memory: tegra: Add EMC (external memory controller) driver

Implements functionality needed to change the rate of the memory bus
clock.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

3 files changed, 1104 insertions, 0 deletions

diff --git a/drivers/memory/tegra/Kconfig b/drivers/memory/tegra/Kconfig
index 571087621827..6d74e499e18d 100644
--- a/drivers/memory/tegra/Kconfig
+++ b/drivers/memory/tegra/Kconfig
@@ -5,3 +5,13 @@ config TEGRA_MC
         help
           This driver supports the Memory Controller (MC) hardware found on
           NVIDIA Tegra SoCs.
+
+config TEGRA124_EMC
+        bool "NVIDIA Tegra124 External Memory Controller driver"
+        default y
+        depends on TEGRA_MC && ARCH_TEGRA_124_SOC
+        help
+          This driver is for the External Memory Controller (EMC) found on
+          Tegra124 chips. The EMC controls the external DRAM on the board.
+          This driver is required to change memory timings / clock rate for
+          external memory.
diff --git a/drivers/memory/tegra/Makefile b/drivers/memory/tegra/Makefile
index 0d9f497b786c..c0129602ffd4 100644
--- a/drivers/memory/tegra/Makefile
+++ b/drivers/memory/tegra/Makefile
@@ -5,3 +5,5 @@ tegra-mc-$(CONFIG_ARCH_TEGRA_114_SOC) += tegra114.o
 tegra-mc-$(CONFIG_ARCH_TEGRA_124_SOC) += tegra124.o
 
 obj-$(CONFIG_TEGRA_MC) += tegra-mc.o
+
+obj-$(CONFIG_TEGRA124_EMC) += tegra124-emc.o
diff --git a/drivers/memory/tegra/tegra124-emc.c b/drivers/memory/tegra/tegra124-emc.c
new file mode 100644
index 000000000000..900504c01a64
--- /dev/null
+++ b/drivers/memory/tegra/tegra124-emc.c
@@ -0,0 +1,1092 @@
+/*
+ * Copyright (c) 2014, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Author:
+ *      Mikko Perttunen <mperttunen@nvidia.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/delay.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/sort.h>
+#include <linux/string.h>
+
+#include <soc/tegra/emc.h>
+#include <soc/tegra/fuse.h>
+#include <soc/tegra/mc.h>
+
+#define EMC_FBIO_CFG5                           0x104
+#define EMC_FBIO_CFG5_DRAM_TYPE_MASK            0x3
+#define EMC_FBIO_CFG5_DRAM_TYPE_SHIFT           0
+
+#define EMC_INTSTATUS                           0x0
+#define EMC_INTSTATUS_CLKCHANGE_COMPLETE        BIT(4)
+
+#define EMC_CFG                                 0xc
+#define EMC_CFG_DRAM_CLKSTOP_PD                 BIT(31)
+#define EMC_CFG_DRAM_CLKSTOP_SR                 BIT(30)
+#define EMC_CFG_DRAM_ACPD                       BIT(29)
+#define EMC_CFG_DYN_SREF                        BIT(28)
+#define EMC_CFG_PWR_MASK                        ((0xF << 28) | BIT(18))
+#define EMC_CFG_DSR_VTTGEN_DRV_EN               BIT(18)
+
+#define EMC_REFCTRL                             0x20
+#define EMC_REFCTRL_DEV_SEL_SHIFT               0
+#define EMC_REFCTRL_ENABLE                      BIT(31)
+
+#define EMC_TIMING_CONTROL                      0x28
+#define EMC_RC                                  0x2c
+#define EMC_RFC                                 0x30
+#define EMC_RAS                                 0x34
+#define EMC_RP                                  0x38
+#define EMC_R2W                                 0x3c
+#define EMC_W2R                                 0x40
+#define EMC_R2P                                 0x44
+#define EMC_W2P                                 0x48
+#define EMC_RD_RCD                              0x4c
+#define EMC_WR_RCD                              0x50
+#define EMC_RRD                                 0x54
+#define EMC_REXT                                0x58
+#define EMC_WDV                                 0x5c
+#define EMC_QUSE                                0x60
+#define EMC_QRST                                0x64
+#define EMC_QSAFE                               0x68
+#define EMC_RDV                                 0x6c
+#define EMC_REFRESH                             0x70
+#define EMC_BURST_REFRESH_NUM                   0x74
+#define EMC_PDEX2WR                             0x78
+#define EMC_PDEX2RD                             0x7c
+#define EMC_PCHG2PDEN                           0x80
+#define EMC_ACT2PDEN                            0x84
+#define EMC_AR2PDEN                             0x88
+#define EMC_RW2PDEN                             0x8c
+#define EMC_TXSR                                0x90
+#define EMC_TCKE                                0x94
+#define EMC_TFAW                                0x98
+#define EMC_TRPAB                               0x9c
+#define EMC_TCLKSTABLE                          0xa0
+#define EMC_TCLKSTOP                            0xa4
+#define EMC_TREFBW                              0xa8
+#define EMC_ODT_WRITE                           0xb0
+#define EMC_ODT_READ                            0xb4
+#define EMC_WEXT                                0xb8
+#define EMC_CTT                                 0xbc
+#define EMC_RFC_SLR                             0xc0
+#define EMC_MRS_WAIT_CNT2                       0xc4
+
+#define EMC_MRS_WAIT_CNT                        0xc8
+#define EMC_MRS_WAIT_CNT_SHORT_WAIT_SHIFT       0
+#define EMC_MRS_WAIT_CNT_SHORT_WAIT_MASK        \
+        (0x3FF << EMC_MRS_WAIT_CNT_SHORT_WAIT_SHIFT)
