imx_sdhc.c revision 1.3
1 /* $NetBSD: imx_sdhc.c,v 1.3 2021/01/18 02:35:48 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2019 Genetec Corporation. All rights reserved. 5 * Written by Hashimoto Kenichi for Genetec Corporation. 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: imx_sdhc.c,v 1.3 2021/01/18 02:35:48 thorpej Exp $"); 31 32 #include "opt_fdt.h" 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 #include <sys/gpio.h> 41 42 #include <dev/sdmmc/sdhcreg.h> 43 #include <dev/sdmmc/sdhcvar.h> 44 #include <dev/sdmmc/sdmmcvar.h> 45 46 #include <dev/fdt/fdtvar.h> 47 48 static int imx_sdhc_match(device_t, cfdata_t, void *); 49 static void imx_sdhc_attach(device_t, device_t, void *); 50 51 static int imx_sdhc_card_detect(struct sdhc_softc *); 52 static int imx_sdhc_write_protect(struct sdhc_softc *); 53 54 struct imx_sdhc_softc { 55 struct sdhc_softc sc_sdhc; 56 57 bus_space_tag_t sc_bst; 58 bus_space_handle_t sc_bsh; 59 bus_size_t sc_bsz; 60 61 struct sdhc_host *sc_host; 62 void *sc_ih; 63 64 struct clk *sc_clk_per; 65 struct fdtbus_regulator *sc_vmmc_supply; 66 67 struct fdtbus_gpio_pin *sc_pin_cd; 68 struct fdtbus_gpio_pin *sc_pin_wp; 69 }; 70 71 CFATTACH_DECL_NEW(imx_sdhc, sizeof(struct imx_sdhc_softc), 72 imx_sdhc_match, imx_sdhc_attach, NULL, NULL); 73 74 struct imx6_sdhc_config { 75 uint32_t flags; 76 }; 77 78 static const struct imx6_sdhc_config imx6q_config = { 79 .flags = SDHC_FLAG_BROKEN_ADMA2_ZEROLEN | 80 SDHC_FLAG_NO_BUSY_INTR, 81 }; 82 83 static const struct imx6_sdhc_config imx7d_config = { 84 .flags = 0 85 }; 86 87 static const struct device_compatible_entry compat_data[] = { 88 { .compat = "fsl,imx6q-usdhc", .data = &imx6q_config }, 89 { .compat = "fsl,imx7d-usdhc", .data = &imx7d_config }, 90 91 { 0 } 92 }; 93 94 static int 95 imx_sdhc_match(device_t parent, cfdata_t cf, void *aux) 96 { 97 struct fdt_attach_args * const faa = aux; 98 99 return of_match_compat_data(faa->faa_phandle, compat_data); 100 } 101 102 static void 103 imx_sdhc_attach(device_t parent, device_t self, void *aux) 104 { 105 struct imx_sdhc_softc * const sc = device_private(self); 106 struct fdt_attach_args * const faa = aux; 107 const int phandle = faa->faa_phandle; 108 const struct imx6_sdhc_config *conf; 109 char intrstr[128]; 110 bus_addr_t addr; 111 bus_size_t size; 112 u_int bus_width; 113 int error; 114 115 fdtbus_clock_assign(phandle); 116 117 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) { 118 aprint_error(": couldn't get registers\n"); 119 return; 120 } 121 122 sc->sc_clk_per = fdtbus_clock_get(phandle, "per"); 123 if (sc->sc_clk_per == NULL) { 124 aprint_error(": couldn't get clock\n"); 125 return; 126 } 127 128 if (of_getprop_uint32(phandle, "bus-width", &bus_width)) 129 bus_width = 4; 130 131 sc->sc_vmmc_supply = fdtbus_regulator_acquire(phandle, "vmmc-supply"); 132 133 conf = of_search_compatible(phandle, compat_data)->data; 134 135 sc->sc_sdhc.sc_dev = self; 136 sc->sc_sdhc.sc_dmat = faa->faa_dmat; 