[PATCH 8/8] clk: tegra: Add EMC clock driver
From: Mikko Perttunen
Date: Fri Jul 11 2014 - 10:19:48 EST
The driver is currently only tested on Tegra124 Jetson TK1, but should
work with other Tegra124 boards, provided that correct EMC tables are
provided through the device tree. Older chip models have differing
timing change sequences, so they are not currently supported.
Signed-off-by: Mikko Perttunen <mperttunen@xxxxxxxxxx>
---
drivers/clk/tegra/Makefile | 2 +-
drivers/clk/tegra/clk-emc.c | 1508 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 1509 insertions(+), 1 deletion(-)
create mode 100644 drivers/clk/tegra/clk-emc.c
diff --git a/drivers/clk/tegra/Makefile b/drivers/clk/tegra/Makefile
index f7dfb72..240e5b4 100644
--- a/drivers/clk/tegra/Makefile
+++ b/drivers/clk/tegra/Makefile
@@ -14,4 +14,4 @@ obj-y += clk-tegra-super-gen4.o
obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += clk-tegra20.o
obj-$(CONFIG_ARCH_TEGRA_3x_SOC) += clk-tegra30.o
obj-$(CONFIG_ARCH_TEGRA_114_SOC) += clk-tegra114.o
-obj-$(CONFIG_ARCH_TEGRA_124_SOC) += clk-tegra124.o
+obj-$(CONFIG_ARCH_TEGRA_124_SOC) += clk-tegra124.o clk-emc.o
diff --git a/drivers/clk/tegra/clk-emc.c b/drivers/clk/tegra/clk-emc.c
new file mode 100644
index 0000000..008f9f3
--- /dev/null
+++ b/drivers/clk/tegra/clk-emc.c
@@ -0,0 +1,1508 @@
+/*
+ * drivers/clk/tegra/clk-emc.c
+ *
+ * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
+ *
+ * Author:
+ * Mikko Perttunen <mperttunen@xxxxxxxxxx>
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/clk.h>
+#include <linux/of_address.h>
+#include <linux/string.h>
+#include <linux/debugfs.h>
+#include <linux/clkdev.h>
+
+#define EMC_FBIO_CFG5 0x104
+#define EMC_FBIO_CFG5_DRAM_TYPE_MASK 0x3
+#define EMC_FBIO_CFG5_DRAM_TYPE_SHIFT 0
+
+#define MC_EMEM_ADR_CFG 0x54
+#define MC_EMEM_ADR_CFG_EMEM_NUMDEV BIT(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 MC_EMEM_ARB_CFG 0x90
+#define MC_EMEM_ARB_OUTSTANDING_REQ 0x94
+#define MC_EMEM_ARB_TIMING_RCD 0x98
+#define MC_EMEM_ARB_TIMING_RP 0x9c
+#define MC_EMEM_ARB_TIMING_RC 0xa0
+#define MC_EMEM_ARB_TIMING_RAS 0xa4
+#define MC_EMEM_ARB_TIMING_FAW 0xa8
+#define MC_EMEM_ARB_TIMING_RRD 0xac
+#define MC_EMEM_ARB_TIMING_RAP2PRE 0xb0
+#define MC_EMEM_ARB_TIMING_WAP2PRE 0xb4
+#define MC_EMEM_ARB_TIMING_R2R 0xb8
+#define MC_EMEM_ARB_TIMING_W2W 0xbc
+#define MC_EMEM_ARB_TIMING_R2W 0xc0
+#define MC_EMEM_ARB_TIMING_W2R 0xc4
+#define MC_EMEM_ARB_DA_TURNS 0xd0
+#define MC_EMEM_ARB_DA_COVERS 0xd4
+#define MC_EMEM_ARB_MISC0 0xd8
+#define MC_EMEM_ARB_MISC1 0xdc
+#define MC_EMEM_ARB_RING1_THROTTLE 0xe0
+
+#define MC_TIMING_CONTROL 0xfc
+
+#define DRAM_DEV_SEL_ALL 0
+#define DRAM_DEV_SEL_0 (2 << 30)
+#define DRAM_DEV_SEL_1 (1 << 30)
+
+#define CLK_SOURCE_EMC 0x19c
+#define CLK_SOURCE_EMC_EMC_2X_CLK_DIVISOR_SHIFT 0
+#define CLK_SOURCE_EMC_EMC_2X_CLK_DIVISOR_MASK 0xff
+#define CLK_SOURCE_EMC_EMC_2X_CLK_SRC_SHIFT 29
+#define CLK_SOURCE_EMC_EMC_2X_CLK_SRC_MASK 0x7
+
+#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)
+
+#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 int t124_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_XM2DQSPADCTRL2,
+ 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_INTERVAL,
+ EMC_ZCAL_WAIT_CNT,
+ EMC_MRS_WAIT_CNT,
+ EMC_MRS_WAIT_CNT2,
+ EMC_CTT,
+ EMC_CTT_DURATION,
+ EMC_CFG_PIPE,
+ EMC_DYN_SELF_REF_CONTROL,
+ EMC_QPOP
+};
+
+static int t124_mc_burst_regs[] = {
+ MC_EMEM_ARB_CFG,
+ MC_EMEM_ARB_OUTSTANDING_REQ,
+ MC_EMEM_ARB_TIMING_RCD,
+ MC_EMEM_ARB_TIMING_RP,
+ MC_EMEM_ARB_TIMING_RC,
+ MC_EMEM_ARB_TIMING_RAS,
+ MC_EMEM_ARB_TIMING_FAW,
+ MC_EMEM_ARB_TIMING_RRD,
+ MC_EMEM_ARB_TIMING_RAP2PRE,
+ MC_EMEM_ARB_TIMING_WAP2PRE,
+ MC_EMEM_ARB_TIMING_R2R,
+ MC_EMEM_ARB_TIMING_W2W,
+ MC_EMEM_ARB_TIMING_R2W,
+ MC_EMEM_ARB_TIMING_W2R,
+ MC_EMEM_ARB_DA_TURNS,
+ MC_EMEM_ARB_DA_COVERS,
+ MC_EMEM_ARB_MISC0,
+ MC_EMEM_ARB_MISC1,
+ MC_EMEM_ARB_RING1_THROTTLE
+};
+
+const char *emc_parent_clk_names[] = {
+ "pll_m", "pll_c", "pll_p", "clk_m", "pll_m_ud",
+ "pll_c2", "pll_c3", "pll_c_ud"
+};
+
+/* List of clock sources for various parents the EMC clock can have.
