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 /* 26 * Power management - simple driver to handle reset and give access to 27 * memory space region for other drivers through prcm driver. 28 * Documentation/devicetree/binding/arm/omap/prm-inst.txt 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/module.h> 38 39 #include <dev/fdt/simplebus.h> 40 41 #include <dev/ofw/ofw_bus_subr.h> 42 43 #include <arm/ti/ti_prcm.h> 44 #include <arm/ti/ti_prm.h> 45 46 #if 0 47 #define DPRINTF(dev, msg...) device_printf(dev, msg) 48 #else 49 #define DPRINTF(dev, msg...) 50 #endif 51 52 /* relative to prcm address range */ 53 #define TI_PRM_PER_RSTCTRL 0xC00 54 55 struct ti_prm_softc { 56 device_t dev; 57 uint8_t type; 58 bool has_reset; 59 }; 60 61 /* Device */ 62 #define TI_OMAP_PRM_INST 10 63 64 #define TI_AM3_PRM_INST 5 65 #define TI_AM4_PRM_INST 4 66 #define TI_OMAP4_PRM_INST 3 67 #define TI_OMAP5_PRM_INST 2 68 #define TI_DRA7_PRM_INST 1 69 #define TI_END 0 70 71 static struct ofw_compat_data compat_data[] = { 72 { "ti,am3-prm-inst", TI_AM3_PRM_INST }, 73 { "ti,am4-prm-inst", TI_AM4_PRM_INST }, 74 { "ti,omap4-prm-inst", TI_OMAP4_PRM_INST }, 75 { "ti,omap5-prm-inst", TI_OMAP5_PRM_INST }, 76 { "ti,dra7-prm-inst", TI_DRA7_PRM_INST }, 77 { NULL, TI_END } 78 }; 79 80 static struct ofw_compat_data required_data[] = { 81 { "ti,omap-prm-inst", TI_OMAP_PRM_INST }, 82 { NULL, TI_END } 83 }; 84 85 /* device interface */ 86 static int 87 ti_prm_probe(device_t dev) 88 { 89 if (!ofw_bus_status_okay(dev)) 90 return (ENXIO); 91 92 if (ofw_bus_search_compatible(dev, required_data)->ocd_data == 0) 93 return (ENXIO); 94 95 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 96 return (ENXIO); 97 98 device_set_desc(dev, "TI OMAP Power Management"); 99 return(BUS_PROBE_DEFAULT); 100 } 101 102 static int 103 ti_prm_attach(device_t dev) 104 { 105 struct ti_prm_softc *sc; 106 phandle_t node; 107 108 sc = device_get_softc(dev); 109 sc->dev = dev; 110 sc->type = ofw_bus_search_compatible(dev, compat_data)->ocd_data; 111 112 node = ofw_bus_get_node(sc->dev); 113 114 if (OF_hasprop(node, "#reset-cells")) { 115 sc->has_reset = true; 116 } else 117 sc->has_reset = false; 118 119 /* Make device visible for other drivers */ 120 OF_device_register_xref(OF_xref_from_node(node), sc->dev); 121 122 return (0); 123 } 124 125 static int 126 ti_prm_detach(device_t dev) { 127 return (EBUSY); 128 } 129 130 int 131 ti_prm_reset(device_t dev) 132 { 133 struct ti_prm_softc *sc; 134 int err; 135 136 sc = device_get_softc(dev); 137 if (sc->has_reset == false) 138 return 1; 139 140 err = ti_prm_modify_4(dev, TI_PRM_PER_RSTCTRL, 0x2, 0x00); 141 return (err); 142 } 143 144 int 145 ti_prm_write_4(device_t dev, bus_addr_t addr, uint32_t val) 146 { 147 device_t parent; 148 149 parent = device_get_parent(dev); 150 DPRINTF(dev, "offset=%lx write %x\n", addr, val); 151 ti_prcm_device_lock(parent); 152 ti_prcm_write_4(parent, addr, val); 153 ti_prcm_device_unlock(parent); 154 return (0); 155 } 156 157 int 158 ti_prm_read_4(device_t dev, bus_addr_t addr, uint32_t *val) 159 { 160 device_t parent; 161 162 parent = device_get_parent(dev); 163 164 ti_prcm_device_lock(parent); 165 ti_prcm_read_4(parent, addr, val); 166 ti_prcm_device_unlock(parent); 167 DPRINTF(dev, "offset=%lx Read %x\n", addr, *val); 168 return (0); 169 } 170 171 int 172 ti_prm_modify_4(device_t dev, bus_addr_t addr, uint32_t clr, uint32_t set) 173 { 174 device_t parent; 175 176 parent = device_get_parent(dev); 177 178 ti_prcm_device_lock(parent); 179 ti_prcm_modify_4(parent, addr, clr, set); 180 ti_prcm_device_unlock(parent); 181 DPRINTF(dev, "offset=%lx (clr %x set %x)\n", addr, clr, set); 182 183 return (0); 184 } 185 186 static device_method_t ti_prm_methods[] = { 187 DEVMETHOD(device_probe, ti_prm_probe), 188 DEVMETHOD(device_attach, ti_prm_attach), 189 DEVMETHOD(device_detach, ti_prm_detach), 190 191 DEVMETHOD_END 192 }; 193 194 DEFINE_CLASS_1(ti_prm, ti_prm_driver, ti_prm_methods, 195 sizeof(struct ti_prm_softc), simplebus_driver); 196 197 EARLY_DRIVER_MODULE(ti_prm, simplebus, ti_prm_driver, 0, 0, 198 BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE); 199 MODULE_VERSION(ti_prm, 1); 200 MODULE_DEPEND(ti_prm, ti_sysc, 1, 1, 1); 201