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1 /*
2 * Nordic Semiconductor nRF51 SoC
3 * http://infocenter.nordicsemi.com/pdf/nRF51_RM_v3.0.1.pdf
4 *
5 * Copyright 2018 Joel Stanley <joel@jms.id.au>
6 *
7 * This code is licensed under the GPL version 2 or later. See
8 * the COPYING file in the top-level directory.
9 */
10
11 #include "qemu/osdep.h"
12 #include "qapi/error.h"
13 #include "hw/arm/boot.h"
14 #include "hw/core/sysbus.h"
15 #include "hw/core/qdev-clock.h"
16 #include "hw/misc/unimp.h"
17 #include "qemu/log.h"
18
19 #include "hw/arm/nrf51.h"
20 #include "hw/arm/nrf51_soc.h"
21
22 /*
23 * The size and base is for the NRF51822 part. If other parts
24 * are supported in the future, add a sub-class of NRF51SoC for
25 * the specific variants
26 */
27 #define NRF51822_FLASH_PAGES 256
28 #define NRF51822_SRAM_PAGES 16
29 #define NRF51822_FLASH_SIZE (NRF51822_FLASH_PAGES * NRF51_PAGE_SIZE)
30 #define NRF51822_SRAM_SIZE (NRF51822_SRAM_PAGES * NRF51_PAGE_SIZE)
31
32 #define BASE_TO_IRQ(base) ((base >> 12) & 0x1F)
33
34 /* HCLK (the main CPU clock) on this SoC is always 16MHz */
35 #define HCLK_FRQ 16000000
36
37 static uint64_t clock_read(void *opaque, hwaddr addr, unsigned int size)
38 {
39 qemu_log_mask(LOG_UNIMP, "%s: 0x%" HWADDR_PRIx " [%u]\n",
40 __func__, addr, size);
41 return 1;
42 }
43
44 static void clock_write(void *opaque, hwaddr addr, uint64_t data,
45 unsigned int size)
46 {
47 qemu_log_mask(LOG_UNIMP, "%s: 0x%" HWADDR_PRIx " <- 0x%" PRIx64 " [%u]\n",
48 __func__, addr, data, size);
49 }
50
51 static const MemoryRegionOps clock_ops = {
52 .read = clock_read,
53 .write = clock_write
54 };
55
56
57 static void nrf51_soc_realize(DeviceState *dev_soc, Error **errp)
58 {
59 NRF51State *s = NRF51_SOC(dev_soc);
60 MemoryRegion *mr;
61 uint8_t i = 0;
62 hwaddr base_addr = 0;
63
64 if (!s->board_memory) {
65 error_setg(errp, "memory property was not set");
66 return;
67 }
68
69 /*
70 * HCLK on this SoC is fixed, so we set up sysclk ourselves and
71 * the board shouldn't connect it.
72 */
73 if (clock_has_source(s->sysclk)) {
74 error_setg(errp, "sysclk clock must not be wired up by the board code");
75 return;
76 }
77 /* This clock doesn't need migration because it is fixed-frequency */
78 clock_set_hz(s->sysclk, HCLK_FRQ);
79 qdev_connect_clock_in(DEVICE(&s->armv7m), "cpuclk", s->sysclk);
80 /*
81 * This SoC has no systick device, so don't connect refclk.
82 * TODO: model the lack of systick (currently the armv7m object
83 * will always provide one).
84 */
85
86 object_property_set_link(OBJECT(&s->armv7m), "memory", OBJECT(&s->container),
87 &error_abort);
88 if (!sysbus_realize(SYS_BUS_DEVICE(&s->armv7m), errp)) {
89 return;
90 }
91
92 memory_region_add_subregion_overlap(&s->container, 0, s->board_memory, -1);
93
94 if (!memory_region_init_ram(&s->sram, OBJECT(s), "nrf51.sram", s->sram_size,
95 errp)) {
96 return;
97 }
98 memory_region_add_subregion(&s->container, NRF51_SRAM_BASE, &s->sram);
99
100 /* UART */
101 if (!sysbus_realize(SYS_BUS_DEVICE(&s->uart), errp)) {
102 return;
103 }
104 mr = sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->uart), 0);
105 memory_region_add_subregion_overlap(&s->container, NRF51_UART_BASE, mr, 0);
106 sysbus_connect_irq(SYS_BUS_DEVICE(&s->uart), 0,
107 qdev_get_gpio_in(DEVICE(&s->armv7m),
108 BASE_TO_IRQ(NRF51_UART_BASE)));
109
110 /* RNG */
111 if (!sysbus_realize(SYS_BUS_DEVICE(&s->rng), errp)) {
112 return;
113 }
114
115 mr = sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->rng), 0);
116 memory_region_add_subregion_overlap(&s->container, NRF51_RNG_BASE, mr, 0);
117 sysbus_connect_irq(SYS_BUS_DEVICE(&s->rng), 0,
118 qdev_get_gpio_in(DEVICE(&s->armv7m),
119 BASE_TO_IRQ(NRF51_RNG_BASE)));
120
121 /* UICR, FICR, NVMC, FLASH */
122 if (!object_property_set_uint(OBJECT(&s->nvm), "flash-size",
123 s->flash_size, errp)) {
124 return;
125 }
126
127 if (!sysbus_realize(SYS_BUS_DEVICE(&s->nvm), errp)) {
