1/* SPDX-License-Identifier: GPL-2.0+ */ 2/* 3 * pin-controller/pin-mux/pin-config/gpio-driver for Samsung's SoC's. 4 * 5 * Copyright (c) 2012 Samsung Electronics Co., Ltd. 6 * http://www.samsung.com 7 * Copyright (c) 2012 Linaro Ltd 8 * http://www.linaro.org 9 * 10 * Author: Thomas Abraham <thomas.ab@samsung.com> 11 */ 12 13#ifndef __PINCTRL_SAMSUNG_H 14#define __PINCTRL_SAMSUNG_H 15 16#include <linux/pinctrl/pinctrl.h> 17#include <linux/pinctrl/pinmux.h> 18#include <linux/pinctrl/pinconf.h> 19#include <linux/pinctrl/consumer.h> 20#include <linux/pinctrl/machine.h> 21 22#include <linux/gpio/driver.h> 23 24/** 25 * enum pincfg_type - possible pin configuration types supported. 26 * @PINCFG_TYPE_FUNC: Function configuration. 27 * @PINCFG_TYPE_DAT: Pin value configuration. 28 * @PINCFG_TYPE_PUD: Pull up/down configuration. 29 * @PINCFG_TYPE_DRV: Drive strength configuration. 30 * @PINCFG_TYPE_CON_PDN: Pin function in power down mode. 31 * @PINCFG_TYPE_PUD_PDN: Pull up/down configuration in power down mode. 32 */ 33enum pincfg_type { 34 PINCFG_TYPE_FUNC, 35 PINCFG_TYPE_DAT, 36 PINCFG_TYPE_PUD, 37 PINCFG_TYPE_DRV, 38 PINCFG_TYPE_CON_PDN, 39 PINCFG_TYPE_PUD_PDN, 40 41 PINCFG_TYPE_NUM 42}; 43 44/* 45 * pin configuration (pull up/down and drive strength) type and its value are 46 * packed together into a 16-bits. The upper 8-bits represent the configuration 47 * type and the lower 8-bits hold the value of the configuration type. 48 */ 49#define PINCFG_TYPE_MASK 0xFF 50#define PINCFG_VALUE_SHIFT 8 51#define PINCFG_VALUE_MASK (0xFF << PINCFG_VALUE_SHIFT) 52#define PINCFG_PACK(type, value) (((value) << PINCFG_VALUE_SHIFT) | type) 53#define PINCFG_UNPACK_TYPE(cfg) ((cfg) & PINCFG_TYPE_MASK) 54#define PINCFG_UNPACK_VALUE(cfg) (((cfg) & PINCFG_VALUE_MASK) >> \ 55 PINCFG_VALUE_SHIFT) 56/** 57 * enum eint_type - possible external interrupt types. 58 * @EINT_TYPE_NONE: bank does not support external interrupts 59 * @EINT_TYPE_GPIO: bank supportes external gpio interrupts 60 * @EINT_TYPE_WKUP: bank supportes external wakeup interrupts 61 * @EINT_TYPE_WKUP_MUX: bank supports multiplexed external wakeup interrupts 62 * 63 * Samsung GPIO controller groups all the available pins into banks. The pins 64 * in a pin bank can support external gpio interrupts or external wakeup 65 * interrupts or no interrupts at all. From a software perspective, the only 66 * difference between external gpio and external wakeup interrupts is that 67 * the wakeup interrupts can additionally wakeup the system if it is in 68 * suspended state. 69 */ 70enum eint_type { 71 EINT_TYPE_NONE, 72 EINT_TYPE_GPIO, 73 EINT_TYPE_WKUP, 74 EINT_TYPE_WKUP_MUX, 75}; 76 77/* maximum length of a pin in pin descriptor (example: "gpa0-0") */ 78#define PIN_NAME_LENGTH 10 79 80#define PIN_GROUP(n, p, f) \ 81 { \ 82 .name = n, \ 83 .pins = p, \ 84 .num_pins = ARRAY_SIZE(p), \ 85 .func = f \ 86 } 87 88#define PMX_FUNC(n, g) \ 89 { \ 90 .name = n, \ 91 .groups = g, \ 92 .num_groups = ARRAY_SIZE(g), \ 93 } 94 95struct samsung_pinctrl_drv_data; 96 97/** 98 * struct samsung_pin_bank_type: pin bank type description 99 * @fld_width: widths of configuration bitfields (0 if unavailable) 100 * @reg_offset: offsets of configuration registers (don't care of width is 0) 101 */ 102struct samsung_pin_bank_type { 103 u8 fld_width[PINCFG_TYPE_NUM]; 104 u8 reg_offset[PINCFG_TYPE_NUM]; 105}; 106 107/** 108 * struct samsung_pin_bank_data: represent a controller pin-bank (init data). 