--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * phy-zynqmp.c - PHY driver for Xilinx ZynqMP GT.
+ *
+ * Copyright (C) 2018-2020 Xilinx Inc.
+ *
+ * Author: Anurag Kumar Vulisha <anuragku@xilinx.com>
+ * Author: Subbaraya Sundeep <sundeep.lkml@gmail.com>
+ * Author: Laurent Pinchart <laurent.pinchart@ideasonboard.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;
+};
+
+/*
+ * 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);
+}
+
+/* SGMII-specific initialization. */
+static void xpsgtr_phy_init_sgmii(struct xpsgtr_phy *gtr_phy)
+{
+ struct xpsgtr_dev *gtr_dev = gtr_phy->dev;
+
+ /* Set SGMII protocol TX and RX bus width to 10 bits. */
+ xpsgtr_write(gtr_dev, TX_PROT_BUS_WIDTH,
+ PROT_BUS_WIDTH_10 << (gtr_phy->lane * PROT_BUS_WIDTH_SHIFT));
+ xpsgtr_write(gtr_dev, RX_PROT_BUS_WIDTH,
+ PROT_BUS_WIDTH_10 << (gtr_phy->lane * PROT_BUS_WIDTH_SHIFT));
+
+ xpsgtr_bypass_scrambler_8b10b(gtr_phy);
+}
+
+/* Configure TX de-emphasis and margining for DP. */
+static void xpsgtr_phy_configure_dp(struct xpsgtr_phy *gtr_phy, unsigned int pre,
+ unsigned int voltage)
+{
+ static const u8 voltage_swing[4][4] = {
+ { 0x2a, 0x27, 0x24, 0x20 },
+ { 0x27, 0x23, 0x20, 0xff },
+ { 0x24, 0x20, 0xff, 0xff },
+ { 0xff, 0xff, 0xff, 0xff }
+ };
+ static const u8 pre_emphasis[4][4] = {
+ { 0x02, 0x02, 0x02, 0x02 },
+ { 0x01, 0x01, 0x01, 0xff },
+ { 0x00, 0x00, 0xff, 0xff },
+ { 0xff, 0xff, 0xff, 0xff }
+ };
+
+ xpsgtr_write_phy(gtr_phy, L0_TXPMD_TM_48, voltage_swing[pre][voltage]);
+ xpsgtr_write_phy(gtr_phy, L0_TX_ANA_TM_18, pre_emphasis[pre][voltage]);
+}
+
+/*
+ * PHY Operations
+ */
+
+static bool xpsgtr_phy_init_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 false;
+ else
+ return true;
+}
+
+/*
+ * 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. This is the workaround
+ * to fix it, required for XCZU9EG silicon.
+ */
+static int xpsgtr_phy_tx_term_fix(struct xpsgtr_phy *gtr_phy)
+{
+ struct xpsgtr_dev *gtr_dev = gtr_phy->dev;
+ u32 timeout = TIMEOUT_US;
+ u32 nsw;
+
+ /* Enabling Test Mode control for CMN Rest */
+ xpsgtr_clr_set(gtr_dev, TM_CMN_RST, TM_CMN_RST_MASK, TM_CMN_RST_SET);
+
+ /* Set Test Mode reset */
+ xpsgtr_clr_set(gtr_dev, TM_CMN_RST, TM_CMN_RST_MASK, TM_CMN_RST_EN);
+
+ xpsgtr_write(gtr_dev, L3_TM_CALIB_DIG18, 0x00);
+ xpsgtr_write(gtr_dev, L3_TM_CALIB_DIG19, L3_TM_OVERRIDE_NSW_CODE);
+
+ /*
+ * 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_set_protocol(gtr_phy);
+
+ /* Clear Test Mode reset */
