2 * Oktagon_esp.c -- Driver for bsc Oktagon
4 * Written by Carsten Pluntke 1998
9 #include <linux/config.h>
11 #if defined(CONFIG_AMIGA) || defined(CONFIG_APUS)
12 #define USE_BOTTOM_HALF
15 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/delay.h>
19 #include <linux/types.h>
20 #include <linux/string.h>
21 #include <linux/slab.h>
22 #include <linux/blkdev.h>
23 #include <linux/proc_fs.h>
24 #include <linux/stat.h>
25 #include <linux/reboot.h>
26 #include <asm/system.h>
27 #include <asm/ptrace.h>
28 #include <asm/pgtable.h>
32 #include <scsi/scsi_host.h>
35 #include <linux/zorro.h>
37 #include <asm/amigaints.h>
38 #include <asm/amigahw.h>
40 #ifdef USE_BOTTOM_HALF
41 #include <linux/workqueue.h>
42 #include <linux/interrupt.h>
45 /* The controller registers can be found in the Z2 config area at these
48 #define OKTAGON_ESP_ADDR 0x03000
49 #define OKTAGON_DMA_ADDR 0x01000
52 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count);
53 static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp);
54 static void dma_dump_state(struct NCR_ESP *esp);
55 static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length);
56 static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length);
57 static void dma_ints_off(struct NCR_ESP *esp);
58 static void dma_ints_on(struct NCR_ESP *esp);
59 static int dma_irq_p(struct NCR_ESP *esp);
60 static void dma_led_off(struct NCR_ESP *esp);
61 static void dma_led_on(struct NCR_ESP *esp);
62 static int dma_ports_p(struct NCR_ESP *esp);
63 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write);
65 static void dma_irq_exit(struct NCR_ESP *esp);
66 static void dma_invalidate(struct NCR_ESP *esp);
68 static void dma_mmu_get_scsi_one(struct NCR_ESP *,Scsi_Cmnd *);
69 static void dma_mmu_get_scsi_sgl(struct NCR_ESP *,Scsi_Cmnd *);
70 static void dma_mmu_release_scsi_one(struct NCR_ESP *,Scsi_Cmnd *);
71 static void dma_mmu_release_scsi_sgl(struct NCR_ESP *,Scsi_Cmnd *);
72 static void dma_advance_sg(Scsi_Cmnd *);
73 static int oktagon_notify_reboot(struct notifier_block *this, unsigned long code, void *x);
75 #ifdef USE_BOTTOM_HALF
76 static void dma_commit(void *opaque);
78 long oktag_to_io(long *paddr, long *addr, long len);
79 long oktag_from_io(long *addr, long *paddr, long len);
81 static DECLARE_WORK(tq_fake_dma, dma_commit, NULL);
83 #define DMA_MAXTRANSFER 0x8000
88 * No bottom half. Use transfer directly from IRQ. Find a narrow path
89 * between too much IRQ overhead and clogging the IRQ for too long.
92 #define DMA_MAXTRANSFER 0x1000
96 static struct notifier_block oktagon_notifier = {
97 oktagon_notify_reboot,
102 static long *paddress;
103 static long *address;
106 static int direction;
107 static struct NCR_ESP *current_esp;
110 static volatile unsigned char cmd_buffer[16];
111 /* This is where all commands are put
112 * before they are trasfered to the ESP chip
116 /***************************************************************** Detection */
117 int oktagon_esp_detect(Scsi_Host_Template *tpnt)
120 struct zorro_dev *z = NULL;
121 unsigned long address;
122 struct ESP_regs *eregs;
124 while ((z = zorro_find_device(ZORRO_PROD_BSC_OKTAGON_2008, z))) {
125 unsigned long board = z->resource.start;
126 if (request_mem_region(board+OKTAGON_ESP_ADDR,
127 sizeof(struct ESP_regs), "NCR53C9x")) {
129 * It is a SCSI controller.
