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path: root/drivers/phy/qualcomm/phy-qcom-m31.c
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Diffstat (limited to 'drivers/phy/qualcomm/phy-qcom-m31.c')
-rw-r--r--drivers/phy/qualcomm/phy-qcom-m31.c294
1 files changed, 294 insertions, 0 deletions
diff --git a/drivers/phy/qualcomm/phy-qcom-m31.c b/drivers/phy/qualcomm/phy-qcom-m31.c
new file mode 100644
index 000000000000..ed08072ca032
--- /dev/null
+++ b/drivers/phy/qualcomm/phy-qcom-m31.c
@@ -0,0 +1,294 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2014-2023, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/err.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/reset.h>
+#include <linux/slab.h>
+
+#define USB2PHY_PORT_UTMI_CTRL1 0x40
+
+#define USB2PHY_PORT_UTMI_CTRL2 0x44
+ #define UTMI_ULPI_SEL BIT(7)
+ #define UTMI_TEST_MUX_SEL BIT(6)
+
+#define HS_PHY_CTRL_REG 0x10
+ #define UTMI_OTG_VBUS_VALID BIT(20)
+ #define SW_SESSVLD_SEL BIT(28)
+
+#define USB_PHY_UTMI_CTRL0 0x3c
+
+#define USB_PHY_UTMI_CTRL5 0x50
+ #define POR_EN BIT(1)
+
+#define USB_PHY_HS_PHY_CTRL_COMMON0 0x54
+ #define COMMONONN BIT(7)
+ #define FSEL BIT(4)
+ #define RETENABLEN BIT(3)
+ #define FREQ_24MHZ (BIT(6) | BIT(4))
+
+#define USB_PHY_HS_PHY_CTRL2 0x64
+ #define USB2_SUSPEND_N_SEL BIT(3)
+ #define USB2_SUSPEND_N BIT(2)
+ #define USB2_UTMI_CLK_EN BIT(1)
+
+#define USB_PHY_CFG0 0x94
+ #define UTMI_PHY_OVERRIDE_EN BIT(1)
+
+#define USB_PHY_REFCLK_CTRL 0xa0
+ #define CLKCORE BIT(1)
+
+#define USB2PHY_PORT_POWERDOWN 0xa4
+ #define POWER_UP BIT(0)
+ #define POWER_DOWN 0
+
+#define USB_PHY_FSEL_SEL 0xb8
+ #define FREQ_SEL BIT(0)
+
+#define USB2PHY_USB_PHY_M31_XCFGI_1 0xbc
+ #define USB2_0_TX_ENABLE BIT(2)
+
+#define USB2PHY_USB_PHY_M31_XCFGI_4 0xc8
+ #define HSTX_SLEW_RATE_565PS GENMASK(1, 0)
+ #define PLL_CHARGING_PUMP_CURRENT_35UA GENMASK(4, 3)
+ #define ODT_VALUE_38_02_OHM GENMASK(7, 6)
+
+#define USB2PHY_USB_PHY_M31_XCFGI_5 0xcc
+ #define ODT_VALUE_45_02_OHM BIT(2)
+ #define HSTX_PRE_EMPHASIS_LEVEL_0_55MA BIT(0)
+
+#define USB2PHY_USB_PHY_M31_XCFGI_11 0xe4
+ #define XCFG_COARSE_TUNE_NUM BIT(1)
+ #define XCFG_FINE_TUNE_NUM BIT(3)
+
+struct m31_phy_regs {
+ u32 off;
+ u32 val;
+ u32 delay;
+};
+
+struct m31_priv_data {
+ bool ulpi_mode;
+ const struct m31_phy_regs *regs;
+ unsigned int nregs;
+};
+
+struct m31_phy_regs m31_ipq5332_regs[] = {
+ {
+ USB_PHY_CFG0,
+ UTMI_PHY_OVERRIDE_EN,
+ 0
+ },
+ {
+ USB_PHY_UTMI_CTRL5,
+ POR_EN,
+ 15
+ },
+ {
+ USB_PHY_FSEL_SEL,
+ FREQ_SEL,
+ 0
+ },
+ {
+ USB_PHY_HS_PHY_CTRL_COMMON0,
+ COMMONONN | FREQ_24MHZ | RETENABLEN,
+ 0
+ },
+ {
+ USB_PHY_UTMI_CTRL5,
+ POR_EN,
+ 0
+ },
+ {
+ USB_PHY_HS_PHY_CTRL2,
+ USB2_SUSPEND_N_SEL | USB2_SUSPEND_N | USB2_UTMI_CLK_EN,
+ 0
+ },
+ {
+ USB2PHY_USB_PHY_M31_XCFGI_11,
+ XCFG_COARSE_TUNE_NUM | XCFG_FINE_TUNE_NUM,
+ 0
+ },
+ {
+ USB2PHY_USB_PHY_M31_XCFGI_4,
+ HSTX_SLEW_RATE_565PS | PLL_CHARGING_PUMP_CURRENT_35UA | ODT_VALUE_38_02_OHM,
+ 0
+ },
+ {
+ USB2PHY_USB_PHY_M31_XCFGI_1,
+ USB2_0_TX_ENABLE,
+ 0
+ },
+ {
+ USB2PHY_USB_PHY_M31_XCFGI_5,
+ ODT_VALUE_45_02_OHM | HSTX_PRE_EMPHASIS_LEVEL_0_55MA,
+ 4
+ },
+ {
+ USB_PHY_UTMI_CTRL5,
+ 0x0,
+ 0
+ },
+ {
+ USB_PHY_HS_PHY_CTRL2,
+ USB2_SUSPEND_N | USB2_UTMI_CLK_EN,
+ 0
+ },
+};
+
+struct m31usb_phy {
+ struct phy *phy;
+ void __iomem *base;
+ const struct m31_phy_regs *regs;
+ int nregs;
+
+ struct regulator *vreg;
+ struct clk *clk;
+ struct reset_control *reset;
+
+ bool ulpi_mode;
