patch-2.3.22 linux/drivers/scsi/dec_esp.c

• Lines: 352
• Date: Wed Oct 13 10:32:35 1999
• Orig file: v2.3.21/linux/drivers/scsi/dec_esp.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.21/linux/drivers/scsi/dec_esp.c linux/drivers/scsi/dec_esp.c
@@ -0,0 +1,351 @@
+/*
+ * dec_esp.c: Driver for SCSI chips on IOASIC based TURBOchannel DECstations
+ *
+ * TURBOchannel changes by Harald Koerfgen
+ *
+ * based on jazz_esp.c:
+ * Copyright (C) 1997 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
+ *
+ * jazz_esp is based on David S. Miller's ESP driver and cyber_esp
+ */
+
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/malloc.h>
+#include <linux/blk.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+
+#include "scsi.h"
+#include "hosts.h"
+#include "NCR53C9x.h"
+#include "dec_esp.h"
+
+#include <asm/irq.h>
+#include <asm/jazz.h>
+#include <asm/jazzdma.h>
+#include <asm/dma.h>
+
+#include <asm/pgtable.h>
+
+#include <asm/dec/tc.h>
+#include <asm/dec/interrupts.h>
+#include <asm/dec/ioasic_addrs.h>
+#include <asm/dec/ioasic_ints.h>
+#include <asm/dec/machtype.h>
+
+static int  dma_bytes_sent(struct NCR_ESP *esp, int fifo_count);
+static void dma_drain(struct NCR_ESP *esp);
+static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd * sp);
+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 int  dma_ports_p(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_advance_sg(Scsi_Cmnd * sp);
+
+
+volatile unsigned char cmd_buffer[16];
+				/* This is where all commands are put
+				 * before they are trasfered to the ESP chip
+				 * via PIO.
+				 */
+
+volatile unsigned long *scsi_dma_ptr;
+volatile unsigned long *scsi_next_ptr;
+volatile unsigned long *scsi_scr;
+volatile unsigned long *ioasic_ssr;
+volatile unsigned long *scsi_sdr0;
+volatile unsigned long *scsi_sdr1;
+
+static void scsi_dma_int(int, void *, struct pt_regs *);
+
+/***************************************************************** Detection */
+int dec_esp_detect(Scsi_Host_Template * tpnt)
+{
+    struct NCR_ESP *esp;
+    struct ConfigDev *esp_dev;
+
+	if (IOASIC) {
+	esp_dev = 0;
+	esp = esp_allocate(tpnt, (void *) esp_dev);
+	
+		scsi_dma_ptr = (unsigned long *) (system_base + IOCTL + SCSI_DMA_P);
+		scsi_next_ptr = (unsigned long *) (system_base + IOCTL + SCSI_DMA_BP);
+		scsi_scr = (unsigned long *) (system_base + IOCTL + SCSI_SCR);
+		ioasic_ssr = (unsigned long *) (system_base + IOCTL + SSR);
+		scsi_sdr0 = (unsigned long *) (system_base + IOCTL + SCSI_SDR0);
+		scsi_sdr1 = (unsigned long *) (system_base + IOCTL + SCSI_SDR1);
+
+	/* Do command transfer with programmed I/O */
+	esp->do_pio_cmds = 1;
+	
+	/* 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 = 0;
+		esp->dma_drain = &dma_drain;
+	esp->dma_invalidate = 0;
+	esp->dma_irq_entry = 0;
+	esp->dma_irq_exit = 0;
+	esp->dma_poll = 0;
+	esp->dma_reset = 0;
+	esp->dma_led_off = 0;
+	esp->dma_led_on = 0;
+	
+	/* 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 = 0;
+		esp->dma_mmu_release_scsi_sgl = 0;
+	esp->dma_advance_sg = &dma_advance_sg;
+
+
+	/* SCSI chip speed */
+		esp->cfreq = 25000000;
+
+	/* 
+	 * we don't give the address of DMA channel, but the number
+	 * of DMA channel, so we can use the jazz DMA functions
+	 * 
+	 */
+	esp->dregs = JAZZ_SCSI_DMA;
+	
+	/* ESP register base */
+		esp->eregs = (struct ESP_regs *) (system_base + SCSI);
+	
+	/* Set the command buffer */
+		esp->esp_command = (volatile unsigned char *) cmd_buffer;
+	
+	/* get virtual dma address for command buffer */
+		esp->esp_command_dvma = KSEG1ADDR((volatile unsigned char *) cmd_buffer);
+	
+		esp->irq = SCSI_INT;
+	request_irq(esp->irq, esp_intr, SA_INTERRUPT, "NCR 53C94 SCSI",
+	            NULL);
+		request_irq(SCSI_DMA_INT, scsi_dma_int, SA_INTERRUPT, "JUNKIO SCSI DMA",
+			    NULL);
+
+	/*
+	 * FIXME, look if the scsi id is availabe from NVRAM
+	 */
+	esp->scsi_id = 7;
+		
+	/* Check for differential SCSI-bus */
+	/* What is this stuff? */
+	esp->diff = 0;
+
+	esp_initialize(esp);
+	
+		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;
+    }
+    return 0;
+}
+
+/************************************************************* DMA Functions */
+static void scsi_dma_int(int irq, void *dev_id, struct pt_regs *regs)
+{
+	extern volatile unsigned int *isr;
+	unsigned int dummy;
+
+	if (*isr & SCSI_PTR_LOADED) {
+		/* next page */
+		*scsi_next_ptr = ((*scsi_dma_ptr + PAGE_SIZE) & PAGE_MASK) << 3;
+		*isr &= ~SCSI_PTR_LOADED;
+	} else {
+		printk("Got unexpected SCSI DMA Interrupt! < ");
+		if (*isr & SCSI_PAGOVRRUN)
+			printk("SCSI_PAGOVRRUN ");
+		if (*isr & SCSI_DMA_MEMRDERR)
+			printk("SCSI_DMA_MEMRDERR ");
+		printk(">\n");
+//		panic("stop");
+		*isr &= ~(SCSI_PAGOVRRUN || SCSI_DMA_MEMRDERR);
+	}
+
+	/*
+	 * This driver will only work on IOASIC machines
+	 * so we can avoid an indirect function call here
+	 * and flush the writeback buffer the fast way
+	 */
+	dummy = *isr;
+	dummy = *isr;
+}
+
+static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
+{
+    return fifo_count;
+}
+
+static void dma_drain(struct NCR_ESP *esp)
+{
+	unsigned long nw;
+	unsigned short *p = KSEG1ADDR((unsigned short *) ((*scsi_dma_ptr) >> 3));
+
+    /*
+	 * Is there something in the dma buffers left?
