Author: manu Date: Thu Jan 16 21:25:13 2020 New Revision: 356808 URL: https://svnweb.freebsd.org/changeset/base/356808
Log: arm64: rockchip: Add RK3399 PWM driver Add a driver for the pwm controller in the RK3399 SoC Submitted by: bdragon (original version) Reviewed by: ganbold (previous version) MFC after: 1 month Differential Revision: https://reviews.freebsd.org/D19046 Added: head/sys/arm64/rockchip/rk_pwm.c (contents, props changed) Modified: head/sys/arm64/conf/GENERIC head/sys/arm64/rockchip/clk/rk3399_pmucru.c head/sys/conf/files.arm64 Modified: head/sys/arm64/conf/GENERIC ============================================================================== --- head/sys/arm64/conf/GENERIC Thu Jan 16 21:21:20 2020 (r356807) +++ head/sys/arm64/conf/GENERIC Thu Jan 16 21:25:13 2020 (r356808) @@ -297,6 +297,7 @@ device rk_spi # RockChip SPI controller # PWM device pwm device aw_pwm +device rk_pwm # Console device vt Modified: head/sys/arm64/rockchip/clk/rk3399_pmucru.c ============================================================================== --- head/sys/arm64/rockchip/clk/rk3399_pmucru.c Thu Jan 16 21:21:20 2020 (r356807) +++ head/sys/arm64/rockchip/clk/rk3399_pmucru.c Thu Jan 16 21:25:13 2020 (r356808) @@ -58,6 +58,7 @@ __FBSDID("$FreeBSD$"); #define PCLK_I2C0_PMU 27 #define PCLK_I2C4_PMU 28 #define PCLK_I2C8_PMU 29 +#define PCLK_RKPWM_PMU 30 static struct rk_cru_gate rk3399_pmu_gates[] = { /* PMUCRU_CLKGATE_CON1 */ @@ -67,8 +68,8 @@ static struct rk_cru_gate rk3399_pmu_gates[] = { CRU_GATE(PCLK_I2C0_PMU, "pclk_i2c0_pmu", "pclk_pmu_src", 0x104, 7) CRU_GATE(PCLK_I2C4_PMU, "pclk_i2c4_pmu", "pclk_pmu_src", 0x104, 8) CRU_GATE(PCLK_I2C8_PMU, "pclk_i2c8_pmu", "pclk_pmu_src", 0x104, 9) + CRU_GATE(PCLK_RKPWM_PMU, "pclk_rkpwm_pmu", "pclk_pmu_src", 0x104, 10) }; - /* * PLLs Added: head/sys/arm64/rockchip/rk_pwm.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/arm64/rockchip/rk_pwm.c Thu Jan 16 21:25:13 2020 (r356808) @@ -0,0 +1,403 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause-FreeBSD + * + * Copyright (c) 2018 Emmanuel Vadot <m...@freebsd.org> + * Copyright (c) 2019 Brandon Bergren <g...@bdragon.rtk0.net> + * + * 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 AUTHOR ``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 AUTHOR 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. + * + * $FreeBSD$ + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/bus.h> +#include <sys/kernel.h> +#include <sys/module.h> +#include <sys/rman.h> +#include <sys/resource.h> +#include <machine/bus.h> + +#include <dev/ofw/ofw_bus.h> +#include <dev/ofw/ofw_bus_subr.h> + +#include <dev/extres/clk/clk.h> + +#include "pwmbus_if.h" + +/* Register offsets. */ +#define RK_PWM_COUNTER 0x00 +#define RK_PWM_PERIOD 0x04 +#define RK_PWM_DUTY 0x08 +#define RK_PWM_CTRL 0x0c + +#define SET(reg,mask,val) reg = ((reg & ~mask) | val) + +#define RK_PWM_CTRL_ENABLE_MASK (1 << 0) +#define RK_PWM_CTRL_ENABLED (1 << 0) +#define RK_PWM_CTRL_DISABLED (0) + +#define RK_PWM_CTRL_MODE_MASK (3 << 1) +#define RK_PWM_CTRL_MODE_ONESHOT (0) +#define