u-boot/drivers/usb/host/xhci-keystone.c

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/*
* USB 3.0 DRD Controller
*
* (C) Copyright 2012-2014
* Texas Instruments Incorporated, <www.ti.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <watchdog.h>
#include <usb.h>
#include <asm/arch/psc_defs.h>
#include <asm/io.h>
#include <linux/usb/dwc3.h>
#include <asm/arch/xhci-keystone.h>
#include <linux/errno.h>
#include <linux/list.h>
#include "xhci.h"
struct kdwc3_irq_regs {
u32 revision; /* 0x000 */
u32 rsvd0[3];
u32 sysconfig; /* 0x010 */
u32 rsvd1[1];
u32 irq_eoi;
u32 rsvd2[1];
struct {
u32 raw_status;
u32 status;
u32 enable_set;
u32 enable_clr;
} irqs[16];
};
struct keystone_xhci {
struct xhci_hccr *hcd;
struct dwc3 *dwc3_reg;
struct xhci_hcor *hcor;
struct kdwc3_irq_regs *usbss;
struct keystone_xhci_phy *phy;
};
struct keystone_xhci keystone;
static void keystone_xhci_phy_set(struct keystone_xhci_phy *phy)
{
u32 val;
/*
* VBUSVLDEXTSEL has a default value of 1 in BootCfg but shouldn't.
* It should always be cleared because our USB PHY has an onchip VBUS
* analog comparator.
*/
val = readl(&phy->phy_clock);
/* quit selecting the vbusvldextsel by default! */
val &= ~USB3_PHY_OTG_VBUSVLDECTSEL;
writel(val, &phy->phy_clock);
}
static void keystone_xhci_phy_unset(struct keystone_xhci_phy *phy)
{
u32 val;
/* Disable the PHY REFCLK clock gate */
val = readl(&phy->phy_clock);
val &= ~USB3_PHY_REF_SSP_EN;
writel(val, &phy->phy_clock);
}
static int keystone_xhci_core_init(struct dwc3 *dwc3_reg)
{
int ret;
ret = dwc3_core_init(dwc3_reg);
if (ret) {
debug("failed to initialize core\n");
return -EINVAL;
}
/* We are hard-coding DWC3 core to Host Mode */
dwc3_set_mode(dwc3_reg, DWC3_GCTL_PRTCAP_HOST);
return 0;
}
int xhci_hcd_init(int index,
struct xhci_hccr **ret_hccr, struct xhci_hcor **ret_hcor)
{
u32 val;
int ret;
struct xhci_hccr *hcd;
struct xhci_hcor *hcor;
struct kdwc3_irq_regs *usbss;
struct keystone_xhci_phy *phy;
usbss = (struct kdwc3_irq_regs *)CONFIG_USB_SS_BASE;
phy = (struct keystone_xhci_phy *)CONFIG_DEV_USB_PHY_BASE;
/* Enable the PHY REFCLK clock gate with phy_ref_ssp_en = 1 */
val = readl(&(phy->phy_clock));
val |= USB3_PHY_REF_SSP_EN;
writel(val, &phy->phy_clock);
mdelay(100);
/* Release USB from reset */
ret = psc_enable_module(KS2_LPSC_USB);
if (ret) {
puts("Cannot enable USB module");
return -1;
}
mdelay(100);
/* Initialize usb phy */
keystone_xhci_phy_set(phy);
/* soft reset usbss */
writel(1, &usbss->sysconfig);
while (readl(&usbss->sysconfig) & 1)
;
val = readl(&usbss->revision);
debug("usbss revision %x\n", val);
/* Initialize usb core */
hcd = (struct xhci_hccr *)CONFIG_USB_HOST_XHCI_BASE;
keystone.dwc3_reg = (struct dwc3 *)(CONFIG_USB_HOST_XHCI_BASE +
DWC3_REG_OFFSET);
