+++ /dev/null
-From 2bef1f8ce148cce9e782f75f9537767c1d8c0eea Mon Sep 17 00:00:00 2001
-From: Kurt Mahan <kmahan@freescale.com>
-Date: Wed, 31 Oct 2007 16:58:27 -0600
-Subject: [PATCH] Core Coldfire/MCF5445x arch/mm changes.
-
-LTIBName: mcfv4e-arch-mm-mods-1
-Signed-off-by: Kurt Mahan <kmahan@freescale.com>
----
- arch/m68k/mm/Makefile | 1 +
- arch/m68k/mm/cache.c | 41 ++++++++
- arch/m68k/mm/cf-mmu.c | 251 +++++++++++++++++++++++++++++++++++++++++++++++++
- arch/m68k/mm/hwtest.c | 2 +
- arch/m68k/mm/init.c | 3 +-
- arch/m68k/mm/kmap.c | 13 +++
- arch/m68k/mm/memory.c | 66 +++++++++++++-
- 7 files changed, 373 insertions(+), 4 deletions(-)
- create mode 100644 arch/m68k/mm/cf-mmu.c
-
---- a/arch/m68k/mm/Makefile
-+++ b/arch/m68k/mm/Makefile
-@@ -6,3 +6,4 @@ obj-y := cache.o init.o fault.o hwtest.
-
- obj-$(CONFIG_MMU_MOTOROLA) += kmap.o memory.o motorola.o
- obj-$(CONFIG_MMU_SUN3) += sun3kmap.o sun3mmu.o
-+obj-$(CONFIG_MMU_CFV4E) += cf-mmu.o kmap.o memory.o
---- a/arch/m68k/mm/cache.c
-+++ b/arch/m68k/mm/cache.c
-@@ -10,7 +10,11 @@
- #include <asm/pgalloc.h>
- #include <asm/traps.h>
-
-+#ifdef CONFIG_COLDFIRE
-+#include <asm/cfcache.h>
-+#endif /* CONFIG_COLDFIRE */
-
-+#ifndef CONFIG_COLDFIRE
- static unsigned long virt_to_phys_slow(unsigned long vaddr)
- {
- if (CPU_IS_060) {
-@@ -69,11 +73,45 @@ static unsigned long virt_to_phys_slow(u
- }
- return 0;
- }
-+#endif /* CONFIG_COLDFIRE */
-+
-
- /* Push n pages at kernel virtual address and clear the icache */
- /* RZ: use cpush %bc instead of cpush %dc, cinv %ic */
- void flush_icache_range(unsigned long address, unsigned long endaddr)
- {
-+#ifdef CONFIG_COLDFIRE
-+ unsigned long set;
-+ unsigned long start_set;
-+ unsigned long end_set;
-+
-+ start_set = address & _ICACHE_SET_MASK;
-+ end_set = endaddr & _ICACHE_SET_MASK;
-+
-+ if (start_set > end_set) {
-+ /* from the begining to the lowest address */
-+ for (set = 0; set <= end_set; set += (0x10 - 3))
-+ asm volatile ("cpushl %%ic,(%0)\n"
-+ "\taddq%.l #1,%0\n"
-+ "\tcpushl %%ic,(%0)\n"
-+ "\taddq%.l #1,%0\n"
-+ "\tcpushl %%ic,(%0)\n"
-+ "\taddq%.l #1,%0\n"
-+ "\tcpushl %%ic,(%0)" : : "a" (set));
-+
-+ /* next loop will finish the cache ie pass the hole */
-+ end_set = LAST_ICACHE_ADDR;
-+ }
-+ for (set = start_set; set <= end_set; set += (0x10 - 3))
-+ asm volatile ("cpushl %%ic,(%0)\n"
-+ "\taddq%.l #1,%0\n"
-+ "\tcpushl %%ic,(%0)\n"
-+ "\taddq%.l #1,%0\n"
-+ "\tcpushl %%ic,(%0)\n"
-+ "\taddq%.l #1,%0\n"
-+ "\tcpushl %%ic,(%0)" : : "a" (set));
-+
-+#else /* !CONFIG_COLDFIRE */
-
- if (CPU_IS_040_OR_060) {
- address &= PAGE_MASK;
-@@ -94,9 +132,11 @@ void flush_icache_range(unsigned long ad
- : "=&d" (tmp)
- : "di" (FLUSH_I));
- }
-+#endif /* CONFIG_COLDFIRE */
- }
- EXPORT_SYMBOL(flush_icache_range);
-
-+#ifndef CONFIG_COLDFIRE
- void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
- unsigned long addr, int len)
- {
-@@ -115,4 +155,5 @@ void flush_icache_user_range(struct vm_a
- : "di" (FLUSH_I));
- }
- }
-+#endif /* CONFIG_COLDFIRE */
-
---- /dev/null
-+++ b/arch/m68k/mm/cf-mmu.c
-@@ -0,0 +1,251 @@
-+/*
-+ * linux/arch/m68k/mm/cf-mmu.c
-+ *
-+ * Based upon linux/arch/m68k/mm/sun3mmu.c
-+ * Based upon linux/arch/ppc/mm/mmu_context.c
-+ *
-+ * Implementations of mm routines specific to the Coldfire MMU.
