mirror of https://github.com/hak5/openwrt-owl.git
513 lines
14 KiB
Diff
513 lines
14 KiB
Diff
--- a/drivers/phy/Kconfig
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+++ b/drivers/phy/Kconfig
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@@ -390,4 +390,15 @@ config PHY_CYGNUS_PCIE
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Enable this to support the Broadcom Cygnus PCIe PHY.
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If unsure, say N.
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+config PHY_QCOM_DWC3
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+ tristate "QCOM DWC3 USB PHY support"
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+ depends on ARCH_QCOM
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+ depends on HAS_IOMEM
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+ depends on OF
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+ select GENERIC_PHY
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+ help
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+ This option enables support for the Synopsis PHYs present inside the
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+ Qualcomm USB3.0 DWC3 controller. This driver supports both HS and SS
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+ PHY controllers.
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+
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endmenu
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--- a/drivers/phy/Makefile
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+++ b/drivers/phy/Makefile
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@@ -48,3 +48,4 @@ obj-$(CONFIG_PHY_TUSB1210) += phy-tusb1
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obj-$(CONFIG_PHY_BRCMSTB_SATA) += phy-brcmstb-sata.o
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obj-$(CONFIG_PHY_PISTACHIO_USB) += phy-pistachio-usb.o
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obj-$(CONFIG_PHY_CYGNUS_PCIE) += phy-bcm-cygnus-pcie.o
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+obj-$(CONFIG_PHY_QCOM_DWC3) += phy-qcom-dwc3.o
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--- /dev/null
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+++ b/drivers/phy/phy-qcom-dwc3.c
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@@ -0,0 +1,484 @@
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+/* Copyright (c) 2014-2015, Code Aurora Forum. All rights reserved.
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 and
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+ * only version 2 as published by the Free Software Foundation.
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+ *
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+* This program is distributed in the hope that it will be useful,
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+* but WITHOUT ANY WARRANTY; without even the implied warranty of
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+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+* GNU General Public License for more details.
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+*/
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+
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+#include <linux/clk.h>
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+#include <linux/err.h>
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+#include <linux/io.h>
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+#include <linux/module.h>
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+#include <linux/of.h>
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+#include <linux/phy/phy.h>
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+#include <linux/platform_device.h>
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+#include <linux/delay.h>
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+
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+/**
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+ * USB QSCRATCH Hardware registers
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+ */
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+#define QSCRATCH_GENERAL_CFG (0x08)
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+#define HSUSB_PHY_CTRL_REG (0x10)
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+
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+/* PHY_CTRL_REG */
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+#define HSUSB_CTRL_DMSEHV_CLAMP BIT(24)
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+#define HSUSB_CTRL_USB2_SUSPEND BIT(23)
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+#define HSUSB_CTRL_UTMI_CLK_EN BIT(21)
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+#define HSUSB_CTRL_UTMI_OTG_VBUS_VALID BIT(20)
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+#define HSUSB_CTRL_USE_CLKCORE BIT(18)
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+#define HSUSB_CTRL_DPSEHV_CLAMP BIT(17)
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+#define HSUSB_CTRL_COMMONONN BIT(11)
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+#define HSUSB_CTRL_ID_HV_CLAMP BIT(9)
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+#define HSUSB_CTRL_OTGSESSVLD_CLAMP BIT(8)
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+#define HSUSB_CTRL_CLAMP_EN BIT(7)
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+#define HSUSB_CTRL_RETENABLEN BIT(1)
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+#define HSUSB_CTRL_POR BIT(0)
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+
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+/* QSCRATCH_GENERAL_CFG */
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+#define HSUSB_GCFG_XHCI_REV BIT(2)
