Re: [PATCH v10 12/15] memory: tegra: Introduce Tegra30 EMC driver
From: Peter Geis
Date: Sat Oct 05 2019 - 12:29:15 EST
Tested on the Ouya (tegra30).
Tested-by: Peter Geis <pgwipeout@xxxxxxxxx>
On Sun, Aug 11, 2019 at 5:02 PM Dmitry Osipenko <digetx@xxxxxxxxx> wrote:
>
> Introduce driver for the External Memory Controller (EMC) found on Tegra30
> chips, it controls the external DRAM on the board. The purpose of this
> driver is to program memory timing for external memory on the EMC clock
> rate change.
>
> Acked-by: Peter De Schrijver <pdeschrijver@xxxxxxxxxx>
> Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
> ---
> drivers/memory/tegra/Kconfig | 10 +
> drivers/memory/tegra/Makefile | 1 +
> drivers/memory/tegra/mc.c | 9 +-
> drivers/memory/tegra/mc.h | 30 +-
> drivers/memory/tegra/tegra30-emc.c | 1232 ++++++++++++++++++++++++++++
> drivers/memory/tegra/tegra30.c | 42 +
> include/soc/tegra/mc.h | 2 +-
> 7 files changed, 1311 insertions(+), 15 deletions(-)
> create mode 100644 drivers/memory/tegra/tegra30-emc.c
>
> diff --git a/drivers/memory/tegra/Kconfig b/drivers/memory/tegra/Kconfig
> index 4680124ddcab..fbfbaada61a2 100644
> --- a/drivers/memory/tegra/Kconfig
> +++ b/drivers/memory/tegra/Kconfig
> @@ -17,6 +17,16 @@ config TEGRA20_EMC
> This driver is required to change memory timings / clock rate for
> external memory.
>
> +config TEGRA30_EMC
> + bool "NVIDIA Tegra30 External Memory Controller driver"
> + default y
> + depends on TEGRA_MC && ARCH_TEGRA_3x_SOC
> + help
> + This driver is for the External Memory Controller (EMC) found on
> + Tegra30 chips. The EMC controls the external DRAM on the board.
> + This driver is required to change memory timings / clock rate for
> + external memory.
> +
> config TEGRA124_EMC
> bool "NVIDIA Tegra124 External Memory Controller driver"
> default y
> diff --git a/drivers/memory/tegra/Makefile b/drivers/memory/tegra/Makefile
> index 3971a6b7c487..3d23c4261104 100644
> --- a/drivers/memory/tegra/Makefile
> +++ b/drivers/memory/tegra/Makefile
> @@ -11,5 +11,6 @@ tegra-mc-$(CONFIG_ARCH_TEGRA_210_SOC) += tegra210.o
> obj-$(CONFIG_TEGRA_MC) += tegra-mc.o
>
> obj-$(CONFIG_TEGRA20_EMC) += tegra20-emc.o
> +obj-$(CONFIG_TEGRA30_EMC) += tegra30-emc.o
> obj-$(CONFIG_TEGRA124_EMC) += tegra124-emc.o
> obj-$(CONFIG_ARCH_TEGRA_186_SOC) += tegra186.o
> diff --git a/drivers/memory/tegra/mc.c b/drivers/memory/tegra/mc.c
> index 3d8d322511c5..43819e8df95c 100644
> --- a/drivers/memory/tegra/mc.c
> +++ b/drivers/memory/tegra/mc.c
> @@ -48,9 +48,6 @@
> #define MC_EMEM_ADR_CFG 0x54
> #define MC_EMEM_ADR_CFG_EMEM_NUMDEV BIT(0)
>
> -#define MC_TIMING_CONTROL 0xfc
> -#define MC_TIMING_UPDATE BIT(0)
> -
> static const struct of_device_id tegra_mc_of_match[] = {
> #ifdef CONFIG_ARCH_TEGRA_2x_SOC
> { .compatible = "nvidia,tegra20-mc-gart", .data = &tegra20_mc_soc },
> @@ -307,7 +304,7 @@ static int tegra_mc_setup_latency_allowance(struct tegra_mc *mc)
> return 0;
> }
>
> -void tegra_mc_write_emem_configuration(struct tegra_mc *mc, unsigned long rate)
> +int tegra_mc_write_emem_configuration(struct tegra_mc *mc, unsigned long rate)
> {
> unsigned int i;
> struct tegra_mc_timing *timing = NULL;
> @@ -322,11 +319,13 @@ void tegra_mc_write_emem_configuration(struct tegra_mc *mc, unsigned long rate)
> if (!timing) {
> dev_err(mc->dev, "no memory timing registered for rate %lu\n",
> rate);
> - return;
> + return -EINVAL;
> }
>
> for (i = 0; i < mc->soc->num_emem_regs; ++i)
> mc_writel(mc, timing->emem_data[i], mc->soc->emem_regs[i]);
> +
> + return 0;
> }
>
> unsigned int tegra_mc_get_emem_device_count(struct tegra_mc *mc)
> diff --git a/drivers/memory/tegra/mc.h b/drivers/memory/tegra/mc.h
> index f9353494b708..410efc4d7e7b 100644
> --- a/drivers/memory/tegra/mc.h
> +++ b/drivers/memory/tegra/mc.h
> @@ -6,20 +6,32 @@
> #ifndef MEMORY_TEGRA_MC_H
> #define MEMORY_TEGRA_MC_H
>
> +#include <linux/bits.h>
> #include <linux/io.h>
> #include <linux/types.h>
>
> #include <soc/tegra/mc.h>
>
> -#define MC_INT_DECERR_MTS (1 << 16)
> -#define MC_INT_SECERR_SEC (1 << 13)
> -#define MC_INT_DECERR_VPR (1 << 12)
> -#define MC_INT_INVALID_APB_ASID_UPDATE (1 << 11)
> -#define MC_INT_INVALID_SMMU_PAGE (1 << 10)
> -#define MC_INT_ARBITRATION_EMEM (1 << 9)
> -#define MC_INT_SECURITY_VIOLATION (1 << 8)
> -#define MC_INT_INVALID_GART_PAGE (1 << 7)
> -#define MC_INT_DECERR_EMEM (1 << 6)
> +#define MC_INT_DECERR_MTS BIT(16)
> +#define MC_INT_SECERR_SEC BIT(13)
> +#define MC_INT_DECERR_VPR BIT(12)
> +#define MC_INT_INVALID_APB_ASID_UPDATE BIT(11)
> +#define MC_INT_INVALID_SMMU_PAGE BIT(10)
> +#define MC_INT_ARBITRATION_EMEM BIT(9)
> +#define MC_INT_SECURITY_VIOLATION BIT(8)
> +#define MC_INT_INVALID_GART_PAGE BIT(7)
> +#define MC_INT_DECERR_EMEM BIT(6)
> +
