | |
25 | #include <linux/err.h> | |
dbc049ee AP |
26 | #include <linux/interrupt.h> |
27 | #include <linux/kernel.h> | |
28 | #include <linux/mailbox_controller.h> | |
29 | #include <linux/mailbox_client.h> | |
30 | #include <linux/mailbox/brcm-message.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/msi.h> | |
33 | #include <linux/of_address.h> | |
34 | #include <linux/of_irq.h> | |
35 | #include <linux/platform_device.h> | |
36 | #include <linux/spinlock.h> | |
37 | ||
38 | /* ====== FlexRM register defines ===== */ | |
39 | ||
40 | /* FlexRM configuration */ | |
41 | #define RING_REGS_SIZE 0x10000 | |
42 | #define RING_DESC_SIZE 8 | |
43 | #define RING_DESC_INDEX(offset) \ | |
44 | ((offset) / RING_DESC_SIZE) | |
45 | #define RING_DESC_OFFSET(index) \ | |
46 | ((index) * RING_DESC_SIZE) | |
47 | #define RING_MAX_REQ_COUNT 1024 | |
48 | #define RING_BD_ALIGN_ORDER 12 | |
49 | #define RING_BD_ALIGN_CHECK(addr) \ | |
50 | (!((addr) & ((0x1 << RING_BD_ALIGN_ORDER) - 1))) | |
51 | #define RING_BD_TOGGLE_INVALID(offset) \ | |
52 | (((offset) >> RING_BD_ALIGN_ORDER) & 0x1) | |
53 | #define RING_BD_TOGGLE_VALID(offset) \ | |
54 | (!RING_BD_TOGGLE_INVALID(offset)) | |
55 | #define RING_BD_DESC_PER_REQ 32 | |
56 | #define RING_BD_DESC_COUNT \ | |
57 | (RING_MAX_REQ_COUNT * RING_BD_DESC_PER_REQ) | |
58 | #define RING_BD_SIZE \ | |
59 | (RING_BD_DESC_COUNT * RING_DESC_SIZE) | |
60 | #define RING_CMPL_ALIGN_ORDER 13 | |
61 | #define RING_CMPL_DESC_COUNT RING_MAX_REQ_COUNT | |
62 | #define RING_CMPL_SIZE \ | |
63 | (RING_CMPL_DESC_COUNT * RING_DESC_SIZE) | |
64 | #define RING_VER_MAGIC 0x76303031 | |
65 | ||
66 | /* Per-Ring register offsets */ | |
67 | #define RING_VER 0x000 | |
68 | #define RING_BD_START_ADDR 0x004 | |
69 | #define RING_BD_READ_PTR 0x008 | |
70 | #define RING_BD_WRITE_PTR 0x00c | |
71 | #define RING_BD_READ_PTR_DDR_LS 0x010 | |
72 | #define RING_BD_READ_PTR_DDR_MS 0x014 | |
73 | #define RING_CMPL_START_ADDR 0x018 | |
74 | #define RING_CMPL_WRITE_PTR 0x01c | |
75 | #define RING_NUM_REQ_RECV_LS 0x020 | |
76 | #define RING_NUM_REQ_RECV_MS 0x024 | |
77 | #define RING_NUM_REQ_TRANS_LS 0x028 | |
78 | #define RING_NUM_REQ_TRANS_MS 0x02c | |
79 | #define RING_NUM_REQ_OUTSTAND 0x030 | |
80 | #define RING_CONTROL 0x034 | |
81 | #define RING_FLUSH_DONE 0x038 | |
82 | #define RING_MSI_ADDR_LS 0x03c | |
83 | #define RING_MSI_ADDR_MS 0x040 | |
84 | #define RING_MSI_CONTROL 0x048 | |
85 | #define RING_BD_READ_PTR_DDR_CONTROL 0x04c | |
86 | #define RING_MSI_DATA_VALUE 0x064 | |
87 | ||
88 | /* Register RING_BD_START_ADDR fields */ | |
89 | #define BD_LAST_UPDATE_HW_SHIFT 28 | |
90 | #define BD_LAST_UPDATE_HW_MASK 0x1 | |
91 | #define BD_START_ADDR_VALUE(pa) \ | |
92 | ((u32)((((dma_addr_t)(pa)) >> RING_BD_ALIGN_ORDER) & 0x0fffffff)) | |
93 | #define BD_START_ADDR_DECODE(val) \ | |
94 | ((dma_addr_t)((val) & 0x0fffffff) << RING_BD_ALIGN_ORDER) | |
95 | ||
96 | /* Register RING_CMPL_START_ADDR fields */ | |
97 | #define CMPL_START_ADDR_VALUE(pa) \ | |
6d2061b9 | 98 | ((u32)((((u64)(pa)) >> RING_CMPL_ALIGN_ORDER) & 0x07ffffff)) |
dbc049ee AP |
99 | |
100 | /* Register RING_CONTROL fields */ | |
101 | #define CONTROL_MASK_DISABLE_CONTROL 12 | |
102 | #define CONTROL_FLUSH_SHIFT 5 | |
103 | #define CONTROL_ACTIVE_SHIFT 4 | |
104 | #define CONTROL_RATE_ADAPT_MASK 0xf | |
105 | #define CONTROL_RATE_DYNAMIC 0x0 | |
106 | #define CONTROL_RATE_FAST 0x8 | |
107 | #define CONTROL_RATE_MEDIUM 0x9 | |
108 | #define CONTROL_RATE_SLOW 0xa | |
109 | #define CONTROL_RATE_IDLE 0xb | |
110 | ||
111 | /* Register RING_FLUSH_DONE fields */ | |
112 | #define FLUSH_DONE_MASK 0x1 | |
113 | ||
114 | /* Register RING_MSI_CONTROL fields */ | |
115 | #define MSI_TIMER_VAL_SHIFT 16 | |
116 | #define MSI_TIMER_VAL_MASK 0xffff | |
117 | #define MSI_ENABLE_SHIFT 15 | |
118 | #define MSI_ENABLE_MASK 0x1 | |
119 | #define MSI_COUNT_SHIFT 0 | |
120 | #define MSI_COUNT_MASK 0x3ff | |
121 | ||
122 | /* Register RING_BD_READ_PTR_DDR_CONTROL fields */ | |
123 | #define BD_READ_PTR_DDR_TIMER_VAL_SHIFT 16 | |
124 | #define BD_READ_PTR_DDR_TIMER_VAL_MASK 0xffff | |
125 | #define BD_READ_PTR_DDR_ENABLE_SHIFT 15 | |
126 | #define BD_READ_PTR_DDR_ENABLE_MASK 0x1 | |
127 | ||
128 | /* ====== FlexRM ring descriptor defines ===== */ | |
129 | ||
130 | /* Completion descriptor format */ | |
131 | #define CMPL_OPAQUE_SHIFT 0 | |
132 | #define CMPL_OPAQUE_MASK 0xffff | |
133 | #define CMPL_ENGINE_STATUS_SHIFT 16 | |
134 | #define CMPL_ENGINE_STATUS_MASK 0xffff | |
135 | #define CMPL_DME_STATUS_SHIFT 32 | |
136 | #define CMPL_DME_STATUS_MASK 0xffff | |
137 | #define CMPL_RM_STATUS_SHIFT 48 | |
138 | #define CMPL_RM_STATUS_MASK 0xffff | |
139 | ||
140 | /* Completion DME status code */ | |
141 | #define DME_STATUS_MEM_COR_ERR BIT(0) | |
142 | #define DME_STATUS_MEM_UCOR_ERR BIT(1) | |
143 | #define DME_STATUS_FIFO_UNDERFLOW BIT(2) | |
144 | #define DME_STATUS_FIFO_OVERFLOW BIT(3) | |
145 | #define DME_STATUS_RRESP_ERR BIT(4) | |
146 | #define DME_STATUS_BRESP_ERR BIT(5) | |
147 | #define DME_STATUS_ERROR_MASK (DME_STATUS_MEM_COR_ERR | \ | |
148 | DME_STATUS_MEM_UCOR_ERR | \ | |
149 | DME_STATUS_FIFO_UNDERFLOW | \ | |
150 | DME_STATUS_FIFO_OVERFLOW | \ | |
151 | DME_STATUS_RRESP_ERR | \ | |
152 | DME_STATUS_BRESP_ERR) | |
153 | ||
154 | /* Completion RM status code */ | |
155 | #define RM_STATUS_CODE_SHIFT 0 | |
156 | #define RM_STATUS_CODE_MASK 0x3ff | |
157 | #define RM_STATUS_CODE_GOOD 0x0 | |
158 | #define RM_STATUS_CODE_AE_TIMEOUT 0x3ff | |
159 | ||
160 | /* General descriptor format */ | |
161 | #define DESC_TYPE_SHIFT 60 | |
162 | #define DESC_TYPE_MASK 0xf | |
163 | #define DESC_PAYLOAD_SHIFT 0 | |
164 | #define DESC_PAYLOAD_MASK 0x0fffffffffffffff | |
165 | ||
166 | /* Null descriptor format */ | |
167 | #define NULL_TYPE 0 | |
168 | #define NULL_TOGGLE_SHIFT 58 | |
169 | #define NULL_TOGGLE_MASK 0x1 | |
170 | ||
171 | /* Header descriptor format */ | |
172 | #define HEADER_TYPE 1 | |
173 | #define HEADER_TOGGLE_SHIFT 58 | |
174 | #define HEADER_TOGGLE_MASK 0x1 | |
175 | #define HEADER_ENDPKT_SHIFT 57 | |
176 | #define HEADER_ENDPKT_MASK 0x1 | |
177 | #define HEADER_STARTPKT_SHIFT 56 | |
178 | #define HEADER_STARTPKT_MASK 0x1 | |
179 | #define HEADER_BDCOUNT_SHIFT 36 | |
180 | #define HEADER_BDCOUNT_MASK 0x1f | |
181 | #define HEADER_BDCOUNT_MAX HEADER_BDCOUNT_MASK | |
182 | #define HEADER_FLAGS_SHIFT 16 | |
183 | #define HEADER_FLAGS_MASK 0xffff | |
184 | #define HEADER_OPAQUE_SHIFT 0 | |
185 | #define HEADER_OPAQUE_MASK 0xffff | |
186 | ||
187 | /* Source (SRC) descriptor format */ | |
188 | #define SRC_TYPE 2 | |
189 | #define SRC_LENGTH_SHIFT 44 | |
190 | #define SRC_LENGTH_MASK 0xffff | |
191 | #define SRC_ADDR_SHIFT 0 | |
192 | #define SRC_ADDR_MASK 0x00000fffffffffff | |
193 | ||
194 | /* Destination (DST) descriptor format */ | |
195 | #define DST_TYPE 3 | |
196 | #define DST_LENGTH_SHIFT 44 | |
197 | #define DST_LENGTH_MASK 0xffff | |
198 | #define DST_ADDR_SHIFT 0 | |
199 | #define DST_ADDR_MASK 0x00000fffffffffff | |
200 | ||
201 | /* Immediate (IMM) descriptor format */ | |
202 | #define IMM_TYPE 4 | |
203 | #define IMM_DATA_SHIFT 0 | |
204 | #define IMM_DATA_MASK 0x0fffffffffffffff | |
205 | ||
206 | /* Next pointer (NPTR) descriptor format */ | |
207 | #define NPTR_TYPE 5 | |
208 | #define NPTR_TOGGLE_SHIFT 58 | |
209 | #define NPTR_TOGGLE_MASK 0x1 | |
210 | #define NPTR_ADDR_SHIFT 0 | |
211 | #define NPTR_ADDR_MASK 0x00000fffffffffff | |
212 | ||
213 | /* Mega source (MSRC) descriptor format */ | |
214 | #define MSRC_TYPE 6 | |
215 | #define MSRC_LENGTH_SHIFT 44 | |
