patch-2.3.99-pre1 linux/drivers/ide/ns87415.c

• Lines: 186
• Date: Sat Feb 26 20:32:14 2000
• Orig file: v2.3.51/linux/drivers/ide/ns87415.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.51/linux/drivers/ide/ns87415.c linux/drivers/ide/ns87415.c
@@ -0,0 +1,185 @@
+/*
+ * linux/drivers/block/ns87415.c		Version 1.00  December 7, 1997
+ *
+ * Copyright (C) 1997-1998  Mark Lord
+ * Copyright (C) 1998       Eddie C. Dost  (ecd@skynet.be)
+ *
+ * Inspired by an earlier effort from David S. Miller (davem@caipfs.rutgers.edu)
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/blkdev.h>
+#include <linux/hdreg.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/ide.h>
+
+#include <asm/io.h>
+
+static unsigned int ns87415_count = 0, ns87415_control[MAX_HWIFS] = { 0 };
+
+/*
+ * This routine either enables/disables (according to drive->present)
+ * the IRQ associated with the port (HWIF(drive)),
+ * and selects either PIO or DMA handshaking for the next I/O operation.
+ */
+static void ns87415_prepare_drive (ide_drive_t *drive, unsigned int use_dma)
+{
+	ide_hwif_t *hwif = HWIF(drive);
+	unsigned int bit, other, new, *old = (unsigned int *) hwif->select_data;
+	struct pci_dev *dev = hwif->pci_dev;
+	unsigned long flags;
+
+	__save_flags(flags);	/* local CPU only */
+	__cli();		/* local CPU only */
+	new = *old;
+
+	/* Adjust IRQ enable bit */
+	bit = 1 << (8 + hwif->channel);
+	new = drive->present ? (new & ~bit) : (new | bit);
+
+	/* Select PIO or DMA, DMA may only be selected for one drive/channel. */
+	bit   = 1 << (20 + drive->select.b.unit       + (hwif->channel << 1));
+	other = 1 << (20 + (1 - drive->select.b.unit) + (hwif->channel << 1));
+	new = use_dma ? ((new & ~other) | bit) : (new & ~bit);
+
+	if (new != *old) {
+		unsigned char stat;
+
+		/*
+		 * Don't change DMA engine settings while Write Buffers
+		 * are busy.
+		 */
+		(void) pci_read_config_byte(dev, 0x43, &stat);
+		while (stat & 0x03) {
+			udelay(1);
+			(void) pci_read_config_byte(dev, 0x43, &stat);
+		}
+
+		*old = new;
+		(void) pci_write_config_dword(dev, 0x40, new);
+
+		/*
+		 * And let things settle...
+		 */
+		udelay(10);
+	}
+
+	__restore_flags(flags);	/* local CPU only */
+}
+
+static void ns87415_selectproc (ide_drive_t *drive)
+{
+	ns87415_prepare_drive (drive, drive->using_dma);
+}
+
+static int ns87415_dmaproc(ide_dma_action_t func, ide_drive_t *drive)
+{
+	ide_hwif_t	*hwif = HWIF(drive);
+	byte		dma_stat;
+
+	switch (func) {
+		case ide_dma_end: /* returns 1 on error, 0 otherwise */
+			drive->waiting_for_dma = 0;
+			dma_stat = inb(hwif->dma_base+2);
+			outb(inb(hwif->dma_base)&~1, hwif->dma_base);	/* stop DMA */
+			outb(inb(hwif->dma_base)|6, hwif->dma_base);	/* from ERRATA: clear the INTR & ERROR bits */
+			ide_destroy_dmatable(drive);			/* and free any DMA resources */
+			return (dma_stat & 7) != 4;		/* verify good DMA status */
+		case ide_dma_write:
+		case ide_dma_read:
+			ns87415_prepare_drive(drive, 1);	/* select DMA xfer */
+			if (!ide_dmaproc(func, drive))		/* use standard DMA stuff */
+				return 0;
+			ns87415_prepare_drive(drive, 0);	/* DMA failed: select PIO xfer */
+			return 1;
+		case ide_dma_check:
+			if (drive->media != ide_disk)
+				return ide_dmaproc(ide_dma_off_quietly, drive);
+			/* Fallthrough... */
+		default:
+			return ide_dmaproc(func, drive);	/* use standard DMA stuff */
+	}
+}
+
+void __init ide_init_ns87415 (ide_hwif_t *hwif)
+{
+	struct pci_dev *dev = hwif->pci_dev;
+	unsigned int ctrl, using_inta;
+	byte progif;
+#ifdef __sparc_v9__
+	int timeout;
+	byte stat;
+#endif
+
+	/* Set a good latency timer and cache line size value. */
+	(void) pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
+#ifdef __sparc_v9__
+	(void) pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 0x10);
+#endif
+
+	/*
+	 * We cannot probe for IRQ: both ports share common IRQ on INTA.
+	 * Also, leave IRQ masked during drive probing, to prevent infinite
+	 * interrupts from a potentially floating INTA..
+	 *
+	 * IRQs get unmasked in selectproc when drive is first used.
+	 */
+	(void) pci_read_config_dword(dev, 0x40, &ctrl);
+	(void) pci_read_config_byte(dev, 0x09, &progif);
+	/* is irq in "native" mode? */
+	using_inta = progif & (1 << (hwif->channel << 1));
+	if (!using_inta)
+		using_inta = ctrl & (1 << (4 + hwif->channel));
+	if (hwif->mate) {
+		hwif->select_data = hwif->mate->select_data;
+	} else {
+		hwif->select_data = (unsigned long)
+					&ns87415_control[ns87415_count++];
+		ctrl |= (1 << 8) | (1 << 9);	/* mask both IRQs */
+		if (using_inta)
+			ctrl &= ~(1 << 6);	/* unmask INTA */
+		*((unsigned int *)hwif->select_data) = ctrl;
+		(void) pci_write_config_dword(dev, 0x40, ctrl);
+
+		/*
+		 * Set prefetch size to 512 bytes for both ports,
+		 * but don't turn on/off prefetching here.
+		 */
+		pci_write_config_byte(dev, 0x55, 0xee);
+
+#ifdef __sparc_v9__
+		/*
+		 * XXX: Reset the device, if we don't it will not respond
+		 *      to SELECT_DRIVE() properly during first probe_hwif().
+		 */
+		timeout = 10000;
+		outb(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
+		udelay(10);
+		outb(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
+		do {
+			udelay(50);
+			stat = inb(hwif->io_ports[IDE_STATUS_OFFSET]);
+                	if (stat == 0xff)
+                        	break;
+        	} while ((stat & BUSY_STAT) && --timeout);
+#endif
+	}
+
+	if (hwif->dma_base)
+		outb(0x60, hwif->dma_base + 2);
+
+	if (!using_inta)
+		hwif->irq = hwif->channel ? 15 : 14;	/* legacy mode */
+	else if (!hwif->irq && hwif->mate && hwif->mate->irq)
+		hwif->irq = hwif->mate->irq;	/* share IRQ with mate */
+
+	if (hwif->dma_base)
+		hwif->dmaproc = &ns87415_dmaproc;
+	hwif->selectproc = &ns87415_selectproc;
+}