1 /*- 2 * Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/bus.h> 35 #include <sys/kernel.h> 36 #include <sys/module.h> 37 #include <sys/malloc.h> 38 #include <sys/rman.h> 39 #include <sys/timeet.h> 40 #include <sys/timetc.h> 41 #include <sys/watchdog.h> 42 #include <machine/bus.h> 43 #include <machine/cpu.h> 44 #include <machine/frame.h> 45 #include <machine/intr.h> 46 #include <machine/fdt.h> 47 48 #include <dev/fdt/fdt_common.h> 49 #include <dev/ofw/openfirm.h> 50 #include <dev/ofw/ofw_bus.h> 51 #include <dev/ofw/ofw_bus_subr.h> 52 53 #include "a10_sramc.h" 54 55 #define SRAM_CTL1_CFG 0x04 56 57 struct a10_sramc_softc { 58 struct resource *res; 59 bus_space_tag_t bst; 60 bus_space_handle_t bsh; 61 }; 62 63 static struct a10_sramc_softc *a10_sramc_sc; 64 65 #define sramc_read_4(sc, reg) \ 66 bus_space_read_4((sc)->bst, (sc)->bsh, (reg)) 67 #define sramc_write_4(sc, reg, val) \ 68 bus_space_write_4((sc)->bst, (sc)->bsh, (reg), (val)) 69 70 71 static int 72 a10_sramc_probe(device_t dev) 73 { 74 75 if (ofw_bus_is_compatible(dev, "allwinner,sun4i-sramc")) { 76 device_set_desc(dev, "Allwinner sramc module"); 77 return (BUS_PROBE_DEFAULT); 78 } 79 80 return (ENXIO); 81 } 82 83 static int 84 a10_sramc_attach(device_t dev) 85 { 86 struct a10_sramc_softc *sc = device_get_softc(dev); 87 int rid = 0; 88 89 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 90 if (!sc->res) { 91 device_printf(dev, "could not allocate resource\n"); 92 return (ENXIO); 93 } 94 95 sc->bst = rman_get_bustag(sc->res); 96 sc->bsh = rman_get_bushandle(sc->res); 97 98 a10_sramc_sc = sc; 99 100 return (0); 101 } 102 103 static device_method_t a10_sramc_methods[] = { 104 DEVMETHOD(device_probe, a10_sramc_probe), 105 DEVMETHOD(device_attach, a10_sramc_attach), 106 { 0, 0 } 107 }; 108 109 static driver_t a10_sramc_driver = { 110 "a10_sramc", 111 a10_sramc_methods, 112 sizeof(struct a10_sramc_softc), 113 }; 114 115 static devclass_t a10_sramc_devclass; 116 117 DRIVER_MODULE(a10_sramc, simplebus, a10_sramc_driver, a10_sramc_devclass, 0, 0); 118 119 int 120 a10_map_to_emac(void) 121 { 122 struct a10_sramc_softc *sc = a10_sramc_sc; 123 uint32_t reg_value; 124 125 if (sc == NULL) 126 return (ENXIO); 127 128 /* Map SRAM to EMAC, set bit 2 and 4. */ 129 reg_value = sramc_read_4(sc, SRAM_CTL1_CFG); 130 reg_value |= 0x5 << 2; 131 sramc_write_4(sc, SRAM_CTL1_CFG, reg_value); 132 133 return (0); 134 } 135