blob: 2a30060cb4b78ec897bb668b31c665c26c160827 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
/*
* SMS/SDRC (SDRAM controller) common code for OMAP2/3
*
* Copyright (C) 2005, 2008 Texas Instruments Inc.
* Copyright (C) 2005, 2008 Nokia Corporation
*
* Tony Lindgren <tony@atomide.com>
* Paul Walmsley
* Richard Woodruff <r-woodruff2@ti.com>
*
* 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/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <mach/common.h>
#include <mach/clock.h>
#include <mach/sram.h>
#include "prm.h"
#include <mach/sdrc.h>
#include "sdrc.h"
static struct omap_sdrc_params *sdrc_init_params;
void __iomem *omap2_sdrc_base;
void __iomem *omap2_sms_base;
/**
* omap2_sdrc_get_params - return SDRC register values for a given clock rate
* @r: SDRC clock rate (in Hz)
*
* Return pre-calculated values for the SDRC_ACTIM_CTRLA,
* SDRC_ACTIM_CTRLB, SDRC_RFR_CTRL, and SDRC_MR registers, for a given
* SDRC clock rate 'r'. These parameters control various timing
* delays in the SDRAM controller that are expressed in terms of the
* number of SDRC clock cycles to wait; hence the clock rate
* dependency. Note that sdrc_init_params must be sorted rate
* descending. Also assumes that both chip-selects use the same
* timing parameters. Returns a struct omap_sdrc_params * upon
* success, or NULL upon failure.
*/
struct omap_sdrc_params *omap2_sdrc_get_params(unsigned long r)
{
struct omap_sdrc_params *sp;
sp = sdrc_init_params;
while (sp->rate != r)
sp++;
if (!sp->rate)
return NULL;
return sp;
}
void __init omap2_set_globals_sdrc(struct omap_globals *omap2_globals)
{
omap2_sdrc_base = omap2_globals->sdrc;
omap2_sms_base = omap2_globals->sms;
}
/* turn on smart idle modes for SDRAM scheduler and controller */
void __init omap2_sdrc_init(struct omap_sdrc_params *sp)
{
u32 l;
l = sms_read_reg(SMS_SYSCONFIG);
l &= ~(0x3 << 3);
l |= (0x2 << 3);
sms_write_reg(l, SMS_SYSCONFIG);
l = sdrc_read_reg(SDRC_SYSCONFIG);
l &= ~(0x3 << 3);
l |= (0x2 << 3);
sdrc_write_reg(l, SDRC_SYSCONFIG);
sdrc_init_params = sp;
}
|
