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
personal_server_map_irq(const struct pci_dev * dev,u8 slot,u8 pin)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
personal_pci_init(void)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