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+
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+/**
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+ * USB QSCRATCH Hardware registers
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+ */
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+#define SSUSB_PHY_CTRL_REG (0x00)
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+#define SSUSB_PHY_PARAM_CTRL_1 (0x04)
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+#define SSUSB_PHY_PARAM_CTRL_2 (0x08)
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+#define CR_PROTOCOL_DATA_IN_REG (0x0c)
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+#define CR_PROTOCOL_DATA_OUT_REG (0x10)
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+#define CR_PROTOCOL_CAP_ADDR_REG (0x14)
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+#define CR_PROTOCOL_CAP_DATA_REG (0x18)
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+#define CR_PROTOCOL_READ_REG (0x1c)
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+#define CR_PROTOCOL_WRITE_REG (0x20)
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+
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+/* PHY_CTRL_REG */
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+#define SSUSB_CTRL_REF_USE_PAD BIT(28)
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+#define SSUSB_CTRL_TEST_POWERDOWN BIT(27)
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+#define SSUSB_CTRL_LANE0_PWR_PRESENT BIT(24)
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+#define SSUSB_CTRL_SS_PHY_EN BIT(8)
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+#define SSUSB_CTRL_SS_PHY_RESET BIT(7)
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+
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+/* SSPHY control registers */
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+#define SSPHY_CTRL_RX_OVRD_IN_HI(lane) (0x1006 + 0x100 * lane)
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+#define SSPHY_CTRL_TX_OVRD_DRV_LO(lane) (0x1002 + 0x100 * lane)
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+
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+/* RX OVRD IN HI bits */
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+#define RX_OVRD_IN_HI_RX_RESET_OVRD BIT(13)
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+#define RX_OVRD_IN_HI_RX_RX_RESET BIT(12)
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+#define RX_OVRD_IN_HI_RX_EQ_OVRD BIT(11)
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+#define RX_OVRD_IN_HI_RX_EQ_MASK 0x0700
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+#define RX_OVRD_IN_HI_RX_EQ_SHIFT 8
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+#define RX_OVRD_IN_HI_RX_EQ_EN_OVRD BIT(7)
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+#define RX_OVRD_IN_HI_RX_EQ_EN BIT(6)
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+#define RX_OVRD_IN_HI_RX_LOS_FILTER_OVRD BIT(5)
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+#define RX_OVRD_IN_HI_RX_LOS_FILTER_MASK 0x0018
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+#define RX_OVRD_IN_HI_RX_RATE_OVRD BIT(2)
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+#define RX_OVRD_IN_HI_RX_RATE_MASK 0x0003
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+
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+/* TX OVRD DRV LO register bits */
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+#define TX_OVRD_DRV_LO_AMPLITUDE_MASK 0x007F
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+#define TX_OVRD_DRV_LO_PREEMPH_MASK 0x3F80
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+#define TX_OVRD_DRV_LO_PREEMPH_SHIFT 7
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+#define TX_OVRD_DRV_LO_EN BIT(14)
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+
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+/* SS CAP register bits */
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+#define SS_CR_CAP_ADDR_REG BIT(0)
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+#define SS_CR_CAP_DATA_REG BIT(0)
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+#define SS_CR_READ_REG BIT(0)
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+#define SS_CR_WRITE_REG BIT(0)
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+
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+struct qcom_dwc3_usb_phy {
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+ void __iomem *base;
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+ struct device *dev;
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+ struct clk *xo_clk;
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+ struct clk *ref_clk;
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+};
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+
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+struct qcom_dwc3_phy_drvdata {
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+ struct phy_ops ops;
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+ u32 clk_rate;
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+};
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+
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+/**
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+ * Write register and read back masked value to confirm it is written
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+ *
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+ * @base - QCOM DWC3 PHY base virtual address.
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+ * @offset - register offset.
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+ * @mask - register bitmask specifying what should be updated
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+ * @val - value to write.