+     */
+	if (nw = *scsi_scr) {
+		switch (nw) {
+		case 1:
+			*p = (unsigned short) *scsi_sdr0;
+			break;
+		case 2:
+			*p++ = (unsigned short) (*scsi_sdr0);
+			*p = (unsigned short) ((*scsi_sdr0) >> 16);
+			break;
+		case 3:
+			*p++ = (unsigned short) (*scsi_sdr0);
+			*p++ = (unsigned short) ((*scsi_sdr0) >> 16);
+			*p = (unsigned short) (*scsi_sdr1);
+			break;
+		default:
+			printk("Strange: %d words in dma buffer left\n", (int) nw);
+			break;
+		}
+	}
+}
+
+static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd * sp)
+{
+	return sp->SCp.this_residual;;
+}
+    
+static void dma_dump_state(struct NCR_ESP *esp)
+{
+/*    
+    ESPLOG(("esp%d: dma -- enable <%08x> residue <%08x\n",
+	    esp->esp_id, vdma_get_enable((int)esp->dregs), vdma_get_resdiue((int)esp->dregs)));
+ */
+}
+
+static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length)
+{
+	extern volatile unsigned int *isr;
+	unsigned int dummy;
+
+	if (vaddress & 3)
+		panic("dec_efs.c: unable to handle partial word transfers, yet...");
+
+	dma_cache_wback_inv((unsigned long) phys_to_virt(vaddress), length);
+
+	*ioasic_ssr &= ~SCSI_DMA_EN;
+	*scsi_scr = 0;
+	*scsi_dma_ptr = vaddress << 3;
+
+	/* prepare for next page */
+	*scsi_next_ptr = ((vaddress + PAGE_SIZE) & PAGE_MASK) << 3;
+	*ioasic_ssr |= (SCSI_DMA_DIR | SCSI_DMA_EN);
+
+	/*
+	 * see above
+	 */
+	dummy = *isr;
+	dummy = *isr;
+}
+
+static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length)
+{
+	extern volatile unsigned int *isr;
+	unsigned int dummy;
+
+	if (vaddress & 3)
+		panic("dec_efs.c: unable to handle partial word transfers, yet...");
+
+	dma_cache_wback_inv((unsigned long) phys_to_virt(vaddress), length);
+
+	*ioasic_ssr &= ~(SCSI_DMA_DIR | SCSI_DMA_EN);
+	*scsi_scr = 0;
+	*scsi_dma_ptr = vaddress << 3;
+
+	/* prepare for next page */
+	*scsi_next_ptr = ((vaddress + PAGE_SIZE) & PAGE_MASK) << 3;
+	*ioasic_ssr |= SCSI_DMA_EN;
+
+	/*
+	 * see above
+	 */
+	dummy = *isr;
+	dummy = *isr;
+}
+
+static void dma_ints_off(struct NCR_ESP *esp)
+{
+	disable_irq(SCSI_DMA_INT);
+}
+
+static void dma_ints_on(struct NCR_ESP *esp)
+{
+	enable_irq(SCSI_DMA_INT);
+}
+
+static int dma_irq_p(struct NCR_ESP *esp)
+{
+    return (esp->eregs->esp_status & ESP_STAT_INTR);
+}
+
+static int dma_ports_p(struct NCR_ESP *esp)
+{
+/*
+ * FIXME: what's this good for?
+ */
+	return 1;
+}
+
+static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write)
+{
+    /* 
+     * On the Sparc, DMA_ST_WRITE means "move data from device to memory"
+     * so when (write) is true, it actually means READ!
+     */
+	if (write) {
+	dma_init_read(esp, addr, count);
+    } else {
+	dma_init_write(esp, addr, count);
+    }
+}
+
+/*
+ * These aren't used yet
+ */
+static void dma_mmu_get_scsi_one(struct NCR_ESP *esp, Scsi_Cmnd * sp)
+{
+	sp->SCp.have_data_in = PHYSADDR(sp->SCp.buffer);
+	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 mmu_sglist *sg = (struct mmu_sglist *) sp->SCp.buffer;
+    
+    while (sz >= 0) {
+		sg[sz].dvma_addr = PHYSADDR(sg[sz].addr);
+	sz--;
+    }
+	sp->SCp.ptr = (char *) ((unsigned long) sp->SCp.buffer->dvma_address);
+}
+
+static void dma_advance_sg(Scsi_Cmnd * sp)
+{    
+	sp->SCp.ptr = (char *) ((unsigned long) sp->SCp.buffer->dvma_address);
+}