[libata] Add a bunch of PATA drivers.

The vast majority of drivers and changes are from Alan Cox.  Albert Lee
contributed and maintains pata_pdc2027x.  Adrian Bunk, Andrew Morton,
and Tejun Heo contributed various minor fixes and updates.

Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 292 insertions, 0 deletions

diff --git a/drivers/ata/pata_opti.c b/drivers/ata/pata_opti.c
new file mode 100644
index 000000000000..c3d01325e0e2
--- /dev/null
+++ b/drivers/ata/pata_opti.c
@@ -0,0 +1,292 @@
+/*
+ * pata_opti.c 	- ATI PATA for new ATA layer
+ *			  (C) 2005 Red Hat Inc
+ *			  Alan Cox <alan@redhat.com>
+ *
+ * Based on
+ *  linux/drivers/ide/pci/opti621.c		Version 0.7	Sept 10, 2002
+ *
+ *  Copyright (C) 1996-1998  Linus Torvalds & authors (see below)
+ *
+ * Authors:
+ * Jaromir Koutek <miri@punknet.cz>,
+ * Jan Harkes <jaharkes@cwi.nl>,
+ * Mark Lord <mlord@pobox.com>
+ * Some parts of code are from ali14xx.c and from rz1000.c.
+ *
+ * Also consulted the FreeBSD prototype driver by Kevin Day to try
+ * and resolve some confusions. Further documentation can be found in
+ * Ralf Brown's interrupt list
+ *
+ * If you have other variants of the Opti range (Viper/Vendetta) please
+ * try this driver with those PCI idents and report back. For the later
+ * chips see the pata_optidma driver
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+
+#define DRV_NAME "pata_opti"
+#define DRV_VERSION "0.2.4"
+
+enum {
+	READ_REG	= 0,	/* index of Read cycle timing register */
+	WRITE_REG 	= 1,	/* index of Write cycle timing register */
+	CNTRL_REG 	= 3,	/* index of Control register */
+	STRAP_REG 	= 5,	/* index of Strap register */
+	MISC_REG 	= 6	/* index of Miscellaneous register */
+};
+
+/**
+ *	opti_pre_reset		-	probe begin
+ *	@ap: ATA port
+ *
+ *	Set up cable type and use generic probe init
+ */
+
+static int opti_pre_reset(struct ata_port *ap)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	static const struct pci_bits opti_enable_bits[] = {
+		{ 0x45, 1, 0x80, 0x00 },
+		{ 0x40, 1, 0x08, 0x00 }
+	};
+
+	if (!pci_test_config_bits(pdev, &opti_enable_bits[ap->port_no])) {
+		ata_port_disable(ap);
+		printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
+		return 0;
+	}
+	ap->cbl = ATA_CBL_PATA40;
+	return ata_std_prereset(ap);
+}
+
+/**
+ *	opti_probe_reset		-	probe reset
+ *	@ap: ATA port
+ *
+ *	Perform the ATA probe and bus reset sequence plus specific handling
+ *	for this hardware. The Opti needs little handling - we have no UDMA66
+ *	capability that needs cable detection. All we must do is check the port
+ *	is enabled.
+ */
+
+static void opti_error_handler(struct ata_port *ap)
+{
+	ata_bmdma_drive_eh(ap, opti_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
+}
+
+/**
+ *	opti_write_reg		-	control register setup
+ *	@ap: ATA port
+ *	@value: value
+ *	@reg: control register number
+ *
+ *	The Opti uses magic 'trapdoor' register accesses to do configuration
+ *	rather than using PCI space as other controllers do. The double inw
+ *	on the error register activates configuration mode. We can then write
+ *	the control register
+ */
+
+static void opti_write_reg(struct ata_port *ap, u8 val, int reg)
+{
+	unsigned long regio = ap->ioaddr.cmd_addr;
+
+	/* These 3 unlock the control register access */
+	inw(regio + 1);
+	inw(regio + 1);
+	outb(3, regio + 2);
+
+	/* Do the I/O */
+	outb(val, regio + reg);
+
+	/* Relock */
+	outb(0x83, regio + 2);
+}
+
+#if 0
+/**
+ *	opti_read_reg		-	control register read
+ *	@ap: ATA port
+ *	@reg: control register number
+ *
+ *	The Opti uses magic 'trapdoor' register accesses to do configuration
+ *	rather than using PCI space as other controllers do. The double inw
+ *	on the error register activates configuration mode. We can then read
+ *	the control register
+ */
+
+static u8 opti_read_reg(struct ata_port *ap, int reg)
+{
+	unsigned long regio = ap->ioaddr.cmd_addr;
+	u8 ret;
+	inw(regio + 1);
+	inw(regio + 1);
+	outb(3, regio + 2);
+	ret = inb(regio + reg);
+	outb(0x83, regio + 2);
+}
+#endif
+
+/**
+ *	opti_set_piomode	-	set initial PIO mode data
+ *	@ap: ATA interface
+ *	@adev: ATA device
+ *
+ *	Called to do the PIO mode setup. Timing numbers are taken from
