Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 58 insertions, 0 deletions

diff --git a/drivers/i2c/busses/i2c-stm32.h b/drivers/i2c/busses/i2c-stm32.h
new file mode 100644
index 000000000..868755f82
--- /dev/null
+++ b/drivers/i2c/busses/i2c-stm32.h
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * i2c-stm32.h
+ *
+ * Copyright (C) M'boumba Cedric Madianga 2017
+ * Copyright (C) STMicroelectronics 2017
+ * Author: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
+ *
+ */
+
+#ifndef _I2C_STM32_H
+#define _I2C_STM32_H
+
+#include <linux/dma-direction.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+
+enum stm32_i2c_speed {
+	STM32_I2C_SPEED_STANDARD, /* 100 kHz */
+	STM32_I2C_SPEED_FAST, /* 400 kHz */
+	STM32_I2C_SPEED_FAST_PLUS, /* 1 MHz */
+	STM32_I2C_SPEED_END,
+};
+
+/**
+ * struct stm32_i2c_dma - DMA specific data
+ * @chan_tx: dma channel for TX transfer
+ * @chan_rx: dma channel for RX transfer
+ * @chan_using: dma channel used for the current transfer (TX or RX)
+ * @dma_buf: dma buffer
+ * @dma_len: dma buffer len
+ * @dma_transfer_dir: dma transfer direction indicator
+ * @dma_data_dir: dma transfer mode indicator
+ * @dma_complete: dma transfer completion
+ */
+struct stm32_i2c_dma {
+	struct dma_chan *chan_tx;
+	struct dma_chan *chan_rx;
+	struct dma_chan *chan_using;
+	dma_addr_t dma_buf;
+	unsigned int dma_len;
+	enum dma_transfer_direction dma_transfer_dir;
+	enum dma_data_direction dma_data_dir;
+	struct completion dma_complete;
+};
+
+struct stm32_i2c_dma *stm32_i2c_dma_request(struct device *dev,
+					    dma_addr_t phy_addr,
+					    u32 txdr_offset, u32 rxdr_offset);
+
+void stm32_i2c_dma_free(struct stm32_i2c_dma *dma);
+
+int stm32_i2c_prep_dma_xfer(struct device *dev, struct stm32_i2c_dma *dma,
+			    bool rd_wr, u32 len, u8 *buf,
+			    dma_async_tx_callback callback,
+			    void *dma_async_param);
+
+#endif /* _I2C_STM32_H */