2 * linux/arch/arm/mach-omap2/memory.c
4 * Memory timing related functions for OMAP24XX
6 * Copyright (C) 2005 Texas Instruments Inc.
7 * Richard Woodruff <r-woodruff2@ti.com>
9 * Copyright (C) 2005 Nokia Corporation
10 * Tony Lindgren <tony@atomide.com>
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.
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>
27 #include <mach/common.h>
28 #include <mach/clock.h>
29 #include <mach/sram.h>
36 void __iomem *omap2_sdrc_base;
37 void __iomem *omap2_sms_base;
39 static struct memory_timings mem_timings;
40 static u32 curr_perf_level = CORE_CLK_SRC_DPLL_X2;
42 u32 omap2_memory_get_slow_dll_ctrl(void)
44 return mem_timings.slow_dll_ctrl;
47 u32 omap2_memory_get_fast_dll_ctrl(void)
49 return mem_timings.fast_dll_ctrl;
52 u32 omap2_memory_get_type(void)
54 return mem_timings.m_type;
58 * Check the DLL lock state, and return tue if running in unlock mode.
59 * This is needed to compensate for the shifted DLL value in unlock mode.
61 u32 omap2_dll_force_needed(void)
63 /* dlla and dllb are a set */
64 u32 dll_state = sdrc_read_reg(SDRC_DLLA_CTRL);
66 if ((dll_state & (1 << 2)) == (1 << 2))
73 * 'level' is the value to store to CM_CLKSEL2_PLL.CORE_CLK_SRC.
74 * Practical values are CORE_CLK_SRC_DPLL (for CORE_CLK = DPLL_CLK) or
75 * CORE_CLK_SRC_DPLL_X2 (for CORE_CLK = * DPLL_CLK * 2)
77 u32 omap2_reprogram_sdrc(u32 level, u32 force)
80 u32 prev = curr_perf_level;
83 if ((curr_perf_level == level) && !force)
86 if (level == CORE_CLK_SRC_DPLL) {
87 dll_ctrl = omap2_memory_get_slow_dll_ctrl();
88 } else if (level == CORE_CLK_SRC_DPLL_X2) {
89 dll_ctrl = omap2_memory_get_fast_dll_ctrl();
94 m_type = omap2_memory_get_type();
96 local_irq_save(flags);
97 __raw_writel(0xffff, OMAP24XX_PRCM_VOLTSETUP);
98 omap2_sram_reprogram_sdrc(level, dll_ctrl, m_type);
99 curr_perf_level = level;
100 local_irq_restore(flags);
105 #if !defined(CONFIG_ARCH_OMAP2)
106 void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
107 u32 base_cs, u32 force_unlock)
110 void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val,
116 void omap2_init_memory_params(u32 force_lock_to_unlock_mode)
118 unsigned long dll_cnt;
121 mem_timings.m_type = !((sdrc_read_reg(SDRC_MR_0) & 0x3) == 0x1); /* DDR = 1, SDR = 0 */
123 /* 2422 es2.05 and beyond has a single SIP DDR instead of 2 like others.
124 * In the case of 2422, its ok to use CS1 instead of CS0.
126 if (cpu_is_omap2422())
127 mem_timings.base_cs = 1;
129 mem_timings.base_cs = 0;
131 if (mem_timings.m_type != M_DDR)
134 /* With DDR we need to determine the low frequency DLL value */
135 if (((mem_timings.fast_dll_ctrl & (1 << 2)) == M_LOCK_CTRL))
136 mem_timings.dll_mode = M_UNLOCK;
138 mem_timings.dll_mode = M_LOCK;
140 if (mem_timings.base_cs == 0) {
141 fast_dll = sdrc_read_reg(SDRC_DLLA_CTRL);
142 dll_cnt = sdrc_read_reg(SDRC_DLLA_STATUS) & 0xff00;
144 fast_dll = sdrc_read_reg(SDRC_DLLB_CTRL);
145 dll_cnt = sdrc_read_reg(SDRC_DLLB_STATUS) & 0xff00;
147 if (force_lock_to_unlock_mode) {
149 fast_dll |= dll_cnt; /* Current lock mode */
151 /* set fast timings with DLL filter disabled */
152 mem_timings.fast_dll_ctrl = (fast_dll | (3 << 8));
154 /* No disruptions, DDR will be offline & C-ABI not followed */
155 omap2_sram_ddr_init(&mem_timings.slow_dll_ctrl,
156 mem_timings.fast_dll_ctrl,
158 force_lock_to_unlock_mode);
159 mem_timings.slow_dll_ctrl &= 0xff00; /* Keep lock value */
161 /* Turn status into unlock ctrl */
162 mem_timings.slow_dll_ctrl |=
163 ((mem_timings.fast_dll_ctrl & 0xF) | (1 << 2));
165 /* 90 degree phase for anything below 133Mhz + disable DLL filter */
166 mem_timings.slow_dll_ctrl |= ((1 << 1) | (3 << 8));
169 void __init omap2_set_globals_memory(struct omap_globals *omap2_globals)
171 omap2_sdrc_base = omap2_globals->sdrc;
172 omap2_sms_base = omap2_globals->sms;
175 /* turn on smart idle modes for SDRAM scheduler and controller */
176 void __init omap2_init_memory(void)
180 if (!cpu_is_omap2420())
183 l = sms_read_reg(SMS_SYSCONFIG);
186 sms_write_reg(l, SMS_SYSCONFIG);
188 l = sdrc_read_reg(SDRC_SYSCONFIG);
191 sdrc_write_reg(l, SDRC_SYSCONFIG);