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76 lines
2.4 KiB
Diff
76 lines
2.4 KiB
Diff
From 09f3510fb70a46c8921f2cf4a90dbcae460a6820 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
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Date: Sat, 29 Oct 2016 13:12:29 +0200
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Subject: [PATCH] ARM: BCM5301X: Add back handler ignoring external imprecise
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aborts
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Since early BCM5301X days we got abort handler that was removed by
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commit 937b12306ea79 ("ARM: BCM5301X: remove workaround imprecise abort
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fault handler"). It assumed we need to deal only with pending aborts
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left by the bootloader. Unfortunately this isn't true for BCM5301X.
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When probing PCI config space (device enumeration) it is expected to
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have master aborts on the PCI bus. Most bridges don't forward (or they
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allow disabling it) these errors onto the AXI/AMBA bus but not the
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Northstar (BCM5301X) one.
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iProc PCIe controller on Northstar seems to be some older one, without
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a control register for errors forwarding. It means we need to workaround
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this at platform level. All newer platforms are not affected by this
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issue.
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
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---
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arch/arm/mach-bcm/bcm_5301x.c | 28 ++++++++++++++++++++++++++++
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1 file changed, 28 insertions(+)
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--- a/arch/arm/mach-bcm/bcm_5301x.c
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+++ b/arch/arm/mach-bcm/bcm_5301x.c
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@@ -9,14 +9,42 @@
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#include <asm/hardware/cache-l2x0.h>
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#include <asm/mach/arch.h>
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+#include <asm/siginfo.h>
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+#include <asm/signal.h>
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+
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+#define FSR_EXTERNAL (1 << 12)
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+#define FSR_READ (0 << 10)
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+#define FSR_IMPRECISE 0x0406
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static const char *const bcm5301x_dt_compat[] __initconst = {
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"brcm,bcm4708",
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NULL,
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};
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+static int bcm5301x_abort_handler(unsigned long addr, unsigned int fsr,
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+ struct pt_regs *regs)
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+{
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+ /*
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+ * We want to ignore aborts forwarded from the PCIe bus that are
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+ * expected and shouldn't really be passed by the PCIe controller.
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+ * The biggest disadvantage is the same FSR code may be reported when
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+ * reading non-existing APB register and we shouldn't ignore that.
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+ */
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+ if (fsr == (FSR_EXTERNAL | FSR_READ | FSR_IMPRECISE))
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+ return 0;
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+
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+ return 1;
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+}
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+
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+static void __init bcm5301x_init_early(void)
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+{
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+ hook_fault_code(16 + 6, bcm5301x_abort_handler, SIGBUS, BUS_OBJERR,
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+ "imprecise external abort");
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+}
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+
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DT_MACHINE_START(BCM5301X, "BCM5301X")
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.l2c_aux_val = 0,
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.l2c_aux_mask = ~0,
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.dt_compat = bcm5301x_dt_compat,
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+ .init_early = bcm5301x_init_early,
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MACHINE_END
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