2 * Generic Macintosh NCR5380 driver
4 * Copyright 1998, Michael Schmitz <mschmitz@lbl.gov>
6 * Copyright 2019 Finn Thain
8 * derived in part from:
11 * Generic Generic NCR5380 driver
13 * Copyright 1995, Russell King
16 #include <linux/delay.h>
17 #include <linux/types.h>
18 #include <linux/module.h>
19 #include <linux/ioport.h>
20 #include <linux/init.h>
21 #include <linux/blkdev.h>
22 #include <linux/interrupt.h>
23 #include <linux/platform_device.h>
25 #include <asm/hwtest.h>
27 #include <asm/macints.h>
28 #include <asm/setup.h>
30 #include <scsi/scsi_host.h>
32 /* Definitions for the core NCR5380 driver. */
34 #define NCR5380_implementation_fields int pdma_residual
36 #define NCR5380_read(reg) in_8(hostdata->io + ((reg) << 4))
37 #define NCR5380_write(reg, value) out_8(hostdata->io + ((reg) << 4), value)
39 #define NCR5380_dma_xfer_len macscsi_dma_xfer_len
40 #define NCR5380_dma_recv_setup macscsi_pread
41 #define NCR5380_dma_send_setup macscsi_pwrite
42 #define NCR5380_dma_residual macscsi_dma_residual
44 #define NCR5380_intr macscsi_intr
45 #define NCR5380_queue_command macscsi_queue_command
46 #define NCR5380_abort macscsi_abort
47 #define NCR5380_host_reset macscsi_host_reset
48 #define NCR5380_info macscsi_info
52 static int setup_can_queue = -1;
53 module_param(setup_can_queue, int, 0);
54 static int setup_cmd_per_lun = -1;
55 module_param(setup_cmd_per_lun, int, 0);
56 static int setup_sg_tablesize = -1;
57 module_param(setup_sg_tablesize, int, 0);
58 static int setup_use_pdma = 512;
59 module_param(setup_use_pdma, int, 0);
60 static int setup_hostid = -1;
61 module_param(setup_hostid, int, 0);
62 static int setup_toshiba_delay = -1;
63 module_param(setup_toshiba_delay, int, 0);
66 static int __init mac_scsi_setup(char *str)
70 (void)get_options(str, ARRAY_SIZE(ints), ints);
73 pr_err("Usage: mac5380=<can_queue>[,<cmd_per_lun>[,<sg_tablesize>[,<hostid>[,<use_tags>[,<use_pdma>[,<toshiba_delay>]]]]]]\n");
77 setup_can_queue = ints[1];
79 setup_cmd_per_lun = ints[2];
81 setup_sg_tablesize = ints[3];
83 setup_hostid = ints[4];
84 /* ints[5] (use_tagged_queuing) is ignored */
86 setup_use_pdma = ints[6];
88 setup_toshiba_delay = ints[7];
92 __setup("mac5380=", mac_scsi_setup);
96 * According to "Inside Macintosh: Devices", Mac OS requires disk drivers to
97 * specify the number of bytes between the delays expected from a SCSI target.
98 * This allows the operating system to "prevent bus errors when a target fails
99 * to deliver the next byte within the processor bus error timeout period."
100 * Linux SCSI drivers lack knowledge of the timing behaviour of SCSI targets
101 * so bus errors are unavoidable.
103 * If a MOVE.B instruction faults, we assume that zero bytes were transferred
104 * and simply retry. That assumption probably depends on target behaviour but
105 * seems to hold up okay. The NOP provides synchronization: without it the
106 * fault can sometimes occur after the program counter has moved past the
107 * offending instruction. Post-increment addressing can't be used.
110 #define MOVE_BYTE(operands) \
112 "1: moveb " operands " \n" \
118 ".section .fixup,\"ax\" \n" \
120 "90: movel #1, %2 \n" \
124 ".section __ex_table,\"a\" \n" \
129 : "+a" (addr), "+r" (n), "+r" (result) : "a" (io))
132 * If a MOVE.W (or MOVE.L) instruction faults, it cannot be retried because
133 * the residual byte count would be uncertain. In that situation the MOVE_WORD
134 * macro clears n in the fixup section to abort the transfer.
