1 files changed, 256 insertions, 0 deletions

diff --git a/arch/mips/sibyte/common/bus_watcher.c b/arch/mips/sibyte/common/bus_watcher.c
new file mode 100644
index 000000000000..5581844c9194
--- /dev/null
+++ b/arch/mips/sibyte/common/bus_watcher.c
@@ -0,0 +1,256 @@
+/*
+ * Copyright (C) 2002,2003 Broadcom Corporation
+ *
+ * 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 Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+/*
+ * The Bus Watcher monitors internal bus transactions and maintains
+ * counts of transactions with error status, logging details and
+ * causing one of several interrupts.  This driver provides a handler
+ * for those interrupts which aggregates the counts (to avoid
+ * saturating the 8-bit counters) and provides a presence in
+ * /proc/bus_watcher if PROC_FS is on.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <asm/io.h>
+
+#include <asm/sibyte/sb1250.h>
+#include <asm/sibyte/sb1250_regs.h>
+#include <asm/sibyte/sb1250_int.h>
+#include <asm/sibyte/sb1250_scd.h>
+#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
+#include <asm/sibyte/bcm1480_regs.h>
+#endif
+
+
+struct bw_stats_struct {
+        uint64_t status;
+        uint32_t l2_err;
+        uint32_t memio_err;
+        int status_printed;
+        unsigned long l2_cor_d;
+        unsigned long l2_bad_d;
+        unsigned long l2_cor_t;
+        unsigned long l2_bad_t;
+        unsigned long mem_cor_d;
+        unsigned long mem_bad_d;
+        unsigned long bus_error;
+} bw_stats;
+
+
+static void print_summary(uint32_t status, uint32_t l2_err,
+                          uint32_t memio_err)
+{
+        printk("Bus watcher error counters: %08x %08x\n", l2_err, memio_err);
+        printk("\nLast recorded signature:\n");
+        printk("Request %02x from %d, answered by %d with Dcode %d\n",
+               (unsigned int)(G_SCD_BERR_TID(status) & 0x3f),
+               (int)(G_SCD_BERR_TID(status) >> 6),
+               (int)G_SCD_BERR_RID(status),
+               (int)G_SCD_BERR_DCODE(status));
+}
+
+/*
+ * check_bus_watcher is exported for use in situations where we want
+ * to see the most recent status of the bus watcher, which might have
+ * already been destructively read out of the registers.
+ *
+ * notes: this is currently used by the cache error handler
+ *        should provide locking against the interrupt handler
+ */
+void check_bus_watcher(void)
+{
+        u32 status, l2_err, memio_err;
+
+#ifdef CONFIG_SB1_PASS_1_WORKAROUNDS
+        /* Destructive read, clears register and interrupt */
+        status = csr_in32(IOADDR(A_SCD_BUS_ERR_STATUS));
+#elif defined(CONFIG_SIBYTE_BCM112X) || defined(CONFIG_SIBYTE_SB1250)
+        /* Use non-destructive register */
+        status = csr_in32(IOADDR(A_SCD_BUS_ERR_STATUS_DEBUG));
+#elif defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
+        /* Use non-destructive register */
+        /* Same as 1250 except BUS_ERR_STATUS_DEBUG is in a different place. */
+        status = csr_in32(IOADDR(A_BCM1480_BUS_ERR_STATUS_DEBUG));
+#else
+#error bus watcher being built for unknown Sibyte SOC!
+#endif
+        if (!(status & 0x7fffffff)) {
+                printk("Using last values reaped by bus watcher driver\n");
+                status = bw_stats.status;
+                l2_err = bw_stats.l2_err;
+                memio_err = bw_stats.memio_err;
+        } else {
+                l2_err = csr_in32(IOADDR(A_BUS_L2_ERRORS));
+                memio_err = csr_in32(IOADDR(A_BUS_MEM_IO_ERRORS));
+        }
+        if (status & ~(1UL << 31))
+                print_summary(status, l2_err, memio_err);
+        else
+                printk("Bus watcher indicates no error\n");
+}
+
+#ifdef CONFIG_PROC_FS
+
+/* For simplicity, I want to assume a single read is required each
+   time */
+static int bw_proc_show(struct seq_file *m, void *v)
+{
+        struct bw_stats_struct *stats = m->private;
+
+        seq_puts(m, "SiByte Bus Watcher statistics\n");
+        seq_puts(m, "-----------------------------\n");
+        seq_printf(m, "L2-d-cor %8ld\nL2-d-bad %8ld\n",
+                   stats->l2_cor_d, stats->l2_bad_d);
+        seq_printf(m, "L2-t-cor %8ld\nL2-t-bad %8ld\n",
+                   stats->l2_cor_t, stats->l2_bad_t);
+        seq_printf(m, "MC-d-cor %8ld\nMC-d-bad %8ld\n",
+                   stats->mem_cor_d, stats->mem_bad_d);
+        seq_printf(m, "IO-err   %8ld\n", stats->bus_error);
+        seq_puts(m, "\nLast recorded signature:\n");
