5 * DTC 3180/3280 driver, by
6 * Ray Van Tassle rayvt@comm.mot.com
9 * Trantor T128/T128F/T228 driver by...
13 * (Unix and Linux consulting and custom programming)
19 * The card is detected and initialized in one of several ways :
20 * 1. Autoprobe (default) - since the board is memory mapped,
21 * a BIOS signature is scanned for to locate the registers.
22 * An interrupt is triggered to autoprobe for the interrupt
25 * 2. With command line overrides - dtc=address,irq may be
26 * used on the LILO command line to override the defaults.
30 /*----------------------------------------------------------------*/
31 /* the following will set the monitor border color (useful to find
32 where something crashed or gets stuck at */
42 #define rtrc(i) {inb(0x3da); outb(0x31, 0x3c0); outb((i), 0x3c0);}
48 #include <linux/module.h>
49 #include <linux/signal.h>
50 #include <linux/blkdev.h>
51 #include <linux/delay.h>
52 #include <linux/stat.h>
53 #include <linux/string.h>
54 #include <linux/init.h>
55 #include <linux/interrupt.h>
57 #include <scsi/scsi_host.h>
63 * The DTC3180 & 3280 boards are memory mapped.
69 /* Offset from DTC_5380_OFFSET */
70 #define DTC_CONTROL_REG 0x100 /* rw */
71 #define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
72 #define CSR_DIR_READ 0x40 /* rw direction, 1 = read 0 = write */
74 #define CSR_RESET 0x80 /* wo Resets 53c400 */
75 #define CSR_5380_REG 0x80 /* ro 5380 registers can be accessed */
76 #define CSR_TRANS_DIR 0x40 /* rw Data transfer direction */
77 #define CSR_SCSI_BUFF_INTR 0x20 /* rw Enable int on transfer ready */
78 #define CSR_5380_INTR 0x10 /* rw Enable 5380 interrupts */
79 #define CSR_SHARED_INTR 0x08 /* rw Interrupt sharing */
80 #define CSR_HOST_BUF_NOT_RDY 0x04 /* ro Host buffer not ready */
81 #define CSR_SCSI_BUF_RDY 0x02 /* ro SCSI buffer ready */
82 #define CSR_GATED_5380_IRQ 0x01 /* ro Last block xferred */
83 #define CSR_INT_BASE (CSR_SCSI_BUFF_INTR | CSR_5380_INTR)
86 #define DTC_BLK_CNT 0x101 /* rw
87 * # of 128-byte blocks to transfer */
90 #define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
92 #define DTC_SWITCH_REG 0x3982 /* ro - DIP switches */
93 #define DTC_RESUME_XFER 0x3982 /* wo - resume data xfer
94 * after disconnect/reconnect*/
96 #define DTC_5380_OFFSET 0x3880 /* 8 registers here, see NCR5380.h */
98 /*!!!! for dtc, it's a 128 byte buffer at 3900 !!! */
99 #define DTC_DATA_BUF 0x3900 /* rw 128 bytes long */
101 static struct override {
102 unsigned int address;
106 [] __initdata = OVERRIDE;
109 { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }
113 #define NO_OVERRIDES ARRAY_SIZE(overrides)
116 unsigned long address;
118 } bases[] __initdata = {
125 #define NO_BASES ARRAY_SIZE(bases)
127 static const struct signature {
131 {"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
134 #define NO_SIGNATURES ARRAY_SIZE(signatures)
138 * Function : dtc_setup(char *str, int *ints)
140 * Purpose : LILO command line initialization of the overrides array,
142 * Inputs : str - unused, ints - array of integer parameters with ints[0]
143 * equal to the number of ints.
147 static int __init dtc_setup(char *str)
149 static int commandline_current;
153 get_options(str, ARRAY_SIZE(ints), ints);
155 printk("dtc_setup: usage dtc=address,irq\n");
156 else if (commandline_current < NO_OVERRIDES) {
157 overrides[commandline_current].address = ints[1];
158 overrides[commandline_current].irq = ints[2];
159 for (i = 0; i < NO_BASES; ++i)
160 if (bases[i].address == ints[1]) {
164 ++commandline_current;
169 __setup("dtc=", dtc_setup);
173 * Function : int dtc_detect(struct scsi_host_template * tpnt)
175 * Purpose : detects and initializes DTC 3180/3280 controllers
176 * that were autoprobed, overridden on the LILO command line,
177 * or specified at compile time.
179 * Inputs : tpnt - template for this SCSI adapter.
181 * Returns : 1 if a host adapter was found, 0 if not.
