[mirror_ubuntu-focal-kernel.git] / arch / sparc / kernel / leon_kernel.c

/*
 * 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 <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;

	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;

	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;
}
Commit	Line	Data
5213a780 KE	1	/*
	2	* Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
	3	* Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB
	4	*/
	5
	6	#include <linux/kernel.h>
5213a780 KE	7	#include <linux/errno.h>
5213a780 KE	8	#include <linux/mutex.h>
5213a780 KE	9	#include <linux/of.h>
	10	#include <linux/of_platform.h>
	11	#include <linux/interrupt.h>
	12	#include <linux/of_device.h>
8401707f	13
5213a780 KE	14	#include <asm/oplib.h>
	15	#include <asm/timer.h>
	16	#include <asm/prom.h>
	17	#include <asm/leon.h>
	18	#include <asm/leon_amba.h>
8401707f KE	19	#include <asm/traps.h>
8401707f KE	20	#include <asm/cacheflush.h>
4c6773c3	21	#include <asm/smp.h>
01dae0f0	22	#include <asm/setup.h>
5213a780 KE	23
	24	#include "prom.h"
	25	#include "irq.h"
	26
53aea7ca DH	27	struct leon3_irqctrl_regs_map leon3_irqctrl_regs; / interrupt controller base address */
53aea7ca DH	28	struct leon3_gptimer_regs_map leon3_gptimer_regs; / timer controller base address */
5213a780 KE	29
	30	int leondebug_irq_disable;
	31	int leon_debug_irqout;
	32	static int dummy_master_l10_counter;
7279b82c	33	unsigned long amba_system_id;
d61a38b2	34	static DEFINE_SPINLOCK(leon_irq_lock);
5213a780	35
53aea7ca	36	unsigned long leon3_gptimer_irq; /* interrupt controller irq number */
2791c1a4	37	unsigned long leon3_gptimer_idx; /* Timer Index (0..6) within Timer Core */
2cf95304	38	int leon3_ticker_irq; /* Timer ticker IRQ */
5213a780	39	unsigned int sparc_leon_eirq;
a481b5d0	40	#define LEON_IMASK(cpu) (&leon3_irqctrl_regs->mask[cpu])
4c6773c3 DH	41	#define LEON_IACK (&leon3_irqctrl_regs->iclear)
4c6773c3 DH	42	#define LEON_DO_ACK_HW 1
5213a780	43
4c6773c3 DH	44	/* Return the last ACKed IRQ by the Extended IRQ controller. It has already
	45	* been (automatically) ACKed when the CPU takes the trap.
	46	*/
	47	static inline unsigned int leon_eirq_get(int cpu)
5213a780 KE	48	{
	49	return LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->intid[cpu]) & 0x1f;
	50	}
	51
4c6773c3 DH	52	/* Handle one or multiple IRQs from the extended interrupt controller */
4c6773c3 DH	53	static void leon_handle_ext_irq(unsigned int irq, struct irq_desc *desc)
5213a780	54	{
4c6773c3	55	unsigned int eirq;
01dae0f0	56	int cpu = sparc_leon3_cpuid();
4c6773c3 DH	57
	58	eirq = leon_eirq_get(cpu);
	59	if ((eirq & 0x10) && irq_map[eirq]->irq) /* bit4 tells if IRQ happened */
	60	generic_handle_irq(irq_map[eirq]->irq);
5213a780 KE	61	}
	62
	63	/* The extended IRQ controller has been found, this function registers it */
4c6773c3	64	void leon_eirq_setup(unsigned int eirq)
5213a780	65	{
4c6773c3 DH	66	unsigned long mask, oldmask;
4c6773c3 DH	67	unsigned int veirq;
5213a780	68
4c6773c3 DH	69	if (eirq < 1 \|\| eirq > 0xf) {
	70	printk(KERN_ERR "LEON EXT IRQ NUMBER BAD: %d\n", eirq);
	71	return;
5213a780 KE	72	}
5213a780 KE	73
4c6773c3 DH	74	veirq = leon_build_device_irq(eirq, leon_handle_ext_irq, "extirq", 0);
	75
	76	/*
	77	* Unmask the Extended IRQ, the IRQs routed through the Ext-IRQ
	78	* controller have a mask-bit of their own, so this is safe.
