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aspeed/smc: handle dummy bytes when doing fast reads in command mode
[qemu.git] / hw / ssi / aspeed_smc.c
blob087b29e8da1020f9d61619f5a0fac1650124b913
1 /*
2 * ASPEED AST2400 SMC Controller (SPI Flash Only)
3 *
4 * Copyright (C) 2016 IBM Corp.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25 #include "qemu/osdep.h"
26 #include "hw/sysbus.h"
27 #include "sysemu/sysemu.h"
28 #include "qemu/log.h"
29 #include "include/qemu/error-report.h"
30 #include "exec/address-spaces.h"
31
32 #include "hw/ssi/aspeed_smc.h"
33
34 /* CE Type Setting Register */
35 #define R_CONF (0x00 / 4)
36 #define CONF_LEGACY_DISABLE (1 << 31)
37 #define CONF_ENABLE_W4 20
38 #define CONF_ENABLE_W3 19
39 #define CONF_ENABLE_W2 18
40 #define CONF_ENABLE_W1 17
41 #define CONF_ENABLE_W0 16
42 #define CONF_FLASH_TYPE4 8
43 #define CONF_FLASH_TYPE3 6
44 #define CONF_FLASH_TYPE2 4
45 #define CONF_FLASH_TYPE1 2
46 #define CONF_FLASH_TYPE0 0
47 #define CONF_FLASH_TYPE_NOR 0x0
48 #define CONF_FLASH_TYPE_NAND 0x1
49 #define CONF_FLASH_TYPE_SPI 0x2
50
51 /* CE Control Register */
52 #define R_CE_CTRL (0x04 / 4)
53 #define CTRL_EXTENDED4 4 /* 32 bit addressing for SPI */
54 #define CTRL_EXTENDED3 3 /* 32 bit addressing for SPI */
55 #define CTRL_EXTENDED2 2 /* 32 bit addressing for SPI */
56 #define CTRL_EXTENDED1 1 /* 32 bit addressing for SPI */
57 #define CTRL_EXTENDED0 0 /* 32 bit addressing for SPI */
58
59 /* Interrupt Control and Status Register */
60 #define R_INTR_CTRL (0x08 / 4)
61 #define INTR_CTRL_DMA_STATUS (1 << 11)
62 #define INTR_CTRL_CMD_ABORT_STATUS (1 << 10)
63 #define INTR_CTRL_WRITE_PROTECT_STATUS (1 << 9)
64 #define INTR_CTRL_DMA_EN (1 << 3)
65 #define INTR_CTRL_CMD_ABORT_EN (1 << 2)
66 #define INTR_CTRL_WRITE_PROTECT_EN (1 << 1)
67
68 /* CEx Control Register */
69 #define R_CTRL0 (0x10 / 4)
70 #define CTRL_CMD_SHIFT 16
71 #define CTRL_CMD_MASK 0xff
72 #define CTRL_DUMMY_HIGH_SHIFT 14
73 #define CTRL_AST2400_SPI_4BYTE (1 << 13)
74 #define CTRL_DUMMY_LOW_SHIFT 6 /* 2 bits [7:6] */
75 #define CTRL_CE_STOP_ACTIVE (1 << 2)
76 #define CTRL_CMD_MODE_MASK 0x3
77 #define CTRL_READMODE 0x0
78 #define CTRL_FREADMODE 0x1
79 #define CTRL_WRITEMODE 0x2
80 #define CTRL_USERMODE 0x3
81 #define R_CTRL1 (0x14 / 4)
82 #define R_CTRL2 (0x18 / 4)
83 #define R_CTRL3 (0x1C / 4)
84 #define R_CTRL4 (0x20 / 4)
85
86 /* CEx Segment Address Register */
87 #define R_SEG_ADDR0 (0x30 / 4)
88 #define SEG_END_SHIFT 24 /* 8MB units */
89 #define SEG_END_MASK 0xff
90 #define SEG_START_SHIFT 16 /* address bit [A29-A23] */
91 #define SEG_START_MASK 0xff
92 #define R_SEG_ADDR1 (0x34 / 4)
93 #define R_SEG_ADDR2 (0x38 / 4)
94 #define R_SEG_ADDR3 (0x3C / 4)
95 #define R_SEG_ADDR4 (0x40 / 4)
96
97 /* Misc Control Register #1 */
98 #define R_MISC_CTRL1 (0x50 / 4)
99
100 /* Misc Control Register #2 */
101 #define R_MISC_CTRL2 (0x54 / 4)
102
103 /* DMA Control/Status Register */
104 #define R_DMA_CTRL (0x80 / 4)
105 #define DMA_CTRL_DELAY_MASK 0xf
106 #define DMA_CTRL_DELAY_SHIFT 8
107 #define DMA_CTRL_FREQ_MASK 0xf
108 #define DMA_CTRL_FREQ_SHIFT 4
109 #define DMA_CTRL_MODE (1 << 3)
110 #define DMA_CTRL_CKSUM (1 << 2)
111 #define DMA_CTRL_DIR (1 << 1)
112 #define DMA_CTRL_EN (1 << 0)
113
114 /* DMA Flash Side Address */
115 #define R_DMA_FLASH_ADDR (0x84 / 4)