+ * When we change the timing to a timing with a parent that has the same
+ * clock source as the current parent, we must first change to a backup
+ * timing that has a different clock source.
+ */
+
+#define EMC_SRC_PLL_M 0
+#define EMC_SRC_PLL_C 1
+#define EMC_SRC_PLL_P 2
+#define EMC_SRC_CLK_M 3
+#define EMC_SRC_PLL_C2 4
+#define EMC_SRC_PLL_C3 5
+const char emc_parent_clk_sources[] = {
+ EMC_SRC_PLL_M, EMC_SRC_PLL_C, EMC_SRC_PLL_P, EMC_SRC_CLK_M,
+ EMC_SRC_PLL_M, EMC_SRC_PLL_C2, EMC_SRC_PLL_C3, EMC_SRC_PLL_C
+};
+
+struct emc_timing {
+ unsigned long rate, parent_rate;
+ u8 parent_index;
+ struct clk *parent;
+
+ /* Store EMC burst data in a union to minimize mistakes. This allows
+ * us to use the same burst data lists as used by the downstream and
+ * ChromeOS kernels. */
+ union {
+ u32 emc_burst_data[ARRAY_SIZE(t124_emc_burst_regs)];
+ struct {
+ u32 __pad0[121];
+ u32 emc_xm2dqspadctrl2;
+ u32 __pad1[15];
+ u32 emc_zcal_interval;
+ u32 __pad2[1];
+ u32 emc_mrs_wait_cnt;
+ };
+ };
+ u32 mc_burst_data[ARRAY_SIZE(t124_mc_burst_regs)];
+
+ u32 emc_zcal_cnt_long;
+ u32 emc_auto_cal_interval;
+ u32 emc_ctt_term_ctrl;
+ u32 emc_cfg;
+ u32 emc_cfg_2;
+ u32 emc_sel_dpd_ctrl;
+ u32 __emc_cfg_dig_dll;
+ u32 emc_bgbias_ctl0;
+ u32 emc_auto_cal_config2;
+ u32 emc_auto_cal_config3;
+ u32 emc_auto_cal_config;
+ u32 emc_mode_reset;
+ u32 emc_mode_1;
+ u32 emc_mode_2;
+ u32 emc_mode_4;
+};
+
+struct tegra_emc {
+ struct platform_device *pdev;
+
+ struct clk_hw hw;
+
+ void __iomem *emc_regs;
+ void __iomem *mc_regs;
+ void __iomem *clk_regs;
+
+ enum emc_dram_type dram_type;
+ int dram_num;
+
+ struct emc_timing last_timing;
+ struct emc_timing *timings;
+ unsigned int num_timings;
+
+ struct clk *prev_parent;
+
+ bool changing_timing;
+};
+
+/* * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Timing change sequence functions *
+ * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+static void emc_ccfifo_writel(struct tegra_emc *tegra, u32 val,
+ unsigned long offs)
+{
+ writel(val, tegra->emc_regs + EMC_CCFIFO_DATA);
+ writel(offs, tegra->emc_regs + EMC_CCFIFO_ADDR);
+}
+
+static void emc_seq_update_timing(struct tegra_emc *tegra)
+{
+ int i;
+
+ writel(1, tegra->emc_regs + EMC_TIMING_CONTROL);
+
+ for (i = 0; i < EMC_STATUS_UPDATE_TIMEOUT; ++i) {
+ if (!(readl(tegra->emc_regs + EMC_STATUS) &
+ EMC_STATUS_TIMING_UPDATE_STALLED))
+ return;
+ }
+
+ dev_err(&tegra->pdev->dev, "timing update failed\n");
+ BUG();
+}
+
+static void emc_seq_disable_auto_cal(struct tegra_emc *tegra)
+{
+ int i;
+
+ writel(0, tegra->emc_regs + EMC_AUTO_CAL_INTERVAL);
+
+ for (i = 0; i < EMC_STATUS_UPDATE_TIMEOUT; ++i) {
+ if (!(readl(tegra->emc_regs + EMC_AUTO_CAL_STATUS) &
+ EMC_AUTO_CAL_STATUS_ACTIVE))
+ return;
+ }
+
+ dev_err(&tegra->pdev->dev, "auto cal disable failed\n");
+ BUG();
+}
+
+static void emc_seq_wait_clkchange(struct tegra_emc *tegra)
+{
+ int i;
+
+ for (i = 0; i < EMC_STATUS_UPDATE_TIMEOUT; ++i) {
+ if (readl(tegra->emc_regs + EMC_INTSTATUS) &
+ EMC_INTSTATUS_CLKCHANGE_COMPLETE)
+ return;
+ }
+
+ dev_err(&tegra->pdev->dev, "clkchange failed\n");
+ BUG();
+}
+
+static void emc_change_timing(struct tegra_emc *tegra,
+ const struct emc_timing *timing,
+ u32 car_value)
+{
+ u32 val, val2;
+ bool update = false;
+ int pre_wait = 0;
+ int i;
+ enum emc_dll_change dll_change;
+
+ BUG_ON(timing->rate == tegra->last_timing.rate);
+ BUG_ON(ARRAY_SIZE(timing->emc_burst_data) !=
+ ARRAY_SIZE(t124_emc_burst_regs));
+ BUG_ON(ARRAY_SIZE(timing->mc_burst_data) !=
+ ARRAY_SIZE(t124_mc_burst_regs));
+
+ if ((tegra->last_timing.emc_mode_1 & 0x1) == (timing->emc_mode_1 & 1))
