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[src/trunk]: src/sys/arch/arm/samsung Add driver for Exynos PWM timer.
details: https://anonhg.NetBSD.org/src/rev/cbee7356c573
branches: trunk
changeset: 320411:cbee7356c573
user: jmcneill <jmcneill%NetBSD.org@localhost>
date: Wed Jul 04 23:06:54 2018 +0000
description:
Add driver for Exynos PWM timer.
diffstat:
sys/arch/arm/samsung/exynos_pwm.c | 263 ++++++++++++++++++++++++++++++++++++++
sys/arch/arm/samsung/files.exynos | 7 +-
2 files changed, 269 insertions(+), 1 deletions(-)
diffs (288 lines):
diff -r ff60362a9eb3 -r cbee7356c573 sys/arch/arm/samsung/exynos_pwm.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/arm/samsung/exynos_pwm.c Wed Jul 04 23:06:54 2018 +0000
@@ -0,0 +1,263 @@
+/* $NetBSD: exynos_pwm.c,v 1.1 2018/07/04 23:06:54 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2018 Jared McNeill <jmcneill%invisible.ca@localhost>
+ * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+#include <sys/cdefs.h>
+
+__KERNEL_RCSID(1, "$NetBSD: exynos_pwm.c,v 1.1 2018/07/04 23:06:54 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/device.h>
+#include <sys/intr.h>
+#include <sys/systm.h>
+#include <sys/time.h>
+
+#include <dev/pwm/pwmvar.h>
+
+#include <dev/fdt/fdtvar.h>
+
+#define TCFG0 0x00
+#define TCFG1 0x04
+#define TCON 0x08
+#define _TCON_OFF(n) ((n) == 0 ? 0 : (((n) + 1) * 4))
+#define TCON_START(n) __BIT(_TCON_OFF(n) + 0)
+#define TCON_UPDATE(n) __BIT(_TCON_OFF(n) + 1)
+#define TCON_OUTINV(n) __BIT(_TCON_OFF(n) + 2)
+#define TCON_AUTO_RELOAD(n) __BIT(_TCON_OFF(n) + 3)
+#define TCON_DEADZONE_EN(n) __BIT(_TCON_OFF(n) + 4)
+#define TCNTB(n) (0x0c + (n) * 12)
+#define TCMPB(n) (0x10 + (n) * 12)
+#define TCNTO(n) (0x14 + (n) * 12)
+#define TINT_CSTAT 0x44
+
+#define PWM_NTIMERS 5
+
+static const char * const compatible[] = {
+ "samsung,exynos4210-pwm",
+ NULL
+};
+
+struct exynos_pwm_softc;
+
+struct exynos_pwm_timer {
+ u_int timer_index;
+ struct pwm_controller timer_pwm;
+};
+
+struct exynos_pwm_softc {
+ device_t sc_dev;
+ bus_space_tag_t sc_bst;
+ bus_space_handle_t sc_bsh;
+
+ struct exynos_pwm_timer sc_timer[PWM_NTIMERS];
+ u_int sc_timermask;
+
+ u_int sc_clkfreq;
+};
+
+#define PWM_READ(sc, reg) \
+ bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg))
+#define PWM_WRITE(sc, reg, val) \
+ bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val))
+
+static int
+exynos_pwm_enable(pwm_tag_t pwm, bool enable)
+{
+ struct exynos_pwm_timer * const timer = pwm->pwm_priv;
+ struct exynos_pwm_softc * const sc = device_private(pwm->pwm_dev);
+ uint32_t tcon;
+
+ if (enable) {
+ tcon = PWM_READ(sc, TCON);
+ tcon &= ~TCON_START(timer->timer_index);
+ tcon |= TCON_UPDATE(timer->timer_index);
+ PWM_WRITE(sc, TCON, tcon);
