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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* arch/powerpc/platforms/embedded6xx/wii.c
*
* Nintendo Wii board-specific support
* Copyright (C) 2008-2009 The GameCube Linux Team
* Copyright (C) 2008,2009 Albert Herranz
*/
#define DRV_MODULE_NAME "wii"
#define pr_fmt(fmt) DRV_MODULE_NAME ": " fmt
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/seq_file.h>
#include <linux/of_platform.h>
#include <linux/memblock.h>
#include <mm/mmu_decl.h>
#include <asm/io.h>
#include <asm/machdep.h>
#include <asm/prom.h>
#include <asm/time.h>
#include <asm/udbg.h>
#include "flipper-pic.h"
#include "hlwd-pic.h"
#include "usbgecko_udbg.h"
/* control block */
#define HW_CTRL_COMPATIBLE "nintendo,hollywood-control"
#define HW_CTRL_RESETS 0x94
#define HW_CTRL_RESETS_SYS (1<<0)
/* gpio */
#define HW_GPIO_COMPATIBLE "nintendo,hollywood-gpio"
#define HW_GPIO_BASE(idx) (idx * 0x20)
#define HW_GPIO_OUT(idx) (HW_GPIO_BASE(idx) + 0)
#define HW_GPIO_DIR(idx) (HW_GPIO_BASE(idx) + 4)
#define HW_GPIO_OWNER (HW_GPIO_BASE(1) + 0x1c)
#define HW_GPIO_SHUTDOWN (1<<1)
#define HW_GPIO_SLOT_LED (1<<5)
#define HW_GPIO_SENSOR_BAR (1<<8)
static void __iomem *hw_ctrl;
static void __iomem *hw_gpio;
static int __init page_aligned(unsigned long x)
{
return !(x & (PAGE_SIZE-1));
}
void __init wii_memory_fixups(void)
{
struct memblock_region *p = memblock.memory.regions;
BUG_ON(memblock.memory.cnt != 2);
BUG_ON(!page_aligned(p[0].base) || !page_aligned(p[1].base));
}
static void __noreturn wii_spin(void)
{
local_irq_disable();
for (;;)
cpu_relax();
}
static void __iomem *wii_ioremap_hw_regs(char *name, char *compatible)
{
void __iomem *hw_regs = NULL;
struct device_node *np;
struct resource res;
int error = -ENODEV;
np = of_find_compatible_node(NULL, NULL, compatible);
if (!np) {
pr_err("no compatible node found for %s\n", compatible);
goto out;
}
error = of_address_to_resource(np, 0, &res);
if (error) {
pr_err("no valid reg found for %pOFn\n", np);
goto out_put;
}
hw_regs = ioremap(res.start, resource_size(&res));
if (hw_regs) {
pr_info("%s at 0x%08x mapped to 0x%p\n", name,
res.start, hw_regs);
}
out_put:
of_node_put(np);
out:
return hw_regs;
}
static void __init wii_setup_arch(void)
{
hw_ctrl = wii_ioremap_hw_regs("hw_ctrl", HW_CTRL_COMPATIBLE);
hw_gpio = wii_ioremap_hw_regs("hw_gpio", HW_GPIO_COMPATIBLE);
if (hw_gpio) {
/* turn off the front blue led and IR light */
clrbits32(hw_gpio + HW_GPIO_OUT(0),
HW_GPIO_SLOT_LED | HW_GPIO_SENSOR_BAR);
}
}
static void __noreturn wii_restart(char *cmd)
{
local_irq_disable();
if (hw_ctrl) {
/* clear the system reset pin to cause a reset */
clrbits32(hw_ctrl + HW_CTRL_RESETS, HW_CTRL_RESETS_SYS);
}
wii_spin();
}
static void wii_power_off(void)
{
local_irq_disable();
if (hw_gpio) {
/*
* set the owner of the shutdown pin to ARM, because it is
* accessed through the registers for the ARM, below
*/
clrbits32(hw_gpio + HW_GPIO_OWNER, HW_GPIO_SHUTDOWN);
/* make sure that the poweroff GPIO is configured as output */
setbits32(hw_gpio + HW_GPIO_DIR(1), HW_GPIO_SHUTDOWN);
/* drive the poweroff GPIO high */
setbits32(hw_gpio + HW_GPIO_OUT(1), HW_GPIO_SHUTDOWN);
}
wii_spin();
}
static void __noreturn wii_halt(void)
{
if (ppc_md.restart)
ppc_md.restart(NULL);
wii_spin();
}
static void __init wii_pic_probe(void)
{
flipper_pic_probe();
hlwd_pic_probe();
}
static int __init wii_probe(void)
{
if (!of_machine_is_compatible("nintendo,wii"))
return 0;
pm_power_off = wii_power_off;
ug_udbg_init();
return 1;
}
static void wii_shutdown(void)
{
hlwd_quiesce();
flipper_quiesce();
}
define_machine(wii) {
.name = "wii",
.probe = wii_probe,
.setup_arch = wii_setup_arch,
.restart = wii_restart,
.halt = wii_halt,
.init_IRQ = wii_pic_probe,
.get_irq = flipper_pic_get_irq,
.calibrate_decr = generic_calibrate_decr,
.progress = udbg_progress,
.machine_shutdown = wii_shutdown,
};
static const struct of_device_id wii_of_bus[] = {
{ .compatible = "nintendo,hollywood", },
{ },
};
static int __init wii_device_probe(void)
{
if (!machine_is(wii))
return 0;
of_platform_populate(NULL, wii_of_bus, NULL, NULL);
return 0;
}
device_initcall(wii_device_probe);
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