cycv_rstmgr.c revision 1.3 1 /* $NetBSD: cycv_rstmgr.c,v 1.3 2019/10/18 06:50:08 skrll Exp $ */
2
3 /* This file is in the public domain. */
4
5 #include <sys/cdefs.h>
6 __KERNEL_RCSID(0, "$NetBSD: cycv_rstmgr.c,v 1.3 2019/10/18 06:50:08 skrll Exp $");
7
8 #include <sys/param.h>
9 #include <sys/bus.h>
10 #include <sys/device.h>
11 #include <sys/intr.h>
12 #include <sys/systm.h>
13 #include <sys/kernel.h>
14 #include <sys/atomic.h>
15 #include <sys/kmem.h>
16
17 #include <arm/altera/cycv_reg.h>
18 #include <arm/altera/cycv_var.h>
19
20 #include <dev/fdt/fdtvar.h>
21
22 static int cycv_rstmgr_match(device_t, cfdata_t, void *);
23 static void cycv_rstmgr_attach(device_t, device_t, void *);
24
25 static void *cycv_rst_acquire(device_t, const void *, size_t);
26 static void cycv_rst_release(device_t, void *);
27 static int cycv_rst_reset_assert(device_t, void *);
28 static int cycv_rst_reset_deassert(device_t, void *);
29
30 static const struct fdtbus_reset_controller_func cycv_rstmgr_funcs = {
31 cycv_rst_acquire, cycv_rst_release,
32 cycv_rst_reset_assert, cycv_rst_reset_deassert
33 };
34
35 struct cycv_rstmgr_softc {
36 device_t sc_dev;
37
38 bus_space_tag_t sc_bst;
39 bus_space_handle_t sc_bsh;
40 };
41
42 struct cycv_reset {
43 bus_addr_t address;
44 uint32_t mask;
45 };
46
47 CFATTACH_DECL_NEW(cycvrstmgr, sizeof (struct cycv_rstmgr_softc),
48 cycv_rstmgr_match, cycv_rstmgr_attach, NULL, NULL);
49
50 static struct cycv_rstmgr_softc *cycv_rstmgr_sc;
51
52 static int
53 cycv_rstmgr_match(device_t parent, cfdata_t cf, void *aux)
54 {
55 const char *compatible[] = { "altr,rst-mgr", NULL };
56 struct fdt_attach_args *faa = aux;
57
58 return of_match_compatible(faa->faa_phandle, compatible);
59 }
60
61 static void
62 cycv_rstmgr_attach(device_t parent, device_t self, void *aux)
63 {
64 struct cycv_rstmgr_softc *sc = device_private(self);
65 struct fdt_attach_args *faa = aux;
66 int phandle = faa->faa_phandle;
67 bus_addr_t addr;
68 bus_size_t size;
69 int error;
70
71 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
72 aprint_error(": couldn't get registers\n");
73 return;
74 }
75
76 sc->sc_dev = self;
77 sc->sc_bst = faa->faa_bst;
78 error = bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh);
79 if (error) {
80 aprint_error(": couldn't map %#" PRIxBUSADDR ": %d",
81 addr, error);
82 return;
83 }
84
85 aprint_normal(": reset manager\n");
86
87 fdtbus_register_reset_controller(self, phandle, &cycv_rstmgr_funcs);
88 cycv_rstmgr_sc = sc;
89 }
90
91 static void *
92 cycv_rst_acquire(device_t dev, const void *data, size_t len) {
93 struct cycv_reset *reset = NULL;
94 uint32_t value;
95
96 if (len != sizeof value)
97 goto err_decode;
98
99 value = of_decode_int(data);
100 if (value < 0 || value >
101 (CYCV_RSTMGR_MISCMODRST - CYCV_RSTMGR_MPUMODRST + 4) / 4 * 32)
102 goto err_decode;
103
104 reset = kmem_alloc(sizeof *reset, KM_SLEEP);
105 reset->address = CYCV_RSTMGR_MPUMODRST + value / 32 * 4;
106 reset->mask = 1 << (value % 32);
107
108 if (0) {
109 err_decode:
110 aprint_debug_dev(dev, "couln't decode reset\n");
111 }
112 return reset;
113 }
114
115 static void
116 cycv_rst_release(device_t dev, void *r) {
117 kmem_free(r, sizeof (struct cycv_reset));
118 }
119
120 static void
121 cycv_rst_reset_set(device_t dev, struct cycv_reset *reset, int set) {
122 struct cycv_rstmgr_softc *sc = device_private(dev);
123 uint32_t val = bus_space_read_4(sc->sc_bst, sc->sc_bsh, reset->address);
124
125 if (set)
126 val |= reset->mask;
127 else
128 val &= ~reset->mask;
129
130 bus_space_write_4(sc->sc_bst, sc->sc_bsh, reset->address, val);
131 }
132
133 static int
134 cycv_rst_reset_assert(device_t dev, void *r) {
135
136 cycv_rst_reset_set(dev, r, 1);
137
138 return 0;
139 }
140
141 static int
142 cycv_rst_reset_deassert(device_t dev, void *r) {
143
144 cycv_rst_reset_set(dev, r, 0);
145
146 return 0;
147 }
148