blob: a27a79632b896aa1257dbfcc61d0b29bba687785 [file] [log] [blame]
/*
* 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 <dm.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;
struct exynos_xhci_platdata {
fdt_addr_t hcd_base;
fdt_addr_t phy_base;
struct gpio_desc vbus_gpio;
};
/**
* Contains pointers to register base addresses
* for the usb controller.
*/
struct exynos_xhci {
struct usb_platdata usb_plat;
struct xhci_ctrl ctrl;
struct exynos_usb3_phy *usb3_phy;
struct xhci_hccr *hcd;
struct dwc3 *dwc3_reg;
};
static int xhci_usb_ofdata_to_platdata(struct udevice *dev)
{
struct exynos_xhci_platdata *plat = dev_get_platdata(dev);
const void *blob = gd->fdt_blob;
unsigned int node;
int depth;
/*
* Get the base address for XHCI controller from the device node
*/
plat->hcd_base = fdtdec_get_addr(blob, dev->of_offset, "reg");
if (plat->hcd_base == FDT_ADDR_T_NONE) {
debug("Can't get the XHCI register base address\n");
return -ENXIO;
}
depth = 0;
node = fdtdec_next_compatible_subnode(blob, dev->of_offset,
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
*/
plat->phy_base = fdtdec_get_addr(blob, node, "reg");
if (plat->phy_base == FDT_ADDR_T_NONE) {
debug("Can't get the usbphy register address\n");
return -ENXIO;
}
/* Vbus gpio */
gpio_request_by_name(dev, "samsung,vbus-gpio", 0,
&plat->vbus_gpio, GPIOD_IS_OUT);
return 0;
}
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);
}
static 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);
}
static int xhci_usb_probe(struct udevice *dev)
{
struct exynos_xhci_platdata *plat = dev_get_platdata(dev);
struct exynos_xhci *ctx = dev_get_priv(dev);
struct xhci_hcor *hcor;
int ret;
ctx->hcd = (struct xhci_hccr *)plat->hcd_base;
ctx->usb3_phy = (struct exynos_usb3_phy *)plat->phy_base;
ctx->dwc3_reg = (struct dwc3 *)((char *)(ctx->hcd) + DWC3_REG_OFFSET);
hcor = (struct xhci_hcor *)((uint32_t)ctx->hcd +
HC_LENGTH(xhci_readl(&ctx->hcd->cr_capbase)));
/* setup the Vbus gpio here */
if (dm_gpio_is_valid(&plat->vbus_gpio))
dm_gpio_set_value(&plat->vbus_gpio, 1);
ret = exynos_xhci_core_init(ctx);
if (ret) {
puts("XHCI: failed to initialize controller\n");
return -EINVAL;
}
return xhci_register(dev, ctx->hcd, hcor);
}
static int xhci_usb_remove(struct udevice *dev)
{
struct exynos_xhci *ctx = dev_get_priv(dev);
int ret;
ret = xhci_deregister(dev);
if (ret)
return ret;
exynos_xhci_core_exit(ctx);
return 0;
}
static const struct udevice_id xhci_usb_ids[] = {
{ .compatible = "samsung,exynos5250-xhci" },
{ }
};
U_BOOT_DRIVER(usb_xhci) = {
.name = "xhci_exynos",
.id = UCLASS_USB,
.of_match = xhci_usb_ids,
.ofdata_to_platdata = xhci_usb_ofdata_to_platdata,
.probe = xhci_usb_probe,
.remove = xhci_usb_remove,
.ops = &xhci_usb_ops,
.platdata_auto_alloc_size = sizeof(struct exynos_xhci_platdata),
.priv_auto_alloc_size = sizeof(struct exynos_xhci),
.flags = DM_FLAG_ALLOC_PRIV_DMA,
};