--- /dev/null
+/*
+ * pata_opti.c - ATI PATA for new ATA layer
+ * (C) 2005 Red Hat Inc
+ *
+ * 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/blkdev.h>
+#include <linux/delay.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+
+#define DRV_NAME "pata_opti"
+#define DRV_VERSION "0.2.9"
+
+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
+ * @link: ATA link
+ * @deadline: deadline jiffies for the operation
+ *
+ * Set up cable type and use generic probe init
+ */
+
+static int opti_pre_reset(struct ata_link *link, unsigned long deadline)
+{
+ struct ata_port *ap = link->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]))
+ return -ENOENT;
+
+ return ata_sff_prereset(link, deadline);
+}
+
+/**
+ * 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)
+{
+ void __iomem *regio = ap->ioaddr.cmd_addr;
+
+ /* These 3 unlock the control register access */
+ ioread16(regio + 1);
+ ioread16(regio + 1);
+ iowrite8(3, regio + 2);
+
+ /* Do the I/O */
+ iowrite8(val, regio + reg);
+
+ /* Relock */
+ iowrite8(0x83, regio + 2);
+}
+
+/**
+ * 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;
+ void __iomem *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 }
+ };
+
+ iowrite8(0xff, regio + 5);
+ clock = ioread16(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 = {
+ ATA_PIO_SHT(DRV_NAME),
+};
+
+static struct ata_port_operations opti_port_ops = {
+ .inherits = &ata_sff_port_ops,
+ .cable_detect = ata_cable_40wire,
+ .set_piomode = opti_set_piomode,
+ .prereset = opti_pre_reset,
+};
+
+static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+ static const struct ata_port_info info = {
+ .flags = ATA_FLAG_SLAVE_POSS,
+ .pio_mask = ATA_PIO4,
+ .port_ops = &opti_port_ops
+ };
+ const struct ata_port_info *ppi[] = { &info, NULL };
+
+ ata_print_version_once(&dev->dev, DRV_VERSION);
+
+ return ata_pci_sff_init_one(dev, ppi, &opti_sht, NULL, 0);
+}
+
+static const struct pci_device_id opti[] = {
+ { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 },
+ { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 },
+
+ { },
+};
+
+static struct pci_driver opti_pci_driver = {
+ .name = DRV_NAME,
+ .id_table = opti,
+ .probe = opti_init_one,
+ .remove = ata_pci_remove_one,
+#ifdef CONFIG_PM_SLEEP
+ .suspend = ata_pci_device_suspend,
+ .resume = ata_pci_device_resume,
+#endif
+};
+
+module_pci_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);
Code Review / kvmfornfv.git / blobdiff