1 // SPDX-License-Identifier: GPL-2.0
3 * linux/arch/m68k/mm/kmap.c
5 * Copyright (C) 1997 Roman Hodek
7 * 10/01/99 cleaned up the code and changing to the same interface
8 * used by other architectures /Roman Zippel
11 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/string.h>
15 #include <linux/types.h>
16 #include <linux/slab.h>
17 #include <linux/vmalloc.h>
19 #include <asm/setup.h>
20 #include <asm/segment.h>
22 #include <asm/pgalloc.h>
27 #define PTRTREESIZE (256*1024)
30 * For 040/060 we can use the virtual memory area like other architectures,
31 * but for 020/030 we want to use early termination page descriptors and we
32 * can't mix this with normal page descriptors, so we have to copy that code
33 * (mm/vmalloc.c) and return appropriately aligned addresses.
36 #ifdef CPU_M68040_OR_M68060_ONLY
38 #define IO_SIZE PAGE_SIZE
40 static inline struct vm_struct *get_io_area(unsigned long size)
42 return get_vm_area(size, VM_IOREMAP);
46 static inline void free_io_area(void *addr)
48 vfree((void *)(PAGE_MASK & (unsigned long)addr));
53 #define IO_SIZE (256*1024)
55 static struct vm_struct *iolist;
57 static struct vm_struct *get_io_area(unsigned long size)
60 struct vm_struct **p, *tmp, *area;
62 area = kmalloc(sizeof(*area), GFP_KERNEL);
66 for (p = &iolist; (tmp = *p) ; p = &tmp->next) {
67 if (size + addr < (unsigned long)tmp->addr)
69 if (addr > KMAP_END-size) {
73 addr = tmp->size + (unsigned long)tmp->addr;
75 area->addr = (void *)addr;
76 area->size = size + IO_SIZE;
82 static inline void free_io_area(void *addr)
84 struct vm_struct **p, *tmp;
88 addr = (void *)((unsigned long)addr & -IO_SIZE);
89 for (p = &iolist ; (tmp = *p) ; p = &tmp->next) {
90 if (tmp->addr == addr) {
92 /* remove gap added in get_io_area() */
93 __iounmap(tmp->addr, tmp->size - IO_SIZE);
103 * Map some physical address range into the kernel address space.
105 /* Rewritten by Andreas Schwab to remove all races. */
107 void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag)
109 struct vm_struct *area;
110 unsigned long virtaddr, retaddr;
117 * Don't allow mappings that wrap..
119 if (!size || physaddr > (unsigned long)(-size))
124 if ((physaddr >= 0x40000000) && (physaddr + size < 0x60000000)
125 && (cacheflag == IOMAP_NOCACHE_SER))
126 return (void __iomem *)physaddr;
129 #ifdef CONFIG_COLDFIRE
130 if (__cf_internalio(physaddr))
131 return (void __iomem *) physaddr;
135 printk("ioremap: 0x%lx,0x%lx(%d) - ", physaddr, size, cacheflag);
138 * Mappings have to be aligned
140 offset = physaddr & (IO_SIZE - 1);
141 physaddr &= -IO_SIZE;
142 size = (size + offset + IO_SIZE - 1) & -IO_SIZE;
147 area = get_io_area(size);
151 virtaddr = (unsigned long)area->addr;
152 retaddr = virtaddr + offset;
154 printk("0x%lx,0x%lx,0x%lx", physaddr, virtaddr, retaddr);
158 * add cache and table flags to physical address
160 if (CPU_IS_040_OR_060) {
161 physaddr |= (_PAGE_PRESENT | _PAGE_GLOBAL040 |
162 _PAGE_ACCESSED | _PAGE_DIRTY);
164 case IOMAP_FULL_CACHING:
165 physaddr |= _PAGE_CACHE040;
167 case IOMAP_NOCACHE_SER:
169 physaddr |= _PAGE_NOCACHE_S;
171 case IOMAP_NOCACHE_NONSER:
172 physaddr |= _PAGE_NOCACHE;
174 case IOMAP_WRITETHROUGH:
175 physaddr |= _PAGE_CACHE040W;
179 physaddr |= (_PAGE_PRESENT | _PAGE_ACCESSED |
180 _PAGE_DIRTY | _PAGE_READWRITE);
182 case IOMAP_NOCACHE_SER:
183 case IOMAP_NOCACHE_NONSER:
185 physaddr |= _PAGE_NOCACHE030;
187 case IOMAP_FULL_CACHING:
