patch-2.4.4 linux/arch/arm/mach-footbridge/mm.c

• Lines: 118
• Date: Thu Apr 12 12:20:31 2001
• Orig file: v2.4.3/linux/arch/arm/mach-footbridge/mm.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.3/linux/arch/arm/mach-footbridge/mm.c linux/arch/arm/mach-footbridge/mm.c
@@ -0,0 +1,117 @@
+/*
+ *  linux/arch/arm/mach-footbridge/mm.c
+ *
+ *  Copyright (C) 1998-2000 Russell King, Dave Gilbert.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  Extra MM routines for the EBSA285 architecture
+ */
+#include <linux/config.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+ 
+#include <asm/pgtable.h>
+#include <asm/page.h>
+#include <asm/io.h>
+#include <asm/hardware/dec21285.h>
+#include <asm/mach-types.h>
+
+#include <asm/mach/map.h>
+
+/*
+ * Common mapping for all systems.  Note that the outbound write flush is
+ * commented out since there is a "No Fix" problem with it.  Not mapping
+ * it means that we have extra bullet protection on our feet.
+ */
+static struct map_desc fb_common_io_desc[] __initdata = {
+ { ARMCSR_BASE,	 DC21285_ARMCSR_BASE,	    ARMCSR_SIZE,  DOMAIN_IO, 0, 1, 0, 0 },
+ { XBUS_BASE,    0x40000000,		    XBUS_SIZE,    DOMAIN_IO, 0, 1, 0, 0 },
+ LAST_DESC
+};
+
+/*
+ * The mapping when the footbridge is in host mode.  We don't map any of
+ * this when we are in add-in mode.
+ */
+static struct map_desc ebsa285_host_io_desc[] __initdata = {
+#if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_FOOTBRIDGE_HOST)
+ { PCIMEM_BASE,  DC21285_PCI_MEM,	    PCIMEM_SIZE,  DOMAIN_IO, 0, 1, 0, 0 },
+ { PCICFG0_BASE, DC21285_PCI_TYPE_0_CONFIG, PCICFG0_SIZE, DOMAIN_IO, 0, 1, 0, 0 },
+ { PCICFG1_BASE, DC21285_PCI_TYPE_1_CONFIG, PCICFG1_SIZE, DOMAIN_IO, 0, 1, 0, 0 },
+ { PCIIACK_BASE, DC21285_PCI_IACK,	    PCIIACK_SIZE, DOMAIN_IO, 0, 1, 0, 0 },
+ { PCIO_BASE,    DC21285_PCI_IO,	    PCIO_SIZE,	  DOMAIN_IO, 0, 1, 0, 0 },
+#endif
+ LAST_DESC
+};
+
+/*
+ * The CO-ebsa285 mapping.
+ */
+static struct map_desc co285_io_desc[] __initdata = {
+#ifdef CONFIG_ARCH_CO285
+ { PCIO_BASE,	 DC21285_PCI_IO,	    PCIO_SIZE,    DOMAIN_IO, 0, 1, 0, 0 },
+ { PCIMEM_BASE,	 DC21285_PCI_MEM,	    PCIMEM_SIZE,  DOMAIN_IO, 0, 1, 0, 0 },
+#endif
+ LAST_DESC
+};
+
+void __init footbridge_map_io(void)
+{
+	struct map_desc *desc = NULL;
+
+	/*
+	 * Set up the common mapping first; we need this to
+	 * determine whether we're in host mode or not.
+	 */
+	iotable_init(fb_common_io_desc);
+
+	/*
+	 * Now, work out what we've got to map in addition on this
+	 * platform.
+	 */
+	if (machine_is_co285())
+		desc = co285_io_desc;
+	else if (footbridge_cfn_mode())
+		desc = ebsa285_host_io_desc;
+
+	if (desc)
+		iotable_init(desc);
+}
+
+#ifdef CONFIG_FOOTBRIDGE_ADDIN
+
+/*
+ * These two functions convert virtual addresses to PCI addresses and PCI
+ * addresses to virtual addresses.  Note that it is only legal to use these
+ * on memory obtained via get_free_page or kmalloc.
+ */
+unsigned long __virt_to_bus(unsigned long res)
+{
+#ifdef CONFIG_DEBUG_ERRORS
+	if (res < PAGE_OFFSET || res >= (unsigned long)high_memory) {
+		printk("__virt_to_bus: invalid virtual address 0x%08lx\n", res);
+		__backtrace();
+	}
+#endif
+	return (res - PAGE_OFFSET) + (*CSR_PCISDRAMBASE & 0xfffffff0);
+}
+
+unsigned long __bus_to_virt(unsigned long res)
+{
+	res -= (*CSR_PCISDRAMBASE & 0xfffffff0);
+	res += PAGE_OFFSET;
+
+#ifdef CONFIG_DEBUG_ERRORS
+	if (res < PAGE_OFFSET || res >= (unsigned long)high_memory) {
+		printk("__bus_to_virt: invalid virtual address 0x%08lx\n", res);
+		__backtrace();
+	}
+#endif
+	return res;
+}
+
+#endif