xref: /openbmc/qemu/hw/arm/nrf51_soc.c (revision 2f95279a)
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/sysbus.h"
15 #include "hw/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->cpu), "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->cpu), "memory", OBJECT(&s->container),
87                              &error_abort);
88     if (!sysbus_realize(SYS_BUS_DEVICE(&s->cpu), 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->cpu),
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->cpu),
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->cpu),
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->cpu, TYPE_ARMV7M);
189     qdev_prop_set_string(DEVICE(&s->cpu), "cpu-type",
190                          ARM_CPU_TYPE_NAME("cortex-m0"));
191     qdev_prop_set_uint32(DEVICE(&s->cpu), "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 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     DEFINE_PROP_END_OF_LIST(),
218 };
219 
220 static void nrf51_soc_class_init(ObjectClass *klass, void *data)
221 {
222     DeviceClass *dc = DEVICE_CLASS(klass);
223 
224     dc->realize = nrf51_soc_realize;
225     device_class_set_props(dc, nrf51_soc_properties);
226 }
227 
228 static const TypeInfo nrf51_soc_info = {
229     .name          = TYPE_NRF51_SOC,
230     .parent        = TYPE_SYS_BUS_DEVICE,
231     .instance_size = sizeof(NRF51State),
232     .instance_init = nrf51_soc_init,
233     .class_init    = nrf51_soc_class_init,
234 };
235 
236 static void nrf51_soc_types(void)
237 {
238     type_register_static(&nrf51_soc_info);
239 }
240 type_init(nrf51_soc_types)
241