216 | #define MSRC_LENGTH_MASK 0xffff | |
217 | #define MSRC_ADDR_SHIFT 0 | |
218 | #define MSRC_ADDR_MASK 0x00000fffffffffff | |
219 | ||
220 | /* Mega destination (MDST) descriptor format */ | |
221 | #define MDST_TYPE 7 | |
222 | #define MDST_LENGTH_SHIFT 44 | |
223 | #define MDST_LENGTH_MASK 0xffff | |
224 | #define MDST_ADDR_SHIFT 0 | |
225 | #define MDST_ADDR_MASK 0x00000fffffffffff | |
226 | ||
227 | /* Source with tlast (SRCT) descriptor format */ | |
228 | #define SRCT_TYPE 8 | |
229 | #define SRCT_LENGTH_SHIFT 44 | |
230 | #define SRCT_LENGTH_MASK 0xffff | |
231 | #define SRCT_ADDR_SHIFT 0 | |
232 | #define SRCT_ADDR_MASK 0x00000fffffffffff | |
233 | ||
234 | /* Destination with tlast (DSTT) descriptor format */ | |
235 | #define DSTT_TYPE 9 | |
236 | #define DSTT_LENGTH_SHIFT 44 | |
237 | #define DSTT_LENGTH_MASK 0xffff | |
238 | #define DSTT_ADDR_SHIFT 0 | |
239 | #define DSTT_ADDR_MASK 0x00000fffffffffff | |
240 | ||
241 | /* Immediate with tlast (IMMT) descriptor format */ | |
242 | #define IMMT_TYPE 10 | |
243 | #define IMMT_DATA_SHIFT 0 | |
244 | #define IMMT_DATA_MASK 0x0fffffffffffffff | |
245 | ||
246 | /* Descriptor helper macros */ | |
247 | #define DESC_DEC(_d, _s, _m) (((_d) >> (_s)) & (_m)) | |
248 | #define DESC_ENC(_d, _v, _s, _m) \ | |
249 | do { \ | |
250 | (_d) &= ~((u64)(_m) << (_s)); \ | |
251 | (_d) |= (((u64)(_v) & (_m)) << (_s)); \ | |
252 | } while (0) | |
253 | ||
254 | /* ====== FlexRM data structures ===== */ | |
255 | ||
256 | struct flexrm_ring { | |
257 | /* Unprotected members */ | |
258 | int num; | |
259 | struct flexrm_mbox *mbox; | |
260 | void __iomem *regs; | |
261 | bool irq_requested; | |
262 | unsigned int irq; | |
6ac17fe8 | 263 | cpumask_t irq_aff_hint; |
dbc049ee AP |
264 | unsigned int msi_timer_val; |
265 | unsigned int msi_count_threshold; | |
dbc049ee AP |
266 | struct brcm_message *requests[RING_MAX_REQ_COUNT]; |
267 | void *bd_base; | |
268 | dma_addr_t bd_dma_base; | |
269 | u32 bd_write_offset; | |
270 | void *cmpl_base; | |
271 | dma_addr_t cmpl_dma_base; | |
acf7e50a AP |
272 | /* Atomic stats */ |
273 | atomic_t msg_send_count; | |
274 | atomic_t msg_cmpl_count; | |
dbc049ee AP |
275 | /* Protected members */ |
276 | spinlock_t lock; | |
1f7466c6 | 277 | DECLARE_BITMAP(requests_bmap, RING_MAX_REQ_COUNT); |
dbc049ee AP |
278 | u32 cmpl_read_offset; |
279 | }; | |
280 | ||
281 | struct flexrm_mbox { | |
282 | struct device *dev; | |
283 | void __iomem *regs; | |
284 | u32 num_rings; | |
285 | struct flexrm_ring *rings; | |
286 | struct dma_pool *bd_pool; | |
287 | struct dma_pool *cmpl_pool; | |
acf7e50a | 288 | struct dentry *root; |
dbc049ee AP |
289 | struct mbox_controller controller; |
290 | }; | |
291 | ||
292 | /* ====== FlexRM ring descriptor helper routines ===== */ | |
293 | ||
294 | static u64 flexrm_read_desc(void *desc_ptr) | |
295 | { | |
296 | return le64_to_cpu(*((u64 *)desc_ptr)); | |
297 | } | |
298 | ||
299 | static void flexrm_write_desc(void *desc_ptr, u64 desc) | |
300 | { | |
301 | *((u64 *)desc_ptr) = cpu_to_le64(desc); | |
302 | } | |
303 | ||
304 | static u32 flexrm_cmpl_desc_to_reqid(u64 cmpl_desc) | |
305 | { | |
306 | return (u32)(cmpl_desc & CMPL_OPAQUE_MASK); | |
307 | } | |
308 | ||
309 | static int flexrm_cmpl_desc_to_error(u64 cmpl_desc) | |
310 | { | |
311 | u32 status; | |
312 | ||
313 | status = DESC_DEC(cmpl_desc, CMPL_DME_STATUS_SHIFT, | |
314 | CMPL_DME_STATUS_MASK); | |
315 | if (status & DME_STATUS_ERROR_MASK) | |
316 | return -EIO; | |
317 | ||
318 | status = DESC_DEC(cmpl_desc, CMPL_RM_STATUS_SHIFT, | |
319 | CMPL_RM_STATUS_MASK); | |
320 | status &= RM_STATUS_CODE_MASK; | |
321 | if (status == RM_STATUS_CODE_AE_TIMEOUT) | |
322 | return -ETIMEDOUT; | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
327 | static bool flexrm_is_next_table_desc(void *desc_ptr) | |
328 | { | |
329 | u64 desc = flexrm_read_desc(desc_ptr); | |
330 | u32 type = DESC_DEC(desc, DESC_TYPE_SHIFT, DESC_TYPE_MASK); | |
331 | ||
332 | return (type == NPTR_TYPE) ? true : false; | |
333 | } | |
334 | ||
335 | static u64 flexrm_next_table_desc(u32 toggle, dma_addr_t next_addr) | |
336 | { | |
337 | u64 desc = 0; | |
338 | ||
339 | DESC_ENC(desc, NPTR_TYPE, DESC_TYPE_SHIFT, DESC_TYPE_MASK); | |
340 | DESC_ENC(desc, toggle, NPTR_TOGGLE_SHIFT, NPTR_TOGGLE_MASK); | |
341 | DESC_ENC(desc, next_addr, NPTR_ADDR_SHIFT, NPTR_ADDR_MASK); | |
342 | ||
343 | return desc; | |
344 | } | |
345 | ||
346 | static u64 flexrm_null_desc(u32 toggle) | |
347 | { | |
348 | u64 desc = 0; | |
349 | ||
350 | DESC_ENC(desc, NULL_TYPE, DESC_TYPE_SHIFT, DESC_TYPE_MASK); | |
351 | DESC_ENC(desc, toggle, NULL_TOGGLE_SHIFT, NULL_TOGGLE_MASK); | |
352 | ||
353 | return desc; | |
354 | } | |
355 | ||
356 | static u32 flexrm_estimate_header_desc_count(u32 nhcnt) | |
357 | { | |
358 | u32 hcnt = nhcnt / HEADER_BDCOUNT_MAX; | |
359 | ||
360 | if (!(nhcnt % HEADER_BDCOUNT_MAX)) | |
361 | hcnt += 1; | |
362 | ||
363 | return hcnt; | |
364 | } | |
365 | ||
462f668e | 366 | static void flexrm_flip_header_toggle(void *desc_ptr) |
dbc049ee AP |
367 | { |
368 | u64 desc = flexrm_read_desc(desc_ptr); | |
369 | ||
370 | if (desc & ((u64)0x1 << HEADER_TOGGLE_SHIFT)) | |
371 | desc &= ~((u64)0x1 << HEADER_TOGGLE_SHIFT); | |
372 | else | |
373 | desc |= ((u64)0x1 << HEADER_TOGGLE_SHIFT); | |
374 | ||
375 | flexrm_write_desc(desc_ptr, desc); | |
376 | } | |
377 | ||
378 | static u64 flexrm_header_desc(u32 toggle, u32 startpkt, u32 endpkt, | |
379 | u32 bdcount, u32 flags, u32 opaque) | |
380 | { | |
381 | u64 desc = 0; | |
382 | ||
383 | DESC_ENC(desc, HEADER_TYPE, DESC_TYPE_SHIFT, DESC_TYPE_MASK); | |
384 | DESC_ENC(desc, toggle, HEADER_TOGGLE_SHIFT, HEADER_TOGGLE_MASK); | |
385 | DESC_ENC(desc, startpkt, HEADER_STARTPKT_SHIFT, HEADER_STARTPKT_MASK); | |
386 | DESC_ENC(desc, endpkt, HEADER_ENDPKT_SHIFT, HEADER_ENDPKT_MASK); | |
387 | DESC_ENC(desc, bdcount, HEADER_BDCOUNT_SHIFT, HEADER_BDCOUNT_MASK); | |
388 | DESC_ENC(desc, flags, HEADER_FLAGS_SHIFT, HEADER_FLAGS_MASK); | |
389 | DESC_ENC(desc, opaque, HEADER_OPAQUE_SHIFT, HEADER_OPAQUE_MASK); | |
390 | ||
391 | return desc; | |
392 | } | |
393 | ||
394 | static void flexrm_enqueue_desc(u32 nhpos, u32 nhcnt, u32 reqid, | |
395 | u64 desc, void **desc_ptr, u32 *toggle, | |
396 | void *start_desc, void *end_desc) | |
397 | { | |
398 | u64 d; | |
399 | u32 nhavail, _toggle, _startpkt, _endpkt, _bdcount; | |
400 | ||
401 | /* Sanity check */ | |
402 | if (nhcnt <= nhpos) | |
403 | return; | |
404 | ||
405 | /* | |
406 | * Each request or packet start with a HEADER descriptor followed | |
407 | * by one or more non-HEADER descriptors (SRC, SRCT, MSRC, DST, | |
408 | * DSTT, MDST, IMM, and IMMT). The number of non-HEADER descriptors | |
409 | * following a HEADER descriptor is represented by BDCOUNT field | |
410 | * of HEADER descriptor. The max value of BDCOUNT field is 31 which | |
411 | * means we can only have 31 non-HEADER descriptors following one | |
412 | * HEADER descriptor. | |
413 | * | |
414 | * In general use, number of non-HEADER descriptors can easily go | |
415 | * beyond 31. To tackle this situation, we have packet (or request) | |
9d2e8b93 | 416 | * extension bits (STARTPKT and ENDPKT) in the HEADER descriptor. |
dbc049ee AP |
417 | * |
418 | * To use packet extension, the first HEADER descriptor of request | |
419 | * (or packet) will have STARTPKT=1 and ENDPKT=0. The intermediate | |
420 | * HEADER descriptors will have STARTPKT=0 and ENDPKT=0. The last | |
421 | * HEADER descriptor will have STARTPKT=0 and ENDPKT=1. Also, the | |
