406 lines
10 KiB
C
406 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* ioport.c: Simple io mapping allocator.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
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*
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* 1996: sparc_free_io, 1999: ioremap()/iounmap() by Pete Zaitcev.
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*
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* 2000/01/29
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* <rth> zait: as long as pci_alloc_consistent produces something addressable,
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* things are ok.
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* <zaitcev> rth: no, it is relevant, because get_free_pages returns you a
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* pointer into the big page mapping
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* <rth> zait: so what?
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* <rth> zait: remap_it_my_way(virt_to_phys(get_free_page()))
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* <zaitcev> Hmm
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* <zaitcev> Suppose I did this remap_it_my_way(virt_to_phys(get_free_page())).
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* So far so good.
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* <zaitcev> Now, driver calls pci_free_consistent(with result of
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* remap_it_my_way()).
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* <zaitcev> How do you find the address to pass to free_pages()?
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* <rth> zait: walk the page tables? It's only two or three level after all.
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* <rth> zait: you have to walk them anyway to remove the mapping.
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* <zaitcev> Hmm
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* <zaitcev> Sounds reasonable
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*/
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/ioport.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/pci.h> /* struct pci_dev */
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/scatterlist.h>
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#include <linux/dma-noncoherent.h>
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#include <linux/of_device.h>
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#include <asm/io.h>
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#include <asm/vaddrs.h>
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#include <asm/oplib.h>
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#include <asm/prom.h>
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#include <asm/page.h>
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#include <asm/pgalloc.h>
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#include <asm/dma.h>
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#include <asm/iommu.h>
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#include <asm/io-unit.h>
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#include <asm/leon.h>
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/* This function must make sure that caches and memory are coherent after DMA
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* On LEON systems without cache snooping it flushes the entire D-CACHE.
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*/
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static inline void dma_make_coherent(unsigned long pa, unsigned long len)
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{
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if (sparc_cpu_model == sparc_leon) {
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if (!sparc_leon3_snooping_enabled())
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leon_flush_dcache_all();
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}
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}
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static void __iomem *_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz);
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static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
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unsigned long size, char *name);
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static void _sparc_free_io(struct resource *res);
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static void register_proc_sparc_ioport(void);
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/* This points to the next to use virtual memory for DVMA mappings */
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static struct resource _sparc_dvma = {
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.name = "sparc_dvma", .start = DVMA_VADDR, .end = DVMA_END - 1
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};
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/* This points to the start of I/O mappings, cluable from outside. */
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/*ext*/ struct resource sparc_iomap = {
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.name = "sparc_iomap", .start = IOBASE_VADDR, .end = IOBASE_END - 1
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};
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/*
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* Our mini-allocator...
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* Boy this is gross! We need it because we must map I/O for
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* timers and interrupt controller before the kmalloc is available.
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*/
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#define XNMLN 15
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#define XNRES 10 /* SS-10 uses 8 */
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struct xresource {
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struct resource xres; /* Must be first */
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int xflag; /* 1 == used */
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char xname[XNMLN+1];
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};
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static struct xresource xresv[XNRES];
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static struct xresource *xres_alloc(void) {
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struct xresource *xrp;
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int n;
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xrp = xresv;
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for (n = 0; n < XNRES; n++) {
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if (xrp->xflag == 0) {
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xrp->xflag = 1;
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return xrp;
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}
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xrp++;
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}
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return NULL;
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}
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static void xres_free(struct xresource *xrp) {
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xrp->xflag = 0;
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}
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/*
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* These are typically used in PCI drivers
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* which are trying to be cross-platform.
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*
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* Bus type is always zero on IIep.
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*/
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void __iomem *ioremap(phys_addr_t offset, size_t size)
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{
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char name[14];
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sprintf(name, "phys_%08x", (u32)offset);
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return _sparc_alloc_io(0, (unsigned long)offset, size, name);
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}
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EXPORT_SYMBOL(ioremap);
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/*
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* Complementary to ioremap().
