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