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Message-ID: <CALHRZurBk6mRFcGXhYHvdAsU0uarGS1Zrkpg96grnZd41PJJ5Q@mail.gmail.com>
Date: Thu, 1 Nov 2018 22:31:19 +0530
From: sundeep subbaraya <sundeep.lkml@...il.com>
To: anurag.kumar.vulisha@...inx.com
Cc: kishon@...com, michal.simek@...inx.com, robh+dt@...nel.org,
Mark Rutland <mark.rutland@....com>,
vivek.gautam@...eaurora.org, v.anuragkumar@...il.com,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
devicetree@...r.kernel.org
Subject: Re: [PATCH v3 1/2] phy: zynqmp: Add phy driver for xilinx zynqmp phy core
Hi Anurag,
On Wed, Sep 5, 2018 at 10:14 PM Anurag Kumar Vulisha
<anurag.kumar.vulisha@...inx.com> wrote:
>
> ZynqMP SoC has a Gigabit Transceiver with four lanes. All the high speed
> peripherals such as USB, SATA, PCIE, Display Port and Ethernet SGMII can
> rely on any of the four GT lanes for PHY layer. This patch adds driver
> for that ZynqMP GT core.
>
> Signed-off-by: Anurag Kumar Vulisha <anurag.kumar.vulisha@...inx.com>
> ---
> Changes in v3:
> 1. Corrected the Documentation as suggested by Vivek Gautam
>
> Changes in v2:
> 1. Fixed the compilation error when compiled phy-zynqmp.c as a module
> 2. Added CONFIG_PM macro in phy-zynqmp.c driver
> ---
> drivers/phy/Kconfig | 8 +
> drivers/phy/Makefile | 1 +
> drivers/phy/phy-zynqmp.c | 1581 ++++++++++++++++++++++++++++++++++++++++
> include/dt-bindings/phy/phy.h | 2 +
> include/linux/phy/phy-zynqmp.h | 52 ++
> 5 files changed, 1644 insertions(+)
> create mode 100644 drivers/phy/phy-zynqmp.c
> create mode 100644 include/linux/phy/phy-zynqmp.h
>
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index 5c8d452..14cf3330 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -40,6 +40,14 @@ config PHY_XGENE
> help
> This option enables support for APM X-Gene SoC multi-purpose PHY.
>
> +config PHY_XILINX_ZYNQMP
> + tristate "Xilinx ZynqMP PHY driver"
> + depends on ARCH_ZYNQMP
> + select GENERIC_PHY
> + help
> + Enable this to support ZynqMP High Speed Gigabit Transceiver
> + that is part of ZynqMP SoC.
> +
> source "drivers/phy/allwinner/Kconfig"
> source "drivers/phy/amlogic/Kconfig"
> source "drivers/phy/broadcom/Kconfig"
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index 84e3bd9..f2a8d27 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -7,6 +7,7 @@ obj-$(CONFIG_GENERIC_PHY) += phy-core.o
> obj-$(CONFIG_PHY_LPC18XX_USB_OTG) += phy-lpc18xx-usb-otg.o
> obj-$(CONFIG_PHY_XGENE) += phy-xgene.o
> obj-$(CONFIG_PHY_PISTACHIO_USB) += phy-pistachio-usb.o
> +obj-$(CONFIG_PHY_XILINX_ZYNQMP) += phy-zynqmp.o
> obj-$(CONFIG_ARCH_SUNXI) += allwinner/
> obj-$(CONFIG_ARCH_MESON) += amlogic/
> obj-$(CONFIG_LANTIQ) += lantiq/
> diff --git a/drivers/phy/phy-zynqmp.c b/drivers/phy/phy-zynqmp.c
> new file mode 100644
> index 0000000..84efc3d
> --- /dev/null
> +++ b/drivers/phy/phy-zynqmp.c
> @@ -0,0 +1,1581 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * phy-zynqmp.c - PHY driver for Xilinx ZynqMP GT.
> + *
> + * Copyright (C) 2018 Xilinx Inc.
> + *
> + * Author: Anurag Kumar Vulisha <anuragku@...inx.com>
This driver was initially written by me and sent for review till v2:
https://lore.kernel.org/patchwork/patch/635317/
I remember there was no support for reset that time and could not
test DP.
I guess you should add my name too.
Subbaraya Sundeep <sundeep.lkml@...il.com>.
Thanks,
Sundeep
> + *
> + * This driver is tested for USB, SATA and Display Port currently.
> + * Other controllers PCIe and SGMII should also work but that is
> + * experimental as of now.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <linux/of_address.h>
> +#include <linux/phy/phy.h>
> +#include <linux/phy/phy-zynqmp.h>
> +#include <linux/platform_device.h>
> +#include <linux/delay.h>
> +#include <dt-bindings/phy/phy.h>
> +#include <linux/reset.h>
> +#include <linux/list.h>
> +#include <linux/slab.h>
> +
> +/* Inter Connect Matrix parameters */
> +#define ICM_CFG0 0x10010
> +#define ICM_CFG1 0x10014
> +#define ICM_CFG0_L0_MASK 0x07
> +#define ICM_CFG0_L1_MASK 0x70
> +#define ICM_CFG1_L2_MASK 0x07
> +#define ICM_CFG2_L3_MASK 0x70
> +#define ICM_CFG_SHIFT 4
> +
> +/* Inter Connect Matrix allowed protocols */
> +#define ICM_PROTOCOL_PD 0x0
> +#define ICM_PROTOCOL_PCIE 0x1
> +#define ICM_PROTOCOL_SATA 0x2
> +#define ICM_PROTOCOL_USB 0x3
> +#define ICM_PROTOCOL_DP 0x4
> +#define ICM_PROTOCOL_SGMII 0x5
> +
> +/* Test Mode common reset control parameters */
> +#define TM_CMN_RST 0x10018
> +#define TM_CMN_RST_EN 0x1
> +#define TM_CMN_RST_SET 0x2
> +#define TM_CMN_RST_MASK 0x3
> +
> +/* Refclk selection parameters */
> +#define PLL_REF_SEL0 0x10000
> +#define PLL_REF_OFFSET 0x4
> +#define PLL_FREQ_MASK 0x1F
> +#define PLL_STATUS_READ_OFFSET 0x4000
> +#define PLL_STATUS_LOCKED 0x10
> +
> +/* PLL SSC step size offsets */
> +#define L0_L0_REF_CLK_SEL 0x2860
> +#define L0_PLL_SS_STEPS_0_LSB 0x2368
> +#define L0_PLL_SS_STEPS_1_MSB 0x236C
> +#define L0_PLL_SS_STEP_SIZE_0_LSB 0x2370
> +#define L0_PLL_SS_STEP_SIZE_1 0x2374
> +#define L0_PLL_SS_STEP_SIZE_2 0x2378
> +#define L0_PLL_SS_STEP_SIZE_3_MSB 0x237C
> +#define L0_PLL_STATUS_READ_1 0x23E4
> +
> +/* SSC step size parameters */
> +#define STEP_SIZE_OFFSET 0x4000
> +#define STEP_SIZE_0_MASK 0xFF
> +#define STEP_SIZE_1_MASK 0xFF
> +#define STEP_SIZE_2_MASK 0xFF
> +#define STEP_SIZE_3_MASK 0x3
> +#define STEP_SIZE_SHIFT 8
> +#define FORCE_STEP_SIZE 0x10
> +#define FORCE_STEPS 0x20
> +#define STEPS_OFFSET 0x4000
> +#define STEPS_0_MASK 0xFF
> +#define STEPS_1_MASK 0x07
> +
> +/* BG calibration parameters */
> +#define BGCAL_REF_SEL 0x10028
> +#define BGCAL_REF_VALUE 0x0C
> +
> +/* Calibration digital logic parameters */
> +#define L3_TM_CALIB_DIG19 0xEC4C
> +#define L3_CALIB_DONE_STATUS 0xEF14
> +#define L3_TM_CALIB_DIG18 0xEC48
> +#define L3_TM_CALIB_DIG19_NSW 0x07
> +#define L3_TM_CALIB_DIG18_NSW 0xE0
> +#define L3_TM_OVERRIDE_NSW_CODE 0x20
> +#define L3_CALIB_DONE 0x02
> +#define L3_NSW_SHIFT 5
> +#define L3_NSW_PIPE_SHIFT 4
> +#define L3_NSW_CALIB_SHIFT 3
> +
> +/* DN Resistor calibration code parameters */
> +#define L0_TXPMA_ST_3 0x0B0C
> +#define L0_DN_CALIB_CODE 0x3F
> +
> +/* PLL Test Mode register parameters */
> +#define L0_TM_PLL_DIG_37 0x2094
> +#define L0_TM_PLL_DIG_37_OFFSET 0x4000
> +#define L0_TM_COARSE_CODE_LIMIT 0x10
> +
> +/* PCS control parameters */
> +#define L0_TM_DIG_6 0x106C
> +#define L0_TX_DIG_61 0x00F4
> +#define L0_TM_DIG_6_OFFSET 0x4000
> +#define L0_TX_DIG_61_OFFSET 0x4000
> +#define L0_TM_DIS_DESCRAMBLE_DECODER 0x0F
> +#define L0_TM_DISABLE_SCRAMBLE_ENCODER 0x0F