+ tcon &= ~TCON_UPDATE(timer->timer_index);
+ tcon |= TCON_START(timer->timer_index);
+ tcon |= TCON_AUTO_RELOAD(timer->timer_index);
+ PWM_WRITE(sc, TCON, tcon);
+ } else {
+ tcon = PWM_READ(sc, TCON);
+ tcon &= ~TCON_AUTO_RELOAD(timer->timer_index);
+ PWM_WRITE(sc, TCON, tcon);
+ }
+
+ return 0;
+}
+
+static int
+exynos_pwm_get_config(pwm_tag_t pwm, struct pwm_config *conf)
+{
+ struct exynos_pwm_timer * const timer = pwm->pwm_priv;
+ struct exynos_pwm_softc * const sc = device_private(pwm->pwm_dev);
+ uint32_t tcon, tcntb, tcmpb;
+
+ tcon = PWM_READ(sc, TCON);
+ tcntb = PWM_READ(sc, TCNTB(timer->timer_index));
+ tcmpb = PWM_READ(sc, TCMPB(timer->timer_index));
+
+ conf->polarity = (tcon & TCON_OUTINV(timer->timer_index)) ? PWM_ACTIVE_HIGH : PWM_ACTIVE_LOW;
+ conf->period = (u_int)(((uint64_t)tcntb * 1000000000) / sc->sc_clkfreq);
+ conf->duty_cycle = (u_int)(((uint64_t)tcmpb * 1000000000) / sc->sc_clkfreq);
+
+ return 0;
+}
+
+static int
+exynos_pwm_set_config(pwm_tag_t pwm, const struct pwm_config *conf)
+{
+ struct exynos_pwm_timer * const timer = pwm->pwm_priv;
+ struct exynos_pwm_softc * const sc = device_private(pwm->pwm_dev);
+ uint32_t tcon, tcntb, tcmpb;
+
+ tcon = PWM_READ(sc, TCON);
+ if (conf->polarity == PWM_ACTIVE_HIGH)
+ tcon |= TCON_OUTINV(timer->timer_index);
+ else
+ tcon &= ~TCON_OUTINV(timer->timer_index);
+ PWM_WRITE(sc, TCON, tcon);
+
+ tcntb = conf->period / (1000000000 / sc->sc_clkfreq);
+ tcmpb = conf->duty_cycle / (1000000000 / sc->sc_clkfreq);
+ if (tcmpb == 0)
+ tcmpb = 1;
+ tcmpb = tcntb - tcmpb;
+
+ PWM_WRITE(sc, TCNTB(timer->timer_index), tcntb - 1);
+ PWM_WRITE(sc, TCMPB(timer->timer_index), tcmpb - 1);
+
+ tcon = PWM_READ(sc, TCON);
+ tcon |= TCON_UPDATE(timer->timer_index);
+ tcon |= TCON_AUTO_RELOAD(timer->timer_index);
+ PWM_WRITE(sc, TCON, tcon);
+
+ tcon &= ~TCON_UPDATE(timer->timer_index);
+ PWM_WRITE(sc, TCON, tcon);
+
+ return 0;
+}
+
+static pwm_tag_t
+exynos_pwm_get_tag(device_t dev, const void *data, size_t len)
+{
+ struct exynos_pwm_softc * const sc = device_private(dev);
+ struct exynos_pwm_timer *timer;
+ const u_int *pwm = data;
+ struct pwm_config conf;
+
+ if (len != 16)
+ return NULL;
+
+ const u_int index = be32toh(pwm[1]);
+ if (index >= 32 || (sc->sc_timermask & __BIT(index)) == 0)
+ return NULL;
+
+ const u_int period = be32toh(pwm[2]);
+ const u_int polarity = be32toh(pwm[3]);
+
+ timer = &sc->sc_timer[index];
+
+ /* Set initial timer polarity and period from specifier */
+ exynos_pwm_get_config(&timer->timer_pwm, &conf);
+ conf.period = period;
+ conf.polarity = polarity ? PWM_ACTIVE_LOW : PWM_ACTIVE_HIGH;
+ exynos_pwm_set_config(&timer->timer_pwm, &conf);
+
+ return &timer->timer_pwm;
+}
+
+static struct fdtbus_pwm_controller_func exynos_pwm_funcs = {
+ .get_tag = exynos_pwm_get_tag
