arch/arm/plat-samsung/include/plat/cpu-freq-core.h

   1 /* arch/arm/plat-samsung/include/plat/cpu-freq-core.h
   2  *
   3  * Copyright (c) 2006-2009 Simtec Electronics
   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
  16 struct seq_file;
  17
  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 after nOE/nWE */
  43         unsigned int    tcah;           /* Address hold after nCS */
  44         unsigned char   nwait_en;       /* nWait enabled for bank. */
  45 };
  46
  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
  82 union s3c_iobank {
  83         struct s3c2410_iobank_timing    *io_2410;
  84         struct s3c2412_iobank_timing    *io_2412;
  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
 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 clk              *mpll;
 123         struct cpufreq_frequency_table pll;
 124         struct s3c_clkdivs      divs;
 125         struct s3c_cpufreq_info *info;  /* for core, not drivers */
 126         struct s3c_cpufreq_board *board;
 127
 128         unsigned int    lock_pll:1;
 129 };
 130
 131 /**
 132  * struct s3c_cpufreq_info - Information for the CPU frequency driver.
 133  * @name: The name of this implementation.
 134  * @max: The maximum frequencies for the system.
 135  * @latency: Transition latency to give to cpufreq.
 136  * @locktime_m: The lock-time in uS for the MPLL.
 137  * @locktime_u: The lock-time in uS for the UPLL.
 138  * @locttime_bits: The number of bits each LOCKTIME field.
 139  * @need_pll: Set if this driver needs to change the PLL values to achieve
 140  *      any frequency changes. This is really only need by devices like the
 141  *      S3C2410 where there is no or limited divider between the PLL and the
 142  *      ARMCLK.
 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         int             (*get_iotiming)(struct s3c_cpufreq_config *cfg,
 172                                         struct s3c_iotimings *timings);
 173
 174         void            (*set_iotiming)(struct s3c_cpufreq_config *cfg,
 175                                         struct s3c_iotimings *timings);
 176
 177         int             (*calc_iotiming)(struct s3c_cpufreq_config *cfg,
 178                                          struct s3c_iotimings *timings);
 179
 180         int             (*calc_freqtable)(struct s3c_cpufreq_config *cfg,
 181                                           struct cpufreq_frequency_table *t,
 182                                           size_t table_size);
 183
 184         void            (*debug_io_show)(struct seq_file *seq,
 185                                          struct s3c_cpufreq_config *cfg,
 186                                          union s3c_iobank *iob);
 187
 188         void            (*set_refresh)(struct s3c_cpufreq_config *cfg);
 189         void            (*set_fvco)(struct s3c_cpufreq_config *cfg);
 190         void            (*set_divs)(struct s3c_cpufreq_config *cfg);
 191         int             (*calc_divs)(struct s3c_cpufreq_config *cfg);
 192 };
 193
 194 extern int s3c_cpufreq_register(struct s3c_cpufreq_info *info);
 195
 196 extern int s3c_plltab_register(struct cpufreq_frequency_table *plls,
 197                                unsigned int plls_no);
 198
 199 /* exports and utilities for debugfs */
 200 extern struct s3c_cpufreq_config *s3c_cpufreq_getconfig(void);
 201 extern struct s3c_iotimings *s3c_cpufreq_getiotimings(void);
 202
 203 #ifdef CONFIG_ARM_S3C24XX_CPUFREQ_DEBUGFS
 204 #define s3c_cpufreq_debugfs_call(x) x
 205 #else
 206 #define s3c_cpufreq_debugfs_call(x) NULL
 207 #endif
 208
 209 /* Useful utility functions. */
 210
 211 extern struct clk *s3c_cpufreq_clk_get(struct device *, const char *);
 212
 213 /* S3C2410 and compatible exported functions */
 214
 215 extern void s3c2410_cpufreq_setrefresh(struct s3c_cpufreq_config *cfg);
 216 extern void s3c2410_set_fvco(struct s3c_cpufreq_config *cfg);
 217
 218 #ifdef CONFIG_S3C2410_IOTIMING
 219 extern void s3c2410_iotiming_debugfs(struct seq_file *seq,
 220                                      struct s3c_cpufreq_config *cfg,
 221                                      union s3c_iobank *iob);
 222
 223 extern int s3c2410_iotiming_calc(struct s3c_cpufreq_config *cfg,
 224                                  struct s3c_iotimings *iot);
 225
 226 extern int s3c2410_iotiming_get(struct s3c_cpufreq_config *cfg,
 227                                 struct s3c_iotimings *timings);
 228
 229 extern void s3c2410_iotiming_set(struct s3c_cpufreq_config *cfg,
 230                                  struct s3c_iotimings *iot);
 231 #else
 232 #define s3c2410_iotiming_debugfs NULL
 233 #define s3c2410_iotiming_calc NULL
 234 #define s3c2410_iotiming_get NULL
 235 #define s3c2410_iotiming_set NULL
 236 #endif /* CONFIG_S3C2410_IOTIMING */
 237
 238 /* S3C2412 compatible routines */
 239
 240 #ifdef CONFIG_S3C2412_IOTIMING
 241 extern void s3c2412_iotiming_debugfs(struct seq_file *seq,
 242                                      struct s3c_cpufreq_config *cfg,
 243                                      union s3c_iobank *iob);
 244
 245 extern int s3c2412_iotiming_get(struct s3c_cpufreq_config *cfg,
 246                                 struct s3c_iotimings *timings);
 247
 248 extern int s3c2412_iotiming_calc(struct s3c_cpufreq_config *cfg,
 249                                  struct s3c_iotimings *iot);
 250
 251 extern void s3c2412_iotiming_set(struct s3c_cpufreq_config *cfg,
 252                                  struct s3c_iotimings *iot);
 253 #else
 254 #define s3c2412_iotiming_debugfs NULL
 255 #define s3c2412_iotiming_calc NULL
 256 #define s3c2412_iotiming_get NULL
 257 #define s3c2412_iotiming_set NULL
 258 #endif /* CONFIG_S3C2412_IOTIMING */
 259
 260 #ifdef CONFIG_ARM_S3C24XX_CPUFREQ_DEBUG
 261 #define s3c_freq_dbg(x...) printk(KERN_INFO x)
 262 #else
 263 #define s3c_freq_dbg(x...) do { if (0) printk(x); } while (0)
 264 #endif /* CONFIG_ARM_S3C24XX_CPUFREQ_DEBUG */
 265
 266 #ifdef CONFIG_ARM_S3C24XX_CPUFREQ_IODEBUG
 267 #define s3c_freq_iodbg(x...) printk(KERN_INFO x)
 268 #else
 269 #define s3c_freq_iodbg(x...) do { if (0) printk(x); } while (0)
 270 #endif /* CONFIG_ARM_S3C24XX_CPUFREQ_IODEBUG */
 271
 272 static inline int s3c_cpufreq_addfreq(struct cpufreq_frequency_table *table,
 273                                       int index, size_t table_size,
 274                                       unsigned int freq)
 275 {
 276         if (index < 0)
 277                 return index;
 278
 279         if (table) {
 280                 if (index >= table_size)
 281                         return -ENOMEM;
 282
 283                 s3c_freq_dbg("%s: { %d = %u kHz }\n",
 284                              __func__, index, freq);
 285
 286                 table[index].driver_data = index;
 287                 table[index].frequency = freq;
 288         }
 289
 290         return index + 1;
 291 }