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74889e41 CK |
1 | /* |
2 | * pervasive backend for the cbe_cpufreq driver | |
3 | * | |
4 | * This driver makes use of the pervasive unit to | |
5 | * engage the desired frequency. | |
6 | * | |
7 | * (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007 | |
8 | * | |
9 | * Author: Christian Krafft <krafft@de.ibm.com> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2, or (at your option) | |
14 | * any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
24 | */ | |
25 | ||
26 | #include <linux/io.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/time.h> | |
29 | #include <asm/machdep.h> | |
30 | #include <asm/hw_irq.h> | |
eef686a0 | 31 | #include <asm/cell-regs.h> |
74889e41 | 32 | |
6eb1c377 | 33 | #include "ppc_cbe_cpufreq.h" |
74889e41 CK |
34 | |
35 | /* to write to MIC register */ | |
36 | static u64 MIC_Slow_Fast_Timer_table[] = { | |
37 | [0 ... 7] = 0x007fc00000000000ull, | |
38 | }; | |
39 | ||
40 | /* more values for the MIC */ | |
41 | static u64 MIC_Slow_Next_Timer_table[] = { | |
42 | 0x0000240000000000ull, | |
43 | 0x0000268000000000ull, | |
44 | 0x000029C000000000ull, | |
45 | 0x00002D0000000000ull, | |
46 | 0x0000300000000000ull, | |
47 | 0x0000334000000000ull, | |
48 | 0x000039C000000000ull, | |
49 | 0x00003FC000000000ull, | |
50 | }; | |
51 | ||
52 | ||
53 | int cbe_cpufreq_set_pmode(int cpu, unsigned int pmode) | |
54 | { | |
55 | struct cbe_pmd_regs __iomem *pmd_regs; | |
56 | struct cbe_mic_tm_regs __iomem *mic_tm_regs; | |
54cfd0d5 | 57 | unsigned long flags; |
74889e41 CK |
58 | u64 value; |
59 | #ifdef DEBUG | |
60 | long time; | |
61 | #endif | |
62 | ||
63 | local_irq_save(flags); | |
64 | ||
65 | mic_tm_regs = cbe_get_cpu_mic_tm_regs(cpu); | |
66 | pmd_regs = cbe_get_cpu_pmd_regs(cpu); | |
67 | ||
68 | #ifdef DEBUG | |
69 | time = jiffies; | |
70 | #endif | |
71 | ||
72 | out_be64(&mic_tm_regs->slow_fast_timer_0, MIC_Slow_Fast_Timer_table[pmode]); | |
73 | out_be64(&mic_tm_regs->slow_fast_timer_1, MIC_Slow_Fast_Timer_table[pmode]); | |
74 | ||
75 | out_be64(&mic_tm_regs->slow_next_timer_0, MIC_Slow_Next_Timer_table[pmode]); | |
76 | out_be64(&mic_tm_regs->slow_next_timer_1, MIC_Slow_Next_Timer_table[pmode]); | |
77 | ||
78 | value = in_be64(&pmd_regs->pmcr); | |
79 | /* set bits to zero */ | |
80 | value &= 0xFFFFFFFFFFFFFFF8ull; | |
81 | /* set bits to next pmode */ | |
82 | value |= pmode; | |
83 | ||
84 | out_be64(&pmd_regs->pmcr, value); | |
85 | ||
86 | #ifdef DEBUG | |
87 | /* wait until new pmode appears in status register */ | |
88 | value = in_be64(&pmd_regs->pmsr) & 0x07; | |
89 | while (value != pmode) { | |
90 | cpu_relax(); | |
91 | value = in_be64(&pmd_regs->pmsr) & 0x07; | |
92 | } | |
93 | ||
94 | time = jiffies - time; | |
95 | time = jiffies_to_msecs(time); | |
96 | pr_debug("had to wait %lu ms for a transition using " \ | |
97 | "pervasive unit\n", time); | |
98 | #endif | |
99 | local_irq_restore(flags); | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | ||
105 | int cbe_cpufreq_get_pmode(int cpu) | |
106 | { | |
107 | int ret; | |
108 | struct cbe_pmd_regs __iomem *pmd_regs; | |
109 | ||
110 | pmd_regs = cbe_get_cpu_pmd_regs(cpu); | |
111 | ret = in_be64(&pmd_regs->pmsr) & 0x07; | |
112 | ||
113 | return ret; | |
114 | } | |
115 |