a10_sramc.c revision 266274
1/*- 2 * Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@gmail.com> 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: stable/10/sys/arm/allwinner/a10_sramc.c 266274 2014-05-16 23:27:18Z ian $ 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: stable/10/sys/arm/allwinner/a10_sramc.c 266274 2014-05-16 23:27:18Z ian $"); 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 57struct a10_sramc_softc { 58 struct resource *res; 59 bus_space_tag_t bst; 60 bus_space_handle_t bsh; 61}; 62 63static 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 71static int 72a10_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 83static int 84a10_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 103static 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 109static driver_t a10_sramc_driver = { 110 "a10_sramc", 111 a10_sramc_methods, 112 sizeof(struct a10_sramc_softc), 113}; 114 115static devclass_t a10_sramc_devclass; 116 117DRIVER_MODULE(a10_sramc, simplebus, a10_sramc_driver, a10_sramc_devclass, 0, 0); 118 119int 120a10_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