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/ioport.h>
24 #include <linux/init.h>
25 #include <linux/blkdev.h>
28 #include <asm/system.h>
30 #include <asm/sun3ints.h>
32 #include <asm/idprom.h>
33 #include <asm/machines.h>
37 #undef SUN3_SCSI_DEBUG
44 #include <scsi/scsi_host.h>
45 #include "sun3_scsi.h"
47 extern int sun3_map_test(unsigned long, char *);
50 /*#define RESET_BOOT */
56 * BUG can be used to trigger a strange code-size related hang on 2.1 kernels
63 /* #define SUPPORT_TAGS */
65 //#define ENABLE_IRQ() enable_irq( SUN3_VEC_VMESCSI0 );
69 static irqreturn_t scsi_sun3_intr(int irq, void *dummy);
70 static inline unsigned char sun3scsi_read(int reg);
71 static inline void sun3scsi_write(int reg, int value);
73 static int setup_can_queue = -1;
74 module_param(setup_can_queue, int, 0);
75 static int setup_cmd_per_lun = -1;
76 module_param(setup_cmd_per_lun, int, 0);
77 static int setup_sg_tablesize = -1;
78 module_param(setup_sg_tablesize, int, 0);
80 static int setup_use_tagged_queuing = -1;
81 module_param(setup_use_tagged_queuing, int, 0);
83 static int setup_hostid = -1;
84 module_param(setup_hostid, int, 0);
86 static struct scsi_cmnd *sun3_dma_setup_done = NULL;
88 #define AFTER_RESET_DELAY (HZ/2)
90 /* ms to wait after hitting dma regs */
91 #define SUN3_DMA_DELAY 10
93 /* dvma buffer to allocate -- 32k should hopefully be more than sufficient */
94 #define SUN3_DVMA_BUFSIZE 0xe000
96 /* minimum number of bytes to do dma on */
97 #define SUN3_DMA_MINSIZE 128
99 static volatile unsigned char *sun3_scsi_regp;
100 static volatile struct sun3_dma_regs *dregs;
102 static unsigned char *dmabuf = NULL; /* dma memory buffer */
104 static unsigned char *sun3_dma_orig_addr = NULL;
105 static unsigned long sun3_dma_orig_count = 0;
106 static int sun3_dma_active = 0;
107 static unsigned long last_residual = 0;
110 * NCR 5380 register access functions
113 static inline unsigned char sun3scsi_read(int reg)
115 return( sun3_scsi_regp[reg] );
118 static inline void sun3scsi_write(int reg, int value)
120 sun3_scsi_regp[reg] = value;
126 static struct Scsi_Host *default_instance;
129 * Function : int sun3scsi_detect(struct scsi_host_template * tpnt)
131 * Purpose : initializes mac NCR5380 driver based on the
132 * command line / compile time port and irq definitions.
134 * Inputs : tpnt - template for this SCSI adapter.
136 * Returns : 1 if a host adapter was found, 0 if not.
140 static int sun3scsi_detect(struct scsi_host_template * tpnt)
142 unsigned long ioaddr, irq = 0;
143 static int called = 0;
144 struct Scsi_Host *instance;
146 unsigned long addrs[3] = { IOBASE_SUN3_VMESCSI,
147 IOBASE_SUN3_VMESCSI + 0x4000,
149 unsigned long vecs[3] = { SUN3_VEC_VMESCSI0,
152 /* check that this machine has an onboard 5380 */
153 switch(idprom->id_machtype) {
154 case SM_SUN3|SM_3_160:
155 case SM_SUN3|SM_3_260:
165 tpnt->proc_name = "Sun3 5380 VME SCSI";
167 /* setup variables */
169 (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
171 (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
173 (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
175 if (setup_hostid >= 0)
176 tpnt->this_id = setup_hostid;
178 /* use 7 as default */
183 for(i = 0; addrs[i] != 0; i++) {
186 ioaddr = (unsigned long)sun3_ioremap(addrs[i], PAGE_SIZE,
187 SUN3_PAGE_TYPE_VME16);
189 sun3_scsi_regp = (unsigned char *)ioaddr;
191 dregs = (struct sun3_dma_regs *)(((unsigned char *)ioaddr) + 8);
193 if(sun3_map_test((unsigned long)dregs, &x)) {
194 unsigned short oldcsr;
198 udelay(SUN3_DMA_DELAY);
199 if(dregs->csr == 0x1400)
205 iounmap((void *)ioaddr);
213 if (setup_use_tagged_queuing < 0)
