patch-2.1.101 linux/drivers/scsi/fastlane.c

• Lines: 344
• Date: Fri May 8 00:22:12 1998
• Orig file: v2.1.100/linux/drivers/scsi/fastlane.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.100/linux/drivers/scsi/fastlane.c linux/drivers/scsi/fastlane.c
@@ -0,0 +1,343 @@
+/* fastlane.c: Driver for Phase5's Fastlane SCSI Controller.
+ *
+ * Copyright (C) 1996 Jesper Skov (jskov@cygnus.co.uk)
+ *
+ * This driver is based on the CyberStorm driver, hence the occasional
+ * reference to CyberStorm.
+ *
+ * Betatesting & crucial adjustments by Patrik Rak 
+ * (prak3264@ss1000.ms.mff.cuni.cz)
+ *
+ */
+
+/* TODO:
+ *
+ * o According to the doc from laire, it is required to reset the DMA when
+ *   the transfer is done. ATM we reset DMA just before every new 
+ *   dma_init_(read|write).
+ *
+ * 1) Figure out how to make a cleaner merge with the sparc driver with regard
+ *    to the caches and the Sparc MMU mapping.
+ * 2) Make as few routines required outside the generic driver. A lot of the
+ *    routines in this file used to be inline!
+ */
+
+#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 "fastlane.h"
+
+#include <linux/zorro.h>
+#include <asm/irq.h>
+#include <asm/amigaints.h>
+#include <asm/amigahw.h>
+
+#include <asm/pgtable.h>
+
+/* Let this defined unless you really need to enable DMA IRQ one day */
+#define NODMAIRQ
+
+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 inline void dma_clear(struct NCR_ESP *esp);
+static void dma_dump_state(struct NCR_ESP *esp);
+static void dma_init_read(struct NCR_ESP *esp, __u32 addr, int length);
+static void dma_init_write(struct NCR_ESP *esp, __u32 vaddr, 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_led_off(struct NCR_ESP *esp);
+static void dma_led_on(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 unsigned char ctrl_data = 0;	/* Keep backup of the stuff written
+				 * to ctrl_reg. Always write a copy
+				 * to this register when writing to
+				 * the hardware register!
+				 */
+
+volatile unsigned char cmd_buffer[16];
+				/* This is where all commands are put
+				 * before they are trasfered to the ESP chip
+				 * via PIO.
+				 */
+
+/***************************************************************** Detection */
+int fastlane_esp_detect(Scsi_Host_Template *tpnt)
+{
+	struct NCR_ESP *esp;
+	const struct ConfigDev *esp_dev;
+	unsigned int key;
+	unsigned long address;
+
+	if ((key = zorro_find(ZORRO_PROD_PHASE5_BLIZZARD_1230_II_FASTLANE_Z3_CYBERSCSI_CYBERSTORM060, 0, 0))){
+
+		esp_dev = zorro_get_board(key);
+
+		/* Check if this is really a fastlane controller. The problem
+		 * is that also the cyberstorm and blizzard controllers use
+		 * this ID value. Fortunately only Fastlane maps in Z3 space
+		 */
+		if((unsigned long)esp_dev->cd_BoardAddr < 0x1000000)
+			return 0;
+
+		esp = esp_allocate(tpnt, (void *) esp_dev);
+
+		/* 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 = 0;
+		esp->dma_invalidate = 0;
+		esp->dma_irq_entry = 0;
+		esp->dma_irq_exit = 0;
+		esp->dma_led_on = &dma_led_on;
+		esp->dma_led_off = &dma_led_off;
+		esp->dma_poll = 0;
+		esp->dma_reset = 0;
+
+		/* Initialize the portBits (enable IRQs) */
+		ctrl_data = (FASTLANE_DMA_FCODE |
+#ifndef NODMAIRQ
+			     FASTLANE_DMA_EDI |
+#endif
+			     FASTLANE_DMA_ESI);
+			
+
+		/* SCSI chip clock */
+		esp->cfreq = 40000000;
+
+
+		/* Map the physical address space into virtual kernel space */
+		address = (unsigned long)
+			kernel_map((unsigned long)esp_dev->cd_BoardAddr,
+				   esp_dev->cd_BoardSize,
+				   KERNELMAP_NOCACHE_SER,
+				   NULL);
+
+		if(!address){
+			printk("Could not remap Fastlane controller memory!");
+			scsi_unregister (esp->ehost);
+			return 0;
+		}
+
+
+		/* The DMA registers on the Fastlane are mapped
+		 * relative to the device (i.e. in the same Zorro
+		 * I/O block).
+		 */
+		esp->dregs = (void *)(address + FASTLANE_DMA_ADDR);
+
+		/* ESP register base */
+		esp->eregs = (struct ESP_regs *)(address + FASTLANE_ESP_ADDR);
+
+		/* Board base */
+		esp->edev = (void *) address;
+		
+		/* Set the command buffer */
+		esp->esp_command_dvma = VTOP((unsigned long) cmd_buffer);
+
+		esp->irq = IRQ_AMIGA_PORTS;
+		request_irq(IRQ_AMIGA_PORTS, esp_intr, 0, 
+			    "Fastlane SCSI", esp_intr);
+
+		/* Controller ID */
+		esp->scsi_id = 7;
+		
+		/* Check for differential SCSI-bus */
+		/* What is this stuff? */
+		esp->diff = 0;
+
+		dma_clear(esp);
+		esp_initialize(esp);
+
+		zorro_config_board(key, 0);
+
+		printk("\nESP: 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 int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
+{
+	/* Since the Fastlane DMA is fully dedicated to the ESP chip,
+	 * the number of bytes sent (to the ESP chip) equals the number
+	 * of bytes in the FIFO - there is no buffering in the DMA controller.
