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-rw-r--r--cpu/ppc4xx/sdram.c298
-rw-r--r--cpu/ppc4xx/sdram.h78
2 files changed, 342 insertions, 34 deletions
diff --git a/cpu/ppc4xx/sdram.c b/cpu/ppc4xx/sdram.c
index e9548cd..c5ab017 100644
--- a/cpu/ppc4xx/sdram.c
+++ b/cpu/ppc4xx/sdram.c
@@ -1,7 +1,10 @@
/*
- * (C) Copyright 2005
+ * (C) Copyright 2005-2006
* Stefan Roese, DENX Software Engineering, sr@denx.de.
*
+ * (C) Copyright 2006
+ * DAVE Srl <www.dave-tech.it>
+ *
* (C) Copyright 2002-2004
* Stefan Roese, esd gmbh germany, stefan.roese@esd-electronics.com
*
@@ -27,28 +30,19 @@
#include <common.h>
#include <ppc4xx.h>
#include <asm/processor.h>
+#include "sdram.h"
#ifdef CONFIG_SDRAM_BANK0
-#define mtsdram0(reg, data) mtdcr(memcfga,reg);mtdcr(memcfgd,data)
-
-
-struct sdram_conf_s {
- unsigned long size;
- unsigned long reg;
-};
-
-typedef struct sdram_conf_s sdram_conf_t;
-
#ifndef CFG_SDRAM_TABLE
sdram_conf_t mb0cf[] = {
- {(128 << 20), 0x000A4001}, /* (0-128MB) Address Mode 3, 13x10(4) */
- {(64 << 20), 0x00084001}, /* (0-64MB) Address Mode 3, 13x9(4) */
- {(32 << 20), 0x00062001}, /* (0-32MB) Address Mode 2, 12x9(4) */
- {(16 << 20), 0x00046001}, /* (0-16MB) Address Mode 4, 12x8(4) */
- {(4 << 20), 0x00008001}, /* (0-4MB) Address Mode 5, 11x8(2) */
+ {(128 << 20), 13, 0x000A4001}, /* (0-128MB) Address Mode 3, 13x10(4) */
+ {(64 << 20), 13, 0x00084001}, /* (0-64MB) Address Mode 3, 13x9(4) */
+ {(32 << 20), 12, 0x00062001}, /* (0-32MB) Address Mode 2, 12x9(4) */
+ {(16 << 20), 12, 0x00046001}, /* (0-16MB) Address Mode 4, 12x8(4) */
+ {(4 << 20), 11, 0x00008001}, /* (0-4MB) Address Mode 5, 11x8(2) */
};
#else
sdram_conf_t mb0cf[] = CFG_SDRAM_TABLE;
@@ -59,31 +53,138 @@ sdram_conf_t mb0cf[] = CFG_SDRAM_TABLE;
#ifndef CONFIG_440
+#ifdef CFG_SDRAM_CASL
+static ulong ns2clks(ulong ns)
+{
+ ulong bus_period_x_10 = ONE_BILLION / (get_bus_freq(0) / 10);
+
+ return ((ns * 10) + bus_period_x_10) / bus_period_x_10;
+}
+#endif /* CFG_SDRAM_CASL */
+
+static ulong compute_sdtr1(ulong speed)
+{
+#ifdef CFG_SDRAM_CASL
+ ulong tmp;
+ ulong sdtr1 = 0;
+
+ /* CASL */
+ if (CFG_SDRAM_CASL < 2)
+ sdtr1 |= (1 << SDRAM0_TR_CASL);
+ else
+ if (CFG_SDRAM_CASL > 4)
+ sdtr1 |= (3 << SDRAM0_TR_CASL);
+ else
+ sdtr1 |= ((CFG_SDRAM_CASL-1) << SDRAM0_TR_CASL);
+
+ /* PTA */
+ tmp = ns2clks(CFG_SDRAM_PTA);
+ if ((tmp >= 2) && (tmp <= 4))
+ sdtr1 |= ((tmp-1) << SDRAM0_TR_PTA);
+ else
+ sdtr1 |= ((4-1) << SDRAM0_TR_PTA);
+
+ /* CTP */
