hw/omap1.c : separate interrupt controller module

Signed-off-by: cmchao <cmchao@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

4 files changed, 603 insertions, 575 deletions

diff --git a/Makefile.target b/Makefile.target
index 8d812e191..c909680ad 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -268,7 +268,7 @@ obj-arm-y += pxa2xx.o pxa2xx_pic.o pxa2xx_gpio.o pxa2xx_timer.o pxa2xx_dma.o
 obj-arm-y += pxa2xx_lcd.o pxa2xx_mmci.o pxa2xx_pcmcia.o pxa2xx_keypad.o
 obj-arm-y += gumstix.o
 obj-arm-y += zaurus.o ide/microdrive.o spitz.o tosa.o tc6393xb.o
-obj-arm-y += omap1.o omap_lcdc.o omap_dma.o omap_clk.o omap_mmc.o omap_i2c.o omap_gpio.o
+obj-arm-y += omap1.o omap_lcdc.o omap_dma.o omap_clk.o omap_mmc.o omap_i2c.o omap_gpio.o omap_intc.o
 obj-arm-y += omap2.o omap_dss.o soc_dma.o omap_gptimer.o omap_synctimer.o omap_gpmc.o omap_sdrc.o
 obj-arm-y += omap_sx1.o palm.o tsc210x.o
 obj-arm-y += nseries.o blizzard.o onenand.o vga.o cbus.o tusb6010.o usb-musb.o
diff --git a/hw/omap.h b/hw/omap.h
index ad4a46588..ea23ec97b 100644
--- a/hw/omap.h
+++ b/hw/omap.h
@@ -71,6 +71,7 @@ target_phys_addr_t omap_l4_attach(struct omap_target_agent_s *ta, int region,
                 int iotype);
 # define l4_register_io_memory	cpu_register_io_memory
 
+/* OMAP interrupt controller */
 struct omap_intr_handler_s;
 struct omap_intr_handler_s *omap_inth_init(target_phys_addr_t base,
                 unsigned long size, unsigned char nbanks, qemu_irq **pins,
@@ -80,6 +81,7 @@ struct omap_intr_handler_s *omap2_inth_init(target_phys_addr_t base,
                 qemu_irq parent_irq, qemu_irq parent_fiq,
                 omap_clk fclk, omap_clk iclk);
 void omap_inth_reset(struct omap_intr_handler_s *s);
+qemu_irq omap_inth_get_pin(struct omap_intr_handler_s *s, int n);
 
 struct omap_prcm_s;
 struct omap_prcm_s *omap_prcm_init(struct omap_target_agent_s *ta,
diff --git a/hw/omap1.c b/hw/omap1.c
index 8b78c0563..21c53fed0 100644
--- a/hw/omap1.c
+++ b/hw/omap1.c
@@ -79,578 +79,6 @@ void omap_badwidth_write32(void *opaque, target_phys_addr_t addr,
     cpu_physical_memory_write(addr, (void *) &value, 4);
 }
 
-/* Interrupt Handlers */
-struct omap_intr_handler_bank_s {
-    uint32_t irqs;
-    uint32_t inputs;
-    uint32_t mask;
-    uint32_t fiq;
-    uint32_t sens_edge;
-    uint32_t swi;
-    unsigned char priority[32];
-};
-
-struct omap_intr_handler_s {
-    qemu_irq *pins;
-    qemu_irq parent_intr[2];
-    unsigned char nbanks;
-    int level_only;
-
-    /* state */
-    uint32_t new_agr[2];
-    int sir_intr[2];
-    int autoidle;
-    uint32_t mask;
-    struct omap_intr_handler_bank_s bank[];
-};
-
-static void omap_inth_sir_update(struct omap_intr_handler_s *s, int is_fiq)
-{
-    int i, j, sir_intr, p_intr, p, f;
-    uint32_t level;
-    sir_intr = 0;
-    p_intr = 255;
-
-    /* Find the interrupt line with the highest dynamic priority.
-     * Note: 0 denotes the hightest priority.
-     * If all interrupts have the same priority, the default order is IRQ_N,
-     * IRQ_N-1,...,IRQ_0. */
-    for (j = 0; j < s->nbanks; ++j) {
-        level = s->bank[j].irqs & ~s->bank[j].mask &
-                (is_fiq ? s->bank[j].fiq : ~s->bank[j].fiq);
-        for (f = ffs(level), i = f - 1, level >>= f - 1; f; i += f,
-                        level >>= f) {
-            p = s->bank[j].priority[i];
-            if (p <= p_intr) {
-                p_intr = p;
-                sir_intr = 32 * j + i;
-            }
-            f = ffs(level >> 1);
-        }
-    }
-    s->sir_intr[is_fiq] = sir_intr;
-}
-
-static inline void omap_inth_update(struct omap_intr_handler_s *s, int is_fiq)
-{
-    int i;
-    uint32_t has_intr = 0;
-
-    for (i = 0; i < s->nbanks; ++i)
-        has_intr |= s->bank[i].irqs & ~s->bank[i].mask &
-                (is_fiq ? s->bank[i].fiq : ~s->bank[i].fiq);
-
-    if (s->new_agr[is_fiq] & has_intr & s->mask) {
-        s->new_agr[is_fiq] = 0;
-        omap_inth_sir_update(s, is_fiq);
-        qemu_set_irq(s->parent_intr[is_fiq], 1);
-    }
-}
-
-#define INT_FALLING_EDGE	0
-#define INT_LOW_LEVEL		1
-
-static void omap_set_intr(void *opaque, int irq, int req)
-{
-    struct omap_intr_handler_s *ih = (struct omap_intr_handler_s *) opaque;
-    uint32_t rise;
-
-    struct omap_intr_handler_bank_s *bank = &ih->bank[irq >> 5];
-    int n = irq & 31;
-
-    if (req) {
-        rise = ~bank->irqs & (1 << n);
-        if (~bank->sens_edge & (1 << n))
-            rise &= ~bank->inputs;
