mirror of
https://github.com/AsahiLinux/u-boot
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d024236e5a
We have a large number of places where while we historically referenced gd in the code we no longer do, as well as cases where the code added that line "just in case" during development and never dropped it. Signed-off-by: Tom Rini <trini@konsulko.com>
333 lines
9.3 KiB
C
333 lines
9.3 KiB
C
/*
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* Copyright (C) 2015-2016 Wills Wang <wills.wang@live.com>
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* Based on Atheros LSDK/QSDK
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/addrspace.h>
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#include <asm/types.h>
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#include <mach/ar71xx_regs.h>
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#include <mach/ath79.h>
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#define DDR_CTRL_UPD_EMR3S BIT(5)
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#define DDR_CTRL_UPD_EMR2S BIT(4)
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#define DDR_CTRL_PRECHARGE BIT(3)
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#define DDR_CTRL_AUTO_REFRESH BIT(2)
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#define DDR_CTRL_UPD_EMRS BIT(1)
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#define DDR_CTRL_UPD_MRS BIT(0)
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#define DDR_REFRESH_EN BIT(14)
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#define DDR_REFRESH_M 0x3ff
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#define DDR_REFRESH(x) ((x) & 0x3ff)
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#define DDR_REFRESH_VAL_25M (DDR_REFRESH_EN | DDR_REFRESH(390))
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#define DDR_REFRESH_VAL_40M (DDR_REFRESH_EN | DDR_REFRESH(624))
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#define DDR_TRAS_S 0
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#define DDR_TRAS_M 0x1f
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#define DDR_TRAS(x) ((x) << DDR_TRAS_S)
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#define DDR_TRCD_M 0xf
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#define DDR_TRCD_S 5
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#define DDR_TRCD(x) ((x) << DDR_TRCD_S)
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#define DDR_TRP_M 0xf
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#define DDR_TRP_S 9
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#define DDR_TRP(x) ((x) << DDR_TRP_S)
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#define DDR_TRRD_M 0xf
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#define DDR_TRRD_S 13
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#define DDR_TRRD(x) ((x) << DDR_TRRD_S)
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#define DDR_TRFC_M 0x7f
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#define DDR_TRFC_S 17
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#define DDR_TRFC(x) ((x) << DDR_TRFC_S)
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#define DDR_TMRD_M 0xf
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#define DDR_TMRD_S 23
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#define DDR_TMRD(x) ((x) << DDR_TMRD_S)
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#define DDR_CAS_L_M 0x17
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#define DDR_CAS_L_S 27
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#define DDR_CAS_L(x) (((x) & DDR_CAS_L_M) << DDR_CAS_L_S)
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#define DDR_OPEN BIT(30)
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#define DDR_CONF_REG_VAL (DDR_TRAS(16) | DDR_TRCD(6) | \
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DDR_TRP(6) | DDR_TRRD(4) | \
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DDR_TRFC(30) | DDR_TMRD(15) | \
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DDR_CAS_L(7) | DDR_OPEN)
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#define DDR_BURST_LEN_S 0
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#define DDR_BURST_LEN_M 0xf
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#define DDR_BURST_LEN(x) ((x) << DDR_BURST_LEN_S)
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#define DDR_BURST_TYPE BIT(4)
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#define DDR_CNTL_OE_EN BIT(5)
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#define DDR_PHASE_SEL BIT(6)
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#define DDR_CKE BIT(7)
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#define DDR_TWR_S 8
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#define DDR_TWR_M 0xf
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#define DDR_TWR(x) ((x) << DDR_TWR_S)
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#define DDR_TRTW_S 12
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#define DDR_TRTW_M 0x1f
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#define DDR_TRTW(x) ((x) << DDR_TRTW_S)
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#define DDR_TRTP_S 17
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#define DDR_TRTP_M 0xf
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#define DDR_TRTP(x) ((x) << DDR_TRTP_S)
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#define DDR_TWTR_S 21
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#define DDR_TWTR_M 0x1f
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#define DDR_TWTR(x) ((x) << DDR_TWTR_S)
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#define DDR_G_OPEN_L_S 26
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#define DDR_G_OPEN_L_M 0xf
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#define DDR_G_OPEN_L(x) ((x) << DDR_G_OPEN_L_S)
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#define DDR_HALF_WIDTH_LOW BIT(31)
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#define DDR_CONF2_REG_VAL (DDR_BURST_LEN(8) | DDR_CNTL_OE_EN | \
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DDR_CKE | DDR_TWR(6) | DDR_TRTW(14) | \
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DDR_TRTP(8) | DDR_TWTR(14) | \
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DDR_G_OPEN_L(7) | DDR_HALF_WIDTH_LOW)
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#define DDR2_CONF_TWL_S 10
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#define DDR2_CONF_TWL_M 0xf
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#define DDR2_CONF_TWL(x) (((x) & DDR2_CONF_TWL_M) << DDR2_CONF_TWL_S)
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#define DDR2_CONF_ODT BIT(9)
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#define DDR2_CONF_TFAW_S 2
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#define DDR2_CONF_TFAW_M 0x3f
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#define DDR2_CONF_TFAW(x) (((x) & DDR2_CONF_TFAW_M) << DDR2_CONF_TFAW_S)
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#define DDR2_CONF_EN BIT(0)
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#define DDR2_CONF_VAL (DDR2_CONF_TWL(2) | DDR2_CONF_ODT | \
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DDR2_CONF_TFAW(22) | DDR2_CONF_EN)
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#define DDR1_EXT_MODE_VAL 0x02
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#define DDR2_EXT_MODE_VAL 0x402
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#define DDR2_EXT_MODE_OCD_VAL 0x382
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#define DDR1_MODE_DLL_VAL 0x133
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#define DDR2_MODE_DLL_VAL 0x100
