[MIPS] TXx9: PCI error handling

From: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Date: Thu, 24 Jul 2008 00:25:16 +0900
Subject: [PATCH] txx9: PCI error handling

Add more control and detailed report on PCI error interrupt.
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/pci/ops-tx3927.c

@@ -37,8 +37,11 @@
 #include <linux/pci.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include <linux/interrupt.h>
 
 #include <asm/addrspace.h>
+#include <asm/txx9irq.h>
+#include <asm/txx9/pci.h>
 #include <asm/txx9/tx3927.h>
 
 static int mkaddr(struct pci_bus *bus, unsigned char devfn, unsigned char where)
@@ -194,3 +197,34 @@ void __init tx3927_pcic_setup(struct pci_controller *channel,
 		PCI_COMMAND_PARITY | PCI_COMMAND_SERR;
 	local_irq_restore(flags);
 }
+
+static irqreturn_t tx3927_pcierr_interrupt(int irq, void *dev_id)
+{
+	struct pt_regs *regs = get_irq_regs();
+
+	if (txx9_pci_err_action != TXX9_PCI_ERR_IGNORE) {
+		printk(KERN_WARNING "PCI error interrupt at 0x%08lx.\n",
+		       regs->cp0_epc);
+		printk(KERN_WARNING "pcistat:%02x, lbstat:%04lx\n",
+		       tx3927_pcicptr->pcistat, tx3927_pcicptr->lbstat);
+	}
+	if (txx9_pci_err_action != TXX9_PCI_ERR_PANIC) {
+		/* clear all pci errors */
+		tx3927_pcicptr->pcistat |= TX3927_PCIC_PCISTATIM_ALL;
+		tx3927_pcicptr->istat = TX3927_PCIC_IIM_ALL;
+		tx3927_pcicptr->tstat = TX3927_PCIC_TIM_ALL;
+		tx3927_pcicptr->lbstat = TX3927_PCIC_LBIM_ALL;
+		return IRQ_HANDLED;
+	}
+	console_verbose();
+	panic("PCI error.");
+}
+
+void __init tx3927_setup_pcierr_irq(void)
+{
+	if (request_irq(TXX9_IRQ_BASE + TX3927_IR_PCI,
+			tx3927_pcierr_interrupt,
+			IRQF_DISABLED, "PCI error",
+			(void *)TX3927_PCIC_REG))
+		printk(KERN_WARNING "Failed to request irq for PCIERR\n");
+}

arch/mips/pci/ops-tx4927.c

@@ -16,6 +16,8 @@
  * option) any later version.
  */
 #include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <asm/txx9/pci.h>
 #include <asm/txx9/tx4927pcic.h>
 
 static struct {
@@ -431,6 +433,66 @@ void tx4927_report_pcic_status(void)
 	}
 }
 
+static void tx4927_dump_pcic_settings1(struct tx4927_pcic_reg __iomem *pcicptr)
+{
+	int i;
+	__u32 __iomem *preg = (__u32 __iomem *)pcicptr;
+
+	printk(KERN_INFO "tx4927 pcic (0x%p) settings:", pcicptr);
+	for (i = 0; i < sizeof(struct tx4927_pcic_reg); i += 4, preg++) {
+		if (i % 32 == 0) {
+			printk(KERN_CONT "\n");
+			printk(KERN_INFO "%04x:", i);
+		}
+		/* skip registers with side-effects */
+		if (i == offsetof(struct tx4927_pcic_reg, g2pintack)
+		    || i == offsetof(struct tx4927_pcic_reg, g2pspc)
+		    || i == offsetof(struct tx4927_pcic_reg, g2pcfgadrs)
+		    || i == offsetof(struct tx4927_pcic_reg, g2pcfgdata)) {
+			printk(KERN_CONT " XXXXXXXX");
+			continue;
+		}
+		printk(KERN_CONT " %08x", __raw_readl(preg));
+	}
+	printk(KERN_CONT "\n");
+}
+
+void tx4927_dump_pcic_settings(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(pcicptrs); i++) {
+		if (pcicptrs[i].pcicptr)
+			tx4927_dump_pcic_settings1(pcicptrs[i].pcicptr);
+	}
+}
+
+irqreturn_t tx4927_pcierr_interrupt(int irq, void *dev_id)
+{
+	struct pt_regs *regs = get_irq_regs();
+	struct tx4927_pcic_reg __iomem *pcicptr =
+		(struct tx4927_pcic_reg __iomem *)(unsigned long)dev_id;
+
+	if (txx9_pci_err_action != TXX9_PCI_ERR_IGNORE) {
+		printk(KERN_WARNING "PCIERR interrupt at 0x%0*lx\n",
+		       (int)(2 * sizeof(unsigned long)), regs->cp0_epc);
+		tx4927_report_pcic_status1(pcicptr);
+	}
+	if (txx9_pci_err_action != TXX9_PCI_ERR_PANIC) {
+		/* clear all pci errors */
+		__raw_writel((__raw_readl(&pcicptr->pcistatus) & 0x0000ffff)
+			     | (TX4927_PCIC_PCISTATUS_ALL << 16),
+			     &pcicptr->pcistatus);
+		__raw_writel(TX4927_PCIC_G2PSTATUS_ALL, &pcicptr->g2pstatus);
+		__raw_writel(TX4927_PCIC_PBASTATUS_ALL, &pcicptr->pbastatus);
+		__raw_writel(TX4927_PCIC_PCICSTATUS_ALL, &pcicptr->pcicstatus);
+		return IRQ_HANDLED;
+	}
+	console_verbose();
+	tx4927_dump_pcic_settings1(pcicptr);
+	panic("PCI error.");
+}
+
 #ifdef CONFIG_TOSHIBA_FPCIB0
 static void __init tx4927_quirk_slc90e66_bridge(struct pci_dev *dev)
 {