-
-        bank->inputs |= (1 << n);
-        if (rise) {
-            bank->irqs |= rise;
-            omap_inth_update(ih, 0);
-            omap_inth_update(ih, 1);
-        }
-    } else {
-        rise = bank->sens_edge & bank->irqs & (1 << n);
-        bank->irqs &= ~rise;
-        bank->inputs &= ~(1 << n);
-    }
-}
-
-/* Simplified version with no edge detection */
-static void omap_set_intr_noedge(void *opaque, int irq, int req)
-{
-    struct omap_intr_handler_s *ih = (struct omap_intr_handler_s *) opaque;
-    uint32_t rise;
-
-    struct omap_intr_handler_bank_s *bank = &ih->bank[irq >> 5];
-    int n = irq & 31;
-
-    if (req) {
-        rise = ~bank->inputs & (1 << n);
-        if (rise) {
-            bank->irqs |= bank->inputs |= rise;
-            omap_inth_update(ih, 0);
-            omap_inth_update(ih, 1);
-        }
-    } else
-        bank->irqs = (bank->inputs &= ~(1 << n)) | bank->swi;
-}
-
-static uint32_t omap_inth_read(void *opaque, target_phys_addr_t addr)
-{
-    struct omap_intr_handler_s *s = (struct omap_intr_handler_s *) opaque;
-    int i, offset = addr;
-    int bank_no = offset >> 8;
-    int line_no;
-    struct omap_intr_handler_bank_s *bank = &s->bank[bank_no];
-    offset &= 0xff;
-
-    switch (offset) {
-    case 0x00:	/* ITR */
-        return bank->irqs;
-
-    case 0x04:	/* MIR */
-        return bank->mask;
-
-    case 0x10:	/* SIR_IRQ_CODE */
-    case 0x14:  /* SIR_FIQ_CODE */
-        if (bank_no != 0)
-            break;
-        line_no = s->sir_intr[(offset - 0x10) >> 2];
-        bank = &s->bank[line_no >> 5];
-        i = line_no & 31;
-        if (((bank->sens_edge >> i) & 1) == INT_FALLING_EDGE)
-            bank->irqs &= ~(1 << i);
-        return line_no;
-
-    case 0x18:	/* CONTROL_REG */
-        if (bank_no != 0)
-            break;
-        return 0;
-
-    case 0x1c:	/* ILR0 */
-    case 0x20:	/* ILR1 */
-    case 0x24:	/* ILR2 */
-    case 0x28:	/* ILR3 */
-    case 0x2c:	/* ILR4 */
-    case 0x30:	/* ILR5 */
-    case 0x34:	/* ILR6 */
-    case 0x38:	/* ILR7 */
-    case 0x3c:	/* ILR8 */
-    case 0x40:	/* ILR9 */
-    case 0x44:	/* ILR10 */
-    case 0x48:	/* ILR11 */
-    case 0x4c:	/* ILR12 */
-    case 0x50:	/* ILR13 */
-    case 0x54:	/* ILR14 */
-    case 0x58:	/* ILR15 */
-    case 0x5c:	/* ILR16 */
-    case 0x60:	/* ILR17 */
-    case 0x64:	/* ILR18 */
-    case 0x68:	/* ILR19 */
-    case 0x6c:	/* ILR20 */
-    case 0x70:	/* ILR21 */
-    case 0x74:	/* ILR22 */
-    case 0x78:	/* ILR23 */
-    case 0x7c:	/* ILR24 */
-    case 0x80:	/* ILR25 */
-    case 0x84:	/* ILR26 */
-    case 0x88:	/* ILR27 */
-    case 0x8c:	/* ILR28 */
-    case 0x90:	/* ILR29 */
-    case 0x94:	/* ILR30 */
-    case 0x98:	/* ILR31 */
-        i = (offset - 0x1c) >> 2;
-        return (bank->priority[i] << 2) |
-                (((bank->sens_edge >> i) & 1) << 1) |
-                ((bank->fiq >> i) & 1);
-
-    case 0x9c:	/* ISR */
-        return 0x00000000;
-
-    }
-    OMAP_BAD_REG(addr);
-    return 0;
-}
-
-static void omap_inth_write(void *opaque, target_phys_addr_t addr,
-                uint32_t value)
-{
-    struct omap_intr_handler_s *s = (struct omap_intr_handler_s *) opaque;
-    int i, offset = addr;
-    int bank_no = offset >> 8;
-    struct omap_intr_handler_bank_s *bank = &s->bank[bank_no];
-    offset &= 0xff;
-
-    switch (offset) {
-    case 0x00:	/* ITR */
-        /* Important: ignore the clearing if the IRQ is level-triggered and
-           the input bit is 1 */
-        bank->irqs &= value | (bank->inputs & bank->sens_edge);
-        return;
-
-    case 0x04:	/* MIR */
-        bank->mask = value;
-        omap_inth_update(s, 0);
-        omap_inth_update(s, 1);
-        return;
-
-    case 0x10:	/* SIR_IRQ_CODE */
-    case 0x14:	/* SIR_FIQ_CODE */
-        OMAP_RO_REG(addr);
-        break;
-
-    case 0x18:	/* CONTROL_REG */
-        if (bank_no != 0)
-            break;
-        if (value & 2) {
-            qemu_set_irq(s->parent_intr[1], 0);
-            s->new_agr[1] = ~0;
-            omap_inth_update(s, 1);
-        }
-        if (value & 1) {
-            qemu_set_irq(s->parent_intr[0], 0);
-            s->new_agr[0] = ~0;
-            omap_inth_update(s, 0);
-        }
-        return;
-
-    case 0x1c:	/* ILR0 */
-    case 0x20:	/* ILR1 */
-    case 0x24:	/* ILR2 */
-    case 0x28:	/* ILR3 */
-    case 0x2c:	/* ILR4 */
-    case 0x30:	/* ILR5 */
-    case 0x34:	/* ILR6 */
