1 /*
2 * Simple allocator for internal RAM in ETRAX FS
3 *
4 * Copyright (c) 2004 Axis Communications AB.
5 */
6
7 #include <linux/list.h>
8 #include <linux/slab.h>
9 #include <asm/io.h>
10 #include <memmap.h>
11
12 #define STATUS_FREE 0
13 #define STATUS_ALLOCATED 1
14
15 #ifdef CONFIG_ETRAX_L2CACHE
16 #define RESERVED_SIZE 66*1024
17 #else
18 #define RESERVED_SIZE 0
19 #endif
20
21 struct intmem_allocation {
22 struct list_head entry;
23 unsigned int size;
24 unsigned offset;
25 char status;
26 };
27
28
29 static struct list_head intmem_allocations;
30 static void* intmem_virtual;
31
crisv32_intmem_init(void)32 static void crisv32_intmem_init(void)
33 {
34 static int initiated = 0;
35 if (!initiated) {
36 struct intmem_allocation* alloc =
37 (struct intmem_allocation*)kmalloc(sizeof *alloc, GFP_KERNEL);
38 INIT_LIST_HEAD(&intmem_allocations);
39 intmem_virtual = ioremap(MEM_INTMEM_START + RESERVED_SIZE,
40 MEM_INTMEM_SIZE - RESERVED_SIZE);
41 initiated = 1;
42 alloc->size = MEM_INTMEM_SIZE - RESERVED_SIZE;
43 alloc->offset = 0;
44 alloc->status = STATUS_FREE;
45 list_add_tail(&alloc->entry, &intmem_allocations);
46 }
47 }
48
crisv32_intmem_alloc(unsigned size,unsigned align)49 void* crisv32_intmem_alloc(unsigned size, unsigned align)
50 {
51 struct intmem_allocation* allocation;
52 struct intmem_allocation* tmp;
53 void* ret = NULL;
54
55 preempt_disable();
56 crisv32_intmem_init();
57
58 list_for_each_entry_safe(allocation, tmp, &intmem_allocations, entry) {
59 int alignment = allocation->offset % align;
60 alignment = alignment ? align - alignment : alignment;
61
62 if (allocation->status == STATUS_FREE &&
63 allocation->size >= size + alignment) {
64 if (allocation->size > size + alignment) {
65 struct intmem_allocation* alloc =
66 (struct intmem_allocation*)
67 kmalloc(sizeof *alloc, GFP_ATOMIC);
68 alloc->status = STATUS_FREE;
69 alloc->size = allocation->size - size -
70 alignment;
71 alloc->offset = allocation->offset + size +
72 alignment;
73 list_add(&alloc->entry, &allocation->entry);
74
75 if (alignment) {
76 struct intmem_allocation *tmp;
77 tmp = (struct intmem_allocation *)
78 kmalloc(sizeof *tmp,
79 GFP_ATOMIC);
80 tmp->offset = allocation->offset;
81 tmp->size = alignment;
82 tmp->status = STATUS_FREE;
83 allocation->offset += alignment;
84 list_add_tail(&tmp->entry,
85 &allocation->entry);
86 }
87 }
88 allocation->status = STATUS_ALLOCATED;
89 allocation->size = size;
90 ret = (void*)((int)intmem_virtual + allocation->offset);
91 }
92 }
93 preempt_enable();
94 return ret;
95 }
96
crisv32_intmem_free(void * addr)97 void crisv32_intmem_free(void* addr)
98 {
99 struct intmem_allocation* allocation;
100 struct intmem_allocation* tmp;
101
102 if (addr == NULL)
103 return;
104
105 preempt_disable();
106 crisv32_intmem_init();
107
108 list_for_each_entry_safe(allocation, tmp, &intmem_allocations, entry) {
109 if (allocation->offset == (int)(addr - intmem_virtual)) {
110 struct intmem_allocation *prev =
111 list_entry(allocation->entry.prev,
112 struct intmem_allocation, entry);
113 struct intmem_allocation *next =
114 list_entry(allocation->entry.next,
115 struct intmem_allocation, entry);
116
117 allocation->status = STATUS_FREE;
118 /* Join with prev and/or next if also free */
119 if ((prev != &intmem_allocations) &&
120 (prev->status == STATUS_FREE)) {
121 prev->size += allocation->size;
122 list_del(&allocation->entry);
123 kfree(allocation);
124 allocation = prev;
125 }
126 if ((next != &intmem_allocations) &&
127 (next->status == STATUS_FREE)) {
128 allocation->size += next->size;
129 list_del(&next->entry);
130 kfree(next);
131 }
132 preempt_enable();
133 return;
134 }
135 }
136 preempt_enable();
137 }
138
crisv32_intmem_phys_to_virt(unsigned long addr)139 void* crisv32_intmem_phys_to_virt(unsigned long addr)
140 {
141 return (void *)(addr - (MEM_INTMEM_START + RESERVED_SIZE) +
142 (unsigned long)intmem_virtual);
143 }
144
crisv32_intmem_virt_to_phys(void * addr)145 unsigned long crisv32_intmem_virt_to_phys(void* addr)
146 {
147 return (unsigned long)((unsigned long )addr -
148 (unsigned long)intmem_virtual + MEM_INTMEM_START +
149 RESERVED_SIZE);
150 }
151
152 module_init(crisv32_intmem_init);
153
154