+++ /dev/null
-/* linux/drivers/usb/phy/phy-samsung-usb3.c
- *
- * Copyright (c) 2013 Samsung Electronics Co., Ltd.
- * http://www.samsung.com
- *
- * Author: Vivek Gautam <gautam.vivek@samsung.com>
- *
- * Samsung USB 3.0 PHY transceiver; talks to DWC3 controller.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License 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/module.h>
-#include <linux/platform_device.h>
-#include <linux/clk.h>
-#include <linux/delay.h>
-#include <linux/err.h>
-#include <linux/io.h>
-#include <linux/of.h>
-#include <linux/usb/samsung_usb_phy.h>
-#include <linux/platform_data/samsung-usbphy.h>
-
-#include "phy-samsung-usb.h"
-
-/*
- * Sets the phy clk as EXTREFCLK (XXTI) which is internal clock from clock core.
- */
-static u32 samsung_usb3phy_set_refclk(struct samsung_usbphy *sphy)
-{
- u32 reg;
- u32 refclk;
-
- refclk = sphy->ref_clk_freq;
-
- reg = PHYCLKRST_REFCLKSEL_EXT_REFCLK |
- PHYCLKRST_FSEL(refclk);
-
- switch (refclk) {
- case FSEL_CLKSEL_50M:
- reg |= (PHYCLKRST_MPLL_MULTIPLIER_50M_REF |
- PHYCLKRST_SSC_REFCLKSEL(0x00));
- break;
- case FSEL_CLKSEL_20M:
- reg |= (PHYCLKRST_MPLL_MULTIPLIER_20MHZ_REF |
- PHYCLKRST_SSC_REFCLKSEL(0x00));
- break;
- case FSEL_CLKSEL_19200K:
- reg |= (PHYCLKRST_MPLL_MULTIPLIER_19200KHZ_REF |
- PHYCLKRST_SSC_REFCLKSEL(0x88));
- break;
- case FSEL_CLKSEL_24M:
- default:
- reg |= (PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF |
- PHYCLKRST_SSC_REFCLKSEL(0x88));
- break;
- }
-
- return reg;
-}
-
-static void samsung_exynos5_usb3phy_enable(struct samsung_usbphy *sphy)
-{
- void __iomem *regs = sphy->regs;
- u32 phyparam0;
- u32 phyparam1;
- u32 linksystem;
- u32 phybatchg;
- u32 phytest;
- u32 phyclkrst;
-
- /* Reset USB 3.0 PHY */
- writel(0x0, regs + EXYNOS5_DRD_PHYREG0);
-
- phyparam0 = readl(regs + EXYNOS5_DRD_PHYPARAM0);
- /* Select PHY CLK source */
- phyparam0 &= ~PHYPARAM0_REF_USE_PAD;
- /* Set Loss-of-Signal Detector sensitivity */
- phyparam0 &= ~PHYPARAM0_REF_LOSLEVEL_MASK;
- phyparam0 |= PHYPARAM0_REF_LOSLEVEL;
- writel(phyparam0, regs + EXYNOS5_DRD_PHYPARAM0);
-
- writel(0x0, regs + EXYNOS5_DRD_PHYRESUME);
-
- /*
- * Setting the Frame length Adj value[6:1] to default 0x20
- * See xHCI 1.0 spec, 5.2.4
- */
- linksystem = LINKSYSTEM_XHCI_VERSION_CONTROL |
- LINKSYSTEM_FLADJ(0x20);
- writel(linksystem, regs + EXYNOS5_DRD_LINKSYSTEM);
-
- phyparam1 = readl(regs + EXYNOS5_DRD_PHYPARAM1);
- /* Set Tx De-Emphasis level */
- phyparam1 &= ~PHYPARAM1_PCS_TXDEEMPH_MASK;
- phyparam1 |= PHYPARAM1_PCS_TXDEEMPH;
- writel(phyparam1, regs + EXYNOS5_DRD_PHYPARAM1);
-
- phybatchg = readl(regs + EXYNOS5_DRD_PHYBATCHG);
- phybatchg |= PHYBATCHG_UTMI_CLKSEL;
- writel(phybatchg, regs + EXYNOS5_DRD_PHYBATCHG);
-
- /* PHYTEST POWERDOWN Control */
- phytest = readl(regs + EXYNOS5_DRD_PHYTEST);
- phytest &= ~(PHYTEST_POWERDOWN_SSP |
- PHYTEST_POWERDOWN_HSP);
- writel(phytest, regs + EXYNOS5_DRD_PHYTEST);
-
- /* UTMI Power Control */
- writel(PHYUTMI_OTGDISABLE, regs + EXYNOS5_DRD_PHYUTMI);
