linux/arch/mips/mti-malta/malta-int.c

394 lines
9.9 KiB
C

/*
* 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.
*
* Carsten Langgaard, carstenl@mips.com
* Copyright (C) 2000, 2001, 2004 MIPS Technologies, Inc.
* Copyright (C) 2001 Ralf Baechle
* Copyright (C) 2013 Imagination Technologies Ltd.
*
* Routines for generic manipulation of the interrupts found on the MIPS
* Malta board. The interrupt controller is located in the South Bridge
* a PIIX4 device with two internal 82C95 interrupt controllers.
*/
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irqchip/mips-gic.h>
#include <linux/kernel_stat.h>
#include <linux/kernel.h>
#include <linux/random.h>
#include <asm/traps.h>
#include <asm/i8259.h>
#include <asm/irq_cpu.h>
#include <asm/irq_regs.h>
#include <asm/mips-cm.h>
#include <asm/mips-boards/malta.h>
#include <asm/mips-boards/maltaint.h>
#include <asm/gt64120.h>
#include <asm/mips-boards/generic.h>
#include <asm/mips-boards/msc01_pci.h>
#include <asm/msc01_ic.h>
#include <asm/setup.h>
#include <asm/rtlx.h>
static void __iomem *_msc01_biu_base;
static DEFINE_RAW_SPINLOCK(mips_irq_lock);
static inline int mips_pcibios_iack(void)
{
int irq;
/*
* Determine highest priority pending interrupt by performing
* a PCI Interrupt Acknowledge cycle.
*/
switch (mips_revision_sconid) {
case MIPS_REVISION_SCON_SOCIT:
case MIPS_REVISION_SCON_ROCIT:
case MIPS_REVISION_SCON_SOCITSC:
case MIPS_REVISION_SCON_SOCITSCP:
MSC_READ(MSC01_PCI_IACK, irq);
irq &= 0xff;
break;
case MIPS_REVISION_SCON_GT64120:
irq = GT_READ(GT_PCI0_IACK_OFS);
irq &= 0xff;
break;
case MIPS_REVISION_SCON_BONITO:
/* The following will generate a PCI IACK cycle on the
* Bonito controller. It's a little bit kludgy, but it
* was the easiest way to implement it in hardware at
* the given time.
*/
BONITO_PCIMAP_CFG = 0x20000;
/* Flush Bonito register block */
(void) BONITO_PCIMAP_CFG;
iob(); /* sync */
irq = __raw_readl((u32 *)_pcictrl_bonito_pcicfg);
iob(); /* sync */
irq &= 0xff;
BONITO_PCIMAP_CFG = 0;
break;
default:
pr_emerg("Unknown system controller.\n");
return -1;
}
return irq;
}
static inline int get_int(void)
{
unsigned long flags;
int irq;
raw_spin_lock_irqsave(&mips_irq_lock, flags);
irq = mips_pcibios_iack();
/*
* The only way we can decide if an interrupt is spurious
* is by checking the 8259 registers. This needs a spinlock
* on an SMP system, so leave it up to the generic code...
*/
raw_spin_unlock_irqrestore(&mips_irq_lock, flags);
return irq;
}
static void malta_hw0_irqdispatch(void)
{
int irq;
irq = get_int();
if (irq < 0) {
/* interrupt has already been cleared */
return;
}
do_IRQ(MALTA_INT_BASE + irq);
#ifdef CONFIG_MIPS_VPE_APSP_API_MT
if (aprp_hook)
aprp_hook();
#endif
}
static irqreturn_t i8259_handler(int irq, void *dev_id)
{
malta_hw0_irqdispatch();
return IRQ_HANDLED;
}
static void corehi_irqdispatch(void)
{
unsigned int intedge, intsteer, pcicmd, pcibadaddr;
unsigned int pcimstat, intisr, inten, intpol;
unsigned int intrcause, datalo, datahi;
struct pt_regs *regs = get_irq_regs();
pr_emerg("CoreHI interrupt, shouldn't happen, we die here!\n");
pr_emerg("epc : %08lx\nStatus: %08lx\n"
"Cause : %08lx\nbadVaddr : %08lx\n",
regs->cp0_epc, regs->cp0_status,
regs->cp0_cause, regs->cp0_badvaddr);
/* Read all the registers and then print them as there is a
problem with interspersed printk's upsetting the Bonito controller.
Do it for the others too.
