Initial import

1 files changed, 492 insertions, 0 deletions

diff --git a/drivers/ata/pata_serverworks.c b/drivers/ata/pata_serverworks.c
new file mode 100644
index 000000000..57de02123
--- /dev/null
+++ b/drivers/ata/pata_serverworks.c
@@ -0,0 +1,492 @@
+/*
+ * pata_serverworks.c 	- Serverworks PATA for new ATA layer
+ *			  (C) 2005 Red Hat Inc
+ *			  (C) 2010 Bartlomiej Zolnierkiewicz
+ *
+ * based upon
+ *
+ * serverworks.c
+ *
+ * Copyright (C) 1998-2000 Michel Aubry
+ * Copyright (C) 1998-2000 Andrzej Krzysztofowicz
+ * Copyright (C) 1998-2000 Andre Hedrick <andre@linux-ide.org>
+ * Portions copyright (c) 2001 Sun Microsystems
+ *
+ *
+ * RCC/ServerWorks IDE driver for Linux
+ *
+ *   OSB4: `Open South Bridge' IDE Interface (fn 1)
+ *         supports UDMA mode 2 (33 MB/s)
+ *
+ *   CSB5: `Champion South Bridge' IDE Interface (fn 1)
+ *         all revisions support UDMA mode 4 (66 MB/s)
+ *         revision A2.0 and up support UDMA mode 5 (100 MB/s)
+ *
+ *         *** The CSB5 does not provide ANY register ***
+ *         *** to detect 80-conductor cable presence. ***
+ *
+ *   CSB6: `Champion South Bridge' IDE Interface (optional: third channel)
+ *
+ * Documentation:
+ *	Available under NDA only. Errata info very hard to get.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+
+#define DRV_NAME "pata_serverworks"
+#define DRV_VERSION "0.4.3"
+
+#define SVWKS_CSB5_REVISION_NEW	0x92 /* min PCI_REVISION_ID for UDMA5 (A2.0) */
+#define SVWKS_CSB6_REVISION	0xa0 /* min PCI_REVISION_ID for UDMA4 (A1.0) */
+
+/* Seagate Barracuda ATA IV Family drives in UDMA mode 5
+ * can overrun their FIFOs when used with the CSB5 */
+
+static const char *csb_bad_ata100[] = {
+	"ST320011A",
+	"ST340016A",
+	"ST360021A",
+	"ST380021A",
+	NULL
+};
+
+/**
+ *	oem_cable	-	Dell/Sun serverworks cable detection
+ *	@ap: ATA port to do cable detect
+ *
+ *	Dell PowerEdge and Sun Cobalt 'Alpine' hide the 40/80 pin select
+ *	for their interfaces in the top two bits of the subsystem ID.
