2 * ADM5120 generic GPIO API support via GPIOLIB
4 * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation.
12 #include <linux/autoconf.h>
13 #include <linux/init.h>
14 #include <linux/types.h>
15 #include <linux/module.h>
16 #include <linux/irq.h>
17 #include <linux/delay.h>
18 #include <linux/platform_device.h>
20 #include <linux/gpio.h>
22 #include <asm/addrspace.h>
24 #include <asm/mach-adm5120/adm5120_defs.h>
25 #include <asm/mach-adm5120/adm5120_info.h>
26 #include <asm/mach-adm5120/adm5120_switch.h>
28 #define GPIO_REG(r) (void __iomem *)(KSEG1ADDR(ADM5120_SWITCH_BASE) + r)
31 void __iomem *reg; /* register address */
32 u8 iv_shift; /* shift amount for input bit */
33 u8 mode_shift; /* shift amount for mode bits */
36 #define GPIO1_DESC(p, l) { \
37 .reg = GPIO_REG(SWITCH_REG_PORT0_LED + ((p) * 4)), \
38 .iv_shift = LED0_IV_SHIFT + (l), \
39 .mode_shift = (l) * 4 \
42 static struct gpio1_desc gpio1_table[15] = {
43 GPIO1_DESC(0, 0), GPIO1_DESC(0, 1), GPIO1_DESC(0, 2),
44 GPIO1_DESC(1, 0), GPIO1_DESC(1, 1), GPIO1_DESC(1, 2),
45 GPIO1_DESC(2, 0), GPIO1_DESC(2, 1), GPIO1_DESC(2, 2),
46 GPIO1_DESC(3, 0), GPIO1_DESC(3, 1), GPIO1_DESC(3, 2),
47 GPIO1_DESC(4, 0), GPIO1_DESC(4, 1), GPIO1_DESC(4, 2)
50 static u32 gpio_conf2;
52 int adm5120_gpio_to_irq(unsigned gpio)
57 case ADM5120_GPIO_PIN2:
58 ret = ADM5120_IRQ_GPIO2;
60 case ADM5120_GPIO_PIN4:
61 ret = ADM5120_IRQ_GPIO4;
70 EXPORT_SYMBOL(adm5120_gpio_to_irq);
72 int adm5120_irq_to_gpio(unsigned irq)
77 case ADM5120_IRQ_GPIO2:
78 ret = ADM5120_GPIO_PIN2;
80 case ADM5120_IRQ_GPIO4:
81 ret = ADM5120_GPIO_PIN4;
90 EXPORT_SYMBOL(adm5120_irq_to_gpio);
93 * Helpers for GPIO lines in GPIO_CONF0 register
95 #define PIN_IM(p) ((1 << GPIO_CONF0_IM_SHIFT) << p)
96 #define PIN_IV(p) ((1 << GPIO_CONF0_IV_SHIFT) << p)
97 #define PIN_OE(p) ((1 << GPIO_CONF0_OE_SHIFT) << p)
98 #define PIN_OV(p) ((1 << GPIO_CONF0_OV_SHIFT) << p)
100 int __adm5120_gpio0_get_value(unsigned offset)
105 reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
107 t = __raw_readl(reg);
108 if ((t & PIN_IM(offset)) != 0)
115 EXPORT_SYMBOL(__adm5120_gpio0_get_value);
117 void __adm5120_gpio0_set_value(unsigned offset, int value)
122 reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
124 t = __raw_readl(reg);
126 t &= ~(PIN_OV(offset));
130 __raw_writel(t, reg);
132 EXPORT_SYMBOL(__adm5120_gpio0_set_value);
134 static int adm5120_gpio0_get_value(struct gpio_chip *chip, unsigned offset)
136 return __adm5120_gpio0_get_value(offset);
139 static void adm5120_gpio0_set_value(struct gpio_chip *chip,
140 unsigned offset, int value)
142 __adm5120_gpio0_set_value(offset, value);
145 static int adm5120_gpio0_direction_input(struct gpio_chip *chip,
151 reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
153 t = __raw_readl(reg);
154 t &= ~(PIN_OE(offset));
156 __raw_writel(t, reg);
161 static int adm5120_gpio0_direction_output(struct gpio_chip *chip,
162 unsigned offset, int value)
167 reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
169 t = __raw_readl(reg);
170 t &= ~(PIN_IM(offset) | PIN_OV(offset));
176 __raw_writel(t, reg);
181 static struct gpio_chip adm5120_gpio0_chip = {
182 .label = "adm5120 gpio0",
183 .get = adm5120_gpio0_get_value,
