6489412064
really need it. That would be almost everywhere it was included. Add it in a couple files that really do need it and were previously getting it by accident via another header.
500 lines
13 KiB
C
500 lines
13 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
/**
|
|
* SCM - System Control Module
|
|
*
|
|
* Hopefully in the end this module will contain a bunch of utility functions
|
|
* for configuring and querying the general system control registers, but for
|
|
* now it only does pin(pad) multiplexing.
|
|
*
|
|
* This is different from the GPIO module in that it is used to configure the
|
|
* pins between modules not just GPIO input/output.
|
|
*
|
|
* This file contains the generic top level driver, however it relies on chip
|
|
* specific settings and therefore expects an array of ti_scm_padconf structs
|
|
* call ti_padconf_devmap to be located somewhere in the kernel.
|
|
*
|
|
*/
|
|
#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 <sys/resource.h>
|
|
#include <sys/rman.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
|
|
#include <machine/bus.h>
|
|
#include <machine/cpu.h>
|
|
#include <machine/cpufunc.h>
|
|
#include <machine/resource.h>
|
|
|
|
#include <dev/fdt/fdt_common.h>
|
|
#include <dev/ofw/openfirm.h>
|
|
#include <dev/ofw/ofw_bus.h>
|
|
#include <dev/ofw/ofw_bus_subr.h>
|
|
|
|
#include "ti_scm.h"
|
|
|
|
static struct resource_spec ti_scm_res_spec[] = {
|
|
{ SYS_RES_MEMORY, 0, RF_ACTIVE }, /* Control memory window */
|
|
{ -1, 0 }
|
|
};
|
|
|
|
static struct ti_scm_softc *ti_scm_sc;
|
|
|
|
#define ti_scm_read_2(sc, reg) \
|
|
bus_space_read_2((sc)->sc_bst, (sc)->sc_bsh, (reg))
|
|
#define ti_scm_write_2(sc, reg, val) \
|
|
bus_space_write_2((sc)->sc_bst, (sc)->sc_bsh, (reg), (val))
|
|
#define ti_scm_read_4(sc, reg) \
|
|
bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg))
|
|
#define ti_scm_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.
|
|
*/
|
|
extern const struct ti_scm_device ti_scm_dev;
|
|
|
|
|
|
/**
|
|
* ti_scm_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_scm_padconf*
|
|
ti_scm_padconf_from_name(const char *ballname)
|
|
{
|
|
const struct ti_scm_padconf *padconf;
|
|
|
|
padconf = ti_scm_dev.padconf;
|
|
while (padconf->ballname != NULL) {
|
|
if (strcmp(ballname, padconf->ballname) == 0)
|
|
return(padconf);
|
|
padconf++;
|
|
}
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
/**
|
|
* ti_scm_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_scm_padconf_set_internal(struct ti_scm_softc *sc,
|
|
const struct ti_scm_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_scm_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_scm_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_scm_write_2(sc, padconf->reg_off, reg_val);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/**
|
|
* ti_scm_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_scm_padconf_set(const char *padname, const char *muxmode, unsigned int state)
|
|
{
|
|
const struct ti_scm_padconf *padconf;
|
|
|
|
if (!ti_scm_sc)
|
|
return (ENXIO);
|
|
|
|
/* find the pin in the devmap */
|
|
padconf = ti_scm_padconf_from_name(padname);
|
|
if (padconf == NULL)
|
|
return (EINVAL);
|
|
|
|
return (ti_scm_padconf_set_internal(ti_scm_sc, padconf, muxmode, state));
|
|
}
|
|
|
|
/**
|
|
* ti_scm_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_scm_padconf_get(const char *padname, const char **muxmode,
|
|
unsigned int *state)
|
|
{
|
|
const struct ti_scm_padconf *padconf;
|
|
uint16_t reg_val;
|
|
|
|
if (!ti_scm_sc)
|
|
return (ENXIO);
|
|
|
|
/* find the pin in the devmap */
|
|
padconf = ti_scm_padconf_from_name(padname);
|
|
if (padconf == NULL)
|
|
return (EINVAL);
|
|
|
|
/* read the register value (16-bit reads) */
|
|
reg_val = ti_scm_read_2(ti_scm_sc, padconf->reg_off);
|
|
|
|
/* save the state */
|
|
if (state)
|
|
*state = (reg_val & ti_scm_dev.padconf_sate_mask);
|
|
|
|
/* save the mode */
|
|
if (muxmode)
|
|
*muxmode = padconf->muxmodes[(reg_val & ti_scm_dev.padconf_muxmode_mask)];
|
|
|
|
return (0);
|
|
}
|
|
|
|
/**
|
|
* ti_scm_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_scm_padconf_set_gpiomode(uint32_t gpio, unsigned int state)
|
|
{
|
|
const struct ti_scm_padconf *padconf;
|
|
uint16_t reg_val;
|
|
|
|
if (!ti_scm_sc)
|
|
return (ENXIO);
|
|
|
|
/* find the gpio pin in the padconf array */
|
|
padconf = ti_scm_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_scm_dev.padconf_sate_mask);
|
|
|
|
/* set the mux mode */
