Merge remote-tracking branch 'asoc/topic/component' into asoc-next
[linux-2.6-block.git] / arch / x86 / platform / intel-mid / mfld.c
1 /*
2  * mfld.c: Intel Medfield platform setup code
3  *
4  * (C) Copyright 2013 Intel Corporation
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; version 2
9  * of the License.
10  */
11
12 #include <linux/init.h>
13
14 #include <asm/apic.h>
15 #include <asm/intel-mid.h>
16 #include <asm/intel_mid_vrtc.h>
17
18 #include "intel_mid_weak_decls.h"
19
20 static void penwell_arch_setup(void);
21 /* penwell arch ops */
22 static struct intel_mid_ops penwell_ops = {
23         .arch_setup = penwell_arch_setup,
24 };
25
26 static void mfld_power_off(void)
27 {
28 }
29
30 static unsigned long __init mfld_calibrate_tsc(void)
31 {
32         unsigned long fast_calibrate;
33         u32 lo, hi, ratio, fsb;
34
35         rdmsr(MSR_IA32_PERF_STATUS, lo, hi);
36         pr_debug("IA32 perf status is 0x%x, 0x%0x\n", lo, hi);
37         ratio = (hi >> 8) & 0x1f;
38         pr_debug("ratio is %d\n", ratio);
39         if (!ratio) {
40                 pr_err("read a zero ratio, should be incorrect!\n");
41                 pr_err("force tsc ratio to 16 ...\n");
42                 ratio = 16;
43         }
44         rdmsr(MSR_FSB_FREQ, lo, hi);
45         if ((lo & 0x7) == 0x7)
46                 fsb = FSB_FREQ_83SKU;
47         else
48                 fsb = FSB_FREQ_100SKU;
49         fast_calibrate = ratio * fsb;
50         pr_debug("read penwell tsc %lu khz\n", fast_calibrate);
51         lapic_timer_frequency = fsb * 1000 / HZ;
52
53         /*
54          * TSC on Intel Atom SoCs is reliable and of known frequency.
55          * See tsc_msr.c for details.
56          */
57         setup_force_cpu_cap(X86_FEATURE_TSC_KNOWN_FREQ);
58         setup_force_cpu_cap(X86_FEATURE_TSC_RELIABLE);
59
60         return fast_calibrate;
61 }
62
63 static void __init penwell_arch_setup(void)
64 {
65         x86_platform.calibrate_tsc = mfld_calibrate_tsc;
66         pm_power_off = mfld_power_off;
67 }
68
69 void *get_penwell_ops(void)
70 {
71         return &penwell_ops;
72 }
73
74 void *get_cloverview_ops(void)
75 {
76         return &penwell_ops;
77 }