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1 /*
2  * ioport.c:  Simple io mapping allocator.
3  *
4  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
5  * Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
6  *
7  * 1996: sparc_free_io, 1999: ioremap()/iounmap() by Pete Zaitcev.
8  *
9  * 2000/01/29
10  * <rth> zait: as long as pci_alloc_consistent produces something addressable,
11  *	things are ok.
12  * <zaitcev> rth: no, it is relevant, because get_free_pages returns you a
13  *	pointer into the big page mapping
14  * <rth> zait: so what?
15  * <rth> zait: remap_it_my_way(virt_to_phys(get_free_page()))
16  * <zaitcev> Hmm
17  * <zaitcev> Suppose I did this remap_it_my_way(virt_to_phys(get_free_page())).
18  *	So far so good.
19  * <zaitcev> Now, driver calls pci_free_consistent(with result of
20  *	remap_it_my_way()).
21  * <zaitcev> How do you find the address to pass to free_pages()?
22  * <rth> zait: walk the page tables?  It's only two or three level after all.
23  * <rth> zait: you have to walk them anyway to remove the mapping.
24  * <zaitcev> Hmm
25  * <zaitcev> Sounds reasonable
26  */
27 
28 #include <linux/module.h>
29 #include <linux/sched.h>
30 #include <linux/kernel.h>
31 #include <linux/errno.h>
32 #include <linux/types.h>
33 #include <linux/ioport.h>
34 #include <linux/mm.h>
35 #include <linux/slab.h>
36 #include <linux/pci.h>		/* struct pci_dev */
37 #include <linux/proc_fs.h>
38 #include <linux/scatterlist.h>
39 #include <linux/of_device.h>
40 
41 #include <asm/io.h>
42 #include <asm/vaddrs.h>
43 #include <asm/oplib.h>
44 #include <asm/prom.h>
45 #include <asm/page.h>
46 #include <asm/pgalloc.h>
47 #include <asm/dma.h>
48 #include <asm/iommu.h>
49 #include <asm/io-unit.h>
50 
51 #include "dma.h"
52 
53 #define mmu_inval_dma_area(p, l)	/* Anton pulled it out for 2.4.0-xx */
54 
55 static struct resource *_sparc_find_resource(struct resource *r,
56 					     unsigned long);
57 
58 static void __iomem *_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz);
59 static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
60     unsigned long size, char *name);
61 static void _sparc_free_io(struct resource *res);
62 
63 static void register_proc_sparc_ioport(void);
64 
65 /* This points to the next to use virtual memory for DVMA mappings */
66 static struct resource _sparc_dvma = {
67 	.name = "sparc_dvma", .start = DVMA_VADDR, .end = DVMA_END - 1
68 };
69 /* This points to the start of I/O mappings, cluable from outside. */
70 /*ext*/ struct resource sparc_iomap = {
71 	.name = "sparc_iomap", .start = IOBASE_VADDR, .end = IOBASE_END - 1
72 };
73 
74 /*
75  * Our mini-allocator...
76  * Boy this is gross! We need it because we must map I/O for
77  * timers and interrupt controller before the kmalloc is available.
78  */
79 
80 #define XNMLN  15
81 #define XNRES  10	/* SS-10 uses 8 */
82 
83 struct xresource {
84 	struct resource xres;	/* Must be first */
85 	int xflag;		/* 1 == used */
86 	char xname[XNMLN+1];
87 };
88 
89 static struct xresource xresv[XNRES];
90 
xres_alloc(void)91 static struct xresource *xres_alloc(void) {
92 	struct xresource *xrp;
93 	int n;
94 
95 	xrp = xresv;
96 	for (n = 0; n < XNRES; n++) {
97 		if (xrp->xflag == 0) {
98 			xrp->xflag = 1;
99 			return xrp;
100 		}
101 		xrp++;
102 	}
103 	return NULL;
104 }
105 
xres_free(struct xresource * xrp)106 static void xres_free(struct xresource *xrp) {
107 	xrp->xflag = 0;
108 }
109 
110 /*
111  * These are typically used in PCI drivers
112  * which are trying to be cross-platform.
113  *
114  * Bus type is always zero on IIep.
