1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * AmigaOne platform setup
4 *
5 * Copyright 2008 Gerhard Pircher (gerhard_pircher@gmx.net)
6 *
7 *   Based on original amigaone_setup.c source code
8 * Copyright 2003 by Hans-Joerg Frieden and Thomas Frieden
9 */
10
11#include <linux/kernel.h>
12#include <linux/of.h>
13#include <linux/of_address.h>
14#include <linux/seq_file.h>
15#include <generated/utsrelease.h>
16
17#include <asm/machdep.h>
18#include <asm/cputable.h>
19#include <asm/pci-bridge.h>
20#include <asm/i8259.h>
21#include <asm/time.h>
22#include <asm/udbg.h>
23#include <asm/dma.h>
24
25extern void __flush_disable_L1(void);
26
27void amigaone_show_cpuinfo(struct seq_file *m)
28{
29	seq_printf(m, "vendor\t\t: Eyetech Ltd.\n");
30}
31
32static int __init amigaone_add_bridge(struct device_node *dev)
33{
34	const u32 *cfg_addr, *cfg_data;
35	int len;
36	const int *bus_range;
37	struct pci_controller *hose;
38
39	printk(KERN_INFO "Adding PCI host bridge %pOF\n", dev);
40
41	cfg_addr = of_get_address(dev, 0, NULL, NULL);
42	cfg_data = of_get_address(dev, 1, NULL, NULL);
43	if ((cfg_addr == NULL) || (cfg_data == NULL))
44		return -ENODEV;
45
46	bus_range = of_get_property(dev, "bus-range", &len);
47	if ((bus_range == NULL) || (len < 2 * sizeof(int)))
48		printk(KERN_WARNING "Can't get bus-range for %pOF, assume"
49		       " bus 0\n", dev);
50
51	hose = pcibios_alloc_controller(dev);
52	if (hose == NULL)
53		return -ENOMEM;
54
55	hose->first_busno = bus_range ? bus_range[0] : 0;
56	hose->last_busno = bus_range ? bus_range[1] : 0xff;
57
58	setup_indirect_pci(hose, cfg_addr[0], cfg_data[0], 0);
59
60	/* Interpret the "ranges" property */
61	/* This also maps the I/O region and sets isa_io/mem_base */
62	pci_process_bridge_OF_ranges(hose, dev, 1);
63
64	return 0;
65}
66
67void __init amigaone_setup_arch(void)
68{
69	struct device_node *np;
70	int phb = -ENODEV;
71
72	/* Lookup PCI host bridges. */
73	for_each_compatible_node(np, "pci", "mai-logic,articia-s")
74		phb = amigaone_add_bridge(np);
75
76	BUG_ON(phb != 0);
77
78	if (ppc_md.progress)
79		ppc_md.progress("Linux/PPC "UTS_RELEASE"\n", 0);
80}
81
82void __init amigaone_init_IRQ(void)
83{
84	struct device_node *pic, *np = NULL;
85	const unsigned long *prop = NULL;
86	unsigned long int_ack = 0;
87
88	/* Search for ISA interrupt controller. */
89	pic = of_find_compatible_node(NULL, "interrupt-controller",
90	                              "pnpPNP,000");
91	BUG_ON(pic == NULL);
92
93	/* Look for interrupt acknowledge address in the PCI root node. */
94	np = of_find_compatible_node(NULL, "pci", "mai-logic,articia-s");
95	if (np) {
96		prop = of_get_property(np, "8259-interrupt-acknowledge", NULL);
97		if (prop)
98			int_ack = prop[0];
99		of_node_put(np);
100	}
101
102	if (int_ack == 0)
103		printk(KERN_WARNING "Cannot find PCI interrupt acknowledge"
104		       " address, polling\n");
105
106	i8259_init(pic, int_ack);
107	ppc_md.get_irq = i8259_irq;
108	irq_set_default_host(i8259_get_host());
109}
110
111static int __init request_isa_regions(void)
112{
113	request_region(0x00, 0x20, "dma1");
114	request_region(0x40, 0x20, "timer");
115	request_region(0x80, 0x10, "dma page reg");
116	request_region(0xc0, 0x20, "dma2");
117
118	return 0;
119}
120machine_device_initcall(amigaone, request_isa_regions);
121
122void __noreturn amigaone_restart(char *cmd)
123{
124	local_irq_disable();
125
126	/* Flush and disable caches. */
127	__flush_disable_L1();
128
129        /* Set SRR0 to the reset vector and turn on MSR_IP. */
130	mtspr(SPRN_SRR0, 0xfff00100);
131	mtspr(SPRN_SRR1, MSR_IP);
132
133	/* Do an rfi to jump back to firmware. */
134	__asm__ __volatile__("rfi" : : : "memory");
135
136	/* Not reached. */
137	while (1);
138}
139
140static int __init amigaone_probe(void)
141{
142	if (of_machine_is_compatible("eyetech,amigaone")) {
143		/*
144		 * Coherent memory access cause complete system lockup! Thus
145		 * disable this CPU feature, even if the CPU needs it.
146		 */
147		cur_cpu_spec->cpu_features &= ~CPU_FTR_NEED_COHERENT;
148
149		DMA_MODE_READ = 0x44;
150		DMA_MODE_WRITE = 0x48;
151
152		return 1;
153	}
154
155	return 0;
156}
157
158define_machine(amigaone) {
159	.name			= "AmigaOne",
160	.probe			= amigaone_probe,
161	.setup_arch		= amigaone_setup_arch,
162	.show_cpuinfo		= amigaone_show_cpuinfo,
163	.init_IRQ		= amigaone_init_IRQ,
164	.restart		= amigaone_restart,
165	.calibrate_decr		= generic_calibrate_decr,
166	.progress		= udbg_progress,
167};
168