422 | * TOGGLE bit of the first HEADER will be set to invalid state to | |
423 | * ensure that FlexRM does not start fetching descriptors till all | |
424 | * descriptors are enqueued. The user of this function will flip | |
425 | * the TOGGLE bit of first HEADER after all descriptors are | |
426 | * enqueued. | |
427 | */ | |
428 | ||
429 | if ((nhpos % HEADER_BDCOUNT_MAX == 0) && (nhcnt - nhpos)) { | |
430 | /* Prepare the header descriptor */ | |
431 | nhavail = (nhcnt - nhpos); | |
432 | _toggle = (nhpos == 0) ? !(*toggle) : (*toggle); | |
433 | _startpkt = (nhpos == 0) ? 0x1 : 0x0; | |
434 | _endpkt = (nhavail <= HEADER_BDCOUNT_MAX) ? 0x1 : 0x0; | |
435 | _bdcount = (nhavail <= HEADER_BDCOUNT_MAX) ? | |
436 | nhavail : HEADER_BDCOUNT_MAX; | |
437 | if (nhavail <= HEADER_BDCOUNT_MAX) | |
438 | _bdcount = nhavail; | |
439 | else | |
440 | _bdcount = HEADER_BDCOUNT_MAX; | |
441 | d = flexrm_header_desc(_toggle, _startpkt, _endpkt, | |
442 | _bdcount, 0x0, reqid); | |
443 | ||
444 | /* Write header descriptor */ | |
445 | flexrm_write_desc(*desc_ptr, d); | |
446 | ||
447 | /* Point to next descriptor */ | |
448 | *desc_ptr += sizeof(desc); | |
449 | if (*desc_ptr == end_desc) | |
450 | *desc_ptr = start_desc; | |
451 | ||
452 | /* Skip next pointer descriptors */ | |
453 | while (flexrm_is_next_table_desc(*desc_ptr)) { | |
454 | *toggle = (*toggle) ? 0 : 1; | |
455 | *desc_ptr += sizeof(desc); | |
456 | if (*desc_ptr == end_desc) | |
457 | *desc_ptr = start_desc; | |
458 | } | |
459 | } | |
460 | ||
461 | /* Write desired descriptor */ | |
462 | flexrm_write_desc(*desc_ptr, desc); | |
463 | ||
464 | /* Point to next descriptor */ | |
465 | *desc_ptr += sizeof(desc); | |
466 | if (*desc_ptr == end_desc) | |
467 | *desc_ptr = start_desc; | |
468 | ||
469 | /* Skip next pointer descriptors */ | |
470 | while (flexrm_is_next_table_desc(*desc_ptr)) { | |
471 | *toggle = (*toggle) ? 0 : 1; | |
472 | *desc_ptr += sizeof(desc); | |
473 | if (*desc_ptr == end_desc) | |
474 | *desc_ptr = start_desc; | |
475 | } | |
476 | } | |
477 | ||
478 | static u64 flexrm_src_desc(dma_addr_t addr, unsigned int length) | |
479 | { | |
480 | u64 desc = 0; | |
481 | ||
482 | DESC_ENC(desc, SRC_TYPE, DESC_TYPE_SHIFT, DESC_TYPE_MASK); | |
483 | DESC_ENC(desc, length, SRC_LENGTH_SHIFT, SRC_LENGTH_MASK); | |
484 | DESC_ENC(desc, addr, SRC_ADDR_SHIFT, SRC_ADDR_MASK); | |
485 | ||
486 | return desc; | |
487 | } | |
488 | ||
489 | static u64 flexrm_msrc_desc(dma_addr_t addr, unsigned int length_div_16) | |
490 | { | |
491 | u64 desc = 0; | |
492 | ||
493 | DESC_ENC(desc, MSRC_TYPE, DESC_TYPE_SHIFT, DESC_TYPE_MASK); | |
494 | DESC_ENC(desc, length_div_16, MSRC_LENGTH_SHIFT, MSRC_LENGTH_MASK); | |
495 | DESC_ENC(desc, addr, MSRC_ADDR_SHIFT, MSRC_ADDR_MASK); | |
496 | ||
497 | return desc; | |
498 | } | |
499 | ||
500 | static u64 flexrm_dst_desc(dma_addr_t addr, unsigned int length) | |
501 | { | |
502 | u64 desc = 0; | |
503 | ||
504 | DESC_ENC(desc, DST_TYPE, DESC_TYPE_SHIFT, DESC_TYPE_MASK); | |
505 | DESC_ENC(desc, length, DST_LENGTH_SHIFT, DST_LENGTH_MASK); | |
506 | DESC_ENC(desc, addr, DST_ADDR_SHIFT, DST_ADDR_MASK); | |
507 | ||
508 | return desc; | |
509 | } | |
510 | ||
511 | static u64 flexrm_mdst_desc(dma_addr_t addr, unsigned int length_div_16) | |
512 | { | |
513 | u64 desc = 0; | |
514 | ||
515 | DESC_ENC(desc, MDST_TYPE, DESC_TYPE_SHIFT, DESC_TYPE_MASK); | |
516 | DESC_ENC(desc, length_div_16, MDST_LENGTH_SHIFT, MDST_LENGTH_MASK); | |
517 | DESC_ENC(desc, addr, MDST_ADDR_SHIFT, MDST_ADDR_MASK); | |
518 | ||
519 | return desc; | |
520 | } | |
521 | ||
522 | static u64 flexrm_imm_desc(u64 data) | |
523 | { | |
524 | u64 desc = 0; | |
525 | ||
526 | DESC_ENC(desc, IMM_TYPE, DESC_TYPE_SHIFT, DESC_TYPE_MASK); | |
527 | DESC_ENC(desc, data, IMM_DATA_SHIFT, IMM_DATA_MASK); | |
528 | ||
529 | return desc; | |
530 | } | |
531 | ||
532 | static u64 flexrm_srct_desc(dma_addr_t addr, unsigned int length) | |
533 | { | |
534 | u64 desc = 0; | |
535 | ||
536 | DESC_ENC(desc, SRCT_TYPE, DESC_TYPE_SHIFT, DESC_TYPE_MASK); | |
537 | DESC_ENC(desc, length, SRCT_LENGTH_SHIFT, SRCT_LENGTH_MASK); | |
538 | DESC_ENC(desc, addr, SRCT_ADDR_SHIFT, SRCT_ADDR_MASK); | |
539 | ||
540 | return desc; | |
541 | } | |
542 | ||
543 | static u64 flexrm_dstt_desc(dma_addr_t addr, unsigned int length) | |
544 | { | |
545 | u64 desc = 0; | |
546 | ||
547 | DESC_ENC(desc, DSTT_TYPE, DESC_TYPE_SHIFT, DESC_TYPE_MASK); | |
548 | DESC_ENC(desc, length, DSTT_LENGTH_SHIFT, DSTT_LENGTH_MASK); | |
549 | DESC_ENC(desc, addr, DSTT_ADDR_SHIFT, DSTT_ADDR_MASK); | |
550 | ||
551 | return desc; | |
552 | } | |
553 | ||
554 | static u64 flexrm_immt_desc(u64 data) | |
555 | { | |
556 | u64 desc = 0; | |
557 | ||
558 | DESC_ENC(desc, IMMT_TYPE, DESC_TYPE_SHIFT, DESC_TYPE_MASK); | |
559 | DESC_ENC(desc, data, IMMT_DATA_SHIFT, IMMT_DATA_MASK); | |
560 | ||
561 | return desc; | |
562 | } | |
563 | ||
564 | static bool flexrm_spu_sanity_check(struct brcm_message *msg) | |
565 | { | |
566 | struct scatterlist *sg; | |
567 | ||
568 | if (!msg->spu.src || !msg->spu.dst) | |
569 | return false; | |
570 | for (sg = msg->spu.src; sg; sg = sg_next(sg)) { | |
571 | if (sg->length & 0xf) { | |
572 | if (sg->length > SRC_LENGTH_MASK) | |
573 | return false; | |
574 | } else { | |
575 | if (sg->length > (MSRC_LENGTH_MASK * 16)) | |
576 | return false; | |
577 | } | |
578 | } | |
579 | for (sg = msg->spu.dst; sg; sg = sg_next(sg)) { | |
580 | if (sg->length & 0xf) { | |
581 | if (sg->length > DST_LENGTH_MASK) | |
582 | return false; | |
583 | } else { | |
584 | if (sg->length > (MDST_LENGTH_MASK * 16)) | |
585 | return false; | |
586 | } | |
587 | } | |
588 | ||
589 | return true; | |
590 | } | |
591 | ||
592 | static u32 flexrm_spu_estimate_nonheader_desc_count(struct brcm_message *msg) | |
593 | { | |
594 | u32 cnt = 0; | |
595 | unsigned int dst_target = 0; | |
596 | struct scatterlist *src_sg = msg->spu.src, *dst_sg = msg->spu.dst; | |
597 | ||
598 | while (src_sg || dst_sg) { | |
599 | if (src_sg) { | |
600 | cnt++; | |
601 | dst_target = src_sg->length; | |
602 | src_sg = sg_next(src_sg); | |
603 | } else | |
604 | dst_target = UINT_MAX; | |
605 | ||
606 | while (dst_target && dst_sg) { | |
607 | cnt++; | |
608 | if (dst_sg->length < dst_target) | |
609 | dst_target -= dst_sg->length; | |
610 | else | |
611 | dst_target = 0; | |
612 | dst_sg = sg_next(dst_sg); | |
613 | } | |
614 | } | |
615 | ||
616 | return cnt; | |
617 | } | |
618 | ||
619 | static int flexrm_spu_dma_map(struct device *dev, struct brcm_message *msg) | |
620 | { | |
621 | int rc; | |
622 | ||
623 | rc = dma_map_sg(dev, msg->spu.src, sg_nents(msg->spu.src), | |
624 | DMA_TO_DEVICE); | |
6b207ce8 JW |
625 | if (!rc) |
626 | return -EIO; | |
dbc049ee AP |
627 | |
628 | rc = dma_map_sg(dev, msg->spu.dst, sg_nents(msg->spu.dst), | |
629 | DMA_FROM_DEVICE); | |
6b207ce8 | 630 | if (!rc) { |
dbc049ee AP |
631 | dma_unmap_sg(dev, msg->spu.src, sg_nents(msg->spu.src), |
632 | DMA_TO_DEVICE); | |
6b207ce8 | 633 | return -EIO; |
dbc049ee AP |
634 | } |
635 | ||
636 | return 0; | |
637 | } | |
638 | ||
639 | static void flexrm_spu_dma_unmap(struct device *dev, struct brcm_message *msg) | |
640 | { | |
641 | dma_unmap_sg(dev, msg->spu.dst, sg_nents(msg->spu.dst), | |
642 | DMA_FROM_DEVICE); | |
643 | dma_unmap_sg(dev, msg->spu.src, sg_nents(msg->spu.src), | |
644 | DMA_TO_DEVICE); | |
645 | } | |
646 | ||
647 | static void *flexrm_spu_write_descs(struct brcm_message *msg, u32 nhcnt, | |
648 | u32 reqid, void *desc_ptr, u32 toggle, | |
649 | void *start_desc, void *end_desc) | |
