2 * Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca>
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
27 * Allwinner oscillator clock
30 #include <sys/cdefs.h>
31 #include <sys/param.h>
32 #include <sys/systm.h>
35 #include <sys/kernel.h>
37 #include <sys/module.h>
38 #include <sys/mutex.h>
39 #include <machine/bus.h>
41 #include <dev/fdt/simplebus.h>
43 #include <dev/ofw/ofw_bus.h>
44 #include <dev/ofw/ofw_bus_subr.h>
46 #include <dev/extres/clk/clk.h>
48 #include "clkdev_if.h"
50 #define CCU_BASE 0x01c20000
51 #define CCU_SIZE 0x400
54 struct simplebus_softc sc;
56 bus_space_handle_t bsh;
61 static struct ofw_compat_data compat_data[] = {
62 { "allwinner,sun7i-a20", 1 },
63 { "allwinner,sun6i-a31", 1 },
64 { "allwinner,sun6i-a31s", 1 },
69 aw_ccu_check_addr(struct aw_ccu_softc *sc, bus_addr_t addr,
70 bus_space_handle_t *pbsh, bus_size_t *poff)
72 if (addr >= CCU_BASE && addr < (CCU_BASE + CCU_SIZE)) {
73 *poff = addr - CCU_BASE;
81 aw_ccu_write_4(device_t dev, bus_addr_t addr, uint32_t val)
83 struct aw_ccu_softc *sc;
84 bus_space_handle_t bsh;
87 sc = device_get_softc(dev);
89 if (aw_ccu_check_addr(sc, addr, &bsh, ®) != 0)
92 mtx_assert(&sc->mtx, MA_OWNED);
93 bus_space_write_4(sc->bst, bsh, reg, val);
99 aw_ccu_read_4(device_t dev, bus_addr_t addr, uint32_t *val)
101 struct aw_ccu_softc *sc;
102 bus_space_handle_t bsh;
105 sc = device_get_softc(dev);
107 if (aw_ccu_check_addr(sc, addr, &bsh, ®) != 0)
110 mtx_assert(&sc->mtx, MA_OWNED);
111 *val = bus_space_read_4(sc->bst, bsh, reg);
117 aw_ccu_modify_4(device_t dev, bus_addr_t addr, uint32_t clr, uint32_t set)
119 struct aw_ccu_softc *sc;
120 bus_space_handle_t bsh;
124 sc = device_get_softc(dev);
126 if (aw_ccu_check_addr(sc, addr, &bsh, ®) != 0)
129 mtx_assert(&sc->mtx, MA_OWNED);
130 val = bus_space_read_4(sc->bst, bsh, reg);
133 bus_space_write_4(sc->bst, bsh, reg, val);
139 aw_ccu_device_lock(device_t dev)
141 struct aw_ccu_softc *sc;
143 sc = device_get_softc(dev);
148 aw_ccu_device_unlock(device_t dev)
150 struct aw_ccu_softc *sc;
152 sc = device_get_softc(dev);
153 mtx_unlock(&sc->mtx);
156 static const struct ofw_compat_data *
157 aw_ccu_search_compatible(void)
159 const struct ofw_compat_data *compat;
162 root = OF_finddevice("/");
163 for (compat = compat_data; compat->ocd_str != NULL; compat++)
164 if (ofw_bus_node_is_compatible(root, compat->ocd_str))
171 aw_ccu_probe(device_t dev)
175 name = ofw_bus_get_name(dev);
177 if (name == NULL || strcmp(name, "clocks") != 0)
180 if (aw_ccu_search_compatible()->ocd_data == 0)
183 device_set_desc(dev, "Allwinner Clock Control Unit");
184 return (BUS_PROBE_SPECIFIC);
188 aw_ccu_attach(device_t dev)
190 struct aw_ccu_softc *sc;
191 phandle_t node, child;
195 sc = device_get_softc(dev);
196 node = ofw_bus_get_node(dev);
198 simplebus_init(dev, node);
200 sc->flags = aw_ccu_search_compatible()->ocd_data;
203 * Map registers. The DT doesn't have a "reg" property
204 * for the /clocks node and child nodes have conflicting "reg"
207 sc->bst = bus_get_bus_tag(dev);
208 error = bus_space_map(sc->bst, CCU_BASE, CCU_SIZE, 0,
211 device_printf(dev, "couldn't map CCU: %d\n", error);
215 mtx_init(&sc->mtx, device_get_nameunit(dev), NULL, MTX_DEF);
217 /* Attach child devices */
218 for (child = OF_child(node); child > 0; child = OF_peer(child)) {
219 cdev = simplebus_add_device(dev, child, 0, NULL, -1, NULL);
221 device_probe_and_attach(cdev);
224 return (bus_generic_attach(dev));
227 static device_method_t aw_ccu_methods[] = {
228 /* Device interface */
229 DEVMETHOD(device_probe, aw_ccu_probe),
230 DEVMETHOD(device_attach, aw_ccu_attach),
232 /* clkdev interface */
233 DEVMETHOD(clkdev_write_4, aw_ccu_write_4),
234 DEVMETHOD(clkdev_read_4, aw_ccu_read_4),
235 DEVMETHOD(clkdev_modify_4, aw_ccu_modify_4),
236 DEVMETHOD(clkdev_device_lock, aw_ccu_device_lock),
237 DEVMETHOD(clkdev_device_unlock, aw_ccu_device_unlock),
242 DEFINE_CLASS_1(aw_ccu, aw_ccu_driver, aw_ccu_methods,
243 sizeof(struct aw_ccu_softc), simplebus_driver);
245 EARLY_DRIVER_MODULE(aw_ccu, simplebus, aw_ccu_driver, 0, 0,
246 BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
248 MODULE_VERSION(aw_ccu, 1);