115  */
ioremap(unsigned long offset,unsigned long size)116 void __iomem *ioremap(unsigned long offset, unsigned long size)
117 {
118 	char name[14];
119 
120 	sprintf(name, "phys_%08x", (u32)offset);
121 	return _sparc_alloc_io(0, offset, size, name);
122 }
123 EXPORT_SYMBOL(ioremap);
124 
125 /*
126  * Comlimentary to ioremap().
127  */
iounmap(volatile void __iomem * virtual)128 void iounmap(volatile void __iomem *virtual)
129 {
130 	unsigned long vaddr = (unsigned long) virtual & PAGE_MASK;
131 	struct resource *res;
132 
133 	if ((res = _sparc_find_resource(&sparc_iomap, vaddr)) == NULL) {
134 		printk("free_io/iounmap: cannot free %lx\n", vaddr);
135 		return;
136 	}
137 	_sparc_free_io(res);
138 
139 	if ((char *)res >= (char*)xresv && (char *)res < (char *)&xresv[XNRES]) {
140 		xres_free((struct xresource *)res);
141 	} else {
142 		kfree(res);
143 	}
144 }
145 EXPORT_SYMBOL(iounmap);
146 
of_ioremap(struct resource * res,unsigned long offset,unsigned long size,char * name)147 void __iomem *of_ioremap(struct resource *res, unsigned long offset,
148 			 unsigned long size, char *name)
149 {
150 	return _sparc_alloc_io(res->flags & 0xF,
151 			       res->start + offset,
152 			       size, name);
153 }
154 EXPORT_SYMBOL(of_ioremap);
155 
of_iounmap(struct resource * res,void __iomem * base,unsigned long size)156 void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
157 {
158 	iounmap(base);
159 }
160 EXPORT_SYMBOL(of_iounmap);
161 
162 /*
163  * Meat of mapping
164  */
_sparc_alloc_io(unsigned int busno,unsigned long phys,unsigned long size,char * name)165 static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
166     unsigned long size, char *name)
167 {
168 	static int printed_full;
169 	struct xresource *xres;
170 	struct resource *res;
171 	char *tack;
172 	int tlen;
173 	void __iomem *va;	/* P3 diag */
174 
175 	if (name == NULL) name = "???";
176 
177 	if ((xres = xres_alloc()) != 0) {
178 		tack = xres->xname;
179 		res = &xres->xres;
180 	} else {
181 		if (!printed_full) {
182 			printk("ioremap: done with statics, switching to malloc\n");
183 			printed_full = 1;
184 		}
185 		tlen = strlen(name);
186 		tack = kmalloc(sizeof (struct resource) + tlen + 1, GFP_KERNEL);
187 		if (tack == NULL) return NULL;
188 		memset(tack, 0, sizeof(struct resource));
189 		res = (struct resource *) tack;
190 		tack += sizeof (struct resource);
191 	}
192 
193 	strlcpy(tack, name, XNMLN+1);
194 	res->name = tack;
195 
196 	va = _sparc_ioremap(res, busno, phys, size);
197 	/* printk("ioremap(0x%x:%08lx[0x%lx])=%p\n", busno, phys, size, va); */ /* P3 diag */
198 	return va;
199 }
200 
201 /*
202  */
203 static void __iomem *
_sparc_ioremap(struct resource * res,u32 bus,u32 pa,int sz)204 _sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz)
205 {
206 	unsigned long offset = ((unsigned long) pa) & (~PAGE_MASK);
207 
208 	if (allocate_resource(&sparc_iomap, res,
209 	    (offset + sz + PAGE_SIZE-1) & PAGE_MASK,
210 	    sparc_iomap.start, sparc_iomap.end, PAGE_SIZE, NULL, NULL) != 0) {
211 		/* Usually we cannot see printks in this case. */
212 		prom_printf("alloc_io_res(%s): cannot occupy\n",
213 		    (res->name != NULL)? res->name: "???");
214 		prom_halt();
215 	}
216 
217 	pa &= PAGE_MASK;
218 	sparc_mapiorange(bus, pa, res->start, res->end - res->start + 1);
219 
220 	return (void __iomem *)(unsigned long)(res->start + offset);
221 }
222 
223 /*
224  * Comlimentary to _sparc_ioremap().
