1 /*- 2 * Copyright (c) 2014 Ian Lepore 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 /* 30 * Pin mux and pad control driver for imx5 and imx6. 31 * 32 * This driver implements the fdt_pinctrl interface for configuring the gpio and 33 * peripheral pins based on fdt configuration data. 34 * 35 * When the driver attaches, it walks the entire fdt tree and automatically 36 * configures the pins for each device which has a pinctrl-0 property and whose 37 * status is "okay". In addition it implements the fdt_pinctrl_configure() 38 * method which any other driver can call at any time to reconfigure its pins. 39 * 40 * The nature of the fsl,pins property in fdt data makes this driver's job very 41 * easy. Instead of representing each pin and pad configuration using symbolic 42 * properties such as pullup-enable="true" and so on, the data simply contains 43 * the addresses of the registers that control the pins, and the raw values to 44 * store in those registers. 45 * 46 * The imx5 and imx6 SoCs also have a small number of "general purpose 47 * registers" in the iomuxc device which are used to control an assortment 48 * of completely unrelated aspects of SoC behavior. This driver provides other 49 * drivers with direct access to those registers via simple accessor functions. 50 */ 51 52 #include <sys/param.h> 53 #include <sys/systm.h> 54 #include <sys/bus.h> 55 #include <sys/kernel.h> 56 #include <sys/module.h> 57 #include <sys/malloc.h> 58 #include <sys/rman.h> 59 60 #include <machine/bus.h> 61 62 #include <dev/fdt/fdt_common.h> 63 #include <dev/fdt/fdt_pinctrl.h> 64 #include <dev/ofw/openfirm.h> 65 #include <dev/ofw/ofw_bus.h> 66 #include <dev/ofw/ofw_bus_subr.h> 67 68 #include <arm/freescale/imx/imx_iomuxvar.h> 69 #include <arm/freescale/imx/imx_machdep.h> 70 71 struct iomux_softc { 72 device_t dev; 73 struct resource *mem_res; 74 u_int last_gpreg; 75 }; 76 77 static struct iomux_softc *iomux_sc; 78 79 static struct ofw_compat_data compat_data[] = { 80 {"fsl,imx6dl-iomuxc", true}, 81 {"fsl,imx6q-iomuxc", true}, 82 {"fsl,imx6sl-iomuxc", true}, 83 {"fsl,imx6sx-iomuxc", true}, 84 {"fsl,imx53-iomuxc", true}, 85 {"fsl,imx51-iomuxc", true}, 86 {NULL, false}, 87 }; 88 89 /* 90 * Each tuple in an fsl,pins property contains these fields. 91 */ 92 struct pincfg { 93 uint32_t mux_reg; 94 uint32_t padconf_reg; 95 uint32_t input_reg; 96 uint32_t mux_val; 97 uint32_t input_val; 98 uint32_t padconf_val; 99 }; 100 101 #define PADCONF_NONE (1U << 31) /* Do not configure pad. */ 102 #define PADCONF_SION (1U << 30) /* Force SION bit in mux register. */ 103 #define PADMUX_SION (1U << 4) /* The SION bit in the mux register. */ 104 105 static inline uint32_t 106 RD4(struct iomux_softc *sc, bus_size_t off) 107 { 108 109 return (bus_read_4(sc->mem_res, off)); 110 } 111 112 static inline void 113 WR4(struct iomux_softc *sc, bus_size_t off, uint32_t val) 114 { 115 116 bus_write_4(sc->mem_res, off, val); 117 } 118 119 static void 120 iomux_configure_input(struct iomux_softc *sc, uint32_t reg, uint32_t val) 121 { 122 u_int select, mask, shift, width; 123 124 /* If register and value are zero, there is nothing to configure. */ 125 if (reg == 0 && val == 0) 126 return; 127 128 /* 129 * If the config value has 0xff in the high byte it is encoded: 130 * 31 23 15 7 0 131 * | 0xff | shift | width | select | 132 * We need to mask out the old select value and OR in the new, using a 133 * mask of the given width and shifting the values up by shift. 134 */ 135 if ((val & 0xff000000) == 0xff000000) { 136 select = val & 0x000000ff; 137 width = (val & 0x0000ff00) >> 8; 138 shift = (val & 0x00ff0000) >> 16; 139 mask = ((1u << width) - 1) << shift; 140 val = (RD4(sc, reg) & ~mask) | (select << shift); 141 } 142 WR4(sc, reg, val); 143 } 144 145 static int 146 iomux_configure_pins(device_t dev, phandle_t cfgxref) 147 { 148 struct iomux_softc *sc; 149 struct pincfg *cfgtuples, *cfg; 150 phandle_t cfgnode; 151 int i, ntuples; 152 uint32_t sion; 153 154 sc = device_get_softc(dev); 155 cfgnode = OF_node_from_xref(cfgxref); 156 ntuples = OF_getencprop_alloc(cfgnode, "fsl,pins", sizeof(*cfgtuples), 157 (void **)&cfgtuples); 158 if (ntuples < 0) 159 return (ENOENT); 160 if (ntuples == 0) 161 return (0); /* Empty property is not an error. */ 162 for (i = 0, cfg = cfgtuples; i < ntuples; i++, cfg++) { 163 sion = (cfg->padconf_val & PADCONF_SION) ? PADMUX_SION : 0; 164 WR4(sc, cfg->mux_reg, cfg->mux_val | sion); 165 iomux_configure_input(sc, cfg->input_reg, cfg->input_val); 166 if ((cfg->padconf_val & PADCONF_NONE) == 0) 167 WR4(sc, cfg->padconf_reg, cfg->padconf_val); 168 if (bootverbose) { 169 char name[32]; 170 OF_getprop(cfgnode, "name", &name, sizeof(name)); 171 printf("%16s: muxreg 0x%04x muxval 0x%02x " 172 "inpreg 0x%04x inpval 0x%02x " 173 "padreg 0x%04x padval 0x%08x\n", 174 name, cfg->mux_reg, cfg->mux_val | sion, 175 cfg->input_reg, cfg->input_val, 176 cfg->padconf_reg, cfg->padconf_val); 177 } 178 } 179 OF_prop_free(cfgtuples); 180 return (0); 181 } 182 183 static int 184 iomux_probe(device_t dev) 185 { 186 187 if (!ofw_bus_status_okay(dev)) 188 return (ENXIO); 189 190 if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data) 191 return (ENXIO); 192 193 device_set_desc(dev, "Freescale i.MX pin configuration"); 194 return (BUS_PROBE_DEFAULT); 195 } 196 197 static int 198 iomux_detach(device_t dev) 199 { 200 201 /* This device is always present. */ 202 return (EBUSY); 203 } 204 205 static int 206 iomux_attach(device_t dev) 207 { 208 struct iomux_softc * sc; 209 int rid; 210 211 sc = device_get_softc(dev); 212 sc->dev = dev; 213 214 switch (imx_soc_type()) { 215 case IMXSOC_51: 216 sc->last_gpreg = 1; 217 break; 218 case IMXSOC_53: 219 sc->last_gpreg = 2; 220 break; 221 case IMXSOC_6DL: 222 case IMXSOC_6S: 223 case IMXSOC_6SL: 224 case IMXSOC_6Q: 225 sc->last_gpreg = 13; 226 break; 227 default: 228 device_printf(dev, "Unknown SoC type\n"); 229 return (ENXIO); 230 } 231 232 rid = 0; 233 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 234 RF_ACTIVE); 235 if (sc->mem_res == NULL) { 236 device_printf(dev, "Cannot allocate memory resources\n"); 237 return (ENXIO); 238 } 239 240 iomux_sc = sc; 241 242 /* 243 * Register as a pinctrl device, and call the convenience function that 244 * walks the entire device tree invoking FDT_PINCTRL_CONFIGURE() on any 245 * pinctrl-0 property cells whose xref phandle refers to a configuration 246 * that is a child node of our node in the tree. 247 * 248 * The pinctrl bindings documentation specifically mentions that the 249 * pinctrl device itself may have a pinctrl-0 property which contains 250 * static configuration to be applied at device init time. The tree 251 * walk will automatically handle this for us when it passes through our 252 * node in the tree. 253 */ 254 fdt_pinctrl_register(dev, "fsl,pins"); 255 fdt_pinctrl_configure_tree(dev); 256 257 return (0); 258 } 259 260 uint32_t 261 imx_iomux_gpr_get(u_int regnum) 262 { 263 struct iomux_softc * sc; 264 265 sc = iomux_sc; 266 KASSERT(sc != NULL, ("%s called before attach", __FUNCTION__)); 267 KASSERT(regnum >= 0 && regnum <= sc->last_gpreg, 268 ("%s bad regnum %u, max %u", __FUNCTION__, regnum, sc->last_gpreg)); 269 270 return (RD4(iomux_sc, regnum * 4)); 271 } 272 273 void 274 imx_iomux_gpr_set(u_int regnum, uint32_t val) 275 { 276 struct iomux_softc * sc; 277 278 sc = iomux_sc; 279 KASSERT(sc != NULL, ("%s called before attach", __FUNCTION__)); 280 KASSERT(regnum >= 0 && regnum <= sc->last_gpreg, 281 ("%s bad regnum %u, max %u", __FUNCTION__, regnum, sc->last_gpreg)); 282 283 WR4(iomux_sc, regnum * 4, val); 284 } 285 286 void 287 imx_iomux_gpr_set_masked(u_int regnum, uint32_t clrbits, uint32_t setbits) 288 { 289 struct iomux_softc * sc; 290 uint32_t val; 291 292 sc = iomux_sc; 293 KASSERT(sc != NULL, ("%s called before attach", __FUNCTION__)); 294 KASSERT(regnum >= 0 && regnum <= sc->last_gpreg, 295 ("%s bad regnum %u, max %u", __FUNCTION__, regnum, sc->last_gpreg)); 296 297 val = RD4(iomux_sc, regnum * 4); 298 val = (val & ~clrbits) | setbits; 299 WR4(iomux_sc, regnum * 4, val); 300 } 301 302 static device_method_t imx_iomux_methods[] = { 303 /* Device interface */ 304 DEVMETHOD(device_probe, iomux_probe), 305 DEVMETHOD(device_attach, iomux_attach), 306 DEVMETHOD(device_detach, iomux_detach), 307 308 /* fdt_pinctrl interface */ 309 DEVMETHOD(fdt_pinctrl_configure,iomux_configure_pins), 310 311 DEVMETHOD_END 312 }; 313 314 static driver_t imx_iomux_driver = { 315 "imx_iomux", 316 imx_iomux_methods, 317 sizeof(struct iomux_softc), 318 }; 319 320 static devclass_t imx_iomux_devclass; 321 322 EARLY_DRIVER_MODULE(imx_iomux, simplebus, imx_iomux_driver, 323 imx_iomux_devclass, 0, 0, BUS_PASS_CPU + BUS_PASS_ORDER_LATE); 324 325