RK_PWM_CTRL_MODE_CONTINUOUS (1 << 1) +#define RK_PWM_CTRL_MODE_CAPTURE (1 << 2) + +#define RK_PWM_CTRL_DUTY_MASK (1 << 3) +#define RK_PWM_CTRL_DUTY_POSITIVE (1 << 3) +#define RK_PWM_CTRL_DUTY_NEGATIVE (0) + +#define RK_PWM_CTRL_INACTIVE_MASK (1 << 4) +#define RK_PWM_CTRL_INACTIVE_POSITIVE (1 << 4) +#define RK_PWM_CTRL_INACTIVE_NEGATIVE (0) + +/* PWM Output Alignment */ +#define RK_PWM_CTRL_ALIGN_MASK (1 << 5) +#define RK_PWM_CTRL_ALIGN_CENTER (1 << 5) +#define RK_PWM_CTRL_ALIGN_LEFT (0) + +/* Low power mode: disable prescaler when inactive */ +#define RK_PWM_CTRL_LP_MASK (1 << 8) +#define RK_PWM_CTRL_LP_ENABLE (1 << 8) +#define RK_PWM_CTRL_LP_DISABLE (0) + +/* Clock source: bypass the scaler or not */ +#define RK_PWM_CTRL_CLOCKSRC_MASK (1 << 9) +#define RK_PWM_CTRL_CLOCKSRC_NONSCALED (0) +#define RK_PWM_CTRL_CLOCKSRC_SCALED (1 << 9) + +#define RK_PWM_CTRL_PRESCALE_MASK (7 << 12) +#define RK_PWM_CTRL_PRESCALE_SHIFT 12 + +#define RK_PWM_CTRL_SCALE_MASK (0xFF << 16) +#define RK_PWM_CTRL_SCALE_SHIFT 16 + +#define RK_PWM_CTRL_REPEAT_MASK (0xFF << 24) +#define RK_PWM_CTRL_REPEAT_SHIFT 24 + +#define NS_PER_SEC 1000000000 + +static struct ofw_compat_data compat_data[] = { + { "rockchip,rk3399-pwm", 1 }, + { NULL, 0 } +}; + +static struct resource_spec rk_pwm_spec[] = { + { SYS_RES_MEMORY, 0, RF_ACTIVE }, + { -1, 0 } +}; + +struct rk_pwm_softc { + device_t dev; + device_t busdev; + clk_t clk; + struct resource *res; + + uint64_t clk_freq; + unsigned int period; + unsigned int duty; + uint32_t flags; + uint8_t prescaler; + uint8_t scaler; + bool using_scaler; + bool enabled; +}; + +#define RK_PWM_READ(sc, reg) bus_read_4((sc)->res, (reg)) +#define RK_PWM_WRITE(sc, reg, val) bus_write_4((sc)->res, (reg), (val)) + +static int rk_pwm_probe(device_t dev); +static int rk_pwm_attach(device_t dev); +static int rk_pwm_detach(device_t dev); + +static int +rk_pwm_probe(device_t dev) +{ + if (!ofw_bus_status_okay(dev)) + return (ENXIO); + + if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data) + return (ENXIO); + + device_set_desc(dev, "Rockchip PWM"); + return (BUS_PROBE_DEFAULT); +} + +static int +rk_pwm_attach(device_t dev) +{ + struct rk_pwm_softc *sc; + phandle_t node; + uint64_t clk_freq; + uint32_t reg; + int error; + + sc = device_get_softc(dev); + sc->dev = dev; + + error = clk_get_by_ofw_index(dev, 0, 0, &sc->clk); + if (error != 0) { + device_printf(dev, "cannot get clock\n"); + goto fail; + } + error = clk_enable(sc->clk); + if (error != 0) { + device_printf(dev, "cannot enable clock\n"); + goto fail; + } + error = clk_get_freq(sc->clk, &sc->clk_freq); + if (error != 0) { + device_printf(dev, "cannot get base frequency\n"); + goto fail; + } + + if (bus_alloc_resources(dev, rk_pwm_spec, &sc->res) != 0) { + device_printf(dev, "cannot allocate resources for device\n"); + error = ENXIO; + goto fail; + } + + /* Read the configuration left by U-Boot */ + reg = RK_PWM_READ(sc, RK_PWM_CTRL); + if ((reg & RK_PWM_CTRL_ENABLE_MASK) == RK_PWM_CTRL_ENABLED) + sc->enabled = true; + + reg = RK_PWM_READ(sc, RK_PWM_CTRL); + reg &= RK_PWM_CTRL_PRESCALE_MASK; + sc->prescaler = reg >> RK_PWM_CTRL_PRESCALE_SHIFT; + + reg = RK_PWM_READ(sc, RK_PWM_CTRL); + reg &= RK_PWM_CTRL_SCALE_MASK; + sc->scaler = reg >> RK_PWM_CTRL_SCALE_SHIFT; + + reg = RK_PWM_READ(sc, RK_PWM_CTRL); + if ((reg & RK_PWM_CTRL_CLOCKSRC_MASK) == RK_PWM_CTRL_CLOCKSRC_SCALED) + sc->using_scaler = true; + else + sc->using_scaler = false; + + clk_freq = sc->clk_freq / (2 ^ sc->prescaler); + + if (sc->using_scaler) { + if (sc->scaler == 0) + clk_freq /= 512; + else + clk_freq /= (sc->scaler * 2); + } + + reg = RK_PWM_READ(sc, RK_PWM_PERIOD); + sc->period = NS_PER_SEC / + (clk_freq / reg); + reg = RK_PWM_READ(sc, RK_PWM_DUTY); + sc->duty = NS_PER_SEC / + (clk_freq / reg); + + node = ofw_bus_get_node(dev); + OF_device_register_xref(OF_xref_from_node(node), dev); + + sc->busdev = device_add_child(dev, "pwmbus", -1); + + return (bus_generic_attach(dev)); + +fail: + rk_pwm_detach(dev); + return (error); +} + +static int +rk_pwm_detach(device_t dev) +{ + struct rk_pwm_softc *sc; + + sc = device_get_softc(dev); + + bus_generic_detach(sc->dev); + + bus_release_resources(dev, rk_pwm_spec, &sc->res); + + return (0); +} + +static phandle_t +aw_pwm_get_node(device_t bus, device_t dev) +{ + + /* + * Share our controller node with our pwmbus child; it instantiates + * devices by walking the children contained within our node. + */ + return ofw_bus_get_node(bus); +} + +static int +rk_pwm_channel_count(device_t dev, u_int *nchannel) +{ + /* The device supports 4 channels, but attaches multiple times in the + * device tree. This interferes with advanced usage though, as + * the interrupt capability and channel 3 FIFO register offsets + * don't work right in this situation. + * But since we don't support those yet, pretend we are singlechannel. + */ + *nchannel = 1; + + return (0); +} + +static int +rk_pwm_channel_config(device_t dev, u_int channel, u_int period, u_int duty) +{ + struct rk_pwm_softc *sc; + uint64_t period_freq, duty_freq; + uint32_t reg; + uint32_t period_out; + uint32_t duty_out; + uint8_t prescaler; + uint8_t scaler; + bool using_scaler; + + sc = device_get_softc(dev); + + period_freq = NS_PER_SEC / period; + /* Datasheet doesn't define, so use Nyquist frequency. */ + if (period_freq > (sc->clk_freq / 2)) + return (EINVAL); + duty_freq = NS_PER_SEC / duty; + if (duty_freq < period_freq) { + device_printf(sc->dev, "duty < period\n"); + return (EINVAL); + } + + /* Assuming 24 MHz reference, we should never actually have + to use the divider due to pwm API limitations. */ + prescaler = 0; + scaler = 0; + using_scaler = false; + + /* XXX Expand API to allow for 64 bit period/duty. */ + period_out = (sc->clk_freq * period) / NS_PER_SEC; + duty_out = (sc->clk_freq * duty) / NS_PER_SEC; + + reg = RK_PWM_READ(sc, RK_PWM_CTRL); + + if ((reg & RK_PWM_CTRL_MODE_MASK) != RK_PWM_CTRL_MODE_CONTINUOUS) { + /* Switching modes, disable just in case. */ + SET(reg, RK_PWM_CTRL_ENABLE_MASK, RK_PWM_CTRL_DISABLED); + RK_PWM_WRITE(sc, RK_PWM_CTRL, reg); + } + + RK_PWM_WRITE(sc, RK_PWM_PERIOD, period_out); + RK_PWM_WRITE(sc, RK_PWM_DUTY, duty_out); + + SET(reg, RK_PWM_CTRL_ENABLE_MASK, RK_PWM_CTRL_ENABLED); + SET(reg, RK_PWM_CTRL_MODE_MASK, RK_PWM_CTRL_MODE_CONTINUOUS); + SET(reg, RK_PWM_CTRL_ALIGN_MASK, RK_PWM_CTRL_ALIGN_LEFT); + SET(reg, RK_PWM_CTRL_CLOCKSRC_MASK, using_scaler); + SET(reg, RK_PWM_CTRL_PRESCALE_MASK, + prescaler << RK_PWM_CTRL_PRESCALE_SHIFT); + SET(reg, RK_PWM_CTRL_SCALE_MASK, + scaler << RK_PWM_CTRL_SCALE_SHIFT); + + RK_PWM_WRITE(sc, RK_PWM_CTRL, reg); + + sc->period = period; + sc->duty = duty; + + return (0); +} + +static int +rk_pwm_channel_get_config(device_t dev, u_int channel, u_int *period, u_int *duty) +{ + struct rk_pwm_softc *sc; + + sc = device_get_softc(dev); + + *period = sc->period; + *duty = sc->duty; + + return (0); +} + +static int +rk_pwm_channel_enable(device_t dev, u_int channel, bool enable) +{ + struct rk_pwm_softc *sc; + uint32_t reg; + + sc = device_get_softc(dev); + + if (enable && sc->enabled) + return (0); + + reg = RK_PWM_READ(sc, RK_PWM_CTRL); + SET(reg, RK_PWM_CTRL_ENABLE_MASK, enable); + + RK_PWM_WRITE(sc, RK_PWM_CTRL, reg); + + sc->enabled = enable; + + return (0); +} + +static int +rk_pwm_channel_is_enabled(device_t dev, u_int channel, bool *enabled) +{ + struct rk_pwm_softc *sc; + + sc = device_get_softc(dev); + + *enabled = sc->enabled; + + return (0); +} + +static device_method_t rk_pwm_methods[] = { + /* Device interface */ + DEVMETHOD(device_probe, rk_pwm_probe), + DEVMETHOD(device_attach, rk_pwm_attach), + DEVMETHOD(device_detach, rk_pwm_detach), + + /* ofw_bus interface */ + DEVMETHOD(ofw_bus_get_node, aw_pwm_get_node), + + /* pwm interface */ + DEVMETHOD(pwmbus_channel_count, rk_pwm_channel_count), + DEVMETHOD(pwmbus_channel_config, rk_pwm_channel_config), + DEVMETHOD(pwmbus_channel_get_config, rk_pwm_channel_get_config), + DEVMETHOD(pwmbus_channel_enable, rk_pwm_channel_enable), + DEVMETHOD(pwmbus_channel_is_enabled, rk_pwm_channel_is_enabled), + + DEVMETHOD_END +}; + +static driver_t rk_pwm_driver = { + "pwm", + rk_pwm_methods, + sizeof(struct rk_pwm_softc), +}; + +static devclass_t rk_pwm_devclass; + +DRIVER_MODULE(rk_pwm, simplebus, rk_pwm_driver, rk_pwm_devclass, 0, 0); +SIMPLEBUS_PNP_INFO(compat_data); Modified: head/sys/conf/files.arm64 ============================================================================== --- head/sys/conf/files.arm64 Thu Jan 16 21:21:20 2020 (r356807) +++ head/sys/conf/files.arm64 Thu Jan 16 21:25:13 2020 (r356808) @@ -312,6 +312,7 @@ arm64/rockchip/rk_typec_phy.c optional fdt rk_typec_p arm64/rockchip/if_dwc_rk.c optional fdt dwc_rk soc_rockchip_rk3328 | fdt dwc_rk soc_rockchip_rk3399 arm64/rockchip/rk_tsadc_if.m optional fdt soc_rockchip_rk3399 arm64/rockchip/rk_tsadc.c optional fdt soc_rockchip_rk3399 +arm64/rockchip/rk_pwm.c optional fdt rk_pwm arm64/rockchip/rk_pcie.c optional fdt pci soc_rockchip_rk3399 arm64/rockchip/rk_pcie_phy.c optional fdt pci soc_rockchip_rk3399 dev/dwc/if_dwc.c optional fdt dwc_rk soc_rockchip_rk3328 | fdt dwc_rk soc_rockchip_rk3399 _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
