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  */
33 enum 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  */
70 enum 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 
95 struct 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  */
102 struct 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  */
119 struct 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  */
154 struct 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 	raw_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  **/
189 struct 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  **/
207 struct 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  */
234 struct 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  */
270 struct 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  */
300 struct 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  */
312 struct 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  */
325 struct 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 */
333 extern const struct samsung_pinctrl_of_match_data exynos3250_of_data;
334 extern const struct samsung_pinctrl_of_match_data exynos4210_of_data;
335 extern const struct samsung_pinctrl_of_match_data exynos4x12_of_data;
336 extern const struct samsung_pinctrl_of_match_data exynos5250_of_data;
337 extern const struct samsung_pinctrl_of_match_data exynos5260_of_data;
338 extern const struct samsung_pinctrl_of_match_data exynos5410_of_data;
339 extern const struct samsung_pinctrl_of_match_data exynos5420_of_data;
340 extern const struct samsung_pinctrl_of_match_data exynos5433_of_data;
341 extern const struct samsung_pinctrl_of_match_data exynos7_of_data;
342 extern const struct samsung_pinctrl_of_match_data s3c64xx_of_data;
343 extern const struct samsung_pinctrl_of_match_data s3c2412_of_data;
344 extern const struct samsung_pinctrl_of_match_data s3c2416_of_data;
345 extern const struct samsung_pinctrl_of_match_data s3c2440_of_data;
346 extern const struct samsung_pinctrl_of_match_data s3c2450_of_data;
347 extern const struct samsung_pinctrl_of_match_data s5pv210_of_data;
348 
349 #endif /* __PINCTRL_SAMSUNG_H */
350