+ tmp = ns2clks(CFG_SDRAM_CTP);
+ if ((tmp >= 2) && (tmp <= 4))
+ sdtr1 |= ((tmp-1) << SDRAM0_TR_CTP);
+ else
+ sdtr1 |= ((4-1) << SDRAM0_TR_CTP);
+
+ /* LDF */
+ tmp = ns2clks(CFG_SDRAM_LDF);
+ if ((tmp >= 2) && (tmp <= 4))
+ sdtr1 |= ((tmp-1) << SDRAM0_TR_LDF);
+ else
+ sdtr1 |= ((2-1) << SDRAM0_TR_LDF);
+
+ /* RFTA */
+ tmp = ns2clks(CFG_SDRAM_RFTA);
+ if ((tmp >= 4) && (tmp <= 10))
+ sdtr1 |= ((tmp-4) << SDRAM0_TR_RFTA);
+ else
+ sdtr1 |= ((10-4) << SDRAM0_TR_RFTA);
+
+ /* RCD */
+ tmp = ns2clks(CFG_SDRAM_RCD);
+ if ((tmp >= 2) && (tmp <= 4))
+ sdtr1 |= ((tmp-1) << SDRAM0_TR_RCD);
+ else
+ sdtr1 |= ((4-1) << SDRAM0_TR_RCD);
+
+ return sdtr1;
+#else /* CFG_SDRAM_CASL */
+ /*
+ * If no values are configured in the board config file
+ * use the default values, which seem to be ok for most
+ * boards.
+ *
+ * REMARK:
+ * For new board ports we strongly recommend to define the
+ * correct values for the used SDRAM chips in your board
+ * config file (see PPChameleonEVB.h)
+ */
+ if (speed > 100000000) {
+ /*
+ * 133 MHz SDRAM
+ */
+ return 0x01074015;
+ } else {
+ /*
+ * default: 100 MHz SDRAM
+ */
+ return 0x0086400d;
+ }
+#endif /* CFG_SDRAM_CASL */
+}
+
+/* refresh is expressed in ms */
+static ulong compute_rtr(ulong speed, ulong rows, ulong refresh)
+{
+#ifdef CFG_SDRAM_CASL
+ ulong tmp;
+
+ tmp = ((refresh*1000*1000) / (1 << rows)) * (speed / 1000);
+ tmp /= 1000000;
+
+ return ((tmp & 0x00003FF8) << 16);
+#else /* CFG_SDRAM_CASL */
+ if (speed > 100000000) {
+ /*
+ * 133 MHz SDRAM
+ */
+ return 0x07f00000;
+ } else {
+ /*
+ * default: 100 MHz SDRAM
+ */
+ return 0x05f00000;
+ }
+#endif /* CFG_SDRAM_CASL */
+}
+
/*
* Autodetect onboard SDRAM on 405 platforms
*/
void sdram_init(void)
{
+ ulong speed;
ulong sdtr1;
- ulong rtr;
int i;
- /*
- * Support for 100MHz and 133MHz SDRAM
- */
- if (get_bus_freq(0) > 100000000) {
- /*
- * 133 MHz SDRAM
- */
- sdtr1 = 0x01074015;
- rtr = 0x07f00000;
- } else {
- /*
- * default: 100 MHz SDRAM
- */
- sdtr1 = 0x0086400d;
- rtr = 0x05f00000;
- }
+ /*
+ * Determine SDRAM speed
+ */
+ speed = get_bus_freq(0); /* parameter not used on ppc4xx */
+
+ /*
+ * sdtr1 (register SDRAM0_TR) must take into account timings listed
+ * in SDRAM chip datasheet. rtr (register SDRAM0_RTR) must take into
+ * account actual SDRAM size. So we can set up sdtr1 according to what
+ * is specified in board configuration file while rtr dependds on SDRAM
+ * size we are assuming before detection.
