2 * STiH407 family DWC3 specific Glue layer
4 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
5 * Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
7 * SPDX-License-Identifier: GPL-2.0+
15 #include <linux/libfdt.h>
18 #include <reset-uclass.h>
22 #include <linux/usb/dwc3.h>
23 #include <linux/usb/otg.h>
24 #include <dwc3-sti-glue.h>
26 DECLARE_GLOBAL_DATA_PTR;
29 * struct sti_dwc3_glue_platdata - dwc3 STi glue driver private structure
30 * @syscfg_base: addr for the glue syscfg
31 * @glue_base: addr for the glue registers
32 * @syscfg_offset: usb syscfg control offset
33 * @powerdown_ctl: rest controller for powerdown signal
34 * @softreset_ctl: reset controller for softreset signal
35 * @mode: drd static host/device config
37 struct sti_dwc3_glue_platdata {
38 phys_addr_t syscfg_base;
39 phys_addr_t glue_base;
40 phys_addr_t syscfg_offset;
41 struct reset_ctl powerdown_ctl;
42 struct reset_ctl softreset_ctl;
43 enum usb_dr_mode mode;
46 static int sti_dwc3_glue_drd_init(struct sti_dwc3_glue_platdata *plat)
50 val = readl(plat->syscfg_base + plat->syscfg_offset);
52 val &= USB3_CONTROL_MASK;
55 case USB_DR_MODE_PERIPHERAL:
56 val &= ~(USB3_DELAY_VBUSVALID
57 | USB3_SEL_FORCE_OPMODE | USB3_FORCE_OPMODE(0x3)
58 | USB3_SEL_FORCE_DPPULLDOWN2 | USB3_FORCE_DPPULLDOWN2
59 | USB3_SEL_FORCE_DMPULLDOWN2 | USB3_FORCE_DMPULLDOWN2);
61 val |= USB3_DEVICE_NOT_HOST | USB3_FORCE_VBUSVALID;
64 case USB_DR_MODE_HOST:
65 val &= ~(USB3_DEVICE_NOT_HOST | USB3_FORCE_VBUSVALID
66 | USB3_SEL_FORCE_OPMODE | USB3_FORCE_OPMODE(0x3)
67 | USB3_SEL_FORCE_DPPULLDOWN2 | USB3_FORCE_DPPULLDOWN2
68 | USB3_SEL_FORCE_DMPULLDOWN2 | USB3_FORCE_DMPULLDOWN2);
70 val |= USB3_DELAY_VBUSVALID;
74 pr_err("Unsupported mode of operation %d\n", plat->mode);
77 writel(val, plat->syscfg_base + plat->syscfg_offset);
82 static void sti_dwc3_glue_init(struct sti_dwc3_glue_platdata *plat)
86 reg = readl(plat->glue_base + CLKRST_CTRL);
88 reg |= AUX_CLK_EN | EXT_CFG_RESET_N | XHCI_REVISION;
89 reg &= ~SW_PIPEW_RESET_N;
91 writel(reg, plat->glue_base + CLKRST_CTRL);
93 /* configure mux for vbus, powerpresent and bvalid signals */
94 reg = readl(plat->glue_base + USB2_VBUS_MNGMNT_SEL1);
96 reg |= SEL_OVERRIDE_VBUSVALID(USB2_VBUS_UTMIOTG) |
97 SEL_OVERRIDE_POWERPRESENT(USB2_VBUS_UTMIOTG) |
98 SEL_OVERRIDE_BVALID(USB2_VBUS_UTMIOTG);
100 writel(reg, plat->glue_base + USB2_VBUS_MNGMNT_SEL1);
102 setbits_le32(plat->glue_base + CLKRST_CTRL, SW_PIPEW_RESET_N);
105 static int sti_dwc3_glue_ofdata_to_platdata(struct udevice *dev)
107 struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev);
108 struct udevice *syscon;
109 struct regmap *regmap;
113 ret = fdtdec_get_int_array(gd->fdt_blob, dev_of_offset(dev),
114 "reg", reg, ARRAY_SIZE(reg));
116 pr_err("unable to find st,stih407-dwc3 reg property(%d)\n", ret);
120 plat->glue_base = reg[0];
121 plat->syscfg_offset = reg[2];
