diff options
Diffstat (limited to 'sys/arm/ti/ti_prm.c')
| -rw-r--r-- | sys/arm/ti/ti_prm.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/sys/arm/ti/ti_prm.c b/sys/arm/ti/ti_prm.c new file mode 100644 index 000000000000..4a57fbb8b972 --- /dev/null +++ b/sys/arm/ti/ti_prm.c @@ -0,0 +1,210 @@ +/*- + * Copyright (c) 2020 Oskar Holmlund <oskar.holmlund@ohdata.se> + * + * 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. + * + * $FreeBSD$ + */ +/* + * Power management - simple driver to handle reset and give access to + * memory space region for other drivers through prcm driver. + * Documentation/devicetree/binding/arm/omap/prm-inst.txt + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/module.h> + +#include <dev/fdt/simplebus.h> + +#include <dev/ofw/ofw_bus_subr.h> + +#include <arm/ti/ti_prcm.h> +#include <arm/ti/ti_prm.h> + +#if 0 +#define DPRINTF(dev, msg...) device_printf(dev, msg) +#else +#define DPRINTF(dev, msg...) +#endif + +/* relative to prcm address range */ +#define TI_PRM_PER_RSTCTRL 0xC00 + +struct ti_prm_softc { + device_t dev; + uint8_t type; + bool has_reset; +}; + +/* Device */ +#define TI_OMAP_PRM_INST 10 + +#define TI_AM3_PRM_INST 5 +#define TI_AM4_PRM_INST 4 +#define TI_OMAP4_PRM_INST 3 +#define TI_OMAP5_PRM_INST 2 +#define TI_DRA7_PRM_INST 1 +#define TI_END 0 + +static struct ofw_compat_data compat_data[] = { + { "ti,am3-prm-inst", TI_AM3_PRM_INST }, + { "ti,am4-prm-inst", TI_AM4_PRM_INST }, + { "ti,omap4-prm-inst", TI_OMAP4_PRM_INST }, + { "ti,omap5-prm-inst", TI_OMAP5_PRM_INST }, + { "ti,dra7-prm-inst", TI_DRA7_PRM_INST }, + { NULL, TI_END } +}; + +static struct ofw_compat_data required_data[] = { + { "ti,omap-prm-inst", TI_OMAP_PRM_INST }, + { NULL, TI_END } +}; + +/* device interface */ +static int +ti_prm_probe(device_t dev) +{ + if (!ofw_bus_status_okay(dev)) + return (ENXIO); + + if (ofw_bus_search_compatible(dev, required_data)->ocd_data == 0) + return (ENXIO); + + if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) + return (ENXIO); + + device_set_desc(dev, "TI OMAP Power Management"); + return(BUS_PROBE_DEFAULT); +} + +static int +ti_prm_attach(device_t dev) +{ + struct ti_prm_softc *sc; + phandle_t node; + + sc = device_get_softc(dev); + sc->dev = dev; + sc->type = ofw_bus_search_compatible(dev, compat_data)->ocd_data; + + node = ofw_bus_get_node(sc->dev); + + if (OF_hasprop(node, "#reset-cells")) { + sc->has_reset = true; + } else + sc->has_reset = false; + + /* Make device visible for other drivers */ + OF_device_register_xref(OF_xref_from_node(node), sc->dev); + + return (0); +} + +static int +ti_prm_detach(device_t dev) { + return (EBUSY); +} + +int +ti_prm_reset(device_t dev) +{ + struct ti_prm_softc *sc; + int err; + + sc = device_get_softc(dev); + if (sc->has_reset == false) + return 1; + + err = ti_prm_modify_4(dev, TI_PRM_PER_RSTCTRL, 0x2, 0x00); + return (err); +} + +int +ti_prm_write_4(device_t dev, bus_addr_t addr, uint32_t val) +{ + struct ti_prm_softc *sc; + device_t parent; + + parent = device_get_parent(dev); + sc = device_get_softc(dev); + DPRINTF(sc->dev, "offset=%lx write %x\n", addr, val); + ti_prcm_device_lock(parent); + ti_prcm_write_4(parent, addr, val); + ti_prcm_device_unlock(parent); + return (0); +} + +int +ti_prm_read_4(device_t dev, bus_addr_t addr, uint32_t *val) +{ + struct ti_prm_softc *sc; + device_t parent; + + parent = device_get_parent(dev); + sc = device_get_softc(dev); + + ti_prcm_device_lock(parent); + ti_prcm_read_4(parent, addr, val); + ti_prcm_device_unlock(parent); + DPRINTF(sc->dev, "offset=%lx Read %x\n", addr, *val); + return (0); +} + +int +ti_prm_modify_4(device_t dev, bus_addr_t addr, uint32_t clr, uint32_t set) +{ + struct ti_prm_softc *sc; + device_t parent; + + parent = device_get_parent(dev); + sc = device_get_softc(dev); + + ti_prcm_device_lock(parent); + ti_prcm_modify_4(parent, addr, clr, set); + ti_prcm_device_unlock(parent); + DPRINTF(sc->dev, "offset=%lx (clr %x set %x)\n", addr, clr, set); + + return (0); +} + +static device_method_t ti_prm_methods[] = { + DEVMETHOD(device_probe, ti_prm_probe), + DEVMETHOD(device_attach, ti_prm_attach), + DEVMETHOD(device_detach, ti_prm_detach), + + DEVMETHOD_END +}; + +DEFINE_CLASS_1(ti_prm, ti_prm_driver, ti_prm_methods, + sizeof(struct ti_prm_softc), simplebus_driver); + +static devclass_t ti_prm_devclass; + +EARLY_DRIVER_MODULE(ti_prm, simplebus, ti_prm_driver, + ti_prm_devclass, 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE); +MODULE_VERSION(ti_prm, 1); +MODULE_DEPEND(ti_prm, ti_sysc, 1, 1, 1); |