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/***********************license start***************
* Copyright (c) 2003-2010 Cavium Networks (support@cavium.com). All rights
* reserved.
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of Cavium Networks nor the names of
* its contributors may be used to endorse or promote products
* derived from this software without specific prior written
* permission.
* This Software, including technical data, may be subject to U.S. export control
* laws, including the U.S. Export Administration Act and its associated
* regulations, and may be subject to export or import regulations in other
* countries.
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
* AND WITH ALL FAULTS AND CAVIUM NETWORKS MAKES NO PROMISES, REPRESENTATIONS OR
* WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH RESPECT TO
* THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY REPRESENTATION OR
* DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT DEFECTS, AND CAVIUM
* SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES OF TITLE,
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* CORRESPONDENCE TO DESCRIPTION. THE ENTIRE RISK ARISING OUT OF USE OR
* PERFORMANCE OF THE SOFTWARE LIES WITH YOU.
***********************license end**************************************/
/**
* @file
*
* Interface to the Mips interrupts.
*
* <hr>$Revision: 52004 $<hr>
*/
#ifndef __U_BOOT__
#if __GNUC__ >= 4
/* Backtrace is only available with the new toolchain. */
#include <execinfo.h>
#endif
#endif /* __U_BOOT__ */
#include "cvmx-config.h"
#include "cvmx.h"
#include "cvmx-interrupt.h"
#include "cvmx-sysinfo.h"
#include "cvmx-uart.h"
#include "cvmx-pow.h"
#include "cvmx-ebt3000.h"
#include "cvmx-coremask.h"
#include "cvmx-spinlock.h"
#include "cvmx-app-init.h"
#include "cvmx-error.h"
#include "../../bootloader/u-boot/include/octeon_mem_map.h"
EXTERN_ASM void cvmx_interrupt_stage1(void);
EXTERN_ASM void cvmx_debug_handler_stage1(void);
EXTERN_ASM void cvmx_interrupt_cache_error(void);
int cvmx_interrupt_in_isr = 0;
/**
* Internal status the interrupt registration
*/
typedef struct
{
cvmx_interrupt_func_t handlers[256]; /**< One function to call per interrupt */
void * data[256]; /**< User data per interrupt */
cvmx_interrupt_exception_t exception_handler;
} cvmx_interrupt_state_t;
/**
* Internal state the interrupt registration
*/
#ifndef __U_BOOT__
static CVMX_SHARED cvmx_interrupt_state_t cvmx_interrupt_state;
static CVMX_SHARED cvmx_spinlock_t cvmx_interrupt_default_lock;
#endif /* __U_BOOT__ */
#define ULL unsigned long long
#define HI32(data64) ((uint32_t)(data64 >> 32))
#define LO32(data64) ((uint32_t)(data64 & 0xFFFFFFFF))
static const char reg_names[][32] = { "r0","at","v0","v1","a0","a1","a2","a3",
"t0","t1","t2","t3","t4","t5","t6","t7",
"s0","s1","s2","s3","s4","s5", "s6","s7",
"t8","t9", "k0","k1","gp","sp","s8","ra" };
/**
* version of printf that works better in exception context.
*
* @param format
*/
void cvmx_safe_printf(const char *format, ...)
{
char buffer[256];
char *ptr = buffer;
int count;
va_list args;
va_start(args, format);
#ifndef __U_BOOT__
count = vsnprintf(buffer, sizeof(buffer), format, args);
#else
count = vsprintf(buffer, format, args);
#endif
va_end(args);
while (count-- > 0)
{
cvmx_uart_lsr_t lsrval;
/* Spin until there is room */
do
{
lsrval.u64 = cvmx_read_csr(CVMX_MIO_UARTX_LSR(0));
#if !defined(CONFIG_OCTEON_SIM_SPEED)
if (lsrval.s.temt == 0)
cvmx_wait(10000); /* Just to reduce the load on the system */
#endif
}
while (lsrval.s.temt == 0);
if (*ptr == '\n')
cvmx_write_csr(CVMX_MIO_UARTX_THR(0), '\r');
cvmx_write_csr(CVMX_MIO_UARTX_THR(0), *ptr++);
}
}
/* Textual descriptions of cause codes */
