[PATCH] ahci: honor PORTS_IMPL on ICH8s

Some ICH8s use non-linear port mapping.  ahci driver didn't use to
honor PORTS_IMPL and this made ports after hole nonfunctional.  This
patch makes ahci mark those ports as dummy and properly initialize all
the implemented ports after the dummies.

As it's unknown whether other AHCIs implement PORTS_IMPL register
properly, new board id board_ahci_pi is added and selectively applied
to ICH8s.  All other AHCIs continue to use linear mapping regardless
of PORTS_IMPL value.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Robin H. Johnson <robbat2@gentoo.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/ata/ahci.c

@@ -53,6 +53,7 @@
 
 enum {
 	AHCI_PCI_BAR		= 5,
+	AHCI_MAX_PORTS		= 32,
 	AHCI_MAX_SG		= 168, /* hardware max is 64K */
 	AHCI_DMA_BOUNDARY	= 0xffffffff,
 	AHCI_USE_CLUSTERING	= 0,
@@ -77,8 +78,9 @@ enum {
 	RX_FIS_UNK		= 0x60, /* offset of Unknown FIS data */
 
 	board_ahci		= 0,
-	board_ahci_vt8251	= 1,
-	board_ahci_ign_iferr	= 2,
+	board_ahci_pi		= 1,
+	board_ahci_vt8251	= 2,
+	board_ahci_ign_iferr	= 3,
 
 	/* global controller registers */
 	HOST_CAP		= 0x00, /* host capabilities */
@@ -169,6 +171,7 @@ enum {
 	/* ap->flags bits */
 	AHCI_FLAG_NO_NCQ		= (1 << 24),
 	AHCI_FLAG_IGN_IRQ_IF_ERR	= (1 << 25), /* ignore IRQ_IF_ERR */
+	AHCI_FLAG_HONOR_PI		= (1 << 26), /* honor PORTS_IMPL */
 };
 
 struct ahci_cmd_hdr {
@@ -317,6 +320,16 @@ static const struct ata_port_info ahci_port_info[] = {
 		.udma_mask	= 0x7f, /* udma0-6 ; FIXME */
 		.port_ops	= &ahci_ops,
 	},
+	/* board_ahci_pi */
+	{
+		.sht		= &ahci_sht,
+		.flags		= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+				  ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
+				  ATA_FLAG_SKIP_D2H_BSY | AHCI_FLAG_HONOR_PI,
+		.pio_mask	= 0x1f, /* pio0-4 */
+		.udma_mask	= 0x7f, /* udma0-6 ; FIXME */
+		.port_ops	= &ahci_ops,
+	},
 	/* board_ahci_vt8251 */
 	{
 		.sht		= &ahci_sht,
@@ -353,22 +366,22 @@ static const struct pci_device_id ahci_pci_tbl[] = {
 	{ PCI_VDEVICE(INTEL, 0x2682), board_ahci }, /* ESB2 */
 	{ PCI_VDEVICE(INTEL, 0x2683), board_ahci }, /* ESB2 */
 	{ PCI_VDEVICE(INTEL, 0x27c6), board_ahci }, /* ICH7-M DH */
-	{ PCI_VDEVICE(INTEL, 0x2821), board_ahci }, /* ICH8 */
-	{ PCI_VDEVICE(INTEL, 0x2822), board_ahci }, /* ICH8 */
-	{ PCI_VDEVICE(INTEL, 0x2824), board_ahci }, /* ICH8 */
-	{ PCI_VDEVICE(INTEL, 0x2829), board_ahci }, /* ICH8M */
-	{ PCI_VDEVICE(INTEL, 0x282a), board_ahci }, /* ICH8M */
-	{ PCI_VDEVICE(INTEL, 0x2922), board_ahci }, /* ICH9 */
-	{ PCI_VDEVICE(INTEL, 0x2923), board_ahci }, /* ICH9 */
-	{ PCI_VDEVICE(INTEL, 0x2924), board_ahci }, /* ICH9 */
-	{ PCI_VDEVICE(INTEL, 0x2925), board_ahci }, /* ICH9 */
-	{ PCI_VDEVICE(INTEL, 0x2927), board_ahci }, /* ICH9 */
-	{ PCI_VDEVICE(INTEL, 0x2929), board_ahci }, /* ICH9M */
-	{ PCI_VDEVICE(INTEL, 0x292a), board_ahci }, /* ICH9M */
-	{ PCI_VDEVICE(INTEL, 0x292b), board_ahci }, /* ICH9M */
-	{ PCI_VDEVICE(INTEL, 0x292f), board_ahci }, /* ICH9M */
-	{ PCI_VDEVICE(INTEL, 0x294d), board_ahci }, /* ICH9 */
-	{ PCI_VDEVICE(INTEL, 0x294e), board_ahci }, /* ICH9M */
+	{ PCI_VDEVICE(INTEL, 0x2821), board_ahci_pi }, /* ICH8 */
+	{ PCI_VDEVICE(INTEL, 0x2822), board_ahci_pi }, /* ICH8 */
+	{ PCI_VDEVICE(INTEL, 0x2824), board_ahci_pi }, /* ICH8 */
+	{ PCI_VDEVICE(INTEL, 0x2829), board_ahci_pi }, /* ICH8M */
+	{ PCI_VDEVICE(INTEL, 0x282a), board_ahci_pi }, /* ICH8M */
+	{ PCI_VDEVICE(INTEL, 0x2922), board_ahci_pi }, /* ICH9 */
+	{ PCI_VDEVICE(INTEL, 0x2923), board_ahci_pi }, /* ICH9 */
+	{ PCI_VDEVICE(INTEL, 0x2924), board_ahci_pi }, /* ICH9 */
+	{ PCI_VDEVICE(INTEL, 0x2925), board_ahci_pi }, /* ICH9 */
+	{ PCI_VDEVICE(INTEL, 0x2927), board_ahci_pi }, /* ICH9 */
+	{ PCI_VDEVICE(INTEL, 0x2929), board_ahci_pi }, /* ICH9M */
+	{ PCI_VDEVICE(INTEL, 0x292a), board_ahci_pi }, /* ICH9M */
+	{ PCI_VDEVICE(INTEL, 0x292b), board_ahci_pi }, /* ICH9M */
+	{ PCI_VDEVICE(INTEL, 0x292f), board_ahci_pi }, /* ICH9M */
+	{ PCI_VDEVICE(INTEL, 0x294d), board_ahci_pi }, /* ICH9 */
+	{ PCI_VDEVICE(INTEL, 0x294e), board_ahci_pi }, /* ICH9M */
 