+ */
+ sdtr1 = compute_sdtr1(speed);
for (i=0; i<N_MB0CF; i++) {
/*
@@ -96,7 +197,7 @@ void sdram_init(void)
*/
mtsdram0(mem_mb0cf, mb0cf[i].reg);
mtsdram0(mem_sdtr1, sdtr1);
- mtsdram0(mem_rtr, rtr);
+ mtsdram0(mem_rtr, compute_rtr(speed, mb0cf[i].rows, 64));
udelay(200);
@@ -120,6 +221,124 @@ void sdram_init(void)
#else /* CONFIG_440 */
+#define NUM_TRIES 64
+#define NUM_READS 10
+
+static void sdram_tr1_set(int ram_address, int* tr1_value)
+{
+ int i;
+ int j, k;
+ volatile unsigned int* ram_pointer = (unsigned int *)ram_address;
+ int first_good = -1, last_bad = 0x1ff;
+
+ unsigned long test[NUM_TRIES] = {
+ 0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF,
+ 0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF,
+ 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000,
+ 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000,
+ 0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555,
+ 0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555,
+ 0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA,
+ 0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA,
+ 0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A,
+ 0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A,
+ 0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5,
+ 0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5,
+ 0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA,
+ 0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA,
+ 0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55,
+ 0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55 };
+
+ /* go through all possible SDRAM0_TR1[RDCT] values */
+ for (i=0; i<=0x1ff; i++) {
+ /* set the current value for TR1 */
+ mtsdram(mem_tr1, (0x80800800 | i));
+
+ /* write values */
+ for (j=0; j<NUM_TRIES; j++) {
+ ram_pointer[j] = test[j];
+
+ /* clear any cache at ram location */
+ __asm__("dcbf 0,%0": :"r" (&ram_pointer[j]));
+ }
+
+ /* read values back */
+ for (j=0; j<NUM_TRIES; j++) {
+ for (k=0; k<NUM_READS; k++) {
+ /* clear any cache at ram location */
+ __asm__("dcbf 0,%0": :"r" (&ram_pointer[j]));
+
+ if (ram_pointer[j] != test[j])
+ break;
+ }
+
+ /* read error */
+ if (k != NUM_READS)
+ break;
+ }
+
+ /* we have a SDRAM0_TR1[RDCT] that is part of the window */
+ if (j == NUM_TRIES) {
+ if (first_good == -1)
+ first_good = i; /* found beginning of window */
+ } else { /* bad read */
+ /* if we have not had a good read then don't care */
+ if (first_good != -1) {
+ /* first failure after a good read */
+ last_bad = i-1;
+ break;
+ }
+ }
+ }
+
+ /* return the current value for TR1 */
+ *tr1_value = (first_good + last_bad) / 2;
+}
+
+
+#ifdef CONFIG_SDRAM_ECC
+static void ecc_init(ulong start, ulong size)
+{
+ ulong current_addr; /* current byte address */
+ ulong end_addr; /* end of memory region */
+ ulong addr_inc; /* address skip between writes */
+ ulong cfg0_reg; /* for restoring ECC state */
+
+ /*
+ * TODO: Enable dcache before running this test (speedup)
+ */
+
+ mfsdram(mem_cfg0, cfg0_reg);
+ mtsdram(mem_cfg0, (cfg0_reg & ~SDRAM_CFG0_MEMCHK) | SDRAM_CFG0_MEMCHK_GEN);
+
+ /*