+};
+
+static int
+exynos_pwm_match(device_t parent, cfdata_t cf, void *aux)
+{
+ struct fdt_attach_args * const faa = aux;
+
+ return of_match_compatible(faa->faa_phandle, compatible);
+}
+
+static void
+exynos_pwm_attach(device_t parent, device_t self, void *aux)
+{
+ struct exynos_pwm_softc * const sc = device_private(self);
+ struct fdt_attach_args * const faa = aux;
+ const int phandle = faa->faa_phandle;
+ const u_int *data;
+ struct clk *clk;
+ bus_addr_t addr;
+ bus_size_t size;
+ int error, len, n;
+
+ if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
+ aprint_error(": couldn't get registers\n");
+ return;
+ }
+
+ clk = fdtbus_clock_get(phandle, "timers");
+ if (clk == NULL || clk_enable(clk) != 0) {
+ aprint_error(": couldn't enable timers clock\n");
+ return;
+ }
+
+ sc->sc_dev = self;
+ sc->sc_clkfreq = clk_get_rate(clk);
+ sc->sc_bst = faa->faa_bst;
+ error = bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh);
+ if (error) {
+ aprint_error(": couldn't map %#llx: %d", (uint64_t)addr, error);
+ return;
+ }
+ for (n = 0; n < PWM_NTIMERS; n++) {
+ sc->sc_timer[n].timer_index = n;
+ sc->sc_timer[n].timer_pwm.pwm_enable = exynos_pwm_enable;
+ sc->sc_timer[n].timer_pwm.pwm_get_config = exynos_pwm_get_config;
+ sc->sc_timer[n].timer_pwm.pwm_set_config = exynos_pwm_set_config;
+ sc->sc_timer[n].timer_pwm.pwm_dev = self;
+ sc->sc_timer[n].timer_pwm.pwm_priv = &sc->sc_timer[n];
+ sc->sc_timermask |= __BIT(n);
+ }
+
+ data = fdtbus_get_prop(phandle, "samsung,pwm-outputs", &len);
+ if (data) {
+ sc->sc_timermask = 0;
+ for (n = 0; n < len / 4; n++) {
+ sc->sc_timermask |= __BIT(be32toh(data[n]));
+ }
+ }
+
+ aprint_naive("\n");
+ aprint_normal(": PWM\n");
+
+ fdtbus_register_pwm_controller(self, phandle,
+ &exynos_pwm_funcs);
+}
+
+CFATTACH_DECL_NEW(exynos_pwm, sizeof(struct exynos_pwm_softc),
+ exynos_pwm_match, exynos_pwm_attach, NULL, NULL);
diff -r ff60362a9eb3 -r cbee7356c573 sys/arch/arm/samsung/files.exynos
--- a/sys/arch/arm/samsung/files.exynos Wed Jul 04 23:06:28 2018 +0000
+++ b/sys/arch/arm/samsung/files.exynos Wed Jul 04 23:06:54 2018 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files.exynos,v 1.28 2018/07/03 16:09:04 jmcneill Exp $
+# $NetBSD: files.exynos,v 1.29 2018/07/04 23:06:54 jmcneill Exp $
#
# Configuration info for Samsung Exynos SoC ARM Peripherals
#
@@ -106,6 +106,11 @@
attach exyoi2c at fdt with exynos_i2c
file arch/arm/samsung/exynos_i2c.c exynos_i2c needs-flag
+# PWM timer
+device expwm: pwm
+attach expwm at fdt with exynos_pwm
+file arch/arm/samsung/exynos_pwm.c exynos_pwm
+
device exy5422clk: clk
attach exy5422clk at fdt with exynos5422_clock
file arch/arm/samsung/exynos5422_clock.c exynos5422_clock
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