sh: Use ioremap_fixed() to implement SH-5 ioremap()

Use the fixmap-based memory mapping implementation for SH-5's ioremap()
functions and delete the old static allocator that was borrowed from
sparc.

Signed-off-by: Matt Fleming <matt@console-pimps.org>

1 files changed, 4 insertions, 283 deletions

diff --git a/arch/sh/mm/ioremap_64.c b/arch/sh/mm/ioremap_64.c
index ef434657d428..fb0aa457c71e 100644
--- a/arch/sh/mm/ioremap_64.c
+++ b/arch/sh/mm/ioremap_64.c
@@ -28,299 +28,20 @@
 #include <asm/tlbflush.h>
 #include <asm/mmu.h>
 
-static struct resource shmedia_iomap = {
-        .name   = "shmedia_iomap",
-        .start  = IOBASE_VADDR + PAGE_SIZE,
-        .end    = IOBASE_END - 1,
-};
-
-static void shmedia_mapioaddr(unsigned long pa, unsigned long va,
-                              unsigned long flags);
-static void shmedia_unmapioaddr(unsigned long vaddr);
-static void __iomem *shmedia_ioremap(struct resource *res, u32 pa,
-                                     int sz, unsigned long flags);
-
-/*
- * We have the same problem as the SPARC, so lets have the same comment:
- * 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
-
-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;
-}
-
-static struct resource *shmedia_find_resource(struct resource *root,
-                                              unsigned long vaddr)
-{
-        struct resource *res;
-
-        for (res = root->child; res; res = res->sibling)
-                if (res->start <= vaddr && res->end >= vaddr)
-                        return res;
-
-        return NULL;
-}
-
-static void __iomem *shmedia_alloc_io(unsigned long phys, unsigned long size,
-                                      const char *name, unsigned long flags)
-{
-        struct xresource *xres;
-        struct resource *res;
-        char *tack;
-        int tlen;
-
-        if (name == NULL)
-                name = "???";
-
-        xres = xres_alloc();
-        if (xres != 0) {
-                tack = xres->xname;
-                res = &xres->xres;
-        } else {
-                printk_once(KERN_NOTICE "%s: done with statics, "
-                               "switching to kmalloc\n", __func__);
-                tlen = strlen(name);
-                tack = kmalloc(sizeof(struct resource) + tlen + 1, GFP_KERNEL);
-                if (!tack)
-                        return NULL;
-                memset(tack, 0, sizeof(struct resource));
-                res = (struct resource *) tack;
-                tack += sizeof(struct resource);
-        }
-
-        strncpy(tack, name, XNMLN);
-        tack[XNMLN] = 0;
-        res->name = tack;
-
-        return shmedia_ioremap(res, phys, size, flags);
-}
-
-static void __iomem *shmedia_ioremap(struct resource *res, u32 pa, int sz,
-                                     unsigned long flags)
-{
-        unsigned long offset = ((unsigned long) pa) & (~PAGE_MASK);
-        unsigned long round_sz = (offset + sz + PAGE_SIZE-1) & PAGE_MASK;
-        unsigned long va;
-        unsigned int psz;
-
-        if (allocate_resource(&shmedia_iomap, res, round_sz,
-                              shmedia_iomap.start, shmedia_iomap.end,
-                              PAGE_SIZE, NULL, NULL) != 0) {
-                panic("alloc_io_res(%s): cannot occupy\n",
-                      (res->name != NULL) ? res->name : "???");
-        }
-
-        va = res->start;
-        pa &= PAGE_MASK;
-
-        psz = (res->end - res->start + (PAGE_SIZE - 1)) / PAGE_SIZE;
-
-        for (psz = res->end - res->start + 1; psz != 0; psz -= PAGE_SIZE) {
-                shmedia_mapioaddr(pa, va, flags);
-                va += PAGE_SIZE;
-                pa += PAGE_SIZE;
-        }
-
-        return (void __iomem *)(unsigned long)(res->start + offset);
-}
-
-static void shmedia_free_io(struct resource *res)
-{
-        unsigned long len = res->end - res->start + 1;
-
-        BUG_ON((len & (PAGE_SIZE - 1)) != 0);
-
-        while (len) {
-                len -= PAGE_SIZE;
-                shmedia_unmapioaddr(res->start + len);
-        }
-
-        release_resource(res);
-}
-
-static __init_refok void *sh64_get_page(void)
-{
-        void *page;
-
-        if (slab_is_available())
-                page = (void *)get_zeroed_page(GFP_KERNEL);
-        else
-                page = alloc_bootmem_pages(PAGE_SIZE);
-
-        if (!page || ((unsigned long)page & ~PAGE_MASK))
-                panic("sh64_get_page: Out of memory already?\n");
-
-        return page;
-}
-
-static void shmedia_mapioaddr(unsigned long pa, unsigned long va,
-                              unsigned long flags)
+void __iomem *__ioremap_caller(unsigned long offset, unsigned long size,
+                               unsigned long flags, void *caller)
 {
-        pgd_t *pgdp;
-        pud_t *pudp;
-        pmd_t *pmdp;
-        pte_t *ptep, pte;
         pgprot_t prot;
 
