2 * Copyright (c) 2009 Wind River Systems, Inc.
3 * Tom Rix <Tom.Rix@windriver.com>
5 * SPDX-License-Identifier: GPL-2.0
7 * This work is derived from the linux 2.6.27 kernel source
8 * To fetch, use the kernel repository
9 * git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
10 * Use the v2.6.27 tag.
12 * Below is the original's header including its copyright
14 * linux/arch/arm/plat-omap/gpio.c
16 * Support functions for OMAP GPIO
18 * Copyright (C) 2003-2005 Nokia Corporation
19 * Written by Juha Yrjölä <juha.yrjola@nokia.com>
26 #include <linux/errno.h>
29 DECLARE_GLOBAL_DATA_PTR
;
31 #define OMAP_GPIO_DIR_OUT 0
32 #define OMAP_GPIO_DIR_IN 1
36 #define GPIO_PER_BANK 32
39 /* TODO(sjg@chromium.org): Can we use a struct here? */
40 void *base
; /* address of registers in physical memory */
45 static inline int get_gpio_index(int gpio
)
50 int gpio_is_valid(int gpio
)
52 return (gpio
>= 0) && (gpio
< OMAP_MAX_GPIO
);
55 static void _set_gpio_direction(const struct gpio_bank
*bank
, int gpio
,
58 void *reg
= bank
->base
;
72 * Get the direction of the GPIO by reading the GPIO_OE register
73 * corresponding to the specified bank.
75 static int _get_gpio_direction(const struct gpio_bank
*bank
, int gpio
)
77 void *reg
= bank
->base
;
85 return OMAP_GPIO_DIR_IN
;
87 return OMAP_GPIO_DIR_OUT
;
90 static void _set_gpio_dataout(const struct gpio_bank
*bank
, int gpio
,
93 void *reg
= bank
->base
;
97 reg
+= OMAP_GPIO_SETDATAOUT
;
99 reg
+= OMAP_GPIO_CLEARDATAOUT
;
102 __raw_writel(l
, reg
);
105 static int _get_gpio_value(const struct gpio_bank
*bank
, int gpio
)
107 void *reg
= bank
->base
;
110 input
= _get_gpio_direction(bank
, gpio
);
112 case OMAP_GPIO_DIR_IN
:
113 reg
+= OMAP_GPIO_DATAIN
;
115 case OMAP_GPIO_DIR_OUT
:
116 reg
+= OMAP_GPIO_DATAOUT
;
122 return (__raw_readl(reg
) & (1 << gpio
)) != 0;
125 #ifndef CONFIG_DM_GPIO
127 static inline const struct gpio_bank
*get_gpio_bank(int gpio
)
129 return &omap_gpio_bank
[gpio
>> 5];
132 static int check_gpio(int gpio
)
134 if (!gpio_is_valid(gpio
)) {
135 printf("ERROR : check_gpio: invalid GPIO %d\n", gpio
);
142 * Set value of the specified gpio
144 int gpio_set_value(unsigned gpio
, int value
)
146 const struct gpio_bank
*bank
;
148 if (check_gpio(gpio
) < 0)
150 bank
= get_gpio_bank(gpio
);
151 _set_gpio_dataout(bank
, get_gpio_index(gpio
), value
);
157 * Get value of the specified gpio
159 int gpio_get_value(unsigned gpio
)
161 const struct gpio_bank
*bank
;
163 if (check_gpio(gpio
) < 0)
165 bank
= get_gpio_bank(gpio
);
167 return _get_gpio_value(bank
, get_gpio_index(gpio
));
171 * Set gpio direction as input
173 int gpio_direction_input(unsigned gpio
)
175 const struct gpio_bank
*bank
;
177 if (check_gpio(gpio
) < 0)
180 bank
= get_gpio_bank(gpio
);
181 _set_gpio_direction(bank
, get_gpio_index(gpio
), 1);
187 * Set gpio direction as output
189 int gpio_direction_output(unsigned gpio
, int value
)
191 const struct gpio_bank
*bank
;
193 if (check_gpio(gpio
) < 0)
196 bank
= get_gpio_bank(gpio
);
197 _set_gpio_dataout(bank
, get_gpio_index(gpio
), value
);
198 _set_gpio_direction(bank
, get_gpio_index(gpio
), 0);
204 * Request a gpio before using it.
