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authorHao Wu <wuhaotsh@google.com>2021-02-10 14:04:22 -0800
committerPeter Maydell <peter.maydell@linaro.org>2021-02-16 13:49:28 +0000
commit94e778793954afc6ed47ef8e161044c79488e446 (patch)
treeb00da3b67b101fffd0a438a50d063f7c6a698a69 /include/hw/i2c
parent36cd5fbdbf4e1cb540d479e9b1708cdd81dac298 (diff)
hw/i2c: Implement NPCM7XX SMBus Module Single Mode
This commit implements the single-byte mode of the SMBus. Each Nuvoton SoC has 16 System Management Bus (SMBus). These buses compliant with SMBus and I2C protocol. This patch implements the single-byte mode of the SMBus. In this mode, the user sends or receives a byte each time. The SMBus device transmits it to the underlying i2c device and sends an interrupt back to the QEMU guest. Reviewed-by: Doug Evans<dje@google.com> Reviewed-by: Tyrong Ting<kfting@nuvoton.com> Signed-off-by: Hao Wu <wuhaotsh@google.com> Reviewed-by: Corey Minyard <cminyard@mvista.com> Message-id: 20210210220426.3577804-2-wuhaotsh@google.com Acked-by: Corey Minyard <cminyard@mvista.com> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'include/hw/i2c')
-rw-r--r--include/hw/i2c/npcm7xx_smbus.h88
1 files changed, 88 insertions, 0 deletions
diff --git a/include/hw/i2c/npcm7xx_smbus.h b/include/hw/i2c/npcm7xx_smbus.h
new file mode 100644
index 0000000000..b9761a6993
--- /dev/null
+++ b/include/hw/i2c/npcm7xx_smbus.h
@@ -0,0 +1,88 @@
+/*
+ * Nuvoton NPCM7xx SMBus Module.
+ *
+ * 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 as published by the
+ * Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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_SMBUS_H
+#define NPCM7XX_SMBUS_H
+
+#include "exec/memory.h"
+#include "hw/i2c/i2c.h"
+#include "hw/irq.h"
+#include "hw/sysbus.h"
+
+/*
+ * Number of addresses this module contains. Do not change this without
+ * incrementing the version_id in the vmstate.
+ */
+#define NPCM7XX_SMBUS_NR_ADDRS 10
+
+typedef enum NPCM7xxSMBusStatus {
+ NPCM7XX_SMBUS_STATUS_IDLE,
+ NPCM7XX_SMBUS_STATUS_SENDING,
+ NPCM7XX_SMBUS_STATUS_RECEIVING,
+ NPCM7XX_SMBUS_STATUS_NEGACK,
+ NPCM7XX_SMBUS_STATUS_STOPPING_LAST_RECEIVE,
+ NPCM7XX_SMBUS_STATUS_STOPPING_NEGACK,
+} NPCM7xxSMBusStatus;
+
+/*
+ * struct NPCM7xxSMBusState - System Management Bus device state.
+ * @bus: The underlying I2C Bus.
+ * @irq: GIC interrupt line to fire on events (if enabled).
+ * @sda: The serial data register.
+ * @st: The status register.
+ * @cst: The control status register.
+ * @cst2: The control status register 2.
+ * @cst3: The control status register 3.
+ * @ctl1: The control register 1.
+ * @ctl2: The control register 2.
+ * @ctl3: The control register 3.
+ * @ctl4: The control register 4.
+ * @ctl5: The control register 5.
+ * @addr: The SMBus module's own addresses on the I2C bus.
+ * @scllt: The SCL low time register.
+ * @sclht: The SCL high time register.
+ * @status: The current status of the SMBus.
+ */
+typedef struct NPCM7xxSMBusState {
+ SysBusDevice parent;
+
+ MemoryRegion iomem;
+
+ I2CBus *bus;
+ qemu_irq irq;
+
+ uint8_t sda;
+ uint8_t st;
+ uint8_t cst;
+ uint8_t cst2;
+ uint8_t cst3;
+ uint8_t ctl1;
+ uint8_t ctl2;
+ uint8_t ctl3;
+ uint8_t ctl4;
+ uint8_t ctl5;
+ uint8_t addr[NPCM7XX_SMBUS_NR_ADDRS];
+
+ uint8_t scllt;
+ uint8_t sclht;
+
+ NPCM7xxSMBusStatus status;
+} NPCM7xxSMBusState;
+
+#define TYPE_NPCM7XX_SMBUS "npcm7xx-smbus"
+#define NPCM7XX_SMBUS(obj) OBJECT_CHECK(NPCM7xxSMBusState, (obj), \
+ TYPE_NPCM7XX_SMBUS)
+
+#endif /* NPCM7XX_SMBUS_H */