2 * Copyright (c) 2020 Oskar Holmlund <oskar.holmlund@ohdata.se>
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
18 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
20 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
21 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * Power management - simple driver to handle reset and give access to
29 * memory space region for other drivers through prcm driver.
30 * Documentation/devicetree/binding/arm/omap/prm-inst.txt
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/kernel.h>
39 #include <sys/module.h>
41 #include <dev/fdt/simplebus.h>
43 #include <dev/ofw/ofw_bus_subr.h>
45 #include <arm/ti/ti_prcm.h>
46 #include <arm/ti/ti_prm.h>
49 #define DPRINTF(dev, msg...) device_printf(dev, msg)
51 #define DPRINTF(dev, msg...)
54 /* relative to prcm address range */
55 #define TI_PRM_PER_RSTCTRL 0xC00
64 #define TI_OMAP_PRM_INST 10
66 #define TI_AM3_PRM_INST 5
67 #define TI_AM4_PRM_INST 4
68 #define TI_OMAP4_PRM_INST 3
69 #define TI_OMAP5_PRM_INST 2
70 #define TI_DRA7_PRM_INST 1
73 static struct ofw_compat_data compat_data[] = {
74 { "ti,am3-prm-inst", TI_AM3_PRM_INST },
75 { "ti,am4-prm-inst", TI_AM4_PRM_INST },
76 { "ti,omap4-prm-inst", TI_OMAP4_PRM_INST },
77 { "ti,omap5-prm-inst", TI_OMAP5_PRM_INST },
78 { "ti,dra7-prm-inst", TI_DRA7_PRM_INST },
82 static struct ofw_compat_data required_data[] = {
83 { "ti,omap-prm-inst", TI_OMAP_PRM_INST },
87 /* device interface */
89 ti_prm_probe(device_t dev)
91 if (!ofw_bus_status_okay(dev))
94 if (ofw_bus_search_compatible(dev, required_data)->ocd_data == 0)
97 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
100 device_set_desc(dev, "TI OMAP Power Management");
101 return(BUS_PROBE_DEFAULT);
105 ti_prm_attach(device_t dev)
107 struct ti_prm_softc *sc;
110 sc = device_get_softc(dev);
112 sc->type = ofw_bus_search_compatible(dev, compat_data)->ocd_data;
114 node = ofw_bus_get_node(sc->dev);
116 if (OF_hasprop(node, "#reset-cells")) {
117 sc->has_reset = true;
119 sc->has_reset = false;
121 /* Make device visible for other drivers */
122 OF_device_register_xref(OF_xref_from_node(node), sc->dev);
128 ti_prm_detach(device_t dev) {
133 ti_prm_reset(device_t dev)
135 struct ti_prm_softc *sc;
138 sc = device_get_softc(dev);
139 if (sc->has_reset == false)
142 err = ti_prm_modify_4(dev, TI_PRM_PER_RSTCTRL, 0x2, 0x00);
147 ti_prm_write_4(device_t dev, bus_addr_t addr, uint32_t val)
151 parent = device_get_parent(dev);
152 DPRINTF(dev, "offset=%lx write %x\n", addr, val);
153 ti_prcm_device_lock(parent);
154 ti_prcm_write_4(parent, addr, val);
155 ti_prcm_device_unlock(parent);
160 ti_prm_read_4(device_t dev, bus_addr_t addr, uint32_t *val)
164 parent = device_get_parent(dev);
166 ti_prcm_device_lock(parent);
167 ti_prcm_read_4(parent, addr, val);
168 ti_prcm_device_unlock(parent);
169 DPRINTF(dev, "offset=%lx Read %x\n", addr, *val);
174 ti_prm_modify_4(device_t dev, bus_addr_t addr, uint32_t clr, uint32_t set)
178 parent = device_get_parent(dev);
180 ti_prcm_device_lock(parent);
181 ti_prcm_modify_4(parent, addr, clr, set);
182 ti_prcm_device_unlock(parent);
183 DPRINTF(dev, "offset=%lx (clr %x set %x)\n", addr, clr, set);
188 static device_method_t ti_prm_methods[] = {
189 DEVMETHOD(device_probe, ti_prm_probe),
190 DEVMETHOD(device_attach, ti_prm_attach),
191 DEVMETHOD(device_detach, ti_prm_detach),
196 DEFINE_CLASS_1(ti_prm, ti_prm_driver, ti_prm_methods,
197 sizeof(struct ti_prm_softc), simplebus_driver);
199 EARLY_DRIVER_MODULE(ti_prm, simplebus, ti_prm_driver, 0, 0,
200 BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
201 MODULE_VERSION(ti_prm, 1);
202 MODULE_DEPEND(ti_prm, ti_sysc, 1, 1, 1);