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1// SPDX-License-Identifier: GPL-2.0
2/*
3** PARISC 1.1 Dynamic DMA mapping support.
4** This implementation is for PA-RISC platforms that do not support
5** I/O TLBs (aka DMA address translation hardware).
6** See Documentation/DMA-API-HOWTO.txt for interface definitions.
7**
8** (c) Copyright 1999,2000 Hewlett-Packard Company
9** (c) Copyright 2000 Grant Grundler
10** (c) Copyright 2000 Philipp Rumpf <prumpf@tux.org>
11** (c) Copyright 2000 John Marvin
12**
13** "leveraged" from 2.3.47: arch/ia64/kernel/pci-dma.c.
14** (I assume it's from David Mosberger-Tang but there was no Copyright)
15**
16** AFAIK, all PA7100LC and PA7300LC platforms can use this code.
17**
18** - ggg
19*/
20
21#include <linux/init.h>
22#include <linux/gfp.h>
23#include <linux/mm.h>
24#include <linux/proc_fs.h>
25#include <linux/seq_file.h>
26#include <linux/string.h>
27#include <linux/types.h>
28#include <linux/dma-direct.h>
29#include <linux/dma-noncoherent.h>
30
31#include <asm/cacheflush.h>
32#include <asm/dma.h> /* for DMA_CHUNK_SIZE */
33#include <asm/io.h>
34#include <asm/page.h> /* get_order */
35#include <asm/pgalloc.h>
36#include <linux/uaccess.h>
37#include <asm/tlbflush.h> /* for purge_tlb_*() macros */
38
39static struct proc_dir_entry * proc_gsc_root __read_mostly = NULL;
40static unsigned long pcxl_used_bytes __read_mostly = 0;
41static unsigned long pcxl_used_pages __read_mostly = 0;
42
43extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */
44static DEFINE_SPINLOCK(pcxl_res_lock);
45static char *pcxl_res_map;
46static int pcxl_res_hint;
47static int pcxl_res_size;
48
49#ifdef DEBUG_PCXL_RESOURCE
50#define DBG_RES(x...) printk(x)
51#else
52#define DBG_RES(x...)
53#endif
54
55
56/*
57** Dump a hex representation of the resource map.
58*/
59
60#ifdef DUMP_RESMAP
61static
62void dump_resmap(void)
63{
64 u_long *res_ptr = (unsigned long *)pcxl_res_map;
65 u_long i = 0;
66
67 printk("res_map: ");
68 for(; i < (pcxl_res_size / sizeof(unsigned long)); ++i, ++res_ptr)
69 printk("%08lx ", *res_ptr);
70
71 printk("\n");
72}
73#else
74static inline void dump_resmap(void) {;}
75#endif
76
77static inline int map_pte_uncached(pte_t * pte,
78 unsigned long vaddr,
79 unsigned long size, unsigned long *paddr_ptr)
80{
81 unsigned long end;
82 unsigned long orig_vaddr = vaddr;
83
84 vaddr &= ~PMD_MASK;
85 end = vaddr + size;
86 if (end > PMD_SIZE)
87 end = PMD_SIZE;
88 do {
89 unsigned long flags;
90
91 if (!pte_none(*pte))
92 printk(KERN_ERR "map_pte_uncached: page already exists\n");
93 purge_tlb_start(flags);
94 set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC));
95 pdtlb_kernel(orig_vaddr);
96 purge_tlb_end(flags);
97 vaddr += PAGE_SIZE;
98 orig_vaddr += PAGE_SIZE;
99 (*paddr_ptr) += PAGE_SIZE;
100 pte++;
101 } while (vaddr < end);
102 return 0;
103}
104
105static inline int map_pmd_uncached(pmd_t * pmd, unsigned long vaddr,
106 unsigned long size, unsigned long *paddr_ptr)
107{
108 unsigned long end;
109 unsigned long orig_vaddr = vaddr;
110
111 vaddr &= ~PGDIR_MASK;
112 end = vaddr + size;
113 if (end > PGDIR_SIZE)
114 end = PGDIR_SIZE;
115 do {
116 pte_t * pte = pte_alloc_kernel(pmd, vaddr);
117 if (!pte)
118 return -ENOMEM;
119 if (map_pte_uncached(pte, orig_vaddr, end - vaddr, paddr_ptr))
120 return -ENOMEM;
121 vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
122 orig_vaddr += PMD_SIZE;
123 pmd++;
124 } while (vaddr < end);
125 return 0;
126}
127
128static inline int map_uncached_pages(unsigned long vaddr, unsigned long size,
129 unsigned long paddr)
130{
131 pgd_t * dir;
132 unsigned long end = vaddr + size;
133
134 dir = pgd_offset_k(vaddr);
135 do {
136 pmd_t *pmd;
137
138 pmd = pmd_alloc(NULL, dir, vaddr);
139 if (!pmd)
140 return -ENOMEM;
141 if (map_pmd_uncached(pmd, vaddr, end - vaddr, &paddr))
