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[src/trunk]: src/sys/arch/arm/samsung Add driver for Exynos PWM timer.



details:   https://anonhg.NetBSD.org/src/rev/5890b54fa9e8
branches:  trunk
changeset: 991268:5890b54fa9e8
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 1a1cc61ac826 -r 5890b54fa9e8 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 1a1cc61ac826 -r 5890b54fa9e8 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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