riscv: sifive: Implement PRCI model for FU540

This adds a simple PRCI model for FU540 (sifive_u). It has different
register layout from the existing PRCI model for FE310 (sifive_e).

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>

1 files changed, 169 insertions, 0 deletions

diff --git a/hw/riscv/sifive_u_prci.c b/hw/riscv/sifive_u_prci.c
new file mode 100644
index 0000000000..4fa590c064
--- /dev/null
+++ b/hw/riscv/sifive_u_prci.c
@@ -0,0 +1,169 @@
+/*
+ * QEMU SiFive U PRCI (Power, Reset, Clock, Interrupt)
+ *
+ * Copyright (c) 2019 Bin Meng <bmeng.cn@gmail.com>
+ *
+ * Simple model of the PRCI to emulate register reads made by the SDK BSP
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2 or later, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/sysbus.h"
+#include "qemu/log.h"
+#include "qemu/module.h"
+#include "hw/riscv/sifive_u_prci.h"
+
+static uint64_t sifive_u_prci_read(void *opaque, hwaddr addr, unsigned int size)
+{
+    SiFiveUPRCIState *s = opaque;
+
+    switch (addr) {
+    case SIFIVE_U_PRCI_HFXOSCCFG:
+        return s->hfxosccfg;
+    case SIFIVE_U_PRCI_COREPLLCFG0:
+        return s->corepllcfg0;
+    case SIFIVE_U_PRCI_DDRPLLCFG0:
+        return s->ddrpllcfg0;
+    case SIFIVE_U_PRCI_DDRPLLCFG1:
+        return s->ddrpllcfg1;
+    case SIFIVE_U_PRCI_GEMGXLPLLCFG0:
+        return s->gemgxlpllcfg0;
+    case SIFIVE_U_PRCI_GEMGXLPLLCFG1:
+        return s->gemgxlpllcfg1;
+    case SIFIVE_U_PRCI_CORECLKSEL:
+        return s->coreclksel;
+    case SIFIVE_U_PRCI_DEVICESRESET:
+        return s->devicesreset;
+    case SIFIVE_U_PRCI_CLKMUXSTATUS:
+        return s->clkmuxstatus;
+    }
+
+    qemu_log_mask(LOG_GUEST_ERROR, "%s: read: addr=0x%" HWADDR_PRIx "\n",
+                  __func__, addr);
+
+    return 0;
+}
+
+static void sifive_u_prci_write(void *opaque, hwaddr addr,
+                                uint64_t val64, unsigned int size)
+{
+    SiFiveUPRCIState *s = opaque;
+    uint32_t val32 = (uint32_t)val64;
+
+    switch (addr) {
+    case SIFIVE_U_PRCI_HFXOSCCFG:
+        s->hfxosccfg = val32;
+        /* OSC stays ready */
+        s->hfxosccfg |= SIFIVE_U_PRCI_HFXOSCCFG_RDY;
+        break;
+    case SIFIVE_U_PRCI_COREPLLCFG0:
+        s->corepllcfg0 = val32;
+        /* internal feedback */
+        s->corepllcfg0 |= SIFIVE_U_PRCI_PLLCFG0_FSE;
+        /* PLL stays locked */
+        s->corepllcfg0 |= SIFIVE_U_PRCI_PLLCFG0_LOCK;
+        break;
+    case SIFIVE_U_PRCI_DDRPLLCFG0:
+        s->ddrpllcfg0 = val32;
+        /* internal feedback */
+        s->ddrpllcfg0 |= SIFIVE_U_PRCI_PLLCFG0_FSE;
+        /* PLL stays locked */
+        s->ddrpllcfg0 |= SIFIVE_U_PRCI_PLLCFG0_LOCK;
+        break;
+    case SIFIVE_U_PRCI_DDRPLLCFG1:
+        s->ddrpllcfg1 = val32;
+        break;
