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Date: Thu, 6 Nov 2014 16:56:26 +0900
From: Alexandre Courbot <acourbot@...dia.com>
To: Tomeu Vizoso <tomeu.vizoso@...labora.com>,
<linux-tegra@...r.kernel.org>
CC: Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
"Mikko Perttunen" <mperttunen@...dia.com>,
Stephen Warren <swarren@...dotorg.org>,
Thierry Reding <thierry.reding@...il.com>,
Alexandre Courbot <gnurou@...il.com>,
Grant Likely <grant.likely@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Paul Gortmaker" <paul.gortmaker@...driver.com>,
Maxime Ripard <maxime.ripard@...e-electrons.com>,
Nicolas Ferre <nicolas.ferre@...el.com>,
Ivan Khoronzhuk <ivan.khoronzhuk@...com>,
Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
Scott Wood <scottwood@...escale.com>,
Bharat Bhushan <bharat.bhushan@...escale.com>,
Santosh Shilimkar <santosh.shilimkar@...com>,
Prabhakar Kushwaha <prabhakar@...escale.com>,
<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 10/13] memory: tegra: Add EMC (external memory controller)
driver
On 10/30/2014 01:22 AM, Tomeu Vizoso wrote:
> From: Mikko Perttunen <mperttunen@...dia.com>
>
> Implements functionality needed to change the rate of the memory bus clock.
>
> Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
>
> ---
>
> v2: * Use subsys_initcall(), so it gets probed after the MC driver and
> before the CAR driver
> ---
> drivers/memory/Kconfig | 10 +
> drivers/memory/Makefile | 1 -
> drivers/memory/tegra/Makefile | 1 +
> drivers/memory/tegra/tegra124-emc.c | 1133 +++++++++++++++++++++++++++++++++++
> include/soc/tegra/memory.h | 2 +
> 5 files changed, 1146 insertions(+), 1 deletion(-)
> create mode 100644 drivers/memory/tegra/tegra124-emc.c
>
> diff --git a/drivers/memory/Kconfig b/drivers/memory/Kconfig
> index 6d91c27..3ba3aef 100644
> --- a/drivers/memory/Kconfig
> +++ b/drivers/memory/Kconfig
> @@ -51,6 +51,16 @@ config MVEBU_DEVBUS
> Armada 370 and Armada XP. This controller allows to handle flash
> devices such as NOR, NAND, SRAM, and FPGA.
>
> +config TEGRA124_EMC
> + bool "Tegra124 External Memory Controller driver"
> + default y
> + depends on 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.
> +
> config TEGRA20_MC
> bool "Tegra20 Memory Controller(MC) driver"
> default y
> diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile
> index 1c932e7..8e5ec8d 100644
> --- a/drivers/memory/Makefile
> +++ b/drivers/memory/Makefile
> @@ -12,5 +12,4 @@ obj-$(CONFIG_FSL_CORENET_CF) += fsl-corenet-cf.o
> obj-$(CONFIG_FSL_IFC) += fsl_ifc.o
> obj-$(CONFIG_MVEBU_DEVBUS) += mvebu-devbus.o
> obj-$(CONFIG_TEGRA20_MC) += tegra20-mc.o
> -
> obj-$(CONFIG_ARCH_TEGRA) += tegra/
> diff --git a/drivers/memory/tegra/Makefile b/drivers/memory/tegra/Makefile
> index 51b9e8f..4e84bef 100644
> --- a/drivers/memory/tegra/Makefile
> +++ b/drivers/memory/tegra/Makefile
> @@ -3,3 +3,4 @@ obj-$(CONFIG_ARCH_TEGRA_3x_SOC) += tegra30-mc.o
> obj-$(CONFIG_ARCH_TEGRA_114_SOC) += tegra114-mc.o
> obj-$(CONFIG_ARCH_TEGRA_124_SOC) += tegra124-mc.o
> obj-$(CONFIG_ARCH_TEGRA_132_SOC) += tegra124-mc.o
> +obj-$(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 0000000..8438de2
> --- /dev/null
> +++ b/drivers/memory/tegra/tegra124-emc.c
> @@ -0,0 +1,1133 @@
> +/*
> + * drivers/memory/tegra124-emc.c
> + *
> + * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
> + *
> + * Author:
> + * Mikko Perttunen <mperttunen@...dia.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/module.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/fuse.h>
> +#include <soc/tegra/memory.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)
> +
> +#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
> +};
> +
> +struct emc_timing {
> + unsigned long rate;
> +
> + /* 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.