109 * @type: type of the bank (register offsets and bitfield widths) 110 * @pctl_offset: starting offset of the pin-bank registers. 111 * @pctl_res_idx: index of base address for pin-bank registers. 112 * @nr_pins: number of pins included in this bank. 113 * @eint_func: function to set in CON register to configure pin as EINT. 114 * @eint_type: type of the external interrupt supported by the bank. 115 * @eint_mask: bit mask of pins which support EINT function. 116 * @eint_offset: SoC-specific EINT register or interrupt offset of bank. 117 * @name: name to be prefixed for each pin in this pin bank. 118 */ 119struct samsung_pin_bank_data { 120 const struct samsung_pin_bank_type *type; 121 u32 pctl_offset; 122 u8 pctl_res_idx; 123 u8 nr_pins; 124 u8 eint_func; 125 enum eint_type eint_type; 126 u32 eint_mask; 127 u32 eint_offset; 128 const char *name; 129}; 130 131/** 132 * struct samsung_pin_bank: represent a controller pin-bank. 133 * @type: type of the bank (register offsets and bitfield widths) 134 * @pctl_base: base address of the pin-bank registers 135 * @pctl_offset: starting offset of the pin-bank registers. 136 * @nr_pins: number of pins included in this bank. 137 * @eint_base: base address of the pin-bank EINT registers. 138 * @eint_func: function to set in CON register to configure pin as EINT. 139 * @eint_type: type of the external interrupt supported by the bank. 140 * @eint_mask: bit mask of pins which support EINT function. 141 * @eint_offset: SoC-specific EINT register or interrupt offset of bank. 142 * @name: name to be prefixed for each pin in this pin bank. 143 * @pin_base: starting pin number of the bank. 144 * @soc_priv: per-bank private data for SoC-specific code. 145 * @of_node: OF node of the bank. 146 * @drvdata: link to controller driver data 147 * @irq_domain: IRQ domain of the bank. 148 * @gpio_chip: GPIO chip of the bank. 149 * @grange: linux gpio pin range supported by this bank. 150 * @irq_chip: link to irq chip for external gpio and wakeup interrupts. 151 * @slock: spinlock protecting bank registers 152 * @pm_save: saved register values during suspend 153 */ 154struct samsung_pin_bank { 155 const struct samsung_pin_bank_type *type; 156 void __iomem *pctl_base; 157 u32 pctl_offset; 158 u8 nr_pins; 159 void __iomem *eint_base; 160 u8 eint_func; 161 enum eint_type eint_type; 162 u32 eint_mask; 163 u32 eint_offset; 164 const char *name; 165 166 u32 pin_base; 167 void *soc_priv; 168 struct device_node *of_node; 169 struct samsung_pinctrl_drv_data *drvdata; 170 struct irq_domain *irq_domain; 171 struct gpio_chip gpio_chip; 172 struct pinctrl_gpio_range grange; 173 struct exynos_irq_chip *irq_chip; 174 spinlock_t slock; 175 176 u32 pm_save[PINCFG_TYPE_NUM + 1]; /* +1 to handle double CON registers*/ 177}; 178 179/** 180 * struct samsung_retention_data: runtime pin-bank retention control data. 181 * @regs: array of PMU registers to control pad retention. 182 * @nr_regs: number of registers in @regs array. 183 * @value: value to store to registers to turn off retention. 