145 lines
4.3 KiB
C
145 lines
4.3 KiB
C
/* $NetBSD: tegra_com.c,v 1.5 2015/12/22 22:10:36 jmcneill Exp $ */
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/*-
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* Copyright (c) 2013 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matt Thomas of 3am Software Foundry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(1, "$NetBSD: tegra_com.c,v 1.5 2015/12/22 22:10:36 jmcneill Exp $");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/device.h>
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#include <sys/intr.h>
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#include <sys/systm.h>
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#include <sys/time.h>
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#include <sys/termios.h>
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#include <arm/nvidia/tegra_reg.h>
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#include <arm/nvidia/tegra_var.h>
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#include <dev/ic/comvar.h>
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#include <dev/fdt/fdtvar.h>
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static int tegra_com_match(device_t, cfdata_t, void *);
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static void tegra_com_attach(device_t, device_t, void *);
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struct tegra_com_softc {
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struct com_softc tsc_sc;
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void *tsc_ih;
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struct clk *tsc_clk;
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struct fdtbus_reset *tsc_rst;
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};
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CFATTACH_DECL_NEW(tegra_com, sizeof(struct tegra_com_softc),
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tegra_com_match, tegra_com_attach, NULL, NULL);
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static int
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tegra_com_match(device_t parent, cfdata_t cf, void *aux)
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{
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const char * const compatible[] = { "nvidia,tegra124-uart", NULL };
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struct fdt_attach_args * const faa = aux;
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return of_match_compatible(faa->faa_phandle, compatible);
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}
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static void
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tegra_com_attach(device_t parent, device_t self, void *aux)
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{
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struct tegra_com_softc * const tsc = device_private(self);
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struct com_softc * const sc = &tsc->tsc_sc;
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struct fdt_attach_args * const faa = aux;
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bus_space_handle_t bsh;
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bus_space_tag_t bst;
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char intrstr[128];
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bus_addr_t addr;
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bus_size_t size;
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u_int reg_shift;
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int error;
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if (fdtbus_get_reg(faa->faa_phandle, 0, &addr, &size) != 0) {
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aprint_error(": couldn't get registers\n");
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return;
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}
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if (of_getprop_uint32(faa->faa_phandle, "reg-shift", ®_shift)) {
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/* missing or bad reg-shift property, assume 2 */
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bst = faa->faa_a4x_bst;
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} else {
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if (reg_shift == 2) {
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bst = faa->faa_a4x_bst;
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} else if (reg_shift == 0) {
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bst = faa->faa_bst;
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} else {
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aprint_error(": unsupported reg-shift value %d\n",
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reg_shift);
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return;
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}
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}
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sc->sc_dev = self;
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tsc->tsc_clk = fdtbus_clock_get_index(faa->faa_phandle, 0);
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tsc->tsc_rst = fdtbus_reset_get(faa->faa_phandle, "serial");
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if (tsc->tsc_clk == NULL) {
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aprint_error(": couldn't get frequency\n");
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return;
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}
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sc->sc_frequency = clk_get_rate(tsc->tsc_clk);
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sc->sc_type = COM_TYPE_TEGRA;
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error = bus_space_map(bst, addr, size, 0, &bsh);
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if (error) {
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aprint_error(": couldn't map %#llx: %d", (uint64_t)addr, error);
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return;
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}
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COM_INIT_REGS(sc->sc_regs, bst, bsh, addr);
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com_attach_subr(sc);
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aprint_naive("\n");
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if (!fdtbus_intr_str(faa->faa_phandle, 0, intrstr, sizeof(intrstr))) {
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aprint_error_dev(self, "failed to decode interrupt\n");
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return;
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}
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tsc->tsc_ih = fdtbus_intr_establish(faa->faa_phandle, 0, IPL_SERIAL,
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FDT_INTR_MPSAFE, comintr, sc);
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if (tsc->tsc_ih == NULL) {
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aprint_error_dev(self, "failed to establish interrupt on %s\n",
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intrstr);
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}
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aprint_normal_dev(self, "interrupting on %s\n", intrstr);
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}
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