| /* |
| * QEMU Xilinx OPB Interrupt Controller. |
| * |
| * Copyright (c) 2009 Edgar E. Iglesias. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to deal |
| * in the Software without restriction, including without limitation the rights |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| * copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| * THE SOFTWARE. |
| */ |
| |
| #include "sysbus.h" |
| #include "hw.h" |
| |
| #define D(x) |
| |
| #define R_ISR 0 |
| #define R_IPR 1 |
| #define R_IER 2 |
| #define R_IAR 3 |
| #define R_SIE 4 |
| #define R_CIE 5 |
| #define R_IVR 6 |
| #define R_MER 7 |
| #define R_MAX 8 |
| |
| struct xlx_pic |
| { |
| SysBusDevice busdev; |
| MemoryRegion mmio; |
| qemu_irq parent_irq; |
| |
| /* Configuration reg chosen at synthesis-time. QEMU populates |
| the bits at board-setup. */ |
| uint32_t c_kind_of_intr; |
| |
| /* Runtime control registers. */ |
| uint32_t regs[R_MAX]; |
| }; |
| |
| static void update_irq(struct xlx_pic *p) |
| { |
| uint32_t i; |
| /* Update the pending register. */ |
| p->regs[R_IPR] = p->regs[R_ISR] & p->regs[R_IER]; |
| |
| /* Update the vector register. */ |
| for (i = 0; i < 32; i++) { |
| if (p->regs[R_IPR] & (1 << i)) |
| break; |
| } |
| if (i == 32) |
| i = ~0; |
| |
| p->regs[R_IVR] = i; |
| if ((p->regs[R_MER] & 1) && p->regs[R_IPR]) { |
| qemu_irq_raise(p->parent_irq); |
| } else { |
| qemu_irq_lower(p->parent_irq); |
| } |
| } |
| |
| static uint64_t |
| pic_read(void *opaque, target_phys_addr_t addr, unsigned int size) |
| { |
| struct xlx_pic *p = opaque; |
| uint32_t r = 0; |
| |
| addr >>= 2; |
| switch (addr) |
| { |
| default: |
| if (addr < ARRAY_SIZE(p->regs)) |
| r = p->regs[addr]; |
| break; |
| |
| } |
| D(printf("%s %x=%x\n", __func__, addr * 4, r)); |
| return r; |
| } |
| |
| static void |
| pic_write(void *opaque, target_phys_addr_t addr, |
| uint64_t val64, unsigned int size) |
| { |
| struct xlx_pic *p = opaque; |
| uint32_t value = val64; |
| |
| addr >>= 2; |
| D(qemu_log("%s addr=%x val=%x\n", __func__, addr * 4, value)); |
| switch (addr) |
| { |
| case R_IAR: |
| p->regs[R_ISR] &= ~value; /* ACK. */ |
| break; |
| case R_SIE: |
| p->regs[R_IER] |= value; /* Atomic set ie. */ |
| break; |
| case R_CIE: |
| p->regs[R_IER] &= ~value; /* Atomic clear ie. */ |
| break; |
| default: |
| if (addr < ARRAY_SIZE(p->regs)) |
| p->regs[addr] = value; |
| break; |
| } |
| update_irq(p); |
| } |
| |
| static const MemoryRegionOps pic_ops = { |
| .read = pic_read, |
| .write = pic_write, |
| .endianness = DEVICE_NATIVE_ENDIAN, |
| .valid = { |
| .min_access_size = 4, |
| .max_access_size = 4 |
| } |
| }; |
| |
| static void irq_handler(void *opaque, int irq, int level) |
| { |
| struct xlx_pic *p = opaque; |
| |
| if (!(p->regs[R_MER] & 2)) { |
| qemu_irq_lower(p->parent_irq); |
| return; |
| } |
| |
| /* Update source flops. Don't clear unless level triggered. |
| Edge triggered interrupts only go away when explicitely acked to |
| the interrupt controller. */ |
| if (!(p->c_kind_of_intr & (1 << irq)) || level) { |
| p->regs[R_ISR] &= ~(1 << irq); |
| p->regs[R_ISR] |= (level << irq); |
| } |
| update_irq(p); |
| } |
| |
| static int xilinx_intc_init(SysBusDevice *dev) |
| { |
| struct xlx_pic *p = FROM_SYSBUS(typeof (*p), dev); |
| |
| qdev_init_gpio_in(&dev->qdev, irq_handler, 32); |
| sysbus_init_irq(dev, &p->parent_irq); |
| |
| memory_region_init_io(&p->mmio, &pic_ops, p, "xilinx-pic", R_MAX * 4); |
| sysbus_init_mmio(dev, &p->mmio); |
| return 0; |
| } |
| |
| static SysBusDeviceInfo xilinx_intc_info = { |
| .init = xilinx_intc_init, |
| .qdev.name = "xilinx,intc", |
| .qdev.size = sizeof(struct xlx_pic), |
| .qdev.props = (Property[]) { |
| DEFINE_PROP_UINT32("kind-of-intr", struct xlx_pic, c_kind_of_intr, 0), |
| DEFINE_PROP_END_OF_LIST(), |
| } |
| }; |
| |
| static void xilinx_intc_register(void) |
| { |
| sysbus_register_withprop(&xilinx_intc_info); |
| } |
| |
| device_init(xilinx_intc_register) |