650 | { | |
651 | u64 d; | |
652 | u32 nhpos = 0; | |
653 | void *orig_desc_ptr = desc_ptr; | |
654 | unsigned int dst_target = 0; | |
655 | struct scatterlist *src_sg = msg->spu.src, *dst_sg = msg->spu.dst; | |
656 | ||
657 | while (src_sg || dst_sg) { | |
658 | if (src_sg) { | |
659 | if (sg_dma_len(src_sg) & 0xf) | |
660 | d = flexrm_src_desc(sg_dma_address(src_sg), | |
661 | sg_dma_len(src_sg)); | |
662 | else | |
663 | d = flexrm_msrc_desc(sg_dma_address(src_sg), | |
664 | sg_dma_len(src_sg)/16); | |
665 | flexrm_enqueue_desc(nhpos, nhcnt, reqid, | |
666 | d, &desc_ptr, &toggle, | |
667 | start_desc, end_desc); | |
668 | nhpos++; | |
669 | dst_target = sg_dma_len(src_sg); | |
670 | src_sg = sg_next(src_sg); | |
671 | } else | |
672 | dst_target = UINT_MAX; | |
673 | ||
674 | while (dst_target && dst_sg) { | |
675 | if (sg_dma_len(dst_sg) & 0xf) | |
676 | d = flexrm_dst_desc(sg_dma_address(dst_sg), | |
677 | sg_dma_len(dst_sg)); | |
678 | else | |
679 | d = flexrm_mdst_desc(sg_dma_address(dst_sg), | |
680 | sg_dma_len(dst_sg)/16); | |
681 | flexrm_enqueue_desc(nhpos, nhcnt, reqid, | |
682 | d, &desc_ptr, &toggle, | |
683 | start_desc, end_desc); | |
684 | nhpos++; | |
685 | if (sg_dma_len(dst_sg) < dst_target) | |
686 | dst_target -= sg_dma_len(dst_sg); | |
687 | else | |
688 | dst_target = 0; | |
689 | dst_sg = sg_next(dst_sg); | |
690 | } | |
691 | } | |
692 | ||
693 | /* Null descriptor with invalid toggle bit */ | |
694 | flexrm_write_desc(desc_ptr, flexrm_null_desc(!toggle)); | |
695 | ||
696 | /* Ensure that descriptors have been written to memory */ | |
697 | wmb(); | |
698 | ||
699 | /* Flip toggle bit in header */ | |
462f668e | 700 | flexrm_flip_header_toggle(orig_desc_ptr); |
dbc049ee AP |
701 | |
702 | return desc_ptr; | |
703 | } | |
704 | ||
705 | static bool flexrm_sba_sanity_check(struct brcm_message *msg) | |
706 | { | |
707 | u32 i; | |
708 | ||
709 | if (!msg->sba.cmds || !msg->sba.cmds_count) | |
710 | return false; | |
711 | ||
712 | for (i = 0; i < msg->sba.cmds_count; i++) { | |
713 | if (((msg->sba.cmds[i].flags & BRCM_SBA_CMD_TYPE_B) || | |
714 | (msg->sba.cmds[i].flags & BRCM_SBA_CMD_TYPE_C)) && | |
715 | (msg->sba.cmds[i].flags & BRCM_SBA_CMD_HAS_OUTPUT)) | |
716 | return false; | |
717 | if ((msg->sba.cmds[i].flags & BRCM_SBA_CMD_TYPE_B) && | |
718 | (msg->sba.cmds[i].data_len > SRCT_LENGTH_MASK)) | |
719 | return false; | |
720 | if ((msg->sba.cmds[i].flags & BRCM_SBA_CMD_TYPE_C) && | |
721 | (msg->sba.cmds[i].data_len > SRCT_LENGTH_MASK)) | |
722 | return false; | |
723 | if ((msg->sba.cmds[i].flags & BRCM_SBA_CMD_HAS_RESP) && | |
724 | (msg->sba.cmds[i].resp_len > DSTT_LENGTH_MASK)) | |
725 | return false; | |
726 | if ((msg->sba.cmds[i].flags & BRCM_SBA_CMD_HAS_OUTPUT) && | |
727 | (msg->sba.cmds[i].data_len > DSTT_LENGTH_MASK)) | |
728 | return false; | |
729 | } | |
730 | ||
731 | return true; | |
732 | } | |
733 | ||
734 | static u32 flexrm_sba_estimate_nonheader_desc_count(struct brcm_message *msg) | |
735 | { | |
736 | u32 i, cnt; | |
737 | ||
738 | cnt = 0; | |
739 | for (i = 0; i < msg->sba.cmds_count; i++) { | |
740 | cnt++; | |
741 | ||
742 | if ((msg->sba.cmds[i].flags & BRCM_SBA_CMD_TYPE_B) || | |
743 | (msg->sba.cmds[i].flags & BRCM_SBA_CMD_TYPE_C)) | |
744 | cnt++; | |
745 | ||
746 | if (msg->sba.cmds[i].flags & BRCM_SBA_CMD_HAS_RESP) | |
747 | cnt++; | |
748 | ||
749 | if (msg->sba.cmds[i].flags & BRCM_SBA_CMD_HAS_OUTPUT) | |
750 | cnt++; | |
751 | } | |
752 | ||
753 | return cnt; | |
754 | } | |
755 | ||
756 | static void *flexrm_sba_write_descs(struct brcm_message *msg, u32 nhcnt, | |
757 | u32 reqid, void *desc_ptr, u32 toggle, | |
758 | void *start_desc, void *end_desc) | |
759 | { | |
760 | u64 d; | |
761 | u32 i, nhpos = 0; | |
762 | struct brcm_sba_command *c; | |
763 | void *orig_desc_ptr = desc_ptr; | |
764 | ||
765 | /* Convert SBA commands into descriptors */ | |
766 | for (i = 0; i < msg->sba.cmds_count; i++) { | |
767 | c = &msg->sba.cmds[i]; | |
768 | ||
769 | if ((c->flags & BRCM_SBA_CMD_HAS_RESP) && | |
770 | (c->flags & BRCM_SBA_CMD_HAS_OUTPUT)) { | |
771 | /* Destination response descriptor */ | |
772 | d = flexrm_dst_desc(c->resp, c->resp_len); | |
773 | flexrm_enqueue_desc(nhpos, nhcnt, reqid, | |
774 | d, &desc_ptr, &toggle, | |
775 | start_desc, end_desc); | |
776 | nhpos++; | |
777 | } else if (c->flags & BRCM_SBA_CMD_HAS_RESP) { | |
778 | /* Destination response with tlast descriptor */ | |
779 | d = flexrm_dstt_desc(c->resp, c->resp_len); | |
780 | flexrm_enqueue_desc(nhpos, nhcnt, reqid, | |
781 | d, &desc_ptr, &toggle, | |
782 | start_desc, end_desc); | |
783 | nhpos++; | |
784 | } | |
785 | ||
786 | if (c->flags & BRCM_SBA_CMD_HAS_OUTPUT) { | |
787 | /* Destination with tlast descriptor */ | |
788 | d = flexrm_dstt_desc(c->data, c->data_len); | |
789 | flexrm_enqueue_desc(nhpos, nhcnt, reqid, | |
790 | d, &desc_ptr, &toggle, | |
791 | start_desc, end_desc); | |
792 | nhpos++; | |
793 | } | |
794 | ||
795 | if (c->flags & BRCM_SBA_CMD_TYPE_B) { | |
796 | /* Command as immediate descriptor */ | |
797 | d = flexrm_imm_desc(c->cmd); | |
798 | flexrm_enqueue_desc(nhpos, nhcnt, reqid, | |
799 | d, &desc_ptr, &toggle, | |
800 | start_desc, end_desc); | |
801 | nhpos++; | |
802 | } else { | |
803 | /* Command as immediate descriptor with tlast */ | |
804 | d = flexrm_immt_desc(c->cmd); | |
805 | flexrm_enqueue_desc(nhpos, nhcnt, reqid, | |
806 | d, &desc_ptr, &toggle, | |
807 | start_desc, end_desc); | |
808 | nhpos++; | |
809 | } | |
810 | ||
811 | if ((c->flags & BRCM_SBA_CMD_TYPE_B) || | |
812 | (c->flags & BRCM_SBA_CMD_TYPE_C)) { | |
813 | /* Source with tlast descriptor */ | |
814 | d = flexrm_srct_desc(c->data, c->data_len); | |
815 | flexrm_enqueue_desc(nhpos, nhcnt, reqid, | |
816 | d, &desc_ptr, &toggle, | |
817 | start_desc, end_desc); | |
818 | nhpos++; | |
819 | } | |
820 | } | |
821 | ||
822 | /* Null descriptor with invalid toggle bit */ | |
823 | flexrm_write_desc(desc_ptr, flexrm_null_desc(!toggle)); | |
824 | ||
825 | /* Ensure that descriptors have been written to memory */ | |
826 | wmb(); | |
827 | ||
828 | /* Flip toggle bit in header */ | |
462f668e | 829 | flexrm_flip_header_toggle(orig_desc_ptr); |
dbc049ee AP |
830 | |
831 | return desc_ptr; | |
832 | } | |
833 | ||
834 | static bool flexrm_sanity_check(struct brcm_message *msg) | |
835 | { | |
836 | if (!msg) | |
837 | return false; | |
838 | ||
839 | switch (msg->type) { | |
840 | case BRCM_MESSAGE_SPU: | |
841 | return flexrm_spu_sanity_check(msg); | |
842 | case BRCM_MESSAGE_SBA: | |
843 | return flexrm_sba_sanity_check(msg); | |
844 | default: | |
845 | return false; | |
846 | }; | |
847 | } | |
848 | ||
849 | static u32 flexrm_estimate_nonheader_desc_count(struct brcm_message *msg) | |
850 | { | |
851 | if (!msg) | |
852 | return 0; | |
853 | ||
854 | switch (msg->type) { | |
855 | case BRCM_MESSAGE_SPU: | |
856 | return flexrm_spu_estimate_nonheader_desc_count(msg); | |
857 | case BRCM_MESSAGE_SBA: | |
858 | return flexrm_sba_estimate_nonheader_desc_count(msg); | |
859 | default: | |
860 | return 0; | |
861 | }; | |
862 | } | |
863 | ||
864 | static int flexrm_dma_map(struct device *dev, struct brcm_message *msg) | |
865 | { | |
866 | if (!dev || !msg) | |
867 | return -EINVAL; | |
868 | ||
869 | switch (msg->type) { | |
870 | case BRCM_MESSAGE_SPU: | |
871 | return flexrm_spu_dma_map(dev, msg); | |
872 | default: | |
873 | break; | |
874 | } | |
875 | ||
876 | return 0; | |
877 | } | |
878 | ||
879 | static void flexrm_dma_unmap(struct device *dev, struct brcm_message *msg) | |
880 | { | |