-    case 0x38:	/* ILR7 */
-    case 0x3c:	/* ILR8 */
-    case 0x40:	/* ILR9 */
-    case 0x44:	/* ILR10 */
-    case 0x48:	/* ILR11 */
-    case 0x4c:	/* ILR12 */
-    case 0x50:	/* ILR13 */
-    case 0x54:	/* ILR14 */
-    case 0x58:	/* ILR15 */
-    case 0x5c:	/* ILR16 */
-    case 0x60:	/* ILR17 */
-    case 0x64:	/* ILR18 */
-    case 0x68:	/* ILR19 */
-    case 0x6c:	/* ILR20 */
-    case 0x70:	/* ILR21 */
-    case 0x74:	/* ILR22 */
-    case 0x78:	/* ILR23 */
-    case 0x7c:	/* ILR24 */
-    case 0x80:	/* ILR25 */
-    case 0x84:	/* ILR26 */
-    case 0x88:	/* ILR27 */
-    case 0x8c:	/* ILR28 */
-    case 0x90:	/* ILR29 */
-    case 0x94:	/* ILR30 */
-    case 0x98:	/* ILR31 */
-        i = (offset - 0x1c) >> 2;
-        bank->priority[i] = (value >> 2) & 0x1f;
-        bank->sens_edge &= ~(1 << i);
-        bank->sens_edge |= ((value >> 1) & 1) << i;
-        bank->fiq &= ~(1 << i);
-        bank->fiq |= (value & 1) << i;
-        return;
-
-    case 0x9c:	/* ISR */
-        for (i = 0; i < 32; i ++)
-            if (value & (1 << i)) {
-                omap_set_intr(s, 32 * bank_no + i, 1);
-                return;
-            }
-        return;
-    }
-    OMAP_BAD_REG(addr);
-}
-
-static CPUReadMemoryFunc * const omap_inth_readfn[] = {
-    omap_badwidth_read32,
-    omap_badwidth_read32,
-    omap_inth_read,
-};
-
-static CPUWriteMemoryFunc * const omap_inth_writefn[] = {
-    omap_inth_write,
-    omap_inth_write,
-    omap_inth_write,
-};
-
-void omap_inth_reset(struct omap_intr_handler_s *s)
-{
-    int i;
-
-    for (i = 0; i < s->nbanks; ++i){
-        s->bank[i].irqs = 0x00000000;
-        s->bank[i].mask = 0xffffffff;
-        s->bank[i].sens_edge = 0x00000000;
-        s->bank[i].fiq = 0x00000000;
-        s->bank[i].inputs = 0x00000000;
-        s->bank[i].swi = 0x00000000;
-        memset(s->bank[i].priority, 0, sizeof(s->bank[i].priority));
-
-        if (s->level_only)
-            s->bank[i].sens_edge = 0xffffffff;
-    }
-
-    s->new_agr[0] = ~0;
-    s->new_agr[1] = ~0;
-    s->sir_intr[0] = 0;
-    s->sir_intr[1] = 0;
-    s->autoidle = 0;
-    s->mask = ~0;
-
-    qemu_set_irq(s->parent_intr[0], 0);
-    qemu_set_irq(s->parent_intr[1], 0);
-}
-
-struct omap_intr_handler_s *omap_inth_init(target_phys_addr_t base,
-                unsigned long size, unsigned char nbanks, qemu_irq **pins,
-                qemu_irq parent_irq, qemu_irq parent_fiq, omap_clk clk)
-{
-    int iomemtype;
-    struct omap_intr_handler_s *s = (struct omap_intr_handler_s *)
-            qemu_mallocz(sizeof(struct omap_intr_handler_s) +
-                            sizeof(struct omap_intr_handler_bank_s) * nbanks);
-
-    s->parent_intr[0] = parent_irq;
-    s->parent_intr[1] = parent_fiq;
-    s->nbanks = nbanks;
-    s->pins = qemu_allocate_irqs(omap_set_intr, s, nbanks * 32);
-    if (pins)
-        *pins = s->pins;
-
-    omap_inth_reset(s);
-
-    iomemtype = cpu_register_io_memory(omap_inth_readfn,
-                    omap_inth_writefn, s);
-    cpu_register_physical_memory(base, size, iomemtype);
-
-    return s;
-}
-
-static uint32_t omap2_inth_read(void *opaque, target_phys_addr_t addr)
-{
-    struct omap_intr_handler_s *s = (struct omap_intr_handler_s *) opaque;
-    int offset = addr;
-    int bank_no, line_no;
-    struct omap_intr_handler_bank_s *bank = NULL;
-
-    if ((offset & 0xf80) == 0x80) {
-        bank_no = (offset & 0x60) >> 5;
-        if (bank_no < s->nbanks) {
-            offset &= ~0x60;
-            bank = &s->bank[bank_no];
-        }
-    }
-
-    switch (offset) {
-    case 0x00:	/* INTC_REVISION */
-        return 0x21;
-
-    case 0x10:	/* INTC_SYSCONFIG */
-        return (s->autoidle >> 2) & 1;
-
-    case 0x14:	/* INTC_SYSSTATUS */
-        return 1;						/* RESETDONE */
-
-    case 0x40:	/* INTC_SIR_IRQ */
-        return s->sir_intr[0];
-
-    case 0x44:	/* INTC_SIR_FIQ */
-        return s->sir_intr[1];
-
-    case 0x48:	/* INTC_CONTROL */
-        return (!s->mask) << 2;					/* GLOBALMASK */
-
-    case 0x4c:	/* INTC_PROTECTION */
-        return 0;
-
-    case 0x50:	/* INTC_IDLE */
-        return s->autoidle & 3;
-
-    /* Per-bank registers */
-    case 0x80:	/* INTC_ITR */
-        return bank->inputs;
-
-    case 0x84:	/* INTC_MIR */
-        return bank->mask;
-
-    case 0x88:	/* INTC_MIR_CLEAR */
-    case 0x8c:	/* INTC_MIR_SET */
-        return 0;
-
-    case 0x90:	/* INTC_ISR_SET */
-        return bank->swi;
-
