2 * ADM5120 generic GPIO API support
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_READ(r) __raw_readl((r))
29 #define GPIO_WRITE(v, r) __raw_writel((v), (r))
30 #define GPIO_REG(r) (void __iomem *)(KSEG1ADDR(ADM5120_SWITCH_BASE)+r)
32 struct adm5120_gpio_line
{
38 #define GPIO_FLAG_VALID 0x01
39 #define GPIO_FLAG_USED 0x02
42 void __iomem
*reg
; /* LED register address */
43 u8 iv_shift
; /* shift amount for input bit */
44 u8 mode_shift
; /* shift amount for mode bits */
47 #define LED_DESC(p, l) { \
48 .reg = GPIO_REG(SWITCH_REG_PORT0_LED+((p) * 4)), \
49 .iv_shift = LED0_IV_SHIFT + (l), \
50 .mode_shift = (l) * 4 \
53 static struct led_desc led_table
[15] = {
54 LED_DESC(0, 0), LED_DESC(0, 1), LED_DESC(0, 2),
55 LED_DESC(1, 0), LED_DESC(1, 1), LED_DESC(1, 2),
56 LED_DESC(2, 0), LED_DESC(2, 1), LED_DESC(2, 2),
57 LED_DESC(3, 0), LED_DESC(3, 1), LED_DESC(3, 2),
58 LED_DESC(4, 0), LED_DESC(4, 1), LED_DESC(4, 2)
61 static struct adm5120_gpio_line adm5120_gpio_map
[ADM5120_GPIO_COUNT
];
63 static u32 gpio_conf2
;
65 /*-------------------------------------------------------------------------*/
67 static inline int gpio_is_invalid(unsigned gpio
)
69 if ((gpio
> ADM5120_GPIO_MAX
) ||
70 (adm5120_gpio_map
[gpio
].flags
& GPIO_FLAG_VALID
) == 0)
76 static inline int gpio_is_used(unsigned gpio
)
78 return ((adm5120_gpio_map
[gpio
].flags
& GPIO_FLAG_USED
) != 0);
81 /*-------------------------------------------------------------------------*/
84 * Helpers for GPIO lines in GPIO_CONF0 register
86 #define PIN_IM(p) ((1 << GPIO_CONF0_IM_SHIFT) << p)
87 #define PIN_IV(p) ((1 << GPIO_CONF0_IV_SHIFT) << p)
88 #define PIN_OE(p) ((1 << GPIO_CONF0_OE_SHIFT) << p)
89 #define PIN_OV(p) ((1 << GPIO_CONF0_OV_SHIFT) << p)
91 static inline int pins_direction_input(unsigned pin
)
96 reg
= GPIO_REG(SWITCH_REG_GPIO_CONF0
);
106 static inline int pins_direction_output(unsigned pin
, int value
)
111 reg
= GPIO_REG(SWITCH_REG_GPIO_CONF0
);
114 t
&= ~(PIN_IM(pin
) | PIN_OV(pin
));
125 static inline int pins_get_value(unsigned pin
)
130 reg
= GPIO_REG(SWITCH_REG_GPIO_CONF0
);
133 if ((t
& PIN_IM(pin
)) != 0)
141 static inline void pins_set_value(unsigned pin
, int value
)
146 reg
= GPIO_REG(SWITCH_REG_GPIO_CONF0
);
158 * Helpers for GPIO lines in PORTx_LED registers
160 static inline int leds_direction_input(unsigned led
)
165 reg
= led_table
[led
].reg
;
167 t
&= ~(LED_MODE_MASK
<< led_table
[led
].mode_shift
);
173 static inline int leds_direction_output(unsigned led
, int value
)
178 reg
= led_table
[led
].reg
;
179 s
= led_table
[led
].mode_shift
;
182 t
&= ~(LED_MODE_MASK
<< s
);
185 case ADM5120_GPIO_LOW
:
186 t
|= (LED_MODE_OUT_LOW
<< s
);
188 case ADM5120_GPIO_FLASH
:
189 case ADM5120_GPIO_LINK
:
190 case ADM5120_GPIO_SPEED
:
191 case ADM5120_GPIO_DUPLEX
:
192 case ADM5120_GPIO_ACT
:
193 case ADM5120_GPIO_COLL
:
194 case ADM5120_GPIO_LINK_ACT
:
195 case ADM5120_GPIO_DUPLEX_COLL
:
196 case ADM5120_GPIO_10M_ACT
:
197 case ADM5120_GPIO_100M_ACT
:
198 t
|= ((value
& LED_MODE_MASK
) << s
);
201 t
|= (LED_MODE_OUT_HIGH
<< s
);
210 static inline int leds_get_value(unsigned led
)
215 reg
= led_table
[led
].reg
;
218 m
= (t
>> led_table
[led
].mode_shift
) & LED_MODE_MASK
;
219 if (m
== LED_MODE_INPUT
)
220 return (t
>> led_table
[led
].iv_shift
) & 1;
222 if (m
== LED_MODE_OUT_LOW
)
