Initial revision
wdenk
parent
217c9dad82
commit
0de1ffc8be
|
|
@ -0,0 +1,354 @@
|
|||
/*
|
||||
* (C) Copyright 2000-2002
|
||||
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
|
||||
*
|
||||
* See file CREDITS for list of people who contributed to this
|
||||
* project.
|
||||
*
|
||||
* 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 program 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 this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
||||
* MA 02111-1307 USA
|
||||
*/
|
||||
|
||||
#include <common.h>
|
||||
#include <watchdog.h>
|
||||
#include <mpc8xx.h>
|
||||
#include <mpc8xx_irq.h>
|
||||
#include <asm/processor.h>
|
||||
#include <commproc.h>
|
||||
|
||||
/****************************************************************************/
|
||||
|
||||
unsigned decrementer_count; /* count value for 1e6/HZ microseconds */
|
||||
|
||||
/****************************************************************************/
|
||||
|
||||
/*
|
||||
* CPM interrupt vector functions.
|
||||
*/
|
||||
struct cpm_action {
|
||||
interrupt_handler_t *handler;
|
||||
void *arg;
|
||||
};
|
||||
|
||||
static struct cpm_action cpm_vecs[CPMVEC_NR];
|
||||
|
||||
static void cpm_interrupt_init (void);
|
||||
static void cpm_interrupt(int irq, struct pt_regs * regs);
|
||||
|
||||
/****************************************************************************/
|
||||
|
||||
static __inline__ unsigned long get_msr(void)
|
||||
{
|
||||
unsigned long msr;
|
||||
|
||||
asm volatile("mfmsr %0" : "=r" (msr) :);
|
||||
return msr;
|
||||
}
|
||||
|
||||
static __inline__ void set_msr(unsigned long msr)
|
||||
{
|
||||
asm volatile("mtmsr %0" : : "r" (msr));
|
||||
}
|
||||
|
||||
static __inline__ unsigned long get_dec(void)
|
||||
{
|
||||
unsigned long val;
|
||||
|
||||
asm volatile("mfdec %0" : "=r" (val) :);
|
||||
return val;
|
||||
}
|
||||
|
||||
|
||||
static __inline__ void set_dec(unsigned long val)
|
||||
{
|
||||
asm volatile("mtdec %0" : : "r" (val));
|
||||
}
|
||||
|
||||
|
||||
void enable_interrupts (void)
|
||||
{
|
||||
set_msr (get_msr() | MSR_EE);
|
||||
}
|
||||
|
||||
/* returns flag if MSR_EE was set before */
|
||||
int disable_interrupts (void)
|
||||
{
|
||||
ulong msr = get_msr();
|
||||
set_msr (msr & ~MSR_EE);
|
||||
return ((msr & MSR_EE) != 0);
|
||||
}
|
||||
|
||||
/****************************************************************************/
|
||||
|
||||
int interrupt_init(void)
|
||||
{
|
||||
volatile immap_t *immr = (immap_t *)CFG_IMMR;
|
||||
|
||||
decrementer_count = get_tbclk() / CFG_HZ;
|
||||
|
||||
cpm_interrupt_init();
|
||||
|
||||
/* disable all interrupts except for the CPM interrupt */
|
||||
immr->im_siu_conf.sc_simask = 1 << (31-CPM_INTERRUPT);
|
||||
|
||||
set_dec (decrementer_count);
|
||||
|
||||
set_msr (get_msr() | MSR_EE);
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
/****************************************************************************/
|
||||
|
||||
/*
|
||||
* Handle external interrupts
|
||||
*/
|
||||
void external_interrupt(struct pt_regs *regs)
|
||||
{
|
||||
volatile immap_t *immr = (immap_t *)CFG_IMMR;
|
||||
int irq;
|
||||
ulong simask, newmask;
|
||||
ulong vec, v_bit;
|
||||
|
||||
/*
|
||||
* read the SIVEC register and shift the bits down
|
||||
* to get the irq number
|
||||
*/
|
||||
vec = immr->im_siu_conf.sc_sivec;
|
||||
irq = vec >> 26;
|
||||
v_bit = 0x80000000UL >> irq;
|
||||
|
||||
/*
|
||||
* Read Interrupt Mask Register and Mask Interrupts
|
||||
*/
|
||||
simask = immr->im_siu_conf.sc_simask;
