1 /* $NetBSD: vexpress_sysreg.c,v 1.4 2021/01/27 03:10:20 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: vexpress_sysreg.c,v 1.4 2021/01/27 03:10:20 thorpej Exp $");
31
32 #include <sys/param.h>
33 #include <sys/bus.h>
34 #include <sys/device.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37
38 #include <dev/fdt/fdtvar.h>
39
40 #define SYS_CFGDATA 0x00a0
41 #define SYS_CFGCTRL 0x00a4
42 #define SYS_CFGCTRL_START __BIT(31)
43 #define SYS_CFGCTRL_WRITE __BIT(30)
44 #define SYS_CFGCTRL_FUNCTION __BITS(25,20)
45 #define SYS_CFGCTRL_FUNCTION_SHUTDOWN 8
46 #define SYS_CFGCTRL_FUNCTION_REBOOT 9
47 #define SYS_CFGCTRL_SITE __BITS(17,16)
48 #define SYS_CFGCTRL_SITE_MB 0
49 #define SYS_CFGSTAT 0x00a8
50
51 static int vexpress_sysreg_match(device_t, cfdata_t, void *);
52 static void vexpress_sysreg_attach(device_t, device_t, void *);
53
54 static const struct device_compatible_entry compat_data[] = {
55 { .compat = "arm,vexpress-sysreg" },
56 DEVICE_COMPAT_EOL
57 };
58
59 struct vexpress_sysreg_softc {
60 device_t sc_dev;
61 bus_space_tag_t sc_bst;
62 bus_space_handle_t sc_bsh;
63 };
64
65 CFATTACH_DECL_NEW(vexpress_sysreg, sizeof(struct vexpress_sysreg_softc),
66 vexpress_sysreg_match, vexpress_sysreg_attach, NULL, NULL);
67
68 static void
vexpress_sysreg_write(device_t dev,u_int func,u_int site)69 vexpress_sysreg_write(device_t dev, u_int func, u_int site)
70 {
71 struct vexpress_sysreg_softc * const sc = device_private(dev);
72
73 const uint32_t cfgctrl = SYS_CFGCTRL_START | SYS_CFGCTRL_WRITE |
74 __SHIFTIN(func, SYS_CFGCTRL_FUNCTION) |
75 __SHIFTIN(site, SYS_CFGCTRL_SITE);
76
77 bus_space_write_4(sc->sc_bst, sc->sc_bsh, SYS_CFGSTAT, 0);
78 bus_space_write_4(sc->sc_bst, sc->sc_bsh, SYS_CFGDATA, 0);
79 bus_space_write_4(sc->sc_bst, sc->sc_bsh, SYS_CFGCTRL, cfgctrl);
80 }
81
82 static void
vexpress_sysreg_reset(device_t dev)83 vexpress_sysreg_reset(device_t dev)
84 {
85 delay(1000000);
86 vexpress_sysreg_write(dev, SYS_CFGCTRL_FUNCTION_REBOOT, SYS_CFGCTRL_SITE_MB);
87 }
88
89 static void
vexpress_sysreg_poweroff(device_t dev)90 vexpress_sysreg_poweroff(device_t dev)
91 {
92 delay(1000000);
93 vexpress_sysreg_write(dev, SYS_CFGCTRL_FUNCTION_SHUTDOWN, SYS_CFGCTRL_SITE_MB);
94 }
95
96 static struct fdtbus_power_controller_func vexpress_sysreg_power_funcs = {
97 .reset = vexpress_sysreg_reset,
98 .poweroff = vexpress_sysreg_poweroff,
99 };
100
101 static int
vexpress_sysreg_match(device_t parent,cfdata_t cf,void * aux)102 vexpress_sysreg_match(device_t parent, cfdata_t cf, void *aux)
103 {
104 struct fdt_attach_args * const faa = aux;
105
106 return of_compatible_match(faa->faa_phandle, compat_data);
107 }
108
109 static void
vexpress_sysreg_attach(device_t parent,device_t self,void * aux)110 vexpress_sysreg_attach(device_t parent, device_t self, void *aux)
111 {
112 struct vexpress_sysreg_softc * const sc = device_private(self);
113 struct fdt_attach_args * const faa = aux;
114 const int phandle = faa->faa_phandle;
115 bus_addr_t addr;
116 bus_size_t size;
117
118 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
119 aprint_error(": missing 'reg' property\n");
120 return;
121 }
122
123 sc->sc_dev = self;
124 sc->sc_bst = faa->faa_bst;
125 if (bus_space_map(faa->faa_bst, addr, size, 0, &sc->sc_bsh)) {
126 aprint_error(": couldn't map device\n");
127 return;
128 }
129
130 aprint_naive("\n");
131 aprint_normal("\n");
132
133 fdtbus_register_power_controller(self, phandle,
134 &vexpress_sysreg_power_funcs);
135 }
136