#include <machine/rtems-bsd-kernel-space.h>
/*
* Copyright (c) 2010
* Ben Gray <ben.r.gray@gmail.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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Ben Gray.
* 4. The name of the company nor the name of the author may be used to
* endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY BEN GRAY ``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 BEN GRAY 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.
*/
/**
* Exposes pinmux module to pinctrl-compatible interface
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <rtems/bsd/sys/resource.h>
#include <sys/rman.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/fdt/fdt_pinctrl.h>
#include <arm/ti/omap4/omap4_scm_padconf.h>
#include <arm/ti/am335x/am335x_scm_padconf.h>
#include <arm/ti/ti_cpuid.h>
#include "ti_pinmux.h"
struct pincfg {
uint32_t reg;
uint32_t conf;
};
static struct resource_spec ti_pinmux_res_spec[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE }, /* Control memory window */
{ -1, 0 }
};
static struct ti_pinmux_softc *ti_pinmux_sc;
#define ti_pinmux_read_2(sc, reg) \
bus_space_read_2((sc)->sc_bst, (sc)->sc_bsh, (reg))
#define ti_pinmux_write_2(sc, reg, val) \
bus_space_write_2((sc)->sc_bst, (sc)->sc_bsh, (reg), (val))
#define ti_pinmux_read_4(sc, reg) \
bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg))
#define ti_pinmux_write_4(sc, reg, val) \
bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val))
/**
* ti_padconf_devmap - Array of pins, should be defined one per SoC
*
* This array is typically defined in one of the targeted *_scm_pinumx.c
* files and is specific to the given SoC platform. Each entry in the array
* corresponds to an individual pin.
*/
static const struct ti_pinmux_device *ti_pinmux_dev;
/**
* ti_pinmux_padconf_from_name - searches the list of pads and returns entry
* with matching ball name.
* @ballname: the name of the ball
*
* RETURNS:
* A pointer to the matching padconf or NULL if the ball wasn't found.
*/
static const struct ti_pinmux_padconf*
ti_pinmux_padconf_from_name(const char *ballname)
{
const struct ti_pinmux_padconf *padconf;
padconf = ti_pinmux_dev->padconf;
while (padconf->ballname != NULL) {
if (strcmp(ballname, padconf->ballname) == 0)
return(padconf);
padconf++;
}
return (NULL);
}
/**
* ti_pinmux_padconf_set_internal - sets the muxmode and state for a pad/pin
* @padconf: pointer to the pad structure
* @muxmode: the name of the mode to use for the pin, i.e. "uart1_rx"
* @state: the state to put the pad/pin in, i.e. PADCONF_PIN_???
*
*
* LOCKING:
* Internally locks it's own context.
*
* RETURNS:
* 0 on success.
* EINVAL if pin requested is outside valid range or already in use.
*/
static int
ti_pinmux_padconf_set_internal(struct ti_pinmux_softc *sc,
const struct ti_pinmux_padconf *padconf,
const char *muxmode, unsigned int state)
{
unsigned int mode;
uint16_t reg_val;
/* populate the new value for the PADCONF register */
reg_val = (uint16_t)(state & ti_pinmux_dev->padconf_sate_mask);
/* find the new mode requested */
for (mode = 0; mode < 8; mode++) {
if ((padconf->muxmodes[mode] != NULL) &&
(strcmp(padconf->muxmodes[mode], muxmode) == 0)) {
break;
}
}
/* couldn't find the mux mode */
if (mode >= 8) {
printf("Invalid mode \"%s\"\n", muxmode);
return (EINVAL);
}
/* set the mux mode */
reg_val |= (uint16_t)(mode & ti_pinmux_dev->padconf_muxmode_mask);
if (bootverbose)
device_printf(sc->sc_dev, "setting internal %x for %s\n",
reg_val, muxmode);
/* write the register value (16-bit writes) */
ti_pinmux_write_2(sc, padconf->reg_off, reg_val);
return (0);
}
/**
* ti_pinmux_padconf_set - sets the muxmode and state for a pad/pin
* @padname: the name of the pad, i.e. "c12"
* @muxmode: the name of the mode to use for the pin, i.e. "uart1_rx"
* @state: the state to put the pad/pin in, i.e. PADCONF_PIN_???
