/* * linux/arch/arm/mach-omap2/clock.c * * Copyright (C) 2005-2008 Texas Instruments, Inc. * Copyright (C) 2004-2010 Nokia Corporation * * Contacts: * Richard Woodruff * Paul Walmsley * * 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. */ #undef DEBUG #include #include #include #include #include #include #include #include #include #include #include #include #include #include "soc.h" #include "clockdomain.h" #include "clock.h" #include "cm.h" #include "cm2xxx.h" #include "cm3xxx.h" #include "cm-regbits-24xx.h" #include "cm-regbits-34xx.h" #include "common.h" u16 cpu_mask; /* DPLL valid Fint frequency band limits - from 34xx TRM Section 4.7.6.2 */ #define OMAP3430_DPLL_FINT_BAND1_MIN 750000 #define OMAP3430_DPLL_FINT_BAND1_MAX 2100000 #define OMAP3430_DPLL_FINT_BAND2_MIN 7500000 #define OMAP3430_DPLL_FINT_BAND2_MAX 21000000 /* * DPLL valid Fint frequency range for OMAP36xx and OMAP4xxx. * From device data manual section 4.3 "DPLL and DLL Specifications". */ #define OMAP3PLUS_DPLL_FINT_MIN 32000 #define OMAP3PLUS_DPLL_FINT_MAX 52000000 static struct ti_clk_ll_ops omap_clk_ll_ops = { .clkdm_clk_enable = clkdm_clk_enable, .clkdm_clk_disable = clkdm_clk_disable, .cm_wait_module_ready = omap_cm_wait_module_ready, .cm_split_idlest_reg = cm_split_idlest_reg, }; /** * omap2_clk_setup_ll_ops - setup clock driver low-level ops * * Sets up clock driver low-level platform ops. These are needed * for register accesses and various other misc platform operations. * Returns 0 on success, -EBUSY if low level ops have been registered * already. */ int __init omap2_clk_setup_ll_ops(void) { return ti_clk_setup_ll_ops(&omap_clk_ll_ops); } /* * OMAP2+ specific clock functions */ /* Private functions */ /* Public functions */ /** * omap2_init_clk_clkdm - look up a clockdomain name, store pointer in clk * @clk: OMAP clock struct ptr to use * * Convert a clockdomain name stored in a struct clk 'clk' into a * clockdomain pointer, and save it into the struct clk. Intended to be * called during clk_register(). No return value. */ void omap2_init_clk_clkdm(struct clk_hw *hw) { struct clk_hw_omap *clk = to_clk_hw_omap(hw); struct clockdomain *clkdm; const char *clk_name; if (!clk->clkdm_name) return; clk_name = __clk_get_name(hw->clk); clkdm = clkdm_lookup(clk->clkdm_name); if (clkdm) { pr_debug("clock: associated clk %s to clkdm %s\n", clk_name, clk->clkdm_name); clk->clkdm = clkdm; } else { pr_debug("clock: could not associate clk %s to clkdm %s\n", clk_name, clk->clkdm_name); } } static int __initdata mpurate; /* * By default we use the rate set by the bootloader. * You can override this with mpurate= cmdline option. */ static int __init omap_clk_setup(char *str) { get_option(&str, &mpurate); if (!mpurate) return 1; if (mpurate < 1000) mpurate *= 1000000; return 1; } __setup("mpurate=", omap_clk_setup); /** * omap2_clk_print_new_rates - print summary of current clock tree rates * @hfclkin_ck_name: clk name for the off-chip HF oscillator * @core_ck_name: clk name for the on-chip CORE_CLK * @mpu_ck_name: clk name for the ARM MPU clock * * Prints a short message to the console with the HFCLKIN oscillator * rate, the rate of the CORE clock, and the rate of the ARM MPU clock. * Called by the boot-time MPU rate switching code. XXX This is intended * to be handled by the OPP layer code in the near future and should be * removed from the clock code. No return value. */ void __init omap2_clk_print_new_rates(const char *hfclkin_ck_name, const char *core_ck_name, const char *mpu_ck_name) { struct clk *hfclkin_ck, *core_ck, *mpu_ck; unsigned long hfclkin_rate; mpu_ck = clk_get(NULL, mpu_ck_name); if (WARN(IS_ERR(mpu_ck), "clock: failed to get %s.\n", mpu_ck_name)) return; core_ck = clk_get(NULL, core_ck_name); if (WARN(IS_ERR(core_ck), "clock: failed to get %s.\n", core_ck_name)) return; hfclkin_ck = clk_get(NULL, hfclkin_ck_name); if (WARN(IS_ERR(hfclkin_ck), "Failed to get %s.\n", hfclkin_ck_name)) return; hfclkin_rate = clk_get_rate(hfclkin_ck); pr_info("Switched to new clocking rate (Crystal/Core/MPU): %ld.%01ld/%ld/%ld MHz\n", (hfclkin_rate / 1000000), ((hfclkin_rate / 100000) % 10), (clk_get_rate(core_ck) / 1000000), (clk_get_rate(mpu_ck) / 1000000)); } /** * ti_clk_init_features - init clock features struct for the SoC * * Initializes the clock features struct based on the SoC type. */ void __init ti_clk_init_features(void) { struct ti_clk_features features = { 0 }; /* Fint setup for DPLLs */ if (cpu_is_omap3430()) { features.fint_min = OMAP3430_DPLL_FINT_BAND1_MIN; features.fint_max = OMAP3430_DPLL_FINT_BAND2_MAX; features.fint_band1_max = OMAP3430_DPLL_FINT_BAND1_MAX; features.fint_band2_min = OMAP3430_DPLL_FINT_BAND2_MIN; } else { features.fint_min = OMAP3PLUS_DPLL_FINT_MIN; features.fint_max = OMAP3PLUS_DPLL_FINT_MAX; } /* Bypass value setup for DPLLs */ if (cpu_is_omap24xx()) { features.dpll_bypass_vals |= (1 << OMAP2XXX_EN_DPLL_LPBYPASS) | (1 << OMAP2XXX_EN_DPLL_FRBYPASS); } else if (cpu_is_omap34xx()) { features.dpll_bypass_vals |= (1 << OMAP3XXX_EN_DPLL_LPBYPASS) | (1 << OMAP3XXX_EN_DPLL_FRBYPASS); } else if (soc_is_am33xx() || cpu_is_omap44xx() || soc_is_am43xx() || soc_is_omap54xx() || soc_is_dra7xx()) { features.dpll_bypass_vals |= (1 << OMAP4XXX_EN_DPLL_LPBYPASS) | (1 << OMAP4XXX_EN_DPLL_FRBYPASS) | (1 << OMAP4XXX_EN_DPLL_MNBYPASS); } /* Jitter correction only available on OMAP343X */ if (cpu_is_omap343x()) features.flags |= TI_CLK_DPLL_HAS_FREQSEL; /* Idlest value for interface clocks. * 24xx uses 0 to indicate not ready, and 1 to indicate ready. * 34xx reverses this, just to keep us on our toes * AM35xx uses both, depending on the module. */ if (cpu_is_omap24xx()) features.cm_idlest_val = OMAP24XX_CM_IDLEST_VAL; else if (cpu_is_omap34xx()) features.cm_idlest_val = OMAP34XX_CM_IDLEST_VAL; /* On OMAP3430 ES1.0, DPLL4 can't be re-programmed */ if (omap_rev() == OMAP3430_REV_ES1_0) features.flags |= TI_CLK_DPLL4_DENY_REPROGRAM; /* Errata I810 for omap5 / dra7 */ if (soc_is_omap54xx() || soc_is_dra7xx()) features.flags |= TI_CLK_ERRATA_I810; ti_clk_setup_features(&features); }