*/
switch (mips_revision_sconid) {
case MIPS_REVISION_SCON_SOCIT:
case MIPS_REVISION_SCON_ROCIT:
case MIPS_REVISION_SCON_SOCITSC:
case MIPS_REVISION_SCON_SOCITSCP:
ll_msc_irq();
break;
case MIPS_REVISION_SCON_GT64120:
intrcause = GT_READ(GT_INTRCAUSE_OFS);
datalo = GT_READ(GT_CPUERR_ADDRLO_OFS);
datahi = GT_READ(GT_CPUERR_ADDRHI_OFS);
pr_emerg("GT_INTRCAUSE = %08x\n", intrcause);
pr_emerg("GT_CPUERR_ADDR = %02x%08x\n",
datahi, datalo);
break;
case MIPS_REVISION_SCON_BONITO:
pcibadaddr = BONITO_PCIBADADDR;
pcimstat = BONITO_PCIMSTAT;
intisr = BONITO_INTISR;
inten = BONITO_INTEN;
intpol = BONITO_INTPOL;
intedge = BONITO_INTEDGE;
intsteer = BONITO_INTSTEER;
pcicmd = BONITO_PCICMD;
pr_emerg("BONITO_INTISR = %08x\n", intisr);
pr_emerg("BONITO_INTEN = %08x\n", inten);
pr_emerg("BONITO_INTPOL = %08x\n", intpol);
pr_emerg("BONITO_INTEDGE = %08x\n", intedge);
pr_emerg("BONITO_INTSTEER = %08x\n", intsteer);
pr_emerg("BONITO_PCICMD = %08x\n", pcicmd);
pr_emerg("BONITO_PCIBADADDR = %08x\n", pcibadaddr);
pr_emerg("BONITO_PCIMSTAT = %08x\n", pcimstat);
break;
}
die("CoreHi interrupt", regs);
}
static irqreturn_t corehi_handler(int irq, void *dev_id)
{
corehi_irqdispatch();
return IRQ_HANDLED;
}
#ifdef CONFIG_MIPS_MT_SMP
#define MIPS_CPU_IPI_RESCHED_IRQ 0 /* SW int 0 for resched */
#define C_RESCHED C_SW0
#define MIPS_CPU_IPI_CALL_IRQ 1 /* SW int 1 for resched */
#define C_CALL C_SW1
static int cpu_ipi_resched_irq, cpu_ipi_call_irq;
static void ipi_resched_dispatch(void)
{
do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ);
}
static void ipi_call_dispatch(void)
{
do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ);
}
static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
{
#ifdef CONFIG_MIPS_VPE_APSP_API_CMP
if (aprp_hook)
aprp_hook();
#endif
scheduler_ipi();
return IRQ_HANDLED;
}
static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
{
generic_smp_call_function_interrupt();
return IRQ_HANDLED;
}
static struct irqaction irq_resched = {
.handler = ipi_resched_interrupt,
.flags = IRQF_PERCPU,
.name = "IPI_resched"
};
static struct irqaction irq_call = {
.handler = ipi_call_interrupt,
.flags = IRQF_PERCPU,
.name = "IPI_call"
};
#endif /* CONFIG_MIPS_MT_SMP */
static struct irqaction i8259irq = {
.handler = i8259_handler,
.name = "XT-PIC cascade",
.flags = IRQF_NO_THREAD,
};
static struct irqaction corehi_irqaction = {
.handler = corehi_handler,
.name = "CoreHi",
.flags = IRQF_NO_THREAD,
};
static msc_irqmap_t msc_irqmap[] __initdata = {
{MSC01C_INT_TMR, MSC01_IRQ_EDGE, 0},
{MSC01C_INT_PCI, MSC01_IRQ_LEVEL, 0},
};
static int msc_nr_irqs __initdata = ARRAY_SIZE(msc_irqmap);
static msc_irqmap_t msc_eicirqmap[] __initdata = {
{MSC01E_INT_SW0, MSC01_IRQ_LEVEL, 0},
{MSC01E_INT_SW1, MSC01_IRQ_LEVEL, 0},
{MSC01E_INT_I8259A, MSC01_IRQ_LEVEL, 0},
{MSC01E_INT_SMI, MSC01_IRQ_LEVEL, 0},
{MSC01E_INT_COREHI, MSC01_IRQ_LEVEL, 0},
{MSC01E_INT_CORELO, MSC01_IRQ_LEVEL, 0},
{MSC01E_INT_TMR, MSC01_IRQ_EDGE, 0},
{MSC01E_INT_PCI, MSC01_IRQ_LEVEL, 0},
{MSC01E_INT_PERFCTR, MSC01_IRQ_LEVEL, 0},
