staging: sm750fb: remove ddk750_hwi2c

With the removal of ddk750_sii164.c, the functions in
ddk750_hwi2c are now also unused. This patch removes them
and the files they are in.

Signed-off-by: Ruben Wauters <rubenru09@aol.com>
Link: https://lore.kernel.org/r/20250418151755.42624-4-rubenru09@aol.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

4 files changed, 1 insertions, 263 deletions

diff --git a/drivers/staging/sm750fb/Makefile b/drivers/staging/sm750fb/Makefile
index b3cb973e2672..f7e227df0e54 100644
--- a/drivers/staging/sm750fb/Makefile
+++ b/drivers/staging/sm750fb/Makefile
@@ -3,4 +3,4 @@ obj-$(CONFIG_FB_SM750)	+= sm750fb.o
 
 sm750fb-objs		:= sm750.o sm750_hw.o sm750_accel.o sm750_cursor.o \
 			   ddk750_chip.o ddk750_power.o ddk750_mode.o \
-			   ddk750_display.o ddk750_swi2c.o ddk750_hwi2c.o 
+			   ddk750_display.o ddk750_swi2c.o
diff --git a/drivers/staging/sm750fb/ddk750.h b/drivers/staging/sm750fb/ddk750.h
index 64ef4d258a91..8a32f8cf3a98 100644
--- a/drivers/staging/sm750fb/ddk750.h
+++ b/drivers/staging/sm750fb/ddk750.h
@@ -14,8 +14,5 @@
 #include "ddk750_chip.h"
 #include "ddk750_display.h"
 #include "ddk750_power.h"
-#ifdef USE_HW_I2C
-#include "ddk750_hwi2c.h"
-#endif
 #include "ddk750_swi2c.h"
 #endif
diff --git a/drivers/staging/sm750fb/ddk750_hwi2c.c b/drivers/staging/sm750fb/ddk750_hwi2c.c
deleted file mode 100644
index 8482689b665b..000000000000
--- a/drivers/staging/sm750fb/ddk750_hwi2c.c
+++ /dev/null
@@ -1,247 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#define USE_HW_I2C
-#ifdef USE_HW_I2C
-#include "ddk750_chip.h"
-#include "ddk750_reg.h"
-#include "ddk750_hwi2c.h"
-#include "ddk750_power.h"
-
-#define MAX_HWI2C_FIFO                  16
-#define HWI2C_WAIT_TIMEOUT              0xF0000
-
-int sm750_hw_i2c_init(unsigned char bus_speed_mode)
-{
-	unsigned int value;
-
-	/* Enable GPIO 30 & 31 as IIC clock & data */
-	value = peek32(GPIO_MUX);
-
-	value |= (GPIO_MUX_30 | GPIO_MUX_31);
-	poke32(GPIO_MUX, value);
-
-	/*
-	 * Enable Hardware I2C power.
-	 * TODO: Check if we need to enable GPIO power?
-	 */
-	sm750_enable_i2c(1);
-
-	/* Enable the I2C Controller and set the bus speed mode */
-	value = peek32(I2C_CTRL) & ~(I2C_CTRL_MODE | I2C_CTRL_EN);
-	if (bus_speed_mode)
-		value |= I2C_CTRL_MODE;
-	value |= I2C_CTRL_EN;
-	poke32(I2C_CTRL, value);
-
-	return 0;
-}
-
-void sm750_hw_i2c_close(void)
-{
-	unsigned int value;
-
-	/* Disable I2C controller */
-	value = peek32(I2C_CTRL) & ~I2C_CTRL_EN;
-	poke32(I2C_CTRL, value);
-
-	/* Disable I2C Power */
-	sm750_enable_i2c(0);
-
-	/* Set GPIO 30 & 31 back as GPIO pins */
-	value = peek32(GPIO_MUX);
-	value &= ~GPIO_MUX_30;
-	value &= ~GPIO_MUX_31;
-	poke32(GPIO_MUX, value);
-}
-
-static long hw_i2c_wait_tx_done(void)
-{
-	unsigned int timeout;
-
-	/* Wait until the transfer is completed. */
-	timeout = HWI2C_WAIT_TIMEOUT;
-	while (!(peek32(I2C_STATUS) & I2C_STATUS_TX) && (timeout != 0))
-		timeout--;
-
-	if (timeout == 0)
-		return -1;
-
-	return 0;
-}
-
-/*
- *  This function writes data to the i2c slave device registers.
- *
- *  Parameters:
- *      addr            - i2c Slave device address
- *      length          - Total number of bytes to be written to the device
- *      buf             - The buffer that contains the data to be written to the
- *                     i2c device.
- *
- *  Return Value:
- *      Total number of bytes those are actually written.
- */
-static unsigned int hw_i2c_write_data(unsigned char addr,
-				      unsigned int length,
-				      unsigned char *buf)
-{
-	unsigned char count, i;
-	unsigned int total_bytes = 0;
-
-	/* Set the Device Address */
-	poke32(I2C_SLAVE_ADDRESS, addr & ~0x01);
-
-	/*
-	 * Write data.
-	 * Note:
-	 *      Only 16 byte can be accessed per i2c start instruction.
-	 */
-	do {
-		/*
-		 * Reset I2C by writing 0 to I2C_RESET register to
-		 * clear the previous status.
-		 */
-		poke32(I2C_RESET, 0);
-
-		/* Set the number of bytes to be written */
-		if (length < MAX_HWI2C_FIFO)
-			count = length - 1;
