1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * SAMSUNG EXYNOS5 USB HOST XHCI Controller
4 *
5 * Copyright (C) 2012 Samsung Electronics Co.Ltd
6 * Vivek Gautam <gautam.vivek@samsung.com>
7 * Vikas Sajjan <vikas.sajjan@samsung.com>
8 */
9
10 /*
11 * This file is a conglomeration for DWC3-init sequence and further
12 * exynos5 specific PHY-init sequence.
13 */
14
15 #include <common.h>
16 #include <dm.h>
17 #include <fdtdec.h>
18 #include <linux/libfdt.h>
19 #include <malloc.h>
20 #include <usb.h>
21 #include <watchdog.h>
22 #include <asm/arch/cpu.h>
23 #include <asm/arch/power.h>
24 #include <asm/arch/xhci-exynos.h>
25 #include <asm/gpio.h>
26 #include <linux/errno.h>
27 #include <linux/compat.h>
28 #include <linux/usb/dwc3.h>
29
30 #include "xhci.h"
31
32 /* Declare global data pointer */
33 DECLARE_GLOBAL_DATA_PTR;
34
35 struct exynos_xhci_platdata {
36 fdt_addr_t hcd_base;
37 fdt_addr_t phy_base;
38 struct gpio_desc vbus_gpio;
39 };
40
41 /**
42 * Contains pointers to register base addresses
43 * for the usb controller.
44 */
45 struct exynos_xhci {
46 struct usb_platdata usb_plat;
47 struct xhci_ctrl ctrl;
48 struct exynos_usb3_phy *usb3_phy;
49 struct xhci_hccr *hcd;
50 struct dwc3 *dwc3_reg;
51 };
52
xhci_usb_ofdata_to_platdata(struct udevice * dev)53 static int xhci_usb_ofdata_to_platdata(struct udevice *dev)
54 {
55 struct exynos_xhci_platdata *plat = dev_get_platdata(dev);
56 const void *blob = gd->fdt_blob;
57 unsigned int node;
58 int depth;
59
60 /*
61 * Get the base address for XHCI controller from the device node
62 */
63 plat->hcd_base = devfdt_get_addr(dev);
64 if (plat->hcd_base == FDT_ADDR_T_NONE) {
65 debug("Can't get the XHCI register base address\n");
66 return -ENXIO;
67 }
68
69 depth = 0;
70 node = fdtdec_next_compatible_subnode(blob, dev_of_offset(dev),
71 COMPAT_SAMSUNG_EXYNOS5_USB3_PHY, &depth);
72 if (node <= 0) {
73 debug("XHCI: Can't get device node for usb3-phy controller\n");
74 return -ENODEV;
75 }
76
77 /*
78 * Get the base address for usbphy from the device node
79 */
80 plat->phy_base = fdtdec_get_addr(blob, node, "reg");
81 if (plat->phy_base == FDT_ADDR_T_NONE) {
82 debug("Can't get the usbphy register address\n");
83 return -ENXIO;
84 }
85
86 /* Vbus gpio */
87 gpio_request_by_name(dev, "samsung,vbus-gpio", 0,
88 &plat->vbus_gpio, GPIOD_IS_OUT);
89
90 return 0;
91 }
92
exynos5_usb3_phy_init(struct exynos_usb3_phy * phy)93 static void exynos5_usb3_phy_init(struct exynos_usb3_phy *phy)
94 {
95 u32 reg;
96
97 /* enabling usb_drd phy */
98 set_usbdrd_phy_ctrl(POWER_USB_DRD_PHY_CTRL_EN);
99
100 /* Reset USB 3.0 PHY */
101 writel(0x0, &phy->phy_reg0);
102
103 clrbits_le32(&phy->phy_param0,
104 /* Select PHY CLK source */
105 PHYPARAM0_REF_USE_PAD |
106 /* Set Loss-of-Signal Detector sensitivity */
107 PHYPARAM0_REF_LOSLEVEL_MASK);
108 setbits_le32(&phy->phy_param0, PHYPARAM0_REF_LOSLEVEL);
109
110 writel(0x0, &phy->phy_resume);
111
112 /*
113 * Setting the Frame length Adj value[6:1] to default 0x20
114 * See xHCI 1.0 spec, 5.2.4
115 */
116 setbits_le32(&phy->link_system,
117 LINKSYSTEM_XHCI_VERSION_CONTROL |
118 LINKSYSTEM_FLADJ(0x20));
119
120 /* Set Tx De-Emphasis level */
121 clrbits_le32(&phy->phy_param1, PHYPARAM1_PCS_TXDEEMPH_MASK);
122 setbits_le32(&phy->phy_param1, PHYPARAM1_PCS_TXDEEMPH);
123
124 setbits_le32(&phy->phy_batchg, PHYBATCHG_UTMI_CLKSEL);
125
126 /* PHYTEST POWERDOWN Control */
127 clrbits_le32(&phy->phy_test,
128 PHYTEST_POWERDOWN_SSP |
129 PHYTEST_POWERDOWN_HSP);
130
131 /* UTMI Power Control */
132 writel(PHYUTMI_OTGDISABLE, &phy->phy_utmi);
133
134 /* Use core clock from main PLL */
135 reg = PHYCLKRST_REFCLKSEL_EXT_REFCLK |
