linux/arch/arm/mach-omap2/clock.c

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/*
* 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
*
* 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 <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>
ARM: OMAP: Split plat/hardware.h, use local soc.h for omap2+ As the plat and mach includes need to disappear for single zImage work, we need to remove plat/hardware.h. Do this by splitting plat/hardware.h into omap1 and omap2+ specific files. The old plat/hardware.h already has omap1 only defines, so it gets moved to mach/hardware.h for omap1. For omap2+, we use the local soc.h that for now just includes the related SoC headers to keep this patch more readable. Note that the local soc.h still includes plat/cpu.h that can be dealt with in later patches. Let's also include plat/serial.h from common.h for all the board-*.c files. This allows making the include files local later on without patching these files again. Note that only minimal changes are done in this patch for the drivers/watchdog/omap_wdt.c driver to keep things compiling. Further patches are needed to eventually remove cpu_is_omap usage in the drivers. Also only minimal changes are done to sound/soc/omap/* to remove the unneeded includes and to define OMAP44XX_MCPDM_L3_BASE locally so there's no need to include omap44xx.h. While at it, also sort some of the includes in the standard way. Cc: linux-watchdog@vger.kernel.org Cc: alsa-devel@alsa-project.org Cc: Peter Ujfalusi <peter.ujfalusi@ti.com> Cc: Jarkko Nikula <jarkko.nikula@bitmer.com> Cc: Liam Girdwood <lrg@ti.com> Acked-by: Wim Van Sebroeck <wim@iguana.be> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
2012-08-31 17:59:07 +00:00
#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
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+ clock: revise omap2_clk_{disable,enable}() Simplify the code in the omap2_clk_disable() and omap2_clk_enable() functions, reducing levels of indentation. This makes the code easier to read. Add some additional debugging pr_debug()s here also to help others understand what is going on. Revise the omap2_clk_disable() logic so that it now attempts to disable the clock's clockdomain before recursing up the clock tree. Simultaneously, ensure that omap2_clk_enable() is called on parent clocks first, before enabling the clockdomain. This ensures that a parent clock's clockdomain is enabled before the child clock's clockdomain. These sequences should be the inverse of each other. Revise the omap2_clk_enable() logic so that it now cleans up after itself upon encountering an error. Previously, an error enabling a parent clock could have resulted in inconsistent usecounts on the enclosing clockdomain. Remove the trivial _omap2_clk_disable() and _omap2_clk_enable() static functions, and replace it with the clkops calls that they were executing. For all this to work, the clockdomain omap2_clkdm_clk_enable() and omap2_clkdm_clk_disable() code must not return an error on clockdomains without CLKSTCTRL registers; so modify those functions to simply return 0 in that case. While here, add some basic kerneldoc documentation on both functions, and get rid of some old non-CodingStyle-compliant comments that have existed since the dawn of time (at least, the OMAP clock framework's time). Signed-off-by: Paul Walmsley <paul@pwsan.com> Cc: Richard Woodruff <r-woodruff2@ti.com> Cc: Rajendra Nayak <rnayak@ti.com>
2010-02-23 05:09:38 +00:00
/*
* 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;
ti_clk_setup_features(&features);
}