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d6bc30af52
The DDR PHY training function, ddrphy_prepare_training() would not work if compiled with GCC 4.9. The struct ddrphy (arch/arm/include/asm/arch-uniphier/ddrphy-regs.h) is specified with __packed because it represents a hardware register mapping, but it turned out to cause a problem on GCC 4.9. If -mno-unaligned-access is specified (yes, it is in arch/arm/cpu/armv7/config.mk), GCC 4.9 is aware of the __attribute__((packed)) and generates extra instructions to perform the memory access in a way that does not cause unaligned access. (Actually it is not need here because the register base, the first argument of the ddrphy_prepare_training(), is always given with a 4-byte aligned address.) Anyway, as a result, readl() / writel() is divided into byte-wise accesses. The problem is that this hardware only accepts 4-byte register access. Byte-wise accesses lead to unexpected behavior. There are some options to avoid this problem. [1] Remove -mno-unaligned-access [2] Add __aligned(4) along with __packed to struct ddrphy [3] Remove __packed from struct ddrphy [1] solves the problem for ARMv7, but it does not for pre-ARMv6 and ARMv6-M architectures where -mno-unaligned-access is default. So, [1] does not seem reasonable in terms of code portability. Both [2] and [3] work well, but [2] seems too much. All the members of struct ddrphy have the u32 type. No padding would be inserted even if __packed is dropped. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com> Reviewed-by: Tom Rini <trini@ti.com>
173 lines
6.8 KiB
C
173 lines
6.8 KiB
C
/*
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* UniPhier DDR PHY registers
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*
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* Copyright (C) 2014 Panasonic Corporation
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* Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef ARCH_DDRPHY_REGS_H
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#define ARCH_DDRPHY_REGS_H
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#include <linux/compiler.h>
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#ifndef __ASSEMBLY__
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struct ddrphy {
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u32 ridr; /* Revision Identification Register */
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u32 pir; /* PHY Initialixation Register */
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u32 pgcr[2]; /* PHY General Configuration Register */
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u32 pgsr[2]; /* PHY General Status Register */
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u32 pllcr; /* PLL Control Register */
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u32 ptr[5]; /* PHY Timing Register */
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u32 acmdlr; /* AC Master Delay Line Register */
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u32 acbdlr; /* AC Bit Delay Line Register */
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u32 aciocr; /* AC I/O Configuration Register */
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u32 dxccr; /* DATX8 Common Configuration Register */
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u32 dsgcr; /* DDR System General Configuration Register */
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u32 dcr; /* DRAM Configuration Register */
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u32 dtpr[3]; /* DRAM Timing Parameters Register */
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u32 mr0; /* Mode Register 0 */
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u32 mr1; /* Mode Register 1 */
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u32 mr2; /* Mode Register 2 */
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u32 mr3; /* Mode Register 3 */
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u32 odtcr; /* ODT Configuration Register */
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u32 dtcr; /* Data Training Configuration Register */
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u32 dtar[4]; /* Data Training Address Register */
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u32 dtdr[2]; /* Data Training Data Register */
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u32 dtedr[2]; /* Data Training Eye Data Register */
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u32 rsv0[13]; /* Reserved */
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u32 dcuar; /* DCU Address Register */
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u32 dcudr; /* DCU Data Register */
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u32 dcurr; /* DCU Run Register */
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u32 dculr; /* DCU Loop Register */
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u32 dcugcr; /* DCU General Configuration Register */
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u32 dcutpr; /* DCU Timing Parameters Register */
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u32 dcusr[2]; /* DCU Status Register */
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u32 rsv1[8]; /* Reserved */
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u32 bistrr; /* BIST Run Register */
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u32 bistwcr; /* BIST Word Count Register */
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u32 bistmskr[3]; /* BIST Mask Register */
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u32 bistlsr; /* BIST LFSR Sed Register */
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u32 bistar[3]; /* BIST Address Register */
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u32 bistudpr; /* BIST User Data Pattern Register */
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u32 bistgsr; /* BIST General Status Register */
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u32 bistwer; /* BIST Word Error Register */
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u32 bistber[4]; /* BIST Bit Error Register */
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u32 bistwcsr; /* BIST Word Count Status Register */
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u32 bistfwr[3]; /* BIST Fail Word Register */
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u32 rsv2[10]; /* Reserved */
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u32 gpr[2]; /* General Purpose Register */
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struct ddrphy_zq { /* ZQ */
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u32 cr[2]; /* Impedance Control Register */
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u32 sr[2]; /* Impedance Status Register */
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} zq[4];
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struct ddrphy_datx8 { /* DATX8 */
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u32 gcr; /* General Configuration Register */
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u32 gsr[2]; /* General Status Register */
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u32 bdlr[5]; /* Bit Delay Line Register */
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u32 lcdlr[3]; /* Local Calibrated Delay Line Register */
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u32 mdlr; /* Master Delay Line Register */
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u32 gtr; /* General Timing Register */
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u32 rsv[3]; /* Reserved */
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} dx[9];
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};
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#endif /* __ASSEMBLY__ */
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#define PIR_INIT (1 << 0) /* Initialization Trigger */
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#define PIR_ZCAL (1 << 1) /* Impedance Calibration */
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#define PIR_PLLINIT (1 << 4) /* PLL Initialization */
