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40d1a31e PC |
1 | /* |
2 | * STiH407 family DWC3 specific Glue layer | |
3 | * | |
4 | * Copyright (c) 2017 | |
5 | * Patrice Chotard <patrice.chotard@st.com> | |
6 | * | |
7 | * SPDX-License-Identifier: GPL-2.0+ | |
8 | */ | |
9 | ||
10 | #include <common.h> | |
11 | #include <asm/io.h> | |
12 | #include <dm.h> | |
13 | #include <errno.h> | |
14 | #include <fdtdec.h> | |
15 | #include <libfdt.h> | |
16 | #include <dm/lists.h> | |
17 | #include <regmap.h> | |
18 | #include <reset-uclass.h> | |
19 | #include <syscon.h> | |
20 | #include <usb.h> | |
21 | ||
22 | #include <linux/usb/dwc3.h> | |
23 | #include <linux/usb/otg.h> | |
24 | #include <dwc3-sti-glue.h> | |
25 | ||
26 | DECLARE_GLOBAL_DATA_PTR; | |
27 | ||
28 | /* | |
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 | |
36 | */ | |
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; | |
44 | }; | |
45 | ||
46 | static int sti_dwc3_glue_drd_init(struct sti_dwc3_glue_platdata *plat) | |
47 | { | |
48 | unsigned long val; | |
49 | ||
50 | val = readl(plat->syscfg_base + plat->syscfg_offset); | |
51 | ||
52 | val &= USB3_CONTROL_MASK; | |
53 | ||
54 | switch (plat->mode) { | |
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); | |
60 | ||
61 | val |= USB3_DEVICE_NOT_HOST | USB3_FORCE_VBUSVALID; | |
62 | break; | |
63 | ||
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); | |
69 | ||
70 | val |= USB3_DELAY_VBUSVALID; | |
71 | break; | |
72 | ||
73 | default: | |
9b643e31 | 74 | pr_err("Unsupported mode of operation %d\n", plat->mode); |
40d1a31e PC |
75 | return -EINVAL; |
76 | } | |
77 | writel(val, plat->syscfg_base + plat->syscfg_offset); | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
82 | static void sti_dwc3_glue_init(struct sti_dwc3_glue_platdata *plat) | |
83 | { | |
84 | unsigned long reg; | |
85 | ||
86 | reg = readl(plat->glue_base + CLKRST_CTRL); | |
87 | ||
88 | reg |= AUX_CLK_EN | EXT_CFG_RESET_N | XHCI_REVISION; | |
89 | reg &= ~SW_PIPEW_RESET_N; | |
90 | ||
91 | writel(reg, plat->glue_base + CLKRST_CTRL); | |
92 | ||
93 | /* configure mux for vbus, powerpresent and bvalid signals */ | |
94 | reg = readl(plat->glue_base + USB2_VBUS_MNGMNT_SEL1); | |
95 | ||
96 | reg |= SEL_OVERRIDE_VBUSVALID(USB2_VBUS_UTMIOTG) | | |
97 | SEL_OVERRIDE_POWERPRESENT(USB2_VBUS_UTMIOTG) | | |
98 | SEL_OVERRIDE_BVALID(USB2_VBUS_UTMIOTG); | |
99 | ||
100 | writel(reg, plat->glue_base + USB2_VBUS_MNGMNT_SEL1); | |
101 | ||
102 | setbits_le32(plat->glue_base + CLKRST_CTRL, SW_PIPEW_RESET_N); | |
103 | } | |
104 | ||
105 | static int sti_dwc3_glue_ofdata_to_platdata(struct udevice *dev) | |
106 | { | |
107 | struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev); | |
108 | struct udevice *syscon; | |
109 | struct regmap *regmap; | |
110 | int ret; | |
111 | u32 reg[4]; | |
112 | ||
113 | ret = fdtdec_get_int_array(gd->fdt_blob, dev_of_offset(dev), | |
114 | "reg", reg, ARRAY_SIZE(reg)); | |
115 | if (ret) { | |
9b643e31 | 116 | pr_err("unable to find st,stih407-dwc3 reg property(%d)\n", ret); |
40d1a31e PC |
117 | return ret; |
118 | } | |
119 | ||
120 | plat->glue_base = reg[0]; | |
121 | plat->syscfg_offset = reg[2]; | |
122 | ||
123 | /* get corresponding syscon phandle */ | |
124 | ret = uclass_get_device_by_phandle(UCLASS_SYSCON, dev, "st,syscfg", | |
125 | &syscon); | |
126 | if (ret) { | |
9b643e31 | 127 | pr_err("unable to find syscon device (%d)\n", ret); |
40d1a31e PC |
128 | return ret; |
129 | } | |
130 | ||
131 | /* get syscfg-reg base address */ | |
132 | regmap = syscon_get_regmap(syscon); | |
133 | if (!regmap) { | |
9b643e31 | 134 | pr_err("unable to find regmap\n"); |
40d1a31e PC |
