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-rw-r--r--arch/m68k/mm/kmap.c392
1 files changed, 392 insertions, 0 deletions
diff --git a/arch/m68k/mm/kmap.c b/arch/m68k/mm/kmap.c
new file mode 100644
index 000000000..1269d513b
--- /dev/null
+++ b/arch/m68k/mm/kmap.c
@@ -0,0 +1,392 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/arch/m68k/mm/kmap.c
+ *
+ * Copyright (C) 1997 Roman Hodek
+ *
+ * 10/01/99 cleaned up the code and changing to the same interface
+ * used by other architectures /Roman Zippel
+ */
+
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+
+#include <asm/setup.h>
+#include <asm/segment.h>
+#include <asm/page.h>
+#include <asm/io.h>
+#include <asm/tlbflush.h>
+
+#undef DEBUG
+
+/*
+ * For 040/060 we can use the virtual memory area like other architectures,
+ * but for 020/030 we want to use early termination page descriptors and we
+ * can't mix this with normal page descriptors, so we have to copy that code
+ * (mm/vmalloc.c) and return appropriately aligned addresses.
+ */
+
+#ifdef CPU_M68040_OR_M68060_ONLY
+
+#define IO_SIZE PAGE_SIZE
+
+static inline struct vm_struct *get_io_area(unsigned long size)
+{
+ return get_vm_area(size, VM_IOREMAP);
+}
+
+
+static inline void free_io_area(void *addr)
+{
+ vfree((void *)(PAGE_MASK & (unsigned long)addr));
+}
+
+#else
+
+#define IO_SIZE PMD_SIZE
+
+static struct vm_struct *iolist;
+
+/*
+ * __free_io_area unmaps nearly everything, so be careful
+ * Currently it doesn't free pointer/page tables anymore but this
+ * wasn't used anyway and might be added later.
+ */
+static void __free_io_area(void *addr, unsigned long size)
+{
+ unsigned long virtaddr = (unsigned long)addr;
+ pgd_t *pgd_dir;
+ p4d_t *p4d_dir;
+ pud_t *pud_dir;
+ pmd_t *pmd_dir;
+ pte_t *pte_dir;
+
+ while ((long)size > 0) {
+ pgd_dir = pgd_offset_k(virtaddr);
+ p4d_dir = p4d_offset(pgd_dir, virtaddr);
+ pud_dir = pud_offset(p4d_dir, virtaddr);
+ if (pud_bad(*pud_dir)) {
+ printk("iounmap: bad pud(%08lx)\n", pud_val(*pud_dir));
+ pud_clear(pud_dir);
+ return;
+ }
+ pmd_dir = pmd_offset(pud_dir, virtaddr);
+
+#if CONFIG_PGTABLE_LEVELS == 3
+ if (CPU_IS_020_OR_030) {
+ int pmd_type = pmd_val(*pmd_dir) & _DESCTYPE_MASK;
+
+ if (pmd_type == _PAGE_PRESENT) {
+ pmd_clear(pmd_dir);
+ virtaddr += PMD_SIZE;
+ size -= PMD_SIZE;
+
+ } else if (pmd_type == 0)
+ continue;
+ }
+#endif
+
+ if (pmd_bad(*pmd_dir)) {
+ printk("iounmap: bad pmd (%08lx)\n", pmd_val(*pmd_dir));
+ pmd_clear(pmd_dir);
+ return;
+ }
+ pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
+
+ pte_val(*pte_dir) = 0;
+ virtaddr += PAGE_SIZE;
+ size -= PAGE_SIZE;
+ }
+
+ flush_tlb_all();
+}
+
+static struct vm_struct *get_io_area(unsigned long size)
+{
+ unsigned long addr;
+ struct vm_struct **p, *tmp, *area;
+
+ area = kmalloc(sizeof(*area), GFP_KERNEL);
+ if (!area)
+ return NULL;
+ addr = KMAP_START;
+ for (p = &iolist; (tmp = *p) ; p = &tmp->next) {
+ if (size + addr < (unsigned long)tmp->addr)
+ break;
+ if (addr > KMAP_END-size) {
+ kfree(area);
+ return NULL;
+ }
+ addr = tmp->size + (unsigned long)tmp->addr;
+ }
+ area->addr = (void *)addr;
+ area->size = size + IO_SIZE;
+ area->next = *p;
+ *p = area;
+ return area;
+}
+
+static inline void free_io_area(void *addr)
+{
+ struct vm_struct **p, *tmp;
+
+ if (!addr)
+ return;
+ addr = (void *)((unsigned long)addr & -IO_SIZE);
+ for (p = &iolist ; (tmp = *p) ; p = &tmp->next) {
+ if (tmp->addr == addr) {
+ *p = tmp->next;
+ /* remove gap added in get_io_area() */
+ __free_io_area(tmp->addr, tmp->size - IO_SIZE);
+ kfree(tmp);
+ return;
+ }
+ }
+}
+
+#endif
+
+/*
+ * Map some physical address range into the kernel address space.