> +
> +/* TX De-emphasis parameters */
> +#define L0_TX_ANA_TM_18 0x0048
> +#define L0_TX_ANA_TM_118 0x01D8
> +#define L0_TX_ANA_TM_18_OFFSET 0x4000
> +#define L0_TX_ANA_TM_118_OFFSET 0x4000
> +#define L0_TX_ANA_TM_118_FORCE_17_0 BIT(0)
> +
> +/* PMA control parameters */
> +#define L0_TXPMD_TM_45 0x0CB4
> +#define L0_TXPMD_TM_48 0x0CC0
> +#define L0_TXPMD_TM_45_OFFSET 0x4000
> +#define L0_TXPMD_TM_48_OFFSET 0x4000
> +#define L0_TXPMD_TM_45_OVER_DP_MAIN BIT(0)
> +#define L0_TXPMD_TM_45_ENABLE_DP_MAIN BIT(1)
> +#define L0_TXPMD_TM_45_OVER_DP_POST1 BIT(2)
> +#define L0_TXPMD_TM_45_ENABLE_DP_POST1 BIT(3)
> +#define L0_TXPMD_TM_45_OVER_DP_POST2 BIT(4)
> +#define L0_TXPMD_TM_45_ENABLE_DP_POST2 BIT(5)
> +
> +/* Bus width parameters */
> +#define TX_PROT_BUS_WIDTH 0x10040
> +#define RX_PROT_BUS_WIDTH 0x10044
> +#define PROT_BUS_WIDTH_10 0x0
> +#define PROT_BUS_WIDTH_20 0x1
> +#define PROT_BUS_WIDTH_40 0x2
> +#define PROT_BUS_WIDTH_SHIFT 2
> +
> +/* Max number of GT lanes */
> +#define MAX_LANES 4
> +
> +/* Max Allowed refclk frequencies */
> +#define MAX_REFCLK 13
> +
> +/* Lane CLK sharing mask */
> +#define LANE_CLK_SHARE_MASK 0x8F
> +
> +/* SIOU SATA control register */
> +#define SATA_CONTROL_OFFSET 0x0100
> +
> +/* Total number of controllers */
> +#define CONTROLLERS_PER_LANE 5
> +
> +/* USB pipe control parameters */
> +#define PIPE_CLK_OFFSET 0x7c
> +#define PIPE_POWER_OFFSET 0x80
> +#define PIPE_CLK_ON 1
> +#define PIPE_CLK_OFF 0
> +#define PIPE_POWER_ON 1
> +#define PIPE_POWER_OFF 0
> +
> +/* Protocol Type Pparameters */
> +#define XPSGTR_TYPE_USB0 0 /* USB controller 0 */
> +#define XPSGTR_TYPE_USB1 1 /* USB controller 1 */
> +#define XPSGTR_TYPE_SATA_0 2 /* SATA controller lane 0 */
> +#define XPSGTR_TYPE_SATA_1 3 /* SATA controller lane 1 */
> +#define XPSGTR_TYPE_PCIE_0 4 /* PCIe controller lane 0 */
> +#define XPSGTR_TYPE_PCIE_1 5 /* PCIe controller lane 1 */
> +#define XPSGTR_TYPE_PCIE_2 6 /* PCIe controller lane 2 */
> +#define XPSGTR_TYPE_PCIE_3 7 /* PCIe controller lane 3 */
> +#define XPSGTR_TYPE_DP_0 8 /* Display Port controller lane 0 */
> +#define XPSGTR_TYPE_DP_1 9 /* Display Port controller lane 1 */
> +#define XPSGTR_TYPE_SGMII0 10 /* Ethernet SGMII controller 0 */
> +#define XPSGTR_TYPE_SGMII1 11 /* Ethernet SGMII controller 1 */
> +#define XPSGTR_TYPE_SGMII2 12 /* Ethernet SGMII controller 2 */
> +#define XPSGTR_TYPE_SGMII3 13 /* Ethernet SGMII controller 3 */
> +
> +/* Timeout values */
> +#define RST_TIMEOUT_MS 1000
> +#define TIMEOUT_US 1000
> +
> +/*
> + * This table holds the valid combinations of controllers and
> + * lanes(Interconnect Matrix).
> + */
> +static unsigned int icm_matrix[MAX_LANES][CONTROLLERS_PER_LANE] = {
> + { XPSGTR_TYPE_PCIE_0, XPSGTR_TYPE_SATA_0, XPSGTR_TYPE_USB0,
> + XPSGTR_TYPE_DP_1, XPSGTR_TYPE_SGMII0 },
> + { XPSGTR_TYPE_PCIE_1, XPSGTR_TYPE_SATA_1, XPSGTR_TYPE_USB0,
> + XPSGTR_TYPE_DP_0, XPSGTR_TYPE_SGMII1 },
> + { XPSGTR_TYPE_PCIE_2, XPSGTR_TYPE_SATA_0, XPSGTR_TYPE_USB0,
> + XPSGTR_TYPE_DP_1, XPSGTR_TYPE_SGMII2 },
> + { XPSGTR_TYPE_PCIE_3, XPSGTR_TYPE_SATA_1, XPSGTR_TYPE_USB1,
> + XPSGTR_TYPE_DP_0, XPSGTR_TYPE_SGMII3 }
> +};
> +
> +/* Allowed PLL reference clock frequencies */
> +enum pll_frequencies {
> + REF_19_2M = 0,
> + REF_20M,
> + REF_24M,
> + REF_26M,
> + REF_27M,
> + REF_38_4M,
> + REF_40M,
> + REF_52M,
> + REF_100M,
> + REF_108M,
> + REF_125M,
> + REF_135M,
> + REF_150M,
> +};
> +
> +/**
> + * struct xpsgtr_phy - representation of a lane
> + * @phy: pointer to the kernel PHY device
> + * @type: controller which uses this lane
> + * @lane: lane number
> + * @protocol: protocol in which the lane operates
> + * @ref_clk: enum of allowed ref clock rates for this lane PLL
> + * @pll_lock: PLL status
> + * @skip_phy_init: skip phy_init() if true
> + * @data: pointer to hold private data
> + * @refclk_rate: PLL reference clock frequency
> + * @share_laneclk: lane number of the clock to be shared
> + */
> +struct xpsgtr_phy {
> + struct phy *phy;
> + u8 type;
> + u8 lane;
> + u8 protocol;
> + enum pll_frequencies ref_clk;
> + bool pll_lock;
> + bool skip_phy_init;
> + void *data;
> + u32 refclk_rate;
> + u32 share_laneclk;
> +};
> +
> +/**
> + * struct xpsgtr_ssc - structure to hold SSC settings for a lane
> + * @refclk_rate: PLL reference clock frequency
> + * @pll_ref_clk: value to be written to register for corresponding ref clk rate
> + * @steps: number of steps of SSC (Spread Spectrum Clock)
> + * @step_size: step size of each step
> + */
> +struct xpsgtr_ssc {
> + u32 refclk_rate;
> + u8 pll_ref_clk;
> + u32 steps;
> + u32 step_size;
> +};
> +
> +/* lookup table to hold all settings needed for a ref clock frequency */
> +static struct xpsgtr_ssc ssc_lookup[MAX_REFCLK] = {
> + {19200000, 0x05, 608, 264020},
> + {20000000, 0x06, 634, 243454},
> + {24000000, 0x07, 760, 168973},
> + {26000000, 0x08, 824, 143860},
> + {27000000, 0x09, 856, 86551},
> + {38400000, 0x0A, 1218, 65896},
> + {40000000, 0x0B, 634, 243454},
> + {52000000, 0x0C, 824, 143860},
> + {100000000, 0x0D, 1058, 87533},
> + {108000000, 0x0E, 856, 86551},
> + {125000000, 0x0F, 992, 119497},
> + {135000000, 0x10, 1070, 55393},
> + {150000000, 0x11, 792, 187091}
> +};
> +
> +/**
> + * struct xpsgtr_dev - representation of a ZynMP GT device
> + * @dev: pointer to device
> + * @serdes: serdes base address
> + * @siou: siou base address
> + * @gtr_mutex: mutex for locking
> + * @phys: pointer to all the lanes
> + * @tx_term_fix: fix for GT issue
> + * @saved_icm_cfg0: stored value of ICM CFG0 register
> + * @saved_icm_cfg1: stored value of ICM CFG1 register
> + * @sata_rst: a reset control for SATA
> + * @dp_rst: a reset control for DP
> + * @usb0_crst: a reset control for usb0 core
> + * @usb1_crst: a reset control for usb1 core
> + * @usb0_hibrst: a reset control for usb0 hibernation module
> + * @usb1_hibrst: a reset control for usb1 hibernation module
> + * @usb0_apbrst: a reset control for usb0 apb bus
> + * @usb1_apbrst: a reset control for usb1 apb bus
> + * @gem0_rst: a reset control for gem0
> + * @gem1_rst: a reset control for gem1
> + * @gem2_rst: a reset control for gem2
> + * @gem3_rst: a reset control for gem3
> + */
> +struct xpsgtr_dev {
> + struct device *dev;
> + void __iomem *serdes;
> + void __iomem *siou;
> + struct mutex gtr_mutex; /* mutex for locking */
> + struct xpsgtr_phy **phys;
> + bool tx_term_fix;
> + unsigned int saved_icm_cfg0;
> + unsigned int saved_icm_cfg1;
> + struct reset_control *sata_rst;
> + struct reset_control *dp_rst;
> + struct reset_control *usb0_crst;