225  */
_sparc_free_io(struct resource * res)226 static void _sparc_free_io(struct resource *res)
227 {
228 	unsigned long plen;
229 
230 	plen = res->end - res->start + 1;
231 	BUG_ON((plen & (PAGE_SIZE-1)) != 0);
232 	sparc_unmapiorange(res->start, plen);
233 	release_resource(res);
234 }
235 
236 #ifdef CONFIG_SBUS
237 
sbus_set_sbus64(struct device * dev,int x)238 void sbus_set_sbus64(struct device *dev, int x)
239 {
240 	printk("sbus_set_sbus64: unsupported\n");
241 }
242 EXPORT_SYMBOL(sbus_set_sbus64);
243 
244 /*
245  * Allocate a chunk of memory suitable for DMA.
246  * Typically devices use them for control blocks.
247  * CPU may access them without any explicit flushing.
248  */
sbus_alloc_consistent(struct device * dev,long len,u32 * dma_addrp)249 void *sbus_alloc_consistent(struct device *dev, long len, u32 *dma_addrp)
250 {
251 	struct of_device *op = to_of_device(dev);
252 	unsigned long len_total = (len + PAGE_SIZE-1) & PAGE_MASK;
253 	unsigned long va;
254 	struct resource *res;
255 	int order;
256 
257 	/* XXX why are some lengths signed, others unsigned? */
258 	if (len <= 0) {
259 		return NULL;
260 	}
261 	/* XXX So what is maxphys for us and how do drivers know it? */
262 	if (len > 256*1024) {			/* __get_free_pages() limit */
263 		return NULL;
264 	}
265 
266 	order = get_order(len_total);
267 	if ((va = __get_free_pages(GFP_KERNEL|__GFP_COMP, order)) == 0)
268 		goto err_nopages;
269 
270 	if ((res = kzalloc(sizeof(struct resource), GFP_KERNEL)) == NULL)
271 		goto err_nomem;
272 
273 	if (allocate_resource(&_sparc_dvma, res, len_total,
274 	    _sparc_dvma.start, _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) {
275 		printk("sbus_alloc_consistent: cannot occupy 0x%lx", len_total);
276 		goto err_nova;
277 	}
278 	mmu_inval_dma_area(va, len_total);
279 	// XXX The mmu_map_dma_area does this for us below, see comments.
280 	// sparc_mapiorange(0, virt_to_phys(va), res->start, len_total);
281 	/*
282 	 * XXX That's where sdev would be used. Currently we load
283 	 * all iommu tables with the same translations.
284 	 */
285 	if (mmu_map_dma_area(dev, dma_addrp, va, res->start, len_total) != 0)
286 		goto err_noiommu;
287 
288 	res->name = op->node->name;
289 
290 	return (void *)(unsigned long)res->start;
291 
292 err_noiommu:
293 	release_resource(res);
294 err_nova:
295 	free_pages(va, order);
296 err_nomem:
297 	kfree(res);
298 err_nopages:
299 	return NULL;
300 }
301 
sbus_free_consistent(struct device * dev,long n,void * p,u32 ba)302 void sbus_free_consistent(struct device *dev, long n, void *p, u32 ba)
303 {
304 	struct resource *res;
305 	struct page *pgv;
306 
307 	if ((res = _sparc_find_resource(&_sparc_dvma,
308 	    (unsigned long)p)) == NULL) {
309 		printk("sbus_free_consistent: cannot free %p\n", p);
310 		return;
311 	}
312 
313 	if (((unsigned long)p & (PAGE_SIZE-1)) != 0) {
314 		printk("sbus_free_consistent: unaligned va %p\n", p);
315 		return;
316 	}
317 
318 	n = (n + PAGE_SIZE-1) & PAGE_MASK;
319 	if ((res->end-res->start)+1 != n) {
320 		printk("sbus_free_consistent: region 0x%lx asked 0x%lx\n",
321 		    (long)((res->end-res->start)+1), n);
322 		return;
323 	}
324 
325 	release_resource(res);
326 	kfree(res);
327 
328 	/* mmu_inval_dma_area(va, n); */ /* it's consistent, isn't it */
329 	pgv = virt_to_page(p);
330 	mmu_unmap_dma_area(dev, ba, n);
331 
332 	__free_pages(pgv, get_order(n));
333 }
334 
335 /*
336  * Map a chunk of memory so that devices can see it.
337  * CPU view of this memory may be inconsistent with
338  * a device view and explicit flushing is necessary.
