arch/sparc/kernel/leon_kernel.c - linux - Git at Google

 /*
  * 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/slab.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 "prom.h"
 #include "irq.h"

 struct leon3_irqctrl_regs_map *leon3_irqctrl_regs; /* interrupt controller base address, initialized by amba_init() */
 struct leon3_gptimer_regs_map *leon3_gptimer_regs; /* timer controller base address, initialized by amba_init() */
 struct amba_apb_device leon_percpu_timer_dev[16];

 int leondebug_irq_disable;
 int leon_debug_irqout;
 static int dummy_master_l10_counter;

 unsigned long leon3_gptimer_irq; /* interrupt controller irq number, initialized by amba_init() */
 unsigned int sparc_leon_eirq;
 #define LEON_IMASK ((&leon3_irqctrl_regs->mask[0]))

 /* Return the IRQ of the pending IRQ on the extended IRQ controller */
 int sparc_leon_eirq_get(int eirq, int cpu)
 {
 	return LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->intid[cpu]) & 0x1f;
 }

 irqreturn_t sparc_leon_eirq_isr(int dummy, void *dev_id)
 {
 	printk(KERN_ERR "sparc_leon_eirq_isr: ERROR EXTENDED IRQ\n");
 	return IRQ_HANDLED;
 }

 /* The extended IRQ controller has been found, this function registers it */
 void sparc_leon_eirq_register(int eirq)
 {
 	int irq;

 	/* Register a "BAD" handler for this interrupt, it should never happen */
 	irq = request_irq(eirq, sparc_leon_eirq_isr,
 			  (IRQF_DISABLED | SA_STATIC_ALLOC), "extirq", NULL);

 	if (irq) {
 		printk(KERN_ERR
 		       "sparc_leon_eirq_register: unable to attach IRQ%d\n",
 		       eirq);
 	} else {
 		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;
 }

 static void leon_enable_irq(unsigned int irq_nr)
 {
 	unsigned long mask, flags;
 	mask = get_irqmask(irq_nr);
 	local_irq_save(flags);
 	LEON3_BYPASS_STORE_PA(LEON_IMASK,
 			      (LEON3_BYPASS_LOAD_PA(LEON_IMASK) | (mask)));
 	local_irq_restore(flags);
 }

 static void leon_disable_irq(unsigned int irq_nr)
 {
 	unsigned long mask, flags;
 	mask = get_irqmask(irq_nr);
 	local_irq_save(flags);
 	LEON3_BYPASS_STORE_PA(LEON_IMASK,
 			      (LEON3_BYPASS_LOAD_PA(LEON_IMASK) & ~(mask)));
 	local_irq_restore(flags);

 }

 void __init leon_init_timers(irq_handler_t counter_fn)
 {
 	int irq;

 	leondebug_irq_disable = 0;
 	leon_debug_irqout = 0;
 	master_l10_counter = (unsigned int *)&dummy_master_l10_counter;
 	dummy_master_l10_counter = 0;

 	if (leon3_gptimer_regs && leon3_irqctrl_regs) {
 		LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].val, 0);
 		LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].rld,
 				      (((1000000 / 100) - 1)));
 		LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].ctrl, 0);

 #ifdef CONFIG_SMP
 		leon_percpu_timer_dev[0].start = (int)leon3_gptimer_regs;
 		leon_percpu_timer_dev[0].irq = leon3_gptimer_irq+1;

 		if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) &
 		      (1<<LEON3_GPTIMER_SEPIRQ))) {
 			prom_printf("irq timer not configured with seperate irqs \n");
 			BUG();
 		}

 		LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].val, 0);
 		LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].rld, (((1000000/100) - 1)));
 		LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].ctrl, 0);
 # endif

 	} else {
 		printk(KERN_ERR "No Timer/irqctrl found\n");
 		BUG();
 	}

 	irq = request_irq(leon3_gptimer_irq,
 			  counter_fn,
 			  (IRQF_DISABLED | SA_STATIC_ALLOC), "timer", NULL);

 	if (irq) {
 		printk(KERN_ERR "leon_time_init: unable to attach IRQ%d\n",
 		       LEON_INTERRUPT_TIMER1);
 		prom_halt();
 	}

