[PATCH 2.6.14-rc1 1/3] Add disk hotswap support to libata RESEND #3

[Lukasz Kosewski <lkosewsk@gmail.com>]

Patch 1/3 for libata hotswapping.  Properly masks out interrupts for
Promise SATAII150 Tx2Plus/Tx4 controllers.  More comments in patch
header.

Luke Kosewski

15.09.05    Luke Kosewski   <lkosewsk@nit.ca>

	* A patch to the sata_promise driver in libata for it to correctly mask
	  out hotplug interrupts on SATAII150 Tx4/Tx2 Plus controllers.
	* This is resend #3.  It no longer applies to a -mm tree, but to
	  2.6.14-rc1.  Therefore, the entry for board_2057x no longer has
	  ATA_FLAG_SATA commented out.

diff -rpuN linux-2.6.14-rc1/drivers/scsi/sata_promise.c linux-2.6.14-rc1-new/drivers/scsi/sata_promise.c
--- linux-2.6.14-rc1/drivers/scsi/sata_promise.c	2005-09-12 23:12:09.000000000 -0400
+++ linux-2.6.14-rc1-new/drivers/scsi/sata_promise.c	2005-09-14 14:11:49.000000000 -0400
@@ -57,6 +57,7 @@ enum {
 	PDC_GLOBAL_CTL		= 0x48, /* Global control/status (per port) */
 	PDC_CTLSTAT		= 0x60,	/* IDE control and status (per port) */
 	PDC_SATA_PLUG_CSR	= 0x6C, /* SATA Plug control/status reg */
+	PDC2_SATA_PLUG_CSR	= 0X60, /* SATAII Plug control/status reg */
 	PDC_SLEW_CTL		= 0x470, /* slew rate control reg */
 
 	PDC_ERR_MASK		= (1<<19) | (1<<20) | (1<<21) | (1<<22) |
@@ -65,8 +66,10 @@ enum {
 	board_2037x		= 0,	/* FastTrak S150 TX2plus */
 	board_20319		= 1,	/* FastTrak S150 TX4 */
 	board_20619		= 2,	/* FastTrak TX4000 */
+	board_2057x		= 3,	/* SATAII150 Tx2plus */
+	board_40518		= 4,	/* SATAII150 Tx4 */
 
-	PDC_HAS_PATA		= (1 << 1), /* PDC20375 has PATA */
+	PDC_HAS_PATA		= (1 << 1), /* PDC20375/20575 has PATA */
 
 	PDC_RESET		= (1 << 11), /* HDMA reset */
 };
@@ -77,6 +80,10 @@ struct pdc_port_priv {
 	dma_addr_t		pkt_dma;
 };
 
+struct pdc_host_priv {
+	int			hotplug_offset;
+};
+
 static u32 pdc_sata_scr_read (struct ata_port *ap, unsigned int sc_reg);
 static void pdc_sata_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val);
 static int pdc_ata_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
@@ -190,6 +197,28 @@ static struct ata_port_info pdc_port_inf
 		.udma_mask	= 0x7f, /* udma0-6 ; FIXME */
 		.port_ops	= &pdc_pata_ops,
 	},
+
+	/* board_2057x */
+	{
+		.sht		= &pdc_ata_sht,
+		.host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+				  ATA_FLAG_SRST | ATA_FLAG_MMIO,
+		.pio_mask	= 0x1f, /* pio0-4 */
+		.mwdma_mask	= 0x07, /* mwdma0-2 */
+		.udma_mask	= 0x7f, /* udma0-6 ; FIXME */
+		.port_ops	= &pdc_sata_ops,
+	},
+
+	/* board_40518 */
+	{
+		.sht		= &pdc_ata_sht,
+		.host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+				  ATA_FLAG_SRST | ATA_FLAG_MMIO,
+		.pio_mask	= 0x1f, /* pio0-4 */
+		.mwdma_mask	= 0x07, /* mwdma0-2 */
+		.udma_mask	= 0x7f, /* udma0-6 ; FIXME */
+		.port_ops	= &pdc_sata_ops,
+	},
 };
 
 static struct pci_device_id pdc_ata_pci_tbl[] = {
@@ -204,9 +233,9 @@ static struct pci_device_id pdc_ata_pci_
 	{ PCI_VENDOR_ID_PROMISE, 0x3376, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 	  board_2037x },
 	{ PCI_VENDOR_ID_PROMISE, 0x3574, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
-	  board_2037x },
+	  board_2057x },
 	{ PCI_VENDOR_ID_PROMISE, 0x3d75, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
-	  board_2037x },
+	  board_2057x },
 
