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1da177e4 LT |
1 | /* $Id: io-unit.c,v 1.24 2001/12/17 07:05:09 davem Exp $ |
2 | * io-unit.c: IO-UNIT specific routines for memory management. | |
3 | * | |
4 | * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
5 | */ | |
6 | ||
1da177e4 LT |
7 | #include <linux/kernel.h> |
8 | #include <linux/init.h> | |
9 | #include <linux/slab.h> | |
10 | #include <linux/spinlock.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/highmem.h> /* pte_offset_map => kmap_atomic */ | |
13 | #include <linux/bitops.h> | |
14 | ||
15 | #include <asm/scatterlist.h> | |
16 | #include <asm/pgalloc.h> | |
17 | #include <asm/pgtable.h> | |
18 | #include <asm/sbus.h> | |
19 | #include <asm/io.h> | |
20 | #include <asm/io-unit.h> | |
21 | #include <asm/mxcc.h> | |
22 | #include <asm/cacheflush.h> | |
23 | #include <asm/tlbflush.h> | |
24 | #include <asm/dma.h> | |
d4accd60 | 25 | #include <asm/oplib.h> |
1da177e4 LT |
26 | |
27 | /* #define IOUNIT_DEBUG */ | |
28 | #ifdef IOUNIT_DEBUG | |
29 | #define IOD(x) printk(x) | |
30 | #else | |
31 | #define IOD(x) do { } while (0) | |
32 | #endif | |
33 | ||
34 | #define IOPERM (IOUPTE_CACHE | IOUPTE_WRITE | IOUPTE_VALID) | |
35 | #define MKIOPTE(phys) __iopte((((phys)>>4) & IOUPTE_PAGE) | IOPERM) | |
36 | ||
37 | void __init | |
38 | iounit_init(int sbi_node, int io_node, struct sbus_bus *sbus) | |
39 | { | |
40 | iopte_t *xpt, *xptend; | |
41 | struct iounit_struct *iounit; | |
42 | struct linux_prom_registers iommu_promregs[PROMREG_MAX]; | |
43 | struct resource r; | |
44 | ||
c80892d1 | 45 | iounit = kzalloc(sizeof(struct iounit_struct), GFP_ATOMIC); |
d4accd60 DM |
46 | if (!iounit) { |
47 | prom_printf("SUN4D: Cannot alloc iounit, halting.\n"); | |
48 | prom_halt(); | |
49 | } | |
1da177e4 | 50 | |
1da177e4 LT |
51 | iounit->limit[0] = IOUNIT_BMAP1_START; |
52 | iounit->limit[1] = IOUNIT_BMAP2_START; | |
53 | iounit->limit[2] = IOUNIT_BMAPM_START; | |
54 | iounit->limit[3] = IOUNIT_BMAPM_END; | |
55 | iounit->rotor[1] = IOUNIT_BMAP2_START; | |
56 | iounit->rotor[2] = IOUNIT_BMAPM_START; | |
57 | ||
58 | xpt = NULL; | |
59 | if(prom_getproperty(sbi_node, "reg", (void *) iommu_promregs, | |
60 | sizeof(iommu_promregs)) != -1) { | |
61 | prom_apply_generic_ranges(io_node, 0, iommu_promregs, 3); | |
62 | memset(&r, 0, sizeof(r)); | |
63 | r.flags = iommu_promregs[2].which_io; | |
64 | r.start = iommu_promregs[2].phys_addr; | |
65 | xpt = (iopte_t *) sbus_ioremap(&r, 0, PAGE_SIZE * 16, "XPT"); | |
66 | } | |
67 | if(!xpt) panic("Cannot map External Page Table."); | |
68 | ||
3ac4c949 | 69 | sbus->ofdev.dev.archdata.iommu = iounit; |
1da177e4 | 70 | iounit->page_table = xpt; |
2f72ba43 | 71 | spin_lock_init(&iounit->lock); |
1da177e4 LT |
72 | |
73 | for (xptend = iounit->page_table + (16 * PAGE_SIZE) / sizeof(iopte_t); | |
74 | xpt < xptend;) | |
75 | iopte_val(*xpt++) = 0; | |
76 | } | |
77 | ||
78 | /* One has to hold iounit->lock to call this */ | |
79 | static unsigned long iounit_get_area(struct iounit_struct *iounit, unsigned long vaddr, int size) | |
80 | { | |
81 | int i, j, k, npages; | |