-+ *
-+ * Copyright (c) 2008 Freescale Semiconductor, Inc.
-+ */
-+
-+#include <linux/signal.h>
-+#include <linux/sched.h>
-+#include <linux/mm.h>
-+#include <linux/swap.h>
-+#include <linux/kernel.h>
-+#include <linux/string.h>
-+#include <linux/types.h>
-+#include <linux/init.h>
-+#ifdef CONFIG_BLK_DEV_RAM
-+#include <linux/blkdev.h>
-+#endif
-+#include <linux/bootmem.h>
-+
-+#include <asm/setup.h>
-+#include <asm/uaccess.h>
-+#include <asm/page.h>
-+#include <asm/pgtable.h>
-+#include <asm/system.h>
-+#include <asm/machdep.h>
-+#include <asm/io.h>
-+#include <asm/mmu_context.h>
-+#include <asm/cf_pgalloc.h>
-+
-+#include <asm/coldfire.h>
-+#include <asm/tlbflush.h>
-+
-+mm_context_t next_mmu_context;
-+unsigned long context_map[LAST_CONTEXT / BITS_PER_LONG + 1];
-+
-+atomic_t nr_free_contexts;
-+struct mm_struct *context_mm[LAST_CONTEXT+1];
-+void steal_context(void);
-+
-+
-+const char bad_pmd_string[] = "Bad pmd in pte_alloc: %08lx\n";
-+
-+extern unsigned long empty_bad_page_table;
-+extern unsigned long empty_bad_page;
-+extern unsigned long num_pages;
-+
-+extern char __init_begin, __init_end;
-+
-+void free_initmem(void)
-+{
-+ unsigned long addr;
-+ unsigned long start = (unsigned long)&__init_begin;
-+ unsigned long end = (unsigned long)&__init_end;
-+
-+ printk(KERN_INFO "free_initmem: __init_begin = 0x%lx __init_end = 0x%lx\n", start, end);
-+
-+ addr = (unsigned long)&__init_begin;
-+ for (; addr < (unsigned long)&__init_end; addr += PAGE_SIZE) {
-+ /* not currently used */
-+ virt_to_page(addr)->flags &= ~(1 << PG_reserved);
-+ init_page_count(virt_to_page(addr));
-+ free_page(addr);
-+ totalram_pages++;
-+ }
-+}
-+
-+/* Coldfire paging_init derived from sun3 */
-+void __init paging_init(void)
-+{
-+ pgd_t * pg_dir;
-+ pte_t * pg_table;
-+ int i;
-+ unsigned long address;
-+ unsigned long next_pgtable;
-+ unsigned long bootmem_end;
-+ unsigned long zones_size[MAX_NR_ZONES];
-+ unsigned long size;
-+ enum zone_type zone;
-+
-+ empty_zero_page = (void *)alloc_bootmem_pages(PAGE_SIZE);
-+ memset((void *)empty_zero_page, 0, PAGE_SIZE);
-+
-+ pg_dir = swapper_pg_dir;
-+ memset(swapper_pg_dir, 0, sizeof (swapper_pg_dir));
-+
-+ size = num_pages * sizeof(pte_t);
-+ size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1);
-+ next_pgtable = (unsigned long)alloc_bootmem_pages(size);
-+
-+ bootmem_end = (next_pgtable + size + PAGE_SIZE) & PAGE_MASK;
-+ pg_dir += PAGE_OFFSET >> PGDIR_SHIFT;
-+
-+ address = PAGE_OFFSET;
-+ while (address < (unsigned long)high_memory)
-+ {
-+ pg_table = (pte_t *)next_pgtable;
-+ next_pgtable += PTRS_PER_PTE * sizeof (pte_t);
-+ pgd_val(*pg_dir) = (unsigned long) pg_table;
-+ pg_dir++;
-+
-+ /* now change pg_table to kernel virtual addresses */