+ */
+
+static int oem_cable(struct ata_port *ap)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+
+	if (pdev->subsystem_device & (1 << (ap->port_no + 14)))
+		return ATA_CBL_PATA80;
+	return ATA_CBL_PATA40;
+}
+
+struct sv_cable_table {
+	int device;
+	int subvendor;
+	int (*cable_detect)(struct ata_port *ap);
+};
+
+static struct sv_cable_table cable_detect[] = {
+	{ PCI_DEVICE_ID_SERVERWORKS_CSB5IDE,   PCI_VENDOR_ID_DELL, oem_cable },
+	{ PCI_DEVICE_ID_SERVERWORKS_CSB6IDE,   PCI_VENDOR_ID_DELL, oem_cable },
+	{ PCI_DEVICE_ID_SERVERWORKS_CSB5IDE,   PCI_VENDOR_ID_SUN,  oem_cable },
+	{ PCI_DEVICE_ID_SERVERWORKS_OSB4IDE,   PCI_ANY_ID, ata_cable_40wire  },
+	{ PCI_DEVICE_ID_SERVERWORKS_CSB5IDE,   PCI_ANY_ID, ata_cable_unknown },
+	{ PCI_DEVICE_ID_SERVERWORKS_CSB6IDE,   PCI_ANY_ID, ata_cable_unknown },
+	{ PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2,  PCI_ANY_ID, ata_cable_unknown },
+	{ PCI_DEVICE_ID_SERVERWORKS_HT1000IDE, PCI_ANY_ID, ata_cable_unknown },
+	{ }
+};
+
+/**
+ *	serverworks_cable_detect	-	cable detection
+ *	@ap: ATA port
+ *
+ *	Perform cable detection according to the device and subvendor
+ *	identifications
+ */
+
+static int serverworks_cable_detect(struct ata_port *ap)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	struct sv_cable_table *cb = cable_detect;
+
+	while(cb->device) {
+		if (cb->device == pdev->device &&
+		    (cb->subvendor == pdev->subsystem_vendor ||
+		      cb->subvendor == PCI_ANY_ID)) {
+			return cb->cable_detect(ap);
+		}
+		cb++;
+	}
+
+	BUG();
+	return -1;	/* kill compiler warning */
+}
+
+/**
+ *	serverworks_is_csb	-	Check for CSB or OSB
+ *	@pdev: PCI device to check
+ *
+ *	Returns true if the device being checked is known to be a CSB
+ *	series device.
+ */
+
+static u8 serverworks_is_csb(struct pci_dev *pdev)
+{
+	switch (pdev->device) {
+		case PCI_DEVICE_ID_SERVERWORKS_CSB5IDE:
+		case PCI_DEVICE_ID_SERVERWORKS_CSB6IDE:
+		case PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2:
+		case PCI_DEVICE_ID_SERVERWORKS_HT1000IDE:
+			return 1;
+		default:
+			break;
+	}
+	return 0;
+}
+
+/**
+ *	serverworks_osb4_filter	-	mode selection filter
+ *	@adev: ATA device
+ *	@mask: Mask of proposed modes
+ *
+ *	Filter the offered modes for the device to apply controller
+ *	specific rules. OSB4 requires no UDMA for disks due to a FIFO
+ *	bug we hit.
+ */
+
+static unsigned long serverworks_osb4_filter(struct ata_device *adev, unsigned long mask)
+{
+	if (adev->class == ATA_DEV_ATA)
+		mask &= ~ATA_MASK_UDMA;
+	return mask;
+}
+
+
+/**
+ *	serverworks_csb_filter	-	mode selection filter
+ *	@adev: ATA device
+ *	@mask: Mask of proposed modes
+ *
+ *	Check the blacklist and disable UDMA5 if matched
+ */
+
+static unsigned long serverworks_csb_filter(struct ata_device *adev, unsigned long mask)
+{
+	const char *p;
+	char model_num[ATA_ID_PROD_LEN + 1];
+	int i;
+
+	/* Disk, UDMA */
+	if (adev->class != ATA_DEV_ATA)
+		return mask;
+
+	/* Actually do need to check */
+	ata_id_c_string(adev->id, model_num, ATA_ID_PROD, sizeof(model_num));
+
+	for (i = 0; (p = csb_bad_ata100[i]) != NULL; i++) {
+		if (!strcmp(p, model_num))
+			mask &= ~(0xE0 << ATA_SHIFT_UDMA);
+	}
+	return mask;
+}
+
+/**
+ *	serverworks_set_piomode	-	set initial PIO mode data
+ *	@ap: ATA interface
+ *	@adev: ATA device
+ *
+ *	Program the OSB4/CSB5 timing registers for PIO. The PIO register
+ *	load is done as a simple lookup.
