cregit-Linux how code gets into the kernel

Release 4.14 arch/sparc/kernel/sun4m_irq.c

Directory: arch/sparc/kernel
// SPDX-License-Identifier: GPL-2.0
/*
 * sun4m 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/slab.h>
#include <linux/sched/debug.h>

#include <asm/timer.h>
#include <asm/traps.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/cacheflush.h>

#include "irq.h"
#include "kernel.h"

/* Sample sun4m IRQ layout:
 *
 * 0x22 - Power
 * 0x24 - ESP SCSI
 * 0x26 - Lance ethernet
 * 0x2b - Floppy
 * 0x2c - Zilog uart
 * 0x32 - SBUS level 0
 * 0x33 - Parallel port, SBUS level 1
 * 0x35 - SBUS level 2
 * 0x37 - SBUS level 3
 * 0x39 - Audio, Graphics card, SBUS level 4
 * 0x3b - SBUS level 5
 * 0x3d - SBUS level 6
 *
 * Each interrupt source has a mask bit in the interrupt registers.
 * When the mask bit is set, this blocks interrupt deliver.  So you
 * clear the bit to enable the interrupt.
 *
 * Interrupts numbered less than 0x10 are software triggered interrupts
 * and unused by Linux.
 *
 * Interrupt level assignment on sun4m:
 *
 *      level           source
 * ------------------------------------------------------------
 *        1             softint-1
 *        2             softint-2, VME/SBUS level 1
 *        3             softint-3, VME/SBUS level 2
 *        4             softint-4, onboard SCSI
 *        5             softint-5, VME/SBUS level 3
 *        6             softint-6, onboard ETHERNET
 *        7             softint-7, VME/SBUS level 4
 *        8             softint-8, onboard VIDEO
 *        9             softint-9, VME/SBUS level 5, Module Interrupt
 *       10             softint-10, system counter/timer
 *       11             softint-11, VME/SBUS level 6, Floppy
 *       12             softint-12, Keyboard/Mouse, Serial
 *       13             softint-13, VME/SBUS level 7, ISDN Audio
 *       14             softint-14, per-processor counter/timer
 *       15             softint-15, Asynchronous Errors (broadcast)
 *
 * Each interrupt source is masked distinctly in the sun4m interrupt
 * registers.  The PIL level alone is therefore ambiguous, since multiple
 * interrupt sources map to a single PIL.
 *
 * This ambiguity is resolved in the 'intr' property for device nodes
 * in the OF device tree.  Each 'intr' property entry is composed of
 * two 32-bit words.  The first word is the IRQ priority value, which
 * is what we're intersted in.  The second word is the IRQ vector, which
 * is unused.
 *
 * The low 4 bits of the IRQ priority indicate the PIL, and the upper
 * 4 bits indicate onboard vs. SBUS leveled vs. VME leveled.  0x20
 * means onboard, 0x30 means SBUS leveled, and 0x40 means VME leveled.
 *
 * For example, an 'intr' IRQ priority value of 0x24 is onboard SCSI
 * whereas a value of 0x33 is SBUS level 2.  Here are some sample
 * 'intr' property IRQ priority values from ss4, ss5, ss10, ss20, and
 * Tadpole S3 GX systems.
 *
 * esp:         0x24    onboard ESP SCSI
 * le:          0x26    onboard Lance ETHERNET
 * p9100:       0x32    SBUS level 1 P9100 video
 * bpp:         0x33    SBUS level 2 BPP parallel port device
 * DBRI:        0x39    SBUS level 5 DBRI ISDN audio
 * SUNW,leo:    0x39    SBUS level 5 LEO video
 * pcmcia:      0x3b    SBUS level 6 PCMCIA controller
 * uctrl:       0x3b    SBUS level 6 UCTRL device
 * modem:       0x3d    SBUS level 7 MODEM
 * zs:          0x2c    onboard keyboard/mouse/serial
 * floppy:      0x2b    onboard Floppy
 * power:       0x22    onboard power device (XXX unknown mask bit XXX)
 */


/* Code in entry.S needs to get at these register mappings.  */

struct sun4m_irq_percpu __iomem *sun4m_irq_percpu[SUN4M_NCPUS];

struct sun4m_irq_global __iomem *sun4m_irq_global;


struct sun4m_handler_data {
	
bool    percpu;
	
long    mask;
};

