// 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/mm.h>
#include <linux/fs.h>
#include <linux/console.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/bootmem.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/pgtable.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 */
        for_each_memblock(memory, region) {
                memory_start = region->base;
                memory_end = region->base + region->size;
        }

        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(memblock_end_of_DRAM());
        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();
}