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#define DDR1_MODE_VAL 0x33
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#define DDR2_MODE_VAL 0xa33
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#define DDR_TAP_VAL0 0x08
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#define DDR_TAP_VAL1 0x09
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void ddr_init(void)
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{
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void __iomem *regs;
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u32 val;
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regs = map_physmem(AR71XX_DDR_CTRL_BASE, AR71XX_DDR_CTRL_SIZE,
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MAP_NOCACHE);
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writel(DDR_CONF_REG_VAL, regs + AR71XX_DDR_REG_CONFIG);
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writel(DDR_CONF2_REG_VAL, regs + AR71XX_DDR_REG_CONFIG2);
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val = ath79_get_bootstrap();
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if (val & AR933X_BOOTSTRAP_DDR2) {
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/* AHB maximum timeout */
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writel(0xfffff, regs + AR933X_DDR_REG_TIMEOUT_MAX);
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/* Enable DDR2 */
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writel(DDR2_CONF_VAL, regs + AR933X_DDR_REG_DDR2_CONFIG);
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/* Precharge All */
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writel(DDR_CTRL_PRECHARGE, regs + AR71XX_DDR_REG_CONTROL);
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/* Disable High Temperature Self-Refresh, Full Array */
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writel(0x00, regs + AR933X_DDR_REG_EMR2);
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/* Extended Mode Register 2 Set (EMR2S) */
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writel(DDR_CTRL_UPD_EMR2S, regs + AR71XX_DDR_REG_CONTROL);
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writel(0x00, regs + AR933X_DDR_REG_EMR3);
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/* Extended Mode Register 3 Set (EMR3S) */
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writel(DDR_CTRL_UPD_EMR3S, regs + AR71XX_DDR_REG_CONTROL);
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/* Enable DLL, Full strength, ODT Disabled */
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writel(0x00, regs + AR71XX_DDR_REG_EMR);
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/* Extended Mode Register Set (EMRS) */
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writel(DDR_CTRL_UPD_EMRS, regs + AR71XX_DDR_REG_CONTROL);
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/* Reset DLL */
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writel(DDR2_MODE_DLL_VAL, regs + AR71XX_DDR_REG_MODE);
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/* Mode Register Set (MRS) */
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writel(DDR_CTRL_UPD_MRS, regs + AR71XX_DDR_REG_CONTROL);
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/* Precharge All */
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writel(DDR_CTRL_PRECHARGE, regs + AR71XX_DDR_REG_CONTROL);
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/* Auto Refresh */
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writel(DDR_CTRL_AUTO_REFRESH, regs + AR71XX_DDR_REG_CONTROL);
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writel(DDR_CTRL_AUTO_REFRESH, regs + AR71XX_DDR_REG_CONTROL);
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/* Write recovery (WR) 6 clock, CAS Latency 3, Burst Length 8 */
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writel(DDR2_MODE_VAL, regs + AR71XX_DDR_REG_MODE);
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/* Mode Register Set (MRS) */
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writel(DDR_CTRL_UPD_MRS, regs + AR71XX_DDR_REG_CONTROL);
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/* Enable OCD defaults, Enable DLL, Reduced Drive Strength */
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writel(DDR2_EXT_MODE_OCD_VAL, regs + AR71XX_DDR_REG_EMR);
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/* Extended Mode Register Set (EMRS) */
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writel(DDR_CTRL_UPD_EMRS, regs + AR71XX_DDR_REG_CONTROL);
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/* OCD exit, Enable DLL, Enable /DQS, Reduced Drive Strength */
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writel(DDR2_EXT_MODE_VAL, regs + AR71XX_DDR_REG_EMR);
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/* Extended Mode Register Set (EMRS) */
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writel(DDR_CTRL_UPD_EMRS, regs + AR71XX_DDR_REG_CONTROL);
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/* Refresh time control */
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if (val & AR933X_BOOTSTRAP_REF_CLK_40)
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writel(DDR_REFRESH_VAL_40M, regs +
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AR71XX_DDR_REG_REFRESH);
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else
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writel(DDR_REFRESH_VAL_25M, regs +
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AR71XX_DDR_REG_REFRESH);
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/* DQS 0 Tap Control */
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writel(DDR_TAP_VAL0, regs + AR71XX_DDR_REG_TAP_CTRL0);
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/* DQS 1 Tap Control */
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writel(DDR_TAP_VAL1, regs + AR71XX_DDR_REG_TAP_CTRL1);
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/* For 16-bit DDR */
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writel(0xff, regs + AR71XX_DDR_REG_RD_CYCLE);
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} else {
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/* AHB maximum timeout */
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writel(0xfffff, regs + AR933X_DDR_REG_TIMEOUT_MAX);
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/* Precharge All */
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writel(DDR_CTRL_PRECHARGE, regs + AR71XX_DDR_REG_CONTROL);
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/* Reset DLL, Burst Length 8, CAS Latency 3 */
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writel(DDR1_MODE_DLL_VAL, regs + AR71XX_DDR_REG_MODE);
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/* Forces an MRS update cycle in DDR */
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writel(DDR_CTRL_UPD_MRS, regs + AR71XX_DDR_REG_CONTROL);
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/* Enable DLL, Full strength */
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writel(DDR1_EXT_MODE_VAL, regs + AR71XX_DDR_REG_EMR);
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/* Extended Mode Register Set (EMRS) */
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writel(DDR_CTRL_UPD_EMRS, regs + AR71XX_DDR_REG_CONTROL);
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/* Precharge All */
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writel(DDR_CTRL_PRECHARGE, regs + AR71XX_DDR_REG_CONTROL);
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/* Normal DLL, Burst Length 8, CAS Latency 3 */
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writel(DDR1_MODE_VAL, regs + AR71XX_DDR_REG_MODE);
