STM32F2xx: Add the SPI device

Add the STM32F2xx SPI device.

Signed-off-by: Alistair Francis <alistair@alistair23.me>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 8197811d5c94f814fa67c6a33ca2f7fd0aa97432.1474742262.git.alistair@alistair23.me
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 226 insertions, 0 deletions

diff --git a/hw/ssi/Makefile.objs b/hw/ssi/Makefile.objs
index c79a8dc..487add2 100644
--- a/hw/ssi/Makefile.objs
+++ b/hw/ssi/Makefile.objs
@@ -3,6 +3,7 @@ common-obj-$(CONFIG_SSI) += ssi.o
 common-obj-$(CONFIG_XILINX_SPI) += xilinx_spi.o
 common-obj-$(CONFIG_XILINX_SPIPS) += xilinx_spips.o
 common-obj-$(CONFIG_ASPEED_SOC) += aspeed_smc.o
+common-obj-$(CONFIG_STM32F2XX_SPI) += stm32f2xx_spi.o
 
 obj-$(CONFIG_OMAP) += omap_spi.o
 obj-$(CONFIG_IMX) += imx_spi.o
diff --git a/hw/ssi/stm32f2xx_spi.c b/hw/ssi/stm32f2xx_spi.c
new file mode 100644
index 0000000..26a1b4d
--- /dev/null
+++ b/hw/ssi/stm32f2xx_spi.c
@@ -0,0 +1,225 @@
+/*
+ * STM32F405 SPI
+ *
+ * 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 "qapi/error.h"
+#include "qemu/log.h"
+#include "hw/ssi/stm32f2xx_spi.h"
+
+#ifndef STM_SPI_ERR_DEBUG
+#define STM_SPI_ERR_DEBUG 0
+#endif
+
+#define DB_PRINT_L(lvl, fmt, args...) do { \
+    if (STM_SPI_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_spi_reset(DeviceState *dev)
+{
+    STM32F2XXSPIState *s = STM32F2XX_SPI(dev);
+
+    s->spi_cr1 = 0x00000000;
+    s->spi_cr2 = 0x00000000;
+    s->spi_sr = 0x0000000A;
+    s->spi_dr = 0x0000000C;
+    s->spi_crcpr = 0x00000007;
+    s->spi_rxcrcr = 0x00000000;
+    s->spi_txcrcr = 0x00000000;
+    s->spi_i2scfgr = 0x00000000;
+    s->spi_i2spr = 0x00000002;
+}
+
+static void stm32f2xx_spi_transfer(STM32F2XXSPIState *s)
+{
+    DB_PRINT("Data to send: 0x%x\n", s->spi_dr);
+
+    s->spi_dr = ssi_transfer(s->ssi, s->spi_dr);
+    s->spi_sr |= STM_SPI_SR_RXNE;
+
+    DB_PRINT("Data received: 0x%x\n", s->spi_dr);
+}
+
+static uint64_t stm32f2xx_spi_read(void *opaque, hwaddr addr,
+                                     unsigned int size)
+{
+    STM32F2XXSPIState *s = opaque;
+
+    DB_PRINT("Address: 0x%" HWADDR_PRIx "\n", addr);
+
+    switch (addr) {
+    case STM_SPI_CR1:
+        return s->spi_cr1;
+    case STM_SPI_CR2:
+        qemu_log_mask(LOG_UNIMP, "%s: Interrupts and DMA are not implemented\n",
+                      __func__);
+        return s->spi_cr2;
+    case STM_SPI_SR:
+        return s->spi_sr;
+    case STM_SPI_DR:
+        stm32f2xx_spi_transfer(s);
+        s->spi_sr &= ~STM_SPI_SR_RXNE;
+        return s->spi_dr;
+    case STM_SPI_CRCPR:
+        qemu_log_mask(LOG_UNIMP, "%s: CRC is not implemented, the registers " \
+                      "are included for compatibility\n", __func__);
+        return s->spi_crcpr;
+    case STM_SPI_RXCRCR:
+        qemu_log_mask(LOG_UNIMP, "%s: CRC is not implemented, the registers " \
+                      "are included for compatibility\n", __func__);
+        return s->spi_rxcrcr;
+    case STM_SPI_TXCRCR:
+        qemu_log_mask(LOG_UNIMP, "%s: CRC is not implemented, the registers " \
+                      "are included for compatibility\n", __func__);
+        return s->spi_txcrcr;
+    case STM_SPI_I2SCFGR:
+        qemu_log_mask(LOG_UNIMP, "%s: I2S is not implemented, the registers " \
+                      "are included for compatibility\n", __func__);
+        return s->spi_i2scfgr;
+    case STM_SPI_I2SPR:
+        qemu_log_mask(LOG_UNIMP, "%s: I2S is not implemented, the registers " \
+                      "are included for compatibility\n", __func__);
+        return s->spi_i2spr;
