imx6_spi.c revision 1.1
1 /* $NetBSD: imx6_spi.c,v 1.1 2020/12/23 14:42:38 skrll 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: imx6_spi.c,v 1.1 2020/12/23 14:42:38 skrll Exp $"); 31 32 #include "opt_imxspi.h" 33 34 #include <sys/param.h> 35 #include <sys/bus.h> 36 #include <sys/device.h> 37 #include <sys/kmem.h> 38 #include <sys/gpio.h> 39 40 #include <arm/imx/imxspivar.h> 41 42 #include <dev/fdt/fdtvar.h> 43 44 struct imxspi_fdt_softc { 45 struct imxspi_softc sc_imxspi; /* Must be first */ 46 47 struct spi_chipset_tag sc_tag; 48 struct clk *sc_clk; 49 50 struct fdtbus_gpio_pin **sc_pin_cs; 51 }; 52 53 struct imx_spi_config { 54 bool enhanced; 55 enum imxspi_type type; 56 }; 57 58 static const struct imx_spi_config imx6q_spi_config = { 59 .enhanced = true, 60 .type = IMX51_ECSPI, 61 }; 62 63 static const struct of_compat_data compat_data[] = { 64 { "fsl,imx6q-ecspi", (uintptr_t)&imx6q_spi_config }, 65 { NULL } 66 }; 67 68 CFATTACH_DECL_NEW(imxspi_fdt, sizeof(struct imxspi_fdt_softc), 69 imxspi_match, imxspi_attach, NULL, NULL); 70 71 static int 72 imxspi_cs_enable(void *arg, int slave) 73 { 74 struct imxspi_fdt_softc * const sc = arg; 75 fdtbus_gpio_write(sc->sc_pin_cs[slave], 1); 76 return 0; 77 } 78 79 static int 80 imxspi_cs_disable(void *arg, int slave) 81 { 82 struct imxspi_fdt_softc * const sc = arg; 83 fdtbus_gpio_write(sc->sc_pin_cs[slave], 0); 84 return 0; 85 } 86 87 int 88 imxspi_match(device_t parent, cfdata_t cf, void *aux) 89 { 90 struct fdt_attach_args * const faa = aux; 91 92 return of_match_compat_data(faa->faa_phandle, compat_data); 93 } 94 95 void 96 imxspi_attach(device_t parent, device_t self, void *aux) 97 { 98 struct imxspi_fdt_softc * const ifsc = device_private(self); 99 struct imxspi_softc * const sc = &ifsc->sc_imxspi; 100 struct fdt_attach_args * const faa = aux; 101 char intrstr[128]; 102 const int phandle = faa->faa_phandle; 103 bus_addr_t addr; 104 bus_size_t size; 105 int error; 106 107 u_int nslaves; 108 error = of_getprop_uint32(phandle, "fsl,spi-num-chipselects", &nslaves); 109 if (error) 110 nslaves = 4; 111 112 ifsc->sc_pin_cs = kmem_alloc(sizeof(struct fdtbus_gpio_pin *) * nslaves, KM_SLEEP); 113 114 for (int i = 0; i < nslaves; i++) { 115 ifsc->sc_pin_cs[i] = fdtbus_gpio_acquire_index(phandle, "cs-gpios", i, 116 GPIO_PIN_OUTPUT); 117 } 118 119 ifsc->sc_clk = fdtbus_clock_get_index(phandle, 0); 120 if (ifsc->sc_clk == NULL) { 121 aprint_error(": couldn't get clock\n"); 122 return; 123 } 124 125 error = clk_enable(ifsc->sc_clk); 126 if (error) { 127 aprint_error_dev(sc->sc_dev, "couldn't enable: %d\n", error); 128 return; 129 } 130 131 ifsc->sc_tag.cookie = ifsc; 132 ifsc->sc_tag.spi_cs_enable = imxspi_cs_enable; 133 ifsc->sc_tag.spi_cs_disable = imxspi_cs_disable; 134 135 sc->sc_phandle = phandle; 136 sc->sc_iot = faa->faa_bst; 137 138 struct imx_spi_config *config = (void *)of_search_compatible(phandle, compat_data)->data; 139 sc->sc_enhanced = config->enhanced; 140 sc->sc_type = config->type; 141 142 sc->sc_nslaves = nslaves; 143 sc->sc_freq = clk_get_rate(ifsc->sc_clk); 144 sc->sc_tag = &ifsc->sc_tag; 145 146 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) { 147 aprint_error(": couldn't get iomux registers\n"); 148 return; 149 } 150 151 if (bus_space_map(sc->sc_iot, addr, size, 0, &sc->sc_ioh)) { 152 aprint_error_dev(sc->sc_dev, "couldn't map registers\n"); 153 return; 154 } 155 156 if (!fdtbus_intr_str(faa->faa_phandle, 0, intrstr, sizeof(intrstr))) { 157 aprint_error_dev(self, "failed to decode interrupt\n"); 158 return; 159 } 160 161 sc->sc_ih = fdtbus_intr_establish(phandle, 0, IPL_VM, 162 0, imxspi_intr, &ifsc->sc_imxspi); 163 if (sc->sc_ih == NULL) { 164 aprint_error_dev(self, "couldn't establish interrupt on %s\n", 165 intrstr); 166 return; 167 } 168 aprint_normal_dev(self, "interrupting on %s\n", intrstr); 169 170 imxspi_attach_common(self); 171 } 172
Indexes created Sun Oct 05 05:09:57 GMT 2025