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b824efae TL |
1 | /* |
2 | * linux/arch/arm/mach-omap2/memory.c | |
3 | * | |
4 | * Memory timing related functions for OMAP24XX | |
5 | * | |
6 | * Copyright (C) 2005 Texas Instruments Inc. | |
7 | * Richard Woodruff <r-woodruff2@ti.com> | |
8 | * | |
9 | * Copyright (C) 2005 Nokia Corporation | |
10 | * Tony Lindgren <tony@atomide.com> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License version 2 as | |
14 | * published by the Free Software Foundation. | |
15 | */ | |
16 | ||
b824efae TL |
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> | |
fced80c7 | 24 | #include <linux/io.h> |
b824efae | 25 | |
a09e64fb RK |
26 | #include <mach/common.h> |
27 | #include <mach/clock.h> | |
28 | #include <mach/sram.h> | |
b824efae | 29 | |
44595982 PW |
30 | #include "prm.h" |
31 | ||
b824efae | 32 | #include "memory.h" |
44595982 | 33 | #include "sdrc.h" |
b824efae | 34 | |
a58caad1 TL |
35 | void __iomem *omap2_sdrc_base; |
36 | void __iomem *omap2_sms_base; | |
33c99075 | 37 | |
b824efae | 38 | static struct memory_timings mem_timings; |
44595982 | 39 | static u32 curr_perf_level = CORE_CLK_SRC_DPLL_X2; |
b824efae TL |
40 | |
41 | u32 omap2_memory_get_slow_dll_ctrl(void) | |
42 | { | |
43 | return mem_timings.slow_dll_ctrl; | |
44 | } | |
45 | ||
46 | u32 omap2_memory_get_fast_dll_ctrl(void) | |
47 | { | |
48 | return mem_timings.fast_dll_ctrl; | |
49 | } | |
50 | ||
51 | u32 omap2_memory_get_type(void) | |
52 | { | |
53 | return mem_timings.m_type; | |
54 | } | |
55 | ||
6b8858a9 PW |
56 | /* |
57 | * Check the DLL lock state, and return tue if running in unlock mode. | |
58 | * This is needed to compensate for the shifted DLL value in unlock mode. | |
59 | */ | |
60 | u32 omap2_dll_force_needed(void) | |
61 | { | |
62 | /* dlla and dllb are a set */ | |
63 | u32 dll_state = sdrc_read_reg(SDRC_DLLA_CTRL); | |
64 | ||
65 | if ((dll_state & (1 << 2)) == (1 << 2)) | |
66 | return 1; | |
67 | else | |
68 | return 0; | |
69 | } | |
70 | ||
71 | /* | |
72 | * 'level' is the value to store to CM_CLKSEL2_PLL.CORE_CLK_SRC. | |
73 | * Practical values are CORE_CLK_SRC_DPLL (for CORE_CLK = DPLL_CLK) or | |
74 | * CORE_CLK_SRC_DPLL_X2 (for CORE_CLK = * DPLL_CLK * 2) | |
75 | */ | |
76 | u32 omap2_reprogram_sdrc(u32 level, u32 force) | |
77 | { | |
78 | u32 dll_ctrl, m_type; | |
79 | u32 prev = curr_perf_level; | |
80 | unsigned long flags; | |
81 | ||
82 | if ((curr_perf_level == level) && !force) | |
83 | return prev; | |
84 | ||
85 | if (level == CORE_CLK_SRC_DPLL) { | |
86 | dll_ctrl = omap2_memory_get_slow_dll_ctrl(); | |
87 | } else if (level == CORE_CLK_SRC_DPLL_X2) { | |
88 | dll_ctrl = omap2_memory_get_fast_dll_ctrl(); | |
89 | } else { | |
90 | return prev; | |
91 | } | |
92 | ||
93 | m_type = omap2_memory_get_type(); | |
94 | ||
95 | local_irq_save(flags); | |
96 | __raw_writel(0xffff, OMAP24XX_PRCM_VOLTSETUP); | |
97 | omap2_sram_reprogram_sdrc(level, dll_ctrl, m_type); | |
98 | curr_perf_level = level; | |
