Initial import

1 files changed, 533 insertions, 0 deletions

diff --git a/drivers/ata/pata_cmd64x.c b/drivers/ata/pata_cmd64x.c
new file mode 100644
index 000000000..13ca58832
--- /dev/null
+++ b/drivers/ata/pata_cmd64x.c
@@ -0,0 +1,533 @@
+/*
+ * pata_cmd64x.c 	- CMD64x PATA for new ATA layer
+ *			  (C) 2005 Red Hat Inc
+ *			  Alan Cox <alan@lxorguk.ukuu.org.uk>
+ *			  (C) 2009-2010 Bartlomiej Zolnierkiewicz
+ *			  (C) 2012 MontaVista Software, LLC <source@mvista.com>
+ *
+ * Based upon
+ * linux/drivers/ide/pci/cmd64x.c		Version 1.30	Sept 10, 2002
+ *
+ * cmd64x.c: Enable interrupts at initialization time on Ultra/PCI machines.
+ *           Note, this driver is not used at all on other systems because
+ *           there the "BIOS" has done all of the following already.
+ *           Due to massive hardware bugs, UltraDMA is only supported
+ *           on the 646U2 and not on the 646U.
+ *
+ * Copyright (C) 1998		Eddie C. Dost  (ecd@skynet.be)
+ * Copyright (C) 1998		David S. Miller (davem@redhat.com)
+ *
+ * Copyright (C) 1999-2002	Andre Hedrick <andre@linux-ide.org>
+ *
+ * TODO
+ *	Testing work
+ */
+
+#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_cmd64x"
+#define DRV_VERSION "0.2.18"
+
+/*
+ * CMD64x specific registers definition.
+ */
+
+enum {
+	CFR 		= 0x50,
+		CFR_INTR_CH0  = 0x04,
+	CNTRL		= 0x51,
+		CNTRL_CH0     = 0x04,
+		CNTRL_CH1     = 0x08,
+	CMDTIM 		= 0x52,
+	ARTTIM0 	= 0x53,
+	DRWTIM0 	= 0x54,
+	ARTTIM1 	= 0x55,
+	DRWTIM1 	= 0x56,
+	ARTTIM23 	= 0x57,
+		ARTTIM23_DIS_RA2  = 0x04,
+		ARTTIM23_DIS_RA3  = 0x08,
+		ARTTIM23_INTR_CH1 = 0x10,
+	DRWTIM2 	= 0x58,
+	BRST 		= 0x59,
+	DRWTIM3 	= 0x5b,
+	BMIDECR0	= 0x70,
+	MRDMODE		= 0x71,
+		MRDMODE_INTR_CH0 = 0x04,
+		MRDMODE_INTR_CH1 = 0x08,
+	BMIDESR0	= 0x72,
+	UDIDETCR0	= 0x73,
+	DTPR0		= 0x74,
+	BMIDECR1	= 0x78,
+	BMIDECSR	= 0x79,
+	UDIDETCR1	= 0x7B,
+	DTPR1		= 0x7C
+};
+
+static int cmd648_cable_detect(struct ata_port *ap)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	u8 r;
+
+	/* Check cable detect bits */
+	pci_read_config_byte(pdev, BMIDECSR, &r);
+	if (r & (1 << ap->port_no))
+		return ATA_CBL_PATA80;
+	return ATA_CBL_PATA40;
+}
+
+/**
+ *	cmd64x_set_timing	-	set PIO and MWDMA timing
+ *	@ap: ATA interface
+ *	@adev: ATA device
+ *	@mode: mode
+ *
+ *	Called to do the PIO and MWDMA mode setup.
