patch-2.4.6 linux/arch/m68k/sun3/sun3dvma.c
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- Lines: 296
- Date:
Mon Jun 11 19:15:27 2001
- Orig file:
v2.4.5/linux/arch/m68k/sun3/sun3dvma.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.5/linux/arch/m68k/sun3/sun3dvma.c linux/arch/m68k/sun3/sun3dvma.c
@@ -0,0 +1,295 @@
+/*
+ * linux/arch/m68k/mm/sun3dvma.c
+ *
+ * Copyright (C) 2000 Sam Creasey
+ *
+ * Contains common routines for sun3/sun3x DVMA management.
+ */
+
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/list.h>
+
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/dvma.h>
+
+#ifdef CONFIG_SUN3X
+extern void dvma_unmap_iommu(unsigned long baddr, int len);
+#else
+static inline void dvma_unmap_iommu(unsigned long a, int b)
+{
+}
+#endif
+
+unsigned long iommu_use[IOMMU_TOTAL_ENTRIES];
+
+#define dvma_index(baddr) ((baddr - DVMA_START) >> DVMA_PAGE_SHIFT)
+
+#define dvma_entry_use(baddr) (iommu_use[dvma_index(baddr)])
+
+struct hole {
+ unsigned long start;
+ unsigned long end;
+ unsigned long size;
+ struct list_head list;
+};
+
+static struct list_head hole_list;
+static struct list_head hole_cache;
+static struct hole initholes[64];
+
+static inline int refill(void)
+{
+
+ struct hole *hole;
+ struct hole *prev = NULL;
+ struct list_head *cur;
+ int ret = 0;
+
+ list_for_each(cur, &hole_list) {
+ hole = list_entry(cur, struct hole, list);
+
+ if(!prev) {
+ prev = hole;
+ continue;
+ }
+
+ if(hole->end == prev->start) {
+ hole->size += prev->size;
+ hole->end = prev->end;
+ list_del(&(prev->list));
+ list_add(&(prev->list), &hole_cache);
+ ret++;
+ }
+
+ }
+
+ return ret;
+}
+
+static inline struct hole *rmcache(void)
+{
+ struct hole *ret;
+
+ if(list_empty(&hole_cache)) {
+ if(!refill()) {
+ printk("out of dvma hole cache!\n");
+ BUG();
+ }
+ }
+
+ ret = list_entry(hole_cache.next, struct hole, list);
+ list_del(&(ret->list));
+
+ return ret;
+
+}
+
+static inline unsigned long get_baddr(int len, unsigned long align)
+{
+
+ struct list_head *cur;
+ struct hole *hole;
+
+ if(list_empty(&hole_list)) {
+ printk("out of dvma holes!\n");
+ BUG();
+ }
+
+ list_for_each(cur, &hole_list) {
+ unsigned long newlen;
+
+ hole = list_entry(cur, struct hole, list);
+
+ if(align > DVMA_PAGE_SIZE)
+ newlen = len + ((hole->end - len) & (align-1));
+ else
+ newlen = len;
+
+ if(hole->size > newlen) {
+ hole->end -= newlen;
+ hole->size -= newlen;
+ dvma_entry_use(hole->end) = newlen;
+ return hole->end;
+ } else if(hole->size == newlen) {
+ list_del(&(hole->list));
+ list_add(&(hole->list), &hole_cache);
+ dvma_entry_use(hole->start) = newlen;
+ return hole->start;
+ }
+
+ }
+
+ printk("unable to find dvma hole!\n");
+ BUG();
+ return 0;
+}
+
+static inline int free_baddr(unsigned long baddr)
+{
+
+ unsigned long len;
+ struct hole *hole;
+ struct list_head *cur;
+ unsigned long orig_baddr;
+
+ orig_baddr = baddr;
+ len = dvma_entry_use(baddr);
