imx6_spi.c revision 1.2.2.2
1 1.2.2.2 thorpej /* $NetBSD: imx6_spi.c,v 1.2.2.2 2021/01/03 16:34:52 thorpej Exp $ */ 2 1.2.2.2 thorpej 3 1.2.2.2 thorpej /*- 4 1.2.2.2 thorpej * Copyright (c) 2019 Genetec Corporation. All rights reserved. 5 1.2.2.2 thorpej * Written by Hashimoto Kenichi for Genetec Corporation. 6 1.2.2.2 thorpej * 7 1.2.2.2 thorpej * Redistribution and use in source and binary forms, with or without 8 1.2.2.2 thorpej * modification, are permitted provided that the following conditions 9 1.2.2.2 thorpej * are met: 10 1.2.2.2 thorpej * 1. Redistributions of source code must retain the above copyright 11 1.2.2.2 thorpej * notice, this list of conditions and the following disclaimer. 12 1.2.2.2 thorpej * 2. Redistributions in binary form must reproduce the above copyright 13 1.2.2.2 thorpej * notice, this list of conditions and the following disclaimer in the 14 1.2.2.2 thorpej * documentation and/or other materials provided with the distribution. 15 1.2.2.2 thorpej * 16 1.2.2.2 thorpej * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 1.2.2.2 thorpej * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 1.2.2.2 thorpej * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 1.2.2.2 thorpej * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 1.2.2.2 thorpej * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 1.2.2.2 thorpej * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 1.2.2.2 thorpej * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 1.2.2.2 thorpej * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 1.2.2.2 thorpej * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 1.2.2.2 thorpej * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 1.2.2.2 thorpej * SUCH DAMAGE. 27 1.2.2.2 thorpej */ 28 1.2.2.2 thorpej 29 1.2.2.2 thorpej #include <sys/cdefs.h> 30 1.2.2.2 thorpej __KERNEL_RCSID(0, "$NetBSD: imx6_spi.c,v 1.2.2.2 2021/01/03 16:34:52 thorpej Exp $"); 31 1.2.2.2 thorpej 32 1.2.2.2 thorpej #include "opt_imxspi.h" 33 1.2.2.2 thorpej 34 1.2.2.2 thorpej #include <sys/param.h> 35 1.2.2.2 thorpej #include <sys/bus.h> 36 1.2.2.2 thorpej #include <sys/device.h> 37 1.2.2.2 thorpej #include <sys/kmem.h> 38 1.2.2.2 thorpej #include <sys/gpio.h> 39 1.2.2.2 thorpej 40 1.2.2.2 thorpej #include <arm/imx/imxspivar.h> 41 1.2.2.2 thorpej 42 1.2.2.2 thorpej #include <dev/fdt/fdtvar.h> 43 1.2.2.2 thorpej 44 1.2.2.2 thorpej struct imxspi_fdt_softc { 45 1.2.2.2 thorpej struct imxspi_softc sc_imxspi; /* Must be first */ 46 1.2.2.2 thorpej 47 1.2.2.2 thorpej struct spi_chipset_tag sc_tag; 48 1.2.2.2 thorpej struct clk *sc_clk; 49 1.2.2.2 thorpej 50 1.2.2.2 thorpej struct fdtbus_gpio_pin **sc_pin_cs; 51 1.2.2.2 