-
- phyclkrst = samsung_usb3phy_set_refclk(sphy);
-
- phyclkrst |= PHYCLKRST_PORTRESET |
- /* Digital power supply in normal operating mode */
- PHYCLKRST_RETENABLEN |
- /* Enable ref clock for SS function */
- PHYCLKRST_REF_SSP_EN |
- /* Enable spread spectrum */
- PHYCLKRST_SSC_EN |
- /* Power down HS Bias and PLL blocks in suspend mode */
- PHYCLKRST_COMMONONN;
-
- writel(phyclkrst, regs + EXYNOS5_DRD_PHYCLKRST);
-
- udelay(10);
-
- phyclkrst &= ~(PHYCLKRST_PORTRESET);
- writel(phyclkrst, regs + EXYNOS5_DRD_PHYCLKRST);
-}
-
-static void samsung_exynos5_usb3phy_disable(struct samsung_usbphy *sphy)
-{
- u32 phyutmi;
- u32 phyclkrst;
- u32 phytest;
- void __iomem *regs = sphy->regs;
-
- phyutmi = PHYUTMI_OTGDISABLE |
- PHYUTMI_FORCESUSPEND |
- PHYUTMI_FORCESLEEP;
- writel(phyutmi, regs + EXYNOS5_DRD_PHYUTMI);
-
- /* Resetting the PHYCLKRST enable bits to reduce leakage current */
- phyclkrst = readl(regs + EXYNOS5_DRD_PHYCLKRST);
- phyclkrst &= ~(PHYCLKRST_REF_SSP_EN |
- PHYCLKRST_SSC_EN |
- PHYCLKRST_COMMONONN);
- writel(phyclkrst, regs + EXYNOS5_DRD_PHYCLKRST);
-
- /* Control PHYTEST to remove leakage current */
- phytest = readl(regs + EXYNOS5_DRD_PHYTEST);
- phytest |= (PHYTEST_POWERDOWN_SSP |
- PHYTEST_POWERDOWN_HSP);
- writel(phytest, regs + EXYNOS5_DRD_PHYTEST);
-}
-
-static int samsung_usb3phy_init(struct usb_phy *phy)
-{
- struct samsung_usbphy *sphy;
- unsigned long flags;
- int ret = 0;
-
- sphy = phy_to_sphy(phy);
-
- /* Enable the phy clock */
- ret = clk_prepare_enable(sphy->clk);
- if (ret) {
- dev_err(sphy->dev, "%s: clk_prepare_enable failed\n", __func__);
- return ret;
- }
-
- spin_lock_irqsave(&sphy->lock, flags);
-
- /* setting default phy-type for USB 3.0 */
- samsung_usbphy_set_type(&sphy->phy, USB_PHY_TYPE_DEVICE);
-
- /* Disable phy isolation */
- if (sphy->drv_data->set_isolation)
- sphy->drv_data->set_isolation(sphy, false);
-
- /* Initialize usb phy registers */
- sphy->drv_data->phy_enable(sphy);
-
- spin_unlock_irqrestore(&sphy->lock, flags);
-
- /* Disable the phy clock */
- clk_disable_unprepare(sphy->clk);
-
- return ret;
-}
-
-/*
- * The function passed to the usb driver for phy shutdown
- */
-static void samsung_usb3phy_shutdown(struct usb_phy *phy)
-{
- struct samsung_usbphy *sphy;
- unsigned long flags;
-
- sphy = phy_to_sphy(phy);
-
- if (clk_prepare_enable(sphy->clk)) {
- dev_err(sphy->dev, "%s: clk_prepare_enable failed\n", __func__);
- return;
- }
-
- spin_lock_irqsave(&sphy->lock, flags);
-
- /* setting default phy-type for USB 3.0 */
- samsung_usbphy_set_type(&sphy->phy, USB_PHY_TYPE_DEVICE);
-
- /* De-initialize usb phy registers */
- sphy->drv_data->phy_disable(sphy);
-
- /* Enable phy isolation */
- if (sphy->drv_data->set_isolation)
- sphy->drv_data->set_isolation(sphy, true);
-
- spin_unlock_irqrestore(&sphy->lock, flags);
-
- clk_disable_unprepare(sphy->clk);
-}
-
-static int samsung_usb3phy_probe(struct platform_device *pdev)
-{
- struct samsung_usbphy *sphy;
