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1da177e4 LT |
1 | /* |
2 | * Virtual DMA allocation | |
3 | * | |
4 | * (C) 1999 Thomas Bogendoerfer (tsbogend@alpha.franken.de) | |
5 | * | |
6 | * 11/26/2000 -- disabled the existing code because it didn't work for | |
7 | * me in 2.4. Replaced with a significantly more primitive version | |
8 | * similar to the sun3 code. the old functionality was probably more | |
9 | * desirable, but.... -- Sam Creasey (sammy@oh.verio.com) | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/bitops.h> | |
16 | #include <linux/mm.h> | |
17 | #include <linux/bootmem.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/vmalloc.h> | |
20 | ||
21 | #include <asm/sun3x.h> | |
22 | #include <asm/dvma.h> | |
23 | #include <asm/io.h> | |
24 | #include <asm/page.h> | |
25 | #include <asm/pgtable.h> | |
26 | #include <asm/pgalloc.h> | |
27 | ||
28 | /* IOMMU support */ | |
29 | ||
30 | #define IOMMU_ADDR_MASK 0x03ffe000 | |
31 | #define IOMMU_CACHE_INHIBIT 0x00000040 | |
32 | #define IOMMU_FULL_BLOCK 0x00000020 | |
33 | #define IOMMU_MODIFIED 0x00000010 | |
34 | #define IOMMU_USED 0x00000008 | |
35 | #define IOMMU_WRITE_PROTECT 0x00000004 | |
36 | #define IOMMU_DT_MASK 0x00000003 | |
37 | #define IOMMU_DT_INVALID 0x00000000 | |
38 | #define IOMMU_DT_VALID 0x00000001 | |
39 | #define IOMMU_DT_BAD 0x00000002 | |
40 | ||
41 | ||
42 | static volatile unsigned long *iommu_pte = (unsigned long *)SUN3X_IOMMU; | |
43 | ||
44 | ||
45 | #define dvma_entry_paddr(index) (iommu_pte[index] & IOMMU_ADDR_MASK) | |
46 | #define dvma_entry_vaddr(index,paddr) ((index << DVMA_PAGE_SHIFT) | \ | |
47 | (paddr & (DVMA_PAGE_SIZE-1))) | |
48 | #if 0 | |
49 | #define dvma_entry_set(index,addr) (iommu_pte[index] = \ | |
50 | (addr & IOMMU_ADDR_MASK) | \ | |
51 | IOMMU_DT_VALID | IOMMU_CACHE_INHIBIT) | |
52 | #else | |
53 | #define dvma_entry_set(index,addr) (iommu_pte[index] = \ | |
54 | (addr & IOMMU_ADDR_MASK) | \ | |
55 | IOMMU_DT_VALID) | |
56 | #endif | |
57 | #define dvma_entry_clr(index) (iommu_pte[index] = IOMMU_DT_INVALID) | |
58 | #define dvma_entry_hash(addr) ((addr >> DVMA_PAGE_SHIFT) ^ \ | |
59 | ((addr & 0x03c00000) >> \ | |
60 | (DVMA_PAGE_SHIFT+4))) | |
61 | ||
62 | #undef DEBUG | |
63 | ||
64 | #ifdef DEBUG | |
65 | /* code to print out a dvma mapping for debugging purposes */ | |
66 | void dvma_print (unsigned long dvma_addr) | |
67 | { | |
68 | ||
69 | unsigned long index; | |
70 | ||
71 | index = dvma_addr >> DVMA_PAGE_SHIFT; | |
72 | ||
73 | printk("idx %lx dvma_addr %08lx paddr %08lx\n", index, dvma_addr, | |
74 | dvma_entry_paddr(index)); | |
75 | ||
76 | ||
77 | } | |
78 | #endif | |
79 | ||
80 | ||
81 | /* create a virtual mapping for a page assigned within the IOMMU | |
82 | so that the cpu can reach it easily */ | |
83 | inline int dvma_map_cpu(unsigned long kaddr, | |
84 | unsigned long vaddr, int len) | |
85 | { | |
86 | pgd_t *pgd; | |
87 | unsigned long end; | |
88 | int ret = 0; | |
89 | ||
90 | kaddr &= PAGE_MASK; | |
91 | vaddr &= PAGE_MASK; | |
92 | ||
