// SPDX-License-Identifier: GPL-2.0-only
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
#include <linux/bitfield.h>
/* USB QSCRATCH Hardware registers */
#define QSCRATCH_GENERAL_CFG (0x08)
#define HSUSB_PHY_CTRL_REG (0x10)
/* PHY_CTRL_REG */
#define HSUSB_CTRL_DMSEHV_CLAMP BIT(24)
#define HSUSB_CTRL_USB2_SUSPEND BIT(23)
#define HSUSB_CTRL_UTMI_CLK_EN BIT(21)
#define HSUSB_CTRL_UTMI_OTG_VBUS_VALID BIT(20)
#define HSUSB_CTRL_USE_CLKCORE BIT(18)
#define HSUSB_CTRL_DPSEHV_CLAMP BIT(17)
#define HSUSB_CTRL_COMMONONN BIT(11)
#define HSUSB_CTRL_ID_HV_CLAMP BIT(9)
#define HSUSB_CTRL_OTGSESSVLD_CLAMP BIT(8)
#define HSUSB_CTRL_CLAMP_EN BIT(7)
#define HSUSB_CTRL_RETENABLEN BIT(1)
#define HSUSB_CTRL_POR BIT(0)
/* QSCRATCH_GENERAL_CFG */
#define HSUSB_GCFG_XHCI_REV BIT(2)
/* USB QSCRATCH Hardware registers */
#define SSUSB_PHY_CTRL_REG (0x00)
#define SSUSB_PHY_PARAM_CTRL_1 (0x04)
#define SSUSB_PHY_PARAM_CTRL_2 (0x08)
#define CR_PROTOCOL_DATA_IN_REG (0x0c)
#define CR_PROTOCOL_DATA_OUT_REG (0x10)
#define CR_PROTOCOL_CAP_ADDR_REG (0x14)
#define CR_PROTOCOL_CAP_DATA_REG (0x18)
#define CR_PROTOCOL_READ_REG (0x1c)
#define CR_PROTOCOL_WRITE_REG (0x20)
/* PHY_CTRL_REG */
#define SSUSB_CTRL_REF_USE_PAD BIT(28)
#define SSUSB_CTRL_TEST_POWERDOWN BIT(27)
#define SSUSB_CTRL_LANE0_PWR_PRESENT BIT(24)
#define SSUSB_CTRL_SS_PHY_EN BIT(8)
#define SSUSB_CTRL_SS_PHY_RESET BIT(7)
/* SSPHY control registers - Does this need 0x30? */
#define SSPHY_CTRL_RX_OVRD_IN_HI(lane) (0x1006 + 0x100 * (lane))
#define SSPHY_CTRL_TX_OVRD_DRV_LO(lane) (0x1002 + 0x100 * (lane))
/* SSPHY SoC version specific values */
#define SSPHY_RX_EQ_VALUE 4 /* Override value for rx_eq */
/* Override value for transmit preemphasis */
#define SSPHY_TX_DEEMPH_3_5DB 23
/* Override value for mpll */
#define SSPHY_MPLL_VALUE 0
/* QSCRATCH PHY_PARAM_CTRL1 fields */
#define PHY_PARAM_CTRL1_TX_FULL_SWING_MASK GENMASK(26, 19)
#define PHY_PARAM_CTRL1_TX_DEEMPH_6DB_MASK GENMASK(19, 13)
#define PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB_MASK GENMASK(13, 7)
#define PHY_PARAM_CTRL1_LOS_BIAS_MASK GENMASK(7, 2)
#define PHY_PARAM_CTRL1_MASK \
(PHY_PARAM_CTRL1_TX_FULL_SWING_MASK | \
PHY_PARAM_CTRL1_TX_DEEMPH_6DB_MASK | \
PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB_MASK | \
PHY_PARAM_CTRL1_LOS_BIAS_MASK)
#define PHY_PARAM_CTRL1_TX_FULL_SWING(x) \
FIELD_PREP(PHY_PARAM_CTRL1_TX_FULL_SWING_MASK, (x))
#define PHY_PARAM_CTRL1_TX_DEEMPH_6DB(x) \
FIELD_PREP(PHY_PARAM_CTRL1_TX_DEEMPH_6DB_MASK, (x))