+ dll_change = DLL_CHANGE_NONE;
+ else if (timing->emc_mode_1 & 1)
+ dll_change = DLL_CHANGE_ON;
+ else
+ dll_change = DLL_CHANGE_OFF;
+
+ /* Clear CLKCHANGE_COMPLETE interrupts */
+
+ writel(EMC_INTSTATUS_CLKCHANGE_COMPLETE,
+ tegra->emc_regs + EMC_INTSTATUS);
+
+
+ /* Disable dynamic self-refresh */
+
+ val = readl(tegra->emc_regs + EMC_CFG);
+ if (val & EMC_CFG_PWR_MASK) {
+ val &= ~EMC_CFG_POWER_FEATURES_MASK;
+ writel(val, tegra->emc_regs + EMC_CFG);
+
+ pre_wait = 5;
+ }
+
+ /* Disable SEL_DPD_CTRL for clock change */
+
+ val = readl(tegra->emc_regs + EMC_SEL_DPD_CTRL);
+ if (val & (tegra->dram_type == DRAM_TYPE_DDR3 ?
+ EMC_SEL_DPD_CTRL_DDR3_MASK : EMC_SEL_DPD_CTRL_MASK)) {
+ val &= ~(EMC_SEL_DPD_CTRL_DATA_SEL_DPD |
+ EMC_SEL_DPD_CTRL_ODT_SEL_DPD |
+ EMC_SEL_DPD_CTRL_CA_SEL_DPD |
+ EMC_SEL_DPD_CTRL_CLK_SEL_DPD);
+ if (tegra->dram_type == DRAM_TYPE_DDR3)
+ val &= ~EMC_SEL_DPD_CTRL_RESET_SEL_DPD;
+ writel(val, tegra->emc_regs + EMC_SEL_DPD_CTRL);
+ }
+
+ /* Prepare DQ/DQS for clock change */
+
+ val = readl(tegra->emc_regs + EMC_BGBIAS_CTL0);
+ val2 = tegra->last_timing.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, tegra->emc_regs + EMC_BGBIAS_CTL0);
+ if (pre_wait < 5)
+ pre_wait = 5;
+ }
+
+ update = false;
+ val = readl(tegra->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, tegra->emc_regs + EMC_XM2DQSPADCTRL2);
+ if (pre_wait < 30)
+ pre_wait = 30;
+ }
+
+ /* Wait to settle */
+
+ if (pre_wait) {
+ emc_seq_update_timing(tegra);
+ udelay(pre_wait);
+ }
+
+ /* Program CTT_TERM control */
+
+ if (tegra->last_timing.emc_ctt_term_ctrl != timing->emc_ctt_term_ctrl) {
+ emc_seq_disable_auto_cal(tegra);
+ writel(timing->emc_ctt_term_ctrl,
+ tegra->emc_regs + EMC_CTT_TERM_CTRL);
+ emc_seq_update_timing(tegra);
+ }
+
+ /* Program burst shadow registers */
+
+ for (i = 0; i < ARRAY_SIZE(timing->emc_burst_data); ++i)
+ __raw_writel(timing->emc_burst_data[i],
+ tegra->emc_regs + t124_emc_burst_regs[i]);
+
+ /* The MC burst registers are shadowed so they must be written here */
+ for (i = 0; i < ARRAY_SIZE(timing->mc_burst_data); ++i)
+ __raw_writel(timing->mc_burst_data[i],
+ tegra->mc_regs + t124_mc_burst_regs[i]);
+
+ val = timing->emc_cfg & ~EMC_CFG_POWER_FEATURES_MASK;
+ emc_ccfifo_writel(tegra, val, EMC_CFG);
+
+ /* Program AUTO_CAL_CONFIG */
+
+ if (timing->emc_auto_cal_config2 !=
+ tegra->last_timing.emc_auto_cal_config2)
+ emc_ccfifo_writel(tegra, timing->emc_auto_cal_config2,
+ EMC_AUTO_CAL_CONFIG2);
+ if (timing->emc_auto_cal_config3 !=
+ tegra->last_timing.emc_auto_cal_config3)
+ emc_ccfifo_writel(tegra, timing->emc_auto_cal_config3,
+ EMC_AUTO_CAL_CONFIG3);
+ if (timing->emc_auto_cal_config !=
+ tegra->last_timing.emc_auto_cal_config) {
+ val = timing->emc_auto_cal_config;
+ val &= EMC_AUTO_CAL_CONFIG_AUTO_CAL_START;
+ emc_ccfifo_writel(tegra, val, EMC_AUTO_CAL_CONFIG);
+ }
+
+ /* DDR3: predict MRS long wait count */
+
+ if (tegra->dram_type == DRAM_TYPE_DDR3 && dll_change == DLL_CHANGE_ON) {
+ u32 cnt = 32;
+
+ if (timing->emc_zcal_interval != 0 &&
+ tegra->last_timing.emc_zcal_interval == 0)
+ cnt -= tegra->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, tegra->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(tegra, val, EMC_CFG_2);
+
+ /* DDR3: Turn off DLL and enter self-refresh */
+
+ if (tegra->dram_type == DRAM_TYPE_DDR3 && dll_change == DLL_CHANGE_OFF)
+ emc_ccfifo_writel(tegra, timing->emc_mode_1, EMC_EMRS);
+
+ /* Disable refresh controller */
+
+ emc_ccfifo_writel(tegra, EMC_REFCTRL_DEV_SEL(tegra->dram_num),
+ EMC_REFCTRL);
+ if (tegra->dram_type == DRAM_TYPE_DDR3)
+ emc_ccfifo_writel(tegra,