+ */
+static void serverworks_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+	static const u8 pio_mode[] = { 0x5d, 0x47, 0x34, 0x22, 0x20 };
+	int offset = 1 + 2 * ap->port_no - adev->devno;
+	int devbits = (2 * ap->port_no + adev->devno) * 4;
+	u16 csb5_pio;
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	int pio = adev->pio_mode - XFER_PIO_0;
+
+	pci_write_config_byte(pdev, 0x40 + offset, pio_mode[pio]);
+
+	/* The OSB4 just requires the timing but the CSB series want the
+	   mode number as well */
+	if (serverworks_is_csb(pdev)) {
+		pci_read_config_word(pdev, 0x4A, &csb5_pio);
+		csb5_pio &= ~(0x0F << devbits);
+		pci_write_config_word(pdev, 0x4A, csb5_pio | (pio << devbits));
+	}
+}
+
+/**
+ *	serverworks_set_dmamode	-	set initial DMA mode data
+ *	@ap: ATA interface
+ *	@adev: ATA device
+ *
+ *	Program the MWDMA/UDMA modes for the serverworks OSB4/CSB5
+ *	chipset. The MWDMA mode values are pulled from a lookup table
+ *	while the chipset uses mode number for UDMA.
+ */
+
+static void serverworks_set_dmamode(struct ata_port *ap, struct ata_device *adev)
+{
+	static const u8 dma_mode[] = { 0x77, 0x21, 0x20 };
+	int offset = 1 + 2 * ap->port_no - adev->devno;
+	int devbits = 2 * ap->port_no + adev->devno;
+	u8 ultra;
+	u8 ultra_cfg;
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+
+	pci_read_config_byte(pdev, 0x54, &ultra_cfg);
+	pci_read_config_byte(pdev, 0x56 + ap->port_no, &ultra);
+	ultra &= ~(0x0F << (adev->devno * 4));
+
+	if (adev->dma_mode >= XFER_UDMA_0) {
+		pci_write_config_byte(pdev, 0x44 + offset,  0x20);
+
+		ultra |= (adev->dma_mode - XFER_UDMA_0)
+					<< (adev->devno * 4);
+		ultra_cfg |=  (1 << devbits);
+	} else {
+		pci_write_config_byte(pdev, 0x44 + offset,
+			dma_mode[adev->dma_mode - XFER_MW_DMA_0]);
+		ultra_cfg &= ~(1 << devbits);
+	}
+	pci_write_config_byte(pdev, 0x56 + ap->port_no, ultra);
+	pci_write_config_byte(pdev, 0x54, ultra_cfg);
+}
+
+static struct scsi_host_template serverworks_osb4_sht = {
+	ATA_BMDMA_SHT(DRV_NAME),
+	.sg_tablesize	= LIBATA_DUMB_MAX_PRD,
+};
+
+static struct scsi_host_template serverworks_csb_sht = {
+	ATA_BMDMA_SHT(DRV_NAME),
+};
+
+static struct ata_port_operations serverworks_osb4_port_ops = {
+	.inherits	= &ata_bmdma_port_ops,
+	.qc_prep	= ata_bmdma_dumb_qc_prep,
+	.cable_detect	= serverworks_cable_detect,
+	.mode_filter	= serverworks_osb4_filter,
+	.set_piomode	= serverworks_set_piomode,
+	.set_dmamode	= serverworks_set_dmamode,
+};
+
+static struct ata_port_operations serverworks_csb_port_ops = {
+	.inherits	= &serverworks_osb4_port_ops,
+	.qc_prep	= ata_bmdma_qc_prep,
+	.mode_filter	= serverworks_csb_filter,
+};
+
+static int serverworks_fixup_osb4(struct pci_dev *pdev)
+{
+	u32 reg;
+	struct pci_dev *isa_dev = pci_get_device(PCI_VENDOR_ID_SERVERWORKS,
+		  PCI_DEVICE_ID_SERVERWORKS_OSB4, NULL);
+	if (isa_dev) {
+		pci_read_config_dword(isa_dev, 0x64, &reg);
