STM32F2xx: Add the ADC device

Add the STM32F2xx ADC device. This device randomly
generates values on each read.

This also includes creating a hw/adc directory.

Signed-off-by: Alistair Francis <alistair@alistair23.me>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 3240e660adaf537f55a63ce06096e844aece8cda.1474742262.git.alistair@alistair23.me
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 307 insertions, 0 deletions

diff --git a/hw/adc/Makefile.objs b/hw/adc/Makefile.objs
new file mode 100644
index 0000000000..3f6dfdedae
--- /dev/null
+++ b/hw/adc/Makefile.objs
@@ -0,0 +1 @@
+obj-$(CONFIG_STM32F2XX_ADC) += stm32f2xx_adc.o
diff --git a/hw/adc/stm32f2xx_adc.c b/hw/adc/stm32f2xx_adc.c
new file mode 100644
index 0000000000..90fe9de299
--- /dev/null
+++ b/hw/adc/stm32f2xx_adc.c
@@ -0,0 +1,306 @@
+/*
+ * STM32F2XX ADC
+ *
+ * Copyright (c) 2014 Alistair Francis <alistair@alistair23.me>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/sysbus.h"
+#include "hw/hw.h"
+#include "qapi/error.h"
+#include "qemu/log.h"
+#include "hw/adc/stm32f2xx_adc.h"
+
+#ifndef STM_ADC_ERR_DEBUG
+#define STM_ADC_ERR_DEBUG 0
+#endif
+
+#define DB_PRINT_L(lvl, fmt, args...) do { \
+    if (STM_ADC_ERR_DEBUG >= lvl) { \
+        qemu_log("%s: " fmt, __func__, ## args); \
+    } \
+} while (0);
+
+#define DB_PRINT(fmt, args...) DB_PRINT_L(1, fmt, ## args)
+
+static void stm32f2xx_adc_reset(DeviceState *dev)
+{
+    STM32F2XXADCState *s = STM32F2XX_ADC(dev);
+
+    s->adc_sr = 0x00000000;
+    s->adc_cr1 = 0x00000000;
+    s->adc_cr2 = 0x00000000;
+    s->adc_smpr1 = 0x00000000;
+    s->adc_smpr2 = 0x00000000;
+    s->adc_jofr[0] = 0x00000000;
+    s->adc_jofr[1] = 0x00000000;
+    s->adc_jofr[2] = 0x00000000;
+    s->adc_jofr[3] = 0x00000000;
+    s->adc_htr = 0x00000FFF;
+    s->adc_ltr = 0x00000000;
+    s->adc_sqr1 = 0x00000000;
+    s->adc_sqr2 = 0x00000000;
+    s->adc_sqr3 = 0x00000000;
+    s->adc_jsqr = 0x00000000;
+    s->adc_jdr[0] = 0x00000000;
+    s->adc_jdr[1] = 0x00000000;
+    s->adc_jdr[2] = 0x00000000;
+    s->adc_jdr[3] = 0x00000000;
+    s->adc_dr = 0x00000000;
+}
+
+static uint32_t stm32f2xx_adc_generate_value(STM32F2XXADCState *s)
+{
+    /* Attempts to fake some ADC values */
+    s->adc_dr = s->adc_dr + 7;
+
+    switch ((s->adc_cr1 & ADC_CR1_RES) >> 24) {
+    case 0:
+        /* 12-bit */
+        s->adc_dr &= 0xFFF;
+        break;
+    case 1:
+        /* 10-bit */
+        s->adc_dr &= 0x3FF;
+        break;
+    case 2:
+        /* 8-bit */
+        s->adc_dr &= 0xFF;
+        break;
+    default:
+        /* 6-bit */
+        s->adc_dr &= 0x3F;
+    }
+
+    if (s->adc_cr2 & ADC_CR2_ALIGN) {
+        return (s->adc_dr << 1) & 0xFFF0;
+    } else {
+        return s->adc_dr;
+    }
+}
+
+static uint64_t stm32f2xx_adc_read(void *opaque, hwaddr addr,
+                                     unsigned int size)
+{
+    STM32F2XXADCState *s = opaque;
+
+    DB_PRINT("Address: 0x%" HWADDR_PRIx "\n", addr);
+
+    if (addr >= ADC_COMMON_ADDRESS) {
