[mirror_ubuntu-artful-kernel.git] / arch / alpha / kernel / irq_alpha.c

/*
 * Alpha specific irq code.
 */

#include <linux/init.h>
#include <linux/sched.h>
#include <linux/irq.h>
#include <linux/kernel_stat.h>
#include <linux/module.h>

#include <asm/machvec.h>
#include <asm/dma.h>
#include <asm/perf_event.h>
#include <asm/mce.h>

#include "proto.h"
#include "irq_impl.h"

/* Hack minimum IPL during interrupt processing for broken hardware.  */
#ifdef CONFIG_ALPHA_BROKEN_IRQ_MASK
int __min_ipl;
EXPORT_SYMBOL(__min_ipl);
#endif

/*
 * Performance counter hook.  A module can override this to
 * do something useful.
 */
static void
dummy_perf(unsigned long vector, struct pt_regs *regs)
{
	irq_err_count++;
	printk(KERN_CRIT "Performance counter interrupt!\n");
}

void (*perf_irq)(unsigned long, struct pt_regs *) = dummy_perf;
EXPORT_SYMBOL(perf_irq);

/*
 * The main interrupt entry point.
 */

asmlinkage void 
do_entInt(unsigned long type, unsigned long vector,
	  unsigned long la_ptr, struct pt_regs *regs)
{
	struct pt_regs *old_regs;

	/*
	 * Disable interrupts during IRQ handling.
	 * Note that there is no matching local_irq_enable() due to
	 * severe problems with RTI at IPL0 and some MILO PALcode
	 * (namely LX164).
	 */
	local_irq_disable();
	switch (type) {
	case 0:
#ifdef CONFIG_SMP
		handle_ipi(regs);
		return;
#else
		irq_err_count++;
		printk(KERN_CRIT "Interprocessor interrupt? "
		       "You must be kidding!\n");
#endif
		break;
	case 1:
		old_regs = set_irq_regs(regs);
		handle_irq(RTC_IRQ);
		set_irq_regs(old_regs);
		return;
	case 2:
		old_regs = set_irq_regs(regs);
		alpha_mv.machine_check(vector, la_ptr);
		set_irq_regs(old_regs);
		return;
	case 3:
		old_regs = set_irq_regs(regs);
		alpha_mv.device_interrupt(vector);
		set_irq_regs(old_regs);
		return;
	case 4:
		perf_irq(la_ptr, regs);
		return;
	default:
		printk(KERN_CRIT "Hardware intr %ld %lx? Huh?\n",
		       type, vector);
	}
	printk(KERN_CRIT "PC = %016lx PS=%04lx\n", regs->pc, regs->ps);
}

void __init
common_init_isa_dma(void)
{
	outb(0, DMA1_RESET_REG);
	outb(0, DMA2_RESET_REG);
	outb(0, DMA1_CLR_MASK_REG);
	outb(0, DMA2_CLR_MASK_REG);
}

void __init
init_IRQ(void)
{
	/* Just in case the platform init_irq() causes interrupts/mchecks
	   (as is the case with RAWHIDE, at least).  */
	wrent(entInt, 0);

	alpha_mv.init_irq();
}

/*
 * machine error checks
 */
#define MCHK_K_TPERR           0x0080
#define MCHK_K_TCPERR          0x0082
#define MCHK_K_HERR            0x0084
#define MCHK_K_ECC_C           0x0086
#define MCHK_K_ECC_NC          0x0088
#define MCHK_K_OS_BUGCHECK     0x008A
#define MCHK_K_PAL_BUGCHECK    0x0090

#ifndef CONFIG_SMP
struct mcheck_info __mcheck_info;
#endif

void
process_mcheck_info(unsigned long vector, unsigned long la_ptr,
		    const char *machine, int expected)
{
	struct el_common *mchk_header;
	const char *reason;

	/*
	 * See if the machine check is due to a badaddr() and if so,
	 * ignore it.
	 */

#ifdef CONFIG_VERBOSE_MCHECK
	if (alpha_verbose_mcheck > 1) {
		printk(KERN_CRIT "%s machine check %s\n", machine,
		       expected ? "expected." : "NOT expected!!!");
	}
#endif

	if (expected) {
		int cpu = smp_processor_id();
		mcheck_expected(cpu) = 0;
		mcheck_taken(cpu) = 1;
		return;
	}

	mchk_header = (struct el_common *)la_ptr;

	printk(KERN_CRIT "%s machine check: vector=0x%lx pc=0x%lx code=0x%x\n",
	       machine, vector, get_irq_regs()->pc, mchk_header->code);

	switch (mchk_header->code) {
	/* Machine check reasons.  Defined according to PALcode sources.  */
	case 0x80: reason = "tag parity error"; break;
	case 0x82: reason = "tag control parity error"; break;
	case 0x84: reason = "generic hard error"; break;
	case 0x86: reason = "correctable ECC error"; break;
	case 0x88: reason = "uncorrectable ECC error"; break;
	case 0x8A: reason = "OS-specific PAL bugcheck"; break;
	case 0x90: reason = "callsys in kernel mode"; break;
	case 0x96: reason = "i-cache read retryable error"; break;
	case 0x98: reason = "processor detected hard error"; break;
	
