1 // SPDX-License-Identifier: GPL-2.0+
3 * STiH407 family DWC3 specific Glue layer
5 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
6 * Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
14 #include <linux/libfdt.h>
17 #include <reset-uclass.h>
21 #include <linux/usb/dwc3.h>
22 #include <linux/usb/otg.h>
23 #include <dwc3-sti-glue.h>
25 DECLARE_GLOBAL_DATA_PTR;
28 * struct sti_dwc3_glue_platdata - dwc3 STi glue driver private structure
29 * @syscfg_base: addr for the glue syscfg
30 * @glue_base: addr for the glue registers
31 * @syscfg_offset: usb syscfg control offset
32 * @powerdown_ctl: rest controller for powerdown signal
33 * @softreset_ctl: reset controller for softreset signal
34 * @mode: drd static host/device config
36 struct sti_dwc3_glue_platdata {
37 phys_addr_t syscfg_base;
38 phys_addr_t glue_base;
39 phys_addr_t syscfg_offset;
40 struct reset_ctl powerdown_ctl;
41 struct reset_ctl softreset_ctl;
42 enum usb_dr_mode mode;
45 static int sti_dwc3_glue_drd_init(struct sti_dwc3_glue_platdata *plat)
49 val = readl(plat->syscfg_base + plat->syscfg_offset);
51 val &= USB3_CONTROL_MASK;
54 case USB_DR_MODE_PERIPHERAL:
55 val &= ~(USB3_DELAY_VBUSVALID
56 | USB3_SEL_FORCE_OPMODE | USB3_FORCE_OPMODE(0x3)
57 | USB3_SEL_FORCE_DPPULLDOWN2 | USB3_FORCE_DPPULLDOWN2
58 | USB3_SEL_FORCE_DMPULLDOWN2 | USB3_FORCE_DMPULLDOWN2);
60 val |= USB3_DEVICE_NOT_HOST | USB3_FORCE_VBUSVALID;
63 case USB_DR_MODE_HOST:
64 val &= ~(USB3_DEVICE_NOT_HOST | USB3_FORCE_VBUSVALID
65 | USB3_SEL_FORCE_OPMODE | USB3_FORCE_OPMODE(0x3)
66 | USB3_SEL_FORCE_DPPULLDOWN2 | USB3_FORCE_DPPULLDOWN2
67 | USB3_SEL_FORCE_DMPULLDOWN2 | USB3_FORCE_DMPULLDOWN2);
69 val |= USB3_DELAY_VBUSVALID;
73 pr_err("Unsupported mode of operation %d\n", plat->mode);
76 writel(val, plat->syscfg_base + plat->syscfg_offset);
81 static void sti_dwc3_glue_init(struct sti_dwc3_glue_platdata *plat)
85 reg = readl(plat->glue_base + CLKRST_CTRL);
87 reg |= AUX_CLK_EN | EXT_CFG_RESET_N | XHCI_REVISION;
88 reg &= ~SW_PIPEW_RESET_N;
90 writel(reg, plat->glue_base + CLKRST_CTRL);
92 /* configure mux for vbus, powerpresent and bvalid signals */
93 reg = readl(plat->glue_base + USB2_VBUS_MNGMNT_SEL1);
95 reg |= SEL_OVERRIDE_VBUSVALID(USB2_VBUS_UTMIOTG) |
96 SEL_OVERRIDE_POWERPRESENT(USB2_VBUS_UTMIOTG) |
97 SEL_OVERRIDE_BVALID(USB2_VBUS_UTMIOTG);
99 writel(reg, plat->glue_base + USB2_VBUS_MNGMNT_SEL1);
101 setbits_le32(plat->glue_base + CLKRST_CTRL, SW_PIPEW_RESET_N);
104 static int sti_dwc3_glue_ofdata_to_platdata(struct udevice *dev)
106 struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev);
107 struct udevice *syscon;
108 struct regmap *regmap;
112 ret = fdtdec_get_int_array(gd->fdt_blob, dev_of_offset(dev),
113 "reg", reg, ARRAY_SIZE(reg));
115 pr_err("unable to find st,stih407-dwc3 reg property(%d)\n", ret);
119 plat->glue_base = reg[0];
120 plat->syscfg_offset = reg[2];
122 /* get corresponding syscon phandle */
