/* * SuperH interrupt controller module * * Copyright (c) 2007 Magnus Damm * Based on sh_timer.c and arm_timer.c by Paul Brook * Copyright (c) 2005-2006 CodeSourcery. * * This code is licenced under the GPL. */#include <assert.h>#include "sh_intc.h"#include "hw.h"#include "sh.h"//#define DEBUG_INTC//#define DEBUG_INTC_SOURCES#define INTC_A7(x) ((x) & 0x1fffffff)#define INTC_ARRAY(x) (sizeof(x) / sizeof(x[0]))void sh_intc_toggle_source(struct intc_source *source,			   int enable_adj, int assert_adj){    int enable_changed = 0;    int pending_changed = 0;    int old_pending;    if ((source->enable_count == source->enable_max) && (enable_adj == -1))        enable_changed = -1;    source->enable_count += enable_adj;    if (source->enable_count == source->enable_max)        enable_changed = 1;    source->asserted += assert_adj;    old_pending = source->pending;    source->pending = source->asserted &&      (source->enable_count == source->enable_max);    if (old_pending != source->pending)        pending_changed = 1;    if (pending_changed) {        if (source->pending) {            source->parent->pending++;	    if (source->parent->pending == 1)                cpu_interrupt(first_cpu, CPU_INTERRUPT_HARD);	}	else {            source->parent->pending--;	    if (source->parent->pending == 0)                cpu_reset_interrupt(first_cpu, CPU_INTERRUPT_HARD);	}    }  if (enable_changed || assert_adj || pending_changed) {#ifdef DEBUG_INTC_SOURCES            printf("sh_intc: (%d/%d/%d/%d) interrupt source 0x%x %s%s%s\n",		   source->parent->pending,		   source->asserted,		   source->enable_count,		   source->enable_max,		   source->vect,		   source->asserted ? "asserted " :		   assert_adj ? "deasserted" : "",		   enable_changed == 1 ? "enabled " :		   enable_changed == -1 ? "disabled " : "",		   source->pending ? "pending" : "");#endif  }}int sh_intc_get_pending_vector(struct intc_desc *desc, int imask){    unsigned int i;    /* slow: use a linked lists of pending sources instead */    /* wrong: take interrupt priority into account (one list per priority) */    if (imask == 0x0f) {        return -1; /* FIXME, update code to include priority per source */    }    for (i = 0; i < desc->nr_sources; i++) {        struct intc_source *source = desc->sources + i;	if (source->pending) {#ifdef DEBUG_INTC_SOURCES            printf("sh_intc: (%d) returning interrupt source 0x%x\n",		   desc->pending, source->vect);#endif            return source->vect;	}    }    assert(0);}#define INTC_MODE_NONE       0#define INTC_MODE_DUAL_SET   1#define INTC_MODE_DUAL_CLR   2#define INTC_MODE_ENABLE_REG 3#define INTC_MODE_MASK_REG   4#define INTC_MODE_IS_PRIO    8static unsigned int sh_intc_mode(unsigned long address,				 unsigned long set_reg, unsigned long clr_reg){    if ((address != INTC_A7(set_reg)) &&	(address != INTC_A7(clr_reg)))        return INTC_MODE_NONE;    if (set_reg && clr_reg) {        if (address == INTC_A7(set_reg))            return INTC_MODE_DUAL_SET;	else            return INTC_MODE_DUAL_CLR;    }    if (set_reg)        return INTC_MODE_ENABLE_REG;    else        return INTC_MODE_MASK_REG;}static void sh_intc_locate(struct intc_desc *desc,			   unsigned long address,			   unsigned long **datap,			   intc_enum **enums,			   unsigned int *first,			   unsigned int *width,			   unsigned int *modep){    unsigned int i, mode;    /* this is slow but works for now */    if (desc->mask_regs) {        for (i = 0; i < desc->nr_mask_regs; i++) {	    struct intc_mask_reg *mr = desc->mask_regs + i;	    mode = sh_intc_mode(address, mr->set_reg, mr->clr_reg);	    