sata_promise: SATAII-150/300 TX4 port numbering fix

There is a known problem with sata_promise on SATAII-150/300 TX4
controller cards: it enumerates drives in an order that differs
from the port numbers printed on the controller cards. However,
Promise's BIOS and Linux driver both get the order right.

I investigated Promise's Linux driver (v1.01.0.23), and found
that it explicitly changes the mapping from logical port number
to ATA engine MMIO address on the SATAII TX4 cards. It does this
on all SATAII TX4 cards, without inspecting revision etc. The
SATAII TX2plus cards continue to use the same mapping that was
used for the first-generation chips.

This patch updates sata_promise to use the new port number to
ATA engine mapping on SATAII TX4 cards, which fixes the drive
enumeration order problem on those cards. Tested on several
1st and 2nd generation TX2plus and TX4 chips.

Signed-off-by: Mikael Pettersson <mikpe@it.uu.se>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/ata/sata_promise.c

@@ -45,7 +45,7 @@
 #include "sata_promise.h"
 
 #define DRV_NAME	"sata_promise"
-#define DRV_VERSION	"2.06"
+#define DRV_VERSION	"2.07"
 
 
 enum {
@@ -926,6 +926,7 @@ static int pdc_ata_init_one (struct pci_dev *pdev, const struct pci_device_id *e
 	struct ata_host *host;
 	void __iomem *base;
 	int n_ports, i, rc;
+	int is_sataii_tx4;
 
 	if (!printed_version++)
 		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
@@ -964,10 +965,23 @@ static int pdc_ata_init_one (struct pci_dev *pdev, const struct pci_device_id *e
 	}
 	host->iomap = pcim_iomap_table(pdev);
 
-	for (i = 0; i < host->n_ports; i++)
+	is_sataii_tx4 = 0;
+	if ((pi->flags & (PDC_FLAG_GEN_II|PDC_FLAG_4_PORTS)) == (PDC_FLAG_GEN_II|PDC_FLAG_4_PORTS)) {
+		is_sataii_tx4 = 1;
+		dev_printk(KERN_INFO, &pdev->dev, "applying SATAII TX4 port numbering workaround\n");
+	}
+	for (i = 0; i < host->n_ports; i++) {
+		static const unsigned char sataii_tx4_port_remap[4] = { 3, 1, 0, 2};
+		int ata_nr;
+
+		ata_nr = i;
+		if (is_sataii_tx4)
+			ata_nr = sataii_tx4_port_remap[i];
+
 		pdc_ata_setup_port(host->ports[i],
-				   base + 0x200 + i * 0x80,
-				   base + 0x400 + i * 0x100);
+				   base + 0x200 + ata_nr * 0x80,
+				   base + 0x400 + ata_nr * 0x100);
+	}
 
 	/* initialize adapter */
 	pdc_host_init(host);