1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
466 lines
12 KiB
C
466 lines
12 KiB
C
/*
|
|
* Copyright 2001 MontaVista Software Inc.
|
|
* Author: MontaVista Software, Inc.
|
|
* ahennessy@mvista.com
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 2000-2001 Toshiba Corporation
|
|
*
|
|
* 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
|
|
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
|
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
|
|
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* 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.,
|
|
* 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
#include <linux/config.h>
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/types.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/timex.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/random.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/bitops.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/mipsregs.h>
|
|
#include <asm/system.h>
|
|
|
|
#include <asm/ptrace.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/jmr3927/irq.h>
|
|
#include <asm/debug.h>
|
|
#include <asm/jmr3927/jmr3927.h>
|
|
|
|
#if JMR3927_IRQ_END > NR_IRQS
|
|
#error JMR3927_IRQ_END > NR_IRQS
|
|
#endif
|
|
|
|
struct tb_irq_space* tb_irq_spaces;
|
|
|
|
static int jmr3927_irq_base = -1;
|
|
|
|
#ifdef CONFIG_PCI
|
|
static int jmr3927_gen_iack(void)
|
|
{
|
|
/* generate ACK cycle */
|
|
#ifdef __BIG_ENDIAN
|
|
return (tx3927_pcicptr->iiadp >> 24) & 0xff;
|
|
#else
|
|
return tx3927_pcicptr->iiadp & 0xff;
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
extern asmlinkage void jmr3927_IRQ(void);
|
|
|
|
#define irc_dlevel 0
|
|
#define irc_elevel 1
|
|
|
|
static unsigned char irc_level[TX3927_NUM_IR] = {
|
|
5, 5, 5, 5, 5, 5, /* INT[5:0] */
|
|
7, 7, /* SIO */
|
|
5, 5, 5, 0, 0, /* DMA, PIO, PCI */
|
|
6, 6, 6 /* TMR */
|
|
};
|
|
|
|
static void jmr3927_irq_disable(unsigned int irq_nr);
|
|
static void jmr3927_irq_enable(unsigned int irq_nr);
|
|
|
|
static DEFINE_SPINLOCK(jmr3927_irq_lock);
|
|
|
|
static unsigned int jmr3927_irq_startup(unsigned int irq)
|
|
{
|
|
jmr3927_irq_enable(irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define jmr3927_irq_shutdown jmr3927_irq_disable
|
|
|
|
static void jmr3927_irq_ack(unsigned int irq)
|
|
{
|
|
if (irq == JMR3927_IRQ_IRC_TMR0)
|
|
jmr3927_tmrptr->tisr = 0; /* ack interrupt */
|
|
|
|
jmr3927_irq_disable(irq);
|
|
}
|
|
|
|
static void jmr3927_irq_end(unsigned int irq)
|
|
{
|
|
jmr3927_irq_enable(irq);
|
|
}
|
|
|
|
static void jmr3927_irq_disable(unsigned int irq_nr)
|
|
{
|
|
struct tb_irq_space* sp;
|
|
unsigned long flags;
|
|
|
|
spinlock_irqsave(&jmr3927_irq_lock, flags);
|
|
for (sp = tb_irq_spaces; sp; sp = sp->next) {
|
|
if (sp->start_irqno <= irq_nr &&
|
|
irq_nr < sp->start_irqno + sp->nr_irqs) {
|
|
if (sp->mask_func)
|
|
sp->mask_func(irq_nr - sp->start_irqno,
|
|
sp->space_id);
|
|
break;
|
|
}
|
|
}
|
|
spinlock_irqrestore(&jmr3927_irq_lock, flags);
|
|
}
|
|
|
|
static void jmr3927_irq_enable(unsigned int irq_nr)
|
|
{
|
|
struct tb_irq_space* sp;
|
|
unsigned long flags;
|
|
|
|
spinlock_irqsave(&jmr3927_irq_lock, flags);
|
|
for (sp = tb_irq_spaces; sp; sp = sp->next) {
|
|
if (sp->start_irqno <= irq_nr &&
|
|
irq_nr < sp->start_irqno + sp->nr_irqs) {
|
|
if (sp->unmask_func)
|
|
sp->unmask_func(irq_nr - sp->start_irqno,
|
|
sp->space_id);
|
|
break;
|
|
}
|
|
}
|
|
spinlock_irqrestore(&jmr3927_irq_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* CP0_STATUS is a thread's resource (saved/restored on context switch).