+ */
+
+static void cmd64x_set_timing(struct ata_port *ap, struct ata_device *adev, u8 mode)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	struct ata_timing t;
+	const unsigned long T = 1000000 / 33;
+	const u8 setup_data[] = { 0x40, 0x40, 0x40, 0x80, 0x00 };
+
+	u8 reg;
+
+	/* Port layout is not logical so use a table */
+	const u8 arttim_port[2][2] = {
+		{ ARTTIM0, ARTTIM1 },
+		{ ARTTIM23, ARTTIM23 }
+	};
+	const u8 drwtim_port[2][2] = {
+		{ DRWTIM0, DRWTIM1 },
+		{ DRWTIM2, DRWTIM3 }
+	};
+
+	int arttim = arttim_port[ap->port_no][adev->devno];
+	int drwtim = drwtim_port[ap->port_no][adev->devno];
+
+	/* ata_timing_compute is smart and will produce timings for MWDMA
+	   that don't violate the drives PIO capabilities. */
+	if (ata_timing_compute(adev, mode, &t, T, 0) < 0) {
+		printk(KERN_ERR DRV_NAME ": mode computation failed.\n");
+		return;
+	}
+	if (ap->port_no) {
+		/* Slave has shared address setup */
+		struct ata_device *pair = ata_dev_pair(adev);
+
+		if (pair) {
+			struct ata_timing tp;
+			ata_timing_compute(pair, pair->pio_mode, &tp, T, 0);
+			ata_timing_merge(&t, &tp, &t, ATA_TIMING_SETUP);
+		}
+	}
+
+	printk(KERN_DEBUG DRV_NAME ": active %d recovery %d setup %d.\n",
+		t.active, t.recover, t.setup);
+	if (t.recover > 16) {
+		t.active += t.recover - 16;
+		t.recover = 16;
+	}
+	if (t.active > 16)
+		t.active = 16;
+
+	/* Now convert the clocks into values we can actually stuff into
+	   the chip */
+
+	if (t.recover == 16)
+		t.recover = 0;
+	else if (t.recover > 1)
+		t.recover--;
+	else
+		t.recover = 15;
+
+	if (t.setup > 4)
+		t.setup = 0xC0;
+	else
+		t.setup = setup_data[t.setup];
+
+	t.active &= 0x0F;	/* 0 = 16 */
+
+	/* Load setup timing */
+	pci_read_config_byte(pdev, arttim, &reg);
+	reg &= 0x3F;
+	reg |= t.setup;
+	pci_write_config_byte(pdev, arttim, reg);
+
+	/* Load active/recovery */
+	pci_write_config_byte(pdev, drwtim, (t.active << 4) | t.recover);
+}
+
+/**
+ *	cmd64x_set_piomode	-	set initial PIO mode data
+ *	@ap: ATA interface
+ *	@adev: ATA device
+ *
+ *	Used when configuring the devices ot set the PIO timings. All the
+ *	actual work is done by the PIO/MWDMA setting helper
+ */
+
+static void cmd64x_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+	cmd64x_set_timing(ap, adev, adev->pio_mode);
+}
+
+/**
+ *	cmd64x_set_dmamode	-	set initial DMA mode data
+ *	@ap: ATA interface
+ *	@adev: ATA device
+ *
+ *	Called to do the DMA mode setup.
+ */
+
+static void cmd64x_set_dmamode(struct ata_port *ap, struct ata_device *adev)
+{
+	static const u8 udma_data[] = {
+		0x30, 0x20, 0x10, 0x20, 0x10, 0x00
+	};
+
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	u8 regU, regD;
+
+	int pciU = UDIDETCR0 + 8 * ap->port_no;
+	int pciD = BMIDESR0 + 8 * ap->port_no;
+	int shift = 2 * adev->devno;
+
+	pci_read_config_byte(pdev, pciD, &regD);
+	pci_read_config_byte(pdev, pciU, &regU);
+
+	/* DMA bits off */
+	regD &= ~(0x20 << adev->devno);
+	/* DMA control bits */
+	regU &= ~(0x30 << shift);
+	/* DMA timing bits */
+	regU &= ~(0x05 << adev->devno);
+
+	if (adev->dma_mode >= XFER_UDMA_0) {
+		/* Merge the timing value */
+		regU |= udma_data[adev->dma_mode - XFER_UDMA_0] << shift;
+		/* Merge the control bits */
+		regU |= 1 << adev->devno; /* UDMA on */
+		if (adev->dma_mode > XFER_UDMA_2) /* 15nS timing */
+			regU |= 4 << adev->devno;
+	} else {
+		regU &= ~ (1 << adev->devno);	/* UDMA off */
+		cmd64x_set_timing(ap, adev, adev->dma_mode);
+	}
+
+	regD |= 0x20 << adev->devno;
+
+	pci_write_config_byte(pdev, pciU, regU);
+	pci_write_config_byte(pdev, pciD, regD);
+}
+
+/**
+ *	cmd64x_sff_irq_check	-	check IDE interrupt
+ *	@ap: ATA interface
+ *
+ *	Check IDE interrupt in CFR/ARTTIM23 registers.
