1 files changed, 309 insertions, 0 deletions

diff --git a/drivers/ide/pci/tc86c001.c b/drivers/ide/pci/tc86c001.c
new file mode 100644
index 000000000000..2ad72bbda342
--- /dev/null
+++ b/drivers/ide/pci/tc86c001.c
@@ -0,0 +1,309 @@
+/*
+ * drivers/ide/pci/tc86c001.c   Version 1.00    Dec 12, 2006
+ *
+ * Copyright (C) 2002 Toshiba Corporation
+ * Copyright (C) 2005-2006 MontaVista Software, Inc. <source@mvista.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/ide.h>
+
+static inline u8 tc86c001_ratemask(ide_drive_t *drive)
+{
+        return eighty_ninty_three(drive) ? 2 : 1;
+}
+
+static int tc86c001_tune_chipset(ide_drive_t *drive, u8 speed)
+{
+        ide_hwif_t *hwif        = HWIF(drive);
+        unsigned long scr_port  = hwif->config_data + (drive->dn ? 0x02 : 0x00);
+        u16 mode, scr           = hwif->INW(scr_port);
+
+        speed = ide_rate_filter(tc86c001_ratemask(drive), speed);
+
+        switch (speed) {
+                case XFER_UDMA_4:       mode = 0x00c0; break;
+                case XFER_UDMA_3:       mode = 0x00b0; break;
+                case XFER_UDMA_2:       mode = 0x00a0; break;
+                case XFER_UDMA_1:       mode = 0x0090; break;
+                case XFER_UDMA_0:       mode = 0x0080; break;
+                case XFER_MW_DMA_2:     mode = 0x0070; break;
+                case XFER_MW_DMA_1:     mode = 0x0060; break;
+                case XFER_MW_DMA_0:     mode = 0x0050; break;
+                case XFER_PIO_4:        mode = 0x0400; break;
+                case XFER_PIO_3:        mode = 0x0300; break;
+                case XFER_PIO_2:        mode = 0x0200; break;
+                case XFER_PIO_1:        mode = 0x0100; break;
+                case XFER_PIO_0:
+                default:                mode = 0x0000; break;
+        }
+
+        scr &= (speed < XFER_MW_DMA_0) ? 0xf8ff : 0xff0f;
+        scr |= mode;
+        hwif->OUTW(scr, scr_port);
+
+        return ide_config_drive_speed(drive, speed);
+}
+
+static void tc86c001_tune_drive(ide_drive_t *drive, u8 pio)
+{
+        pio =  ide_get_best_pio_mode(drive, pio, 4, NULL);
+        (void) tc86c001_tune_chipset(drive, XFER_PIO_0 + pio);
+}
+
+/*
+ * HACKITY HACK
+ *
+ * This is a workaround for the limitation 5 of the TC86C001 IDE controller:
+ * if a DMA transfer terminates prematurely, the controller leaves the device's
+ * interrupt request (INTRQ) pending and does not generate a PCI interrupt (or
+ * set the interrupt bit in the DMA status register), thus no PCI interrupt
+ * will occur until a DMA transfer has been successfully completed.
+ *
+ * We work around this by initiating dummy, zero-length DMA transfer on
+ * a DMA timeout expiration. I found no better way to do this with the current
+ * IDE core than to temporarily replace a higher level driver's timer expiry
+ * handler with our own backing up to that handler in case our recovery fails.
+ */
+static int tc86c001_timer_expiry(ide_drive_t *drive)
+{
+        ide_hwif_t *hwif        = HWIF(drive);
+        ide_expiry_t *expiry    = ide_get_hwifdata(hwif);
+        ide_hwgroup_t *hwgroup  = HWGROUP(drive);
+        u8 dma_stat             = hwif->INB(hwif->dma_status);
+
+        /* Restore a higher level driver's expiry handler first. */
+        hwgroup->expiry = expiry;
+
+        if ((dma_stat & 5) == 1) {      /* DMA active and no interrupt */
+                unsigned long sc_base   = hwif->config_data;
+                unsigned long twcr_port = sc_base + (drive->dn ? 0x06 : 0x04);
+                u8 dma_cmd              = hwif->INB(hwif->dma_command);
+
+                printk(KERN_WARNING "%s: DMA interrupt possibly stuck, "
+                       "attempting recovery...\n", drive->name);
+
+                /* Stop DMA */
+                hwif->OUTB(dma_cmd & ~0x01, hwif->dma_command);
+
+                /* Setup the dummy DMA transfer */
+                hwif->OUTW(0, sc_base + 0x0a);  /* Sector Count */
+                hwif->OUTW(0, twcr_port);       /* Transfer Word Count 1 or 2 */
+
+                /* Start the dummy DMA transfer */
+                hwif->OUTB(0x00, hwif->dma_command); /* clear R_OR_WCTR for write */
+                hwif->OUTB(0x01, hwif->dma_command); /* set START_STOPBM */
+
+                /*
+                 * If an interrupt was pending, it should come thru shortly.