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+ */
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+static inline void qcom_dwc3_phy_write_readback(
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+ struct qcom_dwc3_usb_phy *phy_dwc3, u32 offset,
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+ const u32 mask, u32 val)
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+{
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+ u32 write_val, tmp = readl(phy_dwc3->base + offset);
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+
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+ tmp &= ~mask; /* retain other bits */
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+ write_val = tmp | val;
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+
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+ writel(write_val, phy_dwc3->base + offset);
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+
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+ /* Read back to see if val was written */
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+ tmp = readl(phy_dwc3->base + offset);
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+ tmp &= mask; /* clear other bits */
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+
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+ if (tmp != val)
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+ dev_err(phy_dwc3->dev, "write: %x to QSCRATCH: %x FAILED\n",
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+ val, offset);
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+}
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+
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+static int wait_for_latch(void __iomem *addr)
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+{
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+ u32 retry = 10;
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+
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+ while (true) {
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+ if (!readl(addr))
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+ break;
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+
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+ if (--retry == 0)
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+ return -ETIMEDOUT;
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+
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+ usleep_range(10, 20);
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+ }
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+
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+ return 0;
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+}
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+
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+/**
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+ * Write SSPHY register
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+ *
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+ * @base - QCOM DWC3 PHY base virtual address.
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+ * @addr - SSPHY address to write.
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+ * @val - value to write.
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+ */
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+static int qcom_dwc3_ss_write_phycreg(struct qcom_dwc3_usb_phy *phy_dwc3,
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+ u32 addr, u32 val)
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+{
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+ int ret;
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+
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+ writel(addr, phy_dwc3->base + CR_PROTOCOL_DATA_IN_REG);
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+ writel(SS_CR_CAP_ADDR_REG, phy_dwc3->base + CR_PROTOCOL_CAP_ADDR_REG);
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+
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+ ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_CAP_ADDR_REG);
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+ if (ret)
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+ goto err_wait;
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+
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+ writel(val, phy_dwc3->base + CR_PROTOCOL_DATA_IN_REG);
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+ writel(SS_CR_CAP_DATA_REG, phy_dwc3->base + CR_PROTOCOL_CAP_DATA_REG);
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+
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+ ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_CAP_DATA_REG);
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+ if (ret)
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+ goto err_wait;
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+
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+ writel(SS_CR_WRITE_REG, phy_dwc3->base + CR_PROTOCOL_WRITE_REG);
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+
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+ ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_WRITE_REG);
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+
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+err_wait:
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+ if (ret)
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+ dev_err(phy_dwc3->dev, "timeout waiting for latch\n");
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+ return ret;
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+}
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+
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+/**
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+ * Read SSPHY register.
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+ *
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+ * @base - QCOM DWC3 PHY base virtual address.
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+ * @addr - SSPHY address to read.
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+ */
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+static int qcom_dwc3_ss_read_phycreg(void __iomem *base, u32 addr, u32 *val)
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+{
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+ int ret;
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+
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+ writel(addr, base + CR_PROTOCOL_DATA_IN_REG);
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+ writel(SS_CR_CAP_ADDR_REG, base + CR_PROTOCOL_CAP_ADDR_REG);
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+
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+ ret = wait_for_latch(base + CR_PROTOCOL_CAP_ADDR_REG);
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+ if (ret)
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+ goto err_wait;
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+
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+ /*
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+ * Due to hardware bug, first read of SSPHY register might be
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+ * incorrect. Hence as workaround, SW should perform SSPHY register
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+ * read twice, but use only second read and ignore first read.
