| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * Copyright (C) 2015-2016 Wills Wang <wills.wang@live.com> |
| * Based on Atheros LSDK/QSDK |
| */ |
| |
| #include <common.h> |
| #include <asm/io.h> |
| #include <asm/addrspace.h> |
| #include <asm/types.h> |
| #include <mach/ar71xx_regs.h> |
| #include <mach/ath79.h> |
| |
| #define DDR_CTRL_UPD_EMR3S BIT(5) |
| #define DDR_CTRL_UPD_EMR2S BIT(4) |
| #define DDR_CTRL_PRECHARGE BIT(3) |
| #define DDR_CTRL_AUTO_REFRESH BIT(2) |
| #define DDR_CTRL_UPD_EMRS BIT(1) |
| #define DDR_CTRL_UPD_MRS BIT(0) |
| |
| #define DDR_REFRESH_EN BIT(14) |
| #define DDR_REFRESH_M 0x3ff |
| #define DDR_REFRESH(x) ((x) & DDR_REFRESH_M) |
| #define DDR_REFRESH_VAL (DDR_REFRESH_EN | DDR_REFRESH(312)) |
| |
| #define DDR_TRAS_S 0 |
| #define DDR_TRAS_M 0x1f |
| #define DDR_TRAS(x) (((x) & DDR_TRAS_M) << DDR_TRAS_S) |
| #define DDR_TRCD_M 0xf |
| #define DDR_TRCD_S 5 |
| #define DDR_TRCD(x) (((x) & DDR_TRCD_M) << DDR_TRCD_S) |
| #define DDR_TRP_M 0xf |
| #define DDR_TRP_S 9 |
| #define DDR_TRP(x) (((x) & DDR_TRP_M) << DDR_TRP_S) |
| #define DDR_TRRD_M 0xf |
| #define DDR_TRRD_S 13 |
| #define DDR_TRRD(x) (((x) & DDR_TRRD_M) << DDR_TRRD_S) |
| #define DDR_TRFC_M 0x7f |
| #define DDR_TRFC_S 17 |
| #define DDR_TRFC(x) (((x) & DDR_TRFC_M) << DDR_TRFC_S) |
| #define DDR_TMRD_M 0xf |
| #define DDR_TMRD_S 23 |
| #define DDR_TMRD(x) (((x) & DDR_TMRD_M) << DDR_TMRD_S) |
| #define DDR_CAS_L_M 0x17 |
| #define DDR_CAS_L_S 27 |
| #define DDR_CAS_L(x) (((x) & DDR_CAS_L_M) << DDR_CAS_L_S) |
| #define DDR_OPEN BIT(30) |
| #define DDR1_CONF_REG_VAL (DDR_TRAS(16) | DDR_TRCD(6) | \ |
| DDR_TRP(6) | DDR_TRRD(4) | \ |
| DDR_TRFC(7) | DDR_TMRD(5) | \ |
| DDR_CAS_L(7) | DDR_OPEN) |
| #define DDR2_CONF_REG_VAL (DDR_TRAS(27) | DDR_TRCD(9) | \ |
| DDR_TRP(9) | DDR_TRRD(7) | \ |
| DDR_TRFC(21) | DDR_TMRD(15) | \ |
| DDR_CAS_L(17) | DDR_OPEN) |
| |
| #define DDR_BURST_LEN_S 0 |
| #define DDR_BURST_LEN_M 0xf |
| #define DDR_BURST_LEN(x) ((x) << DDR_BURST_LEN_S) |
| #define DDR_BURST_TYPE BIT(4) |
| #define DDR_CNTL_OE_EN BIT(5) |
| #define DDR_PHASE_SEL BIT(6) |
| #define DDR_CKE BIT(7) |
| #define DDR_TWR_S 8 |
| #define DDR_TWR_M 0xf |
| #define DDR_TWR(x) (((x) & DDR_TWR_M) << DDR_TWR_S) |
