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Date: Wed, 13 May 2020 18:42:35 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC: <linux-kernel@...r.kernel.org>,
Anurag Kumar Vulisha <anurag.kumar.vulisha@...inx.com>,
Michal Simek <michal.simek@...inx.com>,
Vinod Koul <vkoul@...nel.org>
Subject: Re: [PATCH v7 2/3] phy: zynqmp: Add PHY driver for the Xilinx ZynqMP
Gigabit Transceiver
Hi Laurent,
On 5/13/2020 5:13 PM, Laurent Pinchart wrote:
> Hi Kishon,
>
> On Wed, May 13, 2020 at 08:16:19AM +0530, Kishon Vijay Abraham I wrote:
>> On 5/8/2020 6:23 AM, Laurent Pinchart wrote:
>>> On Thu, May 07, 2020 at 10:14:45AM +0530, Kishon Vijay Abraham I wrote:
>>>> On 4/2/2020 3:40 AM, Laurent Pinchart wrote:
>>>>> From: Anurag Kumar Vulisha <anurag.kumar.vulisha@...inx.com>
>>>>>
>>>>> Xilinx ZynqMP SoCs have 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>
>>>>> Signed-off-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>>>>> ---
>>>>> Changes since v5:
>>>>>
>>>>> - Cleanup headers
>>>>> - Organize the code in sections
>>>>> - Constify data tables and structures
>>>>> - Allocate all PHY instances in one go
>>>>> - Add I/O accessors
>>>>> - Move DP-specific init to a separate function
>>>>> - Use devm_platform_ioremap_resource_byname()
>>>>> - Simplify acquisition of reset controllers
>>>>> - Implement .configure() PHY operation for DP
>>>>> - Implement .power_on() and .power_off() operations
>>>>> - Wait for PLL lock for DP PHY too
>>>>> - Remove USB core reset operations
>>>>> - Fix SGMII bus width settings
>>>>> - Update copyright notice and authors list
>>>>> - Disable error messages on probe deferral
>>>>> - Update reset names to new DT bindings
>>>>> - Update to removal of subnodes in new DT bindings
>>>>> - Handle reference clocks through CCF
>>>>> - Add MAINTAINERS entry
>>>>> - Drop reset handling
>>>>> - Split TX term fix to separate function
>>>>> - Remove unused registers
>>>>> ---
>>>>> MAINTAINERS | 9 +
>>>>> drivers/phy/Kconfig | 8 +
>>>>> drivers/phy/Makefile | 1 +
>>>>> drivers/phy/phy-zynqmp.c | 995 +++++++++++++++++++++++++++++++++++++++
>>>>
>>>> Better to add a xilinx directory for this driver.
>>>
>>> OK.
>>>
>>>>> 4 files changed, 1013 insertions(+)
>>>>> create mode 100644 drivers/phy/phy-zynqmp.c
>>>>>
>>>>> diff --git a/MAINTAINERS b/MAINTAINERS
>>>>> index 07293073c4f6..19e630fcaf62 100644
>>>>> --- a/MAINTAINERS
>>>>> +++ b/MAINTAINERS
>>>>> @@ -18406,6 +18406,15 @@ F: Documentation/devicetree/bindings/dma/xilinx/xlnx,zynqmp-dpdma.yaml
>>>>> F: drivers/dma/xilinx/xilinx_dpdma.c
>>>>> F: include/dt-bindings/dma/xlnx-zynqmp-dpdma.h
>>>>>
>>>>> +XILINX ZYNQMP GSPTR PHY DRIVER
>>>>
>>>> Looks like a typo here, rest of the place seems to use PSGTR
>>>
>>> Good catch. Will fix it.
>>>
>>>>> +M: Anurag Kumar Vulisha <anurag.kumar.vulisha@...inx.com>
>>>>> +M: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>>>>> +L: linux-kernel@...r.kernel.org
>>>>> +T: git https://github.com/Xilinx/linux-xlnx.git
>>>>> +S: Supported
>>>>> +F: Documentation/devicetree/bindings/phy/xlnx,zynqmp-psgtr.yaml
>>>>> +F: drivers/phy/phy-zynqmp.c
>>>>> +
>>>>> XILLYBUS DRIVER
>>>>> M: Eli Billauer <eli.billauer@...il.com>
>>>>> L: linux-kernel@...r.kernel.org
>>>>> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
>>>>> index b3ed94b98d9b..b8251b9f3d87 100644
>>>>> --- a/drivers/phy/Kconfig
>>>>> +++ b/drivers/phy/Kconfig
>>>>> @@ -49,6 +49,14 @@ 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 310c149a9df5..5dc7469f078b 100644
>>>>> --- a/drivers/phy/Makefile
>>>>> +++ b/drivers/phy/Makefile
>>>>> @@ -8,6 +8,7 @@ obj-$(CONFIG_GENERIC_PHY_MIPI_DPHY) += phy-core-mipi-dphy.o
>>>>> obj-$(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_ARCH_MEDIATEK) += mediatek/
>>>>> diff --git a/drivers/phy/phy-zynqmp.c b/drivers/phy/phy-zynqmp.c
>>>>> new file mode 100644
>>>>> index 000000000000..8ab99d6b9220
>>>>> --- /dev/null
>>>>> +++ b/drivers/phy/phy-zynqmp.c
>>>>> @@ -0,0 +1,995 @@
>>>>> +// SPDX-License-Identifier: GPL-2.0
>>>>> +/*
>>>>> + * phy-zynqmp.c - PHY driver for Xilinx ZynqMP GT.