+#define EMC_MRS_WAIT_CNT_LONG_WAIT_SHIFT        16
+#define EMC_MRS_WAIT_CNT_LONG_WAIT_MASK         \
+        (0x3FF << EMC_MRS_WAIT_CNT_LONG_WAIT_SHIFT)
+
+#define EMC_MRS                                 0xcc
+#define EMC_MODE_SET_DLL_RESET                  BIT(8)
+#define EMC_MODE_SET_LONG_CNT                   BIT(26)
+#define EMC_EMRS                                0xd0
+#define EMC_REF                                 0xd4
+#define EMC_PRE                                 0xd8
+
+#define EMC_SELF_REF                            0xe0
+#define EMC_SELF_REF_CMD_ENABLED                BIT(0)
+#define EMC_SELF_REF_DEV_SEL_SHIFT              30
+
+#define EMC_MRW                                 0xe8
+
+#define EMC_MRR                                 0xec
+#define EMC_MRR_MA_SHIFT                        16
+#define LPDDR2_MR4_TEMP_SHIFT                   0
+
+#define EMC_XM2DQSPADCTRL3                      0xf8
+#define EMC_FBIO_SPARE                          0x100
+
+#define EMC_FBIO_CFG6                           0x114
+#define EMC_EMRS2                               0x12c
+#define EMC_MRW2                                0x134
+#define EMC_MRW4                                0x13c
+#define EMC_EINPUT                              0x14c
+#define EMC_EINPUT_DURATION                     0x150
+#define EMC_PUTERM_EXTRA                        0x154
+#define EMC_TCKESR                              0x158
+#define EMC_TPD                                 0x15c
+
+#define EMC_AUTO_CAL_CONFIG                     0x2a4
+#define EMC_AUTO_CAL_CONFIG_AUTO_CAL_START      BIT(31)
+#define EMC_AUTO_CAL_INTERVAL                   0x2a8
+#define EMC_AUTO_CAL_STATUS                     0x2ac
+#define EMC_AUTO_CAL_STATUS_ACTIVE              BIT(31)
+#define EMC_STATUS                              0x2b4
+#define EMC_STATUS_TIMING_UPDATE_STALLED        BIT(23)
+
+#define EMC_CFG_2                               0x2b8
+#define EMC_CFG_2_MODE_SHIFT                    0
+#define EMC_CFG_2_DIS_STP_OB_CLK_DURING_NON_WR  BIT(6)
+
+#define EMC_CFG_DIG_DLL                         0x2bc
+#define EMC_CFG_DIG_DLL_PERIOD                  0x2c0
+#define EMC_RDV_MASK                            0x2cc
+#define EMC_WDV_MASK                            0x2d0
+#define EMC_CTT_DURATION                        0x2d8
+#define EMC_CTT_TERM_CTRL                       0x2dc
+#define EMC_ZCAL_INTERVAL                       0x2e0
+#define EMC_ZCAL_WAIT_CNT                       0x2e4
+
+#define EMC_ZQ_CAL                              0x2ec
+#define EMC_ZQ_CAL_CMD                          BIT(0)
+#define EMC_ZQ_CAL_LONG                         BIT(4)
+#define EMC_ZQ_CAL_LONG_CMD_DEV0                \
+        (DRAM_DEV_SEL_0 | EMC_ZQ_CAL_LONG | EMC_ZQ_CAL_CMD)
+#define EMC_ZQ_CAL_LONG_CMD_DEV1                \
+        (DRAM_DEV_SEL_1 | EMC_ZQ_CAL_LONG | EMC_ZQ_CAL_CMD)
+
+#define EMC_XM2CMDPADCTRL                       0x2f0
+#define EMC_XM2DQSPADCTRL                       0x2f8
+#define EMC_XM2DQSPADCTRL2                      0x2fc
+#define EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE     BIT(0)
+#define EMC_XM2DQSPADCTRL2_VREF_ENABLE          BIT(5)
+#define EMC_XM2DQPADCTRL                        0x300
+#define EMC_XM2DQPADCTRL2                       0x304
+#define EMC_XM2CLKPADCTRL                       0x308
+#define EMC_XM2COMPPADCTRL                      0x30c
+#define EMC_XM2VTTGENPADCTRL                    0x310
+#define EMC_XM2VTTGENPADCTRL2                   0x314
+#define EMC_XM2VTTGENPADCTRL3                   0x318
+#define EMC_XM2DQSPADCTRL4                      0x320
+#define EMC_DLL_XFORM_DQS0                      0x328
+#define EMC_DLL_XFORM_DQS1                      0x32c
+#define EMC_DLL_XFORM_DQS2                      0x330
+#define EMC_DLL_XFORM_DQS3                      0x334
+#define EMC_DLL_XFORM_DQS4                      0x338
+#define EMC_DLL_XFORM_DQS5                      0x33c
+#define EMC_DLL_XFORM_DQS6                      0x340
+#define EMC_DLL_XFORM_DQS7                      0x344
+#define EMC_DLL_XFORM_QUSE0                     0x348
+#define EMC_DLL_XFORM_QUSE1                     0x34c
+#define EMC_DLL_XFORM_QUSE2                     0x350
+#define EMC_DLL_XFORM_QUSE3                     0x354
+#define EMC_DLL_XFORM_QUSE4                     0x358
+#define EMC_DLL_XFORM_QUSE5                     0x35c
+#define EMC_DLL_XFORM_QUSE6                     0x360
+#define EMC_DLL_XFORM_QUSE7                     0x364
+#define EMC_DLL_XFORM_DQ0                       0x368
+#define EMC_DLL_XFORM_DQ1                       0x36c
+#define EMC_DLL_XFORM_DQ2                       0x370
+#define EMC_DLL_XFORM_DQ3                       0x374
+#define EMC_DLI_TRIM_TXDQS0                     0x3a8
+#define EMC_DLI_TRIM_TXDQS1                     0x3ac
+#define EMC_DLI_TRIM_TXDQS2                     0x3b0
+#define EMC_DLI_TRIM_TXDQS3                     0x3b4
+#define EMC_DLI_TRIM_TXDQS4                     0x3b8
+#define EMC_DLI_TRIM_TXDQS5                     0x3bc
+#define EMC_DLI_TRIM_TXDQS6                     0x3c0
+#define EMC_DLI_TRIM_TXDQS7                     0x3c4
+#define EMC_STALL_THEN_EXE_AFTER_CLKCHANGE      0x3cc
