Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * 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
 */
 
#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 %pOF\n", dev);
 
<------>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 %pOF, assume"
<------><------>       " bus 0\n", dev);
 
<------>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;
 
<------><------>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,
};