 # ifdef CONFIG_SMP
 	{
 		unsigned long flags;
 		struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (leon_percpu_timer_dev[0].irq - 1)];

 		/* For SMP we use the level 14 ticker, however the bootup code
 		 * has copied the firmwares level 14 vector into boot cpu's
 		 * trap table, we must fix this now or we get squashed.
 		 */
 		local_irq_save(flags);

 		patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */

 		/* Adjust so that we jump directly to smpleon_ticker */
 		trap_table->inst_three += smpleon_ticker - real_irq_entry;

 		local_flush_cache_all();
 		local_irq_restore(flags);
 	}
 # endif

 	if (leon3_gptimer_regs) {
 		LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].ctrl,
 				      LEON3_GPTIMER_EN |
 				      LEON3_GPTIMER_RL |
 				      LEON3_GPTIMER_LD | LEON3_GPTIMER_IRQEN);

 #ifdef CONFIG_SMP
 		LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].ctrl,
 				      LEON3_GPTIMER_EN |
 				      LEON3_GPTIMER_RL |
 				      LEON3_GPTIMER_LD |
 				      LEON3_GPTIMER_IRQEN);
 #endif

 	}
 }

 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);
 	local_irq_save(flags);
 	addr = (unsigned long *)&(leon3_irqctrl_regs->mask[cpu]);
 	LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | (mask)));
 	local_irq_restore(flags);
 }

 #endif

 void __init leon_init_IRQ(void)
 {
 	sparc_init_timers = leon_init_timers;

 	BTFIXUPSET_CALL(enable_irq, leon_enable_irq, BTFIXUPCALL_NORM);
 	BTFIXUPSET_CALL(disable_irq, leon_disable_irq, BTFIXUPCALL_NORM);
 	BTFIXUPSET_CALL(enable_pil_irq, leon_enable_irq, BTFIXUPCALL_NORM);
 	BTFIXUPSET_CALL(disable_pil_irq, leon_disable_irq, BTFIXUPCALL_NORM);

 	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)
 {
 	prom_build_more = &leon_node_init;
 }
	/*
	* 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/slab.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 "prom.h"
	#include "irq.h"

	struct leon3_irqctrl_regs_map leon3_irqctrl_regs; / interrupt controller base address, initialized by amba_init() */
	struct leon3_gptimer_regs_map leon3_gptimer_regs; / timer controller base address, initialized by amba_init() */
	struct amba_apb_device leon_percpu_timer_dev[16];

	int leondebug_irq_disable;
	int leon_debug_irqout;
	static int dummy_master_l10_counter;

	unsigned long leon3_gptimer_irq; /* interrupt controller irq number, initialized by amba_init() */
	unsigned int sparc_leon_eirq;
	#define LEON_IMASK ((&leon3_irqctrl_regs->mask[0]))

	/* Return the IRQ of the pending IRQ on the extended IRQ controller */
	int sparc_leon_eirq_get(int eirq, int cpu)
	{
	return LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->intid[cpu]) & 0x1f;
	}

	irqreturn_t sparc_leon_eirq_isr(int dummy, void *dev_id)
	{
	printk(KERN_ERR "sparc_leon_eirq_isr: ERROR EXTENDED IRQ\n");
	return IRQ_HANDLED;
	}

	/* The extended IRQ controller has been found, this function registers it */
	void sparc_leon_eirq_register(int eirq)
	{
	int irq;