137 #define MOVE_WORD(operands) \
139 "1: movew " operands " \n" \
144 ".section .fixup,\"ax\" \n" \
146 "90: movel #0, %1 \n" \
151 ".section __ex_table,\"a\" \n" \
156 : "+a" (addr), "+r" (n), "+r" (result) : "a" (io))
158 #define MOVE_16_WORDS(operands) \
160 "1: movew " operands " \n" \
161 "2: movew " operands " \n" \
162 "3: movew " operands " \n" \
163 "4: movew " operands " \n" \
164 "5: movew " operands " \n" \
165 "6: movew " operands " \n" \
166 "7: movew " operands " \n" \
167 "8: movew " operands " \n" \
168 "9: movew " operands " \n" \
169 "10: movew " operands " \n" \
170 "11: movew " operands " \n" \
171 "12: movew " operands " \n" \
172 "13: movew " operands " \n" \
173 "14: movew " operands " \n" \
174 "15: movew " operands " \n" \
175 "16: movew " operands " \n" \
180 ".section .fixup,\"ax\" \n" \
182 "90: movel #0, %1 \n" \
187 ".section __ex_table,\"a\" \n" \
207 : "+a" (addr), "+r" (n), "+r" (result) : "a" (io))
209 #define MAC_PDMA_DELAY 32
211 static inline int mac_pdma_recv(void __iomem *io, unsigned char *start, int n)
213 unsigned char *addr = start;
217 MOVE_BYTE("%3@,%0@");
221 if (n >= 1 && ((unsigned long)addr & 1)) {
222 MOVE_BYTE("%3@,%0@");
227 MOVE_16_WORDS("%3@,%0@+");
229 MOVE_WORD("%3@,%0@+");
231 return start - addr; /* Negated to indicate uncertain length */
233 MOVE_BYTE("%3@,%0@");
238 static inline int mac_pdma_send(unsigned char *start, void __iomem *io, int n)
240 unsigned char *addr = start;
244 MOVE_BYTE("%0@,%3@");
248 if (n >= 1 && ((unsigned long)addr & 1)) {
249 MOVE_BYTE("%0@,%3@");
254 MOVE_16_WORDS("%0@+,%3@");
256 MOVE_WORD("%0@+,%3@");
258 return start - addr; /* Negated to indicate uncertain length */
260 MOVE_BYTE("%0@,%3@");
265 static inline int macscsi_pread(struct NCR5380_hostdata *hostdata,
266 unsigned char *dst, int len)
268 u8 __iomem *s = hostdata->pdma_io + (INPUT_DATA_REG << 4);
269 unsigned char *d = dst;
271 hostdata->pdma_residual = len;
273 while (!NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG,
274 BASR_DRQ | BASR_PHASE_MATCH,
275 BASR_DRQ | BASR_PHASE_MATCH, HZ / 64)) {
278 bytes = mac_pdma_recv(s, d, min(hostdata->pdma_residual, 512));
282 hostdata->pdma_residual -= bytes;
285 if (hostdata->pdma_residual == 0)
288 if (NCR5380_poll_politely2(hostdata, STATUS_REG, SR_REQ, SR_REQ,
289 BUS_AND_STATUS_REG, BASR_ACK,
290 BASR_ACK, HZ / 64) < 0)
291 scmd_printk(KERN_DEBUG, hostdata->connected,
292 "%s: !REQ and !ACK\n", __func__);
293 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH))
297 udelay(MAC_PDMA_DELAY);
302 dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host,
303 "%s: bus error (%d/%d)\n", __func__, d - dst, len);
304 NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
308 scmd_printk(KERN_ERR, hostdata->connected,
309 "%s: phase mismatch or !DRQ\n", __func__);
310 NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
314 static inline int macscsi_pwrite(struct NCR5380_hostdata *hostdata,
315 unsigned char *src, int len)
317 unsigned char *s = src;
318 u8 __iomem *d = hostdata->pdma_io + (OUTPUT_DATA_REG << 4);
320 hostdata->pdma_residual = len;
322 while (!NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG,
323 BASR_DRQ | BASR_PHASE_MATCH,
324 BASR_DRQ | BASR_PHASE_MATCH, HZ / 64)) {
327 bytes = mac_pdma_send(s, d, min(hostdata->pdma_residual, 512));
331 hostdata->pdma_residual -= bytes;
334 if (hostdata->pdma_residual == 0) {
335 if (NCR5380_poll_politely(hostdata, TARGET_COMMAND_REG,
337 TCR_LAST_BYTE_SENT, HZ / 64) < 0)
338 scmd_printk(KERN_ERR, hostdata->connected,
339 "%s: Last Byte Sent timeout\n", __func__);
343 if (NCR5380_poll_politely2(hostdata, STATUS_REG, SR_REQ, SR_REQ,
344 BUS_AND_STATUS_REG, BASR_ACK,
