File: /usr/src/linux/arch/sparc/mm/io-unit.c
1 /* $Id: io-unit.c,v 1.23 2001/02/13 01:16:43 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
7 #include <linux/config.h>
8 #include <linux/kernel.h>
9 #include <linux/init.h>
10 #include <linux/slab.h>
11 #include <linux/spinlock.h>
12 #include <asm/scatterlist.h>
13 #include <asm/pgalloc.h>
14 #include <asm/pgtable.h>
15 #include <asm/sbus.h>
16 #include <asm/io.h>
17 #include <asm/io-unit.h>
18 #include <asm/mxcc.h>
19 #include <asm/bitops.h>
20
21 /* #define IOUNIT_DEBUG */
22 #ifdef IOUNIT_DEBUG
23 #define IOD(x) printk(x)
24 #else
25 #define IOD(x) do { } while (0)
26 #endif
27
28 #define IOPERM (IOUPTE_CACHE | IOUPTE_WRITE | IOUPTE_VALID)
29 #define MKIOPTE(phys) __iopte((((phys)>>4) & IOUPTE_PAGE) | IOPERM)
30
31 void __init
32 iounit_init(int sbi_node, int io_node, struct sbus_bus *sbus)
33 {
34 iopte_t *xpt, *xptend;
35 struct iounit_struct *iounit;
36 struct linux_prom_registers iommu_promregs[PROMREG_MAX];
37 struct resource r;
38
39 iounit = kmalloc(sizeof(struct iounit_struct), GFP_ATOMIC);
40
41 memset(iounit, 0, sizeof(*iounit));
42 iounit->limit[0] = IOUNIT_BMAP1_START;
43 iounit->limit[1] = IOUNIT_BMAP2_START;
44 iounit->limit[2] = IOUNIT_BMAPM_START;
45 iounit->limit[3] = IOUNIT_BMAPM_END;
46 iounit->rotor[1] = IOUNIT_BMAP2_START;
47 iounit->rotor[2] = IOUNIT_BMAPM_START;
48
49 prom_getproperty(sbi_node, "reg", (void *) iommu_promregs,
50 sizeof(iommu_promregs));
51 prom_apply_generic_ranges(io_node, 0, iommu_promregs, 3);
52 memset(&r, 0, sizeof(r));
53 r.flags = iommu_promregs[2].which_io;
54 r.start = iommu_promregs[2].phys_addr;
55 xpt = (iopte_t *) sbus_ioremap(&r, 0, PAGE_SIZE * 16, "XPT");
56 if(!xpt) panic("Cannot map External Page Table.");
57
58 sbus->iommu = (struct iommu_struct *)iounit;
59 iounit->page_table = xpt;
60
61 for (xptend = iounit->page_table + (16 * PAGE_SIZE) / sizeof(iopte_t);
62 xpt < xptend;)
63 *xpt++ = 0;
64 }
65
66 /* One has to hold iounit->lock to call this */
67 static unsigned long iounit_get_area(struct iounit_struct *iounit, unsigned long vaddr, int size)
68 {
69 int i, j, k, npages;
70 unsigned long rotor, scan, limit;
71 iopte_t iopte;
72
73 npages = ((vaddr & ~PAGE_MASK) + size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
74
75 /* A tiny bit of magic ingredience :) */
76 switch (npages) {
77 case 1: i = 0x0231; break;
78 case 2: i = 0x0132; break;
79 default: i = 0x0213; break;
80 }
81
82 IOD(("iounit_get_area(%08lx,%d[%d])=", vaddr, size, npages));
83
84 next: j = (i & 15);
85 rotor = iounit->rotor[j - 1];
86 limit = iounit->limit[j];
87 scan = rotor;
88 nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan);
89 if (scan + npages > limit) {
90 if (limit != rotor) {
91 limit = rotor;
92 scan = iounit->limit[j - 1];
93 goto nexti;
94 }
95 i >>= 4;
96 if (!(i & 15))
97 panic("iounit_get_area: Couldn't find free iopte slots for (%08lx,%d)\n", vaddr, size);
98 goto next;
99 }
100 for (k = 1, scan++; k < npages; k++)
101 if (test_bit(scan++, iounit->bmap))
102 goto nexti;
103 iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1];
104 scan -= npages;
105 iopte = MKIOPTE(__pa(vaddr & PAGE_MASK));
106 vaddr = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT) + (vaddr & ~PAGE_MASK);