+        qemu_log_mask(LOG_UNIMP,
+                      "%s: ADC Common Register Unsupported\n", __func__);
+    }
+
+    switch (addr) {
+    case ADC_SR:
+        return s->adc_sr;
+    case ADC_CR1:
+        return s->adc_cr1;
+    case ADC_CR2:
+        return s->adc_cr2 & 0xFFFFFFF;
+    case ADC_SMPR1:
+        return s->adc_smpr1;
+    case ADC_SMPR2:
+        return s->adc_smpr2;
+    case ADC_JOFR1:
+    case ADC_JOFR2:
+    case ADC_JOFR3:
+    case ADC_JOFR4:
+        qemu_log_mask(LOG_UNIMP, "%s: " \
+                      "Injection ADC is not implemented, the registers are " \
+                      "included for compatibility\n", __func__);
+        return s->adc_jofr[(addr - ADC_JOFR1) / 4];
+    case ADC_HTR:
+        return s->adc_htr;
+    case ADC_LTR:
+        return s->adc_ltr;
+    case ADC_SQR1:
+        return s->adc_sqr1;
+    case ADC_SQR2:
+        return s->adc_sqr2;
+    case ADC_SQR3:
+        return s->adc_sqr3;
+    case ADC_JSQR:
+        qemu_log_mask(LOG_UNIMP, "%s: " \
+                      "Injection ADC is not implemented, the registers are " \
+                      "included for compatibility\n", __func__);
+        return s->adc_jsqr;
+    case ADC_JDR1:
+    case ADC_JDR2:
+    case ADC_JDR3:
+    case ADC_JDR4:
+        qemu_log_mask(LOG_UNIMP, "%s: " \
+                      "Injection ADC is not implemented, the registers are " \
+                      "included for compatibility\n", __func__);
+        return s->adc_jdr[(addr - ADC_JDR1) / 4] -
+               s->adc_jofr[(addr - ADC_JDR1) / 4];
+    case ADC_DR:
+        if ((s->adc_cr2 & ADC_CR2_ADON) && (s->adc_cr2 & ADC_CR2_SWSTART)) {
+            s->adc_cr2 ^= ADC_CR2_SWSTART;
+            return stm32f2xx_adc_generate_value(s);
+        } else {
+            return 0;
+        }
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, addr);
+    }
+
+    return 0;
+}
+
+static void stm32f2xx_adc_write(void *opaque, hwaddr addr,
+                       uint64_t val64, unsigned int size)
+{
+    STM32F2XXADCState *s = opaque;
+    uint32_t value = (uint32_t) val64;
+
+    DB_PRINT("Address: 0x%" HWADDR_PRIx ", Value: 0x%x\n",
+             addr, value);
+
+    if (addr >= 0x100) {
+        qemu_log_mask(LOG_UNIMP,
+                      "%s: ADC Common Register Unsupported\n", __func__);
+    }
+
+    switch (addr) {
+    case ADC_SR:
+        s->adc_sr &= (value & 0x3F);
+        break;
+    case ADC_CR1:
+        s->adc_cr1 = value;
+        break;
+    case ADC_CR2:
+        s->adc_cr2 = value;
+        break;
+    case ADC_SMPR1:
+        s->adc_smpr1 = value;
+        break;
+    case ADC_SMPR2:
+        s->adc_smpr2 = value;
+        break;
+    case ADC_JOFR1:
+    case ADC_JOFR2:
+    case ADC_JOFR3:
+    case ADC_JOFR4:
+        s->adc_jofr[(addr - ADC_JOFR1) / 4] = (value & 0xFFF);
+        qemu_log_mask(LOG_UNIMP, "%s: " \
+                      "Injection ADC is not implemented, the registers are " \
+                      "included for compatibility\n", __func__);
