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-rw-r--r--arch/arm/mach-layerscape/errata.c195
1 files changed, 195 insertions, 0 deletions
diff --git a/arch/arm/mach-layerscape/errata.c b/arch/arm/mach-layerscape/errata.c
new file mode 100644
index 0000000..4f4b759
--- /dev/null
+++ b/arch/arm/mach-layerscape/errata.c
@@ -0,0 +1,195 @@
+// SPDX-License-Identifier: GPL-2.0+
+#include <common.h>
+#include <io.h>
+#include <soc/fsl/immap_lsch2.h>
+#include <soc/fsl/fsl_ddr_sdram.h>
+#include <asm/system.h>
+#include <mach/errata.h>
+#include <mach/lowlevel.h>
+
+#define scfg_clrsetbits32(addr, clear, set) clrsetbits_be32(addr, clear, set)
+#define scfg_clrbits32(addr, clear) clrbits_be32(addr, clear)
+
+static inline void set_usb_pcstxswingfull(u32 __iomem *scfg, u32 offset)
+{
+ scfg_clrsetbits32(scfg + offset / 4,
+ 0x7f << 9,
+ SCFG_USB_PCSTXSWINGFULL << 9);
+}
+
+static void erratum_a008997_ls1046a(void)
+{
+ u32 __iomem *scfg = (u32 __iomem *)LSCH2_SCFG_ADDR;
+
+ set_usb_pcstxswingfull(scfg, SCFG_USB3PRM2CR_USB1);
+ set_usb_pcstxswingfull(scfg, SCFG_USB3PRM2CR_USB2);
+ set_usb_pcstxswingfull(scfg, SCFG_USB3PRM2CR_USB3);
+}
+
+#define PROGRAM_USB_PHY_RX_OVRD_IN_HI(phy) \
+ out_be16((phy) + SCFG_USB_PHY_RX_OVRD_IN_HI, USB_PHY_RX_EQ_VAL_1); \
+ out_be16((phy) + SCFG_USB_PHY_RX_OVRD_IN_HI, USB_PHY_RX_EQ_VAL_2); \
+ out_be16((phy) + SCFG_USB_PHY_RX_OVRD_IN_HI, USB_PHY_RX_EQ_VAL_3); \
+ out_be16((phy) + SCFG_USB_PHY_RX_OVRD_IN_HI, USB_PHY_RX_EQ_VAL_4)
+
+static void erratum_a009007_ls1046a(void)
+{
+ void __iomem *usb_phy = IOMEM(SCFG_USB_PHY1);
+
+ PROGRAM_USB_PHY_RX_OVRD_IN_HI(usb_phy);
+ usb_phy = (void __iomem *)SCFG_USB_PHY2;
+ PROGRAM_USB_PHY_RX_OVRD_IN_HI(usb_phy);
+
+ usb_phy = (void __iomem *)SCFG_USB_PHY3;
+ PROGRAM_USB_PHY_RX_OVRD_IN_HI(usb_phy);
+}
+
+static inline void set_usb_txvreftune(u32 __iomem *scfg, u32 offset)
+{
+ scfg_clrsetbits32(scfg + offset / 4, 0xf << 6, SCFG_USB_TXVREFTUNE << 6);
+}
+
+static void erratum_a009008_ls1046a(void)
+{
+ u32 __iomem *scfg = IOMEM(LSCH2_SCFG_ADDR);
+
+ set_usb_txvreftune(scfg, SCFG_USB3PRM1CR_USB1);
+ set_usb_txvreftune(scfg, SCFG_USB3PRM1CR_USB2);
+ set_usb_txvreftune(scfg, SCFG_USB3PRM1CR_USB3);
+}
+
+static inline void set_usb_sqrxtune(u32 __iomem *scfg, u32 offset)
+{
+ scfg_clrbits32(scfg + offset / 4, SCFG_USB_SQRXTUNE_MASK << 23);
+}
+
+static void erratum_a009798_ls1046a(void)
+{
+ u32 __iomem *scfg = IOMEM(LSCH2_SCFG_ADDR);
+
+ set_usb_sqrxtune(scfg, SCFG_USB3PRM1CR_USB1);
+ set_usb_sqrxtune(scfg, SCFG_USB3PRM1CR_USB2);
+ set_usb_sqrxtune(scfg, SCFG_USB3PRM1CR_USB3);
+}
+
+static void erratum_a008850_early(void)
+{
+ /* part 1 of 2 */
+ struct ccsr_cci400 __iomem *cci = IOMEM(LSCH2_CCI400_ADDR);
+ struct ccsr_ddr __iomem *ddr = IOMEM(LSCH2_DDR_ADDR);
+
+ /* Skip if running at lower exception level */
+ if (current_el() < 3)
+ return;
+
+ /* disables propagation of barrier transactions to DDRC from CCI400 */
+ out_le32(&cci->ctrl_ord, CCI400_CTRLORD_TERM_BARRIER);
+