184 * @refcnt: atomic counter if retention control affects more than one bank. 185 * @priv: retention control code private data 186 * @enable: platform specific callback to enter retention mode. 187 * @disable: platform specific callback to exit retention mode. 188 **/ 189struct samsung_retention_ctrl { 190 const u32 *regs; 191 int nr_regs; 192 u32 value; 193 atomic_t *refcnt; 194 void *priv; 195 void (*enable)(struct samsung_pinctrl_drv_data *); 196 void (*disable)(struct samsung_pinctrl_drv_data *); 197}; 198 199/** 200 * struct samsung_retention_data: represent a pin-bank retention control data. 201 * @regs: array of PMU registers to control pad retention. 202 * @nr_regs: number of registers in @regs array. 203 * @value: value to store to registers to turn off retention. 204 * @refcnt: atomic counter if retention control affects more than one bank. 205 * @init: platform specific callback to initialize retention control. 206 **/ 207struct samsung_retention_data { 208 const u32 *regs; 209 int nr_regs; 210 u32 value; 211 atomic_t *refcnt; 212 struct samsung_retention_ctrl *(*init)(struct samsung_pinctrl_drv_data *, 213 const struct samsung_retention_data *); 214}; 215 216/** 217 * struct samsung_pin_ctrl: represent a pin controller. 218 * @pin_banks: list of pin banks included in this controller. 219 * @nr_banks: number of pin banks. 220 * @nr_ext_resources: number of the extra base address for pin banks. 221 * @retention_data: configuration data for retention control. 222 * @eint_gpio_init: platform specific callback to setup the external gpio 223 * interrupts for the controller. 224 * @eint_wkup_init: platform specific callback to setup the external wakeup 225 * interrupts for the controller. 226 * @suspend: platform specific suspend callback, executed during pin controller 227 * device suspend, see samsung_pinctrl_suspend() 228 * @resume: platform specific resume callback, executed during pin controller 229 * device suspend, see samsung_pinctrl_resume() 230 * 231 * External wakeup interrupts must define at least eint_wkup_init, 232 * retention_data and suspend in order for proper suspend/resume to work. 233 */ 234struct samsung_pin_ctrl { 235 const struct samsung_pin_bank_data *pin_banks; 236 unsigned int nr_banks; 237 unsigned int nr_ext_resources; 238 const struct samsung_retention_data *retention_data; 239 240 int (*eint_gpio_init)(struct samsung_pinctrl_drv_data *); 241 int (*eint_wkup_init)(struct samsung_pinctrl_drv_data *); 242 void (*suspend)(struct samsung_pinctrl_drv_data *); 243 void (*resume)(struct samsung_pinctrl_drv_data *); 244}; 245 246/** 247 * struct samsung_pinctrl_drv_data: wrapper for holding driver data together. 248 * @node: global list node 249 * @virt_base: register base address of the controller; this will be equal 250 * to each bank samsung_pin_bank->pctl_base and used on legacy 251 * platforms (like S3C24XX or S3C64XX) which has to access the base 252 * through samsung_pinctrl_drv_data, not samsung_pin_bank). 253 * @dev: device instance representing the controller. 254 * @irq: interrpt number used by the controller to notify gpio interrupts. 255 * @ctrl: pin controller instance managed by the driver. 256 * @pctl: pin controller descriptor registered with the pinctrl subsystem. 257 * @pctl_dev: cookie representing pinctrl device instance. 258 * @pin_groups: list of pin groups available to the driver. 259 * @nr_groups: number of such pin groups. 260 * @pmx_functions: list of pin functions available to the driver. 261 * @nr_function: number of such pin functions. 262 * @pin_base: starting system wide pin number. 