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 "hw/hw.h" 18 #include "hw/sysbus.h" 19 #include "exec/address-spaces.h" 20 #include "hw/misc/arm_integrator_debug.h" 21 22 #define INTEGRATOR_DEBUG(obj) \ 23 OBJECT_CHECK(IntegratorDebugState, (obj), TYPE_INTEGRATOR_DEBUG) 24 25 typedef struct { 26 SysBusDevice parent_obj; 27 28 MemoryRegion iomem; 29 } IntegratorDebugState; 30 31 static uint64_t intdbg_control_read(void *opaque, hwaddr offset, 32 unsigned size) 33 { 34 switch (offset >> 2) { 35 case 0: /* ALPHA */ 36 case 1: /* LEDS */ 37 case 2: /* SWITCHES */ 38 qemu_log_mask(LOG_UNIMP, 39 "%s: returning zero from %" HWADDR_PRIx ":%u\n", 40 __func__, offset, size); 41 return 0; 42 default: 43 qemu_log_mask(LOG_GUEST_ERROR, 44 "%s: Bad offset %" HWADDR_PRIx, 45 __func__, offset); 46 return 0; 47 } 48 } 49 50 static void intdbg_control_write(void *opaque, hwaddr offset, 51 uint64_t value, unsigned size) 52 { 53 switch (offset >> 2) { 54 case 1: /* ALPHA */ 55 case 2: /* LEDS */ 56 case 3: /* SWITCHES */ 57 /* Nothing interesting implemented yet. */ 58 qemu_log_mask(LOG_UNIMP, 59 "%s: ignoring write of %" PRIu64 60 " to %" HWADDR_PRIx ":%u\n", 61 __func__, value, offset, size); 62 break; 63 default: 64 qemu_log_mask(LOG_GUEST_ERROR, 65 "%s: write of %" PRIu64 66 " to bad offset %" HWADDR_PRIx "\n", 67 __func__, value, offset); 68 } 69 } 70 71 static const MemoryRegionOps intdbg_control_ops = { 72 .read = intdbg_control_read, 73 .write = intdbg_control_write, 74 .endianness = DEVICE_NATIVE_ENDIAN, 75 }; 76 77 static void intdbg_control_init(Object *obj) 78 { 79 SysBusDevice *sd = SYS_BUS_DEVICE(obj); 80 IntegratorDebugState *s = INTEGRATOR_DEBUG(obj); 81 82 memory_region_init_io(&s->iomem, NULL, &intdbg_control_ops, 83 NULL, "dbg-leds", 0x1000000); 84 sysbus_init_mmio(sd, &s->iomem); 85 } 86 87 static const TypeInfo intdbg_info = { 88 .name = TYPE_INTEGRATOR_DEBUG, 89 .parent = TYPE_SYS_BUS_DEVICE, 90 .instance_size = sizeof(IntegratorDebugState), 91 .instance_init = intdbg_control_init, 92 }; 93 94 static void intdbg_register_types(void) 95 { 96 type_register_static(&intdbg_info); 97 } 98 99 type_init(intdbg_register_types) 100