+ *	the FreeBSD driver then pre computed to keep the code clean. There
+ *	are two tables depending on the hardware clock speed.
+ */
+
+static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+	struct ata_device *pair = ata_dev_pair(adev);
+	int clock;
+	int pio = adev->pio_mode - XFER_PIO_0;
+	unsigned long regio = ap->ioaddr.cmd_addr;
+	u8 addr;
+
+	/* Address table precomputed with prefetch off and a DCLK of 2 */
+	static const u8 addr_timing[2][5] = {
+		{ 0x30, 0x20, 0x20, 0x10, 0x10 },
+		{ 0x20, 0x20, 0x10, 0x10, 0x10 }
+	};
+	static const u8 data_rec_timing[2][5] = {
+		{ 0x6B, 0x56, 0x42, 0x32, 0x31 },
+		{ 0x58, 0x44, 0x32, 0x22, 0x21 }
+	};
+
+	outb(0xff, regio + 5);
+	clock = inw(regio + 5) & 1;
+
+	/*
+ 	 *	As with many controllers the address setup time is shared
+ 	 *	and must suit both devices if present.
+	 */
+
+	addr = addr_timing[clock][pio];
+	if (pair) {
+		/* Hardware constraint */
+		u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0];
+		if (pair_addr > addr)
+			addr = pair_addr;
+	}
+
+	/* Commence primary programming sequence */
+	opti_write_reg(ap, adev->devno, MISC_REG);
+	opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG);
+	opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG);
+	opti_write_reg(ap, addr, MISC_REG);
+
+	/* Programming sequence complete, override strapping */
+	opti_write_reg(ap, 0x85, CNTRL_REG);
+}
+
+static struct scsi_host_template opti_sht = {
+	.module			= THIS_MODULE,
+	.name			= DRV_NAME,
+	.ioctl			= ata_scsi_ioctl,
+	.queuecommand		= ata_scsi_queuecmd,
+	.can_queue		= ATA_DEF_QUEUE,
+	.this_id		= ATA_SHT_THIS_ID,
+	.sg_tablesize		= LIBATA_MAX_PRD,
+	.max_sectors		= ATA_MAX_SECTORS,
+	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
+	.emulated		= ATA_SHT_EMULATED,
+	.use_clustering		= ATA_SHT_USE_CLUSTERING,
+	.proc_name		= DRV_NAME,
+	.dma_boundary		= ATA_DMA_BOUNDARY,
+	.slave_configure	= ata_scsi_slave_config,
+	.bios_param		= ata_std_bios_param,
+};
+
+static struct ata_port_operations opti_port_ops = {
+	.port_disable	= ata_port_disable,
+	.set_piomode	= opti_set_piomode,
+/*	.set_dmamode	= opti_set_dmamode, */
+	.tf_load	= ata_tf_load,
+	.tf_read	= ata_tf_read,
+	.check_status 	= ata_check_status,
+	.exec_command	= ata_exec_command,
+	.dev_select 	= ata_std_dev_select,
+
+	.freeze		= ata_bmdma_freeze,
+	.thaw		= ata_bmdma_thaw,
+	.error_handler	= opti_error_handler,
+	.post_internal_cmd = ata_bmdma_post_internal_cmd,
+
+	.bmdma_setup 	= ata_bmdma_setup,
+	.bmdma_start 	= ata_bmdma_start,
+	.bmdma_stop	= ata_bmdma_stop,
+	.bmdma_status 	= ata_bmdma_status,
+
+	.qc_prep 	= ata_qc_prep,
+	.qc_issue	= ata_qc_issue_prot,
+	.eng_timeout	= ata_eng_timeout,
+	.data_xfer	= ata_pio_data_xfer,
+
+	.irq_handler	= ata_interrupt,
+	.irq_clear	= ata_bmdma_irq_clear,
+
+	.port_start	= ata_port_start,
+	.port_stop	= ata_port_stop,
+	.host_stop	= ata_host_stop
+};
+
+static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+	static struct ata_port_info info = {
+		.sht = &opti_sht,
+		.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
+		.pio_mask = 0x1f,
+		.port_ops = &opti_port_ops
+	};
+	static struct ata_port_info *port_info[2] = { &info, &info };
+	static int printed_version;
+
+	if (!printed_version++)
+		dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");
+
+	return ata_pci_init_one(dev, port_info, 2);
+}
+
+static const struct pci_device_id opti[] = {
+	{ PCI_VENDOR_ID_OPTI, PCI_DEVICE_ID_OPTI_82C621, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+	{ PCI_VENDOR_ID_OPTI, PCI_DEVICE_ID_OPTI_82C825, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 1},
+	{ 0, },
+};
+
+static struct pci_driver opti_pci_driver = {
+        .name 		= DRV_NAME,
+	.id_table	= opti,
+	.probe 		= opti_init_one,
+	.remove		= ata_pci_remove_one
+};
+
+static int __init opti_init(void)
+{
+	return pci_register_driver(&opti_pci_driver);
+}
+
+
+static void __exit opti_exit(void)
+{
+	pci_unregister_driver(&opti_pci_driver);
+}
+
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("low-level driver for Opti 621/621X");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, opti);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(opti_init);
+module_exit(opti_exit);