-+ for (i=0; i<PTRS_PER_PTE; ++i, ++pg_table)
-+ {
-+ pte_t pte = pfn_pte(virt_to_pfn(address), PAGE_INIT);
-+ if (address >= (unsigned long)high_memory)
-+ pte_val (pte) = 0;
-+
-+ set_pte (pg_table, pte);
-+ address += PAGE_SIZE;
-+ }
-+ }
-+
-+ current->mm = NULL;
-+
-+ /* clear zones */
-+ for (zone = 0; zone < MAX_NR_ZONES; zone++)
-+ zones_size[zone] = 0x0;
-+
-+ /* allocate the bottom 32M (0x40x 0x41x) to DMA - head.S marks them NO CACHE */
-+ /* JKM - this should be changed to allocate from the TOP (0x4f,0x4e) but the
-+ * allocator is being a bit challenging */
-+ zones_size[ZONE_DMA] = (32*1024*1024) >> PAGE_SHIFT;
-+
-+ /* allocate the rest to NORMAL - head.S marks them CACHE */
-+ zones_size[ZONE_NORMAL] = (((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT) - zones_size[0];
-+
-+ free_area_init(zones_size);
-+}
-+
-+
-+int cf_tlb_miss(struct pt_regs *regs, int write, int dtlb, int extension_word)
-+{
-+ struct mm_struct *mm;
-+ pgd_t *pgd;
-+ pmd_t *pmd;
-+ pte_t *pte;
-+ unsigned long mmuar;
-+ int asid;
-+ int flags;
-+
-+ local_save_flags(flags);
-+ local_irq_disable();
-+
-+ mmuar = ( dtlb ) ? regs->mmuar
-+ : regs->pc + (extension_word * sizeof(long));
-+
-+ mm = (!user_mode(regs) && (mmuar >= PAGE_OFFSET)) ? &init_mm
-+ : current->mm;
-+ if (!mm) {
-+ local_irq_restore(flags);
-+ return (-1);
-+ }
-+
-+ pgd = pgd_offset(mm, mmuar);
-+ if (pgd_none(*pgd)) {
-+ local_irq_restore(flags);
-+ return (-1);
-+ }
-+
-+ pmd = pmd_offset(pgd, mmuar);
-+ if (pmd_none(*pmd)) {
-+ local_irq_restore(flags);
-+ return (-1);
-+ }
-+
-+ pte = (mmuar >= PAGE_OFFSET) ? pte_offset_kernel(pmd, mmuar)
-+ : pte_offset_map(pmd, mmuar);
-+ if (pte_none(*pte) || !pte_present(*pte)) {
-+ local_irq_restore(flags);
-+ return (-1);
-+ }
-+
-+ if (write) {
-+ if (!pte_write(*pte)) {
-+ local_irq_restore(flags);
-+ return (-1);
-+ }
-+ set_pte(pte, pte_mkdirty(*pte));
-+ }
-+
-+ set_pte(pte, pte_mkyoung(*pte));
-+ asid = mm->context & 0xff;
-+ if (!pte_dirty(*pte) && mmuar<=PAGE_OFFSET)
-+ set_pte(pte, pte_wrprotect(*pte));
-+
-+ *MMUTR = (mmuar & PAGE_MASK) | (asid << CF_ASID_MMU_SHIFT)
-+ | (((int)(pte->pte) & (int)CF_PAGE_MMUTR_MASK ) >> CF_PAGE_MMUTR_SHIFT)
-+ | MMUTR_V;
-+
-+ *MMUDR = (pte_val(*pte) & PAGE_MASK)
-+ | ((pte->pte) & CF_PAGE_MMUDR_MASK)
-+ | MMUDR_SZ8K | MMUDR_X;
-+
-+ if ( dtlb )
-+ *MMUOR = MMUOR_ACC | MMUOR_UAA;
-+ else
-+ *MMUOR = MMUOR_ITLB | MMUOR_ACC | MMUOR_UAA;
-+
-+ asm ("nop");
-+ /*printk("cf_tlb_miss: va=%lx, pa=%lx\n", (mmuar & PAGE_MASK),
-+ (pte_val(*pte) & PAGE_MASK));*/
-+ local_irq_restore(flags);
-+ return (0);
-+}
-+
-+
-+/* The following was taken from arch/ppc/mmu_context.c
-+ *
-+ * Initialize the context management stuff.