	/* System specific (these are for Alcor, at least): */
	case 0x202: reason = "system detected hard error"; break;
	case 0x203: reason = "system detected uncorrectable ECC error"; break;
	case 0x204: reason = "SIO SERR occurred on PCI bus"; break;
	case 0x205: reason = "parity error detected by core logic"; break;
	case 0x206: reason = "SIO IOCHK occurred on ISA bus"; break;
	case 0x207: reason = "non-existent memory error"; break;
	case 0x208: reason = "MCHK_K_DCSR"; break;
	case 0x209: reason = "PCI SERR detected"; break;
	case 0x20b: reason = "PCI data parity error detected"; break;
	case 0x20d: reason = "PCI address parity error detected"; break;
	case 0x20f: reason = "PCI master abort error"; break;
	case 0x211: reason = "PCI target abort error"; break;
	case 0x213: reason = "scatter/gather PTE invalid error"; break;
	case 0x215: reason = "flash ROM write error"; break;
	case 0x217: reason = "IOA timeout detected"; break;
	case 0x219: reason = "IOCHK#, EISA add-in board parity or other catastrophic error"; break;
	case 0x21b: reason = "EISA fail-safe timer timeout"; break;
	case 0x21d: reason = "EISA bus time-out"; break;
	case 0x21f: reason = "EISA software generated NMI"; break;
	case 0x221: reason = "unexpected ev5 IRQ[3] interrupt"; break;
	default: reason = "unknown"; break;
	}

	printk(KERN_CRIT "machine check type: %s%s\n",
	       reason, mchk_header->retry ? " (retryable)" : "");

	dik_show_regs(get_irq_regs(), NULL);

#ifdef CONFIG_VERBOSE_MCHECK
	if (alpha_verbose_mcheck > 1) {
		/* Dump the logout area to give all info.  */
		unsigned long *ptr = (unsigned long *)la_ptr;
		long i;
		for (i = 0; i < mchk_header->size / sizeof(long); i += 2) {
			printk(KERN_CRIT "   +%8lx %016lx %016lx\n",
			       i*sizeof(long), ptr[i], ptr[i+1]);
		}
	}
#endif /* CONFIG_VERBOSE_MCHECK */
}

/*
 * The special RTC interrupt type.  The interrupt itself was
 * processed by PALcode, and comes in via entInt vector 1.
 */

struct irqaction timer_irqaction = {
	.handler	= rtc_timer_interrupt,
	.name		= "timer",
};

void __init
init_rtc_irq(void)
{
	irq_set_chip_and_handler_name(RTC_IRQ, &dummy_irq_chip,
				      handle_percpu_irq, "RTC");
	setup_irq(RTC_IRQ, &timer_irqaction);
}

/* Dummy irqactions.  */
struct irqaction isa_cascade_irqaction = {
	.handler	= no_action,
	.name		= "isa-cascade"
};

struct irqaction timer_cascade_irqaction = {
	.handler	= no_action,
	.name		= "timer-cascade"
};

