diff options
Diffstat (limited to 'drivers/pinctrl/pinctrl-samsung.h')
| -rw-r--r-- | drivers/pinctrl/pinctrl-samsung.h | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-samsung.h b/drivers/pinctrl/pinctrl-samsung.h new file mode 100644 index 000000000000..b8956934cda6 --- /dev/null +++ b/drivers/pinctrl/pinctrl-samsung.h @@ -0,0 +1,239 @@ +/* + * 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> + +/* 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 + * + * 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, +}; + +/* 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. + * @reg_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. + * @irq_base: starting controller local irq number of the bank. + * @name: name to be prefixed for each pin in this pin 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 irq_base; + char *name; +}; + +/** + * 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. + * @nr_gint: number of external gpio interrupts supported. + * @nr_wint: number of external wakeup interrupts supported. + * @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 nr_gint; + u32 nr_wint; + + 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. + * @gc: gpio_chip instance registered with gpiolib. + * @grange: linux gpio pin range supported by this controller. + */ +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 irq_domain *gpio_irqd; + struct irq_domain *wkup_irqd; + + struct gpio_chip *gc; + struct pinctrl_gpio_range grange; +}; + +/** + * 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[]; + +#endif /* __PINCTRL_SAMSUNG_H */ |