881 | if (!dev || !msg) | |
882 | return; | |
883 | ||
884 | switch (msg->type) { | |
885 | case BRCM_MESSAGE_SPU: | |
886 | flexrm_spu_dma_unmap(dev, msg); | |
887 | break; | |
888 | default: | |
889 | break; | |
890 | } | |
891 | } | |
892 | ||
893 | static void *flexrm_write_descs(struct brcm_message *msg, u32 nhcnt, | |
894 | u32 reqid, void *desc_ptr, u32 toggle, | |
895 | void *start_desc, void *end_desc) | |
896 | { | |
897 | if (!msg || !desc_ptr || !start_desc || !end_desc) | |
898 | return ERR_PTR(-ENOTSUPP); | |
899 | ||
900 | if ((desc_ptr < start_desc) || (end_desc <= desc_ptr)) | |
901 | return ERR_PTR(-ERANGE); | |
902 | ||
903 | switch (msg->type) { | |
904 | case BRCM_MESSAGE_SPU: | |
905 | return flexrm_spu_write_descs(msg, nhcnt, reqid, | |
906 | desc_ptr, toggle, | |
907 | start_desc, end_desc); | |
908 | case BRCM_MESSAGE_SBA: | |
909 | return flexrm_sba_write_descs(msg, nhcnt, reqid, | |
910 | desc_ptr, toggle, | |
911 | start_desc, end_desc); | |
912 | default: | |
913 | return ERR_PTR(-ENOTSUPP); | |
914 | }; | |
915 | } | |
916 | ||
917 | /* ====== FlexRM driver helper routines ===== */ | |
918 | ||
acf7e50a AP |
919 | static void flexrm_write_config_in_seqfile(struct flexrm_mbox *mbox, |
920 | struct seq_file *file) | |
921 | { | |
922 | int i; | |
923 | const char *state; | |
924 | struct flexrm_ring *ring; | |
925 | ||
926 | seq_printf(file, "%-5s %-9s %-18s %-10s %-18s %-10s\n", | |
927 | "Ring#", "State", "BD_Addr", "BD_Size", | |
928 | "Cmpl_Addr", "Cmpl_Size"); | |
929 | ||
930 | for (i = 0; i < mbox->num_rings; i++) { | |
931 | ring = &mbox->rings[i]; | |
932 | if (readl(ring->regs + RING_CONTROL) & | |
933 | BIT(CONTROL_ACTIVE_SHIFT)) | |
934 | state = "active"; | |
935 | else | |
936 | state = "inactive"; | |
937 | seq_printf(file, | |
938 | "%-5d %-9s 0x%016llx 0x%08x 0x%016llx 0x%08x\n", | |
939 | ring->num, state, | |
940 | (unsigned long long)ring->bd_dma_base, | |
941 | (u32)RING_BD_SIZE, | |
942 | (unsigned long long)ring->cmpl_dma_base, | |
943 | (u32)RING_CMPL_SIZE); | |
944 | } | |
945 | } | |
946 | ||
947 | static void flexrm_write_stats_in_seqfile(struct flexrm_mbox *mbox, | |
948 | struct seq_file *file) | |
949 | { | |
950 | int i; | |
951 | u32 val, bd_read_offset; | |
952 | struct flexrm_ring *ring; | |
953 | ||
954 | seq_printf(file, "%-5s %-10s %-10s %-10s %-11s %-11s\n", | |
955 | "Ring#", "BD_Read", "BD_Write", | |
956 | "Cmpl_Read", "Submitted", "Completed"); | |
957 | ||
958 | for (i = 0; i < mbox->num_rings; i++) { | |
959 | ring = &mbox->rings[i]; | |
960 | bd_read_offset = readl_relaxed(ring->regs + RING_BD_READ_PTR); | |
961 | val = readl_relaxed(ring->regs + RING_BD_START_ADDR); | |
962 | bd_read_offset *= RING_DESC_SIZE; | |
963 | bd_read_offset += (u32)(BD_START_ADDR_DECODE(val) - | |
964 | ring->bd_dma_base); | |
965 | seq_printf(file, "%-5d 0x%08x 0x%08x 0x%08x %-11d %-11d\n", | |
966 | ring->num, | |
967 | (u32)bd_read_offset, | |
968 | (u32)ring->bd_write_offset, | |
969 | (u32)ring->cmpl_read_offset, | |
970 | (u32)atomic_read(&ring->msg_send_count), | |
971 | (u32)atomic_read(&ring->msg_cmpl_count)); | |
972 | } | |
973 | } | |
974 | ||
dbc049ee AP |
975 | static int flexrm_new_request(struct flexrm_ring *ring, |
976 | struct brcm_message *batch_msg, | |
977 | struct brcm_message *msg) | |
978 | { | |
979 | void *next; | |
980 | unsigned long flags; | |
981 | u32 val, count, nhcnt; | |
982 | u32 read_offset, write_offset; | |
983 | bool exit_cleanup = false; | |
984 | int ret = 0, reqid; | |
985 | ||
986 | /* Do sanity check on message */ | |
987 | if (!flexrm_sanity_check(msg)) | |
988 | return -EIO; | |
989 | msg->error = 0; | |
990 | ||
991 | /* If no requests possible then save data pointer and goto done. */ | |
1f7466c6 AP |
992 | spin_lock_irqsave(&ring->lock, flags); |
993 | reqid = bitmap_find_free_region(ring->requests_bmap, | |
994 | RING_MAX_REQ_COUNT, 0); | |
1f7466c6 | 995 | spin_unlock_irqrestore(&ring->lock, flags); |
1da92afb AP |
996 | if (reqid < 0) |
997 | return -ENOSPC; | |
dbc049ee AP |
998 | ring->requests[reqid] = msg; |
999 | ||
1000 | /* Do DMA mappings for the message */ | |
1001 | ret = flexrm_dma_map(ring->mbox->dev, msg); | |
1002 | if (ret < 0) { | |
1003 | ring->requests[reqid] = NULL; | |
1f7466c6 AP |
1004 | spin_lock_irqsave(&ring->lock, flags); |
1005 | bitmap_release_region(ring->requests_bmap, reqid, 0); | |
1006 | spin_unlock_irqrestore(&ring->lock, flags); | |
dbc049ee AP |
1007 | return ret; |
1008 | } | |
1009 | ||
dbc049ee AP |
1010 | /* Determine current HW BD read offset */ |
1011 | read_offset = readl_relaxed(ring->regs + RING_BD_READ_PTR); | |
1012 | val = readl_relaxed(ring->regs + RING_BD_START_ADDR); | |
1013 | read_offset *= RING_DESC_SIZE; | |
1014 | read_offset += (u32)(BD_START_ADDR_DECODE(val) - ring->bd_dma_base); | |
1015 | ||
1016 | /* | |
1017 | * Number required descriptors = number of non-header descriptors + | |
1018 | * number of header descriptors + | |
1019 | * 1x null descriptor | |
1020 | */ | |
1021 | nhcnt = flexrm_estimate_nonheader_desc_count(msg); | |
1022 | count = flexrm_estimate_header_desc_count(nhcnt) + nhcnt + 1; | |
1023 | ||
1024 | /* Check for available descriptor space. */ | |
1025 | write_offset = ring->bd_write_offset; | |
1026 | while (count) { | |
1027 | if (!flexrm_is_next_table_desc(ring->bd_base + write_offset)) | |
1028 | count--; | |
1029 | write_offset += RING_DESC_SIZE; | |
1030 | if (write_offset == RING_BD_SIZE) | |
1031 | write_offset = 0x0; | |
1032 | if (write_offset == read_offset) | |
1033 | break; | |
1034 | } | |
1035 | if (count) { | |
1da92afb | 1036 | ret = -ENOSPC; |
dbc049ee AP |
1037 | exit_cleanup = true; |
1038 | goto exit; | |
1039 | } | |
1040 | ||
1041 | /* Write descriptors to ring */ | |
1042 | next = flexrm_write_descs(msg, nhcnt, reqid, | |
1043 | ring->bd_base + ring->bd_write_offset, | |
1044 | RING_BD_TOGGLE_VALID(ring->bd_write_offset), | |
1045 | ring->bd_base, ring->bd_base + RING_BD_SIZE); | |
1046 | if (IS_ERR(next)) { | |
1047 | ret = PTR_ERR(next); | |
1048 | exit_cleanup = true; | |
1049 | goto exit; | |
1050 | } | |
1051 | ||
1052 | /* Save ring BD write offset */ | |
1053 | ring->bd_write_offset = (unsigned long)(next - ring->bd_base); | |
1054 | ||
acf7e50a AP |
1055 | /* Increment number of messages sent */ |
1056 | atomic_inc_return(&ring->msg_send_count); | |
1057 | ||
dbc049ee AP |
1058 | exit: |
1059 | /* Update error status in message */ | |
1060 | msg->error = ret; | |
1061 | ||
1062 | /* Cleanup if we failed */ | |
1063 | if (exit_cleanup) { | |
1064 | flexrm_dma_unmap(ring->mbox->dev, msg); | |
1065 | ring->requests[reqid] = NULL; | |
1f7466c6 AP |
1066 | spin_lock_irqsave(&ring->lock, flags); |
1067 | bitmap_release_region(ring->requests_bmap, reqid, 0); | |
1068 | spin_unlock_irqrestore(&ring->lock, flags); | |
dbc049ee AP |
1069 | } |
1070 | ||
1071 | return ret; | |
1072 | } | |
1073 | ||
1074 | static int flexrm_process_completions(struct flexrm_ring *ring) | |
1075 | { | |
1076 | u64 desc; | |
1077 | int err, count = 0; | |
1078 | unsigned long flags; | |
1079 | struct brcm_message *msg = NULL; | |
1080 | u32 reqid, cmpl_read_offset, cmpl_write_offset; | |
1081 | struct mbox_chan *chan = &ring->mbox->controller.chans[ring->num]; | |
1082 | ||
1083 | spin_lock_irqsave(&ring->lock, flags); | |
1084 | ||
dbc049ee AP |
1085 | /* |
1086 | * Get current completion read and write offset | |
1087 | * | |
9d2e8b93 | 1088 | * Note: We should read completion write pointer at least once |
dbc049ee AP |
1089 | * after we get a MSI interrupt because HW maintains internal |
