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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  *  linux/drivers/acorn/scsi/eesox.c
0004  *
0005  *  Copyright (C) 1997-2005 Russell King
0006  *
0007  *  This driver is based on experimentation.  Hence, it may have made
0008  *  assumptions about the particular card that I have available, and
0009  *  may not be reliable!
0010  *
0011  *  Changelog:
0012  *   01-10-1997 RMK     Created, READONLY version
0013  *   15-02-1998 RMK     READ/WRITE version
0014  *              added DMA support and hardware definitions
0015  *   14-03-1998 RMK     Updated DMA support
0016  *              Added terminator control
0017  *   15-04-1998 RMK     Only do PIO if FAS216 will allow it.
0018  *   27-06-1998 RMK     Changed asm/delay.h to linux/delay.h
0019  *   02-04-2000 RMK 0.0.3   Fixed NO_IRQ/NO_DMA problem, updated for new
0020  *              error handling code.
0021  */
0022 #include <linux/module.h>
0023 #include <linux/blkdev.h>
0024 #include <linux/kernel.h>
0025 #include <linux/string.h>
0026 #include <linux/ioport.h>
0027 #include <linux/proc_fs.h>
0028 #include <linux/delay.h>
0029 #include <linux/interrupt.h>
0030 #include <linux/init.h>
0031 #include <linux/dma-mapping.h>
0032 #include <linux/pgtable.h>
0033 
0034 #include <asm/io.h>
0035 #include <asm/dma.h>
0036 #include <asm/ecard.h>
0037 
0038 #include <scsi/scsi.h>
0039 #include <scsi/scsi_cmnd.h>
0040 #include <scsi/scsi_device.h>
0041 #include <scsi/scsi_eh.h>
0042 #include <scsi/scsi_host.h>
0043 #include <scsi/scsi_tcq.h>
0044 #include "fas216.h"
0045 #include "arm_scsi.h"
0046 
0047 #include <scsi/scsicam.h>
0048 
0049 #define EESOX_FAS216_OFFSET 0x3000
0050 #define EESOX_FAS216_SHIFT  5
0051 
0052 #define EESOX_DMASTAT       0x2800
0053 #define EESOX_STAT_INTR     0x01
0054 #define EESOX_STAT_DMA      0x02
0055 
0056 #define EESOX_CONTROL       0x2800
0057 #define EESOX_INTR_ENABLE   0x04
0058 #define EESOX_TERM_ENABLE   0x02
0059 #define EESOX_RESET     0x01
0060 
0061 #define EESOX_DMADATA       0x3800
0062 
0063 #define VERSION "1.10 (17/01/2003 2.5.59)"
0064 
0065 /*
0066  * Use term=0,1,0,0,0 to turn terminators on/off
0067  */
0068 static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
0069 
0070 #define NR_SG   256
0071 
0072 struct eesoxscsi_info {
0073     FAS216_Info     info;
0074     struct expansion_card   *ec;
0075     void __iomem        *base;
0076     void __iomem        *ctl_port;
0077     unsigned int        control;
0078     struct scatterlist  sg[NR_SG];  /* Scatter DMA list */
0079 };
0080 
0081 /* Prototype: void eesoxscsi_irqenable(ec, irqnr)
0082  * Purpose  : Enable interrupts on EESOX SCSI card
0083  * Params   : ec    - expansion card structure
0084  *          : irqnr - interrupt number
0085  */
0086 static void
0087 eesoxscsi_irqenable(struct expansion_card *ec, int irqnr)
0088 {
0089     struct eesoxscsi_info *info = (struct eesoxscsi_info *)ec->irq_data;
0090 
0091     info->control |= EESOX_INTR_ENABLE;
0092 
0093     writeb(info->control, info->ctl_port);
0094 }
0095 
0096 /* Prototype: void eesoxscsi_irqdisable(ec, irqnr)
0097  * Purpose  : Disable interrupts on EESOX SCSI card
0098  * Params   : ec    - expansion card structure
0099  *          : irqnr - interrupt number
0100  */
0101 static void
0102 eesoxscsi_irqdisable(struct expansion_card *ec, int irqnr)
0103 {
0104     struct eesoxscsi_info *info = (struct eesoxscsi_info *)ec->irq_data;
0105 
