[U-Boot] [PATCH 1/2] PPC4xx IBM Memory Controller DDR autocalibration routines.
Adam Graham
agraham at amcc.com
Wed Sep 3 21:26:28 CEST 2008
Alternate SDRAM DDR autocalibration routine that can be generically used
for any PPC4xx chips that have the IBM SDRAM Controller core allowing for
support of more DIMM/memory chip vendors and gets the DDR autocalibration
values which give the best read latency performance (SDRAM0_RDCC.[RDSS]).
Two alternate SDRAM DDR autocalibration algoritm are provided in this patch,
"Method_A" and "Method_B". DDR autocalibration Method_A scans the full range
of possible PPC4xx SDRAM Controller DDR autocalibration values and takes a
lot longer to run than Method_B. Method_B executes in the same amount of time
as the currently existing DDR autocalibration routine, i.e. 1 second or so.
Normally Method_B is used and it is set as the default method.
The current U-Boot PPC4xx DDR autocalibration code calibrates the IBM SDRAM
Controller registers.[bit-field]:
1) SDRAM0_RQDC.[RQFD]
2) SDRAM0_RFDC.[RFFD]
This alternate PPC4xx DDR autocalibration code calibrates the following
IBM SDRAM Controller registers.[bit-field]:
1) SDRAM0_WRDTR.[WDTR]
2) SDRAM0_CLKTR.[CKTR]
3) SDRAM0_RQDC.[RQFD]
4) SDRAM0_RFDC.[RFFD]
and will also use the calibrated settings of the above four registers that
produce the best "Read Sample Cycle Select" value in the SDRAM0_RDCC.[RDSS]
register.[bit-field].
Signed-off-by: Adam Graham <agraham at amcc.com>
---
cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c | 1212 +++++++++++++++++++++++++++++++++++
1 files changed, 1212 insertions(+), 0 deletions(-)
create mode 100644 cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c
diff --git a/cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c b/cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c
new file mode 100644
index 0000000..83b9883
--- /dev/null
+++ b/cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c
@@ -0,0 +1,1212 @@
+/*
+ * cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c
+ * This SPD SDRAM detection code supports AMCC PPC44x cpu's with a
+ * DDR2 controller (non Denali Core). Those currently are:
+ *
+ * 405: 405EX
+ * 440/460: 440SP/440SPe/460EX/460GT/460SX
+ *
+ * (C) Copyright 2008 Applied Micro Circuits Corporation
+ * Adam Graham <agraham at amcc.com>
+ *
+ * (C) Copyright 2007-2008
+ * Stefan Roese, DENX Software Engineering, sr at denx.de.
+ *
+ * COPYRIGHT AMCC CORPORATION 2004
+ *
+ * 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
+ *
+ */
+
+/* define DEBUG for debugging output (obviously ;-)) */
+#undef DEBUG
+
+#include <common.h>
+#include <ppc4xx.h>
+#include <asm/io.h>
+#include <asm/processor.h>
+
+#if defined(CONFIG_PPC4xx_DDR_AUTOCALIBRATION)
+
+/*
+ * Only compile the DDR auto-calibration code for NOR boot and
+ * not for NAND boot (NAND SPL and NAND U-Boot - NUB)
+ */
+#if !defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL)
+
+#define MAXBXCF 4
+#define SDRAM_RXBAS_SHIFT_1M 20
+
+#if defined(CFG_DECREMENT_PATTERNS)
+#define NUMMEMTESTS 24
+#else
+#define NUMMEMTESTS 8
+#endif /* CFG_DECREMENT_PATTERNS */
+#define NUMLOOPS 1 /* configure as you deem approporiate */
+#define NUMMEMWORDS 16
+
+/* Private Structure Definitions */
+
+struct autocal_regs {
+ u32 rffd;
+ u32 rqfd;
+};
+
+struct ddrautocal {
+ u32 rffd;
+ u32 rffd_min;
+ u32 rffd_max;
+ u32 rffd_size;
+ u32 rqfd;
+ u32 rqfd_size;
+ u32 rdcc;
+ u32 flags;
+};
+
+struct sdram_timing {
+ u32 wrdtr;
+ u32 clktr;
+};
+
+struct sdram_timing_clks {
+ u32 wrdtr;
+ u32 clktr;
+ u32 rdcc;
+ u32 flags;
+};
+
+struct autocal_clks {
+ struct sdram_timing_clks clocks;
+ struct ddrautocal autocal;
+};
+
+/*--------------------------------------------------------------------------+
+ * Prototypes
+ *--------------------------------------------------------------------------*/
+#if defined(CONFIG_PPC4xx_DDR_METHOD_A)
+static u32 DQS_calibration_methodA(struct ddrautocal *);
+static u32 program_DQS_calibration_methodA(struct ddrautocal *);
+#else
+static u32 DQS_calibration_methodB(struct ddrautocal *);
+static u32 program_DQS_calibration_methodB(struct ddrautocal *);
+#endif
+static int short_mem_test(u32 *);
+
+/*
+ * To provide an interface for board specific config values in this common
+ * DDR setup code, we implement he "weak" default functions here. They return
+ * the default value back to the caller.
+ *
+ * Please see include/configs/yucca.h for an example fora board specific
+ * implementation.
