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/*
* Copyright (C) 2015 Panasonic Corporation
* Copyright (C) 2015 Socionext Inc.
* Author: Masahiro Yamada <yamada.masahiro@socionext.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <linux/err.h>
#include <usb.h>
#include <fdtdec.h>
#include "xhci.h"
static int get_uniphier_xhci_base(int index, struct xhci_hccr **base)
{
DECLARE_GLOBAL_DATA_PTR;
int node_list[2];
fdt_addr_t addr;
int count;
count = fdtdec_find_aliases_for_id(gd->fdt_blob, "usb",
COMPAT_SOCIONEXT_XHCI, node_list,
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ARRAY_SIZE(node_list));
if (index >= count)
return -ENODEV;
addr = fdtdec_get_addr(gd->fdt_blob, node_list[index], "reg");
if (addr == FDT_ADDR_T_NONE)
return -ENODEV;
*base = (struct xhci_hccr *)addr;
return 0;
}
#define USB3_RST_CTRL 0x00100040
#define IOMMU_RST_N (1 << 5)
#define LINK_RST_N (1 << 4)
static void uniphier_xhci_reset(void __iomem *base, int on)
{
u32 tmp;
tmp = readl(base + USB3_RST_CTRL);
if (on)
tmp &= ~(IOMMU_RST_N | LINK_RST_N);
else
tmp |= IOMMU_RST_N | LINK_RST_N;
writel(tmp, base + USB3_RST_CTRL);
}
int xhci_hcd_init(int index, struct xhci_hccr **hccr, struct xhci_hcor **hcor)
{
int ret;
struct xhci_hccr *cr;
struct xhci_hcor *or;
ret = get_uniphier_xhci_base(index, &cr);
if (ret < 0)
return ret;
uniphier_xhci_reset(cr, 0);
or = (void *)cr + HC_LENGTH(xhci_readl(&cr->cr_capbase));
*hccr = cr;
*hcor = or;
return 0;
}
void xhci_hcd_stop(int index)
{
int ret;
struct xhci_hccr *cr;
ret = get_uniphier_xhci_base(index, &cr);
if (ret < 0)
return;
uniphier_xhci_reset(cr, 1);
}