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+ */
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+ writel(SS_CR_READ_REG, base + CR_PROTOCOL_READ_REG);
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+
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+ ret = wait_for_latch(base + CR_PROTOCOL_READ_REG);
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+ if (ret)
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+ goto err_wait;
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+
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+ /* throwaway read */
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+ readl(base + CR_PROTOCOL_DATA_OUT_REG);
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+
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+ writel(SS_CR_READ_REG, base + CR_PROTOCOL_READ_REG);
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+
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+ ret = wait_for_latch(base + CR_PROTOCOL_READ_REG);
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+ if (ret)
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+ goto err_wait;
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+
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+ *val = readl(base + CR_PROTOCOL_DATA_OUT_REG);
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+
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+err_wait:
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+ return ret;
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+}
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+
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+static int qcom_dwc3_phy_power_on(struct phy *phy)
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+{
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+ int ret;
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+ struct qcom_dwc3_usb_phy *phy_dwc3 = phy_get_drvdata(phy);
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+
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+ ret = clk_prepare_enable(phy_dwc3->xo_clk);
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+ if (ret)
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+ return ret;
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+
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+ ret = clk_prepare_enable(phy_dwc3->ref_clk);
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+ if (ret)
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+ clk_disable_unprepare(phy_dwc3->xo_clk);
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+
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+ return ret;
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+}
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+
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+static int qcom_dwc3_phy_power_off(struct phy *phy)
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+{
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+ struct qcom_dwc3_usb_phy *phy_dwc3 = phy_get_drvdata(phy);
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+
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+ clk_disable_unprepare(phy_dwc3->ref_clk);
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+ clk_disable_unprepare(phy_dwc3->xo_clk);
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+
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+ return 0;
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+}
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+
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+static int qcom_dwc3_hs_phy_init(struct phy *phy)
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+{
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+ struct qcom_dwc3_usb_phy *phy_dwc3 = phy_get_drvdata(phy);
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+ u32 val;
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+
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+ /*
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+ * HSPHY Initialization: Enable UTMI clock, select 19.2MHz fsel
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+ * enable clamping, and disable RETENTION (power-on default is ENABLED)
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+ */
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+ val = HSUSB_CTRL_DPSEHV_CLAMP | HSUSB_CTRL_DMSEHV_CLAMP |
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+ HSUSB_CTRL_RETENABLEN | HSUSB_CTRL_COMMONONN |
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+ HSUSB_CTRL_OTGSESSVLD_CLAMP | HSUSB_CTRL_ID_HV_CLAMP |
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+ HSUSB_CTRL_DPSEHV_CLAMP | HSUSB_CTRL_UTMI_OTG_VBUS_VALID |
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+ HSUSB_CTRL_UTMI_CLK_EN | HSUSB_CTRL_CLAMP_EN | 0x70;
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+
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+ /* use core clock if external reference is not present */
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+ if (!phy_dwc3->xo_clk)
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+ val |= HSUSB_CTRL_USE_CLKCORE;
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+
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+ writel(val, phy_dwc3->base + HSUSB_PHY_CTRL_REG);
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+ usleep_range(2000, 2200);
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+
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+ /* Disable (bypass) VBUS and ID filters */
