sun3x_esp.c 10.2 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49
/* sun3x_esp.c:  EnhancedScsiProcessor Sun3x SCSI driver code.
 *
 * (C) 1999 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
 *
 * Based on David S. Miller's esp driver
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/delay.h>
#include <linux/interrupt.h>

#include "scsi.h"
#include <scsi/scsi_host.h>
#include "NCR53C9x.h"

#include <asm/sun3x.h>
#include <asm/dvma.h>
#include <asm/irq.h>

static void dma_barrier(struct NCR_ESP *esp);
static int  dma_bytes_sent(struct NCR_ESP *esp, int fifo_count);
static int  dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp);
static void dma_drain(struct NCR_ESP *esp);
static void dma_invalidate(struct NCR_ESP *esp);
static void dma_dump_state(struct NCR_ESP *esp);
static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length);
static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length);
static void dma_ints_off(struct NCR_ESP *esp);
static void dma_ints_on(struct NCR_ESP *esp);
static int  dma_irq_p(struct NCR_ESP *esp);
static void dma_poll(struct NCR_ESP *esp, unsigned char *vaddr);
static int  dma_ports_p(struct NCR_ESP *esp);
static void dma_reset(struct NCR_ESP *esp);
static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write);
static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp);
static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp);
static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp);
static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp);
static void dma_advance_sg (Scsi_Cmnd *sp);

/* Detecting ESP chips on the machine.  This is the simple and easy
 * version.
 */
50
int sun3x_esp_detect(struct scsi_host_template *tpnt)
L
Linus Torvalds 已提交
51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334
{
	struct NCR_ESP *esp;
	struct ConfigDev *esp_dev;

	esp_dev = 0;
	esp = esp_allocate(tpnt, (void *) esp_dev);

	/* Do command transfer with DMA */
	esp->do_pio_cmds = 0;

	/* Required functions */
	esp->dma_bytes_sent = &dma_bytes_sent;
	esp->dma_can_transfer = &dma_can_transfer;
	esp->dma_dump_state = &dma_dump_state;
	esp->dma_init_read = &dma_init_read;
	esp->dma_init_write = &dma_init_write;
	esp->dma_ints_off = &dma_ints_off;
	esp->dma_ints_on = &dma_ints_on;
	esp->dma_irq_p = &dma_irq_p;
	esp->dma_ports_p = &dma_ports_p;
	esp->dma_setup = &dma_setup;

	/* Optional functions */
	esp->dma_barrier = &dma_barrier;
	esp->dma_invalidate = &dma_invalidate;
	esp->dma_drain = &dma_drain;
	esp->dma_irq_entry = 0;
	esp->dma_irq_exit = 0;
	esp->dma_led_on = 0;
	esp->dma_led_off = 0;
	esp->dma_poll = &dma_poll;
	esp->dma_reset = &dma_reset;

        /* virtual DMA functions */
        esp->dma_mmu_get_scsi_one = &dma_mmu_get_scsi_one;
        esp->dma_mmu_get_scsi_sgl = &dma_mmu_get_scsi_sgl;
        esp->dma_mmu_release_scsi_one = &dma_mmu_release_scsi_one;
        esp->dma_mmu_release_scsi_sgl = &dma_mmu_release_scsi_sgl;
        esp->dma_advance_sg = &dma_advance_sg;
	    
	/* SCSI chip speed */
	esp->cfreq = 20000000;
	esp->eregs = (struct ESP_regs *)(SUN3X_ESP_BASE);
	esp->dregs = (void *)SUN3X_ESP_DMA;

	esp->esp_command = (volatile unsigned char *)dvma_malloc(DVMA_PAGE_SIZE);
	esp->esp_command_dvma = dvma_vtob((unsigned long)esp->esp_command);

	esp->irq = 2;
	if (request_irq(esp->irq, esp_intr, SA_INTERRUPT, 
			"SUN3X SCSI", esp->ehost)) {
		esp_deallocate(esp);
		return 0;
	}

	esp->scsi_id = 7;
	esp->diff = 0;

	esp_initialize(esp);

