2 * Sun3 SCSI stuff by Erik Verbruggen (erik@bigmama.xtdnet.nl)
4 * Sun3 DMA routines added by Sam Creasey (sammy@sammy.net)
6 * VME support added by Sam Creasey
8 * Adapted from sun3_scsi.c -- see there for other headers
10 * TODO: modify this driver to support multiple Sun3 SCSI VME boards
16 #include <linux/types.h>
17 #include <linux/stddef.h>
18 #include <linux/ctype.h>
19 #include <linux/delay.h>
21 #include <linux/module.h>
22 #include <linux/signal.h>
23 #include <linux/sched.h>
24 #include <linux/ioport.h>
25 #include <linux/init.h>
26 #include <linux/blkdev.h>
29 #include <asm/system.h>
31 #include <asm/sun3ints.h>
33 #include <asm/idprom.h>
34 #include <asm/machines.h>
38 #undef SUN3_SCSI_DEBUG
45 #include <scsi/scsi_host.h>
46 #include "sun3_scsi.h"
48 extern int sun3_map_test(unsigned long, char *);
51 /*#define RESET_BOOT */
57 * BUG can be used to trigger a strange code-size related hang on 2.1 kernels
64 /* #define SUPPORT_TAGS */
66 //#define ENABLE_IRQ() enable_irq( SUN3_VEC_VMESCSI0 );
70 static irqreturn_t scsi_sun3_intr(int irq, void *dummy);
71 static inline unsigned char sun3scsi_read(int reg);
72 static inline void sun3scsi_write(int reg, int value);
74 static int setup_can_queue = -1;
75 module_param(setup_can_queue, int, 0);
76 static int setup_cmd_per_lun = -1;
77 module_param(setup_cmd_per_lun, int, 0);
78 static int setup_sg_tablesize = -1;
79 module_param(setup_sg_tablesize, int, 0);
81 static int setup_use_tagged_queuing = -1;
82 module_param(setup_use_tagged_queuing, int, 0);
84 static int setup_hostid = -1;
85 module_param(setup_hostid, int, 0);
87 static struct scsi_cmnd *sun3_dma_setup_done = NULL;
89 #define AFTER_RESET_DELAY (HZ/2)
91 /* ms to wait after hitting dma regs */
92 #define SUN3_DMA_DELAY 10
94 /* dvma buffer to allocate -- 32k should hopefully be more than sufficient */
95 #define SUN3_DVMA_BUFSIZE 0xe000
97 /* minimum number of bytes to do dma on */
98 #define SUN3_DMA_MINSIZE 128
100 static volatile unsigned char *sun3_scsi_regp;
101 static volatile struct sun3_dma_regs *dregs;
103 static unsigned char *dmabuf = NULL; /* dma memory buffer */
105 static unsigned char *sun3_dma_orig_addr = NULL;
106 static unsigned long sun3_dma_orig_count = 0;
107 static int sun3_dma_active = 0;
108 static unsigned long last_residual = 0;
111 * NCR 5380 register access functions
114 static inline unsigned char sun3scsi_read(int reg)
116 return( sun3_scsi_regp[reg] );
119 static inline void sun3scsi_write(int reg, int value)
121 sun3_scsi_regp[reg] = value;
127 static struct Scsi_Host *default_instance;
130 * Function : int sun3scsi_detect(struct scsi_host_template * tpnt)
132 * Purpose : initializes mac NCR5380 driver based on the
133 * command line / compile time port and irq definitions.
135 * Inputs : tpnt - template for this SCSI adapter.
137 * Returns : 1 if a host adapter was found, 0 if not.