345 BASR_ACK, HZ / 64) < 0)
346 scmd_printk(KERN_DEBUG, hostdata->connected,
347 "%s: !REQ and !ACK\n", __func__);
348 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH))
352 udelay(MAC_PDMA_DELAY);
357 dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host,
358 "%s: bus error (%d/%d)\n", __func__, s - src, len);
359 NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
363 scmd_printk(KERN_ERR, hostdata->connected,
364 "%s: phase mismatch or !DRQ\n", __func__);
365 NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
369 static int macscsi_dma_xfer_len(struct NCR5380_hostdata *hostdata,
370 struct scsi_cmnd *cmd)
372 if (hostdata->flags & FLAG_NO_PSEUDO_DMA ||
373 cmd->SCp.this_residual < setup_use_pdma)
376 return cmd->SCp.this_residual;
379 static int macscsi_dma_residual(struct NCR5380_hostdata *hostdata)
381 return hostdata->pdma_residual;
386 #define DRV_MODULE_NAME "mac_scsi"
387 #define PFX DRV_MODULE_NAME ": "
389 static struct scsi_host_template mac_scsi_template = {
390 .module = THIS_MODULE,
391 .proc_name = DRV_MODULE_NAME,
392 .name = "Macintosh NCR5380 SCSI",
393 .info = macscsi_info,
394 .queuecommand = macscsi_queue_command,
395 .eh_abort_handler = macscsi_abort,
396 .eh_host_reset_handler = macscsi_host_reset,
401 .use_clustering = DISABLE_CLUSTERING,
402 .cmd_size = NCR5380_CMD_SIZE,
406 static int __init mac_scsi_probe(struct platform_device *pdev)
408 struct Scsi_Host *instance;
409 struct NCR5380_hostdata *hostdata;
412 struct resource *irq, *pio_mem, *pdma_mem = NULL;
414 pio_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
418 pdma_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
420 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
422 if (!hwreg_present((unsigned char *)pio_mem->start +
423 (STATUS_REG << 4))) {
424 pr_info(PFX "no device detected at %pap\n", &pio_mem->start);
428 if (setup_can_queue > 0)
429 mac_scsi_template.can_queue = setup_can_queue;
430 if (setup_cmd_per_lun > 0)
431 mac_scsi_template.cmd_per_lun = setup_cmd_per_lun;
432 if (setup_sg_tablesize > 0)
433 mac_scsi_template.sg_tablesize = setup_sg_tablesize;
434 if (setup_hostid >= 0)
435 mac_scsi_template.this_id = setup_hostid & 7;
437 instance = scsi_host_alloc(&mac_scsi_template,
438 sizeof(struct NCR5380_hostdata));
443 instance->irq = irq->start;
445 instance->irq = NO_IRQ;
447 hostdata = shost_priv(instance);
448 hostdata->base = pio_mem->start;
449 hostdata->io = (u8 __iomem *)pio_mem->start;
451 if (pdma_mem && setup_use_pdma)
452 hostdata->pdma_io = (u8 __iomem *)pdma_mem->start;
454 host_flags |= FLAG_NO_PSEUDO_DMA;
456 host_flags |= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0;
458 error = NCR5380_init(instance, host_flags | FLAG_LATE_DMA_SETUP);
462 if (instance->irq != NO_IRQ) {
463 error = request_irq(instance->irq, macscsi_intr, IRQF_SHARED,
464 "NCR5380", instance);
469 NCR5380_maybe_reset_bus(instance);
471 error = scsi_add_host(instance, NULL);
475 platform_set_drvdata(pdev, instance);
477 scsi_scan_host(instance);
481 if (instance->irq != NO_IRQ)
482 free_irq(instance->irq, instance);
484 NCR5380_exit(instance);
486 scsi_host_put(instance);
490 static int __exit mac_scsi_remove(struct platform_device *pdev)
492 struct Scsi_Host *instance = platform_get_drvdata(pdev);
494 scsi_remove_host(instance);
495 if (instance->irq != NO_IRQ)
496 free_irq(instance->irq, instance);
497 NCR5380_exit(instance);
498 scsi_host_put(instance);
502 static struct platform_driver mac_scsi_driver = {
503 .remove = __exit_p(mac_scsi_remove),
505 .name = DRV_MODULE_NAME,
509 module_platform_driver_probe(mac_scsi_driver, mac_scsi_probe);
511 MODULE_ALIAS("platform:" DRV_MODULE_NAME);
512 MODULE_LICENSE("GPL");