	/* Register a "BAD" handler for this interrupt, it should never happen */
	irq = request_irq(eirq, sparc_leon_eirq_isr,
	(IRQF_DISABLED \| SA_STATIC_ALLOC), "extirq", NULL);

	if (irq) {
	printk(KERN_ERR
	"sparc_leon_eirq_register: unable to attach IRQ%d\n",
	eirq);
	} else {
	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;
	}

	static void leon_enable_irq(unsigned int irq_nr)
	{
	unsigned long mask, flags;
	mask = get_irqmask(irq_nr);
	local_irq_save(flags);
	LEON3_BYPASS_STORE_PA(LEON_IMASK,
	(LEON3_BYPASS_LOAD_PA(LEON_IMASK) \| (mask)));
	local_irq_restore(flags);
	}

	static void leon_disable_irq(unsigned int irq_nr)
	{
	unsigned long mask, flags;
	mask = get_irqmask(irq_nr);
	local_irq_save(flags);
	LEON3_BYPASS_STORE_PA(LEON_IMASK,
	(LEON3_BYPASS_LOAD_PA(LEON_IMASK) & ~(mask)));
	local_irq_restore(flags);

	}

	void __init leon_init_timers(irq_handler_t counter_fn)
	{
	int irq;

	leondebug_irq_disable = 0;
	leon_debug_irqout = 0;
	master_l10_counter = (unsigned int *)&dummy_master_l10_counter;
	dummy_master_l10_counter = 0;

	if (leon3_gptimer_regs && leon3_irqctrl_regs) {
	LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].val, 0);
	LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].rld,
	(((1000000 / 100) - 1)));
	LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].ctrl, 0);

	#ifdef CONFIG_SMP
	leon_percpu_timer_dev[0].start = (int)leon3_gptimer_regs;
	leon_percpu_timer_dev[0].irq = leon3_gptimer_irq+1;

	if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) &
	(1<<LEON3_GPTIMER_SEPIRQ))) {
	prom_printf("irq timer not configured with seperate irqs \n");
	BUG();
	}

	LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].val, 0);
	LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].rld, (((1000000/100) - 1)));
	LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].ctrl, 0);
	# endif

	} else {
	printk(KERN_ERR "No Timer/irqctrl found\n");
	BUG();
	}

	irq = request_irq(leon3_gptimer_irq,
	counter_fn,
	(IRQF_DISABLED \| SA_STATIC_ALLOC), "timer", NULL);

	if (irq) {
	printk(KERN_ERR "leon_time_init: unable to attach IRQ%d\n",
	LEON_INTERRUPT_TIMER1);
	prom_halt();
	}

	# ifdef CONFIG_SMP
	{
	unsigned long flags;
	struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (leon_percpu_timer_dev[0].irq - 1)];

	/* For SMP we use the level 14 ticker, however the bootup code
	* has copied the firmwares level 14 vector into boot cpu's
	* trap table, we must fix this now or we get squashed.
	*/
	local_irq_save(flags);

	patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */

	/* Adjust so that we jump directly to smpleon_ticker */
	trap_table->inst_three += smpleon_ticker - real_irq_entry;

	local_flush_cache_all();
	local_irq_restore(flags);
	}
	# endif

	if (leon3_gptimer_regs) {
	LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].ctrl,
	LEON3_GPTIMER_EN \|
	LEON3_GPTIMER_RL \|
	LEON3_GPTIMER_LD \| LEON3_GPTIMER_IRQEN);

	#ifdef CONFIG_SMP
	LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].ctrl,
	LEON3_GPTIMER_EN \|
	LEON3_GPTIMER_RL \|
	LEON3_GPTIMER_LD \|
	LEON3_GPTIMER_IRQEN);
	#endif

	}
	}

	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);
	local_irq_save(flags);
	addr = (unsigned long *)&(leon3_irqctrl_regs->mask[cpu]);
	LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) \| (mask)));
	local_irq_restore(flags);
	}

	#endif

	void __init leon_init_IRQ(void)
	{
	sparc_init_timers = leon_init_timers;

	BTFIXUPSET_CALL(enable_irq, leon_enable_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(disable_irq, leon_disable_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(enable_pil_irq, leon_enable_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(disable_pil_irq, leon_disable_irq, BTFIXUPCALL_NORM);

	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)
	{
	prom_build_more = &leon_node_init;
	}