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/irqdomain.h>
12 #include <linux/kernel.h>
13 #include <linux/of.h>
14 #include <linux/of_address.h>
15 #include <linux/seq_file.h>
16 #include <generated/utsrelease.h>
17
18 #include <asm/machdep.h>
19 #include <asm/cputable.h>
20 #include <asm/pci-bridge.h>
21 #include <asm/i8259.h>
22 #include <asm/time.h>
23 #include <asm/udbg.h>
24 #include <asm/dma.h>
25
26 extern void __flush_disable_L1(void);
27
28 static void amigaone_show_cpuinfo(struct seq_file *m)
29 {
30 seq_printf(m, "vendor\t\t: Eyetech Ltd.\n");
31 }
32
33 static int __init amigaone_add_bridge(struct device_node *dev)
34 {
35 const u32 *cfg_addr, *cfg_data;
36 int len;
37 const int *bus_range;
38 struct pci_controller *hose;
39
40 printk(KERN_INFO "Adding PCI host bridge %pOF\n", dev);
41
42 cfg_addr = of_get_address(dev, 0, NULL, NULL);
43 cfg_data = of_get_address(dev, 1, NULL, NULL);
44 if ((cfg_addr == NULL) || (cfg_data == NULL))
45 return -ENODEV;
46
47 bus_range = of_get_property(dev, "bus-range", &len);
48 if ((bus_range == NULL) || (len < 2 * sizeof(int)))
49 printk(KERN_WARNING "Can't get bus-range for %pOF, assume"
50 " bus 0\n", dev);
51
52 hose = pcibios_alloc_controller(dev);
53 if (hose == NULL)
54 return -ENOMEM;
55
56 hose->first_busno = bus_range ? bus_range[0] : 0;
57 hose->last_busno = bus_range ? bus_range[1] : 0xff;
58
59 setup_indirect_pci(hose, cfg_addr[0], cfg_data[0], 0);
60
61 /* Interpret the "ranges" property */
62 /* This also maps the I/O region and sets isa_io/mem_base */
63 pci_process_bridge_OF_ranges(hose, dev, 1);
64
65 return 0;
66 }
67
68 static void __init amigaone_setup_arch(void)
69 {
70 if (ppc_md.progress)
71 ppc_md.progress("Linux/PPC "UTS_RELEASE"\n", 0);
72 }
73
74 static void __init amigaone_discover_phbs(void)
75 {
76 struct device_node *np;
77 int phb = -ENODEV;
78
79 /* Lookup PCI host bridges. */
80 for_each_compatible_node(np, "pci", "mai-logic,articia-s")
81 phb = amigaone_add_bridge(np);
82
83 BUG_ON(phb != 0);
84 }
85
86 static 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 static 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 /*
147 * Coherent memory access cause complete system lockup! Thus
148 * disable this CPU feature, even if the CPU needs it.
149 */
150 cur_cpu_spec->cpu_features &= ~CPU_FTR_NEED_COHERENT;
151
152 DMA_MODE_READ = 0x44;
153 DMA_MODE_WRITE = 0x48;
154
155 return 1;
156 }
157
158 define_machine(amigaone) {
159 .name = "AmigaOne",
160 .compatible = "eyetech,amigaone",
161 .probe = amigaone_probe,
162 .setup_arch = amigaone_setup_arch,
163 .discover_phbs = amigaone_discover_phbs,
164 .show_cpuinfo = amigaone_show_cpuinfo,
165 .init_IRQ = amigaone_init_IRQ,
166 .restart = amigaone_restart,
167 .progress = udbg_progress,
168 };
169
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