+ */
+
+static bool cmd64x_sff_irq_check(struct ata_port *ap)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	int irq_mask = ap->port_no ? ARTTIM23_INTR_CH1 : CFR_INTR_CH0;
+	int irq_reg  = ap->port_no ? ARTTIM23 : CFR;
+	u8 irq_stat;
+
+	/* NOTE: reading the register should clear the interrupt */
+	pci_read_config_byte(pdev, irq_reg, &irq_stat);
+
+	return irq_stat & irq_mask;
+}
+
+/**
+ *	cmd64x_sff_irq_clear	-	clear IDE interrupt
+ *	@ap: ATA interface
+ *
+ *	Clear IDE interrupt in CFR/ARTTIM23 and DMA status registers.
+ */
+
+static void cmd64x_sff_irq_clear(struct ata_port *ap)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	int irq_reg = ap->port_no ? ARTTIM23 : CFR;
+	u8 irq_stat;
+
+	ata_bmdma_irq_clear(ap);
+
+	/* Reading the register should be enough to clear the interrupt */
+	pci_read_config_byte(pdev, irq_reg, &irq_stat);
+}
+
+/**
+ *	cmd648_sff_irq_check	-	check IDE interrupt
+ *	@ap: ATA interface
+ *
+ *	Check IDE interrupt in MRDMODE register.
+ */
+
+static bool cmd648_sff_irq_check(struct ata_port *ap)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	unsigned long base = pci_resource_start(pdev, 4);
+	int irq_mask = ap->port_no ? MRDMODE_INTR_CH1 : MRDMODE_INTR_CH0;
+	u8 mrdmode = inb(base + 1);
+
+	return mrdmode & irq_mask;
+}
+
+/**
+ *	cmd648_sff_irq_clear	-	clear IDE interrupt
+ *	@ap: ATA interface
+ *
+ *	Clear IDE interrupt in MRDMODE and DMA status registers.
+ */
+
+static void cmd648_sff_irq_clear(struct ata_port *ap)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	unsigned long base = pci_resource_start(pdev, 4);
+	int irq_mask = ap->port_no ? MRDMODE_INTR_CH1 : MRDMODE_INTR_CH0;
+	u8 mrdmode;
+
+	ata_bmdma_irq_clear(ap);
+
+	/* Clear this port's interrupt bit (leaving the other port alone) */
+	mrdmode  = inb(base + 1);
+	mrdmode &= ~(MRDMODE_INTR_CH0 | MRDMODE_INTR_CH1);
+	outb(mrdmode | irq_mask, base + 1);
+}
+
+/**
+ *	cmd646r1_bmdma_stop	-	DMA stop callback
+ *	@qc: Command in progress
+ *
+ *	Stub for now while investigating the r1 quirk in the old driver.