263 * @nr_pins: number of pins supported by the controller. 264 * @retention_ctrl: retention control runtime data. 265 * @suspend: platform specific suspend callback, executed during pin controller 266 * device suspend, see samsung_pinctrl_suspend() 267 * @resume: platform specific resume callback, executed during pin controller 268 * device suspend, see samsung_pinctrl_resume() 269 */ 270struct samsung_pinctrl_drv_data { 271 struct list_head node; 272 void __iomem *virt_base; 273 struct device *dev; 274 int irq; 275 276 struct pinctrl_desc pctl; 277 struct pinctrl_dev *pctl_dev; 278 279 const struct samsung_pin_group *pin_groups; 280 unsigned int nr_groups; 281 const struct samsung_pmx_func *pmx_functions; 282 unsigned int nr_functions; 283 284 struct samsung_pin_bank *pin_banks; 285 unsigned int nr_banks; 286 unsigned int pin_base; 287 unsigned int nr_pins; 288 289 struct samsung_retention_ctrl *retention_ctrl; 290 291 void (*suspend)(struct samsung_pinctrl_drv_data *); 292 void (*resume)(struct samsung_pinctrl_drv_data *); 293}; 294 295/** 296 * struct samsung_pinctrl_of_match_data: OF match device specific configuration data. 297 * @ctrl: array of pin controller data. 298 * @num_ctrl: size of array @ctrl. 299 */ 300struct samsung_pinctrl_of_match_data { 301 const struct samsung_pin_ctrl *ctrl; 302 unsigned int num_ctrl; 303}; 304 305/** 306 * struct samsung_pin_group: represent group of pins of a pinmux function. 307 * @name: name of the pin group, used to lookup the group. 308 * @pins: the pins included in this group. 309 * @num_pins: number of pins included in this group. 310 * @func: the function number to be programmed when selected. 311 */ 312struct samsung_pin_group { 313 const char *name; 314 const unsigned int *pins; 315 u8 num_pins; 316 u8 func; 317}; 318 319/** 320 * struct samsung_pmx_func: represent a pin function. 321 * @name: name of the pin function, used to lookup the function. 322 * @groups: one or more names of pin groups that provide this function. 323 * @num_groups: number of groups included in @groups. 324 */ 325struct samsung_pmx_func { 326 const char *name; 327 const char **groups; 328 u8 num_groups; 329 u32 val; 330}; 331 332/* list of all exported SoC specific data */ 333extern const struct samsung_pinctrl_of_match_data exynos3250_of_data; 334extern const struct samsung_pinctrl_of_match_data exynos4210_of_data; 335extern const struct samsung_pinctrl_of_match_data exynos4x12_of_data; 336extern const struct samsung_pinctrl_of_match_data exynos5250_of_data; 337extern const struct samsung_pinctrl_of_match_data exynos5260_of_data; 338extern const struct samsung_pinctrl_of_match_data exynos5410_of_data; 339extern const struct samsung_pinctrl_of_match_data exynos5420_of_data; 340extern const struct samsung_pinctrl_of_match_data exynos5433_of_data; 341extern const struct samsung_pinctrl_of_match_data exynos7_of_data; 342extern const struct samsung_pinctrl_of_match_data s3c64xx_of_data; 343extern const struct samsung_pinctrl_of_match_data s3c2412_of_data; 344extern const struct samsung_pinctrl_of_match_data s3c2416_of_data; 345extern const struct samsung_pinctrl_of_match_data s3c2440_of_data; 346extern const struct samsung_pinctrl_of_match_data s3c2450_of_data; 347extern const struct samsung_pinctrl_of_match_data s5pv210_of_data; 348 349#endif /* __PINCTRL_SAMSUNG_H */ 350