116
117 /* DMA DRAM Side Address */
118 #define R_DMA_DRAM_ADDR (0x88 / 4)
119
120 /* DMA Length Register */
121 #define R_DMA_LEN (0x8C / 4)
122
123 /* Checksum Calculation Result */
124 #define R_DMA_CHECKSUM (0x90 / 4)
125
126 /* Misc Control Register #2 */
127 #define R_TIMINGS (0x94 / 4)
128
129 /* SPI controller registers and bits */
130 #define R_SPI_CONF (0x00 / 4)
131 #define SPI_CONF_ENABLE_W0 0
132 #define R_SPI_CTRL0 (0x4 / 4)
133 #define R_SPI_MISC_CTRL (0x10 / 4)
134 #define R_SPI_TIMINGS (0x14 / 4)
135
136 #define ASPEED_SMC_R_SPI_MAX (0x20 / 4)
137 #define ASPEED_SMC_R_SMC_MAX (0x20 / 4)
138
139 #define ASPEED_SOC_SMC_FLASH_BASE 0x10000000
140 #define ASPEED_SOC_FMC_FLASH_BASE 0x20000000
141 #define ASPEED_SOC_SPI_FLASH_BASE 0x30000000
142 #define ASPEED_SOC_SPI2_FLASH_BASE 0x38000000
143
144 /* Flash opcodes. */
145 #define SPI_OP_READ 0x03 /* Read data bytes (low frequency) */
146
147 /*
148 * Default segments mapping addresses and size for each slave per
149 * controller. These can be changed when board is initialized with the
150 * Segment Address Registers.
151 */
152 static const AspeedSegments aspeed_segments_legacy[] = {
153 { 0x10000000, 32 * 1024 * 1024 },
154 };
155
156 static const AspeedSegments aspeed_segments_fmc[] = {
157 { 0x20000000, 64 * 1024 * 1024 }, /* start address is readonly */
158 { 0x24000000, 32 * 1024 * 1024 },
159 { 0x26000000, 32 * 1024 * 1024 },
160 { 0x28000000, 32 * 1024 * 1024 },
161 { 0x2A000000, 32 * 1024 * 1024 }
162 };
163
164 static const AspeedSegments aspeed_segments_spi[] = {
165 { 0x30000000, 64 * 1024 * 1024 },
166 };
167
168 static const AspeedSegments aspeed_segments_ast2500_fmc[] = {
169 { 0x20000000, 128 * 1024 * 1024 }, /* start address is readonly */
170 { 0x28000000, 32 * 1024 * 1024 },
171 { 0x2A000000, 32 * 1024 * 1024 },
172 };
173
174 static const AspeedSegments aspeed_segments_ast2500_spi1[] = {
175 { 0x30000000, 32 * 1024 * 1024 }, /* start address is readonly */
176 { 0x32000000, 96 * 1024 * 1024 }, /* end address is readonly */
177 };
178
179 static const AspeedSegments aspeed_segments_ast2500_spi2[] = {
180 { 0x38000000, 32 * 1024 * 1024 }, /* start address is readonly */
181 { 0x3A000000, 96 * 1024 * 1024 }, /* end address is readonly */
182 };
183
184 static const AspeedSMCController controllers[] = {
185 {
186 .name = "aspeed.smc.smc",
187 .r_conf = R_CONF,
188 .r_ce_ctrl = R_CE_CTRL,
189 .r_ctrl0 = R_CTRL0,
190 .r_timings = R_TIMINGS,
191 .conf_enable_w0 = CONF_ENABLE_W0,
192 .max_slaves = 5,
193 .segments = aspeed_segments_legacy,
194 .flash_window_base = ASPEED_SOC_SMC_FLASH_BASE,
195 .flash_window_size = 0x6000000,
196 .has_dma = false,
197 .nregs = ASPEED_SMC_R_SMC_MAX,
198 }, {
199 .name = "aspeed.smc.fmc",
200 .r_conf = R_CONF,
201 .r_ce_ctrl = R_CE_CTRL,
202 .r_ctrl0 = R_CTRL0,
203 .r_timings = R_TIMINGS,
204 .conf_enable_w0 = CONF_ENABLE_W0,
205 .max_slaves = 5,
206 .segments = aspeed_segments_fmc,
207 .flash_window_base = ASPEED_SOC_FMC_FLASH_BASE,
208 .flash_window_size = 0x10000000,
209 .has_dma = true,
210 .nregs = ASPEED_SMC_R_MAX,
211 }, {
212 .name = "aspeed.smc.spi",
213 .r_conf = R_SPI_CONF,
214 .r_ce_ctrl = 0xff,
215 .r_ctrl0 = R_SPI_CTRL0,
216 .r_timings = R_SPI_TIMINGS,
217 .conf_enable_w0 = SPI_CONF_ENABLE_W0,
218 .max_slaves = 1,