| #define DDR_TRTW_S 12 |
| #define DDR_TRTW_M 0x1f |
| #define DDR_TRTW(x) (((x) & DDR_TRTW_M) << DDR_TRTW_S) |
| #define DDR_TRTP_S 17 |
| #define DDR_TRTP_M 0xf |
| #define DDR_TRTP(x) (((x) & DDR_TRTP_M) << DDR_TRTP_S) |
| #define DDR_TWTR_S 21 |
| #define DDR_TWTR_M 0x1f |
| #define DDR_TWTR(x) (((x) & DDR_TWTR_M) << DDR_TWTR_S) |
| #define DDR_G_OPEN_L_S 26 |
| #define DDR_G_OPEN_L_M 0xf |
| #define DDR_G_OPEN_L(x) ((x) << DDR_G_OPEN_L_S) |
| #define DDR_HALF_WIDTH_LOW BIT(31) |
| #define DDR1_CONF2_REG_VAL (DDR_BURST_LEN(8) | DDR_CNTL_OE_EN | \ |
| DDR_CKE | DDR_TWR(13) | DDR_TRTW(14) | \ |
| DDR_TRTP(8) | DDR_TWTR(14) | \ |
| DDR_G_OPEN_L(6) | DDR_HALF_WIDTH_LOW) |
| #define DDR2_CONF2_REG_VAL (DDR_BURST_LEN(8) | DDR_CNTL_OE_EN | \ |
| DDR_CKE | DDR_TWR(1) | DDR_TRTW(14) | \ |
| DDR_TRTP(9) | DDR_TWTR(21) | \ |
| DDR_G_OPEN_L(8) | DDR_HALF_WIDTH_LOW) |
| |
| #define DDR_TWR_MSB BIT(3) |
| #define DDR_TRAS_MSB BIT(2) |
| #define DDR_TRFC_MSB_M 0x3 |
| #define DDR_TRFC_MSB(x) (x) |
| #define DDR1_CONF3_REG_VAL 0 |
| #define DDR2_CONF3_REG_VAL (DDR_TWR_MSB | DDR_TRFC_MSB(2)) |
| |
| #define DDR_CTL_SRAM_TSEL BIT(30) |
| #define DDR_CTL_SRAM_GE0_SYNC BIT(20) |
| #define DDR_CTL_SRAM_GE1_SYNC BIT(19) |
| #define DDR_CTL_SRAM_USB_SYNC BIT(18) |
| #define DDR_CTL_SRAM_PCIE_SYNC BIT(17) |
| #define DDR_CTL_SRAM_WMAC_SYNC BIT(16) |
| #define DDR_CTL_SRAM_MISC1_SYNC BIT(15) |
| #define DDR_CTL_SRAM_MISC2_SYNC BIT(14) |
| #define DDR_CTL_PAD_DDR2_SEL BIT(6) |
| #define DDR_CTL_HALF_WIDTH BIT(1) |
| #define DDR_CTL_CONFIG_VAL (DDR_CTL_SRAM_TSEL | \ |
| DDR_CTL_SRAM_GE0_SYNC | \ |
| DDR_CTL_SRAM_GE1_SYNC | \ |
| DDR_CTL_SRAM_USB_SYNC | \ |
| DDR_CTL_SRAM_PCIE_SYNC | \ |
| DDR_CTL_SRAM_WMAC_SYNC | \ |
| DDR_CTL_HALF_WIDTH) |
| |
| #define DDR_BURST_GE0_MAX_BL_S 0 |
| #define DDR_BURST_GE0_MAX_BL_M 0xf |
| #define DDR_BURST_GE0_MAX_BL(x) \ |
| (((x) & DDR_BURST_GE0_MAX_BL_M) << DDR_BURST_GE0_MAX_BL_S) |
| #define DDR_BURST_GE1_MAX_BL_S 4 |
| #define DDR_BURST_GE1_MAX_BL_M 0xf |
| #define DDR_BURST_GE1_MAX_BL(x) \ |
| (((x) & DDR_BURST_GE1_MAX_BL_M) << DDR_BURST_GE1_MAX_BL_S) |
| #define DDR_BURST_PCIE_MAX_BL_S 8 |
| #define DDR_BURST_PCIE_MAX_BL_M 0xf |
