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_is_compatible(dev, "fsl,imx6q-ccm") == 0) 125 return (ENXIO); 126 127 device_set_desc(dev, "Freescale i.MX6 Clock Control Module"); 128 129 return (BUS_PROBE_DEFAULT); 130 } 131 132 void 133 imx_ccm_usb_enable(device_t _usbdev) 134 { 135 136 /* 137 * For imx6, the USBOH3 clock gate is bits 0-1 of CCGR6, so no need for 138 * shifting and masking here, just set the low-order two bits to ALWAYS. 139 */ 140 WR4(ccm_sc, CCM_CCGR6, RD4(ccm_sc, CCM_CCGR6) | CCGR_CLK_MODE_ALWAYS); 141 } 142 143 void 144 imx_ccm_usbphy_enable(device_t _phydev) 145 { 146 /* 147 * XXX Which unit? 148 * Right now it's not clear how to figure from fdt data which phy unit 149 * we're supposed to operate on. Until this is worked out, just enable 150 * both PHYs. 151 */ 152 #if 0 153 int phy_num, regoff; 154 155 phy_num = 0; /* XXX */ 156 157 switch (phy_num) { 158 case 0: 159 regoff = 0; 160 break; 161 case 1: 162 regoff = 0x10; 163 break; 164 default: 165 device_printf(ccm_sc->dev, "Bad PHY number %u,\n", 166 phy_num); 167 return; 168 } 169 170 imx6_anatop_write_4(IMX6_ANALOG_CCM_PLL_USB1 + regoff, 171 IMX6_ANALOG_CCM_PLL_USB_ENABLE | 172 IMX6_ANALOG_CCM_PLL_USB_POWER | 173 IMX6_ANALOG_CCM_PLL_USB_EN_USB_CLKS); 174 #else 175 imx6_anatop_write_4(IMX6_ANALOG_CCM_PLL_USB1 + 0, 176 IMX6_ANALOG_CCM_PLL_USB_ENABLE | 177 IMX6_ANALOG_CCM_PLL_USB_POWER | 178 IMX6_ANALOG_CCM_PLL_USB_EN_USB_CLKS); 179 180 imx6_anatop_write_4(IMX6_ANALOG_CCM_PLL_USB1 + 0x10, 181 IMX6_ANALOG_CCM_PLL_USB_ENABLE | 182 IMX6_ANALOG_CCM_PLL_USB_POWER | 183 IMX6_ANALOG_CCM_PLL_USB_EN_USB_CLKS); 184 #endif 185 } 186 187 188 189 190 191 // XXX Fix this. This has to be here for other code to link, 192 // but it doesn't have to return anything useful for imx6 right now. 193 u_int 194 imx51_get_clock(enum imx51_clock clk) 195 { 196 switch (clk) 197 { 198 case IMX51CLK_IPG_CLK_ROOT: 199 return 66000000; 200 default: 201 printf("imx51_get_clock() on imx6 doesn't know about clock %d\n", clk); 202 break; 203 } 204 return 0; 205 } 206 207 static device_method_t ccm_methods[] = { 208 /* Device interface */ 209 DEVMETHOD(device_probe, ccm_probe), 210 DEVMETHOD(device_attach, ccm_attach), 211 DEVMETHOD(device_detach, ccm_detach), 212 213 DEVMETHOD_END 214 }; 215 216 static driver_t ccm_driver = { 217 "ccm", 218 ccm_methods, 219 sizeof(struct ccm_softc) 220 }; 221 222 static devclass_t ccm_devclass; 223 224 DRIVER_MODULE(ccm, simplebus, ccm_driver, ccm_devclass, 0, 0); 225 226