>>>>> + *
>>>>> + * Copyright (C) 2018-20 Xilinx Inc.
>>>>> + *
>>>>> + * Author: Anurag Kumar Vulisha <anuragku@...inx.com>
>>>>> + * Author: Subbaraya Sundeep <sundeep.lkml@...il.com>
>>>>> + * Author: Laurent Pinchart <laurent.pinchart@...asonboard.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/phy/phy.h>
>>>>> +#include <linux/platform_device.h>
>>>>> +#include <linux/slab.h>
>>>>> +
>>>>> +#include <dt-bindings/phy/phy.h>
>>>>> +
>>>>> +/*
>>>>> + * Lane Registers
>>>>> + */
>>>>> +
>>>>> +/* TX De-emphasis parameters */
>>>>> +#define L0_TX_ANA_TM_18 0x0048
>>>>> +#define L0_TX_ANA_TM_118 0x01d8
>>>>> +#define L0_TX_ANA_TM_118_FORCE_17_0 BIT(0)
>>>>> +
>>>>> +/* DN Resistor calibration code parameters */
>>>>> +#define L0_TXPMA_ST_3 0x0b0c
>>>>> +#define L0_DN_CALIB_CODE 0x3f
>>>>> +
>>>>> +/* PMA control parameters */
>>>>> +#define L0_TXPMD_TM_45 0x0cb4
>>>>> +#define L0_TXPMD_TM_48 0x0cc0
>>>>> +#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)
>>>>> +
>>>>> +/* PCS control parameters */
>>>>> +#define L0_TM_DIG_6 0x106c
>>>>> +#define L0_TM_DIS_DESCRAMBLE_DECODER 0x0f
>>>>> +#define L0_TX_DIG_61 0x00f4
>>>>> +#define L0_TM_DISABLE_SCRAMBLE_ENCODER 0x0f
>>>>> +
>>>>> +/* PLL Test Mode register parameters */
>>>>> +#define L0_TM_PLL_DIG_37 0x2094
>>>>> +#define L0_TM_COARSE_CODE_LIMIT 0x10
>>>>> +
>>>>> +/* PLL SSC step size offsets */
>>>>> +#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_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_0_MASK 0xff
>>>>> +#define STEPS_1_MASK 0x07
>>>>> +
>>>>> +/* Reference clock selection parameters */
>>>>> +#define L0_Ln_REF_CLK_SEL(n) (0x2860 + (n) * 4)
>>>>> +#define L0_REF_CLK_SEL_MASK 0x8f
>>>>> +
>>>>> +/* 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
>>>>> +
>>>>> +#define PHY_REG_OFFSET 0x4000
>>>>> +
>>>>> +/*
>>>>> + * Global Registers
>>>>> + */
>>>>> +
>>>>> +/* Refclk selection parameters */
>>>>> +#define PLL_REF_SEL(n) (0x10000 + (n) * 4)
>>>>> +#define PLL_FREQ_MASK 0x1f
>>>>> +#define PLL_STATUS_LOCKED 0x10
>>>>> +
>>>>> +/* 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
>>>>> +
>>>>> +/* 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
>>>>> +
>>>>> +/* Number of GT lanes */
>>>>> +#define NUM_LANES 4
>>>>> +
>>>>> +/* SIOU SATA control register */
>>>>> +#define SATA_CONTROL_OFFSET 0x0100
>>>>> +
>>>>> +/* Total number of controllers */
>>>>> +#define CONTROLLERS_PER_LANE 5
>>>>> +
>>>>> +/* Protocol Type parameters */
>>>>> +#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 TIMEOUT_US 1000
>>>>> +
>>>>> +struct xpsgtr_dev;
>>>>> +
>>>>> +/**
>>>>> + * 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;
>>>>> +};
>>>>> +
>>>>> +/**
>>>>> + * 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
>>>>> + * @skip_phy_init: skip phy_init() if true
>>>>> + * @dev: pointer to the xpsgtr_dev instance
>>>>> + * @refclk: reference clock index
>>>>> + */
>>>>> +struct xpsgtr_phy {
>>>>> + struct phy *phy;
>>>>> + u8 type;
>>>>> + u8 lane;