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*/
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void iounmap(volatile void __iomem *virtual)
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{
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unsigned long vaddr = (unsigned long) virtual & PAGE_MASK;
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struct resource *res;
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/*
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* XXX Too slow. Can have 8192 DVMA pages on sun4m in the worst case.
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* This probably warrants some sort of hashing.
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*/
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if ((res = lookup_resource(&sparc_iomap, vaddr)) == NULL) {
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printk("free_io/iounmap: cannot free %lx\n", vaddr);
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return;
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}
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_sparc_free_io(res);
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if ((char *)res >= (char*)xresv && (char *)res < (char *)&xresv[XNRES]) {
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xres_free((struct xresource *)res);
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} else {
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kfree(res);
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}
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}
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EXPORT_SYMBOL(iounmap);
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void __iomem *of_ioremap(struct resource *res, unsigned long offset,
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unsigned long size, char *name)
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{
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return _sparc_alloc_io(res->flags & 0xF,
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res->start + offset,
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size, name);
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}
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EXPORT_SYMBOL(of_ioremap);
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void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
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{
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iounmap(base);
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}
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EXPORT_SYMBOL(of_iounmap);
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/*
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* Meat of mapping
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*/
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static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
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unsigned long size, char *name)
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{
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static int printed_full;
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struct xresource *xres;
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struct resource *res;
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char *tack;
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int tlen;
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void __iomem *va; /* P3 diag */
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if (name == NULL) name = "???";
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if ((xres = xres_alloc()) != NULL) {
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tack = xres->xname;
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res = &xres->xres;
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} else {
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if (!printed_full) {
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printk("ioremap: done with statics, switching to malloc\n");
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printed_full = 1;
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}
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tlen = strlen(name);
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tack = kmalloc(sizeof (struct resource) + tlen + 1, GFP_KERNEL);
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if (tack == NULL) return NULL;
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memset(tack, 0, sizeof(struct resource));
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res = (struct resource *) tack;
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tack += sizeof (struct resource);
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}
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strlcpy(tack, name, XNMLN+1);
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res->name = tack;
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va = _sparc_ioremap(res, busno, phys, size);
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/* printk("ioremap(0x%x:%08lx[0x%lx])=%p\n", busno, phys, size, va); */ /* P3 diag */
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return va;
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}
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/*
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*/
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static void __iomem *
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_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz)
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{
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unsigned long offset = ((unsigned long) pa) & (~PAGE_MASK);
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if (allocate_resource(&sparc_iomap, res,
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(offset + sz + PAGE_SIZE-1) & PAGE_MASK,
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sparc_iomap.start, sparc_iomap.end, PAGE_SIZE, NULL, NULL) != 0) {
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/* Usually we cannot see printks in this case. */
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prom_printf("alloc_io_res(%s): cannot occupy\n",
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(res->name != NULL)? res->name: "???");
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prom_halt();
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}
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pa &= PAGE_MASK;
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srmmu_mapiorange(bus, pa, res->start, resource_size(res));
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return (void __iomem *)(unsigned long)(res->start + offset);
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}
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/*
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* Complementary to _sparc_ioremap().
