/* * 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 * * 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 #include #include #include #include #include /** * enum pincfg_type - possible pin configuration types supported. * @PINCFG_TYPE_FUNC: Function configuration. * @PINCFG_TYPE_DAT: Pin value configuration. * @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_FUNC, PINCFG_TYPE_DAT, PINCFG_TYPE_PUD, PINCFG_TYPE_DRV, PINCFG_TYPE_CON_PDN, PINCFG_TYPE_PUD_PDN, PINCFG_TYPE_NUM }; /* * 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_type: pin bank type description * @fld_width: widths of configuration bitfields (0 if unavailable) * @reg_offset: offsets of configuration registers (don't care of width is 0) */ struct samsung_pin_bank_type { u8 fld_width[PINCFG_TYPE_NUM]; u8 reg_offset[PINCFG_TYPE_NUM]; }; /** * struct samsung_pin_bank_data: represent a controller pin-bank (init data). * @type: type of the bank (register offsets and bitfield widths) * @pctl_offset: starting offset of the pin-bank registers. * @pctl_res_idx: index of base address for pin-bank registers. * @nr_pins: number of pins included in this bank. * @eint_func: function to set in CON register to configure pin as EINT. * @eint_type: type of the external interrupt supported by the bank. * @eint_mask: bit mask of pins which support EINT function. * @eint_offset: SoC-specific EINT register or interrupt offset of bank. * @name: name to be prefixed for each pin in this pin bank. */ struct samsung_pin_bank_data { const struct samsung_pin_bank_type *type; u32 pctl_offset; u8 pctl_res_idx; u8 nr_pins; u8 eint_func; enum eint_type eint_type; u32 eint_mask; u32 eint_offset; const char *name; }; /** * struct samsung_pin_bank: represent a controller pin-bank. * @type: type of the bank (register offsets and bitfield widths) * @pctl_base: base address of the pin-bank registers * @pctl_offset: starting offset of the pin-bank registers. * @nr_pins: number of pins included in this bank. * @eint_base: base address of the pin-bank EINT registers. * @eint_func: function to set in CON register to configure pin as EINT. * @eint_type: type of the external interrupt supported by the bank. * @eint_mask: bit mask of pins which support EINT function. * @eint_offset: SoC-specific EINT register or interrupt offset of bank. * @name: name to be prefixed for each pin in this pin bank. * @pin_base: starting pin number of the bank. * @soc_priv: per-bank private data for SoC-specific code. * @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. * @irq_chip: link to irq chip for external gpio and wakeup interrupts. * @slock: spinlock protecting bank registers * @pm_save: saved register values during suspend */ struct samsung_pin_bank { const struct samsung_pin_bank_type *type; void __iomem *pctl_base; u32 pctl_offset; u8 nr_pins; void __iomem *eint_base; u8 eint_func; enum eint_type eint_type; u32 eint_mask; u32 eint_offset; const char *name; u32 pin_base; void *soc_priv; 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 exynos_irq_chip *irq_chip; spinlock_t slock; u32 pm_save[PINCFG_TYPE_NUM + 1]; /* +1 to handle double CON registers*/ }; /** * struct samsung_retention_data: runtime pin-bank retention control data. * @regs: array of PMU registers to control pad retention. * @nr_regs: number of registers in @regs array. * @value: value to store to registers to turn off retention. * @refcnt: atomic counter if retention control affects more than one bank. * @priv: retention control code private data * @enable: platform specific callback to enter retention mode. * @disable: platform specific callback to exit retention mode. **/ struct samsung_retention_ctrl { const u32 *regs; int nr_regs; u32 value; atomic_t *refcnt; void *priv; void (*enable)(struct samsung_pinctrl_drv_data *); void (*disable)(struct samsung_pinctrl_drv_data *); }; /** * struct samsung_retention_data: represent a pin-bank retention control data. * @regs: array of PMU registers to control pad retention. * @nr_regs: number of registers in @regs array. * @value: value to store to registers to turn off retention. * @refcnt: atomic counter if retention