xref: /qemu/hw/ssi/aspeed_smc.c (revision a57baeb45e1471f88db4a8da11a307603cfc8657)
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 "qemu/error-report.h"
30 
31 #include "hw/ssi/aspeed_smc.h"
32 
33 /* CE Type Setting Register */
34 #define R_CONF            (0x00 / 4)
35 #define   CONF_LEGACY_DISABLE  (1 << 31)
36 #define   CONF_ENABLE_W4       20
37 #define   CONF_ENABLE_W3       19
38 #define   CONF_ENABLE_W2       18
39 #define   CONF_ENABLE_W1       17
40 #define   CONF_ENABLE_W0       16
41 #define   CONF_FLASH_TYPE4     8
42 #define   CONF_FLASH_TYPE3     6
43 #define   CONF_FLASH_TYPE2     4
44 #define   CONF_FLASH_TYPE1     2
45 #define   CONF_FLASH_TYPE0     0
46 #define      CONF_FLASH_TYPE_NOR   0x0
47 #define      CONF_FLASH_TYPE_NAND  0x1
48 #define      CONF_FLASH_TYPE_SPI   0x2
49 
50 /* CE Control Register */
51 #define R_CE_CTRL            (0x04 / 4)
52 #define   CTRL_EXTENDED4       4  /* 32 bit addressing for SPI */
53 #define   CTRL_EXTENDED3       3  /* 32 bit addressing for SPI */
54 #define   CTRL_EXTENDED2       2  /* 32 bit addressing for SPI */
55 #define   CTRL_EXTENDED1       1  /* 32 bit addressing for SPI */
56 #define   CTRL_EXTENDED0       0  /* 32 bit addressing for SPI */
57 
58 /* Interrupt Control and Status Register */
59 #define R_INTR_CTRL       (0x08 / 4)
60 #define   INTR_CTRL_DMA_STATUS            (1 << 11)
61 #define   INTR_CTRL_CMD_ABORT_STATUS      (1 << 10)
62 #define   INTR_CTRL_WRITE_PROTECT_STATUS  (1 << 9)
63 #define   INTR_CTRL_DMA_EN                (1 << 3)
64 #define   INTR_CTRL_CMD_ABORT_EN          (1 << 2)
65 #define   INTR_CTRL_WRITE_PROTECT_EN      (1 << 1)
66 
67 /* CEx Control Register */
68 #define R_CTRL0           (0x10 / 4)
69 #define   CTRL_IO_DUAL_DATA        (1 << 29)
70 #define   CTRL_IO_DUAL_ADDR_DATA   (1 << 28) /* Includes dummies */
71 #define   CTRL_CMD_SHIFT           16
72 #define   CTRL_CMD_MASK            0xff
73 #define   CTRL_DUMMY_HIGH_SHIFT    14
74 #define   CTRL_AST2400_SPI_4BYTE   (1 << 13)
75 #define   CTRL_DUMMY_LOW_SHIFT     6 /* 2 bits [7:6] */
76 #define   CTRL_CE_STOP_ACTIVE      (1 << 2)
77 #define   CTRL_CMD_MODE_MASK       0x3
78 #define     CTRL_READMODE          0x0
79 #define     CTRL_FREADMODE         0x1
80 #define     CTRL_WRITEMODE         0x2
81 #define     CTRL_USERMODE          0x3
82 #define R_CTRL1           (0x14 / 4)
83 #define R_CTRL2           (0x18 / 4)
84 #define R_CTRL3           (0x1C / 4)
85 #define R_CTRL4           (0x20 / 4)
86 
87 /* CEx Segment Address Register */
88 #define R_SEG_ADDR0       (0x30 / 4)
89 #define   SEG_END_SHIFT        24   /* 8MB units */
90 #define   SEG_END_MASK         0xff
91 #define   SEG_START_SHIFT      16   /* address bit [A29-A23] */
92 #define   SEG_START_MASK       0xff
93 #define R_SEG_ADDR1       (0x34 / 4)
94 #define R_SEG_ADDR2       (0x38 / 4)
95 #define R_SEG_ADDR3       (0x3C / 4)
96 #define R_SEG_ADDR4       (0x40 / 4)
97 
98 /* Misc Control Register #1 */
99 #define R_MISC_CTRL1      (0x50 / 4)
100 
101 /* Misc Control Register #2 */
102 #define R_MISC_CTRL2      (0x54 / 4)
103 
104 /* DMA Control/Status Register */
105 #define R_DMA_CTRL        (0x80 / 4)
106 #define   DMA_CTRL_DELAY_MASK   0xf
107 #define   DMA_CTRL_DELAY_SHIFT  8
108 #define   DMA_CTRL_FREQ_MASK    0xf
109 #define   DMA_CTRL_FREQ_SHIFT   4
110 #define   DMA_CTRL_MODE         (1 << 3)
111 #define   DMA_CTRL_CKSUM        (1 << 2)
112 #define   DMA_CTRL_DIR          (1 << 1)
113 #define   DMA_CTRL_EN           (1 << 0)
114 
115 /* DMA Flash Side Address */
116 #define R_DMA_FLASH_ADDR  (0x84 / 4)
117 
118 /* DMA DRAM Side Address */
119 #define R_DMA_DRAM_ADDR   (0x88 / 4)
120 
121 /* DMA Length Register */
122 #define R_DMA_LEN         (0x8C / 4)
123 
124 /* Checksum Calculation Result */
125 #define R_DMA_CHECKSUM    (0x90 / 4)
126 
127 /* Misc Control Register #2 */
128 #define R_TIMINGS         (0x94 / 4)
129 