| #define DDR_BURST_PCIE_MAX_BL(x) \ |
| (((x) & DDR_BURST_PCIE_MAX_BL_M) << DDR_BURST_PCIE_MAX_BL_S) |
| #define DDR_BURST_USB_MAX_BL_S 12 |
| #define DDR_BURST_USB_MAX_BL_M 0xf |
| #define DDR_BURST_USB_MAX_BL(x) \ |
| (((x) & DDR_BURST_USB_MAX_BL_M) << DDR_BURST_USB_MAX_BL_S) |
| #define DDR_BURST_CPU_MAX_BL_S 16 |
| #define DDR_BURST_CPU_MAX_BL_M 0xf |
| #define DDR_BURST_CPU_MAX_BL(x) \ |
| (((x) & DDR_BURST_CPU_MAX_BL_M) << DDR_BURST_CPU_MAX_BL_S) |
| #define DDR_BURST_RD_MAX_BL_S 20 |
| #define DDR_BURST_RD_MAX_BL_M 0xf |
| #define DDR_BURST_RD_MAX_BL(x) \ |
| (((x) & DDR_BURST_RD_MAX_BL_M) << DDR_BURST_RD_MAX_BL_S) |
| #define DDR_BURST_WR_MAX_BL_S 24 |
| #define DDR_BURST_WR_MAX_BL_M 0xf |
| #define DDR_BURST_WR_MAX_BL(x) \ |
| (((x) & DDR_BURST_WR_MAX_BL_M) << DDR_BURST_WR_MAX_BL_S) |
| #define DDR_BURST_RWP_MASK_EN_S 28 |
| #define DDR_BURST_RWP_MASK_EN_M 0x3 |
| #define DDR_BURST_RWP_MASK_EN(x) \ |
| (((x) & DDR_BURST_RWP_MASK_EN_M) << DDR_BURST_RWP_MASK_EN_S) |
| #define DDR_BURST_CPU_PRI_BE BIT(30) |
| #define DDR_BURST_CPU_PRI BIT(31) |
| #define DDR_BURST_VAL (DDR_BURST_CPU_PRI_BE | \ |
| DDR_BURST_RWP_MASK_EN(3) | \ |
| DDR_BURST_WR_MAX_BL(4) | \ |
| DDR_BURST_RD_MAX_BL(4) | \ |
| DDR_BURST_CPU_MAX_BL(4) | \ |
| DDR_BURST_USB_MAX_BL(4) | \ |
| DDR_BURST_PCIE_MAX_BL(4) | \ |
| DDR_BURST_GE1_MAX_BL(4) | \ |
| DDR_BURST_GE0_MAX_BL(4)) |
| |
| #define DDR_BURST_WMAC_MAX_BL_S 0 |
| #define DDR_BURST_WMAC_MAX_BL_M 0xf |
| #define DDR_BURST_WMAC_MAX_BL(x) \ |
| (((x) & DDR_BURST_WMAC_MAX_BL_M) << DDR_BURST_WMAC_MAX_BL_S) |
| #define DDR_BURST2_VAL DDR_BURST_WMAC_MAX_BL(4) |
| |
| #define DDR2_CONF_TWL_S 10 |
| #define DDR2_CONF_TWL_M 0xf |
| #define DDR2_CONF_TWL(x) \ |
| (((x) & DDR2_CONF_TWL_M) << DDR2_CONF_TWL_S) |
| #define DDR2_CONF_ODT BIT(9) |
| #define DDR2_CONF_TFAW_S 2 |
| #define DDR2_CONF_TFAW_M 0x3f |
| #define DDR2_CONF_TFAW(x) \ |
| (((x) & DDR2_CONF_TFAW_M) << DDR2_CONF_TFAW_S) |
| #define DDR2_CONF_EN BIT(0) |
| #define DDR2_CONF_VAL (DDR2_CONF_TWL(5) | \ |
| DDR2_CONF_TFAW(31) | \ |
| DDR2_CONF_ODT | \ |
| DDR2_CONF_EN) |
| |
| #define DDR1_EXT_MODE_VAL 0 |
| #define DDR2_EXT_MODE_VAL 0x402 |
| #define DDR2_EXT_MODE_OCD_VAL 0x782 |