+ EMC_DRAM_DEV_SEL(tegra->dram_num)
+ | EMC_SELF_REF_CMD_ENABLED,
+ EMC_SELF_REF);
+
+ /* Flow control marker */
+
+ emc_ccfifo_writel(tegra, 1, EMC_STALL_THEN_EXE_AFTER_CLKCHANGE);
+
+ /* DDR3: Exit self-refresh */
+
+ if (tegra->dram_type == DRAM_TYPE_DDR3)
+ emc_ccfifo_writel(tegra,
+ EMC_DRAM_DEV_SEL(tegra->dram_num),
+ EMC_SELF_REF);
+ emc_ccfifo_writel(tegra,
+ EMC_REFCTRL_DEV_SEL(tegra->dram_num)
+ | EMC_REFCTRL_ENABLE,
+ EMC_REFCTRL);
+
+ /* Set DRAM mode registers */
+
+ if (tegra->dram_type == DRAM_TYPE_DDR3) {
+ if (timing->emc_mode_1 != tegra->last_timing.emc_mode_1)
+ emc_ccfifo_writel(tegra, timing->emc_mode_1, EMC_EMRS);
+ if (timing->emc_mode_2 != tegra->last_timing.emc_mode_2)
+ emc_ccfifo_writel(tegra, timing->emc_mode_2, EMC_EMRS2);
+
+ if ((timing->emc_mode_reset !=
+ tegra->last_timing.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(tegra, val, EMC_MRS);
+ }
+ } else {
+ if (timing->emc_mode_2 != tegra->last_timing.emc_mode_2)
+ emc_ccfifo_writel(tegra, timing->emc_mode_2, EMC_MRW2);
+ if (timing->emc_mode_1 != tegra->last_timing.emc_mode_1)
+ emc_ccfifo_writel(tegra, timing->emc_mode_1, EMC_MRW);
+ if (timing->emc_mode_4 != tegra->last_timing.emc_mode_4)
+ emc_ccfifo_writel(tegra, timing->emc_mode_4, EMC_MRW4);
+ }
+
+ /* Issue ZCAL command if turning ZCAL on */
+
+ if (timing->emc_zcal_interval != 0 &&
+ tegra->last_timing.emc_zcal_interval == 0) {
+ emc_ccfifo_writel(tegra, EMC_ZQ_CAL_LONG_CMD_DEV0, EMC_ZQ_CAL);
+ if (tegra->dram_num > 1)
+ emc_ccfifo_writel(tegra, EMC_ZQ_CAL_LONG_CMD_DEV1,
+ EMC_ZQ_CAL);
+ }
+
+ /* Write to RO register to remove stall after change */
+
+ emc_ccfifo_writel(tegra, 0, EMC_CCFIFO_STATUS);
+
+ if (timing->emc_cfg_2 & EMC_CFG_2_DIS_STP_OB_CLK_DURING_NON_WR)
+ emc_ccfifo_writel(tegra, timing->emc_cfg_2, EMC_CFG_2);
+
+ /* Disable AUTO_CAL for clock change */
+
+ emc_seq_disable_auto_cal(tegra);
+
+ /* Read MC register to wait until programming has settled */
+
+ readl(tegra->mc_regs + MC_EMEM_ADR_CFG);
+ readl(tegra->emc_regs + EMC_INTSTATUS);
+
+ /* Program new parent and divisor. This triggers the EMC state machine
+ * to change timings. */
+
+ writel(car_value, tegra->clk_regs + CLK_SOURCE_EMC);
+ readl(tegra->clk_regs + CLK_SOURCE_EMC);
+
+ /* Wait until the state machine has settled */
+
+ emc_seq_wait_clkchange(tegra);
+
+ /* Restore AUTO_CAL */
+
+ if (timing->emc_ctt_term_ctrl != tegra->last_timing.emc_ctt_term_ctrl)
+ writel(timing->emc_auto_cal_interval,
+ tegra->emc_regs + EMC_AUTO_CAL_INTERVAL);
+
+ /* Restore dynamic self-refresh */
+
+ if (timing->emc_cfg & EMC_CFG_PWR_MASK)
+ writel(timing->emc_cfg, tegra->emc_regs + EMC_CFG);
+
+ /* Set ZCAL wait count */
+
+ writel(timing->emc_zcal_cnt_long, tegra->emc_regs + EMC_ZCAL_WAIT_CNT);
+
+ /* LPDDR3: Turn off BGBIAS if low frequency */
+
+ if (tegra->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, tegra->emc_regs + EMC_BGBIAS_CTL0);
+ } else {
+ if (tegra->dram_type == DRAM_TYPE_DDR3 &&
+ readl(tegra->emc_regs + EMC_BGBIAS_CTL0) !=
+ timing->emc_bgbias_ctl0) {
+ writel(timing->emc_bgbias_ctl0,
+ tegra->emc_regs + EMC_BGBIAS_CTL0);
+ }
+
+ writel(timing->emc_auto_cal_interval,
+ tegra->emc_regs + EMC_AUTO_CAL_INTERVAL);
+ }
+
+ /* Wait for timing to settle */
+
+ udelay(2);
+
+ /* Reprogram SEL_DPD_CTRL */
+
+ writel(timing->emc_sel_dpd_ctrl, tegra->emc_regs + EMC_SEL_DPD_CTRL);
+ emc_seq_update_timing(tegra);
+}
+
+/* * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Common clock framework callback implementations *
+ * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+unsigned long emc_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