219 .segments = aspeed_segments_spi,
220 .flash_window_base = ASPEED_SOC_SPI_FLASH_BASE,
221 .flash_window_size = 0x10000000,
222 .has_dma = false,
223 .nregs = ASPEED_SMC_R_SPI_MAX,
224 }, {
225 .name = "aspeed.smc.ast2500-fmc",
226 .r_conf = R_CONF,
227 .r_ce_ctrl = R_CE_CTRL,
228 .r_ctrl0 = R_CTRL0,
229 .r_timings = R_TIMINGS,
230 .conf_enable_w0 = CONF_ENABLE_W0,
231 .max_slaves = 3,
232 .segments = aspeed_segments_ast2500_fmc,
233 .flash_window_base = ASPEED_SOC_FMC_FLASH_BASE,
234 .flash_window_size = 0x10000000,
235 .has_dma = true,
236 .nregs = ASPEED_SMC_R_MAX,
237 }, {
238 .name = "aspeed.smc.ast2500-spi1",
239 .r_conf = R_CONF,
240 .r_ce_ctrl = R_CE_CTRL,
241 .r_ctrl0 = R_CTRL0,
242 .r_timings = R_TIMINGS,
243 .conf_enable_w0 = CONF_ENABLE_W0,
244 .max_slaves = 2,
245 .segments = aspeed_segments_ast2500_spi1,
246 .flash_window_base = ASPEED_SOC_SPI_FLASH_BASE,
247 .flash_window_size = 0x8000000,
248 .has_dma = false,
249 .nregs = ASPEED_SMC_R_MAX,
250 }, {
251 .name = "aspeed.smc.ast2500-spi2",
252 .r_conf = R_CONF,
253 .r_ce_ctrl = R_CE_CTRL,
254 .r_ctrl0 = R_CTRL0,
255 .r_timings = R_TIMINGS,
256 .conf_enable_w0 = CONF_ENABLE_W0,
257 .max_slaves = 2,
258 .segments = aspeed_segments_ast2500_spi2,
259 .flash_window_base = ASPEED_SOC_SPI2_FLASH_BASE,
260 .flash_window_size = 0x8000000,
261 .has_dma = false,
262 .nregs = ASPEED_SMC_R_MAX,
263 },
264 };
265
266 /*
267 * The Segment Register uses a 8MB unit to encode the start address
268 * and the end address of the mapping window of a flash SPI slave :
269 *
270 * | byte 1 | byte 2 | byte 3 | byte 4 |
271 * +--------+--------+--------+--------+
272 * | end | start | 0 | 0 |
273 *
274 */
275 static inline uint32_t aspeed_smc_segment_to_reg(const AspeedSegments *seg)
276 {
277 uint32_t reg = 0;
278 reg |= ((seg->addr >> 23) & SEG_START_MASK) << SEG_START_SHIFT;
279 reg |= (((seg->addr + seg->size) >> 23) & SEG_END_MASK) << SEG_END_SHIFT;
280 return reg;
281 }
282
283 static inline void aspeed_smc_reg_to_segment(uint32_t reg, AspeedSegments *seg)
284 {
285 seg->addr = ((reg >> SEG_START_SHIFT) & SEG_START_MASK) << 23;
286 seg->size = (((reg >> SEG_END_SHIFT) & SEG_END_MASK) << 23) - seg->addr;
287 }
288
289 static bool aspeed_smc_flash_overlap(const AspeedSMCState *s,
290 const AspeedSegments *new,
291 int cs)
292 {
293 AspeedSegments seg;
294 int i;
295
296 for (i = 0; i < s->ctrl->max_slaves; i++) {
297 if (i == cs) {
298 continue;
299 }
300
301 aspeed_smc_reg_to_segment(s->regs[R_SEG_ADDR0 + i], &seg);
302
303 if (new->addr + new->size > seg.addr &&
304 new->addr < seg.addr + seg.size) {
305 qemu_log_mask(LOG_GUEST_ERROR, "%s: new segment CS%d [ 0x%"
306 HWADDR_PRIx" - 0x%"HWADDR_PRIx" ] overlaps with "
307 "CS%d [ 0x%"HWADDR_PRIx" - 0x%"HWADDR_PRIx" ]\n",
308 s->ctrl->name, cs, new->addr, new->addr + new->size,
309 i, seg.addr, seg.addr + seg.size);
310 return true;
311 }
312 }
313 return false;
314 }
315
316 static void aspeed_smc_flash_set_segment(AspeedSMCState *s, int cs,
317 uint64_t new)
318 {
319 AspeedSMCFlash *fl = &s->flashes[cs];
320 AspeedSegments seg;
321
322 aspeed_smc_reg_to_segment(new, &seg);
323
324 /* The start address of CS0 is read-only */
325 if (cs == 0 && seg.addr != s->ctrl->flash_window_base) {
326 qemu_log_mask(LOG_GUEST_ERROR,
327 "%s: Tried to change CS0 start address to 0x%"
