2 * ioport.c: Simple io mapping allocator.
4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
7 * 1996: sparc_free_io, 1999: ioremap()/iounmap() by Pete Zaitcev.
10 * <rth> zait: as long as pci_alloc_consistent produces something addressable,
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()))
17 * <zaitcev> Suppose I did this remap_it_my_way(virt_to_phys(get_free_page())).
19 * <zaitcev> Now, driver calls pci_free_consistent(with result of
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.
25 * <zaitcev> Sounds reasonable
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>
35 #include <linux/slab.h>
36 #include <linux/pci.h> /* struct pci_dev */
37 #include <linux/proc_fs.h>
38 #include <linux/seq_file.h>
39 #include <linux/scatterlist.h>
40 #include <linux/of_device.h>
43 #include <asm/vaddrs.h>
44 #include <asm/oplib.h>
47 #include <asm/pgalloc.h>
49 #include <asm/iommu.h>
50 #include <asm/io-unit.h>
54 #define mmu_inval_dma_area(p, l) /* Anton pulled it out for 2.4.0-xx */
56 static struct resource *_sparc_find_resource(struct resource *r,
59 static void __iomem *_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz);
60 static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
61 unsigned long size, char *name);
62 static void _sparc_free_io(struct resource *res);
64 static void register_proc_sparc_ioport(void);
66 /* This points to the next to use virtual memory for DVMA mappings */
67 static struct resource _sparc_dvma = {
68 .name = "sparc_dvma", .start = DVMA_VADDR, .end = DVMA_END - 1
70 /* This points to the start of I/O mappings, cluable from outside. */
71 /*ext*/ struct resource sparc_iomap = {
72 .name = "sparc_iomap", .start = IOBASE_VADDR, .end = IOBASE_END - 1
76 * Our mini-allocator...
77 * Boy this is gross! We need it because we must map I/O for
78 * timers and interrupt controller before the kmalloc is available.
82 #define XNRES 10 /* SS-10 uses 8 */
85 struct resource xres; /* Must be first */
86 int xflag; /* 1 == used */
90 static struct xresource xresv[XNRES];
92 static struct xresource *xres_alloc(void) {
93 struct xresource *xrp;
97 for (n = 0; n < XNRES; n++) {
98 if (xrp->xflag == 0) {
107 static void xres_free(struct xresource *xrp) {
112 * These are typically used in PCI drivers
113 * which are trying to be cross-platform.
115 * Bus type is always zero on IIep.
117 void __iomem *ioremap(unsigned long offset, unsigned long size)
121 sprintf(name, "phys_%08x", (u32)offset);
122 return _sparc_alloc_io(0, offset, size, name);
124 EXPORT_SYMBOL(ioremap);
127 * Comlimentary to ioremap().
129 void iounmap(volatile void __iomem *virtual)
131 unsigned long vaddr = (unsigned long) virtual & PAGE_MASK;
132 struct resource *res;
134 if ((res = _sparc_find_resource(&sparc_iomap, vaddr)) == NULL) {
135 printk("free_io/iounmap: cannot free %lx\n", vaddr);
140 if ((char *)res >= (char*)xresv && (char *)res < (char *)&xresv[XNRES]) {
141 xres_free((struct xresource *)res);
146 EXPORT_SYMBOL(iounmap);
148 void __iomem *of_ioremap(struct resource *res, unsigned long offset,
149 unsigned long size, char *name)
151 return _sparc_alloc_io(res->flags & 0xF,
155 EXPORT_SYMBOL(of_ioremap);
157 void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
161 EXPORT_SYMBOL(of_iounmap);
166 static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
167 unsigned long size, char *name)
169 static int printed_full;
170 struct xresource *xres;
171 struct resource *res;
174 void __iomem *va; /* P3 diag */
176 if (name == NULL) name = "???";
178 if ((xres = xres_alloc()) != 0) {
183 printk("ioremap: done with statics, switching to malloc\n");
187 tack = kmalloc(sizeof (struct resource) + tlen + 1, GFP_KERNEL);
188 if (tack == NULL) return NULL;
189 memset(tack, 0, sizeof(struct resource));
190 res = (struct resource *) tack;
191 tack += sizeof (struct resource);
194 strlcpy(tack, name, XNMLN+1);
197 va = _sparc_ioremap(res, busno, phys, size);
198 /* printk("ioremap(0x%x:%08lx[0x%lx])=%p\n", busno, phys, size, va); */ /* P3 diag */
204 static void __iomem *
205 _sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz)
207 unsigned long offset = ((unsigned long) pa) & (~PAGE_MASK);
209 if (allocate_resource(&sparc_iomap, res,
210 (offset + sz + PAGE_SIZE-1) & PAGE_MASK,
211 sparc_iomap.start, sparc_iomap.end, PAGE_SIZE, NULL, NULL) != 0) {
212 /* Usually we cannot see printks in this case. */
213 prom_printf("alloc_io_res(%s): cannot occupy\n",
214 (res->name != NULL)? res->name: "???");
219 sparc_mapiorange(bus, pa, res->start, res->end - res->start + 1);
221 return (void __iomem *)(unsigned long)(res->start + offset);
225 * Comlimentary to _sparc_ioremap().
