[PATCH][PPC32] Add PPC440GX L2C error handler
Matt Porter
mporter at kernel.crashing.org
Sat Nov 6 10:59:21 EST 2004
This patch adds an L2-Cache error handler. In addition,
it reenables setup of the L2 cache based on erratum
L2C0_1 now that we have been reassured that there are
no more faulty parts being shipped. If there is a
problem, the error handler will report it.
Signed-off-by: Eugene Surovegin <ebs at ebshome.net>
Signed-off-by: Matt Porter <mporter at kernel.crashing.org>
===== arch/ppc/syslib/ibm440gx_common.c 1.2 vs edited =====
--- 1.2/arch/ppc/syslib/ibm440gx_common.c 2004-10-18 22:26:41 -07:00
+++ edited/arch/ppc/syslib/ibm440gx_common.c 2004-11-05 16:28:07 -07:00
@@ -4,7 +4,7 @@
* PPC440GX system library
*
* Eugene Surovegin <eugene.surovegin at zultys.com> or <ebs at ebshome.net>
- * Copyright (c) 2003 Zultys Technologies
+ * Copyright (c) 2003, 2004 Zultys Technologies
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
@@ -14,6 +14,7 @@
*/
#include <linux/config.h>
#include <linux/kernel.h>
+#include <linux/interrupt.h>
#include <asm/ibm44x.h>
#include <asm/mmu.h>
#include <asm/processor.h>
@@ -97,10 +98,51 @@
p->uart1 = p->plb / __fix_zero(uart1 & 0xff, 256);
}
-/* Enable L2 cache (call with IRQs disabled) */
+/* Issue L2C diagnostic command */
+static inline u32 l2c_diag(u32 addr)
+{
+ mtdcr(DCRN_L2C0_ADDR, addr);
+ mtdcr(DCRN_L2C0_CMD, L2C_CMD_DIAG);
+ while (!(mfdcr(DCRN_L2C0_SR) & L2C_SR_CC)) ;
+ return mfdcr(DCRN_L2C0_DATA);
+}
+
+static irqreturn_t l2c_error_handler(int irq, void* dev, struct pt_regs* regs)
+{
+ u32 sr = mfdcr(DCRN_L2C0_SR);
+ if (sr & L2C_SR_CPE){
+ /* Read cache trapped address */
+ u32 addr = l2c_diag(0x42000000);
+ printk(KERN_EMERG "L2C: Cache Parity Error, addr[16:26] = 0x%08x\n", addr);
+ }
+ if (sr & L2C_SR_TPE){
+ /* Read tag trapped address */
+ u32 addr = l2c_diag(0x82000000) >> 16;
+ printk(KERN_EMERG "L2C: Tag Parity Error, addr[16:26] = 0x%08x\n", addr);
+ }
+
+ /* Clear parity errors */
+ if (sr & (L2C_SR_CPE | L2C_SR_TPE)){
+ mtdcr(DCRN_L2C0_ADDR, 0);
+ mtdcr(DCRN_L2C0_CMD, L2C_CMD_CCP | L2C_CMD_CTE);
+ } else
+ printk(KERN_EMERG "L2C: LRU error\n");
+
+ return IRQ_HANDLED;
+}
+
+/* Enable L2 cache */
void __init ibm440gx_l2c_enable(void){
u32 r;
-
+ unsigned long flags;
+
+ /* Install error handler */
+ if (request_irq(87, l2c_error_handler, SA_INTERRUPT, "L2C", 0) < 0){
+ printk(KERN_ERR "Cannot install L2C error handler, cache is not enabled\n");
+ return;
+ }
+
+ local_irq_save(flags);
asm volatile ("sync" ::: "memory");
/* Disable SRAM */
@@ -137,20 +179,22 @@
/* Enable ICU/DCU ports */
r = mfdcr(DCRN_L2C0_CFG);
