cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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serial_mctrl_gpio.h (3776B)

      1/* SPDX-License-Identifier: GPL-2.0+ */
      2/*
      3 * Helpers for controlling modem lines via GPIO
      4 *
      5 * Copyright (C) 2014 Paratronic S.A.
      6 */
      7
      8#ifndef __SERIAL_MCTRL_GPIO__
      9#define __SERIAL_MCTRL_GPIO__
     10
     11#include <linux/err.h>
     12#include <linux/device.h>
     13#include <linux/gpio/consumer.h>
     14
     15struct uart_port;
     16
     17enum mctrl_gpio_idx {
     18	UART_GPIO_CTS,
     19	UART_GPIO_DSR,
     20	UART_GPIO_DCD,
     21	UART_GPIO_RNG,
     22	UART_GPIO_RI = UART_GPIO_RNG,
     23	UART_GPIO_RTS,
     24	UART_GPIO_DTR,
     25	UART_GPIO_MAX,
     26};
     27
     28/*
     29 * Opaque descriptor for modem lines controlled by GPIOs
     30 */
     31struct mctrl_gpios;
     32
     33#ifdef CONFIG_GPIOLIB
     34
     35/*
     36 * Set state of the modem control output lines via GPIOs.
     37 */
     38void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl);
     39
     40/*
     41 * Get state of the modem control input lines from GPIOs.
     42 * The mctrl flags are updated and returned.
     43 */
     44unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl);
     45
     46/*
     47 * Get state of the modem control output lines from GPIOs.
     48 * The mctrl flags are updated and returned.
     49 */
     50unsigned int
     51mctrl_gpio_get_outputs(struct mctrl_gpios *gpios, unsigned int *mctrl);
     52
     53/*
     54 * Returns the associated struct gpio_desc to the modem line gidx
     55 */
     56struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios,
     57				      enum mctrl_gpio_idx gidx);
     58
     59/*
     60 * Request and set direction of modem control line GPIOs and set up irq
     61 * handling.
     62 * devm_* functions are used, so there's no need to call mctrl_gpio_free().
     63 * Returns a pointer to the allocated mctrl structure if ok, -ENOMEM on
     64 * allocation error.
     65 */
     66struct mctrl_gpios *mctrl_gpio_init(struct uart_port *port, unsigned int idx);
     67
     68/*
     69 * Request and set direction of modem control line GPIOs.
     70 * devm_* functions are used, so there's no need to call mctrl_gpio_free().
     71 * Returns a pointer to the allocated mctrl structure if ok, -ENOMEM on
     72 * allocation error.
     73 */
     74struct mctrl_gpios *mctrl_gpio_init_noauto(struct device *dev,
     75					   unsigned int idx);
     76
     77/*
     78 * Free the mctrl_gpios structure.
     79 * Normally, this function will not be called, as the GPIOs will
     80 * be disposed of by the resource management code.
     81 */
     82void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios);
     83
     84/*
     85 * Enable gpio interrupts to report status line changes.
     86 */
     87void mctrl_gpio_enable_ms(struct mctrl_gpios *gpios);
     88
     89/*
     90 * Disable gpio interrupts to report status line changes.
     91 */
     92void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios);
     93
     94/*
     95 * Enable gpio wakeup interrupts to enable wake up source.
     96 */
     97void mctrl_gpio_enable_irq_wake(struct mctrl_gpios *gpios);
     98
     99/*
    100 * Disable gpio wakeup interrupts to enable wake up source.
    101 */
    102void mctrl_gpio_disable_irq_wake(struct mctrl_gpios *gpios);
    103
    104#else /* GPIOLIB */
    105
    106static inline
    107void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
    108{
    109}
    110
    111static inline
    112unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl)
    113{
    114	return *mctrl;
    115}
    116
    117static inline unsigned int
    118mctrl_gpio_get_outputs(struct mctrl_gpios *gpios, unsigned int *mctrl)
    119{
    120	return *mctrl;
    121}
    122
    123static inline
    124struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios,
    125				      enum mctrl_gpio_idx gidx)
    126{
    127	return NULL;
    128}
    129
    130static inline
    131struct mctrl_gpios *mctrl_gpio_init(struct uart_port *port, unsigned int idx)
    132{
    133	return NULL;
    134}
    135
    136static inline
    137struct mctrl_gpios *mctrl_gpio_init_noauto(struct device *dev, unsigned int idx)
    138{
    139	return NULL;
    140}
    141
    142static inline
    143void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios)
    144{
    145}
    146
    147static inline void mctrl_gpio_enable_ms(struct mctrl_gpios *gpios)
    148{
    149}
    150
    151static inline void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios)
    152{
    153}
    154
    155static inline void mctrl_gpio_enable_irq_wake(struct mctrl_gpios *gpios)
    156{
    157}
    158
    159static inline void mctrl_gpio_disable_irq_wake(struct mctrl_gpios *gpios)
    160{
    161}
    162
    163#endif /* GPIOLIB */
    164
    165#endif