2 * Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
3 * Copyright (C) 2007 Eugene Konev <ejka@openwrt.org>
4 * Copyright (C) 2009-2010 Florian Fainelli <florian@openwrt.org>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 #include <linux/module.h>
22 #include <linux/gpio.h>
24 #include <asm/mach-ar7/gpio.h>
26 struct ar7_gpio_chip {
28 struct gpio_chip chip;
31 static int ar7_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
33 struct ar7_gpio_chip *gpch =
34 container_of(chip, struct ar7_gpio_chip, chip);
35 void __iomem *gpio_in = gpch->regs + AR7_GPIO_INPUT;
37 return readl(gpio_in) & (1 << gpio);
40 static int titan_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
42 struct ar7_gpio_chip *gpch =
43 container_of(chip, struct ar7_gpio_chip, chip);
44 void __iomem *gpio_in0 = gpch->regs + TITAN_GPIO_INPUT_0;
45 void __iomem *gpio_in1 = gpch->regs + TITAN_GPIO_INPUT_1;
47 return readl(gpio >> 5 ? gpio_in1 : gpio_in0) & (1 << (gpio & 0x1f));
50 static void ar7_gpio_set_value(struct gpio_chip *chip,
51 unsigned gpio, int value)
53 struct ar7_gpio_chip *gpch =
54 container_of(chip, struct ar7_gpio_chip, chip);
55 void __iomem *gpio_out = gpch->regs + AR7_GPIO_OUTPUT;
58 tmp = readl(gpio_out) & ~(1 << gpio);
61 writel(tmp, gpio_out);
64 static void titan_gpio_set_value(struct gpio_chip *chip,
65 unsigned gpio, int value)
67 struct ar7_gpio_chip *gpch =
68 container_of(chip, struct ar7_gpio_chip, chip);
69 void __iomem *gpio_out0 = gpch->regs + TITAN_GPIO_OUTPUT_0;
70 void __iomem *gpio_out1 = gpch->regs + TITAN_GPIO_OUTPUT_1;
73 tmp = readl(gpio >> 5 ? gpio_out1 : gpio_out0) & ~(1 << (gpio & 0x1f));
75 tmp |= 1 << (gpio & 0x1f);
76 writel(tmp, gpio >> 5 ? gpio_out1 : gpio_out0);
79 static int ar7_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
81 struct ar7_gpio_chip *gpch =
82 container_of(chip, struct ar7_gpio_chip, chip);
83 void __iomem *gpio_dir = gpch->regs + AR7_GPIO_DIR;
85 writel(readl(gpio_dir) | (1 << gpio), gpio_dir);
90 static int titan_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
92 struct ar7_gpio_chip *gpch =
93 container_of(chip, struct ar7_gpio_chip, chip);
94 void __iomem *gpio_dir0 = gpch->regs + TITAN_GPIO_DIR_0;
95 void __iomem *gpio_dir1 = gpch->regs + TITAN_GPIO_DIR_1;
97 if (gpio >= TITAN_GPIO_MAX)
100 writel(readl(gpio >> 5 ? gpio_dir1 : gpio_dir0) | (1 << (gpio & 0x1f)),
101 gpio >> 5 ? gpio_dir1 : gpio_dir0);
105 static int ar7_gpio_direction_output(struct gpio_chip *chip,
106 unsigned gpio, int value)
108 struct ar7_gpio_chip *gpch =
109 container_of(chip, struct ar7_gpio_chip, chip);
110 void __iomem *gpio_dir = gpch->regs + AR7_GPIO_DIR;
112 ar7_gpio_set_value(chip, gpio, value);
113 writel(readl(gpio_dir) & ~(1 << gpio), gpio_dir);
118 static int titan_gpio_direction_output(struct gpio_chip *chip,
119 unsigned gpio, int value)
121 struct ar7_gpio_chip *gpch =
122 container_of(chip, struct ar7_gpio_chip, chip);
123 void __iomem *gpio_dir0 = gpch->regs + TITAN_GPIO_DIR_0;
124 void __iomem *gpio_dir1 = gpch->regs + TITAN_GPIO_DIR_1;
126 if (gpio >= TITAN_GPIO_MAX)
129 titan_gpio_set_value(chip, gpio, value);
130 writel(readl(gpio >> 5 ? gpio_dir1 : gpio_dir0) & ~(1 <<
131 (gpio & 0x1f)), gpio >> 5 ? gpio_dir1 : gpio_dir0);