|
||||
newmask = simask & (~(0xFFFF0000 >> irq));
|
||||
immr->im_siu_conf.sc_simask = newmask;
|
||||
|
||||
if (!(irq & 0x1)) { /* External Interrupt ? */
|
||||
ulong siel;
|
||||
/*
|
||||
* Read Interrupt Edge/Level Register
|
||||
*/
|
||||
siel = immr->im_siu_conf.sc_siel;
|
||||
|
||||
if (siel & v_bit) { /* edge triggered interrupt ? */
|
||||
/*
|
||||
* Rewrite SIPEND Register to clear interrupt
|
||||
*/
|
||||
immr->im_siu_conf.sc_sipend = v_bit;
|
||||
}
|
||||
}
|
||||
|
||||
switch (irq) {
|
||||
case CPM_INTERRUPT:
|
||||
cpm_interrupt (irq, regs);
|
||||
break;
|
||||
default:
|
||||
printf ("\nBogus External Interrupt IRQ %d Vector %ld\n",
|
||||
irq, vec);
|
||||
/* turn off the bogus interrupt to avoid it from now */
|
||||
simask &= ~v_bit;
|
||||
break;
|
||||
}
|
||||
|
||||
/*
|
||||
* Re-Enable old Interrupt Mask
|
||||
*/
|
||||
immr->im_siu_conf.sc_simask = simask;
|
||||
}
|
||||
|
||||
/****************************************************************************/
|
||||
|
||||
/*
|
||||
* CPM interrupt handler
|
||||
*/
|
||||
static void
|
||||
cpm_interrupt(int irq, struct pt_regs * regs)
|
||||
{
|
||||
volatile immap_t *immr = (immap_t *)CFG_IMMR;
|
||||
uint vec;
|
||||
|
||||
/*
|
||||
* Get the vector by setting the ACK bit
|
||||
* and then reading the register.
|
||||
*/
|
||||
immr->im_cpic.cpic_civr = 1;
|
||||
vec = immr->im_cpic.cpic_civr;
|
||||
vec >>= 11;
|
||||
|
||||
if (cpm_vecs[vec].handler != NULL) {
|
||||
(*cpm_vecs[vec].handler)(cpm_vecs[vec].arg);
|
||||
} else {
|
||||
immr->im_cpic.cpic_cimr &= ~(1 << vec);
|
||||
printf ("Masking bogus CPM interrupt vector 0x%x\n", vec);
|
||||
}
|
||||
/*
|
||||
* After servicing the interrupt, we have to remove the status indicator.
|
||||
*/
|
||||
immr->im_cpic.cpic_cisr |= (1 << vec);
|
||||
}
|
||||
|
||||
/*
|
||||
* The CPM can generate the error interrupt when there is a race
|
||||
* condition between generating and masking interrupts. All we have
|
||||
* to do is ACK it and return. This is a no-op function so we don't
|
||||
* need any special tests in the interrupt handler.
|
||||
*/
|
||||
static void
|
||||
cpm_error_interrupt (void *dummy)
|
||||
{
|
||||
}
|
||||
|
||||
/****************************************************************************/
|
||||
|
||||
/*
|
||||
* Install and free a CPM interrupt handler.
|
||||
*/
|
||||
|
||||
void
|
||||
irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
|
||||
{
|
||||
volatile immap_t *immr = (immap_t *)CFG_IMMR;
|
||||
|
||||
if (cpm_vecs[vec].handler != NULL) {
|
||||
printf ("CPM interrupt 0x%x replacing 0x%x\n",
|
||||
(uint)handler, (uint)cpm_vecs[vec].handler);
|
||||
}
|
||||
cpm_vecs[vec].handler = handler;
|
||||
cpm_vecs[vec].arg = arg;
|
||||
immr->im_cpic.cpic_cimr |= (1 << vec);
|
||||
#if 0
|
||||
printf ("Install CPM interrupt for vector %d ==> %p\n", vec, handler);
|
||||
#endif
|
||||
}
|
||||
|
||||
void
|
||||
irq_free_handler(int vec)
|
||||
{
|
||||
volatile immap_t *immr = (immap_t *)CFG_IMMR;
|
||||
#if 0
|
||||
printf ("Free CPM interrupt for vector %d ==> %p\n",
|
||||
vec, cpm_vecs[vec].handler);
|
||||
#endif
|
||||
immr->im_cpic.cpic_cimr &= ~(1 << vec);
|
||||
cpm_vecs[vec].handler = NULL;
|
||||
cpm_vecs[vec].arg = NULL;
|
||||
}
|
||||
|
||||
/****************************************************************************/
|
||||
|
||||
static void
|
||||
cpm_interrupt_init (void)
|
||||
{
|
||||
volatile immap_t *immr = (immap_t *)CFG_IMMR;
|
||||
|
||||
/*
|
||||
* Initialize the CPM interrupt controller.