1090 | * MSI status which will allow next MSI interrupt only after | |
1091 | * completion write pointer is read. | |
1092 | */ | |
1093 | cmpl_write_offset = readl_relaxed(ring->regs + RING_CMPL_WRITE_PTR); | |
1094 | cmpl_write_offset *= RING_DESC_SIZE; | |
1095 | cmpl_read_offset = ring->cmpl_read_offset; | |
1096 | ring->cmpl_read_offset = cmpl_write_offset; | |
1097 | ||
1098 | spin_unlock_irqrestore(&ring->lock, flags); | |
1099 | ||
dbc049ee AP |
1100 | /* For each completed request notify mailbox clients */ |
1101 | reqid = 0; | |
1102 | while (cmpl_read_offset != cmpl_write_offset) { | |
1103 | /* Dequeue next completion descriptor */ | |
1104 | desc = *((u64 *)(ring->cmpl_base + cmpl_read_offset)); | |
1105 | ||
1106 | /* Next read offset */ | |
1107 | cmpl_read_offset += RING_DESC_SIZE; | |
1108 | if (cmpl_read_offset == RING_CMPL_SIZE) | |
1109 | cmpl_read_offset = 0; | |
1110 | ||
1111 | /* Decode error from completion descriptor */ | |
1112 | err = flexrm_cmpl_desc_to_error(desc); | |
1113 | if (err < 0) { | |
1114 | dev_warn(ring->mbox->dev, | |
ca194c38 AP |
1115 | "ring%d got completion desc=0x%lx with error %d\n", |
1116 | ring->num, (unsigned long)desc, err); | |
dbc049ee AP |
1117 | } |
1118 | ||
1119 | /* Determine request id from completion descriptor */ | |
1120 | reqid = flexrm_cmpl_desc_to_reqid(desc); | |
1121 | ||
1122 | /* Determine message pointer based on reqid */ | |
1123 | msg = ring->requests[reqid]; | |
1124 | if (!msg) { | |
1125 | dev_warn(ring->mbox->dev, | |
ca194c38 AP |
1126 | "ring%d null msg pointer for completion desc=0x%lx\n", |
1127 | ring->num, (unsigned long)desc); | |
dbc049ee AP |
1128 | continue; |
1129 | } | |
1130 | ||
1131 | /* Release reqid for recycling */ | |
1132 | ring->requests[reqid] = NULL; | |
1f7466c6 AP |
1133 | spin_lock_irqsave(&ring->lock, flags); |
1134 | bitmap_release_region(ring->requests_bmap, reqid, 0); | |
1135 | spin_unlock_irqrestore(&ring->lock, flags); | |
dbc049ee AP |
1136 | |
1137 | /* Unmap DMA mappings */ | |
1138 | flexrm_dma_unmap(ring->mbox->dev, msg); | |
1139 | ||
1140 | /* Give-back message to mailbox client */ | |
1141 | msg->error = err; | |
1142 | mbox_chan_received_data(chan, msg); | |
1143 | ||
1144 | /* Increment number of completions processed */ | |
acf7e50a | 1145 | atomic_inc_return(&ring->msg_cmpl_count); |
dbc049ee AP |
1146 | count++; |
1147 | } | |
1148 | ||
1149 | return count; | |
1150 | } | |
1151 | ||
acf7e50a AP |
1152 | /* ====== FlexRM Debugfs callbacks ====== */ |
1153 | ||
1154 | static int flexrm_debugfs_conf_show(struct seq_file *file, void *offset) | |
1155 | { | |
7836922d | 1156 | struct flexrm_mbox *mbox = dev_get_drvdata(file->private); |
acf7e50a AP |
1157 | |
1158 | /* Write config in file */ | |
1159 | flexrm_write_config_in_seqfile(mbox, file); | |
1160 | ||
1161 | return 0; | |
1162 | } | |
1163 | ||
1164 | static int flexrm_debugfs_stats_show(struct seq_file *file, void *offset) | |
1165 | { | |
7836922d | 1166 | struct flexrm_mbox *mbox = dev_get_drvdata(file->private); |
acf7e50a AP |
1167 | |
1168 | /* Write stats in file */ | |
1169 | flexrm_write_stats_in_seqfile(mbox, file); | |
1170 | ||
1171 | return 0; | |
1172 | } | |
1173 | ||
dbc049ee AP |
1174 | /* ====== FlexRM interrupt handler ===== */ |
1175 | ||
1176 | static irqreturn_t flexrm_irq_event(int irq, void *dev_id) | |
1177 | { | |
1178 | /* We only have MSI for completions so just wakeup IRQ thread */ | |
1179 | /* Ring related errors will be informed via completion descriptors */ | |
1180 | ||
1181 | return IRQ_WAKE_THREAD; | |
1182 | } | |
1183 | ||
1184 | static irqreturn_t flexrm_irq_thread(int irq, void *dev_id) | |
1185 | { | |
1186 | flexrm_process_completions(dev_id); | |
1187 | ||
1188 | return IRQ_HANDLED; | |
1189 | } | |
1190 | ||
1191 | /* ====== FlexRM mailbox callbacks ===== */ | |
1192 | ||
1193 | static int flexrm_send_data(struct mbox_chan *chan, void *data) | |
1194 | { | |
1195 | int i, rc; | |
1196 | struct flexrm_ring *ring = chan->con_priv; | |
1197 | struct brcm_message *msg = data; | |
1198 | ||
1199 | if (msg->type == BRCM_MESSAGE_BATCH) { | |
1200 | for (i = msg->batch.msgs_queued; | |
1201 | i < msg->batch.msgs_count; i++) { | |
1202 | rc = flexrm_new_request(ring, msg, | |
1203 | &msg->batch.msgs[i]); | |
1204 | if (rc) { | |
1205 | msg->error = rc; | |
1206 | return rc; | |
1207 | } | |
1208 | msg->batch.msgs_queued++; | |
1209 | } | |
1210 | return 0; | |
1211 | } | |
1212 | ||
1213 | return flexrm_new_request(ring, NULL, data); | |
1214 | } | |
1215 | ||
1216 | static bool flexrm_peek_data(struct mbox_chan *chan) | |
1217 | { | |
1218 | int cnt = flexrm_process_completions(chan->con_priv); | |
1219 | ||
1220 | return (cnt > 0) ? true : false; | |
1221 | } | |
1222 | ||
1223 | static int flexrm_startup(struct mbox_chan *chan) | |
1224 | { | |
1225 | u64 d; | |
1226 | u32 val, off; | |
1227 | int ret = 0; | |
1228 | dma_addr_t next_addr; | |
1229 | struct flexrm_ring *ring = chan->con_priv; | |
1230 | ||
1231 | /* Allocate BD memory */ | |
1232 | ring->bd_base = dma_pool_alloc(ring->mbox->bd_pool, | |
1233 | GFP_KERNEL, &ring->bd_dma_base); | |
1234 | if (!ring->bd_base) { | |
ca194c38 AP |
1235 | dev_err(ring->mbox->dev, |
1236 | "can't allocate BD memory for ring%d\n", | |
1237 | ring->num); | |
dbc049ee AP |
1238 | ret = -ENOMEM; |
1239 | goto fail; | |
1240 | } | |
1241 | ||
1242 | /* Configure next table pointer entries in BD memory */ | |
1243 | for (off = 0; off < RING_BD_SIZE; off += RING_DESC_SIZE) { | |
1244 | next_addr = off + RING_DESC_SIZE; | |
1245 | if (next_addr == RING_BD_SIZE) | |
1246 | next_addr = 0; | |
1247 | next_addr += ring->bd_dma_base; | |
1248 | if (RING_BD_ALIGN_CHECK(next_addr)) | |
1249 | d = flexrm_next_table_desc(RING_BD_TOGGLE_VALID(off), | |
1250 | next_addr); | |
1251 | else | |
1252 | d = flexrm_null_desc(RING_BD_TOGGLE_INVALID(off)); | |
1253 | flexrm_write_desc(ring->bd_base + off, d); | |
1254 | } | |
1255 | ||
1256 | /* Allocate completion memory */ | |
6de84023 | 1257 | ring->cmpl_base = dma_pool_zalloc(ring->mbox->cmpl_pool, |
dbc049ee AP |
1258 | GFP_KERNEL, &ring->cmpl_dma_base); |
1259 | if (!ring->cmpl_base) { | |
ca194c38 AP |
1260 | dev_err(ring->mbox->dev, |
1261 | "can't allocate completion memory for ring%d\n", | |
1262 | ring->num); | |
dbc049ee AP |
1263 | ret = -ENOMEM; |
1264 | goto fail_free_bd_memory; | |
1265 | } | |
dbc049ee AP |
1266 | |
1267 | /* Request IRQ */ | |
1268 | if (ring->irq == UINT_MAX) { | |
ca194c38 AP |
1269 | dev_err(ring->mbox->dev, |
1270 | "ring%d IRQ not available\n", ring->num); | |
dbc049ee AP |
1271 | ret = -ENODEV; |
1272 | goto fail_free_cmpl_memory; | |
1273 | } | |
1274 | ret = request_threaded_irq(ring->irq, | |
1275 | flexrm_irq_event, | |
1276 | flexrm_irq_thread, | |
1277 | 0, dev_name(ring->mbox->dev), ring); | |
1278 | if (ret) { | |
ca194c38 AP |
1279 | dev_err(ring->mbox->dev, |
1280 | "failed to request ring%d IRQ\n", ring->num); | |
dbc049ee AP |
1281 | goto fail_free_cmpl_memory; |
1282 | } | |
1283 | ring->irq_requested = true; | |
1284 | ||
6ac17fe8 AP |
1285 | /* Set IRQ affinity hint */ |
1286 | ring->irq_aff_hint = CPU_MASK_NONE; | |
1287 | val = ring->mbox->num_rings; | |
1288 | val = (num_online_cpus() < val) ? val / num_online_cpus() : 1; | |
1289 | cpumask_set_cpu((ring->num / val) % num_online_cpus(), | |
1290 | &ring->irq_aff_hint); | |
bf886e1e | 1291 | ret = irq_update_affinity_hint(ring->irq, &ring->irq_aff_hint); |
6ac17fe8 | 1292 | if (ret) { |
ca194c38 AP |
1293 | dev_err(ring->mbox->dev, |