| #define DDR1_MODE_DLL_VAL 0x133 |
| #define DDR2_MODE_DLL_VAL 0x143 |
| #define DDR1_MODE_VAL 0x33 |
| #define DDR2_MODE_VAL 0x43 |
| #define DDR1_TAP_VAL 0x20 |
| #define DDR2_TAP_VAL 0x10 |
| |
| #define DDR_REG_BIST_MASK_ADDR_0 0x2c |
| #define DDR_REG_BIST_MASK_ADDR_1 0x30 |
| #define DDR_REG_BIST_MASK_AHB_GE0_0 0x34 |
| #define DDR_REG_BIST_COMP_AHB_GE0_0 0x38 |
| #define DDR_REG_BIST_MASK_AHB_GE1_0 0x3c |
| #define DDR_REG_BIST_COMP_AHB_GE1_0 0x40 |
| #define DDR_REG_BIST_COMP_ADDR_0 0x64 |
| #define DDR_REG_BIST_COMP_ADDR_1 0x68 |
| #define DDR_REG_BIST_MASK_AHB_GE0_1 0x6c |
| #define DDR_REG_BIST_COMP_AHB_GE0_1 0x70 |
| #define DDR_REG_BIST_MASK_AHB_GE1_1 0x74 |
| #define DDR_REG_BIST_COMP_AHB_GE1_1 0x78 |
| #define DDR_REG_BIST 0x11c |
| #define DDR_REG_BIST_STATUS 0x120 |
| |
| #define DDR_BIST_COMP_CNT_S 1 |
| #define DDR_BIST_COMP_CNT_M 0xff |
| #define DDR_BIST_COMP_CNT(x) \ |
| (((x) & DDR_BIST_COMP_CNT_M) << DDR_BIST_COMP_CNT_S) |
| #define DDR_BIST_COMP_CNT_MASK \ |
| (DDR_BIST_COMP_CNT_M << DDR_BIST_COMP_CNT_S) |
| #define DDR_BIST_TEST_START BIT(0) |
| #define DDR_BIST_STATUS_DONE BIT(0) |
| |
| /* 4 Row Address Bits, 4 Column Address Bits, 2 BA bits */ |
| #define DDR_BIST_MASK_ADDR_VAL 0xfa5de83f |
| |
| #define DDR_TAP_MAGIC_VAL 0xaa55aa55 |
| #define DDR_TAP_MAX_VAL 0x40 |
| |
| void ddr_init(void) |
| { |
| void __iomem *regs; |
| u32 val; |
| |
| regs = map_physmem(AR71XX_DDR_CTRL_BASE, AR71XX_DDR_CTRL_SIZE, |
| MAP_NOCACHE); |
| val = ath79_get_bootstrap(); |
| if (val & QCA953X_BOOTSTRAP_DDR1) { |
| writel(DDR_CTL_CONFIG_VAL, regs + QCA953X_DDR_REG_CTL_CONF); |
| udelay(10); |
| |
| /* For 16-bit DDR */ |
| writel(0xffff, regs + AR71XX_DDR_REG_RD_CYCLE); |
| udelay(100); |
| |
| /* Burst size */ |
| writel(DDR_BURST_VAL, regs + QCA953X_DDR_REG_BURST); |
| udelay(100); |
| writel(DDR_BURST2_VAL, regs + QCA953X_DDR_REG_BURST2); |
| udelay(100); |
| |
| /* AHB maximum timeout */ |
| writel(0xfffff, regs + QCA953X_DDR_REG_TIMEOUT_MAX); |
| udelay(100); |
| |
| /* DRAM timing */ |
| writel(DDR1_CONF_REG_VAL, regs + AR71XX_DDR_REG_CONFIG); |
| udelay(100); |
| writel(DDR1_CONF2_REG_VAL, regs + AR71XX_DDR_REG_CONFIG2); |
| udelay(100); |