+ xpsgtr_clr_set(gtr_dev, TM_CMN_RST, TM_CMN_RST_MASK, TM_CMN_RST_SET);
+
+ dev_dbg(gtr_dev->dev, "calibrating...\n");
+
+ do {
+ u32 reg = xpsgtr_read(gtr_dev, L3_CALIB_DONE_STATUS);
+
+ if ((reg & L3_CALIB_DONE) == L3_CALIB_DONE)
+ break;
+
+ if (!--timeout) {
+ dev_err(gtr_dev->dev, "calibration time out\n");
+ return -ETIMEDOUT;
+ }
+
+ udelay(1);
+ } while (timeout > 0);
+
+ dev_dbg(gtr_dev->dev, "calibration done\n");
+
+ /* Reading NMOS Register Code */
+ nsw = xpsgtr_read(gtr_dev, L0_TXPMA_ST_3) & L0_DN_CALIB_CODE;
+
+ /* Set Test Mode reset */
+ xpsgtr_clr_set(gtr_dev, TM_CMN_RST, TM_CMN_RST_MASK, TM_CMN_RST_EN);
+
+ /* Writing NMOS register values back [5:3] */
+ xpsgtr_write(gtr_dev, L3_TM_CALIB_DIG19, nsw >> L3_NSW_CALIB_SHIFT);
+
+ /* Writing NMOS register value [2:0] */
+ xpsgtr_write(gtr_dev, L3_TM_CALIB_DIG18,
+ ((nsw & L3_TM_CALIB_DIG19_NSW) << L3_NSW_SHIFT) |
+ (1 << L3_NSW_PIPE_SHIFT));
+
+ /* Clear Test Mode reset */
+ xpsgtr_clr_set(gtr_dev, TM_CMN_RST, TM_CMN_RST_MASK, TM_CMN_RST_SET);
+
+ return 0;
+}
+
+static int xpsgtr_phy_init(struct phy *phy)
+{
+ struct xpsgtr_phy *gtr_phy = phy_get_drvdata(phy);
+ struct xpsgtr_dev *gtr_dev = gtr_phy->dev;
+ int ret = 0;
+
+ mutex_lock(>r_dev->gtr_mutex);
+
+ /* Skip initialization if not required. */
+ if (!xpsgtr_phy_init_required(gtr_phy))
+ goto out;
+
+ if (gtr_dev->tx_term_fix) {
+ ret = xpsgtr_phy_tx_term_fix(gtr_phy);
+ if (ret < 0)
+ goto out;
+
+ gtr_dev->tx_term_fix = false;
+ }
+
+ /* Enable coarse code saturation limiting logic. */
+ xpsgtr_write_phy(gtr_phy, L0_TM_PLL_DIG_37, L0_TM_COARSE_CODE_LIMIT);
+
+ /*
+ * Configure the PLL, the lane protocol, and perform protocol-specific
+ * initialization.
+ */
+ xpsgtr_configure_pll(gtr_phy);
+ xpsgtr_lane_set_protocol(gtr_phy);
+
+ switch (gtr_phy->protocol) {
+ case ICM_PROTOCOL_DP:
+ xpsgtr_phy_init_dp(gtr_phy);
+ break;
+
+ case ICM_PROTOCOL_SATA:
+ xpsgtr_phy_init_sata(gtr_phy);
+ break;
+
+ case ICM_PROTOCOL_SGMII:
+ xpsgtr_phy_init_sgmii(gtr_phy);
+ break;
+ }
+
+out:
+ mutex_unlock(>r_dev->gtr_mutex);
+ return ret;
+}
+
+static int xpsgtr_phy_exit(struct phy *phy)
+{
+ struct xpsgtr_phy *gtr_phy = phy_get_drvdata(phy);
+
+ gtr_phy->skip_phy_init = false;
+
+ return 0;
+}
+
+static int xpsgtr_phy_power_on(struct phy *phy)
+{
+ struct xpsgtr_phy *gtr_phy = phy_get_drvdata(phy);
+ int ret = 0;
+
+ /*
+ * Wait for the PLL to lock. For DP, only wait on DP0 to avoid
+ * cumulating waits for both lanes. The user is expected to initialize
+ * lane 0 last.