214 setup_use_tagged_queuing = USE_TAGGED_QUEUING;
217 instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
221 default_instance = instance;
223 instance->io_port = (unsigned long) ioaddr;
226 NCR5380_init(instance, 0);
228 instance->n_io_port = 32;
230 ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
232 if (request_irq(instance->irq, scsi_sun3_intr,
233 0, "Sun3SCSI-5380VME", NULL)) {
235 printk("scsi%d: IRQ%d not free, interrupts disabled\n",
236 instance->host_no, instance->irq);
237 instance->irq = SCSI_IRQ_NONE;
239 printk("scsi%d: IRQ%d not free, bailing out\n",
240 instance->host_no, instance->irq);
245 printk("scsi%d: Sun3 5380 VME at port %lX irq", instance->host_no, instance->io_port);
246 if (instance->irq == SCSI_IRQ_NONE)
247 printk ("s disabled");
249 printk (" %d", instance->irq);
250 printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
251 instance->can_queue, instance->cmd_per_lun,
252 SUN3SCSI_PUBLIC_RELEASE);
253 printk("\nscsi%d:", instance->host_no);
254 NCR5380_print_options(instance);
258 udelay(SUN3_DMA_DELAY);
259 dregs->csr = CSR_SCSI | CSR_FIFO | CSR_INTR;
260 udelay(SUN3_DMA_DELAY);
261 dregs->fifo_count = 0;
262 dregs->fifo_count_hi = 0;
263 dregs->dma_addr_hi = 0;
264 dregs->dma_addr_lo = 0;
265 dregs->dma_count_hi = 0;
266 dregs->dma_count_lo = 0;
268 dregs->ivect = VME_DATA24 | (instance->irq & 0xff);
273 sun3_scsi_reset_boot(instance);
279 int sun3scsi_release (struct Scsi_Host *shpnt)
281 if (shpnt->irq != SCSI_IRQ_NONE)
282 free_irq (shpnt->irq, NULL);
284 iounmap((void *)sun3_scsi_regp);
291 * Our 'bus reset on boot' function
294 static void sun3_scsi_reset_boot(struct Scsi_Host *instance)
298 NCR5380_local_declare();
299 NCR5380_setup(instance);
302 * Do a SCSI reset to clean up the bus during initialization. No
303 * messing with the queues, interrupts, or locks necessary here.
306 printk( "Sun3 SCSI: resetting the SCSI bus..." );
308 /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
309 // sun3_disable_irq( IRQ_SUN3_SCSI );
312 NCR5380_write( TARGET_COMMAND_REG,
313 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
316 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
318 /* The min. reset hold time is 25us, so 40us should be enough */
321 /* reset RST and interrupt */
322 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
323 NCR5380_read( RESET_PARITY_INTERRUPT_REG );
325 for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
328 /* switch on SCSI IRQ again */
329 // sun3_enable_irq( IRQ_SUN3_SCSI );
335 static const char * sun3scsi_info (struct Scsi_Host *spnt) {
339 // safe bits for the CSR
340 #define CSR_GOOD 0x060f
342 static irqreturn_t scsi_sun3_intr(int irq, void *dummy)
344 unsigned short csr = dregs->csr;
347 dregs->csr &= ~CSR_DMA_ENABLE;
350 #ifdef SUN3_SCSI_DEBUG
351 printk("scsi_intr csr %x\n", csr);
354 if(csr & ~CSR_GOOD) {
355 if(csr & CSR_DMA_BUSERR) {
356 printk("scsi%d: bus error in dma\n", default_instance->host_no);
357 #ifdef SUN3_SCSI_DEBUG
358 printk("scsi: residual %x count %x addr %p dmaaddr %x\n",
360 dregs->dma_count_lo | (dregs->dma_count_hi << 16),
362 dregs->dma_addr_lo | (dregs->dma_addr_hi << 16));
366 if(csr & CSR_DMA_CONFLICT) {
367 printk("scsi%d: dma conflict\n", default_instance->host_no);
372 if(csr & (CSR_SDB_INT | CSR_DMA_INT)) {
373 NCR5380_intr(irq, dummy);
377 return IRQ_RETVAL(handled);
381 * Debug stuff - to be called on NMI, or sysrq key. Use at your own risk;
382 * reentering NCR5380_print_status seems to have ugly side effects
385 /* this doesn't seem to get used at all -- sam */
387 void sun3_sun3_debug (void)
390 NCR5380_local_declare();
