--- /dev/null
+/*
+ * SAMSUNG EXYNOS5 USB HOST XHCI Controller
+ *
+ * Copyright (C) 2012 Samsung Electronics Co.Ltd
+ * Vivek Gautam <gautam.vivek@samsung.com>
+ * Vikas Sajjan <vikas.sajjan@samsung.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+/*
+ * This file is a conglomeration for DWC3-init sequence and further
+ * exynos5 specific PHY-init sequence.
+ */
+
+#include <common.h>
+#include <fdtdec.h>
+#include <libfdt.h>
+#include <malloc.h>
+#include <usb.h>
+#include <watchdog.h>
+#include <asm/arch/cpu.h>
+#include <asm/arch/power.h>
+#include <asm/arch/xhci-exynos.h>
+#include <asm/gpio.h>
+#include <asm-generic/errno.h>
+#include <linux/compat.h>
+#include <linux/usb/dwc3.h>
+
+#include "xhci.h"
+
+/* Declare global data pointer */
+DECLARE_GLOBAL_DATA_PTR;
+
+/**
+ * Contains pointers to register base addresses
+ * for the usb controller.
+ */
+struct exynos_xhci {
+ struct exynos_usb3_phy *usb3_phy;
+ struct xhci_hccr *hcd;
+ struct dwc3 *dwc3_reg;
+ struct fdt_gpio_state vbus_gpio;
+};
+
+static struct exynos_xhci exynos;
+
+#ifdef CONFIG_OF_CONTROL
+static int exynos_usb3_parse_dt(const void *blob, struct exynos_xhci *exynos)
+{
+ fdt_addr_t addr;
+ unsigned int node;
+ int depth;
+
+ node = fdtdec_next_compatible(blob, 0, COMPAT_SAMSUNG_EXYNOS5_XHCI);
+ if (node <= 0) {
+ debug("XHCI: Can't get device node for xhci\n");
+ return -ENODEV;
+ }
+
+ /*
+ * Get the base address for XHCI controller from the device node
+ */
+ addr = fdtdec_get_addr(blob, node, "reg");
+ if (addr == FDT_ADDR_T_NONE) {
+ debug("Can't get the XHCI register base address\n");
+ return -ENXIO;
+ }
+ exynos->hcd = (struct xhci_hccr *)addr;
+
+ /* Vbus gpio */
+ fdtdec_decode_gpio(blob, node, "samsung,vbus-gpio", &exynos->vbus_gpio);
+
+ depth = 0;
+ node = fdtdec_next_compatible_subnode(blob, node,
+ COMPAT_SAMSUNG_EXYNOS5_USB3_PHY, &depth);
+ if (node <= 0) {
+ debug("XHCI: Can't get device node for usb3-phy controller\n");
+ return -ENODEV;
+ }
+
+ /*
+ * Get the base address for usbphy from the device node
+ */
+ exynos->usb3_phy = (struct exynos_usb3_phy *)fdtdec_get_addr(blob, node,
+ "reg");
+ if (exynos->usb3_phy == NULL) {
+ debug("Can't get the usbphy register address\n");
+ return -ENXIO;
+ }
+
+ return 0;
+}
+#endif
+
+static void exynos5_usb3_phy_init(struct exynos_usb3_phy *phy)
+{
+ u32 reg;
+
+ /* enabling usb_drd phy */
+ set_usbdrd_phy_ctrl(POWER_USB_DRD_PHY_CTRL_EN);
+
+ /* Reset USB 3.0 PHY */
+ writel(0x0, &phy->phy_reg0);
+
+ clrbits_le32(&phy->phy_param0,
+ /* Select PHY CLK source */
+ PHYPARAM0_REF_USE_PAD |
+ /* Set Loss-of-Signal Detector sensitivity */
+ PHYPARAM0_REF_LOSLEVEL_MASK);
+ setbits_le32(&phy->phy_param0, PHYPARAM0_REF_LOSLEVEL);
