364 lines
8.8 KiB
C
364 lines
8.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Maple (970 eval board) setup code
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*
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* (c) Copyright 2004 Benjamin Herrenschmidt (benh@kernel.crashing.org),
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* IBM Corp.
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*/
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#undef DEBUG
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/mm.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/ptrace.h>
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#include <linux/user.h>
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#include <linux/tty.h>
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#include <linux/string.h>
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#include <linux/delay.h>
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#include <linux/ioport.h>
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#include <linux/major.h>
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#include <linux/initrd.h>
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#include <linux/vt_kern.h>
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#include <linux/console.h>
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#include <linux/pci.h>
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#include <linux/adb.h>
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#include <linux/cuda.h>
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#include <linux/pmu.h>
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#include <linux/irq.h>
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#include <linux/seq_file.h>
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#include <linux/root_dev.h>
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#include <linux/serial.h>
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#include <linux/smp.h>
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#include <linux/bitops.h>
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#include <linux/of_device.h>
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#include <linux/memblock.h>
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#include <asm/processor.h>
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#include <asm/sections.h>
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#include <asm/prom.h>
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#include <asm/io.h>
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#include <asm/pci-bridge.h>
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#include <asm/iommu.h>
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#include <asm/machdep.h>
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#include <asm/dma.h>
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#include <asm/cputable.h>
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#include <asm/time.h>
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#include <asm/mpic.h>
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#include <asm/rtas.h>
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#include <asm/udbg.h>
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#include <asm/nvram.h>
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#include "maple.h"
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#ifdef DEBUG
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#define DBG(fmt...) udbg_printf(fmt)
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#else
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#define DBG(fmt...)
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#endif
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static unsigned long maple_find_nvram_base(void)
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{
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struct device_node *rtcs;
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unsigned long result = 0;
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/* find NVRAM device */
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rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111");
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if (rtcs) {
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struct resource r;
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if (of_address_to_resource(rtcs, 0, &r)) {
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printk(KERN_EMERG "Maple: Unable to translate NVRAM"
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" address\n");
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goto bail;
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}
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if (!(r.flags & IORESOURCE_IO)) {
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printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n");
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goto bail;
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}
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result = r.start;
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} else
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printk(KERN_EMERG "Maple: Unable to find NVRAM\n");
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bail:
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of_node_put(rtcs);
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return result;
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}
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static void __noreturn maple_restart(char *cmd)
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{
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unsigned int maple_nvram_base;
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const unsigned int *maple_nvram_offset, *maple_nvram_command;
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struct device_node *sp;
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maple_nvram_base = maple_find_nvram_base();
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if (maple_nvram_base == 0)
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goto fail;
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/* find service processor device */
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sp = of_find_node_by_name(NULL, "service-processor");
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if (!sp) {
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printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
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goto fail;
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}
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maple_nvram_offset = of_get_property(sp, "restart-addr", NULL);
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maple_nvram_command = of_get_property(sp, "restart-value", NULL);
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of_node_put(sp);
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/* send command */
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outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
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for (;;) ;
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fail:
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printk(KERN_EMERG "Maple: Manual Restart Required\n");
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for (;;) ;
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}
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static void __noreturn maple_power_off(void)
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{
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unsigned int maple_nvram_base;
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const unsigned int *maple_nvram_offset, *maple_nvram_command;
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struct device_node *sp;
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maple_nvram_base = maple_find_nvram_base();
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if (maple_nvram_base == 0)
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goto fail;
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/* find service processor device */
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sp = of_find_node_by_name(NULL, "service-processor");
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if (!sp) {
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printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
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goto fail;
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}
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maple_nvram_offset = of_get_property(sp, "power-off-addr", NULL);
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maple_nvram_command = of_get_property(sp, "power-off-value", NULL);
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of_node_put(sp);
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/* send command */
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outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
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for (;;) ;
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fail:
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printk(KERN_EMERG "Maple: Manual Power-Down Required\n");
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for (;;) ;
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}
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static void __noreturn maple_halt(void)
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{
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maple_power_off();
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}
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#ifdef CONFIG_SMP
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static struct smp_ops_t maple_smp_ops = {
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.probe = smp_mpic_probe,
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.message_pass = smp_mpic_message_pass,
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.kick_cpu = smp_generic_kick_cpu,
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.setup_cpu = smp_mpic_setup_cpu,
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.give_timebase = smp_generic_give_timebase,
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.take_timebase = smp_generic_take_timebase,
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};
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#endif /* CONFIG_SMP */
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static void __init maple_use_rtas_reboot_and_halt_if_present(void)
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{
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if (rtas_service_present("system-reboot") &&
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rtas_service_present("power-off")) {
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ppc_md.restart = rtas_restart;
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pm_power_off = rtas_power_off;
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ppc_md.halt = rtas_halt;
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}
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}
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static void __init maple_setup_arch(void)
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{
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/* init to some ~sane value until calibrate_delay() runs */
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loops_per_jiffy = 50000000;
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/* Setup SMP callback */
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#ifdef CONFIG_SMP
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smp_ops = &maple_smp_ops;
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#endif
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maple_use_rtas_reboot_and_halt_if_present();
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printk(KERN_DEBUG "Using native/NAP idle loop\n");
