/**************************************************************************** * arch/arm/src/lm3s/lm3s_irq.c * arch/arm/src/chip/lm3s_irq.c * * Copyright (C) 2009 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. 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. * 3. Neither the name NuttX 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 IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include "up_arch.h" #include "os_internal.h" #include "up_internal.h" #include "lm3s_internal.h" /**************************************************************************** * Definitions ****************************************************************************/ #define DEFPRIORITY32 \ (NVIC_SYSH_PRIORITY_DEFAULT << 24 |\ NVIC_SYSH_PRIORITY_DEFAULT << 16 |\ NVIC_SYSH_PRIORITY_DEFAULT << 8 |\ NVIC_SYSH_PRIORITY_DEFAULT) /**************************************************************************** * Public Data ****************************************************************************/ uint32 *current_regs; /**************************************************************************** * Private Data ****************************************************************************/ /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: lml3s_irqinfo * * Description: * Given an IRQ number, provide the register and bit setting to enable or * disable the irq. * ****************************************************************************/ static int lml3s_irqinfo(int irq, uint32 *regaddr, uint32 *bit) { DEBUGASSERT(irq >= LMSB_IRQ_MPU && irq < NR_IRQS); /* Check for external interrupt */ if (irq >= LM3S_IRQ_INTERRUPTS) { if (irq < LM3S_IRQ_INTERRUPTS + 32) { *regaddr = NVIC_IRQ0_31_ENABLE; *bit = 1 << (irq - LM3S_IRQ_INTERRUPTS); } else if (irq < NR_IRQS) { *regaddr = NVIC_IRQ32_63_ENABLE; *bit = 1 << (irq - LM3S_IRQ_INTERRUPTS - 32); } else { return ERROR; /* Invalid interrupt */ } } /* Handler processor exceptions. Only a few can be disabled */ else { *regaddr = NVIC_SYSHCON; if (irq == LMSB_IRQ_MPU) { *bit = NVIC_SYSHCON_MEMFAULTENA; } else if (irq == LMSB_IRQ_BUSFAULT) { *bit = NVIC_SYSHCON_BUSFAULTENA; } else if (irq == LMSB_IRQ_USAGEFAULT) { *bit = NVIC_SYSHCON_USGFAULTENA; } else if (irq == LMSB_IRQ_SYSTICK) { *regaddr = NVIC_SYSTICK_CTRL; *bit = NVIC_SYSTICK_CTRL_ENABLE; } else { return ERROR; /* Invalid or unsupported exception */ } } return OK; } /**************************************************************************** * Public Funtions ****************************************************************************/ /**************************************************************************** * Name: up_irqinitialize ****************************************************************************/ void up_irqinitialize(void) { /* Disable all interrupts */ putreg32(0, NVIC_IRQ0_31_ENABLE); putreg32(0, NVIC_IRQ32_63_ENABLE); /* Set all interrrupts (and exceptions) to the default priority */ putreg32(DEFPRIORITY32, NVIC_IRQ0_3_PRIORITY); putreg32(DEFPRIORITY32, NVIC_IRQ4_7_PRIORITY); putreg32(DEFPRIORITY32, NVIC_IRQ8_11_PRIORITY); putreg32(DEFPRIORITY32, NVIC_IRQ12_15_PRIORITY); putreg32(DEFPRIORITY32, NVIC_IRQ16_19_PRIORITY); putreg32(DEFPRIORITY32, NVIC_IRQ20_23_PRIORITY); putreg32(DEFPRIORITY32, NVIC_IRQ24_27_PRIORITY); putreg32(DEFPRIORITY32, NVIC_IRQ28_31_PRIORITY); putreg32(DEFPRIORITY32, NVIC_IRQ32_35_PRIORITY); putreg32(DEFPRIORITY32, NVIC_IRQ36_39_PRIORITY); putreg32(DEFPRIORITY32, NVIC_IRQ40_43_PRIORITY); putreg32(DEFPRIORITY32, NVIC_IRQ44_47_PRIORITY); putreg32(DEFPRIORITY32, NVIC_IRQ48_51_PRIORITY); putreg32(DEFPRIORITY32, NVIC_IRQ52_55_PRIORITY); putreg32(DEFPRIORITY32, NVIC_IRQ56_59_PRIORITY); putreg32(DEFPRIORITY32, NVIC_IRQ60_63_PRIORITY); /* currents_regs is non-NULL only while processing an interrupt */ current_regs = NULL; /* Attach the PendSV exception handler. This is used for performing * context switches. */ irq_attach(LMSB_IRQ_PENDSV, lm3s_pendsv); /* Attach all processor exceptions (except reset and sys tick) */ #ifdef CONFIG_DEBUG