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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> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
4f788bb2 | 18 | |
4f788bb2 EM |
19 | #include <mach/pxa3xx-regs.h> |
20 | ||
21 | #include "generic.h" | |
22 | ||
23 | #define HSS_104M (0) | |
24 | #define HSS_156M (1) | |
25 | #define HSS_208M (2) | |
26 | #define HSS_312M (3) | |
27 | ||
28 | #define SMCFS_78M (0) | |
29 | #define SMCFS_104M (2) | |
30 | #define SMCFS_208M (5) | |
31 | ||
32 | #define SFLFS_104M (0) | |
33 | #define SFLFS_156M (1) | |
34 | #define SFLFS_208M (2) | |
35 | #define SFLFS_312M (3) | |
36 | ||
37 | #define XSPCLK_156M (0) | |
38 | #define XSPCLK_NONE (3) | |
39 | ||
40 | #define DMCFS_26M (0) | |
41 | #define DMCFS_260M (3) | |
42 | ||
43 | struct pxa3xx_freq_info { | |
44 | unsigned int cpufreq_mhz; | |
45 | unsigned int core_xl : 5; | |
46 | unsigned int core_xn : 3; | |
47 | unsigned int hss : 2; | |
48 | unsigned int dmcfs : 2; | |
49 | unsigned int smcfs : 3; | |
50 | unsigned int sflfs : 2; | |
51 | unsigned int df_clkdiv : 3; | |
52 | ||
53 | int vcc_core; /* in mV */ | |
54 | int vcc_sram; /* in mV */ | |
55 | }; | |
56 | ||
57 | #define OP(cpufreq, _xl, _xn, _hss, _dmc, _smc, _sfl, _dfi, vcore, vsram) \ | |
58 | { \ | |
59 | .cpufreq_mhz = cpufreq, \ | |
60 | .core_xl = _xl, \ | |
61 | .core_xn = _xn, \ | |
62 | .hss = HSS_##_hss##M, \ | |
63 | .dmcfs = DMCFS_##_dmc##M, \ | |
64 | .smcfs = SMCFS_##_smc##M, \ | |
65 | .sflfs = SFLFS_##_sfl##M, \ | |
66 | .df_clkdiv = _dfi, \ | |
67 | .vcc_core = vcore, \ | |
68 | .vcc_sram = vsram, \ | |
69 | } | |
70 | ||
71 | static struct pxa3xx_freq_info pxa300_freqs[] = { | |
72 | /* CPU XL XN HSS DMEM SMEM SRAM DFI VCC_CORE VCC_SRAM */ | |
73 | OP(104, 8, 1, 104, 260, 78, 104, 3, 1000, 1100), /* 104MHz */ | |
74 | OP(208, 16, 1, 104, 260, 104, 156, 2, 1000, 1100), /* 208MHz */ | |
75 | OP(416, 16, 2, 156, 260, 104, 208, 2, 1100, 1200), /* 416MHz */ | |
76 | OP(624, 24, 2, 208, 260, 208, 312, 3, 1375, 1400), /* 624MHz */ | |
77 | }; | |
78 | ||
79 | static struct pxa3xx_freq_info pxa320_freqs[] = { | |
80 | /* CPU XL XN HSS DMEM SMEM SRAM DFI VCC_CORE VCC_SRAM */ | |
81 | OP(104, 8, 1, 104, 260, 78, 104, 3, 1000, 1100), /* 104MHz */ | |
82 | OP(208, 16, 1, 104, 260, 104, 156, 2, 1000, 1100), /* 208MHz */ | |
83 | OP(416, 16, 2, 156, 260, 104, 208, 2, 1100, 1200), /* 416MHz */ | |
84 | OP(624, 24, 2, 208, 260, 208, 312, 3, 1375, 1400), /* 624MHz */ | |
85 | OP(806, 31, 2, 208, 260, 208, 312, 3, 1400, 1400), /* 806MHz */ | |
86 | }; | |
87 | ||
88 | static unsigned int pxa3xx_freqs_num; | |
89 | static struct pxa3xx_freq_info *pxa3xx_freqs; | |
