1 /*
2  * Pinctrl driver for the Wondermedia SoC's
3  *
4  * Copyright (c) 2013 Tony Prisk <linux@prisktech.co.nz>
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms and conditions of the GNU General Public License,
8  * version 2, as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope it will be useful, but WITHOUT
11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
13  * more details.
14  */
15 
16 #include <linux/gpio.h>
17 
18 /* VT8500 has no enable register in the extgpio bank. */
19 #define NO_REG	0xFFFF
20 
21 #define WMT_PINCTRL_BANK(__en, __dir, __dout, __din, __pen, __pcfg)	\
22 {									\
23 	.reg_en		= __en,						\
24 	.reg_dir	= __dir,					\
25 	.reg_data_out	= __dout,					\
26 	.reg_data_in	= __din,					\
27 	.reg_pull_en	= __pen,					\
28 	.reg_pull_cfg	= __pcfg,					\
29 }
30 
31 /* Encode/decode the bank/bit pairs into a pin value */
32 #define WMT_PIN(__bank, __offset)	((__bank << 5) | __offset)
33 #define WMT_BANK_FROM_PIN(__pin)	(__pin >> 5)
34 #define WMT_BIT_FROM_PIN(__pin)		(__pin & 0x1f)
35 
36 #define WMT_GROUP(__name, __data)		\
37 {						\
38 	.name = __name,				\
39 	.pins = __data,				\
40 	.npins = ARRAY_SIZE(__data),		\
41 }
42 
43 struct wmt_pinctrl_bank_registers {
44 	u32	reg_en;
45 	u32	reg_dir;
46 	u32	reg_data_out;
47 	u32	reg_data_in;
48 
49 	u32	reg_pull_en;
50 	u32	reg_pull_cfg;
51 };
52 
53 struct wmt_pinctrl_group {
54 	const char *name;
55 	const unsigned int *pins;
56 	const unsigned npins;
57 };
58 
59 struct wmt_pinctrl_data {
60 	struct device *dev;
61 	struct pinctrl_dev *pctl_dev;
62 
63 	/* must be initialized before calling wmt_pinctrl_probe */
64 	void __iomem *base;
65 	const struct wmt_pinctrl_bank_registers *banks;
66 	const struct pinctrl_pin_desc *pins;
67 	const char * const *groups;
68 
69 	u32 nbanks;
70 	u32 npins;
71 	u32 ngroups;
72 
73 	struct gpio_chip gpio_chip;
74 	struct pinctrl_gpio_range gpio_range;
75 };
76 
77 int wmt_pinctrl_probe(struct platform_device *pdev,
78 		      struct wmt_pinctrl_data *data);
79