diff options
Diffstat (limited to 'hw/arm/pxa2xx_pic.c')
| -rw-r--r-- | hw/arm/pxa2xx_pic.c | 334 |
1 files changed, 334 insertions, 0 deletions
diff --git a/hw/arm/pxa2xx_pic.c b/hw/arm/pxa2xx_pic.c new file mode 100644 index 0000000000..145fc78c2f --- /dev/null +++ b/hw/arm/pxa2xx_pic.c @@ -0,0 +1,334 @@ +/* + * Intel XScale PXA Programmable Interrupt Controller. + * + * Copyright (c) 2006 Openedhand Ltd. + * Copyright (c) 2006 Thorsten Zitterell + * Written by Andrzej Zaborowski <balrog@zabor.org> + * + * This code is licensed under the GPL. + */ + +#include "hw/hw.h" +#include "hw/pxa.h" +#include "hw/sysbus.h" + +#define ICIP 0x00 /* Interrupt Controller IRQ Pending register */ +#define ICMR 0x04 /* Interrupt Controller Mask register */ +#define ICLR 0x08 /* Interrupt Controller Level register */ +#define ICFP 0x0c /* Interrupt Controller FIQ Pending register */ +#define ICPR 0x10 /* Interrupt Controller Pending register */ +#define ICCR 0x14 /* Interrupt Controller Control register */ +#define ICHP 0x18 /* Interrupt Controller Highest Priority register */ +#define IPR0 0x1c /* Interrupt Controller Priority register 0 */ +#define IPR31 0x98 /* Interrupt Controller Priority register 31 */ +#define ICIP2 0x9c /* Interrupt Controller IRQ Pending register 2 */ +#define ICMR2 0xa0 /* Interrupt Controller Mask register 2 */ +#define ICLR2 0xa4 /* Interrupt Controller Level register 2 */ +#define ICFP2 0xa8 /* Interrupt Controller FIQ Pending register 2 */ +#define ICPR2 0xac /* Interrupt Controller Pending register 2 */ +#define IPR32 0xb0 /* Interrupt Controller Priority register 32 */ +#define IPR39 0xcc /* Interrupt Controller Priority register 39 */ + +#define PXA2XX_PIC_SRCS 40 + +typedef struct { + SysBusDevice busdev; + MemoryRegion iomem; + ARMCPU *cpu; + uint32_t int_enabled[2]; + uint32_t int_pending[2]; + uint32_t is_fiq[2]; + uint32_t int_idle; + uint32_t priority[PXA2XX_PIC_SRCS]; +} PXA2xxPICState; + +static void pxa2xx_pic_update(void *opaque) +{ + uint32_t mask[2]; + PXA2xxPICState *s = (PXA2xxPICState *) opaque; + + if (s->cpu->env.halted) { + mask[0] = s->int_pending[0] & (s->int_enabled[0] | s->int_idle); + mask[1] = s->int_pending[1] & (s->int_enabled[1] | s->int_idle); + if (mask[0] || mask[1]) { + cpu_interrupt(&s->cpu->env, CPU_INTERRUPT_EXITTB); + } + } + + mask[0] = s->int_pending[0] & s->int_enabled[0]; + mask[1] = s->int_pending[1] & s->int_enabled[1]; + + if ((mask[0] & s->is_fiq[0]) || (mask[1] & s->is_fiq[1])) { + cpu_interrupt(&s->cpu->env, CPU_INTERRUPT_FIQ); + } else { + cpu_reset_interrupt(&s->cpu->env, CPU_INTERRUPT_FIQ); + } + + if ((mask[0] & ~s->is_fiq[0]) || (mask[1] & ~s->is_fiq[1])) { + cpu_interrupt(&s->cpu->env, CPU_INTERRUPT_HARD); + } else { + cpu_reset_interrupt(&s->cpu->env, CPU_INTERRUPT_HARD); + } +} + +/* Note: Here level means state of the signal on a pin, not + * IRQ/FIQ distinction as in PXA Developer Manual. */ +static void pxa2xx_pic_set_irq(void *opaque, int irq, int level) +{ + PXA2xxPICState *s = (PXA2xxPICState *) opaque; + int int_set = (irq >= 32); + irq &= 31; + + if (level) + s->int_pending[int_set] |= 1 << irq; + else + s->int_pending[int_set] &= ~(1 << irq); + + pxa2xx_pic_update(opaque); +} + +static inline uint32_t pxa2xx_pic_highest(PXA2xxPICState *s) { + int