setup.c

  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
 26extern void __flush_disable_L1(void);
 27
 28static void amigaone_show_cpuinfo(struct seq_file *m)
 29{
 30	seq_printf(m, "vendor\t\t: Eyetech Ltd.\n");
 31}
 32
 33static 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
 68static void __init amigaone_setup_arch(void)
 69{
 70	if (ppc_md.progress)
 71		ppc_md.progress("Linux/PPC "UTS_RELEASE"\n", 0);
 72}
 73
 74static 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
 86static 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_domain(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
126static 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
144static 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
158define_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};