99 | local_irq_restore(flags); | |
100 | ||
101 | return prev; | |
102 | } | |
103 | ||
b824efae TL |
104 | void omap2_init_memory_params(u32 force_lock_to_unlock_mode) |
105 | { | |
106 | unsigned long dll_cnt; | |
107 | u32 fast_dll = 0; | |
108 | ||
44595982 | 109 | mem_timings.m_type = !((sdrc_read_reg(SDRC_MR_0) & 0x3) == 0x1); /* DDR = 1, SDR = 0 */ |
b824efae TL |
110 | |
111 | /* 2422 es2.05 and beyond has a single SIP DDR instead of 2 like others. | |
112 | * In the case of 2422, its ok to use CS1 instead of CS0. | |
113 | */ | |
114 | if (cpu_is_omap2422()) | |
115 | mem_timings.base_cs = 1; | |
116 | else | |
117 | mem_timings.base_cs = 0; | |
118 | ||
119 | if (mem_timings.m_type != M_DDR) | |
120 | return; | |
121 | ||
122 | /* With DDR we need to determine the low frequency DLL value */ | |
123 | if (((mem_timings.fast_dll_ctrl & (1 << 2)) == M_LOCK_CTRL)) | |
124 | mem_timings.dll_mode = M_UNLOCK; | |
125 | else | |
126 | mem_timings.dll_mode = M_LOCK; | |
127 | ||
128 | if (mem_timings.base_cs == 0) { | |
44595982 PW |
129 | fast_dll = sdrc_read_reg(SDRC_DLLA_CTRL); |
130 | dll_cnt = sdrc_read_reg(SDRC_DLLA_STATUS) & 0xff00; | |
b824efae | 131 | } else { |
44595982 PW |
132 | fast_dll = sdrc_read_reg(SDRC_DLLB_CTRL); |
133 | dll_cnt = sdrc_read_reg(SDRC_DLLB_STATUS) & 0xff00; | |
b824efae TL |
134 | } |
135 | if (force_lock_to_unlock_mode) { | |
136 | fast_dll &= ~0xff00; | |
137 | fast_dll |= dll_cnt; /* Current lock mode */ | |
138 | } | |
139 | /* set fast timings with DLL filter disabled */ | |
140 | mem_timings.fast_dll_ctrl = (fast_dll | (3 << 8)); | |
141 | ||
142 | /* No disruptions, DDR will be offline & C-ABI not followed */ | |
143 | omap2_sram_ddr_init(&mem_timings.slow_dll_ctrl, | |
144 | mem_timings.fast_dll_ctrl, | |
145 | mem_timings.base_cs, | |
146 | force_lock_to_unlock_mode); | |
147 | mem_timings.slow_dll_ctrl &= 0xff00; /* Keep lock value */ | |
148 | ||
149 | /* Turn status into unlock ctrl */ | |
150 | mem_timings.slow_dll_ctrl |= | |
151 | ((mem_timings.fast_dll_ctrl & 0xF) | (1 << 2)); | |
152 | ||
153 | /* 90 degree phase for anything below 133Mhz + disable DLL filter */ | |
154 | mem_timings.slow_dll_ctrl |= ((1 << 1) | (3 << 8)); | |
155 | } | |
33c99075 | 156 | |
a58caad1 TL |
157 | void __init omap2_set_globals_memory(struct omap_globals *omap2_globals) |
158 | { | |
159 | omap2_sdrc_base = omap2_globals->sdrc; | |
160 | omap2_sms_base = omap2_globals->sms; | |
161 | } | |
162 | ||
742c53e4 | 163 | /* turn on smart idle modes for SDRAM scheduler and controller */ |
33c99075 JY |
164 | void __init omap2_init_memory(void) |
165 | { | |
166 | u32 l; | |
167 | ||
44595982 | 168 | l = sms_read_reg(SMS_SYSCONFIG); |
33c99075 JY |
169 | l &= ~(0x3 << 3); |
170 | l |= (0x2 << 3); | |
44595982 | 171 | sms_write_reg(l, SMS_SYSCONFIG); |
33c99075 | 172 | |
44595982 | 173 | l = sdrc_read_reg(SDRC_SYSCONFIG); |
33c99075 JY |
174 | l &= ~(0x3 << 3); |
175 | l |= (0x2 << 3); | |
44595982 | 176 | sdrc_write_reg(l, SDRC_SYSCONFIG); |
33c99075 | 177 | } |