+#define EMC_SEL_DPD_CTRL                        0x3d8
+#define EMC_SEL_DPD_CTRL_DATA_SEL_DPD           BIT(8)
+#define EMC_SEL_DPD_CTRL_ODT_SEL_DPD            BIT(5)
+#define EMC_SEL_DPD_CTRL_RESET_SEL_DPD          BIT(4)
+#define EMC_SEL_DPD_CTRL_CA_SEL_DPD             BIT(3)
+#define EMC_SEL_DPD_CTRL_CLK_SEL_DPD            BIT(2)
+#define EMC_SEL_DPD_CTRL_DDR3_MASK      \
+        ((0xf << 2) | BIT(8))
+#define EMC_SEL_DPD_CTRL_MASK \
+        ((0x3 << 2) | BIT(5) | BIT(8))
+#define EMC_PRE_REFRESH_REQ_CNT                 0x3dc
+#define EMC_DYN_SELF_REF_CONTROL                0x3e0
+#define EMC_TXSRDLL                             0x3e4
+#define EMC_CCFIFO_ADDR                         0x3e8
+#define EMC_CCFIFO_DATA                         0x3ec
+#define EMC_CCFIFO_STATUS                       0x3f0
+#define EMC_CDB_CNTL_1                          0x3f4
+#define EMC_CDB_CNTL_2                          0x3f8
+#define EMC_XM2CLKPADCTRL2                      0x3fc
+#define EMC_AUTO_CAL_CONFIG2                    0x458
+#define EMC_AUTO_CAL_CONFIG3                    0x45c
+#define EMC_IBDLY                               0x468
+#define EMC_DLL_XFORM_ADDR0                     0x46c
+#define EMC_DLL_XFORM_ADDR1                     0x470
+#define EMC_DLL_XFORM_ADDR2                     0x474
+#define EMC_DSR_VTTGEN_DRV                      0x47c
+#define EMC_TXDSRVTTGEN                         0x480
+#define EMC_XM2CMDPADCTRL4                      0x484
+#define EMC_XM2CMDPADCTRL5                      0x488
+#define EMC_DLL_XFORM_DQS8                      0x4a0
+#define EMC_DLL_XFORM_DQS9                      0x4a4
+#define EMC_DLL_XFORM_DQS10                     0x4a8
+#define EMC_DLL_XFORM_DQS11                     0x4ac
+#define EMC_DLL_XFORM_DQS12                     0x4b0
+#define EMC_DLL_XFORM_DQS13                     0x4b4
+#define EMC_DLL_XFORM_DQS14                     0x4b8
+#define EMC_DLL_XFORM_DQS15                     0x4bc
+#define EMC_DLL_XFORM_QUSE8                     0x4c0
+#define EMC_DLL_XFORM_QUSE9                     0x4c4
+#define EMC_DLL_XFORM_QUSE10                    0x4c8
+#define EMC_DLL_XFORM_QUSE11                    0x4cc
+#define EMC_DLL_XFORM_QUSE12                    0x4d0
+#define EMC_DLL_XFORM_QUSE13                    0x4d4
+#define EMC_DLL_XFORM_QUSE14                    0x4d8
+#define EMC_DLL_XFORM_QUSE15                    0x4dc
+#define EMC_DLL_XFORM_DQ4                       0x4e0
+#define EMC_DLL_XFORM_DQ5                       0x4e4
+#define EMC_DLL_XFORM_DQ6                       0x4e8
+#define EMC_DLL_XFORM_DQ7                       0x4ec
+#define EMC_DLI_TRIM_TXDQS8                     0x520
+#define EMC_DLI_TRIM_TXDQS9                     0x524
+#define EMC_DLI_TRIM_TXDQS10                    0x528
+#define EMC_DLI_TRIM_TXDQS11                    0x52c
+#define EMC_DLI_TRIM_TXDQS12                    0x530
+#define EMC_DLI_TRIM_TXDQS13                    0x534
+#define EMC_DLI_TRIM_TXDQS14                    0x538
+#define EMC_DLI_TRIM_TXDQS15                    0x53c
+#define EMC_CDB_CNTL_3                          0x540
+#define EMC_XM2DQSPADCTRL5                      0x544
+#define EMC_XM2DQSPADCTRL6                      0x548
+#define EMC_XM2DQPADCTRL3                       0x54c
+#define EMC_DLL_XFORM_ADDR3                     0x550
+#define EMC_DLL_XFORM_ADDR4                     0x554
+#define EMC_DLL_XFORM_ADDR5                     0x558
+#define EMC_CFG_PIPE                            0x560
+#define EMC_QPOP                                0x564
+#define EMC_QUSE_WIDTH                          0x568
+#define EMC_PUTERM_WIDTH                        0x56c
+#define EMC_BGBIAS_CTL0                         0x570
+#define EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX BIT(3)
+#define EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_VTTGEN BIT(2)
+#define EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD        BIT(1)
+#define EMC_PUTERM_ADJ                          0x574
+
+#define DRAM_DEV_SEL_ALL                        0
+#define DRAM_DEV_SEL_0                          (2 << 30)
+#define DRAM_DEV_SEL_1                          (1 << 30)
+
+#define EMC_CFG_POWER_FEATURES_MASK             \
+        (EMC_CFG_DYN_SREF | EMC_CFG_DRAM_ACPD | EMC_CFG_DRAM_CLKSTOP_SR | \
+        EMC_CFG_DRAM_CLKSTOP_PD | EMC_CFG_DSR_VTTGEN_DRV_EN)
+#define EMC_REFCTRL_DEV_SEL(n) (((n > 1) ? 0 : 2) << EMC_REFCTRL_DEV_SEL_SHIFT)
+#define EMC_DRAM_DEV_SEL(n) ((n > 1) ? DRAM_DEV_SEL_ALL : DRAM_DEV_SEL_0)
+
+/* Maximum amount of time in us. to wait for changes to become effective */
+#define EMC_STATUS_UPDATE_TIMEOUT               1000
+
+enum emc_dram_type {
+        DRAM_TYPE_DDR3 = 0,
+        DRAM_TYPE_DDR1 = 1,
+        DRAM_TYPE_LPDDR3 = 2,
+        DRAM_TYPE_DDR2 = 3
+};
+
+enum emc_dll_change {
+        DLL_CHANGE_NONE,
+        DLL_CHANGE_ON,
+        DLL_CHANGE_OFF
+};
+
+static const unsigned long emc_burst_regs[] = {
+        EMC_RC,
+        EMC_RFC,
+        EMC_RFC_SLR,
+        EMC_RAS,
+        EMC_RP,
+        EMC_R2W,
+        EMC_W2R,
+        EMC_R2P,
+        EMC_W2P,
+        EMC_RD_RCD,
+        EMC_WR_RCD,
+        EMC_RRD,
