1 /* mca_53c9x.c: Driver for the SCSI adapter found on NCR 35xx
2 * (and maybe some other) Microchannel machines
4 * Code taken mostly from Cyberstorm SCSI drivers
5 * Copyright (C) 1996 Jesper Skov (jskov@cygnus.co.uk)
7 * Hacked to work with the NCR MCA stuff by Tymm Twillman (tymm@computer.org)
9 * The CyberStorm SCSI driver (and this driver) is based on David S. Miller's
10 * ESP driver * for the Sparc computers.
12 * Special thanks to Ken Stewart at Symbios (LSI) for helping with info on
13 * the 86C01. I was on the brink of going ga-ga...
15 * Also thanks to Jesper Skov for helping me with info on how the Amiga
20 * This is currently only set up to use one 53c9x card at a time; it could be
21 * changed fairly easily to detect/use more than one, but I'm not too sure how
22 * many cards that use the 53c9x on MCA systems there are (if, in fact, there
23 * are cards that use them, other than the one built into some NCR systems)...
24 * If anyone requests this, I'll throw it in, otherwise it's not worth the
29 * Info on the 86C01 MCA interface chip at the bottom, if you care enough to
33 #include <linux/delay.h>
34 #include <linux/interrupt.h>
35 #include <linux/kernel.h>
36 #include <linux/mca.h>
37 #include <linux/types.h>
38 #include <linux/string.h>
39 #include <linux/slab.h>
40 #include <linux/blkdev.h>
41 #include <linux/proc_fs.h>
42 #include <linux/stat.h>
43 #include <linux/mca-legacy.h>
46 #include <scsi/scsi_host.h>
51 #include <asm/mca_dma.h>
52 #include <asm/pgtable.h>
55 * From ibmmca.c (IBM scsi controller card driver) -- used for turning PS2 disk
56 * activity LED on and off
59 #define PS2_SYS_CTR 0x92
61 /* Ports the ncr's 53c94 can be put at; indexed by pos register value */
63 #define MCA_53C9X_IO_PORTS { \
64 0x0000, 0x0240, 0x0340, 0x0400, \
65 0x0420, 0x3240, 0x8240, 0xA240, \
69 * Supposedly there were some cards put together with the 'c9x and 86c01. If
70 * they have different ID's from the ones on the 3500 series machines,
71 * you can add them here and hopefully things will work out.
74 #define MCA_53C9X_IDS { \
79 static int dma_bytes_sent(struct NCR_ESP *, int);
80 static int dma_can_transfer(struct NCR_ESP *, Scsi_Cmnd *);
81 static void dma_dump_state(struct NCR_ESP *);
82 static void dma_init_read(struct NCR_ESP *, __u32, int);
83 static void dma_init_write(struct NCR_ESP *, __u32, int);
84 static void dma_ints_off(struct NCR_ESP *);
85 static void dma_ints_on(struct NCR_ESP *);
86 static int dma_irq_p(struct NCR_ESP *);
87 static int dma_ports_p(struct NCR_ESP *);
88 static void dma_setup(struct NCR_ESP *, __u32, int, int);
89 static void dma_led_on(struct NCR_ESP *);
90 static void dma_led_off(struct NCR_ESP *);
92 /* This is where all commands are put before they are trasfered to the
96 static volatile unsigned char cmd_buffer[16];
99 * We keep the structure that is used to access the registers on the 53c9x
103 static struct ESP_regs eregs;
105 /***************************************************************** Detection */
106 static int mca_esp_detect(struct scsi_host_template *tpnt)
109 static int io_port_by_pos[] = MCA_53C9X_IO_PORTS;
110 int mca_53c9x_ids[] = MCA_53C9X_IDS;
111 int *id_to_check = mca_53c9x_ids;
114 unsigned int tmp_io_addr;
115 unsigned char tmp_byte;
121 while (*id_to_check) {
122 if ((slot = mca_find_adapter(*id_to_check, 0)) !=
125 esp = esp_allocate(tpnt, NULL, 0);
127 pos[0] = mca_read_stored_pos(slot, 2);
128 pos[1] = mca_read_stored_pos(slot, 3);
129 pos[2] = mca_read_stored_pos(slot, 4);
134 * IO port base is given in the first (non-ID) pos
138 * ----------------------------
150 io_port_by_pos[(pos[0] & 0x0E) >> 1];
152 esp->eregs->io_addr = tmp_io_addr + 0x10;
154 if (esp->eregs->io_addr == 0x0000) {
155 printk("Adapter is disabled.\n");
160 * IRQ is specified in bits 4 and 5:
163 * -----------------------
170 esp->irq = ((pos[0] & 0x30) >> 3) + 3;
173 * DMA channel is in the low 3 bits of the second