 	/* for reasons beyond my knowledge (and which should likely be fixed)
 	   sync mode doesn't work on a 3/80 at 5mhz.  but it does at 4. */
 	esp->sync_defp = 0x3f;

	printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps,
	       esps_in_use);
	esps_running = esps_in_use;
	return esps_in_use;
}

static void dma_do_drain(struct NCR_ESP *esp)
{
 	struct sparc_dma_registers *dregs =
 		(struct sparc_dma_registers *) esp->dregs;
 	
 	int count = 500000;
 
 	while((dregs->cond_reg & DMA_PEND_READ) && (--count > 0)) 
 		udelay(1);
 
 	if(!count) {
 		printk("%s:%d timeout CSR %08lx\n", __FILE__, __LINE__, dregs->cond_reg);
 	}
 
 	dregs->cond_reg |= DMA_FIFO_STDRAIN;
 	
 	count = 500000;
 
 	while((dregs->cond_reg & DMA_FIFO_ISDRAIN) && (--count > 0)) 
 		udelay(1);
 
 	if(!count) {
 		printk("%s:%d timeout CSR %08lx\n", __FILE__, __LINE__, dregs->cond_reg);
 	}
 
}
 
static void dma_barrier(struct NCR_ESP *esp)
{
  	struct sparc_dma_registers *dregs =
  		(struct sparc_dma_registers *) esp->dregs;
 	int count = 500000;
  
 	while((dregs->cond_reg & DMA_PEND_READ) && (--count > 0))
  		udelay(1);
 
 	if(!count) {
 		printk("%s:%d timeout CSR %08lx\n", __FILE__, __LINE__, dregs->cond_reg);
 	}
 
  	dregs->cond_reg &= ~(DMA_ENABLE);
}

/* This uses various DMA csr fields and the fifo flags count value to
 * determine how many bytes were successfully sent/received by the ESP.
 */
static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
{
	struct sparc_dma_registers *dregs = 
		(struct sparc_dma_registers *) esp->dregs;

	int rval = dregs->st_addr - esp->esp_command_dvma;

	return rval - fifo_count;
}

static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp)
{
	return sp->SCp.this_residual;
}

static void dma_drain(struct NCR_ESP *esp)
{
	struct sparc_dma_registers *dregs =
		(struct sparc_dma_registers *) esp->dregs;
	int count = 500000;

	if(dregs->cond_reg & DMA_FIFO_ISDRAIN) {
		dregs->cond_reg |= DMA_FIFO_STDRAIN;
		while((dregs->cond_reg & DMA_FIFO_ISDRAIN) && (--count > 0))
			udelay(1);
		if(!count) {
			printk("%s:%d timeout CSR %08lx\n", __FILE__, __LINE__, dregs->cond_reg);
		}

	}
}

static void dma_invalidate(struct NCR_ESP *esp)
{
	struct sparc_dma_registers *dregs =
		(struct sparc_dma_registers *) esp->dregs;

	__u32 tmp;
	int count = 500000;

	while(((tmp = dregs->cond_reg) & DMA_PEND_READ) && (--count > 0)) 
		udelay(1);

	if(!count) {
		printk("%s:%d timeout CSR %08lx\n", __FILE__, __LINE__, dregs->cond_reg);
	}

	dregs->cond_reg = tmp | DMA_FIFO_INV;
	dregs->cond_reg &= ~DMA_FIFO_INV;

}

static void dma_dump_state(struct NCR_ESP *esp)
{
	struct sparc_dma_registers *dregs =
		(struct sparc_dma_registers *) esp->dregs;

	ESPLOG(("esp%d: dma -- cond_reg<%08lx> addr<%08lx>\n",
		esp->esp_id, dregs->cond_reg, dregs->st_addr));
}

static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length)
{
	struct sparc_dma_registers *dregs = 
		(struct sparc_dma_registers *) esp->dregs;

	dregs->st_addr = vaddress;
	dregs->cond_reg |= (DMA_ST_WRITE | DMA_ENABLE);
}

static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length)
{
	struct sparc_dma_registers *dregs = 
		(struct sparc_dma_registers *) esp->dregs;

	/* Set up the DMA counters */

	dregs->st_addr = vaddress;
	dregs->cond_reg = ((dregs->cond_reg & ~(DMA_ST_WRITE)) | DMA_ENABLE);
}

static void dma_ints_off(struct NCR_ESP *esp)
{
	DMA_INTSOFF((struct sparc_dma_registers *) esp->dregs);
}

static void dma_ints_on(struct NCR_ESP *esp)
{
	DMA_INTSON((struct sparc_dma_registers *) esp->dregs);
}

static int dma_irq_p(struct NCR_ESP *esp)
{
	return DMA_IRQ_P((struct sparc_dma_registers *) esp->dregs);
}

static void dma_poll(struct NCR_ESP *esp, unsigned char *vaddr)
{
	int count = 50;
	dma_do_drain(esp);