+
+ writel(0x0, &phy->phy_resume);
+
+ /*
+ * Setting the Frame length Adj value[6:1] to default 0x20
+ * See xHCI 1.0 spec, 5.2.4
+ */
+ setbits_le32(&phy->link_system,
+ LINKSYSTEM_XHCI_VERSION_CONTROL |
+ LINKSYSTEM_FLADJ(0x20));
+
+ /* Set Tx De-Emphasis level */
+ clrbits_le32(&phy->phy_param1, PHYPARAM1_PCS_TXDEEMPH_MASK);
+ setbits_le32(&phy->phy_param1, PHYPARAM1_PCS_TXDEEMPH);
+
+ setbits_le32(&phy->phy_batchg, PHYBATCHG_UTMI_CLKSEL);
+
+ /* PHYTEST POWERDOWN Control */
+ clrbits_le32(&phy->phy_test,
+ PHYTEST_POWERDOWN_SSP |
+ PHYTEST_POWERDOWN_HSP);
+
+ /* UTMI Power Control */
+ writel(PHYUTMI_OTGDISABLE, &phy->phy_utmi);
+
+ /* Use core clock from main PLL */
+ reg = PHYCLKRST_REFCLKSEL_EXT_REFCLK |
+ /* Default 24Mhz crystal clock */
+ PHYCLKRST_FSEL(FSEL_CLKSEL_24M) |
+ PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF |
+ PHYCLKRST_SSC_REFCLKSEL(0x88) |
+ /* Force PortReset of PHY */
+ 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(reg, &phy->phy_clk_rst);
+
+ /* giving time to Phy clock to settle before resetting */
+ udelay(10);
+
+ reg &= ~PHYCLKRST_PORTRESET;
+ writel(reg, &phy->phy_clk_rst);
+}
+
+static void exynos5_usb3_phy_exit(struct exynos_usb3_phy *phy)
+{
+ setbits_le32(&phy->phy_utmi,
+ PHYUTMI_OTGDISABLE |
+ PHYUTMI_FORCESUSPEND |
+ PHYUTMI_FORCESLEEP);
+
+ clrbits_le32(&phy->phy_clk_rst,
+ PHYCLKRST_REF_SSP_EN |
+ PHYCLKRST_SSC_EN |
+ PHYCLKRST_COMMONONN);
+
+ /* PHYTEST POWERDOWN Control to remove leakage current */
+ setbits_le32(&phy->phy_test,
+ PHYTEST_POWERDOWN_SSP |
+ PHYTEST_POWERDOWN_HSP);
+
+ /* disabling usb_drd phy */
+ set_usbdrd_phy_ctrl(POWER_USB_DRD_PHY_CTRL_DISABLE);
+}
+
+void dwc3_set_mode(struct dwc3 *dwc3_reg, u32 mode)
+{
+ clrsetbits_le32(&dwc3_reg->g_ctl,
+ DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG),
+ DWC3_GCTL_PRTCAPDIR(mode));
+}
+
+static void dwc3_core_soft_reset(struct dwc3 *dwc3_reg)
+{
+ /* Before Resetting PHY, put Core in Reset */
+ setbits_le32(&dwc3_reg->g_ctl,
+ DWC3_GCTL_CORESOFTRESET);
+
+ /* Assert USB3 PHY reset */
+ setbits_le32(&dwc3_reg->g_usb3pipectl[0],
+ DWC3_GUSB3PIPECTL_PHYSOFTRST);
+
+ /* Assert USB2 PHY reset */
+ setbits_le32(&dwc3_reg->g_usb2phycfg,
+ DWC3_GUSB2PHYCFG_PHYSOFTRST);
+
+ mdelay(100);
+
+ /* Clear USB3 PHY reset */
+ clrbits_le32(&dwc3_reg->g_usb3pipectl[0],
+ DWC3_GUSB3PIPECTL_PHYSOFTRST);
+
+ /* Clear USB2 PHY reset */
+ clrbits_le32(&dwc3_reg->g_usb2phycfg,
+ DWC3_GUSB2PHYCFG_PHYSOFTRST);
+
+ /* After PHYs are stable we can take Core out of reset state */
+ clrbits_le32(&dwc3_reg->g_ctl,
+ DWC3_GCTL_CORESOFTRESET);
+}
+
+static int dwc3_core_init(struct dwc3 *dwc3_reg)
+{
+ u32 reg;
+ u32 revision;
