[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, 336 insertions, 0 deletions

diff --git a/drivers/ata/pata_cs5520.c b/drivers/ata/pata_cs5520.c
new file mode 100644
index 0000000..792ce48
--- /dev/null
+++ b/drivers/ata/pata_cs5520.c
@@ -0,0 +1,336 @@
+/*
+ *	IDE tuning and bus mastering support for the CS5510/CS5520
+ *	chipsets
+ *
+ *	The CS5510/CS5520 are slightly unusual devices. Unlike the
+ *	typical IDE controllers they do bus mastering with the drive in
+ *	PIO mode and smarter silicon.
+ *
+ *	The practical upshot of this is that we must always tune the
+ *	drive for the right PIO mode. We must also ignore all the blacklists
+ *	and the drive bus mastering DMA information. Also to confuse matters
+ *	further we can do DMA on PIO only drives.
+ *
+ *	DMA on the 5510 also requires we disable_hlt() during DMA on early
+ *	revisions.
+ *
+ *	*** This driver is strictly experimental ***
+ *
+ *	(c) Copyright Red Hat Inc 2002
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * Documentation:
+ *	Not publically available.
+ */
+#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_cs5520"
+#define DRV_VERSION	"0.6.2"
+
+struct pio_clocks
+{
+	int address;
+	int assert;
+	int recovery;
+};
+
+static const struct pio_clocks cs5520_pio_clocks[]={
+	{3, 6, 11},
+	{2, 5, 6},
+	{1, 4, 3},
+	{1, 3, 2},
+	{1, 2, 1}
+};
+
+/**
+ *	cs5520_set_timings	-	program PIO timings
+ *	@ap: ATA port
+ *	@adev: ATA device
+ *
+ *	Program the PIO mode timings for the controller according to the pio
+ *	clocking table.
+ */
+
+static void cs5520_set_timings(struct ata_port *ap, struct ata_device *adev, int pio)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	int slave = adev->devno;
+
+	pio -= XFER_PIO_0;
+
+	/* Channel command timing */
+	pci_write_config_byte(pdev, 0x62 + ap->port_no,
+				(cs5520_pio_clocks[pio].recovery << 4) |
+				(cs5520_pio_clocks[pio].assert));
+	/* FIXME: should these use address ? */
+	/* Read command timing */
+	pci_write_config_byte(pdev, 0x64 +  4*ap->port_no + slave,
+				(cs5520_pio_clocks[pio].recovery << 4) |
+				(cs5520_pio_clocks[pio].assert));
+	/* Write command timing */
+	pci_write_config_byte(pdev, 0x66 +  4*ap->port_no + slave,
+				(cs5520_pio_clocks[pio].recovery << 4) |
+				(cs5520_pio_clocks[pio].assert));
+}
+
+/**
+ *	cs5520_enable_dma	-	turn on DMA bits
+ *
+ *	Turn on the DMA bits for this disk. Needed because the BIOS probably
+ *	has not done the work for us. Belongs in the core SATA code.
+ */
+
+static void cs5520_enable_dma(struct ata_port *ap, struct ata_device *adev)
+{
+	/* Set the DMA enable/disable flag */
+	u8 reg = inb(ap->ioaddr.bmdma_addr + 0x02);
+	reg |= 1<<(adev->devno + 5);
+	outb(reg, ap->ioaddr.bmdma_addr + 0x02);
+}
+
+/**
+ *	cs5520_set_dmamode	-	program DMA timings
+ *	@ap: ATA port
+ *	@adev: ATA device
+ *
+ *	Program the DMA mode timings for the controller according to the pio
+ *	clocking table. Note that this device sets the DMA timings to PIO
+ *	mode values. This may seem bizarre but the 5520 architecture talks
+ *	PIO mode to the disk and DMA mode to the controller so the underlying
+ *	transfers are PIO timed.
+ */
+
+static void cs5520_set_dmamode(struct ata_port *ap, struct ata_device *adev)
+{
+	static const int dma_xlate[3] = { XFER_PIO_0, XFER_PIO_3, XFER_PIO_4 };
+	cs5520_set_timings(ap, adev, dma_xlate[adev->dma_mode]);
+	cs5520_enable_dma(ap, adev);
+}
+
+/**
+ *	cs5520_set_piomode	-	program PIO timings
+ *	@ap: ATA port
+ *	@adev: ATA device
+ *
+ *	Program the PIO mode timings for the controller according to the pio
+ *	clocking table. We know pio_mode will equal dma_mode because of the
+ *	CS5520 architecture. At least once we turned DMA on and wrote a
+ *	mode setter.
