diff options
author | Dave Jones <davej@redhat.com> | 2005-05-31 22:03:45 -0400 |
---|---|---|
committer | Dave Jones <davej@redhat.com> | 2005-05-31 22:03:45 -0400 |
commit | bf6fc9fd2d848d06b8f6c4caccef1dba9ef8c4c6 (patch) | |
tree | 5b70d44fcdd24a720ae857a7c16ae4c543465f15 /arch/i386 | |
parent | 3310010818aa12145905faf97ffe3742acc842e2 (diff) |
[CPUFREQ] AMD Elan SC520 cpufreq driver.
From: Sean Young <sean@mess.org>
Signed-off-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'arch/i386')
-rw-r--r-- | arch/i386/kernel/cpu/cpufreq/Kconfig | 14 | ||||
-rw-r--r-- | arch/i386/kernel/cpu/cpufreq/Makefile | 1 | ||||
-rw-r--r-- | arch/i386/kernel/cpu/cpufreq/sc520_freq.c | 186 |
3 files changed, 200 insertions, 1 deletions
diff --git a/arch/i386/kernel/cpu/cpufreq/Kconfig b/arch/i386/kernel/cpu/cpufreq/Kconfig index f25ffd74235c..0f1eb507233b 100644 --- a/arch/i386/kernel/cpu/cpufreq/Kconfig +++ b/arch/i386/kernel/cpu/cpufreq/Kconfig | |||
@@ -23,7 +23,7 @@ config X86_ACPI_CPUFREQ | |||
23 | If in doubt, say N. | 23 | If in doubt, say N. |
24 | 24 | ||
25 | config ELAN_CPUFREQ | 25 | config ELAN_CPUFREQ |
26 | tristate "AMD Elan" | 26 | tristate "AMD Elan SC400 and SC410" |
27 | select CPU_FREQ_TABLE | 27 | select CPU_FREQ_TABLE |
28 | depends on X86_ELAN | 28 | depends on X86_ELAN |
29 | ---help--- | 29 | ---help--- |
@@ -38,6 +38,18 @@ config ELAN_CPUFREQ | |||
38 | 38 | ||
39 | If in doubt, say N. | 39 | If in doubt, say N. |
40 | 40 | ||
41 | config SC520_CPUFREQ | ||
42 | tristate "AMD Elan SC520" | ||
43 | select CPU_FREQ_TABLE | ||
44 | depends on X86_ELAN | ||
45 | ---help--- | ||
46 | This adds the CPUFreq driver for AMD Elan SC520 processor. | ||
47 | |||
48 | For details, take a look at <file:Documentation/cpu-freq/>. | ||
49 | |||
50 | If in doubt, say N. | ||
51 | |||
52 | |||
41 | config X86_POWERNOW_K6 | 53 | config X86_POWERNOW_K6 |
42 | tristate "AMD Mobile K6-2/K6-3 PowerNow!" | 54 | tristate "AMD Mobile K6-2/K6-3 PowerNow!" |
43 | select CPU_FREQ_TABLE | 55 | select CPU_FREQ_TABLE |
diff --git a/arch/i386/kernel/cpu/cpufreq/Makefile b/arch/i386/kernel/cpu/cpufreq/Makefile index a922e97aeedd..2e894f1c8910 100644 --- a/arch/i386/kernel/cpu/cpufreq/Makefile +++ b/arch/i386/kernel/cpu/cpufreq/Makefile | |||
@@ -3,6 +3,7 @@ obj-$(CONFIG_X86_POWERNOW_K7) += powernow-k7.o | |||
3 | obj-$(CONFIG_X86_POWERNOW_K8) += powernow-k8.o | 3 | obj-$(CONFIG_X86_POWERNOW_K8) += powernow-k8.o |
4 | obj-$(CONFIG_X86_LONGHAUL) += longhaul.o | 4 | obj-$(CONFIG_X86_LONGHAUL) += longhaul.o |
5 | obj-$(CONFIG_ELAN_CPUFREQ) += elanfreq.o | 5 | obj-$(CONFIG_ELAN_CPUFREQ) += elanfreq.o |
6 | obj-$(CONFIG_SC520_CPUFREQ) += sc520_freq.o | ||
6 | obj-$(CONFIG_X86_LONGRUN) += longrun.o | 7 | obj-$(CONFIG_X86_LONGRUN) += longrun.o |
7 | obj-$(CONFIG_X86_GX_SUSPMOD) += gx-suspmod.o | 8 | obj-$(CONFIG_X86_GX_SUSPMOD) += gx-suspmod.o |
8 | obj-$(CONFIG_X86_SPEEDSTEP_ICH) += speedstep-ich.o | 9 | obj-$(CONFIG_X86_SPEEDSTEP_ICH) += speedstep-ich.o |
