1 // SPDX-License-Identifier: GPL-2.0+
3 * SAMSUNG EXYNOS5 USB HOST XHCI Controller
5 * Copyright (C) 2012 Samsung Electronics Co.Ltd
11 * This file is a conglomeration for DWC3-init sequence and further
12 * exynos5 specific PHY-init sequence.
19 #include <linux/delay.h>
20 #include <linux/libfdt.h>
24 #include <asm/arch/cpu.h>
25 #include <asm/arch/power.h>
26 #include <asm/arch/xhci-exynos.h>
28 #include <linux/errno.h>
29 #include <linux/compat.h>
30 #include <linux/usb/dwc3.h>
34 /* Declare global data pointer */
35 DECLARE_GLOBAL_DATA_PTR;
37 struct exynos_xhci_platdata {
40 struct gpio_desc vbus_gpio;
44 * Contains pointers to register base addresses
45 * for the usb controller.
48 struct usb_platdata usb_plat;
49 struct xhci_ctrl ctrl;
50 struct exynos_usb3_phy *usb3_phy;
51 struct xhci_hccr *hcd;
52 struct dwc3 *dwc3_reg;
55 static int xhci_usb_ofdata_to_platdata(struct udevice *dev)
57 struct exynos_xhci_platdata *plat = dev_get_platdata(dev);
58 const void *blob = gd->fdt_blob;
63 * Get the base address for XHCI controller from the device node
65 plat->hcd_base = dev_read_addr(dev);
66 if (plat->hcd_base == FDT_ADDR_T_NONE) {
67 debug("Can't get the XHCI register base address\n");
72 node = fdtdec_next_compatible_subnode(blob, dev_of_offset(dev),
73 COMPAT_SAMSUNG_EXYNOS5_USB3_PHY, &depth);
75 debug("XHCI: Can't get device node for usb3-phy controller\n");
80 * Get the base address for usbphy from the device node
82 plat->phy_base = fdtdec_get_addr(blob, node, "reg");
83 if (plat->phy_base == FDT_ADDR_T_NONE) {
84 debug("Can't get the usbphy register address\n");
89 gpio_request_by_name(dev, "samsung,vbus-gpio", 0,
90 &plat->vbus_gpio, GPIOD_IS_OUT);
95 static void exynos5_usb3_phy_init(struct exynos_usb3_phy *phy)
99 /* enabling usb_drd phy */
100 set_usbdrd_phy_ctrl(POWER_USB_DRD_PHY_CTRL_EN);
102 /* Reset USB 3.0 PHY */
103 writel(0x0, &phy->phy_reg0);
105 clrbits_le32(&phy->phy_param0,
106 /* Select PHY CLK source */
107 PHYPARAM0_REF_USE_PAD |
108 /* Set Loss-of-Signal Detector sensitivity */
109 PHYPARAM0_REF_LOSLEVEL_MASK);
110 setbits_le32(&phy->phy_param0, PHYPARAM0_REF_LOSLEVEL);
112 writel(0x0, &phy->phy_resume);
115 * Setting the Frame length Adj value[6:1] to default 0x20
116 * See xHCI 1.0 spec, 5.2.4
118 setbits_le32(&phy->link_system,
119 LINKSYSTEM_XHCI_VERSION_CONTROL |
120 LINKSYSTEM_FLADJ(0x20));
122 /* Set Tx De-Emphasis level */
123 clrbits_le32(&phy->phy_param1, PHYPARAM1_PCS_TXDEEMPH_MASK);
124 setbits_le32(&phy->phy_param1, PHYPARAM1_PCS_TXDEEMPH);
126 setbits_le32(&phy->phy_batchg, PHYBATCHG_UTMI_CLKSEL);
128 /* PHYTEST POWERDOWN Control */
129 clrbits_le32(&phy->phy_test,
130 PHYTEST_POWERDOWN_SSP |
131 PHYTEST_POWERDOWN_HSP);
133 /* UTMI Power Control */
134 writel(PHYUTMI_OTGDISABLE, &phy->phy_utmi);
136 /* Use core clock from main PLL */
137 reg = PHYCLKRST_REFCLKSEL_EXT_REFCLK |