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/* Mode Register Set (MRS) */
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writel(DDR_CTRL_UPD_MRS, regs + AR71XX_DDR_REG_CONTROL);
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/* Refresh time control */
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if (val & AR933X_BOOTSTRAP_REF_CLK_40)
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writel(DDR_REFRESH_VAL_40M, regs +
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AR71XX_DDR_REG_REFRESH);
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else
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writel(DDR_REFRESH_VAL_25M, regs +
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AR71XX_DDR_REG_REFRESH);
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/* DQS 0 Tap Control */
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writel(DDR_TAP_VAL0, regs + AR71XX_DDR_REG_TAP_CTRL0);
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/* DQS 1 Tap Control */
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writel(DDR_TAP_VAL1, regs + AR71XX_DDR_REG_TAP_CTRL1);
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/* For 16-bit DDR */
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writel(0xff, regs + AR71XX_DDR_REG_RD_CYCLE);
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}
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}
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void ddr_tap_tuning(void)
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{
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void __iomem *regs;
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u32 *addr_k0, *addr_k1, *addr;
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u32 val, tap, upper, lower;
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int i, j, dir, err, done;
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regs = map_physmem(AR71XX_DDR_CTRL_BASE, AR71XX_DDR_CTRL_SIZE,
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MAP_NOCACHE);
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/* Init memory pattern */
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addr = (void *)CKSEG0ADDR(0x2000);
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for (i = 0; i < 256; i++) {
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val = 0;
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for (j = 0; j < 8; j++) {
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if (i & (1 << j)) {
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if (j % 2)
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val |= 0xffff0000;
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else
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val |= 0x0000ffff;
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}
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if (j % 2) {
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*addr++ = val;
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val = 0;
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}
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}
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}
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err = 0;
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done = 0;
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dir = 1;
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tap = readl(regs + AR71XX_DDR_REG_TAP_CTRL0);
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val = tap;
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upper = tap;
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lower = tap;
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while (!done) {
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err = 0;
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/* Update new DDR tap value */
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writel(val, regs + AR71XX_DDR_REG_TAP_CTRL0);
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writel(val, regs + AR71XX_DDR_REG_TAP_CTRL1);
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/* Compare DDR with cache */
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for (i = 0; i < 2; i++) {
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addr_k1 = (void *)CKSEG1ADDR(0x2000);
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addr_k0 = (void *)CKSEG0ADDR(0x2000);
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addr = (void *)CKSEG0ADDR(0x3000);
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while (addr_k0 < addr) {
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if (*addr_k1++ != *addr_k0++) {
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err = 1;
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break;
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}
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}
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if (err)
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break;
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}
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if (err) {
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/* Save upper/lower threshold if error */
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if (dir) {
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dir = 0;
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val--;
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upper = val;
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val = tap;
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} else {
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val++;
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lower = val;
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done = 1;
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}
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} else {
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/* Try the next value until limitation */
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if (dir) {
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if (val < 0x20) {
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val++;
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} else {
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dir = 0;
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upper = val;
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val = tap;
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}
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} else {
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if (!val) {
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lower = val;
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done = 1;
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} else {
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val--;
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}
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}
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}
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}
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/* compute an intermediate value and write back */
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val = (upper + lower) / 2;
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writel(val, regs + AR71XX_DDR_REG_TAP_CTRL0);
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val++;
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writel(val, regs + AR71XX_DDR_REG_TAP_CTRL1);
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}
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