[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, 342 insertions, 0 deletions

diff --git a/drivers/ata/pata_efar.c b/drivers/ata/pata_efar.c
new file mode 100644
index 00000000000..c30bc181304
--- /dev/null
+++ b/drivers/ata/pata_efar.c
@@ -0,0 +1,342 @@
+/*
+ *    pata_efar.c - EFAR PIIX clone controller driver
+ *
+ *	(C) 2005 Red Hat <alan@redhat.com>
+ *
+ *    Some parts based on ata_piix.c by Jeff Garzik and others.
+ *
+ *    The EFAR is a PIIX4 clone with UDMA66 support. Unlike the later
+ *    Intel ICH controllers the EFAR widened the UDMA mode register bits
+ *    and doesn't require the funky clock selection.
+ */
+
+#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 <linux/device.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+#include <linux/ata.h>
+
+#define DRV_NAME	"pata_efar"
+#define DRV_VERSION	"0.4.1"
+
+/**
+ *	efar_pre_reset	-	check for 40/80 pin
+ *	@ap: Port
+ *
+ *	Perform cable detection for the EFAR ATA interface. This is
+ *	different to the PIIX arrangement
+ */
+
+static int efar_pre_reset(struct ata_port *ap)
+{
+	static const struct pci_bits efar_enable_bits[] = {
+		{ 0x41U, 1U, 0x80UL, 0x80UL },	/* port 0 */
+		{ 0x43U, 1U, 0x80UL, 0x80UL },	/* port 1 */
+	};
+
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	u8 tmp;
+
+	if (!pci_test_config_bits(pdev, &efar_enable_bits[ap->port_no])) {
+		ata_port_disable(ap);
+		printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
+		return 0;
+	}
+	pci_read_config_byte(pdev, 0x47, &tmp);
+	if (tmp & (2 >> ap->port_no))
+		ap->cbl = ATA_CBL_PATA40;
+	else
+		ap->cbl = ATA_CBL_PATA80;
+	return ata_std_prereset(ap);
+}
+
+/**
+ *	efar_probe_reset - Probe specified port on PATA host controller
+ *	@ap: Port to probe
+ *
+ *	LOCKING:
+ *	None (inherited from caller).
+ */
+
+static void efar_error_handler(struct ata_port *ap)
+{
+	ata_bmdma_drive_eh(ap, efar_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
+}
+
+/**
+ *	efar_set_piomode - Initialize host controller PATA PIO timings
+ *	@ap: Port whose timings we are configuring
+ *	@adev: um
+ *
+ *	Set PIO mode for device, in host controller PCI config space.
+ *
+ *	LOCKING:
+ *	None (inherited from caller).
+ */
+
+static void efar_set_piomode (struct ata_port *ap, struct ata_device *adev)
+{
+	unsigned int pio	= adev->pio_mode - XFER_PIO_0;
+	struct pci_dev *dev	= to_pci_dev(ap->host->dev);
+	unsigned int idetm_port= ap->port_no ? 0x42 : 0x40;
+	u16 idetm_data;
+	int control = 0;
+
+	/*
+	 *	See Intel Document 298600-004 for the timing programing rules
+	 *	for PIIX/ICH. The EFAR is a clone so very similar
+	 */
+
+	static const	 /* ISP  RTC */
+	u8 timings[][2]	= { { 0, 0 },
+			    { 0, 0 },
+			    { 1, 0 },
+			    { 2, 1 },
+			    { 2, 3 }, };
+
+	if (pio > 2)
+		control |= 1;	/* TIME1 enable */
+	if (ata_pio_need_iordy(adev))	/* PIO 3/4 require IORDY */
+		control |= 2;	/* IE enable */
+	/* Intel specifies that the PPE functionality is for disk only */
+	if (adev->class == ATA_DEV_ATA)
+		control |= 4;	/* PPE enable */
+
+	pci_read_config_word(dev, idetm_port, &idetm_data);
+
+	/* Enable PPE, IE and TIME as appropriate */
+
+	if (adev->devno == 0) {
+		idetm_data &= 0xCCF0;
+		idetm_data |= control;
+		idetm_data |= (timings[pio][0] << 12) |
+			(timings[pio][1] << 8);
+	} else {
+		int shift = 4 * ap->port_no;
+		u8 slave_data;
+
+		idetm_data &= 0xCC0F;
+		idetm_data |= (control << 4);
+
+		/* Slave timing in seperate register */
+		pci_read_config_byte(dev, 0x44, &slave_data);
+		slave_data &= 0x0F << shift;
+		slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << shift;
+		pci_write_config_byte(dev, 0x44, slave_data);
+	}
+
+	idetm_data |= 0x4000;	/* Ensure SITRE is enabled */
+	pci_write_config_word(dev, idetm_port, idetm_data);
+}
+
+/**
+ *	efar_set_dmamode - Initialize host controller PATA DMA timings
+ *	@ap: Port whose timings we are configuring
+ *	@adev: Device to program
+ *
+ *	Set UDMA/MWDMA mode for device, in host controller PCI config space.
+ *
+ *	LOCKING:
+ *	None (inherited from caller).