+        EMC_REXT,
+        EMC_WEXT,
+        EMC_WDV,
+        EMC_WDV_MASK,
+        EMC_QUSE,
+        EMC_QUSE_WIDTH,
+        EMC_IBDLY,
+        EMC_EINPUT,
+        EMC_EINPUT_DURATION,
+        EMC_PUTERM_EXTRA,
+        EMC_PUTERM_WIDTH,
+        EMC_PUTERM_ADJ,
+        EMC_CDB_CNTL_1,
+        EMC_CDB_CNTL_2,
+        EMC_CDB_CNTL_3,
+        EMC_QRST,
+        EMC_QSAFE,
+        EMC_RDV,
+        EMC_RDV_MASK,
+        EMC_REFRESH,
+        EMC_BURST_REFRESH_NUM,
+        EMC_PRE_REFRESH_REQ_CNT,
+        EMC_PDEX2WR,
+        EMC_PDEX2RD,
+        EMC_PCHG2PDEN,
+        EMC_ACT2PDEN,
+        EMC_AR2PDEN,
+        EMC_RW2PDEN,
+        EMC_TXSR,
+        EMC_TXSRDLL,
+        EMC_TCKE,
+        EMC_TCKESR,
+        EMC_TPD,
+        EMC_TFAW,
+        EMC_TRPAB,
+        EMC_TCLKSTABLE,
+        EMC_TCLKSTOP,
+        EMC_TREFBW,
+        EMC_FBIO_CFG6,
+        EMC_ODT_WRITE,
+        EMC_ODT_READ,
+        EMC_FBIO_CFG5,
+        EMC_CFG_DIG_DLL,
+        EMC_CFG_DIG_DLL_PERIOD,
+        EMC_DLL_XFORM_DQS0,
+        EMC_DLL_XFORM_DQS1,
+        EMC_DLL_XFORM_DQS2,
+        EMC_DLL_XFORM_DQS3,
+        EMC_DLL_XFORM_DQS4,
+        EMC_DLL_XFORM_DQS5,
+        EMC_DLL_XFORM_DQS6,
+        EMC_DLL_XFORM_DQS7,
+        EMC_DLL_XFORM_DQS8,
+        EMC_DLL_XFORM_DQS9,
+        EMC_DLL_XFORM_DQS10,
+        EMC_DLL_XFORM_DQS11,
+        EMC_DLL_XFORM_DQS12,
+        EMC_DLL_XFORM_DQS13,
+        EMC_DLL_XFORM_DQS14,
+        EMC_DLL_XFORM_DQS15,
+        EMC_DLL_XFORM_QUSE0,
+        EMC_DLL_XFORM_QUSE1,
+        EMC_DLL_XFORM_QUSE2,
+        EMC_DLL_XFORM_QUSE3,
+        EMC_DLL_XFORM_QUSE4,
+        EMC_DLL_XFORM_QUSE5,
+        EMC_DLL_XFORM_QUSE6,
+        EMC_DLL_XFORM_QUSE7,
+        EMC_DLL_XFORM_ADDR0,
+        EMC_DLL_XFORM_ADDR1,
+        EMC_DLL_XFORM_ADDR2,
+        EMC_DLL_XFORM_ADDR3,
+        EMC_DLL_XFORM_ADDR4,
+        EMC_DLL_XFORM_ADDR5,
+        EMC_DLL_XFORM_QUSE8,
+        EMC_DLL_XFORM_QUSE9,
+        EMC_DLL_XFORM_QUSE10,
+        EMC_DLL_XFORM_QUSE11,
+        EMC_DLL_XFORM_QUSE12,
+        EMC_DLL_XFORM_QUSE13,
+        EMC_DLL_XFORM_QUSE14,
+        EMC_DLL_XFORM_QUSE15,
+        EMC_DLI_TRIM_TXDQS0,
+        EMC_DLI_TRIM_TXDQS1,
+        EMC_DLI_TRIM_TXDQS2,
+        EMC_DLI_TRIM_TXDQS3,
+        EMC_DLI_TRIM_TXDQS4,
+        EMC_DLI_TRIM_TXDQS5,
+        EMC_DLI_TRIM_TXDQS6,
+        EMC_DLI_TRIM_TXDQS7,
+        EMC_DLI_TRIM_TXDQS8,
+        EMC_DLI_TRIM_TXDQS9,
+        EMC_DLI_TRIM_TXDQS10,
+        EMC_DLI_TRIM_TXDQS11,
+        EMC_DLI_TRIM_TXDQS12,
+        EMC_DLI_TRIM_TXDQS13,
+        EMC_DLI_TRIM_TXDQS14,
+        EMC_DLI_TRIM_TXDQS15,
+        EMC_DLL_XFORM_DQ0,
+        EMC_DLL_XFORM_DQ1,
+        EMC_DLL_XFORM_DQ2,
+        EMC_DLL_XFORM_DQ3,
+        EMC_DLL_XFORM_DQ4,
+        EMC_DLL_XFORM_DQ5,
+        EMC_DLL_XFORM_DQ6,
+        EMC_DLL_XFORM_DQ7,
+        EMC_XM2CMDPADCTRL,
+        EMC_XM2CMDPADCTRL4,
+        EMC_XM2CMDPADCTRL5,
+        EMC_XM2DQPADCTRL2,
+        EMC_XM2DQPADCTRL3,
+        EMC_XM2CLKPADCTRL,
+        EMC_XM2CLKPADCTRL2,
+        EMC_XM2COMPPADCTRL,
+        EMC_XM2VTTGENPADCTRL,
+        EMC_XM2VTTGENPADCTRL2,
+        EMC_XM2VTTGENPADCTRL3,
+        EMC_XM2DQSPADCTRL3,
+        EMC_XM2DQSPADCTRL4,
+        EMC_XM2DQSPADCTRL5,
+        EMC_XM2DQSPADCTRL6,
+        EMC_DSR_VTTGEN_DRV,
+        EMC_TXDSRVTTGEN,
+        EMC_FBIO_SPARE,
+        EMC_ZCAL_WAIT_CNT,
+        EMC_MRS_WAIT_CNT2,
+        EMC_CTT,
+        EMC_CTT_DURATION,
+        EMC_CFG_PIPE,
+        EMC_DYN_SELF_REF_CONTROL,
+        EMC_QPOP
+};
+
+struct emc_timing {
+        unsigned long rate;
+
+        u32 emc_burst_data[ARRAY_SIZE(emc_burst_regs)];
+
+        u32 emc_auto_cal_config;
+        u32 emc_auto_cal_config2;
+        u32 emc_auto_cal_config3;
+        u32 emc_auto_cal_interval;
+        u32 emc_bgbias_ctl0;
+        u32 emc_cfg;
+        u32 emc_cfg_2;
+        u32 emc_ctt_term_ctrl;
+        u32 emc_mode_1;
+        u32 emc_mode_2;
+        u32 emc_mode_4;
+        u32 emc_mode_reset;
+        u32 emc_mrs_wait_cnt;
+        u32 emc_sel_dpd_ctrl;
+        u32 emc_xm2dqspadctrl2;
+        u32 emc_zcal_cnt_long;
+        u32 emc_zcal_interval;
+};
+
+struct tegra_emc {
+        struct device *dev;
+
+        struct tegra_mc *mc;
+
+        void __iomem *regs;
+
+        enum emc_dram_type dram_type;
+        unsigned int dram_num;
+
+        struct emc_timing last_timing;
+        struct emc_timing *timings;
+        unsigned int num_timings;
+};
+
+/* Timing change sequence functions */
+
+static void emc_ccfifo_writel(struct tegra_emc *emc, u32 value,
+                              unsigned long offset)
+{
+        writel(value, emc->regs + EMC_CCFIFO_DATA);
+        writel(offset, emc->regs + EMC_CCFIFO_ADDR);
+}
+
+static void emc_seq_update_timing(struct tegra_emc *emc)
+{
+        unsigned int i;
+        u32 value;
+
+        writel(1, emc->regs + EMC_TIMING_CONTROL);
+
+        for (i = 0; i < EMC_STATUS_UPDATE_TIMEOUT; ++i) {
+                value = readl(emc->regs + EMC_STATUS);
+                if ((value & EMC_STATUS_TIMING_UPDATE_STALLED) == 0)
+                        return;
+                udelay(1);
