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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * SDRAM timing related functions for OMAP2xxx
4 *
5 * Copyright (C) 2005, 2008 Texas Instruments Inc.
6 * Copyright (C) 2005, 2008 Nokia Corporation
7 *
8 * Tony Lindgren <tony@atomide.com>
9 * Paul Walmsley
10 * Richard Woodruff <r-woodruff2@ti.com>
11 */
12
13#include <linux/module.h>
14#include <linux/kernel.h>
15#include <linux/device.h>
16#include <linux/list.h>
17#include <linux/errno.h>
18#include <linux/delay.h>
19#include <linux/clk.h>
20#include <linux/io.h>
21
22#include "soc.h"
23#include "iomap.h"
24#include "common.h"
25#include "prm2xxx.h"
26#include "clock.h"
27#include "sdrc.h"
28#include "sram.h"
29
30/* Memory timing, DLL mode flags */
31#define M_DDR 1
32#define M_LOCK_CTRL (1 << 2)
33#define M_UNLOCK 0
34#define M_LOCK 1
35
36
37static struct memory_timings mem_timings;
38static u32 curr_perf_level = CORE_CLK_SRC_DPLL_X2;
39
40static u32 omap2xxx_sdrc_get_slow_dll_ctrl(void)
41{
42 return mem_timings.slow_dll_ctrl;
43}
44
45static u32 omap2xxx_sdrc_get_fast_dll_ctrl(void)
46{
47 return mem_timings.fast_dll_ctrl;
48}
49
50static u32 omap2xxx_sdrc_get_type(void)
51{
52 return mem_timings.m_type;
53}
54
55/*
56 * Check the DLL lock state, and return tue if running in unlock mode.
57 * This is needed to compensate for the shifted DLL value in unlock mode.
58 */
59u32 omap2xxx_sdrc_dll_is_unlocked(void)
60{
61 /* dlla and dllb are a set */
62 u32 dll_state = sdrc_read_reg(SDRC_DLLA_CTRL);
63
64 if ((dll_state & (1 << 2)) == (1 << 2))
65 return 1;
66 else
67 return 0;
68}
69
70/*
71 * 'level' is the value to store to CM_CLKSEL2_PLL.CORE_CLK_SRC.
72 * Practical values are CORE_CLK_SRC_DPLL (for CORE_CLK = DPLL_CLK) or
73 * CORE_CLK_SRC_DPLL_X2 (for CORE_CLK = * DPLL_CLK * 2)
74 *
75 * Used by the clock framework during CORE DPLL changes
76 */
77u32 omap2xxx_sdrc_reprogram(u32 level, u32 force)
78{
79 u32 dll_ctrl, m_type;
80 u32 prev = curr_perf_level;
81 unsigned long flags;
82
83 if ((curr_perf_level == level) && !force)
84 return prev;
85
86 if (level == CORE_CLK_SRC_DPLL)
87 dll_ctrl = omap2xxx_sdrc_get_slow_dll_ctrl();
88 else if (level == CORE_CLK_SRC_DPLL_X2)
89 dll_ctrl = omap2xxx_sdrc_get_fast_dll_ctrl();
90 else
91 return prev;
92
93 m_type = omap2xxx_sdrc_get_type();
94
95 local_irq_save(flags);
96 /*
97 * XXX These calls should be abstracted out through a
98 * prm2xxx.c function
99 */
100 if (cpu_is_omap2420())
101 writel_relaxed(0xffff, OMAP2420_PRCM_VOLTSETUP);
102 else
103 writel_relaxed(0xffff, OMAP2430_PRCM_VOLTSETUP);
104 omap2_sram_reprogram_sdrc(level, dll_ctrl, m_type);
105 curr_perf_level = level;
106 local_irq_restore(flags);
107
108 return prev;
109}
110
111/* Used by the clock framework during CORE DPLL changes */
112void omap2xxx_sdrc_init_params(u32 force_lock_to_unlock_mode)
113{
114 unsigned long dll_cnt;
115 u32 fast_dll = 0;
116
117 /* DDR = 1, SDR = 0 */
118 mem_timings.m_type = !((sdrc_read_reg(SDRC_MR_0) & 0x3) == 0x1);
119
120 /* 2422 es2.05 and beyond has a single SIP DDR instead of 2 like others.