328 HWADDR_PRIx "\n", s->ctrl->name, seg.addr);
329 seg.addr = s->ctrl->flash_window_base;
330 new = aspeed_smc_segment_to_reg(&seg);
331 }
332
333 /*
334 * The end address of the AST2500 spi controllers is also
335 * read-only.
336 */
337 if ((s->ctrl->segments == aspeed_segments_ast2500_spi1 ||
338 s->ctrl->segments == aspeed_segments_ast2500_spi2) &&
339 cs == s->ctrl->max_slaves &&
340 seg.addr + seg.size != s->ctrl->segments[cs].addr +
341 s->ctrl->segments[cs].size) {
342 qemu_log_mask(LOG_GUEST_ERROR,
343 "%s: Tried to change CS%d end address to 0x%"
344 HWADDR_PRIx "\n", s->ctrl->name, cs, seg.addr + seg.size);
345 seg.size = s->ctrl->segments[cs].addr + s->ctrl->segments[cs].size -
346 seg.addr;
347 new = aspeed_smc_segment_to_reg(&seg);
348 }
349
350 /* Keep the segment in the overall flash window */
351 if (seg.addr + seg.size <= s->ctrl->flash_window_base ||
352 seg.addr > s->ctrl->flash_window_base + s->ctrl->flash_window_size) {
353 qemu_log_mask(LOG_GUEST_ERROR, "%s: new segment for CS%d is invalid : "
354 "[ 0x%"HWADDR_PRIx" - 0x%"HWADDR_PRIx" ]\n",
355 s->ctrl->name, cs, seg.addr, seg.addr + seg.size);
356 return;
357 }
358
359 /* Check start address vs. alignment */
360 if (seg.size && !QEMU_IS_ALIGNED(seg.addr, seg.size)) {
361 qemu_log_mask(LOG_GUEST_ERROR, "%s: new segment for CS%d is not "
362 "aligned : [ 0x%"HWADDR_PRIx" - 0x%"HWADDR_PRIx" ]\n",
363 s->ctrl->name, cs, seg.addr, seg.addr + seg.size);
364 }
365
366 /* And segments should not overlap (in the specs) */
367 aspeed_smc_flash_overlap(s, &seg, cs);
368
369 /* All should be fine now to move the region */
370 memory_region_transaction_begin();
371 memory_region_set_size(&fl->mmio, seg.size);
372 memory_region_set_address(&fl->mmio, seg.addr - s->ctrl->flash_window_base);
373 memory_region_set_enabled(&fl->mmio, true);
374 memory_region_transaction_commit();
375
376 s->regs[R_SEG_ADDR0 + cs] = new;
377 }
378
379 static uint64_t aspeed_smc_flash_default_read(void *opaque, hwaddr addr,
380 unsigned size)
381 {
382 qemu_log_mask(LOG_GUEST_ERROR, "%s: To 0x%" HWADDR_PRIx " of size %u"
383 PRIx64 "\n", __func__, addr, size);
384 return 0;
385 }
386
387 static void aspeed_smc_flash_default_write(void *opaque, hwaddr addr,
388 uint64_t data, unsigned size)
389 {
390 qemu_log_mask(LOG_GUEST_ERROR, "%s: To 0x%" HWADDR_PRIx " of size %u: 0x%"
391 PRIx64 "\n", __func__, addr, size, data);
392 }
393
394 static const MemoryRegionOps aspeed_smc_flash_default_ops = {
395 .read = aspeed_smc_flash_default_read,
396 .write = aspeed_smc_flash_default_write,
397 .endianness = DEVICE_LITTLE_ENDIAN,
398 .valid = {
399 .min_access_size = 1,
400 .max_access_size = 4,
401 },
402 };
403
404 static inline int aspeed_smc_flash_mode(const AspeedSMCFlash *fl)
405 {
406 const AspeedSMCState *s = fl->controller;
407
408 return s->regs[s->r_ctrl0 + fl->id] & CTRL_CMD_MODE_MASK;
409 }
410
411 static inline bool aspeed_smc_is_writable(const AspeedSMCFlash *fl)
412 {
413 const AspeedSMCState *s = fl->controller;
414
415 return s->regs[s->r_conf] & (1 << (s->conf_enable_w0 + fl->id));
416 }
417
418 static inline int aspeed_smc_flash_cmd(const AspeedSMCFlash *fl)
419 {
420 const AspeedSMCState *s = fl->controller;
421 int cmd = (s->regs[s->r_ctrl0 + fl->id] >> CTRL_CMD_SHIFT) & CTRL_CMD_MASK;