|
|
* So disable_irq/enable_irq MUST handle IOC/ISAC/IRC registers.
|
|
*/
|
|
static void mask_irq_isac(int irq_nr, int space_id)
|
|
{
|
|
/* 0: mask */
|
|
unsigned char imask =
|
|
jmr3927_isac_reg_in(JMR3927_ISAC_INTM_ADDR);
|
|
unsigned int bit = 1 << irq_nr;
|
|
jmr3927_isac_reg_out(imask & ~bit, JMR3927_ISAC_INTM_ADDR);
|
|
/* flush write buffer */
|
|
(void)jmr3927_ioc_reg_in(JMR3927_IOC_REV_ADDR);
|
|
}
|
|
static void unmask_irq_isac(int irq_nr, int space_id)
|
|
{
|
|
/* 0: mask */
|
|
unsigned char imask = jmr3927_isac_reg_in(JMR3927_ISAC_INTM_ADDR);
|
|
unsigned int bit = 1 << irq_nr;
|
|
jmr3927_isac_reg_out(imask | bit, JMR3927_ISAC_INTM_ADDR);
|
|
/* flush write buffer */
|
|
(void)jmr3927_ioc_reg_in(JMR3927_IOC_REV_ADDR);
|
|
}
|
|
|
|
static void mask_irq_ioc(int irq_nr, int space_id)
|
|
{
|
|
/* 0: mask */
|
|
unsigned char imask = jmr3927_ioc_reg_in(JMR3927_IOC_INTM_ADDR);
|
|
unsigned int bit = 1 << irq_nr;
|
|
jmr3927_ioc_reg_out(imask & ~bit, JMR3927_IOC_INTM_ADDR);
|
|
/* flush write buffer */
|
|
(void)jmr3927_ioc_reg_in(JMR3927_IOC_REV_ADDR);
|
|
}
|
|
static void unmask_irq_ioc(int irq_nr, int space_id)
|
|
{
|
|
/* 0: mask */
|
|
unsigned char imask = jmr3927_ioc_reg_in(JMR3927_IOC_INTM_ADDR);
|
|
unsigned int bit = 1 << irq_nr;
|
|
jmr3927_ioc_reg_out(imask | bit, JMR3927_IOC_INTM_ADDR);
|
|
/* flush write buffer */
|
|
(void)jmr3927_ioc_reg_in(JMR3927_IOC_REV_ADDR);
|
|
}
|
|
|
|
static void mask_irq_irc(int irq_nr, int space_id)
|
|
{
|
|
volatile unsigned long *ilrp = &tx3927_ircptr->ilr[irq_nr / 2];
|
|
if (irq_nr & 1)
|
|
*ilrp = (*ilrp & 0x00ff) | (irc_dlevel << 8);
|
|
else
|
|
*ilrp = (*ilrp & 0xff00) | irc_dlevel;
|
|
/* update IRCSR */
|
|
tx3927_ircptr->imr = 0;
|
|
tx3927_ircptr->imr = irc_elevel;
|
|
}
|
|
static void unmask_irq_irc(int irq_nr, int space_id)
|
|
{
|
|
volatile unsigned long *ilrp = &tx3927_ircptr->ilr[irq_nr / 2];
|
|
if (irq_nr & 1)
|
|
*ilrp = (*ilrp & 0x00ff) | (irc_level[irq_nr] << 8);
|
|
else
|
|
*ilrp = (*ilrp & 0xff00) | irc_level[irq_nr];
|
|
/* update IRCSR */
|
|
tx3927_ircptr->imr = 0;
|
|
tx3927_ircptr->imr = irc_elevel;
|
|
}
|
|
|
|
struct tb_irq_space jmr3927_isac_irqspace = {
|
|
.next = NULL,
|
|
.start_irqno = JMR3927_IRQ_ISAC,
|
|
nr_irqs : JMR3927_NR_IRQ_ISAC,
|
|
.mask_func = mask_irq_isac,
|
|
.unmask_func = unmask_irq_isac,
|
|
