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 
29 extern void __flush_disable_L1(void);
30 
31 void amigaone_show_cpuinfo(struct seq_file *m)
32 {
33 	seq_printf(m, "vendor\t\t: Eyetech Ltd.\n");
34 }
35 
36 static 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 %pOF\n", dev);
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 %pOF, assume"
53 		       " bus 0\n", dev);
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 
71 void __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 
86 void __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 
115 static 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 }
124 machine_device_initcall(amigaone, request_isa_regions);
125 
126 void __noreturn 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 
144 static int __init amigaone_probe(void)
145 {
146 	if (of_machine_is_compatible("eyetech,amigaone")) {
147 		/*
148 		 * Coherent memory access cause complete system lockup! Thus
149 		 * disable this CPU feature, even if the CPU needs it.
150 		 */
151 		cur_cpu_spec->cpu_features &= ~CPU_FTR_NEED_COHERENT;
152 
153 		ISA_DMA_THRESHOLD = 0x00ffffff;
154 		DMA_MODE_READ = 0x44;
155 		DMA_MODE_WRITE = 0x48;
156 
157 		return 1;
158 	}
159 
160 	return 0;
161 }
162 
163 define_machine(amigaone) {
164 	.name			= "AmigaOne",
165 	.probe			= amigaone_probe,
166 	.setup_arch		= amigaone_setup_arch,
167 	.show_cpuinfo		= amigaone_show_cpuinfo,
168 	.init_IRQ		= amigaone_init_IRQ,
169 	.restart		= amigaone_restart,
170 	.calibrate_decr		= generic_calibrate_decr,
171 	.progress		= udbg_progress,
172 };
173