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#define PIR_DCAL (1 << 5) /* DDL Calibration */
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#define PIR_PHYRST (1 << 6) /* PHY Reset */
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#define PIR_DRAMRST (1 << 7) /* DRAM Reset */
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#define PIR_DRAMINIT (1 << 8) /* DRAM Initialization */
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#define PIR_WL (1 << 9) /* Write Leveling */
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#define PIR_QSGATE (1 << 10) /* Read DQS Gate Training */
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#define PIR_WLADJ (1 << 11) /* Write Leveling Adjust */
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#define PIR_RDDSKW (1 << 12) /* Read Data Bit Deskew */
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#define PIR_WRDSKW (1 << 13) /* Write Data Bit Deskew */
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#define PIR_RDEYE (1 << 14) /* Read Data Eye Training */
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#define PIR_WREYE (1 << 15) /* Write Data Eye Training */
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#define PIR_LOCKBYP (1 << 28) /* PLL Lock Bypass */
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#define PIR_DCALBYP (1 << 29) /* DDL Calibration Bypass */
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#define PIR_ZCALBYP (1 << 30) /* Impedance Calib Bypass */
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#define PIR_INITBYP (1 << 31) /* Initialization Bypass */
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#define PGSR0_IDONE (1 << 0) /* Initialization Done */
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#define PGSR0_PLDONE (1 << 1) /* PLL Lock Done */
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#define PGSR0_DCDONE (1 << 2) /* DDL Calibration Done */
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#define PGSR0_ZCDONE (1 << 3) /* Impedance Calibration Done */
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#define PGSR0_DIDONE (1 << 4) /* DRAM Initialization Done */
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#define PGSR0_WLDONE (1 << 5) /* Write Leveling Done */
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#define PGSR0_QSGDONE (1 << 6) /* DQS Gate Training Done */
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#define PGSR0_WLADONE (1 << 7) /* Write Leveling Adjust Done */
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#define PGSR0_RDDONE (1 << 8) /* Read Bit Deskew Done */
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#define PGSR0_WDDONE (1 << 9) /* Write Bit Deskew Done */
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#define PGSR0_REDONE (1 << 10) /* Read Eye Training Done */
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#define PGSR0_WEDONE (1 << 11) /* Write Eye Training Done */
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#define PGSR0_IERR (1 << 16) /* Initialization Error */
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#define PGSR0_PLERR (1 << 17) /* PLL Lock Error */
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#define PGSR0_DCERR (1 << 18) /* DDL Calibration Error */
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#define PGSR0_ZCERR (1 << 19) /* Impedance Calib Error */
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#define PGSR0_DIERR (1 << 20) /* DRAM Initialization Error */
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#define PGSR0_WLERR (1 << 21) /* Write Leveling Error */
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#define PGSR0_QSGERR (1 << 22) /* DQS Gate Training Error */
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#define PGSR0_WLAERR (1 << 23) /* Write Leveling Adj Error */
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#define PGSR0_RDERR (1 << 24) /* Read Bit Deskew Error */
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#define PGSR0_WDERR (1 << 25) /* Write Bit Deskew Error */
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#define PGSR0_REERR (1 << 26) /* Read Eye Training Error */
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#define PGSR0_WEERR (1 << 27) /* Write Eye Training Error */
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#define PGSR0_DTERR_SHIFT 28 /* Data Training Error Status*/
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#define PGSR0_DTERR (7 << (PGSR0_DTERR_SHIFT))
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#define PGSR0_APLOCK (1 << 31) /* AC PLL Lock */
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#define DXCCR_DQSRES_OPEN (0 << 5)
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#define DXCCR_DQSRES_688_OHM (1 << 5)
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#define DXCCR_DQSRES_611_OHM (2 << 5)
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#define DXCCR_DQSRES_550_OHM (3 << 5)
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#define DXCCR_DQSRES_500_OHM (4 << 5)
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#define DXCCR_DQSRES_458_OHM (5 << 5)
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#define DXCCR_DQSRES_393_OHM (6 << 5)
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#define DXCCR_DQSRES_344_OHM (7 << 5)
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#define DXCCR_DQSNRES_OPEN (0 << 9)
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#define DXCCR_DQSNRES_688_OHM (1 << 9)
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#define DXCCR_DQSNRES_611_OHM (2 << 9)
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#define DXCCR_DQSNRES_550_OHM (3 << 9)
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#define DXCCR_DQSNRES_500_OHM (4 << 9)
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#define DXCCR_DQSNRES_458_OHM (5 << 9)
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#define DXCCR_DQSNRES_393_OHM (6 << 9)
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#define DXCCR_DQSNRES_344_OHM (7 << 9)
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#define DTCR_DTRANK_SHIFT 4 /* Data Training Rank */
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#define DTCR_DTRANK_MASK (0x3 << (DTCR_DTRANK_SHIFT))
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#define DTCR_DTMPR (1 << 6) /* Data Training using MPR */
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#define DTCR_RNKEN_SHIFT 24 /* Rank Enable */
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#define DTCR_RNKEN_MASK (0xf << (DTCR_RNKEN_SHIFT))
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#define DXGCR_WLRKEN_SHIFT 26 /* Write Level Rank Enable */
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#define DXGCR_WLRKEN_MASK (0xf << (DXGCR_WLRKEN_SHIFT))
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/* SoC-specific parameters */
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#define NR_DATX8_PER_DDRPHY 2
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#if defined(CONFIG_MACH_PH1_LD4) || defined(CONFIG_MACH_PH1_SLD8)
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#define NR_DDRPHY_PER_CH 1
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#else
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#define NR_DDRPHY_PER_CH 2
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#endif
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#define NR_DDRCH 2
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#define DDRPHY_BASE(ch, phy) (0x5bc01000 + 0x200000 * (ch) + 0x1000 * (phy))
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#ifndef __ASSEMBLY__
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void ddrphy_init(struct ddrphy __iomem *phy, int freq, int size);
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void ddrphy_prepare_training(struct ddrphy __iomem *phy, int rank);
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int ddrphy_training(struct ddrphy __iomem *phy);
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#endif
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#endif /* ARCH_DDRPHY_REGS_H */
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