tegra_fuse.c revision 1.4.2.2
1 1.4.2.2 skrll /* $NetBSD: tegra_fuse.c,v 1.4.2.2 2015/12/27 12:09:31 skrll Exp $ */ 2 1.4.2.2 skrll 3 1.4.2.2 skrll /*- 4 1.4.2.2 skrll * Copyright (c) 2015 Jared D. McNeill <jmcneill (at) invisible.ca> 5 1.4.2.2 skrll * All rights reserved. 6 1.4.2.2 skrll * 7 1.4.2.2 skrll * Redistribution and use in source and binary forms, with or without 8 1.4.2.2 skrll * modification, are permitted provided that the following conditions 9 1.4.2.2 skrll * are met: 10 1.4.2.2 skrll * 1. Redistributions of source code must retain the above copyright 11 1.4.2.2 skrll * notice, this list of conditions and the following disclaimer. 12 1.4.2.2 skrll * 2. Redistributions in binary form must reproduce the above copyright 13 1.4.2.2 skrll * notice, this list of conditions and the following disclaimer in the 14 1.4.2.2 skrll * documentation and/or other materials provided with the distribution. 15 1.4.2.2 skrll * 16 1.4.2.2 skrll * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 1.4.2.2 skrll * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 1.4.2.2 skrll * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 1.4.2.2 skrll * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 1.4.2.2 skrll * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 1.4.2.2 skrll * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 1.4.2.2 skrll * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 1.4.2.2 skrll * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 1.4.2.2 skrll * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 1.4.2.2 skrll * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 1.4.2.2 skrll * SUCH DAMAGE. 27 1.4.2.2 skrll */ 28 1.4.2.2 skrll 29 1.4.2.2 skrll #include <sys/cdefs.h> 30 1.4.2.2 skrll __KERNEL_RCSID(0, "$NetBSD: tegra_fuse.c,v 1.4.2.2 2015/12/27 12:09:31 skrll Exp $"); 31 1.4.2.2 skrll 32 1.4.2.2 skrll #include <sys/param.h> 33 1.4.2.2 skrll #include <sys/bus.h> 34 1.4.2.2 skrll #include <sys/device.h> 35 1.4.2.2 skrll #include <sys/intr.h> 36 1.4.2.2 skrll #include <sys/systm.h> 37 1.4.2.2 skrll #include <sys/kernel.h> 38 1.4.2.2 skrll 39 1.4.2.2 skrll #include <arm/nvidia/tegra_reg.h> 40 1.4.2.2 skrll #include <arm/nvidia/tegra_var.h> 41 1.4.2.2 skrll 42 1.4.2.2 skrll #include <dev/fdt/fdtvar.h> 43 1.4.2.2 skrll 44 1.4.2.2 skrll static int tegra_fuse_match(device_t, cfdata_t, void *); 45 1.4.2.2 skrll static void tegra_fuse_attach(device_t, device_t, void *); 46 1.4.2.2 skrll 47 1.4.2.2 skrll struct tegra_fuse_softc { 48 1.4.2.2 skrll device_t sc_dev; 49 1.4.2.2 skrll bus_space_tag_t sc_bst; 50 1.4.2.2 skrll bus_space_handle_t sc_bsh; 51 1.4.2.2 skrll 52 1.4.2.2 skrll struct clk *sc_clk; 53 1.4.2.2 skrll struct fdtbus_reset *sc_rst; 54 1.4.2.2 skrll }; 55 1.4.2.2 skrll 56 1.4.2.2 skrll static struct tegra_fuse_softc *fuse_softc = NULL; 57 1.4.2.2 skrll 58 1.4.2.2 skrll CFATTACH_DECL_NEW(tegra_fuse, sizeof(struct tegra_fuse_softc), 59 1.4.2.2 skrll tegra_fuse_match, tegra_fuse_attach, NULL, NULL); 60 1.4.2.2 skrll 61 1.4.2.2 skrll static int 62 1.4.2.2 skrll tegra_fuse_match(device_t parent, cfdata_t cf, void *aux) 63 1.4.2.2 skrll { 64 1.4.2.2 skrll const char * const compatible[] = { "nvidia,tegra124-efuse", NULL }; 65 1.4.2.2 skrll struct fdt_attach_args * const faa = aux; 66 1.4.2.2 skrll 67 1.4.2.2 skrll return of_match_compatible(faa->faa_phandle, compatible); 68 1.4.2.2 skrll } 69 1.4.2.2 skrll 70 1.4.2.2 skrll static void 71 1.4.2.2 skrll tegra_fuse_attach(device_t parent, device_t self, void *aux) 72 1.4.2.2 skrll { 73 1.4.2.2 skrll struct tegra_fuse_softc * const sc = device_private(self); 74 1.4.2.2 skrll struct fdt_attach_args * const faa = aux; 75 1.4.2.2 skrll bus_addr_t addr; 76 1.4.2.2 skrll bus_size_t size; 77 1.4.2.2 skrll int error; 78 1.4.2.2 skrll 79 1.4.2.2 skrll if (fdtbus_get_reg(faa->faa_phandle, 0, &addr, &size) != 0) { 80 1.4.2.2 skrll aprint_error(": couldn't get registers\n"); 81 1.4.2.2 skrll return; 82 1.4.2.2 skrll } 83 1.4.2.2 skrll sc->sc_clk = fdtbus_clock_get(faa->faa_phandle, "fuse"); 84 1.4.2.2 skrll if (sc->sc_clk == NULL) { 85 1.4.2.2 skrll aprint_error(": couldn't get clock fuse\n"); 86 1.4.2.2 skrll return; 87 1.4.2.2 skrll } 88 1.4.2.2 skrll sc->sc_rst = fdtbus_reset_get(faa->faa_phandle, "fuse"); 89 1.4.2.2 skrll if (sc->sc_rst == NULL) { 90 1.4.2.2 skrll aprint_error(": couldn't get reset fuse\n"); 91 1.4.2.2 skrll return; 92 1.4.2.2 skrll } 93 1.4.2.2 skrll 94 1.4.2.2 skrll sc->sc_dev = self; 95 1.4.2.2 skrll sc->sc_bst = faa->faa_bst; 96 1.4.2.2 skrll error = bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh); 97 1.4.2.2 skrll if (error) { 98 1.4.2.2 skrll aprint_error(": couldn't map %#llx: %d", (uint64_t)addr, error); 99 1.4.2.2 skrll return; 100 1.4.2.2 skrll } 101 1.4.2.2 skrll 102 1.4.2.2 skrll KASSERT(fuse_softc == NULL); 103 1.4.2.2 skrll fuse_softc = sc; 104 1.4.2.2 skrll 105 1.4.2.2 skrll aprint_naive("\n"); 106 1.4.2.2 skrll aprint_normal(": FUSE\n"); 107 1.4.2.2 skrll } 108 1.4.2.2 skrll 109 1.4.2.2 skrll uint32_t 110 1.4.2.2 skrll tegra_fuse_read(u_int offset) 111 1.4.2.2 skrll { 112 1.4.2.2 skrll bus_space_tag_t bst; 113 1.4.2.2 skrll bus_space_handle_t bsh; 114 1.4.2.2 skrll 115 1.4.2.2 skrll KASSERT(fuse_softc != NULL); 116 1.4.2.2 skrll 117 1.4.2.2 skrll bst = fuse_softc->sc_bst; 118 1.4.2.2 skrll bsh = fuse_softc->sc_bsh; 119 1.4.2.2 skrll 120 1.4.2.2 skrll clk_enable(fuse_softc->sc_clk); 121 1.4.2.2 skrll const uint32_t v = bus_space_read_4(bst, bsh, 0x100 + offset); 122 1.4.2.2 skrll clk_disable(fuse_softc->sc_clk); 123 1.4.2.2 skrll 124 1.4.2.2 skrll return v; 125 1.4.2.2 skrll } 126
Indexes created Tue Oct 14 21:09:58 GMT 2025