/* * Sun3 SCSI stuff by Erik Verbruggen (erik@bigmama.xtdnet.nl) * * Sun3 DMA routines added by Sam Creasey (sammy@sammy.net) * * VME support added by Sam Creasey * * TODO: modify this driver to support multiple Sun3 SCSI VME boards * * Adapted from mac_scsinew.c: */ /* * Generic Macintosh NCR5380 driver * * Copyright 1998, Michael Schmitz * * derived in part from: */ /* * Generic Generic NCR5380 driver * * Copyright 1995, Russell King */ #include #include #include #include #include #include #include #include #include #include #include "sun3_scsi.h" /* Definitions for the core NCR5380 driver. */ #define REAL_DMA /* #define SUPPORT_TAGS */ /* minimum number of bytes to do dma on */ #define DMA_MIN_SIZE 129 /* #define MAX_TAGS 32 */ #define NCR5380_implementation_fields /* none */ #define NCR5380_read(reg) sun3scsi_read(reg) #define NCR5380_write(reg, value) sun3scsi_write(reg, value) #define NCR5380_queue_command sun3scsi_queue_command #define NCR5380_bus_reset sun3scsi_bus_reset #define NCR5380_abort sun3scsi_abort #define NCR5380_show_info sun3scsi_show_info #define NCR5380_info sun3scsi_info #define NCR5380_dma_read_setup(instance, data, count) \ sun3scsi_dma_setup(data, count, 0) #define NCR5380_dma_write_setup(instance, data, count) \ sun3scsi_dma_setup(data, count, 1) #define NCR5380_dma_residual(instance) \ sun3scsi_dma_residual(instance) #define NCR5380_dma_xfer_len(instance, cmd, phase) \ sun3scsi_dma_xfer_len(cmd->SCp.this_residual, cmd, !((phase) & SR_IO)) #define NCR5380_acquire_dma_irq(instance) (1) #define NCR5380_release_dma_irq(instance) #include "NCR5380.h" extern int sun3_map_test(unsigned long, char *); static int setup_can_queue = -1; module_param(setup_can_queue, int, 0); static int setup_cmd_per_lun = -1; module_param(setup_cmd_per_lun, int, 0); static int setup_sg_tablesize = -1; module_param(setup_sg_tablesize, int, 0); #ifdef SUPPORT_TAGS static int setup_use_tagged_queuing = -1; module_param(setup_use_tagged_queuing, int, 0); #endif static int setup_hostid = -1; module_param(setup_hostid, int, 0); /* #define RESET_BOOT */ #define AFTER_RESET_DELAY (HZ/2) /* ms to wait after hitting dma regs */ #define SUN3_DMA_DELAY 10 /* dvma buffer to allocate -- 32k should hopefully be more than sufficient */ #define SUN3_DVMA_BUFSIZE 0xe000 static struct scsi_cmnd *sun3_dma_setup_done; static unsigned char *sun3_scsi_regp; static volatile struct sun3_dma_regs *dregs; static struct sun3_udc_regs *udc_regs; static unsigned char *sun3_dma_orig_addr = NULL; static unsigned long sun3_dma_orig_count = 0; static int sun3_dma_active = 0; static unsigned long last_residual = 0; static struct Scsi_Host *default_instance; /* * NCR 5380 register access functions */ static inline unsigned char sun3scsi_read(int reg) { return in_8(sun3_scsi_regp + reg); } static inline void sun3scsi_write(int reg, int value) { out_8(sun3_scsi_regp + reg, value); } #ifndef SUN3_SCSI_VME /* dma controller register access functions */ static inline unsigned short sun3_udc_read(unsigned char reg) { unsigned short ret; dregs->udc_addr = UDC_CSR; udelay(SUN3_DMA_DELAY); ret = dregs->udc_data; udelay(SUN3_DMA_DELAY); return ret; } static inline void sun3_udc_write(unsigned short val, unsigned char reg) { dregs->udc_addr = reg; udelay(SUN3_DMA_DELAY); dregs->udc_data = val; udelay(SUN3_DMA_DELAY); } #endif #ifdef RESET_BOOT static void sun3_scsi_reset_boot(struct Scsi_Host *instance) { unsigned long end; /* * Do a SCSI reset to clean up the bus during initialization. No * messing with the queues, interrupts, or locks necessary here. */ printk( "Sun3 SCSI: resetting the SCSI