> +#define MC_EMEM_ARB_OUTSTANDING_REQ 0x94
> +#define MC_EMEM_ARB_OUTSTANDING_REQ_MAX_MASK 0x1ff
> +#define MC_EMEM_ARB_OUTSTANDING_REQ_HOLDOFF_OVERRIDE BIT(30)
> +#define MC_EMEM_ARB_OUTSTANDING_REQ_LIMIT_ENABLE BIT(31)
> +
> +#define MC_EMEM_ARB_OVERRIDE 0xe8
> +#define MC_EMEM_ARB_OVERRIDE_EACK_MASK 0x3
> +
> +#define MC_TIMING_CONTROL 0xfc
> +#define MC_TIMING_UPDATE BIT(0)
>
> static inline u32 mc_readl(struct tegra_mc *mc, unsigned long offset)
> {
> diff --git a/drivers/memory/tegra/tegra30-emc.c b/drivers/memory/tegra/tegra30-emc.c
> new file mode 100644
> index 000000000000..6929980bf907
> --- /dev/null
> +++ b/drivers/memory/tegra/tegra30-emc.c
> @@ -0,0 +1,1232 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Tegra30 External Memory Controller driver
> + *
> + * Based on downstream driver from NVIDIA and tegra124-emc.c
> + * Copyright (C) 2011-2014 NVIDIA Corporation
> + *
> + * Author: Dmitry Osipenko <digetx@xxxxxxxxx>
> + * Copyright (C) 2019 GRATE-DRIVER project
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clk/tegra.h>
> +#include <linux/completion.h>
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/iopoll.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +#include <linux/sort.h>
> +#include <linux/types.h>
> +
> +#include <soc/tegra/fuse.h>
> +
> +#include "mc.h"
> +
> +#define EMC_INTSTATUS 0x000
> +#define EMC_INTMASK 0x004
> +#define EMC_DBG 0x008
> +#define EMC_CFG 0x00c
> +#define EMC_REFCTRL 0x020
> +#define EMC_TIMING_CONTROL 0x028
> +#define EMC_RC 0x02c
> +#define EMC_RFC 0x030
> +#define EMC_RAS 0x034
> +#define EMC_RP 0x038
> +#define EMC_R2W 0x03c
> +#define EMC_W2R 0x040
> +#define EMC_R2P 0x044
> +#define EMC_W2P 0x048
> +#define EMC_RD_RCD 0x04c
> +#define EMC_WR_RCD 0x050
> +#define EMC_RRD 0x054
> +#define EMC_REXT 0x058
> +#define EMC_WDV 0x05c
> +#define EMC_QUSE 0x060
> +#define EMC_QRST 0x064
> +#define EMC_QSAFE 0x068
> +#define EMC_RDV 0x06c
> +#define EMC_REFRESH 0x070
> +#define EMC_BURST_REFRESH_NUM 0x074
> +#define EMC_PDEX2WR 0x078
> +#define EMC_PDEX2RD 0x07c
> +#define EMC_PCHG2PDEN 0x080
> +#define EMC_ACT2PDEN 0x084
> +#define EMC_AR2PDEN 0x088
> +#define EMC_RW2PDEN 0x08c
> +#define EMC_TXSR 0x090
> +#define EMC_TCKE 0x094
> +#define EMC_TFAW 0x098
> +#define EMC_TRPAB 0x09c
> +#define EMC_TCLKSTABLE 0x0a0
> +#define EMC_TCLKSTOP 0x0a4
> +#define EMC_TREFBW 0x0a8
> +#define EMC_QUSE_EXTRA 0x0ac
> +#define EMC_ODT_WRITE 0x0b0
> +#define EMC_ODT_READ 0x0b4
> +#define EMC_WEXT 0x0b8
> +#define EMC_CTT 0x0bc
> +#define EMC_MRS_WAIT_CNT 0x0c8
> +#define EMC_MRS 0x0cc
> +#define EMC_EMRS 0x0d0
> +#define EMC_SELF_REF 0x0e0
> +#define EMC_MRW 0x0e8
> +#define EMC_XM2DQSPADCTRL3 0x0f8
> +#define EMC_FBIO_SPARE 0x100
> +#define EMC_FBIO_CFG5 0x104
> +#define EMC_FBIO_CFG6 0x114
> +#define EMC_CFG_RSV 0x120
> +#define EMC_AUTO_CAL_CONFIG 0x2a4
> +#define EMC_AUTO_CAL_INTERVAL 0x2a8
> +#define EMC_AUTO_CAL_STATUS 0x2ac
> +#define EMC_STATUS 0x2b4
> +#define EMC_CFG_2 0x2b8
> +#define EMC_CFG_DIG_DLL 0x2bc
> +#define EMC_CFG_DIG_DLL_PERIOD 0x2c0
> +#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_XM2CMDPADCTRL 0x2f0
> +#define EMC_XM2DQSPADCTRL2 0x2fc
> +#define EMC_XM2DQPADCTRL2 0x304
> +#define EMC_XM2CLKPADCTRL 0x308
> +#define EMC_XM2COMPPADCTRL 0x30c
> +#define EMC_XM2VTTGENPADCTRL 0x310
> +#define EMC_XM2VTTGENPADCTRL2 0x314
> +#define EMC_XM2QUSEPADCTRL 0x318
> +#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_BEFORE_CLKCHANGE 0x3c8
> +#define EMC_STALL_THEN_EXE_AFTER_CLKCHANGE 0x3cc
> +#define EMC_UNSTALL_RW_AFTER_CLKCHANGE 0x3d0
> +#define EMC_SEL_DPD_CTRL 0x3d8
> +#define EMC_PRE_REFRESH_REQ_CNT 0x3dc
> +#define EMC_DYN_SELF_REF_CONTROL 0x3e0
> +#define EMC_TXSRDLL 0x3e4
> +
> +#define EMC_STATUS_TIMING_UPDATE_STALLED BIT(23)
> +
> +#define EMC_MODE_SET_DLL_RESET BIT(8)
> +#define EMC_MODE_SET_LONG_CNT BIT(26)
> +
> +#define EMC_SELF_REF_CMD_ENABLED BIT(0)
> +
> +#define DRAM_DEV_SEL_ALL (0 << 30)
> +#define DRAM_DEV_SEL_0 (2 << 30)
> +#define DRAM_DEV_SEL_1 (1 << 30)
> +#define DRAM_BROADCAST(num) \
> + ((num) > 1 ? DRAM_DEV_SEL_ALL : DRAM_DEV_SEL_0)
> +
> +#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_DBG_READ_MUX_ASSEMBLY BIT(0)
> +#define EMC_DBG_WRITE_MUX_ACTIVE BIT(1)
> +#define EMC_DBG_FORCE_UPDATE BIT(2)
> +#define EMC_DBG_CFG_PRIORITY BIT(24)
> +
> +#define EMC_CFG5_QUSE_MODE_SHIFT 13
> +#define EMC_CFG5_QUSE_MODE_MASK (7 << EMC_CFG5_QUSE_MODE_SHIFT)
> +
> +#define EMC_CFG5_QUSE_MODE_INTERNAL_LPBK 2
> +#define EMC_CFG5_QUSE_MODE_PULSE_INTERN 3
> +
> +#define EMC_SEL_DPD_CTRL_QUSE_DPD_ENABLE BIT(9)
> +
> +#define EMC_XM2COMPPADCTRL_VREF_CAL_ENABLE BIT(10)
> +
> +#define EMC_XM2QUSEPADCTRL_IVREF_ENABLE BIT(4)
> +
> +#define EMC_XM2DQSPADCTRL2_VREF_ENABLE BIT(5)