i, int_set, irq; + uint32_t bit, mask[2]; + uint32_t ichp = 0x003f003f; /* Both IDs invalid */ + + mask[0] = s->int_pending[0] & s->int_enabled[0]; + mask[1] = s->int_pending[1] & s->int_enabled[1]; + + for (i = PXA2XX_PIC_SRCS - 1; i >= 0; i --) { + irq = s->priority[i] & 0x3f; + if ((s->priority[i] & (1 << 31)) && irq < PXA2XX_PIC_SRCS) { + /* Source peripheral ID is valid. */ + bit = 1 << (irq & 31); + int_set = (irq >= 32); + + if (mask[int_set] & bit & s->is_fiq[int_set]) { + /* FIQ asserted */ + ichp &= 0xffff0000; + ichp |= (1 << 15) | irq; + } + + if (mask[int_set] & bit & ~s->is_fiq[int_set]) { + /* IRQ asserted */ + ichp &= 0x0000ffff; + ichp |= (1 << 31) | (irq << 16); + } + } + } + + return ichp; +} + +static uint64_t pxa2xx_pic_mem_read(void *opaque, hwaddr offset, + unsigned size) +{ + PXA2xxPICState *s = (PXA2xxPICState *) opaque; + + switch (offset) { + case ICIP: /* IRQ Pending register */ + return s->int_pending[0] & ~s->is_fiq[0] & s->int_enabled[0]; + case ICIP2: /* IRQ Pending register 2 */ + return s->int_pending[1] & ~s->is_fiq[1] & s->int_enabled[1]; + case ICMR: /* Mask register */ + return s->int_enabled[0]; + case ICMR2: /* Mask register 2 */ + return s->int_enabled[1]; + case ICLR: /* Level register */ + return s->is_fiq[0]; + case ICLR2: /* Level register 2 */ + return s->is_fiq[1]; + case ICCR: /* Idle mask */ + return (s->int_idle == 0); + case ICFP: /* FIQ Pending register */ + return s->int_pending[0] & s->is_fiq[0] & s->int_enabled[0]; + case ICFP2: /* FIQ Pending register 2 */ + return s->int_pending[1] & s->is_fiq[1] & s->int_enabled[1]; + case ICPR: /* Pending register */ + return s->int_pending[0]; + case ICPR2: /* Pending register 2 */ + return s->int_pending[1]; + case IPR0 ... IPR31: + return s->priority[0 + ((offset - IPR0 ) >> 2)]; + case IPR32 ... IPR39: + return s->priority[32 + ((offset - IPR32) >> 2)]; + case ICHP: /* Highest Priority register */ + return pxa2xx_pic_highest(s); + default: + printf("%s: Bad register offset " REG_FMT "\n", __FUNCTION__, offset); + return 0; + } +} + +static void pxa2xx_pic_mem_write(void *opaque, hwaddr offset, + uint64_t value, unsigned size) +{ + PXA2xxPICState *s = (PXA2xxPICState *) opaque; + + switch (offset) { + case ICMR: /* Mask register */ + s->int_enabled[0] = value; + break; + case ICMR2: /* Mask register 2 */ + s->int_enabled[1] = value; + break; + case ICLR: /* Level register */ + s->is_fiq[0] = value; + break; + case ICLR2: /* Level register 2 */ + s->is_fiq[1] = value; + break; + case ICCR: /* Idle mask */ + s->int_idle = (value & 1) ? 0 : ~0; + break; + case IPR0 ... IPR31: + s->priority[0 + ((offset - IPR0 ) >> 2)] = value & 0x8000003f; + break; + case IPR32 ... IPR39: + s->priority[32 + ((offset - IPR32) >> 2)] = value & 0x8000003f; + break; + default: + printf("%s: Bad register offset " REG_FMT "\n", __FUNCTION__, offset); + return; + } + pxa2xx_pic_update(opaque); +} + +/* Interrupt Controller Coprocessor Space Register Mapping */ +static const int pxa2xx_cp_reg_map[0x10] = { + [0x0 ... 