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 <log.h>
13 #include <malloc.h>
14 #include <usb.h>
15 #include <wait_bit.h>
16 #include <dm/device_compat.h>
17 #include <linux/bitops.h>
18
19 #include <usb/xhci.h>
20 #include "xhci-rcar-r8a779x_usb3_v3.h"
21
22 /* Register Offset */
23 #define RCAR_USB3_DL_CTRL 0x250 /* FW Download Control & Status */
24 #define RCAR_USB3_FW_DATA0 0x258 /* FW Data0 */
25
26 /* Register Settings */
27 /* FW Download Control & Status */
28 #define RCAR_USB3_DL_CTRL_ENABLE BIT(0)
29 #define RCAR_USB3_DL_CTRL_FW_SUCCESS BIT(4)
30 #define RCAR_USB3_DL_CTRL_FW_SET_DATA0 BIT(8)
31
32 struct rcar_xhci_plat {
33 fdt_addr_t hcd_base;
34 struct clk clk;
35 };
36
37 /**
38 * Contains pointers to register base addresses
39 * for the usb controller.
40 */
41 struct rcar_xhci {
42 struct xhci_ctrl ctrl; /* Needs to come first in this struct! */
43 struct usb_plat usb_plat;
44 struct xhci_hccr *hcd;
45 };
46
xhci_rcar_download_fw(struct rcar_xhci * ctx,const u32 * fw_data,const size_t fw_array_size)47 static int xhci_rcar_download_fw(struct rcar_xhci *ctx, const u32 *fw_data,
48 const size_t fw_array_size)
49 {
50 void __iomem *regs = (void __iomem *)ctx->hcd;
51 int i, ret;
52
53 /* Download R-Car USB3.0 firmware */
54 setbits_le32(regs + RCAR_USB3_DL_CTRL, RCAR_USB3_DL_CTRL_ENABLE);
55
56 for (i = 0; i < fw_array_size; i++) {
57 writel(fw_data[i], regs + RCAR_USB3_FW_DATA0);
58 setbits_le32(regs + RCAR_USB3_DL_CTRL,
59 RCAR_USB3_DL_CTRL_FW_SET_DATA0);
60
61 ret = wait_for_bit_le32(regs + RCAR_USB3_DL_CTRL,
62 RCAR_USB3_DL_CTRL_FW_SET_DATA0, false,
63 10, false);
64 if (ret)
65 break;
66 }
67
68 clrbits_le32(regs + RCAR_USB3_DL_CTRL, RCAR_USB3_DL_CTRL_ENABLE);
69
70 ret = wait_for_bit_le32(regs + RCAR_USB3_DL_CTRL,
71 RCAR_USB3_DL_CTRL_FW_SUCCESS, true,
72 10, false);
73
74 return ret;
75 }
76
xhci_rcar_probe(struct udevice * dev)77 static int xhci_rcar_probe(struct udevice *dev)
78 {
79 struct rcar_xhci_plat *plat = dev_get_plat(dev);
80 struct rcar_xhci *ctx = dev_get_priv(dev);
81 struct xhci_hcor *hcor;
82 int len, ret;
83
84 ret = clk_get_by_index(dev, 0, &plat->clk);
85 if (ret < 0) {
86 dev_err(dev, "Failed to get USB3 clock\n");
87 return ret;
88 }
89
90 ret = clk_enable(&plat->clk);
91 if (ret) {
92 dev_err(dev, "Failed to enable USB3 clock\n");
93 goto err_clk;
94 }
95
96 ctx->hcd = (struct xhci_hccr *)plat->hcd_base;
97 len = HC_LENGTH(xhci_readl(&ctx->hcd->cr_capbase));
98 hcor = (struct xhci_hcor *)((uintptr_t)ctx->hcd + len);
99
100 ret = xhci_rcar_download_fw(ctx, firmware_r8a779x_usb3_v3,
101 ARRAY_SIZE(firmware_r8a779x_usb3_v3));
102 if (ret) {
103 dev_err(dev, "Failed to download firmware\n");
104 goto err_fw;
105 }
106
107 ret = xhci_register(dev, ctx->hcd, hcor);
108 if (ret) {
109 dev_err(dev, "Failed to register xHCI\n");
110 goto err_fw;
111 }
112
113 return 0;
114
115 err_fw:
116 clk_disable(&plat->clk);
117 err_clk:
118 clk_free(&plat->clk);
119 return ret;
120 }
121
xhci_rcar_deregister(struct udevice * dev)122 static int xhci_rcar_deregister(struct udevice *dev)
123 {
124 int ret;
125 struct rcar_xhci_plat *plat = dev_get_plat(dev);
126
127 ret = xhci_deregister(dev);
128
129 clk_disable(&plat->clk);
130 clk_free(&plat->clk);
131
132 return ret;
133 }
134
xhci_rcar_of_to_plat(struct udevice * dev)135 static int xhci_rcar_of_to_plat(struct udevice *dev)
136 {
137 struct rcar_xhci_plat *plat = dev_get_plat(dev);
138
139 plat->hcd_base = dev_read_addr(dev);
140 if (plat->hcd_base == FDT_ADDR_T_NONE) {
141 debug("Can't get the XHCI register base address\n");
142 return -ENXIO;
143 }
144
145 return 0;
146 }
147
148 static const struct udevice_id xhci_rcar_ids[] = {
149 { .compatible = "renesas,rcar-gen3-xhci" },
150 { .compatible = "renesas,xhci-r8a7795" },
151 { .compatible = "renesas,xhci-r8a7796" },
152 { .compatible = "renesas,xhci-r8a77965" },
153 { }
154 };
155
156 U_BOOT_DRIVER(usb_xhci) = {
157 .name = "xhci_rcar",
158 .id = UCLASS_USB,
159 .probe = xhci_rcar_probe,
160 .remove = xhci_rcar_deregister,
161 .ops = &xhci_usb_ops,
162 .of_match = xhci_rcar_ids,
163 .of_to_plat = xhci_rcar_of_to_plat,
164 .plat_auto = sizeof(struct rcar_xhci_plat),
165 .priv_auto = sizeof(struct rcar_xhci),
166 .flags = DM_FLAG_ALLOC_PRIV_DMA,
167 };
168