mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 17:07:38 +00:00
279 lines
7.1 KiB
C
279 lines
7.1 KiB
C
/*
|
|
* (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
|
|
*
|
|
* Hacked for MPC8260 by Murray.Jensen@cmst.csiro.au, 22-Oct-00
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <command.h>
|
|
#include <mpc8260.h>
|
|
#include <mpc8260_irq.h>
|
|
#include <asm/processor.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
/****************************************************************************/
|
|
|
|
struct irq_action {
|
|
interrupt_handler_t *handler;
|
|
void *arg;
|
|
ulong count;
|
|
};
|
|
|
|
static struct irq_action irq_handlers[NR_IRQS];
|
|
|
|
static ulong ppc_cached_irq_mask[NR_MASK_WORDS];
|
|
|
|
/****************************************************************************/
|
|
/* this section was ripped out of arch/ppc/kernel/ppc8260_pic.c in the */
|
|
/* Linux/PPC 2.4.x source. There was no copyright notice in that file. */
|
|
|
|
/* The 8260 internal interrupt controller. It is usually
|
|
* the only interrupt controller.
|
|
* There are two 32-bit registers (high/low) for up to 64
|
|
* possible interrupts.
|
|
*
|
|
* Now, the fun starts.....Interrupt Numbers DO NOT MAP
|
|
* in a simple arithmetic fashion to mask or pending registers.
|
|
* That is, interrupt 4 does not map to bit position 4.
|
|
* We create two tables, indexed by vector number, to indicate
|
|
* which register to use and which bit in the register to use.
|
|
*/
|
|
static u_char irq_to_siureg[] = {
|
|
1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1,
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1,
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0
|
|
};
|
|
|
|
static u_char irq_to_siubit[] = {
|
|
31, 16, 17, 18, 19, 20, 21, 22,
|
|
23, 24, 25, 26, 27, 28, 29, 30,
|
|
29, 30, 16, 17, 18, 19, 20, 21,
|
|
22, 23, 24, 25, 26, 27, 28, 31,
|
|
0, 1, 2, 3, 4, 5, 6, 7,
|
|
8, 9, 10, 11, 12, 13, 14, 15,
|
|
15, 14, 13, 12, 11, 10, 9, 8,
|
|
7, 6, 5, 4, 3, 2, 1, 0
|
|
};
|
|
|
|
static void m8260_mask_irq (unsigned int irq_nr)
|
|
{
|
|
volatile immap_t *immr = (immap_t *) CFG_IMMR;
|
|
int bit, word;
|
|
volatile uint *simr;
|
|
|
|
bit = irq_to_siubit[irq_nr];
|
|
word = irq_to_siureg[irq_nr];
|
|
|
|
simr = &(immr->im_intctl.ic_simrh);
|
|
ppc_cached_irq_mask[word] &= ~(1 << (31 - bit));
|
|
simr[word] = ppc_cached_irq_mask[word];
|
|
}
|
|
|
|
static void m8260_unmask_irq (unsigned int irq_nr)
|
|
{
|
|
volatile immap_t *immr = (immap_t *) CFG_IMMR;
|
|
int bit, word;
|
|
volatile uint *simr;
|
|
|
|
bit = irq_to_siubit[irq_nr];
|
|
word = irq_to_siureg[irq_nr];
|
|
|
|
simr = &(immr->im_intctl.ic_simrh);
|
|
ppc_cached_irq_mask[word] |= (1 << (31 - bit));
|
|
simr[word] = ppc_cached_irq_mask[word];
|
|
}
|
|
|
|
static void m8260_mask_and_ack (unsigned int irq_nr)
|
|
{
|
|
volatile immap_t *immr = (immap_t *) CFG_IMMR;
|
|
int bit, word;
|
|
volatile uint *simr, *sipnr;
|
|
|
|
bit = irq_to_siubit[irq_nr];
|
|
word = irq_to_siureg[irq_nr];
|
|
|
|
simr = &(immr->im_intctl.ic_simrh);
|
|
sipnr = &(immr->im_intctl.ic_sipnrh);
|
|
ppc_cached_irq_mask[word] &= ~(1 << (31 - bit));
|
|
simr[word] = ppc_cached_irq_mask[word];
|
|
sipnr[word] = 1 << (31 - bit);
|
|
}
|
|
|
|
static int m8260_get_irq (struct pt_regs *regs)
|
|
{
|
|
volatile immap_t *immr = (immap_t *) CFG_IMMR;
|
|
int irq;
|
|
unsigned long bits;
|
|
|
|
/* For MPC8260, read the SIVEC register and shift the bits down
|
|
* to get the irq number. */
|
|
bits = immr->im_intctl.ic_sivec;