+ unsigned int dwc3_hwparams1;
+
+ revision = readl(&dwc3_reg->g_snpsid);
+ /* This should read as U3 followed by revision number */
+ if ((revision & DWC3_GSNPSID_MASK) != 0x55330000) {
+ puts("this is not a DesignWare USB3 DRD Core\n");
+ return -EINVAL;
+ }
+
+ dwc3_core_soft_reset(dwc3_reg);
+
+ dwc3_hwparams1 = readl(&dwc3_reg->g_hwparams1);
+
+ reg = readl(&dwc3_reg->g_ctl);
+ reg &= ~DWC3_GCTL_SCALEDOWN_MASK;
+ reg &= ~DWC3_GCTL_DISSCRAMBLE;
+ switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc3_hwparams1)) {
+ case DWC3_GHWPARAMS1_EN_PWROPT_CLK:
+ reg &= ~DWC3_GCTL_DSBLCLKGTNG;
+ break;
+ default:
+ debug("No power optimization available\n");
+ }
+
+ /*
+ * WORKAROUND: DWC3 revisions <1.90a have a bug
+ * where the device can fail to connect at SuperSpeed
+ * and falls back to high-speed mode which causes
+ * the device to enter a Connect/Disconnect loop
+ */
+ if ((revision & DWC3_REVISION_MASK) < 0x190a)
+ reg |= DWC3_GCTL_U2RSTECN;
+
+ writel(reg, &dwc3_reg->g_ctl);
+
+ return 0;
+}
+
+static int exynos_xhci_core_init(struct exynos_xhci *exynos)
+{
+ int ret;
+
+ exynos5_usb3_phy_init(exynos->usb3_phy);
+
+ ret = dwc3_core_init(exynos->dwc3_reg);
+ if (ret) {
+ debug("failed to initialize core\n");
+ return -EINVAL;
+ }
+
+ /* We are hard-coding DWC3 core to Host Mode */
+ dwc3_set_mode(exynos->dwc3_reg, DWC3_GCTL_PRTCAP_HOST);
+
+ return 0;
+}
+
+static void exynos_xhci_core_exit(struct exynos_xhci *exynos)
+{
+ exynos5_usb3_phy_exit(exynos->usb3_phy);
+}
+
+int xhci_hcd_init(int index, struct xhci_hccr **hccr, struct xhci_hcor **hcor)
+{
+ struct exynos_xhci *ctx = &exynos;
+ int ret;
+
+#ifdef CONFIG_OF_CONTROL
+ exynos_usb3_parse_dt(gd->fdt_blob, ctx);
+#else
+ ctx->usb3_phy = (struct exynos_usb3_phy *)samsung_get_base_usb3_phy();
+ ctx->hcd = (struct xhci_hccr *)samsung_get_base_usb_xhci();
+#endif
+
+ ctx->dwc3_reg = (struct dwc3 *)((char *)(ctx->hcd) + DWC3_REG_OFFSET);
+
+#ifdef CONFIG_OF_CONTROL
+ /* setup the Vbus gpio here */
+ if (fdt_gpio_isvalid(&ctx->vbus_gpio) &&
+ !fdtdec_setup_gpio(&ctx->vbus_gpio))
+ gpio_direction_output(ctx->vbus_gpio.gpio, 1);
+#endif
+
+ ret = exynos_xhci_core_init(ctx);
+ if (ret) {
+ puts("XHCI: failed to initialize controller\n");
+ return -EINVAL;
+ }
+
+ *hccr = (ctx->hcd);
+ *hcor = (struct xhci_hcor *)((uint32_t) *hccr
+ + HC_LENGTH(xhci_readl(&(*hccr)->cr_capbase)));
+
+ debug("Exynos5-xhci: init hccr %x and hcor %x hc_length %d\n",
+ (uint32_t)*hccr, (uint32_t)*hcor,
+ (uint32_t)HC_LENGTH(xhci_readl(&(*hccr)->cr_capbase)));
+
+ return 0;
+}
+
+void xhci_hcd_stop(int index)
+{
+ struct exynos_xhci *ctx = &exynos;
+
+ exynos_xhci_core_exit(ctx);
+}
Code Review / kvmfornfv.git / blobdiff