> +#define EMC_XM2DQSPADCTRL3_VREF_ENABLE BIT(5)
> +
> +#define EMC_AUTO_CAL_STATUS_ACTIVE BIT(31)
> +
> +#define EMC_FBIO_CFG5_DRAM_TYPE_MASK 0x3
> +
> +#define EMC_MRS_WAIT_CNT_SHORT_WAIT_MASK 0x3ff
> +#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_REFCTRL_DEV_SEL_MASK 0x3
> +#define EMC_REFCTRL_ENABLE BIT(31)
> +#define EMC_REFCTRL_ENABLE_ALL(num) \
> + (((num) > 1 ? 0 : 2) | EMC_REFCTRL_ENABLE)
> +#define EMC_REFCTRL_DISABLE_ALL(num) ((num) > 1 ? 0 : 2)
> +
> +#define EMC_CFG_PERIODIC_QRST BIT(21)
> +#define EMC_CFG_DYN_SREF_ENABLE BIT(28)
> +
> +#define EMC_CLKCHANGE_REQ_ENABLE BIT(0)
> +#define EMC_CLKCHANGE_PD_ENABLE BIT(1)
> +#define EMC_CLKCHANGE_SR_ENABLE BIT(2)
> +
> +#define EMC_TIMING_UPDATE BIT(0)
> +
> +#define EMC_REFRESH_OVERFLOW_INT BIT(3)
> +#define EMC_CLKCHANGE_COMPLETE_INT BIT(4)
> +
> +enum emc_dram_type {
> + DRAM_TYPE_DDR3,
> + DRAM_TYPE_DDR1,
> + DRAM_TYPE_LPDDR2,
> + DRAM_TYPE_DDR2,
> +};
> +
> +enum emc_dll_change {
> + DLL_CHANGE_NONE,
> + DLL_CHANGE_ON,
> + DLL_CHANGE_OFF
> +};
> +
> +static const u16 emc_timing_registers[] = {
> + [0] = EMC_RC,
> + [1] = EMC_RFC,
> + [2] = EMC_RAS,
> + [3] = EMC_RP,
> + [4] = EMC_R2W,
> + [5] = EMC_W2R,
> + [6] = EMC_R2P,
> + [7] = EMC_W2P,
> + [8] = EMC_RD_RCD,
> + [9] = EMC_WR_RCD,
> + [10] = EMC_RRD,
> + [11] = EMC_REXT,
> + [12] = EMC_WEXT,
> + [13] = EMC_WDV,
> + [14] = EMC_QUSE,
> + [15] = EMC_QRST,
> + [16] = EMC_QSAFE,
> + [17] = EMC_RDV,
> + [18] = EMC_REFRESH,
> + [19] = EMC_BURST_REFRESH_NUM,
> + [20] = EMC_PRE_REFRESH_REQ_CNT,
> + [21] = EMC_PDEX2WR,
> + [22] = EMC_PDEX2RD,
> + [23] = EMC_PCHG2PDEN,
> + [24] = EMC_ACT2PDEN,
> + [25] = EMC_AR2PDEN,
> + [26] = EMC_RW2PDEN,
> + [27] = EMC_TXSR,
> + [28] = EMC_TXSRDLL,
> + [29] = EMC_TCKE,
> + [30] = EMC_TFAW,
> + [31] = EMC_TRPAB,
> + [32] = EMC_TCLKSTABLE,
> + [33] = EMC_TCLKSTOP,
> + [34] = EMC_TREFBW,
> + [35] = EMC_QUSE_EXTRA,
> + [36] = EMC_FBIO_CFG6,
> + [37] = EMC_ODT_WRITE,
> + [38] = EMC_ODT_READ,
> + [39] = EMC_FBIO_CFG5,
> + [40] = EMC_CFG_DIG_DLL,
> + [41] = EMC_CFG_DIG_DLL_PERIOD,
> + [42] = EMC_DLL_XFORM_DQS0,
> + [43] = EMC_DLL_XFORM_DQS1,
> + [44] = EMC_DLL_XFORM_DQS2,
> + [45] = EMC_DLL_XFORM_DQS3,
> + [46] = EMC_DLL_XFORM_DQS4,
> + [47] = EMC_DLL_XFORM_DQS5,
> + [48] = EMC_DLL_XFORM_DQS6,
> + [49] = EMC_DLL_XFORM_DQS7,
> + [50] = EMC_DLL_XFORM_QUSE0,
> + [51] = EMC_DLL_XFORM_QUSE1,
> + [52] = EMC_DLL_XFORM_QUSE2,
> + [53] = EMC_DLL_XFORM_QUSE3,
> + [54] = EMC_DLL_XFORM_QUSE4,
> + [55] = EMC_DLL_XFORM_QUSE5,
> + [56] = EMC_DLL_XFORM_QUSE6,
> + [57] = EMC_DLL_XFORM_QUSE7,
> + [58] = EMC_DLI_TRIM_TXDQS0,
> + [59] = EMC_DLI_TRIM_TXDQS1,
> + [60] = EMC_DLI_TRIM_TXDQS2,
> + [61] = EMC_DLI_TRIM_TXDQS3,
> + [62] = EMC_DLI_TRIM_TXDQS4,
> + [63] = EMC_DLI_TRIM_TXDQS5,
> + [64] = EMC_DLI_TRIM_TXDQS6,
> + [65] = EMC_DLI_TRIM_TXDQS7,
> + [66] = EMC_DLL_XFORM_DQ0,
> + [67] = EMC_DLL_XFORM_DQ1,
> + [68] = EMC_DLL_XFORM_DQ2,
> + [69] = EMC_DLL_XFORM_DQ3,
> + [70] = EMC_XM2CMDPADCTRL,
> + [71] = EMC_XM2DQSPADCTRL2,
> + [72] = EMC_XM2DQPADCTRL2,
> + [73] = EMC_XM2CLKPADCTRL,
> + [74] = EMC_XM2COMPPADCTRL,
> + [75] = EMC_XM2VTTGENPADCTRL,
> + [76] = EMC_XM2VTTGENPADCTRL2,
> + [77] = EMC_XM2QUSEPADCTRL,
> + [78] = EMC_XM2DQSPADCTRL3,
> + [79] = EMC_CTT_TERM_CTRL,
> + [80] = EMC_ZCAL_INTERVAL,
> + [81] = EMC_ZCAL_WAIT_CNT,
> + [82] = EMC_MRS_WAIT_CNT,
> + [83] = EMC_AUTO_CAL_CONFIG,
> + [84] = EMC_CTT,
> + [85] = EMC_CTT_DURATION,
> + [86] = EMC_DYN_SELF_REF_CONTROL,
> + [87] = EMC_FBIO_SPARE,
> + [88] = EMC_CFG_RSV,
> +};
> +
> +struct emc_timing {
> + unsigned long rate;
> +
> + u32 data[ARRAY_SIZE(emc_timing_registers)];
> +
> + u32 emc_auto_cal_interval;
> + u32 emc_mode_1;
> + u32 emc_mode_2;
> + u32 emc_mode_reset;
> + u32 emc_zcal_cnt_long;
> + bool emc_cfg_periodic_qrst;
> + bool emc_cfg_dyn_self_ref;
> +};
> +
> +struct tegra_emc {
> + struct device *dev;
> + struct tegra_mc *mc;
> + struct completion clk_handshake_complete;
> + struct notifier_block clk_nb;
> + struct clk *clk;
> + void __iomem *regs;
> + unsigned int irq;
> +
> + struct emc_timing *timings;
> + unsigned int num_timings;
> +
> + u32 mc_override;
> + u32 emc_cfg;
> +
> + u32 emc_mode_1;
> + u32 emc_mode_2;
> + u32 emc_mode_reset;
> +
> + bool vref_cal_toggle : 1;
> + bool zcal_long : 1;
> + bool dll_on : 1;
> + bool prepared : 1;
> + bool bad_state : 1;
> +};
> +
> +static irqreturn_t tegra_emc_isr(int irq, void *data)
> +{
> + struct tegra_emc *emc = data;
> + u32 intmask = EMC_REFRESH_OVERFLOW_INT | EMC_CLKCHANGE_COMPLETE_INT;
> + u32 status;
> +
> + status = readl_relaxed(emc->regs + EMC_INTSTATUS) & intmask;
> + if (!status)
> + return IRQ_NONE;
> +
> + /* notify about EMC-CAR handshake completion */
> + if (status & EMC_CLKCHANGE_COMPLETE_INT)