141 static int sun3scsi_detect(struct scsi_host_template * tpnt)
143 unsigned long ioaddr, irq = 0;
144 static int called = 0;
145 struct Scsi_Host *instance;
147 unsigned long addrs[3] = { IOBASE_SUN3_VMESCSI,
148 IOBASE_SUN3_VMESCSI + 0x4000,
150 unsigned long vecs[3] = { SUN3_VEC_VMESCSI0,
153 /* check that this machine has an onboard 5380 */
154 switch(idprom->id_machtype) {
155 case SM_SUN3|SM_3_160:
156 case SM_SUN3|SM_3_260:
166 tpnt->proc_name = "Sun3 5380 VME SCSI";
168 /* setup variables */
170 (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
172 (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
174 (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
176 if (setup_hostid >= 0)
177 tpnt->this_id = setup_hostid;
179 /* use 7 as default */
184 for(i = 0; addrs[i] != 0; i++) {
187 ioaddr = (unsigned long)sun3_ioremap(addrs[i], PAGE_SIZE,
188 SUN3_PAGE_TYPE_VME16);
190 sun3_scsi_regp = (unsigned char *)ioaddr;
192 dregs = (struct sun3_dma_regs *)(((unsigned char *)ioaddr) + 8);
194 if(sun3_map_test((unsigned long)dregs, &x)) {
195 unsigned short oldcsr;
199 udelay(SUN3_DMA_DELAY);
200 if(dregs->csr == 0x1400)
206 iounmap((void *)ioaddr);
214 if (setup_use_tagged_queuing < 0)
215 setup_use_tagged_queuing = USE_TAGGED_QUEUING;
218 instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
222 default_instance = instance;
224 instance->io_port = (unsigned long) ioaddr;
227 NCR5380_init(instance, 0);
229 instance->n_io_port = 32;
231 ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
233 if (request_irq(instance->irq, scsi_sun3_intr,
234 0, "Sun3SCSI-5380VME", NULL)) {
236 printk("scsi%d: IRQ%d not free, interrupts disabled\n",
237 instance->host_no, instance->irq);
238 instance->irq = SCSI_IRQ_NONE;
240 printk("scsi%d: IRQ%d not free, bailing out\n",
241 instance->host_no, instance->irq);
246 printk("scsi%d: Sun3 5380 VME at port %lX irq", instance->host_no, instance->io_port);
247 if (instance->irq == SCSI_IRQ_NONE)
248 printk ("s disabled");
250 printk (" %d", instance->irq);
251 printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
252 instance->can_queue, instance->cmd_per_lun,
253 SUN3SCSI_PUBLIC_RELEASE);
254 printk("\nscsi%d:", instance->host_no);
255 NCR5380_print_options(instance);
259 udelay(SUN3_DMA_DELAY);
260 dregs->csr = CSR_SCSI | CSR_FIFO | CSR_INTR;
261 udelay(SUN3_DMA_DELAY);
262 dregs->fifo_count = 0;
263 dregs->fifo_count_hi = 0;
264 dregs->dma_addr_hi = 0;
265 dregs->dma_addr_lo = 0;
266 dregs->dma_count_hi = 0;
267 dregs->dma_count_lo = 0;
269 dregs->ivect = VME_DATA24 | (instance->irq & 0xff);
274 sun3_scsi_reset_boot(instance);
280 int sun3scsi_release (struct Scsi_Host *shpnt)
282 if (shpnt->irq != SCSI_IRQ_NONE)
283 free_irq (shpnt->irq, NULL);
285 iounmap((void *)sun3_scsi_regp);
292 * Our 'bus reset on boot' function
295 static void sun3_scsi_reset_boot(struct Scsi_Host *instance)
299 NCR5380_local_declare();
300 NCR5380_setup(instance);
303 * Do a SCSI reset to clean up the bus during initialization. No
304 * messing with the queues, interrupts, or locks necessary here.
307 printk( "Sun3 SCSI: resetting the SCSI bus..." );
309 /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
310 // sun3_disable_irq( IRQ_SUN3_SCSI );
313 NCR5380_write( TARGET_COMMAND_REG,
314 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
317 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
319 /* The min. reset hold time is 25us, so 40us should be enough */
322 /* reset RST and interrupt */
323 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
324 NCR5380_read( RESET_PARITY_INTERRUPT_REG );
326 for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
329 /* switch on SCSI IRQ again */
330 // sun3_enable_irq( IRQ_SUN3_SCSI );
336 static const char * sun3scsi_info (struct Scsi_Host *spnt) {
340 // safe bits for the CSR
341 #define CSR_GOOD 0x060f
343 static irqreturn_t scsi_sun3_intr(int irq, void *dummy)
345 unsigned short csr = dregs->csr;
348 dregs->csr &= ~CSR_DMA_ENABLE;
351 #ifdef SUN3_SCSI_DEBUG
352 printk("scsi_intr csr %x\n", csr);
355 if(csr & ~CSR_GOOD) {
356 if(csr & CSR_DMA_BUSERR) {
357 printk("scsi%d: bus error in dma\n", default_instance->host_no);
358 #ifdef SUN3_SCSI_DEBUG
359 printk("scsi: residual %x count %x addr %p dmaaddr %x\n",
