1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Common PowerQUICC II code.
4  *
5  * Author: Scott Wood <scottwood@freescale.com>
6  * Copyright (c) 2007 Freescale Semiconductor
7  *
8  * Based on code by Vitaly Bordug <vbordug@ru.mvista.com>
9  * pq2_restart fix by Wade Farnsworth <wfarnsworth@mvista.com>
10  * Copyright (c) 2006 MontaVista Software, Inc.
11  */
12 
13 #include <linux/kprobes.h>
14 
15 #include <asm/cpm2.h>
16 #include <asm/io.h>
17 #include <asm/pci-bridge.h>
18 
19 #include <platforms/82xx/pq2.h>
20 
21 #define RMR_CSRE 0x00000001
22 
pq2_restart(char * cmd)23 void __noreturn pq2_restart(char *cmd)
24 {
25 	local_irq_disable();
26 	setbits32(&cpm2_immr->im_clkrst.car_rmr, RMR_CSRE);
27 
28 	/* Clear the ME,EE,IR & DR bits in MSR to cause checkstop */
29 	mtmsr(mfmsr() & ~(MSR_ME | MSR_EE | MSR_IR | MSR_DR));
30 	in_8(&cpm2_immr->im_clkrst.res[0]);
31 
32 	panic("Restart failed\n");
33 }
NOKPROBE_SYMBOL(pq2_restart)34 NOKPROBE_SYMBOL(pq2_restart)
35 
36 #ifdef CONFIG_PCI
37 static int pq2_pci_exclude_device(struct pci_controller *hose,
38                                   u_char bus, u8 devfn)
39 {
40 	if (bus == 0 && PCI_SLOT(devfn) == 0)
41 		return PCIBIOS_DEVICE_NOT_FOUND;
42 	else
43 		return PCIBIOS_SUCCESSFUL;
44 }
45 
pq2_pci_add_bridge(struct device_node * np)46 static void __init pq2_pci_add_bridge(struct device_node *np)
47 {
48 	struct pci_controller *hose;
49 	struct resource r;
50 
51 	if (of_address_to_resource(np, 0, &r) || r.end - r.start < 0x10b)
52 		goto err;
53 
54 	pci_add_flags(PCI_REASSIGN_ALL_BUS);
55 
56 	hose = pcibios_alloc_controller(np);
57 	if (!hose)
58 		return;
59 
60 	hose->dn = np;
61 
62 	setup_indirect_pci(hose, r.start + 0x100, r.start + 0x104, 0);
63 	pci_process_bridge_OF_ranges(hose, np, 1);
64 
65 	return;
66 
67 err:
68 	printk(KERN_ERR "No valid PCI reg property in device tree\n");
69 }
70 
pq2_init_pci(void)71 void __init pq2_init_pci(void)
72 {
73 	struct device_node *np;
74 
75 	ppc_md.pci_exclude_device = pq2_pci_exclude_device;
76 
77 	for_each_compatible_node(np, NULL, "fsl,pq2-pci")
78 		pq2_pci_add_bridge(np);
79 }
80 #endif
81