2 * Functions related to OMAP3 SDRC.
4 * This file has been created after exctracting and consolidating
5 * the SDRC related content from mem.c and board.c, also created
6 * generic init function (mem_init).
8 * Copyright (C) 2004-2010
9 * Texas Instruments Incorporated - http://www.ti.com/
12 * Vaibhav Hiremath <hvaibhav@ti.com>
14 * Original implementation by (mem.c, board.c) :
15 * Sunil Kumar <sunilsaini05@gmail.com>
16 * Shashi Ranjan <shashiranjanmca05@gmail.com>
17 * Manikandan Pillai <mani.pillai@ti.com>
19 * This program is free software; you can redistribute it and/or
20 * modify it under the terms of the GNU General Public License as
21 * published by the Free Software Foundation; either version 2 of
22 * the License, or (at your option) any later version.
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
29 * You should have received a copy of the GNU General Public License
30 * along with this program; if not, write to the Free Software
31 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
37 #include <asm/arch/mem.h>
38 #include <asm/arch/sys_proto.h>
40 extern omap3_sysinfo sysinfo;
42 static struct sdrc *sdrc_base = (struct sdrc *)OMAP34XX_SDRC_BASE;
46 * - Return 1 if mem type in use is SDR
50 if (readl(&sdrc_base->cs[CS0].mr) == SDRC_MR_0_SDR)
56 * make_cs1_contiguous -
57 * - For es2 and above remap cs1 behind cs0 to allow command line
58 * mem=xyz use all memory with out discontinuous support compiled in.
59 * Could do it at the ATAG, but there really is two banks...
60 * - Called as part of 2nd phase DDR init.
62 void make_cs1_contiguous(void)
64 u32 size, a_add_low, a_add_high;
66 size = get_sdr_cs_size(CS0);
67 size >>= 25; /* divide by 32 MiB to find size to offset CS1 */
68 a_add_high = (size & 3) << 8; /* set up low field */
69 a_add_low = (size & 0x3C) >> 2; /* set up high field */
70 writel((a_add_high | a_add_low), &sdrc_base->cs_cfg);
77 * - Get size of chip select 0/1
79 u32 get_sdr_cs_size(u32 cs)
83 /* get ram size field */
84 size = readl(&sdrc_base->cs[cs].mcfg) >> 8;
85 size &= 0x3FF; /* remove unwanted bits */
86 size <<= 21; /* multiply by 2 MiB to find size in MB */
92 * - Get offset of cs from cs0 start
94 u32 get_sdr_cs_offset(u32 cs)
101 offset = readl(&sdrc_base->cs_cfg);
102 offset = (offset & 15) << 27 | (offset & 0x30) << 17;
109 * - Initialize the SDRAM for use.
110 * - code called once in C-Stack only context for CS0 and a possible 2nd
111 * time depending on memory configuration from stack+global context
113 void do_sdrc_init(u32 cs, u32 early)
115 struct sdrc_actim *sdrc_actim_base0, *sdrc_actim_base1;
118 /* reset sdrc controller */
119 writel(SOFTRESET, &sdrc_base->sysconfig);
120 wait_on_value(RESETDONE, RESETDONE, &sdrc_base->status,
122 writel(0, &sdrc_base->sysconfig);
124 /* setup sdrc to ball mux */
125 writel(SDRC_SHARING, &sdrc_base->sharing);
127 /* Disable Power Down of CKE cuz of 1 CKE on combo part */
128 writel(WAKEUPPROC | SRFRONRESET | PAGEPOLICY_HIGH,
131 writel(ENADLL | DLLPHASE_90, &sdrc_base->dlla_ctrl);
136 * SDRC timings are set up by x-load or config header
137 * We don't need to redo them here.
138 * Older x-loads configure only CS0
139 * configure CS1 to handle this ommission
142 sdrc_actim_base0 = (struct sdrc_actim *)SDRC_ACTIM_CTRL0_BASE;
143 sdrc_actim_base1 = (struct sdrc_actim *)SDRC_ACTIM_CTRL1_BASE;
144 writel(readl(&sdrc_base->cs[CS0].mcfg),
145 &sdrc_base->cs[CS1].mcfg);
146 writel(readl(&sdrc_base->cs[CS0].rfr_ctrl),
147 &sdrc_base->cs[CS1].rfr_ctrl);
148 writel(readl(&sdrc_actim_base0->ctrla),
149 &sdrc_actim_base1->ctrla);
150 writel(readl(&sdrc_actim_base0->ctrlb),
151 &sdrc_actim_base1->ctrlb);
155 * Test ram in this bank
156 * Disable if bad or not present
159 writel(0, &sdrc_base->cs[cs].mcfg);
164 * - Sets uboots idea of sdram size
166 #if defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
169 DECLARE_GLOBAL_DATA_PTR;
170 unsigned int size0 = 0, size1 = 0;
172 size0 = get_sdr_cs_size(CS0);
174 * If a second bank of DDR is attached to CS1 this is
175 * where it can be started. Early init code will init
178 if ((sysinfo.mtype == DDR_COMBO) || (sysinfo.mtype == DDR_STACKED)) {
179 do_sdrc_init(CS1, NOT_EARLY);
180 make_cs1_contiguous();
182 size1 = get_sdr_cs_size(CS1);
185 gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
186 gd->bd->bi_dram[0].size = size0;
187 gd->bd->bi_dram[1].start = PHYS_SDRAM_1 + get_sdr_cs_offset(CS1);
188 gd->bd->bi_dram[1].size = size1;
195 DECLARE_GLOBAL_DATA_PTR;
196 unsigned int size0 = 0, size1 = 0;
198 size0 = get_sdr_cs_size(CS0);
200 * If a second bank of DDR is attached to CS1 this is
201 * where it can be started. Early init code will init
204 if ((sysinfo.mtype == DDR_COMBO) || (sysinfo.mtype == DDR_STACKED)) {
205 do_sdrc_init(CS1, NOT_EARLY);
206 make_cs1_contiguous();
208 size1 = get_sdr_cs_size(CS1);
210 gd->ram_size = size0 + size1;
215 void dram_init_banksize (void)
217 DECLARE_GLOBAL_DATA_PTR;
218 unsigned int size0 = 0, size1 = 0;
220 size0 = get_sdr_cs_size(CS0);
221 size1 = get_sdr_cs_size(CS1);
223 gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
224 gd->bd->bi_dram[0].size = size0;
225 gd->bd->bi_dram[1].start = PHYS_SDRAM_1 + get_sdr_cs_offset(CS1);
226 gd->bd->bi_dram[1].size = size1;
232 * - Init the sdrc chip,
233 * - Selects CS0 and CS1,
237 /* only init up first bank here */
238 do_sdrc_init(CS0, EARLY_INIT);