>>>>> + u8 protocol;
>>>>> + bool skip_phy_init;
>>>>> + struct xpsgtr_dev *dev;
>>>>> + unsigned int refclk;
>>>>> +};
>>>>> +
>>>>> +/**
>>>>> + * 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: PHY lanes
>>>>> + * @refclk_sscs: spread spectrum settings for the reference clocks
>>>>> + * @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
>>>>> + */
>>>>> +struct xpsgtr_dev {
>>>>> + struct device *dev;
>>>>> + void __iomem *serdes;
>>>>> + void __iomem *siou;
>>>>> + struct mutex gtr_mutex; /* mutex for locking */
>>>>> + struct xpsgtr_phy phys[NUM_LANES];
>>>>> + const struct xpsgtr_ssc *refclk_sscs[NUM_LANES];
>>>>> + bool tx_term_fix;
>>>>> + unsigned int saved_icm_cfg0;
>>>>> + unsigned int saved_icm_cfg1;
>>>>> +};
>>>>> +
>>>>> +/* -----------------------------------------------------------------------------
>>>>
>>>> The dash here is not commonly used. Please stick to default multi-line comment
>>>> style.
>>>
>>> It's more common in some subsystems than others :-) No big deal, I'll
>>> drop it (even if I think it increases readability by clearly marking
>>> sections visually).
>>>
>>>>> + * Configuration Data
>>>>> + */
>>>>> +
>>>>> +/* lookup table to hold all settings needed for a ref clock frequency */
>>>>> +static const struct xpsgtr_ssc ssc_lookup[] = {
>>>>> + { 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 }
>>>>> +};
>>>>> +
>>>>> +/* -----------------------------------------------------------------------------
>>>>> + * I/O Accessors
>>>>> + */
>>>>> +
>>>>> +static inline u32 xpsgtr_read(struct xpsgtr_dev *gtr_dev, u32 reg)
>>>>> +{
>>>>> + return readl(gtr_dev->serdes + reg);
>>>>> +}
>>>>> +
>>>>> +static inline void xpsgtr_write(struct xpsgtr_dev *gtr_dev, u32 reg, u32 value)
>>>>> +{
>>>>> + writel(value, gtr_dev->serdes + reg);
>>>>> +}
>>>>> +
>>>>> +static inline void xpsgtr_clr_set(struct xpsgtr_dev *gtr_dev, u32 reg,
>>>>> + u32 clr, u32 set)
>>>>> +{
>>>>> + u32 value = xpsgtr_read(gtr_dev, reg);
>>>>> +
>>>>> + value &= ~clr;
>>>>> + value |= set;
>>>>> + xpsgtr_write(gtr_dev, reg, value);
>>>>> +}
>>>>> +
>>>>> +static inline u32 xpsgtr_read_phy(struct xpsgtr_phy *gtr_phy, u32 reg)
>>>>> +{
>>>>> + void __iomem *addr = gtr_phy->dev->serdes
>>>>> + + gtr_phy->lane * PHY_REG_OFFSET + reg;
>>>>> +
>>>>> + return readl(addr);
>>>>> +}
>>>>> +
>>>>> +static inline void xpsgtr_write_phy(struct xpsgtr_phy *gtr_phy,
>>>>> + u32 reg, u32 value)
>>>>> +{
>>>>> + void __iomem *addr = gtr_phy->dev->serdes
>>>>> + + gtr_phy->lane * PHY_REG_OFFSET + reg;
>>>>> +
>>>>> + writel(value, addr);
>>>>> +}
>>>>> +
>>>>> +static inline void xpsgtr_clr_set_phy(struct xpsgtr_phy *gtr_phy,
>>>>> + u32 reg, u32 clr, u32 set)
>>>>> +{
>>>>> + void __iomem *addr = gtr_phy->dev->serdes
>>>>> + + gtr_phy->lane * PHY_REG_OFFSET + reg;
>>>>> +
>>>>> + writel((readl(addr) & ~clr) | set, addr);
>>>>> +}
>>>>> +
>>>>> +/* -----------------------------------------------------------------------------