diff --git a/arch/i386/kernel/cpu/cpufreq/sc520_freq.c b/arch/i386/kernel/cpu/cpufreq/sc520_freq.c new file mode 100644 index 000000000000..ef457d50f4ac --- /dev/null +++ b/arch/i386/kernel/cpu/cpufreq/sc520_freq.c | |||
@@ -0,0 +1,186 @@ | |||
1 | /* | ||
2 | * sc520_freq.c: cpufreq driver for the AMD Elan sc520 | ||
3 | * | ||
4 | * Copyright (C) 2005 Sean Young <sean@mess.org> | ||
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; either version | ||
9 | * 2 of the License, or (at your option) any later version. | ||
10 | * | ||
11 | * Based on elanfreq.c | ||
12 | * | ||
13 | * 2005-03-30: - initial revision | ||
14 | */ | ||
15 | |||
16 | #include <linux/kernel.h> | ||
17 | #include <linux/module.h> | ||
18 | #include <linux/init.h> | ||
19 | |||
20 | #include <linux/delay.h> | ||
21 | #include <linux/cpufreq.h> | ||
22 | |||
23 | #include <asm/msr.h> | ||
24 | #include <asm/timex.h> | ||
25 | #include <asm/io.h> | ||
26 | |||
27 | #define MMCR_BASE 0xfffef000 /* The default base address */ | ||
28 | #define OFFS_CPUCTL 0x2 /* CPU Control Register */ | ||
29 | |||
30 | static __u8 __iomem *cpuctl; | ||
31 | |||
32 | #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "sc520_freq", msg) | ||
33 | |||
34 | static struct cpufreq_frequency_table sc520_freq_table[] = { | ||
35 | {0x01, 100000}, | ||
36 | {0x02, 133000}, | ||
37 | {0, CPUFREQ_TABLE_END}, | ||
38 | }; | ||
39 | |||
40 | static unsigned int sc520_freq_get_cpu_frequency(unsigned int cpu) | ||
41 | { | ||
42 | u8 clockspeed_reg = *cpuctl; | ||
43 | |||
44 | switch (clockspeed_reg & 0x03) { | ||
45 | default: | ||
46 | printk(KERN_ERR "sc520_freq: error: cpuctl register has unexpected value %02x\n", clockspeed_reg); | ||
47 | case 0x01: | ||
48 | return 100000; | ||
49 | case 0x02: | ||
50 | return 133000; | ||
51 | } | ||
52 | } | ||
53 | |||
54 | static void sc520_freq_set_cpu_state (unsigned int state) | ||
55 | { | ||
56 | |||
57 | struct cpufreq_freqs freqs; | ||
58 | u8 clockspeed_reg; | ||
59 | |||
60 | freqs.old = sc520_freq_get_cpu_frequency(0); | ||
61 | freqs.new = sc520_freq_table[state].frequency; | ||
62 | freqs.cpu = 0; /* AMD Elan is UP */ | ||
63 | |||
64 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); | ||
65 | |||
66 | dprintk("attempting to set frequency to %i kHz\n", | ||
67 | sc520_freq_table[state].frequency); | ||
68 | |||
69 | local_irq_disable(); | ||
70 | |||
71 | clockspeed_reg = *cpuctl & ~0x03; | ||
72 | *cpuctl = clockspeed_reg | sc520_freq_table[state].index; | ||
73 | |||
74 | local_irq_enable(); | ||
75 | |||
76 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); | ||
77 | }; | ||
78 | |||
79 | static int sc520_freq_verify (struct cpufreq_policy *policy) | ||
80 | { | ||
81 | return cpufreq_frequency_table_verify(policy, &sc520_freq_table[0]); | ||
82 | } | ||
83 | |||
84 | static int sc520_freq_target (struct cpufreq_policy *policy, | ||
85 | unsigned int target_freq, | ||
86 | unsigned int relation) | ||
87 | { | ||
88 | unsigned int newstate = 0; | ||
89 | |||
