1 files changed, 349 insertions, 0 deletions

diff --git a/drivers/ide/ns87415.c b/drivers/ide/ns87415.c
new file mode 100644
index 00000000..95327a2c
--- /dev/null
+++ b/drivers/ide/ns87415.c
@@ -0,0 +1,349 @@
+/*
+ * Copyright (C) 1997-1998	Mark Lord <mlord@pobox.com>
+ * Copyright (C) 1998		Eddie C. Dost <ecd@skynet.be>
+ * Copyright (C) 1999-2000	Andre Hedrick <andre@linux-ide.org>
+ * Copyright (C) 2004		Grant Grundler <grundler at parisc-linux.org>
+ *
+ * Inspired by an earlier effort from David S. Miller <davem@redhat.com>
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/ide.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+
+#define DRV_NAME "ns87415"
+
+#ifdef CONFIG_SUPERIO
+/* SUPERIO 87560 is a PoS chip that NatSem denies exists.
+ * Unfortunately, it's built-in on all Astro-based PA-RISC workstations
+ * which use the integrated NS87514 cell for CD-ROM support.
+ * i.e we have to support for CD-ROM installs.
+ * See drivers/parisc/superio.c for more gory details.
+ */
+#include <asm/superio.h>
+
+#define SUPERIO_IDE_MAX_RETRIES 25
+
+/* Because of a defect in Super I/O, all reads of the PCI DMA status 
+ * registers, IDE status register and the IDE select register need to be 
+ * retried
+ */
+static u8 superio_ide_inb (unsigned long port)
+{
+	u8 tmp;
+	int retries = SUPERIO_IDE_MAX_RETRIES;
+
+	/* printk(" [ reading port 0x%x with retry ] ", port); */
+
+	do {
+		tmp = inb(port);
+		if (tmp == 0)
+			udelay(50);
+	} while (tmp == 0 && retries-- > 0);
+
+	return tmp;
+}
+
+static u8 superio_read_status(ide_hwif_t *hwif)
+{
+	return superio_ide_inb(hwif->io_ports.status_addr);
+}
+
+static u8 superio_dma_sff_read_status(ide_hwif_t *hwif)
+{
+	return superio_ide_inb(hwif->dma_base + ATA_DMA_STATUS);
+}
+
+static void superio_tf_read(ide_drive_t *drive, struct ide_taskfile *tf,
+			    u8 valid)
+{
+	struct ide_io_ports *io_ports = &drive->hwif->io_ports;
+
+	if (valid & IDE_VALID_ERROR)
+		tf->error  = inb(io_ports->feature_addr);
+	if (valid & IDE_VALID_NSECT)
+		tf->nsect  = inb(io_ports->nsect_addr);
+	if (valid & IDE_VALID_LBAL)
+		tf->lbal   = inb(io_ports->lbal_addr);
+	if (valid & IDE_VALID_LBAM)
+		tf->lbam   = inb(io_ports->lbam_addr);
+	if (valid & IDE_VALID_LBAH)
+		tf->lbah   = inb(io_ports->lbah_addr);
+	if (valid & IDE_VALID_DEVICE)
+		tf->device = superio_ide_inb(io_ports->device_addr);
+}
+
+static void ns87415_dev_select(ide_drive_t *drive);
+
+static const struct ide_tp_ops superio_tp_ops = {
+	.exec_command		= ide_exec_command,
+	.read_status		= superio_read_status,
+	.read_altstatus		= ide_read_altstatus,
+	.write_devctl		= ide_write_devctl,
+
+	.dev_select		= ns87415_dev_select,
+	.tf_load		= ide_tf_load,
+	.tf_read		= superio_tf_read,
+
+	.input_data		= ide_input_data,
+	.output_data		= ide_output_data,
+};
+
+static void __devinit superio_init_iops(struct hwif_s *hwif)
+{
+	struct pci_dev *pdev = to_pci_dev(hwif->dev);
+	u32 dma_stat;
+	u8 port = hwif->channel, tmp;
+
+	dma_stat = (pci_resource_start(pdev, 4) & ~3) + (!port ? 2 : 0xa);
+
+	/* Clear error/interrupt, enable dma */
+	tmp = superio_ide_inb(dma_stat);
+	outb(tmp | 0x66, dma_stat);
+}
+#else
+#define superio_dma_sff_read_status ide_dma_sff_read_status
+#endif
+
+static unsigned int ns87415_count = 0, ns87415_control[MAX_HWIFS] = { 0 };
+
+/*
+ * This routine either enables/disables (according to IDE_DFLAG_PRESENT)
+ * the IRQ associated with the port,
+ * and selects either PIO or DMA handshaking for the next I/O operation.