121 * In the case of 2422, its ok to use CS1 instead of CS0.
122 */
123 if (cpu_is_omap2422())
124 mem_timings.base_cs = 1;
125 else
126 mem_timings.base_cs = 0;
127
128 if (mem_timings.m_type != M_DDR)
129 return;
130
131 /* With DDR we need to determine the low frequency DLL value */
132 if (((mem_timings.fast_dll_ctrl & (1 << 2)) == M_LOCK_CTRL))
133 mem_timings.dll_mode = M_UNLOCK;
134 else
135 mem_timings.dll_mode = M_LOCK;
136
137 if (mem_timings.base_cs == 0) {
138 fast_dll = sdrc_read_reg(SDRC_DLLA_CTRL);
139 dll_cnt = sdrc_read_reg(SDRC_DLLA_STATUS) & 0xff00;
140 } else {
141 fast_dll = sdrc_read_reg(SDRC_DLLB_CTRL);
142 dll_cnt = sdrc_read_reg(SDRC_DLLB_STATUS) & 0xff00;
143 }
144 if (force_lock_to_unlock_mode) {
145 fast_dll &= ~0xff00;
146 fast_dll |= dll_cnt; /* Current lock mode */
147 }
148 /* set fast timings with DLL filter disabled */
149 mem_timings.fast_dll_ctrl = (fast_dll | (3 << 8));
150
151 /* No disruptions, DDR will be offline & C-ABI not followed */
152 omap2_sram_ddr_init(&mem_timings.slow_dll_ctrl,
153 mem_timings.fast_dll_ctrl,
154 mem_timings.base_cs,
155 force_lock_to_unlock_mode);
156 mem_timings.slow_dll_ctrl &= 0xff00; /* Keep lock value */
157
158 /* Turn status into unlock ctrl */
159 mem_timings.slow_dll_ctrl |=
160 ((mem_timings.fast_dll_ctrl & 0xF) | (1 << 2));
161
162 /* 90 degree phase for anything below 133MHz + disable DLL filter */
163 mem_timings.slow_dll_ctrl |= ((1 << 1) | (3 << 8));
164}
1/*
2 * linux/arch/arm/mach-omap2/sdrc2xxx.c
3 *
4 * SDRAM timing related functions for OMAP2xxx
5 *
6 * Copyright (C) 2005, 2008 Texas Instruments Inc.
7 * Copyright (C) 2005, 2008 Nokia Corporation
8 *
9 * Tony Lindgren <tony@atomide.com>
10 * Paul Walmsley
11 * Richard Woodruff <r-woodruff2@ti.com>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
18#include <linux/module.h>
19#include <linux/kernel.h>
20#include <linux/device.h>
21#include <linux/list.h>
22#include <linux/errno.h>
23#include <linux/delay.h>
24#include <linux/clk.h>
25#include <linux/io.h>
26
27#include "soc.h"
28#include "iomap.h"
29#include "common.h"
30#include "prm2xxx.h"
31#include "clock.h"
32#include "sdrc.h"
33#include "sram.h"
34
35/* Memory timing, DLL mode flags */
36#define M_DDR 1
37#define M_LOCK_CTRL (1 << 2)
38#define M_UNLOCK 0
39#define M_LOCK 1
40
41
42static struct memory_timings mem_timings;
43static u32 curr_perf_level = CORE_CLK_SRC_DPLL_X2;
44
45static u32 omap2xxx_sdrc_get_slow_dll_ctrl(void)
46{
47 return mem_timings.slow_dll_ctrl;
48}
49
50static u32 omap2xxx_sdrc_get_fast_dll_ctrl(void)
51{
52 return mem_timings.fast_dll_ctrl;
53}
54
55static u32 omap2xxx_sdrc_get_type(void)
56{
57 return mem_timings.m_type;
58}
59
60/*
61 * Check the DLL lock state, and return tue if running in unlock mode.
62 * This is needed to compensate for the shifted DLL value in unlock mode.
63 */
64u32 omap2xxx_sdrc_dll_is_unlocked(void)
65{
66 /* dlla and dllb are a set */
67 u32 dll_state = sdrc_read_reg(SDRC_DLLA_CTRL);
68
69 if ((dll_state & (1 << 2)) == (1 << 2))
70 return 1;
71 else
72 return 0;
73}
74
75/*
76 * 'level' is the value to store to CM_CLKSEL2_PLL.CORE_CLK_SRC.
