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From d9deb3700dd28463c329494f76870c6784e50309 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Wed, 20 Feb 2019 08:49:39 +0000
Subject: [PATCH] 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>
---
arch/arm/mach-bcm/board_bcm2835.c | 21 +++++++++++++++------
1 file changed, 15 insertions(+), 6 deletions(-)
--- 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(unsign
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);
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