2 * SAMSUNG EXYNOS5 USB HOST XHCI Controller
4 * Copyright (C) 2012 Samsung Electronics Co.Ltd
5 * Vivek Gautam <gautam.vivek@samsung.com>
6 * Vikas Sajjan <vikas.sajjan@samsung.com>
8 * SPDX-License-Identifier: GPL-2.0+
12 * This file is a conglomeration for DWC3-init sequence and further
13 * exynos5 specific PHY-init sequence.
23 #include <asm/arch/cpu.h>
24 #include <asm/arch/power.h>
25 #include <asm/arch/xhci-exynos.h>
27 #include <asm-generic/errno.h>
28 #include <linux/compat.h>
29 #include <linux/usb/dwc3.h>
33 /* Declare global data pointer */
34 DECLARE_GLOBAL_DATA_PTR;
36 struct exynos_xhci_platdata {
39 struct gpio_desc vbus_gpio;
43 * Contains pointers to register base addresses
44 * for the usb controller.
47 struct usb_platdata usb_plat;
48 struct xhci_ctrl ctrl;
49 struct exynos_usb3_phy *usb3_phy;
50 struct xhci_hccr *hcd;
51 struct dwc3 *dwc3_reg;
54 static int xhci_usb_ofdata_to_platdata(struct udevice *dev)
56 struct exynos_xhci_platdata *plat = dev_get_platdata(dev);
57 const void *blob = gd->fdt_blob;
62 * Get the base address for XHCI controller from the device node
64 plat->hcd_base = fdtdec_get_addr(blob, dev->of_offset, "reg");
65 if (plat->hcd_base == FDT_ADDR_T_NONE) {
66 debug("Can't get the XHCI register base address\n");
71 node = fdtdec_next_compatible_subnode(blob, dev->of_offset,
72 COMPAT_SAMSUNG_EXYNOS5_USB3_PHY, &depth);
74 debug("XHCI: Can't get device node for usb3-phy controller\n");
79 * Get the base address for usbphy from the device node
81 plat->phy_base = fdtdec_get_addr(blob, node, "reg");
82 if (plat->phy_base == FDT_ADDR_T_NONE) {
83 debug("Can't get the usbphy register address\n");
88 gpio_request_by_name(dev, "samsung,vbus-gpio", 0,
89 &plat->vbus_gpio, GPIOD_IS_OUT);
94 static void exynos5_usb3_phy_init(struct exynos_usb3_phy *phy)
98 /* enabling usb_drd phy */
99 set_usbdrd_phy_ctrl(POWER_USB_DRD_PHY_CTRL_EN);
101 /* Reset USB 3.0 PHY */
102 writel(0x0, &phy->phy_reg0);
104 clrbits_le32(&phy->phy_param0,
105 /* Select PHY CLK source */
106 PHYPARAM0_REF_USE_PAD |
107 /* Set Loss-of-Signal Detector sensitivity */
108 PHYPARAM0_REF_LOSLEVEL_MASK);
109 setbits_le32(&phy->phy_param0, PHYPARAM0_REF_LOSLEVEL);
111 writel(0x0, &phy->phy_resume);
114 * Setting the Frame length Adj value[6:1] to default 0x20
115 * See xHCI 1.0 spec, 5.2.4
117 setbits_le32(&phy->link_system,
118 LINKSYSTEM_XHCI_VERSION_CONTROL |
119 LINKSYSTEM_FLADJ(0x20));
121 /* Set Tx De-Emphasis level */
122 clrbits_le32(&phy->phy_param1, PHYPARAM1_PCS_TXDEEMPH_MASK);
123 setbits_le32(&phy->phy_param1, PHYPARAM1_PCS_TXDEEMPH);
125 setbits_le32(&phy->phy_batchg, PHYBATCHG_UTMI_CLKSEL);
127 /* PHYTEST POWERDOWN Control */
128 clrbits_le32(&phy->phy_test,
129 PHYTEST_POWERDOWN_SSP |
130 PHYTEST_POWERDOWN_HSP);
132 /* UTMI Power Control */
133 writel(PHYUTMI_OTGDISABLE, &phy->phy_utmi);
135 /* Use core clock from main PLL */
136 reg = PHYCLKRST_REFCLKSEL_EXT_REFCLK |
137 /* Default 24Mhz crystal clock */
138 PHYCLKRST_FSEL(FSEL_CLKSEL_24M) |
139 PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF |
140 PHYCLKRST_SSC_REFCLKSEL(0x88) |
141 /* Force PortReset of PHY */
142 PHYCLKRST_PORTRESET |
143 /* Digital power supply in normal operating mode */
144 PHYCLKRST_RETENABLEN |
145 /* Enable ref clock for SS function */
146 PHYCLKRST_REF_SSP_EN |
147 /* Enable spread spectrum */
149 /* Power down HS Bias and PLL blocks in suspend mode */
152 writel(reg, &phy->phy_clk_rst);
154 /* giving time to Phy clock to settle before resetting */
157 reg &= ~PHYCLKRST_PORTRESET;
158 writel(reg, &phy->phy_clk_rst);
161 static void exynos5_usb3_phy_exit(struct exynos_usb3_phy *phy)
163 setbits_le32(&phy->phy_utmi,
165 PHYUTMI_FORCESUSPEND |
168 clrbits_le32(&phy->phy_clk_rst,
169 PHYCLKRST_REF_SSP_EN |
171 PHYCLKRST_COMMONONN);
173 /* PHYTEST POWERDOWN Control to remove leakage current */
174 setbits_le32(&phy->phy_test,
175 PHYTEST_POWERDOWN_SSP |