339  */
sbus_map_single(struct device * dev,void * va,size_t len,int direction)340 dma_addr_t sbus_map_single(struct device *dev, void *va, size_t len, int direction)
341 {
342 	/* XXX why are some lengths signed, others unsigned? */
343 	if (len <= 0) {
344 		return 0;
345 	}
346 	/* XXX So what is maxphys for us and how do drivers know it? */
347 	if (len > 256*1024) {			/* __get_free_pages() limit */
348 		return 0;
349 	}
350 	return mmu_get_scsi_one(dev, va, len);
351 }
352 
sbus_unmap_single(struct device * dev,dma_addr_t ba,size_t n,int direction)353 void sbus_unmap_single(struct device *dev, dma_addr_t ba, size_t n, int direction)
354 {
355 	mmu_release_scsi_one(dev, ba, n);
356 }
357 
sbus_map_sg(struct device * dev,struct scatterlist * sg,int n,int direction)358 int sbus_map_sg(struct device *dev, struct scatterlist *sg, int n, int direction)
359 {
360 	mmu_get_scsi_sgl(dev, sg, n);
361 
362 	/*
363 	 * XXX sparc64 can return a partial length here. sun4c should do this
364 	 * but it currently panics if it can't fulfill the request - Anton
365 	 */
366 	return n;
367 }
368 
sbus_unmap_sg(struct device * dev,struct scatterlist * sg,int n,int direction)369 void sbus_unmap_sg(struct device *dev, struct scatterlist *sg, int n, int direction)
370 {
371 	mmu_release_scsi_sgl(dev, sg, n);
372 }
373 
sbus_dma_sync_single_for_cpu(struct device * dev,dma_addr_t ba,size_t size,int direction)374 void sbus_dma_sync_single_for_cpu(struct device *dev, dma_addr_t ba, size_t size, int direction)
375 {
376 }
377 
sbus_dma_sync_single_for_device(struct device * dev,dma_addr_t ba,size_t size,int direction)378 void sbus_dma_sync_single_for_device(struct device *dev, dma_addr_t ba, size_t size, int direction)
379 {
380 }
381 
sparc_register_ioport(void)382 static int __init sparc_register_ioport(void)
383 {
384 	register_proc_sparc_ioport();
385 
386 	return 0;
387 }
388 
389 arch_initcall(sparc_register_ioport);
390 
391 #endif /* CONFIG_SBUS */
392 
393 #ifdef CONFIG_PCI
394 
395 /* Allocate and map kernel buffer using consistent mode DMA for a device.
396  * hwdev should be valid struct pci_dev pointer for PCI devices.
397  */
pci_alloc_consistent(struct pci_dev * pdev,size_t len,dma_addr_t * pba)398 void *pci_alloc_consistent(struct pci_dev *pdev, size_t len, dma_addr_t *pba)
399 {
400 	unsigned long len_total = (len + PAGE_SIZE-1) & PAGE_MASK;
401 	unsigned long va;
402 	struct resource *res;
403 	int order;
404 
405 	if (len == 0) {
406 		return NULL;
407 	}
408 	if (len > 256*1024) {			/* __get_free_pages() limit */
409 		return NULL;
410 	}
411 
412 	order = get_order(len_total);
413 	va = __get_free_pages(GFP_KERNEL, order);
414 	if (va == 0) {
415 		printk("pci_alloc_consistent: no %ld pages\n", len_total>>PAGE_SHIFT);
416 		return NULL;
417 	}
418 
419 	if ((res = kzalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) {
420 		free_pages(va, order);
421 		printk("pci_alloc_consistent: no core\n");
422 		return NULL;
423 	}
424 
425 	if (allocate_resource(&_sparc_dvma, res, len_total,
426 	    _sparc_dvma.start, _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) {
427 		printk("pci_alloc_consistent: cannot occupy 0x%lx", len_total);
428 		free_pages(va, order);
429 		kfree(res);
430 		return NULL;
431 	}
432 	mmu_inval_dma_area(va, len_total);
433 #if 0
434 /* P3 */ printk("pci_alloc_consistent: kva %lx uncva %lx phys %lx size %lx\n",
435   (long)va, (long)res->start, (long)virt_to_phys(va), len_total);
436 #endif
437 	sparc_mapiorange(0, virt_to_phys(va), res->start, len_total);
438 
439 	*pba = virt_to_phys(va); /* equals virt_to_bus (R.I.P.) for us. */
440 	return (void *) res->start;
441 }
442 EXPORT_SYMBOL(pci_alloc_consistent);
443 
444 /* Free and unmap a consistent DMA buffer.