227 static void _sparc_free_io(struct resource *res)
231 plen = res->end - res->start + 1;
232 BUG_ON((plen & (PAGE_SIZE-1)) != 0);
233 sparc_unmapiorange(res->start, plen);
234 release_resource(res);
239 void sbus_set_sbus64(struct device *dev, int x)
241 printk("sbus_set_sbus64: unsupported\n");
243 EXPORT_SYMBOL(sbus_set_sbus64);
246 * Allocate a chunk of memory suitable for DMA.
247 * Typically devices use them for control blocks.
248 * CPU may access them without any explicit flushing.
250 void *sbus_alloc_consistent(struct device *dev, long len, u32 *dma_addrp)
252 struct of_device *op = to_of_device(dev);
253 unsigned long len_total = (len + PAGE_SIZE-1) & PAGE_MASK;
255 struct resource *res;
258 /* XXX why are some lengths signed, others unsigned? */
262 /* XXX So what is maxphys for us and how do drivers know it? */
263 if (len > 256*1024) { /* __get_free_pages() limit */
267 order = get_order(len_total);
268 if ((va = __get_free_pages(GFP_KERNEL|__GFP_COMP, order)) == 0)
271 if ((res = kzalloc(sizeof(struct resource), GFP_KERNEL)) == NULL)
274 if (allocate_resource(&_sparc_dvma, res, len_total,
275 _sparc_dvma.start, _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) {
276 printk("sbus_alloc_consistent: cannot occupy 0x%lx", len_total);
279 mmu_inval_dma_area(va, len_total);
280 // XXX The mmu_map_dma_area does this for us below, see comments.
281 // sparc_mapiorange(0, virt_to_phys(va), res->start, len_total);
283 * XXX That's where sdev would be used. Currently we load
284 * all iommu tables with the same translations.
286 if (mmu_map_dma_area(dev, dma_addrp, va, res->start, len_total) != 0)
289 res->name = op->node->name;
291 return (void *)(unsigned long)res->start;
294 release_resource(res);
296 free_pages(va, order);
303 void sbus_free_consistent(struct device *dev, long n, void *p, u32 ba)
305 struct resource *res;
308 if ((res = _sparc_find_resource(&_sparc_dvma,
309 (unsigned long)p)) == NULL) {
310 printk("sbus_free_consistent: cannot free %p\n", p);
314 if (((unsigned long)p & (PAGE_SIZE-1)) != 0) {
315 printk("sbus_free_consistent: unaligned va %p\n", p);
319 n = (n + PAGE_SIZE-1) & PAGE_MASK;
320 if ((res->end-res->start)+1 != n) {
321 printk("sbus_free_consistent: region 0x%lx asked 0x%lx\n",
322 (long)((res->end-res->start)+1), n);
326 release_resource(res);
329 /* mmu_inval_dma_area(va, n); */ /* it's consistent, isn't it */
330 pgv = virt_to_page(p);
331 mmu_unmap_dma_area(dev, ba, n);
333 __free_pages(pgv, get_order(n));
337 * Map a chunk of memory so that devices can see it.
338 * CPU view of this memory may be inconsistent with
339 * a device view and explicit flushing is necessary.