+ dvma_entry_use(baddr) = 0;
+ baddr &= DVMA_PAGE_MASK;
+ dvma_unmap_iommu(baddr, len);
+
+ list_for_each(cur, &hole_list) {
+ hole = list_entry(cur, struct hole, list);
+
+ if(hole->end == baddr) {
+ hole->end += len;
+ hole->size += len;
+ return 0;
+ } else if(hole->start == (baddr + len)) {
+ hole->start = baddr;
+ hole->size += len;
+ return 0;
+ }
+
+ }
+
+ hole = rmcache();
+
+ hole->start = baddr;
+ hole->end = baddr + len;
+ hole->size = len;
+
+// list_add_tail(&(hole->list), cur);
+ list_add(&(hole->list), cur);
+
+ return 0;
+
+}
+
+void dvma_init(void)
+{
+
+ struct hole *hole;
+ int i;
+
+ INIT_LIST_HEAD(&hole_list);
+ INIT_LIST_HEAD(&hole_cache);
+
+ /* prepare the hole cache */
+ for(i = 0; i < 64; i++)
+ list_add(&(initholes[i].list), &hole_cache);
+
+ hole = rmcache();
+ hole->start = DVMA_START;
+ hole->end = DVMA_END;
+ hole->size = DVMA_SIZE;
+
+ list_add(&(hole->list), &hole_list);
+
+ memset(iommu_use, 0, sizeof(iommu_use));
+
+ dvma_unmap_iommu(DVMA_START, DVMA_SIZE);
+
+#ifdef CONFIG_SUN3
+ sun3_dvma_init();
+#endif
+
+}
+
+inline unsigned long dvma_map_align(unsigned long kaddr, int len, int align)
+{
+
+ unsigned long baddr;
+ unsigned long off;
+
+ if(!len)
+ len = 0x800;
+
+ if(!kaddr || !len) {
+// printk("error: kaddr %lx len %x\n", kaddr, len);
+// *(int *)4 = 0;
+ return 0;
+ }
+
+#ifdef DEBUG
+ printk("dvma_map request %08lx bytes from %08lx\n",
+ len, kaddr);
+#endif
+ off = kaddr & ~DVMA_PAGE_MASK;
+ kaddr &= PAGE_MASK;
+ len += off;
+ len = ((len + (DVMA_PAGE_SIZE-1)) & DVMA_PAGE_MASK);
+
+ if(align == 0)
+ align = DVMA_PAGE_SIZE;
+ else
+ align = ((align + (DVMA_PAGE_SIZE-1)) & DVMA_PAGE_MASK);
+
+ baddr = get_baddr(len, align);
+// printk("using baddr %lx\n", baddr);
+
+ if(!dvma_map_iommu(kaddr, baddr, len))
+ return (baddr + off);
+
+ printk("dvma_map failed kaddr %lx baddr %lx len %x\n", kaddr, baddr, len);
+ BUG();
+ return 0;
+}
+
+void dvma_unmap(void *baddr)
+{
+
+ free_baddr((unsigned long)baddr);
+
+ return;
+
+}
+
+
+void *dvma_malloc_align(unsigned long len, unsigned long align)
+{
+ unsigned long kaddr;
+ unsigned long baddr;
+ unsigned long vaddr;
+
+ if(!len)
+ return NULL;
+
+#ifdef DEBUG
+ printk("dvma_malloc request %lx bytes\n", len);
+#endif
+ len = ((len + (DVMA_PAGE_SIZE-1)) & DVMA_PAGE_MASK);
+
+ if((kaddr = __get_free_pages(GFP_ATOMIC, get_order(len))) == 0)
+ return NULL;
+
+ if((baddr = (unsigned long)dvma_map_align(kaddr, len, align)) == 0) {
+ free_pages(kaddr, get_order(len));
+ return NULL;
+ }
+
+ vaddr = dvma_btov(baddr);
+
+ if(dvma_map_cpu(kaddr, vaddr, len) < 0) {
+ dvma_unmap((void *)baddr);
+ free_pages(kaddr, get_order(len));
+ return NULL;
+ }
+
+#ifdef DEBUG
+ printk("mapped %08lx bytes %08lx kern -> %08lx bus\n",
+ len, kaddr, baddr);
+#endif
+
+ return (void *)vaddr;
+
+}
+
+void dvma_free(void *vaddr)
+{
+
+ return;
+
+}
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