1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2017 Marek Vasut <marek.vasut@gmail.com>
4 *
5 * Renesas RCar USB HOST xHCI Controller
6 */
7
8 #include <common.h>
9 #include <clk.h>
10 #include <dm.h>
11 #include <fdtdec.h>
12 #include <usb.h>
13 #include <wait_bit.h>
14
15 #include "xhci.h"
16 #include "xhci-rcar-r8a779x_usb3_v3.h"
17
18 /* Register Offset */
19 #define RCAR_USB3_DL_CTRL 0x250 /* FW Download Control & Status */
20 #define RCAR_USB3_FW_DATA0 0x258 /* FW Data0 */
21
22 /* Register Settings */
23 /* FW Download Control & Status */
24 #define RCAR_USB3_DL_CTRL_ENABLE BIT(0)
25 #define RCAR_USB3_DL_CTRL_FW_SUCCESS BIT(4)
26 #define RCAR_USB3_DL_CTRL_FW_SET_DATA0 BIT(8)
27
28 struct rcar_xhci_platdata {
29 fdt_addr_t hcd_base;
30 struct clk clk;
31 };
32
33 /**
34 * Contains pointers to register base addresses
35 * for the usb controller.
36 */
37 struct rcar_xhci {
38 struct xhci_ctrl ctrl; /* Needs to come first in this struct! */
39 struct usb_platdata usb_plat;
40 struct xhci_hccr *hcd;
41 };
42
xhci_rcar_download_fw(struct rcar_xhci * ctx,const u32 * fw_data,const size_t fw_array_size)43 static int xhci_rcar_download_fw(struct rcar_xhci *ctx, const u32 *fw_data,
44 const size_t fw_array_size)
45 {
46 void __iomem *regs = (void __iomem *)ctx->hcd;
47 int i, ret;
48
49 /* Download R-Car USB3.0 firmware */
50 setbits_le32(regs + RCAR_USB3_DL_CTRL, RCAR_USB3_DL_CTRL_ENABLE);
51
52 for (i = 0; i < fw_array_size; i++) {
53 writel(fw_data[i], regs + RCAR_USB3_FW_DATA0);
54 setbits_le32(regs + RCAR_USB3_DL_CTRL,
55 RCAR_USB3_DL_CTRL_FW_SET_DATA0);
56
57 ret = wait_for_bit_le32(regs + RCAR_USB3_DL_CTRL,
58 RCAR_USB3_DL_CTRL_FW_SET_DATA0, false,
59 10, false);
60 if (ret)
61 break;
62 }
63
64 clrbits_le32(regs + RCAR_USB3_DL_CTRL, RCAR_USB3_DL_CTRL_ENABLE);
65
66 ret = wait_for_bit_le32(regs + RCAR_USB3_DL_CTRL,
67 RCAR_USB3_DL_CTRL_FW_SUCCESS, true,
68 10, false);
69
70 return ret;
71 }
72
xhci_rcar_probe(struct udevice * dev)73 static int xhci_rcar_probe(struct udevice *dev)
74 {
75 struct rcar_xhci_platdata *plat = dev_get_platdata(dev);
76 struct rcar_xhci *ctx = dev_get_priv(dev);
77 struct xhci_hcor *hcor;
78 int len, ret;
79
80 ret = clk_get_by_index(dev, 0, &plat->clk);
81 if (ret < 0) {
82 dev_err(dev, "Failed to get USB3 clock\n");
83 return ret;
84 }
85
86 ret = clk_enable(&plat->clk);
87 if (ret) {
88 dev_err(dev, "Failed to enable USB3 clock\n");
89 goto err_clk;
90 }
91
92 ctx->hcd = (struct xhci_hccr *)plat->hcd_base;
93 len = HC_LENGTH(xhci_readl(&ctx->hcd->cr_capbase));
94 hcor = (struct xhci_hcor *)((uintptr_t)ctx->hcd + len);
95
96 ret = xhci_rcar_download_fw(ctx, firmware_r8a779x_usb3_v3,
97 ARRAY_SIZE(firmware_r8a779x_usb3_v3));
98 if (ret) {
99 dev_err(dev, "Failed to download firmware\n");
100 goto err_fw;
101 }
102
103 ret = xhci_register(dev, ctx->hcd, hcor);
104 if (ret) {
105 dev_err(dev, "Failed to register xHCI\n");
106 goto err_fw;
107 }
108
109 return 0;
110
111 err_fw:
112 clk_disable(&plat->clk);
113 err_clk:
114 clk_free(&plat->clk);
115 return ret;
116 }
117
xhci_rcar_deregister(struct udevice * dev)118 static int xhci_rcar_deregister(struct udevice *dev)
119 {
120 int ret;
121 struct rcar_xhci_platdata *plat = dev_get_platdata(dev);
122
123 ret = xhci_deregister(dev);
124
125 clk_disable(&plat->clk);
126 clk_free(&plat->clk);
127
128 return ret;
129 }
130
xhci_rcar_ofdata_to_platdata(struct udevice * dev)131 static int xhci_rcar_ofdata_to_platdata(struct udevice *dev)
132 {
133 struct rcar_xhci_platdata *plat = dev_get_platdata(dev);
134
135 plat->hcd_base = devfdt_get_addr(dev);
136 if (plat->hcd_base == FDT_ADDR_T_NONE) {
137 debug("Can't get the XHCI register base address\n");
138 return -ENXIO;
139 }
140
141 return 0;
142 }
143
144 static const struct udevice_id xhci_rcar_ids[] = {
145 { .compatible = "renesas,xhci-r8a7795" },
146 { .compatible = "renesas,xhci-r8a7796" },
147 { .compatible = "renesas,xhci-r8a77965" },
148 { }
149 };
150
151 U_BOOT_DRIVER(usb_xhci) = {
152 .name = "xhci_rcar",
153 .id = UCLASS_USB,
154 .probe = xhci_rcar_probe,
155 .remove = xhci_rcar_deregister,
156 .ops = &xhci_usb_ops,
157 .of_match = xhci_rcar_ids,
158 .ofdata_to_platdata = xhci_rcar_ofdata_to_platdata,
159 .platdata_auto_alloc_size = sizeof(struct rcar_xhci_platdata),
160 .priv_auto_alloc_size = sizeof(struct rcar_xhci),
161 .flags = DM_FLAG_ALLOC_PRIV_DMA,
162 };
163