/* Dave Redman (djhr@tadpole.co.uk)
 * The sun4m interrupt registers.
 */

#define SUN4M_INT_ENABLE	0x80000000

#define SUN4M_INT_E14		0x00000080

#define SUN4M_INT_E10		0x00080000


#define	SUN4M_INT_MASKALL	0x80000000	  
/* mask all interrupts */

#define	SUN4M_INT_MODULE_ERR	0x40000000	  
/* module error */

#define	SUN4M_INT_M2S_WRITE_ERR	0x20000000	  
/* write buffer error */

#define	SUN4M_INT_ECC_ERR	0x10000000	  
/* ecc memory error */

#define	SUN4M_INT_VME_ERR	0x08000000	  
/* vme async error */

#define	SUN4M_INT_FLOPPY	0x00400000	  
/* floppy disk */

#define	SUN4M_INT_MODULE	0x00200000	  
/* module interrupt */

#define	SUN4M_INT_VIDEO		0x00100000	  
/* onboard video */

#define	SUN4M_INT_REALTIME	0x00080000	  
/* system timer */

#define	SUN4M_INT_SCSI		0x00040000	  
/* onboard scsi */

#define	SUN4M_INT_AUDIO		0x00020000	  
/* audio/isdn */

#define	SUN4M_INT_ETHERNET	0x00010000	  
/* onboard ethernet */

#define	SUN4M_INT_SERIAL	0x00008000	  
/* serial ports */

#define	SUN4M_INT_KBDMS		0x00004000	  
/* keyboard/mouse */

#define	SUN4M_INT_SBUSBITS	0x00003F80	  
/* sbus int bits */

#define	SUN4M_INT_VMEBITS	0x0000007F	  
/* vme int bits */


#define	SUN4M_INT_ERROR		(SUN4M_INT_MODULE_ERR |    \
                                 SUN4M_INT_M2S_WRITE_ERR | \
                                 SUN4M_INT_ECC_ERR |       \
                                 SUN4M_INT_VME_ERR)


#define SUN4M_INT_SBUS(x)	(1 << (x+7))

#define SUN4M_INT_VME(x)	(1 << (x))

/* Interrupt levels used by OBP */

#define	OBP_INT_LEVEL_SOFT	0x10

#define	OBP_INT_LEVEL_ONBOARD	0x20

#define	OBP_INT_LEVEL_SBUS	0x30

#define	OBP_INT_LEVEL_VME	0x40


#define SUN4M_TIMER_IRQ         (OBP_INT_LEVEL_ONBOARD | 10)

#define SUN4M_PROFILE_IRQ       (OBP_INT_LEVEL_ONBOARD | 14)


static unsigned long sun4m_imask[0x50] = {
	/* 0x00 - SMP */
	0,  SUN4M_SOFT_INT(1),
	SUN4M_SOFT_INT(2),  SUN4M_SOFT_INT(3),
	SUN4M_SOFT_INT(4),  SUN4M_SOFT_INT(5),
	SUN4M_SOFT_INT(6),  SUN4M_SOFT_INT(7),
	SUN4M_SOFT_INT(8),  SUN4M_SOFT_INT(9),
	SUN4M_SOFT_INT(10), SUN4M_SOFT_INT(11),
	SUN4M_SOFT_INT(12), SUN4M_SOFT_INT(13),
	SUN4M_SOFT_INT(14), SUN4M_SOFT_INT(15),
	/* 0x10 - soft */
	0,  SUN4M_SOFT_INT(1),
	SUN4M_SOFT_INT(2),  SUN4M_SOFT_INT(3),
	SUN4M_SOFT_INT(4),  SUN4M_SOFT_INT(5),
	SUN4M_SOFT_INT(6),  SUN4M_SOFT_INT(7),
	SUN4M_SOFT_INT(8),  SUN4M_SOFT_INT(9),
	SUN4M_SOFT_INT(10), SUN4M_SOFT_INT(11),
	SUN4M_SOFT_INT(12), SUN4M_SOFT_INT(13),
	SUN4M_SOFT_INT(14), SUN4M_SOFT_INT(15),
	/* 0x20 - onboard */
	0, 0, 0, 0,
	SUN4M_INT_SCSI,  0, SUN4M_INT_ETHERNET, 0,
	SUN4M_INT_VIDEO, SUN4M_INT_MODULE,
	SUN4M_INT_REALTIME, SUN4M_INT_FLOPPY,
	(SUN4M_INT_SERIAL | SUN4M_INT_KBDMS),
	SUN4M_INT_AUDIO, SUN4M_INT_E14, SUN4M_INT_MODULE_ERR,
	/* 0x30 - sbus */
	0, 0, SUN4M_INT_SBUS(0), SUN4M_INT_SBUS(1),
	0, SUN4M_INT_SBUS(2), 0, SUN4M_INT_SBUS(3),
	0, SUN4M_INT_SBUS(4), 0, SUN4M_INT_SBUS(5),
	0, SUN4M_INT_SBUS(6), 0, 0,
	/* 0x40 - vme */
	0, 0, SUN4M_INT_VME(0), SUN4M_INT_VME(1),
	0, SUN4M_INT_VME(2), 0, SUN4M_INT_VME(3),
	0, SUN4M_INT_VME(4), 0, SUN4M_INT_VME(5),
	0, SUN4M_INT_VME(6), 0, 0
};




