Add PWM module driver for AM335x. Only eCAS subsystem is supported
Export function to configure eCAS submodule from another drivers. It's used to control LCD panel backlight on AM335x EVM.
This commit is contained in:
Oleksandr Tymoshenko
parent
2487319716
commit
7747ea65a0
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=251017
285
sys/arm/ti/am335x/am335x_pwm.c
Normal file
285
sys/arm/ti/am335x/am335x_pwm.c
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@ -0,0 +1,285 @@
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/*-
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* Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/resource.h>
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#include <sys/rman.h>
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#include <machine/bus.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <arm/ti/ti_prcm.h>
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#include <arm/ti/ti_scm.h>
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#include "am335x_pwm.h"
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#include "am335x_scm.h"
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#define PWM_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
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#define PWM_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
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#define PWM_LOCK_INIT(_sc) mtx_init(&(_sc)->sc_mtx, \
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device_get_nameunit(_sc->sc_dev), "am335x_pwm softc", MTX_DEF)
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#define PWM_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->sc_mtx);
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static struct resource_spec am335x_pwm_mem_spec[] = {
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{ SYS_RES_MEMORY, 0, RF_ACTIVE }, /* PWMSS */
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{ SYS_RES_MEMORY, 1, RF_ACTIVE }, /* eCAP */
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{ SYS_RES_MEMORY, 2, RF_ACTIVE }, /* eQEP */
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{ SYS_RES_MEMORY, 3, RF_ACTIVE }, /*ePWM */
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{ -1, 0, 0 }
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};
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#define PWMSS_READ4(_sc, reg) bus_read_4((_sc)->sc_mem_res[0], reg);
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#define PWMSS_WRITE4(_sc, reg, value) \
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bus_write_4((_sc)->sc_mem_res[0], reg, value);
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#define ECAP_READ2(_sc, reg) bus_read_2((_sc)->sc_mem_res[1], reg);
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#define ECAP_WRITE2(_sc, reg, value) \
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bus_write_2((_sc)->sc_mem_res[1], reg, value);
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#define ECAP_READ4(_sc, reg) bus_read_4((_sc)->sc_mem_res[1], reg);
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#define ECAP_WRITE4(_sc, reg, value) \
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bus_write_4((_sc)->sc_mem_res[1], reg, value);
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#define EPWM_READ2(_sc, reg) bus_read_2((_sc)->sc_mem_res[3], reg);
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#define EPWM_WRITE2(_sc, reg, value) \
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bus_write_2((_sc)->sc_mem_res[3], reg, value);
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#define PWMSS_IDVER 0x00
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#define PWMSS_SYSCONFIG 0x04
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#define PWMSS_CLKCONFIG 0x08
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#define CLKCONFIG_EPWMCLK_EN (1 << 8)
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#define PWMSS_CLKSTATUS 0x0C
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#define ECAP_TSCTR 0x00
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#define ECAP_CAP1 0x08
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#define ECAP_CAP2 0x0C
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#define ECAP_CAP3 0x10
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#define ECAP_CAP4 0x14
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#define ECAP_ECCTL2 0x2A
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#define ECCTL2_MODE_APWM (1 << 9)
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#define ECCTL2_SYNCO_SEL (3 << 6)
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#define ECCTL2_TSCTRSTOP_FREERUN (1 << 4)
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#define EPWM_TBCTL 0x00
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#define TBCTL_PHDIR_UP (1 << 13)
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#define TBCTL_PHDIR_DOWN (0 << 13)
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#define TBCTL_CLKDIV(x) ((x) << 10)
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#define TBCTL_HSPCLKDIV(x) ((x) << 7)
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#define TBCTL_SYNCOSEL_DISABLED (3 << 4)
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#define TBCTL_PRDLD_SHADOW (0 << 3)
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#define TBCTL_PRDLD_IMMEDIATE (0 << 3)
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#define TBCTL_PHSEN_ENABLED (1 << 2)
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#define TBCTL_PHSEN_DISABLED (0 << 2)
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#define EPWM_TBSTS 0x02
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#define EPWM_TBPHSHR 0x04
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#define EPWM_TBPHS 0x06
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#define EPWM_TBCNT 0x08
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#define EPWM_TBPRD 0x0a
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/* Counter-compare */
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#define EPWM_CMPCTL 0x0e
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#define CMPCTL_SHDWBMODE_SHADOW (1 << 6)
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#define CMPCTL_SHDWBMODE_IMMEDIATE (0 << 6)
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#define CMPCTL_SHDWAMODE_SHADOW (1 << 4)
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#define CMPCTL_SHDWAMODE_IMMEDIATE (0 << 4)
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#define CMPCTL_LOADBMODE_ZERO (0 << 2)
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#define CMPCTL_LOADBMODE_PRD (1 << 2)
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#define CMPCTL_LOADBMODE_EITHER (2 << 2)
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#define CMPCTL_LOADBMODE_FREEZE (3 << 2)
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#define CMPCTL_LOADAMODE_ZERO (0 << 0)
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#define CMPCTL_LOADAMODE_PRD (1 << 0)
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#define CMPCTL_LOADAMODE_EITHER (2 << 0)
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#define CMPCTL_LOADAMODE_FREEZE (3 << 0)
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#define EPWM_CMPAHR 0x10
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#define EPWM_CMPA 0x12
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#define EPWM_CMPB 0x14
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/* CMPCTL_LOADAMODE_ZERO */
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#define EPWM_AQCTLA 0x16
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#define EPWM_AQCTLB 0x18
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#define AQCTL_CAU_NONE (0 << 0)
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#define AQCTL_CAU_CLEAR (1 << 0)
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#define AQCTL_CAU_SET (2 << 0)
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#define AQCTL_CAU_TOGGLE (3 << 0)
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#define AQCTL_ZRO_NONE (0 << 0)
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#define AQCTL_ZRO_CLEAR (1 << 0)
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#define AQCTL_ZRO_SET (2 << 0)
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#define AQCTL_ZRO_TOGGLE (3 << 0)
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#define EPWM_AQSFRC 0x1a
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#define EPWM_AQCSFRC 0x1c
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static device_probe_t am335x_pwm_probe;
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static device_attach_t am335x_pwm_attach;
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static device_detach_t am335x_pwm_detach;
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struct am335x_pwm_softc {
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device_t sc_dev;
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struct mtx sc_mtx;
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struct resource *sc_mem_res[4];
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int sc_id;
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};
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static device_method_t am335x_pwm_methods[] = {