130 * Hardwire Host adapter to SCSI ID 7
133 address = (unsigned long)ZTWO_VADDR(board);
134 eregs = (struct ESP_regs *)(address + OKTAGON_ESP_ADDR);
136 /* This line was 5 lines lower */
137 esp = esp_allocate(tpnt, (void *)board+OKTAGON_ESP_ADDR);
139 /* we have to shift the registers only one bit for oktagon */
142 esp_write(eregs->esp_cfg1, (ESP_CONFIG1_PENABLE | 7));
144 if (esp_read(eregs->esp_cfg1) != (ESP_CONFIG1_PENABLE | 7))
145 return 0; /* Bail out if address did not hold data */
147 /* Do command transfer with programmed I/O */
148 esp->do_pio_cmds = 1;
150 /* Required functions */
151 esp->dma_bytes_sent = &dma_bytes_sent;
152 esp->dma_can_transfer = &dma_can_transfer;
153 esp->dma_dump_state = &dma_dump_state;
154 esp->dma_init_read = &dma_init_read;
155 esp->dma_init_write = &dma_init_write;
156 esp->dma_ints_off = &dma_ints_off;
157 esp->dma_ints_on = &dma_ints_on;
158 esp->dma_irq_p = &dma_irq_p;
159 esp->dma_ports_p = &dma_ports_p;
160 esp->dma_setup = &dma_setup;
162 /* Optional functions */
163 esp->dma_barrier = 0;
165 esp->dma_invalidate = &dma_invalidate;
166 esp->dma_irq_entry = 0;
167 esp->dma_irq_exit = &dma_irq_exit;
168 esp->dma_led_on = &dma_led_on;
169 esp->dma_led_off = &dma_led_off;
173 esp->dma_mmu_get_scsi_one = &dma_mmu_get_scsi_one;
174 esp->dma_mmu_get_scsi_sgl = &dma_mmu_get_scsi_sgl;
175 esp->dma_mmu_release_scsi_one = &dma_mmu_release_scsi_one;
176 esp->dma_mmu_release_scsi_sgl = &dma_mmu_release_scsi_sgl;
177 esp->dma_advance_sg = &dma_advance_sg;
179 /* SCSI chip speed */
180 /* Looking at the quartz of the SCSI board... */
181 esp->cfreq = 25000000;
183 /* The DMA registers on the CyberStorm are mapped
184 * relative to the device (i.e. in the same Zorro
187 esp->dregs = (void *)(address + OKTAGON_DMA_ADDR);
189 paddress = (long *) esp->dregs;
191 /* ESP register base */
194 /* Set the command buffer */
195 esp->esp_command = (volatile unsigned char*) cmd_buffer;
197 /* Yes, the virtual address. See below. */
198 esp->esp_command_dvma = (__u32) cmd_buffer;
200 esp->irq = IRQ_AMIGA_PORTS;
201 request_irq(IRQ_AMIGA_PORTS, esp_intr, SA_SHIRQ,
202 "BSC Oktagon SCSI", esp->ehost);
204 /* Figure out our scsi ID on the bus */
207 /* We don't have a differential SCSI-bus. */
212 printk("ESP_Oktagon Driver 1.1"
213 #ifdef USE_BOTTOM_HALF
219 printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps,esps_in_use);
220 esps_running = esps_in_use;
222 register_reboot_notifier(&oktagon_notifier);
231 * On certain configurations the SCSI equipment gets confused on reboot,
232 * so we have to reset it then.
236 oktagon_notify_reboot(struct notifier_block *this, unsigned long code, void *x)
240 if((code == SYS_DOWN || code == SYS_HALT) && (esp = current_esp))
242 esp_bootup_reset(esp,esp->eregs);
243 udelay(500); /* Settle time. Maybe unnecessary. */
250 #ifdef USE_BOTTOM_HALF
254 * The bsc Oktagon controller has no real DMA, so we have to do the 'DMA
255 * transfer' in the interrupt (Yikes!) or use a bottom half to not to clutter
256 * IRQ's for longer-than-good.
