355 lines
7.5 KiB
C
355 lines
7.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* linux/arch/unicore32/kernel/setup.c
|
|
*
|
|
* Code specific to PKUnity SoC and UniCore ISA
|
|
*
|
|
* Copyright (C) 2001-2010 GUAN Xue-tao
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/utsname.h>
|
|
#include <linux/initrd.h>
|
|
#include <linux/console.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/screen_info.h>
|
|
#include <linux/init.h>
|
|
#include <linux/root_dev.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/elf.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <asm/cputype.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/traps.h>
|
|
#include <asm/memblock.h>
|
|
|
|
#include "setup.h"
|
|
|
|
#ifndef MEM_SIZE
|
|
#define MEM_SIZE (16*1024*1024)
|
|
#endif
|
|
|
|
struct stack {
|
|
u32 irq[3];
|
|
u32 abt[3];
|
|
u32 und[3];
|
|
} ____cacheline_aligned;
|
|
|
|
static struct stack stacks[NR_CPUS];
|
|
|
|
#ifdef CONFIG_VGA_CONSOLE
|
|
struct screen_info screen_info;
|
|
#endif
|
|
|
|
char elf_platform[ELF_PLATFORM_SIZE];
|
|
EXPORT_SYMBOL(elf_platform);
|
|
|
|
static char __initdata cmd_line[COMMAND_LINE_SIZE];
|
|
|
|
static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
|
|
|
|
/*
|
|
* Standard memory resources
|
|
*/
|
|
static struct resource mem_res[] = {
|
|
{
|
|
.name = "Kernel code",
|
|
.start = 0,
|
|
.end = 0,
|
|
.flags = IORESOURCE_SYSTEM_RAM
|
|
},
|
|
{
|
|
.name = "Kernel data",
|
|
.start = 0,
|
|
.end = 0,
|
|
.flags = IORESOURCE_SYSTEM_RAM
|
|
}
|
|
};
|
|
|
|
#define kernel_code mem_res[0]
|
|
#define kernel_data mem_res[1]
|
|
|
|
/*
|
|
* These functions re-use the assembly code in head.S, which
|
|
* already provide the required functionality.
|
|
*/
|
|
static void __init setup_processor(void)
|
|
{
|
|
printk(KERN_DEFAULT "CPU: UniCore-II [%08x] revision %d, cr=%08lx\n",
|
|
uc32_cpuid, (int)(uc32_cpuid >> 16) & 15, cr_alignment);
|
|
|
|
sprintf(init_utsname()->machine, "puv3");
|
|
sprintf(elf_platform, "ucv2");
|
|
}
|
|
|
|
/*
|
|
* cpu_init - initialise one CPU.
|
|
*
|
|
* cpu_init sets up the per-CPU stacks.
|
|
*/
|
|
void cpu_init(void)
|
|
{
|
|
unsigned int cpu = smp_processor_id();
|
|
struct stack *stk = &stacks[cpu];
|
|
|
|
/*
|
|
* setup stacks for re-entrant exception handlers
|
|
*/
|
|
__asm__ (
|
|
"mov.a asr, %1\n\t"
|
|
"add sp, %0, %2\n\t"
|
|
"mov.a asr, %3\n\t"
|
|
"add sp, %0, %4\n\t"
|
|
"mov.a asr, %5\n\t"
|
|
"add sp, %0, %6\n\t"
|
|
"mov.a asr, %7"
|
|
:
|
|
: "r" (stk),
|
|
"r" (PSR_R_BIT | PSR_I_BIT | INTR_MODE),
|
|
"I" (offsetof(struct stack, irq[0])),
|
|
"r" (PSR_R_BIT | PSR_I_BIT | ABRT_MODE),
|
|
"I" (offsetof(struct stack, abt[0])),
|
|
"r" (PSR_R_BIT | PSR_I_BIT | EXTN_MODE),
|
|
"I" (offsetof(struct stack, und[0])),
|
|
"r" (PSR_R_BIT | PSR_I_BIT | PRIV_MODE)
|
|
: "r30", "cc");
|
|
}
|
|
|
|
static int __init uc32_add_memory(unsigned long start, unsigned long size)
|
|
{
|
|
struct membank *bank = &meminfo.bank[meminfo.nr_banks];
|
|
|
|
if (meminfo.nr_banks >= NR_BANKS) {
|
|
printk(KERN_CRIT "NR_BANKS too low, "
|
|
"ignoring memory at %#lx\n", start);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Ensure that start/size are aligned to a page boundary.
|
|
* Size is appropriately rounded down, start is rounded up.
|
|
*/
|
|
size -= start & ~PAGE_MASK;
|
|
|
|
bank->start = PAGE_ALIGN(start);
|
|
bank->size = size & PAGE_MASK;
|
|
|
|
/*
|
|
* Check whether this memory region has non-zero size or
|
|
* invalid node number.
|
|
*/
|
|
if (bank->size == 0)
|
|
return -EINVAL;
|
|
|
|
meminfo.nr_banks++;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Pick out the memory size. We look for mem=size@start,
|
|
* where start and size are "size[KkMm]"
|
|
*/
|
|
static int __init early_mem(char *p)
|
|
{
|
|
static int usermem __initdata = 1;
|
|
unsigned long size, start;
|
|
char *endp;
|
|
|
|
/*
|
|
* If the user specifies memory size, we
|
|
* blow away any automatically generated
|
|
* size.