0106     info->control &= ~EESOX_INTR_ENABLE;
0107 
0108     writeb(info->control, info->ctl_port);
0109 }
0110 
0111 static const expansioncard_ops_t eesoxscsi_ops = {
0112     .irqenable  = eesoxscsi_irqenable,
0113     .irqdisable = eesoxscsi_irqdisable,
0114 };
0115 
0116 /* Prototype: void eesoxscsi_terminator_ctl(*host, on_off)
0117  * Purpose  : Turn the EESOX SCSI terminators on or off
0118  * Params   : host   - card to turn on/off
0119  *          : on_off - !0 to turn on, 0 to turn off
0120  */
0121 static void
0122 eesoxscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
0123 {
0124     struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
0125     unsigned long flags;
0126 
0127     spin_lock_irqsave(host->host_lock, flags);
0128     if (on_off)
0129         info->control |= EESOX_TERM_ENABLE;
0130     else
0131         info->control &= ~EESOX_TERM_ENABLE;
0132 
0133     writeb(info->control, info->ctl_port);
0134     spin_unlock_irqrestore(host->host_lock, flags);
0135 }
0136 
0137 /* Prototype: void eesoxscsi_intr(irq, *dev_id, *regs)
0138  * Purpose  : handle interrupts from EESOX SCSI card
0139  * Params   : irq    - interrupt number
0140  *        dev_id - user-defined (Scsi_Host structure)
0141  */
0142 static irqreturn_t
0143 eesoxscsi_intr(int irq, void *dev_id)
0144 {
0145     struct eesoxscsi_info *info = dev_id;
0146 
0147     return fas216_intr(&info->info);
0148 }
0149 
0150 /* Prototype: fasdmatype_t eesoxscsi_dma_setup(host, SCpnt, direction, min_type)
0151  * Purpose  : initialises DMA/PIO
0152  * Params   : host      - host
0153  *        SCpnt     - command
0154  *        direction - DMA on to/off of card
0155  *        min_type  - minimum DMA support that we must have for this transfer
0156  * Returns  : type of transfer to be performed
0157  */
0158 static fasdmatype_t
0159 eesoxscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
0160                fasdmadir_t direction, fasdmatype_t min_type)
0161 {
0162     struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
0163     struct device *dev = scsi_get_device(host);
0164     int dmach = info->info.scsi.dma;
0165 
0166     if (dmach != NO_DMA &&
0167         (min_type == fasdma_real_all || SCp->this_residual >= 512)) {
0168         int bufs, map_dir, dma_dir;
0169 
0170         bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
0171 
0172         if (direction == DMA_OUT) {
0173             map_dir = DMA_TO_DEVICE;
0174             dma_dir = DMA_MODE_WRITE;
0175         } else {
0176             map_dir = DMA_FROM_DEVICE;
0177             dma_dir = DMA_MODE_READ;
0178         }
0179 
0180         dma_map_sg(dev, info->sg, bufs, map_dir);
0181 
0182         disable_dma(dmach);
0183         set_dma_sg(dmach, info->sg, bufs);
0184         set_dma_mode(dmach, dma_dir);
0185         enable_dma(dmach);
0186         return fasdma_real_all;
0187     }
0188     /*
0189      * We don't do DMA, we only do slow PIO
0190      *
0191      * Some day, we will do Pseudo DMA
0192      */
0193     return fasdma_pseudo;
0194 }
0195 
0196 static void eesoxscsi_buffer_in(void *buf, int length, void __iomem *base)
0197 {
0198     const void __iomem *reg_fas = base + EESOX_FAS216_OFFSET;
0199     const void __iomem *reg_dmastat = base + EESOX_DMASTAT;
0200     const void __iomem *reg_dmadata = base + EESOX_DMADATA;
0201     register const unsigned long mask = 0xffff;
0202 
0203     do {
0204         unsigned int status;
0205 
0206         /*
0207          * Interrupt request?
