19143a935SGuo Ren // SPDX-License-Identifier: GPL-2.0
29143a935SGuo Ren // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
39143a935SGuo Ren
49143a935SGuo Ren #include <linux/console.h>
59143a935SGuo Ren #include <linux/memblock.h>
69143a935SGuo Ren #include <linux/initrd.h>
79143a935SGuo Ren #include <linux/of.h>
89143a935SGuo Ren #include <linux/of_fdt.h>
99143a935SGuo Ren #include <linux/start_kernel.h>
100b1abd1fSChristoph Hellwig #include <linux/dma-map-ops.h>
119143a935SGuo Ren #include <linux/screen_info.h>
129143a935SGuo Ren #include <asm/sections.h>
139143a935SGuo Ren #include <asm/mmu_context.h>
149143a935SGuo Ren #include <asm/pgalloc.h>
159143a935SGuo Ren
169143a935SGuo Ren #ifdef CONFIG_DUMMY_CONSOLE
179143a935SGuo Ren struct screen_info screen_info = {
189143a935SGuo Ren .orig_video_lines = 30,
199143a935SGuo Ren .orig_video_cols = 80,
209143a935SGuo Ren .orig_video_mode = 0,
219143a935SGuo Ren .orig_video_ega_bx = 0,
229143a935SGuo Ren .orig_video_isVGA = 1,
239143a935SGuo Ren .orig_video_points = 8
249143a935SGuo Ren };
259143a935SGuo Ren #endif
269143a935SGuo Ren
csky_memblock_init(void)279143a935SGuo Ren static void __init csky_memblock_init(void)
289143a935SGuo Ren {
298f4693f0SMike Rapoport unsigned long lowmem_size = PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET);
308f4693f0SMike Rapoport unsigned long sseg_size = PFN_DOWN(SSEG_SIZE - PHYS_OFFSET_OFFSET);
318f4693f0SMike Rapoport unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };
329143a935SGuo Ren signed long size;
339143a935SGuo Ren
34*f54af50dSGuo Ren memblock_reserve(__pa(_start), _end - _start);
359143a935SGuo Ren
369143a935SGuo Ren early_init_fdt_reserve_self();
379143a935SGuo Ren early_init_fdt_scan_reserved_mem();
389143a935SGuo Ren
399143a935SGuo Ren memblock_dump_all();
409143a935SGuo Ren
419143a935SGuo Ren min_low_pfn = PFN_UP(memblock_start_of_DRAM());
42aefd9461SGuo Ren max_low_pfn = max_pfn = PFN_DOWN(memblock_end_of_DRAM());
439143a935SGuo Ren
449143a935SGuo Ren size = max_pfn - min_low_pfn;
459143a935SGuo Ren
468f4693f0SMike Rapoport if (size >= lowmem_size) {
478f4693f0SMike Rapoport max_low_pfn = min_low_pfn + lowmem_size;
480c8a32eeSGuo Ren #ifdef CONFIG_PAGE_OFFSET_80000000
49aefd9461SGuo Ren write_mmu_msa1(read_mmu_msa0() + SSEG_SIZE);
500c8a32eeSGuo Ren #endif
518f4693f0SMike Rapoport } else if (size > sseg_size) {
528f4693f0SMike Rapoport max_low_pfn = min_low_pfn + sseg_size;
539143a935SGuo Ren }
549143a935SGuo Ren
558f4693f0SMike Rapoport max_zone_pfn[ZONE_NORMAL] = max_low_pfn;
568f4693f0SMike Rapoport
570c8a32eeSGuo Ren mmu_init(min_low_pfn, max_low_pfn);
580c8a32eeSGuo Ren
599143a935SGuo Ren #ifdef CONFIG_HIGHMEM
608f4693f0SMike Rapoport max_zone_pfn[ZONE_HIGHMEM] = max_pfn;
619143a935SGuo Ren