> + complete(&emc->clk_handshake_complete);
> +
> + /* notify about HW problem */
> + if (status & EMC_REFRESH_OVERFLOW_INT)
> + dev_err_ratelimited(emc->dev,
> + "refresh request overflow timeout\n");
> +
> + /* clear interrupts */
> + writel_relaxed(status, emc->regs + EMC_INTSTATUS);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static struct emc_timing *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;
> +}
> +
> +static bool emc_dqs_preset(struct tegra_emc *emc, struct emc_timing *timing,
> + bool *schmitt_to_vref)
> +{
> + bool preset = false;
> + u32 val;
> +
> + if (timing->data[71] & EMC_XM2DQSPADCTRL2_VREF_ENABLE) {
> + val = readl_relaxed(emc->regs + EMC_XM2DQSPADCTRL2);
> +
> + if (!(val & EMC_XM2DQSPADCTRL2_VREF_ENABLE)) {
> + val |= EMC_XM2DQSPADCTRL2_VREF_ENABLE;
> + writel_relaxed(val, emc->regs + EMC_XM2DQSPADCTRL2);
> +
> + preset = true;
> + }
> + }
> +
> + if (timing->data[78] & EMC_XM2DQSPADCTRL3_VREF_ENABLE) {
> + val = readl_relaxed(emc->regs + EMC_XM2DQSPADCTRL3);
> +
> + if (!(val & EMC_XM2DQSPADCTRL3_VREF_ENABLE)) {
> + val |= EMC_XM2DQSPADCTRL3_VREF_ENABLE;
> + writel_relaxed(val, emc->regs + EMC_XM2DQSPADCTRL3);
> +
> + preset = true;
> + }
> + }
> +
> + if (timing->data[77] & EMC_XM2QUSEPADCTRL_IVREF_ENABLE) {
> + val = readl_relaxed(emc->regs + EMC_XM2QUSEPADCTRL);
> +
> + if (!(val & EMC_XM2QUSEPADCTRL_IVREF_ENABLE)) {
> + val |= EMC_XM2QUSEPADCTRL_IVREF_ENABLE;
> + writel_relaxed(val, emc->regs + EMC_XM2QUSEPADCTRL);
> +
> + *schmitt_to_vref = true;
> + preset = true;
> + }
> + }
> +
> + return preset;
> +}
> +
> +static int emc_seq_update_timing(struct tegra_emc *emc)
> +{
> + u32 val;
> + int err;
> +
> + writel_relaxed(EMC_TIMING_UPDATE, emc->regs + EMC_TIMING_CONTROL);
> +
> + err = readl_relaxed_poll_timeout_atomic(emc->regs + EMC_STATUS, val,
> + !(val & EMC_STATUS_TIMING_UPDATE_STALLED),
> + 1, 200);
> + if (err) {
> + dev_err(emc->dev, "failed to update timing: %d\n", err);
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +static int emc_prepare_mc_clk_cfg(struct tegra_emc *emc, unsigned long rate)
> +{
> + struct tegra_mc *mc = emc->mc;
> + unsigned int misc0_index = 16;
> + unsigned int i;
> + bool same;
> +
> + for (i = 0; i < mc->num_timings; i++) {
> + if (mc->timings[i].rate != rate)
> + continue;
> +
> + if (mc->timings[i].emem_data[misc0_index] & BIT(27))
> + same = true;
> + else
> + same = false;
> +
> + return tegra20_clk_prepare_emc_mc_same_freq(emc->clk, same);
> + }
> +
> + return -EINVAL;
> +}
> +
> +static int emc_prepare_timing_change(struct tegra_emc *emc, unsigned long rate)
> +{
> + struct emc_timing *timing = emc_find_timing(emc, rate);
> + enum emc_dll_change dll_change;
> + enum emc_dram_type dram_type;
> + bool schmitt_to_vref = false;
> + unsigned int pre_wait = 0;
> + bool qrst_used = false;
> + unsigned int dram_num;
> + unsigned int i;
> + u32 fbio_cfg5;
> + u32 emc_dbg;
> + u32 val;
> + int err;
> +
> + if (!timing || emc->bad_state)
> + return -EINVAL;
> +
> + dev_dbg(emc->dev, "%s: using timing rate %lu for requested rate %lu\n",
> + __func__, timing->rate, rate);
> +
> + emc->bad_state = true;
> +
> + err = emc_prepare_mc_clk_cfg(emc, rate);
> + if (err) {
> + dev_err(emc->dev, "mc clock preparation failed: %d\n", err);
> + return err;
> + }
> +
> + emc->vref_cal_toggle = false;
> + emc->mc_override = mc_readl(emc->mc, MC_EMEM_ARB_OVERRIDE);
> + emc->emc_cfg = readl_relaxed(emc->regs + EMC_CFG);
> + emc_dbg = readl_relaxed(emc->regs + EMC_DBG);
> +
> + if (emc->dll_on == !!(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;
> +
> + emc->dll_on = !!(timing->emc_mode_1 & 0x1);
> +
> + if (timing->data[80] && !readl_relaxed(emc->regs + EMC_ZCAL_INTERVAL))
> + emc->zcal_long = true;
> + else
> + emc->zcal_long = false;
> +
> + fbio_cfg5 = readl_relaxed(emc->regs + EMC_FBIO_CFG5);
> + dram_type = fbio_cfg5 & EMC_FBIO_CFG5_DRAM_TYPE_MASK;
> +
> + dram_num = tegra_mc_get_emem_device_count(emc->mc);
> +
> + /* disable dynamic self-refresh */
> + if (emc->emc_cfg & EMC_CFG_DYN_SREF_ENABLE) {
> + emc->emc_cfg &= ~EMC_CFG_DYN_SREF_ENABLE;
> + writel_relaxed(emc->emc_cfg, emc->regs + EMC_CFG);
> +
> + pre_wait = 5;
> + }
> +
> + /* update MC arbiter settings */
> + val = mc_readl(emc->mc, MC_EMEM_ARB_OUTSTANDING_REQ);
> + if (!(val & MC_EMEM_ARB_OUTSTANDING_REQ_HOLDOFF_OVERRIDE) ||
> + ((val & MC_EMEM_ARB_OUTSTANDING_REQ_MAX_MASK) > 0x50)) {
> +
> + val = MC_EMEM_ARB_OUTSTANDING_REQ_LIMIT_ENABLE |
> + MC_EMEM_ARB_OUTSTANDING_REQ_HOLDOFF_OVERRIDE | 0x50;
> + mc_writel(emc->mc, val, MC_EMEM_ARB_OUTSTANDING_REQ);
> + mc_writel(emc->mc, MC_TIMING_UPDATE, MC_TIMING_CONTROL);
> + }
> +
> + if (emc->mc_override & MC_EMEM_ARB_OVERRIDE_EACK_MASK)
> + mc_writel(emc->mc,
