/* * Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB * Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB */ #include <linux/kernel.h>#include <linux/errno.h>#include <linux/mutex.h>#include <linux/of.h>#include <linux/of_platform.h>#include <linux/interrupt.h>#include <linux/of_device.h>#include <linux/clocksource.h>#include <linux/clockchips.h> #include <asm/oplib.h>#include <asm/timer.h>#include <asm/prom.h>#include <asm/leon.h>#include <asm/leon_amba.h>#include <asm/traps.h>#include <asm/cacheflush.h>#include <asm/smp.h>#include <asm/setup.h> #include "kernel.h"#include "prom.h"#include "irq.h" struct leon3_irqctrl_regs_map *leon3_irqctrl_regs; /* interrupt controller base address */struct leon3_gptimer_regs_map *leon3_gptimer_regs; /* timer controller base address */ int leondebug_irq_disable;int leon_debug_irqout;static int dummy_master_l10_counter;unsigned long amba_system_id;static DEFINE_SPINLOCK(leon_irq_lock); unsigned long leon3_gptimer_irq; /* interrupt controller irq number */unsigned long leon3_gptimer_idx; /* Timer Index (0..6) within Timer Core */unsigned int sparc_leon_eirq;#define LEON_IMASK(cpu) (&leon3_irqctrl_regs->mask[cpu])#define LEON_IACK (&leon3_irqctrl_regs->iclear)#define LEON_DO_ACK_HW 1 /* Return the last ACKed IRQ by the Extended IRQ controller. It has already * been (automatically) ACKed when the CPU takes the trap. */static inline unsigned int leon_eirq_get(int cpu){	return LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->intid[cpu]) & 0x1f;} /* Handle one or multiple IRQs from the extended interrupt controller */static void leon_handle_ext_irq(unsigned int irq, struct irq_desc *desc){	unsigned int eirq;	struct irq_bucket *p;	int cpu = sparc_leon3_cpuid(); 	eirq = leon_eirq_get(cpu);	p = irq_map[eirq];	if ((eirq & 0x10) && p && p->irq) /* bit4 tells if IRQ happened */		generic_handle_irq(p->irq);} /* The extended IRQ controller has been found, this function registers it */void leon_eirq_setup(unsigned int eirq){	unsigned long mask, oldmask;	unsigned int veirq; 	if (eirq < 1 || eirq > 0xf) {		printk(KERN_ERR "LEON EXT IRQ NUMBER BAD: %d\n", eirq);		return;	} 	veirq = leon_build_device_irq(eirq, leon_handle_ext_irq, "extirq", 0); 	/*	 * Unmask the Extended IRQ, the IRQs routed through the Ext-IRQ	 * controller have a mask-bit of their own, so this is safe.	 */	irq_link(veirq);	mask = 1 << eirq;	oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(boot_cpu_id));	LEON3_BYPASS_STORE_PA(LEON_IMASK(boot_cpu_id), (oldmask | mask));	sparc_leon_eirq = eirq;} unsigned long leon_get_irqmask(unsigned int irq){	unsigned long mask; 	if (!irq || ((irq > 0xf) && !sparc_leon_eirq)	    || ((irq > 0x1f) && sparc_leon_eirq)) {		printk(KERN_ERR		       "leon_get_irqmask: false irq number: %d\n", irq);		mask = 0;	} else {		mask = LEON_HARD_INT(irq);	}	return mask;} #ifdef CONFIG_SMPstatic int irq_choose_cpu(const struct cpumask *affinity){	cpumask_t mask; 	cpumask_and(&mask, cpu_online_mask, affinity);	if (cpumask_equal(&mask, cpu_online_mask) || cpumask_empty(&mask))		return boot_cpu_id;	else		return cpumask_first(&mask);}#else#define irq_choose_cpu(affinity) boot_cpu_id#endif static int leon_set_affinity(struct irq_data *data, const struct cpumask *dest,			     bool force){	unsigned long mask, oldmask, flags;	int oldcpu, newcpu; 	mask = (unsigned long)data->chip_data;	oldcpu = irq_choose_cpu(data->affinity);	newcpu = irq_choose_cpu(dest); 	if (oldcpu == newcpu)		goto out; 	/* unmask on old CPU first before enabling on the selected CPU */	spin_lock_irqsave(&leon_irq_lock, flags);	oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(oldcpu));	LEON3_BYPASS_STORE_PA(LEON_IMASK(oldcpu), (oldmask & ~mask));	oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(newcpu));	LEON3_BYPASS_STORE_PA(LEON_IMASK(newcpu), (oldmask | mask));	spin_unlock_irqrestore(&leon_irq_lock, flags);out:	return IRQ_SET_MASK_OK;} static void leon_unmask_irq(struct irq_data *data){	unsigned long mask, oldmask, flags;	int cpu; 	mask = (unsigned long)data->chip_data;	cpu = irq_choose_cpu(data->affinity);	spin_lock_irqsave(&leon_irq_lock, flags);	oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu));	LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask | mask));	spin_unlock_irqrestore(&leon_irq_lock, flags);} static void leon_mask_irq(struct irq_data *data){	unsigned long mask, oldmask, flags;	int cpu; 	mask = (unsigned long)data->chip_data;	cpu = irq_choose_cpu(data->affinity);	spin_lock_irqsave(&leon_irq_lock, flags);	oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu));	LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask & ~mask));	spin_unlock_irqrestore(&leon_irq_lock, flags);} static unsigned int leon_startup_irq(struct irq_data *data){	irq_link(data->irq);	leon_unmask_irq(data);	return 0;} static void leon_shutdown_irq(struct irq_data *data){	leon_mask_irq(data);	irq_unlink(data->irq);} /* Used by external level sensitive IRQ handlers on the LEON: ACK IRQ ctrl */static void leon_eoi_irq(struct irq_data *data){	unsigned long mask = (unsigned long)data->chip_data; 	if (mask & LEON_DO_ACK_HW)		LEON3_BYPASS_STORE_PA(LEON_IACK, mask & ~LEON_DO_ACK_HW);} static struct irq_chip leon_irq = {	.name			= "leon",	.irq_startup		= leon_startup_irq,	.irq_shutdown		= leon_shutdown_irq,	.irq_mask		= leon_mask_irq,	.irq_unmask		= leon_unmask_irq,	.irq_eoi		= leon_eoi_irq,	.irq_set_affinity	= leon_set_affinity,}; /* * Build a LEON IRQ for the edge triggered LEON IRQ controller: *  Edge (normal) IRQ           - handle_simple_irq, ack=DONT-CARE, never ack *  Level IRQ (PCI|Level-GPIO)  - handle_fasteoi_irq, ack=1, ack after ISR *  Per-CPU Edge                - handle_percpu_irq, ack=0 */unsigned int leon_build_device_irq(unsigned int real_irq,				    irq_flow_handler_t flow_handler,				    const char *name, int do_ack){	unsigned int irq;	unsigned long mask;	struct irq_desc *desc; 	irq = 0;	mask = leon_get_irqmask(real_irq);	if (mask == 0)		goto out; 	irq = irq_alloc(real_irq, real_irq);	if (irq == 0)		goto out; 	if (do_ack)		mask |= LEON_DO_ACK_HW; 	desc = irq_to_desc(irq);	if (!desc || !desc->handle_irq || desc->handle_irq == handle_bad_irq) {		irq_set_chip_and_handler_name(irq, &leon_irq,					      flow_handler, name);		irq_set_chip_data(irq, (void *)mask);	} out:	return irq;} static unsigned int _leon_build_device_irq(struct platform_device *op,					   unsigned int real_irq){	return leon_build_device_irq(real_irq, handle_simple_irq, "edge", 0);} void