gpio: i8255: Remove unused legacy interface

All i8255 library consumers have migrated to the new interface
leveraging the gpio-regmap API. Legacy interface functions and code are
removed as no longer needed.

Suggested-by: Andy Shevchenko <[e-mail]>
Reviewed-by: Andy Shevchenko <[e-mail]>
Signed-off-by: William Breathitt Gray <[e-mail]>
Signed-off-by: Bartosz Golaszewski <[e-mail]>

drivers/gpio/gpio-i8255.c

···
  * Intel 8255 Programmable Peripheral Interface
  * Copyright (C) 2022 William Breathitt Gray
  */
-#include <linux/bitmap.h>
+#include <linux/bits.h>
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/export.h>
 #include <linux/gpio/regmap.h>
-#include <linux/io.h>
 #include <linux/module.h>
 #include <linux/regmap.h>
-#include <linux/spinlock.h>
-#include <linux/types.h>
 
 #include "gpio-i8255.h"
 
···
 #define I8255_CONTROL 0x3
 #define I8255_REG_DAT_BASE I8255_PORTA
 #define I8255_REG_DIR_IN_BASE I8255_CONTROL
-
-static int i8255_get_port(struct i8255 __iomem *const ppi,
-			  const unsigned long io_port, const unsigned long mask)
-{
-	const unsigned long bank = io_port / 3;
-	const unsigned long ppi_port = io_port % 3;
-
-	return ioread8(&ppi[bank].port[ppi_port]) & mask;
-}
 