+{
+ struct tegra_emc *tegra = container_of(hw, struct tegra_emc, hw);
+ u32 val;
+ u32 div;
+
+ /* CCF wrongly assumes that the parent won't change during set_rate,
+ * so get the parent rate explicitly. */
+ parent_rate = __clk_get_rate(__clk_get_parent(hw->clk));
+
+ val = readl(tegra->clk_regs + CLK_SOURCE_EMC);
+ div = val & CLK_SOURCE_EMC_EMC_2X_CLK_DIVISOR_MASK;
+
+ return parent_rate / (div + 2) * 2;
+}
+
+/* Rounds up unless no higher rate exists, in which case down. This way is
+ * safer since things have EMC rate floors. Also don't touch parent_rate
+ * since we don't want the CCF to play with our parent clocks. */
+long emc_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *parent_rate)
+{
+ struct tegra_emc *tegra = container_of(hw, struct tegra_emc, hw);
+ int i;
+
+ /* Returning the original rate will lead to a more sensible error
+ * message when emc_set_rate fails. */
+ if (tegra->num_timings == 0)
+ return rate;
+
+ for (i = 0; i < tegra->num_timings; ++i) {
+ struct emc_timing *timing = tegra->timings + i;
+
+ if (timing->rate >= rate)
+ return timing->rate;
+ }
+
+ return tegra->timings[tegra->num_timings - 1].rate;
+}
+
+u8 emc_get_parent(struct clk_hw *hw)
+{
+ struct tegra_emc *tegra = container_of(hw, struct tegra_emc, hw);
+ u32 val;
+
+ val = readl(tegra->clk_regs + CLK_SOURCE_EMC);
+
+ return (val >> CLK_SOURCE_EMC_EMC_2X_CLK_SRC_SHIFT)
+ & CLK_SOURCE_EMC_EMC_2X_CLK_SRC_MASK;
+}
+
+static int emc_set_timing(struct tegra_emc *tegra, struct emc_timing *timing)
+{
+ int err;
+ u8 div;
+ u32 car_value;
+ unsigned long parent_rate;
+
+ dev_dbg(&tegra->pdev->dev, "going to rate %ld prate %ld p %s\n",
+ timing->rate, timing->parent_rate,
+ __clk_get_name(timing->parent));
+
+ if (emc_get_parent(&tegra->hw) == timing->parent_index &&
+ clk_get_rate(timing->parent) != timing->parent_rate) {
+ BUG();
+ return -EINVAL;
+ }
+
+ tegra->changing_timing = true;
+
+ parent_rate = timing->parent_rate;
+ div = parent_rate / (timing->rate / 2) - 2;
+
+ car_value = 0;
+ car_value |= timing->parent_index <<
+ CLK_SOURCE_EMC_EMC_2X_CLK_SRC_SHIFT;
+ car_value |= div << CLK_SOURCE_EMC_EMC_2X_CLK_DIVISOR_SHIFT;
+
+ err = clk_set_rate(timing->parent, timing->parent_rate);
+ if (err) {
+ dev_err(&tegra->pdev->dev,
+ "cannot change parent %s rate to %ld: %d\n",
+ __clk_get_name(timing->parent),
+ timing->parent_rate, err);
+
+ return err;
+ }
+
+ err = clk_prepare_enable(timing->parent);
+ if (err) {
+ dev_err(&tegra->pdev->dev,
+ "cannot enable parent clock: %d\n", err);
+ return err;
+ }
+
+ emc_change_timing(tegra, timing, car_value);
+
+ __clk_reparent(tegra->hw.clk, timing->parent);
+ clk_disable_unprepare(tegra->prev_parent);
+
+ tegra->last_timing = *timing;
+ tegra->prev_parent = timing->parent;
+ tegra->changing_timing = false;
+
+ return 0;
+}
+
+/* Get backup timing to use as an intermediate step when a change between
+ * two timings with the same clock source has been requested. First try to
+ * find a timing with a higher clock rate to avoid a rate below any set rate
+ * floors. If that is not possible, find a lower rate. */
+static struct emc_timing *get_backup_timing(struct tegra_emc *tegra,
+ int timing_index)
+{
+ int i;
+
+ for (i = timing_index+1; i < tegra->num_timings; ++i) {
+ struct emc_timing *timing = tegra->timings + i;
+
+ if (emc_parent_clk_sources[timing->parent_index] !=
+ emc_parent_clk_sources[
+ tegra->timings[timing_index].parent_index])
+ return timing;
+ }
+
+ for (i = timing_index-1; i >= 0; --i) {
+ struct emc_timing *timing = tegra->timings + i;
+
