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228 lines
6.9 KiB
228 lines
6.9 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2002,2003 Broadcom Corporation |
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*/ |
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/* |
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* The Bus Watcher monitors internal bus transactions and maintains |
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* counts of transactions with error status, logging details and |
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* causing one of several interrupts. This driver provides a handler |
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* for those interrupts which aggregates the counts (to avoid |
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* saturating the 8-bit counters) and provides a presence in |
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* /proc/bus_watcher if PROC_FS is on. |
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*/ |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/interrupt.h> |
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#include <linux/sched.h> |
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#include <linux/proc_fs.h> |
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#include <linux/seq_file.h> |
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#include <asm/io.h> |
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#include <asm/sibyte/sb1250.h> |
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#include <asm/sibyte/sb1250_regs.h> |
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#include <asm/sibyte/sb1250_int.h> |
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#include <asm/sibyte/sb1250_scd.h> |
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#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80) |
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#include <asm/sibyte/bcm1480_regs.h> |
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#endif |
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struct bw_stats_struct { |
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uint64_t status; |
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uint32_t l2_err; |
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uint32_t memio_err; |
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int status_printed; |
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unsigned long l2_cor_d; |
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unsigned long l2_bad_d; |
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unsigned long l2_cor_t; |
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unsigned long l2_bad_t; |
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unsigned long mem_cor_d; |
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unsigned long mem_bad_d; |
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unsigned long bus_error; |
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} bw_stats; |
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static void print_summary(uint32_t status, uint32_t l2_err, |
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uint32_t memio_err) |
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{ |
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printk("Bus watcher error counters: %08x %08x\n", l2_err, memio_err); |
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printk("\nLast recorded signature:\n"); |
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printk("Request %02x from %d, answered by %d with Dcode %d\n", |
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(unsigned int)(G_SCD_BERR_TID(status) & 0x3f), |
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(int)(G_SCD_BERR_TID(status) >> 6), |
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(int)G_SCD_BERR_RID(status), |
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(int)G_SCD_BERR_DCODE(status)); |
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} |
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/* |
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* check_bus_watcher is exported for use in situations where we want |
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* to see the most recent status of the bus watcher, which might have |
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* already been destructively read out of the registers. |
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* |
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* notes: this is currently used by the cache error handler |
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* should provide locking against the interrupt handler |
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*/ |
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void check_bus_watcher(void) |
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{ |
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u32 status, l2_err, memio_err; |
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#if defined(CONFIG_SIBYTE_BCM112X) || defined(CONFIG_SIBYTE_SB1250) |
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/* Use non-destructive register */ |
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status = csr_in32(IOADDR(A_SCD_BUS_ERR_STATUS_DEBUG)); |
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#elif defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80) |
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/* Use non-destructive register */ |
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/* Same as 1250 except BUS_ERR_STATUS_DEBUG is in a different place. */ |
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status = csr_in32(IOADDR(A_BCM1480_BUS_ERR_STATUS_DEBUG)); |
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#else |
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#error bus watcher being built for unknown Sibyte SOC! |
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#endif |
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if (!(status & 0x7fffffff)) { |
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printk("Using last values reaped by bus watcher driver\n"); |
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status = bw_stats.status; |
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l2_err = bw_stats.l2_err; |
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memio_err = bw_stats.memio_err; |
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} else { |
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l2_err = csr_in32(IOADDR(A_BUS_L2_ERRORS)); |
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memio_err = csr_in32(IOADDR(A_BUS_MEM_IO_ERRORS)); |
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} |
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if (status & ~(1UL << 31)) |
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print_summary(status, l2_err, memio_err); |
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else |
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printk("Bus watcher indicates no error\n"); |
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} |
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#ifdef CONFIG_PROC_FS |
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/* For simplicity, I want to assume a single read is required each |
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time */ |
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static int bw_proc_show(struct seq_file *m, void *v) |
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{ |
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struct bw_stats_struct *stats = m->private; |
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seq_puts(m, "SiByte Bus Watcher statistics\n"); |
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seq_puts(m, "-----------------------------\n"); |
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seq_printf(m, "L2-d-cor %8ld\nL2-d-bad %8ld\n", |
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stats->l2_cor_d, stats->l2_bad_d); |
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seq_printf(m, "L2-t-cor %8ld\nL2-t-bad %8ld\n", |
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stats->l2_cor_t, stats->l2_bad_t); |
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seq_printf(m, "MC-d-cor %8ld\nMC-d-bad %8ld\n", |
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stats->mem_cor_d, stats->mem_bad_d); |
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seq_printf(m, "IO-err %8ld\n", stats->bus_error); |
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seq_puts(m, "\nLast recorded signature:\n"); |
