Root/target/linux/adm5120/files/arch/mips/adm5120/common/gpio.c

1/*
2 * ADM5120 generic GPIO API support via GPIOLIB
3 *
4 * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
5 *
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.
9 *
10 */
11
12#include <linux/init.h>
13#include <linux/types.h>
14#include <linux/module.h>
15#include <linux/irq.h>
16#include <linux/delay.h>
17#include <linux/platform_device.h>
18#include <linux/io.h>
19#include <linux/gpio.h>
20
21#include <asm/addrspace.h>
22
23#include <asm/mach-adm5120/adm5120_defs.h>
24#include <asm/mach-adm5120/adm5120_info.h>
25#include <asm/mach-adm5120/adm5120_switch.h>
26
27#define GPIO_REG(r) (void __iomem *)(KSEG1ADDR(ADM5120_SWITCH_BASE) + r)
28
29struct gpio1_desc {
30    void __iomem *reg; /* register address */
31    u8 iv_shift; /* shift amount for input bit */
32    u8 mode_shift; /* shift amount for mode bits */
33};
34
35#define GPIO1_DESC(p, l) { \
36        .reg = GPIO_REG(SWITCH_REG_PORT0_LED + ((p) * 4)), \
37        .iv_shift = LED0_IV_SHIFT + (l), \
38        .mode_shift = (l) * 4 \
39    }
40
41static struct gpio1_desc gpio1_table[15] = {
42    GPIO1_DESC(0, 0), GPIO1_DESC(0, 1), GPIO1_DESC(0, 2),
43    GPIO1_DESC(1, 0), GPIO1_DESC(1, 1), GPIO1_DESC(1, 2),
44    GPIO1_DESC(2, 0), GPIO1_DESC(2, 1), GPIO1_DESC(2, 2),
45    GPIO1_DESC(3, 0), GPIO1_DESC(3, 1), GPIO1_DESC(3, 2),
46    GPIO1_DESC(4, 0), GPIO1_DESC(4, 1), GPIO1_DESC(4, 2)
47};
48
49static u32 gpio_conf2;
50
51int adm5120_gpio_to_irq(unsigned gpio)
52{
53    int ret;
54
55    switch (gpio) {
56    case ADM5120_GPIO_PIN2:
57        ret = ADM5120_IRQ_GPIO2;
58        break;
59    case ADM5120_GPIO_PIN4:
60        ret = ADM5120_IRQ_GPIO4;
61        break;
62    default:
63        ret = -EINVAL;
64        break;
65    }
66
67    return ret;
68}
69EXPORT_SYMBOL(adm5120_gpio_to_irq);
70
71int adm5120_irq_to_gpio(unsigned irq)
72{
73    int ret;
74
75    switch (irq) {
76    case ADM5120_IRQ_GPIO2:
77        ret = ADM5120_GPIO_PIN2;
78        break;
79    case ADM5120_IRQ_GPIO4:
80        ret = ADM5120_GPIO_PIN4;
81        break;
82    default:
83        ret = -EINVAL;
84        break;
85    }
86
87    return ret;
88}
89EXPORT_SYMBOL(adm5120_irq_to_gpio);
90
91/*
92 * Helpers for GPIO lines in GPIO_CONF0 register
93 */
94#define PIN_IM(p) ((1 << GPIO_CONF0_IM_SHIFT) << p)
95#define PIN_IV(p) ((1 << GPIO_CONF0_IV_SHIFT) << p)
96#define PIN_OE(p) ((1 << GPIO_CONF0_OE_SHIFT) << p)
97#define PIN_OV(p) ((1 << GPIO_CONF0_OV_SHIFT) << p)
98
99int __adm5120_gpio0_get_value(unsigned offset)
100{
101    void __iomem **reg;
102    u32 t;
103
104    reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
105
106    t = __raw_readl(reg);
107    if ((t & PIN_IM(offset)) != 0)
108        t &= PIN_IV(offset);
109    else
110        t &= PIN_OV(offset);
111
112    return (t) ? 1 : 0;
113}
114EXPORT_SYMBOL(__adm5120_gpio0_get_value);
115
116void __adm5120_gpio0_set_value(unsigned offset, int value)
117{
118    void __iomem **reg;
119    u32 t;
120
121    reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
122
123    t = __raw_readl(reg);
124    if (value == 0)
125        t &= ~(PIN_OV(offset));
126    else
127        t |= PIN_OV(offset);
128
129    __raw_writel(t, reg);
130}
131EXPORT_SYMBOL(__adm5120_gpio0_set_value);
132
133static int adm5120_gpio0_get_value(struct gpio_chip *chip, unsigned offset)
134{
135    return __adm5120_gpio0_get_value(offset);
136}
137
138static void adm5120_gpio0_set_value(struct gpio_chip *chip,
139                    unsigned offset, int value)
140{
141    __adm5120_gpio0_set_value(offset, value);
142}
143
144static int adm5120_gpio0_direction_input(struct gpio_chip *chip,
145                     unsigned offset)
146{
147    void __iomem **reg;
148    u32 t;
149
150    reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
151
152    t = __raw_readl(reg);
153    t &= ~(PIN_OE(offset));
154    t |= PIN_IM(offset);
155    __raw_writel(t, reg);
156
157    return 0;
158}
159
160static int adm5120_gpio0_direction_output(struct gpio_chip *chip,
161                      unsigned offset, int value)
162{
163    void __iomem **reg;
164    u32 t;
165
166    reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
167
168    t = __raw_readl(reg);
169    t &= ~(PIN_IM(offset) | PIN_OV(offset));
170    t |= PIN_OE(offset);
171
172    if (value)
