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/*
* 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 "qemu/log.h"
#include "qemu/module.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)
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