136 static struct ar7_gpio_chip ar7_gpio_chip = {
139 .direction_input = ar7_gpio_direction_input,
140 .direction_output = ar7_gpio_direction_output,
141 .set = ar7_gpio_set_value,
142 .get = ar7_gpio_get_value,
144 .ngpio = AR7_GPIO_MAX,
148 static struct ar7_gpio_chip titan_gpio_chip = {
150 .label = "titan-gpio",
151 .direction_input = titan_gpio_direction_input,
152 .direction_output = titan_gpio_direction_output,
153 .set = titan_gpio_set_value,
154 .get = titan_gpio_get_value,
156 .ngpio = TITAN_GPIO_MAX,
160 static inline int ar7_gpio_enable_ar7(unsigned gpio)
162 void __iomem *gpio_en = ar7_gpio_chip.regs + AR7_GPIO_ENABLE;
164 writel(readl(gpio_en) | (1 << gpio), gpio_en);
169 static inline int ar7_gpio_enable_titan(unsigned gpio)
171 void __iomem *gpio_en0 = titan_gpio_chip.regs + TITAN_GPIO_ENBL_0;
172 void __iomem *gpio_en1 = titan_gpio_chip.regs + TITAN_GPIO_ENBL_1;
174 writel(readl(gpio >> 5 ? gpio_en1 : gpio_en0) | (1 << (gpio & 0x1f)),
175 gpio >> 5 ? gpio_en1 : gpio_en0);
180 int ar7_gpio_enable(unsigned gpio)
182 return ar7_is_titan() ? ar7_gpio_enable_titan(gpio) :
183 ar7_gpio_enable_ar7(gpio);
185 EXPORT_SYMBOL(ar7_gpio_enable);
187 static inline int ar7_gpio_disable_ar7(unsigned gpio)
189 void __iomem *gpio_en = ar7_gpio_chip.regs + AR7_GPIO_ENABLE;
191 writel(readl(gpio_en) & ~(1 << gpio), gpio_en);
196 static inline int ar7_gpio_disable_titan(unsigned gpio)
198 void __iomem *gpio_en0 = titan_gpio_chip.regs + TITAN_GPIO_ENBL_0;
199 void __iomem *gpio_en1 = titan_gpio_chip.regs + TITAN_GPIO_ENBL_1;
201 writel(readl(gpio >> 5 ? gpio_en1 : gpio_en0) & ~(1 << (gpio & 0x1f)),
202 gpio >> 5 ? gpio_en1 : gpio_en0);
207 int ar7_gpio_disable(unsigned gpio)
209 return ar7_is_titan() ? ar7_gpio_disable_titan(gpio) :
210 ar7_gpio_disable_ar7(gpio);
212 EXPORT_SYMBOL(ar7_gpio_disable);
214 struct titan_gpio_cfg {
220 static struct titan_gpio_cfg titan_gpio_table[] = {
221 /* reg, start bit, mux value */
276 static int titan_gpio_pinsel(unsigned gpio)
278 struct titan_gpio_cfg gpio_cfg;
279 u32 mux_status, pin_sel_reg, tmp;
280 void __iomem *pin_sel = (void __iomem *)KSEG1ADDR(AR7_REGS_PINSEL);
282 if (gpio >= ARRAY_SIZE(titan_gpio_table))
285 gpio_cfg = titan_gpio_table[gpio];
286 pin_sel_reg = gpio_cfg.reg - 1;
288 mux_status = (readl(pin_sel + pin_sel_reg) >> gpio_cfg.shift) & 0x3;
290 /* Check the mux status */
291 if (!((mux_status == 0) || (mux_status == gpio_cfg.func)))
294 /* Set the pin sel value */
295 tmp = readl(pin_sel + pin_sel_reg);
296 tmp |= ((gpio_cfg.func & 0x3) << gpio_cfg.shift);
297 writel(tmp, pin_sel + pin_sel_reg);
302 /* Perform minimal Titan GPIO configuration */
303 static void titan_gpio_init(void)
307 for (i = 44; i < 48; i++) {
308 titan_gpio_pinsel(i);
309 ar7_gpio_enable_titan(i);
310 titan_gpio_direction_input(&titan_gpio_chip.chip, i);
314 int __init ar7_gpio_init(void)
317 struct ar7_gpio_chip *gpch;
320 if (!ar7_is_titan()) {
321 gpch = &ar7_gpio_chip;
324 gpch = &titan_gpio_chip;
328 gpch->regs = ioremap_nocache(AR7_REGS_GPIO,
329 AR7_REGS_GPIO + 0x10);
332 printk(KERN_ERR "%s: failed to ioremap regs\n",
337 ret = gpiochip_add(&gpch->chip);
339 printk(KERN_ERR "%s: failed to add gpiochip\n",
343 printk(KERN_INFO "%s: registered %d GPIOs\n",
344 gpch->chip.label, gpch->chip.ngpio);