1 /* $NetBSD: imx_sdhc.c,v 1.7 2022/02/06 15:52:20 jmcneill 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 1.7 2022/02/06 15:52:20 jmcneill 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 DEVICE_COMPAT_EOL 91 }; 92 93 static int 94 imx_sdhc_match(device_t parent, cfdata_t cf, void *aux) 95 { 96 struct fdt_attach_args * const faa = aux; 97 98 return of_compatible_match(faa->faa_phandle, compat_data); 99 } 100 101 static void 102 imx_sdhc_attach(device_t parent, device_t self, void *aux) 103 { 104 struct imx_sdhc_softc * const sc = device_private(self); 105 struct fdt_attach_args * const faa = aux; 106 const int phandle = faa->faa_phandle; 107 const struct imx6_sdhc_config *conf; 108 char intrstr[128]; 109 bus_addr_t addr; 110 bus_size_t size; 111 u_int bus_width; 112 int error; 113 114 fdtbus_clock_assign(phandle); 115 116 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) { 117 aprint_error(": couldn't get registers\n"); 118 return; 119 } 120 121 sc->sc_clk_per = fdtbus_clock_get(phandle, "per"); 122 if (sc->sc_clk_per == NULL) { 123 aprint_error(": couldn't get clock\n"); 124 return; 125 } 126 127 if (of_getprop_uint32(phandle, "bus-width", &bus_width)) 128 bus_width = 4; 129 130 sc->sc_vmmc_supply = fdtbus_regulator_acquire(phandle, "vmmc-supply"); 131 132 conf = of_compatible_lookup(phandle, compat_data)->data; 133 134 sc->sc_sdhc.sc_dev = self; 135 sc->sc_sdhc.sc_dmat = faa->faa_dmat; 136 137 sc->sc_sdhc.sc_clkbase = clk_get_rate(sc->sc_clk_per) / 1000; 138 sc->sc_sdhc.sc_flags = 139 SDHC_FLAG_USE_DMA | 140 SDHC_FLAG_NO_PWR0 | 141 SDHC_FLAG_HAVE_DVS | 142 SDHC_FLAG_32BIT_ACCESS | 143 SDHC_FLAG_USDHC; 144 sc->sc_sdhc.sc_flags |= conf->flags; 145 146 if (bus_width == 8) 147 sc->sc_sdhc.sc_flags |= SDHC_FLAG_8BIT_MODE; 148 if (of_hasprop(phandle, "no-1-8-v")) 149 sc->sc_sdhc.sc_flags |= SDHC_FLAG_NO_1_8_V; 150 151 sc->sc_sdhc.sc_host = &sc->sc_host; 152 153 sc->sc_bst = faa->faa_bst; 154 error = bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh); 155 if (error) { 156 aprint_error(": couldn't map %#" PRIxBUSADDR ": %d", addr, error); 157 return; 158 } 159 sc->sc_bsz = size; 160 161 sc->sc_pin_cd = fdtbus_gpio_acquire(phandle, 162 "cd-gpios", GPIO_PIN_INPUT); 163 if (sc->sc_pin_cd) { 164 sc->sc_sdhc.sc_vendor_card_detect = imx_sdhc_card_detect; 165 sc->sc_sdhc.sc_flags |= SDHC_FLAG_POLL_CARD_DET; 166 } 167 168 sc->sc_pin_wp = fdtbus_gpio_acquire(phandle, 169 "wp-gpios", GPIO_PIN_INPUT); 170 if (sc->sc_pin_wp) { 171 sc->sc_sdhc.sc_vendor_write_protect = imx_sdhc_write_protect; 172 } 173 174 error = clk_enable(sc->sc_clk_per); 175 if (error) { 176 aprint_error(": couldn't enable clock: %d\n", error); 177 return; 178 } 179 180 if (sc->sc_vmmc_supply != NULL) { 181 error = fdtbus_regulator_enable(sc->sc_vmmc_supply); 182 if (error) { 183 aprint_error(": couldn't enable vmmc supply: %d\n", error); 184 return; 185 } 186 } 187 188 aprint_naive("\n"); 189 aprint_normal(": SDMMC (%u kHz)\n", sc->sc_sdhc.sc_clkbase); 190 191 if (sc->sc_sdhc.sc_clkbase == 0) { 192 aprint_error_dev(self, "couldn't determine frequency\n"); 193 return; 194 } 195 196 if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) { 197 aprint_error_dev(self, "failed to decode interrupt\n"); 198 return; 199 } 200 201 sc->sc_ih = fdtbus_intr_establish_xname(phandle, 0, IPL_SDMMC, 202 FDT_INTR_MPSAFE, sdhc_intr, &sc->sc_sdhc, device_xname(self)); 203 if (sc->sc_ih == NULL) { 204 aprint_error_dev(self, "couldn't establish interrupt on %s\n", 205 intrstr); 206 return; 207 } 208 aprint_normal_dev(self, "interrupting on %s\n", intrstr); 209 210 error = sdhc_host_found(&sc->sc_sdhc, sc->sc_bst, sc->sc_bsh, sc->sc_bsz); 211 if (error) { 212 aprint_error_dev(self, "couldn't initialize host, error = %d\n", 213 error); 214 fdtbus_intr_disestablish(phandle, sc->sc_ih); 215 sc->sc_ih = NULL; 216 return; 217 } 218 } 219 220 static int 221 imx_sdhc_card_detect(struct sdhc_softc *ssc) 222 { 223 struct imx_sdhc_softc *sc = device_private(ssc->sc_dev); 224 225 KASSERT(sc->sc_pin_cd != NULL); 226 227 return fdtbus_gpio_read(sc->sc_pin_cd); 228 } 229 230 static int 231 imx_sdhc_write_protect(struct sdhc_softc *ssc) 232 { 233 struct imx_sdhc_softc *sc = device_private(ssc->sc_dev); 234 235 KASSERT(sc->sc_pin_wp != NULL); 236 237 return fdtbus_gpio_read(sc->sc_pin_wp); 238 } 239 240