1 /* $NetBSD: imx51_clock.c,v 1.4 2012/10/27 17:17:39 chs Exp $ */ 2 /* 3 * Copyright (c) 2009 Genetec corp. All rights reserved. 4 * Written by Hashimoto Kenichi for Genetec corp. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY GENETEC CORP. ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 17 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GENETEC CORP. 19 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 * POSSIBILITY OF SUCH DAMAGE. 26 */ 27 #include <sys/cdefs.h> 28 __KERNEL_RCSID(0, "$NetBSD: imx51_clock.c,v 1.4 2012/10/27 17:17:39 chs Exp $"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/kernel.h> 33 #include <sys/evcnt.h> 34 #include <sys/atomic.h> 35 #include <sys/time.h> 36 #include <sys/timetc.h> 37 38 #include <sys/types.h> 39 #include <sys/device.h> 40 41 #include <dev/clock_subr.h> 42 43 #include <machine/intr.h> 44 #include <sys/bus.h> 45 46 #include <arm/cpufunc.h> 47 48 #include <arm/imx/imx51reg.h> 49 #include <arm/imx/imx51var.h> 50 #include <arm/imx/imxepitreg.h> 51 #include <arm/imx/imx51_ccmvar.h> 52 #include <arm/imx/imxclockvar.h> 53 54 #include "imxccm.h" /* if CCM driver is configured into the kernel */ 55 #include "opt_imx51clk.h" 56 57 58 59 static int imxclock_match(device_t, struct cfdata *, void *); 60 static void imxclock_attach(device_t, device_t, void *); 61 62 struct imxclock_softc *epit1_sc = NULL; 63 struct imxclock_softc *epit2_sc = NULL; 64 65 CFATTACH_DECL_NEW(imxclock, sizeof(struct imxclock_softc), 66 imxclock_match, imxclock_attach, NULL, NULL); 67 68 static int 69 imxclock_match(device_t parent, struct cfdata *match, void *aux) 70 { 71 struct axi_attach_args *aa = aux; 72 73 if ( (aa->aa_addr != EPIT1_BASE) && 74 (aa->aa_addr != EPIT2_BASE) ) { 75 return 0; 76 } 77 78 return 2; 79 } 80 81 static void 82 imxclock_attach(device_t parent, device_t self, void *aux) 83 { 84 struct imxclock_softc *sc = device_private(self); 85 struct axi_attach_args *aa = aux; 86 87 aprint_normal("\n"); 88 89 sc->sc_dev = self; 90 sc->sc_iot = aa->aa_iot; 91 sc->sc_intr = aa->aa_irq; 92 93 switch ( aa->aa_addr ) { 94 case EPIT1_BASE: 95 epit1_sc = sc; 96 break; 97 case EPIT2_BASE: 98 epit2_sc = sc; 99 break; 100 default: 101 panic("%s: invalid address %p", device_xname(self), (void *)aa->aa_addr); 102 break; 103 } 104 105 if (bus_space_map(aa->aa_iot, aa->aa_addr, aa->aa_size, 0, &sc->sc_ioh)) 106 panic("%s: Cannot map registers", device_xname(self)); 107 108 sc->sc_clksrc = EPITCR_CLKSRC_IPG; 109 } 110 111 int 112 imxclock_get_timerfreq(struct imxclock_softc *sc) 113 { 114 unsigned int ipg_freq; 115 #if NIMXCCM > 0 116 ipg_freq = imx51_get_clock(IMX51CLK_IPG_CLK_ROOT); 117 #else 118 #ifndef IMX51_IPGCLK_FREQ 119 #error IMX51_IPGCLK_FREQ need to be defined. 120 #endif 121 ipg_freq = IMX51_IPGCLK_FREQ; 122 #endif 123 124 return ipg_freq; 125 } 126 127