3 * Sam Song, IEMC. SHU, samsongshu@yahoo.com.cn
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
26 * U-Boot port on RPXlite DW board : RPXlite_DW or LITE_DW
27 * Tested on working at 64MHz(CPU)/32MHz(BUS),48MHz/24MHz
28 * with 64MB, 2 SDRAM Micron chips,MT48LC16M16A2-75.
34 /* ------------------------------------------------------------------------- */
35 static long int dram_size (long int, long int *, long int);
36 /* ------------------------------------------------------------------------- */
38 #define _NOT_USED_ 0xFFFFCC25
40 const uint sdram_table[] =
43 * Single Read. (Offset 00h in UPMA RAM)
45 0x0F03CC04, 0x00ACCC24, 0x1FF74C20, /* last */
46 _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
50 * Burst Read. (Offset 08h in UPMA RAM)
52 0x0F03CC04, 0x00ACCC24, 0x00FFCC20, 0x00FFCC20,
53 0x01FFCC20, 0x1FF74C20, /* last */
54 _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
55 _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
56 _NOT_USED_, _NOT_USED_,
59 * Single Write. (Offset 18h in UPMA RAM)
61 0x0F03CC02, 0x00AC0C24, 0x1FF74C25, /* last */
62 _NOT_USED_, _NOT_USED_, 0x0FA00C34,0x0FFFCC35,
66 * Burst Write. (Offset 20h in UPMA RAM)
68 0x0F03CC00, 0x00AC0C20, 0x00FFFC20, 0x00FFFC22,
69 0x01FFFC24, 0x1FF74C25, /* last */
70 _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
71 _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
72 _NOT_USED_, _NOT_USED_,
75 * Refresh. (Offset 30h in UPMA RAM)
77 0x0FF0CC24, 0xFFFFCC24, _NOT_USED_, _NOT_USED_,
78 _NOT_USED_, _NOT_USED_, 0xEFFB8C34, 0x0FF74C34,
79 0x0FFACCB4, 0x0FF5CC34, 0x0FFFCC34, 0x0FFFCCB4,
80 /* INIT sequence RAM WORDS
81 * SDRAM Initialization (offset 0x36 in UPMA RAM)
82 * The above definition uses the remaining space
83 * to establish an initialization sequence,
84 * which is executed by a RUN command.
85 * The sequence is COMMAND INHIBIT(NOP),Precharge,
86 * Load Mode Register,NOP,Auto Refresh.
90 * Exception. (Offset 3Ch in UPMA RAM)
92 0x0FEA8C34, 0x1FB54C34, 0xFFFFCC34, _NOT_USED_
96 * Check Board Identity:
101 puts ("Board: RPXlite_DW\n") ;
105 /* ------------------------------------------------------------------------- */
107 phys_size_t initdram (int board_type)
109 volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
110 volatile memctl8xx_t *memctl = &immap->im_memctl;
113 upmconfig(UPMA, (uint *)sdram_table, sizeof(sdram_table)/sizeof(uint));
115 /* Refresh clock prescalar */
116 memctl->memc_mptpr = CONFIG_SYS_MPTPR ;
118 memctl->memc_mar = 0x00000088;
120 /* Map controller banks 1 to the SDRAM bank */
121 memctl->memc_or1 = CONFIG_SYS_OR1_PRELIM;
122 memctl->memc_br1 = CONFIG_SYS_BR1_PRELIM;
124 memctl->memc_mamr = CONFIG_SYS_MAMR_9COL & (~(MAMR_PTAE)); /* no refresh yet */
125 /*Disable Periodic timer A. */
129 /* perform SDRAM initializsation sequence */
131 memctl->memc_mcr = 0x80002236; /* SDRAM bank 0 - refresh twice */
135 memctl->memc_mamr |= MAMR_PTAE; /* enable refresh */
137 /*Enable Periodic timer A */
141 /* Check Bank 0 Memory Size
145 size9 = dram_size (CONFIG_SYS_MAMR_9COL, SDRAM_BASE_PRELIM, SDRAM_MAX_SIZE);
151 memctl->memc_or1 = ((-size9) & 0xFFFF0000) | CONFIG_SYS_OR_TIMING_SDRAM;
158 void rpxlite_init (void)
161 *((uchar *) BCSR0) |= BCSR0_ENNVRAM;
165 * Check memory range for valid RAM. A simple memory test determines
166 * the actually available RAM size between addresses `base' and
167 * `base + maxsize'. Some (not all) hardware errors are detected:
168 * - short between address lines
169 * - short between data lines
171 static long int dram_size (long int mamr_value, long int *base,
174 volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
175 volatile memctl8xx_t *memctl = &immap->im_memctl;
177 memctl->memc_mamr = mamr_value;
179 return (get_ram_size (base, maxsize));