341 dma_addr_t sbus_map_single(struct device *dev, void *va, size_t len, int direction)
343 /* XXX why are some lengths signed, others unsigned? */
347 /* XXX So what is maxphys for us and how do drivers know it? */
348 if (len > 256*1024) { /* __get_free_pages() limit */
351 return mmu_get_scsi_one(dev, va, len);
354 void sbus_unmap_single(struct device *dev, dma_addr_t ba, size_t n, int direction)
356 mmu_release_scsi_one(dev, ba, n);
359 int sbus_map_sg(struct device *dev, struct scatterlist *sg, int n, int direction)
361 mmu_get_scsi_sgl(dev, sg, n);
364 * XXX sparc64 can return a partial length here. sun4c should do this
365 * but it currently panics if it can't fulfill the request - Anton
370 void sbus_unmap_sg(struct device *dev, struct scatterlist *sg, int n, int direction)
372 mmu_release_scsi_sgl(dev, sg, n);
375 void sbus_dma_sync_single_for_cpu(struct device *dev, dma_addr_t ba, size_t size, int direction)
379 void sbus_dma_sync_single_for_device(struct device *dev, dma_addr_t ba, size_t size, int direction)
383 static int __init sparc_register_ioport(void)
385 register_proc_sparc_ioport();
390 arch_initcall(sparc_register_ioport);
392 #endif /* CONFIG_SBUS */
396 /* Allocate and map kernel buffer using consistent mode DMA for a device.
397 * hwdev should be valid struct pci_dev pointer for PCI devices.
399 void *pci_alloc_consistent(struct pci_dev *pdev, size_t len, dma_addr_t *pba)
401 unsigned long len_total = (len + PAGE_SIZE-1) & PAGE_MASK;
403 struct resource *res;
409 if (len > 256*1024) { /* __get_free_pages() limit */
413 order = get_order(len_total);
414 va = __get_free_pages(GFP_KERNEL, order);
416 printk("pci_alloc_consistent: no %ld pages\n", len_total>>PAGE_SHIFT);
420 if ((res = kzalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) {
421 free_pages(va, order);
422 printk("pci_alloc_consistent: no core\n");
426 if (allocate_resource(&_sparc_dvma, res, len_total,
427 _sparc_dvma.start, _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) {
428 printk("pci_alloc_consistent: cannot occupy 0x%lx", len_total);
429 free_pages(va, order);
433 mmu_inval_dma_area(va, len_total);
435 /* P3 */ printk("pci_alloc_consistent: kva %lx uncva %lx phys %lx size %lx\n",
436 (long)va, (long)res->start, (long)virt_to_phys(va), len_total);
438 sparc_mapiorange(0, virt_to_phys(va), res->start, len_total);
440 *pba = virt_to_phys(va); /* equals virt_to_bus (R.I.P.) for us. */
441 return (void *) res->start;
443 EXPORT_SYMBOL(pci_alloc_consistent);
445 /* Free and unmap a consistent DMA buffer.
446 * cpu_addr is what was returned from pci_alloc_consistent,
447 * size must be the same as what as passed into pci_alloc_consistent,
448 * and likewise dma_addr must be the same as what *dma_addrp was set to.
450 * References to the memory and mappings associated with cpu_addr/dma_addr
451 * past this call are illegal.
453 void pci_free_consistent(struct pci_dev *pdev, size_t n, void *p, dma_addr_t ba)
455 struct resource *res;
458 if ((res = _sparc_find_resource(&_sparc_dvma,
459 (unsigned long)p)) == NULL) {
460 printk("pci_free_consistent: cannot free %p\n", p);
464 if (((unsigned long)p & (PAGE_SIZE-1)) != 0) {
465 printk("pci_free_consistent: unaligned va %p\n", p);
469 n = (n + PAGE_SIZE-1) & PAGE_MASK;
470 if ((res->end-res->start)+1 != n) {
471 printk("pci_free_consistent: region 0x%lx asked 0x%lx\n",
472 (long)((res->end-res->start)+1), (long)n);
476 pgp = (unsigned long) phys_to_virt(ba); /* bus_to_virt actually */
477 mmu_inval_dma_area(pgp, n);
478 sparc_unmapiorange((unsigned long)p, n);
480 release_resource(res);
483 free_pages(pgp, get_order(n));
485 EXPORT_SYMBOL(pci_free_consistent);
487 /* Map a single buffer of the indicated size for DMA in streaming mode.