135 | return -ENODEV; |
136 | } | |
137 | plat->syscfg_base = regmap->base; | |
138 | ||
139 | /* get powerdown reset */ | |
140 | ret = reset_get_by_name(dev, "powerdown", &plat->powerdown_ctl); | |
141 | if (ret) { | |
9b643e31 | 142 | pr_err("can't get powerdown reset for %s (%d)", dev->name, ret); |
40d1a31e PC |
143 | return ret; |
144 | } | |
145 | ||
146 | /* get softreset reset */ | |
147 | ret = reset_get_by_name(dev, "softreset", &plat->softreset_ctl); | |
148 | if (ret) | |
9b643e31 | 149 | pr_err("can't get soft reset for %s (%d)", dev->name, ret); |
40d1a31e PC |
150 | |
151 | return ret; | |
152 | }; | |
153 | ||
154 | static int sti_dwc3_glue_bind(struct udevice *dev) | |
155 | { | |
156 | struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev); | |
157 | int dwc3_node; | |
158 | ||
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) { | |
9b643e31 | 162 | pr_err("Can't find subnode for %s\n", dev->name); |
40d1a31e PC |
163 | return -ENODEV; |
164 | } | |
165 | ||
166 | /* check if the subnode compatible string is the dwc3 one*/ | |
167 | if (fdt_node_check_compatible(gd->fdt_blob, dwc3_node, | |
168 | "snps,dwc3") != 0) { | |
9b643e31 | 169 | pr_err("Can't find dwc3 subnode for %s\n", dev->name); |
40d1a31e PC |
170 | return -ENODEV; |
171 | } | |
172 | ||
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; | |
178 | ||
179 | return dm_scan_fdt_dev(dev); | |
180 | } | |
181 | ||
182 | static int sti_dwc3_glue_probe(struct udevice *dev) | |
183 | { | |
184 | struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev); | |
185 | int ret; | |
186 | ||
187 | /* deassert both powerdown and softreset */ | |
188 | ret = reset_deassert(&plat->powerdown_ctl); | |
189 | if (ret < 0) { | |
9b643e31 | 190 | pr_err("DWC3 powerdown reset deassert failed: %d", ret); |
40d1a31e PC |
191 | return ret; |
192 | } | |
193 | ||
194 | ret = reset_deassert(&plat->softreset_ctl); | |
195 | if (ret < 0) { | |
9b643e31 | 196 | pr_err("DWC3 soft reset deassert failed: %d", ret); |
40d1a31e PC |
197 | goto softreset_err; |
198 | } | |
199 | ||
200 | ret = sti_dwc3_glue_drd_init(plat); | |
201 | if (ret) | |
202 | goto init_err; | |
203 | ||
204 | sti_dwc3_glue_init(plat); | |
205 | ||
206 | return 0; | |
207 | ||
208 | init_err: | |
209 | ret = reset_assert(&plat->softreset_ctl); | |
210 | if (ret < 0) { | |
9b643e31 | 211 | pr_err("DWC3 soft reset deassert failed: %d", ret); |
40d1a31e PC |
212 | return ret; |
213 | } | |
214 | ||
215 | softreset_err: | |
216 | ret = reset_assert(&plat->powerdown_ctl); | |
217 | if (ret < 0) | |
9b643e31 | 218 | pr_err("DWC3 powerdown reset deassert failed: %d", ret); |
40d1a31e PC |
219 | |
220 | return ret; | |
221 | } | |
222 | ||
223 | static int sti_dwc3_glue_remove(struct udevice *dev) | |
224 | { | |
225 | struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev); | |
226 | int ret; | |
227 | ||
228 | /* assert both powerdown and softreset */ | |
229 | ret = reset_assert(&plat->powerdown_ctl); | |
230 | if (ret < 0) { | |
9b643e31 | 231 | pr_err("DWC3 powerdown reset deassert failed: %d", ret); |
40d1a31e PC |
232 | return ret; |
233 | } | |
234 | ||
235 | ret = reset_assert(&plat->softreset_ctl); | |
236 | if (ret < 0) | |
9b643e31 | 237 | pr_err("DWC3 soft reset deassert failed: %d", ret); |
40d1a31e PC |
238 | |
239 | return ret; | |
240 | } | |
241 | ||
242 | static const struct udevice_id sti_dwc3_glue_ids[] = { | |
243 | { .compatible = "st,stih407-dwc3" }, | |
244 | { } | |
245 | }; | |
246 | ||
247 | U_BOOT_DRIVER(dwc3_sti_glue) = { | |
248 | .name = "dwc3_sti_glue", | |
249 | .id = UCLASS_MISC, | |
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, | |
257 | }; |