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Diffstat (limited to 'arch/sparc/kernel/ioport.c')
| -rw-r--r-- | arch/sparc/kernel/ioport.c | 731 |
1 files changed, 731 insertions, 0 deletions
diff --git a/arch/sparc/kernel/ioport.c b/arch/sparc/kernel/ioport.c new file mode 100644 index 000000000000..d0f2bd227c4c --- /dev/null +++ b/arch/sparc/kernel/ioport.c @@ -0,0 +1,731 @@ +/* $Id: ioport.c,v 1.45 2001/10/30 04:54:21 davem Exp $ + * ioport.c: Simple io mapping allocator. + * + * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) + * Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx) + * + * 1996: sparc_free_io, 1999: ioremap()/iounmap() by Pete Zaitcev. + * + * 2000/01/29 + * <rth> zait: as long as pci_alloc_consistent produces something addressable, + * things are ok. + * <zaitcev> rth: no, it is relevant, because get_free_pages returns you a + * pointer into the big page mapping + * <rth> zait: so what? + * <rth> zait: remap_it_my_way(virt_to_phys(get_free_page())) + * <zaitcev> Hmm + * <zaitcev> Suppose I did this remap_it_my_way(virt_to_phys(get_free_page())). + * So far so good. + * <zaitcev> Now, driver calls pci_free_consistent(with result of + * remap_it_my_way()). + * <zaitcev> How do you find the address to pass to free_pages()? + * <rth> zait: walk the page tables? It's only two or three level after all. + * <rth> zait: you have to walk them anyway to remove the mapping. + * <zaitcev> Hmm + * <zaitcev> Sounds reasonable + */ + +#include <linux/config.h> +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/types.h> +#include <linux/ioport.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/pci.h> /* struct pci_dev */ +#include <linux/proc_fs.h> + +#include <asm/io.h> +#include <asm/vaddrs.h> +#include <asm/oplib.h> +#include <asm/page.h> +#include <asm/pgalloc.h> +#include <asm/dma.h> + +#define mmu_inval_dma_area(p, l) /* Anton pulled it out for 2.4.0-xx */ + +struct resource *_sparc_find_resource(struct resource *r, unsigned long); + +static void __iomem *_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz); +static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys, + unsigned long size, char *name); +static void _sparc_free_io(struct resource *res); + +/* This points to the next to use virtual memory for DVMA mappings */ +static struct resource _sparc_dvma = { + .name = "sparc_dvma", .start = DVMA_VADDR, .end = DVMA_END - 1 +}; +/* This points to the start of I/O mappings, cluable from outside. */ +/*ext*/ struct resource sparc_iomap = { + .name = "sparc_iomap", .start = IOBASE_VADDR, .end = IOBASE_END - 1 +}; + +/* + * Our mini-allocator... + * Boy this is gross! We need it because we must map I/O for + * timers and interrupt controller before the kmalloc is available. + */ + +#define XNMLN 15 +#define XNRES 10 /* SS-10 uses 8 */ + +struct xresource { + struct resource xres; /* Must be first */ + int xflag; /* 1 == used */ + char xname[XNMLN+1]; +}; + +static struct xresource xresv[XNRES]; + +static struct xresource *xres_alloc(void) { + struct xresource *xrp; + int n; + + xrp = xresv; + for (n = 0; n < XNRES; n++) { + if (xrp->xflag == 0) { + xrp->xflag = 1; + return xrp; + } + xrp++; + } + return NULL; +} + +static void xres_free(struct xresource *xrp) { + xrp->xflag = 0; +} + +/* + * These are typically used in PCI drivers + * which are trying to be cross-platform. + * + * Bus type is always zero on IIep. + */ +void __iomem *ioremap(unsigned long