142 return -ENOMEM;
143 vaddr = vaddr + PGDIR_SIZE;
144 dir++;
145 } while (vaddr && (vaddr < end));
146 return 0;
147}
148
149static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr,
150 unsigned long size)
151{
152 pte_t * pte;
153 unsigned long end;
154 unsigned long orig_vaddr = vaddr;
155
156 if (pmd_none(*pmd))
157 return;
158 if (pmd_bad(*pmd)) {
159 pmd_ERROR(*pmd);
160 pmd_clear(pmd);
161 return;
162 }
163 pte = pte_offset_map(pmd, vaddr);
164 vaddr &= ~PMD_MASK;
165 end = vaddr + size;
166 if (end > PMD_SIZE)
167 end = PMD_SIZE;
168 do {
169 unsigned long flags;
170 pte_t page = *pte;
171
172 pte_clear(&init_mm, vaddr, pte);
173 purge_tlb_start(flags);
174 pdtlb_kernel(orig_vaddr);
175 purge_tlb_end(flags);
176 vaddr += PAGE_SIZE;
177 orig_vaddr += PAGE_SIZE;
178 pte++;
179 if (pte_none(page) || pte_present(page))
180 continue;
181 printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n");
182 } while (vaddr < end);
183}
184
185static inline void unmap_uncached_pmd(pgd_t * dir, unsigned long vaddr,
186 unsigned long size)
187{
188 pmd_t * pmd;
189 unsigned long end;
190 unsigned long orig_vaddr = vaddr;
191
192 if (pgd_none(*dir))
193 return;
194 if (pgd_bad(*dir)) {
195 pgd_ERROR(*dir);
196 pgd_clear(dir);
197 return;
198 }
199 pmd = pmd_offset(dir, vaddr);
200 vaddr &= ~PGDIR_MASK;
201 end = vaddr + size;
202 if (end > PGDIR_SIZE)
203 end = PGDIR_SIZE;
204 do {
205 unmap_uncached_pte(pmd, orig_vaddr, end - vaddr);
206 vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
207 orig_vaddr += PMD_SIZE;
208 pmd++;
209 } while (vaddr < end);
210}
211
212static void unmap_uncached_pages(unsigned long vaddr, unsigned long size)
213{
214 pgd_t * dir;
215 unsigned long end = vaddr + size;
216
217 dir = pgd_offset_k(vaddr);
218 do {
219 unmap_uncached_pmd(dir, vaddr, end - vaddr);
220 vaddr = vaddr + PGDIR_SIZE;
221 dir++;
222 } while (vaddr && (vaddr < end));
223}
224
225#define PCXL_SEARCH_LOOP(idx, mask, size) \
226 for(; res_ptr < res_end; ++res_ptr) \
227 { \
228 if(0 == ((*res_ptr) & mask)) { \
229 *res_ptr |= mask; \
230 idx = (int)((u_long)res_ptr - (u_long)pcxl_res_map); \
231 pcxl_res_hint = idx + (size >> 3); \
232 goto resource_found; \
233 } \
234 }
235
236#define PCXL_FIND_FREE_MAPPING(idx, mask, size) { \
237 u##size *res_ptr = (u##size *)&(pcxl_res_map[pcxl_res_hint & ~((size >> 3) - 1)]); \
238 u##size *res_end = (u##size *)&pcxl_res_map[pcxl_res_size]; \
239 PCXL_SEARCH_LOOP(idx, mask, size); \
240 res_ptr = (u##size *)&pcxl_res_map[0]; \
241 PCXL_SEARCH_LOOP(idx, mask, size); \
242}
243
244unsigned long
245pcxl_alloc_range(size_t size)
246{
247 int res_idx;
248 u_long mask, flags;
249 unsigned int pages_needed = size >> PAGE_SHIFT;
250
251 mask = (u_long) -1L;
252 mask >>= BITS_PER_LONG - pages_needed;
253
254 DBG_RES("pcxl_alloc_range() size: %d pages_needed %d pages_mask 0x%08lx\n",
255 size, pages_needed, mask);
256
257 spin_lock_irqsave(&pcxl_res_lock, flags);
258
259 if(pages_needed <= 8) {
260 PCXL_FIND_FREE_MAPPING(res_idx, mask, 8);
261 } else if(pages_needed <= 16) {
262 PCXL_FIND_FREE_MAPPING(res_idx, mask, 16);
263 } else if(pages_needed <= 32) {
264 PCXL_FIND_FREE_MAPPING(res_idx, mask, 32);
265 } else {
266 panic("%s: pcxl_alloc_range() Too many pages to map.\n",
267 __FILE__);
268 }
269
270 dump_resmap();
271 panic("%s: pcxl_alloc_range() out of dma mapping resources\n",
272 __FILE__);
273
274resource_found:
275
276 DBG_RES("pcxl_alloc_range() res_idx %d mask 0x%08lx res_hint: %d\n",
277 res_idx, mask, pcxl_res_hint);
278
279 pcxl_used_pages += pages_needed;
280 pcxl_used_bytes += ((pages_needed >> 3) ? (pages_needed >> 3) : 1);
281
282 spin_unlock_irqrestore(&pcxl_res_lock, flags);
283
284 dump_resmap();
285
286 /*
287 ** return the corresponding vaddr in the pcxl dma map
288 */