arch/mips/pci/pci-tx4927.c

@@ -15,6 +15,7 @@
 #include <linux/init.h>
 #include <linux/pci.h>
 #include <linux/kernel.h>
+#include <linux/interrupt.h>
 #include <asm/txx9/generic.h>
 #include <asm/txx9/tx4927.h>
 
@@ -81,3 +82,12 @@ int __init tx4927_pciclk66_setup(void)
 		pciclk = -1;
 	return pciclk;
 }
+
+void __init tx4927_setup_pcierr_irq(void)
+{
+	if (request_irq(TXX9_IRQ_BASE + TX4927_IR_PCIERR,
+			tx4927_pcierr_interrupt,
+			IRQF_DISABLED, "PCI error",
+			(void *)TX4927_PCIC_REG))
+		printk(KERN_WARNING "Failed to request irq for PCIERR\n");
+}

arch/mips/pci/pci-tx4938.c

@@ -15,6 +15,7 @@
 #include <linux/init.h>
 #include <linux/pci.h>
 #include <linux/kernel.h>
+#include <linux/interrupt.h>
 #include <asm/txx9/generic.h>
 #include <asm/txx9/tx4938.h>
 
@@ -132,3 +133,12 @@ int tx4938_pcic1_map_irq(const struct pci_dev *dev, u8 slot)
 	}
 	return -1;
 }
+
+void __init tx4938_setup_pcierr_irq(void)
+{
+	if (request_irq(TXX9_IRQ_BASE + TX4938_IR_PCIERR,
+			tx4927_pcierr_interrupt,
+			IRQF_DISABLED, "PCI error",
+			(void *)TX4927_PCIC_REG))
+		printk(KERN_WARNING "Failed to request irq for PCIERR\n");
+}

arch/mips/txx9/jmr3927/irq.c

@@ -103,22 +103,6 @@ static int jmr3927_irq_dispatch(int pending)
 	return irq;
 }
 
-#ifdef CONFIG_PCI
-static irqreturn_t jmr3927_pcierr_interrupt(int irq, void *dev_id)
-{
-	printk(KERN_WARNING "PCI error interrupt (irq 0x%x).\n", irq);
-	printk(KERN_WARNING "pcistat:%02x, lbstat:%04lx\n",
-	       tx3927_pcicptr->pcistat, tx3927_pcicptr->lbstat);
-
-	return IRQ_HANDLED;
-}
-static struct irqaction pcierr_action = {
-	.handler = jmr3927_pcierr_interrupt,
-	.mask = CPU_MASK_NONE,
-	.name = "PCI error",
-};
-#endif
-
 static void __init jmr3927_irq_init(void);
 
 void __init jmr3927_irq_setup(void)
@@ -143,10 +127,6 @@ void __init jmr3927_irq_setup(void)
 	/* setup IOC interrupt 1 (PCI, MODEM) */
 	set_irq_chained_handler(JMR3927_IRQ_IOCINT, handle_simple_irq);
 