0208          */
0209         status = readb(reg_fas + (REG_STAT << EESOX_FAS216_SHIFT));
0210         if (status & STAT_INT)
0211             break;
0212 
0213         /*
0214          * DMA request active?
0215          */
0216         status = readb(reg_dmastat);
0217         if (!(status & EESOX_STAT_DMA))
0218             continue;
0219 
0220         /*
0221          * Get number of bytes in FIFO
0222          */
0223         status = readb(reg_fas + (REG_CFIS << EESOX_FAS216_SHIFT)) & CFIS_CF;
0224         if (status > 16)
0225             status = 16;
0226         if (status > length)
0227             status = length;
0228 
0229         /*
0230          * Align buffer.
0231          */
0232         if (((u32)buf) & 2 && status >= 2) {
0233             *(u16 *)buf = readl(reg_dmadata);
0234             buf += 2;
0235             status -= 2;
0236             length -= 2;
0237         }
0238 
0239         if (status >= 8) {
0240             unsigned long l1, l2;
0241 
0242             l1 = readl(reg_dmadata) & mask;
0243             l1 |= readl(reg_dmadata) << 16;
0244             l2 = readl(reg_dmadata) & mask;
0245             l2 |= readl(reg_dmadata) << 16;
0246             *(u32 *)buf = l1;
0247             buf += 4;
0248             *(u32 *)buf = l2;
0249             buf += 4;
0250             length -= 8;
0251             continue;
0252         }
0253 
0254         if (status >= 4) {
0255             unsigned long l1;
0256 
0257             l1 = readl(reg_dmadata) & mask;
0258             l1 |= readl(reg_dmadata) << 16;
0259 
0260             *(u32 *)buf = l1;
0261             buf += 4;
0262             length -= 4;
0263             continue;
0264         }
0265 
0266         if (status >= 2) {
0267             *(u16 *)buf = readl(reg_dmadata);
0268             buf += 2;
0269             length -= 2;
0270         }
0271     } while (length);
0272 }
0273 
0274 static void eesoxscsi_buffer_out(void *buf, int length, void __iomem *base)
0275 {
0276     const void __iomem *reg_fas = base + EESOX_FAS216_OFFSET;
0277     const void __iomem *reg_dmastat = base + EESOX_DMASTAT;
0278     void __iomem *reg_dmadata = base + EESOX_DMADATA;
0279 
0280     do {
0281         unsigned int status;
0282 
0283         /*
0284          * Interrupt request?
0285          */
0286         status = readb(reg_fas + (REG_STAT << EESOX_FAS216_SHIFT));
0287         if (status & STAT_INT)
0288             break;
0289 
0290         /*
0291          * DMA request active?
0292          */
0293         status = readb(reg_dmastat);
0294         if (!(status & EESOX_STAT_DMA))
0295             continue;
0296 
0297         /*
0298          * Get number of bytes in FIFO
0299          */
0300         status = readb(reg_fas + (REG_CFIS << EESOX_FAS216_SHIFT)) & CFIS_CF;
0301         if (status > 16)
0302             status = 16;
0303         status = 16 - status;
0304         if (status > length)
0305             status = length;
0306         status &= ~1;
0307 
0308         /*
0309          * Align buffer.