130 /* SPI controller registers and bits */
131 #define R_SPI_CONF        (0x00 / 4)
132 #define   SPI_CONF_ENABLE_W0   0
133 #define R_SPI_CTRL0       (0x4 / 4)
134 #define R_SPI_MISC_CTRL   (0x10 / 4)
135 #define R_SPI_TIMINGS     (0x14 / 4)
136 
137 #define ASPEED_SMC_R_SPI_MAX (0x20 / 4)
138 #define ASPEED_SMC_R_SMC_MAX (0x20 / 4)
139 
140 #define ASPEED_SOC_SMC_FLASH_BASE   0x10000000
141 #define ASPEED_SOC_FMC_FLASH_BASE   0x20000000
142 #define ASPEED_SOC_SPI_FLASH_BASE   0x30000000
143 #define ASPEED_SOC_SPI2_FLASH_BASE  0x38000000
144 
145 /* Flash opcodes. */
146 #define SPI_OP_READ       0x03    /* Read data bytes (low frequency) */
147 
148 /*
149  * Default segments mapping addresses and size for each slave per
150  * controller. These can be changed when board is initialized with the
151  * Segment Address Registers.
152  */
153 static const AspeedSegments aspeed_segments_legacy[] = {
154     { 0x10000000, 32 * 1024 * 1024 },
155 };
156 
157 static const AspeedSegments aspeed_segments_fmc[] = {
158     { 0x20000000, 64 * 1024 * 1024 }, /* start address is readonly */
159     { 0x24000000, 32 * 1024 * 1024 },
160     { 0x26000000, 32 * 1024 * 1024 },
161     { 0x28000000, 32 * 1024 * 1024 },
162     { 0x2A000000, 32 * 1024 * 1024 }
163 };
164 
165 static const AspeedSegments aspeed_segments_spi[] = {
166     { 0x30000000, 64 * 1024 * 1024 },
167 };
168 
169 static const AspeedSegments aspeed_segments_ast2500_fmc[] = {
170     { 0x20000000, 128 * 1024 * 1024 }, /* start address is readonly */
171     { 0x28000000,  32 * 1024 * 1024 },
172     { 0x2A000000,  32 * 1024 * 1024 },
173 };
174 
175 static const AspeedSegments aspeed_segments_ast2500_spi1[] = {
176     { 0x30000000, 32 * 1024 * 1024 }, /* start address is readonly */
177     { 0x32000000, 96 * 1024 * 1024 }, /* end address is readonly */
178 };
179 
180 static const AspeedSegments aspeed_segments_ast2500_spi2[] = {
181     { 0x38000000, 32 * 1024 * 1024 }, /* start address is readonly */
182     { 0x3A000000, 96 * 1024 * 1024 }, /* end address is readonly */
183 };
184 
185 static const AspeedSMCController controllers[] = {
186     {
187         .name              = "aspeed.smc.smc",
188         .r_conf            = R_CONF,
189         .r_ce_ctrl         = R_CE_CTRL,
190         .r_ctrl0           = R_CTRL0,
191         .r_timings         = R_TIMINGS,
192         .conf_enable_w0    = CONF_ENABLE_W0,
193         .max_slaves        = 5,
194         .segments          = aspeed_segments_legacy,
195         .flash_window_base = ASPEED_SOC_SMC_FLASH_BASE,
196         .flash_window_size = 0x6000000,
197         .has_dma           = false,
198         .nregs             = ASPEED_SMC_R_SMC_MAX,
199     }, {
200         .name              = "aspeed.smc.fmc",
201         .r_conf            = R_CONF,
202         .r_ce_ctrl         = R_CE_CTRL,
203         .r_ctrl0           = R_CTRL0,
204         .r_timings         = R_TIMINGS,
205         .conf_enable_w0    = CONF_ENABLE_W0,
206         .max_slaves        = 5,
207         .segments          = aspeed_segments_fmc,
208         .flash_window_base = ASPEED_SOC_FMC_FLASH_BASE,
209         .flash_window_size = 0x10000000,
210         .has_dma           = true,
211         .nregs             = ASPEED_SMC_R_MAX,
212     }, {
213         .name              = "aspeed.smc.spi",
214         .r_conf            = R_SPI_CONF,
215         .r_ce_ctrl         = 0xff,
216         .r_ctrl0           = R_SPI_CTRL0,
217         .r_timings         = R_SPI_TIMINGS,
218         .conf_enable_w0    = SPI_CONF_ENABLE_W0,
219         .max_slaves        = 1,
220         .segments          = aspeed_segments_spi,
221         .flash_window_base = ASPEED_SOC_SPI_FLASH_BASE,
222         .flash_window_size = 0x10000000,
223         .has_dma           = false,
224         .nregs             = ASPEED_SMC_R_SPI_MAX,
225     }, {
226         .name              = "aspeed.smc.ast2500-fmc",