82 | unsigned long rotor, scan, limit; | |
83 | iopte_t iopte; | |
84 | ||
85 | npages = ((vaddr & ~PAGE_MASK) + size + (PAGE_SIZE-1)) >> PAGE_SHIFT; | |
86 | ||
87 | /* A tiny bit of magic ingredience :) */ | |
88 | switch (npages) { | |
89 | case 1: i = 0x0231; break; | |
90 | case 2: i = 0x0132; break; | |
91 | default: i = 0x0213; break; | |
92 | } | |
93 | ||
94 | IOD(("iounit_get_area(%08lx,%d[%d])=", vaddr, size, npages)); | |
95 | ||
96 | next: j = (i & 15); | |
97 | rotor = iounit->rotor[j - 1]; | |
98 | limit = iounit->limit[j]; | |
99 | scan = rotor; | |
100 | nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan); | |
101 | if (scan + npages > limit) { | |
102 | if (limit != rotor) { | |
103 | limit = rotor; | |
104 | scan = iounit->limit[j - 1]; | |
105 | goto nexti; | |
106 | } | |
107 | i >>= 4; | |
108 | if (!(i & 15)) | |
109 | panic("iounit_get_area: Couldn't find free iopte slots for (%08lx,%d)\n", vaddr, size); | |
110 | goto next; | |
111 | } | |
112 | for (k = 1, scan++; k < npages; k++) | |
113 | if (test_bit(scan++, iounit->bmap)) | |
114 | goto nexti; | |
115 | iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1]; | |
116 | scan -= npages; | |
117 | iopte = MKIOPTE(__pa(vaddr & PAGE_MASK)); | |
118 | vaddr = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT) + (vaddr & ~PAGE_MASK); | |
119 | for (k = 0; k < npages; k++, iopte = __iopte(iopte_val(iopte) + 0x100), scan++) { | |
120 | set_bit(scan, iounit->bmap); | |
121 | iounit->page_table[scan] = iopte; | |
122 | } | |
123 | IOD(("%08lx\n", vaddr)); | |
124 | return vaddr; | |
125 | } | |
126 | ||
127 | static __u32 iounit_get_scsi_one(char *vaddr, unsigned long len, struct sbus_bus *sbus) | |
128 | { | |
129 | unsigned long ret, flags; | |
3ac4c949 | 130 | struct iounit_struct *iounit = sbus->ofdev.dev.archdata.iommu; |
1da177e4 LT |
131 | |
132 | spin_lock_irqsave(&iounit->lock, flags); | |
133 | ret = iounit_get_area(iounit, (unsigned long)vaddr, len); | |
134 | spin_unlock_irqrestore(&iounit->lock, flags); | |
135 | return ret; | |
136 | } | |
137 | ||
138 | static void iounit_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus) | |
139 | { | |
140 | unsigned long flags; | |
3ac4c949 | 141 | struct iounit_struct *iounit = sbus->ofdev.dev.archdata.iommu; |
1da177e4 LT |
142 | |
143 | /* FIXME: Cache some resolved pages - often several sg entries are to the same page */ | |
144 | spin_lock_irqsave(&iounit->lock, flags); | |
145 | while (sz != 0) { | |
146 | --sz; | |
147 | sg[sz].dvma_address = iounit_get_area(iounit, (unsigned long)page_address(sg[sz].page) + sg[sz].offset, sg[sz].length); | |
148 | sg[sz].dvma_length = sg[sz].length; | |
149 | } | |
150 | spin_unlock_irqrestore(&iounit->lock, flags); | |
151 | } | |
152 | ||
153 | static void iounit_release_scsi_one(__u32 vaddr, unsigned long len, struct sbus_bus *sbus) | |
154 | { | |
155 | unsigned long flags; | |
3ac4c949 | 156 | struct iounit_struct *iounit = sbus->ofdev.dev.archdata.iommu; |
1da177e4 LT |
157 | |
158 | spin_lock_irqsave(&iounit->lock, flags); | |
159 | len = ((vaddr & ~PAGE_MASK) + len + (PAGE_SIZE-1)) >> PAGE_SHIFT; | |