irq_attach(LMSB_IRQ_NMI, lm3s_nmi); irq_attach(LMSB_IRQ_HARDFAULT, lm3s_hardfault); irq_attach(LMSB_IRQ_MPU, lm3s_mpu); irq_attach(LMSB_IRQ_BUSFAULT, lm3s_busfault); irq_attach(LMSB_IRQ_USAGEFAULT, lm3s_usagefault); irq_attach(LMSB_IRQ_SVCALL, lm3s_svcall); irq_attach(LMSB_IRQ_DBGMONITOR, lm3s_dbgmonitor); irq_attach(LMSB_IRQ_RESERVED, lm3s_reserved); #endif #ifndef CONFIG_SUPPRESS_INTERRUPTS /* Initialize FIQs */ #ifdef CONFIG_ARCH_FIQ up_fiqinitialize(); #endif /* And finally, enable interrupts */ irqrestore(0); #endif } /**************************************************************************** * Name: up_disable_irq * * Description: * Disable the IRQ specified by 'irq' * ****************************************************************************/ void up_disable_irq(int irq) { uint32 regaddr; uint32 regval; uint32 bit; if (lml3s_irqinfo(irq, ®addr, &bit) == 0) { /* Clear the appropriate bit in the register to enable the interrupt */ regval = getreg32(regaddr); regval &= ~bit; putreg32(regval, regaddr); } } /**************************************************************************** * Name: up_enable_irq * * Description: * Enable the IRQ specified by 'irq' * ****************************************************************************/ void up_enable_irq(int irq) { uint32 regaddr; uint32 regval; uint32 bit; if (lml3s_irqinfo(irq, ®addr, &bit) == 0) { /* Set the appropriate bit in the register to enable the interrupt */ regval = getreg32(regaddr); regval |= bit; putreg32(regval, regaddr); } } /**************************************************************************** * Name: up_maskack_irq * * Description: * Mask the IRQ and acknowledge it * ****************************************************************************/ void up_maskack_irq(int irq) { up_disable_irq(irq); } /**************************************************************************** * Name: up_prioritize_irq * * Description: * Set the priority of an IRQ. * * Since this API is not supported on all architectures, it should be * avoided in common implementations where possible. * ****************************************************************************/ #ifdef CONFIG_ARCH_IRQPRIO int up_prioritize_irq(int irq, int priority) { uint32 regaddr; uint32 regval; int shift; DEBUGASSERT(irq >= LMSB_IRQ_MPU && irq < NR_IRQS && (unsigned)priority <= NVIC_SYSH_PRIORITY_MAX); if (irq < LM3S_IRQ_INTERRUPTS) { regaddr = NVIC_SYSH_PRIORITY(irq); } else { irq -= LM3S_IRQ_INTERRUPTS; regaddr = NVIC_IRQ_PRIORITY(irq); } regval = getreg32(regaddr); shift = ((irq & 3) << 3); regval &= ~(0xff << shift); regval |= (priority << shift); putreg32(regval, regaddr); return OK; } #endif /**************************************************************************** * Name: lm3s_nmi, lm3s_hardfault, lm3s_mpu, lm3s_busfault, lm3s_usagefault, * lm3s_svcall, lm3s_dbgmonitor, lm3s_pendsv, lm3s_reserved * * Description: * Handlers for various execptions. None are handler and all are fatal * error conditions. * ****************************************************************************/ #ifdef CONFIG_DEBUG int lm3s_nmi(int irq, FAR void *context) { (void)irqsave(); dbg("PANIC!!! NMI received\n"); PANIC(OSERR_UNEXPECTEDISR); return 0; } int lm3s_hardfault(int irq, FAR void *context) { (void)irqsave(); dbg("PANIC!!! Hard fault received\n"); PANIC(OSERR_UNEXPECTEDISR); return 0; } int lm3s_mpu(int irq, FAR void *context) { (void)irqsave(); dbg("PANIC!!! MPU interrupt received\n"); PANIC(OSERR_UNEXPECTEDISR); return 0; } int lm3s_busfault(int irq, FAR void *context) { (void)irqsave(); dbg("PANIC!!! Bus fault recived\n"); PANIC(OSERR_UNEXPECTEDISR); return 0; } int lm3s_usagefault(int irq, FAR void *context) { (void)irqsave(); dbg("PANIC!!! Usage fault received\n"); PANIC(OSERR_UNEXPECTEDISR); return 0; } int lm3s_svcall(int irq, FAR void *context) { (void)irqsave(); dbg("PANIC!!! SVCALL received\n"); PANIC(OSERR_UNEXPECTEDISR); return 0; } int lm3s_dbgmonitor(int irq, FAR void *context) { (void)irqsave(); dbg("PANIC!!! Debug Monitor receieved\n"); PANIC(OSERR_UNEXPECTEDISR); return 0; } int lm3s_reserved(int irq, FAR void *context) { (void)irqsave(); dbg("PANIC!!! Reserved interrupt\n"); PANIC(OSERR_UNEXPECTEDISR); return 0; } #endif