1 /*- 2 * Copyright (c) 2020 Oskar Holmlund <oskar.holmlund@ohdata.se> 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 18 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 20 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 21 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 * 25 * $FreeBSD$ 26 */ 27 /* 28 * Power management - simple driver to handle reset and give access to 29 * memory space region for other drivers through prcm driver. 30 * Documentation/devicetree/binding/arm/omap/prm-inst.txt 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/kernel.h> 39 #include <sys/module.h> 40 41 #include <dev/fdt/simplebus.h> 42 43 #include <dev/ofw/ofw_bus_subr.h> 44 45 #include <arm/ti/ti_prcm.h> 46 #include <arm/ti/ti_prm.h> 47 48 #if 0 49 #define DPRINTF(dev, msg...) device_printf(dev, msg) 50 #else 51 #define DPRINTF(dev, msg...) 52 #endif 53 54 /* relative to prcm address range */ 55 #define TI_PRM_PER_RSTCTRL 0xC00 56 57 struct ti_prm_softc { 58 device_t dev; 59 uint8_t type; 60 bool has_reset; 61 }; 62 63 /* Device */ 64 #define TI_OMAP_PRM_INST 10 65 66 #define TI_AM3_PRM_INST 5 67 #define TI_AM4_PRM_INST 4 68 #define TI_OMAP4_PRM_INST 3 69 #define TI_OMAP5_PRM_INST 2 70 #define TI_DRA7_PRM_INST 1 71 #define TI_END 0 72 73 static struct ofw_compat_data compat_data[] = { 74 { "ti,am3-prm-inst", TI_AM3_PRM_INST }, 75 { "ti,am4-prm-inst", TI_AM4_PRM_INST }, 76 { "ti,omap4-prm-inst", TI_OMAP4_PRM_INST }, 77 { "ti,omap5-prm-inst", TI_OMAP5_PRM_INST }, 78 { "ti,dra7-prm-inst", TI_DRA7_PRM_INST }, 79 { NULL, TI_END } 80 }; 81 82 static struct ofw_compat_data required_data[] = { 83 { "ti,omap-prm-inst", TI_OMAP_PRM_INST }, 84 { NULL, TI_END } 85 }; 86 87 /* device interface */ 88 static int 89 ti_prm_probe(device_t dev) 90 { 91 if (!ofw_bus_status_okay(dev)) 92 return (ENXIO); 93 94 if (ofw_bus_search_compatible(dev, required_data)->ocd_data == 0) 95 return (ENXIO); 96 97 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 98 return (ENXIO); 99 100 device_set_desc(dev, "TI OMAP Power Management"); 101 return(BUS_PROBE_DEFAULT); 102 } 103 104 static int 105 ti_prm_attach(device_t dev) 106 { 107 struct ti_prm_softc *sc; 108 phandle_t node; 109 110 sc = device_get_softc(dev); 111 sc->dev = dev; 112 sc->type = ofw_bus_search_compatible(dev, compat_data)->ocd_data; 113 114 node = ofw_bus_get_node(sc->dev); 115 116 if (OF_hasprop(node, "#reset-cells")) { 117 sc->has_reset = true; 118 } else 119 sc->has_reset = false; 120 121 /* Make device visible for other drivers */ 122 OF_device_register_xref(OF_xref_from_node(node), sc->dev); 123 124 return (0); 125 } 126 127 static int 128 ti_prm_detach(device_t dev) { 129 return (EBUSY); 130 } 131 132 int 133 ti_prm_reset(device_t dev) 134 { 135 struct ti_prm_softc *sc; 136 int err; 137 138 sc = device_get_softc(dev); 139 if (sc->has_reset == false) 140 return 1; 141 142 err = ti_prm_modify_4(dev, TI_PRM_PER_RSTCTRL, 0x2, 0x00); 143 return (err); 144 } 145 146 int 147 ti_prm_write_4(device_t dev, bus_addr_t addr, uint32_t val) 148 { 149 struct ti_prm_softc *sc; 150 device_t parent; 151 152 parent = device_get_parent(dev); 153 sc = device_get_softc(dev); 154 DPRINTF(sc->dev, "offset=%lx write %x\n", addr, val); 155 ti_prcm_device_lock(parent); 156 ti_prcm_write_4(parent, addr, val); 157 ti_prcm_device_unlock(parent); 158 return (0); 159 } 160 161 int 162 ti_prm_read_4(device_t dev, bus_addr_t addr, uint32_t *val) 163 { 164 struct ti_prm_softc *sc; 165 device_t parent; 166 167 parent = device_get_parent(dev); 168 sc = device_get_softc(dev); 169 170 ti_prcm_device_lock(parent); 171 ti_prcm_read_4(parent, addr, val); 172 ti_prcm_device_unlock(parent); 173 DPRINTF(sc->dev, "offset=%lx Read %x\n", addr, *val); 174 return (0); 175 } 176 177 int 178 ti_prm_modify_4(device_t dev, bus_addr_t addr, uint32_t clr, uint32_t set) 179 { 180 struct ti_prm_softc *sc; 181 device_t parent; 182 183 parent = device_get_parent(dev); 184 sc = device_get_softc(dev); 185 186 ti_prcm_device_lock(parent); 187 ti_prcm_modify_4(parent, addr, clr, set); 188 ti_prcm_device_unlock(parent); 189 DPRINTF(sc->dev, "offset=%lx (clr %x set %x)\n", addr, clr, set); 190 191 return (0); 192 } 193 194 static device_method_t ti_prm_methods[] = { 195 DEVMETHOD(device_probe, ti_prm_probe), 196 DEVMETHOD(device_attach, ti_prm_attach), 197 DEVMETHOD(device_detach, ti_prm_detach), 198 199 DEVMETHOD_END 200 }; 201 202 DEFINE_CLASS_1(ti_prm, ti_prm_driver, ti_prm_methods, 203 sizeof(struct ti_prm_softc), simplebus_driver); 204 205 static devclass_t ti_prm_devclass; 206 207 EARLY_DRIVER_MODULE(ti_prm, simplebus, ti_prm_driver, 208 ti_prm_devclass, 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE); 209 MODULE_VERSION(ti_prm, 1); 210 MODULE_DEPEND(ti_prm, ti_sysc, 1, 1, 1); 211