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*/
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static void _sparc_free_io(struct resource *res)
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{
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unsigned long plen;
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plen = resource_size(res);
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BUG_ON((plen & (PAGE_SIZE-1)) != 0);
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srmmu_unmapiorange(res->start, plen);
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release_resource(res);
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}
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unsigned long sparc_dma_alloc_resource(struct device *dev, size_t len)
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{
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struct resource *res;
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res = kzalloc(sizeof(*res), GFP_KERNEL);
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if (!res)
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return 0;
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res->name = dev->of_node->full_name;
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if (allocate_resource(&_sparc_dvma, res, len, _sparc_dvma.start,
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_sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) {
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printk("%s: cannot occupy 0x%zx", __func__, len);
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kfree(res);
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return 0;
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}
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return res->start;
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}
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bool sparc_dma_free_resource(void *cpu_addr, size_t size)
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{
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unsigned long addr = (unsigned long)cpu_addr;
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struct resource *res;
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res = lookup_resource(&_sparc_dvma, addr);
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if (!res) {
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printk("%s: cannot free %p\n", __func__, cpu_addr);
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return false;
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}
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if ((addr & (PAGE_SIZE - 1)) != 0) {
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printk("%s: unaligned va %p\n", __func__, cpu_addr);
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return false;
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}
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size = PAGE_ALIGN(size);
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if (resource_size(res) != size) {
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printk("%s: region 0x%lx asked 0x%zx\n",
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__func__, (long)resource_size(res), size);
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return false;
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}
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release_resource(res);
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kfree(res);
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return true;
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}
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#ifdef CONFIG_SBUS
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void sbus_set_sbus64(struct device *dev, int x)
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{
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printk("sbus_set_sbus64: unsupported\n");
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}
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EXPORT_SYMBOL(sbus_set_sbus64);
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static int __init sparc_register_ioport(void)
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{
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register_proc_sparc_ioport();
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return 0;
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}
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arch_initcall(sparc_register_ioport);
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#endif /* CONFIG_SBUS */
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/* Allocate and map kernel buffer using consistent mode DMA for a device.
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* hwdev should be valid struct pci_dev pointer for PCI devices.
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*/
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void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
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gfp_t gfp, unsigned long attrs)
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{
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unsigned long addr;
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void *va;
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if (!size || size > 256 * 1024) /* __get_free_pages() limit */
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return NULL;
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size = PAGE_ALIGN(size);
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va = (void *) __get_free_pages(gfp | __GFP_ZERO, get_order(size));
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if (!va) {
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printk("%s: no %zd pages\n", __func__, size >> PAGE_SHIFT);
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return NULL;
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}
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addr = sparc_dma_alloc_resource(dev, size);
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if (!addr)
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goto err_nomem;
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srmmu_mapiorange(0, virt_to_phys(va), addr, size);
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*dma_handle = virt_to_phys(va);
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return (void *)addr;
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err_nomem:
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free_pages((unsigned long)va, get_order(size));
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return NULL;
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}
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/* Free and unmap a consistent DMA buffer.
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* cpu_addr is what was returned arch_dma_alloc, size must be the same as what
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* was passed into arch_dma_alloc, and likewise dma_addr must be the same as
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* what *dma_ndler was set to.
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*
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* References to the memory and mappings associated with cpu_addr/dma_addr
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* past this call are illegal.
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*/
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void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
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dma_addr_t dma_addr, unsigned long attrs)
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{
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if (!sparc_dma_free_resource(cpu_addr, PAGE_ALIGN(size)))
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return;
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dma_make_coherent(dma_addr, size);
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srmmu_unmapiorange((unsigned long)cpu_addr, size);
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free_pages((unsigned long)phys_to_virt(dma_addr), get_order(size));
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}
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/* IIep is write-through, not flushing on cpu to device transfer. */
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void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
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size_t size, enum dma_data_direction dir)
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{
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if (dir != PCI_DMA_TODEVICE)
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dma_make_coherent(paddr, PAGE_ALIGN(size));
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}
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const struct dma_map_ops *dma_ops;
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EXPORT_SYMBOL(dma_ops);
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#ifdef CONFIG_PROC_FS
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static int sparc_io_proc_show(struct seq_file *m, void *v)
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{
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struct resource *root = m->private, *r;
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const char *nm;
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for (r = root->child; r != NULL; r = r->sibling) {
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if ((nm = r->name) == NULL) nm = "???";
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seq_printf(m, "%016llx-%016llx: %s\n",
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(unsigned long long)r->start,
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(unsigned long long)r->end, nm);
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}
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return 0;
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}
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#endif /* CONFIG_PROC_FS */
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static void register_proc_sparc_ioport(void)
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{
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#ifdef CONFIG_PROC_FS
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proc_create_single_data("io_map", 0, NULL, sparc_io_proc_show,
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&sparc_iomap);
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proc_create_single_data("dvma_map", 0, NULL, sparc_io_proc_show,
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&_sparc_dvma);
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#endif
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}
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