1/*
2 * AmigaOne platform setup
3 *
4 * Copyright 2008 Gerhard Pircher (gerhard_pircher@gmx.net)
5 *
6 *   Based on original amigaone_setup.c source code
7 * Copyright 2003 by Hans-Joerg Frieden and Thomas Frieden
8 *
9 * This program is free software; you can redistribute  it and/or modify it
10 * under  the terms of  the GNU General  Public License as published by the
11 * Free Software Foundation;  either version 2 of the  License, or (at your
12 * option) any later version.
13 */
14
15#include <linux/kernel.h>
16#include <linux/of.h>
17#include <linux/of_address.h>
18#include <linux/seq_file.h>
19#include <generated/utsrelease.h>
20
21#include <asm/machdep.h>
22#include <asm/cputable.h>
23#include <asm/pci-bridge.h>
24#include <asm/i8259.h>
25#include <asm/time.h>
26#include <asm/udbg.h>
27#include <asm/dma.h>
28
29extern void __flush_disable_L1(void);
30
31void amigaone_show_cpuinfo(struct seq_file *m)
32{
33	seq_printf(m, "vendor\t\t: Eyetech Ltd.\n");
34}
35
36static int __init amigaone_add_bridge(struct device_node *dev)
37{
38	const u32 *cfg_addr, *cfg_data;
39	int len;
40	const int *bus_range;
41	struct pci_controller *hose;
42
43	printk(KERN_INFO "Adding PCI host bridge %s\n", dev->full_name);
44
45	cfg_addr = of_get_address(dev, 0, NULL, NULL);
46	cfg_data = of_get_address(dev, 1, NULL, NULL);
47	if ((cfg_addr == NULL) || (cfg_data == NULL))
48		return -ENODEV;
49
50	bus_range = of_get_property(dev, "bus-range", &len);
51	if ((bus_range == NULL) || (len < 2 * sizeof(int)))
52		printk(KERN_WARNING "Can't get bus-range for %s, assume"
53		       " bus 0\n", dev->full_name);
54
55	hose = pcibios_alloc_controller(dev);
56	if (hose == NULL)
57		return -ENOMEM;
58
59	hose->first_busno = bus_range ? bus_range[0] : 0;
60	hose->last_busno = bus_range ? bus_range[1] : 0xff;
61
62	setup_indirect_pci(hose, cfg_addr[0], cfg_data[0], 0);
63
64	/* Interpret the "ranges" property */
65	/* This also maps the I/O region and sets isa_io/mem_base */
66	pci_process_bridge_OF_ranges(hose, dev, 1);
67
68	return 0;
69}
70
71void __init amigaone_setup_arch(void)
72{
73	struct device_node *np;
74	int phb = -ENODEV;
75
76	/* Lookup PCI host bridges. */
77	for_each_compatible_node(np, "pci", "mai-logic,articia-s")
78		phb = amigaone_add_bridge(np);
79
80	BUG_ON(phb != 0);
81
82	if (ppc_md.progress)
83		ppc_md.progress("Linux/PPC "UTS_RELEASE"\n", 0);
84}
85
86void __init amigaone_init_IRQ(void)
87{
88	struct device_node *pic, *np = NULL;
89	const unsigned long *prop = NULL;
90	unsigned long int_ack = 0;
91
92	/* Search for ISA interrupt controller. */
93	pic = of_find_compatible_node(NULL, "interrupt-controller",
94	                              "pnpPNP,000");
95	BUG_ON(pic == NULL);
96
97	/* Look for interrupt acknowledge address in the PCI root node. */
98	np = of_find_compatible_node(NULL, "pci", "mai-logic,articia-s");
99	if (np) {
100		prop = of_get_property(np, "8259-interrupt-acknowledge", NULL);
101		if (prop)
102			int_ack = prop[0];
103		of_node_put(np);
104	}
105
106	if (int_ack == 0)
107		printk(KERN_WARNING "Cannot find PCI interrupt acknowledge"
108		       " address, polling\n");
109
110	i8259_init(pic, int_ack);
111	ppc_md.get_irq = i8259_irq;
112	irq_set_default_host(i8259_get_host());
113}
114
115static int __init request_isa_regions(void)
116{
117	request_region(0x00, 0x20, "dma1");
118	request_region(0x40, 0x20, "timer");
119	request_region(0x80, 0x10, "dma page reg");
120	request_region(0xc0, 0x20, "dma2");
121
122	return 0;
123}
124machine_device_initcall(amigaone, request_isa_regions);
125
126void amigaone_restart(char *cmd)
127{
128	local_irq_disable();
129
130	/* Flush and disable caches. */
131	__flush_disable_L1();
132
133        /* Set SRR0 to the reset vector and turn on MSR_IP. */
134	mtspr(SPRN_SRR0, 0xfff00100);
135	mtspr(SPRN_SRR1, MSR_IP);
136
137	/* Do an rfi to jump back to firmware. */
138	__asm__ __volatile__("rfi" : : : "memory");
139
140	/* Not reached. */
141	while (1);
142}
143
144static int __init amigaone_probe(void)
145{
146	unsigned long root = of_get_flat_dt_root();
147
148	if (of_flat_dt_is_compatible(root, "eyetech,amigaone")) {
149		/*
150		 * Coherent memory access cause complete system lockup! Thus
151		 * disable this CPU feature, even if the CPU needs it.
152		 */
153		cur_cpu_spec->cpu_features &= ~CPU_FTR_NEED_COHERENT;
154
155		ISA_DMA_THRESHOLD = 0x00ffffff;
156		DMA_MODE_READ = 0x44;
157		DMA_MODE_WRITE = 0x48;
158
159		return 1;
160	}
161
162	return 0;
163}
164
165define_machine(amigaone) {
166	.name			= "AmigaOne",
167	.probe			= amigaone_probe,
168	.setup_arch		= amigaone_setup_arch,
169	.show_cpuinfo		= amigaone_show_cpuinfo,
170	.init_IRQ		= amigaone_init_IRQ,
171	.restart		= amigaone_restart,
172	.calibrate_decr		= generic_calibrate_decr,
173	.progress		= udbg_progress,
174};
175