#define PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB(x) \
FIELD_PREP(PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB_MASK, x)
#define PHY_PARAM_CTRL1_LOS_BIAS(x) \
FIELD_PREP(PHY_PARAM_CTRL1_LOS_BIAS_MASK, (x))
/* RX OVRD IN HI bits */
#define RX_OVRD_IN_HI_RX_RESET_OVRD BIT(13)
#define RX_OVRD_IN_HI_RX_RX_RESET BIT(12)
#define RX_OVRD_IN_HI_RX_EQ_OVRD BIT(11)
#define RX_OVRD_IN_HI_RX_EQ_MASK GENMASK(10, 7)
#define RX_OVRD_IN_HI_RX_EQ(x) FIELD_PREP(RX_OVRD_IN_HI_RX_EQ_MASK, (x))
#define RX_OVRD_IN_HI_RX_EQ_EN_OVRD BIT(7)
#define RX_OVRD_IN_HI_RX_EQ_EN BIT(6)
#define RX_OVRD_IN_HI_RX_LOS_FILTER_OVRD BIT(5)
#define RX_OVRD_IN_HI_RX_LOS_FILTER_MASK GENMASK(4, 2)
#define RX_OVRD_IN_HI_RX_RATE_OVRD BIT(2)
#define RX_OVRD_IN_HI_RX_RATE_MASK GENMASK(2, 0)
/* TX OVRD DRV LO register bits */
#define TX_OVRD_DRV_LO_AMPLITUDE_MASK GENMASK(6, 0)
#define TX_OVRD_DRV_LO_PREEMPH_MASK GENMASK(13, 6)
#define TX_OVRD_DRV_LO_PREEMPH(x) ((x) << 7)
#define TX_OVRD_DRV_LO_EN BIT(14)
/* MPLL bits */
#define SSPHY_MPLL_MASK GENMASK(8, 5)
#define SSPHY_MPLL(x) ((x) << 5)
/* SS CAP register bits */
#define SS_CR_CAP_ADDR_REG BIT(0)
#define SS_CR_CAP_DATA_REG BIT(0)
#define SS_CR_READ_REG BIT(0)
#define SS_CR_WRITE_REG BIT(0)
#define LATCH_SLEEP 40
#define LATCH_TIMEOUT 100
struct usb_phy {
void __iomem *base;
struct device *dev;
struct clk *xo_clk;
struct clk *ref_clk;
u32 rx_eq;
u32 tx_deamp_3_5db;
u32 mpll;
};
struct phy_drvdata {
struct phy_ops ops;
u32 clk_rate;
};
/**
* usb_phy_write_readback() - Write register and read back masked value to
* confirm it is written
*
* @phy_dwc3: QCOM DWC3 phy context
* @offset: register offset.
* @mask: register bitmask specifying what should be updated
* @val: value to write.
*/
static inline void usb_phy_write_readback(struct usb_phy *phy_dwc3,
u32 offset,
const u32 mask, u32 val)
{
u32 write_val, tmp = readl(phy_dwc3->base + offset);
tmp &= ~mask; /* retain other bits */
write_val = tmp | val;
writel(write_val, phy_dwc3->base + offset);
/* Read back to see if val was written */
tmp = readl(phy_dwc3->base + offset);
tmp &= mask; /* clear other bits */
if (tmp != val)
dev_err(phy_dwc3->dev, "write: %x to QSCRATCH: %x FAILED\n", val, offset);
}
static int wait_for_latch(void __iomem *addr)
{
u32 val;
return readl_poll_timeout(addr, val, !val, LATCH_SLEEP, LATCH_TIMEOUT);
}
/**
* usb_ss_write_phycreg() - Write SSPHY register
*
* @phy_dwc3: QCOM DWC3 phy context
* @addr: SSPHY address to write.
