score: Add support for Sunplus S+core architecture

This is the complete set of new arch Score's files for linux.
Score instruction set support 16bits, 32bits and 64bits instruction,
Score SOC had been used in game machine and LCD TV.

Signed-off-by: Chen Liqin <liqin.chen@sunplusct.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 173 insertions, 0 deletions

diff --git a/arch/score/mm/init.c b/arch/score/mm/init.c
new file mode 100644
index 00000000000..7780eecc5a4
--- /dev/null
+++ b/arch/score/mm/init.c
@@ -0,0 +1,173 @@
+/*
+ * arch/score/mm/init.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ *  Lennox Wu <lennox.wu@sunplusct.com>
+ *  Chen Liqin <liqin.chen@sunplusct.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/errno.h>
+#include <linux/bootmem.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/pagemap.h>
+#include <linux/proc_fs.h>
+#include <linux/sched.h>
+#include <asm-generic/sections.h>
+
+#include <asm/tlb.h>
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+
+/*
+ * We have up to 8 empty zeroed pages so we can map one of the right colour
+ * when needed.
+ */
+unsigned long zero_page_mask;
+unsigned long empty_zero_page;
+EXPORT_SYMBOL_GPL(empty_zero_page);
+
+static struct kcore_list kcore_mem, kcore_vmalloc;
+
+unsigned long setup_zero_pages(void)
+{
+	unsigned int order = 0;
+	unsigned long size;
+	struct page *page;
+
+	empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
+	if (!empty_zero_page)
+		panic("Oh boy, that early out of memory?");
+
+	page = virt_to_page((void *) empty_zero_page);
+	split_page(page, order);
+	while (page < virt_to_page((void *) (empty_zero_page +
+					     (PAGE_SIZE << order)))) {
+		SetPageReserved(page);
+		page++;
+	}
+
+	size = PAGE_SIZE << order;
+	zero_page_mask = (size - 1) & PAGE_MASK;
+
+	return 1UL << order;
+}
+
+#ifndef CONFIG_NEED_MULTIPLE_NODES
+static int __init page_is_ram(unsigned long pagenr)
+{
+	if (pagenr >= min_low_pfn && pagenr < max_low_pfn)
+		return 1;
+	else
+		return 0;
+}
+
+void __init paging_init(void)
+{
+	unsigned long max_zone_pfns[MAX_NR_ZONES];
+	unsigned long lastpfn;
+
+	pagetable_init();
+	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
+	lastpfn = max_low_pfn;
+	free_area_init_nodes(max_zone_pfns);
+}
+
+void __init mem_init(void)
+{
+	unsigned long codesize, reservedpages, datasize, initsize;
+	unsigned long tmp, ram = 0;
+
+	max_mapnr = max_low_pfn;
+	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
+	totalram_pages += free_all_bootmem();
+	totalram_pages -= setup_zero_pages();	/* Setup zeroed pages. */
+	reservedpages = 0;
+
+	for (tmp = 0; tmp < max_low_pfn; tmp++)
+		if (page_is_ram(tmp)) {
+			ram++;
+			if (PageReserved(pfn_to_page(tmp)))
+				reservedpages++;
+		}
+
+	num_physpages = ram;
+	codesize = (unsigned long) &_etext - (unsigned long) &_text;
+	datasize = (unsigned long) &_edata - (unsigned long) &_etext;
+	initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
+
+	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
+	kclist_add(&kcore_vmalloc, (void *) VMALLOC_START,
+			VMALLOC_END - VMALLOC_START);
+
+	printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
+			"%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
+			(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
+			ram << (PAGE_SHIFT-10), codesize >> 10,
+			reservedpages << (PAGE_SHIFT-10), datasize >> 10,
+			initsize >> 10,
+			(unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
+}
+#endif /* !CONFIG_NEED_MULTIPLE_NODES */
+
+void free_init_pages(const char *what, unsigned long begin, unsigned long end)
+{
+	unsigned long pfn;
+
+	for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
+		struct page *page = pfn_to_page(pfn);
+		void *addr = phys_to_virt(PFN_PHYS(pfn));
+
+		ClearPageReserved(page);
+		init_page_count(page);
+		memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
+		__free_page(page);
+		totalram_pages++;
+	}
+	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+	free_init_pages("initrd memory",
+	virt_to_phys((void *) start),
+	virt_to_phys((void *) end));
+}
+#endif
+
+void __init_refok free_initmem(void)
+{
+	free_init_pages("unused kernel memory",
+	    (unsigned long)__init_begin, (unsigned long)__init_end);
+}
+
+unsigned long pgd_current;
+
+#define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
+
+/*
+ * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
+ * are constants.  So we use the variants from asm-offset.h until that gcc
+ * will officially be retired.
+ */
+pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);