90 | static struct cpufreq_frequency_table *pxa3xx_freqs_table; | |
91 | ||
92 | static int setup_freqs_table(struct cpufreq_policy *policy, | |
93 | struct pxa3xx_freq_info *freqs, int num) | |
94 | { | |
95 | struct cpufreq_frequency_table *table; | |
96 | int i; | |
97 | ||
98 | table = kzalloc((num + 1) * sizeof(*table), GFP_KERNEL); | |
99 | if (table == NULL) | |
100 | return -ENOMEM; | |
101 | ||
102 | for (i = 0; i < num; i++) { | |
103 | table[i].index = i; | |
104 | table[i].frequency = freqs[i].cpufreq_mhz * 1000; | |
105 | } | |
68a31de3 | 106 | table[num].index = i; |
4f788bb2 EM |
107 | table[num].frequency = CPUFREQ_TABLE_END; |
108 | ||
109 | pxa3xx_freqs = freqs; | |
110 | pxa3xx_freqs_num = num; | |
111 | pxa3xx_freqs_table = table; | |
112 | ||
113 | return cpufreq_frequency_table_cpuinfo(policy, table); | |
114 | } | |
115 | ||
116 | static void __update_core_freq(struct pxa3xx_freq_info *info) | |
117 | { | |
118 | uint32_t mask = ACCR_XN_MASK | ACCR_XL_MASK; | |
119 | uint32_t accr = ACCR; | |
120 | uint32_t xclkcfg; | |
121 | ||
122 | accr &= ~(ACCR_XN_MASK | ACCR_XL_MASK | ACCR_XSPCLK_MASK); | |
123 | accr |= ACCR_XN(info->core_xn) | ACCR_XL(info->core_xl); | |
124 | ||
125 | /* No clock until core PLL is re-locked */ | |
126 | accr |= ACCR_XSPCLK(XSPCLK_NONE); | |
127 | ||
128 | xclkcfg = (info->core_xn == 2) ? 0x3 : 0x2; /* turbo bit */ | |
129 | ||
130 | ACCR = accr; | |
131 | __asm__("mcr p14, 0, %0, c6, c0, 0\n" : : "r"(xclkcfg)); | |
132 | ||
133 | while ((ACSR & mask) != (accr & mask)) | |
134 | cpu_relax(); | |
135 | } | |
136 | ||
137 | static void __update_bus_freq(struct pxa3xx_freq_info *info) | |
138 | { | |
139 | uint32_t mask; | |
140 | uint32_t accr = ACCR; | |
141 | ||
142 | mask = ACCR_SMCFS_MASK | ACCR_SFLFS_MASK | ACCR_HSS_MASK | | |
143 | ACCR_DMCFS_MASK; | |
144 | ||
145 | accr &= ~mask; | |
146 | accr |= ACCR_SMCFS(info->smcfs) | ACCR_SFLFS(info->sflfs) | | |
147 | ACCR_HSS(info->hss) | ACCR_DMCFS(info->dmcfs); | |
148 | ||
149 | ACCR = accr; | |
150 | ||
151 | while ((ACSR & mask) != (accr & mask)) | |
152 | cpu_relax(); | |
153 | } | |
154 | ||
155 | static int pxa3xx_cpufreq_verify(struct cpufreq_policy *policy) | |
156 | { | |
157 | return cpufreq_frequency_table_verify(policy, pxa3xx_freqs_table); | |
158 | } | |
159 | ||
160 | static unsigned int pxa3xx_cpufreq_get(unsigned int cpu) | |
161 | { | |
162 | return get_clk_frequency_khz(0); | |
163 | } | |
164 | ||
165 | static int pxa3xx_cpufreq_set(struct cpufreq_policy *policy, | |
166 | unsigned int target_freq, | |
167 | unsigned int relation) | |
168 | { | |
169 | struct pxa3xx_freq_info *next; | |
170 | struct cpufreq_freqs freqs; | |
171 | unsigned long flags; | |
172 | int idx; | |