0xf] = -1, + [0x0] = ICIP, + [0x1] = ICMR, + [0x2] = ICLR, + [0x3] = ICFP, + [0x4] = ICPR, + [0x5] = ICHP, + [0x6] = ICIP2, + [0x7] = ICMR2, + [0x8] = ICLR2, + [0x9] = ICFP2, + [0xa] = ICPR2, +}; + +static int pxa2xx_pic_cp_read(CPUARMState *env, const ARMCPRegInfo *ri, + uint64_t *value) +{ + int offset = pxa2xx_cp_reg_map[ri->crn]; + *value = pxa2xx_pic_mem_read(ri->opaque, offset, 4); + return 0; +} + +static int pxa2xx_pic_cp_write(CPUARMState *env, const ARMCPRegInfo *ri, + uint64_t value) +{ + int offset = pxa2xx_cp_reg_map[ri->crn]; + pxa2xx_pic_mem_write(ri->opaque, offset, value, 4); + return 0; +} + +#define REGINFO_FOR_PIC_CP(NAME, CRN) \ + { .name = NAME, .cp = 6, .crn = CRN, .crm = 0, .opc1 = 0, .opc2 = 0, \ + .access = PL1_RW, \ + .readfn = pxa2xx_pic_cp_read, .writefn = pxa2xx_pic_cp_write } + +static const ARMCPRegInfo pxa_pic_cp_reginfo[] = { + REGINFO_FOR_PIC_CP("ICIP", 0), + REGINFO_FOR_PIC_CP("ICMR", 1), + REGINFO_FOR_PIC_CP("ICLR", 2), + REGINFO_FOR_PIC_CP("ICFP", 3), + REGINFO_FOR_PIC_CP("ICPR", 4), + REGINFO_FOR_PIC_CP("ICHP", 5), + REGINFO_FOR_PIC_CP("ICIP2", 6), + REGINFO_FOR_PIC_CP("ICMR2", 7), + REGINFO_FOR_PIC_CP("ICLR2", 8), + REGINFO_FOR_PIC_CP("ICFP2", 9), + REGINFO_FOR_PIC_CP("ICPR2", 0xa), + REGINFO_SENTINEL +}; + +static const MemoryRegionOps pxa2xx_pic_ops = { + .read = pxa2xx_pic_mem_read, + .write = pxa2xx_pic_mem_write, + .endianness = DEVICE_NATIVE_ENDIAN, +}; + +static int pxa2xx_pic_post_load(void *opaque, int version_id) +{ + pxa2xx_pic_update(opaque); + return 0; +} + +DeviceState *pxa2xx_pic_init(hwaddr base, ARMCPU *cpu) +{ + CPUARMState *env = &cpu->env; + DeviceState *dev = qdev_create(NULL, "pxa2xx_pic"); + PXA2xxPICState *s = FROM_SYSBUS(PXA2xxPICState, SYS_BUS_DEVICE(dev)); + + s->cpu = cpu; + + s->int_pending[0] = 0; + s->int_pending[1] = 0; + s->int_enabled[0] = 0; + s->int_enabled[1] = 0; + s->is_fiq[0] = 0; + s->is_fiq[1] = 0; + + qdev_init_nofail(dev); + + qdev_init_gpio_in(dev, pxa2xx_pic_set_irq, PXA2XX_PIC_SRCS); + + /* Enable IC memory-mapped registers access. */ + memory_region_init_io(&s->iomem, &pxa2xx_pic_ops, s, + "pxa2xx-pic", 0x00100000); + sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->iomem); + sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, base); + + /* Enable IC coprocessor access. */ + define_arm_cp_regs_with_opaque(arm_env_get_cpu(env), pxa_pic_cp_reginfo, s); + + return dev; +} + +static VMStateDescription vmstate_pxa2xx_pic_regs = { + .name = "pxa2xx_pic", + .version_id = 0, + .minimum_version_id = 0, + .minimum_version_id_old = 0, + .post_load = pxa2xx_pic_post_load, + .fields = (VMStateField[]) { + VMSTATE_UINT32_ARRAY(int_enabled, PXA2xxPICState, 2), + VMSTATE_UINT32_ARRAY(int_pending, PXA2xxPICState, 2), + VMSTATE_UINT32_ARRAY(is_fiq, PXA2xxPICState, 2), + VMSTATE_UINT32(int_idle, PXA2xxPICState), + VMSTATE_UINT32_ARRAY(priority, PXA2xxPICState, PXA2XX_PIC_SRCS), + VMSTATE_END_OF_LIST(), + }, +}; + +static int pxa2xx_pic_initfn(SysBusDevice *dev) +{ + return 0; +} + +static void pxa2xx_pic_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); + + k->init = pxa2xx_pic_initfn; + dc->desc = "PXA2xx PIC"; + dc->vmsd = &vmstate_pxa2xx_pic_regs; +} + +static const TypeInfo pxa2xx_pic_info = { + .name = "pxa2xx_pic", + .parent = TYPE_SYS_BUS_DEVICE, + .instance_size = sizeof(PXA2xxPICState), + .class_init = pxa2xx_pic_class_init, +}; + +static void pxa2xx_pic_register_types(void) +{ + type_register_static(&pxa2xx_pic_info); +} + +type_init(pxa2xx_pic_register_types) |