+ if (emc_parent_clk_sources[timing->parent_index] !=
+ emc_parent_clk_sources[
+ tegra->timings[timing_index].parent_index])
+ return timing;
+ }
+
+ return NULL;
+}
+
+int emc_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct tegra_emc *tegra = container_of(hw, struct tegra_emc, hw);
+ struct emc_timing *timing = NULL;
+ int i, err;
+
+ /* When emc_set_timing changes the parent rate, CCF will propagate
+ * that downward to us, so ignore any set_rate calls while a rate
+ * change is already going on. */
+ if (tegra->changing_timing)
+ return 0;
+
+ for (i = 0; i < tegra->num_timings; ++i) {
+ if (tegra->timings[i].rate == rate) {
+ timing = tegra->timings + i;
+ break;
+ }
+ }
+
+ if (!timing) {
+ dev_err(&tegra->pdev->dev,
+ "cannot switch to rate %ld without emc table\n", rate);
+ return -EINVAL;
+ }
+
+ if (emc_parent_clk_sources[emc_get_parent(hw)] ==
+ emc_parent_clk_sources[timing->parent_index] &&
+ clk_get_rate(timing->parent) != timing->parent_rate) {
+ /* Parent clock source not changed but parent rate has changed,
+ * need to temporarily switch to another parent */
+
+ struct emc_timing *backup_timing;
+
+ backup_timing = get_backup_timing(tegra, i);
+ if (!backup_timing) {
+ dev_err(&tegra->pdev->dev,
+ "cannot find backup timing\n");
+ return -EINVAL;
+ }
+
+ dev_dbg(&tegra->pdev->dev,
+ "using %ld as backup rate when going to %ld\n",
+ backup_timing->rate, rate);
+
+ err = emc_set_timing(tegra, backup_timing);
+ if (err) {
+ dev_err(&tegra->pdev->dev,
+ "cannot set backup timing: %d\n",
+ err);
+ return err;
+ }
+ }
+
+ return emc_set_timing(tegra, timing);
+}
+
+/* * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Debugfs entry *
+ * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+static int emc_debug_rate_get(void *data, u64 *rate)
+{
+ struct tegra_emc *tegra = data;
+
+ *rate = clk_get_rate(tegra->hw.clk);
+
+ return 0;
+}
+
+static int emc_debug_rate_set(void *data, u64 rate)
+{
+ struct tegra_emc *tegra = data;
+
+ return clk_set_rate(tegra->hw.clk, rate);
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(emc_debug_rate_fops, emc_debug_rate_get,
+ emc_debug_rate_set, "%lld\n");
+
+const struct clk_ops tegra_clk_emc_ops = {
+ .recalc_rate = emc_recalc_rate,
+ .round_rate = emc_round_rate,
+ .set_rate = emc_set_rate,
+ .get_parent = emc_get_parent,
+};
+
+void emc_debugfs_init(struct tegra_emc *tegra)
+{
+ struct dentry *d;
+
+ d = debugfs_create_file("emc_rate", S_IRUGO | S_IWUSR, NULL, tegra,
+ &emc_debug_rate_fops);
+ if (!d)
+ dev_warn(&tegra->pdev->dev,
+ "failed to create debugfs entries\n");
+}
+
+/* * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Initialization and deinitialization *
+ * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+static void emc_read_current_timing(struct tegra_emc *tegra,
+ struct emc_timing *timing)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(t124_emc_burst_regs); ++i)
+ timing->emc_burst_data[i] =
+ readl(tegra->emc_regs + t124_emc_burst_regs[i]);
+
+ for (i = 0; i < ARRAY_SIZE(t124_mc_burst_regs); ++i)
+ timing->mc_burst_data[i] =
+ readl(tegra->mc_regs + t124_mc_burst_regs[i]);
+
+ timing->rate = clk_get_rate(tegra->hw.clk);
+ timing->emc_cfg = readl(tegra->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 void emc_init(struct tegra_emc *tegra)
+{
+ tegra->dram_type = readl(tegra->emc_regs + EMC_FBIO_CFG5)
+ & EMC_FBIO_CFG5_DRAM_TYPE_MASK >> EMC_FBIO_CFG5_DRAM_TYPE_SHIFT;
+ tegra->dram_num = (readl(tegra->mc_regs + MC_EMEM_ADR_CFG)
+ & MC_EMEM_ADR_CFG_EMEM_NUMDEV) + 1;
+
+ emc_read_current_timing(tegra, &tegra->last_timing);
+
+ tegra->prev_parent = clk_get_parent_by_index(
