diff options
author | Eric Miao <eric.miao@marvell.com> | 2008-08-06 03:59:06 -0400 |
---|---|---|
committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-10-07 14:12:59 -0400 |
commit | 4f788bb20047d7f530ad8dfccda74f7ce7a8a0f5 (patch) | |
tree | 743677537086ce576ca73da99181021738faf427 /arch/arm/mach-pxa | |
parent | 5c52de4a6623ac14790d42df69a509631f4db5f6 (diff) |
[ARM] pxa: add preliminary CPUFREQ support for PXA3xx
Signed-off-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-pxa')
-rw-r--r-- | arch/arm/mach-pxa/Makefile | 1 | ||||
-rw-r--r-- | arch/arm/mach-pxa/cpufreq-pxa3xx.c | 258 |
2 files changed, 259 insertions, 0 deletions
diff --git a/arch/arm/mach-pxa/Makefile b/arch/arm/mach-pxa/Makefile index 7ab8a2eddd11..d31c9979cfa3 100644 --- a/arch/arm/mach-pxa/Makefile +++ b/arch/arm/mach-pxa/Makefile | |||
@@ -10,6 +10,7 @@ obj-$(CONFIG_PM) += pm.o sleep.o standby.o | |||
10 | ifeq ($(CONFIG_CPU_FREQ),y) | 10 | ifeq ($(CONFIG_CPU_FREQ),y) |
11 | obj-$(CONFIG_PXA25x) += cpufreq-pxa2xx.o | 11 | obj-$(CONFIG_PXA25x) += cpufreq-pxa2xx.o |
12 | obj-$(CONFIG_PXA27x) += cpufreq-pxa2xx.o | 12 | obj-$(CONFIG_PXA27x) += cpufreq-pxa2xx.o |
13 | obj-$(CONFIG_PXA3xx) += cpufreq-pxa3xx.o | ||
13 | endif | 14 | endif |
14 | 15 | ||
15 | # Generic drivers that other drivers may depend upon | 16 | # Generic drivers that other drivers may depend upon |
diff --git a/arch/arm/mach-pxa/cpufreq-pxa3xx.c b/arch/arm/mach-pxa/cpufreq-pxa3xx.c new file mode 100644 index 000000000000..1ea0c9c0adaf --- /dev/null +++ b/arch/arm/mach-pxa/cpufreq-pxa3xx.c | |||
@@ -0,0 +1,258 @@ | |||
1 | /* | ||
2 | * linux/arch/arm/mach-pxa/cpufreq-pxa3xx.c | ||
3 | * | ||
4 | * Copyright (C) 2008 Marvell International Ltd. | ||
5 | * | ||
6 | * This program is free software; you can redistribute it and/or modify | ||
7 | * it under the terms of the GNU General Public License as published by | ||
8 | * the Free Software Foundation; either version 2 of the License, or | ||
9 | * (at your option) any later version. | ||
10 | */ | ||
11 | |||
12 | #include <linux/kernel.h> | ||
13 | #include <linux/module.h> | ||
14 | #include <linux/sched.h> | ||
15 | #include <linux/init.h> | ||
16 | #include <linux/cpufreq.h> | ||
17 | |||
18 | #include <mach/hardware.h> | ||
19 | #include <mach/pxa-regs.h> | ||
20 | #include <mach/pxa3xx-regs.h> | ||
21 | |||
22 | #include "generic.h" | ||
23 | |||
24 | #define HSS_104M (0) | ||
25 | #define HSS_156M (1) | ||
26 | #define HSS_208M (2) | ||
27 | #define HSS_312M (3) | ||
28 | |||
29 | #define SMCFS_78M (0) | ||
30 | #define SMCFS_104M (2) | ||
31 | #define SMCFS_208M (5) | ||
32 | |||