* @val: value to write.
*/
static int usb_ss_write_phycreg(struct usb_phy *phy_dwc3,
u32 addr, u32 val)
{
int ret;
writel(addr, phy_dwc3->base + CR_PROTOCOL_DATA_IN_REG);
writel(SS_CR_CAP_ADDR_REG,
phy_dwc3->base + CR_PROTOCOL_CAP_ADDR_REG);
ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_CAP_ADDR_REG);
if (ret)
goto err_wait;
writel(val, phy_dwc3->base + CR_PROTOCOL_DATA_IN_REG);
writel(SS_CR_CAP_DATA_REG,
phy_dwc3->base + CR_PROTOCOL_CAP_DATA_REG);
ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_CAP_DATA_REG);
if (ret)
goto err_wait;
writel(SS_CR_WRITE_REG, phy_dwc3->base + CR_PROTOCOL_WRITE_REG);
ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_WRITE_REG);
err_wait:
if (ret)
dev_err(phy_dwc3->dev, "timeout waiting for latch\n");
return ret;
}
/**
* usb_ss_read_phycreg() - Read SSPHY register.
*
* @phy_dwc3: QCOM DWC3 phy context
* @addr: SSPHY address to read.
* @val: pointer in which read is store.
*/
static int usb_ss_read_phycreg(struct usb_phy *phy_dwc3,
u32 addr, u32 *val)
{
int ret;
writel(addr, phy_dwc3->base + CR_PROTOCOL_DATA_IN_REG);
writel(SS_CR_CAP_ADDR_REG,
phy_dwc3->base + CR_PROTOCOL_CAP_ADDR_REG);
ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_CAP_ADDR_REG);
if (ret)
goto err_wait;
/*
* Due to hardware bug, first read of SSPHY register might be
* incorrect. Hence as workaround, SW should perform SSPHY register
* read twice, but use only second read and ignore first read.
*/
writel(SS_CR_READ_REG, phy_dwc3->base + CR_PROTOCOL_READ_REG);
ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_READ_REG);
if (ret)
goto err_wait;
/* throwaway read */
readl(phy_dwc3->base + CR_PROTOCOL_DATA_OUT_REG);
writel(SS_CR_READ_REG, phy_dwc3->base + CR_PROTOCOL_READ_REG);
ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_READ_REG);
if (ret)
goto err_wait;
*val = readl(phy_dwc3->base + CR_PROTOCOL_DATA_OUT_REG);
err_wait:
return ret;
}
static int qcom_ipq806x_usb_hs_phy_init(struct phy *phy)
{
struct usb_phy *phy_dwc3 = phy_get_drvdata(phy);
int ret;
u32 val;
ret = clk_prepare_enable(phy_dwc3->xo_clk);
if (ret)
return ret;
ret = clk_prepare_enable(phy_dwc3->ref_clk);
if (ret) {
clk_disable_unprepare(phy_dwc3->xo_clk);
return ret;
}
/*
* HSPHY Initialization: Enable UTMI clock, select 19.2MHz fsel
* enable clamping, and disable RETENTION (power-on default is ENABLED)
*/
val = HSUSB_CTRL_DPSEHV_CLAMP | HSUSB_CTRL_DMSEHV_CLAMP |
HSUSB_CTRL_RETENABLEN | HSUSB_CTRL_COMMONONN |
HSUSB_CTRL_OTGSESSVLD_CLAMP | HSUSB_CTRL_ID_HV_CLAMP |
HSUSB_CTRL_UTMI_OTG_VBUS_VALID | HSUSB_CTRL_UTMI_CLK_EN |
HSUSB_CTRL_CLAMP_EN | 0x70;
/* use core clock if external reference is not present */
if (!phy_dwc3->xo_clk)
val |= HSUSB_CTRL_USE_CLKCORE;