177 esp->dma = pos[1] & 7;
180 if (request_irq(esp->irq, esp_intr, 0,
181 "NCR 53c9x SCSI", esp->ehost))
183 printk("Unable to request IRQ %d.\n", esp->irq);
185 scsi_unregister(esp->ehost);
189 if (request_dma(esp->dma, "NCR 53c9x SCSI")) {
190 printk("Unable to request DMA channel %d.\n",
192 free_irq(esp->irq, esp_intr);
194 scsi_unregister(esp->ehost);
198 request_region(tmp_io_addr, 32, "NCR 53c9x SCSI");
201 * 86C01 handles DMA, IO mode, from address
205 mca_disable_dma(esp->dma);
206 mca_set_dma_io(esp->dma, tmp_io_addr + 0x0a);
207 mca_enable_dma(esp->dma);
209 /* Tell the 86C01 to give us interrupts */
211 tmp_byte = inb(tmp_io_addr + 0x02) | 0x40;
212 outb(tmp_byte, tmp_io_addr + 0x02);
215 * Scsi ID -- general purpose register, hi
216 * 2 bits; add 4 to this number to get the
220 esp->scsi_id = ((pos[2] & 0xC0) >> 6) + 4;
222 /* Do command transfer with programmed I/O */
224 esp->do_pio_cmds = 1;
226 /* Required functions */
228 esp->dma_bytes_sent = &dma_bytes_sent;
229 esp->dma_can_transfer = &dma_can_transfer;
230 esp->dma_dump_state = &dma_dump_state;
231 esp->dma_init_read = &dma_init_read;
232 esp->dma_init_write = &dma_init_write;
233 esp->dma_ints_off = &dma_ints_off;
234 esp->dma_ints_on = &dma_ints_on;
235 esp->dma_irq_p = &dma_irq_p;
236 esp->dma_ports_p = &dma_ports_p;
237 esp->dma_setup = &dma_setup;
239 /* Optional functions */
241 esp->dma_barrier = NULL;
242 esp->dma_drain = NULL;
243 esp->dma_invalidate = NULL;
244 esp->dma_irq_entry = NULL;
245 esp->dma_irq_exit = NULL;
246 esp->dma_led_on = dma_led_on;
247 esp->dma_led_off = dma_led_off;
248 esp->dma_poll = NULL;
249 esp->dma_reset = NULL;
251 /* Set the command buffer */
253 esp->esp_command = (volatile unsigned char*)
255 esp->esp_command_dvma = isa_virt_to_bus(cmd_buffer);
257 /* SCSI chip speed */
259 esp->cfreq = 25000000;
261 /* Differential SCSI? I think not. */
267 printk(" Adapter found in slot %2d: io port 0x%x "
268 "irq %d dma channel %d\n", slot + 1, tmp_io_addr,
271 mca_set_adapter_name(slot, "NCR 53C9X SCSI Adapter");
272 mca_mark_as_used(slot);
284 /******************************************************************* Release */
286 static int mca_esp_release(struct Scsi_Host *host)
288 struct NCR_ESP *esp = (struct NCR_ESP *)host->hostdata;
289 unsigned char tmp_byte;
293 * Tell the 86C01 to stop sending interrupts
296 tmp_byte = inb(esp->eregs->io_addr - 0x0E);
298 outb(tmp_byte, esp->eregs->io_addr - 0x0E);
300 free_irq(esp->irq, esp_intr);
303 mca_mark_as_unused(esp->slot);
308 /************************************************************* DMA Functions */
309 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
311 /* Ask the 53c9x. It knows. */
316 static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp)
319 * The MCA dma channels can only do up to 128K bytes at a time.
323 unsigned long sz = sp->SCp.this_residual;
329 static void dma_dump_state(struct NCR_ESP *esp)
332 * Doesn't quite match up to the other drivers, but we do what we
336 ESPLOG(("esp%d: dma channel <%d>\n", esp->esp_id, esp->dma));
337 ESPLOG(("bytes left to dma: %d\n", mca_get_dma_residue(esp->dma)));
340 static void dma_init_read(struct NCR_ESP *esp, __u32 addr, int length)
348 mca_disable_dma(esp->dma);
349 mca_set_dma_mode(esp->dma, MCA_DMA_MODE_XFER | MCA_DMA_MODE_16 |
351 mca_set_dma_addr(esp->dma, addr);
352 mca_set_dma_count(esp->dma, length / 2); /* !!! */
353 mca_enable_dma(esp->dma);
355 restore_flags(flags);
358 static void dma_init_write(struct NCR_ESP *esp, __u32 addr, int length)
366 mca_disable_dma(esp->dma);
367 mca_set_dma_mode(esp->dma, MCA_DMA_MODE_XFER | MCA_DMA_MODE_WRITE |
368 MCA_DMA_MODE_16 | MCA_DMA_MODE_IO);
369 mca_set_dma_addr(esp->dma, addr);
370 mca_set_dma_count(esp->dma, length / 2); /* !!! */
371 mca_enable_dma(esp->dma);
373 restore_flags(flags);
376 static void dma_ints_off(struct NCR_ESP *esp)
379 * Tell the 'C01 to shut up. All interrupts are routed through it.
