Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
  powerpc/fsl_rio: Error interrupt handler for sRIO on MPC85xx
  powerpc/fsl_rio: move machine_check handler
  powerpc/fsl_lbc: Add workaround for ELBC-A001 erratum

5 files changed, 107 insertions, 22 deletions

diff --git a/arch/powerpc/include/asm/fsl_lbc.h b/arch/powerpc/include/asm/fsl_lbc.h
index 5c1bf346674..8a0b5ece8f7 100644
--- a/arch/powerpc/include/asm/fsl_lbc.h
+++ b/arch/powerpc/include/asm/fsl_lbc.h
@@ -157,6 +157,8 @@ struct fsl_lbc_regs {
 #define LBCR_EPAR_SHIFT    16
 #define LBCR_BMT   0x0000FF00
 #define LBCR_BMT_SHIFT      8
+#define LBCR_BMTPS 0x0000000F
+#define LBCR_BMTPS_SHIFT    0
 #define LBCR_INIT  0x00040000
 	__be32 lcrr;            /**< Clock Ratio Register */
 #define LCRR_DBYP    0x80000000
diff --git a/arch/powerpc/include/asm/rio.h b/arch/powerpc/include/asm/rio.h
index 0018bf80cb2..d902abd3399 100644
--- a/arch/powerpc/include/asm/rio.h
+++ b/arch/powerpc/include/asm/rio.h
@@ -14,5 +14,10 @@
 #define ASM_PPC_RIO_H
 
 extern void platform_rio_init(void);
+#ifdef CONFIG_RAPIDIO
+extern int fsl_rio_mcheck_exception(struct pt_regs *);
+#else
+static inline int fsl_rio_mcheck_exception(struct pt_regs *regs) {return 0; }
+#endif
 
 #endif				/* ASM_PPC_RIO_H */
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index b13306b0d92..0ff4ab98d50 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -55,6 +55,7 @@
 #endif
 #include <asm/kexec.h>
 #include <asm/ppc-opcode.h>
+#include <asm/rio.h>
 
 #if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC)
 int (*__debugger)(struct pt_regs *regs) __read_mostly;
@@ -424,6 +425,12 @@ int machine_check_e500mc(struct pt_regs *regs)
 	unsigned long reason = mcsr;
 	int recoverable = 1;
 
+	if (reason & MCSR_BUS_RBERR) {
+		recoverable = fsl_rio_mcheck_exception(regs);
+		if (recoverable == 1)
+			goto silent_out;
+	}
+
 	printk("Machine check in kernel mode.\n");
 	printk("Caused by (from MCSR=%lx): ", reason);
 
@@ -499,6 +506,7 @@ int machine_check_e500mc(struct pt_regs *regs)
 		       reason & MCSR_MEA ? "Effective" : "Physical", addr);
 	}
 
+silent_out:
 	mtspr(SPRN_MCSR, mcsr);
 	return mfspr(SPRN_MCSR) == 0 && recoverable;
 }
@@ -507,6 +515,11 @@ int machine_check_e500(struct pt_regs *regs)
 {
 	unsigned long reason = get_mc_reason(regs);
 
+	if (reason & MCSR_BUS_RBERR) {
+		if (fsl_rio_mcheck_exception(regs))
+			return 1;
+	}
+
 	printk("Machine check in kernel mode.\n");
 	printk("Caused by (from MCSR=%lx): ", reason);
 
diff --git a/arch/powerpc/sysdev/fsl_lbc.c b/arch/powerpc/sysdev/fsl_lbc.c
index 4fcb5a4e60d..0608b1657da 100644
--- a/arch/powerpc/sysdev/fsl_lbc.c
+++ b/arch/powerpc/sysdev/fsl_lbc.c
@@ -184,7 +184,8 @@ int fsl_upm_run_pattern(struct fsl_upm *upm, void __iomem *io_base, u32 mar)
 }
 EXPORT_SYMBOL(fsl_upm_run_pattern);
 
-static int __devinit fsl_lbc_ctrl_init(struct fsl_lbc_ctrl *ctrl)
+static int __devinit fsl_lbc_ctrl_init(struct fsl_lbc_ctrl *ctrl,
+				       struct device_node *node)
 {
 	struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
 
@@ -198,6 +199,10 @@ static int __devinit fsl_lbc_ctrl_init(struct fsl_lbc_ctrl *ctrl)
 	/* Enable interrupts for any detected events */
 	out_be32(&lbc->lteir, LTEIR_ENABLE);
 
+	/* Set the monitor timeout value to the maximum for erratum A001 */
+	if (of_device_is_compatible(node, "fsl,elbc"))
+		clrsetbits_be32(&lbc->lbcr, LBCR_BMT, LBCR_BMTPS);
+
 	return 0;
 }
 