static void sun4m_mask_irq(struct irq_data *data)
{
	struct sun4m_handler_data *handler_data;
	int cpu = smp_processor_id();

	handler_data = irq_data_get_irq_handler_data(data);
	if (handler_data->mask) {
		unsigned long flags;

		local_irq_save(flags);
		if (handler_data->percpu) {
			sbus_writel(handler_data->mask, &sun4m_irq_percpu[cpu]->set);
		} else {
			sbus_writel(handler_data->mask, &sun4m_irq_global->mask_set);
		}
		local_irq_restore(flags);
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Sam Ravnborg3741.57%116.67%


Linus Torvalds (pre-git)2932.58%116.67%


David S. Miller1314.61%116.67%


Jiang Liu77.87%116.67%


Keith M. Wesolowski22.25%116.67%


Adrian Bunk11.12%116.67%


Total89100.00%6100.00%






static void sun4m_unmask_irq(struct irq_data *data)
{
	struct sun4m_handler_data *handler_data;
	int cpu = smp_processor_id();

	handler_data = irq_data_get_irq_handler_data(data);
	if (handler_data->mask) {
		unsigned long flags;

		local_irq_save(flags);
		if (handler_data->percpu) {
			sbus_writel(handler_data->mask, &sun4m_irq_percpu[cpu]->clear);
		} else {
			sbus_writel(handler_data->mask, &sun4m_irq_global->mask_clear);
		}
		local_irq_restore(flags);
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3842.70%120.00%


Sam Ravnborg2528.09%120.00%


David S. Miller1719.10%120.00%


Jiang Liu77.87%120.00%


Keith M. Wesolowski22.25%120.00%


Total89100.00%5100.00%






static unsigned int sun4m_startup_irq(struct irq_data *data)
{
	irq_link(data->irq);
	sun4m_unmask_irq(data);
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Sam Ravnborg2074.07%150.00%


Linus Torvalds (pre-git)725.93%150.00%


Total27100.00%2100.00%






static void sun4m_shutdown_irq(struct irq_data *data)
{
	sun4m_mask_irq(data);
	irq_unlink(data->irq);
}


Contributors
PersonTokensPropCommitsCommitProp
Sam Ravnborg1982.61%150.00%


Robert Reif417.39%150.00%


Total23100.00%2100.00%




static struct irq_chip sun4m_irq = {
	.name		= "sun4m",
	.irq_startup	= sun4m_startup_irq,
	.irq_shutdown	= sun4m_shutdown_irq,
	.irq_mask	= sun4m_mask_irq,
	.irq_unmask	= sun4m_unmask_irq,
};





static unsigned int sun4m_build_device_irq(struct platform_device *op,
					   unsigned int real_irq)
{
	struct sun4m_handler_data *handler_data;
	unsigned int irq;
	unsigned int pil;

	if (real_irq >= OBP_INT_LEVEL_VME) {
		prom_printf("Bogus sun4m IRQ %u\n", real_irq);
		prom_halt();
	}
	pil = (real_irq & 0xf);
	irq = irq_alloc(real_irq, pil);

	if (irq == 0)
		goto out;

	handler_data = irq_get_handler_data(irq);
	if (unlikely(handler_data))
		goto out;

	handler_data = kzalloc(sizeof(struct sun4m_handler_data), GFP_ATOMIC);
	if (unlikely(!handler_data)) {
		prom_printf("IRQ: kzalloc(sun4m_handler_data) failed.\n");
		prom_halt();
	}

	handler_data->mask = sun4m_imask[real_irq];
	handler_data->percpu = real_irq < OBP_INT_LEVEL_ONBOARD;
	irq_set_chip_and_handler_name(irq, &sun4m_irq,
	                              handle_level_irq, "level");
	irq_set_handler_data(irq, handler_data);

out:
	return irq;
}


Contributors
PersonTokensPropCommitsCommitProp
Sam Ravnborg14187.04%133.33%


Linus Torvalds (pre-git)159.26%133.33%


David S. Miller63.70%133.33%


Total162100.00%3100.00%




struct sun4m_timer_percpu {
	
u32		l14_limit;
	
u32		l14_count;
	
u32		l14_limit_noclear;
	
u32		user_timer_start_stop;
};


static struct sun4m_timer_percpu __iomem *timers_percpu[SUN4M_NCPUS];


struct sun4m_timer_global {
	
u32		l10_limit;
	
u32		l10_count;
	
u32		l10_limit_noclear;
	
u32		reserved;
	
u32		timer_config;
};


static struct sun4m_timer_global __iomem *timers_global;




static void sun4m_clear_clock_irq(void)
{
	sbus_readl(&timers_global->l10_limit);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)1062.50%150.00%


