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dc98e414 | 1 | /* arch/arm/plat-samsung/include/plat/cpu-freq-core.h |
2e4ea6e8 | 2 | * |
ccae941e | 3 | * Copyright (c) 2006-2009 Simtec Electronics |
2e4ea6e8 BD |
4 | * http://armlinux.simtec.co.uk/ |
5 | * Ben Dooks <ben@simtec.co.uk> | |
6 | * | |
7 | * S3C CPU frequency scaling support - core support | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <plat/cpu-freq.h> | |
15 | ||
e6d197a6 BD |
16 | struct seq_file; |
17 | ||
2e4ea6e8 BD |
18 | #define MAX_BANKS (8) |
19 | #define S3C2412_MAX_IO (8) | |
20 | ||
21 | /** | |
22 | * struct s3c2410_iobank_timing - IO bank timings for S3C2410 style timings | |
23 | * @bankcon: The cached version of settings in this structure. | |
24 | * @tacp: | |
25 | * @tacs: Time from address valid to nCS asserted. | |
26 | * @tcos: Time from nCS asserted to nOE or nWE asserted. | |
27 | * @tacc: Time that nOE or nWE is asserted. | |
28 | * @tcoh: Time nCS is held after nOE or nWE are released. | |
29 | * @tcah: Time address is held for after | |
30 | * @nwait_en: Whether nWAIT is enabled for this bank. | |
31 | * | |
32 | * This structure represents the IO timings for a S3C2410 style IO bank | |
33 | * used by the CPU frequency support if it needs to change the settings | |
34 | * of the IO. | |
35 | */ | |
36 | struct s3c2410_iobank_timing { | |
37 | unsigned long bankcon; | |
38 | unsigned int tacp; | |
39 | unsigned int tacs; | |
40 | unsigned int tcos; | |
41 | unsigned int tacc; | |
42 | unsigned int tcoh; /* nCS hold afrer nOE/nWE */ | |
43 | unsigned int tcah; /* Address hold after nCS */ | |
44 | unsigned char nwait_en; /* nWait enabled for bank. */ | |
45 | }; | |
46 | ||
140780ab BD |
47 | /** |
48 | * struct s3c2412_iobank_timing - io timings for PL092 (S3C2412) style IO | |
49 | * @idcy: The idle cycle time between transactions. | |
50 | * @wstrd: nCS release to end of read cycle. | |
51 | * @wstwr: nCS release to end of write cycle. | |
52 | * @wstoen: nCS assertion to nOE assertion time. | |
53 | * @wstwen: nCS assertion to nWE assertion time. | |
54 | * @wstbrd: Burst ready delay. | |
55 | * @smbidcyr: Register cache for smbidcyr value. | |
56 | * @smbwstrd: Register cache for smbwstrd value. | |
57 | * @smbwstwr: Register cache for smbwstwr value. | |
58 | * @smbwstoen: Register cache for smbwstoen value. | |
59 | * @smbwstwen: Register cache for smbwstwen value. | |
60 | * @smbwstbrd: Register cache for smbwstbrd value. | |
61 | * | |
62 | * Timing information for a IO bank on an S3C2412 or similar system which | |
63 | * uses a PL093 block. | |
64 | */ | |
65 | struct s3c2412_iobank_timing { | |
66 | unsigned int idcy; | |
67 | unsigned int wstrd; | |
68 | unsigned int wstwr; | |
69 | unsigned int wstoen; | |
70 | unsigned int wstwen; | |
71 | unsigned int wstbrd; | |
72 | ||
73 | /* register cache */ | |
74 | unsigned char smbidcyr; | |
75 | unsigned char smbwstrd; | |
76 | unsigned char smbwstwr; | |
77 | unsigned char smbwstoen; | |
78 | unsigned char smbwstwen; | |
79 | unsigned char smbwstbrd; | |
80 | }; | |
81 | ||
2e4ea6e8 | 82 | union s3c_iobank { |
140780ab BD |
83 | struct s3c2410_iobank_timing *io_2410; |
84 | struct s3c2412_iobank_timing *io_2412; | |
2e4ea6e8 BD |
85 | }; |
86 | ||
87 | /** | |
88 | * struct s3c_iotimings - Chip IO timings holder | |
89 | * @bank: The timings for each IO bank. | |
90 | */ | |
91 | struct s3c_iotimings { | |
92 | union s3c_iobank bank[MAX_BANKS]; | |
93 | }; | |
94 | ||
95 | /** | |
96 | * struct s3c_plltab - PLL table information. | |
97 | * @vals: List of PLL values. | |
98 | * @size: Size of the PLL table @vals. | |
99 | */ | |
100 | struct s3c_plltab { | |
101 | struct s3c_pllval *vals; | |
102 | int size; | |
103 | }; | |
104 | ||
d6fc87d3 BD |
105 | /** |
106 | * struct s3c_cpufreq_config - current cpu frequency configuration | |
