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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 | ||
4f788bb2 EM |
18 | #include <mach/pxa3xx-regs.h> |
19 | ||
20 | #include "generic.h" | |
21 | ||
22 | #define HSS_104M (0) | |
23 | #define HSS_156M (1) | |
24 | #define HSS_208M (2) | |
25 | #define HSS_312M (3) | |
26 | ||
27 | #define SMCFS_78M (0) | |
28 | #define SMCFS_104M (2) | |
29 | #define SMCFS_208M (5) | |
30 | ||
31 | #define SFLFS_104M (0) | |
32 | #define SFLFS_156M (1) | |
33 | #define SFLFS_208M (2) | |
34 | #define SFLFS_312M (3) | |
35 | ||
36 | #define XSPCLK_156M (0) | |
37 | #define XSPCLK_NONE (3) | |
38 | ||
39 | #define DMCFS_26M (0) | |
40 | #define DMCFS_260M (3) | |
41 | ||
42 | struct pxa3xx_freq_info { | |
43 | unsigned int cpufreq_mhz; | |
44 | unsigned int core_xl : 5; | |
45 | unsigned int core_xn : 3; | |
46 | unsigned int hss : 2; | |
47 | unsigned int dmcfs : 2; | |
48 | unsigned int smcfs : 3; | |
49 | unsigned int sflfs : 2; | |
50 | unsigned int df_clkdiv : 3; | |
51 | ||
52 | int vcc_core; /* in mV */ | |
53 | int vcc_sram; /* in mV */ | |
54 | }; | |
55 | ||
56 | #define OP(cpufreq, _xl, _xn, _hss, _dmc, _smc, _sfl, _dfi, vcore, vsram) \ | |
57 | { \ | |
58 | .cpufreq_mhz = cpufreq, \ | |
59 | .core_xl = _xl, \ | |
60 | .core_xn = _xn, \ | |
61 | .hss = HSS_##_hss##M, \ | |
62 | .dmcfs = DMCFS_##_dmc##M, \ | |
63 | .smcfs = SMCFS_##_smc##M, \ | |
64 | .sflfs = SFLFS_##_sfl##M, \ | |
65 | .df_clkdiv = _dfi, \ | |
66 | .vcc_core = vcore, \ | |
67 | .vcc_sram = vsram, \ | |
68 | } | |
69 | ||
70 | static struct pxa3xx_freq_info pxa300_freqs[] = { | |
71 | /* CPU XL XN HSS DMEM SMEM SRAM DFI VCC_CORE VCC_SRAM */ | |
72 | OP(104, 8, 1, 104, 260, 78, 104, 3, 1000, 1100), /* 104MHz */ | |
73 | OP(208, 16, 1, 104, 260, 104, 156, 2, 1000, 1100), /* 208MHz */ | |
74 | OP(416, 16, 2, 156, 260, 104, 208, 2, 1100, 1200), /* 416MHz */ | |
75 | OP(624, 24, 2, 208, 260, 208, 312, 3, 1375, 1400), /* 624MHz */ | |
76 | }; | |
77 | ||
78 | static struct pxa3xx_freq_info pxa320_freqs[] = { | |
79 | /* CPU XL XN HSS DMEM SMEM SRAM DFI VCC_CORE VCC_SRAM */ | |
80 | OP(104, 8, 1, 104, 260, 78, 104, 3, 1000, 1100), /* 104MHz */ | |
81 | OP(208, 16, 1, 104, 260, 104, 156, 2, 1000, 1100), /* 208MHz */ | |
82 | OP(416, 16, 2, 156, 260, 104, 208, 2, 1100, 1200), /* 416MHz */ | |
83 | OP(624, 24, 2, 208, 260, 208, 312, 3, 1375, 1400), /* 624MHz */ | |
84 | OP(806, 31, 2, 208, 260, 208, 312, 3, 1400, 1400), /* 806MHz */ | |
85 | }; | |
86 | ||
87 | static unsigned int pxa3xx_freqs_num; | |
88 | static struct pxa3xx_freq_info *pxa3xx_freqs; | |
89 | static struct cpufreq_frequency_table *pxa3xx_freqs_table; | |
90 | ||
