personal-pci.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:1k
- /*
- * linux/arch/arm/mach-footbridge/personal-pci.c
- *
- * PCI bios-type initialisation for PCI machines
- *
- * Bits taken from various places.
- */
- #include <linux/kernel.h>
- #include <linux/pci.h>
- #include <linux/init.h>
- #include <asm/irq.h>
- #include <asm/mach/pci.h>
- #include <asm/hardware/dec21285.h>
- static int irqmap_personal_server[] __initdata = {
- IRQ_IN0, IRQ_IN1, IRQ_IN2, IRQ_IN3, 0, 0, 0,
- IRQ_DOORBELLHOST, IRQ_DMA1, IRQ_DMA2, IRQ_PCI
- };
- static int __init personal_server_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
- {
- unsigned char line;
- pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &line);
- if (line > 0x40 && line <= 0x5f) {
- /* line corresponds to the bit controlling this interrupt
- * in the footbridge. Ignore the first 8 interrupt bits,
- * look up the rest in the map. IN0 is bit number 8
- */
- return irqmap_personal_server[(line & 0x1f) - 8];
- } else if (line == 0) {
- /* no interrupt */
- return 0;
- } else
- return irqmap_personal_server[(line - 1) & 3];
- }
- struct hw_pci personal_server_pci __initdata = {
- setup_resources: dc21285_setup_resources,
- init: dc21285_init,
- mem_offset: DC21285_PCI_MEM,
- swizzle: no_swizzle,
- map_irq: personal_server_map_irq,
- };