Message-ID: <c9c2a88e-dcf1-7608-3050-3e759d3d1945@ti.com>
Date:   Tue, 9 Oct 2018 13:17:37 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Anurag Kumar Vulisha <anurag.kumar.vulisha@...inx.com>,
        <robh+dt@...nel.org>, <mark.rutland@....com>,
        <michal.simek@...inx.com>, <vivek.gautam@...eaurora.org>
CC:     <v.anuragkumar@...il.com>, <APANDEY@...inx.com>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 2/2] phy: zynqmp: Add phy driver for xilinx zynqmp phy
 core

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@...inx.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@...inx.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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