+ */
+ if (gtr_phy->protocol != ICM_PROTOCOL_DP ||
+ gtr_phy->type == XPSGTR_TYPE_DP_0)
+ ret = xpsgtr_wait_pll_lock(phy);
+
+ return ret;
+}
+
+static int xpsgtr_phy_configure(struct phy *phy, union phy_configure_opts *opts)
+{
+ struct xpsgtr_phy *gtr_phy = phy_get_drvdata(phy);
+
+ if (gtr_phy->protocol != ICM_PROTOCOL_DP)
+ return 0;
+
+ xpsgtr_phy_configure_dp(gtr_phy, opts->dp.pre[0], opts->dp.voltage[0]);
+
+ return 0;
+}
+
+static const struct phy_ops xpsgtr_phyops = {
+ .init = xpsgtr_phy_init,
+ .exit = xpsgtr_phy_exit,
+ .power_on = xpsgtr_phy_power_on,
+ .configure = xpsgtr_phy_configure,
+ .owner = THIS_MODULE,
+};
+
+/*
+ * OF Xlate Support
+ */
+
+/* Set the lane type and protocol based on the PHY type and instance number. */
+static int xpsgtr_set_lane_type(struct xpsgtr_phy *gtr_phy, u8 phy_type,
+ unsigned int phy_instance)
+{
+ unsigned int num_phy_types;
+ const int *phy_types;
+
+ switch (phy_type) {
+ case PHY_TYPE_SATA: {
+ static const int types[] = {
+ XPSGTR_TYPE_SATA_0,
+ XPSGTR_TYPE_SATA_1,
+ };
+
+ phy_types = types;
+ num_phy_types = ARRAY_SIZE(types);
+ gtr_phy->protocol = ICM_PROTOCOL_SATA;
+ break;
+ }
+ case PHY_TYPE_USB3: {
+ static const int types[] = {
+ XPSGTR_TYPE_USB0,
+ XPSGTR_TYPE_USB1,
+ };
+
+ phy_types = types;
+ num_phy_types = ARRAY_SIZE(types);
+ gtr_phy->protocol = ICM_PROTOCOL_USB;
+ break;
+ }
+ case PHY_TYPE_DP: {
+ static const int types[] = {
+ XPSGTR_TYPE_DP_0,
+ XPSGTR_TYPE_DP_1,
+ };
+
+ phy_types = types;
+ num_phy_types = ARRAY_SIZE(types);
+ gtr_phy->protocol = ICM_PROTOCOL_DP;
+ break;
+ }
+ case PHY_TYPE_PCIE: {
+ static const int types[] = {
+ XPSGTR_TYPE_PCIE_0,
+ XPSGTR_TYPE_PCIE_1,
+ XPSGTR_TYPE_PCIE_2,
+ XPSGTR_TYPE_PCIE_3,
+ };
+
+ phy_types = types;
+ num_phy_types = ARRAY_SIZE(types);
+ gtr_phy->protocol = ICM_PROTOCOL_PCIE;
+ break;
+ }
+ case PHY_TYPE_SGMII: {
+ static const int types[] = {
+ XPSGTR_TYPE_SGMII0,
+ XPSGTR_TYPE_SGMII1,
+ XPSGTR_TYPE_SGMII2,
+ XPSGTR_TYPE_SGMII3,
+ };
+
+ phy_types = types;
+ num_phy_types = ARRAY_SIZE(types);
+ gtr_phy->protocol = ICM_PROTOCOL_SGMII;
+ break;
+ }
+ default:
+ return -EINVAL;
+ }
+
+ if (phy_instance >= num_phy_types)
+ return -EINVAL;
+
+ gtr_phy->type = phy_types[phy_instance];
+ return 0;
+}
+
+/*
+ * Valid combinations of controllers and lanes (Interconnect Matrix).
+ */
+static const unsigned int icm_matrix[NUM_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 }
+};
+
+/* Translate OF phandle and args to PHY instance. */
+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;
+ unsigned int phy_instance;
+ unsigned int phy_lane;
+ unsigned int phy_type;
+ unsigned int refclk;
+ unsigned int i;
+ int ret;
+
+ if (args->args_count != 4) {
+ dev_err(dev, "Invalid number of cells in 'phy' property\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ /*
+ * Get the PHY parameters from the OF arguments and derive the lane
+ * type.
+ */
+ phy_lane = args->args[0];
+ if (phy_lane >= ARRAY_SIZE(gtr_dev->phys)) {
+ dev_err(dev, "Invalid lane number %u\n", phy_lane);
+ return ERR_PTR(-ENODEV);
+ }
+
+ gtr_phy = >r_dev->phys[phy_lane];
+ phy_type = args->args[1];
+ phy_instance = args->args[2];
+
+ ret = xpsgtr_set_lane_type(gtr_phy, phy_type, phy_instance);
+ if (ret < 0) {
+ dev_err(gtr_dev->dev, "Invalid PHY type and/or instance\n");
+ return ERR_PTR(ret);
+ }
+
+ refclk = args->args[3];
+ if (refclk >= ARRAY_SIZE(gtr_dev->refclk_sscs) ||
+ !gtr_dev->refclk_sscs[refclk]) {
+ dev_err(dev, "Invalid reference clock number %u\n", refclk);
+ return ERR_PTR(-EINVAL);
+ }
+
+ gtr_phy->refclk = refclk;
+
+ /*
+ * Ensure that the Interconnect Matrix is obeyed, i.e a given lane type
+ * is allowed to operate on the lane.
