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linux-sg2042/arch/nds32/kernel/setup.c

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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2005-2017 Andes Technology Corporation
#include <linux/cpu.h>
#include <linux/bootmem.h>
#include <linux/seq_file.h>
#include <linux/memblock.h>
#include <linux/console.h>
#include <linux/screen_info.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/of_fdt.h>
#include <linux/of_platform.h>
#include <asm/setup.h>
#include <asm/sections.h>
#include <asm/proc-fns.h>
#include <asm/cache_info.h>
#include <asm/elf.h>
#include <nds32_intrinsic.h>
#define HWCAP_MFUSR_PC 0x000001
#define HWCAP_EXT 0x000002
#define HWCAP_EXT2 0x000004
#define HWCAP_FPU 0x000008
#define HWCAP_AUDIO 0x000010
#define HWCAP_BASE16 0x000020
#define HWCAP_STRING 0x000040
#define HWCAP_REDUCED_REGS 0x000080
#define HWCAP_VIDEO 0x000100
#define HWCAP_ENCRYPT 0x000200
#define HWCAP_EDM 0x000400
#define HWCAP_LMDMA 0x000800
#define HWCAP_PFM 0x001000
#define HWCAP_HSMP 0x002000
#define HWCAP_TRACE 0x004000
#define HWCAP_DIV 0x008000
#define HWCAP_MAC 0x010000
#define HWCAP_L2C 0x020000
#define HWCAP_FPU_DP 0x040000
#define HWCAP_V2 0x080000
#define HWCAP_DX_REGS 0x100000
unsigned long cpu_id, cpu_rev, cpu_cfgid;
char cpu_series;
char *endianness = NULL;
unsigned int __atags_pointer __initdata;
unsigned int elf_hwcap;
EXPORT_SYMBOL(elf_hwcap);
/*
* The following string table, must sync with HWCAP_xx bitmask,
* which is defined in <asm/procinfo.h>
*/
static const char *hwcap_str[] = {
"mfusr_pc",
"perf1",
"perf2",
"fpu",
"audio",
"16b",
"string",
"reduced_regs",
"video",
"encrypt",
"edm",
"lmdma",
"pfm",
"hsmp",
"trace",
"div",
"mac",
"l2c",
"dx_regs",
"v2",
NULL,
};
#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
#define WRITE_METHOD "write through"
#else
#define WRITE_METHOD "write back"
#endif
struct cache_info L1_cache_info[2];
static void __init dump_cpu_info(int cpu)
{
int i, p = 0;
char str[sizeof(hwcap_str) + 16];
for (i = 0; hwcap_str[i]; i++) {
if (elf_hwcap & (1 << i)) {
sprintf(str + p, "%s ", hwcap_str[i]);
p += strlen(hwcap_str[i]) + 1;
}
}
pr_info("CPU%d Features: %s\n", cpu, str);
L1_cache_info[ICACHE].ways = CACHE_WAY(ICACHE);
L1_cache_info[ICACHE].line_size = CACHE_LINE_SIZE(ICACHE);
L1_cache_info[ICACHE].sets = CACHE_SET(ICACHE);
L1_cache_info[ICACHE].size =
L1_cache_info[ICACHE].ways * L1_cache_info[ICACHE].line_size *
L1_cache_info[ICACHE].sets / 1024;
pr_info("L1I:%dKB/%dS/%dW/%dB\n", L1_cache_info[ICACHE].size,
L1_cache_info[ICACHE].sets, L1_cache_info[ICACHE].ways,
L1_cache_info[ICACHE].line_size);
L1_cache_info[DCACHE].ways = CACHE_WAY(DCACHE);
L1_cache_info[DCACHE].line_size = CACHE_LINE_SIZE(DCACHE);
L1_cache_info[DCACHE].sets = CACHE_SET(DCACHE);
L1_cache_info[DCACHE].size =
L1_cache_info[DCACHE].ways * L1_cache_info[DCACHE].line_size *
L1_cache_info[DCACHE].sets / 1024;
pr_info("L1D:%dKB/%dS/%dW/%dB\n", L1_cache_info[DCACHE].size,