 static int i8255_direction_mask(const unsigned int offset)
 {
···
 		return -EINVAL;
 	}
 }
-
-static void i8255_set_port(struct i8255 __iomem *const ppi,
-			   struct i8255_state *const state,
-			   const unsigned long io_port,
-			   const unsigned long mask, const unsigned long bits)
-{
-	const unsigned long bank = io_port / 3;
-	const unsigned long ppi_port = io_port % 3;
-	unsigned long flags;
-	unsigned long out_state;
-
-	spin_lock_irqsave(&state[bank].lock, flags);
-
-	out_state = ioread8(&ppi[bank].port[ppi_port]);
-	out_state = (out_state & ~mask) | (bits & mask);
-	iowrite8(out_state, &ppi[bank].port[ppi_port]);
-
-	spin_unlock_irqrestore(&state[bank].lock, flags);
-}
-
-/**
- * i8255_direction_input - configure signal offset as input
- * @ppi:	Intel 8255 Programmable Peripheral Interface banks
- * @state:	devices states of the respective PPI banks
- * @offset:	signal offset to configure as input
- *
- * Configures a signal @offset as input for the respective Intel 8255
- * Programmable Peripheral Interface (@ppi) banks. The @state control_state
- * values are updated to reflect the new configuration.
- */
-void i8255_direction_input(struct i8255 __iomem *const ppi,
-			   struct i8255_state *const state,
-			   const unsigned long offset)
-{
-	const unsigned long io_port = offset / 8;
-	const unsigned long bank = io_port / 3;
-	unsigned long flags;
-
-	spin_lock_irqsave(&state[bank].lock, flags);
-
-	state[bank].control_state |= I8255_CONTROL_MODE_SET;
-	state[bank].control_state |= i8255_direction_mask(offset % 24);
-
-	iowrite8(state[bank].control_state, &ppi[bank].control);
-
-	spin_unlock_irqrestore(&state[bank].lock, flags);
-}
-EXPORT_SYMBOL_NS_GPL(i8255_direction_input, I8255);
-
-/**
- * i8255_direction_output - configure signal offset as output
- * @ppi:	Intel 8255 Programmable Peripheral Interface banks
- * @state:	devices states of the respective PPI banks
- * @offset:	signal offset to configure as output
- * @value:	signal value to output
- *
- * Configures a signal @offset as output for the respective Intel 8255
- * Programmable Peripheral Interface (@ppi) banks and sets the respective signal
- * output to the desired @value. The @state control_state values are updated to
- * reflect the new configuration.
- */
-void i8255_direction_output(struct i8255 __iomem *const ppi,
-			    struct i8255_state *const state,
-			    const unsigned long offset,
-			    const unsigned long value)
-{
-	const unsigned long io_port = offset / 8;
-	const unsigned long bank = io_port / 3;
-	unsigned long flags;
-
-	spin_lock_irqsave(&state[bank].lock, flags);
-
-	state[bank].control_state |= I8255_CONTROL_MODE_SET;
-	state[bank].control_state &= ~i8255_direction_mask(offset % 24);
-
-	iowrite8(state[bank].control_state, &ppi[bank].control);
-
-	spin_unlock_irqrestore(&state[bank].lock, flags);
-
-	i8255_set(ppi, state, offset, value);
-}
-EXPORT_SYMBOL_NS_GPL(i8255_direction_output, I8255);
-
-/**
- * i8255_get - get signal value at signal offset
- * @ppi:	Intel 8255 Programmable Peripheral Interface banks
- * @offset:	offset of signal to get
- *
- * Returns the signal value (0=low, 1=high) for the signal at @offset for the
- * respective Intel 8255 Programmable Peripheral Interface (@ppi) banks.
- */
-int i8255_get(struct i8255 __iomem *const ppi, const unsigned long offset)
-{
-	const unsigned long io_port = offset / 8;
-	const unsigned long offset_mask = BIT(offset % 8);
-
-	return !!i8255_get_port(ppi, io_port, offset_mask);
-}
-EXPORT_SYMBOL_NS_GPL(i8255_get, I8255);
-
-/**
- * i8255_get_direction - get the I/O direction for a signal offset
- * @state:	devices states of the respective PPI banks
- * @offset:	offset of signal to get direction
- *
- * Returns the signal direction (0=output, 1=input) for the signal at @offset.
- */
-int i8255_get_direction(const struct i8255_state *const state,
-			const unsigned long offset)
-{
-	const unsigned long io_port = offset / 8;
-	const unsigned long bank = io_port / 3;
-
-	return !!(state[bank].control_state & i8255_direction_mask(offset % 24));
-}
-EXPORT_SYMBOL_NS_GPL(i8255_get_direction, I8255);
-
-/**
- * i8255_get_multiple - get multiple signal values at multiple signal offsets
- * @ppi:	Intel 8255 Programmable Peripheral Interface banks
- * @mask:	mask of signals to get
- * @bits:	bitmap to store signal values
- * @ngpio:	number of GPIO signals of the respective PPI banks
- *
- * Stores in @bits the values (0=low, 1=high) for the signals defined by @mask
- * for the respective Intel 8255 Programmable Peripheral Interface (@ppi) banks.
- */
-void i8255_get_multiple(struct i8255 __iomem *const ppi,
-			const unsigned long *const mask,
-			unsigned long *const bits, const unsigned long ngpio)
-{
-	unsigned long offset;
-	unsigned long port_mask;
-	unsigned long io_port;
-	unsigned long port_state;
-
-	bitmap_zero(bits, ngpio);
-
-	for_each_set_clump8(offset, port_mask, mask, ngpio) {
-		io_port = offset / 8;
-		port_state = i8255_get_port(ppi, io_port, port_mask);
-
-		bitmap_set_value8(bits, port_state, offset);
-	}
-}
-EXPORT_SYMBOL_NS_GPL(i8255_get_multiple, I8255);
-
-/**
- * i8255_mode0_output - configure all PPI ports to MODE 0 output mode
- * @ppi:	Intel 8255 Programmable Peripheral Interface bank
- *
- * Configures all Intel 8255 Programmable Peripheral Interface (@ppi) ports to
- * MODE 0 (Basic Input/Output) output mode.
- */
-void i8255_mode0_output(struct i8255 __iomem *const ppi)
-{
-	iowrite8(I8255_CONTROL_MODE_SET, &ppi->control);
-}
-EXPORT_SYMBOL_NS_GPL(i8255_mode0_output, I8255);
-
-/**
- * i8255_set - set signal value at signal offset
- * @ppi:	Intel 8255 Programmable Peripheral Interface banks
- * @state:	devices states of the respective PPI banks
- * @offset:	offset of signal to set
- * @value:	value of signal to set
- *
- * Assigns output @value for the signal at @offset for the respective Intel 8255
- * Programmable Peripheral Interface (@ppi) banks.
- */
-void i8255_set(struct i8255 __iomem *const ppi, struct i8255_state *const state,
-	       const unsigned long offset, const unsigned long value)
-{
-	const unsigned long io_port = offset / 8;
-	const unsigned long port_offset = offset % 8;
-	const unsigned long mask = BIT(port_offset);
-	const unsigned long bits = value << port_offset;
-
-	i8255_set_port(ppi, state, io_port, mask, bits);
-}
-EXPORT_SYMBOL_NS_GPL(i8255_set, I8255);
-
-/**
- * i8255_set_multiple - set signal values at multiple signal offsets
- * @ppi:	Intel 8255 Programmable Peripheral Interface banks
- * @state:	devices states of the respective PPI banks
- * @mask:	mask of signals to set
- * @bits:	bitmap of signal output values
- * @ngpio:	number of GPIO signals of the respective PPI banks
- *
- * Assigns output values defined by @bits for the signals defined by @mask for
- * the respective Intel 8255 Programmable Peripheral Interface (@ppi) banks.
- */
-void i8255_set_multiple(struct i8255 __iomem *const ppi,
-			struct i8255_state *const state,
-			const unsigned long *const mask,
-			const unsigned long *const bits,
-			const unsigned long ngpio)
-{
-	unsigned long offset;
-	unsigned long port_mask;
-	unsigned long io_port;
-	unsigned long value;
-
-	for_each_set_clump8(offset, port_mask, mask, ngpio) {
-		io_port = offset / 8;
-		value = bitmap_get_value8(bits, offset);
-		i8255_set_port(ppi, state, io_port, port_mask, value);
-	}
-}
-EXPORT_SYMBOL_NS_GPL(i8255_set_multiple, I8255);
-
-/**
- * i8255_state_init - initialize i8255_state structure
- * @state:	devices states of the respective PPI banks
- * @nbanks:	number of Intel 8255 Programmable Peripheral Interface banks
- *
- * Initializes the @state of each Intel 8255 Programmable Peripheral Interface
- * bank for use in i8255 library functions.
- */
-void i8255_state_init(struct i8255_state *const state,
-		      const unsigned long nbanks)
-{
-	unsigned long bank;
-
-	for (bank = 0; bank < nbanks; bank++)
-		spin_lock_init(&state[bank].lock);
-}
-EXPORT_SYMBOL_NS_GPL(i8255_state_init, I8255);
 