offset, unsigned long size) +{ + char name[14]; + + sprintf(name, "phys_%08x", (u32)offset); + return _sparc_alloc_io(0, offset, size, name); +} + +/* + * Comlimentary to ioremap(). + */ +void iounmap(volatile void __iomem *virtual) +{ + unsigned long vaddr = (unsigned long) virtual & PAGE_MASK; + struct resource *res; + + if ((res = _sparc_find_resource(&sparc_iomap, vaddr)) == NULL) { + printk("free_io/iounmap: cannot free %lx\n", vaddr); + return; + } + _sparc_free_io(res); + + if ((char *)res >= (char*)xresv && (char *)res < (char *)&xresv[XNRES]) { + xres_free((struct xresource *)res); + } else { + kfree(res); + } +} + +/* + */ +void __iomem *sbus_ioremap(struct resource *phyres, unsigned long offset, + unsigned long size, char *name) +{ + return _sparc_alloc_io(phyres->flags & 0xF, + phyres->start + offset, size, name); +} + +/* + */ +void sbus_iounmap(volatile void __iomem *addr, unsigned long size) +{ + iounmap(addr); +} + +/* + * Meat of mapping + */ +static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys, + unsigned long size, char *name) +{ + static int printed_full; + struct xresource *xres; + struct resource *res; + char *tack; + int tlen; + void __iomem *va; /* P3 diag */ + + if (name == NULL) name = "???"; + + if ((xres = xres_alloc()) != 0) { + tack = xres->xname; + res = &xres->xres; + } else { + if (!printed_full) { + printk("ioremap: done with statics, switching to malloc\n"); + printed_full = 1; + } + tlen = strlen(name); + tack = kmalloc(sizeof (struct resource) + tlen + 1, GFP_KERNEL); + if (tack == NULL) return NULL; + memset(tack, 0, sizeof(struct resource)); + res = (struct resource *) tack; + tack += sizeof (struct resource); + } + + strlcpy(tack, name, XNMLN+1); + res->name = tack; + + va = _sparc_ioremap(res, busno, phys, size); + /* printk("ioremap(0x%x:%08lx[0x%lx])=%p\n", busno, phys, size, va); */ /* P3 diag */ + return va; +} + +/* + */ +static void __iomem * +_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz) +{ + unsigned long offset = ((unsigned long) pa) & (~PAGE_MASK); + + if (allocate_resource(&sparc_iomap, res, + (offset + sz + PAGE_SIZE-1) & PAGE_MASK, + sparc_iomap.start, sparc_iomap.end, PAGE_SIZE, NULL, NULL) != 0) { + /* Usually we cannot see printks in this case. */ + prom_printf("alloc_io_res(%s): cannot occupy\n", + (res->name != NULL)? res->name: "???"); + prom_halt(); + } + + pa &= PAGE_MASK; + sparc_mapiorange(bus, pa, res->start, res->end - res->start + 1); + + return (void __iomem *) (res->start + offset); +} + +/* + * Comlimentary to _sparc_ioremap(). + */ +static void _sparc_free_io(struct resource *res) +{ + unsigned long plen; + + plen = res->end - res->start + 1; + if ((plen & (PAGE_SIZE-1)) != 0) BUG(); + sparc_unmapiorange(res->start, plen); + release_resource(res); +} + +#ifdef CONFIG_SBUS + +void sbus_set_sbus64(struct sbus_dev *sdev, int x) { + printk("sbus_set_sbus64: unsupported\n"); +} + +/* + * Allocate a chunk of memory suitable for DMA. + * Typically devices use them for control blocks. + * CPU may access them without any explicit flushing. + * + * XXX Some clever people know that sdev is not used and supply NULL. Watch. + */ +void *sbus_alloc_consistent(struct sbus_dev *sdev, long len, u32 *dma_addrp) +{ + unsigned long len_total = (len + PAGE_SIZE-1) & PAGE_MASK; + unsigned long va; + struct resource *res; + int order; + + /* XXX why are some lenghts signed, others unsigned? */ + if (len <= 0) { + return