-    case 0x94:	/* INTC_ISR_CLEAR */
-        return 0;
-
-    case 0x98:	/* INTC_PENDING_IRQ */
-        return bank->irqs & ~bank->mask & ~bank->fiq;
-
-    case 0x9c:	/* INTC_PENDING_FIQ */
-        return bank->irqs & ~bank->mask & bank->fiq;
-
-    /* Per-line registers */
-    case 0x100 ... 0x300:	/* INTC_ILR */
-        bank_no = (offset - 0x100) >> 7;
-        if (bank_no > s->nbanks)
-            break;
-        bank = &s->bank[bank_no];
-        line_no = (offset & 0x7f) >> 2;
-        return (bank->priority[line_no] << 2) |
-                ((bank->fiq >> line_no) & 1);
-    }
-    OMAP_BAD_REG(addr);
-    return 0;
-}
-
-static void omap2_inth_write(void *opaque, target_phys_addr_t addr,
-                uint32_t value)
-{
-    struct omap_intr_handler_s *s = (struct omap_intr_handler_s *) opaque;
-    int offset = addr;
-    int bank_no, line_no;
-    struct omap_intr_handler_bank_s *bank = NULL;
-
-    if ((offset & 0xf80) == 0x80) {
-        bank_no = (offset & 0x60) >> 5;
-        if (bank_no < s->nbanks) {
-            offset &= ~0x60;
-            bank = &s->bank[bank_no];
-        }
-    }
-
-    switch (offset) {
-    case 0x10:	/* INTC_SYSCONFIG */
-        s->autoidle &= 4;
-        s->autoidle |= (value & 1) << 2;
-        if (value & 2)						/* SOFTRESET */
-            omap_inth_reset(s);
-        return;
-
-    case 0x48:	/* INTC_CONTROL */
-        s->mask = (value & 4) ? 0 : ~0;				/* GLOBALMASK */
-        if (value & 2) {					/* NEWFIQAGR */
-            qemu_set_irq(s->parent_intr[1], 0);
-            s->new_agr[1] = ~0;
-            omap_inth_update(s, 1);
-        }
-        if (value & 1) {					/* NEWIRQAGR */
-            qemu_set_irq(s->parent_intr[0], 0);
-            s->new_agr[0] = ~0;
-            omap_inth_update(s, 0);
-        }
-        return;
-
-    case 0x4c:	/* INTC_PROTECTION */
-        /* TODO: Make a bitmap (or sizeof(char)map) of access privileges
-         * for every register, see Chapter 3 and 4 for privileged mode.  */
-        if (value & 1)
-            fprintf(stderr, "%s: protection mode enable attempt\n",
-                            __FUNCTION__);
-        return;
-
-    case 0x50:	/* INTC_IDLE */
-        s->autoidle &= ~3;
-        s->autoidle |= value & 3;
-        return;
-
-    /* Per-bank registers */
-    case 0x84:	/* INTC_MIR */
-        bank->mask = value;
-        omap_inth_update(s, 0);
-        omap_inth_update(s, 1);
-        return;
-
-    case 0x88:	/* INTC_MIR_CLEAR */
-        bank->mask &= ~value;
-        omap_inth_update(s, 0);
-        omap_inth_update(s, 1);
-        return;
-
-    case 0x8c:	/* INTC_MIR_SET */
-        bank->mask |= value;
-        return;
-
-    case 0x90:	/* INTC_ISR_SET */
-        bank->irqs |= bank->swi |= value;
-        omap_inth_update(s, 0);
-        omap_inth_update(s, 1);
-        return;
-
-    case 0x94:	/* INTC_ISR_CLEAR */
-        bank->swi &= ~value;
-        bank->irqs = bank->swi & bank->inputs;
-        return;
-
-    /* Per-line registers */
-    case 0x100 ... 0x300:	/* INTC_ILR */
-        bank_no = (offset - 0x100) >> 7;
-        if (bank_no > s->nbanks)
-            break;
-        bank = &s->bank[bank_no];
-        line_no = (offset & 0x7f) >> 2;
-        bank->priority[line_no] = (value >> 2) & 0x3f;
-        bank->fiq &= ~(1 << line_no);
-        bank->fiq |= (value & 1) << line_no;
-        return;
-
-    case 0x00:	/* INTC_REVISION */
-    case 0x14:	/* INTC_SYSSTATUS */
-    case 0x40:	/* INTC_SIR_IRQ */
-    case 0x44:	/* INTC_SIR_FIQ */
-    case 0x80:	/* INTC_ITR */
-    case 0x98:	/* INTC_PENDING_IRQ */
-    case 0x9c:	/* INTC_PENDING_FIQ */
-        OMAP_RO_REG(addr);
-        return;
-    }
-    OMAP_BAD_REG(addr);
-}
-
-static CPUReadMemoryFunc * const omap2_inth_readfn[] = {
-    omap_badwidth_read32,
-    omap_badwidth_read32,
-    omap2_inth_read,
-};
-
-static CPUWriteMemoryFunc * const omap2_inth_writefn[] = {
-    omap2_inth_write,
-    omap2_inth_write,
-    omap2_inth_write,
-};
-
-struct omap_intr_handler_s *omap2_inth_init(target_phys_addr_t base,
-                int size, int nbanks, qemu_irq **pins,
-                qemu_irq parent_irq, qemu_irq parent_fiq,
-                omap_clk fclk, omap_clk iclk)
-{
-    int iomemtype;
-    struct omap_intr_handler_s *s = (struct omap_intr_handler_s *)
-            qemu_mallocz(sizeof(struct omap_intr_handler_s) +
-                            sizeof(struct omap_intr_handler_bank_s) * nbanks);