382 outb(inb(esp->eregs->io_addr - 0x0E) & ~0x40,
383 esp->eregs->io_addr - 0x0E);
386 static void dma_ints_on(struct NCR_ESP *esp)
389 * Ok. You can speak again.
392 outb(inb(esp->eregs->io_addr - 0x0E) | 0x40,
393 esp->eregs->io_addr - 0x0E);
396 static int dma_irq_p(struct NCR_ESP *esp)
399 * DaveM says that this should return a "yes" if there is an interrupt
400 * or a DMA error occurred. I copied the Amiga driver's semantics,
401 * though, because it seems to work and we can't really tell if
402 * a DMA error happened. This gives the "yes" if the scsi chip
403 * is sending an interrupt and no DMA activity is taking place
406 return (!(inb(esp->eregs->io_addr - 0x04) & 1) &&
407 !(inb(esp->eregs->io_addr - 0x04) & 2) );
410 static int dma_ports_p(struct NCR_ESP *esp)
413 * Check to see if interrupts are enabled on the 'C01 (in case abort
414 * is entered multiple times, so we only do the abort once)
417 return (inb(esp->eregs->io_addr - 0x0E) & 0x40) ? 1:0;
420 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write)
423 dma_init_write(esp, addr, count);
425 dma_init_read(esp, addr, count);
430 * These will not play nicely with other disk controllers that try to use the
431 * disk active LED... but what can you do? Don't answer that.
433 * Stolen shamelessly from ibmmca.c -- IBM Microchannel SCSI adapter driver
437 static void dma_led_on(struct NCR_ESP *esp)
439 outb(inb(PS2_SYS_CTR) | 0xc0, PS2_SYS_CTR);
442 static void dma_led_off(struct NCR_ESP *esp)
444 outb(inb(PS2_SYS_CTR) & 0x3f, PS2_SYS_CTR);
447 static struct scsi_host_template driver_template = {
448 .proc_name = "mca_53c9x",
449 .name = "NCR 53c9x SCSI",
450 .detect = mca_esp_detect,
451 .slave_alloc = esp_slave_alloc,
452 .slave_destroy = esp_slave_destroy,
453 .release = mca_esp_release,
454 .queuecommand = esp_queue,
455 .eh_abort_handler = esp_abort,
456 .eh_bus_reset_handler = esp_reset,
458 .sg_tablesize = SG_ALL,
460 .unchecked_isa_dma = 1,
461 .use_clustering = DISABLE_CLUSTERING
465 #include "scsi_module.c"
468 * OK, here's the goods I promised. The NCR 86C01 is an MCA interface chip
469 * that handles enabling/diabling IRQ, dma interfacing, IO port selection
470 * and other fun stuff. It takes up 16 addresses, and the chip it is
471 * connnected to gets the following 16. Registers are as follows:
473 * Offsets 0-1 : Card ID
475 * Offset 2 : Mode enable register --
476 * Bit 7 : Data Word width (1 = 16, 0 = 8)
477 * Bit 6 : IRQ enable (1 = enabled)
478 * Bits 5,4 : IRQ select
483 * Bits 3-1 : Base Address
492 * Bit 0 : Card enable (1 = enabled)
494 * Offset 3 : DMA control register --
495 * Bit 7 : DMA enable (1 = enabled)
496 * Bits 6,5 : Preemt Count Select (transfers to complete after
497 * 'C01 has been preempted on MCA bus)
502 * (all these wacky numbers; I'm sure there's a reason somewhere)
503 * Bit 4 : Fairness enable (1 = fair bus priority)
504 * Bits 3-0 : Arbitration level (0-15 consecutive)
506 * Offset 4 : General purpose register
507 * Bits 7-3 : User definable (here, 7,6 are SCSI ID)
508 * Bits 2-0 : reserved
510 * Offset 10 : DMA decode register (used for IO based DMA; also can do
511 * PIO through this port)
514 * Bits 7-2 : reserved
515 * Bit 1 : DMA pending (1 = pending)
516 * Bit 0 : IRQ pending (0 = pending)