445  * cpu_addr is what was returned from pci_alloc_consistent,
446  * size must be the same as what as passed into pci_alloc_consistent,
447  * and likewise dma_addr must be the same as what *dma_addrp was set to.
448  *
449  * References to the memory and mappings associated with cpu_addr/dma_addr
450  * past this call are illegal.
451  */
pci_free_consistent(struct pci_dev * pdev,size_t n,void * p,dma_addr_t ba)452 void pci_free_consistent(struct pci_dev *pdev, size_t n, void *p, dma_addr_t ba)
453 {
454 	struct resource *res;
455 	unsigned long pgp;
456 
457 	if ((res = _sparc_find_resource(&_sparc_dvma,
458 	    (unsigned long)p)) == NULL) {
459 		printk("pci_free_consistent: cannot free %p\n", p);
460 		return;
461 	}
462 
463 	if (((unsigned long)p & (PAGE_SIZE-1)) != 0) {
464 		printk("pci_free_consistent: unaligned va %p\n", p);
465 		return;
466 	}
467 
468 	n = (n + PAGE_SIZE-1) & PAGE_MASK;
469 	if ((res->end-res->start)+1 != n) {
470 		printk("pci_free_consistent: region 0x%lx asked 0x%lx\n",
471 		    (long)((res->end-res->start)+1), (long)n);
472 		return;
473 	}
474 
475 	pgp = (unsigned long) phys_to_virt(ba);	/* bus_to_virt actually */
476 	mmu_inval_dma_area(pgp, n);
477 	sparc_unmapiorange((unsigned long)p, n);
478 
479 	release_resource(res);
480 	kfree(res);
481 
482 	free_pages(pgp, get_order(n));
483 }
484 EXPORT_SYMBOL(pci_free_consistent);
485 
486 /* Map a single buffer of the indicated size for DMA in streaming mode.
487  * The 32-bit bus address to use is returned.
488  *
489  * Once the device is given the dma address, the device owns this memory
490  * until either pci_unmap_single or pci_dma_sync_single_* is performed.
491  */
pci_map_single(struct pci_dev * hwdev,void * ptr,size_t size,int direction)492 dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr, size_t size,
493     int direction)
494 {
495 	BUG_ON(direction == PCI_DMA_NONE);
496 	/* IIep is write-through, not flushing. */
497 	return virt_to_phys(ptr);
498 }
499 EXPORT_SYMBOL(pci_map_single);
500 
501 /* Unmap a single streaming mode DMA translation.  The dma_addr and size
502  * must match what was provided for in a previous pci_map_single call.  All
503  * other usages are undefined.
504  *
505  * After this call, reads by the cpu to the buffer are guaranteed to see
506  * whatever the device wrote there.
507  */
pci_unmap_single(struct pci_dev * hwdev,dma_addr_t ba,size_t size,int direction)508 void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t ba, size_t size,
509     int direction)
510 {
511 	BUG_ON(direction == PCI_DMA_NONE);
512 	if (direction != PCI_DMA_TODEVICE) {
513 		mmu_inval_dma_area((unsigned long)phys_to_virt(ba),
514 		    (size + PAGE_SIZE-1) & PAGE_MASK);
515 	}
516 }
517 EXPORT_SYMBOL(pci_unmap_single);
518 
519 /*
520  * Same as pci_map_single, but with pages.