-
-    s->parent_intr[0] = parent_irq;
-    s->parent_intr[1] = parent_fiq;
-    s->nbanks = nbanks;
-    s->level_only = 1;
-    s->pins = qemu_allocate_irqs(omap_set_intr_noedge, s, nbanks * 32);
-    if (pins)
-        *pins = s->pins;
-
-    omap_inth_reset(s);
-
-    iomemtype = cpu_register_io_memory(omap2_inth_readfn,
-                    omap2_inth_writefn, s);
-    cpu_register_physical_memory(base, size, iomemtype);
-
-    return s;
-}
-
 /* MPU OS timers */
 struct omap_mpu_timer_s {
     qemu_irq irq;
@@ -4485,8 +3913,8 @@ struct omap_mpu_state_s *omap310_mpu_init(unsigned long sdram_size,
                     cpu_irq[ARM_PIC_CPU_IRQ], cpu_irq[ARM_PIC_CPU_FIQ],
                     omap_findclk(s, "arminth_ck"));
     s->ih[1] = omap_inth_init(0xfffe0000, 0x800, 1, &s->irq[1],
-                    s->ih[0]->pins[OMAP_INT_15XX_IH2_IRQ], NULL,
-                    omap_findclk(s, "arminth_ck"));
+                    omap_inth_get_pin(s->ih[0], OMAP_INT_15XX_IH2_IRQ),
+		    NULL, omap_findclk(s, "arminth_ck"));
 
     for (i = 0; i < 6; i ++)
         dma_irqs[i] =
diff --git a/hw/omap_intc.c b/hw/omap_intc.c
new file mode 100644
index 000000000..59893b7ad
--- /dev/null
+++ b/hw/omap_intc.c
@@ -0,0 +1,598 @@
+/*
+ * TI OMAP interrupt controller emulation.
+ *
+ * Copyright (C) 2006-2008 Andrzej Zaborowski  <balrog@zabor.org>
+ * Copyright (C) 2007-2008 Nokia Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 or
+ * (at your option) version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+#include "hw.h"
+#include "omap.h"
+
+/* Interrupt Handlers */
+struct omap_intr_handler_bank_s {
+    uint32_t irqs;
+    uint32_t inputs;
+    uint32_t mask;
+    uint32_t fiq;
+    uint32_t sens_edge;
+    uint32_t swi;
+    unsigned char priority[32];
+};
+
+struct omap_intr_handler_s {
+    qemu_irq *pins;
+    qemu_irq parent_intr[2];
+    unsigned char nbanks;
+    int level_only;
+
+    /* state */
+    uint32_t new_agr[2];
+    int sir_intr[2];
+    int autoidle;
+    uint32_t mask;
+    struct omap_intr_handler_bank_s bank[];
+};
+
+inline qemu_irq omap_inth_get_pin(struct omap_intr_handler_s *s, int n)
+{
+    return s->pins[n];
+}
+
+static void omap_inth_sir_update(struct omap_intr_handler_s *s, int is_fiq)
+{
+    int i, j, sir_intr, p_intr, p, f;
+    uint32_t level;
+    sir_intr = 0;
+    p_intr = 255;
+
+    /* Find the interrupt line with the highest dynamic priority.
+     * Note: 0 denotes the hightest priority.
+     * If all interrupts have the same priority, the default order is IRQ_N,
+     * IRQ_N-1,...,IRQ_0. */
+    for (j = 0; j < s->nbanks; ++j) {
+        level = s->bank[j].irqs & ~s->bank[j].mask &
+                (is_fiq ? s->bank[j].fiq : ~s->bank[j].fiq);
+        for (f = ffs(level), i = f - 1, level >>= f - 1; f; i += f,
+                        level >>= f) {
+            p = s->bank[j].priority[i];
+            if (p <= p_intr) {
+                p_intr = p;
+                sir_intr = 32 * j + i;
+            }
+            f = ffs(level >> 1);
+        }
+    }
+    s->sir_intr[is_fiq] = sir_intr;
+}
+
+static inline void omap_inth_update(struct omap_intr_handler_s *s, int is_fiq)
+{
+    int i;
+    uint32_t has_intr = 0;
+
+    for (i = 0; i < s->nbanks; ++i)
+        has_intr |= s->bank[i].irqs & ~s->bank[i].mask &
+                (is_fiq ? s->bank[i].fiq : ~s->bank[i].fiq);
+
+    if (s->new_agr[is_fiq] & has_intr & s->mask) {
+        s->new_agr[is_fiq] = 0;
+        omap_inth_sir_update(s, is_fiq);
+        qemu_set_irq(s->parent_intr[is_fiq], 1);
+    }
+}
+
+#define INT_FALLING_EDGE	0
+#define INT_LOW_LEVEL		1
+
+static void omap_set_intr(void *opaque, int irq, int req)
+{
+    struct omap_intr_handler_s *ih = (struct omap_intr_handler_s *) opaque;
+    uint32_t rise;
+
+    struct omap_intr_handler_bank_s *bank = &ih->bank[irq >> 5];
+    int n = irq & 31;
+
+    if (req) {
+        rise = ~bank->irqs & (1 << n);
+        if (~bank->sens_edge & (1 << n))
+            rise &= ~bank->inputs;
+
+        bank->inputs |= (1 << n);
+        if (rise) {
+            bank->irqs |= rise;
+            omap_inth_update(ih, 0);
+            omap_inth_update(ih, 1);
+        }
+    } else {
+        rise = bank->sens_edge & bank->irqs & (1 << n);
+        bank->irqs &= ~rise;
+        bank->inputs &= ~(1 << n);
+    }
+}
+
+/* Simplified version with no edge detection */
+static void omap_set_intr_noedge(void *opaque, int irq, int req)
