4 * DTC 3180/3280 driver, by
5 * Ray Van Tassle rayvt@comm.mot.com
8 * Trantor T128/T128F/T228 driver by...
12 * (Unix and Linux consulting and custom programming)
18 * The card is detected and initialized in one of several ways :
19 * 1. Autoprobe (default) - since the board is memory mapped,
20 * a BIOS signature is scanned for to locate the registers.
21 * An interrupt is triggered to autoprobe for the interrupt
24 * 2. With command line overrides - dtc=address,irq may be
25 * used on the LILO command line to override the defaults.
29 /*----------------------------------------------------------------*/
30 /* the following will set the monitor border color (useful to find
31 where something crashed or gets stuck at */
41 #define rtrc(i) {inb(0x3da); outb(0x31, 0x3c0); outb((i), 0x3c0);}
47 #include <linux/module.h>
48 #include <linux/blkdev.h>
49 #include <linux/string.h>
50 #include <linux/init.h>
51 #include <linux/interrupt.h>
53 #include <scsi/scsi_host.h>
60 * The DTC3180 & 3280 boards are memory mapped.
66 /* Offset from DTC_5380_OFFSET */
67 #define DTC_CONTROL_REG 0x100 /* rw */
68 #define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
69 #define CSR_DIR_READ 0x40 /* rw direction, 1 = read 0 = write */
71 #define CSR_RESET 0x80 /* wo Resets 53c400 */
72 #define CSR_5380_REG 0x80 /* ro 5380 registers can be accessed */
73 #define CSR_TRANS_DIR 0x40 /* rw Data transfer direction */
74 #define CSR_SCSI_BUFF_INTR 0x20 /* rw Enable int on transfer ready */
75 #define CSR_5380_INTR 0x10 /* rw Enable 5380 interrupts */
76 #define CSR_SHARED_INTR 0x08 /* rw Interrupt sharing */
77 #define CSR_HOST_BUF_NOT_RDY 0x04 /* ro Host buffer not ready */
78 #define CSR_SCSI_BUF_RDY 0x02 /* ro SCSI buffer ready */
79 #define CSR_GATED_5380_IRQ 0x01 /* ro Last block xferred */
80 #define CSR_INT_BASE (CSR_SCSI_BUFF_INTR | CSR_5380_INTR)
83 #define DTC_BLK_CNT 0x101 /* rw
84 * # of 128-byte blocks to transfer */
87 #define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
89 #define DTC_SWITCH_REG 0x3982 /* ro - DIP switches */
90 #define DTC_RESUME_XFER 0x3982 /* wo - resume data xfer
91 * after disconnect/reconnect*/
93 #define DTC_5380_OFFSET 0x3880 /* 8 registers here, see NCR5380.h */
95 /*!!!! for dtc, it's a 128 byte buffer at 3900 !!! */
96 #define DTC_DATA_BUF 0x3900 /* rw 128 bytes long */
98 static struct override {
103 [] __initdata = OVERRIDE;
106 { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }
110 #define NO_OVERRIDES ARRAY_SIZE(overrides)
113 unsigned long address;
115 } bases[] __initdata = {
122 #define NO_BASES ARRAY_SIZE(bases)
124 static const struct signature {
128 {"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
131 #define NO_SIGNATURES ARRAY_SIZE(signatures)
135 * Function : dtc_setup(char *str, int *ints)
137 * Purpose : LILO command line initialization of the overrides array,
139 * Inputs : str - unused, ints - array of integer parameters with ints[0]
140 * equal to the number of ints.
144 static int __init dtc_setup(char *str)
146 static int commandline_current;
150 get_options(str, ARRAY_SIZE(ints), ints);
152 printk("dtc_setup: usage dtc=address,irq\n");
153 else if (commandline_current < NO_OVERRIDES) {
154 overrides[commandline_current].address = ints[1];
155 overrides[commandline_current].irq = ints[2];
156 for (i = 0; i < NO_BASES; ++i)
157 if (bases[i].address == ints[1]) {
161 ++commandline_current;
166 __setup("dtc=", dtc_setup);
170 * Function : int dtc_detect(struct scsi_host_template * tpnt)
172 * Purpose : detects and initializes DTC 3180/3280 controllers
173 * that were autoprobed, overridden on the LILO command line,
174 * or specified at compile time.
176 * Inputs : tpnt - template for this SCSI adapter.
178 * Returns : 1 if a host adapter was found, 0 if not.