L1_cache_info[DCACHE].sets, L1_cache_info[DCACHE].ways,
L1_cache_info[DCACHE].line_size);
pr_info("L1 D-Cache is %s\n", WRITE_METHOD);
if (L1_cache_info[DCACHE].size != L1_CACHE_BYTES)
pr_crit
("The cache line size(%d) of this processor is not the same as L1_CACHE_BYTES(%d).\n",
L1_cache_info[DCACHE].size, L1_CACHE_BYTES);
#ifdef CONFIG_CPU_CACHE_ALIASING
{
int aliasing_num;
aliasing_num =
L1_cache_info[ICACHE].size * 1024 / PAGE_SIZE /
L1_cache_info[ICACHE].ways;
L1_cache_info[ICACHE].aliasing_num = aliasing_num;
L1_cache_info[ICACHE].aliasing_mask =
(aliasing_num - 1) << PAGE_SHIFT;
aliasing_num =
L1_cache_info[DCACHE].size * 1024 / PAGE_SIZE /
L1_cache_info[DCACHE].ways;
L1_cache_info[DCACHE].aliasing_num = aliasing_num;
L1_cache_info[DCACHE].aliasing_mask =
(aliasing_num - 1) << PAGE_SHIFT;
}
#endif
}
static void __init setup_cpuinfo(void)
{
unsigned long tmp = 0, cpu_name;
cpu_dcache_inval_all();
cpu_icache_inval_all();
__nds32__isb();
cpu_id = (__nds32__mfsr(NDS32_SR_CPU_VER) & CPU_VER_mskCPUID) >> CPU_VER_offCPUID;
cpu_name = ((cpu_id) & 0xf0) >> 4;
cpu_series = cpu_name ? cpu_name - 10 + 'A' : 'N';
cpu_id = cpu_id & 0xf;
cpu_rev = (__nds32__mfsr(NDS32_SR_CPU_VER) & CPU_VER_mskREV) >> CPU_VER_offREV;
cpu_cfgid = (__nds32__mfsr(NDS32_SR_CPU_VER) & CPU_VER_mskCFGID) >> CPU_VER_offCFGID;
pr_info("CPU:%c%ld, CPU_VER 0x%08x(id %lu, rev %lu, cfg %lu)\n",
cpu_series, cpu_id, __nds32__mfsr(NDS32_SR_CPU_VER), cpu_id, cpu_rev, cpu_cfgid);
elf_hwcap |= HWCAP_MFUSR_PC;
if (((__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskBASEV) >> MSC_CFG_offBASEV) == 0) {
if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskDIV)
elf_hwcap |= HWCAP_DIV;
if ((__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskMAC)
|| (cpu_id == 12 && cpu_rev < 4))
elf_hwcap |= HWCAP_MAC;
} else {
elf_hwcap |= HWCAP_V2;
elf_hwcap |= HWCAP_DIV;
elf_hwcap |= HWCAP_MAC;
}
if (cpu_cfgid & 0x0001)
elf_hwcap |= HWCAP_EXT;
if (cpu_cfgid & 0x0002)
elf_hwcap |= HWCAP_BASE16;
if (cpu_cfgid & 0x0004)
elf_hwcap |= HWCAP_EXT2;
if (cpu_cfgid & 0x0008)
elf_hwcap |= HWCAP_FPU;
if (cpu_cfgid & 0x0010)
elf_hwcap |= HWCAP_STRING;
if (__nds32__mfsr(NDS32_SR_MMU_CFG) & MMU_CFG_mskDE)
endianness = "MSB";
else
endianness = "LSB";
if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskEDM)
elf_hwcap |= HWCAP_EDM;
if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskLMDMA)
elf_hwcap |= HWCAP_LMDMA;
if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskPFM)
elf_hwcap |= HWCAP_PFM;
if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskHSMP)
elf_hwcap |= HWCAP_HSMP;
if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskTRACE)
elf_hwcap |= HWCAP_TRACE;
if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskAUDIO)
elf_hwcap |= HWCAP_AUDIO;
if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskL2C)
elf_hwcap |= HWCAP_L2C;
tmp = __nds32__mfsr(NDS32_SR_CACHE_CTL);
if (!IS_ENABLED(CONFIG_CPU_DCACHE_DISABLE))
tmp |= CACHE_CTL_mskDC_EN;