> + emc->mc_override & ~MC_EMEM_ARB_OVERRIDE_EACK_MASK,
> + MC_EMEM_ARB_OVERRIDE);
> +
> + /* check DQ/DQS VREF delay */
> + if (emc_dqs_preset(emc, timing, &schmitt_to_vref)) {
> + if (pre_wait < 3)
> + pre_wait = 3;
> + }
> +
> + if (pre_wait) {
> + err = emc_seq_update_timing(emc);
> + if (err)
> + return err;
> +
> + udelay(pre_wait);
> + }
> +
> + /* disable auto-calibration if VREF mode is switching */
> + if (timing->emc_auto_cal_interval) {
> + val = readl_relaxed(emc->regs + EMC_XM2COMPPADCTRL);
> + val ^= timing->data[74];
> +
> + if (val & EMC_XM2COMPPADCTRL_VREF_CAL_ENABLE) {
> + writel_relaxed(0, emc->regs + EMC_AUTO_CAL_INTERVAL);
> +
> + err = readl_relaxed_poll_timeout_atomic(
> + emc->regs + EMC_AUTO_CAL_STATUS, val,
> + !(val & EMC_AUTO_CAL_STATUS_ACTIVE), 1, 300);
> + if (err) {
> + dev_err(emc->dev,
> + "failed to disable auto-cal: %d\n",
> + err);
> + return err;
> + }
> +
> + emc->vref_cal_toggle = true;
> + }
> + }
> +
> + /* program shadow registers */
> + for (i = 0; i < ARRAY_SIZE(timing->data); i++) {
> + /* EMC_XM2CLKPADCTRL should be programmed separately */
> + if (i != 73)
> + writel_relaxed(timing->data[i],
> + emc->regs + emc_timing_registers[i]);
> + }
> +
> + err = tegra_mc_write_emem_configuration(emc->mc, timing->rate);
> + if (err)
> + return err;
> +
> + /* DDR3: predict MRS long wait count */
> + if (dram_type == DRAM_TYPE_DDR3 && dll_change == DLL_CHANGE_ON) {
> + u32 cnt = 512;
> +
> + if (emc->zcal_long)
> + cnt -= dram_num * 256;
> +
> + val = timing->data[82] & EMC_MRS_WAIT_CNT_SHORT_WAIT_MASK;
> + if (cnt < val)
> + cnt = val;
> +
> + val = timing->data[82] & ~EMC_MRS_WAIT_CNT_LONG_WAIT_MASK;
> + val |= (cnt << EMC_MRS_WAIT_CNT_LONG_WAIT_SHIFT) &
> + EMC_MRS_WAIT_CNT_LONG_WAIT_MASK;
> +
> + writel_relaxed(val, emc->regs + EMC_MRS_WAIT_CNT);
> + }
> +
> + /* disable interrupt since read access is prohibited after stalling */
> + disable_irq(emc->irq);
> +
> + /* this read also completes the writes */
> + val = readl_relaxed(emc->regs + EMC_SEL_DPD_CTRL);
> +
> + if (!(val & EMC_SEL_DPD_CTRL_QUSE_DPD_ENABLE) && schmitt_to_vref) {
> + u32 cur_mode, new_mode;
> +
> + cur_mode = fbio_cfg5 & EMC_CFG5_QUSE_MODE_MASK;
> + cur_mode >>= EMC_CFG5_QUSE_MODE_SHIFT;
> +
> + new_mode = timing->data[39] & EMC_CFG5_QUSE_MODE_MASK;
> + new_mode >>= EMC_CFG5_QUSE_MODE_SHIFT;
> +
> + if ((cur_mode != EMC_CFG5_QUSE_MODE_PULSE_INTERN &&
> + cur_mode != EMC_CFG5_QUSE_MODE_INTERNAL_LPBK) ||
> + (new_mode != EMC_CFG5_QUSE_MODE_PULSE_INTERN &&
> + new_mode != EMC_CFG5_QUSE_MODE_INTERNAL_LPBK))
> + qrst_used = true;
> + }
> +
> + /* flow control marker 1 */
> + writel_relaxed(0x1, emc->regs + EMC_STALL_THEN_EXE_BEFORE_CLKCHANGE);
> +
> + /* enable periodic reset */
> + if (qrst_used) {
> + writel_relaxed(emc_dbg | EMC_DBG_WRITE_MUX_ACTIVE,
> + emc->regs + EMC_DBG);
> + writel_relaxed(emc->emc_cfg | EMC_CFG_PERIODIC_QRST,
> + emc->regs + EMC_CFG);
> + writel_relaxed(emc_dbg, emc->regs + EMC_DBG);
> + }
> +
> + /* disable auto-refresh to save time after clock change */
> + writel_relaxed(EMC_REFCTRL_DISABLE_ALL(dram_num),
> + emc->regs + EMC_REFCTRL);
> +
> + /* turn off DLL and enter self-refresh on DDR3 */
> + if (dram_type == DRAM_TYPE_DDR3) {
> + if (dll_change == DLL_CHANGE_OFF)
> + writel_relaxed(timing->emc_mode_1,
> + emc->regs + EMC_EMRS);
> +
> + writel_relaxed(DRAM_BROADCAST(dram_num) |
> + EMC_SELF_REF_CMD_ENABLED,
> + emc->regs + EMC_SELF_REF);
> + }
> +
> + /* flow control marker 2 */
> + writel_relaxed(0x1, emc->regs + EMC_STALL_THEN_EXE_AFTER_CLKCHANGE);
> +
> + /* enable write-active MUX, update unshadowed pad control */
> + writel_relaxed(emc_dbg | EMC_DBG_WRITE_MUX_ACTIVE, emc->regs + EMC_DBG);
> + writel_relaxed(timing->data[73], emc->regs + EMC_XM2CLKPADCTRL);
> +
> + /* restore periodic QRST and disable write-active MUX */
> + val = !!(emc->emc_cfg & EMC_CFG_PERIODIC_QRST);
> + if (qrst_used || timing->emc_cfg_periodic_qrst != val) {
> + if (timing->emc_cfg_periodic_qrst)
> + emc->emc_cfg |= EMC_CFG_PERIODIC_QRST;
> + else
> + emc->emc_cfg &= ~EMC_CFG_PERIODIC_QRST;
> +
> + writel_relaxed(emc->emc_cfg, emc->regs + EMC_CFG);
> + }
> + writel_relaxed(emc_dbg, emc->regs + EMC_DBG);
> +
> + /* exit self-refresh on DDR3 */
> + if (dram_type == DRAM_TYPE_DDR3)
> + writel_relaxed(DRAM_BROADCAST(dram_num),
> + emc->regs + EMC_SELF_REF);
> +
> + /* set DRAM-mode registers */
> + if (dram_type == DRAM_TYPE_DDR3) {
> + if (timing->emc_mode_1 != emc->emc_mode_1)
> + writel_relaxed(timing->emc_mode_1,
> + emc->regs + EMC_EMRS);
> +
> + if (timing->emc_mode_2 != emc->emc_mode_2)
> + writel_relaxed(timing->emc_mode_2,
> + emc->regs + EMC_EMRS);
> +
> + if (timing->emc_mode_reset != emc->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;