289 return (pcxl_dma_start + (res_idx << (PAGE_SHIFT + 3)));
290}
291
292#define PCXL_FREE_MAPPINGS(idx, m, size) \
293 u##size *res_ptr = (u##size *)&(pcxl_res_map[(idx) + (((size >> 3) - 1) & (~((size >> 3) - 1)))]); \
294 /* BUG_ON((*res_ptr & m) != m); */ \
295 *res_ptr &= ~m;
296
297/*
298** clear bits in the pcxl resource map
299*/
300static void
301pcxl_free_range(unsigned long vaddr, size_t size)
302{
303 u_long mask, flags;
304 unsigned int res_idx = (vaddr - pcxl_dma_start) >> (PAGE_SHIFT + 3);
305 unsigned int pages_mapped = size >> PAGE_SHIFT;
306
307 mask = (u_long) -1L;
308 mask >>= BITS_PER_LONG - pages_mapped;
309
310 DBG_RES("pcxl_free_range() res_idx: %d size: %d pages_mapped %d mask 0x%08lx\n",
311 res_idx, size, pages_mapped, mask);
312
313 spin_lock_irqsave(&pcxl_res_lock, flags);
314
315 if(pages_mapped <= 8) {
316 PCXL_FREE_MAPPINGS(res_idx, mask, 8);
317 } else if(pages_mapped <= 16) {
318 PCXL_FREE_MAPPINGS(res_idx, mask, 16);
319 } else if(pages_mapped <= 32) {
320 PCXL_FREE_MAPPINGS(res_idx, mask, 32);
321 } else {
322 panic("%s: pcxl_free_range() Too many pages to unmap.\n",
323 __FILE__);
324 }
325
326 pcxl_used_pages -= (pages_mapped ? pages_mapped : 1);
327 pcxl_used_bytes -= ((pages_mapped >> 3) ? (pages_mapped >> 3) : 1);
328
329 spin_unlock_irqrestore(&pcxl_res_lock, flags);
330
331 dump_resmap();
332}
333
334static int proc_pcxl_dma_show(struct seq_file *m, void *v)
335{
336#if 0
337 u_long i = 0;
338 unsigned long *res_ptr = (u_long *)pcxl_res_map;
339#endif
340 unsigned long total_pages = pcxl_res_size << 3; /* 8 bits per byte */
341
342 seq_printf(m, "\nDMA Mapping Area size : %d bytes (%ld pages)\n",
343 PCXL_DMA_MAP_SIZE, total_pages);
344
345 seq_printf(m, "Resource bitmap : %d bytes\n", pcxl_res_size);
346
347 seq_puts(m, " total: free: used: % used:\n");
348 seq_printf(m, "blocks %8d %8ld %8ld %8ld%%\n", pcxl_res_size,
349 pcxl_res_size - pcxl_used_bytes, pcxl_used_bytes,
350 (pcxl_used_bytes * 100) / pcxl_res_size);
351
352 seq_printf(m, "pages %8ld %8ld %8ld %8ld%%\n", total_pages,
353 total_pages - pcxl_used_pages, pcxl_used_pages,
354 (pcxl_used_pages * 100 / total_pages));
355
356#if 0
357 seq_puts(m, "\nResource bitmap:");
358
359 for(; i < (pcxl_res_size / sizeof(u_long)); ++i, ++res_ptr) {
360 if ((i & 7) == 0)
361 seq_puts(m,"\n ");
362 seq_printf(m, "%s %08lx", buf, *res_ptr);
363 }
364#endif
365 seq_putc(m, '\n');
366 return 0;
367}
368
369static int __init
370pcxl_dma_init(void)
371{
372 if (pcxl_dma_start == 0)
373 return 0;
374
375 pcxl_res_size = PCXL_DMA_MAP_SIZE >> (PAGE_SHIFT + 3);
376 pcxl_res_hint = 0;
377 pcxl_res_map = (char *)__get_free_pages(GFP_KERNEL,
378 get_order(pcxl_res_size));
379 memset(pcxl_res_map, 0, pcxl_res_size);
380 proc_gsc_root = proc_mkdir("gsc", NULL);
381 if (!proc_gsc_root)
382 printk(KERN_WARNING
383 "pcxl_dma_init: Unable to create gsc /proc dir entry\n");
384 else {
385 struct proc_dir_entry* ent;
386 ent = proc_create_single("pcxl_dma", 0, proc_gsc_root,
387 proc_pcxl_dma_show);
388 if (!ent)
389 printk(KERN_WARNING
390 "pci-dma.c: Unable to create pcxl_dma /proc entry.\n");
391 }
392 return 0;
393}
394
395__initcall(pcxl_dma_init);
396
397void *arch_dma_alloc(struct device *dev, size_t size,
398 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
399{
400 unsigned long vaddr;
401 unsigned long paddr;
402 int order;
403
404 if (boot_cpu_data.cpu_type != pcxl2 && boot_cpu_data.cpu_type != pcxl)
405 return NULL;
406
407 order = get_order(size);
408 size = 1 << (order + PAGE_SHIFT);
409 vaddr = pcxl_alloc_range(size);
410 paddr = __get_free_pages(gfp | __GFP_ZERO, order);
411 flush_kernel_dcache_range(paddr, size);
412 paddr = __pa(paddr);
413 map_uncached_pages(vaddr, size, paddr);
414 *dma_handle = (dma_addr_t) paddr;
415
416#if 0
417/* This probably isn't needed to support EISA cards.
