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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/vmalloc.h>
19
20#include <asm/sun3x.h>
21#include <asm/dvma.h>
22#include <asm/io.h>
23#include <asm/page.h>
24#include <asm/pgtable.h>
25#include <asm/pgalloc.h>
26
27/* IOMMU support */
28
29#define IOMMU_ADDR_MASK 0x03ffe000
30#define IOMMU_CACHE_INHIBIT 0x00000040
31#define IOMMU_FULL_BLOCK 0x00000020
32#define IOMMU_MODIFIED 0x00000010
33#define IOMMU_USED 0x00000008
34#define IOMMU_WRITE_PROTECT 0x00000004
35#define IOMMU_DT_MASK 0x00000003
36#define IOMMU_DT_INVALID 0x00000000
37#define IOMMU_DT_VALID 0x00000001
38#define IOMMU_DT_BAD 0x00000002
39
40
41static volatile unsigned long *iommu_pte = (unsigned long *)SUN3X_IOMMU;
42
43
44#define dvma_entry_paddr(index) (iommu_pte[index] & IOMMU_ADDR_MASK)
45#define dvma_entry_vaddr(index,paddr) ((index << DVMA_PAGE_SHIFT) | \
46 (paddr & (DVMA_PAGE_SIZE-1)))
47#if 0
48#define dvma_entry_set(index,addr) (iommu_pte[index] = \
49 (addr & IOMMU_ADDR_MASK) | \
50 IOMMU_DT_VALID | IOMMU_CACHE_INHIBIT)
51#else
52#define dvma_entry_set(index,addr) (iommu_pte[index] = \
53 (addr & IOMMU_ADDR_MASK) | \
54 IOMMU_DT_VALID)
55#endif
56#define dvma_entry_clr(index) (iommu_pte[index] = IOMMU_DT_INVALID)
57#define dvma_entry_hash(addr) ((addr >> DVMA_PAGE_SHIFT) ^ \
58 ((addr & 0x03c00000) >> \
59 (DVMA_PAGE_SHIFT+4)))
60
61#undef DEBUG
62
63#ifdef DEBUG
64/* code to print out a dvma mapping for debugging purposes */
65void dvma_print (unsigned long dvma_addr)
66{
67
68 unsigned long index;
69
70 index = dvma_addr >> DVMA_PAGE_SHIFT;
71
72 printk("idx %lx dvma_addr %08lx paddr %08lx\n", index, dvma_addr,
73 dvma_entry_paddr(index));
74
75
76}
77#endif
78
79
80/* create a virtual mapping for a page assigned within the IOMMU
81 so that the cpu can reach it easily */
82inline int dvma_map_cpu(unsigned long kaddr,
83 unsigned long vaddr, int len)
84{
85 pgd_t *pgd;
86 unsigned long end;
87 int ret = 0;
88
89 kaddr &= PAGE_MASK;
90 vaddr &= PAGE_MASK;
91
92 end = PAGE_ALIGN(vaddr + len);
93
94#ifdef DEBUG
95 printk("dvma: mapping kern %08lx to virt %08lx\n",
96 kaddr, vaddr);
97#endif
98 pgd = pgd_offset_k(vaddr);
99
100 do {
101 pmd_t *pmd;
102 unsigned long end2;
103
104 if((pmd = pmd_alloc(&init_mm, pgd, vaddr)) == NULL) {
105 ret = -ENOMEM;
106 goto out;
107 }
108
109 if((end & PGDIR_MASK) > (vaddr & PGDIR_MASK))
110 end2 = (vaddr + (PGDIR_SIZE-1)) & PGDIR_MASK;
111 else
112 end2 = end;
113
114 do {
115 pte_t *pte;
116 unsigned long end3;
117
118 if((pte = pte_alloc_kernel(pmd, vaddr)) == NULL) {
119 ret = -ENOMEM;
120 goto out;
121 }
122
123 if((end2 & PMD_MASK) > (vaddr & PMD_MASK))
124 end3 = (vaddr + (PMD_SIZE-1)) & PMD_MASK;
125 else
126 end3 = end2;
127
128 do {
129#ifdef DEBUG
130 printk("mapping %08lx phys to %08lx\n",
131 __pa(kaddr), vaddr);
132#endif
133 set_pte(pte, pfn_pte(virt_to_pfn(kaddr),
134 PAGE_KERNEL));