+    case SIFIVE_U_PRCI_GEMGXLPLLCFG0:
+        s->gemgxlpllcfg0 = val32;
+        /* internal feedback */
+        s->gemgxlpllcfg0 |= SIFIVE_U_PRCI_PLLCFG0_FSE;
+        /* PLL stays locked */
+        s->gemgxlpllcfg0 |= SIFIVE_U_PRCI_PLLCFG0_LOCK;
+        break;
+    case SIFIVE_U_PRCI_GEMGXLPLLCFG1:
+        s->gemgxlpllcfg1 = val32;
+        break;
+    case SIFIVE_U_PRCI_CORECLKSEL:
+        s->coreclksel = val32;
+        break;
+    case SIFIVE_U_PRCI_DEVICESRESET:
+        s->devicesreset = val32;
+        break;
+    case SIFIVE_U_PRCI_CLKMUXSTATUS:
+        s->clkmuxstatus = val32;
+        break;
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: bad write: addr=0x%" HWADDR_PRIx
+                      " v=0x%x\n", __func__, addr, val32);
+    }
+}
+
+static const MemoryRegionOps sifive_u_prci_ops = {
+    .read = sifive_u_prci_read,
+    .write = sifive_u_prci_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+    .valid = {
+        .min_access_size = 4,
+        .max_access_size = 4
+    }
+};
+
+static void sifive_u_prci_realize(DeviceState *dev, Error **errp)
+{
+    SiFiveUPRCIState *s = SIFIVE_U_PRCI(dev);
+
+    memory_region_init_io(&s->mmio, OBJECT(dev), &sifive_u_prci_ops, s,
+                          TYPE_SIFIVE_U_PRCI, SIFIVE_U_PRCI_REG_SIZE);
+    sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->mmio);
+}
+
+static void sifive_u_prci_reset(DeviceState *dev)
+{
+    SiFiveUPRCIState *s = SIFIVE_U_PRCI(dev);
+
+    /* Initialize register to power-on-reset values */
+    s->hfxosccfg = SIFIVE_U_PRCI_HFXOSCCFG_RDY | SIFIVE_U_PRCI_HFXOSCCFG_EN;
+    s->corepllcfg0 = SIFIVE_U_PRCI_PLLCFG0_DIVR | SIFIVE_U_PRCI_PLLCFG0_DIVF |
+                     SIFIVE_U_PRCI_PLLCFG0_DIVQ | SIFIVE_U_PRCI_PLLCFG0_FSE |
+                     SIFIVE_U_PRCI_PLLCFG0_LOCK;
+    s->ddrpllcfg0 = SIFIVE_U_PRCI_PLLCFG0_DIVR | SIFIVE_U_PRCI_PLLCFG0_DIVF |
+                    SIFIVE_U_PRCI_PLLCFG0_DIVQ | SIFIVE_U_PRCI_PLLCFG0_FSE |
+                    SIFIVE_U_PRCI_PLLCFG0_LOCK;
+    s->gemgxlpllcfg0 = SIFIVE_U_PRCI_PLLCFG0_DIVR | SIFIVE_U_PRCI_PLLCFG0_DIVF |
+                       SIFIVE_U_PRCI_PLLCFG0_DIVQ | SIFIVE_U_PRCI_PLLCFG0_FSE |
+                       SIFIVE_U_PRCI_PLLCFG0_LOCK;
+    s->coreclksel = SIFIVE_U_PRCI_CORECLKSEL_HFCLK;
+}
+
+static void sifive_u_prci_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->realize = sifive_u_prci_realize;
+    dc->reset = sifive_u_prci_reset;
+}
+
+static const TypeInfo sifive_u_prci_info = {
+    .name          = TYPE_SIFIVE_U_PRCI,
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(SiFiveUPRCIState),
+    .class_init    = sifive_u_prci_class_init,
+};
+
+static void sifive_u_prci_register_types(void)
+{
+    type_register_static(&sifive_u_prci_info);
+}
+
+type_init(sifive_u_prci_register_types)