+ */
+
+#if !defined(CONFIG_SPD_EEPROM)
+u32 __ddr_wrdtr(u32 default_val)
+{
+ return default_val;
+}
+u32 ddr_wrdtr(u32) __attribute__((weak, alias("__ddr_wrdtr")));
+
+u32 __ddr_clktr(u32 default_val)
+{
+ return default_val;
+}
+u32 ddr_clktr(u32) __attribute__((weak, alias("__ddr_clktr")));
+
+/*
+ * Board-specific Platform code can reimplement spd_ddr_init_hang () if needed
+ */
+void __spd_ddr_init_hang(void)
+{
+ hang();
+}
+void
+spd_ddr_init_hang(void) __attribute__((weak, alias("__spd_ddr_init_hang")));
+#endif /* defined(CONFIG_SPD_EEPROM) */
+
+ulong __ddr_scan_option(ulong default_val)
+{
+ return default_val;
+}
+ulong ddr_scan_option(ulong) __attribute__((weak, alias("__ddr_scan_option")));
+
+static u32 *get_membase(int bxcr_num)
+{
+ ulong bxcf;
+ u32 *membase;
+
+#if defined(SDRAM_R0BAS)
+ /* BAS from Memory Queue rank reg. */
+ membase =
+ (u32 *)(SDRAM_RXBAS_SDBA_DECODE(mfdcr_any(SDRAM_R0BAS+bxcr_num)));
+ bxcf = 0; /* just to satisfy the compiler */
+#else
+ /* BAS from SDRAM_MBxCF mem rank reg. */
+ mfsdram(SDRAM_MB0CF + (bxcr_num<<2), bxcf);
+ membase = (u32 *)((bxcf & 0xfff80000) << 3);
+#endif
+
+ return membase;
+}
+
+static inline void ecc_clear_status_reg(void)
+{
+ mtsdram(SDRAM_ECCCR, 0xffffffff);
+#if defined(SDRAM_R0BAS)
+ mtdcr(SDRAM_ERRSTATLL, 0xffffffff);
+#endif
+}
+
+static int ecc_check_status_reg(void)
+{
+ u32 ecc_status;
+
+ /*
+ * Compare suceeded, now check
+ * if got ecc error. If got an
+ * ecc error, then don't count
+ * this as a passing value
+ */
+ mfsdram(SDRAM_ECCCR, ecc_status);
+ if (ecc_status != 0x00000000) {
+ /* clear on error */
+ ecc_clear_status_reg();
+ /* ecc check failure */
+ return 0;
+ }
+ ecc_clear_status_reg();
+ sync();
+
+ return 1;
+}
+
+/* return 1 if passes, 0 if fail */
+static int short_mem_test(u32 *base_address)
+{
+ int i, j, l;
+ u32 ecc_mode = 0;
+
+ ulong test[NUMMEMTESTS][NUMMEMWORDS] = {
+ /* 0 */ {0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF,
+ 0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF,
+ 0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF,
+ 0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF},
+ /* 1 */ {0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000,
+ 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000,
+ 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000,
+ 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000},
+ /* 2 */ {0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555,
+ 0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555,
+ 0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555,
+ 0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555},
+ /* 3 */ {0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA,
+ 0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA,
+ 0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA,
+ 0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA},
+ /* 4 */ {0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A,
+ 0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A,
+ 0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A,
+ 0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A},
+ /* 5 */ {0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5,
+ 0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5,
+ 0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5,
+ 0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5},
+ /* 6 */ {0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA,
+ 0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA,
+ 0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA,
+ 0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA},
+ /* 7 */ {0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55,
+ 0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55,
+ 0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55,
+ 0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55},
+
+#if defined(CFG_DECREMENT_PATTERNS)
+ /* 8 */ {0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff,
+ 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff,
+ 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff,
+ 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff},
+ /* 9 */ {0xfffefffe, 0xfffefffe, 0xfffefffe, 0xfffefffe,
+ 0xfffefffe, 0xfffefffe, 0xfffefffe, 0xfffefffe,
+ 0xfffefffe, 0xfffefffe, 0xfffefffe, 0xfffefffe,
+ 0xfffefffe, 0xfffefffe, 0xfffefffe, 0xfffefffe},
+ /* 10 */{0xfffdfffd, 0xfffdfffd, 0xfffdffff, 0xfffdfffd,
+ 0xfffdfffd, 0xfffdfffd, 0xfffdffff, 0xfffdfffd,
+ 0xfffdfffd, 0xfffdfffd, 0xfffdffff, 0xfffdfffd,
+ 0xfffdfffd, 0xfffdfffd, 0xfffdffff, 0xfffdfffd},