123 ret = uclass_get_device_by_phandle(UCLASS_SYSCON, dev, "st,syscfg",
126 pr_err("unable to find syscon device (%d)\n", ret);
130 /* get syscfg-reg base address */
131 regmap = syscon_get_regmap(syscon);
133 pr_err("unable to find regmap\n");
136 plat->syscfg_base = regmap->ranges[0].start;
138 /* get powerdown reset */
139 ret = reset_get_by_name(dev, "powerdown", &plat->powerdown_ctl);
141 pr_err("can't get powerdown reset for %s (%d)", dev->name, ret);
145 /* get softreset reset */
146 ret = reset_get_by_name(dev, "softreset", &plat->softreset_ctl);
148 pr_err("can't get soft reset for %s (%d)", dev->name, ret);
153 static int sti_dwc3_glue_bind(struct udevice *dev)
155 struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev);
158 /* check if one subnode is present */
159 dwc3_node = fdt_first_subnode(gd->fdt_blob, dev_of_offset(dev));
160 if (dwc3_node <= 0) {
161 pr_err("Can't find subnode for %s\n", dev->name);
165 /* check if the subnode compatible string is the dwc3 one*/
166 if (fdt_node_check_compatible(gd->fdt_blob, dwc3_node,
168 pr_err("Can't find dwc3 subnode for %s\n", dev->name);
172 /* retrieve the DWC3 dual role mode */
173 plat->mode = usb_get_dr_mode(dwc3_node);
174 if (plat->mode == USB_DR_MODE_UNKNOWN)
175 /* by default set dual role mode to HOST */
176 plat->mode = USB_DR_MODE_HOST;
178 return dm_scan_fdt_dev(dev);
181 static int sti_dwc3_glue_probe(struct udevice *dev)
183 struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev);
186 /* deassert both powerdown and softreset */
187 ret = reset_deassert(&plat->powerdown_ctl);
189 pr_err("DWC3 powerdown reset deassert failed: %d", ret);
193 ret = reset_deassert(&plat->softreset_ctl);
195 pr_err("DWC3 soft reset deassert failed: %d", ret);
199 ret = sti_dwc3_glue_drd_init(plat);
203 sti_dwc3_glue_init(plat);
208 ret = reset_assert(&plat->softreset_ctl);
210 pr_err("DWC3 soft reset deassert failed: %d", ret);
215 ret = reset_assert(&plat->powerdown_ctl);
217 pr_err("DWC3 powerdown reset deassert failed: %d", ret);
222 static int sti_dwc3_glue_remove(struct udevice *dev)
224 struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev);
227 /* assert both powerdown and softreset */
228 ret = reset_assert(&plat->powerdown_ctl);
230 pr_err("DWC3 powerdown reset deassert failed: %d", ret);
234 ret = reset_assert(&plat->softreset_ctl);
236 pr_err("DWC3 soft reset deassert failed: %d", ret);
241 static const struct udevice_id sti_dwc3_glue_ids[] = {
242 { .compatible = "st,stih407-dwc3" },
246 U_BOOT_DRIVER(dwc3_sti_glue) = {
247 .name = "dwc3_sti_glue",
249 .of_match = sti_dwc3_glue_ids,
250 .ofdata_to_platdata = sti_dwc3_glue_ofdata_to_platdata,
251 .probe = sti_dwc3_glue_probe,
252 .remove = sti_dwc3_glue_remove,
253 .bind = sti_dwc3_glue_bind,
254 .platdata_auto_alloc_size = sizeof(struct sti_dwc3_glue_platdata),
255 .flags = DM_FLAG_ALLOC_PRIV_DMA,