+ tegra->hw.clk, emc_get_parent(&tegra->hw));
+ tegra->changing_timing = false;
+}
+
+static int load_one_timing_from_dt(struct tegra_emc *tegra,
+ struct emc_timing *timing,
+ struct device_node *node)
+{
+ int err, i;
+ u32 tmp;
+
+ err = of_property_read_u32(node, "clock-frequency", &tmp);
+ if (err) {
+ dev_err(&tegra->pdev->dev,
+ "timing %s: failed to read rate\n", node->name);
+ return err;
+ }
+
+ timing->rate = tmp;
+
+ err = of_property_read_u32(node, "nvidia,parent-clock-frequency", &tmp);
+ if (err) {
+ dev_err(&tegra->pdev->dev,
+ "timing %s: failed to read parent rate\n", node->name);
+ return err;
+ }
+
+ timing->parent_rate = tmp;
+
+ err = of_property_read_u32_array(node, "nvidia,emc-burst-data",
+ timing->emc_burst_data,
+ ARRAY_SIZE(timing->emc_burst_data));
+ if (err) {
+ dev_err(&tegra->pdev->dev,
+ "timing %s: failed to read emc burst data\n",
+ node->name);
+ return err;
+ }
+
+ err = of_property_read_u32_array(node, "nvidia,mc-burst-data",
+ timing->mc_burst_data,
+ ARRAY_SIZE(timing->mc_burst_data));
+ if (err) {
+ dev_err(&tegra->pdev->dev,
+ "timing %s: failed to read mc burst data\n",
+ node->name);
+ return err;
+ }
+
+#define EMC_READ_PROP(prop, dtprop) { \
+ err = of_property_read_u32(node, dtprop, &timing->prop); \
+ if (err) { \
+ dev_err(&tegra->pdev->dev, \
+ "timing %s: failed to read " #prop "\n", \
+ node->name); \
+ return err; \
+ } \
+}
+
+ EMC_READ_PROP(emc_zcal_cnt_long, "nvidia,emc-zcal-cnt-long")
+ EMC_READ_PROP(emc_auto_cal_interval, "nvidia,emc-auto-cal-interval")
+ EMC_READ_PROP(emc_ctt_term_ctrl, "nvidia,emc-ctt-term-ctrl")
+ EMC_READ_PROP(emc_cfg, "nvidia,emc-cfg")
+ EMC_READ_PROP(emc_cfg_2, "nvidia,emc-cfg-2")
+ EMC_READ_PROP(emc_sel_dpd_ctrl, "nvidia,emc-sel-dpd-ctrl")
+ EMC_READ_PROP(emc_bgbias_ctl0, "nvidia,emc-bgbias-ctl0")
+ 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_config, "nvidia,emc-auto-cal-config")
+ EMC_READ_PROP(emc_mode_reset, "nvidia,emc-mode-reset")
+ 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")
+
+#undef EMC_READ_PROP
+
+ timing->parent = of_clk_get_by_name(node, "emc-parent");
+ if (IS_ERR(timing->parent)) {
+ dev_err(&tegra->pdev->dev,
+ "timing %s: failed to get parent clock\n",
+ node->name);
+ return PTR_ERR(timing->parent);
+ }
+
+ timing->parent_index = 0xff;
+ for (i = 0; i < ARRAY_SIZE(emc_parent_clk_names); ++i) {
+ if (!strcmp(emc_parent_clk_names[i],
+ __clk_get_name(timing->parent))) {
+ timing->parent_index = i;
+ break;
+ }
+ }
+ if (timing->parent_index == 0xff) {
+ dev_err(&tegra->pdev->dev,
+ "timing %s: %s is not a valid parent\n",
+ node->name, __clk_get_name(timing->parent));
+ clk_put(timing->parent);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int load_timings_from_dt(struct tegra_emc *tegra,
+ struct device_node *node)
+{
+ struct device_node *child;
+ int child_count = of_get_child_count(node);
+ unsigned long prev_rate = 0;
+ int i = 0, err;
+
+ tegra->timings = devm_kzalloc(&tegra->pdev->dev,
+ sizeof(struct emc_timing) * child_count,
+ GFP_KERNEL);
+ if (!tegra->timings)
+ return -ENOMEM;
+
+ tegra->num_timings = child_count;
+
+ for_each_child_of_node(node, child) {
+ struct emc_timing *timing = tegra->timings + (i++);
+
+ err = load_one_timing_from_dt(tegra, timing, child);
+ if (err)
+ return err;
+
+ if (timing->rate <= prev_rate) {
+ dev_err(&tegra->pdev->dev,
+ "timing %s: rate not increasing\n",
+ child->name);
+ clk_put(timing->parent);
+ return -EINVAL;
+ }
+
+ prev_rate = timing->rate;
+ }
+
+ return 0;
+}
+
+static void unload_timings(struct tegra_emc *tegra)
+{
+ int i;
+