90 | if (cpufreq_frequency_table_target(policy, sc520_freq_table, target_freq, relation, &newstate)) | ||
91 | return -EINVAL; | ||
92 | |||
93 | sc520_freq_set_cpu_state(newstate); | ||
94 | |||
95 | return 0; | ||
96 | } | ||
97 | |||
98 | |||
99 | /* | ||
100 | * Module init and exit code | ||
101 | */ | ||
102 | |||
103 | static int sc520_freq_cpu_init(struct cpufreq_policy *policy) | ||
104 | { | ||
105 | struct cpuinfo_x86 *c = cpu_data; | ||
106 | int result; | ||
107 | |||
108 | /* capability check */ | ||
109 | if (c->x86_vendor != X86_VENDOR_AMD || | ||
110 | c->x86 != 4 || c->x86_model != 9) | ||
111 | return -ENODEV; | ||
112 | |||
113 | /* cpuinfo and default policy values */ | ||
114 | policy->governor = CPUFREQ_DEFAULT_GOVERNOR; | ||
115 | policy->cpuinfo.transition_latency = 1000000; /* 1ms */ | ||
116 | policy->cur = sc520_freq_get_cpu_frequency(0); | ||
117 | |||
118 | result = cpufreq_frequency_table_cpuinfo(policy, sc520_freq_table); | ||
119 | if (result) | ||
120 | return (result); | ||
121 | |||
122 | cpufreq_frequency_table_get_attr(sc520_freq_table, policy->cpu); | ||
123 | |||
124 | return 0; | ||
125 | } | ||
126 | |||
127 | |||
128 | static int sc520_freq_cpu_exit(struct cpufreq_policy *policy) | ||
129 | { | ||
130 | cpufreq_frequency_table_put_attr(policy->cpu); | ||
131 | return 0; | ||
132 | } | ||
133 | |||
134 | |||
135 | static struct freq_attr* sc520_freq_attr[] = { | ||
136 | &cpufreq_freq_attr_scaling_available_freqs, | ||
137 | NULL, | ||
138 | }; | ||
139 | |||
140 | |||
141 | static struct cpufreq_driver sc520_freq_driver = { | ||
142 | .get = sc520_freq_get_cpu_frequency, | ||
143 | .verify = sc520_freq_verify, | ||
144 | .target = sc520_freq_target, | ||
145 | .init = sc520_freq_cpu_init, | ||
146 | .exit = sc520_freq_cpu_exit, | ||
147 | .name = "sc520_freq", | ||
148 | .owner = THIS_MODULE, | ||
149 | .attr = sc520_freq_attr, | ||
150 | }; | ||
151 | |||
152 | |||
153 | static int __init sc520_freq_init(void) | ||
154 | { | ||
155 | struct cpuinfo_x86 *c = cpu_data; | ||
156 | |||
157 | /* Test if we have the right hardware */ | ||
158 | if(c->x86_vendor != X86_VENDOR_AMD || | ||
159 | c->x86 != 4 || c->x86_model != 9) { | ||
160 | dprintk("no Elan SC520 processor found!\n"); | ||
161 | return -ENODEV; | ||
162 | } | ||
163 | cpuctl = ioremap((unsigned long)(MMCR_BASE + OFFS_CPUCTL), 1); | ||
164 | if(!cpuctl) { | ||
165 | printk(KERN_ERR "sc520_freq: error: failed to remap memory\n"); | ||
166 | return -ENOMEM; | ||
167 | } | ||
168 | |||
169 | return cpufreq_register_driver(&sc520_freq_driver); | ||
170 | } | ||
171 | |||
172 | |||
173 | static void __exit sc520_freq_exit(void) | ||
174 | { | ||
175 | cpufreq_unregister_driver(&sc520_freq_driver); | ||
176 | iounmap(cpuctl); | ||
177 | } | ||
178 | |||
179 | |||
180 | MODULE_LICENSE("GPL"); | ||
181 | MODULE_AUTHOR("Sean Young <sean@mess.org>"); | ||
182 | MODULE_DESCRIPTION("cpufreq driver for AMD's Elan sc520 CPU"); | ||
183 | |||
184 | module_init(sc520_freq_init); | ||
185 | module_exit(sc520_freq_exit); | ||
186 | |||