Annotation of src/sys/dev/fdt/dw_apb_uart.c, Revision 1.11
1.11 ! jmcneill 1: /* $NetBSD: dw_apb_uart.c,v 1.10 2021/01/27 03:10:21 thorpej 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:
1.11 ! jmcneill 31: __KERNEL_RCSID(1, "$NetBSD: dw_apb_uart.c,v 1.10 2021/01/27 03:10:21 thorpej 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;
1.11 ! jmcneill 79: const int phandle = faa->faa_phandle;
1.6 jmcneill 80: bus_space_tag_t bst = faa->faa_bst;
1.1 jmcneill 81: bus_space_handle_t bsh;
82: char intrstr[128];
83: bus_addr_t addr;
84: bus_size_t size;
1.11 ! jmcneill 85: u_int reg_shift, reg_iowidth;
1.1 jmcneill 86: int error;
87:
1.11 ! jmcneill 88: if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
1.1 jmcneill 89: aprint_error(": couldn't get registers\n");
90: return;
91: }
92:
1.11 ! jmcneill 93: if (of_getprop_uint32(phandle, "reg-shift", ®_shift)) {
1.1 jmcneill 94: /* missing or bad reg-shift property, assume 2 */
1.6 jmcneill 95: reg_shift = 2;
1.1 jmcneill 96: }
1.11 ! jmcneill 97: if (of_getprop_uint32(phandle, "reg-io-width", ®_iowidth)) {
! 98: /* missing or bad reg-io-width propery, assume 1 */
! 99: reg_iowidth = 1;
! 100: }
1.1 jmcneill 101:
102: sc->sc_dev = self;
103:
1.11 ! jmcneill 104: ssc->ssc_clk = fdtbus_clock_get_index(phandle, 0);
1.1 jmcneill 105: if (ssc->ssc_clk == NULL) {
106: aprint_error(": couldn't get clock\n");
107: return;
108: }
109: if (clk_enable(ssc->ssc_clk) != 0) {
110: aprint_error(": couldn't enable clock\n");
111: return;
112: }
113:
1.11 ! jmcneill 114: ssc->ssc_pclk = fdtbus_clock_get(phandle, "apb_pclk");
1.2 jmcneill 115: if (ssc->ssc_pclk != NULL && clk_enable(ssc->ssc_pclk) != 0) {
116: aprint_error(": couldn't enable peripheral clock\n");
117: return;
118: }
119:
1.11 ! jmcneill 120: ssc->ssc_rst = fdtbus_reset_get_index(phandle, 0);
1.1 jmcneill 121: if (ssc->ssc_rst && fdtbus_reset_deassert(ssc->ssc_rst) != 0) {
122: aprint_error(": couldn't de-assert reset\n");
123: return;
124: }
125:
126: sc->sc_frequency = clk_get_rate(ssc->ssc_clk);
127: sc->sc_type = COM_TYPE_DW_APB;
128:
129: error = bus_space_map(bst, addr, size, 0, &bsh);
130: if (error) {
1.3 christos 131: aprint_error(": couldn't map %#" PRIx64 ": %d", (uint64_t)addr, error);
1.1 jmcneill 132: return;
133: }
134:
1.11 ! jmcneill 135: com_init_regs_stride_width(&sc->sc_regs, bst, bsh, addr, reg_shift, reg_iowidth);
1.1 jmcneill 136:
137: com_attach_subr(sc);
138:
1.11 ! jmcneill 139: if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
1.1 jmcneill 140: aprint_error_dev(self, "failed to decode interrupt\n");
141: return;
142: }
143:
1.11 ! jmcneill 144: ssc->ssc_ih = fdtbus_intr_establish_xname(phandle, 0,
1.9 ryo 145: IPL_SERIAL, FDT_INTR_MPSAFE, comintr, sc, device_xname(self));
1.1 jmcneill 146: if (ssc->ssc_ih == NULL) {
147: aprint_error_dev(self, "failed to establish interrupt on %s\n",
148: intrstr);
149: }
150: aprint_normal_dev(self, "interrupting on %s\n", intrstr);
151: }
152:
153: /*
154: * Console support
155: */
156:
157: static int
158: dw_apb_uart_console_match(int phandle)
159: {
1.10 thorpej 160: return of_compatible_match(phandle, compat_data);
1.1 jmcneill 161: }
162:
163: static void
164: dw_apb_uart_console_consinit(struct fdt_attach_args *faa, u_int uart_freq)
165: {
166: const int phandle = faa->faa_phandle;
1.6 jmcneill 167: bus_space_tag_t bst = faa->faa_bst;
168: bus_space_handle_t dummy_bsh;
169: struct com_regs regs;
1.1 jmcneill 170: bus_addr_t addr;
171: tcflag_t flags;
1.11 ! jmcneill 172: u_int reg_shift, reg_iowidth;
1.1 jmcneill 173: int speed;
174:
175: fdtbus_get_reg(phandle, 0, &addr, NULL);
176: speed = fdtbus_get_stdout_speed();
177: if (speed < 0)
178: speed = 115200; /* default */
179: flags = fdtbus_get_stdout_flags();
180:
1.6 jmcneill 181: if (of_getprop_uint32(phandle, "reg-shift", ®_shift)) {
1.7 jmcneill 182: /* missing or bad reg-shift property, assume 2 */
183: reg_shift = 2;
1.6 jmcneill 184: }
1.11 ! jmcneill 185: if (of_getprop_uint32(phandle, "reg-io-width", ®_iowidth)) {
! 186: /* missing or bad reg-io-width propery, assume 1 */
! 187: reg_iowidth = 1;
! 188: }
1.6 jmcneill 189:
190: memset(&dummy_bsh, 0, sizeof(dummy_bsh));
1.11 ! jmcneill 191: com_init_regs_stride_width(®s, bst, dummy_bsh, addr, reg_shift, reg_iowidth);
1.6 jmcneill 192:
193: if (comcnattach1(®s, speed, uart_freq, COM_TYPE_DW_APB, flags))
1.1 jmcneill 194: panic("Cannot initialize dw-apb-uart console");
195: }
196:
197: static const struct fdt_console dw_apb_uart_console = {
198: .match = dw_apb_uart_console_match,
199: .consinit = dw_apb_uart_console_consinit,
200: };
201:
202: FDT_CONSOLE(dw_apb_uart, &dw_apb_uart_console);
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