+{
+    struct omap_intr_handler_s *ih = (struct omap_intr_handler_s *) opaque;
+    uint32_t rise;
+
+    struct omap_intr_handler_bank_s *bank = &ih->bank[irq >> 5];
+    int n = irq & 31;
+
+    if (req) {
+        rise = ~bank->inputs & (1 << n);
+        if (rise) {
+            bank->irqs |= bank->inputs |= rise;
+            omap_inth_update(ih, 0);
+            omap_inth_update(ih, 1);
+        }
+    } else
+        bank->irqs = (bank->inputs &= ~(1 << n)) | bank->swi;
+}
+
+static uint32_t omap_inth_read(void *opaque, target_phys_addr_t addr)
+{
+    struct omap_intr_handler_s *s = (struct omap_intr_handler_s *) opaque;
+    int i, offset = addr;
+    int bank_no = offset >> 8;
+    int line_no;
+    struct omap_intr_handler_bank_s *bank = &s->bank[bank_no];
+    offset &= 0xff;
+
+    switch (offset) {
+    case 0x00:	/* ITR */
+        return bank->irqs;
+
+    case 0x04:	/* MIR */
+        return bank->mask;
+
+    case 0x10:	/* SIR_IRQ_CODE */
+    case 0x14:  /* SIR_FIQ_CODE */
+        if (bank_no != 0)
+            break;
+        line_no = s->sir_intr[(offset - 0x10) >> 2];
+        bank = &s->bank[line_no >> 5];
+        i = line_no & 31;
+        if (((bank->sens_edge >> i) & 1) == INT_FALLING_EDGE)
+            bank->irqs &= ~(1 << i);
+        return line_no;
+
+    case 0x18:	/* CONTROL_REG */
+        if (bank_no != 0)
+            break;
+        return 0;
+
+    case 0x1c:	/* ILR0 */
+    case 0x20:	/* ILR1 */
+    case 0x24:	/* ILR2 */
+    case 0x28:	/* ILR3 */
+    case 0x2c:	/* ILR4 */
+    case 0x30:	/* ILR5 */
+    case 0x34:	/* ILR6 */
+    case 0x38:	/* ILR7 */
+    case 0x3c:	/* ILR8 */
+    case 0x40:	/* ILR9 */
+    case 0x44:	/* ILR10 */
+    case 0x48:	/* ILR11 */
+    case 0x4c:	/* ILR12 */
+    case 0x50:	/* ILR13 */
+    case 0x54:	/* ILR14 */
+    case 0x58:	/* ILR15 */
+    case 0x5c:	/* ILR16 */
+    case 0x60:	/* ILR17 */
+    case 0x64:	/* ILR18 */
+    case 0x68:	/* ILR19 */
+    case 0x6c:	/* ILR20 */
+    case 0x70:	/* ILR21 */
+    case 0x74:	/* ILR22 */
+    case 0x78:	/* ILR23 */
+    case 0x7c:	/* ILR24 */
+    case 0x80:	/* ILR25 */
+    case 0x84:	/* ILR26 */
+    case 0x88:	/* ILR27 */
+    case 0x8c:	/* ILR28 */
+    case 0x90:	/* ILR29 */
+    case 0x94:	/* ILR30 */
+    case 0x98:	/* ILR31 */
+        i = (offset - 0x1c) >> 2;
+        return (bank->priority[i] << 2) |
+                (((bank->sens_edge >> i) & 1) << 1) |
+                ((bank->fiq >> i) & 1);
+
+    case 0x9c:	/* ISR */
+        return 0x00000000;
+
+    }
+    OMAP_BAD_REG(addr);
+    return 0;
+}
+
+static void omap_inth_write(void *opaque, target_phys_addr_t addr,
+                uint32_t value)
+{
+    struct omap_intr_handler_s *s = (struct omap_intr_handler_s *) opaque;
+    int i, offset = addr;
+    int bank_no = offset >> 8;
+    struct omap_intr_handler_bank_s *bank = &s->bank[bank_no];
+    offset &= 0xff;
+
+    switch (offset) {
+    case 0x00:	/* ITR */
+        /* Important: ignore the clearing if the IRQ is level-triggered and
+           the input bit is 1 */
+        bank->irqs &= value | (bank->inputs & bank->sens_edge);
+        return;
+
+    case 0x04:	/* MIR */
+        bank->mask = value;
+        omap_inth_update(s, 0);
+        omap_inth_update(s, 1);
+        return;
+
+    case 0x10:	/* SIR_IRQ_CODE */
+    case 0x14:	/* SIR_FIQ_CODE */
+        OMAP_RO_REG(addr);
+        break;
+
+    case 0x18:	/* CONTROL_REG */
+        if (bank_no != 0)
+            break;
+        if (value & 2) {
+            qemu_set_irq(s->parent_intr[1], 0);
+            s->new_agr[1] = ~0;
+            omap_inth_update(s, 1);
+        }
+        if (value & 1) {
+            qemu_set_irq(s->parent_intr[0], 0);
+            s->new_agr[0] = ~0;
+            omap_inth_update(s, 0);
+        }
+        return;
+
+    case 0x1c:	/* ILR0 */
+    case 0x20:	/* ILR1 */
+    case 0x24:	/* ILR2 */
+    case 0x28:	/* ILR3 */
+    case 0x2c:	/* ILR4 */
+    case 0x30:	/* ILR5 */
+    case 0x34:	/* ILR6 */
+    case 0x38:	/* ILR7 */
+    case 0x3c:	/* ILR8 */
+    case 0x40:	/* ILR9 */
+    case 0x44:	/* ILR10 */
+    case 0x48:	/* ILR11 */
+    case 0x4c:	/* ILR12 */
+    case 0x50:	/* ILR13 */
+    case 0x54:	/* ILR14 */
+    case 0x58:	/* ILR15 */
+    case 0x5c:	/* ILR16 */
+    case 0x60:	/* ILR17 */
+    case 0x64:	/* ILR18 */
+    case 0x68:	/* ILR19 */
+    case 0x6c:	/* ILR20 */
+    case 0x70:	/* ILR21 */
+    case 0x74:	/* ILR22 */