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seq_printf(m, "Request %02x from %d, answered by %d with Dcode %d\n", |
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(unsigned int)(G_SCD_BERR_TID(stats->status) & 0x3f), |
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(int)(G_SCD_BERR_TID(stats->status) >> 6), |
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(int)G_SCD_BERR_RID(stats->status), |
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(int)G_SCD_BERR_DCODE(stats->status)); |
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/* XXXKW indicate multiple errors between printings, or stats |
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collection (or both)? */ |
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if (stats->status & M_SCD_BERR_MULTERRS) |
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seq_puts(m, "Multiple errors observed since last check.\n"); |
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if (stats->status_printed) { |
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seq_puts(m, "(no change since last printing)\n"); |
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} else { |
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stats->status_printed = 1; |
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} |
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return 0; |
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} |
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static void create_proc_decoder(struct bw_stats_struct *stats) |
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{ |
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struct proc_dir_entry *ent; |
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ent = proc_create_single_data("bus_watcher", S_IWUSR | S_IRUGO, NULL, |
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bw_proc_show, stats); |
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if (!ent) { |
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printk(KERN_INFO "Unable to initialize bus_watcher /proc entry\n"); |
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return; |
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} |
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} |
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#endif /* CONFIG_PROC_FS */ |
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/* |
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* sibyte_bw_int - handle bus watcher interrupts and accumulate counts |
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* |
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* notes: possible re-entry due to multiple sources |
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* should check/indicate saturation |
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*/ |
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static irqreturn_t sibyte_bw_int(int irq, void *data) |
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{ |
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struct bw_stats_struct *stats = data; |
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unsigned long cntr; |
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#ifdef CONFIG_SIBYTE_BW_TRACE |
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int i; |
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#endif |
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#ifdef CONFIG_SIBYTE_BW_TRACE |
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csr_out32(M_SCD_TRACE_CFG_FREEZE, IOADDR(A_SCD_TRACE_CFG)); |
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csr_out32(M_SCD_TRACE_CFG_START_READ, IOADDR(A_SCD_TRACE_CFG)); |
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for (i=0; i<256*6; i++) |
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printk("%016llx\n", |
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(long long)__raw_readq(IOADDR(A_SCD_TRACE_READ))); |
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csr_out32(M_SCD_TRACE_CFG_RESET, IOADDR(A_SCD_TRACE_CFG)); |
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csr_out32(M_SCD_TRACE_CFG_START, IOADDR(A_SCD_TRACE_CFG)); |
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#endif |
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/* Destructive read, clears register and interrupt */ |
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stats->status = csr_in32(IOADDR(A_SCD_BUS_ERR_STATUS)); |
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stats->status_printed = 0; |
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stats->l2_err = cntr = csr_in32(IOADDR(A_BUS_L2_ERRORS)); |
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stats->l2_cor_d += G_SCD_L2ECC_CORR_D(cntr); |
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stats->l2_bad_d += G_SCD_L2ECC_BAD_D(cntr); |
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stats->l2_cor_t += G_SCD_L2ECC_CORR_T(cntr); |
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stats->l2_bad_t += G_SCD_L2ECC_BAD_T(cntr); |
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csr_out32(0, IOADDR(A_BUS_L2_ERRORS)); |
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stats->memio_err = cntr = csr_in32(IOADDR(A_BUS_MEM_IO_ERRORS)); |
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stats->mem_cor_d += G_SCD_MEM_ECC_CORR(cntr); |
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stats->mem_bad_d += G_SCD_MEM_ECC_BAD(cntr); |
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stats->bus_error += G_SCD_MEM_BUSERR(cntr); |
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csr_out32(0, IOADDR(A_BUS_MEM_IO_ERRORS)); |
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return IRQ_HANDLED; |
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} |
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int __init sibyte_bus_watcher(void) |
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{ |
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memset(&bw_stats, 0, sizeof(struct bw_stats_struct)); |
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bw_stats.status_printed = 1; |
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if (request_irq(K_INT_BAD_ECC, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) { |
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printk("Failed to register bus watcher BAD_ECC irq\n"); |
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return -1; |
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} |
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if (request_irq(K_INT_COR_ECC, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) { |
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free_irq(K_INT_BAD_ECC, &bw_stats); |
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printk("Failed to register bus watcher COR_ECC irq\n"); |
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return -1; |
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} |
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if (request_irq(K_INT_IO_BUS, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) { |
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free_irq(K_INT_BAD_ECC, &bw_stats); |
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free_irq(K_INT_COR_ECC, &bw_stats); |
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printk("Failed to register bus watcher IO_BUS irq\n"); |
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return -1; |
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} |
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#ifdef CONFIG_PROC_FS |
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create_proc_decoder(&bw_stats); |
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#endif |
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#ifdef CONFIG_SIBYTE_BW_TRACE |
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csr_out32((M_SCD_TRSEQ_ASAMPLE | M_SCD_TRSEQ_DSAMPLE | |
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K_SCD_TRSEQ_TRIGGER_ALL), |
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IOADDR(A_SCD_TRACE_SEQUENCE_0)); |
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csr_out32(M_SCD_TRACE_CFG_RESET, IOADDR(A_SCD_TRACE_CFG)); |
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csr_out32(M_SCD_TRACE_CFG_START, IOADDR(A_SCD_TRACE_CFG)); |
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#endif |
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return 0; |
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} |
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device_initcall(sibyte_bus_watcher);
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