diff options
Diffstat (limited to 'arch/csky/kernel/setup.c')
-rw-r--r-- | arch/csky/kernel/setup.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/arch/csky/kernel/setup.c b/arch/csky/kernel/setup.c new file mode 100644 index 0000000000..106fbf0b6f --- /dev/null +++ b/arch/csky/kernel/setup.c @@ -0,0 +1,134 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#include <linux/console.h> +#include <linux/memblock.h> +#include <linux/initrd.h> +#include <linux/of.h> +#include <linux/of_fdt.h> +#include <linux/start_kernel.h> +#include <linux/dma-map-ops.h> +#include <linux/screen_info.h> +#include <asm/sections.h> +#include <asm/mmu_context.h> +#include <asm/pgalloc.h> + +#ifdef CONFIG_DUMMY_CONSOLE +struct screen_info screen_info = { + .orig_video_lines = 30, + .orig_video_cols = 80, + .orig_video_mode = 0, + .orig_video_ega_bx = 0, + .orig_video_isVGA = 1, + .orig_video_points = 8 +}; +#endif + +static void __init csky_memblock_init(void) +{ + unsigned long lowmem_size = PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET); + unsigned long sseg_size = PFN_DOWN(SSEG_SIZE - PHYS_OFFSET_OFFSET); + unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 }; + signed long size; + + memblock_reserve(__pa(_start), _end - _start); + + early_init_fdt_reserve_self(); + early_init_fdt_scan_reserved_mem(); + + memblock_dump_all(); + + min_low_pfn = PFN_UP(memblock_start_of_DRAM()); + max_low_pfn = max_pfn = PFN_DOWN(memblock_end_of_DRAM()); + + size = max_pfn - min_low_pfn; + + if (size >= lowmem_size) { + max_low_pfn = min_low_pfn + lowmem_size; +#ifdef CONFIG_PAGE_OFFSET_80000000 + write_mmu_msa1(read_mmu_msa0() + SSEG_SIZE); +#endif + } else if (size > sseg_size) { + max_low_pfn = min_low_pfn + sseg_size; + } + + max_zone_pfn[ZONE_NORMAL] = max_low_pfn; + + mmu_init(min_low_pfn, max_low_pfn); + +#ifdef CONFIG_HIGHMEM + max_zone_pfn[ZONE_HIGHMEM] = max_pfn; + + highstart_pfn = max_low_pfn; + highend_pfn = max_pfn; +#endif + memblock_set_current_limit(PFN_PHYS(max_low_pfn)); + + dma_contiguous_reserve(0); + + free_area_init(max_zone_pfn); +} + +void __init setup_arch(char **cmdline_p) +{ + *cmdline_p = boot_command_line; + + console_verbose(); + + pr_info("Phys. mem: %ldMB\n", + (unsigned long) memblock_phys_mem_size()/1024/1024); + + setup_initial_init_mm(_start, _etext, _edata, _end); + + parse_early_param(); + + csky_memblock_init(); + + unflatten_and_copy_device_tree(); + +#ifdef CONFIG_SMP + setup_smp(); +#endif + + sparse_init(); + + fixaddr_init(); + +#ifdef CONFIG_HIGHMEM + kmap_init(); +#endif +} + +unsigned long va_pa_offset; +EXPORT_SYMBOL(va_pa_offset); + +static inline unsigned long read_mmu_msa(void) +{ +#ifdef CONFIG_PAGE_OFFSET_80000000 + return read_mmu_msa0(); +#endif + +#ifdef CONFIG_PAGE_OFFSET_A0000000 + return read_mmu_msa1(); +#endif +} + +asmlinkage __visible void __init csky_start(unsigned int unused, + void *dtb_start) +{ + /* Clean up bss section */ + memset(__bss_start, 0, __bss_stop - __bss_start); + + va_pa_offset = read_mmu_msa() & ~(SSEG_SIZE - 1); + + pre_trap_init(); + + if (dtb_start == NULL) + early_init_dt_scan(__dtb_start); + else + early_init_dt_scan(dtb_start); + + start_kernel(); + + asm volatile("br .\n"); +} |