309 lines
8.9 KiB
C
309 lines
8.9 KiB
C
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/*
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* Copyright (c) 2010
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* Ben Gray <ben.r.gray@gmail.com>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Ben Gray.
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* 4. The name of the company nor the name of the author may be used to
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* endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BEN GRAY ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL BEN GRAY BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* Power, Reset and Clock Managment Module
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*
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* This is a very simple driver wrapper around the PRCM set of registers in
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* the OMAP3 chip. It allows you to turn on and off things like the functional
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* and interface clocks to the various on-chip modules.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <sys/resource.h>
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#include <sys/rman.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <machine/bus.h>
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#include <machine/cpu.h>
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#include <machine/cpufunc.h>
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#include <machine/resource.h>
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#include <machine/intr.h>
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#include <arm/ti/ti_prcm.h>
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/**
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* ti_clk_devmap - Array of clock devices, should be defined one per SoC
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*
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* This array is typically defined in one of the targeted *_prcm_clk.c
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* files and is specific to the given SoC platform. Each entry in the array
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* corresponds to an individual clock device.
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*/
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extern struct ti_clock_dev ti_clk_devmap[];
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/**
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* ti_prcm_clk_dev - returns a pointer to the clock device with given id
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* @clk: the ID of the clock device to get
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*
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* Simply iterates through the clk_devmap global array and returns a pointer
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* to the clock device if found.
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*
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* LOCKING:
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* None
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*
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* RETURNS:
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* The pointer to the clock device on success, on failure NULL is returned.
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*/
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static struct ti_clock_dev *
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ti_prcm_clk_dev(clk_ident_t clk)
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{
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struct ti_clock_dev *clk_dev;
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/* Find the clock within the devmap - it's a bit inefficent having a for
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* loop for this, but this function should only called when a driver is
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* being activated so IMHO not a big issue.
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*/
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clk_dev = &(ti_clk_devmap[0]);
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while (clk_dev->id != INVALID_CLK_IDENT) {
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if (clk_dev->id == clk) {
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return (clk_dev);
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}
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clk_dev++;
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}
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/* Sanity check we managed to find the clock */
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printf("ti_prcm: Failed to find clock device (%d)\n", clk);
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return (NULL);
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}
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/**
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* ti_prcm_clk_valid - enables a clock for a particular module
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* @clk: identifier for the module to enable, see ti_prcm.h for a list
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* of possible modules.
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* Example: OMAP3_MODULE_MMC1_ICLK or OMAP3_MODULE_GPTIMER10_FCLK.
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*
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* This function can enable either a functional or interface clock.
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*
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* The real work done to enable the clock is really done in the callback
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* function associated with the clock, this function is simply a wrapper
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* around that.
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*
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* LOCKING:
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* Internally locks the driver context.
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*
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* RETURNS:
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* Returns 0 on success or positive error code on failure.
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*/
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int
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ti_prcm_clk_valid(clk_ident_t clk)
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{
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int ret = 0;
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if (ti_prcm_clk_dev(clk) == NULL)
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ret = EINVAL;
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return (ret);
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}
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/**
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* ti_prcm_clk_enable - enables a clock for a particular module
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* @clk: identifier for the module to enable, see ti_prcm.h for a list
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* of possible modules.
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* Example: OMAP3_MODULE_MMC1_ICLK or OMAP3_MODULE_GPTIMER10_FCLK.
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*
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* This function can enable either a functional or interface clock.
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*
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* The real work done to enable the clock is really done in the callback
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* function associated with the clock, this function is simply a wrapper
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* around that.
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*
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* LOCKING:
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* Internally locks the driver context.
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*
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* RETURNS:
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* Returns 0 on success or positive error code on failure.
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*/
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int
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ti_prcm_clk_enable(clk_ident_t clk)
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{
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struct ti_clock_dev *clk_dev;
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int ret;
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/* Find the clock within the devmap - it's a bit inefficent having a for
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* loop for this, but this function should only called when a driver is
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* being activated so IMHO not a big issue.
