hw/char: Add Microchip PolarFire SoC MMUART emulation

Microchip PolarFire SoC MMUART is ns16550 compatible, with some
additional registers. Create a simple MMUART model built on top
of the existing ns16550 model.

Signed-off-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <1598924352-89526-6-git-send-email-bmeng.cn@gmail.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

3 files changed, 90 insertions, 0 deletions

diff --git a/hw/char/Kconfig b/hw/char/Kconfig
index b7e0e4d5fa..1d645554c7 100644
--- a/hw/char/Kconfig
+++ b/hw/char/Kconfig
@@ -52,3 +52,6 @@ config RENESAS_SCI
 
 config AVR_USART
     bool
+
+config MCHP_PFSOC_MMUART
+    bool
diff --git a/hw/char/mchp_pfsoc_mmuart.c b/hw/char/mchp_pfsoc_mmuart.c
new file mode 100644
index 0000000000..8a002b0a19
--- /dev/null
+++ b/hw/char/mchp_pfsoc_mmuart.c
@@ -0,0 +1,86 @@
+/*
+ * Microchip PolarFire SoC MMUART emulation
+ *
+ * Copyright (c) 2020 Wind River Systems, Inc.
+ *
+ * Author:
+ *   Bin Meng <bin.meng@windriver.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 or
+ * (at your option) version 3 of the License.
+ *
+ * This program is distributed in the hope that 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 "qemu/log.h"
+#include "chardev/char.h"
+#include "exec/address-spaces.h"
+#include "hw/char/mchp_pfsoc_mmuart.h"
+
+static uint64_t mchp_pfsoc_mmuart_read(void *opaque, hwaddr addr, unsigned size)
+{
+    MchpPfSoCMMUartState *s = opaque;
+
+    if (addr >= MCHP_PFSOC_MMUART_REG_SIZE) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: read: addr=0x%" HWADDR_PRIx "\n",
+                      __func__, addr);
+        return 0;
+    }
+
+    return s->reg[addr / sizeof(uint32_t)];
+}
+
+static void mchp_pfsoc_mmuart_write(void *opaque, hwaddr addr,
+                                    uint64_t value, unsigned size)
+{
+    MchpPfSoCMMUartState *s = opaque;
+    uint32_t val32 = (uint32_t)value;
+
+    if (addr >= MCHP_PFSOC_MMUART_REG_SIZE) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: bad write: addr=0x%" HWADDR_PRIx
+                      " v=0x%x\n", __func__, addr, val32);
+        return;
+    }
+
+    s->reg[addr / sizeof(uint32_t)] = val32;
+}
+
+static const MemoryRegionOps mchp_pfsoc_mmuart_ops = {
+    .read = mchp_pfsoc_mmuart_read,
+    .write = mchp_pfsoc_mmuart_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+    .impl = {
+        .min_access_size = 4,
+        .max_access_size = 4,
+    },
+};
+
+MchpPfSoCMMUartState *mchp_pfsoc_mmuart_create(MemoryRegion *sysmem,
+    hwaddr base, qemu_irq irq, Chardev *chr)
+{
+    MchpPfSoCMMUartState *s;
+
+    s = g_new0(MchpPfSoCMMUartState, 1);
+
+    memory_region_init_io(&s->iomem, NULL, &mchp_pfsoc_mmuart_ops, s,
+                          "mchp.pfsoc.mmuart", 0x1000);
+
+    s->base = base;
+    s->irq = irq;
+
+    s->serial = serial_mm_init(sysmem, base, 2, irq, 399193, chr,
+                               DEVICE_LITTLE_ENDIAN);
+
+    memory_region_add_subregion(sysmem, base + 0x20, &s->iomem);
+
+    return s;
+}
diff --git a/hw/char/meson.build b/hw/char/meson.build
index e888215145..ae27932d00 100644
--- a/hw/char/meson.build
+++ b/hw/char/meson.build
@@ -32,6 +32,7 @@ softmmu_ss.add(when: 'CONFIG_RASPI', if_true: files('bcm2835_aux.c'))
 softmmu_ss.add(when: 'CONFIG_RENESAS_SCI', if_true: files('renesas_sci.c'))
 softmmu_ss.add(when: 'CONFIG_SH4', if_true: files('sh_serial.c'))
 softmmu_ss.add(when: 'CONFIG_STM32F2XX_USART', if_true: files('stm32f2xx_usart.c'))
+softmmu_ss.add(when: 'CONFIG_MCHP_PFSOC_MMUART', if_true: files('mchp_pfsoc_mmuart.c'))
 
 specific_ss.add(when: 'CONFIG_TERMINAL3270', if_true: files('terminal3270.c'))
 specific_ss.add(when: 'CONFIG_VIRTIO', if_true: files('virtio-serial-bus.c'))