0310          */
0311         if (((u32)buf) & 2 && status >= 2) {
0312             writel(*(u16 *)buf << 16, reg_dmadata);
0313             buf += 2;
0314             status -= 2;
0315             length -= 2;
0316         }
0317 
0318         if (status >= 8) {
0319             unsigned long l1, l2;
0320 
0321             l1 = *(u32 *)buf;
0322             buf += 4;
0323             l2 = *(u32 *)buf;
0324             buf += 4;
0325 
0326             writel(l1 << 16, reg_dmadata);
0327             writel(l1, reg_dmadata);
0328             writel(l2 << 16, reg_dmadata);
0329             writel(l2, reg_dmadata);
0330             length -= 8;
0331             continue;
0332         }
0333 
0334         if (status >= 4) {
0335             unsigned long l1;
0336 
0337             l1 = *(u32 *)buf;
0338             buf += 4;
0339 
0340             writel(l1 << 16, reg_dmadata);
0341             writel(l1, reg_dmadata);
0342             length -= 4;
0343             continue;
0344         }
0345 
0346         if (status >= 2) {
0347             writel(*(u16 *)buf << 16, reg_dmadata);
0348             buf += 2;
0349             length -= 2;
0350         }
0351     } while (length);
0352 }
0353 
0354 static void
0355 eesoxscsi_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
0356              fasdmadir_t dir, int transfer_size)
0357 {
0358     struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
0359     if (dir == DMA_IN) {
0360         eesoxscsi_buffer_in(SCp->ptr, SCp->this_residual, info->base);
0361     } else {
0362         eesoxscsi_buffer_out(SCp->ptr, SCp->this_residual, info->base);
0363     }
0364 }
0365 
0366 /* Prototype: int eesoxscsi_dma_stop(host, SCpnt)
0367  * Purpose  : stops DMA/PIO
0368  * Params   : host  - host
0369  *        SCpnt - command
0370  */
0371 static void
0372 eesoxscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
0373 {
0374     struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
0375     if (info->info.scsi.dma != NO_DMA)
0376         disable_dma(info->info.scsi.dma);
0377 }
0378 
0379 /* Prototype: const char *eesoxscsi_info(struct Scsi_Host * host)
0380  * Purpose  : returns a descriptive string about this interface,
0381  * Params   : host - driver host structure to return info for.
0382  * Returns  : pointer to a static buffer containing null terminated string.
0383  */
0384 const char *eesoxscsi_info(struct Scsi_Host *host)
0385 {
0386     struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
0387     static char string[150];
0388 
0389     sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
0390         host->hostt->name, info->info.scsi.type, info->ec->slot_no,
0391         VERSION, info->control & EESOX_TERM_ENABLE ? "n" : "ff");
0392 
0393     return string;
0394 }
0395 
0396 /* Prototype: int eesoxscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
0397  * Purpose  : Set a driver specific function
0398  * Params   : host   - host to setup
0399  *          : buffer - buffer containing string describing operation
0400  *          : length - length of string
0401  * Returns  : -EINVAL, or 0
0402  */
0403 static int
0404 eesoxscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
0405 {
0406     int ret = length;
0407 
0408     if (length >= 9 && strncmp(buffer, "EESOXSCSI", 9) == 0) {
0409         buffer += 9;
0410         length -= 9;
0411 
0412         if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
0413             if (buffer[5] == '1')
0414                 eesoxscsi_terminator_ctl(host, 1);
0415             else if (buffer[5] == '0')
0416                 eesoxscsi_terminator_ctl(host, 0);
0417             else
0418                 ret = -EINVAL;
0419         } else
0420             ret = -EINVAL;
0421     } else
0422         ret = -EINVAL;
0423 