123 /* get corresponding syscon phandle */
124 ret = uclass_get_device_by_phandle(UCLASS_SYSCON, dev, "st,syscfg",
127 pr_err("unable to find syscon device (%d)\n", ret);
131 /* get syscfg-reg base address */
132 regmap = syscon_get_regmap(syscon);
134 pr_err("unable to find regmap\n");
137 plat->syscfg_base = regmap->base;
139 /* get powerdown reset */
140 ret = reset_get_by_name(dev, "powerdown", &plat->powerdown_ctl);
142 pr_err("can't get powerdown reset for %s (%d)", dev->name, ret);
146 /* get softreset reset */
147 ret = reset_get_by_name(dev, "softreset", &plat->softreset_ctl);
149 pr_err("can't get soft reset for %s (%d)", dev->name, ret);
154 static int sti_dwc3_glue_bind(struct udevice *dev)
156 struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev);
159 /* check if one subnode is present */
160 dwc3_node = fdt_first_subnode(gd->fdt_blob, dev_of_offset(dev));
161 if (dwc3_node <= 0) {
162 pr_err("Can't find subnode for %s\n", dev->name);
166 /* check if the subnode compatible string is the dwc3 one*/
167 if (fdt_node_check_compatible(gd->fdt_blob, dwc3_node,
169 pr_err("Can't find dwc3 subnode for %s\n", dev->name);
173 /* retrieve the DWC3 dual role mode */
174 plat->mode = usb_get_dr_mode(dwc3_node);
175 if (plat->mode == USB_DR_MODE_UNKNOWN)
176 /* by default set dual role mode to HOST */
177 plat->mode = USB_DR_MODE_HOST;
179 return dm_scan_fdt_dev(dev);
182 static int sti_dwc3_glue_probe(struct udevice *dev)
184 struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev);
187 /* deassert both powerdown and softreset */
188 ret = reset_deassert(&plat->powerdown_ctl);
190 pr_err("DWC3 powerdown reset deassert failed: %d", ret);
194 ret = reset_deassert(&plat->softreset_ctl);
196 pr_err("DWC3 soft reset deassert failed: %d", ret);
200 ret = sti_dwc3_glue_drd_init(plat);
204 sti_dwc3_glue_init(plat);
209 ret = reset_assert(&plat->softreset_ctl);
211 pr_err("DWC3 soft reset deassert failed: %d", ret);
216 ret = reset_assert(&plat->powerdown_ctl);
218 pr_err("DWC3 powerdown reset deassert failed: %d", ret);
223 static int sti_dwc3_glue_remove(struct udevice *dev)
225 struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev);
228 /* assert both powerdown and softreset */
229 ret = reset_assert(&plat->powerdown_ctl);
231 pr_err("DWC3 powerdown reset deassert failed: %d", ret);
235 ret = reset_assert(&plat->softreset_ctl);
237 pr_err("DWC3 soft reset deassert failed: %d", ret);
242 static const struct udevice_id sti_dwc3_glue_ids[] = {
243 { .compatible = "st,stih407-dwc3" },
247 U_BOOT_DRIVER(dwc3_sti_glue) = {
248 .name = "dwc3_sti_glue",
250 .of_match = sti_dwc3_glue_ids,
251 .ofdata_to_platdata = sti_dwc3_glue_ofdata_to_platdata,
252 .probe = sti_dwc3_glue_probe,
253 .remove = sti_dwc3_glue_remove,
254 .bind = sti_dwc3_glue_bind,
255 .platdata_auto_alloc_size = sizeof(struct sti_dwc3_glue_platdata),
256 .flags = DM_FLAG_ALLOC_PRIV_DMA,