> + */
nit: Comment style.
> + 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 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 tegra_mc *mc;
> +
> + void __iomem *emc_regs;
> +
> + enum emc_dram_type dram_type;
> + u8 dram_num;
> +
> + struct emc_timing last_timing;
> + struct emc_timing *timings;
> + unsigned int num_timings;
> +
> + bool changing_timing;
This field is just set to false once, and then never touched anywhere -
is it needed at all?
> +};
> +
> +/* * * * * * * * * * * * * * * * * * * * * * * * * *
> + * 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");
> +}
> +
> +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");
> +}
> +
> +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");
> +}
> +
> +static void emc_prepare_timing_change(struct tegra_emc *tegra,
> + const struct emc_timing *timing)
> +{
> + u32 val, val2;
> + bool update = false;
> + int pre_wait = 0;
> + int i;
> + enum emc_dll_change dll_change;
> +
> + 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]);
> +
> + tegra_mc_write_emem_configuration(tegra->mc, timing->rate);
> +
> + 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 register to wait until programming has settled */
> +
> + readl(tegra->emc_regs + EMC_INTSTATUS);
> +}
> +
> +static void emc_complete_timing_change(struct tegra_emc *tegra,
> + const struct emc_timing *timing)
> +{
> + u32 val;
> +
> + /* 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);
> +
> + tegra->last_timing = *timing;
> +}
> +
> +/* * * * * * * * * * * * * * * * * * * * * * * * * *
> + * 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]);
> +
> + 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 int emc_init(struct tegra_emc *tegra)
> +{
> + tegra->dram_type = readl(tegra->emc_regs + EMC_FBIO_CFG5);
> + tegra->dram_type &= EMC_FBIO_CFG5_DRAM_TYPE_MASK;
> + tegra->dram_type >>= EMC_FBIO_CFG5_DRAM_TYPE_SHIFT;
> +
> + tegra->dram_num = tegra_mc_get_emem_device_count(tegra->mc);
> +
> + emc_read_current_timing(tegra, &tegra->last_timing);
> +
> + tegra->changing_timing = false;
> +
> + return 0;
> +}
> +
> +static int load_one_timing_from_dt(struct tegra_emc *tegra,
> + struct emc_timing *timing,
> + struct device_node *node)
> +{
> + int err;
> + 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_array(node, "nvidia,emc-configuration",
> + 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;
> + }
> +
> +#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; \
> + } \
> +}
Let's make this static inline and let the compiler decide whether it is
worth expanding it 14 times.
> +
> + 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
> +
> + 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 load_timings_from_dt(struct tegra_emc *tegra,
> + struct device_node *node)
> +{
> + struct device_node *child;
> + int child_count = of_get_child_count(node);
> + 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;
> + }
> +
> + sort(tegra->timings, tegra->num_timings, sizeof(struct emc_timing),
> + cmp_timings, NULL);
> +
> + 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 struct tegra_emc *emc_instance;
> +
> +void tegra_emc_prepare_timing_change(unsigned long rate)
> +{
> + int i;
> +
> + if (!emc_instance)
> + return;
> +
> + for (i = 0; i < emc_instance->num_timings; ++i) {
> + if (emc_instance->timings[i].rate == rate)
> + break;
> + }
> +
> + if (i == emc_instance->num_timings)
> + return;
Same comment as previous patch - we should probably report this one way
or the other.
