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ti_com.c revision 1.3 
      1 /* $NetBSD: ti_com.c,v 1.3 2017/10/26 23:28:15 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2017 Jared McNeill <jmcneill (at) 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 
     31 __KERNEL_RCSID(1, "$NetBSD: ti_com.c,v 1.3 2017/10/26 23:28:15 jmcneill Exp $");
     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 #include <arch/arm/ti/ti_prcm.h>
     46 
     47 static int ti_com_match(device_t, cfdata_t, void *);
     48 static void ti_com_attach(device_t, device_t, void *);
     49 
     50 static const char * const compatible[] = {
     51 	"ti,am3352-uart",
     52 	"ti,omap3-uart",
     53 	NULL
     54 };
     55 
     56 struct ti_com_softc {
     57 	struct com_softc ssc_sc;
     58 	void *ssc_ih;
     59 };
     60 
     61 CFATTACH_DECL_NEW(ti_com, sizeof(struct ti_com_softc),
     62 	ti_com_match, ti_com_attach, NULL, NULL);
     63 
     64 static int
     65 ti_com_match(device_t parent, cfdata_t cf, void *aux)
     66 {
     67 	struct fdt_attach_args * const faa = aux;
     68 
     69 	return of_match_compatible(faa->faa_phandle, compatible);
     70 }
     71 
     72 static void
     73 ti_com_attach(device_t parent, device_t self, void *aux)
     74 {
     75 	struct ti_com_softc * const ssc = device_private(self);
     76 	struct com_softc * const sc = &ssc->ssc_sc;
     77 	struct fdt_attach_args * const faa = aux;
     78 	const int phandle = faa->faa_phandle;
     79 	bus_space_handle_t bsh;
     80 	bus_space_tag_t bst;
     81 	char intrstr[128];
     82 	struct clk *hwmod;
     83 	bus_addr_t addr;
     84 	bus_size_t size;
     85 	int error;
     86 
     87 	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
     88 		aprint_error(": couldn't get registers\n");
     89 		return;
     90 	}
     91 
     92 	bst = faa->faa_a4x_bst;
     93 
     94 	sc->sc_dev = self;
     95 
     96 	if (of_getprop_uint32(phandle, "clock-frequency", &sc->sc_frequency) != 0) {
     97 		aprint_error(": missing 'clock-frequency' property\n");
     98 		return;
     99 	}
    100 
    101 	sc->sc_type = COM_TYPE_NORMAL;
    102 
    103 	error = bus_space_map(bst, addr, size, 0, &bsh);
    104 	if (error) {
    105 		aprint_error(": couldn't map %#llx: %d", (uint64_t)addr, error);
    106 		return;
    107 	}
    108 
    109 	hwmod = ti_prcm_get_hwmod(phandle, 0);
    110 	KASSERT(hwmod != NULL);
    111 	if (clk_enable(hwmod) != 0) {
    112 		aprint_error(": couldn't enable module\n");
    113 		return;
    114 	}
    115 
    116 	COM_INIT_REGS(sc->sc_regs, bst, bsh, addr);
    117 
    118 	com_attach_subr(sc);
    119 	aprint_naive("\n");
    120 
    121 	if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
    122 		aprint_error_dev(self, "failed to decode interrupt\n");
    123 		return;
    124 	}
    125 
    126 	ssc->ssc_ih = fdtbus_intr_establish(phandle, 0, IPL_SERIAL,
    127 	    FDT_INTR_MPSAFE, comintr, sc);
    128 	if (ssc->ssc_ih == NULL) {
    129 		aprint_error_dev(self, "failed to establish interrupt on %s\n",
    130 		    intrstr);
    131 	}
    132 	aprint_normal_dev(self, "interrupting on %s\n", intrstr);
    133 }
    134 
    135 /*
    136  * Console support
    137  */
    138 
    139 static int
    140 ti_com_console_match(int phandle)
    141 {
    142 	return of_match_compatible(phandle, compatible);
    143 }
    144 
    145 static void
    146 ti_com_console_consinit(struct fdt_attach_args *faa, u_int uart_freq)
    147 {
    148 	const int phandle = faa->faa_phandle;
    149 	bus_space_tag_t bst = faa->faa_a4x_bst;
    150 	bus_addr_t addr;
    151 	tcflag_t flags;
    152 	int speed;
    153 
    154 	fdtbus_get_reg(phandle, 0, &addr, NULL);
    155 	speed = fdtbus_get_stdout_speed();
    156 	if (speed < 0)
    157 		speed = 115200;	/* default */
    158 	flags = fdtbus_get_stdout_flags();
    159 
    160 	if (comcnattach(bst, addr, speed, uart_freq, COM_TYPE_NORMAL, flags))
    161 		panic("Cannot initialize ti com console");
    162 }
    163 
    164 static const struct fdt_console ti_com_console = {
    165 	.match = ti_com_console_match,
    166 	.consinit = ti_com_console_consinit,
    167 };
    168 
    169 FDT_CONSOLE(ti_com, &ti_com_console);
    170