mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-20 06:08:08 +00:00
20ea6adbf1
Build system: x86_64 Build-tested: bcm2708, bcm2709, bcm2710, bcm2711 Run-tested: bcm2708/RPiB+, bcm2709/RPi3B, bcm2710/RPi3B, bcm2711/RPi4B Signed-off-by: Marty Jones <mj8263788@gmail.com> Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
117 lines
3.7 KiB
Diff
117 lines
3.7 KiB
Diff
From 4f9c11c4e91812d3b779eca65c6d5e2710252771 Mon Sep 17 00:00:00 2001
|
|
From: Phil Elwell <phil@raspberrypi.org>
|
|
Date: Mon, 16 Jul 2018 14:40:13 +0100
|
|
Subject: [PATCH] dwc-otg: FIQ: Fix "bad mode in data abort handler"
|
|
|
|
Create a semi-static mapping for the USB registers early in the boot
|
|
process, before additional kernel threads are started, so all threads
|
|
will have the mappings from the start. This avoids the need for
|
|
data aborts to lazily update them.
|
|
|
|
See: https://github.com/raspberrypi/linux/issues/2450
|
|
|
|
Signed-off-by: Floris Bos <bos@je-eigen-domein.nl>
|
|
---
|
|
arch/arm/mach-bcm/board_bcm2835.c | 69 +++++++++++++++++++++++++++++++
|
|
1 file changed, 69 insertions(+)
|
|
|
|
--- a/arch/arm/mach-bcm/board_bcm2835.c
|
|
+++ b/arch/arm/mach-bcm/board_bcm2835.c
|
|
@@ -6,6 +6,7 @@
|
|
#include <linux/init.h>
|
|
#include <linux/irqchip.h>
|
|
#include <linux/of_address.h>
|
|
+#include <linux/of_fdt.h>
|
|
#include <asm/system_info.h>
|
|
|
|
#include <asm/mach/arch.h>
|
|
@@ -13,6 +14,9 @@
|
|
|
|
#include "platsmp.h"
|
|
|
|
+#define BCM2835_USB_VIRT_BASE 0xf0980000
|
|
+#define BCM2835_USB_VIRT_MPHI 0xf0006000
|
|
+
|
|
static void __init bcm2835_init(void)
|
|
{
|
|
struct device_node *np = of_find_node_by_path("/system");
|
|
@@ -25,6 +29,70 @@ static void __init bcm2835_init(void)
|
|
system_serial_low = val64;
|
|
}
|
|
|
|
+/*
|
|
+ * We need to map registers that are going to be accessed by the FIQ
|
|
+ * very early, before any kernel threads are spawned. Because if done
|
|
+ * later, the mapping tables are not updated instantly but lazily upon
|
|
+ * first access through a data abort handler. While that is fine
|
|
+ * when executing regular kernel code, if the first access in a specific
|
|
+ * thread happens while running FIQ code this will result in a panic.
|
|
+ *
|
|
+ * For more background see the following old mailing list thread:
|
|
+ * https://www.spinics.net/lists/arm-kernel/msg325250.html
|
|
+ */
|
|
+static int __init bcm2835_map_usb(unsigned long node, const char *uname,
|
|
+ int depth, void *data)
|
|
+{
|
|
+ struct map_desc map[2];
|
|
+ const __be32 *reg;
|
|
+ int len;
|
|
+ unsigned long p2b_offset = *((unsigned long *) data);
|
|
+
|
|
+ if (!of_flat_dt_is_compatible(node, "brcm,bcm2708-usb"))
|
|
+ return 0;
|
|
+ reg = of_get_flat_dt_prop(node, "reg", &len);
|
|
+ if (!reg || len != (sizeof(unsigned long) * 4))
|
|
+ return 0;
|
|
+
|
|
+ /* Use information about the physical addresses of the
|
|
+ * registers from the device tree, but use legacy
|
|
+ * iotable_init() static mapping function to map them,
|
|
+ * as ioremap() is not functional at this stage in boot.
|
|
+ */
|
|
+ map[0].virtual = (unsigned long) BCM2835_USB_VIRT_BASE;
|
|
+ map[0].pfn = __phys_to_pfn(be32_to_cpu(reg[0]) - p2b_offset);
|
|
+ map[0].length = be32_to_cpu(reg[1]);
|
|
+ map[0].type = MT_DEVICE;
|
|
+ map[1].virtual = (unsigned long) BCM2835_USB_VIRT_MPHI;
|
|
+ map[1].pfn = __phys_to_pfn(be32_to_cpu(reg[2]) - p2b_offset);
|
|
+ map[1].length = be32_to_cpu(reg[3]);
|
|
+ map[1].type = MT_DEVICE;
|
|
+ iotable_init(map, 2);
|
|
+
|
|
+ return 1;
|
|
+}
|
|
+
|
|
+static void __init bcm2835_map_io(void)
|
|
+{
|
|
+ const __be32 *ranges;
|
|
+ int soc, len;
|
|
+ unsigned long p2b_offset;
|
|
+
|
|
+ debug_ll_io_init();
|
|
+
|
|
+ /* 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");
|
|
+ if (soc < 0)
|
|
+ return;
|
|
+ ranges = of_get_flat_dt_prop(soc, "ranges", &len);
|
|
+ if (!ranges || len < (sizeof(unsigned long) * 3))
|
|
+ return;
|
|
+ p2b_offset = be32_to_cpu(ranges[0]) - be32_to_cpu(ranges[1]);
|
|
+
|
|
+ /* Now search for bcm2708-usb node in device tree */
|
|
+ of_scan_flat_dt(bcm2835_map_usb, &p2b_offset);
|
|
+}
|
|
+
|
|
static const char * const bcm2835_compat[] = {
|
|
#ifdef CONFIG_ARCH_MULTI_V6
|
|
"brcm,bcm2835",
|
|
@@ -37,6 +105,7 @@ static const char * const bcm2835_compat
|
|
};
|
|
|
|
DT_MACHINE_START(BCM2835, "BCM2835")
|
|
+ .map_io = bcm2835_map_io,
|
|
.init_machine = bcm2835_init,
|
|
.dt_compat = bcm2835_compat,
|
|
.smp = smp_ops(bcm2836_smp_ops),
|