227         .r_conf            = R_CONF,
228         .r_ce_ctrl         = R_CE_CTRL,
229         .r_ctrl0           = R_CTRL0,
230         .r_timings         = R_TIMINGS,
231         .conf_enable_w0    = CONF_ENABLE_W0,
232         .max_slaves        = 3,
233         .segments          = aspeed_segments_ast2500_fmc,
234         .flash_window_base = ASPEED_SOC_FMC_FLASH_BASE,
235         .flash_window_size = 0x10000000,
236         .has_dma           = true,
237         .nregs             = ASPEED_SMC_R_MAX,
238     }, {
239         .name              = "aspeed.smc.ast2500-spi1",
240         .r_conf            = R_CONF,
241         .r_ce_ctrl         = R_CE_CTRL,
242         .r_ctrl0           = R_CTRL0,
243         .r_timings         = R_TIMINGS,
244         .conf_enable_w0    = CONF_ENABLE_W0,
245         .max_slaves        = 2,
246         .segments          = aspeed_segments_ast2500_spi1,
247         .flash_window_base = ASPEED_SOC_SPI_FLASH_BASE,
248         .flash_window_size = 0x8000000,
249         .has_dma           = false,
250         .nregs             = ASPEED_SMC_R_MAX,
251     }, {
252         .name              = "aspeed.smc.ast2500-spi2",
253         .r_conf            = R_CONF,
254         .r_ce_ctrl         = R_CE_CTRL,
255         .r_ctrl0           = R_CTRL0,
256         .r_timings         = R_TIMINGS,
257         .conf_enable_w0    = CONF_ENABLE_W0,
258         .max_slaves        = 2,
259         .segments          = aspeed_segments_ast2500_spi2,
260         .flash_window_base = ASPEED_SOC_SPI2_FLASH_BASE,
261         .flash_window_size = 0x8000000,
262         .has_dma           = false,
263         .nregs             = ASPEED_SMC_R_MAX,
264     },
265 };
266 
267 /*
268  * The Segment Register uses a 8MB unit to encode the start address
269  * and the end address of the mapping window of a flash SPI slave :
270  *
271  *        | byte 1 | byte 2 | byte 3 | byte 4 |
272  *        +--------+--------+--------+--------+
273  *        |  end   |  start |   0    |   0    |
274  *
275  */
276 static inline uint32_t aspeed_smc_segment_to_reg(const AspeedSegments *seg)
277 {
278     uint32_t reg = 0;
279     reg |= ((seg->addr >> 23) & SEG_START_MASK) << SEG_START_SHIFT;
280     reg |= (((seg->addr + seg->size) >> 23) & SEG_END_MASK) << SEG_END_SHIFT;
281     return reg;
282 }
283 
284 static inline void aspeed_smc_reg_to_segment(uint32_t reg, AspeedSegments *seg)
285 {
286     seg->addr = ((reg >> SEG_START_SHIFT) & SEG_START_MASK) << 23;
287     seg->size = (((reg >> SEG_END_SHIFT) & SEG_END_MASK) << 23) - seg->addr;
288 }
289 
290 static bool aspeed_smc_flash_overlap(const AspeedSMCState *s,
291                                      const AspeedSegments *new,
292                                      int cs)
293 {
294     AspeedSegments seg;
295     int i;
296 
297     for (i = 0; i < s->ctrl->max_slaves; i++) {
298         if (i == cs) {
299             continue;
300         }
301 
302         aspeed_smc_reg_to_segment(s->regs[R_SEG_ADDR0 + i], &seg);
303 
304         if (new->addr + new->size > seg.addr &&
305             new->addr < seg.addr + seg.size) {
306             qemu_log_mask(LOG_GUEST_ERROR, "%s: new segment CS%d [ 0x%"
307                           HWADDR_PRIx" - 0x%"HWADDR_PRIx" ] overlaps with "
308                           "CS%d [ 0x%"HWADDR_PRIx" - 0x%"HWADDR_PRIx" ]\n",
309                           s->ctrl->name, cs, new->addr, new->addr + new->size,
310                           i, seg.addr, seg.addr + seg.size);
311             return true;
312         }
313     }
314     return false;
315 }
316 
317 static void aspeed_smc_flash_set_segment(AspeedSMCState *s, int cs,
318                                          uint64_t new)
319 {
320     AspeedSMCFlash *fl = &s->flashes[cs];
321     AspeedSegments seg;
322 
323     aspeed_smc_reg_to_segment(new, &seg);
324 
325     /* The start address of CS0 is read-only */