if (mode == INTC_MODE_NONE)                continue;	    *modep = mode;	    *datap = &mr->value;	    *enums = mr->enum_ids;	    *first = mr->reg_width - 1;	    *width = 1;	    return;	}    }    if (desc->prio_regs) {        for (i = 0; i < desc->nr_prio_regs; i++) {	    struct intc_prio_reg *pr = desc->prio_regs + i;	    mode = sh_intc_mode(address, pr->set_reg, pr->clr_reg);	    if (mode == INTC_MODE_NONE)                continue;	    *modep = mode | INTC_MODE_IS_PRIO;	    *datap = &pr->value;	    *enums = pr->enum_ids;	    *first = (pr->reg_width / pr->field_width) - 1;	    *width = pr->field_width;	    return;	}    }    assert(0);}static void sh_intc_toggle_mask(struct intc_desc *desc, intc_enum id,				int enable, int is_group){    struct intc_source *source = desc->sources + id;    if (!id)	return;    if (!source->next_enum_id && (!source->enable_max || !source->vect)) {#ifdef DEBUG_INTC_SOURCES        printf("sh_intc: reserved interrupt source %d modified\n", id);#endif	return;    }    if (source->vect)        sh_intc_toggle_source(source, enable ? 1 : -1, 0);#ifdef DEBUG_INTC    else {        printf("setting interrupt group %d to %d\n", id, !!enable);    }#endif    if ((is_group || !source->vect) && source->next_enum_id) {        sh_intc_toggle_mask(desc, source->next_enum_id, enable, 1);    }#ifdef DEBUG_INTC    if (!source->vect) {        printf("setting interrupt group %d to %d - done\n", id, !!enable);    }#endif}static uint32_t sh_intc_read(void *opaque, target_phys_addr_t offset){    struct intc_desc *desc = opaque;    intc_enum *enum_ids = NULL;    unsigned int first = 0;    unsigned int width = 0;    unsigned int mode = 0;    unsigned long *valuep;#ifdef DEBUG_INTC    printf("sh_intc_read 0x%lx\n", (unsigned long) offset);#endif    sh_intc_locate(desc, (unsigned long)offset, &valuep, 		   &enum_ids, &first, &width, &mode);    return *valuep;}static void sh_intc_write(void *opaque, target_phys_addr_t offset,			  uint32_t value){    struct intc_desc *desc = opaque;    intc_enum *enum_ids = NULL;    unsigned int first = 0;    unsigned int width = 0;    unsigned int mode = 0;    unsigned int k;    unsigned long *valuep;    unsigned long mask;#ifdef DEBUG_INTC    printf("sh_intc_write 0x%lx 0x%08x\n", (unsigned long) offset, value);#endif    sh_intc_locate(desc, (unsigned long)offset, &valuep, 		   &enum_ids, &first, &width, &mode);    switch (mode) {    case INTC_MODE_ENABLE_REG | INTC_MODE_IS_PRIO: break;    case INTC_MODE_DUAL_SET: value |= *valuep; break;    case INTC_MODE_DUAL_CLR: value = *valuep & ~value; break;    default: assert(0);    }    for (k = 0; k <= first; k++) {        mask = ((1 << width) - 1) << ((first - k) * width);	if ((*valuep & mask) == (value & mask))            continue;#if 0	printf("k = %d, first = %d, enum = %d, mask = 0x%08x\n", 	       k, first, enum_ids[k], (unsigned int)mask);#endif        sh_intc_toggle_mask(desc, enum_ids[k], value & mask, 0);    }    *valuep = value;#ifdef DEBUG_INTC    printf("sh_intc_write 0x%lx -> 0x%08x\n", (unsigned long) offset, value);#endif}static CPUReadMemoryFunc *sh_intc_readfn[] = {    sh_intc_read,    sh_intc_read,    sh_intc_read};static CPUWriteMemoryFunc *sh_intc_writefn[] = {    sh_intc_write,    sh_intc_write,    sh_intc_write};struct intc_source *sh_intc_source(struct intc_desc *desc, intc_enum id){    if (id)        return desc->sources + id;    return NULL;}static void sh_intc_register(struct intc_desc *desc, 			     unsigned long address){    if (address)        cpu_register_physical_memory(INTC_A7(address), 