1 files changed, 171 insertions, 0 deletions
diff --git a/debian/grub-extras/disabled/gpxe/src/include/gpxe/i2c.h b/debian/grub-extras/disabled/gpxe/src/include/gpxe/i2c.h
new file mode 100644
index 0000000..87b89d4
--- /dev/null
+++ b/debian/grub-extras/disabled/gpxe/src/include/gpxe/i2c.h
@@ -0,0 +1,171 @@
+#ifndef _GPXE_I2C_H
+#define _GPXE_I2C_H
+
+/** @file
+ *
+ * I2C interface
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stdint.h>
+#include <gpxe/bitbash.h>
+
+/** An I2C device
+ *
+ * An I2C device represents a specific slave device on an I2C bus.  It
+ * is accessed via an I2C interface.
+ */
+struct i2c_device {
+	/** Address of this device
+	 *
+	 * The actual address sent on the bus will look like
+	 *
+	 *    <start> <device address> <word address overflow> <r/w>
+	 *
+	 * The "word address overflow" is any excess bits from the
+	 * word address, i.e. any portion that does not fit within the
+	 * defined word address length.
+	 */
+	unsigned int dev_addr;
+	/** Device address length, in bytes
+	 *
+	 * This is the number of bytes that comprise the device
+	 * address, defined to be the portion that terminates with the
+	 * read/write bit.
+	 */
+	unsigned int dev_addr_len;
+	/** Word adddress length, in bytes
+	 *
+	 * This is the number of bytes that comprise the word address,
+	 * defined to be the portion that starts after the read/write
+	 * bit and ends before the first data byte.
+	 *
+	 * For some devices, this length will be zero (i.e. the word
+	 * address is contained entirely within the "word address
+	 * overflow").
+	 */
+	unsigned int word_addr_len;
+};
+
+/** An I2C interface
+ *
+ * An I2C interface provides access to an I2C bus, via which I2C
+ * devices may be reached.
+ */
+struct i2c_interface {
+	/**
+	 * Read data from I2C device
+	 *
+	 * @v i2c		I2C interface
+	 * @v i2cdev		I2C device
+	 * @v offset		Starting offset within the device
+	 * @v data		Data buffer
+	 * @v len		Length of data buffer
+	 * @ret rc		Return status code
+	 */
+	int ( * read ) ( struct i2c_interface *i2c, struct i2c_device *i2cdev,
+			 unsigned int offset, uint8_t *data,
+			 unsigned int len );
+	/**
+	 * Write data to I2C device
+	 *
+	 * @v i2c		I2C interface
+	 * @v i2cdev		I2C device
+	 * @v offset		Starting offset within the device
+	 * @v data		Data buffer
+	 * @v len		Length of data buffer
+	 * @ret rc		Return status code
+	 */
+	int ( * write ) ( struct i2c_interface *i2c, struct i2c_device *i2cdev,
+			  unsigned int offset, const uint8_t *data,
+			  unsigned int len );
+};
+
+/** A bit-bashing I2C interface
+ *
+ * This provides a standardised way to construct I2C buses via a
+ * bit-bashing interface.
+ */
+struct i2c_bit_basher {
+	/** I2C interface */
+	struct i2c_interface i2c;
+	/** Bit-bashing interface */
+	struct bit_basher basher;
+};
+
+/** Ten-bit address marker
+ *
+ * This value is ORed with the I2C device address to indicate a
+ * ten-bit address format on the bus.
+ */
+#define I2C_TENBIT_ADDRESS 0x7800
+
+/** An I2C write command */
+#define I2C_WRITE 0
+
+/** An I2C read command */
+#define I2C_READ 1
+
+/** Bit indices used for I2C bit-bashing interface */
+enum {
+	/** Serial clock */
+	I2C_BIT_SCL = 0,
+	/** Serial data */
+	I2C_BIT_SDA,
+};
+
+/** Delay required for bit-bashing operation */
+#define I2C_UDELAY 5
+
+/** Maximum number of cycles to use when attempting a bus reset */
+#define I2C_RESET_MAX_CYCLES 32
+
+/**
+ * Check presence of I2C device
+ *
+ * @v i2c		I2C interface
+ * @v i2cdev		I2C device
+ * @ret rc		Return status code
+ *
+ * Checks for the presence of the device on the I2C bus by attempting
+ * a zero-length write.
+ */
+static inline int i2c_check_presence ( struct i2c_interface *i2c,
+				       struct i2c_device *i2cdev ) {
+	return i2c->write ( i2c, i2cdev, 0, NULL, 0 );
+}
+
+extern int init_i2c_bit_basher ( struct i2c_bit_basher *i2cbit,
+				 struct bit_basher_operations *bash_op );
+
+/**
+ * Initialise generic I2C EEPROM device
+ *
+ * @v i2cdev		I2C device
+ */
+static inline __always_inline void
+init_i2c_eeprom ( struct i2c_device *i2cdev, unsigned int dev_addr ) {
+	i2cdev->dev_addr = dev_addr;
+	i2cdev->dev_addr_len = 1;
+	i2cdev->word_addr_len = 1;
+}
+
+/**
+ * Initialise Atmel AT24C11
+ *
+ * @v i2cdev		I2C device
+ */
+static inline __always_inline void
+init_at24c11 ( struct i2c_device *i2cdev ) {
+	/* This chip has no device address; it must be the only chip
+	 * on the bus.  The word address is contained entirely within
+	 * the device address field.
+	 */
+	i2cdev->dev_addr = 0;
+	i2cdev->dev_addr_len = 1;
+	i2cdev->word_addr_len = 0;
+}
+
+#endif /* _GPXE_I2C_H */