128 return;
129 }
130
131 mr = sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->nvm), 0);
132 memory_region_add_subregion_overlap(&s->container, NRF51_NVMC_BASE, mr, 0);
133 mr = sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->nvm), 1);
134 memory_region_add_subregion_overlap(&s->container, NRF51_FICR_BASE, mr, 0);
135 mr = sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->nvm), 2);
136 memory_region_add_subregion_overlap(&s->container, NRF51_UICR_BASE, mr, 0);
137 mr = sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->nvm), 3);
138 memory_region_add_subregion_overlap(&s->container, NRF51_FLASH_BASE, mr, 0);
139
140 /* GPIO */
141 if (!sysbus_realize(SYS_BUS_DEVICE(&s->gpio), errp)) {
142 return;
143 }
144
145 mr = sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->gpio), 0);
146 memory_region_add_subregion_overlap(&s->container, NRF51_GPIO_BASE, mr, 0);
147
148 /* Pass all GPIOs to the SOC layer so they are available to the board */
149 qdev_pass_gpios(DEVICE(&s->gpio), dev_soc, NULL);
150
151 /* TIMER */
152 for (i = 0; i < NRF51_NUM_TIMERS; i++) {
153 if (!object_property_set_uint(OBJECT(&s->timer[i]), "id", i, errp)) {
154 return;
155 }
156 if (!sysbus_realize(SYS_BUS_DEVICE(&s->timer[i]), errp)) {
157 return;
158 }
159
160 base_addr = NRF51_TIMER_BASE + i * NRF51_PERIPHERAL_SIZE;
161
162 sysbus_mmio_map(SYS_BUS_DEVICE(&s->timer[i]), 0, base_addr);
163 sysbus_connect_irq(SYS_BUS_DEVICE(&s->timer[i]), 0,
164 qdev_get_gpio_in(DEVICE(&s->armv7m),
165 BASE_TO_IRQ(base_addr)));
166 }
167
168 /* STUB Peripherals */
169 memory_region_init_io(&s->clock, OBJECT(dev_soc), &clock_ops, NULL,
170 "nrf51_soc.clock", NRF51_PERIPHERAL_SIZE);
171 memory_region_add_subregion_overlap(&s->container,
172 NRF51_IOMEM_BASE, &s->clock, -1);
173
174 create_unimplemented_device("nrf51_soc.io", NRF51_IOMEM_BASE,
175 NRF51_IOMEM_SIZE);
176 create_unimplemented_device("nrf51_soc.private",
177 NRF51_PRIVATE_BASE, NRF51_PRIVATE_SIZE);
178 }
179
180 static void nrf51_soc_init(Object *obj)
181 {
182 uint8_t i = 0;
183
184 NRF51State *s = NRF51_SOC(obj);
185
186 memory_region_init(&s->container, obj, "nrf51-container", UINT64_MAX);
187
188 object_initialize_child(OBJECT(s), "armv6m", &s->armv7m, TYPE_ARMV7M);
189 qdev_prop_set_string(DEVICE(&s->armv7m), "cpu-type",
190 ARM_CPU_TYPE_NAME("cortex-m0"));
191 qdev_prop_set_uint32(DEVICE(&s->armv7m), "num-irq", 32);
192
193 object_initialize_child(obj, "uart", &s->uart, TYPE_NRF51_UART);
194 object_property_add_alias(obj, "serial0", OBJECT(&s->uart), "chardev");
195
196 object_initialize_child(obj, "rng", &s->rng, TYPE_NRF51_RNG);
197
198 object_initialize_child(obj, "nvm", &s->nvm, TYPE_NRF51_NVM);
199
200 object_initialize_child(obj, "gpio", &s->gpio, TYPE_NRF51_GPIO);
201
202 for (i = 0; i < NRF51_NUM_TIMERS; i++) {
203 object_initialize_child(obj, "timer[*]", &s->timer[i],
204 TYPE_NRF51_TIMER);
205
206 }
207
208 s->sysclk = qdev_init_clock_in(DEVICE(s), "sysclk", NULL, NULL, 0);
209 }
210
211 static const Property nrf51_soc_properties[] = {
212 DEFINE_PROP_LINK("memory", NRF51State, board_memory, TYPE_MEMORY_REGION,
213 MemoryRegion *),
214 DEFINE_PROP_UINT32("sram-size", NRF51State, sram_size, NRF51822_SRAM_SIZE),
215 DEFINE_PROP_UINT32("flash-size", NRF51State, flash_size,
216 NRF51822_FLASH_SIZE),
217 };
218
219 static void nrf51_soc_class_init(ObjectClass *klass, const void *data)
220 {
221 DeviceClass *dc = DEVICE_CLASS(klass);
222
223 dc->realize = nrf51_soc_realize;
224 device_class_set_props(dc, nrf51_soc_properties);
225 }
226
227 static const TypeInfo nrf51_soc_info = {
228 .name = TYPE_NRF51_SOC,
229 .parent = TYPE_SYS_BUS_DEVICE,
230 .instance_size = sizeof(NRF51State),
231 .instance_init = nrf51_soc_init,
232 .class_init = nrf51_soc_class_init,
233 };
234
235 static void nrf51_soc_types(void)
236 {
237 type_register_static(&nrf51_soc_info);
238 }
239 type_init(nrf51_soc_types)