+        break;
+    case ADC_HTR:
+        s->adc_htr = value;
+        break;
+    case ADC_LTR:
+        s->adc_ltr = value;
+        break;
+    case ADC_SQR1:
+        s->adc_sqr1 = value;
+        break;
+    case ADC_SQR2:
+        s->adc_sqr2 = value;
+        break;
+    case ADC_SQR3:
+        s->adc_sqr3 = value;
+        break;
+    case ADC_JSQR:
+        s->adc_jsqr = value;
+        qemu_log_mask(LOG_UNIMP, "%s: " \
+                      "Injection ADC is not implemented, the registers are " \
+                      "included for compatibility\n", __func__);
+        break;
+    case ADC_JDR1:
+    case ADC_JDR2:
+    case ADC_JDR3:
+    case ADC_JDR4:
+        s->adc_jdr[(addr - ADC_JDR1) / 4] = value;
+        qemu_log_mask(LOG_UNIMP, "%s: " \
+                      "Injection ADC is not implemented, the registers are " \
+                      "included for compatibility\n", __func__);
+        break;
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, addr);
+    }
+}
+
+static const MemoryRegionOps stm32f2xx_adc_ops = {
+    .read = stm32f2xx_adc_read,
+    .write = stm32f2xx_adc_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static const VMStateDescription vmstate_stm32f2xx_adc = {
+    .name = TYPE_STM32F2XX_ADC,
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT32(adc_sr, STM32F2XXADCState),
+        VMSTATE_UINT32(adc_cr1, STM32F2XXADCState),
+        VMSTATE_UINT32(adc_cr2, STM32F2XXADCState),
+        VMSTATE_UINT32(adc_smpr1, STM32F2XXADCState),
+        VMSTATE_UINT32(adc_smpr2, STM32F2XXADCState),
+        VMSTATE_UINT32_ARRAY(adc_jofr, STM32F2XXADCState, 4),
+        VMSTATE_UINT32(adc_htr, STM32F2XXADCState),
+        VMSTATE_UINT32(adc_ltr, STM32F2XXADCState),
+        VMSTATE_UINT32(adc_sqr1, STM32F2XXADCState),
+        VMSTATE_UINT32(adc_sqr2, STM32F2XXADCState),
+        VMSTATE_UINT32(adc_sqr3, STM32F2XXADCState),
+        VMSTATE_UINT32(adc_jsqr, STM32F2XXADCState),
+        VMSTATE_UINT32_ARRAY(adc_jdr, STM32F2XXADCState, 4),
+        VMSTATE_UINT32(adc_dr, STM32F2XXADCState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static void stm32f2xx_adc_init(Object *obj)
+{
+    STM32F2XXADCState *s = STM32F2XX_ADC(obj);
+
+    sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq);
+
+    memory_region_init_io(&s->mmio, obj, &stm32f2xx_adc_ops, s,
+                          TYPE_STM32F2XX_ADC, 0xFF);
+    sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
+}
+
+static void stm32f2xx_adc_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->reset = stm32f2xx_adc_reset;
+    dc->vmsd = &vmstate_stm32f2xx_adc;
+}
+
+static const TypeInfo stm32f2xx_adc_info = {
+    .name          = TYPE_STM32F2XX_ADC,
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(STM32F2XXADCState),
+    .instance_init = stm32f2xx_adc_init,
+    .class_init    = stm32f2xx_adc_class_init,
+};
+
+static void stm32f2xx_adc_register_types(void)
+{
+    type_register_static(&stm32f2xx_adc_info);
+}
+
+type_init(stm32f2xx_adc_register_types)