diff options
author | ian <ian@FreeBSD.org> | 2014-09-04 03:04:37 +0000 |
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committer | ian <ian@FreeBSD.org> | 2014-09-04 03:04:37 +0000 |
commit | a5645731d20064ece00afd48686fde8cf720f5f0 (patch) | |
tree | e19652d9f64e6363249dd967d3d1825accdcb33d /sys/arm/freescale | |
parent | 364a2ade67097f9b7c214368a35dda0e6f091644 (diff) | |
download | FreeBSD-src-a5645731d20064ece00afd48686fde8cf720f5f0.zip FreeBSD-src-a5645731d20064ece00afd48686fde8cf720f5f0.tar.gz |
The imx5x and imx6 chips have an onboard IOMUX device which also contains a
few "general purpose registers" whose values control chip behavior in ways
that have nothing to do with IO pin mux control. Define a simple API that
other soc-specific code can use to read and write the registers, and provide
the imx51 implementation of them.
Diffstat (limited to 'sys/arm/freescale')
-rw-r--r-- | sys/arm/freescale/imx/imx51_iomux.c | 36 | ||||
-rw-r--r-- | sys/arm/freescale/imx/imx_iomuxvar.h | 42 |
2 files changed, 78 insertions, 0 deletions
diff --git a/sys/arm/freescale/imx/imx51_iomux.c b/sys/arm/freescale/imx/imx51_iomux.c index 18738a1..0e64eb2 100644 --- a/sys/arm/freescale/imx/imx51_iomux.c +++ b/sys/arm/freescale/imx/imx51_iomux.c @@ -74,6 +74,7 @@ __FBSDID("$FreeBSD$"); #include <dev/ofw/ofw_bus.h> #include <dev/ofw/ofw_bus_subr.h> +#include <arm/freescale/imx/imx_iomuxvar.h> #include <arm/freescale/imx/imx51_iomuxvar.h> #include <arm/freescale/imx/imx51_iomuxreg.h> @@ -216,6 +217,41 @@ iomux_input_config(const struct iomux_input_conf *conflist) } #endif +uint32_t +imx_iomux_gpr_get(u_int regnum) +{ + + KASSERT(iomuxsc != NULL, ("imx_iomux_gpr_get() called before attach")); + KASSERT(regnum >= 0 && renum <= 1, + ("imx_iomux_gpr_get bad regnum %u", regnum)); + return (IOMUX_READ(iomuxsc, IOMUXC_GPR0 + regnum)); +} + +void +imx_iomux_gpr_set(u_int regnum, uint32_t val) +{ + + KASSERT(iomuxsc != NULL, ("imx_iomux_gpr_set() called before attach")); + KASSERT(regnum >= 0 && renum <= 1, + ("imx_iomux_gpr_set bad regnum %u", regnum)); + IOMUX_WRITE(iomuxsc, IOMUXC_GPR0 + regnum, val); +} + +void +imx_iomux_gpr_set_masked(u_int regnum, uint32_t clrbits, uint32_t setbits) +{ + uint32_t val; + + KASSERT(iomuxsc != NULL, + ("imx_iomux_gpr_set_masked called before attach")); + KASSERT(regnum >= 0 && renum <= 1, + ("imx_iomux_gpr_set_masked bad regnum %u", regnum)); + + val = IOMUX_READ(iomuxsc, IOMUXC_GPR0 + regnum); + val = (val & ~clrbits) | setbits; + IOMUX_WRITE(iomuxsc, IOMUXC_GPR0 + regnum, val); +} + static device_method_t imx_iomux_methods[] = { DEVMETHOD(device_probe, iomux_probe), DEVMETHOD(device_attach, iomux_attach), diff --git a/sys/arm/freescale/imx/imx_iomuxvar.h b/sys/arm/freescale/imx/imx_iomuxvar.h new file mode 100644 index 0000000..726328d --- /dev/null +++ b/sys/arm/freescale/imx/imx_iomuxvar.h @@ -0,0 +1,42 @@ +/*- + * Copyright (c) 2014 Ian Lepore <ian@freebsd.org> + * 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 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 IMX_IOMUXVAR_H +#define IMX_IOMUXVAR_H + +/* + * The IOMUX Controller device has a small set of "general purpose registers" + * which control various aspects of SoC operation that really have nothing to do + * with IO pin assignments or pad control. These functions let other soc level + * code manipulate these values. + */ +uint32_t imx_iomux_gpr_get(u_int regnum); +void imx_iomux_gpr_set(u_int regnum, uint32_t val); +void imx_iomux_gpr_set_masked(u_int regnum, uint32_t clrbits, uint32_t setbits); + +#endif |