4 #define UNSAFE /* Leave interrupts enabled during pseudo-dma I/O */
5 #define DMA_WORKS_RIGHT
9 * DTC 3180/3280 driver, by
10 * Ray Van Tassle rayvt@comm.mot.com
13 * Trantor T128/T128F/T228 driver by...
17 * (Unix and Linux consulting and custom programming)
23 * The card is detected and initialized in one of several ways :
24 * 1. Autoprobe (default) - since the board is memory mapped,
25 * a BIOS signature is scanned for to locate the registers.
26 * An interrupt is triggered to autoprobe for the interrupt
29 * 2. With command line overrides - dtc=address,irq may be
30 * used on the LILO command line to override the defaults.
34 /*----------------------------------------------------------------*/
35 /* the following will set the monitor border color (useful to find
36 where something crashed or gets stuck at */
46 #define rtrc(i) {inb(0x3da); outb(0x31, 0x3c0); outb((i), 0x3c0);}
52 #include <linux/module.h>
53 #include <linux/signal.h>
54 #include <linux/blkdev.h>
55 #include <linux/delay.h>
56 #include <linux/stat.h>
57 #include <linux/string.h>
58 #include <linux/init.h>
59 #include <linux/interrupt.h>
61 #include <scsi/scsi_host.h>
67 * The DTC3180 & 3280 boards are memory mapped.
73 /* Offset from DTC_5380_OFFSET */
74 #define DTC_CONTROL_REG 0x100 /* rw */
75 #define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
76 #define CSR_DIR_READ 0x40 /* rw direction, 1 = read 0 = write */
78 #define CSR_RESET 0x80 /* wo Resets 53c400 */
79 #define CSR_5380_REG 0x80 /* ro 5380 registers can be accessed */
80 #define CSR_TRANS_DIR 0x40 /* rw Data transfer direction */
81 #define CSR_SCSI_BUFF_INTR 0x20 /* rw Enable int on transfer ready */
82 #define CSR_5380_INTR 0x10 /* rw Enable 5380 interrupts */
83 #define CSR_SHARED_INTR 0x08 /* rw Interrupt sharing */
84 #define CSR_HOST_BUF_NOT_RDY 0x04 /* ro Host buffer not ready */
85 #define CSR_SCSI_BUF_RDY 0x02 /* ro SCSI buffer ready */
86 #define CSR_GATED_5380_IRQ 0x01 /* ro Last block xferred */
87 #define CSR_INT_BASE (CSR_SCSI_BUFF_INTR | CSR_5380_INTR)
90 #define DTC_BLK_CNT 0x101 /* rw
91 * # of 128-byte blocks to transfer */
94 #define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
96 #define DTC_SWITCH_REG 0x3982 /* ro - DIP switches */
97 #define DTC_RESUME_XFER 0x3982 /* wo - resume data xfer
98 * after disconnect/reconnect*/
100 #define DTC_5380_OFFSET 0x3880 /* 8 registers here, see NCR5380.h */
102 /*!!!! for dtc, it's a 128 byte buffer at 3900 !!! */
103 #define DTC_DATA_BUF 0x3900 /* rw 128 bytes long */
105 static struct override {
106 unsigned int address;
110 [] __initdata = OVERRIDE;
113 { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }
117 #define NO_OVERRIDES ARRAY_SIZE(overrides)
120 unsigned long address;
122 } bases[] __initdata = {
129 #define NO_BASES ARRAY_SIZE(bases)
131 static const struct signature {
135 {"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
138 #define NO_SIGNATURES ARRAY_SIZE(signatures)
142 * Function : dtc_setup(char *str, int *ints)
144 * Purpose : LILO command line initialization of the overrides array,
146 * Inputs : str - unused, ints - array of integer parameters with ints[0]
147 * equal to the number of ints.
151 static int __init dtc_setup(char *str)
153 static int commandline_current;
157 get_options(str, ARRAY_SIZE(ints), ints);
159 printk("dtc_setup: usage dtc=address,irq\n");
160 else if (commandline_current < NO_OVERRIDES) {
161 overrides[commandline_current].address = ints[1];
162 overrides[commandline_current].irq = ints[2];
163 for (i = 0; i < NO_BASES; ++i)
164 if (bases[i].address == ints[1]) {
168 ++commandline_current;
173 __setup("dtc=", dtc_setup);
177 * Function : int dtc_detect(struct scsi_host_template * tpnt)
179 * Purpose : detects and initializes DTC 3180/3280 controllers
180 * that were autoprobed, overridden on the LILO command line,
181 * or specified at compile time.
183 * Inputs : tpnt - template for this SCSI adapter.
185 * Returns : 1 if a host adapter was found, 0 if not.
