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