 /**
  * devm_i8255_regmap_register - Register an i8255 GPIO controller

drivers/gpio/gpio-i8255.h

···
 #ifndef _I8255_H_
 #define _I8255_H_
 
-#include <linux/spinlock.h>
-#include <linux/types.h>
-
-/**
- * struct i8255 - Intel 8255 register structure
- * @port:	Port A, B, and C
- * @control:	Control register
- */
-struct i8255 {
-	u8 port[3];
-	u8 control;
-};
-
-/**
- * struct i8255_state - Intel 8255 state structure
- * @lock:		synchronization lock for accessing device state
- * @control_state:	Control register state
- */
-struct i8255_state {
-	spinlock_t lock;
-	u8 control_state;
-};
-
 struct device;
 struct irq_domain;
 struct regmap;
···
 
 int devm_i8255_regmap_register(struct device *dev,
 			       const struct i8255_regmap_config *config);
-
-void i8255_direction_input(struct i8255 __iomem *ppi, struct i8255_state *state,
-			   unsigned long offset);
-void i8255_direction_output(struct i8255 __iomem *ppi,
-			    struct i8255_state *state, unsigned long offset,
-			    unsigned long value);
-int i8255_get(struct i8255 __iomem *ppi, unsigned long offset);
-int i8255_get_direction(const struct i8255_state *state, unsigned long offset);
-void i8255_get_multiple(struct i8255 __iomem *ppi, const unsigned long *mask,
-			unsigned long *bits, unsigned long ngpio);
-void i8255_mode0_output(struct i8255 __iomem *const ppi);
-void i8255_set(struct i8255 __iomem *ppi, struct i8255_state *state,
-	       unsigned long offset, unsigned long value);
-void i8255_set_multiple(struct i8255 __iomem *ppi, struct i8255_state *state,
-			const unsigned long *mask, const unsigned long *bits,
-			unsigned long ngpio);
-void i8255_state_init(struct i8255_state *const state, unsigned long nbanks);
 
 #endif /* _I8255_H_ */