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authorJohn Crispin <blogic@openwrt.org>2015-04-03 19:06:30 +0000
committerJohn Crispin <blogic@openwrt.org>2015-04-03 19:06:30 +0000
commit55bd704a1bb3c079232a502e7d94f26ddc0e701a (patch)
treec9dc3cbcd47c5a618396076ed1dbd9cf8d7d0365 /target/linux/ipq806x/patches-3.18/100-usb-phy-Add-Qualcomm-DWC3-HS-SS-PHY-drivers.patch
parent1569ab3bb05c3d9b7dacedfcfd6b0672ea5eb118 (diff)
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ipq806x: add platform usb support
This change adds DWC3 QCOM USB phys and TCSR drivers. These are cherry-picked from the following LKML threads: *dwc3 qcom: https://lkml.org/lkml/2014/9/12/599 *tcsr: https://lkml.org/lkml/2015/2/9/579 We're also adding an additional patch to add the corresponding dev nodes in the IPQ806x and AP148 dts files. Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org> git-svn-id: svn://svn.openwrt.org/openwrt/trunk@45261 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/ipq806x/patches-3.18/100-usb-phy-Add-Qualcomm-DWC3-HS-SS-PHY-drivers.patch')
-rw-r--r--target/linux/ipq806x/patches-3.18/100-usb-phy-Add-Qualcomm-DWC3-HS-SS-PHY-drivers.patch511
1 files changed, 511 insertions, 0 deletions
diff --git a/target/linux/ipq806x/patches-3.18/100-usb-phy-Add-Qualcomm-DWC3-HS-SS-PHY-drivers.patch b/target/linux/ipq806x/patches-3.18/100-usb-phy-Add-Qualcomm-DWC3-HS-SS-PHY-drivers.patch
new file mode 100644
index 0000000000..25803b88eb
--- /dev/null
+++ b/target/linux/ipq806x/patches-3.18/100-usb-phy-Add-Qualcomm-DWC3-HS-SS-PHY-drivers.patch
@@ -0,0 +1,511 @@
+--- a/drivers/phy/Kconfig
++++ b/drivers/phy/Kconfig
+@@ -256,4 +256,15 @@ config PHY_STIH41X_USB
+ Enable this to support the USB transceiver that is part of
+ STMicroelectronics STiH41x SoC series.
+
++config PHY_QCOM_DWC3
++ tristate "QCOM DWC3 USB PHY support"
++ depends on ARCH_QCOM
++ depends on HAS_IOMEM
++ depends on OF
++ select GENERIC_PHY
++ help
++ This option enables support for the Synopsis PHYs present inside the
++ Qualcomm USB3.0 DWC3 controller. This driver supports both HS and SS
++ PHY controllers.
++
+ endmenu
+--- a/drivers/phy/Makefile
++++ b/drivers/phy/Makefile
+@@ -31,3 +31,4 @@ obj-$(CONFIG_PHY_ST_SPEAR1340_MIPHY) +=
+ obj-$(CONFIG_PHY_XGENE) += phy-xgene.o
+ obj-$(CONFIG_PHY_STIH407_USB) += phy-stih407-usb.o
+ obj-$(CONFIG_PHY_STIH41X_USB) += phy-stih41x-usb.o
++obj-$(CONFIG_PHY_QCOM_DWC3) += phy-qcom-dwc3.o
+--- /dev/null
++++ b/drivers/phy/phy-qcom-dwc3.c
+@@ -0,0 +1,483 @@
++/* Copyright (c) 2013-2014, Code Aurora Forum. All rights reserved.
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 and
++ * only version 2 as published by the Free Software Foundation.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ */
++
++#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>
++
++/**
++ * 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 */
++#define SSPHY_CTRL_RX_OVRD_IN_HI(lane) (0x1006 + 0x100 * lane)
++#define SSPHY_CTRL_TX_OVRD_DRV_LO(lane) (0x1002 + 0x100 * lane)
++
++/* 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 0x0700
++#define RX_OVRD_IN_HI_RX_EQ_SHIFT 8
++#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 0x0018
++#define RX_OVRD_IN_HI_RX_RATE_OVRD BIT(2)
++#define RX_OVRD_IN_HI_RX_RATE_MASK 0x0003
++
++/* TX OVRD DRV LO register bits */
++#define TX_OVRD_DRV_LO_AMPLITUDE_MASK 0x007F
++#define TX_OVRD_DRV_LO_PREEMPH_MASK 0x3F80
++#define TX_OVRD_DRV_LO_PREEMPH_SHIFT 7
++#define TX_OVRD_DRV_LO_EN BIT(14)
++
++struct qcom_dwc3_usb_phy {
++ void __iomem *base;
++ struct device *dev;
++ struct phy *phy;
++
++ int (*phy_init)(struct qcom_dwc3_usb_phy *phy_dwc3);
++ int (*phy_exit)(struct qcom_dwc3_usb_phy *phy_dwc3);
++
++ struct clk *xo_clk;
++ struct clk *ref_clk;
++};
++
++/**
++ * Write register and read back masked value to confirm it is written
++ *
++ * @base - QCOM DWC3 PHY base virtual address.