|
|
*/
|
|
if (usermem) {
|
|
usermem = 0;
|
|
meminfo.nr_banks = 0;
|
|
}
|
|
|
|
start = PHYS_OFFSET;
|
|
size = memparse(p, &endp);
|
|
if (*endp == '@')
|
|
start = memparse(endp + 1, NULL);
|
|
|
|
uc32_add_memory(start, size);
|
|
|
|
return 0;
|
|
}
|
|
early_param("mem", early_mem);
|
|
|
|
static void __init
|
|
request_standard_resources(struct meminfo *mi)
|
|
{
|
|
struct resource *res;
|
|
int i;
|
|
|
|
kernel_code.start = virt_to_phys(_stext);
|
|
kernel_code.end = virt_to_phys(_etext - 1);
|
|
kernel_data.start = virt_to_phys(_sdata);
|
|
kernel_data.end = virt_to_phys(_end - 1);
|
|
|
|
for (i = 0; i < mi->nr_banks; i++) {
|
|
if (mi->bank[i].size == 0)
|
|
continue;
|
|
|
|
res = memblock_alloc_low(sizeof(*res), SMP_CACHE_BYTES);
|
|
if (!res)
|
|
panic("%s: Failed to allocate %zu bytes align=%x\n",
|
|
__func__, sizeof(*res), SMP_CACHE_BYTES);
|
|
|
|
res->name = "System RAM";
|
|
res->start = mi->bank[i].start;
|
|
res->end = mi->bank[i].start + mi->bank[i].size - 1;
|
|
res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
|
|
|
|
request_resource(&iomem_resource, res);
|
|
|
|
if (kernel_code.start >= res->start &&
|
|
kernel_code.end <= res->end)
|
|
request_resource(res, &kernel_code);
|
|
if (kernel_data.start >= res->start &&
|
|
kernel_data.end <= res->end)
|
|
request_resource(res, &kernel_data);
|
|
}
|
|
}
|
|
|
|
static void (*init_machine)(void) __initdata;
|
|
|
|
static int __init customize_machine(void)
|
|
{
|
|
/* customizes platform devices, or adds new ones */
|
|
if (init_machine)
|
|
init_machine();
|
|
return 0;
|
|
}
|
|
arch_initcall(customize_machine);
|
|
|
|
void __init setup_arch(char **cmdline_p)
|
|
{
|
|
char *from = default_command_line;
|
|
|
|
setup_processor();
|
|
|
|
init_mm.start_code = (unsigned long) _stext;
|
|
init_mm.end_code = (unsigned long) _etext;
|
|
init_mm.end_data = (unsigned long) _edata;
|
|
init_mm.brk = (unsigned long) _end;
|
|
|
|
/* parse_early_param needs a boot_command_line */
|
|
strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
|
|
|
|
/* populate cmd_line too for later use, preserving boot_command_line */
|
|
strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
|
|
*cmdline_p = cmd_line;
|
|
|
|
parse_early_param();
|
|
|
|
uc32_memblock_init(&meminfo);
|
|
|
|
paging_init();
|
|
request_standard_resources(&meminfo);
|
|
|
|
cpu_init();
|
|
|
|
/*
|
|
* Set up various architecture-specific pointers
|
|
*/
|
|
init_machine = puv3_core_init;
|
|
|
|
#ifdef CONFIG_VT
|
|
#if defined(CONFIG_VGA_CONSOLE)
|
|
conswitchp = &vga_con;
|
|
#elif defined(CONFIG_DUMMY_CONSOLE)
|
|
conswitchp = &dummy_con;
|
|
#endif
|
|
#endif
|
|
early_trap_init();
|
|
}
|
|
|
|
static struct cpu cpuinfo_unicore;
|
|
|
|
static int __init topology_init(void)
|
|
{
|
|
int i;
|
|
|
|
for_each_possible_cpu(i)
|
|
register_cpu(&cpuinfo_unicore, i);
|
|
|
|
return 0;
|
|
}
|
|
subsys_initcall(topology_init);
|
|
|
|
#ifdef CONFIG_HAVE_PROC_CPU
|
|
static int __init proc_cpu_init(void)
|
|
{
|
|
struct proc_dir_entry *res;
|
|
|
|
res = proc_mkdir("cpu", NULL);
|
|
if (!res)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
fs_initcall(proc_cpu_init);
|
|
#endif
|
|
|
|
static int c_show(struct seq_file *m, void *v)
|
|
{
|
|
seq_printf(m, "Processor\t: UniCore-II rev %d (%s)\n",
|
|
(int)(uc32_cpuid >> 16) & 15, elf_platform);
|
|
|
|
seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
|
|
loops_per_jiffy / (500000/HZ),
|
|
(loops_per_jiffy / (5000/HZ)) % 100);
|
|
|
|
/* dump out the processor features */
|
|
seq_puts(m, "Features\t: CMOV UC-F64");
|
|
|
|
seq_printf(m, "\nCPU implementer\t: 0x%02x\n", uc32_cpuid >> 24);
|
|
seq_printf(m, "CPU architecture: 2\n");
|
|
seq_printf(m, "CPU revision\t: %d\n", (uc32_cpuid >> 16) & 15);
|
|
|
|
seq_printf(m, "Cache type\t: write-back\n"
|
|
"Cache clean\t: cp0 c5 ops\n"
|
|
"Cache lockdown\t: not support\n"
|
|
"Cache format\t: Harvard\n");
|
|
|
|
seq_puts(m, "\n");
|
|
|
|
seq_printf(m, "Hardware\t: PKUnity v3\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void *c_start(struct seq_file *m, loff_t *pos)
|
|
{
|
|
return *pos < 1 ? (void *)1 : NULL;
|
|
}
|
|
|
|
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
|
|
{
|
|
++*pos;
|
|
return NULL;
|
|
}
|
|
|
|
static void c_stop(struct seq_file *m, void *v)
|
|
{
|
|
}
|
|
|
|
const struct seq_operations cpuinfo_op = {
|
|
.start = c_start,
|
|
.next = c_next,
|
|
.stop = c_stop,
|
|
.show = c_show
|
|
};
|