+		reg &= ~0x00002000; /* disable 600ns interrupt mask */
+		if (!(reg & 0x00004000))
+			printk(KERN_DEBUG DRV_NAME ": UDMA not BIOS enabled.\n");
+		reg |=  0x00004000; /* enable UDMA/33 support */
+		pci_write_config_dword(isa_dev, 0x64, reg);
+		pci_dev_put(isa_dev);
+		return 0;
+	}
+	printk(KERN_WARNING DRV_NAME ": Unable to find bridge.\n");
+	return -ENODEV;
+}
+
+static int serverworks_fixup_csb(struct pci_dev *pdev)
+{
+	u8 btr;
+
+	/* Third Channel Test */
+	if (!(PCI_FUNC(pdev->devfn) & 1)) {
+		struct pci_dev * findev = NULL;
+		u32 reg4c = 0;
+		findev = pci_get_device(PCI_VENDOR_ID_SERVERWORKS,
+			PCI_DEVICE_ID_SERVERWORKS_CSB5, NULL);
+		if (findev) {
+			pci_read_config_dword(findev, 0x4C, &reg4c);
+			reg4c &= ~0x000007FF;
+			reg4c |=  0x00000040;
+			reg4c |=  0x00000020;
+			pci_write_config_dword(findev, 0x4C, reg4c);
+			pci_dev_put(findev);
+		}
+	} else {
+		struct pci_dev * findev = NULL;
+		u8 reg41 = 0;
+
+		findev = pci_get_device(PCI_VENDOR_ID_SERVERWORKS,
+				PCI_DEVICE_ID_SERVERWORKS_CSB6, NULL);
+		if (findev) {
+			pci_read_config_byte(findev, 0x41, &reg41);
+			reg41 &= ~0x40;
+			pci_write_config_byte(findev, 0x41, reg41);
+			pci_dev_put(findev);
+		}
+	}
+	/* setup the UDMA Control register
+	 *
+	 * 1. clear bit 6 to enable DMA
+	 * 2. enable DMA modes with bits 0-1
+	 * 	00 : legacy
+	 * 	01 : udma2
+	 * 	10 : udma2/udma4
+	 * 	11 : udma2/udma4/udma5
+	 */
+	pci_read_config_byte(pdev, 0x5A, &btr);
+	btr &= ~0x40;
+	if (!(PCI_FUNC(pdev->devfn) & 1))
+		btr |= 0x2;
+	else
+		btr |= (pdev->revision >= SVWKS_CSB5_REVISION_NEW) ? 0x3 : 0x2;
+	pci_write_config_byte(pdev, 0x5A, btr);
+
+	return btr;
+}
+
+static void serverworks_fixup_ht1000(struct pci_dev *pdev)
+{
+	u8 btr;
+	/* Setup HT1000 SouthBridge Controller - Single Channel Only */
+	pci_read_config_byte(pdev, 0x5A, &btr);
+	btr &= ~0x40;
+	btr |= 0x3;
+	pci_write_config_byte(pdev, 0x5A, btr);
+}
+
+static int serverworks_fixup(struct pci_dev *pdev)
+{
+	int rc = 0;
+
+	/* Force master latency timer to 64 PCI clocks */
+	pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0x40);
+
+	switch (pdev->device) {
+	case PCI_DEVICE_ID_SERVERWORKS_OSB4IDE:
+		rc = serverworks_fixup_osb4(pdev);
+		break;
+	case PCI_DEVICE_ID_SERVERWORKS_CSB5IDE:
+		ata_pci_bmdma_clear_simplex(pdev);
+		/* fall through */
+	case PCI_DEVICE_ID_SERVERWORKS_CSB6IDE:
+	case PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2:
+		rc = serverworks_fixup_csb(pdev);
+		break;
+	case PCI_DEVICE_ID_SERVERWORKS_HT1000IDE:
+		serverworks_fixup_ht1000(pdev);
+		break;
+	}
+
+	return rc;
+}
+
+static int serverworks_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	static const struct ata_port_info info[4] = {
+		{ /* OSB4 */
+			.flags = ATA_FLAG_SLAVE_POSS,
+			.pio_mask = ATA_PIO4,
+			.mwdma_mask = ATA_MWDMA2,
+			.udma_mask = ATA_UDMA2,
+			.port_ops = &serverworks_osb4_port_ops