	79	*/
	80	irq_link(veirq);
	81	mask = 1 << eirq;
01dae0f0 DH	82	oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(boot_cpu_id));
01dae0f0 DH	83	LEON3_BYPASS_STORE_PA(LEON_IMASK(boot_cpu_id), (oldmask \| mask));
4c6773c3	84	sparc_leon_eirq = eirq;
5213a780 KE	85	}
	86
	87	static inline unsigned long get_irqmask(unsigned int irq)
	88	{
	89	unsigned long mask;
	90
	91	if (!irq \|\| ((irq > 0xf) && !sparc_leon_eirq)
	92	\|\| ((irq > 0x1f) && sparc_leon_eirq)) {
	93	printk(KERN_ERR
	94	"leon_get_irqmask: false irq number: %d\n", irq);
	95	mask = 0;
	96	} else {
	97	mask = LEON_HARD_INT(irq);
	98	}
	99	return mask;
	100	}
	101
5eb1f4fc DH	102	#ifdef CONFIG_SMP
	103	static int irq_choose_cpu(const struct cpumask *affinity)
	104	{
	105	cpumask_t mask;
	106
0b5f9c00 RR	107	cpumask_and(&mask, cpu_online_mask, affinity);
0b5f9c00 RR	108	if (cpumask_equal(&mask, cpu_online_mask) \|\| cpumask_empty(&mask))
01dae0f0	109	return boot_cpu_id;
5eb1f4fc	110	else
0b5f9c00	111	return cpumask_first(&mask);
5eb1f4fc DH	112	}
5eb1f4fc DH	113	#else
01dae0f0	114	#define irq_choose_cpu(affinity) boot_cpu_id
5eb1f4fc DH	115	#endif
	116
	117	static int leon_set_affinity(struct irq_data data, const struct cpumask dest,
	118	bool force)
	119	{
	120	unsigned long mask, oldmask, flags;
	121	int oldcpu, newcpu;
	122
	123	mask = (unsigned long)data->chip_data;
	124	oldcpu = irq_choose_cpu(data->affinity);
	125	newcpu = irq_choose_cpu(dest);
	126
	127	if (oldcpu == newcpu)
	128	goto out;
	129
	130	/* unmask on old CPU first before enabling on the selected CPU */
	131	spin_lock_irqsave(&leon_irq_lock, flags);
	132	oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(oldcpu));
	133	LEON3_BYPASS_STORE_PA(LEON_IMASK(oldcpu), (oldmask & ~mask));
	134	oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(newcpu));
	135	LEON3_BYPASS_STORE_PA(LEON_IMASK(newcpu), (oldmask \| mask));
	136	spin_unlock_irqrestore(&leon_irq_lock, flags);
	137	out:
	138	return IRQ_SET_MASK_OK;
	139	}
	140
6baa9b20	141	static void leon_unmask_irq(struct irq_data *data)
5213a780	142	{
a481b5d0	143	unsigned long mask, oldmask, flags;
5eb1f4fc	144	int cpu;
6baa9b20 SR	145
6baa9b20 SR	146	mask = (unsigned long)data->chip_data;
5eb1f4fc	147	cpu = irq_choose_cpu(data->affinity);
d61a38b2	148	spin_lock_irqsave(&leon_irq_lock, flags);
5eb1f4fc DH	149	oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu));
5eb1f4fc DH	150	LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask \| mask));
d61a38b2	151	spin_unlock_irqrestore(&leon_irq_lock, flags);
5213a780 KE	152	}
5213a780 KE	153
6baa9b20	154	static void leon_mask_irq(struct irq_data *data)
5213a780	155	{
a481b5d0	156	unsigned long mask, oldmask, flags;
5eb1f4fc	157	int cpu;
6baa9b20 SR	158
6baa9b20 SR	159	mask = (unsigned long)data->chip_data;
5eb1f4fc	160	cpu = irq_choose_cpu(data->affinity);
d61a38b2	161	spin_lock_irqsave(&leon_irq_lock, flags);
5eb1f4fc DH	162	oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu));
5eb1f4fc DH	163	LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask & ~mask));
d61a38b2	164	spin_unlock_irqrestore(&leon_irq_lock, flags);
5213a780 KE	165	}
5213a780 KE	166
6baa9b20 SR	167	static unsigned int leon_startup_irq(struct irq_data *data)
	168	{
	169	irq_link(data->irq);
	170	leon_unmask_irq(data);
	171	return 0;
	172	}
	173
	174	static void leon_shutdown_irq(struct irq_data *data)
	175	{
	176	leon_mask_irq(data);
	177	irq_unlink(data->irq);
