pata_hpt3x2n: Add HPT371N support and other bits

Yes its no longer 3x2n but 3xxn, I can rename it if you want Jeff

- Don't reset both ports each time (Sergei)
- If we can't get a DPLL then abort entirely
- Use ioport access for clock (from drivers/ide)
- Add HPT371N support (from drivers/ide)
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/ata/pata_hpt3x2n.c

@@ -8,10 +8,10 @@
  * Copyright (C) 1999-2003		Andre Hedrick <andre@linux-ide.org>
  * Portions Copyright (C) 2001	        Sun Microsystems, Inc.
  * Portions Copyright (C) 2003		Red Hat Inc
+ * Portions Copyright (C) 2005-2006	MontaVista Software, Inc.
  *
  *
  * TODO
- *	371N
  *	Work out best PLL policy
  */
 
@@ -142,6 +142,7 @@ static int hpt3x2n_cable_detect(struct ata_port *ap)
 /**
  *	hpt3x2n_pre_reset	-	reset the hpt3x2n bus
  *	@ap: ATA port to reset
+ *	@deadline: deadline jiffies for the operation
  *
  *	Perform the initial reset handling for the 3x2n series controllers.
  *	Reset the hardware and state machine,
@@ -151,8 +152,7 @@ static int hpt3xn_pre_reset(struct ata_port *ap)
 {
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	/* Reset the state machine */
-	pci_write_config_byte(pdev, 0x50, 0x37);
-	pci_write_config_byte(pdev, 0x54, 0x37);
+	pci_write_config_byte(pdev, 0x50 + 4 * ap->port_no, 0x37);
 	udelay(100);
 	return ata_std_prereset(ap);
 }
@@ -433,8 +433,9 @@ static int hpt3x2n_pci_clock(struct pci_dev *pdev)
 {
 	unsigned long freq;
 	u32 fcnt;
+	unsigned long iobase = pci_resource_start(pdev, 4);
 
-	pci_read_config_dword(pdev, 0x70/*CHECKME*/, &fcnt);
+	fcnt = inl(iobase + 0x90);	/* Not PCI readable for some chips */
 	if ((fcnt >> 12) != 0xABCDE) {
 		printk(KERN_WARNING "hpt3xn: BIOS clock data not set.\n");
 		return 33;	/* Not BIOS set */
@@ -503,6 +504,7 @@ static int hpt3x2n_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 	unsigned int pci_mhz;
 	unsigned int f_low, f_high;
 	int adjust;
+	unsigned long iobase = pci_resource_start(dev, 4);
 
 	pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
 	class_rev &= 0xFF;
@@ -512,6 +514,11 @@ static int hpt3x2n_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 			if (class_rev < 6)
 				return -ENODEV;
 			break;
+		case PCI_DEVICE_ID_TTI_HPT371:
+			if (class_rev < 2)
+				return -ENODEV;
+			/* 371N if rev > 1 */
+			break;
 		case PCI_DEVICE_ID_TTI_HPT372:
 			/* 372N if rev >= 1*/
 			if (class_rev == 0)
@@ -539,6 +546,19 @@ static int hpt3x2n_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 	irqmask &= ~0x10;
 	pci_write_config_byte(dev, 0x5a, irqmask);
 
+	/*
+	 * HPT371 chips physically have only one channel, the secondary one,
+	 * but the primary channel registers do exist!  Go figure...
+	 * So,  we manually disable the non-existing channel here
+	 * (if the BIOS hasn't done this already).
+	 */
+	if (dev->device == PCI_DEVICE_ID_TTI_HPT371) {
+		u8 mcr1;
+		pci_read_config_byte(dev, 0x50, &mcr1);
+		mcr1 &= ~0x04;
+		pci_write_config_byte(dev, 0x50, mcr1);
+	}
+
 	/* Tune the PLL. HPT recommend using 75 for SATA, 66 for UDMA133 or
 	   50 for UDMA100. Right now we always use 66 */
 
@@ -557,14 +577,24 @@ static int hpt3x2n_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 			break;
 		pci_write_config_dword(dev, 0x5C, (f_high << 16) | f_low);
 	}
-	if (adjust == 8)
-		printk(KERN_WARNING "hpt3xn: DPLL did not stabilize.\n");
+	if (adjust == 8) {
+		printk(KERN_WARNING "hpt3x2n: DPLL did not stabilize.\n");
+		return -ENODEV;
+	}
 
 	/* Set our private data up. We only need a few flags so we use
 	   it directly */
 	port->private_data = NULL;
-	if (pci_mhz > 60)
+	if (pci_mhz > 60) {
 		port->private_data = (void *)PCI66;
+		/*
+		 * On  HPT371N, if ATA clock is 66 MHz we must set bit 2 in
+		 * the MISC. register to stretch the UltraDMA Tss timing.
+		 * NOTE: This register is only writeable via I/O space.
+		 */
+		if (dev->device == PCI_DEVICE_ID_TTI_HPT371)
+			outb(inb(iobase + 0x9c) | 0x04, iobase + 0x9c);
+	}
 
 	/* Now kick off ATA set up */
 	port_info[0] = port_info[1] = port;
@@ -573,6 +603,7 @@ static int hpt3x2n_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 
 static const struct pci_device_id hpt3x2n[] = {
 	{ PCI_VDEVICE(TTI, PCI_DEVICE_ID_TTI_HPT366), },
+	{ PCI_VDEVICE(TTI, PCI_DEVICE_ID_TTI_HPT371), },
 	{ PCI_VDEVICE(TTI, PCI_DEVICE_ID_TTI_HPT372), },
 	{ PCI_VDEVICE(TTI, PCI_DEVICE_ID_TTI_HPT302), },
 	{ PCI_VDEVICE(TTI, PCI_DEVICE_ID_TTI_HPT372N), },