| writel(DDR1_CONF3_REG_VAL, regs + QCA953X_DDR_REG_CONFIG3); |
| udelay(100); |
| |
| /* Precharge All */ |
| writel(DDR_CTRL_PRECHARGE, regs + AR71XX_DDR_REG_CONTROL); |
| udelay(100); |
| |
| /* ODT disable, Full strength, Enable DLL */ |
| writel(DDR1_EXT_MODE_VAL, regs + AR71XX_DDR_REG_EMR); |
| udelay(100); |
| |
| /* Update Extended Mode Register Set (EMRS) */ |
| writel(DDR_CTRL_UPD_EMRS, regs + AR71XX_DDR_REG_CONTROL); |
| udelay(100); |
| |
| /* Reset DLL, CAS Latency 3, Burst Length 8 */ |
| writel(DDR1_MODE_DLL_VAL, regs + AR71XX_DDR_REG_MODE); |
| udelay(100); |
| |
| /* Update Mode Register Set (MRS) */ |
| writel(DDR_CTRL_UPD_MRS, regs + AR71XX_DDR_REG_CONTROL); |
| udelay(100); |
| |
| /* Precharge All */ |
| writel(DDR_CTRL_PRECHARGE, regs + AR71XX_DDR_REG_CONTROL); |
| udelay(100); |
| |
| /* Auto Refresh */ |
| writel(DDR_CTRL_AUTO_REFRESH, regs + AR71XX_DDR_REG_CONTROL); |
| udelay(100); |
| writel(DDR_CTRL_AUTO_REFRESH, regs + AR71XX_DDR_REG_CONTROL); |
| udelay(100); |
| |
| /* Normal DLL, CAS Latency 3, Burst Length 8 */ |
| writel(DDR1_MODE_VAL, regs + AR71XX_DDR_REG_MODE); |
| udelay(100); |
| |
| /* Update Mode Register Set (MRS) */ |
| writel(DDR_CTRL_UPD_MRS, regs + AR71XX_DDR_REG_CONTROL); |
| udelay(100); |
| |
| /* Refresh time control */ |
| writel(DDR_REFRESH_VAL, regs + AR71XX_DDR_REG_REFRESH); |
| udelay(100); |
| |
| /* DQS 0 Tap Control */ |
| writel(DDR1_TAP_VAL, regs + AR71XX_DDR_REG_TAP_CTRL0); |
| |
| /* DQS 1 Tap Control */ |
| writel(DDR1_TAP_VAL, regs + AR71XX_DDR_REG_TAP_CTRL1); |
| } else { |
| writel(DDR_CTRL_UPD_EMR2S, regs + AR71XX_DDR_REG_CONTROL); |
| udelay(10); |
| writel(DDR_CTRL_UPD_EMR3S, regs + AR71XX_DDR_REG_CONTROL); |
| udelay(10); |
| writel(DDR_CTL_CONFIG_VAL | DDR_CTL_PAD_DDR2_SEL, |
| regs + QCA953X_DDR_REG_CTL_CONF); |
| udelay(10); |
| |
| /* For 16-bit DDR */ |
| writel(0xffff, regs + AR71XX_DDR_REG_RD_CYCLE); |
| udelay(100); |
| |
| /* Burst size */ |
| writel(DDR_BURST_VAL, regs + QCA953X_DDR_REG_BURST); |
| udelay(100); |
| writel(DDR_BURST2_VAL, regs + QCA953X_DDR_REG_BURST2); |
| udelay(100); |
| |
| /* AHB maximum timeout */ |
| writel(0xfffff, regs + QCA953X_DDR_REG_TIMEOUT_MAX); |
| udelay(100); |
| |