521  */
pci_map_page(struct pci_dev * hwdev,struct page * page,unsigned long offset,size_t size,int direction)522 dma_addr_t pci_map_page(struct pci_dev *hwdev, struct page *page,
523 			unsigned long offset, size_t size, int direction)
524 {
525 	BUG_ON(direction == PCI_DMA_NONE);
526 	/* IIep is write-through, not flushing. */
527 	return page_to_phys(page) + offset;
528 }
529 EXPORT_SYMBOL(pci_map_page);
530 
pci_unmap_page(struct pci_dev * hwdev,dma_addr_t dma_address,size_t size,int direction)531 void pci_unmap_page(struct pci_dev *hwdev,
532 			dma_addr_t dma_address, size_t size, int direction)
533 {
534 	BUG_ON(direction == PCI_DMA_NONE);
535 	/* mmu_inval_dma_area XXX */
536 }
537 EXPORT_SYMBOL(pci_unmap_page);
538 
539 /* Map a set of buffers described by scatterlist in streaming
540  * mode for DMA.  This is the scather-gather version of the
541  * above pci_map_single interface.  Here the scatter gather list
542  * elements are each tagged with the appropriate dma address
543  * and length.  They are obtained via sg_dma_{address,length}(SG).
544  *
545  * NOTE: An implementation may be able to use a smaller number of
546  *       DMA address/length pairs than there are SG table elements.
547  *       (for example via virtual mapping capabilities)
548  *       The routine returns the number of addr/length pairs actually
549  *       used, at most nents.
550  *
551  * Device ownership issues as mentioned above for pci_map_single are
552  * the same here.
553  */
pci_map_sg(struct pci_dev * hwdev,struct scatterlist * sgl,int nents,int direction)554 int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sgl, int nents,
555     int direction)
556 {
557 	struct scatterlist *sg;
558 	int n;
559 
560 	BUG_ON(direction == PCI_DMA_NONE);
561 	/* IIep is write-through, not flushing. */
562 	for_each_sg(sgl, sg, nents, n) {
563 		BUG_ON(page_address(sg_page(sg)) == NULL);
564 		sg->dma_address = virt_to_phys(sg_virt(sg));
565 		sg->dma_length = sg->length;
566 	}
567 	return nents;
568 }
569 EXPORT_SYMBOL(pci_map_sg);
570 
571 /* Unmap a set of streaming mode DMA translations.
572  * Again, cpu read rules concerning calls here are the same as for
573  * pci_unmap_single() above.
574  */
pci_unmap_sg(struct pci_dev * hwdev,struct scatterlist * sgl,int nents,int direction)575 void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sgl, int nents,
576     int direction)
577 {
578 	struct scatterlist *sg;
579 	int n;
580 
581 	BUG_ON(direction == PCI_DMA_NONE);
582 	if (direction != PCI_DMA_TODEVICE) {
583 		for_each_sg(sgl, sg, nents, n) {
584 			BUG_ON(page_address(sg_page(sg)) == NULL);
585 			mmu_inval_dma_area(
586 			    (unsigned long) page_address(sg_page(sg)),
587 			    (sg->length + PAGE_SIZE-1) & PAGE_MASK);
588 		}
589 	}
590 }
591 EXPORT_SYMBOL(pci_unmap_sg);
592 
593 /* Make physical memory consistent for a single
594  * streaming mode DMA translation before or after a transfer.
595  *
596  * If you perform a pci_map_single() but wish to interrogate the
597  * buffer using the cpu, yet do not wish to teardown the PCI dma
598  * mapping, you must call this function before doing so.  At the
599  * next point you give the PCI dma address back to the card, you
600  * must first perform a pci_dma_sync_for_device, and then the
601  * device again owns the buffer.
602  */
pci_dma_sync_single_for_cpu(struct pci_dev * hwdev,dma_addr_t ba,size_t size,int direction)603 void pci_dma_sync_single_for_cpu(struct pci_dev *hwdev, dma_addr_t ba, size_t size, int direction)
604 {
605 	BUG_ON(direction == PCI_DMA_NONE);
606 	if (direction != PCI_DMA_TODEVICE) {
607 		mmu_inval_dma_area((unsigned long)phys_to_virt(ba),
608 		    (size + PAGE_SIZE-1) & PAGE_MASK);
609 	}
610 }
611 EXPORT_SYMBOL(pci_dma_sync_single_for_cpu);
612 
pci_dma_sync_single_for_device(struct pci_dev * hwdev,dma_addr_t ba,size_t size,int direction)613 void pci_dma_sync_single_for_device(struct pci_dev *hwdev, dma_addr_t ba, size_t size, int direction)
614 {
615 	BUG_ON(direction == PCI_DMA_NONE);
616 	if (direction != PCI_DMA_TODEVICE) {
617 		mmu_inval_dma_area((unsigned long)phys_to_virt(ba),
618 		    (size + PAGE_SIZE-1) & PAGE_MASK);
619 	}
620 }
621 EXPORT_SYMBOL(pci_dma_sync_single_for_device);
622 
623 /* Make physical memory consistent for a set of streaming
624  * mode DMA translations after a transfer.
