240 lines
7.5 KiB
C
240 lines
7.5 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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/* register offsets within a pin bank */
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#define DAT_REG 0x4
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#define PUD_REG 0x8
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#define DRV_REG 0xC
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#define CONPDN_REG 0x10
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#define PUDPDN_REG 0x14
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/* pinmux function number for pin as gpio output line */
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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_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_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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};
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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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*
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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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};
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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: represent a controller pin-bank.
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* @reg_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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* @func_width: width of the function selector bit field.
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* @pud_width: width of the pin pull up/down selector bit field.
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* @drv_width: width of the pin driver strength selector bit field.
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* @conpdn_width: width of the sleep mode function selector bin field.
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* @pudpdn_width: width of the sleep mode pull up/down selector bit field.
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* @eint_type: type of the external interrupt supported by the bank.
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* @irq_base: starting controller local irq number of the bank.
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* @name: name to be prefixed for each pin in this pin bank.
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*/
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struct samsung_pin_bank {
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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 func_width;
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u8 pud_width;
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u8 drv_width;
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u8 conpdn_width;
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u8 pudpdn_width;
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enum eint_type eint_type;
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u32 irq_base;
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char *name;
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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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* @nr_gint: number of external gpio interrupts supported.
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* @nr_wint: number of external wakeup interrupts supported.
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* @geint_con: offset of the ext-gpio controller registers.
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* @geint_mask: offset of the ext-gpio interrupt mask registers.
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* @geint_pend: offset of the ext-gpio interrupt pending registers.
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* @weint_con: offset of the ext-wakeup controller registers.
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* @weint_mask: offset of the ext-wakeup interrupt mask registers.
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* @weint_pend: offset of the ext-wakeup interrupt pending registers.
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* @svc: offset of the interrupt service register.
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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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* @label: for debug information.
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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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u32 nr_gint;
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u32 nr_wint;
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u32 geint_con;
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u32 geint_mask;
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u32 geint_pend;
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u32 weint_con;
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u32 weint_mask;
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u32 weint_pend;
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u32 svc;
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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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char *label;
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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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* @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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* @gc: gpio_chip instance registered with gpiolib.
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* @grange: linux gpio pin range supported by this controller.
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*/
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struct samsung_pinctrl_drv_data {
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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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struct irq_domain *gpio_irqd;
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struct irq_domain *wkup_irqd;
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struct gpio_chip *gc;
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struct pinctrl_gpio_range grange;
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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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};
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/* list of all exported SoC specific data */
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extern struct samsung_pin_ctrl exynos4210_pin_ctrl[];
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#endif /* __PINCTRL_SAMSUNG_H */
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