94ce944bed
This structure is not intended to be modified at runtime and functions as constant data shared between multiple pin banks. This patch makes all instances of it constant across the driver. Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
250 lines
8.1 KiB
C
250 lines
8.1 KiB
C
/*
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* pin-controller/pin-mux/pin-config/gpio-driver for Samsung's SoC's.
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*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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* Copyright (c) 2012 Linaro Ltd
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* http://www.linaro.org
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*
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* Author: Thomas Abraham <thomas.ab@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef __PINCTRL_SAMSUNG_H
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#define __PINCTRL_SAMSUNG_H
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#include <linux/pinctrl/pinctrl.h>
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#include <linux/pinctrl/pinmux.h>
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#include <linux/pinctrl/pinconf.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/pinctrl/machine.h>
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#include <linux/gpio.h>
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/* pinmux function number for pin as gpio output line */
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#define FUNC_INPUT 0x0
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#define FUNC_OUTPUT 0x1
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/**
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* enum pincfg_type - possible pin configuration types supported.
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* @PINCFG_TYPE_FUNC: Function configuration.
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* @PINCFG_TYPE_DAT: Pin value configuration.
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* @PINCFG_TYPE_PUD: Pull up/down configuration.
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* @PINCFG_TYPE_DRV: Drive strength configuration.
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* @PINCFG_TYPE_CON_PDN: Pin function in power down mode.
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* @PINCFG_TYPE_PUD_PDN: Pull up/down configuration in power down mode.
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*/
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enum pincfg_type {
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PINCFG_TYPE_FUNC,
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PINCFG_TYPE_DAT,
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PINCFG_TYPE_PUD,
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PINCFG_TYPE_DRV,
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PINCFG_TYPE_CON_PDN,
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PINCFG_TYPE_PUD_PDN,
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PINCFG_TYPE_NUM
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};
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/*
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* pin configuration (pull up/down and drive strength) type and its value are
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* packed together into a 16-bits. The upper 8-bits represent the configuration
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* type and the lower 8-bits hold the value of the configuration type.
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*/
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#define PINCFG_TYPE_MASK 0xFF
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#define PINCFG_VALUE_SHIFT 8
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#define PINCFG_VALUE_MASK (0xFF << PINCFG_VALUE_SHIFT)
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#define PINCFG_PACK(type, value) (((value) << PINCFG_VALUE_SHIFT) | type)
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#define PINCFG_UNPACK_TYPE(cfg) ((cfg) & PINCFG_TYPE_MASK)
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#define PINCFG_UNPACK_VALUE(cfg) (((cfg) & PINCFG_VALUE_MASK) >> \
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PINCFG_VALUE_SHIFT)
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/**
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* enum eint_type - possible external interrupt types.
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* @EINT_TYPE_NONE: bank does not support external interrupts
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* @EINT_TYPE_GPIO: bank supportes external gpio interrupts
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* @EINT_TYPE_WKUP: bank supportes external wakeup interrupts
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* @EINT_TYPE_WKUP_MUX: bank supports multiplexed external wakeup interrupts
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*
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* Samsung GPIO controller groups all the available pins into banks. The pins
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* in a pin bank can support external gpio interrupts or external wakeup
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* interrupts or no interrupts at all. From a software perspective, the only
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* difference between external gpio and external wakeup interrupts is that
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* the wakeup interrupts can additionally wakeup the system if it is in
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* suspended state.
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*/
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enum eint_type {
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EINT_TYPE_NONE,
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EINT_TYPE_GPIO,
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EINT_TYPE_WKUP,
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EINT_TYPE_WKUP_MUX,
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};
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/* maximum length of a pin in pin descriptor (example: "gpa0-0") */
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#define PIN_NAME_LENGTH 10
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#define PIN_GROUP(n, p, f) \
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{ \
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.name = n, \
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.pins = p, \
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.num_pins = ARRAY_SIZE(p), \
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.func = f \
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}
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#define PMX_FUNC(n, g) \
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{ \
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.name = n, \
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.groups = g, \
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.num_groups = ARRAY_SIZE(g), \
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}
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struct samsung_pinctrl_drv_data;
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/**
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* struct samsung_pin_bank_type: pin bank type description
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* @fld_width: widths of configuration bitfields (0 if unavailable)
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* @reg_offset: offsets of configuration registers (don't care of width is 0)
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*/
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struct samsung_pin_bank_type {
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u8 fld_width[PINCFG_TYPE_NUM];
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u8 reg_offset[PINCFG_TYPE_NUM];
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};
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/**
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* struct samsung_pin_bank: represent a controller pin-bank.
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* @type: type of the bank (register offsets and bitfield widths)
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* @pctl_offset: starting offset of the pin-bank registers.
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* @pin_base: starting pin number of the bank.
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* @nr_pins: number of pins included in this bank.
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* @eint_func: function to set in CON register to configure pin as EINT.
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* @eint_type: type of the external interrupt supported by the bank.
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* @eint_mask: bit mask of pins which support EINT function.