+ /* 11 */{0xfffcfffc, 0xfffcfffc, 0xfffcfffc, 0xfffcfffc,
+ 0xfffcfffc, 0xfffcfffc, 0xfffcfffc, 0xfffcfffc,
+ 0xfffcfffc, 0xfffcfffc, 0xfffcfffc, 0xfffcfffc,
+ 0xfffcfffc, 0xfffcfffc, 0xfffcfffc, 0xfffcfffc},
+ /* 12 */{0xfffbfffb, 0xfffffffb, 0xfffffffb, 0xfffffffb,
+ 0xfffbfffb, 0xfffffffb, 0xfffffffb, 0xfffffffb,
+ 0xfffbfffb, 0xfffffffb, 0xfffffffb, 0xfffffffb,
+ 0xfffbfffb, 0xfffffffb, 0xfffffffb, 0xfffffffb},
+ /* 13 */{0xfffafffa, 0xfffafffa, 0xfffffffa, 0xfffafffa,
+ 0xfffafffa, 0xfffafffa, 0xfffafffa, 0xfffafffa,
+ 0xfffafffa, 0xfffafffa, 0xfffafffa, 0xfffafffa,
+ 0xfffafffa, 0xfffafffa, 0xfffafffa, 0xfffafffa},
+ /* 14 */{0xfff9fff9, 0xfff9fff9, 0xfff9fff9, 0xfff9fff9,
+ 0xfff9fff9, 0xfff9fff9, 0xfff9fff9, 0xfff9fff9,
+ 0xfff9fff9, 0xfff9fff9, 0xfff9fff9, 0xfff9fff9,
+ 0xfff9fff9, 0xfff9fff9, 0xfff9fff9, 0xfff9fff9},
+ /* 15 */{0xfff8fff8, 0xfff8fff8, 0xfff8fff8, 0xfff8fff8,
+ 0xfff8fff8, 0xfff8fff8, 0xfff8fff8, 0xfff8fff8,
+ 0xfff8fff8, 0xfff8fff8, 0xfff8fff8, 0xfff8fff8,
+ 0xfff8fff8, 0xfff8fff8, 0xfff8fff8, 0xfff8fff8},
+ /* 16 */{0xfff7fff7, 0xfff7ffff, 0xfff7fff7, 0xfff7fff7,
+ 0xfff7fff7, 0xfff7ffff, 0xfff7fff7, 0xfff7fff7,
+ 0xfff7fff7, 0xfff7ffff, 0xfff7fff7, 0xfff7fff7,
+ 0xfff7ffff, 0xfff7ffff, 0xfff7fff7, 0xfff7fff7},
+ /* 17 */{0xfff6fff5, 0xfff6ffff, 0xfff6fff6, 0xfff6fff7,
+ 0xfff6fff5, 0xfff6ffff, 0xfff6fff6, 0xfff6fff7,
+ 0xfff6fff5, 0xfff6ffff, 0xfff6fff6, 0xfff6fff7,
+ 0xfff6fff5, 0xfff6ffff, 0xfff6fff6, 0xfff6fff7},
+ /* 18 */{0xfff5fff4, 0xfff5ffff, 0xfff5fff5, 0xfff5fff5,
+ 0xfff5fff4, 0xfff5ffff, 0xfff5fff5, 0xfff5fff5,
+ 0xfff5fff4, 0xfff5ffff, 0xfff5fff5, 0xfff5fff5,
+ 0xfff5fff4, 0xfff5ffff, 0xfff5fff5, 0xfff5fff5},
+ /* 19 */{0xfff4fff3, 0xfff4ffff, 0xfff4fff4, 0xfff4fff4,
+ 0xfff4fff3, 0xfff4ffff, 0xfff4fff4, 0xfff4fff4,
+ 0xfff4fff3, 0xfff4ffff, 0xfff4fff4, 0xfff4fff4,
+ 0xfff4fff3, 0xfff4ffff, 0xfff4fff4, 0xfff4fff4},
+ /* 20 */{0xfff3fff2, 0xfff3ffff, 0xfff3fff3, 0xfff3fff3,
+ 0xfff3fff2, 0xfff3ffff, 0xfff3fff3, 0xfff3fff3,
+ 0xfff3fff2, 0xfff3ffff, 0xfff3fff3, 0xfff3fff3,
+ 0xfff3fff2, 0xfff3ffff, 0xfff3fff3, 0xfff3fff3},
+ /* 21 */{0xfff2ffff, 0xfff2ffff, 0xfff2fff2, 0xfff2fff2,
+ 0xfff2ffff, 0xfff2ffff, 0xfff2fff2, 0xfff2fff2,
+ 0xfff2ffff, 0xfff2ffff, 0xfff2fff2, 0xfff2fff2,
+ 0xfff2ffff, 0xfff2ffff, 0xfff2fff2, 0xfff2fff2},
+ /* 22 */{0xfff1ffff, 0xfff1ffff, 0xfff1fff1, 0xfff1fff1,
+ 0xfff1ffff, 0xfff1ffff, 0xfff1fff1, 0xfff1fff1,
+ 0xfff1ffff, 0xfff1ffff, 0xfff1fff1, 0xfff1fff1,
+ 0xfff1ffff, 0xfff1ffff, 0xfff1fff1, 0xfff1fff1},
+ /* 23 */{0xfff0fff0, 0xfff0fff0, 0xfff0fff0, 0xfff0fff0,
+ 0xfff0fff0, 0xfff0fff0, 0xfff0fff0, 0xfff0fff0,
+ 0xfff0fff0, 0xfff0fff0, 0xfff0fff0, 0xfff0fff0,
+ 0xfff0fff0, 0xfff0fffe, 0xfff0fff0, 0xfff0fff0},
+#endif /* CFG_DECREMENT_PATTERNS */
+ };
+
+ mfsdram(SDRAM_MCOPT1, ecc_mode);
+ if ((ecc_mode & SDRAM_MCOPT1_MCHK_CHK_REP) ==
+ SDRAM_MCOPT1_MCHK_CHK_REP) {
+ ecc_clear_status_reg();
+ sync();
+ ecc_mode = 1;
+ } else {
+ ecc_mode = 0;
+ }
+
+ /*
+ * Run the short memory test.
+ */
+ for (i = 0; i < NUMMEMTESTS; i++) {
+ for (j = 0; j < NUMMEMWORDS; j++) {
+ base_address[j] = test[i][j];
+ ppcDcbf((ulong)&(base_address[j]));
+ }
+ sync();
+ for (l = 0; l < NUMLOOPS; l++) {
+ for (j = 0; j < NUMMEMWORDS; j++) {
+ if (base_address[j] != test[i][j]) {
+ ppcDcbf((u32)&(base_address[j]));
+ return 0;
+ } else {
+ if (ecc_mode) {
+ if (!ecc_check_status_reg())
+ return 0;
+ }
+ }
+ ppcDcbf((u32)&(base_address[j]));
+ } /* for (j = 0; j < NUMMEMWORDS; j++) */
+ sync();
+ } /* for (l=0; l<NUMLOOPS; l++) */
+ }
+
+ return 1;
+}
+
+#if defined(CONFIG_PPC4xx_DDR_METHOD_A)
+/*-----------------------------------------------------------------------------+
+| program_DQS_calibration_methodA.
++-----------------------------------------------------------------------------*/
+static u32 program_DQS_calibration_methodA(struct ddrautocal *ddrcal)
+{
+ u32 pass_result = 0;
+
+#ifdef DEBUG
+ ulong temp;
+
+ mfsdram(SDRAM_RDCC, temp);
+ debug("<%s>SDRAM_RDCC=0x%08x\n", __func__, temp);
+#endif
+
+ pass_result = DQS_calibration_methodA(ddrcal);
+
+ return pass_result;
+}
+
+/*
+ * DQS_calibration_methodA()
+ *
+ * Autocalibration Method A
+ *
+ * ARRAY [Entire DQS Range] DQS_Valid_Window ; initialized to all zeros
+ * ARRAY [Entire FDBK Range] FDBK_Valid_Window; initialized to all zeros
+ * MEMWRITE(addr, expected_data);
+ * for (i = 0; i < Entire DQS Range; i++) { RQDC.RQFD
+ * for (j = 0; j < Entire FDBK Range; j++) { RFDC.RFFD
+ * MEMREAD(addr, actual_data);
+ * if (actual_data == expected_data) {
+ * DQS_Valid_Window[i] = 1; RQDC.RQFD
