--- /dev/null
+/*
+ * pata_optidma.c - Opti DMA PATA for new ATA layer
+ * (C) 2006 Red Hat Inc
+ * Alan Cox <alan@redhat.com>
+ *
+ * The Opti DMA controllers are related to the older PIO PCI controllers
+ * and indeed the VLB ones. The main differences are that the timing
+ * numbers are now based off PCI clocks not VLB and differ, and that
+ * MWDMA is supported.
+ *
+ * This driver should support Viper-N+, FireStar, FireStar Plus.
+ *
+ * These devices support virtual DMA for read (aka the CS5520). Later
+ * chips support UDMA33, but only if the rest of the board logic does,
+ * so you have to get this right. We don't support the virtual DMA
+ * but we do handle UDMA.
+ *
+ * Bits that are worth knowing
+ * Most control registers are shadowed into I/O registers
+ * 0x1F5 bit 0 tells you if the PCI/VLB clock is 33 or 25Mhz
+ * Virtual DMA registers *move* between rev 0x02 and rev 0x10
+ * UDMA requires a 66MHz FSB
+ *
+ */
+
+#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_optidma"
+#define DRV_VERSION "0.2.3"
+
+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 */
+};
+
+static int pci_clock; /* 0 = 33 1 = 25 */
+
+/**
+ * optidma_pre_reset - probe begin
+ * @ap: ATA port
+ *
+ * Set up cable type and use generic probe init
+ */
+
+static int optidma_pre_reset(struct ata_port *ap)
+{
+ struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+ static const struct pci_bits optidma_enable_bits = {
+ 0x40, 1, 0x08, 0x00
+ };
+
+ if (ap->port_no && !pci_test_config_bits(pdev, &optidma_enable_bits))
+ return -ENOENT;
+
+ ap->cbl = ATA_CBL_PATA40;
+ return ata_std_prereset(ap);
+}
+
+/**
+ * optidma_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 optidma_error_handler(struct ata_port *ap)
+{
+ ata_bmdma_drive_eh(ap, optidma_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
+}
+
+/**
+ * optidma_unlock - unlock control registers
+ * @ap: ATA port
+ *
+ * Unlock the control register block for this adapter. Registers must not
+ * be unlocked in a situation where libata might look at them.
+ */
+
+static void optidma_unlock(struct ata_port *ap)
+{
+ unsigned long regio = ap->ioaddr.cmd_addr;
+
+ /* These 3 unlock the control register access */
+ inw(regio + 1);
+ inw(regio + 1);
+ outb(3, regio + 2);
+}
+
+/**
+ * optidma_lock - issue temporary relock
+ * @ap: ATA port
+ *
+ * Re-lock the configuration register settings.
+ */
+
+static void optidma_lock(struct ata_port *ap)
+{
+ unsigned long regio = ap->ioaddr.cmd_addr;
+
+ /* Relock */
+ outb(0x83, regio + 2);
+}
+
+/**
+ * optidma_set_mode - set mode data
+ * @ap: ATA interface
+ * @adev: ATA device
+ * @mode: Mode to set
+ *
+ * Called to do the DMA or PIO mode setup. Timing numbers are all
+ * pre computed to keep the code clean. There are two tables depending
+ * on the hardware clock speed.
+ *
+ * WARNING: While we do this the IDE registers vanish. If we take an
+ * IRQ here we depend on the host set locking to avoid catastrophe.
