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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [ide/] [pci/] [ns87415.c] - Rev 1765
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/* * linux/drivers/ide/pci/ns87415.c Version 2.00 Sep. 10, 2002 * * Copyright (C) 1997-1998 Mark Lord <mlord@pobox.com> * Copyright (C) 1998 Eddie C. Dost <ecd@skynet.be> * Copyright (C) 1999-2000 Andre Hedrick <andre@linux-ide.org> * * Inspired by an earlier effort from David S. Miller <davem@redhat.com> */ #include <linux/config.h> #include <linux/module.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/timer.h> #include <linux/mm.h> #include <linux/ioport.h> #include <linux/interrupt.h> #include <linux/blkdev.h> #include <linux/hdreg.h> #include <linux/pci.h> #include <linux/delay.h> #include <linux/ide.h> #include <linux/init.h> #include <asm/io.h> #include "ns87415.h" static unsigned int ns87415_count = 0, ns87415_control[MAX_HWIFS] = { 0 }; /* * This routine either enables/disables (according to drive->present) * the IRQ associated with the port (HWIF(drive)), * and selects either PIO or DMA handshaking for the next I/O operation. */ static void ns87415_prepare_drive (ide_drive_t *drive, unsigned int use_dma) { ide_hwif_t *hwif = HWIF(drive); unsigned int bit, other, new, *old = (unsigned int *) hwif->select_data; struct pci_dev *dev = hwif->pci_dev; unsigned long flags; local_irq_save(flags); new = *old; /* Adjust IRQ enable bit */ bit = 1 << (8 + hwif->channel); new = drive->present ? (new & ~bit) : (new | bit); /* Select PIO or DMA, DMA may only be selected for one drive/channel. */ bit = 1 << (20 + drive->select.b.unit + (hwif->channel << 1)); other = 1 << (20 + (1 - drive->select.b.unit) + (hwif->channel << 1)); new = use_dma ? ((new & ~other) | bit) : (new & ~bit); if (new != *old) { unsigned char stat; /* * Don't change DMA engine settings while Write Buffers * are busy. */ (void) pci_read_config_byte(dev, 0x43, &stat); while (stat & 0x03) { udelay(1); (void) pci_read_config_byte(dev, 0x43, &stat); } *old = new; (void) pci_write_config_dword(dev, 0x40, new); /* * And let things settle... */ udelay(10); } local_irq_restore(flags); } static void ns87415_selectproc (ide_drive_t *drive) { ns87415_prepare_drive (drive, drive->using_dma); } static int ns87415_ide_dma_end (ide_drive_t *drive) { ide_hwif_t *hwif = HWIF(drive); u8 dma_stat = 0, dma_cmd = 0; drive->waiting_for_dma = 0; dma_stat = hwif->INB(hwif->dma_status); /* get dma command mode */ dma_cmd = hwif->INB(hwif->dma_command); /* stop DMA */ hwif->OUTB(dma_cmd & ~1, hwif->dma_command); /* from ERRATA: clear the INTR & ERROR bits */ dma_cmd = hwif->INB(hwif->dma_command); hwif->OUTB(dma_cmd|6, hwif->dma_command); /* and free any DMA resources */ ide_destroy_dmatable(drive); /* verify good DMA status */ return (dma_stat & 7) != 4; } static int ns87415_ide_dma_read (ide_drive_t *drive) { /* select DMA xfer */ ns87415_prepare_drive(drive, 1); if (!(__ide_dma_read(drive))) return 0; /* DMA failed: select PIO xfer */ ns87415_prepare_drive(drive, 0); return 1; } static int ns87415_ide_dma_write (ide_drive_t *drive) { /* select DMA xfer */ ns87415_prepare_drive(drive, 1); if (!