Initial commit

Kconfig

+config SPI_FT232H_USB
+	tristate "FTDI FT232H SPI controller"
+	depends on USB || COMPILE_TEST
+	help
+	  FT232H supports SPI in MPSSE mode. This driver provides MPSSE
+	  SPI controller in master mode.

Makefile

+KDIR ?= /lib/modules/$(shell uname -r)/build
+BUILD_DIR:=$(shell pwd)
+# KBUILD_OPTIONS += CROSS_COMPILE=arm-linux- ARCH=arm
+
+include $(KDIR)/.config
+obj-m += spi-ft232h.o
+
+all: modules
+modules:
+	$(MAKE) -C $(KDIR) M=$$PWD modules $(KBUILD_OPTIONS)
+

Makefile.diff

+obj-$(CONFIG_SPI_FT232H_USB)		+= spi-ft232h.o
+

ft232h-intf.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Common definitions for FTDI FT232H interface device
+ *
+ * Copyright (C) 2017 - 2018 DENX Software Engineering
+ * Anatolij Gustschin <agust@denx.de>
+ */
+
+#ifndef __LINUX_FT232H_INTF_H
+#define __LINUX_FT232H_INTF_H
+
+#define FTDI_CLK_6MHZ	6000000
+#define FTDI_CLK_30MHZ	30000000
+
+/* Used FTDI USB Requests */
+#define FTDI_SIO_RESET_REQUEST		0x00
+#define FTDI_SIO_SET_BAUDRATE_REQUEST	0x03
+#define FTDI_SIO_SET_LATENCY_TIMER_REQUEST	0x09
+#define FTDI_SIO_SET_BITMODE_REQUEST	0x0B
+#define FTDI_SIO_READ_PINS_REQUEST	0x0C
+#define FTDI_SIO_READ_EEPROM_REQUEST	0x90
+
+/* MPSSE Commands */
+#define TX_BYTES_RE_MSB		0x10 /* tx on +ve clk (rising edge) */
+#define TX_BYTES_FE_MSB		0x11 /* tx on -ve clk (falling edge) */
+#define RX_BYTES_RE_MSB		0x20
+#define RX_BYTES_FE_MSB		0x24
+#define TXF_RXR_BYTES_MSB	0x31 /* tx on -ve clk, rx on +ve */
+#define TXR_RXF_BYTES_MSB	0x34 /* tx on +ve clk, rx on -ve */
+
+#define TX_BYTES_RE_LSB		0x18 /* tx on +ve clk */
+#define TX_BYTES_FE_LSB		0x19 /* tx on -ve clk */
+#define RX_BYTES_RE_LSB		0x28
+#define RX_BYTES_FE_LSB		0x2C
+#define TXF_RXR_BYTES_LSB	0x39 /* tx on -ve clk, rx on +ve */
+#define TXR_RXF_BYTES_LSB	0x3C /* tx on +ve clk, rx on -ve */
+
+#define LOOPBACK_ON		0x84
+#define LOOPBACK_OFF		0x85
+#define TCK_DIVISOR		0x86
+#define DIS_DIV_5		0x8A
+#define EN_DIV_5		0x8B
+#define EN_3_PHASE		0x8C
+#define DIS_3_PHASE		0x8D
+#define DIS_ADAPTIVE		0x97
+
+#define FTDI_USB_READ_TIMEOUT	5000
+#define FTDI_USB_WRITE_TIMEOUT	5000
+
+/* MPSSE bitbang modes (copied from libftdi) */
+enum ftdi_mpsse_mode {
+	BITMODE_RESET	= 0x00,	/* switch off bitbang mode */
+	BITMODE_BITBANG	= 0x01,	/* asynchronous bitbang mode */
+	BITMODE_MPSSE	= 0x02,	/* MPSSE mode, on 2232x chips */
+	BITMODE_SYNCBB	= 0x04,	/* synchronous bitbang mode  */
+	BITMODE_MCU	= 0x08,	/* MCU Host Bus Emulation mode */
+				/* CPU-style fifo mode gets set via EEPROM */
+	BITMODE_OPTO	= 0x10,	/* Fast Opto-Isolated Serial Interface Mode */
+	BITMODE_CBUS	= 0x20,	/* Bitbang on CBUS pins, EEPROM config needed */
+	BITMODE_SYNCFF	= 0x40,	/* Single Channel Synchronous FIFO mode */
+	BITMODE_FT1284	= 0x80,	/* FT1284 mode, available on 232H chips */
+};
+
+struct ctrl_desc {
+	unsigned int dir_out;
+	u8 request;
+	u8 requesttype;
+	u16 value;
+	u16 index;
+	u16 size;
+	void *data;