+                 * If not, a higher level driver's expiry handler should
+                 * eventually cause some kind of recovery from the DMA stall.
+                 */
+                return WAIT_MIN_SLEEP;
+        }
+
+        /* Chain to the restored expiry handler if DMA wasn't active. */
+        if (likely(expiry != NULL))
+                return expiry(drive);
+
+        /* If there was no handler, "emulate" that for ide_timer_expiry()... */
+        return -1;
+}
+
+static void tc86c001_dma_start(ide_drive_t *drive)
+{
+        ide_hwif_t *hwif        = HWIF(drive);
+        ide_hwgroup_t *hwgroup  = HWGROUP(drive);
+        unsigned long sc_base   = hwif->config_data;
+        unsigned long twcr_port = sc_base + (drive->dn ? 0x06 : 0x04);
+        unsigned long nsectors  = hwgroup->rq->nr_sectors;
+
+        /*
+         * We have to manually load the sector count and size into
+         * the appropriate system control registers for DMA to work
+         * with LBA48 and ATAPI devices...
+         */
+        hwif->OUTW(nsectors, sc_base + 0x0a);   /* Sector Count */
+        hwif->OUTW(SECTOR_SIZE / 2, twcr_port); /* Transfer Word Count 1/2 */
+
+        /* Install our timeout expiry hook, saving the current handler... */
+        ide_set_hwifdata(hwif, hwgroup->expiry);
+        hwgroup->expiry = &tc86c001_timer_expiry;
+
+        ide_dma_start(drive);
+}
+
+static int tc86c001_busproc(ide_drive_t *drive, int state)
+{
+        ide_hwif_t *hwif        = HWIF(drive);
+        unsigned long sc_base   = hwif->config_data;
+        u16 scr1;
+
+        /* System Control 1 Register bit 11 (ATA Hard Reset) read */
+        scr1 = hwif->INW(sc_base + 0x00);
+
+        switch (state) {
+                case BUSSTATE_ON:
+                        if (!(scr1 & 0x0800))
+                                return 0;
+                        scr1 &= ~0x0800;
+
+                        hwif->drives[0].failures = hwif->drives[1].failures = 0;
+                        break;
+                case BUSSTATE_OFF:
+                        if (scr1 & 0x0800)
+                                return 0;
+                        scr1 |= 0x0800;
+
+                        hwif->drives[0].failures = hwif->drives[0].max_failures + 1;
+                        hwif->drives[1].failures = hwif->drives[1].max_failures + 1;
+                        break;
+                default:
+                        return -EINVAL;
+        }
+
+        /* System Control 1 Register bit 11 (ATA Hard Reset) write */
+        hwif->OUTW(scr1, sc_base + 0x00);
+        return 0;
+}
+
+static int config_chipset_for_dma(ide_drive_t *drive)
+{
+        u8 speed = ide_dma_speed(drive, tc86c001_ratemask(drive));
+
+        if (!speed)
+                return 0;
+
+        (void) tc86c001_tune_chipset(drive, speed);
+        return ide_dma_enable(drive);
+}
+
+static int tc86c001_config_drive_xfer_rate(ide_drive_t *drive)
+{
+        ide_hwif_t *hwif        = HWIF(drive);
+        struct hd_driveid *id   = drive->id;
+
+        if ((id->capability & 1) && drive->autodma) {
+
+                if (ide_use_dma(drive) && config_chipset_for_dma(drive))
+                        return hwif->ide_dma_on(drive);
+
+                goto fast_ata_pio;
+
+        } else if ((id->capability & 8) || (id->field_valid & 2)) {
+fast_ata_pio:
+                tc86c001_tune_drive(drive, 255);
+                return hwif->ide_dma_off_quietly(drive);
+        }
+        /* IORDY not supported */
