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Add a function for adjusting the pin muxer in the GPIO block.

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(This should probably be revisited later.)
This commit is contained in:
jakllsch 2013-01-05 19:55:18 +00:00
parent 1dc05e277c
commit 4f7412af4d
4 changed files with 155 additions and 1 deletions
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69
sys/arch/arm/broadcom/bcm2835_gpio_subr.c Normal file
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@ -0,0 +1,69 @@
/* $NetBSD: bcm2835_gpio_subr.c,v 1.1 2013/01/05 19:55:18 jakllsch Exp $ */
/*
* Copyright (c) 2013 Jonathan A. Kollasch
* All rights reserved.
*
* 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: bcm2835_gpio_subr.c,v 1.1 2013/01/05 19:55:18 jakllsch Exp $");
#include <sys/param.h>
#include <sys/device.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/intr.h>
#include <arm/broadcom/bcm_amba.h>
#include <arm/broadcom/bcm2835reg.h>
#include <arm/broadcom/bcm2835_gpioreg.h>
#include <arm/broadcom/bcm2835_gpio_subr.h>
void
bcm2835gpio_function_select(u_int pin, u_int func)
{
const bus_space_tag_t iot = &bcm2835_bs_tag;
const bus_space_handle_t ioh = BCM2835_IOPHYSTOVIRT(BCM2835_GPIO_BASE);
const u_int mask = (1 << BCM2835_GPIO_GPFSEL_BITS_PER_PIN) - 1;
const u_int regid = (pin / BCM2835_GPIO_GPFSEL_PINS_PER_REGISTER);
const u_int shift = (pin % BCM2835_GPIO_GPFSEL_PINS_PER_REGISTER) *
BCM2835_GPIO_GPFSEL_BITS_PER_PIN;
uint32_t v;
KASSERT(func <= mask);
v = bus_space_read_4(iot, ioh, BCM2835_GPIO_GPFSEL(regid));
if (((v >> shift) & mask) == func) {
return;
}
aprint_verbose("bcm2835: changing FSEL%u to %#o\n", pin, func);
v &= ~(mask << shift);
v |= (func << shift);
bus_space_write_4(iot, ioh, BCM2835_GPIO_GPFSEL(regid), v);
}

36
sys/arch/arm/broadcom/bcm2835_gpio_subr.h Normal file
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/* $NetBSD: bcm2835_gpio_subr.h,v 1.1 2013/01/05 19:55:18 jakllsch Exp $ */
/*
* Copyright (c) 2013 Jonathan A. Kollasch
* All rights reserved.
*
* 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
*/
#ifndef _BROADCOM_BCM2835_GPIO_SUBR_H_
#define _BROADCOM_BCM2835_GPIO_SUBR_H_
#include <arm/broadcom/bcm2835_gpioreg.h>
void bcm2835gpio_function_select(u_int, u_int);
#endif /* _BROADCOM_BCM2835_GPIOVAR_H_ */

45
sys/arch/arm/broadcom/bcm2835_gpioreg.h Normal file
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/* $NetBSD: bcm2835_gpioreg.h,v 1.1 2013/01/05 19:55:18 jakllsch Exp $ */
/*
* Copyright (c) 2013 Jonathan A. Kollasch
* All rights reserved.
*
* 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
*/
#ifndef _BROADCOM_BCM2835_GPIOREG_H_
#define _BROADCOM_BCM2835_GPIOREG_H_
#define BCM2835_GPIO_GPFSEL(x) (0x000 + (x) * sizeof(uint32_t))
#define BCM2835_GPIO_GPFSEL_PINS_PER_REGISTER 10
#define BCM2835_GPIO_GPFSEL_BITS_PER_PIN 3
#define BCM2835_GPIO_IN 00
#define BCM2835_GPIO_OUT 01
#define BCM2835_GPIO_ALT5 02
#define BCM2835_GPIO_ALT4 03
#define BCM2835_GPIO_ALT0 04
#define BCM2835_GPIO_ALT1 05
#define BCM2835_GPIO_ALT2 06
#define BCM2835_GPIO_ALT3 07
#endif /* _BROADCOM_BCM2835_GPIOREG_H_ */

6
sys/arch/arm/broadcom/files.bcm2835
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@ -1,4 +1,4 @@
# $NetBSD: files.bcm2835,v 1.5 2012/08/22 13:21:31 jakllsch Exp $
# $NetBSD: files.bcm2835,v 1.6 2013/01/05 19:55:18 jakllsch Exp $
#
# Configuration info for Broadcom BCM2835 ARM Peripherals
#
@ -47,3 +47,7 @@ file arch/arm/broadcom/bcm2835_plcom.c bcmplcom
# External Mass Media Controller (BCM2835_EMMC_BASE)
attach sdhc at obio with bcmemmc
file arch/arm/broadcom/bcm2835_emmc.c bcmemmc
# GPIO misc. functions
define bcm2835_gpio_subr
file arch/arm/broadcom/bcm2835_gpio_subr.c bcm2835_gpio_subr