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