91 | static int setup_freqs_table(struct cpufreq_policy *policy, | |
92 | struct pxa3xx_freq_info *freqs, int num) | |
93 | { | |
94 | struct cpufreq_frequency_table *table; | |
95 | int i; | |
96 | ||
97 | table = kzalloc((num + 1) * sizeof(*table), GFP_KERNEL); | |
98 | if (table == NULL) | |
99 | return -ENOMEM; | |
100 | ||
101 | for (i = 0; i < num; i++) { | |
102 | table[i].index = i; | |
103 | table[i].frequency = freqs[i].cpufreq_mhz * 1000; | |
104 | } | |
68a31de3 | 105 | table[num].index = i; |
4f788bb2 EM |
106 | table[num].frequency = CPUFREQ_TABLE_END; |
107 | ||
108 | pxa3xx_freqs = freqs; | |
109 | pxa3xx_freqs_num = num; | |
110 | pxa3xx_freqs_table = table; | |
111 | ||
112 | return cpufreq_frequency_table_cpuinfo(policy, table); | |
113 | } | |
114 | ||
115 | static void __update_core_freq(struct pxa3xx_freq_info *info) | |
116 | { | |
117 | uint32_t mask = ACCR_XN_MASK | ACCR_XL_MASK; | |
118 | uint32_t accr = ACCR; | |
119 | uint32_t xclkcfg; | |
120 | ||
121 | accr &= ~(ACCR_XN_MASK | ACCR_XL_MASK | ACCR_XSPCLK_MASK); | |
122 | accr |= ACCR_XN(info->core_xn) | ACCR_XL(info->core_xl); | |
123 | ||
124 | /* No clock until core PLL is re-locked */ | |
125 | accr |= ACCR_XSPCLK(XSPCLK_NONE); | |
126 | ||
127 | xclkcfg = (info->core_xn == 2) ? 0x3 : 0x2; /* turbo bit */ | |
128 | ||
129 | ACCR = accr; | |
130 | __asm__("mcr p14, 0, %0, c6, c0, 0\n" : : "r"(xclkcfg)); | |
131 | ||
132 | while ((ACSR & mask) != (accr & mask)) | |
133 | cpu_relax(); | |
134 | } | |
135 | ||
136 | static void __update_bus_freq(struct pxa3xx_freq_info *info) | |
137 | { | |
138 | uint32_t mask; | |
139 | uint32_t accr = ACCR; | |
140 | ||
141 | mask = ACCR_SMCFS_MASK | ACCR_SFLFS_MASK | ACCR_HSS_MASK | | |
142 | ACCR_DMCFS_MASK; | |
143 | ||
144 | accr &= ~mask; | |
145 | accr |= ACCR_SMCFS(info->smcfs) | ACCR_SFLFS(info->sflfs) | | |
146 | ACCR_HSS(info->hss) | ACCR_DMCFS(info->dmcfs); | |
147 | ||
148 | ACCR = accr; | |
149 | ||
150 | while ((ACSR & mask) != (accr & mask)) | |
151 | cpu_relax(); | |
152 | } | |
153 | ||
154 | static int pxa3xx_cpufreq_verify(struct cpufreq_policy *policy) | |
155 | { | |
156 | return cpufreq_frequency_table_verify(policy, pxa3xx_freqs_table); | |
157 | } | |
158 | ||
159 | static unsigned int pxa3xx_cpufreq_get(unsigned int cpu) | |
160 | { | |
161 | return get_clk_frequency_khz(0); | |
162 | } | |
163 | ||
164 | static int pxa3xx_cpufreq_set(struct cpufreq_policy *policy, | |
165 | unsigned int target_freq, | |
166 | unsigned int relation) | |
167 | { | |
168 | struct pxa3xx_freq_info *next; | |
169 | struct cpufreq_freqs freqs; | |
170 | unsigned long flags; | |
171 | int idx; | |
172 | ||
