diff options
Diffstat (limited to 'arch/powerpc/platforms/amigaone/setup.c')
| -rw-r--r-- | arch/powerpc/platforms/amigaone/setup.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/amigaone/setup.c b/arch/powerpc/platforms/amigaone/setup.c new file mode 100644 index 000000000..397ce6a40 --- /dev/null +++ b/arch/powerpc/platforms/amigaone/setup.c @@ -0,0 +1,172 @@ +// 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/irqdomain.h> +#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) +{ + if (ppc_md.progress) + ppc_md.progress("Linux/PPC "UTS_RELEASE"\n", 0); +} + +static void __init amigaone_discover_phbs(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); +} + +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, + .discover_phbs = amigaone_discover_phbs, + .show_cpuinfo = amigaone_show_cpuinfo, + .init_IRQ = amigaone_init_IRQ, + .restart = amigaone_restart, + .calibrate_decr = generic_calibrate_decr, + .progress = udbg_progress, +}; |