>>>>> + * Hardware Configuration
>>>>> + */
>>>>> +
>>>>> +/* Wait for the PLL to lock (with a timeout). */
>>>>> +static int xpsgtr_wait_pll_lock(struct phy *phy)
>>>>> +{
>>>>> + struct xpsgtr_phy *gtr_phy = phy_get_drvdata(phy);
>>>>> + struct xpsgtr_dev *gtr_dev = gtr_phy->dev;
>>>>> + unsigned int timeout = TIMEOUT_US;
>>>>> + int ret;
>>>>> +
>>>>> + dev_dbg(gtr_dev->dev, "Waiting for PLL lock\n");
>>>>> +
>>>>> + while (1) {
>>>>> + u32 reg = xpsgtr_read_phy(gtr_phy, L0_PLL_STATUS_READ_1);
>>>>> +
>>>>> + if ((reg & PLL_STATUS_LOCKED) == PLL_STATUS_LOCKED) {
>>>>> + ret = 0;
>>>>> + break;
>>>>> + }
>>>>> +
>>>>> + if (--timeout == 0) {
>>>>> + ret = -ETIMEDOUT;
>>>>> + break;
>>>>> + }
>>>>> +
>>>>> + udelay(1);
>>>>> + }
>>>>> +
>>>>> + if (ret == -ETIMEDOUT)
>>>>> + dev_err(gtr_dev->dev,
>>>>> + "lane %u (type %u, protocol %u): PLL lock timeout\n",
>>>>> + gtr_phy->lane, gtr_phy->type, gtr_phy->protocol);
>>>>> +
>>>>> + return ret;
>>>>> +}
>>>>> +
>>>>> +/* Configure PLL and spread-sprectrum clock. */
>>>>> +static void xpsgtr_configure_pll(struct xpsgtr_phy *gtr_phy)
>>>>> +{
>>>>> + const struct xpsgtr_ssc *ssc;
>>>>> + u32 step_size;
>>>>> +
>>>>> + ssc = gtr_phy->dev->refclk_sscs[gtr_phy->refclk];
>>>>> + step_size = ssc->step_size;
>>>>> +
>>>>> + xpsgtr_clr_set(gtr_phy->dev, PLL_REF_SEL(gtr_phy->lane),
>>>>> + PLL_FREQ_MASK, ssc->pll_ref_clk);
>>>>> +
>>>>> + /* Enable lane clock sharing, if required */
>>>>> + if (gtr_phy->refclk != gtr_phy->lane) {
>>>>> + /* Lane3 Ref Clock Selection Register */
>>>>> + xpsgtr_clr_set(gtr_phy->dev, L0_Ln_REF_CLK_SEL(gtr_phy->lane),
>>>>> + L0_REF_CLK_SEL_MASK, 1 << gtr_phy->refclk);
>>>>> + }
>>>>> +
>>>>> + /* SSC step size [7:0] */
>>>>> + xpsgtr_clr_set_phy(gtr_phy, L0_PLL_SS_STEP_SIZE_0_LSB,
>>>>> + STEP_SIZE_0_MASK, step_size & STEP_SIZE_0_MASK);
>>>>> +
>>>>> + /* SSC step size [15:8] */
>>>>> + step_size >>= STEP_SIZE_SHIFT;
>>>>> + xpsgtr_clr_set_phy(gtr_phy, L0_PLL_SS_STEP_SIZE_1,
>>>>> + STEP_SIZE_1_MASK, step_size & STEP_SIZE_1_MASK);
>>>>> +
>>>>> + /* SSC step size [23:16] */
>>>>> + step_size >>= STEP_SIZE_SHIFT;
>>>>> + xpsgtr_clr_set_phy(gtr_phy, L0_PLL_SS_STEP_SIZE_2,
>>>>> + STEP_SIZE_2_MASK, step_size & STEP_SIZE_2_MASK);
>>>>> +
>>>>> + /* SSC steps [7:0] */
>>>>> + xpsgtr_clr_set_phy(gtr_phy, L0_PLL_SS_STEPS_0_LSB,
>>>>> + STEPS_0_MASK, ssc->steps & STEPS_0_MASK);
>>>>> +
>>>>> + /* SSC steps [10:8] */
>>>>> + xpsgtr_clr_set_phy(gtr_phy, L0_PLL_SS_STEPS_1_MSB,
>>>>> + STEPS_1_MASK,
>>>>> + (ssc->steps >> STEP_SIZE_SHIFT) & STEPS_1_MASK);
>>>>> +
>>>>> + /* SSC step size [24:25] */
>>>>> + step_size >>= STEP_SIZE_SHIFT;
>>>>> + xpsgtr_clr_set_phy(gtr_phy, L0_PLL_SS_STEP_SIZE_3_MSB,
>>>>> + STEP_SIZE_3_MASK, (step_size & STEP_SIZE_3_MASK) |
>>>>> + FORCE_STEP_SIZE | FORCE_STEPS);
>>>>> +}
>>>>> +
>>>>> +/* Configure the lane protocol. */
>>>>> +static void xpsgtr_lane_set_protocol(struct xpsgtr_phy *gtr_phy)
>>>>> +{
>>>>> + struct xpsgtr_dev *gtr_dev = gtr_phy->dev;