259 * BIG PROBLEM: 'len' is usually the buffer length, not the expected length
260 * of the data. So DMA may finish prematurely, further reads lead to
261 * 'machine check' on APUS systems (don't know about m68k systems, AmigaOS
262 * deliberately ignores the bus faults) and a normal copy-loop can't
263 * be exited prematurely just at the right moment by the dma_invalidate IRQ.
264 * So do it the hard way, write an own copier in assembler and
265 * catch the exception.
270 static void dma_commit(void *opaque)
275 ESPDATA(("Transfer: %ld bytes, Address 0x%08lX, Direction: %d\n",
276 len,(long) address,direction));
277 dma_ints_off(current_esp);
281 if(direction) /* write? (memory to device) */
285 len2 = oktag_to_io(paddress, address+pos, len);
290 printk("Expedited DMA exit (writing) %ld\n",len);
297 len -= len2*sizeof(long);
302 len2 = oktag_from_io(address+pos, paddress, len);
307 printk("Expedited DMA exit (reading) %ld\n",len);
314 len -= len2*sizeof(long);
318 /* to make esp->shift work */
322 len2 = (esp_read(current_esp->eregs->esp_tclow) & 0xff) |
323 ((esp_read(current_esp->eregs->esp_tcmed) & 0xff) << 8);
326 * Uh uh. If you see this, len and transfer count registers were out of
327 * sync. That means really serious trouble.
331 printk("Eeeek!! Transfer count still %ld!\n",len2);
335 * Normally we just need to exit and wait for the interrupt to come.
336 * But at least one device (my Microtek ScanMaker 630) regularly mis-
337 * calculates the bytes it should send which is really ugly because
338 * it locks up the SCSI bus if not accounted for.
341 if(!(esp_read(current_esp->eregs->esp_status) & ESP_STAT_INTR))
347 * Interrupt bit was not set. Either the device is just plain lazy
348 * so we give it a 10 ms chance or...
350 while(len-- && (!(esp_read(current_esp->eregs->esp_status) & ESP_STAT_INTR)))
354 if(!(esp_read(current_esp->eregs->esp_status) & ESP_STAT_INTR))
357 * So we think that the transfer count is out of sync. Since we
358 * have all we want we are happy and can ditch the trash.
361 len = DMA_MAXTRANSFER;
363 while(len-- && (!(esp_read(current_esp->eregs->esp_status) & ESP_STAT_INTR)))
364 oktag_from_io(trash,paddress,2);
366 if(!(esp_read(current_esp->eregs->esp_status) & ESP_STAT_INTR))
369 * Things really have gone wrong. If we leave the system in that
370 * state, the SCSI bus is locked forever. I hope that this will
371 * turn the system in a more or less running state.
373 printk("Device is bolixed, trying bus reset...\n");
374 esp_bootup_reset(current_esp,current_esp->eregs);
379 ESPDATA(("Transfer_finale: do_data_finale should come\n"));
383 dma_ints_on(current_esp);
388 /************************************************************* DMA Functions */
389 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
391 /* Since the CyberStorm DMA is fully dedicated to the ESP chip,
392 * the number of bytes sent (to the ESP chip) equals the number
393 * of bytes in the FIFO - there is no buffering in the DMA controller.
394 * XXXX Do I read this right? It is from host to ESP, right?
399 static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp)
401 unsigned long sz = sp->SCp.this_residual;
402 if(sz > DMA_MAXTRANSFER)
403 sz = DMA_MAXTRANSFER;
407 static void dma_dump_state(struct NCR_ESP *esp)
412 * What the f$@& is this?
414 * Some SCSI devices (like my Microtek ScanMaker 630 scanner) want to transfer
415 * more data than requested. How much? Dunno. So ditch the bogus data into
416 * the sink, hoping the device will advance to the next phase sooner or later.
