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// SPDX-License-Identifier: GPL-2.0
/*
* host.c - DesignWare USB3 DRD Controller Host Glue
*
* Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com
*
* Authors: Felipe Balbi <balbi@ti.com>,
*/
#include <linux/irq.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include "../host/xhci-port.h"
#include "../host/xhci-ext-caps.h"
#include "../host/xhci-caps.h"
#include "core.h"
#define XHCI_HCSPARAMS1 0x4
#define XHCI_PORTSC_BASE 0x400
/**
* dwc3_power_off_all_roothub_ports - Power off all Root hub ports
* @dwc: Pointer to our controller context structure
*/
static void dwc3_power_off_all_roothub_ports(struct dwc3 *dwc)
{
void __iomem *xhci_regs;
u32 op_regs_base;
int port_num;
u32 offset;
u32 reg;
int i;
/* xhci regs is not mapped yet, do it temperary here */
if (dwc->xhci_resources[0].start) {
xhci_regs = ioremap(dwc->xhci_resources[0].start, DWC3_XHCI_REGS_END);
if (!xhci_regs) {
dev_err(dwc->dev, "Failed to ioremap xhci_regs\n");
return;
}
op_regs_base = HC_LENGTH(readl(xhci_regs));
reg = readl(xhci_regs + XHCI_HCSPARAMS1);
port_num = HCS_MAX_PORTS(reg);
for (i = 1; i <= port_num; i++) {
offset = op_regs_base + XHCI_PORTSC_BASE + 0x10 * (i - 1);
reg = readl(xhci_regs + offset);
reg &= ~PORT_POWER;
writel(reg, xhci_regs + offset);
}
iounmap(xhci_regs);
} else {
dev_err(dwc->dev, "xhci base reg invalid\n");
}
}
static void dwc3_host_fill_xhci_irq_res(struct dwc3 *dwc,
int irq, char *name)
{
struct platform_device *pdev = to_platform_device(dwc->dev);
struct device_node *np = dev_of_node(&pdev->dev);
dwc->xhci_resources[1].start = irq;
dwc->xhci_resources[1].end = irq;
dwc->xhci_resources[1].flags = IORESOURCE_IRQ | irq_get_trigger_type(irq);
if (!name && np)
dwc->xhci_resources[1].name = of_node_full_name(pdev->dev.of_node);
else
dwc->xhci_resources[1].name = name;
}
static int dwc3_host_get_irq(struct dwc3 *dwc)
{
struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
int irq;
irq = platform_get_irq_byname_optional(dwc3_pdev, "host");
if (irq > 0) {
dwc3_host_fill_xhci_irq_res(dwc, irq, "host");
goto out;
}
if (irq == -EPROBE_DEFER)
goto out;
irq = platform_get_irq_byname_optional(dwc3_pdev, "dwc_usb3");
if (irq > 0) {
dwc3_host_fill_xhci_irq_res(dwc, irq, "dwc_usb3");
goto out;
}
if (irq == -EPROBE_DEFER)
goto out;
irq = platform_get_irq(dwc3_pdev, 0);
if (irq > 0)
dwc3_host_fill_xhci_irq_res(dwc, irq, NULL);
out:
return irq;
}
int dwc3_host_init(struct dwc3 *dwc)
{
struct property_entry props[5];
struct platform_device *xhci;
int ret, irq;
int prop_idx = 0;
/*
* Some platforms need to power off all Root hub ports immediately after DWC3 set to host
* mode to avoid VBUS glitch happen when xhci get reset later.
*/
dwc3_power_off_all_roothub_ports(dwc);
irq = dwc3_host_get_irq(dwc);
if (irq < 0)
return irq;
xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
if (!xhci) {
dev_err(dwc->dev, "couldn't allocate xHCI device\n");
return -ENOMEM;
}
xhci->dev.parent = dwc->dev;
dwc->xhci = xhci;
ret = platform_device_add_resources(xhci, dwc->xhci_resources,
DWC3_XHCI_RESOURCES_NUM);
if (ret) {
dev_err(dwc->dev, "couldn't add resources to xHCI device\n");
goto err;
}
memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props));
props[prop_idx++] = PROPERTY_ENTRY_BOOL("xhci-sg-trb-cache-size-quirk");
if (dwc->usb3_lpm_capable)
props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb3-lpm-capable");
if (dwc->usb2_lpm_disable)
props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb2-lpm-disable");
/**
* WORKAROUND: dwc3 revisions <=3.00a have a limitation
* where Port Disable command doesn't work.
*
* The suggested workaround is that we avoid Port Disable
* completely.
*
* This following flag tells XHCI to do just that.
*/
if (DWC3_VER_IS_WITHIN(DWC3, ANY, 300A))
props[prop_idx++] = PROPERTY_ENTRY_BOOL("quirk-broken-port-ped");
if (prop_idx) {
ret = device_create_managed_software_node(&xhci->dev, props, NULL);
if (ret) {
dev_err(dwc->dev, "failed to add properties to xHCI\n");
goto err;
}
}
ret = platform_device_add(xhci);
if (ret) {
dev_err(dwc->dev, "failed to register xHCI device\n");
goto err;
}
if (dwc->sys_wakeup) {
/* Restore wakeup setting if switched from device */
device_wakeup_enable(dwc->sysdev);
/* Pass on wakeup setting to the new xhci platform device */
device_init_wakeup(&xhci->dev, true);
}
return 0;
err:
platform_device_put(xhci);
return ret;
}
void dwc3_host_exit(struct dwc3 *dwc)
{
if (dwc->sys_wakeup)
device_init_wakeup(&dwc->xhci->dev, false);
platform_device_unregister(dwc->xhci);
dwc->xhci = NULL;
}
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