/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 *
 * Copyright (C) 2002 by Alan Korr
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/
#ifndef SYSTEM_ARM_CLASSIC_H
#define SYSTEM_ARM_CLASSIC_H

#define IRQ_ENABLED      0x00
#define IRQ_DISABLED     0x80
#define IRQ_STATUS       0x80
#define FIQ_ENABLED      0x00
#define FIQ_DISABLED     0x40
#define FIQ_STATUS       0x40
#define IRQ_FIQ_ENABLED  0x00
#define IRQ_FIQ_DISABLED 0xc0
#define IRQ_FIQ_STATUS   0xc0
#define HIGHEST_IRQ_LEVEL IRQ_DISABLED

#define set_irq_level(status) \
    set_interrupt_status((status), IRQ_STATUS)
#define set_fiq_status(status) \
    set_interrupt_status((status), FIQ_STATUS)

#define disable_irq_save() \
    disable_interrupt_save(IRQ_STATUS)
#define disable_fiq_save() \
    disable_interrupt_save(FIQ_STATUS)

#define restore_irq(cpsr) \
    restore_interrupt(cpsr)
#define restore_fiq(cpsr) \
    restore_interrupt(cpsr)

#define disable_irq() \
    disable_interrupt(IRQ_STATUS)
#define enable_irq() \
    enable_interrupt(IRQ_STATUS)
#define disable_fiq() \
    disable_interrupt(FIQ_STATUS)
#define enable_fiq() \
    enable_interrupt(FIQ_STATUS)

#define irq_enabled() \
    interrupt_enabled(IRQ_STATUS)
#define fiq_enabled() \
    interrupt_enabled(FIQ_STATUS)
#define ints_enabled() \
    interrupt_enabled(IRQ_FIQ_STATUS)

#define irq_enabled_checkval(val) \
    (((val) & IRQ_STATUS) == 0)
#define fiq_enabled_checkval(val) \
    (((val) & FIQ_STATUS) == 0)
#define ints_enabled_checkval(val) \
    (((val) & IRQ_FIQ_STATUS) == 0)

#define CPU_MODE_USER   0x10
#define CPU_MODE_FIQ    0x11
#define CPU_MODE_IRQ    0x12
#define CPU_MODE_SVC    0x13
#define CPU_MODE_ABT    0x17
#define CPU_MODE_UNDEF  0x1b
#define CPU_MODE_SYS    0x1f

/* We run in SYS mode */
#define CPU_MODE_THREAD_CONTEXT CPU_MODE_SYS

#define is_thread_context() \
    (get_processor_mode() == CPU_MODE_THREAD_CONTEXT)

/* Assert that the processor is in the desired execution mode
 * mode:       Processor mode value to test for
 * rstatus...: Provide if you already have the value saved, otherwise leave
 *             blank to get it automatically.
 */
#define ASSERT_CPU_MODE(mode, rstatus...) \
    ({ unsigned long __massert = (mode);                         \
       unsigned long __mproc = *#rstatus ?                       \
            ((rstatus +0) & 0x1f) : get_processor_mode();        \
       if (__mproc != __massert)                                 \
           panicf("Incorrect CPU mode in %s (0x%02lx!=0x%02lx)", \
                  __func__, __mproc, __massert); })

/* Core-level interrupt masking */

static inline int set_interrupt_status(int status, int mask)
{
    unsigned long cpsr;
    int oldstatus;
    /* Read the old levels and set the new ones */
    asm volatile (
        "mrs    %1, cpsr        \n"
        "bic    %0, %1, %[mask] \n"
        "orr    %0, %0, %2      \n"
        "msr    cpsr_c, %0      \n"
        : "=&r,r"(cpsr), "=&r,r"(oldstatus)
        : "r,i"(status & mask), [mask]"i,i"(mask));
    return oldstatus;
}

static inline void restore_interrupt(int cpsr)
{
    /* Set cpsr_c from value returned by disable_interrupt_save
     * or set_interrupt_status */
    asm volatile ("msr cpsr_c, %0" : : "r"(cpsr));
}

static inline bool interrupt_enabled(int status)
{
    unsigned long cpsr;
    asm ("mrs %0, cpsr" : "=r"(cpsr));
    return (cpsr & status) == 0;
}

static inline unsigned long get_processor_mode(void)
{
    unsigned long cpsr;
    asm ("mrs %0, cpsr" : "=r"(cpsr));
    return cpsr & 0x1f;
}