189 static int __init dtc_detect(struct scsi_host_template * tpnt)
191 static int current_override, current_base;
192 struct Scsi_Host *instance;
197 for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
201 if (overrides[current_override].address) {
202 addr = overrides[current_override].address;
203 base = ioremap(addr, 0x2000);
207 for (; !addr && (current_base < NO_BASES); ++current_base) {
208 dprintk(NDEBUG_INIT, "dtc: probing address 0x%08x\n",
209 (unsigned int)bases[current_base].address);
210 if (bases[current_base].noauto)
212 base = ioremap(bases[current_base].address, 0x2000);
215 for (sig = 0; sig < NO_SIGNATURES; ++sig) {
216 if (check_signature(base + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
217 addr = bases[current_base].address;
218 dprintk(NDEBUG_INIT, "dtc: detected board\n");
225 dprintk(NDEBUG_INIT, "dtc: addr = 0x%08x\n", addr);
231 instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
232 if (instance == NULL)
235 instance->base = addr;
236 ((struct NCR5380_hostdata *)(instance)->hostdata)->base = base;
238 NCR5380_init(instance, 0);
240 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR); /* Enable int's */
241 if (overrides[current_override].irq != IRQ_AUTO)
242 instance->irq = overrides[current_override].irq;
244 instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
246 /* Compatibility with documented NCR5380 kernel parameters */
247 if (instance->irq == 255)
248 instance->irq = NO_IRQ;
250 #ifndef DONT_USE_INTR
251 /* With interrupts enabled, it will sometimes hang when doing heavy
252 * reads. So better not enable them until I finger it out. */
253 if (instance->irq != NO_IRQ)
254 if (request_irq(instance->irq, dtc_intr, 0,
256 printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
257 instance->irq = NO_IRQ;
260 if (instance->irq == NO_IRQ) {
261 printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
262 printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
265 if (instance->irq != NO_IRQ)
266 printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
267 instance->irq = NO_IRQ;
269 dprintk(NDEBUG_INIT, "scsi%d : irq = %d\n",
270 instance->host_no, instance->irq);
279 * Function : int dtc_biosparam(Disk * disk, struct block_device *dev, int *ip)
281 * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
282 * the specified device / size.
284 * Inputs : size = size of device in sectors (512 bytes), dev = block device
285 * major / minor, ip[] = {heads, sectors, cylinders}
287 * Returns : always 0 (success), initializes ip
292 * XXX Most SCSI boards use this mapping, I could be incorrect. Some one
293 * using hard disks on a trantor should verify that this mapping corresponds
294 * to that used by the BIOS / ASPI driver by running the linux fdisk program
295 * and matching the H_C_S coordinates to what DOS uses.
298 static int dtc_biosparam(struct scsi_device *sdev, struct block_device *dev,
299 sector_t capacity, int *ip)
310 /****************************************************************
311 * Function : int NCR5380_pread (struct Scsi_Host *instance,
312 * unsigned char *dst, int len)
314 * Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
317 * Inputs : dst = destination, len = length in bytes
319 * Returns : 0 on success, non zero on a failure such as a watchdog
323 static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
325 unsigned char *d = dst;
326 int i; /* For counting time spent in the poll-loop */
327 struct NCR5380_hostdata *hostdata = shost_priv(instance);
328 NCR5380_local_declare();
329 NCR5380_setup(instance);
332 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
333 NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
334 if (instance->irq == NO_IRQ)
335 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
337 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
338 NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
342 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
345 memcpy_fromio(d, base + DTC_DATA_BUF, 128);
349 /*** with int's on, it sometimes hangs after here.
350 * Looks like something makes HBNR go away. */
353 while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
355 NCR5380_write(MODE_REG, 0); /* Clear the operating mode */
357 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
358 if (i > hostdata->spin_max_r)
359 hostdata->spin_max_r = i;
363 /****************************************************************
364 * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
365 * unsigned char *src, int len)
367 * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
370 * Inputs : src = source, len = length in bytes
372 * Returns : 0 on success, non zero on a failure such as a watchdog
376 static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
379 struct NCR5380_hostdata *hostdata = shost_priv(instance);
380 NCR5380_local_declare();
381 NCR5380_setup(instance);
383 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
384 NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
385 /* set direction (write) */
386 if (instance->irq == NO_IRQ)
387 NCR5380_write(DTC_CONTROL_REG, 0);
389 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
390 NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
391 for (i = 0; len > 0; ++i) {
393 /* Poll until the host buffer can accept data. */
394 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
397 memcpy_toio(base + DTC_DATA_BUF, src, 128);
402 while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
405 /* Wait until the last byte has been sent to the disk */
406 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
409 /* Check for parity error here. fixme. */
410 NCR5380_write(MODE_REG, 0); /* Clear the operating mode */
412 if (i > hostdata->spin_max_w)
413 hostdata->spin_max_w = i;
417 MODULE_LICENSE("GPL");
421 static int dtc_release(struct Scsi_Host *shost)
423 NCR5380_local_declare();
424 NCR5380_setup(shost);
425 if (shost->irq != NO_IRQ)
426 free_irq(shost->irq, shost);
428 if (shost->io_port && shost->n_io_port)
429 release_region(shost->io_port, shost->n_io_port);
430 scsi_unregister(shost);
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",
440 .show_info = dtc_show_info,
441 .write_info = dtc_write_info,
443 .queuecommand = dtc_queue_command,
444 .eh_abort_handler = dtc_abort,
445 .eh_bus_reset_handler = dtc_bus_reset,
446 .bios_param = dtc_biosparam,
447 .can_queue = CAN_QUEUE,
449 .sg_tablesize = SG_ALL,
450 .cmd_per_lun = CMD_PER_LUN,
451 .use_clustering = DISABLE_CLUSTERING,
453 #include "scsi_module.c"