From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:49:45 +0200
Subject: Adding upstream version 6.1.76.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 arch/csky/kernel/setup.c | 134 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 arch/csky/kernel/setup.c

(limited to 'arch/csky/kernel/setup.c')

diff --git a/arch/csky/kernel/setup.c b/arch/csky/kernel/setup.c
new file mode 100644
index 000000000..106fbf0b6
--- /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");
+}
-- 
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