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1 /*
2 * STM32F405 SPI
3 *
4 * Copyright (c) 2014 Alistair Francis <alistair@alistair23.me>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25 #include "qemu/osdep.h"
26 #include "qemu/log.h"
27 #include "qemu/module.h"
28 #include "hw/ssi/stm32f2xx_spi.h"
29 #include "migration/vmstate.h"
30
31 #ifndef STM_SPI_ERR_DEBUG
32 #define STM_SPI_ERR_DEBUG 0
33 #endif
34
35 #define DB_PRINT_L(lvl, fmt, args...) do { \
36 if (STM_SPI_ERR_DEBUG >= lvl) { \
37 qemu_log("%s: " fmt, __func__, ## args); \
38 } \
39 } while (0)
40
41 #define DB_PRINT(fmt, args...) DB_PRINT_L(1, fmt, ## args)
42
43 static void stm32f2xx_spi_reset(DeviceState *dev)
44 {
45 STM32F2XXSPIState *s = STM32F2XX_SPI(dev);
46
47 s->spi_cr1 = 0x00000000;
48 s->spi_cr2 = 0x00000000;
49 s->spi_sr = 0x0000000A;
50 s->spi_dr = 0x0000000C;
51 s->spi_crcpr = 0x00000007;
52 s->spi_rxcrcr = 0x00000000;
53 s->spi_txcrcr = 0x00000000;
54 s->spi_i2scfgr = 0x00000000;
55 s->spi_i2spr = 0x00000002;
56 }
57
58 static void stm32f2xx_spi_transfer(STM32F2XXSPIState *s)
59 {
60 DB_PRINT("Data to send: 0x%x\n", s->spi_dr);
61
62 s->spi_dr = ssi_transfer(s->ssi, s->spi_dr);
63 s->spi_sr |= STM_SPI_SR_RXNE;
64
65 DB_PRINT("Data received: 0x%x\n", s->spi_dr);
66 }
67
68 static uint64_t stm32f2xx_spi_read(void *opaque, hwaddr addr,
69 unsigned int size)
70 {
71 STM32F2XXSPIState *s = opaque;
72
73 DB_PRINT("Address: 0x%" HWADDR_PRIx "\n", addr);
74
75 switch (addr) {
76 case STM_SPI_CR1:
77 return s->spi_cr1;
78 case STM_SPI_CR2:
79 qemu_log_mask(LOG_UNIMP, "%s: Interrupts and DMA are not implemented\n",
80 __func__);
81 return s->spi_cr2;
82 case STM_SPI_SR:
83 return s->spi_sr;
84 case STM_SPI_DR:
85 stm32f2xx_spi_transfer(s);
86 s->spi_sr &= ~STM_SPI_SR_RXNE;
87 return s->spi_dr;
88 case STM_SPI_CRCPR:
89 qemu_log_mask(LOG_UNIMP, "%s: CRC is not implemented, the registers " \
90 "are included for compatibility\n", __func__);
91 return s->spi_crcpr;
92 case STM_SPI_RXCRCR:
93 qemu_log_mask(LOG_UNIMP, "%s: CRC is not implemented, the registers " \
94 "are included for compatibility\n", __func__);
95 return s->spi_rxcrcr;
96 case STM_SPI_TXCRCR:
97 qemu_log_mask(LOG_UNIMP, "%s: CRC is not implemented, the registers " \
98 "are included for compatibility\n", __func__);
99 return s->spi_txcrcr;
100 case STM_SPI_I2SCFGR:
101 qemu_log_mask(LOG_UNIMP, "%s: I2S is not implemented, the registers " \
102 "are included for compatibility\n", __func__);
103 return s->spi_i2scfgr;
104 case STM_SPI_I2SPR:
105 qemu_log_mask(LOG_UNIMP, "%s: I2S is not implemented, the registers " \
106 "are included for compatibility\n", __func__);
107 return s->spi_i2spr;
108 default:
109 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIx "\n",
110 __func__, addr);
111 }
112
113 return 0;
114 }
115
116 static void stm32f2xx_spi_write(void *opaque, hwaddr addr,
117 uint64_t val64, unsigned int size)
118 {
119 STM32F2XXSPIState *s = opaque;
120 uint32_t value = val64;
121
122 DB_PRINT("Address: 0x%" HWADDR_PRIx ", Value: 0x%x\n", addr, value);
123
124 switch (addr) {
125 case STM_SPI_CR1:
