cpu-freq-core.h

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/* arch/arm/plat-samsung/include/plat/cpu-freq-core.h
 *
 * Copyright (c) 2006-2009 Simtec Electronics
 *  http://armlinux.simtec.co.uk/
 *  Ben Dooks <[email protected]>
 *
 * S3C CPU frequency scaling support - core support
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
*/

#include <plat/cpu-freq.h>

struct seq_file;

#define MAX_BANKS (8)
#define S3C2412_MAX_IO  (8)

struct s3c2410_iobank_timing {
    unsigned long   bankcon;
    unsigned int    tacp;
    unsigned int    tacs;
    unsigned int    tcos;
    unsigned int    tacc;
    unsigned int    tcoh;       /* nCS hold afrer nOE/nWE */
    unsigned int    tcah;       /* Address hold after nCS */
    unsigned char   nwait_en;   /* nWait enabled for bank. */
};

struct s3c2412_iobank_timing {
    unsigned int    idcy;
    unsigned int    wstrd;
    unsigned int    wstwr;
    unsigned int    wstoen;
    unsigned int    wstwen;
    unsigned int    wstbrd;

    /* register cache */
    unsigned char   smbidcyr;
    unsigned char   smbwstrd;
    unsigned char   smbwstwr;
    unsigned char   smbwstoen;
    unsigned char   smbwstwen;
    unsigned char   smbwstbrd;
};

union s3c_iobank {
    struct s3c2410_iobank_timing    *io_2410;
    struct s3c2412_iobank_timing    *io_2412;
};

struct s3c_iotimings {
    union s3c_iobank    bank[MAX_BANKS];
};

struct s3c_plltab {
    struct s3c_pllval   *vals;
    int          size;
};

struct s3c_cpufreq_config {
    struct s3c_freq     freq;
    struct s3c_freq     max;
    struct cpufreq_frequency_table pll;
    struct s3c_clkdivs  divs;
    struct s3c_cpufreq_info *info;  /* for core, not drivers */
    struct s3c_cpufreq_board *board;

    unsigned int    lock_pll:1;
};

struct s3c_cpufreq_info {
    const char      *name;
    struct s3c_freq     max;

    unsigned int        latency;

    unsigned int        locktime_m;
    unsigned int        locktime_u;
    unsigned char       locktime_bits;

    unsigned int        need_pll:1;

    /* driver routines */

    void        (*resume_clocks)(void);

    int     (*get_iotiming)(struct s3c_cpufreq_config *cfg,
                    struct s3c_iotimings *timings);

    void        (*set_iotiming)(struct s3c_cpufreq_config *cfg,
                    struct s3c_iotimings *timings);

    int     (*calc_iotiming)(struct s3c_cpufreq_config *cfg,
                     struct s3c_iotimings *timings);

    int     (*calc_freqtable)(struct s3c_cpufreq_config *cfg,
                      struct cpufreq_frequency_table *t,
                      size_t table_size);

    void        (*debug_io_show)(struct seq_file *seq,
                     struct s3c_cpufreq_config *cfg,
                     union s3c_iobank *iob);

    void        (*set_refresh)(struct s3c_cpufreq_config *cfg);
    void        (*set_fvco)(struct s3c_cpufreq_config *cfg);
    void        (*set_divs)(struct s3c_cpufreq_config *cfg);
    int     (*calc_divs)(struct s3c_cpufreq_config *cfg);
};

extern int s3c_cpufreq_register(struct s3c_cpufreq_info *info);

extern int s3c_plltab_register(struct cpufreq_frequency_table *plls,
                   unsigned int plls_no);

/* exports and utilities for debugfs */
extern struct s3c_cpufreq_config *s3c_cpufreq_getconfig(void);
extern struct s3c_iotimings *s3c_cpufreq_getiotimings(void);

#ifdef CONFIG_CPU_FREQ_S3C24XX_DEBUGFS
#define s3c_cpufreq_debugfs_call(x) x
#else
#define s3c_cpufreq_debugfs_call(x) NULL
#endif

/* Useful utility functions. */

extern struct clk *s3c_cpufreq_clk_get(struct device *, const char *);

/* S3C2410 and compatible exported functions */

extern void s3c2410_cpufreq_setrefresh(struct s3c_cpufreq_config *cfg);
extern void s3c2410_set_fvco(struct s3c_cpufreq_config *cfg);

#ifdef CONFIG_S3C2410_IOTIMING
extern void s3c2410_iotiming_debugfs(struct seq_file *seq,
                     struct s3c_cpufreq_config *cfg,
                     union s3c_iobank *iob);

extern int s3c2410_iotiming_calc(struct s3c_cpufreq_config *cfg,
                 struct s3c_iotimings *iot);

extern int s3c2410_iotiming_get(struct s3c_cpufreq_config *cfg,
                struct s3c_iotimings *timings);

extern void s3c2410_iotiming_set(struct s3c_cpufreq_config *cfg,
                 struct s3c_iotimings *iot);
#else
#define s3c2410_iotiming_debugfs NULL
#define s3c2410_iotiming_calc NULL
#define s3c2410_iotiming_get NULL
#define s3c2410_iotiming_set NULL
#endif /* CONFIG_S3C2410_IOTIMING */

/* S3C2412 compatible routines */

#ifdef CONFIG_S3C2412_IOTIMING
extern void s3c2412_iotiming_debugfs(struct seq_file *seq,
                     struct s3c_cpufreq_config *cfg,
                     union s3c_iobank *iob);

extern int s3c2412_iotiming_get(struct s3c_cpufreq_config *cfg,
                struct s3c_iotimings *timings);

extern int s3c2412_iotiming_calc(struct s3c_cpufreq_config *cfg,
                 struct s3c_iotimings *iot);

extern void s3c2412_iotiming_set(struct s3c_cpufreq_config *cfg,
                 struct s3c_iotimings *iot);
#else
#define s3c2412_iotiming_debugfs NULL
#define s3c2412_iotiming_calc NULL
#define s3c2412_iotiming_get NULL
#define s3c2412_iotiming_set NULL
#endif /* CONFIG_S3C2412_IOTIMING */

#ifdef CONFIG_CPU_FREQ_S3C24XX_DEBUG
#define s3c_freq_dbg(x...) printk(KERN_INFO x)
#else
#define s3c_freq_dbg(x...) do { if (0) printk(x); } while (0)
#endif /* CONFIG_CPU_FREQ_S3C24XX_DEBUG */

#ifdef CONFIG_CPU_FREQ_S3C24XX_IODEBUG
#define s3c_freq_iodbg(x...) printk(KERN_INFO x)
#else
#define s3c_freq_iodbg(x...) do { if (0) printk(x); } while (0)
#endif /* CONFIG_CPU_FREQ_S3C24XX_IODEBUG */

static inline int s3c_cpufreq_addfreq(struct cpufreq_frequency_table *table,
                      int index, size_t table_size,
                      unsigned int freq)
{
    if (index < 0)
        return index;

    if (table) {
        if (index >= table_size)
            return -ENOMEM;

        s3c_freq_dbg("%s: { %d = %u kHz }\n",
                 __func__, index, freq);

        table[index].index = index;
        table[index].frequency = freq;
    }

    return index + 1;
}