> + }
> + writel_relaxed(val, emc->regs + EMC_MRS);
> + }
> + } else {
> + if (timing->emc_mode_2 != emc->emc_mode_2)
> + writel_relaxed(timing->emc_mode_2,
> + emc->regs + EMC_MRW);
> +
> + if (timing->emc_mode_1 != emc->emc_mode_1)
> + writel_relaxed(timing->emc_mode_1,
> + emc->regs + EMC_MRW);
> + }
> +
> + emc->emc_mode_1 = timing->emc_mode_1;
> + emc->emc_mode_2 = timing->emc_mode_2;
> + emc->emc_mode_reset = timing->emc_mode_reset;
> +
> + /* issue ZCAL command if turning ZCAL on */
> + if (emc->zcal_long) {
> + writel_relaxed(EMC_ZQ_CAL_LONG_CMD_DEV0,
> + emc->regs + EMC_ZQ_CAL);
> +
> + if (dram_num > 1)
> + writel_relaxed(EMC_ZQ_CAL_LONG_CMD_DEV1,
> + emc->regs + EMC_ZQ_CAL);
> + }
> +
> + /* re-enable auto-refresh */
> + writel_relaxed(EMC_REFCTRL_ENABLE_ALL(dram_num),
> + emc->regs + EMC_REFCTRL);
> +
> + /* flow control marker 3 */
> + writel_relaxed(0x1, emc->regs + EMC_UNSTALL_RW_AFTER_CLKCHANGE);
> +
> + reinit_completion(&emc->clk_handshake_complete);
> +
> + /* interrupt can be re-enabled now */
> + enable_irq(emc->irq);
> +
> + emc->bad_state = false;
> + emc->prepared = true;
> +
> + return 0;
> +}
> +
> +static int emc_complete_timing_change(struct tegra_emc *emc,
> + unsigned long rate)
> +{
> + struct emc_timing *timing = emc_find_timing(emc, rate);
> + unsigned long timeout;
> + int ret;
> +
> + timeout = wait_for_completion_timeout(&emc->clk_handshake_complete,
> + msecs_to_jiffies(100));
> + if (timeout == 0) {
> + dev_err(emc->dev, "emc-car handshake failed\n");
> + emc->bad_state = true;
> + return -EIO;
> + }
> +
> + /* restore auto-calibration */
> + if (emc->vref_cal_toggle)
> + writel_relaxed(timing->emc_auto_cal_interval,
> + emc->regs + EMC_AUTO_CAL_INTERVAL);
> +
> + /* restore dynamic self-refresh */
> + if (timing->emc_cfg_dyn_self_ref) {
> + emc->emc_cfg |= EMC_CFG_DYN_SREF_ENABLE;
> + writel_relaxed(emc->emc_cfg, emc->regs + EMC_CFG);
> + }
> +
> + /* set number of clocks to wait after each ZQ command */
> + if (emc->zcal_long)
> + writel_relaxed(timing->emc_zcal_cnt_long,
> + emc->regs + EMC_ZCAL_WAIT_CNT);
> +
> + udelay(2);
> + /* update restored timing */
> + ret = emc_seq_update_timing(emc);
> + if (ret)
> + emc->bad_state = true;
> +
> + /* restore early ACK */
> + mc_writel(emc->mc, emc->mc_override, MC_EMEM_ARB_OVERRIDE);
> +
> + emc->prepared = false;
> +
> + return ret;
> +}
> +
> +static int emc_unprepare_timing_change(struct tegra_emc *emc,
> + unsigned long rate)
> +{
> + if (emc->prepared && !emc->bad_state) {
> + /* shouldn't ever happen in practice */
> + dev_err(emc->dev, "timing configuration can't be reverted\n");
> + emc->bad_state = true;
> + }
> +
> + return 0;
> +}
> +
> +static int emc_clk_change_notify(struct notifier_block *nb,
> + unsigned long msg, void *data)
> +{
> + struct tegra_emc *emc = container_of(nb, struct tegra_emc, clk_nb);
> + struct clk_notifier_data *cnd = data;
> + int err;
> +
> + switch (msg) {
> + case PRE_RATE_CHANGE:
> + err = emc_prepare_timing_change(emc, cnd->new_rate);
> + break;
> +
> + case ABORT_RATE_CHANGE:
> + err = emc_unprepare_timing_change(emc, cnd->old_rate);
> + break;
> +
> + case POST_RATE_CHANGE:
> + err = emc_complete_timing_change(emc, cnd->new_rate);
> + break;
> +
> + default:
> + return NOTIFY_DONE;
> + }
> +
> + return notifier_from_errno(err);
> +}
> +
> +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 %pOF: failed to read rate: %d\n",
> + node, err);
> + return err;
> + }
> +
> + timing->rate = value;
> +
> + err = of_property_read_u32_array(node, "nvidia,emc-configuration",
> + timing->data,
> + ARRAY_SIZE(emc_timing_registers));
> + if (err) {
> + dev_err(emc->dev,
> + "timing %pOF: failed to read emc timing data: %d\n",
> + node, err);
> + return err;
> + }
> +
> +#define EMC_READ_BOOL(prop, dtprop) \
> + timing->prop = of_property_read_bool(node, dtprop);
> +
> +#define EMC_READ_U32(prop, dtprop) \
> + err = of_property_read_u32(node, dtprop, &timing->prop); \
> + if (err) { \
> + dev_err(emc->dev, \
> + "timing %pOFn: failed to read " #prop ": %d\n", \
> + node, err); \
> + return err; \
> + }
> +
> + EMC_READ_U32(emc_auto_cal_interval, "nvidia,emc-auto-cal-interval")
> + EMC_READ_U32(emc_mode_1, "nvidia,emc-mode-1")
> + EMC_READ_U32(emc_mode_2, "nvidia,emc-mode-2")
> + EMC_READ_U32(emc_mode_reset, "nvidia,emc-mode-reset")
> + EMC_READ_U32(emc_zcal_cnt_long, "nvidia,emc-zcal-cnt-long")
> + EMC_READ_BOOL(emc_cfg_dyn_self_ref, "nvidia,emc-cfg-dyn-self-ref")
> + EMC_READ_BOOL(emc_cfg_periodic_qrst, "nvidia,emc-cfg-periodic-qrst")
> +
> +#undef EMC_READ_U32
> +#undef EMC_READ_BOOL
> +
> + dev_dbg(emc->dev, "%s: %pOF: rate %lu\n", __func__, node, timing->rate);
> +
> + 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;
> +