+		}, { /* OSB4 no UDMA */
+			.flags = ATA_FLAG_SLAVE_POSS,
+			.pio_mask = ATA_PIO4,
+			.mwdma_mask = ATA_MWDMA2,
+			/* No UDMA */
+			.port_ops = &serverworks_osb4_port_ops
+		}, { /* CSB5 */
+			.flags = ATA_FLAG_SLAVE_POSS,
+			.pio_mask = ATA_PIO4,
+			.mwdma_mask = ATA_MWDMA2,
+			.udma_mask = ATA_UDMA4,
+			.port_ops = &serverworks_csb_port_ops
+		}, { /* CSB5 - later revisions*/
+			.flags = ATA_FLAG_SLAVE_POSS,
+			.pio_mask = ATA_PIO4,
+			.mwdma_mask = ATA_MWDMA2,
+			.udma_mask = ATA_UDMA5,
+			.port_ops = &serverworks_csb_port_ops
+		}
+	};
+	const struct ata_port_info *ppi[] = { &info[id->driver_data], NULL };
+	struct scsi_host_template *sht = &serverworks_csb_sht;
+	int rc;
+
+	rc = pcim_enable_device(pdev);
+	if (rc)
+		return rc;
+
+	rc = serverworks_fixup(pdev);
+
+	/* OSB4 : South Bridge and IDE */
+	if (pdev->device == PCI_DEVICE_ID_SERVERWORKS_OSB4IDE) {
+		/* Select non UDMA capable OSB4 if we can't do fixups */
+		if (rc < 0)
+			ppi[0] = &info[1];
+		sht = &serverworks_osb4_sht;
+	}
+	/* setup CSB5/CSB6 : South Bridge and IDE option RAID */
+	else if ((pdev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5IDE) ||
+		 (pdev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE) ||
+		 (pdev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2)) {
+
+		 /* If the returned btr is the newer revision then
+		    select the right info block */
+		 if (rc == 3)
+		 	ppi[0] = &info[3];
+
+		/* Is this the 3rd channel CSB6 IDE ? */
+		if (pdev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2)
+			ppi[1] = &ata_dummy_port_info;
+	}
+
+	return ata_pci_bmdma_init_one(pdev, ppi, sht, NULL, 0);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int serverworks_reinit_one(struct pci_dev *pdev)
+{
+	struct ata_host *host = pci_get_drvdata(pdev);
+	int rc;
+
+	rc = ata_pci_device_do_resume(pdev);
+	if (rc)
+		return rc;
+
+	(void)serverworks_fixup(pdev);
+
+	ata_host_resume(host);
+	return 0;
+}
+#endif
+
+static const struct pci_device_id serverworks[] = {
+	{ PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_OSB4IDE), 0},
+	{ PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB5IDE), 2},
+	{ PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB6IDE), 2},
+	{ PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2), 2},
+	{ PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_HT1000IDE), 2},
+
+	{ },
+};
+
+static struct pci_driver serverworks_pci_driver = {
+	.name 		= DRV_NAME,
+	.id_table	= serverworks,
+	.probe 		= serverworks_init_one,
+	.remove		= ata_pci_remove_one,
+#ifdef CONFIG_PM_SLEEP
+	.suspend	= ata_pci_device_suspend,
+	.resume		= serverworks_reinit_one,
+#endif
+};
+
+module_pci_driver(serverworks_pci_driver);
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("low-level driver for Serverworks OSB4/CSB5/CSB6");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, serverworks);
+MODULE_VERSION(DRV_VERSION);