	178	}
	179
4c6773c3 DH	180	/* Used by external level sensitive IRQ handlers on the LEON: ACK IRQ ctrl */
	181	static void leon_eoi_irq(struct irq_data *data)
	182	{
	183	unsigned long mask = (unsigned long)data->chip_data;
	184
	185	if (mask & LEON_DO_ACK_HW)
	186	LEON3_BYPASS_STORE_PA(LEON_IACK, mask & ~LEON_DO_ACK_HW);
	187	}
	188
6baa9b20	189	static struct irq_chip leon_irq = {
5eb1f4fc DH	190	.name = "leon",
	191	.irq_startup = leon_startup_irq,
	192	.irq_shutdown = leon_shutdown_irq,
	193	.irq_mask = leon_mask_irq,
	194	.irq_unmask = leon_unmask_irq,
	195	.irq_eoi = leon_eoi_irq,
	196	.irq_set_affinity = leon_set_affinity,
6baa9b20 SR	197	};
6baa9b20 SR	198
4c6773c3 DH	199	/*
	200	* Build a LEON IRQ for the edge triggered LEON IRQ controller:
	201	* Edge (normal) IRQ - handle_simple_irq, ack=DONT-CARE, never ack
	202	* Level IRQ (PCI\|Level-GPIO) - handle_fasteoi_irq, ack=1, ack after ISR
	203	* Per-CPU Edge - handle_percpu_irq, ack=0
	204	*/
	205	unsigned int leon_build_device_irq(unsigned int real_irq,
	206	irq_flow_handler_t flow_handler,
	207	const char *name, int do_ack)
6baa9b20 SR	208	{
	209	unsigned int irq;
	210	unsigned long mask;
	211
	212	irq = 0;
	213	mask = get_irqmask(real_irq);
	214	if (mask == 0)
	215	goto out;
	216
	217	irq = irq_alloc(real_irq, real_irq);
	218	if (irq == 0)
	219	goto out;
	220
4c6773c3 DH	221	if (do_ack)
	222	mask \|= LEON_DO_ACK_HW;
	223
6baa9b20	224	irq_set_chip_and_handler_name(irq, &leon_irq,
4c6773c3	225	flow_handler, name);
6baa9b20 SR	226	irq_set_chip_data(irq, (void *)mask);
	227
	228	out:
	229	return irq;
	230	}
	231
4c6773c3 DH	232	static unsigned int _leon_build_device_irq(struct platform_device *op,
	233	unsigned int real_irq)
	234	{
	235	return leon_build_device_irq(real_irq, handle_simple_irq, "edge", 0);
	236	}
	237
5d07b786 DH	238	void leon_update_virq_handling(unsigned int virq,
	239	irq_flow_handler_t flow_handler,
	240	const char *name, int do_ack)
	241	{
	242	unsigned long mask = (unsigned long)irq_get_chip_data(virq);
	243
	244	mask &= ~LEON_DO_ACK_HW;
	245	if (do_ack)
	246	mask \|= LEON_DO_ACK_HW;
	247
	248	irq_set_chip_and_handler_name(virq, &leon_irq,
	249	flow_handler, name);
	250	irq_set_chip_data(virq, (void *)mask);
	251	}
	252
5213a780 KE	253	void __init leon_init_timers(irq_handler_t counter_fn)
5213a780 KE	254	{
4c6773c3	255	int irq, eirq;
2791c1a4	256	struct device_node rootnp, np, *nnp;
53aea7ca DH	257	struct property *pp;
53aea7ca DH	258	int len;
01dae0f0	259	int icsel;
2791c1a4	260	int ampopts;
6baa9b20	261	int err;
5213a780 KE	262
	263	leondebug_irq_disable = 0;
	264	leon_debug_irqout = 0;
	265	master_l10_counter = (unsigned int *)&dummy_master_l10_counter;
	266	dummy_master_l10_counter = 0;
	267
53aea7ca DH	268	rootnp = of_find_node_by_path("/ambapp0");
	269	if (!rootnp)
	270	goto bad;
7279b82c DH	271
	272	/* Find System ID: GRLIB build ID and optional CHIP ID */
	273	pp = of_find_property(rootnp, "systemid", &len);
	274	if (pp)
	275	amba_system_id = (unsigned long )pp->value;
	276
	277	/* Find IRQMP IRQ Controller Registers base adr otherwise bail out */
53aea7ca	278	np = of_find_node_by_name(rootnp, "GAISLER_IRQMP");
9742e72c DH	279	if (!np) {
	280	np = of_find_node_by_name(rootnp, "01_00d");
	281	if (!np)
	282	goto bad;
	283	}
53aea7ca DH	284	pp = of_find_property(np, "reg", &len);
	285	if (!pp)
	286	goto bad;
	287	leon3_irqctrl_regs = (struct leon3_irqctrl_regs_map *)pp->value;
	288