.name = "ISAC",
|
|
.space_id = 0,
|
|
can_share : 0
|
|
};
|
|
struct tb_irq_space jmr3927_ioc_irqspace = {
|
|
.next = NULL,
|
|
.start_irqno = JMR3927_IRQ_IOC,
|
|
nr_irqs : JMR3927_NR_IRQ_IOC,
|
|
.mask_func = mask_irq_ioc,
|
|
.unmask_func = unmask_irq_ioc,
|
|
.name = "IOC",
|
|
.space_id = 0,
|
|
can_share : 1
|
|
};
|
|
struct tb_irq_space jmr3927_irc_irqspace = {
|
|
.next = NULL,
|
|
.start_irqno = JMR3927_IRQ_IRC,
|
|
nr_irqs : JMR3927_NR_IRQ_IRC,
|
|
.mask_func = mask_irq_irc,
|
|
.unmask_func = unmask_irq_irc,
|
|
.name = "on-chip",
|
|
.space_id = 0,
|
|
can_share : 0
|
|
};
|
|
|
|
void jmr3927_spurious(struct pt_regs *regs)
|
|
{
|
|
#ifdef CONFIG_TX_BRANCH_LIKELY_BUG_WORKAROUND
|
|
tx_branch_likely_bug_fixup(regs);
|
|
#endif
|
|
printk(KERN_WARNING "spurious interrupt (cause 0x%lx, pc 0x%lx, ra 0x%lx).\n",
|
|
regs->cp0_cause, regs->cp0_epc, regs->regs[31]);
|
|
}
|
|
|
|
void jmr3927_irc_irqdispatch(struct pt_regs *regs)
|
|
{
|
|
int irq;
|
|
|
|
#ifdef CONFIG_TX_BRANCH_LIKELY_BUG_WORKAROUND
|
|
tx_branch_likely_bug_fixup(regs);
|
|
#endif
|
|
if ((regs->cp0_cause & CAUSEF_IP7) == 0) {
|
|
#if 0
|
|
jmr3927_spurious(regs);
|
|
#endif
|
|
return;
|
|
}
|
|
irq = (regs->cp0_cause >> CAUSEB_IP2) & 0x0f;
|
|
|
|
do_IRQ(irq + JMR3927_IRQ_IRC, regs);
|
|
}
|
|
|
|
static void jmr3927_ioc_interrupt(int irq, void *dev_id, struct pt_regs *regs)
|
|
{
|
|
unsigned char istat = jmr3927_ioc_reg_in(JMR3927_IOC_INTS2_ADDR);
|
|
int i;
|
|
|
|
for (i = 0; i < JMR3927_NR_IRQ_IOC; i++) {
|
|
if (istat & (1 << i)) {
|
|
irq = JMR3927_IRQ_IOC + i;
|
|
do_IRQ(irq, regs);
|
|
}
|
|
}
|
|
}
|
|
|
|
static struct irqaction ioc_action = {
|
|
jmr3927_ioc_interrupt, 0, CPU_MASK_NONE, "IOC", NULL, NULL,
|
|
};
|
|
|
|
static void jmr3927_isac_interrupt(int irq, void *dev_id, struct pt_regs *regs)
|
|
{
|
|
unsigned char istat = jmr3927_isac_reg_in(JMR3927_ISAC_INTS2_ADDR);
|
|
int i;
|
|
|
|
for (i = 0; i < JMR3927_NR_IRQ_ISAC; i++) {
|
|
if (istat & (1 << i)) {
|
|
irq = JMR3927_IRQ_ISAC + i;
|
|
do_IRQ(irq, regs);
|
|
}
|
|
}
|
|
}
|
|
|
|
static struct irqaction isac_action = {
|
|
jmr3927_isac_interrupt, 0, CPU_MASK_NONE, "ISAC", NULL, NULL,
|
|
};
|
|
|
|
|
|
static void jmr3927_isaerr_interrupt(int irq, void * dev_id, struct pt_regs * regs)
|
|
{
|
|
printk(KERN_WARNING "ISA error interrupt (irq 0x%x).\n", irq);