+ */
+
+static void efar_set_dmamode (struct ata_port *ap, struct ata_device *adev)
+{
+	struct pci_dev *dev	= to_pci_dev(ap->host->dev);
+	u8 master_port		= ap->port_no ? 0x42 : 0x40;
+	u16 master_data;
+	u8 speed		= adev->dma_mode;
+	int devid		= adev->devno + 2 * ap->port_no;
+	u8 udma_enable;
+
+	static const	 /* ISP  RTC */
+	u8 timings[][2]	= { { 0, 0 },
+			    { 0, 0 },
+			    { 1, 0 },
+			    { 2, 1 },
+			    { 2, 3 }, };
+
+	pci_read_config_word(dev, master_port, &master_data);
+	pci_read_config_byte(dev, 0x48, &udma_enable);
+
+	if (speed >= XFER_UDMA_0) {
+		unsigned int udma	= adev->dma_mode - XFER_UDMA_0;
+		u16 udma_timing;
+
+		udma_enable |= (1 << devid);
+
+		/* Load the UDMA mode number */
+		pci_read_config_word(dev, 0x4A, &udma_timing);
+		udma_timing &= ~(7 << (4 * devid));
+		udma_timing |= udma << (4 * devid);
+		pci_write_config_word(dev, 0x4A, udma_timing);
+	} else {
+		/*
+		 * MWDMA is driven by the PIO timings. We must also enable
+		 * IORDY unconditionally along with TIME1. PPE has already
+		 * been set when the PIO timing was set.
+		 */
+		unsigned int mwdma	= adev->dma_mode - XFER_MW_DMA_0;
+		unsigned int control;
+		u8 slave_data;
+		const unsigned int needed_pio[3] = {
+			XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
+		};
+		int pio = needed_pio[mwdma] - XFER_PIO_0;
+
+		control = 3;	/* IORDY|TIME1 */
+
+		/* If the drive MWDMA is faster than it can do PIO then
+		   we must force PIO into PIO0 */
+
+		if (adev->pio_mode < needed_pio[mwdma])
+			/* Enable DMA timing only */
+			control |= 8;	/* PIO cycles in PIO0 */
+
+		if (adev->devno) {	/* Slave */
+			master_data &= 0xFF4F;  /* Mask out IORDY|TIME1|DMAONLY */
+			master_data |= control << 4;
+			pci_read_config_byte(dev, 0x44, &slave_data);
+			slave_data &= (0x0F + 0xE1 * ap->port_no);
+			/* Load the matching timing */
+			slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0);
+			pci_write_config_byte(dev, 0x44, slave_data);
+		} else { 	/* Master */
+			master_data &= 0xCCF4;	/* Mask out IORDY|TIME1|DMAONLY
+						   and master timing bits */
+			master_data |= control;
+			master_data |=
+				(timings[pio][0] << 12) |
+				(timings[pio][1] << 8);
+		}
+		udma_enable &= ~(1 << devid);
+		pci_write_config_word(dev, master_port, master_data);
+	}
+	pci_write_config_byte(dev, 0x48, udma_enable);
+}
+
+static struct scsi_host_template efar_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 const struct ata_port_operations efar_ops = {
+	.port_disable		= ata_port_disable,
+	.set_piomode		= efar_set_piomode,
+	.set_dmamode		= efar_set_dmamode,
+	.mode_filter		= ata_pci_default_filter,
+
+	.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		= efar_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,
+	.data_xfer		= ata_pio_data_xfer,
+
+	.eng_timeout		= ata_eng_timeout,
+
+	.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,
+};
+
+
+/**
+ *	efar_init_one - Register EFAR ATA PCI device with kernel services
+ *	@pdev: PCI device to register
+ *	@ent: Entry in efar_pci_tbl matching with @pdev
+ *
+ *	Called from kernel PCI layer.
+ *
+ *	LOCKING:
+ *	Inherited from PCI layer (may sleep).
+ *
+ *	RETURNS:
+ *	Zero on success, or -ERRNO value.
+ */
+
+static int efar_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	static int printed_version;
+	static struct ata_port_info info = {
+		.sht		= &efar_sht,
+		.flags		= ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
+		.pio_mask	= 0x1f,	/* pio0-4 */
+		.mwdma_mask	= 0x07, /* mwdma1-2 */
+		.udma_mask 	= 0x0f, /* UDMA 66 */
+		.port_ops	= &efar_ops,
+	};
+	static struct ata_port_info *port_info[2] = { &info, &info };
+
+	if (!printed_version++)
+		dev_printk(KERN_DEBUG, &pdev->dev,
+			   "version " DRV_VERSION "\n");
+
+	return ata_pci_init_one(pdev, port_info, 2);
+}
+
+static const struct pci_device_id efar_pci_tbl[] = {
+	{ 0x1055, 0x9130, PCI_ANY_ID, PCI_ANY_ID, },
+	{ }	/* terminate list */
+};
+
+static struct pci_driver efar_pci_driver = {
+	.name			= DRV_NAME,
+	.id_table		= efar_pci_tbl,
+	.probe			= efar_init_one,
+	.remove			= ata_pci_remove_one,
+};
+
+static int __init efar_init(void)
+{
+	return pci_register_driver(&efar_pci_driver);
+}
+
+static void __exit efar_exit(void)
+{
+	pci_unregister_driver(&efar_pci_driver);
+}
+
+
+module_init(efar_init);
+module_exit(efar_exit);
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("SCSI low-level driver for EFAR PIIX clones");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, efar_pci_tbl);
+MODULE_VERSION(DRV_VERSION);
+