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Linux/arch/mips/include/asm/mach-au1x00/gpio-au1300.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * gpio-au1300.h -- GPIO control for Au1300 GPIC and compatibles.
  4  *
  5  * Copyright (c) 2009-2011 Manuel Lauss <manuel.lauss@googlemail.com>
  6  */
  7 
  8 #ifndef _GPIO_AU1300_H_
  9 #define _GPIO_AU1300_H_
 10 
 11 #include <asm/addrspace.h>
 12 #include <asm/io.h>
 13 #include <asm/mach-au1x00/au1000.h>
 14 
 15 struct gpio;
 16 struct gpio_chip;
 17 
 18 /* with the current GPIC design, up to 128 GPIOs are possible.
 19  * The only implementation so far is in the Au1300, which has 75 externally
 20  * available GPIOs.
 21  */
 22 #define AU1300_GPIO_BASE        0
 23 #define AU1300_GPIO_NUM         75
 24 #define AU1300_GPIO_MAX         (AU1300_GPIO_BASE + AU1300_GPIO_NUM - 1)
 25 
 26 #define AU1300_GPIC_ADDR        \
 27         (void __iomem *)KSEG1ADDR(AU1300_GPIC_PHYS_ADDR)
 28 
 29 static inline int au1300_gpio_get_value(unsigned int gpio)
 30 {
 31         void __iomem *roff = AU1300_GPIC_ADDR;
 32         int bit;
 33 
 34         gpio -= AU1300_GPIO_BASE;
 35         roff += GPIC_GPIO_BANKOFF(gpio);
 36         bit = GPIC_GPIO_TO_BIT(gpio);
 37         return __raw_readl(roff + AU1300_GPIC_PINVAL) & bit;
 38 }
 39 
 40 static inline int au1300_gpio_direction_input(unsigned int gpio)
 41 {
 42         void __iomem *roff = AU1300_GPIC_ADDR;
 43         unsigned long bit;
 44 
 45         gpio -= AU1300_GPIO_BASE;
 46 
 47         roff += GPIC_GPIO_BANKOFF(gpio);
 48         bit = GPIC_GPIO_TO_BIT(gpio);
 49         __raw_writel(bit, roff + AU1300_GPIC_DEVCLR);
 50         wmb();
 51 
 52         return 0;
 53 }
 54 
 55 static inline int au1300_gpio_set_value(unsigned int gpio, int v)
 56 {
 57         void __iomem *roff = AU1300_GPIC_ADDR;
 58         unsigned long bit;
 59 
 60         gpio -= AU1300_GPIO_BASE;
 61 
 62         roff += GPIC_GPIO_BANKOFF(gpio);
 63         bit = GPIC_GPIO_TO_BIT(gpio);
 64         __raw_writel(bit, roff + (v ? AU1300_GPIC_PINVAL
 65                                     : AU1300_GPIC_PINVALCLR));
 66         wmb();
 67 
 68         return 0;
 69 }
 70 
 71 static inline int au1300_gpio_direction_output(unsigned int gpio, int v)
 72 {
 73         /* hw switches to output automatically */
 74         return au1300_gpio_set_value(gpio, v);
 75 }
 76 
 77 static inline int au1300_gpio_to_irq(unsigned int gpio)
 78 {
 79         return AU1300_FIRST_INT + (gpio - AU1300_GPIO_BASE);
 80 }
 81 
 82 static inline int au1300_irq_to_gpio(unsigned int irq)
 83 {
 84         return (irq - AU1300_FIRST_INT) + AU1300_GPIO_BASE;
 85 }
 86 
 87 static inline int au1300_gpio_is_valid(unsigned int gpio)
 88 {
 89         int ret;
 90 
 91         switch (alchemy_get_cputype()) {
 92         case ALCHEMY_CPU_AU1300:
 93                 ret = ((gpio >= AU1300_GPIO_BASE) && (gpio <= AU1300_GPIO_MAX));
 94                 break;
 95         default:
 96                 ret = 0;
 97         }
 98         return ret;
 99 }
100 
101 static inline int au1300_gpio_cansleep(unsigned int gpio)
102 {
103         return 0;
104 }
105 
106 /* hardware remembers gpio 0-63 levels on powerup */
107 static inline int au1300_gpio_getinitlvl(unsigned int gpio)
108 {
109         void __iomem *roff = AU1300_GPIC_ADDR;
110         unsigned long v;
111 
112         if (unlikely(gpio > 63))
113                 return 0;
114         else if (gpio > 31) {
115                 gpio -= 32;
116                 roff += 4;
117         }
118 
119         v = __raw_readl(roff + AU1300_GPIC_RSTVAL);
120         return (v >> gpio) & 1;
121 }
122 
123 /**********************************************************************/
124 
125 /* Linux gpio framework integration.