(__ide_dma_write(drive))) return 0; /* DMA failed: select PIO xfer */ ns87415_prepare_drive(drive, 0); return 1; } static int ns87415_ide_dma_check (ide_drive_t *drive) { if (drive->media != ide_disk) return HWIF(drive)->ide_dma_off_quietly(drive); return __ide_dma_check(drive); } static void __init init_hwif_ns87415 (ide_hwif_t *hwif) { struct pci_dev *dev = hwif->pci_dev; unsigned int ctrl, using_inta; u8 progif; #ifdef __sparc_v9__ int timeout; u8 stat; #endif hwif->autodma = 0; hwif->selectproc = &ns87415_selectproc; /* Set a good latency timer and cache line size value. */ (void) pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64); #ifdef __sparc_v9__ (void) pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 0x10); #endif /* * We cannot probe for IRQ: both ports share common IRQ on INTA. * Also, leave IRQ masked during drive probing, to prevent infinite * interrupts from a potentially floating INTA.. * * IRQs get unmasked in selectproc when drive is first used. */ (void) pci_read_config_dword(dev, 0x40, &ctrl); (void) pci_read_config_byte(dev, 0x09, &progif); /* is irq in "native" mode? */ using_inta = progif & (1 << (hwif->channel << 1)); if (!using_inta) using_inta = ctrl & (1 << (4 + hwif->channel)); if (hwif->mate) { hwif->select_data = hwif->mate->select_data; } else { hwif->select_data = (unsigned long) &ns87415_control[ns87415_count++]; ctrl |= (1 << 8) | (1 << 9); /* mask both IRQs */ if (using_inta) ctrl &= ~(1 << 6); /* unmask INTA */ *((unsigned int *)hwif->select_data) = ctrl; (void) pci_write_config_dword(dev, 0x40, ctrl); /* * Set prefetch size to 512 bytes for both ports, * but don't turn on/off prefetching here. */ pci_write_config_byte(dev, 0x55, 0xee); #ifdef __sparc_v9__ /* * XXX: Reset the device, if we don't it will not respond * to SELECT_DRIVE() properly during first probe_hwif(). */ timeout = 10000; hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]); udelay(10); hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]); do { udelay(50); stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]); if (stat == 0xff) break; } while ((stat & BUSY_STAT) && --timeout); #endif } if (!using_inta) hwif->irq = hwif->channel ? 15 : 14; /* legacy mode */ else if (!hwif->irq && hwif->mate && hwif->mate->irq) hwif->irq = hwif->mate->irq; /* share IRQ with mate */ if (!hwif->dma_base) return; hwif->OUTB(0x60, hwif->dma_status); hwif->ide_dma_read = &ns87415_ide_dma_read; hwif->ide_dma_write = &ns87415_ide_dma_write; hwif->ide_dma_check = &ns87415_ide_dma_check; hwif->ide_dma_end = &ns87415_ide_dma_end; if (!noautodma) hwif->autodma = 1; hwif->drives[0].autodma = hwif->autodma; hwif->drives[1].autodma = hwif->autodma; } static void __init init_dma_ns87415 (ide_hwif_t *hwif, unsigned long dmabase) { ide_setup_dma(hwif, dmabase, 8); } extern void ide_setup_pci_device(struct pci_dev *, ide_pci_device_t *); static int __devinit ns87415_init_one(struct pci_dev *dev, const struct pci_device_id *id) { ide_pci_device_t *d = &ns87415_chipsets[id->driver_data]; if (dev->device != d->device) BUG(); ide_setup_pci_device(dev, d); MOD_INC_USE_COUNT; return 0; } static struct pci_device_id ns87415_pci_tbl[] __devinitdata = { { PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87415, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, { 0, }, }; static struct pci_driver driver = { .name = "NS87415IDE", .id_table = ns87415_pci_tbl, .probe = ns87415_init_one, }; static int ns87415_ide_init(void) { return ide_pci_register_driver(&driver); } static void ns87415_ide_exit(void) { ide_pci_unregister_driver(&driver); } module_init(ns87415_ide_init); module_exit(ns87415_ide_exit); MODULE_AUTHOR("Mark Lord, Eddie Dost, Andre Hedrick"); MODULE_DESCRIPTION("PCI driver module for NS87415 IDE"); MODULE_LICENSE("GPL"); EXPORT_NO_SYMBOLS;