tegra_sdhc.c revision 1.6
1 /* $NetBSD: tegra_sdhc.c,v 1.6 2015/05/30 18:53:39 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2015 Jared D. McNeill <jmcneill (at) 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 "locators.h" 30 31 #include <sys/cdefs.h> 32 __KERNEL_RCSID(0, "$NetBSD: tegra_sdhc.c,v 1.6 2015/05/30 18:53:39 jmcneill Exp $"); 33 34 #include <sys/param.h> 35 #include <sys/bus.h> 36 #include <sys/device.h> 37 #include <sys/intr.h> 38 #include <sys/systm.h> 39 #include <sys/kernel.h> 40 41 #include <dev/sdmmc/sdhcreg.h> 42 #include <dev/sdmmc/sdhcvar.h> 43 #include <dev/sdmmc/sdmmcvar.h> 44 45 #include <arm/nvidia/tegra_var.h> 46 47 /* 8-bit eMMC is supported on SDMMC2 and SDMMC4 */ 48 #define SDMMC_8BIT_P(port) ((port) == 1 || (port) == 3) 49 50 static int tegra_sdhc_match(device_t, cfdata_t, void *); 51 static void tegra_sdhc_attach(device_t, device_t, void *); 52 53 static int tegra_sdhc_card_detect(struct sdhc_softc *); 54 static int tegra_sdhc_write_protect(struct sdhc_softc *); 55 56 struct tegra_sdhc_softc { 57 struct sdhc_softc sc; 58 59 u_int sc_port; 60 61 bus_space_tag_t sc_bst; 62 bus_space_handle_t sc_bsh; 63 bus_size_t sc_bsz; 64 struct sdhc_host *sc_host; 65 void *sc_ih; 66 67 struct tegra_gpio_pin *sc_pin_cd; 68 struct tegra_gpio_pin *sc_pin_power; 69 struct tegra_gpio_pin *sc_pin_wp; 70 }; 71 72 CFATTACH_DECL_NEW(tegra_sdhc, sizeof(struct tegra_sdhc_softc), 73 tegra_sdhc_match, tegra_sdhc_attach, NULL, NULL); 74 75 static int 76 tegra_sdhc_match(device_t parent, cfdata_t cf, void *aux) 77 { 78 return 1; 79 } 80 81 static void 82 tegra_sdhc_attach(device_t parent, device_t self, void *aux) 83 { 84 struct tegra_sdhc_softc * const sc = device_private(self); 85 struct tegraio_attach_args * const tio = aux; 86 const struct tegra_locators * const loc = &tio->tio_loc; 87 prop_dictionary_t prop = device_properties(self); 88 const char *pin; 89 int error; 90 91 sc->sc.sc_dev = self; 92 sc->sc.sc_dmat = tio->tio_dmat; 93 sc->sc.sc_flags = SDHC_FLAG_32BIT_ACCESS | 94 SDHC_FLAG_NO_PWR0 | 95 SDHC_FLAG_NO_CLKBASE | 96 SDHC_FLAG_SINGLE_POWER_WRITE | 97 SDHC_FLAG_USE_DMA; 98 if (SDMMC_8BIT_P(loc->loc_port)) { 99 sc->sc.sc_flags |= SDHC_FLAG_8BIT_MODE; 100 } 101 sc->sc.sc_host = &sc->sc_host; 102 103 sc->sc_bst = tio->tio_bst; 104 bus_space_subregion(tio->tio_bst, tio->tio_bsh, 105 loc->loc_offset, loc->loc_size, &sc->sc_bsh); 106 sc->sc_bsz = loc->loc_size; 107 sc->sc_port = loc->loc_port; 108 109 if (prop_dictionary_get_cstring_nocopy(prop, "power-gpio", &pin)) { 110 sc->sc_pin_power = tegra_gpio_acquire(pin, GPIO_PIN_OUTPUT); 111 if (sc->sc_pin_power) 112 tegra_gpio_write(sc->sc_pin_power, 1); 113 } 114 115 if (prop_dictionary_get_cstring_nocopy(prop, "cd-gpio", &pin)) 116 sc->sc_pin_cd = tegra_gpio_acquire(pin, GPIO_PIN_INPUT); 117 if (prop_dictionary_get_cstring_nocopy(prop, "wp-gpio", &pin)) 118 sc->sc_pin_wp = tegra_gpio_acquire(pin, GPIO_PIN_INPUT); 119 120 if (sc->sc_pin_cd) 121 sc->sc.sc_vendor_card_detect = tegra_sdhc_card_detect; 122 if (sc->sc_pin_wp) 123 sc->sc.sc_vendor_write_protect = tegra_sdhc_write_protect; 124 125 #if notyet 126 tegra_car_periph_sdmmc_set_div(sc->sc_port, 1); 127 #else 128 const u_int div = howmany(tegra_car_pllp0_rate() / 1000, 50000); 129 tegra_car_periph_sdmmc_set_div(sc->sc_port, div); 130 #endif 131 sc->sc.sc_clkbase = tegra_car_periph_sdmmc_rate(sc->sc_port) / 1000; 132 133 aprint_naive("\n"); 134 aprint_normal(": SDMMC%d\n", loc->loc_port + 1); 135 136 if (sc->sc.sc_clkbase == 0) { 137 aprint_error_dev(self, "couldn't determine frequency\n"); 138 return; 139 } 140 141 sc->sc_ih = intr_establish(loc->loc_intr, IPL_SDMMC, IST_LEVEL, 142 sdhc_intr, &sc->sc); 143 if (sc->sc_ih == NULL) { 144 aprint_error_dev(self, "couldn't establish interrupt %d\n", 145 loc->loc_intr); 146 return; 147 } 148 aprint_normal_dev(self, "interrupting on irq %d\n", loc->loc_intr); 149 150 error = sdhc_host_found(&sc->sc, sc->sc_bst, sc->sc_bsh, sc->sc_bsz); 151 if (error) { 152 aprint_error_dev(self, "couldn't initialize host, error = %d\n", 153 error); 154 intr_disestablish(sc->sc_ih); 155 sc->sc_ih = NULL; 156 return; 157 } 158 } 159 160 static int 161 tegra_sdhc_card_detect(struct sdhc_softc *ssc) 162 { 163 struct tegra_sdhc_softc *sc = device_private(ssc->sc_dev); 164 165 KASSERT(sc->sc_pin_cd != NULL); 166 167 return !tegra_gpio_read(sc->sc_pin_cd); 168 } 169 170 static int 171 tegra_sdhc_write_protect(struct sdhc_softc *ssc) 172 { 173 struct tegra_sdhc_softc *sc = device_private(ssc->sc_dev); 174 175 KASSERT(sc->sc_pin_wp != NULL); 176 177 return tegra_gpio_read(sc->sc_pin_wp); 178 } 179
Indexes created Sun Oct 26 13:09:57 GMT 2025