linux-kernel - [PATCH v2 2/4] 44x/fsp2: interrupt handling setup

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Message-Id: <20171201155827.57979-2-ivan@de.ibm.com>
Date:   Fri, 1 Dec 2017 18:58:25 +0300
From:   Ivan Mikhaylov <ivan@...ibm.com>
To:     Alistair Popple <alistair@...ple.id.au>,
        Matt Porter <mporter@...nel.crashing.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Joel Stanley <joel@....id.au>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH v2 2/4] 44x/fsp2: interrupt handling setup

* clear out any possible plb6 errors
* board interrupt handling setup within l2 reg set
* fsp2 parity error setup

All those points are needed for correct interrupt
handling on board level including error handling report.

Reviewed-by: Alistair Popple <alistair@...ple.id.au>
Signed-off-by: Ivan Mikhaylov <ivan@...ibm.com>
---
 arch/powerpc/platforms/44x/fsp2.c |   37 +++++++++++++++++++++++++++++++++++++
 1 files changed, 37 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/platforms/44x/fsp2.c b/arch/powerpc/platforms/44x/fsp2.c
index 92e9804..baed409 100644
--- a/arch/powerpc/platforms/44x/fsp2.c
+++ b/arch/powerpc/platforms/44x/fsp2.c
@@ -27,6 +27,8 @@
 #include <asm/time.h>
 #include <asm/uic.h>
 #include <asm/ppc4xx.h>
+#include <asm/dcr.h>
+#include "fsp2.h"
 
 static __initdata struct of_device_id fsp2_of_bus[] = {
 	{ .compatible = "ibm,plb4", },
@@ -44,10 +46,45 @@ static int __init fsp2_device_probe(void)
 
 static int __init fsp2_probe(void)
 {
+	u32 val;
 	unsigned long root = of_get_flat_dt_root();
 
 	if (!of_flat_dt_is_compatible(root, "ibm,fsp2"))
 		return 0;
+
+	/* Clear BC_ERR and mask snoopable request plb errors. */
+	val = mfdcr(DCRN_PLB6_CR0);
+	val |= 0x20000000;
+	mtdcr(DCRN_PLB6_BASE, val);
+	mtdcr(DCRN_PLB6_HD, 0xffff0000);
+	mtdcr(DCRN_PLB6_SHD, 0xffff0000);
+
+	/* L2 machine checks */
+	mtl2(L2PLBMCKEN0, 0xffffffff);
+	mtl2(L2PLBMCKEN1, 0x0000ffff);
+	mtl2(L2ARRMCKEN0, 0xffffffff);
+	mtl2(L2ARRMCKEN1, 0xffffffff);
+	mtl2(L2ARRMCKEN2, 0xfffff000);
+	mtl2(L2CPUMCKEN,  0xffffffff);
+	mtl2(L2RACMCKEN0, 0xffffffff);
+	mtl2(L2WACMCKEN0, 0xffffffff);
+	mtl2(L2WACMCKEN1, 0xffffffff);
+	mtl2(L2WACMCKEN2, 0xffffffff);
+	mtl2(L2WDFMCKEN,  0xffffffff);
+
+	/* L2 interrupts */
+	mtl2(L2PLBINTEN1, 0xffff0000);
+
+	/*
+	 * At a global level, enable all L2 machine checks and interrupts
+	 * reported by the L2 subsystems, except for the external machine check
+	 * input (UIC0.1).
+	 */
+	mtl2(L2MCKEN, 0x000007ff);
+	mtl2(L2INTEN, 0x000004ff);
+
+	/* Enable FSP-2 configuration logic parity errors */
+	mtdcr(DCRN_CONF_EIR_RS, 0x80000000);
 	return 1;
 }
 
-- 
1.7.1