/* * sun4c irq support * * djhr: Hacked out of irq.c into a CPU dependent version. * * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) * Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx) * Copyright (C) 1995 Pete A. Zaitcev (zaitcev@yahoo.com) * Copyright (C) 1996 Dave Redman (djhr@tadpole.co.uk) */ #include <linux/init.h> #include <asm/oplib.h> #include <asm/timer.h> #include <asm/irq.h> #include <asm/io.h> #include "irq.h" /* Sun4c interrupts are typically laid out as follows: * * 1 - Software interrupt, SBUS level 1 * 2 - SBUS level 2 * 3 - ESP SCSI, SBUS level 3 * 4 - Software interrupt * 5 - Lance ethernet, SBUS level 4 * 6 - Software interrupt * 7 - Graphics card, SBUS level 5 * 8 - SBUS level 6 * 9 - SBUS level 7 * 10 - Counter timer * 11 - Floppy * 12 - Zilog uart * 13 - CS4231 audio * 14 - Profiling timer * 15 - NMI * * The interrupt enable bits in the interrupt mask register are * really only used to enable/disable the timer interrupts, and * for signalling software interrupts. There is also a master * interrupt enable bit in this register. * * Interrupts are enabled by setting the SUN4C_INT_* bits, they * are disabled by clearing those bits. */ /* * Bit field defines for the interrupt registers on various * Sparc machines. */ /* The sun4c interrupt register. */ #define SUN4C_INT_ENABLE 0x01 /* Allow interrupts. */ #define SUN4C_INT_E14 0x80 /* Enable level 14 IRQ. */ #define SUN4C_INT_E10 0x20 /* Enable level 10 IRQ. */ #define SUN4C_INT_E8 0x10 /* Enable level 8 IRQ. */ #define SUN4C_INT_E6 0x08 /* Enable level 6 IRQ. */ #define SUN4C_INT_E4 0x04 /* Enable level 4 IRQ. */ #define SUN4C_INT_E1 0x02 /* Enable level 1 IRQ. */ /* * Pointer to the interrupt enable byte * Used by entry.S */ unsigned char __iomem *interrupt_enable; static void sun4c_mask_irq(struct irq_data *data) { unsigned long mask = (unsigned long)data->chip_data; if (mask) { unsigned long flags; local_irq_save(flags); mask = sbus_readb(interrupt_enable) & ~mask; sbus_writeb(mask, interrupt_enable); local_irq_restore(flags); } } static void sun4c_unmask_irq(struct irq_data *data) { unsigned long mask = (unsigned long)data->chip_data; if (mask) { unsigned long flags; local_irq_save(flags); mask = sbus_readb(interrupt_enable) | mask; sbus_writeb(mask, interrupt_enable); local_irq_restore(flags); } } static unsigned int sun4c_startup_irq(struct irq_data *data) { irq_link(data->irq); sun4c_unmask_irq(data); return 0; } static void sun4c_shutdown_irq(struct irq_data *data) { sun4c_mask_irq(data); irq_unlink(data->irq); } static struct irq_chip sun4c_irq = { .name = "sun4c", .irq_startup = sun4c_startup_irq, .irq_shutdown = sun4c_shutdown_irq, .irq_mask = sun4c_mask_irq, .irq_unmask = sun4c_unmask_irq, }; static unsigned int sun4c_build_device_irq(struct platform_device *op, unsigned int real_irq) { unsigned int irq; if (real_irq >= 16) { prom_printf("Bogus sun4c IRQ %u\n", real_irq); prom_halt(); } irq = irq_alloc(real_irq, real_irq); if (irq) { unsigned long mask = 0UL; switch (real_irq) { case 1: mask = SUN4C_INT_E1; break; case 8: mask = SUN4C_INT_E8; break; case 10: mask = SUN4C_INT_E10; break; case 14: mask = SUN4C_INT_E14; break; default: /* All the rest are either always enabled, * or are for signalling software interrupts. */ break; } irq_set_chip_and_handler_name(irq, &sun4c_irq, handle_level_irq, "level"); irq_set_chip_data(irq, (void *)mask); } return irq; } struct sun4c_timer_info { u32 l10_count; u32 l10_limit; u32 l14_count; u32 l14_limit; }; static struct sun4c_timer_info __iomem *sun4c_timers; static void sun4c_clear_clock_irq(void) { sbus_readl(&sun4c_timers->l10_limit); } static void sun4c_load_profile_irq(int cpu, unsigned int limit) { /* Errm.. not sure how to do this.. */ } static void __init sun4c_init_timers(irq_handler_t counter_fn) { const struct linux_prom_irqs *prom_irqs; struct device_node *dp; unsigned int irq; const u32 *addr; int err; dp = of_find_node_by_name(NULL, "counter-timer"); if (!dp) { prom_printf("sun4c_init_timers: Unable to find counter-timer\n"); prom_halt(); } addr = of_get_property(dp, "address", NULL); if (!addr) { prom_printf("sun4c_init_timers: No address property\n"); prom_halt(); } sun4c_timers = (void __iomem *) (unsigned long) addr[0]; prom_irqs = of_get_property(dp, "intr", NULL); of_node_put(dp); if (!prom_irqs) { prom_printf("sun4c_init_timers: No intr property\n"); prom_halt(); } /* Have the level 10 timer tick at 100HZ. We don't touch the * level 14 timer limit since we are letting the prom handle * them until we have a real console driver so L1-A works. */ sbus_writel((((1000000/HZ) + 1) << 10), &sun4c_timers->l10_limit); master_l10_counter = &sun4c_timers->l10_count; irq = sun4c_build_device_irq(NULL, prom_irqs[0].pri); err = request_irq(irq, counter_fn, IRQF_TIMER, "timer", NULL); if (err) { prom_printf("sun4c_init_timers: request_irq() fails with %d\n", err); prom_halt(); } /* disable timer interrupt */ sun4c_mask_irq(irq_get_irq_data(irq)); } #ifdef CONFIG_SMP static void sun4c_nop(void) { } #endif void __init sun4c_init_IRQ(void) { struct device_node *dp; const u32 *addr; dp = of_find_node_by_name(NULL, "interrupt-enable"); if (!dp) { prom_printf("sun4c_init_IRQ: Unable to find interrupt-enable\n"); prom_halt(); } addr = of_get_property(dp, "address", NULL); of_node_put(dp); if (!addr) { prom_printf("sun4c_init_IRQ: No address property\n"); prom_halt(); } interrupt_enable = (void __iomem *) (unsigned long) addr[0]; BTFIXUPSET_CALL(clear_clock_irq, sun4c_clear_clock_irq, BTFIXUPCALL_NORM); BTFIXUPSET_CALL(load_profile_irq, sun4c_load_profile_irq, BTFIXUPCALL_NOP); sparc_irq_config.init_timers = sun4c_init_timers; sparc_irq_config.build_device_irq = sun4c_build_device_irq; #ifdef CONFIG_SMP BTFIXUPSET_CALL(set_cpu_int, sun4c_nop, BTFIXUPCALL_NOP); BTFIXUPSET_CALL(clear_cpu_int, sun4c_nop, BTFIXUPCALL_NOP); BTFIXUPSET_CALL(set_irq_udt, sun4c_nop, BTFIXUPCALL_NOP); #endif sbus_writeb(SUN4C_INT_ENABLE, interrupt_enable); /* Cannot enable interrupts until OBP ticker is disabled. */ }