> + struct reset_control *usb1_crst;
> + struct reset_control *usb0_hibrst;
> + struct reset_control *usb1_hibrst;
> + struct reset_control *usb0_apbrst;
> + struct reset_control *usb1_apbrst;
> + struct reset_control *gem0_rst;
> + struct reset_control *gem1_rst;
> + struct reset_control *gem2_rst;
> + struct reset_control *gem3_rst;
> +};
> +
> +/**
> + * xpsgtr_override_deemph - override PIPE TX de-emphasis
> + * @phy: pointer to phy
> + * @plvl: pre-emphasis level
> + * @vlvl: voltage swing level
> + *
> + * Return: None
> + */
> +void xpsgtr_override_deemph(struct phy *phy, u8 plvl, u8 vlvl)
> +{
> + struct xpsgtr_phy *gtr_phy = phy_get_drvdata(phy);
> + struct xpsgtr_dev *gtr_dev = gtr_phy->data;
> + static u8 pe[4][4] = { { 0x2, 0x2, 0x2, 0x2 },
> + { 0x1, 0x1, 0x1, 0xFF },
> + { 0x0, 0x0, 0xFF, 0xFF },
> + { 0xFF, 0xFF, 0xFF, 0xFF } };
> +
> + writel(pe[plvl][vlvl],
> + gtr_dev->serdes + gtr_phy->lane * L0_TX_ANA_TM_18_OFFSET +
> + L0_TX_ANA_TM_18);
> +}
> +EXPORT_SYMBOL_GPL(xpsgtr_override_deemph);
> +
> +/**
> + * xpsgtr_margining_factor - adjust margining factor value
> + * @phy: pointer to phy
> + * @plvl: pre-emphasis level
> + * @vlvl: voltage swing level
> + *
> + * Return: None
> + */
> +void xpsgtr_margining_factor(struct phy *phy, u8 plvl, u8 vlvl)
> +{
> + struct xpsgtr_phy *gtr_phy = phy_get_drvdata(phy);
> + struct xpsgtr_dev *gtr_dev = gtr_phy->data;
> + static u8 vs[4][4] = { { 0x2a, 0x27, 0x24, 0x20 },
> + { 0x27, 0x23, 0x20, 0xFF },
> + { 0x24, 0x20, 0xFF, 0xFF },
> + { 0xFF, 0xFF, 0xFF, 0xFF } };
> +
> + writel(vs[plvl][vlvl],
> + gtr_dev->serdes + gtr_phy->lane * L0_TXPMD_TM_48_OFFSET +
> + L0_TXPMD_TM_48);
> +}
> +EXPORT_SYMBOL_GPL(xpsgtr_margining_factor);
> +
> +/**
> + * xpsgtr_configure_pll - configures SSC settings for a lane
> + * @gtr_phy: pointer to lane
> + *
> + * Return: None
> + */
> +static void xpsgtr_configure_pll(struct xpsgtr_phy *gtr_phy)
> +{
> + struct xpsgtr_dev *gtr_dev = gtr_phy->data;
> + u32 reg;
> + u32 offset;
> + u32 steps;
> + u32 size;
> + u8 pll_ref_clk;
> +
> + steps = ssc_lookup[gtr_phy->ref_clk].steps;
> + size = ssc_lookup[gtr_phy->ref_clk].step_size;
> + pll_ref_clk = ssc_lookup[gtr_phy->ref_clk].pll_ref_clk;
> +
> + offset = gtr_phy->lane * PLL_REF_OFFSET + PLL_REF_SEL0;
> + reg = readl(gtr_dev->serdes + offset);
> + reg = (reg & ~PLL_FREQ_MASK) | pll_ref_clk;
> + writel(reg, gtr_dev->serdes + offset);
> +
> + /* Enable lane clock sharing, if required */
> + if (gtr_phy->share_laneclk != gtr_phy->lane) {
> + /* Lane3 Ref Clock Selection Register */
> + offset = gtr_phy->lane * PLL_REF_OFFSET + L0_L0_REF_CLK_SEL;
> + reg = readl(gtr_dev->serdes + offset);
> + reg = (reg & ~LANE_CLK_SHARE_MASK) |
> + (1 << gtr_phy->share_laneclk);
> + writel(reg, gtr_dev->serdes + offset);
> + }
> +
> + /* SSC step size [7:0] */
> + offset = gtr_phy->lane * STEP_SIZE_OFFSET + L0_PLL_SS_STEP_SIZE_0_LSB;
> + reg = readl(gtr_dev->serdes + offset);
> + reg = (reg & ~STEP_SIZE_0_MASK) |
> + (size & STEP_SIZE_0_MASK);
> + writel(reg, gtr_dev->serdes + offset);
> +
> + /* SSC step size [15:8] */
> + size = size >> STEP_SIZE_SHIFT;
> + offset = gtr_phy->lane * STEP_SIZE_OFFSET + L0_PLL_SS_STEP_SIZE_1;
> + reg = readl(gtr_dev->serdes + offset);
> + reg = (reg & ~STEP_SIZE_1_MASK) |
> + (size & STEP_SIZE_1_MASK);
> + writel(reg, gtr_dev->serdes + offset);
> +
> + /* SSC step size [23:16] */
> + size = size >> STEP_SIZE_SHIFT;
> + offset = gtr_phy->lane * STEP_SIZE_OFFSET + L0_PLL_SS_STEP_SIZE_2;
> + reg = readl(gtr_dev->serdes + offset);
> + reg = (reg & ~STEP_SIZE_2_MASK) |
> + (size & STEP_SIZE_2_MASK);
> + writel(reg, gtr_dev->serdes + offset);
> +
> + /* SSC steps [7:0] */
> + offset = gtr_phy->lane * STEPS_OFFSET + L0_PLL_SS_STEPS_0_LSB;
> + reg = readl(gtr_dev->serdes + offset);
> + reg = (reg & ~STEPS_0_MASK) |
> + (steps & STEPS_0_MASK);
> + writel(reg, gtr_dev->serdes + offset);
> +
> + /* SSC steps [10:8] */
> + steps = steps >> STEP_SIZE_SHIFT;
> + offset = gtr_phy->lane * STEPS_OFFSET + L0_PLL_SS_STEPS_1_MSB;
> + reg = readl(gtr_dev->serdes + offset);
> + reg = (reg & ~STEPS_1_MASK) |
> + (steps & STEPS_1_MASK);
> + writel(reg, gtr_dev->serdes + offset);
> +
> + /* SSC step size [24:25] */
> + size = size >> STEP_SIZE_SHIFT;
> + offset = gtr_phy->lane * STEP_SIZE_OFFSET + L0_PLL_SS_STEP_SIZE_3_MSB;
> + reg = readl(gtr_dev->serdes + offset);
> + reg = (reg & ~STEP_SIZE_3_MASK) |
> + (size & STEP_SIZE_3_MASK);
> + reg |= FORCE_STEP_SIZE | FORCE_STEPS;
> + writel(reg, gtr_dev->serdes + offset);
> +}
> +
> +/**
> + * xpsgtr_lane_setprotocol - sets required protocol in ICM registers
> + * @gtr_phy: pointer to lane
> + *
> + * Return: None
> + */
> +static void xpsgtr_lane_setprotocol(struct xpsgtr_phy *gtr_phy)
> +{
> + struct xpsgtr_dev *gtr_dev = gtr_phy->data;
> + u32 reg;
> + u8 protocol = gtr_phy->protocol;
> +
> + switch (gtr_phy->lane) {
> + case 0:
> + reg = readl(gtr_dev->serdes + ICM_CFG0);
> + reg = (reg & ~ICM_CFG0_L0_MASK) | protocol;
> + writel(reg, gtr_dev->serdes + ICM_CFG0);
> + break;
> + case 1:
> + reg = readl(gtr_dev->serdes + ICM_CFG0);
> + reg = (reg & ~ICM_CFG0_L1_MASK) | (protocol << ICM_CFG_SHIFT);
> + writel(reg, gtr_dev->serdes + ICM_CFG0);
> + break;
> + case 2:
> + reg = readl(gtr_dev->serdes + ICM_CFG1);
> + reg = (reg & ~ICM_CFG0_L0_MASK) | protocol;
> + writel(reg, gtr_dev->serdes + ICM_CFG1);
> + break;
> + case 3:
> + reg = readl(gtr_dev->serdes + ICM_CFG1);
> + reg = (reg & ~ICM_CFG0_L1_MASK) | (protocol << ICM_CFG_SHIFT);
> + writel(reg, gtr_dev->serdes + ICM_CFG1);
> + break;
> + default:
> + /* We already checked 0 <= lane <= 3 */
> + break;
> + }
> +}
> +
> +/**
> + * xpsgtr_get_ssc - gets the required ssc settings based on clk rate
> + * @gtr_phy: pointer to lane
> + *
> + * Return: 0 on success or error on failure
> + */
> +static int xpsgtr_get_ssc(struct xpsgtr_phy *gtr_phy)
> +{
> + u32 i;
> +
> + /*
> + * Assign the required spread spectrum(SSC) settings
> + * from lane refernce clk rate
> + */
> + for (i = 0 ; i < ARRAY_SIZE(ssc_lookup); i++) {
> + if (gtr_phy->refclk_rate == ssc_lookup[i].refclk_rate) {
> + gtr_phy->ref_clk = i;
> + return 0;
> + }
> + }
> +
> + /* Did not get valid ssc settings*/
> + return -EINVAL;
> +}
> +
> +/**
> + * xpsgtr_configure_lane - configures SSC settings for a lane
> + * @gtr_phy: pointer to lane
> + *
> + * Return: 0 on success or error on failure
> + */
> +static int xpsgtr_configure_lane(struct xpsgtr_phy *gtr_phy)
> +{
> + switch (gtr_phy->type) {
> + case XPSGTR_TYPE_USB0:
> + case XPSGTR_TYPE_USB1:
> + gtr_phy->protocol = ICM_PROTOCOL_USB;
> + break;
> + case XPSGTR_TYPE_SATA_0:
> + case XPSGTR_TYPE_SATA_1:
> + gtr_phy->protocol = ICM_PROTOCOL_SATA;
> + break;
> + case XPSGTR_TYPE_DP_0:
> + case XPSGTR_TYPE_DP_1:
> + gtr_phy->protocol = ICM_PROTOCOL_DP;
> + break;
> + case XPSGTR_TYPE_PCIE_0:
> + case XPSGTR_TYPE_PCIE_1:
> + case XPSGTR_TYPE_PCIE_2:
> + case XPSGTR_TYPE_PCIE_3:
> + gtr_phy->protocol = ICM_PROTOCOL_PCIE;
> + break;
> + case XPSGTR_TYPE_SGMII0:
> + case XPSGTR_TYPE_SGMII1:
> + case XPSGTR_TYPE_SGMII2:
> + case XPSGTR_TYPE_SGMII3:
> + gtr_phy->protocol = ICM_PROTOCOL_SGMII;
> + break;
> + default:
> + gtr_phy->protocol = ICM_PROTOCOL_PD;
> + break;
> + }
> +
> + /* Get SSC settinsg for refernce clk rate */
> + if (xpsgtr_get_ssc(gtr_phy) < 0)
> + return -EINVAL;
> +
> + return 0;
> +}
> +
> +/**
> + * xpsgtr_config_usbpipe - configures the PIPE3 signals for USB
> + * @gtr_phy: pointer to gtr phy device
> + *
> + * Return: None
> + */
> +static void xpsgtr_config_usbpipe(struct xpsgtr_phy *gtr_phy)
> +{
> + struct phy *phy = gtr_phy->phy;
> + struct xpsgtr_dev *gtr_dev = gtr_phy->data;
> + void __iomem *regs = dev_get_platdata(&phy->dev);
> +
> + if (regs) {
> + /* Set PIPE power present signal */
> + writel(PIPE_POWER_ON, regs + PIPE_POWER_OFFSET);
> +
> + /* Clear PIPE CLK signal */
> + writel(PIPE_CLK_OFF, regs + PIPE_CLK_OFFSET);
> + } else {
> + dev_info(gtr_dev->dev,
> + "%s: No valid Platform_data found\n", __func__);
> + }
> +}
> +
> +/**
> + * xpsgtr_reset_assert - asserts reset using reset framework
> + * @rstc: pointer to reset_control
> + *
> + * Return: 0 on success or error on failure
> + */
> +static int xpsgtr_reset_assert(struct reset_control *rstc)
> +{
> + unsigned long loop_time = msecs_to_jiffies(RST_TIMEOUT_MS);
> + unsigned long timeout;
> +
> + reset_control_assert(rstc);
> +
> + /* wait until reset is asserted or timeout */
> + timeout = jiffies + loop_time;
> +
> + while (!time_after_eq(jiffies, timeout)) {
> + if (reset_control_status(rstc) > 0)
> + return 0;
> +
> + cpu_relax();
> + }
> +
> + return -ETIMEDOUT;
> +}
> +
> +/**
> + * xpsgtr_reset_release - de-asserts reset using reset framework
> + * @rstc: pointer to reset_control
> + *
> + * Return: 0 on success or error on failure
> + */
> +static int xpsgtr_reset_release(struct reset_control *rstc)
> +{
> + unsigned long loop_time = msecs_to_jiffies(RST_TIMEOUT_MS);
> + unsigned long timeout;
> +
> + reset_control_deassert(rstc);
> +
> + /* wait until reset is de-asserted or timeout */
> + timeout = jiffies + loop_time;
> + while (!time_after_eq(jiffies, timeout)) {
> + if (!reset_control_status(rstc))
> + return 0;
> +
> + cpu_relax();
> + }
> +
> + return -ETIMEDOUT;
> +}
> +
> +/**
> + * xpsgtr_controller_reset - puts controller in reset
> + * @gtr_phy: pointer to lane
> + *
> + * Return: 0 on success or error on failure
> + */
> +static int xpsgtr_controller_reset(struct xpsgtr_phy *gtr_phy)
> +{
> + struct xpsgtr_dev *gtr_dev = gtr_phy->data;
> + int ret;
> +
> + switch (gtr_phy->type) {
> + case XPSGTR_TYPE_USB0:
> + ret = xpsgtr_reset_assert(gtr_dev->usb0_crst);
> + if (ret != 0)
> + break;
> +
> + ret = xpsgtr_reset_assert(gtr_dev->usb0_hibrst);
> + if (ret != 0)
> + break;
> +
> + ret = xpsgtr_reset_assert(gtr_dev->usb0_apbrst);
> + break;
> + case XPSGTR_TYPE_USB1:
> + ret = xpsgtr_reset_assert(gtr_dev->usb1_crst);
> + if (ret != 0)
> + break;
> +
> + ret = xpsgtr_reset_assert(gtr_dev->usb1_hibrst);
> + if (ret != 0)
> + break;
> +
> + ret = xpsgtr_reset_assert(gtr_dev->usb1_apbrst);
> + break;
> + case XPSGTR_TYPE_SATA_0:
> + case XPSGTR_TYPE_SATA_1:
> + ret = xpsgtr_reset_assert(gtr_dev->sata_rst);
> + break;
> + case XPSGTR_TYPE_DP_0:
> + case XPSGTR_TYPE_DP_1:
> + ret = xpsgtr_reset_assert(gtr_dev->dp_rst);
> + break;
> + case XPSGTR_TYPE_SGMII0:
> + ret = xpsgtr_reset_assert(gtr_dev->gem0_rst);
> + break;
> + case XPSGTR_TYPE_SGMII1:
> + ret = xpsgtr_reset_assert(gtr_dev->gem1_rst);
> + break;
> + case XPSGTR_TYPE_SGMII2:
> + ret = xpsgtr_reset_assert(gtr_dev->gem2_rst);
> + break;
> + case XPSGTR_TYPE_SGMII3:
> + ret = xpsgtr_reset_assert(gtr_dev->gem3_rst);
> + break;
> + default:
> + ret = -EINVAL;
> + break;
> + }
> +
> + return ret;
> +}
> +
> +/**
> + * xpsgtr_controller_release_reset - releases controller from reset
> + * @gtr_phy: pointer to lane
> + *
> + * Return: 0 on success or error on failure
> + */
> +static int xpsgtr_controller_release_reset(struct xpsgtr_phy *gtr_phy)
> +{
> + struct xpsgtr_dev *gtr_dev = gtr_phy->data;
> + int ret;
> +
> + switch (gtr_phy->type) {
> + case XPSGTR_TYPE_USB0:
> + ret = xpsgtr_reset_release(gtr_dev->usb0_apbrst);
> + if (ret != 0)
> + break;
> +
> + /* Config PIPE3 signals after releasing APB reset */
> + xpsgtr_config_usbpipe(gtr_phy);
> +
> + ret = xpsgtr_reset_release(gtr_dev->usb0_crst);
> + if (ret != 0)
> + break;
> +
> + ret = xpsgtr_reset_release(gtr_dev->usb0_hibrst);
> + break;
> + case XPSGTR_TYPE_USB1:
> + ret = xpsgtr_reset_release(gtr_dev->usb1_apbrst);
> + if (ret != 0)
> + break;
> +
> + /* Config PIPE3 signals after releasing APB reset */
> + xpsgtr_config_usbpipe(gtr_phy);
> +
> + ret = xpsgtr_reset_release(gtr_dev->usb1_crst);
> + if (ret != 0)
> + break;
> +
> + ret = xpsgtr_reset_release(gtr_dev->usb1_hibrst);
> + break;
> + case XPSGTR_TYPE_SATA_0:
> + case XPSGTR_TYPE_SATA_1:
> + ret = xpsgtr_reset_release(gtr_dev->sata_rst);
> + break;
> + case XPSGTR_TYPE_DP_0:
> + case XPSGTR_TYPE_DP_1:
> + ret = xpsgtr_reset_release(gtr_dev->dp_rst);
> + break;
> + case XPSGTR_TYPE_SGMII0:
> + ret = xpsgtr_reset_release(gtr_dev->gem0_rst);
> + break;
> + case XPSGTR_TYPE_SGMII1:
> + ret = xpsgtr_reset_release(gtr_dev->gem1_rst);
> + break;
> + case XPSGTR_TYPE_SGMII2:
> + ret = xpsgtr_reset_release(gtr_dev->gem2_rst);
> + break;
> + case XPSGTR_TYPE_SGMII3:
> + ret = xpsgtr_reset_release(gtr_dev->gem3_rst);
> + break;
> + default:
> + ret = -EINVAL;
> + break;
> + }
> +
> + return ret;
> +}
> +
> +/**
> + * xpsgtr_usb_rst_assert - assert USB core reset
> + * @phy: pointer to phy
> + *
> + * Return: 0 on success or error on failure
> + */
> +int xpsgtr_usb_crst_assert(struct phy *phy)
> +{
> + struct xpsgtr_phy *gtr_phy = phy_get_drvdata(phy);
> + struct xpsgtr_dev *gtr_dev = gtr_phy->data;
> + int ret;
> +
> + switch (gtr_phy->type) {
> + case XPSGTR_TYPE_USB0:
> + ret = xpsgtr_reset_assert(gtr_dev->usb0_crst);
> + break;
> + case XPSGTR_TYPE_USB1:
> + ret = xpsgtr_reset_assert(gtr_dev->usb1_crst);
> + break;
> + default:
