2 * Carsten Langgaard, carstenl@mips.com
3 * Copyright (C) 2000, 2001, 2004 MIPS Technologies, Inc.
4 * Copyright (C) 2001 Ralf Baechle
6 * This program is free software; you can distribute it and/or modify it
7 * under the terms of the GNU General Public License (Version 2) as
8 * published by the Free Software Foundation.
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
19 * Routines for generic manipulation of the interrupts found on the MIPS
21 * The interrupt controller is located in the South Bridge a PIIX4 device
22 * with two internal 82C95 interrupt controllers.
24 #include <linux/init.h>
25 #include <linux/irq.h>
26 #include <linux/sched.h>
27 #include <linux/slab.h>
28 #include <linux/interrupt.h>
29 #include <linux/kernel_stat.h>
30 #include <linux/random.h>
32 #include <asm/i8259.h>
34 #include <asm/mips-boards/malta.h>
35 #include <asm/mips-boards/maltaint.h>
36 #include <asm/mips-boards/piix4.h>
37 #include <asm/gt64120.h>
38 #include <asm/mips-boards/generic.h>
39 #include <asm/mips-boards/msc01_pci.h>
41 extern asmlinkage void mipsIRQ(void);
43 static DEFINE_SPINLOCK(mips_irq_lock);
45 static inline int mips_pcibios_iack(void)
51 * Determine highest priority pending interrupt by performing
52 * a PCI Interrupt Acknowledge cycle.
54 switch(mips_revision_corid) {
55 case MIPS_REVISION_CORID_CORE_MSC:
56 case MIPS_REVISION_CORID_CORE_FPGA2:
57 case MIPS_REVISION_CORID_CORE_EMUL_MSC:
58 MSC_READ(MSC01_PCI_IACK, irq);
61 case MIPS_REVISION_CORID_QED_RM5261:
62 case MIPS_REVISION_CORID_CORE_LV:
63 case MIPS_REVISION_CORID_CORE_FPGA:
64 case MIPS_REVISION_CORID_CORE_FPGAR2:
65 irq = GT_READ(GT_PCI0_IACK_OFS);
68 case MIPS_REVISION_CORID_BONITO64:
69 case MIPS_REVISION_CORID_CORE_20K:
70 case MIPS_REVISION_CORID_CORE_EMUL_BON:
71 /* The following will generate a PCI IACK cycle on the
72 * Bonito controller. It's a little bit kludgy, but it
73 * was the easiest way to implement it in hardware at
76 BONITO_PCIMAP_CFG = 0x20000;
78 /* Flush Bonito register block */
79 dummy = BONITO_PCIMAP_CFG;
82 irq = *(volatile u32 *)(_pcictrl_bonito_pcicfg);
85 BONITO_PCIMAP_CFG = 0;
88 printk("Unknown Core card, don't know the system controller.\n");
94 static inline int get_int(int *irq)
98 spin_lock_irqsave(&mips_irq_lock, flags);
100 *irq = mips_pcibios_iack();
103 * IRQ7 is used to detect spurious interrupts.
104 * The interrupt acknowledge cycle returns IRQ7, if no
105 * interrupts is requested.
106 * We can differentiate between this situation and a
107 * "Normal" IRQ7 by reading the ISR.
111 outb(PIIX4_OCW3_SEL | PIIX4_OCW3_ISR,
113 if (!(inb(PIIX4_ICTLR1_OCW3) & (1 << 7))) {
114 spin_unlock_irqrestore(&mips_irq_lock, flags);
115 printk("We got a spurious interrupt from PIIX4.\n");
116 atomic_inc(&irq_err_count);
117 return -1; /* Spurious interrupt. */
121 spin_unlock_irqrestore(&mips_irq_lock, flags);
126 void malta_hw0_irqdispatch(struct pt_regs *regs)
131 return; /* interrupt has already been cleared */
136 void corehi_irqdispatch(struct pt_regs *regs)
138 unsigned int data,datahi;
140 /* Mask out corehi interrupt. */
141 clear_c0_status(IE_IRQ3);
143 printk("CoreHI interrupt, shouldn't happen, so we die here!!!\n");
144 printk("epc : %08lx\nStatus: %08lx\nCause : %08lx\nbadVaddr : %08lx\n"
145 , regs->cp0_epc, regs->cp0_status, regs->cp0_cause, regs->cp0_badvaddr);
146 switch(mips_revision_corid) {
147 case MIPS_REVISION_CORID_CORE_MSC:
148 case MIPS_REVISION_CORID_CORE_FPGA2:
149 case MIPS_REVISION_CORID_CORE_EMUL_MSC:
151 case MIPS_REVISION_CORID_QED_RM5261:
152 case MIPS_REVISION_CORID_CORE_LV:
153 case MIPS_REVISION_CORID_CORE_FPGA:
154 case MIPS_REVISION_CORID_CORE_FPGAR2:
155 data = GT_READ(GT_INTRCAUSE_OFS);
156 printk("GT_INTRCAUSE = %08x\n", data);
157 data = GT_READ(GT_CPUERR_ADDRLO_OFS);
158 datahi = GT_READ(GT_CPUERR_ADDRHI_OFS);
159 printk("GT_CPUERR_ADDR = %02x%08x\n", datahi, data);
161 case MIPS_REVISION_CORID_BONITO64:
162 case MIPS_REVISION_CORID_CORE_20K:
163 case MIPS_REVISION_CORID_CORE_EMUL_BON:
164 data = BONITO_INTISR;
165 printk("BONITO_INTISR = %08x\n", data);
167 printk("BONITO_INTEN = %08x\n", data);
168 data = BONITO_INTPOL;
169 printk("BONITO_INTPOL = %08x\n", data);
170 data = BONITO_INTEDGE;
171 printk("BONITO_INTEDGE = %08x\n", data);
172 data = BONITO_INTSTEER;
173 printk("BONITO_INTSTEER = %08x\n", data);
174 data = BONITO_PCICMD;
175 printk("BONITO_PCICMD = %08x\n", data);
180 die("CoreHi interrupt", regs);
183 void __init arch_init_irq(void)
185 set_except_vector(0, mipsIRQ);