1 /* $NetBSD: imx_com.c,v 1.3 2021/01/27 03:10:20 thorpej Exp $ */
2 /*-
3 * Copyright (c) 2019 Genetec Corporation. All rights reserved.
4 * Written by Hashimoto Kenichi for Genetec Corporation.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
20 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
22 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 __KERNEL_RCSID(0, "$NetBSD: imx_com.c,v 1.3 2021/01/27 03:10:20 thorpej Exp $");
30
31 #include "opt_fdt.h"
32 #include "opt_imxuart.h"
33
34 #include <sys/param.h>
35 #include <sys/bus.h>
36 #include <sys/device.h>
37
38 #include <dev/fdt/fdtvar.h>
39
40 #include <arm/imx/imxuartreg.h>
41 #include <arm/imx/imxuartvar.h>
42
43 static int imx_com_match(device_t, struct cfdata *, void *);
44 static void imx_com_attach(device_t, device_t, void *);
45
46 CFATTACH_DECL_NEW(imx_com, sizeof(struct imxuart_softc),
47 imx_com_match, imx_com_attach, NULL, NULL);
48
49 static const struct device_compatible_entry compat_data[] = {
50 { .compat = "fsl,imx6q-uart" },
51 DEVICE_COMPAT_EOL
52 };
53
54 static int
imx_com_match(device_t parent,struct cfdata * cf,void * aux)55 imx_com_match(device_t parent, struct cfdata *cf, void *aux)
56 {
57 struct fdt_attach_args * const faa = aux;
58
59 return of_compatible_match(faa->faa_phandle, compat_data);
60 }
61
62 static void
imx_com_attach(device_t parent,device_t self,void * aux)63 imx_com_attach(device_t parent, device_t self, void *aux)
64 {
65 struct imxuart_softc *sc = device_private(self);
66 struct imxuart_regs *regsp = &sc->sc_regs;
67 struct fdt_attach_args *faa = aux;
68 const int phandle = faa->faa_phandle;
69 bus_space_tag_t bst = faa->faa_bst;
70 bus_space_handle_t bsh;
71 char intrstr[128];
72 struct clk *per;
73 bus_addr_t addr;
74 bus_size_t size;
75
76 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
77 aprint_error(": couldn't get registers\n");
78 return;
79 }
80
81 if (bus_space_map(bst, addr, size, 0, &bsh) != 0) {
82 aprint_error(": couldn't map registers\n");
83 return;
84 }
85
86 if (fdtbus_clock_enable(phandle, "ipg", false) != 0) {
87 aprint_error(": couldn't enable ipg clock\n");
88 return;
89 }
90
91 per = fdtbus_clock_get(phandle, "per");
92 if (per != NULL && clk_enable(per) != 0) {
93 aprint_error(": couldn't enable per clock\n");
94 return;
95 }
96
97 sc->sc_dev = self;
98 regsp->ur_iot = bst;
99 regsp->ur_iobase = addr;
100 regsp->ur_ioh = bsh;
101
102 if (per != NULL) {
103 aprint_normal(", %u Hz", clk_get_rate(per));
104 /* XXX */
105 imxuart_set_frequency(clk_get_rate(per), 2);
106 }
107
108 if (imxuart_is_console(regsp->ur_iot, regsp->ur_iobase, ®sp->ur_ioh))
109 aprint_normal(" (console)");
110
111 aprint_normal("\n");
112
113 if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
114 aprint_error_dev(self, "failed to decode interrupt\n");
115 return;
116 }
117
118 sc->sc_ih = fdtbus_intr_establish_xname(phandle, 0, IPL_SERIAL,
119 0, imxuintr, sc, device_xname(self));
120 if (sc->sc_ih == NULL) {
121 aprint_error_dev(self, "failed to establish interrupt\n");
122 return;
123 }
124
125 aprint_normal_dev(self, "interrupting on %s\n", intrstr);
126
127 imxuart_attach_subr(sc);
128 }
129
130 /*
131 * Console support
132 */
133
134 static int
imx_com_console_match(int phandle)135 imx_com_console_match(int phandle)
136 {
137 return of_compatible_match(phandle, compat_data);
138 }
139
140 static void
imx_com_console_consinit(struct fdt_attach_args * faa,u_int uart_freq)141 imx_com_console_consinit(struct fdt_attach_args *faa, u_int uart_freq)
142 {
143 const int phandle = faa->faa_phandle;
144 bus_space_tag_t bst = faa->faa_bst;
145 bus_addr_t addr;
146 bus_size_t size;
147 tcflag_t flags;
148 int speed;
149
150 fdtbus_get_reg(phandle, 0, &addr, &size);
151 speed = fdtbus_get_stdout_speed();
152 if (speed < 0)
153 speed = 115200; /* default */
154 flags = fdtbus_get_stdout_flags();
155
156 imxuart_set_frequency(uart_freq, 2);
157 if (imxuart_cnattach(bst, addr, speed, flags) != 0)
158 panic("cannot attach console UART");
159 }
160
161 static const struct fdt_console imx_com_console = {
162 .match = imx_com_console_match,
163 .consinit = imx_com_console_consinit,
164 };
165
166 FDT_CONSOLE(imx_com, &imx_com_console);
167