u-boot/cpu/ppc4xx/interrupts.c

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/*
* (C) Copyright 2000-2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* (C) Copyright 2002 (440 port)
* Scott McNutt, Artesyn Communication Producs, smcnutt@artsyncp.com
*
* (C) Copyright 2003 (440GX port)
* Travis B. Sawyer, Sandburst Corporation, tsawyer@sandburst.com
*
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* 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 <command.h>
#include <asm/processor.h>
#include <ppc4xx.h>
#include <ppc_asm.tmpl>
#include <commproc.h>
#include <asm/ppc4xx-intvec.h>
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DECLARE_GLOBAL_DATA_PTR;
/*
* Define the number of UIC's
*/
#if defined(CONFIG_440SPE) || \
defined(CONFIG_460EX) || defined(CONFIG_460GT)
#define UIC_MAX 4
#elif defined(CONFIG_440GX) || \
defined(CONFIG_440EPX) || defined(CONFIG_440GRX) || \
defined(CONFIG_405EX)
#define UIC_MAX 3
#elif defined(CONFIG_440GP) || defined(CONFIG_440SP) || \
defined(CONFIG_440EP) || defined(CONFIG_440GR)
#define UIC_MAX 2
#else
#define UIC_MAX 1
#endif
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/*
* CPM interrupt vector functions.
*/
struct irq_action {
interrupt_handler_t *handler;
void *arg;
int count;
};
static struct irq_action irq_vecs[UIC_MAX * 32];
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u32 get_dcr(u16);
void set_dcr(u16, u32);
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#if (UIC_MAX > 1) && !defined(CONFIG_440GX)
static void uic_cascade_interrupt(void *para);
#endif
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#if defined(CONFIG_440)
/* SPRN changed in 440 */
static __inline__ void set_evpr(unsigned long val)
{
asm volatile("mtspr 0x03f,%0" : : "r" (val));
}
#else /* !defined(CONFIG_440) */
static __inline__ void set_pit(unsigned long val)
{
asm volatile("mtpit %0" : : "r" (val));
}
static __inline__ void set_tcr(unsigned long val)
{
asm volatile("mttcr %0" : : "r" (val));
}
static __inline__ void set_evpr(unsigned long val)
{
asm volatile("mtevpr %0" : : "r" (val));
}
#endif /* defined(CONFIG_440 */
int interrupt_init_cpu (unsigned *decrementer_count)
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{
int vec;
unsigned long val;
/* decrementer is automatically reloaded */
*decrementer_count = 0;
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/*
* Mark all irqs as free
*/
for (vec = 0; vec < (UIC_MAX * 32); vec++) {
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irq_vecs[vec].handler = NULL;
irq_vecs[vec].arg = NULL;
irq_vecs[vec].count = 0;
}
#ifdef CONFIG_4xx
/*
* Init PIT
*/
#if defined(CONFIG_440)
val = mfspr( tcr );
val &= (~0x04400000); /* clear DIS & ARE */
mtspr( tcr, val );
mtspr( dec, 0 ); /* Prevent exception after TSR clear*/
mtspr( decar, 0 ); /* clear reload */
mtspr( tsr, 0x08000000 ); /* clear DEC status */
val = gd->bd->bi_intfreq/1000; /* 1 msec */
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mtspr( decar, val ); /* Set auto-reload value */
mtspr( dec, val ); /* Set inital val */
#else
set_pit(gd->bd->bi_intfreq / 1000);
#endif
#endif /* CONFIG_4xx */
#ifdef CONFIG_ADCIOP
/*
* Init PIT
*/
set_pit(66000);
#endif
/*
* Enable PIT
*/
val = mfspr(tcr);
val |= 0x04400000;
mtspr(tcr, val);
/*
* Set EVPR to 0
*/
set_evpr(0x00000000);
#if !defined(CONFIG_440GX)
#if (UIC_MAX > 1)
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/* Install the UIC1 handlers */
irq_install_handler(VECNUM_UIC1NC, uic_cascade_interrupt, 0);
irq_install_handler(VECNUM_UIC1C, uic_cascade_interrupt, 0);
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#endif
#if (UIC_MAX > 2)
irq_install_handler(VECNUM_UIC2NC, uic_cascade_interrupt, 0);
irq_install_handler(VECNUM_UIC2C, uic_cascade_interrupt, 0);
#endif
#if (UIC_MAX > 3)
irq_install_handler(VECNUM_UIC3NC, uic_cascade_interrupt, 0);
irq_install_handler(VECNUM_UIC3C, uic_cascade_interrupt, 0);
#endif
#else /* !defined(CONFIG_440GX) */
/* Take the GX out of compatibility mode
* Travis Sawyer, 9 Mar 2004
* NOTE: 440gx user manual inconsistency here
* Compatibility mode and Ethernet Clock select are not
* correct in the manual
*/
mfsdr(sdr_mfr, val);
val &= ~0x10000000;
mtsdr(sdr_mfr,val);
/* Enable UIC interrupts via UIC Base Enable Register */
mtdcr(uicb0sr, UICB0_ALL);
mtdcr(uicb0er, 0x54000000);
/* None are critical */
mtdcr(uicb0cr, 0);
#endif /* !defined(CONFIG_440GX) */
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return (0);
}
/* Handler for UIC interrupt */
static void uic_interrupt(u32 uic_base, int vec_base)
{
u32 uic_msr;
u32 msr_shift;
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int vec;
/*
* Read masked interrupt status register to determine interrupt source
*/
uic_msr = get_dcr(uic_base + UIC_MSR);
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msr_shift = uic_msr;
vec = vec_base;
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while (msr_shift != 0) {