+ */
+
+static void cmd646r1_bmdma_stop(struct ata_queued_cmd *qc)
+{
+	ata_bmdma_stop(qc);
+}
+
+static struct scsi_host_template cmd64x_sht = {
+	ATA_BMDMA_SHT(DRV_NAME),
+};
+
+static const struct ata_port_operations cmd64x_base_ops = {
+	.inherits	= &ata_bmdma_port_ops,
+	.set_piomode	= cmd64x_set_piomode,
+	.set_dmamode	= cmd64x_set_dmamode,
+};
+
+static struct ata_port_operations cmd64x_port_ops = {
+	.inherits	= &cmd64x_base_ops,
+	.sff_irq_check	= cmd64x_sff_irq_check,
+	.sff_irq_clear	= cmd64x_sff_irq_clear,
+	.cable_detect	= ata_cable_40wire,
+};
+
+static struct ata_port_operations cmd646r1_port_ops = {
+	.inherits	= &cmd64x_base_ops,
+	.sff_irq_check	= cmd64x_sff_irq_check,
+	.sff_irq_clear	= cmd64x_sff_irq_clear,
+	.bmdma_stop	= cmd646r1_bmdma_stop,
+	.cable_detect	= ata_cable_40wire,
+};
+
+static struct ata_port_operations cmd646r3_port_ops = {
+	.inherits	= &cmd64x_base_ops,
+	.sff_irq_check	= cmd648_sff_irq_check,
+	.sff_irq_clear	= cmd648_sff_irq_clear,
+	.cable_detect	= ata_cable_40wire,
+};
+
+static struct ata_port_operations cmd648_port_ops = {
+	.inherits	= &cmd64x_base_ops,
+	.sff_irq_check	= cmd648_sff_irq_check,
+	.sff_irq_clear	= cmd648_sff_irq_clear,
+	.cable_detect	= cmd648_cable_detect,
+};
+
+static void cmd64x_fixup(struct pci_dev *pdev)
+{
+	u8 mrdmode;
+
+	pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 64);
+	pci_read_config_byte(pdev, MRDMODE, &mrdmode);
+	mrdmode &= ~0x30;	/* IRQ set up */
+	mrdmode |= 0x02;	/* Memory read line enable */
+	pci_write_config_byte(pdev, MRDMODE, mrdmode);
+
+	/* PPC specific fixup copied from old driver */
+#ifdef CONFIG_PPC
+	pci_write_config_byte(pdev, UDIDETCR0, 0xF0);
+#endif
+}
+
+static int cmd64x_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	static const struct ata_port_info cmd_info[7] = {
+		{	/* CMD 643 - no UDMA */
+			.flags = ATA_FLAG_SLAVE_POSS,
+			.pio_mask = ATA_PIO4,
+			.mwdma_mask = ATA_MWDMA2,
+			.port_ops = &cmd64x_port_ops
+		},
+		{	/* CMD 646 with broken UDMA */
+			.flags = ATA_FLAG_SLAVE_POSS,
+			.pio_mask = ATA_PIO4,
+			.mwdma_mask = ATA_MWDMA2,
+			.port_ops = &cmd64x_port_ops
+		},
+		{	/* CMD 646U with broken UDMA */
+			.flags = ATA_FLAG_SLAVE_POSS,
+			.pio_mask = ATA_PIO4,
+			.mwdma_mask = ATA_MWDMA2,
+			.port_ops = &cmd646r3_port_ops
+		},
+		{	/* CMD 646U2 with working UDMA */
+			.flags = ATA_FLAG_SLAVE_POSS,
+			.pio_mask = ATA_PIO4,
+			.mwdma_mask = ATA_MWDMA2,
+			.udma_mask = ATA_UDMA2,
+			.port_ops = &cmd646r3_port_ops
+		},
+		{	/* CMD 646 rev 1  */
+			.flags = ATA_FLAG_SLAVE_POSS,
+			.pio_mask = ATA_PIO4,
+			.mwdma_mask = ATA_MWDMA2,
+			.port_ops = &cmd646r1_port_ops
+		},
+		{	/* CMD 648 */
+			.flags = ATA_FLAG_SLAVE_POSS,
+			.pio_mask = ATA_PIO4,
+			.mwdma_mask = ATA_MWDMA2,
+			.udma_mask = ATA_UDMA4,
+			.port_ops = &cmd648_port_ops
+		},
+		{	/* CMD 649 */
