6 * Simple Network Magic Corporation, dnevil@snmc.com
9 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
11 * See file CREDITS for list of people who contributed to this
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License as
16 * published by the Free Software Foundation; either version 2 of
17 * the License, or (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
31 #include <asm/u-boot.h>
35 /* ------------------------------------------------------------------------- */
37 static long int dram_size (long int, long int *, long int);
39 /* ------------------------------------------------------------------------- */
41 const uint sdram_table[] =
44 * Single Read. (Offset 0 in UPMA RAM)
46 0x0f07cc04, 0x00adcc04, 0x00a74c00, 0x00bfcc04,
47 0x1fffcc05, 0xffffcc05, 0xffffcc05, 0xffffcc05,
49 * Burst Read. (Offset 8 in UPMA RAM)
51 0x0ff7fc04, 0x0ffffc04, 0x00bdfc04, 0x00fffc00,
52 0x00fffc00, 0x00fffc00, 0x0ff77c00, 0x1ffffc05,
53 0x1ffffc05, 0x1ffffc05, 0x1ffffc05, 0x1ffffc05,
54 0x1ffffc05, 0x1ffffc05, 0x1ffffc05, 0x1ffffc05,
56 * Single Write. (Offset 18 in UPMA RAM)
58 0x0f07cc04, 0x0fafcc00, 0x01ad0c04, 0x1ff74c07,
59 0xffffcc05, 0xffffcc05, 0xffffcc05, 0xffffcc05,
61 * Burst Write. (Offset 20 in UPMA RAM)
63 0x0ff7fc04, 0x0ffffc00, 0x00bd7c00, 0x00fffc00,
64 0x00fffc00, 0x00fffc00, 0x0ffffc04, 0x0ff77c04,
65 0x1ffffc05, 0x1ffffc05, 0x1ffffc05, 0x1ffffc05,
66 0x1ffffc05, 0x1ffffc05, 0x1ffffc05, 0x1ffffc05,
68 * Refresh (Offset 30 in UPMA RAM)
70 0xffffcc04, 0x1ff5cc84, 0xffffcc04, 0xffffcc04,
71 0xffffcc84, 0xffffcc05, 0xffffcc04, 0xffffcc04,
72 0xffffcc04, 0xffffcc04, 0xffffcc04, 0xffffcc04,
74 * Exception. (Offset 3c in UPMA RAM)
76 0x1ff74c04, 0xffffcc07, 0xffffaa34, 0x1fb54a37
79 /* ------------------------------------------------------------------------- */
83 * Check Board Identity:
85 * Test ID string (QS850, QS823, ...)
89 #if defined(CONFIG_QS850)
90 #define BOARD_IDENTITY "QS850"
91 #elif defined(CONFIG_QS823)
92 #define BOARD_IDENTITY "QS823"
94 #define BOARD_IDENTITY "QS???"
103 i = getenv_r("serial#", buf, sizeof(buf));
104 s = (i>0) ? buf : NULL;
106 if (!s || strncmp(s, BOARD_IDENTITY, 5)) {
107 puts ("### No HW ID - assuming " BOARD_IDENTITY);
123 /* ------------------------------------------------------------------------- */
124 /* SDRAM Mode Register Definitions */
126 /* Set SDRAM Burst Length to 4 (010) */
127 /* See Motorola MPC850 User Manual, Page 13-14 */
128 #define SDRAM_BURST_LENGTH (2)
130 /* Set Wrap Type to Sequential (0) */
131 /* See Motorola MPC850 User Manual, Page 13-14 */
132 #define SDRAM_WRAP_TYPE (0 << 3)
134 /* Set /CAS Latentcy to 2 clocks */
135 #define SDRAM_CAS_LATENTCY (2 << 4)
137 /* The Mode Register value must be shifted left by 2, since it is */
138 /* placed on the address bus, and the 2 LSBs are ignored for 32-bit accesses */
139 #define SDRAM_MODE_REG ((SDRAM_BURST_LENGTH|SDRAM_WRAP_TYPE|SDRAM_CAS_LATENTCY) << 2)
141 #define UPMA_RUN(loops,index) (0x80002000 + (loops<<8) + index)
143 /* Please note a value of zero = 16 loops */
144 #define REFRESH_INIT_LOOPS (0)
147 phys_size_t initdram (int board_type)
149 volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
150 volatile memctl8xx_t *memctl = &immap->im_memctl;
153 upmconfig(UPMA, (uint *)sdram_table, sizeof(sdram_table)/sizeof(uint));
156 * Prescaler for refresh
158 memctl->memc_mptpr = CONFIG_SYS_MPTPR;
161 * Map controller bank 1 to the SDRAM address
163 memctl->memc_or1 = CONFIG_SYS_OR1;
164 memctl->memc_br1 = CONFIG_SYS_BR1;
167 /* perform SDRAM initialization sequence */
168 memctl->memc_mamr = CONFIG_SYS_16M_MAMR;
171 /* Program the SDRAM's Mode Register */
172 memctl->memc_mar = SDRAM_MODE_REG;
174 /* Run the Prechard Pattern at 0x3C */
175 memctl->memc_mcr = UPMA_RUN(1,0x3c);
178 /* Run the Refresh program residing at MAD index 0x30 */
179 /* This contains the CBR Refresh command with a loop */
180 /* The SDRAM must be refreshed at least 2 times */
181 /* Please note a value of zero = 16 loops */
182 memctl->memc_mcr = UPMA_RUN(REFRESH_INIT_LOOPS,0x30);
185 /* Run the Exception program residing at MAD index 0x3E */
186 /* This contains the Write Mode Register command */
187 /* The Write Mode Register command uses the value written to MAR */
188 memctl->memc_mcr = UPMA_RUN(1,0x3e);
193 * Check for 32M SDRAM Memory Size
195 size = dram_size(CONFIG_SYS_32M_MAMR|MAMR_PTAE,
196 (long *)SDRAM_BASE, SDRAM_32M_MAX_SIZE);
200 * Check for 16M SDRAM Memory Size
202 if (size != SDRAM_32M_MAX_SIZE) {
203 size = dram_size(CONFIG_SYS_16M_MAMR|MAMR_PTAE,
204 (long *)SDRAM_BASE, SDRAM_16M_MAX_SIZE);
212 /* ------------------------------------------------------------------------- */
215 * Check memory range for valid RAM. A simple memory test determines
216 * the actually available RAM size between addresses `base' and
217 * `base + maxsize'. Some (not all) hardware errors are detected:
218 * - short between address lines
219 * - short between data lines
222 static long int dram_size (long int mamr_value, long int *base, long int maxsize)
224 volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
225 volatile memctl8xx_t *memctl = &immap->im_memctl;
227 memctl->memc_mamr = mamr_value;
229 return (get_ram_size(base, maxsize));