>>>>> + u8 protocol = gtr_phy->protocol;
>>>>> +
>>>>> + switch (gtr_phy->lane) {
>>>>> + case 0:
>>>>> + xpsgtr_clr_set(gtr_dev, ICM_CFG0, ICM_CFG0_L0_MASK, protocol);
>>>>> + break;
>>>>> + case 1:
>>>>> + xpsgtr_clr_set(gtr_dev, ICM_CFG0, ICM_CFG0_L1_MASK,
>>>>> + protocol << ICM_CFG_SHIFT);
>>>>> + break;
>>>>> + case 2:
>>>>> + xpsgtr_clr_set(gtr_dev, ICM_CFG1, ICM_CFG0_L0_MASK, protocol);
>>>>> + break;
>>>>> + case 3:
>>>>> + xpsgtr_clr_set(gtr_dev, ICM_CFG1, ICM_CFG0_L1_MASK,
>>>>> + protocol << ICM_CFG_SHIFT);
>>>>> + break;
>>>>> + default:
>>>>> + /* We already checked 0 <= lane <= 3 */
>>>>> + break;
>>>>> + }
>>>>> +}
>>>>> +
>>>>> +/* Bypass (de)scrambler and 8b/10b decoder and encoder. */
>>>>> +static void xpsgtr_bypass_scrambler_8b10b(struct xpsgtr_phy *gtr_phy)
>>>>> +{
>>>>> + xpsgtr_write_phy(gtr_phy, L0_TM_DIG_6, L0_TM_DIS_DESCRAMBLE_DECODER);
>>>>> + xpsgtr_write_phy(gtr_phy, L0_TX_DIG_61, L0_TM_DISABLE_SCRAMBLE_ENCODER);
>>>>> +}
>>>>> +
>>>>> +/* DP-specific initialization. */
>>>>> +static void xpsgtr_phy_init_dp(struct xpsgtr_phy *gtr_phy)
>>>>> +{
>>>>> + xpsgtr_write_phy(gtr_phy, L0_TXPMD_TM_45,
>>>>> + 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);
>>>>> + xpsgtr_write_phy(gtr_phy, L0_TX_ANA_TM_118,
>>>>> + L0_TX_ANA_TM_118_FORCE_17_0);
>>>>> +}
>>>>> +
>>>>> +/* SATA-specific initialization. */
>>>>> +static void xpsgtr_phy_init_sata(struct xpsgtr_phy *gtr_phy)
>>>>> +{
>>>>> + struct xpsgtr_dev *gtr_dev = gtr_phy->dev;
>>>>> +
>>>>> + xpsgtr_bypass_scrambler_8b10b(gtr_phy);
>>>>> +
>>>>> + writel(gtr_phy->lane, gtr_dev->siou + SATA_CONTROL_OFFSET);
>>>>> +}
>>>>
>>>> The cover letter mentions this has been tested with DP. Was it tested with SATA
>>>> and SGMII as well?
>>>
>>> On the Xilinx downstream kernel only, as SATA and SGMII isn't available
>>> upstream yet.
>>
>> Would prefer to merge only what is tested upstream. Are there plans of getting
>> SATA and SGMII upstream? Are the patches posted?
>
> The SATA controller is compatible with the drivers/ata/ahci_ceva.c
> driver present upstream, which supports PHYs through the ahci_platform
> helpers. I've just checked and there are no changes in drivers/ata/ in
> the Xilinx tree compared to mainline. I think it's thus just a matter of
> DT integration (that part is present in the Xilinx tree but not in
> mainline).
>
> Ethernet for ZynqMP is supported by the drivers/net/ethernet/cadence
> driver. The driver supports SGMII, but I'm not sure how it integrates
> with PSGTR.
>
> Maybe Anurag or Michal can comment on all this, and Xilinx's plans to
> upstream missing features, if any ?
>
> I can strip down the SATA and SGMII support from the driver, but that's
> very little code, and as drivers exist upstream for both SATA and SGMII,
> with DT integration being the only missing piece for SATA as far as I
> understand, I'd rather keep it in the driver.
If just dt integration is pending, then it's fine.
Regards
Kishon
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