Annotation of src/sys/dev/fdt/dw_apb_uart.c, Revision 1.10
1.10 ! thorpej 1: /* $NetBSD: dw_apb_uart.c,v 1.9 2021/01/15 20:50:49 ryo Exp $ */
1.1 jmcneill 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26: * POSSIBILITY OF SUCH DAMAGE.
27: */
28:
29: #include <sys/cdefs.h>
30:
1.10 ! thorpej 31: __KERNEL_RCSID(1, "$NetBSD: dw_apb_uart.c,v 1.9 2021/01/15 20:50:49 ryo Exp $");
1.1 jmcneill 32:
33: #include <sys/param.h>
34: #include <sys/bus.h>
35: #include <sys/device.h>
36: #include <sys/intr.h>
37: #include <sys/systm.h>
38: #include <sys/time.h>
39: #include <sys/termios.h>
40:
41: #include <dev/ic/comvar.h>
42:
43: #include <dev/fdt/fdtvar.h>
44:
45: static int dw_apb_uart_match(device_t, cfdata_t, void *);
46: static void dw_apb_uart_attach(device_t, device_t, void *);
47:
1.10 ! thorpej 48: static const struct device_compatible_entry compat_data[] = {
! 49: { .compat = "snps,dw-apb-uart" },
! 50: DEVICE_COMPAT_EOL
1.1 jmcneill 51: };
52:
53: struct dw_apb_uart_softc {
54: struct com_softc ssc_sc;
55: void *ssc_ih;
56:
57: struct clk *ssc_clk;
1.2 jmcneill 58: struct clk *ssc_pclk;
1.1 jmcneill 59: struct fdtbus_reset *ssc_rst;
60: };
61:
62: CFATTACH_DECL_NEW(dw_apb_uart, sizeof(struct dw_apb_uart_softc),
63: dw_apb_uart_match, dw_apb_uart_attach, NULL, NULL);
64:
65: static int
66: dw_apb_uart_match(device_t parent, cfdata_t cf, void *aux)
67: {
68: struct fdt_attach_args * const faa = aux;
69:
1.10 ! thorpej 70: return of_compatible_match(faa->faa_phandle, compat_data);
1.1 jmcneill 71: }
72:
73: static void
74: dw_apb_uart_attach(device_t parent, device_t self, void *aux)
75: {
76: struct dw_apb_uart_softc * const ssc = device_private(self);
77: struct com_softc * const sc = &ssc->ssc_sc;
78: struct fdt_attach_args * const faa = aux;
1.6 jmcneill 79: bus_space_tag_t bst = faa->faa_bst;
1.1 jmcneill 80: bus_space_handle_t bsh;
81: char intrstr[128];
82: bus_addr_t addr;
83: bus_size_t size;
84: u_int reg_shift;
85: int error;
86:
87: if (fdtbus_get_reg(faa->faa_phandle, 0, &addr, &size) != 0) {
88: aprint_error(": couldn't get registers\n");
89: return;
90: }
91:
92: if (of_getprop_uint32(faa->faa_phandle, "reg-shift", ®_shift)) {
93: /* missing or bad reg-shift property, assume 2 */
1.6 jmcneill 94: reg_shift = 2;
1.1 jmcneill 95: }
96:
97: sc->sc_dev = self;
98:
99: ssc->ssc_clk = fdtbus_clock_get_index(faa->faa_phandle, 0);
100: if (ssc->ssc_clk == NULL) {
101: aprint_error(": couldn't get clock\n");
102: return;
103: }
104: if (clk_enable(ssc->ssc_clk) != 0) {
105: aprint_error(": couldn't enable clock\n");
106: return;
107: }
108:
1.2 jmcneill 109: ssc->ssc_pclk = fdtbus_clock_get(faa->faa_phandle, "apb_pclk");
110: if (ssc->ssc_pclk != NULL && clk_enable(ssc->ssc_pclk) != 0) {
111: aprint_error(": couldn't enable peripheral clock\n");
112: return;
113: }
114:
1.1 jmcneill 115: ssc->ssc_rst = fdtbus_reset_get_index(faa->faa_phandle, 0);
116: if (ssc->ssc_rst && fdtbus_reset_deassert(ssc->ssc_rst) != 0) {
117: aprint_error(": couldn't de-assert reset\n");
118: return;
119: }
120:
121: sc->sc_frequency = clk_get_rate(ssc->ssc_clk);
122: sc->sc_type = COM_TYPE_DW_APB;
123:
124: error = bus_space_map(bst, addr, size, 0, &bsh);
125: if (error) {
1.3 christos 126: aprint_error(": couldn't map %#" PRIx64 ": %d", (uint64_t)addr, error);
1.1 jmcneill 127: return;
128: }
129:
1.6 jmcneill 130: com_init_regs_stride(&sc->sc_regs, bst, bsh, addr, reg_shift);
1.1 jmcneill 131:
132: com_attach_subr(sc);
133:
134: if (!fdtbus_intr_str(faa->faa_phandle, 0, intrstr, sizeof(intrstr))) {
135: aprint_error_dev(self, "failed to decode interrupt\n");
136: return;
137: }
138:
1.9 ryo 139: ssc->ssc_ih = fdtbus_intr_establish_xname(faa->faa_phandle, 0,
140: IPL_SERIAL, FDT_INTR_MPSAFE, comintr, sc, device_xname(self));
1.1 jmcneill 141: if (ssc->ssc_ih == NULL) {
142: aprint_error_dev(self, "failed to establish interrupt on %s\n",
143: intrstr);
144: }
145: aprint_normal_dev(self, "interrupting on %s\n", intrstr);
146: }
147:
148: /*
149: * Console support
150: */
151:
152: static int
153: dw_apb_uart_console_match(int phandle)
154: {
1.10 ! thorpej 155: return of_compatible_match(phandle, compat_data);
1.1 jmcneill 156: }
157:
158: static void
159: dw_apb_uart_console_consinit(struct fdt_attach_args *faa, u_int uart_freq)
160: {
161: const int phandle = faa->faa_phandle;
1.6 jmcneill 162: bus_space_tag_t bst = faa->faa_bst;
163: bus_space_handle_t dummy_bsh;
164: struct com_regs regs;
1.1 jmcneill 165: bus_addr_t addr;
166: tcflag_t flags;
1.6 jmcneill 167: u_int reg_shift;
1.1 jmcneill 168: int speed;
169:
170: fdtbus_get_reg(phandle, 0, &addr, NULL);
171: speed = fdtbus_get_stdout_speed();
172: if (speed < 0)
173: speed = 115200; /* default */
174: flags = fdtbus_get_stdout_flags();
175:
1.6 jmcneill 176: if (of_getprop_uint32(phandle, "reg-shift", ®_shift)) {
1.7 jmcneill 177: /* missing or bad reg-shift property, assume 2 */
178: reg_shift = 2;
1.6 jmcneill 179: }
180:
181: memset(&dummy_bsh, 0, sizeof(dummy_bsh));
182: com_init_regs_stride(®s, bst, dummy_bsh, addr, reg_shift);
183:
184: if (comcnattach1(®s, speed, uart_freq, COM_TYPE_DW_APB, flags))
1.1 jmcneill 185: panic("Cannot initialize dw-apb-uart console");
186: }
187:
188: static const struct fdt_console dw_apb_uart_console = {
189: .match = dw_apb_uart_console_match,
190: .consinit = dw_apb_uart_console_consinit,
191: };
192:
193: FDT_CONSOLE(dw_apb_uart, &dw_apb_uart_console);
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