#include <linux/tty.h>
#include <linux/serial_core.h>
#include <linux/delay.h>
-#include <linux/ide.h>
#include <asm/io.h>
#include <asm/hardware.h>
#include <asm/irq.h>
#include <asm/superio.h>
-#define SUPERIO_IDE_MAX_RETRIES 25
-
static struct superio_device sio_dev;
results = inb(IC_PIC1+0);
+ /*
+ * Bit 7: 1 = active Interrupt; 0 = no Interrupt pending
+ * Bits 6-3: zero
+ * Bits 2-0: highest priority, active requesting interrupt ID (0-7)
+ */
if ((results & 0x80) == 0) {
-#ifndef CONFIG_SMP
- /* HACK: need to investigate why this happens if SMP enabled */
- BUG(); /* This shouldn't happen */
-#endif
+ /* I suspect "spurious" interrupts are from unmasking an IRQ.
+ * We don't know if an interrupt was/is pending and thus
+ * just call the handler for that IRQ as if it were pending.
+ */
return IRQ_HANDLED;
}
/* Check to see which device is interrupting */
-
local_irq = results & 0x0f;
if (local_irq == 2 || local_irq > 7) {
sio->irq_region->data.irqbase + local_irq,
regs);
- /* set EOI */
-
+ /* set EOI - forces a new interrupt if a lower priority device
+ * still needs service.
+ */
outb((OCW2_SEOI|local_irq),IC_PIC1 + 0);
return IRQ_HANDLED;
}
}
-static u8 superio_ide_inb (unsigned long port);
-static unsigned long superio_ide_status[2];
-static unsigned long superio_ide_select[2];
-static unsigned long superio_ide_dma_status[2];
-
void superio_fixup_pci(struct pci_dev *pdev)
{
u8 prog;
pci_read_config_byte(pdev, PCI_CLASS_PROG, &prog);
printk("PCI: Enabled native mode for NS87415 (pif=0x%x)\n", prog);
}
-DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87415, superio_fixup_pci);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87415, superio_fixup_pci);
-/* Because of a defect in Super I/O, all reads of the PCI DMA status
- * registers, IDE status register and the IDE select register need to be
- * retried
- */
-static u8 superio_ide_inb (unsigned long port)
-{
- if (port == superio_ide_status[0] ||
- port == superio_ide_status[1] ||
- port == superio_ide_select[0] ||
- port == superio_ide_select[1] ||
- port == superio_ide_dma_status[0] ||
- port == superio_ide_dma_status[1]) {
- u8 tmp;
- int retries = SUPERIO_IDE_MAX_RETRIES;
-
- /* printk(" [ reading port 0x%x with retry ] ", port); */
-
- do {
- tmp = inb(port);
- if (tmp == 0)
- udelay(50);
- } while (tmp == 0 && retries-- > 0);
-
- return tmp;
- }
-
- return inb(port);
-}
-
-void __init superio_ide_init_iops (struct hwif_s *hwif)
-{
- u32 base, dmabase;
- u8 tmp;
- struct pci_dev *pdev = hwif->pci_dev;
- u8 port = hwif->channel;
-
- base = pci_resource_start(pdev, port * 2) & ~3;
- dmabase = pci_resource_start(pdev, 4) & ~3;
-
- superio_ide_status[port] = base + IDE_STATUS_OFFSET;
- superio_ide_select[port] = base + IDE_SELECT_OFFSET;
- superio_ide_dma_status[port] = dmabase + (!port ? 2 : 0xa);
-
- /* Clear error/interrupt, enable dma */
- tmp = superio_ide_inb(superio_ide_dma_status[port]);
- outb(tmp | 0x66, superio_ide_dma_status[port]);
-
- /* We need to override inb to workaround a SuperIO errata */
- hwif->INB = superio_ide_inb;
-}
static int __devinit superio_probe(struct pci_dev *dev, const struct pci_device_id *id)
{