421 static long oktag_eva_buffer[16]; /* The data sink */
423 static void oktag_check_dma(void)
430 address = oktag_eva_buffer;
432 /* esp_do_data sets them to zero like len */
433 esp_write(current_esp->eregs->esp_tclow,2);
434 esp_write(current_esp->eregs->esp_tcmed,0);
438 static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length)
440 /* Zorro is noncached, everything else done using processor. */
441 /* cache_clear(addr, length); */
444 panic("dma_init_read while dma process is initialized/running!\n");
446 address = (long *) vaddress;
453 static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length)
455 /* cache_push(addr, length); */
458 panic("dma_init_write while dma process is initialized/running!\n");
460 address = (long *) vaddress;
467 static void dma_ints_off(struct NCR_ESP *esp)
469 disable_irq(esp->irq);
472 static void dma_ints_on(struct NCR_ESP *esp)
474 enable_irq(esp->irq);
477 static int dma_irq_p(struct NCR_ESP *esp)
479 /* It's important to check the DMA IRQ bit in the correct way! */
480 return (esp_read(esp->eregs->esp_status) & ESP_STAT_INTR);
483 static void dma_led_off(struct NCR_ESP *esp)
487 static void dma_led_on(struct NCR_ESP *esp)
491 static int dma_ports_p(struct NCR_ESP *esp)
493 return ((custom.intenar) & IF_PORTS);
496 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write)
498 /* On the Sparc, DMA_ST_WRITE means "move data from device to memory"
499 * so when (write) is true, it actually means READ!
502 dma_init_read(esp, addr, count);
504 dma_init_write(esp, addr, count);
509 * IRQ entry when DMA transfer is ready to be started
512 static void dma_irq_exit(struct NCR_ESP *esp)
514 #ifdef USE_BOTTOM_HALF
517 schedule_work(&tq_fake_dma);
520 while(len && !dma_irq_p(esp))
523 *paddress = *address++;
525 *address++ = *paddress;
526 len -= (sizeof(long));
534 * IRQ entry when DMA has just finished
537 static void dma_invalidate(struct NCR_ESP *esp)
542 * Since the processor does the data transfer we have to use the custom
543 * mmu interface to pass the virtual address, not the physical.
546 void dma_mmu_get_scsi_one(struct NCR_ESP *esp, Scsi_Cmnd *sp)
552 void dma_mmu_get_scsi_sgl(struct NCR_ESP *esp, Scsi_Cmnd *sp)
554 sp->SCp.ptr = page_address(sp->SCp.buffer->page)+
555 sp->SCp.buffer->offset;
558 void dma_mmu_release_scsi_one(struct NCR_ESP *esp, Scsi_Cmnd *sp)
562 void dma_mmu_release_scsi_sgl(struct NCR_ESP *esp, Scsi_Cmnd *sp)
566 void dma_advance_sg(Scsi_Cmnd *sp)
568 sp->SCp.ptr = page_address(sp->SCp.buffer->page)+
569 sp->SCp.buffer->offset;
575 int oktagon_esp_release(struct Scsi_Host *instance)
578 unsigned long address = (unsigned long)((struct NCR_ESP *)instance->hostdata)->edev;
580 release_mem_region(address, sizeof(struct ESP_regs));
581 free_irq(IRQ_AMIGA_PORTS, esp_intr);
582 unregister_reboot_notifier(&oktagon_notifier);
588 static Scsi_Host_Template driver_template = {
589 .proc_name = "esp-oktagon",
590 .proc_info = &esp_proc_info,
591 .name = "BSC Oktagon SCSI",
592 .detect = oktagon_esp_detect,
593 .slave_alloc = esp_slave_alloc,
594 .slave_destroy = esp_slave_destroy,
595 .release = oktagon_esp_release,
596 .queuecommand = esp_queue,
597 .eh_abort_handler = esp_abort,
598 .eh_bus_reset_handler = esp_reset,
601 .sg_tablesize = SG_ALL,
603 .use_clustering = ENABLE_CLUSTERING
607 #include "scsi_module.c"
609 MODULE_LICENSE("GPL");