422
423 /* In read mode, the default SPI command is READ (0x3). In other
424 * modes, the command should necessarily be defined */
425 if (aspeed_smc_flash_mode(fl) == CTRL_READMODE) {
426 cmd = SPI_OP_READ;
427 }
428
429 if (!cmd) {
430 qemu_log_mask(LOG_GUEST_ERROR, "%s: no command defined for mode %d\n",
431 __func__, aspeed_smc_flash_mode(fl));
432 }
433
434 return cmd;
435 }
436
437 static inline int aspeed_smc_flash_is_4byte(const AspeedSMCFlash *fl)
438 {
439 const AspeedSMCState *s = fl->controller;
440
441 if (s->ctrl->segments == aspeed_segments_spi) {
442 return s->regs[s->r_ctrl0] & CTRL_AST2400_SPI_4BYTE;
443 } else {
444 return s->regs[s->r_ce_ctrl] & (1 << (CTRL_EXTENDED0 + fl->id));
445 }
446 }
447
448 static inline bool aspeed_smc_is_ce_stop_active(const AspeedSMCFlash *fl)
449 {
450 const AspeedSMCState *s = fl->controller;
451
452 return s->regs[s->r_ctrl0 + fl->id] & CTRL_CE_STOP_ACTIVE;
453 }
454
455 static void aspeed_smc_flash_select(AspeedSMCFlash *fl)
456 {
457 AspeedSMCState *s = fl->controller;
458
459 s->regs[s->r_ctrl0 + fl->id] &= ~CTRL_CE_STOP_ACTIVE;
460 qemu_set_irq(s->cs_lines[fl->id], aspeed_smc_is_ce_stop_active(fl));
461 }
462
463 static void aspeed_smc_flash_unselect(AspeedSMCFlash *fl)
464 {
465 AspeedSMCState *s = fl->controller;
466
467 s->regs[s->r_ctrl0 + fl->id] |= CTRL_CE_STOP_ACTIVE;
468 qemu_set_irq(s->cs_lines[fl->id], aspeed_smc_is_ce_stop_active(fl));
469 }
470
471 static uint32_t aspeed_smc_check_segment_addr(const AspeedSMCFlash *fl,
472 uint32_t addr)
473 {
474 const AspeedSMCState *s = fl->controller;
475 AspeedSegments seg;
476
477 aspeed_smc_reg_to_segment(s->regs[R_SEG_ADDR0 + fl->id], &seg);
478 if ((addr & (seg.size - 1)) != addr) {
479 qemu_log_mask(LOG_GUEST_ERROR,
480 "%s: invalid address 0x%08x for CS%d segment : "
481 "[ 0x%"HWADDR_PRIx" - 0x%"HWADDR_PRIx" ]\n",
482 s->ctrl->name, addr, fl->id, seg.addr,
483 seg.addr + seg.size);
484 }
485
486 addr &= seg.size - 1;
487 return addr;
488 }
489
490 static int aspeed_smc_flash_dummies(const AspeedSMCFlash *fl)
491 {
492 const AspeedSMCState *s = fl->controller;
493 uint32_t r_ctrl0 = s->regs[s->r_ctrl0 + fl->id];
494 uint32_t dummy_high = (r_ctrl0 >> CTRL_DUMMY_HIGH_SHIFT) & 0x1;
495 uint32_t dummy_low = (r_ctrl0 >> CTRL_DUMMY_LOW_SHIFT) & 0x3;
496
497 return ((dummy_high << 2) | dummy_low) * 8;
498 }
499
500 static void aspeed_smc_flash_send_addr(AspeedSMCFlash *fl, uint32_t addr)
501 {
502 const AspeedSMCState *s = fl->controller;
503 uint8_t cmd = aspeed_smc_flash_cmd(fl);
504
505 /* Flash access can not exceed CS segment */
506 addr = aspeed_smc_check_segment_addr(fl, addr);
507
508 ssi_transfer(s->spi, cmd);
509
510 if (aspeed_smc_flash_is_4byte(fl)) {
511 ssi_transfer(s->spi, (addr >> 24) & 0xff);
512 }
513 ssi_transfer(s->spi, (addr >> 16) & 0xff);
514 ssi_transfer(s->spi, (addr >> 8) & 0xff);
515 ssi_transfer(s->spi, (addr & 0xff));
516 }
517
518 static uint64_t aspeed_smc_flash_read(void *opaque, hwaddr addr, unsigned size)
519 {
520 AspeedSMCFlash *fl = opaque;
521 AspeedSMCState *s = fl->controller;
522 uint64_t ret = 0;
523 int i;
524
525 switch (aspeed_smc_flash_mode(fl)) {
526 case CTRL_USERMODE:
527 for (i = 0; i < size; i++) {
528 ret |= ssi_transfer(s->spi, 0x0) << (8 * i);
529 }
530 break;
531 case CTRL_READMODE:
532 case CTRL_FREADMODE:
533 aspeed_smc_flash_select(fl);
534 aspeed_smc_flash_send_addr(fl, addr);
535
536 /*
537 * Use fake transfers to model dummy bytes. The value should
538 * be configured to some non-zero value in fast read mode and
539 * zero in read mode.
540 */
541 for (i = 0; i < aspeed_smc_flash_dummies(fl); i++) {
542 ssi_transfer(fl->controller->spi, 0xFF);
543 }
544
545 for (i = 0; i < size; i++) {
546 ret |= ssi_transfer(s->spi, 0x0) << (8 * i);
547 }
548
549 aspeed_smc_flash_unselect(fl);
550 break;
551 default:
552 qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid flash mode %d\n",
553 __func__, aspeed_smc_flash_mode(fl));
554 }
555
556 return ret;
557 }
558
559 static void aspeed_smc_flash_write(void *opaque, hwaddr addr, uint64_t data,
560 unsigned size)
561 {
562 AspeedSMCFlash *fl = opaque;
563 AspeedSMCState *s = fl->controller;
564 int i;
565
566 if (!aspeed_smc_is_writable(fl)) {
567 qemu_log_mask(LOG_GUEST_ERROR, "%s: flash is not writable at 0x%"
568 HWADDR_PRIx "\n", __func__, addr);
569 return;
570 }
571
572 switch (aspeed_smc_flash_mode(fl)) {
573 case CTRL_USERMODE:
574 for (i = 0; i < size; i++) {
575 ssi_transfer(s->spi, (data >> (8 * i)) & 0xff);
576 }
577 break;
578 case CTRL_WRITEMODE:
579 aspeed_smc_flash_select(fl);
580 aspeed_smc_flash_send_addr(fl, addr);
581
582 for (i = 0; i < size; i++) {
583 ssi_transfer(s->spi, (data >> (8 * i)) & 0xff);
584 }
585
586 aspeed_smc_flash_unselect(fl);
587 break;
588 default:
589 qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid flash mode %d\n",
590 __func__, aspeed_smc_flash_mode(fl));
591 }
592 }
593
594 static const MemoryRegionOps aspeed_smc_flash_ops = {
595 .read = aspeed_smc_flash_read,
596 .write = aspeed_smc_flash_write,
597 .endianness = DEVICE_LITTLE_ENDIAN,
598 .valid = {
599 .min_access_size = 1,
600 .max_access_size = 4,
601 },
602 };
603
604 static void aspeed_smc_flash_update_cs(AspeedSMCFlash *fl)
605 {
606 const AspeedSMCState *s = fl->controller;
607
608 qemu_set_irq(s->cs_lines[fl->id], aspeed_smc_is_ce_stop_active(fl));
609 }
610
611 static void aspeed_smc_reset(DeviceState *d)
612 {
613 AspeedSMCState *s = ASPEED_SMC(d);
614 int i;
615
616 memset(s->regs, 0, sizeof s->regs);
617
618 /* Pretend DMA is done (u-boot initialization) */
619 s->regs[R_INTR_CTRL] = INTR_CTRL_DMA_STATUS;
620
621 /* Unselect all slaves */
622 for (i = 0; i < s->num_cs; ++i) {
623 s->regs[s->r_ctrl0 + i] |= CTRL_CE_STOP_ACTIVE;
624 qemu_set_irq(s->cs_lines[i], true);
625 }
626
627 /* setup default segment register values for all */
628 for (i = 0; i < s->ctrl->max_slaves; ++i) {
629 s->regs[R_SEG_ADDR0 + i] =
630 aspeed_smc_segment_to_reg(&s->ctrl->segments[i]);
631 }
632
633 /* HW strapping for AST2500 FMC controllers */
634 if (s->ctrl->segments == aspeed_segments_ast2500_fmc) {
635 /* flash type is fixed to SPI for CE0 and CE1 */
636 s->regs[s->r_conf] |= (CONF_FLASH_TYPE_SPI << CONF_FLASH_TYPE0);
637 s->regs[s->r_conf] |= (CONF_FLASH_TYPE_SPI << CONF_FLASH_TYPE1);
638
639 /* 4BYTE mode is autodetected for CE0. Let's force it to 1 for
640 * now */
641 s->regs[s->r_ce_ctrl] |= (1 << (CTRL_EXTENDED0));
642 }
643
644 /* HW strapping for AST2400 FMC controllers (SCU70). Let's use the
645 * configuration of the palmetto-bmc machine */