138 /* Default 24Mhz crystal clock */
139 PHYCLKRST_FSEL(FSEL_CLKSEL_24M) |
140 PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF |
141 PHYCLKRST_SSC_REFCLKSEL(0x88) |
142 /* Force PortReset of PHY */
143 PHYCLKRST_PORTRESET |
144 /* Digital power supply in normal operating mode */
145 PHYCLKRST_RETENABLEN |
146 /* Enable ref clock for SS function */
147 PHYCLKRST_REF_SSP_EN |
148 /* Enable spread spectrum */
150 /* Power down HS Bias and PLL blocks in suspend mode */
153 writel(reg, &phy->phy_clk_rst);
155 /* giving time to Phy clock to settle before resetting */
158 reg &= ~PHYCLKRST_PORTRESET;
159 writel(reg, &phy->phy_clk_rst);
162 static void exynos5_usb3_phy_exit(struct exynos_usb3_phy *phy)
164 setbits_le32(&phy->phy_utmi,
166 PHYUTMI_FORCESUSPEND |
169 clrbits_le32(&phy->phy_clk_rst,
170 PHYCLKRST_REF_SSP_EN |
172 PHYCLKRST_COMMONONN);
174 /* PHYTEST POWERDOWN Control to remove leakage current */
175 setbits_le32(&phy->phy_test,
176 PHYTEST_POWERDOWN_SSP |
177 PHYTEST_POWERDOWN_HSP);
179 /* disabling usb_drd phy */
180 set_usbdrd_phy_ctrl(POWER_USB_DRD_PHY_CTRL_DISABLE);
183 static int exynos_xhci_core_init(struct exynos_xhci *exynos)
187 exynos5_usb3_phy_init(exynos->usb3_phy);
189 ret = dwc3_core_init(exynos->dwc3_reg);
191 debug("failed to initialize core\n");
195 /* We are hard-coding DWC3 core to Host Mode */
196 dwc3_set_mode(exynos->dwc3_reg, DWC3_GCTL_PRTCAP_HOST);
201 static void exynos_xhci_core_exit(struct exynos_xhci *exynos)
203 exynos5_usb3_phy_exit(exynos->usb3_phy);
206 static int xhci_usb_probe(struct udevice *dev)
208 struct exynos_xhci_platdata *plat = dev_get_platdata(dev);
209 struct exynos_xhci *ctx = dev_get_priv(dev);
210 struct xhci_hcor *hcor;
213 ctx->hcd = (struct xhci_hccr *)plat->hcd_base;
214 ctx->usb3_phy = (struct exynos_usb3_phy *)plat->phy_base;
215 ctx->dwc3_reg = (struct dwc3 *)((char *)(ctx->hcd) + DWC3_REG_OFFSET);
216 hcor = (struct xhci_hcor *)((uint32_t)ctx->hcd +
217 HC_LENGTH(xhci_readl(&ctx->hcd->cr_capbase)));
219 /* setup the Vbus gpio here */
220 if (dm_gpio_is_valid(&plat->vbus_gpio))
221 dm_gpio_set_value(&plat->vbus_gpio, 1);
223 ret = exynos_xhci_core_init(ctx);
225 puts("XHCI: failed to initialize controller\n");
229 return xhci_register(dev, ctx->hcd, hcor);
232 static int xhci_usb_remove(struct udevice *dev)
234 struct exynos_xhci *ctx = dev_get_priv(dev);
237 ret = xhci_deregister(dev);
240 exynos_xhci_core_exit(ctx);
245 static const struct udevice_id xhci_usb_ids[] = {
246 { .compatible = "samsung,exynos5250-xhci" },
250 U_BOOT_DRIVER(usb_xhci) = {
251 .name = "xhci_exynos",
253 .of_match = xhci_usb_ids,
254 .ofdata_to_platdata = xhci_usb_ofdata_to_platdata,
255 .probe = xhci_usb_probe,
256 .remove = xhci_usb_remove,
257 .ops = &xhci_usb_ops,
258 .platdata_auto = sizeof(struct exynos_xhci_platdata),
259 .priv_auto = sizeof(struct exynos_xhci),
260 .flags = DM_FLAG_ALLOC_PRIV_DMA,