1 /* sun3x_esp.c: EnhancedScsiProcessor Sun3x SCSI driver code.
3 * (C) 1999 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
5 * Based on David S. Miller's esp driver
8 #include <linux/kernel.h>
9 #include <linux/types.h>
10 #include <linux/string.h>
11 #include <linux/slab.h>
12 #include <linux/blkdev.h>
13 #include <linux/proc_fs.h>
14 #include <linux/stat.h>
15 #include <linux/delay.h>
16 #include <linux/interrupt.h>
19 #include <scsi/scsi_host.h>
22 #include <asm/sun3x.h>
26 extern struct NCR_ESP *espchain;
28 static void dma_barrier(struct NCR_ESP *esp);
29 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count);
30 static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp);
31 static void dma_drain(struct NCR_ESP *esp);
32 static void dma_invalidate(struct NCR_ESP *esp);
33 static void dma_dump_state(struct NCR_ESP *esp);
34 static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length);
35 static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length);
36 static void dma_ints_off(struct NCR_ESP *esp);
37 static void dma_ints_on(struct NCR_ESP *esp);
38 static int dma_irq_p(struct NCR_ESP *esp);
39 static void dma_poll(struct NCR_ESP *esp, unsigned char *vaddr);
40 static int dma_ports_p(struct NCR_ESP *esp);
41 static void dma_reset(struct NCR_ESP *esp);
42 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write);
43 static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp);
44 static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp);
45 static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp);
46 static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp);
47 static void dma_advance_sg (Scsi_Cmnd *sp);
49 /* Detecting ESP chips on the machine. This is the simple and easy
52 int sun3x_esp_detect(Scsi_Host_Template *tpnt)
55 struct ConfigDev *esp_dev;
58 esp = esp_allocate(tpnt, (void *) esp_dev);
60 /* Do command transfer with DMA */
63 /* Required functions */
64 esp->dma_bytes_sent = &dma_bytes_sent;
65 esp->dma_can_transfer = &dma_can_transfer;
66 esp->dma_dump_state = &dma_dump_state;
67 esp->dma_init_read = &dma_init_read;
68 esp->dma_init_write = &dma_init_write;
69 esp->dma_ints_off = &dma_ints_off;
70 esp->dma_ints_on = &dma_ints_on;
71 esp->dma_irq_p = &dma_irq_p;
72 esp->dma_ports_p = &dma_ports_p;
73 esp->dma_setup = &dma_setup;
75 /* Optional functions */
76 esp->dma_barrier = &dma_barrier;
77 esp->dma_invalidate = &dma_invalidate;
78 esp->dma_drain = &dma_drain;
79 esp->dma_irq_entry = 0;
80 esp->dma_irq_exit = 0;
83 esp->dma_poll = &dma_poll;
84 esp->dma_reset = &dma_reset;
86 /* virtual DMA functions */
87 esp->dma_mmu_get_scsi_one = &dma_mmu_get_scsi_one;
88 esp->dma_mmu_get_scsi_sgl = &dma_mmu_get_scsi_sgl;
89 esp->dma_mmu_release_scsi_one = &dma_mmu_release_scsi_one;
90 esp->dma_mmu_release_scsi_sgl = &dma_mmu_release_scsi_sgl;
91 esp->dma_advance_sg = &dma_advance_sg;
94 esp->cfreq = 20000000;
95 esp->eregs = (struct ESP_regs *)(SUN3X_ESP_BASE);
96 esp->dregs = (void *)SUN3X_ESP_DMA;
98 esp->esp_command = (volatile unsigned char *)dvma_malloc(DVMA_PAGE_SIZE);
99 esp->esp_command_dvma = dvma_vtob((unsigned long)esp->esp_command);