126 *
127 * 4 use cases of Alchemy GPIOS:
128 *(1) GPIOLIB=y, ALCHEMY_GPIO_INDIRECT=y:
129 *       Board must register gpiochips.
130 *(2) GPIOLIB=y, ALCHEMY_GPIO_INDIRECT=n:
131 *       A gpiochip for the 75 GPIOs is registered.
132 *
133 *(3) GPIOLIB=n, ALCHEMY_GPIO_INDIRECT=y:
134 *       the boards' gpio.h must provide the linux gpio wrapper functions,
135 *
136 *(4) GPIOLIB=n, ALCHEMY_GPIO_INDIRECT=n:
137 *       inlinable gpio functions are provided which enable access to the
138 *       Au1300 gpios only by using the numbers straight out of the data-
139 *       sheets.
140 
141 * Cases 1 and 3 are intended for boards which want to provide their own
142 * GPIO namespace and -operations (i.e. for example you have 8 GPIOs
143 * which are in part provided by spare Au1300 GPIO pins and in part by
144 * an external FPGA but you still want them to be accessible in linux
145 * as gpio0-7. The board can of course use the alchemy_gpioX_* functions
146 * as required).
147 */
148 
149 #ifndef CONFIG_GPIOLIB
150 
151 #ifdef CONFIG_ALCHEMY_GPIOINT_AU1300
152 
153 #ifndef CONFIG_ALCHEMY_GPIO_INDIRECT    /* case (4) */
154 
155 static inline int gpio_direction_input(unsigned int gpio)
156 {
157         return au1300_gpio_direction_input(gpio);
158 }
159 
160 static inline int gpio_direction_output(unsigned int gpio, int v)
161 {
162         return au1300_gpio_direction_output(gpio, v);
163 }
164 
165 static inline int gpio_get_value(unsigned int gpio)
166 {
167         return au1300_gpio_get_value(gpio);
168 }
169 
170 static inline void gpio_set_value(unsigned int gpio, int v)
171 {
172         au1300_gpio_set_value(gpio, v);
173 }
174 
175 static inline int gpio_get_value_cansleep(unsigned gpio)
176 {
177         return gpio_get_value(gpio);
178 }
179 
180 static inline void gpio_set_value_cansleep(unsigned gpio, int value)
181 {
182         gpio_set_value(gpio, value);
183 }
184 
185 static inline int gpio_is_valid(unsigned int gpio)
186 {
187         return au1300_gpio_is_valid(gpio);
188 }
189 
190 static inline int gpio_cansleep(unsigned int gpio)
191 {
192         return au1300_gpio_cansleep(gpio);
193 }
194 
195 static inline int gpio_to_irq(unsigned int gpio)
196 {
197         return au1300_gpio_to_irq(gpio);
198 }
199 
200 static inline int irq_to_gpio(unsigned int irq)
201 {
202         return au1300_irq_to_gpio(irq);
203 }
204 
205 static inline int gpio_request(unsigned int gpio, const char *label)
206 {
207         return 0;
208 }
209 
210 static inline int gpio_request_one(unsigned gpio,
211                                         unsigned long flags, const char *label)
212 {
213         return 0;
214 }
215 
216 static inline int gpio_request_array(struct gpio *array, size_t num)
217 {
218         return 0;
219 }
220 
221 static inline void gpio_free(unsigned gpio)
222 {
223 }
224 
225 static inline void gpio_free_array(struct gpio *array, size_t num)
226 {
227 }
228 
229 static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
230 {
231         return -ENOSYS;
232 }
233 
234 static inline void gpio_unexport(unsigned gpio)
235 {
236 }
237 
238 static inline int gpio_export(unsigned gpio, bool direction_may_change)
239 {
240         return -ENOSYS;
241 }
242 
243 static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
244 {
245         return -ENOSYS;
246 }
247 
248 static inline int gpio_export_link(struct device *dev, const char *name,
249                                    unsigned gpio)
250 {
251         return -ENOSYS;
252 }
253 
254 #endif  /* !CONFIG_ALCHEMY_GPIO_INDIRECT */
255 
256 #endif  /* CONFIG_ALCHEMY_GPIOINT_AU1300 */
257 
258 #endif  /* CONFIG GPIOLIB */
259 
260 #endif /* _GPIO_AU1300_H_ */
261 

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