326     if (cs == 0 && seg.addr != s->ctrl->flash_window_base) {
327         qemu_log_mask(LOG_GUEST_ERROR,
328                       "%s: Tried to change CS0 start address to 0x%"
329                       HWADDR_PRIx "\n", s->ctrl->name, seg.addr);
330         seg.addr = s->ctrl->flash_window_base;
331         new = aspeed_smc_segment_to_reg(&seg);
332     }
333 
334     /*
335      * The end address of the AST2500 spi controllers is also
336      * read-only.
337      */
338     if ((s->ctrl->segments == aspeed_segments_ast2500_spi1 ||
339          s->ctrl->segments == aspeed_segments_ast2500_spi2) &&
340         cs == s->ctrl->max_slaves &&
341         seg.addr + seg.size != s->ctrl->segments[cs].addr +
342         s->ctrl->segments[cs].size) {
343         qemu_log_mask(LOG_GUEST_ERROR,
344                       "%s: Tried to change CS%d end address to 0x%"
345                       HWADDR_PRIx "\n", s->ctrl->name, cs, seg.addr + seg.size);
346         seg.size = s->ctrl->segments[cs].addr + s->ctrl->segments[cs].size -
347             seg.addr;
348         new = aspeed_smc_segment_to_reg(&seg);
349     }
350 
351     /* Keep the segment in the overall flash window */
352     if (seg.addr + seg.size <= s->ctrl->flash_window_base ||
353         seg.addr > s->ctrl->flash_window_base + s->ctrl->flash_window_size) {
354         qemu_log_mask(LOG_GUEST_ERROR, "%s: new segment for CS%d is invalid : "
355                       "[ 0x%"HWADDR_PRIx" - 0x%"HWADDR_PRIx" ]\n",
356                       s->ctrl->name, cs, seg.addr, seg.addr + seg.size);
357         return;
358     }
359 
360     /* Check start address vs. alignment */
361     if (seg.size && !QEMU_IS_ALIGNED(seg.addr, seg.size)) {
362         qemu_log_mask(LOG_GUEST_ERROR, "%s: new segment for CS%d is not "
363                       "aligned : [ 0x%"HWADDR_PRIx" - 0x%"HWADDR_PRIx" ]\n",
364                       s->ctrl->name, cs, seg.addr, seg.addr + seg.size);
365     }
366 
367     /* And segments should not overlap (in the specs) */
368     aspeed_smc_flash_overlap(s, &seg, cs);
369 
370     /* All should be fine now to move the region */
371     memory_region_transaction_begin();
372     memory_region_set_size(&fl->mmio, seg.size);
373     memory_region_set_address(&fl->mmio, seg.addr - s->ctrl->flash_window_base);
374     memory_region_set_enabled(&fl->mmio, true);
375     memory_region_transaction_commit();
376 
377     s->regs[R_SEG_ADDR0 + cs] = new;
378 }
379 
380 static uint64_t aspeed_smc_flash_default_read(void *opaque, hwaddr addr,
381                                               unsigned size)
382 {
383     qemu_log_mask(LOG_GUEST_ERROR, "%s: To 0x%" HWADDR_PRIx " of size %u"
384                   PRIx64 "\n", __func__, addr, size);
385     return 0;
386 }
387 
388 static void aspeed_smc_flash_default_write(void *opaque, hwaddr addr,
389                                            uint64_t data, unsigned size)
390 {
391    qemu_log_mask(LOG_GUEST_ERROR, "%s: To 0x%" HWADDR_PRIx " of size %u: 0x%"
392                  PRIx64 "\n", __func__, addr, size, data);
393 }
394 
395 static const MemoryRegionOps aspeed_smc_flash_default_ops = {
396     .read = aspeed_smc_flash_default_read,
397     .write = aspeed_smc_flash_default_write,
398     .endianness = DEVICE_LITTLE_ENDIAN,
399     .valid = {
400         .min_access_size = 1,
401         .max_access_size = 4,
402     },
403 };
404 
405 static inline int aspeed_smc_flash_mode(const AspeedSMCFlash *fl)
406 {
407     const AspeedSMCState *s = fl->controller;
408 
409     return s->regs[s->r_ctrl0 + fl->id] & CTRL_CMD_MODE_MASK;
410 }
411 
412 static inline bool aspeed_smc_is_writable(const AspeedSMCFlash *fl)
413 {
414     const AspeedSMCState *s = fl->controller;
415 
416     return s->regs[s->r_conf] & (1 << (s->conf_enable_w0 + fl->id));
417 }
418 
419 static inline int aspeed_smc_flash_cmd(const AspeedSMCFlash *fl)