228 /*-------------------------------------------------------------------------*/
231 * Main GPIO support routines
233 int adm5120_gpio_direction_input(unsigned gpio
)
235 if (gpio_is_invalid(gpio
))
238 if (gpio
< ADM5120_GPIO_P0L0
)
239 return pins_direction_input(gpio
);
241 gpio
-= ADM5120_GPIO_P0L0
;
242 return leds_direction_input(gpio
);
244 EXPORT_SYMBOL(adm5120_gpio_direction_input
);
246 int adm5120_gpio_direction_output(unsigned gpio
, int value
)
248 if (gpio_is_invalid(gpio
))
251 if (gpio
< ADM5120_GPIO_P0L0
)
252 return pins_direction_output(gpio
, value
);
254 gpio
-= ADM5120_GPIO_P0L0
;
255 return leds_direction_output(gpio
, value
);
257 EXPORT_SYMBOL(adm5120_gpio_direction_output
);
259 int adm5120_gpio_get_value(unsigned gpio
)
261 if (gpio
< ADM5120_GPIO_P0L0
)
262 return pins_get_value(gpio
);
264 gpio
-= ADM5120_GPIO_P0L0
;
265 return leds_get_value(gpio
);
267 EXPORT_SYMBOL(adm5120_gpio_get_value
);
269 void adm5120_gpio_set_value(unsigned gpio
, int value
)
271 if (gpio
< ADM5120_GPIO_P0L0
) {
272 pins_set_value(gpio
, value
);
276 gpio
-= ADM5120_GPIO_P0L0
;
277 leds_direction_output(gpio
, value
);
279 EXPORT_SYMBOL(adm5120_gpio_set_value
);
281 int adm5120_gpio_request(unsigned gpio
, const char *label
)
283 if (gpio_is_invalid(gpio
))
286 if (gpio_is_used(gpio
))
289 adm5120_gpio_map
[gpio
].flags
|= GPIO_FLAG_USED
;
290 adm5120_gpio_map
[gpio
].label
= label
;
294 EXPORT_SYMBOL(adm5120_gpio_request
);
296 void adm5120_gpio_free(unsigned gpio
)
298 if (gpio_is_invalid(gpio
))
301 adm5120_gpio_map
[gpio
].flags
&= ~GPIO_FLAG_USED
;
302 adm5120_gpio_map
[gpio
].label
= NULL
;
304 EXPORT_SYMBOL(adm5120_gpio_free
);
306 int adm5120_gpio_to_irq(unsigned gpio
)
308 if (gpio
> ADM5120_GPIO_MAX
)
311 return adm5120_gpio_map
[gpio
].irq
;
313 EXPORT_SYMBOL(adm5120_gpio_to_irq
);
315 int adm5120_irq_to_gpio(unsigned irq
)
319 for (i
= 0; i
< ADM5120_GPIO_COUNT
; i
++)
320 if (adm5120_gpio_map
[i
].irq
== irq
)
325 EXPORT_SYMBOL(adm5120_irq_to_gpio
);
327 /*-------------------------------------------------------------------------*/
329 void __init
adm5120_gpio_csx0_enable(void)
331 gpio_conf2
|= GPIO_CONF2_CSX0
;
332 SW_WRITE_REG(SWITCH_REG_GPIO_CONF2
, gpio_conf2
);
334 adm5120_gpio_map
[ADM5120_GPIO_PIN1
].flags
&= ~GPIO_FLAG_VALID
;
335 adm5120_gpio_map
[ADM5120_GPIO_PIN2
].irq
= ADM5120_IRQ_GPIO2
;
338 void __init
adm5120_gpio_csx1_enable(void)
340 gpio_conf2
|= GPIO_CONF2_CSX1
;
341 SW_WRITE_REG(SWITCH_REG_GPIO_CONF2
, gpio_conf2
);
343 adm5120_gpio_map
[ADM5120_GPIO_PIN3
].flags
&= ~GPIO_FLAG_VALID
;
344 if (adm5120_package_bga())
345 adm5120_gpio_map
[ADM5120_GPIO_PIN4
].irq
= ADM5120_IRQ_GPIO4
;
348 void __init
adm5120_gpio_ew_enable(void)
350 gpio_conf2
|= GPIO_CONF2_EW
;
351 SW_WRITE_REG(SWITCH_REG_GPIO_CONF2
, gpio_conf2
);
353 adm5120_gpio_map
[ADM5120_GPIO_PIN0
].flags
&= ~GPIO_FLAG_VALID
;
356 void __init
adm5120_gpio_init(void)
361 SW_WRITE_REG(SWITCH_REG_GPIO_CONF2
, gpio_conf2
);
363 for (i
= 0; i
< ADM5120_GPIO_COUNT
; i
++)
364 adm5120_gpio_map
[i
].flags
= GPIO_FLAG_VALID
;
366 if (adm5120_package_pqfp()) {
367 adm5120_gpio_map
[ADM5120_GPIO_PIN4
].flags
&= ~GPIO_FLAG_VALID
;
368 adm5120_gpio_map
[ADM5120_GPIO_PIN5
].flags
&= ~GPIO_FLAG_VALID
;
369 adm5120_gpio_map
[ADM5120_GPIO_PIN6
].flags
&= ~GPIO_FLAG_VALID
;
370 adm5120_gpio_map
[ADM5120_GPIO_PIN7
].flags
&= ~GPIO_FLAG_VALID
;