thorpej }; 52 1.2.2.2 thorpej 53 1.2.2.2 thorpej struct imx_spi_config { 54 1.2.2.2 thorpej bool enhanced; 55 1.2.2.2 thorpej enum imxspi_type type; 56 1.2.2.2 thorpej }; 57 1.2.2.2 thorpej 58 1.2.2.2 thorpej static const struct imx_spi_config imx6q_spi_config = { 59 1.2.2.2 thorpej .enhanced = true, 60 1.2.2.2 thorpej .type = IMX51_ECSPI, 61 1.2.2.2 thorpej }; 62 1.2.2.2 thorpej 63 1.2.2.2 thorpej static const struct of_compat_data compat_data[] = { 64 1.2.2.2 thorpej { "fsl,imx6q-ecspi", (uintptr_t)&imx6q_spi_config }, 65 1.2.2.2 thorpej { NULL } 66 1.2.2.2 thorpej }; 67 1.2.2.2 thorpej 68 1.2.2.2 thorpej CFATTACH_DECL_NEW(imxspi_fdt, sizeof(struct imxspi_fdt_softc), 69 1.2.2.2 thorpej imxspi_match, imxspi_attach, NULL, NULL); 70 1.2.2.2 thorpej 71 1.2.2.2 thorpej static int 72 1.2.2.2 thorpej imxspi_cs_enable(void *arg, int slave) 73 1.2.2.2 thorpej { 74 1.2.2.2 thorpej struct imxspi_fdt_softc * const sc = arg; 75 1.2.2.2 thorpej fdtbus_gpio_write(sc->sc_pin_cs[slave], 1); 76 1.2.2.2 thorpej return 0; 77 1.2.2.2 thorpej } 78 1.2.2.2 thorpej 79 1.2.2.2 thorpej static int 80 1.2.2.2 thorpej imxspi_cs_disable(void *arg, int slave) 81 1.2.2.2 thorpej { 82 1.2.2.2 thorpej struct imxspi_fdt_softc * const sc = arg; 83 1.2.2.2 thorpej fdtbus_gpio_write(sc->sc_pin_cs[slave], 0); 84 1.2.2.2 thorpej return 0; 85 1.2.2.2 thorpej } 86 1.2.2.2 thorpej 87 1.2.2.2 thorpej int 88 1.2.2.2 thorpej imxspi_match(device_t parent, cfdata_t cf, void *aux) 89 1.2.2.2 thorpej { 90 1.2.2.2 thorpej struct fdt_attach_args * const faa = aux; 91 1.2.2.2 thorpej 92 1.2.2.2 thorpej return of_match_compat_data(faa->faa_phandle, compat_data); 93 1.2.2.2 thorpej } 94 1.2.2.2 thorpej 95 1.2.2.2 thorpej void 96 1.2.2.2 thorpej imxspi_attach(device_t parent, device_t self, void *aux) 97 1.2.2.2 thorpej { 98 1.2.2.2 thorpej struct imxspi_fdt_softc * const ifsc = device_private(self); 99 1.2.2.2 thorpej struct imxspi_softc * const sc = &ifsc->sc_imxspi; 100 1.2.2.2 thorpej struct fdt_attach_args * const faa = aux; 101 1.2.2.2 thorpej char intrstr[128]; 102 1.2.2.2 thorpej const int phandle = faa->faa_phandle; 103 1.2.2.2 thorpej bus_addr_t addr; 104 1.2.2.2 thorpej bus_size_t size; 105 1.2.2.2 thorpej int error; 106 1.2.2.2 thorpej 107 1.2.2.2 thorpej aprint_naive("\n"); 108 1.2.2.2 thorpej aprint_normal(": SPI\n"); 109 1.2.2.2 thorpej 110 1.2.2.2 thorpej u_int nslaves; 111 1.2.2.2 thorpej error = of_getprop_uint32(phandle, "fsl,spi-num-chipselects", &nslaves); 112 1.2.2.2 thorpej if (error) 113 1.2.2.2 thorpej nslaves = 4; 114 1.2.2.2 thorpej 115 1.2.2.2 thorpej ifsc->sc_pin_cs = kmem_alloc(sizeof(struct fdtbus_gpio_pin *) * nslaves, KM_SLEEP); 116 1.2.2.2 thorpej 117 