1 /* 2 * LED, Switch and Debug control registers for ARM Integrator Boards 3 * 4 * This is currently a stub for this functionality but at least 5 * ensures something other than unassigned_mem_read() handles access 6 * to this area. 7 * 8 * The real h/w is described at: 9 * http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0159b/Babbfijf.html 10 * 11 * Copyright (c) 2013 Alex Bennée <alex@bennee.com> 12 * 13 * This work is licensed under the terms of the GNU GPL, version 2 or later. 14 * See the COPYING file in the top-level directory. 15 */ 16 17 #include "qemu/osdep.h" 18 #include "hw/sysbus.h" 19 #include "hw/misc/arm_integrator_debug.h" 20 #include "qemu/log.h" 21 #include "qemu/module.h" 22 23 #define INTEGRATOR_DEBUG(obj) \ 24 OBJECT_CHECK(IntegratorDebugState, (obj), TYPE_INTEGRATOR_DEBUG) 25 26 typedef struct { 27 SysBusDevice parent_obj; 28 29 MemoryRegion iomem; 30 } IntegratorDebugState; 31 32 static uint64_t intdbg_control_read(void *opaque, hwaddr offset, 33 unsigned size) 34 { 35 switch (offset >> 2) { 36 case 0: /* ALPHA */ 37 case 1: /* LEDS */ 38 case 2: /* SWITCHES */ 39 qemu_log_mask(LOG_UNIMP, 40 "%s: returning zero from %" HWADDR_PRIx ":%u\n", 41 __func__, offset, size); 42 return 0; 43 default: 44 qemu_log_mask(LOG_GUEST_ERROR, 45 "%s: Bad offset %" HWADDR_PRIx, 46 __func__, offset); 47 return 0; 48 } 49 } 50 51 static void intdbg_control_write(void *opaque, hwaddr offset, 52 uint64_t value, unsigned size) 53 { 54 switch (offset >> 2) { 55 case 1: /* ALPHA */ 56 case 2: /* LEDS */ 57 case 3: /* SWITCHES */ 58 /* Nothing interesting implemented yet. */ 59 qemu_log_mask(LOG_UNIMP, 60 "%s: ignoring write of %" PRIu64 61 " to %" HWADDR_PRIx ":%u\n", 62 __func__, value, offset, size); 63 break; 64 default: 65 qemu_log_mask(LOG_GUEST_ERROR, 66 "%s: write of %" PRIu64 67 " to bad offset %" HWADDR_PRIx "\n", 68 __func__, value, offset); 69 } 70 } 71 72 static const MemoryRegionOps intdbg_control_ops = { 73 .read = intdbg_control_read, 74 .write = intdbg_control_write, 75 .endianness = DEVICE_NATIVE_ENDIAN, 76 }; 77 78 static void intdbg_control_init(Object *obj) 79 { 80 SysBusDevice *sd = SYS_BUS_DEVICE(obj); 81 IntegratorDebugState *s = INTEGRATOR_DEBUG(obj); 82 83 memory_region_init_io(&s->iomem, obj, &intdbg_control_ops, 84 NULL, "dbg-leds", 0x1000000); 85 sysbus_init_mmio(sd, &s->iomem); 86 } 87 88 static const TypeInfo intdbg_info = { 89 .name = TYPE_INTEGRATOR_DEBUG, 90 .parent = TYPE_SYS_BUS_DEVICE, 91 .instance_size = sizeof(IntegratorDebugState), 92 .instance_init = intdbg_control_init, 93 }; 94 95 static void intdbg_register_types(void) 96 { 97 type_register_static(&intdbg_info); 98 } 99 100 type_init(intdbg_register_types) 101