2 * QEMU ESP/NCR53C9x emulation
4 * Copyright (c) 2005-2006 Fabrice Bellard
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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
30 * On Sparc32, this is the ESP (NCR53C90) part of chip STP2000 (Master I/O), also
31 * produced as NCR89C100. See
32 * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C100.txt
34 * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR53C9X.txt
38 #define DPRINTF(fmt, args...) \
39 do { printf("ESP: " fmt , ##args); } while (0)
41 #define DPRINTF(fmt, args...)
44 #define ESP_MAXREG 0x3f
47 typedef struct ESPState ESPState;
50 BlockDriverState **bd;
51 uint8_t rregs[ESP_MAXREG];
52 uint8_t wregs[ESP_MAXREG];
54 uint32_t ti_rptr, ti_wptr;
55 uint8_t ti_buf[TI_BUFSZ];
58 SCSIDevice *scsi_dev[MAX_DISKS];
59 SCSIDevice *current_dev;
60 uint8_t cmdbuf[TI_BUFSZ];
90 static int get_cmd(ESPState *s, uint8_t *buf)
95 dmalen = s->wregs[0] | (s->wregs[1] << 8);
96 target = s->wregs[4] & 7;
97 DPRINTF("get_cmd: len %d target %d\n", dmalen, target);
99 espdma_memory_read(s->dma_opaque, buf, dmalen);
102 memcpy(&buf[1], s->ti_buf, dmalen);
110 if (s->current_dev) {
111 /* Started a new command before the old one finished. Cancel it. */
112 scsi_cancel_io(s->current_dev, 0);
116 if (target >= MAX_DISKS || !s->scsi_dev[target]) {
118 s->rregs[4] = STAT_IN;
119 s->rregs[5] = INTR_DC;
121 espdma_raise_irq(s->dma_opaque);
124 s->current_dev = s->scsi_dev[target];
128 static void do_cmd(ESPState *s, uint8_t *buf)
133 DPRINTF("do_cmd: busid 0x%x\n", buf[0]);
135 datalen = scsi_send_command(s->current_dev, 0, &buf[1], lun);
136 s->ti_size = datalen;
138 s->rregs[4] = STAT_IN | STAT_TC;
141 s->rregs[4] |= STAT_DI;
142 scsi_read_data(s->current_dev, 0);
144 s->rregs[4] |= STAT_DO;
145 scsi_write_data(s->current_dev, 0);
148 s->rregs[5] = INTR_BS | INTR_FC;
149 s->rregs[6] = SEQ_CD;
150 espdma_raise_irq(s->dma_opaque);
153 static void handle_satn(ESPState *s)
158 len = get_cmd(s, buf);
163 static void handle_satn_stop(ESPState *s)
165 s->cmdlen = get_cmd(s, s->cmdbuf);
167 DPRINTF("Set ATN & Stop: cmdlen %d\n", s->cmdlen);
169 s->rregs[4] = STAT_IN | STAT_TC | STAT_CD;
170 s->rregs[5] = INTR_BS | INTR_FC;
171 s->rregs[6] = SEQ_CD;
172 espdma_raise_irq(s->dma_opaque);
176 static void write_response(ESPState *s)
178 DPRINTF("Transfer status (sense=%d)\n", s->sense);
179 s->ti_buf[0] = s->sense;
182 espdma_memory_write(s->dma_opaque, s->ti_buf, 2);
183 s->rregs[4] = STAT_IN | STAT_TC | STAT_ST;
184 s->rregs[5] = INTR_BS | INTR_FC;
185 s->rregs[6] = SEQ_CD;
192 espdma_raise_irq(s->dma_opaque);
195 static void esp_dma_done(ESPState *s)
197 s->rregs[4] |= STAT_IN | STAT_TC;
198 s->rregs[5] = INTR_BS;
201 espdma_raise_irq(s->dma_opaque);
204 static void esp_do_dma(ESPState *s)
209 to_device = (s->ti_size < 0);
212 DPRINTF("command len %d + %d\n", s->cmdlen, len);
213 espdma_memory_read(s->dma_opaque, &s->cmdbuf[s->cmdlen], len);
217 do_cmd(s, s->cmdbuf);
220 if (s->async_len == 0) {
221 /* Defer until data is available. */
224 if (len > s->async_len) {
228 espdma_memory_read(s->dma_opaque, s->async_buf, len);
230 espdma_memory_write(s->dma_opaque, s->async_buf, len);
235 if (s->async_len == 0) {
237 // ti_size is negative
239 scsi_write_data(s->current_dev, 0);
242 scsi_read_data(s->current_dev, 0);
245 if (s->dma_left == 0) {
250 static void esp_command_complete(void *opaque, int reason, uint32_t tag,
253 ESPState *s = (ESPState *)opaque;
255 if (reason == SCSI_REASON_DONE) {
256 DPRINTF("SCSI Command complete\n");
258 DPRINTF("SCSI command completed unexpectedly\n");
263 DPRINTF("Command failed\n");
265 s->rregs[4] = STAT_ST;
267 s->current_dev = NULL;
269 DPRINTF("transfer %d/%d\n", s->dma_left, s->ti_size);
271 s->async_buf = scsi_get_buf(s->current_dev, 0);
277 static void handle_ti(ESPState *s)
279 uint32_t dmalen, minlen;