+ * FDBK_Valid_Window[i][j] = 1; RFDC.RFFD
+ * }
+ * }
+ * }
+ */
+static u32 DQS_calibration_methodA(struct ddrautocal *cal)
+{
+ ulong rfdc_reg;
+ ulong rffd;
+
+ ulong rqdc_reg;
+ ulong rqfd;
+
+ u32 *membase;
+ ulong bxcf;
+ int rqfd_average;
+ int bxcr_num;
+ int rffd_average;
+ int pass;
+ u32 passed = 0;
+
+ int in_window;
+ struct autocal_regs curr_win_min;
+ struct autocal_regs curr_win_max;
+ struct autocal_regs best_win_min;
+ struct autocal_regs best_win_max;
+ struct autocal_regs loop_win_min;
+ struct autocal_regs loop_win_max;
+
+#ifdef DEBUG
+ ulong temp;
+#endif
+ ulong rdcc;
+
+ char slash[] = "\\|/-\\|/-";
+ int loopi = 0;
+
+ /* start */
+ in_window = 0;
+
+ memset(&curr_win_min, 0, sizeof(curr_win_min));
+ memset(&curr_win_max, 0, sizeof(curr_win_max));
+ memset(&best_win_min, 0, sizeof(best_win_min));
+ memset(&best_win_max, 0, sizeof(best_win_max));
+ memset(&loop_win_min, 0, sizeof(loop_win_min));
+ memset(&loop_win_max, 0, sizeof(loop_win_max));
+
+ rdcc = 0;
+
+ /*
+ * Program RDCC register
+ * Read sample cycle auto-update enable
+ */
+ mtsdram(SDRAM_RDCC, SDRAM_RDCC_RDSS_T1 | SDRAM_RDCC_RSAE_ENABLE);
+
+#ifdef DEBUG
+ mfsdram(SDRAM_RDCC, temp);
+ debug("<%s>SDRAM_RDCC=0x%x\n", __func__, temp);
+ mfsdram(SDRAM_RTSR, temp);
+ debug("<%s>SDRAM_RTSR=0x%x\n", __func__, temp);
+ mfsdram(SDRAM_FCSR, temp);
+ debug("<%s>SDRAM_FCSR=0x%x\n", __func__, temp);
+#endif
+
+ /*
+ * Program RQDC register
+ * Internal DQS delay mechanism enable
+ */
+ mtsdram(SDRAM_RQDC,
+ SDRAM_RQDC_RQDE_ENABLE | SDRAM_RQDC_RQFD_ENCODE(0x00));
+
+#ifdef DEBUG
+ mfsdram(SDRAM_RQDC, temp);
+ debug("<%s>SDRAM_RQDC=0x%x\n", __func__, temp);
+#endif
+
+ /*
+ * Program RFDC register
+ * Set Feedback Fractional Oversample
+ * Auto-detect read sample cycle enable
+ */
+ mtsdram(SDRAM_RFDC, SDRAM_RFDC_ARSE_ENABLE |
+ SDRAM_RFDC_RFOS_ENCODE(0) | SDRAM_RFDC_RFFD_ENCODE(0));
+
+#ifdef DEBUG
+ mfsdram(SDRAM_RFDC, temp);
+ debug("<%s>SDRAM_RFDC=0x%x\n", __func__, temp);
+#endif
+
+ putc(' ');
+ for (rqfd = 0; rqfd <= SDRAM_RQDC_RQFD_MAX; rqfd++) {
+
+ mfsdram(SDRAM_RQDC, rqdc_reg);
+ rqdc_reg &= ~(SDRAM_RQDC_RQFD_MASK);
+ mtsdram(SDRAM_RQDC, rqdc_reg | SDRAM_RQDC_RQFD_ENCODE(rqfd));
+
+ putc('\b');
+ putc(slash[loopi++ % 8]);
+
+ curr_win_min.rffd = 0;
+ curr_win_max.rffd = 0;
+ in_window = 0;
+
+ for (rffd = 0, pass = 0; rffd <= SDRAM_RFDC_RFFD_MAX; rffd++) {
+ mfsdram(SDRAM_RFDC, rfdc_reg);
+ rfdc_reg &= ~(SDRAM_RFDC_RFFD_MASK);
+ mtsdram(SDRAM_RFDC,
+ rfdc_reg | SDRAM_RFDC_RFFD_ENCODE(rffd));
+
+ for (bxcr_num = 0; bxcr_num < MAXBXCF; bxcr_num++) {
+ mfsdram(SDRAM_MB0CF + (bxcr_num<<2), bxcf);
+
+ /* Banks enabled */
+ if (bxcf & SDRAM_BXCF_M_BE_MASK) {
+ /* Bank is enabled */
+ membase = get_membase(bxcr_num);
+ pass = short_mem_test(membase);
+ } /* if bank enabled */
+ } /* for bxcr_num */
+
+ /* If this value passed update RFFD windows */
+ if (pass && !in_window) { /* at the start of window */
+ in_window = 1;
+ curr_win_min.rffd = curr_win_max.rffd = rffd;
+ curr_win_min.rqfd = curr_win_max.rqfd = rqfd;
+ mfsdram(SDRAM_RDCC, rdcc); /*record this value*/
+ } else if (!pass && in_window) { /* at end of window */
+ in_window = 0;
+ } else if (pass && in_window) { /* within the window */
+ curr_win_max.rffd = rffd;
+ curr_win_max.rqfd = rqfd;
+ }
+ /* else if (!pass && !in_window)
+ skip - no pass, not currently in a window */
+
+ if (in_window) {
+ if ((curr_win_max.rffd - curr_win_min.rffd) >
+ (best_win_max.rffd - best_win_min.rffd)) {
+ best_win_min.rffd = curr_win_min.rffd;
+ best_win_max.rffd = curr_win_max.rffd;
+
+ best_win_min.rqfd = curr_win_min.rqfd;
+ best_win_max.rqfd = curr_win_max.rqfd;
+ cal->rdcc = rdcc;
+ }
+ passed = 1;
+ }
+ } /* RFDC.RFFD */
+
+ /*
+ * save-off the best window results of the RFDC.RFFD
+ * for this RQDC.RQFD setting
+ */
+ /*
+ * if (just ended RFDC.RFDC loop pass window) >
+ * (prior RFDC.RFFD loop pass window)
+ */
+ if ((best_win_max.rffd - best_win_min.rffd) >
+ (loop_win_max.rffd - loop_win_min.rffd)) {
+ loop_win_min.rffd = best_win_min.rffd;
+ loop_win_max.rffd = best_win_max.rffd;
+ loop_win_min.rqfd = rqfd;
+ loop_win_max.rqfd = rqfd;
+ debug("RQFD.min 0x%08x, RQFD.max 0x%08x, "
+ "RFFD.min 0x%08x, RFFD.max 0x%08x\n",
+ loop_win_min.rqfd, loop_win_max.rqfd,
+ loop_win_min.rffd, loop_win_max.rffd);
+ }
+ } /* RQDC.RQFD */
+
+ putc('\b');
+
+ debug("\n");
+
+ if ((loop_win_min.rffd == 0) && (loop_win_max.rffd == 0) &&
+ (best_win_min.rffd == 0) && (best_win_max.rffd == 0) &&
+ (best_win_min.rqfd == 0) && (best_win_max.rqfd == 0)) {
+ passed = 0;
+ }
+
+ /*
+ * Need to program RQDC before RFDC.
