[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>
diff --git a/drivers/ata/pata_opti.c b/drivers/ata/pata_opti.c
new file mode 100644
index 0000000..c3d0132
--- /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);