+        }
+
+        dev_err(emc->dev, "timing update timed out\n");
+}
+
+static void emc_seq_disable_auto_cal(struct tegra_emc *emc)
+{
+        unsigned int i;
+        u32 value;
+
+        writel(0, emc->regs + EMC_AUTO_CAL_INTERVAL);
+
+        for (i = 0; i < EMC_STATUS_UPDATE_TIMEOUT; ++i) {
+                value = readl(emc->regs + EMC_AUTO_CAL_STATUS);
+                if ((value & EMC_AUTO_CAL_STATUS_ACTIVE) == 0)
+                        return;
+                udelay(1);
+        }
+
+        dev_err(emc->dev, "auto cal disable timed out\n");
+}
+
+static void emc_seq_wait_clkchange(struct tegra_emc *emc)
+{
+        unsigned int i;
+        u32 value;
+
+        for (i = 0; i < EMC_STATUS_UPDATE_TIMEOUT; ++i) {
+                value = readl(emc->regs + EMC_INTSTATUS);
+                if (value & EMC_INTSTATUS_CLKCHANGE_COMPLETE)
+                        return;
+                udelay(1);
+        }
+
+        dev_err(emc->dev, "clock change timed out\n");
+}
+
+static struct emc_timing *tegra_emc_find_timing(struct tegra_emc *emc,
+                                                unsigned long rate)
+{
+        struct emc_timing *timing = NULL;
+        unsigned int i;
+
+        for (i = 0; i < emc->num_timings; i++) {
+                if (emc->timings[i].rate == rate) {
+                        timing = &emc->timings[i];
+                        break;
+                }
+        }
+
+        if (!timing) {
+                dev_err(emc->dev, "no timing for rate %lu\n", rate);
+                return NULL;
+        }
+
+        return timing;
+}
+
+int tegra_emc_prepare_timing_change(struct tegra_emc *emc,
+                                    unsigned long rate)
+{
+        struct emc_timing *timing = tegra_emc_find_timing(emc, rate);
+        struct emc_timing *last = &emc->last_timing;
+        enum emc_dll_change dll_change;
+        unsigned int pre_wait = 0;
+        u32 val, val2, mask;
+        bool update = false;
+        unsigned int i;
+
+        if (!timing)
+                return -ENOENT;
+
+        if ((last->emc_mode_1 & 0x1) == (timing->emc_mode_1 & 0x1))
+                dll_change = DLL_CHANGE_NONE;
+        else if (timing->emc_mode_1 & 0x1)
+                dll_change = DLL_CHANGE_ON;
+        else
+                dll_change = DLL_CHANGE_OFF;
+
+        /* Clear CLKCHANGE_COMPLETE interrupts */
+        writel(EMC_INTSTATUS_CLKCHANGE_COMPLETE, emc->regs + EMC_INTSTATUS);
+
+        /* Disable dynamic self-refresh */
+        val = readl(emc->regs + EMC_CFG);
+        if (val & EMC_CFG_PWR_MASK) {
+                val &= ~EMC_CFG_POWER_FEATURES_MASK;
+                writel(val, emc->regs + EMC_CFG);
+
+                pre_wait = 5;
+        }
+
+        /* Disable SEL_DPD_CTRL for clock change */
+        if (emc->dram_type == DRAM_TYPE_DDR3)
+                mask = EMC_SEL_DPD_CTRL_DDR3_MASK;
+        else
+                mask = EMC_SEL_DPD_CTRL_MASK;
+
+        val = readl(emc->regs + EMC_SEL_DPD_CTRL);
+        if (val & mask) {
+                val &= ~mask;
+                writel(val, emc->regs + EMC_SEL_DPD_CTRL);
+        }
+
+        /* Prepare DQ/DQS for clock change */
+        val = readl(emc->regs + EMC_BGBIAS_CTL0);
+        val2 = last->emc_bgbias_ctl0;
+        if (!(timing->emc_bgbias_ctl0 &
+              EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX) &&
+            (val & EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX)) {
+                val2 &= ~EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX;
+                update = true;
+        }
+
+        if ((val & EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD) ||
+            (val & EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_VTTGEN)) {
+                update = true;
+        }
+
+        if (update) {
+                writel(val2, emc->regs + EMC_BGBIAS_CTL0);
+                if (pre_wait < 5)
+                        pre_wait = 5;
+        }
+
+        update = false;
+        val = readl(emc->regs + EMC_XM2DQSPADCTRL2);
+        if (timing->emc_xm2dqspadctrl2 & EMC_XM2DQSPADCTRL2_VREF_ENABLE &&
+            !(val & EMC_XM2DQSPADCTRL2_VREF_ENABLE)) {
+                val |= EMC_XM2DQSPADCTRL2_VREF_ENABLE;
+                update = true;
+        }
+
+        if (timing->emc_xm2dqspadctrl2 & EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE &&
+            !(val & EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE)) {
+                val |= EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE;
+                update = true;
+        }
+
+        if (update) {
+                writel(val, emc->regs + EMC_XM2DQSPADCTRL2);
+                if (pre_wait < 30)
+                        pre_wait = 30;
+        }
+
+        /* Wait to settle */
+        if (pre_wait) {
+                emc_seq_update_timing(emc);
+                udelay(pre_wait);
+        }
+
+        /* Program CTT_TERM control */
+        if (last->emc_ctt_term_ctrl != timing->emc_ctt_term_ctrl) {
+                emc_seq_disable_auto_cal(emc);
+                writel(timing->emc_ctt_term_ctrl,
+                       emc->regs + EMC_CTT_TERM_CTRL);