@@ -304,7 +309,7 @@ static int __devinit fsl_lbc_ctrl_probe(struct platform_device *dev)
 
 	fsl_lbc_ctrl_dev->dev = &dev->dev;
 
-	ret = fsl_lbc_ctrl_init(fsl_lbc_ctrl_dev);
+	ret = fsl_lbc_ctrl_init(fsl_lbc_ctrl_dev, dev->dev.of_node);
 	if (ret < 0)
 		goto err;
 
diff --git a/arch/powerpc/sysdev/fsl_rio.c b/arch/powerpc/sysdev/fsl_rio.c
index 49798532b47..5b206a2fe17 100644
--- a/arch/powerpc/sysdev/fsl_rio.c
+++ b/arch/powerpc/sysdev/fsl_rio.c
@@ -10,7 +10,7 @@
  * - Added Port-Write message handling
  * - Added Machine Check exception handling
  *
- * Copyright (C) 2007, 2008 Freescale Semiconductor, Inc.
+ * Copyright (C) 2007, 2008, 2010 Freescale Semiconductor, Inc.
  * Zhang Wei <wei.zhang@freescale.com>
  *
  * Copyright 2005 MontaVista Software, Inc.
@@ -47,15 +47,33 @@
 #define IRQ_RIO_RX(m)		(((struct rio_priv *)(m->priv))->rxirq)
 #define IRQ_RIO_PW(m)		(((struct rio_priv *)(m->priv))->pwirq)
 
+#define IPWSR_CLEAR		0x98
+#define OMSR_CLEAR		0x1cb3
+#define IMSR_CLEAR		0x491
+#define IDSR_CLEAR		0x91
+#define ODSR_CLEAR		0x1c00
+#define LTLEECSR_ENABLE_ALL	0xFFC000FC
+#define ESCSR_CLEAR		0x07120204
+
+#define RIO_PORT1_EDCSR		0x0640
+#define RIO_PORT2_EDCSR		0x0680
+#define RIO_PORT1_IECSR		0x10130
+#define RIO_PORT2_IECSR		0x101B0
+#define RIO_IM0SR		0x13064
+#define RIO_IM1SR		0x13164
+#define RIO_OM0SR		0x13004
+#define RIO_OM1SR		0x13104
+
 #define RIO_ATMU_REGS_OFFSET	0x10c00
 #define RIO_P_MSG_REGS_OFFSET	0x11000
 #define RIO_S_MSG_REGS_OFFSET	0x13000
 #define RIO_GCCSR		0x13c
 #define RIO_ESCSR		0x158
+#define RIO_PORT2_ESCSR		0x178
 #define RIO_CCSR		0x15c
 #define RIO_LTLEDCSR		0x0608
-#define  RIO_LTLEDCSR_IER	0x80000000
-#define  RIO_LTLEDCSR_PRT	0x01000000
+#define RIO_LTLEDCSR_IER	0x80000000
+#define RIO_LTLEDCSR_PRT	0x01000000
 #define RIO_LTLEECSR		0x060c
 #define RIO_EPWISR		0x10010
 #define RIO_ISR_AACR		0x10120
@@ -88,7 +106,10 @@
 #define RIO_IPWSR_PWD		0x00000008
 #define RIO_IPWSR_PWB		0x00000004
 
-#define RIO_EPWISR_PINT		0x80000000
+/* EPWISR Error match value */
+#define RIO_EPWISR_PINT1	0x80000000
+#define RIO_EPWISR_PINT2	0x40000000
+#define RIO_EPWISR_MU		0x00000002
 #define RIO_EPWISR_PW		0x00000001
 
 #define RIO_MSG_DESC_SIZE	32
@@ -260,9 +281,7 @@ struct rio_priv {
 static void __iomem *rio_regs_win;
 
 #ifdef CONFIG_E500
-static int (*saved_mcheck_exception)(struct pt_regs *regs);
-
-static int fsl_rio_mcheck_exception(struct pt_regs *regs)
+int fsl_rio_mcheck_exception(struct pt_regs *regs)
 {
 	const struct exception_table_entry *entry = NULL;
 	unsigned long reason = mfspr(SPRN_MCSR);
@@ -284,11 +303,9 @@ static int fsl_rio_mcheck_exception(struct pt_regs *regs)
 		}
 	}
 
-	if (saved_mcheck_exception)
-		return saved_mcheck_exception(regs);
-	else
-		return cur_cpu_spec->machine_check(regs);
+	return 0;
 }
+EXPORT_SYMBOL_GPL(fsl_rio_mcheck_exception);
 #endif
 
 /**
@@ -1064,6 +1081,40 @@ static int fsl_rio_doorbell_init(struct rio_mport *mport)
 	return rc;
 }
 
