forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
138 lines
3.3 KiB
138 lines
3.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* SGI IP30 miscellaneous setup bits. |
|
* |
|
* Copyright (C) 2004-2007 Stanislaw Skowronek <[email protected]> |
|
* 2007 Joshua Kinard <[email protected]> |
|
* 2009 Johannes Dickgreber <[email protected]> |
|
*/ |
|
|
|
#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_free(addr, size); |
|
else if ((addr + size) > IP30_REAL_MEMORY_START) |
|
memblock_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); |
|
}
|
|
|