mirror of
https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
240 lines
5.6 KiB
C
240 lines
5.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* USB 3.0 DRD Controller
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*
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* (C) Copyright 2012-2014
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* Texas Instruments Incorporated, <www.ti.com>
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*/
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#include <common.h>
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#include <watchdog.h>
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#include <usb.h>
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#include <asm/arch/psc_defs.h>
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#include <asm/io.h>
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#include <linux/usb/dwc3.h>
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#include <asm/arch/xhci-keystone.h>
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#include <linux/errno.h>
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#include <linux/list.h>
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#include "xhci.h"
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struct kdwc3_irq_regs {
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u32 revision; /* 0x000 */
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u32 rsvd0[3];
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u32 sysconfig; /* 0x010 */
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u32 rsvd1[1];
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u32 irq_eoi;
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u32 rsvd2[1];
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struct {
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u32 raw_status;
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u32 status;
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u32 enable_set;
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u32 enable_clr;
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} irqs[16];
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};
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struct keystone_xhci {
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struct xhci_hccr *hcd;
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struct dwc3 *dwc3_reg;
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struct xhci_hcor *hcor;
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struct kdwc3_irq_regs *usbss;
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struct keystone_xhci_phy *phy;
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};
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struct keystone_xhci keystone;
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static void keystone_xhci_phy_set(struct keystone_xhci_phy *phy)
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{
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u32 val;
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/*
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* VBUSVLDEXTSEL has a default value of 1 in BootCfg but shouldn't.
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* It should always be cleared because our USB PHY has an onchip VBUS
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* analog comparator.
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*/
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val = readl(&phy->phy_clock);
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/* quit selecting the vbusvldextsel by default! */
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val &= ~USB3_PHY_OTG_VBUSVLDECTSEL;
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writel(val, &phy->phy_clock);
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}
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static void keystone_xhci_phy_unset(struct keystone_xhci_phy *phy)
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{
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u32 val;
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/* Disable the PHY REFCLK clock gate */
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val = readl(&phy->phy_clock);
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val &= ~USB3_PHY_REF_SSP_EN;
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writel(val, &phy->phy_clock);
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}
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static int keystone_xhci_core_init(struct dwc3 *dwc3_reg)
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{
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int ret;
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ret = dwc3_core_init(dwc3_reg);
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if (ret) {
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debug("failed to initialize core\n");
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return -EINVAL;
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}
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/* We are hard-coding DWC3 core to Host Mode */
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dwc3_set_mode(dwc3_reg, DWC3_GCTL_PRTCAP_HOST);
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return 0;
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}
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int xhci_hcd_init(int index,
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struct xhci_hccr **ret_hccr, struct xhci_hcor **ret_hcor)
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{
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u32 val;
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int ret;
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struct xhci_hccr *hcd;
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struct xhci_hcor *hcor;
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struct kdwc3_irq_regs *usbss;
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struct keystone_xhci_phy *phy;
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usbss = (struct kdwc3_irq_regs *)CONFIG_USB_SS_BASE;
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phy = (struct keystone_xhci_phy *)CONFIG_DEV_USB_PHY_BASE;
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/* Enable the PHY REFCLK clock gate with phy_ref_ssp_en = 1 */
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val = readl(&(phy->phy_clock));
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val |= USB3_PHY_REF_SSP_EN;
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writel(val, &phy->phy_clock);
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mdelay(100);
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/* Release USB from reset */
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ret = psc_enable_module(KS2_LPSC_USB);
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if (ret) {
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puts("Cannot enable USB module");
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return -1;
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}
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mdelay(100);
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/* Initialize usb phy */
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keystone_xhci_phy_set(phy);
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/* soft reset usbss */
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writel(1, &usbss->sysconfig);
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while (readl(&usbss->sysconfig) & 1)
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;
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val = readl(&usbss->revision);
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debug("usbss revision %x\n", val);