1294 | "failed to set IRQ affinity hint for ring%d\n", | |
1295 | ring->num); | |
6ac17fe8 AP |
1296 | goto fail_free_irq; |
1297 | } | |
1298 | ||
dbc049ee AP |
1299 | /* Disable/inactivate ring */ |
1300 | writel_relaxed(0x0, ring->regs + RING_CONTROL); | |
1301 | ||
1302 | /* Program BD start address */ | |
1303 | val = BD_START_ADDR_VALUE(ring->bd_dma_base); | |
1304 | writel_relaxed(val, ring->regs + RING_BD_START_ADDR); | |
1305 | ||
1306 | /* BD write pointer will be same as HW write pointer */ | |
1307 | ring->bd_write_offset = | |
1308 | readl_relaxed(ring->regs + RING_BD_WRITE_PTR); | |
1309 | ring->bd_write_offset *= RING_DESC_SIZE; | |
1310 | ||
1311 | /* Program completion start address */ | |
1312 | val = CMPL_START_ADDR_VALUE(ring->cmpl_dma_base); | |
1313 | writel_relaxed(val, ring->regs + RING_CMPL_START_ADDR); | |
1314 | ||
dbc049ee AP |
1315 | /* Completion read pointer will be same as HW write pointer */ |
1316 | ring->cmpl_read_offset = | |
1317 | readl_relaxed(ring->regs + RING_CMPL_WRITE_PTR); | |
1318 | ring->cmpl_read_offset *= RING_DESC_SIZE; | |
1319 | ||
1320 | /* Read ring Tx, Rx, and Outstanding counts to clear */ | |
1321 | readl_relaxed(ring->regs + RING_NUM_REQ_RECV_LS); | |
1322 | readl_relaxed(ring->regs + RING_NUM_REQ_RECV_MS); | |
1323 | readl_relaxed(ring->regs + RING_NUM_REQ_TRANS_LS); | |
1324 | readl_relaxed(ring->regs + RING_NUM_REQ_TRANS_MS); | |
1325 | readl_relaxed(ring->regs + RING_NUM_REQ_OUTSTAND); | |
1326 | ||
1327 | /* Configure RING_MSI_CONTROL */ | |
1328 | val = 0; | |
1329 | val |= (ring->msi_timer_val << MSI_TIMER_VAL_SHIFT); | |
1330 | val |= BIT(MSI_ENABLE_SHIFT); | |
1331 | val |= (ring->msi_count_threshold & MSI_COUNT_MASK) << MSI_COUNT_SHIFT; | |
1332 | writel_relaxed(val, ring->regs + RING_MSI_CONTROL); | |
1333 | ||
1334 | /* Enable/activate ring */ | |
1335 | val = BIT(CONTROL_ACTIVE_SHIFT); | |
1336 | writel_relaxed(val, ring->regs + RING_CONTROL); | |
1337 | ||
acf7e50a AP |
1338 | /* Reset stats to zero */ |
1339 | atomic_set(&ring->msg_send_count, 0); | |
1340 | atomic_set(&ring->msg_cmpl_count, 0); | |
1341 | ||
dbc049ee AP |
1342 | return 0; |
1343 | ||
6ac17fe8 AP |
1344 | fail_free_irq: |
1345 | free_irq(ring->irq, ring); | |
1346 | ring->irq_requested = false; | |
dbc049ee AP |
1347 | fail_free_cmpl_memory: |
1348 | dma_pool_free(ring->mbox->cmpl_pool, | |
1349 | ring->cmpl_base, ring->cmpl_dma_base); | |
1350 | ring->cmpl_base = NULL; | |
1351 | fail_free_bd_memory: | |
1352 | dma_pool_free(ring->mbox->bd_pool, | |
1353 | ring->bd_base, ring->bd_dma_base); | |
1354 | ring->bd_base = NULL; | |
1355 | fail: | |
1356 | return ret; | |
1357 | } | |
1358 | ||
1359 | static void flexrm_shutdown(struct mbox_chan *chan) | |
1360 | { | |
1361 | u32 reqid; | |
1362 | unsigned int timeout; | |
1363 | struct brcm_message *msg; | |
1364 | struct flexrm_ring *ring = chan->con_priv; | |
1365 | ||
1366 | /* Disable/inactivate ring */ | |
1367 | writel_relaxed(0x0, ring->regs + RING_CONTROL); | |
1368 | ||
a371c10e AP |
1369 | /* Set ring flush state */ |
1370 | timeout = 1000; /* timeout of 1s */ | |
dbc049ee AP |
1371 | writel_relaxed(BIT(CONTROL_FLUSH_SHIFT), |
1372 | ring->regs + RING_CONTROL); | |
1373 | do { | |
1374 | if (readl_relaxed(ring->regs + RING_FLUSH_DONE) & | |
1375 | FLUSH_DONE_MASK) | |
1376 | break; | |
1377 | mdelay(1); | |
a371c10e AP |
1378 | } while (--timeout); |
1379 | if (!timeout) | |
1380 | dev_err(ring->mbox->dev, | |
1381 | "setting ring%d flush state timedout\n", ring->num); | |
1382 | ||
1383 | /* Clear ring flush state */ | |
1384 | timeout = 1000; /* timeout of 1s */ | |
d7bf31a0 | 1385 | writel_relaxed(0x0, ring->regs + RING_CONTROL); |
a371c10e | 1386 | do { |
d7bf31a0 | 1387 | if (!(readl_relaxed(ring->regs + RING_FLUSH_DONE) & |
a371c10e AP |
1388 | FLUSH_DONE_MASK)) |
1389 | break; | |
1390 | mdelay(1); | |
1391 | } while (--timeout); | |
1392 | if (!timeout) | |
1393 | dev_err(ring->mbox->dev, | |
1394 | "clearing ring%d flush state timedout\n", ring->num); | |
dbc049ee AP |
1395 | |
1396 | /* Abort all in-flight requests */ | |
1397 | for (reqid = 0; reqid < RING_MAX_REQ_COUNT; reqid++) { | |
1398 | msg = ring->requests[reqid]; | |
1399 | if (!msg) | |
1400 | continue; | |
1401 | ||
1402 | /* Release reqid for recycling */ | |
1403 | ring->requests[reqid] = NULL; | |
dbc049ee AP |
1404 | |
1405 | /* Unmap DMA mappings */ | |
1406 | flexrm_dma_unmap(ring->mbox->dev, msg); | |
1407 | ||
1408 | /* Give-back message to mailbox client */ | |
1409 | msg->error = -EIO; | |
1410 | mbox_chan_received_data(chan, msg); | |
1411 | } | |
1412 | ||
1f7466c6 AP |
1413 | /* Clear requests bitmap */ |
1414 | bitmap_zero(ring->requests_bmap, RING_MAX_REQ_COUNT); | |
1415 | ||
dbc049ee AP |
1416 | /* Release IRQ */ |
1417 | if (ring->irq_requested) { | |
bf886e1e | 1418 | irq_update_affinity_hint(ring->irq, NULL); |
dbc049ee AP |
1419 | free_irq(ring->irq, ring); |
1420 | ring->irq_requested = false; | |
1421 | } | |
1422 | ||
1423 | /* Free-up completion descriptor ring */ | |
1424 | if (ring->cmpl_base) { | |
1425 | dma_pool_free(ring->mbox->cmpl_pool, | |
1426 | ring->cmpl_base, ring->cmpl_dma_base); | |
1427 | ring->cmpl_base = NULL; | |
1428 | } | |
1429 | ||
1430 | /* Free-up BD descriptor ring */ | |
1431 | if (ring->bd_base) { | |
1432 | dma_pool_free(ring->mbox->bd_pool, | |
1433 | ring->bd_base, ring->bd_dma_base); | |
1434 | ring->bd_base = NULL; | |
1435 | } | |
1436 | } | |
1437 | ||
dbc049ee AP |
1438 | static const struct mbox_chan_ops flexrm_mbox_chan_ops = { |
1439 | .send_data = flexrm_send_data, | |
1440 | .startup = flexrm_startup, | |
1441 | .shutdown = flexrm_shutdown, | |
dbc049ee AP |
1442 | .peek_data = flexrm_peek_data, |
1443 | }; | |
1444 | ||
1445 | static struct mbox_chan *flexrm_mbox_of_xlate(struct mbox_controller *cntlr, | |
1446 | const struct of_phandle_args *pa) | |
1447 | { | |
1448 | struct mbox_chan *chan; | |
1449 | struct flexrm_ring *ring; | |
1450 | ||
1451 | if (pa->args_count < 3) | |
1452 | return ERR_PTR(-EINVAL); | |
1453 | ||
1454 | if (pa->args[0] >= cntlr->num_chans) | |
1455 | return ERR_PTR(-ENOENT); | |
1456 | ||
1457 | if (pa->args[1] > MSI_COUNT_MASK) | |
1458 | return ERR_PTR(-EINVAL); | |
1459 | ||
1460 | if (pa->args[2] > MSI_TIMER_VAL_MASK) | |
1461 | return ERR_PTR(-EINVAL); | |
1462 | ||
1463 | chan = &cntlr->chans[pa->args[0]]; | |
1464 | ring = chan->con_priv; | |
1465 | ring->msi_count_threshold = pa->args[1]; | |
1466 | ring->msi_timer_val = pa->args[2]; | |
1467 | ||
1468 | return chan; | |
1469 | } | |
1470 | ||
1471 | /* ====== FlexRM platform driver ===== */ | |
1472 | ||
1473 | static void flexrm_mbox_msi_write(struct msi_desc *desc, struct msi_msg *msg) | |
1474 | { | |
1475 | struct device *dev = msi_desc_to_dev(desc); | |
1476 | struct flexrm_mbox *mbox = dev_get_drvdata(dev); | |
dba27c7f | 1477 | struct flexrm_ring *ring = &mbox->rings[desc->msi_index]; |
dbc049ee AP |
1478 | |
1479 | /* Configure per-Ring MSI registers */ | |
1480 | writel_relaxed(msg->address_lo, ring->regs + RING_MSI_ADDR_LS); | |
1481 | writel_relaxed(msg->address_hi, ring->regs + RING_MSI_ADDR_MS); | |
1482 | writel_relaxed(msg->data, ring->regs + RING_MSI_DATA_VALUE); | |
1483 | } | |
1484 | ||
1485 | static int flexrm_mbox_probe(struct platform_device *pdev) | |
1486 | { | |
1487 | int index, ret = 0; | |
1488 | void __iomem *regs; | |
1489 | void __iomem *regs_end; | |
dbc049ee AP |
1490 | struct resource *iomem; |
1491 | struct flexrm_ring *ring; | |
1492 | struct flexrm_mbox *mbox; | |