> + ret = -EINVAL;
> + break;
> + }
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(xpsgtr_usb_crst_assert);
> +
> +/**
> + * xpsgtr_usb_rst_release - release USB core reset
> + * @phy: pointer to phy
> + *
> + * Return: 0 on success or error on failure
> + */
> +int xpsgtr_usb_crst_release(struct phy *phy)
> +{
> + struct xpsgtr_phy *gtr_phy = phy_get_drvdata(phy);
> + struct xpsgtr_dev *gtr_dev = gtr_phy->data;
> + int ret;
> +
> + switch (gtr_phy->type) {
> + case XPSGTR_TYPE_USB0:
> + ret = xpsgtr_reset_release(gtr_dev->usb0_crst);
> + break;
> + case XPSGTR_TYPE_USB1:
> + ret = xpsgtr_reset_release(gtr_dev->usb1_crst);
> + break;
> + default:
> + ret = -EINVAL;
> + break;
> + }
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(xpsgtr_usb_crst_release);
> +
> +/**
> + * xpsgtr_wait_pll_lock - Waits until PLL is locked or timedout
> + * @phy: pointer to phy
> + *
> + * Return: 0 on success or error on failure
> + */
> +int xpsgtr_wait_pll_lock(struct phy *phy)
> +{
> + struct xpsgtr_phy *gtr_phy = phy_get_drvdata(phy);
> + struct xpsgtr_dev *gtr_dev = gtr_phy->data;
> + u32 offset, reg;
> + u32 timeout = TIMEOUT_US;
> + int ret = 0;
> +
> + /* Check pll is locked */
> + offset = gtr_phy->lane * PLL_STATUS_READ_OFFSET + L0_PLL_STATUS_READ_1;
> + dev_dbg(gtr_dev->dev, "Waiting for PLL lock...\n");
> +
> + do {
> + reg = readl(gtr_dev->serdes + offset);
> + if ((reg & PLL_STATUS_LOCKED) == PLL_STATUS_LOCKED)
> + break;
> +
> + if (!--timeout) {
> + dev_err(gtr_dev->dev, "PLL lock time out\n");
> + ret = -ETIMEDOUT;
> + break;
> + }
> +
> + udelay(1);
> + } while (timeout > 0);
> +
> + if (ret == 0)
> + gtr_phy->pll_lock = true;
> +
> + dev_info(gtr_dev->dev, "Lane:%d type:%d protocol:%d pll_locked:%s\n",
> + gtr_phy->lane, gtr_phy->type, gtr_phy->protocol,
> + gtr_phy->pll_lock ? "yes" : "no");
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(xpsgtr_wait_pll_lock);
> +
> +/**
> + * xpsgtr_set_txwidth - This function sets the tx bus width of the lane
> + * @gtr_phy: pointer to lane
> + * @width: tx bus width size
> + *
> + * Return: None
> + */
> +static void xpsgtr_set_txwidth(struct xpsgtr_phy *gtr_phy, u32 width)
> +{
> + struct xpsgtr_dev *gtr_dev = gtr_phy->data;
> +
> + writel(gtr_phy->lane * PROT_BUS_WIDTH_SHIFT >> width,
> + gtr_dev->serdes + TX_PROT_BUS_WIDTH);
> +}
> +
> +/**
> + * xpsgtr_set_rxwidth - This function sets the rx bus width of the lane
> + * @gtr_phy: pointer to lane
> + * @width: rx bus width size
> + *
> + * Return: None
> + */
> +static void xpsgtr_set_rxwidth(struct xpsgtr_phy *gtr_phy, u32 width)
> +{
> + struct xpsgtr_dev *gtr_dev = gtr_phy->data;
> +
> + writel(gtr_phy->lane * PROT_BUS_WIDTH_SHIFT >> width,
> + gtr_dev->serdes + RX_PROT_BUS_WIDTH);
> +}
> +
> +/**
> + * xpsgtr_bypass_scramenc - This bypasses scrambler and 8b/10b encoder feature
> + * @gtr_phy: pointer to lane
> + *
> + * Return: None
> + */
> +static void xpsgtr_bypass_scramenc(struct xpsgtr_phy *gtr_phy)
> +{
> + u32 offset;
> + struct xpsgtr_dev *gtr_dev = gtr_phy->data;
> +
> + /* bypass Scrambler and 8b/10b Encoder */
> + offset = gtr_phy->lane * L0_TX_DIG_61_OFFSET + L0_TX_DIG_61;
> + writel(L0_TM_DISABLE_SCRAMBLE_ENCODER, gtr_dev->serdes + offset);
> +}
> +
> +/**
> + * xpsgtr_bypass_descramdec - bypasses descrambler and 8b/10b encoder feature
> + * @gtr_phy: pointer to lane
> + *
> + * Return: None
> + */
> +static void xpsgtr_bypass_descramdec(struct xpsgtr_phy *gtr_phy)
> +{
> + u32 offset;
> + struct xpsgtr_dev *gtr_dev = gtr_phy->data;
> +
> + /* bypass Descrambler and 8b/10b decoder */
> + offset = gtr_phy->lane * L0_TM_DIG_6_OFFSET + L0_TM_DIG_6;
> + writel(L0_TM_DIS_DESCRAMBLE_DECODER, gtr_dev->serdes + offset);
> +}
> +
> +/**
> + * xpsgtr_misc_sgmii - miscellaneous settings for SGMII
> + * @gtr_phy: pointer to lane
> + *
> + * Return: None
> + */
> +static void xpsgtr_misc_sgmii(struct xpsgtr_phy *gtr_phy)
> +{
> + /* Set SGMII protocol tx bus width 10 bits */
> + xpsgtr_set_txwidth(gtr_phy, PROT_BUS_WIDTH_10);
> +
> + /* Set SGMII protocol rx bus width 10 bits */
> + xpsgtr_set_rxwidth(gtr_phy, PROT_BUS_WIDTH_10);
> +
> + /* bypass Descrambler and 8b/10b decoder */
> + xpsgtr_bypass_descramdec(gtr_phy);
> +
> + /* bypass Scrambler and 8b/10b Encoder */
> + xpsgtr_bypass_scramenc(gtr_phy);
> +}
> +
> +/**
> + * xpsgtr_misc_sata - miscellaneous settings for SATA
> + * @gtr_phy: pointer to lane
> + *
> + * Return: None
> + */
> +static void xpsgtr_misc_sata(struct xpsgtr_phy *gtr_phy)
> +{
> + struct xpsgtr_dev *gtr_dev = gtr_phy->data;
> +
> + /* bypass Descrambler and 8b/10b decoder */
> + xpsgtr_bypass_descramdec(gtr_phy);
> +
> + /* bypass Scrambler and 8b/10b Encoder */
> + xpsgtr_bypass_scramenc(gtr_phy);
> +
> + writel(gtr_phy->lane, gtr_dev->siou + SATA_CONTROL_OFFSET);
> +}
> +
> +/**
> + * xpsgtr_phyinit_required - check if phy_init for the lane can be skipped
> + * @gtr_phy: pointer to the phy lane
> + *
> + * Return: true if phy_init can be skipped or false
> + */
> +static bool xpsgtr_phyinit_required(struct xpsgtr_phy *gtr_phy)
> +{
> + /*
> + * As USB may save the snapshot of the states during hibernation, doing
> + * phy_init() will put the USB controller into reset, resulting in the
> + * losing of the saved snapshot. So try to avoid phy_init() for USB
> + * except when gtr_phy->skip_phy_init is false (this happens when FPD is
> + * shutdown during suspend or when gt lane is changed from current one)
> + */
> + if (gtr_phy->protocol == ICM_PROTOCOL_USB && gtr_phy->skip_phy_init)
> + return true;
> + else
> + return false;
> +}
> +
> +/**
> + * xpsgtr_phy_init - initializes a lane
> + * @phy: pointer to kernel PHY device
> + *
> + * Return: 0 on success or error on failure
> + */
> +static int xpsgtr_phy_init(struct phy *phy)
> +{
> + struct xpsgtr_phy *gtr_phy = phy_get_drvdata(phy);
> + struct xpsgtr_dev *gtr_dev = gtr_phy->data;
> + int ret = 0;
> + u32 offset;
> + u32 reg;
> + u32 nsw;
> + u32 timeout = TIMEOUT_US;
> +
> + mutex_lock(>r_dev->gtr_mutex);
> +
> + /* Check if phy_init() is required */
> + if (xpsgtr_phyinit_required(gtr_phy))
> + goto out;
> +
> + /* Put controller in reset */
> + ret = xpsgtr_controller_reset(gtr_phy);
> + if (ret != 0) {
> + dev_err(gtr_dev->dev, "Failed to assert reset\n");
> + goto out;
> + }
> +
> + /*
> + * There is a functional issue in the GT. The TX termination resistance
> + * can be out of spec due to a issue in the calibration logic. Below is
> + * the workaround to fix it. This below is required for XCZU9EG silicon.
