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/*-
* 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);
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