+ */
+
+static void optidma_set_mode(struct ata_port *ap, struct ata_device *adev, u8 mode)
+{
+ struct ata_device *pair = ata_dev_pair(adev);
+ int pio = adev->pio_mode - XFER_PIO_0;
+ int dma = adev->dma_mode - XFER_MW_DMA_0;
+ unsigned long regio = ap->ioaddr.cmd_addr;
+ u8 addr;
+
+ /* Address table precomputed with 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] = {
+ { 0x59, 0x46, 0x30, 0x20, 0x20 },
+ { 0x46, 0x32, 0x20, 0x20, 0x10 }
+ };
+ static const u8 dma_data_rec_timing[2][3] = {
+ { 0x76, 0x20, 0x20 },
+ { 0x54, 0x20, 0x10 }
+ };
+
+ /* Switch from IDE to control mode */
+ optidma_unlock(ap);
+
+
+ /*
+ * As with many controllers the address setup time is shared
+ * and must suit both devices if present. FIXME: Check if we
+ * need to look at slowest of PIO/DMA mode of either device
+ */
+
+ if (mode >= XFER_MW_DMA_0)
+ addr = 0;
+ else
+ addr = addr_timing[pci_clock][pio];
+
+ if (pair) {
+ u8 pair_addr;
+ /* Hardware constraint */
+ if (pair->dma_mode)
+ pair_addr = 0;
+ else
+ pair_addr = addr_timing[pci_clock][pair->pio_mode - XFER_PIO_0];
+ if (pair_addr > addr)
+ addr = pair_addr;
+ }
+
+ /* Commence primary programming sequence */
+ /* First we load the device number into the timing select */
+ outb(adev->devno, regio + MISC_REG);
+ /* Now we load the data timings into read data/write data */
+ if (mode < XFER_MW_DMA_0) {
+ outb(data_rec_timing[pci_clock][pio], regio + READ_REG);
+ outb(data_rec_timing[pci_clock][pio], regio + WRITE_REG);
+ } else if (mode < XFER_UDMA_0) {
+ outb(dma_data_rec_timing[pci_clock][dma], regio + READ_REG);
+ outb(dma_data_rec_timing[pci_clock][dma], regio + WRITE_REG);
+ }
+ /* Finally we load the address setup into the misc register */
+ outb(addr | adev->devno, regio + MISC_REG);
+
+ /* Programming sequence complete, timing 0 dev 0, timing 1 dev 1 */
+ outb(0x85, regio + CNTRL_REG);
+
+ /* Switch back to IDE mode */
+ optidma_lock(ap);
+
+ /* Note: at this point our programming is incomplete. We are
+ not supposed to program PCI 0x43 "things we hacked onto the chip"
+ until we've done both sets of PIO/DMA timings */
+}
+
+/**
+ * optiplus_set_mode - DMA setup for Firestar Plus
+ * @ap: ATA port
+ * @adev: device
+ * @mode: desired mode
+ *
+ * The Firestar plus has additional UDMA functionality for UDMA0-2 and
+ * requires we do some additional work. Because the base work we must do
+ * is mostly shared we wrap the Firestar setup functionality in this
+ * one
+ */
+
+static void optiplus_set_mode(struct ata_port *ap, struct ata_device *adev, u8 mode)
+{
+ struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+ u8 udcfg;
+ u8 udslave;
+ int dev2 = 2 * adev->devno;
+ int unit = 2 * ap->port_no + adev->devno;
+ int udma = mode - XFER_UDMA_0;
+
+ pci_read_config_byte(pdev, 0x44, &udcfg);
+ if (mode <= XFER_UDMA_0) {
+ udcfg &= ~(1 << unit);
+ optidma_set_mode(ap, adev, adev->dma_mode);
+ } else {
+ udcfg |= (1 << unit);
+ if (ap->port_no) {
+ pci_read_config_byte(pdev, 0x45, &udslave);
+ udslave &= ~(0x03 << dev2);
+ udslave |= (udma << dev2);
+ pci_write_config_byte(pdev, 0x45, udslave);
+ } else {
+ udcfg &= ~(0x30 << dev2);
+ udcfg |= (udma << dev2);
+ }
+ }
+ pci_write_config_byte(pdev, 0x44, udcfg);
+}
+
+/**
+ * optidma_set_pio_mode - PIO setup callback
+ * @ap: ATA port
+ * @adev: Device
+ *
+ * The libata core provides separate functions for handling PIO and