if (!IS_ENABLED(CONFIG_CPU_ICACHE_DISABLE))
tmp |= CACHE_CTL_mskIC_EN;
__nds32__mtsr_isb(tmp, NDS32_SR_CACHE_CTL);
dump_cpu_info(smp_processor_id());
}
static void __init setup_memory(void)
{
unsigned long ram_start_pfn;
unsigned long free_ram_start_pfn;
phys_addr_t memory_start, memory_end;
struct memblock_region *region;
memory_end = memory_start = 0;
/* Find main memory where is the kernel */
for_each_memblock(memory, region) {
memory_start = region->base;
memory_end = region->base + region->size;
pr_info("%s: Memory: 0x%x-0x%x\n", __func__,
memory_start, memory_end);
}
if (!memory_end) {
panic("No memory!");
}
ram_start_pfn = PFN_UP(memblock_start_of_DRAM());
/* free_ram_start_pfn is first page after kernel */
free_ram_start_pfn = PFN_UP(__pa(&_end));
max_pfn = PFN_DOWN(memblock_end_of_DRAM());
/* it could update max_pfn */
if (max_pfn - ram_start_pfn <= MAXMEM_PFN)
max_low_pfn = max_pfn;
else {
max_low_pfn = MAXMEM_PFN + ram_start_pfn;
if (!IS_ENABLED(CONFIG_HIGHMEM))
max_pfn = MAXMEM_PFN + ram_start_pfn;
}
/* high_memory is related with VMALLOC */
high_memory = (void *)__va(max_low_pfn * PAGE_SIZE);
min_low_pfn = free_ram_start_pfn;
/*
* initialize the boot-time allocator (with low memory only).
*
* This makes the memory from the end of the kernel to the end of
* RAM usable.
*/
memblock_set_bottom_up(true);
memblock_reserve(PFN_PHYS(ram_start_pfn), PFN_PHYS(free_ram_start_pfn - ram_start_pfn));
early_init_fdt_reserve_self();
early_init_fdt_scan_reserved_mem();
memblock_dump_all();
}
void __init setup_arch(char **cmdline_p)
{
early_init_devtree( __dtb_start);
setup_cpuinfo();
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;
/* setup bootmem allocator */
setup_memory();
/* paging_init() sets up the MMU and marks all pages as reserved */
paging_init();
/* use generic way to parse */
parse_early_param();
unflatten_and_copy_device_tree();
if(IS_ENABLED(CONFIG_VT)) {
if(IS_ENABLED(CONFIG_DUMMY_CONSOLE))
conswitchp = &dummy_con;
}
*cmdline_p = boot_command_line;
early_trap_init();
}
static int c_show(struct seq_file *m, void *v)
{
int i;
seq_printf(m, "Processor\t: %c%ld (id %lu, rev %lu, cfg %lu)\n",
cpu_series, cpu_id, cpu_id, cpu_rev, cpu_cfgid);
seq_printf(m, "L1I\t\t: %luKB/%luS/%luW/%luB\n",
CACHE_SET(ICACHE) * CACHE_WAY(ICACHE) *
CACHE_LINE_SIZE(ICACHE) / 1024, CACHE_SET(ICACHE),
CACHE_WAY(ICACHE), CACHE_LINE_SIZE(ICACHE));
seq_printf(m, "L1D\t\t: %luKB/%luS/%luW/%luB\n",
CACHE_SET(DCACHE) * CACHE_WAY(DCACHE) *
CACHE_LINE_SIZE(DCACHE) / 1024, CACHE_SET(DCACHE),
CACHE_WAY(DCACHE), CACHE_LINE_SIZE(DCACHE));
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: ");
for (i = 0; hwcap_str[i]; i++)
if (elf_hwcap & (1 << i))
seq_printf(m, "%s ", hwcap_str[i]);
seq_puts(m, "\n\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)
{
}
struct seq_operations cpuinfo_op = {
.start = c_start,
.next = c_next,
.stop = c_stop,
.show = c_show
};
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