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SubjectRe: [PATCH v4 2/2] phy: zynqmp: Add phy driver for xilinx zynqmp phy core
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Hi Anurag,

On Wednesday 12 September 2018 09:52 PM, Anurag Kumar Vulisha 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@xilinx.com>
> ---
> Changes in v4:
> 1. Moved include/dt-bindings/phy/phy.h into patch 1 as suggested by
> "Rob Herring"
>
> 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/linux/phy/phy-zynqmp.h | 52 ++
> 4 files changed, 1642 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..497862d
> --- /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@xilinx.com>
> + *
> + * 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 } };

Here the consumer driver directly passes the index of a local array as
argument. How is the consumer driver supposed to this index. What happens if
the same consumer is connected to a different PHY?

Thanks
Kishon

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