diff options
author | Christian Krafft <krafft@de.ibm.com> | 2007-07-20 15:39:22 -0400 |
---|---|---|
committer | Arnd Bergmann <arnd@klappe.arndb.de> | 2007-07-20 15:41:38 -0400 |
commit | 74889e41d9a1f80928130a02af9b010673bc5ba7 (patch) | |
tree | 300feac7ceaad88b090ba385abd414281033425a /arch/powerpc/platforms/cell/cbe_cpufreq_pervasive.c | |
parent | 1e21fd5af3797a2c322e1723c69732e77aa74f48 (diff) |
[CELL] cbe_cpufreq: reorganize code
This patch reorganizes the code of the driver into three files.
Two cbe_cpufreq_pmi.c and cbe_cpufreq_pervasive.c care about hardware.
cbe_cpufreq.c contains the logic.
There is no changed behaviour, except that the PMI related function
is now located in a seperate module cbe_cpufreq_pmi. This module
will be required by cbe_cpufreq, if CONFIG_CBE_CPUFREQ_PMI has been set.
Signed-off-by: Christian Krafft <krafft@de.ibm.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Diffstat (limited to 'arch/powerpc/platforms/cell/cbe_cpufreq_pervasive.c')
-rw-r--r-- | arch/powerpc/platforms/cell/cbe_cpufreq_pervasive.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/cell/cbe_cpufreq_pervasive.c b/arch/powerpc/platforms/cell/cbe_cpufreq_pervasive.c new file mode 100644 index 000000000000..163263b3e1cd --- /dev/null +++ b/arch/powerpc/platforms/cell/cbe_cpufreq_pervasive.c | |||
@@ -0,0 +1,115 @@ | |||
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> | ||
31 | |||
32 | #include "cbe_regs.h" | ||
33 | #include "cbe_cpufreq.h" | ||
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; | ||
57 | u64 flags; | ||
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 | |||