writel(val, phy_dwc3->base + HSUSB_PHY_CTRL_REG);
usleep_range(2000, 2200);
/* Disable (bypass) VBUS and ID filters */
writel(HSUSB_GCFG_XHCI_REV, phy_dwc3->base + QSCRATCH_GENERAL_CFG);
return 0;
}
static int qcom_ipq806x_usb_hs_phy_exit(struct phy *phy)
{
struct usb_phy *phy_dwc3 = phy_get_drvdata(phy);
clk_disable_unprepare(phy_dwc3->ref_clk);
clk_disable_unprepare(phy_dwc3->xo_clk);
return 0;
}
static int qcom_ipq806x_usb_ss_phy_init(struct phy *phy)
{
struct usb_phy *phy_dwc3 = phy_get_drvdata(phy);
int ret;
u32 data;
ret = clk_prepare_enable(phy_dwc3->xo_clk);
if (ret)
return ret;
ret = clk_prepare_enable(phy_dwc3->ref_clk);
if (ret) {
clk_disable_unprepare(phy_dwc3->xo_clk);
return ret;
}
/* reset phy */
data = readl(phy_dwc3->base + SSUSB_PHY_CTRL_REG);
writel(data | SSUSB_CTRL_SS_PHY_RESET,
phy_dwc3->base + SSUSB_PHY_CTRL_REG);
usleep_range(2000, 2200);
writel(data, phy_dwc3->base + SSUSB_PHY_CTRL_REG);
/* clear REF_PAD if we don't have XO clk */
if (!phy_dwc3->xo_clk)
data &= ~SSUSB_CTRL_REF_USE_PAD;
else
data |= SSUSB_CTRL_REF_USE_PAD;
writel(data, phy_dwc3->base + SSUSB_PHY_CTRL_REG);
/* wait for ref clk to become stable, this can take up to 30ms */
msleep(30);
data |= SSUSB_CTRL_SS_PHY_EN | SSUSB_CTRL_LANE0_PWR_PRESENT;
writel(data, phy_dwc3->base + SSUSB_PHY_CTRL_REG);
/*
* WORKAROUND: There is SSPHY suspend bug due to which USB enumerates
* in HS mode instead of SS mode. Workaround it by asserting
* LANE0.TX_ALT_BLOCK.EN_ALT_BUS to enable TX to use alt bus mode
*/
ret = usb_ss_read_phycreg(phy_dwc3, 0x102D, &data);
if (ret)
goto err_phy_trans;
data |= (1 << 7);
ret = usb_ss_write_phycreg(phy_dwc3, 0x102D, data);
if (ret)
goto err_phy_trans;
ret = usb_ss_read_phycreg(phy_dwc3, 0x1010, &data);
if (ret)
goto err_phy_trans;
data &= ~0xff0;
data |= 0x20;
ret = usb_ss_write_phycreg(phy_dwc3, 0x1010, data);
if (ret)
goto err_phy_trans;
/*
* Fix RX Equalization setting as follows
* LANE0.RX_OVRD_IN_HI. RX_EQ_EN set to 0
* LANE0.RX_OVRD_IN_HI.RX_EQ_EN_OVRD set to 1
* LANE0.RX_OVRD_IN_HI.RX_EQ set based on SoC version
* LANE0.RX_OVRD_IN_HI.RX_EQ_OVRD set to 1
*/
ret = usb_ss_read_phycreg(phy_dwc3, SSPHY_CTRL_RX_OVRD_IN_HI(0), &data);
if (ret)
goto err_phy_trans;
data &= ~RX_OVRD_IN_HI_RX_EQ_EN;
data |= RX_OVRD_IN_HI_RX_EQ_EN_OVRD;
data &= ~RX_OVRD_IN_HI_RX_EQ_MASK;
data |= RX_OVRD_IN_HI_RX_EQ(phy_dwc3->rx_eq);
data |= RX_OVRD_IN_HI_RX_EQ_OVRD;
ret = usb_ss_write_phycreg(phy_dwc3,
SSPHY_CTRL_RX_OVRD_IN_HI(0), data);
if (ret)
goto err_phy_trans;
/*
* Set EQ and TX launch amplitudes as follows
* LANE0.TX_OVRD_DRV_LO.PREEMPH set based on SoC version
* LANE0.TX_OVRD_DRV_LO.AMPLITUDE set to 110
* LANE0.TX_OVRD_DRV_LO.EN set to 1.