182 static int __init dtc_detect(struct scsi_host_template * tpnt)
184 static int current_override, current_base;
185 struct Scsi_Host *instance;
190 for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
194 if (overrides[current_override].address) {
195 addr = overrides[current_override].address;
196 base = ioremap(addr, 0x2000);
200 for (; !addr && (current_base < NO_BASES); ++current_base) {
201 dprintk(NDEBUG_INIT, "dtc: probing address 0x%08x\n",
202 (unsigned int)bases[current_base].address);
203 if (bases[current_base].noauto)
205 base = ioremap(bases[current_base].address, 0x2000);
208 for (sig = 0; sig < NO_SIGNATURES; ++sig) {
209 if (check_signature(base + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
210 addr = bases[current_base].address;
211 dprintk(NDEBUG_INIT, "dtc: detected board\n");
218 dprintk(NDEBUG_INIT, "dtc: addr = 0x%08x\n", addr);
224 instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
225 if (instance == NULL)
228 instance->base = addr;
229 ((struct NCR5380_hostdata *)(instance)->hostdata)->base = base;
231 if (NCR5380_init(instance, 0))
234 NCR5380_maybe_reset_bus(instance);
236 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR); /* Enable int's */
237 if (overrides[current_override].irq != IRQ_AUTO)
238 instance->irq = overrides[current_override].irq;
240 instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
242 /* Compatibility with documented NCR5380 kernel parameters */
243 if (instance->irq == 255)
244 instance->irq = NO_IRQ;
246 #ifndef DONT_USE_INTR
247 /* With interrupts enabled, it will sometimes hang when doing heavy
248 * reads. So better not enable them until I finger it out. */
249 if (instance->irq != NO_IRQ)
250 if (request_irq(instance->irq, dtc_intr, 0,
252 printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
253 instance->irq = NO_IRQ;
256 if (instance->irq == NO_IRQ) {
257 printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
258 printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
261 if (instance->irq != NO_IRQ)
262 printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
263 instance->irq = NO_IRQ;
265 dprintk(NDEBUG_INIT, "scsi%d : irq = %d\n",
266 instance->host_no, instance->irq);
274 scsi_unregister(instance);
281 * Function : int dtc_biosparam(Disk * disk, struct block_device *dev, int *ip)
283 * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
284 * the specified device / size.
286 * Inputs : size = size of device in sectors (512 bytes), dev = block device
287 * major / minor, ip[] = {heads, sectors, cylinders}
289 * Returns : always 0 (success), initializes ip
294 * XXX Most SCSI boards use this mapping, I could be incorrect. Some one
295 * using hard disks on a trantor should verify that this mapping corresponds
296 * to that used by the BIOS / ASPI driver by running the linux fdisk program
297 * and matching the H_C_S coordinates to what DOS uses.
300 static int dtc_biosparam(struct scsi_device *sdev, struct block_device *dev,
301 sector_t capacity, int *ip)
312 /****************************************************************
313 * Function : int NCR5380_pread (struct Scsi_Host *instance,
314 * unsigned char *dst, int len)
316 * Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
319 * Inputs : dst = destination, len = length in bytes
321 * Returns : 0 on success, non zero on a failure such as a watchdog
325 static inline int dtc_pread(struct Scsi_Host *instance,
326 unsigned char *dst, int len)
328 unsigned char *d = dst;
329 int i; /* For counting time spent in the poll-loop */
330 struct NCR5380_hostdata *hostdata = shost_priv(instance);
333 if (instance->irq == NO_IRQ)
334 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
336 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
337 NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
341 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
344 memcpy_fromio(d, hostdata->base + DTC_DATA_BUF, 128);
348 /*** with int's on, it sometimes hangs after here.
349 * Looks like something makes HBNR go away. */
352 while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
358 /****************************************************************
359 * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
360 * unsigned char *src, int len)
362 * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
365 * Inputs : src = source, len = length in bytes
367 * Returns : 0 on success, non zero on a failure such as a watchdog
371 static inline int dtc_pwrite(struct Scsi_Host *instance,
372 unsigned char *src, int len)
375 struct NCR5380_hostdata *hostdata = shost_priv(instance);
377 if (instance->irq == NO_IRQ)
378 NCR5380_write(DTC_CONTROL_REG, 0);
380 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
381 NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
382 for (i = 0; len > 0; ++i) {
384 /* Poll until the host buffer can accept data. */
385 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
388 memcpy_toio(hostdata->base + DTC_DATA_BUF, src, 128);
393 while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
396 /* Wait until the last byte has been sent to the disk */
397 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
400 /* Check for parity error here. fixme. */
405 static int dtc_dma_xfer_len(struct scsi_cmnd *cmd)
407 int transfersize = cmd->transfersize;
409 /* Limit transfers to 32K, for xx400 & xx406
410 * pseudoDMA that transfers in 128 bytes blocks.
412 if (transfersize > 32 * 1024 && cmd->SCp.this_residual &&
413 !(cmd->SCp.this_residual % transfersize))
414 transfersize = 32 * 1024;
419 MODULE_LICENSE("GPL");
423 static int dtc_release(struct Scsi_Host *shost)
425 struct NCR5380_hostdata *hostdata = shost_priv(shost);
427 if (shost->irq != NO_IRQ)
428 free_irq(shost->irq, shost);
430 scsi_unregister(shost);
431 iounmap(hostdata->base);
435 static struct scsi_host_template driver_template = {
436 .name = "DTC 3180/3280",
437 .detect = dtc_detect,
438 .release = dtc_release,
439 .proc_name = "dtc3x80",
441 .queuecommand = dtc_queue_command,
442 .eh_abort_handler = dtc_abort,
443 .eh_bus_reset_handler = dtc_bus_reset,
444 .bios_param = dtc_biosparam,
447 .sg_tablesize = SG_ALL,
449 .use_clustering = DISABLE_CLUSTERING,
450 .cmd_size = NCR5380_CMD_SIZE,
453 #include "scsi_module.c"