	289	/* Find GPTIMER Timer Registers base address otherwise bail out. */
2791c1a4 DH	290	nnp = rootnp;
	291	do {
	292	np = of_find_node_by_name(nnp, "GAISLER_GPTIMER");
	293	if (!np) {
	294	np = of_find_node_by_name(nnp, "01_011");
	295	if (!np)
	296	goto bad;
	297	}
	298
	299	ampopts = 0;
	300	pp = of_find_property(np, "ampopts", &len);
	301	if (pp) {
	302	ampopts = (int )pp->value;
	303	if (ampopts == 0) {
	304	/* Skip this instance, resource already
	305	* allocated by other OS */
	306	nnp = np;
	307	continue;
	308	}
	309	}
	310
	311	/* Select Timer-Instance on Timer Core. Default is zero */
	312	leon3_gptimer_idx = ampopts & 0x7;
	313
	314	pp = of_find_property(np, "reg", &len);
	315	if (pp)
	316	leon3_gptimer_regs = (struct leon3_gptimer_regs_map *)
	317	pp->value;
	318	pp = of_find_property(np, "interrupts", &len);
	319	if (pp)
	320	leon3_gptimer_irq = (unsigned int )pp->value;
	321	} while (0);
53aea7ca	322
a481b5d0 DH	323	if (!(leon3_gptimer_regs && leon3_irqctrl_regs && leon3_gptimer_irq))
	324	goto bad;
	325
	326	LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val, 0);
	327	LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld,
	328	(((1000000 / HZ) - 1)));
	329	LEON3_BYPASS_STORE_PA(
2791c1a4	330	&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 0);
5213a780	331
8401707f	332	#ifdef CONFIG_SMP
a481b5d0	333	leon3_ticker_irq = leon3_gptimer_irq + 1 + leon3_gptimer_idx;
8401707f	334
a481b5d0 DH	335	if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) &
	336	(1<<LEON3_GPTIMER_SEPIRQ))) {
	337	printk(KERN_ERR "timer not configured with separate irqs\n");
	338	BUG();
5213a780 KE	339	}
5213a780 KE	340
a481b5d0 DH	341	LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].val,
	342	0);
	343	LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].rld,
	344	(((1000000/HZ) - 1)));
	345	LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
	346	0);
	347	#endif
	348
	349	/*
	350	* The IRQ controller may (if implemented) consist of multiple
	351	* IRQ controllers, each mapped on a 4Kb boundary.
	352	* Each CPU may be routed to different IRQCTRLs, however
	353	* we assume that all CPUs (in SMP system) is routed to the
	354	* same IRQ Controller, and for non-SMP only one IRQCTRL is
	355	* accessed anyway.
	356	* In AMP systems, Linux must run on CPU0 for the time being.
	357	*/
01dae0f0 DH	358	icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[boot_cpu_id/8]);
01dae0f0 DH	359	icsel = (icsel >> ((7 - (boot_cpu_id&0x7)) * 4)) & 0xf;
a481b5d0 DH	360	leon3_irqctrl_regs += icsel;
a481b5d0 DH	361
970def65 DH	362	/* Mask all IRQs on boot-cpu IRQ controller */
	363	LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[boot_cpu_id], 0);
	364
a481b5d0 DH	365	/* Probe extended IRQ controller */
	366	eirq = (LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->mpstatus)
	367	>> 16) & 0xf;
	368	if (eirq != 0)
	369	leon_eirq_setup(eirq);
	370
4c6773c3	371	irq = _leon_build_device_irq(NULL, leon3_gptimer_irq+leon3_gptimer_idx);
6baa9b20	372	err = request_irq(irq, counter_fn, IRQF_TIMER, "timer", NULL);
6baa9b20	373	if (err) {
a481b5d0	374	printk(KERN_ERR "unable to attach timer IRQ%d\n", irq);
5213a780 KE	375	prom_halt();
	376	}
	377
10f0d07c DH	378	#ifdef CONFIG_SMP
	379	{
	380	unsigned long flags;
	381
	382	/*
	383	* In SMP, sun4m adds a IPI handler to IRQ trap handler that
	384	* LEON never must take, sun4d and LEON overwrites the branch
	385	* with a NOP.
