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Linux/arch/arm/mach-footbridge/personal-pci.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * linux/arch/arm/mach-footbridge/personal-pci.c
  4  *
  5  * PCI bios-type initialisation for PCI machines
  6  *
  7  * Bits taken from various places.
  8  */
  9 #include <linux/kernel.h>
 10 #include <linux/pci.h>
 11 #include <linux/init.h>
 12 
 13 #include <asm/irq.h>
 14 #include <asm/mach/pci.h>
 15 #include <asm/mach-types.h>
 16 
 17 static int irqmap_personal_server[] __initdata = {
 18         IRQ_IN0, IRQ_IN1, IRQ_IN2, IRQ_IN3, 0, 0, 0,
 19         IRQ_DOORBELLHOST, IRQ_DMA1, IRQ_DMA2, IRQ_PCI
 20 };
 21 
 22 static int __init personal_server_map_irq(const struct pci_dev *dev, u8 slot,
 23         u8 pin)
 24 {
 25         unsigned char line;
 26 
 27         pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &line);
 28 
 29         if (line > 0x40 && line <= 0x5f) {
 30                 /* line corresponds to the bit controlling this interrupt
 31                  * in the footbridge.  Ignore the first 8 interrupt bits,
 32                  * look up the rest in the map.  IN0 is bit number 8
 33                  */
 34                 return irqmap_personal_server[(line & 0x1f) - 8];
 35         } else if (line == 0) {
 36                 /* no interrupt */
 37                 return 0;
 38         } else
 39                 return irqmap_personal_server[(line - 1) & 3];
 40 }
 41 
 42 static struct hw_pci personal_server_pci __initdata = {
 43         .map_irq                = personal_server_map_irq,
 44         .nr_controllers         = 1,
 45         .ops                    = &dc21285_ops,
 46         .setup                  = dc21285_setup,
 47         .preinit                = dc21285_preinit,
 48         .postinit               = dc21285_postinit,
 49 };
 50 
 51 static int __init personal_pci_init(void)
 52 {
 53         if (machine_is_personal_server())
 54                 pci_common_init(&personal_server_pci);
 55         return 0;
 56 }
 57 
 58 subsys_initcall(personal_pci_init);
 59 

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