[ide] ns87415: PA-RISC update

From: Grant Grundler <grundler@parisc-linux.org>
(minor changes by me - bart)

Move Superio (NatSem 87560) IDE hacks into the ns87415 driver
instead of exporting IDE data structures.

To date, only PA-RISC port is known to use the 87560 chip.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/pci/ns87415.c

@@ -4,6 +4,7 @@
  * Copyright (C) 1997-1998	Mark Lord <mlord@pobox.com>
  * Copyright (C) 1998		Eddie C. Dost <ecd@skynet.be>
  * Copyright (C) 1999-2000	Andre Hedrick <andre@linux-ide.org>
+ * Copyright (C) 2004		Grant Grundler <grundler at parisc-linux.org>
  *
  * Inspired by an earlier effort from David S. Miller <davem@redhat.com>
  */
@@ -25,6 +26,81 @@
 
 #include <asm/io.h>
 
+#ifdef CONFIG_SUPERIO
+/* SUPERIO 87560 is a PoS chip that NatSem denies exists.
+ * Unfortunately, it's built-in on all Astro-based PA-RISC workstations
+ * which use the integrated NS87514 cell for CD-ROM support.
+ * i.e we have to support for CD-ROM installs.
+ * See drivers/parisc/superio.c for more gory details.
+ */
+#include <asm/superio.h>
+
+static unsigned long superio_ide_status[2];
+static unsigned long superio_ide_select[2];
+static unsigned long superio_ide_dma_status[2];
+
+#define SUPERIO_IDE_MAX_RETRIES 25
+
+/* Because of a defect in Super I/O, all reads of the PCI DMA status 
+ * registers, IDE status register and the IDE select register need to be 
+ * retried
+ */
+static u8 superio_ide_inb (unsigned long port)
+{
+	if (port == superio_ide_status[0] ||
+	    port == superio_ide_status[1] ||
+	    port == superio_ide_select[0] ||
+	    port == superio_ide_select[1] ||
+	    port == superio_ide_dma_status[0] ||
+	    port == superio_ide_dma_status[1]) {
+		u8 tmp;
+		int retries = SUPERIO_IDE_MAX_RETRIES;
+
+		/* printk(" [ reading port 0x%x with retry ] ", port); */
+
+		do {
+			tmp = inb(port);
+			if (tmp == 0)
+				udelay(50);
+		} while (tmp == 0 && retries-- > 0);
+
+		return tmp;
+	}
+
+	return inb(port);
+}
+
+static void __devinit superio_ide_init_iops (struct hwif_s *hwif)
+{
+	u32 base, dmabase;
+	u8 tmp;
+	struct pci_dev *pdev = hwif->pci_dev;
+	u8 port = hwif->channel;
+
+	base = pci_resource_start(pdev, port * 2) & ~3;
+	dmabase = pci_resource_start(pdev, 4) & ~3;
+
+	superio_ide_status[port] = base + IDE_STATUS_OFFSET;
+	superio_ide_select[port] = base + IDE_SELECT_OFFSET;
+	superio_ide_dma_status[port] = dmabase + (!port ? 2 : 0xa);
+
+	/* Clear error/interrupt, enable dma */
+	tmp = superio_ide_inb(superio_ide_dma_status[port]);
+	outb(tmp | 0x66, superio_ide_dma_status[port]);
+
+	/* We need to override inb to workaround a SuperIO errata */
+	hwif->INB = superio_ide_inb;
+}
+
+static void __devinit init_iops_ns87415(ide_hwif_t *hwif)
+{
+	if (PCI_SLOT(hwif->pci_dev->devfn) == 0xE) {
+		/* Built-in - assume it's under superio. */
+		superio_ide_init_iops(hwif);
+	}
+}
+#endif
+
 static unsigned int ns87415_count = 0, ns87415_control[MAX_HWIFS] = { 0 };
 
 /*
@@ -205,6 +281,9 @@ static void __init init_hwif_ns87415 (ide_hwif_t *hwif)
 
 static ide_pci_device_t ns87415_chipset __devinitdata = {
 	.name		= "NS87415",
+#ifdef CONFIG_SUPERIO
+	.init_iops	= init_iops_ns87415,
+#endif
 	.init_hwif	= init_hwif_ns87415,
 	.channels	= 2,
 	.autodma	= AUTODMA,