+    case 0x78:	/* ILR23 */
+    case 0x7c:	/* ILR24 */
+    case 0x80:	/* ILR25 */
+    case 0x84:	/* ILR26 */
+    case 0x88:	/* ILR27 */
+    case 0x8c:	/* ILR28 */
+    case 0x90:	/* ILR29 */
+    case 0x94:	/* ILR30 */
+    case 0x98:	/* ILR31 */
+        i = (offset - 0x1c) >> 2;
+        bank->priority[i] = (value >> 2) & 0x1f;
+        bank->sens_edge &= ~(1 << i);
+        bank->sens_edge |= ((value >> 1) & 1) << i;
+        bank->fiq &= ~(1 << i);
+        bank->fiq |= (value & 1) << i;
+        return;
+
+    case 0x9c:	/* ISR */
+        for (i = 0; i < 32; i ++)
+            if (value & (1 << i)) {
+                omap_set_intr(s, 32 * bank_no + i, 1);
+                return;
+            }
+        return;
+    }
+    OMAP_BAD_REG(addr);
+}
+
+static CPUReadMemoryFunc * const omap_inth_readfn[] = {
+    omap_badwidth_read32,
+    omap_badwidth_read32,
+    omap_inth_read,
+};
+
+static CPUWriteMemoryFunc * const omap_inth_writefn[] = {
+    omap_inth_write,
+    omap_inth_write,
+    omap_inth_write,
+};
+
+void omap_inth_reset(struct omap_intr_handler_s *s)
+{
+    int i;
+
+    for (i = 0; i < s->nbanks; ++i){
+        s->bank[i].irqs = 0x00000000;
+        s->bank[i].mask = 0xffffffff;
+        s->bank[i].sens_edge = 0x00000000;
+        s->bank[i].fiq = 0x00000000;
+        s->bank[i].inputs = 0x00000000;
+        s->bank[i].swi = 0x00000000;
+        memset(s->bank[i].priority, 0, sizeof(s->bank[i].priority));
+
+        if (s->level_only)
+            s->bank[i].sens_edge = 0xffffffff;
+    }
+
+    s->new_agr[0] = ~0;
+    s->new_agr[1] = ~0;
+    s->sir_intr[0] = 0;
+    s->sir_intr[1] = 0;
+    s->autoidle = 0;
+    s->mask = ~0;
+
+    qemu_set_irq(s->parent_intr[0], 0);
+    qemu_set_irq(s->parent_intr[1], 0);
+}
+
+struct omap_intr_handler_s *omap_inth_init(target_phys_addr_t base,
+                unsigned long size, unsigned char nbanks, qemu_irq **pins,
+                qemu_irq parent_irq, qemu_irq parent_fiq, omap_clk clk)
+{
+    int iomemtype;
+    struct omap_intr_handler_s *s = (struct omap_intr_handler_s *)
+            qemu_mallocz(sizeof(struct omap_intr_handler_s) +
+                            sizeof(struct omap_intr_handler_bank_s) * nbanks);
+
+    s->parent_intr[0] = parent_irq;
+    s->parent_intr[1] = parent_fiq;
+    s->nbanks = nbanks;
+    s->pins = qemu_allocate_irqs(omap_set_intr, s, nbanks * 32);
+    if (pins)
+        *pins = s->pins;
+
+    omap_inth_reset(s);
+
+    iomemtype = cpu_register_io_memory(omap_inth_readfn,
+                    omap_inth_writefn, s);
+    cpu_register_physical_memory(base, size, iomemtype);
+
+    return s;
+}
+
+static uint32_t omap2_inth_read(void *opaque, target_phys_addr_t addr)
+{
+    struct omap_intr_handler_s *s = (struct omap_intr_handler_s *) opaque;
+    int offset = addr;
+    int bank_no, line_no;
+    struct omap_intr_handler_bank_s *bank = NULL;
+
+    if ((offset & 0xf80) == 0x80) {
+        bank_no = (offset & 0x60) >> 5;
+        if (bank_no < s->nbanks) {
+            offset &= ~0x60;
+            bank = &s->bank[bank_no];
+        }
+    }
+
+    switch (offset) {
+    case 0x00:	/* INTC_REVISION */
+        return 0x21;
+
+    case 0x10:	/* INTC_SYSCONFIG */
+        return (s->autoidle >> 2) & 1;
+
+    case 0x14:	/* INTC_SYSSTATUS */
+        return 1;						/* RESETDONE */
+
+    case 0x40:	/* INTC_SIR_IRQ */
+        return s->sir_intr[0];
+
+    case 0x44:	/* INTC_SIR_FIQ */
+        return s->sir_intr[1];
+
+    case 0x48:	/* INTC_CONTROL */
+        return (!s->mask) << 2;					/* GLOBALMASK */
+
+    case 0x4c:	/* INTC_PROTECTION */
+        return 0;
+
+    case 0x50:	/* INTC_IDLE */
+        return s->autoidle & 3;
+
+    /* Per-bank registers */
+    case 0x80:	/* INTC_ITR */
+        return bank->inputs;
+
+    case 0x84:	/* INTC_MIR */
+        return bank->mask;
+
+    case 0x88:	/* INTC_MIR_CLEAR */
+    case 0x8c:	/* INTC_MIR_SET */
+        return 0;
+
+    case 0x90:	/* INTC_ISR_SET */
+        return bank->swi;
+
+    case 0x94:	/* INTC_ISR_CLEAR */
+        return 0;
+
+    case 0x98:	/* INTC_PENDING_IRQ */
+        return bank->irqs & ~bank->mask & ~bank->fiq;
+
+    case 0x9c:	/* INTC_PENDING_FIQ */
+        return bank->irqs & ~bank->mask & bank->fiq;
+
+    /* Per-line registers */
+    case 0x100 ... 0x300:	/* INTC_ILR */
+        bank_no = (offset - 0x100) >> 7;
+        if (bank_no > s->nbanks)
+            break;
+        bank = &s->bank[bank_no];