418** ISA cards will certainly only support 24-bit DMA addressing.
419** Not clear if we can, want, or need to support ISA.
420*/
421 if (!dev || *dev->coherent_dma_mask < 0xffffffff)
422 gfp |= GFP_DMA;
423#endif
424 return (void *)vaddr;
425}
426
427void arch_dma_free(struct device *dev, size_t size, void *vaddr,
428 dma_addr_t dma_handle, unsigned long attrs)
429{
430 int order = get_order(size);
431
432 WARN_ON_ONCE(boot_cpu_data.cpu_type != pcxl2 &&
433 boot_cpu_data.cpu_type != pcxl);
434
435 size = 1 << (order + PAGE_SHIFT);
436 unmap_uncached_pages((unsigned long)vaddr, size);
437 pcxl_free_range((unsigned long)vaddr, size);
438
439 free_pages((unsigned long)__va(dma_handle), order);
440}
441
442void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
443 size_t size, enum dma_data_direction dir)
444{
445 flush_kernel_dcache_range((unsigned long)phys_to_virt(paddr), size);
446}
447
448void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
449 size_t size, enum dma_data_direction dir)
450{
451 flush_kernel_dcache_range((unsigned long)phys_to_virt(paddr), size);
452}
453
454void arch_dma_cache_sync(struct device *dev, void *vaddr, size_t size,
455 enum dma_data_direction direction)
456{
457 flush_kernel_dcache_range((unsigned long)vaddr, size);
458}
1/*
2** PARISC 1.1 Dynamic DMA mapping support.
3** This implementation is for PA-RISC platforms that do not support
4** I/O TLBs (aka DMA address translation hardware).
5** See Documentation/PCI/PCI-DMA-mapping.txt for interface definitions.
6**
7** (c) Copyright 1999,2000 Hewlett-Packard Company
8** (c) Copyright 2000 Grant Grundler
9** (c) Copyright 2000 Philipp Rumpf <prumpf@tux.org>
10** (c) Copyright 2000 John Marvin
11**
12** "leveraged" from 2.3.47: arch/ia64/kernel/pci-dma.c.
13** (I assume it's from David Mosberger-Tang but there was no Copyright)
14**
15** AFAIK, all PA7100LC and PA7300LC platforms can use this code.
16**
17** - ggg
18*/
19
20#include <linux/init.h>
21#include <linux/gfp.h>
22#include <linux/mm.h>
23#include <linux/pci.h>
24#include <linux/proc_fs.h>
25#include <linux/seq_file.h>
26#include <linux/string.h>
27#include <linux/types.h>
28#include <linux/scatterlist.h>
29
30#include <asm/cacheflush.h>
31#include <asm/dma.h> /* for DMA_CHUNK_SIZE */
32#include <asm/io.h>
33#include <asm/page.h> /* get_order */
34#include <asm/pgalloc.h>
35#include <asm/uaccess.h>
36#include <asm/tlbflush.h> /* for purge_tlb_*() macros */
37
38static struct proc_dir_entry * proc_gsc_root __read_mostly = NULL;
39static unsigned long pcxl_used_bytes __read_mostly = 0;
40static unsigned long pcxl_used_pages __read_mostly = 0;
41
42extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */
43static spinlock_t pcxl_res_lock;
44static char *pcxl_res_map;
45static int pcxl_res_hint;
46static int pcxl_res_size;
47
48#ifdef DEBUG_PCXL_RESOURCE
49#define DBG_RES(x...) printk(x)
50#else
51#define DBG_RES(x...)