+        seq_printf(m, "Request %02x from %d, answered by %d with Dcode %d\n",
+                   (unsigned int)(G_SCD_BERR_TID(stats->status) & 0x3f),
+                   (int)(G_SCD_BERR_TID(stats->status) >> 6),
+                   (int)G_SCD_BERR_RID(stats->status),
+                   (int)G_SCD_BERR_DCODE(stats->status));
+        /* XXXKW indicate multiple errors between printings, or stats
+           collection (or both)? */
+        if (stats->status & M_SCD_BERR_MULTERRS)
+                seq_puts(m, "Multiple errors observed since last check.\n");
+        if (stats->status_printed) {
+                seq_puts(m, "(no change since last printing)\n");
+        } else {
+                stats->status_printed = 1;
+        }
+
+        return 0;
+}
+
+static int bw_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, bw_proc_show, PDE_DATA(inode));
+}
+
+static const struct file_operations bw_proc_fops = {
+        .open           = bw_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static void create_proc_decoder(struct bw_stats_struct *stats)
+{
+        struct proc_dir_entry *ent;
+
+        ent = proc_create_data("bus_watcher", S_IWUSR | S_IRUGO, NULL,
+                               &bw_proc_fops, stats);
+        if (!ent) {
+                printk(KERN_INFO "Unable to initialize bus_watcher /proc entry\n");
+                return;
+        }
+}
+
+#endif /* CONFIG_PROC_FS */
+
+/*
+ * sibyte_bw_int - handle bus watcher interrupts and accumulate counts
+ *
+ * notes: possible re-entry due to multiple sources
+ *        should check/indicate saturation
+ */
+static irqreturn_t sibyte_bw_int(int irq, void *data)
+{
+        struct bw_stats_struct *stats = data;
+        unsigned long cntr;
+#ifdef CONFIG_SIBYTE_BW_TRACE
+        int i;
+#endif
+
+#ifdef CONFIG_SIBYTE_BW_TRACE
+        csr_out32(M_SCD_TRACE_CFG_FREEZE, IOADDR(A_SCD_TRACE_CFG));
+        csr_out32(M_SCD_TRACE_CFG_START_READ, IOADDR(A_SCD_TRACE_CFG));
+
+        for (i=0; i<256*6; i++)
+                printk("%016llx\n",
+                       (long long)__raw_readq(IOADDR(A_SCD_TRACE_READ)));
+
+        csr_out32(M_SCD_TRACE_CFG_RESET, IOADDR(A_SCD_TRACE_CFG));
+        csr_out32(M_SCD_TRACE_CFG_START, IOADDR(A_SCD_TRACE_CFG));
+#endif
+
+        /* Destructive read, clears register and interrupt */
+        stats->status = csr_in32(IOADDR(A_SCD_BUS_ERR_STATUS));
+        stats->status_printed = 0;
+
+        stats->l2_err = cntr = csr_in32(IOADDR(A_BUS_L2_ERRORS));
+        stats->l2_cor_d += G_SCD_L2ECC_CORR_D(cntr);
+        stats->l2_bad_d += G_SCD_L2ECC_BAD_D(cntr);
+        stats->l2_cor_t += G_SCD_L2ECC_CORR_T(cntr);
+        stats->l2_bad_t += G_SCD_L2ECC_BAD_T(cntr);
+        csr_out32(0, IOADDR(A_BUS_L2_ERRORS));
+
+        stats->memio_err = cntr = csr_in32(IOADDR(A_BUS_MEM_IO_ERRORS));
+        stats->mem_cor_d += G_SCD_MEM_ECC_CORR(cntr);
+        stats->mem_bad_d += G_SCD_MEM_ECC_BAD(cntr);
+        stats->bus_error += G_SCD_MEM_BUSERR(cntr);
+        csr_out32(0, IOADDR(A_BUS_MEM_IO_ERRORS));
+
+        return IRQ_HANDLED;
+}
+
+int __init sibyte_bus_watcher(void)
+{
+        memset(&bw_stats, 0, sizeof(struct bw_stats_struct));
+        bw_stats.status_printed = 1;
+
+        if (request_irq(K_INT_BAD_ECC, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) {
+                printk("Failed to register bus watcher BAD_ECC irq\n");
+                return -1;
+        }
+        if (request_irq(K_INT_COR_ECC, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) {
+                free_irq(K_INT_BAD_ECC, &bw_stats);
+                printk("Failed to register bus watcher COR_ECC irq\n");
+                return -1;
+        }
+        if (request_irq(K_INT_IO_BUS, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) {
+                free_irq(K_INT_BAD_ECC, &bw_stats);
+                free_irq(K_INT_COR_ECC, &bw_stats);
+                printk("Failed to register bus watcher IO_BUS irq\n");
+                return -1;
+        }
+
+#ifdef CONFIG_PROC_FS
+        create_proc_decoder(&bw_stats);
+#endif
+
+#ifdef CONFIG_SIBYTE_BW_TRACE
+        csr_out32((M_SCD_TRSEQ_ASAMPLE | M_SCD_TRSEQ_DSAMPLE |
+                   K_SCD_TRSEQ_TRIGGER_ALL),
+                  IOADDR(A_SCD_TRACE_SEQUENCE_0));
+        csr_out32(M_SCD_TRACE_CFG_RESET, IOADDR(A_SCD_TRACE_CFG));
+        csr_out32(M_SCD_TRACE_CFG_START, IOADDR(A_SCD_TRACE_CFG));
+#endif
+
+        return 0;
+}
+
+__initcall(sibyte_bus_watcher);