1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21#include <linux/init.h>
22#include <linux/export.h>
23#include <linux/gpio.h>
24
25#include <asm/mach-ar7/ar7.h>
26
27#define AR7_GPIO_MAX 32
28#define TITAN_GPIO_MAX 51
29
30struct ar7_gpio_chip {
31 void __iomem *regs;
32 struct gpio_chip chip;
33};
34
35static int ar7_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
36{
37 struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
38 void __iomem *gpio_in = gpch->regs + AR7_GPIO_INPUT;
39
40 return !!(readl(gpio_in) & (1 << gpio));
41}
42
43static int titan_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
44{
45 struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
46 void __iomem *gpio_in0 = gpch->regs + TITAN_GPIO_INPUT_0;
47 void __iomem *gpio_in1 = gpch->regs + TITAN_GPIO_INPUT_1;
48
49 return readl(gpio >> 5 ? gpio_in1 : gpio_in0) & (1 << (gpio & 0x1f));
50}
51
52static void ar7_gpio_set_value(struct gpio_chip *chip,
53 unsigned gpio, int value)
54{
55 struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
56 void __iomem *gpio_out = gpch->regs + AR7_GPIO_OUTPUT;
57 unsigned tmp;
58
59 tmp = readl(gpio_out) & ~(1 << gpio);
60 if (value)
61 tmp |= 1 << gpio;
62 writel(tmp, gpio_out);
63}
64
65static void titan_gpio_set_value(struct gpio_chip *chip,
66 unsigned gpio, int value)
67{
68 struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
69 void __iomem *gpio_out0 = gpch->regs + TITAN_GPIO_OUTPUT_0;
70 void __iomem *gpio_out1 = gpch->regs + TITAN_GPIO_OUTPUT_1;
71 unsigned tmp;
72
73 tmp = readl(gpio >> 5 ? gpio_out1 : gpio_out0) & ~(1 << (gpio & 0x1f));
74 if (value)
75 tmp |= 1 << (gpio & 0x1f);
76 writel(tmp, gpio >> 5 ? gpio_out1 : gpio_out0);
77}
78
79static int ar7_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
80{
81 struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
82 void __iomem *gpio_dir = gpch->regs + AR7_GPIO_DIR;
83
84 writel(readl(gpio_dir) | (1 << gpio), gpio_dir);
85
86 return 0;
87}
88
89static int titan_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
90{
91 struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
92 void __iomem *gpio_dir0 = gpch->regs + TITAN_GPIO_DIR_0;
93 void __iomem *gpio_dir1 = gpch->regs + TITAN_GPIO_DIR_1;
94
95 if (gpio >= TITAN_GPIO_MAX)
96 return -EINVAL;
97
98 writel(readl(gpio >> 5 ? gpio_dir1 : gpio_dir0) | (1 << (gpio & 0x1f)),
99 gpio >> 5 ? gpio_dir1 : gpio_dir0);
100 return 0;
101}
102
103static int ar7_gpio_direction_output(struct gpio_chip *chip,
104 unsigned gpio, int value)
105{
106 struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
107 void __iomem *gpio_dir = gpch->regs + AR7_GPIO_DIR;
108
109 ar7_gpio_set_value(chip, gpio, value);
110 writel(readl(gpio_dir) & ~(1 << gpio), gpio_dir);
111
112 return 0;
113}
114
115static int titan_gpio_direction_output(struct gpio_chip *chip,
116 unsigned gpio, int value)
117{
118 struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
119 void __iomem *gpio_dir0 = gpch->regs + TITAN_GPIO_DIR_0;
120 void __iomem *gpio_dir1 = gpch->regs + TITAN_GPIO_DIR_1;
121
122 if (gpio >= TITAN_GPIO_MAX)
123 return -EINVAL;
124
125 titan_gpio_set_value(chip, gpio, value);
126 writel(readl(gpio >> 5 ? gpio_dir1 : gpio_dir0) & ~(1 <<
127 (gpio & 0x1f)), gpio >> 5 ? gpio_dir1 : gpio_dir0);
128
129 return 0;
130}
131
132static struct ar7_gpio_chip ar7_gpio_chip = {
133 .chip = {
134 .label = "ar7-gpio",
135 .direction_input = ar7_gpio_direction_input,
136 .direction_output = ar7_gpio_direction_output,
137 .set = ar7_gpio_set_value,
138 .get = ar7_gpio_get_value,
139 .base = 0,
140 .ngpio = AR7_GPIO_MAX,
141 }
142};
143
144static struct ar7_gpio_chip titan_gpio_chip = {
145 .chip = {
146 .label = "titan-gpio",
147 .direction_input = titan_gpio_direction_input,
148 .direction_output = titan_gpio_direction_output,
149 .set = titan_gpio_set_value,
150 .get = titan_gpio_get_value,
151 .base = 0,
152 .ngpio = TITAN_GPIO_MAX,
153 }
154};
155
156static inline int ar7_gpio_enable_ar7(unsigned gpio)
157{
