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// SPDX-License-Identifier: GPL-2.0
/*
* SGI IP30 miscellaneous setup bits.
*
* Copyright (C) 2004-2007 Stanislaw Skowronek <skylark@unaligned.org>
* 2007 Joshua Kinard <kumba@gentoo.org>
* 2009 Johannes Dickgreber <tanzy@gmx.de>
*/
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/percpu.h>
#include <linux/memblock.h>
#include <asm/smp-ops.h>
#include <asm/sgialib.h>
#include <asm/time.h>
#include <asm/sgi/heart.h>
#include "ip30-common.h"
/* Structure of accessible HEART registers located in XKPHYS space. */
struct ip30_heart_regs __iomem *heart_regs = HEART_XKPHYS_BASE;
/*
* ARCS will report up to the first 1GB of
* memory if queried. Anything beyond that
* is marked as reserved.
*/
#define IP30_MAX_PROM_MEMORY _AC(0x40000000, UL)
/*
* Memory in the Octane starts at 512MB
*/
#define IP30_MEMORY_BASE _AC(0x20000000, UL)
/*
* If using ARCS to probe for memory, then
* remaining memory will start at this offset.
*/
#define IP30_REAL_MEMORY_START (IP30_MEMORY_BASE + IP30_MAX_PROM_MEMORY)
#define MEM_SHIFT(x) ((x) >> 20)
static void __init ip30_mem_init(void)
{
unsigned long total_mem;
phys_addr_t addr;
phys_addr_t size;
u32 memcfg;
int i;
total_mem = 0;
for (i = 0; i < HEART_MEMORY_BANKS; i++) {
memcfg = __raw_readl(&heart_regs->mem_cfg.l[i]);
if (!(memcfg & HEART_MEMCFG_VALID))
continue;
addr = memcfg & HEART_MEMCFG_ADDR_MASK;
addr <<= HEART_MEMCFG_UNIT_SHIFT;
addr += IP30_MEMORY_BASE;
size = memcfg & HEART_MEMCFG_SIZE_MASK;
size >>= HEART_MEMCFG_SIZE_SHIFT;
size += 1;
size <<= HEART_MEMCFG_UNIT_SHIFT;
total_mem += size;
if (addr >= IP30_REAL_MEMORY_START)
memblock_phys_free(addr, size);
else if ((addr + size) > IP30_REAL_MEMORY_START)
memblock_phys_free(IP30_REAL_MEMORY_START,
size - IP30_MAX_PROM_MEMORY);
}
pr_info("Detected %luMB of physical memory.\n", MEM_SHIFT(total_mem));
}
/**
* ip30_cpu_time_init - platform time initialization.
*/
static void __init ip30_cpu_time_init(void)
{
int cpu = smp_processor_id();
u64 heart_compare;
unsigned int start, end;
int time_diff;
heart_compare = (heart_read(&heart_regs->count) +
(HEART_CYCLES_PER_SEC / 10));
start = read_c0_count();
while ((heart_read(&heart_regs->count) - heart_compare) & 0x800000)
cpu_relax();
end = read_c0_count();
time_diff = (int)end - (int)start;
mips_hpt_frequency = time_diff * 10;
pr_info("IP30: CPU%d: %d MHz CPU detected.\n", cpu,
(mips_hpt_frequency * 2) / 1000000);
}
void __init ip30_per_cpu_init(void)
{
/* Disable all interrupts. */
clear_c0_status(ST0_IM);
ip30_cpu_time_init();
#ifdef CONFIG_SMP
ip30_install_ipi();
#endif
enable_percpu_irq(IP30_HEART_L0_IRQ, IRQ_TYPE_NONE);
enable_percpu_irq(IP30_HEART_L1_IRQ, IRQ_TYPE_NONE);
enable_percpu_irq(IP30_HEART_L2_IRQ, IRQ_TYPE_NONE);
enable_percpu_irq(IP30_HEART_ERR_IRQ, IRQ_TYPE_NONE);
}
/**
* plat_mem_setup - despite the name, misc setup happens here.
*/
void __init plat_mem_setup(void)
{
ip30_mem_init();
/* XXX: Hard lock on /sbin/init if this flag isn't specified. */
prom_flags |= PROM_FLAG_DONT_FREE_TEMP;
#ifdef CONFIG_SMP
register_smp_ops(&ip30_smp_ops);
#else
ip30_per_cpu_init();
#endif
ioport_resource.start = 0;
ioport_resource.end = ~0UL;
set_io_port_base(IO_BASE);
}
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