+			.flags = ATA_FLAG_SLAVE_POSS,
+			.pio_mask = ATA_PIO4,
+			.mwdma_mask = ATA_MWDMA2,
+			.udma_mask = ATA_UDMA5,
+			.port_ops = &cmd648_port_ops
+		}
+	};
+	const struct ata_port_info *ppi[] = {
+		&cmd_info[id->driver_data],
+		&cmd_info[id->driver_data],
+		NULL
+	};
+	u8 reg;
+	int rc;
+	struct pci_dev *bridge = pdev->bus->self;
+	/* mobility split bridges don't report enabled ports correctly */
+	int port_ok = !(bridge && bridge->vendor ==
+			PCI_VENDOR_ID_MOBILITY_ELECTRONICS);
+	/* all (with exceptions below) apart from 643 have CNTRL_CH0 bit */
+	int cntrl_ch0_ok = (id->driver_data != 0);
+
+	rc = pcim_enable_device(pdev);
+	if (rc)
+		return rc;
+
+	if (id->driver_data == 0)	/* 643 */
+		ata_pci_bmdma_clear_simplex(pdev);
+
+	if (pdev->device == PCI_DEVICE_ID_CMD_646)
+		switch (pdev->revision) {
+		/* UDMA works since rev 5 */
+		default:
+			ppi[0] = &cmd_info[3];
+			ppi[1] = &cmd_info[3];
+			break;
+		/* Interrupts in MRDMODE since rev 3 */
+		case 3:
+		case 4:
+			ppi[0] = &cmd_info[2];
+			ppi[1] = &cmd_info[2];
+			break;
+		/* Rev 1 with other problems? */
+		case 1:
+			ppi[0] = &cmd_info[4];
+			ppi[1] = &cmd_info[4];
+			/* FALL THRU */
+		/* Early revs have no CNTRL_CH0 */
+		case 2:
+		case 0:
+			cntrl_ch0_ok = 0;
+			break;
+		}
+
+	cmd64x_fixup(pdev);
+
+	/* check for enabled ports */
+	pci_read_config_byte(pdev, CNTRL, &reg);
+	if (!port_ok)
+		dev_notice(&pdev->dev, "Mobility Bridge detected, ignoring CNTRL port enable/disable\n");
+	if (port_ok && cntrl_ch0_ok && !(reg & CNTRL_CH0)) {
+		dev_notice(&pdev->dev, "Primary port is disabled\n");
+		ppi[0] = &ata_dummy_port_info;
+
+	}
+	if (port_ok && !(reg & CNTRL_CH1)) {
+		dev_notice(&pdev->dev, "Secondary port is disabled\n");
+		ppi[1] = &ata_dummy_port_info;
+	}
+
+	return ata_pci_bmdma_init_one(pdev, ppi, &cmd64x_sht, NULL, 0);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int cmd64x_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;
+
+	cmd64x_fixup(pdev);
+
+	ata_host_resume(host);
+	return 0;
+}
+#endif
+
+static const struct pci_device_id cmd64x[] = {
+	{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_643), 0 },
+	{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_646), 1 },
+	{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_648), 5 },
+	{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_649), 6 },
+
+	{ },
+};
+
+static struct pci_driver cmd64x_pci_driver = {
+	.name 		= DRV_NAME,
+	.id_table	= cmd64x,
+	.probe 		= cmd64x_init_one,
+	.remove		= ata_pci_remove_one,
+#ifdef CONFIG_PM_SLEEP
+	.suspend	= ata_pci_device_suspend,
+	.resume		= cmd64x_reinit_one,
+#endif
+};
+
+module_pci_driver(cmd64x_pci_driver);
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("low-level driver for CMD64x series PATA controllers");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, cmd64x);
+MODULE_VERSION(DRV_VERSION);