135 pte++;
136 kaddr += PAGE_SIZE;
137 vaddr += PAGE_SIZE;
138 } while(vaddr < end3);
139
140 } while(vaddr < end2);
141
142 } while(vaddr < end);
143
144 flush_tlb_all();
145
146 out:
147 return ret;
148}
149
150
151inline int dvma_map_iommu(unsigned long kaddr, unsigned long baddr,
152 int len)
153{
154 unsigned long end, index;
155
156 index = baddr >> DVMA_PAGE_SHIFT;
157 end = ((baddr+len) >> DVMA_PAGE_SHIFT);
158
159 if(len & ~DVMA_PAGE_MASK)
160 end++;
161
162 for(; index < end ; index++) {
163// if(dvma_entry_use(index))
164// BUG();
165// printk("mapping pa %lx to ba %lx\n", __pa(kaddr), index << DVMA_PAGE_SHIFT);
166
167 dvma_entry_set(index, __pa(kaddr));
168
169 iommu_pte[index] |= IOMMU_FULL_BLOCK;
170// dvma_entry_inc(index);
171
172 kaddr += DVMA_PAGE_SIZE;
173 }
174
175#ifdef DEBUG
176 for(index = (baddr >> DVMA_PAGE_SHIFT); index < end; index++)
177 dvma_print(index << DVMA_PAGE_SHIFT);
178#endif
179 return 0;
180
181}
182
183void dvma_unmap_iommu(unsigned long baddr, int len)
184{
185
186 int index, end;
187
188
189 index = baddr >> DVMA_PAGE_SHIFT;
190 end = (DVMA_PAGE_ALIGN(baddr+len) >> DVMA_PAGE_SHIFT);
191
192 for(; index < end ; index++) {
193#ifdef DEBUG
194 printk("freeing bus mapping %08x\n", index << DVMA_PAGE_SHIFT);
195#endif
196#if 0
197 if(!dvma_entry_use(index))
198 printk("dvma_unmap freeing unused entry %04x\n",
199 index);
200 else
201 dvma_entry_dec(index);
202#endif
203 dvma_entry_clr(index);
204 }
205
206}
207
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/vmalloc.h>
19
20#include <asm/sun3x.h>
21#include <asm/dvma.h>
22#include <asm/io.h>
23#include <asm/page.h>
24#include <asm/pgtable.h>
25#include <asm/pgalloc.h>
26
27/* IOMMU support */
28
29#define IOMMU_ADDR_MASK 0x03ffe000
30#define IOMMU_CACHE_INHIBIT 0x00000040
31#define IOMMU_FULL_BLOCK 0x00000020
32#define IOMMU_MODIFIED 0x00000010
33#define IOMMU_USED 0x00000008
34#define IOMMU_WRITE_PROTECT 0x00000004
35#define IOMMU_DT_MASK 0x00000003
36#define IOMMU_DT_INVALID 0x00000000
37#define IOMMU_DT_VALID 0x00000001
38#define IOMMU_DT_BAD 0x00000002
39
40
41static volatile unsigned long *iommu_pte = (unsigned long *)SUN3X_IOMMU;
42
43
44#define dvma_entry_paddr(index) (iommu_pte[index] & IOMMU_ADDR_MASK)
45#define dvma_entry_vaddr(index,paddr) ((index << DVMA_PAGE_SHIFT) | \
46 (paddr & (DVMA_PAGE_SIZE-1)))
47#if 0
48#define dvma_entry_set(index,addr) (iommu_pte[index] = \
49 (addr & IOMMU_ADDR_MASK) | \
50 IOMMU_DT_VALID | IOMMU_CACHE_INHIBIT)
51#else
52#define dvma_entry_set(index,addr) (iommu_pte[index] = \
53 (addr & IOMMU_ADDR_MASK) | \
54 IOMMU_DT_VALID)
55#endif
56#define dvma_entry_clr(index) (iommu_pte[index] = IOMMU_DT_INVALID)
57#define dvma_entry_hash(addr) ((addr >> DVMA_PAGE_SHIFT) ^ \
58 ((addr & 0x03c00000) >> \
59 (DVMA_PAGE_SHIFT+4)))
60
61#undef DEBUG
62
63#ifdef DEBUG
64/* code to print out a dvma mapping for debugging purposes */