leon_update_virq_handling(unsigned int virq,			      irq_flow_handler_t flow_handler,			      const char *name, int do_ack){	unsigned long mask = (unsigned long)irq_get_chip_data(virq); 	mask &= ~LEON_DO_ACK_HW;	if (do_ack)		mask |= LEON_DO_ACK_HW; 	irq_set_chip_and_handler_name(virq, &leon_irq,				      flow_handler, name);	irq_set_chip_data(virq, (void *)mask);} static u32 leon_cycles_offset(void){	u32 rld, val, off;	rld = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld);	val = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val);	off = rld - val;	return rld - val;} #ifdef CONFIG_SMP /* smp clockevent irq */irqreturn_t leon_percpu_timer_ce_interrupt(int irq, void *unused){	struct clock_event_device *ce;	int cpu = smp_processor_id(); 	leon_clear_profile_irq(cpu); 	if (cpu == boot_cpu_id)		timer_interrupt(irq, NULL); 	ce = &per_cpu(sparc32_clockevent, cpu); 	irq_enter();	if (ce->event_handler)		ce->event_handler(ce);	irq_exit(); 	return IRQ_HANDLED;} #endif /* CONFIG_SMP */ void __init leon_init_timers(void){	int irq, eirq;	struct device_node *rootnp, *np, *nnp;	struct property *pp;	int len;	int icsel;	int ampopts;	int err;	u32 config; 	sparc_config.get_cycles_offset = leon_cycles_offset;	sparc_config.cs_period = 1000000 / HZ;	sparc_config.features |= FEAT_L10_CLOCKSOURCE; #ifndef CONFIG_SMP	sparc_config.features |= FEAT_L10_CLOCKEVENT;#endif 	leondebug_irq_disable = 0;	leon_debug_irqout = 0;	master_l10_counter = (unsigned int *)&dummy_master_l10_counter;	dummy_master_l10_counter = 0; 	rootnp = of_find_node_by_path("/ambapp0");	if (!rootnp)		goto bad; 	/* Find System ID: GRLIB build ID and optional CHIP ID */	pp = of_find_property(rootnp, "systemid", &len);	if (pp)		amba_system_id = *(unsigned long *)pp->value; 	/* Find IRQMP IRQ Controller Registers base adr otherwise bail out */	np = of_find_node_by_name(rootnp, "GAISLER_IRQMP");	if (!np) {		np = of_find_node_by_name(rootnp, "01_00d");		if (!np)			goto bad;	}	pp = of_find_property(np, "reg", &len);	if (!pp)		goto bad;	leon3_irqctrl_regs = *(struct leon3_irqctrl_regs_map **)pp->value; 	/* Find GPTIMER Timer Registers base address otherwise bail out. */	nnp = rootnp;	do {		np = of_find_node_by_name(nnp, "GAISLER_GPTIMER");		if (!np) {			np = of_find_node_by_name(nnp, "01_011");			if (!np)				goto bad;		} 		ampopts = 0;		pp = of_find_property(np, "ampopts", &len);		if (pp) {			ampopts = *(int *)pp->value;			if (ampopts == 0) {				/* Skip this instance, resource already				 * allocated by other OS */				nnp = np;				continue;			}		} 		/* Select Timer-Instance on Timer Core. Default is zero */		leon3_gptimer_idx = ampopts & 0x7; 		pp = of_find_property(np, "reg", &len);		if (pp)			leon3_gptimer_regs = *(struct leon3_gptimer_regs_map **)						pp->value;		pp = of_find_property(np, "interrupts", &len);		if (pp)			leon3_gptimer_irq = *(unsigned int *)pp->value;	} while (0); 	if (!(leon3_gptimer_regs && leon3_irqctrl_regs && leon3_gptimer_irq))		goto bad; 	LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val, 0);	LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld,				(((1000000 / HZ) - 1)));	LEON3_BYPASS_STORE_PA(			&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 0); 	/*	 * The IRQ controller may (if implemented) consist of multiple	 * IRQ controllers, each mapped on a 4Kb boundary.	 * Each CPU may be routed to different IRQCTRLs, however	 * we assume that all CPUs (in SMP system) is routed to the	 * same IRQ Controller, and for non-SMP only one IRQCTRL is	 * accessed anyway.	 * In AMP systems, Linux must run on CPU0 for the time being.	 */	icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[boot_cpu_id/8]);	icsel = (icsel >> ((7 - (boot_cpu_id&0x7)) * 4)) & 0xf;	leon3_irqctrl_regs += icsel; 	/* Mask all IRQs on boot-cpu IRQ controller */	LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[boot_cpu_id], 0); 	/* Probe extended IRQ controller */	eirq = (LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->mpstatus)		>> 16) & 0xf;	if (eirq != 0)		leon_eirq_setup(eirq); #ifdef CONFIG_SMP	{		unsigned long flags; 		/*		 * In SMP, sun4m adds a IPI handler to IRQ trap handler that		 * LEON never must take, sun4d and LEON overwrites the branch		 * with a NOP.		 */		local_irq_save(flags);		patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */		local_ops->cache_all();		local_irq_restore(flags);	}#endif 	config = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config);	if (config & (1 << LEON3_GPTIMER_SEPIRQ))		leon3_gptimer_irq += leon3_gptimer_idx;	else if ((config & LEON3_GPTIMER_TIMERS) > 1)		pr_warn("GPTIMER uses shared irqs, using other timers of the same core will fail.\n"); #ifdef CONFIG_SMP	/* Install per-cpu IRQ handler for broadcasted ticker */	irq = leon_build_device_irq(leon3_gptimer_irq, handle_percpu_irq,				    "per-cpu", 0);	err = request_irq(irq, leon_percpu_timer_ce_interrupt,			  IRQF_PERCPU | IRQF_TIMER, "timer", NULL);#else	irq = _leon_build_device_irq(NULL, leon3_gptimer_irq);	err = request_irq(irq, timer_interrupt, IRQF_TIMER, "timer", NULL);#endif	if (err) {		pr_err("Unable to attach timer IRQ%d\n", irq);		prom_halt();	}	LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,			      LEON3_GPTIMER_EN |			      LEON3_GPTIMER_RL |			      LEON3_GPTIMER_LD |			      LEON3_GPTIMER_IRQEN);	return;bad:	printk(KERN_ERR "No Timer/irqctrl found\n");	BUG();	return;} static void leon_clear_clock_irq(void){} static void leon_load_profile_irq(int cpu, unsigned int limit){} void __init leon_trans_init(struct device_node *dp){	if (strcmp(dp->type, "cpu") == 0 && strcmp(dp->name, "<NULL>") == 0) {		struct property *p;		p = of_find_property(dp, "mid", (void *)0);		if (p) {			int mid;			dp->name = prom_early_alloc(5 + 1);			memcpy(&mid, p->value, p->length);			sprintf((char *)dp->name, "cpu%.2d", mid);		}	}} #ifdef CONFIG_SMPvoid leon_clear_profile_irq(int cpu){} void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu){	unsigned long mask, flags, *addr;	mask = leon_get_irqmask(irq_nr);	spin_lock_irqsave(&leon_irq_lock, flags);	addr = (unsigned long *)LEON_IMASK(cpu);	LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | mask));	spin_unlock_irqrestore(&leon_irq_lock, flags);} #endif void __init leon_init_IRQ(void){	sparc_config.init_timers      = leon_init_timers;	sparc_config.build_device_irq = _leon_build_device_irq;	sparc_config.clock_rate       = 1000000;	sparc_config.clear_clock_irq  = leon_clear_clock_irq;	sparc_config.load_profile_irq = leon_load_profile_irq;}