|
|
}
|
|
static struct irqaction isaerr_action = {
|
|
jmr3927_isaerr_interrupt, 0, CPU_MASK_NONE, "ISA error", NULL, NULL,
|
|
};
|
|
|
|
static void jmr3927_pcierr_interrupt(int irq, void * dev_id, struct pt_regs * regs)
|
|
{
|
|
printk(KERN_WARNING "PCI error interrupt (irq 0x%x).\n", irq);
|
|
printk(KERN_WARNING "pcistat:%02x, lbstat:%04lx\n",
|
|
tx3927_pcicptr->pcistat, tx3927_pcicptr->lbstat);
|
|
}
|
|
static struct irqaction pcierr_action = {
|
|
jmr3927_pcierr_interrupt, 0, CPU_MASK_NONE, "PCI error", NULL, NULL,
|
|
};
|
|
|
|
int jmr3927_ether1_irq = 0;
|
|
|
|
void jmr3927_irq_init(u32 irq_base);
|
|
|
|
void __init arch_init_irq(void)
|
|
{
|
|
/* look for io board's presence */
|
|
int have_isac = jmr3927_have_isac();
|
|
|
|
/* Now, interrupt control disabled, */
|
|
/* all IRC interrupts are masked, */
|
|
/* all IRC interrupt mode are Low Active. */
|
|
|
|
if (have_isac) {
|
|
|
|
/* ETHER1 (NE2000 compatible 10M-Ether) parameter setup */
|
|
/* temporary enable interrupt control */
|
|
tx3927_ircptr->cer = 1;
|
|
/* ETHER1 Int. Is High-Active. */
|
|
if (tx3927_ircptr->ssr & (1 << 0))
|
|
jmr3927_ether1_irq = JMR3927_IRQ_IRC_INT0;
|
|
#if 0 /* INT3 may be asserted by ether0 (even after reboot...) */
|
|
else if (tx3927_ircptr->ssr & (1 << 3))
|
|
jmr3927_ether1_irq = JMR3927_IRQ_IRC_INT3;
|
|
#endif
|
|
/* disable interrupt control */
|
|
tx3927_ircptr->cer = 0;
|
|
|
|
/* Ether1: High Active */
|
|
if (jmr3927_ether1_irq) {
|
|
int ether1_irc = jmr3927_ether1_irq - JMR3927_IRQ_IRC;
|
|
tx3927_ircptr->cr[ether1_irc / 8] |=
|
|
TX3927_IRCR_HIGH << ((ether1_irc % 8) * 2);
|
|
}
|
|
}
|
|
|
|
/* mask all IOC interrupts */
|
|
jmr3927_ioc_reg_out(0, JMR3927_IOC_INTM_ADDR);
|
|
/* setup IOC interrupt mode (SOFT:High Active, Others:Low Active) */
|
|
jmr3927_ioc_reg_out(JMR3927_IOC_INTF_SOFT, JMR3927_IOC_INTP_ADDR);
|
|
|
|
if (have_isac) {
|
|
/* mask all ISAC interrupts */
|
|
jmr3927_isac_reg_out(0, JMR3927_ISAC_INTM_ADDR);
|
|
/* setup ISAC interrupt mode (ISAIRQ3,ISAIRQ5:Low Active ???) */
|
|
jmr3927_isac_reg_out(JMR3927_ISAC_INTF_IRQ3|JMR3927_ISAC_INTF_IRQ5, JMR3927_ISAC_INTP_ADDR);
|
|
}
|
|
|
|
/* clear PCI Soft interrupts */
|
|
jmr3927_ioc_reg_out(0, JMR3927_IOC_INTS1_ADDR);
|
|
/* clear PCI Reset interrupts */
|
|
jmr3927_ioc_reg_out(0, JMR3927_IOC_RESET_ADDR);
|
|
|
|
