xref: /openbmc/u-boot/drivers/usb/host/xhci-fsl.c (revision 77b93e5e)
1 /*
2  * Copyright 2015 Freescale Semiconductor, Inc.
3  *
4  * FSL USB HOST xHCI Controller
5  *
6  * Author: Ramneek Mehresh<ramneek.mehresh@freescale.com>
7  *
8  * SPDX-License-Identifier:	GPL-2.0+
9  */
10 
11 #include <common.h>
12 #include <usb.h>
13 #include <asm-generic/errno.h>
14 #include <linux/compat.h>
15 #include <linux/usb/xhci-fsl.h>
16 #include <linux/usb/dwc3.h>
17 #include "xhci.h"
18 #include <fsl_errata.h>
19 #include <fsl_usb.h>
20 
21 /* Declare global data pointer */
22 DECLARE_GLOBAL_DATA_PTR;
23 
24 static struct fsl_xhci fsl_xhci;
25 unsigned long ctr_addr[] = FSL_USB_XHCI_ADDR;
26 
27 __weak int __board_usb_init(int index, enum usb_init_type init)
28 {
29 	return 0;
30 }
31 
32 static int erratum_a008751(void)
33 {
34 #if defined(CONFIG_TARGET_LS2080AQDS) || defined(CONFIG_TARGET_LS2080ARDB)
35 	u32 __iomem *scfg = (u32 __iomem *)SCFG_BASE;
36 	writel(SCFG_USB3PRM1CR_INIT, scfg + SCFG_USB3PRM1CR / 4);
37 	return 0;
38 #endif
39 	return 1;
40 }
41 
42 static void fsl_apply_xhci_errata(void)
43 {
44 	int ret;
45 	if (has_erratum_a008751()) {
46 		ret = erratum_a008751();
47 		if (ret != 0)
48 			puts("Failed to apply erratum a008751\n");
49 	}
50 }
51 
52 static int fsl_xhci_core_init(struct fsl_xhci *fsl_xhci)
53 {
54 	int ret = 0;
55 
56 	ret = dwc3_core_init(fsl_xhci->dwc3_reg);
57 	if (ret) {
58 		debug("%s:failed to initialize core\n", __func__);
59 		return ret;
60 	}
61 
62 	/* We are hard-coding DWC3 core to Host Mode */
63 	dwc3_set_mode(fsl_xhci->dwc3_reg, DWC3_GCTL_PRTCAP_HOST);
64 
65 	/* Set GFLADJ_30MHZ as 20h as per XHCI spec default value */
66 	dwc3_set_fladj(fsl_xhci->dwc3_reg, GFLADJ_30MHZ_DEFAULT);
67 
68 	return ret;
69 }
70 
71 static int fsl_xhci_core_exit(struct fsl_xhci *fsl_xhci)
72 {
73 	/*
74 	 * Currently fsl socs do not support PHY shutdown from
75 	 * sw. But this support may be added in future socs.
76 	 */
77 	return 0;
78 }
79 
80 int xhci_hcd_init(int index, struct xhci_hccr **hccr, struct xhci_hcor **hcor)
81 {
82 	struct fsl_xhci *ctx = &fsl_xhci;
83 	int ret = 0;
84 
85 	ctx->hcd = (struct xhci_hccr *)ctr_addr[index];
86 	ctx->dwc3_reg = (struct dwc3 *)((char *)(ctx->hcd) + DWC3_REG_OFFSET);
87 
88 	ret = board_usb_init(index, USB_INIT_HOST);
89 	if (ret != 0) {
90 		puts("Failed to initialize board for USB\n");
91 		return ret;
92 	}
93 
94 	fsl_apply_xhci_errata();
95 
96 	ret = fsl_xhci_core_init(ctx);
97 	if (ret < 0) {
98 		puts("Failed to initialize xhci\n");
99 		return ret;
100 	}
101 
102 	*hccr = (struct xhci_hccr *)ctx->hcd;
103 	*hcor = (struct xhci_hcor *)((uintptr_t) *hccr
104 				+ HC_LENGTH(xhci_readl(&(*hccr)->cr_capbase)));
105 
106 	debug("fsl-xhci: init hccr %lx and hcor %lx hc_length %lx\n",
107 	      (uintptr_t)*hccr, (uintptr_t)*hcor,
108 	      (uintptr_t)HC_LENGTH(xhci_readl(&(*hccr)->cr_capbase)));
109 
110 	return ret;
111 }
112 
113 void xhci_hcd_stop(int index)
114 {
115 	struct fsl_xhci *ctx = &fsl_xhci;
116 
117 	fsl_xhci_core_exit(ctx);
118 }
119