patch-2.4.22 linux-2.4.22/arch/sh64/mm/ioremap.c

• Lines: 441
• Date: 2003-08-25 04:44:40.000000000 -0700
• Orig file: linux-2.4.21/arch/sh64/mm/ioremap.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/arch/sh64/mm/ioremap.c linux-2.4.22/arch/sh64/mm/ioremap.c
@@ -0,0 +1,440 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * arch/sh64/mm/ioremap.c
+ *
+ * Copyright (C) 2000, 2001  Paolo Alberelli
+ * Copyright (C) 2003  Paul Mundt
+ *
+ * Mostly derived from arch/sh/mm/ioremap.c which, in turn is mostly
+ * derived from arch/i386/mm/ioremap.c .
+ *
+ *   (C) Copyright 1995 1996 Linus Torvalds
+ */
+
+#include <linux/vmalloc.h>
+#include <asm/io.h>
+#include <asm/pgalloc.h>
+#include <linux/ioport.h>
+#include <linux/bootmem.h>
+#include <linux/proc_fs.h>
+
+/*
+** change to:
+** #define DEBUG_IOREMAP(args)	printk(args)
+** to turn on ioremap trace.
+*/
+#define DEBUG_IOREMAP(args)
+
+static inline void remap_area_pte(pte_t * pte, unsigned long address, unsigned long size,
+	unsigned long phys_addr, unsigned long flags)
+{
+	unsigned long end;
+
+	address &= ~PMD_MASK;
+	end = address + size;
+	if (end > PMD_SIZE)
+		end = PMD_SIZE;
+
+	DEBUG_IOREMAP(("    %s: pte %x address %x size %x phys_addr %x\n", \
+			__FUNCTION__,pte,address,size,phys_addr));
+
+	do {
+		if (!pte_none(*pte))
+			printk("remap_area_pte: page already exists\n");
+		set_pte(pte, mk_pte_phys(phys_addr, __pgprot(_PAGE_PRESENT |
+					_PAGE_READ | _PAGE_WRITE | 
+					_PAGE_DIRTY | _PAGE_ACCESSED |_PAGE_SHARED | flags)));
+		address += PAGE_SIZE;
+		phys_addr += PAGE_SIZE;
+		pte++;
+	} while (address && (address < end));
+}
+
+static inline int remap_area_pmd(pmd_t * pmd, unsigned long address, unsigned long size,
+	unsigned long phys_addr, unsigned long flags)
+{
+	unsigned long end;
+
+	address &= ~PGDIR_MASK;
+	end = address + size;
+
+	if (end > PGDIR_SIZE)
+		end = PGDIR_SIZE;
+
+        DEBUG_IOREMAP(("%s: pmd 0x%08x, addr. 0x%08x, phys. 0x%08x, end 0x%08x pmd 0x%08x\n", \
+	       pmd, address, phys_addr, end));
+
+	phys_addr -= address;
+	do {	 
+
+        DEBUG_IOREMAP(("%s: pmd 0x%08x, addr. 0x%08x, phys. 0x%08x, end 0x%08x pmd 0x%08x\n", \
+	               __FUNCTION__, pmd, address, phys_addr, end));
+
+		pte_t * pte = pte_alloc(&init_mm, pmd, address);
+		if (!pte) {
+			return -ENOMEM;
+		}
+		remap_area_pte(pte, address, end - address, address + phys_addr, flags);
+		
+		address = (address + PMD_SIZE) & PMD_MASK;
+		pmd++;
+
+    		DEBUG_IOREMAP(("remap_area_pmd address is 0x%08x phys_addr is 0x%08x end 0x%08x\n", address,phys_addr,end));
+
+
+	} while (address && (address < end));
+	return 0;
+}
+
+static int remap_area_pages(unsigned long address, unsigned long phys_addr,
+				 unsigned long size, unsigned long flags)
+{
+	int error;
+	pgd_t * dir;
+	unsigned long end = address + size;
+
+	phys_addr -= address;
+	dir = pgd_offset(&init_mm, address);
+	flush_cache_all();
+	spin_lock(&init_mm.page_table_lock);    
+	do {
+
+		pmd_t *pmd = pmd_alloc(&init_mm,dir, address);
+		error = -ENOMEM;
+		if (!pmd)
+			break;
+		if (remap_area_pmd(pmd, address, end - address,
+				   phys_addr + address, flags)) {
+			 break;
+		}
+		error=0;
+		address = (address + PGDIR_SIZE) & PGDIR_MASK;
+		dir++;
+	} while (address && (address < end));
+	spin_unlock(&init_mm.page_table_lock);   
+	flush_tlb_all();
+	return 0;
+}
+
+/*
+ * Generic mapping function (not visible outside):
+ */
+
+/*
+ * Remap an arbitrary physical address space into the kernel virtual
+ * address space. Needed when the kernel wants to access high addresses
+ * directly.
