1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * linux/arch/arm/mach-footbridge/personal-pci.c
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * PCI bios-type initialisation for PCI machines
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Bits taken from various places.
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun #include <linux/kernel.h>
10*4882a593Smuzhiyun #include <linux/pci.h>
11*4882a593Smuzhiyun #include <linux/init.h>
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #include <asm/irq.h>
14*4882a593Smuzhiyun #include <asm/mach/pci.h>
15*4882a593Smuzhiyun #include <asm/mach-types.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun static int irqmap_personal_server[] = {
18*4882a593Smuzhiyun IRQ_IN0, IRQ_IN1, IRQ_IN2, IRQ_IN3, 0, 0, 0,
19*4882a593Smuzhiyun IRQ_DOORBELLHOST, IRQ_DMA1, IRQ_DMA2, IRQ_PCI
20*4882a593Smuzhiyun };
21*4882a593Smuzhiyun
personal_server_map_irq(const struct pci_dev * dev,u8 slot,u8 pin)22*4882a593Smuzhiyun static int personal_server_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
23*4882a593Smuzhiyun {
24*4882a593Smuzhiyun unsigned char line;
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &line);
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun if (line > 0x40 && line <= 0x5f) {
29*4882a593Smuzhiyun /* line corresponds to the bit controlling this interrupt
30*4882a593Smuzhiyun * in the footbridge. Ignore the first 8 interrupt bits,
31*4882a593Smuzhiyun * look up the rest in the map. IN0 is bit number 8
32*4882a593Smuzhiyun */
33*4882a593Smuzhiyun return irqmap_personal_server[(line & 0x1f) - 8];
34*4882a593Smuzhiyun } else if (line == 0) {
35*4882a593Smuzhiyun /* no interrupt */
36*4882a593Smuzhiyun return 0;
37*4882a593Smuzhiyun } else
38*4882a593Smuzhiyun return irqmap_personal_server[(line - 1) & 3];
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun static struct hw_pci personal_server_pci __initdata = {
42*4882a593Smuzhiyun .map_irq = personal_server_map_irq,
43*4882a593Smuzhiyun .nr_controllers = 1,
44*4882a593Smuzhiyun .ops = &dc21285_ops,
45*4882a593Smuzhiyun .setup = dc21285_setup,
46*4882a593Smuzhiyun .preinit = dc21285_preinit,
47*4882a593Smuzhiyun .postinit = dc21285_postinit,
48*4882a593Smuzhiyun };
49*4882a593Smuzhiyun
personal_pci_init(void)50*4882a593Smuzhiyun static int __init personal_pci_init(void)
51*4882a593Smuzhiyun {
52*4882a593Smuzhiyun if (machine_is_personal_server())
53*4882a593Smuzhiyun pci_common_init(&personal_server_pci);
54*4882a593Smuzhiyun return 0;
55*4882a593Smuzhiyun }
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun subsys_initcall(personal_pci_init);
58