+ */
+ for (i = 0; i < CONTROLLERS_PER_LANE; i++) {
+ if (icm_matrix[phy_lane][i] == gtr_phy->type)
+ return gtr_phy->phy;
+ }
+
+ return ERR_PTR(-EINVAL);
+}
+
+/*
+ * Power Management
+ */
+
+#ifdef CONFIG_PM
+static int xpsgtr_suspend(struct device *dev)
+{
+ struct xpsgtr_dev *gtr_dev = dev_get_drvdata(dev);
+
+ /* Save the snapshot ICM_CFG registers. */
+ gtr_dev->saved_icm_cfg0 = xpsgtr_read(gtr_dev, ICM_CFG0);
+ gtr_dev->saved_icm_cfg1 = xpsgtr_read(gtr_dev, ICM_CFG1);
+
+ return 0;
+}
+
+static int xpsgtr_resume(struct device *dev)
+{
+ struct xpsgtr_dev *gtr_dev = dev_get_drvdata(dev);
+ unsigned int icm_cfg0, icm_cfg1;
+ unsigned int i;
+ bool skip_phy_init;
+
+ icm_cfg0 = xpsgtr_read(gtr_dev, ICM_CFG0);
+ icm_cfg1 = xpsgtr_read(gtr_dev, 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;
+
+ /* Update the skip_phy_init for all gtr_phy instances. */
+ for (i = 0; i < ARRAY_SIZE(gtr_dev->phys); i++)
+ gtr_dev->phys[i].skip_phy_init = skip_phy_init;
+
+ return 0;
+}
+#endif /* CONFIG_PM */
+
+static const struct dev_pm_ops xpsgtr_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(xpsgtr_suspend, xpsgtr_resume)
+};
+
+/*
+ * Probe & Platform Driver
+ */
+
+static int xpsgtr_get_ref_clocks(struct xpsgtr_dev *gtr_dev)
+{
+ unsigned int refclk;
+
+ for (refclk = 0; refclk < ARRAY_SIZE(gtr_dev->refclk_sscs); ++refclk) {
+ unsigned long rate;
+ unsigned int i;
+ struct clk *clk;
+ char name[8];
+
+ snprintf(name, sizeof(name), "ref%u", refclk);
+ clk = devm_clk_get_optional(gtr_dev->dev, name);
+ if (IS_ERR(clk)) {
+ if (PTR_ERR(clk) != -EPROBE_DEFER)
+ dev_err(gtr_dev->dev,
+ "Failed to get reference clock %u: %ld\n",
+ refclk, PTR_ERR(clk));
+ return PTR_ERR(clk);
+ }
+
+ if (!clk)
+ continue;
+
+ /*
+ * Get the spread spectrum (SSC) settings for the reference
+ * clock rate.
+ */
+ rate = clk_get_rate(clk);
+
+ for (i = 0 ; i < ARRAY_SIZE(ssc_lookup); i++) {
+ if (rate == ssc_lookup[i].refclk_rate) {
+ gtr_dev->refclk_sscs[refclk] = &ssc_lookup[i];
+ break;
+ }
+ }
+
+ if (i == ARRAY_SIZE(ssc_lookup)) {
+ dev_err(gtr_dev->dev,
+ "Invalid rate %lu for reference clock %u\n",
+ rate, refclk);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static int xpsgtr_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct xpsgtr_dev *gtr_dev;
+ struct phy_provider *provider;
+ unsigned int port;
+ int ret;
+
+ gtr_dev = devm_kzalloc(&pdev->dev, sizeof(*gtr_dev), GFP_KERNEL);
+ if (!gtr_dev)
+ 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");
+
+ /* Acquire resources. */
+ gtr_dev->serdes = devm_platform_ioremap_resource_byname(pdev, "serdes");
+ if (IS_ERR(gtr_dev->serdes))
+ return PTR_ERR(gtr_dev->serdes);
+
+ gtr_dev->siou = devm_platform_ioremap_resource_byname(pdev, "siou");
+ if (IS_ERR(gtr_dev->siou))
+ return PTR_ERR(gtr_dev->siou);
+
+ ret = xpsgtr_get_ref_clocks(gtr_dev);
+ if (ret)
+ return ret;
+
+ /* Create PHYs. */
+ for (port = 0; port < ARRAY_SIZE(gtr_dev->phys); ++port) {
+ struct xpsgtr_phy *gtr_phy = >r_dev->phys[port];
+ struct phy *phy;
+
+ gtr_phy->lane = port;
+ gtr_phy->dev = gtr_dev;
+
+ phy = devm_phy_create(&pdev->dev, np, &xpsgtr_phyops);
+ if (IS_ERR(phy)) {
+ dev_err(&pdev->dev, "failed to create PHY\n");
+ return PTR_ERR(phy);
+ }
+
+ gtr_phy->phy = phy;
+ phy_set_drvdata(phy, gtr_phy);
+ }
+
+ /* Register the PHY provider. */
+ 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;
+}
+
+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");
projects / platform / kernel / linux-rpi.git / commitdiff