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* @name: name to be prefixed for each pin in this pin bank.
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* @of_node: OF node of the bank.
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* @drvdata: link to controller driver data
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* @irq_domain: IRQ domain of the bank.
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* @gpio_chip: GPIO chip of the bank.
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* @grange: linux gpio pin range supported by this bank.
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* @slock: spinlock protecting bank registers
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* @pm_save: saved register values during suspend
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*/
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struct samsung_pin_bank {
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const struct samsung_pin_bank_type *type;
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u32 pctl_offset;
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u32 pin_base;
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u8 nr_pins;
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u8 eint_func;
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enum eint_type eint_type;
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u32 eint_mask;
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u32 eint_offset;
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char *name;
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void *soc_priv;
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struct device_node *of_node;
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struct samsung_pinctrl_drv_data *drvdata;
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struct irq_domain *irq_domain;
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struct gpio_chip gpio_chip;
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struct pinctrl_gpio_range grange;
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spinlock_t slock;
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u32 pm_save[PINCFG_TYPE_NUM + 1]; /* +1 to handle double CON registers*/
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};
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/**
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* struct samsung_pin_ctrl: represent a pin controller.
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* @pin_banks: list of pin banks included in this controller.
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* @nr_banks: number of pin banks.
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* @base: starting system wide pin number.
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* @nr_pins: number of pins supported by the controller.
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* @eint_gpio_init: platform specific callback to setup the external gpio
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* interrupts for the controller.
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* @eint_wkup_init: platform specific callback to setup the external wakeup
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* interrupts for the controller.
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*/
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struct samsung_pin_ctrl {
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struct samsung_pin_bank *pin_banks;
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u32 nr_banks;
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u32 base;
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u32 nr_pins;
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int (*eint_gpio_init)(struct samsung_pinctrl_drv_data *);
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int (*eint_wkup_init)(struct samsung_pinctrl_drv_data *);
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void (*suspend)(struct samsung_pinctrl_drv_data *);
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void (*resume)(struct samsung_pinctrl_drv_data *);
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};
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/**
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* struct samsung_pinctrl_drv_data: wrapper for holding driver data together.
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* @node: global list node
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* @virt_base: register base address of the controller.
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* @dev: device instance representing the controller.
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* @irq: interrpt number used by the controller to notify gpio interrupts.
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* @ctrl: pin controller instance managed by the driver.
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* @pctl: pin controller descriptor registered with the pinctrl subsystem.
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* @pctl_dev: cookie representing pinctrl device instance.
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* @pin_groups: list of pin groups available to the driver.
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* @nr_groups: number of such pin groups.
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* @pmx_functions: list of pin functions available to the driver.
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* @nr_function: number of such pin functions.
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*/
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struct samsung_pinctrl_drv_data {
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struct list_head node;
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void __iomem *virt_base;
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struct device *dev;
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int irq;
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struct samsung_pin_ctrl *ctrl;
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struct pinctrl_desc pctl;
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struct pinctrl_dev *pctl_dev;
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const struct samsung_pin_group *pin_groups;
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unsigned int nr_groups;
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const struct samsung_pmx_func *pmx_functions;
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unsigned int nr_functions;
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};
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/**
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* struct samsung_pin_group: represent group of pins of a pinmux function.
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* @name: name of the pin group, used to lookup the group.
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* @pins: the pins included in this group.
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* @num_pins: number of pins included in this group.
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* @func: the function number to be programmed when selected.
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*/
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struct samsung_pin_group {
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const char *name;
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const unsigned int *pins;
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u8 num_pins;
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u8 func;
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};
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/**
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* struct samsung_pmx_func: represent a pin function.
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* @name: name of the pin function, used to lookup the function.
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* @groups: one or more names of pin groups that provide this function.
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* @num_groups: number of groups included in @groups.
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*/
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struct samsung_pmx_func {
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const char *name;
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const char **groups;
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u8 num_groups;
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u32 val;
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};
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/* list of all exported SoC specific data */
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extern struct samsung_pin_ctrl exynos3250_pin_ctrl[];
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extern struct samsung_pin_ctrl exynos4210_pin_ctrl[];
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extern struct samsung_pin_ctrl exynos4x12_pin_ctrl[];
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extern struct samsung_pin_ctrl exynos5250_pin_ctrl[];
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extern struct samsung_pin_ctrl exynos5260_pin_ctrl[];
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extern struct samsung_pin_ctrl exynos5420_pin_ctrl[];
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extern struct samsung_pin_ctrl s3c64xx_pin_ctrl[];
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extern struct samsung_pin_ctrl s3c2412_pin_ctrl[];
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extern struct samsung_pin_ctrl s3c2416_pin_ctrl[];
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extern struct samsung_pin_ctrl s3c2440_pin_ctrl[];
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extern struct samsung_pin_ctrl s3c2450_pin_ctrl[];
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extern struct samsung_pin_ctrl s5pv210_pin_ctrl[];
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#endif /* __PINCTRL_SAMSUNG_H */
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