0424     return ret;
0425 }
0426 
0427 static int eesoxscsi_show_info(struct seq_file *m, struct Scsi_Host *host)
0428 {
0429     struct eesoxscsi_info *info;
0430 
0431     info = (struct eesoxscsi_info *)host->hostdata;
0432 
0433     seq_printf(m, "EESOX SCSI driver v%s\n", VERSION);
0434     fas216_print_host(&info->info, m);
0435     seq_printf(m, "Term    : o%s\n",
0436             info->control & EESOX_TERM_ENABLE ? "n" : "ff");
0437 
0438     fas216_print_stats(&info->info, m);
0439     fas216_print_devices(&info->info, m);
0440     return 0;
0441 }
0442 
0443 static ssize_t eesoxscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf)
0444 {
0445     struct expansion_card *ec = ECARD_DEV(dev);
0446     struct Scsi_Host *host = ecard_get_drvdata(ec);
0447     struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
0448 
0449     return sprintf(buf, "%d\n", info->control & EESOX_TERM_ENABLE ? 1 : 0);
0450 }
0451 
0452 static ssize_t eesoxscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
0453 {
0454     struct expansion_card *ec = ECARD_DEV(dev);
0455     struct Scsi_Host *host = ecard_get_drvdata(ec);
0456     struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
0457     unsigned long flags;
0458 
0459     if (len > 1) {
0460         spin_lock_irqsave(host->host_lock, flags);
0461         if (buf[0] != '0') {
0462             info->control |= EESOX_TERM_ENABLE;
0463         } else {
0464             info->control &= ~EESOX_TERM_ENABLE;
0465         }
0466         writeb(info->control, info->ctl_port);
0467         spin_unlock_irqrestore(host->host_lock, flags);
0468     }
0469 
0470     return len;
0471 }
0472 
0473 static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR,
0474            eesoxscsi_show_term, eesoxscsi_store_term);
0475 
0476 static struct scsi_host_template eesox_template = {
0477     .module             = THIS_MODULE,
0478     .show_info          = eesoxscsi_show_info,
0479     .write_info         = eesoxscsi_set_proc_info,
0480     .name               = "EESOX SCSI",
0481     .info               = eesoxscsi_info,
0482     .queuecommand           = fas216_queue_command,
0483     .eh_host_reset_handler      = fas216_eh_host_reset,
0484     .eh_bus_reset_handler       = fas216_eh_bus_reset,
0485     .eh_device_reset_handler    = fas216_eh_device_reset,
0486     .eh_abort_handler       = fas216_eh_abort,
0487     .cmd_size           = sizeof(struct fas216_cmd_priv),
0488     .can_queue          = 1,
0489     .this_id            = 7,
0490     .sg_tablesize           = SG_MAX_SEGMENTS,
0491     .dma_boundary           = IOMD_DMA_BOUNDARY,
0492     .proc_name          = "eesox",
0493 };
0494 
0495 static int eesoxscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
0496 {
0497     struct Scsi_Host *host;
0498     struct eesoxscsi_info *info;
0499     void __iomem *base;
0500     int ret;
0501 
0502     ret = ecard_request_resources(ec);
0503     if (ret)
0504         goto out;
0505 
0506     base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
0507     if (!base) {
0508         ret = -ENOMEM;
0509         goto out_region;
0510     }
0511 
0512     host = scsi_host_alloc(&eesox_template,
0513                    sizeof(struct eesoxscsi_info));
0514     if (!host) {
0515         ret = -ENOMEM;
0516         goto out_region;
0517     }
0518 
0519     ecard_set_drvdata(ec, host);
0520 
0521     info = (struct eesoxscsi_info *)host->hostdata;
0522     info->ec    = ec;
0523     info->base  = base;
0524     info->ctl_port  = base + EESOX_CONTROL;
0525     info->control   = term[ec->slot_no] ? EESOX_TERM_ENABLE : 0;
0526     writeb(info->control, info->ctl_port);
0527 
0528     info->info.scsi.io_base     = base + EESOX_FAS216_OFFSET;
0529     info->info.scsi.io_shift    = EESOX_FAS216_SHIFT;
