xref: /netbsd-src/sys/arch/arm/imx/imx51_clock.c (revision 2868f5bc924ca3b8c5230e5da1bab41f40726260)
1 /*	$NetBSD: imx51_clock.c,v 1.5 2014/07/25 07:49:56 hkenken 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 1.5 2014/07/25 07:49:56 hkenken Exp $");
29 
30 #include "opt_imx.h"
31 #include "opt_imx51clk.h"
32 
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/kernel.h>
36 #include <sys/evcnt.h>
37 #include <sys/atomic.h>
38 #include <sys/time.h>
39 #include <sys/timetc.h>
40 
41 #include <sys/types.h>
42 #include <sys/device.h>
43 
44 #include <dev/clock_subr.h>
45 
46 #include <machine/intr.h>
47 #include <sys/bus.h>
48 
49 #include <arm/cpufunc.h>
50 
51 #include <arm/imx/imx51reg.h>
52 #include <arm/imx/imx51var.h>
53 #include <arm/imx/imxepitreg.h>
54 #include <arm/imx/imx51_ccmvar.h>
55 #include <arm/imx/imxclockvar.h>
56 
57 #include "imxccm.h"	/* if CCM driver is configured into the kernel */
58 
59 
60 
61 static int imxclock_match(device_t, struct cfdata *, void *);
62 static void imxclock_attach(device_t, device_t, void *);
63 
64 struct imxclock_softc *epit1_sc = NULL;
65 struct imxclock_softc *epit2_sc = NULL;
66 
67 CFATTACH_DECL_NEW(imxclock, sizeof(struct imxclock_softc),
68     imxclock_match, imxclock_attach, NULL, NULL);
69 
70 static int
imxclock_match(device_t parent,struct cfdata * match,void * aux)71 imxclock_match(device_t parent, struct cfdata *match, void *aux)
72 {
73 	struct axi_attach_args *aa = aux;
74 
75 	if ( (aa->aa_addr != EPIT1_BASE) &&
76 	     (aa->aa_addr != EPIT2_BASE) ) {
77 		return 0;
78 	}
79 
80 	return 2;
81 }
82 
83 static void
imxclock_attach(device_t parent,device_t self,void * aux)84 imxclock_attach(device_t parent, device_t self, void *aux)
85 {
86 	struct imxclock_softc *sc = device_private(self);
87 	struct axi_attach_args *aa = aux;
88 
89 	aprint_normal("\n");
90 
91 	sc->sc_dev = self;
92 	sc->sc_iot = aa->aa_iot;
93 	sc->sc_intr = aa->aa_irq;
94 
95 	switch ( aa->aa_addr ) {
96 	case EPIT1_BASE:
97 		epit1_sc = sc;
98 		break;
99 	case EPIT2_BASE:
100 		epit2_sc = sc;
101 		break;
102 	default:
103 		panic("%s: invalid address %p", device_xname(self), (void *)aa->aa_addr);
104 		break;
105 	}
106 
107 	if (bus_space_map(aa->aa_iot, aa->aa_addr, aa->aa_size, 0, &sc->sc_ioh))
108 		panic("%s: Cannot map registers", device_xname(self));
109 
110 	sc->sc_clksrc = EPITCR_CLKSRC_IPG;
111 }
112 
113 int
imxclock_get_timerfreq(struct imxclock_softc * sc)114 imxclock_get_timerfreq(struct imxclock_softc *sc)
115 {
116 	unsigned int ipg_freq;
117 #if NIMXCCM > 0
118 	ipg_freq = imx51_get_clock(IMX51CLK_IPG_CLK_ROOT);
119 #else
120 #ifndef	IMX51_IPGCLK_FREQ
121 #error	IMX51_IPGCLK_FREQ need to be defined.
122 #endif
123 	ipg_freq = IMX51_IPGCLK_FREQ;
124 #endif
125 
126 	return ipg_freq;
127 }
128 
129