-+ */
-+void __init mmu_context_init(void)
-+{
-+ /*
-+ * Some processors have too few contexts to reserve one for
-+ * init_mm, and require using context 0 for a normal task.
-+ * Other processors reserve the use of context zero for the kernel.
-+ * This code assumes FIRST_CONTEXT < 32.
-+ */
-+ context_map[0] = (1 << FIRST_CONTEXT) - 1;
-+ next_mmu_context = FIRST_CONTEXT;
-+ atomic_set(&nr_free_contexts, LAST_CONTEXT - FIRST_CONTEXT + 1);
-+}
-+
-+/*
-+ * Steal a context from a task that has one at the moment.
-+ * This is only used on 8xx and 4xx and we presently assume that
-+ * they don't do SMP. If they do then thicfpgalloc.hs will have to check
-+ * whether the MM we steal is in use.
-+ * We also assume that this is only used on systems that don't
-+ * use an MMU hash table - this is true for 8xx and 4xx.
-+ * This isn't an LRU system, it just frees up each context in
-+ * turn (sort-of pseudo-random replacement :). This would be the
-+ * place to implement an LRU scheme if anyone was motivated to do it.
-+ * -- paulus
-+ */
-+void steal_context(void)
-+{
-+ struct mm_struct *mm;
-+ /* free up context `next_mmu_context' */
-+ /* if we shouldn't free context 0, don't... */
-+ if (next_mmu_context < FIRST_CONTEXT)
-+ next_mmu_context = FIRST_CONTEXT;
-+ mm = context_mm[next_mmu_context];
-+ flush_tlb_mm(mm);
-+ destroy_context(mm);
-+}
---- a/arch/m68k/mm/hwtest.c
-+++ b/arch/m68k/mm/hwtest.c
-@@ -25,6 +25,7 @@
-
- #include <linux/module.h>
-
-+#ifndef CONFIG_COLDFIRE
- int hwreg_present( volatile void *regp )
- {
- int ret = 0;
-@@ -82,4 +83,5 @@ int hwreg_write( volatile void *regp, un
- return( ret );
- }
- EXPORT_SYMBOL(hwreg_write);
-+#endif
-
---- a/arch/m68k/mm/init.c
-+++ b/arch/m68k/mm/init.c
-@@ -122,7 +122,6 @@ void __init mem_init(void)
- if (MACH_IS_ATARI)
- atari_stram_mem_init_hook();
- #endif
--
- /* this will put all memory onto the freelists */
- totalram_pages = num_physpages = 0;
- for_each_online_pgdat(pgdat) {
-@@ -146,7 +145,7 @@ void __init mem_init(void)
- }
- }
-
--#ifndef CONFIG_SUN3
-+#if !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
- /* insert pointer tables allocated so far into the tablelist */
- init_pointer_table((unsigned long)kernel_pg_dir);
- for (i = 0; i < PTRS_PER_PGD; i++) {
---- a/arch/m68k/mm/kmap.c
-+++ b/arch/m68k/mm/kmap.c
-@@ -24,7 +24,11 @@
-
- #undef DEBUG
-
-+#ifndef CONFIG_COLDFIRE
- #define PTRTREESIZE (256*1024)
-+#else
-+#define PTRTREESIZE PAGE_SIZE
-+#endif
-
- /*
- * For 040/060 we can use the virtual memory area like other architectures,
-@@ -50,7 +54,11 @@ static inline void free_io_area(void *ad
-
- #else
-
-+#ifdef CONFIG_COLDFIRE
-+#define IO_SIZE PAGE_SIZE
-+#else
- #define IO_SIZE (256*1024)