-        pr_debug("shmedia_mapiopage pa %08lx va %08lx\n",  pa, va);
-
-        if (!flags)
-                flags = 1; /* 1 = CB0-1 device */
-
-        pgdp = pgd_offset_k(va);
-        if (pgd_none(*pgdp) || !pgd_present(*pgdp)) {
-                pudp = (pud_t *)sh64_get_page();
-                set_pgd(pgdp, __pgd((unsigned long)pudp | _KERNPG_TABLE));
-        }
-
-        pudp = pud_offset(pgdp, va);
-        if (pud_none(*pudp) || !pud_present(*pudp)) {
-                pmdp = (pmd_t *)sh64_get_page();
-                set_pud(pudp, __pud((unsigned long)pmdp | _KERNPG_TABLE));
-        }
-
-        pmdp = pmd_offset(pudp, va);
-        if (pmd_none(*pmdp) || !pmd_present(*pmdp)) {
-                ptep = (pte_t *)sh64_get_page();
-                set_pmd(pmdp, __pmd((unsigned long)ptep + _PAGE_TABLE));
-        }
-
         prot = __pgprot(_PAGE_PRESENT | _PAGE_READ     | _PAGE_WRITE  |
                         _PAGE_DIRTY   | _PAGE_ACCESSED | _PAGE_SHARED | flags);
 
-        pte = pfn_pte(pa >> PAGE_SHIFT, prot);
-        ptep = pte_offset_kernel(pmdp, va);
-
-        if (!pte_none(*ptep) &&
-            pte_val(*ptep) != pte_val(pte))
-                pte_ERROR(*ptep);
-
-        set_pte(ptep, pte);
-
-        flush_tlb_kernel_range(va, PAGE_SIZE);
-}
-
-static void shmedia_unmapioaddr(unsigned long vaddr)
-{
-        pgd_t *pgdp;
-        pud_t *pudp;
-        pmd_t *pmdp;
-        pte_t *ptep;
-
-        pgdp = pgd_offset_k(vaddr);
-        if (pgd_none(*pgdp) || pgd_bad(*pgdp))
-                return;
-
-        pudp = pud_offset(pgdp, vaddr);
-        if (pud_none(*pudp) || pud_bad(*pudp))
-                return;
-
-        pmdp = pmd_offset(pudp, vaddr);
-        if (pmd_none(*pmdp) || pmd_bad(*pmdp))
-                return;
-
-        ptep = pte_offset_kernel(pmdp, vaddr);
-
-        if (pte_none(*ptep) || !pte_present(*ptep))
-                return;
-
-        clear_page((void *)ptep);
-        pte_clear(&init_mm, vaddr, ptep);
-}
-
-void __iomem *__ioremap_caller(unsigned long offset, unsigned long size,
-                               unsigned long flags, void *caller)
-{
-        char name[14];
-
-        sprintf(name, "phys_%08x", (u32)offset);
-        return shmedia_alloc_io(offset, size, name, flags);
+        return ioremap_fixed(offset, size, prot);
 }
 EXPORT_SYMBOL(__ioremap_caller);
 
 void __iounmap(void __iomem *virtual)
 {
-        unsigned long vaddr = (unsigned long)virtual & PAGE_MASK;
-        struct resource *res;
-        unsigned int psz;
-
-        res = shmedia_find_resource(&shmedia_iomap, vaddr);
-        if (!res) {
-                printk(KERN_ERR "%s: Failed to free 0x%08lx\n",
-                       __func__, vaddr);
-                return;
-        }
-
-        psz = (res->end - res->start + (PAGE_SIZE - 1)) / PAGE_SIZE;
-
-        shmedia_free_io(res);
-
-        if ((char *)res >= (char *)xresv &&
-            (char *)res <  (char *)&xresv[XNRES]) {
-                xres_free((struct xresource *)res);
-        } else {
-                kfree(res);
-        }
+        iounmap_fixed(virtual);
 }
 EXPORT_SYMBOL(__iounmap);
-
-static int
-ioremap_proc_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;
-                nm = r->name;
-                if (nm == NULL)
-                        nm = "???";
-
-                p += sprintf(p, "%08lx-%08lx: %s\n",
-                             (unsigned long)r->start,
-                             (unsigned long)r->end, nm);
-        }
-
-        return p-buf;
-}
-
-static int __init register_proc_onchip(void)
-{
-        create_proc_read_entry("io_map", 0, 0, ioremap_proc_info,
-                               &shmedia_iomap);
-        return 0;
-}
-late_initcall(register_proc_onchip);