65void dvma_print (unsigned long dvma_addr)
66{
67
68 unsigned long index;
69
70 index = dvma_addr >> DVMA_PAGE_SHIFT;
71
72 printk("idx %lx dvma_addr %08lx paddr %08lx\n", index, dvma_addr,
73 dvma_entry_paddr(index));
74
75
76}
77#endif
78
79
80/* create a virtual mapping for a page assigned within the IOMMU
81 so that the cpu can reach it easily */
82inline int dvma_map_cpu(unsigned long kaddr,
83 unsigned long vaddr, int len)
84{
85 pgd_t *pgd;
86 unsigned long end;
87 int ret = 0;
88
89 kaddr &= PAGE_MASK;
90 vaddr &= PAGE_MASK;
91
92 end = PAGE_ALIGN(vaddr + len);
93
94#ifdef DEBUG
95 printk("dvma: mapping kern %08lx to virt %08lx\n",
96 kaddr, vaddr);
97#endif
98 pgd = pgd_offset_k(vaddr);
99
100 do {
101 pmd_t *pmd;
102 unsigned long end2;
103
104 if((pmd = pmd_alloc(&init_mm, pgd, vaddr)) == NULL) {
105 ret = -ENOMEM;
106 goto out;
107 }
108
109 if((end & PGDIR_MASK) > (vaddr & PGDIR_MASK))
110 end2 = (vaddr + (PGDIR_SIZE-1)) & PGDIR_MASK;
111 else
112 end2 = end;
113
114 do {
115 pte_t *pte;
116 unsigned long end3;
117
118 if((pte = pte_alloc_kernel(pmd, vaddr)) == NULL) {
119 ret = -ENOMEM;
120 goto out;
121 }
122
123 if((end2 & PMD_MASK) > (vaddr & PMD_MASK))
124 end3 = (vaddr + (PMD_SIZE-1)) & PMD_MASK;
125 else
126 end3 = end2;
127
128 do {
129#ifdef DEBUG
130 printk("mapping %08lx phys to %08lx\n",
131 __pa(kaddr), vaddr);
132#endif
133 set_pte(pte, pfn_pte(virt_to_pfn(kaddr),
134 PAGE_KERNEL));
135 pte++;
136 kaddr += PAGE_SIZE;
137 vaddr += PAGE_SIZE;
138 } while(vaddr < end3);
139
140 } while(vaddr < end2);
141
142 } while(vaddr < end);
143
144 flush_tlb_all();
145
146 out:
147 return ret;
148}
149
150
151inline int dvma_map_iommu(unsigned long kaddr, unsigned long baddr,
152 int len)
153{
154 unsigned long end, index;
155
156 index = baddr >> DVMA_PAGE_SHIFT;
157 end = ((baddr+len) >> DVMA_PAGE_SHIFT);
158
159 if(len & ~DVMA_PAGE_MASK)
160 end++;
161
162 for(; index < end ; index++) {
163// if(dvma_entry_use(index))
164// BUG();
165// printk("mapping pa %lx to ba %lx\n", __pa(kaddr), index << DVMA_PAGE_SHIFT);
166
167 dvma_entry_set(index, __pa(kaddr));
168
169 iommu_pte[index] |= IOMMU_FULL_BLOCK;
170// dvma_entry_inc(index);
171
172 kaddr += DVMA_PAGE_SIZE;
173 }
174
175#ifdef DEBUG
176 for(index = (baddr >> DVMA_PAGE_SHIFT); index < end; index++)
177 dvma_print(index << DVMA_PAGE_SHIFT);
178#endif
179 return 0;
180
181}
182
183void dvma_unmap_iommu(unsigned long baddr, int len)
184{
185
186 int index, end;
187
188
189 index = baddr >> DVMA_PAGE_SHIFT;
190 end = (DVMA_PAGE_ALIGN(baddr+len) >> DVMA_PAGE_SHIFT);
191
192 for(; index < end ; index++) {
193#ifdef DEBUG
194 printk("freeing bus mapping %08x\n", index << DVMA_PAGE_SHIFT);
195#endif
196#if 0
197 if(!dvma_entry_use(index))
198 printk("dvma_unmap freeing unused entry %04x\n",
199 index);
200 else
201 dvma_entry_dec(index);
202#endif
203 dvma_entry_clr(index);
204 }
205
206}
207