+static void port_error_handler(struct rio_mport *port, int offset)
+{
+	/*XXX: Error recovery is not implemented, we just clear errors */
+	out_be32((u32 *)(rio_regs_win + RIO_LTLEDCSR), 0);
+
+	if (offset == 0) {
+		out_be32((u32 *)(rio_regs_win + RIO_PORT1_EDCSR), 0);
+		out_be32((u32 *)(rio_regs_win + RIO_PORT1_IECSR), 0);
+		out_be32((u32 *)(rio_regs_win + RIO_ESCSR), ESCSR_CLEAR);
+	} else {
+		out_be32((u32 *)(rio_regs_win + RIO_PORT2_EDCSR), 0);
+		out_be32((u32 *)(rio_regs_win + RIO_PORT2_IECSR), 0);
+		out_be32((u32 *)(rio_regs_win + RIO_PORT2_ESCSR), ESCSR_CLEAR);
+	}
+}
+
+static void msg_unit_error_handler(struct rio_mport *port)
+{
+	struct rio_priv *priv = port->priv;
+
+	/*XXX: Error recovery is not implemented, we just clear errors */
+	out_be32((u32 *)(rio_regs_win + RIO_LTLEDCSR), 0);
+
+	out_be32((u32 *)(rio_regs_win + RIO_IM0SR), IMSR_CLEAR);
+	out_be32((u32 *)(rio_regs_win + RIO_IM1SR), IMSR_CLEAR);
+	out_be32((u32 *)(rio_regs_win + RIO_OM0SR), OMSR_CLEAR);
+	out_be32((u32 *)(rio_regs_win + RIO_OM1SR), OMSR_CLEAR);
+
+	out_be32(&priv->msg_regs->odsr, ODSR_CLEAR);
+	out_be32(&priv->msg_regs->dsr, IDSR_CLEAR);
+
+	out_be32(&priv->msg_regs->pwsr, IPWSR_CLEAR);
+}
+
 /**
  * fsl_rio_port_write_handler - MPC85xx port write interrupt handler
  * @irq: Linux interrupt number
@@ -1144,10 +1195,22 @@ fsl_rio_port_write_handler(int irq, void *dev_instance)
 	}
 
 pw_done:
-	if (epwisr & RIO_EPWISR_PINT) {
+	if (epwisr & RIO_EPWISR_PINT1) {
+		tmp = in_be32(priv->regs_win + RIO_LTLEDCSR);
+		pr_debug("RIO_LTLEDCSR = 0x%x\n", tmp);
+		port_error_handler(port, 0);
+	}
+
+	if (epwisr & RIO_EPWISR_PINT2) {
 		tmp = in_be32(priv->regs_win + RIO_LTLEDCSR);
 		pr_debug("RIO_LTLEDCSR = 0x%x\n", tmp);
-		out_be32(priv->regs_win + RIO_LTLEDCSR, 0);
+		port_error_handler(port, 1);
+	}
+
+	if (epwisr & RIO_EPWISR_MU) {
+		tmp = in_be32(priv->regs_win + RIO_LTLEDCSR);
+		pr_debug("RIO_LTLEDCSR = 0x%x\n", tmp);
+		msg_unit_error_handler(port);
 	}
 
 	return IRQ_HANDLED;
@@ -1258,12 +1321,14 @@ static int fsl_rio_port_write_init(struct rio_mport *mport)
 
 
 	/* Hook up port-write handler */
-	rc = request_irq(IRQ_RIO_PW(mport), fsl_rio_port_write_handler, 0,
-			 "port-write", (void *)mport);
+	rc = request_irq(IRQ_RIO_PW(mport), fsl_rio_port_write_handler,
+			IRQF_SHARED, "port-write", (void *)mport);
 	if (rc < 0) {
 		pr_err("MPC85xx RIO: unable to request inbound doorbell irq");
 		goto err_out;
 	}
+	/* Enable Error Interrupt */
+	out_be32((u32 *)(rio_regs_win + RIO_LTLEECSR), LTLEECSR_ENABLE_ALL);
 
 	INIT_WORK(&priv->pw_work, fsl_pw_dpc);
 	spin_lock_init(&priv->pw_fifo_lock);
@@ -1538,11 +1603,6 @@ int fsl_rio_setup(struct platform_device *dev)
 	fsl_rio_doorbell_init(port);
 	fsl_rio_port_write_init(port);
 
-#ifdef CONFIG_E500
-	saved_mcheck_exception = ppc_md.machine_check_exception;
-	ppc_md.machine_check_exception = fsl_rio_mcheck_exception;
-#endif
-
 	return 0;
 err:
 	iounmap(priv->regs_win);