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/scatterlist.h>
39 #include <linux/of_device.h>
42 #include <asm/vaddrs.h>
43 #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);
126 * Comlimentary to ioremap().
128 void iounmap(volatile void __iomem *virtual)
130 unsigned long vaddr = (unsigned long) virtual & PAGE_MASK;
131 struct resource *res;
133 if ((res = _sparc_find_resource(&sparc_iomap, vaddr)) == NULL) {
134 printk("free_io/iounmap: cannot free %lx\n", vaddr);
139 if ((char *)res >= (char*)xresv && (char *)res < (char *)&xresv[XNRES]) {
140 xres_free((struct xresource *)res);
148 void __iomem *sbus_ioremap(struct resource *phyres, unsigned long offset,
149 unsigned long size, char *name)
151 return _sparc_alloc_io(phyres->flags & 0xF,
152 phyres->start + offset, size, name);
155 void __iomem *of_ioremap(struct resource *res, unsigned long offset,
156 unsigned long size, char *name)
158 return _sparc_alloc_io(res->flags & 0xF,
162 EXPORT_SYMBOL(of_ioremap);
164 void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
168 EXPORT_SYMBOL(of_iounmap);
172 void sbus_iounmap(volatile void __iomem *addr, unsigned long size)
180 static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
181 unsigned long size, char *name)
183 static int printed_full;
184 struct xresource *xres;
185 struct resource *res;
188 void __iomem *va; /* P3 diag */
190 if (name == NULL) name = "???";
192 if ((xres = xres_alloc()) != 0) {
197 printk("ioremap: done with statics, switching to malloc\n");
201 tack = kmalloc(sizeof (struct resource) + tlen + 1, GFP_KERNEL);
202 if (tack == NULL) return NULL;
203 memset(tack, 0, sizeof(struct resource));
204 res = (struct resource *) tack;
205 tack += sizeof (struct resource);
208 strlcpy(tack, name, XNMLN+1);
211 va = _sparc_ioremap(res, busno, phys, size);
212 /* printk("ioremap(0x%x:%08lx[0x%lx])=%p\n", busno, phys, size, va); */ /* P3 diag */
218 static void __iomem *
219 _sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz)
221 unsigned long offset = ((unsigned long) pa) & (~PAGE_MASK);
223 if (allocate_resource(&sparc_iomap, res,
224 (offset + sz + PAGE_SIZE-1) & PAGE_MASK,
225 sparc_iomap.start, sparc_iomap.end, PAGE_SIZE, NULL, NULL) != 0) {
226 /* Usually we cannot see printks in this case. */
227 prom_printf("alloc_io_res(%s): cannot occupy\n",
228 (res->name != NULL)? res->name: "???");
233 sparc_mapiorange(bus, pa, res->start, res->end - res->start + 1);
235 return (void __iomem *)(unsigned long)(res->start + offset);
239 * Comlimentary to _sparc_ioremap().
241 static void _sparc_free_io(struct resource *res)
245 plen = res->end - res->start + 1;
246 BUG_ON((plen & (PAGE_SIZE-1)) != 0);
247 sparc_unmapiorange(res->start, plen);
248 release_resource(res);
253 void sbus_set_sbus64(struct device *dev, int x)
255 printk("sbus_set_sbus64: unsupported\n");
258 extern unsigned int sun4d_build_irq(struct sbus_dev *sdev, int irq);
259 void __init sbus_fill_device_irq(struct sbus_dev *sdev)
261 struct linux_prom_irqs irqs[PROMINTR_MAX];
264 len = prom_getproperty(sdev->prom_node, "intr",
265 (char *)irqs, sizeof(irqs));
267 sdev->num_irqs = len / 8;
268 if (sdev->num_irqs == 0) {
270 } else if (sparc_cpu_model == sun4d) {
271 for (len = 0; len < sdev->num_irqs; len++)
273 sun4d_build_irq(sdev, irqs[len].pri);
275 for (len = 0; len < sdev->num_irqs; len++)
276 sdev->irqs[len] = irqs[len].pri;
279 int interrupts[PROMINTR_MAX];
281 /* No "intr" node found-- check for "interrupts" node.