52#endif
53
54
55/*
56** Dump a hex representation of the resource map.
57*/
58
59#ifdef DUMP_RESMAP
60static
61void dump_resmap(void)
62{
63 u_long *res_ptr = (unsigned long *)pcxl_res_map;
64 u_long i = 0;
65
66 printk("res_map: ");
67 for(; i < (pcxl_res_size / sizeof(unsigned long)); ++i, ++res_ptr)
68 printk("%08lx ", *res_ptr);
69
70 printk("\n");
71}
72#else
73static inline void dump_resmap(void) {;}
74#endif
75
76static int pa11_dma_supported( struct device *dev, u64 mask)
77{
78 return 1;
79}
80
81static inline int map_pte_uncached(pte_t * pte,
82 unsigned long vaddr,
83 unsigned long size, unsigned long *paddr_ptr)
84{
85 unsigned long end;
86 unsigned long orig_vaddr = vaddr;
87
88 vaddr &= ~PMD_MASK;
89 end = vaddr + size;
90 if (end > PMD_SIZE)
91 end = PMD_SIZE;
92 do {
93 unsigned long flags;
94
95 if (!pte_none(*pte))
96 printk(KERN_ERR "map_pte_uncached: page already exists\n");
97 set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC));
98 purge_tlb_start(flags);
99 pdtlb_kernel(orig_vaddr);
100 purge_tlb_end(flags);
101 vaddr += PAGE_SIZE;
102 orig_vaddr += PAGE_SIZE;
103 (*paddr_ptr) += PAGE_SIZE;
104 pte++;
105 } while (vaddr < end);
106 return 0;
107}
108
109static inline int map_pmd_uncached(pmd_t * pmd, unsigned long vaddr,
110 unsigned long size, unsigned long *paddr_ptr)
111{
112 unsigned long end;
113 unsigned long orig_vaddr = vaddr;
114
115 vaddr &= ~PGDIR_MASK;
116 end = vaddr + size;
117 if (end > PGDIR_SIZE)
118 end = PGDIR_SIZE;
119 do {
120 pte_t * pte = pte_alloc_kernel(pmd, vaddr);
121 if (!pte)
122 return -ENOMEM;
123 if (map_pte_uncached(pte, orig_vaddr, end - vaddr, paddr_ptr))
124 return -ENOMEM;
125 vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
126 orig_vaddr += PMD_SIZE;
127 pmd++;
128 } while (vaddr < end);
129 return 0;
130}
131
132static inline int map_uncached_pages(unsigned long vaddr, unsigned long size,
133 unsigned long paddr)
134{
135 pgd_t * dir;
136 unsigned long end = vaddr + size;
137
138 dir = pgd_offset_k(vaddr);
139 do {
140 pmd_t *pmd;
141
142 pmd = pmd_alloc(NULL, dir, vaddr);
143 if (!pmd)
144 return -ENOMEM;
145 if (map_pmd_uncached(pmd, vaddr, end - vaddr, &paddr))
146 return -ENOMEM;
147 vaddr = vaddr + PGDIR_SIZE;
148 dir++;
149 } while (vaddr && (vaddr < end));
150 return 0;
151}
152
153static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr,
154 unsigned long size)
155{
156 pte_t * pte;
157 unsigned long end;
158 unsigned long orig_vaddr = vaddr;
159
160 if (pmd_none(*pmd))
161 return;
162 if (pmd_bad(*pmd)) {
163 pmd_ERROR(*pmd);
164 pmd_clear(pmd);
165 return;
166 }
167 pte = pte_offset_map(pmd, vaddr);
168 vaddr &= ~PMD_MASK;
169 end = vaddr + size;
170 if (end > PMD_SIZE)
171 end = PMD_SIZE;
172 do {
173 unsigned long flags;
174 pte_t page = *pte;
175
176 pte_clear(&init_mm, vaddr, pte);
177 purge_tlb_start(flags);
178 pdtlb_kernel(orig_vaddr);
179 purge_tlb_end(flags);
180 vaddr += PAGE_SIZE;
181 orig_vaddr += PAGE_SIZE;
182 pte++;
183 if (pte_none(page) || pte_present(page))
184 continue;
185 printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n");
186 } while (vaddr < end);
187}
188
189static inline void unmap_uncached_pmd(pgd_t * dir, unsigned long vaddr,
190 unsigned long size)
191{
192 pmd_t * pmd;
193 unsigned long end;
194 unsigned long orig_vaddr = vaddr;
195
196 if (pgd_none(*dir))
197 return;
198 if (pgd_bad(*dir)) {
199 pgd_ERROR(*dir);