+ * look at geometry of SDRAM (data width) to determine whether we
+ * can skip words when writing
+ */
+ if ((cfg0_reg & SDRAM_CFG0_DRAMWDTH) == SDRAM_CFG0_DRAMWDTH_32)
+ addr_inc = 4;
+ else
+ addr_inc = 8;
+
+ current_addr = start;
+ end_addr = start + size;
+
+ while (current_addr < end_addr) {
+ *((ulong *)current_addr) = 0x00000000;
+ current_addr += addr_inc;
+ }
+
+ /*
+ * TODO: Flush dcache and disable it again
+ */
+
+ /*
+ * Enable ecc checking and parity errors
+ */
+ mtsdram(mem_cfg0, (cfg0_reg & ~SDRAM_CFG0_MEMCHK) | SDRAM_CFG0_MEMCHK_CHK);
+}
+#endif
+
/*
* Autodetect onboard DDR SDRAM on 440 platforms
*
@@ -130,6 +349,7 @@ void sdram_init(void)
long int initdram(int board_type)
{
int i;
+ int tr1_bank1;
for (i=0; i<N_MB0CF; i++) {
/*
@@ -164,6 +384,16 @@ long int initdram(int board_type)
if (get_ram_size(0, mb0cf[i].size) == mb0cf[i].size) {
/*
+ * Optimize TR1 to current hardware environment
+ */
+ sdram_tr1_set(0x00000000, &tr1_bank1);
+ mtsdram(mem_tr1, (tr1_bank1 | 0x80800800));
+
+#ifdef CONFIG_SDRAM_ECC
+ ecc_init(0, mb0cf[i].size);
+#endif
+
+ /*
* OK, size detected -> all done
*/
return mb0cf[i].size;
diff --git a/cpu/ppc4xx/sdram.h b/cpu/ppc4xx/sdram.h
new file mode 100644
index 0000000..62b5442
--- /dev/null
+++ b/cpu/ppc4xx/sdram.h
@@ -0,0 +1,78 @@
+/*
+ * (C) Copyright 2006
+ * Stefan Roese, DENX Software Engineering, sr@denx.de.
+ *
+ * (C) Copyright 2006
+ * DAVE Srl <www.dave-tech.it>
+ *
+ * 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
+ */
+
+#ifndef _SDRAM_H_
+#define _SDRAM_H_
+
+#include <config.h>
+
+#define mtsdram0(reg, data) mtdcr(memcfga,reg);mtdcr(memcfgd,data)
+
+#define ONE_BILLION 1000000000
+
+struct sdram_conf_s {
+ unsigned long size;
+ int rows;
+ unsigned long reg;
+};
+
+typedef struct sdram_conf_s sdram_conf_t;
+
+/* Bitfields offsets */
+#define SDRAM0_TR_CASL (31 - 8)
+#define SDRAM0_TR_PTA (31 - 13)
+#define SDRAM0_TR_CTP (31 - 15)
+#define SDRAM0_TR_LDF (31 - 17)
+#define SDRAM0_TR_RFTA (31 - 29)
+#define SDRAM0_TR_RCD (31 - 31)
+
+#ifdef CFG_SDRAM_CL
+/* SDRAM timings [ns] according to AMCC/IBM names (see SDRAM_faq.doc) */
+#define CFG_SDRAM_CASL CFG_SDRAM_CL
+#define CFG_SDRAM_PTA CFG_SDRAM_tRP
+#define CFG_SDRAM_CTP (CFG_SDRAM_tRC - CFG_SDRAM_tRCD - CFG_SDRAM_tRP)
+#define CFG_SDRAM_LDF 0
+#ifdef CFG_SDRAM_tRFC
+#define CFG_SDRAM_RFTA CFG_SDRAM_tRFC
+#else
+#define CFG_SDRAM_RFTA CFG_SDRAM_tRC
+#endif
+#define CFG_SDRAM_RCD CFG_SDRAM_tRCD
+#endif /* #ifdef CFG_SDRAM_CL */
+
+/*
+ * Some defines for the 440 DDR controller
+ */
+#define SDRAM_CFG0_DC_EN 0x80000000 /* SDRAM Controller Enable */
+#define SDRAM_CFG0_MEMCHK 0x30000000 /* Memory data error checking mask*/
+#define SDRAM_CFG0_MEMCHK_NON 0x00000000 /* No ECC generation */
+#define SDRAM_CFG0_MEMCHK_GEN 0x20000000 /* ECC generation */
+#define SDRAM_CFG0_MEMCHK_CHK 0x30000000 /* ECC generation and checking */
+#define SDRAM_CFG0_DRAMWDTH 0x02000000 /* DRAM width mask */
+#define SDRAM_CFG0_DRAMWDTH_32 0x00000000 /* 32 bits */
+#define SDRAM_CFG0_DRAMWDTH_64 0x02000000 /* 64 bits */
+
+#endif
generated by cgit v1.1 at 2024-11-18 04:13:51 +0000