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DEVMETHOD(device_probe, am335x_pwm_probe),
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DEVMETHOD(device_attach, am335x_pwm_attach),
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DEVMETHOD(device_detach, am335x_pwm_detach),
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DEVMETHOD_END
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};
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static driver_t am335x_pwm_driver = {
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"am335x_pwm",
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am335x_pwm_methods,
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sizeof(struct am335x_pwm_softc),
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};
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static devclass_t am335x_pwm_devclass;
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/*
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* API function to set period/duty cycles for ECASx
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*/
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int
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am335x_pwm_config_ecas(int unit, int period, int duty)
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{
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device_t dev;
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struct am335x_pwm_softc *sc;
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uint16_t reg;
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dev = devclass_get_device(am335x_pwm_devclass, unit);
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if (dev == NULL)
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return (ENXIO);
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if (duty > period)
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return (EINVAL);
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if (period == 0)
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return (EINVAL);
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sc = device_get_softc(dev);
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PWM_LOCK(sc);
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reg = ECAP_READ2(sc, ECAP_ECCTL2);
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reg |= ECCTL2_MODE_APWM | ECCTL2_TSCTRSTOP_FREERUN | ECCTL2_SYNCO_SEL;
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ECAP_WRITE2(sc, ECAP_ECCTL2, reg);
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/* CAP3 in APWM mode is APRD shadow register */
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ECAP_WRITE4(sc, ECAP_CAP3, period - 1);
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/* CAP4 in APWM mode is ACMP shadow register */
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ECAP_WRITE4(sc, ECAP_CAP4, duty);
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/* Restart counter */
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ECAP_WRITE4(sc, ECAP_TSCTR, 0);
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PWM_UNLOCK(sc);
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return (0);
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}
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static int
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am335x_pwm_probe(device_t dev)
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{
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if (!ofw_bus_is_compatible(dev, "ti,am335x-pwm"))
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return (ENXIO);
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device_set_desc(dev, "AM335x PWM");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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am335x_pwm_attach(device_t dev)
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{
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struct am335x_pwm_softc *sc;
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int err;
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uint32_t reg;
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phandle_t node;
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pcell_t did;
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sc = device_get_softc(dev);
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sc->sc_dev = dev;
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/* Get the PWM module id */
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node = ofw_bus_get_node(dev);
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if ((OF_getprop(node, "pwm-device-id", &did, sizeof(did))) <= 0) {
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device_printf(dev, "missing pwm-device-id attribute in FDT\n");
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return (ENXIO);
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}
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sc->sc_id = fdt32_to_cpu(did);
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PWM_LOCK_INIT(sc);
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err = bus_alloc_resources(dev, am335x_pwm_mem_spec,
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sc->sc_mem_res);
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if (err) {
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device_printf(dev, "cannot allocate memory resources\n");
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goto fail;
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}
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ti_prcm_clk_enable(PWMSS0_CLK + sc->sc_id);
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ti_scm_reg_read_4(SCM_PWMSS_CTRL, ®);
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reg |= (1 << sc->sc_id);
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ti_scm_reg_write_4(SCM_PWMSS_CTRL, reg);
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return (0);
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fail:
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PWM_LOCK_DESTROY(sc);
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if (sc->sc_mem_res[0])
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bus_release_resources(dev, am335x_pwm_mem_spec,
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sc->sc_mem_res);
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return(ENXIO);
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}
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static int
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am335x_pwm_detach(device_t dev)
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{
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struct am335x_pwm_softc *sc;
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sc = device_get_softc(dev);
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PWM_LOCK(sc);
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if (sc->sc_mem_res[0])
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bus_release_resources(dev, am335x_pwm_mem_spec,
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sc->sc_mem_res);
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PWM_UNLOCK(sc);
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PWM_LOCK_DESTROY(sc);
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return (0);
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}
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DRIVER_MODULE(am335x_pwm, simplebus, am335x_pwm_driver, am335x_pwm_devclass, 0, 0);
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MODULE_VERSION(am335x_pwm, 1);
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MODULE_DEPEND(am335x_pwm, simplebus, 1, 1, 1);
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33
sys/arm/ti/am335x/am335x_pwm.h
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33
sys/arm/ti/am335x/am335x_pwm.h
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@ -0,0 +1,33 @@
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/*-
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* Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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||||
* notice, this list of conditions and the following disclaimer.
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||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef __AM335X_PWM_H__
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#define __AM335X_PWM_H__
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int am335x_pwm_config_ecas(int unit, int period, int duty);
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#endif /* __AM335X_PWM_H__ */
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@ -4,6 +4,7 @@ arm/ti/aintc.c standard
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arm/ti/am335x/am335x_prcm.c standard
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arm/ti/am335x/am335x_dmtimer.c standard
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arm/ti/am335x/am335x_scm_padconf.c standard
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arm/ti/am335x/am335x_pwm.c standard
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arm/ti/ti_edma3.c standard
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arm/ti/ti_mmchs.c optional mmc
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arm/ti/cpsw/if_cpsw.c optional cpsw
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