diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0091-dwc-otg-FIQ-Fix-bad-mode-in-data-abort-handler.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0091-dwc-otg-FIQ-Fix-bad-mode-in-data-abort-handler.patch | 116 |
1 files changed, 0 insertions, 116 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0091-dwc-otg-FIQ-Fix-bad-mode-in-data-abort-handler.patch b/target/linux/bcm27xx/patches-5.4/950-0091-dwc-otg-FIQ-Fix-bad-mode-in-data-abort-handler.patch deleted file mode 100644 index 63507833b4..0000000000 --- a/target/linux/bcm27xx/patches-5.4/950-0091-dwc-otg-FIQ-Fix-bad-mode-in-data-abort-handler.patch +++ /dev/null @@ -1,116 +0,0 @@ -From 92fdfb919ab0efdcd7d177ff85272e80bf0f844e 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), |