> +
> + emc_prepare_timing_change(emc_instance, emc_instance->timings + i);
> +}
> +
> +void tegra_emc_complete_timing_change(unsigned long rate)
> +{
> + int i;
> +
> + if (!emc_instance)
> + return;
> +
> + for (i = 0; i < emc_instance->num_timings; ++i) {
> + if (emc_instance->timings[i].rate == rate)
> + break;
> + }
> +
> + if (i == emc_instance->num_timings)
> + return;
Same here.
> +
> + emc_complete_timing_change(emc_instance, emc_instance->timings + i);
> +}
> +
> +static int tegra_emc_probe(struct platform_device *pdev)
> +{
> + struct tegra_emc *tegra;
> + struct device_node *node;
> + struct platform_device *mc_pdev;
> + struct resource *res;
> + u32 ram_code, node_ram_code;
> + 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_parse_phandle(pdev->dev.of_node,
> + "nvidia,memory-controller", 0);
> + if (!node) {
> + dev_err(&pdev->dev, "could not get memory controller\n");
> + return -ENOENT;
> + }
> +
> + mc_pdev = of_find_device_by_node(node);
> + if (!mc_pdev)
> + return -ENOENT;
Isn't there a risk that we will return -ENOENT depending on the probe
order? I.e. if this device is probed before the MC device?
> +
> + tegra->mc = platform_get_drvdata(mc_pdev);
> + if (!tegra->mc)
> + return -ENOENT;
> +
> + of_node_put(node);
> +
> + ram_code = tegra_read_ram_code();
> +
> + tegra->num_timings = 0;
> +
> + for_each_child_of_node(pdev->dev.of_node, node) {
> + if (strcmp(node->name, "timings"))
> + continue;
> +
> + err = of_property_read_u32(node, "nvidia,ram-code",
> + &node_ram_code);
> + if (err) {
> + dev_warn(&pdev->dev,
> + "skipping timing without ram-code\n");
> + continue;
> + }
> +
> + if (node_ram_code != ram_code)
> + continue;
> +
> + err = load_timings_from_dt(tegra, node);
> + if (err)
> + return err;
> + break;
> + }
> +
> + if (tegra->num_timings == 0)
> + dev_warn(&pdev->dev, "no memory timings registered\n");
> +
> + err = emc_init(tegra);
> + if (err) {
> + dev_err(&pdev->dev, "initialization failed: %d\n", err);
> + return err;
> + }
> +
> + platform_set_drvdata(pdev, tegra);
> +
> + emc_instance = tegra;
> +
> + return 0;
> +};
> +
> +static struct platform_driver tegra_emc_driver = {
> + .probe = tegra_emc_probe,
> + .driver = {
> + .name = "tegra-emc",
> + .of_match_table = tegra_emc_of_match,
> + },
> +};
> +
> +static int tegra_emc_init(void)
> +{
> + return platform_driver_register(&tegra_emc_driver);
> +}
> +subsys_initcall(tegra_emc_init);
> +
> +MODULE_AUTHOR("Mikko Perttunen <mperttunen@...dia.com>");
> +MODULE_DESCRIPTION("Tegra124 EMC memory driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/soc/tegra/memory.h b/include/soc/tegra/memory.h
> index f307516..0e0a2e9 100644
> --- a/include/soc/tegra/memory.h
> +++ b/include/soc/tegra/memory.h
> @@ -13,5 +13,7 @@ struct tegra_mc;
>
> void tegra_mc_write_emem_configuration(struct tegra_mc *mc, unsigned long rate);
> int tegra_mc_get_emem_device_count(struct tegra_mc *mc);
> +void tegra_emc_prepare_timing_change(unsigned long rate);
> +void tegra_emc_complete_timing_change(unsigned long rate);
>
> #endif /* __SOC_TEGRA_MEMORY_H__ */
>
--
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