mirror of https://gitee.com/openkylin/linux.git
141 lines
4.3 KiB
C
141 lines
4.3 KiB
C
/*
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* OMAP2+ common Clock Management (CM) IP block functions
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*
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* Copyright (C) 2012 Texas Instruments, Inc.
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* Paul Walmsley
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* XXX This code should eventually be moved to a CM driver.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/bug.h>
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#include "cm2xxx.h"
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#include "cm3xxx.h"
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#include "cm44xx.h"
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/*
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* cm_ll_data: function pointers to SoC-specific implementations of
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* common CM functions
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*/
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static struct cm_ll_data null_cm_ll_data;
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static struct cm_ll_data *cm_ll_data = &null_cm_ll_data;
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/* cm_base: base virtual address of the CM IP block */
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void __iomem *cm_base;
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/* cm2_base: base virtual address of the CM2 IP block (OMAP44xx only) */
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void __iomem *cm2_base;
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/**
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* omap2_set_globals_cm - set the CM/CM2 base addresses (for early use)
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* @cm: CM base virtual address
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* @cm2: CM2 base virtual address (if present on the booted SoC)
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*
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* XXX Will be replaced when the PRM/CM drivers are completed.
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*/
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void __init omap2_set_globals_cm(void __iomem *cm, void __iomem *cm2)
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{
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cm_base = cm;
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cm2_base = cm2;
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}
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/**
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* cm_split_idlest_reg - split CM_IDLEST reg addr into its components
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* @idlest_reg: CM_IDLEST* virtual address
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* @prcm_inst: pointer to an s16 to return the PRCM instance offset
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* @idlest_reg_id: pointer to a u8 to return the CM_IDLESTx register ID
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*
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* Given an absolute CM_IDLEST register address @idlest_reg, passes
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* the PRCM instance offset and IDLEST register ID back to the caller
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* via the @prcm_inst and @idlest_reg_id. Returns -EINVAL upon error,
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* or 0 upon success. XXX This function is only needed until absolute
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* register addresses are removed from the OMAP struct clk records.
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*/
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int cm_split_idlest_reg(void __iomem *idlest_reg, s16 *prcm_inst,
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u8 *idlest_reg_id)
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{
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if (!cm_ll_data->split_idlest_reg) {
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WARN_ONCE(1, "cm: %s: no low-level function defined\n",
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__func__);
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return -EINVAL;
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}
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return cm_ll_data->split_idlest_reg(idlest_reg, prcm_inst,
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idlest_reg_id);
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}
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/**
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* cm_wait_module_ready - wait for a module to leave idle or standby
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* @prcm_mod: PRCM module offset
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* @idlest_id: CM_IDLESTx register ID (i.e., x = 1, 2, 3)
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* @idlest_shift: shift of the bit in the CM_IDLEST* register to check
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*
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* Wait for the PRCM to indicate that the module identified by
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* (@prcm_mod, @idlest_id, @idlest_shift) is clocked. Return 0 upon
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* success, -EBUSY if the module doesn't enable in time, or -EINVAL if
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* no per-SoC wait_module_ready() function pointer has been registered
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* or if the idlest register is unknown on the SoC.
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*/
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int cm_wait_module_ready(s16 prcm_mod, u8 idlest_id, u8 idlest_shift)
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{
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if (!cm_ll_data->wait_module_ready) {
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WARN_ONCE(1, "cm: %s: no low-level function defined\n",
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__func__);
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return -EINVAL;
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}
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return cm_ll_data->wait_module_ready(prcm_mod, idlest_id, idlest_shift);
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}
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/**
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* cm_register - register per-SoC low-level data with the CM
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* @cld: low-level per-SoC OMAP CM data & function pointers to register
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*
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* Register per-SoC low-level OMAP CM data and function pointers with
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* the OMAP CM common interface. The caller must keep the data
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* pointed to by @cld valid until it calls cm_unregister() and
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* it returns successfully. Returns 0 upon success, -EINVAL if @cld
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* is NULL, or -EEXIST if cm_register() has already been called
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* without an intervening cm_unregister().
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*/
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int cm_register(struct cm_ll_data *cld)
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{
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if (!cld)
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return -EINVAL;
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if (cm_ll_data != &null_cm_ll_data)
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return -EEXIST;
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cm_ll_data = cld;
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return 0;
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}
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/**
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* cm_unregister - unregister per-SoC low-level data & function pointers
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* @cld: low-level per-SoC OMAP CM data & function pointers to unregister
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*
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* Unregister per-SoC low-level OMAP CM data and function pointers
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* that were previously registered with cm_register(). The
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* caller may not destroy any of the data pointed to by @cld until
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* this function returns successfully. Returns 0 upon success, or
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* -EINVAL if @cld is NULL or if @cld does not match the struct
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* cm_ll_data * previously registered by cm_register().
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*/
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int cm_unregister(struct cm_ll_data *cld)
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{
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if (!cld || cm_ll_data != cld)
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return -EINVAL;
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cm_ll_data = &null_cm_ll_data;
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return 0;
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}
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