+ *
+ * NOTE! We need to allow non-page-aligned mappings too: we will obviously
+ * have to convert them into an offset in a page-aligned mapping, but the
+ * caller shouldn't need to know that small detail.
+ */
+void * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags)
+{
+	void * addr;
+	struct vm_struct * area;
+	unsigned long offset, last_addr;
+
+	/* Don't allow wraparound or zero size */
+	last_addr = phys_addr + size - 1;
+	if (!size || last_addr < phys_addr)
+		return NULL;
+
+	/*
+	 * Mappings have to be page-aligned
+	 */
+	offset = phys_addr & ~PAGE_MASK;
+	phys_addr &= PAGE_MASK;
+	size = PAGE_ALIGN(last_addr) - phys_addr;
+
+	/*
+	 * Ok, go for it..
+	 */
+	area = get_vm_area(size, VM_IOREMAP);
+	DEBUG_IOREMAP(("Get vm_area returns 0x%08x addr 0x%08x \n", \
+		      area, area->addr));
+
+	if (!area)
+		return NULL;
+	addr = area->addr;
+	if (remap_area_pages(VMALLOC_VMADDR(addr), phys_addr, size, flags)) {
+		vfree(addr);
+		return NULL;
+	}
+	return (void *) (offset + (char *)addr);
+}
+
+void iounmap(void *addr)
+{
+	if (((long) addr >= VMALLOC_START) && ((long) addr <= VMALLOC_END))
+		return vfree((void *) (PAGE_MASK & (unsigned long) addr));
+}
+
+static struct resource shmedia_iomap = {
+        .name	= "shmedia_iomap",
+	.start	= IOBASE_VADDR,
+	.end	= IOBASE_END - 1,
+};
+
+static void shmedia_mapioaddr(unsigned long pa, unsigned long va);
+static void shmedia_unmapioaddr(unsigned long vaddr);
+static unsigned long shmedia_ioremap(struct resource *res, u32 pa, int sz);
+
+/*
+ * 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 unsigned long shmedia_alloc_io(unsigned long phys, unsigned long size,
+				      const char *name)
+{
+        static int printed_full = 0;
+        struct xresource *xres;
+        struct resource *res;
+        char *tack;
+        int tlen;
+
+        if (name == NULL) name = "???";
+
+        if ((xres = xres_alloc()) != 0) {
+                tack = xres->xname;
+                res = &xres->xres;
+        } else {
+                if (!printed_full) {
+                        printk("%s: done with statics, switching to kmalloc\n",
+			       __FUNCTION__);
+                        printed_full = 1;
+                }
+                tlen = strlen(name);
+                tack = kmalloc(sizeof (struct resource) + tlen + 1, GFP_KERNEL);
+                if (!tack)
+			return -ENOMEM;
+                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);
+}
+
+static unsigned long shmedia_ioremap(struct resource *res, u32 pa, int sz)
+{
+        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;
+
+	/* log at boot time ... */
+	printk("mapioaddr: %6s  [%2ld page%s]  va 0x%08lx   pa 0x%08x\n",
+	       ((res->name != NULL) ? res->name : "???"),
+	       psz, psz == 1 ? " " : "s", va, pa);