33 | #define SFLFS_104M (0) | ||
34 | #define SFLFS_156M (1) | ||
35 | #define SFLFS_208M (2) | ||
36 | #define SFLFS_312M (3) | ||
37 | |||
38 | #define XSPCLK_156M (0) | ||
39 | #define XSPCLK_NONE (3) | ||
40 | |||
41 | #define DMCFS_26M (0) | ||
42 | #define DMCFS_260M (3) | ||
43 | |||
44 | struct pxa3xx_freq_info { | ||
45 | unsigned int cpufreq_mhz; | ||
46 | unsigned int core_xl : 5; | ||
47 | unsigned int core_xn : 3; | ||
48 | unsigned int hss : 2; | ||
49 | unsigned int dmcfs : 2; | ||
50 | unsigned int smcfs : 3; | ||
51 | unsigned int sflfs : 2; | ||
52 | unsigned int df_clkdiv : 3; | ||
53 | |||
54 | int vcc_core; /* in mV */ | ||
55 | int vcc_sram; /* in mV */ | ||
56 | }; | ||
57 | |||
58 | #define OP(cpufreq, _xl, _xn, _hss, _dmc, _smc, _sfl, _dfi, vcore, vsram) \ | ||
59 | { \ | ||
60 | .cpufreq_mhz = cpufreq, \ | ||
61 | .core_xl = _xl, \ | ||
62 | .core_xn = _xn, \ | ||
63 | .hss = HSS_##_hss##M, \ | ||
64 | .dmcfs = DMCFS_##_dmc##M, \ | ||
65 | .smcfs = SMCFS_##_smc##M, \ | ||
66 | .sflfs = SFLFS_##_sfl##M, \ | ||
67 | .df_clkdiv = _dfi, \ | ||
68 | .vcc_core = vcore, \ | ||
69 | .vcc_sram = vsram, \ | ||
70 | } | ||
71 | |||
72 | static struct pxa3xx_freq_info pxa300_freqs[] = { | ||
73 | /* CPU XL XN HSS DMEM SMEM SRAM DFI VCC_CORE VCC_SRAM */ | ||
74 | OP(104, 8, 1, 104, 260, 78, 104, 3, 1000, 1100), /* 104MHz */ | ||
75 | OP(208, 16, 1, 104, 260, 104, 156, 2, 1000, 1100), /* 208MHz */ | ||
76 | OP(416, 16, 2, 156, 260, 104, 208, 2, 1100, 1200), /* 416MHz */ | ||
77 | OP(624, 24, 2, 208, 260, 208, 312, 3, 1375, 1400), /* 624MHz */ | ||
78 | }; | ||
79 | |||
80 | static struct pxa3xx_freq_info pxa320_freqs[] = { | ||
81 | /* CPU XL XN HSS DMEM SMEM SRAM DFI VCC_CORE VCC_SRAM */ | ||
82 | OP(104, 8, 1, 104, 260, 78, 104, 3, 1000, 1100), /* 104MHz */ | ||
83 | OP(208, 16, 1, 104, 260, 104, 156, 2, 1000, 1100), /* 208MHz */ | ||
84 | OP(416, 16, 2, 156, 260, 104, 208, 2, 1100, 1200), /* 416MHz */ | ||
85 | OP(624, 24, 2, 208, 260, 208, 312, 3, 1375, 1400), /* 624MHz */ | ||
86 | OP(806, 31, 2, 208, 260, 208, 312, 3, 1400, 1400), /* 806MHz */ | ||
87 | }; | ||
88 | |||
89 | static unsigned int pxa3xx_freqs_num; | ||
90 | static struct pxa3xx_freq_info *pxa3xx_freqs; | ||
91 | static struct cpufreq_frequency_table *pxa3xx_freqs_table; | ||
92 | |||
93 | static int setup_freqs_table(struct cpufreq_policy *policy, | ||
94 | struct pxa3xx_freq_info *freqs, int num) | ||
95 | { | ||
96 | struct cpufreq_frequency_table *table; | ||
97 | int i; | ||
98 | |||
99 | table = kzalloc((num + 1) * sizeof(*table), GFP_KERNEL); | ||
100 | if (table == NULL) | ||
101 | return -ENOMEM; | ||
102 | |||