281 dmalen = s->wregs[0] | (s->wregs[1] << 8);
287 minlen = (dmalen < 32) ? dmalen : 32;
288 else if (s->ti_size < 0)
289 minlen = (dmalen < -s->ti_size) ? dmalen : -s->ti_size;
291 minlen = (dmalen < s->ti_size) ? dmalen : s->ti_size;
292 DPRINTF("Transfer Information len %d\n", minlen);
294 s->dma_left = minlen;
295 s->rregs[4] &= ~STAT_TC;
297 } else if (s->do_cmd) {
298 DPRINTF("command len %d\n", s->cmdlen);
302 do_cmd(s, s->cmdbuf);
307 void esp_reset(void *opaque)
309 ESPState *s = opaque;
311 memset(s->rregs, 0, ESP_MAXREG);
312 memset(s->wregs, 0, ESP_MAXREG);
313 s->rregs[0x0e] = 0x4; // Indicate fas100a
321 static uint32_t esp_mem_readb(void *opaque, target_phys_addr_t addr)
323 ESPState *s = opaque;
326 saddr = (addr & ESP_MAXREG) >> 2;
327 DPRINTF("read reg[%d]: 0x%2.2x\n", saddr, s->rregs[saddr]);
331 if (s->ti_size > 0) {
333 if ((s->rregs[4] & 6) == 0) {
335 fprintf(stderr, "esp: PIO data read not implemented\n");
338 s->rregs[2] = s->ti_buf[s->ti_rptr++];
340 espdma_raise_irq(s->dma_opaque);
342 if (s->ti_size == 0) {
349 // Clear interrupt/error status bits
350 s->rregs[4] &= ~(STAT_IN | STAT_GE | STAT_PE);
351 espdma_clear_irq(s->dma_opaque);
356 return s->rregs[saddr];
359 static void esp_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
361 ESPState *s = opaque;
364 saddr = (addr & ESP_MAXREG) >> 2;
365 DPRINTF("write reg[%d]: 0x%2.2x -> 0x%2.2x\n", saddr, s->wregs[saddr], val);
369 s->rregs[saddr] = val;
370 s->rregs[4] &= ~STAT_TC;
375 s->cmdbuf[s->cmdlen++] = val & 0xff;
376 } else if ((s->rregs[4] & 6) == 0) {
380 fprintf(stderr, "esp: PIO data write not implemented\n");
383 s->ti_buf[s->ti_wptr++] = val & 0xff;
387 s->rregs[saddr] = val;
396 DPRINTF("NOP (%2.2x)\n", val);
399 DPRINTF("Flush FIFO (%2.2x)\n", val);
401 s->rregs[5] = INTR_FC;
405 DPRINTF("Chip reset (%2.2x)\n", val);
409 DPRINTF("Bus reset (%2.2x)\n", val);
410 s->rregs[5] = INTR_RST;
411 if (!(s->wregs[8] & 0x40)) {
412 espdma_raise_irq(s->dma_opaque);
419 DPRINTF("Initiator Command Complete Sequence (%2.2x)\n", val);
423 DPRINTF("Message Accepted (%2.2x)\n", val);
425 s->rregs[5] = INTR_DC;
429 DPRINTF("Set ATN (%2.2x)\n", val);
432 DPRINTF("Set ATN (%2.2x)\n", val);
436 DPRINTF("Set ATN & stop (%2.2x)\n", val);
440 DPRINTF("Unhandled ESP command (%2.2x)\n", val);
447 s->rregs[saddr] = val;
452 s->rregs[saddr] = val & 0x15;
455 s->rregs[saddr] = val;
460 s->wregs[saddr] = val;
463 static CPUReadMemoryFunc *esp_mem_read[3] = {
469 static CPUWriteMemoryFunc *esp_mem_write[3] = {
475 static void esp_save(QEMUFile *f, void *opaque)
477 ESPState *s = opaque;
479 qemu_put_buffer(f, s->rregs, ESP_MAXREG);
480 qemu_put_buffer(f, s->wregs, ESP_MAXREG);
481 qemu_put_be32s(f, &s->ti_size);
482 qemu_put_be32s(f, &s->ti_rptr);
483 qemu_put_be32s(f, &s->ti_wptr);
484 qemu_put_buffer(f, s->ti_buf, TI_BUFSZ);
485 qemu_put_be32s(f, &s->dma);
488 static int esp_load(QEMUFile *f, void *opaque, int version_id)
490 ESPState *s = opaque;
493 return -EINVAL; // Cannot emulate 1
495 qemu_get_buffer(f, s->rregs, ESP_MAXREG);
496 qemu_get_buffer(f, s->wregs, ESP_MAXREG);
497 qemu_get_be32s(f, &s->ti_size);
498 qemu_get_be32s(f, &s->ti_rptr);
499 qemu_get_be32s(f, &s->ti_wptr);
500 qemu_get_buffer(f, s->ti_buf, TI_BUFSZ);
501 qemu_get_be32s(f, &s->dma);
506 void *esp_init(BlockDriverState **bd, uint32_t espaddr, void *dma_opaque)
512 s = qemu_mallocz(sizeof(ESPState));
517 s->dma_opaque = dma_opaque;
519 esp_io_memory = cpu_register_io_memory(0, esp_mem_read, esp_mem_write, s);
520 cpu_register_physical_memory(espaddr, ESP_MAXREG*4, esp_io_memory);
524 register_savevm("esp", espaddr, 2, esp_save, esp_load, s);
525 qemu_register_reset(esp_reset, s);
526 for (i = 0; i < MAX_DISKS; i++) {
528 /* Command queueing is not implemented. */
530 scsi_disk_init(bs_table[i], 0, esp_command_complete, s);