102 if (request_irq(esp->irq, esp_intr, SA_INTERRUPT,
103 "SUN3X SCSI", esp->ehost)) {
113 /* for reasons beyond my knowledge (and which should likely be fixed)
114 sync mode doesn't work on a 3/80 at 5mhz. but it does at 4. */
115 esp->sync_defp = 0x3f;
117 printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps,
119 esps_running = esps_in_use;
123 static void dma_do_drain(struct NCR_ESP *esp)
125 struct sparc_dma_registers *dregs =
126 (struct sparc_dma_registers *) esp->dregs;
130 while((dregs->cond_reg & DMA_PEND_READ) && (--count > 0))
134 printk("%s:%d timeout CSR %08lx\n", __FILE__, __LINE__, dregs->cond_reg);
137 dregs->cond_reg |= DMA_FIFO_STDRAIN;
141 while((dregs->cond_reg & DMA_FIFO_ISDRAIN) && (--count > 0))
145 printk("%s:%d timeout CSR %08lx\n", __FILE__, __LINE__, dregs->cond_reg);
150 static void dma_barrier(struct NCR_ESP *esp)
152 struct sparc_dma_registers *dregs =
153 (struct sparc_dma_registers *) esp->dregs;
156 while((dregs->cond_reg & DMA_PEND_READ) && (--count > 0))
160 printk("%s:%d timeout CSR %08lx\n", __FILE__, __LINE__, dregs->cond_reg);
163 dregs->cond_reg &= ~(DMA_ENABLE);
166 /* This uses various DMA csr fields and the fifo flags count value to
167 * determine how many bytes were successfully sent/received by the ESP.
169 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
171 struct sparc_dma_registers *dregs =
172 (struct sparc_dma_registers *) esp->dregs;
174 int rval = dregs->st_addr - esp->esp_command_dvma;
176 return rval - fifo_count;
179 static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp)
181 return sp->SCp.this_residual;
184 static void dma_drain(struct NCR_ESP *esp)
186 struct sparc_dma_registers *dregs =
187 (struct sparc_dma_registers *) esp->dregs;
190 if(dregs->cond_reg & DMA_FIFO_ISDRAIN) {
191 dregs->cond_reg |= DMA_FIFO_STDRAIN;
192 while((dregs->cond_reg & DMA_FIFO_ISDRAIN) && (--count > 0))
195 printk("%s:%d timeout CSR %08lx\n", __FILE__, __LINE__, dregs->cond_reg);
201 static void dma_invalidate(struct NCR_ESP *esp)
203 struct sparc_dma_registers *dregs =
204 (struct sparc_dma_registers *) esp->dregs;
209 while(((tmp = dregs->cond_reg) & DMA_PEND_READ) && (--count > 0))
213 printk("%s:%d timeout CSR %08lx\n", __FILE__, __LINE__, dregs->cond_reg);
216 dregs->cond_reg = tmp | DMA_FIFO_INV;
217 dregs->cond_reg &= ~DMA_FIFO_INV;
221 static void dma_dump_state(struct NCR_ESP *esp)
223 struct sparc_dma_registers *dregs =
224 (struct sparc_dma_registers *) esp->dregs;
226 ESPLOG(("esp%d: dma -- cond_reg<%08lx> addr<%08lx>\n",
227 esp->esp_id, dregs->cond_reg, dregs->st_addr));
230 static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length)
232 struct sparc_dma_registers *dregs =
233 (struct sparc_dma_registers *) esp->dregs;
235 dregs->st_addr = vaddress;
236 dregs->cond_reg |= (DMA_ST_WRITE | DMA_ENABLE);
239 static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length)
241 struct sparc_dma_registers *dregs =
242 (struct sparc_dma_registers *) esp->dregs;
244 /* Set up the DMA counters */
246 dregs->st_addr = vaddress;
247 dregs->cond_reg = ((dregs->cond_reg & ~(DMA_ST_WRITE)) | DMA_ENABLE);
250 static void dma_ints_off(struct NCR_ESP *esp)