160 | vaddr = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT; | |
161 | IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr)); | |
162 | for (len += vaddr; vaddr < len; vaddr++) | |
163 | clear_bit(vaddr, iounit->bmap); | |
164 | spin_unlock_irqrestore(&iounit->lock, flags); | |
165 | } | |
166 | ||
167 | static void iounit_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus) | |
168 | { | |
169 | unsigned long flags; | |
170 | unsigned long vaddr, len; | |
3ac4c949 | 171 | struct iounit_struct *iounit = sbus->ofdev.dev.archdata.iommu; |
1da177e4 LT |
172 | |
173 | spin_lock_irqsave(&iounit->lock, flags); | |
174 | while (sz != 0) { | |
175 | --sz; | |
176 | len = ((sg[sz].dvma_address & ~PAGE_MASK) + sg[sz].length + (PAGE_SIZE-1)) >> PAGE_SHIFT; | |
177 | vaddr = (sg[sz].dvma_address - IOUNIT_DMA_BASE) >> PAGE_SHIFT; | |
178 | IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr)); | |
179 | for (len += vaddr; vaddr < len; vaddr++) | |
180 | clear_bit(vaddr, iounit->bmap); | |
181 | } | |
182 | spin_unlock_irqrestore(&iounit->lock, flags); | |
183 | } | |
184 | ||
185 | #ifdef CONFIG_SBUS | |
186 | static int iounit_map_dma_area(dma_addr_t *pba, unsigned long va, __u32 addr, int len) | |
187 | { | |
188 | unsigned long page, end; | |
189 | pgprot_t dvma_prot; | |
190 | iopte_t *iopte; | |
191 | struct sbus_bus *sbus; | |
192 | ||
193 | *pba = addr; | |
194 | ||
195 | dvma_prot = __pgprot(SRMMU_CACHE | SRMMU_ET_PTE | SRMMU_PRIV); | |
196 | end = PAGE_ALIGN((addr + len)); | |
197 | while(addr < end) { | |
198 | page = va; | |
199 | { | |
200 | pgd_t *pgdp; | |
201 | pmd_t *pmdp; | |
202 | pte_t *ptep; | |
203 | long i; | |
204 | ||
205 | pgdp = pgd_offset(&init_mm, addr); | |
206 | pmdp = pmd_offset(pgdp, addr); | |
207 | ptep = pte_offset_map(pmdp, addr); | |
208 | ||
209 | set_pte(ptep, mk_pte(virt_to_page(page), dvma_prot)); | |
210 | ||
211 | i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT); | |
212 | ||
213 | for_each_sbus(sbus) { | |
3ac4c949 | 214 | struct iounit_struct *iounit = sbus->ofdev.dev.archdata.iommu; |
1da177e4 LT |
215 | |
216 | iopte = (iopte_t *)(iounit->page_table + i); | |
217 | *iopte = MKIOPTE(__pa(page)); | |
218 | } | |
219 | } | |
220 | addr += PAGE_SIZE; | |
221 | va += PAGE_SIZE; | |
222 | } | |
223 | flush_cache_all(); | |
224 | flush_tlb_all(); | |
225 | ||
226 | return 0; | |
227 | } | |
228 | ||
229 | static void iounit_unmap_dma_area(unsigned long addr, int len) | |
230 | { | |
231 | /* XXX Somebody please fill this in */ | |
232 | } | |
233 | ||
234 | /* XXX We do not pass sbus device here, bad. */ | |
235 | static struct page *iounit_translate_dvma(unsigned long addr) | |
236 | { | |
237 | struct sbus_bus *sbus = sbus_root; /* They are all the same */ | |
3ac4c949 | 238 | struct iounit_struct *iounit = sbus->ofdev.dev.archdata.iommu; |
1da177e4 LT |
239 | int i; |
240 | iopte_t *iopte; | |
241 | ||
242 | i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT); | |
243 | iopte = (iopte_t *)(iounit->page_table + i); | |
244 | return pfn_to_page(iopte_val(*iopte) >> (PAGE_SHIFT-4)); /* XXX sun4d guru, help */ | |