188 case IOMAP_WRITETHROUGH:
193 while ((long)size > 0) {
195 if (!(virtaddr & (PTRTREESIZE-1)))
196 printk ("\npa=%#lx va=%#lx ", physaddr, virtaddr);
198 pgd_dir = pgd_offset_k(virtaddr);
199 pmd_dir = pmd_alloc(&init_mm, pgd_dir, virtaddr);
201 printk("ioremap: no mem for pmd_dir\n");
205 if (CPU_IS_020_OR_030) {
206 pmd_dir->pmd[(virtaddr/PTRTREESIZE) & 15] = physaddr;
207 physaddr += PTRTREESIZE;
208 virtaddr += PTRTREESIZE;
211 pte_dir = pte_alloc_kernel(pmd_dir, virtaddr);
213 printk("ioremap: no mem for pte_dir\n");
217 pte_val(*pte_dir) = physaddr;
218 virtaddr += PAGE_SIZE;
219 physaddr += PAGE_SIZE;
228 return (void __iomem *)retaddr;
230 EXPORT_SYMBOL(__ioremap);
233 * Unmap an ioremap()ed region again
235 void iounmap(void __iomem *addr)
238 if ((!MACH_IS_AMIGA) ||
239 (((unsigned long)addr < 0x40000000) ||
240 ((unsigned long)addr > 0x60000000)))
241 free_io_area((__force void *)addr);
243 #ifdef CONFIG_COLDFIRE
244 if (cf_internalio(addr))
247 free_io_area((__force void *)addr);
250 EXPORT_SYMBOL(iounmap);
253 * __iounmap unmaps nearly everything, so be careful
254 * Currently it doesn't free pointer/page tables anymore but this
255 * wasn't used anyway and might be added later.
257 void __iounmap(void *addr, unsigned long size)
259 unsigned long virtaddr = (unsigned long)addr;
264 while ((long)size > 0) {
265 pgd_dir = pgd_offset_k(virtaddr);
266 if (pgd_bad(*pgd_dir)) {
267 printk("iounmap: bad pgd(%08lx)\n", pgd_val(*pgd_dir));
271 pmd_dir = pmd_offset(pgd_dir, virtaddr);
273 if (CPU_IS_020_OR_030) {
274 int pmd_off = (virtaddr/PTRTREESIZE) & 15;
275 int pmd_type = pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK;
277 if (pmd_type == _PAGE_PRESENT) {
278 pmd_dir->pmd[pmd_off] = 0;
279 virtaddr += PTRTREESIZE;
282 } else if (pmd_type == 0)
286 if (pmd_bad(*pmd_dir)) {
287 printk("iounmap: bad pmd (%08lx)\n", pmd_val(*pmd_dir));
291 pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
293 pte_val(*pte_dir) = 0;
294 virtaddr += PAGE_SIZE;
302 * Set new cache mode for some kernel address space.
303 * The caller must push data for that range itself, if such data may already
306 void kernel_set_cachemode(void *addr, unsigned long size, int cmode)
308 unsigned long virtaddr = (unsigned long)addr;
313 if (CPU_IS_040_OR_060) {
315 case IOMAP_FULL_CACHING:
316 cmode = _PAGE_CACHE040;
318 case IOMAP_NOCACHE_SER:
320 cmode = _PAGE_NOCACHE_S;
322 case IOMAP_NOCACHE_NONSER:
323 cmode = _PAGE_NOCACHE;
325 case IOMAP_WRITETHROUGH:
326 cmode = _PAGE_CACHE040W;
331 case IOMAP_NOCACHE_SER:
332 case IOMAP_NOCACHE_NONSER:
334 cmode = _PAGE_NOCACHE030;
336 case IOMAP_FULL_CACHING:
337 case IOMAP_WRITETHROUGH:
342 while ((long)size > 0) {
343 pgd_dir = pgd_offset_k(virtaddr);
344 if (pgd_bad(*pgd_dir)) {
345 printk("iocachemode: bad pgd(%08lx)\n", pgd_val(*pgd_dir));
349 pmd_dir = pmd_offset(pgd_dir, virtaddr);
351 if (CPU_IS_020_OR_030) {
352 int pmd_off = (virtaddr/PTRTREESIZE) & 15;
354 if ((pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK) == _PAGE_PRESENT) {
355 pmd_dir->pmd[pmd_off] = (pmd_dir->pmd[pmd_off] &
356 _CACHEMASK040) | cmode;
357 virtaddr += PTRTREESIZE;
363 if (pmd_bad(*pmd_dir)) {
364 printk("iocachemode: bad pmd (%08lx)\n", pmd_val(*pmd_dir));
368 pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
370 pte_val(*pte_dir) = (pte_val(*pte_dir) & _CACHEMASK040) | cmode;
371 virtaddr += PAGE_SIZE;
377 EXPORT_SYMBOL(kernel_set_cachemode);