1/* $NetBSD: dwcwdt_fdt.c,v 1.6 2023/04/16 16:51:38 jmcneill Exp $ */ 2 3/*- 4 * Copyright (c) 2018, 2023 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 AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29#include <sys/cdefs.h> 30__KERNEL_RCSID(0, "$NetBSD: dwcwdt_fdt.c,v 1.6 2023/04/16 16:51:38 jmcneill Exp $"); 31 32#include <sys/param.h> 33#include <sys/bus.h> 34#include <sys/device.h> 35#include <sys/intr.h> 36#include <sys/systm.h> 37#include <sys/mutex.h> 38#include <sys/wdog.h> 39 40#include <dev/sysmon/sysmonvar.h> 41#include <dev/ic/dwc_wdt_var.h> 42 43#include <dev/fdt/fdtvar.h> 44 45static const struct device_compatible_entry compat_data[] = { 46 { .compat = "snps,dw-wdt" }, 47 DEVICE_COMPAT_EOL 48}; 49 50static int 51dwcwdt_fdt_match(device_t parent, cfdata_t cf, void *aux) 52{ 53 struct fdt_attach_args * const faa = aux; 54 55 return of_compatible_match(faa->faa_phandle, compat_data); 56} 57 58static void 59dwcwdt_fdt_attach(device_t parent, device_t self, void *aux) 60{ 61 struct dwcwdt_softc * const sc = device_private(self); 62 struct fdt_attach_args * const faa = aux; 63 const int phandle = faa->faa_phandle; 64 struct fdtbus_reset *rst; 65 struct clk *clk; 66 bus_addr_t addr; 67 bus_size_t size; 68 69 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) { 70 aprint_error(": couldn't get registers\n"); 71 return; 72 } 73 74 clk = fdtbus_clock_get_index(phandle, 0); 75 if (clk == NULL || clk_enable(clk) != 0) { 76 aprint_error(": couldn't enable clock\n"); 77 return; 78 } 79 rst = fdtbus_reset_get_index(phandle, 0); 80 if (rst && fdtbus_reset_assert(rst) != 0) { 81 aprint_error(": couldn't assert reset\n"); 82 return; 83 } 84 if (rst && fdtbus_reset_deassert(rst) != 0) { 85 aprint_error(": couldn't de-assert reset\n"); 86 return; 87 } 88 89 sc->sc_dev = self; 90 sc->sc_bst = faa->faa_bst; 91 if (bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh) != 0) { 92 aprint_error(": couldn't map registers\n"); 93 return; 94 } 95 sc->sc_clkrate = clk_get_rate(clk); 96 97 aprint_naive("\n"); 98 aprint_normal(": DesignWare Watchdog Timer\n"); 99 100 dwcwdt_init(sc); 101} 102 103CFATTACH_DECL_NEW(dwcwdt_fdt, sizeof(struct dwcwdt_softc), 104 dwcwdt_fdt_match, dwcwdt_fdt_attach, NULL, NULL); 105