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Diffstat (limited to 'board/tqc/tqm85xx/sdram.c')
-rw-r--r--board/tqc/tqm85xx/sdram.c371
1 files changed, 371 insertions, 0 deletions
diff --git a/board/tqc/tqm85xx/sdram.c b/board/tqc/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>
+
+struct sdram_conf_s {
+ unsigned long size;
+ unsigned long reg;
+#ifdef CONFIG_TQM8548
+ unsigned long refresh;
+#endif /* CONFIG_TQM8548 */
+};
+
+typedef struct sdram_conf_s sdram_conf_t;
+
+#ifdef CONFIG_TQM8548
+sdram_conf_t ddr_cs_conf[] = {
+ {(512 << 20), 0x80044102, 0x0001A000}, /* 512MB, 13x10(4) */
+ {(256 << 20), 0x80040102, 0x00014000}, /* 256MB, 13x10(4) */
+ {(128 << 20), 0x80040101, 0x0000C000}, /* 128MB, 13x9(4) */
+};
+#else /* !CONFIG_TQM8548 */
+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) */
+};
+#endif /* CONFIG_TQM8548 */
+
+#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 ccsr_ddr_t *ddr = (void *)(CFG_MPC85xx_DDR_ADDR);
+#ifdef CONFIG_TQM8548
+ volatile ccsr_gur_t *gur = (void *)(CFG_MPC85xx_GUTS_ADDR);
+#else /* !CONFIG_TQM8548 */
+ unsigned long cfg_ddr_timing1;
+ unsigned long cfg_ddr_mode;
+#endif /* CONFIG_TQM8548 */
+
+ /*
+ * Disable memory controller.
+ */
+ ddr->cs0_config = 0;
+ ddr->sdram_cfg = 0;
+
+#ifdef CONFIG_TQM8548
+ ddr->cs0_bnds = (ddr_cs_conf[0].size - 1) >> 24;
+ ddr->cs0_config = ddr_cs_conf[0].reg;
+ ddr->timing_cfg_3 = 0x00010000;
+
+ /* TIMING CFG 1, 533MHz
+ * PRETOACT: 4 Clocks
+ * ACTTOPRE: 12 Clocks
+ * ACTTORW: 4 Clocks
+ * CASLAT: 4 Clocks
+ * REFREC: 34 Clocks
+ * WRREC: 4 Clocks
+ * ACTTOACT: 3 Clocks
+ * WRTORD: 2 Clocks
+ */
+ ddr->timing_cfg_1 = 0x4C47A432;
+
+ /* TIMING CFG 2, 533MHz
+ * ADD_LAT: 3 Clocks
+ * CPO: READLAT + 1
+ * WR_LAT: 3 Clocks
+ * RD_TO_PRE: 2 Clocks
+ * WR_DATA_DELAY: 1/2 Clock
+ * CKE_PLS: 1 Clock
+ * FOUR_ACT: 13 Clocks
+ */
+ ddr->timing_cfg_2 = 0x3318484D;
+
+ /* DDR SDRAM Mode, 533MHz
+ * MRS: Extended Mode Register
+ * OUT: Outputs enabled
+ * RDQS: no
+ * DQS: enabled
+ * OCD: default state
+ * RTT: 75 Ohms
+ * Posted CAS: 3 Clocks
+ * ODS: reduced strength
+ * DLL: enabled
+ * MR: Mode Register
+ * PD: fast exit
+ * WR: 4 Clocks
+ * DLL: no DLL reset
+ * TM: normal
+ * CAS latency: 4 Clocks
+ * BT: sequential
+ * Burst length: 4
+ */
+ ddr->sdram_mode = 0x439E0642;
+
+ /* DDR SDRAM Interval, 533MHz
+ * REFINT: 1040 Clocks
+ * BSTOPRE: 256
+ */
+ ddr->sdram_interval = (1040 << 16) | 0x100;
+
+ /*
+ * workaround for erratum DD10 of MPC8458 family below rev. 2.0:
+ * DDR IO receiver must be set to an acceptable bias point by modifying
+ * a hidden register.
+ */
+ if (SVR_REV (get_svr ()) < 0x20) {
+ gur->ddrioovcr = 0x90000000; /* enable, VSEL 1.8V */
+ }
+
+ /* DDR SDRAM CFG 2
+ * FRC_SR: normal mode
+ * SR_IE: no self-refresh interrupt
+ * DLL_RST_DIS: don't care, leave at reset value
+ * DQS_CFG: differential DQS signals
+ * ODT_CFG: assert ODT to internal IOs only during reads to DRAM
+ * LVWx_CFG: don't care, leave at reset value
+ * NUM_PR: 1 refresh will be issued at a time
+ * DM_CFG: don't care, leave at reset value
+ * D_INIT: no data initialization
+ */
+ ddr->sdram_cfg_2 = 0x04401000;
+
+ /* DDR SDRAM MODE 2
+ * MRS: Extended Mode Register 2
+ */
+ ddr->sdram_mode_2 = 0x8000C000;
+
+ /* DDR SDRAM CLK CNTL
+ * CLK_ADJUST: 1/2 Clock 0x02000000
+ * CLK_ADJUST: 5/8 Clock 0x02800000
+ */
+ ddr->sdram_clk_cntl = 0x02800000;
+
+ /* wait for clock stabilization */
+ asm ("sync;isync;msync");
+ udelay(1000);
+
+ /* DDR SDRAM CLK CNTL
+ * MEM_EN: enabled
+ * SREN: don't care, leave at reset value
+ * ECC_EN: no error report
+ * RD_EN: no register DIMMs
+ * SDRAM_TYPE: DDR2
+ * DYN_PWR: no power management
+ * 32_BE: don't care, leave at reset value
+ * 8_BE: 4 beat burst
+ * NCAP: don't care, leave at reset value
+ * 2T_EN: 1T Timing
+ * BA_INTLV_CTL: no interleaving
+ * x32_EN: x16 organization
+ * PCHB8: MA[10] for auto-precharge
+ * HSE: half strength for single and 2-layer stacks
+ * (full strength for 3- and 4-layer stacks no yet considered)
+ * MEM_HALT: no halt
+ * BI: automatic initialization
+ */
+ ddr->sdram_cfg = 0x83000008;
+ asm ("sync; isync; msync");
+ udelay(1000);
+
+#else /* !CONFIG_TQM8548 */
+ 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);
+#endif /* CONFIG_TQM8548 */
+
+ 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) {
+ /*
+ * size detected -> set Chip Select Bounds Register
+ */
+ ddr->cs0_bnds = (ddr_cs_conf[i].size - 1) >> 24;
+
+ break;
+ }
+ }
+
+#ifdef CONFIG_TQM8548
+ if (i < N_DDR_CS_CONF) {
+ /* Adjust refresh rate for DDR2 */
+
+ ddr->timing_cfg_3 = ddr_cs_conf[i].refresh & 0x00070000;
+
+ ddr->timing_cfg_1 = (ddr->timing_cfg_1 & 0xFFFF0FFF) |
+ (ddr_cs_conf[i].refresh & 0x0000F000);
+
+ return ddr_cs_conf[i].size;
+ }
+#endif /* CONFIG_TQM8548 */
+
+ /* return size if detected, else return 0 */
+ return (i < N_DDR_CS_CONF) ? ddr_cs_conf[i].size : 0;
+}
+
+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 ccsr_gur_t *gur = (void *)(CFG_MPC85xx_GUTS_ADDR);
+ 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
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