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/* Initialize usb core */
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hcd = (struct xhci_hccr *)CONFIG_USB_HOST_XHCI_BASE;
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keystone.dwc3_reg = (struct dwc3 *)(CONFIG_USB_HOST_XHCI_BASE +
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DWC3_REG_OFFSET);
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keystone_xhci_core_init(keystone.dwc3_reg);
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/* set register addresses */
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hcor = (struct xhci_hcor *)((uint32_t)hcd +
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HC_LENGTH(readl(&hcd->cr_capbase)));
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debug("Keystone2-xhci: init hccr %08x and hcor %08x hc_length %d\n",
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(u32)hcd, (u32)hcor,
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(u32)HC_LENGTH(xhci_readl(&hcd->cr_capbase)));
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keystone.usbss = usbss;
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keystone.phy = phy;
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keystone.hcd = hcd;
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keystone.hcor = hcor;
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*ret_hccr = hcd;
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*ret_hcor = hcor;
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return 0;
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}
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static int keystone_xhci_phy_suspend(void)
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{
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int loop_cnt = 0;
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struct xhci_hcor *hcor;
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uint32_t *portsc_1 = NULL;
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uint32_t *portsc_2 = NULL;
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u32 val, usb2_pls, usb3_pls, event_q;
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struct dwc3 *dwc3_reg = keystone.dwc3_reg;
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/* set register addresses */
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hcor = keystone.hcor;
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/* Bypass Scrambling and Set Shorter Training sequence for simulation */
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val = DWC3_GCTL_PWRDNSCALE(0x4b0) | DWC3_GCTL_PRTCAPDIR(0x2);
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writel(val, &dwc3_reg->g_ctl);
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/* GUSB2PHYCFG */
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val = readl(&dwc3_reg->g_usb2phycfg[0]);
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/* assert bit 6 (SusPhy) */
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val |= DWC3_GUSB2PHYCFG_SUSPHY;
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writel(val, &dwc3_reg->g_usb2phycfg[0]);
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/* GUSB3PIPECTL */
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val = readl(&dwc3_reg->g_usb3pipectl[0]);
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/*
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* assert bit 29 to allow PHY to go to suspend when idle
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* and cause the USB3 SS PHY to enter suspend mode
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*/
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val |= (BIT(29) | DWC3_GUSB3PIPECTL_SUSPHY);
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writel(val, &dwc3_reg->g_usb3pipectl[0]);
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/*
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* Steps necessary to allow controller to suspend even when
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* VBUS is HIGH:
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* - Init DCFG[2:0] (DevSpd) to: 1=FS
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* - Init GEVNTADR0 to point to an eventQ
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* - Init GEVNTSIZ0 to 0x0100 to specify the size of the eventQ
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* - Init DCTL::Run_nStop = 1
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*/
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writel(0x00020001, &dwc3_reg->d_cfg);
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/* TODO: local2global( (Uint32) eventQ )? */
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writel((u32)&event_q, &dwc3_reg->g_evnt_buf[0].g_evntadrlo);
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writel(0, &dwc3_reg->g_evnt_buf[0].g_evntadrhi);
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writel(0x4, &dwc3_reg->g_evnt_buf[0].g_evntsiz);
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/* Run */
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writel(DWC3_DCTL_RUN_STOP, &dwc3_reg->d_ctl);
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mdelay(100);
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/* Wait for USB2 & USB3 PORTSC::PortLinkState to indicate suspend */
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portsc_1 = (uint32_t *)(&hcor->portregs[0].or_portsc);
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portsc_2 = (uint32_t *)(&hcor->portregs[1].or_portsc);
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usb2_pls = 0;
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usb3_pls = 0;
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do {
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++loop_cnt;
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usb2_pls = (readl(portsc_1) & PORT_PLS_MASK) >> 5;
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usb3_pls = (readl(portsc_2) & PORT_PLS_MASK) >> 5;
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} while (((usb2_pls != 0x4) || (usb3_pls != 0x4)) && loop_cnt < 1000);
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if (usb2_pls != 0x4 || usb3_pls != 0x4) {
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debug("USB suspend failed - PLS USB2=%02x, USB3=%02x\n",
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usb2_pls, usb3_pls);
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return -1;
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}
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debug("USB2 and USB3 PLS - Disabled, loop_cnt=%d\n", loop_cnt);
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return 0;
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}
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void xhci_hcd_stop(int index)
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{
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/* Disable USB */
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if (keystone_xhci_phy_suspend())
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return;
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if (psc_disable_module(KS2_LPSC_USB)) {
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debug("PSC disable module USB failed!\n");
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return;
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}
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/* Disable PHY */
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keystone_xhci_phy_unset(keystone.phy);
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/* memset(&keystone, 0, sizeof(struct keystone_xhci)); */
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debug("xhci_hcd_stop OK.\n");
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}
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