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[src/trunk]: src/sys/arch/arm/sunxi Add driver for Allwinner PWM controller.
details: https://anonhg.NetBSD.org/src/rev/9507a791a521
branches: trunk
changeset: 832307:9507a791a521
user: jmcneill <jmcneill%NetBSD.org@localhost>
date: Sun May 06 10:34:34 2018 +0000
description:
Add driver for Allwinner PWM controller.
diffstat:
sys/arch/arm/sunxi/files.sunxi | 7 +-
sys/arch/arm/sunxi/sunxi_pwm.c | 233 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 239 insertions(+), 1 deletions(-)
diffs (258 lines):
diff -r e114ba85f03e -r 9507a791a521 sys/arch/arm/sunxi/files.sunxi
--- a/sys/arch/arm/sunxi/files.sunxi Sun May 06 10:34:23 2018 +0000
+++ b/sys/arch/arm/sunxi/files.sunxi Sun May 06 10:34:34 2018 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files.sunxi,v 1.53 2018/05/05 09:54:53 jmcneill Exp $
+# $NetBSD: files.sunxi,v 1.54 2018/05/06 10:34:34 jmcneill Exp $
#
# Configuration info for Allwinner sunxi family SoCs
#
@@ -121,6 +121,11 @@
attach com at fdt with sunxi_com
file arch/arm/sunxi/sunxi_com.c sunxi_com needs-flag
+# PWM
+device sunxipwm: pwm
+attach sunxipwm at fdt with sunxi_pwm
+file arch/arm/sunxi/sunxi_pwm.c sunxi_pwm
+
# SD/MMC
device sunximmc: sdmmcbus
attach sunximmc at fdt with sunxi_mmc
diff -r e114ba85f03e -r 9507a791a521 sys/arch/arm/sunxi/sunxi_pwm.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/arm/sunxi/sunxi_pwm.c Sun May 06 10:34:34 2018 +0000
@@ -0,0 +1,233 @@
+/* $NetBSD: sunxi_pwm.c,v 1.1 2018/05/06 10:34:34 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: sunxi_pwm.c,v 1.1 2018/05/06 10:34:34 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 PWM_CH_CTRL 0x00
+#define PWM0_RDY __BIT(28)
+#define PWM0_BYPASS __BIT(9)
+#define PWM_CH0_PUL_START __BIT(8)
+#define PWM_CHANNEL0_MODE __BIT(7)
+#define SCLK_CH0_GATING __BIT(6)
+#define PWM_CH0_ACT_STA __BIT(5)
+#define PWM_CH0_EN __BIT(4)
+#define PWM_CH0_PRESCAL __BITS(3,0)
+#define PWM_CH0_PERIOD 0x04
+#define PWM_CH0_ENTIRE_CYS __BITS(31,16)
+#define PWM_CH0_ENTIRE_ACT_CYS __BITS(15,0)
+
+enum sunxi_pwm_type {
+ PWM_A64 = 1,
+};
+
+static const struct of_compat_data compat_data[] = {
+ { "allwinner,sun50i-a64-pwm", PWM_A64 },
+ { NULL }
+};
+
+struct sunxi_pwm_softc {
+ device_t sc_dev;
+ bus_space_tag_t sc_bst;
+ bus_space_handle_t sc_bsh;
+
+ struct pwm_controller sc_pwm;
+ struct pwm_config sc_conf;
+
+ 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 pwm_tag_t
+sunxi_pwm_get_tag(device_t dev, const void *data, size_t len)
+{
+ struct sunxi_pwm_softc * const sc = device_private(dev);
+ const u_int *pwm = data;
+
+ if (len != 16)
+ return NULL;
+
+ const u_int index = be32toh(pwm[1]);
+ if (index != 0)
+ return NULL;
+
+ const u_int period = be32toh(pwm[2]);
+ const u_int polarity = be32toh(pwm[3]);
+
+ sc->sc_conf.period = period;
+ sc->sc_conf.polarity = polarity ? PWM_ACTIVE_LOW : PWM_ACTIVE_HIGH;
+
+ return &sc->sc_pwm;
+}
+
+static struct fdtbus_pwm_controller_func sunxi_pwm_funcs = {
+ .get_tag = sunxi_pwm_get_tag
+};
+
+static int
+sunxi_pwm_enable(pwm_tag_t pwm, bool enable)
+{
+ struct sunxi_pwm_softc * const sc = device_private(pwm->pwm_dev);