176 PHYTEST_POWERDOWN_HSP);
178 /* disabling usb_drd phy */
179 set_usbdrd_phy_ctrl(POWER_USB_DRD_PHY_CTRL_DISABLE);
182 static void dwc3_set_mode(struct dwc3 *dwc3_reg, u32 mode)
184 clrsetbits_le32(&dwc3_reg->g_ctl,
185 DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG),
186 DWC3_GCTL_PRTCAPDIR(mode));
189 static void dwc3_core_soft_reset(struct dwc3 *dwc3_reg)
191 /* Before Resetting PHY, put Core in Reset */
192 setbits_le32(&dwc3_reg->g_ctl,
193 DWC3_GCTL_CORESOFTRESET);
195 /* Assert USB3 PHY reset */
196 setbits_le32(&dwc3_reg->g_usb3pipectl[0],
197 DWC3_GUSB3PIPECTL_PHYSOFTRST);
199 /* Assert USB2 PHY reset */
200 setbits_le32(&dwc3_reg->g_usb2phycfg,
201 DWC3_GUSB2PHYCFG_PHYSOFTRST);
205 /* Clear USB3 PHY reset */
206 clrbits_le32(&dwc3_reg->g_usb3pipectl[0],
207 DWC3_GUSB3PIPECTL_PHYSOFTRST);
209 /* Clear USB2 PHY reset */
210 clrbits_le32(&dwc3_reg->g_usb2phycfg,
211 DWC3_GUSB2PHYCFG_PHYSOFTRST);
213 /* After PHYs are stable we can take Core out of reset state */
214 clrbits_le32(&dwc3_reg->g_ctl,
215 DWC3_GCTL_CORESOFTRESET);
218 static int dwc3_core_init(struct dwc3 *dwc3_reg)
222 unsigned int dwc3_hwparams1;
224 revision = readl(&dwc3_reg->g_snpsid);
225 /* This should read as U3 followed by revision number */
226 if ((revision & DWC3_GSNPSID_MASK) != 0x55330000) {
227 puts("this is not a DesignWare USB3 DRD Core\n");
231 dwc3_core_soft_reset(dwc3_reg);
233 dwc3_hwparams1 = readl(&dwc3_reg->g_hwparams1);
235 reg = readl(&dwc3_reg->g_ctl);
236 reg &= ~DWC3_GCTL_SCALEDOWN_MASK;
237 reg &= ~DWC3_GCTL_DISSCRAMBLE;
238 switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc3_hwparams1)) {
239 case DWC3_GHWPARAMS1_EN_PWROPT_CLK:
240 reg &= ~DWC3_GCTL_DSBLCLKGTNG;
243 debug("No power optimization available\n");
247 * WORKAROUND: DWC3 revisions <1.90a have a bug
248 * where the device can fail to connect at SuperSpeed
249 * and falls back to high-speed mode which causes
250 * the device to enter a Connect/Disconnect loop
252 if ((revision & DWC3_REVISION_MASK) < 0x190a)
253 reg |= DWC3_GCTL_U2RSTECN;
255 writel(reg, &dwc3_reg->g_ctl);
260 static int exynos_xhci_core_init(struct exynos_xhci *exynos)
264 exynos5_usb3_phy_init(exynos->usb3_phy);
266 ret = dwc3_core_init(exynos->dwc3_reg);
268 debug("failed to initialize core\n");
272 /* We are hard-coding DWC3 core to Host Mode */
273 dwc3_set_mode(exynos->dwc3_reg, DWC3_GCTL_PRTCAP_HOST);
278 static void exynos_xhci_core_exit(struct exynos_xhci *exynos)
280 exynos5_usb3_phy_exit(exynos->usb3_phy);
283 static int xhci_usb_probe(struct udevice *dev)
285 struct exynos_xhci_platdata *plat = dev_get_platdata(dev);
286 struct exynos_xhci *ctx = dev_get_priv(dev);
287 struct xhci_hcor *hcor;
290 ctx->hcd = (struct xhci_hccr *)plat->hcd_base;
291 ctx->usb3_phy = (struct exynos_usb3_phy *)plat->phy_base;
292 ctx->dwc3_reg = (struct dwc3 *)((char *)(ctx->hcd) + DWC3_REG_OFFSET);
293 hcor = (struct xhci_hcor *)((uint32_t)ctx->hcd +
294 HC_LENGTH(xhci_readl(&ctx->hcd->cr_capbase)));
296 /* setup the Vbus gpio here */
297 if (dm_gpio_is_valid(&plat->vbus_gpio))
298 dm_gpio_set_value(&plat->vbus_gpio, 1);
300 ret = exynos_xhci_core_init(ctx);
302 puts("XHCI: failed to initialize controller\n");
306 return xhci_register(dev, ctx->hcd, hcor);
309 static int xhci_usb_remove(struct udevice *dev)
311 struct exynos_xhci *ctx = dev_get_priv(dev);
314 ret = xhci_deregister(dev);
317 exynos_xhci_core_exit(ctx);
322 static const struct udevice_id xhci_usb_ids[] = {
323 { .compatible = "samsung,exynos5250-xhci" },
327 U_BOOT_DRIVER(usb_xhci) = {
328 .name = "xhci_exynos",
330 .of_match = xhci_usb_ids,
331 .ofdata_to_platdata = xhci_usb_ofdata_to_platdata,
332 .probe = xhci_usb_probe,
333 .remove = xhci_usb_remove,
334 .ops = &xhci_usb_ops,
335 .platdata_auto_alloc_size = sizeof(struct exynos_xhci_platdata),
336 .priv_auto_alloc_size = sizeof(struct exynos_xhci),
337 .flags = DM_FLAG_ALLOC_PRIV_DMA,