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+ writel(HSUSB_GCFG_XHCI_REV, phy_dwc3->base + QSCRATCH_GENERAL_CFG);
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+
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+ return 0;
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+}
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+
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+static int qcom_dwc3_ss_phy_init(struct phy *phy)
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+{
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+ struct qcom_dwc3_usb_phy *phy_dwc3 = phy_get_drvdata(phy);
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+ int ret;
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+ u32 data = 0;
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+
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+ /* reset phy */
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+ data = readl(phy_dwc3->base + SSUSB_PHY_CTRL_REG);
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+ writel(data | SSUSB_CTRL_SS_PHY_RESET,
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+ phy_dwc3->base + SSUSB_PHY_CTRL_REG);
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+ usleep_range(2000, 2200);
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+ writel(data, phy_dwc3->base + SSUSB_PHY_CTRL_REG);
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+
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+ /* clear REF_PAD if we don't have XO clk */
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+ if (!phy_dwc3->xo_clk)
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+ data &= ~SSUSB_CTRL_REF_USE_PAD;
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+ else
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+ data |= SSUSB_CTRL_REF_USE_PAD;
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+
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+ writel(data, phy_dwc3->base + SSUSB_PHY_CTRL_REG);
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+
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+ /* wait for ref clk to become stable, this can take up to 30ms */
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+ msleep(30);
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+
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+ data |= SSUSB_CTRL_SS_PHY_EN | SSUSB_CTRL_LANE0_PWR_PRESENT;
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+ writel(data, phy_dwc3->base + SSUSB_PHY_CTRL_REG);
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+
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+ /*
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+ * Fix RX Equalization setting as follows
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+ * LANE0.RX_OVRD_IN_HI. RX_EQ_EN set to 0
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+ * LANE0.RX_OVRD_IN_HI.RX_EQ_EN_OVRD set to 1
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+ * LANE0.RX_OVRD_IN_HI.RX_EQ set to 3
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+ * LANE0.RX_OVRD_IN_HI.RX_EQ_OVRD set to 1
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+ */
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+ ret = qcom_dwc3_ss_read_phycreg(phy_dwc3->base,
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+ SSPHY_CTRL_RX_OVRD_IN_HI(0), &data);
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+ if (ret)
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+ goto err_phy_trans;
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+
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+ data &= ~RX_OVRD_IN_HI_RX_EQ_EN;
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+ data |= RX_OVRD_IN_HI_RX_EQ_EN_OVRD;
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+ data &= ~RX_OVRD_IN_HI_RX_EQ_MASK;
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+ data |= 0x3 << RX_OVRD_IN_HI_RX_EQ_SHIFT;
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+ data |= RX_OVRD_IN_HI_RX_EQ_OVRD;
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+ ret = qcom_dwc3_ss_write_phycreg(phy_dwc3,
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+ SSPHY_CTRL_RX_OVRD_IN_HI(0), data);
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+ if (ret)
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+ goto err_phy_trans;
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+
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+ /*
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+ * Set EQ and TX launch amplitudes as follows
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+ * LANE0.TX_OVRD_DRV_LO.PREEMPH set to 22
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+ * LANE0.TX_OVRD_DRV_LO.AMPLITUDE set to 127
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+ * LANE0.TX_OVRD_DRV_LO.EN set to 1.
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+ */
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+ ret = qcom_dwc3_ss_read_phycreg(phy_dwc3->base,
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+ SSPHY_CTRL_TX_OVRD_DRV_LO(0), &data);
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+ if (ret)
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+ goto err_phy_trans;
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+
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+ data &= ~TX_OVRD_DRV_LO_PREEMPH_MASK;
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+ data |= 0x16 << TX_OVRD_DRV_LO_PREEMPH_SHIFT;
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+ data &= ~TX_OVRD_DRV_LO_AMPLITUDE_MASK;
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+ data |= 0x7f;
