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 47 #include <dev/fdt/fdt_common.h> 48 #include <dev/ofw/openfirm.h> 49 #include <dev/ofw/ofw_bus.h> 50 #include <dev/ofw/ofw_bus_subr.h> 51 52 #include "a10_sramc.h" 53 54 #define SRAM_CTL1_CFG 0x04 55 56 struct a10_sramc_softc { 57 struct resource *res; 58 bus_space_tag_t bst; 59 bus_space_handle_t bsh; 60 }; 61 62 static struct a10_sramc_softc *a10_sramc_sc; 63 64 #define sramc_read_4(sc, reg) \ 65 bus_space_read_4((sc)->bst, (sc)->bsh, (reg)) 66 #define sramc_write_4(sc, reg, val) \ 67 bus_space_write_4((sc)->bst, (sc)->bsh, (reg), (val)) 68 69 70 static int 71 a10_sramc_probe(device_t dev) 72 { 73 74 if (ofw_bus_is_compatible(dev, "allwinner,sun4i-sramc")) { 75 device_set_desc(dev, "Allwinner sramc module"); 76 return (BUS_PROBE_DEFAULT); 77 } 78 79 return (ENXIO); 80 } 81 82 static int 83 a10_sramc_attach(device_t dev) 84 { 85 struct a10_sramc_softc *sc = device_get_softc(dev); 86 int rid = 0; 87 88 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 89 if (!sc->res) { 90 device_printf(dev, "could not allocate resource\n"); 91 return (ENXIO); 92 } 93 94 sc->bst = rman_get_bustag(sc->res); 95 sc->bsh = rman_get_bushandle(sc->res); 96 97 a10_sramc_sc = sc; 98 99 return (0); 100 } 101 102 static device_method_t a10_sramc_methods[] = { 103 DEVMETHOD(device_probe, a10_sramc_probe), 104 DEVMETHOD(device_attach, a10_sramc_attach), 105 { 0, 0 } 106 }; 107 108 static driver_t a10_sramc_driver = { 109 "a10_sramc", 110 a10_sramc_methods, 111 sizeof(struct a10_sramc_softc), 112 }; 113 114 static devclass_t a10_sramc_devclass; 115 116 DRIVER_MODULE(a10_sramc, simplebus, a10_sramc_driver, a10_sramc_devclass, 0, 0); 117 118 int 119 a10_map_to_emac(void) 120 { 121 struct a10_sramc_softc *sc = a10_sramc_sc; 122 uint32_t reg_value; 123 124 if (sc == NULL) 125 return (ENXIO); 126 127 /* Map SRAM to EMAC, set bit 2 and 4. */ 128 reg_value = sramc_read_4(sc, SRAM_CTL1_CFG); 129 reg_value |= 0x5 << 2; 130 sramc_write_4(sc, SRAM_CTL1_CFG, reg_value); 131 132 return (0); 133 } 134