Merge branch 'master' of git://git.denx.de/u-boot-ti

2 files changed, 330 insertions, 0 deletions

diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index c9d2ed5..1c35929 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -43,6 +43,7 @@ obj-$(CONFIG_USB_EHCI_ZYNQ) += ehci-zynq.o
 
 # xhci
 obj-$(CONFIG_USB_XHCI) += xhci.o xhci-mem.o xhci-ring.o
+obj-$(CONFIG_USB_XHCI_KEYSTONE) += xhci-keystone.o
 obj-$(CONFIG_USB_XHCI_EXYNOS) += xhci-exynos5.o
 obj-$(CONFIG_USB_XHCI_OMAP) += xhci-omap.o
 
diff --git a/drivers/usb/host/xhci-keystone.c b/drivers/usb/host/xhci-keystone.c
new file mode 100644
index 0000000..05d338f
--- /dev/null
+++ b/drivers/usb/host/xhci-keystone.c
@@ -0,0 +1,329 @@
+/*
+ * 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 <asm-generic/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 void dwc3_set_mode(struct dwc3 *dwc3_reg, u32 mode)
+{
+	clrsetbits_le32(&dwc3_reg->g_ctl,
+			DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG),
+			DWC3_GCTL_PRTCAPDIR(mode));
+}
+
+static void dwc3_core_soft_reset(struct dwc3 *dwc3_reg)
+{
+	/* Before Resetting PHY, put Core in Reset */
+	setbits_le32(&dwc3_reg->g_ctl, DWC3_GCTL_CORESOFTRESET);
+
+	/* Assert USB3 PHY reset */
+	setbits_le32(&dwc3_reg->g_usb3pipectl[0], DWC3_GUSB3PIPECTL_PHYSOFTRST);
+
+	/* Assert USB2 PHY reset */
+	setbits_le32(&dwc3_reg->g_usb2phycfg[0], DWC3_GUSB2PHYCFG_PHYSOFTRST);
+
+	mdelay(100);
+
+	/* Clear USB3 PHY reset */
+	clrbits_le32(&dwc3_reg->g_usb3pipectl[0], DWC3_GUSB3PIPECTL_PHYSOFTRST);
+
+	/* Clear USB2 PHY reset */
+	clrbits_le32(&dwc3_reg->g_usb2phycfg[0], DWC3_GUSB2PHYCFG_PHYSOFTRST);
+
+	/* After PHYs are stable we can take Core out of reset state */
+	clrbits_le32(&dwc3_reg->g_ctl, DWC3_GCTL_CORESOFTRESET);
+}
+
+static int dwc3_core_init(struct dwc3 *dwc3_reg)
+{
+	u32 revision, val;
+	unsigned long t_rst;
+	unsigned int dwc3_hwparams1;
+
+	revision = readl(&dwc3_reg->g_snpsid);
+	/* This should read as U3 followed by revision number */
+	if ((revision & DWC3_GSNPSID_MASK) != 0x55330000) {
+		puts("this is not a DesignWare USB3 DRD Core\n");
+		return -EINVAL;
+	}
+
+	/* issue device SoftReset too */
+	writel(DWC3_DCTL_CSFTRST, &dwc3_reg->d_ctl);
+
+	t_rst = get_timer(0);
+	do {
+		val = readl(&dwc3_reg->d_ctl);
+		if (!(val & DWC3_DCTL_CSFTRST))
+			break;
+		WATCHDOG_RESET();
+	} while (get_timer(t_rst) < 500);
+
+	if (val & DWC3_DCTL_CSFTRST) {
+		debug("Reset timed out\n");
+		return -2;
+	}
+
+	dwc3_core_soft_reset(dwc3_reg);
+
+	dwc3_hwparams1 = readl(&dwc3_reg->g_hwparams1);
+
+	val = readl(&dwc3_reg->g_ctl);
+	val &= ~DWC3_GCTL_SCALEDOWN_MASK;
+	val &= ~DWC3_GCTL_DISSCRAMBLE;
+	switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc3_hwparams1)) {
+	case DWC3_GHWPARAMS1_EN_PWROPT_CLK:
+		val &= ~DWC3_GCTL_DSBLCLKGTNG;
+		break;
+	default:
+		printf("No power optimization available\n");
+	}
+
+	/*
+	 * WORKAROUND: DWC3 revisions <1.90a have a bug
+	 * where the device can fail to connect at SuperSpeed
+	 * and falls back to high-speed mode which causes
+	 * the device to enter a Connect/Disconnect loop
+	 */
+	if ((revision & DWC3_REVISION_MASK) < 0x190a)
+		val |= DWC3_GCTL_U2RSTECN;
+
+	writel(val, &dwc3_reg->g_ctl);
+
+	return 0;
+}
+
+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");
+}