1 /* $NetBSD: vexpress_sysreg.c,v 1.3 2017/06/30 09:19:19 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2017 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: vexpress_sysreg.c,v 1.3 2017/06/30 09:19:19 jmcneill Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/device.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 38 #include <dev/fdt/fdtvar.h> 39 40 #define SYS_CFGDATA 0x00a0 41 #define SYS_CFGCTRL 0x00a4 42 #define SYS_CFGCTRL_START __BIT(31) 43 #define SYS_CFGCTRL_WRITE __BIT(30) 44 #define SYS_CFGCTRL_FUNCTION __BITS(25,20) 45 #define SYS_CFGCTRL_FUNCTION_SHUTDOWN 8 46 #define SYS_CFGCTRL_FUNCTION_REBOOT 9 47 #define SYS_CFGCTRL_SITE __BITS(17,16) 48 #define SYS_CFGCTRL_SITE_MB 0 49 #define SYS_CFGSTAT 0x00a8 50 51 static int vexpress_sysreg_match(device_t, cfdata_t, void *); 52 static void vexpress_sysreg_attach(device_t, device_t, void *); 53 54 static const char * const compatible[] = { "arm,vexpress-sysreg", NULL }; 55 56 struct vexpress_sysreg_softc { 57 device_t sc_dev; 58 bus_space_tag_t sc_bst; 59 bus_space_handle_t sc_bsh; 60 }; 61 62 CFATTACH_DECL_NEW(vexpress_sysreg, sizeof(struct vexpress_sysreg_softc), 63 vexpress_sysreg_match, vexpress_sysreg_attach, NULL, NULL); 64 65 static void 66 vexpress_sysreg_write(device_t dev, u_int func, u_int site) 67 { 68 struct vexpress_sysreg_softc * const sc = device_private(dev); 69 70 const uint32_t cfgctrl = SYS_CFGCTRL_START | SYS_CFGCTRL_WRITE | 71 __SHIFTIN(func, SYS_CFGCTRL_FUNCTION) | 72 __SHIFTIN(site, SYS_CFGCTRL_SITE); 73 74 bus_space_write_4(sc->sc_bst, sc->sc_bsh, SYS_CFGSTAT, 0); 75 bus_space_write_4(sc->sc_bst, sc->sc_bsh, SYS_CFGDATA, 0); 76 bus_space_write_4(sc->sc_bst, sc->sc_bsh, SYS_CFGCTRL, cfgctrl); 77 } 78 79 static void 80 vexpress_sysreg_reset(device_t dev) 81 { 82 delay(1000000); 83 vexpress_sysreg_write(dev, SYS_CFGCTRL_FUNCTION_REBOOT, SYS_CFGCTRL_SITE_MB); 84 } 85 86 static void 87 vexpress_sysreg_poweroff(device_t dev) 88 { 89 delay(1000000); 90 vexpress_sysreg_write(dev, SYS_CFGCTRL_FUNCTION_SHUTDOWN, SYS_CFGCTRL_SITE_MB); 91 } 92 93 static struct fdtbus_power_controller_func vexpress_sysreg_power_funcs = { 94 .reset = vexpress_sysreg_reset, 95 .poweroff = vexpress_sysreg_poweroff, 96 }; 97 98 static int 99 vexpress_sysreg_match(device_t parent, cfdata_t cf, void *aux) 100 { 101 struct fdt_attach_args * const faa = aux; 102 103 return of_match_compatible(faa->faa_phandle, compatible); 104 } 105 106 static void 107 vexpress_sysreg_attach(device_t parent, device_t self, void *aux) 108 { 109 struct vexpress_sysreg_softc * const sc = device_private(self); 110 struct fdt_attach_args * const faa = aux; 111 const int phandle = faa->faa_phandle; 112 bus_addr_t addr; 113 bus_size_t size; 114 115 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) { 116 aprint_error(": missing 'reg' property\n"); 117 return; 118 } 119 120 sc->sc_dev = self; 121 sc->sc_bst = faa->faa_bst; 122 if (bus_space_map(faa->faa_bst, addr, size, 0, &sc->sc_bsh)) { 123 aprint_error(": couldn't map device\n"); 124 return; 125 } 126 127 aprint_naive("\n"); 128 aprint_normal("\n"); 129 130 fdtbus_register_power_controller(self, phandle, 131 &vexpress_sysreg_power_funcs); 132 } 133