NULL; + } + /* XXX So what is maxphys for us and how do drivers know it? */ + if (len > 256*1024) { /* __get_free_pages() limit */ + return NULL; + } + + order = get_order(len_total); + if ((va = __get_free_pages(GFP_KERNEL, order)) == 0) + goto err_nopages; + + if ((res = kmalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) + goto err_nomem; + memset((char*)res, 0, sizeof(struct resource)); + + if (allocate_resource(&_sparc_dvma, res, len_total, + _sparc_dvma.start, _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) { + printk("sbus_alloc_consistent: cannot occupy 0x%lx", len_total); + goto err_nova; + } + mmu_inval_dma_area(va, len_total); + // XXX The mmu_map_dma_area does this for us below, see comments. + // sparc_mapiorange(0, virt_to_phys(va), res->start, len_total); + /* + * XXX That's where sdev would be used. Currently we load + * all iommu tables with the same translations. + */ + if (mmu_map_dma_area(dma_addrp, va, res->start, len_total) != 0) + goto err_noiommu; + + return (void *)res->start; + +err_noiommu: + release_resource(res); +err_nova: + free_pages(va, order); +err_nomem: + kfree(res); +err_nopages: + return NULL; +} + +void sbus_free_consistent(struct sbus_dev *sdev, long n, void *p, u32 ba) +{ + struct resource *res; + struct page *pgv; + + if ((res = _sparc_find_resource(&_sparc_dvma, + (unsigned long)p)) == NULL) { + printk("sbus_free_consistent: cannot free %p\n", p); + return; + } + + if (((unsigned long)p & (PAGE_SIZE-1)) != 0) { + printk("sbus_free_consistent: unaligned va %p\n", p); + return; + } + + n = (n + PAGE_SIZE-1) & PAGE_MASK; + if ((res->end-res->start)+1 != n) { + printk("sbus_free_consistent: region 0x%lx asked 0x%lx\n", + (long)((res->end-res->start)+1), n); + return; + } + + release_resource(res); + kfree(res); + + /* mmu_inval_dma_area(va, n); */ /* it's consistent, isn't it */ + pgv = mmu_translate_dvma(ba); + mmu_unmap_dma_area(ba, n); + + __free_pages(pgv, get_order(n)); +} + +/* + * Map a chunk of memory so that devices can see it. + * CPU view of this memory may be inconsistent with + * a device view and explicit flushing is necessary. + */ +dma_addr_t sbus_map_single(struct sbus_dev *sdev, void *va, size_t len, int direction) +{ + /* XXX why are some lenghts signed, others unsigned? */ + if (len <= 0) { + return 0; + } + /* XXX So what is maxphys for us and how do drivers know it? */ + if (len > 256*1024) { /* __get_free_pages() limit */ + return 0; + } + return mmu_get_scsi_one(va, len, sdev->bus); +} + +void sbus_unmap_single(struct sbus_dev *sdev, dma_addr_t ba, size_t n, int direction) +{ + mmu_release_scsi_one(ba, n, sdev->bus); +} + +int sbus_map_sg(struct sbus_dev *sdev, struct scatterlist *sg, int n, int direction) +{ + mmu_get_scsi_sgl(sg, n, sdev->bus); + + /* + * XXX sparc64 can return a partial length here. sun4c should do this + * but it currently panics if it can't fulfill the request - Anton + */ + return n; +} + +void sbus_unmap_sg(struct sbus_dev *sdev, struct scatterlist *sg, int n, int direction) +{ + mmu_release_scsi_sgl(sg, n, sdev->bus); +} + +/* + */ +void sbus_dma_sync_single_for_cpu(struct sbus_dev *sdev, dma_addr_t ba, size_t size, int direction) +{ +#if 0 + unsigned long va; + struct resource *res; + + /* We do not need the resource, just print a message if invalid. */ + res = _sparc_find_resource(&_sparc_dvma, ba); + if (res == NULL) + panic("sbus_dma_sync_single: 0x%x\n", ba); + + va = page_address(mmu_translate_dvma(ba)); /* XXX