mirror/freebsd
1
0
Fork 0
mirror of https://git.FreeBSD.org/src.git synced 2025-01-17 15:27:36 +00:00
Code Issues Releases Activity

Export a function to allow BCM2835's peripheral devices to enable their

Browse Source 
altenate pin function (from GPIO pins) as needed.

Approved by:	adrian (mentor)
This commit is contained in:
Luiz Otavio O Souza 2013-09-07 18:48:15 +00:00
parent f7e6344d4a
commit 44d06d8d9a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=255370
2 changed files with 75 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

60
sys/arm/broadcom/bcm2835/bcm2835_gpio.c
View File

@ -52,6 +52,8 @@ __FBSDID("$FreeBSD$");
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <arm/broadcom/bcm2835/bcm2835_gpio.h>
#include "gpio_if.h"
#undef DEBUG
@ -87,17 +89,6 @@ struct bcm_gpio_softc {
struct bcm_gpio_sysctl sc_sysctl[BCM_GPIO_PINS];
};
enum bcm_gpio_fsel {
BCM_GPIO_INPUT,
BCM_GPIO_OUTPUT,
BCM_GPIO_ALT5,
BCM_GPIO_ALT4,
BCM_GPIO_ALT0,
BCM_GPIO_ALT1,
BCM_GPIO_ALT2,
BCM_GPIO_ALT3,
};
enum bcm_gpio_pud {
BCM_GPIO_NONE,
BCM_GPIO_PULLDOWN,
@ -257,6 +248,32 @@ bcm_gpio_set_pud(struct bcm_gpio_softc *sc, uint32_t pin, uint32_t state)
BCM_GPIO_WRITE(sc, BCM_GPIO_GPPUDCLK(bank), 0);
}
void
bcm_gpio_set_alternate(device_t dev, uint32_t pin, uint32_t nfunc)
{
struct bcm_gpio_softc *sc;
int i;
sc = device_get_softc(dev);
BCM_GPIO_LOCK(sc);
/* Disable pull-up or pull-down on pin. */
bcm_gpio_set_pud(sc, pin, BCM_GPIO_NONE);
/* And now set the pin function. */
bcm_gpio_set_function(sc, pin, nfunc);
/* Update the pin flags. */
for (i = 0; i < sc->sc_gpio_npins; i++) {
if (sc->sc_gpio_pins[i].gp_pin == pin)
break;
}
if (i < sc->sc_gpio_npins)
sc->sc_gpio_pins[i].gp_flags = bcm_gpio_func_flag(nfunc);
BCM_GPIO_UNLOCK(sc);
}
static void
bcm_gpio_pin_configure(struct bcm_gpio_softc *sc, struct gpio_pin *pin,
unsigned int flags)
@ -535,7 +552,7 @@ bcm_gpio_func_proc(SYSCTL_HANDLER_ARGS)
struct bcm_gpio_softc *sc;
struct bcm_gpio_sysctl *sc_sysctl;
uint32_t nfunc;
int i, error;
int error;
sc_sysctl = arg1;
sc = sc_sysctl->sc;
@ -552,23 +569,8 @@ bcm_gpio_func_proc(SYSCTL_HANDLER_ARGS)
if (bcm_gpio_str_func(buf, &nfunc) != 0)
return (EINVAL);
BCM_GPIO_LOCK(sc);
/* Disable pull-up or pull-down on pin. */
bcm_gpio_set_pud(sc, sc_sysctl->pin, BCM_GPIO_NONE);
/* And now set the pin function. */
bcm_gpio_set_function(sc, sc_sysctl->pin, nfunc);
/* Update the pin flags. */
for (i = 0; i < sc->sc_gpio_npins; i++) {
if (sc->sc_gpio_pins[i].gp_pin == sc_sysctl->pin)
break;
}
if (i < sc->sc_gpio_npins)
sc->sc_gpio_pins[i].gp_flags = bcm_gpio_func_flag(nfunc);
BCM_GPIO_UNLOCK(sc);
/* Update the pin alternate function. */
bcm_gpio_set_alternate(sc->sc_dev, sc_sysctl->pin, nfunc);
return (0);
}

44
sys/arm/broadcom/bcm2835/bcm2835_gpio.h Normal file
View File

@ -0,0 +1,44 @@
/*-
* Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@bluezbox.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _BCM2835_GPIO_H_
#define _BCM2835_GPIO_H_
enum bcm_gpio_fsel {
BCM_GPIO_INPUT,
BCM_GPIO_OUTPUT,
BCM_GPIO_ALT5,
BCM_GPIO_ALT4,
BCM_GPIO_ALT0,
BCM_GPIO_ALT1,
BCM_GPIO_ALT2,
BCM_GPIO_ALT3,
};
void bcm_gpio_set_alternate(device_t, uint32_t, uint32_t);
#endif /* _BCM2835_GPIO_H_ */