252 DMA_INTSOFF((struct sparc_dma_registers *) esp->dregs);
255 static void dma_ints_on(struct NCR_ESP *esp)
257 DMA_INTSON((struct sparc_dma_registers *) esp->dregs);
260 static int dma_irq_p(struct NCR_ESP *esp)
262 return DMA_IRQ_P((struct sparc_dma_registers *) esp->dregs);
265 static void dma_poll(struct NCR_ESP *esp, unsigned char *vaddr)
270 /* Wait till the first bits settle. */
271 while((*(volatile unsigned char *)vaddr == 0xff) && (--count > 0))
275 // printk("%s:%d timeout expire (data %02x)\n", __FILE__, __LINE__,
276 // esp_read(esp->eregs->esp_fdata));
278 vaddr[0] = esp_read(esp->eregs->esp_fdata);
279 vaddr[1] = esp_read(esp->eregs->esp_fdata);
284 static int dma_ports_p(struct NCR_ESP *esp)
286 return (((struct sparc_dma_registers *) esp->dregs)->cond_reg
290 /* Resetting various pieces of the ESP scsi driver chipset/buses. */
291 static void dma_reset(struct NCR_ESP *esp)
293 struct sparc_dma_registers *dregs =
294 (struct sparc_dma_registers *)esp->dregs;
296 /* Punt the DVMA into a known state. */
297 dregs->cond_reg |= DMA_RST_SCSI;
298 dregs->cond_reg &= ~(DMA_RST_SCSI);
302 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write)
304 struct sparc_dma_registers *dregs =
305 (struct sparc_dma_registers *) esp->dregs;
306 unsigned long nreg = dregs->cond_reg;
308 // printk("dma_setup %c addr %08x cnt %08x\n",
309 // write ? 'W' : 'R', addr, count);
314 nreg |= DMA_ST_WRITE;
316 nreg &= ~(DMA_ST_WRITE);
320 dregs->cond_reg = nreg;
321 dregs->st_addr = addr;
324 static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp)
326 sp->SCp.have_data_in = dvma_map((unsigned long)sp->SCp.buffer,
327 sp->SCp.this_residual);
328 sp->SCp.ptr = (char *)((unsigned long)sp->SCp.have_data_in);
331 static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp)
333 int sz = sp->SCp.buffers_residual;
334 struct scatterlist *sg = sp->SCp.buffer;
337 sg[sz].dvma_address = dvma_map((unsigned long)page_address(sg[sz].page) +
338 sg[sz].offset, sg[sz].length);
341 sp->SCp.ptr=(char *)((unsigned long)sp->SCp.buffer->dvma_address);
344 static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp)
346 dvma_unmap((char *)sp->SCp.have_data_in);
349 static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp)
351 int sz = sp->use_sg - 1;
352 struct scatterlist *sg = (struct scatterlist *)sp->buffer;
355 dvma_unmap((char *)sg[sz].dvma_address);
360 static void dma_advance_sg (Scsi_Cmnd *sp)
362 sp->SCp.ptr = (char *)((unsigned long)sp->SCp.buffer->dvma_address);
365 static int sun3x_esp_release(struct Scsi_Host *instance)
367 /* this code does not support being compiled as a module */
372 static Scsi_Host_Template driver_template = {
373 .proc_name = "sun3x_esp",
374 .proc_info = &esp_proc_info,
375 .name = "Sun ESP 100/100a/200",
376 .detect = sun3x_esp_detect,
377 .release = sun3x_esp_release,
378 .slave_alloc = esp_slave_alloc,
379 .slave_destroy = esp_slave_destroy,
381 .queuecommand = esp_queue,
382 .eh_abort_handler = esp_abort,
383 .eh_bus_reset_handler = esp_reset,
386 .sg_tablesize = SG_ALL,
388 .use_clustering = DISABLE_CLUSTERING,
392 #include "scsi_module.c"
394 MODULE_LICENSE("GPL");