*/
ret = usb_ss_read_phycreg(phy_dwc3,
SSPHY_CTRL_TX_OVRD_DRV_LO(0), &data);
if (ret)
goto err_phy_trans;
data &= ~TX_OVRD_DRV_LO_PREEMPH_MASK;
data |= TX_OVRD_DRV_LO_PREEMPH(phy_dwc3->tx_deamp_3_5db);
data &= ~TX_OVRD_DRV_LO_AMPLITUDE_MASK;
data |= 0x6E;
data |= TX_OVRD_DRV_LO_EN;
ret = usb_ss_write_phycreg(phy_dwc3,
SSPHY_CTRL_TX_OVRD_DRV_LO(0), data);
if (ret)
goto err_phy_trans;
data = 0;
data &= ~SSPHY_MPLL_MASK;
data |= SSPHY_MPLL(phy_dwc3->mpll);
usb_ss_write_phycreg(phy_dwc3, 0x30, data);
/*
* Set the QSCRATCH PHY_PARAM_CTRL1 parameters as follows
* TX_FULL_SWING [26:20] amplitude to 110
* TX_DEEMPH_6DB [19:14] to 32
* TX_DEEMPH_3_5DB [13:8] set based on SoC version
* LOS_BIAS [7:3] to 9
*/
data = readl(phy_dwc3->base + SSUSB_PHY_PARAM_CTRL_1);
data &= ~PHY_PARAM_CTRL1_MASK;
data |= PHY_PARAM_CTRL1_TX_FULL_SWING(0x6e) |
PHY_PARAM_CTRL1_TX_DEEMPH_6DB(0x20) |
PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB(phy_dwc3->tx_deamp_3_5db) |
PHY_PARAM_CTRL1_LOS_BIAS(0x9);
usb_phy_write_readback(phy_dwc3, SSUSB_PHY_PARAM_CTRL_1,
PHY_PARAM_CTRL1_MASK, data);
err_phy_trans:
return ret;
}
static int qcom_ipq806x_usb_ss_phy_exit(struct phy *phy)
{
struct usb_phy *phy_dwc3 = phy_get_drvdata(phy);
/* Sequence to put SSPHY in low power state:
* 1. Clear REF_PHY_EN in PHY_CTRL_REG
* 2. Clear REF_USE_PAD in PHY_CTRL_REG
* 3. Set TEST_POWERED_DOWN in PHY_CTRL_REG to enable PHY retention
*/
usb_phy_write_readback(phy_dwc3, SSUSB_PHY_CTRL_REG,
SSUSB_CTRL_SS_PHY_EN, 0x0);
usb_phy_write_readback(phy_dwc3, SSUSB_PHY_CTRL_REG,
SSUSB_CTRL_REF_USE_PAD, 0x0);
usb_phy_write_readback(phy_dwc3, SSUSB_PHY_CTRL_REG,
SSUSB_CTRL_TEST_POWERDOWN, 0x0);
clk_disable_unprepare(phy_dwc3->ref_clk);
clk_disable_unprepare(phy_dwc3->xo_clk);
return 0;
}
static const struct phy_drvdata qcom_ipq806x_usb_hs_drvdata = {
.ops = {
.init = qcom_ipq806x_usb_hs_phy_init,
.exit = qcom_ipq806x_usb_hs_phy_exit,
.owner = THIS_MODULE,
},
.clk_rate = 60000000,
};
static const struct phy_drvdata qcom_ipq806x_usb_ss_drvdata = {
.ops = {
.init = qcom_ipq806x_usb_ss_phy_init,
.exit = qcom_ipq806x_usb_ss_phy_exit,
.owner = THIS_MODULE,
},
.clk_rate = 125000000,
};
static const struct of_device_id qcom_ipq806x_usb_phy_table[] = {
{ .compatible = "qcom,ipq806x-usb-phy-hs",
.data = &qcom_ipq806x_usb_hs_drvdata },
{ .compatible = "qcom,ipq806x-usb-phy-ss",
.data = &qcom_ipq806x_usb_ss_drvdata },
{ /* Sentinel */ }