{MSC01E_INT_CPUCTR, MSC01_IRQ_LEVEL, 0}
};
static int msc_nr_eicirqs __initdata = ARRAY_SIZE(msc_eicirqmap);
void __init arch_init_ipiirq(int irq, struct irqaction *action)
{
setup_irq(irq, action);
irq_set_handler(irq, handle_percpu_irq);
}
void __init arch_init_irq(void)
{
int corehi_irq, i8259_irq;
init_i8259_irqs();
if (!cpu_has_veic)
mips_cpu_irq_init();
if (mips_cm_present()) {
write_gcr_gic_base(GIC_BASE_ADDR | CM_GCR_GIC_BASE_GICEN_MSK);
gic_present = 1;
} else {
if (mips_revision_sconid == MIPS_REVISION_SCON_ROCIT) {
_msc01_biu_base = ioremap_nocache(MSC01_BIU_REG_BASE,
MSC01_BIU_ADDRSPACE_SZ);
gic_present =
(__raw_readl(_msc01_biu_base + MSC01_SC_CFG_OFS) &
MSC01_SC_CFG_GICPRES_MSK) >>
MSC01_SC_CFG_GICPRES_SHF;
}
}
if (gic_present)
pr_debug("GIC present\n");
switch (mips_revision_sconid) {
case MIPS_REVISION_SCON_SOCIT:
case MIPS_REVISION_SCON_ROCIT:
if (cpu_has_veic)
init_msc_irqs(MIPS_MSC01_IC_REG_BASE,
MSC01E_INT_BASE, msc_eicirqmap,
msc_nr_eicirqs);
else
init_msc_irqs(MIPS_MSC01_IC_REG_BASE,
MSC01C_INT_BASE, msc_irqmap,
msc_nr_irqs);
break;
case MIPS_REVISION_SCON_SOCITSC:
case MIPS_REVISION_SCON_SOCITSCP:
if (cpu_has_veic)
init_msc_irqs(MIPS_SOCITSC_IC_REG_BASE,
MSC01E_INT_BASE, msc_eicirqmap,
msc_nr_eicirqs);
else
init_msc_irqs(MIPS_SOCITSC_IC_REG_BASE,
MSC01C_INT_BASE, msc_irqmap,
msc_nr_irqs);
}
if (gic_present) {
int i;
gic_init(GIC_BASE_ADDR, GIC_ADDRSPACE_SZ, MIPSCPU_INT_GIC,
MIPS_GIC_IRQ_BASE);
if (!mips_cm_present()) {
/* Enable the GIC */
i = __raw_readl(_msc01_biu_base + MSC01_SC_CFG_OFS);
__raw_writel(i | (0x1 << MSC01_SC_CFG_GICENA_SHF),
_msc01_biu_base + MSC01_SC_CFG_OFS);
pr_debug("GIC Enabled\n");
}
i8259_irq = MIPS_GIC_IRQ_BASE + GIC_INT_I8259A;
corehi_irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_COREHI;
} else {
#if defined(CONFIG_MIPS_MT_SMP)
/* set up ipi interrupts */
if (cpu_has_veic) {
set_vi_handler (MSC01E_INT_SW0, ipi_resched_dispatch);
set_vi_handler (MSC01E_INT_SW1, ipi_call_dispatch);
cpu_ipi_resched_irq = MSC01E_INT_SW0;
cpu_ipi_call_irq = MSC01E_INT_SW1;
} else {
cpu_ipi_resched_irq = MIPS_CPU_IRQ_BASE +
MIPS_CPU_IPI_RESCHED_IRQ;
cpu_ipi_call_irq = MIPS_CPU_IRQ_BASE +
MIPS_CPU_IPI_CALL_IRQ;
}
arch_init_ipiirq(cpu_ipi_resched_irq, &irq_resched);
arch_init_ipiirq(cpu_ipi_call_irq, &irq_call);
#endif
if (cpu_has_veic) {
set_vi_handler(MSC01E_INT_I8259A,
malta_hw0_irqdispatch);
set_vi_handler(MSC01E_INT_COREHI,
corehi_irqdispatch);
i8259_irq = MSC01E_INT_BASE + MSC01E_INT_I8259A;
corehi_irq = MSC01E_INT_BASE + MSC01E_INT_COREHI;
} else {
i8259_irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_I8259A;
corehi_irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_COREHI;
}
}
setup_irq(i8259_irq, &i8259irq);
setup_irq(corehi_irq, &corehi_irqaction);
}
void malta_be_init(void)
{
/* Could change CM error mask register. */
}
int malta_be_handler(struct pt_regs *regs, int is_fixup)
{
/* This duplicates the handling in do_be which seems wrong */
int retval = is_fixup ? MIPS_BE_FIXUP : MIPS_BE_FATAL;
mips_cm_error_report();
return retval;
}