+ */
+static void ns87415_prepare_drive (ide_drive_t *drive, unsigned int use_dma)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	struct pci_dev *dev = to_pci_dev(hwif->dev);
+	unsigned int bit, other, new, *old = (unsigned int *) hwif->select_data;
+	unsigned long flags;
+
+	local_irq_save(flags);
+	new = *old;
+
+	/* Adjust IRQ enable bit */
+	bit = 1 << (8 + hwif->channel);
+
+	if (drive->dev_flags & IDE_DFLAG_PRESENT)
+		new &= ~bit;
+	else
+		new |= bit;
+
+	/* Select PIO or DMA, DMA may only be selected for one drive/channel. */
+	bit   = 1 << (20 + (drive->dn & 1) + (hwif->channel << 1));
+	other = 1 << (20 + (1 - (drive->dn & 1)) + (hwif->channel << 1));
+	new = use_dma ? ((new & ~other) | bit) : (new & ~bit);
+
+	if (new != *old) {
+		unsigned char stat;
+
+		/*
+		 * Don't change DMA engine settings while Write Buffers
+		 * are busy.
+		 */
+		(void) pci_read_config_byte(dev, 0x43, &stat);
+		while (stat & 0x03) {
+			udelay(1);
+			(void) pci_read_config_byte(dev, 0x43, &stat);
+		}
+
+		*old = new;
+		(void) pci_write_config_dword(dev, 0x40, new);
+
+		/*
+		 * And let things settle...
+		 */
+		udelay(10);
+	}
+
+	local_irq_restore(flags);
+}
+
+static void ns87415_dev_select(ide_drive_t *drive)
+{
+	ns87415_prepare_drive(drive,
+			      !!(drive->dev_flags & IDE_DFLAG_USING_DMA));
+
+	outb(drive->select | ATA_DEVICE_OBS, drive->hwif->io_ports.device_addr);
+}
+
+static void ns87415_dma_start(ide_drive_t *drive)
+{
+	ns87415_prepare_drive(drive, 1);
+	ide_dma_start(drive);
+}
+
+static int ns87415_dma_end(ide_drive_t *drive)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	u8 dma_stat = 0, dma_cmd = 0;
+
+	dma_stat = hwif->dma_ops->dma_sff_read_status(hwif);
+	/* get DMA command mode */
+	dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
+	/* stop DMA */
+	outb(dma_cmd & ~1, hwif->dma_base + ATA_DMA_CMD);
+	/* from ERRATA: clear the INTR & ERROR bits */
+	dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
+	outb(dma_cmd | 6, hwif->dma_base + ATA_DMA_CMD);
+
+	ns87415_prepare_drive(drive, 0);
+
+	/* verify good DMA status */
+	return (dma_stat & 7) != 4;
+}
+
+static void __devinit init_hwif_ns87415 (ide_hwif_t *hwif)
+{
+	struct pci_dev *dev = to_pci_dev(hwif->dev);
+	unsigned int ctrl, using_inta;
+	u8 progif;
+#ifdef __sparc_v9__
+	int timeout;
+	u8 stat;
+#endif
+
+	/*
+	 * We cannot probe for IRQ: both ports share common IRQ on INTA.
+	 * Also, leave IRQ masked during drive probing, to prevent infinite
+	 * interrupts from a potentially floating INTA..
+	 *
+	 * IRQs get unmasked in dev_select() when drive is first used.
+	 */
+	(void) pci_read_config_dword(dev, 0x40, &ctrl);
+	(void) pci_read_config_byte(dev, 0x09, &progif);
+	/* is irq in "native" mode? */
+	using_inta = progif & (1 << (hwif->channel << 1));
+	if (!using_inta)
+		using_inta = ctrl & (1 << (4 + hwif->channel));
+	if (hwif->mate) {
+		hwif->select_data = hwif->mate->select_data;
+	} else {
+		hwif->select_data = (unsigned long)
+					&ns87415_control[ns87415_count++];
+		ctrl |= (1 << 8) | (1 << 9);	/* mask both IRQs */
+		if (using_inta)
+			ctrl &= ~(1 << 6);	/* unmask INTA */
+		*((unsigned int *)hwif->select_data) = ctrl;
+		(void) pci_write_config_dword(dev, 0x40, ctrl);
+
+		/*
+		 * Set prefetch size to 512 bytes for both ports,
+		 * but don't turn on/off prefetching here.
