diff options
Diffstat (limited to 'arch/mips/mach-ath79/ar933x/ddr.c')
| -rw-r--r-- | arch/mips/mach-ath79/ar933x/ddr.c | 333 |
1 files changed, 333 insertions, 0 deletions
diff --git a/arch/mips/mach-ath79/ar933x/ddr.c b/arch/mips/mach-ath79/ar933x/ddr.c new file mode 100644 index 0000000000..91452bcc53 --- /dev/null +++ b/arch/mips/mach-ath79/ar933x/ddr.c @@ -0,0 +1,333 @@ +/* + * Copyright (C) 2015-2016 Wills Wang <wills.wang@live.com> + * Based on Atheros LSDK/QSDK + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <asm/io.h> +#include <asm/addrspace.h> +#include <asm/types.h> +#include <mach/ar71xx_regs.h> +#include <mach/reset.h> + +DECLARE_GLOBAL_DATA_PTR; + +#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) & 0x3ff) +#define DDR_REFRESH_VAL_25M (DDR_REFRESH_EN | DDR_REFRESH(390)) +#define DDR_REFRESH_VAL_40M (DDR_REFRESH_EN | DDR_REFRESH(624)) + +#define DDR_TRAS_S 0 +#define DDR_TRAS_M 0x1f +#define DDR_TRAS(x) ((x) << DDR_TRAS_S) +#define DDR_TRCD_M 0xf +#define DDR_TRCD_S 5 +#define DDR_TRCD(x) ((x) << DDR_TRCD_S) +#define DDR_TRP_M 0xf +#define DDR_TRP_S 9 +#define DDR_TRP(x) ((x) << DDR_TRP_S) +#define DDR_TRRD_M 0xf +#define DDR_TRRD_S 13 +#define DDR_TRRD(x) ((x) << DDR_TRRD_S) +#define DDR_TRFC_M 0x7f +#define DDR_TRFC_S 17 +#define DDR_TRFC(x) ((x) << DDR_TRFC_S) +#define DDR_TMRD_M 0xf +#define DDR_TMRD_S 23 +#define DDR_TMRD(x) ((x) << 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 DDR_CONF_REG_VAL (DDR_TRAS(16) | DDR_TRCD(6) | \ + DDR_TRP(6) | DDR_TRRD(4) | \ + DDR_TRFC(30) | DDR_TMRD(15) | \ + DDR_CAS_L(7) | 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_S) +#define DDR_TRTW_S 12 +#define DDR_TRTW_M 0x1f +#define DDR_TRTW(x) ((x) << DDR_TRTW_S) +#define DDR_TRTP_S 17 +#define DDR_TRTP_M 0xf +#define DDR_TRTP(x) ((x) << DDR_TRTP_S) +#define DDR_TWTR_S 21 +#define DDR_TWTR_M 0x1f +#define DDR_TWTR(x) ((x) << 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 DDR_CONF2_REG_VAL (DDR_BURST_LEN(8) | DDR_CNTL_OE_EN | \ + DDR_CKE | DDR_TWR(6) | DDR_TRTW(14) | \ + DDR_TRTP(8) | DDR_TWTR(14) | \ + DDR_G_OPEN_L(7) | DDR_HALF_WIDTH_LOW) + +#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(2) | DDR2_CONF_ODT | \ + DDR2_CONF_TFAW(22) | DDR2_CONF_EN) + +#define DDR1_EXT_MODE_VAL 0x02 +#define DDR2_EXT_MODE_VAL 0x402 +#define DDR2_EXT_MODE_OCD_VAL 0x382 +#define DDR1_MODE_DLL_VAL 0x133 +#define DDR2_MODE_DLL_VAL 0x100 +#define DDR1_MODE_VAL 0x33 +#define DDR2_MODE_VAL 0xa33 +#define DDR_TAP_VAL0 0x08 +#define DDR_TAP_VAL1 0x09 + +void ddr_init(void) +{ + void __iomem *regs; + u32 val; + + regs = map_physmem(AR71XX_DDR_CTRL_BASE, AR71XX_DDR_CTRL_SIZE, + MAP_NOCACHE); + + writel(DDR_CONF_REG_VAL, regs + AR71XX_DDR_REG_CONFIG); + writel(DDR_CONF2_REG_VAL, regs + AR71XX_DDR_REG_CONFIG2); + + val = get_bootstrap(); + if (val & AR933X_BOOTSTRAP_DDR2) { + /* AHB maximum timeout */ + writel(0xfffff, regs + AR933X_DDR_REG_TIMEOUT_MAX); + + /* Enable DDR2 */ + writel(DDR2_CONF_VAL, regs + AR933X_DDR_REG_DDR2_CONFIG); + + /* Precharge All */ + writel(DDR_CTRL_PRECHARGE, regs + AR71XX_DDR_REG_CONTROL); + + /* Disable High Temperature Self-Refresh, Full Array */ + writel(0x00, regs + AR933X_DDR_REG_EMR2); + + /* Extended Mode Register 2 Set (EMR2S) */ + writel(DDR_CTRL_UPD_EMR2S, regs + AR71XX_DDR_REG_CONTROL); + + writel(0x00, regs + AR933X_DDR_REG_EMR3); + + /* Extended Mode Register 3 Set (EMR3S) */ + writel(DDR_CTRL_UPD_EMR3S, regs + AR71XX_DDR_REG_CONTROL); + + /* Enable DLL, Full strength, ODT Disabled */ + writel(0x00, regs + AR71XX_DDR_REG_EMR); + + /* Extended Mode Register Set (EMRS) */ + writel(DDR_CTRL_UPD_EMRS, regs + AR71XX_DDR_REG_CONTROL); + + /* Reset DLL */ + writel(DDR2_MODE_DLL_VAL, regs + AR71XX_DDR_REG_MODE); + + /* Mode Register Set (MRS) */ + writel(DDR_CTRL_UPD_MRS, regs + AR71XX_DDR_REG_CONTROL); + + /* Precharge All */ + writel(DDR_CTRL_PRECHARGE, regs + AR71XX_DDR_REG_CONTROL); + + /* Auto Refresh */ + writel(DDR_CTRL_AUTO_REFRESH, regs + AR71XX_DDR_REG_CONTROL); + writel(DDR_CTRL_AUTO_REFRESH, regs + AR71XX_DDR_REG_CONTROL); + + /* Write recovery (WR) 6 clock, CAS Latency 3, Burst Length 8 */ + writel(DDR2_MODE_VAL, regs + AR71XX_DDR_REG_MODE); + /* Mode Register Set (MRS) */ + writel(DDR_CTRL_UPD_MRS, regs + AR71XX_DDR_REG_CONTROL); + + /* Enable OCD defaults, Enable DLL, Reduced Drive Strength */ + writel(DDR2_EXT_MODE_OCD_VAL, regs + AR71XX_DDR_REG_EMR); + + /* Extended Mode Register Set (EMRS) */ + writel(DDR_CTRL_UPD_EMRS, regs + AR71XX_DDR_REG_CONTROL); + + /* OCD exit, Enable DLL, Enable /DQS, Reduced Drive Strength */ + writel(DDR2_EXT_MODE_VAL, regs + AR71XX_DDR_REG_EMR); + /* Extended Mode Register Set (EMRS) */ + writel(DDR_CTRL_UPD_EMRS, regs + AR71XX_DDR_REG_CONTROL); + + /* Refresh time control */ + if (val & AR933X_BOOTSTRAP_REF_CLK_40) + writel(DDR_REFRESH_VAL_40M, regs + + AR71XX_DDR_REG_REFRESH); + else + writel(DDR_REFRESH_VAL_25M, regs + + AR71XX_DDR_REG_REFRESH); + + /* DQS 0 Tap Control */ + writel(DDR_TAP_VAL0, regs + AR71XX_DDR_REG_TAP_CTRL0); + + /* DQS 1 Tap Control */ + writel(DDR_TAP_VAL1, regs + AR71XX_DDR_REG_TAP_CTRL1); + + /* For 16-bit DDR */ + writel(0xff, regs + AR71XX_DDR_REG_RD_CYCLE); + } else { + /* AHB maximum timeout */ + writel(0xfffff, regs + AR933X_DDR_REG_TIMEOUT_MAX); + + /* Precharge All */ + writel(DDR_CTRL_PRECHARGE, regs + AR71XX_DDR_REG_CONTROL); + + /* Reset DLL, Burst Length 8, CAS Latency 3 */ + writel(DDR1_MODE_DLL_VAL, regs + AR71XX_DDR_REG_MODE); + + /* Forces an MRS update cycle in DDR */ + writel(DDR_CTRL_UPD_MRS, regs + AR71XX_DDR_REG_CONTROL); + + /* Enable DLL, Full strength */ + writel(DDR1_EXT_MODE_VAL, regs + AR71XX_DDR_REG_EMR); + + /* Extended Mode Register Set (EMRS) */ + writel(DDR_CTRL_UPD_EMRS, regs + AR71XX_DDR_REG_CONTROL); + + /* Precharge All */ + writel(DDR_CTRL_PRECHARGE, regs + AR71XX_DDR_REG_CONTROL); + + /* Normal DLL, Burst Length 8, CAS Latency 3 */ + writel(DDR1_MODE_VAL, regs + AR71XX_DDR_REG_MODE); + + /* Mode Register Set (MRS) */ + writel(DDR_CTRL_UPD_MRS, regs + AR71XX_DDR_REG_CONTROL); + + /* Refresh time control */ + if (val & AR933X_BOOTSTRAP_REF_CLK_40) + writel(DDR_REFRESH_VAL_40M, regs + + AR71XX_DDR_REG_REFRESH); + else + writel(DDR_REFRESH_VAL_25M, regs + + AR71XX_DDR_REG_REFRESH); + + /* DQS 0 Tap Control */ + writel(DDR_TAP_VAL0, regs + AR71XX_DDR_REG_TAP_CTRL0); + + /* DQS 1 Tap Control */ + writel(DDR_TAP_VAL1, regs + AR71XX_DDR_REG_TAP_CTRL1); + + /* For 16-bit DDR */ + writel(0xff, regs + AR71XX_DDR_REG_RD_CYCLE); + } +} + +void ddr_tap_tuning(void) +{ + void __iomem *regs; + u32 *addr_k0, *addr_k1, *addr; + u32 val, tap, upper, lower; + int i, j, dir, err, done; + + regs = map_physmem(AR71XX_DDR_CTRL_BASE, AR71XX_DDR_CTRL_SIZE, + MAP_NOCACHE); + + /* Init memory pattern */ + addr = (void *)CKSEG0ADDR(0x2000); + for (i = 0; i < 256; i++) { + val = 0; + for (j = 0; j < 8; j++) { + if (i & (1 << j)) { + if (j % 2) + val |= 0xffff0000; + else + val |= 0x0000ffff; + } + + if (j % 2) { + *addr++ = val; + val = 0; + } + } + } + + err = 0; + done = 0; + dir = 1; + tap = readl(regs + AR71XX_DDR_REG_TAP_CTRL0); + val = tap; + while (!done) { + err = 0; + + /* Update new DDR tap value */ + writel(val, regs + AR71XX_DDR_REG_TAP_CTRL0); + writel(val, regs + AR71XX_DDR_REG_TAP_CTRL1); + + /* Compare DDR with cache */ + for (i = 0; i < 2; i++) { + addr_k1 = (void *)CKSEG1ADDR(0x2000); + addr_k0 = (void *)CKSEG0ADDR(0x2000); + addr = (void *)CKSEG0ADDR(0x3000); + + while (addr_k0 < addr) { + if (*addr_k1++ != *addr_k0++) { + err = 1; + break; + } + } + + if (err) + break; + } + + if (err) { + /* Save upper/lower threshold if error */ + if (dir) { + dir = 0; + val--; + upper = val; + val = tap; + } else { + val++; + lower = val; + done = 1; + } + } else { + /* Try the next value until limitation */ + if (dir) { + if (val < 0x20) { + val++; + } else { + dir = 0; + upper = val; + val = tap; + } + } else { + if (!val) { + lower = val; + done = 1; + } else { + val--; + } + } + } + } + + /* compute an intermediate value and write back */ + val = (upper + lower) / 2; + writel(val, regs + AR71XX_DDR_REG_TAP_CTRL0); + val++; + writel(val, regs + AR71XX_DDR_REG_TAP_CTRL1); +} |