> + */
> + if (gtr_dev->tx_term_fix) {
> + /* Enabling Test Mode control for CMN Rest */
> + reg = readl(gtr_dev->serdes + TM_CMN_RST);
> + reg = (reg & ~TM_CMN_RST_MASK) | TM_CMN_RST_SET;
> + writel(reg, gtr_dev->serdes + TM_CMN_RST);
> +
> + /* Set Test Mode reset */
> + reg = readl(gtr_dev->serdes + TM_CMN_RST);
> + reg = (reg & ~TM_CMN_RST_MASK) | TM_CMN_RST_EN;
> + writel(reg, gtr_dev->serdes + TM_CMN_RST);
> +
> + writel(0x00, gtr_dev->serdes + L3_TM_CALIB_DIG18);
> + writel(L3_TM_OVERRIDE_NSW_CODE, gtr_dev->serdes +
> + L3_TM_CALIB_DIG19);
> +
> + /* As a part of work around sequence for PMOS calibration fix,
> + * we need to configure any lane ICM_CFG to valid protocol. This
> + * will deassert the CMN_Resetn signal.
> + */
> + xpsgtr_lane_setprotocol(gtr_phy);
> +
> + /* Clear Test Mode reset */
> + reg = readl(gtr_dev->serdes + TM_CMN_RST);
> + reg = (reg & ~TM_CMN_RST_MASK) | TM_CMN_RST_SET;
> + writel(reg, gtr_dev->serdes + TM_CMN_RST);
> +
> + dev_dbg(gtr_dev->dev, "calibrating...\n");
> +
> + do {
> + reg = readl(gtr_dev->serdes + L3_CALIB_DONE_STATUS);
> + if ((reg & L3_CALIB_DONE) == L3_CALIB_DONE)
> + break;
> +
> + if (!--timeout) {
> + dev_err(gtr_dev->dev, "calibration time out\n");
> + ret = -ETIMEDOUT;
> + goto out;
> + }
> + udelay(1);
> + } while (timeout > 0);
> +
> + dev_dbg(gtr_dev->dev, "calibration done\n");
> +
> + /* Reading NMOS Register Code */
> + nsw = readl(gtr_dev->serdes + L0_TXPMA_ST_3);
> +
> + /* Set Test Mode reset */
> + reg = readl(gtr_dev->serdes + TM_CMN_RST);
> + reg = (reg & ~TM_CMN_RST_MASK) | TM_CMN_RST_EN;
> + writel(reg, gtr_dev->serdes + TM_CMN_RST);
> +
> + nsw = nsw & L0_DN_CALIB_CODE;
> +
> + /* Writing NMOS register values back [5:3] */
> + reg = nsw >> L3_NSW_CALIB_SHIFT;
> + writel(reg, gtr_dev->serdes + L3_TM_CALIB_DIG19);
> +
> + /* Writing NMOS register value [2:0] */
> + reg = ((nsw & L3_TM_CALIB_DIG19_NSW) << L3_NSW_SHIFT) |
> + (1 << L3_NSW_PIPE_SHIFT);
> + writel(reg, gtr_dev->serdes + L3_TM_CALIB_DIG18);
> +
> + /* Clear Test Mode reset */
> + reg = readl(gtr_dev->serdes + TM_CMN_RST);
> + reg = (reg & ~TM_CMN_RST_MASK) | TM_CMN_RST_SET;
> + writel(reg, gtr_dev->serdes + TM_CMN_RST);
> +
> + gtr_dev->tx_term_fix = false;
> + }
> +
> + /* Enable coarse code saturation limiting logic */
> + offset = gtr_phy->lane * L0_TM_PLL_DIG_37_OFFSET + L0_TM_PLL_DIG_37;
> + writel(L0_TM_COARSE_CODE_LIMIT, gtr_dev->serdes + offset);
> +
> + xpsgtr_configure_pll(gtr_phy);
> + xpsgtr_lane_setprotocol(gtr_phy);
> +
> + if (gtr_phy->protocol == ICM_PROTOCOL_SATA)
> + xpsgtr_misc_sata(gtr_phy);
> +
> + if (gtr_phy->protocol == ICM_PROTOCOL_SGMII)
> + xpsgtr_misc_sgmii(gtr_phy);
> +
> + /* Bring controller out of reset */
> + ret = xpsgtr_controller_release_reset(gtr_phy);
> + if (ret != 0) {
> + dev_err(gtr_dev->dev, "Failed to release reset\n");
> + goto out;
> + }
> +
> + /* Wait till pll is locked for all protocols except DP. For DP
> + * pll locking function will be called from driver.