1.2.2.2 thorpej for (int i = 0; i < nslaves; i++) { 118 1.2.2.2 thorpej ifsc->sc_pin_cs[i] = fdtbus_gpio_acquire_index(phandle, "cs-gpios", i, 119 1.2.2.2 thorpej GPIO_PIN_OUTPUT); 120 1.2.2.2 thorpej } 121 1.2.2.2 thorpej 122 1.2.2.2 thorpej ifsc->sc_clk = fdtbus_clock_get_index(phandle, 0); 123 1.2.2.2 thorpej if (ifsc->sc_clk == NULL) { 124 1.2.2.2 thorpej aprint_error(": couldn't get clock\n"); 125 1.2.2.2 thorpej return; 126 1.2.2.2 thorpej } 127 1.2.2.2 thorpej 128 1.2.2.2 thorpej error = clk_enable(ifsc->sc_clk); 129 1.2.2.2 thorpej if (error) { 130 1.2.2.2 thorpej aprint_error_dev(sc->sc_dev, "couldn't enable: %d\n", error); 131 1.2.2.2 thorpej return; 132 1.2.2.2 thorpej } 133 1.2.2.2 thorpej 134 1.2.2.2 thorpej ifsc->sc_tag.cookie = ifsc; 135 1.2.2.2 thorpej ifsc->sc_tag.spi_cs_enable = imxspi_cs_enable; 136 1.2.2.2 thorpej ifsc->sc_tag.spi_cs_disable = imxspi_cs_disable; 137 1.2.2.2 thorpej 138 1.2.2.2 thorpej sc->sc_phandle = phandle; 139 1.2.2.2 thorpej sc->sc_iot = faa->faa_bst; 140 1.2.2.2 thorpej 141 1.2.2.2 thorpej struct imx_spi_config *config = (void *)of_search_compatible(phandle, compat_data)->data; 142 1.2.2.2 thorpej sc->sc_enhanced = config->enhanced; 143 1.2.2.2 thorpej sc->sc_type = config->type; 144 1.2.2.2 thorpej 145 1.2.2.2 thorpej sc->sc_nslaves = nslaves; 146 1.2.2.2 thorpej sc->sc_freq = clk_get_rate(ifsc->sc_clk); 147 1.2.2.2 thorpej sc->sc_tag = &ifsc->sc_tag; 148 1.2.2.2 thorpej 149 1.2.2.2 thorpej if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) { 150 1.2.2.2 thorpej aprint_error(": couldn't get iomux registers\n"); 151 1.2.2.2 thorpej return; 152 1.2.2.2 thorpej } 153 1.2.2.2 thorpej 154 1.2.2.2 thorpej if (bus_space_map(sc->sc_iot, addr, size, 0, &sc->sc_ioh)) { 155 1.2.2.2 thorpej aprint_error_dev(sc->sc_dev, "couldn't map registers\n"); 156 1.2.2.2 thorpej return; 157 1.2.2.2 thorpej } 158 1.2.2.2 thorpej 159 1.2.2.2 thorpej if (!fdtbus_intr_str(faa->faa_phandle, 0, intrstr, sizeof(intrstr))) { 160 1.2.2.2 thorpej aprint_error_dev(self, "failed to decode interrupt\n"); 161 1.2.2.2 thorpej return; 162 1.2.2.2 thorpej } 163 1.2.2.2 thorpej 164 1.2.2.2 thorpej sc->sc_ih = fdtbus_intr_establish(phandle, 0, IPL_VM, 165 1.2.2.2 thorpej 0, imxspi_intr, &ifsc->sc_imxspi); 166 1.2.2.2 thorpej if (sc->sc_ih == NULL) { 167 1.2.2.2 thorpej aprint_error_dev(self, "couldn't establish interrupt on %s\n", 168 1.2.2.2 thorpej intrstr); 169 1.2.2.2 thorpej return; 170 1.2.2.2 thorpej } 171 1.2.2.2 thorpej aprint_normal_dev(self, "interrupting on %s\n", intrstr); 172 1.2.2.2 thorpej 173 1.2.2.2 thorpej imxspi_attach_common(self); 174 1.2.2.2 thorpej } 175
Indexes created Sun Oct 05 05:09:57 GMT 2025