+};
+
+static int m31usb_phy_init(struct phy *phy)
+{
+ struct m31usb_phy *qphy = phy_get_drvdata(phy);
+ const struct m31_phy_regs *regs = qphy->regs;
+ int i, ret;
+
+ ret = regulator_enable(qphy->vreg);
+ if (ret) {
+ dev_err(&phy->dev, "failed to enable regulator, %d\n", ret);
+ return ret;
+ }
+
+ ret = clk_prepare_enable(qphy->clk);
+ if (ret) {
+ if (qphy->vreg)
+ regulator_disable(qphy->vreg);
+ dev_err(&phy->dev, "failed to enable cfg ahb clock, %d\n", ret);
+ return ret;
+ }
+
+ /* Perform phy reset */
+ reset_control_assert(qphy->reset);
+ udelay(5);
+ reset_control_deassert(qphy->reset);
+
+ /* configure for ULPI mode if requested */
+ if (qphy->ulpi_mode)
+ writel(0x0, qphy->base + USB2PHY_PORT_UTMI_CTRL2);
+
+ /* Enable the PHY */
+ writel(POWER_UP, qphy->base + USB2PHY_PORT_POWERDOWN);
+
+ /* Turn on phy ref clock */
+ for (i = 0; i < qphy->nregs; i++) {
+ writel(regs[i].val, qphy->base + regs[i].off);
+ if (regs[i].delay)
+ udelay(regs[i].delay);
+ }
+
+ return 0;
+}
+
+static int m31usb_phy_shutdown(struct phy *phy)
+{
+ struct m31usb_phy *qphy = phy_get_drvdata(phy);
+
+ /* Disable the PHY */
+ writel_relaxed(POWER_DOWN, qphy->base + USB2PHY_PORT_POWERDOWN);
+
+ clk_disable_unprepare(qphy->clk);
+
+ regulator_disable(qphy->vreg);
+
+ return 0;
+}
+
+static const struct phy_ops m31usb_phy_gen_ops = {
+ .power_on = m31usb_phy_init,
+ .power_off = m31usb_phy_shutdown,
+ .owner = THIS_MODULE,
+};
+
+static int m31usb_phy_probe(struct platform_device *pdev)
+{
+ struct phy_provider *phy_provider;
+ const struct m31_priv_data *data;
+ struct device *dev = &pdev->dev;
+ struct m31usb_phy *qphy;
+
+ qphy = devm_kzalloc(dev, sizeof(*qphy), GFP_KERNEL);
+ if (!qphy)
+ return -ENOMEM;
+
+ qphy->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(qphy->base))
+ return PTR_ERR(qphy->base);
+
+ qphy->reset = devm_reset_control_get_exclusive_by_index(dev, 0);
+ if (IS_ERR(qphy->reset))
+ return PTR_ERR(qphy->reset);
+
+ qphy->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(qphy->clk))
+ return dev_err_probe(dev, PTR_ERR(qphy->clk),
+ "failed to get clk\n");
+
+ data = of_device_get_match_data(dev);
+ qphy->regs = data->regs;
+ qphy->nregs = data->nregs;
+ qphy->ulpi_mode = data->ulpi_mode;
+
+ qphy->phy = devm_phy_create(dev, NULL, &m31usb_phy_gen_ops);
+ if (IS_ERR(qphy->phy))
+ return dev_err_probe(dev, PTR_ERR(qphy->phy),
+ "failed to create phy\n");
+
+ qphy->vreg = devm_regulator_get(dev, "vdda-phy");
+ if (IS_ERR(qphy->vreg))
+ return dev_err_probe(dev, PTR_ERR(qphy->phy),
+ "failed to get vreg\n");
+
+ phy_set_drvdata(qphy->phy, qphy);
+
+ phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+ if (!IS_ERR(phy_provider))
+ dev_info(dev, "Registered M31 USB phy\n");
+
+ return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static const struct m31_priv_data m31_ipq5332_data = {
+ .ulpi_mode = false,
+ .regs = m31_ipq5332_regs,
+ .nregs = ARRAY_SIZE(m31_ipq5332_regs),
+};
+
+static const struct of_device_id m31usb_phy_id_table[] = {
+ { .compatible = "qcom,ipq5332-usb-hsphy", .data = &m31_ipq5332_data },
+ { },
+};
+MODULE_DEVICE_TABLE(of, m31usb_phy_id_table);
+
+static struct platform_driver m31usb_phy_driver = {
+ .probe = m31usb_phy_probe,
+ .driver = {
+ .name = "qcom-m31usb-phy",
+ .of_match_table = m31usb_phy_id_table,
+ },
+};
+
+module_platform_driver(m31usb_phy_driver);
+
+MODULE_DESCRIPTION("USB2 Qualcomm M31 HSPHY driver");
+MODULE_LICENSE("GPL");