+ * DMA programming. The architecture of the Firestar makes it easier
+ * for us to have a common function so we provide wrappers
+ */
+
+static void optidma_set_pio_mode(struct ata_port *ap, struct ata_device *adev)
+{
+ optidma_set_mode(ap, adev, adev->pio_mode);
+}
+
+/**
+ * optidma_set_dma_mode - DMA setup callback
+ * @ap: ATA port
+ * @adev: Device
+ *
+ * The libata core provides separate functions for handling PIO and
+ * DMA programming. The architecture of the Firestar makes it easier
+ * for us to have a common function so we provide wrappers
+ */
+
+static void optidma_set_dma_mode(struct ata_port *ap, struct ata_device *adev)
+{
+ optidma_set_mode(ap, adev, adev->dma_mode);
+}
+
+/**
+ * optiplus_set_pio_mode - PIO setup callback
+ * @ap: ATA port
+ * @adev: Device
+ *
+ * The libata core provides separate functions for handling PIO and
+ * DMA programming. The architecture of the Firestar makes it easier
+ * for us to have a common function so we provide wrappers
+ */
+
+static void optiplus_set_pio_mode(struct ata_port *ap, struct ata_device *adev)
+{
+ optiplus_set_mode(ap, adev, adev->pio_mode);
+}
+
+/**
+ * optiplus_set_dma_mode - DMA setup callback
+ * @ap: ATA port
+ * @adev: Device
+ *
+ * The libata core provides separate functions for handling PIO and
+ * DMA programming. The architecture of the Firestar makes it easier
+ * for us to have a common function so we provide wrappers
+ */
+
+static void optiplus_set_dma_mode(struct ata_port *ap, struct ata_device *adev)
+{
+ optiplus_set_mode(ap, adev, adev->dma_mode);
+}
+
+/**
+ * optidma_make_bits - PCI setup helper
+ * @adev: ATA device
+ *
+ * Turn the ATA device setup into PCI configuration bits
+ * for register 0x43 and return the two bits needed.
+ */
+
+static u8 optidma_make_bits43(struct ata_device *adev)
+{
+ static const u8 bits43[5] = {
+ 0, 0, 0, 1, 2
+ };
+ if (!ata_dev_enabled(adev))
+ return 0;
+ if (adev->dma_mode)
+ return adev->dma_mode - XFER_MW_DMA_0;
+ return bits43[adev->pio_mode - XFER_PIO_0];
+}
+
+/**
+ * optidma_post_set_mode - finalize PCI setup
+ * @ap: port to set up
+ *
+ * Finalise the configuration by writing the nibble of extra bits
+ * of data into the chip.
+ */
+
+static void optidma_post_set_mode(struct ata_port *ap)
+{
+ u8 r;
+ int nybble = 4 * ap->port_no;
+ struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+
+ pci_read_config_byte(pdev, 0x43, &r);
+
+ r &= (0x0F << nybble);
+ r |= (optidma_make_bits43(&ap->device[0]) +
+ (optidma_make_bits43(&ap->device[0]) << 2)) << nybble;
+
+ pci_write_config_byte(pdev, 0x43, r);
+}
+
+static struct scsi_host_template optidma_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,
+ .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,
+ .slave_destroy = ata_scsi_slave_destroy,
+ .bios_param = ata_std_bios_param,
+#ifdef CONFIG_PM
+ .resume = ata_scsi_device_resume,
+ .suspend = ata_scsi_device_suspend,
+#endif
+};
+
+static struct ata_port_operations optidma_port_ops = {
+ .port_disable = ata_port_disable,
+ .set_piomode = optidma_set_pio_mode,
+ .set_dmamode = optidma_set_dma_mode,
+
+ .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,
+ .post_internal_cmd = ata_bmdma_post_internal_cmd,
+ .error_handler = optidma_error_handler,
+ .post_set_mode = optidma_post_set_mode,
+
+ .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,
+