-+#endif
-
- static struct vm_struct *iolist;
-
-@@ -170,7 +178,12 @@ void __iomem *__ioremap(unsigned long ph
- break;
- }
- } else {
-+#ifndef CONFIG_COLDFIRE
- physaddr |= (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY);
-+#else
-+ physaddr |= (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY | \
-+ _PAGE_READWRITE);
-+#endif
- switch (cacheflag) {
- case IOMAP_NOCACHE_SER:
- case IOMAP_NOCACHE_NONSER:
---- a/arch/m68k/mm/memory.c
-+++ b/arch/m68k/mm/memory.c
-@@ -203,7 +203,38 @@ static inline void pushcl040(unsigned lo
-
- void cache_clear (unsigned long paddr, int len)
- {
-- if (CPU_IS_040_OR_060) {
-+ if (CPU_IS_CFV4E) {
-+ unsigned long set;
-+ unsigned long start_set;
-+ unsigned long end_set;
-+
-+ start_set = paddr & _ICACHE_SET_MASK;
-+ end_set = (paddr+len-1) & _ICACHE_SET_MASK;
-+
-+ if (start_set > end_set) {
-+ /* from the begining to the lowest address */
-+ for (set = 0; set <= end_set; set += (0x10 - 3))
-+ asm volatile("cpushl %%bc,(%0)\n"
-+ "\taddq%.l #1,%0\n"
-+ "\tcpushl %%bc,(%0)\n"
-+ "\taddq%.l #1,%0\n"
-+ "\tcpushl %%bc,(%0)\n"
-+ "\taddq%.l #1,%0\n"
-+ "\tcpushl %%bc,(%0)" : : "a" (set));
-+
-+ /* next loop will finish the cache ie pass the hole */
-+ end_set = LAST_ICACHE_ADDR;
-+ }
-+ for (set = start_set; set <= end_set; set += (0x10 - 3))
-+ asm volatile("cpushl %%bc,(%0)\n"
-+ "\taddq%.l #1,%0\n"
-+ "\tcpushl %%bc,(%0)\n"
-+ "\taddq%.l #1,%0\n"
-+ "\tcpushl %%bc,(%0)\n"
-+ "\taddq%.l #1,%0\n"
-+ "\tcpushl %%bc,(%0)" : : "a" (set));
-+
-+ } else if (CPU_IS_040_OR_060) {
- int tmp;
-
- /*
-@@ -250,7 +281,38 @@ EXPORT_SYMBOL(cache_clear);
-
- void cache_push (unsigned long paddr, int len)
- {
-- if (CPU_IS_040_OR_060) {
-+ if (CPU_IS_CFV4E) {
-+ unsigned long set;
-+ unsigned long start_set;
-+ unsigned long end_set;
-+
-+ start_set = paddr & _ICACHE_SET_MASK;
-+ end_set = (paddr+len-1) & _ICACHE_SET_MASK;
-+
-+ if (start_set > end_set) {
-+ /* from the begining to the lowest address */
-+ for (set = 0; set <= end_set; set += (0x10 - 3))
-+ asm volatile("cpushl %%bc,(%0)\n"
-+ "\taddq%.l #1,%0\n"
-+ "\tcpushl %%bc,(%0)\n"
-+ "\taddq%.l #1,%0\n"
-+ "\tcpushl %%bc,(%0)\n"
-+ "\taddq%.l #1,%0\n"
-+ "\tcpushl %%bc,(%0)" : : "a" (set));
-+
-+ /* next loop will finish the cache ie pass the hole */
-+ end_set = LAST_ICACHE_ADDR;
-+ }
-+ for (set = start_set; set <= end_set; set += (0x10 - 3))
-+ asm volatile("cpushl %%bc,(%0)\n"
-+ "\taddq%.l #1,%0\n"
-+ "\tcpushl %%bc,(%0)\n"
-+ "\taddq%.l #1,%0\n"
-+ "\tcpushl %%bc,(%0)\n"
-+ "\taddq%.l #1,%0\n"
-+ "\tcpushl %%bc,(%0)" : : "a" (set));
-+
-+ } else if (CPU_IS_040_OR_060) {
- int tmp = PAGE_SIZE;
-
- /*
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