/* ARM_ARCH version section for architecture*/

#if ARM_ARCH >= 6
static inline void enable_interrupt(int mask)
{
    /* Clear I and/or F disable bit */
    /* mask is expected to be constant and so only relevent branch
     * is preserved */
    switch (mask & IRQ_FIQ_STATUS)
    {
    case IRQ_STATUS:
        asm volatile ("cpsie i");
        break;
    case FIQ_STATUS:
        asm volatile ("cpsie f");
        break;
    case IRQ_FIQ_STATUS:
        asm volatile ("cpsie if");
        break;
    }
}

static inline void disable_interrupt(int mask)
{
    /* Set I and/or F disable bit */
    /* mask is expected to be constant and so only relevent branch
     * is preserved */
    switch (mask & IRQ_FIQ_STATUS)
    {
    case IRQ_STATUS:
        asm volatile ("cpsid i");
        break;
    case FIQ_STATUS:
        asm volatile ("cpsid f");
        break;
    case IRQ_FIQ_STATUS:
        asm volatile ("cpsid if");
        break;
    }
}

static inline int disable_interrupt_save(int mask)
{
    /* Set I and/or F disable bit and return old cpsr value */
    int cpsr;
    /* mask is expected to be constant and so only relevent branch
     * is preserved */
    asm volatile("mrs %0, cpsr" : "=r"(cpsr));
    switch (mask & IRQ_FIQ_STATUS)
    {
    case IRQ_STATUS:
        asm volatile ("cpsid i");
        break;
    case FIQ_STATUS:
        asm volatile ("cpsid f");
        break;
    case IRQ_FIQ_STATUS:
        asm volatile ("cpsid if");
        break;
    }
    return cpsr;
}

#else /* ARM_ARCH < 6 */

static inline void enable_interrupt(int mask)
{
    /* Clear I and/or F disable bit */
    int tmp;
    asm volatile (
        "mrs     %0, cpsr   \n"
        "bic     %0, %0, %1 \n"
        "msr     cpsr_c, %0 \n"
        : "=&r"(tmp) : "i"(mask));
}

static inline void disable_interrupt(int mask)
{
    /* Set I and/or F disable bit */
    int tmp;
    asm volatile (
        "mrs     %0, cpsr   \n"
        "orr     %0, %0, %1 \n"
        "msr     cpsr_c, %0 \n"
        : "=&r"(tmp) : "i"(mask));
}

static inline int disable_interrupt_save(int mask)
{
    /* Set I and/or F disable bit and return old cpsr value */
    int cpsr, tmp;
    asm volatile (
        "mrs     %1, cpsr   \n"
        "orr     %0, %1, %2 \n"
        "msr     cpsr_c, %0 \n"
        : "=&r"(tmp), "=&r"(cpsr)
        : "i"(mask));
    return cpsr;
}

#endif /* ARM_ARCH */

#if defined(CPU_TCC780X) /* Single core only for now */ \
|| CONFIG_CPU == IMX31L || CONFIG_CPU == DM320 || CONFIG_CPU == AS3525 \
|| CONFIG_CPU == S3C2440 || CONFIG_CPU == S5L8701 || CONFIG_CPU == AS3525v2 \
|| CONFIG_CPU == S5L8702 || CONFIG_CPU == S5L8720
/* Use the generic ARMv4/v5/v6 wait for IRQ */
static inline void core_sleep(void)
{
    asm volatile (
        "mcr p15, 0, %0, c7, c0, 4 \n" /* Wait for interrupt */
#if CONFIG_CPU == IMX31L
        "nop\n nop\n nop\n nop\n nop\n" /* Clean out the pipes */
#endif
        : : "r"(0)
    );
    enable_irq();
}
#else
/* Skip this if special code is required and implemented */
#if !(defined(CPU_PP)) && CONFIG_CPU != RK27XX && CONFIG_CPU != IMX233
static inline void core_sleep(void)
{
    /* TODO: core_sleep not implemented, battery life will be decreased */
    enable_irq();
}
#endif /* CPU_PP */
#endif

#endif /* SYSTEM_ARM_CLASSIC_H */