- struct samsung_usbphy_data *pdata = dev_get_platdata(&pdev->dev);
- struct device *dev = &pdev->dev;
- struct resource *phy_mem;
- void __iomem *phy_base;
- struct clk *clk;
- int ret;
-
- phy_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- phy_base = devm_ioremap_resource(dev, phy_mem);
- if (IS_ERR(phy_base))
- return PTR_ERR(phy_base);
-
- sphy = devm_kzalloc(dev, sizeof(*sphy), GFP_KERNEL);
- if (!sphy)
- return -ENOMEM;
-
- clk = devm_clk_get(dev, "usbdrd30");
- if (IS_ERR(clk)) {
- dev_err(dev, "Failed to get device clock\n");
- return PTR_ERR(clk);
- }
-
- sphy->dev = dev;
-
- if (dev->of_node) {
- ret = samsung_usbphy_parse_dt(sphy);
- if (ret < 0)
- return ret;
- } else {
- if (!pdata) {
- dev_err(dev, "no platform data specified\n");
- return -EINVAL;
- }
- }
-
- sphy->plat = pdata;
- sphy->regs = phy_base;
- sphy->clk = clk;
- sphy->phy.dev = sphy->dev;
- sphy->phy.label = "samsung-usb3phy";
- sphy->phy.type = USB_PHY_TYPE_USB3;
- sphy->phy.init = samsung_usb3phy_init;
- sphy->phy.shutdown = samsung_usb3phy_shutdown;
- sphy->drv_data = samsung_usbphy_get_driver_data(pdev);
-
- sphy->ref_clk_freq = samsung_usbphy_get_refclk_freq(sphy);
- if (sphy->ref_clk_freq < 0)
- return -EINVAL;
-
- spin_lock_init(&sphy->lock);
-
- platform_set_drvdata(pdev, sphy);
-
- return usb_add_phy_dev(&sphy->phy);
-}
-
-static int samsung_usb3phy_remove(struct platform_device *pdev)
-{
- struct samsung_usbphy *sphy = platform_get_drvdata(pdev);
-
- usb_remove_phy(&sphy->phy);
-
- if (sphy->pmuregs)
- iounmap(sphy->pmuregs);
- if (sphy->sysreg)
- iounmap(sphy->sysreg);
-
- return 0;
-}
-
-static struct samsung_usbphy_drvdata usb3phy_exynos5 = {
- .cpu_type = TYPE_EXYNOS5250,
- .devphy_en_mask = EXYNOS_USBPHY_ENABLE,
- .rate_to_clksel = samsung_usbphy_rate_to_clksel_4x12,
- .set_isolation = samsung_usbphy_set_isolation_4210,
- .phy_enable = samsung_exynos5_usb3phy_enable,
- .phy_disable = samsung_exynos5_usb3phy_disable,
-};
-
-#ifdef CONFIG_OF
-static const struct of_device_id samsung_usbphy_dt_match[] = {
- {
- .compatible = "samsung,exynos5250-usb3phy",
- .data = &usb3phy_exynos5
- },
- {},
-};
-MODULE_DEVICE_TABLE(of, samsung_usbphy_dt_match);
-#endif
-
-static struct platform_device_id samsung_usbphy_driver_ids[] = {
- {
- .name = "exynos5250-usb3phy",
- .driver_data = (unsigned long)&usb3phy_exynos5,
- },
- {},
-};
-
-MODULE_DEVICE_TABLE(platform, samsung_usbphy_driver_ids);
-
-static struct platform_driver samsung_usb3phy_driver = {
- .probe = samsung_usb3phy_probe,
- .remove = samsung_usb3phy_remove,
- .id_table = samsung_usbphy_driver_ids,
- .driver = {
- .name = "samsung-usb3phy",
- .owner = THIS_MODULE,
- .of_match_table = of_match_ptr(samsung_usbphy_dt_match),
- },
-};
-
-module_platform_driver(samsung_usb3phy_driver);
-
-MODULE_DESCRIPTION("Samsung USB 3.0 phy controller");
-MODULE_AUTHOR("Vivek Gautam <gautam.vivek@samsung.com>");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:samsung-usb3phy");
projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / commitdiff