420 {
421     const AspeedSMCState *s = fl->controller;
422     int cmd = (s->regs[s->r_ctrl0 + fl->id] >> CTRL_CMD_SHIFT) & CTRL_CMD_MASK;
423 
424     /* In read mode, the default SPI command is READ (0x3). In other
425      * modes, the command should necessarily be defined */
426     if (aspeed_smc_flash_mode(fl) == CTRL_READMODE) {
427         cmd = SPI_OP_READ;
428     }
429 
430     if (!cmd) {
431         qemu_log_mask(LOG_GUEST_ERROR, "%s: no command defined for mode %d\n",
432                       __func__, aspeed_smc_flash_mode(fl));
433     }
434 
435     return cmd;
436 }
437 
438 static inline int aspeed_smc_flash_is_4byte(const AspeedSMCFlash *fl)
439 {
440     const AspeedSMCState *s = fl->controller;
441 
442     if (s->ctrl->segments == aspeed_segments_spi) {
443         return s->regs[s->r_ctrl0] & CTRL_AST2400_SPI_4BYTE;
444     } else {
445         return s->regs[s->r_ce_ctrl] & (1 << (CTRL_EXTENDED0 + fl->id));
446     }
447 }
448 
449 static inline bool aspeed_smc_is_ce_stop_active(const AspeedSMCFlash *fl)
450 {
451     const AspeedSMCState *s = fl->controller;
452 
453     return s->regs[s->r_ctrl0 + fl->id] & CTRL_CE_STOP_ACTIVE;
454 }
455 
456 static void aspeed_smc_flash_select(AspeedSMCFlash *fl)
457 {
458     AspeedSMCState *s = fl->controller;
459 
460     s->regs[s->r_ctrl0 + fl->id] &= ~CTRL_CE_STOP_ACTIVE;
461     qemu_set_irq(s->cs_lines[fl->id], aspeed_smc_is_ce_stop_active(fl));
462 }
463 
464 static void aspeed_smc_flash_unselect(AspeedSMCFlash *fl)
465 {
466     AspeedSMCState *s = fl->controller;
467 
468     s->regs[s->r_ctrl0 + fl->id] |= CTRL_CE_STOP_ACTIVE;
469     qemu_set_irq(s->cs_lines[fl->id], aspeed_smc_is_ce_stop_active(fl));
470 }
471 
472 static uint32_t aspeed_smc_check_segment_addr(const AspeedSMCFlash *fl,
473                                               uint32_t addr)
474 {
475     const AspeedSMCState *s = fl->controller;
476     AspeedSegments seg;
477 
478     aspeed_smc_reg_to_segment(s->regs[R_SEG_ADDR0 + fl->id], &seg);
479     if ((addr % seg.size) != addr) {
480         qemu_log_mask(LOG_GUEST_ERROR,
481                       "%s: invalid address 0x%08x for CS%d segment : "
482                       "[ 0x%"HWADDR_PRIx" - 0x%"HWADDR_PRIx" ]\n",
483                       s->ctrl->name, addr, fl->id, seg.addr,
484                       seg.addr + seg.size);
485         addr %= seg.size;
486     }
487 
488     return addr;
489 }
490 
491 static int aspeed_smc_flash_dummies(const AspeedSMCFlash *fl)
492 {
493     const AspeedSMCState *s = fl->controller;
494     uint32_t r_ctrl0 = s->regs[s->r_ctrl0 + fl->id];
495     uint32_t dummy_high = (r_ctrl0 >> CTRL_DUMMY_HIGH_SHIFT) & 0x1;
496     uint32_t dummy_low = (r_ctrl0 >> CTRL_DUMMY_LOW_SHIFT) & 0x3;
497     uint32_t dummies = ((dummy_high << 2) | dummy_low) * 8;
498 
499     if (r_ctrl0 & CTRL_IO_DUAL_ADDR_DATA) {
500         dummies /= 2;
501     }
502 
503     return dummies;
504 }
505 
506 static void aspeed_smc_flash_send_addr(AspeedSMCFlash *fl, uint32_t addr)
507 {
508     const AspeedSMCState *s = fl->controller;
509     uint8_t cmd = aspeed_smc_flash_cmd(fl);
510 
511     /* Flash access can not exceed CS segment */
512     addr = aspeed_smc_check_segment_addr(fl, addr);
513 
514     ssi_transfer(s->spi, cmd);
515 
516     if (aspeed_smc_flash_is_4byte(fl)) {
517         ssi_transfer(s->spi, (addr >> 24) & 0xff);
518     }
519     ssi_transfer(s->spi, (addr >> 16) & 0xff);
520     ssi_transfer(s->spi, (addr >> 8) & 0xff);
521     ssi_transfer(s->spi, (addr & 0xff));
522 }
523 
524 static uint64_t aspeed_smc_flash_read(void *opaque, hwaddr addr, unsigned size)
525 {
526     AspeedSMCFlash *fl = opaque;
527     AspeedSMCState *s = fl->controller;
528     uint64_t ret = 0;
529     int i;
530 
531     switch (aspeed_smc_flash_mode(fl)) {
532     case CTRL_USERMODE:
533         for (i = 0; i < size; i++) {