};
MODULE_DEVICE_TABLE(of, qcom_ipq806x_usb_phy_table);
static int qcom_ipq806x_usb_phy_probe(struct platform_device *pdev)
{
struct resource *res;
resource_size_t size;
struct phy *generic_phy;
struct usb_phy *phy_dwc3;
const struct phy_drvdata *data;
struct phy_provider *phy_provider;
phy_dwc3 = devm_kzalloc(&pdev->dev, sizeof(*phy_dwc3), GFP_KERNEL);
if (!phy_dwc3)
return -ENOMEM;
data = of_device_get_match_data(&pdev->dev);
phy_dwc3->dev = &pdev->dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -EINVAL;
size = resource_size(res);
phy_dwc3->base = devm_ioremap(phy_dwc3->dev, res->start, size);
if (!phy_dwc3->base) {
dev_err(phy_dwc3->dev, "failed to map reg\n");
return -ENOMEM;
}
phy_dwc3->ref_clk = devm_clk_get(phy_dwc3->dev, "ref");
if (IS_ERR(phy_dwc3->ref_clk)) {
dev_dbg(phy_dwc3->dev, "cannot get reference clock\n");
return PTR_ERR(phy_dwc3->ref_clk);
}
clk_set_rate(phy_dwc3->ref_clk, data->clk_rate);
phy_dwc3->xo_clk = devm_clk_get(phy_dwc3->dev, "xo");
if (IS_ERR(phy_dwc3->xo_clk)) {
dev_dbg(phy_dwc3->dev, "cannot get TCXO clock\n");
phy_dwc3->xo_clk = NULL;
}
/* Parse device node to probe HSIO settings */
if (device_property_read_u32(&pdev->dev, "qcom,rx-eq",
&phy_dwc3->rx_eq))
phy_dwc3->rx_eq = SSPHY_RX_EQ_VALUE;
if (device_property_read_u32(&pdev->dev, "qcom,tx-deamp_3_5db",
&phy_dwc3->tx_deamp_3_5db))
phy_dwc3->tx_deamp_3_5db = SSPHY_TX_DEEMPH_3_5DB;
if (device_property_read_u32(&pdev->dev, "qcom,mpll", &phy_dwc3->mpll))
phy_dwc3->mpll = SSPHY_MPLL_VALUE;
generic_phy = devm_phy_create(phy_dwc3->dev, pdev->dev.of_node, &data->ops);
if (IS_ERR(generic_phy))
return PTR_ERR(generic_phy);
phy_set_drvdata(generic_phy, phy_dwc3);
platform_set_drvdata(pdev, phy_dwc3);
phy_provider = devm_of_phy_provider_register(phy_dwc3->dev,
of_phy_simple_xlate);
if (IS_ERR(phy_provider))
return PTR_ERR(phy_provider);
return 0;
}
static struct platform_driver qcom_ipq806x_usb_phy_driver = {
.probe = qcom_ipq806x_usb_phy_probe,
.driver = {
.name = "qcom-ipq806x-usb-phy",
.of_match_table = qcom_ipq806x_usb_phy_table,
},
};
module_platform_driver(qcom_ipq806x_usb_phy_driver);
MODULE_ALIAS("platform:phy-qcom-ipq806x-usb");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Andy Gross <[email protected]>");
MODULE_AUTHOR("Ivan T. Ivanov <[email protected]>");
MODULE_DESCRIPTION("DesignWare USB3 QCOM PHY driver");
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