-#ifdef CONFIG_PCI
-	setup_irq(JMR3927_IRQ_IRC_PCI, &pcierr_action);
-#endif
-
 	/* enable all CPU interrupt bits. */
 	set_c0_status(ST0_IM);	/* IE bit is still 0. */
 }

arch/mips/txx9/jmr3927/setup.c

@@ -199,6 +199,7 @@ static void __init jmr3927_pci_setup(void)
 		jmr3927_ioc_reg_out(0, JMR3927_IOC_RESET_ADDR);
 	}
 	tx3927_pcic_setup(c, JMR3927_SDRAM_SIZE, extarb);
+	tx3927_setup_pcierr_irq();
 #endif /* CONFIG_PCI */
 }
 

arch/mips/txx9/rbtx4927/setup.c

@@ -103,6 +103,7 @@ static void __init tx4927_pci_setup(void)
 		tx4927_report_pciclk();
 		tx4927_pcic_setup(tx4927_pcicptr, c, extarb);
 	}
+	tx4927_setup_pcierr_irq();
 }
 
 static void __init tx4937_pci_setup(void)
@@ -149,6 +150,7 @@ static void __init tx4937_pci_setup(void)
 		tx4938_report_pciclk();
 		tx4927_pcic_setup(tx4938_pcicptr, c, extarb);
 	}
+	tx4938_setup_pcierr_irq();
 }
 
 static void __init rbtx4927_arch_init(void)

arch/mips/txx9/rbtx4938/setup.c

@@ -121,6 +121,7 @@ static void __init rbtx4938_pci_setup(void)
 		register_pci_controller(c);
 		tx4927_pcic_setup(tx4938_pcic1ptr, c, 0);
 	}
+	tx4938_setup_pcierr_irq();
 #endif /* CONFIG_PCI */
 }
 

include/asm-mips/txx9/tx3927.h

@@ -236,11 +236,17 @@ struct tx3927_ccfg_reg {
 /* see PCI_STATUS_XXX in linux/pci.h */
 #define PCI_STATUS_NEW_CAP	0x0010
 
+/* bits for ISTAT/IIM */
+#define TX3927_PCIC_IIM_ALL	0x00001600
+
 /* bits for TC */
 #define TX3927_PCIC_TC_OF16E	0x00000020
 #define TX3927_PCIC_TC_IF8E	0x00000010
 #define TX3927_PCIC_TC_OF8E	0x00000008
 
+/* bits for TSTAT/TIM */
+#define TX3927_PCIC_TIM_ALL	0x0003ffff
+
 /* bits for IOBA/MBA */
 /* see PCI_BASE_ADDRESS_XXX in linux/pci.h */
 
@@ -320,5 +326,6 @@ struct tx3927_ccfg_reg {
 struct pci_controller;
 void __init tx3927_pcic_setup(struct pci_controller *channel,
 			      unsigned long sdram_size, int extarb);
+void tx3927_setup_pcierr_irq(void);
 
 #endif /* __ASM_TXX9_TX3927_H */

include/asm-mips/txx9/tx4927.h

@@ -249,6 +249,7 @@ void tx4927_time_init(unsigned int tmrnr);
 void tx4927_setup_serial(void);
 int tx4927_report_pciclk(void);
 int tx4927_pciclk66_setup(void);
+void tx4927_setup_pcierr_irq(void);
 void tx4927_irq_init(void);
 
 #endif /* __ASM_TXX9_TX4927_H */

include/asm-mips/txx9/tx4927pcic.h

@@ -10,6 +10,7 @@
 #define __ASM_TXX9_TX4927PCIC_H
 
 #include <linux/pci.h>
+#include <linux/irqreturn.h>
 
 struct tx4927_pcic_reg {
 	u32 pciid;
@@ -196,5 +197,7 @@ void __init tx4927_pcic_setup(struct tx4927_pcic_reg __iomem *pcicptr,
 			      struct pci_controller *channel, int extarb);
 void tx4927_report_pcic_status(void);
 char *tx4927_pcibios_setup(char *str);
+void tx4927_dump_pcic_settings(void);
+irqreturn_t tx4927_pcierr_interrupt(int irq, void *dev_id);
 
 #endif /* __ASM_TXX9_TX4927PCIC_H */

include/asm-mips/txx9/tx4938.h

@@ -285,6 +285,7 @@ void tx4938_report_pci1clk(void);
 int tx4938_pciclk66_setup(void);
 struct pci_dev;
 int tx4938_pcic1_map_irq(const struct pci_dev *dev, u8 slot);
+void tx4938_setup_pcierr_irq(void);
 void tx4938_irq_init(void);
 
 #endif