646 if (s->ctrl->segments == aspeed_segments_fmc) {
647 s->regs[s->r_conf] |= (CONF_FLASH_TYPE_SPI << CONF_FLASH_TYPE0);
648
649 s->regs[s->r_ce_ctrl] |= (1 << (CTRL_EXTENDED0));
650 }
651 }
652
653 static uint64_t aspeed_smc_read(void *opaque, hwaddr addr, unsigned int size)
654 {
655 AspeedSMCState *s = ASPEED_SMC(opaque);
656
657 addr >>= 2;
658
659 if (addr == s->r_conf ||
660 addr == s->r_timings ||
661 addr == s->r_ce_ctrl ||
662 addr == R_INTR_CTRL ||
663 (addr >= R_SEG_ADDR0 && addr < R_SEG_ADDR0 + s->ctrl->max_slaves) ||
664 (addr >= s->r_ctrl0 && addr < s->r_ctrl0 + s->num_cs)) {
665 return s->regs[addr];
666 } else {
667 qemu_log_mask(LOG_UNIMP, "%s: not implemented: 0x%" HWADDR_PRIx "\n",
668 __func__, addr);
669 return 0;
670 }
671 }
672
673 static void aspeed_smc_write(void *opaque, hwaddr addr, uint64_t data,
674 unsigned int size)
675 {
676 AspeedSMCState *s = ASPEED_SMC(opaque);
677 uint32_t value = data;
678
679 addr >>= 2;
680
681 if (addr == s->r_conf ||
682 addr == s->r_timings ||
683 addr == s->r_ce_ctrl) {
684 s->regs[addr] = value;
685 } else if (addr >= s->r_ctrl0 && addr < s->r_ctrl0 + s->num_cs) {
686 int cs = addr - s->r_ctrl0;
687 s->regs[addr] = value;
688 aspeed_smc_flash_update_cs(&s->flashes[cs]);
689 } else if (addr >= R_SEG_ADDR0 &&
690 addr < R_SEG_ADDR0 + s->ctrl->max_slaves) {
691 int cs = addr - R_SEG_ADDR0;
692
693 if (value != s->regs[R_SEG_ADDR0 + cs]) {
694 aspeed_smc_flash_set_segment(s, cs, value);
695 }
696 } else {
697 qemu_log_mask(LOG_UNIMP, "%s: not implemented: 0x%" HWADDR_PRIx "\n",
698 __func__, addr);
699 return;
700 }
701 }
702
703 static const MemoryRegionOps aspeed_smc_ops = {
704 .read = aspeed_smc_read,
705 .write = aspeed_smc_write,
706 .endianness = DEVICE_LITTLE_ENDIAN,
707 .valid.unaligned = true,
708 };
709
710 static void aspeed_smc_realize(DeviceState *dev, Error **errp)
711 {
712 SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
713 AspeedSMCState *s = ASPEED_SMC(dev);
714 AspeedSMCClass *mc = ASPEED_SMC_GET_CLASS(s);
715 int i;
716 char name[32];
717 hwaddr offset = 0;
718
719 s->ctrl = mc->ctrl;
720
721 /* keep a copy under AspeedSMCState to speed up accesses */
722 s->r_conf = s->ctrl->r_conf;
723 s->r_ce_ctrl = s->ctrl->r_ce_ctrl;
724 s->r_ctrl0 = s->ctrl->r_ctrl0;
725 s->r_timings = s->ctrl->r_timings;
726 s->conf_enable_w0 = s->ctrl->conf_enable_w0;
727
728 /* Enforce some real HW limits */
729 if (s->num_cs > s->ctrl->max_slaves) {
730 qemu_log_mask(LOG_GUEST_ERROR, "%s: num_cs cannot exceed: %d\n",
731 __func__, s->ctrl->max_slaves);
732 s->num_cs = s->ctrl->max_slaves;
733 }
734
735 s->spi = ssi_create_bus(dev, "spi");
736
737 /* Setup cs_lines for slaves */
738 sysbus_init_irq(sbd, &s->irq);
739 s->cs_lines = g_new0(qemu_irq, s->num_cs);
740 ssi_auto_connect_slaves(dev, s->cs_lines, s->spi);
741
742 for (i = 0; i < s->num_cs; ++i) {
743 sysbus_init_irq(sbd, &s->cs_lines[i]);
744 }
745
746 /* The memory region for the controller registers */
747 memory_region_init_io(&s->mmio, OBJECT(s), &aspeed_smc_ops, s,
748 s->ctrl->name, s->ctrl->nregs * 4);
749 sysbus_init_mmio(sbd, &s->mmio);
750
751 /*
752 * The container memory region representing the address space
753 * window in which the flash modules are mapped. The size and
754 * address depends on the SoC model and controller type.