136 /* Default 24Mhz crystal clock */
137 PHYCLKRST_FSEL(FSEL_CLKSEL_24M) |
138 PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF |
139 PHYCLKRST_SSC_REFCLKSEL(0x88) |
140 /* Force PortReset of PHY */
141 PHYCLKRST_PORTRESET |
142 /* Digital power supply in normal operating mode */
143 PHYCLKRST_RETENABLEN |
144 /* Enable ref clock for SS function */
145 PHYCLKRST_REF_SSP_EN |
146 /* Enable spread spectrum */
147 PHYCLKRST_SSC_EN |
148 /* Power down HS Bias and PLL blocks in suspend mode */
149 PHYCLKRST_COMMONONN;
150
151 writel(reg, &phy->phy_clk_rst);
152
153 /* giving time to Phy clock to settle before resetting */
154 udelay(10);
155
156 reg &= ~PHYCLKRST_PORTRESET;
157 writel(reg, &phy->phy_clk_rst);
158 }
159
exynos5_usb3_phy_exit(struct exynos_usb3_phy * phy)160 static void exynos5_usb3_phy_exit(struct exynos_usb3_phy *phy)
161 {
162 setbits_le32(&phy->phy_utmi,
163 PHYUTMI_OTGDISABLE |
164 PHYUTMI_FORCESUSPEND |
165 PHYUTMI_FORCESLEEP);
166
167 clrbits_le32(&phy->phy_clk_rst,
168 PHYCLKRST_REF_SSP_EN |
169 PHYCLKRST_SSC_EN |
170 PHYCLKRST_COMMONONN);
171
172 /* PHYTEST POWERDOWN Control to remove leakage current */
173 setbits_le32(&phy->phy_test,
174 PHYTEST_POWERDOWN_SSP |
175 PHYTEST_POWERDOWN_HSP);
176
177 /* disabling usb_drd phy */
178 set_usbdrd_phy_ctrl(POWER_USB_DRD_PHY_CTRL_DISABLE);
179 }
180
exynos_xhci_core_init(struct exynos_xhci * exynos)181 static int exynos_xhci_core_init(struct exynos_xhci *exynos)
182 {
183 int ret;
184
185 exynos5_usb3_phy_init(exynos->usb3_phy);
186
187 ret = dwc3_core_init(exynos->dwc3_reg);
188 if (ret) {
189 debug("failed to initialize core\n");
190 return -EINVAL;
191 }
192
193 /* We are hard-coding DWC3 core to Host Mode */
194 dwc3_set_mode(exynos->dwc3_reg, DWC3_GCTL_PRTCAP_HOST);
195
196 return 0;
197 }
198
exynos_xhci_core_exit(struct exynos_xhci * exynos)199 static void exynos_xhci_core_exit(struct exynos_xhci *exynos)
200 {
201 exynos5_usb3_phy_exit(exynos->usb3_phy);
202 }
203
xhci_usb_probe(struct udevice * dev)204 static int xhci_usb_probe(struct udevice *dev)
205 {
206 struct exynos_xhci_platdata *plat = dev_get_platdata(dev);
207 struct exynos_xhci *ctx = dev_get_priv(dev);
208 struct xhci_hcor *hcor;
209 int ret;
210
211 ctx->hcd = (struct xhci_hccr *)plat->hcd_base;
212 ctx->usb3_phy = (struct exynos_usb3_phy *)plat->phy_base;
213 ctx->dwc3_reg = (struct dwc3 *)((char *)(ctx->hcd) + DWC3_REG_OFFSET);
214 hcor = (struct xhci_hcor *)((uint32_t)ctx->hcd +
215 HC_LENGTH(xhci_readl(&ctx->hcd->cr_capbase)));
216
217 /* setup the Vbus gpio here */
218 if (dm_gpio_is_valid(&plat->vbus_gpio))
219 dm_gpio_set_value(&plat->vbus_gpio, 1);
220
221 ret = exynos_xhci_core_init(ctx);
222 if (ret) {
223 puts("XHCI: failed to initialize controller\n");
224 return -EINVAL;
225 }
226
227 return xhci_register(dev, ctx->hcd, hcor);
228 }
229
xhci_usb_remove(struct udevice * dev)230 static int xhci_usb_remove(struct udevice *dev)
231 {
232 struct exynos_xhci *ctx = dev_get_priv(dev);
233 int ret;
234
235 ret = xhci_deregister(dev);
236 if (ret)
237 return ret;
238 exynos_xhci_core_exit(ctx);
239
240 return 0;
241 }
242
243 static const struct udevice_id xhci_usb_ids[] = {
244 { .compatible = "samsung,exynos5250-xhci" },
245 { }
246 };
247
248 U_BOOT_DRIVER(usb_xhci) = {
249 .name = "xhci_exynos",
250 .id = UCLASS_USB,
251 .of_match = xhci_usb_ids,
252 .ofdata_to_platdata = xhci_usb_ofdata_to_platdata,
253 .probe = xhci_usb_probe,
254 .remove = xhci_usb_remove,
255 .ops = &xhci_usb_ops,
256 .platdata_auto_alloc_size = sizeof(struct exynos_xhci_platdata),
257 .priv_auto_alloc_size = sizeof(struct exynos_xhci),
258 .flags = DM_FLAG_ALLOC_PRIV_DMA,
259 };
260