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tegra_com.c revision 1.6 
      1 /* $NetBSD: tegra_com.c,v 1.6 2017/05/25 23:42:44 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Matt Thomas of 3am Software Foundry.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 
     34 __KERNEL_RCSID(1, "$NetBSD: tegra_com.c,v 1.6 2017/05/25 23:42:44 jmcneill Exp $");
     35 
     36 #include <sys/param.h>
     37 #include <sys/bus.h>
     38 #include <sys/device.h>
     39 #include <sys/intr.h>
     40 #include <sys/systm.h>
     41 #include <sys/time.h>
     42 #include <sys/termios.h>
     43 
     44 #include <arm/nvidia/tegra_reg.h>
     45 #include <arm/nvidia/tegra_var.h>
     46 
     47 #include <dev/ic/comvar.h>
     48 
     49 #include <dev/fdt/fdtvar.h>
     50 
     51 static int tegra_com_match(device_t, cfdata_t, void *);
     52 static void tegra_com_attach(device_t, device_t, void *);
     53 
     54 struct tegra_com_softc {
     55 	struct com_softc tsc_sc;
     56 	void *tsc_ih;
     57 
     58 	struct clk *tsc_clk;
     59 	struct fdtbus_reset *tsc_rst;
     60 };
     61 
     62 CFATTACH_DECL_NEW(tegra_com, sizeof(struct tegra_com_softc),
     63 	tegra_com_match, tegra_com_attach, NULL, NULL);
     64 
     65 static int
     66 tegra_com_match(device_t parent, cfdata_t cf, void *aux)
     67 {
     68 	const char * const compatible[] = {
     69 		"nvidia,tegra210-uart",
     70 		"nvidia,tegra124-uart",
     71 		"nvidia,tegra20-uart",
     72 		NULL
     73 	};
     74 	struct fdt_attach_args * const faa = aux;
     75 
     76 	return of_match_compatible(faa->faa_phandle, compatible);
     77 }
     78 
     79 static void
     80 tegra_com_attach(device_t parent, device_t self, void *aux)
     81 {
     82 	struct tegra_com_softc * const tsc = device_private(self);
     83 	struct com_softc * const sc = &tsc->tsc_sc;
     84 	struct fdt_attach_args * const faa = aux;
     85 	bus_space_handle_t bsh;
     86 	bus_space_tag_t bst;
     87 	char intrstr[128];
     88 	bus_addr_t addr;
     89 	bus_size_t size;
     90 	u_int reg_shift;
     91 	int error;
     92 
     93 	if (fdtbus_get_reg(faa->faa_phandle, 0, &addr, &size) != 0) {
     94 		aprint_error(": couldn't get registers\n");
     95 		return;
     96 	}
     97 
     98 	if (of_getprop_uint32(faa->faa_phandle, "reg-shift", &reg_shift)) {
     99 		/* missing or bad reg-shift property, assume 2 */
    100 		bst = faa->faa_a4x_bst;
    101 	} else {
    102 		if (reg_shift == 2) {
    103 			bst = faa->faa_a4x_bst;
    104 		} else if (reg_shift == 0) {
    105 			bst = faa->faa_bst;
    106 		} else {
    107 			aprint_error(": unsupported reg-shift value %d\n",
    108 			    reg_shift);
    109 			return;
    110 		}
    111 	}
    112 
    113 	sc->sc_dev = self;
    114 
    115 	tsc->tsc_clk = fdtbus_clock_get_index(faa->faa_phandle, 0);
    116 	tsc->tsc_rst = fdtbus_reset_get(faa->faa_phandle, "serial");
    117 
    118 	if (tsc->tsc_clk == NULL) {
    119 		aprint_error(": couldn't get frequency\n");
    120 		return;
    121 	}
    122 
    123 	sc->sc_frequency = clk_get_rate(tsc->tsc_clk);
    124 	sc->sc_type = COM_TYPE_TEGRA;
    125 
    126 	error = bus_space_map(bst, addr, size, 0, &bsh);
    127 	if (error) {
    128 		aprint_error(": couldn't map %#llx: %d", (uint64_t)addr, error);
    129 		return;
    130 	}
    131 
    132 	COM_INIT_REGS(sc->sc_regs, bst, bsh, addr);
    133 
    134 	com_attach_subr(sc);
    135 	aprint_naive("\n");
    136 
    137 	if (!fdtbus_intr_str(faa->faa_phandle, 0, intrstr, sizeof(intrstr))) {
    138 		aprint_error_dev(self, "failed to decode interrupt\n");
    139 		return;
    140 	}
    141 
    142 	tsc->tsc_ih = fdtbus_intr_establish(faa->faa_phandle, 0, IPL_SERIAL,
    143 	    FDT_INTR_MPSAFE, comintr, sc);
    144 	if (tsc->tsc_ih == NULL) {
    145 		aprint_error_dev(self, "failed to establish interrupt on %s\n",
    146 		    intrstr);
    147 	}
    148 	aprint_normal_dev(self, "interrupting on %s\n", intrstr);
    149 }
    150