245 | } | |
246 | #endif | |
247 | ||
248 | static char *iounit_lockarea(char *vaddr, unsigned long len) | |
249 | { | |
250 | /* FIXME: Write this */ | |
251 | return vaddr; | |
252 | } | |
253 | ||
254 | static void iounit_unlockarea(char *vaddr, unsigned long len) | |
255 | { | |
256 | /* FIXME: Write this */ | |
257 | } | |
258 | ||
259 | void __init ld_mmu_iounit(void) | |
260 | { | |
261 | BTFIXUPSET_CALL(mmu_lockarea, iounit_lockarea, BTFIXUPCALL_RETO0); | |
262 | BTFIXUPSET_CALL(mmu_unlockarea, iounit_unlockarea, BTFIXUPCALL_NOP); | |
263 | ||
264 | BTFIXUPSET_CALL(mmu_get_scsi_one, iounit_get_scsi_one, BTFIXUPCALL_NORM); | |
265 | BTFIXUPSET_CALL(mmu_get_scsi_sgl, iounit_get_scsi_sgl, BTFIXUPCALL_NORM); | |
266 | BTFIXUPSET_CALL(mmu_release_scsi_one, iounit_release_scsi_one, BTFIXUPCALL_NORM); | |
267 | BTFIXUPSET_CALL(mmu_release_scsi_sgl, iounit_release_scsi_sgl, BTFIXUPCALL_NORM); | |
268 | ||
269 | #ifdef CONFIG_SBUS | |
270 | BTFIXUPSET_CALL(mmu_map_dma_area, iounit_map_dma_area, BTFIXUPCALL_NORM); | |
271 | BTFIXUPSET_CALL(mmu_unmap_dma_area, iounit_unmap_dma_area, BTFIXUPCALL_NORM); | |
272 | BTFIXUPSET_CALL(mmu_translate_dvma, iounit_translate_dvma, BTFIXUPCALL_NORM); | |
273 | #endif | |
274 | } | |
275 | ||
276 | __u32 iounit_map_dma_init(struct sbus_bus *sbus, int size) | |
277 | { | |
278 | int i, j, k, npages; | |
279 | unsigned long rotor, scan, limit; | |
280 | unsigned long flags; | |
281 | __u32 ret; | |
3ac4c949 | 282 | struct iounit_struct *iounit = sbus->ofdev.dev.archdata.iommu; |
1da177e4 LT |
283 | |
284 | npages = (size + (PAGE_SIZE-1)) >> PAGE_SHIFT; | |
285 | i = 0x0213; | |
286 | spin_lock_irqsave(&iounit->lock, flags); | |
287 | next: j = (i & 15); | |
288 | rotor = iounit->rotor[j - 1]; | |
289 | limit = iounit->limit[j]; | |
290 | scan = rotor; | |
291 | nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan); | |
292 | if (scan + npages > limit) { | |
293 | if (limit != rotor) { | |
294 | limit = rotor; | |
295 | scan = iounit->limit[j - 1]; | |
296 | goto nexti; | |
297 | } | |
298 | i >>= 4; | |
299 | if (!(i & 15)) | |
300 | panic("iounit_map_dma_init: Couldn't find free iopte slots for %d bytes\n", size); | |
301 | goto next; | |
302 | } | |
303 | for (k = 1, scan++; k < npages; k++) | |
304 | if (test_bit(scan++, iounit->bmap)) | |
305 | goto nexti; | |
306 | iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1]; | |
307 | scan -= npages; | |
308 | ret = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT); | |
309 | for (k = 0; k < npages; k++, scan++) | |
310 | set_bit(scan, iounit->bmap); | |
311 | spin_unlock_irqrestore(&iounit->lock, flags); | |
312 | return ret; | |
313 | } | |
314 | ||
315 | __u32 iounit_map_dma_page(__u32 vaddr, void *addr, struct sbus_bus *sbus) | |
316 | { | |
317 | int scan = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT; | |
3ac4c949 | 318 | struct iounit_struct *iounit = sbus->ofdev.dev.archdata.iommu; |
1da177e4 LT |
319 | |
320 | iounit->page_table[scan] = MKIOPTE(__pa(((unsigned long)addr) & PAGE_MASK)); | |
321 | return vaddr + (((unsigned long)addr) & ~PAGE_MASK); | |
322 | } |