488 * The 32-bit bus address to use is returned.
490 * Once the device is given the dma address, the device owns this memory
491 * until either pci_unmap_single or pci_dma_sync_single_* is performed.
493 dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr, size_t size,
496 BUG_ON(direction == PCI_DMA_NONE);
497 /* IIep is write-through, not flushing. */
498 return virt_to_phys(ptr);
500 EXPORT_SYMBOL(pci_map_single);
502 /* Unmap a single streaming mode DMA translation. The dma_addr and size
503 * must match what was provided for in a previous pci_map_single call. All
504 * other usages are undefined.
506 * After this call, reads by the cpu to the buffer are guaranteed to see
507 * whatever the device wrote there.
509 void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t ba, size_t size,
512 BUG_ON(direction == PCI_DMA_NONE);
513 if (direction != PCI_DMA_TODEVICE) {
514 mmu_inval_dma_area((unsigned long)phys_to_virt(ba),
515 (size + PAGE_SIZE-1) & PAGE_MASK);
518 EXPORT_SYMBOL(pci_unmap_single);
521 * Same as pci_map_single, but with pages.
523 dma_addr_t pci_map_page(struct pci_dev *hwdev, struct page *page,
524 unsigned long offset, size_t size, int direction)
526 BUG_ON(direction == PCI_DMA_NONE);
527 /* IIep is write-through, not flushing. */
528 return page_to_phys(page) + offset;
530 EXPORT_SYMBOL(pci_map_page);
532 void pci_unmap_page(struct pci_dev *hwdev,
533 dma_addr_t dma_address, size_t size, int direction)
535 BUG_ON(direction == PCI_DMA_NONE);
536 /* mmu_inval_dma_area XXX */
538 EXPORT_SYMBOL(pci_unmap_page);
540 /* Map a set of buffers described by scatterlist in streaming
541 * mode for DMA. This is the scather-gather version of the
542 * above pci_map_single interface. Here the scatter gather list
543 * elements are each tagged with the appropriate dma address
544 * and length. They are obtained via sg_dma_{address,length}(SG).
546 * NOTE: An implementation may be able to use a smaller number of
547 * DMA address/length pairs than there are SG table elements.
548 * (for example via virtual mapping capabilities)
549 * The routine returns the number of addr/length pairs actually
550 * used, at most nents.
552 * Device ownership issues as mentioned above for pci_map_single are
555 int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sgl, int nents,
558 struct scatterlist *sg;
561 BUG_ON(direction == PCI_DMA_NONE);
562 /* IIep is write-through, not flushing. */
563 for_each_sg(sgl, sg, nents, n) {
564 BUG_ON(page_address(sg_page(sg)) == NULL);
565 sg->dma_address = virt_to_phys(sg_virt(sg));
566 sg->dma_length = sg->length;
570 EXPORT_SYMBOL(pci_map_sg);
572 /* Unmap a set of streaming mode DMA translations.
573 * Again, cpu read rules concerning calls here are the same as for
574 * pci_unmap_single() above.
576 void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sgl, int nents,
579 struct scatterlist *sg;
582 BUG_ON(direction == PCI_DMA_NONE);
583 if (direction != PCI_DMA_TODEVICE) {
584 for_each_sg(sgl, sg, nents, n) {
585 BUG_ON(page_address(sg_page(sg)) == NULL);
587 (unsigned long) page_address(sg_page(sg)),
588 (sg->length + PAGE_SIZE-1) & PAGE_MASK);
592 EXPORT_SYMBOL(pci_unmap_sg);
594 /* Make physical memory consistent for a single
595 * streaming mode DMA translation before or after a transfer.
597 * If you perform a pci_map_single() but wish to interrogate the
598 * buffer using the cpu, yet do not wish to teardown the PCI dma
599 * mapping, you must call this function before doing so. At the
600 * next point you give the PCI dma address back to the card, you
601 * must first perform a pci_dma_sync_for_device, and then the
602 * device again owns the buffer.