> + if (a->rate > b->rate)
> + return 1;
> +
> + return 0;
> +}
> +
> +static int emc_check_mc_timings(struct tegra_emc *emc)
> +{
> + struct tegra_mc *mc = emc->mc;
> + unsigned int i;
> +
> + if (emc->num_timings != mc->num_timings) {
> + dev_err(emc->dev, "emc/mc timings number mismatch: %u %u\n",
> + emc->num_timings, mc->num_timings);
> + return -EINVAL;
> + }
> +
> + for (i = 0; i < mc->num_timings; i++) {
> + if (emc->timings[i].rate != mc->timings[i].rate) {
> + dev_err(emc->dev,
> + "emc/mc timing rate mismatch: %lu %lu\n",
> + emc->timings[i].rate, mc->timings[i].rate);
> + return -EINVAL;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int emc_load_timings_from_dt(struct tegra_emc *emc,
> + struct device_node *node)
> +{
> + struct device_node *child;
> + struct emc_timing *timing;
> + int child_count;
> + int err;
> +
> + child_count = of_get_child_count(node);
> + if (!child_count) {
> + dev_err(emc->dev, "no memory timings in: %pOF\n", node);
> + return -EINVAL;
> + }
> +
> + emc->timings = devm_kcalloc(emc->dev, child_count, sizeof(*timing),
> + GFP_KERNEL);
> + if (!emc->timings)
> + return -ENOMEM;
> +
> + emc->num_timings = child_count;
> + timing = emc->timings;
> +
> + for_each_child_of_node(node, child) {
> + err = load_one_timing_from_dt(emc, timing++, child);
> + if (err) {
> + of_node_put(child);
> + return err;
> + }
> + }
> +
> + sort(emc->timings, emc->num_timings, sizeof(*timing), cmp_timings,
> + NULL);
> +
> + err = emc_check_mc_timings(emc);
> + if (err)
> + return err;
> +
> + dev_info(emc->dev,
> + "got %u timings for RAM code %u (min %luMHz max %luMHz)\n",
> + emc->num_timings,
> + tegra_read_ram_code(),
> + emc->timings[0].rate / 1000000,
> + emc->timings[emc->num_timings - 1].rate / 1000000);
> +
> + return 0;
> +}
> +
> +static struct device_node *emc_find_node_by_ram_code(struct device *dev)
> +{
> + struct device_node *np;
> + u32 value, ram_code;
> + int err;
> +
> + ram_code = tegra_read_ram_code();
> +
> + for_each_child_of_node(dev->of_node, np) {
> + err = of_property_read_u32(np, "nvidia,ram-code", &value);
> + if (err || value != ram_code)
> + continue;
> +
> + return np;
> + }
> +
> + dev_err(dev, "no memory timings for RAM code %u found in device-tree\n",
> + ram_code);
> +
> + return NULL;
> +}
> +
> +static int emc_setup_hw(struct tegra_emc *emc)
> +{
> + u32 intmask = EMC_REFRESH_OVERFLOW_INT | EMC_CLKCHANGE_COMPLETE_INT;
> + u32 fbio_cfg5, emc_cfg, emc_dbg;
> + enum emc_dram_type dram_type;
> +
> + fbio_cfg5 = readl_relaxed(emc->regs + EMC_FBIO_CFG5);
> + dram_type = fbio_cfg5 & EMC_FBIO_CFG5_DRAM_TYPE_MASK;
> +
> + emc_cfg = readl_relaxed(emc->regs + EMC_CFG_2);
> +
> + /* enable EMC and CAR to handshake on PLL divider/source changes */
> + emc_cfg |= EMC_CLKCHANGE_REQ_ENABLE;
> +
> + /* configure clock change mode accordingly to DRAM type */
> + switch (dram_type) {
> + case DRAM_TYPE_LPDDR2:
> + emc_cfg |= EMC_CLKCHANGE_PD_ENABLE;
> + emc_cfg &= ~EMC_CLKCHANGE_SR_ENABLE;
> + break;
> +
> + default:
> + emc_cfg &= ~EMC_CLKCHANGE_SR_ENABLE;
> + emc_cfg &= ~EMC_CLKCHANGE_PD_ENABLE;
> + break;
> + }
> +
> + writel_relaxed(emc_cfg, emc->regs + EMC_CFG_2);
> +
> + /* initialize interrupt */
> + writel_relaxed(intmask, emc->regs + EMC_INTMASK);
> + writel_relaxed(0xffffffff, emc->regs + EMC_INTSTATUS);
> +
> + /* ensure that unwanted debug features are disabled */
> + emc_dbg = readl_relaxed(emc->regs + EMC_DBG);
> + emc_dbg |= EMC_DBG_CFG_PRIORITY;
> + emc_dbg &= ~EMC_DBG_READ_MUX_ASSEMBLY;
> + emc_dbg &= ~EMC_DBG_WRITE_MUX_ACTIVE;
> + emc_dbg &= ~EMC_DBG_FORCE_UPDATE;
> + writel_relaxed(emc_dbg, emc->regs + EMC_DBG);
> +
> + return 0;
> +}
> +
> +static long emc_round_rate(unsigned long rate,
> + unsigned long min_rate,
> + unsigned long max_rate,
> + void *arg)
> +{
> + struct emc_timing *timing = NULL;
> + struct tegra_emc *emc = arg;
> + unsigned int i;
> +
> + min_rate = min(min_rate, emc->timings[emc->num_timings - 1].rate);
> +
> + for (i = 0; i < emc->num_timings; i++) {
> + if (emc->timings[i].rate < rate && i != emc->num_timings - 1)
> + continue;
> +
> + if (emc->timings[i].rate > max_rate) {
> + i = max(i, 1u) - 1;
> +
> + if (emc->timings[i].rate < min_rate)
> + break;
> + }
> +
> + if (emc->timings[i].rate < min_rate)
> + continue;
> +
> + timing = &emc->timings[i];
> + break;
> + }
> +
> + if (!timing) {
> + dev_err(emc->dev, "no timing for rate %lu min %lu max %lu\n",
> + rate, min_rate, max_rate);
> + return -EINVAL;
> + }
> +
> + return timing->rate;
> +}
> +
> +static int tegra_emc_probe(struct platform_device *pdev)
> +{
> + struct platform_device *mc;
> + struct device_node *np;
> + struct tegra_emc *emc;
> + int err;
> +
> + if (of_get_child_count(pdev->dev.of_node) == 0) {