0530     info->info.scsi.irq     = ec->irq;
0531     info->info.scsi.dma     = ec->dma;
0532     info->info.ifcfg.clockrate  = 40; /* MHz */
0533     info->info.ifcfg.select_timeout = 255;
0534     info->info.ifcfg.asyncperiod    = 200; /* ns */
0535     info->info.ifcfg.sync_max_depth = 7;
0536     info->info.ifcfg.cntl3      = CNTL3_FASTSCSI | CNTL3_FASTCLK;
0537     info->info.ifcfg.disconnect_ok  = 1;
0538     info->info.ifcfg.wide_max_size  = 0;
0539     info->info.ifcfg.capabilities   = FASCAP_PSEUDODMA;
0540     info->info.dma.setup        = eesoxscsi_dma_setup;
0541     info->info.dma.pseudo       = eesoxscsi_dma_pseudo;
0542     info->info.dma.stop     = eesoxscsi_dma_stop;
0543 
0544     ec->irqaddr = base + EESOX_DMASTAT;
0545     ec->irqmask = EESOX_STAT_INTR;
0546 
0547     ecard_setirq(ec, &eesoxscsi_ops, info);
0548 
0549     device_create_file(&ec->dev, &dev_attr_bus_term);
0550 
0551     ret = fas216_init(host);
0552     if (ret)
0553         goto out_free;
0554 
0555     ret = request_irq(ec->irq, eesoxscsi_intr, 0, "eesoxscsi", info);
0556     if (ret) {
0557         printk("scsi%d: IRQ%d not free: %d\n",
0558                host->host_no, ec->irq, ret);
0559         goto out_remove;
0560     }
0561 
0562     if (info->info.scsi.dma != NO_DMA) {
0563         if (request_dma(info->info.scsi.dma, "eesox")) {
0564             printk("scsi%d: DMA%d not free, DMA disabled\n",
0565                    host->host_no, info->info.scsi.dma);
0566             info->info.scsi.dma = NO_DMA;
0567         } else {
0568             set_dma_speed(info->info.scsi.dma, 180);
0569             info->info.ifcfg.capabilities |= FASCAP_DMA;
0570             info->info.ifcfg.cntl3 |= CNTL3_BS8;
0571         }
0572     }
0573 
0574     ret = fas216_add(host, &ec->dev);
0575     if (ret == 0)
0576         goto out;
0577 
0578     if (info->info.scsi.dma != NO_DMA)
0579         free_dma(info->info.scsi.dma);
0580     free_irq(ec->irq, info);
0581 
0582  out_remove:
0583     fas216_remove(host);
0584 
0585  out_free:
0586     device_remove_file(&ec->dev, &dev_attr_bus_term);
0587     scsi_host_put(host);
0588 
0589  out_region:
0590     ecard_release_resources(ec);
0591 
0592  out:
0593     return ret;
0594 }
0595 
0596 static void eesoxscsi_remove(struct expansion_card *ec)
0597 {
0598     struct Scsi_Host *host = ecard_get_drvdata(ec);
0599     struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
0600 
0601     ecard_set_drvdata(ec, NULL);
0602     fas216_remove(host);
0603 
0604     if (info->info.scsi.dma != NO_DMA)
0605         free_dma(info->info.scsi.dma);
0606     free_irq(ec->irq, info);
0607 
0608     device_remove_file(&ec->dev, &dev_attr_bus_term);
0609 
0610     fas216_release(host);
0611     scsi_host_put(host);
0612     ecard_release_resources(ec);
0613 }
0614 
0615 static const struct ecard_id eesoxscsi_cids[] = {
0616     { MANU_EESOX, PROD_EESOX_SCSI2 },
0617     { 0xffff, 0xffff },
0618 };
0619 
0620 static struct ecard_driver eesoxscsi_driver = {
0621     .probe      = eesoxscsi_probe,
0622     .remove     = eesoxscsi_remove,
0623     .id_table   = eesoxscsi_cids,
0624     .drv = {
0625         .name       = "eesoxscsi",
0626     },
0627 };
0628 
0629 static int __init eesox_init(void)
0630 {
0631     return ecard_register_driver(&eesoxscsi_driver);
0632 }
0633 
0634 static void __exit eesox_exit(void)
0635 {
0636     ecard_remove_driver(&eesoxscsi_driver);
0637 }
0638 
0639 module_init(eesox_init);
0640 module_exit(eesox_exit);
0641 
0642 MODULE_AUTHOR("Russell King");
0643 MODULE_DESCRIPTION("EESOX 'Fast' SCSI driver for Acorn machines");
0644 module_param_array(term, int, NULL, 0);
0645 MODULE_PARM_DESC(term, "SCSI bus termination");
0646 MODULE_LICENSE("GPL");
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