> + */
> + if (gtr_phy->protocol != ICM_PROTOCOL_DP) {
> + ret = xpsgtr_wait_pll_lock(phy);
> + if (ret != 0)
> + goto out;
> + } else {
> + offset = gtr_phy->lane * L0_TXPMD_TM_45_OFFSET + L0_TXPMD_TM_45;
> + reg = L0_TXPMD_TM_45_OVER_DP_MAIN |
> + L0_TXPMD_TM_45_ENABLE_DP_MAIN |
> + L0_TXPMD_TM_45_OVER_DP_POST1 |
> + L0_TXPMD_TM_45_OVER_DP_POST2 |
> + L0_TXPMD_TM_45_ENABLE_DP_POST2;
> + writel(reg, gtr_dev->serdes + offset);
> + offset = gtr_phy->lane * L0_TX_ANA_TM_118_OFFSET +
> + L0_TX_ANA_TM_118;
> + writel(L0_TX_ANA_TM_118_FORCE_17_0,
> + gtr_dev->serdes + offset);
> + }
> +
> +out:
> + mutex_unlock(>r_dev->gtr_mutex);
> + return ret;
> +}
> +
> +/**
> + * xpsgtr_set_lanetype - derives lane type from dts arguments
> + * @gtr_phy: pointer to lane
> + * @controller: type of controller
> + * @instance_num: instance number of the controller in case multilane controller
> + *
> + * Return: 0 on success or error on failure
> + */
> +static int xpsgtr_set_lanetype(struct xpsgtr_phy *gtr_phy, u8 controller,
> + u8 instance_num)
> +{
> + switch (controller) {
> + case PHY_TYPE_SATA:
> + if (!instance_num)
> + gtr_phy->type = XPSGTR_TYPE_SATA_0;
> + else if (instance_num == 1)
> + gtr_phy->type = XPSGTR_TYPE_SATA_1;
> + else
> + return -EINVAL;
> + break;
> + case PHY_TYPE_USB3:
> + if (!instance_num)
> + gtr_phy->type = XPSGTR_TYPE_USB0;
> + else if (instance_num == 1)
> + gtr_phy->type = XPSGTR_TYPE_USB1;
> + else
> + return -EINVAL;
> + break;
> + case PHY_TYPE_DP:
> + if (!instance_num)
> + gtr_phy->type = XPSGTR_TYPE_DP_0;
> + else if (instance_num == 1)
> + gtr_phy->type = XPSGTR_TYPE_DP_1;
> + else
> + return -EINVAL;
> + break;
> + case PHY_TYPE_PCIE:
> + if (!instance_num)
> + gtr_phy->type = XPSGTR_TYPE_PCIE_0;
> + else if (instance_num == 1)
> + gtr_phy->type = XPSGTR_TYPE_PCIE_1;
> + else if (instance_num == 2)
> + gtr_phy->type = XPSGTR_TYPE_PCIE_2;
> + else if (instance_num == 3)
> + gtr_phy->type = XPSGTR_TYPE_PCIE_3;
> + else
> + return -EINVAL;
> + break;
> + case PHY_TYPE_SGMII:
> + if (!instance_num)
> + gtr_phy->type = XPSGTR_TYPE_SGMII0;
> + else if (instance_num == 1)
> + gtr_phy->type = XPSGTR_TYPE_SGMII1;
> + else if (instance_num == 2)
> + gtr_phy->type = XPSGTR_TYPE_SGMII2;
> + else if (instance_num == 3)
> + gtr_phy->type = XPSGTR_TYPE_SGMII3;
> + else
> + return -EINVAL;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +/**
> + * xpsgtr_xlate - provides a PHY specific to a controller
> + * @dev: pointer to device
> + * @args: arguments from dts
> + *
> + * Return: pointer to kernel PHY device or error on failure
> + */
> +static struct phy *xpsgtr_xlate(struct device *dev,
> + struct of_phandle_args *args)
> +{
> + struct xpsgtr_dev *gtr_dev = dev_get_drvdata(dev);
> + struct xpsgtr_phy *gtr_phy = NULL;
> + struct device_node *phynode = args->np;
> + int index;
> + int i;
> + u8 controller;
> + u8 instance_num;
> +
> + if (args->args_count != 4) {
> + dev_err(dev, "Invalid number of cells in 'phy' property\n");
> + return ERR_PTR(-EINVAL);
> + }
> + if (!of_device_is_available(phynode)) {
> + dev_warn(dev, "requested PHY is disabled\n");
> + return ERR_PTR(-ENODEV);
> + }
> + for (index = 0; index < of_get_child_count(dev->of_node); index++) {
> + if (phynode == gtr_dev->phys[index]->phy->dev.of_node) {
> + gtr_phy = gtr_dev->phys[index];
> + break;
> + }
> + }
> + if (!gtr_phy) {
> + dev_err(dev, "failed to find appropriate phy\n");
> + return ERR_PTR(-EINVAL);
> + }
> +
> + /* get type of controller from phys */
> + controller = args->args[0];
> +
> + /* get controller instance number */
> + instance_num = args->args[1];
> +
> + /* Check if lane sharing is required */
> + gtr_phy->share_laneclk = args->args[2];
> +
> + /* get the required clk rate for controller from phys */
> + gtr_phy->refclk_rate = args->args[3];
> +
> + /* derive lane type */
> + if (xpsgtr_set_lanetype(gtr_phy, controller, instance_num) < 0) {
> + dev_err(gtr_dev->dev, "Invalid lane type\n");
> + return ERR_PTR(-EINVAL);
> + }
> +
> + /* configures SSC settings for a lane */
> + if (xpsgtr_configure_lane(gtr_phy) < 0) {
> + dev_err(gtr_dev->dev, "Invalid clock rate: %d\n",
> + gtr_phy->refclk_rate);
> + return ERR_PTR(-EINVAL);
> + }
> +
> + /*
> + * Check Interconnect Matrix is obeyed i.e, given lane type
> + * is allowed to operate on the lane.
> + */
> + for (i = 0; i < CONTROLLERS_PER_LANE; i++) {
> + if (icm_matrix[index][i] == gtr_phy->type)
> + return gtr_phy->phy;
> + }
> +
> + /* Should not reach here */
> + return ERR_PTR(-EINVAL);
> +}
> +
> +/**
> + * xpsgtr_phy_exit - clears previous initialized variables
> + * @phy: pointer to kernel PHY device
> + *
> + * Return: 0 on success or error value on failure
> + */
> +static int xpsgtr_phy_exit(struct phy *phy)
> +{
> + struct xpsgtr_phy *gtr_phy = phy_get_drvdata(phy);
> +
> + if (!gtr_phy)
> + return -EINVAL;
> +
> + /* As we are exiting, clear skip_phy_init flag */
> + gtr_phy->skip_phy_init = false;
> +
> + return 0;
> +}
> +
> +static struct phy_ops xpsgtr_phyops = {
> + .init = xpsgtr_phy_init,
> + .exit = xpsgtr_phy_exit,
> + .owner = THIS_MODULE,
> +};
> +
> +/*
> + * xpsgtr_get_resets - Gets reset signals based on reset-names property
> + * @gtr_dev: pointer to structure which stores reset information
> + *
> + * Return: 0 on success or error value on failure
> + */
> +static int xpsgtr_get_resets(struct xpsgtr_dev *gtr_dev)
> +{
> + char *name;
> + struct reset_control *rst_temp;
> +
> + gtr_dev->sata_rst = devm_reset_control_get(gtr_dev->dev, "sata_rst");
> + if (IS_ERR(gtr_dev->sata_rst)) {
> + name = "sata_rst";
> + rst_temp = gtr_dev->sata_rst;
> + goto error;
> + }
> +
> + gtr_dev->dp_rst = devm_reset_control_get(gtr_dev->dev, "dp_rst");
> + if (IS_ERR(gtr_dev->dp_rst)) {
> + name = "dp_rst";
> + rst_temp = gtr_dev->dp_rst;
> + goto error;
> + }
> +
> + gtr_dev->usb0_crst = devm_reset_control_get(gtr_dev->dev, "usb0_crst");
> + if (IS_ERR(gtr_dev->usb0_crst)) {
> + name = "usb0_crst";
> + rst_temp = gtr_dev->usb0_crst;
> + goto error;
> + }
> +
> + gtr_dev->usb1_crst = devm_reset_control_get(gtr_dev->dev, "usb1_crst");
> + if (IS_ERR(gtr_dev->usb1_crst)) {
> + name = "usb1_crst";
> + rst_temp = gtr_dev->usb1_crst;
> + goto error;
> + }
> +
> + gtr_dev->usb0_hibrst = devm_reset_control_get(gtr_dev->dev,
> + "usb0_hibrst");
> + if (IS_ERR(gtr_dev->usb0_hibrst)) {
> + name = "usb0_hibrst";
> + rst_temp = gtr_dev->usb0_hibrst;
> + goto error;
> + }
> +
> + gtr_dev->usb1_hibrst = devm_reset_control_get(gtr_dev->dev,
> + "usb1_hibrst");
> + if (IS_ERR(gtr_dev->usb1_hibrst)) {
> + name = "usb1_hibrst";
> + rst_temp = gtr_dev->usb1_hibrst;
> + goto error;
> + }
> +
> + gtr_dev->usb0_apbrst = devm_reset_control_get(gtr_dev->dev,
> + "usb0_apbrst");
> + if (IS_ERR(gtr_dev->usb0_apbrst)) {
> + name = "usb0_apbrst";
> + rst_temp = gtr_dev->usb0_apbrst;
> + goto error;
> + }
> +
> + gtr_dev->usb1_apbrst = devm_reset_control_get(gtr_dev->dev,
> + "usb1_apbrst");
> + if (IS_ERR(gtr_dev->usb1_apbrst)) {
> + name = "usb1_apbrst";
> + rst_temp = gtr_dev->usb1_apbrst;
> + goto error;
> + }
> +
> + gtr_dev->gem0_rst = devm_reset_control_get(gtr_dev->dev, "gem0_rst");
> + if (IS_ERR(gtr_dev->gem0_rst)) {
> + name = "gem0_rst";
> + rst_temp = gtr_dev->gem0_rst;
> + goto error;
> + }
> +
> + gtr_dev->gem1_rst = devm_reset_control_get(gtr_dev->dev, "gem1_rst");
> + if (IS_ERR(gtr_dev->gem1_rst)) {
> + name = "gem1_rst";
> + rst_temp = gtr_dev->gem1_rst;
> + goto error;
> + }
> +
> + gtr_dev->gem2_rst = devm_reset_control_get(gtr_dev->dev, "gem2_rst");
> + if (IS_ERR(gtr_dev->gem2_rst)) {
> + name = "gem2_rst";
> + rst_temp = gtr_dev->gem2_rst;
> + goto error;
> + }
> +
> + gtr_dev->gem3_rst = devm_reset_control_get(gtr_dev->dev, "gem3_rst");
> + if (IS_ERR(gtr_dev->gem3_rst)) {
> + name = "gem3_rst";
> + rst_temp = gtr_dev->gem3_rst;
> + goto error;
> + }
> +
> + return 0;
> +error:
> + dev_err(gtr_dev->dev, "failed to get %s reset signal\n", name);
> + return PTR_ERR(rst_temp);
> +}
> +
> +/**
> + * xpsgtr_probe - The device probe function for driver initialization.
> + * @pdev: pointer to the platform device structure.