|
|
irq = bits >> 26;
|
|
return irq;
|
|
}
|
|
|
|
/* end of code ripped out of arch/ppc/kernel/ppc8260_pic.c */
|
|
/****************************************************************************/
|
|
|
|
int interrupt_init_cpu (unsigned *decrementer_count)
|
|
{
|
|
volatile immap_t *immr = (immap_t *) CFG_IMMR;
|
|
|
|
*decrementer_count = (gd->bus_clk / 4) / CFG_HZ;
|
|
|
|
/* Initialize the default interrupt mapping priorities */
|
|
immr->im_intctl.ic_sicr = 0;
|
|
immr->im_intctl.ic_siprr = 0x05309770;
|
|
immr->im_intctl.ic_scprrh = 0x05309770;
|
|
immr->im_intctl.ic_scprrl = 0x05309770;
|
|
|
|
/* disable all interrupts and clear all pending bits */
|
|
immr->im_intctl.ic_simrh = ppc_cached_irq_mask[0] = 0;
|
|
immr->im_intctl.ic_simrl = ppc_cached_irq_mask[1] = 0;
|
|
immr->im_intctl.ic_sipnrh = 0xffffffff;
|
|
immr->im_intctl.ic_sipnrl = 0xffffffff;
|
|
|
|
#ifdef CONFIG_HYMOD
|
|
/*
|
|
* ensure all external interrupt sources default to trigger on
|
|
* high-to-low transition (i.e. edge triggered active low)
|
|
*/
|
|
immr->im_intctl.ic_siexr = -1;
|
|
#endif
|
|
|
|
return (0);
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
/*
|
|
* Handle external interrupts
|
|
*/
|
|
void external_interrupt (struct pt_regs *regs)
|
|
{
|
|
int irq, unmask = 1;
|
|
|
|
irq = m8260_get_irq (regs);
|
|
|
|
m8260_mask_and_ack (irq);
|
|
|
|
enable_interrupts ();
|
|
|
|
if (irq_handlers[irq].handler != NULL)
|
|
(*irq_handlers[irq].handler) (irq_handlers[irq].arg);
|
|
else {
|
|
printf ("\nBogus External Interrupt IRQ %d\n", irq);
|
|
/*
|
|
* turn off the bogus interrupt, otherwise it
|
|
* might repeat forever
|
|
*/
|
|
unmask = 0;
|
|
}
|
|
|
|
if (unmask)
|
|
m8260_unmask_irq (irq);
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
/*
|
|
* Install and free an interrupt handler.
|
|
*/
|
|
|
|
void
|
|
irq_install_handler (int irq, interrupt_handler_t * handler, void *arg)
|
|
{
|
|
if (irq < 0 || irq >= NR_IRQS) {
|
|
printf ("irq_install_handler: bad irq number %d\n", irq);
|
|
return;
|
|
}
|
|
|
|
if (irq_handlers[irq].handler != NULL)
|
|
printf ("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
|
|
(ulong) handler, (ulong) irq_handlers[irq].handler);
|
|
|
|
irq_handlers[irq].handler = handler;
|
|
irq_handlers[irq].arg = arg;
|
|
|
|
m8260_unmask_irq (irq);
|
|
}
|
|
|
|
void irq_free_handler (int irq)
|
|
{
|
|
if (irq < 0 || irq >= NR_IRQS) {
|
|
printf ("irq_free_handler: bad irq number %d\n", irq);
|
|
return;
|
|
}
|
|
|
|
m8260_mask_irq (irq);
|
|
|
|
irq_handlers[irq].handler = NULL;
|
|
irq_handlers[irq].arg = NULL;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
void timer_interrupt_cpu (struct pt_regs *regs)
|
|
{
|
|
/* nothing to do here */
|
|
return;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
#if defined(CONFIG_CMD_IRQ)
|
|
|
|
/* ripped this out of ppc4xx/interrupts.c */
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* irqinfo - print information about PCI devices
|
|
*
|
|
*/
|
|
void
|
|
do_irqinfo (cmd_tbl_t * cmdtp, bd_t * bd, int flag, int argc, char *argv[])
|
|
{
|
|
int irq, re_enable;
|
|
|
|
re_enable = disable_interrupts ();
|
|
|
|
puts ("\nInterrupt-Information:\n"
|
|
"Nr Routine Arg Count\n");
|
|
|
|
for (irq = 0; irq < 32; irq++)
|
|
if (irq_handlers[irq].handler != NULL)
|
|
printf ("%02d %08lx %08lx %ld\n", irq,
|
|
(ulong) irq_handlers[irq].handler,
|
|
(ulong) irq_handlers[irq].arg,
|
|
irq_handlers[irq].count);
|
|
|
|
if (re_enable)
|
|
enable_interrupts ();
|
|
}
|
|
|
|
#endif
|