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freebsd-skq/sys/arm/amlogic/aml8726/aml8726_pinctrl.c
gonzo 1252c9346c Clean up OF_getprop_alloc API 
OF_getprop_alloc takes element size argument and returns number of
elements in the property. There are valid use cases for such behavior
but mostly API consumers pass 1 as element size to get string
properties. What API users would expect from OF_getprop_alloc is to be
a combination of malloc + OF_getprop with the same semantic of return
value. This patch modifies API signature to match these expectations.

For the valid use cases with element size != 1 and to reduce
modification scope new OF_getprop_alloc_multi function has been
introduced that behaves the same way OF_getprop_alloc behaved prior to
this patch.

Reviewed by:	ian, manu
Differential Revision:	https://reviews.freebsd.org/D14850
2018-04-08 22:59:34 +00:00

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/*-
* Copyright 2015 John Wehle <john@feith.com>
* 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.
*/
/*
* Amlogic aml8726 pinctrl driver.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/resource.h>
#include <sys/rman.h>
#include <machine/bus.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/fdt/fdt_pinctrl.h>
#include <arm/amlogic/aml8726/aml8726_soc.h>
#include <arm/amlogic/aml8726/aml8726_pinctrl.h>
struct aml8726_pinctrl_softc {
device_t dev;
struct {
struct aml8726_pinctrl_function *func;
struct aml8726_pinctrl_pkg_pin *ppin;
boolean_t pud_ctrl;
} soc;
struct resource *res[6];
struct mtx mtx;
};
static struct resource_spec aml8726_pinctrl_spec[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE }, /* mux */
{ SYS_RES_MEMORY, 1, RF_ACTIVE | RF_SHAREABLE }, /* pu/pd */
{ SYS_RES_MEMORY, 2, RF_ACTIVE | RF_SHAREABLE }, /* pull enable */
{ SYS_RES_MEMORY, 3, RF_ACTIVE }, /* ao mux */
{ SYS_RES_MEMORY, 4, RF_ACTIVE | RF_SHAREABLE }, /* ao pu/pd */
{ SYS_RES_MEMORY, 5, RF_ACTIVE | RF_SHAREABLE }, /* ao pull enable */
{ -1, 0 }
};
#define AML_PINCTRL_LOCK(sc) mtx_lock(&(sc)->mtx)
#define AML_PINCTRL_UNLOCK(sc) mtx_unlock(&(sc)->mtx)
#define AML_PINCTRL_LOCK_INIT(sc) \
mtx_init(&(sc)->mtx, device_get_nameunit((sc)->dev), \
"pinctrl", MTX_DEF)
#define AML_PINCTRL_LOCK_DESTROY(sc) mtx_destroy(&(sc)->mtx);
#define MUX_WRITE_4(sc, reg, val) bus_write_4((sc)->res[0], reg, (val))
#define MUX_READ_4(sc, reg) bus_read_4((sc)->res[0], reg)
#define PUD_WRITE_4(sc, reg, val) bus_write_4((sc)->res[1], reg, (val))
#define PUD_READ_4(sc, reg) bus_read_4((sc)->res[1], reg)
#define PEN_WRITE_4(sc, reg, val) bus_write_4((sc)->res[2], reg, (val))
#define PEN_READ_4(sc, reg) bus_read_4((sc)->res[2], reg)
#define AOMUX_WRITE_4(sc, reg, val) bus_write_4((sc)->res[3], reg, (val))
#define AOMUX_READ_4(sc, reg) bus_read_4((sc)->res[3], reg)
#define AOPUD_WRITE_4(sc, reg, val) bus_write_4((sc)->res[4], reg, (val))
#define AOPUD_READ_4(sc, reg) bus_read_4((sc)->res[4], reg)
#define AOPEN_WRITE_4(sc, reg, val) bus_write_4((sc)->res[5], reg, (val))