185 static int __init dtc_detect(struct scsi_host_template * tpnt)
187 static int current_override, current_base;
188 struct Scsi_Host *instance;
193 for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
197 if (overrides[current_override].address) {
198 addr = overrides[current_override].address;
199 base = ioremap(addr, 0x2000);
203 for (; !addr && (current_base < NO_BASES); ++current_base) {
204 dprintk(NDEBUG_INIT, "dtc: probing address 0x%08x\n",
205 (unsigned int)bases[current_base].address);
206 if (bases[current_base].noauto)
208 base = ioremap(bases[current_base].address, 0x2000);
211 for (sig = 0; sig < NO_SIGNATURES; ++sig) {
212 if (check_signature(base + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
213 addr = bases[current_base].address;
214 dprintk(NDEBUG_INIT, "dtc: detected board\n");
221 dprintk(NDEBUG_INIT, "dtc: addr = 0x%08x\n", addr);
227 instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
228 if (instance == NULL)
231 instance->base = addr;
232 ((struct NCR5380_hostdata *)(instance)->hostdata)->base = base;
234 if (NCR5380_init(instance, FLAG_NO_DMA_FIXUP))
237 NCR5380_maybe_reset_bus(instance);
239 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR); /* Enable int's */
240 if (overrides[current_override].irq != IRQ_AUTO)
241 instance->irq = overrides[current_override].irq;
243 instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
245 /* Compatibility with documented NCR5380 kernel parameters */
246 if (instance->irq == 255)
247 instance->irq = NO_IRQ;
249 #ifndef DONT_USE_INTR
250 /* With interrupts enabled, it will sometimes hang when doing heavy
251 * reads. So better not enable them until I finger it out. */
252 if (instance->irq != NO_IRQ)
253 if (request_irq(instance->irq, dtc_intr, 0,
255 printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
256 instance->irq = NO_IRQ;
259 if (instance->irq == NO_IRQ) {
260 printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
261 printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
264 if (instance->irq != NO_IRQ)
265 printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
266 instance->irq = NO_IRQ;
268 dprintk(NDEBUG_INIT, "scsi%d : irq = %d\n",
269 instance->host_no, instance->irq);
277 scsi_unregister(instance);
284 * Function : int dtc_biosparam(Disk * disk, struct block_device *dev, int *ip)
286 * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
287 * the specified device / size.
289 * Inputs : size = size of device in sectors (512 bytes), dev = block device
290 * major / minor, ip[] = {heads, sectors, cylinders}
292 * Returns : always 0 (success), initializes ip
297 * XXX Most SCSI boards use this mapping, I could be incorrect. Some one
298 * using hard disks on a trantor should verify that this mapping corresponds
299 * to that used by the BIOS / ASPI driver by running the linux fdisk program
300 * and matching the H_C_S coordinates to what DOS uses.
303 static int dtc_biosparam(struct scsi_device *sdev, struct block_device *dev,
304 sector_t capacity, int *ip)
315 /****************************************************************
316 * Function : int NCR5380_pread (struct Scsi_Host *instance,
317 * unsigned char *dst, int len)
319 * Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
322 * Inputs : dst = destination, len = length in bytes
324 * Returns : 0 on success, non zero on a failure such as a watchdog
328 static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
330 unsigned char *d = dst;
331 int i; /* For counting time spent in the poll-loop */
332 struct NCR5380_hostdata *hostdata = shost_priv(instance);
335 if (instance->irq == NO_IRQ)
336 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
338 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
339 NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
343 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
346 memcpy_fromio(d, hostdata->base + DTC_DATA_BUF, 128);
350 /*** with int's on, it sometimes hangs after here.
351 * Looks like something makes HBNR go away. */
354 while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
357 if (i > hostdata->spin_max_r)
358 hostdata->spin_max_r = i;
362 /****************************************************************
363 * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
364 * unsigned char *src, int len)
366 * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
369 * Inputs : src = source, len = length in bytes
371 * Returns : 0 on success, non zero on a failure such as a watchdog
375 static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
378 struct NCR5380_hostdata *hostdata = shost_priv(instance);
380 if (instance->irq == NO_IRQ)
381 NCR5380_write(DTC_CONTROL_REG, 0);
383 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
384 NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
385 for (i = 0; len > 0; ++i) {
387 /* Poll until the host buffer can accept data. */
388 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
391 memcpy_toio(hostdata->base + DTC_DATA_BUF, src, 128);
396 while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
399 /* Wait until the last byte has been sent to the disk */
400 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
403 /* Check for parity error here. fixme. */
405 if (i > hostdata->spin_max_w)
406 hostdata->spin_max_w = i;
410 static int dtc_dma_xfer_len(struct scsi_cmnd *cmd)
412 int transfersize = cmd->transfersize;
414 /* Limit transfers to 32K, for xx400 & xx406
415 * pseudoDMA that transfers in 128 bytes blocks.
417 if (transfersize > 32 * 1024 && cmd->SCp.this_residual &&
418 !(cmd->SCp.this_residual % transfersize))
419 transfersize = 32 * 1024;
424 MODULE_LICENSE("GPL");
428 static int dtc_release(struct Scsi_Host *shost)
430 struct NCR5380_hostdata *hostdata = shost_priv(shost);
432 if (shost->irq != NO_IRQ)
433 free_irq(shost->irq, shost);
435 scsi_unregister(shost);
436 iounmap(hostdata->base);
440 static struct scsi_host_template driver_template = {
441 .name = "DTC 3180/3280 ",
442 .detect = dtc_detect,
443 .release = dtc_release,
444 .proc_name = "dtc3x80",
445 .show_info = dtc_show_info,
446 .write_info = dtc_write_info,
448 .queuecommand = dtc_queue_command,
449 .eh_abort_handler = dtc_abort,
450 .eh_bus_reset_handler = dtc_bus_reset,
451 .bios_param = dtc_biosparam,
452 .can_queue = CAN_QUEUE,
454 .sg_tablesize = SG_ALL,
455 .cmd_per_lun = CMD_PER_LUN,
456 .use_clustering = DISABLE_CLUSTERING,
458 #include "scsi_module.c"