137 138 sc->sc_sdhc.sc_clkbase = clk_get_rate(sc->sc_clk_per) / 1000; 139 sc->sc_sdhc.sc_flags = 140 SDHC_FLAG_USE_DMA | 141 SDHC_FLAG_NO_PWR0 | 142 SDHC_FLAG_HAVE_DVS | 143 SDHC_FLAG_32BIT_ACCESS | 144 SDHC_FLAG_USE_ADMA2 | 145 SDHC_FLAG_USDHC; 146 sc->sc_sdhc.sc_flags |= conf->flags; 147 148 if (bus_width == 8) 149 sc->sc_sdhc.sc_flags |= SDHC_FLAG_8BIT_MODE; 150 if (of_hasprop(phandle, "no-1-8-v")) 151 sc->sc_sdhc.sc_flags |= SDHC_FLAG_NO_1_8_V; 152 153 sc->sc_sdhc.sc_host = &sc->sc_host; 154 155 sc->sc_bst = faa->faa_bst; 156 error = bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh); 157 if (error) { 158 aprint_error(": couldn't map %#" PRIxBUSADDR ": %d", addr, error); 159 return; 160 } 161 sc->sc_bsz = size; 162 163 sc->sc_pin_cd = fdtbus_gpio_acquire(phandle, 164 "cd-gpios", GPIO_PIN_INPUT); 165 if (sc->sc_pin_cd) { 166 sc->sc_sdhc.sc_vendor_card_detect = imx_sdhc_card_detect; 167 sc->sc_sdhc.sc_flags |= SDHC_FLAG_POLL_CARD_DET; 168 } 169 170 sc->sc_pin_wp = fdtbus_gpio_acquire(phandle, 171 "wp-gpios", GPIO_PIN_INPUT); 172 if (sc->sc_pin_wp) { 173 sc->sc_sdhc.sc_vendor_write_protect = imx_sdhc_write_protect; 174 } 175 176 error = clk_enable(sc->sc_clk_per); 177 if (error) { 178 aprint_error(": couldn't enable clock: %d\n", error); 179 return; 180 } 181 182 if (sc->sc_vmmc_supply != NULL) { 183 error = fdtbus_regulator_enable(sc->sc_vmmc_supply); 184 if (error) { 185 aprint_error(": couldn't enable vmmc supply: %d\n", error); 186 return; 187 } 188 } 189 190 aprint_naive("\n"); 191 aprint_normal(": SDMMC (%u kHz)\n", sc->sc_sdhc.sc_clkbase); 192 193 if (sc->sc_sdhc.sc_clkbase == 0) { 194 aprint_error_dev(self, "couldn't determine frequency\n"); 195 return; 196 } 197 198 if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) { 199 aprint_error_dev(self, "failed to decode interrupt\n"); 200 return; 201 } 202 203 sc->sc_ih = fdtbus_intr_establish_xname(phandle, 0, IPL_SDMMC, 204 FDT_INTR_MPSAFE, sdhc_intr, &sc->sc_sdhc, device_xname(self)); 205 if (sc->sc_ih == NULL) { 206 aprint_error_dev(self, "couldn't establish interrupt on %s\n", 207 intrstr); 208 return; 209 } 210 aprint_normal_dev(self, "interrupting on %s\n", intrstr); 211 212 error = sdhc_host_found(&sc->sc_sdhc, sc->sc_bst, sc->sc_bsh, sc->sc_bsz); 213 if (error) { 214 aprint_error_dev(self, "couldn't initialize host, error = %d\n", 215 error); 216 fdtbus_intr_disestablish(phandle, sc->sc_ih); 217 sc->sc_ih = NULL; 218 return; 219 } 220 } 221 222 static int 223 imx_sdhc_card_detect(struct sdhc_softc *ssc) 224 { 225 struct imx_sdhc_softc *sc = device_private(ssc->sc_dev); 226 227 KASSERT(sc->sc_pin_cd != NULL); 228 229 return fdtbus_gpio_read(sc->sc_pin_cd); 230 } 231 232 static int 233 imx_sdhc_write_protect(struct sdhc_softc *ssc) 234 { 235 struct imx_sdhc_softc *sc = device_private(ssc->sc_dev); 236 237 KASSERT(sc->sc_pin_wp != NULL); 238 239 return fdtbus_gpio_read(sc->sc_pin_wp); 240 } 241 242
Indexes created Mon Sep 22 13:09:51 GMT 2025