0fb849b9d7
Presently this is special-cased for early initialization. While there are situations where these static early initializations are still necessary, with minor changes it is possible to use this for the regular ioremap implementation as well. This allows us to kill off the special-casing for the remap completely and to start tidying up all of the SH-5 special-casing in drivers. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
330 lines
7.4 KiB
C
330 lines
7.4 KiB
C
/*
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* arch/sh/mm/ioremap_64.c
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*
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* Copyright (C) 2000, 2001 Paolo Alberelli
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* Copyright (C) 2003 - 2007 Paul Mundt
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*
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* Mostly derived from arch/sh/mm/ioremap.c which, in turn is mostly
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* derived from arch/i386/mm/ioremap.c .
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*
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* (C) Copyright 1995 1996 Linus Torvalds
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/vmalloc.h>
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#include <linux/ioport.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/io.h>
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#include <linux/bootmem.h>
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#include <linux/proc_fs.h>
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#include <asm/page.h>
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#include <asm/pgalloc.h>
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#include <asm/addrspace.h>
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#include <asm/mmu.h>
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static struct resource shmedia_iomap = {
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.name = "shmedia_iomap",
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.start = IOBASE_VADDR + PAGE_SIZE,
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.end = IOBASE_END - 1,
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};
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static void shmedia_mapioaddr(unsigned long pa, unsigned long va,
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unsigned long flags);
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static void shmedia_unmapioaddr(unsigned long vaddr);
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static void __iomem *shmedia_ioremap(struct resource *res, u32 pa,
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int sz, unsigned long flags);
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/*
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* We have the same problem as the SPARC, so lets have the same comment:
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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
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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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{
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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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{
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xrp->xflag = 0;
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}
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static struct resource *shmedia_find_resource(struct resource *root,
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unsigned long vaddr)
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{
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struct resource *res;
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for (res = root->child; res; res = res->sibling)
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if (res->start <= vaddr && res->end >= vaddr)
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return res;
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return NULL;
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}
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static void __iomem *shmedia_alloc_io(unsigned long phys, unsigned long size,
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const char *name, unsigned long flags)
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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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if (name == NULL)
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name = "???";
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xres = xres_alloc();
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if (xres != 0) {
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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(KERN_NOTICE "%s: done with statics, "
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"switching to kmalloc\n", __func__);
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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)
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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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strncpy(tack, name, XNMLN);
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tack[XNMLN] = 0;
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res->name = tack;
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return shmedia_ioremap(res, phys, size, flags);
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}
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static void __iomem *shmedia_ioremap(struct resource *res, u32 pa, int sz,
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unsigned long flags)
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{
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unsigned long offset = ((unsigned long) pa) & (~PAGE_MASK);
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unsigned long round_sz = (offset + sz + PAGE_SIZE-1) & PAGE_MASK;
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unsigned long va;
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unsigned int psz;
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if (allocate_resource(&shmedia_iomap, res, round_sz,
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shmedia_iomap.start, shmedia_iomap.end,
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PAGE_SIZE, NULL, NULL) != 0) {
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panic("alloc_io_res(%s): cannot occupy\n",
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(res->name != NULL) ? res->name : "???");
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}
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va = res->start;
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pa &= PAGE_MASK;
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psz = (res->end - res->start + (PAGE_SIZE - 1)) / PAGE_SIZE;
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for (psz = res->end - res->start + 1; psz != 0; psz -= PAGE_SIZE) {
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shmedia_mapioaddr(pa, va, flags);
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va += PAGE_SIZE;
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pa += PAGE_SIZE;
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}
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return (void __iomem *)(unsigned long)(res->start + offset);
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}
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static void shmedia_free_io(struct resource *res)
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{
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unsigned long len = res->end - res->start + 1;
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BUG_ON((len & (PAGE_SIZE - 1)) != 0);
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while (len) {
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len -= PAGE_SIZE;
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shmedia_unmapioaddr(res->start + len);
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}
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release_resource(res);
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}
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static __init_refok void *sh64_get_page(void)
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{
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void *page;
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if (after_bootmem)
