u-boot/cpu/mpc8xx/interrupts.c

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/*
* (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 <mpc8xx.h>
#include <mpc8xx_irq.h>
#include <asm/processor.h>
#include <commproc.h>
/************************************************************************/
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/*
* CPM interrupt vector functions.
*/
struct interrupt_action {
interrupt_handler_t *handler;
void *arg;
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};
static struct interrupt_action cpm_vecs[CPMVEC_NR];
static struct interrupt_action irq_vecs[NR_IRQS];
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static void cpm_interrupt_init (void);
static void cpm_interrupt (void *regs);
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/************************************************************************/
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int interrupt_init_cpu (unsigned *decrementer_count)
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{
volatile immap_t *immr = (immap_t *) CFG_IMMR;
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*decrementer_count = get_tbclk () / CFG_HZ;
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/* disable all interrupts */
immr->im_siu_conf.sc_simask = 0;
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/* Configure CPM interrupts */
cpm_interrupt_init ();
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return (0);
}
/************************************************************************/
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/*
* Handle external interrupts
*/
void external_interrupt (struct pt_regs *regs)
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{
volatile immap_t *immr = (immap_t *) CFG_IMMR;
int irq;
ulong simask, newmask;
ulong vec, v_bit;
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/*
* 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 ? */
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ulong siel;
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/*
* Read Interrupt Edge/Level Register
*/
siel = immr->im_siu_conf.sc_siel;
if (siel & v_bit) { /* edge triggered interrupt ? */
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/*
* Rewrite SIPEND Register to clear interrupt
*/
immr->im_siu_conf.sc_sipend = v_bit;
}
}
if (irq_vecs[irq].handler != NULL) {
irq_vecs[irq].handler (irq_vecs[irq].arg);
} else {
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printf ("\nBogus External Interrupt IRQ %d Vector %ld\n",
irq, vec);
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/* turn off the bogus interrupt to avoid it from now */
simask &= ~v_bit;
}
/*
* Re-Enable old Interrupt Mask
*/
immr->im_siu_conf.sc_simask = simask;
}
/************************************************************************/
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/*
* CPM interrupt handler
*/
static void cpm_interrupt (void *regs)
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{
volatile immap_t *immr = (immap_t *) CFG_IMMR;
uint vec;
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/*
* 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);
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} 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.
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*/
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)
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{
}
/************************************************************************/
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/*
* Install and free an interrupt handler
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*/
void irq_install_handler (int vec, interrupt_handler_t * handler,
void *arg)
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{
volatile immap_t *immr = (immap_t *) CFG_IMMR;
if ((vec & CPMVEC_OFFSET) != 0) {
/* CPM interrupt */
vec &= 0xffff;
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
} else {
/* SIU interrupt */
if (irq_vecs[vec].handler != NULL) {
printf ("SIU interrupt %d 0x%x replacing 0x%x\n",
vec,
(uint) handler,
(uint) cpm_vecs[vec].handler);
}
irq_vecs[vec].handler = handler;
irq_vecs[vec].arg = arg;
immr->im_siu_conf.sc_simask |= 1 << (31 - vec);
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#if 0
printf ("Install SIU interrupt for vector %d ==> %p\n",
vec, handler);
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#endif
}
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}
void irq_free_handler (int vec)
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{
volatile immap_t *immr = (immap_t *) CFG_IMMR;
if ((vec & CPMVEC_OFFSET) != 0) {
/* CPM interrupt */
vec &= 0xffff;
#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;
} else {
/* SIU interrupt */
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#if 0
printf ("Free CPM interrupt for vector %d ==> %p\n",
vec, cpm_vecs[vec].handler);
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#endif
immr->im_siu_conf.sc_simask &= ~(1 << (31 - vec));
irq_vecs[vec].handler = NULL;
irq_vecs[vec].arg = NULL;
}
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}
/************************************************************************/
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static void cpm_interrupt_init (void)
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{
volatile immap_t *immr = (immap_t *) CFG_IMMR;
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/*
* 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;
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immr->im_cpic.cpic_cimr = 0;
/*
* Install the error handler.
*/
irq_install_handler (CPMVEC_ERROR, cpm_error_interrupt, NULL);
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immr->im_cpic.cpic_cicr |= CICR_IEN;
/*
* Install the cpm interrupt handler
*/
irq_install_handler (CPM_INTERRUPT, cpm_interrupt, NULL);
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}
/************************************************************************/
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/*
* timer_interrupt - gets called when the decrementer overflows,
* with interrupts disabled.
* Trivial implementation - no need to be really accurate.
*/
void timer_interrupt_cpu (struct pt_regs *regs)
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{
volatile immap_t *immr = (immap_t *) CFG_IMMR;
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#if 0
printf ("*** Timer Interrupt *** ");
#endif
/* Reset Timer Expired and Timers Interrupt Status */
immr->im_clkrstk.cark_plprcrk = KAPWR_KEY;
__asm__ ("nop");
/*
Clear TEXPS (and TMIST on older chips). SPLSS (on older
chips) is cleared too.
Bitwise OR is a read-modify-write operation so ALL bits
which are cleared by writing `1' would be cleared by
operations like
immr->im_clkrst.car_plprcr |= PLPRCR_TEXPS;
The same can be achieved by simple writing of the PLPRCR
to itself. If a bit value should be preserved, read the
register, ZERO the bit and write, not OR, the result back.
*/
immr->im_clkrst.car_plprcr = immr->im_clkrst.car_plprcr;
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}
/************************************************************************/