hw/gpio: Add GPIO model for Nuvoton NPCM7xx

The NPCM7xx chips have multiple GPIO controllers that are mostly
identical except for some minor differences like the reset values of
some registers. Each controller controls up to 32 pins.

Each individual pin is modeled as a pair of unnamed GPIOs -- one for
emitting the actual pin state, and one for driving the pin externally.
Like the nRF51 GPIO controller, a gpio level may be negative, which
means the pin is not driven, or floating.

Reviewed-by: Tyrone Ting <kfting@nuvoton.com>
Signed-off-by: Havard Skinnemoen <hskinnemoen@google.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 55 insertions, 0 deletions

diff --git a/include/hw/gpio/npcm7xx_gpio.h b/include/hw/gpio/npcm7xx_gpio.h
new file mode 100644
index 0000000..b1d771b
--- /dev/null
+++ b/include/hw/gpio/npcm7xx_gpio.h
@@ -0,0 +1,55 @@
+/*
+ * Nuvoton NPCM7xx General Purpose Input / Output (GPIO)
+ *
+ * Copyright 2020 Google LLC
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * 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.
+ */
+#ifndef NPCM7XX_GPIO_H
+#define NPCM7XX_GPIO_H
+
+#include "exec/memory.h"
+#include "hw/sysbus.h"
+
+/* Number of pins managed by each controller. */
+#define NPCM7XX_GPIO_NR_PINS (32)
+
+/*
+ * Number of registers in our device state structure. Don't change this without
+ * incrementing the version_id in the vmstate.
+ */
+#define NPCM7XX_GPIO_NR_REGS (0x80 / sizeof(uint32_t))
+
+typedef struct NPCM7xxGPIOState {
+    SysBusDevice parent;
+
+    /* Properties to be defined by the SoC */
+    uint32_t reset_pu;
+    uint32_t reset_pd;
+    uint32_t reset_osrc;
+    uint32_t reset_odsc;
+
+    MemoryRegion mmio;
+
+    qemu_irq irq;
+    qemu_irq output[NPCM7XX_GPIO_NR_PINS];
+
+    uint32_t pin_level;
+    uint32_t ext_level;
+    uint32_t ext_driven;
+
+    uint32_t regs[NPCM7XX_GPIO_NR_REGS];
+} NPCM7xxGPIOState;
+
+#define TYPE_NPCM7XX_GPIO "npcm7xx-gpio"
+#define NPCM7XX_GPIO(obj) \
+    OBJECT_CHECK(NPCM7xxGPIOState, (obj), TYPE_NPCM7XX_GPIO)
+
+#endif /* NPCM7XX_GPIO_H */