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page = (void *)get_zeroed_page(GFP_KERNEL);
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else
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page = alloc_bootmem_pages(PAGE_SIZE);
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if (!page || ((unsigned long)page & ~PAGE_MASK))
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panic("sh64_get_page: Out of memory already?\n");
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return page;
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}
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static void shmedia_mapioaddr(unsigned long pa, unsigned long va,
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unsigned long flags)
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{
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pgd_t *pgdp;
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pud_t *pudp;
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pmd_t *pmdp;
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pte_t *ptep, pte;
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pgprot_t prot;
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pr_debug("shmedia_mapiopage pa %08lx va %08lx\n", pa, va);
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if (!flags)
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flags = 1; /* 1 = CB0-1 device */
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pgdp = pgd_offset_k(va);
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if (pgd_none(*pgdp) || !pgd_present(*pgdp)) {
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pudp = (pud_t *)sh64_get_page();
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set_pgd(pgdp, __pgd((unsigned long)pudp | _KERNPG_TABLE));
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}
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pudp = pud_offset(pgdp, va);
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if (pud_none(*pudp) || !pud_present(*pudp)) {
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pmdp = (pmd_t *)sh64_get_page();
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set_pud(pudp, __pud((unsigned long)pmdp | _KERNPG_TABLE));
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}
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pmdp = pmd_offset(pudp, va);
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if (pmd_none(*pmdp) || !pmd_present(*pmdp)) {
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ptep = (pte_t *)sh64_get_page();
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set_pmd(pmdp, __pmd((unsigned long)ptep + _PAGE_TABLE));
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}
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prot = __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE |
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_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_SHARED | flags);
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pte = pfn_pte(pa >> PAGE_SHIFT, prot);
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ptep = pte_offset_kernel(pmdp, va);
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if (!pte_none(*ptep) &&
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pte_val(*ptep) != pte_val(pte))
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pte_ERROR(*ptep);
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set_pte(ptep, pte);
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flush_tlb_kernel_range(va, PAGE_SIZE);
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}
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static void shmedia_unmapioaddr(unsigned long vaddr)
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{
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pgd_t *pgdp;
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pud_t *pudp;
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pmd_t *pmdp;
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pte_t *ptep;
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pgdp = pgd_offset_k(vaddr);
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if (pgd_none(*pgdp) || pgd_bad(*pgdp))
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return;
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pudp = pud_offset(pgdp, vaddr);
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if (pud_none(*pudp) || pud_bad(*pudp))
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return;
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pmdp = pmd_offset(pudp, vaddr);
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if (pmd_none(*pmdp) || pmd_bad(*pmdp))
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return;
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ptep = pte_offset_kernel(pmdp, vaddr);
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if (pte_none(*ptep) || !pte_present(*ptep))
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return;
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clear_page((void *)ptep);
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pte_clear(&init_mm, vaddr, ptep);
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}
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void __iomem *__ioremap(unsigned long offset, unsigned long size,
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unsigned long flags)
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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 shmedia_alloc_io(offset, size, name, flags);
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}
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EXPORT_SYMBOL(__ioremap);
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void __iounmap(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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unsigned int psz;
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res = shmedia_find_resource(&shmedia_iomap, vaddr);
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if (!res) {
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printk(KERN_ERR "%s: Failed to free 0x%08lx\n",
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__func__, vaddr);
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return;
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}
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psz = (res->end - res->start + (PAGE_SIZE - 1)) / PAGE_SIZE;
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shmedia_free_io(res);
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if ((char *)res >= (char *)xresv &&
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(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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static int
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ioremap_proc_info(char *buf, char **start, off_t fpos, int length, int *eof,
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void *data)
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{
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char *p = buf, *e = buf + length;
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struct resource *r;
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const char *nm;
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for (r = ((struct resource *)data)->child; r != NULL; r = r->sibling) {
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if (p + 32 >= e) /* Better than nothing */
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break;
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nm = r->name;
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if (nm == NULL)
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nm = "???";
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p += sprintf(p, "%08lx-%08lx: %s\n",
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(unsigned long)r->start,
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(unsigned long)r->end, nm);
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}
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return p-buf;
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}
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static int __init register_proc_onchip(void)
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{
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create_proc_read_entry("io_map", 0, 0, ioremap_proc_info,
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&shmedia_iomap);
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return 0;
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}
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late_initcall(register_proc_onchip);
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