/* enable interrupt control */
|
|
tx3927_ircptr->cer = TX3927_IRCER_ICE;
|
|
tx3927_ircptr->imr = irc_elevel;
|
|
|
|
jmr3927_irq_init(NR_ISA_IRQS);
|
|
|
|
set_except_vector(0, jmr3927_IRQ);
|
|
|
|
/* setup irq space */
|
|
add_tb_irq_space(&jmr3927_isac_irqspace);
|
|
add_tb_irq_space(&jmr3927_ioc_irqspace);
|
|
add_tb_irq_space(&jmr3927_irc_irqspace);
|
|
|
|
/* setup IOC interrupt 1 (PCI, MODEM) */
|
|
setup_irq(JMR3927_IRQ_IOCINT, &ioc_action);
|
|
|
|
if (have_isac) {
|
|
setup_irq(JMR3927_IRQ_ISACINT, &isac_action);
|
|
setup_irq(JMR3927_IRQ_ISAC_ISAER, &isaerr_action);
|
|
}
|
|
|
|
#ifdef CONFIG_PCI
|
|
setup_irq(JMR3927_IRQ_IRC_PCI, &pcierr_action);
|
|
#endif
|
|
|
|
/* enable all CPU interrupt bits. */
|
|
set_c0_status(ST0_IM); /* IE bit is still 0. */
|
|
}
|
|
|
|
static hw_irq_controller jmr3927_irq_controller = {
|
|
"jmr3927_irq",
|
|
jmr3927_irq_startup,
|
|
jmr3927_irq_shutdown,
|
|
jmr3927_irq_enable,
|
|
jmr3927_irq_disable,
|
|
jmr3927_irq_ack,
|
|
jmr3927_irq_end,
|
|
};
|
|
|
|
void jmr3927_irq_init(u32 irq_base)
|
|
{
|
|
u32 i;
|
|
|
|
for (i= irq_base; i< irq_base + JMR3927_NR_IRQ_IRC + JMR3927_NR_IRQ_IOC; i++) {
|
|
irq_desc[i].status = IRQ_DISABLED;
|
|
irq_desc[i].action = NULL;
|
|
irq_desc[i].depth = 1;
|
|
irq_desc[i].handler = &jmr3927_irq_controller;
|
|
}
|
|
|
|
jmr3927_irq_base = irq_base;
|
|
}
|
|
|
|
#ifdef CONFIG_TX_BRANCH_LIKELY_BUG_WORKAROUND
|
|
static int tx_branch_likely_bug_count = 0;
|
|
static int have_tx_branch_likely_bug = 0;
|
|
void tx_branch_likely_bug_fixup(struct pt_regs *regs)
|
|
{
|
|
/* TX39/49-BUG: Under this condition, the insn in delay slot
|
|
of the branch likely insn is executed (not nullified) even
|
|
the branch condition is false. */
|
|
if (!have_tx_branch_likely_bug)
|
|
return;
|
|
if ((regs->cp0_epc & 0xfff) == 0xffc &&
|
|
KSEGX(regs->cp0_epc) != KSEG0 &&
|
|
KSEGX(regs->cp0_epc) != KSEG1) {
|
|
unsigned int insn = *(unsigned int*)(regs->cp0_epc - 4);
|
|
/* beql,bnel,blezl,bgtzl */
|
|
/* bltzl,bgezl,blezall,bgezall */
|
|
/* bczfl, bcztl */
|
|
if ((insn & 0xf0000000) == 0x50000000 ||
|
|
(insn & 0xfc0e0000) == 0x04020000 ||
|
|
(insn & 0xf3fe0000) == 0x41020000) {
|
|
regs->cp0_epc -= 4;
|
|
tx_branch_likely_bug_count++;
|
|
printk(KERN_INFO
|
|
"fix branch-likery bug in %s (insn %08x)\n",
|
|
current->comm, insn);
|
|
}
|
|
}
|
|
}
|
|
#endif
|