173 | ||
174 | if (policy->cpu != 0) | |
175 | return -EINVAL; | |
176 | ||
177 | /* Lookup the next frequency */ | |
178 | if (cpufreq_frequency_table_target(policy, pxa3xx_freqs_table, | |
179 | target_freq, relation, &idx)) | |
180 | return -EINVAL; | |
181 | ||
182 | next = &pxa3xx_freqs[idx]; | |
183 | ||
184 | freqs.old = policy->cur; | |
185 | freqs.new = next->cpufreq_mhz * 1000; | |
186 | freqs.cpu = policy->cpu; | |
187 | ||
188 | pr_debug("CPU frequency from %d MHz to %d MHz%s\n", | |
189 | freqs.old / 1000, freqs.new / 1000, | |
190 | (freqs.old == freqs.new) ? " (skipped)" : ""); | |
191 | ||
192 | if (freqs.old == target_freq) | |
193 | return 0; | |
194 | ||
195 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); | |
196 | ||
197 | local_irq_save(flags); | |
198 | __update_core_freq(next); | |
199 | __update_bus_freq(next); | |
200 | local_irq_restore(flags); | |
201 | ||
202 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
207 | static __init int pxa3xx_cpufreq_init(struct cpufreq_policy *policy) | |
208 | { | |
209 | int ret = -EINVAL; | |
210 | ||
211 | /* set default policy and cpuinfo */ | |
4f788bb2 EM |
212 | policy->cpuinfo.min_freq = 104000; |
213 | policy->cpuinfo.max_freq = (cpu_is_pxa320()) ? 806000 : 624000; | |
214 | policy->cpuinfo.transition_latency = 1000; /* FIXME: 1 ms, assumed */ | |
215 | policy->cur = policy->min = policy->max = get_clk_frequency_khz(0); | |
216 | ||
217 | if (cpu_is_pxa300() || cpu_is_pxa310()) | |
218 | ret = setup_freqs_table(policy, ARRAY_AND_SIZE(pxa300_freqs)); | |
219 | ||
220 | if (cpu_is_pxa320()) | |
221 | ret = setup_freqs_table(policy, ARRAY_AND_SIZE(pxa320_freqs)); | |
222 | ||
223 | if (ret) { | |
224 | pr_err("failed to setup frequency table\n"); | |
225 | return ret; | |
226 | } | |
227 | ||
228 | pr_info("CPUFREQ support for PXA3xx initialized\n"); | |
229 | return 0; | |
230 | } | |
231 | ||
232 | static struct cpufreq_driver pxa3xx_cpufreq_driver = { | |
233 | .verify = pxa3xx_cpufreq_verify, | |
234 | .target = pxa3xx_cpufreq_set, | |
235 | .init = pxa3xx_cpufreq_init, | |
236 | .get = pxa3xx_cpufreq_get, | |
237 | .name = "pxa3xx-cpufreq", | |
238 | }; | |
239 | ||
240 | static int __init cpufreq_init(void) | |
241 | { | |
242 | if (cpu_is_pxa3xx()) | |
243 | return cpufreq_register_driver(&pxa3xx_cpufreq_driver); | |
244 | ||
245 | return 0; | |
246 | } | |
247 | module_init(cpufreq_init); | |
248 | ||
249 | static void __exit cpufreq_exit(void) | |
250 | { | |
251 | cpufreq_unregister_driver(&pxa3xx_cpufreq_driver); | |
252 | } | |
253 | module_exit(cpufreq_exit); | |
254 | ||
255 | MODULE_DESCRIPTION("CPU frequency scaling driver for PXA3xx"); | |
256 | MODULE_LICENSE("GPL"); |