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 <linux/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 = devfdt_get_addr(dev);
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(dev),
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 int exynos_xhci_core_init(struct exynos_xhci *exynos)
186 exynos5_usb3_phy_init(exynos->usb3_phy);
188 ret = dwc3_core_init(exynos->dwc3_reg);
190 debug("failed to initialize core\n");
194 /* We are hard-coding DWC3 core to Host Mode */
195 dwc3_set_mode(exynos->dwc3_reg, DWC3_GCTL_PRTCAP_HOST);
200 static void exynos_xhci_core_exit(struct exynos_xhci *exynos)
202 exynos5_usb3_phy_exit(exynos->usb3_phy);
205 static int xhci_usb_probe(struct udevice *dev)
207 struct exynos_xhci_platdata *plat = dev_get_platdata(dev);
208 struct exynos_xhci *ctx = dev_get_priv(dev);
209 struct xhci_hcor *hcor;
212 ctx->hcd = (struct xhci_hccr *)plat->hcd_base;
213 ctx->usb3_phy = (struct exynos_usb3_phy *)plat->phy_base;
214 ctx->dwc3_reg = (struct dwc3 *)((char *)(ctx->hcd) + DWC3_REG_OFFSET);
215 hcor = (struct xhci_hcor *)((uint32_t)ctx->hcd +
216 HC_LENGTH(xhci_readl(&ctx->hcd->cr_capbase)));
218 /* setup the Vbus gpio here */
219 if (dm_gpio_is_valid(&plat->vbus_gpio))
220 dm_gpio_set_value(&plat->vbus_gpio, 1);
222 ret = exynos_xhci_core_init(ctx);
224 puts("XHCI: failed to initialize controller\n");
228 return xhci_register(dev, ctx->hcd, hcor);
231 static int xhci_usb_remove(struct udevice *dev)
233 struct exynos_xhci *ctx = dev_get_priv(dev);
236 ret = xhci_deregister(dev);
239 exynos_xhci_core_exit(ctx);
244 static const struct udevice_id xhci_usb_ids[] = {
245 { .compatible = "samsung,exynos5250-xhci" },
249 U_BOOT_DRIVER(usb_xhci) = {
250 .name = "xhci_exynos",
252 .of_match = xhci_usb_ids,
253 .ofdata_to_platdata = xhci_usb_ofdata_to_platdata,
254 .probe = xhci_usb_probe,
255 .remove = xhci_usb_remove,
256 .ops = &xhci_usb_ops,
257 .platdata_auto_alloc_size = sizeof(struct exynos_xhci_platdata),
258 .priv_auto_alloc_size = sizeof(struct exynos_xhci),
259 .flags = DM_FLAG_ALLOC_PRIV_DMA,