206 * NOTE: Argument 'label' is unused.
208 int gpio_request(unsigned gpio
, const char *label
)
210 if (check_gpio(gpio
) < 0)
217 * Reset and free the gpio after using it.
219 int gpio_free(unsigned gpio
)
224 #else /* new driver model interface CONFIG_DM_GPIO */
226 /* set GPIO pin 'gpio' as an input */
227 static int omap_gpio_direction_input(struct udevice
*dev
, unsigned offset
)
229 struct gpio_bank
*bank
= dev_get_priv(dev
);
231 /* Configure GPIO direction as input. */
232 _set_gpio_direction(bank
, offset
, 1);
237 /* set GPIO pin 'gpio' as an output, with polarity 'value' */
238 static int omap_gpio_direction_output(struct udevice
*dev
, unsigned offset
,
241 struct gpio_bank
*bank
= dev_get_priv(dev
);
243 _set_gpio_dataout(bank
, offset
, value
);
244 _set_gpio_direction(bank
, offset
, 0);
249 /* read GPIO IN value of pin 'gpio' */
250 static int omap_gpio_get_value(struct udevice
*dev
, unsigned offset
)
252 struct gpio_bank
*bank
= dev_get_priv(dev
);
254 return _get_gpio_value(bank
, offset
);
257 /* write GPIO OUT value to pin 'gpio' */
258 static int omap_gpio_set_value(struct udevice
*dev
, unsigned offset
,
261 struct gpio_bank
*bank
= dev_get_priv(dev
);
263 _set_gpio_dataout(bank
, offset
, value
);
268 static int omap_gpio_get_function(struct udevice
*dev
, unsigned offset
)
270 struct gpio_bank
*bank
= dev_get_priv(dev
);
272 /* GPIOF_FUNC is not implemented yet */
273 if (_get_gpio_direction(bank
, offset
) == OMAP_GPIO_DIR_OUT
)
279 static const struct dm_gpio_ops gpio_omap_ops
= {
280 .direction_input
= omap_gpio_direction_input
,
281 .direction_output
= omap_gpio_direction_output
,
282 .get_value
= omap_gpio_get_value
,
283 .set_value
= omap_gpio_set_value
,
284 .get_function
= omap_gpio_get_function
,
287 static int omap_gpio_probe(struct udevice
*dev
)
289 struct gpio_bank
*bank
= dev_get_priv(dev
);
290 struct omap_gpio_platdata
*plat
= dev_get_platdata(dev
);
291 struct gpio_dev_priv
*uc_priv
= dev_get_uclass_priv(dev
);
293 uc_priv
->bank_name
= plat
->port_name
;
294 uc_priv
->gpio_count
= GPIO_PER_BANK
;
295 bank
->base
= (void *)plat
->base
;
300 static int omap_gpio_bind(struct udevice
*dev
)
302 struct omap_gpio_platdata
*plat
= dev_get_platdata(dev
);
303 fdt_addr_t base_addr
;
308 base_addr
= devfdt_get_addr(dev
);
309 if (base_addr
== FDT_ADDR_T_NONE
)
314 * When every board is converted to driver model and DT is
315 * supported, this can be done by auto-alloc feature, but
316 * not using calloc to alloc memory for platdata.
318 * For example am33xx_gpio uses platform data rather than device tree.
320 * NOTE: DO NOT COPY this code if you are using device tree.
322 plat
= calloc(1, sizeof(*plat
));
326 plat
->base
= base_addr
;
327 plat
->port_name
= fdt_get_name(gd
->fdt_blob
, dev_of_offset(dev
), NULL
);
328 dev
->platdata
= plat
;
333 static const struct udevice_id omap_gpio_ids
[] = {
334 { .compatible
= "ti,omap3-gpio" },
335 { .compatible
= "ti,omap4-gpio" },
336 { .compatible
= "ti,am4372-gpio" },
340 U_BOOT_DRIVER(gpio_omap
) = {
343 .ops
= &gpio_omap_ops
,
344 .of_match
= omap_gpio_ids
,
345 .bind
= omap_gpio_bind
,
346 .probe
= omap_gpio_probe
,
347 .priv_auto_alloc_size
= sizeof(struct gpio_bank
),
350 #endif /* CONFIG_DM_GPIO */