534             ret |= ssi_transfer(s->spi, 0x0) << (8 * i);
535         }
536         break;
537     case CTRL_READMODE:
538     case CTRL_FREADMODE:
539         aspeed_smc_flash_select(fl);
540         aspeed_smc_flash_send_addr(fl, addr);
541 
542         /*
543          * Use fake transfers to model dummy bytes. The value should
544          * be configured to some non-zero value in fast read mode and
545          * zero in read mode. But, as the HW allows inconsistent
546          * settings, let's check for fast read mode.
547          */
548         if (aspeed_smc_flash_mode(fl) == CTRL_FREADMODE) {
549             for (i = 0; i < aspeed_smc_flash_dummies(fl); i++) {
550                 ssi_transfer(fl->controller->spi, 0xFF);
551             }
552         }
553 
554         for (i = 0; i < size; i++) {
555             ret |= ssi_transfer(s->spi, 0x0) << (8 * i);
556         }
557 
558         aspeed_smc_flash_unselect(fl);
559         break;
560     default:
561         qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid flash mode %d\n",
562                       __func__, aspeed_smc_flash_mode(fl));
563     }
564 
565     return ret;
566 }
567 
568 static void aspeed_smc_flash_write(void *opaque, hwaddr addr, uint64_t data,
569                            unsigned size)
570 {
571     AspeedSMCFlash *fl = opaque;
572     AspeedSMCState *s = fl->controller;
573     int i;
574 
575     if (!aspeed_smc_is_writable(fl)) {
576         qemu_log_mask(LOG_GUEST_ERROR, "%s: flash is not writable at 0x%"
577                       HWADDR_PRIx "\n", __func__, addr);
578         return;
579     }
580 
581     switch (aspeed_smc_flash_mode(fl)) {
582     case CTRL_USERMODE:
583         for (i = 0; i < size; i++) {
584             ssi_transfer(s->spi, (data >> (8 * i)) & 0xff);
585         }
586         break;
587     case CTRL_WRITEMODE:
588         aspeed_smc_flash_select(fl);
589         aspeed_smc_flash_send_addr(fl, addr);
590 
591         for (i = 0; i < size; i++) {
592             ssi_transfer(s->spi, (data >> (8 * i)) & 0xff);
593         }
594 
595         aspeed_smc_flash_unselect(fl);
596         break;
597     default:
598         qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid flash mode %d\n",
599                       __func__, aspeed_smc_flash_mode(fl));
600     }
601 }
602 
603 static const MemoryRegionOps aspeed_smc_flash_ops = {
604     .read = aspeed_smc_flash_read,
605     .write = aspeed_smc_flash_write,
606     .endianness = DEVICE_LITTLE_ENDIAN,
607     .valid = {
608         .min_access_size = 1,
609         .max_access_size = 4,
610     },
611 };
612 
613 static void aspeed_smc_flash_update_cs(AspeedSMCFlash *fl)
614 {
615     const AspeedSMCState *s = fl->controller;
616 
617     qemu_set_irq(s->cs_lines[fl->id], aspeed_smc_is_ce_stop_active(fl));
618 }
619 
620 static void aspeed_smc_reset(DeviceState *d)
621 {
622     AspeedSMCState *s = ASPEED_SMC(d);
623     int i;
624 
625     memset(s->regs, 0, sizeof s->regs);
626 
627     /* Pretend DMA is done (u-boot initialization) */
628     s->regs[R_INTR_CTRL] = INTR_CTRL_DMA_STATUS;
629 
630     /* Unselect all slaves */
631     for (i = 0; i < s->num_cs; ++i) {
632         s->regs[s->r_ctrl0 + i] |= CTRL_CE_STOP_ACTIVE;
633         qemu_set_irq(s->cs_lines[i], true);
634     }
635 
636     /* setup default segment register values for all */
637     for (i = 0; i < s->ctrl->max_slaves; ++i) {
638         s->regs[R_SEG_ADDR0 + i] =
639             aspeed_smc_segment_to_reg(&s->ctrl->segments[i]);
640     }
641 
642     /* HW strapping flash type for FMC controllers  */
643     if (s->ctrl->segments == aspeed_segments_ast2500_fmc) {
644         /* flash type is fixed to SPI for CE0 and CE1 */
645         s->regs[s->r_conf] |= (CONF_FLASH_TYPE_SPI << CONF_FLASH_TYPE0);
646         s->regs[s->r_conf] |= (CONF_FLASH_TYPE_SPI << CONF_FLASH_TYPE1);
647     }
648 