625  *
626  * The same as pci_dma_sync_single_* but for a scatter-gather list,
627  * same rules and usage.
628  */
pci_dma_sync_sg_for_cpu(struct pci_dev * hwdev,struct scatterlist * sgl,int nents,int direction)629 void pci_dma_sync_sg_for_cpu(struct pci_dev *hwdev, struct scatterlist *sgl, int nents, int direction)
630 {
631 	struct scatterlist *sg;
632 	int n;
633 
634 	BUG_ON(direction == PCI_DMA_NONE);
635 	if (direction != PCI_DMA_TODEVICE) {
636 		for_each_sg(sgl, sg, nents, n) {
637 			BUG_ON(page_address(sg_page(sg)) == NULL);
638 			mmu_inval_dma_area(
639 			    (unsigned long) page_address(sg_page(sg)),
640 			    (sg->length + PAGE_SIZE-1) & PAGE_MASK);
641 		}
642 	}
643 }
644 EXPORT_SYMBOL(pci_dma_sync_sg_for_cpu);
645 
pci_dma_sync_sg_for_device(struct pci_dev * hwdev,struct scatterlist * sgl,int nents,int direction)646 void pci_dma_sync_sg_for_device(struct pci_dev *hwdev, struct scatterlist *sgl, int nents, int direction)
647 {
648 	struct scatterlist *sg;
649 	int n;
650 
651 	BUG_ON(direction == PCI_DMA_NONE);
652 	if (direction != PCI_DMA_TODEVICE) {
653 		for_each_sg(sgl, sg, nents, n) {
654 			BUG_ON(page_address(sg_page(sg)) == NULL);
655 			mmu_inval_dma_area(
656 			    (unsigned long) page_address(sg_page(sg)),
657 			    (sg->length + PAGE_SIZE-1) & PAGE_MASK);
658 		}
659 	}
660 }
661 EXPORT_SYMBOL(pci_dma_sync_sg_for_device);
662 #endif /* CONFIG_PCI */
663 
664 #ifdef CONFIG_PROC_FS
665 
666 static int
_sparc_io_get_info(char * buf,char ** start,off_t fpos,int length,int * eof,void * data)667 _sparc_io_get_info(char *buf, char **start, off_t fpos, int length, int *eof,
668     void *data)
669 {
670 	char *p = buf, *e = buf + length;
671 	struct resource *r;
672 	const char *nm;
673 
674 	for (r = ((struct resource *)data)->child; r != NULL; r = r->sibling) {
675 		if (p + 32 >= e)	/* Better than nothing */
676 			break;
677 		if ((nm = r->name) == 0) nm = "???";
678 		p += sprintf(p, "%016llx-%016llx: %s\n",
679 				(unsigned long long)r->start,
680 				(unsigned long long)r->end, nm);
681 	}
682 
683 	return p-buf;
684 }
685 
686 #endif /* CONFIG_PROC_FS */
687 
688 /*
689  * This is a version of find_resource and it belongs to kernel/resource.c.
690  * Until we have agreement with Linus and Martin, it lingers here.
691  *
692  * XXX Too slow. Can have 8192 DVMA pages on sun4m in the worst case.
693  * This probably warrants some sort of hashing.
694  */
_sparc_find_resource(struct resource * root,unsigned long hit)695 static struct resource *_sparc_find_resource(struct resource *root,
696 					     unsigned long hit)
697 {
698         struct resource *tmp;
699 
700 	for (tmp = root->child; tmp != 0; tmp = tmp->sibling) {
701 		if (tmp->start <= hit && tmp->end >= hit)
702 			return tmp;
703 	}
704 	return NULL;
705 }
706 
register_proc_sparc_ioport(void)707 static void register_proc_sparc_ioport(void)
708 {
709 #ifdef CONFIG_PROC_FS
710 	create_proc_read_entry("io_map",0,NULL,_sparc_io_get_info,&sparc_iomap);
711 	create_proc_read_entry("dvma_map",0,NULL,_sparc_io_get_info,&_sparc_dvma);
712 #endif
713 }
714