if (msr_shift & 0x80000000) {
/*
* Increment irq counter (for debug purpose only)
*/
irq_vecs[vec].count++;
if (irq_vecs[vec].handler != NULL) {
/* call isr */
(*irq_vecs[vec].handler)(irq_vecs[vec].arg);
} else {
set_dcr(uic_base + UIC_ER,
get_dcr(uic_base + UIC_ER) &
~(0x80000000 >> (vec & 0x1f)));
printf("Masking bogus interrupt vector %d"
" (UIC_BASE=0x%x)\n", vec, uic_base);
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}
/*
* After servicing the interrupt, we have to remove the
* status indicator
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*/
set_dcr(uic_base + UIC_SR, (0x80000000 >> (vec & 0x1f)));
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}
/*
* Shift msr to next position and increment vector
*/
msr_shift <<= 1;
vec++;
}
}
#if (UIC_MAX > 1) && !defined(CONFIG_440GX)
static void uic_cascade_interrupt(void *para)
{
external_interrupt(para);
}
#endif
#if defined(CONFIG_440)
#if defined(CONFIG_440GX)
/* 440GX uses base uic register */
#define UIC_BMSR uicb0msr
#define UIC_BSR uicb0sr
#else
#define UIC_BMSR uic0msr
#define UIC_BSR uic0sr
#endif
#else /* CONFIG_440 */
#define UIC_BMSR uicmsr
#define UIC_BSR uicsr
#endif /* CONFIG_440 */
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/*
* Handle external interrupts
*/
void external_interrupt(struct pt_regs *regs)
{
u32 uic_msr;
/*
* Read masked interrupt status register to determine interrupt source
*/
uic_msr = mfdcr(UIC_BMSR);
#if (UIC_MAX > 1)
if ((UICB0_UIC1CI & uic_msr) || (UICB0_UIC1NCI & uic_msr))
uic_interrupt(UIC1_DCR_BASE, 32);
#endif
#if (UIC_MAX > 2)
if ((UICB0_UIC2CI & uic_msr) || (UICB0_UIC2NCI & uic_msr))
uic_interrupt(UIC2_DCR_BASE, 64);
#endif
#if (UIC_MAX > 3)
if ((UICB0_UIC3CI & uic_msr) || (UICB0_UIC3NCI & uic_msr))
uic_interrupt(UIC3_DCR_BASE, 96);
#endif
#if defined(CONFIG_440)
#if !defined(CONFIG_440GX)
if (uic_msr & ~(UICB0_ALL))
uic_interrupt(UIC0_DCR_BASE, 0);
#else
if ((UICB0_UIC0CI & uic_msr) || (UICB0_UIC0NCI & uic_msr))
uic_interrupt(UIC0_DCR_BASE, 0);
#endif
#else /* CONFIG_440 */
uic_interrupt(UIC0_DCR_BASE, 0);
#endif /* CONFIG_440 */
mtdcr(UIC_BSR, uic_msr);
return;
}
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/*
* Install and free a interrupt handler.
*/
void irq_install_handler(int vec, interrupt_handler_t * handler, void *arg)
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{
int i;
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/*
* Print warning when replacing with a different irq vector
*/
if ((irq_vecs[vec].handler != NULL) && (irq_vecs[vec].handler != handler)) {
printf("Interrupt vector %d: handler 0x%x replacing 0x%x\n",
vec, (uint) handler, (uint) irq_vecs[vec].handler);
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}
irq_vecs[vec].handler = handler;
irq_vecs[vec].arg = arg;
i = vec & 0x1f;
if ((vec >= 0) && (vec < 32))
mtdcr(uicer, mfdcr(uicer) | (0x80000000 >> i));
#if (UIC_MAX > 1)
else if ((vec >= 32) && (vec < 64))
mtdcr(uic1er, mfdcr(uic1er) | (0x80000000 >> i));
#endif
#if (UIC_MAX > 2)
else if ((vec >= 64) && (vec < 96))
mtdcr(uic2er, mfdcr(uic2er) | (0x80000000 >> i));
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#endif
#if (UIC_MAX > 3)
else if (vec >= 96)
mtdcr(uic3er, mfdcr(uic3er) | (0x80000000 >> i));
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#endif
debug("Install interrupt for vector %d ==> %p\n", vec, handler);
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}
void irq_free_handler (int vec)
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{
int i;
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debug("Free interrupt for vector %d ==> %p\n",
vec, irq_vecs[vec].handler);
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i = vec & 0x1f;
if ((vec >= 0) && (vec < 32))
mtdcr(uicer, mfdcr(uicer) & ~(0x80000000 >> i));
#if (UIC_MAX > 1)
else if ((vec >= 32) && (vec < 64))
mtdcr(uic1er, mfdcr(uic1er) & ~(0x80000000 >> i));
#endif
#if (UIC_MAX > 2)
else if ((vec >= 64) && (vec < 96))
mtdcr(uic2er, mfdcr(uic2er) & ~(0x80000000 >> i));
#endif
#if (UIC_MAX > 3)
else if (vec >= 96)
mtdcr(uic3er, mfdcr(uic3er) & ~(0x80000000 >> i));
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#endif
irq_vecs[vec].handler = NULL;
irq_vecs[vec].arg = NULL;
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}
void timer_interrupt_cpu (struct pt_regs *regs)
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{
/* nothing to do here */
return;
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}
#if defined(CONFIG_CMD_IRQ)
int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
int vec;
printf ("Interrupt-Information:\n");
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printf ("Nr Routine Arg Count\n");
for (vec = 0; vec < (UIC_MAX * 32); vec++) {
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if (irq_vecs[vec].handler != NULL) {
printf ("%02d %08lx %08lx %d\n",
vec,
(ulong)irq_vecs[vec].handler,
(ulong)irq_vecs[vec].arg,
irq_vecs[vec].count);
}
}
return 0;
}
#endif