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1 | /* |
2 | * SMS/SDRC (SDRAM controller) common code for OMAP2/3 | |
3 | * | |
4 | * Copyright (C) 2005, 2008 Texas Instruments Inc. | |
5 | * Copyright (C) 2005, 2008 Nokia Corporation | |
6 | * | |
7 | * Tony Lindgren <tony@atomide.com> | |
8 | * Paul Walmsley | |
9 | * Richard Woodruff <r-woodruff2@ti.com> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | */ | |
87246b75 | 15 | #undef DEBUG |
f2ab9977 PW |
16 | |
17 | #include <linux/module.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/device.h> | |
20 | #include <linux/list.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/delay.h> | |
23 | #include <linux/clk.h> | |
24 | #include <linux/io.h> | |
25 | ||
a135eaae PW |
26 | #include "common.h" |
27 | #include "clock.h" | |
f2ab9977 PW |
28 | #include "sdrc.h" |
29 | ||
58cda884 | 30 | static struct omap_sdrc_params *sdrc_init_params_cs0, *sdrc_init_params_cs1; |
87246b75 | 31 | |
f2ab9977 PW |
32 | void __iomem *omap2_sdrc_base; |
33 | void __iomem *omap2_sms_base; | |
34 | ||
8a917d2f KJ |
35 | struct omap2_sms_regs { |
36 | u32 sms_sysconfig; | |
37 | }; | |
38 | ||
39 | static struct omap2_sms_regs sms_context; | |
40 | ||
98cfe5ab PW |
41 | /* SDRC_POWER register bits */ |
42 | #define SDRC_POWER_EXTCLKDIS_SHIFT 3 | |
43 | #define SDRC_POWER_PWDENA_SHIFT 2 | |
44 | #define SDRC_POWER_PAGEPOLICY_SHIFT 0 | |
87246b75 | 45 | |
8a917d2f KJ |
46 | /** |
47 | * omap2_sms_save_context - Save SMS registers | |
48 | * | |
49 | * Save SMS registers that need to be restored after off mode. | |
50 | */ | |
51 | void omap2_sms_save_context(void) | |
52 | { | |
53 | sms_context.sms_sysconfig = sms_read_reg(SMS_SYSCONFIG); | |
54 | } | |
55 | ||
56 | /** | |
57 | * omap2_sms_restore_context - Restore SMS registers | |
58 | * | |
59 | * Restore SMS registers that need to be Restored after off mode. | |
60 | */ | |
61 | void omap2_sms_restore_context(void) | |
62 | { | |
63 | sms_write_reg(sms_context.sms_sysconfig, SMS_SYSCONFIG); | |
64 | } | |
65 | ||
87246b75 PW |
66 | /** |
67 | * omap2_sdrc_get_params - return SDRC register values for a given clock rate | |
68 | * @r: SDRC clock rate (in Hz) | |
58cda884 JP |
69 | * @sdrc_cs0: chip select 0 ram timings ** |
70 | * @sdrc_cs1: chip select 1 ram timings ** | |
87246b75 PW |
71 | * |
72 | * Return pre-calculated values for the SDRC_ACTIM_CTRLA, | |
58cda884 JP |
73 | * SDRC_ACTIM_CTRLB, SDRC_RFR_CTRL and SDRC_MR registers in sdrc_cs[01] |
74 | * structs,for a given SDRC clock rate 'r'. | |
75 | * These parameters control various timing delays in the SDRAM controller | |
76 | * that are expressed in terms of the number of SDRC clock cycles to | |
77 | * wait; hence the clock rate dependency. | |
78 | * | |
79 | * Supports 2 different timing parameters for both chip selects. | |
80 | * | |