struct irqaction halt_switch_irqaction = {
	.handler	= no_action,
	.name		= "halt-switch"
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Alpha specific irq code.
	3	*/
	4
1da177e4 LT	5	#include <linux/init.h>
	6	#include <linux/sched.h>
	7	#include <linux/irq.h>
	8	#include <linux/kernel_stat.h>
cff52daf	9	#include <linux/module.h>
1da177e4 LT	10
	11	#include <asm/machvec.h>
	12	#include <asm/dma.h>
979f8671	13	#include <asm/perf_event.h>
ec221208	14	#include <asm/mce.h>
1da177e4 LT	15
	16	#include "proto.h"
	17	#include "irq_impl.h"
	18
	19	/* Hack minimum IPL during interrupt processing for broken hardware. */
	20	#ifdef CONFIG_ALPHA_BROKEN_IRQ_MASK
	21	int __min_ipl;
cff52daf	22	EXPORT_SYMBOL(__min_ipl);
1da177e4 LT	23	#endif
	24
	25	/*
	26	* Performance counter hook. A module can override this to
	27	* do something useful.
	28	*/
	29	static void
	30	dummy_perf(unsigned long vector, struct pt_regs *regs)
	31	{
	32	irq_err_count++;
	33	printk(KERN_CRIT "Performance counter interrupt!\n");
	34	}
	35
	36	void (perf_irq)(unsigned long, struct pt_regs ) = dummy_perf;
cff52daf	37	EXPORT_SYMBOL(perf_irq);
1da177e4 LT	38
	39	/*
	40	* The main interrupt entry point.
	41	*/
	42
	43	asmlinkage void
	44	do_entInt(unsigned long type, unsigned long vector,
	45	unsigned long la_ptr, struct pt_regs *regs)
	46	{
7ca56053	47	struct pt_regs *old_regs;
e20800fd WD	48
	49	/*
	50	* Disable interrupts during IRQ handling.
	51	* Note that there is no matching local_irq_enable() due to
	52	* severe problems with RTI at IPL0 and some MILO PALcode
	53	* (namely LX164).
	54	*/
	55	local_irq_disable();
1da177e4 LT	56	switch (type) {
	57	case 0:
	58	#ifdef CONFIG_SMP
	59	handle_ipi(regs);
	60	return;
	61	#else
	62	irq_err_count++;
	63	printk(KERN_CRIT "Interprocessor interrupt? "
	64	"You must be kidding!\n");
	65	#endif
	66	break;
	67	case 1:
3dbb8c62	68	old_regs = set_irq_regs(regs);
3dbb8c62	69	handle_irq(RTC_IRQ);
3dbb8c62	70	set_irq_regs(old_regs);
1da177e4 LT	71	return;
1da177e4 LT	72	case 2:
4fa1970a AV	73	old_regs = set_irq_regs(regs);
	74	alpha_mv.machine_check(vector, la_ptr);
	75	set_irq_regs(old_regs);
1da177e4 LT	76	return;
1da177e4 LT	77	case 3:
7ca56053 AV	78	old_regs = set_irq_regs(regs);
	79	alpha_mv.device_interrupt(vector);
	80	set_irq_regs(old_regs);
1da177e4 LT	81	return;
	82	case 4:
	83	perf_irq(la_ptr, regs);
	84	return;
	85	default:
	86	printk(KERN_CRIT "Hardware intr %ld %lx? Huh?\n",
	87	type, vector);
	88	}
	89	printk(KERN_CRIT "PC = %016lx PS=%04lx\n", regs->pc, regs->ps);
	90	}
	91
	92	void __init
	93	common_init_isa_dma(void)
	94	{
	95	outb(0, DMA1_RESET_REG);
	96	outb(0, DMA2_RESET_REG);
	97	outb(0, DMA1_CLR_MASK_REG);
	98	outb(0, DMA2_CLR_MASK_REG);
	99	}
	100
	101	void __init
	102	init_IRQ(void)
	103	{
	104	/* Just in case the platform init_irq() causes interrupts/mchecks
	105	(as is the case with RAWHIDE, at least). */
	106	wrent(entInt, 0);
	107
	108	alpha_mv.init_irq();
	109	}
	110
	111	/*
	112	* machine error checks
	113	*/
	114	#define MCHK_K_TPERR 0x0080
	115	#define MCHK_K_TCPERR 0x0082
	116	#define MCHK_K_HERR 0x0084
	117	#define MCHK_K_ECC_C 0x0086
	118	#define MCHK_K_ECC_NC 0x0088
	119	#define MCHK_K_OS_BUGCHECK 0x008A
	120	#define MCHK_K_PAL_BUGCHECK 0x0090
	121
	122	#ifndef CONFIG_SMP
	123	struct mcheck_info __mcheck_info;
	124	#endif
	125
	126	void
	127	process_mcheck_info(unsigned long vector, unsigned long la_ptr,
4fa1970a	128	const char *machine, int expected)
1da177e4 LT	129	{
	130	struct el_common *mchk_header;
	131	const char *reason;
	132
	133	/*
	134	* See if the machine check is due to a badaddr() and if so,
	135	* ignore it.
	136	*/
	137
	138	#ifdef CONFIG_VERBOSE_MCHECK
	139	if (alpha_verbose_mcheck > 1) {
	140	printk(KERN_CRIT "%s machine check %s\n", machine,
	141	expected ? "expected." : "NOT expected!!!");
	142	}
	143	#endif
	144
	145	if (expected) {