+ /* disable the re-ordering in DDRC */
+ ddr_out32(&ddr->eor, DDR_EOR_RD_REOD_DIS | DDR_EOR_WD_REOD_DIS);
+}
+
+/* erratum_a009942_check_cpo */
+
+void ls1046a_errata(void)
+{
+ erratum_a008850_early();
+ erratum_a009008_ls1046a();
+ erratum_a009798_ls1046a();
+ erratum_a008997_ls1046a();
+ erratum_a009007_ls1046a();
+}
+
+static void erratum_a008850_post(void)
+{
+ /* part 2 of 2 */
+ struct ccsr_cci400 __iomem *cci = IOMEM(LSCH2_CCI400_ADDR);
+ struct ccsr_ddr __iomem *ddr = IOMEM(LSCH2_DDR_ADDR);
+ u32 tmp;
+
+ /* Skip if running at lower exception level */
+ if (current_el() < 3)
+ return;
+
+ /* enable propagation of barrier transactions to DDRC from CCI400 */
+ out_le32(&cci->ctrl_ord, CCI400_CTRLORD_EN_BARRIER);
+
+ /* enable the re-ordering in DDRC */
+ tmp = ddr_in32(&ddr->eor);
+ tmp &= ~(DDR_EOR_RD_REOD_DIS | DDR_EOR_WD_REOD_DIS);
+ ddr_out32(&ddr->eor, tmp);
+}
+
+/*
+ * This additional workaround of A009942 checks the condition to determine if
+ * the CPO value set by the existing A009942 workaround needs to be updated.
+ * If need, print a warning to prompt user reconfigure DDR debug_29[24:31] with
+ * expected optimal value, the optimal value is highly board dependent.
+ */
+static void erratum_a009942_check_cpo(void)
+{
+ struct ccsr_ddr __iomem *ddr =
+ (struct ccsr_ddr __iomem *)(LSCH2_DDR_ADDR);
+ u32 cpo, cpo_e, cpo_o, cpo_target, cpo_optimal;
+ u32 cpo_min = ddr_in32(&ddr->debug[9]) >> 24;
+ u32 cpo_max = cpo_min;
+ u32 sdram_cfg, i, tmp, lanes, ddr_type;
+ bool update_cpo = false, has_ecc = false;
+
+ sdram_cfg = ddr_in32(&ddr->sdram_cfg);
+ if (sdram_cfg & SDRAM_CFG_32_BE)
+ lanes = 4;
+ else if (sdram_cfg & SDRAM_CFG_16_BE)
+ lanes = 2;
+ else
+ lanes = 8;
+
+ if (sdram_cfg & SDRAM_CFG_ECC_EN)
+ has_ecc = true;
+
+ /* determine the maximum and minimum CPO values */
+ for (i = 9; i < 9 + lanes / 2; i++) {
+ cpo = ddr_in32(&ddr->debug[i]);
+ cpo_e = cpo >> 24;
+ cpo_o = (cpo >> 8) & 0xff;
+ tmp = min(cpo_e, cpo_o);
+ if (tmp < cpo_min)
+ cpo_min = tmp;
+ tmp = max(cpo_e, cpo_o);
+ if (tmp > cpo_max)
+ cpo_max = tmp;
+ }
+
+ if (has_ecc) {
+ cpo = ddr_in32(&ddr->debug[13]);
+ cpo = cpo >> 24;
+ if (cpo < cpo_min)
+ cpo_min = cpo;
+ if (cpo > cpo_max)
+ cpo_max = cpo;
+ }
+
+ cpo_target = ddr_in32(&ddr->debug[28]) & 0xff;
+ cpo_optimal = ((cpo_max + cpo_min) >> 1) + 0x27;
+ debug("cpo_optimal = 0x%x, cpo_target = 0x%x\n", cpo_optimal,
+ cpo_target);
+ debug("cpo_max = 0x%x, cpo_min = 0x%x\n", cpo_max, cpo_min);
+
+ ddr_type = (sdram_cfg & SDRAM_CFG_SDRAM_TYPE_MASK) >>
+ SDRAM_CFG_SDRAM_TYPE_SHIFT;
+ if (ddr_type == SDRAM_TYPE_DDR4)
+ update_cpo = (cpo_min + 0x3b) < cpo_target ? true : false;
+ else if (ddr_type == SDRAM_TYPE_DDR3)
+ update_cpo = (cpo_min + 0x3f) < cpo_target ? true : false;
+
+ if (update_cpo) {
+ printf("WARN: pls set popts->cpo_sample = 0x%x ", cpo_optimal);
+ printf("in <board>/ddr.c to optimize cpo\n");
+ }
+}
+
+void ls1046a_errata_post_ddr(void)
+{
+ erratum_a008850_post();
+ erratum_a009942_check_cpo();
+}