107 for (k = 0; k < npages; k++, iopte = __iopte(iopte_val(iopte) + 0x100), scan++) {
108 set_bit(scan, iounit->bmap);
109 iounit->page_table[scan] = iopte;
110 }
111 IOD(("%08lx\n", vaddr));
112 return vaddr;
113 }
114
115 static __u32 iounit_get_scsi_one(char *vaddr, unsigned long len, struct sbus_bus *sbus)
116 {
117 unsigned long ret, flags;
118 struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
119
120 spin_lock_irqsave(&iounit->lock, flags);
121 ret = iounit_get_area(iounit, (unsigned long)vaddr, len);
122 spin_unlock_irqrestore(&iounit->lock, flags);
123 return ret;
124 }
125
126 static void iounit_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
127 {
128 unsigned long flags;
129 struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
130
131 /* FIXME: Cache some resolved pages - often several sg entries are to the same page */
132 spin_lock_irqsave(&iounit->lock, flags);
133 for (; sz >= 0; sz--) {
134 sg[sz].dvma_address = iounit_get_area(iounit, (unsigned long)sg[sz].address, sg[sz].length);
135 sg[sz].dvma_length = sg[sz].length;
136 }
137 spin_unlock_irqrestore(&iounit->lock, flags);
138 }
139
140 static void iounit_release_scsi_one(__u32 vaddr, unsigned long len, struct sbus_bus *sbus)
141 {
142 unsigned long flags;
143 struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
144
145 spin_lock_irqsave(&iounit->lock, flags);
146 len = ((vaddr & ~PAGE_MASK) + len + (PAGE_SIZE-1)) >> PAGE_SHIFT;
147 vaddr = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
148 IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
149 for (len += vaddr; vaddr < len; vaddr++)
150 clear_bit(vaddr, iounit->bmap);
151 spin_unlock_irqrestore(&iounit->lock, flags);
152 }
153
154 static void iounit_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
155 {
156 unsigned long flags;
157 unsigned long vaddr, len;
158 struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
159
160 spin_lock_irqsave(&iounit->lock, flags);
161 for (; sz >= 0; sz--) {
162 len = ((sg[sz].dvma_address & ~PAGE_MASK) + sg[sz].length + (PAGE_SIZE-1)) >> PAGE_SHIFT;
163 vaddr = (sg[sz].dvma_address - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
164 IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
165 for (len += vaddr; vaddr < len; vaddr++)
166 clear_bit(vaddr, iounit->bmap);
167 }
168 spin_unlock_irqrestore(&iounit->lock, flags);
169 }
170
171 #ifdef CONFIG_SBUS
172 static void iounit_map_dma_area(unsigned long va, __u32 addr, int len)
173 {
174 unsigned long page, end;
175 pgprot_t dvma_prot;
176 iopte_t *iopte;
177 struct sbus_bus *sbus;
178
179 dvma_prot = __pgprot(SRMMU_CACHE | SRMMU_ET_PTE | SRMMU_PRIV);
180 end = PAGE_ALIGN((addr + len));
181 while(addr < end) {
182 page = va;
183 {
184 pgd_t *pgdp;
185 pmd_t *pmdp;
186 pte_t *ptep;
187 long i;
188
189 pgdp = pgd_offset(init_task.mm, addr);
190 pmdp = pmd_offset(pgdp, addr);
191 ptep = pte_offset(pmdp, addr);
192
193 set_pte(ptep, pte_val(mk_pte(virt_to_page(page), dvma_prot)));
194
195 i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT);
196
197 for_each_sbus(sbus) {
198 struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
199
200 iopte = (iopte_t *)(iounit->page_table + i);
201 *iopte = __iopte(MKIOPTE(__pa(page)));
202 }
203 }
204 addr += PAGE_SIZE;
205 va += PAGE_SIZE;
206 }