649     /* HW strapping for AST2400 FMC controllers (SCU70). Let's use the
650      * configuration of the palmetto-bmc machine */
651     if (s->ctrl->segments == aspeed_segments_fmc) {
652         s->regs[s->r_conf] |= (CONF_FLASH_TYPE_SPI << CONF_FLASH_TYPE0);
653     }
654 }
655 
656 static uint64_t aspeed_smc_read(void *opaque, hwaddr addr, unsigned int size)
657 {
658     AspeedSMCState *s = ASPEED_SMC(opaque);
659 
660     addr >>= 2;
661 
662     if (addr == s->r_conf ||
663         addr == s->r_timings ||
664         addr == s->r_ce_ctrl ||
665         addr == R_INTR_CTRL ||
666         (addr >= R_SEG_ADDR0 && addr < R_SEG_ADDR0 + s->ctrl->max_slaves) ||
667         (addr >= s->r_ctrl0 && addr < s->r_ctrl0 + s->num_cs)) {
668         return s->regs[addr];
669     } else {
670         qemu_log_mask(LOG_UNIMP, "%s: not implemented: 0x%" HWADDR_PRIx "\n",
671                       __func__, addr);
672         return 0;
673     }
674 }
675 
676 static void aspeed_smc_write(void *opaque, hwaddr addr, uint64_t data,
677                              unsigned int size)
678 {
679     AspeedSMCState *s = ASPEED_SMC(opaque);
680     uint32_t value = data;
681 
682     addr >>= 2;
683 
684     if (addr == s->r_conf ||
685         addr == s->r_timings ||
686         addr == s->r_ce_ctrl) {
687         s->regs[addr] = value;
688     } else if (addr >= s->r_ctrl0 && addr < s->r_ctrl0 + s->num_cs) {
689         int cs = addr - s->r_ctrl0;
690         s->regs[addr] = value;
691         aspeed_smc_flash_update_cs(&s->flashes[cs]);
692     } else if (addr >= R_SEG_ADDR0 &&
693                addr < R_SEG_ADDR0 + s->ctrl->max_slaves) {
694         int cs = addr - R_SEG_ADDR0;
695 
696         if (value != s->regs[R_SEG_ADDR0 + cs]) {
697             aspeed_smc_flash_set_segment(s, cs, value);
698         }
699     } else {
700         qemu_log_mask(LOG_UNIMP, "%s: not implemented: 0x%" HWADDR_PRIx "\n",
701                       __func__, addr);
702         return;
703     }
704 }
705 
706 static const MemoryRegionOps aspeed_smc_ops = {
707     .read = aspeed_smc_read,
708     .write = aspeed_smc_write,
709     .endianness = DEVICE_LITTLE_ENDIAN,
710     .valid.unaligned = true,
711 };
712 
713 static void aspeed_smc_realize(DeviceState *dev, Error **errp)
714 {
715     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
716     AspeedSMCState *s = ASPEED_SMC(dev);
717     AspeedSMCClass *mc = ASPEED_SMC_GET_CLASS(s);
718     int i;
719     char name[32];
720     hwaddr offset = 0;
721 
722     s->ctrl = mc->ctrl;
723 
724     /* keep a copy under AspeedSMCState to speed up accesses */
725     s->r_conf = s->ctrl->r_conf;
726     s->r_ce_ctrl = s->ctrl->r_ce_ctrl;
727     s->r_ctrl0 = s->ctrl->r_ctrl0;
728     s->r_timings = s->ctrl->r_timings;
729     s->conf_enable_w0 = s->ctrl->conf_enable_w0;
730 
731     /* Enforce some real HW limits */
732     if (s->num_cs > s->ctrl->max_slaves) {
733         qemu_log_mask(LOG_GUEST_ERROR, "%s: num_cs cannot exceed: %d\n",
734                       __func__, s->ctrl->max_slaves);
735         s->num_cs = s->ctrl->max_slaves;
736     }
737 
738     s->spi = ssi_create_bus(dev, "spi");
739 
740     /* Setup cs_lines for slaves */
741     sysbus_init_irq(sbd, &s->irq);
742     s->cs_lines = g_new0(qemu_irq, s->num_cs);
743     ssi_auto_connect_slaves(dev, s->cs_lines, s->spi);
744 
745     for (i = 0; i < s->num_cs; ++i) {
746         sysbus_init_irq(sbd, &s->cs_lines[i]);
747     }
748 
749     /* The memory region for the controller registers */
750     memory_region_init_io(&s->mmio, OBJECT(s), &aspeed_smc_ops, s,
751                           s->ctrl->name, s->ctrl->nregs * 4);
752     sysbus_init_mmio(sbd, &s->mmio);
753 
754     /*
755      * The container memory region representing the address space
756      * window in which the flash modules are mapped. The size and
757      * address depends on the SoC model and controller type.