81 | * Note 1: the sdrc_init_params_cs[01] must be sorted rate descending. | |
82 | * Note 2: If sdrc_init_params_cs_1 is not NULL it must be of same size | |
83 | * as sdrc_init_params_cs_0. | |
84 | * | |
85 | * Fills in the struct omap_sdrc_params * for each chip select. | |
86 | * Returns 0 upon success or -1 upon failure. | |
87246b75 | 87 | */ |
58cda884 JP |
88 | int omap2_sdrc_get_params(unsigned long r, |
89 | struct omap_sdrc_params **sdrc_cs0, | |
90 | struct omap_sdrc_params **sdrc_cs1) | |
87246b75 | 91 | { |
58cda884 | 92 | struct omap_sdrc_params *sp0, *sp1; |
87246b75 | 93 | |
58cda884 JP |
94 | if (!sdrc_init_params_cs0) |
95 | return -1; | |
8bd22949 | 96 | |
58cda884 JP |
97 | sp0 = sdrc_init_params_cs0; |
98 | sp1 = sdrc_init_params_cs1; | |
87246b75 | 99 | |
58cda884 JP |
100 | while (sp0->rate && sp0->rate != r) { |
101 | sp0++; | |
102 | if (sdrc_init_params_cs1) | |
103 | sp1++; | |
104 | } | |
87246b75 | 105 | |
58cda884 JP |
106 | if (!sp0->rate) |
107 | return -1; | |
87246b75 | 108 | |
58cda884 JP |
109 | *sdrc_cs0 = sp0; |
110 | *sdrc_cs1 = sp1; | |
111 | return 0; | |
87246b75 PW |
112 | } |
113 | ||
114 | ||
b6a4226c | 115 | void __init omap2_set_globals_sdrc(void __iomem *sdrc, void __iomem *sms) |
f2ab9977 | 116 | { |
b6a4226c PW |
117 | omap2_sdrc_base = sdrc; |
118 | omap2_sms_base = sms; | |
f2ab9977 PW |
119 | } |
120 | ||
98cfe5ab PW |
121 | /** |
122 | * omap2_sdrc_init - initialize SMS, SDRC devices on boot | |
58cda884 JP |
123 | * @sdrc_cs[01]: pointers to a null-terminated list of struct omap_sdrc_params |
124 | * Support for 2 chip selects timings | |
98cfe5ab PW |
125 | * |
126 | * Turn on smart idle modes for SDRAM scheduler and controller. | |
127 | * Program a known-good configuration for the SDRC to deal with buggy | |
128 | * bootloaders. | |
129 | */ | |
58cda884 JP |
130 | void __init omap2_sdrc_init(struct omap_sdrc_params *sdrc_cs0, |
131 | struct omap_sdrc_params *sdrc_cs1) | |
f2ab9977 PW |
132 | { |
133 | u32 l; | |
134 | ||
135 | l = sms_read_reg(SMS_SYSCONFIG); | |
136 | l &= ~(0x3 << 3); | |
137 | l |= (0x2 << 3); | |
138 | sms_write_reg(l, SMS_SYSCONFIG); | |
139 | ||
140 | l = sdrc_read_reg(SDRC_SYSCONFIG); | |
141 | l &= ~(0x3 << 3); | |
142 | l |= (0x2 << 3); | |
143 | sdrc_write_reg(l, SDRC_SYSCONFIG); | |
87246b75 | 144 | |
58cda884 JP |
145 | sdrc_init_params_cs0 = sdrc_cs0; |
146 | sdrc_init_params_cs1 = sdrc_cs1; | |
98cfe5ab PW |
147 | |
148 | /* XXX Enable SRFRONIDLEREQ here also? */ | |
75f251e3 PW |
149 | /* |
150 | * PWDENA should not be set due to 34xx erratum 1.150 - PWDENA | |
151 | * can cause random memory corruption | |
152 | */ | |
98cfe5ab | 153 | l = (1 << SDRC_POWER_EXTCLKDIS_SHIFT) | |
98cfe5ab PW |
154 | (1 << SDRC_POWER_PAGEPOLICY_SHIFT); |
155 | sdrc_write_reg(l, SDRC_POWER); | |
8a917d2f | 156 | omap2_sms_save_context(); |
f2ab9977 | 157 | } |