+	 * XXXX Do I read this right? It is from host to ESP, right?
+	 */
+	return fifo_count;
+}
+
+static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp)
+{
+	unsigned long sz = sp->SCp.this_residual;
+	if(sz > 0xfffc)
+		sz = 0xfffc;
+	return sz;
+}
+
+static void dma_dump_state(struct NCR_ESP *esp)
+{
+	ESPLOG(("esp%d: dma -- cond_reg<%02x>\n",
+		esp->esp_id, ((struct fastlane_dma_registers *)
+			      (esp->dregs))->cond_reg));
+	ESPLOG(("intreq:<%04x>, intena:<%04x>\n",
+		custom.intreqr, custom.intenar));
+}
+
+static void dma_init_read(struct NCR_ESP *esp, __u32 addr, int length)
+{
+	struct fastlane_dma_registers *dregs = 
+		(struct fastlane_dma_registers *) (esp->dregs);
+	unsigned long *t;
+	
+	cache_clear(addr, length);
+
+	dma_clear(esp);
+
+	t = (unsigned long *)((addr & 0x00ffffff) + esp->edev);
+
+	dregs->clear_strobe = 0;
+	*t = addr;
+
+	ctrl_data = (ctrl_data & FASTLANE_DMA_MASK) | FASTLANE_DMA_ENABLE;
+	dregs->ctrl_reg = ctrl_data;
+}
+
+static void dma_init_write(struct NCR_ESP *esp, __u32 addr, int length)
+{
+	struct fastlane_dma_registers *dregs = 
+		(struct fastlane_dma_registers *) (esp->dregs);
+	unsigned long *t;
+
+	cache_push(addr, length);
+
+	dma_clear(esp);
+
+	t = (unsigned long *)((addr & 0x00ffffff) + (esp->edev));
+
+	dregs->clear_strobe = 0;
+	*t = addr;
+
+	ctrl_data = ((ctrl_data & FASTLANE_DMA_MASK) | 
+		     FASTLANE_DMA_ENABLE |
+		     FASTLANE_DMA_WRITE);
+	dregs->ctrl_reg = ctrl_data;
+}
+
+static inline void dma_clear(struct NCR_ESP *esp)
+{
+	struct fastlane_dma_registers *dregs = 
+		(struct fastlane_dma_registers *) (esp->dregs);
+	unsigned long *t;
+
+	ctrl_data = (ctrl_data & FASTLANE_DMA_MASK);
+	dregs->ctrl_reg = ctrl_data;
+
+	t = (unsigned long *)(esp->edev);
+
+	dregs->clear_strobe = 0;
+	*t = 0 ;
+}
+
+
+static void dma_ints_off(struct NCR_ESP *esp)
+{
+	disable_irq(esp->irq);
+}
+
+static void dma_ints_on(struct NCR_ESP *esp)
+{
+	enable_irq(esp->irq);
+}
+
+static int dma_irq_p(struct NCR_ESP *esp)
+{
+	struct fastlane_dma_registers *dregs = 
+		(struct fastlane_dma_registers *) (esp->dregs);
+#if 0
+	unsigned char dma_status;
+	int r = 0;
+
+	dma_status = dregs->cond_reg;
+
+	if(dma_status & FASTLANE_DMA_IACT)
+		return 0;	/* not our IRQ */
+
+	/* Return 1 if ESP requested IRQ */
+	if(
+#ifndef NODMAIRQ
+	   (dma_status & FASTLANE_DMA_CREQ) &&
+#endif
+	   (!(dma_status & FASTLANE_DMA_MINT)) &&
+	   ((((struct ESP_regs *) (esp->eregs))->esp_status) & ESP_STAT_INTR))
+		r = 1;
+
+	dregs->ctrl_reg = (ctrl_data & ~(FASTLANE_DMA_EDI|FASTLANE_DMA_ESI) );
+	dregs->ctrl_reg = ctrl_data;
+
+	return r;
+#else
+	int r;
+	r = (((struct ESP_regs *) (esp->eregs))->esp_status) & ESP_STAT_INTR;
+	dregs->ctrl_reg = ctrl_data & ~(FASTLANE_DMA_EDI|FASTLANE_DMA_ESI);
+	dregs->ctrl_reg = ctrl_data;
+	return r;
+#endif
+}
+
+static void dma_led_off(struct NCR_ESP *esp)
+{
+	ctrl_data &= ~FASTLANE_DMA_LED;
+	((struct fastlane_dma_registers *)(esp->dregs))->ctrl_reg = ctrl_data;
+}
+
+static void dma_led_on(struct NCR_ESP *esp)
+{
+	ctrl_data |= FASTLANE_DMA_LED;
+	((struct fastlane_dma_registers *)(esp->dregs))->ctrl_reg = ctrl_data;
+}
+
+static int dma_ports_p(struct NCR_ESP *esp)
+{
+	return ((custom.intenar) & IF_PORTS);
+}
+
+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);
+	}
+}