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/*
* Copyright (c) 2008 Carsten Schlote <c.schlote@konzeptpark.de>
* See file CREDITS for list of people who contributed to this project.
*
* This file is part of U-Boot V2.
*
* U-Boot V2 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 3 of the License, or
* (at your option) any later version.
*
* U-Boot V2 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with U-Boot V2. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file
* Interrupt routines and supporting code for Coldfire V4E
*/
#include <common.h>
#include <asm/ptrace.h>
#include <mach/mcf54xx-regs.h>
#ifdef CONFIG_USE_IRQ
void enable_interrupts(void)
{
asm_set_ipl(0);
}
int disable_interrupts(void)
{
return asm_set_ipl(7) ? 1 : 0;
}
#endif
/**
*/
static void mcf_bad_mode (void)
{
panic ("Resetting CPU ...\n");
mdelay(3000);
reset_cpu (0);
}
/**
*/
static void mcf_show_regs (struct pt_regs *regs)
{
unsigned long flags;
flags = condition_codes (regs);
printf ("pc : [<%08lx>]\n"
"sp : %08lx fp : %08lx\n",
instruction_pointer (regs),
regs->M68K_sp, regs->M68K_a6);
printf ("d0-d3 : %08lx %08lx %08lx %08lx\n",
regs->M68K_d0, regs->M68K_d1, regs->M68K_d2, regs->M68K_d3);
printf ("d3-d7 : %08lx %08lx %08lx %08lx\n",
regs->M68K_d3, regs->M68K_d4, regs->M68K_d5, regs->M68K_d6);
printf ("a0-d3 : %08lx %08lx %08lx %08lx\n",
regs->M68K_a0, regs->M68K_a1, regs->M68K_a2, regs->M68K_a3);
printf ("a3-d7 : %08lx %08lx %08lx %08lx\n",
regs->M68K_a3, regs->M68K_a4, regs->M68K_a5, regs->M68K_a6);
printf ("fp0 : %08lx%08lx fp1 : %08lx%08lx\n",
regs->M68K_fp0+1, regs->M68K_fp0, regs->M68K_fp1+1, regs->M68K_fp1);
printf ("fp2 : %08lx%08lx fp3 : %08lx%08lx\n",
regs->M68K_fp2+1, regs->M68K_fp2, regs->M68K_fp3+1, regs->M68K_fp3);
printf ("fp4 : %08lx%08lx fp5 : %08lx%08lx\n",
regs->M68K_fp4+1, regs->M68K_fp4, regs->M68K_fp5+1, regs->M68K_fp5);
printf ("fp6 : %08lx%08lx fp7 : %08lx%08lx\n",
regs->M68K_fp6+1, regs->M68K_fp6, regs->M68K_fp7+1, regs->M68K_fp7);
printf ("Flags: %c%c%c%c",
flags & CC_X_BIT ? 'X' : 'x',
flags & CC_N_BIT ? 'N' : 'n',
flags & CC_Z_BIT ? 'Z' : 'z',
flags & CC_V_BIT ? 'V' : 'v',
flags & CC_C_BIT ? 'C' : 'c' );
printf (" IRQs %s (%0x) Mode %s\n",
interrupts_enabled (regs) ? "on" : "off", interrupts_enabled (regs),
user_mode (regs) ? "user" : "supervisor");
}
void mcf_execute_exception_handler (struct pt_regs *pt_regs)
{
printf ("unhandled exception\n");
mcf_show_regs (pt_regs);
mcf_bad_mode ();
}
#ifndef CONFIG_USE_IRQ
void mcf_execute_irq_handler (struct pt_regs *pt_regs, int vector)
{
printf ("interrupt request\n");
mcf_show_regs (pt_regs);
mcf_bad_mode ();
}
#else
#ifndef CONFIG_MAX_ISR_HANDLERS
#define CONFIG_MAX_ISR_HANDLERS (20)
#endif
typedef struct
{
int vector;
int (*handler)(void *, void *);
void *hdev;
void *harg;
}
mcfv4e_irq_handler_s;
mcfv4e_irq_handler_s irq_handler_table[CONFIG_MAX_ISR_HANDLERS];
/** Initialize an empty interrupt handler list
*/
void mcf_interrupts_initialize (void)
{
int index;
for (index = 0; index < CONFIG_MAX_ISR_HANDLERS; index++)
{
irq_handler_table[index].vector = 0;
irq_handler_table[index].handler = 0;
irq_handler_table[index].hdev = 0;
irq_handler_table[index].harg = 0;
}
}
/** Add an interrupt handler to the handler list
*
* @param vector : M68k exception/interrupt vector number
* @param handler : Pointer to handler function
* @param hdev : Handler specific data
* @param harg : Handler specific arg
*/
int mcf_interrupts_register_handler(
int vector,
int (*handler)(void *, void *), void *hdev, void *harg)
{
/*
* This function places an interrupt handler in the ISR table,
* thereby registering it so that the low-level handler may call it.
*
* The two parameters are intended for the first arg to be a
* pointer to the device itself, and the second a pointer to a data
* structure used by the device driver for that particular device.
*/
int index;
if ((vector == 0) || (handler == NULL))
{
return 0;
}
for (index = 0; index < CONFIG_MAX_ISR_HANDLERS; index++)
{
if (irq_handler_table[index].vector == vector)
{
/* only one entry of each type per vector */
return 0;
}
if (irq_handler_table[index].vector == 0)
{
irq_handler_table[index].vector = vector;
irq_handler_table[index].handler = handler;
irq_handler_table[index].hdev = hdev;
irq_handler_table[index].harg = harg;
return 1;
}
}
return 0; /* no available slots */
}
/** Remove an interrupt handler from the handler list
*
* @param type : FIXME
* @param handler : Pointer of handler function to remove.
*/
void mcf_interrupts_remove_handler (int type ,int (*handler)(void *, void *))
{
/*
* This routine removes from the ISR table all
* entries that matches 'handler'.
*/
int index;
for (index = 0; index < CONFIG_MAX_ISR_HANDLERS; index++)
{
if (irq_handler_table[index].handler == handler)
{
irq_handler_table[index].vector = 0;
irq_handler_table[index].handler = 0;
irq_handler_table[index].hdev = 0;
irq_handler_table[index].harg = 0;
}
}
}
/** Traverse list of registered interrupts and call matching handlers.
*
* @param pt_regs : Pointer to saved register context
* @param vector : M68k exception/interrupt vector number
*/
int mcf_execute_irq_handler (struct pt_regs *pt_regs, int vector)
{
/*
* This routine searches the ISR table for an entry that matches
* 'vector'. If one is found, then 'handler' is executed.
*/
int index, retval = 0;
/*
* Try to locate a user-registered Interrupt Service Routine handler.
*/
for (index = 0; index < CONFIG_MAX_ISR_HANDLERS; index++)
{
if (irq_handler_table[index].handler == NULL)
{
printf("\nFault: No handler for IRQ vector %ld found.\n", vector);
break;
}
if (irq_handler_table[index].vector == vector)
{
if (irq_handler_table[index].handler(irq_handler_table[index].hdev,irq_handler_table[index].harg))
{
retval = 1;
break;
}
}
}
return retval;
}
#endif
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