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*/
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clk_dev = ti_prcm_clk_dev(clk);
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/* Sanity check we managed to find the clock */
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if (clk_dev == NULL)
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return (EINVAL);
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/* Activate the clock */
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if (clk_dev->clk_activate)
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ret = clk_dev->clk_activate(clk_dev);
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else
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ret = EINVAL;
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return (ret);
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}
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/**
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* ti_prcm_clk_disable - disables a clock for a particular module
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* @clk: identifier for the module to enable, see ti_prcm.h for a list
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* of possible modules.
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* Example: OMAP3_MODULE_MMC1_ICLK or OMAP3_MODULE_GPTIMER10_FCLK.
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*
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* This function can enable either a functional or interface clock.
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*
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* The real work done to enable the clock is really done in the callback
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* function associated with the clock, this function is simply a wrapper
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* around that.
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*
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* LOCKING:
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* Internally locks the driver context.
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*
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* RETURNS:
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* Returns 0 on success or positive error code on failure.
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*/
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int
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ti_prcm_clk_disable(clk_ident_t clk)
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{
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struct ti_clock_dev *clk_dev;
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int ret;
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/* Find the clock within the devmap - it's a bit inefficent having a for
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* loop for this, but this function should only called when a driver is
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* being activated so IMHO not a big issue.
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*/
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clk_dev = ti_prcm_clk_dev(clk);
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/* Sanity check we managed to find the clock */
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if (clk_dev == NULL)
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return (EINVAL);
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/* Activate the clock */
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if (clk_dev->clk_deactivate)
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ret = clk_dev->clk_deactivate(clk_dev);
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else
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ret = EINVAL;
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return (ret);
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}
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/**
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* ti_prcm_clk_set_source - sets the source
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* @clk: identifier for the module to enable, see ti_prcm.h for a list
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* of possible modules.
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* Example: OMAP3_MODULE_MMC1_ICLK or OMAP3_MODULE_GPTIMER10_FCLK.
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*
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* This function can enable either a functional or interface clock.
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*
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* The real work done to enable the clock is really done in the callback
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* function associated with the clock, this function is simply a wrapper
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* around that.
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*
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* LOCKING:
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* Internally locks the driver context.
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*
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* RETURNS:
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* Returns 0 on success or positive error code on failure.
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*/
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int
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ti_prcm_clk_set_source(clk_ident_t clk, clk_src_t clksrc)
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{
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struct ti_clock_dev *clk_dev;
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int ret;
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/* Find the clock within the devmap - it's a bit inefficent having a for
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* loop for this, but this function should only called when a driver is
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* being activated so IMHO not a big issue.
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*/
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clk_dev = ti_prcm_clk_dev(clk);
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/* Sanity check we managed to find the clock */
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if (clk_dev == NULL)
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return (EINVAL);
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/* Activate the clock */
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if (clk_dev->clk_set_source)
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ret = clk_dev->clk_set_source(clk_dev, clksrc);
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else
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ret = EINVAL;
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return (ret);
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}
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/**
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* ti_prcm_clk_get_source_freq - gets the source clock frequency
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* @clk: identifier for the module to enable, see ti_prcm.h for a list
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* of possible modules.
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* @freq: pointer to an integer that upon return will contain the src freq
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*
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* This function returns the frequency of the source clock.
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*
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* The real work done to enable the clock is really done in the callback
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* function associated with the clock, this function is simply a wrapper
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* around that.
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*
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* LOCKING:
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* Internally locks the driver context.
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*
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* RETURNS:
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* Returns 0 on success or positive error code on failure.
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*/
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int
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ti_prcm_clk_get_source_freq(clk_ident_t clk, unsigned int *freq)
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{
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struct ti_clock_dev *clk_dev;
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int ret;
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/* Find the clock within the devmap - it's a bit inefficent having a for
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* loop for this, but this function should only called when a driver is
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* being activated so IMHO not a big issue.
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*/
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clk_dev = ti_prcm_clk_dev(clk);
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/* Sanity check we managed to find the clock */
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if (clk_dev == NULL)
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return (EINVAL);
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/* Get the source frequency of the clock */
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if (clk_dev->clk_get_source_freq)
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ret = clk_dev->clk_get_source_freq(clk_dev, freq);
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else
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ret = EINVAL;
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return (ret);
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}
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