/************************************************************
* irq.h
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 Gregory Nutt 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.
*
************************************************************/
/* This file should never be included directed but, rather,
* only indirectly through nuttx/irq.h
*/
#ifndef __ARCH_C5471_IRQ_H
#define __ARCH_C5471_IRQ_H
/************************************************************
* Included Files
************************************************************/
/************************************************************
* Definitions
************************************************************/
/* IRQ Stack Frame Format:
*
* Context is always saved/restored in the same way:
*
* (1) stmia rx, {r0-r14}
* (2) then the PC and CPSR
*
* This results in the following set of indices that
* can be used to access individual registers in the
* xcp.regs array:
*/
#define REG_R0 (0)
#define REG_R1 (1)
#define REG_R2 (2)
#define REG_R3 (3)
#define REG_R4 (4)
#define REG_R5 (5
#define REG_R6 (6)
#define REG_R7 (7)
#define REG_R8 (8)
#define REG_R9 (9)
#define REG_R10 (10)
#define REG_R11 (11)
#define REG_R12 (12)
#define REG_R13 (13)
#define REG_R14 (14)
#define REG_R15 (15)
#define REG_CPSR (16)
#define XCPTCONTEST_REGS (17)
#define XCPTCONTEXT_SIZE (4 * XCPTCONTEST_REGS)
#define REG_A1 REG_R0
#define REG_A2 REG_R1
#define REG_A3 REG_R2
#define REG_A4 REG_R3
#define REG_V1 REG_R4
#define REG_V2 REG_R5
#define REG_V3 REG_R6
#define REG_V4 REG_R7
#define REG_V5 REG_R8
#define REG_V6 REG_R9
#define REG_V7 REG_R10
#define REG_SB REG_R9
#define REG_SL REG_R10
#define REG_FP REG_R11
#define REG_IP REG_R12
#define REG_SP REG_R13
#define REG_LR REG_R14
#define REG_PC REG_R15
/* C5471 Interrupts */
#define C5471_IRQ_TIMER0 0
#define C5471_IRQ_TIMER1 1
#define C5471_IRQ_TIMER2 2
#define C5471_IRQ_GPIO0 3
#define C5471_IRQ_ETHER 4
#define C5471_IRQ_KBGPIO_0_7 5
#define C5471_IRQ_UART 6
#define C5471_IRQ_UART_IRDA 7
#define C5471_IRQ_KBGPIO_8_15 8
#define C5471_IRQ_GPIO3 9
#define C5471_IRQ_GPIO2 10
#define C5471_IRQ_I2C 11
#define C5471_IRQ_GPIO1 12
#define C5471_IRQ_SPI 13
#define C5471_IRQ_GPIO_4_19 14
#define C5471_IRQ_API 15
#define C5471_IRQ_WATCHDOG C5471_IRQ_TIMER0
#define C5471_IRQ_SYSTIMER C5471_IRQ_TIMER2
#define NR_IRQS (C5471_IRQ_API+1)
/************************************************************
* Public Types
************************************************************/
/* This struct defines the way the registers are stored. We
* need to save:
*
* 1 CPSR
* 7 Static registers, v1-v7 (aka r4-r10)
* 1 Frame pointer, fp (aka r11)
* 1 Stack pointer, sp (aka r13)
* 1 Return address, lr (aka r14)
* ---
* 11 (XCPTCONTEXT_USER_REG)
*
* On interrupts, we also need to save:
* 4 Volatile registers, a1-a4 (aka r0-r3)
* 1 Scratch Register, ip (aka r12)
*---
* 5 (XCPTCONTEXT_IRQ_REGS)
*
* For a total of 17 (XCPTCONTEST_REGS)
*/
#ifndef __ASSEMBLY__
struct xcptcontext
{
/* The following function pointer is non-zero if there
* are pending signals to be processed.
*/
void *sigdeliver; /* Actual type is sig_deliver_t */
/* These are saved copies of LR and CPSR used during
* signal processing.
*/
uint32 saved_pc;
uint32 saved_cpsr;
/* Register save area */
uint32 regs[XCPTCONTEST_REGS];
};
#endif
/************************************************************
* Inline functions
************************************************************/
#ifndef __ASSEMBLY__
/* Save the current interrupt enable state & disable IRQs */
static inline uint32 irqsave(void)
{
unsigned long flags;
unsigned long temp;
__asm__ __volatile__
(
"\tmrs %0, cpsr\n"
"\torr %1, %0, #128\n"
"\tmsr cpsr_c, %1"
: "=r" (flags), "=r" (temp)
:
: "memory");
return flags;
}
/* Restore saved IRQ & FIQ state */
static inline void irqrestore(uint32 flags)
{
__asm__ __volatile__
(
"msr cpsr_c, %0"
:
: "r" (flags)
: "memory");
}
static inline void system_call(swint_t func, uint32 parm1,
uint32 parm2, uint32 parm3)
{
__asm__ __volatile__
(
"mov\tr0,%0\n\t"
"mov\tr1,%1\n\t"
"mov\tr2,%2\n\t"
"mov\tr2,%3\n\t"
"swi\t0x900001\n\t"
:
: "r" ((long)(func)), "r" ((long)(parm1)),
"r" ((long)(parm2)), "r" ((long)(parm3))
: "r0", "r1", "r2", "r3", "lr");
}
#endif
/************************************************************
* Public Variables
************************************************************/
/************************************************************
* Public Function Prototypes
************************************************************/
#ifndef __ASSEMBLY__
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif
#endif /* __ARCH_C5471_IRQ_H */