 	{ PCI_VENDOR_ID_PROMISE, 0x3318, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 	  board_20319 },
@@ -217,7 +246,7 @@ static struct pci_device_id pdc_ata_pci_
 	{ PCI_VENDOR_ID_PROMISE, 0x3d17, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 	  board_20319 },
 	{ PCI_VENDOR_ID_PROMISE, 0x3d18, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
-	  board_20319 },
+	  board_40518 },
 
 	{ PCI_VENDOR_ID_PROMISE, 0x6629, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 	  board_20619 },
@@ -478,14 +507,15 @@ static irqreturn_t pdc_interrupt (int ir
 		VPRINTK("QUICK EXIT 2\n");
 		return IRQ_NONE;
 	}
+
+	spin_lock(&host_set->lock);
+
 	mask &= 0xffff;		/* only 16 tags possible */
 	if (!mask) {
 		VPRINTK("QUICK EXIT 3\n");
-		return IRQ_NONE;
+		goto done_irq;
 	}
 
-	spin_lock(&host_set->lock);
-
 	writel(mask, mmio_base + PDC_INT_SEQMASK);
 
 	for (i = 0; i < host_set->n_ports; i++) {
@@ -502,10 +532,10 @@ static irqreturn_t pdc_interrupt (int ir
 		}
 	}
 
-        spin_unlock(&host_set->lock);
-
 	VPRINTK("EXIT\n");
 
+done_irq:
+	spin_unlock(&host_set->lock);
 	return IRQ_RETVAL(handled);
 }
 
@@ -583,6 +613,8 @@ static void pdc_ata_setup_port(struct at
 static void pdc_host_init(unsigned int chip_id, struct ata_probe_ent *pe)
 {
 	void __iomem *mmio = pe->mmio_base;
+	struct pdc_host_priv *hp = pe->private_data;
+	int hotplug_offset = hp->hotplug_offset;
 	u32 tmp;
 
 	/*
@@ -597,12 +629,12 @@ static void pdc_host_init(unsigned int c
 	writel(tmp, mmio + PDC_FLASH_CTL);
 
 	/* clear plug/unplug flags for all ports */
-	tmp = readl(mmio + PDC_SATA_PLUG_CSR);
-	writel(tmp | 0xff, mmio + PDC_SATA_PLUG_CSR);
+	tmp = readl(mmio + hotplug_offset);
+	writel(tmp | 0xff, mmio + hotplug_offset);
 
 	/* mask plug/unplug ints */
-	tmp = readl(mmio + PDC_SATA_PLUG_CSR);
-	writel(tmp | 0xff0000, mmio + PDC_SATA_PLUG_CSR);
+	tmp = readl(mmio + hotplug_offset);
+	writel(tmp | 0xff0000, mmio + hotplug_offset);
 
 	/* reduce TBG clock to 133 Mhz. */
 	tmp = readl(mmio + PDC_TBG_MODE);
@@ -624,6 +656,7 @@ static int pdc_ata_init_one (struct pci_
 {
 	static int printed_version;
 	struct ata_probe_ent *probe_ent = NULL;
+	struct pdc_host_priv *hp;
 	unsigned long base;
 	void __iomem *mmio_base;
 	unsigned int board_idx = (unsigned int) ent->driver_data;
@@ -671,6 +704,18 @@ static int pdc_ata_init_one (struct pci_
 	}
 	base = (unsigned long) mmio_base;
 
+	hp = kmalloc(sizeof(*hp), GFP_KERNEL);
+	if (hp == NULL)
+	{
+		rc = -ENOMEM;
+		goto err_out_free_ent;
+	}
+	memset(hp, 0, sizeof(*hp));
+
+	/* Set default hotplug offset */
+	hp->hotplug_offset = PDC_SATA_PLUG_CSR;
+	probe_ent->private_data = hp;
+
 	probe_ent->sht		= pdc_port_info[board_idx].sht;
 	probe_ent->host_flags	= pdc_port_info[board_idx].host_flags;
 	probe_ent->pio_mask	= pdc_port_info[board_idx].pio_mask;
@@ -690,6 +735,9 @@ static int pdc_ata_init_one (struct pci_
 
 	/* notice 4-port boards */
 	switch (board_idx) {
+	case board_40518:
+		/* Override hotplug offset for SATAII150 */
+		hp->hotplug_offset = PDC2_SATA_PLUG_CSR;
 	case board_20319:
        		probe_ent->n_ports = 4;
 
@@ -699,6 +747,9 @@ static int pdc_ata_init_one (struct pci_
 		probe_ent->port[2].scr_addr = base + 0x600;
 		probe_ent->port[3].scr_addr = base + 0x700;
 		break;
+	case board_2057x:
+		/* Override hotplug offset for SATAII150 */
+		hp->hotplug_offset = PDC2_SATA_PLUG_CSR;
 	case board_2037x:
        		probe_ent->n_ports = 2;
 		break;