392 if (default_instance) {
393 local_irq_save(flags);
394 NCR5380_print_status(default_instance);
395 local_irq_restore(flags);
401 /* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */
402 static unsigned long sun3scsi_dma_setup(void *data, unsigned long count, int write_flag)
406 if(sun3_dma_orig_addr != NULL)
407 dvma_unmap(sun3_dma_orig_addr);
409 // addr = sun3_dvma_page((unsigned long)data, (unsigned long)dmabuf);
410 addr = (void *)dvma_map_vme((unsigned long) data, count);
412 sun3_dma_orig_addr = addr;
413 sun3_dma_orig_count = count;
415 #ifdef SUN3_SCSI_DEBUG
416 printk("scsi: dma_setup addr %p count %x\n", addr, count);
419 // dregs->fifo_count = 0;
422 dregs->csr &= ~CSR_FIFO;
423 dregs->csr |= CSR_FIFO;
427 dregs->csr |= CSR_SEND;
429 dregs->csr &= ~CSR_SEND;
432 // dregs->csr &= ~CSR_FIFO;
433 // dregs->csr |= CSR_FIFO;
435 dregs->csr |= CSR_PACK_ENABLE;
437 dregs->dma_addr_hi = ((unsigned long)addr >> 16);
438 dregs->dma_addr_lo = ((unsigned long)addr & 0xffff);
440 dregs->dma_count_hi = 0;
441 dregs->dma_count_lo = 0;
442 dregs->fifo_count_hi = 0;
443 dregs->fifo_count = 0;
445 #ifdef SUN3_SCSI_DEBUG
446 printk("scsi: dma_setup done csr %x\n", dregs->csr);
452 static inline unsigned long sun3scsi_dma_residual(struct Scsi_Host *instance)
454 return last_residual;
457 static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted,
458 struct scsi_cmnd *cmd,
461 if(blk_fs_request(cmd->request))
467 static int sun3scsi_dma_start(unsigned long count, char *data)
473 #ifdef SUN3_SCSI_DEBUG
474 printk("scsi: dma_start data %p count %x csr %x fifo %x\n", data, count, csr, dregs->fifo_count);
477 dregs->dma_count_hi = (sun3_dma_orig_count >> 16);
478 dregs->dma_count_lo = (sun3_dma_orig_count & 0xffff);
480 dregs->fifo_count_hi = (sun3_dma_orig_count >> 16);
481 dregs->fifo_count = (sun3_dma_orig_count & 0xffff);
483 // if(!(csr & CSR_DMA_ENABLE))
484 // dregs->csr |= CSR_DMA_ENABLE;
489 /* clean up after our dma is done */
490 static int sun3scsi_dma_finish(int write_flag)
497 dregs->csr &= ~CSR_DMA_ENABLE;
499 fifo = dregs->fifo_count;
501 if((fifo > 0) && (fifo < sun3_dma_orig_count))
505 last_residual = fifo;
506 #ifdef SUN3_SCSI_DEBUG
507 printk("scsi: residual %x total %x\n", fifo, sun3_dma_orig_count);
509 /* empty bytes from the fifo which didn't make it */
510 if((!write_flag) && (dregs->csr & CSR_LEFT)) {
511 unsigned char *vaddr;
513 #ifdef SUN3_SCSI_DEBUG
514 printk("scsi: got left over bytes\n");
517 vaddr = (unsigned char *)dvma_vmetov(sun3_dma_orig_addr);
519 vaddr += (sun3_dma_orig_count - fifo);
522 switch(dregs->csr & CSR_LEFT) {
524 *vaddr = (dregs->bpack_lo & 0xff00) >> 8;
528 *vaddr = (dregs->bpack_hi & 0x00ff);
532 *vaddr = (dregs->bpack_hi & 0xff00) >> 8;
539 dvma_unmap(sun3_dma_orig_addr);
540 sun3_dma_orig_addr = NULL;
542 dregs->dma_addr_hi = 0;
543 dregs->dma_addr_lo = 0;
544 dregs->dma_count_hi = 0;
545 dregs->dma_count_lo = 0;
547 dregs->fifo_count = 0;
548 dregs->fifo_count_hi = 0;
550 dregs->csr &= ~CSR_SEND;
552 // dregs->csr |= CSR_DMA_ENABLE;
556 dregs->csr &= ~CSR_FIFO;
557 dregs->csr |= CSR_FIFO;
559 sun3_dma_setup_done = NULL;
565 #include "sun3_NCR5380.c"
567 static struct scsi_host_template driver_template = {
568 .name = SUN3_SCSI_NAME,
569 .detect = sun3scsi_detect,
570 .release = sun3scsi_release,
571 .info = sun3scsi_info,
572 .queuecommand = sun3scsi_queue_command,
573 .eh_abort_handler = sun3scsi_abort,
574 .eh_bus_reset_handler = sun3scsi_bus_reset,
575 .can_queue = CAN_QUEUE,
577 .sg_tablesize = SG_TABLESIZE,
578 .cmd_per_lun = CMD_PER_LUN,
579 .use_clustering = DISABLE_CLUSTERING
583 #include "scsi_module.c"