758      */
759     snprintf(name, sizeof(name), "%s.flash", s->ctrl->name);
760 
761     memory_region_init_io(&s->mmio_flash, OBJECT(s),
762                           &aspeed_smc_flash_default_ops, s, name,
763                           s->ctrl->flash_window_size);
764     sysbus_init_mmio(sbd, &s->mmio_flash);
765 
766     s->flashes = g_new0(AspeedSMCFlash, s->ctrl->max_slaves);
767 
768     /*
769      * Let's create a sub memory region for each possible slave. All
770      * have a configurable memory segment in the overall flash mapping
771      * window of the controller but, there is not necessarily a flash
772      * module behind to handle the memory accesses. This depends on
773      * the board configuration.
774      */
775     for (i = 0; i < s->ctrl->max_slaves; ++i) {
776         AspeedSMCFlash *fl = &s->flashes[i];
777 
778         snprintf(name, sizeof(name), "%s.%d", s->ctrl->name, i);
779 
780         fl->id = i;
781         fl->controller = s;
782         fl->size = s->ctrl->segments[i].size;
783         memory_region_init_io(&fl->mmio, OBJECT(s), &aspeed_smc_flash_ops,
784                               fl, name, fl->size);
785         memory_region_add_subregion(&s->mmio_flash, offset, &fl->mmio);
786         offset += fl->size;
787     }
788 }
789 
790 static const VMStateDescription vmstate_aspeed_smc = {
791     .name = "aspeed.smc",
792     .version_id = 1,
793     .minimum_version_id = 1,
794     .fields = (VMStateField[]) {
795         VMSTATE_UINT32_ARRAY(regs, AspeedSMCState, ASPEED_SMC_R_MAX),
796         VMSTATE_END_OF_LIST()
797     }
798 };
799 
800 static Property aspeed_smc_properties[] = {
801     DEFINE_PROP_UINT32("num-cs", AspeedSMCState, num_cs, 1),
802     DEFINE_PROP_END_OF_LIST(),
803 };
804 
805 static void aspeed_smc_class_init(ObjectClass *klass, void *data)
806 {
807     DeviceClass *dc = DEVICE_CLASS(klass);
808     AspeedSMCClass *mc = ASPEED_SMC_CLASS(klass);
809 
810     dc->realize = aspeed_smc_realize;
811     dc->reset = aspeed_smc_reset;
812     dc->props = aspeed_smc_properties;
813     dc->vmsd = &vmstate_aspeed_smc;
814     mc->ctrl = data;
815 }
816 
817 static const TypeInfo aspeed_smc_info = {
818     .name           = TYPE_ASPEED_SMC,
819     .parent         = TYPE_SYS_BUS_DEVICE,
820     .instance_size  = sizeof(AspeedSMCState),
821     .class_size     = sizeof(AspeedSMCClass),
822     .abstract       = true,
823 };
824 
825 static void aspeed_smc_register_types(void)
826 {
827     int i;
828 
829     type_register_static(&aspeed_smc_info);
830     for (i = 0; i < ARRAY_SIZE(controllers); ++i) {
831         TypeInfo ti = {
832             .name       = controllers[i].name,
833             .parent     = TYPE_ASPEED_SMC,
834             .class_init = aspeed_smc_class_init,
835             .class_data = (void *)&controllers[i],
836         };
837         type_register(&ti);
838     }
839 }
840 
841 type_init(aspeed_smc_register_types)
842