bus..." ); /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */ // sun3_disable_irq( IRQ_SUN3_SCSI ); /* get in phase */ NCR5380_write( TARGET_COMMAND_REG, PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) )); /* assert RST */ NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST ); /* The min. reset hold time is 25us, so 40us should be enough */ udelay( 50 ); /* reset RST and interrupt */ NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE ); NCR5380_read( RESET_PARITY_INTERRUPT_REG ); for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); ) barrier(); /* switch on SCSI IRQ again */ // sun3_enable_irq( IRQ_SUN3_SCSI ); printk( " done\n" ); } #endif // safe bits for the CSR #define CSR_GOOD 0x060f static irqreturn_t scsi_sun3_intr(int irq, void *dummy) { unsigned short csr = dregs->csr; int handled = 0; #ifdef SUN3_SCSI_VME dregs->csr &= ~CSR_DMA_ENABLE; #endif if(csr & ~CSR_GOOD) { if(csr & CSR_DMA_BUSERR) { printk("scsi%d: bus error in dma\n", default_instance->host_no); } if(csr & CSR_DMA_CONFLICT) { printk("scsi%d: dma conflict\n", default_instance->host_no); } handled = 1; } if(csr & (CSR_SDB_INT | CSR_DMA_INT)) { NCR5380_intr(irq, dummy); handled = 1; } return IRQ_RETVAL(handled); } /* * Debug stuff - to be called on NMI, or sysrq key. Use at your own risk; * reentering NCR5380_print_status seems to have ugly side effects */ /* this doesn't seem to get used at all -- sam */ #if 0 void sun3_sun3_debug (void) { unsigned long flags; if (default_instance) { local_irq_save(flags); NCR5380_print_status(default_instance); local_irq_restore(flags); } } #endif /* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */ static unsigned long sun3scsi_dma_setup(void *data, unsigned long count, int write_flag) { void *addr; if(sun3_dma_orig_addr != NULL) dvma_unmap(sun3_dma_orig_addr); #ifdef SUN3_SCSI_VME addr = (void *)dvma_map_vme((unsigned long) data, count); #else addr = (void *)dvma_map((unsigned long) data, count); #endif sun3_dma_orig_addr = addr; sun3_dma_orig_count = count; #ifndef SUN3_SCSI_VME dregs->fifo_count = 0; sun3_udc_write(UDC_RESET, UDC_CSR); /* reset fifo */ dregs->csr &= ~CSR_FIFO; dregs->csr |= CSR_FIFO; #endif /* set direction */ if(write_flag) dregs->csr |= CSR_SEND; else dregs->csr &= ~CSR_SEND; #ifdef SUN3_SCSI_VME dregs->csr |= CSR_PACK_ENABLE; dregs->dma_addr_hi = ((unsigned long)addr >> 16); dregs->dma_addr_lo = ((unsigned long)addr & 0xffff); dregs->dma_count_hi = 0; dregs->dma_count_lo = 0; dregs->fifo_count_hi = 0; dregs->fifo_count = 0; #else /* byte count for fifo */ dregs->fifo_count = count; sun3_udc_write(UDC_RESET, UDC_CSR); /* reset fifo */ dregs->csr &= ~CSR_FIFO; dregs->csr |= CSR_FIFO; if(dregs->fifo_count != count) { printk("scsi%d: fifo_mismatch %04x not %04x\n", default_instance->host_no, dregs->fifo_count, (unsigned int) count); NCR5380_dprint(NDEBUG_DMA, default_instance); } /* setup udc */ udc_regs->addr_hi = (((unsigned long)(addr) & 0xff0000) >> 8); udc_regs->addr_lo = ((unsigned long)(addr) & 0xffff); udc_regs->count = count/2; /* count in words */ udc_regs->mode_hi = UDC_MODE_HIWORD; if(write_flag) { if(count & 1) udc_regs->count++; udc_regs->mode_lo = UDC_MODE_LSEND; udc_regs->rsel = UDC_RSEL_SEND; } else { udc_regs->mode_lo = UDC_MODE_LRECV; udc_regs->rsel = UDC_RSEL_RECV; } /* announce location of regs block */ sun3_udc_write(((dvma_vtob(udc_regs) & 0xff0000) >> 8), UDC_CHN_HI); sun3_udc_write((dvma_vtob(udc_regs) & 0xffff), UDC_CHN_LO); /* set dma master on */ sun3_udc_write(0xd, UDC_MODE); /* interrupt enable */ sun3_udc_write(UDC_INT_ENABLE, UDC_CSR); #endif return count; } #ifndef