+        return 0;
+}
+
+static void __devinit init_hwif_tc86c001(ide_hwif_t *hwif)
+{
+        unsigned long sc_base   = pci_resource_start(hwif->pci_dev, 5);
+        u16 scr1                = hwif->INW(sc_base + 0x00);;
+
+        /* System Control 1 Register bit 15 (Soft Reset) set */
+        hwif->OUTW(scr1 |  0x8000, sc_base + 0x00);
+
+        /* System Control 1 Register bit 14 (FIFO Reset) set */
+        hwif->OUTW(scr1 |  0x4000, sc_base + 0x00);
+
+        /* System Control 1 Register: reset clear */
+        hwif->OUTW(scr1 & ~0xc000, sc_base + 0x00);
+
+        /* Store the system control register base for convenience... */
+        hwif->config_data = sc_base;
+
+        hwif->tuneproc  = &tc86c001_tune_drive;
+        hwif->speedproc = &tc86c001_tune_chipset;
+        hwif->busproc   = &tc86c001_busproc;
+
+        hwif->drives[0].autotune = hwif->drives[1].autotune = 1;
+
+        if (!hwif->dma_base)
+                return;
+
+        /*
+         * Sector Count Control Register bits 0 and 1 set:
+         * software sets Sector Count Register for master and slave device
+         */
+        hwif->OUTW(0x0003, sc_base + 0x0c);
+
+        /* Sector Count Register limit */
+        hwif->rqsize     = 0xffff;
+
+        hwif->atapi_dma  = 1;
+        hwif->ultra_mask = 0x1f;
+        hwif->mwdma_mask = 0x07;
+
+        hwif->ide_dma_check     = &tc86c001_config_drive_xfer_rate;
+        hwif->dma_start         = &tc86c001_dma_start;
+
+        if (!hwif->udma_four) {
+                /*
+                 * System Control  1 Register bit 13 (PDIAGN):
+                 * 0=80-pin cable, 1=40-pin cable
+                 */
+                scr1 = hwif->INW(sc_base + 0x00);
+                hwif->udma_four = (scr1 & 0x2000) ? 0 : 1;
+        }
+
+        if (!noautodma)
+                hwif->autodma = 1;
+        hwif->drives[0].autodma = hwif->drives[1].autodma = hwif->autodma;
+}
+
+static unsigned int __devinit init_chipset_tc86c001(struct pci_dev *dev,
+                                                        const char *name)
+{
+        int err = pci_request_region(dev, 5, name);
+
+        if (err)
+                printk(KERN_ERR "%s: system control regs already in use", name);
+        return err;
+}
+
+static ide_pci_device_t tc86c001_chipset __devinitdata = {
+        .name           = "TC86C001",
+        .init_chipset   = init_chipset_tc86c001,
+        .init_hwif      = init_hwif_tc86c001,
+        .channels       = 1,
+        .autodma        = AUTODMA,
+        .bootable       = OFF_BOARD
+};
+
+static int __devinit tc86c001_init_one(struct pci_dev *dev,
+                                       const struct pci_device_id *id)
+{
+        return ide_setup_pci_device(dev, &tc86c001_chipset);
+}
+
+static struct pci_device_id tc86c001_pci_tbl[] = {
+        { PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_TC86C001_IDE,
+          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+        { 0, }
+};
+MODULE_DEVICE_TABLE(pci, tc86c001_pci_tbl);
+
+static struct pci_driver driver = {
+        .name           = "TC86C001",
+        .id_table       = tc86c001_pci_tbl,
+        .probe          = tc86c001_init_one
+};
+
+static int __init tc86c001_ide_init(void)
+{
+        return ide_pci_register_driver(&driver);
+}
+module_init(tc86c001_ide_init);
+
+MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>");
+MODULE_DESCRIPTION("PCI driver module for TC86C001 IDE");
+MODULE_LICENSE("GPL");