	386	*/
	387	local_irq_save(flags);
	388	patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
	389	local_flush_cache_all();
	390	local_irq_restore(flags);
	391	}
	392	#endif
	393
a481b5d0 DH	394	LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
	395	LEON3_GPTIMER_EN \|
	396	LEON3_GPTIMER_RL \|
	397	LEON3_GPTIMER_LD \|
	398	LEON3_GPTIMER_IRQEN);
8401707f KE	399
8401707f KE	400	#ifdef CONFIG_SMP
a481b5d0 DH	401	/* Install per-cpu IRQ handler for broadcasted ticker */
	402	irq = leon_build_device_irq(leon3_ticker_irq, handle_percpu_irq,
	403	"per-cpu", 0);
	404	err = request_irq(irq, leon_percpu_timer_interrupt,
	405	IRQF_PERCPU \| IRQF_TIMER, "ticker",
	406	NULL);
	407	if (err) {
	408	printk(KERN_ERR "unable to attach ticker IRQ%d\n", irq);
	409	prom_halt();
	410	}
2cf95304	411
a481b5d0 DH	412	LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
	413	LEON3_GPTIMER_EN \|
	414	LEON3_GPTIMER_RL \|
	415	LEON3_GPTIMER_LD \|
	416	LEON3_GPTIMER_IRQEN);
8401707f	417	#endif
53aea7ca DH	418	return;
	419	bad:
	420	printk(KERN_ERR "No Timer/irqctrl found\n");
	421	BUG();
	422	return;
5213a780 KE	423	}
	424
	425	void leon_clear_clock_irq(void)
	426	{
	427	}
	428
	429	void leon_load_profile_irq(int cpu, unsigned int limit)
	430	{
	431	BUG();
	432	}
	433
5213a780 KE	434	void __init leon_trans_init(struct device_node *dp)
	435	{
	436	if (strcmp(dp->type, "cpu") == 0 && strcmp(dp->name, "<NULL>") == 0) {
	437	struct property *p;
	438	p = of_find_property(dp, "mid", (void *)0);
	439	if (p) {
	440	int mid;
	441	dp->name = prom_early_alloc(5 + 1);
	442	memcpy(&mid, p->value, p->length);
	443	sprintf((char *)dp->name, "cpu%.2d", mid);
	444	}
	445	}
	446	}
	447
	448	void __initdata (prom_amba_init)(struct device_node dp, struct device_node ***nextp) = 0;
	449
	450	void __init leon_node_init(struct device_node dp, struct device_node **nextp)
	451	{
	452	if (prom_amba_init &&
	453	strcmp(dp->type, "ambapp") == 0 &&
	454	strcmp(dp->name, "ambapp0") == 0) {
	455	prom_amba_init(dp, nextp);
	456	}
	457	}
	458
8401707f KE	459	#ifdef CONFIG_SMP
	460
	461	void leon_set_cpu_int(int cpu, int level)
	462	{
	463	unsigned long mask;
	464	mask = get_irqmask(level);
	465	LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask);
	466	}
	467
	468	static void leon_clear_ipi(int cpu, int level)
	469	{
	470	unsigned long mask;
	471	mask = get_irqmask(level);
	472	LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask<<16);
	473	}
	474
	475	static void leon_set_udt(int cpu)
	476	{
	477	}
	478
	479	void leon_clear_profile_irq(int cpu)
	480	{
	481	}
	482
	483	void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu)
	484	{
	485	unsigned long mask, flags, *addr;
	486	mask = get_irqmask(irq_nr);
d61a38b2	487	spin_lock_irqsave(&leon_irq_lock, flags);
a481b5d0 DH	488	addr = (unsigned long *)LEON_IMASK(cpu);
a481b5d0 DH	489	LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) \| mask));
d61a38b2	490	spin_unlock_irqrestore(&leon_irq_lock, flags);
8401707f KE	491	}
	492
	493	#endif
	494
5213a780 KE	495	void __init leon_init_IRQ(void)
5213a780 KE	496	{
6baa9b20	497	sparc_irq_config.init_timers = leon_init_timers;
4c6773c3	498	sparc_irq_config.build_device_irq = _leon_build_device_irq;
5213a780 KE	499
	500	BTFIXUPSET_CALL(clear_clock_irq, leon_clear_clock_irq,
	501	BTFIXUPCALL_NORM);
	502	BTFIXUPSET_CALL(load_profile_irq, leon_load_profile_irq,
	503	BTFIXUPCALL_NOP);
	504
	505	#ifdef CONFIG_SMP
	506	BTFIXUPSET_CALL(set_cpu_int, leon_set_cpu_int, BTFIXUPCALL_NORM);
	507	BTFIXUPSET_CALL(clear_cpu_int, leon_clear_ipi, BTFIXUPCALL_NORM);
	508	BTFIXUPSET_CALL(set_irq_udt, leon_set_udt, BTFIXUPCALL_NORM);
	509	#endif
	510
	511	}
	512
	513	void __init leon_init(void)
	514	{
ed418502	515	of_pdt_build_more = &leon_node_init;
5213a780	516	}