+ */
+/* Rewritten by Andreas Schwab to remove all races. */
+
+void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag)
+{
+ struct vm_struct *area;
+ unsigned long virtaddr, retaddr;
+ long offset;
+ pgd_t *pgd_dir;
+ p4d_t *p4d_dir;
+ pud_t *pud_dir;
+ pmd_t *pmd_dir;
+ pte_t *pte_dir;
+
+ /*
+ * Don't allow mappings that wrap..
+ */
+ if (!size || physaddr > (unsigned long)(-size))
+ return NULL;
+
+#ifdef CONFIG_AMIGA
+ if (MACH_IS_AMIGA) {
+ if ((physaddr >= 0x40000000) && (physaddr + size < 0x60000000)
+ && (cacheflag == IOMAP_NOCACHE_SER))
+ return (void __iomem *)physaddr;
+ }
+#endif
+#ifdef CONFIG_COLDFIRE
+ if (__cf_internalio(physaddr))
+ return (void __iomem *) physaddr;
+#endif
+
+#ifdef DEBUG
+ printk("ioremap: 0x%lx,0x%lx(%d) - ", physaddr, size, cacheflag);
+#endif
+ /*
+ * Mappings have to be aligned
+ */
+ offset = physaddr & (IO_SIZE - 1);
+ physaddr &= -IO_SIZE;
+ size = (size + offset + IO_SIZE - 1) & -IO_SIZE;
+
+ /*
+ * Ok, go for it..
+ */
+ area = get_io_area(size);
+ if (!area)
+ return NULL;
+
+ virtaddr = (unsigned long)area->addr;
+ retaddr = virtaddr + offset;
+#ifdef DEBUG
+ printk("0x%lx,0x%lx,0x%lx", physaddr, virtaddr, retaddr);
+#endif
+
+ /*
+ * add cache and table flags to physical address
+ */
+ if (CPU_IS_040_OR_060) {
+ physaddr |= (_PAGE_PRESENT | _PAGE_GLOBAL040 |
+ _PAGE_ACCESSED | _PAGE_DIRTY);
+ switch (cacheflag) {
+ case IOMAP_FULL_CACHING:
+ physaddr |= _PAGE_CACHE040;
+ break;
+ case IOMAP_NOCACHE_SER:
+ default:
+ physaddr |= _PAGE_NOCACHE_S;
+ break;
+ case IOMAP_NOCACHE_NONSER:
+ physaddr |= _PAGE_NOCACHE;
+ break;
+ case IOMAP_WRITETHROUGH:
+ physaddr |= _PAGE_CACHE040W;
+ break;
+ }
+ } else {
+ physaddr |= (_PAGE_PRESENT | _PAGE_ACCESSED |
+ _PAGE_DIRTY | _PAGE_READWRITE);
+ switch (cacheflag) {
+ case IOMAP_NOCACHE_SER:
+ case IOMAP_NOCACHE_NONSER:
+ default:
+ physaddr |= _PAGE_NOCACHE030;
+ break;
+ case IOMAP_FULL_CACHING:
+ case IOMAP_WRITETHROUGH:
+ break;
+ }
+ }
+
+ while ((long)size > 0) {
+#ifdef DEBUG
+ if (!(virtaddr & (PMD_SIZE-1)))
+ printk ("\npa=%#lx va=%#lx ", physaddr, virtaddr);
+#endif
+ pgd_dir = pgd_offset_k(virtaddr);
+ p4d_dir = p4d_offset(pgd_dir, virtaddr);
+ pud_dir = pud_offset(p4d_dir, virtaddr);
+ pmd_dir = pmd_alloc(&init_mm, pud_dir, virtaddr);
+ if (!pmd_dir) {
+ printk("ioremap: no mem for pmd_dir\n");
+ return NULL;
+ }
+
+#if CONFIG_PGTABLE_LEVELS == 3
+ if (CPU_IS_020_OR_030) {
+ pmd_val(*pmd_dir) = physaddr;
+ physaddr += PMD_SIZE;
+ virtaddr += PMD_SIZE;
+ size -= PMD_SIZE;
+ } else
+#endif
+ {
+ pte_dir = pte_alloc_kernel(pmd_dir, virtaddr);
+ if (!pte_dir) {