- r &= ~(L2C_CFG_DCW_MASK | L2C_CFG_CPIM | L2C_CFG_TPIM | L2C_CFG_LIM
- | L2C_CFG_PMUX_MASK | L2C_CFG_PMIM | L2C_CFG_TPEI | L2C_CFG_CPEI
- | L2C_CFG_NAM | L2C_CFG_NBRM);
- r |= L2C_CFG_ICU | L2C_CFG_DCU | L2C_CFG_TPC | L2C_CFG_CPC | L2C_CFG_FRAN
- | L2C_CFG_SMCM;
+ r &= ~(L2C_CFG_DCW_MASK | L2C_CFG_PMUX_MASK | L2C_CFG_PMIM | L2C_CFG_TPEI
+ | L2C_CFG_CPEI | L2C_CFG_NAM | L2C_CFG_NBRM);
+ r |= L2C_CFG_ICU | L2C_CFG_DCU | L2C_CFG_TPC | L2C_CFG_CPC | L2C_CFG_FRAN
+ | L2C_CFG_CPIM | L2C_CFG_TPIM | L2C_CFG_LIM | L2C_CFG_SMCM;
mtdcr(DCRN_L2C0_CFG, r);
asm volatile ("sync; isync" ::: "memory");
+ local_irq_restore(flags);
}
-/* Disable L2 cache (call with IRQs disabled) */
+/* Disable L2 cache */
void __init ibm440gx_l2c_disable(void){
u32 r;
+ unsigned long flags;
+ local_irq_save(flags);
asm volatile ("sync" ::: "memory");
/* Disable L2C mode */
@@ -169,6 +213,7 @@
SRAM_SBCR_BAS3 | SRAM_SBCR_BS_64KB | SRAM_SBCR_BU_RW);
asm volatile ("sync; isync" ::: "memory");
+ local_irq_restore(flags);
}
void __init ibm440gx_l2c_setup(struct ibm44x_clocks* p)
===== arch/ppc/platforms/4xx/ocotea.c 1.10 vs edited =====
--- 1.10/arch/ppc/platforms/4xx/ocotea.c 2004-11-02 07:40:33 -07:00
+++ edited/arch/ppc/platforms/4xx/ocotea.c 2004-11-05 16:28:06 -07:00
@@ -145,13 +145,13 @@
}
#define PCIX_READW(offset) \
- (readw((u32)pcix_reg_base+offset))
+ (readw(pcix_reg_base+offset))
#define PCIX_WRITEW(value, offset) \
- (writew(value, (u32)pcix_reg_base+offset))
+ (writew(value, pcix_reg_base+offset))
#define PCIX_WRITEL(value, offset) \
- (writel(value, (u32)pcix_reg_base+offset))
+ (writel(value, pcix_reg_base+offset))
/*
* FIXME: This is only here to "make it work". This will move
@@ -321,6 +321,11 @@
printk("IBM Ocotea port (MontaVista Software, Inc. <source at mvista.com>)\n");
}
+static void __init ocotea_init(void)
+{
+ ibm440gx_l2c_setup(&clocks);
+}
+
void __init platform_init(unsigned long r3, unsigned long r4,
unsigned long r5, unsigned long r6, unsigned long r7)
{
@@ -341,13 +346,12 @@
*/
ibm440gx_get_clocks(&clocks, 33333333, 6 * 1843200);
ocp_sys_info.opb_bus_freq = clocks.opb;
-
- /*
- * Always disable L2 cache. All revs/speeds of silicon
- * have parity error problems despite errata claims to
- * the contrary.
+
+ /* XXX Fix L2C IRQ triggerring setting (edge-sensitive).
+ * Firmware (at least PIBS v1.72 OCT/28/2003) sets it incorrectly
+ * --ebs
*/
- ibm440gx_l2c_disable();
+ mtdcr(DCRN_UIC_TR(UIC2), mfdcr(DCRN_UIC_TR(UIC2)) | 0x00000100);
ibm44x_platform_init();
@@ -365,4 +369,5 @@
#ifdef CONFIG_KGDB
ppc_md.early_serial_map = ocotea_early_serial_map;
#endif
+ ppc_md.init = ocotea_init;
}
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