patch-2.1.19 linux/arch/sparc64/kernel/ioport.c

• Lines: 134
• Date: Mon Dec 30 11:59:59 1996
• Orig file: v2.1.18/linux/arch/sparc64/kernel/ioport.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.18/linux/arch/sparc64/kernel/ioport.c linux/arch/sparc64/kernel/ioport.c
@@ -0,0 +1,133 @@
+/* $Id: ioport.c,v 1.1 1996/12/28 18:39:39 davem Exp $
+ * ioport.c:  Simple io mapping allocator.
+ *
+ * Copyright (C) 1995,1996 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
+ */
+
+#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 <asm/io.h>
+#include <asm/vaddrs.h>
+#include <asm/oplib.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+
+/* This points to the next to use virtual memory for io mappings */
+static unsigned long dvma_next_free   = DVMA_VADDR;
+unsigned long sparc_iobase_vaddr = IOBASE_VADDR;
+
+/*
+ * sparc_alloc_io:
+ * Map and allocates an obio device.
+ * Implements a simple linear allocator, you can force the function
+ * to use your own mapping, but in practice this should not be used.
+ *
+ * Input:
+ *  address: the obio address to map
+ *  virtual: if non zero, specifies a fixed virtual address where
+ *           the mapping should take place.
+ *  len:     the length of the mapping
+ *  bus_type: The bus on which this io area sits.
+ *
+ * Returns:
+ *  The virtual address where the mapping actually took place.
+ */
+
+void *sparc_alloc_io (void *address, void *virtual, int len, char *name,
+		      int bus_type, int rdonly)
+{
+	unsigned long vaddr, base_address;
+	unsigned long addr = (unsigned long) address;
+	unsigned long offset = (addr & (~PAGE_MASK));
+
+	if (virtual) {
+		vaddr = (unsigned long) virtual;
+
+		len += offset;
+		if(((unsigned long) virtual + len) > (IOBASE_VADDR + IOBASE_LEN)) {
+			prom_printf("alloc_io: Mapping outside IOBASE area\n");
+			prom_halt();
+		}
+		if(check_region ((vaddr | offset), len)) {
+			prom_printf("alloc_io: 0x%lx is already in use\n", vaddr);
+			prom_halt();
+		}
+
+		/* Tell Linux resource manager about the mapping */
+		request_region ((vaddr | offset), len, name);
+	} else {
+		vaddr = occupy_region(sparc_iobase_vaddr, IOBASE_END,
+				(offset + len + PAGE_SIZE-1) & PAGE_MASK, PAGE_SIZE, name);
+		if (vaddr == 0) {
+			/* Usually we cannot see printks in this case. */
+			prom_printf("alloc_io: cannot occupy %d region\n", len);
+			prom_halt();
+		}
+	}
+
+	base_address = vaddr;
+	/* Do the actual mapping */
+	for (; len > 0; len -= PAGE_SIZE) {
+		mapioaddr(addr, vaddr, bus_type, rdonly);
+		vaddr += PAGE_SIZE;
+		addr += PAGE_SIZE;
+	}
+
+	return (void *) (base_address | offset);
+}
+
+void sparc_free_io (void *virtual, int len)
+{
+	unsigned long vaddr = (unsigned long) virtual & PAGE_MASK;
+	unsigned long plen = (((unsigned long)virtual & ~PAGE_MASK) + len + PAGE_SIZE-1) & PAGE_MASK;
+
+	release_region(vaddr, plen);
+
+	for (; plen != 0;) {
+		plen -= PAGE_SIZE;
+		unmapioaddr(vaddr + plen);
+	}
+}
+
+/* Does DVMA allocations with PAGE_SIZE granularity.  How this basically
+ * works is that the ESP chip can do DVMA transfers at ANY address with
+ * certain size and boundary restrictions.  But other devices that are
+ * attached to it and would like to do DVMA have to set things up in
+ * a special way, if the DVMA sees a device attached to it transfer data
+ * at addresses above DVMA_VADDR it will grab them, this way it does not
+ * now have to know the peculiarities of where to read the Lance data
+ * from. (for example)
+ */
+void *sparc_dvma_malloc (int len, char *name)
+{
+	unsigned long vaddr, base_address;
+
+	vaddr = dvma_next_free;
+	if(check_region (vaddr, len)) {
+		prom_printf("alloc_dma: 0x%lx is already in use\n", vaddr);
+		prom_halt();
+	}
+	if(vaddr + len > (DVMA_VADDR + DVMA_LEN)) {
+		prom_printf("alloc_dvma: out of dvma memory\n");
+		prom_halt();
+	}
+
+	/* Basically these can be mapped just like any old
+	 * IO pages, cacheable bit off, etc.  The physical
+	 * pages are now mapped dynamically to save space.
+	 */
+	base_address = vaddr;
+	mmu_map_dma_area(base_address, len);
+	/* Assign the memory area. */
+	dvma_next_free = PAGE_ALIGN(dvma_next_free+len);
+
+	request_region(base_address, len, name);
+
+	return (void *) base_address;
+}