604 void pci_dma_sync_single_for_cpu(struct pci_dev *hwdev, dma_addr_t ba, size_t size, int direction)
606 BUG_ON(direction == PCI_DMA_NONE);
607 if (direction != PCI_DMA_TODEVICE) {
608 mmu_inval_dma_area((unsigned long)phys_to_virt(ba),
609 (size + PAGE_SIZE-1) & PAGE_MASK);
612 EXPORT_SYMBOL(pci_dma_sync_single_for_cpu);
614 void pci_dma_sync_single_for_device(struct pci_dev *hwdev, dma_addr_t ba, size_t size, int direction)
616 BUG_ON(direction == PCI_DMA_NONE);
617 if (direction != PCI_DMA_TODEVICE) {
618 mmu_inval_dma_area((unsigned long)phys_to_virt(ba),
619 (size + PAGE_SIZE-1) & PAGE_MASK);
622 EXPORT_SYMBOL(pci_dma_sync_single_for_device);
624 /* Make physical memory consistent for a set of streaming
625 * mode DMA translations after a transfer.
627 * The same as pci_dma_sync_single_* but for a scatter-gather list,
628 * same rules and usage.
630 void pci_dma_sync_sg_for_cpu(struct pci_dev *hwdev, struct scatterlist *sgl, int nents, int direction)
632 struct scatterlist *sg;
635 BUG_ON(direction == PCI_DMA_NONE);
636 if (direction != PCI_DMA_TODEVICE) {
637 for_each_sg(sgl, sg, nents, n) {
638 BUG_ON(page_address(sg_page(sg)) == NULL);
640 (unsigned long) page_address(sg_page(sg)),
641 (sg->length + PAGE_SIZE-1) & PAGE_MASK);
645 EXPORT_SYMBOL(pci_dma_sync_sg_for_cpu);
647 void pci_dma_sync_sg_for_device(struct pci_dev *hwdev, struct scatterlist *sgl, int nents, int direction)
649 struct scatterlist *sg;
652 BUG_ON(direction == PCI_DMA_NONE);
653 if (direction != PCI_DMA_TODEVICE) {
654 for_each_sg(sgl, sg, nents, n) {
655 BUG_ON(page_address(sg_page(sg)) == NULL);
657 (unsigned long) page_address(sg_page(sg)),
658 (sg->length + PAGE_SIZE-1) & PAGE_MASK);
662 EXPORT_SYMBOL(pci_dma_sync_sg_for_device);
663 #endif /* CONFIG_PCI */
665 #ifdef CONFIG_PROC_FS
667 static int sparc_io_proc_show(struct seq_file *m, void *v)
669 struct resource *root = m->private, *r;
672 for (r = root->child; r != NULL; r = r->sibling) {
673 if ((nm = r->name) == 0) nm = "???";
674 seq_printf(m, "%016llx-%016llx: %s\n",
675 (unsigned long long)r->start,
676 (unsigned long long)r->end, nm);
682 static int sparc_io_proc_open(struct inode *inode, struct file *file)
684 return single_open(file, sparc_io_proc_show, PDE(inode)->data);
687 static const struct file_operations sparc_io_proc_fops = {
688 .owner = THIS_MODULE,
689 .open = sparc_io_proc_open,
692 .release = single_release,
694 #endif /* CONFIG_PROC_FS */
697 * This is a version of find_resource and it belongs to kernel/resource.c.
698 * Until we have agreement with Linus and Martin, it lingers here.
700 * XXX Too slow. Can have 8192 DVMA pages on sun4m in the worst case.
701 * This probably warrants some sort of hashing.
703 static struct resource *_sparc_find_resource(struct resource *root,
706 struct resource *tmp;
708 for (tmp = root->child; tmp != 0; tmp = tmp->sibling) {
709 if (tmp->start <= hit && tmp->end >= hit)
715 static void register_proc_sparc_ioport(void)
717 #ifdef CONFIG_PROC_FS
718 proc_create_data("io_map", 0, NULL, &sparc_io_proc_fops, &sparc_iomap);
719 proc_create_data("dvma_map", 0, NULL, &sparc_io_proc_fops, &_sparc_dvma);