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-rw-r--r--board/tqm85xx/sdram.c226
1 files changed, 226 insertions, 0 deletions
diff --git a/board/tqm85xx/sdram.c b/board/tqm85xx/sdram.c
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+/*
+ * (C) Copyright 2005
+ * Stefan Roese, DENX Software Engineering, sr@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+
+#include <common.h>
+#include <asm/processor.h>
+#include <asm/immap_85xx.h>
+#include <asm/processor.h>
+#include <asm/mmu.h>
+#include <spd.h>
+
+struct sdram_conf_s {
+ unsigned long size;
+ unsigned long reg;
+};
+
+typedef struct sdram_conf_s sdram_conf_t;
+
+sdram_conf_t ddr_cs_conf[] = {
+ {(512 << 20), 0x80000202}, /* 512MB, 14x10(4) */
+ {(256 << 20), 0x80000102}, /* 256MB, 13x10(4) */
+ {(128 << 20), 0x80000101}, /* 128MB, 13x9(4) */
+ {(64 << 20), 0x80000001}, /* 64MB, 12x9(4) */
+};
+
+#define N_DDR_CS_CONF (sizeof(ddr_cs_conf) / sizeof(ddr_cs_conf[0]))
+
+int cas_latency(void);
+
+/*
+ * Autodetect onboard DDR SDRAM on 85xx platforms
+ *
+ * NOTE: Some of the hardcoded values are hardware dependant,
+ * so this should be extended for other future boards
+ * using this routine!
+ */
+long int sdram_setup(int casl)
+{
+ int i;
+ volatile immap_t *immap = (immap_t *) CFG_IMMR;
+ volatile ccsr_ddr_t *ddr = &immap->im_ddr;
+ unsigned long cfg_ddr_timing1;
+ unsigned long cfg_ddr_mode;
+
+ /*
+ * Disable memory controller.
+ */
+ ddr->cs0_config = 0;
+ ddr->sdram_cfg = 0;
+
+ switch (casl) {
+ case 20:
+ cfg_ddr_timing1 = 0x47405331 | (3 << 16);
+ cfg_ddr_mode = 0x40020002 | (2 << 4);
+ break;
+
+ case 25:
+ cfg_ddr_timing1 = 0x47405331 | (4 << 16);
+ cfg_ddr_mode = 0x40020002 | (6 << 4);
+ break;
+
+ case 30:
+ default:
+ cfg_ddr_timing1 = 0x47405331 | (5 << 16);
+ cfg_ddr_mode = 0x40020002 | (3 << 4);
+ break;
+ }
+
+ ddr->cs0_bnds = (ddr_cs_conf[0].size - 1) >> 24;
+ ddr->cs0_config = ddr_cs_conf[0].reg;
+ ddr->timing_cfg_1 = cfg_ddr_timing1;
+ ddr->timing_cfg_2 = 0x00000800; /* P9-45,may need tuning */
+ ddr->sdram_mode = cfg_ddr_mode;
+ ddr->sdram_interval = 0x05160100; /* autocharge,no open page */
+ ddr->err_disable = 0x0000000D;
+
+ asm ("sync;isync;msync");
+ udelay(1000);
+
+ ddr->sdram_cfg = 0xc2000000; /* unbuffered,no DYN_PWR */
+ asm ("sync; isync; msync");
+ udelay(1000);
+
+ for (i=0; i<N_DDR_CS_CONF; i++) {
+ ddr->cs0_config = ddr_cs_conf[i].reg;
+
+ if (get_ram_size(0, ddr_cs_conf[i].size) == ddr_cs_conf[i].size) {
+ /*
+ * OK, size detected -> all done
+ */
+ return ddr_cs_conf[i].size;
+ }
+ }
+
+ return 0; /* nothing found ! */
+}
+
+void board_add_ram_info(int use_default)
+{
+ int casl;
+
+ if (use_default)
+ casl = CONFIG_DDR_DEFAULT_CL;
+ else
+ casl = cas_latency();
+
+ puts(" (CL=");
+ switch (casl) {
+ case 20:
+ puts("2)");
+ break;
+
+ case 25:
+ puts("2.5)");
+ break;
+
+ case 30:
+ puts("3)");
+ break;
+ }
+}
+
+long int initdram (int board_type)
+{
+ long dram_size = 0;
+ int casl;
+
+#if defined(CONFIG_DDR_DLL)
+ /*
+ * This DLL-Override only used on TQM8540 and TQM8560
+ */
+ {
+ volatile immap_t *immap = (immap_t *) CFG_IMMR;
+ volatile ccsr_gur_t *gur= &immap->im_gur;
+ int i,x;
+
+ x = 10;
+
+ /*
+ * Work around to stabilize DDR DLL
+ */
+ gur->ddrdllcr = 0x81000000;
+ asm("sync;isync;msync");
+ udelay (200);
+ while (gur->ddrdllcr != 0x81000100) {
+ gur->devdisr = gur->devdisr | 0x00010000;
+ asm("sync;isync;msync");
+ for (i=0; i<x; i++)
+ ;
+ gur->devdisr = gur->devdisr & 0xfff7ffff;
+ asm("sync;isync;msync");
+ x++;
+ }
+ }
+#endif
+
+ casl = cas_latency();
+ dram_size = sdram_setup(casl);
+ if ((dram_size == 0) && (casl != CONFIG_DDR_DEFAULT_CL)) {
+ /*
+ * Try again with default CAS latency
+ */
+ puts("Problem with CAS lantency");
+ board_add_ram_info(1);
+ puts(", using default CL!\n");
+ casl = CONFIG_DDR_DEFAULT_CL;
+ dram_size = sdram_setup(casl);
+ puts(" ");
+ }
+
+ return dram_size;
+}
+
+#if defined(CFG_DRAM_TEST)
+int testdram (void)
+{
+ uint *pstart = (uint *) CFG_MEMTEST_START;
+ uint *pend = (uint *) CFG_MEMTEST_END;
+ uint *p;
+
+ printf ("SDRAM test phase 1:\n");
+ for (p = pstart; p < pend; p++)
+ *p = 0xaaaaaaaa;
+
+ for (p = pstart; p < pend; p++) {
+ if (*p != 0xaaaaaaaa) {
+ printf ("SDRAM test fails at: %08x\n", (uint) p);
+ return 1;
+ }
+ }
+
+ printf ("SDRAM test phase 2:\n");
+ for (p = pstart; p < pend; p++)
+ *p = 0x55555555;
+
+ for (p = pstart; p < pend; p++) {
+ if (*p != 0x55555555) {
+ printf ("SDRAM test fails at: %08x\n", (uint) p);
+ return 1;
+ }
+ }
+
+ printf ("SDRAM test passed.\n");
+ return 0;
+}
+#endif