1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2022 Ruslan Bukin <br@bsdpad.com> 5 * 6 * This work was supported by Innovate UK project 105694, "Digital Security 7 * by Design (DSbD) Technology Platform Prototype". 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/bus.h> 37 #include <sys/cpu.h> 38 #include <sys/kernel.h> 39 #include <sys/module.h> 40 41 #include <dev/fdt/simplebus.h> 42 #include <dev/fdt/fdt_common.h> 43 #include <dev/ofw/ofw_bus_subr.h> 44 45 #include "mmio_sram_if.h" 46 47 #include "scmi.h" 48 49 struct shmem_softc { 50 device_t dev; 51 device_t parent; 52 int reg; 53 }; 54 55 static int 56 shmem_probe(device_t dev) 57 { 58 59 if (!ofw_bus_is_compatible(dev, "arm,scmi-shmem")) 60 return (ENXIO); 61 62 if (!ofw_bus_status_okay(dev)) 63 return (ENXIO); 64 65 device_set_desc(dev, "ARM SCMI Shared Memory driver"); 66 67 return (BUS_PROBE_DEFAULT); 68 } 69 70 static int 71 shmem_attach(device_t dev) 72 { 73 struct shmem_softc *sc; 74 phandle_t node; 75 int reg; 76 77 sc = device_get_softc(dev); 78 sc->dev = dev; 79 sc->parent = device_get_parent(dev); 80 81 node = ofw_bus_get_node(dev); 82 if (node == -1) 83 return (ENXIO); 84 85 OF_getencprop(node, "reg", ®, sizeof(reg)); 86 87 dprintf("%s: reg %x\n", __func__, reg); 88 89 sc->reg = reg; 90 91 OF_device_register_xref(OF_xref_from_node(node), dev); 92 93 return (0); 94 } 95 96 static int 97 shmem_detach(device_t dev) 98 { 99 100 return (0); 101 } 102 103 void 104 scmi_shmem_read(device_t dev, bus_size_t offset, void *buf, bus_size_t len) 105 { 106 struct shmem_softc *sc; 107 uint8_t *addr; 108 int i; 109 110 sc = device_get_softc(dev); 111 112 addr = (uint8_t *)buf; 113 114 for (i = 0; i < len; i++) 115 addr[i] = MMIO_SRAM_READ_1(sc->parent, sc->reg + offset + i); 116 } 117 118 void 119 scmi_shmem_write(device_t dev, bus_size_t offset, const void *buf, 120 bus_size_t len) 121 { 122 struct shmem_softc *sc; 123 const uint8_t *addr; 124 int i; 125 126 sc = device_get_softc(dev); 127 128 addr = (const uint8_t *)buf; 129 130 for (i = 0; i < len; i++) 131 MMIO_SRAM_WRITE_1(sc->parent, sc->reg + offset + i, addr[i]); 132 } 133 134 static device_method_t shmem_methods[] = { 135 DEVMETHOD(device_probe, shmem_probe), 136 DEVMETHOD(device_attach, shmem_attach), 137 DEVMETHOD(device_detach, shmem_detach), 138 DEVMETHOD_END 139 }; 140 141 DEFINE_CLASS_1(shmem, shmem_driver, shmem_methods, sizeof(struct shmem_softc), 142 simplebus_driver); 143 144 EARLY_DRIVER_MODULE(shmem, mmio_sram, shmem_driver, 0, 0, 145 BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE); 146 MODULE_VERSION(scmi, 1); 147