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+ data |= TX_OVRD_DRV_LO_EN;
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+ ret = qcom_dwc3_ss_write_phycreg(phy_dwc3,
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+ SSPHY_CTRL_TX_OVRD_DRV_LO(0), data);
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+ if (ret)
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+ goto err_phy_trans;
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+
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+ /*
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+ * Set the QSCRATCH PHY_PARAM_CTRL1 parameters as follows
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+ * TX_FULL_SWING [26:20] amplitude to 127
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+ * TX_DEEMPH_3_5DB [13:8] to 22
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+ * LOS_BIAS [2:0] to 0x5
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+ */
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+ qcom_dwc3_phy_write_readback(phy_dwc3, SSUSB_PHY_PARAM_CTRL_1,
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+ 0x07f03f07, 0x07f01605);
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+
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+err_phy_trans:
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+ return ret;
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+}
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+
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+static int qcom_dwc3_ss_phy_exit(struct phy *phy)
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+{
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+ struct qcom_dwc3_usb_phy *phy_dwc3 = phy_get_drvdata(phy);
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+
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+ /* Sequence to put SSPHY in low power state:
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+ * 1. Clear REF_PHY_EN in PHY_CTRL_REG
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+ * 2. Clear REF_USE_PAD in PHY_CTRL_REG
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+ * 3. Set TEST_POWERED_DOWN in PHY_CTRL_REG to enable PHY retention
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+ */
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+ qcom_dwc3_phy_write_readback(phy_dwc3, SSUSB_PHY_CTRL_REG,
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+ SSUSB_CTRL_SS_PHY_EN, 0x0);
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+ qcom_dwc3_phy_write_readback(phy_dwc3, SSUSB_PHY_CTRL_REG,
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+ SSUSB_CTRL_REF_USE_PAD, 0x0);
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+ qcom_dwc3_phy_write_readback(phy_dwc3, SSUSB_PHY_CTRL_REG,
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+ 0x0, SSUSB_CTRL_TEST_POWERDOWN);
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+
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+ return 0;
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+}
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+
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+static const struct qcom_dwc3_phy_drvdata qcom_dwc3_hs_drvdata = {
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+ .ops = {
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+ .init = qcom_dwc3_hs_phy_init,
|
|
+ .power_on = qcom_dwc3_phy_power_on,
|
|
+ .power_off = qcom_dwc3_phy_power_off,
|
|
+ .owner = THIS_MODULE,
|
|
+ },
|
|
+ .clk_rate = 60000000,
|
|
+};
|
|
+
|
|
+static const struct qcom_dwc3_phy_drvdata qcom_dwc3_ss_drvdata = {
|
|
+ .ops = {
|
|
+ .init = qcom_dwc3_ss_phy_init,
|
|
+ .exit = qcom_dwc3_ss_phy_exit,
|
|
+ .power_on = qcom_dwc3_phy_power_on,
|
|
+ .power_off = qcom_dwc3_phy_power_off,
|
|
+ .owner = THIS_MODULE,
|
|
+ },
|
|
+ .clk_rate = 125000000,
|
|
+};
|
|
+
|
|
+static const struct of_device_id qcom_dwc3_phy_table[] = {
|
|
+ { .compatible = "qcom,dwc3-hs-usb-phy", .data = &qcom_dwc3_hs_drvdata },
|
|
+ { .compatible = "qcom,dwc3-ss-usb-phy", .data = &qcom_dwc3_ss_drvdata },
|
|
+ { /* Sentinel */ }
|
|
+};
|
|
+MODULE_DEVICE_TABLE(of, qcom_dwc3_phy_table);
|
|
+
|
|
+static int qcom_dwc3_phy_probe(struct platform_device *pdev)
|
|
+{
|
|
+ struct qcom_dwc3_usb_phy *phy_dwc3;
|
|
+ struct phy_provider *phy_provider;
|
|
+ struct phy *generic_phy;
|
|
+ struct resource *res;
|
|
+ const struct of_device_id *match;
|
|
+ const struct qcom_dwc3_phy_drvdata *data;
|
|
+
|
|
+ phy_dwc3 = devm_kzalloc(&pdev->dev, sizeof(*phy_dwc3), GFP_KERNEL);
|
|
+ if (!phy_dwc3)
|
|
+ return -ENOMEM;
|
|
+
|
|
+ match = of_match_node(qcom_dwc3_phy_table, pdev->dev.of_node);
|
|
+ data = match->data;
|
|
+
|
|
+ phy_dwc3->dev = &pdev->dev;
|
|
+
|
|
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
+ phy_dwc3->base = devm_ioremap_resource(phy_dwc3->dev, res);
|
|
+ if (IS_ERR(phy_dwc3->base))
|
|
+ return PTR_ERR(phy_dwc3->base);
|
|
+
|
|
+ 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;
|
|
+ }
|
|
+
|
|
+ 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_dwc3_phy_driver = {
|
|
+ .probe = qcom_dwc3_phy_probe,
|
|
+ .driver = {
|
|
+ .name = "qcom-dwc3-usb-phy",
|
|
+ .owner = THIS_MODULE,
|
|
+ .of_match_table = qcom_dwc3_phy_table,
|
|
+ },
|
|
+};
|
|
+
|
|
+module_platform_driver(qcom_dwc3_phy_driver);
|
|
+
|
|
+MODULE_ALIAS("platform:phy-qcom-dwc3");
|
|
+MODULE_LICENSE("GPL v2");
|
|
+MODULE_AUTHOR("Andy Gross <agross@codeaurora.org>");
|
|
+MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>");
|
|
+MODULE_DESCRIPTION("DesignWare USB3 QCOM PHY driver");
|