/* * * Copyright (C) 2005 Embedded Alley Solutions, Inc * Ported to 2.6. * * Per Hallsmark, per.hallsmark@mvista.com * Copyright (C) 2000, 2001 MIPS Technologies, Inc. * Copyright (C) 2001 Ralf Baechle * * Cleaned up and bug fixing: Pete Popov, ppopov@embeddedalley.com * * This program is free software; you can distribute it and/or modify it * under the terms of the GNU General Public License (Version 2) as * published by the Free Software Foundation. * * This program is distributed in the hope 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. * */ #include #include #include #include #include #include #include #include #include #include #include /* default prio for interrupts */ /* first one is a no-no so therefore always prio 0 (disabled) */ static char gic_prio[PNX8550_INT_GIC_TOTINT] = { 0, 1, 1, 1, 1, 15, 1, 1, 1, 1, // 0 - 9 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 10 - 19 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 20 - 29 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 30 - 39 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 40 - 49 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, // 50 - 59 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 60 - 69 1 // 70 }; static void hw0_irqdispatch(int irq) { /* find out which interrupt */ irq = PNX8550_GIC_VECTOR_0 >> 3; if (irq == 0) { printk("hw0_irqdispatch: irq 0, spurious interrupt?\n"); return; } do_IRQ(PNX8550_INT_GIC_MIN + irq); } static void timer_irqdispatch(int irq) { irq = (0x01c0 & read_c0_config7()) >> 6; if (unlikely(irq == 0)) { printk("timer_irqdispatch: irq 0, spurious interrupt?\n"); return; } if (irq & 0x1) do_IRQ(PNX8550_INT_TIMER1); if (irq & 0x2) do_IRQ(PNX8550_INT_TIMER2); if (irq & 0x4) do_IRQ(PNX8550_INT_TIMER3); } asmlinkage void plat_irq_dispatch(void) { unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM; if (pending & STATUSF_IP2) hw0_irqdispatch(2); else if (pending & STATUSF_IP7) { if (read_c0_config7() & 0x01c0) timer_irqdispatch(7); } else spurious_interrupt(); } static inline void modify_cp0_intmask(unsigned clr_mask, unsigned set_mask) { unsigned long status = read_c0_status(); status &= ~((clr_mask & 0xFF) << 8); status |= (set_mask & 0xFF) << 8; write_c0_status(status); } static inline void mask_gic_int(unsigned int irq_nr) { /* interrupt disabled, bit 26(WE_ENABLE)=1 and bit 16(enable)=0 */ PNX8550_GIC_REQ(irq_nr) = 1<<28; /* set priority to 0 */ } static inline void unmask_gic_int(unsigned int irq_nr) { /* set prio mask to lower four bits and enable interrupt */ PNX8550_GIC_REQ(irq_nr) = (1<<26 | 1<<16) | (1<<28) | gic_prio[irq_nr]; } static inline void mask_irq(struct irq_data *d) { unsigned int irq_nr = d->irq; if ((PNX8550_INT_CP0_MIN <= irq_nr) && (irq_nr <= PNX8550_INT_CP0_MAX)) { modify_cp0_intmask(1 << irq_nr, 0); } else if ((PNX8550_INT_GIC_MIN <= irq_nr) && (irq_nr <= PNX8550_INT_GIC_MAX)) { mask_gic_int(irq_nr - PNX8550_INT_GIC_MIN); } else if ((PNX8550_INT_TIMER_MIN <= irq_nr) && (irq_nr <= PNX8550_INT_TIMER_MAX)) { modify_cp0_intmask(1 << 7, 0); } else { printk("mask_irq: irq %d doesn't exist!\n", irq_nr); } } static inline void unmask_irq(struct irq_data *d) { unsigned int irq_nr = d->irq; if ((PNX8550_INT_CP0_MIN <= irq_nr) && (irq_nr <= PNX8550_INT_CP0_MAX)) { modify_cp0_intmask(0, 1 << irq_nr); } else if ((PNX8550_INT_GIC_MIN <= irq_nr) && (irq_nr <= PNX8550_INT_GIC_MAX)) { unmask_gic_int(irq_nr - PNX8550_INT_GIC_MIN); } else if ((PNX8550_INT_TIMER_MIN <= irq_nr) && (irq_nr <= PNX8550_INT_TIMER_MAX)) { modify_cp0_intmask(0, 1 << 7); } else { printk("mask_irq: irq %d doesn't exist!\n", irq_nr); } } int pnx8550_set_gic_priority(int irq, int priority) { int gic_irq = irq-PNX8550_INT_GIC_MIN; int prev_priority = PNX8550_GIC_REQ(gic_irq) & 0xf; gic_prio[gic_irq] = priority; PNX8550_GIC_REQ(gic_irq) |= (0x10000000 | gic_prio[gic_irq]); return prev_priority; } static struct irq_chip level_irq_type = { .name = "PNX Level IRQ", .irq_mask = mask_irq, .irq_unmask = unmask_irq, }; static struct irqaction gic_action = { .handler = no_action, .flags = IRQF_NO_THREAD, .name = "GIC", }; static struct irqaction timer_action = { .handler = no_action, .flags = IRQF_TIMER, .name = "Timer", }; void __init arch_init_irq(void) { int i; int configPR; for (i = 0; i < PNX8550_INT_CP0_TOTINT; i++) irq_set_chip_and_handler(i, &level_irq_type, handle_level_irq); /* init of GIC/IPC interrupts */ /* should be done before cp0 since cp0 init enables the GIC int */ for (i = PNX8550_INT_GIC_MIN; i <= PNX8550_INT_GIC_MAX; i++) { int gic_int_line = i - PNX8550_INT_GIC_MIN; if (gic_int_line == 0 ) continue; // don't fiddle with int 0 /* * enable change of TARGET, ENABLE and ACTIVE_LOW bits * set TARGET 0 to route through hw0 interrupt * set ACTIVE_LOW 0 active high (correct?) * * We really should setup an interrupt description table * to do this nicely. * Note, PCI INTA is active low on the bus, but inverted * in the GIC, so to us it's active high. */ PNX8550_GIC_REQ(i - PNX8550_INT_GIC_MIN) = 0x1E000000; /* mask/priority is still 0 so we will not get any * interrupts until it is unmasked */ irq_set_chip_and_handler(i, &level_irq_type, handle_level_irq); } /* Priority level 0 */ PNX8550_GIC_PRIMASK_0 = PNX8550_GIC_PRIMASK_1 = 0; /* Set int vector table address */ PNX8550_GIC_VECTOR_0 = PNX8550_GIC_VECTOR_1 = 0; irq_set_chip_and_handler(MIPS_CPU_GIC_IRQ, &level_irq_type, handle_level_irq); setup_irq(MIPS_CPU_GIC_IRQ, &gic_action); /* init of Timer interrupts */ for (i = PNX8550_INT_TIMER_MIN; i <= PNX8550_INT_TIMER_MAX; i++) irq_set_chip_and_handler(i, &level_irq_type, handle_level_irq); /* Stop Timer 1-3 */ configPR = read_c0_config7(); configPR |= 0x00000038; write_c0_config7(configPR); irq_set_chip_and_handler(MIPS_CPU_TIMER_IRQ, &level_irq_type, handle_level_irq); setup_irq(MIPS_CPU_TIMER_IRQ, &timer_action); } EXPORT_SYMBOL(pnx8550_set_gic_priority);