173        t |= PIN_OV(offset);
174
175    __raw_writel(t, reg);
176
177    return 0;
178}
179
180static struct gpio_chip adm5120_gpio0_chip = {
181    .label = "adm5120 gpio0",
182    .get = adm5120_gpio0_get_value,
183    .set = adm5120_gpio0_set_value,
184    .direction_input = adm5120_gpio0_direction_input,
185    .direction_output = adm5120_gpio0_direction_output,
186    .base = ADM5120_GPIO_PIN0,
187    .ngpio = ADM5120_GPIO_PIN7 - ADM5120_GPIO_PIN0 + 1,
188};
189
190int __adm5120_gpio1_get_value(unsigned offset)
191{
192    void __iomem **reg;
193    u32 t, m;
194
195    reg = gpio1_table[offset].reg;
196
197    t = __raw_readl(reg);
198    m = (t >> gpio1_table[offset].mode_shift) & LED_MODE_MASK;
199    if (m == LED_MODE_INPUT)
200        return (t >> gpio1_table[offset].iv_shift) & 1;
201
202    if (m == LED_MODE_OUT_LOW)
203        return 0;
204
205    return 1;
206}
207EXPORT_SYMBOL(__adm5120_gpio1_get_value);
208
209void __adm5120_gpio1_set_value(unsigned offset, int value)
210{
211    void __iomem **reg;
212    u32 t, s;
213
214    reg = gpio1_table[offset].reg;
215    s = gpio1_table[offset].mode_shift;
216
217    t = __raw_readl(reg);
218    t &= ~(LED_MODE_MASK << s);
219
220    switch (value) {
221    case ADM5120_GPIO_LOW:
222        t |= (LED_MODE_OUT_LOW << s);
223        break;
224    case ADM5120_GPIO_FLASH:
225    case ADM5120_GPIO_LINK:
226    case ADM5120_GPIO_SPEED:
227    case ADM5120_GPIO_DUPLEX:
228    case ADM5120_GPIO_ACT:
229    case ADM5120_GPIO_COLL:
230    case ADM5120_GPIO_LINK_ACT:
231    case ADM5120_GPIO_DUPLEX_COLL:
232    case ADM5120_GPIO_10M_ACT:
233    case ADM5120_GPIO_100M_ACT:
234        t |= ((value & LED_MODE_MASK) << s);
235        break;
236    default:
237        t |= (LED_MODE_OUT_HIGH << s);
238        break;
239    }
240
241    __raw_writel(t, reg);
242}
243EXPORT_SYMBOL(__adm5120_gpio1_set_value);
244
245static int adm5120_gpio1_get_value(struct gpio_chip *chip, unsigned offset)
246{
247    return __adm5120_gpio1_get_value(offset);
248}
249
250static void adm5120_gpio1_set_value(struct gpio_chip *chip,
251                    unsigned offset, int value)
252{
253    __adm5120_gpio1_set_value(offset, value);
254}
255
256static int adm5120_gpio1_direction_input(struct gpio_chip *chip,
257                     unsigned offset)
258{
259    void __iomem **reg;
260    u32 t;
261
262    reg = gpio1_table[offset].reg;
263    t = __raw_readl(reg);
264    t &= ~(LED_MODE_MASK << gpio1_table[offset].mode_shift);
265    __raw_writel(t, reg);
266
267    return 0;
268}
269
270static int adm5120_gpio1_direction_output(struct gpio_chip *chip,
271                      unsigned offset, int value)
272{
273    __adm5120_gpio1_set_value(offset, value);
274    return 0;
275}
276
277static struct gpio_chip adm5120_gpio1_chip = {
278    .label = "adm5120 gpio1",
279    .get = adm5120_gpio1_get_value,
280    .set = adm5120_gpio1_set_value,
281    .direction_input = adm5120_gpio1_direction_input,
282    .direction_output = adm5120_gpio1_direction_output,
283    .base = ADM5120_GPIO_P0L0,
284    .ngpio = ADM5120_GPIO_P4L2 - ADM5120_GPIO_P0L0 + 1,
285};
286
287void __init adm5120_gpio_csx0_enable(void)
288{
289    gpio_conf2 |= GPIO_CONF2_CSX0;
290    SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
291
292    gpio_request(ADM5120_GPIO_PIN1, "CSX0");
293}
294
295void __init adm5120_gpio_csx1_enable(void)
296{
297    gpio_conf2 |= GPIO_CONF2_CSX1;
298    SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
299
300    gpio_request(ADM5120_GPIO_PIN3, "CSX1");
301}
302
303void __init adm5120_gpio_ew_enable(void)
304{
305    gpio_conf2 |= GPIO_CONF2_EW;
306    SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
307
308    gpio_request(ADM5120_GPIO_PIN0, "EW");
309}
310
311void __init adm5120_gpio_init(void)
312{
313    int err;
314
315    SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
316
317    if (adm5120_package_pqfp()) {
318        gpiochip_reserve(ADM5120_GPIO_PIN4, 4);
319        adm5120_gpio0_chip.ngpio = 4;
320    }
321
322    err = gpiochip_add(&adm5120_gpio0_chip);
323    if (err)
324        panic("cannot add ADM5120 GPIO0 chip, error=%d", err);
325
326    err = gpiochip_add(&adm5120_gpio1_chip);
327    if (err)
328        panic("cannot add ADM5120 GPIO1 chip, error=%d", err);
329
330}
331

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