xref: /qemu/hw/misc/imx_ccm.c (revision a88ae037572f23a54cf865e7a07df2d734288927)
1bcc181b0SPeter Chubb /*
2bcc181b0SPeter Chubb  * IMX31 Clock Control Module
3bcc181b0SPeter Chubb  *
4bcc181b0SPeter Chubb  * Copyright (C) 2012 NICTA
5282e74c8SJean-Christophe Dubois  * Updated by Jean-Christophe Dubois <jcd@tribudubois.net>
6bcc181b0SPeter Chubb  *
7bcc181b0SPeter Chubb  * This work is licensed under the terms of the GNU GPL, version 2 or later.
8bcc181b0SPeter Chubb  * See the COPYING file in the top-level directory.
9bcc181b0SPeter Chubb  *
10cb54d868SJean-Christophe Dubois  * This is an abstract base class used to get a common interface to
11cb54d868SJean-Christophe Dubois  * retrieve the CCM frequencies from the various i.MX SOC.
12bcc181b0SPeter Chubb  */
13bcc181b0SPeter Chubb 
148ef94f0bSPeter Maydell #include "qemu/osdep.h"
15282e74c8SJean-Christophe Dubois #include "hw/misc/imx_ccm.h"
1603dd024fSPaolo Bonzini #include "qemu/log.h"
170b8fa32fSMarkus Armbruster #include "qemu/module.h"
18bcc181b0SPeter Chubb 
194a6aa0afSJean-Christophe Dubois #ifndef DEBUG_IMX_CCM
204a6aa0afSJean-Christophe Dubois #define DEBUG_IMX_CCM 0
21bcc181b0SPeter Chubb #endif
22bcc181b0SPeter Chubb 
234a6aa0afSJean-Christophe Dubois #define DPRINTF(fmt, args...) \
244a6aa0afSJean-Christophe Dubois     do { \
254a6aa0afSJean-Christophe Dubois         if (DEBUG_IMX_CCM) { \
264a6aa0afSJean-Christophe Dubois             fprintf(stderr, "[%s]%s: " fmt , TYPE_IMX_CCM, \
274a6aa0afSJean-Christophe Dubois                                              __func__, ##args); \
284a6aa0afSJean-Christophe Dubois         } \
294a6aa0afSJean-Christophe Dubois     } while (0)
304a6aa0afSJean-Christophe Dubois 
31bcc181b0SPeter Chubb 
32cb54d868SJean-Christophe Dubois uint32_t imx_ccm_get_clock_frequency(IMXCCMState *dev, IMXClk clock)
33bcc181b0SPeter Chubb {
34cb54d868SJean-Christophe Dubois     uint32_t freq = 0;
35fed163c9SEduardo Habkost     IMXCCMClass *klass = IMX_CCM_GET_CLASS(dev);
36bcc181b0SPeter Chubb 
37cb54d868SJean-Christophe Dubois     if (klass->get_clock_frequency) {
38cb54d868SJean-Christophe Dubois         freq = klass->get_clock_frequency(dev, clock);
39bcc181b0SPeter Chubb     }
40cb54d868SJean-Christophe Dubois 
41*a88ae037SAlex Chen     DPRINTF("(clock = %d) = %u\n", clock, freq);
42cb54d868SJean-Christophe Dubois 
43cb54d868SJean-Christophe Dubois     return freq;
44bcc181b0SPeter Chubb }
45bcc181b0SPeter Chubb 
46bcc181b0SPeter Chubb /*
47bcc181b0SPeter Chubb  * Calculate PLL output frequency
48bcc181b0SPeter Chubb  */
49cb54d868SJean-Christophe Dubois uint32_t imx_ccm_calc_pll(uint32_t pllreg, uint32_t base_freq)
50bcc181b0SPeter Chubb {
51cb54d868SJean-Christophe Dubois     int32_t freq;
52bcc181b0SPeter Chubb     int32_t mfn = MFN(pllreg);  /* Numerator */
53bcc181b0SPeter Chubb     uint32_t mfi = MFI(pllreg); /* Integer part */
54bcc181b0SPeter Chubb     uint32_t mfd = 1 + MFD(pllreg); /* Denominator */
55bcc181b0SPeter Chubb     uint32_t pd = 1 + PD(pllreg);   /* Pre-divider */
56bcc181b0SPeter Chubb 
57bcc181b0SPeter Chubb     if (mfi < 5) {
58bcc181b0SPeter Chubb         mfi = 5;
59bcc181b0SPeter Chubb     }
60cb54d868SJean-Christophe Dubois 
61bcc181b0SPeter Chubb     /* mfn is 10-bit signed twos-complement */
62bcc181b0SPeter Chubb     mfn <<= 32 - 10;
63bcc181b0SPeter Chubb     mfn >>= 32 - 10;
64bcc181b0SPeter Chubb 
65cb54d868SJean-Christophe Dubois     freq = ((2 * (base_freq >> 10) * (mfi * mfd + mfn)) /
66bcc181b0SPeter Chubb             (mfd * pd)) << 10;
67bcc181b0SPeter Chubb 
68*a88ae037SAlex Chen     DPRINTF("(pllreg = 0x%08x, base_freq = %u) = %d\n", pllreg, base_freq,
69cb54d868SJean-Christophe Dubois             freq);
70bcc181b0SPeter Chubb 
71cb54d868SJean-Christophe Dubois     return freq;
72bcc181b0SPeter Chubb }
73bcc181b0SPeter Chubb 
748c43a6f0SAndreas Färber static const TypeInfo imx_ccm_info = {
75bcb34c7aSAndreas Färber     .name          = TYPE_IMX_CCM,
76bcc181b0SPeter Chubb     .parent        = TYPE_SYS_BUS_DEVICE,
77bcc181b0SPeter Chubb     .instance_size = sizeof(IMXCCMState),
78cb54d868SJean-Christophe Dubois     .class_size    = sizeof(IMXCCMClass),
79cb54d868SJean-Christophe Dubois     .abstract      = true,
80bcc181b0SPeter Chubb };
81bcc181b0SPeter Chubb 
82bcc181b0SPeter Chubb static void imx_ccm_register_types(void)
83bcc181b0SPeter Chubb {
84bcc181b0SPeter Chubb     type_register_static(&imx_ccm_info);
85bcc181b0SPeter Chubb }
86bcc181b0SPeter Chubb 
87bcc181b0SPeter Chubb type_init(imx_ccm_register_types)
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