+ for (i = 0; i < tegra->num_timings; ++i)
+ clk_put(tegra->timings[i].parent);
+}
+
+static int tegra_emc_remove(struct platform_device *pdev)
+{
+ struct tegra_emc *tegra = platform_get_drvdata(pdev);
+
+ unload_timings(tegra);
+
+ return 0;
+}
+
+static const struct of_device_id tegra_emc_of_match[] = {
+ { .compatible = "nvidia,tegra124-emc" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, tegra_emc_of_match);
+
+static const struct of_device_id tegra_car_of_match[] = {
+ { .compatible = "nvidia,tegra124-car" },
+ {}
+};
+
+static const struct of_device_id tegra_mc_of_match[] = {
+ { .compatible = "nvidia,tegra124-mc" },
+ {}
+};
+
+static int tegra_emc_probe(struct platform_device *pdev)
+{
+ struct tegra_emc *tegra;
+ struct clk *clk;
+ struct clk_init_data init;
+ struct device_node *node;
+ struct resource node_res;
+ struct resource *res;
+ int err;
+
+ tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
+ if (!tegra)
+ return -ENOMEM;
+
+ tegra->pdev = pdev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ tegra->emc_regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(tegra->emc_regs)) {
+ dev_err(&pdev->dev, "failed to map EMC regs\n");
+ return PTR_ERR(tegra->emc_regs);
+ }
+
+ node = of_find_matching_node(NULL, tegra_car_of_match);
+ err = of_address_to_resource(node, 0, &node_res);
+ if (err)
+ dev_err(&pdev->dev, "failed to get CAR registers\n");
+
+ tegra->clk_regs = devm_ioremap(&pdev->dev, node_res.start,
+ resource_size(&node_res));
+ if (!tegra->clk_regs) {
+ dev_err(&pdev->dev, "could not map CAR registers\n");
+ return -ENOMEM;
+ }
+
+ /* First try to get MC registers from the MC device tree node.
+ * If that doesn't exist, try to get them from the second register
+ * range in our node. */
+
+ node = of_find_matching_node(NULL, tegra_mc_of_match);
+ err = of_address_to_resource(node, 0, &node_res);
+ if (err) {
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ tegra->mc_regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(tegra->mc_regs)) {
+ dev_err(&pdev->dev, "failed to get MC registers\n");
+ return PTR_ERR(tegra->mc_regs);
+ }
+ } else {
+ tegra->mc_regs = devm_ioremap(&pdev->dev, node_res.start,
+ resource_size(&node_res));
+ if (!tegra->mc_regs) {
+ dev_err(&pdev->dev, "could not map MC registers\n");
+ return -ENOMEM;
+ }
+ }
+
+ node = of_get_child_by_name(pdev->dev.of_node, "timings");
+ if (node) {
+ err = load_timings_from_dt(tegra, node);
+ if (err)
+ return err;
+ } else {
+ tegra->num_timings = 0;
+ }
+
+ if (tegra->num_timings == 0)
+ dev_warn(&pdev->dev, "no memory timings registered\n");
+
+ init.name = "emc";
+ init.ops = &tegra_clk_emc_ops;
+ init.flags = 0;
+ init.parent_names = emc_parent_clk_names;
+ init.num_parents = ARRAY_SIZE(emc_parent_clk_names);
+
+ tegra->hw.init = &init;
+
+ clk = devm_clk_register(&pdev->dev, &tegra->hw);
+ if (IS_ERR(clk)) {
+ unload_timings(tegra);
+ return PTR_ERR(clk);
+ }
+
+ /* Allow debugging tools to see the EMC clock */
+ clk_register_clkdev(clk, "emc", "tegra-clk-debug");
+
+ clk_prepare_enable(clk);
+
+ platform_set_drvdata(pdev, tegra);
+
+ emc_init(tegra);
+ emc_debugfs_init(tegra);
+
+ return 0;
+};
+
+static struct platform_driver tegra_emc_driver = {
+ .probe = tegra_emc_probe,
+ .remove = tegra_emc_remove,
+ .driver = {
+ .name = "tegra-emc",
+ .of_match_table = tegra_emc_of_match,
+ },
+};
+module_platform_driver(tegra_emc_driver);
+
+MODULE_AUTHOR("Mikko Perttunen <mperttunen@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Tegra124 EMC driver");
+MODULE_LICENSE("GPL v2");
--
1.8.1.5
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