173 | if (policy->cpu != 0) | |
174 | return -EINVAL; | |
175 | ||
176 | /* Lookup the next frequency */ | |
177 | if (cpufreq_frequency_table_target(policy, pxa3xx_freqs_table, | |
178 | target_freq, relation, &idx)) | |
179 | return -EINVAL; | |
180 | ||
181 | next = &pxa3xx_freqs[idx]; | |
182 | ||
183 | freqs.old = policy->cur; | |
184 | freqs.new = next->cpufreq_mhz * 1000; | |
185 | freqs.cpu = policy->cpu; | |
186 | ||
187 | pr_debug("CPU frequency from %d MHz to %d MHz%s\n", | |
188 | freqs.old / 1000, freqs.new / 1000, | |
189 | (freqs.old == freqs.new) ? " (skipped)" : ""); | |
190 | ||
191 | if (freqs.old == target_freq) | |
192 | return 0; | |
193 | ||
194 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); | |
195 | ||
196 | local_irq_save(flags); | |
197 | __update_core_freq(next); | |
198 | __update_bus_freq(next); | |
199 | local_irq_restore(flags); | |
200 | ||
201 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
206 | static __init int pxa3xx_cpufreq_init(struct cpufreq_policy *policy) | |
207 | { | |
208 | int ret = -EINVAL; | |
209 | ||
210 | /* set default policy and cpuinfo */ | |
4f788bb2 EM |
211 | policy->cpuinfo.min_freq = 104000; |
212 | policy->cpuinfo.max_freq = (cpu_is_pxa320()) ? 806000 : 624000; | |
213 | policy->cpuinfo.transition_latency = 1000; /* FIXME: 1 ms, assumed */ | |
214 | policy->cur = policy->min = policy->max = get_clk_frequency_khz(0); | |
215 | ||
216 | if (cpu_is_pxa300() || cpu_is_pxa310()) | |
217 | ret = setup_freqs_table(policy, ARRAY_AND_SIZE(pxa300_freqs)); | |
218 | ||
219 | if (cpu_is_pxa320()) | |
220 | ret = setup_freqs_table(policy, ARRAY_AND_SIZE(pxa320_freqs)); | |
221 | ||
222 | if (ret) { | |
223 | pr_err("failed to setup frequency table\n"); | |
224 | return ret; | |
225 | } | |
226 | ||
227 | pr_info("CPUFREQ support for PXA3xx initialized\n"); | |
228 | return 0; | |
229 | } | |
230 | ||
231 | static struct cpufreq_driver pxa3xx_cpufreq_driver = { | |
232 | .verify = pxa3xx_cpufreq_verify, | |
233 | .target = pxa3xx_cpufreq_set, | |
234 | .init = pxa3xx_cpufreq_init, | |
235 | .get = pxa3xx_cpufreq_get, | |
236 | .name = "pxa3xx-cpufreq", | |
237 | }; | |
238 | ||
239 | static int __init cpufreq_init(void) | |
240 | { | |
241 | if (cpu_is_pxa3xx()) | |
242 | return cpufreq_register_driver(&pxa3xx_cpufreq_driver); | |
243 | ||
244 | return 0; | |
245 | } | |
246 | module_init(cpufreq_init); | |
247 | ||
248 | static void __exit cpufreq_exit(void) | |
249 | { | |
250 | cpufreq_unregister_driver(&pxa3xx_cpufreq_driver); | |
251 | } | |
252 | module_exit(cpufreq_exit); | |
253 | ||
254 | MODULE_DESCRIPTION("CPU frequency scaling driver for PXA3xx"); | |
255 | MODULE_LICENSE("GPL"); |