282 * This node contains SBus interrupt levels, not IPLs
283 * as in "intr", and no vector values. We convert
284 * SBus interrupt levels to PILs (platform specific).
286 len = prom_getproperty(sdev->prom_node, "interrupts",
287 (char *)interrupts, sizeof(interrupts));
292 sdev->num_irqs = len / sizeof(int);
293 for (len = 0; len < sdev->num_irqs; len++) {
295 sbint_to_irq(sdev, interrupts[len]);
302 * Allocate a chunk of memory suitable for DMA.
303 * Typically devices use them for control blocks.
304 * CPU may access them without any explicit flushing.
306 void *sbus_alloc_consistent(struct device *dev, long len, u32 *dma_addrp)
308 struct of_device *op = to_of_device(dev);
309 unsigned long len_total = (len + PAGE_SIZE-1) & PAGE_MASK;
311 struct resource *res;
314 /* XXX why are some lengths signed, others unsigned? */
318 /* XXX So what is maxphys for us and how do drivers know it? */
319 if (len > 256*1024) { /* __get_free_pages() limit */
323 order = get_order(len_total);
324 if ((va = __get_free_pages(GFP_KERNEL|__GFP_COMP, order)) == 0)
327 if ((res = kzalloc(sizeof(struct resource), GFP_KERNEL)) == NULL)
330 if (allocate_resource(&_sparc_dvma, res, len_total,
331 _sparc_dvma.start, _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) {
332 printk("sbus_alloc_consistent: cannot occupy 0x%lx", len_total);
335 mmu_inval_dma_area(va, len_total);
336 // XXX The mmu_map_dma_area does this for us below, see comments.
337 // sparc_mapiorange(0, virt_to_phys(va), res->start, len_total);
339 * XXX That's where sdev would be used. Currently we load
340 * all iommu tables with the same translations.
342 if (mmu_map_dma_area(dma_addrp, va, res->start, len_total) != 0)
345 res->name = op->node->name;
347 return (void *)(unsigned long)res->start;
350 release_resource(res);
352 free_pages(va, order);
359 void sbus_free_consistent(struct device *dev, long n, void *p, u32 ba)
361 struct resource *res;
364 if ((res = _sparc_find_resource(&_sparc_dvma,
365 (unsigned long)p)) == NULL) {
366 printk("sbus_free_consistent: cannot free %p\n", p);
370 if (((unsigned long)p & (PAGE_SIZE-1)) != 0) {
371 printk("sbus_free_consistent: unaligned va %p\n", p);
375 n = (n + PAGE_SIZE-1) & PAGE_MASK;
376 if ((res->end-res->start)+1 != n) {
377 printk("sbus_free_consistent: region 0x%lx asked 0x%lx\n",
378 (long)((res->end-res->start)+1), n);
382 release_resource(res);
385 /* mmu_inval_dma_area(va, n); */ /* it's consistent, isn't it */
386 pgv = virt_to_page(p);
387 mmu_unmap_dma_area(ba, n);
389 __free_pages(pgv, get_order(n));
393 * Map a chunk of memory so that devices can see it.
394 * CPU view of this memory may be inconsistent with
395 * a device view and explicit flushing is necessary.
397 dma_addr_t sbus_map_single(struct device *dev, void *va, size_t len, int direction)
399 /* XXX why are some lengths signed, others unsigned? */
403 /* XXX So what is maxphys for us and how do drivers know it? */
404 if (len > 256*1024) { /* __get_free_pages() limit */
407 return mmu_get_scsi_one(dev, va, len);
410 void sbus_unmap_single(struct device *dev, dma_addr_t ba, size_t n, int direction)
412 mmu_release_scsi_one(dev, ba, n);
415 int sbus_map_sg(struct device *dev, struct scatterlist *sg, int n, int direction)
417 mmu_get_scsi_sgl(dev, sg, n);
420 * XXX sparc64 can return a partial length here. sun4c should do this
421 * but it currently panics if it can't fulfill the request - Anton
426 void sbus_unmap_sg(struct device *dev, struct scatterlist *sg, int n, int direction)
428 mmu_release_scsi_sgl(dev, sg, n);
431 void sbus_dma_sync_single_for_cpu(struct device *dev, dma_addr_t ba, size_t size, int direction)
435 void sbus_dma_sync_single_for_device(struct device *dev, dma_addr_t ba, size_t size, int direction)
439 /* Support code for sbus_init(). */
441 * XXX This functions appears to be a distorted version of
442 * prom_sbus_ranges_init(), with all sun4d stuff cut away.
