3 * Sam Song, IEMC. SHU, samsongshu@yahoo.com.cn
5 * SPDX-License-Identifier: GPL-2.0+
10 * U-Boot port on RPXlite DW board : RPXlite_DW or LITE_DW
11 * Tested on working at 64MHz(CPU)/32MHz(BUS),48MHz/24MHz
12 * with 64MB, 2 SDRAM Micron chips,MT48LC16M16A2-75.
18 /* ------------------------------------------------------------------------- */
19 static long int dram_size (long int, long int *, long int);
20 /* ------------------------------------------------------------------------- */
22 #define _NOT_USED_ 0xFFFFCC25
24 const uint sdram_table[] =
27 * Single Read. (Offset 00h in UPMA RAM)
29 0x0F03CC04, 0x00ACCC24, 0x1FF74C20, /* last */
30 _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
34 * Burst Read. (Offset 08h in UPMA RAM)
36 0x0F03CC04, 0x00ACCC24, 0x00FFCC20, 0x00FFCC20,
37 0x01FFCC20, 0x1FF74C20, /* last */
38 _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
39 _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
40 _NOT_USED_, _NOT_USED_,
43 * Single Write. (Offset 18h in UPMA RAM)
45 0x0F03CC02, 0x00AC0C24, 0x1FF74C25, /* last */
46 _NOT_USED_, _NOT_USED_, 0x0FA00C34,0x0FFFCC35,
50 * Burst Write. (Offset 20h in UPMA RAM)
52 0x0F03CC00, 0x00AC0C20, 0x00FFFC20, 0x00FFFC22,
53 0x01FFFC24, 0x1FF74C25, /* 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 * Refresh. (Offset 30h in UPMA RAM)
61 0x0FF0CC24, 0xFFFFCC24, _NOT_USED_, _NOT_USED_,
62 _NOT_USED_, _NOT_USED_, 0xEFFB8C34, 0x0FF74C34,
63 0x0FFACCB4, 0x0FF5CC34, 0x0FFFCC34, 0x0FFFCCB4,
64 /* INIT sequence RAM WORDS
65 * SDRAM Initialization (offset 0x36 in UPMA RAM)
66 * The above definition uses the remaining space
67 * to establish an initialization sequence,
68 * which is executed by a RUN command.
69 * The sequence is COMMAND INHIBIT(NOP),Precharge,
70 * Load Mode Register,NOP,Auto Refresh.
74 * Exception. (Offset 3Ch in UPMA RAM)
76 0x0FEA8C34, 0x1FB54C34, 0xFFFFCC34, _NOT_USED_
80 * Check Board Identity:
85 puts ("Board: RPXlite_DW\n") ;
89 /* ------------------------------------------------------------------------- */
91 phys_size_t initdram (int board_type)
93 volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
94 volatile memctl8xx_t *memctl = &immap->im_memctl;
97 upmconfig(UPMA, (uint *)sdram_table, sizeof(sdram_table)/sizeof(uint));
99 /* Refresh clock prescalar */
100 memctl->memc_mptpr = CONFIG_SYS_MPTPR ;
102 memctl->memc_mar = 0x00000088;
104 /* Map controller banks 1 to the SDRAM bank */
105 memctl->memc_or1 = CONFIG_SYS_OR1_PRELIM;
106 memctl->memc_br1 = CONFIG_SYS_BR1_PRELIM;
108 memctl->memc_mamr = CONFIG_SYS_MAMR_9COL & (~(MAMR_PTAE)); /* no refresh yet */
109 /*Disable Periodic timer A. */
113 /* perform SDRAM initializsation sequence */
115 memctl->memc_mcr = 0x80002236; /* SDRAM bank 0 - refresh twice */
119 memctl->memc_mamr |= MAMR_PTAE; /* enable refresh */
121 /*Enable Periodic timer A */
125 /* Check Bank 0 Memory Size
129 size9 = dram_size (CONFIG_SYS_MAMR_9COL, SDRAM_BASE_PRELIM, SDRAM_MAX_SIZE);
135 memctl->memc_or1 = ((-size9) & 0xFFFF0000) | CONFIG_SYS_OR_TIMING_SDRAM;
142 void rpxlite_init (void)
145 *((uchar *) BCSR0) |= BCSR0_ENNVRAM;
149 * Check memory range for valid RAM. A simple memory test determines
150 * the actually available RAM size between addresses `base' and
151 * `base + maxsize'. Some (not all) hardware errors are detected:
152 * - short between address lines
153 * - short between data lines
155 static long int dram_size (long int mamr_value, long int *base,
158 volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
159 volatile memctl8xx_t *memctl = &immap->im_memctl;
161 memctl->memc_mamr = mamr_value;
163 return (get_ram_size (base, maxsize));