[PATCH 3/4 v2] fsl_pci: Add a workaround for PCI 6 errata

[Zhao Chenhui]

From: chenhui zhao <chenhui.zhao at freescale.com>

Issue:
The register bits ERR_DR[OWMSV] and ERR_DR[ORMSV] can erroneously set and
may trigger an interrupt if capturing and reporting of these events are enabled.

Workaround:
Disable OWMSV, ORMSV error capture and disable OWMSV, ORMSV error reporting.
Do not affect the functionality of the controller when the checking is disabled.

This errata exists in MPC8543, MPC8543E, MPC8545, MPC8545E, MPC8547, MPC8547E,
MPC8548 and MPC8548E. Refer to PCI 6 in MPC8548 errata document.

Signed-off-by: Zhao Chenhui <chenhui.zhao at freescale.com>
Signed-off-by: Li Yang <leoli at freescale.com>
---
Changes for v2:
 * add 8543, 8545 and 8547

 arch/powerpc/sysdev/fsl_pci.c |   19 ++++++++++++++
 arch/powerpc/sysdev/fsl_pci.h |   53 ++++++++++++++++++++++++++++++++++-------
 2 files changed, 63 insertions(+), 9 deletions(-)

diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
index f595117..e925c1b 100644
--- a/arch/powerpc/sysdev/fsl_pci.c
+++ b/arch/powerpc/sysdev/fsl_pci.c
@@ -156,6 +156,25 @@ static void __init setup_pci_atmu(struct pci_controller *hose,
 	    return;
 	}
 
+	/*
+	 * PCI/PCI-X erroneous error detection
+	 * Fix erratum PCI 6 on MPC8548
+	 */
+#define OWMSV 0x10
+#define ORMSV 0x08
+	if ((fsl_svr_is(SVR_8543) || fsl_svr_is(SVR_8543_E) ||
+	     fsl_svr_is(SVR_8545) || fsl_svr_is(SVR_8545_E) ||
+	     fsl_svr_is(SVR_8547) || fsl_svr_is(SVR_8547_E) ||
+	     fsl_svr_is(SVR_8548) || fsl_svr_is(SVR_8548_E)) &&
+	     fsl_svr_older_than(2, 1)) {
+		if (of_device_is_compatible(hose->dn, "fsl,mpc8540-pci")) {
+			/* disable OWMSV and ORMSV error capture */
+			setbits32(&pci->pcier.pecdr, OWMSV | ORMSV);
+			/* disable OWMSV and ORMSV error reporting */
+			clrbits32(&pci->pcier.peer, OWMSV | ORMSV);
+		}
+	}
+
 	/* Disable all windows (except powar0 since it's ignored) */
 	for(i = 1; i < 5; i++)
 		out_be32(&pci->pow[i].powar, 0);
diff --git a/arch/powerpc/sysdev/fsl_pci.h b/arch/powerpc/sysdev/fsl_pci.h
index a39ed5c..f09a78d 100644
--- a/arch/powerpc/sysdev/fsl_pci.h
+++ b/arch/powerpc/sysdev/fsl_pci.h
@@ -43,6 +43,45 @@ struct pci_inbound_window_regs {
 	u8	res2[12];
 };
 
+/* PCI Error Management Registers */
+struct pci_err_regs {
+	/*   0x.e00 - PCI Error Detect Register */
+	__be32	pedr;
+	/*   0x.e04 - PCI Error Capture Disable Register */
+	__be32	pecdr;
+	/*   0x.e08 - PCI Error Interrupt Enable Register */
+	__be32	peer;
+	/*   0x.e0c - PCI Error Attributes Capture Register */
+	__be32	peattrcr;
+	/*   0x.e10 - PCI Error Address Capture Register */
+	__be32	peaddrcr;
+	/*   0x.e14 - PCI Error Extended Address Capture Register */
+	__be32	peextaddrcr;
+	/*   0x.e18 - PCI Error Data Low Capture Register */
+	__be32	pedlcr;
+	/*   0x.e1c - PCI Error Data High Capture Register */
+	__be32	pedhcr;
+	/*   0x.e20 - PCI Gasket Timer Register */
+	__be32	gas_timr;
+	u8	res21[4];
+};
+
+/* PCI Express Error Management Registers */
+struct pcie_err_regs {
+	/*  0x.e00 - PCI/PCIE error detect register */
+	__be32	pex_err_dr;
+	u8	res21[4];
+	/*  0x.e08 - PCI/PCIE error interrupt enable register */
+	__be32	pex_err_en;
+	u8	res22[4];
+	/*  0x.e10 - PCI/PCIE error disable register */
+	__be32	pex_err_disr;
+	u8	res23[12];
+	/*  0x.e20 - PCI/PCIE error capture status register */
+	__be32	pex_err_cap_stat;
+	u8	res24[4];
+};
+
 /* PCI/PCI Express IO block registers for 85xx/86xx */
 struct ccsr_pci {
 	__be32	config_addr;		/* 0x.000 - PCI/PCIE Configuration Address Register */
@@ -73,15 +112,11 @@ struct ccsr_pci {
  * define an inbound window base extended address register.
  */
 	struct pci_inbound_window_regs piw[4];
-
-	__be32	pex_err_dr;		/* 0x.e00 - PCI/PCIE error detect register */
-	u8	res21[4];
-	__be32	pex_err_en;		/* 0x.e08 - PCI/PCIE error interrupt enable register */
-	u8	res22[4];
-	__be32	pex_err_disr;		/* 0x.e10 - PCI/PCIE error disable register */
-	u8	res23[12];
-	__be32	pex_err_cap_stat;	/* 0x.e20 - PCI/PCIE error capture status register */
-	u8	res24[4];
+/* PCI/PCI Express Error Management Registers */
+	union {
+		struct pci_err_regs pcier;
+		struct pcie_err_regs pexer;
+	};
 	__be32	pex_err_cap_r0;		/* 0x.e28 - PCIE error capture register 0 */
 	__be32	pex_err_cap_r1;		/* 0x.e2c - PCIE error capture register 0 */
 	__be32	pex_err_cap_r2;		/* 0x.e30 - PCIE error capture register 0 */
-- 
1.6.4.1