	/* Wait till the first bits settle. */
	while((*(volatile unsigned char *)vaddr == 0xff) && (--count > 0))
		udelay(1);

	if(!count) {
//		printk("%s:%d timeout expire (data %02x)\n", __FILE__, __LINE__,
//		       esp_read(esp->eregs->esp_fdata));
		//mach_halt();
		vaddr[0] = esp_read(esp->eregs->esp_fdata);
		vaddr[1] = esp_read(esp->eregs->esp_fdata);
	}

}	

static int dma_ports_p(struct NCR_ESP *esp)
{
	return (((struct sparc_dma_registers *) esp->dregs)->cond_reg 
			& DMA_INT_ENAB);
}

/* Resetting various pieces of the ESP scsi driver chipset/buses. */
static void dma_reset(struct NCR_ESP *esp)
{
	struct sparc_dma_registers *dregs =
		(struct sparc_dma_registers *)esp->dregs;

	/* Punt the DVMA into a known state. */
	dregs->cond_reg |= DMA_RST_SCSI;
	dregs->cond_reg &= ~(DMA_RST_SCSI);
	DMA_INTSON(dregs);
}

static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write)
{
	struct sparc_dma_registers *dregs = 
		(struct sparc_dma_registers *) esp->dregs;
	unsigned long nreg = dregs->cond_reg;

//	printk("dma_setup %c addr %08x cnt %08x\n",
//	       write ? 'W' : 'R', addr, count);

	dma_do_drain(esp);

	if(write)
		nreg |= DMA_ST_WRITE;
	else {
		nreg &= ~(DMA_ST_WRITE);
	}
		
	nreg |= DMA_ENABLE;
	dregs->cond_reg = nreg;
	dregs->st_addr = addr;
}

static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp)
{
    sp->SCp.have_data_in = dvma_map((unsigned long)sp->SCp.buffer,
				       sp->SCp.this_residual);
    sp->SCp.ptr = (char *)((unsigned long)sp->SCp.have_data_in);
}

static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp)
{
    int sz = sp->SCp.buffers_residual;
    struct scatterlist *sg = sp->SCp.buffer;

    while (sz >= 0) {
335
	    sg[sz].dma_address = dvma_map((unsigned long)page_address(sg[sz].page) +
L
Linus Torvalds 已提交
336 337 338
					   sg[sz].offset, sg[sz].length);
	    sz--;
    }
339
    sp->SCp.ptr=(char *)((unsigned long)sp->SCp.buffer->dma_address);
L
Linus Torvalds 已提交
340 341 342 343 344 345 346 347 348 349 350 351 352
}

static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp)
{
    dvma_unmap((char *)sp->SCp.have_data_in);
}

static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp)
{
    int sz = sp->use_sg - 1;
    struct scatterlist *sg = (struct scatterlist *)sp->buffer;
                        
    while(sz >= 0) {
353
        dvma_unmap((char *)sg[sz].dma_address);
L
Linus Torvalds 已提交
354 355 356 357 358 359
        sz--;
    }
}

static void dma_advance_sg (Scsi_Cmnd *sp)
{
360
    sp->SCp.ptr = (char *)((unsigned long)sp->SCp.buffer->dma_address);
L
Linus Torvalds 已提交
361 362 363 364 365 366 367 368 369
}

static int sun3x_esp_release(struct Scsi_Host *instance)
{
	/* this code does not support being compiled as a module */	 
	return 1;

}

370
static struct scsi_host_template driver_template = {
L
Linus Torvalds 已提交
371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392
	.proc_name		= "sun3x_esp",
	.proc_info		= &esp_proc_info,
	.name			= "Sun ESP 100/100a/200",
	.detect			= sun3x_esp_detect,
	.release                = sun3x_esp_release,
	.slave_alloc		= esp_slave_alloc,
	.slave_destroy		= esp_slave_destroy,
	.info			= esp_info,
	.queuecommand		= esp_queue,
	.eh_abort_handler	= esp_abort,
	.eh_bus_reset_handler	= esp_reset,
	.can_queue		= 7,
	.this_id		= 7,
	.sg_tablesize		= SG_ALL,
	.cmd_per_lun		= 1,
	.use_clustering		= DISABLE_CLUSTERING,
};


#include "scsi_module.c"

MODULE_LICENSE("GPL");