++ * @offset - register offset.
++ * @mask - register bitmask specifying what should be updated
++ * @val - value to write.
++ */
++static inline void qcom_dwc3_phy_write_readback(
++ struct qcom_dwc3_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 retry = 10;
++
++ while (true) {
++ if (!readl(addr))
++ break;
++
++ if (--retry == 0)
++ return -ETIMEDOUT;
++
++ usleep_range(10, 20);
++ }
++
++ return 0;
++}
++
++/**
++ * Write SSPHY register
++ *
++ * @base - QCOM DWC3 PHY base virtual address.
++ * @addr - SSPHY address to write.
++ * @val - value to write.
++ */
++static int qcom_dwc3_ss_write_phycreg(void __iomem *base, u32 addr, u32 val)
++{
++ int ret;
++
++ writel(addr, base + CR_PROTOCOL_DATA_IN_REG);
++ writel(0x1, base + CR_PROTOCOL_CAP_ADDR_REG);
++
++ ret = wait_for_latch(base + CR_PROTOCOL_CAP_ADDR_REG);
++ if (ret)
++ goto err_wait;
++
++ writel(val, base + CR_PROTOCOL_DATA_IN_REG);
++ writel(0x1, base + CR_PROTOCOL_CAP_DATA_REG);
++
++ ret = wait_for_latch(base + CR_PROTOCOL_CAP_DATA_REG);
++ if (ret)
++ goto err_wait;
++
++ writel(0x1, base + CR_PROTOCOL_WRITE_REG);
++
++ ret = wait_for_latch(base + CR_PROTOCOL_WRITE_REG);
++
++err_wait:
++ return ret;
++}
++
++/**
++ * Read SSPHY register.
++ *
++ * @base - QCOM DWC3 PHY base virtual address.
++ * @addr - SSPHY address to read.
++ */
++static int qcom_dwc3_ss_read_phycreg(void __iomem *base, u32 addr, u32 *val)
++{
++ int ret;
++ bool first_read = true;
++
++ writel(addr, base + CR_PROTOCOL_DATA_IN_REG);
++ writel(0x1, base + CR_PROTOCOL_CAP_ADDR_REG);
++
++ ret = wait_for_latch(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.
++ */
++retry:
++ writel(0x1, base + CR_PROTOCOL_READ_REG);
++
++ ret = wait_for_latch(base + CR_PROTOCOL_READ_REG);
++ if (ret)
++ goto err_wait;
++
++ if (first_read) {
++ readl(base + CR_PROTOCOL_DATA_OUT_REG);
++ first_read = false;
++ goto retry;
++ }
++
++ *val = readl(base + CR_PROTOCOL_DATA_OUT_REG);
++
++err_wait:
++ return ret;
++}
++
++static int qcom_dwc3_phy_power_on(struct phy *phy)
++{
++ int ret;
++ struct qcom_dwc3_usb_phy *phy_dwc3 = phy_get_drvdata(phy);
++
++ 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;
++}
++
++static int qcom_dwc3_phy_power_off(struct phy *phy)
++{
++ struct qcom_dwc3_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_dwc3_hs_phy_init(struct qcom_dwc3_usb_phy *phy_dwc3)
++{
++ u32 val;
++
++ /*
++ * 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_DPSEHV_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_dwc3_ss_phy_init(struct qcom_dwc3_usb_phy *phy_dwc3)
++{
++ int ret;
++ u32 data = 0;
++
++ /* reset phy */
++ data = readl_relaxed(phy_dwc3->base + SSUSB_PHY_CTRL_REG);
++ writel_relaxed(data | SSUSB_CTRL_SS_PHY_RESET,
++ phy_dwc3->base + SSUSB_PHY_CTRL_REG);
++ usleep_range(2000, 2200);
++ writel_relaxed(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_relaxed(data, phy_dwc3->base + SSUSB_PHY_CTRL_REG);
++ msleep(30);
++
++ data |= SSUSB_CTRL_SS_PHY_EN | SSUSB_CTRL_LANE0_PWR_PRESENT;
++ writel_relaxed(data, phy_dwc3->base + SSUSB_PHY_CTRL_REG);
++
++ /*
++ * 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 to 3
++ * LANE0.RX_OVRD_IN_HI.RX_EQ_OVRD set to 1
++ */
++ ret = qcom_dwc3_ss_read_phycreg(phy_dwc3->base,
++ 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 |= 0x3 << RX_OVRD_IN_HI_RX_EQ_SHIFT;
++ data |= RX_OVRD_IN_HI_RX_EQ_OVRD;
++ ret = qcom_dwc3_ss_write_phycreg(phy_dwc3->base,
++ 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 to 22
++ * LANE0.TX_OVRD_DRV_LO.AMPLITUDE set to 127
++ * LANE0.TX_OVRD_DRV_LO.EN set to 1.