93 | end = PAGE_ALIGN(vaddr + len); | |
94 | ||
95 | #ifdef DEBUG | |
96 | printk("dvma: mapping kern %08lx to virt %08lx\n", | |
97 | kaddr, vaddr); | |
98 | #endif | |
99 | pgd = pgd_offset_k(vaddr); | |
100 | ||
101 | do { | |
102 | pmd_t *pmd; | |
103 | unsigned long end2; | |
104 | ||
105 | if((pmd = pmd_alloc(&init_mm, pgd, vaddr)) == NULL) { | |
106 | ret = -ENOMEM; | |
107 | goto out; | |
108 | } | |
109 | ||
110 | if((end & PGDIR_MASK) > (vaddr & PGDIR_MASK)) | |
111 | end2 = (vaddr + (PGDIR_SIZE-1)) & PGDIR_MASK; | |
112 | else | |
113 | end2 = end; | |
114 | ||
115 | do { | |
116 | pte_t *pte; | |
117 | unsigned long end3; | |
118 | ||
872fec16 | 119 | if((pte = pte_alloc_kernel(pmd, vaddr)) == NULL) { |
1da177e4 LT |
120 | ret = -ENOMEM; |
121 | goto out; | |
122 | } | |
123 | ||
124 | if((end2 & PMD_MASK) > (vaddr & PMD_MASK)) | |
125 | end3 = (vaddr + (PMD_SIZE-1)) & PMD_MASK; | |
126 | else | |
127 | end3 = end2; | |
128 | ||
129 | do { | |
130 | #ifdef DEBUG | |
131 | printk("mapping %08lx phys to %08lx\n", | |
132 | __pa(kaddr), vaddr); | |
133 | #endif | |
134 | set_pte(pte, pfn_pte(virt_to_pfn(kaddr), | |
135 | PAGE_KERNEL)); | |
136 | pte++; | |
137 | kaddr += PAGE_SIZE; | |
138 | vaddr += PAGE_SIZE; | |
139 | } while(vaddr < end3); | |
140 | ||
141 | } while(vaddr < end2); | |
142 | ||
143 | } while(vaddr < end); | |
144 | ||
145 | flush_tlb_all(); | |
146 | ||
147 | out: | |
148 | return ret; | |
149 | } | |
150 | ||
151 | ||
152 | inline int dvma_map_iommu(unsigned long kaddr, unsigned long baddr, | |
153 | int len) | |
154 | { | |
155 | unsigned long end, index; | |
156 | ||
157 | index = baddr >> DVMA_PAGE_SHIFT; | |
158 | end = ((baddr+len) >> DVMA_PAGE_SHIFT); | |
159 | ||
160 | if(len & ~DVMA_PAGE_MASK) | |
161 | end++; | |
162 | ||
163 | for(; index < end ; index++) { | |
164 | // if(dvma_entry_use(index)) | |
165 | // BUG(); | |
166 | // printk("mapping pa %lx to ba %lx\n", __pa(kaddr), index << DVMA_PAGE_SHIFT); | |
167 | ||
168 | dvma_entry_set(index, __pa(kaddr)); | |
169 | ||
170 | iommu_pte[index] |= IOMMU_FULL_BLOCK; | |
171 | // dvma_entry_inc(index); | |
172 | ||
173 | kaddr += DVMA_PAGE_SIZE; | |
174 | } | |
175 | ||
176 | #ifdef DEBUG | |
177 | for(index = (baddr >> DVMA_PAGE_SHIFT); index < end; index++) | |
178 | dvma_print(index << DVMA_PAGE_SHIFT); | |
179 | #endif | |
180 | return 0; | |
181 | ||
182 | } | |
183 | ||
184 | void dvma_unmap_iommu(unsigned long baddr, int len) | |
185 | { | |
186 | ||
187 | int index, end; | |
188 | ||
189 | ||
190 | index = baddr >> DVMA_PAGE_SHIFT; | |
191 | end = (DVMA_PAGE_ALIGN(baddr+len) >> DVMA_PAGE_SHIFT); | |
192 | ||
193 | for(; index < end ; index++) { | |
194 | #ifdef DEBUG | |
195 | printk("freeing bus mapping %08x\n", index << DVMA_PAGE_SHIFT); | |
196 | #endif | |
197 | #if 0 | |
198 | if(!dvma_entry_use(index)) | |
199 | printk("dvma_unmap freeing unused entry %04x\n", | |
200 | index); | |
201 | else | |
202 | dvma_entry_dec(index); | |
203 | #endif | |
204 | dvma_entry_clr(index); | |
205 | } | |
206 | ||
207 | } | |
208 |