+        line_no = (offset & 0x7f) >> 2;
+        return (bank->priority[line_no] << 2) |
+                ((bank->fiq >> line_no) & 1);
+    }
+    OMAP_BAD_REG(addr);
+    return 0;
+}
+
+static void omap2_inth_write(void *opaque, target_phys_addr_t addr,
+                uint32_t value)
+{
+    struct omap_intr_handler_s *s = (struct omap_intr_handler_s *) opaque;
+    int offset = addr;
+    int bank_no, line_no;
+    struct omap_intr_handler_bank_s *bank = NULL;
+
+    if ((offset & 0xf80) == 0x80) {
+        bank_no = (offset & 0x60) >> 5;
+        if (bank_no < s->nbanks) {
+            offset &= ~0x60;
+            bank = &s->bank[bank_no];
+        }
+    }
+
+    switch (offset) {
+    case 0x10:	/* INTC_SYSCONFIG */
+        s->autoidle &= 4;
+        s->autoidle |= (value & 1) << 2;
+        if (value & 2)						/* SOFTRESET */
+            omap_inth_reset(s);
+        return;
+
+    case 0x48:	/* INTC_CONTROL */
+        s->mask = (value & 4) ? 0 : ~0;				/* GLOBALMASK */
+        if (value & 2) {					/* NEWFIQAGR */
+            qemu_set_irq(s->parent_intr[1], 0);
+            s->new_agr[1] = ~0;
+            omap_inth_update(s, 1);
+        }
+        if (value & 1) {					/* NEWIRQAGR */
+            qemu_set_irq(s->parent_intr[0], 0);
+            s->new_agr[0] = ~0;
+            omap_inth_update(s, 0);
+        }
+        return;
+
+    case 0x4c:	/* INTC_PROTECTION */
+        /* TODO: Make a bitmap (or sizeof(char)map) of access privileges
+         * for every register, see Chapter 3 and 4 for privileged mode.  */
+        if (value & 1)
+            fprintf(stderr, "%s: protection mode enable attempt\n",
+                            __FUNCTION__);
+        return;
+
+    case 0x50:	/* INTC_IDLE */
+        s->autoidle &= ~3;
+        s->autoidle |= value & 3;
+        return;
+
+    /* Per-bank registers */
+    case 0x84:	/* INTC_MIR */
+        bank->mask = value;
+        omap_inth_update(s, 0);
+        omap_inth_update(s, 1);
+        return;
+
+    case 0x88:	/* INTC_MIR_CLEAR */
+        bank->mask &= ~value;
+        omap_inth_update(s, 0);
+        omap_inth_update(s, 1);
+        return;
+
+    case 0x8c:	/* INTC_MIR_SET */
+        bank->mask |= value;
+        return;
+
+    case 0x90:	/* INTC_ISR_SET */
+        bank->irqs |= bank->swi |= value;
+        omap_inth_update(s, 0);
+        omap_inth_update(s, 1);
+        return;
+
+    case 0x94:	/* INTC_ISR_CLEAR */
+        bank->swi &= ~value;
+        bank->irqs = bank->swi & bank->inputs;
+        return;
+
+    /* Per-line registers */
+    case 0x100 ... 0x300:	/* INTC_ILR */
+        bank_no = (offset - 0x100) >> 7;
+        if (bank_no > s->nbanks)
+            break;
+        bank = &s->bank[bank_no];
+        line_no = (offset & 0x7f) >> 2;
+        bank->priority[line_no] = (value >> 2) & 0x3f;
+        bank->fiq &= ~(1 << line_no);
+        bank->fiq |= (value & 1) << line_no;
+        return;
+
+    case 0x00:	/* INTC_REVISION */
+    case 0x14:	/* INTC_SYSSTATUS */
+    case 0x40:	/* INTC_SIR_IRQ */
+    case 0x44:	/* INTC_SIR_FIQ */
+    case 0x80:	/* INTC_ITR */
+    case 0x98:	/* INTC_PENDING_IRQ */
+    case 0x9c:	/* INTC_PENDING_FIQ */
+        OMAP_RO_REG(addr);
+        return;
+    }
+    OMAP_BAD_REG(addr);
+}
+
+static CPUReadMemoryFunc * const omap2_inth_readfn[] = {
+    omap_badwidth_read32,
+    omap_badwidth_read32,
+    omap2_inth_read,
+};
+
+static CPUWriteMemoryFunc * const omap2_inth_writefn[] = {
+    omap2_inth_write,
+    omap2_inth_write,
+    omap2_inth_write,
+};
+
+struct omap_intr_handler_s *omap2_inth_init(target_phys_addr_t base,
+                int size, int nbanks, qemu_irq **pins,
+                qemu_irq parent_irq, qemu_irq parent_fiq,
+                omap_clk fclk, omap_clk iclk)
+{
+    int iomemtype;
+    struct omap_intr_handler_s *s = (struct omap_intr_handler_s *)
+            qemu_mallocz(sizeof(struct omap_intr_handler_s) +
+                            sizeof(struct omap_intr_handler_bank_s) * nbanks);
+
+    s->parent_intr[0] = parent_irq;
+    s->parent_intr[1] = parent_fiq;
+    s->nbanks = nbanks;
+    s->level_only = 1;
+    s->pins = qemu_allocate_irqs(omap_set_intr_noedge, s, nbanks * 32);
+    if (pins)
+        *pins = s->pins;
+
+    omap_inth_reset(s);
+
+    iomemtype = cpu_register_io_memory(omap2_inth_readfn,
+                    omap2_inth_writefn, s);
+    cpu_register_physical_memory(base, size, iomemtype);
+
+    return s;
+}