control affects more than one bank. * @init: platform specific callback to initialize retention control. **/ struct samsung_retention_data { const u32 *regs; int nr_regs; u32 value; atomic_t *refcnt; struct samsung_retention_ctrl *(*init)(struct samsung_pinctrl_drv_data *, const struct samsung_retention_data *); }; /** * struct samsung_pin_ctrl: represent a pin controller. * @pin_banks: list of pin banks included in this controller. * @nr_banks: number of pin banks. * @nr_ext_resources: number of the extra base address for pin banks. * @retention_data: configuration data for retention control. * @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. * @suspend: platform specific suspend callback, executed during pin controller * device suspend, see samsung_pinctrl_suspend() * @resume: platform specific resume callback, executed during pin controller * device suspend, see samsung_pinctrl_resume() * * External wakeup interrupts must define at least eint_wkup_init, * retention_data and suspend in order for proper suspend/resume to work. */ struct samsung_pin_ctrl { const struct samsung_pin_bank_data *pin_banks; unsigned int nr_banks; unsigned int nr_ext_resources; const struct samsung_retention_data *retention_data; int (*eint_gpio_init)(struct samsung_pinctrl_drv_data *); int (*eint_wkup_init)(struct samsung_pinctrl_drv_data *); void (*suspend)(struct samsung_pinctrl_drv_data *); void (*resume)(struct samsung_pinctrl_drv_data *); }; /** * struct samsung_pinctrl_drv_data: wrapper for holding driver data together. * @node: global list node * @virt_base: register base address of the controller; this will be equal * to each bank samsung_pin_bank->pctl_base and used on legacy * platforms (like S3C24XX or S3C64XX) which has to access the base * through samsung_pinctrl_drv_data, not samsung_pin_bank). * @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. * @pin_base: starting system wide pin number. * @nr_pins: number of pins supported by the controller. * @retention_ctrl: retention control runtime data. * @suspend: platform specific suspend callback, executed during pin controller * device suspend, see samsung_pinctrl_suspend() * @resume: platform specific resume callback, executed during pin controller * device suspend, see samsung_pinctrl_resume() */ struct samsung_pinctrl_drv_data { struct list_head node; void __iomem *virt_base; struct device *dev; int irq; 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_bank *pin_banks; unsigned int nr_banks; unsigned int pin_base; unsigned int nr_pins; struct samsung_retention_ctrl *retention_ctrl; void (*suspend)(struct samsung_pinctrl_drv_data *); void (*resume)(struct samsung_pinctrl_drv_data *); }; /** * struct samsung_pinctrl_of_match_data: OF match device specific configuration data. * @ctrl: array of pin controller data. * @num_ctrl: size of array @ctrl. */ struct samsung_pinctrl_of_match_data { const struct samsung_pin_ctrl *ctrl; unsigned int num_ctrl; }; /** * 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; u32 val; }; /* list of all exported SoC specific data */ extern const struct samsung_pinctrl_of_match_data exynos3250_of_data; extern const struct samsung_pinctrl_of_match_data exynos4210_of_data; extern const struct samsung_pinctrl_of_match_data exynos4x12_of_data; extern const struct samsung_pinctrl_of_match_data exynos5250_of_data; extern const struct samsung_pinctrl_of_match_data exynos5260_of_data; extern const struct samsung_pinctrl_of_match_data exynos5410_of_data; extern const struct samsung_pinctrl_of_match_data exynos5420_of_data; extern const struct samsung_pinctrl_of_match_data exynos5433_of_data; extern const struct samsung_pinctrl_of_match_data exynos7_of_data; extern const struct samsung_pinctrl_of_match_data s3c64xx_of_data; extern const struct samsung_pinctrl_of_match_data s3c2412_of_data; extern const struct samsung_pinctrl_of_match_data s3c2416_of_data; extern const struct samsung_pinctrl_of_match_data s3c2440_of_data; extern const struct samsung_pinctrl_of_match_data s3c2450_of_data; extern const struct samsung_pinctrl_of_match_data s5pv210_of_data; #endif /* __PINCTRL_SAMSUNG_H */