| /* DRAM timing */ |
| writel(DDR2_CONF_REG_VAL, regs + AR71XX_DDR_REG_CONFIG); |
| udelay(100); |
| writel(DDR2_CONF2_REG_VAL, regs + AR71XX_DDR_REG_CONFIG2); |
| udelay(100); |
| writel(DDR2_CONF3_REG_VAL, regs + QCA953X_DDR_REG_CONFIG3); |
| udelay(100); |
| |
| /* Enable DDR2 */ |
| writel(DDR2_CONF_VAL, regs + QCA953X_DDR_REG_DDR2_CONFIG); |
| udelay(100); |
| |
| /* Precharge All */ |
| writel(DDR_CTRL_PRECHARGE, regs + AR71XX_DDR_REG_CONTROL); |
| udelay(100); |
| |
| /* Update Extended Mode Register 2 Set (EMR2S) */ |
| writel(DDR_CTRL_UPD_EMR2S, regs + AR71XX_DDR_REG_CONTROL); |
| udelay(100); |
| |
| /* Update Extended Mode Register 3 Set (EMR3S) */ |
| writel(DDR_CTRL_UPD_EMR3S, regs + AR71XX_DDR_REG_CONTROL); |
| udelay(100); |
| |
| /* 150 ohm, Reduced strength, Enable DLL */ |
| writel(DDR2_EXT_MODE_VAL, regs + AR71XX_DDR_REG_EMR); |
| udelay(100); |
| |
| /* Update Extended Mode Register Set (EMRS) */ |
| writel(DDR_CTRL_UPD_EMRS, regs + AR71XX_DDR_REG_CONTROL); |
| udelay(100); |
| |
| /* Reset DLL, CAS Latency 4, Burst Length 8 */ |
| writel(DDR2_MODE_DLL_VAL, regs + AR71XX_DDR_REG_MODE); |
| udelay(100); |
| |
| /* Update Mode Register Set (MRS) */ |
| writel(DDR_CTRL_UPD_MRS, regs + AR71XX_DDR_REG_CONTROL); |
| udelay(100); |
| |
| /* Precharge All */ |
| writel(DDR_CTRL_PRECHARGE, regs + AR71XX_DDR_REG_CONTROL); |
| udelay(100); |
| |
| /* Auto Refresh */ |
| writel(DDR_CTRL_AUTO_REFRESH, regs + AR71XX_DDR_REG_CONTROL); |
| udelay(100); |
| writel(DDR_CTRL_AUTO_REFRESH, regs + AR71XX_DDR_REG_CONTROL); |
| udelay(100); |
| |
| /* Normal DLL, CAS Latency 4, Burst Length 8 */ |
| writel(DDR2_MODE_VAL, regs + AR71XX_DDR_REG_MODE); |
| udelay(100); |
| |
| /* Mode Register Set (MRS) */ |
| writel(DDR_CTRL_UPD_MRS, regs + AR71XX_DDR_REG_CONTROL); |
| udelay(100); |
| |
| /* Enable OCD, Enable DLL, Reduced Drive Strength */ |
| writel(DDR2_EXT_MODE_OCD_VAL, regs + AR71XX_DDR_REG_EMR); |
| udelay(100); |
| |
| /* Update Extended Mode Register Set (EMRS) */ |
| writel(DDR_CTRL_UPD_EMRS, regs + AR71XX_DDR_REG_CONTROL); |
| udelay(100); |
| |
| /* OCD diable, Enable DLL, Reduced Drive Strength */ |
| writel(DDR2_EXT_MODE_VAL, regs + AR71XX_DDR_REG_EMR); |
| udelay(100); |
