linux-stable/arch/h8300/kernel/setup.c
Mike Rapoport 80c4574417 h8300, nds32, openrisc: simplify detection of memory extents
Instead of traversing memblock.memory regions to find memory_start and
memory_end, simply query memblock_{start,end}_of_DRAM().

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Stafford Horne <shorne@gmail.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Baoquan He <bhe@redhat.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Daniel Axtens <dja@axtens.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Emil Renner Berthing <kernel@esmil.dk>
Cc: Hari Bathini <hbathini@linux.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Link: https://lkml.kernel.org/r/20200818151634.14343-6-rppt@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-10-13 18:38:35 -07:00

218 lines
4.5 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* linux/arch/h8300/kernel/setup.c
*
* Copyright (C) 2001-2014 Yoshinori Sato <ysato@users.sourceforge.jp>
*/
/*
* This file handles the architecture-dependent parts of system setup
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/console.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/of_address.h>
#include <linux/clk-provider.h>
#include <linux/memblock.h>
#include <linux/screen_info.h>
#include <linux/clocksource.h>
#include <asm/setup.h>
#include <asm/irq.h>
#include <asm/sections.h>
#include <asm/page.h>
#if defined(CONFIG_CPU_H8300H)
#define CPU "H8/300H"
#elif defined(CONFIG_CPU_H8S)
#define CPU "H8S"
#else
#define CPU "Unknown"
#endif
unsigned long memory_start;
unsigned long memory_end;
EXPORT_SYMBOL(memory_end);
static unsigned long freq;
extern char __dtb_start[];
#ifdef CONFIG_VT
struct screen_info screen_info;
#endif
char __initdata command_line[COMMAND_LINE_SIZE];
void sim_console_register(void);
void __init h8300_fdt_init(void *fdt, char *bootargs)
{
if (!fdt)
fdt = __dtb_start;
else
strcpy(command_line, bootargs);
early_init_dt_scan(fdt);
memblock_allow_resize();
}
static void __init bootmem_init(void)
{
struct memblock_region *region;
memory_end = memory_start = 0;
/* Find main memory where is the kernel */
memory_start = memblock_start_of_DRAM();
memory_end = memblock_end_of_DRAM();
if (!memory_end)
panic("No memory!");
/* setup bootmem globals (we use no_bootmem, but mm still depends on this) */
min_low_pfn = PFN_UP(memory_start);
max_low_pfn = PFN_DOWN(memory_end);
max_pfn = max_low_pfn;
memblock_reserve(__pa(_stext), _end - _stext);
early_init_fdt_reserve_self();
early_init_fdt_scan_reserved_mem();
memblock_dump_all();
}
void __init setup_arch(char **cmdline_p)
{
unflatten_and_copy_device_tree();
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) 0;
pr_notice("\r\n\nuClinux " CPU "\n");
pr_notice("Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n");
if (*command_line)
strcpy(boot_command_line, command_line);
*cmdline_p = boot_command_line;
parse_early_param();
bootmem_init();
/*
* get kmalloc into gear
*/
paging_init();
}
/*
* Get CPU information for use by the procfs.
*/
static int show_cpuinfo(struct seq_file *m, void *v)
{
char *cpu;
cpu = CPU;
seq_printf(m, "CPU:\t\t%s\n"
"Clock:\t\t%lu.%1luMHz\n"
"BogoMips:\t%lu.%02lu\n"
"Calibration:\t%lu loops\n",
cpu,
freq/1000, freq%1000,
(loops_per_jiffy*HZ)/500000,
((loops_per_jiffy*HZ)/5000)%100,
(loops_per_jiffy*HZ));
return 0;
}
static void *c_start(struct seq_file *m, loff_t *pos)
{
return *pos < num_possible_cpus() ?
((void *) 0x12345678) : NULL;
}
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
++*pos;
return c_start(m, pos);
}
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 = show_cpuinfo,
};
#if defined(CONFIG_CPU_H8300H)
#define get_wait(base, addr) ({ \
int baddr; \
baddr = ((addr) / 0x200000 * 2); \
w *= (readw((base) + 2) & (3 << baddr)) + 1; \
})
#endif
#if defined(CONFIG_CPU_H8S)
#define get_wait(base, addr) ({ \
int baddr; \
baddr = ((addr) / 0x200000 * 16); \
w *= (readl((base) + 2) & (7 << baddr)) + 1; \
})
#endif
static __init int access_timing(void)
{
struct device_node *bsc;
void __iomem *base;
unsigned long addr = (unsigned long)&__delay;
int bit = 1 << (addr / 0x200000);
int w;
bsc = of_find_compatible_node(NULL, NULL, "renesas,h8300-bsc");
base = of_iomap(bsc, 0);
w = (readb(base + 0) & bit)?2:1;
if (readb(base + 1) & bit)
w *= get_wait(base, addr);
else
w *= 2;
return w * 3 / 2;
}
void __init calibrate_delay(void)
{
struct device_node *cpu;
int freq;
cpu = of_find_compatible_node(NULL, NULL, "renesas,h8300");
of_property_read_s32(cpu, "clock-frequency", &freq);
loops_per_jiffy = freq / HZ / (access_timing() * 2);
pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
loops_per_jiffy / (500000 / HZ),
(loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);
}
void __init time_init(void)
{
of_clk_init(NULL);
timer_probe();
}