2 * Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
19 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
21 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
22 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * Allwinner oscillator clock
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include <sys/param.h>
37 #include <sys/systm.h>
40 #include <sys/kernel.h>
42 #include <sys/module.h>
43 #include <sys/mutex.h>
44 #include <machine/bus.h>
46 #include <dev/fdt/simplebus.h>
48 #include <dev/ofw/ofw_bus.h>
49 #include <dev/ofw/ofw_bus_subr.h>
51 #include <dev/extres/clk/clk.h>
53 #include "clkdev_if.h"
55 #define CCU_BASE 0x01c20000
56 #define CCU_SIZE 0x400
59 struct simplebus_softc sc;
61 bus_space_handle_t bsh;
66 static struct ofw_compat_data compat_data[] = {
67 { "allwinner,sun7i-a20", 1 },
68 { "allwinner,sun6i-a31", 1 },
69 { "allwinner,sun6i-a31s", 1 },
74 aw_ccu_check_addr(struct aw_ccu_softc *sc, bus_addr_t addr,
75 bus_space_handle_t *pbsh, bus_size_t *poff)
77 if (addr >= CCU_BASE && addr < (CCU_BASE + CCU_SIZE)) {
78 *poff = addr - CCU_BASE;
86 aw_ccu_write_4(device_t dev, bus_addr_t addr, uint32_t val)
88 struct aw_ccu_softc *sc;
89 bus_space_handle_t bsh;
92 sc = device_get_softc(dev);
94 if (aw_ccu_check_addr(sc, addr, &bsh, ®) != 0)
97 mtx_assert(&sc->mtx, MA_OWNED);
98 bus_space_write_4(sc->bst, bsh, reg, val);
104 aw_ccu_read_4(device_t dev, bus_addr_t addr, uint32_t *val)
106 struct aw_ccu_softc *sc;
107 bus_space_handle_t bsh;
110 sc = device_get_softc(dev);
112 if (aw_ccu_check_addr(sc, addr, &bsh, ®) != 0)
115 mtx_assert(&sc->mtx, MA_OWNED);
116 *val = bus_space_read_4(sc->bst, bsh, reg);
122 aw_ccu_modify_4(device_t dev, bus_addr_t addr, uint32_t clr, uint32_t set)
124 struct aw_ccu_softc *sc;
125 bus_space_handle_t bsh;
129 sc = device_get_softc(dev);
131 if (aw_ccu_check_addr(sc, addr, &bsh, ®) != 0)
134 mtx_assert(&sc->mtx, MA_OWNED);
135 val = bus_space_read_4(sc->bst, bsh, reg);
138 bus_space_write_4(sc->bst, bsh, reg, val);
144 aw_ccu_device_lock(device_t dev)
146 struct aw_ccu_softc *sc;
148 sc = device_get_softc(dev);
153 aw_ccu_device_unlock(device_t dev)
155 struct aw_ccu_softc *sc;
157 sc = device_get_softc(dev);
158 mtx_unlock(&sc->mtx);
161 static const struct ofw_compat_data *
162 aw_ccu_search_compatible(void)
164 const struct ofw_compat_data *compat;
167 root = OF_finddevice("/");
168 for (compat = compat_data; compat->ocd_str != NULL; compat++)
169 if (ofw_bus_node_is_compatible(root, compat->ocd_str))
176 aw_ccu_probe(device_t dev)
180 name = ofw_bus_get_name(dev);
182 if (name == NULL || strcmp(name, "clocks") != 0)
185 if (aw_ccu_search_compatible()->ocd_data == 0)
188 device_set_desc(dev, "Allwinner Clock Control Unit");
189 return (BUS_PROBE_SPECIFIC);
193 aw_ccu_attach(device_t dev)
195 struct aw_ccu_softc *sc;
196 phandle_t node, child;
200 sc = device_get_softc(dev);
201 node = ofw_bus_get_node(dev);
203 simplebus_init(dev, node);
205 sc->flags = aw_ccu_search_compatible()->ocd_data;
208 * Map registers. The DT doesn't have a "reg" property
209 * for the /clocks node and child nodes have conflicting "reg"
212 sc->bst = bus_get_bus_tag(dev);
213 error = bus_space_map(sc->bst, CCU_BASE, CCU_SIZE, 0,
216 device_printf(dev, "couldn't map CCU: %d\n", error);
220 mtx_init(&sc->mtx, device_get_nameunit(dev), NULL, MTX_DEF);
222 /* Attach child devices */
223 for (child = OF_child(node); child > 0; child = OF_peer(child)) {
224 cdev = simplebus_add_device(dev, child, 0, NULL, -1, NULL);
226 device_probe_and_attach(cdev);
229 return (bus_generic_attach(dev));
232 static device_method_t aw_ccu_methods[] = {
233 /* Device interface */
234 DEVMETHOD(device_probe, aw_ccu_probe),
235 DEVMETHOD(device_attach, aw_ccu_attach),
237 /* clkdev interface */
238 DEVMETHOD(clkdev_write_4, aw_ccu_write_4),
239 DEVMETHOD(clkdev_read_4, aw_ccu_read_4),
240 DEVMETHOD(clkdev_modify_4, aw_ccu_modify_4),
241 DEVMETHOD(clkdev_device_lock, aw_ccu_device_lock),
242 DEVMETHOD(clkdev_device_unlock, aw_ccu_device_unlock),
247 DEFINE_CLASS_1(aw_ccu, aw_ccu_driver, aw_ccu_methods,
248 sizeof(struct aw_ccu_softc), simplebus_driver);
250 static devclass_t aw_ccu_devclass;
252 EARLY_DRIVER_MODULE(aw_ccu, simplebus, aw_ccu_driver, aw_ccu_devclass,
253 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
255 MODULE_VERSION(aw_ccu, 1);