+ */
+ debug("<%s> RQFD Min: 0x%x\n", __func__, loop_win_min.rqfd);
+ debug("<%s> RQFD Max: 0x%x\n", __func__, loop_win_max.rqfd);
+ rqfd_average = loop_win_max.rqfd;
+
+ if (rqfd_average < 0)
+ rqfd_average = 0;
+
+ if (rqfd_average > SDRAM_RQDC_RQFD_MAX)
+ rqfd_average = SDRAM_RQDC_RQFD_MAX;
+
+ debug("<%s> RFFD average: 0x%08x\n", __func__, rqfd_average);
+ mtsdram(SDRAM_RQDC, (rqdc_reg & ~SDRAM_RQDC_RQFD_MASK) |
+ SDRAM_RQDC_RQFD_ENCODE(rqfd_average));
+
+ debug("<%s> RFFD Min: 0x%08x\n", __func__, loop_win_min.rffd);
+ debug("<%s> RFFD Max: 0x%08x\n", __func__, loop_win_max.rffd);
+ rffd_average = ((loop_win_min.rffd + loop_win_max.rffd) / 2);
+
+ if (rffd_average < 0)
+ rffd_average = 0;
+
+ if (rffd_average > SDRAM_RFDC_RFFD_MAX)
+ rffd_average = SDRAM_RFDC_RFFD_MAX;
+
+ debug("<%s> RFFD average: 0x%08x\n", __func__, rffd_average);
+ mtsdram(SDRAM_RFDC, rfdc_reg | SDRAM_RFDC_RFFD_ENCODE(rffd_average));
+
+ /* if something passed, then return the size of the largest window */
+ if (passed != 0) {
+ passed = loop_win_max.rffd - loop_win_min.rffd;
+ cal->rqfd = rqfd_average;
+ cal->rffd = rffd_average;
+ cal->rffd_min = loop_win_min.rffd;
+ cal->rffd_max = loop_win_max.rffd;
+ }
+
+ return (u32)passed;
+}
+
+#else /* !defined(CONFIG_PPC4xx_DDR_METHOD_A) */
+
+/*-----------------------------------------------------------------------------+
+| program_DQS_calibration_methodB.
++-----------------------------------------------------------------------------*/
+static u32 program_DQS_calibration_methodB(struct ddrautocal *ddrcal)
+{
+ u32 pass_result = 0;
+
+#ifdef DEBUG
+ ulong temp;
+#endif
+
+ /*
+ * Program RDCC register
+ * Read sample cycle auto-update enable
+ */
+ mtsdram(SDRAM_RDCC, SDRAM_RDCC_RDSS_T2 | SDRAM_RDCC_RSAE_ENABLE);
+
+#ifdef DEBUG
+ mfsdram(SDRAM_RDCC, temp);
+ debug("<%s>SDRAM_RDCC=0x%08x\n", __func__, temp);
+#endif
+
+ /*
+ * Program RQDC register
+ * Internal DQS delay mechanism enable
+ */
+ mtsdram(SDRAM_RQDC,
+#if defined(CONFIG_DDR_RQDC_START_VAL)
+ SDRAM_RQDC_RQDE_ENABLE |
+ SDRAM_RQDC_RQFD_ENCODE(CONFIG_DDR_RQDC_START_VAL));
+#else
+ SDRAM_RQDC_RQDE_ENABLE | SDRAM_RQDC_RQFD_ENCODE(0x38));
+#endif
+
+#ifdef DEBUG
+ mfsdram(SDRAM_RQDC, temp);
+ debug("<%s>SDRAM_RQDC=0x%08x\n", __func__, temp);
+#endif
+
+ /*
+ * Program RFDC register
+ * Set Feedback Fractional Oversample
+ * Auto-detect read sample cycle enable
+ */
+ mtsdram(SDRAM_RFDC, SDRAM_RFDC_ARSE_ENABLE |
+ SDRAM_RFDC_RFOS_ENCODE(0) |
+ SDRAM_RFDC_RFFD_ENCODE(0));
+
+#ifdef DEBUG
+ mfsdram(SDRAM_RFDC, temp);
+ debug("<%s>SDRAM_RFDC=0x%08x\n", __func__, temp);
+#endif
+
+ pass_result = DQS_calibration_methodB(ddrcal);
+
+ return pass_result;
+}
+
+/*
+ * DQS_calibration_methodB()
+ *
+ * Autocalibration Method B
+ *
+ * ARRAY [Entire DQS Range] DQS_Valid_Window ; initialized to all zeros
+ * ARRAY [Entire Feedback Range] FDBK_Valid_Window; initialized to all zeros
+ * MEMWRITE(addr, expected_data);
+ * Initialialize the DQS delay to 80 degrees (MCIF0_RRQDC[RQFD]=0x38).
+ *
+ * for (j = 0; j < Entire Feedback Range; j++) {
+ * MEMREAD(addr, actual_data);
+ * if (actual_data == expected_data) {
+ * FDBK_Valid_Window[j] = 1;
+ * }
+ * }
+ *
+ * Set MCIF0_RFDC[RFFD] to the middle of the FDBK_Valid_Window.
+ *
+ * for (i = 0; i < Entire DQS Range; i++) {
+ * MEMREAD(addr, actual_data);
+ * if (actual_data == expected_data) {
+ * DQS_Valid_Window[i] = 1;
+ * }
+ * }
+ *
+ * Set MCIF0_RRQDC[RQFD] to the middle of the DQS_Valid_Window.
+ */
+/*-----------------------------------------------------------------------------+
+| DQS_calibration_methodB.
++-----------------------------------------------------------------------------*/
+static u32 DQS_calibration_methodB(struct ddrautocal *cal)
+{
+ ulong rfdc_reg;
+ ulong rffd;
+
+ ulong rqdc_reg;
+ ulong rqfd;
+
+ ulong rdcc;
+
+ u32 *membase;
+ ulong bxcf;
+ int rqfd_average;
+ int bxcr_num;
+ int rffd_average;
+ int pass;
+ uint passed = 0;
+
+ int in_window;
+ u32 curr_win_min, curr_win_max;
+ u32 best_win_min, best_win_max;
+ u32 size = 0;
+
+ /*------------------------------------------------------------------
+ | Test to determine the best read clock delay tuning bits.
+ |
+ | Before the DDR controller can be used, the read clock delay needs to
+ | be set. This is SDRAM_RQDC[RQFD] and SDRAM_RFDC[RFFD].
+ | This value cannot be hardcoded into the program because it changes
+ | depending on the board's setup and environment.
+ | To do this, all delay values are tested to see if they
+ | work or not. By doing this, you get groups of fails with groups of
+ | passing values. The idea is to find the start and end of a passing
+ | window and take the center of it to use as the read clock delay.