103 | for (i = 0; i < num; i++) { | ||
104 | table[i].index = i; | ||
105 | table[i].frequency = freqs[i].cpufreq_mhz * 1000; | ||
106 | } | ||
107 | table[num].frequency = i; | ||
108 | table[num].frequency = CPUFREQ_TABLE_END; | ||
109 | |||
110 | pxa3xx_freqs = freqs; | ||
111 | pxa3xx_freqs_num = num; | ||
112 | pxa3xx_freqs_table = table; | ||
113 | |||
114 | return cpufreq_frequency_table_cpuinfo(policy, table); | ||
115 | } | ||
116 | |||
117 | static void __update_core_freq(struct pxa3xx_freq_info *info) | ||
118 | { | ||
119 | uint32_t mask = ACCR_XN_MASK | ACCR_XL_MASK; | ||
120 | uint32_t accr = ACCR; | ||
121 | uint32_t xclkcfg; | ||
122 | |||
123 | accr &= ~(ACCR_XN_MASK | ACCR_XL_MASK | ACCR_XSPCLK_MASK); | ||
124 | accr |= ACCR_XN(info->core_xn) | ACCR_XL(info->core_xl); | ||
125 | |||
126 | /* No clock until core PLL is re-locked */ | ||
127 | accr |= ACCR_XSPCLK(XSPCLK_NONE); | ||
128 | |||
129 | xclkcfg = (info->core_xn == 2) ? 0x3 : 0x2; /* turbo bit */ | ||
130 | |||
131 | ACCR = accr; | ||
132 | __asm__("mcr p14, 0, %0, c6, c0, 0\n" : : "r"(xclkcfg)); | ||
133 | |||
134 | while ((ACSR & mask) != (accr & mask)) | ||
135 | cpu_relax(); | ||
136 | } | ||
137 | |||
138 | static void __update_bus_freq(struct pxa3xx_freq_info *info) | ||
139 | { | ||
140 | uint32_t mask; | ||
141 | uint32_t accr = ACCR; | ||
142 | |||
143 | mask = ACCR_SMCFS_MASK | ACCR_SFLFS_MASK | ACCR_HSS_MASK | | ||
144 | ACCR_DMCFS_MASK; | ||
145 | |||
146 | accr &= ~mask; | ||
147 | accr |= ACCR_SMCFS(info->smcfs) | ACCR_SFLFS(info->sflfs) | | ||
148 | ACCR_HSS(info->hss) | ACCR_DMCFS(info->dmcfs); | ||
149 | |||
150 | ACCR = accr; | ||
151 | |||
152 | while ((ACSR & mask) != (accr & mask)) | ||
153 | cpu_relax(); | ||
154 | } | ||
155 | |||
156 | static int pxa3xx_cpufreq_verify(struct cpufreq_policy *policy) | ||
157 | { | ||
158 | return cpufreq_frequency_table_verify(policy, pxa3xx_freqs_table); | ||
159 | } | ||
160 | |||
161 | static unsigned int pxa3xx_cpufreq_get(unsigned int cpu) | ||
162 | { | ||
163 | return get_clk_frequency_khz(0); | ||
164 | } | ||
165 | |||
166 | static int pxa3xx_cpufreq_set(struct cpufreq_policy *policy, | ||
167 | unsigned int target_freq, | ||
168 | unsigned int relation) | ||
169 | { | ||
170 | struct pxa3xx_freq_info *next; | ||
171 | struct cpufreq_freqs freqs; | ||
172 | unsigned long flags; | ||
173 | int idx; | ||
174 | |||
175 | if (policy->cpu != 0) | ||
176 | return -EINVAL; | ||
177 | |||
178 | /* Lookup the next frequency */ | ||
179 | if (cpufreq_frequency_table_target(policy, pxa3xx_freqs_table, | ||
180 | target_freq, relation, &idx)) | ||
181 | return -EINVAL; | ||
