arm: bcm2835: Fix FIQ early ioremap

The ioremapping creates mappings within the vmalloc area. The
equivalent early function, create_mapping, now checks that the
requested explicit virtual address is between VMALLOC_START and
VMALLOC_END. As there is no reason to have any correlation between
the physical and virtual addresses, put the required mappings at
VMALLOC_START and above.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>

diff --git a/arch/arm/mach-bcm/board_bcm2835.c b/arch/arm/mach-bcm/board_bcm2835.c
index 9b6c921..9bd9842 100644 (file)
--- a/arch/arm/mach-bcm/board_bcm2835.c
+++ b/arch/arm/mach-bcm/board_bcm2835.c
@@ -5,17 +5,20 @@
 
 #include <linux/init.h>
 #include <linux/irqchip.h>
+#include <linux/mm.h>
 #include <linux/of_address.h>
 #include <linux/of_fdt.h>
 #include <asm/system_info.h>
 
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
+#include <asm/memory.h>
+#include <asm/pgtable.h>
 
 #include "platsmp.h"
 
-#define BCM2835_USB_VIRT_BASE   0xf0980000
-#define BCM2835_USB_VIRT_MPHI   0xf0006000
+#define BCM2835_USB_VIRT_BASE   (VMALLOC_START)
+#define BCM2835_USB_VIRT_MPHI   (VMALLOC_START + 0x10000)
 
 static void __init bcm2835_init(void)
 {
@@ -74,20 +77,26 @@ static int __init bcm2835_map_usb(unsigned long node, const char *uname,
 
 static void __init bcm2835_map_io(void)
 {
-       const __be32 *ranges;
+       const __be32 *ranges, *address_cells;
+       unsigned long root, addr_cells;
        int soc, len;
        unsigned long p2b_offset;
 
        debug_ll_io_init();
 
+       root = of_get_flat_dt_root();
        /* Find out how to map bus to physical address first from soc/ranges */
-       soc = of_get_flat_dt_subnode_by_name(of_get_flat_dt_root(), "soc");
+       soc = of_get_flat_dt_subnode_by_name(root, "soc");
        if (soc < 0)
                return;
+       address_cells = of_get_flat_dt_prop(root, "#address-cells", &len);
+       if (!address_cells || len < (sizeof(unsigned long)))
+               return;
+       addr_cells = be32_to_cpu(address_cells[0]);
        ranges = of_get_flat_dt_prop(soc, "ranges", &len);
-       if (!ranges || len < (sizeof(unsigned long) * 3))
+       if (!ranges || len < (sizeof(unsigned long) * (2 + addr_cells)))
                return;
-       p2b_offset = be32_to_cpu(ranges[0]) - be32_to_cpu(ranges[1]);
+       p2b_offset = be32_to_cpu(ranges[0]) - be32_to_cpu(ranges[addr_cells]);
 
        /* Now search for bcm2708-usb node in device tree */
        of_scan_flat_dt(bcm2835_map_usb, &p2b_offset);