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
25 extern void __flush_disable_L1(void);
26
amigaone_show_cpuinfo(struct seq_file * m)27 void amigaone_show_cpuinfo(struct seq_file *m)
28 {
29 seq_printf(m, "vendor\t\t: Eyetech Ltd.\n");
30 }
31
amigaone_add_bridge(struct device_node * dev)32 static 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
amigaone_setup_arch(void)67 void __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
amigaone_init_IRQ(void)82 void __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
request_isa_regions(void)111 static 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 }
120 machine_device_initcall(amigaone, request_isa_regions);
121
amigaone_restart(char * cmd)122 void __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
amigaone_probe(void)140 static 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
define_machine(amigaone)158 define_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