dw_apb_uart.c revision 1.2.2.2
1 1.2.2.2 pgoyette /* $NetBSD: dw_apb_uart.c,v 1.2.2.2 2018/06/25 07:25:49 pgoyette Exp $ */ 2 1.2.2.2 pgoyette 3 1.2.2.2 pgoyette /*- 4 1.2.2.2 pgoyette * Copyright (c) 2017 Jared McNeill <jmcneill (at) invisible.ca> 5 1.2.2.2 pgoyette * All rights reserved. 6 1.2.2.2 pgoyette * 7 1.2.2.2 pgoyette * Redistribution and use in source and binary forms, with or without 8 1.2.2.2 pgoyette * modification, are permitted provided that the following conditions 9 1.2.2.2 pgoyette * are met: 10 1.2.2.2 pgoyette * 1. Redistributions of source code must retain the above copyright 11 1.2.2.2 pgoyette * notice, this list of conditions and the following disclaimer. 12 1.2.2.2 pgoyette * 2. Redistributions in binary form must reproduce the above copyright 13 1.2.2.2 pgoyette * notice, this list of conditions and the following disclaimer in the 14 1.2.2.2 pgoyette * documentation and/or other materials provided with the distribution. 15 1.2.2.2 pgoyette * 16 1.2.2.2 pgoyette * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 1.2.2.2 pgoyette * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 1.2.2.2 pgoyette * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 1.2.2.2 pgoyette * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 1.2.2.2 pgoyette * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 1.2.2.2 pgoyette * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 1.2.2.2 pgoyette * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 1.2.2.2 pgoyette * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 1.2.2.2 pgoyette * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 1.2.2.2 pgoyette * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 1.2.2.2 pgoyette * POSSIBILITY OF SUCH DAMAGE. 27 1.2.2.2 pgoyette */ 28 1.2.2.2 pgoyette 29 1.2.2.2 pgoyette #include <sys/cdefs.h> 30 1.2.2.2 pgoyette 31 1.2.2.2 pgoyette __KERNEL_RCSID(1, "$NetBSD: dw_apb_uart.c,v 1.2.2.2 2018/06/25 07:25:49 pgoyette Exp $"); 32 1.2.2.2 pgoyette 33 1.2.2.2 pgoyette #include <sys/param.h> 34 1.2.2.2 pgoyette #include <sys/bus.h> 35 1.2.2.2 pgoyette #include <sys/device.h> 36 1.2.2.2 pgoyette #include <sys/intr.h> 37 1.2.2.2 pgoyette #include <sys/systm.h> 38 1.2.2.2 pgoyette #include <sys/time.h> 39 1.2.2.2 pgoyette #include <sys/termios.h> 40 1.2.2.2 pgoyette 41 1.2.2.2 pgoyette #include <dev/ic/comvar.h> 42 1.2.2.2 pgoyette 43 1.2.2.2 pgoyette #include <dev/fdt/fdtvar.h> 44 1.2.2.2 pgoyette 45 1.2.2.2 pgoyette static int dw_apb_uart_match(device_t, cfdata_t, void *); 46 1.2.2.2 pgoyette static void dw_apb_uart_attach(device_t, device_t, void *); 47 1.2.2.2 pgoyette 48 1.2.2.2 pgoyette static const char * const compatible[] = { 49 1.2.2.2 pgoyette "snps,dw-apb-uart", 50 1.2.2.2 pgoyette NULL 51 1.2.2.2 pgoyette }; 52 1.2.2.2 pgoyette 53 1.2.2.2 pgoyette struct dw_apb_uart_softc { 54 1.2.2.2 pgoyette struct com_softc ssc_sc; 55 1.2.2.2 pgoyette void *ssc_ih; 56 1.2.2.2 pgoyette 57 1.2.2.2 pgoyette struct clk *ssc_clk; 58 1.2.2.2 pgoyette struct clk *ssc_pclk; 