200 pgd_clear(dir);
201 return;
202 }
203 pmd = pmd_offset(dir, vaddr);
204 vaddr &= ~PGDIR_MASK;
205 end = vaddr + size;
206 if (end > PGDIR_SIZE)
207 end = PGDIR_SIZE;
208 do {
209 unmap_uncached_pte(pmd, orig_vaddr, end - vaddr);
210 vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
211 orig_vaddr += PMD_SIZE;
212 pmd++;
213 } while (vaddr < end);
214}
215
216static void unmap_uncached_pages(unsigned long vaddr, unsigned long size)
217{
218 pgd_t * dir;
219 unsigned long end = vaddr + size;
220
221 dir = pgd_offset_k(vaddr);
222 do {
223 unmap_uncached_pmd(dir, vaddr, end - vaddr);
224 vaddr = vaddr + PGDIR_SIZE;
225 dir++;
226 } while (vaddr && (vaddr < end));
227}
228
229#define PCXL_SEARCH_LOOP(idx, mask, size) \
230 for(; res_ptr < res_end; ++res_ptr) \
231 { \
232 if(0 == ((*res_ptr) & mask)) { \
233 *res_ptr |= mask; \
234 idx = (int)((u_long)res_ptr - (u_long)pcxl_res_map); \
235 pcxl_res_hint = idx + (size >> 3); \
236 goto resource_found; \
237 } \
238 }
239
240#define PCXL_FIND_FREE_MAPPING(idx, mask, size) { \
241 u##size *res_ptr = (u##size *)&(pcxl_res_map[pcxl_res_hint & ~((size >> 3) - 1)]); \
242 u##size *res_end = (u##size *)&pcxl_res_map[pcxl_res_size]; \
243 PCXL_SEARCH_LOOP(idx, mask, size); \
244 res_ptr = (u##size *)&pcxl_res_map[0]; \
245 PCXL_SEARCH_LOOP(idx, mask, size); \
246}
247
248unsigned long
249pcxl_alloc_range(size_t size)
250{
251 int res_idx;
252 u_long mask, flags;
253 unsigned int pages_needed = size >> PAGE_SHIFT;
254
255 mask = (u_long) -1L;
256 mask >>= BITS_PER_LONG - pages_needed;
257
258 DBG_RES("pcxl_alloc_range() size: %d pages_needed %d pages_mask 0x%08lx\n",
259 size, pages_needed, mask);
260
261 spin_lock_irqsave(&pcxl_res_lock, flags);
262
263 if(pages_needed <= 8) {
264 PCXL_FIND_FREE_MAPPING(res_idx, mask, 8);
265 } else if(pages_needed <= 16) {
266 PCXL_FIND_FREE_MAPPING(res_idx, mask, 16);
267 } else if(pages_needed <= 32) {
268 PCXL_FIND_FREE_MAPPING(res_idx, mask, 32);
269 } else {
270 panic("%s: pcxl_alloc_range() Too many pages to map.\n",
271 __FILE__);
272 }
273
274 dump_resmap();
275 panic("%s: pcxl_alloc_range() out of dma mapping resources\n",
276 __FILE__);
277
278resource_found:
279
280 DBG_RES("pcxl_alloc_range() res_idx %d mask 0x%08lx res_hint: %d\n",
281 res_idx, mask, pcxl_res_hint);
282
283 pcxl_used_pages += pages_needed;
284 pcxl_used_bytes += ((pages_needed >> 3) ? (pages_needed >> 3) : 1);
285
286 spin_unlock_irqrestore(&pcxl_res_lock, flags);
287
288 dump_resmap();
289
290 /*
291 ** return the corresponding vaddr in the pcxl dma map
292 */
293 return (pcxl_dma_start + (res_idx << (PAGE_SHIFT + 3)));
294}
295
296#define PCXL_FREE_MAPPINGS(idx, m, size) \
297 u##size *res_ptr = (u##size *)&(pcxl_res_map[(idx) + (((size >> 3) - 1) & (~((size >> 3) - 1)))]); \
298 /* BUG_ON((*res_ptr & m) != m); */ \
299 *res_ptr &= ~m;
300
301/*
302** clear bits in the pcxl resource map
303*/
304static void
305pcxl_free_range(unsigned long vaddr, size_t size)
306{
307 u_long mask, flags;
308 unsigned int res_idx = (vaddr - pcxl_dma_start) >> (PAGE_SHIFT + 3);
309 unsigned int pages_mapped = size >> PAGE_SHIFT;
310
311 mask = (u_long) -1L;
312 mask >>= BITS_PER_LONG - pages_mapped;
313
314 DBG_RES("pcxl_free_range() res_idx: %d size: %d pages_mapped %d mask 0x%08lx\n",
315 res_idx, size, pages_mapped, mask);
316
317 spin_lock_irqsave(&pcxl_res_lock, flags);
318
319 if(pages_mapped <= 8) {