107 | * @freq: The current settings for the core clocks. | |
108 | * @max: Maxium settings, derived from core, board and user settings. | |
109 | * @pll: The PLL table entry for the current PLL settings. | |
110 | * @divs: The divisor settings for the core clocks. | |
111 | * @info: The current core driver information. | |
112 | * @board: The information for the board we are running on. | |
113 | * @lock_pll: Set if the PLL settings cannot be changed. | |
114 | * | |
115 | * This is for the core drivers that need to know information about | |
116 | * the current settings and values. It should not be needed by any | |
117 | * device drivers. | |
118 | */ | |
119 | struct s3c_cpufreq_config { | |
120 | struct s3c_freq freq; | |
121 | struct s3c_freq max; | |
122 | struct cpufreq_frequency_table pll; | |
123 | struct s3c_clkdivs divs; | |
124 | struct s3c_cpufreq_info *info; /* for core, not drivers */ | |
125 | struct s3c_cpufreq_board *board; | |
126 | ||
127 | unsigned int lock_pll:1; | |
128 | }; | |
129 | ||
2e4ea6e8 BD |
130 | /** |
131 | * struct s3c_cpufreq_info - Information for the CPU frequency driver. | |
132 | * @name: The name of this implementation. | |
133 | * @max: The maximum frequencies for the system. | |
134 | * @latency: Transition latency to give to cpufreq. | |
135 | * @locktime_m: The lock-time in uS for the MPLL. | |
136 | * @locktime_u: The lock-time in uS for the UPLL. | |
137 | * @locttime_bits: The number of bits each LOCKTIME field. | |
3ad2f3fb | 138 | * @need_pll: Set if this driver needs to change the PLL values to achieve |
2e4ea6e8 BD |
139 | * any frequency changes. This is really only need by devices like the |
140 | * S3C2410 where there is no or limited divider between the PLL and the | |
141 | * ARMCLK. | |
142 | * @resume_clocks: Update the clocks on resume. | |
143 | * @get_iotiming: Get the current IO timing data, mainly for use at start. | |
144 | * @set_iotiming: Update the IO timings from the cached copies calculated | |
145 | * from the @calc_iotiming entry when changing the frequency. | |
146 | * @calc_iotiming: Calculate and update the cached copies of the IO timings | |
147 | * from the newly calculated frequencies. | |
148 | * @calc_freqtable: Calculate (fill in) the given frequency table from the | |
149 | * current frequency configuration. If the table passed in is NULL, | |
150 | * then the return is the number of elements to be filled for allocation | |
151 | * of the table. | |
152 | * @set_refresh: Set the memory refresh configuration. | |
153 | * @set_fvco: Set the PLL frequencies. | |
154 | * @set_divs: Update the clock divisors. | |
155 | * @calc_divs: Calculate the clock divisors. | |
156 | */ | |
157 | struct s3c_cpufreq_info { | |
158 | const char *name; | |
159 | struct s3c_freq max; | |
160 | ||
161 | unsigned int latency; | |
162 | ||
163 | unsigned int locktime_m; | |
164 | unsigned int locktime_u; | |
165 | unsigned char locktime_bits; | |
166 | ||
167 | unsigned int need_pll:1; | |
168 | ||
169 | /* driver routines */ | |
170 | ||
171 | void (*resume_clocks)(void); | |
172 | ||
173 | int (*get_iotiming)(struct s3c_cpufreq_config *cfg, | |
174 | struct s3c_iotimings *timings); | |
175 | ||
176 | void (*set_iotiming)(struct s3c_cpufreq_config *cfg, | |
177 | struct s3c_iotimings *timings); | |
178 | ||
179 | int (*calc_iotiming)(struct s3c_cpufreq_config *cfg, | |
180 | struct s3c_iotimings *timings); | |
181 | ||
182 | int (*calc_freqtable)(struct s3c_cpufreq_config *cfg, | |
183 | struct cpufreq_frequency_table *t, | |
184 | size_t table_size); | |
185 | ||
e6d197a6 BD |
186 | void (*debug_io_show)(struct seq_file *seq, |
187 | struct s3c_cpufreq_config *cfg, | |
188 | union s3c_iobank *iob); | |
189 | ||
2e4ea6e8 BD |
190 | void (*set_refresh)(struct s3c_cpufreq_config *cfg); |