+ |
+ | A failure has to be seen first so that when we hit a pass, we know
+ | that it is truely the start of the window. If we get passing values
+ | to start off with, we don't know if we are at the start of the window
+ |
+ | The code assumes that a failure will always be found.
+ | If a failure is not found, there is no easy way to get the middle
+ | of the passing window. I guess we can pretty much pick any value
+ | but some values will be better than others. Since the lowest speed
+ | we can clock the DDR interface at is 200 MHz (2x 100 MHz PLB speed),
+ | from experimentation it is safe to say you will always have a failure
+ +-----------------------------------------------------------------*/
+
+ debug("\n\n");
+
+ in_window = 0;
+ rdcc = 0;
+
+ curr_win_min = curr_win_max = 0;
+ best_win_min = best_win_max = 0;
+ for (rffd = 0; rffd <= SDRAM_RFDC_RFFD_MAX; rffd++) {
+ mfsdram(SDRAM_RFDC, rfdc_reg);
+ rfdc_reg &= ~(SDRAM_RFDC_RFFD_MASK);
+ mtsdram(SDRAM_RFDC, rfdc_reg | SDRAM_RFDC_RFFD_ENCODE(rffd));
+
+ pass = 1;
+ for (bxcr_num = 0; bxcr_num < MAXBXCF; bxcr_num++) {
+ mfsdram(SDRAM_MB0CF + (bxcr_num<<2), bxcf);
+
+ /* Banks enabled */
+ if (bxcf & SDRAM_BXCF_M_BE_MASK) {
+ /* Bank is enabled */
+ membase = get_membase(bxcr_num);
+ pass &= short_mem_test(membase);
+ } /* if bank enabled */
+ } /* for bxcf_num */
+
+ /* If this value passed */
+ if (pass && !in_window) { /* start of passing window */
+ in_window = 1;
+ curr_win_min = curr_win_max = rffd;
+ mfsdram(SDRAM_RDCC, rdcc); /* record this value */
+ } else if (!pass && in_window) { /* end passing window */
+ in_window = 0;
+ } else if (pass && in_window) { /* within the passing window */
+ curr_win_max = rffd;
+ }
+
+ if (in_window) {
+ if ((curr_win_max - curr_win_min) >
+ (best_win_max - best_win_min)) {
+ best_win_min = curr_win_min;
+ best_win_max = curr_win_max;
+ cal->rdcc = rdcc;
+ }
+ passed = 1;
+ }
+ } /* for rffd */
+
+ if ((best_win_min == 0) && (best_win_max == 0))
+ passed = 0;
+ else
+ size = best_win_max - best_win_min;
+
+ debug("RFFD Min: 0x%x\n", best_win_min);
+ debug("RFFD Max: 0x%x\n", best_win_max);
+ rffd_average = ((best_win_min + best_win_max) / 2);
+
+ cal->rffd_min = best_win_min;
+ cal->rffd_max = best_win_max;
+
+ if (rffd_average < 0)
+ rffd_average = 0;
+
+ if (rffd_average > SDRAM_RFDC_RFFD_MAX)
+ rffd_average = SDRAM_RFDC_RFFD_MAX;
+
+ mtsdram(SDRAM_RFDC, rfdc_reg | SDRAM_RFDC_RFFD_ENCODE(rffd_average));
+
+ rffd = rffd_average;
+ in_window = 0;
+
+ curr_win_min = curr_win_max = 0;
+ best_win_min = best_win_max = 0;
+ for (rqfd = 0; rqfd <= SDRAM_RQDC_RQFD_MAX; rqfd++) {
+ mfsdram(SDRAM_RQDC, rqdc_reg);
+ rqdc_reg &= ~(SDRAM_RQDC_RQFD_MASK);
+ mtsdram(SDRAM_RQDC, rqdc_reg | SDRAM_RQDC_RQFD_ENCODE(rqfd));
+
+ pass = 1;
+ for (bxcr_num = 0; bxcr_num < MAXBXCF; bxcr_num++) {
+
+ mfsdram(SDRAM_MB0CF + (bxcr_num<<2), bxcf);
+
+ /* Banks enabled */
+ if (bxcf & SDRAM_BXCF_M_BE_MASK) {
+ /* Bank is enabled */
+ membase = get_membase(bxcr_num);
+ pass &= short_mem_test(membase);
+ } /* if bank enabled */
+ } /* for bxcf_num */
+
+ /* If this value passed */
+ if (pass && !in_window) {
+ in_window = 1;
+ curr_win_min = curr_win_max = rqfd;
+ } else if (!pass && in_window) {
+ in_window = 0;
+ } else if (pass && in_window) {
+ curr_win_max = rqfd;
+ }
+
+ if (in_window) {
+ if ((curr_win_max - curr_win_min) >
+ (best_win_max - best_win_min)) {
+ best_win_min = curr_win_min;
+ best_win_max = curr_win_max;
+ }
+ passed = 1;
+ }
+ } /* for rqfd */
+
+ if ((best_win_min == 0) && (best_win_max == 0))
+ passed = 0;
+
+ debug("RQFD Min: 0x%x\n", best_win_min);
+ debug("RQFD Max: 0x%x\n", best_win_max);
+ rqfd_average = ((best_win_min + best_win_max) / 2);
+
+ if (rqfd_average < 0)
+ rqfd_average = 0;
+
+ if (rqfd_average > SDRAM_RQDC_RQFD_MAX)
+ rqfd_average = SDRAM_RQDC_RQFD_MAX;
+
+ mtsdram(SDRAM_RQDC, (rqdc_reg & ~SDRAM_RQDC_RQFD_MASK) |
+ SDRAM_RQDC_RQFD_ENCODE(rqfd_average));
+
+ mfsdram(SDRAM_RQDC, rqdc_reg);
+ mfsdram(SDRAM_RFDC, rfdc_reg);
+
+ /*
+ * Need to program RQDC before RFDC. The value is read above.
+ * That is the reason why auto cal not work.
+ * See, comments below.
+ */
+ mtsdram(SDRAM_RQDC, rqdc_reg);
+ mtsdram(SDRAM_RFDC, rfdc_reg);
+
+ debug("RQDC: 0x%08X\n", rqdc_reg);
+ debug("RFDC: 0x%08X\n", rfdc_reg);
+
+ /* if something passed, then return the size of the largest window */
+ if (passed != 0) {
+ passed = size;
+ cal->rqfd = rqfd_average;
+ cal->rffd = rffd_average;
+ }
+
+ return (uint)passed;
+}
+#endif /* defined(CONFIG_PPC4xx_DDR_METHOD_A) */
+
+/*
+ * Default table for DDR auto-calibration of all
+ * possible WRDTR and CLKTR values.
