From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:37571) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1du251-00071V-9e for qemu-devel@nongnu.org; Mon, 18 Sep 2017 15:51:44 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1du250-0006PA-7t for qemu-devel@nongnu.org; Mon, 18 Sep 2017 15:51:43 -0400 From: Andrey Smirnov Date: Mon, 18 Sep 2017 12:50:57 -0700 Message-Id: <20170918195100.17593-15-andrew.smirnov@gmail.com> In-Reply-To: <20170918195100.17593-1-andrew.smirnov@gmail.com> References: <20170918195100.17593-1-andrew.smirnov@gmail.com> Subject: [Qemu-devel] [PATCH 14/17] i.MX7: Add code to emulate SNVS IP-block List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-arm@nongnu.org Cc: Andrey Smirnov , Peter Maydell , qemu-devel@nongnu.org, yurovsky@gmail.com Add code to emulate SNVS IP-block. Currently only the bits needed to be able to emulate machine shutdown are implemented. Cc: Peter Maydell Cc: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org Cc: yurovsky@gmail.com Signed-off-by: Andrey Smirnov --- hw/misc/Makefile.objs | 1 + hw/misc/imx7_snvs.c | 84 +++++++++++++++++++++++++++++++++++++++++++++ include/hw/misc/imx7_snvs.h | 35 +++++++++++++++++++ 3 files changed, 120 insertions(+) create mode 100644 hw/misc/imx7_snvs.c create mode 100644 include/hw/misc/imx7_snvs.h diff --git a/hw/misc/Makefile.objs b/hw/misc/Makefile.objs index c393a93456..16cee88e0f 100644 --- a/hw/misc/Makefile.objs +++ b/hw/misc/Makefile.objs @@ -36,6 +36,7 @@ obj-$(CONFIG_IMX) += imx6_ccm.o obj-$(CONFIG_IMX) += imx6_src.o obj-$(CONFIG_IMX) += imx7_ccm.o obj-$(CONFIG_IMX) += imx2_wdt.o +obj-$(CONFIG_IMX) += imx7_snvs.o obj-$(CONFIG_MILKYMIST) += milkymist-hpdmc.o obj-$(CONFIG_MILKYMIST) += milkymist-pfpu.o obj-$(CONFIG_MAINSTONE) += mst_fpga.o diff --git a/hw/misc/imx7_snvs.c b/hw/misc/imx7_snvs.c new file mode 100644 index 0000000000..efce0a760f --- /dev/null +++ b/hw/misc/imx7_snvs.c @@ -0,0 +1,84 @@ +/* + * IMX7 Secure Non-Volatile Storage + * + * Copyright (c) 2017, Impinj, Inc. + * + * Author: Andrey Smirnov + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + * + * Bare minimum emulation code needed to support being able to shut + * down linux guest gracefully. + */ + +#include "qemu/osdep.h" +#include "qemu/sizes.h" +#include "hw/misc/imx7_snvs.h" +#include "qemu/log.h" +#include "sysemu/sysemu.h" + +static uint64_t imx7_snvs_read(void *opaque, hwaddr offset, unsigned size) +{ + return 0; +} + +static void imx7_snvs_write(void *opaque, hwaddr offset, + uint64_t v, unsigned size) +{ + const uint32_t value = v; + const uint32_t mask = SNVS_LPCR_TOP | SNVS_LPCR_DP_EN; + + if (offset == SNVS_LPCR && ((value & mask) == mask)) { + qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN); + } +} + +static const struct MemoryRegionOps imx7_snvs_ops = { + .read = imx7_snvs_read, + .write = imx7_snvs_write, + .endianness = DEVICE_NATIVE_ENDIAN, + .valid = { + /* + * Our device would not work correctly if the guest was doing + * unaligned access. This might not be a limitation on the real + * device but in practice there is no reason for a guest to access + * this device unaligned. + */ + .min_access_size = 4, + .max_access_size = 4, + .unaligned = false, + }, +}; + +static void imx7_snvs_init(Object *obj) +{ + SysBusDevice *sd = SYS_BUS_DEVICE(obj); + IMX7SNVSState *s = IMX7_SNVS(obj); + + memory_region_init_io(&s->mmio, obj, &imx7_snvs_ops, s, + TYPE_IMX7_SNVS, 0x1000); + + sysbus_init_mmio(sd, &s->mmio); +} + +static void imx7_snvs_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + + dc->desc = "i.MX7 Secure Non-Volatile Storage Module"; +} + +static const TypeInfo imx7_snvs_info = { + .name = TYPE_IMX7_SNVS, + .parent = TYPE_SYS_BUS_DEVICE, + .instance_size = sizeof(IMX7SNVSState), + .instance_init = imx7_snvs_init, + .class_init = imx7_snvs_class_init, +}; + +static void imx7_snvs_register_type(void) +{ + type_register_static(&imx7_snvs_info); +} +type_init(imx7_snvs_register_type) diff --git a/include/hw/misc/imx7_snvs.h b/include/hw/misc/imx7_snvs.h new file mode 100644 index 0000000000..255f8f26f9 --- /dev/null +++ b/include/hw/misc/imx7_snvs.h @@ -0,0 +1,35 @@ +/* + * Copyright (c) 2017, Impinj, Inc. + * + * i.MX7 SNVS block emulation code + * + * Author: Andrey Smirnov + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ + +#ifndef IMX7_SNVS_H +#define IMX7_SNVS_H + +#include "qemu/bitops.h" +#include "hw/sysbus.h" + + +enum IMX7SNVSRegisters { + SNVS_LPCR = 0x38, + SNVS_LPCR_TOP = BIT(6), + SNVS_LPCR_DP_EN = BIT(5) +}; + +#define TYPE_IMX7_SNVS "imx7.snvs" +#define IMX7_SNVS(obj) OBJECT_CHECK(IMX7SNVSState, (obj), TYPE_IMX7_SNVS) + +typedef struct IMX7SNVSState { + /* */ + SysBusDevice parent_obj; + + MemoryRegion mmio; +} IMX7SNVSState; + +#endif /* IMX7_SNVS_H */ -- 2.13.5