320 PCXL_FREE_MAPPINGS(res_idx, mask, 8);
321 } else if(pages_mapped <= 16) {
322 PCXL_FREE_MAPPINGS(res_idx, mask, 16);
323 } else if(pages_mapped <= 32) {
324 PCXL_FREE_MAPPINGS(res_idx, mask, 32);
325 } else {
326 panic("%s: pcxl_free_range() Too many pages to unmap.\n",
327 __FILE__);
328 }
329
330 pcxl_used_pages -= (pages_mapped ? pages_mapped : 1);
331 pcxl_used_bytes -= ((pages_mapped >> 3) ? (pages_mapped >> 3) : 1);
332
333 spin_unlock_irqrestore(&pcxl_res_lock, flags);
334
335 dump_resmap();
336}
337
338static int proc_pcxl_dma_show(struct seq_file *m, void *v)
339{
340#if 0
341 u_long i = 0;
342 unsigned long *res_ptr = (u_long *)pcxl_res_map;
343#endif
344 unsigned long total_pages = pcxl_res_size << 3; /* 8 bits per byte */
345
346 seq_printf(m, "\nDMA Mapping Area size : %d bytes (%ld pages)\n",
347 PCXL_DMA_MAP_SIZE, total_pages);
348
349 seq_printf(m, "Resource bitmap : %d bytes\n", pcxl_res_size);
350
351 seq_puts(m, " total: free: used: % used:\n");
352 seq_printf(m, "blocks %8d %8ld %8ld %8ld%%\n", pcxl_res_size,
353 pcxl_res_size - pcxl_used_bytes, pcxl_used_bytes,
354 (pcxl_used_bytes * 100) / pcxl_res_size);
355
356 seq_printf(m, "pages %8ld %8ld %8ld %8ld%%\n", total_pages,
357 total_pages - pcxl_used_pages, pcxl_used_pages,
358 (pcxl_used_pages * 100 / total_pages));
359
360#if 0
361 seq_puts(m, "\nResource bitmap:");
362
363 for(; i < (pcxl_res_size / sizeof(u_long)); ++i, ++res_ptr) {
364 if ((i & 7) == 0)
365 seq_puts(m,"\n ");
366 seq_printf(m, "%s %08lx", buf, *res_ptr);
367 }
368#endif
369 seq_putc(m, '\n');
370 return 0;
371}
372
373static int proc_pcxl_dma_open(struct inode *inode, struct file *file)
374{
375 return single_open(file, proc_pcxl_dma_show, NULL);
376}
377
378static const struct file_operations proc_pcxl_dma_ops = {
379 .owner = THIS_MODULE,
380 .open = proc_pcxl_dma_open,
381 .read = seq_read,
382 .llseek = seq_lseek,
383 .release = single_release,
384};
385
386static int __init
387pcxl_dma_init(void)
388{
389 if (pcxl_dma_start == 0)
390 return 0;
391
392 spin_lock_init(&pcxl_res_lock);
393 pcxl_res_size = PCXL_DMA_MAP_SIZE >> (PAGE_SHIFT + 3);
394 pcxl_res_hint = 0;
395 pcxl_res_map = (char *)__get_free_pages(GFP_KERNEL,
396 get_order(pcxl_res_size));
397 memset(pcxl_res_map, 0, pcxl_res_size);
398 proc_gsc_root = proc_mkdir("gsc", NULL);
399 if (!proc_gsc_root)
400 printk(KERN_WARNING
401 "pcxl_dma_init: Unable to create gsc /proc dir entry\n");
402 else {
403 struct proc_dir_entry* ent;
404 ent = proc_create("pcxl_dma", 0, proc_gsc_root,
405 &proc_pcxl_dma_ops);
406 if (!ent)
407 printk(KERN_WARNING
408 "pci-dma.c: Unable to create pcxl_dma /proc entry.\n");
409 }
410 return 0;
411}
412
413__initcall(pcxl_dma_init);
414
415static void * pa11_dma_alloc_consistent (struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag)
416{
417 unsigned long vaddr;
418 unsigned long paddr;
419 int order;
420
421 order = get_order(size);
422 size = 1 << (order + PAGE_SHIFT);
423 vaddr = pcxl_alloc_range(size);
424 paddr = __get_free_pages(flag, order);
425 flush_kernel_dcache_range(paddr, size);
426 paddr = __pa(paddr);
427 map_uncached_pages(vaddr, size, paddr);
428 *dma_handle = (dma_addr_t) paddr;
429
430#if 0
431/* This probably isn't needed to support EISA cards.
432** ISA cards will certainly only support 24-bit DMA addressing.
433** Not clear if we can, want, or need to support ISA.