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mmio_nvram_init();
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}
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/*
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* This is almost identical to pSeries and CHRP. We need to make that
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* code generic at one point, with appropriate bits in the device-tree to
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* identify the presence of an HT APIC
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*/
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static void __init maple_init_IRQ(void)
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{
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struct device_node *root, *np, *mpic_node = NULL;
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const unsigned int *opprop;
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unsigned long openpic_addr = 0;
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int naddr, n, i, opplen, has_isus = 0;
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struct mpic *mpic;
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unsigned int flags = 0;
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/* Locate MPIC in the device-tree. Note that there is a bug
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* in Maple device-tree where the type of the controller is
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* open-pic and not interrupt-controller
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*/
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for_each_node_by_type(np, "interrupt-controller")
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if (of_device_is_compatible(np, "open-pic")) {
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mpic_node = np;
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break;
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}
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if (mpic_node == NULL)
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for_each_node_by_type(np, "open-pic") {
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mpic_node = np;
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break;
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}
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if (mpic_node == NULL) {
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printk(KERN_ERR
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"Failed to locate the MPIC interrupt controller\n");
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return;
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}
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/* Find address list in /platform-open-pic */
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root = of_find_node_by_path("/");
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naddr = of_n_addr_cells(root);
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opprop = of_get_property(root, "platform-open-pic", &opplen);
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if (opprop) {
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openpic_addr = of_read_number(opprop, naddr);
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has_isus = (opplen > naddr);
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printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n",
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openpic_addr, has_isus);
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}
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BUG_ON(openpic_addr == 0);
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/* Check for a big endian MPIC */
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if (of_get_property(np, "big-endian", NULL) != NULL)
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flags |= MPIC_BIG_ENDIAN;
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/* XXX Maple specific bits */
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flags |= MPIC_U3_HT_IRQS;
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/* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */
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flags |= MPIC_BIG_ENDIAN;
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/* Setup the openpic driver. More device-tree junks, we hard code no
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* ISUs for now. I'll have to revisit some stuffs with the folks doing
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* the firmware for those
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*/
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mpic = mpic_alloc(mpic_node, openpic_addr, flags,
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/*has_isus ? 16 :*/ 0, 0, " MPIC ");
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BUG_ON(mpic == NULL);
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/* Add ISUs */
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opplen /= sizeof(u32);
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for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
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unsigned long isuaddr = of_read_number(opprop + i, naddr);
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mpic_assign_isu(mpic, n, isuaddr);
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}
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/* All ISUs are setup, complete initialization */
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mpic_init(mpic);
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ppc_md.get_irq = mpic_get_irq;
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of_node_put(mpic_node);
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of_node_put(root);
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}
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static void __init maple_progress(char *s, unsigned short hex)
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{
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printk("*** %04x : %s\n", hex, s ? s : "");
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}
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/*
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* Called very early, MMU is off, device-tree isn't unflattened
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*/
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static int __init maple_probe(void)
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{
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if (!of_machine_is_compatible("Momentum,Maple") &&
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!of_machine_is_compatible("Momentum,Apache"))
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return 0;
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pm_power_off = maple_power_off;
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iommu_init_early_dart(&maple_pci_controller_ops);
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return 1;
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}
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#ifdef CONFIG_EDAC
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/*
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* Register a platform device for CPC925 memory controller on
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* all boards with U3H (CPC925) bridge.
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*/
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static int __init maple_cpc925_edac_setup(void)
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{
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struct platform_device *pdev;
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struct device_node *np = NULL;
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struct resource r;
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int ret;
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volatile void __iomem *mem;
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u32 rev;
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np = of_find_node_by_type(NULL, "memory-controller");
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if (!np) {
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printk(KERN_ERR "%s: Unable to find memory-controller node\n",
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__func__);
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return -ENODEV;
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}
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ret = of_address_to_resource(np, 0, &r);
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of_node_put(np);
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if (ret < 0) {
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printk(KERN_ERR "%s: Unable to get memory-controller reg\n",
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__func__);
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return -ENODEV;
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}
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mem = ioremap(r.start, resource_size(&r));
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if (!mem) {
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printk(KERN_ERR "%s: Unable to map memory-controller memory\n",
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__func__);
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return -ENOMEM;
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}
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rev = __raw_readl(mem);
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iounmap(mem);
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if (rev < 0x34 || rev > 0x3f) { /* U3H */
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printk(KERN_ERR "%s: Non-CPC925(U3H) bridge revision: %02x\n",
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__func__, rev);
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return 0;
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}
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pdev = platform_device_register_simple("cpc925_edac", 0, &r, 1);
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if (IS_ERR(pdev))
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return PTR_ERR(pdev);
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printk(KERN_INFO "%s: CPC925 platform device created\n", __func__);
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return 0;
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}
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machine_device_initcall(maple, maple_cpc925_edac_setup);
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#endif
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define_machine(maple) {
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.name = "Maple",
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.probe = maple_probe,
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.setup_arch = maple_setup_arch,
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.discover_phbs = maple_pci_init,
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.init_IRQ = maple_init_IRQ,
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.pci_irq_fixup = maple_pci_irq_fixup,
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.pci_get_legacy_ide_irq = maple_pci_get_legacy_ide_irq,
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.restart = maple_restart,
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.halt = maple_halt,
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.get_boot_time = maple_get_boot_time,
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.set_rtc_time = maple_set_rtc_time,
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.get_rtc_time = maple_get_rtc_time,
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.calibrate_decr = generic_calibrate_decr,
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.progress = maple_progress,
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.power_save = power4_idle,
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};
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