1 /*- 2 * Copyright (c) 2013 Ian Lepore <ian@freebsd.org> 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 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 /* 31 * Clocks and power control driver for Freescale i.MX6 family of SoCs. 32 */ 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/module.h> 38 #include <sys/bus.h> 39 #include <sys/rman.h> 40 41 #include <dev/ofw/ofw_bus.h> 42 #include <dev/ofw/ofw_bus_subr.h> 43 44 #include <machine/bus.h> 45 46 #include <arm/freescale/imx/imx6_anatopreg.h> 47 #include <arm/freescale/imx/imx6_anatopvar.h> 48 #include <arm/freescale/imx/imx_machdep.h> 49 #include <arm/freescale/imx/imx6_ccmreg.h> 50 51 52 /* XXX temp kludge for imx51_get_clock. */ 53 #include <arm/freescale/imx/imx51_ccmvar.h> 54 #include <arm/freescale/imx/imx51_ccmreg.h> 55 56 struct ccm_softc { 57 device_t dev; 58 struct resource *mem_res; 59 }; 60 61 static struct ccm_softc *ccm_sc; 62 63 static inline uint32_t 64 RD4(struct ccm_softc *sc, bus_size_t off) 65 { 66 67 return (bus_read_4(sc->mem_res, off)); 68 } 69 70 static inline void 71 WR4(struct ccm_softc *sc, bus_size_t off, uint32_t val) 72 { 73 74 bus_write_4(sc->mem_res, off, val); 75 } 76 77 static int 78 ccm_detach(device_t dev) 79 { 80 struct ccm_softc *sc; 81 82 sc = device_get_softc(dev); 83 84 if (sc->mem_res != NULL) 85 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->mem_res); 86 87 return (0); 88 } 89 90 static int 91 ccm_attach(device_t dev) 92 { 93 struct ccm_softc *sc; 94 int err, rid; 95 96 sc = device_get_softc(dev); 97 err = 0; 98 99 /* Allocate bus_space resources. */ 100 rid = 0; 101 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 102 RF_ACTIVE); 103 if (sc->mem_res == NULL) { 104 device_printf(dev, "Cannot allocate memory resources\n"); 105 err = ENXIO; 106 goto out; 107 } 108 109 ccm_sc = sc; 110 err = 0; 111 112 out: 113 114 if (err != 0) 115 ccm_detach(dev); 116 117 return (err); 118 } 119 120 static int 121 ccm_probe(device_t dev) 122 { 123 124 if (!ofw_bus_status_okay(dev)) 125 return (ENXIO); 126 127 if (ofw_bus_is_compatible(dev, "fsl,imx6q-ccm") == 0) 128 return (ENXIO); 129 130 device_set_desc(dev, "Freescale i.MX6 Clock Control Module"); 131 132 return (BUS_PROBE_DEFAULT); 133 } 134 135 void 136 imx_ccm_usb_enable(device_t _usbdev) 137 { 138 139 /* 140 * For imx6, the USBOH3 clock gate is bits 0-1 of CCGR6, so no need for 141 * shifting and masking here, just set the low-order two bits to ALWAYS. 142 */ 143 WR4(ccm_sc, CCM_CCGR6, RD4(ccm_sc, CCM_CCGR6) | CCGR_CLK_MODE_ALWAYS); 144 } 145 146 void 147 imx_ccm_usbphy_enable(device_t _phydev) 148 { 149 /* 150 * XXX Which unit? 151 * Right now it's not clear how to figure from fdt data which phy unit 152 * we're supposed to operate on. Until this is worked out, just enable 153 * both PHYs. 154 */ 155 #if 0 156 int phy_num, regoff; 157 158 phy_num = 0; /* XXX */ 159 160 switch (phy_num) { 161 case 0: 162 regoff = 0; 163 break; 164 case 1: 165 regoff = 0x10; 166 break; 167 default: 168 device_printf(ccm_sc->dev, "Bad PHY number %u,\n", 169 phy_num); 170 return; 171 } 172 173 imx6_anatop_write_4(IMX6_ANALOG_CCM_PLL_USB1 + regoff, 174 IMX6_ANALOG_CCM_PLL_USB_ENABLE | 175 IMX6_ANALOG_CCM_PLL_USB_POWER | 176 IMX6_ANALOG_CCM_PLL_USB_EN_USB_CLKS); 177 #else 178 imx6_anatop_write_4(IMX6_ANALOG_CCM_PLL_USB1 + 0, 179 IMX6_ANALOG_CCM_PLL_USB_ENABLE | 180 IMX6_ANALOG_CCM_PLL_USB_POWER | 181 IMX6_ANALOG_CCM_PLL_USB_EN_USB_CLKS); 182 183 imx6_anatop_write_4(IMX6_ANALOG_CCM_PLL_USB1 + 0x10, 184 IMX6_ANALOG_CCM_PLL_USB_ENABLE | 185 IMX6_ANALOG_CCM_PLL_USB_POWER | 186 IMX6_ANALOG_CCM_PLL_USB_EN_USB_CLKS); 187 #endif 188 } 189 190 191 192 193 194 // XXX Fix this. This has to be here for other code to link, 195 // but it doesn't have to return anything useful for imx6 right now. 196 u_int 197 imx51_get_clock(enum imx51_clock clk) 198 { 199 switch (clk) 200 { 201 case IMX51CLK_IPG_CLK_ROOT: 202 return 66000000; 203 default: 204 printf("imx51_get_clock() on imx6 doesn't know about clock %d\n", clk); 205 break; 206 } 207 return 0; 208 } 209 210 static device_method_t ccm_methods[] = { 211 /* Device interface */ 212 DEVMETHOD(device_probe, ccm_probe), 213 DEVMETHOD(device_attach, ccm_attach), 214 DEVMETHOD(device_detach, ccm_detach), 215 216 DEVMETHOD_END 217 }; 218 219 static driver_t ccm_driver = { 220 "ccm", 221 ccm_methods, 222 sizeof(struct ccm_softc) 223 }; 224 225 static devclass_t ccm_devclass; 226 227 DRIVER_MODULE(ccm, simplebus, ccm_driver, ccm_devclass, 0, 0); 228 229