text: /*
   * 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/module.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 <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 "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 */
  int leon3_ticker_irq; /* Timer ticker IRQ */
  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;
  	int cpu = sparc_leon3_cpuid();
  
  	eirq = leon_eirq_get(cpu);
  	if ((eirq & 0x10) && irq_map[eirq]->irq) /* bit4 tells if IRQ happened */
  		generic_handle_irq(irq_map[eirq]->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;
  }
  
  static inline unsigned long 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_SMP
  static int irq_choose_cpu(const struct cpumask *affinity)
  {
  	cpumask_t mask;
  
  	cpus_and(mask, cpu_online_map, *affinity);
  	if (cpus_equal(mask, cpu_online_map) || cpus_empty(mask))
  		return boot_cpu_id;
  	else
  		return first_cpu(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;
  
  	irq = 0;
  	mask = 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;
  
  	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);
  }
  
  void __init leon_init_timers(irq_handler_t counter_fn)
  {
  	int irq, eirq;
  	struct device_node *rootnp, *np, *nnp;
  	struct property *pp;
  	int len;
  	int icsel;
  	int ampopts;
  	int err;
  
  	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);
  
  #ifdef CONFIG_SMP
  	leon3_ticker_irq = leon3_gptimer_irq + 1 + leon3_gptimer_idx;
  
  	if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) &
  	      (1<<LEON3_GPTIMER_SEPIRQ))) {
  		printk(KERN_ERR "timer not configured with separate irqs\n");
  		BUG();
  	}
  
  	LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].val,
  				0);
  	LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].rld,
  				(((1000000/HZ) - 1)));
  	LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
  				0);
  #endif
  
  	/*
  	 * 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);
  
  	irq = _leon_build_device_irq(NULL, leon3_gptimer_irq+leon3_gptimer_idx);
  	err = request_irq(irq, counter_fn, IRQF_TIMER, "timer", NULL);
  	if (err) {
  		printk(KERN_ERR "unable to attach timer IRQ%d\n", irq);
  		prom_halt();
  	}
  
  #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_flush_cache_all();
  		local_irq_restore(flags);
  	}
  #endif
  
  	LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
  			      LEON3_GPTIMER_EN |
  			      LEON3_GPTIMER_RL |
  			      LEON3_GPTIMER_LD |
  			      LEON3_GPTIMER_IRQEN);
  
  #ifdef CONFIG_SMP
  	/* Install per-cpu IRQ handler for broadcasted ticker */
  	irq = leon_build_device_irq(leon3_ticker_irq, handle_percpu_irq,
  				    "per-cpu", 0);
  	err = request_irq(irq, leon_percpu_timer_interrupt,
  			  IRQF_PERCPU | IRQF_TIMER, "ticker",
  			  NULL);
  	if (err) {
  		printk(KERN_ERR "unable to attach ticker IRQ%d\n", irq);
  		prom_halt();
  	}
  
  	LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
  			      LEON3_GPTIMER_EN |
  			      LEON3_GPTIMER_RL |
  			      LEON3_GPTIMER_LD |
  			      LEON3_GPTIMER_IRQEN);
  #endif
  	return;
  bad:
  	printk(KERN_ERR "No Timer/irqctrl found\n");
  	BUG();
  	return;
  }
  
  void leon_clear_clock_irq(void)
  {
  }
  
  void leon_load_profile_irq(int cpu, unsigned int limit)
  {
  	BUG();
  }
  
  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);
  		}
  	}
  }
  
  void __initdata (*prom_amba_init)(struct device_node *dp, struct device_node ***nextp) = 0;
  
  void __init leon_node_init(struct device_node *dp, struct device_node ***nextp)
  {
  	if (prom_amba_init &&
  	    strcmp(dp->type, "ambapp") == 0 &&
  	    strcmp(dp->name, "ambapp0") == 0) {
  		prom_amba_init(dp, nextp);
  	}
  }
  
  #ifdef CONFIG_SMP
  
  void leon_set_cpu_int(int cpu, int level)
  {
  	unsigned long mask;
  	mask = get_irqmask(level);
  	LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask);
  }
  
  static void leon_clear_ipi(int cpu, int level)
  {
  	unsigned long mask;
  	mask = get_irqmask(level);
  	LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask<<16);
  }
  
  static void leon_set_udt(int cpu)
  {
  }
  
  void leon_clear_profile_irq(int cpu)
  {
  }
  
  void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu)
  {
  	unsigned long mask, flags, *addr;
  	mask = 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_irq_config.init_timers      = leon_init_timers;
  	sparc_irq_config.build_device_irq = _leon_build_device_irq;
  
  	BTFIXUPSET_CALL(clear_clock_irq, leon_clear_clock_irq,
  			BTFIXUPCALL_NORM);
  	BTFIXUPSET_CALL(load_profile_irq, leon_load_profile_irq,
  			BTFIXUPCALL_NOP);
  
  #ifdef CONFIG_SMP
  	BTFIXUPSET_CALL(set_cpu_int, leon_set_cpu_int, BTFIXUPCALL_NORM);
  	BTFIXUPSET_CALL(clear_cpu_int, leon_clear_ipi, BTFIXUPCALL_NORM);
  	BTFIXUPSET_CALL(set_irq_udt, leon_set_udt, BTFIXUPCALL_NORM);
  #endif
  
  }
  
  void __init leon_init(void)
  {
  	of_pdt_build_more = &leon_node_init;
  }
  