static const char cause_names[][128] = {
/* 0 */ "Interrupt",
/* 1 */ "TLB modification",
/* 2 */ "tlb load/fetch",
/* 3 */ "tlb store",
/* 4 */ "address exc, load/fetch",
/* 5 */ "address exc, store",
/* 6 */ "bus error, instruction fetch",
/* 7 */ "bus error, load/store",
/* 8 */ "syscall",
/* 9 */ "breakpoint",
/* 10 */ "reserved instruction",
/* 11 */ "cop unusable",
/* 12 */ "arithmetic overflow",
/* 13 */ "trap",
/* 14 */ "",
/* 15 */ "floating point exc",
/* 16 */ "",
/* 17 */ "",
/* 18 */ "cop2 exception",
/* 19 */ "",
/* 20 */ "",
/* 21 */ "",
/* 22 */ "mdmx unusable",
/* 23 */ "watch",
/* 24 */ "machine check",
/* 25 */ "",
/* 26 */ "",
/* 27 */ "",
/* 28 */ "",
/* 29 */ "",
/* 30 */ "cache error",
/* 31 */ ""
};
/**
* @INTERNAL
* print_reg64
* @param name Name of the value to print
* @param reg Value to print
*/
static inline void print_reg64(const char *name, uint64_t reg)
{
cvmx_safe_printf("%16s: 0x%08x%08x\n", name, (unsigned int)HI32(reg),(unsigned int)LO32(reg));
}
/**
* @INTERNAL
* Dump all useful registers to the console
*
* @param registers CPU register to dump
*/
static void __cvmx_interrupt_dump_registers(uint64_t registers[32])
{
uint64_t r1, r2;
int reg;
for (reg=0; reg<16; reg++)
{
r1 = registers[reg]; r2 = registers[reg+16];
cvmx_safe_printf("%3s ($%02d): 0x%08x%08x \t %3s ($%02d): 0x%08x%08x\n",
reg_names[reg], reg, (unsigned int)HI32(r1), (unsigned int)LO32(r1),
reg_names[reg+16], reg+16, (unsigned int)HI32(r2), (unsigned int)LO32(r2));
}
CVMX_MF_COP0 (r1, COP0_CAUSE);
print_reg64 ("COP0_CAUSE", r1);
CVMX_MF_COP0 (r2, COP0_STATUS);
print_reg64 ("COP0_STATUS", r2);
CVMX_MF_COP0 (r1, COP0_BADVADDR);
print_reg64 ("COP0_BADVADDR", r1);
CVMX_MF_COP0 (r2, COP0_EPC);
print_reg64 ("COP0_EPC", r2);
}
/**
* @INTERNAL
* Default exception handler. Prints out the exception
* cause decode and all relevant registers.
*
* @param registers Registers at time of the exception
*/
#ifndef __U_BOOT__
static
#endif /* __U_BOOT__ */
void __cvmx_interrupt_default_exception_handler(uint64_t registers[32])
{
uint64_t trap_print_cause;
const char *str;
#ifndef __U_BOOT__
ebt3000_str_write("Trap");
cvmx_spinlock_lock(&cvmx_interrupt_default_lock);
#endif
CVMX_MF_COP0 (trap_print_cause, COP0_CAUSE);
str = cause_names [(trap_print_cause >> 2) & 0x1f];
cvmx_safe_printf("Core %d: Unhandled Exception. Cause register decodes to:\n%s\n", (int)cvmx_get_core_num(), str && *str ? str : "Reserved exception cause");
cvmx_safe_printf("******************************************************************\n");
__cvmx_interrupt_dump_registers(registers);
#ifndef __U_BOOT__
cvmx_safe_printf("******************************************************************\n");
#if __GNUC__ >= 4 && !defined(OCTEON_DISABLE_BACKTRACE)
cvmx_safe_printf("Backtrace:\n\n");
__octeon_print_backtrace_func ((__octeon_backtrace_printf_t)cvmx_safe_printf);
cvmx_safe_printf("******************************************************************\n");
#endif
cvmx_spinlock_unlock(&cvmx_interrupt_default_lock);
if (cvmx_sysinfo_get()->board_type == CVMX_BOARD_TYPE_SIM)
CVMX_BREAK;
while (1)
{
/* Interrupts are suppressed when we are in the exception
handler (because of SR[EXL]). Spin and poll the uart
status and see if the debugger is trying to stop us. */
cvmx_uart_lsr_t lsrval;
lsrval.u64 = cvmx_read_csr(CVMX_MIO_UARTX_LSR(cvmx_debug_uart));
if (lsrval.s.dr)
{
uint64_t tmp;
/* Pulse the MCD0 signal. */
asm volatile (
".set push\n"
".set noreorder\n"
".set mips64\n"
"dmfc0 %0, $22\n"
"ori %0, %0, 0x10\n"
"dmtc0 %0, $22\n"
".set pop\n"
: "=r" (tmp));
}
}
#endif /* __U_BOOT__ */
}
#ifndef __U_BOOT__
/**
* @INTERNAL
* Default interrupt handler if the user doesn't register one.