443 * Ask DaveM what is going on here, how is sun4d supposed to work... XXX
445 /* added back sun4d patch from Thomas Bogendoerfer - should be OK (crn) */
446 void __init sbus_arch_bus_ranges_init(struct device_node *pn, struct sbus_bus *sbus)
448 int parent_node = pn->node;
450 if (sparc_cpu_model == sun4d) {
451 struct linux_prom_ranges iounit_ranges[PROMREG_MAX];
452 int num_iounit_ranges, len;
454 len = prom_getproperty(parent_node, "ranges",
455 (char *) iounit_ranges,
456 sizeof (iounit_ranges));
459 (len / sizeof(struct linux_prom_ranges));
460 prom_adjust_ranges(sbus->sbus_ranges,
461 sbus->num_sbus_ranges,
462 iounit_ranges, num_iounit_ranges);
467 void __init sbus_setup_iommu(struct sbus_bus *sbus, struct device_node *dp)
470 struct device_node *parent = dp->parent;
472 if (sparc_cpu_model != sun4d &&
474 !strcmp(parent->name, "iommu"))
475 iommu_init(parent, sbus);
477 if (sparc_cpu_model == sun4d)
482 void __init sbus_setup_arch_props(struct sbus_bus *sbus, struct device_node *dp)
484 if (sparc_cpu_model == sun4d) {
485 struct device_node *parent = dp->parent;
487 sbus->devid = of_getintprop_default(parent, "device-id", 0);
488 sbus->board = of_getintprop_default(parent, "board#", 0);
492 int __init sbus_arch_preinit(void)
494 register_proc_sparc_ioport();
498 extern void sun4_dvma_init(void);
507 void __init sbus_arch_postinit(void)
509 if (sparc_cpu_model == sun4d) {
510 extern void sun4d_init_sbi_irq(void);
511 sun4d_init_sbi_irq();
514 #endif /* CONFIG_SBUS */
518 /* Allocate and map kernel buffer using consistent mode DMA for a device.
519 * hwdev should be valid struct pci_dev pointer for PCI devices.
521 void *pci_alloc_consistent(struct pci_dev *pdev, size_t len, dma_addr_t *pba)
523 unsigned long len_total = (len + PAGE_SIZE-1) & PAGE_MASK;
525 struct resource *res;
531 if (len > 256*1024) { /* __get_free_pages() limit */
535 order = get_order(len_total);
536 va = __get_free_pages(GFP_KERNEL, order);
538 printk("pci_alloc_consistent: no %ld pages\n", len_total>>PAGE_SHIFT);
542 if ((res = kzalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) {
543 free_pages(va, order);
544 printk("pci_alloc_consistent: no core\n");
548 if (allocate_resource(&_sparc_dvma, res, len_total,
549 _sparc_dvma.start, _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) {
550 printk("pci_alloc_consistent: cannot occupy 0x%lx", len_total);
551 free_pages(va, order);
555 mmu_inval_dma_area(va, len_total);
557 /* P3 */ printk("pci_alloc_consistent: kva %lx uncva %lx phys %lx size %lx\n",
558 (long)va, (long)res->start, (long)virt_to_phys(va), len_total);
560 sparc_mapiorange(0, virt_to_phys(va), res->start, len_total);
562 *pba = virt_to_phys(va); /* equals virt_to_bus (R.I.P.) for us. */
563 return (void *) res->start;
566 /* Free and unmap a consistent DMA buffer.
567 * cpu_addr is what was returned from pci_alloc_consistent,
568 * size must be the same as what as passed into pci_alloc_consistent,
569 * and likewise dma_addr must be the same as what *dma_addrp was set to.
571 * References to the memory and mappings associated with cpu_addr/dma_addr
572 * past this call are illegal.