+ * Table format is:
+ * {SDRAM_WRDTR.[WDTR], SDRAM_CLKTR.[CKTR]}
+ *
+ * Table is terminated with {-1, -1} value pair.
+ *
+ * Board vendors can specify their own board specific subset of
+ * known working {SDRAM_WRDTR.[WDTR], SDRAM_CLKTR.[CKTR]} value
+ * pairs via a board defined ddr_scan_option() function.
+ */
+struct sdram_timing full_scan_options[] = {
+ {0, 0}, {0, 1}, {0, 2}, {0, 3},
+ {1, 0}, {1, 1}, {1, 2}, {1, 3},
+ {2, 0}, {2, 1}, {2, 2}, {2, 3},
+ {3, 0}, {3, 1}, {3, 2}, {3, 3},
+ {4, 0}, {4, 1}, {4, 2}, {4, 3},
+ {5, 0}, {5, 1}, {5, 2}, {5, 3},
+ {6, 0}, {6, 1}, {6, 2}, {6, 3},
+ {-1, -1}
+};
+
+/*---------------------------------------------------------------------------+
+| DQS_calibration.
++----------------------------------------------------------------------------*/
+u32 DQS_autocalibration(void)
+{
+ u32 wdtr;
+ u32 clkp;
+ u32 result = 0;
+ u32 best_result = 0;
+ u32 best_rdcc;
+ struct ddrautocal ddrcal;
+ struct autocal_clks tcal;
+ ulong rfdc_reg;
+ ulong rqdc_reg;
+ u32 val;
+ int verbose_lvl = 0;
+ char *str;
+ char slash[] = "\\|/-\\|/-";
+ int loopi = 0;
+ struct sdram_timing *scan_list;
+
+#if defined(DEBUG_PPC4xx_DDR_AUTOCALIBRATION)
+ int i;
+ char tmp[64]; /* long enough for environment variables */
+#endif
+
+ memset(&tcal, 0, sizeof(tcal));
+
+ ddr_scan_option((ulong)full_scan_options);
+
+ scan_list =
+ (struct sdram_timing *)ddr_scan_option((ulong)full_scan_options);
+
+ mfsdram(SDRAM_MCOPT1, val);
+ if ((val & SDRAM_MCOPT1_MCHK_CHK_REP) == SDRAM_MCOPT1_MCHK_CHK_REP)
+ str = "ECC Auto calibration -";
+ else
+ str = "Auto calibration -";
+
+ puts(str);
+
+#if defined(DEBUG_PPC4xx_DDR_AUTOCALIBRATION)
+ i = getenv_r("autocalib", tmp, sizeof(tmp));
+ if (i < 0)
+ strcpy(tmp, CONFIG_AUTOCALIB);
+
+ if (strcmp(tmp, "final") == 0) {
+ /* display the final autocalibration results only */
+ verbose_lvl = 1;
+ } else if (strcmp(tmp, "loop") == 0) {
+ /* display summary autocalibration info per iteration */
+ verbose_lvl = 2;
+ } else if (strcmp(tmp, "display") == 0) {
+ /* display full debug autocalibration window info. */
+ verbose_lvl = 3;
+ }
+#endif /* (DEBUG_PPC4xx_DDR_AUTOCALIBRATION) */
+
+ best_rdcc = (SDRAM_RDCC_RDSS_T4 >> 30);
+
+ while ((scan_list->wrdtr != -1) && (scan_list->clktr != -1)) {
+ wdtr = scan_list->wrdtr;
+ clkp = scan_list->clktr;
+
+ mfsdram(SDRAM_WRDTR, val);
+ val &= ~(SDRAM_WRDTR_LLWP_MASK | SDRAM_WRDTR_WTR_MASK);
+ mtsdram(SDRAM_WRDTR, (val |
+ ddr_wrdtr(SDRAM_WRDTR_LLWP_1_CYC | (wdtr << 25))));
+
+ mtsdram(SDRAM_CLKTR, clkp << 30);
+
+ putc('\b');
+ putc(slash[loopi++ % 8]);
+
+#ifdef DEBUG
+ debug("\n");
+ debug("*** --------------\n");
+ mfsdram(SDRAM_WRDTR, val);
+ debug("*** SDRAM_WRDTR set to 0x%08x\n", val);
+ mfsdram(SDRAM_CLKTR, val);
+ debug("*** SDRAM_CLKTR set to 0x%08x\n", val);
+#endif
+
+ debug("\n");
+ if (verbose_lvl > 2) {
+ printf("*** SDRAM_WRDTR (wdtr) set to %d\n", wdtr);
+ printf("*** SDRAM_CLKTR (clkp) set to %d\n", clkp);
+ }
+
+ memset(&ddrcal, 0, sizeof(ddrcal));
+
+ /*
+ * DQS calibration.
+ */
+ /*
+ * program_DQS_calibration_method[A|B]() returns 0 if no
+ * passing RFDC.[RFFD] window is found or returns the size
+ * of the best passing window; in the case of a found passing
+ * window, the ddrcal will contain the values of the best
+ * window RQDC.[RQFD] and RFDC.[RFFD].
+ */
+
+ /*
+ * Call PPC4xx SDRAM DDR autocalibration methodA or methodB.
+ * Default is methodB.
+ * Defined the autocalibration method in the board specific
+ * header file.
+ * Please see include/configs/kilauea.h for an example for
+ * a board specific implementation.
+ */
+#if defined(CONFIG_PPC4xx_DDR_METHOD_A)
+ result = program_DQS_calibration_methodA(&ddrcal);
+#else
+ result = program_DQS_calibration_methodB(&ddrcal);
+#endif
+
+ sync();
+
+ /*
+ * Clear potential errors resulting from auto-calibration.
+ * If not done, then we could get an interrupt later on when
+ * exceptions are enabled.
+ */
+ set_mcsr(get_mcsr());
+
+ val = ddrcal.rdcc; /* RDCC from the best passing window */
+
+ udelay(100);
+
+ if (verbose_lvl > 1) {
+ char *tstr;
+ switch ((val >> 30)) {
+ case 0:
+ if (result != 0)
+ tstr = "T1";
+ else
+ tstr = "N/A";
+ break;
+ case 1:
+ tstr = "T2";
+ break;
+ case 2:
+ tstr = "T3";
+ break;
+ case 3:
+ tstr = "T4";
+ break;
+ default:
+ tstr = "unknown";
+ break;
+ }
+ printf("** WRDTR(%d) CLKTR(%d), Wind (%d), best (%d), "
+ "max-min(0x%04x)(0x%04x), RDCC: %s\n",
+ wdtr, clkp, result, best_result,
+ ddrcal.rffd_min, ddrcal.rffd_max, tstr);
+ }
+
+ /*
+ * The DQS calibration "result" is either "0"
+ * if no passing window was found, or is the
+ * size of the RFFD passing window.