*
* @param irq_number IRQ that caused this interrupt
* @param registers Register at the time of the interrupt
* @param user_arg Unused optional user data
*/
static void __cvmx_interrupt_default(int irq_number, uint64_t registers[32], void *user_arg)
{
cvmx_safe_printf("cvmx_interrupt_default: Received interrupt %d\n", irq_number);
__cvmx_interrupt_dump_registers(registers);
}
/**
* @INTERNAL
* Handler for interrupt lines 2 and 3. These are directly tied
* to the CIU. The handler queres the status of the CIU and
* calls the secondary handler for the CIU interrupt that
* occurred.
*
* @param irq_number Interrupt number that fired (2 or 3)
* @param registers Registers at the time of the interrupt
* @param user_arg Unused user argument
*/
static void __cvmx_interrupt_ciu(int irq_number, uint64_t registers[32], void *user_arg)
{
int ciu_offset = cvmx_get_core_num() * 2 + irq_number - 2;
uint64_t irq_mask = cvmx_read_csr(CVMX_CIU_INTX_SUM0(ciu_offset)) & cvmx_read_csr(CVMX_CIU_INTX_EN0(ciu_offset));
int irq = 8;
/* Handle EN0 sources */
while (irq_mask)
{
if (irq_mask&1)
{
cvmx_interrupt_state.handlers[irq](irq, registers, cvmx_interrupt_state.data[irq]);
return;
}
irq_mask = irq_mask >> 1;
irq++;
}
/* Handle EN1 sources */
irq_mask = cvmx_read_csr(CVMX_CIU_INT_SUM1) & cvmx_read_csr(CVMX_CIU_INTX_EN1(ciu_offset));
irq = 8 + 64;
while (irq_mask)
{
if (irq_mask&1)
{
cvmx_interrupt_state.handlers[irq](irq, registers, cvmx_interrupt_state.data[irq]);
return;
}
irq_mask = irq_mask >> 1;
irq++;
}
}
/**
* @INTERNAL
* Called for all RML interrupts. This is usually an ECC error
*
* @param irq_number Interrupt number that we're being called for
* @param registers Registers at the time of the interrupt
* @param user_arg Unused user argument
*/
static void __cvmx_interrupt_ecc(int irq_number, uint64_t registers[32], void *user_arg)
{
cvmx_error_poll();
}
/**
* Process an interrupt request
*
* @param registers Registers at time of interrupt / exception
* Registers 0-31 are standard MIPS, others specific to this routine
* @return
*/
EXTERN_ASM void cvmx_interrupt_do_irq(uint64_t registers[35]);
void cvmx_interrupt_do_irq(uint64_t registers[35])
{
uint64_t mask;
uint64_t cause;
uint64_t status;
uint64_t cache_err;
int i;
uint32_t exc_vec;
/* Determine the cause of the interrupt */
asm volatile ("dmfc0 %0,$13,0" : "=r" (cause));
asm volatile ("dmfc0 %0,$12,0" : "=r" (status));
/* In case of exception, clear all interrupts to avoid recursive interrupts.
Also clear EXL bit to display the correct PC value. */
if ((cause & 0x7c) == 0)
{
asm volatile ("dmtc0 %0, $12, 0" : : "r" (status & ~(0xff02)));
}
/* The assembly stub at each exception vector saves its address in k1 when
** it calls the stage 2 handler. We use this to compute the exception vector
** that brought us here */
exc_vec = (uint32_t)(registers[27] & 0x780); /* Mask off bits we need to ignore */
/* Check for cache errors. The cache errors go to a separate exception vector,
** so we will only check these if we got here from a cache error exception, and
** the ERL (error level) bit is set. */
if (exc_vec == 0x100 && (status & 0x4))
{
i = cvmx_get_core_num();
CVMX_MF_CACHE_ERR(cache_err);
/* Use copy of DCACHE_ERR register that early exception stub read */
if (registers[34] & 0x1)
{
cvmx_safe_printf("Dcache error detected: core: %d, set: %d, va 6:3: 0x%x\n", i, (int)(cache_err >> 3) & 0x3, (int)(cache_err >> 3) & 0xf);
uint64_t dcache_err = 0;
CVMX_MT_DCACHE_ERR(dcache_err);
}
else if (cache_err & 0x1)
{
cvmx_safe_printf("Icache error detected: core: %d, set: %d, way : %d\n", i, (int)(cache_err >> 5) & 0x3f, (int)(cache_err >> 7) & 0x3);
cache_err = 0;
CVMX_MT_CACHE_ERR(cache_err);
}
else
cvmx_safe_printf("Cache error exception: core %d\n", i);
}
if ((cause & 0x7c) != 0)
{
cvmx_interrupt_state.exception_handler(registers);
goto return_from_interrupt;
}
/* Convert the cause into an active mask */
mask = ((cause & status) >> 8) & 0xff;
if (mask == 0)
{
goto return_from_interrupt; /* Spurious interrupt */
}
for (i=0; i<8; i++)
{
if (mask & (1<<i))
{
cvmx_interrupt_state.handlers[i](i, registers, cvmx_interrupt_state.data[i]);
goto return_from_interrupt;
}
}
/* We should never get here */
__cvmx_interrupt_default_exception_handler(registers);
return_from_interrupt:
/* Restore Status register before returning from exception. */
asm volatile ("dmtc0 %0, $12, 0" : : "r" (status));
}
/**
* Initialize the interrupt routine and copy the low level
* stub into the correct interrupt vector. This is called
* automatically during application startup.