|
|
reg_val |= (uint16_t)(padconf->gpio_mode & ti_scm_dev.padconf_muxmode_mask);
|
|
|
|
/* write the register value (16-bit writes) */
|
|
ti_scm_write_2(ti_scm_sc, padconf->reg_off, reg_val);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/**
|
|
* ti_scm_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_scm_padconf_get_gpiomode(uint32_t gpio, unsigned int *state)
|
|
{
|
|
const struct ti_scm_padconf *padconf;
|
|
uint16_t reg_val;
|
|
|
|
if (!ti_scm_sc)
|
|
return (ENXIO);
|
|
|
|
/* find the gpio pin in the padconf array */
|
|
padconf = ti_scm_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_scm_read_2(ti_scm_sc, padconf->reg_off);
|
|
|
|
/* check to make sure the pins is configured as GPIO in the first state */
|
|
if ((reg_val & ti_scm_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_scm_dev.padconf_sate_mask);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/**
|
|
* ti_scm_padconf_init_from_hints - processes the hints for padconf
|
|
* @sc: the driver soft context
|
|
*
|
|
*
|
|
*
|
|
* 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_scm_padconf_init_from_fdt(struct ti_scm_softc *sc)
|
|
{
|
|
const struct ti_scm_padconf *padconf;
|
|
const struct ti_scm_padstate *padstates;
|
|
int err;
|
|
phandle_t node;
|
|
int len;
|
|
char *fdt_pad_config;
|
|
int i;
|
|
char *padname, *muxname, *padstate;
|
|
|
|
node = ofw_bus_get_node(sc->sc_dev);
|
|
len = OF_getproplen(node, "scm-pad-config");
|
|
OF_getprop_alloc(node, "scm-pad-config", 1, (void **)&fdt_pad_config);
|
|
|
|
i = len;
|
|
while (i > 0) {
|
|
padname = fdt_pad_config;
|
|
fdt_pad_config += strlen(padname) + 1;
|
|
i -= strlen(padname) + 1;
|
|
if (i <= 0)
|
|
break;
|
|
|
|
muxname = fdt_pad_config;
|
|
fdt_pad_config += strlen(muxname) + 1;
|
|
i -= strlen(muxname) + 1;
|
|
if (i <= 0)
|
|
break;
|
|
|
|
padstate = fdt_pad_config;
|
|
fdt_pad_config += strlen(padstate) + 1;
|
|
i -= strlen(padstate) + 1;
|
|
if (i < 0)
|
|
break;
|
|
|
|
padconf = ti_scm_dev.padconf;
|
|
|
|
while (padconf->ballname != NULL) {
|
|
if (strcmp(padconf->ballname, padname) == 0) {
|
|
padstates = ti_scm_dev.padstate;
|
|
err = 1;
|
|
while (padstates->state != NULL) {
|
|
if (strcmp(padstates->state, padstate) == 0) {
|
|
err = ti_scm_padconf_set_internal(sc,
|
|
padconf, muxname, padstates->reg);
|
|
}
|
|
padstates++;
|
|
}
|
|
if (err)
|
|
device_printf(sc->sc_dev,
|
|
"err: failed to configure "
|
|
"pin \"%s\" as \"%s\"\n",
|
|
padconf->ballname,
|
|
muxname);
|
|
}
|
|
padconf++;
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Device part of OMAP SCM driver
|
|
*/
|
|
|
|
static int
|
|
ti_scm_probe(device_t dev)
|
|
{
|
|
if (!ofw_bus_is_compatible(dev, "ti,scm"))
|
|
return (ENXIO);
|
|
|
|
device_set_desc(dev, "TI Control Module");
|
|
return (BUS_PROBE_DEFAULT);
|
|
}
|
|
|
|
/**
|
|
* ti_scm_attach - attaches the timer to the simplebus
|
|
* @dev: new device
|
|
*
|
|
* Reserves memory and interrupt resources, stores the softc structure
|
|
* globally and registers both the timecount and eventtimer objects.
|
|
*
|
|
* RETURNS
|
|
* Zero on sucess or ENXIO if an error occuried.
|
|
*/
|
|
static int
|
|
ti_scm_attach(device_t dev)
|
|
{
|
|
struct ti_scm_softc *sc = device_get_softc(dev);
|
|
|
|
if (ti_scm_sc)
|
|
return (ENXIO);
|
|
|
|
sc->sc_dev = dev;
|
|
|
|
if (bus_alloc_resources(dev, ti_scm_res_spec, sc->sc_res)) {
|
|
device_printf(dev, "could not allocate resources\n");
|
|
return (ENXIO);
|
|
}
|
|
|
|
/* Global timer interface */
|
|
sc->sc_bst = rman_get_bustag(sc->sc_res[0]);
|
|
sc->sc_bsh = rman_get_bushandle(sc->sc_res[0]);
|
|
|
|
ti_scm_sc = sc;
|
|
|
|
ti_scm_padconf_init_from_fdt(sc);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
ti_scm_reg_read_4(uint32_t reg, uint32_t *val)
|
|
{
|
|
if (!ti_scm_sc)
|
|
return (ENXIO);
|
|
|
|
*val = ti_scm_read_4(ti_scm_sc, reg);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
ti_scm_reg_write_4(uint32_t reg, uint32_t val)
|
|
{
|
|
if (!ti_scm_sc)
|
|
return (ENXIO);
|
|
|
|
ti_scm_write_4(ti_scm_sc, reg, val);
|
|
return (0);
|
|
}
|
|
|
|
|
|
static device_method_t ti_scm_methods[] = {
|
|
DEVMETHOD(device_probe, ti_scm_probe),
|
|
DEVMETHOD(device_attach, ti_scm_attach),
|
|
{ 0, 0 }
|
|
};
|
|
|
|
static driver_t ti_scm_driver = {
|
|
"ti_scm",
|
|
ti_scm_methods,
|
|
sizeof(struct ti_scm_softc),
|
|
};
|
|
|
|
static devclass_t ti_scm_devclass;
|
|
|
|
DRIVER_MODULE(ti_scm, simplebus, ti_scm_driver, ti_scm_devclass, 0, 0);
|