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIx "\n",
+                      __func__, addr);
+    }
+
+    return 0;
+}
+
+static void stm32f2xx_spi_write(void *opaque, hwaddr addr,
+                                uint64_t val64, unsigned int size)
+{
+    STM32F2XXSPIState *s = opaque;
+    uint32_t value = val64;
+
+    DB_PRINT("Address: 0x%" HWADDR_PRIx ", Value: 0x%x\n", addr, value);
+
+    switch (addr) {
+    case STM_SPI_CR1:
+        s->spi_cr1 = value;
+        return;
+    case STM_SPI_CR2:
+        qemu_log_mask(LOG_UNIMP, "%s: " \
+                      "Interrupts and DMA are not implemented\n", __func__);
+        s->spi_cr2 = value;
+        return;
+    case STM_SPI_SR:
+        /* Read only register, except for clearing the CRCERR bit, which
+         * is not supported
+         */
+        return;
+    case STM_SPI_DR:
+        s->spi_dr = value;
+        stm32f2xx_spi_transfer(s);
+        return;
+    case STM_SPI_CRCPR:
+        qemu_log_mask(LOG_UNIMP, "%s: CRC is not implemented\n", __func__);
+        return;
+    case STM_SPI_RXCRCR:
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: Read only register: " \
+                      "0x%" HWADDR_PRIx "\n", __func__, addr);
+        return;
+    case STM_SPI_TXCRCR:
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: Read only register: " \
+                      "0x%" HWADDR_PRIx "\n", __func__, addr);
+        return;
+    case STM_SPI_I2SCFGR:
+        qemu_log_mask(LOG_UNIMP, "%s: " \
+                      "I2S is not implemented\n", __func__);
+        return;
+    case STM_SPI_I2SPR:
+        qemu_log_mask(LOG_UNIMP, "%s: " \
+                      "I2S is not implemented\n", __func__);
+        return;
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, addr);
+    }
+}
+
+static const MemoryRegionOps stm32f2xx_spi_ops = {
+    .read = stm32f2xx_spi_read,
+    .write = stm32f2xx_spi_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static const VMStateDescription vmstate_stm32f2xx_spi = {
+    .name = TYPE_STM32F2XX_SPI,
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT32(spi_cr1, STM32F2XXSPIState),
+        VMSTATE_UINT32(spi_cr2, STM32F2XXSPIState),
+        VMSTATE_UINT32(spi_sr, STM32F2XXSPIState),
+        VMSTATE_UINT32(spi_dr, STM32F2XXSPIState),
+        VMSTATE_UINT32(spi_crcpr, STM32F2XXSPIState),
+        VMSTATE_UINT32(spi_rxcrcr, STM32F2XXSPIState),
+        VMSTATE_UINT32(spi_txcrcr, STM32F2XXSPIState),
+        VMSTATE_UINT32(spi_i2scfgr, STM32F2XXSPIState),
+        VMSTATE_UINT32(spi_i2spr, STM32F2XXSPIState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static void stm32f2xx_spi_init(Object *obj)
+{
+    STM32F2XXSPIState *s = STM32F2XX_SPI(obj);
+    DeviceState *dev = DEVICE(obj);
+
+    memory_region_init_io(&s->mmio, obj, &stm32f2xx_spi_ops, s,
+                          TYPE_STM32F2XX_SPI, 0x400);
+    sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
+
+    sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq);
+
+    s->ssi = ssi_create_bus(dev, "ssi");
+}
+
+static void stm32f2xx_spi_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->reset = stm32f2xx_spi_reset;
+    dc->vmsd = &vmstate_stm32f2xx_spi;
+}
+
+static const TypeInfo stm32f2xx_spi_info = {
+    .name          = TYPE_STM32F2XX_SPI,
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(STM32F2XXSPIState),
+    .instance_init = stm32f2xx_spi_init,
+    .class_init    = stm32f2xx_spi_class_init,
+};
+
+static void stm32f2xx_spi_register_types(void)
+{
+    type_register_static(&stm32f2xx_spi_info);
+}
+
+type_init(stm32f2xx_spi_register_types)