hw/misc: Add a model of the Xilinx ZynqMP APU Control

Add a model of the Xilinx ZynqMP APU Control.

Reviewed-by: Luc Michel <luc@lmichel.fr>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Message-id: 20220316164645.2303510-6-edgar.iglesias@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 254 insertions, 0 deletions

diff --git a/hw/misc/meson.build b/hw/misc/meson.build
index 61397f3bbb..6fb69612e0 100644
--- a/hw/misc/meson.build
+++ b/hw/misc/meson.build
@@ -85,6 +85,7 @@ softmmu_ss.add(when: 'CONFIG_RASPI', if_true: files(
 softmmu_ss.add(when: 'CONFIG_SLAVIO', if_true: files('slavio_misc.c'))
 softmmu_ss.add(when: 'CONFIG_ZYNQ', if_true: files('zynq_slcr.c'))
 specific_ss.add(when: 'CONFIG_XLNX_ZYNQMP_ARM', if_true: files('xlnx-zynqmp-crf.c'))
+specific_ss.add(when: 'CONFIG_XLNX_ZYNQMP_ARM', if_true: files('xlnx-zynqmp-apu-ctrl.c'))
 softmmu_ss.add(when: 'CONFIG_XLNX_VERSAL', if_true: files(
   'xlnx-versal-xramc.c',
   'xlnx-versal-pmc-iou-slcr.c',
diff --git a/hw/misc/xlnx-zynqmp-apu-ctrl.c b/hw/misc/xlnx-zynqmp-apu-ctrl.c
new file mode 100644
index 0000000000..20de23cf67
--- /dev/null
+++ b/hw/misc/xlnx-zynqmp-apu-ctrl.c
@@ -0,0 +1,253 @@
+/*
+ * QEMU model of the ZynqMP APU Control.
+ *
+ * Copyright (c) 2013-2022 Xilinx Inc
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * Written by Peter Crosthwaite <peter.crosthwaite@xilinx.com> and
+ * Edgar E. Iglesias <edgar.iglesias@xilinx.com>
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "qemu/log.h"
+#include "migration/vmstate.h"
+#include "hw/qdev-properties.h"
+#include "hw/sysbus.h"
+#include "hw/irq.h"
+#include "hw/register.h"
+
+#include "qemu/bitops.h"
+#include "qapi/qmp/qerror.h"
+
+#include "hw/misc/xlnx-zynqmp-apu-ctrl.h"
+
+#ifndef XILINX_ZYNQMP_APU_ERR_DEBUG
+#define XILINX_ZYNQMP_APU_ERR_DEBUG 0
+#endif
+
+static void update_wfi_out(void *opaque)
+{
+    XlnxZynqMPAPUCtrl *s = XLNX_ZYNQMP_APU_CTRL(opaque);
+    unsigned int i, wfi_pending;
+
+    wfi_pending = s->cpu_pwrdwn_req & s->cpu_in_wfi;
+    for (i = 0; i < APU_MAX_CPU; i++) {
+        qemu_set_irq(s->wfi_out[i], !!(wfi_pending & (1 << i)));
+    }
+}
+
+static void zynqmp_apu_rvbar_post_write(RegisterInfo *reg, uint64_t val)
+{
+    XlnxZynqMPAPUCtrl *s = XLNX_ZYNQMP_APU_CTRL(reg->opaque);
+    int i;
+
+    for (i = 0; i < APU_MAX_CPU; ++i) {
+        uint64_t rvbar = s->regs[R_RVBARADDR0L + 2 * i] +
+                         ((uint64_t)s->regs[R_RVBARADDR0H + 2 * i] << 32);
+        if (s->cpus[i]) {
+            object_property_set_int(OBJECT(s->cpus[i]), "rvbar", rvbar,
+                                    &error_abort);
+        }
+    }
+}
+
+static void zynqmp_apu_pwrctl_post_write(RegisterInfo *reg, uint64_t val)
+{
+    XlnxZynqMPAPUCtrl *s = XLNX_ZYNQMP_APU_CTRL(reg->opaque);
+    unsigned int i, new;
+
+    for (i = 0; i < APU_MAX_CPU; i++) {
+        new = val & (1 << i);
+        /* Check if CPU's CPUPWRDNREQ has changed. If yes, update GPIOs. */
