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