#define AOPEN_READ_4(sc, reg) bus_read_4((sc)->res[5], reg)
static int
aml8726_pinctrl_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "amlogic,aml8726-pinctrl"))
return (ENXIO);
device_set_desc(dev, "Amlogic aml8726 pinctrl");
return (BUS_PROBE_DEFAULT);
}
static int
aml8726_pinctrl_attach(device_t dev)
{
struct aml8726_pinctrl_softc *sc = device_get_softc(dev);
sc->dev = dev;
sc->soc.pud_ctrl = false;
switch (aml8726_soc_hw_rev) {
case AML_SOC_HW_REV_M3:
sc->soc.func = aml8726_m3_pinctrl;
sc->soc.ppin = aml8726_m3_pkg_pin;
break;
case AML_SOC_HW_REV_M6:
sc->soc.func = aml8726_m6_pinctrl;
sc->soc.ppin = aml8726_m6_pkg_pin;
break;
case AML_SOC_HW_REV_M8:
sc->soc.func = aml8726_m8_pinctrl;
sc->soc.ppin = aml8726_m8_pkg_pin;
sc->soc.pud_ctrl = true;
break;
case AML_SOC_HW_REV_M8B:
sc->soc.func = aml8726_m8b_pinctrl;
sc->soc.ppin = aml8726_m8b_pkg_pin;
sc->soc.pud_ctrl = true;
break;
default:
device_printf(dev, "unsupported SoC\n");
return (ENXIO);
/* NOTREACHED */
}
if (bus_alloc_resources(dev, aml8726_pinctrl_spec, sc->res)) {
device_printf(dev, "could not allocate resources for device\n");
return (ENXIO);
}
AML_PINCTRL_LOCK_INIT(sc);
fdt_pinctrl_register(dev, "amlogic,pins");
fdt_pinctrl_configure_tree(dev);
return (0);
}
static int
aml8726_pinctrl_detach(device_t dev)
{
struct aml8726_pinctrl_softc *sc = device_get_softc(dev);
AML_PINCTRL_LOCK_DESTROY(sc);
bus_release_resources(dev, aml8726_pinctrl_spec, sc->res);
return (0);
}
static int
aml8726_pinctrl_configure_pins(device_t dev, phandle_t cfgxref)
{
struct aml8726_pinctrl_softc *sc = device_get_softc(dev);
struct aml8726_pinctrl_function *cf;
struct aml8726_pinctrl_function *f;
struct aml8726_pinctrl_pkg_pin *pp;
struct aml8726_pinctrl_pin *cp;
struct aml8726_pinctrl_pin *p;
enum aml8726_pinctrl_pull_mode pm;
char *function_name;
char *pins;
char *pin_name;
char *pull;
phandle_t node;
ssize_t len;
uint32_t value;
node = OF_node_from_xref(cfgxref);
len = OF_getprop_alloc(node, "amlogic,function",
(void **)&function_name);
if (len < 0) {
device_printf(dev,
"missing amlogic,function attribute in FDT\n");
return (ENXIO);
}
for (f = sc->soc.func; f->name != NULL; f++)
if (strncmp(f->name, function_name, len) == 0)
break;
if (f->name == NULL) {
device_printf(dev, "unknown function attribute %.*s in FDT\n",
len, function_name);
OF_prop_free(function_name);
return (ENXIO);
}
OF_prop_free(function_name);
len = OF_getprop_alloc(node, "amlogic,pull",
(void **)&pull);
pm = aml8726_unknown_pm;
if (len > 0) {
if (strncmp(pull, "enable", len) == 0)
pm = aml8726_enable_pm;
else if (strncmp(pull, "disable", len) == 0)
pm = aml8726_disable_pm;
else if (strncmp(pull, "down", len) == 0)
pm = aml8726_enable_down_pm;
else if (strncmp(pull, "up", len) == 0)
pm = aml8726_enable_up_pm;
else {
device_printf(dev,
"unknown pull attribute %.*s in FDT\n",
len, pull);
OF_prop_free(pull);
return (ENXIO);
}
}
OF_prop_free(pull);
/*
* Setting the pull direction isn't supported on all SoC.