184 .set = adm5120_gpio0_set_value,
185 .direction_input = adm5120_gpio0_direction_input,
186 .direction_output = adm5120_gpio0_direction_output,
187 .base = ADM5120_GPIO_PIN0,
188 .ngpio = ADM5120_GPIO_PIN7 - ADM5120_GPIO_PIN0 + 1,
191 int __adm5120_gpio1_get_value(unsigned offset)
196 reg = gpio1_table[offset].reg;
198 t = __raw_readl(reg);
199 m = (t >> gpio1_table[offset].mode_shift) & LED_MODE_MASK;
200 if (m == LED_MODE_INPUT)
201 return (t >> gpio1_table[offset].iv_shift) & 1;
203 if (m == LED_MODE_OUT_LOW)
208 EXPORT_SYMBOL(__adm5120_gpio1_get_value);
210 void __adm5120_gpio1_set_value(unsigned offset, int value)
215 reg = gpio1_table[offset].reg;
216 s = gpio1_table[offset].mode_shift;
218 t = __raw_readl(reg);
219 t &= ~(LED_MODE_MASK << s);
222 case ADM5120_GPIO_LOW:
223 t |= (LED_MODE_OUT_LOW << s);
225 case ADM5120_GPIO_FLASH:
226 case ADM5120_GPIO_LINK:
227 case ADM5120_GPIO_SPEED:
228 case ADM5120_GPIO_DUPLEX:
229 case ADM5120_GPIO_ACT:
230 case ADM5120_GPIO_COLL:
231 case ADM5120_GPIO_LINK_ACT:
232 case ADM5120_GPIO_DUPLEX_COLL:
233 case ADM5120_GPIO_10M_ACT:
234 case ADM5120_GPIO_100M_ACT:
235 t |= ((value & LED_MODE_MASK) << s);
238 t |= (LED_MODE_OUT_HIGH << s);
242 __raw_writel(t, reg);
244 EXPORT_SYMBOL(__adm5120_gpio1_set_value);
246 static int adm5120_gpio1_get_value(struct gpio_chip *chip, unsigned offset)
248 return __adm5120_gpio1_get_value(offset);
251 static void adm5120_gpio1_set_value(struct gpio_chip *chip,
252 unsigned offset, int value)
254 __adm5120_gpio1_set_value(offset, value);
257 static int adm5120_gpio1_direction_input(struct gpio_chip *chip,
263 reg = gpio1_table[offset].reg;
264 t = __raw_readl(reg);
265 t &= ~(LED_MODE_MASK << gpio1_table[offset].mode_shift);
266 __raw_writel(t, reg);
271 static int adm5120_gpio1_direction_output(struct gpio_chip *chip,
272 unsigned offset, int value)
274 __adm5120_gpio1_set_value(offset, value);
278 static struct gpio_chip adm5120_gpio1_chip = {
279 .label = "adm5120 gpio1",
280 .get = adm5120_gpio1_get_value,
281 .set = adm5120_gpio1_set_value,
282 .direction_input = adm5120_gpio1_direction_input,
283 .direction_output = adm5120_gpio1_direction_output,
284 .base = ADM5120_GPIO_P0L0,
285 .ngpio = ADM5120_GPIO_P4L2 - ADM5120_GPIO_P0L0 + 1,
288 void __init adm5120_gpio_csx0_enable(void)
290 gpio_conf2 |= GPIO_CONF2_CSX0;
291 SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
293 gpio_request(ADM5120_GPIO_PIN1, "CSX0");
296 void __init adm5120_gpio_csx1_enable(void)
298 gpio_conf2 |= GPIO_CONF2_CSX1;
299 SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
301 gpio_request(ADM5120_GPIO_PIN3, "CSX1");
304 void __init adm5120_gpio_ew_enable(void)
306 gpio_conf2 |= GPIO_CONF2_EW;
307 SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
309 gpio_request(ADM5120_GPIO_PIN0, "EW");
312 void __init adm5120_gpio_init(void)
316 SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
318 if (adm5120_package_pqfp()) {
319 gpiochip_reserve(ADM5120_GPIO_PIN4, 4);
320 adm5120_gpio0_chip.ngpio = 4;
323 err = gpiochip_add(&adm5120_gpio0_chip);
325 panic("cannot add ADM5120 GPIO0 chip, error=%d", err);
327 err = gpiochip_add(&adm5120_gpio1_chip);
329 panic("cannot add ADM5120 GPIO1 chip, error=%d", err);