driver/ddr/fsl: Add workaround for DDR erratum A008511
This erratum only applies to general purpose DDR controllers in LS2.
It shouldn't be applied to DP-DDR controller. Check DDRC versoin number
before applying workaround.
Signed-off-by: York Sun <yorksun@freescale.com>
diff --git a/drivers/ddr/fsl/fsl_ddr_gen4.c b/drivers/ddr/fsl/fsl_ddr_gen4.c
index 1d67983..49e4688 100644
--- a/drivers/ddr/fsl/fsl_ddr_gen4.c
+++ b/drivers/ddr/fsl/fsl_ddr_gen4.c
@@ -1,5 +1,5 @@
/*
- * Copyright 2014 Freescale Semiconductor, Inc.
+ * Copyright 2014-2015 Freescale Semiconductor, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
@@ -11,6 +11,22 @@
#include <fsl_immap.h>
#include <fsl_ddr.h>
+#ifdef CONFIG_SYS_FSL_ERRATUM_A008511
+static void set_wait_for_bits_clear(void *ptr, u32 value, u32 bits)
+{
+ int timeout = 1000;
+
+ ddr_out32(ptr, value);
+
+ while (ddr_in32(ptr) & bits) {
+ udelay(100);
+ timeout--;
+ }
+ if (timeout <= 0)
+ puts("Error: A007865 wait for clear timeout.\n");
+}
+#endif /* CONFIG_SYS_FSL_ERRATUM_A008511 */
+
#if (CONFIG_CHIP_SELECTS_PER_CTRL > 4)
#error Invalid setting for CONFIG_CHIP_SELECTS_PER_CTRL
#endif
@@ -36,6 +52,9 @@
defined(CONFIG_SYS_FSL_ERRATUM_A008514)
u32 *eddrtqcr1;
#endif
+#ifdef CONFIG_SYS_FSL_ERRATUM_A008511
+ u32 temp32, mr6;
+#endif
#ifdef CONFIG_FSL_DDR_BIST
u32 mtcr, err_detect, err_sbe;
u32 cs0_bnds, cs1_bnds, cs2_bnds, cs3_bnds, cs0_config;
@@ -221,6 +240,21 @@
ddr_setbits32(ddr->debug[28], 0x9 << 20);
#endif
+#ifdef CONFIG_SYS_FSL_ERRATUM_A008511
+ /* Part 1 of 2 */
+ /* This erraum only applies to verion 5.2.0 */
+ if (fsl_ddr_get_version(ctrl_num) == 0x50200) {
+ /* Disable DRAM VRef training */
+ ddr_out32(&ddr->ddr_cdr2,
+ regs->ddr_cdr2 & ~DDR_CDR2_VREF_TRAIN_EN);
+ /* Disable deskew */
+ ddr_out32(&ddr->debug[28], 0x400);
+ /* Disable D_INIT */
+ ddr_out32(&ddr->sdram_cfg_2,
+ regs->ddr_sdram_cfg_2 & ~SDRAM_CFG2_D_INIT);
+ ddr_out32(&ddr->debug[25], 0x9000);
+ }
+#endif
/*
* For RDIMMs, JEDEC spec requires clocks to be stable before reset is
* deasserted. Clocks start when any chip select is enabled and clock
@@ -268,6 +302,66 @@
mb();
isb();
+#ifdef CONFIG_SYS_FSL_ERRATUM_A008511
+ /* Part 2 of 2 */
+ /* This erraum only applies to verion 5.2.0 */
+ if (fsl_ddr_get_version(ctrl_num) == 0x50200) {
+ /* Wait for idle */
+ timeout = 200;
+ while (!(ddr_in32(&ddr->debug[1]) & 0x2) &&
+ (timeout > 0)) {
+ udelay(100);
+ timeout--;
+ }
+ if (timeout <= 0) {
+ printf("Controler %d timeout, debug_2 = %x\n",
+ ctrl_num, ddr_in32(&ddr->debug[1]));
+ }
+ /* Set VREF */
+ for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
+ if (!(regs->cs[i].config & SDRAM_CS_CONFIG_EN))
+ continue;
+
+ mr6 = (regs->ddr_sdram_mode_10 >> 16) |
+ MD_CNTL_MD_EN |
+ MD_CNTL_CS_SEL(i) |
+ MD_CNTL_MD_SEL(6) |
+ 0x00200000;
+ temp32 = mr6 | 0xc0;
+ set_wait_for_bits_clear(&ddr->sdram_md_cntl,
+ temp32, MD_CNTL_MD_EN);
+ udelay(1);
+ debug("MR6 = 0x%08x\n", temp32);
+ temp32 = mr6 | 0xf0;
+ set_wait_for_bits_clear(&ddr->sdram_md_cntl,
+ temp32, MD_CNTL_MD_EN);
+ udelay(1);
+ debug("MR6 = 0x%08x\n", temp32);
+ temp32 = mr6 | 0x70;
+ set_wait_for_bits_clear(&ddr->sdram_md_cntl,
+ temp32, MD_CNTL_MD_EN);
+ udelay(1);
+ debug("MR6 = 0x%08x\n", temp32);
+ }
+ ddr_out32(&ddr->sdram_md_cntl, 0);
+ ddr_out32(&ddr->debug[28], 0); /* Enable deskew */
+ ddr_out32(&ddr->debug[1], 0x400); /* restart deskew */
+ /* wait for idle */
+ timeout = 200;
+ while (!(ddr_in32(&ddr->debug[1]) & 0x2) &&
+ (timeout > 0)) {
+ udelay(100);
+ timeout--;
+ }
+ if (timeout <= 0) {
+ printf("Controler %d timeout, debug_2 = %x\n",
+ ctrl_num, ddr_in32(&ddr->debug[1]));
+ }
+ /* Restore D_INIT */
+ ddr_out32(&ddr->sdram_cfg_2, regs->ddr_sdram_cfg_2);
+ }
+#endif /* CONFIG_SYS_FSL_ERRATUM_A008511 */
+
total_gb_size_per_controller = 0;
for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
if (!(regs->cs[i].config & 0x80000000))
diff --git a/include/fsl_ddr_sdram.h b/include/fsl_ddr_sdram.h
index 095b33e..6358b6f 100644
--- a/include/fsl_ddr_sdram.h
+++ b/include/fsl_ddr_sdram.h
@@ -155,6 +155,8 @@
#define MD_CNTL_CKE_CNTL_HIGH 0x00200000
#define MD_CNTL_WRCW 0x00080000
#define MD_CNTL_MD_VALUE(x) (x & 0x0000FFFF)
+#define MD_CNTL_CS_SEL(x) (((x) & 0x7) << 28)
+#define MD_CNTL_MD_SEL(x) (((x) & 0xf) << 24)
/* DDR_CDR1 */
#define DDR_CDR1_DHC_EN 0x80000000