patch-2.4.21 linux-2.4.21/drivers/ide/pci/ns87415.c
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- Lines: 268
- Date:
2003-06-13 07:51:33.000000000 -0700
- Orig file:
linux-2.4.20/drivers/ide/pci/ns87415.c
- Orig date:
1969-12-31 16:00:00.000000000 -0800
diff -urN linux-2.4.20/drivers/ide/pci/ns87415.c linux-2.4.21/drivers/ide/pci/ns87415.c
@@ -0,0 +1,267 @@
+/*
+ * 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;
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