![Benjamin Herrenschmidt](/assets/img/avatar_default.png)
This converts all the 32-bit platforms to use the expanded device-tree which is a pretty mechanical change. Unlike 64-bit, the 32-bit kernel didn't rely on platform initializations to setup the MMU since it sets it up entirely before probe_machine() so the move has comparatively less consequences though it's a bigger patch. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
173 lines
4.3 KiB
C
173 lines
4.3 KiB
C
/*
|
|
* AmigaOne platform setup
|
|
*
|
|
* Copyright 2008 Gerhard Pircher (gerhard_pircher@gmx.net)
|
|
*
|
|
* Based on original amigaone_setup.c source code
|
|
* Copyright 2003 by Hans-Joerg Frieden and Thomas Frieden
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/seq_file.h>
|
|
#include <generated/utsrelease.h>
|
|
|
|
#include <asm/machdep.h>
|
|
#include <asm/cputable.h>
|
|
#include <asm/pci-bridge.h>
|
|
#include <asm/i8259.h>
|
|
#include <asm/time.h>
|
|
#include <asm/udbg.h>
|
|
#include <asm/dma.h>
|
|
|
|
extern void __flush_disable_L1(void);
|
|
|
|
void amigaone_show_cpuinfo(struct seq_file *m)
|
|
{
|
|
seq_printf(m, "vendor\t\t: Eyetech Ltd.\n");
|
|
}
|
|
|
|
static int __init amigaone_add_bridge(struct device_node *dev)
|
|
{
|
|
const u32 *cfg_addr, *cfg_data;
|
|
int len;
|
|
const int *bus_range;
|
|
struct pci_controller *hose;
|
|
|
|
printk(KERN_INFO "Adding PCI host bridge %s\n", dev->full_name);
|
|
|
|
cfg_addr = of_get_address(dev, 0, NULL, NULL);
|
|
cfg_data = of_get_address(dev, 1, NULL, NULL);
|
|
if ((cfg_addr == NULL) || (cfg_data == NULL))
|
|
return -ENODEV;
|
|
|
|
bus_range = of_get_property(dev, "bus-range", &len);
|
|
if ((bus_range == NULL) || (len < 2 * sizeof(int)))
|
|
printk(KERN_WARNING "Can't get bus-range for %s, assume"
|
|
" bus 0\n", dev->full_name);
|
|
|
|
hose = pcibios_alloc_controller(dev);
|
|
if (hose == NULL)
|
|
return -ENOMEM;
|
|
|
|
hose->first_busno = bus_range ? bus_range[0] : 0;
|
|
hose->last_busno = bus_range ? bus_range[1] : 0xff;
|
|
|
|
setup_indirect_pci(hose, cfg_addr[0], cfg_data[0], 0);
|
|
|
|
/* Interpret the "ranges" property */
|
|
/* This also maps the I/O region and sets isa_io/mem_base */
|
|
pci_process_bridge_OF_ranges(hose, dev, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void __init amigaone_setup_arch(void)
|
|
{
|
|
struct device_node *np;
|
|
int phb = -ENODEV;
|
|
|
|
/* Lookup PCI host bridges. */
|
|
for_each_compatible_node(np, "pci", "mai-logic,articia-s")
|
|
phb = amigaone_add_bridge(np);
|
|
|
|
BUG_ON(phb != 0);
|
|
|
|
if (ppc_md.progress)
|
|
ppc_md.progress("Linux/PPC "UTS_RELEASE"\n", 0);
|
|
}
|
|
|
|
void __init amigaone_init_IRQ(void)
|
|
{
|
|
struct device_node *pic, *np = NULL;
|
|
const unsigned long *prop = NULL;
|
|
unsigned long int_ack = 0;
|
|
|
|
/* Search for ISA interrupt controller. */
|
|
pic = of_find_compatible_node(NULL, "interrupt-controller",
|
|
"pnpPNP,000");
|
|
BUG_ON(pic == NULL);
|
|
|
|
/* Look for interrupt acknowledge address in the PCI root node. */
|
|
np = of_find_compatible_node(NULL, "pci", "mai-logic,articia-s");
|
|
if (np) {
|
|
prop = of_get_property(np, "8259-interrupt-acknowledge", NULL);
|
|
if (prop)
|
|
int_ack = prop[0];
|
|
of_node_put(np);
|
|
}
|
|
|
|
if (int_ack == 0)
|
|
printk(KERN_WARNING "Cannot find PCI interrupt acknowledge"
|
|
" address, polling\n");
|
|
|
|
i8259_init(pic, int_ack);
|
|
ppc_md.get_irq = i8259_irq;
|
|
irq_set_default_host(i8259_get_host());
|
|
}
|
|
|
|
static int __init request_isa_regions(void)
|
|
{
|
|
request_region(0x00, 0x20, "dma1");
|
|
request_region(0x40, 0x20, "timer");
|
|
request_region(0x80, 0x10, "dma page reg");
|
|
request_region(0xc0, 0x20, "dma2");
|
|
|
|
return 0;
|
|
}
|
|
machine_device_initcall(amigaone, request_isa_regions);
|
|
|
|
void __noreturn amigaone_restart(char *cmd)
|
|
{
|
|
local_irq_disable();
|
|
|
|
/* Flush and disable caches. */
|
|
__flush_disable_L1();
|
|
|
|
/* Set SRR0 to the reset vector and turn on MSR_IP. */
|
|
mtspr(SPRN_SRR0, 0xfff00100);
|
|
mtspr(SPRN_SRR1, MSR_IP);
|
|
|
|
/* Do an rfi to jump back to firmware. */
|
|
__asm__ __volatile__("rfi" : : : "memory");
|
|
|
|
/* Not reached. */
|
|
while (1);
|
|
}
|
|
|
|
static int __init amigaone_probe(void)
|
|
{
|
|
if (of_machine_is_compatible("eyetech,amigaone")) {
|
|
/*
|
|
* Coherent memory access cause complete system lockup! Thus
|
|
* disable this CPU feature, even if the CPU needs it.
|
|
*/
|
|
cur_cpu_spec->cpu_features &= ~CPU_FTR_NEED_COHERENT;
|
|
|
|
ISA_DMA_THRESHOLD = 0x00ffffff;
|
|
DMA_MODE_READ = 0x44;
|
|
DMA_MODE_WRITE = 0x48;
|
|
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
define_machine(amigaone) {
|
|
.name = "AmigaOne",
|
|
.probe = amigaone_probe,
|
|
.setup_arch = amigaone_setup_arch,
|
|
.show_cpuinfo = amigaone_show_cpuinfo,
|
|
.init_IRQ = amigaone_init_IRQ,
|
|
.restart = amigaone_restart,
|
|
.calibrate_decr = generic_calibrate_decr,
|
|
.progress = udbg_progress,
|
|
};
|