126 s->spi_cr1 = value;
127 return;
128 case STM_SPI_CR2:
129 qemu_log_mask(LOG_UNIMP, "%s: " \
130 "Interrupts and DMA are not implemented\n", __func__);
131 s->spi_cr2 = value;
132 return;
133 case STM_SPI_SR:
134 /* Read only register, except for clearing the CRCERR bit, which
135 * is not supported
136 */
137 return;
138 case STM_SPI_DR:
139 s->spi_dr = value;
140 stm32f2xx_spi_transfer(s);
141 return;
142 case STM_SPI_CRCPR:
143 qemu_log_mask(LOG_UNIMP, "%s: CRC is not implemented\n", __func__);
144 return;
145 case STM_SPI_RXCRCR:
146 qemu_log_mask(LOG_GUEST_ERROR, "%s: Read only register: " \
147 "0x%" HWADDR_PRIx "\n", __func__, addr);
148 return;
149 case STM_SPI_TXCRCR:
150 qemu_log_mask(LOG_GUEST_ERROR, "%s: Read only register: " \
151 "0x%" HWADDR_PRIx "\n", __func__, addr);
152 return;
153 case STM_SPI_I2SCFGR:
154 qemu_log_mask(LOG_UNIMP, "%s: " \
155 "I2S is not implemented\n", __func__);
156 return;
157 case STM_SPI_I2SPR:
158 qemu_log_mask(LOG_UNIMP, "%s: " \
159 "I2S is not implemented\n", __func__);
160 return;
161 default:
162 qemu_log_mask(LOG_GUEST_ERROR,
163 "%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, addr);
164 }
165 }
166
167 static const MemoryRegionOps stm32f2xx_spi_ops = {
168 .read = stm32f2xx_spi_read,
169 .write = stm32f2xx_spi_write,
170 .endianness = DEVICE_NATIVE_ENDIAN,
171 };
172
173 static const VMStateDescription vmstate_stm32f2xx_spi = {
174 .name = TYPE_STM32F2XX_SPI,
175 .version_id = 1,
176 .minimum_version_id = 1,
177 .fields = (const VMStateField[]) {
178 VMSTATE_UINT32(spi_cr1, STM32F2XXSPIState),
179 VMSTATE_UINT32(spi_cr2, STM32F2XXSPIState),
180 VMSTATE_UINT32(spi_sr, STM32F2XXSPIState),
181 VMSTATE_UINT32(spi_dr, STM32F2XXSPIState),
182 VMSTATE_UINT32(spi_crcpr, STM32F2XXSPIState),
183 VMSTATE_UINT32(spi_rxcrcr, STM32F2XXSPIState),
184 VMSTATE_UINT32(spi_txcrcr, STM32F2XXSPIState),
185 VMSTATE_UINT32(spi_i2scfgr, STM32F2XXSPIState),
186 VMSTATE_UINT32(spi_i2spr, STM32F2XXSPIState),
187 VMSTATE_END_OF_LIST()
188 }
189 };
190
191 static void stm32f2xx_spi_init(Object *obj)
192 {
193 STM32F2XXSPIState *s = STM32F2XX_SPI(obj);
194 DeviceState *dev = DEVICE(obj);
195
196 memory_region_init_io(&s->mmio, obj, &stm32f2xx_spi_ops, s,
197 TYPE_STM32F2XX_SPI, 0x400);
198 sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
199
200 sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq);
201
202 s->ssi = ssi_create_bus(dev, "ssi");
203 }
204
205 static void stm32f2xx_spi_class_init(ObjectClass *klass, const void *data)
206 {
207 DeviceClass *dc = DEVICE_CLASS(klass);
208
209 device_class_set_legacy_reset(dc, stm32f2xx_spi_reset);
210 dc->vmsd = &vmstate_stm32f2xx_spi;
211 }
212
213 static const TypeInfo stm32f2xx_spi_info = {
214 .name = TYPE_STM32F2XX_SPI,
215 .parent = TYPE_SYS_BUS_DEVICE,
216 .instance_size = sizeof(STM32F2XXSPIState),
217 .instance_init = stm32f2xx_spi_init,
218 .class_init = stm32f2xx_spi_class_init,
219 };
220
221 static void stm32f2xx_spi_register_types(void)
222 {
223 type_register_static(&stm32f2xx_spi_info);
224 }
225
226 type_init(stm32f2xx_spi_register_types)