diff options
Diffstat (limited to 'arch/arm/mach-omap2/clock.c')
| -rw-r--r-- | arch/arm/mach-omap2/clock.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/clock.c b/arch/arm/mach-omap2/clock.c new file mode 100644 index 000000000..3c1d12dc8 --- /dev/null +++ b/arch/arm/mach-omap2/clock.c @@ -0,0 +1,141 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * linux/arch/arm/mach-omap2/clock.c + * + * Copyright (C) 2005-2008 Texas Instruments, Inc. + * Copyright (C) 2004-2010 Nokia Corporation + * + * Contacts: + * Richard Woodruff <r-woodruff2@ti.com> + * Paul Walmsley + */ +#undef DEBUG + +#include <linux/kernel.h> +#include <linux/export.h> +#include <linux/list.h> +#include <linux/errno.h> +#include <linux/err.h> +#include <linux/delay.h> +#include <linux/clk.h> +#include <linux/clk-provider.h> +#include <linux/io.h> +#include <linux/bitops.h> +#include <linux/of_address.h> +#include <asm/cpu.h> + +#include <trace/events/power.h> + +#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 + +struct ti_clk_ll_ops omap_clk_ll_ops = { + .clkdm_clk_enable = clkdm_clk_enable, + .clkdm_clk_disable = clkdm_clk_disable, + .clkdm_lookup = clkdm_lookup, + .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 + */ + +/** + * 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; + + if (omap_type() == OMAP2_DEVICE_TYPE_GP) + features.flags |= TI_CLK_DEVICE_TYPE_GP; + + /* 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); +} |