62aefd9461SGuo Ren highstart_pfn = max_low_pfn;
639143a935SGuo Ren highend_pfn = max_pfn;
649143a935SGuo Ren #endif
659143a935SGuo Ren memblock_set_current_limit(PFN_PHYS(max_low_pfn));
669143a935SGuo Ren
679143a935SGuo Ren dma_contiguous_reserve(0);
689143a935SGuo Ren
698f4693f0SMike Rapoport free_area_init(max_zone_pfn);
709143a935SGuo Ren }
719143a935SGuo Ren
setup_arch(char ** cmdline_p)729143a935SGuo Ren void __init setup_arch(char **cmdline_p)
739143a935SGuo Ren {
749143a935SGuo Ren *cmdline_p = boot_command_line;
759143a935SGuo Ren
769143a935SGuo Ren console_verbose();
779143a935SGuo Ren
789143a935SGuo Ren pr_info("Phys. mem: %ldMB\n",
799143a935SGuo Ren (unsigned long) memblock_phys_mem_size()/1024/1024);
809143a935SGuo Ren
81*f54af50dSGuo Ren setup_initial_init_mm(_start, _etext, _edata, _end);
829143a935SGuo Ren
839143a935SGuo Ren parse_early_param();
849143a935SGuo Ren
859143a935SGuo Ren csky_memblock_init();
869143a935SGuo Ren
879143a935SGuo Ren unflatten_and_copy_device_tree();
889143a935SGuo Ren
899143a935SGuo Ren #ifdef CONFIG_SMP
909143a935SGuo Ren setup_smp();
919143a935SGuo Ren #endif
929143a935SGuo Ren
939143a935SGuo Ren sparse_init();
949143a935SGuo Ren
95f136008fSGuo Ren fixaddr_init();
96f136008fSGuo Ren
979143a935SGuo Ren #ifdef CONFIG_HIGHMEM
989143a935SGuo Ren kmap_init();
999143a935SGuo Ren #endif
1009143a935SGuo Ren }
1019143a935SGuo Ren
102683fafebSGuo Ren unsigned long va_pa_offset;
103683fafebSGuo Ren EXPORT_SYMBOL(va_pa_offset);
104f62e3162SGuo Ren
read_mmu_msa(void)1050c8a32eeSGuo Ren static inline unsigned long read_mmu_msa(void)
1060c8a32eeSGuo Ren {
1070c8a32eeSGuo Ren #ifdef CONFIG_PAGE_OFFSET_80000000
1080c8a32eeSGuo Ren return read_mmu_msa0();
1090c8a32eeSGuo Ren #endif
1100c8a32eeSGuo Ren
1110c8a32eeSGuo Ren #ifdef CONFIG_PAGE_OFFSET_A0000000
1120c8a32eeSGuo Ren return read_mmu_msa1();
1130c8a32eeSGuo Ren #endif
1140c8a32eeSGuo Ren }
1150c8a32eeSGuo Ren
csky_start(unsigned int unused,void * dtb_start)116205353faSGuo Ren asmlinkage __visible void __init csky_start(unsigned int unused,
117205353faSGuo Ren void *dtb_start)
1189143a935SGuo Ren {
1199143a935SGuo Ren /* Clean up bss section */
1209143a935SGuo Ren memset(__bss_start, 0, __bss_stop - __bss_start);
1219143a935SGuo Ren
1220c8a32eeSGuo Ren va_pa_offset = read_mmu_msa() & ~(SSEG_SIZE - 1);
123f62e3162SGuo Ren
1249143a935SGuo Ren pre_trap_init();
1259143a935SGuo Ren
126205353faSGuo Ren if (dtb_start == NULL)
1279143a935SGuo Ren early_init_dt_scan(__dtb_start);
1289143a935SGuo Ren else
129205353faSGuo Ren early_init_dt_scan(dtb_start);
1309143a935SGuo Ren
1319143a935SGuo Ren start_kernel();
1329143a935SGuo Ren
1339143a935SGuo Ren asm volatile("br .\n");
1349143a935SGuo Ren }
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