> + dev_info(&pdev->dev,
> + "device-tree node doesn't have memory timings\n");
> + return 0;
> + }
> +
> + np = of_parse_phandle(pdev->dev.of_node, "nvidia,memory-controller", 0);
> + if (!np) {
> + dev_err(&pdev->dev, "could not get memory controller node\n");
> + return -ENOENT;
> + }
> +
> + mc = of_find_device_by_node(np);
> + of_node_put(np);
> + if (!mc)
> + return -ENOENT;
> +
> + np = emc_find_node_by_ram_code(&pdev->dev);
> + if (!np)
> + return -EINVAL;
> +
> + emc = devm_kzalloc(&pdev->dev, sizeof(*emc), GFP_KERNEL);
> + if (!emc) {
> + of_node_put(np);
> + return -ENOMEM;
> + }
> +
> + emc->mc = platform_get_drvdata(mc);
> + if (!emc->mc)
> + return -EPROBE_DEFER;
> +
> + init_completion(&emc->clk_handshake_complete);
> + emc->clk_nb.notifier_call = emc_clk_change_notify;
> + emc->dev = &pdev->dev;
> +
> + err = emc_load_timings_from_dt(emc, np);
> + of_node_put(np);
> + if (err)
> + return err;
> +
> + emc->regs = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(emc->regs))
> + return PTR_ERR(emc->regs);
> +
> + err = emc_setup_hw(emc);
> + if (err)
> + return err;
> +
> + err = platform_get_irq(pdev, 0);
> + if (err < 0) {
> + dev_err(&pdev->dev, "interrupt not specified: %d\n", err);
> + return err;
> + }
> + emc->irq = err;
> +
> + err = devm_request_irq(&pdev->dev, emc->irq, tegra_emc_isr, 0,
> + dev_name(&pdev->dev), emc);
> + if (err) {
> + dev_err(&pdev->dev, "failed to request irq: %d\n", err);
> + return err;
> + }
> +
> + tegra20_clk_set_emc_round_callback(emc_round_rate, emc);
> +
> + emc->clk = devm_clk_get(&pdev->dev, "emc");
> + if (IS_ERR(emc->clk)) {
> + err = PTR_ERR(emc->clk);
> + dev_err(&pdev->dev, "failed to get emc clock: %d\n", err);
> + goto unset_cb;
> + }
> +
> + err = clk_notifier_register(emc->clk, &emc->clk_nb);
> + if (err) {
> + dev_err(&pdev->dev, "failed to register clk notifier: %d\n",
> + err);
> + goto unset_cb;
> + }
> +
> + platform_set_drvdata(pdev, emc);
> +
> + return 0;
> +
> +unset_cb:
> + tegra20_clk_set_emc_round_callback(NULL, NULL);
> +
> + return err;
> +}
> +
> +static int tegra_emc_suspend(struct device *dev)
> +{
> + struct tegra_emc *emc = dev_get_drvdata(dev);
> +
> + /*
> + * Suspending in a bad state will hang machine. The "prepared" var
> + * shall be always false here unless it's a kernel bug that caused
> + * suspending in a wrong order.
> + */
> + if (WARN_ON(emc->prepared) || emc->bad_state)
> + return -EINVAL;
> +
> + emc->bad_state = true;
> +
> + return 0;
> +}
> +
> +static int tegra_emc_resume(struct device *dev)
> +{
> + struct tegra_emc *emc = dev_get_drvdata(dev);
> +
> + emc_setup_hw(emc);
> + emc->bad_state = false;
> +
> + return 0;
> +}
> +
> +static const struct dev_pm_ops tegra_emc_pm_ops = {
> + .suspend = tegra_emc_suspend,
> + .resume = tegra_emc_resume,
> +};
> +
> +static const struct of_device_id tegra_emc_of_match[] = {
> + { .compatible = "nvidia,tegra30-emc", },
> + {},
> +};
> +
> +static struct platform_driver tegra_emc_driver = {
> + .probe = tegra_emc_probe,
> + .driver = {
> + .name = "tegra30-emc",
> + .of_match_table = tegra_emc_of_match,
> + .pm = &tegra_emc_pm_ops,
> + .suppress_bind_attrs = true,
> + },
> +};
> +
> +static int __init tegra_emc_init(void)
> +{
> + return platform_driver_register(&tegra_emc_driver);
> +}
> +subsys_initcall(tegra_emc_init);
> diff --git a/drivers/memory/tegra/tegra30.c b/drivers/memory/tegra/tegra30.c
> index 14788fc2f9e8..b1226d3f067f 100644
> --- a/drivers/memory/tegra/tegra30.c
> +++ b/drivers/memory/tegra/tegra30.c
> @@ -10,6 +10,46 @@
>
> #include "mc.h"
>
> +#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_RING1_THROTTLE 0xe0
> +
> +static const unsigned long tegra30_mc_emem_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_RING1_THROTTLE,
> +};
> +
> static const struct tegra_mc_client tegra30_mc_clients[] = {
> {
> .id = 0x00,
> @@ -994,6 +1034,8 @@ const struct tegra_mc_soc tegra30_mc_soc = {
> .atom_size = 16,
> .client_id_mask = 0x7f,
> .smmu = &tegra30_smmu_soc,
> + .emem_regs = tegra30_mc_emem_regs,
> + .num_emem_regs = ARRAY_SIZE(tegra30_mc_emem_regs),
> .intmask = MC_INT_INVALID_SMMU_PAGE | MC_INT_SECURITY_VIOLATION |
> MC_INT_DECERR_EMEM,
> .reset_ops = &tegra_mc_reset_ops_common,
> diff --git a/include/soc/tegra/mc.h b/include/soc/tegra/mc.h
> index 16e2c2fb5f6c..1238e35653d1 100644
> --- a/include/soc/tegra/mc.h
> +++ b/include/soc/tegra/mc.h
> @@ -181,7 +181,7 @@ struct tegra_mc {
> spinlock_t lock;
> };
>
> -void tegra_mc_write_emem_configuration(struct tegra_mc *mc, unsigned long rate);
> +int tegra_mc_write_emem_configuration(struct tegra_mc *mc, unsigned long rate);
> unsigned int tegra_mc_get_emem_device_count(struct tegra_mc *mc);
>
> #endif /* __SOC_TEGRA_MC_H__ */
> --
> 2.22.0
>