*
*
* LOCKING:
* Internally locks it's own context.
*
* RETURNS:
* 0 on success.
* EINVAL if pin requested is outside valid range or already in use.
*/
int
ti_pinmux_padconf_set(const char *padname, const char *muxmode, unsigned int state)
{
const struct ti_pinmux_padconf *padconf;
if (!ti_pinmux_sc)
return (ENXIO);
/* find the pin in the devmap */
padconf = ti_pinmux_padconf_from_name(padname);
if (padconf == NULL)
return (EINVAL);
return (ti_pinmux_padconf_set_internal(ti_pinmux_sc, padconf, muxmode, state));
}
/**
* ti_pinmux_padconf_get - gets the muxmode and state for a pad/pin
* @padname: the name of the pad, i.e. "c12"
* @muxmode: upon return will contain the name of the muxmode of the pin
* @state: upon return will contain the state of the pad/pin
*
*
* LOCKING:
* Internally locks it's own context.
*
* RETURNS:
* 0 on success.
* EINVAL if pin requested is outside valid range or already in use.
*/
int
ti_pinmux_padconf_get(const char *padname, const char **muxmode,
unsigned int *state)
{
const struct ti_pinmux_padconf *padconf;
uint16_t reg_val;
if (!ti_pinmux_sc)
return (ENXIO);
/* find the pin in the devmap */
padconf = ti_pinmux_padconf_from_name(padname);
if (padconf == NULL)
return (EINVAL);
/* read the register value (16-bit reads) */
reg_val = ti_pinmux_read_2(ti_pinmux_sc, padconf->reg_off);
/* save the state */
if (state)
*state = (reg_val & ti_pinmux_dev->padconf_sate_mask);
/* save the mode */
if (muxmode)
*muxmode = padconf->muxmodes[(reg_val & ti_pinmux_dev->padconf_muxmode_mask)];
return (0);
}
/**
* ti_pinmux_padconf_set_gpiomode - converts a pad to GPIO mode.
* @gpio: the GPIO pin number (0-195)
* @state: the state to put the pad/pin in, i.e. PADCONF_PIN_???
*
*
*
* LOCKING:
* Internally locks it's own context.
*
* RETURNS:
* 0 on success.
* EINVAL if pin requested is outside valid range or already in use.
*/
int
ti_pinmux_padconf_set_gpiomode(uint32_t gpio, unsigned int state)
{
const struct ti_pinmux_padconf *padconf;
uint16_t reg_val;
if (!ti_pinmux_sc)
return (ENXIO);
/* find the gpio pin in the padconf array */
padconf = ti_pinmux_dev->padconf;
while (padconf->ballname != NULL) {
if (padconf->gpio_pin == gpio)
break;
padconf++;
}
if (padconf->ballname == NULL)
return (EINVAL);
/* populate the new value for the PADCONF register */
reg_val = (uint16_t)(state & ti_pinmux_dev->padconf_sate_mask);
/* set the mux mode */
reg_val |= (uint16_t)(padconf->gpio_mode & ti_pinmux_dev->padconf_muxmode_mask);
/* write the register value (16-bit writes) */
ti_pinmux_write_2(ti_pinmux_sc, padconf->reg_off, reg_val);
return (0);
}
/**
* ti_pinmux_padconf_get_gpiomode - gets the current GPIO mode of the pin
* @gpio: the GPIO pin number (0-195)
* @state: upon return will contain the state
*
*
*
* LOCKING:
* Internally locks it's own context.
*
* RETURNS:
* 0 on success.
* EINVAL if pin requested is outside valid range or not configured as GPIO.