*/
switch (pm) {
case aml8726_enable_down_pm:
case aml8726_enable_up_pm:
if (sc->soc.pud_ctrl == false) {
device_printf(dev,
"SoC doesn't support setting pull direction.\n");
return (ENXIO);
}
break;
default:
break;
}
len = OF_getprop_alloc(node, "amlogic,pins",
(void **)&pins);
if (len < 0) {
device_printf(dev, "missing amlogic,pins attribute in FDT\n");
return (ENXIO);
}
pin_name = pins;
while (len) {
for (p = f->pins; p->name != NULL; p++)
if (strncmp(p->name, pin_name, len) == 0)
break;
if (p->name == NULL) {
/* display message prior to queuing up next string */
device_printf(dev, "unknown pin attribute %.*s in FDT\n",
len, pin_name);
}
/* queue up next string */
while (*pin_name && len) {
pin_name++;
len--;
}
if (len) {
pin_name++;
len--;
}
if (p->name == NULL)
continue;
for (pp = sc->soc.ppin; pp->pkg_name != NULL; pp++)
if (strcmp(pp->pkg_name, p->pkg_name) == 0)
break;
if (pp->pkg_name == NULL) {
device_printf(dev,
"missing entry for package pin %s\n",
p->pkg_name);
continue;
}
if (pm != aml8726_unknown_pm && pp->pull_bits == 0x00000000) {
device_printf(dev,
"missing pull info for package pin %s\n",
p->pkg_name);
continue;
}
AML_PINCTRL_LOCK(sc);
/*
* First clear all other mux bits associated with this
* package pin. This may briefly configure the pin as
* GPIO ... however this should be fine since after
* reset the default GPIO mode is input.
*/
for (cf = sc->soc.func; cf->name != NULL; cf++)
for (cp = cf->pins; cp->name != NULL; cp++) {
if (cp == p)
continue;
if (strcmp(cp->pkg_name, p->pkg_name) != 0)
continue;
if (cp->mux_bits == 0)
continue;
if (pp->aobus == false) {
value = MUX_READ_4(sc, cp->mux_addr);
value &= ~cp->mux_bits;
MUX_WRITE_4(sc, cp->mux_addr, value);
} else {
value = AOMUX_READ_4(sc, cp->mux_addr);
value &= ~cp->mux_bits;
AOMUX_WRITE_4(sc, cp->mux_addr, value);
}
}
/*
* Now set the desired mux bits.
*
* In the case of GPIO there's no bits to set.
*/
if (p->mux_bits != 0) {
if (pp->aobus == false) {
value = MUX_READ_4(sc, p->mux_addr);
value |= p->mux_bits;
MUX_WRITE_4(sc, p->mux_addr, value);
} else {
value = AOMUX_READ_4(sc, p->mux_addr);
value |= p->mux_bits;
AOMUX_WRITE_4(sc, p->mux_addr, value);
}
}
/*
* Finally set the pull mode if it was specified.
*/
switch (pm) {
case aml8726_enable_down_pm:
case aml8726_enable_up_pm:
if (pp->aobus == false) {
value = PUD_READ_4(sc, pp->pull_addr);
if (pm == aml8726_enable_down_pm)
value &= ~pp->pull_bits;
else
value |= pp->pull_bits;
PUD_WRITE_4(sc, pp->pull_addr, value);
} else {
value = AOPUD_READ_4(sc, pp->pull_addr);
if (pm == aml8726_enable_down_pm)
value &= ~(pp->pull_bits << 16);
else
value |= (pp->pull_bits << 16);
AOPUD_WRITE_4(sc, pp->pull_addr, value);
}
/* FALLTHROUGH */
case aml8726_disable_pm:
case aml8726_enable_pm:
if (pp->aobus == false) {
value = PEN_READ_4(sc, pp->pull_addr);
if (pm == aml8726_disable_pm)
value &= ~pp->pull_bits;
else
value |= pp->pull_bits;
PEN_WRITE_4(sc, pp->pull_addr, value);
} else {
value = AOPEN_READ_4(sc, pp->pull_addr);
if (pm == aml8726_disable_pm)
value &= ~pp->pull_bits;
else
value |= pp->pull_bits;
AOPEN_WRITE_4(sc, pp->pull_addr, value);
}
break;
default:
break;
}
AML_PINCTRL_UNLOCK(sc);
}
OF_prop_free(pins);
return (0);
}
static device_method_t aml8726_pinctrl_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, aml8726_pinctrl_probe),
DEVMETHOD(device_attach, aml8726_pinctrl_attach),
DEVMETHOD(device_detach, aml8726_pinctrl_detach),
/* fdt_pinctrl interface */
DEVMETHOD(fdt_pinctrl_configure,aml8726_pinctrl_configure_pins),
DEVMETHOD_END
};
static driver_t aml8726_pinctrl_driver = {
"pinctrl",
aml8726_pinctrl_methods,
sizeof(struct aml8726_pinctrl_softc),
};
static devclass_t aml8726_pinctrl_devclass;
EARLY_DRIVER_MODULE(pinctrl, simplebus, aml8726_pinctrl_driver,
aml8726_pinctrl_devclass, 0, 0, BUS_PASS_CPU + BUS_PASS_ORDER_LATE);
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