+                emc_seq_update_timing(emc);
+        }
+
+        /* Program burst shadow registers */
+        for (i = 0; i < ARRAY_SIZE(timing->emc_burst_data); ++i)
+                writel(timing->emc_burst_data[i],
+                       emc->regs + emc_burst_regs[i]);
+
+        writel(timing->emc_xm2dqspadctrl2, emc->regs + EMC_XM2DQSPADCTRL2);
+        writel(timing->emc_zcal_interval, emc->regs + EMC_ZCAL_INTERVAL);
+
+        tegra_mc_write_emem_configuration(emc->mc, timing->rate);
+
+        val = timing->emc_cfg & ~EMC_CFG_POWER_FEATURES_MASK;
+        emc_ccfifo_writel(emc, val, EMC_CFG);
+
+        /* Program AUTO_CAL_CONFIG */
+        if (timing->emc_auto_cal_config2 != last->emc_auto_cal_config2)
+                emc_ccfifo_writel(emc, timing->emc_auto_cal_config2,
+                                  EMC_AUTO_CAL_CONFIG2);
+
+        if (timing->emc_auto_cal_config3 != last->emc_auto_cal_config3)
+                emc_ccfifo_writel(emc, timing->emc_auto_cal_config3,
+                                  EMC_AUTO_CAL_CONFIG3);
+
+        if (timing->emc_auto_cal_config != last->emc_auto_cal_config) {
+                val = timing->emc_auto_cal_config;
+                val &= EMC_AUTO_CAL_CONFIG_AUTO_CAL_START;
+                emc_ccfifo_writel(emc, val, EMC_AUTO_CAL_CONFIG);
+        }
+
+        /* DDR3: predict MRS long wait count */
+        if (emc->dram_type == DRAM_TYPE_DDR3 &&
+            dll_change == DLL_CHANGE_ON) {
+                u32 cnt = 512;
+
+                if (timing->emc_zcal_interval != 0 &&
+                    last->emc_zcal_interval == 0)
+                        cnt -= emc->dram_num * 256;
+
+                val = (timing->emc_mrs_wait_cnt
+                        & EMC_MRS_WAIT_CNT_SHORT_WAIT_MASK)
+                        >> EMC_MRS_WAIT_CNT_SHORT_WAIT_SHIFT;
+                if (cnt < val)
+                        cnt = val;
+
+                val = timing->emc_mrs_wait_cnt
+                        & ~EMC_MRS_WAIT_CNT_LONG_WAIT_MASK;
+                val |= (cnt << EMC_MRS_WAIT_CNT_LONG_WAIT_SHIFT)
+                        & EMC_MRS_WAIT_CNT_LONG_WAIT_MASK;
+
+                writel(val, emc->regs + EMC_MRS_WAIT_CNT);
+        }
+
+        val = timing->emc_cfg_2;
+        val &= ~EMC_CFG_2_DIS_STP_OB_CLK_DURING_NON_WR;
+        emc_ccfifo_writel(emc, val, EMC_CFG_2);
+
+        /* DDR3: Turn off DLL and enter self-refresh */
+        if (emc->dram_type == DRAM_TYPE_DDR3 && dll_change == DLL_CHANGE_OFF)
+                emc_ccfifo_writel(emc, timing->emc_mode_1, EMC_EMRS);
+
+        /* Disable refresh controller */
+        emc_ccfifo_writel(emc, EMC_REFCTRL_DEV_SEL(emc->dram_num),
+                          EMC_REFCTRL);
+        if (emc->dram_type == DRAM_TYPE_DDR3)
+                emc_ccfifo_writel(emc, EMC_DRAM_DEV_SEL(emc->dram_num) |
+                                       EMC_SELF_REF_CMD_ENABLED,
+                                  EMC_SELF_REF);
+
+        /* Flow control marker */
+        emc_ccfifo_writel(emc, 1, EMC_STALL_THEN_EXE_AFTER_CLKCHANGE);
+
+        /* DDR3: Exit self-refresh */
+        if (emc->dram_type == DRAM_TYPE_DDR3)
+                emc_ccfifo_writel(emc, EMC_DRAM_DEV_SEL(emc->dram_num),
+                                  EMC_SELF_REF);
+        emc_ccfifo_writel(emc, EMC_REFCTRL_DEV_SEL(emc->dram_num) |
+                               EMC_REFCTRL_ENABLE,
+                          EMC_REFCTRL);
+
+        /* Set DRAM mode registers */
+        if (emc->dram_type == DRAM_TYPE_DDR3) {
+                if (timing->emc_mode_1 != last->emc_mode_1)
+                        emc_ccfifo_writel(emc, timing->emc_mode_1, EMC_EMRS);
+                if (timing->emc_mode_2 != last->emc_mode_2)
+                        emc_ccfifo_writel(emc, timing->emc_mode_2, EMC_EMRS2);
+
+                if ((timing->emc_mode_reset != last->emc_mode_reset) ||
+                    dll_change == DLL_CHANGE_ON) {
+                        val = timing->emc_mode_reset;
+                        if (dll_change == DLL_CHANGE_ON) {
+                                val |= EMC_MODE_SET_DLL_RESET;
+                                val |= EMC_MODE_SET_LONG_CNT;
+                        } else {
+                                val &= ~EMC_MODE_SET_DLL_RESET;
+                        }
+                        emc_ccfifo_writel(emc, val, EMC_MRS);
+                }
+        } else {
+                if (timing->emc_mode_2 != last->emc_mode_2)
+                        emc_ccfifo_writel(emc, timing->emc_mode_2, EMC_MRW2);
+                if (timing->emc_mode_1 != last->emc_mode_1)
+                        emc_ccfifo_writel(emc, timing->emc_mode_1, EMC_MRW);
+                if (timing->emc_mode_4 != last->emc_mode_4)
+                        emc_ccfifo_writel(emc, timing->emc_mode_4, EMC_MRW4);
+        }
+
+        /*  Issue ZCAL command if turning ZCAL on */
+        if (timing->emc_zcal_interval != 0 && last->emc_zcal_interval == 0) {
+                emc_ccfifo_writel(emc, EMC_ZQ_CAL_LONG_CMD_DEV0, EMC_ZQ_CAL);
+                if (emc->dram_num > 1)
+                        emc_ccfifo_writel(emc, EMC_ZQ_CAL_LONG_CMD_DEV1,
