--- /dev/null
+/*
+ * 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;
+}
+
+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 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 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");
projects / linux-2.6-omap-h63xx.git / commitdiff