| /* arch/arm/plat-s3c/include/plat/cpu-freq.h |
| * |
| * Copyright (c) 2006,2007,2009 Simtec Electronics |
| * http://armlinux.simtec.co.uk/ |
| * Ben Dooks <ben@simtec.co.uk> |
| * |
| * 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 - IO bank timings for S3C2410 style timings |
| * @bankcon: The cached version of settings in this structure. |
| * @tacp: |
| * @tacs: Time from address valid to nCS asserted. |
| * @tcos: Time from nCS asserted to nOE or nWE asserted. |
| * @tacc: Time that nOE or nWE is asserted. |
| * @tcoh: Time nCS is held after nOE or nWE are released. |
| * @tcah: Time address is held for after |
| * @nwait_en: Whether nWAIT is enabled for this bank. |
| * |
| * This structure represents the IO timings for a S3C2410 style IO bank |
| * used by the CPU frequency support if it needs to change the settings |
| * of the IO. |
| */ |
| 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 - io timings for PL092 (S3C2412) style IO |
| * @idcy: The idle cycle time between transactions. |
| * @wstrd: nCS release to end of read cycle. |
| * @wstwr: nCS release to end of write cycle. |
| * @wstoen: nCS assertion to nOE assertion time. |
| * @wstwen: nCS assertion to nWE assertion time. |
| * @wstbrd: Burst ready delay. |
| * @smbidcyr: Register cache for smbidcyr value. |
| * @smbwstrd: Register cache for smbwstrd value. |
| * @smbwstwr: Register cache for smbwstwr value. |
| * @smbwstoen: Register cache for smbwstoen value. |
| * @smbwstwen: Register cache for smbwstwen value. |
| * @smbwstbrd: Register cache for smbwstbrd value. |
| * |
| * Timing information for a IO bank on an S3C2412 or similar system which |
| * uses a PL093 block. |
| */ |
| 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 - Chip IO timings holder |
| * @bank: The timings for each IO bank. |
| */ |
| struct s3c_iotimings { |
| union s3c_iobank bank[MAX_BANKS]; |
| }; |
| |
| /** |
| * struct s3c_plltab - PLL table information. |
| * @vals: List of PLL values. |
| * @size: Size of the PLL table @vals. |
| */ |
| struct s3c_plltab { |
| struct s3c_pllval *vals; |
| int size; |
| }; |
| |
| /** |
| * struct s3c_cpufreq_config - current cpu frequency configuration |
| * @freq: The current settings for the core clocks. |
| * @max: Maxium settings, derived from core, board and user settings. |
| * @pll: The PLL table entry for the current PLL settings. |
| * @divs: The divisor settings for the core clocks. |
| * @info: The current core driver information. |
| * @board: The information for the board we are running on. |
| * @lock_pll: Set if the PLL settings cannot be changed. |
| * |
| * This is for the core drivers that need to know information about |
| * the current settings and values. It should not be needed by any |
| * device drivers. |
| */ |
| 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 - Information for the CPU frequency driver. |
| * @name: The name of this implementation. |
| * @max: The maximum frequencies for the system. |
| * @latency: Transition latency to give to cpufreq. |
| * @locktime_m: The lock-time in uS for the MPLL. |
| * @locktime_u: The lock-time in uS for the UPLL. |
| * @locttime_bits: The number of bits each LOCKTIME field. |
| * @need_pll: Set if this driver needs to change the PLL values to acheive |
| * any frequency changes. This is really only need by devices like the |
| * S3C2410 where there is no or limited divider between the PLL and the |
| * ARMCLK. |
| * @resume_clocks: Update the clocks on resume. |
| * @get_iotiming: Get the current IO timing data, mainly for use at start. |
| * @set_iotiming: Update the IO timings from the cached copies calculated |
| * from the @calc_iotiming entry when changing the frequency. |
| * @calc_iotiming: Calculate and update the cached copies of the IO timings |
| * from the newly calculated frequencies. |
| * @calc_freqtable: Calculate (fill in) the given frequency table from the |
| * current frequency configuration. If the table passed in is NULL, |
| * then the return is the number of elements to be filled for allocation |
| * of the table. |
| * @set_refresh: Set the memory refresh configuration. |
| * @set_fvco: Set the PLL frequencies. |
| * @set_divs: Update the clock divisors. |
| * @calc_divs: Calculate the clock divisors. |
| */ |
| 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); |
| |
| extern void s3c2410_iotiming_debugfs(struct seq_file *seq, |
| struct s3c_cpufreq_config *cfg, |
| union s3c_iobank *iob); |
| |
| extern void s3c2412_iotiming_debugfs(struct seq_file *seq, |
| struct s3c_cpufreq_config *cfg, |
| union s3c_iobank *iob); |
| |
| #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 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); |
| |
| extern void s3c2410_set_fvco(struct s3c_cpufreq_config *cfg); |
| |
| /* S3C2412 compatible routines */ |
| |
| extern int s3c2412_iotiming_get(struct s3c_cpufreq_config *cfg, |
| struct s3c_iotimings *timings); |
| |
| 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); |
| |
| #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; |
| } |