158 void __iomem *gpio_en = ar7_gpio_chip.regs + AR7_GPIO_ENABLE;
159
160 writel(readl(gpio_en) | (1 << gpio), gpio_en);
161
162 return 0;
163}
164
165static inline int ar7_gpio_enable_titan(unsigned gpio)
166{
167 void __iomem *gpio_en0 = titan_gpio_chip.regs + TITAN_GPIO_ENBL_0;
168 void __iomem *gpio_en1 = titan_gpio_chip.regs + TITAN_GPIO_ENBL_1;
169
170 writel(readl(gpio >> 5 ? gpio_en1 : gpio_en0) | (1 << (gpio & 0x1f)),
171 gpio >> 5 ? gpio_en1 : gpio_en0);
172
173 return 0;
174}
175
176int ar7_gpio_enable(unsigned gpio)
177{
178 return ar7_is_titan() ? ar7_gpio_enable_titan(gpio) :
179 ar7_gpio_enable_ar7(gpio);
180}
181EXPORT_SYMBOL(ar7_gpio_enable);
182
183static inline int ar7_gpio_disable_ar7(unsigned gpio)
184{
185 void __iomem *gpio_en = ar7_gpio_chip.regs + AR7_GPIO_ENABLE;
186
187 writel(readl(gpio_en) & ~(1 << gpio), gpio_en);
188
189 return 0;
190}
191
192static inline int ar7_gpio_disable_titan(unsigned gpio)
193{
194 void __iomem *gpio_en0 = titan_gpio_chip.regs + TITAN_GPIO_ENBL_0;
195 void __iomem *gpio_en1 = titan_gpio_chip.regs + TITAN_GPIO_ENBL_1;
196
197 writel(readl(gpio >> 5 ? gpio_en1 : gpio_en0) & ~(1 << (gpio & 0x1f)),
198 gpio >> 5 ? gpio_en1 : gpio_en0);
199
200 return 0;
201}
202
203int ar7_gpio_disable(unsigned gpio)
204{
205 return ar7_is_titan() ? ar7_gpio_disable_titan(gpio) :
206 ar7_gpio_disable_ar7(gpio);
207}
208EXPORT_SYMBOL(ar7_gpio_disable);
209
210struct titan_gpio_cfg {
211 u32 reg;
212 u32 shift;
213 u32 func;
214};
215
216static const struct titan_gpio_cfg titan_gpio_table[] = {
217
218 {4, 24, 1},
219 {4, 26, 1},
220 {4, 28, 1},
221 {4, 30, 1},
222 {5, 6, 1},
223 {5, 8, 1},
224 {5, 10, 1},
225 {5, 12, 1},
226 {7, 14, 3},
227 {7, 16, 3},
228 {7, 18, 3},
229 {7, 20, 3},
230 {7, 22, 3},
231 {7, 26, 3},
232 {7, 28, 3},
233 {7, 30, 3},
234 {8, 0, 3},
235 {8, 2, 3},
236 {8, 4, 3},
237 {8, 10, 3},
238 {8, 14, 3},
239 {8, 16, 3},
240 {8, 18, 3},
241 {8, 20, 3},
242 {9, 8, 3},
243 {9, 10, 3},
244 {9, 12, 3},
245 {9, 14, 3},
246 {9, 18, 3},
247 {9, 20, 3},
248 {9, 24, 3},
249 {9, 26, 3},
250 {9, 28, 3},
251 {9, 30, 3},
252 {10, 0, 3},
253 {10, 2, 3},
254 {10, 8, 3},
255 {10, 10, 3},
256 {10, 12, 3},
257 {10, 14, 3},
258 {13, 12, 3},
259 {13, 14, 3},
260 {13, 16, 3},
261 {13, 18, 3},
262 {13, 24, 3},
263 {13, 26, 3},
264 {13, 28, 3},
265 {13, 30, 3},
266 {14, 2, 3},
267 {14, 6, 3},
268 {14, 8, 3},
269 {14, 12, 3}
270};
271
272static int titan_gpio_pinsel(unsigned gpio)
273{
274 struct titan_gpio_cfg gpio_cfg;
275 u32 mux_status, pin_sel_reg, tmp;
276 void __iomem *pin_sel = (void __iomem *)KSEG1ADDR(AR7_REGS_PINSEL);
277
278 if (gpio >= ARRAY_SIZE(titan_gpio_table))
279 return -EINVAL;
280
281 gpio_cfg = titan_gpio_table[gpio];
282 pin_sel_reg = gpio_cfg.reg - 1;
283
284 mux_status = (readl(pin_sel + pin_sel_reg) >> gpio_cfg.shift) & 0x3;
285
286
287 if (!((mux_status == 0) || (mux_status == gpio_cfg.func)))
288 return 0;
289
290
291 tmp = readl(pin_sel + pin_sel_reg);
292 tmp |= ((gpio_cfg.func & 0x3) << gpio_cfg.shift);
293 writel(tmp, pin_sel + pin_sel_reg);
294
295 return 0;
296}
297
298
299static void titan_gpio_init(void)
300{
301 unsigned i;
302
303 for (i = 44; i < 48; i++) {
304 titan_gpio_pinsel(i);
305 ar7_gpio_enable_titan(i);
306 titan_gpio_direction_input(&titan_gpio_chip.chip, i);
307 }
308}
309
310int __init ar7_gpio_init(void)
311{
312 int ret;
313 struct ar7_gpio_chip *gpch;
314 unsigned size;
315
316 if (!ar7_is_titan()) {
317 gpch = &ar7_gpio_chip;
318 size = 0x10;
319 } else {
320 gpch = &titan_gpio_chip;
321 size = 0x1f;
322 }
323
324 gpch->regs = ioremap_nocache(AR7_REGS_GPIO, size);
325 if (!gpch->regs) {
326 printk(KERN_ERR "%s: failed to ioremap regs\n",
327 gpch->chip.label);
328 return -ENOMEM;
329 }
330
331 ret = gpiochip_add_data(&gpch->chip, gpch);
332 if (ret) {
333 printk(KERN_ERR "%s: failed to add gpiochip\n",
334 gpch->chip.label);
335 return ret;
336 }
337 printk(KERN_INFO "%s: registered %d GPIOs\n",
338 gpch->chip.label, gpch->chip.ngpio);
339
340 if (ar7_is_titan())
341 titan_gpio_init();
342
343 return ret;
344}
345