-		else
-			count = MAX_HWI2C_FIFO - 1;
-		poke32(I2C_BYTE_COUNT, count);
-
-		/* Move the data to the I2C data register */
-		for (i = 0; i <= count; i++)
-			poke32(I2C_DATA0 + i, *buf++);
-
-		/* Start the I2C */
-		poke32(I2C_CTRL, peek32(I2C_CTRL) | I2C_CTRL_CTRL);
-
-		/* Wait until the transfer is completed. */
-		if (hw_i2c_wait_tx_done() != 0)
-			break;
-
-		/* Subtract length */
-		length -= (count + 1);
-
-		/* Total byte written */
-		total_bytes += (count + 1);
-
-	} while (length > 0);
-
-	return total_bytes;
-}
-
-/*
- *  This function reads data from the slave device and stores them
- *  in the given buffer
- *
- *  Parameters:
- *      addr            - i2c Slave device address
- *      length          - Total number of bytes to be read
- *      buf             - Pointer to a buffer to be filled with the data read
- *                     from the slave device. It has to be the same size as the
- *                     length to make sure that it can keep all the data read.
- *
- *  Return Value:
- *      Total number of actual bytes read from the slave device
- */
-static unsigned int hw_i2c_read_data(unsigned char addr,
-				     unsigned int length,
-				     unsigned char *buf)
-{
-	unsigned char count, i;
-	unsigned int total_bytes = 0;
-
-	/* Set the Device Address */
-	poke32(I2C_SLAVE_ADDRESS, addr | 0x01);
-
-	/*
-	 * Read data and save them to the buffer.
-	 * Note:
-	 *      Only 16 byte can be accessed per i2c start instruction.
-	 */
-	do {
-		/*
-		 * Reset I2C by writing 0 to I2C_RESET register to
-		 * clear all the status.
-		 */
-		poke32(I2C_RESET, 0);
-
-		/* Set the number of bytes to be read */
-		if (length <= MAX_HWI2C_FIFO)
-			count = length - 1;
-		else
-			count = MAX_HWI2C_FIFO - 1;
-		poke32(I2C_BYTE_COUNT, count);
-
-		/* Start the I2C */
-		poke32(I2C_CTRL, peek32(I2C_CTRL) | I2C_CTRL_CTRL);
-
-		/* Wait until transaction done. */
-		if (hw_i2c_wait_tx_done() != 0)
-			break;
-
-		/* Save the data to the given buffer */
-		for (i = 0; i <= count; i++)
-			*buf++ = peek32(I2C_DATA0 + i);
-
-		/* Subtract length by 16 */
-		length -= (count + 1);
-
-		/* Number of bytes read. */
-		total_bytes += (count + 1);
-
-	} while (length > 0);
-
-	return total_bytes;
-}
-
-/*
- *  This function reads the slave device's register
- *
- *  Parameters:
- *      deviceAddress   - i2c Slave device address which register
- *                        to be read from
- *      registerIndex   - Slave device's register to be read
- *
- *  Return Value:
- *      Register value
- */
-unsigned char sm750_hw_i2c_read_reg(unsigned char addr, unsigned char reg)
-{
-	unsigned char value = 0xFF;
-
-	if (hw_i2c_write_data(addr, 1, &reg) == 1)
-		hw_i2c_read_data(addr, 1, &value);
-
-	return value;
-}
-
-/*
- *  This function writes a value to the slave device's register
- *
- *  Parameters:
- *      deviceAddress   - i2c Slave device address which register
- *                        to be written
- *      registerIndex   - Slave device's register to be written
- *      data            - Data to be written to the register
- *
- *  Result:
- *          0   - Success
- *         -1   - Fail
- */
-int sm750_hw_i2c_write_reg(unsigned char addr,
-			   unsigned char reg,
-			   unsigned char data)
-{
-	unsigned char value[2];
-
-	value[0] = reg;
-	value[1] = data;
-	if (hw_i2c_write_data(addr, 2, value) == 2)
-		return 0;
-
-	return -1;
-}
-
-#endif
diff --git a/drivers/staging/sm750fb/ddk750_hwi2c.h b/drivers/staging/sm750fb/ddk750_hwi2c.h
deleted file mode 100644
index 337c6493ca61..000000000000
--- a/drivers/staging/sm750fb/ddk750_hwi2c.h
+++ /dev/null
@@ -1,12 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef DDK750_HWI2C_H__
-#define DDK750_HWI2C_H__
-
-/* hwi2c functions */
-int sm750_hw_i2c_init(unsigned char bus_speed_mode);
-void sm750_hw_i2c_close(void);
-
-unsigned char sm750_hw_i2c_read_reg(unsigned char addr, unsigned char reg);
-int sm750_hw_i2c_write_reg(unsigned char addr, unsigned char reg,
-			   unsigned char data);
-#endif