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