361 dregs->dma_count_lo | (dregs->dma_count_hi << 16),
363 dregs->dma_addr_lo | (dregs->dma_addr_hi << 16));
367 if(csr & CSR_DMA_CONFLICT) {
368 printk("scsi%d: dma conflict\n", default_instance->host_no);
373 if(csr & (CSR_SDB_INT | CSR_DMA_INT)) {
374 NCR5380_intr(irq, dummy);
378 return IRQ_RETVAL(handled);
382 * Debug stuff - to be called on NMI, or sysrq key. Use at your own risk;
383 * reentering NCR5380_print_status seems to have ugly side effects
386 /* this doesn't seem to get used at all -- sam */
388 void sun3_sun3_debug (void)
391 NCR5380_local_declare();
393 if (default_instance) {
394 local_irq_save(flags);
395 NCR5380_print_status(default_instance);
396 local_irq_restore(flags);
402 /* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */
403 static unsigned long sun3scsi_dma_setup(void *data, unsigned long count, int write_flag)
407 if(sun3_dma_orig_addr != NULL)
408 dvma_unmap(sun3_dma_orig_addr);
410 // addr = sun3_dvma_page((unsigned long)data, (unsigned long)dmabuf);
411 addr = (void *)dvma_map_vme((unsigned long) data, count);
413 sun3_dma_orig_addr = addr;
414 sun3_dma_orig_count = count;
416 #ifdef SUN3_SCSI_DEBUG
417 printk("scsi: dma_setup addr %p count %x\n", addr, count);
420 // dregs->fifo_count = 0;
423 dregs->csr &= ~CSR_FIFO;
424 dregs->csr |= CSR_FIFO;
428 dregs->csr |= CSR_SEND;
430 dregs->csr &= ~CSR_SEND;
433 // dregs->csr &= ~CSR_FIFO;
434 // dregs->csr |= CSR_FIFO;
436 dregs->csr |= CSR_PACK_ENABLE;
438 dregs->dma_addr_hi = ((unsigned long)addr >> 16);
439 dregs->dma_addr_lo = ((unsigned long)addr & 0xffff);
441 dregs->dma_count_hi = 0;
442 dregs->dma_count_lo = 0;
443 dregs->fifo_count_hi = 0;
444 dregs->fifo_count = 0;
446 #ifdef SUN3_SCSI_DEBUG
447 printk("scsi: dma_setup done csr %x\n", dregs->csr);
453 static inline unsigned long sun3scsi_dma_residual(struct Scsi_Host *instance)
455 return last_residual;
458 static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted,
459 struct scsi_cmnd *cmd,
462 if(blk_fs_request(cmd->request))
468 static int sun3scsi_dma_start(unsigned long count, char *data)
474 #ifdef SUN3_SCSI_DEBUG
475 printk("scsi: dma_start data %p count %x csr %x fifo %x\n", data, count, csr, dregs->fifo_count);
478 dregs->dma_count_hi = (sun3_dma_orig_count >> 16);
479 dregs->dma_count_lo = (sun3_dma_orig_count & 0xffff);
481 dregs->fifo_count_hi = (sun3_dma_orig_count >> 16);
482 dregs->fifo_count = (sun3_dma_orig_count & 0xffff);
484 // if(!(csr & CSR_DMA_ENABLE))
485 // dregs->csr |= CSR_DMA_ENABLE;
490 /* clean up after our dma is done */
491 static int sun3scsi_dma_finish(int write_flag)
498 dregs->csr &= ~CSR_DMA_ENABLE;
500 fifo = dregs->fifo_count;
502 if((fifo > 0) && (fifo < sun3_dma_orig_count))
506 last_residual = fifo;
507 #ifdef SUN3_SCSI_DEBUG
508 printk("scsi: residual %x total %x\n", fifo, sun3_dma_orig_count);
510 /* empty bytes from the fifo which didn't make it */
511 if((!write_flag) && (dregs->csr & CSR_LEFT)) {
512 unsigned char *vaddr;
514 #ifdef SUN3_SCSI_DEBUG
515 printk("scsi: got left over bytes\n");
518 vaddr = (unsigned char *)dvma_vmetov(sun3_dma_orig_addr);
520 vaddr += (sun3_dma_orig_count - fifo);
523 switch(dregs->csr & CSR_LEFT) {
525 *vaddr = (dregs->bpack_lo & 0xff00) >> 8;
529 *vaddr = (dregs->bpack_hi & 0x00ff);
533 *vaddr = (dregs->bpack_hi & 0xff00) >> 8;
540 dvma_unmap(sun3_dma_orig_addr);
541 sun3_dma_orig_addr = NULL;
543 dregs->dma_addr_hi = 0;
544 dregs->dma_addr_lo = 0;
545 dregs->dma_count_hi = 0;
546 dregs->dma_count_lo = 0;
548 dregs->fifo_count = 0;
549 dregs->fifo_count_hi = 0;
551 dregs->csr &= ~CSR_SEND;
553 // dregs->csr |= CSR_DMA_ENABLE;
557 dregs->csr &= ~CSR_FIFO;
558 dregs->csr |= CSR_FIFO;
560 sun3_dma_setup_done = NULL;
566 #include "sun3_NCR5380.c"
568 static struct scsi_host_template driver_template = {
569 .name = SUN3_SCSI_NAME,
570 .detect = sun3scsi_detect,
571 .release = sun3scsi_release,
572 .info = sun3scsi_info,
573 .queuecommand = sun3scsi_queue_command,
574 .eh_abort_handler = sun3scsi_abort,
575 .eh_bus_reset_handler = sun3scsi_bus_reset,
576 .can_queue = CAN_QUEUE,
578 .sg_tablesize = SG_TABLESIZE,
579 .cmd_per_lun = CMD_PER_LUN,
580 .use_clustering = DISABLE_CLUSTERING
584 #include "scsi_module.c"