94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
/*
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* SMS/SDRC (SDRAM controller) common code for OMAP2/3
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*
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* Copyright (C) 2005, 2008 Texas Instruments Inc.
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* Copyright (C) 2005, 2008 Nokia Corporation
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*
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* Tony Lindgren <tony@atomide.com>
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* Paul Walmsley
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* Richard Woodruff <r-woodruff2@ti.com>
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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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#undef DEBUG
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/errno.h>
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#include <linux/delay.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <mach/common.h>
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#include <mach/clock.h>
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#include <mach/sram.h>
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#include "prm.h"
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#include <mach/sdrc.h>
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#include "sdrc.h"
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static struct omap_sdrc_params *sdrc_init_params;
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void __iomem *omap2_sdrc_base;
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void __iomem *omap2_sms_base;
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/**
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* omap2_sdrc_get_params - return SDRC register values for a given clock rate
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* @r: SDRC clock rate (in Hz)
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*
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* Return pre-calculated values for the SDRC_ACTIM_CTRLA,
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* SDRC_ACTIM_CTRLB, SDRC_RFR_CTRL, and SDRC_MR registers, for a given
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* SDRC clock rate 'r'. These parameters control various timing
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* delays in the SDRAM controller that are expressed in terms of the
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* number of SDRC clock cycles to wait; hence the clock rate
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* dependency. Note that sdrc_init_params must be sorted rate
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* descending. Also assumes that both chip-selects use the same
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* timing parameters. Returns a struct omap_sdrc_params * upon
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* success, or NULL upon failure.
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*/
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struct omap_sdrc_params *omap2_sdrc_get_params(unsigned long r)
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{
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struct omap_sdrc_params *sp;
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sp = sdrc_init_params;
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while (sp->rate != r)
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sp++;
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if (!sp->rate)
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return NULL;
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return sp;
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}
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void __init omap2_set_globals_sdrc(struct omap_globals *omap2_globals)
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{
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omap2_sdrc_base = omap2_globals->sdrc;
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omap2_sms_base = omap2_globals->sms;
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}
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/* turn on smart idle modes for SDRAM scheduler and controller */
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void __init omap2_sdrc_init(struct omap_sdrc_params *sp)
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{
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u32 l;
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l = sms_read_reg(SMS_SYSCONFIG);
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l &= ~(0x3 << 3);
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l |= (0x2 << 3);
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sms_write_reg(l, SMS_SYSCONFIG);
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l = sdrc_read_reg(SDRC_SYSCONFIG);
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l &= ~(0x3 << 3);
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l |= (0x2 << 3);
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sdrc_write_reg(l, SDRC_SYSCONFIG);
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sdrc_init_params = sp;
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}
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