Add code to emulate Xilinx Slave Serial FPGA configuration port. Cc: "Edgar E. Iglesias" <edgar.igles...@gmail.com> Cc: Alistair Francis <alistair.fran...@xilinx.com> Cc: qemu-devel@nongnu.org Cc: qemu-...@nongnu.org Cc: yurov...@gmail.com Signed-off-by: Andrey Smirnov <andrew.smir...@gmail.com> ---
Integrating this into a build system via "obj-y" might not be the best way. Does this code need a dedicated CONFIG_ symbol? Thanks, Andrey Smirnov hw/misc/Makefile.objs | 1 + hw/misc/xilinx_slave_serial.c | 105 ++++++++++++++++++++++++++++++++++ include/hw/misc/xilinx_slave_serial.h | 21 +++++++ 3 files changed, 127 insertions(+) create mode 100644 hw/misc/xilinx_slave_serial.c create mode 100644 include/hw/misc/xilinx_slave_serial.h diff --git a/hw/misc/Makefile.objs b/hw/misc/Makefile.objs index a68a201083..4599288e55 100644 --- a/hw/misc/Makefile.objs +++ b/hw/misc/Makefile.objs @@ -38,6 +38,7 @@ obj-$(CONFIG_IMX) += imx7_ccm.o obj-$(CONFIG_IMX) += imx2_wdt.o obj-$(CONFIG_IMX) += imx7_snvs.o obj-$(CONFIG_IMX) += imx7_gpr.o +obj-y += xilinx_slave_serial.o obj-$(CONFIG_MILKYMIST) += milkymist-hpdmc.o obj-$(CONFIG_MILKYMIST) += milkymist-pfpu.o obj-$(CONFIG_MAINSTONE) += mst_fpga.o diff --git a/hw/misc/xilinx_slave_serial.c b/hw/misc/xilinx_slave_serial.c new file mode 100644 index 0000000000..607674fb60 --- /dev/null +++ b/hw/misc/xilinx_slave_serial.c @@ -0,0 +1,105 @@ +/* + * Copyright (c) 2017, Impinj, Inc. + * + * Code to emulate programming "port" of Xilinx FPGA in Slave Serial + * configuration connected via SPI, for more deatils see (p. 27): + * + * See https://www.xilinx.com/support/documentation/user_guides/ug380.pdf + * + * Author: Andrey Smirnov <andrew.smir...@gmail.com> + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" +#include "hw/misc/xilinx_slave_serial.h" +#include "qemu/log.h" + +enum { + XILINX_SLAVE_SERIAL_STATE_RESET, + XILINX_SLAVE_SERIAL_STATE_RECONFIGURATION, + XILINX_SLAVE_SERIAL_STATE_DONE, +}; + +static void xilinx_slave_serial_update_outputs(XilinxSlaveSerialState *xlnxss) +{ + qemu_set_irq(xlnxss->done, + xlnxss->state == XILINX_SLAVE_SERIAL_STATE_DONE); +} + +static void xilinx_slave_serial_reset(DeviceState *dev) +{ + XilinxSlaveSerialState *xlnxss = XILINX_SLAVE_SERIAL(dev); + + xlnxss->state = XILINX_SLAVE_SERIAL_STATE_RESET; + + xilinx_slave_serial_update_outputs(xlnxss); +} + +static void xilinx_slave_serial_prog_b(void *opaque, int n, int level) +{ + XilinxSlaveSerialState *xlnxss = XILINX_SLAVE_SERIAL(opaque); + assert(n == 0); + + if (level) { + xlnxss->state = XILINX_SLAVE_SERIAL_STATE_RECONFIGURATION; + } + + xilinx_slave_serial_update_outputs(xlnxss); +} + +static void xilinx_slave_serial_realize(SSISlave *ss, Error **errp) +{ + DeviceState *dev = DEVICE(ss); + XilinxSlaveSerialState *xlnxss = XILINX_SLAVE_SERIAL(ss); + + qdev_init_gpio_in_named(dev, + xilinx_slave_serial_prog_b, + XILINX_SLAVE_SERIAL_GPIO_PROG_B, + 1); + qdev_init_gpio_out_named(dev, &xlnxss->done, + XILINX_SLAVE_SERIAL_GPIO_DONE, 1); +} + +static uint32_t xilinx_slave_serial_transfer(SSISlave *ss, uint32_t tx) +{ + XilinxSlaveSerialState *xlnxss = XILINX_SLAVE_SERIAL(ss); + + if (xlnxss->state == XILINX_SLAVE_SERIAL_STATE_RECONFIGURATION) { + xlnxss->state = XILINX_SLAVE_SERIAL_STATE_DONE; + } + + xilinx_slave_serial_update_outputs(xlnxss); + return 0; +} + +static void xilinx_slave_serial_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + SSISlaveClass *k = SSI_SLAVE_CLASS(klass); + + dc->reset = xilinx_slave_serial_reset; + dc->desc = "Xilinx Slave Serial"; + k->realize = xilinx_slave_serial_realize; + k->transfer = xilinx_slave_serial_transfer; + /* + * Slave Serial configuration is not technically SPI and there's + * no CS signal + */ + k->set_cs = NULL; + k->cs_polarity = SSI_CS_NONE; +} + +static const TypeInfo xilinx_slave_serial_info = { + .name = TYPE_XILINX_SLAVE_SERIAL, + .parent = TYPE_SSI_SLAVE, + .instance_size = sizeof(XilinxSlaveSerialState), + .class_init = xilinx_slave_serial_class_init, +}; + +static void xilinx_slave_serial_register_type(void) +{ + type_register_static(&xilinx_slave_serial_info); +} +type_init(xilinx_slave_serial_register_type) diff --git a/include/hw/misc/xilinx_slave_serial.h b/include/hw/misc/xilinx_slave_serial.h new file mode 100644 index 0000000000..f7b2e22be3 --- /dev/null +++ b/include/hw/misc/xilinx_slave_serial.h @@ -0,0 +1,21 @@ +#ifndef XILINX_SLAVE_SERIAL_H +#define XILINX_SLAVE_SERIAL_H + +#include "hw/ssi/ssi.h" + +typedef struct XilinxSlaveSerialState { + /*< private >*/ + SSISlave parent_obj; + + qemu_irq done; + int state; +} XilinxSlaveSerialState; + +#define TYPE_XILINX_SLAVE_SERIAL "xilinx:slave-serial" +#define XILINX_SLAVE_SERIAL(obj) \ + OBJECT_CHECK(XilinxSlaveSerialState, (obj), TYPE_XILINX_SLAVE_SERIAL) + +#define XILINX_SLAVE_SERIAL_GPIO_DONE "xilinx:slave-serial:done" +#define XILINX_SLAVE_SERIAL_GPIO_PROG_B "xilinx:slave-serial:prog-b" + +#endif /* XILINX_SLAVE_SERIAL_H */ -- 2.14.3