+
+        for (psz = res->end - res->start + 1; psz != 0; psz -= PAGE_SIZE) {
+                shmedia_mapioaddr(pa, va);
+                va += PAGE_SIZE;
+                pa += PAGE_SIZE;
+        }
+
+        res->start += offset;
+        res->end = res->start + sz - 1;         /* not strictly necessary.. */
+
+        return res->start;
+}
+
+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 void shmedia_mapioaddr(unsigned long pa, unsigned long va)
+{
+	pgd_t *pgdp;
+	pmd_t *pmdp;
+	pte_t *ptep;
+
+	unsigned long flags = 1; /* 1 = CB0-1 device */
+
+
+	DEBUG_IOREMAP(("shmedia_mapiopage pa %08x va %08x\n",  pa, va));
+
+	pgdp = pgd_offset_k(va);
+	if (pgd_none(*pgdp)) {
+		pmdp = alloc_bootmem_low_pages(PTRS_PER_PMD * sizeof(pmd_t));
+		if (pmdp == NULL) panic("No memory for pmd\n");
+		memset(pmdp, 0, PTRS_PER_PGD * sizeof(pmd_t));
+		set_pgd(pgdp, __pgd((unsigned long)pmdp | _KERNPG_TABLE));
+	}
+
+	pmdp = pmd_offset(pgdp, va);
+	if (pmd_none(*pmdp)) {
+		ptep = alloc_bootmem_low_pages(PTRS_PER_PTE * sizeof(pte_t));
+		if (ptep == NULL) panic("No memory for pte\n");
+		clear_page((void *)ptep);
+		set_pmd(pmdp, __pmd((unsigned long)ptep + _PAGE_TABLE));
+	}
+
+	ptep = pte_offset(pmdp, va);
+	set_pte(ptep, mk_pte_phys(pa, __pgprot(_PAGE_PRESENT |
+			_PAGE_READ | _PAGE_WRITE | 
+			_PAGE_DIRTY | _PAGE_ACCESSED |_PAGE_SHARED | flags)));
+}
+
+static void shmedia_unmapioaddr(unsigned long vaddr)
+{
+	pgd_t *pgdp;
+	pmd_t *pmdp;
+	pte_t *ptep;
+
+	pgdp = pgd_offset_k(vaddr);
+	pmdp = pmd_offset(pgdp, vaddr);
+
+	if (pmd_none(*pmdp) || pmd_bad(*pmdp))
+		return;
+
+	ptep = pte_offset(pmdp, vaddr);
+
+	if (pte_none(*ptep) || !pte_present(*ptep))
+		return;
+
+	clear_page((void *)ptep);
+	pte_clear(ptep);
+}
+
+unsigned long onchip_remap(unsigned long phys, unsigned long size, const char *name)
+{
+	if (size < PAGE_SIZE)
+		size = PAGE_SIZE;
+
+	return shmedia_alloc_io(phys, size, name);
+}
+
+void onchip_unmap(unsigned long vaddr)
+{
+	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",
+		       __FUNCTION__, vaddr);
+		return;
+	}
+
+        psz = (res->end - res->start + (PAGE_SIZE - 1)) / PAGE_SIZE;
+
+        printk(KERN_DEBUG "unmapioaddr: %6s  [%2ld page%s] freed\n",
+	       res->name, psz, psz == 1 ? " " : "s");
+
+	shmedia_free_io(res);
+
+	if ((char *)res >= (char *)xresv &&
+	    (char *)res <  (char *)&xresv[XNRES]) {
+		xres_free((struct xresource *)res);
+	} else {
+		kfree(res);
+	}
+}
+
+#ifdef CONFIG_PROC_FS
+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;
+		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 */
+
+static int __init register_proc_onchip(void)
+{
+#ifdef CONFIG_PROC_FS
+	create_proc_read_entry("io_map",0,0, ioremap_proc_info, &shmedia_iomap);
+#endif
+	return 0;
+}
+
+__initcall(register_proc_onchip);