/**************************************************************************** * arch/arm/src/lm3s/lm3s_irq.c * arch/arm/src/chip/lm3s_irq.c * * Copyright (C) 2009, 2011 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 #include #include #include "nvic.h" #include "up_arch.h" #include "os_internal.h" #include "up_internal.h" #include "lm3s_internal.h" /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* Enable NVIC debug features that are probably only desireable during * bringup */ #undef LM3S_IRQ_DEBUG /* Get a 32-bit version of the default priority */ #define DEFPRIORITY32 \ (NVIC_SYSH_PRIORITY_DEFAULT << 24 |\ NVIC_SYSH_PRIORITY_DEFAULT << 16 |\ NVIC_SYSH_PRIORITY_DEFAULT << 8 |\ NVIC_SYSH_PRIORITY_DEFAULT) /**************************************************************************** * Public Data ****************************************************************************/ volatile uint32_t *current_regs; /**************************************************************************** * Private Data ****************************************************************************/ /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: lm3s_dumpnvic * * Description: * Dump some interesting NVIC registers * ****************************************************************************/ #if defined(LM3S_IRQ_DEBUG) && defined (CONFIG_DEBUG) static void lm3s_dumpnvic(const char *msg, int irq) { irqstate_t flags; flags = irqsave(); slldbg("NVIC (%s, irq=%d):\n", msg, irq); slldbg(" INTCTRL: %08x VECTAB: %08x\n", getreg32(NVIC_INTCTRL), getreg32(NVIC_VECTAB)); #if 0 slldbg(" SYSH ENABLE MEMFAULT: %08x BUSFAULT: %08x USGFAULT: %08x SYSTICK: %08x\n", getreg32(NVIC_SYSHCON_MEMFAULTENA), getreg32(NVIC_SYSHCON_BUSFAULTENA), getreg32(NVIC_SYSHCON_USGFAULTENA), getreg32(NVIC_SYSTICK_CTRL_ENABLE)); #endif slldbg(" IRQ ENABLE: %08x %08x\n", getreg32(NVIC_IRQ0_31_ENABLE), getreg32(NVIC_IRQ32_63_ENABLE)); slldbg(" SYSH_PRIO: %08x %08x %08x\n", getreg32(NVIC_SYSH4_7_PRIORITY), getreg32(NVIC_SYSH8_11_PRIORITY), getreg32(NVIC_SYSH12_15_PRIORITY)); slldbg(" IRQ PRIO: %08x %08x %08x %08x\n", getreg32(NVIC_IRQ0_3_PRIORITY), getreg32(NVIC_IRQ4_7_PRIORITY), getreg32(NVIC_IRQ8_11_PRIORITY), getreg32(NVIC_IRQ12_15_PRIORITY)); slldbg(" %08x %08x %08x %08x\n", getreg32(NVIC_IRQ16_19_PRIORITY), getreg32(NVIC_IRQ20_23_PRIORITY), getreg32(NVIC_IRQ24_27_PRIORITY), getreg32(NVIC_IRQ28_31_PRIORITY)); slldbg(" %08x %08x %08x %08x\n", getreg32(NVIC_IRQ32_35_PRIORITY), getreg32(NVIC_IRQ36_39_PRIORITY), getreg32(NVIC_IRQ40_43_PRIORITY), getreg32(NVIC_IRQ44_47_PRIORITY)); irqrestore(flags); } #else # define lm3s_dumpnvic(msg, irq) #endif /**************************************************************************** * Name: lm3s_nmi, lm3s_busfault, lm3s_usagefault, lm3s_pendsv, * lm3s_dbgmonitor, lm3s_pendsv, lm3s_reserved * * Description: * Handlers for various execptions. None are handled and all are fatal * error conditions. The only advantage these provided over the default * unexpected interrupt handler is that they provide a diagnostic output. * ****************************************************************************/ #ifdef CONFIG_DEBUG static int lm3s_nmi(int irq, FAR void *context) { (void)irqsave(); dbg("PANIC!!! NMI received\n"); PANIC(OSERR_UNEXPECTEDISR); return 0; } static int lm3s_busfault(int irq, FAR void *context) { (void)irqsave(); dbg("PANIC!!! Bus fault recived\n"); PANIC(OSERR_UNEXPECTEDISR); return 0; } static int lm3s_usagefault(int irq, FAR void *context) { (void)irqsave(); dbg("PANIC!!! Usage fault received\n"); PANIC(OSERR_UNEXPECTEDISR); return 0; } static int lm3s_pendsv(int irq, FAR void *context) { (void)irqsave(); dbg("PANIC!!! PendSV received\n"); PANIC(OSERR_UNEXPECTEDISR); return 0; } static int lm3s_dbgmonitor(int irq, FAR void *context) { (void)irqsave(); dbg("PANIC!!! Debug Monitor receieved\n"); PANIC(OSERR_UNEXPECTEDISR); return 0; } static int lm3s_reserved(int irq, FAR void *context) { (void)irqsave(); dbg("PANIC!!! Reserved interrupt\n"); PANIC(OSERR_UNEXPECTEDISR); return 0; } #endif /**************************************************************************** * Name: lm3s_irqinfo * * Description: * Given an IRQ number, provide the register and bit setting to enable or * disable the irq. * ****************************************************************************/ static int lm3s_irqinfo(int irq, uint32_t *regaddr, uint32_t *bit) { DEBUGASSERT(irq >= LM3S_IRQ_NMI && 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 == LM3S_IRQ_MEMFAULT) { *bit = NVIC_SYSHCON_MEMFAULTENA; } else if (irq == LM3S_IRQ_BUSFAULT) { *bit = NVIC_SYSHCON_BUSFAULTENA; } else if (irq == LM3S_IRQ_USAGEFAULT) { *bit = NVIC_SYSHCON_USGFAULTENA; } else if (irq == LM3S_IRQ_SYSTICK) { *regaddr = NVIC_SYSTICK_CTRL; *bit = NVIC_SYSTICK_CTRL_ENABLE; } else { return ERROR; /* Invalid or unsupported exception */ } } return OK; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * 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_SYSH4_7_PRIORITY); putreg32(DEFPRIORITY32, NVIC_SYSH8_11_PRIORITY); putreg32(DEFPRIORITY32, NVIC_SYSH12_15_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); /* currents_regs is non-NULL only while processing an interrupt */ current_regs = NULL; /* Initialize support for GPIO interrupts if included in this build */ #ifndef CONFIG_LM3S_DISABLE_GPIO_IRQS #ifdef CONFIG_HAVE_WEAKFUNCTIONS if (gpio_irqinitialize != NULL) #endif { gpio_irqinitialize(); } #endif /* Attach the SVCall and Hard Fault exception handlers. The SVCall * exception is used for performing context switches; The Hard Fault * must also be caught because a SVCall may show up as a Hard Fault * under certain conditions. */ irq_attach(LM3S_IRQ_SVCALL, up_svcall); irq_attach(LM3S_IRQ_HARDFAULT, up_hardfault); /* Set the priority of the SVCall interrupt */ #ifdef CONFIG_ARCH_IRQPRIO /* up_prioritize_irq(LM3S_IRQ_PENDSV, NVIC_SYSH_PRIORITY_MIN); */ #endif /* If the MPU is enabled, then attach and enable the Memory Management * Fault handler. */ #ifdef CONFIG_ARMV7M_MPU irq_attach(LM3S_IRQ_MEMFAULT, up_memfault); up_enable_irq(LM3S_IRQ_MEMFAULT); #endif /* Attach all other processor exceptions (except reset and sys tick) */ #ifdef CONFIG_DEBUG irq_attach(LM3S_IRQ_NMI, lm3s_nmi); #ifndef CONFIG_ARMV7M_MPU irq_attach(LM3S_IRQ_MEMFAULT, up_memfault); #endif irq_attach(LM3S_IRQ_BUSFAULT, lm3s_busfault); irq_attach(LM3S_IRQ_USAGEFAULT, lm3s_usagefault); irq_attach(LM3S_IRQ_PENDSV, lm3s_pendsv); irq_attach(LM3S_IRQ_DBGMONITOR, lm3s_dbgmonitor); irq_attach(LM3S_IRQ_RESERVED, lm3s_reserved); #endif lm3s_dumpnvic("initial", NR_IRQS); #ifndef CONFIG_SUPPRESS_INTERRUPTS /* And finally, enable interrupts */ setbasepri(NVIC_SYSH_PRIORITY_MAX); irqrestore(0); #endif } /**************************************************************************** * Name: up_disable_irq * * Description: * Disable the IRQ specified by 'irq' * ****************************************************************************/ void up_disable_irq(int irq) { uint32_t regaddr; uint32_t regval; uint32_t bit; if (lm3s_irqinfo(irq, ®addr, &bit) == 0) { /* Clear the appropriate bit in the register to enable the interrupt */ regval = getreg32(regaddr); regval &= ~bit; putreg32(regval, regaddr); } lm3s_dumpnvic("disable", irq); } /**************************************************************************** * Name: up_enable_irq * * Description: * Enable the IRQ specified by 'irq' * ****************************************************************************/ void up_enable_irq(int irq) { uint32_t regaddr; uint32_t regval; uint32_t bit; if (lm3s_irqinfo(irq, ®addr, &bit) == 0) { /* Set the appropriate bit in the register to enable the interrupt */ regval = getreg32(regaddr); regval |= bit; putreg32(regval, regaddr); } lm3s_dumpnvic("enable", irq); } /**************************************************************************** * 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_t regaddr; uint32_t regval; int shift; DEBUGASSERT(irq >= LM3S_IRQ_MEMFAULT && irq < NR_IRQS && (unsigned)priority <= NVIC_SYSH_PRIORITY_MIN); if (irq < LM3S_IRQ_INTERRUPTS) { irq -= 4; 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); lm3s_dumpnvic("prioritize", irq); return OK; } #endif