 	/* JMicron */
 	{ PCI_VDEVICE(JMICRON, 0x2360), board_ahci_ign_iferr }, /* JMB360 */
@@ -691,7 +704,8 @@ static int ahci_reset_controller(void __iomem *mmio, struct pci_dev *pdev)
 }
 
 static void ahci_init_controller(void __iomem *mmio, struct pci_dev *pdev,
-				 int n_ports, u32 cap)
+				 int n_ports, unsigned int port_flags,
+				 struct ahci_host_priv *hpriv)
 {
 	int i, rc;
 	u32 tmp;
@@ -700,13 +714,12 @@ static void ahci_init_controller(void __iomem *mmio, struct pci_dev *pdev,
 		void __iomem *port_mmio = ahci_port_base(mmio, i);
 		const char *emsg = NULL;
 
-#if 0 /* BIOSen initialize this incorrectly */
-		if (!(hpriv->port_map & (1 << i)))
+		if ((port_flags & AHCI_FLAG_HONOR_PI) &&
+		    !(hpriv->port_map & (1 << i)))
 			continue;
-#endif
 
 		/* make sure port is not active */
-		rc = ahci_deinit_port(port_mmio, cap, &emsg);
+		rc = ahci_deinit_port(port_mmio, hpriv->cap, &emsg);
 		if (rc)
 			dev_printk(KERN_WARNING, &pdev->dev,
 				   "%s (%d)\n", emsg, rc);
@@ -1363,7 +1376,8 @@ static int ahci_pci_device_resume(struct pci_dev *pdev)
 		if (rc)
 			return rc;
 
-		ahci_init_controller(mmio, pdev, host->n_ports, hpriv->cap);
+		ahci_init_controller(mmio, pdev, host->n_ports,
+				     host->ports[0]->flags, hpriv);
 	}
 
 	ata_host_resume(host);
@@ -1475,7 +1489,7 @@ static int ahci_host_init(struct ata_probe_ent *probe_ent)
 	struct ahci_host_priv *hpriv = probe_ent->private_data;
 	struct pci_dev *pdev = to_pci_dev(probe_ent->dev);
 	void __iomem *mmio = probe_ent->mmio_base;
-	unsigned int i, using_dac;
+	unsigned int i, cap_n_ports, using_dac;
 	int rc;
 
 	rc = ahci_reset_controller(mmio, pdev);
@@ -1484,10 +1498,34 @@ static int ahci_host_init(struct ata_probe_ent *probe_ent)
 
 	hpriv->cap = readl(mmio + HOST_CAP);
 	hpriv->port_map = readl(mmio + HOST_PORTS_IMPL);
-	probe_ent->n_ports = ahci_nr_ports(hpriv->cap);
+	cap_n_ports = ahci_nr_ports(hpriv->cap);
 
 	VPRINTK("cap 0x%x  port_map 0x%x  n_ports %d\n",
-		hpriv->cap, hpriv->port_map, probe_ent->n_ports);
+		hpriv->cap, hpriv->port_map, cap_n_ports);
+
+	if (probe_ent->port_flags & AHCI_FLAG_HONOR_PI) {
+		unsigned int n_ports = cap_n_ports;
+		u32 port_map = hpriv->port_map;
+		int max_port = 0;
+
+		for (i = 0; i < AHCI_MAX_PORTS && n_ports; i++) {
+			if (port_map & (1 << i)) {
+				n_ports--;
+				port_map &= ~(1 << i);
+				max_port = i;
+			} else
+				probe_ent->dummy_port_mask |= 1 << i;
+		}
+
+		if (n_ports || port_map)
+			dev_printk(KERN_WARNING, &pdev->dev,
+				   "nr_ports (%u) and implemented port map "
+				   "(0x%x) don't match\n",
+				   cap_n_ports, hpriv->port_map);
+
+		probe_ent->n_ports = max_port + 1;
+	} else
+		probe_ent->n_ports = cap_n_ports;
 
 	using_dac = hpriv->cap & HOST_CAP_64;
 	if (using_dac &&
@@ -1519,7 +1557,8 @@ static int ahci_host_init(struct ata_probe_ent *probe_ent)
 	for (i = 0; i < probe_ent->n_ports; i++)
 		ahci_setup_port(&probe_ent->port[i], (unsigned long) mmio, i);
 
-	ahci_init_controller(mmio, pdev, probe_ent->n_ports, hpriv->cap);
+	ahci_init_controller(mmio, pdev, probe_ent->n_ports,
+			     probe_ent->port_flags, hpriv);
 
 	pci_set_master(pdev);