SUN3_SCSI_VME static inline unsigned long sun3scsi_dma_count(struct Scsi_Host *instance) { unsigned short resid; dregs->udc_addr = 0x32; udelay(SUN3_DMA_DELAY); resid = dregs->udc_data; udelay(SUN3_DMA_DELAY); resid *= 2; return (unsigned long) resid; } #endif static inline unsigned long sun3scsi_dma_residual(struct Scsi_Host *instance) { return last_residual; } static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted, struct scsi_cmnd *cmd, int write_flag) { if (cmd->request->cmd_type == REQ_TYPE_FS) return wanted; else return 0; } static inline int sun3scsi_dma_start(unsigned long count, unsigned char *data) { #ifdef SUN3_SCSI_VME unsigned short csr; csr = dregs->csr; dregs->dma_count_hi = (sun3_dma_orig_count >> 16); dregs->dma_count_lo = (sun3_dma_orig_count & 0xffff); dregs->fifo_count_hi = (sun3_dma_orig_count >> 16); dregs->fifo_count = (sun3_dma_orig_count & 0xffff); /* if(!(csr & CSR_DMA_ENABLE)) * dregs->csr |= CSR_DMA_ENABLE; */ #else sun3_udc_write(UDC_CHN_START, UDC_CSR); #endif return 0; } /* clean up after our dma is done */ static int sun3scsi_dma_finish(int write_flag) { unsigned short __maybe_unused count; unsigned short fifo; int ret = 0; sun3_dma_active = 0; #ifdef SUN3_SCSI_VME dregs->csr &= ~CSR_DMA_ENABLE; fifo = dregs->fifo_count; if (write_flag) { if ((fifo > 0) && (fifo < sun3_dma_orig_count)) fifo++; } last_residual = fifo; /* empty bytes from the fifo which didn't make it */ if ((!write_flag) && (dregs->csr & CSR_LEFT)) { unsigned char *vaddr; vaddr = (unsigned char *)dvma_vmetov(sun3_dma_orig_addr); vaddr += (sun3_dma_orig_count - fifo); vaddr--; switch (dregs->csr & CSR_LEFT) { case CSR_LEFT_3: *vaddr = (dregs->bpack_lo & 0xff00) >> 8; vaddr--; case CSR_LEFT_2: *vaddr = (dregs->bpack_hi & 0x00ff); vaddr--; case CSR_LEFT_1: *vaddr = (dregs->bpack_hi & 0xff00) >> 8; break; } } #else // check to empty the fifo on a read if(!write_flag) { int tmo = 20000; /* .2 sec */ while(1) { if(dregs->csr & CSR_FIFO_EMPTY) break; if(--tmo <= 0) { printk("sun3scsi: fifo failed to empty!\n"); return 1; } udelay(10); } } count = sun3scsi_dma_count(default_instance); fifo = dregs->fifo_count; last_residual = fifo; /* empty bytes from the fifo which didn't make it */ if((!write_flag) && (count - fifo) == 2) { unsigned short data; unsigned char *vaddr; data = dregs->fifo_data; vaddr = (unsigned char *)dvma_btov(sun3_dma_orig_addr); vaddr += (sun3_dma_orig_count - fifo); vaddr[-2] = (data & 0xff00) >> 8; vaddr[-1] = (data & 0xff); } #endif dvma_unmap(sun3_dma_orig_addr); sun3_dma_orig_addr = NULL; #ifdef SUN3_SCSI_VME dregs->dma_addr_hi = 0; dregs->dma_addr_lo = 0; dregs->dma_count_hi = 0; dregs->dma_count_lo = 0; dregs->fifo_count = 0; dregs->fifo_count_hi = 0; dregs->csr &= ~CSR_SEND; /* dregs->csr |= CSR_DMA_ENABLE; */ #else sun3_udc_write(UDC_RESET, UDC_CSR); dregs->fifo_count = 0; dregs->csr &= ~CSR_SEND; /* reset fifo */ dregs->csr &= ~CSR_FIFO; dregs->csr |= CSR_FIFO; #endif sun3_dma_setup_done = NULL; return ret; } #include "atari_NCR5380.c" #ifdef SUN3_SCSI_VME #define SUN3_SCSI_NAME "Sun3 NCR5380 VME SCSI" #define DRV_MODULE_NAME "sun3_scsi_vme" #else #define SUN3_SCSI_NAME "Sun3 NCR5380 SCSI" #define DRV_MODULE_NAME "sun3_scsi" #endif #define PFX DRV_MODULE_NAME ": " static struct scsi_host_template sun3_scsi_template = { .module = THIS_MODULE, .proc_name = DRV_MODULE_NAME, .show_info = sun3scsi_show_info, .name = SUN3_SCSI_NAME, .info = sun3scsi_info, .queuecommand = sun3scsi_queue_command, .eh_abort_handler = sun3scsi_abort, .eh_bus_reset_handler = sun3scsi_bus_reset, .can_queue = 16, .this_id = 7, .sg_tablesize = SG_NONE, .cmd_per_lun = 2, .use_clustering = DISABLE_CLUSTERING }; static int __init sun3_scsi_probe(struct platform_device *pdev) { struct Scsi_Host *instance; int error; struct resource *irq, *mem; unsigned char *ioaddr; int host_flags = 0; #ifdef SUN3_SCSI_VME int i; #endif if (setup_can_queue > 0) sun3_scsi_template.can_queue = setup_can_queue; if (setup_cmd_per_lun > 0) sun3_scsi_template.cmd_per_lun = setup_cmd_per_lun; if (setup_sg_tablesize >= 0) sun3_scsi_template.sg_tablesize = setup_sg_tablesize; if (setup_hostid >= 0) sun3_scsi_template.this_id = setup_hostid & 7; #ifdef SUN3_SCSI_VME ioaddr = NULL; for (i = 0; i < 2; i++) { unsigned char x; irq = platform_get_resource(pdev, IORESOURCE_IRQ, i); mem = platform_get_resource(pdev, IORESOURCE_MEM, i); if (!irq || !mem) break; ioaddr = sun3_ioremap(mem->start, resource_size(mem), SUN3_PAGE_TYPE_VME16); dregs = (struct sun3_dma_regs *)(ioaddr + 8); if (sun3_map_test((unsigned long)dregs, &x)) { unsigned short oldcsr; oldcsr = dregs->csr; dregs->csr = 0; udelay(SUN3_DMA_DELAY); if (dregs->csr == 0x1400) break; dregs->csr = oldcsr; } iounmap(ioaddr); ioaddr = NULL; } if (!ioaddr) return -ENODEV; #else irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!irq || !mem) return -ENODEV; ioaddr = ioremap(mem->start, resource_size(mem)); dregs = (struct sun3_dma_regs *)(ioaddr + 8); udc_regs = dvma_malloc(sizeof(struct sun3_udc_regs)); if (!udc_regs) { pr_err(PFX "couldn't allocate DVMA memory!\n"); iounmap(ioaddr); return -ENOMEM; } #endif sun3_scsi_regp = ioaddr; instance = scsi_host_alloc(&sun3_scsi_template, sizeof(struct NCR5380_hostdata)); if (!instance) { error = -ENOMEM; goto fail_alloc; } default_instance = instance; instance->io_port = (unsigned long)ioaddr; instance->irq = irq->start; #ifdef SUPPORT_TAGS host_flags |= setup_use_tagged_queuing > 0 ? FLAG_TAGGED_QUEUING : 0; #endif NCR5380_init(instance, host_flags); error = request_irq(instance->irq, scsi_sun3_intr, 0, "NCR5380", instance); if (error) { #ifdef REAL_DMA pr_err(PFX "scsi%d: IRQ %d not free, bailing out\n", instance->host_no, instance->irq); goto fail_irq; #else pr_warn(PFX "scsi%d: IRQ %d not free, interrupts disabled\n", instance->host_no, instance->irq); instance->irq = NO_IRQ; #endif } dregs->csr = 0; udelay(SUN3_DMA_DELAY); dregs->csr = CSR_SCSI | CSR_FIFO | CSR_INTR; udelay(SUN3_DMA_DELAY); dregs->fifo_count = 0; #ifdef SUN3_SCSI_VME dregs->fifo_count_hi = 0; dregs->dma_addr_hi = 0; dregs->dma_addr_lo = 0; dregs->dma_count_hi = 0; dregs->dma_count_lo = 0; dregs->ivect = VME_DATA24 | (instance->irq & 0xff); #endif #ifdef RESET_BOOT sun3_scsi_reset_boot(instance); #endif error = scsi_add_host(instance, NULL); if (error) goto fail_host; platform_set_drvdata(pdev, instance); scsi_scan_host(instance); return 0; fail_host: if (instance->irq != NO_IRQ) free_irq(instance->irq, instance); fail_irq: NCR5380_exit(instance); scsi_host_put(instance); fail_alloc: if (udc_regs) dvma_free(udc_regs); iounmap(sun3_scsi_regp); return error; } static int __exit sun3_scsi_remove(struct platform_device *pdev) { struct Scsi_Host *instance = platform_get_drvdata(pdev); scsi_remove_host(instance); if (instance->irq != NO_IRQ) free_irq(instance->irq, instance); NCR5380_exit(instance); scsi_host_put(instance); if (udc_regs) dvma_free(udc_regs); iounmap(sun3_scsi_regp); return 0; } static struct platform_driver sun3_scsi_driver = { .remove = __exit_p(sun3_scsi_remove), .driver = { .name = DRV_MODULE_NAME, .owner = THIS_MODULE, }, }; module_platform_driver_probe(sun3_scsi_driver, sun3_scsi_probe); MODULE_ALIAS("platform:" DRV_MODULE_NAME); MODULE_LICENSE("GPL");