|
||||
*/
|
||||
|
||||
immr->im_cpic.cpic_cicr =
|
||||
( CICR_SCD_SCC4 |
|
||||
CICR_SCC_SCC3 |
|
||||
CICR_SCB_SCC2 |
|
||||
CICR_SCA_SCC1 ) | ((CPM_INTERRUPT/2) << 13) | CICR_HP_MASK;
|
||||
|
||||
immr->im_cpic.cpic_cimr = 0;
|
||||
|
||||
/*
|
||||
* Install the error handler.
|
||||
*/
|
||||
irq_install_handler(CPMVEC_ERROR, cpm_error_interrupt, NULL);
|
||||
|
||||
immr->im_cpic.cpic_cicr |= CICR_IEN;
|
||||
}
|
||||
|
||||
/****************************************************************************/
|
||||
|
||||
volatile ulong timestamp = 0;
|
||||
|
||||
/*
|
||||
* timer_interrupt - gets called when the decrementer overflows,
|
||||
* with interrupts disabled.
|
||||
* Trivial implementation - no need to be really accurate.
|
||||
*/
|
||||
void timer_interrupt(struct pt_regs *regs)
|
||||
{
|
||||
volatile immap_t *immr = (immap_t *)CFG_IMMR;
|
||||
#ifdef CONFIG_STATUS_LED
|
||||
extern void status_led_tick (ulong);
|
||||
#endif
|
||||
#if 0
|
||||
printf ("*** Timer Interrupt *** ");
|
||||
#endif
|
||||
/* Reset Timer Expired and Timers Interrupt Status */
|
||||
immr->im_clkrstk.cark_plprcrk = KAPWR_KEY;
|
||||
__asm__("nop");
|
||||
immr->im_clkrst.car_plprcr |= PLPRCR_TEXPS | PLPRCR_TMIST;
|
||||
/* Restore Decrementer Count */
|
||||
set_dec (decrementer_count);
|
||||
|
||||
timestamp++;
|
||||
|
||||
#ifdef CONFIG_STATUS_LED
|
||||
status_led_tick (timestamp);
|
||||
#endif /* CONFIG_STATUS_LED */
|
||||
|
||||
#if defined(CONFIG_WATCHDOG) || defined(CFG_CMA_LCD_HEARTBEAT)
|
||||
|
||||
|
||||
/*
|
||||
* The shortest watchdog period of all boards (except LWMON)
|
||||
* is approx. 1 sec, thus re-trigger watchdog at least
|
||||
* every 500 ms = CFG_HZ / 2
|
||||
*/
|
||||
#ifndef CONFIG_LWMON
|
||||
if ((timestamp % (CFG_HZ / 2)) == 0) {
|
||||
#else
|
||||
if ((timestamp % (CFG_HZ / 20)) == 0) {
|
||||
#endif
|
||||
|
||||
#if defined(CFG_CMA_LCD_HEARTBEAT)
|
||||
extern void lcd_heartbeat(void);
|
||||
lcd_heartbeat();
|
||||
#endif /* CFG_CMA_LCD_HEARTBEAT */
|
||||
|
||||
#if defined(CONFIG_WATCHDOG)
|
||||
reset_8xx_watchdog(immr);
|
||||
#endif /* CONFIG_WATCHDOG */
|
||||
|
||||
}
|
||||
|
||||
#endif /* CONFIG_WATCHDOG || CFG_CMA_LCD_HEARTBEAT */
|
||||
}
|
||||
|
||||
/****************************************************************************/
|
||||
|
||||
void reset_timer (void)
|
||||
{
|
||||
timestamp = 0;
|
||||
}
|
||||
|
||||
ulong get_timer (ulong base)
|
||||
{
|
||||
return (timestamp - base);
|
||||
}
|
||||
|
||||
void set_timer (ulong t)
|
||||
{
|
||||
timestamp = t;
|
||||
}
|
||||
|
||||
/****************************************************************************/
|
||||
Loading…
Reference in New Issue