higmem */ + /* + * XXX This bogosity will be fixed with the iommu rewrite coming soon + * to a kernel near you. - Anton + */ + /* mmu_inval_dma_area(va, (size + PAGE_SIZE-1) & PAGE_MASK); */ +#endif +} + +void sbus_dma_sync_single_for_device(struct sbus_dev *sdev, dma_addr_t ba, size_t size, int direction) +{ +#if 0 + unsigned long va; + struct resource *res; + + /* We do not need the resource, just print a message if invalid. */ + res = _sparc_find_resource(&_sparc_dvma, ba); + if (res == NULL) + panic("sbus_dma_sync_single: 0x%x\n", ba); + + va = page_address(mmu_translate_dvma(ba)); /* XXX higmem */ + /* + * XXX This bogosity will be fixed with the iommu rewrite coming soon + * to a kernel near you. - Anton + */ + /* mmu_inval_dma_area(va, (size + PAGE_SIZE-1) & PAGE_MASK); */ +#endif +} + +void sbus_dma_sync_sg_for_cpu(struct sbus_dev *sdev, struct scatterlist *sg, int n, int direction) +{ + printk("sbus_dma_sync_sg_for_cpu: not implemented yet\n"); +} + +void sbus_dma_sync_sg_for_device(struct sbus_dev *sdev, struct scatterlist *sg, int n, int direction) +{ + printk("sbus_dma_sync_sg_for_device: not implemented yet\n"); +} +#endif /* CONFIG_SBUS */ + +#ifdef CONFIG_PCI + +/* Allocate and map kernel buffer using consistent mode DMA for a device. + * hwdev should be valid struct pci_dev pointer for PCI devices. + */ +void *pci_alloc_consistent(struct pci_dev *pdev, size_t len, dma_addr_t *pba) +{ + unsigned long len_total = (len + PAGE_SIZE-1) & PAGE_MASK; + unsigned long va; + struct resource *res; + int order; + + if (len == 0) { + return NULL; + } + if (len > 256*1024) { /* __get_free_pages() limit */ + return NULL; + } + + order = get_order(len_total); + va = __get_free_pages(GFP_KERNEL, order); + if (va == 0) { + printk("pci_alloc_consistent: no %ld pages\n", len_total>>PAGE_SHIFT); + return NULL; + } + + if ((res = kmalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) { + free_pages(va, order); + printk("pci_alloc_consistent: no core\n"); + return NULL; + } + memset((char*)res, 0, sizeof(struct resource)); + + if (allocate_resource(&_sparc_dvma, res, len_total, + _sparc_dvma.start, _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) { + printk("pci_alloc_consistent: cannot occupy 0x%lx", len_total); + free_pages(va, order); + kfree(res); + return NULL; + } + mmu_inval_dma_area(va, len_total); +#if 0 +/* P3 */ printk("pci_alloc_consistent: kva %lx uncva %lx phys %lx size %lx\n", + (long)va, (long)res->start, (long)virt_to_phys(va), len_total); +#endif + sparc_mapiorange(0, virt_to_phys(va), res->start, len_total); + + *pba = virt_to_phys(va); /* equals virt_to_bus (R.I.P.) for us. */ + return (void *) res->start; +} + +/* Free and unmap a consistent DMA buffer. + * cpu_addr is what was returned from pci_alloc_consistent, + * size must be the same as what as passed into pci_alloc_consistent, + * and likewise dma_addr must be the same as what *dma_addrp was set to. + * + * References to the memory and mappings assosciated with cpu_addr/dma_addr + * past this call are illegal. + */ +void pci_free_consistent(struct pci_dev *pdev, size_t n, void *p, dma_addr_t ba) +{ + struct resource *res; + unsigned long pgp; + + if ((res = _sparc_find_resource(&_sparc_dvma, + (unsigned long)p)) == NULL) { + printk("pci_free_consistent: cannot free %p\n", p); + return; + } + + if (((unsigned long)p & (PAGE_SIZE-1)) != 0) { + printk("pci_free_consistent: unaligned va %p\n", p); + return; + } + + n = (n + PAGE_SIZE-1) & PAGE_MASK; + if ((res->end-res->start)+1 != n) { + printk("pci_free_consistent: region 0x%lx asked 0x%lx\n", + (long)((res->end-res->start)+1), (long)n); + return; + } + + pgp = (unsigned long) phys_to_virt(ba); /* bus_to_virt actually */ + mmu_inval_dma_area(pgp, n); + sparc_unmapiorange((unsigned long)p, n); + + release_resource(res); + kfree(res); + + free_pages(pgp, get_order(n)); +} + +/* Map a single buffer of the indicated size for DMA in streaming mode. + * The 32-bit bus address to use is returned. + * + * Once the device is given the dma address, the device owns this memory + * until either pci_unmap_single or pci_dma_sync_single_* is performed. + */ +dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr, size_t size, + int direction) +{ + if (direction == PCI_DMA_NONE) + BUG(); + /* IIep is write-through, not flushing. */ + return virt_to_phys(ptr); +} + +/* Unmap a single streaming mode DMA translation. The dma_addr and size + * must match what was provided for in a previous pci_map_single call. All + * other usages are undefined. + * + * After this call, reads by the cpu to the buffer are guaranteed to see + * whatever the device wrote there. + */ +void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t ba, size_t size, + int direction) +{ + if (direction == PCI_DMA_NONE) + BUG(); + if (direction != PCI_DMA_TODEVICE) { + mmu_inval_dma_area((unsigned long)phys_to_virt(ba), + (size + PAGE_SIZE-1) & PAGE_MASK); + } +} + +/* + * Same as pci_map_single, but with pages. + */ +dma_addr_t pci_map_page(struct pci_dev *hwdev, struct page *page, + unsigned long offset, size_t size, int direction) +{ + if (direction == PCI_DMA_NONE) + BUG(); + /* IIep is write-through, not flushing. */ + return page_to_phys(page) + offset; +} + +void pci_unmap_page(struct pci_dev *hwdev, + dma_addr_t dma_address, size_t size, int direction) +{ + if (direction == PCI_DMA_NONE) + BUG(); + /* mmu_inval_dma_area XXX */ +} + +/* Map a set of buffers described by scatterlist in streaming + * mode for DMA. This is the scather-gather version of the + * above pci_map_single interface. Here the scatter gather list + * elements are each tagged with the appropriate dma address + * and length. They are obtained via sg_dma_{address,length}(SG). + * + * NOTE: An implementation may be able to use a smaller number of + * DMA address/length pairs than there are SG table elements. + * (for example via virtual mapping capabilities) + * The routine returns the number of addr/length pairs actually + * used, at most nents. + * + * Device ownership issues as mentioned above for pci_map_single are + * the same here. + */ +int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents, + int direction) +{ + int n; + + if (direction == PCI_DMA_NONE) + BUG(); + /* IIep is write-through, not flushing. */ + for (n = 0; n < nents; n++) { + if (page_address(sg->page) == NULL) BUG(); + sg->dvma_address = virt_to_phys(page_address(sg->page)); + sg->dvma_length = sg->length; + sg++; + } + return nents; +} + +/* Unmap a set of streaming mode DMA translations. + * Again, cpu read rules concerning calls here are the same as for + * pci_unmap_single() above. + */ +void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents, + int direction) +{ + int n; + + if (direction == PCI_DMA_NONE) + BUG(); + if (direction != PCI_DMA_TODEVICE) { + for (n = 0; n < nents; n++) { + if (page_address(sg->page) == NULL) BUG(); + mmu_inval_dma_area( + (unsigned long) page_address(sg->page), + (sg->length + PAGE_SIZE-1) & PAGE_MASK); + sg++; + } + } +} + +/* Make physical memory consistent for a single + * streaming mode DMA translation before or after a transfer. + * + * If you perform a pci_map_single() but wish to interrogate the + * buffer using the cpu, yet do not wish to teardown the PCI dma + * mapping, you must call this function before doing so. At the + * next point you give the PCI dma address back to the card, you + * must first perform a pci_dma_sync_for_device, and then the + * device again owns the buffer. + */ +void pci_dma_sync_single_for_cpu(struct pci_dev *hwdev, dma_addr_t ba, size_t size, int direction) +{ + if (direction == PCI_DMA_NONE) + BUG(); + if (direction != PCI_DMA_TODEVICE) { + mmu_inval_dma_area((unsigned long)phys_to_virt(ba), + (size + PAGE_SIZE-1) & PAGE_MASK); + } +} + +void pci_dma_sync_single_for_device(struct pci_dev *hwdev, dma_addr_t ba, size_t size, int direction) +{ + if (direction == PCI_DMA_NONE) + BUG(); + if (direction != PCI_DMA_TODEVICE) { + mmu_inval_dma_area((unsigned long)phys_to_virt(ba), + (size + PAGE_SIZE-1) & PAGE_MASK); + } +} + +/* Make physical memory consistent for a set of streaming + * mode DMA translations after a transfer. + * + * The same as pci_dma_sync_single_* but for a scatter-gather list, + * same rules and usage. + */ +void pci_dma_sync_sg_for_cpu(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction) +{ + int n; + + if (direction == PCI_DMA_NONE) + BUG(); + if (direction != PCI_DMA_TODEVICE) { + for (n = 0; n < nents; n++) { + if (page_address(sg->page) == NULL) BUG(); + mmu_inval_dma_area( + (unsigned long) page_address(sg->page), + (sg->length + PAGE_SIZE-1) & PAGE_MASK); + sg++; + } + } +} + +void pci_dma_sync_sg_for_device(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction) +{ + int n; + + if (direction == PCI_DMA_NONE) + BUG(); + if (direction != PCI_DMA_TODEVICE) { + for (n = 0; n < nents; n++) { + if (page_address(sg->page) == NULL) BUG(); + mmu_inval_dma_area( + (unsigned long) page_address(sg->page), + (sg->length + PAGE_SIZE-1) & PAGE_MASK); + sg++; + } + } +} +#endif /* CONFIG_PCI */ + +#ifdef CONFIG_PROC_FS + +static int +_sparc_io_get_info(char *buf, char **start, off_t fpos, int length, int *eof, + void *data) +{ + char *p = buf, *e = buf + length; + struct resource *r; + const char *nm; + + for (r = ((struct resource *)data)->child; r != NULL; r = r->sibling) { + if (p + 32 >= e) /* Better than nothing */ + break; + if ((nm = r->name) == 0) nm = "???"; + p += sprintf(p, "%08lx-%08lx: %s\n", r->start, r->end, nm); + } + + return p-buf; +} + +#endif /* CONFIG_PROC_FS */ + +/* + * This is a version of find_resource and it belongs to kernel/resource.c. + * Until we have agreement with Linus and Martin, it lingers here. + * + * XXX Too slow. Can have 8192 DVMA pages on sun4m in the worst case. + * This probably warrants some sort of hashing. + */ +struct resource * +_sparc_find_resource(struct resource *root, unsigned long hit) +{ + struct resource *tmp; + + for (tmp = root->child; tmp != 0; tmp = tmp->sibling) { + if (tmp->start <= hit && tmp->end >= hit) + return tmp; + } + return NULL; +} + +void register_proc_sparc_ioport(void) +{ +#ifdef CONFIG_PROC_FS + create_proc_read_entry("io_map",0,NULL,_sparc_io_get_info,&sparc_iomap); + create_proc_read_entry("dvma_map",0,NULL,_sparc_io_get_info,&_sparc_dvma); +#endif +} |