191 | void (*set_fvco)(struct s3c_cpufreq_config *cfg); | |
192 | void (*set_divs)(struct s3c_cpufreq_config *cfg); | |
193 | int (*calc_divs)(struct s3c_cpufreq_config *cfg); | |
194 | }; | |
195 | ||
196 | extern int s3c_cpufreq_register(struct s3c_cpufreq_info *info); | |
197 | ||
dc98e414 KK |
198 | extern int s3c_plltab_register(struct cpufreq_frequency_table *plls, |
199 | unsigned int plls_no); | |
2e4ea6e8 | 200 | |
e6d197a6 BD |
201 | /* exports and utilities for debugfs */ |
202 | extern struct s3c_cpufreq_config *s3c_cpufreq_getconfig(void); | |
203 | extern struct s3c_iotimings *s3c_cpufreq_getiotimings(void); | |
204 | ||
205 | extern void s3c2410_iotiming_debugfs(struct seq_file *seq, | |
206 | struct s3c_cpufreq_config *cfg, | |
207 | union s3c_iobank *iob); | |
208 | ||
209 | extern void s3c2412_iotiming_debugfs(struct seq_file *seq, | |
210 | struct s3c_cpufreq_config *cfg, | |
211 | union s3c_iobank *iob); | |
212 | ||
213 | #ifdef CONFIG_CPU_FREQ_S3C24XX_DEBUGFS | |
214 | #define s3c_cpufreq_debugfs_call(x) x | |
215 | #else | |
216 | #define s3c_cpufreq_debugfs_call(x) NULL | |
217 | #endif | |
218 | ||
2e4ea6e8 BD |
219 | /* Useful utility functions. */ |
220 | ||
221 | extern struct clk *s3c_cpufreq_clk_get(struct device *, const char *); | |
222 | ||
223 | /* S3C2410 and compatible exported functions */ | |
224 | ||
225 | extern void s3c2410_cpufreq_setrefresh(struct s3c_cpufreq_config *cfg); | |
2e31de65 | 226 | extern void s3c2410_set_fvco(struct s3c_cpufreq_config *cfg); |
2e4ea6e8 | 227 | |
2e31de65 | 228 | #ifdef CONFIG_S3C2410_IOTIMING |
2e4ea6e8 BD |
229 | extern int s3c2410_iotiming_calc(struct s3c_cpufreq_config *cfg, |
230 | struct s3c_iotimings *iot); | |
231 | ||
232 | extern int s3c2410_iotiming_get(struct s3c_cpufreq_config *cfg, | |
233 | struct s3c_iotimings *timings); | |
234 | ||
235 | extern void s3c2410_iotiming_set(struct s3c_cpufreq_config *cfg, | |
236 | struct s3c_iotimings *iot); | |
2e31de65 BD |
237 | #else |
238 | #define s3c2410_iotiming_calc NULL | |
239 | #define s3c2410_iotiming_get NULL | |
240 | #define s3c2410_iotiming_set NULL | |
241 | #endif /* CONFIG_S3C2410_IOTIMING */ | |
2e4ea6e8 | 242 | |
140780ab BD |
243 | /* S3C2412 compatible routines */ |
244 | ||
245 | extern int s3c2412_iotiming_get(struct s3c_cpufreq_config *cfg, | |
246 | struct s3c_iotimings *timings); | |
247 | ||
248 | extern int s3c2412_iotiming_get(struct s3c_cpufreq_config *cfg, | |
249 | struct s3c_iotimings *timings); | |
250 | ||
251 | extern int s3c2412_iotiming_calc(struct s3c_cpufreq_config *cfg, | |
252 | struct s3c_iotimings *iot); | |
253 | ||
254 | extern void s3c2412_iotiming_set(struct s3c_cpufreq_config *cfg, | |
255 | struct s3c_iotimings *iot); | |
256 | ||
2e4ea6e8 BD |
257 | #ifdef CONFIG_CPU_FREQ_S3C24XX_DEBUG |
258 | #define s3c_freq_dbg(x...) printk(KERN_INFO x) | |
259 | #else | |
260 | #define s3c_freq_dbg(x...) do { if (0) printk(x); } while (0) | |
261 | #endif /* CONFIG_CPU_FREQ_S3C24XX_DEBUG */ | |
262 | ||
263 | #ifdef CONFIG_CPU_FREQ_S3C24XX_IODEBUG | |
264 | #define s3c_freq_iodbg(x...) printk(KERN_INFO x) | |
265 | #else | |
266 | #define s3c_freq_iodbg(x...) do { if (0) printk(x); } while (0) | |
267 | #endif /* CONFIG_CPU_FREQ_S3C24XX_IODEBUG */ | |
268 | ||
269 | static inline int s3c_cpufreq_addfreq(struct cpufreq_frequency_table *table, | |
270 | int index, size_t table_size, | |
271 | unsigned int freq) | |
272 | { | |
273 | if (index < 0) | |
274 | return index; | |
275 | ||
276 | if (table) { | |
277 | if (index >= table_size) | |
278 | return -ENOMEM; | |
279 | ||
280 | s3c_freq_dbg("%s: { %d = %u kHz }\n", | |
281 | __func__, index, freq); | |
282 | ||
283 | table[index].index = index; | |
284 | table[index].frequency = freq; | |
285 | } | |
286 | ||
287 | return index + 1; | |
288 | } |