mirror of https://gitee.com/openkylin/linux.git
128 lines
2.9 KiB
C
128 lines
2.9 KiB
C
/*
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* linux/arch/arm/mach-omap2/prcm.c
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*
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* OMAP 24xx Power Reset and Clock Management (PRCM) functions
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*
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* Copyright (C) 2005 Nokia Corporation
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*
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* Written by Tony Lindgren <tony.lindgren@nokia.com>
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*
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* Some pieces of code Copyright (C) 2005 Texas Instruments, Inc.
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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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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <asm/arch/common.h>
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#include <asm/arch/prcm.h>
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#include "clock.h"
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#include "prm.h"
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#include "prm-regbits-24xx.h"
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static void __iomem *prm_base;
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static void __iomem *cm_base;
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u32 omap_prcm_get_reset_sources(void)
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{
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/* XXX This presumably needs modification for 34XX */
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return prm_read_mod_reg(WKUP_MOD, RM_RSTST) & 0x7f;
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}
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EXPORT_SYMBOL(omap_prcm_get_reset_sources);
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/* Resets clock rates and reboots the system. Only called from system.h */
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void omap_prcm_arch_reset(char mode)
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{
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s16 prcm_offs;
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omap2_clk_prepare_for_reboot();
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if (cpu_is_omap24xx())
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prcm_offs = WKUP_MOD;
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else if (cpu_is_omap34xx())
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prcm_offs = OMAP3430_GR_MOD;
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else
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WARN_ON(1);
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prm_set_mod_reg_bits(OMAP_RST_DPLL3, prcm_offs, RM_RSTCTRL);
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}
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static inline u32 __omap_prcm_read(void __iomem *base, s16 module, u16 reg)
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{
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BUG_ON(!base);
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return __raw_readl(base + module + reg);
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}
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static inline void __omap_prcm_write(u32 value, void __iomem *base,
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s16 module, u16 reg)
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{
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BUG_ON(!base);
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__raw_writel(value, base + module + reg);
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}
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/* Read a register in a PRM module */
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u32 prm_read_mod_reg(s16 module, u16 idx)
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{
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return __omap_prcm_read(prm_base, module, idx);
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}
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EXPORT_SYMBOL(prm_read_mod_reg);
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/* Write into a register in a PRM module */
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void prm_write_mod_reg(u32 val, s16 module, u16 idx)
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{
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__omap_prcm_write(val, prm_base, module, idx);
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}
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EXPORT_SYMBOL(prm_write_mod_reg);
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/* Read-modify-write a register in a PRM module. Caller must lock */
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u32 prm_rmw_mod_reg_bits(u32 mask, u32 bits, s16 module, s16 idx)
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{
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u32 v;
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v = prm_read_mod_reg(module, idx);
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v &= ~mask;
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v |= bits;
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prm_write_mod_reg(v, module, idx);
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return v;
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}
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EXPORT_SYMBOL(prm_rmw_mod_reg_bits);
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/* Read a register in a CM module */
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u32 cm_read_mod_reg(s16 module, u16 idx)
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{
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return __omap_prcm_read(cm_base, module, idx);
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}
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EXPORT_SYMBOL(cm_read_mod_reg);
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/* Write into a register in a CM module */
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void cm_write_mod_reg(u32 val, s16 module, u16 idx)
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{
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__omap_prcm_write(val, cm_base, module, idx);
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}
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EXPORT_SYMBOL(cm_write_mod_reg);
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/* Read-modify-write a register in a CM module. Caller must lock */
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u32 cm_rmw_mod_reg_bits(u32 mask, u32 bits, s16 module, s16 idx)
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{
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u32 v;
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v = cm_read_mod_reg(module, idx);
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v &= ~mask;
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v |= bits;
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cm_write_mod_reg(v, module, idx);
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return v;
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}
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EXPORT_SYMBOL(cm_rmw_mod_reg_bits);
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void __init omap2_set_globals_prcm(struct omap_globals *omap2_globals)
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{
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prm_base = omap2_globals->prm;
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cm_base = omap2_globals->cm;
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}
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