+ .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 struct ata_port_operations optiplus_port_ops = {
+ .port_disable = ata_port_disable,
+ .set_piomode = optiplus_set_pio_mode,
+ .set_dmamode = optiplus_set_dma_mode,
+
+ .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,
+ .post_internal_cmd = ata_bmdma_post_internal_cmd,
+ .error_handler = optidma_error_handler,
+ .post_set_mode = optidma_post_set_mode,
+
+ .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,
+
+ .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
+};
+
+/**
+ * optiplus_with_udma - Look for UDMA capable setup
+ * @pdev; ATA controller
+ */
+
+static int optiplus_with_udma(struct pci_dev *pdev)
+{
+ u8 r;
+ int ret = 0;
+ int ioport = 0x22;
+ struct pci_dev *dev1;
+
+ /* Find function 1 */
+ dev1 = pci_get_device(0x1045, 0xC701, NULL);
+ if(dev1 == NULL)
+ return 0;
+
+ /* Rev must be >= 0x10 */
+ pci_read_config_byte(dev1, 0x08, &r);
+ if (r < 0x10)
+ goto done_nomsg;
+ /* Read the chipset system configuration to check our mode */
+ pci_read_config_byte(dev1, 0x5F, &r);
+ ioport |= (r << 8);
+ outb(0x10, ioport);
+ /* Must be 66Mhz sync */
+ if ((inb(ioport + 2) & 1) == 0)
+ goto done;
+
+ /* Check the ATA arbitration/timing is suitable */
+ pci_read_config_byte(pdev, 0x42, &r);
+ if ((r & 0x36) != 0x36)
+ goto done;
+ pci_read_config_byte(dev1, 0x52, &r);
+ if (r & 0x80) /* IDEDIR disabled */
+ ret = 1;
+done:
+ printk(KERN_WARNING "UDMA not supported in this configuration.\n");
+done_nomsg: /* Wrong chip revision */
+ pci_dev_put(dev1);
+ return ret;
+}
+
+static int optidma_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+ static struct ata_port_info info_82c700 = {
+ .sht = &optidma_sht,
+ .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
+ .pio_mask = 0x1f,
+ .mwdma_mask = 0x07,
+ .port_ops = &optidma_port_ops
+ };
+ static struct ata_port_info info_82c700_udma = {
+ .sht = &optidma_sht,
+ .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
+ .pio_mask = 0x1f,
+ .mwdma_mask = 0x07,
+ .udma_mask = 0x07,
+ .port_ops = &optiplus_port_ops
+ };
+ static struct ata_port_info *port_info[2];
+ struct ata_port_info *info = &info_82c700;
+ static int printed_version;
+
+ if (!printed_version++)
+ dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");
+
+ /* Fixed location chipset magic */
+ inw(0x1F1);
+ inw(0x1F1);
+ pci_clock = inb(0x1F5) & 1; /* 0 = 33Mhz, 1 = 25Mhz */
+
+ if (optiplus_with_udma(dev))
+ info = &info_82c700_udma;
+
+ port_info[0] = port_info[1] = info;
+ return ata_pci_init_one(dev, port_info, 2);
+}
+
+static const struct pci_device_id optidma[] = {
+ { PCI_VDEVICE(OPTI, 0xD568), }, /* Opti 82C700 */
+
+ { },
+};
+
+static struct pci_driver optidma_pci_driver = {
+ .name = DRV_NAME,
+ .id_table = optidma,
+ .probe = optidma_init_one,
+ .remove = ata_pci_remove_one,
+#ifdef CONFIG_PM
+ .suspend = ata_pci_device_suspend,
+ .resume = ata_pci_device_resume,
+#endif
+};
+
+static int __init optidma_init(void)
+{
+ return pci_register_driver(&optidma_pci_driver);
+}
+
+static void __exit optidma_exit(void)
+{
+ pci_unregister_driver(&optidma_pci_driver);
+}
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("low-level driver for Opti Firestar/Firestar Plus");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, optidma);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(optidma_init);
+module_exit(optidma_exit);
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