574 void pci_free_consistent(struct pci_dev *pdev, size_t n, void *p, dma_addr_t ba)
576 struct resource *res;
579 if ((res = _sparc_find_resource(&_sparc_dvma,
580 (unsigned long)p)) == NULL) {
581 printk("pci_free_consistent: cannot free %p\n", p);
585 if (((unsigned long)p & (PAGE_SIZE-1)) != 0) {
586 printk("pci_free_consistent: unaligned va %p\n", p);
590 n = (n + PAGE_SIZE-1) & PAGE_MASK;
591 if ((res->end-res->start)+1 != n) {
592 printk("pci_free_consistent: region 0x%lx asked 0x%lx\n",
593 (long)((res->end-res->start)+1), (long)n);
597 pgp = (unsigned long) phys_to_virt(ba); /* bus_to_virt actually */
598 mmu_inval_dma_area(pgp, n);
599 sparc_unmapiorange((unsigned long)p, n);
601 release_resource(res);
604 free_pages(pgp, get_order(n));
607 /* Map a single buffer of the indicated size for DMA in streaming mode.
608 * The 32-bit bus address to use is returned.
610 * Once the device is given the dma address, the device owns this memory
611 * until either pci_unmap_single or pci_dma_sync_single_* is performed.
613 dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr, size_t size,
616 BUG_ON(direction == PCI_DMA_NONE);
617 /* IIep is write-through, not flushing. */
618 return virt_to_phys(ptr);
621 /* Unmap a single streaming mode DMA translation. The dma_addr and size
622 * must match what was provided for in a previous pci_map_single call. All
623 * other usages are undefined.
625 * After this call, reads by the cpu to the buffer are guaranteed to see
626 * whatever the device wrote there.
628 void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t ba, size_t size,
631 BUG_ON(direction == PCI_DMA_NONE);
632 if (direction != PCI_DMA_TODEVICE) {
633 mmu_inval_dma_area((unsigned long)phys_to_virt(ba),
634 (size + PAGE_SIZE-1) & PAGE_MASK);
639 * Same as pci_map_single, but with pages.
641 dma_addr_t pci_map_page(struct pci_dev *hwdev, struct page *page,
642 unsigned long offset, size_t size, int direction)
644 BUG_ON(direction == PCI_DMA_NONE);
645 /* IIep is write-through, not flushing. */
646 return page_to_phys(page) + offset;
649 void pci_unmap_page(struct pci_dev *hwdev,
650 dma_addr_t dma_address, size_t size, int direction)
652 BUG_ON(direction == PCI_DMA_NONE);
653 /* mmu_inval_dma_area XXX */
656 /* Map a set of buffers described by scatterlist in streaming
657 * mode for DMA. This is the scather-gather version of the
658 * above pci_map_single interface. Here the scatter gather list
659 * elements are each tagged with the appropriate dma address
660 * and length. They are obtained via sg_dma_{address,length}(SG).
662 * NOTE: An implementation may be able to use a smaller number of
663 * DMA address/length pairs than there are SG table elements.
664 * (for example via virtual mapping capabilities)
665 * The routine returns the number of addr/length pairs actually
666 * used, at most nents.
668 * Device ownership issues as mentioned above for pci_map_single are
671 int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sgl, int nents,
674 struct scatterlist *sg;
677 BUG_ON(direction == PCI_DMA_NONE);
678 /* IIep is write-through, not flushing. */
679 for_each_sg(sgl, sg, nents, n) {
680 BUG_ON(page_address(sg_page(sg)) == NULL);
681 sg->dvma_address = virt_to_phys(sg_virt(sg));
682 sg->dvma_length = sg->length;
687 /* Unmap a set of streaming mode DMA translations.
688 * Again, cpu read rules concerning calls here are the same as for
689 * pci_unmap_single() above.
691 void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sgl, int nents,
694 struct scatterlist *sg;
697 BUG_ON(direction == PCI_DMA_NONE);
698 if (direction != PCI_DMA_TODEVICE) {
699 for_each_sg(sgl, sg, nents, n) {
700 BUG_ON(page_address(sg_page(sg)) == NULL);
702 (unsigned long) page_address(sg_page(sg)),
703 (sg->length + PAGE_SIZE-1) & PAGE_MASK);
708 /* Make physical memory consistent for a single
709 * streaming mode DMA translation before or after a transfer.
