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