David S. Miller637.50%150.00%


Total16100.00%2100.00%






void sun4m_nmi(struct pt_regs *regs)
{
	unsigned long afsr, afar, si;

	printk(KERN_ERR "Aieee: sun4m NMI received!\n");
	/* XXX HyperSparc hack XXX */
	__asm__ __volatile__("mov 0x500, %%g1\n\t"
                             "lda [%%g1] 0x4, %0\n\t"
                             "mov 0x600, %%g1\n\t"
                             "lda [%%g1] 0x4, %1\n\t" :
                             "=r" (afsr), "=r" (afar));
	printk(KERN_ERR "afsr=%08lx afar=%08lx\n", afsr, afar);
	si = sbus_readl(&sun4m_irq_global->pending);
	printk(KERN_ERR "si=%08lx\n", si);
	if (si & SUN4M_INT_MODULE_ERR)
		printk(KERN_ERR "Module async error\n");
	if (si & SUN4M_INT_M2S_WRITE_ERR)
		printk(KERN_ERR "MBus/SBus async error\n");
	if (si & SUN4M_INT_ECC_ERR)
		printk(KERN_ERR "ECC memory error\n");
	if (si & SUN4M_INT_VME_ERR)
		printk(KERN_ERR "VME async error\n");
	printk(KERN_ERR "you lose buddy boy...\n");
	show_regs(regs);
	prom_halt();
}


Contributors
PersonTokensPropCommitsCommitProp
Robert Reif118100.00%1100.00%


Total118100.00%1100.00%






void sun4m_unmask_profile_irq(void)
{
	unsigned long flags;

	local_irq_save(flags);
	sbus_writel(sun4m_imask[SUN4M_PROFILE_IRQ], &sun4m_irq_global->mask_clear);
	local_irq_restore(flags);
}


Contributors
PersonTokensPropCommitsCommitProp
Sam Ravnborg34100.00%1100.00%


Total34100.00%1100.00%






void sun4m_clear_profile_irq(int cpu)
{
	sbus_readl(&timers_percpu[cpu]->l14_limit);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)1263.16%266.67%


David S. Miller736.84%133.33%


Total19100.00%3100.00%






static void sun4m_load_profile_irq(int cpu, unsigned int limit)
{
	unsigned int value = limit ? timer_value(limit) : 0;
	sbus_writel(value, &timers_percpu[cpu]->l14_limit);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)1743.59%250.00%


Kirill V Tkhai1435.90%125.00%


David S. Miller820.51%125.00%


Total39100.00%4100.00%






static void __init sun4m_init_timers(void)
{
	struct device_node *dp = of_find_node_by_name(NULL, "counter");
	int i, err, len, num_cpu_timers;
	unsigned int irq;
	const u32 *addr;

	if (!dp) {
		printk(KERN_ERR "sun4m_init_timers: No 'counter' node.\n");
		return;
	}

	addr = of_get_property(dp, "address", &len);
	of_node_put(dp);
	if (!addr) {
		printk(KERN_ERR "sun4m_init_timers: No 'address' prop.\n");
		return;
	}

	num_cpu_timers = (len / sizeof(u32)) - 1;
	for (i = 0; i < num_cpu_timers; i++) {
		timers_percpu[i] = (void __iomem *)
			(unsigned long) addr[i];
	}
	timers_global = (void __iomem *)
		(unsigned long) addr[num_cpu_timers];

	/* Every per-cpu timer works in timer mode */
	sbus_writel(0x00000000, &timers_global->timer_config);