77 * Practical values are CORE_CLK_SRC_DPLL (for CORE_CLK = DPLL_CLK) or
78 * CORE_CLK_SRC_DPLL_X2 (for CORE_CLK = * DPLL_CLK * 2)
79 *
80 * Used by the clock framework during CORE DPLL changes
81 */
82u32 omap2xxx_sdrc_reprogram(u32 level, u32 force)
83{
84 u32 dll_ctrl, m_type;
85 u32 prev = curr_perf_level;
86 unsigned long flags;
87
88 if ((curr_perf_level == level) && !force)
89 return prev;
90
91 if (level == CORE_CLK_SRC_DPLL)
92 dll_ctrl = omap2xxx_sdrc_get_slow_dll_ctrl();
93 else if (level == CORE_CLK_SRC_DPLL_X2)
94 dll_ctrl = omap2xxx_sdrc_get_fast_dll_ctrl();
95 else
96 return prev;
97
98 m_type = omap2xxx_sdrc_get_type();
99
100 local_irq_save(flags);
101 /*
102 * XXX These calls should be abstracted out through a
103 * prm2xxx.c function
104 */
105 if (cpu_is_omap2420())
106 writel_relaxed(0xffff, OMAP2420_PRCM_VOLTSETUP);
107 else
108 writel_relaxed(0xffff, OMAP2430_PRCM_VOLTSETUP);
109 omap2_sram_reprogram_sdrc(level, dll_ctrl, m_type);
110 curr_perf_level = level;
111 local_irq_restore(flags);
112
113 return prev;
114}
115
116/* Used by the clock framework during CORE DPLL changes */
117void omap2xxx_sdrc_init_params(u32 force_lock_to_unlock_mode)
118{
119 unsigned long dll_cnt;
120 u32 fast_dll = 0;
121
122 /* DDR = 1, SDR = 0 */
123 mem_timings.m_type = !((sdrc_read_reg(SDRC_MR_0) & 0x3) == 0x1);
124
125 /* 2422 es2.05 and beyond has a single SIP DDR instead of 2 like others.
126 * In the case of 2422, its ok to use CS1 instead of CS0.
127 */
128 if (cpu_is_omap2422())
129 mem_timings.base_cs = 1;
130 else
131 mem_timings.base_cs = 0;
132
133 if (mem_timings.m_type != M_DDR)
134 return;
135
136 /* With DDR we need to determine the low frequency DLL value */
137 if (((mem_timings.fast_dll_ctrl & (1 << 2)) == M_LOCK_CTRL))
138 mem_timings.dll_mode = M_UNLOCK;
139 else
140 mem_timings.dll_mode = M_LOCK;
141
142 if (mem_timings.base_cs == 0) {
143 fast_dll = sdrc_read_reg(SDRC_DLLA_CTRL);
144 dll_cnt = sdrc_read_reg(SDRC_DLLA_STATUS) & 0xff00;
145 } else {
146 fast_dll = sdrc_read_reg(SDRC_DLLB_CTRL);
147 dll_cnt = sdrc_read_reg(SDRC_DLLB_STATUS) & 0xff00;
148 }
149 if (force_lock_to_unlock_mode) {
150 fast_dll &= ~0xff00;
151 fast_dll |= dll_cnt; /* Current lock mode */
152 }
153 /* set fast timings with DLL filter disabled */
154 mem_timings.fast_dll_ctrl = (fast_dll | (3 << 8));
155
156 /* No disruptions, DDR will be offline & C-ABI not followed */
157 omap2_sram_ddr_init(&mem_timings.slow_dll_ctrl,
158 mem_timings.fast_dll_ctrl,
159 mem_timings.base_cs,
160 force_lock_to_unlock_mode);
161 mem_timings.slow_dll_ctrl &= 0xff00; /* Keep lock value */
162
163 /* Turn status into unlock ctrl */
164 mem_timings.slow_dll_ctrl |=
165 ((mem_timings.fast_dll_ctrl & 0xF) | (1 << 2));
166
167 /* 90 degree phase for anything below 133MHz + disable DLL filter */
168 mem_timings.slow_dll_ctrl |= ((1 << 1) | (3 << 8));
169}