711 * If you perform a pci_map_single() but wish to interrogate the
712 * buffer using the cpu, yet do not wish to teardown the PCI dma
713 * mapping, you must call this function before doing so. At the
714 * next point you give the PCI dma address back to the card, you
715 * must first perform a pci_dma_sync_for_device, and then the
716 * device again owns the buffer.
718 void pci_dma_sync_single_for_cpu(struct pci_dev *hwdev, dma_addr_t ba, size_t size, int direction)
720 BUG_ON(direction == PCI_DMA_NONE);
721 if (direction != PCI_DMA_TODEVICE) {
722 mmu_inval_dma_area((unsigned long)phys_to_virt(ba),
723 (size + PAGE_SIZE-1) & PAGE_MASK);
727 void pci_dma_sync_single_for_device(struct pci_dev *hwdev, dma_addr_t ba, size_t size, int direction)
729 BUG_ON(direction == PCI_DMA_NONE);
730 if (direction != PCI_DMA_TODEVICE) {
731 mmu_inval_dma_area((unsigned long)phys_to_virt(ba),
732 (size + PAGE_SIZE-1) & PAGE_MASK);
736 /* Make physical memory consistent for a set of streaming
737 * mode DMA translations after a transfer.
739 * The same as pci_dma_sync_single_* but for a scatter-gather list,
740 * same rules and usage.
742 void pci_dma_sync_sg_for_cpu(struct pci_dev *hwdev, struct scatterlist *sgl, int nents, int direction)
744 struct scatterlist *sg;
747 BUG_ON(direction == PCI_DMA_NONE);
748 if (direction != PCI_DMA_TODEVICE) {
749 for_each_sg(sgl, sg, nents, n) {
750 BUG_ON(page_address(sg_page(sg)) == NULL);
752 (unsigned long) page_address(sg_page(sg)),
753 (sg->length + PAGE_SIZE-1) & PAGE_MASK);
758 void pci_dma_sync_sg_for_device(struct pci_dev *hwdev, struct scatterlist *sgl, int nents, int direction)
760 struct scatterlist *sg;
763 BUG_ON(direction == PCI_DMA_NONE);
764 if (direction != PCI_DMA_TODEVICE) {
765 for_each_sg(sgl, sg, nents, n) {
766 BUG_ON(page_address(sg_page(sg)) == NULL);
768 (unsigned long) page_address(sg_page(sg)),
769 (sg->length + PAGE_SIZE-1) & PAGE_MASK);
773 #endif /* CONFIG_PCI */
775 #ifdef CONFIG_PROC_FS
778 _sparc_io_get_info(char *buf, char **start, off_t fpos, int length, int *eof,
781 char *p = buf, *e = buf + length;
785 for (r = ((struct resource *)data)->child; r != NULL; r = r->sibling) {
786 if (p + 32 >= e) /* Better than nothing */
788 if ((nm = r->name) == 0) nm = "???";
789 p += sprintf(p, "%016llx-%016llx: %s\n",
790 (unsigned long long)r->start,
791 (unsigned long long)r->end, nm);
797 #endif /* CONFIG_PROC_FS */
800 * This is a version of find_resource and it belongs to kernel/resource.c.
801 * Until we have agreement with Linus and Martin, it lingers here.
803 * XXX Too slow. Can have 8192 DVMA pages on sun4m in the worst case.
804 * This probably warrants some sort of hashing.
806 static struct resource *_sparc_find_resource(struct resource *root,
809 struct resource *tmp;
811 for (tmp = root->child; tmp != 0; tmp = tmp->sibling) {
812 if (tmp->start <= hit && tmp->end >= hit)
818 static void register_proc_sparc_ioport(void)
820 #ifdef CONFIG_PROC_FS
821 create_proc_read_entry("io_map",0,NULL,_sparc_io_get_info,&sparc_iomap);
822 create_proc_read_entry("dvma_map",0,NULL,_sparc_io_get_info,&_sparc_dvma);