1 /* $NetBSD: imx6_ocotp.c,v 1.3 2024/02/07 04:20:27 msaitoh Exp $ */
2
3 /*
4 * Copyright (c) 2014 Ryo Shimizu
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
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
25 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 /*
30 * i.MX6 On-Chip OTP Controller
31 */
32
33 #include <sys/cdefs.h>
34 __KERNEL_RCSID(0, "$NetBSD: imx6_ocotp.c,v 1.3 2024/02/07 04:20:27 msaitoh Exp $");
35
36 #include <sys/bus.h>
37 #include <sys/device.h>
38 #include <sys/param.h>
39
40 #include <dev/fdt/fdtvar.h>
41
42 #include <arm/nxp/imx6_ocotpreg.h>
43 #include <arm/nxp/imx6_ocotpvar.h>
44
45 struct imxocotp_softc {
46 device_t sc_dev;
47
48 bus_addr_t sc_addr;
49 bus_space_tag_t sc_iot;
50 bus_space_handle_t sc_ioh;
51 bus_size_t sc_ios;
52
53 struct clk *sc_clk;
54
55 };
56
57 static struct imxocotp_softc *ocotp_softc;
58
59 static int imxocotp_match(device_t, struct cfdata *, void *);
60 static void imxocotp_attach(device_t, device_t, void *);
61
62 CFATTACH_DECL_NEW(imxocotp, sizeof(struct imxocotp_softc),
63 imxocotp_match, imxocotp_attach, NULL, NULL);
64
65 static const struct device_compatible_entry compat_data[] = {
66 { .compat = "fsl,imx6q-ocotp" },
67 { .compat = "fsl,imx6sl-ocotp" },
68 { .compat = "fsl,imx6sll-ocotp" },
69 { .compat = "fsl,imx6sx-ocotp" },
70 { .compat = "fsl,imx6ul-ocotp" },
71 { .compat = "fsl,imx6ull-ocotp" },
72 DEVICE_COMPAT_EOL
73 };
74
75 int
imxocotp_match(device_t parent,cfdata_t cf,void * aux)76 imxocotp_match(device_t parent, cfdata_t cf, void *aux)
77 {
78 struct fdt_attach_args * const faa = aux;
79
80 if (ocotp_softc != NULL)
81 return 0;
82
83 return of_compatible_match(faa->faa_phandle, compat_data);
84 }
85
86 /* ARGSUSED */
87 static void
imxocotp_attach(device_t parent,device_t self,void * aux)88 imxocotp_attach(device_t parent, device_t self, void *aux)
89 {
90 struct imxocotp_softc *sc = device_private(self);
91 struct fdt_attach_args * const faa = aux;
92 const int phandle = faa->faa_phandle;
93 bus_addr_t addr;
94 bus_size_t size;
95 int error;
96
97 sc->sc_iot = faa->faa_bst;
98 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
99 aprint_error(": couldn't get registers\n");
100 return;
101 }
102
103 sc->sc_clk = fdtbus_clock_get_index(phandle, 0);
104 if (sc->sc_clk == NULL) {
105 aprint_error(": couldn't get clock\n");
106 return;
107 }
108
109 error = clk_enable(sc->sc_clk);
110 if (error) {
111 aprint_error_dev(sc->sc_dev, "couldn't enable: %d\n", error);
112 return;
113 }
114
115 aprint_naive("\n");
116 aprint_normal(": On-Chip OTP Controller\n");
117 if (bus_space_map(sc->sc_iot, addr, size, 0, &sc->sc_ioh)) {
118 aprint_error_dev(self, "Cannot map registers\n");
119 return;
120 }
121 ocotp_softc = sc;
122 sc->sc_ios = size;
123
124 uint32_t v = imxocotp_read(OCOTP_VERSION);
125 aprint_normal_dev(self, "OCOTP_VERSION %d.%d.%d\n", (v >> 24) & 0xff, (v >> 16) & 0xff, v & 0xffff);
126
127 return;
128 }
129
130 uint32_t
imxocotp_read(uint32_t addr)131 imxocotp_read(uint32_t addr)
132 {
133 struct imxocotp_softc *sc = ocotp_softc;
134
135 if (sc == NULL)
136 return 0;
137
138 if (addr > sc->sc_ios)
139 return 0;
140
141 return bus_space_read_4(sc->sc_iot, sc->sc_ioh, addr);
142 }
143