| |
| /* Update Extended Mode Register Set (EMRS) */ |
| writel(DDR_CTRL_UPD_EMRS, regs + AR71XX_DDR_REG_CONTROL); |
| udelay(100); |
| |
| /* Refresh time control */ |
| writel(DDR_REFRESH_VAL, regs + AR71XX_DDR_REG_REFRESH); |
| udelay(100); |
| |
| /* DQS 0 Tap Control */ |
| writel(DDR2_TAP_VAL, regs + AR71XX_DDR_REG_TAP_CTRL0); |
| |
| /* DQS 1 Tap Control */ |
| writel(DDR2_TAP_VAL, regs + AR71XX_DDR_REG_TAP_CTRL1); |
| } |
| } |
| |
| void ddr_tap_tuning(void) |
| { |
| void __iomem *regs; |
| u32 val, pass, tap, cnt, tap_val, last, first; |
| |
| regs = map_physmem(AR71XX_DDR_CTRL_BASE, AR71XX_DDR_CTRL_SIZE, |
| MAP_NOCACHE); |
| |
| tap_val = readl(regs + AR71XX_DDR_REG_TAP_CTRL0); |
| first = DDR_TAP_MAGIC_VAL; |
| last = 0; |
| cnt = 0; |
| tap = 0; |
| |
| do { |
| writel(tap, regs + AR71XX_DDR_REG_TAP_CTRL0); |
| writel(tap, regs + AR71XX_DDR_REG_TAP_CTRL1); |
| |
| writel(DDR_BIST_COMP_CNT(8), regs + DDR_REG_BIST_COMP_ADDR_1); |
| writel(DDR_BIST_MASK_ADDR_VAL, regs + DDR_REG_BIST_MASK_ADDR_0); |
| writel(0xffff, regs + DDR_REG_BIST_COMP_AHB_GE0_1); |
| writel(0xffff, regs + DDR_REG_BIST_COMP_AHB_GE1_0); |
| writel(0xffff, regs + DDR_REG_BIST_COMP_AHB_GE1_1); |
| writel(0xffff, regs + DDR_REG_BIST_MASK_AHB_GE0_0); |
| writel(0xffff, regs + DDR_REG_BIST_MASK_AHB_GE0_1); |
| writel(0xffff, regs + DDR_REG_BIST_MASK_AHB_GE1_0); |
| writel(0xffff, regs + DDR_REG_BIST_MASK_AHB_GE1_1); |
| writel(0xffff, regs + DDR_REG_BIST_COMP_AHB_GE0_0); |
| |
| /* Start BIST test */ |
| writel(DDR_BIST_TEST_START, regs + DDR_REG_BIST); |
| |
| do { |
| val = readl(regs + DDR_REG_BIST_STATUS); |
| } while (!(val & DDR_BIST_STATUS_DONE)); |
| |
| /* Stop BIST test */ |
| writel(0, regs + DDR_REG_BIST); |
| |
| pass = val & DDR_BIST_COMP_CNT_MASK; |
| pass ^= DDR_BIST_COMP_CNT(8); |
| if (!pass) { |
| if (first != DDR_TAP_MAGIC_VAL) { |
| last = tap; |
| } else { |
| first = tap; |
| last = tap; |
| } |
| cnt++; |
| } |
| tap++; |
| } while (tap < DDR_TAP_MAX_VAL); |
| |
| if (cnt) { |
| tap_val = (first + last) / 2; |
| tap_val %= DDR_TAP_MAX_VAL; |
| } |
| |
| writel(tap_val, regs + AR71XX_DDR_REG_TAP_CTRL0); |
| writel(tap_val, regs + AR71XX_DDR_REG_TAP_CTRL1); |
| } |
