/* * pin-controller/pin-mux/pin-config/gpio-driver for Samsung's SoC's. * * Copyright (c) 2012 Samsung Electronics Co., Ltd. * http://www.samsung.com * Copyright (c) 2012 Linaro Ltd * http://www.linaro.org * * Author: Thomas Abraham <thomas.ab@samsung.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #ifndef __PINCTRL_SAMSUNG_H #define __PINCTRL_SAMSUNG_H #include <linux/pinctrl/pinctrl.h> #include <linux/pinctrl/pinmux.h> #include <linux/pinctrl/pinconf.h> #include <linux/pinctrl/consumer.h> #include <linux/pinctrl/machine.h> #include <linux/gpio.h> /* register offsets within a pin bank */ #define DAT_REG 0x4 #define PUD_REG 0x8 #define DRV_REG 0xC #define CONPDN_REG 0x10 #define PUDPDN_REG 0x14 /* pinmux function number for pin as gpio output line */ #define FUNC_OUTPUT 0x1 /** * enum pincfg_type - possible pin configuration types supported. * @PINCFG_TYPE_PUD: Pull up/down configuration. * @PINCFG_TYPE_DRV: Drive strength configuration. * @PINCFG_TYPE_CON_PDN: Pin function in power down mode. * @PINCFG_TYPE_PUD_PDN: Pull up/down configuration in power down mode. */ enum pincfg_type { PINCFG_TYPE_PUD, PINCFG_TYPE_DRV, PINCFG_TYPE_CON_PDN, PINCFG_TYPE_PUD_PDN, }; /* * pin configuration (pull up/down and drive strength) type and its value are * packed together into a 16-bits. The upper 8-bits represent the configuration * type and the lower 8-bits hold the value of the configuration type. */ #define PINCFG_TYPE_MASK 0xFF #define PINCFG_VALUE_SHIFT 8 #define PINCFG_VALUE_MASK (0xFF << PINCFG_VALUE_SHIFT) #define PINCFG_PACK(type, value) (((value) << PINCFG_VALUE_SHIFT) | type) #define PINCFG_UNPACK_TYPE(cfg) ((cfg) & PINCFG_TYPE_MASK) #define PINCFG_UNPACK_VALUE(cfg) (((cfg) & PINCFG_VALUE_MASK) >> \ PINCFG_VALUE_SHIFT) /** * enum eint_type - possible external interrupt types. * @EINT_TYPE_NONE: bank does not support external interrupts * @EINT_TYPE_GPIO: bank supportes external gpio interrupts * @EINT_TYPE_WKUP: bank supportes external wakeup interrupts * @EINT_TYPE_WKUP_MUX: bank supports multiplexed external wakeup interrupts * * Samsung GPIO controller groups all the available pins into banks. The pins * in a pin bank can support external gpio interrupts or external wakeup * interrupts or no interrupts at all. From a software perspective, the only * difference between external gpio and external wakeup interrupts is that * the wakeup interrupts can additionally wakeup the system if it is in * suspended state. */ enum eint_type { EINT_TYPE_NONE, EINT_TYPE_GPIO, EINT_TYPE_WKUP, EINT_TYPE_WKUP_MUX, }; /* maximum length of a pin in pin descriptor (example: "gpa0-0") */ #define PIN_NAME_LENGTH 10 #define PIN_GROUP(n, p, f) \ { \ .name = n, \ .pins = p, \ .num_pins = ARRAY_SIZE(p), \ .func = f \ } #define PMX_FUNC(n, g) \ { \ .name = n, \ .groups = g, \ .num_groups = ARRAY_SIZE(g), \ } struct samsung_pinctrl_drv_data; /** * struct samsung_pin_bank: represent a controller pin-bank. * @pctl_offset: starting offset of the pin-bank registers. * @pin_base: starting pin number of the bank. * @nr_pins: number of pins included in this bank. * @func_width: width of the function selector bit field. * @pud_width: width of the pin pull up/down selector bit field. * @drv_width: width of the pin driver strength selector bit field. * @conpdn_width: width of the sleep mode function selector bin field. * @pudpdn_width: width of the sleep mode pull up/down selector bit field. * @eint_type: type of the external interrupt supported by the bank. * @name: name to be prefixed for each pin in this pin bank. * @of_node: OF node of the bank. * @drvdata: link to controller driver data * @irq_domain: IRQ domain of the bank. * @gpio_chip: GPIO chip of the bank. * @grange: linux gpio pin range supported by this bank. */ struct samsung_pin_bank { u32 pctl_offset; u32 pin_base; u8 nr_pins; u8 func_width; u8 pud_width; u8 drv_width; u8 conpdn_width; u8 pudpdn_width; enum eint_type eint_type; u32 eint_offset; char *name; struct device_node *of_node; struct samsung_pinctrl_drv_data *drvdata; struct irq_domain *irq_domain; struct gpio_chip gpio_chip; struct pinctrl_gpio_range grange; }; /** * struct samsung_pin_ctrl: represent a pin controller. * @pin_banks: list of pin banks included in this controller. * @nr_banks: number of pin banks. * @base: starting system wide pin number. * @nr_pins: number of pins supported by the controller. * @geint_con: offset of the ext-gpio controller registers. * @geint_mask: offset of the ext-gpio interrupt mask registers. * @geint_pend: offset of the ext-gpio interrupt pending registers. * @weint_con: offset of the ext-wakeup controller registers. * @weint_mask: offset of the ext-wakeup interrupt mask registers. * @weint_pend: offset of the ext-wakeup interrupt pending registers. * @svc: offset of the interrupt service register. * @eint_gpio_init: platform specific callback to setup the external gpio * interrupts for the controller. * @eint_wkup_init: platform specific callback to setup the external wakeup * interrupts for the controller. * @label: for debug information. */ struct samsung_pin_ctrl { struct samsung_pin_bank *pin_banks; u32 nr_banks; u32 base; u32 nr_pins; u32 geint_con; u32 geint_mask; u32 geint_pend; u32 weint_con; u32 weint_mask; u32 weint_pend; u32 svc; int (*eint_gpio_init)(struct samsung_pinctrl_drv_data *); int (*eint_wkup_init)(struct samsung_pinctrl_drv_data *); char *label; }; /** * struct samsung_pinctrl_drv_data: wrapper for holding driver data together. * @virt_base: register base address of the controller. * @dev: device instance representing the controller. * @irq: interrpt number used by the controller to notify gpio interrupts. * @ctrl: pin controller instance managed by the driver. * @pctl: pin controller descriptor registered with the pinctrl subsystem. * @pctl_dev: cookie representing pinctrl device instance. * @pin_groups: list of pin groups available to the driver. * @nr_groups: number of such pin groups. * @pmx_functions: list of pin functions available to the driver. * @nr_function: number of such pin functions. */ struct samsung_pinctrl_drv_data { void __iomem *virt_base; struct device *dev; int irq; struct samsung_pin_ctrl *ctrl; struct pinctrl_desc pctl; struct pinctrl_dev *pctl_dev; const struct samsung_pin_group *pin_groups; unsigned int nr_groups; const struct samsung_pmx_func *pmx_functions; unsigned int nr_functions; }; /** * struct samsung_pin_group: represent group of pins of a pinmux function. * @name: name of the pin group, used to lookup the group. * @pins: the pins included in this group. * @num_pins: number of pins included in this group. * @func: the function number to be programmed when selected. */ struct samsung_pin_group { const char *name; const unsigned int *pins; u8 num_pins; u8 func; }; /** * struct samsung_pmx_func: represent a pin function. * @name: name of the pin function, used to lookup the function. * @groups: one or more names of pin groups that provide this function. * @num_groups: number of groups included in @groups. */ struct samsung_pmx_func { const char *name; const char **groups; u8 num_groups; }; /* list of all exported SoC specific data */ extern struct samsung_pin_ctrl exynos4210_pin_ctrl[]; extern struct samsung_pin_ctrl exynos4x12_pin_ctrl[]; #endif /* __PINCTRL_SAMSUNG_H */