++ */
++ ret = qcom_dwc3_ss_read_phycreg(phy_dwc3->base,
++ SSPHY_CTRL_TX_OVRD_DRV_LO(0), &data);
++ if (ret)
++ goto err_phy_trans;
++
++ data &= ~TX_OVRD_DRV_LO_PREEMPH_MASK;
++ data |= 0x16 << TX_OVRD_DRV_LO_PREEMPH_SHIFT;
++ data &= ~TX_OVRD_DRV_LO_AMPLITUDE_MASK;
++ data |= 0x7f;
++ data |= TX_OVRD_DRV_LO_EN;
++ ret = qcom_dwc3_ss_write_phycreg(phy_dwc3->base,
++ SSPHY_CTRL_TX_OVRD_DRV_LO(0), data);
++ if (ret)
++ goto err_phy_trans;
++
++ /*
++ * Set the QSCRATCH PHY_PARAM_CTRL1 parameters as follows
++ * TX_FULL_SWING [26:20] amplitude to 127
++ * TX_DEEMPH_3_5DB [13:8] to 22
++ * LOS_BIAS [2:0] to 0x5
++ */
++ qcom_dwc3_phy_write_readback(phy_dwc3, SSUSB_PHY_PARAM_CTRL_1,
++ 0x07f03f07, 0x07f01605);
++
++err_phy_trans:
++ return ret;
++}
++
++static int qcom_dwc3_ss_phy_exit(struct qcom_dwc3_usb_phy *phy_dwc3)
++{
++ /* 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
++ * 4. Disable SSPHY ref clk
++ */
++ qcom_dwc3_phy_write_readback(phy_dwc3, SSUSB_PHY_CTRL_REG,
++ SSUSB_CTRL_SS_PHY_EN, 0x0);
++ qcom_dwc3_phy_write_readback(phy_dwc3, SSUSB_PHY_CTRL_REG,
++ SSUSB_CTRL_REF_USE_PAD, 0x0);
++ qcom_dwc3_phy_write_readback(phy_dwc3, SSUSB_PHY_CTRL_REG,
++ 0x0, SSUSB_CTRL_TEST_POWERDOWN);
++
++ return 0;
++}
++
++static int qcom_dwc3_phy_init(struct phy *phy)
++{
++ struct qcom_dwc3_usb_phy *phy_dwc3 = phy_get_drvdata(phy);
++
++ if (phy_dwc3->phy_init)
++ return phy_dwc3->phy_init(phy_dwc3);
++
++ return 0;
++}
++
++static int qcom_dwc3_phy_exit(struct phy *phy)
++{
++ struct qcom_dwc3_usb_phy *phy_dwc3 = phy_get_drvdata(phy);
++
++ if (phy_dwc3->phy_exit)
++ return qcom_dwc3_ss_phy_exit(phy_dwc3);
++
++ return 0;
++}
++
++static struct phy_ops qcom_dwc3_phy_ops = {
++ .init = qcom_dwc3_phy_init,
++ .exit = qcom_dwc3_phy_exit,
++ .power_on = qcom_dwc3_phy_power_on,
++ .power_off = qcom_dwc3_phy_power_off,
++ .owner = THIS_MODULE,
++};
++
++static const struct of_device_id qcom_dwc3_phy_table[] = {
++ { .compatible = "qcom,dwc3-hs-usb-phy", },
++ { .compatible = "qcom,dwc3-ss-usb-phy", },
++ { /* 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 resource *res;
++
++ phy_dwc3 = devm_kzalloc(&pdev->dev, sizeof(*phy_dwc3), GFP_KERNEL);
++ if (!phy_dwc3)
++ return -ENOMEM;
++
++ platform_set_drvdata(pdev, phy_dwc3);
++
++ 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);
++ }
++
++ if (of_device_is_compatible(pdev->dev.of_node,
++ "qcom,dwc3-hs-usb-phy")) {
++ clk_set_rate(phy_dwc3->ref_clk, 60000000);
++ phy_dwc3->phy_init = qcom_dwc3_hs_phy_init;
++ } else if (of_device_is_compatible(pdev->dev.of_node,
++ "qcom,dwc3-ss-usb-phy")) {
++ phy_dwc3->phy_init = qcom_dwc3_ss_phy_init;
++ phy_dwc3->phy_exit = qcom_dwc3_ss_phy_exit;
++ clk_set_rate(phy_dwc3->ref_clk, 125000000);
++ } else {
++ dev_err(phy_dwc3->dev, "Unknown phy\n");
++ return -EINVAL;
++ }
++
++ 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;
++ }
++
++ phy_dwc3->phy = devm_phy_create(phy_dwc3->dev, NULL, &qcom_dwc3_phy_ops,
++ NULL);
++
++ if (IS_ERR(phy_dwc3->phy))
++ return PTR_ERR(phy_dwc3->phy);
++
++ phy_set_drvdata(phy_dwc3->phy, 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");