+ printk("ioremap: no mem for pte_dir\n");
+ return NULL;
+ }
+
+ pte_val(*pte_dir) = physaddr;
+ virtaddr += PAGE_SIZE;
+ physaddr += PAGE_SIZE;
+ size -= PAGE_SIZE;
+ }
+ }
+#ifdef DEBUG
+ printk("\n");
+#endif
+ flush_tlb_all();
+
+ return (void __iomem *)retaddr;
+}
+EXPORT_SYMBOL(__ioremap);
+
+/*
+ * Unmap an ioremap()ed region again
+ */
+void iounmap(void __iomem *addr)
+{
+#ifdef CONFIG_AMIGA
+ if ((!MACH_IS_AMIGA) ||
+ (((unsigned long)addr < 0x40000000) ||
+ ((unsigned long)addr > 0x60000000)))
+ free_io_area((__force void *)addr);
+#else
+#ifdef CONFIG_COLDFIRE
+ if (cf_internalio(addr))
+ return;
+#endif
+ free_io_area((__force void *)addr);
+#endif
+}
+EXPORT_SYMBOL(iounmap);
+
+/*
+ * Set new cache mode for some kernel address space.
+ * The caller must push data for that range itself, if such data may already
+ * be in the cache.
+ */
+void kernel_set_cachemode(void *addr, unsigned long size, int cmode)
+{
+ unsigned long virtaddr = (unsigned long)addr;
+ pgd_t *pgd_dir;
+ p4d_t *p4d_dir;
+ pud_t *pud_dir;
+ pmd_t *pmd_dir;
+ pte_t *pte_dir;
+
+ if (CPU_IS_040_OR_060) {
+ switch (cmode) {
+ case IOMAP_FULL_CACHING:
+ cmode = _PAGE_CACHE040;
+ break;
+ case IOMAP_NOCACHE_SER:
+ default:
+ cmode = _PAGE_NOCACHE_S;
+ break;
+ case IOMAP_NOCACHE_NONSER:
+ cmode = _PAGE_NOCACHE;
+ break;
+ case IOMAP_WRITETHROUGH:
+ cmode = _PAGE_CACHE040W;
+ break;
+ }
+ } else {
+ switch (cmode) {
+ case IOMAP_NOCACHE_SER:
+ case IOMAP_NOCACHE_NONSER:
+ default:
+ cmode = _PAGE_NOCACHE030;
+ break;
+ case IOMAP_FULL_CACHING:
+ case IOMAP_WRITETHROUGH:
+ cmode = 0;
+ }
+ }
+
+ while ((long)size > 0) {
+ pgd_dir = pgd_offset_k(virtaddr);
+ p4d_dir = p4d_offset(pgd_dir, virtaddr);
+ pud_dir = pud_offset(p4d_dir, virtaddr);
+ if (pud_bad(*pud_dir)) {
+ printk("iocachemode: bad pud(%08lx)\n", pud_val(*pud_dir));
+ pud_clear(pud_dir);
+ return;
+ }
+ pmd_dir = pmd_offset(pud_dir, virtaddr);
+
+#if CONFIG_PGTABLE_LEVELS == 3
+ if (CPU_IS_020_OR_030) {
+ unsigned long pmd = pmd_val(*pmd_dir);
+
+ if ((pmd & _DESCTYPE_MASK) == _PAGE_PRESENT) {
+ *pmd_dir = __pmd((pmd & _CACHEMASK040) | cmode);
+ virtaddr += PMD_SIZE;
+ size -= PMD_SIZE;
+ continue;
+ }
+ }
+#endif
+
+ if (pmd_bad(*pmd_dir)) {
+ printk("iocachemode: bad pmd (%08lx)\n", pmd_val(*pmd_dir));
+ pmd_clear(pmd_dir);
+ return;
+ }
+ pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
+
+ pte_val(*pte_dir) = (pte_val(*pte_dir) & _CACHEMASK040) | cmode;
+ virtaddr += PAGE_SIZE;
+ size -= PAGE_SIZE;
+ }
+
+ flush_tlb_all();
+}
+EXPORT_SYMBOL(kernel_set_cachemode);
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