+                                          EMC_ZQ_CAL);
+        }
+
+        /*  Write to RO register to remove stall after change */
+        emc_ccfifo_writel(emc, 0, EMC_CCFIFO_STATUS);
+
+        if (timing->emc_cfg_2 & EMC_CFG_2_DIS_STP_OB_CLK_DURING_NON_WR)
+                emc_ccfifo_writel(emc, timing->emc_cfg_2, EMC_CFG_2);
+
+        /* Disable AUTO_CAL for clock change */
+        emc_seq_disable_auto_cal(emc);
+
+        /* Read register to wait until programming has settled */
+        readl(emc->regs + EMC_INTSTATUS);
+
+        return 0;
+}
+
+void tegra_emc_complete_timing_change(struct tegra_emc *emc,
+                                      unsigned long rate)
+{
+        struct emc_timing *timing = tegra_emc_find_timing(emc, rate);
+        struct emc_timing *last = &emc->last_timing;
+        u32 val;
+
+        if (!timing)
+                return;
+
+        /* Wait until the state machine has settled */
+        emc_seq_wait_clkchange(emc);
+
+        /* Restore AUTO_CAL */
+        if (timing->emc_ctt_term_ctrl != last->emc_ctt_term_ctrl)
+                writel(timing->emc_auto_cal_interval,
+                       emc->regs + EMC_AUTO_CAL_INTERVAL);
+
+        /* Restore dynamic self-refresh */
+        if (timing->emc_cfg & EMC_CFG_PWR_MASK)
+                writel(timing->emc_cfg, emc->regs + EMC_CFG);
+
+        /* Set ZCAL wait count */
+        writel(timing->emc_zcal_cnt_long, emc->regs + EMC_ZCAL_WAIT_CNT);
+
+        /* LPDDR3: Turn off BGBIAS if low frequency */
+        if (emc->dram_type == DRAM_TYPE_LPDDR3 &&
+            timing->emc_bgbias_ctl0 &
+              EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX) {
+                val = timing->emc_bgbias_ctl0;
+                val |= EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_VTTGEN;
+                val |= EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD;
+                writel(val, emc->regs + EMC_BGBIAS_CTL0);
+        } else {
+                if (emc->dram_type == DRAM_TYPE_DDR3 &&
+                    readl(emc->regs + EMC_BGBIAS_CTL0) !=
+                      timing->emc_bgbias_ctl0) {
+                        writel(timing->emc_bgbias_ctl0,
+                               emc->regs + EMC_BGBIAS_CTL0);
+                }
+
+                writel(timing->emc_auto_cal_interval,
+                       emc->regs + EMC_AUTO_CAL_INTERVAL);
+        }
+
+        /* Wait for timing to settle */
+        udelay(2);
+
+        /* Reprogram SEL_DPD_CTRL */
+        writel(timing->emc_sel_dpd_ctrl, emc->regs + EMC_SEL_DPD_CTRL);
+        emc_seq_update_timing(emc);
+
+        emc->last_timing = *timing;
+}
+
+/* Initialization and deinitialization */
+
+static void emc_read_current_timing(struct tegra_emc *emc,
+                                    struct emc_timing *timing)
+{
+        unsigned int i;
+
+        for (i = 0; i < ARRAY_SIZE(emc_burst_regs); ++i)
+                timing->emc_burst_data[i] =
+                        readl(emc->regs + emc_burst_regs[i]);
+
+        timing->emc_cfg = readl(emc->regs + EMC_CFG);
+
+        timing->emc_auto_cal_interval = 0;
+        timing->emc_zcal_cnt_long = 0;
+        timing->emc_mode_1 = 0;
+        timing->emc_mode_2 = 0;
+        timing->emc_mode_4 = 0;
+        timing->emc_mode_reset = 0;
+}
+
+static int emc_init(struct tegra_emc *emc)
+{
+        emc->dram_type = readl(emc->regs + EMC_FBIO_CFG5);
+        emc->dram_type &= EMC_FBIO_CFG5_DRAM_TYPE_MASK;
+        emc->dram_type >>= EMC_FBIO_CFG5_DRAM_TYPE_SHIFT;
+
+        emc->dram_num = tegra_mc_get_emem_device_count(emc->mc);
+
+        emc_read_current_timing(emc, &emc->last_timing);
+
+        return 0;
+}
+
+static int load_one_timing_from_dt(struct tegra_emc *emc,
+                                   struct emc_timing *timing,
+                                   struct device_node *node)
+{
+        u32 value;
+        int err;
+
+        err = of_property_read_u32(node, "clock-frequency", &value);
+        if (err) {
+                dev_err(emc->dev, "timing %s: failed to read rate: %d\n",
+                        node->name, err);
+                return err;
+        }
+
+        timing->rate = value;
+
+        err = of_property_read_u32_array(node, "nvidia,emc-configuration",
+                                         timing->emc_burst_data,
+                                         ARRAY_SIZE(timing->emc_burst_data));
+        if (err) {
+                dev_err(emc->dev,
+                        "timing %s: failed to read emc burst data: %d\n",
+                        node->name, err);
+                return err;
+        }
+
+#define EMC_READ_PROP(prop, dtprop) { \
+        err = of_property_read_u32(node, dtprop, &timing->prop); \
+        if (err) { \
+                dev_err(emc->dev, "timing %s: failed to read " #prop ": %d\n", \
+                        node->name, err); \
+                return err; \
+        } \
+}
+
+        EMC_READ_PROP(emc_auto_cal_config, "nvidia,emc-auto-cal-config")
+        EMC_READ_PROP(emc_auto_cal_config2, "nvidia,emc-auto-cal-config2")
+        EMC_READ_PROP(emc_auto_cal_config3, "nvidia,emc-auto-cal-config3")