*/
int
ti_pinmux_padconf_get_gpiomode(uint32_t gpio, unsigned int *state)
{
const struct ti_pinmux_padconf *padconf;
uint16_t reg_val;
if (!ti_pinmux_sc)
return (ENXIO);
/* find the gpio pin in the padconf array */
padconf = ti_pinmux_dev->padconf;
while (padconf->ballname != NULL) {
if (padconf->gpio_pin == gpio)
break;
padconf++;
}
if (padconf->ballname == NULL)
return (EINVAL);
/* read the current register settings */
reg_val = ti_pinmux_read_2(ti_pinmux_sc, padconf->reg_off);
/* check to make sure the pins is configured as GPIO in the first state */
if ((reg_val & ti_pinmux_dev->padconf_muxmode_mask) != padconf->gpio_mode)
return (EINVAL);
/* read and store the reset of the state, i.e. pull-up, pull-down, etc */
if (state)
*state = (reg_val & ti_pinmux_dev->padconf_sate_mask);
return (0);
}
static int
ti_pinmux_configure_pins(device_t dev, phandle_t cfgxref)
{
struct pincfg *cfgtuples, *cfg;
phandle_t cfgnode;
int i, ntuples;
static struct ti_pinmux_softc *sc;
sc = device_get_softc(dev);
cfgnode = OF_node_from_xref(cfgxref);
ntuples = OF_getencprop_alloc_multi(cfgnode, "pinctrl-single,pins",
sizeof(*cfgtuples), (void **)&cfgtuples);
if (ntuples < 0)
return (ENOENT);
if (ntuples == 0)
return (0); /* Empty property is not an error. */
for (i = 0, cfg = cfgtuples; i < ntuples; i++, cfg++) {
if (bootverbose) {
char name[32];
OF_getprop(cfgnode, "name", &name, sizeof(name));
printf("%16s: muxreg 0x%04x muxval 0x%02x\n",
name, cfg->reg, cfg->conf);
}
/* write the register value (16-bit writes) */
ti_pinmux_write_2(sc, cfg->reg, cfg->conf);
}
OF_prop_free(cfgtuples);
return (0);
}
/*
* Device part of OMAP SCM driver
*/
static int
ti_pinmux_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "pinctrl-single"))
return (ENXIO);
if (ti_pinmux_sc) {
printf("%s: multiple pinctrl modules in device tree data, ignoring\n",
__func__);
return (EEXIST);
}
switch (ti_chip()) {
#ifdef SOC_OMAP4
case CHIP_OMAP_4:
ti_pinmux_dev = &omap4_pinmux_dev;
break;
#endif
#ifdef SOC_TI_AM335X
case CHIP_AM335X:
ti_pinmux_dev = &ti_am335x_pinmux_dev;
break;
#endif
default:
printf("Unknown CPU in pinmux\n");
return (ENXIO);
}
device_set_desc(dev, "TI Pinmux Module");
return (BUS_PROBE_DEFAULT);
}
/**
* ti_pinmux_attach - attaches the pinmux to the simplebus
* @dev: new device
*
* RETURNS
* Zero on success or ENXIO if an error occuried.
*/
static int
ti_pinmux_attach(device_t dev)
{
struct ti_pinmux_softc *sc = device_get_softc(dev);
#if 0
if (ti_pinmux_sc)
return (ENXIO);
#endif
sc->sc_dev = dev;
if (bus_alloc_resources(dev, ti_pinmux_res_spec, sc->sc_res)) {
device_printf(dev, "could not allocate resources\n");
return (ENXIO);
}
sc->sc_bst = rman_get_bustag(sc->sc_res[0]);
sc->sc_bsh = rman_get_bushandle(sc->sc_res[0]);
if (ti_pinmux_sc == NULL)
ti_pinmux_sc = sc;
fdt_pinctrl_register(dev, "pinctrl-single,pins");
fdt_pinctrl_configure_tree(dev);
return (0);
}
static device_method_t ti_pinmux_methods[] = {
DEVMETHOD(device_probe, ti_pinmux_probe),
DEVMETHOD(device_attach, ti_pinmux_attach),
/* fdt_pinctrl interface */
DEVMETHOD(fdt_pinctrl_configure, ti_pinmux_configure_pins),
{ 0, 0 }
};
static driver_t ti_pinmux_driver = {
"ti_pinmux",
ti_pinmux_methods,
sizeof(struct ti_pinmux_softc),
};
static devclass_t ti_pinmux_devclass;
DRIVER_MODULE(ti_pinmux, simplebus, ti_pinmux_driver, ti_pinmux_devclass, 0, 0);