59 1.2.2.2 pgoyette struct fdtbus_reset *ssc_rst; 60 1.2.2.2 pgoyette }; 61 1.2.2.2 pgoyette 62 1.2.2.2 pgoyette CFATTACH_DECL_NEW(dw_apb_uart, sizeof(struct dw_apb_uart_softc), 63 1.2.2.2 pgoyette dw_apb_uart_match, dw_apb_uart_attach, NULL, NULL); 64 1.2.2.2 pgoyette 65 1.2.2.2 pgoyette static int 66 1.2.2.2 pgoyette dw_apb_uart_match(device_t parent, cfdata_t cf, void *aux) 67 1.2.2.2 pgoyette { 68 1.2.2.2 pgoyette struct fdt_attach_args * const faa = aux; 69 1.2.2.2 pgoyette 70 1.2.2.2 pgoyette return of_match_compatible(faa->faa_phandle, compatible); 71 1.2.2.2 pgoyette } 72 1.2.2.2 pgoyette 73 1.2.2.2 pgoyette static void 74 1.2.2.2 pgoyette dw_apb_uart_attach(device_t parent, device_t self, void *aux) 75 1.2.2.2 pgoyette { 76 1.2.2.2 pgoyette struct dw_apb_uart_softc * const ssc = device_private(self); 77 1.2.2.2 pgoyette struct com_softc * const sc = &ssc->ssc_sc; 78 1.2.2.2 pgoyette struct fdt_attach_args * const faa = aux; 79 1.2.2.2 pgoyette bus_space_handle_t bsh; 80 1.2.2.2 pgoyette bus_space_tag_t bst; 81 1.2.2.2 pgoyette char intrstr[128]; 82 1.2.2.2 pgoyette bus_addr_t addr; 83 1.2.2.2 pgoyette bus_size_t size; 84 1.2.2.2 pgoyette u_int reg_shift; 85 1.2.2.2 pgoyette int error; 86 1.2.2.2 pgoyette 87 1.2.2.2 pgoyette if (fdtbus_get_reg(faa->faa_phandle, 0, &addr, &size) != 0) { 88 1.2.2.2 pgoyette aprint_error(": couldn't get registers\n"); 89 1.2.2.2 pgoyette return; 90 1.2.2.2 pgoyette } 91 1.2.2.2 pgoyette 92 1.2.2.2 pgoyette if (of_getprop_uint32(faa->faa_phandle, "reg-shift", ®_shift)) { 93 1.2.2.2 pgoyette /* missing or bad reg-shift property, assume 2 */ 94 1.2.2.2 pgoyette bst = faa->faa_a4x_bst; 95 1.2.2.2 pgoyette } else { 96 1.2.2.2 pgoyette if (reg_shift == 2) { 97 1.2.2.2 pgoyette bst = faa->faa_a4x_bst; 98 1.2.2.2 pgoyette } else if (reg_shift == 0) { 99 1.2.2.2 pgoyette bst = faa->faa_bst; 100 1.2.2.2 pgoyette } else { 101 1.2.2.2 pgoyette aprint_error(": unsupported reg-shift value %d\n", 102 1.2.2.2 pgoyette reg_shift); 103 1.2.2.2 pgoyette return; 104 1.2.2.2 pgoyette } 105 1.2.2.2 pgoyette } 106 1.2.2.2 pgoyette 107 1.2.2.2 pgoyette sc->sc_dev = self; 108 1.2.2.2 pgoyette 109 1.2.2.2 pgoyette ssc->ssc_clk = fdtbus_clock_get_index(faa->faa_phandle, 0); 110 1.2.2.2 pgoyette if (ssc->ssc_clk == NULL) { 111 1.2.2.2 pgoyette aprint_error(": couldn't get clock\n"); 112 1.2.2.2 pgoyette return; 113 1.2.2.2 pgoyette } 114 1.2.2.2 pgoyette if (clk_enable(ssc->ssc_clk) != 0) { 115 1.2.2.2 pgoyette aprint_error(": couldn't enable clock\n"); 116 1.2.2.2 pgoyette return; 117 1.2.2.2 pgoyette } 118 1.2.2.2 pgoyette 119 1.2.2.2 pgoyette ssc->ssc_pclk = fdtbus_clock_get(faa->faa_phandle, "apb_pclk"); 120 1.2.2.2 pgoyette if (ssc->ssc_pclk != NULL && clk_enable(ssc->ssc_pclk) != 0) { 121 1.2.2.2 pgoyette aprint_error(": couldn't enable peripheral clock\n"); 122 1.2.2.2 pgoyette return; 123 1.2.2.2 pgoyette } 124 1.2.2.2 pgoyette 125 1.2.2.2 pgoyette ssc->ssc_rst = fdtbus_reset_get_index(faa->faa_phandle, 0); 126 1.2.2.2 pgoyette if (ssc->ssc_rst && fdtbus_reset_deassert(ssc->ssc_rst) != 0) { 127 1.2.2.2 pgoyette aprint_error(": couldn't de-assert reset\n"); 128 1.2.2.2 pgoyette return; 129 1.2.2.2 pgoyette } 130 1.2.2.2 pgoyette 131 1.2.2.2 pgoyette sc->sc_frequency = clk_get_rate(ssc->ssc_clk); 132 1.2.2.2 pgoyette sc->sc_type = COM_TYPE_DW_APB; 133 1.2.2.2 pgoyette 134 1.2.2.2 pgoyette error = bus_space_map(bst, addr, size, 0, &bsh); 135 1.2.2.2 pgoyette if (error) { 136 1.2.2.2 pgoyette aprint_error(": couldn't map %#llx: %d", (uint64_t)addr, error); 137 1.2.2.2 pgoyette return; 138 1.2.2.2 pgoyette } 139 1.2.2.2 pgoyette 140 1.2.2.2 pgoyette COM_INIT_REGS(sc->sc_regs, bst, bsh, addr); 141 1.2.2.2 pgoyette 142 1.2.2.2 pgoyette com_attach_subr(sc); 143 1.2.2.2 pgoyette 144 1.2.2.2 pgoyette if (!fdtbus_intr_str(faa->faa_phandle, 0, intrstr, sizeof(intrstr))) { 145 1.2.2.2 pgoyette aprint_error_dev(self, "failed to decode interrupt\n"); 146 1.2.2.2 pgoyette return; 147 1.2.2.2 pgoyette } 148 1.2.2.2 pgoyette 149 1.2.2.2 pgoyette ssc->ssc_ih = fdtbus_intr_establish(faa->faa_phandle, 0, IPL_SERIAL, 150 1.2.2.2 pgoyette FDT_INTR_MPSAFE, comintr, sc); 151 1.2.2.2 pgoyette if (ssc->ssc_ih == NULL) { 152 1.2.2.2 pgoyette aprint_error_dev(self, "failed to establish interrupt on %s\n", 153 1.2.2.2 pgoyette intrstr); 154 1.2.2.2 pgoyette } 155 1.2.2.2 pgoyette aprint_normal_dev(self, "interrupting on %s\n", intrstr); 156 1.2.2.2 pgoyette } 157 1.2.2.2 pgoyette 158 1.2.2.2 pgoyette /* 159 1.2.2.2 pgoyette * Console support 160 1.2.2.2 pgoyette */ 161 1.2.2.2 pgoyette 162 1.2.2.2 pgoyette static int 163 1.2.2.2 pgoyette dw_apb_uart_console_match(int phandle) 164 1.2.2.2 pgoyette { 165 1.2.2.2 pgoyette return of_match_compatible(phandle, compatible); 166 1.2.2.2 pgoyette } 167 1.2.2.2 pgoyette 168 1.2.2.2 pgoyette static void 169 1.2.2.2 pgoyette dw_apb_uart_console_consinit(struct fdt_attach_args *faa, u_int uart_freq) 170 1.2.2.2 pgoyette { 171 1.2.2.2 pgoyette const int phandle = faa->faa_phandle; 172 1.2.2.2 pgoyette bus_space_tag_t bst = faa->faa_a4x_bst; 173 1.2.2.2 pgoyette bus_addr_t addr; 174 1.2.2.2 pgoyette tcflag_t flags; 175 1.2.2.2 pgoyette int speed; 176 1.2.2.2 pgoyette 177 1.2.2.2 pgoyette fdtbus_get_reg(phandle, 0, &addr, NULL); 178 1.2.2.2 pgoyette speed = fdtbus_get_stdout_speed(); 179 1.2.2.2 pgoyette if (speed < 0) 180 1.2.2.2 pgoyette speed = 115200; /* default */ 181 1.2.2.2 pgoyette flags = fdtbus_get_stdout_flags(); 182 1.2.2.2 pgoyette 183 1.2.2.2 pgoyette if (comcnattach(bst, addr, speed, uart_freq, COM_TYPE_DW_APB, flags)) 184 1.2.2.2 pgoyette panic("Cannot initialize dw-apb-uart console"); 185 1.2.2.2 pgoyette } 186 1.2.2.2 pgoyette 187 1.2.2.2 pgoyette static const struct fdt_console dw_apb_uart_console = { 188 1.2.2.2 pgoyette .match = dw_apb_uart_console_match, 189 1.2.2.2 pgoyette .consinit = dw_apb_uart_console_consinit, 190 1.2.2.2 pgoyette }; 191 1.2.2.2 pgoyette 192 1.2.2.2 pgoyette FDT_CONSOLE(dw_apb_uart, &dw_apb_uart_console); 193
Indexes created Tue Sep 30 20:09:53 GMT 2025