1493 | struct device *dev = &pdev->dev; | |
1494 | ||
1495 | /* Allocate driver mailbox struct */ | |
1496 | mbox = devm_kzalloc(dev, sizeof(*mbox), GFP_KERNEL); | |
1497 | if (!mbox) { | |
1498 | ret = -ENOMEM; | |
1499 | goto fail; | |
1500 | } | |
1501 | mbox->dev = dev; | |
1502 | platform_set_drvdata(pdev, mbox); | |
1503 | ||
1504 | /* Get resource for registers */ | |
1505 | iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1506 | if (!iomem || (resource_size(iomem) < RING_REGS_SIZE)) { | |
1507 | ret = -ENODEV; | |
1508 | goto fail; | |
1509 | } | |
1510 | ||
1511 | /* Map registers of all rings */ | |
1512 | mbox->regs = devm_ioremap_resource(&pdev->dev, iomem); | |
1513 | if (IS_ERR(mbox->regs)) { | |
1514 | ret = PTR_ERR(mbox->regs); | |
dbc049ee AP |
1515 | goto fail; |
1516 | } | |
1517 | regs_end = mbox->regs + resource_size(iomem); | |
1518 | ||
1519 | /* Scan and count available rings */ | |
1520 | mbox->num_rings = 0; | |
1521 | for (regs = mbox->regs; regs < regs_end; regs += RING_REGS_SIZE) { | |
1522 | if (readl_relaxed(regs + RING_VER) == RING_VER_MAGIC) | |
1523 | mbox->num_rings++; | |
1524 | } | |
1525 | if (!mbox->num_rings) { | |
1526 | ret = -ENODEV; | |
1527 | goto fail; | |
1528 | } | |
1529 | ||
1530 | /* Allocate driver ring structs */ | |
1531 | ring = devm_kcalloc(dev, mbox->num_rings, sizeof(*ring), GFP_KERNEL); | |
1532 | if (!ring) { | |
1533 | ret = -ENOMEM; | |
1534 | goto fail; | |
1535 | } | |
1536 | mbox->rings = ring; | |
1537 | ||
1538 | /* Initialize members of driver ring structs */ | |
1539 | regs = mbox->regs; | |
1540 | for (index = 0; index < mbox->num_rings; index++) { | |
1541 | ring = &mbox->rings[index]; | |
1542 | ring->num = index; | |
1543 | ring->mbox = mbox; | |
1544 | while ((regs < regs_end) && | |
1545 | (readl_relaxed(regs + RING_VER) != RING_VER_MAGIC)) | |
1546 | regs += RING_REGS_SIZE; | |
1547 | if (regs_end <= regs) { | |
1548 | ret = -ENODEV; | |
1549 | goto fail; | |
1550 | } | |
1551 | ring->regs = regs; | |
1552 | regs += RING_REGS_SIZE; | |
1553 | ring->irq = UINT_MAX; | |
1554 | ring->irq_requested = false; | |
1555 | ring->msi_timer_val = MSI_TIMER_VAL_MASK; | |
1556 | ring->msi_count_threshold = 0x1; | |
dbc049ee AP |
1557 | memset(ring->requests, 0, sizeof(ring->requests)); |
1558 | ring->bd_base = NULL; | |
1559 | ring->bd_dma_base = 0; | |
1560 | ring->cmpl_base = NULL; | |
1561 | ring->cmpl_dma_base = 0; | |
acf7e50a AP |
1562 | atomic_set(&ring->msg_send_count, 0); |
1563 | atomic_set(&ring->msg_cmpl_count, 0); | |
dbc049ee | 1564 | spin_lock_init(&ring->lock); |
1f7466c6 | 1565 | bitmap_zero(ring->requests_bmap, RING_MAX_REQ_COUNT); |
dbc049ee AP |
1566 | ring->cmpl_read_offset = 0; |
1567 | } | |
1568 | ||
1569 | /* FlexRM is capable of 40-bit physical addresses only */ | |
1570 | ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(40)); | |
1571 | if (ret) { | |
1572 | ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); | |
1573 | if (ret) | |
1574 | goto fail; | |
1575 | } | |
1576 | ||
1577 | /* Create DMA pool for ring BD memory */ | |
1578 | mbox->bd_pool = dma_pool_create("bd", dev, RING_BD_SIZE, | |
1579 | 1 << RING_BD_ALIGN_ORDER, 0); | |
1580 | if (!mbox->bd_pool) { | |
1581 | ret = -ENOMEM; | |
1582 | goto fail; | |
1583 | } | |
1584 | ||
1585 | /* Create DMA pool for ring completion memory */ | |
1586 | mbox->cmpl_pool = dma_pool_create("cmpl", dev, RING_CMPL_SIZE, | |
1587 | 1 << RING_CMPL_ALIGN_ORDER, 0); | |
1588 | if (!mbox->cmpl_pool) { | |
1589 | ret = -ENOMEM; | |
64d0da51 | 1590 | goto fail_destroy_bd_pool; |
dbc049ee AP |
1591 | } |
1592 | ||
1593 | /* Allocate platform MSIs for each ring */ | |
1594 | ret = platform_msi_domain_alloc_irqs(dev, mbox->num_rings, | |
1595 | flexrm_mbox_msi_write); | |
1596 | if (ret) | |
1597 | goto fail_destroy_cmpl_pool; | |
1598 | ||
1599 | /* Save alloced IRQ numbers for each ring */ | |
d722e9a5 TG |
1600 | for (index = 0; index < mbox->num_rings; index++) |
1601 | mbox->rings[index].irq = msi_get_virq(dev, index); | |
dbc049ee | 1602 | |
acf7e50a AP |
1603 | /* Check availability of debugfs */ |
1604 | if (!debugfs_initialized()) | |
1605 | goto skip_debugfs; | |
1606 | ||
1607 | /* Create debugfs root entry */ | |
1608 | mbox->root = debugfs_create_dir(dev_name(mbox->dev), NULL); | |
acf7e50a AP |
1609 | |
1610 | /* Create debugfs config entry */ | |
a9a9da47 GKH |
1611 | debugfs_create_devm_seqfile(mbox->dev, "config", mbox->root, |
1612 | flexrm_debugfs_conf_show); | |
acf7e50a AP |
1613 | |
1614 | /* Create debugfs stats entry */ | |
a9a9da47 GKH |
1615 | debugfs_create_devm_seqfile(mbox->dev, "stats", mbox->root, |
1616 | flexrm_debugfs_stats_show); | |
1617 | ||
acf7e50a AP |
1618 | skip_debugfs: |
1619 | ||
dbc049ee AP |
1620 | /* Initialize mailbox controller */ |
1621 | mbox->controller.txdone_irq = false; | |
1da92afb | 1622 | mbox->controller.txdone_poll = false; |
dbc049ee AP |
1623 | mbox->controller.ops = &flexrm_mbox_chan_ops; |
1624 | mbox->controller.dev = dev; | |
1625 | mbox->controller.num_chans = mbox->num_rings; | |
1626 | mbox->controller.of_xlate = flexrm_mbox_of_xlate; | |
1627 | mbox->controller.chans = devm_kcalloc(dev, mbox->num_rings, | |
1628 | sizeof(*mbox->controller.chans), GFP_KERNEL); | |
1629 | if (!mbox->controller.chans) { | |
1630 | ret = -ENOMEM; | |
acf7e50a | 1631 | goto fail_free_debugfs_root; |
dbc049ee AP |
1632 | } |
1633 | for (index = 0; index < mbox->num_rings; index++) | |
1634 | mbox->controller.chans[index].con_priv = &mbox->rings[index]; | |
1635 | ||
1636 | /* Register mailbox controller */ | |
0cafc12a | 1637 | ret = devm_mbox_controller_register(dev, &mbox->controller); |
dbc049ee | 1638 | if (ret) |
acf7e50a | 1639 | goto fail_free_debugfs_root; |
dbc049ee AP |
1640 | |
1641 | dev_info(dev, "registered flexrm mailbox with %d channels\n", | |
1642 | mbox->controller.num_chans); | |
1643 | ||
1644 | return 0; | |
1645 | ||
acf7e50a AP |
1646 | fail_free_debugfs_root: |
1647 | debugfs_remove_recursive(mbox->root); | |
dbc049ee AP |
1648 | platform_msi_domain_free_irqs(dev); |
1649 | fail_destroy_cmpl_pool: | |
1650 | dma_pool_destroy(mbox->cmpl_pool); | |
64d0da51 | 1651 | fail_destroy_bd_pool: |
dbc049ee AP |
1652 | dma_pool_destroy(mbox->bd_pool); |
1653 | fail: | |
1654 | return ret; | |
1655 | } | |
1656 | ||
1657 | static int flexrm_mbox_remove(struct platform_device *pdev) | |
1658 | { | |
dbc049ee | 1659 | struct device *dev = &pdev->dev; |
dbc049ee AP |
1660 | struct flexrm_mbox *mbox = platform_get_drvdata(pdev); |
1661 | ||
acf7e50a AP |
1662 | debugfs_remove_recursive(mbox->root); |
1663 | ||
dbc049ee AP |
1664 | platform_msi_domain_free_irqs(dev); |
1665 | ||
1666 | dma_pool_destroy(mbox->cmpl_pool); | |
1667 | dma_pool_destroy(mbox->bd_pool); | |
1668 | ||
dbc049ee AP |
1669 | return 0; |
1670 | } | |
1671 | ||
1672 | static const struct of_device_id flexrm_mbox_of_match[] = { | |
1673 | { .compatible = "brcm,iproc-flexrm-mbox", }, | |
1674 | {}, | |
1675 | }; | |
1676 | MODULE_DEVICE_TABLE(of, flexrm_mbox_of_match); | |
1677 | ||
1678 | static struct platform_driver flexrm_mbox_driver = { | |
1679 | .driver = { | |
1680 | .name = "brcm-flexrm-mbox", | |
1681 | .of_match_table = flexrm_mbox_of_match, | |
1682 | }, | |
1683 | .probe = flexrm_mbox_probe, | |
1684 | .remove = flexrm_mbox_remove, | |
1685 | }; | |
1686 | module_platform_driver(flexrm_mbox_driver); | |
1687 | ||
1688 | MODULE_AUTHOR("Anup Patel <anup.patel@broadcom.com>"); | |
1689 | MODULE_DESCRIPTION("Broadcom FlexRM mailbox driver"); | |
1690 | MODULE_LICENSE("GPL v2"); |