cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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setup.c (4215B)

      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
     28void 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
     68void __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
     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 __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	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		DMA_MODE_READ = 0x44;
    154		DMA_MODE_WRITE = 0x48;
    155
    156		return 1;
    157	}
    158
    159	return 0;
    160}
    161
    162define_machine(amigaone) {
    163	.name			= "AmigaOne",
    164	.probe			= amigaone_probe,
    165	.setup_arch		= amigaone_setup_arch,
    166	.discover_phbs		= amigaone_discover_phbs,
    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};