4, desc->iomemtype);}static void sh_intc_register_source(struct intc_desc *desc,				    intc_enum source,				    struct intc_group *groups,				    int nr_groups){    unsigned int i, k;    struct intc_source *s;    if (desc->mask_regs) {        for (i = 0; i < desc->nr_mask_regs; i++) {	    struct intc_mask_reg *mr = desc->mask_regs + i;	    for (k = 0; k < INTC_ARRAY(mr->enum_ids); k++) {                if (mr->enum_ids[k] != source)                    continue;		s = sh_intc_source(desc, mr->enum_ids[k]);		if (s)                    s->enable_max++;	    }	}    }    if (desc->prio_regs) {        for (i = 0; i < desc->nr_prio_regs; i++) {	    struct intc_prio_reg *pr = desc->prio_regs + i;	    for (k = 0; k < INTC_ARRAY(pr->enum_ids); k++) {                if (pr->enum_ids[k] != source)                    continue;		s = sh_intc_source(desc, pr->enum_ids[k]);		if (s)                    s->enable_max++;	    }	}    }    if (groups) {        for (i = 0; i < nr_groups; i++) {	    struct intc_group *gr = groups + i;	    for (k = 0; k < INTC_ARRAY(gr->enum_ids); k++) {                if (gr->enum_ids[k] != source)                    continue;		s = sh_intc_source(desc, gr->enum_ids[k]);		if (s)                    s->enable_max++;	    }	}    }}void sh_intc_register_sources(struct intc_desc *desc,			      struct intc_vect *vectors,			      int nr_vectors,			      struct intc_group *groups,			      int nr_groups){    unsigned int i, k;    struct intc_source *s;    for (i = 0; i < nr_vectors; i++) {	struct intc_vect *vect = vectors + i;	sh_intc_register_source(desc, vect->enum_id, groups, nr_groups);	s = sh_intc_source(desc, vect->enum_id);	if (s)	    s->vect = vect->vect;#ifdef DEBUG_INTC_SOURCES	printf("sh_intc: registered source %d -> 0x%04x (%d/%d)\n",	       vect->enum_id, s->vect, s->enable_count, s->enable_max);#endif    }    if (groups) {        for (i = 0; i < nr_groups; i++) {	    struct intc_group *gr = groups + i;	    s = sh_intc_source(desc, gr->enum_id);	    s->next_enum_id = gr->enum_ids[0];	    for (k = 1; k < INTC_ARRAY(gr->enum_ids); k++) {                if (!gr->enum_ids[k])                    continue;		s = sh_intc_source(desc, gr->enum_ids[k - 1]);		s->next_enum_id = gr->enum_ids[k];	    }#ifdef DEBUG_INTC_SOURCES	    printf("sh_intc: registered group %d (%d/%d)\n",		   gr->enum_id, s->enable_count, s->enable_max);#endif	}    }}int sh_intc_init(struct intc_desc *desc,		 int nr_sources,		 struct intc_mask_reg *mask_regs,		 int nr_mask_regs,		 struct intc_prio_reg *prio_regs,		 int nr_prio_regs){    unsigned int i;    desc->pending = 0;    desc->nr_sources = nr_sources;    desc->mask_regs = mask_regs;    desc->nr_mask_regs = nr_mask_regs;    desc->prio_regs = prio_regs;    desc->nr_prio_regs = nr_prio_regs;    i = sizeof(struct intc_source) * nr_sources;    desc->sources = malloc(i);    if (!desc->sources)        return -1;    memset(desc->sources, 0, i);    for (i = 0; i < desc->nr_sources; i++) {        struct intc_source *source = desc->sources + i;        source->parent = desc;    }     desc->iomemtype = cpu_register_io_memory(0, sh_intc_readfn,					     sh_intc_writefn, desc);    if (desc->mask_regs) {        for (i = 0; i < desc->nr_mask_regs; i++) {	    struct intc_mask_reg *mr = desc->mask_regs + i;	    sh_intc_register(desc, mr->set_reg);	    sh_intc_register(desc, mr->clr_reg);	}    }    if (desc->prio_regs) {        for (i = 0; i < desc->nr_prio_regs; i++) {	    struct intc_prio_reg *pr = desc->prio_regs + i;	    sh_intc_register(desc, pr->set_reg);	    sh_intc_register(desc, pr->clr_reg);	}    }    return 0;}