755 */
756 snprintf(name, sizeof(name), "%s.flash", s->ctrl->name);
757
758 memory_region_init_io(&s->mmio_flash, OBJECT(s),
759 &aspeed_smc_flash_default_ops, s, name,
760 s->ctrl->flash_window_size);
761 sysbus_init_mmio(sbd, &s->mmio_flash);
762
763 s->flashes = g_new0(AspeedSMCFlash, s->ctrl->max_slaves);
764
765 /*
766 * Let's create a sub memory region for each possible slave. All
767 * have a configurable memory segment in the overall flash mapping
768 * window of the controller but, there is not necessarily a flash
769 * module behind to handle the memory accesses. This depends on
770 * the board configuration.
771 */
772 for (i = 0; i < s->ctrl->max_slaves; ++i) {
773 AspeedSMCFlash *fl = &s->flashes[i];
774
775 snprintf(name, sizeof(name), "%s.%d", s->ctrl->name, i);
776
777 fl->id = i;
778 fl->controller = s;
779 fl->size = s->ctrl->segments[i].size;
780 memory_region_init_io(&fl->mmio, OBJECT(s), &aspeed_smc_flash_ops,
781 fl, name, fl->size);
782 memory_region_add_subregion(&s->mmio_flash, offset, &fl->mmio);
783 offset += fl->size;
784 }
785 }
786
787 static const VMStateDescription vmstate_aspeed_smc = {
788 .name = "aspeed.smc",
789 .version_id = 1,
790 .minimum_version_id = 1,
791 .fields = (VMStateField[]) {
792 VMSTATE_UINT32_ARRAY(regs, AspeedSMCState, ASPEED_SMC_R_MAX),
793 VMSTATE_END_OF_LIST()
794 }
795 };
796
797 static Property aspeed_smc_properties[] = {
798 DEFINE_PROP_UINT32("num-cs", AspeedSMCState, num_cs, 1),
799 DEFINE_PROP_END_OF_LIST(),
800 };
801
802 static void aspeed_smc_class_init(ObjectClass *klass, void *data)
803 {
804 DeviceClass *dc = DEVICE_CLASS(klass);
805 AspeedSMCClass *mc = ASPEED_SMC_CLASS(klass);
806
807 dc->realize = aspeed_smc_realize;
808 dc->reset = aspeed_smc_reset;
809 dc->props = aspeed_smc_properties;
810 dc->vmsd = &vmstate_aspeed_smc;
811 mc->ctrl = data;
812 }
813
814 static const TypeInfo aspeed_smc_info = {
815 .name = TYPE_ASPEED_SMC,
816 .parent = TYPE_SYS_BUS_DEVICE,
817 .instance_size = sizeof(AspeedSMCState),
818 .class_size = sizeof(AspeedSMCClass),
819 .abstract = true,
820 };
821
822 static void aspeed_smc_register_types(void)
823 {
824 int i;
825
826 type_register_static(&aspeed_smc_info);
827 for (i = 0; i < ARRAY_SIZE(controllers); ++i) {
828 TypeInfo ti = {
829 .name = controllers[i].name,
830 .parent = TYPE_ASPEED_SMC,
831 .class_init = aspeed_smc_class_init,
832 .class_data = (void *)&controllers[i],
833 };
834 type_register(&ti);
835 }
836 }
837
838 type_init(aspeed_smc_register_types)
QEmu