+		 */
+		pci_write_config_byte(dev, 0x55, 0xee);
+
+#ifdef __sparc_v9__
+		/*
+		 * XXX: Reset the device, if we don't it will not respond to
+		 *      dev_select() properly during first ide_probe_port().
+		 */
+		timeout = 10000;
+		outb(12, hwif->io_ports.ctl_addr);
+		udelay(10);
+		outb(8, hwif->io_ports.ctl_addr);
+		do {
+			udelay(50);
+			stat = hwif->tp_ops->read_status(hwif);
+			if (stat == 0xff)
+				break;
+		} while ((stat & ATA_BUSY) && --timeout);
+#endif
+	}
+
+	if (!using_inta)
+		hwif->irq = pci_get_legacy_ide_irq(dev, hwif->channel);
+
+	if (!hwif->dma_base)
+		return;
+
+	outb(0x60, hwif->dma_base + ATA_DMA_STATUS);
+}
+
+static const struct ide_tp_ops ns87415_tp_ops = {
+	.exec_command		= ide_exec_command,
+	.read_status		= ide_read_status,
+	.read_altstatus		= ide_read_altstatus,
+	.write_devctl		= ide_write_devctl,
+
+	.dev_select		= ns87415_dev_select,
+	.tf_load		= ide_tf_load,
+	.tf_read		= ide_tf_read,
+
+	.input_data		= ide_input_data,
+	.output_data		= ide_output_data,
+};
+
+static const struct ide_dma_ops ns87415_dma_ops = {
+	.dma_host_set		= ide_dma_host_set,
+	.dma_setup		= ide_dma_setup,
+	.dma_start		= ns87415_dma_start,
+	.dma_end		= ns87415_dma_end,
+	.dma_test_irq		= ide_dma_test_irq,
+	.dma_lost_irq		= ide_dma_lost_irq,
+	.dma_timer_expiry	= ide_dma_sff_timer_expiry,
+	.dma_sff_read_status	= superio_dma_sff_read_status,
+};
+
+static const struct ide_port_info ns87415_chipset __devinitdata = {
+	.name		= DRV_NAME,
+	.init_hwif	= init_hwif_ns87415,
+	.tp_ops 	= &ns87415_tp_ops,
+	.dma_ops	= &ns87415_dma_ops,
+	.host_flags	= IDE_HFLAG_TRUST_BIOS_FOR_DMA |
+			  IDE_HFLAG_NO_ATAPI_DMA,
+};
+
+static int __devinit ns87415_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+	struct ide_port_info d = ns87415_chipset;
+
+#ifdef CONFIG_SUPERIO
+	if (PCI_SLOT(dev->devfn) == 0xE) {
+		/* Built-in - assume it's under superio. */
+		d.init_iops = superio_init_iops;
+		d.tp_ops = &superio_tp_ops;
+	}
+#endif
+	return ide_pci_init_one(dev, &d, NULL);
+}
+
+static const struct pci_device_id ns87415_pci_tbl[] = {
+	{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87415), 0 },
+	{ 0, },
+};
+MODULE_DEVICE_TABLE(pci, ns87415_pci_tbl);
+
+static struct pci_driver ns87415_pci_driver = {
+	.name		= "NS87415_IDE",
+	.id_table	= ns87415_pci_tbl,
+	.probe		= ns87415_init_one,
+	.remove		= ide_pci_remove,
+	.suspend	= ide_pci_suspend,
+	.resume		= ide_pci_resume,
+};
+
+static int __init ns87415_ide_init(void)
+{
+	return ide_pci_register_driver(&ns87415_pci_driver);
+}
+
+static void __exit ns87415_ide_exit(void)
+{
+	pci_unregister_driver(&ns87415_pci_driver);
+}
+
+module_init(ns87415_ide_init);
+module_exit(ns87415_ide_exit);
+
+MODULE_AUTHOR("Mark Lord, Eddie Dost, Andre Hedrick");
+MODULE_DESCRIPTION("PCI driver module for NS87415 IDE");
+MODULE_LICENSE("GPL");