+        if (new != (s->cpu_pwrdwn_req & (1 << i))) {
+            qemu_set_irq(s->cpu_power_status[i], !!new);
+        }
+        s->cpu_pwrdwn_req &= ~(1 << i);
+        s->cpu_pwrdwn_req |= new;
+    }
+    update_wfi_out(s);
+}
+
+static void imr_update_irq(XlnxZynqMPAPUCtrl *s)
+{
+    bool pending = s->regs[R_ISR] & ~s->regs[R_IMR];
+    qemu_set_irq(s->irq_imr, pending);
+}
+
+static void isr_postw(RegisterInfo *reg, uint64_t val64)
+{
+    XlnxZynqMPAPUCtrl *s = XLNX_ZYNQMP_APU_CTRL(reg->opaque);
+    imr_update_irq(s);
+}
+
+static uint64_t ien_prew(RegisterInfo *reg, uint64_t val64)
+{
+    XlnxZynqMPAPUCtrl *s = XLNX_ZYNQMP_APU_CTRL(reg->opaque);
+    uint32_t val = val64;
+
+    s->regs[R_IMR] &= ~val;
+    imr_update_irq(s);
+    return 0;
+}
+
+static uint64_t ids_prew(RegisterInfo *reg, uint64_t val64)
+{
+    XlnxZynqMPAPUCtrl *s = XLNX_ZYNQMP_APU_CTRL(reg->opaque);
+    uint32_t val = val64;
+
+    s->regs[R_IMR] |= val;
+    imr_update_irq(s);
+    return 0;
+}
+
+static const RegisterAccessInfo zynqmp_apu_regs_info[] = {
+#define RVBAR_REGDEF(n) \
+    {   .name = "RVBAR CPU " #n " Low",  .addr = A_RVBARADDR ## n ## L,    \
+            .reset = 0xffff0000ul,                                         \
+            .post_write = zynqmp_apu_rvbar_post_write,                     \
+    },{ .name = "RVBAR CPU " #n " High", .addr = A_RVBARADDR ## n ## H,    \
+            .post_write = zynqmp_apu_rvbar_post_write,                     \
+    }
+    {   .name = "ERR_CTRL",  .addr = A_APU_ERR_CTRL,
+    },{ .name = "ISR",  .addr = A_ISR,
+        .w1c = 0x1,
+        .post_write = isr_postw,
+    },{ .name = "IMR",  .addr = A_IMR,
+        .reset = 0x1,
+        .ro = 0x1,
+    },{ .name = "IEN",  .addr = A_IEN,
+        .pre_write = ien_prew,
+    },{ .name = "IDS",  .addr = A_IDS,
+        .pre_write = ids_prew,
+    },{ .name = "CONFIG_0",  .addr = A_CONFIG_0,
+        .reset = 0xf0f,
+    },{ .name = "CONFIG_1",  .addr = A_CONFIG_1,
+    },
+    RVBAR_REGDEF(0),
+    RVBAR_REGDEF(1),
+    RVBAR_REGDEF(2),
+    RVBAR_REGDEF(3),
+    { .name = "ACE_CTRL",  .addr = A_ACE_CTRL,
+        .reset = 0xf000f,
+    },{ .name = "SNOOP_CTRL",  .addr = A_SNOOP_CTRL,
+    },{ .name = "PWRCTL",  .addr = A_PWRCTL,
+        .post_write = zynqmp_apu_pwrctl_post_write,
+    },{ .name = "PWRSTAT",  .addr = A_PWRSTAT,
+        .ro = 0x3000f,
+    }
+};
+
+static void zynqmp_apu_reset_enter(Object *obj, ResetType type)
+{
+    XlnxZynqMPAPUCtrl *s = XLNX_ZYNQMP_APU_CTRL(obj);
+    int i;
+
+    for (i = 0; i < APU_R_MAX; ++i) {
+        register_reset(&s->regs_info[i]);
+    }
+
+    s->cpu_pwrdwn_req = 0;
+    s->cpu_in_wfi = 0;
+}
+
+static void zynqmp_apu_reset_hold(Object *obj)
+{
+    XlnxZynqMPAPUCtrl *s = XLNX_ZYNQMP_APU_CTRL(obj);
+
+    update_wfi_out(s);
+    imr_update_irq(s);
+}
+
+static const MemoryRegionOps zynqmp_apu_ops = {
+    .read = register_read_memory,
+    .write = register_write_memory,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+    .valid = {