> + *
> + * Return: 0 for success and error value on failure
> + */
> +static int xpsgtr_probe(struct platform_device *pdev)
> +{
> + struct device_node *child, *np = pdev->dev.of_node;
> + struct xpsgtr_dev *gtr_dev;
> + struct phy_provider *provider;
> + struct phy *phy;
> + struct resource *res;
> + int lanecount, port = 0, index = 0;
> + int err;
> +
> + gtr_dev = devm_kzalloc(&pdev->dev, sizeof(*gtr_dev), GFP_KERNEL);
> + if (!gtr_dev)
> + return -ENOMEM;
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "serdes");
> + gtr_dev->serdes = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(gtr_dev->serdes))
> + return PTR_ERR(gtr_dev->serdes);
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "siou");
> + gtr_dev->siou = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(gtr_dev->siou))
> + return PTR_ERR(gtr_dev->siou);
> +
> + lanecount = of_get_child_count(np);
> + if (lanecount > MAX_LANES || lanecount == 0)
> + return -EINVAL;
> +
> + gtr_dev->phys = devm_kzalloc(&pdev->dev, sizeof(phy) * lanecount,
> + GFP_KERNEL);
> + if (!gtr_dev->phys)
> + return -ENOMEM;
> +
> + gtr_dev->dev = &pdev->dev;
> + platform_set_drvdata(pdev, gtr_dev);
> + mutex_init(>r_dev->gtr_mutex);
> +
> + if (of_device_is_compatible(np, "xlnx,zynqmp-psgtr"))
> + gtr_dev->tx_term_fix =
> + of_property_read_bool(np, "xlnx,tx_termination_fix");
> +
> + err = xpsgtr_get_resets(gtr_dev);
> + if (err) {
> + dev_err(&pdev->dev, "failed to get resets: %d\n", err);
> + return err;
> + }
> +
> + for_each_child_of_node(np, child) {
> + struct xpsgtr_phy *gtr_phy;
> +
> + gtr_phy = devm_kzalloc(&pdev->dev, sizeof(*gtr_phy),
> + GFP_KERNEL);
> + if (!gtr_phy)
> + return -ENOMEM;
> +
> + /* Assign lane number to gtr_phy instance */
> + gtr_phy->lane = index;
> +
> + /* Disable lane sharing as default */
> + gtr_phy->share_laneclk = -1;
> +
> + gtr_dev->phys[port] = gtr_phy;
> + phy = devm_phy_create(&pdev->dev, child, &xpsgtr_phyops);
> + if (IS_ERR(phy)) {
> + dev_err(&pdev->dev, "failed to create PHY\n");
> + return PTR_ERR(phy);
> + }
> + gtr_dev->phys[port]->phy = phy;
> + phy_set_drvdata(phy, gtr_dev->phys[port]);
> + gtr_phy->data = gtr_dev;
> + port++;
> + index++;
> + }
> + provider = devm_of_phy_provider_register(&pdev->dev, xpsgtr_xlate);
> + if (IS_ERR(provider)) {
> + dev_err(&pdev->dev, "registering provider failed\n");
> + return PTR_ERR(provider);
> + }
> + return 0;
> +}
> +
> +#ifdef CONFIG_PM
> +/**
> + * xpsgtr_suspend - The function for driver suspend.
> + * @dev: pointer to the device structure.
> + *
> + * Return: 0 for success and error value on failure
> + */
> +static int xpsgtr_suspend(struct device *dev)
> +{
> + struct xpsgtr_dev *gtr_dev = dev_get_drvdata(dev);
> +
> + if (!gtr_dev)
> + return -EINVAL;
> +
> + /* Save the snapshot ICM_CFG registers */
> + gtr_dev->saved_icm_cfg0 = readl(gtr_dev->serdes + ICM_CFG0);
> + gtr_dev->saved_icm_cfg1 = readl(gtr_dev->serdes + ICM_CFG1);
> +
> + return 0;
> +}
> +
> +/**
> + * xpsgtr_resume - The function for driver resume.
> + * @dev: pointer to the device structure.
> + *
> + * Return: 0 for success and error value on failure
> + */
> +static int xpsgtr_resume(struct device *dev)
> +{
> + unsigned int icm_cfg0, icm_cfg1, index;
> + bool skip_phy_init;
> + struct xpsgtr_phy *gtr_phy;
> + struct xpsgtr_dev *gtr_dev = dev_get_drvdata(dev);
> +
> + if (!gtr_dev)
> + return -EINVAL;
> +
> + icm_cfg0 = readl(gtr_dev->serdes + ICM_CFG0);
> + icm_cfg1 = readl(gtr_dev->serdes + ICM_CFG1);
> +
> + /* Return if no gt lanes got configured before suspend */
> + if (!gtr_dev->saved_icm_cfg0 && !gtr_dev->saved_icm_cfg1)
> + return 0;
> +
> + /* Check if the ICM configurations changed after suspend */
> + if (icm_cfg0 == gtr_dev->saved_icm_cfg0 &&
> + icm_cfg1 == gtr_dev->saved_icm_cfg1)
> + skip_phy_init = true;
> + else
> + skip_phy_init = false;
> +
> + /* This below updates the skip_phy_init for all gtr_phy instances */
> + for (index = 0; index < of_get_child_count(dev->of_node); index++) {
> + gtr_phy = gtr_dev->phys[index];
> + gtr_phy->skip_phy_init = skip_phy_init;
> + }
> +
> + return 0;
> +}
> +#endif /* CONFIG_PM */
> +
> +/* device PM ops */
> +static const struct dev_pm_ops xpsgtr_pm_ops = {
> + SET_SYSTEM_SLEEP_PM_OPS(xpsgtr_suspend, xpsgtr_resume)
> +};
> +
> +/* Match table for of_platform binding */
> +static const struct of_device_id xpsgtr_of_match[] = {
> + { .compatible = "xlnx,zynqmp-psgtr", },
> + { .compatible = "xlnx,zynqmp-psgtr-v1.1", },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, xpsgtr_of_match);
> +
> +static struct platform_driver xpsgtr_driver = {
> + .probe = xpsgtr_probe,
> + .driver = {
> + .name = "xilinx-psgtr",
> + .of_match_table = xpsgtr_of_match,
> + .pm = &xpsgtr_pm_ops,
> + },
> +};
> +
> +module_platform_driver(xpsgtr_driver);
> +
> +MODULE_AUTHOR("Xilinx Inc.");
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("Xilinx ZynqMP High speed Gigabit Transceiver");
> diff --git a/include/dt-bindings/phy/phy.h b/include/dt-bindings/phy/phy.h
> index d16e875..09cc0a6 100644
> --- a/include/dt-bindings/phy/phy.h
> +++ b/include/dt-bindings/phy/phy.h
> @@ -16,5 +16,7 @@
> #define PHY_TYPE_USB2 3
> #define PHY_TYPE_USB3 4
> #define PHY_TYPE_UFS 5
> +#define PHY_TYPE_DP 6
> +#define PHY_TYPE_SGMII 7
>
> #endif /* _DT_BINDINGS_PHY */
> diff --git a/include/linux/phy/phy-zynqmp.h b/include/linux/phy/phy-zynqmp.h
> new file mode 100644
> index 0000000..8dfd73f
> --- /dev/null
> +++ b/include/linux/phy/phy-zynqmp.h
> @@ -0,0 +1,52 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Xilinx ZynqMP PHY header
> + *
> + * Copyright (C) 2018 Xilinx, Inc.
> + *
> + * Author: Anurag Kumar Vulisha <anuragku@...inx.com>
> + * Author: Hyun Woo Kwon <hyunk@...inx.com>
> + *
> + */
> +
> +#ifndef _PHY_ZYNQMP_H_
> +#define _PHY_ZYNQMP_H_
> +
> +#include <linux/phy/phy.h>
> +
> +#if IS_ENABLED(CONFIG_PHY_XILINX_ZYNQMP)
> +void xpsgtr_override_deemph(struct phy *phy, u8 plvl, u8 vlvl);
> +void xpsgtr_margining_factor(struct phy *phy, u8 plvl, u8 vlvl);
> +int xpsgtr_wait_pll_lock(struct phy *phy);
> +int xpsgtr_usb_crst_assert(struct phy *phy);
> +int xpsgtr_usb_crst_release(struct phy *phy);
> +#else
> +
> +static inline int xpsgtr_override_deemph(struct phy *base, u8 plvl, u8 vlvl)
> +{
> + return -ENODEV;
> +}
> +
> +static inline int xpsgtr_margining_factor(struct phy *base, u8 plvl, u8 vlvl)
> +{
> + return -ENODEV;
> +}
> +
> +extern inline int xpsgtr_wait_pll_lock(struct phy *phy)
> +{
> + return -ENODEV;
> +}
> +
> +extern inline int xpsgtr_usb_crst_assert(struct phy *phy)
> +{
> + return -ENODEV;
> +}
> +
> +extern inline int xpsgtr_usb_crst_release(struct phy *phy)
> +{
> + return -ENODEV;
> +}
> +
> +#endif
> +
> +#endif /* _PHY_ZYNQMP_H_ */
> --
> 2.1.1
>
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