+	int timeout;
+};
+
+struct bulk_desc {
+	unsigned int dir_out;
+	void *data;
+	int len;
+	int act_len;
+	int timeout;
+};
+
+/*
+ * struct ft232h_intf_ops - FT232H interface operations for upper drivers
+ *
+ * @bulk_xfer: FTDI USB bulk transfer
+ * @ctrl_xfer: FTDI USB control transfer
+ * @read_data: read 'len' bytes from FTDI device to the given buffer
+ * @write_data: write 'len' bytes from the given buffer to the FTDI device
+ * @lock: lock the interface for an operation sequence. Used when multiple
+ *	  command and/or data operations must be executed in a specific order
+ *	  (when other intermediate command/data transfers may not interfere)
+ * @unlock: unlock the previously locked interface
+ * @set_bitmode: configure FTDI bit mode
+ * @disable_bitbang: turn off bitbang mode
+ * @init_pins: initialize GPIOL/GPIOH port pins in MPSSE mode
+ * @cfg_bus_pins: configure MPSSE SPI bus pins
+ *
+ * Common FT232H interface USB xfer and device configuration operations used
+ * in FIFO-FPP, MPSSE-SPI or MPSSE-I2C drivers. Many of them are like FTDI
+ * protocol functions, which I mainly borrowed from libftdi
+ */
+struct ft232h_intf_ops {
+	int (*bulk_xfer)(struct usb_interface *intf, struct bulk_desc *desc);
+	int (*ctrl_xfer)(struct usb_interface *intf, struct ctrl_desc *desc);
+	int (*read_data)(struct usb_interface *intf, void *buf, size_t len);
+	int (*write_data)(struct usb_interface *intf, const char *buf,
+			  size_t len);
+	void (*lock)(struct usb_interface *intf);
+	void (*unlock)(struct usb_interface *intf);
+	int (*set_bitmode)(struct usb_interface *intf, unsigned char bitmask,
+			   unsigned char mode);
+	int (*disable_bitbang)(struct usb_interface *intf);
+	int (*init_pins)(struct usb_interface *intf, bool low, u8 bits, u8 dir);
+	int (*cfg_bus_pins)(struct usb_interface *intf, u8 dir_bits,
+			    u8 value_bits);
+	int (*set_clock)(struct usb_interface *intf, int clock_freq_hz);
+	int (*set_latency)(struct usb_interface *intf, int latency_msec);
+
+	int (*gpio_get)(struct usb_interface *intf, unsigned int offset);
+	void (*gpio_set)(struct usb_interface *intf, unsigned int offset, int value);
+	int (*gpio_direction_input)(struct usb_interface *intf, unsigned int offset);
+	int (*gpio_direction_output)(struct usb_interface *intf, unsigned int offset, int value);
+};
+
+/*
+ * struct mpsse_spi_platform_data - MPSSE SPI bus platform data
+ * @ops: USB interface operations used in MPSSE SPI controller driver
+ *
+ * MPSSE SPI bus specific platform data describing attached SPI slaves
+ * and optionally their additional I/O pins (.platform_data of spi_info)
+ */
+struct mpsse_spi_platform_data {
+	const struct ft232h_intf_ops *ops;
+};
+
+/*
+ * Value HIGH. rate is 12000000 / ((1 + value) * 2)
+ */
+static inline int div_value(int rate)
+{
+	int r;
+
+	if (rate >= 6000000)
+		return 0;
+	r = 6000000 / rate - 1;
+	if (r < 0xffff)
+		return r;
+	return 0xffff;
+}
+
+#endif /* __LINUX_FT232H_INTF_H */