	146	int cpu = smp_processor_id();
	147	mcheck_expected(cpu) = 0;
	148	mcheck_taken(cpu) = 1;
	149	return;
	150	}
	151
	152	mchk_header = (struct el_common *)la_ptr;
	153
	154	printk(KERN_CRIT "%s machine check: vector=0x%lx pc=0x%lx code=0x%x\n",
4fa1970a	155	machine, vector, get_irq_regs()->pc, mchk_header->code);
1da177e4 LT	156
	157	switch (mchk_header->code) {
	158	/* Machine check reasons. Defined according to PALcode sources. */
	159	case 0x80: reason = "tag parity error"; break;
	160	case 0x82: reason = "tag control parity error"; break;
	161	case 0x84: reason = "generic hard error"; break;
	162	case 0x86: reason = "correctable ECC error"; break;
	163	case 0x88: reason = "uncorrectable ECC error"; break;
	164	case 0x8A: reason = "OS-specific PAL bugcheck"; break;
	165	case 0x90: reason = "callsys in kernel mode"; break;
	166	case 0x96: reason = "i-cache read retryable error"; break;
	167	case 0x98: reason = "processor detected hard error"; break;
	168
	169	/* System specific (these are for Alcor, at least): */
	170	case 0x202: reason = "system detected hard error"; break;
	171	case 0x203: reason = "system detected uncorrectable ECC error"; break;
	172	case 0x204: reason = "SIO SERR occurred on PCI bus"; break;
	173	case 0x205: reason = "parity error detected by core logic"; break;
	174	case 0x206: reason = "SIO IOCHK occurred on ISA bus"; break;
	175	case 0x207: reason = "non-existent memory error"; break;
	176	case 0x208: reason = "MCHK_K_DCSR"; break;
	177	case 0x209: reason = "PCI SERR detected"; break;
	178	case 0x20b: reason = "PCI data parity error detected"; break;
	179	case 0x20d: reason = "PCI address parity error detected"; break;
	180	case 0x20f: reason = "PCI master abort error"; break;
	181	case 0x211: reason = "PCI target abort error"; break;
	182	case 0x213: reason = "scatter/gather PTE invalid error"; break;
	183	case 0x215: reason = "flash ROM write error"; break;
	184	case 0x217: reason = "IOA timeout detected"; break;
	185	case 0x219: reason = "IOCHK#, EISA add-in board parity or other catastrophic error"; break;
	186	case 0x21b: reason = "EISA fail-safe timer timeout"; break;
	187	case 0x21d: reason = "EISA bus time-out"; break;
	188	case 0x21f: reason = "EISA software generated NMI"; break;
	189	case 0x221: reason = "unexpected ev5 IRQ[3] interrupt"; break;
	190	default: reason = "unknown"; break;
	191	}
	192
	193	printk(KERN_CRIT "machine check type: %s%s\n",
	194	reason, mchk_header->retry ? " (retryable)" : "");
	195
4fa1970a	196	dik_show_regs(get_irq_regs(), NULL);
1da177e4 LT	197
	198	#ifdef CONFIG_VERBOSE_MCHECK
	199	if (alpha_verbose_mcheck > 1) {
	200	/* Dump the logout area to give all info. */
	201	unsigned long ptr = (unsigned long )la_ptr;
	202	long i;
	203	for (i = 0; i < mchk_header->size / sizeof(long); i += 2) {
	204	printk(KERN_CRIT " +%8lx %016lx %016lx\n",
	205	i*sizeof(long), ptr[i], ptr[i+1]);
	206	}
	207	}
	208	#endif /* CONFIG_VERBOSE_MCHECK */
	209	}
	210
	211	/*
	212	* The special RTC interrupt type. The interrupt itself was
	213	* processed by PALcode, and comes in via entInt vector 1.
	214	*/
	215
1da177e4	216	struct irqaction timer_irqaction = {
4914d7b4	217	.handler = rtc_timer_interrupt,
1da177e4 LT	218	.name = "timer",
	219	};
	220
1da177e4 LT	221	void __init
	222	init_rtc_irq(void)
	223	{
61813188	224	irq_set_chip_and_handler_name(RTC_IRQ, &dummy_irq_chip,
dff64649	225	handle_percpu_irq, "RTC");
eb1e17fb	226	setup_irq(RTC_IRQ, &timer_irqaction);
1da177e4 LT	227	}
	228
	229	/* Dummy irqactions. */
	230	struct irqaction isa_cascade_irqaction = {
	231	.handler = no_action,
	232	.name = "isa-cascade"
	233	};
	234
	235	struct irqaction timer_cascade_irqaction = {
	236	.handler = no_action,
	237	.name = "timer-cascade"
	238	};
	239
	240	struct irqaction halt_switch_irqaction = {
	241	.handler = no_action,
	242	.name = "halt-switch"
	243	};