434*/
435 if (!dev || *dev->coherent_dma_mask < 0xffffffff)
436 gfp |= GFP_DMA;
437#endif
438 return (void *)vaddr;
439}
440
441static void pa11_dma_free_consistent (struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle)
442{
443 int order;
444
445 order = get_order(size);
446 size = 1 << (order + PAGE_SHIFT);
447 unmap_uncached_pages((unsigned long)vaddr, size);
448 pcxl_free_range((unsigned long)vaddr, size);
449 free_pages((unsigned long)__va(dma_handle), order);
450}
451
452static dma_addr_t pa11_dma_map_single(struct device *dev, void *addr, size_t size, enum dma_data_direction direction)
453{
454 BUG_ON(direction == DMA_NONE);
455
456 flush_kernel_dcache_range((unsigned long) addr, size);
457 return virt_to_phys(addr);
458}
459
460static void pa11_dma_unmap_single(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction direction)
461{
462 BUG_ON(direction == DMA_NONE);
463
464 if (direction == DMA_TO_DEVICE)
465 return;
466
467 /*
468 * For PCI_DMA_FROMDEVICE this flush is not necessary for the
469 * simple map/unmap case. However, it IS necessary if if
470 * pci_dma_sync_single_* has been called and the buffer reused.
471 */
472
473 flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle), size);
474 return;
475}
476
477static int pa11_dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
478{
479 int i;
480
481 BUG_ON(direction == DMA_NONE);
482
483 for (i = 0; i < nents; i++, sglist++ ) {
484 unsigned long vaddr = sg_virt_addr(sglist);
485 sg_dma_address(sglist) = (dma_addr_t) virt_to_phys(vaddr);
486 sg_dma_len(sglist) = sglist->length;
487 flush_kernel_dcache_range(vaddr, sglist->length);
488 }
489 return nents;
490}
491
492static void pa11_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
493{
494 int i;
495
496 BUG_ON(direction == DMA_NONE);
497
498 if (direction == DMA_TO_DEVICE)
499 return;
500
501 /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
502
503 for (i = 0; i < nents; i++, sglist++ )
504 flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length);
505 return;
506}
507
508static void pa11_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, enum dma_data_direction direction)
509{
510 BUG_ON(direction == DMA_NONE);
511
512 flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size);
513}
514
515static void pa11_dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, enum dma_data_direction direction)
516{
517 BUG_ON(direction == DMA_NONE);
518
519 flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size);
520}
521
522static void pa11_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
523{
524 int i;
525
526 /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
527
528 for (i = 0; i < nents; i++, sglist++ )
529 flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length);
530}
531
532static void pa11_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
533{
534 int i;
535
536 /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
537
538 for (i = 0; i < nents; i++, sglist++ )
539 flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length);
540}
541
542struct hppa_dma_ops pcxl_dma_ops = {
543 .dma_supported = pa11_dma_supported,
544 .alloc_consistent = pa11_dma_alloc_consistent,
545 .alloc_noncoherent = pa11_dma_alloc_consistent,
546 .free_consistent = pa11_dma_free_consistent,
547 .map_single = pa11_dma_map_single,
548 .unmap_single = pa11_dma_unmap_single,
549 .map_sg = pa11_dma_map_sg,
550 .unmap_sg = pa11_dma_unmap_sg,
551 .dma_sync_single_for_cpu = pa11_dma_sync_single_for_cpu,
552 .dma_sync_single_for_device = pa11_dma_sync_single_for_device,
553 .dma_sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu,
554 .dma_sync_sg_for_device = pa11_dma_sync_sg_for_device,
555};
556
557static void *fail_alloc_consistent(struct device *dev, size_t size,
558 dma_addr_t *dma_handle, gfp_t flag)
559{
560 return NULL;
561}
562
563static void *pa11_dma_alloc_noncoherent(struct device *dev, size_t size,
564 dma_addr_t *dma_handle, gfp_t flag)
565{
566 void *addr;
567
568 addr = (void *)__get_free_pages(flag, get_order(size));
569 if (addr)
570 *dma_handle = (dma_addr_t)virt_to_phys(addr);
571
572 return addr;
573}
574
575static void pa11_dma_free_noncoherent(struct device *dev, size_t size,
576 void *vaddr, dma_addr_t iova)
577{
578 free_pages((unsigned long)vaddr, get_order(size));
579 return;
580}
581
582struct hppa_dma_ops pcx_dma_ops = {
583 .dma_supported = pa11_dma_supported,
584 .alloc_consistent = fail_alloc_consistent,
585 .alloc_noncoherent = pa11_dma_alloc_noncoherent,
586 .free_consistent = pa11_dma_free_noncoherent,
587 .map_single = pa11_dma_map_single,
588 .unmap_single = pa11_dma_unmap_single,
589 .map_sg = pa11_dma_map_sg,
590 .unmap_sg = pa11_dma_unmap_sg,
591 .dma_sync_single_for_cpu = pa11_dma_sync_single_for_cpu,
592 .dma_sync_single_for_device = pa11_dma_sync_single_for_device,
593 .dma_sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu,
594 .dma_sync_sg_for_device = pa11_dma_sync_sg_for_device,
595};