*/
void cvmx_interrupt_initialize(void)
{
void *low_level_loc;
cvmx_sysinfo_t *sys_info_ptr = cvmx_sysinfo_get();
int i;
/* Disable all CIU interrupts by default */
cvmx_write_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num()*2), 0);
cvmx_write_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num()*2+1), 0);
cvmx_write_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num()*2), 0);
cvmx_write_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num()*2+1), 0);
if (cvmx_coremask_first_core(sys_info_ptr->core_mask))
{
cvmx_interrupt_state.exception_handler = __cvmx_interrupt_default_exception_handler;
for (i=0; i<256; i++)
{
cvmx_interrupt_state.handlers[i] = __cvmx_interrupt_default;
cvmx_interrupt_state.data[i] = NULL;
}
low_level_loc = CASTPTR(void, CVMX_ADD_SEG32(CVMX_MIPS32_SPACE_KSEG0,sys_info_ptr->exception_base_addr));
memcpy(low_level_loc + 0x80, (void*)cvmx_interrupt_stage1, 0x80);
memcpy(low_level_loc + 0x100, (void*)cvmx_interrupt_cache_error, 0x80);
memcpy(low_level_loc + 0x180, (void*)cvmx_interrupt_stage1, 0x80);
memcpy(low_level_loc + 0x200, (void*)cvmx_interrupt_stage1, 0x80);
/* Make sure the locations used to count Icache and Dcache exceptions
starts out as zero */
cvmx_write64_uint64(CVMX_ADD_SEG32(CVMX_MIPS32_SPACE_KSEG0, 8), 0);
cvmx_write64_uint64(CVMX_ADD_SEG32(CVMX_MIPS32_SPACE_KSEG0, 16), 0);
cvmx_write64_uint64(CVMX_ADD_SEG32(CVMX_MIPS32_SPACE_KSEG0, 24), 0);
CVMX_SYNC;
/* Add an interrupt handlers for chained CIU interrupts */
cvmx_interrupt_register(CVMX_IRQ_CIU0, __cvmx_interrupt_ciu, NULL);
cvmx_interrupt_register(CVMX_IRQ_CIU1, __cvmx_interrupt_ciu, NULL);
/* Add an interrupt handler for ECC failures */
cvmx_interrupt_register(CVMX_IRQ_RML, __cvmx_interrupt_ecc, NULL);
if (cvmx_error_initialize(0 /* || CVMX_ERROR_FLAGS_ECC_SINGLE_BIT */))
cvmx_warn("cvmx_error_initialize() failed\n");
cvmx_interrupt_unmask_irq(CVMX_IRQ_RML);
}
cvmx_interrupt_unmask_irq(CVMX_IRQ_CIU0);
cvmx_interrupt_unmask_irq(CVMX_IRQ_CIU1);
CVMX_ICACHE_INVALIDATE;
/* Enable interrupts for each core (bit0 of COP0 Status) */
uint32_t mask;
asm volatile (
"mfc0 %0,$12,0\n"
"ori %0, %0, 1\n"
"mtc0 %0,$12,0\n"
: "=r" (mask));
}
/**
* Register an interrupt handler for the specified interrupt number.
*
* @param irq_number Interrupt number to register for (0-135) See
* cvmx-interrupt.h for enumeration and description of sources.
* @param func Function to call on interrupt.
* @param user_arg User data to pass to the interrupt handler
*/
void cvmx_interrupt_register(cvmx_irq_t irq_number, cvmx_interrupt_func_t func, void *user_arg)
{
cvmx_interrupt_state.handlers[irq_number] = func;
cvmx_interrupt_state.data[irq_number] = user_arg;
CVMX_SYNCWS;
}
/**
* Set the exception handler for all non interrupt sources.
*
* @param handler New exception handler
* @return Old exception handler
*/
cvmx_interrupt_exception_t cvmx_interrupt_set_exception(cvmx_interrupt_exception_t handler)
{
cvmx_interrupt_exception_t result = cvmx_interrupt_state.exception_handler;
cvmx_interrupt_state.exception_handler = handler;
CVMX_SYNCWS;
return result;
}
#endif /* !__U_BOOT__ */