+        .min_access_size = 4,
+        .max_access_size = 4,
+    }
+};
+
+static void zynqmp_apu_handle_wfi(void *opaque, int irq, int level)
+{
+    XlnxZynqMPAPUCtrl *s = XLNX_ZYNQMP_APU_CTRL(opaque);
+
+    s->cpu_in_wfi = deposit32(s->cpu_in_wfi, irq, 1, level);
+    update_wfi_out(s);
+}
+
+static void zynqmp_apu_init(Object *obj)
+{
+    XlnxZynqMPAPUCtrl *s = XLNX_ZYNQMP_APU_CTRL(obj);
+    int i;
+
+    s->reg_array =
+        register_init_block32(DEVICE(obj), zynqmp_apu_regs_info,
+                              ARRAY_SIZE(zynqmp_apu_regs_info),
+                              s->regs_info, s->regs,
+                              &zynqmp_apu_ops,
+                              XILINX_ZYNQMP_APU_ERR_DEBUG,
+                              APU_R_MAX * 4);
+    sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->reg_array->mem);
+    sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq_imr);
+
+    for (i = 0; i < APU_MAX_CPU; ++i) {
+        g_autofree gchar *prop_name = g_strdup_printf("cpu%d", i);
+        object_property_add_link(obj, prop_name, TYPE_ARM_CPU,
+                                 (Object **)&s->cpus[i],
+                                 qdev_prop_allow_set_link_before_realize,
+                                 OBJ_PROP_LINK_STRONG);
+    }
+
+    /* wfi_out is used to connect to PMU GPIs. */
+    qdev_init_gpio_out_named(DEVICE(obj), s->wfi_out, "wfi_out", 4);
+    /* CPU_POWER_STATUS is used to connect to INTC redirect. */
+    qdev_init_gpio_out_named(DEVICE(obj), s->cpu_power_status,
+                             "CPU_POWER_STATUS", 4);
+    /* wfi_in is used as input from CPUs as wfi request. */
+    qdev_init_gpio_in_named(DEVICE(obj), zynqmp_apu_handle_wfi, "wfi_in", 4);
+}
+
+static void zynqmp_apu_finalize(Object *obj)
+{
+    XlnxZynqMPAPUCtrl *s = XLNX_ZYNQMP_APU_CTRL(obj);
+    register_finalize_block(s->reg_array);
+}
+
+static const VMStateDescription vmstate_zynqmp_apu = {
+    .name = TYPE_XLNX_ZYNQMP_APU_CTRL,
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT32_ARRAY(regs, XlnxZynqMPAPUCtrl, APU_R_MAX),
+        VMSTATE_END_OF_LIST(),
+    }
+};
+
+static void zynqmp_apu_class_init(ObjectClass *klass, void *data)
+{
+    ResettableClass *rc = RESETTABLE_CLASS(klass);
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->vmsd = &vmstate_zynqmp_apu;
+
+    rc->phases.enter = zynqmp_apu_reset_enter;
+    rc->phases.hold = zynqmp_apu_reset_hold;
+}
+
+static const TypeInfo zynqmp_apu_info = {
+    .name              = TYPE_XLNX_ZYNQMP_APU_CTRL,
+    .parent            = TYPE_SYS_BUS_DEVICE,
+    .instance_size     = sizeof(XlnxZynqMPAPUCtrl),
+    .class_init        = zynqmp_apu_class_init,
+    .instance_init     = zynqmp_apu_init,
+    .instance_finalize = zynqmp_apu_finalize,
+};
+
+static void zynqmp_apu_register_types(void)
+{
+    type_register_static(&zynqmp_apu_info);
+}
+
+type_init(zynqmp_apu_register_types)