182 | |||
183 | next = &pxa3xx_freqs[idx]; | ||
184 | |||
185 | freqs.old = policy->cur; | ||
186 | freqs.new = next->cpufreq_mhz * 1000; | ||
187 | freqs.cpu = policy->cpu; | ||
188 | |||
189 | pr_debug("CPU frequency from %d MHz to %d MHz%s\n", | ||
190 | freqs.old / 1000, freqs.new / 1000, | ||
191 | (freqs.old == freqs.new) ? " (skipped)" : ""); | ||
192 | |||
193 | if (freqs.old == target_freq) | ||
194 | return 0; | ||
195 | |||
196 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); | ||
197 | |||
198 | local_irq_save(flags); | ||
199 | __update_core_freq(next); | ||
200 | __update_bus_freq(next); | ||
201 | local_irq_restore(flags); | ||
202 | |||
203 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); | ||
204 | |||
205 | return 0; | ||
206 | } | ||
207 | |||
208 | static __init int pxa3xx_cpufreq_init(struct cpufreq_policy *policy) | ||
209 | { | ||
210 | int ret = -EINVAL; | ||
211 | |||
212 | /* set default policy and cpuinfo */ | ||
213 | policy->governor = CPUFREQ_DEFAULT_GOVERNOR; | ||
214 | policy->cpuinfo.min_freq = 104000; | ||
215 | policy->cpuinfo.max_freq = (cpu_is_pxa320()) ? 806000 : 624000; | ||
216 | policy->cpuinfo.transition_latency = 1000; /* FIXME: 1 ms, assumed */ | ||
217 | policy->cur = policy->min = policy->max = get_clk_frequency_khz(0); | ||
218 | |||
219 | if (cpu_is_pxa300() || cpu_is_pxa310()) | ||
220 | ret = setup_freqs_table(policy, ARRAY_AND_SIZE(pxa300_freqs)); | ||
221 | |||
222 | if (cpu_is_pxa320()) | ||
223 | ret = setup_freqs_table(policy, ARRAY_AND_SIZE(pxa320_freqs)); | ||
224 | |||
225 | if (ret) { | ||
226 | pr_err("failed to setup frequency table\n"); | ||
227 | return ret; | ||
228 | } | ||
229 | |||
230 | pr_info("CPUFREQ support for PXA3xx initialized\n"); | ||
231 | return 0; | ||
232 | } | ||
233 | |||
234 | static struct cpufreq_driver pxa3xx_cpufreq_driver = { | ||
235 | .verify = pxa3xx_cpufreq_verify, | ||
236 | .target = pxa3xx_cpufreq_set, | ||
237 | .init = pxa3xx_cpufreq_init, | ||
238 | .get = pxa3xx_cpufreq_get, | ||
239 | .name = "pxa3xx-cpufreq", | ||
240 | }; | ||
241 | |||
242 | static int __init cpufreq_init(void) | ||
243 | { | ||
244 | if (cpu_is_pxa3xx()) | ||
245 | return cpufreq_register_driver(&pxa3xx_cpufreq_driver); | ||
246 | |||
247 | return 0; | ||
248 | } | ||
249 | module_init(cpufreq_init); | ||
250 | |||
251 | static void __exit cpufreq_exit(void) | ||
252 | { | ||
253 | cpufreq_unregister_driver(&pxa3xx_cpufreq_driver); | ||
254 | } | ||
255 | module_exit(cpufreq_exit); | ||
256 | |||
257 | MODULE_DESCRIPTION("CPU frequency scaling driver for PXA3xx"); | ||
258 | MODULE_LICENSE("GPL"); | ||