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Diffstat (limited to '')
| -rw-r--r-- | arch/h8300/kernel/setup.c | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/arch/h8300/kernel/setup.c b/arch/h8300/kernel/setup.c new file mode 100644 index 000000000..0281f92ee --- /dev/null +++ b/arch/h8300/kernel/setup.c @@ -0,0 +1,218 @@ +// 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(); +} |