+ */
+
+static void cs5520_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+	cs5520_set_timings(ap, adev, adev->pio_mode);
+}
+
+
+static int cs5520_pre_reset(struct ata_port *ap)
+{
+	ap->cbl = ATA_CBL_PATA40;
+	return ata_std_prereset(ap);
+}
+
+static void cs5520_error_handler(struct ata_port *ap)
+{
+	return ata_bmdma_drive_eh(ap, cs5520_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
+}
+
+static struct scsi_host_template cs5520_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 cs5520_port_ops = {
+	.port_disable		= ata_port_disable,
+	.set_piomode		= cs5520_set_piomode,
+	.set_dmamode		= cs5520_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		= cs5520_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,
+};
+
+static int __devinit cs5520_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+	u8 pcicfg;
+	static struct ata_probe_ent probe[2];
+	int ports = 0;
+
+	/* IDE port enable bits */
+	pci_read_config_byte(dev, 0x60, &pcicfg);
+
+	/* Check if the ATA ports are enabled */
+	if ((pcicfg & 3) == 0)
+		return -ENODEV;
+
+	if ((pcicfg & 0x40) == 0) {
+		printk(KERN_WARNING DRV_NAME ": DMA mode disabled. Enabling.\n");
+		pci_write_config_byte(dev, 0x60, pcicfg | 0x40);
+	}
+
+	/* Perform set up for DMA */
+	if (pci_enable_device_bars(dev, 1<<2)) {
+		printk(KERN_ERR DRV_NAME ": unable to configure BAR2.\n");
+		return -ENODEV;
+	}
+	pci_set_master(dev);
+	if (pci_set_dma_mask(dev, DMA_32BIT_MASK)) {
+		printk(KERN_ERR DRV_NAME ": unable to configure DMA mask.\n");
+		return -ENODEV;
+	}
+	if (pci_set_consistent_dma_mask(dev, DMA_32BIT_MASK)) {
+		printk(KERN_ERR DRV_NAME ": unable to configure consistent DMA mask.\n");
+		return -ENODEV;
+	}
+
+	/* We have to do our own plumbing as the PCI setup for this
+	   chipset is non-standard so we can't punt to the libata code */
+
+	INIT_LIST_HEAD(&probe[0].node);
+	probe[0].dev = pci_dev_to_dev(dev);
+	probe[0].port_ops = &cs5520_port_ops;
+	probe[0].sht = &cs5520_sht;
+	probe[0].pio_mask = 0x1F;
+	probe[0].mwdma_mask = id->driver_data;
+	probe[0].irq = 14;
+	probe[0].irq_flags = 0;
+	probe[0].port_flags = ATA_FLAG_SLAVE_POSS|ATA_FLAG_SRST;
+	probe[0].n_ports = 1;
+	probe[0].port[0].cmd_addr = 0x1F0;
+	probe[0].port[0].ctl_addr = 0x3F6;
+	probe[0].port[0].altstatus_addr = 0x3F6;
+	probe[0].port[0].bmdma_addr = pci_resource_start(dev, 2);
+
+	/* The secondary lurks at different addresses but is otherwise
+	   the same beastie */
+
+	probe[1] = probe[0];
+	INIT_LIST_HEAD(&probe[1].node);
+	probe[1].irq = 15;
+	probe[1].port[0].cmd_addr = 0x170;
+	probe[1].port[0].ctl_addr = 0x376;
+	probe[1].port[0].altstatus_addr = 0x376;
+	probe[1].port[0].bmdma_addr = pci_resource_start(dev, 2) + 8;
+
+	/* Let libata fill in the port details */
+	ata_std_ports(&probe[0].port[0]);
+	ata_std_ports(&probe[1].port[0]);
+
+	/* Now add the ports that are active */
+	if (pcicfg & 1)
+		ports += ata_device_add(&probe[0]);
+	if (pcicfg & 2)
+		ports += ata_device_add(&probe[1]);
+	if (ports)
+		return 0;
+	return -ENODEV;
+}
+
+/**
+ *	cs5520_remove_one	-	device unload
+ *	@pdev: PCI device being removed
+ *
+ *	Handle an unplug/unload event for a PCI device. Unload the
+ *	PCI driver but do not use the default handler as we manage
+ *	resources ourself and *MUST NOT* disable the device as it has
+ *	other functions.
+ */
+
+static void __devexit cs5520_remove_one(struct pci_dev *pdev)
+{
+	struct device *dev = pci_dev_to_dev(pdev);
+	struct ata_host *host = dev_get_drvdata(dev);
+
+	ata_host_remove(host);
+	dev_set_drvdata(dev, NULL);
+}
+
+/* For now keep DMA off. We can set it for all but A rev CS5510 once the
+   core ATA code can handle it */
+
+static struct pci_device_id pata_cs5520[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5510), },
+	{ PCI_DEVICE(PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5520), },
+	{ 0, },
+};
+
+static struct pci_driver cs5520_pci_driver = {
+	.name 		= DRV_NAME,
+	.id_table	= pata_cs5520,
+	.probe 		= cs5520_init_one,
+	.remove		= cs5520_remove_one
+};
+
+
+static int __init cs5520_init(void)
+{
+	return pci_register_driver(&cs5520_pci_driver);
+}
+
+static void __exit cs5520_exit(void)
+{
+	pci_unregister_driver(&cs5520_pci_driver);
+}
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("low-level driver for Cyrix CS5510/5520");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, pata_cs5520);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(cs5520_init);
+module_exit(cs5520_exit);
+