#ifdef CONFIG_SMP
	sparc_config.cs_period = SBUS_CLOCK_RATE * 2;  /* 2 seconds */
	sparc_config.features |= FEAT_L14_ONESHOT;
#else
	sparc_config.cs_period = SBUS_CLOCK_RATE / HZ; /* 1/HZ sec  */
	sparc_config.features |= FEAT_L10_CLOCKEVENT;
#endif
	sparc_config.features |= FEAT_L10_CLOCKSOURCE;
	sbus_writel(timer_value(sparc_config.cs_period),
	            &timers_global->l10_limit);

	master_l10_counter = &timers_global->l10_count;

	irq = sun4m_build_device_irq(NULL, SUN4M_TIMER_IRQ);

	err = request_irq(irq, timer_interrupt, IRQF_TIMER, "timer", NULL);
	if (err) {
		printk(KERN_ERR "sun4m_init_timers: Register IRQ error %d.\n",
			err);
		return;
	}

	for (i = 0; i < num_cpu_timers; i++)
		sbus_writel(0, &timers_percpu[i]->l14_limit);
	if (num_cpu_timers == 4)
		sbus_writel(SUN4M_INT_E14, &sun4m_irq_global->mask_set);

#ifdef CONFIG_SMP
	{
		unsigned long flags;
		struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];

		/* For SMP we use the level 14 ticker, however the bootup code
                 * has copied the firmware's level 14 vector into the boot cpu's
                 * trap table, we must fix this now or we get squashed.
                 */
		local_irq_save(flags);
		trap_table->inst_one = lvl14_save[0];
		trap_table->inst_two = lvl14_save[1];
		trap_table->inst_three = lvl14_save[2];
		trap_table->inst_four = lvl14_save[3];
		local_ops->cache_all();
		local_irq_restore(flags);
	}
#endif
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)18046.88%640.00%


David S. Miller11930.99%320.00%


Kirill V Tkhai6216.15%213.33%


Sam Ravnborg153.91%16.67%


Nicolas Palix51.30%16.67%


Ingo Molnar20.52%16.67%


Simon Arlott10.26%16.67%


Total384100.00%15100.00%






void __init sun4m_init_IRQ(void)
{
	struct device_node *dp = of_find_node_by_name(NULL, "interrupt");
	int len, i, mid, num_cpu_iregs;
	const u32 *addr;

	if (!dp) {
		printk(KERN_ERR "sun4m_init_IRQ: No 'interrupt' node.\n");
		return;
	}

	addr = of_get_property(dp, "address", &len);
	of_node_put(dp);
	if (!addr) {
		printk(KERN_ERR "sun4m_init_IRQ: No 'address' prop.\n");
		return;
	}

	num_cpu_iregs = (len / sizeof(u32)) - 1;
	for (i = 0; i < num_cpu_iregs; i++) {
		sun4m_irq_percpu[i] = (void __iomem *)
			(unsigned long) addr[i];
	}
	sun4m_irq_global = (void __iomem *)
		(unsigned long) addr[num_cpu_iregs];

	local_irq_disable();

	sbus_writel(~SUN4M_INT_MASKALL, &sun4m_irq_global->mask_set);
	for (i = 0; !cpu_find_by_instance(i, NULL, &mid); i++)
		sbus_writel(~0x17fff, &sun4m_irq_percpu[mid]->clear);

	if (num_cpu_iregs == 4)
		sbus_writel(0, &sun4m_irq_global->interrupt_target);

	sparc_config.init_timers      = sun4m_init_timers;
	sparc_config.build_device_irq = sun4m_build_device_irq;
	sparc_config.clock_rate       = SBUS_CLOCK_RATE;
	sparc_config.clear_clock_irq  = sun4m_clear_clock_irq;
	sparc_config.load_profile_irq = sun4m_load_profile_irq;


	/* Cannot enable interrupts until OBP ticker is disabled. */
}

Contributors
PersonTokensPropCommitsCommitProp
David S. Miller10343.46%18.33%


Linus Torvalds (pre-git)8937.55%433.33%


Sam Ravnborg218.86%433.33%


Keith M. Wesolowski135.49%18.33%


Kirill V Tkhai62.53%18.33%


Nicolas Palix52.11%18.33%


Total237100.00%12100.00%




Overall Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)52128.42%927.27%


Sam Ravnborg37420.40%618.18%


Robert Reif35919.59%13.03%


David S. Miller34618.88%39.09%


Al Viro975.29%13.03%


Kirill V Tkhai824.47%26.06%


Keith M. Wesolowski170.93%26.06%


Jiang Liu140.76%13.03%


Nicolas Palix100.55%13.03%


Ingo Molnar50.27%26.06%


Stephen Rothwell30.16%13.03%


Pete Zaitcev20.11%13.03%


Simon Arlott10.05%13.03%


Adrian Bunk10.05%13.03%


Greg Kroah-Hartman10.05%13.03%


Total1833100.00%33100.00%


Directory: arch/sparc/kernel



Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.