+        EMC_READ_PROP(emc_auto_cal_interval, "nvidia,emc-auto-cal-interval")
+        EMC_READ_PROP(emc_bgbias_ctl0, "nvidia,emc-bgbias-ctl0")
+        EMC_READ_PROP(emc_cfg, "nvidia,emc-cfg")
+        EMC_READ_PROP(emc_cfg_2, "nvidia,emc-cfg-2")
+        EMC_READ_PROP(emc_ctt_term_ctrl, "nvidia,emc-ctt-term-ctrl")
+        EMC_READ_PROP(emc_mode_1, "nvidia,emc-mode-1")
+        EMC_READ_PROP(emc_mode_2, "nvidia,emc-mode-2")
+        EMC_READ_PROP(emc_mode_4, "nvidia,emc-mode-4")
+        EMC_READ_PROP(emc_mode_reset, "nvidia,emc-mode-reset")
+        EMC_READ_PROP(emc_mrs_wait_cnt, "nvidia,emc-mrs-wait-cnt")
+        EMC_READ_PROP(emc_sel_dpd_ctrl, "nvidia,emc-sel-dpd-ctrl")
+        EMC_READ_PROP(emc_xm2dqspadctrl2, "nvidia,emc-xm2dqspadctrl2")
+        EMC_READ_PROP(emc_zcal_cnt_long, "nvidia,emc-zcal-cnt-long")
+        EMC_READ_PROP(emc_zcal_interval, "nvidia,emc-zcal-interval")
+
+#undef EMC_READ_PROP
+
+        return 0;
+}
+
+static int cmp_timings(const void *_a, const void *_b)
+{
+        const struct emc_timing *a = _a;
+        const struct emc_timing *b = _b;
+
+        if (a->rate < b->rate)
+                return -1;
+        else if (a->rate == b->rate)
+                return 0;
+        else
+                return 1;
+}
+
+static int tegra_emc_load_timings_from_dt(struct tegra_emc *emc,
+                                          struct device_node *node)
+{
+        int child_count = of_get_child_count(node);
+        struct device_node *child;
+        struct emc_timing *timing;
+        unsigned int i = 0;
+        int err;
+
+        emc->timings = devm_kcalloc(emc->dev, child_count, sizeof(*timing),
+                                    GFP_KERNEL);
+        if (!emc->timings)
+                return -ENOMEM;
+
+        emc->num_timings = child_count;
+
+        for_each_child_of_node(node, child) {
+                timing = &emc->timings[i++];
+
+                err = load_one_timing_from_dt(emc, timing, child);
+                if (err)
+                        return err;
+        }
+
+        sort(emc->timings, emc->num_timings, sizeof(*timing), cmp_timings,
+             NULL);
+
+        return 0;
+}
+
+static const struct of_device_id tegra_emc_of_match[] = {
+        { .compatible = "nvidia,tegra124-emc" },
+        {}
+};
+
+static struct device_node *
+tegra_emc_find_node_by_ram_code(struct device_node *node, u32 ram_code)
+{
+        struct device_node *np;
+        int err;
+
+        for_each_child_of_node(node, np) {
+                u32 value;
+
+                err = of_property_read_u32(np, "nvidia,ram-code", &value);
+                if (err || (value != ram_code)) {
+                        of_node_put(np);
+                        continue;
+                }
+
+                return np;
+        }
+
+        return NULL;
+}
+
+static int tegra_emc_probe(struct platform_device *pdev)
+{
+        struct platform_device *mc;
+        struct device_node *np;
+        struct tegra_emc *emc;
+        struct resource *res;
+        u32 ram_code;
+        int err;
+
+        emc = devm_kzalloc(&pdev->dev, sizeof(*emc), GFP_KERNEL);
+        if (!emc)
+                return -ENOMEM;
+
+        emc->dev = &pdev->dev;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        emc->regs = devm_ioremap_resource(&pdev->dev, res);
+        if (IS_ERR(emc->regs))
+                return PTR_ERR(emc->regs);
+
+        np = of_parse_phandle(pdev->dev.of_node, "nvidia,memory-controller", 0);
+        if (!np) {
+                dev_err(&pdev->dev, "could not get memory controller\n");
+                return -ENOENT;
+        }
+
+        mc = of_find_device_by_node(np);
+        if (!mc)
+                return -ENOENT;
+
+        of_node_put(np);
+
+        emc->mc = platform_get_drvdata(mc);
+        if (!emc->mc)
+                return -EPROBE_DEFER;
+
+        ram_code = tegra_read_ram_code();
+
+        np = tegra_emc_find_node_by_ram_code(pdev->dev.of_node, ram_code);
+        if (!np) {
+                dev_err(&pdev->dev,
+                        "no memory timings for RAM code %u found in DT\n",
+                        ram_code);
+                return -ENOENT;
+        }
+
+        err = tegra_emc_load_timings_from_dt(emc, np);
+
+        of_node_put(np);
+
+        if (err)
+                return err;
+
+        if (emc->num_timings == 0) {
+                dev_err(&pdev->dev,
+                        "no memory timings for RAM code %u registered\n",
+                        ram_code);
+                return -ENOENT;
+        }
+
+        err = emc_init(emc);
+        if (err) {
+                dev_err(&pdev->dev, "EMC initialization failed: %d\n", err);
+                return err;
+        }
+
+        platform_set_drvdata(pdev, emc);
+
+        return 0;
+};
+
+static struct platform_driver tegra_emc_driver = {
+        .probe = tegra_emc_probe,
+        .driver = {
+                .name = "tegra-emc",
+                .of_match_table = tegra_emc_of_match,
+                .suppress_bind_attrs = true,
+        },
+};
+
+static int tegra_emc_init(void)
+{
+        return platform_driver_register(&tegra_emc_driver);
+}
+subsys_initcall(tegra_emc_init);