207 flush_cache_all();
208 flush_tlb_all();
209 }
210
211 static void iounit_unmap_dma_area(unsigned long addr, int len)
212 {
213 /* XXX Somebody please fill this in */
214 }
215
216 /* XXX We do not pass sbus device here, bad. */
217 static unsigned long iounit_translate_dvma(unsigned long addr)
218 {
219 struct sbus_bus *sbus = sbus_root; /* They are all the same */
220 struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
221 int i;
222 iopte_t *iopte;
223
224 i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT);
225 iopte = (iopte_t *)(iounit->page_table + i);
226 return (iopte_val(*iopte) & 0xFFFFFFF0) << 4; /* XXX sun4d guru, help */
227 }
228 #endif
229
230 static char *iounit_lockarea(char *vaddr, unsigned long len)
231 {
232 /* FIXME: Write this */
233 return vaddr;
234 }
235
236 static void iounit_unlockarea(char *vaddr, unsigned long len)
237 {
238 /* FIXME: Write this */
239 }
240
241 void __init ld_mmu_iounit(void)
242 {
243 BTFIXUPSET_CALL(mmu_lockarea, iounit_lockarea, BTFIXUPCALL_RETO0);
244 BTFIXUPSET_CALL(mmu_unlockarea, iounit_unlockarea, BTFIXUPCALL_NOP);
245
246 BTFIXUPSET_CALL(mmu_get_scsi_one, iounit_get_scsi_one, BTFIXUPCALL_NORM);
247 BTFIXUPSET_CALL(mmu_get_scsi_sgl, iounit_get_scsi_sgl, BTFIXUPCALL_NORM);
248 BTFIXUPSET_CALL(mmu_release_scsi_one, iounit_release_scsi_one, BTFIXUPCALL_NORM);
249 BTFIXUPSET_CALL(mmu_release_scsi_sgl, iounit_release_scsi_sgl, BTFIXUPCALL_NORM);
250
251 #ifdef CONFIG_SBUS
252 BTFIXUPSET_CALL(mmu_map_dma_area, iounit_map_dma_area, BTFIXUPCALL_NORM);
253 BTFIXUPSET_CALL(mmu_unmap_dma_area, iounit_unmap_dma_area, BTFIXUPCALL_NORM);
254 BTFIXUPSET_CALL(mmu_translate_dvma, iounit_translate_dvma, BTFIXUPCALL_NORM);
255 #endif
256 }
257
258 __u32 iounit_map_dma_init(struct sbus_bus *sbus, int size)
259 {
260 int i, j, k, npages;
261 unsigned long rotor, scan, limit;
262 unsigned long flags;
263 __u32 ret;
264 struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
265
266 npages = (size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
267 i = 0x0213;
268 spin_lock_irqsave(&iounit->lock, flags);
269 next: j = (i & 15);
270 rotor = iounit->rotor[j - 1];
271 limit = iounit->limit[j];
272 scan = rotor;
273 nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan);
274 if (scan + npages > limit) {
275 if (limit != rotor) {
276 limit = rotor;
277 scan = iounit->limit[j - 1];
278 goto nexti;
279 }
280 i >>= 4;
281 if (!(i & 15))
282 panic("iounit_map_dma_init: Couldn't find free iopte slots for %d bytes\n", size);
283 goto next;
284 }
285 for (k = 1, scan++; k < npages; k++)
286 if (test_bit(scan++, iounit->bmap))
287 goto nexti;
288 iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1];
289 scan -= npages;
290 ret = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT);
291 for (k = 0; k < npages; k++, scan++)
292 set_bit(scan, iounit->bmap);
293 spin_unlock_irqrestore(&iounit->lock, flags);
294 return ret;
295 }
296
297 __u32 iounit_map_dma_page(__u32 vaddr, void *addr, struct sbus_bus *sbus)
298 {
299 int scan = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
300 struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
301
302 iounit->page_table[scan] = MKIOPTE(__pa(((unsigned long)addr) & PAGE_MASK));
303 return vaddr + (((unsigned long)addr) & ~PAGE_MASK);
304 }
305