+ uint32_t ctrl, octrl;
+
+ octrl = ctrl = PWM_READ(sc, PWM_CH_CTRL);
+ if (enable)
+ ctrl |= (PWM_CH0_EN | SCLK_CH0_GATING);
+ else
+ ctrl &= ~(PWM_CH0_EN | SCLK_CH0_GATING);
+
+ if (ctrl != octrl)
+ PWM_WRITE(sc, PWM_CH_CTRL, ctrl);
+
+ return 0;
+}
+
+static int
+sunxi_pwm_get_config(pwm_tag_t pwm, struct pwm_config *conf)
+{
+ struct sunxi_pwm_softc * const sc = device_private(pwm->pwm_dev);
+ uint32_t ctrl, ch_period;
+
+ ctrl = PWM_READ(sc, PWM_CH_CTRL);
+ ch_period = PWM_READ(sc, PWM_CH0_PERIOD);
+
+ const uint64_t rate = sc->sc_clkfreq / 120;
+ const u_int cycles = __SHIFTOUT(ch_period, PWM_CH0_ENTIRE_CYS) + 1;
+ const u_int act_cycles = __SHIFTOUT(ch_period, PWM_CH0_ENTIRE_ACT_CYS);
+
+ conf->polarity = (ctrl & PWM_CH0_ACT_STA) ? PWM_ACTIVE_HIGH : PWM_ACTIVE_LOW;
+ conf->period = (u_int)(((uint64_t)cycles * 1000000000) / rate);
+ conf->duty_cycle = (u_int)(((uint64_t)act_cycles * 1000000000) / rate);
+
+ return 0;
+}
+
+static int
+sunxi_pwm_set_config(pwm_tag_t pwm, const struct pwm_config *conf)
+{
+ struct sunxi_pwm_softc * const sc = device_private(pwm->pwm_dev);
+ uint32_t ctrl, ch_period;
+
+ ctrl = PWM_READ(sc, PWM_CH_CTRL);
+ if (ctrl & PWM0_RDY)
+ return EBUSY;
+
+ ctrl &= ~PWM0_BYPASS; /* Prescaler /120 = 200 kHz */
+ ctrl &= ~PWM_CH0_PRESCAL;
+ ctrl |= __SHIFTIN(0, PWM_CH0_PRESCAL);
+
+ ctrl &= ~PWM_CHANNEL0_MODE; /* Cycle mode */
+ if (conf->polarity == PWM_ACTIVE_HIGH)
+ ctrl |= PWM_CH0_ACT_STA;
+ else
+ ctrl &= ~PWM_CH0_ACT_STA;
+
+ const uint64_t rate = sc->sc_clkfreq / 120;
+ const u_int cycles = (u_int)((conf->period * rate) / 1000000000);
+ const u_int act_cycles = (u_int)((conf->duty_cycle * rate) / 1000000000);
+
+ ch_period = __SHIFTIN(cycles - 1, PWM_CH0_ENTIRE_CYS);
+ ch_period |= __SHIFTIN(act_cycles, PWM_CH0_ENTIRE_ACT_CYS);
+
+ PWM_WRITE(sc, PWM_CH0_PERIOD, ch_period);
+ PWM_WRITE(sc, PWM_CH_CTRL, ctrl);
+
+ sc->sc_conf = *conf;
+
+ return 0;
+}
+
+static int
+sunxi_pwm_match(device_t parent, cfdata_t cf, void *aux)
+{
+ struct fdt_attach_args * const faa = aux;
+
+ return of_match_compat_data(faa->faa_phandle, compat_data);
+}
+
+static void
+sunxi_pwm_attach(device_t parent, device_t self, void *aux)
+{
+ struct sunxi_pwm_softc * const sc = device_private(self);
+ struct fdt_attach_args * const faa = aux;
+ const int phandle = faa->faa_phandle;
+ struct clk *clk;
+ bus_addr_t addr;
+ bus_size_t size;
+ int error;
+
+ if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
+ aprint_error(": couldn't get registers\n");
+ return;
+ }
+
+ clk = fdtbus_clock_get_index(phandle, 0);
+ if (clk == NULL) {
+ aprint_error(": couldn't get 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;
+ }
+
+ aprint_naive("\n");
+ aprint_normal(": PWM\n");
+
+ sc->sc_pwm.pwm_enable = sunxi_pwm_enable;
+ sc->sc_pwm.pwm_get_config = sunxi_pwm_get_config;
+ sc->sc_pwm.pwm_set_config = sunxi_pwm_set_config;
+ sc->sc_pwm.pwm_dev = self;
+
+ fdtbus_register_pwm_controller(self, phandle,
+ &sunxi_pwm_funcs);
+}
+
+CFATTACH_DECL_NEW(sunxi_pwm, sizeof(struct sunxi_pwm_softc),
+ sunxi_pwm_match, sunxi_pwm_attach, NULL, NULL);
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