keystone_xhci_core_init(keystone.dwc3_reg);
/* set register addresses */
hcor = (struct xhci_hcor *)((uint32_t)hcd +
HC_LENGTH(readl(&hcd->cr_capbase)));
debug("Keystone2-xhci: init hccr %08x and hcor %08x hc_length %d\n",
(u32)hcd, (u32)hcor,
(u32)HC_LENGTH(xhci_readl(&hcd->cr_capbase)));
keystone.usbss = usbss;
keystone.phy = phy;
keystone.hcd = hcd;
keystone.hcor = hcor;
*ret_hccr = hcd;
*ret_hcor = hcor;
return 0;
}
static int keystone_xhci_phy_suspend(void)
{
int loop_cnt = 0;
struct xhci_hcor *hcor;
uint32_t *portsc_1 = NULL;
uint32_t *portsc_2 = NULL;
u32 val, usb2_pls, usb3_pls, event_q;
struct dwc3 *dwc3_reg = keystone.dwc3_reg;
/* set register addresses */
hcor = keystone.hcor;
/* Bypass Scrambling and Set Shorter Training sequence for simulation */
val = DWC3_GCTL_PWRDNSCALE(0x4b0) | DWC3_GCTL_PRTCAPDIR(0x2);
writel(val, &dwc3_reg->g_ctl);
/* GUSB2PHYCFG */
val = readl(&dwc3_reg->g_usb2phycfg[0]);
/* assert bit 6 (SusPhy) */
val |= DWC3_GUSB2PHYCFG_SUSPHY;
writel(val, &dwc3_reg->g_usb2phycfg[0]);
/* GUSB3PIPECTL */
val = readl(&dwc3_reg->g_usb3pipectl[0]);
/*
* assert bit 29 to allow PHY to go to suspend when idle
* and cause the USB3 SS PHY to enter suspend mode
*/
val |= (BIT(29) | DWC3_GUSB3PIPECTL_SUSPHY);
writel(val, &dwc3_reg->g_usb3pipectl[0]);
/*
* Steps necessary to allow controller to suspend even when
* VBUS is HIGH:
* - Init DCFG[2:0] (DevSpd) to: 1=FS
* - Init GEVNTADR0 to point to an eventQ
* - Init GEVNTSIZ0 to 0x0100 to specify the size of the eventQ
* - Init DCTL::Run_nStop = 1
*/
writel(0x00020001, &dwc3_reg->d_cfg);
/* TODO: local2global( (Uint32) eventQ )? */
writel((u32)&event_q, &dwc3_reg->g_evnt_buf[0].g_evntadrlo);
writel(0, &dwc3_reg->g_evnt_buf[0].g_evntadrhi);
writel(0x4, &dwc3_reg->g_evnt_buf[0].g_evntsiz);
/* Run */
writel(DWC3_DCTL_RUN_STOP, &dwc3_reg->d_ctl);
mdelay(100);
/* Wait for USB2 & USB3 PORTSC::PortLinkState to indicate suspend */
portsc_1 = (uint32_t *)(&hcor->portregs[0].or_portsc);
portsc_2 = (uint32_t *)(&hcor->portregs[1].or_portsc);
usb2_pls = 0;
usb3_pls = 0;
do {
++loop_cnt;
usb2_pls = (readl(portsc_1) & PORT_PLS_MASK) >> 5;
usb3_pls = (readl(portsc_2) & PORT_PLS_MASK) >> 5;
} while (((usb2_pls != 0x4) || (usb3_pls != 0x4)) && loop_cnt < 1000);
if (usb2_pls != 0x4 || usb3_pls != 0x4) {
debug("USB suspend failed - PLS USB2=%02x, USB3=%02x\n",
usb2_pls, usb3_pls);
return -1;
}
debug("USB2 and USB3 PLS - Disabled, loop_cnt=%d\n", loop_cnt);
return 0;
}
void xhci_hcd_stop(int index)
{
/* Disable USB */
if (keystone_xhci_phy_suspend())
return;
if (psc_disable_module(KS2_LPSC_USB)) {
debug("PSC disable module USB failed!\n");
return;
}
/* Disable PHY */
keystone_xhci_phy_unset(keystone.phy);
/* memset(&keystone, 0, sizeof(struct keystone_xhci)); */
debug("xhci_hcd_stop OK.\n");
}