+ */
+ if (result != 0) {
+ tcal.autocal.flags = 1;
+ debug("*** (%d)(%d) result passed window size: 0x%08x, "
+ "rqfd = 0x%08x, rffd = 0x%08x, rdcc = 0x%08x\n",
+ wdtr, clkp, result, ddrcal.rqfd,
+ ddrcal.rffd, ddrcal.rdcc);
+ /*
+ * Save the SDRAM_WRDTR and SDRAM_CLKTR
+ * settings for the largest returned
+ * RFFD passing window size.
+ */
+ if (result > best_result) {
+ /*
+ * want the lowest Read Sample Cycle Select
+ */
+ val = (val & SDRAM_RDCC_RDSS_MASK) >> 30;
+ debug("*** (%d) (%d) current_rdcc, best_rdcc\n",
+ val, best_rdcc);
+ if (val <= best_rdcc) {
+ best_rdcc = val;
+ tcal.clocks.wrdtr = wdtr;
+ tcal.clocks.clktr = clkp;
+ tcal.clocks.rdcc = (val << 30);
+ tcal.autocal.rqfd = ddrcal.rqfd;
+ tcal.autocal.rffd = ddrcal.rffd;
+ best_result = result;
+
+ if (verbose_lvl > 2) {
+ printf("** (%d)(%d) "
+ "best result: 0x%04x\n",
+ wdtr, clkp,
+ best_result);
+ printf("** (%d)(%d) "
+ "best WRDTR: 0x%04x\n",
+ wdtr, clkp,
+ tcal.clocks.wrdtr);
+ printf("** (%d)(%d) "
+ "best CLKTR: 0x%04x\n",
+ wdtr, clkp,
+ tcal.clocks.clktr);
+ printf("** (%d)(%d) "
+ "best RQDC: 0x%04x\n",
+ wdtr, clkp,
+ tcal.autocal.rqfd);
+ printf("** (%d)(%d) "
+ "best RFDC: 0x%04x\n",
+ wdtr, clkp,
+ tcal.autocal.rffd);
+ printf("** (%d)(%d) "
+ "best RDCC: 0x%08x\n",
+ wdtr, clkp,
+ (u32)tcal.clocks.rdcc);
+ mfsdram(SDRAM_RTSR, val);
+ printf("** (%d)(%d) best "
+ "loop RTSR: 0x%08x\n",
+ wdtr, clkp, val);
+ mfsdram(SDRAM_FCSR, val);
+ printf("** (%d)(%d) best "
+ "loop FCSR: 0x%08x\n",
+ wdtr, clkp, val);
+ }
+ } /* if (val <= best_rdcc) */
+ } /* if (result >= best_result) */
+ } /* if (result != 0) */
+ scan_list++;
+ } /* while ((scan_list->wrdtr != -1) && (scan_list->clktr != -1)) */
+
+ if (tcal.autocal.flags == 1) {
+ if (verbose_lvl > 0) {
+ printf("*** --------------\n");
+ printf("*** best_result window size: %d\n",
+ best_result);
+ printf("*** best_result WRDTR: 0x%04x\n",
+ tcal.clocks.wrdtr);
+ printf("*** best_result CLKTR: 0x%04x\n",
+ tcal.clocks.clktr);
+ printf("*** best_result RQFD: 0x%04x\n",
+ tcal.autocal.rqfd);
+ printf("*** best_result RFFD: 0x%04x\n",
+ tcal.autocal.rffd);
+ printf("*** best_result RDCC: 0x%04x\n",
+ tcal.clocks.rdcc);
+ printf("*** --------------\n");
+ printf("\n");
+ }
+
+ /*
+ * if got best passing result window, then lock in the
+ * best CLKTR, WRDTR, RQFD, and RFFD values
+ */
+ mfsdram(SDRAM_WRDTR, val);
+ mtsdram(SDRAM_WRDTR, (val &
+ ~(SDRAM_WRDTR_LLWP_MASK | SDRAM_WRDTR_WTR_MASK)) |
+ ddr_wrdtr(SDRAM_WRDTR_LLWP_1_CYC |
+ (tcal.clocks.wrdtr << 25)));
+
+ mtsdram(SDRAM_CLKTR, tcal.clocks.clktr << 30);
+
+ mfsdram(SDRAM_RQDC, rqdc_reg);
+ rqdc_reg &= ~(SDRAM_RQDC_RQFD_MASK);
+ mtsdram(SDRAM_RQDC, rqdc_reg |
+ SDRAM_RQDC_RQFD_ENCODE(tcal.autocal.rqfd));
+
+ mfsdram(SDRAM_RQDC, rqdc_reg);
+ debug("*** best_result: read value SDRAM_RQDC 0x%08x\n",
+ rqdc_reg);
+
+ mfsdram(SDRAM_RFDC, rfdc_reg);
+ rfdc_reg &= ~(SDRAM_RFDC_RFFD_MASK);
+ mtsdram(SDRAM_RFDC, rfdc_reg |
+ SDRAM_RFDC_RFFD_ENCODE(tcal.autocal.rffd));
+
+ mfsdram(SDRAM_RFDC, rfdc_reg);
+ debug("*** best_result: read value SDRAM_RFDC 0x%08x\n",
+ rfdc_reg);
+ mfsdram(SDRAM_RDCC, val);
+ debug("*** SDRAM_RDCC 0x%08x\n", val);
+ } else {
+ /*
+ * no valid windows were found
+ */
+ printf("DQS memory calibration window can not be determined, "
+ "terminating u-boot.\n");
+ ppc4xx_ibm_ddr2_register_dump();
+ spd_ddr_init_hang();
+ }
+
+ blank_string(strlen(str));
+
+ return 0;
+}
+#else /* defined(CONFIG_NAND_U_BOOT) || defined(CONFIG_NAND_SPL) */
+u32 DQS_autocalibration(void)
+{
+ return 0;
+}
+#endif /* !defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL) */
+#endif /* defined(CONFIG_PPC4xx_DDR_AUTOCALIBRATION) */
--
1.5.5
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